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Title:
NOZZLE COMBUSTION SHIELD AND SEALING MEMBER WITH IMPROVED HEAT TRANSFER CAPABILITIES
Document Type and Number:
WIPO Patent Application WO/2017/027741
Kind Code:
A1
Abstract:
An injector combustion shield assembly comprising a combustion shield including a first portion and a second portion, the first portion positionable around a body of a fuel injector and the second portion positionable around a nozzle element of the fuel injector; a first sealing member positionable intermediate the nozzle element and the combustion shield; a second sealing member positionable intermediate an annular wall of a nozzle receiving bore and the combustion shield; and wherein the first portion of the combustion shield includes a surface structured to contact the body of the fuel injector and contact an annular wall of an injector receiving bore when the combustion shield is positioned within the injector receiving bore such that heat is conducted to lower temperature parts of the injector receiving bore.

Inventors:
PETERS, Lester, L. (8543 West Dam Road, Columbus, IN, 47201, US)
BUCHANAN, David, L. (2022 West County Road 800 South, Westport, IN, 47283, US)
LUTZ, Timothy, P. (1900 Mckinley Avenue, Columbus, IN, 47201, US)
SNYDER, David, B. (1366 Fiesta Drive, Franklin, IN, 46131, US)
WEILER, Derek (2140 N 550 W, North Vernon, IN, 47265, US)
WESTERFELD, Clayton, Ross (3819 Taylor Road, Columbus, IN, 47203, US)
COLIN, Julie, Anne (2278 Cameron Drive, Columbus, IN, 47203, US)
AKINOLA, Akintomide, K. (2981 Branch Street, Whiteland, IN, 46184, US)
BARDAKJY, Scott, R. (1697 Anthony Drive, Columbus, IN, 47201, US)
SHETTIGAR, Satyajith, P. (616 Stone Gate Drive, Columbus, IN, 47201, US)
Application Number:
US2016/046622
Publication Date:
February 16, 2017
Filing Date:
August 11, 2016
Export Citation:
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Assignee:
CUMMINS INC. (500 Jackson Street, Columbus, IN, 47201, US)
International Classes:
F02M53/04; F02F11/00; F02M53/00; F02M61/00; F02M61/14; F16J15/00
Foreign References:
US20020157648A12002-10-31
US5967121A1999-10-19
US20110067653A12011-03-24
US4829965A1989-05-16
US3334617A1967-08-08
Attorney, Agent or Firm:
BANAKAR, Kapil, U. (Faegre Baker Daniels LLP, 300 North Meridian Street Suite 270, Indianapolis IN, 46204, US)
Download PDF:
Claims:
CLAIMS

1. An apparatus comprising:

a combustion shield including a first portion and a second portion, the first portion positionable around a body of a fuel injector and the second portion positionable around a nozzle element of the fuel injector;

a first sealing member positionable intermediate the nozzle element and the combustion shield;

a second sealing member positionable intermediate an annular wall of a nozzle receiving bore and the combustion shield; and

wherein the first portion of the combustion shield includes a surface structured to contact the body of the fuel injector and contact an annular wall of an injector receiving bore when the combustion shield is positioned within the injector receiving bore such that heat is conducted to lower temperature parts of the injector receiving bore.

2. The apparatus of claim 1, wherein the second portion of the combustion shield terminates longitudinally above a fuel injector orifice of the injector receiving bore.

3. The apparatus of claim 1, wherein the first portion of the combustion shield includes a plurality of fingers structured to contact the body of the fuel injector and the annular wall of the injector receiving bore.

4. The apparatus of claim 1, wherein the first portion of the combustion shield includes a plurality of slots configured to receive a plurality of raised portions of a third sealing member positionable intermediate an annular wall of the injector receiving bore and the combustion shield.

5. The apparatus of claim 1, wherein the combustion shield and the second sealing member are fused together.

6. The apparatus of claim 1, wherein the second portion of the combustion shield includes an annular recess configured to receive the second sealing member.

7. The apparatus of claim 1, wherein the first portion of the combustion shield includes a plurality of spring clips structured to contact the fuel injector.

8. An apparatus comprising:

a combustion shield including a first portion, a second portion configured to engage with a nozzle of a fuel injector positioned in an injector receiving bore, a sealing member positioned intermediate the first portion and the injector receiving bore, and a retainer positioned intermediate the first portion and the sealing member;

wherein a portion of the second portion of the combustion shield engages the sealing member;

wherein a lower portion of the first portion engages with the retainer; and wherein the second portion is positioned longitudinally above a fuel injector orifice of the injector receiving bore.

9. The apparatus of claim 8, further comprising:

a coolant passage extending to the injector receiving bore that provides a fluid from a fluid jacket to the injector receiving bore such that the fluid can improve heat transfer from combustion gas to lower temperature parts of the injector receiving bore.

10. The apparatus of claim 8, wherein the fuel injector is positioned within the injector receiving bore and a portion of the fuel injector rests on the second portion of the combustion shield such that a first seal is formed at the interface of the fuel injector and the second portion and a second seal is formed at the interface of the second portion and the sealing member.

11. The apparatus of claim 9, further comprising:

a first O-ring positioned between an upper portion of the first portion of the combustion shield and the injector receiving bore, the first O-ring configured to provide a seal preventing drain fuel and the fluid from mixing,

a second O-ring positioned between the second portion of the combustion shield and the retainer, the second O-ring configured to provide a seal keeping drain fuel away from the nozzle; and

a third O-ring positioned between the second portion of the combustion shield and the sealing member.

12. The apparatus of claim 11, wherein the first O-ring, the second O-ring, and the third O- ring are made of FKM as defined by ASTM D1418.

13. The apparatus of claim 8, wherein the first portion is made of pure copper.

14. The apparatus of claim 8, wherein the second portion is made of a copper alloy.

15. A method of assembly comprising:

installing a first portion of a combustion shield onto a fuel injector;

coupling a sealing member to the first portion;

inserting a second portion of the combustion shield into a receiving bore;

positioning a first O-ring around the sealing member; and

installing the fuel injector into the receiving bore with the first portion, the sealing member, and the first O-ring coupled to the fuel injector.

16. The method of claim 15, wherein coupling a sealing member to the first portion includes a second O-ring positioned between the sealing member and the first portion.

17. The method of claim 16, further comprising installing a third O-ring onto an upper portion of the second portion of the combustion shield, the second portion of the combustion shield with the third O-ring is inserted into the injector bore.

18. The method of claim 17, further comprising coupling a retainer with the second portion of the combustion shield.

19. The method of claim 18, wherein the retainer is press fit onto the second portion of the combustion shield.

20. The method of claim 18, wherein the installing the fuel injector into the receiving bore includes engaging the fuel injector with the retainer and the second portion.

21. The method of claim 15, wherein the inserting a second portion into a receiving bore further includes frictionally engaging a dam of the second portion with the receiving bore.

22. The method of claim 21, wherein inserting a second portion into a receiving bore further includes aligning a first member of the second portion with a second member of the receiving bore.

AMENDED CLAIMS

received by the International Bureau on 27 December 2016 (27.12.16)

1. An apparatus comprising:

a combustion shield including a first portion and a second portion, the first portion positionable around a body of a fuel injector and the second portion positionable around a nozzle element of the fuel injector;

a first sealing member positionable intermediate the nozzle element and the combustion shield;

a second sealing member positionable intermediate an annular wall of a nozzle receiving bore and the combustion shield; and

wherein the first portion of the combustion shield includes a surface structured to contact the body of the fuel injector and contact an annular wall of an injector receiving bore when the combustion shield is positioned within the injector receiving bore such that heat is conducted to lower temperature parts of the injector receiving bore.

2. The apparatus of claim 1, wherein the second portion of the combustion shield terminates longitudinally above a fuel injector orifice of the injector receiving bore.

3. The apparatus of claim 1, wherein the first portion of the combustion shield includes a plurality of fingers structured to contact the body of the fuel injector and the annular wall of the injector receiving bore.

4. The apparatus of claim 1, wherein the first portion of the combustion shield includes a plurality of slots configured to receive a plurality of raised portions of a third sealing member positionable intermediate an annular wall of the injector receiving bore and the combustion shield.

5. The apparatus of claim 1, wherein the combustion shield and the second sealing member are fused together.

AMENDED SHEET (ARTICLE 19)

6. The apparatus of claim 1, wherein the second portion of the combustion shield includes an annular recess configured to receive the second sealing member.

7. The apparatus of claim 1, wherein the first portion of the combustion shield includes a plurality of spring clips structured to contact the fuel injector.

8. An apparatus comprising:

a combustion shield including a first portion, a second portion configured to engage with a nozzle of a fuel injector positioned in an injector receiving bore, a sealing member positioned intermediate the first portion and the injector receiving bore, and a retainer positioned intermediate the first portion and the sealing member;

wherein a portion of the second portion of the combustion shield engages the sealing member;

wherein the first portion contacts an annular wall of the injector receiving bore, and a lower portion of the first portion engages with the retainer; and

wherein the second portion is positioned longitudinally above a fuel injector orifice of the injector receiving bore.

9. The apparatus of claim 8, further comprising:

a coolant passage extending to the injector receiving bore that provides a fluid from a fluid jacket to the injector receiving bore such that the fluid can improve heat transfer from combustion gas to lower temperature parts of the injector receiving bore.

10. The apparatus of claim 8, wherein the fuel injector is positioned within the injector receiving bore and a portion of the fuel injector rests on the second portion of the combustion shield such that a first seal is formed at the interface of the fuel injector and the second portion and a second seal is formed at the interface of the second portion and the sealing member.

11. The apparatus of claim 9, further comprising:

AMENDED SHEET (ARTICLE 19) a first O-ring positioned between an upper portion of the first portion of the combustion shield and the injector receiving bore, the first O-ring configured to provide a seal preventing drain fuel and the fluid from mixing,

a second O-ring positioned between the second portion of the combustion shield and the retainer, the second O-ring configured to provide a seal keeping drain fuel away from the nozzle; and

a third O-ring positioned between the second portion of the combustion shield and the sealing member.

12. The apparatus of claim 11, wherein the first O-ring, the second O-ring, and the third 0- ring are made of FKM as defined by ASTM D1418.

13. The apparatus of claim 8, wherein the first portion is made of pure copper.

14. The apparatus of claim 8, wherein the second portion is made of a copper alloy.

15. A method of assembly comprising:

installing a first portion of a combustion shield onto a fuel injector;

coupling a sealing member to the first portion;

inserting a second portion of the combustion shield into a receiving bore;

positioning a first O-ring around the sealing member; and

installing the fuel injector into the receiving bore with the first portion, the sealing member, and the first O-ring coupled to the fuel injector;

wherein installing the fuel injector into the receiving bore comprises placing the first portion of the combustion shield into engagement with the second portion of the combustion shield.

16. The method of claim 15, wherein coupling a sealing member to the first portion includes a second O-ring positioned between the sealing member and the first portion.

AMENDED SHEET (ARTICLE 19)

17. The method of claim 16, further comprising installing a third O-ring onto an upper portion of the second portion of the combustion shield, the second portion of the combustion shield with the third O-ring is inserted into the injector bore.

18. The method of claim 17, further comprising coupling a retainer with the second portion of the combustion shield.

19. The method of claim 18, wherein the retainer is press fit onto the second portion of the combustion shield.

20. The method of claim 18, wherein the installing the fuel injector into the receiving bore includes engaging the fuel injector with the retainer and the second portion.

21. The method of claim 15, wherein the inserting a second portion into a receiving bore further includes frictionally engaging a dam of the second portion with the receiving bore.

22. The method of claim 21 , wherein inserting a second portion into a receiving bore further includes aligning a first member of the second portion with a second member of the receiving bore.

AMENDED SHEET (ARTICLE 19)

Description:
NOZZLE COMBUSTION SHIELD AND SEALING MEMBER WITH IMPROVED

HEAT TRANSFER CAPABILITIES

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to U.S. Provisional Patent Application Serial No.

62/204,408, filed August 12, 2015, the disclosure of which is hereby expressly incorporated by reference herein in its entirety.

FIELD OF THE DISCLOSURE

[0002] The present disclosure generally relates to fuel injector seal assemblies for internal combustion engines and more particularly, to nozzle combustion shields and sealing members with improved heat transfer capabilities.

BACKGROUND OF THE DISCLOSURE

[0003] An internal combustion engine includes an engine body and engine components, such as a fuel injector, spark plug, and pressure sensor mounted on the engine body. The engine body also includes one or more engine coolant passages containing engine coolant in close proximity to the engine components. For example, engines often require a separate injector sleeve insert to separate coolant from the fuel injector. Many designs for injector sleeve insertion exist with varying degrees of robustness against coolant, fuel, and combustion gas, leaks, particularly at the end closest to the combustion event, i.e. the combustion chamber. The high local temperatures make elastomeric sealing a challenge. Also, high mechanical and thermal load cycling may create high stress at the sleeve/head seal interface. An internal combustion engine with a fuel injector may require a combustion seal to keep combustion gases in a combustion chamber of the engine from flowing into a passage surrounding the fuel injector. One challenge with such seals is that they may be inefficient at transporting or transferring heat away from a nozzle housing of the fuel injector, or if such seals transport heat away from a distal end of a nozzle element housing, the seals may have insufficient strength to resist yielding, which may ultimately permit leaks. SUMMARY OF THE DISCLOSURE

[0004] According to one embodiment, the present disclosure provides an apparatus comprising: a combustion shield including a first portion and a second portion, the first portion positionable around a body of a fuel injector and the second portion positionable around a nozzle element of the fuel injector; a first sealing member positionable intermediate the nozzle element and the combustion shield; a second sealing member positionable intermediate an annular wall of a nozzle receiving bore and the combustion shield; and wherein the first portion of the combustion shield includes a surface structured to contact the body of the fuel injector and contact an annular wall of an injector receiving bore when the combustion shield is positioned within the injector receiving bore such that heat is conducted to lower temperature parts of the injector receiving bore.

[0005] According to another embodiment, the present disclosure provides an apparatus comprising: a combustion shield including a first portion, a second portion configured to engage with a nozzle of a fuel injector positioned in an injector receiving bore, a sealing member positioned intermediate the first portion and the injector receiving bore, and a retainer positioned intermediate the first portion and the sealing member; wherein a portion of the second portion of the combustion shield engages the sealing member; wherein a lower portion of the first portion engages with the retainer; and wherein the second portion is positioned longitudinally above a fuel injector orifice of the injector receiving bore.

[0006] According to another embodiment, the present disclosure provides a method of assembly comprising: installing a first portion of a combustion shield onto a fuel injector; coupling a sealing member to the first portion; inserting a second portion of the combustion shield into a receiving bore; positioning a first O-ring around the sealing member; and installing the fuel injector into the receiving bore with the first portion, the sealing member, and the first O-ring coupled to the fuel injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The above-mentioned and other features of this disclosure and the manner of obtaining them will become more apparent and the disclosure itself will be better understood by reference to the following description of embodiments of the present disclosure taken in conjunction with the accompanying drawings, wherein:

[0008] FIG. 1 shows cross-sectional views of an injector combustion shield assembly installed on a fuel injector within an engine mounting bore.

[0009] FIG. 1A shows a cross-sectional view of the injector combustion shield of FIG. 1 installed on the fuel injector of FIG. 1.

[00010] FIG. 2 shows a cross-sectional view of an injector combustion shield assembly including a combustion shield and injector seal according to an embodiment of the present disclosure.

[00011] FIG. 2A shows a perspective view of the combustion shield of the injector combustion shield assembly of FIG. 2 according to an embodiment of the present disclosure.

[00012] FIG. 2B shows a perspective view of the injector seal of the combustion shield assembly of FIG. 2 according to an embodiment of the present disclosure.

[00013] FIG. 3 is an enlarged cross-sectional view of the injector combustion shield assembly of FIG. 2.

[00014] FIG. 4 shows a cross-sectional view of an injector combustion seal assembly according to an embodiment of the present disclosure.

[00015] FIG. 4A shows a cross-sectional view of a combustion shield of the injector combustion seal assembly of FIG. 4 according to an embodiment of the present disclosure.

[00016] FIGS. 5 A and 5B show cross-sectional views of injector combustion shields according to an embodiment of the present disclosure. [00017] FIG. 6 shows a perspective view of an injector combustion shield according to an embodiment of the present disclosure.

[00018] FIG. 6A shows a cross-sectional view of the injector combustion shield of FIG. 6

FIG. 6 according to an embodiment of the present disclosure.

[00019] FIG. 6B shows a perspective view of the injector combustion shield of FIG. 6 according to an embodiment of the present disclosure.

[00020] FIG. 7 shows a cross-sectional view of a fuel injector nozzle and engine head according to an embodiment of the present disclosure.

[00021] FIG. 7A shows an enlarged cross-sectional view of a portion of the fuel injector nozzle and engine head of FIG. 7 including an applied thermal barrier coating according to an embodiment of the present disclosure.

[00022] FIG. 7B shows an enlarged cross-sectional view of a portion of the fuel injector nozzle and engine head of FIG. 7 according to an embodiment of the present disclosure.

[00023] FIG. 7C shows a perspective view of the nozzle of the fuel injector of FIG. 7 including a thermal barrier coating according to an embodiment of the present disclosure.

[00024] FIG. 8 shows a cross-sectional view of an injector combustion shield assembly including a combustion shield according to an embodiment of the present disclosure.

[00025] FIGS. 9A and 9B show enlarged cross-sectional views of an upper portion and lower portion of the combustion shield of FIG. 8.

[00026] FIG. 10 shows a perspective view of an injector bore including coolant inlets according to an embodiment of the present disclosure.

[00027] FIG. 11 shows a perspective view of a sleeve of the combustion shield of FIG. 8. [00028] FIG. 12 shows a flow chart for a method of assembling the combustion shield of FIG. 8.

DETAILED DESCRIPTION OF EMBODIMENTS

[00029] The embodiments disclosed herein are not intended to be exhaustive or to limit the disclosure to the precise forms disclosed in the following detailed description. Rather, the embodiments were chosen and described so that others skilled in the art may utilize their teachings.

[00030] Referring initially to FIGs. 1 and 1A, cross-sectional views of an injector combustion shield assembly 100 installed on a fuel injector 122 within an engine mounting/receiving bore 118 (hereinafter "bore 118") are shown. Fuel injector 122 generally includes nozzle 106, needle 108, fuel cavity 110, and injector body 11 1. In various embodiments of the present disclosure, fuel injector 122 may further include one or more components which are known by a person of ordinary skill in the art of fuel injector design and operation. In the illustrative embodiment of FIGs. 1 and 1A, injector combustion shield assembly 100 (hereinafter "assembly 100") generally includes combustion shield 102, first sealing member 104, and second sealing member 116. In one embodiment, shield 102 generally includes a first portion/section 124 and a second portion/section 126. First section 124 may include a plurality of fingers 114 structured to contact an annular exterior section/surface of fuel injector 122 as well as contact an inner annular wall of bore 118. Combustion shield 102 is generally structured to conduct heat from and/or adjacent to nozzle 106 longitudinally upwardly toward fingers 114 and ultimately toward the sections of bore 118 that are in contact with fingers 114 of shield 102. The heat adjacent nozzle 106 that is conducted by shield 102 results from combustion gases that are generated based on ignition and burning of atomized fuel injected by fuel injector 122 into a cylinder of an internal combustion engine.

[00031] Assembly 100 is dimensioned for positioning in bore 118 formed in an exemplary cylinder head of an engine body or head 120 of an internal combustion engine. In various embodiments and as discussed briefly above, bore 118 includes an interior annular wall/surface. Additionally, in these embodiments, injector 122 includes a peripheral exterior surface 134 that is adjacent to and in close proximity with the annular wall of bore 118 when fuel injector 122 is positioned in bore 118. The interior wall of bore 118 and exterior surface 134 of injector 122 forms an annular gap or passage 136 that extends radially between injector 122 and bore 118. In one embodiment, coolant, cooled water, or cooled low pressure fuel may be added within gap or passage 136 where the cooled fluid flows in contact with combustion shield 102 to absorb heat from shield 102 and facilitate cooling of nozzle 106. The use of such cooling fluid to reduce nozzle tip temperature is disclosed in co-pending U.S. Patent Application No. 62/204,254, filed August 12, 2015, entitled "FUEL COOLED INJECTOR TIP" (docket number CI-14-0614-01- US-e) the entire disclosure of which being expressly incorporated herein by reference. In one embodiment, bore 118 may also include a nozzle receiving bore 117 structured for receiving an exemplary fuel injector nozzle such as nozzle 106 of fuel injector 122. Receiving bore 117 also includes an annular wall 119 and nozzle 106 includes a peripheral exterior surface 138 that is adjacent to and in close proximity with annular wall 119 when nozzle 106 is positioned in receiving bore 117. In the illustrative embodiment of FIGs. 1 and 1A, first section 124 of combustion shield 102 is positionable in bore 118 while second section 126 of shield 102 is positionable in receiving bore 117. In one embodiment, second portion 126 includes an annular groove 128 structured to receive second sealing member 116. In one embodiment, sealing member 116 may be an O-ring seal, a gasket seal, or any other equivalent sealing mechanism generally formed of a ring with a circular cross section and structured to provide a sealing interface.

[00032] As known by one of ordinary skill, engine head 120 may generally include one or more cylinders (not shown), and a piston (not shown) positioned for reciprocal movement in each cylinder. During longitudinal movement of the piston toward fuel injector 122, injector 122 injects fuel into a combustion chamber (not shown) formed by the portion of the cylinder that extends from the piston to the cylinder head. As injector 122 injects fuel into the combustion chamber and as the piston moves longitudinally toward fuel injector 122, combustion of the injected fuel occurs and heated combustion gases are produced in response to the combustion. In one embodiment, second sealing member 116 seals injector bore 118 and injector body 111 from the high temperature combustion gases that occur in response to ignition of the fuel injected by injector 122. In another embodiment, sealing member 104 also seals injector bore 118 and injector body 111 from the aforementioned high temperature combustion gases.

[00033] Assembly 100 is a thermally conductive or heat transfer assembly fabricated or formed of one or more materials having various degrees and/or ranges of thermal conductivity. In one embodiment, combustion shield 102 is fabricated from a Copper alloy material having a thermal conductivity of approximately 401 Watts per meter-Centigrade (W/m-C). In an alternate embodiment, combustion shield 102 is made from gray cast iron having a thermal conductivity of approximately 52 Watts per meter-Centigrade (W/m-C), steel having a thermal conductivity of approximately 42 Watts per meter-Centigrade (W/m-C) (e.g., H13 nozzle), or phosphor bronze having a thermal conductivity of approximately 40 Watts per meter-Centri grade (W/m-C) (e.g., phosphor bronze C51000). In one aspect of this embodiment, sealing member 104 is fabricated from a Stainless Steel material having a thermal conductivity of approximately 60.5 (W/m-C). The combined thermal conductivity of shield 102 and sealing member 104 cooperate to conduct or transfer combustion gas heat from the nozzle end of injector 122 up into low temperature sections of bore 118. Exemplary low temperature sections of bore 118 include the sections of bore 118 that are in contact with fingers 114 of combustion shield 102. In various embodiments of the present disclosure, engine head 120 may be part of an exemplary fluid/water-cooled internal combustion engine comprising one or more fluid/water jackets 112 having cooled fluid, water or low pressure fuel flowing throughout. Hence, as shown in the illustrative embodiment of FIGs. 1 and 1A, additional low temperature sections of bore 118 generally include portions of bore 118 that are in closest proximity to fluid jacket 112 such as bore low temperature section 132.

[00034] Sealing member 104 is designed and manufactured to carry a fuel injector clamp load to maintain structural integrity when clamped between fuel injector 122 and the annular wall of bore 118. Thus, assembly 100 beneficially combines combustion sealing with an enhanced ability to conduct, transfer, or wick heat away from nozzle 106 in order to maintain the reliability and sustained usability of fuel injector 122. Sealing member 104 is designed of a metal that is able to withstand the fuel injector clamp loads transmitted by injector 122 unto sealing member 104 and then unto the annular wall of bore 118. In one embodiment, combustion shield 102 is fabricated of a metal having a higher thermal conductivity than the material used to produce sealing member 104. Additionally, the contact between sealing member 104, combustion shield 102, fuel injector 122, and bore 118 is optimized to transfer heat from nozzle 106 of fuel injector 122 upwardly to a cooler portion of fuel injector 122.

[00035] In the illustrative embodiment of FIGs. 1 and 1A, sealing member 104 is positioned longitudinally between injector body 111 and an interior annular wall of combustion shield 102. Assembly 100 provides a metal to metal combustion seal with contact pressures high enough to yield sealing member 104 into sealing contact against the interior annular wall of combustion shield 102. In one embodiment, the contact pressure may be induced and maintained by the force from fuel injector 122 being mounted and secured within bore 118 by an exemplary fuel injector securement system. That is, the injector clamping or securing load for securing fuel injector 122 in bore 118 is generally relied upon to apply a sealing force to sealing member 104. In one embodiment, injector mounting bore 118 and combustion shield 102 cooperate to form a sealing interface/surface 130 positioned at an angle relative to needle 108 thereby providing a conical sealing surface. Sealing member 104 includes angled surface 131 that contacts sealing surface 130 when sealing member 104 is positioned longitudinally intermediate injector body 111 and combustion shield 102. Hence, the contact between sealing member 104 and surface 130 forms a fluid seal. In one embodiment, sealing member angled surface 131 and sealing interface 130 are each approximately at an angle of about 44 degrees with respect to needle 108.

[00036] Sealing member 104 is generally circular in shape and includes an interior ring diameter 142 formed by an annular interior ring wall portion and an angled exterior wall portion 133. In one embodiment, sealing member 104 may be formed of a single unitary piece. Although, in various alternative embodiments sealing member 104 may be formed of multiple pieces, a single unitary piece is easier to form and assemble as opposed to two or more pieces. As noted above, in one embodiment, sealing member 104 may be formed of a stainless steel material, which may be an SAE 303 stainless steel. In addition to the other benefits provided by sealing member 104, the material of sealing member 104 provides a thermal barrier to combustion heat from an exemplary combustion chamber. Sealing member 104 includes an end surface 135 that is sized and dimensioned to form a fluid seal with an end section of fuel injector 122. In one embodiment, end surface 135 is a flat planar surface that abuts or contacts an end section of fuel injector 122. This end section of injector 122 likewise has a flat, planar surface that mates with end surface 135 of sealing member 104.

[00037] In one embodiment of the present disclosure, combustion shield 102 is a component that is fabricated distinctly or formed separately from sealing member 104. As shown in the illustrative embodiment of FIGs. 1 and 1A, first section 124 generally has at least a first diameter 140 and second section 126 has a second diameter 141 that is smaller than first diameter 140. In one embodiment, combustion shield 102 may be formed of a single unitary piece. Although in various alternative embodiments combustion shield 102 may be formed of multiple pieces, a single unitary piece is easier to form and assemble as opposed to two or more pieces. In the embodiment of FIGs. 1 and 1A, combustion shield 102 is a conical load carrying copper heat transfer shield. The conical design allows combustion shield 102 to be received and secured within bore 118 such that sealing member 104 can cooperate with injector 122 to form a robust fluid seal and carry the clamping load induced by injector 122. In one embodiment, second section 126 of combustion shield 102 may provide retention onto nozzle 106 via, for example, a press fit that also allows heat to leave the combustion chamber and move upwardly longitudinally toward low temperature section 132. During installation of assembly 100 and fuel injector 122 into bore 118, when nozzle 106 is positioned within second section 126, an inner surface of second section 126 is directly adjacent to, mates with, abuts, or faces a peripheral outer surface of nozzle 106. In one embodiment, sealing member 104 may be slip-fit into an area of first section 124 having a diameter 144 that is less than diameter 140 but greater than diameter 141 of second section 126. Thus, because of the slip-fit installation, sealing member 104 is easily removable and replaceable during a fuel injector 122 service event.

[00038] Referring now to the illustrative embodiments of FIGs. 2-2B and FIG. 3, a cross- sectional view of an injector combustion shield assembly 200 (hereinafter "assembly 200") including perspective views of a combustion shield 202 and a first sealing member 204 are shown. In the illustrative embodiment of FIGs. 2-2B, although fuel injector 222 may differ slightly from fuel injector 122 in apparent design, descriptions of assembly 200 may include one or more elements of injector 222 and engine head 120 that are the same as described in the illustrative embodiment of FIGs. 1 and 1A and thus these elements will be numbered the same. As such, to the extent that additional descriptions are not provided, reference should be made to the above mentioned description of any elements of the embodiment of FIGs. 2-2B that are the same as the embodiment of FIGs. 1 and 1A.

[00039] In the illustrative embodiments of FIGs. 2-2B and FIG. 3, assembly 200 generally includes combustion shield 202, first sealing member 204, and second sealing member 116. In one embodiment, shield 202 generally includes a first portion/section 210 and a second portion/section 212. Sealing member 204 includes a plurality of raised members or portions 205 and first section 210 includes a plurality of slots or openings 203 wherein each slot/opening is structured to receive a single raised portion 205 of sealing member 204. First section 210 generally contacts an annular exterior section of fuel injector 222 as well as contacts an inner annular wall of bore 118. Much like combustion shield 102 of FIGs. 1 and 1A, combustion shield 202 is generally structured to conduct heat from and/or adjacent to nozzle 106 longitudinally upwardly toward first section 210 and ultimately toward the sections of bore 118 that are in contact with first section 210. As discussed above, the heat adjacent nozzle 106 that is conducted by shield 202 results from combustion gases that are generated based on ignition and burning of fuel injected by injector 222 into a cylinder of an internal combustion engine.

[00040] As shown in the illustrative embodiment of FIGs. 2-2B, assembly 200 is dimensioned for positioning in bore 118. First section 210 of combustion shield 202 is positionable in bore 118 while second section 212 is positionable in receiving bore 117. In one embodiment, second portion 212 includes an annular recess/groove 208 structured to receive a second sealing member 116. In one embodiment of the present disclosure, and as discussed above, second sealing member 116 seals injector bore 118 and injector body 111 from the high temperature combustion gases that occur in response to ignition of the fuel injected by injector 222. In another embodiment, sealing member 204 also seals injector bore 118 and injector body 111 from the aforementioned high temperature combustion gases. Assembly 200 is a thermally conductive or heat transfer component fabricated or formed of one or more materials having various degrees and/or ranges of thermal conductivity. In one embodiment, combustion shield 202 and sealing member 204 are fabricated from substantially the same materials as combustion shield 102 and sealing member 104. The combined thermal conductivity of shield 202 and sealing member 204 cooperate to conduct or transfer combustion gas heat from the nozzle end of injector 222 up into low temperature sections of bore 118. Exemplary low temperature sections of bore 118 include the sections of bore 118 that are in contact with first section 210 of combustion shield 202.

[00041] Much like sealing member 104, sealing member 204 is designed and manufactured to carry a fuel injector clamp load to maintain structural integrity when clamped between fuel injector 222 and the annular wall of bore 118. Thus, assembly 200 beneficially combines combustion sealing with an enhanced ability to conduct, transfer, or wick heat away from nozzle 106 in order to maintain the reliability and sustained usability of fuel injector 222. Sealing member 204 is designed of a metal that is able to withstand the fuel injector clamp loads transmitted by injector 222 unto sealing member 204 and then unto the annular wall of bore 1 18. In one embodiment, combustion shield 202 is fabricated of a metal having a higher thermal conductivity than the material used to produce sealing member 204. Additionally, the contact between sealing member 204, combustion shield 202, fuel injector 222, and bore 118 is optimized to transfer heat from nozzle 106 of fuel injector 222 upwardly to a cooler portion of fuel injector 222. In the illustrative embodiment of FIGs. 2-2B, sealing member 204 is positioned longitudinally and generally between injector body 111 and an interior annular wall of bore 118. Additionally, sealing member 204 is positioned longitudinally below first section 210, longitudinally above second section 212, and around a first end of second section 212. As discussed above, sealing member 204 includes plurality of raised portions 205 wherein each raised portion may be received by a single slot/opening 203 of first section 210. In one embodiment, sealing member 204 is coupled to or mates with combustion shield 202 by way of raised portions 205 being received by openings/slots 203 of first section 210. After mating/coupling, shield 202 and sealing member 204 may be fused together by way of, for example, furnace brazing to form a single unitary combustion shield and sealing component assembly.

[00042] In one embodiment, a third sealing member 206 may be positioned intermediate sealing member 204 and an end section 223 of fuel injector 222. In one aspect of this embodiment, sealing member 206 includes an end surface 220 that is sized and dimensioned to form a fluid seal with end section 223 of fuel injector 222. End surface 220 is a flat planar surface that abuts or contacts end section 223 of fuel injector 222. End section 223 likewise has a flat, planar surface that contacts, mates with or abuts end surface 220 of sealing member 204. Assembly 200 provides a metal to metal combustion seal with contact pressures high enough to yield sealing member 204 into sealing contact against an angled interior annular wall of bore 118 to form an angled and generally conical seal at sealing surface/interface 224. Accordingly, in one embodiment, injector mounting bore 118 and combustion shield 202 cooperate to form a sealing interface 224 that is positioned at an angle relative to needle 108 thereby creating a conical sealing surface. Sealing member 204 includes angled surface 226 that contacts sealing surface 224 when sealing member 204 is positioned longitudinally intermediate end section 223 of injector body 111 and the angled annular wall of bore 118. Hence, the contact between sealing member 204 and surface 226 forms a fluid seal. In one embodiment, angled sealing surface 226 and sealing interface 224 are each at an angle of about 44 degrees with respect to needle 108.

[00043] Much like sealing member 104, sealing member 204 is generally circular in shape and includes an interior ring diameter 216 formed by an annular interior ring wall portion and an angled exterior wall portion/surface 226. In one embodiment, sealing member 204 may be formed of a single unitary piece. Although in various alternative embodiments sealing member 204 may be formed of multiple pieces, a single unitary piece is easier to form and assemble as opposed to two or more pieces. In one embodiment, sealing member 204 may be formed of a stainless steel material, which may be an SAE 303 stainless steel. In addition, to the other benefits provided by sealing member 204, the material of sealing member 204 provides a thermal barrier to the combustion heat from an exemplary combustion chamber. [00044] In one embodiment of the present disclosure, combustion shield 202 is a component that is fabricated distinctly or formed separately from sealing member 204. As shown in the illustrative embodiments of FIGs. 2-2B and FIG. 3, first section 210 generally has at least a first diameter 214 and second section 212 has a second diameter 218 that is smaller than first diameter 214. In one embodiment, combustion shield 202 may be formed of a single unitary piece. Although in various alternative embodiments combustion shield 202 may be formed of multiple pieces, a single unitary piece is easier to form and assemble as opposed to two or more pieces. In one embodiment, combustion shield 202 is a conical load carrying copper heat transfer shield. The conical design allows combustion shield 202 to be received and secured within bore 118 such that sealing member 204 may cooperate with injector 222 and the annular wall of bore 118 to form a robust fluid seal and carry the clamping load induced by injector 222. In one embodiment, second section 212 of combustion shield 202 may provide retention onto nozzle 106 via, for example, a press fit that also allows heat to leave the combustion chamber and move upwardly longitudinally toward low temperature section 132. During installation of assembly 200 and fuel injector 222 into bore 118, when nozzle 106 is positioned within second section 212 of combustion shield 202 an inner surface of second section 212 is directly adjacent to, mates with, abuts, or faces a peripheral outer surface of nozzle 106.

[00045] In the illustrative embodiment of FIGs. 4 and 4 A, injector combustion shield assembly 400 generally includes a combustion shield 402 comprising a fingers section 404 which includes a plurality of fingers 414. Combustion shield 402 and more particularly fingers section 404 has a length that is sufficiently long such that fingers 414 extend longitudinally upwardly within bore 118 to facilitate conduction of heat into a portion of bore 118 that is adjacent water jacket 112 of engine head 120. Combustion shield 402 is substantially the same as combustion shield 202 disclosed in the illustrative embodiment of FIGs. 2-2B, except that shield 402 includes fingers section 404. As generally discussed above in the disclosed embodiment of FIGs. 1 and 1A, the embodiment of FIGs. 4 and 4A also includes plurality of fingers 414 that are structured to contact an exemplary cast iron cylinder head which includes one or more fluid channels that form fluid/water jacket 112. In various embodiments of the present disclosure, fluid water jacket 112 may contain cooled fluid, water or low pressure fuel flowing throughout. Hence, combustion shield 402 is generally structured to conduct heat from and/or adjacent to nozzle 106 longitudinally upwardly toward fingers 414 and ultimately toward the sections of bore 118 that are adjacent to or in closest proximity to fluid jacket 112.

[00046] Referring now to the illustrative embodiment of FIG. 5A and 5B, cross-sectional views of representative injector combustion shields according to an embodiment of the present disclosure are shown. Combustion shield 502A and 502B respectively include first sections 504A/504B, second sections 506A/506B, first diameter 508A/508B and second diameter 510A/510B wherein first diameter 508A/508B is greater than second diameter 510A/510B. In one embodiment, shields 502A/502B provide substantially the same functions regarding fuel injector nozzle tip temperature reduction as disclosed above with respect to combustion shield 102, shield 202, and shield 402. As such, and by way of example, in one or more embodiments of the present disclosure, combustion shield 502A or combustion shield 502B may generally be installed in assembly 100 in place of combustion shield 102.

[00047] FIGs. 6, 6 A, and 6B shows cross-sectional and perspective views of an injector combustion shield according to an embodiment of the present disclosure. Combustion shield 600 includes first section 602 and second section 604. Second section 604 includes a plurality of spring clips or fingers 606 structured to contact an exterior surface of an exemplary nozzle 106 of an exemplary fuel injector 622. In one embodiment, spring clips 606 causes combustion shield 600 to be securely affixed to the exterior surface of nozzle 106. In the illustrative embodiment of FIGs. 6, 6A, 6B, spring clips 606 generally include a curved portion that is structured to provide a spring or clamping force that facilitates affixing shield 600 to nozzle 106. In one embodiment, shield 600 may also be described as a lower injector seal that seals certain areas of injector 622 from heated combustion gases that may enter injector receiving bore 118 during combustion of atomized fuel injected into an exemplary cylinder (not shown) by injector 622. Hence, use of shield/seal 600 results in only the tip of injector nozzle 106 being exposed to an exemplary combustion chamber which helps to mitigate damage to injector 622 due to excessive heat from hot combustion gases. In one embodiment, shield/seal 600 allows for a reduced clamping load to be applied to fuel injector 622 when injector 622 is installed within receiving bore 118. As is known by one of ordinary skill in the art, high or excessive clamping loads on fuel injectors can cause damage to, or distortion of, one or more parts and components associated with the injector.

[00048] FIGs. 7 and 7A-7C show a perspective view of a fuel injector nozzle including an applied thermal barrier and enlarged cross-sectional views of the fuel injector nozzle and engine head including the applied thermal barrier coating according to an embodiment of the present disclosure. The illustrative embodiment of FIGs. 7 and 7A-7C generally includes thermal barrier coating 702 applied to an area of an exemplary cylinder head 706 of engine head 120. In one embodiment, the area to which coating is applied is directly adjacent to and/or immediately surrounding the tip of injector nozzle 106 of fuel injector 722. The embodiment of FIGs. 7 and 7A-7C further includes thermal barrier coating 704 applied directly to the tip of nozzle 106 and/or to other areas of nozzle 106 that are adjacent to or surrounding the tip. In one embodiment, thermal barrier coating 702 and coating 704 are each Plasma Spray Zirconia (PSZ) coatings that provide thermal management of fuel injector tip and nozzle temperatures by reducing temperatures experienced by the injector tip/nozzle during combustion of fuel in a combustion chamber of an internal combustion engine. In one embodiment, use of PSZ coating 702 and PSZ coating 704 either alone or in combination may result in a reduced injector tip/nozzle temperature of at least approximately 30-50 degrees Celsius when exposed to hot combustion gases. In one embodiment, a material including PSZ coating properties generally includes a sol gel material. In yet another embodiment, coating 702 and coating 704 have an applied thickness of approximately 200 microns wherein applied thickness of the coatings may be increased or decreased based on differing fuel injector tip geometries. In one embodiment, exemplary methods of applying coating 704 includes masking the holes of injector nozzle 106 prior to coating or coating nozzle 106 and then blowing off unwanted coating from inside injector 722 prior to the coating being solidified.

[00049] FIGS. 8, 9A, and 9B show cross-sectional views of a fuel injector 822 inserted into fuel injector mounting receiving bore 818 of engine head 820 including a combustion shield assembly 800 having a combustion shield 802 including a sleeve 824, a short shield 826, a retainer 803 and a first sealing member 832 positioned within an injector mounting receiving bore 818. Sleeve 824 and short shield 826 are adjacent to each other within receiving bore 818 with a lower portion of sleeve 824 contacting retainer 803, which is adjacent to first sealing member 832. In an alternate embodiment, sleeve 824 includes a protrusion or dam 825 as shown in FIG. 11, which is positioned inside receiving bore 818 and reduces the gap between bore 818 and sleeve 824 to prevent coolant from bypassing shield assembly 802 as described further below.

[00050] Retainer 803 and first sealing member 832 are positioned between sleeve 824 and short shield 826 within bore 818. Short shield 826 comes in contact with a lower portion of fuel injector 822, is positioned longitudinally above nozzle 806 of fuel injector 822, and forms a seal at the interface of short shield 826 and fuel injector 822 (FIG. 9 A) as described further below.

[00051] In the illustrated embodiment, sleeve 824 is made of pure copper and annealed to allow plastic deformation for press-fit configuration as discussed further below (e.g., ASTM B888, Grade C15100), short shield 826 is made of a copper alloy (e.g., ASTM B888, Grade C15100), and retainer 803 is made of carbon steel. In an alternate embodiment, short shield 826 is made of a copper alloy, sealing member 832 is made of Austenitic Stainless Steel, sleeve 824 is made of an annealed copper alloy, and retainer 803 is made of carbon steel. However, it is contemplated that in alternate embodiments, other suitable materials may be used for sleeve 824, short shield 826, and/or retainer 803.

[00052] As shown in FIGS. 8 and 9 A, sleeve 824, short shield 826, and nozzle 806 are in contact with each other. In the illustrative embodiment, sleeve 824 is press-fit into injector receiving bore 818. This press-fit configuration seals the coolant fluid and prevents the coolant fluid from contacting fuel injector 822. In the illustrated embodiment, sleeve 824 has a thickness of 1 mm. However, it is contemplated that in alternative embodiments, alternate thicknesses of sleeve 824 may be used such that the size of injector bore 818 is minimized while still maintaining the structural integrity of the cylinder head. In addition, short shield 826 is press-fit onto nozzle 806 of fuel injector 822, which seals the combustion gas in the cylinder (not shown) preventing the gas from entering other portions of the engine head. [00053] By having sleeve 824 and short shield 826 as separate parts of combustion shield

802 in the sealing configuration described above, fuel injector 822 is easily removable from injector receiving bore 818 while the coolant fluid remains sealed from the cylinder of an internal combustion engine. Thus, when fuel injector 822 needs to be serviced, fuel injector 822 can be removed from injector receiving bore 818 without having to first drain the coolant fluid from bore 818. As such, the configuration ensures that efficient serviceability of fuel injector 822 is achieved when coolant fluid is introduced into receiving bore 818.

[00054] As shown in Figs. 8, 9A, and 9B, an air space exists between sleeve 824 and short shield 826. As shown in Fig. 9B, there also is a gap 811 near the upper portion of fuel injector 822 between injector receiving bore 818 and fuel injector 822. Gap 811 allows drain fuel to fill the air space between sleeve 824 and short shield 826. By having drain fuel fill the air space, an effective conduction path for the heat from the engine cylinder (not shown) is provided due to the heat conduction properties of drain fuel. In operation, heat is drawn upwards through short shield 826 and is conducted to sleeve 824 via the drain fuel present in the airspace between sleeve 824 and short shield 826, where heat transfer is effectuated by the coolant fluid that is brought closer to injector shield 826.

[00055] O-rings 804 and 808 provide additional sealing such that coolant fluid and fuel do not mix and/or are not exposed to high temperatures of assembly 800. Since no O-ring is present at gap 811 (FIG. 9B), as described earlier, O-ring 804 is provided near the upper portion of sleeve 824 between the receiving bore 818 and the outer surface of sleeve 824 and serves to seal drain fuel from the coolant fluid, thereby preventing the drain fuel and the coolant fluid from mixing. O-ring 808 keeps drain fuel away from higher temperature areas of cylinder head 820, thereby preventing fuel from absorbing heat from cylinder head 820.

[00056] O-ring 810 is positioned between sealing member 832 and short shield 826. O- ring 810 allows sealing member 832 to be installed onto fuel injector 822 such that both sealing member 832 and fuel injector 822 can be installed together. [00057] In the illustrated embodiment, O-rings 804, 808, and 810 are made of FKM as defined by ASTM D1418. In an alternate embodiment, O-rings 804, 808, and 810 are made of synthetic rubber and fluoropolymer elastomers (e.g., VITON®). However, it is contemplated that in alternate embodiments, other suitable materials may be used for O-rings 804, 808, and 810.

[00058] Aside from the sealing provided by the press-fit configuration of combustion shield 802 and O-rings 804 and 808 further sealing is provided by first seal 828 and second seal 830. First seal 828 is located at the interface of fuel injector 822 and short shield 826. Second seal 830 is located at the interface of short shield 826 and first sealing member 832. In the illustrated embodiment, first sealing member 832 is made of stainless steel (e.g., 303 stainless steel). Seals 828, 830 seal the combustion pressure from the rest of assembly 800. Additionally, seal 828 seals the combustion pressure if the press-fit configuration on injector 822 is lost. Further, seal 828 seals drain fuel and prevents drain fuel from reaching nozzle 806. In an exemplary embodiment, first seal 828 has a sealing pressure of approximately 106 MPa, and second seal 830 has a sealing pressure of approximately 100 MPa. In an exemplary embodiment, short shield 826 has a yield strength of 180 MPa.

[00059] In the illustrated embodiment, combustion pressure is also sealed by seal 830 and seal 840, where seal 840 is located at the interface of first sealing member 832 and engine head 820.

[00060] Combustion shield 802 functions to not only provide efficient serviceability of fuel injector 822 without needing to drain coolant from bore 818 but also to conduct or transfer heat from combustion gases near nozzle 806 to lower temperature sections of bore 818. Combustion shield 802 also brings coolant closer to injector shield 826 to reduce the average temperature of the fuel injector and the surrounding nozzle tip (by effectuating additional heat transfer). In an exemplary embodiment, the average surface temperature of the nozzle at on- engine measurement point is 204°C, the maximum temperature at nozzle surfaces in contact with fuel is 263°C, and the maximum temperature at the nozzle tip is 276°C. In an alternate embodiment, combustion shield 802 with a retainer 803 has an average surface temperature of the nozzle at on-engine measurement point of 186°C, a maximum temperature at nozzle surfaces in contact with fuel of 248°C, and a maximum temperature at the nozzle tip of 262°C.

[00061] As mentioned earlier, coolant fluid is brought closer to the injector shield in the illustrated embodiment of FIGs. 8, 9A, and 9B. As shown in FIG. 9A, coolant fluid flows through passage 814 and opening 834. Coolant fluid then moves upward within passage 814 adjacent to sleeve 824. Coolant continues to progress upwardly within fuel injector mounting receiving bore 818 until the coolant fluid reaches O-ring 804, which provides a sealing effect to prevent the coolant fluid from mixing with the drain fuel of the fuel injector 822. In an exemplary embodiment, the coolant fluid used in the system is water. However, it is contemplated that, in alternate embodiments, alternate coolant fluids may be used. Further, coolant fluid is at a temperature that is lower than the operation temperature of the fuel injector 822 such that heat from fuel injector 822 is transferred to the adjacent coolant fluid thereby reducing the overall temperature of fuel injector 822 and nozzle tip temperature.

[00062] In one embodiment, passage 814 leads to an opening 834 through which coolant fluid can flow as described earlier. In an exemplary embodiment, fuel injector receiving bore 818 includes more than one opening. The openings may include drillings that extend from an upper water jacket such as, for example, fluid jacket 812 to the injector bore 818. In an alternate embodiment, multiple outlets/openings along injector bore 818 connect injector bore 818 back to corresponding fluid jacket 812.

[00063] Referring to Fig. 10, an injector bore 818 is shown. Injector bore 818 includes coolant inlets 819 which are located near the top of bore 818 at regions of lower stress under assembled and peak cylinder pressure conditions. In the illustrated embodiment, inlets 819 are drilled at an angle to maintain structural integrity of bore 818, and inlets 819 correspond with passages 814 (not shown in FIG. 10) such that coolant fluid from upper water jacket flows into bore 818. [00064] As mentioned earlier, bore 818 is near dam 825 of sleeve 824 to prevent coolant from bypassing shield assembly 802. Dam 825 reduces the gap between bore 818 and sleeve 824 to redirect coolant downward towards short shield 826.

[00065] In FIG. 12, a method 1000 of assembling combustion shield assembly 802 is shown. At block 1002, short shield 826 is installed onto injector 822 in a press-fit configuration. At block 1004, a sealing member 832 with O-ring 810 is installed onto short shield 826. At block 1006, O-ring 804 is installed onto the upper portion of sleeve 824, and sleeve 824 with O- ring 804 is installed into injector bore 818. At block 1008, retainer 803 is press-fit against sleeve 824. At block 1010, an O-ring 808 is positioned around sealing member 832. At block 1012, injector 822 with short shield 826, sealing member 832, and O-rings 808, 810 are installed within bore 818 and engage with retainer 803 and sleeve 824. Sleeve 824 also engages with bore 818. Sleeve 824 includes a male portion 825A configured to align with a female portion (not shown) on bore 818. The alignment of male portion 825 A of sleeve 824 and the female portion of bore 818 ensures alignment of dam 825 such that coolant bypass is prevented.

[00066] Other mechanisms and approaches for reducing fuel injector nozzle tip temperature are generally described in co-pending U.S. Patent Application Publication No. 2015/0040857 Al filed on August 8, 2013, the entire disclosure of which being expressly incorporated herein by reference and co-pending U.S. Patent Application Publication No. 2013/0133603 Al filed on July 25, 2012, the entire disclosure of which being also expressly incorporated herein by reference.

[00067] Various modifications and additions can be made to the exemplary embodiments discussed without departing from the scope of the present invention. For example, while the embodiments described above refer to particular features, the scope of this invention also includes embodiments having different combinations of features and embodiments that do not include all of the described features. Accordingly, the scope of the present invention is intended to embrace all such alternatives, modifications, and variations as fall within the scope of the claims, together with all equivalents thereof.