Title:
HYDRAULICALLY-ACTUATED FUEL INJECTOR WITH INTENSIFIER PISTON ALWAYS EXPOSED TO HIGH PRESSURE ACTUATION FLUID INLET
Document Type and Number:
WIPO Patent Application WO/2000/012890
Kind Code:
A2
Abstract:
A hydraulically-actuated fuel injector (10) includes an injector body (11) that defines an actuation fluid inlet (15) that is open to a first actuation fluid cavity (27), and a second actuation fluid cavity (28) that is connected to the first actuation fluid cavity (27) via a connection passage (29). The injector body (11) also defines at least one actuation fluid drain (17, 18). A source of relatively high pressure actuation fluid (13) is connected to the actuation fluid inlet (15). A relatively low pressure reservoir (16) is connected to the at least one actuation fluid drain (17, 18). A control valve (12) is attached to the injector body (11) and is moveable between a first position in which the second actuation fluid cavity (28) is open to the first actuation fluid cavity (27), and a second position in which the second actuation fluid cavity (28) is open to the at least one actuation fluid drain (17, 18). An intensifier piston (40) is exposed to fluid pressure in the first actuation fluid cavity (27), and in the second actuation fluid cavity (28).
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Inventors:
TIAN STEVEN Y
Application Number:
PCT/US1999/016316
Publication Date:
March 09, 2000
Filing Date:
July 19, 1999
Export Citation:
Assignee:
CATERPILLAR INC (US)
International Classes:
F02M47/02; F02M47/00; F02M47/04; F02M57/02; F02M59/10; (IPC1-7): F02M57/00
Foreign References:
| US5460329A | 1995-10-24 | |||
| EP0828073A2 | 1998-03-11 |
Attorney, Agent or Firm:
Bram, Eric M. (IL, US)
Download PDF:
Claims:
Claims
| 1. | A hydraulically actuated fuel injector (10) including : an injector body (11) defining an actuation fluid inlet (15) open to a first actuation fluid cavity (27), and a second actuation fluid cavity (28) connected to said first actuation fluid cavity (27) via a connection passage (29), and further defining at least one actuation fluid drain (17, 18) ; a source of relatively high pressure actuation fluid (13) connected to said actuation fluid inlet (15) ; a relatively low pressure reservoir (16) connected to said at least one actuation fluid drain (17, 18) ; a control valve (12) attached to said injector body (11) and being movable between a first position in which said second actuation fluid cavity (28) is open to said first actuation fluid cavity (27), and a second position in which said second actuation fluid cavity (28) is open to said at least one actuation fluid drain (17, 18 ; and an intensifier piston (40) movably mounted in said injector body (11) and having a primary hydraulic surface (41) exposed to fluid pressure in said first actuation fluid cavity (27) and an opposing hydraulic surface (42) exposed to fluid pressure in said second actuation fluid cavity (28). |
| 2. | The hydraulically actuated fuel injector (10) of claim 1 further including a direct control needle valve that includes said injector body (11) defining a nozzle outlet (57) and a needle valve member (60) with a closing hydraulic surface (64) movably positioned in said injector body (11). |
| 3. | The hydraulically actuated fuel injector (10) of claim 1 wherein said injector body (11) further defines a fuel inlet (72) connected to a source of fuel fluid (70) ; and said source of relatively high pressure actuation fluid (13) that is different from said source of fuel fluid (70). |
| 4. | The hydraulically actuated fuel injector (10) of claim 1 further including a single solenoid (20) attached to said injector body (11) and being operably connected to said control valve (12). |
| 5. | The hydraulically actuated fuel injector (10) of claim 1 wherein said control valve (12) includes a ball valve member (24) trapped between a high pressure seat (25) and a low pressure seat (26). |
| 6. | The hydraulically actuated fuel injector (10) of claim 1 further including a pressure relief valve (30) positioned in said connection passage (29) between said control valve (12) and said second actuation fluid cavity (28). |
| 7. | The hydraulically actuated fuel injector (10) of claim 1 wherein said injector body (11) defines a needle control chamber (50) that is open to said actuation fluid inlet (15) when said control valve (12) is in said first position, and open to said at least one actuation fluid drain (17, 18) when said control valve (12) is in said second position. |
| 8. | The hydraulically actuated fuel injector (10) of claim 1 wherein said primary hydraulic surface (41) is smaller than said opposing hydraulic surface (42). |
| 9. | A hydraulically actuated fuel injector (10) including : an injector body (11) defining an actuation fluid inlet (15) open to a first actuation fluid cavity (27), and a second actuation fluid cavity (28) connected to said first actuation fluid cavity (27) via a connection passage (29), and further defining at least one actuation fluid drain (17, 18) and a fuel inlet (72) ; a source of relatively high pressure actuation fluid (13) connected to said actuation fluid inlet (15) ; a relatively low pressure reservoir (16) connected to said at least one actuation fluid drain (17, 18) ; a source of medium pressure fuel fluid (70) connected to said fuel inlet (72) ; a control valve (12) attached to said injector body (11) and being movable between a first position in which said second actuation fluid cavity (28) is open to said first actuation fluid cavity (27), and a second position in which said second actuation fluid cavity (28) is open to said at least one actuation fluid drain (17, 18) ; and an intensifier piston (40) movably mounted in said injector body (11) and having a primary hydraulic surface (41) exposed to fluid pressure in said first actuation fluid cavity (27) and an opposing hydraulic surface (42) exposed to fluid pressure in said second actuation fluid cavity (28). |
| 10. | The hydraulically actuated fuel injector (10) of claim 9 wherein said actuation fluid is different from said fuel fluid. |
| 11. | The hydraulically actuated fuel injector (10) of claim 10 further including a single solenoid (20) attached to said injector body (11) and being operably connected to said control valve (12). |
| 12. | The hydraulically actuated fuel injector (10) of claim 11 wherein said control valve (12) includes a ball valve member (24) trapped between a high pressure seat (25) and a low pressure seat (26). |
| 13. | The hydraulically actuated fuel injector (10) of claim 12 further including a pressure relief valve (30) positioned in said connection passage (29) between said control valve (12) and said second actuation fluid cavity (28). |
| 14. | The hydraulically actuated fuel injector (10) of claim 13 wherein said injector body (11) defines a needle control chamber (50) that is open to said actuation fluid inlet (15) when said control valve (12), is in said first position, and open to said at least one actuation fluid drain (17, 18) when said control valve (12) is in said second position. |
| 15. | A hydraulically actuated fuel injector (10) including : an injector body (11) defining an actuation fluid inlet (15) open to a first actuation fluid cavity (27), and a second actuation fluid cavity (28) connected to said first actuation fluid cavity (27) via a connection passage (29), and further defining at least one actuation fluid drain (17, 18) ; a source of relatively high pressure actuation fluid (13) connected to said actuation fluid inlet (15) ; a relatively low pressure reservoir (16) connected to said at least one actuation fluid drain (17, 18) ; a control valve (12) attached to said injector body (11) and being movable between a first position in which said second actuation fluid cavity (28) is open to said first actuation fluid cavity (27), and a second position in which said second actuation fluid cavity (28) is open to said at least one actuation fluid drain (17, 18) ; a single solenoid (20) attached to said injector body (11) and being operably connected to said control valve (12) ; an intensifier piston (40) movably mounted in said injector body (11) and having a primary hydraulic surface (41) exposed to fluid pressure in said first actuation fluid cavity (27) and an opposing hydraulic surface (42) exposed to fluid pressure in said second actuation fluid cavity (28) ; and a direct control needle valve that includes said injector body (11) defining a nozzle outlet (57) and a needle valve member (60) with a closing hydraulic surface (64) movably positioned in said injector body (11). |
| 16. | The hydraulically actuated fuel injector (10) of claim 15 wherein said injector body (11) defines a needle control chamber (50) that is open to said actuation fluid inlet (15) when said control valve (12) is in said first position, and open to said at least one actuation fluid drain (17, 18) when said control valve (12) is in said second position ; and said closing hydraulic surface (64) being exposed to fluid pressure in said needle control chamber (50). |
| 17. | The hydraulically actuated fuel injector (10) of claim 16 further including a pressure relief valve (30) positioned in said connection passage (29) between said control valve (12) and said second actuation fluid cavity (28). |
| 18. | The hydraulically actuated fuel injector (10) of claim 17 wherein said pressure relief valve includes a relief valve member (30) with an upper hydraulic surface (31) exposed to fluid pressure in said connection passage (29) adjacent said control valve (12), and a lower hydraulic surface (32) exposed to fluid pressure in said second actuation fluid cavity (28). |
| 19. | The hydraulically actuated fuel injector (10) of claim 18 wherein said relief valve member (30) defines a central passage (33). |
| 20. | The hydraulically actuated fuel injector (10) of claim 19 wherein said injector body (11) defines a fuel inlet (72) connected to a source of fuel fluid (70) that is different from said actuation fluid. |
Description:
INTERNATIONAL SEARCH REPORT oints onal Application No lffortnetlon on patentfemily members 1 Patent document Publication Patent family Publication cited in search report date member (s) date US 5460329 A 24-10-1995 WO 9702423 A 23-01-1997 AU 2958995 A 05-02-1997 EP 0835376 A 15-04-1998 GB 2316449 A 25-02-1998 EP 0828073 A 11-03-1998 US 5833146 A 10-11-1998 JP 10089189 A 07-04-1998
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