Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
AN ENGINE ENCLOSURE
Document Type and Number:
WIPO Patent Application WO/2007/045030
Kind Code:
A1
Abstract:
There is disclosed herein a dozer engine (10) including a cooling fan (11), an engine air intake (15), an engine exhaust (16), and an engine enclosure, indicated generally by the reference numeral (20). The enclosure (20) includes a noise barrier (30), which extends around the top, bottom, rear and sides of the engine (10). The barrier (30) is formed from a relatively inflexible material, such as steel and is lined with an energy absorbing, and fire retardant, material (40), such as an elastomeric material.

More Like This:
Inventors:
STUDDERT GRAEME DECLARE (AU)
ZANDONA JUSTIN DENNIS (AU)
KIRKNESS TIMOTHY JAMES (AU)
Application Number:
PCT/AU2006/001544
Publication Date:
April 26, 2007
Filing Date:
October 18, 2006
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
GHD PTY LTD (AU)
STUDDERT GRAEME DECLARE (AU)
ZANDONA JUSTIN DENNIS (AU)
KIRKNESS TIMOTHY JAMES (AU)
International Classes:
F02B77/13; B60R13/08; F01P11/12; F02B77/00
Foreign References:
GB2272486A1994-05-18
DE19846666A11999-04-15
US5297517A1994-03-29
GB1166140A1969-10-08
Attorney, Agent or Firm:
SPRUSON & FERGUSON (Sydney, NSW 2001, AU)
Download PDF:
Claims:

CLAIMS:

1. An engine enclosure comprising: a noise barrier for at least partially enclosing an engine; at least one hollow ventilation shaft adapted, to provide fluid communication between an interior of the enclosure and an exterior of the enclosure; and an energy absorbing layer at least partially lining the shaft to dampen noise transmitted through the shaft from within the enclosure.

2. An engine enclosure according to claim 1, wherein the noise barrier is formed from a relatively inflexible material.

3. An engine enclosure according to claim 2, wherein the noise barrier is formed from steel.

4. An engine enclosure according to any one of the preceding claims, wherein the noise barrier is adapted to extend around at least the top, bottom, rear and sides of the engine.

5. An engine enclosure according to any one of the preceding claims, wherein the noise barrier is lined with an energy absorbing material.

6. An engine enclosure according to claim 1, wherein the noise barrier is formed from an elastomeric material.

7. An engine enclosure according to any one of the preceding claims, wherein the energy absorbing layer is formed from a relatively deformable material.

8. An engine enclosure according to any one of the preceding claims, wherein the energy absorbing layer is formed from an elastomeric material.

9. An engine enclosure according to any one of claims 1 to 5, wherein the energy absorbing layer comprises at least one material selected from the group comprising: rubber, plastics, glass fibre, rock fibre and derivatives thereof.

10. An engine enclosure according to any one of the preceding claims, wherein the energy absorbing layer is formed from a fire retardant material.

11. An engine enclosure according to any one of the preceding claims, wherein the 5 ventilation shaft is adapted to direct cooling air toward a cooling fan of the engine.

12. An engine enclosure according to any one of the preceding claims, wherein the ventilation shaft is adapted to direct air toward an air intake of the engine.

Q 13. An engine enclosure according to any one of the preceding claims, comprising a plurality of said ventilation shafts.

14. An engine enclosure according to claim 13, wherein said plurality of ventilation shafts include side ventilation shafts adapted to extend along each side of the engine to s direct external air toward a cooling fan of the engine.

15. An engine enclosure according to claim 14, wherein said side ventilation shafts are thermally insulated from the engine.

0 16. An engine enclosure according to claim 15, further comprising an insulating wall between the side ventilation shafts and the engine to thermally insulate the side ventilation shafts from the engine.

17. An engine enclosure according to any one of claims 13 to 16, wherein all of said 5 ventilation shafts are lined with the energy absorbing layer.

18. An engine enclosure according to any one of claims 13 to 16, wherein some of said ventilation shafts are lined with the energy absorbing layer.

Q 19. An engine enclosure according to any one of the preceding claims, further comprising top ventilation shafts adapted to extend from above the engine to direct external air from above the engine downwardly toward the engine for facilitating combustion and/or for cooling.

20. An engine enclosure according to any one of the preceding claims, further comprising an exhaust shaft for exhausting warm air and/or combustion by-products from the enclosure.

5 21. An engine enclosure according to claim 20, wherein the exhaust shaft is lined with an energy absorbing material.

22. An engine enclosure according to claim 21, wherein the energy absorbing material lining the exhaust shaft is a relatively deformable material. 0

23. An engine enclosure according to claim 21 or claim 22, wherein the energy absorbing material lining the exhaust shaft is an elastomeric material.

24. An engine enclosure according to claim 21, wherein the energy absorbing s material lining the exhaust shaft comprises at least one material selected from the group comprising: rubber, plastics, glass fibre, rock fibre, and derivatives thereof.

25. An engine enclosure according to any one of claims 21 to 24, wherein the energy absorbing material lining the exhaust shaft is a fire retardant material. 0

26. A tracked vehicle comprising an engine; and an engine enclosure comprising: a noise barrier for at least partially enclosing an engine; s at least one ventilation shaft adapted to provide fluid communication between an interior of the enclosure and an exterior of the enclosure; and an energy absorbing layer at least partially lining the shaft to dampen noise transmitted through the shaft from within the enclosure.

o 27. An engine enclosure according to claim 26, wherein the noise barrier is formed from a relatively inflexible material.

28. An engine enclosure according to claim 26 or claim 27, wherein the noise barrier is formed from steel. 5

29. An engine enclosure according to any one of claims 26 to 28, wherein the noise barrier is adapted to extend around at least the top, bottom, rear and sides of the engine.

30. An engine enclosure according to any one of claims 26 to 29, wherein the noise barrier is lined with an energy absorbing material.

31. An engine enclosure according to claim 26, wherein the noise barrier is formed from an elastomeric material.

32. An engine enclosure according to any one of claims 26 to 31, wherein the energy absorbing layer is formed from a relatively deformable material.

33. An engine enclosure according to any one of claims 26 to 32, wherein the energy absorbing layer is formed from an elastomeric material.

34. An engine enclosure according to any one of claims 26 to 30, wherein the energy absorbing layer is formed at least one material selected from the group comprising: rubber, plastics, glass fibre, rock fibre, and derivatives thereof.

35. An engine enclosure according to any one of claims 26 to 34, wherein the energy absorbing layer is formed from a fire retardant material.

36. An engine enclosure according to any one of claims 26 to 35, wherein the ventilation shaft is adapted to direct cooling air toward a cooling fan of the engine.

37. An engine enclosure according to any one of claims 26 to 35, wherein the ventilation shaft is adapted to direct air toward an air intake of the engine.

38. An engine enclosure according to any one of claims 26 to 37, comprising a plurality of said ventilation shafts.

39. An engine enclosure according to claim 38, wherein said plurality of ventilation shafts include side ventilation shafts adapted to extend along each side of the engine to direct external air toward a cooling fan of the engine.

40. An engine enclosure according to claim 39, wherein said side ventilation shafts are thermally insulated from the engine.

41. An engine enclosure according to claim 40, further comprising an insulating wall between the side ventilation shafts and the engine to thermally insulate the side ventilation shafts from the engine.

42. An engine enclosure according to any one of claims 38 to 41, wherein all of said ventilation shafts are lined with the energy absorbing layer.

43. An engine enclosure according to any one of claims 38 to 41, wherein some of said ventilation shafts are lined with the energy absorbing layer.

44. An engine enclosure according to any one of claims 26 to 43, further comprising top ventilation shafts adapted to extend from above the engine to direct external air from above the engine downwardly toward the engine for facilitating combustion and/or for cooling.

45. An engine enclosure according to any one of claims 26 to 44, further comprising an exhaust shaft for exhausting warm air and/or combustion by-products from the enclosure.

46. An engine enclosure according to claim 45, wherein the exhaust shaft is lined with an energy absorbing material.

47. An engine enclosure according to claim 46, wherein the energy absorbing material lining the exhaust shaft is a relatively deformable material.

48. An engine enclosure according to claim 46 or claim 47, wherein the energy absorbing material lining the exhaust shaft is an elastomeric material.

49. An engine enclosure according to claim 46, wherein the energy absorbing material lining the exhaust shaft comprises at least one material selected from the group comprising: rubber, plastics, glass fibre, rock fibre, and derivatives thereof.

50. An engine enclosure according to any one of claims 46 to 49, wherein the energy absorbing material lining the exhaust shaft is a fire retardant material.

Description:

AN ENGINE ENCLOSURE

Field of the Invention

The present invention relates generally to noise attenuation for vehicles and more particularly to an engine enclosure.

5

The invention will be described hereinafter with reference to an engine enclosure for a dozer, but it will be appreciated that it is not limited to this particular application and may also be applied, for example, to tracked military vehicles, such as tanks, construction and mining equipment, as well as to engines generally. o Background of the Invention

The noise generated within vehicle engine bays, and particularly those of heavy earth moving vehicles, can pose a hearing health risk to vehicle operators and is also often a nuisance to the community. The engine bay noise includes general engine noise and hydraulic component noise, as well as noise generated by the engine cooling system, s which often includes a fan for directing air through a radiator to cool the engine and to remove warm air from the engine.

To reduce vehicle noise, some known dozers are provided with engine enclosures, which reduce noise transmission to the operator as well as to the broader surrounding 0 environment. Some known engine enclosures extend around both the engine and the fan, whereas other known enclosures include separate compartments for the engine and fan. While known engine enclosures reduce noise, they also interfere with the flow of air around the engine, which reduces engine performance and cooling system efficiency.

s It will also be understood that, during operation, dozers disperse relatively large quantities of particulate material, such as fines, into the surrounding air due to the engagement of the dozer's blade and tracks with the ground. The concentration of particulate material in the air surrounding dozers is typically higher close to the ground. Known engine enclosures fail to adequately prevent such particulate material from entering the enclosure o and adversely effecting engine performance and cooling efficiency.

Object of the Invention

It is the object of the present invention to overcome or substantially ameliorate one or more of the disadvantages of the prior art.

Summary of the Invention

Accordingly, in a first aspect, the invention provides an engine enclosure comprising: a noise barrier for at least partially enclosing an engine; at least one hollow ventilation shaft adapted to provide fluid communication between an interior of the enclosure and an exterior of the enclosure; and an energy absorbing layer at least partially lining the shaft to dampen noise transmitted through the shaft from within the enclosure.

In a second aspect, the invention provides a tracked vehicle comprising an engine; and an engine enclosure comprising: a noise barrier for at least partially enclosing an engine; at least one ventilation shaft adapted to provide fluid communication between an interior of the enclosure and an exterior of the enclosure; and an energy absorbing layer at least partially lining the shaft to dampen noise transmitted through the shaft from within the enclosure.

Preferably, the noise barrier is formed from a relatively inflexible material, such as steel. More preferably, the noise barrier extends around at least the top, bottom, rear and sides of the engine. In a preferred form, the noise barrier is lined with an energy absorbing material, such as an elastomeric material.

Preferably, the energy absorbing layer lining the shaft is formed from a relatively deformable material, such as an elastomeric material. More preferably, the energy absorbing layer comprises one or more material selected from the group comprising: rubber, plastics, glass fibre, rock fibre and derivatives thereof. The material forming the energy absorbing layer is preferably also a fire retardant material. In a preferred form, the ventilation shaft is adapted to direct cooling air toward a cooling fan of the engine. In other embodiments the ventilation shaft is adapted to direct air toward an air intake of the engine.

Preferably, a plurality of ventilation shafts are provided. In some embodiments, side ventilation shafts extend along each side of the engine to direct external air toward a cooling fan of the engine. Preferably, the side ventilation shafts are thermally insulated from the engine. More preferably, an insulating wall is provided to thermally insulate the

side shafts from the engine. In other embodiments, top ventilation shafts extend from above the engine to direct external air from above the engine downwardly toward the engine for facilitating combustion and/or for cooling. In some preferred forms, the enclosure includes both side and top ventilation shafts. In some embodiments, all of the ventilation shafts are lined with the energy absorbing layer, and in other embodiments only some of the shafts are lined.

Preferably, the enclosure also includes an exhaust shaft for exhausting warm air and/or combustion by-products from the enclosure. More preferably, the exhaust shaft is lined with an energy absorbing material. More preferably, the energy absorbing material lining the shaft comprises one or more material selected from the group comprising: rubber, plastics, glass fibre, rock fibre and derivatives thereof. The material forming the energy absorbing layer lining the shaft is preferably also a fire retardant material, hi a preferred form, the ventilation shaft is adapted to direct cooling air toward a cooling fan of the engine, hi other embodiments the ventilation shaft is adapted to direct air toward an air intake of the engine.

Brief Description of the Drawings

A preferred embodiment will be described hereinafter, by way of an example only, with reference to the accompanying drawings, in which:

Figure 1 is a front elevation of a preferred embodiment of an engine enclosure; and

Figure 2 is a cross-sectional plan view of the engine and engine enclosure of Figure 1.

Preferred Embodiment of the Invention Referring to the drawings, there is shown a dozer engine 10 including a cooling fan 11, an engine air intake 15, an engine exhaust 16, and a preferred embodiment of an engine enclosure, indicated generally by the reference numeral 20.

The enclosure 20 includes a noise barrier 30, which extends around the top, bottom, rear and sides of the engine 10. The barrier 30 is formed from a relatively inflexible material, such as steel and is lined with an energy absorbing, and fire retardant, material 40, such as an elastomeric material. Examples of suitable lining materials are closed or open celled rubber or plastics materials, glass fibre, rock fibre or derivatives and/or combinations

thereof. However, in alternative embodiments, other relatively deformable, elastomeric materials are used.

The enclosure 20 also includes side ventilation shafts 50, which extend through the noise barrier 30, along each side of the engine 10 to provide fluid communication between an interior and an exterior of the enclosure 20. The side shafts 50 direct external air toward the cooling fan 11. The side shafts 50 are lined with an energy absorbing layer 51, such as an elastomeric material, to dampen noise transmitted through the shafts 50 from within the enclosure 20. The lining 51 is also fire retardant. Examples of suitable shaft 50 lining materials are closed or open celled rubber or plastics materials, glass fibre, rock fibre or derivatives and/or combinations thereof. However, in alternative embodiments, other relatively deformable, elastomeric materials are used. The side shafts 50 are thermally insulated from the engine 10 by an inner wall 52. This insulation ensures that cooling air entering the enclosure 20 through the side shafts 50 is not unduly warmed by the engine 10. The inner opening 53 of the side shafts 50 is located adjacent the fan 11.

The enclosure 20 further includes top ventilation shafts 60, which extend through the barrier 30 from above the engine 10 to provide fluid communication between an interior and an exterior of the enclosure 20. The top shafts 60 direct external air from above the engine 10 downwardly around the engine 10 to facilitate cooling.

hi alternative embodiments (not shown), the engine enclosure includes the side ventilation shafts only. In other embodiments (not shown), only the top ventilation shafts are provided.

hi other embodiments (not shown), an intake shaft (not shown) is provided to direct external air into the air intake 15 of the engine 10 for facilitating combustion, hi further embodiments (not shown), the enclosure also includes an exhaust shaft (not shown) for exhausting warm air from the enclosure 20 and/or combustion by-products from the engine exhaust 16. The intake and exhaust shafts (not shown) are lined with an energy absorbing layer (not shown), such as an elastomeric material, to dampen noise transmitted through the intake and exhaust shafts from within the enclosure 20. Examples of suitable linings for the air intake and exhaust shafts are closed or open celled rubber or plastics materials, glass fibre, rock fibre or derivatives and/or combinations thereof. However, in alternative embodiments, other relatively deformable, elastomeric materials are used.

It will be appreciated that the illustrated engine enclosure reduces the level of noise transmitted from the engine to the surrounding environment by utilising lined ventilation shafts, which absorb noise that would otherwise escape therethrough. Accordingly, the risk of damage to hearing health of the engine operator is reduced, as is the environmental impact of noise generated by the engine. Also, because the top ventilation shafts extend from above the engine, the likelihood of air-entrained granular material, such as fines, being directed into the engine air intake is reduced.