Power train assembly

• US 6,866,605 B2
• Filed: 06/28/2002
• Issued: 03/15/2005
• Est. Priority Date: 06/28/2002
• Status: Expired due to Fees

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Fabry, Mark D.
• Primary Examiner(s): Wright, Dirk
• Application Number:
  US10/185,987
• Publication Number:
  US 20040000450A1
• Time in Patent Office: 991 Days
• Field of Search: 475/20, 475/160, 746/06.R, 746/07
• US Class Current: 475/20
• CPC Class Codes: B62D 11/16 the additional power supply being supplied mechanically
• CPC Class Codes: F16H 37/082 and additional planetary reduction gears
• CPC Class Codes: F16H 57/0445 for supply of different gearbox casings or sections
• CPC Class Codes: F16H 57/0447 Control of lubricant levels, e.g. lubricant level control dependent on temperature
• CPC Class Codes: F16H 57/045 Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case
• CPC Class Codes: F16H 57/0479 Gears or bearings on planet carriers
• CPC Class Codes: F16H 57/0483 Axle or inter-axle differentials

Abstract

A power train assembly includes an input member drivingly engaged by a power source, at least one output member and at least one gear assembly. The output member is driveably connected to the input member through the gear assembly. A brake assembly is engaged with the output member and a casing is configured to enclose the gear assembly and the brake assembly. The casing includes a main chamber in communication with at least one storage chamber and a reservoir. The storage chamber is adapted to receive a flow of lubrication fluid from the reservoir.

Claims

1. A power train assembly comprising:

an input member drivingly engaged by a power source;

at least one output member;

at least one gear assembly, said at least one output member being driveably connected to said input member through said at least one gear assembly;

a brake assembly operative to modify a speed of said at least one output member; and

a casing configured to enclose said at least one gear assembly and said brake assembly, said casing comprising;

a main chamber in communication with at least one storage chamber and a reservoir, said at least one storage chamber being adapted to receive a flow of lubrication fluid from said reservoir,

wherein said brake assembly is adapted to receive said fluid from said at least one storage chamber.

2. The power train assembly of claim 1 wherein said at least one storage chamber is defined by an axle housing.

3. The power train assembly of claim 1 wherein said main chamber is defined by a differential housing.

4. The power train assembly of claim 1 wherein said reservoir is defined by a transmission housing.

5. The power train assembly of claim 1 wherein said casing is comprised of at least two portions.

6. The power train assembly of claim 5 wherein said casing constitutes a split casing.

7. The power train assembly of claim 1 wherein said casing comprises said transmission housing, said differential housing and said at least one axle housing.

8. The power train assembly of claim 7 wherein said at least one axle housing is in fluid communication with the transmission housing through a conduit.

9. The power train assembly of claim 8, further comprising a pump, said pump is operative to urge fluid from said transmission housing to said at least one axle housing through said conduit.

10. The power train assembly of claim 1 wherein said brake assembly is configured to receive fluid being successively urged through said storage chamber and said main chamber.

11. The power train assembly of claim 10 further comprising a pump operative to urge fluid into said storage chamber.

12. The power train assembly of claim 1 further comprising:

first and second final drive assemblies, a second gear assembly;

a second output member;

a second brake assembly; and

a second storage chamber, said second output member being driveably connected to said input member through said second gear assembly, said second brake assembly is operative to modify a speed of said second output member, said first final drive assembly is engaged with said gear assembly and said second final drive assembly is engaged with said second gear assembly, said first and second storage chambers are configured to receive fluid from said reservoir, said first brake assembly is configured to receive fluid from said storage chamber through said first final drive assembly and said second brake assembly is configured to receive fluid from said second storage chamber through said second final drive assembly.

13. The power train assembly of claim 1 wherein said brake assembly is configured to receive fluid being successively urged through said storage chamber and said main chamber.

14. The power train assembly of claim 1 further comprising a reduction gear assembly disposed between the at least one gear assembly and a fluid scavenge input configured to receive fluid from said reservoir.

15. The power train assembly of claim 1 wherein said at least one storage chamber is configured to be substantially full of fluid.

16. The power train assembly of claim 1, further comprising fluid circulation means for directing fluid through said brake assembly to carry away heat generated by said brake assembly.

17. A method for operating a power train assembly, the power train assembly comprising:

an input member;

at least one output member;

at least one gear assembly, said output member being driveably connected to said input member through said at least one gear assembly;

a brake engagable with the at least one output member and being operative to modify a speed of the output member;

a fluid reservoir; and

a casing comprising;

a main chamber configured to enclose said at least one gear assembly and a storage chamber, the method comprising;

storing an amount of fluid in the fluid reservoir;

directing fluid from the reservoir into the storage chamber of the casing; and

causing fluid to be directed from the storage chamber to the at least one brake assembly.

18. The method of claim 17 further comprising:

drawing fluid from the main chamber and discharging fluid to the reservoir.

19. The method of claim 17 further comprising:

directing fluid from the storage chamber to the at least one gear connection dependent on a first speed range of the at least one output member.

20. The method of claim 17 further comprising:

directing fluid from the storage chamber to the brake assembly dependent on a first speed range of the at least one output member.

21. The method of claim 17 further comprising:

urging fluid from the reservoir into the main chamber through a second storage chamber.

22. The method of claim 17 further comprising:

limiting flow from the at least one storage chamber to the main chamber through a reduction gear assembly.

23. A differential and final drive assembly comprising:

a driveably engageable drive member;

at least one output member;

at least one gear assembly, said output member being driveably connected to said drive member through said at least one gear assembly;

a brake assembly operative to modify a speed of said at least one output member;

a casing configured to enclose said at least one gear assembly and said brake assembly, said casing comprising;

a main chamber in communication with at least one storage chamber; and

a reduction gear assembly disposed between said brake assembly and said storage chamber, said reduction gear assembly being structured and arranged with said brake assembly to direct a flow of lubrication fluid toward said brake assembly.

24. The differential and final drive assembly of claim 23 wherein said main chamber is configured to sustain a fluid level therein at predetermined distance below a centerline of the at least one output member.

25. The differential and final drive assembly of claim 23 further comprising a second output member, said output member and said second output member being urged to rotate in response to rotation of said drive member.

26. The differential and final drive assembly of claim 23 wherein said brake assembly is attached to said at least one gear assembly.

27. The differential and final drive assembly of claim 23 further comprising a second gear assembly and a second brake assembly, said gear assembly and said second gear assembly being rotatably driven by said drive member.

28. The differential and final drive assembly of claim 27 further comprising a third gear assembly adapted to engage with one of said gear assembly or said second gear assembly to cause a difference in rotational speeds of said output member and a second output member connected to said second gear assembly.

29. The differential and final drive assembly of claim 23 wherein said reduction gear assembly includes at least one planet support, said planet support is adapted to direct fluid toward said at least gear assembly.

30. The differential and final drive assembly of claim 29 wherein said at least one planet support includes at least one radially disposed hole adapted to provide fluid to said at least one gear assembly and an axially disposed hole adapted to provide fluid to said brake assembly.

31. The differential and final drive assembly of claim 23 wherein said brake assembly comprises a rotatable brake plate disposed between a reaction member and an axially moveable piston plate.

32. The differential and final drive assembly of claim 31 wherein said reaction member defines a space, said brake plate adapted to receive fluid from said at least one storage chamber through said space.

33. The differential and final drive assembly of claim 32 wherein fluid is directed through said space dependent on a speed of said at least one output member.

34. The differential and final drive assembly of claim 32 wherein said planet support of said reduction gear member is configured to direct fluid toward said space within said reaction member.

35. The differential and final drive assembly of claim 32 further comprising a cylinder plate attached to said casing and adapted to support said piston plate, said cylinder plate and said casing including a space therebetween to allow fluid to circulate through said brake assembly.

36. The differential and final drive assembly of claim 32 further comprising a cylinder plate attached to said casing and adapted to support said piston plate, said casing including a passage therein to allow fluid to circulate through said brake assembly.