Final drive having a lubrication system

• US 8,267,827 B2
• Filed: 07/12/2010
• Issued: 09/18/2012
• Est. Priority Date: 07/12/2010
• Status: Active Grant

• Current Assignee: Deere & Company
• Original Assignee: Deere & Company
• Inventors: Durbin, Brian D., Wagner, Tammo
• Primary Examiner(s): Wright, Dirk
• Application Number:
  US12/834,119
• Publication Number:
  US 20120010037A1
• Time in Patent Office: 799 Days
• Field of Search: None
• US Class Current: 475/159
• CPC Class Codes: F16H 2057/02052 Axle units; Transfer casings for four wheel drive
• CPC Class Codes: F16H 57/0423 Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes means for guiding lubricant into an axial channel of a shaft F16H57/0426; lubrication by injection, injection nozzles or tubes therefore F16H57/0456
• CPC Class Codes: F16H 57/0473 Friction devices, e.g. clutches or brakes
• CPC Class Codes: F16H 57/0483 Axle or inter-axle differentials

Abstract

A final drive comprising a lubrication system is provided. The final drive comprises an axle housing and a differential housing. The differential housing is in alignment with the axle housing, and they share a longitudinal axis. The final drive further comprises a lubricant ring having a lubricant ring inner diameter. The lubricant ring travels about an inner surface of the axle housing. Further, the final drive has a longitudinal axis region, defined as the region formed by the lubricant ring inner diameter. The lubrication system comprises a lubrication inlet in fluid communication with a lubricant outlet. The lubrication inlet is disposed in the axle housing to capture a portion of the lubricant ring. The lubricant outlet is disposed in the differential housing to distribute the portion of the lubricant ring generally to the longitudinal axis region.

Claims

1. A final drive having a lubrication system, the final drive comprising an axle housing having an inner surface;

a differential housing, wherein the axle housing and the differential housing share a longitudinal axis;

a lubricant ring having a lubricant ring inner diameter traveling about the inner surface;

a longitudinal axis region, wherein the longitudinal axis region is a region formed by the lubricant ring inner diameter about the longitudinal axis; and

the lubrication system, comprising;

a lubrication inlet disposed in the axle housing to capture a portion of the lubricant ring; and

a lubrication outlet in fluid communication with the lubrication inlet, wherein the lubrication outlet is disposed within the differential housing, and the lubrication outlet distributes the portion of the lubricant ring generally to the longitudinal axis region.

2. The final drive of claim 1, further comprising a shaft disposed within at least one of the axle housing and the differential housing;

and

a friction disc mounted about the shaft and fixed for rotation therewith.

3. The final drive of claim 2, wherein:

the friction disc has an inboard side and an outboard side, wherein the inboard side is the side facing the differential housing, and the outboard side is the side facing the axle housing;

the friction disc has an inner diameter region, wherein the inner diameter region is the region formed by the lubricant ring inner diameter on the inboard and outboard sides; and

the lubrication outlet distributes the portion of the lubricant ring to the inboard side of the inner diameter region of the friction disc.

4. The final drive of claim 1, wherein the lubrication inlet is a generally V-shaped fitting.

5. The final drive of claim 1, further comprising a conduit and a passage, wherein the conduit is positioned between the lubrication inlet and the passage, the conduit is substantially outside of the axle housing, the passage is positioned between the conduit and the lubrication outlet, and the passage is formed into the differential housing.

6. The final drive of claim 5, further comprising:

a first fitting positioned between the lubrication inlet and the conduit, and

a second fitting positioned between the conduit and the passage.

7. The final of claim 6, further comprising:

a shaft disposed within at least one of the housings; and

a friction disc mounted about the shaft and fixed for rotation therewith, wherein;

the friction disc has an inboard side, an outboard side, and an inner diameter region;

the inboard side is the side facing the differential housing;

the outboard side is the side facing the axle housing;

the inner diameter region is the region formed by the lubrication ring inner diameter on the inboard and outboard sides of the friction disc; and

the lubrication outlet distributes the portion of the lubrication ring to the inboard side of the inner diameter region of the friction disc.

8. A final drive having a lubrication system, the final drive comprising an axle housing having an inner surface;

a differential housing in alignment with the axle housing;

a lubrication ring having a lubricant ring inner diameter traveling about the inner surface;

a shaft disposed within at least one of the housings;

a friction disc having an inner diameter region mounted about the shaft and fixed for rotation therewith, wherein the inner diameter region is the region formed by the lubrication ring inner diameter; and

the lubrication system, comprising;

a lubrication inlet disposed in the axle housing, wherein the lubrication inlet projects into the lubrication ring to capture a portion of the lubrication ring; and

a lubrication outlet in fluid communication with the lubrication inlet, wherein the lubrication outlet distributes the portion of the lubricant ring in a direction generally towards the inner diameter region of the friction disc.

9. The final drive of claim 8, wherein the lubrication outlet is disposed in the differential housing.

10. The final drive of claim 8, wherein:

the friction disc has an inboard side and an outboard side, the inboard side facing the differential housing, and the outboard side facing the axle housing;

the lubricant ring travels about the outboard side of the friction disc;

the lubrication inlet is disposed on the outboard side of the friction disc; and

the lubrication outlet distributes the lubricant to the inboard side of the friction disc.

11. The final drive of claim 8, wherein the friction disc is a brake disc.

12. The final drive of claim 8, further comprising a conduit and a passage, wherein the conduit is positioned between the lubrication inlet and the passage, the conduit is substantially outside of the axle housing, the passage is positioned between the conduit and the lubrication outlet, and the passage is formed into the differential housing.

13. The final drive of claim 12, further comprising:

a first fitting positioned between the lubrication inlet and the conduit, and

a second fitting positioned between the conduit and the passage.

14. The final drive of claim 13, wherein the conduit is substantially outside of both the housing and the additional housing.

15. The final drive of claim 14, wherein the passage is drilled into the differential housing, and the lubrication outlet is cross drilled into the passage.

16. The final drive of claim 15, wherein:

the friction disc is a brake disc;

the lubricant ring travels about the outboard side of the friction disc;

the lubrication inlet is disposed on the outboard side of the friction disc; and

the lubrication outlet is disposed in the differential housing.

17. A method for recirculating lubrication in a final drive, the final drive having an axle housing having an inner surface;

a differential housing in alignment with the axle housing, wherein the axle housing and the differential housing share a longitudinal axis;

a lubricant ring traveling about the inner surface, wherein the lubricant ring has a lubricant ring inner diameter;

a longitudinal axis region, wherein the longitudinal axis region is a region formed by the lubricant ring inner diameter about the longitudinal axis;

the method comprising the steps of;

capturing a portion of the lubricant ring; and

distributing the portion of the lubricant ring in a direction generally towards the longitudinal axis region.

18. The method of claim 17, wherein the final drive further comprises a lubrication inlet, a conduit, a passage, and a lubrication outlet, wherein the conduit is between the lubricant inlet and the passage, and the passage is between the conduit and the lubrication outlet, and the method further comprises the further step of channeling the lubricant through the conduit, the passage, and the lubrication outlet.