Transmission lubrication system for towing and method

• US 20060054407A1
• Filed: 05/18/2005
• Published: 03/16/2006
• Est. Priority Date: 07/20/2004
• Status: Abandoned Application

• Current Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Wirth, Kirk L., Watson, William J III, Greenan, Edward J.
• Application Number:
  US11/131,559
• Publication Number:
  US 20060054407A1
• Time in Patent Office: Days
• US Class Current: 184/6.120
• 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 57/0442 for supply in case of failure, i.e. auxiliary supply
• 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 57/05 of chains

Abstract

A transmission lubrication system for a vehicle transmission includes a fluid collection chamber positioned to collect fluid thrown by a rotatable member within the transmission. Structure forming a flow passage extending from the fluid collection chamber is in fluid communication with a transmission component so that the collected fluid flows from the fluid collection chamber via the flow passage to the transmission component to lubricate the transmission component.

Claims

1. A transmission lubrication system for a vehicle with a transmission, the transmission lubrication system comprising:

a transmission component;

structure forming a fluid collection chamber positioned to collect fluid thrown by a rotatable member of the transmission; and

structure forming a flow passage extending from said fluid collection chamber and in fluid communication with said transmission component such that the collected fluid flows from said fluid collection chamber via said flow passage to said transmission component, thereby lubricating said transmission component.

2. The transmission lubrication system of claim 1, wherein the vehicle includes wheels and a power source for powering the transmission connected to the transmission, and the transmission lubrication system further comprising:

said rotatable member being operatively connected to the power source and to the wheels such that said rotatable member is rotatable by the power source when the power source powers the transmission and is rotatable by rotation of the wheels when the vehicle is being towed.

3. The transmission lubrication system of claim 2, wherein said transmission component is a bushing operatively connected to said rotatable member such that said bushing rotates when said rotatable member rotates during towing.

4. The transmission lubrication system of claim 2, wherein said rotatable member is one of an output chain and a gear.

5. The transmission lubrication system of claim 1, wherein the vehicle includes a power source, and the transmission lubrication system further comprising:

a valve mounted within said flow passage restricting flow within said flow passage when said power source is powering said vehicle and selectively openable to permit flow from said fluid collection chamber to said transmission component when said power source is not powering said vehicle.

6. The transmission lubrication system of claim 1, further comprising:

a branch passage extending from said flow passage and permitting fluid to flow from said flow passage to another transmission component via said branch passage.

7. The transmission lubrication system of claim 6, further comprising:

a check valve positioned in said branch passage and selectively operable to permit flow to said another transmission component via said branch passage when a predetermined level of pressure is present in said flow passage.

8. The transmission lubrication system of claim 7, wherein said valve in said branch passage is a spring-loaded ball check valve.

9. The transmission lubrication system of claim 1, wherein said fluid collection chamber includes a spill feature permitting collected fluid to spill out of said fluid collection chamber when a predetermined level of fluid is collected in said chamber.

10. The transmission lubrication system of claim 1, wherein the transmission includes a transmission case;

and

wherein said structure forming a flow passage is the transmission case.

11. A transmission for a vehicle having a power source and wheels, the transmission comprising:

a casing defining an interior space and configured to contain lubricating fluid within said interior space;

a rotatable member positionable within said interior space to be in contact with the lubricating fluid and operably connectable to the power source and to the wheels such that said rotatable member is rotatable by the power source when the power source powers the transmission and is rotatable by rotation of the wheels when the vehicle is being towed, wherein said rotatable member throws the lubricating fluid when said rotatable member is rotated by the wheels;

a transmission component; and

a fluid collection chamber positionable within said interior space in fluid communication with said transmission component and operable to collect the thrown lubricating fluid and communicate the fluid to said transmission component for lubrication thereof.

12. The transmission of claim 11, further comprising:

structure forming a flow passage extendable from said fluid collection chamber to communicate fluid from said fluid collection chamber to said transmission component when said fluid collection chamber is positioned within said interior space.

13. The transmission of claim 12, further comprising:

another transmission component;

a branch passage positionable to extend from said flow passage to permit fluid flow to flow from said flow passage to lubricate said another transmission component.

14. The transmission of claim 13, further comprising:

a check valve positionable in said branch passage and selectively openable to permit flow to said another transmission component via said branch passage when a predetermined level of fluid pressure is present in said flow passage.

15. The transmission of claim 11, wherein said casing forms a flow passage extendable from said fluid collection chamber to communicate fluid from said fluid collection chamber to said transmission component when said fluid collection chamber is positioned within said interior space.

16. The transmission of claim 15, further comprising:

a valve mountable within said flow passage and operable to restrict flow within said flow passage when said power source is powering said vehicle and selectively openable to permit flow within said flow passage when said power source is not powering said vehicle.

17. The transmission of claim 11, wherein said fluid collection chamber includes a spill feature configured to permit collected fluid to spill out of said fluid collection chamber when a predetermined level of fluid is collected in said chamber.

18. The transmission of claim 11, wherein said casing includes an extension positioned such that the projected lubricating fluid coats said extension and drips therefrom into said fluid collection chamber.

19. A method for lubricating a vehicle transmission containing lubricating fluid during towing of the vehicle, the method comprising:

towing the vehicle such that wheels on the vehicle rotate;

rotating a rotatable member located within the transmission through the lubricating fluid in response to the rotation of the wheels to throw the fluid within the transmission;

collecting the thrown fluid; and

directing the collected fluid onto a transmission component for lubrication thereof.

20. The method of claim 19, wherein the transmission includes a casing, and the method further comprising:

after said rotating step, coating the casing with the thrown fluid; and

dripping the thrown fluid from said coated casing such that the dripped fluid is collected.