Multiple path fluid flow architecture for transmission cooling and lubrication

• US 20070000728A1
• Filed: 06/30/2005
• Published: 01/04/2007
• Est. Priority Date: 06/30/2005
• Status: Abandoned Application

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Kiefer, Jean-Daniel, Pignard, Frederic
• Application Number:
  US11/171,644
• Publication Number:
  US 20070000728A1
• Time in Patent Office: Days
• US Class Current: 184/6.120
• CPC Class Codes: F16H 57/0413 Controlled cooling or heating of lubricant; Temperature control therefor
• CPC Class Codes: F16H 57/0415 Air cooling or ventilation; Heat exchangers; Thermal insulations
• CPC Class Codes: F16H 57/0434 relating to lubrication supply, e.g. pumps arrangement of pumps F16H57/0441; Pressure control grooves with pumping effect for supplying lubricant F16H57/0428; generation and variation of line pressure for transmission control F16H61/0021
• CPC Class Codes: F16H 61/14 Control of torque converter lock-up clutches

Abstract

The apparatus of the present invention provides a multiple path fluid flow architecture for cooling and lubricating an automatic transmission. More precisely, the apparatus of the present invention is adapted provide a first flow rate of transmission fluid to meet the transmission cooling requirements, and a second reduced flow rate of transmission fluid adapted to meet the transmission lubrication requirements. In this manner, a high flow rate may be provided to cool the transmission and a reduced flow rate may be provided to lubricate the transmission such that the cooling capacity of the system is increased without reducing the efficiency of the transmission.

Claims

1. A transmission cooling and lubrication system comprising:

a cooler channel adapted to transmit transmission fluid therethrough such that the heat generated by the transmission during the operation thereof is absorbed by the transmission fluid to cool the transmission;

a first path in fluid communication with said cooler channel wherein said first path is adapted to receive a first portion of the transmission fluid exiting from the cooler channel;

a lubrication channel in fluid communication with said first path wherein said lubrication channel is adapted to receive said first portion of the transmission fluid to lubricate the transmission; and

a second path in fluid communication with said cooler channel wherein said second path is adapted to receive a second portion of the transmission fluid exiting from the cooler channel;

wherein a first flow rate of transmission fluid provided through said cooler channel to cool the transmission is greater than a second flow rate of transmission fluid provided through said lubrication channel to lubricate the transmission such that a cooling capacity of the transmission cooling and lubrication system is increased without reducing the efficiency of the transmission.

2. The transmission cooling and lubrication system of claim 1 further comprising a pump in fluid communication with said cooler channel, said pump being configured to circulate said transmission fluid through the transmission cooling and lubrication system.

3. The transmission cooling and lubrication system of claim 2 further comprising a sump in fluid communication with said pump, said first path, and said second path, said sump being configured to store said transmission fluid.

4. The transmission cooling and lubrication system of claim 3 further comprising a heat exchanger in fluid communication with said cooler channel, said first path, and said second path, said heat exchanger being configured to cool said transmission fluid.

5. The transmission cooling and lubrication system of claim 4 further comprising a leak orifice in fluid communication with said second path and said sump.

6. The transmission cooling and lubrication system of claim 5 further comprising a flow balance orifice in fluid communication with said first path and said lubrication channel, said flow balance orifice being configured to regulate the amount of transmission fluid transferred through the first path and the second path.

7. The transmission cooling and lubrication system of claim 6 wherein the cooler channel includes a main pressure regulation valve in fluid communication with said pump.

8. The transmission cooling and lubrication system of claim 7 wherein the cooler channel includes a pressure limit valve in fluid communication with said main pressure regulation valve.

9. The transmission cooling and lubrication system of claim 8 wherein the cooler channel includes a torque converter clutch control valve in fluid communication with said pressure limit valve.

10. A transmission cooling and lubrication system comprising:

a sump;

a pump adapted to draw transmission fluid from the sump;

a cooler channel in fluid communication with the pump and adapted to receive transmission fluid therefrom such that the heat generated by the transmission during the operation thereof is absorbed by the transmission fluid to cool the transmission;

a heat exchanger in fluid communication with the cooler channel adapted to cool the transmission fluid;

a first path in fluid communication with said heat exchanger wherein said first path is adapted to receive a first portion of the transmission fluid exiting from the heat exchanger;

a lubrication channel in fluid communication with said first path wherein said lubrication channel is adapted to receive said first portion of the transmission fluid to lubricate the transmission; and

a second path in fluid communication with said heat exchanger wherein said second path is adapted to receive a second portion of the transmission fluid exiting from the heat exchanger;

wherein a first flow rate of transmission fluid provided through said cooler channel to cool the transmission is greater than a second flow rate of transmission fluid provided through said lubrication channel to lubricate the transmission such that a cooling capacity of the transmission cooling and lubrication system is increased without reducing the efficiency of the transmission.

11. The transmission cooling and lubrication system of claim 10 further comprising a leak orifice in fluid communication with said second path and said sump.

12. The transmission cooling and lubrication system of claim 11 further comprising a flow balance orifice in fluid communication with said first path and said lubrication channel, said flow balance orifice being configured to regulate the amount of transmission fluid transferred through the first path and the second path.

13. The transmission cooling and lubrication system of claim 12 wherein the cooler channel includes a main pressure regulation valve in fluid communication with said pump.

14. The transmission cooling and lubrication system of claim 13 wherein the cooler channel includes a pressure limit valve in fluid communication with said main pressure regulation valve.

15. The transmission cooling and lubrication system of claim 14 wherein the cooler channel includes a torque converter clutch control valve in fluid communication with said pressure limit valve.

16. A transmission cooling and lubrication system comprising:

a sump;

a pump adapted to draw transmission fluid from the sump;

a cooler channel in fluid communication with the pump and adapted to receive transmission fluid therefrom such that the heat generated by the transmission during the operation thereof is absorbed by the transmission fluid to cool the transmission;

a heat exchanger in fluid communication with the cooler channel adapted to cool the transmission fluid;

a first path in fluid communication with said heat exchanger wherein said first path is adapted to receive a first portion of the transmission fluid exiting from the heat exchanger;

a flow balance orifice in fluid communication with said first path;

a lubrication channel in fluid communication with said flow balance orifice, wherein said lubrication channel is adapted to receive said first portion of the transmission fluid from the heat exchanger to lubricate the transmission;

a second path in fluid communication with said heat exchanger wherein said second path is adapted to receive a second portion of the transmission fluid exiting from the heat exchanger; and

a leak orifice in fluid communication with said second path and said sump;

wherein a first flow rate of transmission fluid provided through said cooler channel to cool the transmission is greater than a second flow rate of transmission fluid provided through said lubrication channel to lubricate the transmission such that a cooling capacity of the transmission cooling and lubrication system is increased without reducing the efficiency of the transmission.

17. The transmission cooling and lubrication system of claim 16 wherein the cooler channel includes a main pressure regulation valve in fluid communication with said pump.

18. The transmission cooling and lubrication system of claim 17 wherein the cooler channel includes a pressure limit valve in fluid communication with said main pressure regulation valve.

19. The transmission cooling and lubrication system of claim 18 wherein the cooler channel includes a torque converter clutch control valve in fluid communication with said pressure limit valve.