Oil cooler bypass valve

• US 6,719,208 B2
• Filed: 12/27/2002
• Issued: 04/13/2004
• Est. Priority Date: 08/31/2001
• Status: Expired due to Fees

• Current Assignee: Huron, Inc.
• Original Assignee: Huron, Inc.
• Inventors: Brown, Lanny D.
• Primary Examiner(s): Tapolcal, William E.
• Assistant Examiner(s): Ali, Mohammad M.
• Application Number:
  US10/330,695
• Publication Number:
  US 20030136855A1
• Time in Patent Office: 473 Days
• Field of Search: 236/34.5, 236/34, 236/99.K, 236/93.A, 236/93.R, 236/36, 165/35, 165/38, 165/40, 137/625.5
• US Class Current: 236/34.5
• CPC Class Codes: F01M 5/007 Thermostatic control
• CPC Class Codes: F01P 2060/04 Lubricant cooler
• CPC Class Codes: F01P 2060/045 for transmissions
• CPC Class Codes: F01P 7/16 by thermostatic control
• CPC Class Codes: F16H 57/04 Features relating to lubrication or cooling or heatingin hydrokinetic gearing F16H41/30; control of lubrication or cooling in hydrostatic gearing F16H61/4165
• CPC Class Codes: F16H 57/0413 Controlled cooling or heating of lubricant; Temperature control therefor
• CPC Class Codes: G05D 23/1333 measuring the temperature of incoming fluid

Abstract

A valve actuating mechanism for a transmission/engine fluid cooler bypass valve of the type in which a responsive element expands to urge a valve member against a valve seat and thereby causes transmission fluid to flow through an oil fluid cooler. A cast valve housing is utilized which is interposed between the cooler and the oil source. The valve actuating mechanism is designed to allow fluid to pass through the valve once the fluid has reached an elevated temperature.

Claims

1. A transmission fluid bypass valve configured to be incorporated into a transmission case, the transmission case defining a bore for accepting the bypass valve and having fluid supply lines coupled to the bore, said valve comprising:

a valve housing defining a threaded outer body configured to mate with the bore, an elongated passage defining a bypass orifice defining a first valve seat, said bypass elongated communicating with the fluid supply, fluid return, cooler supply;

a valve bearing element which is engageable with the valve seat having a closed position for directing oil from the fluid supply line to the cooler supply for circulating oil through a cooler, and further having an open position for directing fluid from the fluid supply through the bypass orifice into the transmission;

a thermally responsive actuator which moves the valve bearing element between the open and closed positions; and

a spring disposed between the valve bearing element and said valve housing and operable to urge the valve bearing away from said first valve seat.

2. The fluid bypass valve of claim 1 wherein said valve housing defines a second outer surface having an exterior diameter smaller than the exterior diameter of the threaded surface, the second outer surface configured to define a cavity with an interior surface of the bore.

3. The fluid bypass valve of claim 2 wherein the thermally responsive actuator further comprises an annularly disposed star flange.

4. The fluid bypass valve of claim 1 further comprising a star washer configured to restrain the thermally responsive element within the elongated passage.

5. The fluid bypass valve of claim 1 wherein the bypass passage comprises a coupling configured to fluidly couple the valve housing to an oil cooler.

6. The fluid bypass valve of claim 1 wherein the valve housing defines a plurality of flat surfaces.

7. The fluid bypass valve of claim 1 comprising a pair of star washers within the elongated passage, the star washers being configured to restrain a portion of the thermally actuated element.

8. The fluid bypass valve of claim 1 wherein the cavity is fluidly coupled to a flow passage defined within the valve body.

9. The fluid bypass valve of claim 1 wherein the valve housing defines an orifice which fluidly couples the cavity to the elongated passage.

10. The fluid bypass valve of claim 1 wherein the thermally actuated element is disposed within a flow passage within the elongated passage.

11. The fluid bypass valve of claim 1 further comprising a snap ring configured to restrain the thermally activated element within the elongated passage.

12. The fluid bypass valve according to claim 1 further comprising a star washer disposed between the valve bearing element and the thermally responsive actuator.

13. The fluid bypass valve according to claim 12 further comprising a biasing spring disposed between the valve bearing element and the valve housing.

14. A bypass valve configured to be incorporated into a bore within a body of a machine, the bore defining a fluid supply orifice coupled to a fluid supply and a first return orifice coupled to a first fluid return, the bypass valve comprising:

a valve housing defining an outer surface configured to be mated to a surface within the bore;

an elongated passage defining a bypass orifice and a valve seat, the elongated passage fluidly coupled to the fluid supply and the first fluid return, and a second fluid return;

a valve bearing element disposed within the elongated passage, the valve bearing element being engageable with the valve seat so as to place the valve in a closed position which directs oil from the fluid supply to the second return, the valve bearing element allowing fluid to flow from the fluid supply to a first fluid return when the valve beating element is not engaged with the valve seat; and

a thermally responsive actuator disposed within the elongated passage, the thermally responsive element being coupled to the valve bearing element within the elongated passage configured to restrain movement of the thermally actuated member.

15. A bypass valve configured to be incorporated into a bore within a body of a machine, the bore defining a fluid supply orifice coupled to a fluid supply and a first return orifice coupled to a first fluid return, the bypass valve comprising:

a valve housing defining an outer surface configured to be mated to a surface within the bore;

an elongated passage defining a bypass orifice and a valve seat, the elongated passage fluidly coupled to the fluid supply and the first fluid return, and a second fluid return;

a valve bearing element disposed within the elongated passage, the valve bearing element being engageable with the valve seat so as to place the valve in a closed position which directs oil from the fluid supply to the second return, the valve bearing element allowing fluid to flow from the fluid supply to a first fluid return when the valve beating element is not engaged with the valve seat; and

a thermally responsive actuator disposed within the elongated passage, the thermally responsive element being coupled to the valve bearing element wherein said valve housing defines a second outer surface having an exterior diameter smaller than the exterior diameter of the outer surface, the second outer surface configured to define a cavity with an inner surface of the bore.

16. A bypass valve configured to be incorporated into a bore within a body of a machine, the bore defining a fluid supply orifice coupled to a fluid supply and a first return orifice coupled to a first fluid return, the bypass valve comprising:

a valve housing defining an outer surface configured to be mated to a surface within the bore;

an elongated passage defining a bypass orifice and a valve seat, the elongated passage fluidly coupled to the fluid supply and the first fluid return, and a second fluid return;

a valve bearing element disposed within the elongated passage, the valve bearing element being engageable with the valve seat so as to place the valve in a closed position which directs oil from the fluid supply to the second return, the valve bearing element allowing fluid to flow from the fluid supply to a first fluid return when the valve beating element is not engaged with the valve seat; and

a thermally responsive actuator disposed within the elongated passage, the thermally responsive element being coupled to the valve bearing element wherein the cavity is fluidly coupled to a flow passage defined within the valve body.