IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0560680
(1983-12-12)
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발명자
/ 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
15 인용 특허 :
2 |
초록
▼
The present cooling system provides a limited flow rate to the clutches during disengagement and provides additional cooling flow to the clutches during partial engagement and controls the pressure level of the fluid from the source of cooling fluid by operation of a valve mechanism which is respons
The present cooling system provides a limited flow rate to the clutches during disengagement and provides additional cooling flow to the clutches during partial engagement and controls the pressure level of the fluid from the source of cooling fluid by operation of a valve mechanism which is responsive to a control mechanism. Upon full engagement, the valve mechanism automatically reduces the volume of cooling fluid to the clutches and simultaneously reduces the pressure level of the cooling flow from the source of cooling fluid. This cooling system provides the needed volume of cooling fluid during partial engagement of the clutches and also reduces the volume of cooling fluid during disengagement to reduce drag forces while further reducing the volume of cooling fluid during full engagement to conserve horsepower.
대표청구항
▼
1. In a friction couple cooling system including a source of pressurized control fluid, a source of cooling fluid, a fluid pathway through the friction couple, and an actuator for actuating the friction couple, the improvement comprising: valve means for continuously directing a predetermined vol
1. In a friction couple cooling system including a source of pressurized control fluid, a source of cooling fluid, a fluid pathway through the friction couple, and an actuator for actuating the friction couple, the improvement comprising: valve means for continuously directing a predetermined volume of cooling fluid to said fluid pathway during disengagement and full engagement of the friction couple and for increasing the pressure of the cooling fluid delivered to said fluid pathway and increasing the volume of cooling fluid to said fluid pathway only during partial engagement of said friction couple, and control means for controlling actuation of said friction couple and for controlling actuation of said valve means during partial engagement of said friciton couple. 2. The cooling system, as set forth in claim 1, wherein said control means includes a variable pressure reducing valve connected to said source of pressurized control fluid, a latching mechanism associated with the variable pressure reducing valve and adapted to vary the operating pressure of the reducing valve in response to movement of the latching mechanism. 3. The cooling system, as set forth in claim 2, wherein said latching mechanism includes a housing defining a bore therein, a piston slidably disposed in the bore, the piston having rods extending through the housing with one rod at one end of the piston contacting a control spring of the pressure reducing valve, the piston being movable between a first, spring biased position at which said control spring of said reducing valve is at a minimum force and a second position at which said control spring is at a maximum force, and a pressure chamber being defined in the bore at the other end of the piston and being adapted to communicate with the source of pressurized control fluid at the second position of the piston to hold the piston at said second position. 4. The cooling system, as set forth in claim 1, wherein said valve means includes a relief valve adapted to control the pressure of the fluid from the source of cooling fluid in response to said friction couple being operated during said partial engagement. 5. The cooling system, as set forth in claim 4, wherein said valve means includes a valving element movable between a first, spring biased position at which said increased volume of fluid to said fluid pathway is blocked and a second position at which said increased volume of fluid is passed therethrough, said valving element being movable to said second position in response to said friction couple being operated during said partial engagement. 6. The cooling system, as set forth in claim 5, wherein said cooling system includes a second friction couple adapted to operate between disengagement, partial engagement, and full engagement and having a fluid pathway therethrough, and said valve means includes a second valving element movable between a first, spring biased position at which said increased volume of fluid to the fluid pathway of the second friction couple is blocked and a second position at which said increased volume of fluid is passed therethrough, said second valving element being movable to said second position in response to said second friction couple being operated only during said partial engagement. 7. The cooling system, as set forth in claim 6, wherein said control means includes a variable pressure reducing valve connected to said source of pressurized control fluid, a latching mechanism operatively associated with the variable pressure reducing valve and adapted to vary the operating pressure of the reducing valve in response to movement of the latching mechanism. 8. The cooling system, as set forth in claim 7, wherein said latching mechanism includes a housing defining a bore therein, a piston slidably disposed in the bore, the piston having rods extending through the housing with one rod at one end of the piston contacting a control spring of the pressure reducing valve, the piston being movable between a first, spring biased position at which said control spring of said reducing valve is at a minimum force and a second position at which said control spring is at a maximum force, and a pressure chamber being defined in the bore at the other end of the piston and being adapted to communicate with the source of pressurized control fluid at the second position of the piston to hold the piston at said second position. 9. The cooling system, as set forth in claim 8, wherein the control means includes an input member connected to the other rod of the piston of the latching mechanism and a switching valve adapted to selectively direct the pressurized fluid from the pressure reducing valve to the first and second valving elements, said switching valve being movable in response to the operating position of said input member. 10. The cooling system, as set forth in claim 9, wherein the control means includes a conduit connected between the pressure chamber of the latching mechanism and the first and second valving elements of the valve means and adapted to communicate pressurized control fluid from the pressure chamber to the first and second valving elements when said piston of the latching mechanism is at said second position. 11. The cooling system as set forth in claim 10, including a lubrication system connected to said valve means, and wherein said valve means includes a housing having first and second bores defined therein, an inlet port in communication with the first and second bores and connected to the source of cooling fluid, first and second outlet ports respectively in communication with the first and second bores and connected to said fluid pathways of said first and second friction couples, a third outlet port in communication with the first and second bores and connected to said lubrication system, first and second control ports respectively connected to one end of each of the bores and to the switching valve, and a third control port connected to the other end of each of the bores and to the pressure chamber by said conduit, said first and second valving elements being slidably disposed in the respective first and second bores. 12. The cooling system, as set forth in claim 11, wherein the cooling system is adapted for use in a vehicle having an engine, a high-low clutch assembly having the friction couples located therein and a transmission having clutches and controls therefor, said transmission controls being connected to said source of pressurized control fluid, and said first and second valving elements being further biased to their first position in response to either of the friction couples being fully engaged. 13. The cooling system, as set forth in claim 12, wherein the control means includes a conduit connected between the pressure chamber of the latching mechanism and the first and second valving elements of the valve means and adapted to communicate pressurized control fluid from the pressure chamber to the first and second valving elements when said piston of the latching mechanism is at said second position. 14. The cooling system, as set forth in claim 13, including a control panel defining a U-shaped slot, an input member connected to the other rod of the piston of the latching mechanism and being movably positioned in said slot and movement of the input member in each of the legs of the U-shaped slot controls the movement of the piston of the latching mechanism. 15. The cooling system, as set forth in claim 14, including a sensing element located in one of the legs of the U-shaped slot and adapted to actuate said switching valve in response to movement of the input member within the one leg of the U-shaped slot. 16. The cooling system, as set forth in claim 15, including a solenoid operated valve connected between the source of pressurized control fluid and the switching valve and being movable to a position to actuate the switching valve in response to the input member being operated within the one leg of the U-shaped slot.
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