Thermostatic valve for connecting an automatic transmission with an oil cooler
First Claim
1. A thermostatic valve for connecting an automatic transmission with an oil cooler, comprising:
- (a) a valve housing defining a first inlet conduit for oil received from the transmission, a first outlet conduit for oil delivered to the oil cooler, a second inlet conduit for oil received from the oil cooler, a second outlet conduit for oil delivered to the transmission, and a central area communicating with said first inlet conduit, said first outlet conduit, said second inlet conduit and said second outlet conduit, and(b) a valve device disposed within the valve housing for controlling oil flow communication among said first inlet conduit, said first outlet conduit, said second inlet conduit and said second outlet conduit in dependence upon prevailing temperature of the oil and upon prevailing pressure of the oil, the valve device comprising;
(i) a single valve element disposed for sliding movement in said central area,(ii) a spring exerting a biasing force urging the valve element slidably in a first direction into a first position and being yieldable for permitting sliding movement of the valve element in an opposite displacement direction into a second position and a third position,(iii) a thermostatic actuating element for actuating sliding movement of the valve element in said displacement direction against the biasing force of the spring into the second position in dependence upon a predetermined prevailing oil temperature,(iv) wherein the slidable valve element in the first position thereof blocks oil flow communication between the first inlet conduit and the first outlet conduit and simultaneously establishes a first bypass for oil flow communication between the first inlet conduit and the second outlet conduit,(v) wherein the slidable valve element in the second position thereof opens oil flow communication between the first inlet conduit and the first outlet conduit and simultaneously blocks oil flow communication via the first bypass between the first inlet conduit and the second outlet conduit, and(vi) wherein the biasing force of the spring is selected to yield under a predetermined pressure prevailing in the oil, independently of the temperature of the oil, to further move the valve element in said displacement direction into said third position opening communication between the first inlet conduit and the first outlet conduit and simultaneously a second bypass is established for oil flow communication between the first inlet conduit and the second outlet conduit.
1 Assignment
0 Petitions
Accused Products
Abstract
In a thermostatic valve for connecting an automatic transmission with an oil cooler, wherein the connection between an inlet conduit 12 for oil coming from the transmission and an outlet conduit 13 to the oil cooler is released or blocked by valve slider element 22, which is actuated by a thermostatic actuating element 16, 17 and is spring-loaded by a restoring spring 21, the valve slider element 22 with the restoring spring 21 is designed as a pressure-control valve which, with the open connection between the inlet conduit 12 for oil coming from the transmission and the outlet conduit 13 to the oil cooler, opens a bypass conduit 24 when a predetermined pressure of the oil is exceeded.
28 Citations
5 Claims
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1. A thermostatic valve for connecting an automatic transmission with an oil cooler, comprising:
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(a) a valve housing defining a first inlet conduit for oil received from the transmission, a first outlet conduit for oil delivered to the oil cooler, a second inlet conduit for oil received from the oil cooler, a second outlet conduit for oil delivered to the transmission, and a central area communicating with said first inlet conduit, said first outlet conduit, said second inlet conduit and said second outlet conduit, and (b) a valve device disposed within the valve housing for controlling oil flow communication among said first inlet conduit, said first outlet conduit, said second inlet conduit and said second outlet conduit in dependence upon prevailing temperature of the oil and upon prevailing pressure of the oil, the valve device comprising; (i) a single valve element disposed for sliding movement in said central area, (ii) a spring exerting a biasing force urging the valve element slidably in a first direction into a first position and being yieldable for permitting sliding movement of the valve element in an opposite displacement direction into a second position and a third position, (iii) a thermostatic actuating element for actuating sliding movement of the valve element in said displacement direction against the biasing force of the spring into the second position in dependence upon a predetermined prevailing oil temperature, (iv) wherein the slidable valve element in the first position thereof blocks oil flow communication between the first inlet conduit and the first outlet conduit and simultaneously establishes a first bypass for oil flow communication between the first inlet conduit and the second outlet conduit, (v) wherein the slidable valve element in the second position thereof opens oil flow communication between the first inlet conduit and the first outlet conduit and simultaneously blocks oil flow communication via the first bypass between the first inlet conduit and the second outlet conduit, and (vi) wherein the biasing force of the spring is selected to yield under a predetermined pressure prevailing in the oil, independently of the temperature of the oil, to further move the valve element in said displacement direction into said third position opening communication between the first inlet conduit and the first outlet conduit and simultaneously a second bypass is established for oil flow communication between the first inlet conduit and the second outlet conduit. - View Dependent Claims (2, 3, 4, 5)
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Specification