Patent ID: 9581177
Date: 2017-02-28
CPC Classifications: F15B,F16H

Claim:
1. A clutch transmission having a hydraulic circuit for cooling the clutch transmission, the hydraulic circuit comprising: at least one pump, at least one cooler arranged in a first conduit for cooling a hydraulic medium conveyed by the at least one pump, a bypass associated with the cooler and having a thermostatic bypass valve constructed as a 2/3-way valve having two ports and three switching positions, with the bypass having a second conduit branching off from the first conduit upstream of the cooler and a third conduit connected to the first conduit downstream of the cooler, wherein one of the two ports is connected to the second conduit upstream of the cooler and the other of the two ports is connected to the third conduit downstream of the cooler, and wherein the bypass valve is configured for movement by a spring force into a first switching position where the bypass is open, for movement from the first switching position against the spring force by a thermal element into a second switching position where the bypass is closed, and for movement from the second switching position against the spring force by a difference pressure into a third switching position where the bypass is open, and said thermal element arranged outside of the bypass valve, wherein the thermal element is formed as an expanding thermal element which increases in size with increasing temperature and which is connected via a link with a slider or rotary vane of the bypass valve.