Composite piston i.e. position piston, for use in automated transmission for motor car, has seal lip established to elastic deformation with increase in pressure in pressure chamber such that seal lip partly closes leakage channel

摘要

The piston (9) has a sealing element (1) with a seal lip (3) made of polymer material and tied up at a range of a carrier (2) in order to seal a pressure chamber (7). The seal lip comprises a leakage channel (4) through which medium i.e. oil, flows from the pressure chamber into a space (8) at a periphery of the piston. The seal lip is established to an elastic deformation with increase in pressure in the pressure chamber such that the seal lip partly closes the leakage channel. The leakage channel includes width, which lies in a range between 0.2-1 mm.