Hydraulic servo automatic transmission friction brake band
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United States of America Patent
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-
May 19, 1998
Grant Date -
N/A
app pub date -
May 30, 1996
filing date -
Jun 3, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic servo for friction brakes of an automatic transmission comprises a cylinder (2) with a main piston (3) arranged therein, a smaller cylinder (8) to receive a smaller compensation piston (9), the smaller cylinder communicating with the pressure chamber (5) of the main piston (3) through an orifice (18) controlled by a ball valve (20). A stepped bore (22) connects the pressure chamber (5) to the compensation chamber (17). A stepped piston (23), located in the bore, forms a discharge control valve (24), which controls the discharge of pressure medium from the compensation chamber (17).
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