Hydraulic servo for friction coupling devices of automatic transmissions
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United States of America Patent
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-
Jun 28, 1988
Grant Date -
N/A
app pub date -
Apr 29, 1985
filing date -
May 2, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hydraulic servo for friction coupling devices of automatic transmissions, the hydraulic servo comprising: an annular drum including outer and inner cylinders and a side wall connecting the two cylinders together and mounted fixedly or rotatably within an automatic transmission case; an intermediate cylinder mounted concentrically in a predetermined position between the outer and inner cylinders of the drum; a return biasing means located between the intermediate and inner cylinders; and a connecting member securely connecting the return biasing means to a piston.
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