Automatic transmission
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United States of America Patent
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-
Jul 24, 2007
Grant Date -
Sep 29, 2005
app pub date -
Mar 15, 2005
filing date -
Mar 24, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A forward/reverse change-over mechanism (3) of an automatic transmission comprises a forward clutch (5) inside a drum (7) with the base (7c) which rotates together with an input shaft (1). The forward clutch (5) engages by driving a piston (9) housed in the drum (7) by the oil pressure of an oil chamber (10) between a base (7c) and the piston (9). Projecting bearings (16) which seat the piston (9) are formed by press-forming at equal angular intervals concentrically with the axial center of the drum (7) in the base (7c). By installing a sensor body (18) which responds to the passage of depressions (17) formed underneath the bearings (16), the forward/reverse change-over mechanism (3) can be made compact and manufactured with a small number of parts and machining steps.
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