Hydraulic control of transmission
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 28, 1988
Grant Date -
N/A
app pub date -
Jan 17, 1986
filing date -
Jan 19, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fluid pressure actuator for a frictionally engaged unit of a vehicular transmission includes a first transmission and a second transmission coupled to the output side of the first transmission and provided with a speed step change mechanism which has a frictionally engaging element for engaging a rotary member to a fixed member in such a manner as to enable an optional disengagement between the rotary member and the fixed member. The fluid pressure actuator further has an annular cylinder for operating the frictionally engaging element and has an outer annular portion and an inner annular portion provided inside the outer annular portion coaxially therewith, an annular piston including an outer annular portion slidably fitted to the outer annular portion of the cylinder and an inner annular portion slidably fitted to the inner annular portion of the cylinder, an outer cylinder chamber defined by the outer annular portions of the cylinder and the piston, and an inner cylinder chamber defined by the inner annular portions of the cylinder and the piston and connected to the outer cylinder chamber through an orifice through which working oil is supplied to one of the cylinder chambers. A one-way valve is provided in one of the annular portions of the cylinder for causing external air to be drawn into the one oil chamber.
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