| 摘要 |
An accumulator structure for use in a hydraulic control system for controlling an hydraulic motor utilized to engage a friction device in a transmission including an accumulator piston mounted in a housing, a source of fluid pressure, a valve connected between the source and the motor. A first conduit connects the valve and motor, the first conduit including a fluid restriction, and a second conduit connects the valve and the accumulator. A third conduit is provided between the accumulator and the first conduit. The accumulator includes a counter-bored portion defining together with a reduced land portion on said piston, a passage which connects the second conduit to the third conduit when the piston is in the inactive position to provide a rapid fluid fill of the motor initially. The land on the piston blocks the connection between the second and third conduits when the piston is moving between the inactive and fully "stroked" positions, and a flow path is provided in the accumulator to connect the second conduit to the third conduit again when the piston reaches its fully "stroked" position whereby in case of a leak of pressure at the servomotor, the connection between the second and third conduits will provide sufficient fluid flow to prevent a pressure drop at the hydraulic motor caused by the restriction in the first conduit under the leak condition such that sufficient engaging force is maintained to prevent slipping of the friction device. |
