Cylinder for automatic transmission
AssigneeJATCO Ltd
InventorShigeharu Mizuno
Life of this patent
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Abstract
In a structure for an automatic transmission wherein a brake is arranged in a casing, a hydraulic servomechanism for actuating the brake includes a cylinder, a piston, a return spring for biasing the piston and including an annular portion abutting on the piston and a plurality of leaf-spring portions protruding outward equiangularly from the outer periphery of the annular portion, and a plurality of pressing portions formed with the piston and abutting on the servomechanism through clearances between the leaf-spring portions of the return spring.
Claims5
A structure for an automatic transmission wherein a mechanism is arranged in a casing having an inner periphery formed with a spline, the structure comprising:
- a cylinder;
- a piston slidably arranged in the cylinder, the piston actuating the mechanism;
- a return spring that biases the piston, the return spring comprising an annular portion abutting on the piston and a plurality of leaf-spring portions protruding outward equiangularly from an outer periphery of the annular portion and having a front end which abuts on a stopper ring engaged with the spline of the casing;
- and
- a plurality of pressing portions formed with the piston, the pressing portions abutting on the mechanism through clearances between the leaf-spring portions of the return spring.
An automatic transmission, comprising:
- a casing having an inner periphery formed with a spline;
- a mechanism arranged in the casing;
- a cylinder;
- a piston slidably arranged in the cylinder, the piston actuating the mechanism;
- a return spring that biases the piston, the return spring comprising an annular portion abutting on the piston and a plurality of leaf-spring portions protruding outward equiangularly from an outer periphery of the annular portion and having a front end which abuts on a stopper ma engaged with the spline of the casing;
- and
- a plurality of pressing portions formed with the piston, the pressing portions abutting on the mechanism through clearances between the leaf-spring portions of the return spring.
A structure for an automatic transmission wherein a mechanism is arranged in a casing having an inner periphery formed with a spline, the structure comprising:
- a cylinder;
- a piston slidably arranged in the cylinder, the piston configured to actuate the mechanism;
- a return spring that biases the piston, the return spring comprising an annular portion abutting on the piston and a plurality of leaf-spring portions protruding outward equiangularly from an outer periphery of the annular portion and having a front end coupled to the spline of the casing, the return spring having a spring characteristic which is controlled by adjusting one of a width, a thickness, and an recessed area of each leaf-spring portion;
- and
- a plurality of pressing portions formed with the piston, the pressing portions abutting on the mechanism through clearances between the leaf-spring portions of the return spring.
Dependencies are inferred from the claim text.