Transmission专利检索-电液伺服作动器致动器机电学专利检索查询-专利查询网

Transmission

阅读：761发布：2024-01-14

专利汇可以提供Transmission专利检索，专利查询，专利分析的服务。并且An automatic transmission providing variable speed ratio and reverse drives between drive and driven shafts and including friction-engaging devices, in the form of friction clutches and brakes, for establishing the drives. The devices are operable by hydraulic servomotors, certain servomotors each having first and second pistons arranged in tandem, with the first piston being movable by hydraulic fluid to engage the associated friction device, the second piston being movable by hydraulic fluid to also move the first piston during the application of hydraulic fluid to the first piston to thereby substantially double the effective area of the pistons of the servomotor to provide additional increased pressure to the engaged friction device. The transmission also includes an hydraulic governor fixed to the driven shaft by a locking spring clamp connector positively holding and keying the governor to the shaft in a simple assembly operation and in a manner to insure sealing between fluid-passage ports in the shaft and in the governor body for transfer of activating hydraulic fluid.，下面是Transmission专利的具体信息内容。

权利要求

1. An hydraulic servomotor for use with an engageable friction device comprising an hydraulic cylinder having connecting large and small chambers, a first piston in said large chamber and axially movable therein to engage said friction device, a second piston in said small chamber and engaging said first piston device and axially movable in said small chamber to engage said friction device by means of said first piston, means for selectively supplying fluid to one or both of said chambers to actuate said first and second pistons and centrifugal valve assemblies in each of said pistons each operable to open under centrifugal force to prevent movement of said piston due to centrifugal force when said friction device is disengaged.

2. An hydraulic servomotor as defined in claim 1 wherein said pistons are annular members.

3. An hydraulic servomotor as defined in claim 1 wherein said friction device may be engaged with the force of the fluid supplied acting on one of said pistons or alternatively engaged with additional force by fluid supplied acting on both of said pistons.

4. An hydraulic servomotor as defined in claim 1 wherein said cylinder has radially spaced inner and outer walls and an end wall defining said small chamber; and said cylinder has a second outer wall spaced radially and axially of said first-mentioned outer wall, a second end wall axially spaced from said first-mentioned end wall, said second outer wall and end wall defining, with said first-mentioned inner wall, said large chamber.

5. An hydraulic servomotor as defined in claim 1 including a shaft extending axially through said cylinder, and a spring element surrounding said shaft and having one end fixed to said shaft and its other end engaging said first piston to move said first piston and thereby said second piston.

6. In a hydraulic servomotor as defined in claim 1 wherein said centrifugal valve assemblies in said first and second pistons have balls closing drain holes in said pistons during application of fluid under pressure in said pistons and operable by centrifugal force to move to open said drain holes upon release of pressure fluid in said pistons.

7. An hydraulic servomotor for use with an engageable friction device comprising an hydraulic cylinder having connecting first and second chambers, a first piston in said first chamber and axially movable therein to engage said friction device, a second piston in said second chamber engaging said first piston and axially movable in said second chamber to engage said friction device by means of said engagement with said first piston, and means for selectively supplying fluid to one or both of said chambers to actuate said first and second pistons, said first and second chambers being partly defined by a relatively nonmovable drum member mounted in said servomotor between said pistons, said first piston having a portion extending beyond said drum member and into contact with said second piston, a fluid seal being provided between said drum member and the axially extending portion of said first piston, said drum member having an axially exteNding portion upon which said second piston is slidable wherein said friction device may be engaged with the force of fluid supplied acting on said first piston or alternatively actuated with the fluid acting on said first piston, the force of the second piston being transmitted to said friction device by means of contact with said first piston.

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