Clutch actuator

Abstract

The invention provides a clutch actuator. The clutch actuator comprises a shell, pistons, driving mechanisms and transmission mechanisms. Pressure cavities are formed in the shell. The driving mechanisms are connected with the pistons through the transmission mechanisms. The transmission mechanisms are used for transforming rotary movement of the driving mechanisms into rectilinear movement so that the pistons can be driven to move axially in the shell and pressure can be applied to a pressure medium with which the pressure cavities are filled. Each driving mechanism comprises a stator and a rotor. Each transmission mechanism comprises a planetary roller screw rod, a bearing and a limiting block. Each planetary roller screw rod comprises a screw rod and a nut. One end of each screw rod isconnected with a corresponding piston, and the other end of each screw rod is connected with the corresponding limiting block. A guide hole is formed in the shell or each stator. Each limiting block is arranged in the guide hole in a manner that each limiting block is capable of axial movement but non-rotatable. Each nut is located between the corresponding piston and limiting block and connectedwith the corresponding rotor and can rotate following the corresponding rotor. Each bearing is fixedly installed in the shell and arranged outside the corresponding nut in a sleeving manner. Accordingto the clutch actuator, the structure is compact, the weight is light, and the clutch actuator is easy to assemble.

Description

technical field [0001] The present invention relates to clutches for automobiles. Background technique [0002] Existing clutch actuators for automotive gearboxes have a master cylinder with a housing and an axially displaceable piston in the housing that acts upon a pressure chamber filled with pressure medium, the piston being driven by a stator The motor and the rotor are driven in rotation by means of a planetary roller transmission that converts the rotary drive into axial motion. Wherein, the pressure chamber is arranged in an annular shape, and the piston is arranged in a "cup shape" so that it can move in the annular pressure chamber to generate hydraulic pressure. The planetary roller gear is received centrally in the radial interior of the pressure chamber, while the main shaft of the planetary roller gear driven by the electric motor is supported at the end of the main shaft relative to the housing by means of a single radial bearing , the main shaft is directly...

AI Technical Summary

Problems solved by technology

[0005] 2. In the above-mentioned technical solution, the supplementary cavity and the oil storage cavity are arranged on the casing in a two-piece manner. In this case, the structure of the product will be complicated, and an assembly process will be added at the same time, which will increase the production cycle and manufacturing cost;

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