Rotary actuator, a rotary actuator in a motor vehicle suspension, and a method of mass producing rotary actuators

摘要

A rotary actuator has a cylinder and a motor shaft as well as end caps which define a working area. A number of ribs extend from the inside wall surface of the cylinder and an equal number of vanes extend from the outside shell surface of the motor shaft. The ribs and vanes divide the working area into working chambers which are alternately supplied with hydraulic medium. Seals are disposed in grooves in the ribs and the vanes, which seals are braced between the inside wall surface of the cylinder or the outside shell surface of the motor shaft and the respective groove base, so that the seals hydraulically separate the working chambers from one another. The outside shell surface of the motor shaft and the inside wall surface of the cylinder are designed with recesses, so that the prestress on the seals is neutralized in at least one installation position of the motor shaft. The rotary actuator can be used in a stabilizer bar of a motor vehicle suspension system. The recesses make assembly of the actuator conducive to a method of mass production.