Pneumatic linear drive for e.g. opening valve unit, in linear actuating direction, has gear transmitting auxiliary drive force to working piston such that auxiliary drive force and drive force are rectified for displacement of actuator

摘要

The drive (17) has a working piston (44) limiting a pneumatic working chamber (45), where drive force for translatory movement in an actuating direction (A) is transferred to the working piston by producing pneumatic pressure in the working chamber. An auxiliary working piston (57) partially limits the working chamber. A gear acts between the working piston and the auxiliary working piston for transmitting auxiliary drive force of the auxiliary working piston to the working piston such that the auxiliary drive force and the drive force are rectified for displacement of the actuator.