DIY Knowledge

Rotating piston, slide-valve or cut-off valve motor

Lamellenmotor, Schieber-oder Trennschiebermotor

Motor sin válvulas

Moteur à chemise tiroir, et à vanne d'isolement

The most frequently used drive motor for air tools is known under several names. The motor consists of a stator with two bores, the air inlet and outlet bore. The rotor is eccentrically arranged inside the stator. It has long slots which house the rotating pistons. The stator is sealed off on both sides by sealing plates with the rotor bearing. The special rotor arrangement creates a sickle-shaped space which is subdivided by the free-moving lamellae into individual chambers. These slide valves are either pushed against the cylinder wall by centrifugal force thus sealing the chamber, or they are blown under. In large tools they are moved by springs.

The compressed air admitted through the intake passage is forced against the chambers and causes the rotor to rotate. The large-surface air outlet bore starts where the sickle-shaped work area becomes narrow again. The rotating piston motor is similar in operating behaviour to the universal motor in some aspects, but in contrast to the universal motor it can be operated up to stalling without damaging the motor. Standstill wrenches use a blocking method.