Imbalance-oscillation exciter

Abstract

An imbalance oscillation exciter having two imbalance weights arranged on each of two axially parallel or coaxial imbalance-weight carriers positively rotatably coupled with one another and rotating counter to each other or in the same direction. At least one of these imbalance-weight carriers comprises a shaft, whereby the imbalance-weight carriers are coupled with each other by a hub for continuous opposite rotation for the purpose of changing the phase position of the imbalance weights. A pin fixed on the shaft slidably engages in a hub groove. The pin is shiftable along a shaft slot extending at an incline to the hub groove by means of an adjustment member arranged coaxially in the shaft. The shaft has an axially parallel cylinder chamber open toward one of its end faces and in which the adjustment member is slidable with a piston extension sealed with respect thereto and facing the open side of the cylinder chamber. Pressure medium is supplied from the open side by way of a pressure medium chamber fixed in the housing and sealingly surrounding the pertaining shaft end and being applied against the mechanical back or reaction pressure of the piston extension. The rise or angle of inclination between the hub groove and the shaft slot, the direction of inclination, and the direction of rotation of the shaft may be so matched or adapted with respect to each other that the back or reaction pressure results from the torque transmitted by the pin.