VIBRATION EXCITER COMPRISING A HYDRAULIC DRIVE UNIT, AND A METHOD FOR MECHANICALLY GENERATING VIBRATIONS

摘要

The invention relates to a vibration exciter comprising a housing (1) in which a piston (2) serving as an exciter can move in a cylinder (4). Said piston can move in a linear reciprocating motion against the action of spring means which can be variably adjusted. The piston (2) is coupled to a driving piston (10, 12) of a hydraulic drive unit. Said driving piston can be actuated by a working pressure via a main control valve (40). The invention provides that a pilot valve (44) controls the main control valve (40), and that the pilot valve (44) is controlled according to the position of the piston (2).