VIBRATION EXCITER (VERSIONS) Russian patent published in 1999 - IPC

FIELD: vibration and vibration impact machines; construction engineering and mining industry; drive for reciprocating motion of various members of machines. SUBSTANCE: reversible valve with separate shut-off members is fitted on differential piston dividing the cavity of housing into two chambers. First chamber is used for receiving the working medium from supply source and second chamber is connected with first chamber and with atmosphere by means of passages provided in differential piston shutting-off the passage connecting the second chamber with atmosphere and opening the passage connecting both chambers at the end of forward stroke of differential piston due to engagement with end face of housing bounding the second chamber. Reversible valve shuts off the passage connecting both chambers and opens the passage connecting the second chamber with atmosphere at the end of back stroke of differential piston due to reduction of pressure of working medium in second chamber as compared with first one. Lateral surface of housing bounding the second chamber has holes for communicating this chamber with atmosphere at the end of back stroke of piston. According to first version, these holes are provided at similar distance from end face of housing; according to second version, these holes are located at different and lateral surface of housing is provided with gate having holes for matching with holes on lateral surface of housing at respective preset amplitude of vibration. EFFECT: simplified construction; extended field of application. 3 cl, 1 dwg