Patent ID: 6454206
Filing Date: 2002-09-24
Classification: F16F,Y10S

Abstract:
A damping apparatus for damping vibrations in a vibrating system including a piston which is reciprocally movable in a fluid filled chamber, piston movement in either direction of movement being resisted by fluid pressure in the chamber on one side of the piston, which resistance provides damping forces which act to oppose piston movement, the piston being connected to one component of the vibrating system and the chamber being connected to a second component of the vibrating system, said damping apparatus further comprising a fluid pressure relief device for relieving the fluid pressure on the piston during movement thereof so as to allow substantially unopposed piston movement in the chamber without damping forces being provided during piston movements which occur in response to vibrations in the vibrating system at frequencies other than a fundamental frequency which the damping apparatus primarily is intended to damp, the fluid pressure relief device including a fluid by-pass conduit and a fluid control device which controls the flow of fluid through the fluid by-pass conduit depending on the direction of the velocity of the fundamental frequency vibrations to be damped.