Patent ID: 6165090
Filing Date: 2000-12-26
Classification: F16H,Y10T

Abstract:
A hydraulic chain tensioner comprising:a housing having a bore, said bore defining a fluid chamber;a hollow piston slidably received within the bore and having an upper end, the upper end having an aperture;a spring biasing said hollow piston in a protruding direction from said bore;a check valve provided between the chamber and a source of pressurized fluid to permit fluid flow into the chamber while blocking flow in the reverse direction;a passage in the housing to connect the chamber with the source of pressurized fluid; anda vent having a plurality of rigid metal plates in side-by-side relationship, said metal plates having gaps therebetween to permit a flow of fluid to escape from said chamber when said fluid in said chamber is under high pressure condition, said vent being in the shape of a disc, said vent being positioned between said fluid chamber and said piston aperture.