Hydraulic tensioner with a pressure relief valve

摘要

A hydraulic tensioner having a plunger slidably fitted in a cavity in a housing and biased in a protruding direction by a spring and fluid. A check valve permits fluid to only flow into, and thereby protrude the plunger, but not out of the cavity. A pressure relief valve is mounted on the housing and is in communication with the cavity. The relief valve includes a flat spring member applying a preload against a reed valve to seal an exhaust passageway connecting to the cavity.