Hydraulic tensioner with a hydraulically controlled rack

摘要

A hydraulic tensioner having a hydraulically actuated rack member. A pair of check valves (214,230) permit fluid to flow from an external source (224) of pressurized fluid into a fluid chamber (208). The two check valves form a substantially fluid tight chamber in order to provide sufficient pressure to prevent the piston (200) from retracting upon deenergization of the source of pressurized fluid.