INTEGRATED PRESSURE RELIEF VALVE FOR HYDRAULIC TENSIONER

摘要

An integrated valve for a hydraulic tensioner includes a pressure relief valve with an integrated disk check valve surrounding the pressure relief valve. A hydraulic tensioner includes a housing with a bore and a hollow piston slidably received within the bore. A piston spring biases the piston in a direction toward a power transmission device. The tensioner also includes an integrated check valve in a body of the housing. The integrated check valve includes a pressure relief valve mechanism and a disk check valve mechanism surrounding a circumference of the pressure relief valve mechanism. The pressure relief valve mechanism permits transfer of pressurized fluid from a piston chamber formed by the hollow piston to the source of pressurized fluid and the check valve mechanism permits transfer of pressurized fluid from the source of pressurized fluid to the piston chamber.

主权项

1. An integrated check valve with pressure relief for a hydraulic tensioner, comprising:
a) a backflow pressure relief valve mechanism comprising:
a hollow pressure relief body defining a chamber, the pressure relief body having a first end with an aperture, a second end, and a length extending from a bottom portion, the bottom portion defining at least one hole;a valve member received in the first end of the chamber;a pressure relief retainer received in the second end of the chamber; anda first biasing member received in the chamber having a second end contacting the pressure relief retainer and a first end contacting the valve member, the first biasing member biasing the valve member to a position in which the valve member seals the aperture of the pressure relief body; and b) a forward flow check valve mechanism comprising:
a check valve retainer surrounding a portion of the length of the hollow pressure relief body comprising a retainer sidewall with through holes and a retainer top wall, wherein the check valve retainer defines a cavity between the pressure relief valve body and the check valve retainer;at least one disk check valve received within the cavity and extending along the retainer sidewall and a portion of the length of the pressure relief body; anda second biasing member received in the cavity and located between the disk check valve and the pressure relief body.