Check valve and integrated pressure relief valve controlled by a metallic band

A hydraulic tensioner for an endless loop, flexible, power transmission member for an internal combustion engine of a motor vehicle, comprising:

• a housing having a bore, the bore having an inner surface, the housing having an inlet in communication with a source of pressurized fluid;
• a hollow piston slidably received within the bore, the piston having an inner surface and an outer surface;
• a piston spring biasing the piston in a direction toward the power transmission device;
• a hydraulic pressure chamber formed between the inner surface of the bore, the inner surface of the hollow piston;
• and
• an integrated check valve in a body of the housing, comprising a pressure relief valve mechanism and a band check valve mechanism surrounding a circumference of the pressure relief valve mechanism;
• wherein the pressure relief valve mechanism permits transfer of pressurized fluid from the hydraulic pressure chamber to the source of pressurized fluid and the check valve mechanism permits transfer of pressurized fluid from the source of pressurized fluid to the hydraulic pressure chamber.

A band check valve assembly for a hydraulic tensioner, comprising:

• a hollow cylindrical inner valve body having a length extending from a bottom portion and comprising a cylindrical inner valve body sidewall defining at least one through hole, and an inner valve body top wall;
• a check valve retainer surrounding a portion of the length of the cylindrical inner valve body comprising a retainer sidewall and a retainer top wall defining through holes, wherein the check valve retainer defines a cavity between the cylindrical inner valve body and the retainer sidewall;
• and
• at least one band check valve received within the cavity and extending around an outside of the hollow cylindrical inner valve body between the retainer top wall and the bottom portion of the cylindrical inner valve body.

A hydraulic tensioner for an endless loop, flexible, power transmission member for an internal combustion engine of a motor vehicle, comprising:

• a housing having a bore, the bore having an inner surface, the housing having an inlet in communication with a source of pressurized fluid;
• a hollow piston slidably received within the bore, the piston having an inner surface and an outer surface;
• a piston spring biasing the piston in a direction toward the power transmission device;
• a hydraulic pressure chamber formed between the inner surface of the bore, the inner surface of the hollow piston;
• and
• a band check valve assembly in a body of the housing, comprising:
• a hollow cylindrical inner valve body having a length extending from a bottom portion and comprising a cylindrical inner valve body sidewall defining at least one through hole, and a inner valve body top wall;
• a check valve retainer surrounding a portion of the length of the cylindrical inner valve body comprising a retainer sidewall and a retainer top wall defining through holes, wherein the check valve retainer defines a cavity between the inner cylindrical inner valve body and the retainer sidewall;
• and
• at least one band check valve received within the cavity and extending around an outside of the hollow cylindrical inner valve body between the retainer top wall and the bottom portion of the cylindrical inner valve body.
• wherein the band check valve assembly permits transfer of pressurized fluid from the source of pressurized fluid to the hydraulic pressure chamber.