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US 2019/0338836 A1Published application
Pressure activated metallic band piston seal
AssigneeBorgWarner Inc.
InventorsJeremy BENN, Seongdo HONG
Life of this patent
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AssigneeBorgWarner Inc.
InventorsJeremy BENN, Seongdo HONG
Estimating the term…
This invention pertains to the field of hydraulic tensioners. A hydraulic tensioner of this invention includes a tensioner body having a bore in fluid communication with a source of pressurized fluid through an inlet, a hollow piston slidably received within the bore and having an outer diameter, a hydraulic pressure chamber defined by the hollow piston and the bore of the tensioner body, a piston spring received within the hydraulic pressure chamber for biasing the piston away from the inlet, and a metallic band surrounding the outer diameter of the piston. The metallic band forms a seal between an outer surface of the piston and the tensioner body when pressure builds in the hydraulic pressure chamber, wherein metallic bands or seals are placed over a hydraulic tensioner piston in order to seal the high pressure chamber and prevent or reduce leakage through the clearance between the piston and the tensioner body.
A hydraulic tensioner, comprising:
A pressure activated metallic seal for a hydraulic tensioner comprising a tensioner body having a bore in fluid communication with a source of pressurized fluid through an inlet, a hollow piston slidably received within the bore and having an outer diameter, a hydraulic pressure chamber defined by the hollow piston and the bore of the tensioner body, and a piston spring received within the hydraulic pressure chamber for biasing the piston away from the inlet, comprising:
A method of reducing leakage between a piston and a tensioner body in a hydraulic tensioner comprising a tensioner body having a bore in fluid communication with a source of pressurized fluid through an inlet, a hollow piston slidably received within the bore and having an outer diameter, a hydraulic pressure chamber defined by the hollow piston and the bore of the tensioner body, a piston spring received within the hydraulic pressure chamber for biasing the piston away from the inlet, and a metallic band surrounding the outer diameter of the piston, comprising the step of activating the band to create a seal between the piston and the tensioner body such that the seal reduces leakage of oil from the hydraulic pressure chamber.
Dependencies are inferred from the claim text.