Check valve assembly structure for hydraulic tensioner
AssigneeBorgWarner Inc.
InventorYoung Taek SUN
Life of this patent
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Abstract
This invention relates to a hydraulic tensioner comprising a tensioner body, a hollow piston, a hydraulic pressure chamber, a piston spring, and a check valve assembly. The check valve assembly includes a ball, a spring, and a retainer that are assembled directly on the tensioner body. The retainer is preferably press-fit onto the tensioner body. The check valve assembly preferably does not include a seal or a seat.
Claims21
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;
- 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 check valve assembly located in the tensioner body, comprising:
- a check valve retainer;
- a ball;
- and
- a check valve spring located between the ball and the retainer;
- wherein the ball and the check valve spring are integrally assembled on the tensioner body and the check valve retainer is assembled onto the tensioner body.
A method of assembling 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, 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 check valve assembly comprising a check valve retainer, a ball, and a check valve spring located between the ball and the check valve retainer, comprising the step of directly assembling the check valve retainer onto the tensioner body.
A check valve assembly for a hydraulic tensioner comprising a tensioner body comprising:
- a) a retainer shaped to be directly assembled into the tensioner body;
- b) a ball;
- and
- c) a check valve spring located between the ball and the check valve retainer;
- wherein the check valve assembly does not include a seal;
- and
- wherein the check valve assembly does not include a valve seat.
Dependencies are inferred from the claim text.