# US 5,700,215 A · Hydraulic tensioner with piston retention stop

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,700,215 A
- Document ID: US5700215A
- Status: Granted
- Kind: A
- Application number: 08/675,389
- Filed: 1996-07-02
- Granted: 1997-12-23
- Earliest claimed: 1995-08-11
- Assignees: Borg-Warner Automotive, Inc.
- Inventors: Naosumi Tada; Naoji Sakamoto
- Web page: https://patentgrep.com/patent/US5700215A

## CPC

- F16H 7/08: Means for varying tension of belts, ropes or chains (pulleys of adjustable construction F16H55/52)
- F16H 7/0848: {with means for impeding reverse motion}
- F02B 67/06: driven by means of chains, belts, or like endless members
- F02B 2275/18: DOHC [Double overhead camshaft]
- F16H 2007/0806: {Compression coil springs}
- F16H 2007/0812: {Fluid pressure}
- F16H 2007/0859: {Check valves}
- F16H 2007/0878: {Disabling during transport}
- F16H 2007/0891: {Linear path}
- F16H: GEARING
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

A hydraulic tensioner having a slidable plunger in a housing, a shaft stopper ring on the rear-end of the plunger, and a stopper screw fastened to the housing that can engage with the shaft stopper ring at the retracted position of the plunger. Packing is provided to seal a clearance between the stopper screw and the housing when the stopper screw is in its engagement position with the housing.

## Claims

### Claim 1

A hydraulic tensioner comprising:
a housing having an oil chamber formed in a bore in said housing;
a plunger inserted in said oil chamber and biased by a spring toward the protruding direction of said housing;
an engagement part located at the rear-end of said plunger;
a stopper screw for engagement with said engagement part when said plunger is retracted into said oil chamber in the plunger retraction position, said stopper screw being fastened to said housing;
a sealing member for sealing a clearance between said stopper screw and said housing when the stopper screw is fastened onto said housing.

### Claim 2 (depends on 1)

The hydraulic tensioner of claim 1 wherein said engagement part is a shaft stopper ring.

### Claim 3 (depends on 1)

The hydraulic tensioner of claim 1 wherein said engagement part is a female thread part formed on the rear-end face of said plunger.

### Claim 4 (depends on 1)

The hydraulic tensioner of claim 1 wherein said stopper screw includes an engagement part on its end portion with which a tool can turn to engage .