# US 2018/0023702 A1 · Oil ring

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

- Number: US 2018/0023702 A1
- Document ID: US20180023702A1
- Status: Published application
- Kind: A1
- Application number: 15/534,119
- Filed: 2015-12-01
- Published: 2018-01-25
- Earliest claimed: 2014-12-11
- Assignees: Riken
- Applicants: Kabushiki Kaisha Riken
- Inventors: Daisuke NAKAMURA; Kazuyuki YAMAHATA; Mitsuhiro ADACHI
- Web page: https://patentgrep.com/patent/US20180023702A1

## CPC

- F16J 9/06: using separate springs {or elastic elements} expanding the rings; Springs therefor {; Expansion by wedging}
- F02F 5/00: Piston rings, e.g. associated with piston crown
- F16J 9/062: {Coiled spring along the entire circumference}
- F16J 9/20: Rings with special cross-section (L-section rings F16J9/02); Oil-scraping rings {(F16J9/06 takes precedence)}
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES

## Abstract

An oil ring (1) includes an oil ring body (10) and a coil expander (20). The oil ring body (10) includes a pair of rail portions (12) each including an end portion of an outer periphery having a land (30) formed protruding radially outward from each rail portion (12). The land (30) includes an upper axial portion (31) and a lower axial portion (32) facing opposite to each other in an axial direction, a tapered portion (33) having one axial end contiguous to the upper axial portion (31) via a first curved portion (35), and a protruding portion (34) having one of axial ends contiguous to the tapered portion (33) and the other axial end contiguous to the lower axial portion (32) via a second curved portion (36). The protruding portion (34) is protruding in a direction perpendicular to the tapered portion (33).

## Claims

### Claim 1

An oil ring including an oil ring body, which is formed in a sprit ring shape having an opening, a web portion, and a pair of rail portions integrally formed with either axial end of the web portion, and also including a coil expander, which is mounted on a radially inner side of the oil ring body to push the oil ring body radially outward, the oil ring comprising:
a land formed, at an end portion of an outer periphery of each of the pair of rail portions, in a manner protruding radially outward from the pair of rail portions, the land including
a pair of axial portions facing opposite to each other in an axial direction,
a tapered portion having one axial end contiguous to one of the axial portions via a first curved portion, and
a protruding portion having one of axial ends contiguous to the tapered portion and the other axial end contiguous to the other axial portion via a second curved portion, the protruding portion protruding from the tapered portion in a direction perpendicular to the tapered portion.

### Claim 2 (depends on 1)

The oil ring according to claim 1, wherein a peripheral surface of the protruding portion is formed in a semi-barrel shape.

### Claim 3 (depends on 1)

The oil ring according to claim 1, wherein a peripheral surface of the protruding portion is formed in a cylindrical shape in parallel with the axial direction.

### Claim 4 (depends on 1)

The oil ring according to claim 1, wherein a radial direction height of the protruding portion from a connection portion between the protruding portion and the tapered portion is at least 0.018 mm.

### Claim 5 (depends on 1)

The oil ring according to claim 1, wherein the tapered portion has a conical surface inclined at an angle of 55 degrees or less with respect to the axial direction.

### Claim 6 (depends on 1)

The oil ring according to claim 1, wherein both a radius of the first curved portion and a radius of a second curved portion are 0.12 mm or less.

### Claim 7 (depends on 1)

The oil ring according to claim 1, wherein an axial length of the tapered portion is at least 0.05 mm.