# US 12,110,923 B2 · Sliding component

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- Number: US 12,110,923 B2
- Document ID: US12110923B2
- Status: Granted
- Kind: B2
- Application number: 17/783,256
- Filed: 2020-12-16
- Published: 2023-01-19
- Granted: 2024-10-08
- Earliest claimed: 2019-12-17
- Assignees: Eagle Industry Co., Ltd.
- Applicants: Eagle Industry Co., Ltd.
- Inventors: Hiroshi Suzuki; Yuichiro Tokunaga
- Web page: https://patentgrep.com/patent/US12110923B2

## CPC

- F16C 33/12: Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
- F16J 15/3412: {with cavities (F16J15/3424 takes precedence)}
- F04C 18/0215: {where only one member is moving}
- F04C 29/0021: {Systems for the equilibration of forces acting on the pump (interstice adjustment other than by fluid pressure F01C21/102)}
- F04C 29/0028: {Internal leakage control}
- F16J 15/342: {with means for feeding fluid directly to the face}
- F04C 27/005: {Axial sealings for working fluid}
- F04C 29/02: Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D)
- F04C 2240/54: Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps or compressors
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

## Abstract

Provided is a sliding component capable of reducing the frictional resistance of a sliding surface entailing eccentric rotation. An annular sliding component has a sliding surface relatively sliding with eccentric rotation. A plurality of grooves open to a fluid space on the inner diameter side are circumferentially provided in the sliding surface. A side wall surface of the groove is configured by a wall surface continuous in a circular arc shape in a plan view.

## Claims

### Claim 1

An eccentric sliding assembly in accordance with the present invention comprising:
a first sliding component formed in an annular shape and having a sliding surface, wherein
a second sliding component having a sliding surface; and
an eccentric driving device configured to cause the sliding surface of the first slide component to slide relative to the sliding surface of the second sliding surface such that a center of the first sliding component imaginarily draws a circle which is eccentric with respect to a center of the second sliding component while keeping non-rotation state of the first sliding component with respect to the center of the first sliding component in a plan view,
the sliding surface of at least one of the first sliding component and the second sliding component is provided with a plurality of grooves each of which is open to a fluid space on at least one of an inner diameter side and an outer diameter side and which are arranged in a circumferential direction, and
a side wall surface of each of the grooves is configured by a wall surface continuous in a circular arc shape in a plan view.

### Claim 2 (depends on 1)

The eccentric sliding assembly according to claim 1, wherein each of the grooves is formed in a semicircular shape having a center at an innermost or outermost diameter of the sliding surface of the one of the first sliding component and the second sliding component in the plan view.

### Claim 3 (depends on 2)

The eccentric sliding assembly according to claim 2, wherein each of the grooves is open to the fluid space on the inner diameter side.

### Claim 4 (depends on 2)

The eccentric sliding assembly according to claim 2, wherein each of the grooves is open to the fluid space on a high-pressure side.

### Claim 5 (depends on 2)

The eccentric sliding assembly according to claim 2, wherein the first sliding component has a radial width smaller than a radial width the second sliding component.

### Claim 6 (depends on 1)

The eccentric sliding assembly according to claim 1, wherein each of the grooves is open to the fluid space on the inner diameter side.

### Claim 7 (depends on 6)

The eccentric sliding assembly according to claim 6, wherein each of the grooves is open to the fluid space on a high-pressure side.

### Claim 8 (depends on 6)

The eccentric sliding assembly according to claim 6, wherein the first sliding component has a radial width smaller than a radial width of the second sliding component.

### Claim 9 (depends on 1)

The eccentric sliding assembly according to claim 1, wherein each of the grooves is open to the fluid space on a high-pressure side.

### Claim 10 (depends on 9)

The eccentric sliding assembly according to claim 9, wherein the first sliding component has a radial width smaller than a radial width the second sliding component.

### Claim 11 (depends on 1)

The eccentric sliding assembly according to claim 1, wherein the first sliding component has a radial width smaller than a radial width of the second sliding component.

### Claim 12 (depends on 1)

The eccentric sliding assembly according to claim 1, wherein the grooves including both of the groove which opens to the fluid space on the inner diameter side and the groove which opens to the fluid space on the outer diameter side.