# US 9,435,327 B2 · Shoe

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- Number: US 9,435,327 B2
- Document ID: US9435327B2
- Status: Granted
- Kind: B2
- Application number: 12/735,670
- Filed: 2009-12-07
- Published: 2011-05-12
- Granted: 2016-09-06
- Earliest claimed: 2009-05-28
- Assignees: Taiho Kogyo Co., Ltd.
- Applicants: Masaharu Hatta; Satoshi Nomura
- Inventors: Masaharu Hatta; Satoshi Nomura
- Web page: https://patentgrep.com/patent/US9435327B2

## CPC

- F04B 27/0886: {Piston shoes}
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)

## Abstract

A shoe 5 includes a spherical portion 5A in sliding contact with a sliding surface 4a that is a hemispherical concave portion of a piston 4, an end surface portion 5B in sliding contact with a swash plate 3, and a circular cylindrical portion 5C formed between the spherical portion 5A and the end surface portion 5B. Linear oil grooves 5F are formed in the outer peripheral surface of the cylindrical portion 5C.

## Claims

### Claim 1

A shoe comprising:
a spherical portion having a spherical surface that slides in a hemispherical concave portion of a first movable member, with neither a groove nor a concave portion being formed on the spherical surface;
an end surface portion having a sliding surface that slides on a flat surface of a second movable member;
a cylindrical portion formed between the spherical portion and the end surface portion, the cylindrical portion being unitary with the spherical portion and the end surface portion; and
a plurality of grooves formed on an outer peripheral surface of the cylindrical portion for holding a lubricant oil, the grooves having a constant depth, a rectangular sectional shape and extending continuously from the spherical portion to the end surface portion, wherein
the cylindrical portion does not slide in either the hemispherical concave portion of the first movable member or on the flat surface of the second movable member.

### Claim 2 (depends on 1)

The shoe according to claim 1, wherein the cylindrical portion has a constant outer diameter over an entire axial length.

### Claim 3 (depends on 1)

The shoe according to claim 1, wherein the cylindrical portion is formed in a tapered shape where the spherical portion side has a smaller diameter than the end surface portion side.

### Claim 4 (depends on 1)

The shoe according to claim 1, wherein the cylindrical portion is formed in a tapered shape where the end surface portion side has a smaller diameter than the spherical portion side.

### Claim 5 (depends on 1)

The shoe according to claim 1, wherein the cylindrical portion has a drum shape where an axial center portion radially expands outward so as to have a largest outer diameter.

### Claim 6 (depends on 1)

The shoe according to claim 1, further comprising
a flange portion formed radially extending outward on an outer peripheral edge of the end surface portion, the flange portion being unitary with the spherical portion, the end surface portion, and the cylindrical portion.

### Claim 7 (depends on 1)

The shoe according to claim 1, wherein the plurality of grooves have a linear or V shape, and are provided at equal pitches in the outer peripheral surface of the cylindrical portion.

### Claim 8 (depends on 1)

The shoe according to claim 1, wherein the plurality of grooves are provided at equal pitches in the outer peripheral surface of the cylindrical portion.

### Claim 9 (depends on 1)

The shoe according to claim 1, wherein the cylindrical portion is longer than the spherical portion.

### Claim 10 (depends on 1)

The shoe according to claim 1, wherein the end surface portion has neither a groove nor a concave portion on an outer peripheral surface of the end surface portion.