Semispherical shoe for swash plate compressor and swash plate compressor

Patent metadata

Field	Value
Publication number	US-10598167-B2
Application number	US-201515328204-A
Country	US
Kind code	B2
Filing date	Jul 22, 2015
Priority date	Jul 23, 2014
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A swash plate compressor in which a lubricating film is not formed on a sliding contact surface of the swash plate and the piston owing to the use of the semispherical shoe. The semispherical shoe ( 4 ) is subjected to sliding contact with the swash plate of the swash plate compressor and the piston thereof. A base material ( 5 ) consists of a metallic member having a resin layer ( 6 b ) formed on a surface of a planar part ( 4 b ) that is subjected to sliding contact with the swash plate. A resin layer ( 6 a ) is formed on a surface of a spherical part ( 4 a ) to be subjected to sliding contact with the piston. The resin layer ( 6 a ) and the resin layer ( 6 b ) are integral with each other. At least one portion of the base material ( 5 ) is exposed.

First claim

The invention claimed is:

1. A semispherical shoe for a swash plate compressor so constructed that inside a housing where a refrigerant is present, a rotational motion of a swash plate mounted perpendicularly and obliquely on a rotational shaft by directly fixing said swash plate thereto or indirectly fixing said swash plate thereto through a coupling member to said rotational shaft is converted into a reciprocating motion of a piston through a semispherical shoe to be subjected to sliding contact with said swash plate to compress and expand said refrigerant,
wherein said semispherical shoe is composed of a base material consisting of a metallic member, and a resin layer is formed on a surface of a planar part to be subjected to sliding contact with said swash plate and on a surface of a spherical part to be subjected to sliding contact with said piston by injection-molding a resin composition; and
said resin layer of said planar part and said resin layer of said spherical part are integral with each other, and at least one portion of said base material is not covered with said resin layer and is exposed,
wherein (1) a hollow part forming a concave portion in a direction from a spherical part side of said semispherical shoe or a planar part side thereof is formed at a central axis portion of said base material or (2) a hollow part penetrating through said spherical part side and said planar part side is formed at said central axis portion of said base material, and one portion of said hollow part is filled with said resin layer.

2. A semispherical shoe for a swash plate compressor according to claim 1 , wherein at least one portion of said hollow part is not filled with said resin layer and in said at least one portion of said hollow part, said base material is exposed.

3. A semispherical shoe for a swash plate compressor according to claim 2 , wherein an axial length of an exposed portion of said hollow part is not less than ⅓ of a height of said semispherical shoe.

4. A semispherical shoe for a swash plate compressor according to claim 1 , wherein a non-contact portion which does not contact said piston is formed on an outer surface of said spherical part side, and said base material is not covered with said resin layer and is exposed at said non-contact portion.

5. A semispherical shoe for a swash plate compressor according to claim 1 , wherein at least one portion of a peripheral part connecting said planar part and said spherical part to each other is not covered with said resin layer, and said base material is exposed at said one portion of said peripheral part not covered with said resin layer.

6. A semispherical shoe for a swash plate compressor according to claim 1 , wherein
said resin composition is a resin composition containing aromatic polyether ether ketone resin as a base resin thereof,
a thickness of said resin layer of said planar part and that of said resin layer of said spherical part are 0.1 to 0.7 mm, and said resin layer of said planar part and said resin layer of said spherical part are formed integrally with each other on a surface of said base material by injection-molding said resin composition.

7. A semispherical shoe for a swash plate compressor according to claim 6 , wherein said resin composition contains 1 to 30% by volume of polytetrafluoroethylene resin and 5 to 30% by volume of at least one of carbon fiber and graphite for 100% by volume of said resin composition.

8. A semispherical shoe for a swash plate compressor according to claim 6 , wherein a melt viscosity of said resin composition is 50 to 200 Pas when a temperature of said resin composition is 380 degrees C. and a shear velocity thereof is 1000 s −1 .

9. A semispherical shoe for a swash plate compressor according to claim 1 , wherein said metallic member consists of an iron-based sintered metal, and a density of said metallic member is 0.7 to 0.9 which is a theoretical density ratio of a material used as said base material.

10. A semispherical shoe for a swash plate compressor according to claim 1 , wherein said resin layer of said spherical part is thicker than said resin layer of said planar part.

11. A semispherical shoe for a swash plate compressor according to claim 10 , wherein a thickness of said resin layer of said planar part is not less than 0.1 mm nor more than 0.3 mm, and a thickness of said resin layer of said spherical part exceeds 0.3 mm and is not more than 0.7 mm.

12. A swash plate compressor so constructed that inside a housing where a refrigerant is present, a rotational motion of a swash plate mounted perpendicularly and obliquely on a rotational shaft by directly fixing said swash plate thereto or indirectly fixing said swash plate thereto through a coupling member to said rotational shaft is converted into a reciprocating motion of a piston through a semispherical shoe to be subjected to sliding contact with said swash plate to compress and expand said refrigerant,
wherein said semispherical shoe is as claimed in claim 1 .

13. A swash plate compressor according to claim 12 , wherein a sliding contact surface of said swash plate to be subjected to sliding contact with said semispherical shoe is a polished surface of a base material of said swash plate and does not have a lubricating film thereon.

14. A swash plate compressor according to claim 12 , wherein said refrigerant is carbon dioxide.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Ishii Takuya
• Fukuzawa Satoru
• Abe Hirohisa
• Oomori Akihiro

Classifications

• F04B27/1081

  Casings, housings · CPC title

• F04B27/12

  having plural sets of cylinders or pistons · CPC title

• F01B3/0088

  Piston shoe retaining means · CPC title

• F04B27/0882

  piston shoe retaining means · CPC title

• F04B1/2085

  Bearings for swash plates or driving axles · CPC title