US 4,641,570 AGranted

Swash plate type compressor having a center cavity in surface of piston shoe

AssigneesTaiho Kogyo Co., Ltd., Kabushiki Kaisha Toyoda Jidoshokki Seisakusho

InventorsKenichiro Futamura, Keiichiro Ohtsu, Tatsuhiko Fukuoka, Kenji Takenaka, Yoshio Itakura, Hiroshi Koga

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Abstract

A swash plate type compressor having shoes provided with center holes on the slidable surfaces. The center hole provided with a bottom acts as a reservoir for lubricating oil and supplys the oil on the slidable surface of the shoe, which slides against the swash plate. There can be a second ring groove concentric to the center hole, or annexed grooves which are stretching outward radially from the center hole. The center hole also prevents the center part from protruding outward by thermal expansion, which is caused by friction. The slidable surface of the shoe is preferably coated with a layer containing solid lubricant so as to smooth the sliding motions.

Claims5

Dependent claims

A swash plate type compressor comprising

a cylinder block which has at least one cylinder bore which extends parallel to a rotatable shaft;
a swash plate rotated by said rotatable shaft within said cylinder block and having a sliding surface transverse to said rotatable shaft;
a piston attached movably within said cylinder bore;
and
a shoe which intervenes between said piston and said swash plate and reciprocates said piston by rotation of said swash plate,
wherein said shoe has a substantially non-deformable surface which contacts said sliding surface of said swash plate, said substantially non-deformable surface being provided with a cavity which forms an opening to said shoe and which terminates within said shoe, the area of said opening being from 0.3% to 20% of the area of said surface of said shoe.

3 more elements

Dependencies are inferred from the claim text.