Shoe for compressors

Abstract

A shoe for compressors, in which lightening and practical strength can be made compatible with each other, is provided. A shoe for compressors, according to the invention, comprises a base portion having a swash-plate sliding contact surface in sliding contact with a swash plate and a semi-spherical portion made integral with the base portion and having a bearing-seat sliding contact surface in sliding contact with a bearing seat, which is in the form of a spherical surface and provided concavely on a piston. A cavity is formed between the base portion and the semi-spherical portion. The base portion and the semi-spherical portion are connected to each other by a solid connecting portion, which passes through centers of the both portions and extends in a central direction of the both portions.

1 . A shoe for compressors, comprising:
 a base portion having a swash-plate sliding contact surface in sliding contact with a swash plate,   a semi-spherical portion made integral with the base portion and having a bearing-seat sliding contact surface in sliding contact with a bearing seat, which is in the form of a spherical surface and provided concavely on a piston,   a cavity formed between the base portion and the semi-spherical portion, and   a solid connecting portion, which connects the base portion and the semi-spherical portion to each other and passes through centers of the base portion and the semi-spherical portion and extends in a central direction of the base portion and the semi-spherical portion.   
   
   
       2 . The shoe for compressors, according to  claim 1 , further comprising an opening formed between the base portion and the semi-spherical portion to communicate the cavity to an outside. 
   
   
       3 . The shoe for compressors, according to  claim 1 , wherein materials of the base portion and the semi-spherical portion are different from each other. 
   
   
       4 . The shoe for compressors, according to  claim 3 , wherein materials of the base portion, the semi-spherical portion, and the connecting portion are different from one another. 
   
   
       5 . The shoe for compressors, according to  claim 1 , wherein the connecting portion is defined by a rib provided upright on the semi-spherical portion on an opposite side of the bearing-seat sliding contact surface and a tip end of the rib defines the swash-plate sliding contact surface. 
   
   
       6 . The shoe for compressors, according to  claim 1 , wherein the connecting portion is defined by a rib provided upright on the base portion on an opposite side of the swash-plate sliding contact surface and a tip end of the rib defines the bearing-seat sliding contact surface. 
   
   
       7 . The shoe for compressors, according to  claim 1 , wherein the semi-spherical portion includes a cap-shaped head portion and a rib provided upright on the head portion on an opposite side of the bearing-seat sliding contact surface,
 the connecting portion is defined by the rib, and   the base portion is disk-shaped to fit with the semi-spherical portion such that the base portion and the semi-spherical portion ensure the cavity therebetween.   
   
   
       8 . The shoe for compressors, according to  claim 1 , wherein the base portion includes a disk-shaped bottom portion and a rib provided upright on the bottom portion on an opposite side of the swash-plate sliding contact surface,
 the connecting portion is defined by the rib, and   the semi-spherical portion is cap-shaped to fit with the base portion such that the semi-spherical portion and the base portion ensure the cavity therebetween.   
   
   
       9 . The shoe for compressors, according to  claim 7 , wherein materials of the base portion and the semi-spherical portion are different from each other. 
   
   
       10 . The shoe for compressors, according to  claim 8 , wherein materials of the base portion and the semi-spherical portion are different from each other.