Shoe for swash plate type compressor

Abstract

A shoe for a swash plate type compressor is disposed between a swash plate provided on a rotational shaft in an inclined manner, the swash plate being configured to be rotated together with the rotational shaft, and a piston configured to be reciprocated in a direction in which the rotational shaft extends, by means of the rotation of the swash plate. The shoe for swash plate type compressor includes a flat surface in contact with the swash plate, and a spherical surface in contact with a semispherical slide surface formed on the piston. A through-hole communicating the flat surface and the spherical surface with each other is formed between the flat surface and the spherical surface. The through-hole is composed of a first through-hole having a first diameter and a second through-hole having a second diameter that is larger than the first diameter.

1 . A shoe for swash plate type compressor, disposed between a swash plate provided on a rotational shaft in an inclined manner, the swash plate being configured to be rotated together with the rotational shaft, and a piston configured to be reciprocated in a direction in which the rotational shaft extends, by means of the rotation of the swash plate, the shoe for swash plate type compressor comprising:
 a flat surface in contact with the swash plate; and   a spherical surface in contact with a semispherical slide surface formed on the piston;   wherein:   a through-hole communicating the flat surface and the spherical surface with each other is formed between the flat surface and the spherical surface; and   the through-hole is composed of a first through-hole of a cylindrical shape having a first diameter and a second through-hole of a cylindrical shape having a second diameter that is larger than the first diameter.   
     
     
         2 . The shoe for swash plate type compressor according to  claim 1 , wherein
 the first through-hole is formed on a side of the spherical surface so as to extend up to the spherical surface, and   the second through-hole is formed on a side of the flat surface so as to extend up to the flat surface.   
     
     
         3 . The shoe for swash plate type compressor according to  claim 1 , further comprising
 a transitional hole of a truncated conical shape formed between the first through-hole and the second through-hole, the transitional hole communicating the first through-hole and the second through-hole with each other.   
     
     
         4 . The shoe for swash plate type compressor according to  claim 1 , wherein
 an inner circumferential part of the flat surface adjacent to the through-hole is inclined toward the spherical surface, and   an inner circumferential part of the spherical surface adjacent to the through-hole is inclined toward the flat surface.   
     
     
         5 . The shoe for swash plate type compressor according to  claim 1 , wherein
 the spherical surface has a contact surface in contact with the slide surface of the piston under a static state, and a non-contact surface not in contact with the slide surface under the static state.   
     
     
         6 . The shoe for swash plate type compressor according to  claim 5 , wherein
 the flat surface has a contact surface in contact with the swash plate under the static state, and   an area of the contact surface of the spherical surface and an area of the contact surface of the flat surface are substantially equal to each other.