Patent ID: 6705204
Filing Date: 2004-03-16
Classification: F04B

Abstract:
A swash plate-type compressor comprising:a cylinder block having a plurality of cylinder bores formed therethrough; a drive shaft rotatably supported by said cylinder block; a swash plate mounted on said drive shaft and rotating therewith; a plurality of pistons, wherein each of said plurality of pistons is slidably positioned within a respective one of said cylinder bores to reciprocate therein, and wherein each of said pistons has a pair of substantially semispherical cavities formed at an end thereof; and a plurality of pairs of shoes, each of said pairs of said shoes is positioned between each of said pistons and said swash plate, wherein each of said shoes has a semispherical portion adapted to be positioned within one of said substantially semispherical cavities of said plurality of pistons and a flat portion slidable along a surface of said swash plate, wherein a first concave portion is formed in said flat portion of each shoe, and a second concave portion is formed in said semispherical portion of each shoe, and wherein a radius of said second concave portion is between about 10% and about 30% of a radius of said semispherical portion.