Piston for swash plate type compressor

Abstract

The object of the present invention is to offer not only a compressor which is compact and reduced in weight, but also its piston whose neck portion is increased in strength at a time. A single-headed piston for a swash plate type compressor has a hollow head portion, a pair of engaged portions engaged with a swash plate, and a neck portion connected to the pair of the engaged portions at the outer peripheral side of the swash plate. The pair of the engaged portions sandwiches both of the outer peripheral end surfaces of the swash plate through a pair of hemispherical shoes. A pair of concave portions having a pair of concave spherical surfaces is formed on the surfaces facing each other of the pair of the engaged portions so as to receive a convex spherical surfaces of shoes slidably. The pair of concave portions have a common spherical center. The spherical center is positioned on the plane which includes the central axis of the head portion and is parallel in the extending direction of the pair of the engaged portions, and is positioned deviatedly to the opposite side (to the radially inner side of the compressor) to the neck portion from the central axis of the head portion. It is desired that the spherical center is positioned deviatedly to the radially inner side of the compressor by equal to or greater than {fraction (1/30)} of the diameter of the head portion. The thickness of the neck portion is increased, and the bending strength of the neck portion is improved. In addition, the diameter of the swash plate is to be compact. Therefore, the compressor is reduced in weight, and is improved in its durability.

Dependencies are inferred from the claim text.