Patent ID: 6484621
Filing Date: 2002-11-26
Classification: F04B

Abstract:
A swash plate type compressor comprising:a cylinder block having a plurality of cylinder bores formed therein such that said cylinder bores are arranged along a circle; a rotary drive shaft having an axis of rotation aligned with a centerline of said circle; a swash plate rotated with said rotary drive shaft; and a plurality of single-headed pistons each including a head portion slidably engaging a corresponding one of said cylinder bores, and a neck portion engaging said swash plate, said each single-headed piston being reciprocated by said swash plate rotated by said rotary drive shaft, said head portion of said each single-headed piston including a body portion having a circular shape in transverse cross section, and an outer sliding portion and an inner sliding portion which are disposed between said body portion and said neck portion, said outer and inner sliding portions slidably engaging respective circumferential portions of an inner circumferential surface of said corresponding cylinder bore which correspond to respective radially outer and inner portions of said cylinder block, wherein said inner sliding portion includes a narrow section disposed on the side of said body portion, and a wide section which is disposed on the side of said neck portion and which has a larger circumferential dimension than said narrow section, and wherein a distance from an end face of said body portion remote from said neck portion to an end of said inner sliding portion on the side of said neck portion is larger than a distance from said end face to an end of said outer sliding portion on the side of said neck portion, and said inner sliding portion has a distal sliding part which is spaced from said end face by a distance of at least 40% of an entire length of said piston in an axial direction of said piston and which has a length that is at least 5% of said entire length of said piston and a central angle of not larger than 120Â°, wherein said central angle is defined by two lines which connect a centerline of said body portion and circumferentially opposite ends of said inner sliding portion as seen in a circumferential direction of said body portion, said central angle of said distal sliding part being different from that of the other part of said inner sliding portion adjacent to said body portion.