VARIABLE DISPLACEMENT SWASH PLATE COMPRESSOR

摘要

To provide a piston compressor capable of preventing excessive oil from accumulating in a crank chamber in any operation state while securing the supply of oil to a swash plate. In a piston compressor in which an oil separation passage (43) is formed in a shaft (7) and a crank chamber (2) communicates with a suction chamber (31) through the oil separation passage (43), a supply passage (40) opens at a region of a cylinder block (1) opposed to a swash plate (18) to thereby allow a working fluid introduced from a discharge chamber (32) into the crank chamber (2) to be supplied to the swash plate (18) and a bypass passage (50) allowing the crank chamber (2) to constantly communicate with the suction chamber (31) is provided to thereby prevent the accumulation of excessive oil in the crank chamber (2) regardless of the operation condition. The bypass passage (50) communicates with the crank chamber (2) at a region positioned in the outer side of a rotation trajectory of the swash plate (18) in the radial direction.

主权项

1. A variable displacement swash plate compressor comprising:
a cylinder block in which a plurality of cylinder bores are formed; a front housing assembled to a front side of the cylinder block to define a crank chamber; a rear housing attached to a rear side of the cylinder block, in which a suction chamber and a discharge chamber are formed; pistons arranged in respective cylinder bores of the cylinder block so as to reciprocate; a shaft supported by the front housing and the cylinder block so as to rotate freely; a swash plate rotating integrally with the shaft and attached to the shaft so that a tilt angle is variable; and shoes interposed between a peripheral edge portion of the swash plate and the pistons so as to slide, converting a rotating motion of the swash plate into a reciprocating motion of the pistons, wherein a supply passage allowing the discharge chamber to communicate with the crank chamber and a release passage allowing the crank chamber to communicate with the suction chamber are provided for controlling a pressure in the crank chamber to control the tilt angle of the swash plate with respect to the shaft, wherein part of the release passage is formed by an oil separation passage formed in the shaft, wherein the oil separation passage is configured by including a shaft hole extended in an axial direction from a rear end to a front end of the shaft, and a side hole extended in a radial direction and communicating with the shaft hole as well as opening to the crank chamber, wherein the supply passage is configured by including a through hole formed in the cylinder block so that the through hole opens at a region opposed to the swash plate, and wherein a bypass passage allowing the crank chamber to constantly communicate with the suction chamber is provided separately from the release passage.