Patent ID: 8147214

Claim:
A compressor, comprising: a cylinder block including a center through-hole and cylinder bores provided around the center through-hole; a partition plate which is jointed to a top-dead-center-side surface of the cylinder block, and which includes intake holes and exhaust holes; an intake chamber and an exhaust chamber communicating with each of the cylinder bores wherein the partition plate is interposed between the intake chamber and the cylinder bores and the exhaust chamber and the cylinder bores; a crank chamber communicating with the cylinder bores in bottom-dead-center sides of the cylinder bores; pistons reciprocatably arranged in the respective cylinder bores; a driving shaft pivotally supported by the center through-hole in the cylinder block, wherein a radial bearing and a thrust bearing are interposed between the driving shaft and the cylinder block; a conversion mechanism for converting rotations of the driving shaft to reciprocating motions of each of the pistons; and an air bleed passage allowing the crank chamber and the intake chamber to communicate with each other, wherein the center through-hole in the cylinder block includes: a first space between the crank chamber and the thrust bearing, wherein the first space is closer to the crank chamber than the thrust bearing; a second space between the thrust bearing and the radial bearing; and a third space between the intake chamber and the radial bearing, wherein the third space is closer to the intake chamber than the radial bearing, wherein the air bleed passage includes: the first space in the center through-hole; a communicating part for allowing the first space and the second space to communicate with each other; the second space in the center through-hole; a penetrating passage formed so as to pass through the driving shaft, thereby allowing the second space and the third space to communicate with each other; the third space; and a communicating passage for allowing the third space and the intake chamber to communicate with each other, and wherein coolant gas flows from the crank chamber to the intake chamber through the air bleed passage such that most of the coolant gas flows from the first space to the second space through the communicating part.