Patent ID: 8197229
Filing Date: 2012-06-12
Classification: F04B

Abstract:
1. A double-headed piston type compressor comprising: a housing assembly including a front housing, a rear housing and a cylinder block held between the front housing and the rear housing, the cylinder block defining therein a crank chamber and a plurality of cylinder bores and having a shaft hole therethrough; a double-headed piston accommodated in the cylinder bores for reciprocating therein; a rotary shaft rotatably supported by the shaft hole of the cylinder block; a swash plate accommodated in the crank chamber for rotation with the rotary shaft, the swash plate rotating for allowing the double-headed piston to reciprocate in the cylinder bores; a shaft seal arranged between the front housing and the rotary shaft; compression chambers defined by the cylinder bores in the cylinder block; a suction chamber defined by the front housing; and an introduction passage having a rotary valve for introducing refrigerant from the suction chamber into the compression chambers, wherein the introduction passage includes a plurality of communication passages formed in the cylinder block for connecting the suction chamber to the shaft hole, the communication passages being formed by a plurality of notches provided at the outer edge of the opening of the shaft hole; suction passages connecting the shaft hole and the compression chambers; and a recessed passage formed in the outer circumferential surface of the rotary shaft for connecting intermittently between the communication passage and the respective suction passages in accordance with the rotation of the rotary shaft.