Patent ID: 9021937
Filing Date: 2015-05-05
Classification: F04B

Abstract:
1. A reciprocating compressor comprising: a cylinder; a piston reciprocably disposed in the cylinder; a connecting rod connected to the piston; a shaft having a rotational axis perpendicular to a reciprocating direction of the piston, and connected to the connecting rod so that rotational motion of the shaft itself is converted into linear motion of the piston; and a bearing for supporting the shaft, wherein the reciprocating compressor is a cantilever type reciprocating compressor in which only one side of the shaft is supported by the bearing relative to the connecting rod, the shaft has a journal portion as a portion covered by the bearing, the journal portion has a first journal portion and a second journal portion, the first journal portion being closer to the connecting rod than the second journal portion, with respect to the rotational axis, the bearing has a first sliding portion for supporting the first journal portion and a second sliding portion for supporting the second journal portion, when a plane that is parallel to the reciprocating direction of the piston and includes the rotational axis of the shaft intersects an inner circumferential surface of the bearing at two circumferential positions and the circumferential position closer to the piston is defined as 0°, the first sliding portion has a first recessed portion in a range extending from 270° through 0° to 180° in a rotational direction of the shaft from 0°, when the rotational axis of the shaft coincides with a central axis of the bearing, the first recessed portion forms a larger bearing clearance than a bearing clearance formed in a range other than the ranges of 0° to 180° and 270° to 360°, the second sliding portion has a second recessed portion in a range extending from 90° through 180° to 360° in the rotational direction of the shaft from 0°, and when the rotational axis of the shaft coincides with a central axis of the bearing, the second recessed portion forms a larger bearing clearance than a bearing clearance formed in a range other than the range extending 90° through 180° to 360°.