Patent ID: 9074600
Filing Date: 2015-07-07
Classification: F04C

Abstract:
1. A rotary compressor comprising: a cylinder having opposite end surfaces and a vane groove defined therein; a main bearing and an auxiliary bearing secured to the opposite end surfaces of the cylinder, respectively, to define a cylinder chamber; a shaft having an eccentric portion formed between the main bearing and the auxiliary bearing, the shaft having a main shaft inserted in the main bearing and an auxiliary shaft inserted in the auxiliary bearing; a piston mounted on the eccentric portion of the shaft; and a vane loosely inserted in the vane groove for a reciprocating motion thereof, the vane partitioning the cylinder chamber into a suction chamber and a compression chamber and having a distal end hingedly connected to the piston; wherein an outer peripheral surface of the eccentric portion of the shaft on a side facing an opposite side to an eccentric direction is located radially inwardly of an outer peripheral surface of the main shaft and that of the auxiliary shaft; wherein the piston has a first back clearance portion defined in an inner peripheral surface thereof and the eccentric portion of the shaft has a second back clearance portion defined therein; wherein the first back clearance portion of the piston further comprises: wherein the second back clearance portion of the eccentric portion further comprises: wherein the outer peripheral surface of the eccentric portion of the shaft on the side facing the opposite side to the eccentric direction is located radially inwardly of the outer peripheral surface of the auxiliary shaft by a first length, the circular shaped recess of the first part has the first length in depth, and the piston is mounted on the shaft by moving the piston toward the shaft from the side of the auxiliary bearing so as to insert the auxiliary shaft into the piston, and then by moving the piston toward the eccentric direction by the first length while utilizing the first and second back clearance portions.