Compressor

Abstract

A compressor of the present invention includes a crank shaft, a bearing, a casing, an outer-race gear that is disposed so as to surround the crank shaft, a planetary gear that has a radius of a pitch circle set to a half of a radius of a pitch circle of the outer-race gear and causes the crank shaft to be inserted therethrough so that the planetary gear rotates relative to the crank shaft, a piston that is connected to the planetary gear so as to rotate relative to the planetary gear and moves in a reciprocating manner in the direction parallel to the radial direction of the outer-race gear inside the casing in a manner such that the planetary gear rotates inside the outer-race gear while engaging with the outer-race gear, and a pump that supplies lubricant to the bearing. Here, the pump is accommodated inside the casing.

What is claimed is: 
     
         1 . A compressor comprising:
 a crank shaft that is rotationally driven by a prime mover;   a bearing that receives the crank shaft;   a casing that accommodates the crank shaft and the bearing;   an outer-race gear that is disposed inside the casing so as to surround the crank shaft;   a planetary gear that has a radius of a pitch circle set to a half of a radius of a pitch circle of the outer-race gear and causes the crank shaft to be inserted therethrough so that the planetary gear rotates relative to the crank shaft;   a piston that is connected to the planetary gear so as to rotate relative to the planetary gear, the piston moving in a reciprocating manner along the direction parallel to the radial direction of the outer-race gear inside the casing when the planetary gear rotates inside the outer-race gear while engaging with the outer-race gear; and   a pump that is accommodated inside the casing and supplies lubricant to the bearing.   
     
     
         2 . The compressor according to  claim 1 ,
 wherein the crank shaft is connected to the pump so that the pump is driven by the rotation of the crank shaft.   
     
     
         3 . The compressor according to  claim 1 ,
 wherein an oil buffer is formed between the crank shaft and an attachment wall for the pump.