Patent ID: 6862975

Claim:
A lubricating structure in a piston type compressor, comprising: a housing defining a suction pressure region and an accommodating chamber; a device for being lubricated, the device being located in the accommodating chamber; and a rotary shaft having a central axis, the rotary shaft being rotatably supported by the housing, the rotary shaft including: a supply passage for transferring fluid that contains lubricant; a communicating port interconnecting the supply passage and the suction pressure region; a lubricating hole interconnecting the accommodating chamber and the supply passage; and a flow guiding portion formed on a circumferential surface of the supply passage, the flow guiding portion being located near the lubricating hole for guiding the lubricant toward the lubricating hole, wherein the device to be lubricated is a drive mechanism that is operatively connected to the rotary shaft, the accommodating chamber being a cam chamber, and wherein the rotary shaft further includes a pressure releasing passage that interconnects the cam chamber and a predetermined region, pressure in the predetermined region being lower than that of the cam chamber, the pressure releasing passage guiding the fluid in the cam chamber into the predetermined region.