Method and apparatus for lubricating piston type compressor

A rotary shaft for lubricating a piston type compressor including a housing that defines an accommodating chamber and a suction pressure region, and a device for being lubricated, the device being located in the accommodating chamber, the rotary shaft comprising:

• a supply passage formed in the rotary shaft for transferring fluid that contains lubricant;
• a communicating port formed at an end of the supply passage for communicating with the suction pressure region;
• a lubricating hole interconnecting the supply passage and the accommodating chamber;
• 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.

A compressor comprising:

• a housing defining a cylinder bore, a cam chamber and a suction pressure. region;
• a rotary shaft 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 supply passage and the cam chamber;
• 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;
• a drive mechanism operatively connected to the rotary shaft, the drive mechanism being located in the cam chamber;
• and
• a piston located in the cylinder bore, the piston engaging the drive mechanism to reciprocate in accordance with rotation of the rotary shaft.

A method of lubricating a piston type compressor that has a housing, a rotary shaft and a drive mechanism, the housing defining a cam chamber and a suction pressure region, the drive mechanism being located in the cam chamber, the rotary shaft including a supply passage that communicates with the suction pressure region and a lubricating hole that interconnect the supply passage and the cam chamber, the method comprising the steps of:

• introducing fluid with lubricant from the suction pressure region into the supply passage;
• turning a flow direction of the lubricant;
• guiding the lubricant toward the lubricating hole;
• and
• feeding the lubricant into the cam chamber through the lubricating hole by centrifugal force due to rotation of the rotary shaft.