Scroll Compressor

A scroll compressor comprising:

• a compression chamber formed by engaging a fixed scroll and an orbiting scroll with each other, each of which has an end plate and a spiral lap provided in a rising manner in said end plate;
• a crank shaft making said orbiting scroll carry out a turning motion;
• an orbiting bearing portion engaging said orbiting scroll and an eccentric pin portion of said crank shaft so as to be movable in a direction of a rotating axis and be rotatable and provided in a back face of the orbiting scroll;
• a main bearing portion arranging a support portion which rotatably engages said crank shaft in a center portion of a frame member;
• a back pressure chamber zoned by a seal member which is arranged between the back face of said orbiting scroll and the frame member;
• a high pressure chamber zoned in an inner side of said seal member being maintained at a pressure which is approximately equal to a discharge pressure;
• and
• the back pressure chamber zoned in an outer side of said seal member being maintained at a pressure which is lower than the discharge pressure,
• wherein a spiral shaped groove passage is formed in an outer peripheral surface of the orbiting bearing, and a throttle passage communicating with the back pressure chamber is arranged so as to be provided with such the throttle passage as to be capable of continuously feeding a lubricating oil to the back pressure chamber from the high pressure chamber.