Yoke mechanism for compressor

A scotch yoke structure for a compressor comprising:

• a crank shaft;
• a crank pin connected to the crank shaft so as to revolve around the crank shaft along a circular locus as the crank shaft rotates;
• a frame having one pair of sliding surfaces on parallel opposite inside surfaces thereof for fixing one or more than one piston to an outside of the sliding surface;
• a sliding block rotatably coupled to the crank pin and arranged between the one pair of sliding surfaces, having a surface facing the sliding surface sloped at an angle to the sliding surface;
• one pair of wedge members each having one sloped surface opposite to the sliding surface and the other sloped surface in surface to surface contact with the sliding block;
• one pair of self-lubricating members each attached to the sliding block so as to be in surface to surface contact with the sliding surface;
• and
• an elastic member having one end fixed to the wedge member and the other end fixed to a predetermined position for pressing the wedge member having the self-lubricating member attached thereto both to the sliding block and the sliding surface.