Patent 7908962 was granted and assigned to LG on March, 2011 by the United States Patent and Trademark Office.
A compressor is provided that includes a supplementary torque providing part that reduces a speed of a piston compression of refrigerant and increases the speed of the piston in drawing of the refrigerant. This structure reduces a compression rate of the refrigerant in compression relatively, and increases a re-expansion rate, to maximize suction efficiency.