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A rotary hermetic compressor including a compressor cylinder having a bore therein, and a sliding vane slidably disposed in a slot in the compressor wall. The vane extends into the bore of the cylinder for cooperating with a roller to divide the compression chamber into a suction chamber and a disch

A rotary hermetic compressor including a compressor cylinder having a bore therein, and a sliding vane slidably disposed in a slot in the compressor wall. The vane extends into the bore of the cylinder for cooperating with a roller to divide the compression chamber into a suction chamber and a discharge chamber. A pressure groove is formed in the wall of the slot on the suction side of the vane. The pressure groove is supplied with oil by means of a passage directly connecting the groove with the oil sump whereby a bias force is applied to the vane to partially offset the unbalanced lateral force on the vane portion extending into the cylinder bore.

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The method for providing a lateral biasing force on only the suction side of a sliding vane of a rotary hermetic compressor, said compressor including a housing, an oil sump in said housing, a cylinder having a bore and a vane slot therein, a vane slidably received in said slot, said vane having a s

The method for providing a lateral biasing force on only the suction side of a sliding vane of a rotary hermetic compressor, said compressor including a housing, an oil sump in said housing, a cylinder having a bore and a vane slot therein, a vane slidably received in said slot, said vane having a suction side and a discharge side, an end plate and bearing respectively disposed adjacent opposite end faces of said cylinder, means in said bore for compressing a gas therein, said vane and said compressing means dividing said bore into respective high and low pressure chambers, said method comprising: providing a first groove in a wall of said vane slot on the suction side of said vane; discharging high pressure gas from said bore into said housing, thereby exerting pressure on the oil in said oil sump; directly connecting said groove to said sump with a passage, whereby oil is supplied to only said groove from said sump by the relative pressure difference between said housing and said groove, said oil providing a biasing force on only the suction side of said vane.