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AssigneesNippondenso Co., Ltd., Nippon Soken, Inc.
InventorsMitsuo Inagaki, Kenji Takeda, Shigeki Iwanami, Hideaki Sasaya, Eiichi Nagasaku
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A multiple-vane rotary compressor having a cylinder bore profile especially designed to reduce the fluctuation in the overall drive torque applied to the rotor shaft. The cylinder bore profile is configured and designed so that the individual drive torque applied to an individual vane during the compression and delivery strokes varies along a drive torque-vane angle curve which approximates an isosceles triangle having a lower side corresponding to a range of angle of 180.degree.. The cylinder bore profile includes, for a profile section extending through an angle of 180.degree., a first region (i) in which the amount of vane projection is held substantially constant at a maximum value (D), a second region (ii) in which the amount of vane projection decreases at a higher rate, and a third region (iii) in which the amount of vane projection decreases to zero at a lower rate, the imaginary transitional point (A.sub.3) between the second and third regions being located at an angular position of 90.degree..
In a sliding-vane rotary compressor including a vaned rotor and a pump cylinder having a cylinder bore, said compressor comprising four slidable vanes spaced apart from each other at an equal angular distance, said compressor having a single pumping chamber defined by said rotor and said pump cylinder, said vanes engaging the wall of said cylinder bore during rotation of said rotor to form cycles of intake, compression and delivery strokes for said vanes, the improvements wherein said cylinder bore has such a profile that the individual torque applied to an individual vane during each cycle of compression and delivery strokes of said vane varies along a torque curve which approximates an isosceles triangle, the lower side of which corresponds to a range of rotational angle of approximately 180.degree..
Dependencies are inferred from the claim text.