VARIABLE DISPLACEMENT ROTARY COMPRESSOR PREVENTING UPPER ECCENTRIC BUSH OR LOWER ECCENTRIC BUSH FROM BEING SLIPPED

摘要

PURPOSE: A variable displacement rotary compressor is provided to prevent an upper eccentric bush or a lower eccentric bush from being slipped, thereby preventing a noise and improving the durability. CONSTITUTION: Upper and lower compressing chambers have different inner volumes. A rotary shaft(21) passes through the upper and lower compressing chambers. Upper and lower eccentric cams(41,42) are eccentrically installed at the rotary shaft so that the upper and lower eccentric cams are arranged inside the upper and lower compressing chambers. Upper and lower eccentric bushes(51,52) are arranged on outer peripheral surfaces of the upper and lower eccentric cams, respectively. A fixing pin(43) selectively converts positions of the upper and lower eccentric bushes into the maximum eccentric position according to a rotary direction of the rotary shaft. An eccentric line(L1-L1) of the upper eccentric bush and an eccentric line(L2-L2) of the lower eccentric bush form an alternate angle. An angle formed by the maximum eccentric part of the upper eccentric bush and the maximum eccentric part of the lower eccentric bush is smaller than 180 deg. to the rotary direction of the upper eccentric bush or the lower eccentric bush performing compressing operation.