Patent ID: 6164926
Filing Date: 2000-12-26
Classification: F04B,Y10T

Abstract:
A variable displacement compressor comprising:a drive shaft rotated about its axis;a compression mechanism for drawing in and compressing gas in accordance with the rotation of the drive shaft, wherein the compression mechanism includes a drive plate supported on the drive shaft, wherein the drive plate inclines between a maximum inclination position, at which the displacement of the compressor is maximum, and a minimum inclination position, at which the compressor displacement is minimum;a crank chamber housing part of the compression mechanism, wherein the gas flows into and out of the crank chamber to vary the displacement in accordance with the pressure of the gas in the crank chamber, the inclination of the drive plate being decreased as the pressure of the crank chamber increases;a suction pressure region, which is exposed to the gas drawn into the compressor by the compression mechanism;a discharge pressure region, which is exposed to the gas compressed by the compression mechanism;a first passage that increases the pressure of the crank chamber by permitting the flow of the gas from the discharge pressure region to the crank chamber;a second passage that decreases the pressure of the crank chamber by permitting the flow of the gas from the crank chamber to the suction pressure region;a valve arranged to open and close a port, which is in one of the first passage and the second passage, the valve having centrifugal force adjustment means for adjusting opening and closing of the port in response to a centrifugal force produced by the rotation of the drive shaft, wherein the valve adjusts the opened area of the port to increase the pressure of the crank chamber when the rotating speed of the drive shaft exceeds a predetermined value; anda stopper engagable with the drive plate for regulating the minimum inclination position of the drive plate such that the minimum displacement is about 30% to 60% of the maximum displacement, wherein the drive plate contacts the stopper when in the minimum inclination position.