Variable displacement compressor

A variable displacement compressor comprising:

• a housing, which includes a front housing member, a rear housing member and a cylinder block, wherein the housing includes a suction chamber and a discharge chamber;
• a crank chamber, which is defined between the rear housing member and the cylinder block;
• a drive shaft, a first end of which extends from a front end of the housing, wherein the shaft is supported by the housing, and wherein the suction and discharge chambers are closer to the first end of the drive shaft than the crank chamber;
• a cylinder bore, which is located in the cylinder block between the crank chamber and the front end of the housing;
• a single head piston, which is located in the cylinder bore;
• a cam plate located in the crank chamber and connected with the piston to convert rotation of the drive shaft into reciprocation of the piston, wherein the inclination angle of the cam plate is controlled by controlling the pressure in the crank chamber, to change the discharge displacement;
• a shaft sealing assembly for sealing the drive shaft, wherein the shaft sealing assembly is located in the suction chamber;
• and
• a bleed passage for connecting the crank chamber with the suction chamber, wherein an outlet of the bleed passage is located above the shaft sealing assembly.