Variable displacement compressor

A variable displacement compressor including a suction chamber into which a refrigerant, before being compressed, is introduced, a compression section that draws and compresses the refrigerant in the suction chamber, a discharge chamber into which the compressed refrigerant compressed by the compression section is discharged, and the controlled pressure chamber, in which a discharge displacement changes in accordance with a pressure in the controlled pressure chamber,

• the variable displacement compressor comprising:
• a control valve disposed in a pressure supply passage for supplying the refrigerant in the discharge chamber to the controlled pressure chamber, the control valve being adapted to adjust an opening degree of the pressure supply passage;
• a switching valve disposed in the pressure supply passage to be closer to the controlled pressure chamber than the control valve is, the switching valve switching between a first state in which the switching valve provides communication between a first valve hole communicating with a pressure supply passage between the control valve and the switching valve, and a second valve hole communicating with a pressure supply passage between the switching valve and the controlled pressure chamber, and a second state in which the switching valve provides communication between the second valve hole and a pressure release hole communicating with the suction chamber;
• and
• a throttle passage that provides communication between the pressure supply passage between the control valve and the switching valve, and the suction chamber,
• the switching valve comprising:
• a main valve body including an internal passage for providing communication between the first valve hole and the second valve hole, the main valve body being adapted to operate so that the main valve body blocks the communication between the second valve hole and the pressure release hole, when a pressure in the pressure supply passage between the control valve and the switching valve is higher than a pressure in the controlled pressure chamber, whereas the main valve body provides communication between the second valve hole and the pressure release hole, when the pressure in the pressure supply passage between the control valve and the switching valve is lower than the pressure in the controlled pressure chamber;
• and
• a sub valve body adapted to operate so that the sub valve body opens the internal passage of the main valve body, when the pressure in the pressure supply passage between the control valve and the switching valve is higher than the pressure in the controlled pressure chamber, whereas the sub valve body closes the internal passage of the main valve body, when the pressure in the pressure supply passage between the control valve and the switching valve is lower than the pressure in the controlled pressure chamber,
• wherein the sub valve body is formed to be lighter than the main valve body, and the sub valve body actuates before the main valve body to close the internal passage of the main valve body, when the control valve closes the pressure supply passage and the pressure in the pressure supply passage between the control valve and the switching valve decreases.