Displacement varying structure of variable displacement compressor

A displacement varying structure of a variable displacement compressor that is installed in a refrigerant circuit, wherein the refrigerant circuit has a discharge pressure zone and a suction pressure zone, wherein the variable displacement compressor has a crank chamber, and wherein the displacement varying structure is capable of varying a displacement of the variable displacement compressor by changing a pressure of the crank chamber, the displacement varying structure comprising:

• a supply passage for connecting the crank chamber with the discharge pressure zone;
• a bleed passage for connecting the crank chamber with the suction pressure zone;
• and
• a control valve located in a control passage, the control passage being one of the supply passage and the bleed passage,
• wherein the control valve includes:
• a valve housing defining a valve chamber, a valve hole, and a pressure sensing chamber, wherein the valve chamber and the valve hole form a part of the control passage;
• a valve body accommodated in the valve chamber, wherein the valve body is capable of being displaced, and wherein the valve body adjusts an opening degree of the valve hole in accordance with the position of the valve body in the valve chamber;
• a pressure sensing member accommodated in the pressure sensing chamber, wherein the pressure sensing member divides the pressure sensing chamber into a first chamber and a second chamber, and wherein the pressure sensing member is capable of being displaced in accordance with a pressure difference between the first chamber and the second chamber;
• a separation wall that separates in the valve housing the valve chamber and the pressure sensing chamber from each other, wherein the separation wall has a through hole for connecting the valve chamber and the second chamber with each other;
• a rod that extends through the through hole and connects the pressure sensing member and the vale body with each other, wherein the rod has a separation portion that blocks connection between the valve chamber and the second chamber through the through hole;
• and
• an adjacent zone that is adjacent to the second chamber with the separation portion in between, wherein, if a part of the through hole that is closer to the valve chamber than the separation portion and opens to the valve chamber forms the valve hole, the valve hole is the adjacent zone, and if the valve hole is located at the opposite side of the valve chamber with respect to the second chamber, the valve chamber is the adjacent zone, and wherein the adjacent zone and the second chamber are connected to a common pressure zone in the refrigerant circuit.