Control valve in variable displacement compressor and method of manufacturing the same

A control valve in a variable displacement compressor that adjust a discharge displacement in accordance with the inclination angle of a swash plate disposed in a crank chamber, wherein the inclination angle of the swash plate varies according to the differential pressure between a pressure in the crank chamber and the pressure in a cylinder bore, wherein the compressor includes a adjusting device for adjusting the differential pressure, wherein the adjusting device includes the control valve and a gas passage for conducting refrigerant gas, and wherein the control valve regulates the amount of the refrigerant gas flow in the gas passage, the control valve comprising:

• a retainer cylinder including a first cylindrical member made of non-magnetic material and a second cylindrical member made of magnetic material, the second cylindrical member having a bottom portion;
• a stationary core disposed in the retainer cylinder;
• a movable core disposed in the retainer cylinder, wherein the movable core is located between the stationary core and the bottom portion of the second cylindrical member;
• a shim made of non-magnetic material, the shim is disposed in the retainer cylinder and located between the movable core and the bottom portion of the second cylindrical member,
• a coil disposed around the retainer cylinder;
• and
• a valve body movably linked with the movable core, wherein the valve body adjusts a degree of a valve opening based on a movement of the movable core in the retainer cylinder, and wherein the movement of the movable core is based on an electromagnetic force that is generated between the stationary core and the movable core in accordance with an electric current supplied to the coil.

A method of adjusting the amount of movable extent of a movable core in a control valve operating fluid flow that goes through the control valve, the control valve having,

• a retainer cylinder including a first cylindrical member made of non-magnetic material and a second cylindrical member made of magnetic material, the second cylindrical member having a bottom portion,
• a stationary core disposed in the retainer cylinder,
• a movable core disposed in the retainer cylinder, wherein the movable core is located between the stationary core and the bottom portion of the second cylindrical member,
• a shim made of non-magnetic material, the shim is disposed in the retainer cylinder and located between the movable core and the bottom portion of the second cylindrical member,
• a coil disposed around the retainer cylinder, and
• a valve body movably linked with the movable core, wherein the valve body adjusts a degree of a valve opening based on a movement of the movable core in the retainer cylinder, wherein the movement of the movable core is based on an electromagnetic force in accordance with an electric current supplied to the coil, the method comprising:
• adjusting a thickness of the shim so that the amount of movable extent of the movable core in the retainer cylinder is adjusted.