Patent ID: 7690898

Claim:
A control valve for a variable displacement compressor comprising: a valve rod having a valve body part; a valve main body including a guiding hole in which the valve rod is slidably and fitly inserted, a valve chamber having a valve port to/from which the valve body part contacts/separates, a discharge pressure refrigerant inlet provided at the upstream side of the valve port for introducing refrigerant having discharge pressure from a compressor, and a refrigerant outlet provided at the downstream side of the valve port so as to communicate with a crank chamber of the compressor; an electromagnetic actuator having a plunger for moving the valve rod in the valve closing direction; a pressure sensing chamber in which a suction pressure is introduced from the compressor; and a pressure sensitive response member for pressing the valve rod in the valve opening direction corresponding to the pressure of the pressure sensing chamber, wherein, although the valve rod is forcedly moved in the valve closing direction by the plunger, the valve rod is fitted to the plunger having a predetermined diametrical directional clearance all around said valve rod so as not to be influenced by lateral deviation and inclination of the plunger in any transverse or lateral direction, the valve rod being formed with a small diameter part; the valve rod being formed on an upper side of the small diameter part with a large diameter part serving as the locking part for forcedly moving; a center hole in which the small diameter part is fitly inserted being provided at a center of the plunger, the center hole having a center line; an eccentric hole capable of receiving the large diameter part being provided in the plunger so as to have an eccentricity of a predetermined distance in the diametrical direction and to partially overlap with the center hole in order to facilitate assembly, the eccentric hole having a center line spaced in the diametrical direction from the center line of the center hole; and a clearance formed between the small diameter part and the center hole being larger than a clearance formed between the plunger and a guiding pipe arranged around an outer periphery of the plunger.