Patent ID: 7806666
Filing Date: 2010-10-05
Classification: F04B

Abstract:
1. A displacement control valve that forms a part of a circulation path of a refrigerant gas and is used in a variable displacement compressor capable of changing a displacement of the refrigerant gas, comprising: a valve housing having a displacement chamber, a valve chamber, and an actuation chamber provided within the valve housing; a solenoid housing having actuation means provided within the solenoid housing; the valve chamber forming a part of a gas passage in which the refrigerant gas flows and having an axis and a valve seat; a valve body being capable of reciprocating along an inner circumferential surface of the valve chamber; the valve body having a valve portion; the valve portion selectively contacting and separating from the valve seat of the valve chamber, whereby the gas passage is selectively opened and closed; a rod having and end portion fixed to the valve body and integrally moving with the valve body; the actuation means actuating the rod for positioning the valve body within the valve chamber; a flow passage provided within the rod and the valve body, and in which the refrigerant gas flows; a guide portion for guiding the reciprocating movement of the valve body along the axis of the valve chamber, wherein the guide portion is arranged on the inner circumferential surface of the valve chamber and sections the valve chamber and the actuation chamber, and a predetermined clearance is formed between an inner circumferential surface of the guide portion and an outer circumferential surface of the valve body; and the valve portion being formed along a surface of an imaginary sphere having a center and a radius, the center of the imaginary sphere being set to an intersection of the axis of the valve chamber with an imaginary surface that orthogonally intersects with the axis and includes a middle point of a length of the guide portion along the axis, the radius of the imaginary sphere being set to a distance from the center of the imaginary sphere to a contact point between the valve seat and the valve portion, wherein in a state where the gas passage is closed when the valve body tilts due to the predetermined clearance between the inner circumferential surface of the guide portion and the outer circumferential surface of the valve body, the valve body is tilted around the center of the imaginary sphere so that the line contact between the valve portion and the valve seat is maintained.