Patent ID: 6358017
Filing Date: 2002-03-19
Classification: F04B

Abstract:
A control valve for a variable displacement compressor, the displacement of which varies in accordance with the pressure in a crank chamber, wherein the compressor includes a suction pressure zone, the pressure of which is a suction pressure, a discharge pressure zone, the pressure of which is a discharge pressure, a bleed passage for releasing gas from the crank chamber to the suction pressure zone, and a supply passage for supplying gas from the discharge pressure zone to the crank chamber, the control valve comprising:an outlet valve mechanism located in the bleed passage to adjust the opening degree of the bleed passage; an inlet valve mechanism located in the supply passage to adjust the opening degree of the supply passage; a transmission member extending between the outlet valve mechanism and the inlet valve mechanism to couple the outlet valve mechanism with the inlet valve mechanism, wherein the transmission member moves axially, and wherein, when the inlet valve mechanism is in an open state, the outlet valve mechanism is in a closed state; an electromagnetic actuator, wherein the actuator axially urges the transmission member by a force, the magnitude of which corresponds to the value of a current supplied to the actuator; and a communication passage formed in the outlet valve mechanism, wherein, when the outlet valve mechanism is in the closed state, the communication passage may be opened, depending on the axial position of the transmission member, for communicating the crank chamber with the suction pressure zone.