PURPOSE: To suppress the torque fluctuation of a compressor by disposing mechanism provided with a cutoff body for gradually throttling or increasing the inflow quantity of refrigerant gas flowing into an intake chamber from an external refrigerant circuit, and improve lubrication so as to enable the smooth action of the cutoff body by disposing the outlet of a pressure discharge passage clowns stream.
CONSTITUTION: A cutoff body 21 for opening/closing an intake passage 54 for leading refrigerant gas into an intake chamber 3a from an external refrigerant circuit 49 is supported in the slidable and relatively rotatable state to a rotary shaft 9. The cutoff body 21 is interlocked with the sliding motion of a cam plate supporting body 14. In addition, when the cutoff body 21 is in the closed position, the inclination of the cam plate 15 is held to the minimum inclination without being 0°. A part 60 of a pressure discharge passage 63 is formed in a sliding contact area between the cutoff body 21 and the rotary shaft 9. On the other hand, the outlet of the pressure discharge passage 63 is disposed downstream of the cutoff position of the intake passage 54 cut off by the cutoff body 21. The sudden fluctuation of discharge pressure is thereby prevented, and the sliding contact area is always lubricated so as to ensure the smooth action the cutoff body 21.
SONOBE MASANORI
MIZUFUJI TAKESHI
YOKONO TOMOHIKO
