Patent ID: 6149401
Filing Date: 2000-11-21
Classification: F04B,F04C

Abstract:
A compressor for a refrigerant cycle, driven by an engine for driving a vehicle, said compressor comprising:a compression unit having an inlet for sucking refrigerant, an outlet for discharging refrigerant and a compression room in which refrigerant is sucked and compressed, said compression unit being rotated with a rotation of the engine; anda discharge-amount varying unit which varies an amount of refrigerant discharged from said compression unit, said discharge-amount varying unit includinga first control room communicating with said inlet and outlet of said compression unit,a control passage through which either one of said inlet and outlet of said compression unit communicates with said first control room,a valve for opening and closing said control passage,a second control room for applying a pressure to said valve in a first direction for closing said control passage,a third control room for applying a pressure to said valve in a second direction for opening said control passage, andan elastic member which applies an elastic force to said valve in the first direction, wherein:said discharge-amount varying unit reduces the discharge amount of refrigerant from said compression unit according to a pressure variation of said first control room;either one of said inlet and outlet of said compression unit communicates with either one of said second control room and said third control room; andsaid second and third control rooms communicates with each other to have a pressure difference therebetween, when a rotation speed of said compression unit is accelerated.