Variable displacement wobble plate type compressor with wobble angle control valve

A variable displacement wobble plate type compressor adapted for use in an air-conditioning circuit of a vehicle, comprising:

• a housing element having therein a suction chamber for a refrigerant before compression and a discharge chamber for a refrigerant after compression;
• a cylinder block defining therein a plurality of cylinder bores arranged so as to surround an axial drive shaft and having therein associated reciprocatory pistons disposed so as to draw the refrigerant from the suction chamber and to then discharge the refrigerant after compression into the discharge chamber;
• a crankcase having defined therein a chamber communicating with the cylinder bores and containing therein a drive plate mounted in such a manner that it is capable of rotating with the drive shaft as well as changing an inclination thereof with respect to the drive shaft and a non-rotating wobble plate held by the drive plate;
• a plurality of connecting rods connected between said wobble plate and the pistons;
• a first passageway means for fluidly communicating said chamber of said crankcase with said discharge chamber of said housing element;
• a first valve means arranged in said first passageway means, for opening and closing said first passageway means;
• a second passageway means for providing a fluid communication between said chamber of said crankcase and said suction chamber of said housing element;
• a second valve means arranged in said second passageway means, for varying an extent of opening of a part of said second passageway means;
• a first valve control means including a first means for sensing a change in a fluid pressure value indicative of a change in a refrigerating load applied to said air-conditioning circuit, with respect to a predetermined first level, and a second means for controlling an operation of said first valve means in response to a signal from said first means, said first valve control means mechanically moving said first valve means between a first position opening a part of said first passageway means and a second position closing said part of said first passageway means, and;
• a second valve control means including a first actuating means for electrically actuating said second valve means in response to at least one of electrical signals indicating a change in a physical value relative to said air-conditioning circuit and the vehicle to be air-conditioned, respectively, said first actuating means of said second valve control means moving said second valve means between a first position minimizing the extent of opening of said part of said second passageway means and a second position maximizing the extent of opening of said part of said second passageway means.