Variable capacity wobble plate compressor with prompt capacity control

A variable capacity wobble plate compressor comprising:

• a housing defining therein a crankcase, a lower pressure space, and a higher pressure space;
• a drive shaft rotatably disposed in said housing;
• a cylinder block arranged in said housing and defining therein a plurality of cylinders circumferentially arranged around said drive shaft and extending substantially parallel to the axis of said drive shaft, each of said cylinders having an interior thereof disposed for communication with said lower pressure space and said higher pressure space;
• pistons received in respective ones of said cylinders for reciprocating motions therein;
• said crankcase having an interior thereof disposed to be supplied with blow-by gas from said cylinders when said pistons thereof are on compression and suction strokes;
• a wobble plate arranged in said crankcase and pivotally and slidably fitted on said drive shaft for rotation together therewith, said pistons engaging said wobble plate for reciprocating motions in said respective ones of said cylinders as said wobble plate rotates;
• a pivot forming a first fulcrum supporting said wobble plate at a diametrically central location thereof and axially movable along said drive shaft;
• and an arm member rotatable together with said drive shaft about the axis of said drive shaft, said arm member forming a second fulcrum supporting said wobble plate at a location radially spaced from said drive shaft, whereby said second fulcrum is rotatable about the axis of said drive shaft together with said arm member;
• said wobble plate having an angle of axial inclination thereof relative to said drive shaft variable about said second fulcrum for varying displacement of said pistons in response to the difference between resultant reaction force exerted by said pistons on compression strokes thereof and pressure in said crankcase acting upon said pistons as back pressure;
• a first passage having an orifice and communicating said lower pressure space with the interior of said crankcase for permitting escape of internal pressure in the latter into the former;
• a second passage communicating said higher pressure space with the interior of said crankcase for introducing internal pressure in the former to the latter;
• and a control valve means for controlling the opening of said second passage.