Variable displacement compressor

A variable displacement compressor comprising:

• a housing including a crank chamber and a cylinder block having a plurality of cylinders;
• a plurality of pistons disposed in respective ones of said cylinders;
• a drive shaft rotatably mounted in said housing;
• a drive plate mounted on said drive shaft for rotating integrally with said drive shaft;
• a rotary journal pivotally coupled with said drive plate for rotating synchronously with said drive plate, said rotary journal being slidable along said drive shaft;
• a swash plate, supported on said rotary journal, for driving said pistons in a reciprocal motion for compressing a fluid, wherein the inclination angle of said swash plate is controlled in relation to the pressure in each of said cylinders and the internal pressure of the crank chamber;
• and
• at least one pin means, mounted pivotally on said drive plate, for coupling said drive plate and said rotary journal, said pin means having a ball portion and a rod portion;
• said drive plate having at least one spherical opening for retaining therein said ball portion of said pin means;
• and
• said drive journal having at least one guide hole for retaining the rod portion of said pin means, said pin means sliding along said guide hole when said rotary journal pivots with respect to said drive plate;
• whereby said pin means is adapted in such a way that points Mk, where the load generated by the pressure on a selected piston is transmitted to said drive plate, is not substantially shifted regardless of the inclination angle of said swash plate.

A variable displacement compressor comprising:

• a housing including a crank chamber and a cylinder block having a plurality of cylinders;
• a plurality of pistons disposed in respective ones of said cylinders;
• a drive shaft rotatably mounted in said housing;
• a drive plate mounted on said drive shaft for rotating integrally with said drive shaft;
• a rotary journal coupled to said drive plate for rotation synchronously with and driven by said drive plate, said journal being mounted on said drive shaft for pivotal movement to variable inclination angles relative to said drive shaft accompanied by movement axially along said drive shaft;
• a swash plate, supported on said rotary journal, for driving said pistons in a reciprocal motion for compressing a fluid, wherein the inclination angle of said swash plate is controlled in relation to the pressure in each of said cylinders and the internal pressure of the crank chamber;
• and
• pin means, mounted pivotally on said drive plate, for coupling said drive plate with said rotary journal, said pin means being adapted to slide with respect to said rotary journal, and to pivot with respect to said drive plate, when said rotary journal pivots with respect to said drive plate;
• whereby the top dead center clearance of said pistons in said cylinders is maintained substantially constant for all of said inclination angles of said swash plate.