Swash plate type compressor with variable displacement mechanism

A swash plate type compressor comprising:

• a compressor housing including an annular casing and an end plate;
• a suction chamber and a discharge chamber formed in said end plate;
• a cylinder block having a plurality of cylinders therein;
• a valve plate disposed between said cylinder block and said end plate;
• a piston slidably disposed in each of said cylinder blocks;
• a drive shaft rotatably supported in said cylinder block;
• a swash plate disposed on said drive shaft and operatively coupled to said pistons for converting rotating motion of said drive shaft into reciprocating motion of said pistons;
• a control chamber formed in said end plate for accumulating working fluid;
• an actuator slidably disposed in a first bore in said cylinder block such that a rear end thereof is exposed to the working fluid pressure in said control chamber;
• a first communication path formed between said control chamber and said discharge chamber;
• a second communication path formed between said control chamber and said suction chamber;
• and
• a valve control means disposed in said second communication path for selectively opening and closing said second communication path;
• said first communication path comprising a second bore formed in said cylinder block and a radial bore formed in said cylinder block, said second bore having one end opening into said discharge chamber and a second end terminating in said cylinder block and said radial bore having a first end opening into said second bore and a second end opening into said first bore.

A swash plate type compressor comprising:

• a compressor housing including an annular casing and an end plate;
• a suction chamber and a discharge chamber formed in said end plate;
• a cylinder block having a plurality of cylinders therein;
• a valve plate disposed between said cylinder block and said end plate;
• a piston slidably disposed in each of said cylinder blocks;
• a drive shaft rotatably supported in said cylinder block;
• a swash plate disposed on said drive shaft and operatively coupled to said pistons for converting rotating motion of said drive shaft into reciprocating motion of said pistons;
• a control chamber formed in said end plate for accumulating working fluid;
• an actuator slidably disposed in a first bore in said cylinder block such that a rear end thereof is exposed to the working fluid pressure in said control chamber;
• a first communication path formed between said control chamber and said discharge chamber;
• a second communication path formed between said control chamber and said suction chamber;
• a valve control means disposed in one of said communication paths for selectively opening and closing one of said communication paths;
• and
• a capillary tube disposed in said second bore for introducing discharge pressure into said first communication path, said capillary tube continuously bleeding discharge pressure to said control chamber.

A swash plate type compressor comprising:

• a compressor housing including an annular casing and an end plate;
• a suction chamber and a discharge chamber formed in said end plate;
• a cylinder block having a plurality of cylinders therein;
• a valve plate disposed between said cylinder block and said end plate;
• a piston slidably disposed in each of said cylinder blocks;
• a drive shaft rotatably supported in said cylinder block;
• a swash plate disposed on said drive shaft and operatively coupled to said pistons for converting rotating motion of said drive shaft into reciprocating motion of said pistons;
• a control chamber formed in said end plate for accumulating working fluid;
• an actuator slidably disposed in a first bore in said cylinder block such that a rear end thereof is exposed to the working fluid pressure in said control chamber;
• a first communication path formed between said control chamber and said discharge chamber;
• a second communication path formed between said control chamber and said suction chamber;
• a valve control means disposed in one of said communication paths for selectively opening and closing one of said communication paths;
• and
• a tilt control mechanism operatively coupled to said swash plate for changing the capacity of the compressor, said tilt control mechanism comprising:
• a first rotor plate mounted on said drive shaft;
• and
• a second rotor plate slidably mounted on said drive shaft and spaced from said first rotor plate;
• said swash plate mounted on said drive shaft between said first and second rotor plates, said second rotor plate having an end surface rotatably disposed against said actuator so that when said actuator slides within said first bore, said swash plate is selectively biased through said second rotor plate between a minimum and maximum swash plate angle.

A swash plate type compressor comprising:

• a compressor housing including an annular casing and an end plate;
• a suction chamber and a discharge chamber formed in said end plate;
• a cylinder block having a plurality of cylinders therein;
• a valve plate disposed between said cylinder block and said end plate;
• a piston slidably disposed in each of said cylinder blocks;
• a drive shaft rotatably supported in said cylinder block;
• a swash plate disposed on said drive shaft and operatively coupled to said pistons for converting rotating motion of said drive shaft into reciprocating motion of said pistons;
• a control chamber formed in said end plate for accumulating working fluid;
• an actuator slidably disposed in a first bore in said cylinder block such that a rear end thereof is exposed to the working fluid pressure in said control chamber;
• a first communication path formed between said control chamber and said discharge chamber;
• a second communication path formed between said control chamber and said suction chamber;
• a valve control means disposed in one of said communication paths for selectively opening and closing one of said communication paths;
• and
• a tilt control mechanism for controlling the slant angle of said swash plate, said tilt control mechanism comprising:
• a first rotor disposed on said drive shaft;
• and
• a second rotor disposed on said drive shaft and spaced from said first rotor;
• said swash plate disposed between said first and second rotors and operatively coupled to at least one of said first and second rotors for rotation therewith.

A swash plate type compressor comprising:

• a compressor housing including an annular casing and an end plate;
• a cylinder block operatively coupled to said annular casing and said end plate and having a plurality of cylinders formed therein;
• a plurality of pistons slidably disposed in said cylinders;
• a crank chamber formed on one side of said cylinder block opposite said end plate;
• a valve plate disposed between said end plate and said cylinder block;
• a suction chamber and a discharge chamber formed in said end plate;
• a drive shaft rotatably mounted on said cylinder block;
• a swash plate mounted on said drive shaft in said crank chamber and operatively coupled to said pistons, said swash plate converting rotating motion of said drive shaft into reciprocating motion of said pistons;
• and
• a tilt control means for changing the angle of said swash plate, said tilt control means comprising:
• a first rotor plate mounted on said drive shaft adjacent said swash plate, said first rotor having a frustoconical surface and a projection extending therefrom;
• and
• a second rotor plate slidably mounted on said drive shaft on an opposite side of said swash plate from said first rotor, said second rotor including a frustoconical surface;
• said swash plate including a first arm extending toward said first rotor and a second arm extending toward said second rotor, said first and second arms disposed in sliding contact with said respective frustoconical surfaces.