Patent ID: 6540488
Filing Date: 2003-04-01
Classification: F04B

Abstract:
A slant plate-type variable displacement compressor comprising:a housing comprising a crank chamber which is adapted to contain a fluid, a suction chamber, and a discharge chamber, said housing including a cylinder block, wherein a plurality of cylinder bores are formed in said cylinder block; a drive shaft rotatably supported in said cylinder block; a plurality of pistons slidably disposed within said cylinder bores; a slant plate having an angle if tilt and tiltably connected to said drive shaft; a plurality of bearings coupling said slant plate to each of said pistons, so that said pistons reciprocate within said cylinder bores upon rotation of said slant plate; first valve member disposed in a first passage, said first passage communicating between a discharge side of said cylinder bore and said crank chamber, and said first valve member controlled by a suction pressure produced within said cylinder bore; and a second passage communicating between said crank chamber and a suction side of said cylinder bore through an orifice, said second passage allowing pressure to release, wherein a cross-sectional area of said orifice is variable controlled by a linear flow of said fluid through said orifice, such that said cross sectional area of said orifice when a compressor operation begins is greater than that during a capacity control operation.