Variable capacity compressor

Abstract

A variable capacity compressor includes: cylinder bores; a drive shaft; a rotor fixed with the drive shaft; a link for linking the rotor and a journal; a tilting plate capable of changing its tilted angle; and pistons capable of reciprocating within the cylinder bores along with a rotation of the tilting plate. Each reciprocating stroke of the pistons is adjusted according to the tilted angle of the tilting plate. The link is linked with the rotor via a first pivot and linked with the journal via a second pivot. An arrangement of the first and second pivot is set so that each head clearance of the pistons decreases as a discharge capacity decreases toward its minimum value within a small discharge capacity range. According to the compressor, it can be prevented that the discharge flaw amount is cut off abruptly and the tilted angle can be sustained stably.

1 . A variable capacity compressor comprising:
 a housing within which a plurality of cylinder bores and a crank chamber communicating with the plurality of cylinder bores are provided;   a drive shaft rotatably supported within the housing;   a rotor fixed with the drive shaft;   a link for linking the rotor and a journal;   a tilting plate capable of changing a tilted angle thereof by a movement of the journal; and   a plurality of pistons capable of reciprocating within the plurality of cylinder bores, respectively, due to a swinging rotation of the tilting plate;   wherein   the tilted angle of the tilting plate is changed due to a rotation of the rotor by way of the link,   each reciprocating stroke of the plurality of pistons is adjusted according to the tilted angle of the tilting plate,   the link is linked with the rotor via a first pivot and linked with the journal via a second pivot, and   an arrangement of the first and second pivot is set so that each head clearance of the plurality of pistons decreases as a discharge capacity decreases toward a minimum value thereof within a small discharge capacity range.   
   
   
       2 . The compressor according to  claim 1 , wherein
 a ratio of a head clearance B at the top dead center of the piston to a stroke A of the piston shall be defined as a stroke ratio B/A, and   the arrangement of the first and second pivot is set so that the stroke rate B/A is made constant or decreases as the discharge capacity decreases within the small discharge capacity range.   
   
   
       3 . The compressor according to  claim 1 , wherein
 the link is configured so that the first pivot is arranged nearer to the journal than the second pivot and the second pivot is arranged nearer to the rotor than the first pivot.