Variable displacement swash plate type compressor

Abstract

Provided is a variable displacement swash plate type compressor including a cylinder block having a plurality of cylinder bores, a front housing disposed in the front of the cylinder block to form a swash plate chamber, a drive shaft rotatably supported by the cylinder block, a lug plate disposed in the swash plate chamber of the front housing and fixed to the drive shaft, a rear housing disposed in the rear of the cylinder block to form a suction chamber and a discharge chamber in communication with the cylinder bores through suction/discharge valves, a swash plate rotated by the lug plate to vary its inclination angle, a spring supported between the lug plate and the swash plate, and pistons slidably engaged with the swash plate and reciprocally accommodated in the cylinder bores, characterized in that a power transmission groove is formed at a rear part of the lug plate opposite to the swash plate, a hooking projection inserted into the power transmission groove is formed at a front part of the swash plate opposite to the lug plate, and slide blocks are installed at a pin projecting from both sides of the hooking projection to be interposed between an inner side surface of the power transmission groove and an outer side surface of the hooking projection.

1 . A variable displacement swash plate type compressor comprising: a cylinder block having a plurality of cylinder bores, a front housing disposed in the front of the cylinder block to form a swash plate chamber, a drive shaft rotatably supported by the cylinder block, a lug plate disposed in the swash plate chamber of the front housing and fixed to the drive shaft, a rear housing disposed in the rear of the cylinder block to form a suction chamber and a discharge chamber in communication with the cylinder bores through suction/discharge valves, a swash plate rotated by the lug plate to vary its inclination angle, a spring supported between the lug plate and the swash plate, and pistons slidably engaged with the swash plate and reciprocally accommodated in the cylinder bores, characterized in that a power transmission groove is formed at a rear part of the lug plate opposite to the swash plate, a hooking projection inserted into the power transmission groove is formed at a front part of the swash plate opposite to the lug plate, and slide blocks are installed at a pin projecting from both sides of the hooking projection to be interposed between an inner side surface of the power transmission groove and an outer side surface of the hooking projection. 
   
   
       2 . The variable displacement swash plate type compressor according to  claim 1 , wherein, when seen from a side view, a rear surface of the power transmission groove in contact with periphery surfaces of the slide blocks projects toward the drive shaft in a tilted direction. 
   
   
       3 . The variable displacement swash plate type compressor according to  claim 2 , wherein the rear surface of the power transmission groove has two inclined guide surfaces for guiding movement of the periphery surfaces of the slide blocks, and a rear groove formed between the two inclined guide surfaces. 
   
   
       4 . The variable displacement swash plate type compressor according to  claim 2 , wherein the groove is inclined along a rear surface inclination of the power transmission groove. 
   
   
       5 . The variable displacement swash plate type compressor according to  claim 1 , wherein a sleeve is disposed between the drive shaft and an inner surface of an insert hole of the swash plate to be reciprocally installed at the drive shaft, wherein the sleeve has a coupling hole through which the drive shaft is relatively movably inserted, and cylindrical guide projections formed at both sides of the coupling hole, and guide grooves coupled with the guide projections of the sleeve are formed at an inner surface of an insert hole of the swash plate. 
   
   
       6 . The variable displacement swash plate type compressor according to  claim 5 , wherein an outer surface of the sleeve being faced with the insert hole of the swash plate has a convex curved surface. 
   
   
       7 . The variable displacement swash plate type compressor according to  claim 1 , wherein the pin coupled with the slide blocks has a cylindrical outer surface. 
   
   
       8 . The variable displacement swash plate type compressor according to  claim 1 , wherein a stopper is installed at the drive shaft behind the swash plate. 
   
   
       9 . The variable displacement swash plate type compressor according to  claim 5 , wherein the spring is disposed between a rear surface of the lug plate and a front surface of the sleeve. 
   
   
       10 . The variable displacement swash plate type compressor according to  claim 1 , wherein reinforcement ribs are formed to cross a rear surface of the lug plate and opposite side surfaces of the power transmission groove. 
   
   
       11 . The variable displacement swash plate type compressor according to  claim 1 , wherein grooves hooked by the pin are formed at both inner side surfaces of the power transmission groove.