Variable displacement swash plate type compressor

Abstract

Provided is a compressor, in which discharge capacity is changed by an actuator, exhibiting high controllability while realizing reduction in size. In the compressor, a movable body includes a rear wall, a circumferential wall, and a coupling mechanism. The coupling mechanism includes a first arm provided with a first pulling point and a second arm provided with a second pulling point. In the compressor, when the inclination angle of a swash plate is increased, the movable body pulls the swash plate via the first and second arms. At this time, in the compressor, pulling force can be applied at two points, i.e., at the first pulling point and the second pulling point. Consequently, in the compressor, even when the size of the rear wall and the circumferential wall is increased, the rigidity of the first and second arms can be made lower.

1 . A variable displacement swash plate type compressor comprising:
 a housing in which a suction chamber, a discharge chamber, a swash plate chamber, and at least one cylinder bore are formed;   a drive shaft extending along a drive axis and rotatably supported in the housing;   a swash plate rotatable in the swash plate chamber along with rotation of the drive shaft;   a link mechanism that is provided between the drive shaft and the swash plate and permits change of an inclination angle of the swash plate in a direction perpendicular to the drive axis of the drive shaft;   a piston reciprocally accommodated in the cylinder bore;   a conversion mechanism that reciprocates the piston in the cylinder bore along with rotation of the swash plate at a stroke corresponding to the inclination angle;   an actuator that is disposed in the swash plate chamber and capable of changing the inclination angle; and   a control mechanism that controls the actuator, wherein   the suction chamber and the swash plate chamber communicate with each other,   the actuator includes a partition body provided on the drive shaft, a movable body that is coupled to the swash plate via a coupling mechanism and movable with respect to the partition body along the drive axis of the drive shaft, and a control pressure chamber that is defined by the partition body and the movable body and moves the movable body by introducing a refrigerant from the discharge chamber,   the movable body is disposed so as to increase the inclination angle by pulling the swash plate when pressure in the control pressure chamber increases,   the link mechanism includes a coupling portion that is coupled to the swash plate, and   the coupling mechanism is disposed on an opposite side of the coupling portion with respect to the drive shaft and includes a first arm and a second arm provided at the movable body across the drive axis.   
     
     
         2 . The variable displacement swash plate type compressor according to  claim 1 ,
 wherein the at least one cylinder bore comprises at least a first cylinder bore, a second cylinder bore, and a third cylinder bore,   the first cylinder bore, the second cylinder bore, and the third cylinder bore are arranged concentrically at equal angular intervals around the drive axis in the housing,   a first imaginary region and a second imaginary region are set in the swash plate chamber, the first imaginary region being defined by a first tangential line drawn from the drive axis to the first cylinder bore at a side of the second cylinder bore and a second tangential line drawn from the drive axis to the second cylinder bore at a side of the first cylinder bore, the second imaginary region being defined by a third tangential line drawn from the drive axis to the second cylinder bore at a side of the third cylinder bore and a fourth tangential line drawn from the drive axis to the third cylinder bore at a side of the second cylinder bore, and   the first arm is located within the first imaginary region and the second arm is located within the second imaginary region.   
     
     
         3 . The variable displacement swash plate type compressor according to  claim 1 ,
 wherein the swash plate is provided with a pulled portion that protrudes between the first arm and the second arm, and   a driving force is transmitted between the first arm, the second arm, and the pulled portion.   
     
     
         4 . The variable displacement swash plate type compressor according to  claim 3 , wherein a pin extending in a direction perpendicular to the drive axis is inserted through the first arm, the pulled portion, and the second arm.