Variable displacement compressor

Abstract

A variable displacement compressor including a rotary shaft, a swash plate, and a rotary support is disclosed. An inclination angle of the swash plate is changed so that the displacement of the compressor is controlled. The rotary support has a first balance weight and an arm. The swash plate has a second balance weight and a support bracket. At least one of the first balance weight, the second balance weight, the arm, and the support bracket has a slope on a leading side in the rotation direction of the rotary shaft. The slope has a leading end. The slope is shaped to descend in the direction of the rotation axis toward the leading end.

1 . A variable displacement compressor comprising a swash plate tiltably accommodated in a control pressure chamber, wherein refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled, the compressor comprising:
 a rotary shaft having a rotation axis;   a rotary support that rotates integrally with the rotary shaft;   a link mechanism that links the swash platy to the rotary support such that the inclination angle of the swash plate is changeable, wherein the link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate;   a first balance weight that is provided on the rotary support and corresponds to the link mechanism; and   a second balance weight that is provided on the swash plate and corresponds to the link mechanism,   wherein at least one of the first balance weight, the second balance weight, the first appendage, and the second appendage has a slope on a leading side in the rotation direction of the rotary shaft, the slope having a leading end in the rotation direction, and wherein the slope is shaped to descend in the direction of the rotation axes toward the leading end.   
   
   
       2 . A variable displacement compressor comprising a swash plate tiltably accommodated in a control pressure chamber, wherein refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled, the compressor comprising:
 a rotary shaft having a rotation axis;   a rotary support that rotates integrally with the rotary shaft;   a link mechanism that links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable, wherein the link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate;   a first balance weight that is provided on the rotary support and corresponds to the link mechanism; and   a second balance weight that is provided on the swash plate and corresponds to the link mechanism,   wherein at least one of the first balance weight, the second balance weight, the first appendage, and the second appendage has a step on a leading side in the rotation direction of the rotary shaft, and the step is covered with a cover so as to suppress rotational resistance generated as the lubricant in the control pressure chamber is sheared by rotation of the rotary support or the swash plate.   
   
   
       3 . The compressor according to  claim 2 , wherein the rotational resistance suppressing cover as a ring that covers an outer periphery of the rotary support. 
   
   
       4 . The compressor according to  claim 3 , wherein an outer peripheral surface of the ring is a plane of rotation about the rotation axis. 
   
   
       5 . The compressor according to  claim 2 , wherein the rotational resistance suppressing cover is formed of a resin through insert molding. 
   
   
       6 . The compressor according to  claim 2 , wherein the rotational resistance suppression cover covers the outer peripheral surface of the rotary support such that an outer peripheral surfaces of the balance weights and the outer peripheral surface of the cover form a plane of rotation that is formed all around the rotation axis. 
   
   
       7 . A variable displacement compressor comprising a swash plate tiltably accommodated in a control pressure chamber, wherein refrigerant is supplied from a discharge pressure zone to the control pressure chamber, and is discharged therefrom to a suction pressure zone, so that the pressure in the control pressure chamber is adjusted to change an inclination angle of the swash plate, so that the displacement is controlled, the compressor comprising:
 a rotary shaft having a rotation axis;   a rotary support that rotates integrally with the rotary shaft; and   a link mechanism that links the swash plate to the rotary support such that the inclination angle of the swash plate is changeable, wherein the link mechanism includes a first appendage attached to the rotary support and a second appendage attached to the swash plate,   wherein, when at least one of the rotary support and the swash plate is defined as a body of revolution, the body of revolution having, on a surface of a part of the body of revolution except a portion on which the appendage is formed, a plane of rotation that is formed all around the rotation axis, wherein a recess is formed in the plane of rotation, and wherein the recess is located on the same side as the appendage with respect to the axis.   
   
   
       8 . The compressor according to  claim 7 , wherein the rotary support has an opposed surface that is opposed to the swash plate, and the plane of rotation is a back surface that is on an opposite side of the opposed surface. 
   
   
       9 . The compressor according to  claim 1 , wherein the cuter peripheral surface of the rotary support is a plane of rotation about the rotation axis.