Double- headed piston type swash plate compressor

Abstract

A double-headed piston type swash plate compressor has a first abutting portion provided between a first housing member and a first cylinder block and a second abutting portion provided between a second housing member and a second cylinder block. The first abutting portion is located inside a first circumcircle of the group of first cylinder bores and causes the first housing member and the first cylinder block to make metal-to-metal contact. The second abutting portion is located inside a second circumcircle of the group of second cylinder bores and causes the second housing member and the second cylinder block to make metal-to-metal contact.

1 . A double-headed piston type swash plate compressor comprising:
 a first cylinder block, which is made of metal and has a plurality of first cylinder bores;   a first housing member, which is made of metal and arranged on a first side of the first cylinder block;   a first gasket, which is arranged between the first housing member and the first cylinder block and seals a boundary between the first housing member and the first cylinder block;   a second cylinder block, which is made of metal and is arranged on a second side of the first cylinder block that is opposite to the first side, wherein the second cylinder block has a plurality of second cylinder bores and, together with the first cylinder block, defines a swash plate chamber;   a second housing member, which is made of metal, wherein, when a side of the second cylinder block that faces the first cylinder block is defined as a first side, the second housing member is arranged on a second side of the second cylinder block that is opposite to the first side;   a second gasket, which is arranged between the second cylinder block and the second housing member and seals a boundary between the second cylinder block and the second housing member;   a drive shaft, which is rotationally supported by the first cylinder block and the second cylinder block;   a swash plate, which is rotational in the swash plate chamber by rotation of the drive shaft;   double-headed pistons, which are reciprocal in the first cylinder bores and the second cylinder bores by rotation of the swash plate;   a first thrust bearing, which is arranged between the first cylinder block and the drive shaft and bears thrust acting on the drive shaft;   a second thrust bearing, which is arranged between the second cylinder block and the drive shaft and bears thrust acting on the drive shaft;   a first abutting portion, wherein, when a circumcircle of the group of the first cylinder bores is defined as a first circumcircle, the first abutting portion is located between the first housing member and the first cylinder block and inside the first circumcircle, and the first abutting portion causes the first housing member and the first cylinder block to make metal-to-metal contact; and   a second abutting portion, wherein, when a circumcircle of the group of the second cylinder bores is defined as a second circumcircle, the second abutting portion is located between the second housing member and the second cylinder block and inside the second circumcircle, and the second abutting portion causes the second housing member and the second cylinder block to make metal-to-metal contact.   
     
     
         2 . The double-headed piston type swash plate compressor according to  claim 1 , wherein
 the first abutting portion is located inside a first imaginary circle, which passes through centers of the first cylinder bores, and   the second abutting portion is located inside a second imaginary circle, which passes through centers of the second cylinder bores.   
     
     
         3 . The double-headed piston type swash plate compressor according to  claim 2 , wherein
 when an incircle of the group of the first cylinder bores is defined as a first incircle, the first abutting portion is located inside the first incircle, and   when an incircle of the group of the second cylinder bores is defined as a second incircle, the second abutting portion is located inside the second incircle.   
     
     
         4 . The double-headed piston type swash plate compressor according to  claim 3 , wherein
 the first thrust bearing and the first cylinder block contact each other at a first contact portion,   the second thrust bearing and the second cylinder block contact each other at a second contact portion,   when the first contact portion and the first abutting portion are viewed in an axial direction of the drive shaft, at least a part of the first abutting portion is in a position overlapping the first contact portion, and   when the second contact portion and the second abutting portion are viewed in the drive shaft axial direction, at least a part of the second abutting portion is in a position overlapping the second contact portion.   
     
     
         5 . The double-headed piston type swash plate compressor according to  claim 1 , further comprising a link mechanism, which is located in the swash plate chamber and between the drive shaft and the swash plate, wherein the link mechanism allows an inclination angle of the swash plate to be changed relative to a direction perpendicular to an axial direction of the drive shaft,
 wherein the double-headed pistons are reciprocal in the first and second cylinder bores by a stroke corresponding to the inclination angle of the swash plate.   
     
     
         6 . The double-headed piston type swash plate compressor according to  claim 5 , further comprising:
 an actuator, which is located in the swash plate chamber and configured to change the inclination angle; and   a control mechanism, which controls the actuator,   wherein the actuator includes   a partition body provided on the drive shaft,   a movable body, which is coupled to the swash plate and fitted about the drive shaft to be movable in the drive shaft axial direction, and   a control pressure chamber, which is defined by the partition body and the movable body, wherein the control pressure chamber uses an internal pressure thereof to move the movable body.