Patent ID: 6659733
Filing Date: 2003-12-09
Classification: F04B

Abstract:
A compressor, the displacement of which varies depending on the internal pressure of a crank chamber, the compressor comprising:a housing including a cylinder block and a valve plate, which is connected to the cylinder block, wherein the cylinder block includes a cylinder bore and a central supporting hole; a piston housed in the cylinder bore, wherein the piston compresses gas drawn into the cylinder bore through the valve plate and discharges compressed gas from the cylinder bore through the valve plate; a drive shaft supported in the housing, the drive shaft having an end portion located in the supporting hole; a drive plate connected to the piston for converting rotation of the drive shaft into reciprocating motion of the piston, wherein the drive plate is supported on the drive shaft and can incline with respect to the drive shaft between a maximum inclination position and a minimum inclination position depending on the internal pressure of the crank chamber, wherein the inclination of the drive plate determines the stroke of the piston and the displacement of the compressor; a movable body housed in the supporting hole, wherein the movable body is hollow and permitted to move axially, and the end portion of the drive shaft is supported by the cylinder block through the movable body; and an urging member for urging the movable body toward the drive plate, wherein the movable body is moved axially as the drive plate is inclined, and when the drive plate is located at the minimum inclination angle position, the valve plate receives force from the drive plate through the movable body.