Patent ID: 7371054

Claim:
A swash-plate compression device of a variable capacity type, comprising: a swash-plate compressor of the variable capacity type including a rotatable swash plate, which is arranged in a crank chamber of said compressor and of which tilt angle changes depending on pressure in the crank chamber, and a plurality of pistons, which reciprocate individually in cylinder bores of said compressor as the swash plate rotates, thereby alternately increasing and reducing volumes of compression chambers defined in the cylinder bores, and executes a suction process, in which reciprocation of the pistons causes a fluid to be sucked into the compression chambers, and a compression/discharge process, in which the fluid is compressed in the compression chambers and the compressed fluid is discharged as a discharged fluid from the compression chambers; a fluid circuit which allows the discharged fluid to be introduced into and released from the crank chamber; and a control valve in said fluid circuit for controlling and adjusting an actual discharge pressure of the discharged fluid to a target discharge pressure, said control valve including a valve body which is opened and closed to allow at least one of the introduction and release of the discharged fluid, and urging means for urging the valve body in opening and closing directions, individually, the urging means having a first urging force acting on the valve body in one direction according to an actual differential pressure between the actual discharge pressure of the discharged fluid and an internal pressure of the fluid in the compression chamber, and a second urging force acting on the valve body in the direction opposite to the one direction, the second urging force being settled based on a target differential pressure which is requested between the actual discharge pressure and the internal pressure of the fluid in accordance with the target discharge pressure, whereby said control valve autonomously adjusts the pressure in the crank chamber by means of the opening and closing thereof in accordance with difference between the first and second urging forces so that the actual discharge pressure of the discharged fluid is feedback-controlled to be set to the target discharge pressure by means of the tilt angle of the swash plate determined by the autonomous adjustment.