Variable displacement swash plate type compressor includes casing, rotating shaft, swash plate, piston, and inclination adjustment mechanism with first flow path connecting discharge chamber with crankcase and second flow path connecting crankcase with suction chamber to adjust inclination angle of the swash plate. An orifice hole decompressing fluid passing through the second flow path is formed in the second flow path. An orifice control mechanism controlling effective flow cross-sectional area of the orifice hole is formed on the second flow path. The orifice hole and control mechanism are formed to increase differential pressure in the crankcase and suction chamber, the effective flow cross-sectional area increases, and with further differential pressure increase it becomes a second area larger than zero and less than the first area. Achieved is rapid control of refrigerant discharge amount and prevention of reduction in compressor efficiency with reduction of time to switch to the maximum mode.

A variable-capacity compressor control valve is configured for easily regulating the opening degree of an in-valve release passage, and thus can effectively reduce internal circulation of refrigerant within the compressor and effectively improve the operation efficiency of the compressor. An in-valve large-opening release passage with a relatively large opening degree, which is used during the compressor actuation time, and an in-valve small-opening release passage with a relatively small opening degree, which is used during both the compressor actuation time and the normal control time (i.e., Pd.fwdarw.Pc control time), are formed using different passages.

A variable displacement compressor capable of preventing delay in pressure release of a controlled pressure chamber, such as a crank chamber. A switching valve (350) disposed downstream of a control valve of a pressure supply passage includes a main valve body (352) and a sub valve body (400). The main valve body (352) includes an internal passage (352d) providing communication between a first valve hole (104e1) communicating with a pressure supply passage (145a) between the control valve and the switching valve (350), and a second valve hole (151a) communicating with a pressure supply passage (145b) between the switching valve (350) and the crank chamber. The main valve body (352) provides communication between the second valve hole (151a) and a pressure release hole (351a1) communicating with the suction chamber, when pressure Pm in the pressure supply passage (145a) is lower than pressure Pc in the crank chamber. The sub valve body (400) closes the internal passage (352d) of the main valve body (352), when pressure Pm is lower than pressure Pc. The sub valve body (400) is lighter than the main valve body (352), and thus, when pressure Pm decreases, the sub valve body (400) actuates before the main valve body (352), to close the internal passage (352d) of the main valve body (352).

In a variable displacement compressor 100, transmitting member 116 transmits rotational motion of rotor 112 to swash plate 111 and supports swash plate 111. Guide member 117 guides inclining motion of swash plate 111 such that a top dead center position of piston 126 is maintained to be substantially constant. Members 116, 117 are separately formed at different portions on a rotor end face 112a. In the variable displacement compressor 100, first contacted member 118 contacted with transmitting member 116, and second contacted member 119 contacted with guide member 117, are separately formed at different portions on swash plate end face 111b. The transmitting member 116 and the first contacted member 118 extend on rotor 112 and swash plate 111, respectively, from a top dead center side region V1 to a bottom dead center side region V2 of the piston.

A capacity control valve includes a valve housing formed with a discharge port, a suction port, and first and second control ports, a rod movably arranged in the valve housing and driven by a solenoid, a CS valve configured to control a fluid flow between the first control port and the suction port in accordance with a movement of the rod, and a DC valve configured to control a fluid flow between the second control port and the discharge port in accordance with the movement of the rod. In a non-energization state, the CS valve is closed and the DC valve is closed. As the energization of the solenoid becomes larger, the CS valve transitions from a closed state to an open state and the DC valve transitions from a closed state to an open state.

A capacity control valve includes a valve housing formed with a discharge port, a suction port, and first and second control ports, a rod driven by a solenoid, a CS valve configured to control a fluid flow between the first control port and the suction port in accordance with a movement of the rod, and a DC valve configured to control a fluid flow between the second control port and the discharge port in accordance with a movement of the rod.

Provided is a displacement control valve capable of quickly reducing pressure in a control chamber to a level of pressure kept during continuous driving, at the time of the startup of a variable displacement compressor. The valve housing is provided with a through hole constituting a part of a first communicating passage that communicates with a pressure chamber at one end thereof and that is communicable with a second valve chest at the other end thereof.

Provided is a variable displacement compressor capable of preventing intrusion of foreign matter into a second control valve. A variable displacement compressor 100 is equipped with a first control valve 300 controlling the opening degree of a supply passage 145, a check valve 350, a second control valve 400 controlling the opening degree of a discharge passage 146, and a back-pressure relief passage 147. The second control valve 400 has a back-pressure chamber 410 communicating with an intermediate supply passage 145b1, a valve chamber 420 in which a valve hole 103d and a discharge hole 431a are open and which constitutes a part of the discharge passage 146, a dividing member 430 dividing the back-pressure chamber 410 and the valve chamber 420 from each other, and a spool 440. In a state in which the first control valve 300 closes the supply passage 145 and in which a valve seat side end surface 442a of a valve portion 442 of the spool 440 is spaced away from a valve seat 103f to a maximum degree, an end wall side end surface 442b of the valve portion 442 abuts an end wall 432 of the dividing member 430, whereby communication between the valve chamber 420 and the back-pressure chamber 410 via a through-hole 432a of the end wall 432 is cut off.

Provided is a variable displacement compressor that is directed to cost reduction and productivity enhancement of a second control valve that adjusts an opening degree of a discharge passage for discharging a refrigerant in a controlled pressure chamber to a suction chamber. The variable displacement compressor includes the second control valve (400) configured to decrease an opening degree of the discharge passage to a minimum value when a first end surface (421a) of a valve body (420) accommodated in a valve chamber (410) comes into contact with a first end wall surface (411) of the valve chamber (410) to close a second port (432) and a third port (433), and configured to increase the opening degree of the discharge passage to a maximum value when the first end surface (421a) of the valve body (420) separates from the first end wall surface (411) of the valve chamber (410) to open the second port (432) and the third port (433). The valve body (420) is supported movably in a direction perpendicular to the first end wall surface (411) without contact with a peripheral wall surface (413) of the valve chamber (410), by a guide shaft portion (415a) being slidably inserted into a receiving portion (423) formed at a radially center portion of the valve body (420).

A capacity control valve includes a valve housing provided with a main valve seat; a main valve body that is inserted into the valve housing and includes a main valve portion which is capable of seating on the main valve seat 10a to open and close a communication between a suction port and a control port using a driving force of a solenoid; and a pressure-sensitive body that applies a biasing force to the main valve body in an opening direction according to pressure of a fluid surrounding the pressure-sensitive body. The fluid is supplied from the control port to around the pressure-sensitive body, and the fluid is supplied from the suction port to a back pressure side of the main valve body.