Patent Description:
A variable displacement compressor used for an air conditioning system of an automobile, etc. includes a rotating shaft to be driven and rotated by an engine, a swash plate coupled to the rotating shaft in such a manner that a tilt angle is variable, compressing pistons coupled to the swash plate, etc., and by changing the tilt angle of the swash plate, changes a stroke amount of the pistons to control a discharge amount of a fluid. This tilt angle of the swash plate can be continuously changed by appropriately controlling pressure in a control chamber while utilizing a suction pressure Ps of a suction chamber that suctions the fluid, a discharge pressure Pd of a discharge chamber that discharges the fluid pressurized by the pistons, and a control pressure Pc of the control chamber that houses the swash plate, by means of a capacity control valve to be driven to open and close by electromagnetic force.

At the time of continuously driving the variable displacement compressor, the capacity control valve performs normal control in which energization is controlled by a control computer, a valve body is moved in an axial direction by electromagnetic force generated in a solenoid, and a CS valve provided between a control port through which a control fluid of the control pressure Pc passes and a suction port through which a suction fluid of the suction pressure Ps passes is opened and closed to adjust the control pressure Pc of the control chamber of the variable displacement compressor.

During normal control of the capacity control valve, the pressure of the control chamber in the variable displacement compressor is appropriately controlled, and the tilt angle of the swash plate with respect to the rotating shaft is continuously changed, so that the stroke amount of the pistons is changed, and the discharge amount of the fluid to the discharge chamber is controlled, and thereby the air conditioning system is adjusted to a target cooling capacity.

A capacity control valve of Patent Citation <NUM> changes the discharge amount of the fluid to be discharged from the discharge chamber by opening and closing the CS valve to control the fluid of the control pressure Pc to be released from the control chamber to the suction chamber of the variable displacement compressor, and bringing a pressure difference between the discharge pressure Pd of the discharge chamber and the control pressure Pc of the control chamber, each of which is applied in a stroke direction of the pistons, to a target value. In addition, the valve opening degree of the CS valve changes according to an electromagnetic force due to an electric current applied to the solenoid, the target value of the pressure difference is changed according to the change, and the discharge amount of the fluid to be discharged from the discharge chamber is changed.

In addition, in Patent Citation <NUM>, a pressure-sensitive portion including a diaphragm is provided in a pressure-sensitive chamber of the capacity control valve, and the pressure-sensitive portion changes a force to move the valve body according to the suction pressure Ps to adjust the valve opening degree of the CS valve. In addition, the suction fluid of the suction pressure Ps to be supplied to the pressure-sensitive chamber is guided to a back side of the valve body through a communication passage formed in a shaft and a plunger that form the valve body and the solenoid, and influences of the suction pressure Ps applied to both sides of the valve body in a movement direction are cancelled out.

In Patent Citation <NUM> a capacity control valve is described that leaks little fluid and has a wide control range. This capacity control valve is provided with: a valve housing; a main valve body that is inserted through the valve housing, that has a main valve part coming into contact with and separating from a main valve seat, and that opens and closes communication between an intake port and a control port due to the driving force of a solenoid; and a pressure-sensitive body that imparts urging force in an opening direction to the main valve body in accordance with peripheral fluid pressure; wherein a fluid is supplied to the periphery of the pressure-sensitive body from the control port, and the fluid is supplied to a back-pressure side of the main valve body from the intake port.

Further, a variable displacement swash plate type compressor which includes a displacement control valve is described in Patent Citation <NUM>. The displacement control valve includes a drive force transmitting member, a valve member having a first valve body, a pressure sensing mechanism, which adjusts the valve opening degree of the first valve body, a communication passage, which connects a back pressure chamber and an accommodating chamber to each other, and a second valve body, which selectively opens and closes the communication passage. The first valve body opens when current supply to an electromagnetic solenoid is stopped and the pressure in a suction pressure zone is less than a threshold value. The second valve body closes when current is supplied to the electromagnetic solenoid and opens when the current supply to the electromagnetic solenoid is stopped and the pressure in the suction pressure zone is greater than or equal to the threshold value.

In Patent Citation <NUM> a double-headed piston type swash plate compressor is described which includes a swash plate, a double-headed piston, a control pressure chamber, a discharge pressure region, a suction pressure region, a supplying passage, which extends from the discharge pressure region to the control pressure chamber, a narrowing portion, which narrows an opening degree of the supplying passage, and a displacement control valve. The displacement control valve controls a pressure in the control pressure chamber. The displacement control valve includes a driving force transmission rod, a valve chamber, a guide wall, and a back pressure chamber. The back pressure chamber is in communication with the valve chamber through a clearance between the guide wall and the driving force transmission rod. The narrowing portion has a passage cross-sectional area that is larger than a passage cross-sectional area of the clearance.

However, in Patent Citation <NUM>, the controllability of the CS valve is excellent since the influences of the suction pressure Ps are cancelled out, but when the CS valve is opened, a pressure receiving area for the control pressure Pc in the valve body is larger on a pressure receiving surface side to which the control pressure Pc is applied in a valve opening direction. Hence, the control pressure Pc higher than the suction pressure Ps is applied to bias the valve body in the valve opening direction, and the responsiveness of the capacity control valve is decreased, which is a problem. In addition, when the CS valve is opened, the fluid of the control pressure flows around to the back side of the valve body, so that the energy efficiency is decreased.

The present invention has been made in view of such problems, and an object of the present invention is to provide a capacity control valve capable of improving responsiveness.

In order to solve the above problems, a capacity control valve according to the present invention includes: a valve housing provided with a suction port through which a suction fluid of a suction pressure passes and a control port through which a control fluid of a control pressure passes; a valve
body to be driven by a solenoid; a spring that biases the valve body in a direction opposite to a direction of driving by the solenoid; and a CS valve that includes a CS valve seat and the valve body, and that moves the valve body to open and close a communication between the control port and the suction port, the capacity control valve opening and closing the CS valve to control the control pressure, in which the control fluid of the control pressure is suppliable to a back side of the valve body, and the capacity control valve further includes a flow passage control device that uses a fluid pressure generated by opening and closing of the CS valve and a pressure on the back side of the valve body to decrease the pressure on the back side of the valve body. According to the aforesaid feature of the present invention, when the pressure of the fluid on the back side of the valve body is increased, the flow passage control device uses a pressure difference between the fluid pressure generated by opening and closing of the CS valve, and the pressure on the back side of the valve body to discharge the fluid on the back side of the valve body through a flow passage, so that the pressure on the back side of the valve body can be decreased to reduce an influence of the control pressure which is applied to the valve body. Therefore, the responsiveness of the capacity control valve can be improved.

According to the present invention the flow passage control device includes an actuating
valve body and a biasing device, and the flow passage control device is a valve in which a force due to the fluid pressure and a biasing force of the biasing device are opposed to a force due to the pressure on the back side of the valve body. According to this configuration, since the actuating valve body biased by the biasing device can be operated according to the pressure difference between the fluid pressure generated because of a decrease in the control pressure by opening of the CS valve, and the pressure on the back side of the valve body, the flow passage control device for decreasing the pressure on the back side of the valve body can be simply configured.

It may be preferable that the fluid pressure is a pressure on a downstream side of the CS valve, and the biasing device biases the actuating valve body in a valve opening direction. According to this preferable configuration, since a flow of the control fluid of the control pressure from an upstream side to the downstream side of the CS valve is generated by opening of the CS valve to increase the pressure on the downstream side of the CS valve, the flow passage control device can be configured to open the flow passage that discharges the fluid on the back side of the valve body when the sum of the force due to the fluid pressure and the biasing force of the biasing device is larger than the force due to the pressure on the back side of the valve body, and the pressure on the back side of the valve body can be rapidly decreased to further improve responsiveness of the capacity control valve. Incidentally, the upstream side and the downstream side of the CS valve are a control port side and a suction port side of the CS valve, respectively, and the same applies to the following description.

It may be preferable that the fluid pressure is a pressure on an upstream side of the CS valve, and the biasing device biases the actuating valve body in a valve closing direction. According to this preferable configuration, since a flow of the control fluid of the control pressure from the upstream side to the downstream side of the CS valve is generated by opening of the CS valve to decrease the pressure on the upstream side of the CS valve, the flow passage control device can be configured to open the flow passage that discharges the fluid on the back side of the valve body when the sum of the force due to the fluid pressure and the biasing force of the biasing device is smaller than the force due to the pressure on the back side of the valve body, and a state where a pressure difference between the pressure on the back side of the valve body and the pressure on the upstream side of the CS valve is small is maintained. Therefore, the controllability of the capacity control valve can be improved.

It may be preferable that the capacity control valve further includes a pressure-actuated valve to be actuated to open and close a communication between an upstream side of the CS valve and the back side of the valve body by a pressure difference. According to this preferable configuration, when the control pressure on the upstream side of the CS valve is increased, the pressure-actuated valve is opened, the upstream side of the CS valve and the back side of the valve body communicate with each other, and the control fluid of the control pressure is supplied to the back side of the valve body, so that the pressure on the back side of the valve body is increased to reduce an influence of the control pressure applied to the valve body. Therefore, the responsiveness of the capacity control valve can be improved. In addition, when the control pressure is decreased, the pressure-actuated valve is closed, and the supply of the control fluid of the control pressure to the back side of the valve body is cut off. Therefore, when the flow passage that discharges the fluid on the back side of the valve body is opened by the flow passage control device, the pressure on the back side of the valve body can be efficiently decreased, so that the responsiveness of the capacity control valve can be further improved.

It may be preferable that the flow passage control device is provided in a through-hole of the valve housing, the through-hole communicating with the suction port. According to this preferable configuration, since the flow passage control device can be formed using the through-hole of the valve housing, the through-hole communicating with the existing suction port, the structure of the capacity control valve can be simplified.

It may be preferable that the flow passage control device is provided in a through-hole of the valve housing, the through-hole communicating with the upstream side of the CS valve. According to this preferable configuration, since the flow passage control device can be formed using the through-hole of the valve housing, the structure of the capacity control valve can be simplified.

Modes for implementing a capacity control valve according to the present invention will be described below based on embodiments.

A capacity control valve according to a first embodiment of the present invention will be described with reference to <FIG>. In the following description, right and left sides of <FIG> as viewed from a front side are right and left sides of the capacity control valve. In detail, a description will be given based on the assumption that the left side of the drawing sheet on which a valve housing <NUM> is disposed is the left side of the capacity control valve and the right side of the drawing sheet on which a solenoid <NUM> is disposed is the right side of the capacity control valve.

A capacity control valve V of the present invention is assembled into a variable displacement compressor M used for an air conditioning system of an automobile, etc., and by variably controlling the pressure of a working fluid (hereinafter, simply referred to as a "fluid") which is a refrigerant, controls a discharge amount of the variable displacement compressor M to adjust the air conditioning system to a target cooling capacity.

First, the variable displacement compressor M will be described. As shown in <FIG>, the variable displacement compressor M includes a casing <NUM> including a discharge chamber <NUM>, a suction chamber <NUM>, a control chamber <NUM>, and a plurality of cylinders 4a. Incidentally, the variable displacement compressor M is provided with a communication passage through which the discharge chamber <NUM> and the control chamber <NUM> directly communicate with each other, and the communication passage is provided with a fixed orifice <NUM> that adjusts and balances the pressures of the discharge chamber <NUM> and the control chamber <NUM> (see <FIG>).

In addition, the variable displacement compressor M includes a rotating shaft <NUM> to be driven and rotated by an engine (not shown) installed outside the casing <NUM>; a swash plate <NUM> coupled to the rotating shaft <NUM> so as to be tiltable by a hinge mechanism <NUM> in the control chamber <NUM>; and a plurality of pistons <NUM> coupled to the swash plate <NUM> and reciprocatably fitted in the respective cylinders 4a. The tilt angle of the swash plate <NUM> is continuously changed by appropriately controlling pressure in the control chamber <NUM> while utilizing a suction pressure Ps of the suction chamber <NUM> that suctions the fluid, a discharge pressure Pd of the discharge chamber <NUM> that discharges the fluid pressurized by the pistons <NUM>, and a control pressure Pc of the control chamber <NUM> that houses the swash plate <NUM>, by means of the capacity control valve V to be driven to open and close by electromagnetic force. Thereby, the stroke amount of the pistons <NUM> is changed to control the discharge amount of the fluid. Incidentally, for convenience of description, the capacity control valve V assembled into the variable displacement compressor M is not shown in <FIG>.

Specifically, the higher the control pressure Pc in the control chamber <NUM> is, the smaller the tilt angle of the swash plate <NUM> with respect to the rotating shaft <NUM> is, and thus the stroke amount of the pistons <NUM> is reduced. When the control pressure Pc reaches a certain pressure or higher, the swash plate <NUM> is substantially perpendicular to the rotating shaft <NUM>, namely, is slightly tilted from perpendicularity. In this case, since the stroke amount of the pistons <NUM> is minimized and the pressurization of the fluid in the cylinders 4a by the pistons <NUM> is minimized, the discharge amount of the fluid to the discharge chamber <NUM> is reduced, and the cooling capacity of the air conditioning system is minimized. On the other hand, the lower the control pressure Pc in the control chamber <NUM> is, the larger the tilt angle of the swash plate <NUM> with respect to the rotating shaft <NUM> is, and thus the stroke amount of the pistons <NUM> is increased. When the control pressure Pc reaches a certain pressure or lower, the swash plate <NUM> forms a maximum tilt angle with respect to the rotating shaft <NUM>. In this case, since the stroke amount of the pistons <NUM> is maximized and the pressurization of the fluid in the cylinders 4a by the pistons <NUM> is maximized, the discharge amount of the fluid to the discharge chamber <NUM> is increased, and the cooling capacity of the air conditioning system is maximized.

As shown in <FIG>, the capacity control valve V assembled into the variable displacement compressor M adjusts electric current which energizes a coil <NUM> forming the solenoid <NUM>, and controls the opening and closing of a CS valve <NUM> in the capacity control valve V, to control the fluid flowing out from the control chamber <NUM> to the suction chamber <NUM>, and thereby the control pressure Pc in the control chamber <NUM> is variably controlled. Incidentally, a discharge fluid of the discharge pressure Pd of the discharge chamber <NUM> is always supplied to the control chamber <NUM> via the fixed orifice <NUM>, and the CS valve <NUM> in the capacity control valve V is closed to increase the control pressure Pc in the control chamber <NUM>.

In the present embodiment, the CS valve <NUM> includes a CS valve body <NUM> as a valve body, and a CS valve seat 10a formed in an inner peripheral surface of the valve housing <NUM>. An axially left end 52a of a large-diameter portion <NUM> of the CS valve body <NUM> comes into contact with and separates from the CS valve seat 10a to open and close the CS valve <NUM>.

Next, a structure of the capacity control valve V will be described. As shown in <FIG>, the capacity control valve V mainly includes the valve housing <NUM> made of a metallic material or a resin material; the CS valve body <NUM> of which an axially left end portion is disposed inside the valve housing <NUM>; and the solenoid <NUM> connected to the valve housing <NUM> to exert a driving force on the CS valve body <NUM>.

As shown in <FIG>, the CS valve body <NUM> includes the large-diameter portion <NUM> that is a columnar body having a constant cross section, and a small-diameter portion <NUM> having a smaller diameter than that of the large-diameter portion <NUM> and extending rightward in an axial direction, and also serves as a rod that is disposed through the coil <NUM> of the solenoid <NUM>.

As shown in <FIG>, the solenoid <NUM> mainly includes a casing <NUM> including an opening portion 81a that is open leftward in the axial direction; a center post <NUM> that has a substantially cylindrical shape, and that is inserted into the opening portion 81a of the casing <NUM> from the left in the axial direction to be disposed between a radially inner side of the casing <NUM> and a radially inner side of the valve housing <NUM>; the CS valve body <NUM> which is inserted into the center post <NUM> to be reciprocatable in the axial direction, and of which the axially left end portion is disposed inside the valve housing <NUM>; a movable iron core <NUM> to which an axially right end portion of the CS valve body <NUM> is inserted and fixed; a coil spring <NUM> as a spring provided between the center post <NUM> and the movable iron core <NUM> to bias the movable iron core <NUM> rightward in the axial direction, which is a valve opening direction of the CS valve <NUM>; and the coil <NUM> for excitation wound on an outer side of the center post <NUM> with a bobbin interposed therebetween.

The center post <NUM> is made of a rigid body that is a magnetic material such as iron or silicon steel, and includes a cylindrical portion 82b provided with an insertion hole 82c into which the CS valve body <NUM> extending in the axial direction is inserted, and a flange portion 82d having an annular shape and extending from an outer peripheral surface of an axially left end portion of the cylindrical portion 82b in a radially outward direction.

As shown in <FIG> and <FIG>, a Ps port <NUM> is formed in the valve housing <NUM>, as a suction port that penetrates through the valve housing <NUM> in the radial direction to communicate with the suction chamber <NUM> of the variable displacement compressor M. In addition, a Pc port <NUM> is formed on a radially inner side of an axially left end of the valve housing <NUM>, as a control port that communicates with the control chamber <NUM> of the variable displacement compressor M.

A valve chamber <NUM> is formed inside the valve housing <NUM>, and the axially left end 52a of the large-diameter portion <NUM> of the CS valve body <NUM> is disposed in the valve chamber <NUM> so as to be reciprocatable in the axial direction. In addition, the Ps port <NUM> extends from an outer peripheral surface of the valve housing <NUM> in a radially inward direction to communicate with the valve chamber <NUM>. In addition, the Pc port <NUM> extends rightward from the radially inner side of the axially left end of the valve housing <NUM> in the axial direction to communicate with the valve chamber <NUM>.

The CS valve seat 10a is formed in the inner peripheral surface of the valve housing <NUM> at an opening end edge on a valve chamber <NUM> side of the Pc port <NUM>. In addition, the CS valve seat 10a, and a guide hole 10b against which an outer peripheral surface of the CS valve body <NUM> is slidable on a solenoid <NUM> side of the valve chamber <NUM> are formed in the inner peripheral surface of the valve housing <NUM>. Namely, the CS valve seat 10a and the guide hole 10b are integrally formed in the inner peripheral surface of the valve housing <NUM>. Incidentally, an inner peripheral surface of the guide hole 10b and the outer peripheral surface of the CS valve body <NUM> are slightly separated from each other in a radial direction to form a very small gap therebetween. The CS valve body <NUM> is smoothly movable relative to the valve housing <NUM> in the axial direction.

In addition, a recessed portion 10c recessed leftward in the axial direction is formed on an axially right side of the valve housing <NUM>, and the flange portion 82d of the center post <NUM> is inserted and fixed to the recessed portion 10c from the right in the axial direction in a substantially sealed manner, and the casing <NUM> is inserted and fixed to the valve housing <NUM> from the right in the axial direction in a substantially sealed manner, so that the valve housing <NUM>, the center post <NUM>, and the casing <NUM> are integrally connected to each other. Incidentally, an opening end on the solenoid <NUM> side of the guide hole 10b is formed on a radially inner side of a bottom surface of the recessed portion 10c of the valve housing <NUM>. In such a manner, in a state where the valve housing <NUM>, the center post <NUM>, and the casing <NUM> are integrally connected to each other, an axially right end surface of the valve housing <NUM> and an axially right side surface of the flange portion 82d of the center post <NUM> abut against a bottom surface of a recessed portion 81b formed on an axially left side of the casing <NUM>, and the bottom surface of the recessed portion 10c of the valve housing <NUM> and an axially left end surface of the center post <NUM> are separated from each other in the axial direction to form a gap therebetween.

In addition, a through-hole <NUM> extending in the axial direction between an axially left end surface of the valve housing <NUM> and a bottom portion of the recessed portion 10c is formed in the valve housing <NUM>. The through-hole <NUM> includes a small-diameter hole portion <NUM> of which an axially left end communicates with the control chamber <NUM> of the variable displacement compressor M, and a large-diameter hole portion <NUM> extending continuously from an axially right end of the small-diameter hole portion <NUM> and having a larger diameter than that of the small-diameter hole portion <NUM>. An axially right end of the large-diameter hole portion <NUM> is open to the gap formed between the bottom surface of the recessed portion 10c and the axially left end surface of the center post <NUM>. Incidentally, the control fluid of the control pressure Pc is supplied into the Pc port <NUM> and the small-diameter hole portion <NUM> of the through-hole <NUM> from the control chamber <NUM> of the variable displacement compressor M.

An actuating valve body <NUM> having a ball shape, and a return spring <NUM> of which an axially right end is fixed to the axially left end surface of the center post <NUM> and of which an axially left end abuts against the actuating valve body <NUM> from the right in the axial direction are disposed in the large-diameter hole portion <NUM> of the through-hole <NUM>. The actuating valve body <NUM> is biased leftward in the axial direction by the return spring <NUM>. The actuating valve body <NUM> and the return spring <NUM> form a first pressure-actuated valve <NUM> as a pressure-actuated valve that controls a communication between the control chamber <NUM> of the variable displacement compressor M and an internal space S of the casing <NUM> in the through-hole <NUM> that is a flow passage. Incidentally, the internal space S of the casing <NUM> communicates with an internal space of the center post <NUM> and the gap formed between the bottom surface of the recessed portion 10c of the valve housing <NUM> and the axially left end surface of the center post <NUM>.

In addition, a through-hole <NUM> extending in the axial direction between an inner peripheral surface of the Ps port <NUM> that is a through-hole extending in the radial direction, and the bottom portion of the recessed portion 10c at the axially right end is formed in the valve housing <NUM>. The through-hole <NUM> includes a small-diameter hole portion <NUM> of which an axially left end communicates with the inside of the Ps port <NUM>, and a large-diameter hole portion <NUM> extending continuously from an axially right end of the small-diameter hole portion <NUM> and having a larger diameter than that of the small-diameter hole portion <NUM>. An axially right end of the large-diameter hole portion <NUM> is open to the gap formed between the bottom surface of the recessed portion 10c of the valve housing <NUM> and an axially left end of the center post <NUM>. Incidentally, the pressure in the valve chamber <NUM>, inside the Ps port <NUM>, and inside the small-diameter hole portion <NUM> in the valve housing <NUM> is a fluid pressure that is generated on a downstream side of the CS valve <NUM> by opening and closing of the CS valve <NUM>.

An actuating valve body <NUM> having a ball shape and a return spring <NUM> as a biasing device of which an axially left end is fixed inside the small-diameter hole portion <NUM> and of which an axially right end abuts against the actuating valve body <NUM> from the left in the axial direction are disposed in the large-diameter hole portion <NUM> and the small-diameter hole portion <NUM> of the through-hole <NUM>. The actuating valve body <NUM> is biased rightward in the axial direction. The actuating valve body <NUM> and the return spring <NUM> form a second pressure-actuated valve <NUM> as a flow passage control device for controlling a communication between the Ps port <NUM> and the internal space S of the casing <NUM> in the through-hole <NUM> that is a flow passage.

Incidentally, the internal space S of the casing <NUM> always communicates with the Ps port <NUM> via a throttle. Specifically, the very small gap between the inner peripheral surface of the guide hole 10b and the outer peripheral surface of the CS valve body <NUM> functions as a throttle. The fluid in the internal space S of the casing <NUM> can be gently released to the Ps port <NUM>, and a state where a pressure difference between the pressure of the fluid in the valve chamber <NUM> and the pressure of the fluid in the internal space S of the casing <NUM> is small is maintained during non-use for a long time.

Next, an operation of the capacity control valve V, mainly, an opening and closing operation of the CS valve <NUM> will be described.

First, a non-energized state of the capacity control valve V will be described. As shown in <FIG> and <FIG>, when the capacity control valve V is in the non-energized state, the movable iron core <NUM> is pressed rightward in the axial direction by a biasing force of the coil spring <NUM>, so that the CS valve body <NUM> moves rightward in the axial direction, and the axially left end 52a of the large-diameter portion <NUM> of the CS valve body <NUM> separates from the CS valve seat 10a to open the CS valve <NUM>.

At this time, the biasing force Fsp1 of the coil spring <NUM>, and a force FP1 due to the pressure of the fluid on an axially left end surface of the CS valve body <NUM> are applied rightward to the CS valve body <NUM> in the axial direction, and a force FP2 due to the pressure of the fluid on an axially right end surface of the CS valve body <NUM> is applied leftward in the axial direction. Namely, a force Frod = Fsp1 + FP1 - FP2 is applied to the CS valve body <NUM>, given that a right direction is positive. Incidentally, when the CS valve <NUM> is opened, the force FP1 due to the pressure of the fluid on the axially left end surface of the CS valve body <NUM> is a force due to the pressure of the fluid in the valve chamber <NUM>, which is applied to the axially left end 52a of the large-diameter portion <NUM> of the CS valve body <NUM>. On the other hand, the force FP2 due to the pressure of the fluid on the axially right end surface of the CS valve body <NUM> is a force due to the pressure of the fluid that has flowed around from the valve chamber <NUM> to a back side of the CS valve body <NUM> through the gap between the inner peripheral surface of the guide hole 10b of the valve housing <NUM> and the outer peripheral surface of the CS valve body <NUM>, namely, the pressure of the fluid existing in the internal space S of the casing <NUM>. The force FP1 due to the pressure of the fluid on the axially left end surface of the CS valve body <NUM> is relatively higher than the force FP2 due to the pressure of the fluid on the axially right end surface of the CS valve body <NUM> (i.e., FP1 > FP2).

Next, an energized state of the capacity control valve V will be described with reference to <FIG>. As shown in <FIG>, when the capacity control valve V is in the energized state, namely, in normal control, in other words, in duty control, if an electromagnetic force Fsol generated by the application of an electric current to the solenoid <NUM> is larger than the force Frod (i.e., Fsol > Frod), the movable iron core <NUM> is pulled toward a center post <NUM> side, namely, to the axially left side, and the CS valve body <NUM> fixed to the movable iron core <NUM> moves together leftward in the axial direction, so that the axially left end 52a of the CS valve body <NUM> is seated on the CS valve seat 10a of the valve housing <NUM> to close the CS valve <NUM>.

At this time, the electromagnetic force Fsol to the left in the axial direction and the force Frod to the right in the axial direction are applied to the CS valve body <NUM> (namely, a force Frod - Fsol is applied to the CS valve body <NUM>, given that the right direction is positive). Incidentally, when the CS valve <NUM> is closed, the force FP1 due to the pressure of the fluid on the axially left end surface of the CS valve body <NUM> is a force due to the control pressure Pc of the control fluid inside the Pc port <NUM>.

Next, when the control pressure Pc is high or when the control pressure Pc is desired to be rapidly increased, a transition from a fully open state of the CS valve <NUM>, namely, the non-energized state of the capacity control valve V to a fully closed state of the CS valve <NUM>, namely, a maximum energized state of the capacity control valve V will be described. In the fully open state of the CS valve <NUM> shown in <FIG>, when the control pressure Pc is high, a pressure difference between the control pressure Pc of the control fluid inside the Pc port <NUM>, the pressure of the fluid in the valve chamber <NUM> and the pressure of the fluid in the internal space S of the casing <NUM> is increased, and the force FP1 due to the control pressure Pc of the control fluid inside the Pc port <NUM> is greatly applied to the CS valve body <NUM> to bias the CS valve body <NUM> rightward in the axial direction, namely, in the valve opening direction, so that a large application electric current is required to move the CS valve body <NUM> leftward in the axial direction. In addition, also when the control pressure Pc is desired to be rapidly increased, a large application electric current is required to move the CS valve body <NUM> leftward in the axial direction.

As shown in <FIG>, when the control pressure Pc is high, the actuating valve body <NUM> of the first pressure-actuated valve <NUM> moves rightward in the axial direction against a biasing force of the return spring <NUM> and the pressure of the fluid in the internal space S of the casing <NUM> to separate from a tapered valve seat <NUM> formed in a connecting portion between the axially right end of the small-diameter hole portion <NUM> and the axially left end of the large-diameter hole portion <NUM> of the through-hole <NUM>, so that the first pressure-actuated valve <NUM> is opened. At this time, a force FP11 due to the control pressure Pc inside the small-diameter hole portion <NUM> which is larger than the biasing force Fsp11 of the return spring <NUM> and a force FP12 due to the pressure of the fluid in the internal space S of the casing <NUM> is applied rightward to the actuating valve body <NUM> in the axial direction (i.e., FP11 > Fsp11 + FP12, and shown by a white arrow in <FIG>).

Accordingly, the control chamber <NUM> of the variable displacement compressor M and the internal space S of the casing <NUM> communicate with each other through the through-hole <NUM>, the control fluid of the control pressure Pc is supplied from the control chamber <NUM> of the variable displacement compressor M to the internal space S of the casing <NUM> through the through-hole <NUM>, and the pressure difference between the control pressure Pc of the control chamber <NUM> of the variable displacement compressor M and the pressure of the fluid in the internal space S of the casing <NUM> is reduced. Hence, an influence of the force FP1 due to the control pressure Pc of the control fluid inside the Pc port <NUM> which is applied to the CS valve body <NUM> is reduced, so that the CS valve body <NUM> can be smoothly operated leftward in the axial direction, namely, in a valve closing direction, and responsiveness to control of the variable displacement compressor M at high output can be improved.

In addition, since a pressure difference between the pressure of the fluid inside the small-diameter hole portion <NUM> of the through-hole <NUM> communicating with the Ps port <NUM> on the downstream side of the CS valve <NUM>, and the pressure of the fluid in the internal space S of the casing <NUM> increases because of the supply of the control fluid of the control pressure Pc to the internal space S of the casing <NUM>, the actuating valve body <NUM> of the second pressure-actuated valve <NUM> moves leftward in the axial direction against a biasing force of the return spring <NUM> and the pressure of the fluid inside the small-diameter hole portion <NUM> to be seated on a tapered valve seat <NUM> formed in a connecting portion between the axially right end of the small-diameter hole portion <NUM> and the axially left end of the large-diameter hole portion <NUM> of the through-hole <NUM>, so that the second pressure-actuated valve <NUM> is closed in a substantially sealed manner. At this time, a force FP22 due to the pressure of the fluid in the internal space S of the casing <NUM> which is larger than a combined force of the biasing force Fsp21 of the return spring <NUM> and a force FP21 due to the pressure of the fluid inside the small-diameter hole portion <NUM> is applied leftward to the actuating valve body <NUM> in the axial direction (i.e., Fsp21 + FP21 < FP22, and shown by a white arrow in <FIG>).

Accordingly, the Ps port <NUM> and the internal space S of the casing <NUM> enter a non-communication state, and the fluid supplied from the control chamber <NUM> of the variable displacement compressor M to the internal space S of the casing <NUM> through the through-hole <NUM> is not discharged to the Ps port <NUM> through the through-hole <NUM>. Hence, the pressure of the fluid in the internal space S of the casing <NUM> can be efficiently increased.

Here, as shown in <FIG>, when the capacity control valve V switches from a state where because of an increase in the control pressure Pc, the first pressure-actuated valve <NUM> is opened to reduce the pressure difference between the control pressure Pc and the pressure of the fluid in the internal space S of the casing <NUM>, to the non-energized state to open the CS valve <NUM> (see <FIG>), the Pc port <NUM> and the Ps port <NUM> communicate with each other, the control fluid of the control pressure Pc is discharged from the control chamber <NUM> of the variable displacement compressor M to the suction chamber <NUM>, and the control pressure Pc decreases.

As shown in <FIG>, when the capacity control valve V switches from the energized state to the non-energized state to open the CS valve <NUM>, the control pressure Pc of the Pc port <NUM> decreases. At this time, since the first pressure-actuated valve <NUM> is in a valve open state, when the pressure of the fluid in the internal space S of the casing <NUM> decreases to a pressure close to the control pressure Pc of the Pc port <NUM>, and the biasing force of the return spring <NUM> is larger than a force due to a differential pressure applied to the actuating valve body <NUM>, the first pressure-actuated valve <NUM> is closed. In addition, since a part of the fluid to be discharged from the Pc port <NUM> to the Ps port <NUM> through the valve chamber <NUM> flows into the small-diameter hole portion <NUM> of the through-hole <NUM>, and the pressure inside the small-diameter hole portion <NUM> rises higher than pressure immediately before opening (see a solid line arrow in <FIG>), the second pressure-actuated valve <NUM> is opened, and the internal space S of the casing <NUM> communicates with the Ps port <NUM>. Therefore, when the pressure of the fluid in the internal space S of the casing <NUM> decreases to a pressure close to the suction pressure Ps of the Ps port <NUM>, and the biasing force of the return spring <NUM> is larger than a force due to a differential pressure applied to the actuating valve body <NUM>, the second pressure-actuated valve <NUM> maintains a valve open state. At this time, the combined force of the biasing force Fsp21 of the return spring <NUM> and the force FP21 due to the pressure on the downstream side of the CS valve <NUM>, namely, the pressure of the fluid inside the small-diameter hole portion <NUM>, which is larger than the force FP22 due to the pressure of the fluid in the internal space S of the casing <NUM>, is applied rightward to the actuating valve body <NUM> in the axial direction (i.e., Fsp21 + FP21 > FP22, and shown by a white arrow in <FIG>).

Accordingly, the internal space S of the casing <NUM> and the Ps port <NUM> communicate with each other through the through-hole <NUM>, the fluid in the internal space S of the casing <NUM> is discharged from the internal space S of the casing <NUM> to the Ps port <NUM> through the through-hole <NUM>, and the pressure of the fluid in the internal space S of the casing <NUM> decreases rapidly. Hence, the pressure difference between the control pressure Pc of the control fluid inside the Pc port <NUM> and the pressure of the fluid in the internal space S of the casing <NUM> is reduced. Therefore, an influence of the force FP2 due to the pressure of the fluid in the internal space S of the casing <NUM> which is applied to the CS valve body <NUM> is reduced, so that the CS valve body <NUM> can be smoothly operated rightward in the axial direction, namely, in the valve opening direction, and responsiveness when the CS valve <NUM> starts opening from a valve closed state can be improved. Incidentally, in <FIG>, a pressure distribution immediately after transition from the energized state to the non-energized state is shown by dots, and it goes without saying that the pressure inside the capacity control valve V becomes uniform over time.

In addition, since the CS valve <NUM> is opened, and the control pressure Pc decreases, the biasing force is applied leftward to the actuating valve body <NUM> of the first pressure-actuated valve <NUM> in the axial direction, namely, in the valve closing direction by the return spring <NUM>, and the actuating valve body <NUM> is seated on the valve seat <NUM>, so that the first pressure-actuated valve <NUM> is closed in a substantially sealed manner. At this time, a combined force of the biasing force Fsp11 of the return spring <NUM> and the force FP12 due to the pressure of the fluid in the internal space S of the casing <NUM>, which is larger than the force FP11 due to the control pressure Pc inside the small-diameter hole portion <NUM>, is applied leftward to the actuating valve body <NUM> in the axial direction (i.e., FP11 < Fsp11 + FP12, and shown by a white arrow in <FIG>).

Accordingly, the control chamber <NUM> of the variable displacement compressor M and the internal space S of the casing <NUM> enter a non-communication state, and the supply of the control fluid of the control pressure Pc to the internal space S of the casing <NUM> is cut off. Hence, the pressure of the fluid in the internal space S of the casing <NUM> can be decreased more rapidly because of opening of the second pressure-actuated valve <NUM> described above, and responsiveness to control for the CS valve <NUM> to start opening from a valve closed state can be further improved.

In addition, the flow passage control device of the present embodiment is formed of the second pressure-actuated valve <NUM> in which a force due to the fluid pressure on the downstream side of the CS valve <NUM>, namely, the force FP21 due to the pressure of the fluid inside the small-diameter hole portion <NUM> of the through-hole <NUM> communicating with the Ps port <NUM>, and the biasing force Fsp21 of the return spring <NUM> are opposed to the force FP22 due to the pressure of the fluid in the internal space S of the casing <NUM>. Since the biasing force of the return spring <NUM> is used for an opening and closing operation of the second pressure-actuated valve <NUM>, a flow passage can be reliably opened and closed which discharges the pressure of the fluid in the internal space S of the casing <NUM> according to a pressure difference between the fluid pressure on the downstream side of the CS valve <NUM> generated by opening and closing of the CS valve <NUM>, and the pressure of the fluid in the internal space S of the casing <NUM>, and the reliability of the opening and closing operation of the second pressure-actuated valve <NUM> is high.

In addition, since the second pressure-actuated valve <NUM> is capable of operating the actuating valve body <NUM> biased by the return spring <NUM> according to the pressure difference between the fluid pressure generated because of a decrease in the control pressure Pc by opening of the CS valve <NUM>, and the pressure of the fluid in the internal space S of the casing <NUM>, the flow passage control device for decreasing the pressure of the fluid in the internal space S of the casing <NUM> can be simply configured.

In addition, since the second pressure-actuated valve <NUM> is provided in the through-hole <NUM> of the valve housing <NUM> which communicates with the Ps port <NUM>, and the flow passage control device can be formed using the through-hole <NUM> communicating with the existing Ps port <NUM>, the structure of the capacity control valve V can be simplified.

In addition, since the CS valve seat 10a and the guide hole 10b are integrally formed in the valve housing <NUM>, the accuracy of operation of the CS valve body <NUM> can be improved.

A capacity control valve according to a second embodiment of the present invention will be described with reference to <FIG>. Incidentally, a description of the same and duplicated configurations as the configurations of the first embodiment will be omitted.

As shown in <FIG>, in the present embodiment, a through-hole <NUM> extending in the axial direction between an axially left end surface and the bottom portion of the recessed portion 10c is formed in the valve housing <NUM>. The through-hole <NUM> includes a large-diameter hole portion <NUM> of which an axially left end communicates with the control chamber <NUM> of the variable displacement compressor M, and a small-diameter hole portion <NUM> extending continuously from an axially right end of the large-diameter hole portion <NUM> and having a smaller diameter than that of the large-diameter hole portion <NUM>. Incidentally, the pressure inside the Pc port <NUM>, inside the small-diameter hole portion <NUM> of the through-hole <NUM>, and inside the large-diameter hole portion <NUM> of the through-hole <NUM> in the valve housing <NUM> is a fluid pressure on an upstream side of the CS valve <NUM>, namely, the control pressure Pc of the control fluid to be supplied from the control chamber <NUM> of the variable displacement compressor M.

An actuating valve body <NUM> having a ball shape, and a return spring <NUM> as a biasing device of which an axially left end is fixed to an axially right end of a fixed ring <NUM> inserted and fixed to an axially left opening end portion of the large-diameter hole portion <NUM> and of which an axially right end abuts against the actuating valve body <NUM> from the left in the axial direction are disposed in the large-diameter hole portion <NUM> of the through-hole <NUM>. The actuating valve body <NUM> is biased rightward in the axial direction by the return spring <NUM>. The actuating valve body <NUM> and the return spring <NUM> form a second pressure-actuated valve <NUM> as a flow passage control device for controlling a communication between the upstream side of the CS valve <NUM> and the internal space S of the casing <NUM>.

As shown in <FIG>, when the control pressure Pc is low, and the pressure difference between the control pressure Pc and the pressure of the fluid in the internal space S of the casing <NUM> is small, the actuating valve body <NUM> of the first pressure-actuated valve <NUM> is moved leftward in the axial direction by the biasing force of the return spring <NUM> and the pressure of the fluid in the internal space S of the casing <NUM> to be seated on the valve seat <NUM>, so that the first pressure-actuated valve <NUM> is closed in a substantially sealed manner. At this time, a combined force of the biasing force Fsp11 of the return spring <NUM> and the force FP12 due to the pressure of the fluid in the internal space S of the casing <NUM>, which is larger than the force FP11 due to the control pressure Pc inside the small-diameter hole portion <NUM>, is applied leftward to the actuating valve body <NUM> in the axial direction (i.e., FP11 < Fsp11 + FP12, and shown by a white arrow in <FIG>).

In addition, the actuating valve body <NUM> of the second pressure-actuated valve <NUM> is moved rightward in the axial direction by a biasing force of the return spring <NUM> and the pressure of the fluid inside the large-diameter hole portion <NUM> of the through-hole <NUM> to be seated on a tapered valve seat <NUM> formed in a connecting portion between the axially right end of the large-diameter hole portion <NUM> and an axially left end of the small-diameter hole portion <NUM> of the through-hole <NUM>, so that the second pressure-actuated valve <NUM> is closed in a substantially sealed manner. At this time, a combined force of the biasing force Fsp31 of the return spring <NUM> and a force FP31 due to the pressure of the fluid inside the large-diameter hole portion <NUM>, which is larger than a force FP32 due to the pressure of the fluid in the internal space S of the casing <NUM>, is applied rightward to the actuating valve body <NUM> in the axial direction (i.e., Fsp31 + FP31 > FP32, and shown by a white arrow in <FIG>).

As shown in <FIG>, when the control pressure Pc is high, and the pressure difference between the control pressure Pc and the pressure of the fluid in the internal space S of the casing <NUM> is large, the actuating valve body <NUM> of the first pressure-actuated valve <NUM> moves rightward in the axial direction against the biasing force of the return spring <NUM> and the force due to the pressure of the fluid in the internal space S of the casing <NUM> to separate from the valve seat <NUM>, so that the first pressure-actuated valve <NUM> is opened. At this time, the force FP11 due to the control pressure Pc inside the small-diameter hole portion <NUM> which is larger than the combined force of the biasing force Fsp11 of the return spring <NUM> and the force FP12 due to the pressure of the fluid in the internal space S of the casing <NUM> is applied rightward to the actuating valve body <NUM> in the axial direction (i.e., FP11 > Fsp11 + FP12, and shown by a white arrow in <FIG>).

Accordingly, the control chamber <NUM> of the variable displacement compressor M and the internal space S of the casing <NUM> communicate with each other through the through-hole <NUM>, the control fluid of the control pressure Pc is supplied from the control chamber <NUM> of the variable displacement compressor M to the internal space S of the casing <NUM> through the through-hole <NUM>, and the pressure difference between the control pressure Pc of the control chamber <NUM> of the variable displacement compressor M and the pressure of the fluid in the internal space S of the casing <NUM> is reduced. Hence, an influence of the force 0FP1 due to the control pressure Pc of the control fluid inside the Pc port <NUM> which is applied to the CS valve body <NUM> is reduced, so that the CS valve body <NUM> can be smoothly operated leftward in the axial direction, namely, in a valve closing direction, and responsiveness to control of the variable displacement compressor M at high output can be improved.

In addition, since the pressure difference between the control pressure Pc of the control fluid inside the large-diameter hole portion <NUM> of the through-hole <NUM> and the pressure of the fluid in the internal space S of the casing <NUM> is reduced because of the supply of the control fluid of the control pressure Pc to the internal space S of the casing <NUM>, the actuating valve body <NUM> of the second pressure-actuated valve <NUM> is pressed against the valve seat <NUM> mainly by the biasing force of the return spring <NUM>, and a state where the second pressure-actuated valve <NUM> is closed in a substantially sealed manner is maintained.

Next, as shown in <FIG>, when the capacity control valve V switches from the energized state to the non-energized state to open the CS valve <NUM>, the control fluid is discharged from the Pc port <NUM> to the Ps port <NUM> through the valve chamber <NUM> (see a solid line arrow in <FIG>), so that the pressure of the fluid inside the large-diameter hole portion <NUM> of the through-hole <NUM> decreases, and a pressure difference between the pressure of the fluid inside the large-diameter hole portion <NUM> and the pressure of the fluid inside the small-diameter hole portion <NUM> of the through-hole <NUM>, namely, the pressure of the fluid in the internal space S of the casing <NUM> is increased. Therefore, the actuating valve body <NUM> of the second pressure-actuated valve <NUM> moves leftward in the axial direction against the biasing force of the return spring <NUM> and the force due to the pressure of the fluid inside the large-diameter hole portion <NUM> to separate from the valve seat <NUM>, so that the second pressure-actuated valve <NUM> is opened. At this time, the force FP32 due to the pressure of the fluid in the internal space S of the casing <NUM> which is larger than a combined force of the biasing force Fsp31 of the return spring <NUM> and the force FP31 due to the pressure of the fluid inside the large-diameter hole portion <NUM> is applied leftward to the actuating valve body <NUM> in the axial direction (i.e., FP31 + Fsp31 < FP32, and shown by a white arrow in <FIG>).

Accordingly, the internal space S of the casing <NUM> and the control chamber <NUM> of the variable displacement compressor M communicate with each other through the through-hole <NUM>, the fluid in the internal space S of the casing <NUM> is discharged from the internal space S of the casing <NUM> through the through-hole <NUM>, the Pc port <NUM>, and the Ps port <NUM>, and the pressure of the fluid in the internal space S of the casing <NUM> decreases rapidly. Hence, the pressure difference between the control pressure Pc of the control fluid inside the Pc port <NUM> and the pressure of the fluid in the internal space S of the casing <NUM> is reduced. Therefore, an influence of the force FP2 due to the pressure of the fluid in the internal space S of the casing <NUM> which is applied to the CS valve body <NUM> is reduced, so that the CS valve body <NUM> can be smoothly operated rightward in the axial direction, namely, in the valve opening direction, and responsiveness when the CS valve <NUM> starts opening from a valve closed state can be improved. Incidentally, in <FIG>, a pressure distribution immediately after transition from the energized state to the non-energized state is shown by dots, and it goes without saying that the pressure inside the capacity control valve V becomes uniform over time.

In addition, when the pressure of the fluid in the internal space S of the casing <NUM> decreases because of opening of the second pressure-actuated valve <NUM>, and the pressure difference between the pressure of the fluid inside the large-diameter hole portion <NUM> and the pressure of the fluid in the internal space S of the casing <NUM> is reduced, the second pressure-actuated valve <NUM> is closed, and the second pressure-actuated valve <NUM> is repeatedly opened and closed according to the pressure difference between the pressure of the fluid inside the large-diameter hole portion <NUM> and the pressure of the fluid in the internal space S of the casing <NUM>. Therefore, a state where the pressure difference between the pressure of the fluid inside the large-diameter hole portion <NUM>, namely, the control pressure Pc and the pressure of the fluid in the internal space S of the casing <NUM> is small can be maintained, and controllability of the capacity control valve V even during normal control can be improved.

In addition, since the CS valve <NUM> is opened, and the control pressure Pc decreases, the biasing force is applied leftward to the actuating valve body <NUM> of the first pressure-actuated valve <NUM> in the axial direction, namely, in the valve closing direction by the return spring <NUM>, and the actuating valve body <NUM> is seated on the valve seat <NUM>, so that the first pressure-actuated valve <NUM> is closed in a substantially sealed manner. Incidentally, since a state where the first pressure-actuated valve <NUM> is closed is maintained until the control pressure Pc increases, the pressure difference between the control pressure Pc and the pressure of the fluid in the internal space S of the casing <NUM> is easily adjusted by the opening and closing operation of the second pressure-actuated valve <NUM> described above.

In addition, the flow passage control device of the present embodiment is formed of the second pressure-actuated valve <NUM> in which a force due to the fluid pressure on the upstream side of the CS valve <NUM>, namely, the force FP31 due to the pressure of the fluid inside the large-diameter hole portion <NUM> and the biasing force Fsp21 of the return spring <NUM> are opposed to the force FP32 due to the pressure of the fluid in the internal space S of the casing <NUM>. Since the biasing force of the return spring <NUM> is used for the opening and closing operation of the second pressure-actuated valve <NUM>, a flow passage can be reliably opened and closed which discharges the pressure of the fluid in the internal space S of the casing <NUM> according to a pressure difference between the fluid pressure on the upstream side of the CS valve <NUM> generated by opening and closing of the CS valve <NUM>, namely, the control pressure Pc and the pressure of the fluid in the internal space S of the casing <NUM>, and the reliability of the opening and closing operation of the second pressure-actuated valve <NUM> is high.

In addition, since the second pressure-actuated valve <NUM> is provided in the through-hole <NUM> of the valve housing <NUM> which communicates with the control chamber <NUM> of the variable displacement compressor M, and the flow passage control device can be formed using the through-hole <NUM> formed in the existing valve housing <NUM>, the structure of the capacity control valve V can be simplified.

For example, in the first and second embodiments, the mode has been described in which the CS valve body is provided in a drive rod that is disposed through the coil <NUM> of the solenoid <NUM>; however, the present invention is not limited to the mode, and the CS valve body may be configured to be reciprocatable integrally with a separate rod in the axial direction.

In addition, in the first and second embodiments, the CS valve seat and the guide hole have been described as being integrally formed in the inner peripheral surface of the valve housing; however, the present invention is not limited thereto, and a valve housing including the CS valve seat and a valve housing including the guide hole may be provided separately.

In addition, a guide portion is not limited to being formed in the valve housing, and may be formed, for example, in a part of the insertion hole 82c of the center post <NUM>.

In addition, in the first and second embodiments, the CS valve body <NUM> has been described as being biased in the axial direction by the coil spring <NUM> forming the solenoid <NUM>; however, the present invention is not limited thereto, and an auxiliary spring that biases the CS valve body in the axial direction may be provided in the axially left end portion of the CS valve body, and the CS valve body may be biased in the axial direction by the coil spring <NUM> and the auxiliary spring on axially both sides of the CS valve body, so that an axial operation of the CS valve body is stabilized.

In addition, in the first and second embodiments, the flow passage control device has been described as being formed of a pressure-actuated valve; however, the present invention is not limited thereto, and the flow passage control device may adjust the opening degree of the throttle.

Claim 1:
A capacity control valve (V) comprising:
a valve housing (<NUM>) provided with a suction port (<NUM>) through which a suction fluid of a suction pressure (Ps) passes and a control port (<NUM>) through which a control fluid of a control pressure (Pc) passes;
a valve body (<NUM>) to be driven by a solenoid (<NUM>);
a spring (<NUM>) that biases the valve body (<NUM>) in a direction opposite to a direction of driving by the solenoid (<NUM>); and
a CS valve (<NUM>) that includes a CS valve seat (10a) and the valve body (<NUM>), and that moves the valve body (<NUM>) to open and close a communication between the control port (<NUM>) and the suction port (<NUM>), the capacity control valve (V) opening and closing the CS valve (<NUM>) to control the control pressure (Pc),
wherein the control fluid of the control pressure (Pc) is suppliable to a back side of the valve body (<NUM>),
the capacity control valve (V) further comprises a flow passage control device (<NUM>, <NUM>) that uses a fluid pressure generated by opening and closing of the CS valve (<NUM>) and a pressure on the back side of the valve body (<NUM>) to decrease the pressure on the back side of the valve body (<NUM>), characterized in that
the flow passage control device (<NUM>, <NUM>) includes an actuating valve body (<NUM>, <NUM>) and a biasing device (<NUM>, <NUM>), and
the flow passage control device (<NUM>, <NUM>) is a valve in which a force due to the fluid pressure and a biasing force of the biasing device (<NUM>, <NUM>) are opposed to a force due to the pressure on the back side of the valve body (<NUM>).