Abstract: In a control valve for a variable capacity compressor, coolant that is sucked in from a suction chamber through a suction conduit is compressed and delivered to a delivery chamber through a delivery conduit and the coolant pressure is controlled by an electromagnetic control valve. Opening/closing control of a gas supply valve body (gas supply side) that communicates with the delivery conduit and a crank chamber and of an extraction valve body (extraction side) that communicates with the crank chamber and the suction conduit is performed in accordance with the suction coolant pressure of the suction conduit. A crank chamber communication port communicates with the extraction valve chamber.

Abstract: A pneumatically-operated control valve selectively opens and closes a passage between discharge and crankcase chambers of a variable capacity refrigerant compressor for purposes of controlling the compressor capacity, and includes an integral pressure sensor for measuring the compressor discharge pressure. The valve includes a plunger having an axis, a stopper biased against a seat in the passage coupling the discharge and crankcase chambers, an annular bellows and a pressure sensor. A portion of the plunger passes through the annular bellows, and one end of the bellows is attached to the plunger for axially displacing the plunger to unseat the stopper. The stopper and plunger are maintained in engagement, and have axial bores that are aligned to form a passage between the compressor discharge chamber and a cavity in which the pressure sensor is retained.

Abstract: In a variable displacement hydraulic pump having a housing with a multiplicity of interconnected surfaces, including opposed end surfaces and intermediate side surfaces, the improvement comprising the location of at least one case drain orifice in each of a plurality of differing ones of the surfaces in a manner such that at least one of the orifices is located in the vicinity of the top surface of the housing in any spatial orientation of the housing.

Abstract: The object of the present invention is to provide a control valve for a variable displacement compressor, which is used for controlling differential pressure between discharge pressure and suction pressure such that the differential pressure becomes equal to differential pressure set by duty ratio control, and improved in characteristics thereof when it is in the vicinity of the valve-closing position. A valve section for controlling the flow rate of refrigerant at discharge pressure Pd to thereby supply refrigerant at pressure Pc to a crankcase is implemented by a spool valve structures. A spool valve element and a shaft arranged coaxially with each other are configured such that the spool valve element and the shaft oppositely receive the discharge pressure Pd and the suction pressure Ps, respectively. The differential pressure between, the discharge pressure Pd and suction pressure Ps, which is to be controlled, is set by a pulse current supplied to a solenoid section which is duty ratio controlled.

Abstract: There is disclosed a control valve device for a variable capacity type swash plate compressor for use in an air conditioning system. The device comprises an introducing passage for connecting a discharge chamber to a crank chamber in the compressor, and a control valve for adjusting a pressure in the crank chamber in an autonomous manner to control a discharge capacity of the compressor. The control valve includes a valve unit for opening/closing the introducing passage and an electromagnetic solenoid assembly for operating the valve unit. The control valve device further comprises a resistance variable mechanism for varying a resistance of the magnetic circuit in the assembly in accordance with a differential pressure of the refrigerant between two points defined between the compressor and a condenser of the system.

Abstract: A swash-plate compression device of the variable capacity type used in a refrigerating system of a vehicle comprises a swash-plate compressor and a control valve for autonomously adjusting the pressure in a crank chamber of the compressor. The control valve is opened and closed to introduce some of a refrigerant, which is discharged from the compressor, into the crank chamber. The opening of the control valve is controlled in accordance with a target differential pressure between the actual discharge pressure of the discharged refrigerant and the mean internal pressure of the entire compression chambers of the compressor or between the actual discharge pressure and the peak value of the internal pressure of the compression chamber so that the actual capacity of the compressor is feedback-controlled to be adjusted to a target capacity therefor.

Abstract: A control valve system of a variable displacement swash plate type compressor for use in a heating and cooling air conditioner, which includes a throttling valve provided in a refrigerating circuit, a constant differential pressure valve arranged to open when a differential pressure between upstream and downstream pressures of the throttling valve reaches a predetermined value, thereby introducing compressor discharge gas to a crank chamber, external information detecting device for detecting external information such as cooling load or vehicle running state, and controller for determining an opening of the throttling valve based on the external information, and which is capable of performing a stable feedback control of the discharge capacity in a range from a small discharge capacity to a large discharge capacity, and suppressing the decrease in compressor efficiency at large discharge capacity.

Abstract: A compressor includes a housing that has cylinder bores. A swash plate chamber communicates to the cylinder bores and a motor chamber partitioned from the swash plate chamber. A motor is disposed in the motor chamber actuates a drive mechanism in the swash plate chamber so as to move pistons in the cylinder bores. The refrigerant gas is supplied to an interior refrigerant passage of the compressor from an external refrigerant circuit. The swash plate chamber and the motor chamber are separated in the air tight manner. The motor chamber is connected to the interior refrigerant passage by a refrigerant path.

Abstract: A piston type compressor has introducing passages, each extending from one of compression chambers, and a cylindrical rotary valve located between a suction pressure zone and the introducing passages. An opening of each of the introducing passages has an advanced area a part of that is inclined relative to an axial direction and a circumferential direction of the rotary valve. The rotary valve has a residual gas bypass passage. The residual gas bypass passage connects a high pressure introducing passage through the introducing passages, which communicates with the high pressure compression chamber after the discharge stroke ends, to a low pressure introducing passage, which communicates with the low pressure compression chamber.

Abstract: In a piston type compressor, a housing includes a cylinder head which defines a discharge chamber and a cooling chamber. The cooling chamber located adjacent to the discharge chamber surrounds the discharge chamber. The housing also defines a suction chamber, a compression chamber, and a crank chamber. The cooling chamber is isolated from the suction chamber. Gas is introduced from outside of the housing into the suction chamber. A rotary shaft is rotatably supported in the housing. The cam is accommodated in the crank chamber. A piston is operatively coupled to the rotary shaft through the cam. Rotation of the rotary shaft is converted to reciprocation of the piston. A seal member shuts communication between the cooling chamber and an atmosphere outside the compressor to seal an inside of the cylinder head. An introducing passage interconnects the cooling chamber and the crank chamber.

Abstract: A piston type compressor having a drive plate (swash plate), wherein sliding friction between the drive plate and shoes is reduced and the compressor is made smaller by slidably attaching the shoes engaged with spherical ends of pistons to a shoe holding plate formed with guide grooves in the radial direction and supporting the shoe holding plate by the drive plate through a thrust bearing. The drive plate is connected to an arm of the shaft side through a double slide link mechanism to enable it to be supported by only a front end of the front housing.

Abstract: A variable displacement compressor has a drive shaft, a rotor supported by the drive shaft, a drive plate supported by the drive shaft and a hinge mechanism located between the rotor and the drive plate. The hinge mechanism includes a cam, which is located on the rotor, and a guide portion, which is located on the drive plate. The cam has a cam surface, which has a predetermined profile. One of the cam surface and the guide portion slides against the other in accordance with inclination of the drive plate. The guide portion traces a path corresponding to the profile of the cam surface with respect to the cam. The path includes a first path corresponding to a small displacement region of the compressor and a second path corresponding to a large displacement region of the compressor. The profile of the cam surface is determined such that the first path and the second path bulge in a direction opposite to each other to compensate for fluctuation of a top dead center position of the piston.

Abstract: An automotive air conditioning compressor with a capacity control valve improves oil retention in the crankcase with a crankcase to suction chamber passage that is formed through the central shaft. The passage inlet opening in the shaft is located within a central chamber inset into the cylinder block, and is thereby sheltered from the main chamber of the crankcase, although still open to the crankcase. So sheltering the inlet of the shaft passage between crankcase and suction chamber isolates the inlet from the greater turbulence and higher velocity gradients within main chamber of the crankcase. Less oil is thus forced through the passage and back out of the crankcase.

Abstract: A supply passage is formed in a rotary shaft along the axis thereof. An expansion passage is formed in the rotary shaft in such a way as to be led to the supply passage. A pair of fluid passages are formed in the rotary shaft in such a way as to communicate with the expansion passage. The fluid passages extend in a direction orthogonal to the axis and the outlet ports of the fluid passages are open to the outer surface of the rotary shaft. The fluid passages extend from the expansion passage to a control pressure chamber, penetrating through the rotary shaft.

Abstract: A control valve controls the displacement of a variable displacement compressor. The control valve includes a first valve body for adjusting the pressure in a crank chamber, a pressure sensing member, which is displaced in accordance with the pressure difference between two pressure points located in a refrigerant circuit to move the first valve body, an electromagnetic actuator for urging the pressure sensing member, and a second valve body, which is operably coupled to the pressure sensing member. The second valve body adjusts the opening degree of a discharge passage of the refrigerant circuit in accordance with the displacement of the pressure sensing member. Therefore, compared to a case where the first and second valve bodies are independently arranged in the compressor, the number of parts are reduced, which reduces the manufacturing cost.

Abstract: A control valve includes a separation portion, which is part of a rod, blocks a through hole that connects a valve chamber and a second chamber with each other. Therefore, the pressure of the second chamber is not directly affected by changes in the opening degree of the control valve. The second chamber and a valve hole forming a part of the through hole are both connected to a second pressure zone through an upstream section of a supply passage. This prevents creation of pressure difference between the valve hole and the second chamber, and thus prevents entry of foreign particles in sliding portions between the through hole and the rod.

Abstract: The present invention relates to a compressor that can reduce the refrigerant gas pulsation pressure in multi-step when a refrigerant gas is discharged into a rear refrigerant gas discharge chamber toward the outside of the compressor and into a front refrigerant gas discharge chamber toward the outside of the compressor, thereby obtaining excellent reduction in the refrigerant gas pulsation pressure and remarkably reducing a noise due to the refrigerant gas pulsation.

Abstract: A control valve for installation in a wobbleplate compressor with a changeable working volume is provided with an inlet for a connection to a pressure chamber, a first outlet for connection to a crank chamber, and a second outlet for connection to a suction chamber. A closing element cooperates with the second outlet and is acted upon by a device for controlling the gas mass flow.

Abstract: A capacity control valve that implements an accurate pressure control of a valve body by preventing unwanted pressures from influencing on the valve body and that alters the function of a control chamber such that the pressure within the control chamber to which a control pressure is supplied can quickly be modulated. In the capacity control valve, a valve opening joint portion which is integral with a valve body can rapidly be disengaged from an engagement portion which is integral with a pressure sensing device, hence a quick lifting of the valve body so as to modulate the capacity or pressure in the control chamber.

Abstract: The sensitivity of a pressure-sensitive element in a pressure-sensitive part of a control valve for variable-capacity compressor is made adjustable by means of an adjusting screw provided so as to permit an adjustment of forward and backward movement with respect to a frame supporting the pressure-sensitive part. The adjusting screw is rotated by engaging an engagement part, which is annexed to a coil assembly constituting a solenoid excitation part, against the adjusting screw thereby to operate the coil assembly.

Abstract: A method of adjusting a rotary machine includes the steps of press fitting an adjustable member to one of a housing and a rotary body where the adjustable member is arranged to a reference position at which movable amount or a rotary body is zero, and adjusting the movable amount of the rotary body in a direction of a rotary axis to the predetermined amount by varying a position of the adjustable member that is press-fitted to the one of the housing and the rotary body from the reference position by the predetermined amount in a direction in which the movement restricting part and the contacting part contacting with each other are separated from each other.

Abstract: A control system for a variable displacement compressor uses a mechanical valve to minimize energy consumption in an air conditioning system. The control system can also provide instantaneous indications to the vehicle controller of air conditioning power consumption to avoid engine loading. Controls are also used to contain oil within the compressor and to minimize its presence downstream of the compressor into the gas cooler and evaporator parts of the system.

Abstract: A highly accurate and relatively inexpensive control valve for a compressor. The control valve includes a pressure sensitive portion that has a metal diaphragm, which is machined with a relatively low cost. The diaphragm is held between flanges. The pressure sensitive portion is attached to a control valve portion after being subjected to a pressure leak test. The control valve portion has an engaging piece and a positioning surface. The flange contacts the positioning surface and is fixed by the engaging piece. The positioning surface is formed such that the interval between the diaphragm and the top of the valve chamber becomes a predetermined value.

Abstract: A variable displacement compressor includes a linking groove, which forms a hinge for connecting an arm and an inclining member. The groove is generally U-shaped (open). A link pin is fitted in the groove such that the link pin can pivot or slide within the groove. As a result, installation of a movable parts assembly, which is done by inserting the link pin into the groove, is easier. A controlled pressure chamber improves the response of the compressor to controls.

Abstract: A control valve has a valve body for opening and closing a valve hole and a solenoid mechanism for urging the valve body by energizing a solenoid. The solenoid mechanism includes a yoke, a plunger housing, a fixed core and a plunger. The yoke accommodates the solenoid and forms a magnetic path. The plunger housing made of stainless steel connects with the yoke, and has a central axis. The fixed core connects with the yoke. The plunger is accommodated in the plunger housing and connects with the valve body. The plunger is attracted to the fixed core to move in the direction of the central axis by applying electromagnetic force from the solenoid. Black oxide treatment is performed to the yoke after the plunger housing is brazed to the yoke.

Abstract: An object of the invention is to provide a variable displacement compressor which is capable of using a solenoid control valve which does not require a large solenoid force. The compressor is configured such that an electromagnetic proportional flow rate control valve is arranged in a refrigerant passage leading from a discharge chamber to a condenser, that a differential pressure regulating valve is arranged in a refrigerant passage leading from the discharge chamber to a crank chamber, and that a fixed orifice is arranged in a refrigerant passage leading from the crank chamber to a suction chamber, whereby the differential pressure regulating valve senses a differential pressure Pd, Pd′ generated across the electromagnetic proportional flow rate control valve, for control of pressure introduced into the crank chamber.

Abstract: In a control valve for a variable capacity compressor, a patch member is provided to a movable-side end portion of a bellows main body. A valve rod is fitted in the fitting recessed portion formed in the patch member. A compression coil spring is disposed between the patch member and a lower patch member for supporting a fixed-side end portion of the bellows main body.

Abstract: A capacity control system for a variable capacity refrigerant compressor includes an internal bleed passage coupling a crankcase chamber of the compressor to a suction port, an electrically-operated two-port control valve that selectively opens and closes a passage between the crankcase chamber and a discharge chamber, and pressure sensors for measuring the compressor discharge pressure and suction pressure. A plunger of the control valve is disposed within the passage coupling the crankcase chamber and the discharge chamber, and a solenoid armature linearly positions the plunger within the passage to open and close the passage. The plunger has an axial bore that forms a continuous passage between the discharge chamber and a cavity in which the discharge pressure sensor is retained so that the sensor is continuously exposed to the discharge pressure regardless of the plunger position.

Abstract: A control device includes a first passage, a second passage, a third passage, a displacement control valve and an auxiliary valve. The displacement control valve is placed in the first passage. The auxiliary valve includes a valve chamber, a spool valve and an urging means. The spool valve is slidably accommodated in the valve chamber. The spool valve divides the valve chamber into a first pressure chamber and a second pressure chamber, to communicate the first pressure chamber with the first passage and to communicate the second pressure chamber with the second passage. The urging means is placed in the valve chamber for urging the spool valve toward the first pressure chamber. The third passage communicates with the first pressure chamber and/or the second pressure chamber by the movement of the spool valve.

Abstract: The object of the present invention is to provide a control valve for a variable displacement compressor, which is capable of controlling the variable displacement compressor to the minimum capacity without using an electromagnetic clutch, and can be constructed without accommodating a solenoid in a pressure chamber. A plunger of a solenoid is formed by a first plunger and a second plunger, and a diaphragm is disposed between them, for sensing suction pressure Ps, such that the first plunger controls a valve element via a shaft, with component elements of the solenoid except for the first plunger being disposed on a side of the diaphragm where the atmospheric pressure is received. Further, when the solenoid is not energized, the high suction pressure Ps urges the second plunger toward the core via the diaphragm, and a spring causes the first plunger to urge the valve element to the fully open position, which enables the variable displacement compressor to be controlled to the minimum capacity.

Abstract: A first bleed passage and a second bleed passage each connect a crank chamber of a compressor with a suction chamber of the compressor. A first supply passage and a second supply passage each connect the crank chamber with a discharge chamber of the compressor. A first control valve adjusts the opening size of the first supply passage in response to the pressure in the suction chamber. A second control valve includes a ball valve and an electromagnetic actuator. The ball valve adjusts the opening size of the second supply passage and the opening size of the first bleed passage. The electromagnetic actuator moves the ball valve. The ball valve is moved to a first position and to a second position. At the first position, the ball valve closes the second supply passage and opens the first bleed passage. At the second position, the ball valve opens the second supply passage and closes the first bleed passage.

Abstract: An air conditioner for air conditioning the interior of a compartment includes a compressor and an electric motor. The compressor compresses refrigerant gas and changes the displacement. The electric motor drives the compressor. A motor controller rotates the motor at a constant reference speed. A detection device detects information related to the thermal load on the air conditioner. A current sensor detects the value of current supplied to the electric motor. A controller controls the compressor based on the detected thermal load information and the detected current value. The controller computes a target torque of the compressor based on the thermal load information. In accordance with the computed target torque, the controller computes a target current value to be supplied to the electric motor. The controller further controls the displacement of the compressor such that the detected current value matches the target current value.

Abstract: In a variable displacement swash plate type refrigerant compressor (10), a stopper (28) is provided for setting an initial angle of the inclination angle of a swash plate (23) when a drive shaft (19) is not driven. When the drive shaft (19) is driven by a driving power source of the compressor (10) under a non-operation condition of a refrigerant circuit, the stopper (28) is moved to permit the inclination angle of the swash plate (23) to be reduced from the initial angle in response to increase of compression work of the compressor (10) so as to suppress the increase of the compression work to save the driving power for the compressor (10).

Abstract: The object of the present invention is to provide a capacity control valve for a variable displacement compressor that controls flow rate without the need for increased solenoid power. A compact, low-cost capacity control valve is provided as an integrated structure of a first control valve and a second control valve. The first control valve, placed on a passageway of refrigerant discharged from a variable displacement compressor, functions as a variable orifice whose cross-sectional area can be set as desired by varying the power of a solenoid unit. Part of the refrigerant discharged at pressure PdH is supplied to the crank chamber, in which the pressure is Pc. The second control valve controls this refrigerant flow to the crank chamber in such a way that the differential pressure between upstream pressure PdH and downstream pressure PdL of the discharged refrigerant will be regulated at a specified level.

Abstract: A compressor includes a compressor main body and a power transmission mechanism. The power transmission mechanism includes a pulley and a hub. The pulley has a first inner cylinder and a second inner cylinder, which are apart from each other in the axial direction of the pulley. A one-way clutch is located on a power transmission path between the first inner cylinder and the hub. A bearing is located between the first inner cylinder and the hub. A bearing is located between the second inner cylinder and a housing of the compressor main body. A power transmission pin for discontinuing an excessive power transmission is located on a power transmission path between an engine of a vehicle and a drive shaft.

Abstract: In a vehicle air conditioner, a variable displacement compressor has a control valve for continuously changing a discharge capacity of the compressor, and a control unit calculates an electrical value DT to be applied to the control valve based on the following formula of DT=DT(n−1)+Kp[(En−En−1)+C/(Ti×En)]. In this formula, En=Te−Teo, Kp=Kp′/(Ph×Ph′), Ti=Ti′/(Ph×Ph″), C is a sampling cycle, n is a positive number, Kp′, Ti′, Ph′and Ph″ are constants, Ph is a refrigerant pressure at a high pressure side, Te is a detected air temperature at an air outlet of the evaporator, and Teo is a target evaporator air temperature that is calculated based on an outside air temperature Tam. Accordingly, the compressor can be stably controlled in a wide thermal load range.

Abstract: An air conditioning system for a vehicle that is driven by a vehicular power source. The system has a compressor selectively operable by the vehicular power source and an electric motor. The electric motor is used as a drive force of the compressor when the vehicular power source is in a non-operative state. The compressor compresses refrigerant gas introduced into a suction chamber from an external refrigerant circuit. A displacement of the compressor is variable, based on a differential pressure. The compressor has a control valve that is disposed on a refrigerant passage communicating with the crank chamber. The control valve has a valve plunger for changing an opening size of the control valve to adjust pressure in the crank chamber. The air conditioning system comprises pressure sensing member, actuator, and controller. The pressure sensing member is disposed in the control valve and applies biasing force to the plunger based on pressure in the external circuit.

Abstract: A pneumatically-operated control valve selectively opens and closes a passage between discharge and crankcase chambers of a variable capacity refrigerant compressor for purposes of controlling the compressor capacity, and includes an integral pressure sensor for measuring the compressor discharge pressure. The valve includes a plunger having an axis, a stopper biased against a seat in the passage coupling the discharge and crankcase chambers, an annular bellows and a pressure sensor. A portion of the plunger passes through the annular bellows, and one end of the bellows is attached to the plunger for axially displacing the plunger to unseat the stopper. The stopper and plunger are maintained in engagement, and have axial bores that are aligned to form a passage between the compressor discharge chamber and a cavity in which the pressure sensor is retained.

Abstract: A seal is provided between the housing assembly of a variable displacement compressor and a rotary shaft to seal inside the housing assembly. The seal is retained in a retaining chamber, which is separated from a suction chamber and a control pressure chamber. A refrigerant passage is connected to the retaining chamber to feed a refrigerant to the retaining chamber to cause the refrigerant to contact the seal. The refrigerant passage includes a path extending from outside the housing assembly to the suction chamber through the retaining chamber. A restriction ring having a restriction function guides the refrigerant from the control pressure chamber to the retaining chamber and releases an internal pressure of the control pressure chamber.

Abstract: An air conditioning system using a refrigerant to control a temperature of a climate-controlled area. The air conditioning system comprises a refrigerant circuit and a compressor coupled to the refrigerant circuit. The compressor includes a compression mechanism comprising a swash plate and at least one piston engaging the swash plate for compressing the refrigerant. An electric motor has a drive shaft that supports the swash plate at an inclination angle. The swash plate is adjustable between a plurality of inclination angles or stroke positions to adjust a current pressure in a low-side pressure portion of the refrigerant circuit. An electronic control valve adjusts the compression mechanism between the plurality of stroke positions to adjust the current pressure. A controller is programmed to control the electronic control valve until the current pressure is within a predetermined limit of a target pressure.

Abstract: A piston type compressor includes a housing, which defines a crank chamber. A valve plate forms a part of the housing. A drive shaft is located in the crank chamber. A contact member is plastically deformed and press fitted to the drive shaft. An inner wall and a first sub-plate are located in the housing and limit the axial movement of the drive shaft, respectively. After the contact member is attached to the drive shaft, the axial load required to change the position of the contact member is greater than the maximum axial load applied to the drive shaft due to the increase of the pressure in the crank chamber, and less than the load applied to the contact member by the first sub-plate in accordance with the difference in the thermal expansion coefficient of the housing and the drive shaft.

Abstract: A control valve is fluidly coupled to chambers containing fluid of different pressures for regulating flow therebetween. The control valve has a valve housing having a chamber fluidly coupled to a first chamber, a second chamber, and a third chamber. A fluid flow regulation member is disposed in the chamber and is configured to regulate fluid flow between the second chamber and the third chamber. A diaphragm is disposed substantially perpendicular to a longitudinal axis of the chamber in which longitudinal deflection of diaphragm is representative of the pressure in the first chamber.

Abstract: An apparatus for controlling compressor discharge capacity includes a variable capacity compressor, a capacity adjustment device, a signal processing device, a capacity setting device, and a signal comparing device. The capacity adjustment device regulates a discharge capacity of the variable capacity compressor. The signal processing device receives a signal corresponding to a discharge capacity of the variable capacity compressor. The capacity setting device sets a first discharge capacity target value for the variable capacity compressor. The signal comparing device compares the discharge capacity signal to the fist discharge capacity target value and sends an activation signal to the capacity adjustment device, such that the discharge capacity signal approaches the first discharge capacity value.

Abstract: A control valve includes an accommodation cylinder, a coil, a stator, a plunger, and a valve body. Electromagnetic force is generated between the stator and the plunger and the plunger moves relative to the stator. The valve body adjusts the opening degree of a valve hole. A flat surface and a peripheral wall are formed in an end of the stator. The peripheral wall has a tapered cross-section with an inclined inner surface. The inclined inner surface and the flat surface define a recess. The plunger has a frustum portion. The frustum portion includes a flat distal surface and an annular inclined surface. The taper angle of the peripheral wall is equal to or less than twenty degrees. The diameter of the flat distal surface of the frustum portion is equal to or greater than eighty percent of the largest diameter of the annular inclined surface.

Abstract: A control valve has a valve housing and a valve chamber defined in the valve housing. A valve body is accommodated in the valve chamber for adjusting the opening degree of a supply passage. A pressure sensing chamber is defined in the valve housing. The pressure at a pressure monitoring point in a refrigerant circuit is applied to the pressure sensing chamber. A bellows is located in the pressure sensing chamber. The bellows has a movable end. A transmission rod is slidably supported by the valve housing. The transmission rod includes the valve body. A support spring is located between the inner wall of the pressure sensing chamber and the movable end of the bellows. The spring supports the movable end such that the movable end can be displaced. The movable end of the bellows includes a protrusion such that the spring and the movable end of the bellows are fitted to each other.

Abstract: A variable displacement compressor includes a housing assembly having a control pressure chamber. A drive shaft is rotatably supported by the housing assembly. Cylinder bores, each accommodating a piston, are formed about the drive shaft. Each piston defines a compression chamber inside the corresponding cylinder bore. Each piston compresses refrigerant drawn into the corresponding compression chamber from a suction pressure zone and discharges the refrigerant to a discharge pressure zone. The inclination of a swash plate changes in accordance with the pressure in the control pressure chamber. A supply passage connects the control pressure chamber to the discharge pressure zone. A pressure release passage connects the control pressure chamber to the suction pressure zone. A shutter, which is made of synthetic resin or rubber and includes a restricting passage, closes one of the supply passage and the pressure release passage.

Abstract: Variable displacement compressors (101) include a displacement control valve (181) that is in communication with a drive chamber (111). The output displacement of the compressor varies in response to changes in pressure within the drive chamber. A controller (203) may control the displacement control valve so that the pressure within the drive chamber is maintained within a predetermined range. Further, the predetermined range may be determined based upon one or more factors that cause fluctuations in the pressure within the drive chamber during operation of the compressor.

Abstract: A piston type variable displacement fluid machine includes a drive shaft and a cylinder bore. A piston reciprocates along a line of movement in the cylinder bore in accordance with the rotation of the drive shaft. The stroke of the piston is varied between the maximum stroke and the minimum stroke, which is greater than zero. The displacement of the fluid machine is changed in accordance with the stroke of the piston. A ring groove is formed on the outer circumferential surface of the piston. A piston ring is fitted in the ring groove and moves with respect to the piston in the line of movement of the piston. An allowable movement amount of the piston ring with respect to the piston is greater than or equal to the minimum stroke of the piston.

Abstract: A compressor is disclosed having a gas extraction passage, internally formed in a drive shaft and continuously communicating with a crank chamber and a suction chamber, that has an inlet portion, to be exposed to the crank chamber, is formed in the drive shaft in a radial direction. As a result, mist-like oil accompanied by blow-by gas tending to flow into the gas extraction passage initially impinges upon and adheres to an inner peripheral surface of the inlet portion of the gas extraction passage due to rotational movement of the drive shaft. Namely, oil separation (gas-liquid separation) occurs at the inlet portion of the gas extraction passage. Then, oil separated from the blow-by gas at the inlet portion of the gas extraction passage is forcibly returned to the crank chamber due to a centrifugal force caused by rotational movement of the drive shaft.

Abstract: A variable displacement compressor has a control valve for controlling the displacement of the compressor. When the pressure in a discharge chamber of the compressor (discharge pressure) is equal to or higher than a first threshold value, a controller executes a limiting control for limiting the discharge pressure. During the limiting control, the controller gradually decreases a duty ratio, which is sent to the control valve, such that the displacement of the compressor is gradually decreased. When the duty ratio is decreased to a reference duty ratio, the controller sets the duty ratio to zero %. As a result, the compressor displacement is minimized and the discharge pressure is lowered. Therefore, the pipes of an external refrigerant circuit does not receive excessive load based on high discharge pressure.