Abstract: A swash-plate type piston pump includes a cylinder block configured to be rotated with rotation of a driving shaft, a plurality of pistons accommodated in a plurality of cylinders provided in the cylinder block, a swash plate configured to reciprocate the piston so that a volume chamber of the cylinder is expanded/contracted with the rotation of the cylinder block, an biasing mechanism configured to bias the swash plate in a direction where a tilting angle is made larger, a control pin configured to drive the swash plate in a direction where the tilting angle is made smaller in accordance with a rise in a load pressure of a pressure chamber, and a discharge channel configured to discharge the load pressure of the pressure chamber.

Abstract: Provided is a hydraulic circuit, for a construction machine, which drives an actuator by merging pressure oil from a fixed-volume pump into a center bypass oil path from a variable-volume pump to an oil tank, wherein the flow rate of flow from the fixed-volume pump to the center bypass oil path can be controlled in accordance with a requested flow rate of the actuator.

Abstract: A first torque control proportional electromagnetic valve (37) is connected through a first torque control line (41) to a third pressure receiving chamber (32D) in a first torque control regulator (32). A second torque control proportional electromagnetic valve (38) is connected through a second torque control line (42) to a third pressure receiving chamber (35D) in a second torque control regulator (35). The first and second torque control proportional electromagnetic valves (37, 38) are controlled by a controller 47. A switching valve (48) is provided between the first torque control line (41) and the second torque control line (42). The switching valve (48) supplies an output pressure of the first torque control proportional electromagnetic valve (37) to the third pressure receiving chamber (35D) in the second torque control regulator (35) at the time of driving hydraulic motors (2B, 2C) for left side and right side traveling.

Abstract: A hydraulic machine unit that can be operated with various working forces, in which working medium is selectively delivered, via a pump-piston accumulator system, to a main cylinder and at least one driving cylinder, wherein at least for one working stroke a pump system of the pump-piston accumulator system is used to provide working medium to a piston accumulator of the pump-piston accumulator system, and then at least for the working stroke at least the main cylinder is charged with a working pressure from the piston accumulator, and wherein at least for a return stroke the at least one driving cylinder is charged with a return stroke pressure from the pump-piston accumulator system, can be of structurally simple configuration if, at reduced working forces, the working pressure is reduced with respect to the piston accumulator pressure prevailing in the piston accumulator.

Abstract: A variable displacement hydraulic pump or motor includes: a swash plate; a lever supported by a housing and configured to rotate in conjunction of tilting of the swash plate; and a sensor configured to detect a displacement amount of the lever.

Abstract: The invention relates to a method for controlling an emergency device of a helicopter, said helicopter comprising a rotor suitable for being rotated, said emergency device being suitable for supplying additional emergency propulsion power to the helicopter, in said method comprising a step (10) of measuring the rotation speed of the helicopter rotor, a step (12) of calculating the drift of the measured rotation speed, a step (20) of continuously verifying conditions such that the speed of rotation of the rotor is higher than a predetermined value, referred to as arming speed, and the drift of the rotation speed is lower than a predetermined value, referred to as arming drift, and a step (22) of activating the emergency device if the verified conditions are validated.

Abstract: A portable tool, capable of being moved by persons, users and/or operators, includes a motor; a fluid reservoir; a pump connected to the reservoir and the motor; a work cylinder connected to an output of the pump; an actuable tool component connected to the work cylinder; a sensor in the recue tool connected to any one or more than one of the motor, the reservoir, the pump, the work cylinder, and the tool; a controller configured to receive measurement signals from the sensor; and at least one controlled valve in a hydraulic circuit defined by the reservoir, the pump and the work cylinder and connected to the controller. The controlled valve and the controller are configured to selectively at least substantially block or open any fluid channel in the hydraulic circuit. A pump of or for such a rescue tool.

Abstract: A variable stroke high pressure pump is disclosed. The pump uses a wobble plate design with dynamically variable tilt to provide continuous adjustment of pump stroke length and output. Dynamically variable tilt is accomplished using a linearly actuated tilt thruster rotationally coupled to the drive shaft to maintain a selected tilt of the wobble plate through the rotation of the wobble plate.

Abstract: When a swing motor and a boom cylinder are driven simultaneously, a hydraulic drive system appropriately adjusts a distribution of torques between hydraulic pumps and feeds back a torque actually consumed by the hydraulic pump for actuating the swing motor accurately to the hydraulic pump for actuating the boom cylinder. To that end, when boom raising and swinging are performed simultaneously, the hydraulic drive system corrects an allowable torque of a hydraulic pump 302 that supplies a hydraulic fluid to a swing motor 3c so as to be lowered by a certain ratio, reducing allowable torques of hydraulic pumps 102 and 202 that supply a hydraulic fluid to a boom cylinder 3a by torques consumed by the hydraulic pumps 102 and 202 that supply a hydraulic fluid to the swing motor 3c.

Abstract: A control device for a hydraulic machine such as a revolving excavator work machine having a structure that can cope with such an engine output decreasing environment as a work under a low atmospheric pressure at a high altitude without generating noise caused by engine rotation number increase. The control device corrects a control output value to be applied to an electromagnetic proportional valve for load-sensing valve control in a load-sensing type pump control system, based on a detected state quantity related to the engine output decreasing environment. When an engine speed-sensitive pump control system is adopted, a control output value generated based on a detected decrease in the actual engine rotation number is combined with a control output value generated by the load-sensing type pump control system.

Abstract: A hydraulic system includes a piston, a swash plate opposed to the piston, and a swash plate supporting member supporting the swash plate so that a tilt of the swash plate is variable. An oil reservoir portion is provided between the swash plate and the swash plate supporting member, the oil reservoir portion communicating with a pressure oil introducing passage. An area of the oil reservoir portion between the swash plate and the swash plate supporting member varies with the tilt of the swash plate.

Abstract: A hydraulic pump system includes a pump control system operable to reduce electric current required at the start of the pump and reduce starting torque for the pump. The pump control system can include a gap between a spring seat and a valve spool such that the valve spool need not overcome a biasing force from a swash plate when the swash plate changes from its maximum displacement position to its neutral position.

Abstract: A control mechanism for a hydrostatic transmission includes a piston rod, a neutral biasing spring, a piston, a cylinder case provided with a first fluid chamber and a second fluid chamber, a solenoid valve capable of selectively supplying pressurized fluid to the first fluid chamber and the second fluid chamber, a pivot shaft configured to swingably support the cylinder case, and a first relief valve configured to flow the hydraulic fluid from the first fluid chamber to the second fluid chamber when a hydraulic pressure in the first fluid chamber exceeds a set pressure, and a second relief valve configured to flow the hydraulic fluid from the second fluid chamber to the first fluid chamber when a hydraulic pressure in the second fluid chamber exceeds a set pressure.

Abstract: An example pump includes: (i) a swash block having (a) a first trunnion arm on a first side of the swash block, and (b) a second trunnion arm on a second side of the swash block; and (ii) a housing including (a) a through-hole disposed on a respective first side of the housing, (b) a blind hole disposed on a respective second side of the housing opposite the respective first side thereof, and (c) an internal chamber. The swash block is supported within the internal chamber of the housing by the first trunnion arm being positioned in the through-hole of the housing and the second trunnion arm being positioned in the blind hole of the housing.

Abstract: A hydrostatic axial piston machine includes a housing and a pivot cradle. At least one slide bearing of the pivot cradle on a high-pressure side is hydrostatically relieved. The slide bearing includes one or two pairs of relief grooves. A relief pressure field develops about and between the one or two pairs of relief grooves as the grooves are supplied with relief pressure medium on one side and are closed at their outer ends. An optional slide bearing on a low-pressure side has one or two limiting grooves which delimit the relief pressure field there, as the limiting grooves are open at their outer ends.

Abstract: A housing of a hydraulic pump is configured to have a servo unit detachably attached thereto so as to control tilt direction and angle of its movable swash plate. A port block is formed therein with a pair of main ports and, and a pair of main fluid passages and fluidly connecting respective main ports and to cylinders in its cylinder block. Main ports are used to have respective external pipes connected thereto so as to fluidly connect the hydraulic pump to a hydraulic motor disposed outside of the hydraulic pump, thereby constituting a hydrostatic transmission.

Abstract: An externally-controlled variable displacement compressor (EVDC) cold-start method is described including, during an EVDC cold-start procedure, iteratively alternating an amount of a control current supplied to an electronic control valve (ECV) associated with the EVDC between no control current and a full control current. Systems for implementing the described method are provided.

Abstract: A variable displacement compressor which prevents leakage of a refrigerant flowing directly into a suction chamber without passing via a crank chamber at a time of a minimum discharge displacement operation, thus making it possible to prevent an increase of a minimum discharge displacement by increasing a refrigerant pressure in the crank chamber, and in addition, making it possible to prevent insufficient lubrication of sliding portions and the like in the crank chamber.

Abstract: An air-conditioner may include an evaporator, a compressor configured to compress refrigerant supplied to the evaporator and a clutch configured to transmit power needed to operate the compressor to the compressor or to prevent power from being supplied to the compressor, wherein the clutch prevents power from being supplied to the compressor when an actual measurement temperature of the evaporator reaches a lower limit threshold temperature selected among the lower limit threshold temperature and an upper limit threshold temperature and the lower limit threshold temperature is changeable, and the upper limit threshold temperature is relatively higher than the lower limit threshold temperature and is changeable.

Abstract: The invention relates to a device (10) for controlling the displacement of a machine (20) with axial pistons comprising a case (23) that houses a control unit comprising a displacement control spool (110) adapted to be switched between two positions by a control pressure (Ps) according to an axis of sliding (?): a working position wherein the control spool (110) provides a connection between at least one inlet (103, 104) that receives a supply pressure and an outlet (105, 106) connected to a cylinder for adjusting the inclination of said machine (31a, 31b), and an idle position wherein the control spool (110) interrupts the connection between said inlet (102, 104) and said outlet (101, 103), and comprising means for switching adapted to vary the position of the adjusting cylinder (31a, 31b), a spring (140), characterised in that: said means of communication comprise a second switching spool (130), coaxial to the control spool (110), a switching pressure (Pm) exerts an axial force on the second spool (130) in

Abstract: A hydraulic pressure control device comprising: a hydraulic sensor provided between a hydraulic pump and a load; a speed command arithmetic unit configured to output a speed command value Vc based on a difference between a hydraulic pressure detection value Pd from the hydraulic sensor and a hydraulic pressure command value Pc; a torque command value arithmetic unit configured to calculate a torque command value Tc based on a difference between a speed detection value Vd of a motor and the speed command value Vc; a current controller configured to control current of the motor based on the torque command value Tc; and a hydraulic pressure abnormality detector configured to detect whether a hydraulic circuit has abnormality based on the speed command value Vc and an operating condition of the load of the hydraulic circuit commanded from an upper-level control device.

Abstract: A thrust vector control system is provided. The thrust vector control system may comprise an anti-stall hydraulic pump configured to deliver hydraulic fluid to at least one actuator, wherein each actuator may be configured to move an exhaust nozzle of a space vehicle. The anti-stall hydraulic pump may provide thermal conditioning to the thrust vector actuation control system during ground operation and/or periods of low output operation.

Abstract: The invention relates to a method, system and apparatus to allow the collection of data relating to at least one parameter of an item of currency and which data can be used to generate a new or updated dataset for the same and which can be used by validation apparatus for said items of currency. The collected data is transmitted from a location which is remote from that at which the new data set is generated and the new dataset is transmitted to the said remote location and/or other locations so as to allow the new or updated dataset to be used by the apparatus.

Abstract: Provided is a hybrid work machine in which a hybrid system and a downsized engine are used. The hybrid work machine performs rapid charging of a power storage device while preventing decreases in the output power of a hydraulic pump. A vehicle body controller performs engine revolution speed decreasing control in which, if the charge rate of a battery becomes equal to or less than a minimum charge rate, the target revolution speed of an engine is reduced. The vehicle body controller also performs torque reducing control in which the maximum absorption torque of a hydraulic pump is reduced. By performing these control operations, the vehicle body controller coercively generates surplus torque for the engine and operates a generator-motor as a generator.

Abstract: A piston compressor may prevent excessive oil from accumulating in a crank chamber while securing the supply of oil to a swash plate. In a piston compressor in which an oil separation passage is formed in a shaft and a crank chamber communicates with a suction chamber through the oil separation passage, a supply passage opens at a region of a cylinder block opposed to a swash plate to allow a working fluid introduced from a discharge chamber into the crank chamber to be supplied to the swash plate and a bypass passage allowing the crank chamber to constantly communicate with the suction chamber is provided to prevent the accumulation of excessive oil in the crank chamber regardless of the operation condition. The bypass passage communicates with the crank chamber at a region positioned in the outer side of a rotation trajectory of the swash plate in the radial direction.

Abstract: A hydrostatic axial piston machine (1) with a cylinder barrel (2) having at least one piston bore (3) in which is located a power unit piston (4) supported on a cam disk (18). A control surface (5) is stationary relative to the housing and is on a control base (6), against which control surface the cylinder barrel (2) is in contact. In the control base (6) there are a kidney-shaped inlet connection (8) and a kidney-shaped outlet connection (9). The sealing web surface on the control surface 5 on the control base (6) in the vicinity of the inlet connection (8) is reduced, so that in operation as a motor, when there is a pressurization of the inlet connection (8), a reduction of the hydrostatic relief force is achieved. In operation as a motor, a residual application of the cylinder barrel (2) against the control surface (5) from a hold-down force of a hold-down spring (24) that is in an operative connection with the cylinder barrel (2) and/or pressing cylinder compression forces is preserved.

Abstract: An object to reduce a relief amount at the start of turning. A hydraulic drive system of a construction machine includes: a turning control valve disposed on a first circulation line extending from a first pump; a boom control valve disposed on a second circulation line extending from a second pump; first and second regulators, which change tilting angles of the first and second pumps; and a controller, which controls one or more solenoid proportional valves, which output a secondary pressure to the first and second regulators. While a turning operation is being performed, if a discharge pressure of the first pump is higher than a first setting value and a discharge pressure of the second pump is lower than a second setting value, the controller lowers first and second horsepower control lines that restrict discharge flow rates of the first and second pumps.

Abstract: A fixed wobbler of a hydraulic unit includes a body having a first end and an opposite second end, the first end defining a first surface, and the second end defining a second surface oriented at an angle relative to the first surface, the body having an outer diameter and an inner wall defining an inner diameter, wherein the outer diameter is approximately 2.1655+0.0000?0.0007 inches (5.5004+0.000?0.0018 cm), and wherein the inner diameter is approximately 1.043±0.003 inches (2.6492±0.0076 cm).

Abstract: The present disclosure relates to a method, a device, and a system for controlling a hydraulic pump of a construction machine, the system comprising: an engine; an engine control unit configured to control the engine by using engine limit torque information and current engine torque information of the engine; a hydraulic pump operated by power supplied from the engine; at least one actuator driven by a hydraulic pressure discharged from the hydraulic pump; and a hydraulic pump control device configured to control a limited swash plate angle of the hydraulic pump by using a torque of the hydraulic pump and the engine limit torque information received from the engine control unit.

Abstract: An energy recovery system includes cylinders that articulate a hydraulic tool in a pump mode to provide potential energy and in a motor mode to recover the potential energy. The energy recovery system includes a tank that stores a hydraulic fluid for the cylinders and an open circuit variable displacement pump that circulates the hydraulic fluid in the pump mode from the tank to the cylinders and in the motor mode from the cylinders to the tank. The open circuit variable displacement pump includes a swashplate articulable between a positive position and a negative position. In the positive position, the hydraulic fluid circulates in the pump mode and in the negative position the hydraulic fluid circulates in the motor mode. The open circuit variable displacement pump includes an actuator that articulates the swashplate and a bias system that maintains the swashplate in a positive position when the hydraulic fluid is not in circulation.

Abstract: A hydraulic axial-piston machine achieves a control cut-off by an additional control edge of a control valve of an actuating mechanism for swiveling a swash plate.

Abstract: A variable displacement type swash plate compressor includes a housing having therein a suction chamber, a discharge chamber, a control pressure chamber, a shaft hole, and cylinder bores. The compressor further has a drive shaft, a swash plate, an inclination angle changing mechanism, pistons, introduction passages, and a valve mechanism. The valve mechanism includes a valve element is disposed in a passage connecting the control pressure chamber and the suction chamber. The valve element is integrally rotatable with the drive shaft and axially movable by a pressure difference across the valve element. An opening of the residual gas bypass passage is changed by the axial movement of the valve element. The valve element selectively connects and disconnects the introduction passages with the residual gas bypass passage.

Abstract: An adjustment device for regulating the torque of a hydrostatic piston machine with adjustable swept volume, comprises an adjustment piston delimiting an adjustment chamber, a regulation valve defining a valve bore and including a valve slide positioned in the valve bore that controls inflow and outflow of pressure medium, and first and second feedback springs configured to exert feedback force on the valve slide in first and second displacement directions dependent on a position of the adjustment piston. The device further includes a regulation spring configured to exert a force on the valve slide in a second displacement direction. During an adjustment of the adjustment piston in a direction of maximum swept volume of the piston machine, beyond a particular position of the adjustment piston, the first and second feedback springs exert an increased force on the valve slide determined only by a spring constant of the first feedback spring.

Abstract: A method for controlling a compressor of a refrigeration system wherein refrigerant flow through the compressor is controlled by at least one valve, whereby the valve is opened or closed in a cycle of consecutive time intervals of an identical length, so that the valve is either completely closed or completely open during a time interval, whereby a. determining a percentage capacity for the compressor-corresponding to the current refrigeration requirement of a refrigeration location, b. determining the open time percentage of the valves over a number of time intervals, c. opening the valve for the following time interval when the ratio of the percentage capacity is greater than that of the open time percentage previously determined, and d. closing the valve-for the following time interval when the ratio of the percentage capacity is smaller than that of the open time percentage of the valves previously determined.

Abstract: Embodiments are disclosed that relate to controlling a compressor. In one example, method of controlling a compressor comprises regulating a discharge capacity of the compressor via a control current supplied to a control device, holding the control current supplied to the control device at substantially zero amperes for a first duration, and stepping the control current from substantially zero amperes to a sustainable current that provides a sustainable level of a performance parameter of the compressor.

Abstract: An actuator of a compressor includes a partitioning body, which is rotatable integrally with a drive shaft and loosely fitted to the drive shaft in the swash plate chamber, a movable body, which is coupled to a swash plate and movable relative to the partitioning body along the axis of the drive shaft, and a control pressure chamber, the pressure of which moves the movable body. A control mechanism changes the pressure of the control pressure chamber to move the movable body. A link mechanism shifts a top dead center of a first head of a piston over a longer distance than a top dead center of a second head of the piston when the inclination angle of the swash plate changes. The actuator is located at the same side as the first cylinder bore, which accommodates the first head, as viewed from the swash plate.

Abstract: A swash plate compressor 100 includes a swash plate 111 that rotates with a drive shaft 110, a pair of shoes 137a and 137b placed to sandwich a portion of the swash plate 111 close to a periphery of the swash plate 111, and a piston 136 connected to the swash plate 111 via the pair of shoes 137a and 137b. The piston 136 reciprocates in a cylinder bore 101a as the swash plate 111 rotates due to the rotation of the drive shaft 110. In the swash plate compressor 100, a zinc phosphate film is formed on each portion of the piston 136 at which the corresponding shoe 137a, 137b is in sliding contact. This reduces occurrence of galling or seizing at the sliding contact portions between the piston 136 and the shoes 137a and 137b.

Abstract: The present disclosure relates to a control circuit for a variable displacement pump in a vehicle transmission, including: a regulator valve configured to regulate displacement control fluid to the variable displacement pump; and a response limiter in communication with the regulator valve, configured to mitigate pressure oscillations in the control circuit.

Abstract: A variable displacement swash compressor includes a housing, a drive shaft, a swash plate, a link mechanism, pistons, a conversion mechanism, an actuator, and a control mechanism. The housing includes a suction chamber, a discharge chamber, a swash plate chamber, and cylinder bores. The control mechanism controls the actuator. The actuator includes a partitioning body, a movable body, and a control pressure chamber. At least one of the suction chamber and the swash plate chamber is a low pressure chamber. The control mechanism includes a control passage, which connects the control pressure chamber, the low pressure chamber, and the discharge chamber, and a control valve, which adjusts the open degree of the control passage. The control passage is partially formed in the drive shaft. The movable body increases the inclination angle of the swash plate when the pressure of the control pressure chamber increases.

Abstract: An axial piston pump may comprise a valve plate assembly including a plurality of valve plates rotatably disposed adjacent to each other and configured to control the flow of fluid between a piston chamber and inlet and outlet port passages. The piston pump may also comprise a swashplate arrangement that is capable of being angled in two different directions to be used in combination with the valve plate assembly. A fixed displacement axial piston pump may also comprise the valve plate assembly disclosed herein in which pressure transitions are facilitated in the same fashion, but without the variable of changing swashplate angles which control pump flow.

Abstract: A variable displacement swash compressor includes a housing, a drive shaft, a swash plate, a link mechanism, a piston, a conversion mechanism, an actuator, and a control mechanism. The swash plate is rotatable together with the drive shaft in a swash plate chamber. The conversion mechanism reciprocates the piston in a cylinder bore. The actuator is operative to change the inclination angle of the swash plate. The actuator is rotatable integrally with the drive shaft. The actuator includes a partitioning body, a movable body, and a control pressure chamber. The control mechanism changes the pressure of the control pressure chamber to move the movable body. The movable body and the link mechanism are located at opposite sides of the swash plate.

Abstract: A method for operating a well tractor is presented. The method involves running a well tractor coupled to a wireline into a wellbore and supplying an amount of electric power to the well tractor to operate the well tractor at a first speed to urge the wireline through the wellbore at a first force. A variable gear ratio transmission of the well tractor is adjusted and an amount of electric power is supplied to the well tractor to operate the well tractor at a second speed different than the first speed to urge the wireline through the wellbore at a second force different than the first force based on adjusting the variable gear ratio transmission.

Abstract: In a piston pump assembly, cradle bearings support a swash plate on an inner surface of a housing assembly. The cradle bearing and/or the corresponding portion of the housing inner surface may have undercut portions allowing deflection of an inward portion of the cradle bearing when the swash plate is subjected to pressure forces from hydraulic fluid compressed within pump cylinders by the pump pistons. Deflection of the cradle bearings allows increased contact pressure to be further distributed across the engaging surfaces of the swash plates and the cradle bearings.

Abstract: A hinge assembly for coupling a rotor assembly to a swash plate assembly in a variable displacement compressor includes a hub integrally formed with the swash plate assembly and a pair of spaced part arms coupled to the hub and extending outwardly therefrom. Each of the arms having an aperture formed in a distal end thereof. At least one support member extending from the rotor assembly and having a slot formed therein. A hinge pin is slideably received in the slot of the at least one support member and received in the aperture of each of the arms to hingedly couple the arms to the at least one support member.

Abstract: A swash plate type variable displacement compressor includes, a housing, a swash plate disposed in the housing and having therethrough an insertion hole, a rotary shaft inserted through the insertion hole of the swash plate, a plurality of pistons engaged with the swash plate, and a connecting member disposed between the rotary shaft and the swash plate and connecting the rotary shaft and the swash plate so as to change inclination angle of the swash plate relative to the rotary shaft. A pair of projections are provided in the insertion hole so as to extend toward the rotary shaft and restrict the movement of the swash plate relative to the rotary shaft. The paired projections are spaced away from each other so as not to be in contact with the rotary shaft simultaneously.

Abstract: A variable displacement swash compressor includes a housing, a drive shaft, a swash plate, a link mechanism, a piston, a conversion mechanism, an actuator, and a control mechanism. The swash plate is rotatable together with the drive shaft in a swash plate chamber. The conversion mechanism reciprocates the piston in a cylinder bore. The actuator changes the inclination angle of the swash plate. The actuator is rotatable integrally with the drive shaft. The actuator includes a partitioning body, a movable body, and a control pressure chamber. The control mechanism changes the pressure of the control pressure chamber to move the movable body. The movable body is adapted to pull the swash plate and increase the inclination angle when the pressure of the control pressure chamber increases.

Abstract: A variable displacement hydrostatic power unit (7) is in a drive connection with an internal combustion engine (2). When operated as a pump, the power unit (7) delivers hydraulic fluid to at least one consumer (V). When operated as a motor, the power unit (7) is a hydraulic starter for the internal combustion engine (2) and is supplied with hydraulic fluid from a hydraulic accumulator (25). The displacement volume of the power unit (7) is set by a displacement volume control device (50) actuated by a positioning device (52). The displacement volume control device (50) is displaced into a position with maximum displacement volume by a corresponding actuation of the positioning device (52) chronologically prior to the shutoff of the internal combustion engine (2). A securing device (60) holds the displacement volume control device (50) in the maximum displacement volume position when the internal combustion engine (2) is shut off.

Abstract: A swash plate type variable displacement compressor includes a housing having a suction chamber, a discharge chamber, a swash plate chamber in communication with the suction chamber, a first cylinder block having a plurality of first cylinder bores and a second cylinder block having a plurality of second cylinder bores. The first cylinder bores and the second cylinder bores cooperate to form plural pairs of the first and second cylinder bores. The first cylinder block and the second cylinder block have on outer peripheral side thereof a first projection and a second projection projecting radially, respectively. The first projection and the second projection cooperate together to form an oil separation chamber, an oil reserve chamber, an intermediate pressure chamber and a gas release passage that provides fluid communication between the oil reserve chamber and the intermediate pressure chamber.

Abstract: A fourth pin that slides on a rotary shaft is provided to a swash plate. A guiding surface for guiding the fourth pin is provided to the rotary shaft. The fourth pin is guided by the guiding surface, the swash plate is supported by the rotary shaft via the fourth pin, and a force having a component in a direction orthogonal to the direction of movement of a movable body acting on the swash plate is thereby reduced. Accordingly, there is a reduction in the force, which has a component in a direction orthogonal to the direction of movement of the movable body, acting on a coupling section of the movable body via a third pin from the swash plate. As a result, when the inclination of the swash plate is changed, unwanted tilting of the movable body relative to the direction of movement is suppressed.

Abstract: A double-headed piston type swash plate compressor 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.