Abstract: A first swash plate 18 is coupled to a drive shaft 16 to be rotatable integrally with the drive shaft 16. Single head pistons 23 are coupled to the first swash plate 18 via shoes 25A, 25B. Rotation of the drive shaft 16 rotates the first swash plate 18, which causes the pistons 23 to reciprocate and compress refrigerant gas. The first swash plate 18 supports an annular second swash plate 51 to be rotatable relative to the first swash plate 18 via a ball bearing 52. The second swash plate 51 is arranged between the first swash plate 18 and the shoes 25B that receive a compressive load to be slidable with respect to the first swash plate 18 and the shoes 25B. Therefore, the first swash plate reliably slides with respect to the second swash plate.

Abstract: A swash plate compressor that prevents a slide plate from being separated from a swash plate. The compressor includes a drive shaft. A slide plate is rotatable relative to the swash plate. Two shoes is arranged on the swash plate and the slide plate. A bearing arranged between the swash plate and the slide plate and in between the shoes. A piston is connected to the swash plate and the slide plate by the shoes and is reciprocated to compress gas. The swash plate includes a swash plate support surface, and the slide plate includes a slide plate support surface, in which each surface is for contacting the bearing. The swash plate is formed so that a clearance between the swash plate support surface and the slide plate support surface increases radially inwardly of the swash plate and the slide plate.

Abstract: A displacing device is incorporated in a displacement control valve. The displacing device includes a first pressure chamber, a second pressure chamber, a second bellows, a transmission rod, and an urging spring. The second pressure chamber communicates with a suction chamber. The interior of the second pressure chamber is a suction pressure zone. When the pressure in the suction pressure zone is less than or equal to a predetermined reference pressure, the transmission rod moves an actuation rod (valve body) to open a valve hole. Therefore, a variable displacement compressor is prevented from operating with a large displacement when there is insufficient amount of refrigerant or when the speed of the compressor is high.

Abstract: A displacement control valve includes a reciprocation body which has a valve body. The reciprocation body includes a first shaft portion that has the valve body and a second shaft portion that is coaxial with the first shaft portion and inserted in a valve hole. The first shaft portion is located adjacent to a solenoid. The second shaft portion is connected to a pressure sensing mechanism. The second shaft portion and the valve hole define a flow path in which refrigerant freely flows. A throttle portion is formed between the first and second shaft portions and coaxial with the first and second shaft portions. Diameter of an end of the throttle portion adjacent to the second shaft portion is set larger than that of the second shaft portion adjacent to the throttle. Flow rate of the refrigerant in the flow path is suppressed by the throttle portion.

Abstract: A swash plate type variable displacement compressor includes a housing, a drive shaft, a piston, a lug plate, a swash plate, a hinge mechanism provided between the lug plate and the swash plate, and a control mechanism. The hinge mechanism includes a restraining hinge element that is located on a suction side with respect to a first imaginary plane that includes a top position of the swash plate corresponding to the top dead center position of the piston and the axis of the drive shaft for restraining the lug plate and the swash plate from rotating relative to each other and the swash plate to move away from the lug plate. The hinge mechanism further includes a non-restraining hinge element that is located on a discharge side with respect to the first imaginary plane for not restraining the swash plate from moving away from the lug plate.

Abstract: Refrigerant gas is introduced into a suction chamber through a suction line. Refrigerant gas is allowed to flow from the crank chamber into the suction chamber through an outlet line. An open degree adjustment valve (34) has a first valve body for adjusting an open degree of the suction line and a second valve body for adjusting an open degree of the outlet line. The first valve body and the second valve body are connected to each other. The first valve body moves in such a manner as to increase the open degree of the suction line when the difference between the pressure in the suction chamber and the pressure in the crank chamber decreases, and reduce the open degree of the suction line when the difference between the pressure in the suction chamber and the pressure in the crank chamber increases. Thus, variation of gas pressure is reliably suppressed while maintaining favorable starting performance of the compressor.

Abstract: A displacement control mechanism for a variable displacement compressor includes a first valve hole, a first valve body, a pressure sensing means operable to sense pressures of first and second points in a discharge pressure region to adjust a position of the first valve body, and a pressure-difference-increasing means operable to increase pressure difference between the first and second points when the pressure of a suction pressure region falls below a predetermined standard pressure. The pressure sensing means displaces the first valve body to increase an opening degree of the first valve hole according to increase of the pressure difference when the first valve hole is part of a supply passage. The pressure sensing means displaces the first valve body to decrease the opening degree of the first valve hole according to the increase of the pressure difference when the first valve hole is part of a bleed passage.

Abstract: A displacement control valve for a variable displacement compressor includes a first valve hole forming a part of a supply passage and a second valve hole forming a part of a discharge passage. Displacement of a reciprocating body is transmitted to each of first and second valve bodies so that each valve body opens or closes the corresponding valve hole. When the reciprocating body is within a predetermined displacement range, a double closing state occurs, in which the first valve body closes the first valve hole and the second valve hole closes the second valve hole. When the reciprocating body is out of the displacement range, a single closing state occurs. Therefore, the control valve prevents the first valve hole from opening concurrently with the second valve hole.

Abstract: The piston type compressor includes a cylinder block, a rotary shaft, a plurality of pistons, a rotary valve and radial load transmission means. The radial load transmission means transmits a radial load caused by compression reaction force acting on the piston, which is on its compression stroke of the discharge stroke, to the rotary valve, thereby pressing the rotary valve against an inner peripheral surface of the valve chamber. The radial load transmission means has a direction turning portion for turning the radial load toward the inner peripheral surface of the valve chamber between the suction port communicating with the cylinder bore whose piston has completed the discharge stroke and the suction port communicating with the cylinder bore whose piston is on the compression stroke in a rotation direction of the rotary valve from the suction port communicating with the cylinder bore whose piston has completed the discharge stroke.

Abstract: A variable speed compressor has a housing, a compression mechanism and a variable speed mechanism including input and output shafts and a carrier each rotatable around a first axis, planetary cones received by the carrier and each rotatable around a respective second axis inclining to the first axis, and a control ring coaxial with the first axis to vary the speed of rotation of the planetary cones to move along the first axis. The rotating speed of the input shaft is controllably transmittable to the output shaft by transmitting torque thereof to the output shaft so that the input and output shafts and the control ring contact the planetary cones. The control ring having a cylindrical shape has first and second pressure sensing surfaces coaxial with the first axis, formed on the opposite side thereof, sensing pressure applied to the sensing surfaces for movement.

Abstract: A compressor has a valve port plate made of a steel, through which heat of compressed gas having a relatively higher temperature is transmitted to suction gas having a relatively lower temperature. The valve port plate is nitrided or nitrocarburized for reducing heat transmission from the compressed gas to the suction gas.

Abstract: A compressor has a valve port plate made of a steel, through which heat of compressed gas having a relatively higher temperature is transmitted to suction gas having a relatively lower temperature. The valve port plate is carburized to have a carburized layer for reducing heat transmission from the compressed gas to the suction gas.

Abstract: A compressor includes a suction chamber, a working chamber, a discharge chamber, a discharge valve and a thermal insulating member. A low-pressure compressible fluid resides in the suction chamber. The low-pressure compressible fluid in the suction chamber is introduced into the working chamber and is compressed to a predetermined pressure. The compressed compressible fluid in the working chamber is discharged into the discharge chamber. The discharge valve is interposed between the working chamber and the discharge chamber. The thermal insulating member is disposed in the discharge chamber. The thermal insulating member has an opening restricting portion for restricting the maximum opening degree of the discharge valve.

Abstract: A link mechanism provided between a lug plate and a cam plate in a variable displacement compressor includes a first transmitting portion for transmitting rotation of a lug plate to a cam plate and a second transmitting portion for transmitting compression reactive force from the cam plate to the lug plate, which are arranged along a rotational direction of the drive shaft. The first transmitting portion includes a first transmitting surface and a first receiving surface. The link mechanism also includes a movement restrictor arranged between the first and second transmitting portions. The movement restrictor includes a restricting surface formed in the lug plate and a restricted surface formed in the cam plate and restricts the first receiving surface to move away from the first transmitting surface in the rotational direction of the drive shaft in such a manner that the restricted surface comes into contact with the restricting surface.

Abstract: A variable displacement compressor has a housing, a drive shaft, a rotor, a swash plate, a piston and a decelerating mechanism. The housing includes a cylinder bore and supports the drive shaft. The rotor is secured to the drive shaft. The swash plate is operatively connected to the rotor and the drive shaft so as to rotate therewith and varies its inclination angle relative to the drive shaft. The piston is connected to the swash plate so as to reciprocate in the cylinder bore with rotation of the swash plate. A stroke of the piston varies in accordance with the inclination angle of the swash plate. The deceleration mechanism between the rotor and the swash plate decelerates the inclination speed of the swash plate in a range from a near maximum inclination angle to the maximum inclination angle when the swash plate inclines to increase the stroke of the piston.

Abstract: A compressor including a housing, a rotary shaft extending through the housing, and a sealing device arranged about the rotary shaft to seal the housing. A shaft bore extends through the housing for insertion of the rotary shaft. An elastomer lip ring seals the housing in cooperation with the rotary shaft, while contacting the peripheral surface of the rotary shaft in a slidable manner. A pressure resistant reinforcement arranged in the shaft includes a backup ring, which is arranged between the elastomer lip ring and the rotary shaft, and a stopper, which is fixed in the shaft bore. The backup ring contacts the elastomer lip ring. The stopper restricts movement of the backup ring in the axial direction relative to the rotary shaft and enables movement of the backup ring in a radial direction relative to the rotary shaft.

Abstract: A variable displacement compressor including a hinge mechanism that is easily machined. The hinge mechanism is arranged in the compressor between the lug plate and the cam plate. The hinge mechanism includes a support formed on the cam plate. A spherical projection extends from the support in a direction rearward with respect to the direction a drive shaft rotates. A roller extends from the support in a direction forward with respect to the direction the drive shaft rotates. A first cam is formed on the lug plate surrounding and guiding the spherical portion. A second cam is formed on the lug plate. The second cam includes a cam surface that contacts and guides the roller.

Abstract: A swash plate compressor that prevents a slide plate from being separated from a swash plate. The compressor includes a drive shaft. A slide plate is rotatable relative to the swash plate. Two shoes is arranged on the swash plate and the slide plate. A bearing arranged between the swash plate and the slide plate and in between the shoes. A piston is connected to the swash plate and the slide plate by the shoes and is reciprocated to compress gas. The swash plate includes a swash plate support surface, and the slide plate includes a slide plate support surface, in which each surface is for contacting the bearing. The swash plate is formed so that a clearance between the swash plate support surface and the slide plate support surface increases radially inwardly of the swash plate and the slide plate.

Abstract: A heat insulating structure in a piston type compressor includes a heat insulating member. The piston type compressor includes a cylinder block and a cover housing connected to the cylinder block, a piston is accommodated in a cylinder bore defined in the cylinder block to define a compression chamber. A suction pressure region and a discharge pressure region are defined in the cover housing. The piston is reciprocated in the cylinder bore in accordance with rotation of a rotary shaft so that refrigerant gas is drawn from the suction pressure region to the compression chamber and discharged from the compression chamber to the discharge pressure region. The heat insulating member has a predetermined shape and is located in the cylinder block. The heat insulating member has an inner peripheral surface that defines the cylinder bore.

Abstract: A controller for a variable displacement compressor that maintains high displacement while preventing excessive increase in discharge pressure. The controller includes a pressure sensing mechanism for detecting pressure of a suction pressure region in the compressor. A suction pressure controlling means controls the displacement of the compressor so that the pressure detected by the pressure sensing mechanism is converged to a predetermined suction pressure setting. A sensor detects pressure of a discharge pressure region in the compressor. A discharge pressure controlling means controls the displacement of the compressor so that the pressure detected by the sensor is converged to a predetermined discharge pressure setting. When the pressure detected by the sensor is greater than a threshold pressure, an ECU switches the control of the compressor from control with the suction pressure controlling means to control with the discharge pressure controlling means.