Abstract: The variable displacement swash plate compressor includes a housing, a drive shaft, a swash plate, a piston, a bleed passage, a supply passage and a low-melting member. The housing has a cylinder bore, a suction chamber, a discharge chamber and a crank chamber. The swash plate is supported in the crank chamber by the drive shaft and inclination angle of the swash plate is adjustable. The piston is reciprocally movably received in the cylinder bore. The bleed passage is formed in the housing in communication with the crank chamber and the suction chamber. The supply passage is formed in the housing in communication with the discharge chamber and the crank chamber. The low-melting member is disposed in the bleed passage so as to restrict fluid flow therethrough and has a lower melting point than the housing. When the low-melting member is melted, an opening of the bleed passage is increased.

Abstract: A refrigerant circuit includes a linear electric compressor including a housing with a cylinder bore, a pair of end plates, a valve unit, a piston, an urging device for urging the piston, a coil generating electromagnetic force and a permanent magnet. The permanent magnet cooperates with the urging device and the coil to reciprocate the piston in the cylinder bore. The piston further includes a piston rod and the urging device is provided around the piston rod and a pair of piston heads integrally formed at opposite ends of the piston rod. The diameter of the piston rod is smaller than that of the piston head. The permanent magnet is provided on the piston head and the coil surrounds the piston head. The housing further includes a seat located between the pair of piston heads and the urging device is provided between the seat and each of the piston head.

Abstract: A compressor for use in a vehicle includes a mechanical compression mechanism including a first casing and a drive shaft. The first casing has therein a first suction chamber and a first discharge chamber. The drive shaft is rotatably supported by the first casing and mechanically driven by a drive source for compression of refrigerant. The compressor further includes a linear electric compression mechanism including a second casing and a piston. The second casing has therein a second suction chamber and a second discharge chamber. The piston is reciprocally movable in the second casing and driven by electromagnetic force for compression of refrigerant. The first casing is integrated with the second casing so as to allow at least one of fluid communication between the first suction chamber and the second suction chamber and between the first discharge chamber and the second discharge chamber.

Abstract: An electromagnetic clutch includes an external drive source, a driven apparatus having a rotary shaft, a power transmission path, first and second rotating parts, a power source, an electromagnetic coil and a power cutoff mechanism. A power transmission path is formed between the external drive source and the driven apparatus, and in which the first and the second rotating parts, the electromagnetic coil and the power cutoff mechanism are disposed. The first rotating part is driven to rotate by power from the external drive source. The second rotating part is mounted on the rotary shaft for rotation therewith. The electromagnetic coil is energized by electric current from the power source to generate electromagnetic attraction force by which the first and the second rotating parts are connected for transmitting power therebetween. The power cutoff mechanism stops excessive power transmission from the external drive source to the driven apparatus when the electromagnetic coil is energized.

Abstract: The present invention provides a lubricating oil composition for a compression type refrigerator, containing a base oil having a kinematic viscosity of 2 to 1,000 mm2/s at 40° C. The base oil contains the following compounds (1) to (6) each having a molecular weight of 150 to 5,000 and a tertiary or quaternary carbon: (1) an alicyclic hydrocarbon, (2) a branched carboxylic acid ester of a polyhydric alcohol, (3) an alicyclic polycarboxylic acid ester, (4) polybutene, (5) an alkyl benzene and/or an alkyl naphthalene, and (6) a paraffinic mineral oil showing a 13C-NMR spectrum in which an area of peaks at chemical shifts in the range of 30 to 100 ppm accounts for 5 to 40% of the entire peak area and/or a naphthenic mineral oil having a naphthene content of 30 to 70% by mass. The composition has excellent traction performance, lubricating properties and stability.

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 type compressor has a supply passage for supplying refrigerant gas to a pressure control chamber, a release passage for releasing the refrigerant gas from the pressure control chamber, a first control valve for controlling the amount of the refrigerant gas flowing through the supply passage, a check valve provided between the first control valve and the pressure control chamber and preventing the refrigerant gas from flowing from the pressure control chamber to the first control valve by closing the supply passage and a second control valve for adjusting a cross-sectional area of the release passage from minimum to maximum. The second control valve has a back pressure chamber communicating with the supply passage, a valve chamber forming a part of the release passage and communicating with a suction-pressure region, a valve hole forming a part of the release passage and communicating with the valve chamber and a spool having a valve portion located in the valve chamber.

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: An electromagnetic clutch includes a coil generating a first magnetic flux or a second magnetic flux depending on the direction of current flowing therein, a stationary core accommodating therein the coil, a stationary magnet providing a magnetic flux that opposes the first magnetic flux, a rotor rotatable concentrically with a rotatable shaft, a moving core fixed to the rotor, a moving magnet providing a magnetic flux that opposes the second magnetic flux, a sun gear fixed to the rotatable shaft, an internal gear fixed to the rotor, a planetary gear meshed with the sun gear and the internal gear, an arm supporting the planetary gear, a pulley rotatable concentrically with the rotatable shaft, a first armature being capable of coupling to the stationary core, and a second armature being capable of coupling to the moving core.

Abstract: A variable displacement type compressor in which a discharge-pressure region, a suction-pressure region and a pressure control chamber are defined, has a tiltable swash plate and a piston reciprocated by the swash plate in the pressure control chamber. The inclination angle of the swash plate and the piston stroke are changed by adjustment of pressure in the pressure control chamber thereby to control the displacement of the compressor. The compressor further comprises a supply passage for supplying refrigerant gas from the discharge-pressure region to the pressure control chamber, a release passage for releasing the refrigerant gas from the pressure control chamber to the suction-pressure region, a first control valve for adjusting a cross-sectional area of the supply passage from the discharge-pressure region to the pressure control chamber and a second control valve for adjusting cross-sectional area of the release passage.

Abstract: A swash plate type compressor has a housing assembly, a drive shaft, a swash plate, a piston, a motion converter, a bleed passage, and an oil separator. The housing assembly includes a cylinder bore, a suction chamber, a discharge chamber, and a crank chamber. The drive shaft is rotatably supported by the housing assembly, and extends through the crank chamber. The bleed passage communicates between the crank chamber and the suction chamber. The oil separator is disposed in the housing assembly. The oil separator separates no or less amount of lubricating oil from the refrigerant gas in the increased rotational speed of the drive shaft than that in the decreased rotational speed of the drive shaft. The refrigerant gas passed through the oil separator is introduced into the suction chamber, and the separated lubricating oil is returned to the crank chamber.

Abstract: The invention has its object to provide a swash plate compressor capable of realizing demonstration of an excellent sliding characteristic when a drive shaft is rotated at high speed, and of a high refrigerating capacity when the drive shaft is rotated at low speed. With the swash plate compressor of the invention, an oil guide groove, an oil guide hole, a first hole, an outflow hole, a valve hole, a communication port, a receiving chamber, a throttle hole, and a second hole constitute a release passage. The oil guide groove, the oil guide hole, the first hole, the outflow hole, the valve hole, the communication port, the receiving chamber, and the throttle hole constitute a first passage. Also, the second hole constitute a second passage. A valve mechanism increases a ratio, at which the first passage occupies the release passage, as a drive shaft is increased in rotating speed.

Abstract: An object of the invention is to provide a swash plate compressor capable of realizing an excellent sliding characteristic when a drive shaft is rotated at high speed, and a high refrigerating capacity when the drive shaft is rotated at low speed. The swash plate compressor according to the invention comprises an release passage for communication between a crank chamber and a suction chamber. The release passage includes a first passage communicated to an oil rich region, in which lubricating oil is large in quantity, in the crank chamber, and a second passage communicated to an oil poor region, in which lubricating oil is small in quantity, in the crank chamber. Also, the swash plate compressor comprises an valve mechanism that increases an opening ratio of the first passage with respect to the release passage, as a rotational speed of a drive shaft increases, and increases an opening ratio of the second passage with respect to the release passage, as the rotational speed of the drive shaft decreases.

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 suction structure allows refrigerant from a suction pressure region in a piston type compressor. The suction structure includes a shifting device, a bleed passage, and a check valve. The shifting device has a valve body, a return spring, a backpressure chamber, and a backpressure passage. The valve body is movable between a connecting position and a disconnecting position. The return spring urges the valve body from the connecting position toward the disconnecting position. The backpressure chamber is defined by the valve body. The backpressure passage communicates with the suction pressure region and the backpressure chamber. The bleed passage communicates with the suction pressure region and the backpressure chamber. The check valve allows a fluid to flow from the backpressure chamber into the bleed passage.

Abstract: A heat-insulating mechanism in a compressor which introduces refrigerant gas from a suction pressure region to a compression chamber and discharges the refrigerant gas from the compression chamber to a discharge pressure region has a circular passage, a communication passage, a cylindrical member and a passage heat-insulating member. The circular passage, which is a portion of the suction pressure region, has a circular cross-section, and is in communication with an external refrigerant circuit. The communication passage, which is a portion of the suction pressure region, intersects the circular passage for connection therewith, and is communicable with the compression chamber. The cylindrical member is fitted into the circular passage. The passage heat-insulating member made of an insulating material covers at least a portion of a passage wall surface which forms the communication passage.

Abstract: A suction structure is provided for allowing refrigerant into a suction pressure region in a fixed displacement piston type compressor. The compressor includes a rotary valve. The suction structure includes a shifting device which shifts between a connecting state and a disconnecting state. The shifting device includes a valve body, a return spring, a first and a second displacement chambers, and a throttle passage. The return spring urges the valve body from a connecting position toward a disconnecting position. The volume of the first displacement chamber is displacable in accordance with an amount of a fluid inside therein. The volume of the second displacement is displaced. The fluid is filled in the first and the second displacement chambers. The throttle passage connects the first displacement chamber to the second displacement chamber. The fluid flows through the throttle passage when the volume of the first displacement chamber is displaced.

Abstract: A capacity-variable type swash plate compressor in which the preferable operability of a link mechanism and reduction of manufacturing cost are realized is provided. According to the compressor in the present invention, a link mechanism includes one swash plate arm and intermediate arms. The intermediate arms include first and second intermediate arms. The first and second intermediate arms are joined while being rotatably supported by a lug member and the swash plate arm via a lug-side pin which constitutes a lug-side axis and a swash-plate-side pin which constitutes a swash-plate-side axis and clamping the lug member and the swash plate arm via the lug-side pin and the swash-plate-side pin so as to allow a sliding movement.

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 swash plate type compressor has a cylinder block, a drive shaft, a piston, a pair of first and second shoes and a swash plate. The swash plate has a first surface on the far side of the swash plate from the cylinder bore in slide contact with the first shoe and a second surface on the same side of the swash plate as the cylinder bore in slide contact with the second shoe. The swash plate has first and second edges formed between the first and second surfaces and an outer peripheral surface of the swash plate, respectively. The swash plate has a curved surface formed on the first edge at and adjacent to the bottom dead center of the swash plate whose radius of curvature is larger than that of the surface of the second edge.