Abstract: A compressor has a suction chamber and a discharge chamber, and compresses refrigerant gas. The compressor includes a cover housing having an inner wall surface. The inner wall surface defines at least one of the suction chamber and the discharge chamber. A heat insulating member covers the inner wall surface. A flow restraining member restrains refrigerant gas from flowing between the heat insulating member and the inner wall surface. Hence, the adiabatic efficiency increases in at least one of the suction chamber and the discharge chamber within the compressor.

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 power transmission mechanism for transmitting driving power between a shaft and a rotor connected to the shaft includes a cylindrical adapter located between the shaft and the rotor and a screw seat arranged on the shaft. The adapter has a first internally threaded portion in its inner peripheral surface and a first externally threaded portion in its outer peripheral surface. The first internally threaded portion is engaged with a second externally threaded portion of the shaft, and the first externally threaded portion is engaged with a second internally threaded portion of the rotor. The screw seat has a screw seat surface. The adapter is screwed onto the shaft such that the adapter is pressed against the screw seat surface, and the rotor is screwed onto the adapter such that the rotor is pressed against the screw seat surface.

Abstract: A variable displacement type compressor circulates a refrigerant in an air conditioning circuit. The compressor has a compression mechanism and a displacement controller. The compression mechanism compresses and discharges the refrigerant. The displacement controller controls the discharge amount of the refrigerant of the compressor. The displacement controller further includes a normal control means and a protective control means. The normal control means controls the displacement based on a cooling load. The protective control means controls the displacement based on the value in connection with the rotational speed of the compressor and the actual operating information of the compressor.

Abstract: A single-headed piston for a swash plate type compressor including a head portion having an outer circumferential surface for sliding contact with an inner circumferential surface of a cylinder bore formed in a cylinder block of the compressor, and an engaging portion engaging a swash plate of the compressor, characterized in that; the outer circumferential surface of the head portion includes a cylindrical surface and a curved surface which is formed adjacent to at least one of opposite axial ends of the cylindrical surface, so as to smoothly extend from at least one circumferential part of the cylindrical surface, the curved surface being formed such that a radial distance between a centerline of the cylindrical surface and the curved surface gradually decreases in an axial direction of the cylindrical surface from the corresponding axial end of the cylindrical surface toward the corresponding axial end of the piston, and such that a radius of curvature of a cross sectional shape of the curved surface taken

Abstract: A piston for a compressor has a head portion, a neck portion, a receiving wall for receiving reactive force and a first guide wall. The receiving wall extends from a drive shaft side of the head portion towards the neck portion; is disposed on a preceding side in a rotating direction of a cam plate; and has an outer circumferential surface that slides over the inner circumferential surface of the cylinder bore. The first guide wall extends from the drive shaft side of the head portion towards the neck portion; is disposed on a following side in the rotating direction of the cam plate; and has an outer circumferential surface that slides relative to the inner circumferential surface of the cylinder bore. A recess is formed in the outer circumferential surface of the first guide wall.

Abstract: A variable displacement type compressor circulates a refrigerant in an air conditioning circuit. The compressor has a compression mechanism and a displacement controller. The compression mechanism compresses and discharges the refrigerant. The displacement controller controls the discharge amount of the refrigerant of the compressor. The displacement controller further includes a normal control means and a protective control means. The normal control means controls the displacement based on a cooling load. The protective control means controls the displacement based on the value in connection with the rotational speed of the compressor and the actual operating information of the compressor.

Abstract: A piston is used in a fluid machine. The fluid machine has a drive shaft and a cam plate operatively connected to the drive shaft. The drive shaft integrally rotates with the cam plate in a housing. The piston has a head portion, a neck portion, a receiving wall and a guide wall. The head portion is accommodated in a cylinder bore in the housing. The neck portion is operatively connected to the cam plate. The receiving wall integrally connects the head portion and the neck portion on the drive shaft side. The receiving wall is formed substantially on a preceding side in a rotating direction of the cam plate. The guide wall integrally connects the head portion and the neck portion on an opposite side of the drive shaft side. The guide wall is formed substantially on a following side in the rotating direction of the cam plate.

Abstract: A piston includes an engagement portion that engages with a swash plate. The engagement portion is provided with a pair of arm portions and a coupling portion for coupling base ends of the arm portions each other. An axial rib extending in the axial direction is integrally provided in a central part of a back surface of the coupling portion in the width direction orthogonal to a central axis of a head portion of the piston. An accommodation groove is formed on an inner circumferential surface of a cylinder bore corresponding to the axial rib, such that the axial rib does not interfere with the cylinder bore when the piston moves to the top dead center.

Abstract: A torque limiter to be operatively coupled to an engine is secured to the outer periphery of a driving shaft through screwing-engagement. The driving shaft and the torque limiter are screw-engaged and fixed to each other so that the torque limiter is pushed or urged against a seating face formed at the outer periphery of the driving shaft. The seating face abuts against the torque limiter restricting the screwing-movement of the driving shaft. Rotation force is transmitted between the driving shaft and the torque limiter via the seating face. A cylindrical member is disposed between the torque limiter and the seating face of the driving shaft. The cylindrical member is press-fitted and fixed to the outer periphery of the driving shaft, so that the power transmission between the driving shaft and the torque limiter is also performed through the press-fit portion between the cylindrical member and the driving shaft.

Abstract: A compressor includes a suction chamber and a discharge chamber in the housing. A first component is secured to a second component to form the housing. A first defining wall and a second defining wall are located in the second component to define the suction chamber and the discharge chamber. The second defining wall is located radially inward of the first defining wall. An inner fastener is located radially inward of the first defining wall and secures the first component to the second component.

Abstract: A hollow piston for use in a compressor includes a first piece and a second piece. The first piece has a skirt, which is to be engaged with a swash plate, and a cylindrical portion. The second piece is coupled to the first piece to cover an opening formed in one end of the cylindrical portion. A work includes a pair of the symmetrically arranged first pieces, which are coupled to each other at the skirts. The work is held against rotation about its axis and against axial movement. In this state, the second pieces are friction welded to the ends of the work. During friction welding, the second pieces are rotated in the opposite directions while being simultaneously pressed against the opened ends of the hollow cylindrical portions. As a result, deformation of the produced pistons is prevented.

Abstract: A method of producing a hollow piston for a compressor including a head and an engaging portion for engaging a piston reciprocating drive device, at least the head portion being hollow, the method comprising the steps of: forming a cylindrical body member having an open end at at least one of its opposite ends, and a closure member closing the open end of the body member, one of the body and closure members having an annular shoulder surface and a circumferential surface which is adjacent to the shoulder surface, the shoulder and circumferential surfaces defining a female corner portion, the other member having a male corner portion corresponding to the female corner portion; and fixing the body and closure members together for engagement of the male and female corner portions, and wherein the step of forming the body and closure members comprises at least one of (a) a step of forming an annular groove at a position of one of the shoulder and circumferential surfaces of the female corner portion, the position

Abstract: A compressor that reduces pressure pulsation includes a mounting member for attaching the compressor to a vehicle support. The mounting member is integrally formed with an end wall of a rear housing member. A suction chamber and a discharge chamber are defined in the rear housing member. The discharge chamber is located outside the suction chamber and surrounds the suction chamber. An auxiliary chamber is formed in the mounting member. The auxiliary chamber is centrally located. The auxiliary chamber increases the volume of the suction chamber, which reduces pulsation. Since the auxiliary chamber is formed in the mounting member, neither the weight or the volume of parts that might interfere with other devices is increased.

Abstract: A piston for a swash plate type compressor, including a head portion slidably fitted in a cylinder bore in a cylinder block of the compressor, a neck portion slidably engaging a swash plate of the compressor, and a connecting portion connecting the head and neck portions, wherein the head portion comprises a circular body portion, and an inner sliding projection extending toward the neck portion from a radially inner circumferential part of the body portion which corresponds to a radially inner portion of the cylinder block. The inner sliding projection has a sliding surface for sliding contact with an inner circumferential surface of the cylinder bore. The sliding surface is symmetrical with respect to a plane including centerlines of the piston and the cylinder block. The connecting portion connects the inner sliding projection and the neck portion.

Abstract: A hollow piston has an end wall that receives pressure in a cylinder bore of a compressor. A reinforcing protrusion is formed on the inner end face of the end wall. The contour of the protrusion, from the radially outside portion toward the radially inside portion, first approaches the outer end face and then departs from the outer end face. Therefore, the piston is light and strong.

Abstract: A piston for a swash plate type compressor, including a head portion slidably fitted in a cylinder bore formed in a cylinder block of the compressor, a neck portion slidably engaging a swash plate of the compressor, and a connecting portion connecting the head and neck portions, wherein the head portion has an inner surface which faces towards a centerline of the piston and which has at least one recess formed therein. Each recess is configured so as to accommodate a liquid when the piston is fitted in the cylinder bore.

Abstract: The object of the present invention is to offer not only a compressor which is compact and reduced in weight, but also its piston whose neck portion is increased in strength at a time.

Abstract: A hollow head portion of the piston is provided with a bottomed cylindrical portion and a cap closing an opening of the bottomed cylindrical portion. The cap is in the form of bottomed cylinder including a bottom wall, a cylindrical large diameter portion and a cylindrical small diameter portion. An outer circumferential surface of the small diameter portion is fitted to an inner circumferential surface of the cylinder portion of the bottomed cylindrical portion so that end faces are contacted with each other, and then these end faces are connected to each other by welding. A cap length, which is an axial distance from an apex surface of the cap to the end face thereof is set to be larger than a thickness of the bottom wall so that the welded portion is located far from a boundary portion between the bottom wall and the large diameter portion.

Abstract: A method of producing a hollow piston for a compressor, which includes a hollow cylindrical body member having an open end at at least one of its opposite ends, and a closure which closes the open end, the two members being welded together at respective welding surfaces, the method comprising the steps of: forming a first cutout in an outer surface of the cylindrical body member and a second cutout in an outer surface of the closure member, each of the first and second cutouts being located adjacent to a corresponding one of the welding surfaces of the two members, and extending in a circumferential direction of the cylindrical body member or the closure member along an edge of the corresponding welding surface, which edge is nearer to a corresponding one of the outer surfaces of the two members; fixing the two members together, so that the first and second cutouts define a groove having a bottom; and applying a welding beam to the bottom, so that the cylindrical body member and the closure member are bonded