Abstract: A piston type compressor has a housing, a crank chamber and a drive shaft supported by the housing. A front restriction and a rear restriction are located in the housing. The front and rear restrictions restrict axial movement of the drive shaft. The front restriction restricts forward movement of the drive shaft. The rear restriction restricts rearward axial movement of the drive shaft. A first clearance is located between the rear end of the drive shaft and the rear restriction when the drive shaft is restricted by the front restriction. A second clearance is formed between the piston and a valve plate when the drive shaft is restricted by the front restriction and when the piston is in the top dead center position. The first clearance is narrower than the second clearance. The method of assembly the piston easily sets the first clearance.

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 displacement control device comprises a control valve. The control valve controls the pressure in a crank chamber. The control valve includes a valve body, and an electromagnetic actuator. A power source supplies the current to the actuator. A switch device located between the actuator and the power source. A controller determines a target value of the current supplied to the actuator in accordance with an external condition. When the target value is changed to a new value, the controller controls the switching of the switch device such that the current is intermittently supplied from the power source to the actuator before the current is set to the new target value. This permits the displacement of the compressor to be smoothly and rapidly changed.

Abstract: A lip type seal (3A) has an annular casing (31), a plurality of seal lips (32, 34) and a rear surface support ring (35) arranged at the rear side. The casing (31) is installed to an inner circumferential surface of a seal installation part (1a) of a shaft hole housing (1) of an equipment through a main gasket (36) made of rubber state elastic material. An inner circumferential part of the seal lips (32, 34) is closely contacted with an outer circumferential surface of a rotary shaft (2). A sub-gasket (41) made of a material having a CO2 transmission coefficient being smaller than that of rubber material is interposed between the rear surface support ring (35) and the shaft hole housing (1).

Abstract: A compressor which has a housing defining therein a suction chamber, a discharge chamber and a crank chamber, a drive shaft rotatably supported in the housing, a first end of which penetrates through the suction chamber and protrudes from the housing, and a second end of which is disposed in the crank chamber, a single-headed piston accommodated in a cylinder formed in the housing, and a swash plate integrally rotatably mounted on the drive shaft and coupled with the piston. The cylinder is located between the crank chamber and the first end of the drive shaft so that pressure in the crank chamber acts on the drive shaft in an opposite direction of compressive reaction force acting on the drive shaft. A shaft seal is provided on the drive shaft between the suction chamber and the first end of the drive shaft in order to seal the suction chamber.

Abstract: An apparatus for winding a thread around a surface of an object while rotating the object. The apparatus includes a plurality of guide members. The guide members selectively guide a plurality of threads to the surface of the object. One guide member corresponds to one thread. The guide members move along the object. A moving device moves a selected one of the guide members.

Abstract: A variable displacement compressor is operated efficiently by avoiding inefficient conditions. The compressor varies its displacement using a control valve for which an external duty control procedure is performed. A target value for controlling the displacement is determined in accordance with the duty ratio Dt of a drive signal sent to the control valve. If the duty ratio Dt is equal to or greater than a predetermined reference value DJ, the displacement is permitted to be varied corresponding to the duty ratio Dt. If the duty ratio Dt is smaller than the reference value DJ, the variable displacement control through the duty control procedure is suspended. In this case, the compressor is operated with a nullified duty ratio (Dt=0), or a minimum displacement.

Abstract: An electric compressor includes a rotary shaft that is driven by an electric motor. The motor generates driving torque. Pistons compress gas in accordance with rotation of the rotary shaft. During one turn of the rotary shaft, the times when the net load torque generated by the pistons is minimum and the times when the driving torque of the motor is minimum occur at substantially the same rotation angles of the rotary shaft. Also, during one turn of the rotary shaft, the times when the net load torque is maximum and the times when the driving torque of the motor is maximum occur at substantially the same rotation angles of the rotary shaft. The driving torque is always greater than the net load torque. Therefore, the motor need not be large to generate sufficient torque.

Abstract: A shaft sealing assembly is located in a suction chamber of a swash plate type compressor to seal the space between a drive shaft and a housing. A first end portion of the drive shaft is supported by a first radial bearing. A second end portion of the drive shaft is supported by a second radial bearing. The suction chamber is closer to the first end portion of the drive shaft than the first radial bearing is. An axial passage is formed in the drive shaft to connect the suction chamber to the crank chamber. An inlet of the axial passage is closer to the second end portion than the second radial bearing is. An outlet of the axial passage is closer to the second end portion than the first radial bearing is.

Abstract: The present invention provides a piston type compressor in which vibration and noise due to interference between the piston and the cam plate can be suppressed by preventing the rotation of the piston, and at the same time, it is possible to improve the productivity and accomplish the cost down. According to the present invention, the piston type compressor comprises a housing including a crank chamber and a cylinder block. A cylinder bore is formed in the cylinder block. A piston is accommodated in the cylinder bore so as to reciprocate. The piston is operatively connected to the cam plate. The piston reciprocates accompanying with rotation of the drive shaft so that drawing and discharging of a refrigerant is performed. A rotation preventing portion is formed on the piston, and a groove facing the rotation preventing portion so as to have clearance is formed on an inner circumferential surface of the crank chamber.

Abstract: A method of producing a hollow piston for a compressor, the piston including a head portion which is slidably fitted in a cylinder bore of the compressor, and an engaging portion which engages a reciprocating drive device of the compressor for reciprocating the piston, at least the head portion of the piston being hollow, the method comprising a step of preparing at least one piston blank by forging, which piston blank includes an engaging-portion-forming section which provides the engaging portion of the piston, and a head-portion-forming section which provides at least a part of the head portion of the piston, the at least one piston blank being prepared by a two-axes forging process which uses a forging die assembly including a set of two first dies which are movable relative to each other along a first axis which is one of two mutually perpendicular axes, and at least one second die which is. movable along a second axis which is the other of the two mutually perpendicular axes.

Abstract: A hollow piston has an end wall that receives the pressure of a cylinder bore of a compressor. Several reinforcing ribs are formed on the inner end face of the end wall. The ribs extend radially from the axis of the piston. Therefore, the piston is light and strong.

Abstract: In a power module provided with a semiconductor integrated circuit containing a power element such as a power transistor, etc., a radiation plate for transmitting heat from a semiconductor chip which forms the semiconductor integrated circuit to a heat sink is made of ceramics. A conductive unit is obtained by saturating the upper portion of the ceramics with Cu (copper), Mg (magnesium), and Al (aluminum). A silicon chip 11 is attached to the conductive unit 13a with solder. The lower portion of the ceramics is attached to the heat sink 14 directly or through radiation grease 15. Thus, a resultant power module has a radiation structure with the number of units and the number of steps in an assembly process successfully decreased.

Abstract: In a pressure increasing type injector, a fuel pressure increasing chamber is communicated via a pressure relief passage, a recessed portion, a communication hole, a hollow portion and a bypass passage with a pressure release portion. A ball valve disposed within the recessed portion interrupts the communication between the recessed portion and the pressure relief passage at the start of fuel injection, and communicates the recessed portion with the pressure relief passage at the end of the fuel injection. Consequently, an injection ratio is increased gently at the start of the injection, and the fuel within the fuel pressure increasing chamber flows out therefrom to a pressure release portion when the valve is closed. Accordingly, an injection port can be closed rapidly and therefore the injection ratio is lowered abruptly.

Abstract: An electric compressor includes a compression mechanism, an electric motor and a housing. The compression mechanism draws, compresses and discharges refrigerant gas. The electric motor drives the compression mechanism. The housing accommodates the compression mechanism and the electric motor. A heat sink extends from the housing. An inverter is located in the housing. The inverter powers the electric motor. A heat sink cools the inverter. The heat sink is cooled by refrigerant gas. The heat generated by the inverter is therefore effectively reduced.

Abstract: A control valve used in a variable displacement compressor includes a valve chamber, a valve body and a pressure sensing chamber. A pressure sensing ball is movably located in the pressure sensing chamber and divides the pressure sensing chamber into a first pressure chamber and a second pressure chamber. First and second pressure monitoring points are located in a refrigerant circuit. The first pressure chamber is exposed to the pressure at the first pressure monitoring point. The second pressure chamber is exposed to the pressure at the second pressure monitoring point. The ball is displaced based on the pressure difference between the first pressure chamber and the second pressure chamber. The position of the valve body is determined based on the position of the pressure sensing member.

Abstract: In a variable-capacity swash-plate type compressor, which can vary the outlet capacity by controlling an inclination angle of a swash plate, the swash plate is aligned by contacting a washer (19) with a tapered surface to the swash plate (18). Thus, in a case where a compression operation is not carried out or in a case where a compression operation is carried out at a small outlet capacity regarded as zero substantially, the noises, etc., which generate between the swash plate and a driving shaft (6), are inhibited.

Abstract: A suction chamber and a discharge chamber are defined in a front housing member. A crank chamber is defined between a cylinder block and a rear housing member. A drive shaft passes through the suction chamber and extends from a front end of a housing. The drive shaft is supported by the housing. A shaft sealing assembly for sealing the drive shaft is located in the suction chamber. In the cylinder block and a valve plate, a bleed passage is formed for connecting the crank chamber with the suction chamber. The bleed passage is inclined downward toward the suction chamber. The outlet of the bleed passage is above the shaft sealing assembly. In the suction chamber, a reservoir, which stores lubricating oil supplied through the bleed passage, is surrounds a lower part of the shaft sealing assembly.