A first bleeding passage 50 configured to allow a crank chamber 2 and a suction chamber 31 to constantly communicate with each other, and a second bleeding passage 60 configured to allow the crank chamber 2 and the suction chamber 31 to constantly communicate with each other are provided. The first bleeding passage 50 is made to communicate with the crank chamber 2 at least via a space (central hole space 54) defined by an insertion end portion of a shaft 7 in a central hole 12 that is formed in the center of a cylinder block 1 and into which the shaft 7 is inserted. The second bleeding passage 60 is opened in an end surface 1a of the cylinder block 1 that is opposed to a swash plate 19.

A first bleeding passage 50 configured to allow a crank chamber 2 and a suction chamber 31 to constantly communicate with each other, and a second bleeding passage 60 configured to allow the crank chamber 2 and the suction chamber 31 to constantly communicate with each other are provided. The first bleeding passage 50 is made to communicate with the crank chamber 2 at least via a space (central hole space 54) defined by an insertion end portion of a shaft 7 in a central hole 12 that is formed in the center of a cylinder block 1 and into which the shaft 7 is inserted. The second bleeding passage 60 is opened in an end surface 1a of the cylinder block 1 that is opposed to a swash plate 19.

Provided are sampling pumps and gas analyzers using the sampling pumps. The sampling pump may include at least one reciprocating pump set and a control system. Each reciprocating pump set can include two reciprocating pumps. The control system can output drive signals for controlling reciprocating drawing and compressing operations of the reciprocating pumps, where the control system may be designed to output the drive signals that cause the two reciprocating pumps within the same set to provide opposing impact directions at the same time.

Provided are sampling pumps and gas analyzers using the sampling pumps. The sampling pump may include at least one reciprocating pump set and a control system. Each reciprocating pump set can include two reciprocating pumps. The control system can output drive signals for controlling reciprocating drawing and compressing operations of the reciprocating pumps, where the control system may be designed to output the drive signals that cause the two reciprocating pumps within the same set to provide opposing impact directions at the same time.

A variable displacement-type compressor for a vehicle includes: an electromagnetic clutch having a first electromagnetic coil; an electromagnetic control valve having an second electromagnetic coil; a first connector having an input terminal portion and an output terminal portion, the first connector being integrated with and electrically connected to one of the electromagnetic clutch and the electromagnetic control valve, and disposed at a position away from the other one of the electromagnetic clutch and the electromagnetic control valve, the input terminal portion being connectable to a vehicle-side connector, and the output terminal portion being electrically connectable to the other one; and a second connector provided separately from the other one, connected to the other one through a cable, and connected to the output terminal portion of the first connector.

A variable displacement-type compressor for a vehicle includes: an electromagnetic clutch having a first electromagnetic coil; an electromagnetic control valve having an second electromagnetic coil; a first connector having an input terminal portion and an output terminal portion, the first connector being integrated with and electrically connected to one of the electromagnetic clutch and the electromagnetic control valve, and disposed at a position away from the other one of the electromagnetic clutch and the electromagnetic control valve, the input terminal portion being connectable to a vehicle-side connector, and the output terminal portion being electrically connectable to the other one; and a second connector provided separately from the other one, connected to the other one through a cable, and connected to the output terminal portion of the first connector.

A boosting device is provided with a drive unit which is driven under the action of energization, and a boosting mechanism which is connected to the drive unit and which boosts and outputs a pressurized fluid. The boosting mechanism comprises a rotating body which is connected to a drive shaft of a drive source and includes a slope portion, and four pistons opposing the rotating body and disposed moveably in an axial direction. The pistons are sequentially and continuously pushed in the axial direction by means of the slope portion of the rotating body, whereby the pressurized fluid is compressed and boosted in a boosting chamber. The pressurized fluid that has been boosted in the boosting chamber is discharged out of an output port through a discharge passageway when an exhaust check valve is opened.

A boosting device is provided with a drive unit which is driven under the action of energization, and a boosting mechanism which is connected to the drive unit and which boosts and outputs a pressurized fluid. The boosting mechanism comprises a rotating body which is connected to a drive shaft of a drive source and includes a slope portion, and four pistons opposing the rotating body and disposed moveably in an axial direction. The pistons are sequentially and continuously pushed in the axial direction by means of the slope portion of the rotating body, whereby the pressurized fluid is compressed and boosted in a boosting chamber. The pressurized fluid that has been boosted in the boosting chamber is discharged out of an output port through a discharge passageway when an exhaust check valve is opened.

The present invention provides a method for producing a durable semispherical shoe which can be prevented from being subjected to seizure even in a dry lubrication state in which there is no lubricating oil at a start time of an operation of a swash plate compressor, can be restrained from deteriorating in its lubricating property due to generated frictional heat, and can be restrained from deteriorating in its strength at a production time and an injection molding die. A semispherical shoe (4), for a swash plate compressor, to be produced by the production method has a base material (5), consisting of a hard material, which has a hollow part along a central axis thereof and a resin layer, consisting of a resin composition, which is formed on a surface of a planar part, disposed on a periphery of the base member, which is to be subjected to sliding contact with the swash plate and on a surface of a spherical part, disposed on the periphery thereof, which is to be subjected to sliding contact with a piston. A resin-filled portion (8) where the resin composition is filled and an empty portion where the resin composition is not filled are formed in the hollow part of the base material. The resin-filled portion (8) and the resin layer are formed by injecting and filling the resin composition into a portion to be formed as the resin-filled portion (8) with the base material (5) being disposed inside a cavity (22) of the injection molding die.

The present invention provides a method for producing a durable semispherical shoe which can be prevented from being subjected to seizure even in a dry lubrication state in which there is no lubricating oil at a start time of an operation of a swash plate compressor, can be restrained from deteriorating in its lubricating property due to generated frictional heat, and can be restrained from deteriorating in its strength at a production time and an injection molding die. A semispherical shoe (4), for a swash plate compressor, to be produced by the production method has a base material (5), consisting of a hard material, which has a hollow part along a central axis thereof and a resin layer, consisting of a resin composition, which is formed on a surface of a planar part, disposed on a periphery of the base member, which is to be subjected to sliding contact with the swash plate and on a surface of a spherical part, disposed on the periphery thereof, which is to be subjected to sliding contact with a piston. A resin-filled portion (8) where the resin composition is filled and an empty portion where the resin composition is not filled are formed in the hollow part of the base material. The resin-filled portion (8) and the resin layer are formed by injecting and filling the resin composition into a portion to be formed as the resin-filled portion (8) with the base material (5) being disposed inside a cavity (22) of the injection molding die.