摘要:
An electronic control valve having a valve stationary portion defining a substantially central bore extending along an axis of the valve, and a valve train including a movable member of the valve. The valve train moveable member is disposed in the central bore, and the valve train is adapted for reciprocal movement along the axis. A mass is engaged is with the valve train and adapted for reciprocal movement along the axis. A biasing means is disposed between the valve train and the mass. Reciprocal movements of the mass along the axis induced by forces exerted along the axis by the valve train are transmitted through the biasing means, whereby reciprocal movement of the valve train along the axis is dynamically reduced by the mass.
摘要:
To prevent operation failure caused by adhesion of a lubricating oil of a control valve for controlling a discharge displacement. A partition member 150 is provided to partition a suction chamber 141 into: a first space 141a, to which a suction passage is connected, and in which a lubricating oil is separated from a refrigerant gas and is stored; and a second space 141b, to which a suction hole 103a is connected, and to which the refrigerant gas from which the lubricating oil that has been separated is introduced via a communication hole 150a, and it is configured so that a pressure in the second space 141b can be introduced to a control valve 300 via a pressure introducing passage 147.
摘要:
A control valve for a variable displacement compressor has a solenoid, a pressure sensing mechanism, and a valve mechanism. The solenoid has a first end and a second end and a cylindrical body. The pressure sensing mechanism is located on the first end of the solenoid. The pressure sensing mechanism has a pressure sensing chamber and a diaphragm. The diaphragm is displaced in accordance with the pressure in the pressure sensing chamber. The valve mechanism is located on the second end of the solenoid. The cylindrical body has a support end, which supports the diaphragm.
摘要:
A work vehicle with a hydrostatic steering system is disclosed which is capable of performing optimum control of the absorption torque of a hydraulic pump according to running load; capable of preferentially ensuring turning performance and implement speed when running load is relatively low; and capable of ensuring desired turning performance even when running load is relatively high. To this end, a bulldozer with a hydrostatic steering system, wherein the power of a hydraulic motor driven by pressure oil fed from a hydraulic pump operated by an engine is transmitted to right and left crawler tracks through a differential steering means composed of planetary gear trains etc., is designed to control the absorption torque of the hydraulic pump according to the speed ratio of a torque converter calculated by a speed ratio operation unit.
摘要:
To provide a control valve for a variable displacement compressor, including a plunger divided into separate members, which is improved in the attractive force characteristic and reduced in manufacturing costs. In a control valve for a variable displacement compressor, a predetermined space is formed between a holder and a small-diameter portion of a second plunger inserted into the holder, so that it is possible to reduce an attractive force acting in the radial direction of the second plunger during energization of a solenoid. On the other hand, opposed surfaces and 41a axially opposed to each other are formed on a large-diameter portion of the second plunger and the holder, respectively, and when the solenoid is energized, a magnetic circuit is formed via the opposed surfaces. This arrangement makes it possible to increase an attractive force in the operating direction of the second plunger. As a result, when the solenoid is energized, it is possible to relatively increase an attractive force in the valve-closing direction of a valve element connected to the second plunger to thereby enhance the attractive force characteristic of the whole control valve for a variable displacement compressor.
摘要:
A variable displacement compressor capable of controlling a piston stroke by openably controlling a displacement control valve to regulate a pressure in a crank chamber, comprising the displacement control valve disposed in a passageway from a discharge chamber to the crank chamber, and a fixed orifice provided in a passageway from the crank chamber to a suction chamber, the displacement control valve further comprising a pressure sensing member for the pressure in the suction chamber or the crank chamber, a valve element having a valve part opened and closed in response to the operation of the pressure sensing member, a valve chamber for disposing the valve part therein and allowing the pressure in the crank chamber to act therein, a partition wall disposed around the valve element, a pressure chamber partitioned from the valve chamber by the partition wall and allowing the pressure in the suction chamber to act therein, and a solenoid provided to the other end of the valve element, wherein a flow passage of non-contact structure is formed in the partition wall, and the number of sliding parts is reduced to lower a sliding resistance.
摘要:
A control valve for use in a variable capacity type compressor, the control valve includes a valve body (60); a valve (80); a solenoid magnetizing portion (70); and a pressure sensitive portion (86) comprising a pressure sensor (86a). The valve (80) is provided to have a large diametral portion (82a), and a neck portion (82) neighboring, through a step portion, to the large diametral portion. The valve body (60) is provided with a guiding hole (68) in which a circumferential wall portion of the large diametral portion (82a) is to be introduced and slidably moved. The step portion is provided with a plane (183) extending from the wall portion of the large diametral portion (82a) toward the neck portion (82) to a predetermined extent. The neck portion (82) is partially tapered to form a tapered portion (184). The large diametral portion (82a) is provided, in the vicinity of the step portion, with a groove or grooves (185).
摘要:
A capacity control valve is inserted in a flow path connecting a discharge chamber and a crank chamber of a variable capacity compressor and provided with a valve unit and a drive unit. The valve unit has a valve element for opening/closing the flow path or a valve passage of the valve unit. The drive unit has a movable core or plunger for driving the valve element and a communicating path that is formed in the plunger and connects chambers located in both sides of the plunger.
摘要:
A vehicular air conditioning refrigerant compressor is disclosed. The variable displacement compressor includes a suction chamber, a discharge chamber, a crank chamber, a drive shaft having rotated by a vehicle engine, a swash plate rotatable with the drive shaft and located within the crank chamber. The swash plate and the drive shaft have a tilt angle between them. The tilt angle is controlled by a control valve mechanism which regulates the introduction of a gas from the discharge chamber to the crank chamber. The compressor further includes a center sleeve slidably mounted on the drive shaft. The position of the center sleeve is responsive to the tilt angle. The compressor also includes a relief passage for relieving gas from the crank chamber to the suction chamber, and includes an axial hole in the drive shaft having an opening at one end of the drive shaft and an end within the drive shaft, a vertical hole in the drive shaft having two openings on the surface of the drive shaft and perpendicular to said axial hole. The vertical hole intersects the axial hole near the end of the axial hole. The relief passage further includes a passage in fluid connection with the suction chamber and the opening of the axial hole. The aperture of the two openings is regulated by the position of the center sleeve.
摘要:
A displacement control valve included in a variable displacement compressor. The compressor includes a fluid passage for connecting a crank chamber to a discharge chamber. The control valve includes a valve chamber connected to the crank chamber through the fluid passage, a valve hole connected to the discharge chamber through the fluid passage, and a valve body located in the valve chamber. A bellows influences the valve body through a pressure sensitive rod in accordance with suction pressure. A solenoid includes a fixed iron core and a plunger arranged in a plunger chamber. The plunger urges the valve body through a solenoid rod by a force determined by the level of electric current supplied to the solenoid. The fixed iron core, which is located between the valve chamber and the plunger chamber, includes a guide hole for receiving the solenoid rod. An annular passage for connecting the valve chamber to the plunger chamber is formed between the guide hole and the solenoid rod. Accordingly, the pressure of the crank chamber is applied to the plunger chamber through the valve chamber and the annular passage. In this control valve, the valve body has desirable operating characteristics without relying on parts having precise dimensions.