Abstract: In a method for setting a command-response characteristic of an oil pressure control apparatus for each oil temperature, the command-response characteristic actually measured at a reference oil temperature is treated as a reference I-P characteristic. Then, a stroke-response characteristic is calculated based on the reference I-P characteristic, a thrust-force correlation and a restoring-force correlation. An overlapping length and a clearance width of overlapping areas between a sleeve and a spool of the oil pressure control apparatus are estimated based on the reference I-P characteristic and the stroke-response characteristic. Finally, the command-response characteristics for each oil temperature are decided and set based on the overlapping length and the clearance width.

Abstract: Disclosed is a zirconium alloy material having high corrosion resistance regardless of thermal history during its manufacturing process. The zirconium alloy material is obtained by providing a zirconium alloy containing on the mass basis: 0.001% to 1.9% of Sn, 0.01% to 0.3% of Fe, 0.01% to 0.3% of Cr, 0.001% to 0.3% of Ni, 0.001% to 3.0% of Nb, 0.027% or less of C, 0.025% or less of N, 4.5% or less of Hf and 0.16% or less of O with the remainder being inevitable impurities and zirconium, being formed of a bulk alloy and a surface layer, in which the surface layer has a plastic strain of 3 or more or a Vickers hardness of 260 HV or more and an arithmetic mean surface roughness Ra of 0.2 ?m or less.

Abstract: A movable core sliding in a guide portion includes a small outer-diameter part, a large outer-diameter part, and a protrusion part. When a magnetic circuit is generated by energizing a coil, a magnetic attractive force inclining with respect to a center axis of the guide portion is generated between the guide portion and the movable core, and moves the movable core towards a stator core. Then, a sliding portion, which is provided over the whole periphery of the small outer-diameter part, and the protrusion part of the movable core are abutted on an inner peripheral surface of the guide portion, a clearance is generated between an outer peripheral surface of parts of the movable core except the protrusion part and the inner peripheral surface of the guide portion. Since the valve member can be opened by a small magnetic attractive force, a coil assembly can be made small.

Abstract: A guide portion slidably receiving a movable core is constructed by a medium-diameter portion, a first small-diameter portion, and a second small-diameter portion. A magnetism blocking portion is provided between the first small-diameter portion and the second small-diameter portion. A ring portion is provided at a periphery of the medium-diameter portion, and abuts on a yoke. When a coil is energized, a magnetic circuit is generated to pass through the yoke, the medium-diameter portion, the first small-diameter portion, the movable core, and the second small-diameter portion, and to bypass the magnetism blocking portion. In addition, another magnetic circuit passing through the ring portion is also generated. A magnetic attractive force inclining with a center axis of the guide portion is generated between the second small-diameter portion and an end surface according to an expansion magnetic circuit, and the movable core is moved towards the stator core.

Abstract: A guide portion slidably receiving a movable core is constructed by a large-diameter portion, a middle-diameter portion, a first small-diameter portion, a magnetism blocking portion, and a second small-diameter portion. A ring portion, which has an outer diameter greater than that of a coil assembly provided radially outside of the guide portion, is provided radially outside of the middle-diameter portion. When the guide portion attached with the coil assembly is attached to a support member corresponding to a mating member, the guide portion is attached to the support member by applying a rotational torque of to the ring portion in an axial direction of the guide portion according to a tool without an interference between the tool and the coil assembly. Therefore, an electromagnetic valve device for a gaseous fuel can be readily attached to the support member.

Abstract: A guide portion made of a magnetic material can be filled with a gaseous fuel of high-pressure and is slidably receiving a movable core. The guide portion is constructed by a first small-diameter portion, a second small-diameter portion, and a magnetism blocking portion having a wall thickness less than that of the first small-diameter portion and the second small-diameter portion. When a magnetic circuit is generated by energizing the coil, a magnetic flux passing through the first small-diameter portion passes through the second small-diameter portion via an end face of the movable core and generates a magnetic attractive force inclining with respect to a center axis. Therefore, the movable core is moved to the stator core by the magnetic attractive force adding a magnetic attractive force generated by a magnetic circuit.

Abstract: Provided is high corrosion resistant equipment for a plant having the lining structure which exhibits high reliability against breaking of a joining portion over a long use period. The high corrosion resistant equipment for a plant includes a lining plate and a support portion which are made of a high corrosion resistance material and a structural material portion made of a steel material or the like. The lining plate and the support portion include a joining portion to which friction stirring is applied. The support portion is assembled into or fastened to the structural material portion by means of the geometrical structure with a gap interposed between the support portion and the structural material portion. Due to such a constitution, high corrosion resistant equipment for a plant having the lining which exhibits high reliability can be acquired.

Abstract: Provided is high corrosion resistant equipment for a plant having the lining structure which exhibits high reliability against breaking of a joining portion over a long use period. The high corrosion resistant equipment for a plant includes a lining plate and a support portion which are made of a high corrosion resistance material and a structural material portion made of a steel material or the like. The lining plate and the support portion include a joining portion to which friction stirring is applied. The support portion is assembled into or fastened to the structural material portion by means of the geometrical structure with a gap interposed between the support portion and the structural material portion. Due to such a constitution, high corrosion resistant equipment for a plant having the lining which exhibits high reliability can be acquired.

Abstract: Disclosed is a zirconium alloy material having high corrosion resistance regardless of thermal history during its manufacturing process. The zirconium alloy material is obtained by providing a zirconium alloy containing on the mass basis: 0.001% to 1.9% of Sn, 0.01% to 0.3% of Fe, 0.01% to 0.3% of Cr, 0.001% to 0.3% of Ni, 0.001% to 3.0% of Nb, 0.027% or less of C, 0.025% or less of N, 4.5% or less of Hf and 0.16% or less of O with the remainder being inevitable impurities and zirconium, being formed of a bulk alloy and a surface layer, in which the surface layer has a plastic strain of 3 or more or a Vickers hardness of 260 HV or more and an arithmetic mean surface roughness Ra of 0.2 ?m or less.

Abstract: A linear solenoid includes a plunger to slide in an axis direction, and a stator core. The plunger includes a magnetic base, and a nonmagnetic plating layer defined on the magnetic base. The stator core has a first blocker arranged between a first magnetic core and a second magnetic core. The second magnetic core has a second blocker distanced from the first blocker in the axis direction. Each of the blockers limits a magnetic reaction. The plunger directly slides on an inner circumference face of the stator core at only two sections corresponding to the first and second blockers.

Abstract: A linear solenoid includes a plunger to slide in an axis direction, and a stator core. The plunger includes a magnetic base, and a nonmagnetic plating layer defined on the magnetic base. The stator core has a first blocker arranged between a first magnetic core and a second magnetic core. The second magnetic core has a second blocker distanced from the first blocker in the axis direction. Each of the blockers limits a magnetic reaction. The plunger directly slides on an inner circumference face of the stator core at only two sections corresponding to the first and second blockers.

Abstract: In an electromagnetic hydraulic pressure control valve of an N/L type, an electromagnetic actuator provides a force to a spool, which is slidably received in a valve housing, in a valve opening direction for opening an input port of the valve housing. A return spring provides a force to the spool in the valve closing direction. A constriction is provided to constrict a flow passage cross sectional area in a fluid passage, which extends from the input port to a hydraulic servo. A negative pressure port opens in a direction generally perpendicular to a flow direction of a fluid at a location, at which a fluid velocity of the fluid is accelerated by the constriction. A negative pressure guide passage communicates between the negative pressure port and a feedback chamber defined in the valve housing.

Abstract: A spool valve includes a valve housing, a spool and radial damper device. The valve housing has a shaft bore. The spool is slidably supported within the shaft bore in a longitudinal direction, and the spool has a first diameter portion and a second diameter portion. The radial damper device has a radial damper chamber and a radial chamber restrictor. The radial damper chamber is defined by a diameter difference between the first diameter portion and the second diameter portion. The radial chamber restrictor provides communication between the radial damper chamber and an adjacent chamber disposed adjacent to the radial damper chamber in the longitudinal direction.

Abstract: A linear actuator includes a coil that generates a magnetic force upon energization thereof, a yoke covering an outer peripheral surface of the coil, a magnetic attraction core that generates an attractive magnetic force in an axial direction with the magnetic force generated by the coil, a plunger that is magnetically attracted to the magnetic attraction core, and a magnetic conduct core that conducts magnetic flux received from the yoke to the plunger in a radial direction. An outer peripheral surface of the plunger is configured to slide along an inner peripheral surface of the magnetic conduct core. The plunger has a distribution-adjusting recess, which is recessed in an outer peripheral surface of a portion of the plunger made of a magnetic material to adjust magnetic flux distribution of the magnetic flux along the plunger in the axial direction with respect to the magnetic conduct core.

Abstract: An assist spring is provided between a plunger and a bottom wall of a yoke in order to bias the plunger forward. The assist spring has nonlinear characteristic to compensate a decrease in magnetic attracting force. In a range where the magnetic attracting force is weakened, the assist spring strongly biases the plunger forward and the plunger receives both of the magnetic attracting force and a biasing force of the assist spring. Therefore, a decrease in driving force of the plunger can be avoided.

Abstract: A plunger is axially intersectable with a tubular recessed portion formed in a magnetically attracting core of a stator core upon slide movement of the plunger, which places a predetermined portion of the plunger into the tubular recessed portion. A magnetic material in the predetermined portion of the plunger may have a predetermined outer diameter that is smaller than an outer diameter of the magnetic material in a slidably contacting portion of the plunger, which slidably contacts a slidable core of the stator core. Alternatively, a magnetic material in the tubular recessed portion may have a predetermined inner diameter that is larger than an inner diameter of the magnetic material in a slidably contacting portion of the slidable core, which slidably contacts the plunger.

Abstract: A shaft is placed through an axial through hole of an opposing magnetic portion of a slidable core and applies a displacement force of a plunger to a spool. The plunger has a plunger breathing hole that axially extends through the plunger along a center axis of the plunger. The shaft has a small diameter pipe portion, which is received in the plunger breathing hole, and a large diameter pipe portion, which has an inner diameter and an outer diameter that are larger than an inner diameter of the plunger breathing hole. A plunger front chamber and a plunger rear chamber are respectively defined on a front side and a rear side of the plunger and are communicated with a solenoid front chamber through an interior of the shaft.

Abstract: An oil pressure control device of the present invention is used for controlling oil pressure supplied to an automatic transmission device for an automotive vehicle. The oil pressure control device includes two or more spool valves driven by electromagnetic actuators. A spool forming the spool valve is slidably disposed in a cylindrical hole formed in a valve body. An oil-damper chamber is connected to an axial end of the cylindrical hole to suppress micro-vibrations of the spool caused by driving frequencies of the electromagnetic actuator. An oil-retaining space common to all the oil-damper chambers is formed in the valve case above the oil-damper chambers. Each oil-damper chamber is connected to the common oil-retaining space through an orifice. The oil-damper chamber and the orifice are filled with damper oil, and thereby the micro-vibrations of the spool are effectively suppressed.

Abstract: A solenoid includes a stator core, a plunger, a ring core, and a magnetic circuit component. The stator core has a fixed axial end and a free axial end. The free axial end is unfixed. The stator core is formed of a magnetic material. The plunger is slidable along an inner surface of the stator core. The plunger is formed of a magnetic material. The ring core surrounds an outer surface of the free axial end of the stator core. The ring core is formed of a magnetic material. The magnetic circuit component is adjacent to the stator core. The magnetic circuit component conducts magnetic flux with the stator core. The ring core radially conducts radial magnetic flux with the stator core. The ring core axially conducts axial magnetic flux with the magnetic circuit component.

Abstract: A spool valve includes a valve housing, a spool and radial damper device. The valve housing has a shaft bore. The spool is slidably supported within the shaft bore in a longitudinal direction, and the spool has a first diameter portion and a second diameter portion. The radial damper device has a radial damper chamber and a radial chamber restrictor. The radial damper chamber is defined by a diameter difference between the first diameter portion and the second diameter portion. The radial chamber restrictor provides communication between the radial damper chamber and an adjacent chamber disposed adjacent to the radial damper chamber in the longitudinal direction.