Abstract: A resin gear for an electric power steering apparatus is provided which offers excellent mechanical strength and durability, and in which damage of teeth, does not occur even when the gear is employed in an electric power steering apparatus equipped with a high-power electric actuator. The resin gear for an electric power steering apparatus includes a worm wheel, and a gear portion thereof is formed of a resin molding material containing a thermosetting resin and polyparaphenylene-benzobisoxazole fibers (PBO fibers) as essential constituents.

Abstract: Displacement data of axial position targets measured by axial displacement sensors is transmitted to a first main spindle elongation computation section, which then computes elongation of a main spindle between the axial position targets. The computation result is transmitted to a second main spindle elongation computation section, which then computes elongation of the main spindle between one of the axial position targets provided on the side of a tool and the tool. The computation result is transmitted to an axial position control section. The axial position control section changes the power to be supplied to axial magnetic bearing parts, thereby controlling the axial position of the main spindle so that the axial position of the tool becomes constant.

Abstract: In a vitrified bonded grinding wheel having superabrasive grains 11 such as CBN, diamond or the like bonded with a vitrified bond 12, pores 16 of the vitrified bonded grinding wheel has impregnated thereinto a resin 17 consisting of any resin selected from, e.g., unsaturated polyester, vinyl ester and allyl ester which are in a liquid state at the normal temperature and which have a thermosetting property, and being capable of radical polymerization. Thus, any separation gas or the like is not generated when the impregnated resin is hardened, whereby the strength of the grinding wheel can be enhanced.

Abstract: A bearing apparatus include a rotor having a flange portion, a foil bearing for supporting the rotor in a radial direction, and a magnetic bearing for supporting the rotor in an axial direction by an electromagnet, and a control portion for controlling electric current supplied to the electromagnet. The control portion controls such that a first electric current is supplied to the electromagnet so as to cause the electromagnet to attract the flange portion so as to support the rotor in the axial direction. The control portion also controls such that when the number of revolutions of the rotor is smaller than the number (R1) of revolutions at which the rotor floats off the foil bearing when supplying the first electric current to the electromagnet, a second electric current larger than the first electric current is supplied to the electromagnet.

Abstract: There are provided a high-order current distortion compensator which uses rotational position information on an electric motor and a target current value of the electric motor for deciding a compensation value for current high-order-component for canceling torque ripple caused by predetermined high-order components of a current flowing through the motor, and a correction portion which corrects the target current value by using the compensation value supplied from the high-order current distortion compensator. A feedback controller provides feedback control of the electric motor based on the target current value corrected by the correction portion. Thus is suppressed the torque ripple caused by the predetermined high-order components, whereby the degradation of steering feeling is reduced.

Abstract: A shock absorbing steering device for vehicle includes an intermediate shaft that couples a steering shaft and a steering gear. The intermediate shaft includes a hollow accordion portion allowed to undergo plastic deformation. The accordion portion has plural pairs of crest portions and trough portions disposed alternately in an axial direction. At least in a part of the accordion portion in the axial direction, a height from bottoms of the trough portions to apexes of the crest portions is set relatively high in one of first and second parts of the accordion portion opposing in a radial direction and relatively low in the other one of the first and second parts.

Abstract: The PLC according to this invention includes I/O modules, a CPU module, an input/output bus, and a PC having a display. The CPU module includes a control program storage unit which previously stores an intrinsic control program in which operation processing and an input/output information item are packaged; a library which previously stores the function block representing the operation processing; and a header file which previously stores equivalent input/output information equivalently representing the input/output information by a graphical language. Referring to the library and header file, PC causes the execution program created and stored in the main storage unit to be displayed on the display by the function block and equivalent input/output information item.

Abstract: A shock absorbing steering device for vehicle includes an intermediate shaft that couples a steering shaft and a steering gear. The intermediate shaft includes a hollow accordion portion allowed to undergo plastic deformation. The accordion portion has plural pairs of crest portions and trough portions disposed alternately in an axial direction. At least in a part of the accordion portion in the axial direction, a depth from apexes of the crest portions to bottoms of the trough portions includes a first depth corresponding to a part of the accordion portion in a circumferential direction and a second depth corresponding to a rest part of the accordion portion in the circumferential direction. The first depth and the second depth are different from each other.

Abstract: A magnetic bearing device includes a main shaft provided with a flange part extended in a radial direction, axial magnetic bearings which are arranged so as to be opposed to the flange part in an axial direction and support the main shaft in the axial direction by electromagnets, and an axial displacement sensor for detecting a position of the main shaft in the axial direction. The axial displacement sensor is characterized in that it is arranged so as to be opposed to the flange part in the radial direction.

Abstract: The micro computer 17 continue an output of a motor control signal to execute a current control to carry to each of two phases a phase current changing like a secant curve or a cosecant curve at making a predetermined rotational angle according to the phase generated the current-carrying failure as an asymptote at the generation of the current-carrying failure. The micro computer 17 provides a rotational angle compensating section 40 compensating an input rotational angle ? to correct a phase offset between a phase current command value Ix* as a current command value and an actual phase current value Ix as an actual current value in the current control.

Abstract: A telescopic shaft for steering vehicle includes: an inner shaft and a tubular outer shaft fitted with each other; at least three pairs of axial grooves formed on an outer periphery of the inner shaft and an inner periphery of the outer shaft; a rigid coupling element for rigidly connecting the inner shaft and the outer shaft in a circumferential direction of the inner shaft when a relative phase of the inner shaft and the outer shaft with respect to the circumferential direction exceeds a predetermined range; and a plurality of elongate resin rods as elastic coupling elements for elastically connecting the inner shaft and the outer shaft in the circumferential direction when the relative phase is in the predetermined range. Each of the plural resin rods is formed with a groove. A section of the groove is shaped like U opening toward the outside in a radial direction of the inner shaft.

Abstract: Preparation supporting software for sequence programs in a safety PLC capable of rewriting sequence programs, wherein the preparation supporting software for sequence programs judges whether or not an output section corresponding to an object sequence program is of the configuration ensured to be safe, based on input device kind information, which stores first kind information indicative of safety ensured or second kind information indicative of safety not ensured in correspondence to each input device, and the object sequence program, and displays the result of the judgment distinguishably.

Abstract: In a motor controller, in the case that occurrence of a failure of electric current flow is detected in any phase of a motor, a phase electric current command value changing in accordance with a secant curve or a cosecant curve with an asymptotic line at a predetermined rotation angle corresponding to the phase in which the failure of electric current flow has occurred is calculated. The calculated phase electric current command value is limited in such a manner as to become within a predetermined range. In the case that a rotation angle of the motor exists in a range in which the phase electric current command value is limited, the execution of an anomaly detection of a control system utilizing an electric current deviation of a d/q coordinate system is inhibited.

Abstract: It is provided that a grinding method of a rotating workpiece W having a cylindrical part and at least one end face beside the cylindrical part. The grinding wheel 30 has a rotational axis parallel to a rotational axis of the workpiece W and has an external surface 30FM, at least one side surface 30SM and at least one R-part 30KM between the external surface 30FM and the side surface 30DM. The grinding wheel 30 is moved backward in oblique direction to the end face to grind the end face for rough grinding in a process [1]. The grinding wheel is moved forward perpendicular to the rotational axis of the workpiece to grind the end face for finish grinding in a process [2a] and to grind the cylindrical part for rough grinding in a process [2b].

Abstract: A cross shaft member has four shaft portions arranged in a generally cross-shape around an outer periphery of a body portion thereof, and a recessed portion is formed in the body portion, and has a depth in a direction perpendicular to a plane in which axes of the four shaft portions lie. Four ridge-like thickened portions are formed in the recessed portion, and are equally spaced from one another, and extend diagonally with respect to the axes of the shaft portions in the plane.

Abstract: A rolling bearing apparatus is provided that rotatably supports a cam shaft in a cylinder head of an engine. The rolling bearing apparatus includes a plurality of rolling elements; a cage that positions the rolling elements so as to be spaced at regular intervals from each other in a circumferential direction and that retains the rolling elements in a freely rotatable manner; a shell-type outer ring configured to receive the rolling elements and the cage and having a raceway surface of the rolling elements at an inner side thereof; and an outer ring fastening member formed of a material having almost the same thermal expansion coefficient as the shell-type outer ring and having a press-fit portion press-fitted to the shell-type outer ring.

Abstract: A superconductive magnetic bearing 22 comprises a stationary bearing portion 23 having an annular superconductor unit 26 provided on a fixed portion 20, and a rotatable bearing portion 24 having annular permanent magnet units 28, 29 provided on a rotary portion 21 so as to be opposed to the superconductor unit 26. The rotary portion 21 is contactlessly supported relative to the fixed portion 20 by the pinning effect of a superconductor constituting the superconductor unit 26. The permanent magnet units 28, 29 each comprise a plurality of permanent magnet members arranged in superposed layers with an insulating layer provided between each adjacent pair of magnet members.

Abstract: A rolling bearing assembly includes: an outer member 10 possessing outer raceways 11, 12 on an inner periphery thereof; an inner member 20 possessing inner raceways 21, 22 formed on an outer periphery thereof and opposing the outer raceways 11, 12, and including a shaft body 3 of the bearing assembly; rolling elements 4 interposed between the inner raceways 21, 22 and the outer raceways 11, 12 in opposing relation; a wheel-mounting flange 5 disposed on an outer periphery of the outer member 10; and a brake rotor 7 mounted to the outer periphery of the outer member 10 without relying on the wheel-mounting flange 5 as allowed to move axially in a predetermined axial range relative to the outer member 10 but inhibited from moving circumferentially. Thus, the bearing assembly achieves unitization at reduced manufacture costs and is capable of effectively suppressing brake judder.

Abstract: A first pin of a connecting member of connecting a plurality of links to each other includes a front portion opposed to a corresponding second pin. The front portion is brought into rolling and sliding contact with the corresponding second pin at a contact portion displaced in accordance with a vibration in a bending angle between the links. A locus of moving the contact portion in accordance with bending the link forms an involute curve INV. A contact region of an end face of the first pin is brought into contact with a sheave face of a pulley by constituting a center by a contact center point. With regard to an orthogonal direction, a distance between a contact center point and a contact portion when the bending angle is zero and a distance between the contact center point and a contact portion when the bending angle is an allowable maximum bending angle are equal to each other.

Abstract: In a wheel spindle device wherein a plurality of grinding wheels are attached in a juxtaposed relation to a wheel spindle rotatably carried on a wheel head of a grinding machine, a reference position for specifying a position in the circumferential direction of the grinding wheel is provided on a core member of each of the grinding wheels, and a plurality of inclined grooves at predetermined angular intervals are formed on a grinding surface of each grinding wheel to be inclined relative to the circumferential direction of each grinding wheel. In order that the fluctuations in the dynamic pressure and the grinding resistance between respective grinding wheels and workpiece portions ground therewith do not grow as a combined or synergy effect, the inclined grooves on each grinding wheel are shifted in angular phase from those on another grinding wheel, so that grinding efficiency and accuracy can be enhanced.