Abstract: The magnetoelastic torque sensor includes a shaft that is magnetized in a first axial section in a first circumferential direction and to which a torque to be measured can be applied; a first magnetic field sensor outside of the shaft for recording a magnetic field, which is generated by the first section of the shaft and independent of the applied torque. The first magnetic field sensor comprises a first 3D Anisotropic MagnetoResistance (3D-AMR) sensor.

Abstract: A torque sensor for use in an electric power assisted steering system comprises a first shaft, a second shaft, and a torsion bar, a hollow sleeve that is secured to the first shaft and extends along the torsion bar to at least partially axially overlap the second shaft, angular deflection indicating means that produce a signal that is dependent on the angular deflection of the first shaft relative to the second shaft as a torque is applied across the torque sensor that causes the torsion bar to twist, at least one drive dog fixed to the sleeve and at least one corresponding drive dog fixed to the second shaft, in normal operation the two dogs being offset so that they permit a defined range of angular deflection of the torsion bar but will engage each other to provide a path for torque to be transferred from the first shaft to the second shaft in the event of a failure of the torsion bar, and a connecting element which has a first part that is secured within a bore in one of the second shaft and the sleeve, t

Abstract: A torque detecting apparatus includes a first shaft; a second shaft; an elastic member coaxially linking the first and second shafts; and a magnet attached to the first shaft; a pair of magnetic yokes composed of a first magnetic yoke and a second magnetic yoke, the first and second magnetic yokes being fixedly installed on the second shaft; and a magnetic sensor. Each magnetic yoke includes an opposing portion and a wall portion. The opposing portion is opposed to the magnet and displaced circumferentially relatively to the magnet when the elastic member is subjected to a torsional displacement. The wall portions of the first and second magnetic yokes are separated and positioned outside the opposing portions in the radial direction. The wall portions of the first and second magnetic yokes extend to be mutually opposed. The magnetic sensor is positioned between the wall portions.

Abstract: The present invention provides a rotational angle detection apparatus and a power steering apparatus capable of preventing or reducing distortion of a detection member and improving detection accuracy. A welded plate and a yoke holder are fixedly welded to each other with a pair of yokes sandwiched between the welded plate and the yoke holder.

Abstract: A copolymer in which from 45 to 60% by mass of all monomer units are unsaturated monomers having a specific carbosiloxane dendrimer structure is disclosed, along with a composition, a cosmetic raw material, and a cosmetic containing the copolymer. The copolymer has excellent physical properties, including compatibility with other cosmetic raw materials, e.g. hardly soluble ultraviolet absorbers, and is capable of improving the compounding stability of cosmetics. The copolymer imparts cosmetics with good water resistance, sebum resistance, luster, tactile sensation, and adhesiveness to the hair or skin.

Abstract: A torque detecting apparatus includes an annular magnetic flux collecting ring, a magnetic flux collecting holder surrounding and holding the magnetic flux collecting ring, and a magnetic shield including a circumferential end and attached to the outer periphery of the magnetic flux collecting holder. The magnetic flux collecting holder includes a housing portion that houses in its inner space the circumferential end of the magnetic shield. The housing portion includes an outer wall radially inwardly facing an outer peripheral surface of the circumferential end of the magnetic shield such that a first clearance is provided between the housing portion and the outer peripheral surface of the circumferential end of the magnetic shield.

Abstract: The present invention provides a torque sensor device disposed between an input shaft and an output shaft and configured to detect a torque between the input shaft and the output shaft through a relative rotation displacement therebetween.

Abstract: A rotation transmission device includes a one-way clutch which is provided between an output shaft of a speed increaser and an input shaft of a generator, which makes a connection between the output shaft and the input shaft to be rotatable integrally in a state in which a rotation speed of the output shaft is higher than that of the input shaft, and which cuts off the connection between the output shaft and the input shaft in a state in which the rotation speed of the output shaft is lower than that of the input shaft. The rotation transmission device further includes: a measurement section which measures a state of the one-way clutch which changes depending on a load exerted to the one-way clutch; and an acquisition section which acquires the load exerted to the one-way clutch on a basis of a measurement result of the measurement section.

Abstract: A torque sensor includes a pair of magnetic yokes arranged in a magnetic field from a multipolar magnet that rotates integrally with, for example, a first shaft, and the magnetic yokes rotate integrally with, for example, a second shaft. The torque sensor includes magnetic collecting elements magnetically coupled to the respective magnetic yokes and a magnetic flux detecting element. The magnetic collecting elements have a pair of magnetic collecting portions (magnetic collecting protrusions) facing each other. The magnetic flux detecting element includes a circuit board with a cutout formed therein and a Hall IC having a Hall element arranged between the magnetic collecting portions, and the Hall IC is mounted parallel to the circuit board so as to extend over the cutout. At least a part of one of the magnetic collecting portions is arranged in the cutout.

Abstract: An onboard detector includes a cable including an insulated wire including a center conductor and an insulation covering the center conductor and a sheath covering the insulated wire, a sensor including a sensor main body including a detecting element and a lead wire extending from the sensor main body and connected to the center conductor, and a fixing member to fix the sensor to the cable. The fixing member is configured to fix the insulated wire exposed from the sheath while being bent between the sheath and the lead wire. The insulated wire fixed while being bent allows the cable to be arranged such that an axial direction of the sheath inside the fixing member intersects with a direction parallel to a longitudinal direction of the lead wire.

Abstract: A magnetic torquer sensor for a steering system includes a magnetic unit, a magnetism-collecting unit, and a magnetic sensing element. The magnetic unit has a magnet ring. The magnetism-collecting unit has an inner magnetism-collecting ring and an outer magnetism-collecting ring. The inner magnetism-collecting ring has inner magnetism-collecting portions. The outer magnetism-collecting ring has outer magnetism-collecting portions. The outer magnetism-collecting portions and the inner magnetism-collecting portions are arranged alternately. The inner magnetism-collecting portions have their inner surfaces spaced from the magnet ring by a predetermined interval and level with inner surfaces of the outer magnetism-collecting portions. The magnetic sensing element is arranged at outer surfaces of the inner and outer magnetism-collecting rings for sensing magnetic-field variation between the inner and outer magnetism-collecting rings when they rotate with respect to the magnet ring.

Abstract: In an embodiment, a sensor substrate includes a first end, a second end, and a body. The body contains provisions for accommodating one or more sense elements. The first end and the second end contain attachment points for attaching the sensor substrate to a shaft. In addition, the first end and the second end include curved portions. For a particular end, a spacing of the attachment points and/or a depth of the curved portion may define, in part, a flexibility of the end. This flexibility may be used to control a sensitivity of the sense elements.

Abstract: A ball bearing for rotatably supporting a steering shaft, which is comprised of an input shaft and an output shaft connected to each other via a torsion bar is secured by a lock nut. The lock nut has an inside diameter Y1 greater than a maximum outside diameter X6 of the sensor body of a torque sensor mainly configured from a permanent magnet, first and second yoke members, and a magnetic sensor, which are disposed on the outer periphery of the steering shaft. With this configuration, the torque sensor and the lock nut radially overlap with each other, thus reducing the size of a device. Also, because of the lock nut being assembled so as to pass through the outer peripheral side of the torque sensor, component parts can be installed from one direction, thus improving the assembling workability of the device.

Abstract: A torque sensor includes a first magnet fixed to a first shaft, a tubular magnetic yoke assembly in which a magnetic yoke core is molded with a resin member, and a first magnetic sensor that detects a magnetic flux from the first magnet induced by the magnetic yoke core. The torque sensor also includes a collar made of a ferromagnetic body that is fixed to an inner circumference of the magnetic yoke assembly and to which a second shaft is press-fitted and fixed, and a second magnet for an index sensor that is disposed on an outer circumference of the magnetic yoke assembly. At least a part of the collar is disposed between the magnetic yoke core and the second magnet with respect to an axial direction of the magnetic yoke assembly.

Abstract: A powertrain incorporates a link shaft between the transmission output shaft and downstream components in order to facilitate use of a torque sensor. The link shaft includes an inner section splined to the output shaft and an outer section treated to produce a magnetic field that varies based on transmitted torque. The inner section and outer section are separated by a circumferential gap that directs the torque past the treated surface. Use of the link shaft eliminates the need to directly treat the transmission output shaft. Separating the spline and the treated surface radially reduces the axial length required for torque sensing and allows commonality among variants with and without torque sensors and between two wheel drive and four wheel drive variants.

Abstract: An electric power steering system includes a motor, rotation angle sensors, a determination unit, and a control unit. The determination unit determines whether each rotation angle sensor has a failure by one of determination methods depending on whether a situation is a first situation where one of the rotation angle sensors has a failure or a second situation where the rotation angle sensors have no failures. In the first situation, the control unit continues to control driving of the motor based on a rotation angle of the motor detected by a remaining rotation angle sensor having no failure. Only when determining, in the first situation, whether there is a failure in the remaining rotation angle sensor, the determination unit determines whether there is a failure based on whether a steering torque exhibits a specific behavior assumed to be detected when there is a failure in the remaining rotation angle sensor.

Abstract: A rotation detector includes a sensor element, a signal wire connected to the sensor element, the signal wire transmitting the rotation detecting signal, a sensor coating portion integrally coating the sensor element and an end of the signal wire connected to the sensor element, and a sensor attachment member at least supporting a part of the sensor coating portion and a part of the signal wire. The signal wire includes a curved portion. The sensor attachment member has a surface provided with depression portions. When the sensor attachment member is being molded, the depression portions are engaged with a pair of guide members which protrude toward the curved portion in a cavity of a molding die in a direction perpendicular to a surface including the curved portion, and the guide members protrude in directions opposite to each other.

Abstract: The present invention relates to a torque measuring device including a stator arranged at an inner surface of a case housing, a magnet distantly arranged with the stator at a predetermined gap, a sensing unit detecting a magnetic field generated between the stator and the magnet, and a non-magnetic stator holder integrally formed with a stator fixture fixed by the stator and a shaft fixture fixed by a shaft, whereby manufacturing cost of the torque measuring device can be minimized, and defects generated in the course of manufacturing process can be minimized.

Abstract: An electric power steering apparatus includes an input shaft to which steering force from a steering wheel is applied, an output shaft to which assisting force generated by an electric motor is applied, and a torque detection sleeve. One of the input shaft and the output shaft includes a cylindrical portion having a female stopper portion and a circumferential groove. The other of the input shaft and the output shaft has a male stopper portion being in concave-convex engagement with the female stopper portion and relatively rotatable in a given angular range. An edge of a base end portion of the torque detection sleeve is clinched to the circumferential groove. The circumferential groove is provided on a portion of an outer peripheral surface of the cylindrical portion radially overlapping a stopper engagement region in which the female stopper portion and the male stopper portion are engaged with each other.

Abstract: A yoke unit includes a first yoke, a second yoke, and a resin section. The first yoke includes multiple first magnetic pole teeth. The second yoke includes multiple second magnetic pole teeth. The first magnetic pole teeth and the second magnetic pole teeth are arranged alternately. The resin section makes the yokes integral with each other. The resin section includes a recessed part formed in an inner surface of the resin section. The recessed part is arranged between the first magnetic pole tooth and the second magnetic pole tooth.

Abstract: A measuring device for steering wheel torque includes a magnetic sensor to measure a rotational torque of the steering wheel. The measuring device for steering wheel torque has the advantages of high measuring precision, non-contact, high reliability and low cost.

Abstract: A torque detector includes: a magnetic flux collecting unit including a magnetic flux collecting holder formed in an annular shape by resin molding and a magnetic shield formed by bending a metal plate and attached to an outer peripheral face of the magnetic flux collecting holder; and a sensor housing formed integrally with the magnetic flux collecting unit. The magnetic shield has a shield body, a shield end portion, and a bent portion. A second angle formed between an outer side face of the shield end portion and a radial direction is smaller than a first angle formed between an outer peripheral face of the shield body and the radial direction.

Abstract: A wheel bearing apparatus has an outer member, an inner member and double row rolling elements. A coupler ring is fit onto the wheel hub. The coupler ring inner circumferential splined portion has a plurality of spline recesses and spline projections. The plurality recesses and projections mate with a hub splined portion formed on the inner side outer circumference of the cylindrical portion of the wheel hub. An axial cross-section of the inner-side end of each spline projection of the hub splined portion is formed by a single circular arc with a predetermined radius of curvature “R”. The radius of curvature “R” is larger than a dimension “A”, measured from the inner-side end face of the coupler ring to the inner-side edge “B” of each spline projection (R>A). Also, it is larger than the height “h” of each spline projection (R>h).

Abstract: Torque sensor has: magnetic member; first yoke member having (a) first nail portions arranged concentrically to face the magnetic member in radial direction and (b) first ring portion; second yoke member having (c) second nail portions arranged concentrically so that the first and second nail portions are circumferentially alternately arranged and the second nail portions face the magnetic member in radial direction and (d) second ring portion; first magnetic flux concentration ring provided between the first and second ring portions; second magnetic flux concentration ring provided between the second ring portion and the first magnetic flux concentration ring; and magnetic sensor. The first and second magnetic flux concentration rings and the first and second ring portions are arranged in layers in radial direction. A part or all of axial direction area of the first and second magnetic flux concentration rings is surrounded and shielded by the second ring portion.

Abstract: The invention relates to a sensor arrangement (2) for capturing a torque acting on a shaft (14), wherein the sensor arrangement (2) comprises a sensor unit (4) with a sleeve (34), on which at least one sliding element and at least one first sensor which is sensitive to magnetic fields are arranged, and a magnetic-flux unit (6) with two magnetic flux-conducting rings (28, 30), wherein the at least one sliding element is arranged between the magnetic flux-conducting rings (28, 30), wherein the sensor unit and the magnetic-flux unit (6) are rotated relative to one another during a rotation of the shaft (14), and wherein the at least one sensor which is sensitive to magnetic fields captures a magnetic flux conducted by the rings (28, 30).

Abstract: A torque sensor includes an output shaft, and a stator holder into which the output shaft is inserted and coupled. A second coupling piece is connected to the stator holder and configured to come in contact with an outer surface of the output shaft. A through-hole is formed in the second coupling piece in a circumferential direction, and a second hog ring is disposed in the through-hole to contract the second coupling piece in a central direction.

Abstract: An electric power steering apparatus has a first rolling bearing and a second rolling bearing rotatably supporting an output shaft. The first rolling bearing is provided between an inner peripheral surface of a through-hole of a gear housing and an outer peripheral surface of the output shaft. The second rolling bearing is provided between an inner peripheral surface of an intermediate plate press-fitted and fixed in an opening portion of the gear housing and the outer peripheral surface of the output shaft. An outer peripheral portion of the intermediate plate has alternately arranged large diameter portions and small diameter portions, and the large diameter portions are press-fitted in the gear housing.

Abstract: An electrical power assisted steering device has a lower shaft, an upper shaft module, a pre-torsion module and a torsion bar. The upper shaft module has an upper shaft, a detecting unit mounted around the upper shaft, and an assembling space annularly formed between the detecting unit and the pushing portions. The pre-torsion module is mounted in the assembling space and has a maintaining unit mounted around the upper shaft and in the assembling space, multiple sliding blocks mounted in the maintaining unit and respectively abutting the upper shaft, and multiple springs mounted in the maintaining unit and respectively abutting between the maintaining unit and the sliding blocks. The torsion bar is connected between the upper shaft and the lower shaft.

Abstract: A magnetostrictive torque sensor includes first to fourth detection coils each wound around a steering axle (a sensor shaft) so as to surround a magnetostrictive film formed on the sensor shaft and a multi-turn winding bias coil that is separated from the first to fourth detection coils and that is wound around the sensor shaft so as to surround the magnetostrictive film. By applying a DC component current to the bias coil, a sufficient bias magnetic field is applied to the magnetostrictive film so that the hysteresis is prevented.

Abstract: A method and apparatus for controlling an electrically power-assisted steering device for vehicles including a control unit providing control information to a steering device. The method and apparatus includes a setpoint signal value transmitter providing setpoint value information and obtaining actual value information from the steering device. The actual value information is fed to the setpoint signal value transmitter and a difference value information is obtained from the setpoint value information and actual value information with the difference value information fed to the control unit. A filter unit filters information components from one of the actual value information provided, the actual value information fed to the setpoint signal value transmitter, the setpoint value information or the difference value information.

Abstract: A sensor unit includes a printed circuit board, a Hall IC, a terminal member, and a capacitor. The printed circuit board has a conductive pattern. The Hall IC is disposed on the printed circuit board. The Hall IC includes an element part that detects magnetic flux. The element part is arranged in parallel with the printed circuit board and is away from the conductive pattern. The terminal member is disposed on an end portion of the printed circuit board and is configured to be electrically coupled with an external device. The capacitor is disposed on the printed circuit board.

Abstract: Disclosed is a torque index sensor, the sensor including a housing, a stator mounted at a space inside the housing, a magnet arranged inside the stator to rotate with a rotation shaft, a PCB (Printed Circuit Board) fixedly mounted inside the housing and mounted with a first magnetic element outputting a magnetization signal in response to rotation of the magnet, at least one or more fixing bosses protrusively formed at the housing, and a collector having a plurality of through holes penetratively formed at a position corresponding to that of the fixing boss and concentrating a magnetic field for guiding a magnetic flux of the magnet, wherein the fixing boss is thermally fused after passing the through hole to tightly fix the collector at an inner surface of the housing.

Abstract: The rotation-angle and torsion sensor has two gears that are connected so as not to turn with shaft sections, which [gears] mesh with gears. On one of the gears a unipolar or multipolar magnet is attached. On the other gear, magnetic flux guides matching to number of poles are attached, that are configured as L shapes. One leg of the flux tranducers points in the direction of the multipolar magnet while the other legs run parallel to the gear and in fact one on one side and the other on the other side of the gear, with these legs enclosing a second sensor between them that is situated in the gear.

Abstract: A torque detection device includes: a magnetic flux collecting unit that includes an annular holder formed by resin molding and having a through-hole that passes through the holder in a radial direction, a first magnetic flux collecting ring and a second magnetic flux collecting ring that are fitted to an inner periphery of the holder so as not to cover the through-hole, and a magnetic shield that is fitted to an outer periphery of the holder so as to cover the through-hole; and a sensor housing that is made of resin supplied onto an outer periphery of the magnetic flux collecting unit, and that is formed so as to be integrated with the magnetic flux collecting unit.

Abstract: A magnetic torque sensing device having a disk-shaped member with a magnetoelastically active region. The magnetoelastically active region has oppositely polarized magnetically conditioned regions with initial directions of magnetization that are perpendicular to the sensitive directions of magnetic field sensor pairs placed proximate to the magnetically active region. Magnetic field sensors are specially positioned in relation to the disk-shaped member to accurately measure torque while providing improved RSU performance and reducing the detrimental effects of compassing.

Abstract: A torsion bar has first and second end portions that are fixed to input and output shafts, respectively, to coaxially connect between the input and output shafts. A multipolar magnet is fixed to the input shaft. First and second magnetic yokes are fixed to the output shaft. Magnetic sensors are held between magnetic flux collecting portions of first and second magnetic flux collecting rings, which are magnetically coupled to the first and second magnetic yokes, respectively. In each of the magnetic flux collecting portion, a connecting section and a mounting section are configured such that a width of the connecting section is smaller than a width of the mounting section.

Abstract: A gear position sensor employs a sliding electrical connection between arcuate conductors and flexible wiper arms held on opposite surfaces that rotate relative to each other with the movement of a gear selector shaft. The traces may have multiple segments joined by resistors to provide flexible change in resistance value and resistance range for different applications.

Abstract: A rotation angle detecting unit includes an IC package having a magnetism detecting element, a sealing body, and leads; and a covering member having a fixing part and a supporting part, which are integrally formed from resin. The element outputs a signal according to change of a magnetic field generated upon rotation of a magnetism generating device attached to a detection object. The sealing body covers the element. The leads are connected to the element, and project from the sealing body. The fixing part is fixed to a supporting body so that the covering member is attached to the supporting body. The supporting part supports the package such that the element can output the signal. The package is press-fitted into the supporting part after its formation, so that the package is supported by the supporting part with a predetermined pressure applied to part of an outer wall of the sealing body.

Abstract: To provide a method which can define the direction and orientation of magnetization of a pinned layer while reducing the number of steps of forming a GMR film. The magnetization direction of the pinned layer is defined in a plurality of directions by forming a plurality of patterns having directivities. Further, when the magneto-resistive effect film is formed, a magnetic field is applied in a direction at an angle set between the angles of the plurality of patterns.

Abstract: There is provided a torque detecting device for providing a highly accurate torque signal, and an electric power steering device using the torque detecting device. A torque sensor is provided with a first coil pair and a second coil pair, which detect a relative displacement between an input shaft and an output shaft by corresponding the relative displacement to a change in impedance. Magnetization signal generating units supply exciting currents with different magnetization frequencies to the first coil pair and a second coil pair, respectively. The magnetization frequency difference is set to 3.5 kHz or higher. Moreover, low-pass filters for intercepting passage of a frequency equivalent to the magnetization frequency difference are deployed in signal processing circuits respectively.

Abstract: Magnetic position sensors, systems and methods are disclosed. In an embodiment, a position sensing system includes a magnetic field source with a dipole moment in a direction along a z-axis; and a sensor module spaced apart from a center of the dipole moment a distance y0 along a y-axis and spaced apart a distance z0 from a center of the dipole moment along a z-axis, at least one of the magnetic field source or the sensor module configured to move relative to the other along a path in the y=y0 plane, the sensor module configured to determine a relative position of the magnetic field source to the sensor module with respect to the path from a ratio of a gradient dBz/dx to a gradient dBz/dy, where Bz is a magnetic field component associated with the permanent magnet, and where an x-axis, the y-axis and the z-axis are at right angles.

Abstract: An excitation AC signal biased by a predetermined DC voltage is applied to a coil to allow a DC voltage component in a coil output signal to contain failure information about disconnection, partial disconnection, or the like of the coil. The DC voltage component contained in the coil output signal is detected, and the detected DC voltage is provided as an offset voltage for a failure diagnosis. Further, to check a peak level of the excitation AC voltage, a DC voltage corresponding to the peak level may be contained in the offset voltage. A differential amplifier circuit for obtaining a difference between a coil detection output AC voltage component and a reference AC voltage component outputs an obtained differential signal offset by the offset voltage. Accordingly, the differential signal containing the offset voltage as the failure information is transmitted to a circuit for torque measurement as a torque detection signal via a single output line.

Abstract: The present invention provides a single component implementing highly precise pulse detection for rotational or liner position detecting apparatuses for jog dials and mechanical products. Focusing on the fact that the phase difference between the magnetic fields in circumferential and radial directions generated by a magnetized ring is precisely 90 degrees, a position detecting apparatus of the present invention includes two Hall elements placed at a distance; a protective film provided on magnetic sensitive portions of the two Hall elements to cover the magnetic sensitive portions; a thin-film magnetic plate placed on the protective film to cover the magnetic sensitive portions of the two Hall elements; and further a processing circuit calculating the sum and difference of the signals from the two Hall elements to generate signals having an accurate phase difference of 90 degrees. The position detecting apparatus can therefore detect the rotation direction and precise rotation angle.

Abstract: A first excitation AC signal (V1=A1·sin(?t)) is supplied to a first excitation coil of a first resolver via a first excitation line, and a second excitation AC signal (V2=?A2·sin(?t)) is supplied to a second excitation coil of a second resolver via a second excitation line. Within a resolver unit, a first excitation line and a second excitation line are connected via an electric resistance element. By virtue of this configuration, torque can be detected even when any of a ground line, a first excitation line, and a second excitation line of a wire harness is broken.

Abstract: A magnetic torque sensing device having a disk-shaped member with a magnetoelastically active region. The magnetoelastically active region has a magnetically conditioned region with an initial direction of magnetization that is perpendicular to the sensitive directions of magnetic field sensor pairs placed proximate to the magnetically active region. Magnetic field sensors are specially positioned in relation to the disk-shaped member to accurately measure torque while providing improved RSU performance and reducing the detrimental effects of compassing.

Abstract: A rotation angle detection device includes: a detection portion that detects detection angle that univocally corresponds to rotation angle of a rotating body which is within a predetermined range, wherein the detection angle linearly increases from a minimum value to a maximum value as the rotation angle increases within a unit range, and the detection angle changes from the maximum value to the minimum value or from the minimum value to the maximum value at a boundary between unit ranges that are adjacent to each other; and a correction portion that corrects the detection angle so that the detection angle detected in the predetermined range has linear characteristics, if the boundary between the unit ranges is contained in the predetermined range.

Abstract: A magnetostrictive torque sensor device which detects a torque applied to a rotary shaft is provided. The magnetostrictive torque sensor device includes a magnetostrictive portion provided on a surface of the rotary shaft, a coil and a cylindrical back-yoke disposed in outer periphery of the coil. The coil includes a bobbin arranged in outer periphery of the magnetostrictive portion, and a wire wound around the bobbin. A slit is provided on the back-yoke.

Abstract: The present invention involves a method and apparatus for canceling the effects of magnetic field noise in a torque sensor by placing three sets of magnetic field sensors around a shaft, the first set of field sensors being placed in the central region of the shaft and the second and third sets of field sensors being placed on the right side and left side of the field sensors placed at the central region, respectively. A torque-induced magnetic field is not cancelled with this arrangement of field sensors but a magnetic near field from a near field source is cancelled.

Abstract: A torque detection device includes: a magnetic flux collecting unit that includes an annular holder formed by resin molding and having a through-hole that passes through the holder in a radial direction, a first magnetic flux collecting ring and a second magnetic flux collecting ring that are fitted to an inner periphery of the holder so as not to cover the through-hole, and a magnetic shield that is fitted to an outer periphery of the holder so as to cover the through-hole; and a sensor housing that is made of resin supplied onto an outer periphery of the magnetic flux collecting unit, and that is formed so as to be integrated with the magnetic flux collecting unit.

Abstract: A method produces a magnetostrictive torque sensor which detects a steering torque applied to a steering shaft by electrically detecting distortion of magnetostrictive films provided on a surface of the steering shaft. A plating step forms the magnetostrictive film on the surface of the steering shaft, and a heat treatment step heat treats the magnetostrictive film on the steering shaft. During the heat treatment step, hydrogen in the magnetostrictive film is decreased so that a hydrogen desorbing peak around 120° C. disappears when the magnetostrictive film is heated after the heat treatment step.