Abstract: A torque sensor includes input and output axes coupled through a torsion bar, magnetic media attached to the input and output axes and having magnetic tracks magnetized at a predetermined pitch and magnetic detection elements disposed opposite to the magnetic media to be sensitive to the magnetic tracks. At least two magnetic tracks for detection of torque are formed with a magnetic phase difference in each of the magnetic media attached to the input and output axes.

Abstract: A torque detecting device includes an elastic member disposed between an input shaft and an output shaft of a torque transmitting apparatus, first and second resolvers detecting rotational angles of the elastic member at sides of the input shaft and the output shaft. The first resolver includes a first excitation winding coil and a first output winding coil, and the second resolver includes a second excitation winding coil and a second output winding coil. The first and second excitation winding coils are connected to a ground, and the first and second output winding coils are connected to the other ground.

Abstract: A rotation sensor provided with a first rotor fixed to a shaft, a second rotor fixed to the same or other shaft and adjoining the first rotor, and a core having a resonance coil, arranged around the first rotor, and which coil forms a magnetic circuit working with the first rotor. The first rotor is formed of a magnetic material comprising an insulator; an irregular magnetic field is formed with the core; and the second rotor is provided with a conductor cutting across areas of different intensities of the irregular magnetic field in accordance with the difference of the angle of rotation when a difference in the angle of relative rotation occurs at a shaft position where the first rotor is fixed and at a shaft position where the second rotor is fixed.

Abstract: A torque sensor includes first and second shafts, an elastic shaft, a magnet, a pair of ring plates, and a magnetic sensor. The elastic shaft connects the first and second shafts coaxially. The magnet is fixed to the first shaft. The pair of ring plates is fixed to the second shaft, and faces each other in an axial direction of the elastic shaft so that the pair of ring plates sandwiches the magnet. The magnetic sensor is disposed in a gap between the pair of ring plates so that the magnetic sensor detects a magnetic flux density in the gap. Each ring plate includes a convexity and a concavity in an inner circumference of each ring plate, respectively. The pair of ring plates is rotatable against the magnet in accordance with a twist of the elastic shaft so that the rotation of the ring plates causes the magnetic flux density in the gap.

Abstract: A torque sensing device includes a housing, an input shaft, and a pinion shaft. A torsion bar interconnects and allows rotation of the shafts relative to one another. The shafts are supported to allow axial movement within the housing. A plurality of magnets are spaced radially about the input shaft, and a stator assembly mounted to the pinion shaft extend axially over the magnets. A pair of flux rings is supported by the housing and extend annularly around the stator assembly at a radial distance from the stator assembly. Each one of a pair of flux brushes is magnetically proximal to one of the flux rings. The flux brushes are spaced apart from one another by a gap. A pair of sensors within the gap measures the direction and magnitude of a magnetic flux passing between the flux brushes.

Abstract: An outer cylindrical section is rotatable with a first shaft. Magnetic shielding portions are formed of a magnetic shielding or antimagnetic substance and arranged on a surface of a nonmagnetic and nonconductive cylindrical base. The magnetic shielding portions are spaced apart from each other by a predetermined interval in a circumferential direction of the cylindrical base so that non-magnetically-shielding portions are formed between the magnetic shielding portions. A plurality of coils are provided on a periphery of the outer cylindrical section and excitable by a predetermined A.C. signal. An inner cylindrical section is inserted in the outer cylindrical section and rotatable with a second shaft. The inner cylindrical section includes magnetic portions each provided to present a different characteristic with respect to an arrangement of the plurality of coils.

Abstract: A torque sensor is provided with a coil whose inductance changes in accordance with variation in torque acting on an object. The torque is detected on the basis of the inductance of the coil. Specifically, the torque sensor includes a first oscillation circuit for detecting the inductance of the coil and for oscillating a signal having a period corresponding to the detected inductance. The period of the signal generated by the first oscillation circuit is detected by a period detection section. A torque detection section detects the torque on the basis of the period detected by the period detection section.

Abstract: A magnetic transducer element is formed in a portion (22) of a shaft (20) by an axially-oriented magnetic source (30) comprising a U-shape permanent magnet or electromagnet assembly, the gap (g) between the poles of which is small compared to the pole width (w). The source (30) is brought up to the continually rotating shaft (20) from a distance (D1) to a position closely proximate (D2) the shaft (20) and then retracting the source (30). With an electromagnet the mechanical movement may be emulated by controlling the energising of the electromagnet. An annular, surface-adjacent zone of axially-directed magnetisation is created whose external detectable field (40) has a distribution in the axial direction which shifts axially under applied torque. An axial or radial component may be sensed as a measure of torque. A method of preparing the shaft for magnetisation (magnetic-cleansing) and a post-magnetisation procedure is disclosed.

Abstract: An apparatus for contact-less measuring a difference angle between two parts rotating about a common axis comprises an annular shaped stator having magnetic pole pairs on an inner circumference, and a cylindrically shaped ferromagnetic rotor having pole ends for magnetically scanning the pole pairs of the stator. There are a first air gap between the pole pairs of the stator and the pole ends of the rotor; and an accessible and rotationally symmetric second air gap between the inner circumference of the stator and the rotor. The magnetic flux across the second air gap is changed according to the difference angle between the rotor and the stator. This is determined by a magnetically sensitive element which is arranged at a fixed position within the second air gap.

Abstract: In a temperature-compensating device of a torque sensor including a pair of coils in which inductance change in opposite directions corresponds to torque and a torque detecting means for outputting torque detection voltages from first and second voltages based on change in inductance of each of the pair of the coils, the torque detecting means having an adding means for adding the first voltage to the second voltage and outputting as a temperature detection voltage, a memory means for memorizing temperature characteristic of the temperature detection voltage of the adding means preliminarily measured, and a correcting means for correcting the torque detection voltage with a temperature detected from the temperature detection voltage outputted by the adding means according to the temperature characteristic.

Abstract: A compressor includes a front housing, a cylinder block, a cylinder head, a torque transmission mechanism, a reciprocating mechanism, and torque determination means. The torque transmission mechanism includes a pulley, a plate-shaped elastic member, a hub, a drive shaft, and a rotor. The torque determination means includes a first marker affixed to the pulley, a second marker affixed to the hub a first sensor affixed to the front housing which generates a first timing signal when the first marker is positioned within substantially the same vertical plane as the first sensor, and a second sensor affixed to the front housing which generates a second timing signal when the second marker is positioned within substantially the same vertical plane as the second sensor. Moreover, there is a time differential between the generation of the first and second timing signals corresponding to the angular offsets, and the torque of the compressor is determinable from the time differential.

Abstract: An outer cylinder having patterns of open windows of first to fourth channels is formed of a magnetic-shielding or antimagnetic substance. An inner cylinder is inserted in the outer cylinder, is formed of a magnetic substance and has patterns of nonmagnetic windows of the first to fourth channels. First to fourth coils excitable by A.C. are provided for the first to fourth channels. For each of the channels, the pattern of the open window in the outer cylinder and the pattern of the nonmagnetic window in the inner cylinder are arranged to overlap with each other.

Abstract: A rotation sensor provided with a first rotor fixed to a shaft, a second rotor fixed to the same or other shaft and adjoining the first rotor, and a core having a resonance coil, arranged around the first rotor, and which coil forms a magnetic circuit working with the first rotor. The first rotor is formed of a magnetic material comprising an insulator; an irregular magnetic field is formed with the core; and the second rotor is provided with a conductor cutting across areas of different intensities of the irregular magnetic field in accordance with the difference of the angle of rotation when a difference in the angle of relative rotation occurs at a shaft position where the first rotor is fixed and at a shaft position where the second rotor is fixed.

Abstract: A rotation sensor provided with a first rotor fixed to a shaft, a second rotor fixed to the same or other shaft and adjoining the first rotor, and a core having a resonance coil, arranged around the first rotor, and which coil forms a magnetic circuit working with the first rotor. The first rotor is formed of a magnetic material comprising an insulator; an irregular magnetic field is formed with the core; and the second rotor is provided with a conductor cutting across areas of different intensities of the irregular magnetic field in accordance with the difference of the angle of rotation when a difference in the angle of relative rotation occurs at a shaft position where the first rotor is fixed and at a shaft position where the second rotor is fixed.

Abstract: To provide a rotation sensor for detecting a relative rotation angle, which shows little variation in detection accuracy even in the presence of disturbances. The rotation sensor detects a variation in impedance of each of two exciting coils (12b) which is produced depending on the strength of eddy currents induced in first and second rotors (11, 13), and determines a relative rotation angle on the basis of a difference between the amounts of both variations. A first conductive layer (11a) is provided on at least one of the opposite sides of the first rotor as viewed along a rotation axis, and consists of a plurality of portions arranged in a circumferential direction of the first rotor with predetermined spaces between. The stationary core (12) is so arranged that a core body (12a) holding the two exciting coils (12b) is symmetrical with respect to a plane normal to the rotation axis.

Abstract: In a temperature-compensating device of a torque sensor including a pair of coils in which inductance change in opposite directions corresponds to torque and a torque detecting means for outputting torque detection voltages from first and second voltages based on change in inductance of each of the pair of the coils, the torque detecting means having

Abstract: A rotation sensor (10) provided with a first rotor (11) fixed to a predetermined position in the axial direction of the shaft, a second rotor (12) fixed to the shaft (5) adjoining the first rotor, and a magnetic material core (13) having a resonance coil (13c) arranged around the first rotor and forming a magnetic circuit working with the first rotor. The first rotor (11) is formed by a magnetic material comprised of an insulator, an irregular magnetic field is formed with the magnetic material core, and the second rotor (12) is provided with a conductor cutting across areas of different intensities of the irregular magnetic field in accordance with the difference of the angle of rotation when a difference in the angle of relative rotation occurs at a shaft position where the first rotor is fixed and a shaft position where the second rotor is fixed.

Abstract: Disclosed herein is a torque sensor for automobiles. The torque sensor includes a torsion bar for coaxially connecting an input shaft attached to a steering wheel and an output shaft attached to a steering mechanism. A plurality of detection rings are mounted on the circumferential surfaces of the input and output shafts. At least one detection coil assembly is arranged to surround the gaps between the detection rings. A sensor housing is provided to accommodate the detection coil assembly. A position securing element is secured to the sensor housing to be brought into tight contact with the side surface of the detection coil assembly through the side of the sensor housing with a friction plate interposed between the detection coil assembly and the position securing element for securing the position of the detection coil assembly.

Abstract: The present invention provides a torque sensor comprising: a pair of coils having inductances changing mutually in a reverse direction in accordance with a torque; a first differential amplifier means inputting first and second sub-voltages based on each inductance change of the both coils, and amplifying a difference between the first and second sub-voltages so as to output it as a first main voltage; a second differential amplifier means inputting third and fourth sub-voltages based on each inductance change of the both coils, and amplifying a difference between the third and fourth sub-voltages so as to output it as a second main voltage; and an abnormal state signal outputting means outputting an abnormal state signal when a difference between the first and second main voltages exceeds a predetermined allowable range, the torque sensor further including: an abnormal state comparator means for judging an abnormal state of the coils from the first, second, third and fourth sub-voltages; and a voltage displa

Abstract: A torque sensor includes a pair of detection coils having the impedances that change in opposite directions of each other corresponding to a torque generated in a rotation shaft. An AC voltage is applied on a bridge circuit including a pair of detection coils and a pair of resistors, a differential voltage between AC voltages that appear on both ends of the pair of detection coils is detected and sent out as the torque signal, and a failure of a circuit component of the torque detecting circuit is judged based on the phase difference between the waveform of the AC voltage applied on the bridge circuit and the waveform of the differential voltage between AC voltages that appear on both ends of the pair of detection coils.

Abstract: A torque sensor for automobiles capable of maintaining initial fabricated positions of components in a housing even though being subjected to thermal expansion or external shock is disclosed. Retaining elements made of resilient material having excellent damping capability are interposed between an inner surface of a housing and each of detection coil assemblies by molding process to enable the components received in the housing to be securely held. Though being subjected to external vibration or shock, the external effect can be absorbed by damping effect of the retaining elements. Though the components in the housing thermally expand due to temperature variation, the retaining elements are elastically deformed to accommodate volume increase by the thermal expansion. Since fabricated positions of the components can be securely maintained without axial and radial displacement, it is possible to precisely detect torque acting on a torsion bar.

Abstract: Disclosed herein is a torque sensor for automobiles. The torque sensor includes a torsion bar for coaxially connecting an input shaft attached to a steering wheel and an output shaft attached to a steering mechanism. A plurality of detection rings are mounted on the circumferential surfaces of the input and output shafts. At least one detection coil assembly is arranged to surround the gaps between the detection rings. A sensor housing is provided to accommodate the detection coil assembly. A position securing element is secured to the sensor housing to be brought into tight contact with the side surface of the detection coil assembly through the side of the sensor housing with a friction plate interposed between the detection coil assembly and the position securing element for securing the position of the detection coil assembly.

Abstract: The present invention discloses an abnormal state detecting apparatus in a torque sensor which uses a pair of coils to detect a torque on the basis of a change in inductance.

Abstract: The rotation sensor (10) has a cylindrical first rotor (11) made of an insulating magnetic material, having conductor layers (11a) arranged circumferentially, the first rotor being attached to a rotating first shaft (5a) at a predetermined axial position; a fixed core (12) having an exciting coil (12b), the core being fixed to a fixing member with a space secured in the axial direction with respect to the first shaft; a second rotor (13) having nonmagnetic metal bodies (13b) arranged circumferentially to oppose the conductor layers respectively, the second rotor being attached to a second shaft located adjacent to and rotating relative to the first shaft (5a) and being located between the first rotor (11) and the fixed core (12); and oscillating device connected to the exciting coil (12b), the oscillating device transmitting an oscillation signal of a specific frequency.

Abstract: To provide a rotation sensor for detecting a relative rotation angle, which shows little variation in detection accuracy even in the presence of disturbances.

Abstract: A torque sensor having an improved detection accuracy is disclosed. The torque sensor includes a cylindrical stator. The stator is arranged to face a magnetostrictive member fixed to a shaft. The stator includes a stator body and two retainer rings. When assembling the stator body and the two retainer rings, a pair of exciting coils and a pair of detecting coils are accommodated in the inner wall of the stator. Joints between the stator body and the two retainer rings are not exposed to the inner surface of the stator.

Abstract: A sensor for measuring the relative displacement between two rotating shafts. The sensor can sense a torque applied to the steering wheel of a vehicle. The sensor has a housing that has apertures at each end. The rotating shafts pass into the housing. A sensor assembly is located in the housing and connected to the shafts. The sensor assembly generates an electrical signal that is proportional to the relative rotational displacement between the shafts. An electrical connector is located in the housing and electrically connects with the sensor assembly. The sensor assembly has a planetary gear assembly that is connected to the shafts. A variable magnetic field generator is connected to the planetary gear assembly and moves proportional to the relative rotational displacement of the shafts. A magnetic field sensor is located adjacent the variable magnetic field generator and generates the electrical signal as the variable magnetic field generator moves.

Abstract: A load detection device according to this invention has a detection section including a magnetization coil (2) and a solid rod-like magnetic substance disposed in the axial center of the magnetization coil (2), the magnetic substance (1) is magnetized by the magnetization coil (2), and load (P) is applied directly to the magnetic substance (1) to produce inductance change, so as to be detected. Therefore, according to this invention, the device is simplified in its construction with a high mechanical strength and a wide dynamic range, capable of effecting smaller size, weight saving and cost reduction, as well as easy handling ability, and suitable for transfer. In addition, the load (P) is detected from inductance change due to change in magnetic permeability of the magnetic substance (1) caused by the load, so that no displacement is accompanied with detection, providing a structure capable of achieving high direct response and easy adjustment with small hysteresis, and unlikely to be affected magnetically.

Abstract: The present invention discloses an abnormal state detecting apparatus in a torque sensor which uses a pair of coils to detect a torque on the basis of a change in inductance.

Abstract: A torque sensor having a plurality of axial grooves formed on an outer circumferential surface of the end portion of a first rotation shaft to which a cylindrical member is fixed so as to be extended in an axial direction of the first rotation shaft. A circumferential groove is continuously and circumferentially formed on the outer circumferential surface of the end portion of the first rotation shaft. A plurality of protrusions are formed on an inner circumferential surface of the cylindrical member to be fitted into the plurality of axial grooves respectively to thereby prevent a rotation of the cylindrical member relative to the first rotation shaft. A portion of the cylindrical member which is disposed outward of the circumferential groove is deformed to fit into the circumferential groove to thereby prevent an axial displacement of the cylindrical member relative to the first rotation shaft. Further, a coil unit having a coil is disposed so as to enclose a second rotation shaft.

Abstract: A magnetostrictive sensor for outputting a signal representative of torque on a shaft includes one or more excitation coils that generate magnetic flux which permeates the shaft and pickup coils that detect the flux after the flux passes through the shaft. Torque on the shaft affects the magnetic flux passing through the shaft. A coupling member such as plural rollers or powder metal poles are disposed in the flux path and touch the shaft such that no air gap exists in the flux path. Consequently, the sensor is comparatively sensitive, and is not unduly effected by shaft run-out.

Abstract: A torque detection device for detecting a torque applied to a bicycle for controlling power output of a motor applied to the bicycle in helping moving the bicycle is disclosed. The torque detection device includes a shaft coupled to a driving chain wheel and pedals of the bicycle. A circuit including strain gauge based elements is embedded in the shaft for converting a torsional deformation caused by the torque applied to the shaft by a rider via the pedals into an electrical signal. The electrical signal, after being properly processed, is applied to a motor power controller which in turns controls the power output of the motor whereby the torque from the motor is determined based on the torque applied by the rider to the bicycle. Thus, as the rider applies a great torque to the pedals, the motor correspondingly supplies a large output of power to the bicycle for helping moving the bicycle. No additional manual control of the motor is needed.

Abstract: Method and device for increasing the accuracy when performing measurements with a torque sensor (1, 2) in engines, which is mounted substantially concentrically in connection to a rotatable shaft (12), where said torque sensor (1, 2) is constituted by at least one coil (20, 22), and at least one zone (30) which is provided with parallel lines of a suitable conductive material such as copper. The coil (20, 22) is provided with connections for measuring the voltage, whereby the rotatable shaft (12) has a recess (50, 52). The zone (30) is either placed on the inner envelope surface of the recess (52) where said zone (30) encloses a stationary coil (22) which is journalled in the recess (52), or on an outer envelope surface of a measuring shaft (10) attached in the recess (50), which is enclosed by a stationary coil (20).

Abstract: A rotation sensor (10) provided with a first rotor (11) fixed to a predetermined position in the axial direction of the shaft, a second rotor (12) fixed to the shaft (5) adjoining the first rotor, and a magnetic material core (13) having a resonance coil (13c) arranged around the first rotor and forming a magnetic circuit working with the first rotor. The first rotor (11) is formed by a magnetic material comprised of an insulator, an irregular magnetic field is formed with the magnetic material core, and the second rotor (12) is provided with a conductor cutting across areas of different intensities of the irregular magnetic field in accordance with the difference of the angle of rotation when a difference in the angle of relative rotation occurs at a shaft position where the first rotor is fixed and a shaft position where the second rotor is fixed.

Abstract: The device of this invention is provided with a disc-shaped spring having an outer peripheral portion placed into contact with an outer race of a bearing and a tapered portion placed into contact with an end portion of a coil yoke, with the configuration being such that the coil yoke is wedged between a concavity 1d of the housing and the upper edge by the elastic force of the disc-shaped spring. It is therefore possible to fix the coil yoke within the housing without having to provide extra components such as a snap ring, which facilitates machining and assembly. In addition, the sealing effect can be increased by placing the disc-shaped spring into contact with the entire periphery of the outer race of the bearing, thus efficiently preventing the intrusion of impurities.

Abstract: In order to improve the measurement possibilities with regard to a rotating shaft, including the whole angle area (0 to 360°), a rotation angle sensor is mounted that is provided with a radial-bipolar ring-shaped magnetic element (3), three air gaps (5, 6, 7, 8) displaced by an equal angle (&phgr;) being connected with said shaft, and with a stator element (4) of a magnetoconductive material, while a Hall integrated circuit element (1, 2) is inserted in at least two adjacent air gaps (5, 6, 7, 8). The two Hall integrated circuit elements (1, 2) can be connected to an evaluation unit (9) which records a voltage curve of the measured circuit for each circuit element (1, 2), assigns each flow voltage measure to a position angle on the Hall integrated circuit voltage curves, calculates from the position angles assigned to the flow voltage values the actual position angle and gives it as the start signal (A1, A2).