Abstract: A bearing provided with a rotation sensor comprises an outer ring, an inner ring and rolling elements, and a magnetic ring is engaged with the inner diametral surface of the outer ring. Thus, a highly reliable bearing provided with a rotation sensor exerting no bad influence on a magnetic sensor can be provided.

Abstract: The magnetoresistive detector of the present invention uses magnetoresistive elements for detecting changes in the magnetic field of a moving magnet 3 which changes a magnetic field, wherein bias magnets (21, 22, 23, 24) can be mounted without using positioning jigs, errors in mounting are prevented, and the mounting density of components on a printed circuit board (4) is improved, whereby improved quality and compactness of the magnetoresistive detector can be achieved. For that purpose, the shape and dimensions of magnetoresistive detector elements (11, 12, 13, 14) are made identical to the shape and dimensions of the bias magnets (21, 22, 23, 24), and on the printed circuit board (4), positioning sections (41) for simultaneously positioning the magnetoresistive detector elements (11, 12, 13, 14) and bias magnets (21, 22, 23, 24) are provided.

Abstract: A rotation detecting device has various portions that are covered with a resin-molded section. After integrally molding the first and second cores 8 and 9, permanent magnet 10, and terminal 14 within a resin-molded section 11, a coil 12 is wound in a slot section 11a formed in the resin-molded section 11. Then, of the resin-molded section 11, the coil 12 and the terminal 14 are electrically connected in a recess formed at an outer periphery of the resin-molded section. Accordingly, the coil 12 is not liable to be damaged by a contact of a high-temperature, high-pressure resin during the molding process.

Abstract: A noise reduction device is provided that mounts at the intersection of a pair of spokes of a bicycle wheel. The noise reduction device can also have magnetic properties for use with a bicycle monitoring device. In a preferred embodiment, the noise reduction device is a magnetic device that has a body portion and a magnet. The body portion has at least one spoke-receiving recess on one side, and at least another spoke-receiving recess on the other side. In an alternate embodiment, the spoke-receiving recesses are irregularly shaped, so as to accommodate a variety of spoke angles. When the magnetic device is used with a monitoring device, it communicates with a sensing device, which is adapted to be coupled to a portion of the bicycle that is adjacent to a wheel of the bicycle. A display unit is adapted to be mounted on handlebars of the bicycle for displaying the speed of the bicycle or other information obtained from sensing the rotation of the wheel.

Abstract: The invention provides a magnetic object motion sensor which can operate with high accuracy not only when a magnetic object moves at high speeds but also even when it moves at low speeds, which can be produced with a greater production tolerance and a greater dimensional tolerance.

Abstract: A magnetic device mounts on a flat spoke of a wheel. This magnetic device can comprise a magnet and a housing. The housing is coupled to the magnet, and has a spoke-receiving recess with a non-circular cross section, and at least one detent. The detent extends from the housing into the spoke-receiving recess to secure a flat spoke within the spoke-receiving recess via a snap-fit. The magnetic device communicates with a sensing device, which is adapted to be coupled to a portion of the bicycle that is adjacent to a wheel of the bicycle. A display unit, adapted to be mounted on handlebars of the bicycle, displays the speed information obtained from the sensing device. In a second embodiment, the housing is made of a more elastic material, and the detents become optional. In a third embodiment, the spoke-receiving recess of the housing has a projection that engages a concavity form in the connecting portion of the spoke.

Abstract: A tone wheel includes a cylindrical elastic multipole magnet formed by a cylindrical elastic inner lining element and a metallic ring in which the cylindrical elastic inner lining element is shaped into a cylindrical form from a composite material including a mixture composed of any suitable elastic material and any suitable powdery ferromagnetic material, and is disposed inside the metallic ring in such a way that its inner circumferential surface is inclined at a predetermined angle of inclination “&thgr;” with regard to the center axis through the cylindrical elastic inner lining element. A magnetizing yoke is further included, wherein the yoke has its outer circumferential wall formed to have the angle of inclination corresponding to the predetermined angle of inclination “&thgr;” of the cylindrical elastic inner lining element, and provides alternating S and N (or N and S) polarity pattern in the circumferential direction of the outer circumferential wall.

Abstract: A rotational position detecting apparatus for an internal-combustion engine for use with a Hall IC comprising at least two Hall elements for detecting the protrusion of a rotator. One of the two Hall elements is arranged with a magnet for forming a magnetic field, and the magnet is disposed on one side of the Hall IC to form a magnetic circuit for converging the magnetic flux on only one element within the Hall IC.

Abstract: A rolling bearing unit for the hub of a vehicle wheel has an outer rotating race (10), a radially inner stationary race (11), a sealing device (16) between the races (10, 11), and a device for measuring the rotating speed of the outer race (10). The measuring device has an encoder wheel (13) in the form of a radially oriented annular disc of magnetised plastic or rubber material.

Abstract: A magnetization yoke having an exciting coil wound thereon is arranged to hold a magnetic member and a metal ring so that a magnetic flux passes through and magnetizes the magnetic member in the portion held by the magnetization yoke for successively magnetizing the magnetic member along the circumferential direction thereby multipolarly magnetizing the magnetic member in the circumferential direction. Thus, a magnetic encoder having large magnetization strength and a small magnetization pitch error, a wheel bearing employing the same and a method of manufacturing a magnetic encoder can be obtained.

Abstract: A method and apparatus wherein a single dual element galvanomagnetic sensor, herein exemplified by a single dual element magnetoresistive sensor (16′), is utilized to sense crankshaft position and rotational speed from the passage of single tooth edges (12′) of a target wheel (10′) by continuous adaptive matching of both MR output signals (VMR1′, VMR2′) during sensor operation. Over a slot (28′) or tooth (26′), both MR output signals should be equal, and if not, they are matched by adjusting the current of one of the current sources (30′, 32′) driving the MRs, performed over a slot or a tooth. Due to higher magnetic sensitivity at smaller air gaps, matching by current adjustment over a tooth is preferred. In a preferred embodiment of the present invention, one MR is driven by a constant current source (30′) while the other MR is driven by a voltage controlled current source (32′).

Abstract: In an evaluation circuit for evaluating an output signal of a magnetoresistive sensor (1) for rotational speed measurement, in which the evaluation circuit performs an offset compensation of the sensor signal and comprises a comparator (4) which receives the offset-compensated sensor signal and compares it with a reference voltage, a reliable identification of the output signal of the sensor after switching on the arrangement is ensured in that, in an initial mode, the value of the reference voltage is selected in dependence upon the temperature, the temperature dependence being approximated to that of the sensor signal, in that a control unit (6) is provided which, in the initial mode, consecutively checks whether the sensor signal is present, triggers the offset compensation only after the presence of said signal, subsequently checks whether the comparator (4) supplies an output signal, and changes over to a control mode only after the presence of said signal, in which control mode the temperature dependenc

Abstract: An ABS sensor bracket made up of two mounting wing plates engaged to a sensor receiver. The sensor receiver is generally cylindrical and is mounted between the wing plates such that the sensor receiver is asymmetric axially relative to the caliper anchor plate. When viewed from the side, there is a shorter end of the sensor receiver jutting out a shorter distance from the wing plates than an opposite longer end of the sensor receiver. In one embodiment, a first end of the sensor receiver has an outer diameter circumference greater than that of the opposite second end. The caliper anchor plate has an outer edge slot for mounting of the ABS sensor brackets. The outer edge slots are generally ‘U’ or ‘V’ shaped. There are mounting holes in the outer radial areas bordering the outer edge slots.

Abstract: A trip meter includes a bracket secured to a member of a bicycle, a main body detachably secured to the bracket, a signal receiving circuit positioned in the main body for wirelessly receiving a pulse signal outputted from a transmitter, and a signal processing circuit electrically connected to the signal receiving circuit for counting a number and a frequency of the pulse signal and correspondingly generating an output signal indicative of the plurality of trip data.

Abstract: A magnet structure including a magnet and an integral magnetically permeable concentrator and methods for making the same are provided. In one embodiment, the concentrator has a substantially planar base and a post extending normal to the base and the magnetic element is a ring magnet having a central aperture through which the concentrator post extends. The concentrator is comprised of a plastic loaded with one or more magnetically permeable materials to a percentage suitable for providing desired magnetic field characteristics. The magnetic element may be comprised of a conventional magnetic material or a plastic loaded with one or more magnetic materials. An insert molding technique is described in which either the concentrator or magnetic element is prefabricated and inserted into a mold which is subsequently filled with a loaded plastic to provide the other component of the magnet structure.

Abstract: A pulser ring and a pickup sensor are sealingly housed by a seal so as to prevent the penetration of foreign matters. The pulser ring is fixedly mounted on one end face side of an inner ring that is mounted on a drive shaft side to thereby rotate together therewith. The seal has a resilient material mounted at a distal end of a metal ring, and is fixedly mounted on one end face side of an outer ring fixed to a vehicle body side which one end face side corresponds to the one end face side of the inner ring. The seal encompasses the pulser ring inside thereof. The resilient material of the seal is brought into close and slidable contact with an outer circumferential surface of a drive shaft. The pickup sensor is supported by the metal ring.

Abstract: A sensor device to record the speed and motion direction of an object, especially rotational speed and direction of a rotating object, based on the magnetoresistive effect, is provided with a magnetic field generator (2, 15) coupled to object (1), which generates a locally and time-defined varying reference magnetic field (H), with two magnetic field sensors (SE1, SE2) made of a magnetoresistive material, which are positioned at a stipulated spacing (&Dgr;y) from each other relative to magnetic field generator (2, 15) so that they are traversed by magnetic field components (H1, H2) of the reference field (H) that are phase shifted relative to each other, in which the phase shift &Dgr;&PHgr; is not equal to an integer multiple of 90°, and with a signal processing circuit (5), which records the magnetoresistive resistance (R_MR1, R_MR2) of the magnetic field sensors (SE1, SE2) dependent on the magnetic field components (H1, H2) in the magnetic field sensors (SE1, SE2) and generates from it electrical signal

Abstract: A magnetic field sensor assembly has a magnet, a semiconductor sensor and a metal leadframe encapsulated in a plastic package to form a semiconductor integrated circuit. A metal leadframe has a die attach pad on which the sensor is secured and an assembly having one or more projections for securing the magnet in close proximity to the sensor. The leadframe is made from a metal having sufficient spring tension so that the assembly having the projections will secure the magnet. The sensor is adjacent to a ferromagnetic object and will detect a change in magnetic field caused by the ferromagnetic object. Only a thin layer of the plastic package covers the sensor thus reducing the distance between the sensor and the ferromagnetic object but still maintaining an air gap between the plastic package and the ferromagnetic object sufficient to allow passage of the ferromagnetic object.

Abstract: An improved position encoder system for providing an output signal representative of the position of a movable body, relative to a reference position, includes at least one magnetic element fixedly attached to the movable body. The system further includes a first spatially orthogonal fluxgate sensor pair and a second spatially orthogonal fluxgate sensor pair for detecting the magnetic field. The first sensor pair is disposed adjacent to the polar axis at a first predetermined distance, and the second pair is disposed adjacent to the polar axis at a second predetermined distance, preferably twice the first predetermined distance. The system further includes a signal processor for receiving a signal from the first sensor pair and a signal from the second sensor pair.

Abstract: A speed sensor assembly is provided that isolates the internal components of the speed sensor from detrimental external environmental influences. Further provided is a new seal that seals between a housing and an overmold of a speed sensor and is capable of use in speed sensors of varying types and of all different sizes and shapes. Provided is a seal in which a bead of glue cured by ultraviolet light is applied around part of the exterior surface of a housing, after which an injected molded plastic overmold is applied over at least that part of the housing having the applied ultraviolet cured glue. In this way, once the housing is overmolded, the ultraviolet cured glue forms a gasket-like seal between the housing and the overmold preventing the penetration of water or other contaminants into the internals of the speed sensor. Also provided is a mounting fixture for use during a process of applying the seal to the housing.

Abstract: A target wheel sensor includes a sensing structure (112) disposed within a hollow sensor housing (102). The sensing structure (112) has a T-shaped spool (114) that includes a pole piece holder (116) that terminates in a magnet holder (118). Moreover, a pole piece (120) and a magnet (122) are slidably engaged within the pole piece holder (16) and the magnet holder (118) respectively. The magnet (122) and the pole piece (120) are magnetically coupled so that the pole piece (120) is magnetized by the magnet. Also, the magnet (122) and the pole piece (120) are physically coupled so that they move in unison within the sensing structure (112). A metal target wheel (130) having one or more teeth (132) is provided and works in conjunction with the sensor (100).

Abstract: Disclosed is a magnetic detector in which a GMR device is operated within the limited range of a magnetic field so as to optimize a temperature characteristic of changes in resistance value and to improve noise resistance. The magnetic detector comprises a magnet (4) for generating a magnetic field, a rotary member (2) of magnetic material arranged with a predetermined gap left relative to the magnet and provided with projections capable of changing the magnetic field generated by the magnet, and a giant magnetoresistance device (3) of which resistance value is changed depending on the magnetic field changed by the rotary member of magnetic material. The giant magnetoresistance device is arranged to have such a predetermined gap relative to the magnet that the giant magnetoresistance device operates under a magnetic field applied to change in a predetermined amplitude range, e.g.

Abstract: The rotation of a rotating magnet is detected by magnetic sensors. The rotational speed is detected from pulse signals detected by magnetic sensors, and the rotational direction thereof is detected from the difference in the way of making a shift in phase. Signals different in pulse width are generated according to the rotational direction. A signal selection circuit outputs a corresponding pulse signal with timing for the rotational speed. A rotational speed determining circuit outputs a decision signal Sf of a high level when the rotational speed reaches a predetermined speed. When a self-diagnostic circuit determines that the magnetic sensors have malfunctioned, a binary error code generating circuit generates an error signal Sg and a 4-bit error code signal Sh.

Abstract: A magnetic metal sensor having a high response speed and which can detect small-sized metal pieces and can elongate the separation from the metal pieces. A magnetic metal sensor 2 has a core 22 defining a substantially U-shaped open magnetic path and coils 23, 24 of the same polarity mounted on the core 22. A uniform magnetic field along the direction of magnetic sensitivity is applied by a magnet 25 across the coils 24, 24. If magnetic metal approaches to a open magnetic path portion of the core 22 of the magnetic metal sensor 2, the magnetic reluctance of the magnetic circuit formed by the core and air is changed, as a result of which the impedance of the cores 23, 24 is changed. The magnetic metal sensor 2 detects the possible presence of magnetic metal or its displacement based on impedance changes of the paired coils 23, 24.

Abstract: A device for measuring the rotation of a rotating element comprising an encoder element rotating with the rotating element and a sensor unit connected to a stationary element. A scraping element cooperates with a surface of the encoder element in order to eliminate contaminating particles present on the surface of the encoder element. The scraping element may be carried on the sensor device and may be biased against the encoder element by an elastic device or by magnetism.

Abstract: A tire (12) used includes a steel belt in its outer circumferential portion. A magnetic sensor (14) including a pair of magnetic detection elements (18A, 18B), which are arranged so that their magnetic detection directions become parallel to each other or series each other, is set in the vicinity of a rear tire (12) in a trunk room of a vehicle (10). Changes in magnetic field upon revolution of the tire (12) are differentially detected by the magnetic detection elements (18A, 18B), and the revolution of the tire (12) is detected on the basis of the differentially detected output waveform. Among a plurality of peaks present in the differentially detected output waveform, a peak, the potential difference from the immediately preceding peak of which is equal to or larger than a predetermined threshold value, is detected as an effective peak, which is effective for tire revolution detection, and the revolution speed of the tire is calculated by detecting the number of effective peaks.

Abstract: A sensor is positioned to sense the magnetic field strength of a magnet associated with a rotating body. The sensor produces a signal having a sinusoidal output as the magnet rotates with the rotating body. A controller takes a derivative of the output and calculates the rotational velocity of the rotational body as a function of the derivative.

Abstract: A rolling bearing unit has a rotational speed detection device which is comprised of a sensor having a yoke, a pair of permanent magnets and coil, and a tone wheal which is made by press-forming a magnetic metal plate so as to comprise a cylindrical support base secured onto an end portion of the bearing unit, a ring-shaped first detecting part which is bent radially outward from the inner rim of the cylindrical support base, and a cylindrical shaped second detecting part which extends axially from the outer peripheral rim of the first detecting part the first and second detecting parts having a ferro-magnetic first portion and a non-magnetic second portion, and the yoke having opposite ends to be faced to the first and second portions, and the permanent magnets being faced to each other so that magnetic fluxes flow alternatively through the yoke corresponding the rotation of the tone wheel.

Abstract: A roller bearing unit having a rotating speed detector includes an outer race, an inner race, a cover made of synthetic resin, a sleeve made cylindrically of metal and a seal ring fitted in an engaging groove of an engaging portion of the cover. The seal ring is disposed between the inner surface of the outer race and the cover so as to prevent the entrance of muddy water into the unit.

Abstract: Disclosed is a magnetic detector in which a GMR device is operated within the limited range of a magnetic field so as to optimize changes in resistance value of the GMR device and to improve noise resistance. The magnetic detector comprises a magnet (4) for generating a magnetic field, a rotary member (2) of magnetic material arranged with a predetermined gap left relative to the magnet and provided with projections capable of changing the magnetic field generated by the magnet, and a giant magnetoresistance device (3) of which resistance value is changed depending on the magnetic field changed by the rotary member of magnetic material. The giant magnetoresistance device is arranged in such a position with a predetermined gap relative to the magnetic field generating means that the giant magnetoresistance device is subject to a bias magnetic field applied with the intensity of magnetic field in a predetermined range, e.g.

Abstract: An improved detector is provided for installation in a roadway surface. The detector finds utility in a highway vehicle detection system for determining vehicle presence, vehicle speed and vehicle length. First and second matched induction coil magnetic sensors are maintained at or near the roadway surface. Each of the sensors has a longitudinal axis aligned normal to the roadway surface. The first and second sensors are separated from one another by a known distance in a direction substantially aligned with a direction of traffic flow. Each of the sensors generate a differential magnetic field signature with respect to time to indicate a passing vehicle's leading and trailing edge magnetic signatures. Vehicle speed is determined by a time-distance relationship using the leading and trailing edge magnetic signatures and the known distance. Vehicle length is determined by a time-speed relationship using the leading and trailing edge magnetic signatures and the determined vehicle speed.

Abstract: A speed sensor (10) includes a sensor housing (12) mounted to the wall of a transmission, and a pole piece (34) extends out of the sensor housing (12) into the transmission fluid. The pole piece (34) is held by a plastic spool (26) within the sensor housing (12), and an electric coil (28) surrounds the spool (26) and is magnetically coupled to the pole piece (34). The spool (26) is formed with a rib ring (41) that extends away from the pole piece (34) and that terminates in an outer periphery that is closely spaced from the inside wall of the sensor housing (12). To block metal particles in the fluid from entering between the spool (26) and sensor housing (12) that would otherwise damage the coil (28), two ribs (60) are formed on the outer periphery of the spool (26), and an interference fit is established between the ribs (60) and the sensor housing (12) such that the ribs (60) are deformed and the contaminants thereby blocked.

Abstract: A magnetic field sensing element comprising a giant magnetic resistance element formed on a substrate for detecting a change in a magnetic field, an integrated circuit formed on the substrate for carrying out predetermined arithmetic processing based on a change in the magnetic field, and an input side protective resistor and an output side protective resistor provided on the input side and the output side, respectively, of the integrated circuit, wherein the metal film from which the input side resistor and the output side resistor are formed is identical to the metal film from which the integrated circuit is formed.

Abstract: An electromechanical dimensioning device measures dimensional attributes of an object and transmits the dimensional attributes from the dimensioning device to a remote receiving device. The dimensioning device converts rotational motion of a measuring wheel into a linear distance traveled by the wheel. In one embodiment, the dimensioning device incorporates a rechargeable battery power source and a radio frequency transceiver, allowing fully portable operation. The dimensioning device also optionally includes a bar code scanner for identifying the dimensioned object.

Abstract: A magnetic assembly is provided for a bicycle monitoring device. The magnetic assembly includes a magnetic device that mounts on a special spoke of a wheel. This magnetic device has a housing with a magnet secured thereto. The housing has a spoke-receiving recess that receives the spoke. The housing can be secured to the spoke within the spoke-receiving recess via a snap-fit or an elastic fit. In one embodiment, the spoke-receiving recess of the housing has a projection that engages a concavity form in the connecting portion of the spoke. In another embodiment, the spoke-receiving recess of the housing has a concavity that engages a projection form on the connecting portion of the spoke. The magnetic device communicates with a sensing device, which is coupled to a portion of the bicycle that is adjacent to a wheel of the bicycle. A display unit that is mounted on handlebars of the bicycle displays the speed information obtained from the sensing device.

Abstract: In the case of a method for checking the width of the measuring air gap of a magnetic speed sensor, square-wave output signals are generated from the measurement signals of the sensor by means of at least one prescribable threshold value. The pulse duty factor of the output signals is held within a prescribed range in the case of an acceptable gap width. In the case of amplitudes of the measurement signal outside prescribed limits, the pulse duty factor deviates in a reliably measurable fashion from the prescribed range. A circuit has the means for carrying out this method.

Abstract: A measurement device has a laser light source for irradiating a laser light, a reflecting mirror for reflecting the laser light irradiated from the laser light source in a preselected direction and/or for scanning the laser light within a preselected angle range, and an oscillating motor for driving the reflecting mirror to reflect the laser light in the preselected direction and/or oscillating the reflecting mirror within the preselected angle range to scan the laser light. The oscillating motor has a main shaft for undergoing rotational oscillating movement and for supporting the reflecting mirror for rotational oscillating therewith, a connecting device for removably connecting the reflecting mirror to the main shaft, and a detecting device for detecting a rotation angle of the main shaft. A reflector reflects the laser light reflected and/or scanned by the reflecting mirror. A light receiving element receives the laser light reflected by the reflector.

Abstract: A rotation detecting apparatus comprises a casing body including a head portion, an installation bracket portion and a connector portion. A recess portion is formed at a side surface of the head portion. A magnet, a Hall-effect device and a circuit base plate are installed in the recess portion and are then covered with a sealing member. Further, a clearance groove is formed in the vicinity of a wall defining the recess portion. Therefore, the number of parts and the production cost of the apparatus are reduced, and the waterproof performance thereof is improved.

Abstract: The inductive wheel-speed sensor registers the rotational speed of a motor vehicle wheel. The wheel is mounted on a hub, which is rotatably mounted on an axle journal. The sensor has a transmitter wheel that rotates with the wheel and that is formed by a sequence of regions of magnetizable material separated from one another by regions of non-magnetizable or barely magnetizable material. Two magnets are stationarily mounted such that their magnetic flux varies as the magnetized and non-magnetized portions of the transmitter wheel pass by, as the wheel rotates. The variation depends on the rotational speed. The magnetic flux change in the two (or more) magnets is registered coils which are disposed in the vicinity of the magnets. The output signal of the coils is fed to an evaluation device.

Abstract: A position sensing device (2) has a magnetic field generating device (3) with at least one magnetic pole (4.sub.j) and a sensor device (5) with at least one sensor (6) with an enhanced, specifically a giant magnetoresistive, effect. The magnetic field generating device (3) is arranged with respect to the sensor device (5) in such a way that the direction of a normal (H.sub.1) to the plane of the sensor (6) runs at an angle different from zero with respect to an imaginary reference line (L.sub.1) on which the at least one magnetic pole (4.sub.j) is located, and the magnetic field generating device (3) is to be moved with respect to the sensor device (5) so that the magnetic field (h) of the at least one magnetic pole (4.sub.j) is detected by the sensor (6), causing a sweep through at least part of the sensor characteristic, with the number of sweeps determined by the number of magnetic poles detected.

Abstract: The bogie comprises an axle (14) rotatably mounted on a fixed underframe, and measurement apparatus for measuring a physical magnitude related to rotation of the axle (14). The measurement apparatus (34) comprises a metal disk (36) secured to the axle (14) and provided with at least one mark-forming perforation (40), and a fixed detection assembly (50) for detecting the mark, which assembly comprises at least one inductive proximity detector (52). Preferably, the disk (26) is fixed to a collector ring (26) of a current return assembly (24) for transferring the current coming from a motor of the bogie to the axle (14).

Abstract: A rotational speed-detecting device of the present invention drives a sensor means 11, which includes a detecting unit that connects magneto-electric elements in series. A comparison voltage generator connects comparison voltage resistors in series, and is connected in parallel with the detecting unit, with a constant voltage by a constant-voltage control means 13, to which constant voltage is supplied by a constant-voltage generating means 14. The constant voltage means 14 controls a constant current of the constant-current means 15 with an on-and-off output from a comparison means 12 so as to superpose and flow a rectangular wave current in a power supply line between Vcc and VR.

Abstract: A magnetic object motion sensor which can operate with high accuracy not only when a magnetic object moves at high speeds but also even when it moves at low speeds, which can be produced with a greater production tolerance and a greater dimensional tolerance.

Abstract: A pulse signal generator comprises a magnetic element (1) capable of causing a large Barkhausen jump; a detector (2) provided relative to the magnetic element; a magnetic field generator (3) provided in vicinity of the magnetic element for applying a biasing magnetic field to the magnetic element for making a predetermined magnetization; and a magnetic circuit forming unit (4) provided in vicinity of the magnetic element for applying a main magnetic field to the magnetic element for causing a large Barkhausen jump in the magnetic element. The magnetic field generator is provided with magnetic field concentration means (32A) for concentrating the biasing magnetic field upon the magnetic element and the magnetic field adjusting means (74) for adjusting an intensity of the biasing magnetic field upon the magnetic element.

Abstract: A speed sensor for sensing rotating speed of a wheel having projections. An elongated tubular sensor body connects to a flange, the flange being adapted from mounting in a housing wall in proximity to the wheel. A Hall-Effect sensor is provided within the sensor body and circuitry is also located there for processing signals from the Hall-Effect sensor. The Hall-Effect sensor is positioned for sensing the projections of the wheel through a portion of a peripheral sidewall of the cylindrical sensor body so that the Hall-Effect sensor is "side-looking". An alignment mark is employed to position the Hall-Effect sensor in sensing alignment with the wheel. A diameter of the flange cooperates with a placement of a receiving aperture in the housing for setting a width of a gap between the portion of the sensor body through which the Hall-Effect sensor is sensing and the projections of the wheel.

Abstract: According to the present invention, a zero-speed rotary pulse generator is disclosed. The zero-speed rotary pulse generator detects and counts shaft rotation of DC motors. The invention measures the rotation of a shaft by being coupled to a disc-shaped magnet having alternating polarity on its face. The magnet rotates at the same speed as the motor. Positioned close to the rotating magnet is a Hall effect device that can sense the alternating magnet polarity as the shaft rotates. The Hall effect device provides a digital output based upon the direction and the strength of the magnetic field it senses.

Abstract: A fan assembly (10) includes first and second housing sections (70, 72) which, when mated by a first set of fasteners, define a plurality of circumferentially spaced openings (162) that lead to an internal housing chamber (82). The fan assembly (10) also includes a plurality of blade units (140), each of which includes an integral support stem (142) having a journal portion (148) rotatably mounted within a respective one of the openings (162), an enlarged flange portion (144) and a radial post portion (138) rotatably supported by a hub member (106) within the internal chamber (82). Each blade unit (140) preferably has a thrust bearing (156), bushing sleeve (158) and fan blade (152) integrated with the support stem (142), with the fan blade (152) being preferably molded to the support stem (142) following positioning of the thrust bearing (156) and bushing sleeve (158) to form an integral component.

Abstract: A magnetoresistance element detects an angular position of a toothed gear rotated by an engine. The element (first element) is positioned at a vicinity of the peripheral edge of the gear tooth in a magnetic filed supplied from a bias magnet. The magnetic field direction is changed by the tooth, which is detected by the element even when the gear is not rotated before the engine starts. To detect an exact angle of the gear, an additional magnetoresistance element positioned perpendicularly to the first element may be used. The gear tooth position is detected by the first element even when the gear is not rotated, and once the gear rotates, the second element detects an exact angular position of the gear.

Abstract: In the present invention, a detection coil and a cancellation coil are closely provided and electrically connected in series to cancel induction noise. The cancellation coil may be disposed at a position not to sense the rotation. An axis of the cancellation coil may be provided in parallel to an axis of the detection coil. The numbers of turns for the cancellation coil may be the same as those for the detection coils. The cancellation coil may be disposed coaxial to the detection coils.

Abstract: Rolling bearing including a stationary race 1, a rotating race 6, at least one row of rolling bodies 3 placed between the stationary race 1 and the rotating race 6, an encoder 23 secured to the rotating race 6 and concentric therewith, and a sensor 14 supported by a sensor carrier block 15 secured to the stationary race 1 and arranged facing and a small gap away from the encoder 23, the travel of which, during rotation, is detected by the sensor 14. The sensor carrier block 15 is secured to the stationary race 1 by a metal retainer 16 positioned with respect to the stationary race 1. The retainer 16 is positioned on a radial face 5 of the stationary race 1 of the rolling bearing and welded to this race.