Permanent Magnet Type Patents (Class 324/174)
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Patent number: 7615993Abstract: To provide a magnetic line-type position-angle detecting device capable of detecting an absolute position on a non-contact basis and with high resolution and inexpensive construction, the magnetic line-type position-angle detecting device includes a magnetic line sensor 1 having a plurality of magnetic sensor elements 1a arranged in line, and a magnetic generating element 2 confronting the magnetic line sensor and movable in a direction conforming to the line of the magnetic sensor elements 1a. The magnetic sensor elements 1a of the magnetic line sensor 1 are sequentially selected by a scanning circuit 3, a signal from the selected sensor element 1a is processed into a digital signal through an amplifier 4, and an analog-to-digital converting circuit 5. By a calculation processing circuit 6, a distribution of magnetic fields applied to the magnetic line sensor 1 are measured to calculate the position and/or angle of the magnetic generating element 2.Type: GrantFiled: December 8, 2006Date of Patent: November 10, 2009Assignee: NTN CorporationInventor: Toru Takahashi
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Patent number: 7610998Abstract: A disc brake, especially for utility vehicles, which includes a caliper enclosing a brake disc, a pneumatically or electromotively operated tensioning device for tensioning the brake, which is located in the caliper, a magnet wheel rotating with the brake disc, and a stationary sensor for detecting the angle of rotation and the speed of the magnet wheel. The sensor is mounted at a distance from the magnet wheel and at least one line is connected to transmit pulses between the sensor and the magnet wheel. As a result, the sensor can be mounted on the housing protected from the action of heat and other environmental influences and so as to be easily accessible.Type: GrantFiled: April 24, 2006Date of Patent: November 3, 2009Assignee: Knorr-Bremse Systeme fuer Nutzfahrzeuge GmbHInventors: Johann Baumgartner, Guenther Gschossmann
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Patent number: 7608346Abstract: A magnetic field sensor, in particular an rpm sensor and/or rotational direction sensor and/or position sensor for the drive train of a motor vehicle, has a sensor array, with a sensor element that responds to a magnetic field, and optionally with a permanent magnet, the latter being sheathed with plastic jointly with the sensor array and parts of terminal conductor tracks, and the conductor tracks are embodied in one piece with a fixing element for the permanent magnet and the sensor array as a stamped grid, wherein stamped grid is shaped as a three-dimensional structure which carries the sensor array and optionally embraces the permanent magnet in the manner of a mount, and the mount and the terminal conductor tracks are first stamped out from a metal sheet as a gridlike developed form, and then deformed to form the mount.Type: GrantFiled: December 7, 2005Date of Patent: October 27, 2009Assignee: Robert Bosch GmbHInventors: Alexander Braun, Andreas Herzberger, Steffen Waldenmeier
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Publication number: 20090256551Abstract: The object is to produce even an magnetic encoder having a large outer diameter at a low cost, provide a sensor case which is compact in size and can be easily mounted and dismounted with a sensor element received therein, and to provide a double row rolling bearing with a preload application means and a rotational speed sensor which comprises a small number of parts and thus can be assembled easily. The magnetic member 12 of the magnetic encoder 11 is made of a magnetic material bound by rubber. The magnetic member 12 is bonded to an annular presser member 8 which also serves as a metal core by means of an adhesive 13, thus eliminating the need for a mold and other facilities for vulcanization bonding. This makes it possible to manufacture even a magnetic encoder 11 with a large outer diameter at a low cost.Type: ApplicationFiled: January 11, 2007Publication date: October 15, 2009Applicant: NTN CORPORATIONInventors: Hiroyoshi Ito, Seiichi Takada
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Publication number: 20090251133Abstract: A sensor holder has an encoder and a wheel speed sensor arranged opposite to the encoder, via a predetermined air gap. An annular fitting member is formed by pressing an anti-corrosive steel plate. A holding portion is formed of injection moldable synthetic resin and is integrally formed with the annular fitting member. The wheel speed sensor is embedded in the holding portion. At least a surface of the annular fitting member contacting the holding portion is roughened by shot blasting to have a surface roughness Ra of 0.8 or more.Type: ApplicationFiled: June 17, 2009Publication date: October 8, 2009Applicant: NTN CorporationInventors: Kikuo Fukada, Hiroshi Kawamura, Takayuki Norimatsu, Yujiro Ono, Syougo Suzuki
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Patent number: 7592799Abstract: A magnetic encoder includes a multipolar magnet, having magnetic poles formed therein so as to alternate with each other in a direction circumferentially thereof, and a core metal supporting the multipolar magnet. The multipolar magnet is prepared from a sintered element formed by sintering a powdery mixture of a magnetic powder and a non-magnetic metallic powder. This multipolar magnet is fixed to the core metal to form a unitary component made up of the sintered element and the core metal. The unitary component is subjected to a surface treatment for anticorrosion.Type: GrantFiled: September 10, 2004Date of Patent: September 22, 2009Assignee: NTN CorporationInventors: Tatsuo Nakajima, Kouya Oohira, Arito Matsui, Kazutoyo Murakami
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Patent number: 7592798Abstract: A magnet portion 27 of a magnetic encoder 26 includes a magnetic member and a resin, and a highly reliable magnetic encoder 26 having a high magnetic property and enabling to detect a rotational number with high accuracy, and a hub unit bearing 2a are provided. Further, the resin is preferably a thermoplastic resin and further preferably includes a thermoplastic resin including a soft segment in a molecule. Further, the magnetic encoder 26 further includes a fixed member 25 attached with the magnet portion 27 and comprising a magnetic material, and the magnet portion 27 and the fixed member 25 are bonded by an adhering agent including at least one of a phenolic resin based and an epoxy resin based.Type: GrantFiled: January 18, 2005Date of Patent: September 22, 2009Assignee: NSK Ltd.Inventors: Toshikazu Yabe, Takeshi Murakami, Nariaki Aihara, Toshimi Takajo
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Publication number: 20090195240Abstract: A pickup coil includes a sensing unit having an iron core, a permanent magnet magnetically coupled to a rear end position of the iron core, and a coil for sensing a change of magnetic flux occurring in the iron core; and a supporting frame member. The sensing unit is molded with a cup-shaped resin case. The sensing unit is integrally molded with the supporting frame member and is mounted on a mounting object via the supporting frame member. A plurality of weight units for adjusting a characteristic frequency of the coil is stored in a weight storage section formed inside the resin case at a position spaced away from the supporting frame member. The weight storage section is sized such that one or more weight units are accommodated therein.Type: ApplicationFiled: January 12, 2009Publication date: August 6, 2009Applicant: Honda Motor Co., Ltd.Inventor: Masaki Yamazaki
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Patent number: 7555402Abstract: The method consists in: determining in which actually sector the booster motor is located, a sector of the booster motor being defied by two successive poles; determining a relative angle position of the steering wheel in relation to the booster motor; identifying a sector, known as neutral, in which the booster motor is located when the rotation speeds of the rear wheels, i.e. right and left of the vehicle, are equal; determining an angle offset of the steering wheel corresponding to a neutral angle position of the steering wheel; determining an absolute angle position of the steering wheel which is equal to the difference between the relative angle position of the steering wheel and the offset angle thereof.Type: GrantFiled: September 16, 2005Date of Patent: June 30, 2009Assignee: JTEKT EuropeInventors: Julien Barthomeuf, Stephane Cassar, Andre Michelis
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Patent number: 7535215Abstract: An apparatus for the determination of a momentary relative direction of an indicator object depending on a magnetic field influenced or generated by the indicator object includes first means for sensing a course of a first magnetic field component of the magnetic field, second means for sensing a course of a second magnetic field component of the magnetic field, and means for evaluating the course of the first magnetic field component and the second magnetic field component in order to determine the momentary, relative direction of the indicator object, the first magnetic field component and the second magnetic field component being offset in angle with respect to each other.Type: GrantFiled: April 6, 2005Date of Patent: May 19, 2009Assignee: Infineon Technologies AGInventor: Bernhard Forster
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Patent number: 7508198Abstract: A shaft assembly, includes an elongated shaft and a flywheel mounted to an end of the shaft. An encoder is mounted to the shaft and includes an annular support ring having a radially inwardly extending portion and an axially extending portion extending from a radially outer end of the radially inwardly extending portion. The radially inwardly extending portion defines a spring section which is compressed between the flywheel and the end of the shaft, and an encoder material is disposed on the axially extending portion of the annular support ring.Type: GrantFiled: July 30, 2007Date of Patent: March 24, 2009Assignee: Freudenberg-NOK General PartnershipInventors: Rory S. Pawl, Chad D. Bauer
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Patent number: 7508193Abstract: To easily manufacture an encoder, in which N-poles and S-poles of magnets are arranged alternately in a circumferential direction and in which an unequal pitch portion is provided in a part on a circumference, without using a magnetizing head of a special shape having an unequal pitch portion, the unequal pitch portion is formed by arranging the N-poles and the S-poles at an equal pitch all over the circumference and then providing a part on the circumference with a shielding member for shielding a magnetism. Alternatively, the unequal pitch portion is formed by arranging the N-poles and the S-poles at an equal pitch all over the circumference and then providing a part on the circumference with a cut portion.Type: GrantFiled: April 14, 2005Date of Patent: March 24, 2009Assignee: NOK CorporationInventors: Kenichi Yarimizu, Shinji Nagasawa, Yoshiaki Ono, Naoto Kobayashi
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Patent number: 7508199Abstract: A printed circuit board on which are laid out detection windings and an excitation magnetic flux detection winding formed of conductor patterns is disposed so as to be spaced a predetermined gap quantity from a binary cyclic random number sequence code plate which is rotatably disposed. A U-shaped exciting core on which an excitation winding is wound is disposed on the back surface side of the printed circuit board. The detection windings detect and output, as voltage values, reluctance changes as which excitation magnetic fluxes generated from the excitation winding fluctuate between this excitation winding and the concave/convex portion of the binary cyclic random number sequence code plate. Reduction of precision due to interferences between the excitation magnetic fluxes for detecting an absolute code and other excitation magnetic flux is thereby prevented.Type: GrantFiled: March 13, 2008Date of Patent: March 24, 2009Assignee: Okuma CorporationInventors: Yasukazu Hayashi, Noriyuki Fukui
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Patent number: 7495432Abstract: An angle detection apparatus includes a rotation member including at least one north magnetic polar region and at least one south magnetic polar region alternately arranged around a rotation center, a magnetic field detecting portion having a magnetic plate and detecting elements detecting magnitudes of magnetic components in a direction perpendicular to the magnetic plate, and a computing unit determining a rotation angle of the rotation member, wherein the magnetic field detecting portion is disposed so that the magnetic plate is oriented perpendicular to a first direction, where magnetic field intensity is at its maximum, and the magnetic field detecting portion detects the magnitudes of the magnetic components in the first direction and a second direction corresponding to a direction that the north and south magnetic polar regions are circumferentially arranged.Type: GrantFiled: April 22, 2008Date of Patent: February 24, 2009Assignee: Aisin Seiki Kabushiki KaishaInventors: Yukihiro Kato, Masashi Momiyama, Noriaki Fujita
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Patent number: 7490700Abstract: A bicycle motion sensing arrangement is provided has a bicycle wheel, a bicycle brake and a sensor. The bicycle wheel includes an air valve stem and a magnet mounted to the air valve stem. The bicycle brake is configured to be mounted to a bicycle frame. The sensor is fixedly attached to the bicycle brake at a location to detect rotational behavior of a bicycle wheel by sensing the magnet mounted to the air valve stem.Type: GrantFiled: June 2, 2005Date of Patent: February 17, 2009Assignee: Shimano Inc.Inventor: Etsuyoshi Watarai
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Patent number: 7489127Abstract: The invention relates to a measuring system for contactless detection of a rotational angle, having a first body on which at least one magnet is disposed and having at least one magnetic-field-sensitive element, supported by a second body, for generating a measurement signal, the first body and the second body being rotatable counter to one another about an axis of rotation, and the magnet having a blind-borelike recess. The invention provides that the at least one magnetic-sensitive element protrudes at least partway into the recess.Type: GrantFiled: March 25, 2008Date of Patent: February 10, 2009Assignee: Robert Bosch GmbHInventors: Bernhard Bauer, Matthias Zeh, Bernd Koeberle, Thomas Klotzbuecher
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Patent number: 7481400Abstract: A sensor for detecting the presence of wheels of a rail vehicle includes first and second Hall Effect devices, a magnet for supplying a magnetic field to the first and second Hall Effect devices, the first and second Hall Effect devices and the magnet being mounted adjacent to the rail, whereby a railway vehicle wheel changes the magnetic field in the Hall Effect devices to produce wheel indication signals, and a processing circuit for receiving the wheel indication signals from the first and second Hall Effect devices and for producing an output signal in response to the wheel indication signals. A method of detecting the presence of a wheel is also provided.Type: GrantFiled: July 1, 2005Date of Patent: January 27, 2009Assignee: Portec, Rail Products Ltd.Inventors: Glen Appleby, Stephen W. Brown, Kostas Papazoglou
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Patent number: 7471080Abstract: In the magnetic absolute encoder, an ordinary operating circuit and an ordinary/backup operating circuit are actuated during ordinary operation in which power is supplied from the ordinary operating power supply; the single-rotation absolute value (1) and single-rotation absolute value (2) detected by these circuits are compared by the abnormality diagnosis circuit, and the presence or absence of an abnormality is automatically judged During backup in which the ordinary operating power supply is interrupted, only the low-power-consumption ordinary/backup operating circuit is actuated, and the multiple-rotation value (2) is detected At the point in time at which the system is returned to ordinary operation, the multiple-rotation value setting circuit sets the multiple-rotation value (2) as the multiple-rotation value (1) of the ordinary operating circuit. As a result, the calculation operation of the multiple-rotation value (1) can be restarted.Type: GrantFiled: December 7, 2007Date of Patent: December 30, 2008Assignee: Harmonic Drive Systems Inc.Inventors: Kozo Sasaki, Toshiki Maruyama, Toshiyuki Abe, Muneo Mitamura
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Publication number: 20080313886Abstract: A method and an apparatus for magnetizing an object, a method and an apparatus for calibrating a force and torque sensor device, a use of an apparatus for magnetizing an object in particular fields, and a use of an apparatus for calibrating a force and torque sensor device in particular fields. A method for magnetizing a first object and/or a second object comprises the steps of arranging a first object in such a manner that the first object encloses a second object, and applying a first electrical signal to the second object, wherein the first electrical signal is adapted such that at least a portion of the first object and/or of the second object is magnetized.Type: ApplicationFiled: December 29, 2004Publication date: December 25, 2008Inventor: Lutz May
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Patent number: 7468604Abstract: A magnetic detector, wherein the magnetic/electric conversion element is constituted by at least six segments symmetrically arranged in a direction in which the magnetic moving body rotates maintaining a predetermined pitch with respect to the center line of the magnet, first and second bridge circuits are constituted so as to produce outputs accompanying the rotation of the magnetic moving body, and a third bridge circuit is constituted so as to produce an output accompanying the rotation of the magnetic moving body, and wherein a comparison level of a comparator circuit that shapes the waveform of a differential output signal of the first and second bridge circuits is adjusted relying upon an output signal of the third bridge circuit.Type: GrantFiled: December 27, 2006Date of Patent: December 23, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Masahiro Yokotani, Naoki Hiraoka
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Publication number: 20080309322Abstract: A wheel speed detector for detecting a relative rotating speed between an outer ring and an inner ring by means of a magnetic sensor in association with a magnetic ring. A stationary seal member is fixed to the stationary ring and a rotatable seal member is fixed to the rotatable ring. The seal members engage to seal a gap between the inner ring and the outer ring. The magnetic sensor is fixed to a radial inner surface of the stationary seal member and the magnetic ring is fixed to a radial outer or a radial inner surface of the rotatable seal member and surfaces of the magnetic ring other than that fixed to the radial inner surface of the rotatable seal member are covered with a seal lip.Type: ApplicationFiled: August 27, 2007Publication date: December 18, 2008Applicant: KOYO SEIKO CO., LTD.Inventors: Minoru Sentoku, Motoshi Kawamura, Kazutoshi Toda, Nobuyuki Seo, Naoki Morimura, Tomohiro Ishii, Kanichi Kouda, Yoshifumi Shige, Fujio Harumi
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Patent number: 7466123Abstract: A rotation sensor for outputting a pulse signal, which has a frequency corresponding to a rotation speed of a rotor, to a wire. The rotation sensor includes a modulation unit and an output unit. The modulation unit modulates an information signal representing information other than the rotation speed into a carrier wave having a frequency higher than the frequency of the pulse signal. The output unit superimposes and outputs to the wire the pulse signal and the carrier wave. Accordingly, the rotation sensor performs stable information transmission that is not dependent on the rotation speed of the rotor.Type: GrantFiled: February 21, 2005Date of Patent: December 16, 2008Assignee: Aisin Seiki Kabushiki KaishaInventors: Manabu Kato, Eiji Fujioka
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Patent number: 7459905Abstract: A rotation detector is positioned to face a rotating object such as a crankshaft of an internal combustion engine. The rotation detector includes a sensor chip mounted on a portion extending from a holder and a magnet for supplying a biasing magnetic field to the sensor chip. Rotation of the rotating object is detected by sensing changes in the magnetic field in which the sensor chip is positioned. A projection is formed on an end surface of the holder while a depression is formed on an end surface of the magnet, and the projection and the depression are tightly engaged with each other to thereby correctly position the magnet relative to the holder. In this manner, the sensor chip is correctly and accurately positioned relative to the biasing magnet. Thus, deviations in rotation detection are minimized, and detection accuracy of the detector is improved.Type: GrantFiled: September 28, 2006Date of Patent: December 2, 2008Assignee: DENSO CORPORATIONInventor: Norihiro Kurumado
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Patent number: 7458727Abstract: The invention relates to a seal arrangement for sealing off at least one radial interspace between at least one bearing ring which can rotate and at least one rotationally fixed bearing ring. The seal arrangement is provided with at least a first carrier, the first carrier carrying at least one resilient seal and being fixed to a rotationally fixed bearing ring, and a second carrier, the second carrier being fixed to the bearing ring that can rotate and carrying at least one encoder. The encoder has an outwardly oriented circumferential surface in the shape of a truncated circular cone.Type: GrantFiled: May 25, 2006Date of Patent: December 2, 2008Assignee: Schaeffler KGInventors: Peter Niebling, Jens Heim, Heinrich Hofmann, Darius Dlugai, Roland Langer
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Patent number: 7455459Abstract: An oil lubricated rotating hub (14) and stationary spindle (12) assembly includes an oil bath seal (16, 16?) for establishing a dynamic sealing interface between the hub (14) and spindle (12). A wheel sensor assembly includes a variable reluctance senor (54) targeted at an encoder ring (56, 56?) which is integrated into the oil bath seal (16, 16?). The encoder ring (56, 56?) is of the permanent magnet type including a plurality of magnetically polarized sectors alternating between North and South polarities. The use of an encoder style target (56, 56?) in combination with a variable reluctance sensor (54) enables improved slow speed sensing with relatively large air gap spacing between the exposed (58, 58?) of the encoder ring (56, 56?) and the head of the VR sensor (54). Furthermore, the encoder ring (56, 56?) enables use of less expensive, lighter materials for the oil bath seal carrier (20, 20?).Type: GrantFiled: March 9, 2006Date of Patent: November 25, 2008Assignee: Federal Mogul World Wide, Inc.Inventors: David M Toth, Gerald A Greca, Michael J Anderson
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Patent number: 7453262Abstract: A rotational speed detecting sensor includes a detecting portion having a detecting member provided facing a magnetized portion to be detected, the detecting portion for detecting variations of a magnetic flux generated by a rotation of the portion to be detected, a fix portion for fixing the detecting member, the fix portion being formed by means of molding and a case, a first end of which is closed and a second end of which is opened. The case includes a housing portion recessed toward the first end of the case from an opening portion side of the case, the housing portion for housing the detecting member, and a positioning portion for restricting a movement of the case in a mold in a direction toward the opening portion side of the case from the first end of the case.Type: GrantFiled: January 9, 2006Date of Patent: November 18, 2008Assignee: Aisin Seiki Kabushiki KaishaInventors: Koji Kawasaki, Masahiro Kimura, Eiichiro Iwase
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Patent number: 7452133Abstract: A sensor-integrated wheel support bearing assembly for rotatably supporting a vehicle wheel relative to a vehicle body structure has an outer member having an inner peripheral surface formed with a plurality of raceway surfaces, an inner member having an outer peripheral surface formed with raceway surfaces in alignment with the raceway surfaces in the outer member, a plurality of rows of rolling elements interposed between the raceway surfaces in the outer member and the raceway surfaces in the inner member, respectively, and a load sensor. The load sensor is disposed in one of the outer and inner members, which forms a stationary member. The outer member has an outer periphery formed with a vehicle body fitting flange. The load sensor for detecting a load acting on the vehicle wheel by detection of a load acting on the vehicle body fitting flange is disposed in the vehicle body fitting flange.Type: GrantFiled: April 30, 2004Date of Patent: November 18, 2008Assignee: NTN CorporationInventors: Hisashi Ohtsuki, Hideo Shinagawa, Kenichi Iwamoto, Koichi Okada
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Patent number: 7441322Abstract: A magnetic detection apparatus can be improved in its product yield. The magnetic detection apparatus includes a resin compact having a the magnet arranged in opposition to an object to be detected for generating a magnetic field, an IC chip with a magnetic detection part built therein for detecting a change in the magnetic field in accordance with movement of the object to be detected, and an IC package in which a lead frame having the IC chip installed thereon is sealed with a resin. A method for manufacturing such a magnetic detection apparatus includes a signal adjustment step for adjusting a signal generated from the magnetic detection part in a state in which the magnetic field is applied to the magnetic detection part to correct a deviation of the signal of the magnetic detection part generated in accordance with a relative displacement between the magnetic detection part and the magnet.Type: GrantFiled: September 28, 2006Date of Patent: October 28, 2008Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Izuru Shinjo, Shigeki Tsujii, Yoshinori Tatenuma, Hiroshi Sakanoue, Masahiro Yokotani, Ryouichi Sasahara
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Patent number: 7438159Abstract: A bicycle motion sensing arrangement is provided has a bicycle wheel, a bicycle brake and a sensor. The bicycle wheel includes an air valve stem and a magnet mounted to the air valve stem. The bicycle brake is configured to be mounted to a bicycle frame. The sensor is fixedly attached to the bicycle brake at a location to detect rotational behavior of a bicycle wheel by sensing the magnet mounted to the air valve stem.Type: GrantFiled: May 16, 2007Date of Patent: October 21, 2008Assignee: Shimano Inc.Inventor: Etsuyoshi Watarai
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Patent number: 7436172Abstract: An angular speed detecting device is composed of a magnetic sensor unit connected to a rotating object and including a permanent magnet and a pair of magnetic sensor elements to generate a pair of signals and an electric computing unit that calculates an angular speed from the signals. The electric computing unit calculates the angular speed by the following steps: forming sine and cosine functions of an angle ?? from the signals; forming a saw-tooth curve of the angle ??; forming a table showing plus or minus sign of the signals and the saw-tooth curve of the angle ?? at a plurality of rotation angles of the rotating object; forming a pair of curves of output angles ?1 and ?2 in terms of 360-degree angular range by distinguishing rotation position of the rotating object from a combination of the plus, or minus sign of the signals and the saw-tooth curve of the angle ??; and selectively using curves of the output angles ?1 and ?2 to calculate the angular speed of a rotating object.Type: GrantFiled: April 19, 2005Date of Patent: October 14, 2008Assignee: Denso CorporationInventors: Koichiro Matsumoto, Tatsuya Kitanaka
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Publication number: 20080246465Abstract: In order to create a magnetoresistive speed sensor (100) with a permanent magnet (10) and with a sensor (A, B) for a magnetic field for detecting the speed of an object rotating about an x-axis, wherein the magnetoresistive speed sensor (100) is equipped with a measuring direction (ME), in which an external magnetic interference field does not influence the measurement result, it is proposed that the measuring direction (ME) is aligned to be parallel with an x-direction and that two sensors (A, B) are disposed with displacement from one another and normal to the measuring direction (ME).Type: ApplicationFiled: December 20, 2004Publication date: October 9, 2008Inventor: Stefan Butzmann
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Publication number: 20080218156Abstract: A magnetic encoder includes a metallic reinforcing ring and a magnetic ring attached to the metallic reinforcing ring, and is composed of a mixture of an elastic element and a magnetic material. A front side of the magnetic ring is formed into a roughly uneven surface having a roughness of Ra 0.2 to 10.0 or Ry 2 to 100.0.Type: ApplicationFiled: May 14, 2008Publication date: September 11, 2008Inventor: Masanori TOMIOKA
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Patent number: 7423420Abstract: A sensor, preferably for magnetic rotary or linear sensor systems, includes a scale situated at a specified distance from the sensor, and having at least one magnetic field-sensitive GMR sensor element provided in a housing, the housing also having one magnetic field source respectively associated with the at least one GMR sensor element, the magnetic field source being accommodated in a shield enclosing same in a U-shape, and the magnetic field source, the at least one GMR sensor element, and/or the housing being tilted at a specified distance and by a predetermined angle relative to the reference plane of the scale.Type: GrantFiled: July 19, 2006Date of Patent: September 9, 2008Assignee: Woelke Magnetbandtechnik GmbH & Co. KGInventor: Stephan Meyersweissflog
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Publication number: 20080180090Abstract: A first magnetic sensor is formed on a semiconductor substrate, and the first magnetic sensor produces a first output signal in response to movement of a multi-pole magnet. A second magnetic sensor is formed on the semiconductor substrate so as to be intertwined with the first magnetic sensor and so as to be at a predetermined angle with respect to the first magnetic sensor. The second magnetic sensor produces a second output signal in response to movement of the multi-pole magnet. The predetermined angle is between 0° and 180° exclusive, and the predetermined angle is sufficient to produce a difference in phase between the first and second output signals. An output signal converter converts the first and second output signals to a linear signal.Type: ApplicationFiled: February 22, 2007Publication date: July 31, 2008Inventors: Joel D. Stolfus, Jason M. Chilcote
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Publication number: 20080180089Abstract: A first magnetic sensor produces a first output signal in response to movement of a target such as a multi-pole ring magnet, and a second magnetic sensor produces a second output signal in response to movement of the target. The first and second magnetic sensors may be corresponding magnetoresistor sensors, the first and second magnetic sensors may be intertwined, the first and second magnetic sensors may be oriented at an angle with respect to one another so as to produce a difference in phase between the first and second output signals, the first and second magnetic sensors may be arranged so as to produce a 90° phase difference between the first and second output signals, and/or the first and second magnetic sensors may be formed on a semiconductor substrate.Type: ApplicationFiled: January 29, 2007Publication date: July 31, 2008Inventors: Joel D. Stolfus, Jason M. Chilcote
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Patent number: 7404333Abstract: Sensor head or detector head (1) composed primarily of a protective casing that forms a hollow body (2) with an external surface, the so-called active surface (2?), and of a sensing or detection element mounted in the hollow body and adjacent to part of the front wall of the protective casing defining the active surface, at the level of the internal surface opposite the latter, the sensor head characterized in that the sensing element (3) is located at a distance from the internal surface (4?) of the part of the wall (4) of the hollow body (2) in such a way as to delineate an interstitial space (5) of small thickness (d) forming a mechanical and physical decoupling interface between the part of the wall (4) and the sensing element (3).Type: GrantFiled: March 24, 2005Date of Patent: July 29, 2008Assignee: SenstronicInventors: Manuel Kesseler, Rémy Kirchdoerffer
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Patent number: 7394242Abstract: A tachometer for an aircraft wheel mounted on an axle to rotate about an axis of rotation. The tachometer has a stationary part secured to the axle and a rotary part driven in rotation by the wheel. The stationary part and the rotary part are mountable independently on the axle and on the wheel, respectively, and have portions facing each other in a radial direction. A sensor and a target element carried by the stationary and rotary parts portions that extend facing each other in a radial direction and are in register with each other in a radial direction. The portion secured to the rotary part extends inside the axle.Type: GrantFiled: December 14, 2005Date of Patent: July 1, 2008Assignee: Messier-BugattiInventors: Jean-Clair Pradier, Thomas Lavaud
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Patent number: 7392713Abstract: A sensing system for monitoring a property of an electrically conductive moving element of turbomachinery. The sensing system includes a sensing system housing. A magnetic core is contained within the sensing system housing. A coil is positioned about at least a portion of the core. The coil is electrically connectable to a property data analysis device. A first magnet and a second magnet are positioned about the coil and positionable proximate a moving element of turbomachinery to be monitored. A primary magnetic field is generated by the first and second magnets. When the moving element enters the primary magnetic field a current is induced in the moving element, thus generating a time-variable magnetic field and commensurate voltage signal generated in the coil. The voltage signal is amplified by the magnetic core and provides an indication of a property of the moving element.Type: GrantFiled: September 30, 2002Date of Patent: July 1, 2008Assignee: United Technologies CorporationInventor: Sarkis Barkhoudarian
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Patent number: 7388368Abstract: The object of the invention relates to an encoder for a position sensor, including at least one junction (J) between one so-called small pole (P) and one so-called large pole (G), having an angular width larger than the angular width of the small pole, the small pole (P) and the large pole (G) corresponding to each junction (J) having polarities of opposite signs, characterized in that, for each junction (J), the large pole (G) of a given sign consists: of at least one small stabilizing pole (ps) of the same sign placed adjacent to the small pole (P) of opposite sign and having an angular width substantially identical with that of said first pole, one the one hand and of at least one complementary pole (pc) of the same sign as the stabilizing pole (ps), the complementary pole (pc) and/or the small stabilizing pole (ps) having a gradual magnetization profile adapted for stabilizing the passing through zero gauss of the radial component of the magnetic induction, on the other hand.Type: GrantFiled: May 14, 2007Date of Patent: June 17, 2008Assignee: Electricfil AutomotiveInventors: Bertrand Legrand, Jérôme Corona
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Patent number: 7385388Abstract: An encoder comprising a sleeve for holding on a shaft and an encoder element secured to the sleeve. The encoder element presents an encoding zone that is protected by a thin layer of material deposited by plasma directly on the encoder element and secured thereto, the thin layer covering at least the encoding zone A device including the encoder and a method of fabricating the encoder are described.Type: GrantFiled: March 30, 2006Date of Patent: June 10, 2008Assignee: HutchinsonInventors: Laurent Guerbe, Victor Zarife
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Patent number: 7377160Abstract: A sensor arrangement (1) for a tachometric sensor of an automatic transmission (4) of a motor vehicle, which encompasses a module carrier (2) in which a part of a sensor housing (3) is integrated. The sensor housing (3) is secured in the module carrier (2) or in the transmission housing (4) by way of a guide in the plane and is so affixed as to prevent turning and an apparatus (5) for the generation of a prestress force by way of which the sensor housing (3) is pressed in the direction of the signal disk by way of a projection (8, 8?) acting against the sensor housing (3).Type: GrantFiled: May 9, 2006Date of Patent: May 27, 2008Assignee: ZF Friedrichshafen AGInventors: Ralph Böhm, Gerhard Birkenmaier, Jörg Kurth
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Patent number: 7374343Abstract: To provide a magnetic encoder which can be assembled having a thin-walled structure while securing an excellent detection sensitivity and which can provide an excellent moldability by suitably selecting materials, the magnetic encoder is provided which includes a multi-pole magnet 14 having a plurality of opposite magnetic poles alternating in a direction circumferentially thereof, and a core metal 11 for supporting the multi-pole magnet. The multi-pole magnet 14 contains a powdery magnetic material mixed in an amount within the range of 20 to 90 vol. % relative to the total volume of the multi-pole magnet 14. The multi-pole magnet 14 may be a sintered magnet.Type: GrantFiled: February 19, 2004Date of Patent: May 20, 2008Assignee: NTN CorporationInventors: Tatsuo Nakajima, Kouya Oohira, Arito Matsui, Kazutoyo Murakami
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Patent number: 7372253Abstract: A sensor for measuring the rotational speed of a turboshaft of a turbocharger includes a sensor housing and a sensor element which is positioned in the sensor housing and which senses a variation of a magnetic field caused by the rotation of the turboshaft. In order to provide a sensor for measuring the rotational speed of a turboshaft which can be produced simply and at low cost and also can be integrated in a turbocharger without major structural modifications, the sensor element can be positioned outside the turbocharger, on or in a compressor housing, and a pole piece is arranged on the sensor element in such a way that it concentrates the magnetic field in the sensor element.Type: GrantFiled: June 26, 2006Date of Patent: May 13, 2008Assignees: Siemens Aktiengesellschaft, Siemens VDO AutomotiveInventors: Peter Biber, Markus Gilch, Jean-Louis Roux, Antoine Simonnet
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Patent number: 7370540Abstract: Rotation angle sensor, in particular for an electrical steering system of an industrial truck, in which two magnetic field sensitive sensor elements are arranged on orthogonal axes and a permanent magnet is attached to a shaft extending through the axis intersection point and the output signals X, Y of the sensor elements are given to an evaluation unit, which determines from the two output signals X, Y the rotation angle value by means of a function saved in the evaluation unit, characterized in that for a plurality of predetermined values of one of the output signals X or Y associated ideal values calculated from the geometrical relationship of the sensors of the other output signal Y, X are saved in the evaluation unit, the measured values of the other output signal Y, X are compared with the ideal values and a warning or stop signal is created if the difference between the measured and ideal value reaches a predetermined amount.Type: GrantFiled: June 1, 2006Date of Patent: May 13, 2008Assignee: Jungheinrich AktiengesellschaftInventors: Robert Hammerl, Frank Manken, Christoph Weber
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Publication number: 20080084202Abstract: A vehicular rotation speed sensing apparatus contains a base, a spindle pivoted inside the base, whose one end is mounted to a magnetic force device axially. The vehicular rotation speed sensing apparatus further includes a magnetic force sensor mounted along the axial direction of the spindle and fastened on the base, so as to sense the variation of the magnetic field lines of the magnetic force device. The magnetic force device is located between the spindle and the magnetic force sensor and the spindle rotates in the spindle hole by inserting the spindle in the spindle hole on the wheel base of motorcycle.Type: ApplicationFiled: October 6, 2006Publication date: April 10, 2008Inventor: Chen Chieh Shing
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Patent number: 7345469Abstract: A vehicle axle assembly having an axle housing, an axle shaft and a sensor. The axle housing has a tubular portion. A flat is formed on an annular wall of the tubular portion proximate a distal end of the tubular portion. A hole, which intersects the flat, is formed through the tubular portion. The axle shaft can have an integrally formed target portion that includes a plurality of teeth. The sensor is mounted in the hole and abuts the flat to space a tip of the sensor apart from the teeth of the target portion by a predetermined distance.Type: GrantFiled: March 5, 2007Date of Patent: March 18, 2008Assignee: American Axle & Manufacturing, Inc.Inventor: Blair J. Swansno
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Patent number: 7341257Abstract: A shaft seal/position sensor module assembly includes a carrier body that is mountable on a shaft housing about an opening through which a rotatable shaft extends. A sleeve is mountable on the shaft and carries a multi-pole encoder ring having a radially outwardly facing sensor surface. A magneto-resistive sensor is mounted on said carrier body in position to communicate with said sensor surface of said encoder ring.Type: GrantFiled: April 15, 2005Date of Patent: March 11, 2008Assignee: Federal-Mogul World Wide, IncInventors: David M. Toth, Richard E. Dewald, Bhawani Tripathy
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Patent number: 7336067Abstract: Balls are interposed between respective raceway surfaces of inner and outer ring members, and a seal apparatus is provided between shoulder portions of the inner and outer ring members. The seal apparatus comprises an outer ring-side seal ring fixed to the outer ring member, and an inner ring-side seal ring fixed to the inner ring member. A pulser ring is fixed to a ring-shaped core metal of the inner ring-side seal ring. In an outer diameter side of the ring-shaped core metal of the outer ring-side seal ring, a magnetic sensor is molded with resin by an external member to be integrated therein. A connector connected to the magnetic sensor is formed consecutive with the external member.Type: GrantFiled: February 3, 2004Date of Patent: February 26, 2008Assignee: JTEKT CorporationInventors: Masahiro Inoue, Shunichi Matsui, Yoshifumi Shige, Minoru Sentoku, Katsura Koyagi
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Patent number: 7323865Abstract: A device for determining the angular position and rotation speed of a rotary member. The inventive device includes a sensor having a fixed part and a rotary part which is linked to the rotary member. The rotary part bears a magnetic flux generator, while the fixed part includes: a first probe which generates an electric signal having two different levels as a function of the angular position of the rotary member; and a second probe which is angularly offset in relation to the first probe and which generates an electric signal as a one-way function of the angular position of the rotary member for each segment of revolution corresponding to a level of the electric signal generated by the first probe. Analysis elements having elements for unequivocally defining the angular position of the rotary member, and for calculating the rotation speed of the rotary member are provided.Type: GrantFiled: August 18, 2004Date of Patent: January 29, 2008Assignee: Siemens VDO AutomotiveInventors: Willem Teulings, David Raynaud
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Patent number: 7323864Abstract: An angular position sensor includes a rotating part (14) which creates a variable magnetic flux, a fixed part (16) for supporting two probes (22, 26) each having an output current, the first (22) of the probes having an output current having discontinuities when the magnetic flux passes through zero, the second (26) of the probes being subjected to a second magnetic flux, shifted by 90° relative to the first flux and having an output current that is a continuous function of the magnetic flux, and a device (30) for adding the currents from the two probes. The range of variation of the current from the first probe (22) is slightly larger than the range of variation of the current from the second probe (26). The sensor is applicable to engine camshafts.Type: GrantFiled: May 13, 2004Date of Patent: January 29, 2008Assignee: Siemens VDO AutomotiveInventors: Willem Teulings, Jeroen Van-Est