Source: http://www.google.de/patents/US7950494
Timestamp: 2013-12-10 16:48:13
Document Index: 124641337

Matched Legal Cases: ['art 6', 'art 6', 'art 6', 'art 71', 'art 71', 'art 72', 'art 28', 'art 25', 'art 71', 'art 25', 'art 25', 'art 25', 'art 71', 'art 25']

Patent US7950494 - Torque detecting device and electric power steering apparatus using the same - Google PatenteSuche Bilder Maps Play YouTube News Gmail Drive Mehr » Erweiterte Patentsuche | Anmelden Erweiterte Patentsuche PatenteThere is provided a torque detecting device including: magnetic flux concentrating rings which locate on a magnetic circuit forming member provided in a rotating body to which a torque is exerted, the rings concentrating a magnetic flux generated by the member; a detecting part which detects the torque...http://www.google.de/patents/US7950494?utm_source=gb-gplus-sharePatent US7950494 - Torque detecting device and electric power steering apparatus using the same Ver�ffentlichungsnummerUS7950494 B2PublikationstypErteilung AnmeldenummerUS 11/992,829 Ver�ffentlichungsdatum31. Mai 2011Eingetragen27. Sept. 2006 Priorit�tsdatum30. Sept. 2005Auch ver�ffentlicht unterCN101278179A, CN101278179B, EP1970685A1, US20090057051, WO2007040109A1 Ver�ffentlichungsnummer11992829, 992829, US 7950494 B2, US 7950494B2, US-B2-7950494, US7950494 B2, US7950494B2 ErfinderToshiharu Ishihara, Yoshitomo Tokumoto, Naoki NakaneUrspr�nglich Bevollm�chtigterJtekt Corporation, Denso CorporationZitat exportierenBiBTeX, EndNote, RefManPatentzitate (37), Klassifizierungen (10), Juristische Ereignisse (1) Externe Links: USPTO, USPTO-Zuordnung, EspacenetTorque detecting device and electric power steering apparatus using the sameUS 7950494 B2 Zusammenfassung There is provided a torque detecting device including: magnetic flux concentrating rings which locate on a magnetic circuit forming member provided in a rotating body to which a torque is exerted, the rings concentrating a magnetic flux generated by the member; a detecting part which detects the torque to the rotating body based on a density of the magnetic flux concentrated by the rings; and a holding ring which holds the magnetic flux concentrating rings and the detecting part and includes an attachment portion attaching to a stationary substance, on a circumference of the holding ring. Both end faces of the holding ring in an axial direction of the holding ring are substantially parallel. The attachment portion includes a fitting groove into which a sealing ring, which seals a gap between the attachment portion and the stationary substance, fits.
a housing that encloses the torque detecting device;
magnetic flux concentrating rings which locate outside of a circumference of a magnetic circuit forming member provided in a rotating body to which a torque is exerted, the rings concentrating a magnetic flux generated by the magnetic circuit forming member;
a detecting part which detects the torque exerted to the rotating body based on a density of the magnetic flux concentrated by the rings; and
the housing includes a holding ring which holds the magnetic flux concentrating rings and the detecting part and includes an attachment part, which attaches to a stationary substance, on an outer circumference of the holding ring, wherein
both end faces of the holding ring in an axial direction of the holding ring are parallel to each other,
the attachment part includes a fitting groove in which a sealing ring, which seals a gap between the attachment part and the stationary substance, fits, and
both end faces of the housing in the axial direction of the holding ring are flat except for position of the fitting groove, respectively.
2. The torque detecting device according to claim 1, wherein the attachment part is provided with a flange between the both end faces.
a torque detecting device that comprises:
a first housing that encloses the torque detecting device;
the first housing includes a holding ring which holds the magnetic flux concentrating rings and the detecting part and includes an attachment part, which attaches to a stationary substance, on an outer circumference of the holding ring, wherein
the attachment part includes a fitting groove in which a sealing ring, which seals a gap between the attachment part and the stationary part, fits, and
both end faces of the first housing in the axial direction of the holding ring are flat except for positions of the fitting groove, respectively;
a second housing, as the stationary substance, which includes a through hole penetrating a circular tubular part, which accommodates the rotating body to fix the electric power steering apparatus, in a radial direction and allows the holding ring to be fitted through the through hole therein, the attachment part attaching to the second housing;
a steering operation shaft which connects to the rotating body;
a controlling part which drives an electric motor for assisting a steering operation, based on the torque detected by the torque detecting device; and
a reduction mechanism which transmits a rotating force of the electric motor to a steering mechanism.
an upper column which connects to a steering operation member; and
a lower column which fits to the upper column relative to which the lower column is capable of displacement in an axial direction thereof, a lower end of the lower column fitting to one end of the second housing to be fixed, wherein
the upper column and the lower column accommodate the steering operation shaft. Beschreibung
This application is national phase under 35 U.S.C. �371 of PCT International Application No. PCT/JP2006/319136 which has an international filing date of Sep. 27, 2006 and designated the United State of America.
[Patent Document 1] Japanese Patent Application Laid-Open No. 2003-149062 SUMMARY Problems to be Solved by the Invention However, in the torque detecting device of the Patent Document 1, a whole of the torque detecting device is inserted into the interior of the housing. Further, the device is fixed in the interior of the housing. Therefore, it is rather difficult to perform a fixing operation in which the torque detecting device is to be fixed at a precise position in an appropriate posture inside the housing. Thus, improvements have been desired.
FIG. 10 is a partially enlarged cross-sectional view of a conventional electric power steering apparatus including an improved torque detecting device.
A torque detecting device A includes two magnetic flux concentrating rings 5, 5 that concentrates a magnetic flux which a magnetic circuit forming member 4 generates. The two rings 5, 5 are spaced from each other in an axial direction thereof. Also, the two rings 5, 5 circumferentially locate outside the magnetic circuit forming member 4 that a first rotating body 2 and a second rotating body 3 have, which coaxially connect to each other via a torsion bar 1. The device also includes a detecting part 6 that detects a torque exerted to the first rotating body 2 based on a density of the flux concentrated by the magnetic flux concentrating rings 5, 5. The device also having a first housing that includes a holding ring 7 that holds the magnetic flux concentrating rings 5, 5 and the detecting part 6 and has an attachment part for attachment onto a stationary substance such as a second housing 25 in an outer circumference of the holding ring 7. The device also includes a detecting circuit substrate 9 that connects to the detecting part 6 via lead wires 8. Further, the magnetic circuit forming member 4 includes permanent magnets 41 attached to an outer circumference of the first rotating body 2. Also, the magnetic circuit forming member 4 includes two magnetic rings 42, 42 which locate outside the permanent magnets 41 and fit onto the second rotating body 3.
The holding ring 7 includes a ring part 71 having a through hole 71 a corresponding to an inner circumferential face of the magnetic flux concentrating rings 5, 5. The holding ring 7 also includes a polygonal cylinder portion 72, which is provided with a bottom, extending radially outward from a circumferential portion of the ring part 71 and having an accommodating portion 72 a and an attachment portion 72 b. They are molded with a synthetic resin material. In a circumferential portion of the polygonal cylinder part 72, the attachment portion 72 b has flanges 72 c, 72 c. Both end faces 7 a, 7 b of the holding ring 7 in an axial direction of the holding ring 7 are substantially parallel to each other, forming flat planes, and are not provided thereon with a certain convex portion such as a tip, boss, bank, bump and lump. A circumferential surface of the holding ring 7, which intervenes between the both end surfaces 7 a, 7 b, has a substantial U shape. The flanges 72 c, 72 c project at both end portions of the circumferential surface in a circumferential direction, in other words, at both side surface portions 7 c, 7 c between the both end surfaces 7 a, 7 b. The flanges 72 c, 72 c include insertion holes 72 d, 72 d through which tiny screws are to be inserted. An annular fitting groove 73 is provided along a whole circumference around the attachment portion 72 b including a vicinity of base portions of the flanges 72 c, 72 c. A sealing ring 10 fits into the fitting groove 73. The sealing ring 10 consists of an O-ring for sealing a gap between the attachment portion 72 b and the stationary substance. In addition, the fitting groove 73 is formed when molding the holding ring 7.
The torque detecting device A as described above is used for an electric power steering apparatus for a vehicle for example. The electric power steering apparatus includes a force transmitting shaft 21 (the second rotating body 3) that connects coaxially to a steering operation shaft (steering shaft) 20 via the torsion bar 1. The steering operation shaft 20 connects to a steering operation member as a steering wheel at an upper end thereof and connects to the first rotating body 2 at a lower end thereof. The apparatus also includes a housing 25 that surrounds the first rotating body 2 and the force transmitting shaft 21 and includes three bearings 22, 23, 24 rotatably supporting the first rotating body 2 and the force transmitting shaft 21. The apparatus also includes an electric motor for assisting a steering operation attached to the housing 25. The apparatus also includes a reduction mechanism 27 that transmits a rotational force from a driving shaft of the electric motor 26 to an output shaft 21 (the force transmitting shaft 21, the second rotating body 3). The apparatus also includes the torque detecting device A and a controlling part 28 having a microprocessor that is coupled to the detecting circuit substrate 9 of the torque detecting device A and a driving circuit of the electric motor 26. The apparatus also includes a lower column 29 accommodating the steering operation shaft 20. The lower column 29 fits onto an upper end of the housing 25 at a lower end thereof. The apparatus also includes an upper column 30 accommodating the steering operation shaft 20, which is supported by the upper column 30. The upper column 30 fits onto the lower column 29 relative to which the upper column 30 is capable of displacement in an axial direction thereof.
The circular tubular part 25 b, the through hole 25 d and the engagement groove 25 e define a slot for accepting the holding ring 7 to be fitted into the housing 25. The ring part 71 of the holding ring 7 is inserted into the circular tubular part 25 b through the through hole 25 d which penetrates the circular tubular part 25 b of the housing 25 in the radial direction. The magnetic flux concentrating rings 5, 5 are positioned in the circular tubular part 25 b by engagement of the ring part 71 with the engagement groove 25 e. The sealing ring 10 comes into contact with inner circumferential surface of the through hole 25 d to seal. The flanges 72 c, 72 c of the holding ring 7 attaches onto the attachment seats 25 c, respectively. After the attachment of the holding ring 7, the first rotating body 2 and the force transmitting shaft 21 are inserted into the circular tubular part 25 b in the axial direction of the housing 25. The permanent magnets 41 and the magnetic ring 42 are arranged inside the magnetic flux concentrating rings 5, 5.
Patentzitate Zitiertes PatentEingetragen Ver�ffentlichungsdatum Antragsteller TitelUS437605329. Sept. 19808. M�rz 1983Ambic Group LimitedMethod and system employing a filter-detector for detecting mastitis in cowsUS5195382 *15. Apr. 199123. M�rz 1993The Torrington CompanyDevice for measuring speed and torque on a shaftUS5578767 *6. M�rz 199626. Nov. 1996Nsk Ltd.Torque sensorUS5811695 *15. Juli 199722. Sept. 1998Nsk Ltd.Torque sensorUS6301975 *24. Febr. 199916. Okt. 2001Nsk Ltd.Torque sensor having improved reliability against thermal expansion and axial displacement of componentsUS6370966 *29. Jan. 199716. Apr. 2002Kayaba Kogyo Kabushiki KaishaInput torque detector for power steeringUS6644134 *21. Febr. 200211. Nov. 2003Visteon Global Technologies, Inc.Flux brush torque sensorUS688041120. Mai 200219. Apr. 2005Nippon Soken, Inc.Torque sensor and electric power steering system having sameUS6988422 *27. Jan. 200524. Jan. 2006Denso CorporationMagnetic torque sensor including integral sub-unitsUS70478249. Juni 200323. Mai 2006Nippon Soken, Inc.Electric power steering system having a torque sensorUS708980923. Febr. 200615. Aug. 2006Nippon Soken, Inc.Torque sensor and electric power steering system having sameUS7428847 *11. Jan. 200730. Sept. 2008Jtekt CorporationTorque detection deviceUS7509883 *7. Apr. 200531. M�rz 2009Jtekt CorporationTorque detecting apparatus and manufacturing method thereofUS2003004206512. Aug. 20026. M�rz 2003Koyo Seiko Co., Ltd.Electric power steering device equipped with anti-theft function and method for manufacturing sameUS2003016785727. Febr. 200311. Sept. 2003Kiyoshi SugimuraTorque sensorUS200502238207. Apr. 200513. Okt. 2005Favess Co., Ltd.Torque detecting apparatus and manufacturing method thereofUS20050247139 *19. Juli 200510. Nov. 2005Kiyoshi SugimuraMagnetic torque sensor including integral sub-unitUS20060021451 *29. Juli 20052. Febr. 2006Koyo Seiko Co., Ltd.Torque detecting apparatus and electric power steering apparatusUS20090241693 *30. M�rz 20091. Okt. 2009Kayaba Industry Co., Ltd.Torque sensor and manufacturing method thereofUS20100147620 *27. Sept. 200617. Juni 2010Jtekt CorporationTorque detection device and electric power steering apparatus using the sameJP2000310646A * Titel nicht verf�gbarJP2003072566A Titel nicht verf�gbarJP2003149062A Titel nicht verf�gbarJP2003329523A Titel nicht verf�gbarJP2004219340A Titel nicht verf�gbarJP2005226994A Titel nicht verf�gbarJP2005265581A Titel nicht verf�gbarJP2005265587A Titel nicht verf�gbarJP2005300267A Titel nicht verf�gbarJP2006071326A Titel nicht verf�gbarJP2007187589A * Titel nicht verf�gbarJPH10258749A * Titel nicht verf�gbarJPH10297507A Titel nicht verf�gbarJPH10324252A * Titel nicht verf�gbarJPH11248561A Titel nicht verf�gbarJPH11248564A * Titel nicht verf�gbarJPS5541896A Titel nicht verf�gbar* Vom Pr�fer zitiertKlassifizierungen US-Klassifikation180/444, 73/862.333, 73/862.331Internationale KlassifikationB62D5/04, G01L3/10 UnternehmensklassifikationG01L3/104, B62D6/10 Europ�ische KlassifikationG01L5/22B, G01L3/10A, B62D6/10Juristische Ereignisse DatumCodeEreignisBeschreibung28. M�rz 2008ASAssignmentOwner name: DENSO CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ISHIHARA, TOSHIHARU;TOKUMOTO, YOSHITOMO;NAKANE, NAOKI;REEL/FRAME:020780/0483;SIGNING DATES FROM 20080318 TO 20080326Owner name: JTEKT CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ISHIHARA, TOSHIHARU;TOKUMOTO, YOSHITOMO;NAKANE, NAOKI;SIGNING DATES FROM 20080318 TO 20080326;REEL/FRAME:020780/0483DrehenOriginalbildGoogle-Startseite - Sitemap - USPTO-Bulk-Downloads - Datenschutzerkl�rung - Nutzungsbedingungen - �ber Google Patente - Feedback gebenDaten bereitgestellt von IFI CLAIMS Patent Services.© 2012 Google