Patents Assigned to JTEKT
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Publication number: 20120097473Abstract: A motor vehicle steering system includes a steered shaft inserted through a tubular housing and a screw shaft provided on the intermediate portion of the steered shaft. A ball nut threadably engaged on the screw shaft via balls is driven to rotate by electric motors. A first bushing and a second bushing held by the housing support the first end portion and the second end portion of the steered shaft slidably in the axial direction, respectively. The central axis of the intermediate portion of the steered shaft is offset from the central axis of the first end portion and the central axis of the second end portion of the steered shaft. The central axis of the ball nut and the central axis of the intermediate portion of the steered shaft match each other.Type: ApplicationFiled: October 17, 2011Publication date: April 26, 2012Applicant: JTEKT CORPORATIONInventor: Takashi TASHIRO
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Publication number: 20120097474Abstract: A gap adjustment mechanism that moves an upper housing in a direction close to a worm is disposed in a fitting portion between the upper housing and a lower housing. The gap adjustment mechanism is disposed in the fitting portion on the side of the worm or in the fitting portion on the other side of the worm.Type: ApplicationFiled: October 18, 2011Publication date: April 26, 2012Applicant: JTEKT CORPORATIONInventor: Satoshi SETSUDA
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Publication number: 20120097471Abstract: A hydraulic power steering apparatus assists in steering of a vehicle with a hydraulic cylinder. The hydraulic power steering apparatus includes a flow control valve, a steering torque sensor, a steering angle sensor, a vehicle speed sensor, and an ECU. The flow control valve changes the supply/drainage amount of hydraulic fluid for the hydraulic cylinder. The ECU sets a supply/drainage mode for supplying/draining the hydraulic fluid with respect to the hydraulic cylinder based on detection results from the aforementioned sensors and controls the flow control valve in accordance with the supply/drainage mode of the hydraulic fluid.Type: ApplicationFiled: October 14, 2011Publication date: April 26, 2012Applicant: JTEKT CORPORATIONInventors: Masahiko SAKAMAKI, Yasuhiro TOMAGOU, Akihiko SHIINA, Tetsuya OZAKI, Ryouichi KUBO
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Publication number: 20120100949Abstract: A planetary gear mechanism of the invention includes a housing, an input shaft that has an eccentric portion whose center lies on an eccentric axis, and is rotatable about the axis of input and output shafts relative to the housing, an oscillating face plate that eccentrically oscillates relative to the input shaft via the eccentric portion, and rotates about the eccentric axis, and an output shaft that is provided with a second internally toothed gear that internally contacts and meshes with a second externally toothed gear formed on the oscillating face plate, and is rotatable about the axis of the input and output shafts relative to the housing. The housing is formed with a first internally toothed gear that internally contacts and meshes with a first externally toothed gear formed on the oscillating face plate.Type: ApplicationFiled: June 9, 2010Publication date: April 26, 2012Applicant: JTEKT CORPORATIONInventors: Kouji Nagumo, Hiromichi Ota, Tomohiro Honda, Yoshiharu Suzuki, Yoshinobu Katoh
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Publication number: 20120098379Abstract: A motor formed as a 10-pole 12-slot brushless motor includes: six delta-connected coils that are among twelve motor coils, and arranged in a circular pattern such that any two of the delta-connected coils, which are next to each other in the circumferential direction, are different in winding direction; and six star-connected coils that the remaining six motor coils, and arranged between the delta-connected coils by connecting one ends of the star-connected coils to respective six connection lines providing connection between the delta-connected coils such that any two of the star-connected coils, which are next to each other in the circumferential direction, are different in winding direction. Terminals of the star-connected coils are grouped into sets each including three terminals that are next to each other in the circumferential direction, and three-phase driving voltages are applied to the other ends of the star-connected coils in each set.Type: ApplicationFiled: October 21, 2011Publication date: April 26, 2012Applicant: JTEKT CORPORATIONInventor: Shigetoshi YAMAGUCHI
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Patent number: 8162763Abstract: An intermediate member is rockably provided around an outer periphery of a corresponding one of tripod shaft portions. Shaft-like rolling elements are retained by corresponding retainers so that the shaft-like rolling elements are able to circulate around the corresponding intermediate members and are able to roll between side surfaces of a corresponding one of raceway grooves of an outer ring and a torque transmitting surface of a corresponding one of the intermediate members. Then, raceway recesses are formed on the side surfaces of each raceway groove so as to extend in a direction of a rotation axis of the outer ring. The shaft-like rolling elements are fitted in the corresponding raceway recesses and are able to roll along bottom surfaces of the respective raceway recesses. Thus, the retainers are arranged outside the raceway recesses.Type: GrantFiled: December 16, 2009Date of Patent: April 24, 2012Assignee: JTEKT CorporationInventors: Koichiro Mizuno, Yoshinari Sakai, Tatsuya Yoshi
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Patent number: 8164284Abstract: In an electric power steering system, an ECU 11 that controls the operation of the system includes three independent microcomputers 18u, 18v, 18w that perform phase current feedback control with respect to the corresponding phases, so that sinusoidal current is applied to each phase of the motor 12 as a non-connected motor. Also, each of the microcomputers 18u, 18v, 18w monitors a deviation of an actual current value from a phase current command value, with respect to each of two phases other than the corresponding phase, and determines that an abnormality occurs in the phase in question when the deviation exceeds a predetermined threshold value. When two of the microcomputers 18u, 18v, 18w determine that the abnormality occurs in the remaining one phase, the ECU 11 confirms the determination that the phase in question is in an abnormal condition.Type: GrantFiled: July 9, 2010Date of Patent: April 24, 2012Assignee: JTEKT CorporationInventor: Noritake Ura
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Patent number: 8162545Abstract: A hub unit is equipped with an inner member having an inner ring raceway formed on its outer peripheral face, an outer member having an outer ring raceway formed on its inner peripheral face, and a plurality of rolling elements provided between the inner ring raceway and the outer ring raceway. At least one of the inner ring raceway and the outer ring raceway has a rolling contact zone on which an induction-hardened layer is formed. The hardened layer has a depth of about 1.5 to 1.9 mm at a distance of 1 mm inward from each end of the hardened layer.Type: GrantFiled: January 29, 2009Date of Patent: April 24, 2012Assignee: JTEKT CorporationInventor: Masao Takimoto
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Publication number: 20120094074Abstract: The present invention provides a DLC film that has good adhesiveness even in a low-temperature environment, and a DLC film-forming method capable of forming this DLC film. The present invention also provides a DLC film that has excellent initial compatibility, and a DLC film-forming method capable of forming this DLC film. In the present invention, a first opposing surface (31) that faces an inner clutch plate, of a substrate (30) of an outer clutch plate (15) is covered by a DLC film (26). Also, a treatment layer (33) is formed on a surface layer portion of the substrate (30). The treatment layer (33) is formed by applying direct-current pulse voltage to the substrate (30), and generating plasma in an atmosphere that contains argon gas and hydrogen gas.Type: ApplicationFiled: June 9, 2010Publication date: April 19, 2012Applicant: JTEKT CorporationInventors: Masahiro Suzuki, Toshiyuki Saito, Kazuyoshi Yamakawa
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Publication number: 20120095648Abstract: A motor vehicle steering system includes a knob that is for rotating a wheel of a steering member, has a knob center, and is supported rotatably around the knob center by the wheel. A control unit sets a predetermined period after detection of gripping on the knob by a grip detection device as a transfer period for transfer from reaction force application only by a wheel reaction force actuator to reaction force application only by a knob reaction force actuator. In the transfer period, the knob reaction force is increased with time and the wheel reaction force is reduced with time.Type: ApplicationFiled: October 11, 2011Publication date: April 19, 2012Applicant: JTEKT CORPORATIONInventor: Ryouhei HAYAMA
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Publication number: 20120094796Abstract: A resin pulley includes an outer cylindrical portion including an outer circumferential surface on which a belt is to be wound, an inner cylindrical portion, and a plurality of ribs connecting an inner circumferential surface of the outer cylindrical portion and an outer circumferential surface of the inner cylindrical portion, which are formed of a resin material. The ribs are provided so as to be inclined towards a circumferential direction relative to a radial imaginary line as viewed in an axial direction. Radially outer end portions of the ribs are formed such that inclination angles of the respective radially outer end portions relative to the radial imaginary line increase as the ribs extend radially outward, and radially inner end portions of the ribs are formed such that inclination angles of the respective radially inner end portions relative to the radial imaginary line increase as the ribs extend radially inward.Type: ApplicationFiled: December 23, 2011Publication date: April 19, 2012Applicant: JTEKT CorporationInventors: Kazuki HAMADA, Hiroshi Ueno, Kunio Yanai, Masanori Shinohara, Tomoki Uno
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Publication number: 20120090913Abstract: A controller applies slight rotational torque to a drive gear of a reduction mechanism also in a predetermined range in which a motor does not produce any steering operation assist force. That is, the motor is caused to produce slight rotational torque not enough to drive a driven gear, and the rotational torque direction is reversed under a given condition. Accordingly, a backlash between the drive gear and the driven gear is eliminated.Type: ApplicationFiled: June 21, 2010Publication date: April 19, 2012Applicant: JTEKT CORPORATIONInventors: Shinsuke Terada, Hideki Higashira, Yasuyuki Yoshii, Naoki Maeda, Shirou Nakano
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Publication number: 20120090290Abstract: A method of manufacturing a power transmission chain pin, which connects links arranged in a chain width direction of a power transmission chain, includes a rough sectional shape formation step of drawing a wire rod so that a section thereof is formed in a substantially oval shape and a rough end portion shape formation step of cutting a continuous bar-like member which has been subjected to the drawing work into a predetermined length so that an end surface thereof has a predetermined angle with respect to an axial direction. A final sectional shape and a final end portion shape of the power transmission chain pin are formed by a cold forging work to the bar-like member cut into the predetermined length, which is a final shape formation step.Type: ApplicationFiled: December 23, 2011Publication date: April 19, 2012Applicant: JTEKT CorporationInventor: Yoshihisa Miura
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Patent number: 8160777Abstract: When an electrification failure occurs in any of the phase of a motor, a control device of an electric power steering device executes current control for generating, in each of two electrification phases other than a phase with the electrification failure, a phase current that changes in the form of a secant curve or a cosecant curve based on an asymptotic line, which is a predetermined rotational angle corresponding to the phase with the electrification failure, to thereby continuously output a motor control signal. The control device of the electric power steering device executes current restriction for restricting the phase current within a predetermined range. The control device of the electric power steering device further executes control for accelerating rotation of the motor during two phase drive, in order to prevent the occurrence of a stuck steering wheel during low-speed steering, which is caused as a result of the execution of the current restriction.Type: GrantFiled: November 19, 2008Date of Patent: April 17, 2012Assignee: JTEKT CorporationInventor: Terutaka Tamaizumi
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Patent number: 8159166Abstract: A motor drive circuit includes a transistor that is connected in parallel to a first voltage divider resistance that forms a voltage divider circuit between the source and the gate of a second interrupting MOSFET. If a reverse connection of the battery occurs, a compensation drive circuit turns on the transistor using an output from the battery so that the source and the gate of the second interrupting MOSFET are short-circuited. Thus, formation of a closed circuit that includes the battery and the inverter circuit is prevented. As a result, it is possible to prevent both terminals of the battery from being short-circuited.Type: GrantFiled: October 29, 2009Date of Patent: April 17, 2012Assignee: JTEKT CorporationInventor: Susumu Koike
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Patent number: 8157271Abstract: A floating chuck mechanism provided at a workhead that is arranged at a processing apparatus for sandwiching a cylindrical-shaped workpiece by means of two center members along a rotational axis, the floating chuck mechanism causing the workpiece to rotate about the rotational axis and correcting an eccentricity between the rotational axis and a center of an outer diameter of the workpiece, includes a chuck body portion including plurality of clamp jaws for holding the workpiece from the outer peripheral side thereof, and a chuck base portion fixed to the workhead so as to rotate therewith, the chuck base portion including a fixed portion fixed to the workhead and a slide portion slidable along a slide surface perpendicular to the rotational axis. The chuck body portion is fixed to the slide portion and sliding along the slide surface so as to correct the eccentricity.Type: GrantFiled: February 13, 2008Date of Patent: April 17, 2012Assignee: JTEKT CorporationInventors: Hisataka Sato, Naomasa Mukaide, Masayuki Takeshima, Takashi Matsui
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Patent number: 8157659Abstract: A telescopic shaft (5) has an inner shaft (12) and a tubular outer shaft (13) that are fitted to each other so as to be relatively movable in an axial direction (X1) and to be able to transmit torque between each other. A row of a plurality of rolling bodies (14) is interposed between corresponding axial grooves (15, 16) of the inner shaft (12) and the outer shaft (13). A retaining member (17) moving together with the rolling bodies (14) while retaining the rolling bodies (14) has a facing portion (33) facing an end surface (121) of the inner shaft (12). As the telescopic shaft (5) telescopes in and out, the facing portion (33) comes into contact with the end surface (121) of the inner shaft (12), and this limits the movement of the rolling bodies (14) in the axial direction (X1).Type: GrantFiled: September 25, 2006Date of Patent: April 17, 2012Assignees: JTEKT Corporation, Koyo Machine Industries Co., Ltd.Inventors: Satoshi Kakutani, Hiroyuki Muraosa
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Publication number: 20120087612Abstract: According to the invention, a cage has a ring portion, and a plurality of column portions that protrude from the ring portion, are arranged in the circumference direction, and form pockets that house balls serving as rolling elements. Each column portion has a column portion radially inward section that forms a bearing-radial-direction inward side portion of the column portion, and a column portion radially outward section that is connected to the column portion radially inward section at its radially outer end position, so as to protrude on both sides in the circumferential direction from the column portion radially inward section. An inner surface of each pocket is formed in a spherical shape that lies astride the column portion radially inward section and the column portion radially outward section.Type: ApplicationFiled: June 21, 2010Publication date: April 12, 2012Applicant: JTEKT CORPORATIONInventors: Masaki Maeda, Tsuyoshi Okumura, Hiroshi Yano
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Publication number: 20120088701Abstract: A DLC-coated member (100) has a base (200), an intermediate layer (300) that covers the surface of the base (200), and a DLC film (400) that covers the surface of the intermediate layer (300). The intermediate layer (300) has a five-layer structure, constituted of a first intermediate layer (301), a second intermediate layer (302), a third intermediate layer (303), a fourth intermediate layer (304), and a fifth intermediate layer (305). The five layers (301 to 305) are made of DLC to which Si has been added. Among the layers (301 to 305), the Si concentration in the first intermediate layer (301) is the highest, and that in the fifth intermediate layer (305) is the second highest. The Si concentrations in the second intermediate layer (302), third intermediate layer (303), and fourth intermediate layer (304) are lower than those in the first intermediate layer (301) and fifth intermediate layer (305).Type: ApplicationFiled: October 6, 2011Publication date: April 12, 2012Applicant: JTEKT CORPORATIONInventors: Masahiro SUZUKI, Toshiyuki SAITO, Kazuyoshi YAMAKAWA
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Publication number: 20120088623Abstract: A planetary gear mechanism of the invention includes a housing, an input shaft that has an eccentric portion whose center lies on an eccentric axis that is displaced from an axis of input and output shafts, and is supported by the housing to be rotatable about the axis of the input and output shafts relative to the housing, an oscillating face plate that eccentrically oscillates via the eccentric portion, such that its rotation relative to the housing is restricted, and an output shaft to which an internally toothed gear that internally contacts and meshes with an externally toothed gear formed on the oscillating face plate is mounted, and which is rotatable about the axis of the input and output shafts relative to the housing. As the input shaft rotates, a circumferential position at which the externally toothed gear and the internally toothed gear mesh with each other changes, and rotation of the input shaft is delivered at a reduced speed to the output shaft.Type: ApplicationFiled: June 9, 2010Publication date: April 12, 2012Applicant: JTEKT CorporationInventors: Kouji Nagumo, Hiromichi Ota, Tomohiro Honda, Yoshiharu Suzuki, Yoshinobu Katoh