Patents Assigned to JTEKT
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Patent number: 8408353Abstract: Disclosed is a vehicle steering apparatus (1; 301) equipped with a control device (12; 322) which controls the actuation of an electric motor (18; 317). First and second housings (23, 24 325, 312), which are in contact with each other, partition off an accommodation chamber (100; 324) which contains the control device (12; 322). The first housing (23; 325) is at least one part of the motor housing (25; 323). The first housing (23; 325) includes a first interior wall surface (101; 401) which partially partitions the accommodation chamber (100; 324). The second housing (24; 312) includes a second interior wall surface (102; 402) which partially partitions the accommodation chamber (100; 324). The first and the second interior wall surfaces (101, 102; 401, 402) are opposite each other with respect to the axial direction (X1) of a rotatable shaft (37; 352) of an electric motor (18; 317).Type: GrantFiled: February 9, 2009Date of Patent: April 2, 2013Assignee: JTEKT CorporationInventors: Shigeki Nagase, Ken Matsubara, Minoru Sentoku, Kunihiro Oka, Motoo Nakai, Kouya Yoshida, Nobuhiro Uchida, Naotake Kanda
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Patent number: 8408967Abstract: It is an object of the present invention to provide a machine tool with a rest apparatus having high supporting stiffness of a workpiece by the rest apparatus and having flexibility to machine a plurality of kinds of the workpieces selectively and to provide a machining method of the machine tool with the rest apparatus. The machine tool with the rest apparatus comprising a base 10, a spindle head 20 mounted on the base 10 to hold rotatably one end of a workpiece W, a tail stock 30 mounted on the base 10 to be faced to the spindle head 20 and to hold rotatably the other end of the workpiece W, first rest apparatus 52 mounted between the spindle head 20 and the tail stock 30 and fixed to the base 10 un-movably to support the workpiece W, and second rest apparatus 53 mounted between the spindle head 20 and the tail stock 30 and movably mounted on the base 10 to support said workpiece W.Type: GrantFiled: September 11, 2009Date of Patent: April 2, 2013Assignee: JTEKT CorporationInventors: Masahiro Ido, Yoshihiro Somyo
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Patent number: 8410734Abstract: In a motor control device, a control calculation unit obtains a phase voltage instruction value. A current detecting unit detects an electric current which flows into the brushless motor. A rotational position detecting unit detects the rotational position of a rotor in the brushless motor. A correction unit corrects the phase voltage instruction value based on the detection results of the current detecting unit and the rotational position detecting unit so that a dependency of a ratio on an electric angle shown by a secondary harmonic component of the ratio concerning the electric angle of the brushless motor. The ratio is a ratio of a q-axis or d-axis component of the electric current, which flows into the brushless motor, to a q-axis or d-axis instruction value. A driving unit drives the brushless motor based on the phase voltage instruction value after the correction by the correction unit.Type: GrantFiled: January 16, 2009Date of Patent: April 2, 2013Assignee: Jtekt CorporationInventors: Takeshi Ueda, Nobuhiro Uchida, Kouya Yoshida
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Patent number: 8409019Abstract: A propeller shaft includes a first shaft having a yoke at one end, a second shaft slidably connected to the other end of the first shaft, and a surface treated member which is arranged at a connecting portion, at which the first shaft and the second shaft are connected to each other, and to which surface treatment for improving slidability of the second shaft with respect to the first shaft is applied. The surface treated member is formed by a substrate which is separate from the first shaft and the second shaft and to which the surface treatment has been applied. The surface treated member is arranged at the connecting portion, at which the first shaft and the second shaft are connected to each other, after the surface treatment is applied.Type: GrantFiled: December 3, 2010Date of Patent: April 2, 2013Assignee: JTEKT CorporationInventors: Tomoki Ogawa, Satoshi Araki, Yukinobu Nishiyama, Yoshinori Satou, Kazunori Aoki
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Patent number: 8408243Abstract: A valve device includes: a valve member that controls flow of a fluid, and a body that has a valve insertion hole in which the valve member is inserted, and whose inner surface is cylindrically formed, and into which the fluid flows, and a lead-in passage that has an opening in the inner surface of the valve insertion hole, and that causes the fluid to flow into the valve insertion hole. A line representing the direction of extension of the lead-in passage is tilted from a line normal to the inner surface of the valve insertion hole at a position of the opening of the lead-in passage, in a view in the axis direction of the valve insertion hole.Type: GrantFiled: June 17, 2009Date of Patent: April 2, 2013Assignee: JTEKT CorporationInventors: Hiroaki Suzuki, Takuya Suzuki, Munetoshi Kuroyanagi, Toshihiko Shima
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Patent number: 8412429Abstract: A vehicle 1 has a torque coupling 8, which is located in a driving power transmission system for transmitting the torque of an engine 2 to front and rear wheels 13f, 13r. The torque coupling 8 changes the torque distribution by adjusting the frictional engaging force of an electromagnetic clutch 16. The vehicle 1 also has a 4WD ECU 21 (CPU), which controls the operation of the torque coupling 8 based on the driving state. The 4WD ECU 21 (CPU) estimates a transfer case oil temperature Tptu. When the transfer case oil temperature Tptu is higher than or equal to a first predetermined transfer case oil temperature KTptu1, the 4WD ECU 21 executes overheat prevention control.Type: GrantFiled: October 22, 2009Date of Patent: April 2, 2013Assignee: JTEKT CorporationInventors: Masaki Mita, Ryohei Shigeta, Tomoaki Kato
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Publication number: 20130074576Abstract: A road friction coefficient estimating unit calculates a tire sideslip angle and a cornering force, and estimates a road friction coefficient on the basis of the ratio of the calculated cornering force to the calculated tire sideslip angle. A vehicle travels on multiple road surfaces that differ in road friction coefficient, and tire sideslip angles and cornering forces on the road surfaces are detected in advance. The road friction coefficient estimating unit stores, in a memory, a correlation among the detected tire sideslip angles, the detected cornering forces, and the road friction coefficients in the form of numerical values or a mathematical expression, and estimates a road friction coefficient using the correlation stored in the memory.Type: ApplicationFiled: September 19, 2012Publication date: March 28, 2013Applicant: JTEKT CORPORATIONInventor: JTEKT CORPORATION
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Publication number: 20130079992Abstract: While drive control of an electric motor is being executed in a normal mode, when a duration of a state where a vehicle speed is lower than or equal to a threshold, a steering angular velocity is lower than or equal to a threshold and a motor current is smaller than or equal to a threshold is longer than or equal to a first predetermined time defined by a threshold, a control mode is changed to a power-saving mode. Thus, a target rotation speed of the electric motor is changed from a first target rotation speed to a second target rotation speed.Type: ApplicationFiled: September 19, 2012Publication date: March 28, 2013Applicant: JTEKT CORPORATIONInventor: JTEKT CORPORATION
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Publication number: 20130075219Abstract: An electromagnetic clutch includes: a first cam member having a first cam surface; a second cam member having a second cam surface facing the first cam surface; a coned disc spring that urges the second cam member such that the first and second cam surfaces are separated from each other; a clutch plate that contacts the second cam member due to urging force of the urging member, and generates friction force between the clutch plate and the second cam member; and an electromagnetic coil that generates magnetic force with which the second cam member is separated from the clutch plate against the urging force of the urging member. The first cam surface and the second cam surface generate thrust force by which the second cam member is pushed against the friction member, through relative rotation between the first cam member and the second cam member due to the friction force.Type: ApplicationFiled: September 12, 2012Publication date: March 28, 2013Applicant: JTEKT CORPORATIONInventors: Minoru ONITAKE, Hiroshi Takuno, Kazuya Ando, Kenji Korenaga
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Publication number: 20130076283Abstract: A motor control unit controls a motor including a rotor and a stator facing the rotor. A current drive unit drives the motor at an axis current value of a rotating coordinate system that rotates in accordance with a control angle that is a rotational angle used in a control. An addition angle calculation unit calculates an addition angle to be added to the control angle. A control angle calculation unit obtains, at every predetermined calculation cycle, a present value of the control angle by adding the addition angle that is calculated by the addition angle calculation unit to an immediately preceding value of the control angle. A torque detection unit detects a torque that is other than a motor torque and that is applied to a drive target driven by the motor. A command torque setting unit sets a command torque to be applied to the drive target.Type: ApplicationFiled: November 26, 2012Publication date: March 28, 2013Applicant: JTEKT CORPORATIONInventor: JTEKT CORPORATION
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Publication number: 20130079183Abstract: A power transmission chain includes a plurality of links respectively having front and rear insertion parts into which pins are inserted, a plurality of first pins and a plurality of second pins which are arranged in front and back for connecting the links A plurality of the links includes two types of the links having different pitch lengths, wherein provided that a radius of a pulley shaft is RA, a radius of curvature of a face of the link having a shorter pitch length at an inner diameter side of the chain is RS, and a radius of curvature of a face of the link having a longer pitch length at an inner diameter side of the chain is RL, relation is set to be RA?RS?1.5 RA, and RS<RL.Type: ApplicationFiled: November 20, 2012Publication date: March 28, 2013Applicant: JTEKT CorporationInventor: JTEKT Corporation
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Publication number: 20130079993Abstract: A vehicle steering system includes: an electric motor that applies a torque to a steering shaft with the use of field units that differ in number of turns; and a control unit that controls the torque of the electric motor on the basis of a steering torque that is a torque input to the steering shaft in response to an operation of a steering wheel. The control unit controls at least one of motor currents that are supplied to the field units of the electric motor.Type: ApplicationFiled: September 19, 2012Publication date: March 28, 2013Applicant: JTEKT CORPORATIONInventor: JTEKT Corporation
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Patent number: 8403566Abstract: A rolling bearing includes rolling elements, an inner ring which includes a raceway surface on which the rolling elements roll on an outer circumference thereof, and an outer ring which includes a raceway surface on which the rolling elements roll and which receives a radial load and a load directed to one side of an axial direction from the rolling elements on an inner circumference thereof. A closure member for closing an inner circumferential side opening of the outer ring is formed integrally at an end portion of the outer ring which lies on the one side of the axial direction or the outer ring is fitted in a cylindrical portion of the closure member.Type: GrantFiled: November 12, 2007Date of Patent: March 26, 2013Assignee: JTEKT CorporationInventors: Kanichi Koda, Tadashi Fukao
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Patent number: 8403110Abstract: By incorporating a pump for sucking and discharging lubricating oil in a tank for storing the lubricating oil on an outside of a rolling bearing, for example, on a spacer for an outer ring in a housing for accommodating the rolling bearing and a nozzle in which an lubricating oil outlet communicating with a discharging port of the pump to supply the lubricating oil discharged from the pump to the rolling bearing is opened in an annular-shaped space between a fixed ring and a rolling ring in the rolling bearing, a cost is reduced by using a general-purpose rolling bearing, and at the same time, external devices and pipes for a lubrication are not required wholly or partially and problems of a noise made by compressed air are eliminated.Type: GrantFiled: October 28, 2005Date of Patent: March 26, 2013Assignee: Jtekt CorporationInventors: Kazuya Suzuki, Kiyoshi Tanimoto, Hiroshi Ueno, Shinji Fukuda
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Patent number: 8403646Abstract: An oil pump system for a vehicle includes: a vane pump having a plurality of vanes which respectively project retractably from a plurality of vane accommodating grooves provided in a rotor so as to be brought into sliding contact with a cam surface, the vane pump being adapted to supply a hydraulic fluid to an automatic transmission; an electric power-driven oil pump for assisting the hydraulic pressure of the hydraulic fluid during an idling stop of the automobile; and an ECU for controlling its operation. During an idling stop, the hydraulic fluid is fed to the automatic transmission by the operation of the electric power-driven oil pump to assist the hydraulic pressure, while the hydraulic fluid is fed with pressure also to the vane accommodating grooves to press the vanes against the cam surface.Type: GrantFiled: May 16, 2008Date of Patent: March 26, 2013Assignee: JTEKT CorporationInventor: Koudi Yoshinami
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Publication number: 20130073147Abstract: A vehicle steering system includes a steering angle detecting unit; a reaction force actuator; and a reaction force actuator control unit. The reaction force actuator control unit determines whether the steering angle detected by the steering angle detecting unit is within a first steering angle range where the steering angle is smaller than or equal to a first change angle or a second steering angle range where the steering angle is larger than the first change angle, and controls the reaction force actuator such that the steering reaction force is increased to a maximum value with an increase in the steering angle when the steering angle is within the first steering angle range and the steering reaction force is monotonically decreased from the maximum value with an increase in the steering angle when the steering angle is within the second steering angle range.Type: ApplicationFiled: September 7, 2012Publication date: March 21, 2013Applicant: JTEKT CORPORATIONInventor: Takashi TASHIRO
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Publication number: 20130069635Abstract: A motor rotation angle sensor includes a plurality of Hall elements and a plurality of switches, each a which is able to interrupt supply of power for operating a corresponding one of these Hall elements.Type: ApplicationFiled: September 7, 2012Publication date: March 21, 2013Applicant: JTEKT CORPORATIONInventor: Hiroshi KITAMOTO
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Publication number: 20130071267Abstract: A pump housing of a gear pump and a stator of an electric motor are fastened to each other with bolts via a front insulator. Dowel pins are inserted in respective through-holes that are formed in the front insulator at equal intervals in a circumferential direction so as to be located next to insertion holes for the bolts. Respective end portions of each dowel pin are in contact with a bottom face of the pump housing and a pump-side surface of the stator core, and the pump housing and the front insulator are fixed to each other such that a slight gap is formed between the pump housing and the front insulator.Type: ApplicationFiled: September 7, 2012Publication date: March 21, 2013Applicant: JTEKT CORPORATIONInventor: Junichi MIYAKI
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Patent number: 8401738Abstract: An ECU of an electric power steering system includes a driving circuit configured as an H bridge circuit; a microcomputer that controls the driving circuit; a capacitor for stabilizing electric power that is supplied to the driving circuit; and a resistor that is interposed in a second power supply path that bypasses a first power supply path in which the relay contact is interposed. The microcomputer causes a relay circuit to be activated after the capacitor is charged via the resistor (second power supply path). The microcomputer determines whether a stuck-open fault has occurred on the basis of a voltage difference between terminals of the relay contact at the time when both FETs that are connected in series and that constitute the driving circuit are turned on to cause the discharge of the capacitor after the relay circuit is activated.Type: GrantFiled: September 20, 2010Date of Patent: March 19, 2013Assignee: Jtekt CorporationInventor: Tomoya Nakai
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Patent number: 8397859Abstract: In an electric power steering system, multiple cutouts (45) are formed in a flange portion (36) formed on an axial end portion (23a) of a ball screw nut (23) of a ball screw device that drives a rack shaft. In addition, a motor shaft (6) has a thin-plate portion (44) that extends on the radially outer side of the ball screw nut (23). When the thin-plate portion (44) that extends from the motor shaft (6) is swaged into the cutouts (45) that serve as engagement recesses that have side walls in the circumferential direction, the rotation of the ball screw nut (23) relative to the motor shaft (6) is restricted.Type: GrantFiled: August 23, 2010Date of Patent: March 19, 2013Assignee: JTEKT CorporationInventors: Toshihiro Asakura, Takashi Hara, Masayoshi Asakura
