Patents Assigned to JTEKT
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Publication number: 20210214003Abstract: A steering system includes a rotary shaft to which an operation member is coupled; a first actuator; a second actuator; a control unit; and a moving unit configured to move the operation member between a normal position and a storage area. The control unit is configured to switch between a manual drive mode and an autonomous drive mode. The control unit is configured to, when moving the operation member from the storage area to the normal position, start synchronous control when the operation member satisfies a predetermined condition before the operation member reaches the normal position, the synchronous control being control in which the control unit controls the first actuator to change a rotation angle of the rotary shaft to an angle corresponding to a steered angle of steered wheels driven by the second actuator.Type: ApplicationFiled: January 11, 2021Publication date: July 15, 2021Applicant: JTEKT CORPORATIONInventors: Takeshi WATANABE, Yasuyuki NOZAWA
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Publication number: 20210213565Abstract: An additive manufacturing device includes: an inner light beam radiation device of radiating an inner light beam; an outer light beam radiation device of radiating an outer light beam; and a control device. when a molten pool is irradiated with the outer light beam, the control device controls a power density of the outer light beam representing an output per unit area such that a cooling rate of the molten pool representing a temperature drop per unit time is 540° C./s or less at a freezing point of a carbide binder included in the molten pool, the molten pool being formed by irradiating a material including a hard material and a carbide binder with the inner light beam to melt the material. According to the present disclosure, the additive manufacturing device can prevent cracking and additively manufacture a high-quality shaped object with a simple configuration.Type: ApplicationFiled: December 30, 2020Publication date: July 15, 2021Applicant: JTEKT CORPORATIONInventors: Makoto TANO, Takaya NAGAHAMA, Koichi SHIIBA, Takashi MIZOGUCHI, Kohei KATO, Sho HASEGAWA
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Patent number: 11059514Abstract: An input torque fundamental component computation circuit includes: a torque command value computation circuit that computes a torque command value corresponding to a target value for steering torque that is to be input by a driver for drive torque obtained by adding the steering torque to an input torque fundamental component; and a torque F/B control circuit that computes the input torque fundamental component through execution of torque feedback control for causing the steering torque to follow the torque command value. A target steering angle computation circuit computes a target steering angle on the basis of the input torque fundamental component. A steering-side control circuit computes target reaction force torque on the basis of execution of angle feedback control for causing a steering angle to follow a target steering angle. The torque command value computation circuit computes the torque command value in consideration of the grip state amount.Type: GrantFiled: May 28, 2019Date of Patent: July 13, 2021Assignee: JTEKT CORPORATIONInventor: Takashi Kodera
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Patent number: 11060594Abstract: A driving force distribution apparatus includes an orthogonal gear pair constituted by a pinion gear shaft and a ring gear member, a casing that houses the orthogonal gear pair, an intermediate rotational member coaxially rotatable relative to the ring gear member, a clutch member configured to couple the ring gear member and the intermediate rotational member to each other, and first and second driving force adjustment mechanisms configured to adjust a driving force to be transmitted from the intermediate rotational member to first and second output rotational members. The ring gear member has a ring gear portion and a tubular portion. At two positions between which the ring gear portion is interposed in an axial direction, the tubular portion) is rotatably supported by a pair of bearings.Type: GrantFiled: January 30, 2018Date of Patent: July 13, 2021Assignee: JTEKT CORPORATIONInventor: Noriyuki Fujii
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Patent number: 11060931Abstract: A sensor device that can reduce an assembly error of a magnetic sensor with respect to holders is provided. Magnetic sensors are disposed between first magnetism collection portions and second magnetism collection portions with a first holder and a second holder assembled to each other. A circuit board recessed portion of the second holder is provided with positioning protrusions that extend toward the first holder. A circuit board, on which the magnetic sensors are mounted, is provided with through holes. The magnetic sensors are integrally assembled to the second holder in advance with the positioning protrusions inserted through the through holes.Type: GrantFiled: July 22, 2019Date of Patent: July 13, 2021Assignee: JTEKT CORPORATIONInventor: Yuichi Toyama
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Patent number: 11059115Abstract: A gear machining apparatus creates a gear on a workpiece W by moving a gear cutting tool relatively with respect to the workpiece along the direction of the rotation axis of the workpiece W while synchronously rotating the gear cutting tool and the workpiece. One of a workpiece rotation speed controlling portion and a tool rotation speed controlling portion varies the rotation speed of one of the workpiece and the gear cutting tool and the other one of the workpiece rotation speed controlling portion and the tool rotation speed controlling portion synchronizes the rotation speed of the other one of the workpiece and the gear cutting tool with one of the rotation speed of the workpiece and the gear cutting tool.Type: GrantFiled: October 11, 2017Date of Patent: July 13, 2021Assignee: JTEKT CORPORATIONInventors: Daichi Kanda, Takaaki Hashimoto, Yuji Sasaki, Yoshihiko Yamada, Hisashi Otani, Yoshitaro Ohsaki
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Patent number: 11059516Abstract: Provided is a steering control apparatus capable of performing adjustment so as to suppress deterioration in a steering feel that is caused by a twist of a torsion bar. A torsional stiffness control circuit includes a torsion angle calculation circuit, a gain calculation circuit, multiplication circuits, and an addition circuit. The torsion angle calculation circuit calculates a torsion angle based on a steering torque. The gain calculation circuit calculates a gain having a positive or negative value based on a value obtained by multiplying the steering torque and a steering speed together by the multiplication circuit. The multiplication circuit calculates a compensation amount by multiplying the torsion angle and the gain together. The addition circuit calculates a target pinion angle having a compensated phase by adding the compensation amount to a target steering angle.Type: GrantFiled: January 18, 2019Date of Patent: July 13, 2021Assignee: JTEKT CORPORATIONInventor: Takashi Kodera
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Publication number: 20210206373Abstract: A vehicle control device mounted on a four-wheel drive vehicle including a driving force transmission system includes an electronic control unit. The electronic control unit calculates a command torque based on vehicle information. The electronic control unit estimates a temperature of a heat generating location in the driving force transmission system based on the command torque. The electronic control unit estimates the temperature of the heat generating location based on an estimated value of a driving force input to an input rotating member, when it is not possible for the driving force corresponding to the command torque to be transmitted to auxiliary drive wheels due to a magnitude of the driving force generated by a drive source or occurrence of a wheel slip.Type: ApplicationFiled: December 28, 2020Publication date: July 8, 2021Applicant: JTEKT CORPORATIONInventors: Kaoru SOBUE, Go NAGAYAMA
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Patent number: 11054485Abstract: A power supply monitoring apparatus includes dual supply path controllers. The controllers continuously test the power supply and the supply paths by alternating power states and monitoring the response from the supply path. If an interruption in normal operation is sensed in one supply path, information regarding the abnormality can be sent to the other controller, thereby allowing for continued operation and monitoring despite the failure of a supply path.Type: GrantFiled: July 29, 2019Date of Patent: July 6, 2021Assignee: JTEKT CorporationInventor: Takanori Ito
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Publication number: 20210197889Abstract: A steering control device includes an electronic control unit that stores an end position corresponding angle. The electronic control unit is configured to execute end strike relaxation control, to execute partial release control in a case where turning of a vehicle is attempted during execution of the end strike relaxation control, to make a non-following determination and acquire a release-time restriction position determination angle that corresponds to the absolute steering angle detected at a time when the electronic control unit determines that the movement of the steered shaft is restricted, and to permit update of the end position corresponding angle based on the release-time restriction position determination angle, and update the end position corresponding angle in a case where the update of the end position corresponding angle is permitted.Type: ApplicationFiled: December 21, 2020Publication date: July 1, 2021Applicant: JTEKT CORPORATIONInventors: Takafumi YAMAGUCHI, Takahiro TOKO, Nobuaki KATAOKA, Yukinobu EZAKI
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Publication number: 20210199157Abstract: A bearing support structure wherein a shaft member that rotates about a central axis is rotatably supported by a rolling bearing split into two portions in a peripheral direction, wherein the shaft member has a fitting portion into which the rolling bearing is externally fitted, the fitting portion has a non-round shape in a direction orthogonal to the central axis, and the rolling bearing includes an inner ring that is split into two portions in a peripheral direction and is externally fitted to the fitting portion and has an inner raceway surface on an outer periphery, an outer ring that is split into two portions in a peripheral direction and is fixed radially outward of the inner ring, and that has an outer raceway surface coaxial with the inner raceway surface on an inner periphery, and a plurality of rolling elements rotatably disposed between the inner and outer raceway surfaces.Type: ApplicationFiled: January 25, 2019Publication date: July 1, 2021Applicant: JTEKT CORPORATIONInventor: Kensuke KIMURA
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Publication number: 20210197885Abstract: A steering device includes: a rack shaft; a rack housing; a pinion shaft that meshes with the rack shaft; a speed reducer having a worm wheel that is coupled to the pinion shaft and a worm shaft that meshes with the worm wheel; a speed reducer housing; a motor that drives the worm shaft; a plate-shaped cover that seals an opening of the speed reducer housing; and a breather valve that is mounted on the cover in a state of penetrating through the cover. An inner surface of the cover that faces the worm wheel has an entry restricting part that restricts entry of a lubricant into the breather valve.Type: ApplicationFiled: December 22, 2020Publication date: July 1, 2021Applicant: JTEKT CORPORATIONInventor: Akifumi AMANO
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Patent number: 11050325Abstract: Provided is a motor apparatus in which an increase in its size in a radial direction of a rotation shaft of a motor can be suppressed while securing redundancy of control of driving of the motor. A motor apparatus includes a motor having a rotation shaft, a first control circuit board where a first power circuit and a first control circuit are mounted, and a second control circuit board where a second power circuit and a second control circuit are mounted. The control circuit boards are arranged with an overlapping portion when viewed along an axial direction on an extension line of an axis of the rotation shaft. The overlapping portion intersects the extension line of the rotation shaft of the motor.Type: GrantFiled: November 2, 2018Date of Patent: June 29, 2021Assignee: JTEKT CORPORATIONInventor: Yuto Sato
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Patent number: 11046358Abstract: An estimated axial force computation circuit of a control device has an axial force computation circuit that computes an axial force that acts on a steered shaft on the basis of a current value of a steering motor. The estimated axial force computation circuit has a friction compensation circuit, an efficiency compensation circuit, and a gradient compensation circuit as static characteristic computation circuits that compensate for an effect of the static characteristics of a steering mechanism on the axial force computed. The estimated axial force computation circuit has a filter as a dynamic characteristic computation circuit that compensates for an effect of the dynamic characteristics of the steering mechanism. The filter removes, from the axial force, an effect of the viscosity and the inertia of the steering motor. The axial force after compensation is used to control a reaction force motor.Type: GrantFiled: May 10, 2018Date of Patent: June 29, 2021Assignee: JTEKT CORPORATIONInventors: Takashi Kodera, Masayuki Kita
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Patent number: 11046352Abstract: A steering column includes: a cylindrical member that holds a steering shaft in such a manner as to allow extension and contraction of the steering shaft; a holding member that holds the cylindrical member; a fixture member that is fixed to a vehicle body; a coupling member that couples the fixture member and the holding member; and an energy absorbing member that is partially fixed to the holding member. The coupling member uncouples the fixture member and the holding member when the holding member moves forward for a specified distance in an axial direction. The fixture member has an engaging section arranged at a position where the engaging section is engaged with an engaged section of the energy absorbing member when the holding member moves forward for the specified distance or longer in the axial direction.Type: GrantFiled: May 17, 2019Date of Patent: June 29, 2021Assignees: JTEKT CORPORATION, FUJI KIKO CO., LTD.Inventors: Hidekazu Miyai, Osamu Fujimura, Yota Uesaka, Yasuhiro Tanioka, Akio Osuka, Takuya Suzuki
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Patent number: 11049634Abstract: An electromagnetic actuator includes an electromagnetic coil, a yoke serving as a magnetic path of a magnetic flux of the electromagnetic coil, an armature configured to move in an axial direction while being attracted by the yoke by energization of the electromagnetic coil, and a housing that houses the armature. The armature and the housing are coupled to each other by an engagement structure in which protrusions provided on one of the members engage with engagement grooves formed in the other one of the members. At least a part of the engagement groove is inclined with respect to the axial direction. When the armature moves while being attracted by the yoke, the protrusions of the armature slide along the engagement grooves of the housing, and the armature turns relative to the housing along the inclination of the engagement grooves.Type: GrantFiled: November 13, 2018Date of Patent: June 29, 2021Assignee: JTEKT CORPORATIONInventors: Yuji Tsuzuki, Hiroshi Takuno
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Patent number: 11047459Abstract: A ball screw device includes a screw shaft; a nut having a second helical groove; and a plurality of balls. When the screw shaft is rotated about an axis of the screw shaft while being subjected to the external force, the balls are displaced from positions under no load condition toward one side in an axial direction. A second helical groove of the nut includes a stopping member configured to prevent the balls from falling off from the second helical groove. A plurality of coil springs are arranged in series along the second helical groove. An angle in a circumferential direction occupied by each of the coil springs about the axis is 180 degrees or less when the coil springs are disposed in the second helical groove.Type: GrantFiled: September 24, 2019Date of Patent: June 29, 2021Assignee: JTEKT CORPORATIONInventors: Akiyoshi Tashiro, Hirofumi Dodoro
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Patent number: 11045920Abstract: A machining apparatus machines an end face of a tapered roller with a grinding wheel. The machining apparatus includes a support mechanism configured to support the tapered roller, a wheel unit on which the grinding wheel is mounted, and a base configured to support the wheel unit so that the wheel unit is swivelable about a center line in a vertical direction. A machining point where the grinding wheel is brought into contact with the end face of the tapered roller supported by the support mechanism is located on an extension of the center line serving as a swivel center of the wheel unit.Type: GrantFiled: February 20, 2018Date of Patent: June 29, 2021Assignee: JTEKT CORPORATIONInventors: Hirokazu Okubo, Atsushi Kuno, Kenichiro Kitamura
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Publication number: 20210188344Abstract: A power-steering device includes a steering wheel and an assistance motor controlled by a controller which uses at least one closed-loop control law ensuring an adjustment of the steering wheel torque, the controller including at least one feedback arm which calculates a drift component by measuring or assessing an actual force parameter corresponding to the actual steering wheel torque, by next calculating a time drift value of the actual force parameter, and then multiplying the time drift value by a drift gain, wherein the controller uses three-dimensional cartography to adjust the drift gain according to a portion of the actual force parameter and the longitudinal velocity of the vehicle, according to a first domain, referred to as “parking domain”, which extends from a longitudinal vehicle velocity of zero to a predetermined longitudinal velocity threshold, and a second domain, referred to as “driving domain”, which extends beyond the longitudinal velocity threshold.Type: ApplicationFiled: September 24, 2018Publication date: June 24, 2021Applicant: JTEKT EUROPEInventors: Pascal MOULAIRE, André MICHELIS, Serge GAUDIN
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Publication number: 20210179163Abstract: A telescopic shaft includes an internal shaft having an external toothing on an outer peripheral surface, an external shaft having an internal toothing on an inner peripheral surface, and a sliding member arranged between the external toothing and the internal toothing and fixed to one of the external toothing and the internal toothing. The sliding member is slidable in an axial direction relative to the other one of the external toothing and the internal toothing. The sliding member includes a wall at an end between the sliding member and the other one of the external toothing and the internal toothing. The wall protrudes toward the other one of the external toothing and the internal toothing.Type: ApplicationFiled: December 7, 2020Publication date: June 17, 2021Applicant: JTEKT CORPORATIONInventor: Hiroyasu TOMIMATSU