Patents Assigned to JTEKT
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Publication number: 20190135333Abstract: Provided is a steering control apparatus in which the response of steering assistance to driver's steering can be improved during execution of rotation angle sensor-less control. When the rotation angle sensor-less control is executed and when an induced voltage value is equal to or lower than a threshold voltage, driving of a motor is controlled based on a second addition angle. The second addition angle is calculated such that values obtained by multiplying a first pre-addition angle calculated based on a steering torque and a second pre-addition angle calculated based on an induced voltage derivative by respective predetermined use ratios that are based on the induced voltage value are added together. By using the second addition angle, a more appropriate estimated electrical angle is calculated in response to a driver's steering situation.Type: ApplicationFiled: October 31, 2018Publication date: May 9, 2019Applicant: JTEKT CORPORATIONInventors: Hidenori ITAMOTO, Takashi KAGEYAMA, Toshie HIBI
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Publication number: 20190140520Abstract: 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: ApplicationFiled: November 2, 2018Publication date: May 9, 2019Applicant: JTEKT CORPORATIONInventor: Yuto SATO
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Patent number: 10280978Abstract: In a tapered roller bearing, a large rib is provided at one end of an inner ring in the axial direction, and projects radially outward. A lubricating oil holding member is integrated with an outer ring, and disposed at a position overlapping the large rib in the radial direction. The lubricating oil holding member includes a tubular portion and an annular portion. An inclined surface is disposed on the outer peripheral surface of the large rib at one end in the axial direction. The distance from the rotational axis of the inner ring to the inclined surface becomes larger from one side in the axial direction toward the other side. An end of the inclined surface is positioned, in the axial direction, between the annular portion and one end of the outer ring in the axial direction.Type: GrantFiled: December 14, 2017Date of Patent: May 7, 2019Assignee: JTEKT CORPORATIONInventors: Akiyuki Suzuki, Ryo Shiina
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Patent number: 10279836Abstract: A steering system includes: a steering shaft to which a steering member is coupled; a worm wheel attached to the steering shaft so as to be rotatable integrally with the steering shaft; a housing that houses the worm wheel; an output shaft that is coaxial with the steering shaft and rotatable relative to the steering shaft and coupled to a steering operation mechanism; and a clutch mechanism that enables and disables transmission of power between the steering shaft and the output shaft. The clutch mechanism is housed and disposed in an internal space in the housing. A solenoid in the clutch mechanism is disposed on the opposite side of the worm wheel in an axial direction from a mechanical portion of the clutch mechanism.Type: GrantFiled: June 8, 2016Date of Patent: May 7, 2019Assignee: JTEKT CORPORATIONInventor: Akihiko Shiina
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Patent number: 10282926Abstract: A computer for a motor vehicle including at least one main control module intended to manage an onboard system such as a power steering system, which uses a plurality of internal variables representative of the successive life situations of the vehicle, the computer including, in addition to the main control module, an integrated monitoring module that includes an extraction and recording unit, placed under the dependency of a trigger unit in order to extract, from a buffer memory, in case of a detection of a predefined alarm event occurring at a triggering time, one or more recordings, that correspond respectively to one or more internal variables, and that each cover a time interval that extends from a start time that precedes the triggering time to an end time that follows the triggering time, and then to store the recording or recordings in a non-volatile memory.Type: GrantFiled: August 4, 2015Date of Patent: May 7, 2019Assignee: JTEKT EUROPEInventors: Jean-Luc Deville, Pierre-Willem Pilaz
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Patent number: 10284063Abstract: A plurality of flux barriers in each of flux barrier groups include arcuate portions formed in a polygonal region. The arcuate center of the arcuate portions in each of the flux barrier groups is set to the circumferential center point of the flux barrier group on the outer peripheral edge of a rotor. When regions of the rotor interposed between two flux barriers that are adjacent to each other in the flux barrier groups are defined as ribs, and portions of the rotor that are close to the outer periphery of the rotor in the regions of the rotor interposed between flux barrier groups that are adjacent to each other are defined as connecting portions, the ratio of the width of the connecting portions to the width of the ribs is 0.53 or more and 0.8 or less.Type: GrantFiled: March 20, 2017Date of Patent: May 7, 2019Assignee: JTEKT CORPORATIONInventor: Mingyu Tong
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Patent number: 10279835Abstract: In a steering system, a guide member faces the rack shaft on the opposite side of the rack shaft from the pinion shaft, and an opposed member faces the guide member at a first distance. The rack shaft is supported by the first rack bush so as to be slidable in the axial direction. The rack shaft is supported so as to be slidable in the axial direction X at a position closer to the guide member than the first rack bush is by the second rack bush disposed away from the inner surface. An elastic member that can be elastically deformed is disposed between the inner surface and the second rack bush. The second rack bush has an opposed portion disposed on the opposite side of the rack shaft from the pinion shaft and facing the inner surface at a second distance that is larger than the first distance.Type: GrantFiled: August 10, 2016Date of Patent: May 7, 2019Assignee: JTEKT CORPORATIONInventor: Akitake Kawakubo
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Patent number: 10274938Abstract: A numerical control unit is provided that can change an override value according to various workpiece materials and can extend the tool life. A numerical control unit includes a variation storage unit that stores a variation in override value of a feed speed or a spindle speed for each workpiece material, an override value setting unit that sets the override value based on the variation in override value according to the material of a workpiece being machined; and a control unit that changes the feed speed or the spindle speed based on the override value.Type: GrantFiled: March 9, 2015Date of Patent: April 30, 2019Assignee: JTEKT CORPORATIONInventors: Katsuhiro Maseki, Tatsuhiko Inagaki, Hiroyuki Tsusaka, Kazuhiro Tsujimura
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Patent number: 10272776Abstract: A four-wheel drive vehicle includes a friction clutch that transmits a driving force to rear wheels, a hydraulic circuit including a control valve that reduces a pressure of hydraulic oil discharged from a hydraulic pump down to a control pressure corresponding to a control current, and the cylinder and a piston that receives the oil from hydraulic circuit the to press the friction clutch. In the hydraulic circuit, a ratio of an change amount in a feeding pressure to the cylinder to an change amount in the control current, when the feeding pressure to the cylinder is lower than a predetermined value, is lower than when the feeding pressure applied to the cylinder is equal to or higher than the predetermined value. The control apparatus controls a pressure of the hydraulic oil fed to the cylinder lower than the predetermined value when switching the driving state.Type: GrantFiled: December 19, 2016Date of Patent: April 30, 2019Assignee: JTEKT CORPORATIONInventors: Yoshinori Suzuki, Yasufumi Nakamura, Kaori Fujita
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Patent number: 10272941Abstract: A vehicle steering device, in which a steering member and a steering operation mechanism are not mechanically coupled, includes a reaction force motor that applies a reaction force to the steering member, and a reaction force motor control unit that controls the reaction force motor. The reaction force motor control unit includes a target rotational angle setter that sets a target rotational angle for an output shaft at a position close to the side of the neutral position of the output shaft with respect to the rotational angle of the output shaft corresponding to a steered angle limit value by a rotational angle matching steering torque detected by a torque sensor when a steered angle has reached the steered angle limit value and the steering torque that is larger than the steering torque at the time when the steered angle limit value was reached is applied to a steering wheel.Type: GrantFiled: October 26, 2016Date of Patent: April 30, 2019Assignee: JTEKT CORPORATIONInventors: Masahiko Sakamaki, Keisuke Izutani
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Patent number: 10278271Abstract: In a facility management system, a controller that constitutes an information acquisition device attached to a signal lamp executes: an acquisition process of acquiring light emission information using a sensor; a transmission process of wirelessly transmitting the light emission information after the acquisition process; and a hibernation process of bringing the controller into a hibernation state corresponding to a power-saving mode in a period from the transmission process to the next acquisition process. The time of the hibernation process is a variable time set in accordance with a hibernation random number.Type: GrantFiled: September 26, 2018Date of Patent: April 30, 2019Assignee: JTEKT CORPORATIONInventor: Yuta Sahara
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Patent number: 10274014Abstract: A rolling bearing device includes: a bearing portion that has an inner ring, an outer ring, a plurality of balls interposed between the inner ring and the outer ring, and a cage that holds the plurality of balls; and an oil supply unit provided adjacent to the bearing portion in the axial direction. The oil supply unit has a pump configured to supply lubricating oil to the bearing portion. The pump has a pump body provided with a nozzle that discharges lubricating oil and a vibration element that vibrates the pump body.Type: GrantFiled: November 17, 2017Date of Patent: April 30, 2019Assignee: JTEKT CORPORATIONInventors: Yoshimichi Higashiyama, Masami Naka, Tsukasa Sakazaki
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Publication number: 20190120367Abstract: A planetary roller transmission includes: a fixed ring; a sun shaft; a plurality of planetary rollers; a carrier that has a plurality of support shafts that support the planetary rollers via bearing portions and that revolves together with the planetary rollers; and an annular flange ring provided on one side, in the axial direction, of the fixed ring and the planetary rollers. The inside diameter of the flange ring is smaller than the diameter of a circumscribed circle circumscribed by bearing portions which are arranged in the circumferential direction. An oil storage portion that receives oil that has climbed over the flange ring from the side of the planetary rollers is provided between a side surface of the flange ring and an inner wall surface of the housing. A passage that allows oil to permeate from the oil storage portion to the side of the planetary rollers is provided.Type: ApplicationFiled: October 18, 2018Publication date: April 25, 2019Applicant: JTEKT CORPORATIONInventors: Hajime WATANABE, Yuichi MATSUMOTO
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Publication number: 20190123621Abstract: A motor device that can secure the detection precision of the rotational angle of a motor is provided. A motor device has a motor housing, a heat sink, a motor cover, a motor, and a substrate. An opening portion of the motor housing is covered by the motor cover which is made of a magnetic body such as iron in a roofed tubular shape. A choke coil is provided on a surface of the substrate on the side opposite to the motor. A magnetic sensor is provided on a surface of the substrate on the side of the motor. A housing portion is provided at a roof portion of the motor cover. The choke coil, which is mounted on the substrate, is surrounded by the housing portion.Type: ApplicationFiled: October 12, 2018Publication date: April 25, 2019Applicant: JTEKT CORPORATIONInventors: Tomohiro HIGASHIDE, Yuto SATO
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Patent number: 10266198Abstract: There is provided a motor control device capable of preventing occurrence of a difference in command value between control systems and reducing torque ripples and noise and vibration of a motor, unlike in a case where a motor is controlled by control systems that are independent from each other. In a motor control device, at least one of parameters for a first control system is shared by both of the systems, and a first control calculation circuit and a second control calculation circuit calculate the assist command values based on the parameter. Thus, motor drive circuits of the control systems drive motor coils based on the assist command values. Namely, when the steering torques and the vehicle speeds for the control systems are all normal, assist control circuits of the control systems calculate the assist command values based on the steering torque and the vehicle speed.Type: GrantFiled: August 4, 2017Date of Patent: April 23, 2019Assignee: JTEKT CORPORATIONInventors: Yuji Fujita, Hiroshi Kawamura, Atsuo Sakai
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Patent number: 10267400Abstract: A differential apparatus includes a differential mechanism, a differential case that accommodates the differential mechanism, and a clutch mechanism that transmits a driving force between the differential case and the differential mechanism. The clutch mechanism includes a side member movable inside the differential case in an axial direction and an actuator for moving the slide member to the axial direction. The slide member has a first meshable portion at one end in the axial direction, is allowed to move relative to the differential mechanism, and is prevented from rotating relative to the differential mechanism. The differential case has a second meshable portion facing the first meshable portion in the axial direction.Type: GrantFiled: April 3, 2017Date of Patent: April 23, 2019Assignee: JTEKT CORPORATIONInventors: Yasunori Kamitani, Minoru Onitake, Tadashi Yoshisaka, He Jin
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Patent number: 10266129Abstract: Provided is a vehicle control system that appropriately performs synchronization control for a plurality of control systems. A monitoring circuit generates a command signal when only a first reset signal is input. The monitoring circuit generates a command signal when the state in which only the first reset signal is input is changed to the state in which the input of the first reset signal is stopped. With the command signal, a second clock signal is output to a timer generator as a second timing signal. With the command signal, the second clock signal generated by a second synchronization signal generating circuit is output to a first synchronization signal generating circuit, and a third clock signal generated by the first synchronization signal generating circuit is output to a timer generator as a first timing signal.Type: GrantFiled: April 3, 2018Date of Patent: April 23, 2019Assignee: JTEKT CORPORATIONInventors: Takehiro Ito, Satoru Mikamo, Yuji Fujita
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Patent number: 10266053Abstract: A controller for a driving force transmitting apparatus mounted in a four-wheel-drive vehicle, includes: a driving force controller configured to calculate a command torque indicating a driving force to be transmitted to the sub-drive wheels via the driving force transmitting apparatus based on a traveling state of the four-wheel-drive vehicle and a road surface condition, and to control the driving force transmitting apparatus based on the command torque; and a road surface condition determiner configured to determine that the road surface condition is a high-? condition when a duration of a non-slipping state where a vehicle speed is equal to or higher than a prescribed value and a slip ratio of each of both the main drive wheels is lower than a prescribed value has become equal to or longer than a prescribed time.Type: GrantFiled: October 4, 2017Date of Patent: April 23, 2019Assignee: JTEKT CORPORATIONInventors: Hirokazu Kondo, Tomoaki Kato, Go Nagayama, Akiyoshi Kakita
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Publication number: 20190113079Abstract: An oil supply unit has: a pump that has a pressure chamber portion that stores lubricating oil and a piezoelectric element that is deformable by application of a voltage, the pump ejecting lubricating oil in the pressure chamber portion; a tank that is connected to the pump and that stores lubricating oil to be supplied to the pump for replenishment; a sensor that detects a pressure in an oil region which extends from the pressure chamber portion to the tank and in which lubricating oil is present, or the state of a bearing portion; a pressure adjustment portion that adjusts a pressure of lubricating oil in the oil region which extends from the pressure chamber portion to the tank; and a control portion that controls at least one of the pressure adjustment portion and the piezoelectric element on the basis of a detection result from the sensor.Type: ApplicationFiled: October 9, 2018Publication date: April 18, 2019Applicant: JTEKT CORPORATIONInventors: Tsukasa SAKAZAKI, Yusuke UEDA, Yoshimichi HIGASHIYAMA
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Publication number: 20190113405Abstract: Provided is a sensor device that is machinable and mountable easily. A sensor device includes an external gear configured to rotate together with a pinion shaft, driven gears configured to rotate by meshing with the external gear, permanent magnets configured to rotate together with the driven gears, magnetic sensors configured to detect magnetic fields of the permanent magnets, a circuit board assembly having the magnetic sensors mounted on a printed circuit board, a tubular first housing member that houses the external gear, and a second housing member that supports the driven gears and houses the circuit board assembly. The second housing member has a flange portion that abuts against an open end face of a fitting hole of the first housing member, and parts of the driven gears that protrude from the flange portion mesh with the external gear inside the first housing member.Type: ApplicationFiled: October 5, 2018Publication date: April 18, 2019Applicant: JTEKT CORPORATIONInventor: Yuichi TOYAMA
