Patents Assigned to JTEKT
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Patent number: 8855858Abstract: A motor control unit includes a detected steering torque correction unit that corrects the detected steering torque that is detected by a torque sensor and then subjected to a limitation process by a steering torque limiter. When the absolute value of the detected steering torque is equal to or smaller than a predetermined value, the detected steering torque correction unit corrects the detected steering torque to 0. When the absolute value of the detected steering torque is larger than the predetermined value, the detected steering torque correction unit outputs the detected steering torque without correction. A PI control unit calculates the addition angle based on the deviation of the control torque obtained through correction by the detected steering torque correction unit from the command steering torque.Type: GrantFiled: November 12, 2010Date of Patent: October 7, 2014Assignee: Jtekt CorporationInventors: Yuji Kariatsumari, Terutaka Tamaizumi, Yoshinobu Shimizu
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Patent number: 8851758Abstract: A bearing device includes: an outer ring having an outer ring raceway groove on its inner circumferential surface; an inner ring having an inner ring raceway groove on its outer circumferential surface; balls arranged between the outer and inner ring raceway grooves; a retainer retaining the balls; and a liquid lubricant supply device supplying oil content of grease to the space between the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring. The liquid lubricant supply device includes a liquid lubricant passage providing fluid communication between the inner circumferential surface and the outer circumferential surface; and a vibrating device contacting the grease to vibrate the grease to supply a liquid lubricant to the space between the inner circumferential surface and the outer circumferential surface via the liquid lubricant passage.Type: GrantFiled: December 10, 2010Date of Patent: October 7, 2014Assignee: JTEKT CorporationInventor: Yuichiro Hayashi
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Patent number: 8851761Abstract: In a split cage for a rolling bearing, cage segments each having a plurality of pockets that accommodate rolling elements are arranged in a circular manner along the circumferential direction. Protrusions are formed on end faces of rims of one of the adjacent cage segments, and grooves are formed in end faces of rims of the other one of the adjacent cage segments. By fitting the protrusions into the grooves, the adjacent cage segments are prevented from moving relative to each other in the radial direction.Type: GrantFiled: May 20, 2013Date of Patent: October 7, 2014Assignee: JTEKT CorporationInventor: Takeshi Miyachi
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Patent number: 8855862Abstract: 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: GrantFiled: September 7, 2012Date of Patent: October 7, 2014Assignee: Jtekt CorporationInventor: Takashi Tashiro
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Patent number: 8851957Abstract: A grinding method includes the steps of holding a workpiece by a pair of centering members of a pair of spindle equipment, shifting two centering members to one side of a spindle rotational axis, facing a grinding wheel at the other side to the other end portion of the workpiece, grinding the other end portion of the workpiece by the grinding wheel at the other side by rotating a driving pin of the spindle equipment at one side, retracting the grinding wheel at other side and stopping the rotation of the driving pin at one side and also shifting two centering members to the other side of the spindle rotational axis, facing a grinding wheel at one side to one end portion of the workpiece, and grinding one end portion of the workpiece by the grinding wheel at one side by rotating a driving pin of the spindle equipment at the other side.Type: GrantFiled: June 3, 2011Date of Patent: October 7, 2014Assignee: JTEKT CorporationInventors: Toshiaki Naya, Kikutoshi Okada
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Patent number: 8855859Abstract: A steering angle detecting unit, a reaction force actuator that applies steering reaction force to a steering member, a yaw angle detecting unit that detects a yaw angle of a vehicle body, and a reaction force actuator control unit that sets the steering reaction force as a function of a steering angle and that controls the reaction force actuator such that the reaction force actuator generates the set steering reaction force, are provided. The reaction force actuator control unit computes a turning angle of the vehicle body on the basis of a change in the yaw angle of the vehicle body, detected by the yaw angle detecting unit. When the computed turning angle is larger than or equal to a reference angle, the steering reaction force applied to the steering member is increased.Type: GrantFiled: October 30, 2012Date of Patent: October 7, 2014Assignee: JTEKT CorporationInventor: Ryouhei Hayama
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Patent number: 8851869Abstract: In an internal gear pump that includes an inner gear having outer teeth and an outer gear having inner teeth, either the inner or outer teeth have a shape based on a tooth shape that is respectively formed by a generating curve of the outer or inner teeth. The inner teeth are arc-shaped, the outer teeth are curved-shaped, and both end sections of the curved shape are arc-shaped. If a radius of the arc shape of the inner teeth is set as ro, a radius of the arc shape of each of the corner sections is set as ri, a diameter of a pitch circle of the inner teeth is set as dp, and the number of the inner teeth is set as z, the inner gear and the outer gear each has a shape that satisfies a relationship established by following equations: 1.6>ro/(dp/z)>1.0; and ro/(dp/z)>ri/(dp/z)?0.13.Type: GrantFiled: December 5, 2012Date of Patent: October 7, 2014Assignees: JTEKT Corporation, Toyooki Kogyo Co., Ltd.Inventors: Yoshihiro Oono, Motoyasu Yamamori, Daichi Kanda, Kenichi Takagi
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Publication number: 20140291062Abstract: A drainage device of an electric power steering system has a drain case and a drain valve. The drain case has a groove portion formed in a peripheral edge portion of a case inlet. The drain valve has a main body, and a flange disposed so as to face the case inlet. The flange has a bulged portion bulged toward the case inlet, and an annular seal portion. When the seal portion is brought into tight contact with the peripheral edge portion of the case inlet, the drainage device is placed in a valve closed state to form an annular space between the groove portion and the seal portion. When the seal portion is elastically deformed to form a gap between the seal portion and the peripheral edge portion of the case inlet, the drainage device is placed in a valve open state.Type: ApplicationFiled: March 19, 2014Publication date: October 2, 2014Applicant: JTEKT CORPORATIONInventor: Hirokazu TOJO
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Publication number: 20140297122Abstract: A vehicle steering system includes an axial force sensor that detects a vibration of a vehicle wheel; and a control device including an FFT analysis unit that resolves the vibration of the vehicle wheel into a power spectrum. The control device executes compensation assist control that suppresses one of a deflection of the vehicle and a vibration of a steering component that are caused by a puncture or a burst of the vehicle wheel, based on the vibration calculated based on a radius of the vehicle wheel when the vehicle wheel is normal and a vehicle speed and an abnormal-wheel frequency calculated based on a radius of the vehicle wheel when the vehicle wheel is punctured or burst and the vehicle speed.Type: ApplicationFiled: March 21, 2014Publication date: October 2, 2014Applicant: JTEKT CORPORATIONInventor: Tatsuma KOUCHI
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Publication number: 20140290413Abstract: There is provided a vehicle steering system that facilitates fine steering of a vehicle body regardless of the operated state of a steering wheel. The steering wheel is provided with a lever used to operate the steering wheel. A support mechanism supports and rotates the lever relative to the steering wheel such that the lever is tiltable in the rightward direction and the leftward direction relative to the vehicle body regardless of a turning angle of the steering wheel. The support mechanism includes a support member fixed to the steering wheel, a base disposed on the support member and rotatably supported by the support member, and a gear mechanism used to rotate the base as the steering wheel is turned.Type: ApplicationFiled: March 24, 2014Publication date: October 2, 2014Applicant: JTEKT CORPORATIONInventors: Takashi TASHIRO, Akihiro TAKAZATO
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Publication number: 20140297144Abstract: A microcomputer of a driving force distribution control device detects a maximum current value among values of an upper current acquired during a predetermined period, and determines that an overcurrent abnormality has occurred in the driving force distribution control device when the maximum current value is equal to or larger than an abnormal current threshold value and a time, for which the maximum current value is equal to or larger than the abnormal current threshold value, is equal to or larger than an abnormality detection time. Then, the microcomputer performs off control to turn off a relay, and notifies a driver of occurrence of the overcurrent abnormality using a notification unit.Type: ApplicationFiled: March 24, 2014Publication date: October 2, 2014Applicant: JTEKT CorporationInventor: Hisaaki Wakao
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Publication number: 20140290410Abstract: In an electric power steering system, there is provided a ball screw deflector configured to make it possible to easily measure the whole length of each of deflector pieces. A mating face of each of the deflector pieces and end faces of the deflector pieces are parallel to each other, and have an angle corresponding to a lead angle of a ball screw portion. Thus, it is possible to reduce the amount of material required to form each of the deflector piece pieces. In addition, it is possible to easily measure the overall length of each of the deflector pieces with the use of measuring equipment such as a vernier caliper.Type: ApplicationFiled: March 21, 2014Publication date: October 2, 2014Applicant: JTEKT CORPORATIONInventors: Toshihiro ASAKURA, Tetsuya KANEKO, Satoshi FUJITA
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Publication number: 20140294644Abstract: A pump includes: a housing in which a pump chamber that is a columnar space is formed, the pump chamber being provided with a suction-side groove and a discharge-side groove that are formed as recesses; an outer rotor rotatably disposed in the pump chamber and having internal teeth on an inner periphery of the outer rotor; and an inner rotor disposed radially inward of the internal teeth of the outer rotor, and having external teeth formed on an outer periphery of the inner rotor and meshed with the internal teeth of the outer rotor. A portion of an inner edge of the discharge-side groove is located radially inward of a locus of tooth tips of the internal teeth of the outer rotor, the portion being located in a second half region of the discharge-side groove in a rotational direction of the inner rotor and the outer rotor.Type: ApplicationFiled: March 24, 2014Publication date: October 2, 2014Applicant: JTEKT CorporationInventors: Masahiko SUZUKI, Kenichi Takagi
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Publication number: 20140298225Abstract: A screen definition device includes a screen data generating unit that outputs screen data generated by combining model screen data in which section information is set, with screen definition tables for the model screen data; a screen data combining unit that combines the screen data with the other screen data based on a reference relation indicated by link information of the screen data and the link information of the other screen data; and a screen definition table setting unit that sets screen definition tables in a table form.Type: ApplicationFiled: March 24, 2014Publication date: October 2, 2014Applicant: JTEKT CorporationInventors: Terukazu SENDA, Kentaro TAKASU
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Publication number: 20140297098Abstract: A test system includes an actual machine including a test piece that is a mechanical element of a vehicle, the actual machine being installed in a first location; a control device that is installed in the first location, and controls the actual machine; a model installed in a second location away from the first location; and a data processor that is installed in the second location, and is connected to the actual machine or the control device via a communication line so that data communication is performed, the data processor acquiring data from the actual machine via the communication line so that an operation test is performed. The data processor calculates a target value for controlling the actual machine based on an output acquired by inputting the acquired data to the model, and the control device controls the actual machine based on the target value.Type: ApplicationFiled: March 24, 2014Publication date: October 2, 2014Applicant: JTEKT CORPORATIONInventors: Hiroshi YOSHIMOTO, Tomoyasu KADA, Ryouhei HAYAMA, Masaharu TAGAMI, Aris MAROONIAN
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Publication number: 20140285049Abstract: A magnet-embedded rotor includes a cylindrical rotor core that rotates together with a rotating shaft; and permanent magnets embedded in the rotor core. The rotor core includes core members, and each core member includes a tubular portion into which the rotating shaft is inserted and projecting portions formed to project in a radial direction of the tubular portion from an outer periphery of the tubular portion and arranged apart from each other in a circumferential direction of the tubular portion. The rotor core is formed by assembling the core members such that the tubular portions are arranged on one straight line and the projecting portion of the core member and the projecting portion of the other core member are adjacent to each other in a circumferential direction of the rotor core. The permanent magnet is embedded in each projecting portion of each core member.Type: ApplicationFiled: March 19, 2014Publication date: September 25, 2014Applicant: JTEKT CORPORATIONInventors: Keita NIMURA, Naotake KANDA, Ryosuke YAMAGUCHI
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Publication number: 20140286598Abstract: A sliding member is integrally formed of fluororesin as a whole, and a sliding surface to be slid with a slid member is made hydrophilic. A manufacturing method includes a step of exposing the sliding surface 2 of the sliding member 1 to water plasma 7 generated by Ar gas and vaporized water as raw materials and making the sliding surface 2 hydrophilic.Type: ApplicationFiled: March 14, 2014Publication date: September 25, 2014Applicants: NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY, JTEKT CORPORATIONInventors: Masahiro SUZUKI, Toshiyuki SAITO, Noritsugu UMEHARA, Shingo KAWARA, Takayuki TOKOROYAMA, Hiroyuki KOUSAKA
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Publication number: 20140287854Abstract: A chain (endless flexible member) is looped over an input pulley and an output pulley. Each of the input pulley and the output pulley includes a pair of a fixed sheave and a movable sheave. The fixed sheave and the movable sheave have tapered faces that are opposed to each other to define a V-shaped groove. A vibration damping plate (vibration damping member) is fixed to each fixed sheave, and is in contact with the outer peripheral face of the fixed sheave. When the fixed sheave vibrates, the vibrations are damped by the friction between the outer peripheral face of the fixed shave and the vibration damping plate.Type: ApplicationFiled: March 14, 2014Publication date: September 25, 2014Applicant: JTEKT CORPORATIONInventors: Shinji YAMANE, Keisuke MORI, Teruhiko NAKAZAWA, Haruhiro HATTORI
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Publication number: 20140286602Abstract: A rolling bearing unit includes: a rolling bearing; a grease reservoir in which grease is reserved; an outer ring spacer disposed adjacent to an outer ring of the rolling bearing; and a bellows-shaped grease medium that connects a second side wall that defines the grease reservoir on the outer ring spacer side, to a step portion of the outer ring. The grease medium is disposed so as to be impregnated with a base oil contained in the grease.Type: ApplicationFiled: March 14, 2014Publication date: September 25, 2014Applicant: JTEKT CORPORATIONInventor: Kiyoshi TANIMOTO
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Publication number: 20140286809Abstract: A pump includes a second housing member in which a suction-side groove and a discharge-side groove are formed at a predetermined interval in a circumferential direction of a bottom of a pump chamber so as to be recessed in the bottom of the pump chamber. Fitting portions that are fitted to bosses are formed on an outer surface of the second housing member. A protruding portion, which overlaps with the bosses in a thickness direction, is formed so as to protrude from a surface of the housing on which the fitting portions are formed. A relief valve is provided in the protruding portion, and the relief valve discharges fluid from the discharge-side groove when pressure in the discharge-side groove is equal to or higher than predetermined pressure.Type: ApplicationFiled: March 18, 2014Publication date: September 25, 2014Applicant: JTEKT CorporationInventors: Junichi Miyaki, Takatoshi Sakata
