Abstract: A sensor includes a main drive gear mounted on a shaft that is subjected to detection by the sensor such that the main drive gear is rotatable integrally with the shaft; at least one driven gear meshing with the main drive gear; a sensor housing accommodating the main drive gear and the at least one driven gear; a biasing member biasing the at least one driven gear toward the main drive gear; and a conversion mechanism configured to convert an axial force that is parallel to an axial direction of the shaft and acts on the at least one driven gear to a force in such a direction that the at least one driven gear is separated from the main drive gear when a part of the at least one driven gear contacts a part of the main drive gear while the shaft is inserted in the sensor housing.
Abstract: A sensor includes a permanent magnet mounted on a shaft, a magnetic yoke, a magnetism collecting ring, a circuit board, and a sensor housing through which the shaft is inserted. The sensor housing has a box-shaped accommodating chamber accommodating at least the circuit board via an opening that opens in a direction crossing an axial direction of the shaft. A reinforcing member connecting two wall surfaces of the accommodating chamber that face each other in the axial direction of the shaft is provided in the accommodating chamber.
Abstract: When a steering angle reaches a first value close to a second value that defines a boundary of the maximum physical range of operation of a steering wheel, an ECU calculates a virtual end controlled variable that sharply increases a steering torque. The ECU calculates a second limit on the virtual end controlled variable and calculates a final limit (upper and lower limits) on an assist controlled variable by taking into account the second limit. When performing virtual end control, the ECU calculates the final limit on the assist controlled variable by using, as a first limit corresponding to the steering torque, a previous value held by upper and lower limit holders, instead of a present value calculated in accordance with the steering torque in a present calculation cycle.
Abstract: A steering control device that can more appropriately transmit a road-surface reaction force to a steering wheel is provided. The steering control device feedback controls a steering angle to a target steering angle that is a target value of the steering angle. The steering control device includes an estimated axial force computation circuit that computes an estimated axial force so as to reflect a road-surface reaction force in a reaction force generated by a reaction force actuator. The estimated axial force computation circuit computes the estimated axial force by causing a friction compensation amount computation circuit and an efficiency compensation gain computation circuit to compensate an initial estimated axial force computed by an initial estimated axial force computation circuit.
Abstract: A cage assembly is moved in the axial direction to approach an inner ring from a small rib portion side. An inner ring assembly is constituted by causing tapered rollers of the cage assembly to climb over a small rib portion to be fitted on an inner raceway surface, and then is assembled to an outer ring. In this method, a jig is provided adjacent to the small rib portion. The jig includes recessed grooves that are formed in the outer peripheral portion of the jig and that enable contact of the respective tapered rollers. Each recessed groove has a recessed arcuate shape in cross section. The tapered rollers of the cage assembly are caused to slide radially outward along the recessed grooves, so that the diameter of cage is increased. Accordingly, the tapered rollers climb over the small rib portion to be fitted on the inner raceway surface.
Abstract: A gear unit includes: a first gear and a second gear which are disposed about a first axis; an input shaft disposed so as to be rotatable about the first axis; and an intermediate gear disposed between the first gear and the second gear. The intermediate gear is disposed about a second axis tilted with respect to the first axis. The intermediate gear includes an inner ring portion and an outer ring portion disposed so as to be rotatable relative to the inner ring portion. The inner ring portion is configured to be rotated with rotation of the input shaft. The outer ring portion is configured to mesh with the first gear and the second gear.
Abstract: A control device for a vehicle according to the disclosure is provided. The vehicle includes a steering device, a braking and driving force generation device, a steered angle state quantity sensor and a vehicle wheel speed sensor. The control device includes an electronic control unit configured to control an operation of the braking and driving force generation device, to calculate an actual traveling direction which is an actual direction of travel of the vehicle, based on the vehicle wheel speed of each of the right and left steered wheels and the steered angle state quantity, and to cause the actual traveling direction to follow a target traveling direction which is a target direction of travel of the vehicle.
Abstract: A method of manufacturing an outside joint member, the outside joint member including a cup portion in a bottomed tubular shape and a shaft portion that is a shaft-like portion extending from a bottom portion of the cup portion and that has a spline shaft having an outer peripheral surface on which spline teeth are formed, includes forging a forming material to form a shape of the cup portion and a shape of the spline shaft on the shaft portion simultaneously using a forging die.
Abstract: A steering system includes a rod member, a housing, and a clamping member. The housing has a clamping slit and includes a first clamp-receiving portion and a second clamp-receiving portion that project so as to sandwich the clamping slit therebetween. The clamping member includes a fixed cam, a clamping shaft, a rotary cam, and a clamping lever. The fixed cam is fitted in the first clamp-receiving portion from an outer side of the first clamp-receiving portion. The fixed cam has a third through hole extending through the fixed cam coaxially with a first axis. The third through hole has a small diameter portion at a first portion close to the rotary cam and a large diameter portion having a diameter larger than a diameter of the small diameter portion at a second portion away from the rotary cam.
Abstract: To provide a quality prediction system predicting a quality element of a molded item using machine learning. The quality prediction system includes a sensor disposed in the mold and configured to detect state data regarding the molten material supplied in the cavity, a learned-model storage unit configured to store a model which is a learned model generated by machine learning in which the state data detected by at least the sensor is used as a training data set and is a learned model related to the state data and a quality element of the molded item, and a quality prediction unit configured to predict the quality element of the molded item which is newly molded based on the state data newly detected by the sensor and the learned model.
Abstract: An auxiliary power supply device includes an auxiliary power source and a booster circuit. The auxiliary power supply device is configured to be switched among a charging state, a holding state, and a discharging state. The auxiliary power source is configured to be switched between a serial connection mode and a parallel connection mode. The auxiliary power source is configured to perform boosting to supply power to the power supply target when the auxiliary power source is switched to the serial connection mode, and perform backup when the auxiliary power source is switched to the parallel connection mode.
Abstract: A steering control device includes a command value setting processing portion configured to set a current command value based on a detection value of steering torque; a feedback processing portion configured to control a voltage applied to a motor so as to control a current flowing through the motor to the current command value, based on an output value of an integral element obtained by using a difference between the current and the current command value; an end determination processing portion configured to determine whether a turning angle of steered wheels has reached a limit angle; and an end-time limit processing portion configured to perform correction to increase a magnitude of the difference, based on a degree of a decrease in a magnitude of a rotational speed of the motor when the end determination processing portion determines that the turning angle has reached the limit angle.
August 11, 2017
Date of Patent:
June 30, 2020
JTEKT CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA, DENSO CORPORATION
Abstract: A steering system includes a prioritized torque sensor, a redundant torque sensor, a controller, a first signal line, a second signal line, and a common signal line. Each of the first signal line and the second signal line connects the prioritized torque sensor and the controller. The common signal line connects the redundant torque sensor and the controller. The prioritized torque sensor is configured to transmit, via the first signal line, a first prioritized detection signal. The prioritized torque sensor is configured to transmit, via the second signal line, a second prioritized detection signal. The redundant torque sensor is configured to transmit, via the common signal line, a first redundant detection signal and a second redundant detection signal.
Abstract: A motor controller is configured to control a motor including a plurality of winding groups. The motor controller includes a plurality of processors. Each of the processors is configured to independently control supply of driving electric power to each of the winding groups. When an abnormality occurs in which a torque to be generated in one of the winding groups is smaller than an individual rated torque and when a target overall torque is larger than a total of the individual rated torque for the winding group in which the abnormality does not occur, the processor, controlling supply of driving electric power to the winding group in which the abnormality does not occur, out of the plurality of processors controls supply of the driving electric power such that the winding group generate a torque larger than the individual rated torque.
Abstract: A steering apparatus includes: a column shaft; a column tube supporting the column shaft; a housing movably supporting the column tube; a fastener configured to fix the position of the column tube by pressing on radial ends of the housing; a first impact absorber configured to generate a first dynamic friction force with the column tube; and a second impact absorber configured to generate a second dynamic friction force with the housing during a secondary collision by being moved by the first impact absorber. The first impact absorber is structured such that a distal static friction coefficient in a distal region located further from a squeezing portion of the fastener is less than a proximal static friction coefficient in a proximal region closer to the squeezing portion.
Abstract: In a control device for a steering mechanism, the steering mechanism includes a motor that includes a plurality of coils. The plurality of coils include a first coil and a second coil. The control device includes a first control system and a second control system configured to compute a command value for torque of the motor to be applied to the steering mechanism. The first control system and the second control system are each configured to control power supply to the plurality of coils of the motor based on the command value. The first control system includes a first microcomputer that has first characteristics, and the second control system includes a second microcomputer that has second characteristics that are different from the first characteristics.
Abstract: A method of manufacturing a constituent member of a constant-velocity joint includes: performing plastic working; and performing hardening of a material. The plastic working is performed with a material of the constituent member heated to a predetermined working temperature range. The hardening of the material is performed by utilizing heat applied for heating to the working temperature range in performing the plastic working as heat for the hardening of the material and cooling the material after performing the plastic working.
Abstract: A gear cutting tool configured to machine a workpiece with a skiving so as to generate a gear tooth includes a ring-shaped tool main body, and a plurality of tool blades which are replaceable and attached to the tool main body, such that the tool blades are arranged in a circumferential direction of the tool main body and a blade tip of each of the tool blades is oriented inward in a radial direction of the tool main body. Since the gear cutting tool for skiving is an internal gear type tool, the accuracy and the tool life of external gear machining when using the internal gear type tool are higher and longer than the accuracy and the tool life of external gear machining when using an external gear type tool. As a result, the frequency of replacement of the tool blades can be lowered and cost can be reduced.
Abstract: An assist device includes body gear, an actuator unit, an angle detector, a torque detector, a load detector, and a controller. The angle detector is configured to detect a forward leaning angle of the hips of a person relative to his or her thighs. The torque detector is configured to detect a torque-related amount related with a torque based on the forward leaning angle. The load detector is configured to detect a load-related amount based on either a baggage mass or a baggage weight. The controller is configured to calculate the assisting torque based on the torque-related amount and the load-related amount. The controller is configured to control the actuator unit based on the assisting torque.
Abstract: A rack-parallel steering system that prevents entry of abrasion powder into a rolling bearing is provided. A steering system includes a steered shaft, a rolling element screw portion, a rolling element nut, and a ball screw device. The steering system includes: a motor including an output shaft offset from the steered shaft; a drive force transfer mechanism including a toothed drive pulley, a toothed driven pulley, and a toothed belt; and a rolling bearing supporting a ball screw nut to be rotatable relative to a housing. A first seal member that contacts an outer ring and an inner ring is provided on a side surface of the rolling bearing on the driven pulley side. A second seal member that does not contact the inner ring is provided on a side surface of the ball bearing on the side opposite to the side surface on the driven pulley side.