Jtekt Corporation

Toyota Jidosha Kabushiki Kaisha

Fumio Kishida

Yoshio Kondo

Toshiaki Ogata

Keishi Nakamura

Hiroshi Kawakami

Hirohide Suzuki

Atsushi Watanabe

Harunori Shiratori

Koichi Sugihara

Eiji Tanaka

Susumu Imagaki

A steering device includes two motors each configured to generate a drive force that steers a steerable wheel of a vehicle and two controllers respectively corresponding to the two motors, each of the two controllers being configured to individually control a corresponding one of the motors. One of the two controllers is a first controller, and the other one of the two controllers is a second controller. The first controller is configured to calculate a command value corresponding to a total torque that should be generated in the two motors. The command value is divided into individual command values using a changeable distribution ratio set for each of the motors, the individual command values respectively corresponding to the motors. The two controllers are configured to respectively supply the motors with current corresponding to the individual command values.

Steering device and steering method

A steering device includes a steering rod that includes two ball screw parts, the steering rod being configured to steer a steerable wheel by moving linearly, two ball nuts respectively fastened to the two ball screw parts, two motors each configured to generate a drive force, two transmission mechanisms each including a toothed belt, the two transmission mechanisms being configured to transmit the drive force of each one of the two motors to a corresponding one of the ball nuts, two detectors configured to respectively detect rotation angles of the two motors, and a controller configured to control each of the two motors. The controller is configured to detect tooth jumping of the belts using the rotation angles of the two motors that are detected by the two detectors.

Steering device and method for detecting anomaly in steering device

A turning apparatus includes tie rods, a wheel turning shaft, two motors, two ball screws, a transmission mechanism, and two controllers. The wheel turning shaft turns steered wheels of a vehicle. A first controller that is any one of the two controllers computes a current command value and allocates the current command value to the motors at a ratio that varies with a position of the wheel turning shaft in an axial direction. The two controllers each supply any one of the motors, which is an object to be controlled by a corresponding one of the controllers, with a current according to a corresponding of individual current command values.

Turning apparatus

A steering system includes a housing, a steering operation shaft that is housed in the housing and configured to move in an axial direction to steer right and left steered wheels, a first drive source that generates a first drive force, a second drive source that generates a second drive force, a first power transfer unit that applies an axial force to the steering operation shaft with the first drive source, a second power transfer unit that applies an axial force to the steering operation shaft with the second drive force, a position detection sensor that is provided in the housing and detects an axial position of the steering operation shaft, and a control device that controls the first drive source and the second drive source using a detection result of the position detection sensor.

Steering system

A turning device includes a turning shaft having a first ball screw groove as one of a left screw and a right screw and a second ball screw groove as the other of the left screw and the right screw and turning wheels to be turned by moving in an axial direction, a first electric motor generating a first driving force, a second electric motor operating independently of the first electric motor and generating a second driving force, a first ball screw nut transmitting the first driving force generated by the first electric motor to the first ball screw groove, a second ball screw nut transmitting the second driving force generated by the second electric motor to the second ball screw groove, and a rotation regulating part regulating relative rotation of the turning shaft around an axis with respect to a housing.

Turning device

Elongated holes are formed in a first plate of a fixed bracket so as to extend parallel to a column moving direction. An elongated hole inserted portion of a suspending bolt of a suspending mechanism is disposed in an initial assembling position in one of the elongated holes. An inner circumference of the elongated hole includes a pair of flat surface portions which are parallel to the column moving direction, an arc-shaped surface portion and tapered surface portions which connect a pair of end portions of the arc-shaped surface portion to the corresponding flat surface portion. Tapered angles which the tapered surfaces form relative to the column moving direction are equal to or greater than a friction angle.

Steering device

A power-assisted steering system includes a changeover valve unit comprising an input shaft to be rotated by the driver's steering effort applied thereto, an output shaft operatively connected to a hydraulic power cylinder associated with the steering system, a valve assembly for controlling the supply of fluid under pressure from a hydraulic pump to the power cylinder in response to relative rotation between the input and output shafts; and a hydraulic reaction mechanism for applying a reaction force to the input shaft in accordance with a hydraulic reaction pressure applied thereto. The reaction mechanism includes a reaction fluid chamber to be constantly applied with a predetermined small quantity of fluid under pressure and to be applied with a hydraulic pressure caused by relative rotation between the input and output shafts through a throttle. The system is arranged to increase the hydraulic pressure in the reaction fluid chamber in accordance with an increase of travel speed of the vehicle.

Growing community of inventors

Toyota, Japan

Fumio Kishida