Hitachi Automotive Systems, Ltd.

Knorr-bremse Commercial Vehicle Systems Japan Ltd.

Knorr-bremse Steering System Japan Ltd.

Hitachi Automotive Systems Steering, Ltd.

Takuya Ishihara

Toshiro Yoda

Shogo Ishikawa

A steering apparatus includes first and second electric motors that rotate a steering shaft via speed reduction mechanisms, and the motors being disposed to face each other. The first electric motor, a first motor pulley, a second motor pulley and the second electric motor are arranged in order in a rotation axis direction. When a first system electric actuator (including a first nut and the first electric motor) and a second system electric actuator (including a second nut and the second electric motor) are provided to the common steering shaft, in a first axis direction, the first and second nuts can be arranged close to each other, reducing sizes of the peripheries of the nuts.

Steering apparatus

In a steering device of the present invention, an electric motor rotates a steering shaft through a reduction mechanism, and the reduction mechanism and a torque sensor are accommodated in an integrally-structured housing. With this, the present invention can provide a steering device that is capable of suppressing increase in size of the electric motor.

Steering device

A steering device includes: a first steering mechanism including a first ball nut steering, and a first motor actuator, the first ball nut steering including a first output shaft, a first ball screw, and a first transmitting mechanism, the first motor actuator arranged to provide a rotation force to the first output shaft, a second steering mechanism including a second ball nut steering, and a second motor actuator, the second ball nut steering including a second output shaft, a second ball screw, and a second transmitting mechanism, the second motor actuator arranged to provide a rotation force to the second output shaft, a connection member arranged to connect the first transmitting mechanism and the second transmitting mechanism so as to interlock a movement of the first transmitting mechanism and a movement of the second transmitting mechanism.

Provided is an actuator for a steering system, which can be increased in degree of freedom for design change, regardless of a configuration change of a hydraulic power steering side. The actuator for a steering system comprises a transmission mechanism configured to transmit the rotation of a steering shaft to a steered wheel, a piston disposed in the transmission mechanism, and a pair of pressure chambers configured to generate a force acting to move the piston. The actuator for a steering system is disposed between a hydraulic power steering system, which imparts a steering force to the steered wheel along with the movement of the piston, and a steering wheel. The actuator for a steering system includes an input shaft which is rotatably and axially supported by the housing and disposed in the steering wheel side; an output shaft which is rotatably and axially supported by the housing and disposed in the hydraulic power steering system; a torsion bar connecting the input shaft and the output shaft; a motor rotor disposed around the outer periphery of the output shaft within the housing and configured to rotate integrally with the output shaft; a motor stator disposed around the outer periphery of the motor rotor within the housing; and a rotation angle detecting section disposed within the housing and configured to detect the rotation angles of the input and output shafts or a relative angle of the input and output shafts.

Actuator for steering system

The present invention provides a power steering apparatus capable of realizing a reduction in an axial dimension of the apparatus. A resolver, which detects a rotational position of a motor rotor, is provided between a motor elementand a steering housingin a direction of an x axis. A bolt, which fixes a motor housingto the steering housing, is provided so as to overlap the resolverin the direction of the x axis radially outside the resolver

Power steering apparatus

A steering shaftis constructed by an input shaft, an intermediate shaftconnected to the input shaftthrough a first torsion barand an output shaftconnected to the intermediate shaftthrough a second torsion bar, and around the input shaft, there is provided a first resolverfor detecting a rotation angle of the input shaftand around the intermediate shaft, there is provided a second resolverfor detecting a rotation angle of the intermediate shaft, and the first and second resolversandare arranged to constitute a torque sensor TS that detects a steering torque.

Power steering device

A power steering device is provided with a device body and a hollow motor. The device body has a steering system in which a piston is disposed on an output shaft via a ball screw mechanism so that a steering (rotational) torque is transmitted from an input shaft to the output shaft and converted to rotation of a sector shaft by axial movement of the piston for steering of steerable wheels. The hollow motor is connected to the outer circumference of the input shaft and driven by energization control based on driving support information from a vehicle-mounted camera and the like. A key and a key groove are provided on the outer circumference of the input shaft and the inner circumference of a rotor of the hollow motor, respectively, so as to constitute a key connection between the input shaft and the hollow motor.

Growing community of inventors

Kumagaya, Japan

Takuya Ishihara