Provided is a steering control device and a steering control method that can suppress the deterioration of the turning responsiveness at the initial stage of steering that may occur in a four-wheel steering vehicle and improve the steering stability when the front and rear wheels of the four-wheel steering vehicle are controlled in the same phase. A steering control device 1 of a vehicle that controls a rear wheel steering angle based on a front wheel steering angle includes a control unit 19 that controls an amount obtained by dividing an integrated value of a change in the rear wheel steering angle in a second steering section where an absolute value of the front wheel steering angle is constant and/or decreases by a time to be larger than an amount obtained by dividing an integrated value of a change in the rear wheel steering angle in a first steering section where the absolute value of the front wheel steering angle increases by a time.

A subframe for a rear axle of a motor vehicle includes a transverse structure and a steering device for wheels of the motor vehicle which are fastened to the rear axle. In the installed state of the subframe in the motor vehicle, the transverse structure extends in the transverse direction of the motor vehicle. The transverse structure includes an upper transverse structure element and a lower transverse structure element. The steering device is arranged between the upper transverse structure element and the lower transverse structure element.

A subframe for a rear axle of a motor vehicle includes a transverse structure and a steering device for wheels of the motor vehicle which are fastened to the rear axle. In the installed state of the subframe in the motor vehicle, the transverse structure extends in the transverse direction of the motor vehicle. The transverse structure includes an upper transverse structure element and a lower transverse structure element. The steering device is arranged between the upper transverse structure element and the lower transverse structure element.

An electronic power steering system includes: an input shaft connected to a steering shaft; an output shaft to which one end of the input shaft is connected; and a torsion bar inserted into the input shaft and the output shaft and connecting the input shaft and the output shaft, in which the torsion bar includes a first torsion bar including a first fastening portion connected to the input shaft, a second fastening portion connected to the output shaft, and a first beam portion connecting between the first fastening portion and the second fastening portion, and formed as a hollow body, and a second torsion bar including a third fastening portion coupled into the first fastening portion, a fourth fastening portion coupled into the second fastening portion, and a second beam portion connecting between the third fastening portion and the fourth fastening portion.

An electronic power steering system includes: an input shaft connected to a steering shaft; an output shaft to which one end of the input shaft is connected; and a torsion bar inserted into the input shaft and the output shaft and connecting the input shaft and the output shaft, in which the torsion bar includes a first torsion bar including a first fastening portion connected to the input shaft, a second fastening portion connected to the output shaft, and a first beam portion connecting between the first fastening portion and the second fastening portion, and formed as a hollow body, and a second torsion bar including a third fastening portion coupled into the first fastening portion, a fourth fastening portion coupled into the second fastening portion, and a second beam portion connecting between the third fastening portion and the fourth fastening portion.

A tilting vehicle having a steering system actively steering a front axle and a rear axle having two wheels that can be deflected individually in a vertical manner with respect to a vehicle body and that are independent of the steering system. The wheels of the rear axle can be steered by passive steering device configured to generate a steering force because of a vertical deflection of the wheels as the vehicle body tilts to one side. The steering force causing wheels to steer towards the opposite side.

A vehicle steering system has a pitman arm being pivotable about a pitman arm pivot axis in response to pivoting of a steering column, a link pivotally connected to the pitman arm, an idler arm pivotally connected to the link and being pivotable about an idler arm pivot axis, the link extending between the pitman arm and the idler arm, a first tie rod pivotally connected to the pitman arm and extending from the pitman arm in a first direction, and a second tie rod pivotally connected to the idler arm and extending from the idler arm in a second direction, the second direction being opposite the first direction. A vehicle having the vehicle steering system is also described.

A method for detecting a steering engagement by a driver in a vehicle without a steering wheel sensor system, in which at least one steering sensor associated with a steering system of the vehicle, which sensor is associated either with the steering wheel or with a steering linkage of the vehicle, is used to capture a first application of force into the steering system of the vehicle, in which at least one chassis sensor associated with at least one chassis component of the vehicle is used to capture a second application of force onto the at least one chassis component.

A method for detecting a steering engagement by a driver in a vehicle without a steering wheel sensor system, in which at least one steering sensor associated with a steering system of the vehicle, which sensor is associated either with the steering wheel or with a steering linkage of the vehicle, is used to capture a first application of force into the steering system of the vehicle, in which at least one chassis sensor associated with at least one chassis component of the vehicle is used to capture a second application of force onto the at least one chassis component.

A vehicle steering system includes a steering operation mechanism configured to steer a steered wheel, and a steering operation motor configured to apply a drive force for steering the steered wheel to the steering operation mechanism. The steering operation mechanism includes an input shaft to which the drive force from the steering operation motor is input, an output shaft configured to output the drive force from the input shaft to the steered wheel, and a coupling mechanism configured to couple the input shaft and the output shaft to each other. The coupling mechanism includes a first universal joint and a second universal joint that transmit the drive force from the input shaft to the output shaft in a state in which the output shaft is angularly offset from the input shaft. The output shaft constitutes a part of a suspension.