A self-setting valve assembly includes a plug, a first plunger assembly, a second plunger assembly, and a biasing member. The plug has a first portion and a second portion. The first plunger assembly is movably disposed within the first portion. The second plunger assembly is movably disposed within the second portion. The biasing member is disposed between the first plunger assembly and the second plunger assembly. The biasing member is configured to bias each of the first plunger assembly and the second plunger assembly towards a closed position.

A shaft arrangement for a steering gear has an input shaft, an output shaft and a torsion rod. The torsion rod is connected in a rotationally secure manner to the input shaft in an input-side connection region of the shaft arrangement. The torsion rod is connected in a rotationally secure manner to the output shaft in an output-side connection region of the shaft arrangement. The input-side connection region is spaced apart from the output-side connection region. The shaft arrangement has a rotation prevention member, wherein the rotation prevention member limits a rotation of the input shaft relative to the output shaft to a maximum rotation angle and, when the maximum rotation angle is reached, can transmit a torque from the input shaft to the output shaft.

A shaft arrangement for a steering gear has an input shaft, an output shaft and a torsion rod. The torsion rod is connected in a rotationally secure manner to the input shaft in an input-side connection region of the shaft arrangement. The torsion rod is connected in a rotationally secure manner to the output shaft in an output-side connection region of the shaft arrangement. The input-side connection region is spaced apart from the output-side connection region. The shaft arrangement has a rotation prevention member, wherein the rotation prevention member limits a rotation of the input shaft relative to the output shaft to a maximum rotation angle and, when the maximum rotation angle is reached, can transmit a torque from the input shaft to the output shaft.

A steering assistance device includes an input shaft, a torque sensor, and output shaft, a gear unit, a steering housing, and a drive unit. The drive unit and the torque sensor are arranged so as to be in mechanical contact with the steering housing. The drive unit has a pump for conveying the working medium and a motor for driving the pump. The drive unit has a reservoir for containing working medium, wherein at least the pump is arranged within the reservoir. The input shaft, the torque sensor, the gear unit, and the drive unit are arranged in a row along a longitudinal axis.

A steering assistance device includes an input shaft, a torque sensor, and output shaft, a gear unit, a steering housing, and a drive unit. The drive unit and the torque sensor are arranged so as to be in mechanical contact with the steering housing. The drive unit has a pump for conveying the working medium and a motor for driving the pump. The drive unit has a reservoir for containing working medium, wherein at least the pump is arranged within the reservoir. The input shaft, the torque sensor, the gear unit, and the drive unit are arranged in a row along a longitudinal axis.

Technical solutions for compensating for lash in a steering system are described. An example method includes determining a rack pressure value based on a driver torque value and a differential pressure across a rack of the steering system. The method also includes determining a compensation friction value based on a position of a handwheel of the steering system and a speed of a vehicle equipped with the steering system. The method also includes computing a pressure value based on the rack pressure value and the compensation friction value. The method also includes generating a torque command using the pressure value, the torque command being added to the driver assist torque for the steering system.

Technical solutions for compensating for lash in a steering system are described. An example method includes determining a rack pressure value based on a driver torque value and a differential pressure across a rack of the steering system. The method also includes determining a compensation friction value based on a position of a handwheel of the steering system and a speed of a vehicle equipped with the steering system. The method also includes computing a pressure value based on the rack pressure value and the compensation friction value. The method also includes generating a torque command using the pressure value, the torque command being added to the driver assist torque for the steering system.

A hydraulically assisted steering system comprises a steering gear operatively connected to a steering wheel and to a set of steerable wheels to effect turning of the steerable wheels in response to rotation of the steering wheel. A hydraulic motor is operatively connected to the set of steerable wheels to assist in turning of the steerable wheels. A pump is fluidly connected to the hydraulic motor to deliver a flow of fluid to the hydraulic motor via a flow path from the hydraulic pump to the hydraulic motor. The flow path from the hydraulic pump to the hydraulic motor is free of any rotary steering control valve. Pressure control apparatus monitors and adjusts hydraulic fluid pressure in the hydraulic motor. The pressure control apparatus adjusts hydraulic fluid pressure in the hydraulic motor by controlling one of pump speed and pump displacement. Direction control apparatus controls direction of hydraulic fluid flow to the hydraulic motor.

A steering shaft 10 is constructed by an input shaft 11, an intermediate shaft 13 connected to the input shaft 11 through a first torsion bar 12 and an output shaft 15 connected to the intermediate shaft 13 through a second torsion bar 14, and around the input shaft 11, there is provided a first resolver 51 for detecting a rotation angle of the input shaft 11 and around the intermediate shaft 13, there is provided a second resolver 52 for detecting a rotation angle of the intermediate shaft 13, and the first and second resolvers 51 and 52 are arranged to constitute a torque sensor TS that detects a steering torque.

In a steering device (PS1) according to the present embodiment, a preload applying mechanism (6) provides a rotation torque to one side in a rotation direction of a ball nut (4) by a reaction force generated by elastic abutment of a plunger (61) on a tooth tip of a first sector tooth (321) of a sector gear (32). Therefore, in the steering device (PS1), unlike conventional steering device, there is no need to provide a pressed portion to be pressed by the plunger (61) separately from the sector gear (32). Increase in size of a sector shaft (3) due to formation of the pressed portion can therefore be suppressed.