A method for assembling a rack-and-pinion steering gear may involve introducing a steering pinion into a housing opening of a steering gear housing such that a region of a narrowed portion of a pinion shaft is situated at a level of a rack to be inserted, introducing the rack into the housing opening of the steering gear housing such that the rack is pushed past the narrowed portion of the pinion shaft into a setpoint position, and moving the pinion shaft farther into the steering gear housing to an end position such that a toothing region of the rack enters into engagement with a toothing of the steering pinion.

A rack and pinion steering system for a motor vehicle may include a pinion shaft that is connected to a steering shaft and has a steering pinion that is engaged with a rack mounted in a steering gear housing such that the rack can be displaced along a longitudinal axis for pivoting steerable wheels. The steering shaft, the pinion shaft with the steering pinion, and the step-down gear mechanism may be received in the steering gear housing. The rack and pinion steering system may further include an electric motor that drives the pinion shaft via a step-down gear mechanism. The step-down gear mechanism may be arranged at an end of the pinion shaft that is remote from the steering shaft.

A shaft coupling includes a first coupling member, a second coupling member, and a cushioning member. The first coupling member includes first protrusions. The second coupling member includes second protrusions. The cushioning member includes a plurality of radiating portions. When the first coupling member and the second coupling member are arranged coaxially and the first coupling member and the second coupling member are in an unloaded state, predetermined paired facing surfaces have a minimum clearance angle present on a radially outer side with respect to a center of the radiating portion in a radiating direction. The predetermined paired facing surfaces are at least one of first paired facing surfaces and second paired facing surfaces.

According to electric power steering apparatuses of these embodiments, power of a motor is secondarily reduced and a torque is amplified by connecting a worm wheel and a steering shaft using a cycloid gear, a weight and a cost of the motor can be reduced, and various reduction ratios can be realized, and a secondary deduction structure can be realized while minimizing a change in the structure of an existing reducer.

A steer-by-wire steering device includes a first member, a second member, and a stopper. The first member includes a first base surrounding an input shaft and rotatable, a first protrusion protruding from the first base in a radial direction or in an axial direction, and a first weight provided on the first base so as to make a weighted center consistent with a center of the input shaft. The second member is rotatable together with the first member with the first protrusion being abutting the second protrusion. The stopper is provided on a trajectory of the second protrusion, and is capable of restricting the turn of a steering wheel via the input shaft when abutting with the second protrusion.

A steering system for a road vehicle; the steering system comprises: a steering wheel provided with an outer ring, which is mounted so as to rotate around a rotation axis and has no mechanical connection to steering wheels; a support element, which, on one side, can be rigidly fixed on the inside of the vehicle and, on the other side, is connected to the steering wheel so as to support the steering wheel; and a position sensor, which is designed to detect the angular position of the outer ring of the steering wheel around the rotation axis. The support element is telescopic so as to vary its axial size along the rotation axis in order to change the axial position of the steering wheel.

Technical solutions are described for controlling operation of an electric machine such as a permanent magnet synchronous motor (PMSM) drive or motor control system to limit battery current and protect a battery from excessive discharging or charging current from the PMSM drive. Systems and methods employ a torque control algorithm for PMSMs that uses a battery current limit constraint when generating current commands during each of a maximum torque per ampere (MTPA) operation, and maximum torque per voltage (MTPV) operation. Torque search operations are performed in each of the MTPA and MTPV operation regions in a PMSM drive system until current commands are achieved under a given battery current limit constraint and while maintaining maximum voltage utilization throughout all PMSM operation regions.

Provided is a torque transmission joint that is able to suppress occurrence of noise when reversing the direction of rotation of the drive shaft. The first transmission member 17 fixed to the output shaft 12a which is a drive shaft is engaged with the first elastic member 20 in a state where the first gap in the circumferential direction is interposed, as well as with the intermediate transmission member 19 in a state where a gap in the circumferential direction which is larger than the first gap is interposed. The second transmission member 18 fixed to an end portion of the worm 8 is engaged with the second elastic member 21 in a state where the second gap in the circumferential direction is interposed, as well as with the intermediate transmission member 19 in a state where a gap in the circumferential direction which is larger than the second gap. The first annular convex portion 54 is pressure fitted to the first annular concave portion 38, and the second annular convex portion 60 is pressure fitted to the second annular concave portion 45 so as to prevent separation of the first, second elastic members 20, 21 with respect to the intermediate transmission member 19.

An electric power steering system includes: a steering bar, an electric motor, a linear position sensor, and a sensing means. The steering bar is mechanically connected at each opposing end to a respective wheel carrier. The linear position sensor having one elongate feature that extends diagonally along a length of the steering bar such that it is inclined relative to the axis of the steering bar. The sensing means faces the steering bar and at any given time observes only a slice of the elongate feature that extends across the full width of the feature and along only a part of the length of the feature. The sensing means generates a signal that varies depending on the pattern formed by the feature and adjacent portions of the steering bar that is observed by the sensing means.

A power steering system includes a steering shaft, a linkage assembly, a first power assist assembly, and a second power assist assembly. The linkage assembly includes an input member drivingly connected to the steering shaft and an output member adapted to be drivingly connected to steerable wheels. The first power assist assembly is drivingly connected to the steering shaft and is arranged to apply a torque to the steering shaft to supplement a driver input force and change the direction of the steerable wheels. The second power assist assembly includes an electric motor drivingly connected to one of the steering shaft and the linkage assembly. The electric motor is arranged to apply torque to the steering shaft or the linkage assembly to change the direction of the steerable wheels with or without a presence of the driver input force to the steering shaft.