A vehicle steering system comprises: a motor assembly operably coupled to a steering rack, the motor assembly comprising a motor having a rotor and a motor position sensor configured to sense a rotor angle of the motor in a single-turn range; and a rotary-to-linear conversion mechanism operably coupled between the motor assembly and the steering rack, the rotary-to-linear conversion mechanism comprising a rotor operably coupled to the rotor of the motor. A processor calculates an absolute angular position of the pinion in a full-turn range of rotation of the pinion based on the sensed rotor angle of the motor and a pinion angle sensed by a pinion angle sensor in a single-turn range, or based on the sensed rotor angle of the motor and an angle of the rotor of the rotary-to-linear conversion mechanism sensed by an angular position sensor in the single-turn range.

An electromechanical actuator package for actuating a brake assembly configured to operate a vehicle brake comprises: a motor; a differential operably connected to the motor, the differential comprising a pulley and an output connectable to the brake assembly; and a locking mechanism configured to lock the pulley of the differential, the locking mechanism comprising: a base configured to be movable, a plurality of projections projecting from the movable base, the projections comprising first and second projections, wherein at least a part of the pulley is positioned between the first and second projections projected from the movable base, an electromagnet assembly disposed adjacent to at least one of the projections, the electromagnet assembly operably associated with at least one of the projections, and one or more springs operably coupled to the movable base and/or at least one of the projections.

An electric motor with a rotor and a stator, where the rotor and/or the stator can comprise two or more sections, and a torque ripple caused by the magnetic field(s) associated with a section of the rotor (or stator) can at least partially counters torque ripple caused by the magnetic field(s) associated with other section(s) of the rotor (or stator).

A brake pad 10 can brake a rotation of a disc 200. The brake pad 10 includes a friction material 12 provided on the side of the disc 200 and a back plate 11 bonded to the friction material 12 on the opposite side of the disc 200. A thickness of a central region of the back plate 11 in a rotational direction of the disc 200 is larger than thicknesses of both end regions of the back plate 11 in the rotational direction of the disc. In the case where a minimum value of the thicknesses of the end regions of the back plate 11 is defined as h.sub.1 [mm] and a maximum value of the thickness of the central region of the back plate 11 is defined as h.sub.2 [mm], h.sub.1 and h.sub.2 preferably satisfy a relationship of h.sub.2h.sub.1<3.

A brake pad 10 can brake a rotation of a disc 200. The brake pad 10 includes a friction material 12 provided on the side of the disc 200 and a back plate 11 bonded to the friction material 12 on the opposite side of the disc 200. A thickness of a central region of the back plate 11 in a rotational direction of the disc 200 is larger than thicknesses of both end regions of the back plate 11 in the rotational direction of the disc. In the case where a minimum value of the thicknesses of the end regions of the back plate 11 is defined as h.sub.1 [mm] and a maximum value of the thickness of the central region of the back plate 11 is defined as h.sub.2 [mm], h.sub.1 and h.sub.2 preferably satisfy a relationship of h.sub.2h.sub.1<3.

A friction brake device has a brake rotor that rotates around an axis of rotation, brake pads that can rotate around an axis of autorotation parallel to the axis of rotation, support members that support the brake pads respectively, and pressing devices that press the brake pads against the brake rotor respectively. In the friction brake device, when the brake pads are pressed against the brake rotor, the brake pads revolve around the axis of rotation relatively to the brake rotor while being frictionally engaged with lateral faces of the brake rotor respectively. The support members press the brake pads in a direction perpendicular to the axis of rotation, and frictionally engage outer peripheries of the brake pads with a cylindrical face of the brake rotor respectively. The brake pads auto-rotate around the axis of autorotation upon beginning to be pressed, but come to rest when the pressing force increases.

A friction brake device has a brake rotor that rotates around an axis of rotation, brake pads that can rotate around an axis of autorotation parallel to the axis of rotation, support members that support the brake pads respectively, and pressing devices that press the brake pads against the brake rotor respectively. In the friction brake device, when the brake pads are pressed against the brake rotor, the brake pads revolve around the axis of rotation relatively to the brake rotor while being frictionally engaged with lateral faces of the brake rotor respectively. The support members press the brake pads in a direction perpendicular to the axis of rotation, and frictionally engage outer peripheries of the brake pads with a cylindrical face of the brake rotor respectively. The brake pads auto-rotate around the axis of autorotation upon beginning to be pressed, but come to rest when the pressing force increases.

A no-back brake system for an actuator includes a ball ramp mechanism. A drag brake assembly is configured to be coupled to a first portion of the ball ramp mechanism. A main brake assembly is configured to be coupled to an actuator and a second portion of the ball ramp mechanism. A limited authority damper assembly is disposed between the drag brake assembly and the main brake assembly. The limited authority damper assembly includes an outer spacing ring configured to be coupled to the drive shaft of the actuator, an inner damping ring coupled to the outer spacing ring and the drag brake assembly, and a first spring disposed between the outer spacing ring and the inner damping ring.

A no-back brake system for an actuator includes a ball ramp mechanism. A drag brake assembly is configured to be coupled to a first portion of the ball ramp mechanism. A main brake assembly is configured to be coupled to an actuator and a second portion of the ball ramp mechanism. A limited authority damper assembly is disposed between the drag brake assembly and the main brake assembly. The limited authority damper assembly includes an outer spacing ring configured to be coupled to the drive shaft of the actuator, an inner damping ring coupled to the outer spacing ring and the drag brake assembly, and a first spring disposed between the outer spacing ring and the inner damping ring.