A ball screw having a threaded stem including a ball groove formed in an outer surface thereof, a ball nut including a central bore formed by an inner surface thereof, the inner surface defining a ball groove, a first recess extending inwardly from an end face of the ball nut and into the ball groove of the inner surface, and a stop pin disposed in the first recess so that a first end of the stop pin extends inwardly into the ball groove of the inner surface of the ball nut, wherein the stop pin is formed by a coiled strip of metal.

A turning device includes a turning shaft having a first ball screw groove as one of a left screw and a right screw and a second ball screw groove as the other of the left screw and the right screw and turning wheels to be turned by moving in an axial direction, a first electric motor generating a first driving force, a second electric motor operating independently of the first electric motor and generating a second driving force, a first ball screw nut transmitting the first driving force generated by the first electric motor to the first ball screw groove, a second ball screw nut transmitting the second driving force generated by the second electric motor to the second ball screw groove, and a rotation regulating part regulating relative rotation of the turning shaft around an axis with respect to a housing.

A ball screw device includes a screw shaft that has a first helical groove on an outer circumference, a nut that has a second helical groove on an inner circumference, a plurality of balls, a stopper provided at an end portion of the second helical groove, and a spring body that is placed between an end portion ball closest to the stopper and the stopper. The spring body is configured of a plurality of coil springs arrayed along the first helical groove and the second helical groove. The coil springs that are adjacent each have a spring end portion of which rigidity is higher than rigidity of a spring middle portion.

An application, in particular for motor vehicle closing devices. The basic design of the motor vehicle has an electric motor and an actuating element which is acted upon by the electric motor directly or indirectly via a powertrain. The powertrain is provided with at least one Evoloid toothing. According to the invention, a drive shaft of the electric motor is equipped with an Evoloid pinion which meshes with an Evoloid output gear at the input of the powertrain, thereby directly producing the Evoloid toothing.

Provided is an electric actuator, including: a driving motor (2); a motion conversion mechanism (6) configured to convert a rotary motion of the driving motor (2) to a linear motion; a transmission gear mechanism (5) configured to transmit a driving force from the driving motor (2) to the motion conversion mechanism (6); and a speed reduction mechanism (3) configured to reduce a speed of the rotary motion of the driving motor (2), and output the rotary motion reduced in speed to the transmission gear mechanism (5), wherein a side of one end portion of a rotation shaft (18) of a gear (16) of the transmission gear mechanism (5) is rotatably supported by a bearing (19), and a side of another end portion of the rotation shaft (18) of the gear (16) is rotatably supported by the output shaft (2a) of the driving motor (2).

The present invention provides a rack assist type electric power steering apparatus. The power steering apparatus includes: a ball nut coupled to a rack bar via balls to be rotated, and configured to cause the rack bar to slide; a bearing mounted on an outer peripheral surface of the ball nut so as to support rotation of the ball nut; and a support member coupled to at least one of a space between one side of an outer race of the bearing and a housing and a space between the other side of the outer race of the bearing and the housing so as to support the bearing.

A steering device of the present invention has a steered shaft rotation stopper (100) having a contact member (101) and a forcing member (102). The forcing member (102) forces at least either one of a steered shaft (6) or the contact member (101) in a direction in which the steered shaft (6) and the contact member (101) push against each other. In a state in which the contact member (101) contacts a contact portion (6D) of the steered shaft (6), the contact member (101) stops a rotation of the steered shaft (6).

A continuously variable transmission (“CVT”) is provided for use on a recreational or utility vehicle. The CVT is electronically controlled by a control unit of the vehicle. The CVT includes a primary clutch having a first sheave, a second sheave movable relative to the first sheave, and a friction clutch. An actuator assembly is configured to actuate the primary clutch and cause movement of the second sheave.

A ball screw nut includes a nut part and a pulley part integrally molded with the nut part on the outer peripheral side of the nut part and having external teeth. The pulley part has a cylindrical portion extending in an axial direction and facing the nut part in a radial direction, and an extended portion extending radially inward from the cylindrical portion and facing the nut part in the axial direction. A restriction part for restricting relative rotation of the nut part and the pulley part is provided between a facing surface of the extended portion facing the nut part and a facing surface of the nut part facing the extended portion.

The invention relates to a disc brake, comprising a brake carrier, a brake caliper, brake shoes, and an actuating piston. The brake carrier has at least one mounting point for mounting on a vehicle. The actuating piston is displaceably accommodated on the brake caliper and is actuatable for carrying out a service brake function of the disc brake. At least one further actuating piston is provided, which in the direction of its longitudinal axis is displaceably accommodated on the brake caliper. For carrying out the service brake function, the at least two actuating pistons are actuatable, and for carrying out a parking brake function, one of the actuating pistons is actuatable. The invention further relates to a disc brake system and a parking brake system.