A turning apparatus includes tie rods, a wheel turning shaft, two motors, two ball screws, a transmission mechanism, and two controllers. The wheel turning shaft turns steered wheels of a vehicle. A first controller that is any one of the two controllers computes a current command value and allocates the current command value to the motors at a ratio that varies with a position of the wheel turning shaft in an axial direction. The two controllers each supply any one of the motors, which is an object to be controlled by a corresponding one of the controllers, with a current according to a corresponding of individual current command values.

A spring steel-made clip (22) has an arc-shaped first inserting part forcing portion (66) and an arc-shaped second inserting part forcing portion (67) facing the first inserting part forcing portion (66), a first axial direction connecting portion (68) connecting one ends of the inserting part forcing portions (66, 67) and a second axial direction connecting portion (69) connecting the other ends of the inserting part forcing portions (66, 67). The axial direction connecting portions (68, 69) have connecting end position stoppers (75, 76) protruding from their inner edge portions (68a, 69a) toward an opening (65). The connecting end position stoppers (75, 76) elastically contact position stopper contact portions (44e, 57e) of tubes (20A, 20B), then a relative movement of the tubes (20A, 20B) in a direction in which connecting end contact surfaces (47, 60) separate from each other is stopped.

A planetary roller screw drive for a steering actuator includes a screw spindle and a planetary roller assembly arranged thereon. The planetary roller assembly includes a roller body, planetary rollers arranged between the screw spindle and the roller body and which mesh with the screw spindle and with the roller body. A planetary roller carrier holds the planetary rollers. A drive pulley is connected for conjoint rotation with the planetary roller carrier and is rotatably mountable on a housing via first and second radial bearings. These radial bearings include respective inner race rings that are located on the drive pulley. First and second face plates are located at axial end regions of the drive pulley, and the face plates are rotationally fixed to respective inner race rings. The face plates are also rotationally fixed to the planetary roller carrier. An assembly method is also provided.

A method for determining a rack-and-pinion position in a steering system having an electric servomotor and a rack includes determining kinematic changes in a transmission path between the servomotor and the rack. The method further includes generating an event signal when a kinematic or dynamic rotor size of the servomotor exceeds an assigned threshold value.

In a method for operating a steering system, in particular an electrically supported steering system that includes at least one first fluid sensor unit for sensing at least one ingressing first fluid and at least one second fluid sensor unit, spatially separated from the first fluid sensor unit, for sensing at least one ingressing second fluid, at least one first response behaviour is triggered in response to the sensing of the first fluid and at least one second response behaviour, which differs from the first response behaviour at least in part, is triggered in response to the sensing of the second fluid.

According to a steer-by-wire steering apparatus of the present embodiments, by means of offsetting a gap due to abrasion occurring in a rotation preventing member for preventing the rotation of a sliding bar as the sliding bar connected to wheels slide, noise is reduced, precision of a sensor for sensing the position of the sliding bar is enhanced, and sensor precision degradation due to moving or bending of the sliding bar can be prevented.

The present embodiments provide a rack-driven power assisted steering apparatus including a rack bar having an outer circumferential screw groove formed, a ball nut having an inner circumferential screw groove and a pair of first and second ball circulation holes, a nut pulley provided with a space on the inner circumferential surface spaced apart from the outer circumferential surface of the ball nut and coupled to an end of the ball nut, and a return tube disposed between the outer circumferential surface of the ball nut and the inner circumferential surface of the nut pulley.

The present invention provides a power steering apparatus capable of improving a noise/vibration characteristic derived from a pitch difference. Assuming that a belt pitch refers to a pitch between a plurality of belt tooth portions, the belt pitch in a first state refers to the belt pitch when the power steering apparatus is in an unloaded state that no electric power is supplied to an electric motor, the belt pitch in a second state refers to the belt pitch on one side pulled by a motor pulley when electric power is supplied to the electric motor, and a first pulley pitch refers to a pitch between a plurality of tooth portions of a first pulley, which is one of the motor pulley and a nut pulley that is a pulley on a smaller diameter side, a power steering apparatus satisfies Equation 1: the belt pitch in the first state<the first pulley pitch, and Equation 2: an absolute value of (the first pulley pitch−the belt pitch in the second state)<the first pulley pitch−the belt pitch in the first state.

According to the present embodiments, provided is a rack-driven power assisted steering device in which a rolling member supporting the rotation of a ball nut is provided in a double row, a ball nut assembly is coupled to a housing through an elastic member, the flow of the ball nut is absorbed to improve noise performance, and the rolling member is directly supported by the ball nut or a support member, so that the number of parts can be reduced and easy assembly is possible.

A steering controller includes processing circuitry. The processing circuitry is configured to execute an operation process for calculating a torque command value corresponding to a sum of an amount by which the steering-side operation amount is converted into the torque required for the electric motor and an amount by which the steerable wheel-side operation amount is converted into the torque required for the electric motor and operate a drive circuit of the electric motor to adjust the torque of the electric motor to the torque command value.