Steering actuator apparatus for vehicle
A steering actuator apparatus for a vehicle, may include: a housing, a drive part supported by the housing and configured to generate a rotational force, a transmission shaft part installed to be movable in the housing and configured to change a steering angle of a wheel while reciprocating by receiving the rotational force from the drive part, a measurement part configured to measure the steering angle of the wheel while operating in conjunction with a movement of the transmission shaft part, and a rotation prevention part disposed between the housing and the transmission shaft part and configured to prevent a relative rotation between the housing and the transmission shaft part.
1 . A steering actuator apparatus for a vehicle, comprising:
a housing;
a drive part supported by the housing and configured to generate a rotational force;
a transmission shaft part installed to be movable in the housing and configured to change a steering angle of a wheel by receiving the rotational force from the drive part;
a measurement part configured to measure the steering angle of the wheel while operating in conjunction with a movement of the transmission shaft part; and
a rotation prevention part disposed between the housing and the transmission shaft part and configured to prevent a rotation between the housing and the transmission shaft part, wherein the rotation prevention part comprises:
a body portion disposed between the housing and the transmission shaft part;
a first rotation prevention member protruding from an outer peripheral surface of the body portion and configured to be inserted into a first insertion portion recessed in the housing; and
a second rotation prevention member protruding from an inner peripheral surface of the body portion and configured to be inserted into a second insertion portion recessed in the transmission shaft part.
2 . The steering actuator apparatus of claim 1 , wherein the transmission shaft part comprises:
a ball screw configured to convert the rotational force generated from the drive part into a rectilinear motion; and
a rack bar extending from the ball screw and configured to engage with the measurement part.
3 . The steering actuator apparatus of claim 2 , wherein the drive part comprises:
a power generation unit configured to generate the rotational force;
a control unit connected to the power generation unit and configured to control an operation of the power generation unit; and
a power transmission unit configured to transmit the rotational force generated from the power generation unit to the transmission shaft part.
4 . The steering actuator apparatus of claim 3 , wherein the power transmission unit comprises:
a speed reducer connected to the power generation unit and configured to amplify the rotational force generated from the power generation unit; and
a ball nut coupled to the ball screw and configured to move the transmission shaft part by receiving the rotational force from the speed reducer.
5 . The steering actuator apparatus of claim 2 , wherein the measurement part comprises:
a pinion configured to engage the rack bar and rotate in conjunction with a movement of the rack bar; and
a sensor unit coupled to the housing and configured to measure a rotation angle and a rotation direction of the pinion.
6 . The steering actuator apparatus of claim 5 , wherein the pinion comprises a spur gear.
7 . The steering actuator apparatus of claim 5 , wherein the pinion is insert injection molded.
8 . The steering actuator apparatus of claim 1 , wherein the first rotation prevention member and the second rotation prevention member are disposed on a circumference of the body portion and provided at opposite sides of a center of the body portion along a diameter of the body portion.
9 . The steering actuator apparatus of claim 1 , wherein the second rotation prevention member comprises a pair of second rotation prevention members configured to be spaced apart from each other at a preset interval in a circumferential direction of the body portion.
10 . The steering actuator apparatus of claim 9 , wherein the preset interval is 180 degrees or less.
11 . The steering actuator apparatus of claim 1 , further comprising:
a movement prevention part disposed in the housing and configured to support the transmission shaft part.
12 . The steering actuator apparatus of claim 11 , wherein the movement prevention part comprises:
a first movement prevention member having:
an outer peripheral surface press-fit with an inner peripheral surface of the housing, and
an inner peripheral surface adjoining the transmission shaft part; and
a second movement prevention member having:
an outer peripheral surface press-fit with an inner peripheral surface of the rotation prevention part, and
an inner peripheral surface adjoining the transmission shaft part.
13 . A steering actuator apparatus for a vehicle, comprising:
a housing;
a drive part supported by the housing and configured to generate a rotational force;
a transmission shaft part installed to be movable in the housing and configured to change a steering angle of a wheel by receiving the rotational force from the drive part;
a measurement part configured to measure the steering angle of the wheel while operating in conjunction with a movement of the transmission shaft part;
a rotation prevention part disposed between the housing and the transmission shaft part and configured to prevent a rotation between the housing and the transmission shaft part;
a movement prevention part disposed in the housing and configured to support the transmission shaft part, wherein the movement prevention part comprises:
a first movement prevention member having:
an outer peripheral surface press-fit with an inner peripheral surface of the housing, and
an inner peripheral surface adjoining the transmission shaft part; and
a second movement prevention member having:
an outer peripheral surface press-fit with an inner peripheral surface of the rotation prevention part, and
an inner peripheral surface adjoining the transmission shaft part.