Steering actuator, electric power steering apparatus and vehicle including the same

Abstract

To provide a steering actuator capable of preventing rattling noise due to backlash, an electric power steering device, and a vehicle including the same.SOLUTION: To provide a steering actuator, an electric power steering device, and a vehicle including the same, which compensate for a gap generated by abrasion between a pinion shaft gear and an output shaft gear.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present embodiments relate to a steering actuator, an electric steering device, and a vehicle including the same, which can prevent rattle noise caused by backlash between a pinion shaft gear and an output shaft gear. [Background technology]

[0002] In general, an electric steering system for a vehicle is a system that allows a driver to change the direction of travel of the vehicle as desired. For example, when a steering wheel rotates, the rotational force is transmitted to a steering gear, which changes the angle of the wheel and changes the direction of travel of the vehicle.

[0003] Such an electric steering device may use a steering actuator as an auxiliary power tool to reduce the driver's effort. Steering actuators can be broadly classified into hydraulic steering actuators that use engine power to operate a hydraulic pump to assist steering force, and electric steering actuators that use an electric motor.

[0004] A hydraulic steering actuator has a structure that senses the rotation of the steering wheel, activates a hydraulic pump using the rotational force of the engine, and applies the hydraulic pressure to a drive unit such as a rack bar or a cylinder configured on the steering shaft to assist the driver's steering force.

[0005] The electric steering actuator has a structure that detects the rotation of the steering wheel and activates a motor that is installed on the rack or steering shaft and assists the rotational movement, thereby enabling the electric steering device to operate smoothly.

[0006] However, electric steering actuators have a structure in which a gear formed on a pinion shaft directly meshes with a gear on an output shaft, which can cause wear during operation. Also, if wear between the gears creates play, rattle noise can occur due to backlash during operation. Summary of the Invention [Problem to be solved by the invention]

[0007] The present embodiments provide a steering actuator, an electric steering device, and a vehicle including the same that can prevent rattle noise caused by backlash by compensating for the flapping caused by wear between the pinion shaft gear and the output shaft gear. [Means for solving the problem]

[0008] In one aspect of the present invention, the present embodiments include a pinion shaft connected to a steering shaft and having a first gear formed on one side thereof, and a gear shifter having a first gear on one side thereof. fit together An output shaft on which a second gear is formed, and a second gear disposed on one side of the first gear. meshing a first adjusting gear formed so as to be linearly movable along the rotation axis of the pinion shaft; and a second gear arranged to face the first adjusting gear. meshing A steering actuator for a vehicle can be provided, which includes a second adjusting gear formed so as to be linearly movable along the rotation axis of the pinion shaft, and an elastic member arranged between the first adjusting gear and the second adjusting gear.

[0009] This vehicle steering actuator includes a worm that rotates by receiving power from a drive motor, and a pinion shaft on the other side of the worm and fit together A worm wheel may further be included.

[0010] The rotation axis of the pinion shaft may be formed to protrude from one side of the first gear. A key or a key groove may be formed in the lengthwise direction on the outer circumferential surface of the protruding pinion shaft. The first adjustment gear and the second adjustment gear may be formed with a key groove into which a key is inserted or with a key to be inserted into the key groove. The first gear and the second gear may be helical gears.

[0011] The first and second adjusting gears can be formed with the same tooth shape as the first gear.

[0012] The elastic member may be a disc spring having a through hole formed in the center thereof through which the rotation axis of the pinion shaft passes.

[0013] The width of the elastic member may be smaller than the width of the first gear.

[0014] The pinion shaft may further include a fixing member fixed to one side of the pinion shaft to prevent the second adjustment gear from coming off. An anti-detachment groove into which a part of the fixing member is inserted may be formed on an outer circumferential surface of the pinion shaft.

[0015] The fixing member may be formed in the shape of an O-ring with an opening formed on one side.

[0016] The first and second adjusting gears can be linearly moved in opposite directions by the elastic member to compensate for the interference between the first and second gears.

[0017] The first adjusting gear, the second adjusting gear and the elastic member may be provided in plural.

[0018] In another aspect of the present invention, the present embodiments include a driving motor that generates power based on a control signal transmitted from a controller, a pinion shaft connected to the driving motor and having a first gear formed on one side, and a gear unit having the first gear and a gear shaft on one side. fit together An output shaft on which a second gear is formed, and a second gear disposed on one side of the first gear. meshinga first adjusting gear formed so as to be linearly movable along the rotation axis of the pinion shaft; and a second gear arranged to face the first adjusting gear. meshing An electric steering device can be provided that includes a second adjusting gear formed so as to be linearly movable along the rotation axis of the pinion shaft, and an elastic member arranged between the first adjusting gear and the second adjusting gear.

[0019] This electric steering device is provided with a worm that rotates by receiving power from a drive motor, and a pinion shaft on the other side of the worm. meshing The worm wheel may include a worm wheel.

[0020] The rotation axis of the pinion shaft may be formed to protrude from one side of the first gear. A key or a key groove may be formed in the outer circumferential surface of the protruding pinion shaft in the longitudinal direction. The first adjustment gear and the second adjustment gear may be formed with a key groove into which a key is inserted or with a key to be inserted into the key groove.

[0021] The pinion shaft may further include a fixing member fixed to one side of the pinion shaft to prevent the second adjustment gear from coming off, and an anti-detachment groove into which a part of the fixing member is inserted may be formed on an outer circumferential surface of the pinion shaft.

[0022] In another aspect of the present invention, the present embodiments include a steering angle setting unit that sets a steering angle of a vehicle based on a travel route set by a travel route setting unit, and an electric steering device that assists the steering wheel operation force or steers based on the steering angle set by the steering angle setting unit, the electric steering device including a drive motor that generates power based on a control signal transmitted from a controller, a pinion shaft connected to the drive motor and having a first gear formed on one side, and a drive shaft having a first gear and a second gear on one side. fit together An output shaft on which a second gear is formed, and a second gear disposed on one side of the first gear. meshing a first adjusting gear formed so as to be linearly movable along the rotation axis of the pinion shaft; and a second gear arranged to face the first adjusting gear. meshingA vehicle can be provided that includes a second adjusting gear formed so as to be linearly movable along the rotation axis of the pinion shaft, and an elastic member arranged between the first adjusting gear and the second adjusting gear.

[0023] This vehicle has a worm that rotates by receiving power from a vehicle drive motor, and a gearbox that is provided on the other side of the pinion shaft. meshing The device may further include a worm wheel.

[0024] The rotation axis of the pinion shaft may be formed to protrude from one side of the first gear. A key or a key groove may be formed in the outer circumferential surface of the protruding pinion shaft in the longitudinal direction. A key groove into which a key is inserted or a key to be inserted into the key groove may be formed in the inner circumferential surfaces of the first adjustment gear and the second adjustment gear.

[0025] The pinion shaft may further include a fixing member fixed to one side of the pinion shaft to prevent the second adjustment gear from coming off. An anti-detachment groove into which a part of the fixing member is inserted may be formed on an outer circumferential surface of the pinion shaft.

[0026] The fixing member may be formed in an O-ring shape with an opening formed on one side. [Effects of the Invention]

[0027] According to the present embodiments, the pinion shaft is provided with the first and second adjusting gears that are pressed against the output shaft gear, thereby compensating for the slippage caused by wear between the pinion shaft gear and the output shaft gear.

[0028] By preventing backlash between the pinion shaft gear and the output shaft gear, rattle noise can be prevented. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a diagram showing a schematic view of a vehicle. [Figure 2] FIG. 2 is a diagram schematically illustrating a connection structure of a steering actuator provided in an electric power-assisted steering device for a vehicle. [Figure 3] FIG. 3 is a diagram showing a schematic diagram of a connection structure of a steering actuator provided in a steer-by-wire type steering device of a vehicle. [Figure 4] FIG. 4 is a perspective view of a steering actuator for a vehicle according to one embodiment. [Figure 5] FIG. 5 is a diagram showing the internal configuration of the vehicle steering actuator shown in FIG. [Figure 6] FIG. 6 is a side view of the pinion shaft shown in FIG. [Figure 7] FIG. 7 is an exploded perspective view of the pinion shaft shown in FIG. [Figure 8] FIG. 8 is a view showing a state in which the first gear and the second gear are linearly moved by the elastic member. [Figure 9] FIG. 9 is a diagram schematically illustrating a connection structure of a steering actuator provided in a rack and pinion type steering device of a vehicle. DETAILED DESCRIPTION OF THE INVENTION

[0030] Some embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. When adding reference numerals to components in each drawing, identical components may have the same reference numerals whenever possible, even if they appear in different drawings. Furthermore, when describing the embodiments, if it is determined that a detailed description of related known structures or functions may obscure the gist of the present technical concept, such a detailed description may be omitted. When terms such as "include," "have," and "be made" are used in this specification, other terms may be added unless "only" is used. When a component is expressed in the singular, it may also include a plural unless otherwise expressly stated.

[0031] In describing components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. are used only to distinguish the component from other components, and do not limit the nature, order, sequence, or number of the corresponding components.

[0032] In describing the positional relationship of components, when two or more components are described as being "coupled," "coupled," or "connected," it should be understood that the two or more components can be directly "coupled," "coupled," or "connected," but that the two or more components can also be "coupled," "coupled," or "connected" through an additional "intervening" component. Here, the additional component can be included in one or more of the two or more components that are "coupled," "coupled," or "connected" to each other.

[0033] In describing the temporal flow relationship associated with components, operating methods, manufacturing methods, etc., when the temporal or flow precedence relationship is described using, for example, "after," "following," "next," or "before," it may also include cases where the relationship is not consecutive, unless "whereas" or "directly" is used.

[0034] On the other hand, when a numerical value or its corresponding information (e.g., level, etc.) for a component is mentioned, the numerical value or its corresponding information may be interpreted as including an error range that may occur due to various factors (e.g., process factors, internal or external impact, noise, etc.), even if not otherwise explicitly stated.

[0035] 1 is a schematic diagram of a vehicle. The vehicle 1 in this embodiment is not limited to the illustrated example and may include any vehicle that uses an internal combustion engine and an electric battery, such as a four-wheeled vehicle, a three-wheeled vehicle, or a two-wheeled vehicle.

[0036] The vehicle 1 of this embodiment can include a steering angle setting unit 104 that sets a steering angle based on the driving route set by the driving route setting unit 102, and an electric steering device that assists the operating force of the steering wheel 10 or allows steering based on the steering angle set by the steering angle setting unit 104.

[0037] More specifically, the driving route setting unit 102 can set a driving route taking into consideration the current position, the destination, traffic conditions, etc., and transmit the set driving route to the steering angle setting unit 104.

[0038] The steering angle setting unit 104 sets the steering angle of the vehicle 1 based on the travel route set by the travel route setting unit 102 , and can determine the steering angle suited to the travel situation and transmit it to the electronic control unit 400 .

[0039] The electronic control device 400 can assist the steering force of the steering wheel 10 or steer the wheel 10 according to the steering angle transmitted from the steering angle setting unit 104 .

[0040] The electric steering system can then either assist the driver's input or control the vehicle 1 completely autonomously.

[0041] Such electric steering systems include electric power-assisted steering systems and steer-by-wire (SBW) steering systems. Electric power-assisted steering systems use an electric motor such as a motor to assist the steering force of the steering wheel to facilitate driving. Steer-by-wire (SBW) steering systems use an electric motor such as a motor to steer the vehicle.

[0042] Fig. 2 is a diagram schematically illustrating a connection structure of a steering actuator provided in an electric power-assisted steering system for a vehicle, and Fig. 3 is a diagram schematically illustrating a connection structure of a steering actuator provided in a steer-by-wire type steering system for a vehicle.

[0043] Hereinafter, various embodiments will be described in detail with reference to the accompanying drawings.

[0044] 2, in the electric power-assist steering device 2 according to this embodiment, an angle sensor 106 and a torque sensor 108 are coupled to one side of a steering shaft 200 connected to a steering wheel 10. When a driver operates the steering wheel 10, the angle sensor 106 and the torque sensor 108 detect the operation of the steering wheel 10 and send an electric signal to an electronic control unit 400. The electronic control unit 400 sends an operation signal to a driving motor 180.

[0045] The electronic control unit 400 controls the drive motor 180 based on electrical signals transmitted from the angle sensor 106, the torque sensor 108, and other electrical signals transmitted from various sensors mounted on the vehicle.

[0046] 3, the steer-by-wire steering system 3 according to the present embodiment includes a steering device 101 disposed near the driver and a steering actuator 100 disposed near the wheels 20. An angle sensor 106 and a torque sensor 108 are coupled to one side of a steering shaft 200 connected to the steering wheel 10. When the driver operates the steering wheel 10, the angle sensor 106 and the torque sensor 108 detect the operation and send an electric signal to the electronic control unit 400. As a result, the reaction motor 121 and the drive motor 180 are operated.

[0047] The electronic control unit 400 controls the reaction motor 121 and the driving motor 180 based on the electrical signals transmitted from the angle sensor 106 and the torque sensor 108, as well as electrical signals transmitted from various other sensors installed in the automobile.

[0048] For ease of explanation, the drawings in the present embodiments illustrate the angle sensor 106 and torque sensor 108 provided on the steering shaft 200 as steering sensors, but other sensors may be provided, such as a speed sensor, a wheel steering angle sensor, a motor position sensor, and various radar, LIDAR, and camera image sensors, for transmitting steering information to the electronic control unit 400. Detailed descriptions of these various sensors will be omitted. Figure 4 is a perspective view of a vehicle steering actuator according to an embodiment, Figure 5 is a diagram showing the internal configuration of the vehicle steering actuator shown in Figure 4, and Figure 6 is a side view of the pinion shaft shown in Figure 5.

[0049] Referring to Figures 4 to 6, the vehicle steering actuator 100 may include a housing 110, a worm 120, a pinion shaft 130, an output shaft 140, a first adjusting gear 150, a second adjusting gear 160, and an elastic member 170.

[0050] The housing 110 is for protecting the components located inside and may be provided on one side of the drive motor 180. For example, a plurality of housings 110 may be provided to cover the pinion shaft 130 and the output shaft 140, which will be described later. This may prevent foreign matter from penetrating the pinion shaft 130 and the output shaft 140, and may also block noise generated by the pinion shaft 130 and the output shaft 140.

[0051] The worm 120 can rotate by receiving power from the drive motor 180. For example, the worm 120 can be connected to a rotary shaft of the drive motor 180 and can be rotatably supported within the housing 110 via bearings.

[0052] The pinion shaft 130 may be connected to a steering shaft and may include a worm wheel 131 and a first gear 132 spaced apart from the worm wheel 131. For example, in the drawing, the worm wheel 131 may be provided on the upper side of the pinion shaft 130, and the first gear 132 may be provided on the lower side.

[0053] The worm wheel 131 is disposed on the side of the worm 120 and is connected to the worm 120. fit together For example, the worm wheel 131 is installed on the outer circumferential surface of the pinion shaft 130 connected to the steering shaft, and can transmit the rotational force of the worm 120 driven by the drive motor 180 to the steering shaft.

[0054] The first gear 132 may be formed on the outer circumferential surface of the pinion shaft 130. In this embodiment, the first gear 132 is formed integrally with the pinion shaft 130, but the pinion shaft 130 and the first gear 132 may be provided separately and then the first gear 132 may be coupled to one side of the pinion shaft 130.

[0055] The output shaft 140 has a first gear 132 on one side and a fit together A second gear 141 may be formed. Accordingly, the second gear 141 can receive a rotational force from the first gear 132 and rotate.

[0056] The pinion shaft 130 and the output shaft 140 may be arranged in the same direction or adjacent to each other. The first gear 132 and the second gear 141 provided on the pinion shaft 130 and the output shaft 140, respectively, may be helical gears with inclined sawtooth. As a result, the rotation axis 130a of the pinion shaft 130 and the rotation axis 140a of the output shaft 140 have parallel axes to each other, allowing power to be transmitted.

[0057] A pitman arm 142 may be coupled to the rotation axis 140a of the output shaft 140. For example, one end of the pitman arm 142 may be connected to the lower end of the output shaft 140, and the other end may be connected to a tie rod or a knuckle arm, so that the wheels of the vehicle may be steered by rotation of the pitman arm 142.

[0058] The first adjusting gear 150 is disposed on one side of the first gear 132 and is connected to the second gear 141. meshing , may be formed to be linearly movable along the rotation axis 130a of the pinion shaft 130. For example, the first adjusting gear 150 may be disposed below the first gear 132 and formed to have the same tooth shape as the first gear 132. That is, if the first gear 132 is formed as a helical gear, the first adjusting gear 150 may also be formed as a helical gear.

[0059] The second adjusting gear 160 is disposed to face the first adjusting gear 150 and is connected to the second gear 141. meshing , may be formed to be linearly movable along the rotation axis 130a of the pinion shaft 130. The second adjusting gear 160 may be formed with the same tooth type as the first gear 132, just like the first adjusting gear 150. In this way, the first adjusting gear 150 and the second adjusting gear 160 are formed to have the same tooth type as the first gear 132, so that the second gear 141 can be axially moved along the rotation axis 130a of the pinion shaft 130. fit together Therefore, when the second gear 141 rotates, the first gear 132, the first adjustment gear 150, and the second adjustment gear 160 can rotate simultaneously.

[0060] The elastic member 170 may be disposed between the first adjustment gear 150 and the second adjustment gear 160. For example, the elastic member 170 may be a circular disc spring. Although the elastic member 170 is illustrated as being formed of a disc spring in this embodiment, it may be embodied in various other forms that can be compressed and restored, such as a coil spring, a leaf spring, etc.

[0061] The elastic member 170 may have a through-hole 171 formed in the center thereof, through which the rotation axis 130a of the pinion shaft 130 passes. At this time, the width of the elastic member 170 may be formed smaller than the width of the first gear 132 to prevent the elastic member 170 from interfering with the outer case. As such, by providing the elastic member 170 between the first adjustment gear 150 and the second adjustment gear 160, the first adjustment gear 150 and the second adjustment gear 160 are movable in opposite directions along the rotation axis 130a of the pinion shaft 130.

[0062] FIG. 7 is an exploded perspective view of the pinion shaft shown in FIG.

[0063] 7, the rotation axis 130a of the pinion shaft 130 is formed to protrude from one side of the first gear 132. A key 133 or a key groove 134 may be formed in the length direction on the outer circumferential surface of the protruding pinion shaft 130. The first adjustment gear 150 and the second adjustment gear 160 may be formed with key grooves 151 and 161 into which the key 133 of the pinion shaft 130 is inserted, or with keys 152 and 162 that are inserted into the key groove 134 of the pinion shaft 130.

[0064] For example, if a key groove 134 is formed on the rotation axis 130a of the pinion shaft 130, keys 152 and 162 that are inserted into the key groove 134 of the pinion shaft 130 are formed on the inner circumferential surfaces of the first adjustment gear 150 and the second adjustment gear 160. If a key 133 is formed on the rotation axis 130a of the pinion shaft 130, key grooves 151 and 161 that the key 133 of the pinion shaft 130 is inserted into may be formed on the inner circumferential surfaces of the first adjustment gear 150 and the second adjustment gear 160. With this structure, the first adjustment gear 150 and the second adjustment gear 160 are able to move linearly along the rotation axis 130a of the pinion shaft 130.

[0065] According to this embodiment, the pinion shaft 130 may further include a fixing member 190 fixed to one side thereof to prevent separation of the second adjusting gear 160. For example, a separation prevention groove 130b may be formed on the outer circumferential surface of the pinion shaft 130. The fixing member 190 may be fixed to the pinion shaft 130 in such a manner that a portion of its inner surface is inserted into the separation prevention groove 130b.

[0066] The fixing member 190 may be formed in an O-ring shape with an opening formed on one side, and may be made of a metal or resin material that is deformable and resilient. By forming an opening on one side of the fixing member 190, the fixing member 190 can be opened or closed through the opening. Therefore, when the fixing member 190 is seated in the separation prevention groove 130b through the opening, the fixing member 190 can be stably fixed to the pinion shaft 130.

[0067] By fixing the fixed member 190 to the anti-detachment groove portion in this manner, the first adjustment gear 150, the second adjustment gear 160, and the elastic member 170 sandwiched between the rotating shaft 130a of the pinion shaft 130 can be prevented from detaching from the pinion shaft 130.

[0068] FIG. 8 shows a state in which the first gear and the second gear are linearly moved by the elastic member.

[0069] 8, the elastic member 170 disposed between the first and second adjusting gears 150 and 160 allows the first and second adjusting gears 150 and 160 to move linearly in opposite directions along the rotation axis 130a of the pinion shaft 130. For example, the first adjusting gear 150 moves upward along the rotation axis 130a of the pinion shaft 130, and the second adjusting gear 160 moves downward along the rotation axis 130a of the pinion shaft 130.

[0070] At this time, the sawtooth of the first adjusting gear 150 and the second adjusting gear 160 is inclined, so when the first adjusting gear 150 moves upward, the sawtooth of the first adjusting gear 150 can have a yaw that rotates in a left direction from the top of the drawing. Conversely, when the second adjusting gear 160 moves downward, the sawtooth of the second adjusting gear 160 can have a yaw that rotates in a right direction from the top of the drawing. Therefore, when the first adjusting gear 150 and the second adjusting gear 160 move in a right direction from the top of the drawing, the first adjusting gear 150 and the second adjusting gear 160 can rotate in a right direction from the top of the drawing. fit together At this time, the sawtooth of the first adjusting gear 150 and the second adjusting gear 160 press the sawtooth of the second gear 141 in opposite directions, so that the coupling force can be increased.

[0071] Even if a gap occurs between the first gear 132 and the second gear 141 due to wear of the first gear 132 and the second gear 141, the sawtooth of the first adjusting gear 150 and the second adjusting gear 160 can be brought into close contact with the sawtooth of the second gear 141 by the elastic member 170, thereby compensating for the gap. Therefore, backlash occurring between the first gear 132 of the pinion shaft 130 and the second gear 141 of the output shaft 140 can be prevented, and rattle noise due to the backlash can also be prevented.

[0072] In this embodiment, the first adjusting gear 150, the second adjusting gear 160, and the elastic member 170 are provided on the rotation axis 130a of the pinion shaft 130, but a plurality of them may be provided. In this case, when a gap occurs between the first gear 132 and the second gear 141, the second gear 141 and fit together The larger area allows for more effective prevention of rattle noise.

[0073] FIG. 9 is a diagram schematically illustrating a connection structure of a steering actuator provided in a rack and pinion type steering device of a vehicle.

[0074] Referring to Figure 9, a rack gear is provided on one side of the connecting shaft. fit together A steering actuator having a structure in which a pinion gear is formed and a steering shaft 200 is connected to the other side will be described.

[0075] Referring to FIGS. 1 and 9, the vehicle 1 may include a steering shaft 200, a steering actuator 100, a torque sensor 118, a controller 400, a rack bar 500, and a connecting shaft 600.

[0076] The steering shaft 200 may be connected to a steering wheel 10 disposed in the driver's seat (S) of the vehicle 1. For example, one side of the steering shaft 200 may be connected to the steering wheel 10 and rotate together with the steering wheel 10, and the other side may be connected to a connecting shaft 600 described below.

[0077] The steering actuator 100 is configured as an auxiliary power device that reduces the driver's effort. The steering actuator 100 includes a housing 110, a worm 120, a pinion shaft 130, an output shaft 140, a first adjusting gear 150, a second adjusting gear 160, an elastic member 170, a driving motor 180, and a fixed member 190. Here, the steering actuator 100 has the same configuration as described above, so a detailed description will be omitted.

[0078] The torque sensor 118 can detect torque applied to the steering wheel 10 and output an electrical signal proportional to the torque. For example, the torque sensor 118 can be installed on one side of the steering wheel 10 to detect the twist of the steering wheel 10.

[0079] The controller 400 can generate a control signal based on the electrical signal transmitted from the torque sensor 118 and transmit it to the drive motor 180. As a result, the drive motor 180 can generate power based on the control signal transmitted from the controller 400. Specifically, when the amount of torsion of the steering wheels 10 sensed by the torque sensor 118 is transmitted to the controller 400, the controller 400 can determine a current according to the amount of torsion of the steering wheels 10 for each vehicle speed using preset logic and output the current to the drive motor 180. In other words, the rotation speed of the drive motor 180 can change depending on the vehicle speed and the amount of torsion of the steering wheels 10. As a result, a steering assist force can be provided by controlling the drive motor 180 according to the steering angle of the steering wheels 10.

[0080] The rack bar 500 is connected to a wheel of the vehicle 1, and may have a rack gear 510 formed on one side thereof. For example, the rack bar 500 may be formed in a cone shape, and the rack gear 510 may be formed by processing one side thereof.

[0081] The connecting shaft 600 has a rack gear 510 on one side. fit together The pinion gear 610 is formed on the connecting shaft 600, and the other side can be connected to the steering shaft 200. In this way, the pinion gear 610 of the connecting shaft 600 and the rack gear 510 of the rack bar 500 fit together As a result, the rotational motion transmitted from the steering shaft 200 is converted into linear motion, making it possible to control the angle of the wheels 20.

[0082] The above description is merely an illustrative example of the technical idea of ​​the present disclosure, and various modifications and variations may be made by a person skilled in the art without departing from the essential characteristics of the technical idea of ​​the present disclosure. Furthermore, the present examples are intended to illustrate, rather than limit, the technical idea of ​​the present disclosure, and therefore the scope of the technical idea of ​​the present disclosure is not limited by these examples. [Explanation of symbols]

[0083] 100 Steering actuator 110 Housing 120 Worm 130 pinion shaft 131 Worm Wheel 132 First Gear 140 output shaft 141 2nd Gear 150 First Adjustment Gear 160 Second adjustment gear 170 Elastic member 180 drive motor 190 Fixing member 200 Steering axis 300 Torque Sensor 400 Controller 500 Rack Bar 600 connecting shaft

Claims

1. a pinion shaft connected to the steering shaft and having a first gear formed on one side thereof; an output shaft having a second gear formed on one side thereof, the second gear engaging with the first gear; a first adjusting gear disposed on one side of the first gear to engage with the second gear and configured to be linearly movable along the rotation axis of the pinion shaft; a second adjustment gear disposed to face the first adjustment gear, engaging with the second gear, and formed to be linearly movable along the rotation axis of the pinion shaft; a resilient member disposed between the first adjusting gear and the second adjusting gear.

2. a worm that rotates by receiving power from a drive motor; 2. The steering actuator for a vehicle according to claim 1, further comprising: a worm wheel provided on the other side of the pinion shaft and meshing with the worm.

3. The rotation axis of the pinion shaft is formed to protrude from one side of the first gear, A key or a key groove is formed in the outer peripheral surface of the protruding pinion shaft in the longitudinal direction, The steering actuator for a vehicle according to claim 1 , wherein the first adjustment gear and the second adjustment gear are formed with a key groove into which the key is inserted or a key that is inserted into the key groove.

4. The steering actuator for a vehicle according to claim 1 , wherein the first gear and the second gear are provided by helical gears.

5. The vehicle steering actuator according to claim 1 , wherein the first and second adjusting gears are formed with the same tooth profile as the first gear.

6. 2. The steering actuator for a vehicle according to claim 1, wherein the elastic member is a disc spring having a through hole formed at its center, through which the rotation axis of the pinion shaft passes.

7. The steering actuator for a vehicle according to claim 1 , wherein the width of the elastic member is smaller than the width of the first gear.

8. a fixing member fixed to one side of the pinion shaft to prevent the second adjusting gear from coming off, 2. The vehicle steering actuator according to claim 1, wherein an anti-detachment groove into which a part of the fixing member is inserted is formed on an outer peripheral surface of the pinion shaft.

9. 9. The steering actuator for a vehicle according to claim 8, wherein the fixing member is formed in an O-ring shape with an opening formed on one side.

10. 2. The steering actuator for a vehicle according to claim 1, wherein the first and second adjusting gears are linearly moved in opposite directions by the elastic member to compensate for the interference between the first and second gears.

11. The steering actuator for a vehicle according to claim 1 , wherein a plurality of the first adjusting gear, the second adjusting gear, and the elastic member are provided.

12. a drive motor that generates power based on a control signal transmitted from a controller; a pinion shaft connected to the driving motor and having a first gear formed on one side thereof; an output shaft having a second gear formed on one side thereof, the second gear engaging with the first gear; a first adjusting gear disposed on one side of the first gear to engage with the second gear and configured to be linearly movable along the rotation axis of the pinion shaft; a second adjustment gear disposed to face the first adjustment gear, engaging with the second gear, and formed to be linearly movable along the rotation axis of the pinion shaft; an elastic member disposed between the first adjusting gear and the second adjusting gear.

13. a worm that rotates by receiving power from the drive motor; 13. The electric steering device according to claim 12, further comprising a worm wheel provided on the other side of the pinion shaft and meshing with the worm.

14. The rotation axis of the pinion shaft is formed to protrude from one side of the first gear, A key or a key groove is formed in the outer peripheral surface of the protruding pinion shaft in the longitudinal direction, The electric steering device according to claim 12, wherein the first adjusting gear and the second adjusting gear are formed with a key groove into which the key is inserted or a key that is inserted into the key groove.

15. a fixing member fixed to one side of the pinion shaft to prevent the second adjusting gear from coming off, 13. The electric steering system according to claim 12, wherein an anti-detachment groove into which a part of the fixing member is inserted is formed on an outer peripheral surface of the pinion shaft.

16. a steering angle setting unit that sets a steering angle of the vehicle based on the travel route set by the travel route setting unit; an electric steering device that assists the steering wheel operating force or steers the vehicle based on the steering angle set by the steering angle setting unit, The electric steering device includes: a drive motor that generates power based on a control signal transmitted from a controller; a pinion shaft connected to the driving motor and having a first gear formed on one side thereof; an output shaft having a second gear formed on one side thereof, the second gear engaging with the first gear; a first adjusting gear disposed on one side of the first gear to engage with the second gear and configured to be linearly movable along the rotation axis of the pinion shaft; a second adjustment gear disposed to face the first adjustment gear, engaging with the second gear, and formed to be linearly movable along the rotation axis of the pinion shaft; an elastic member disposed between the first adjustment gear and the second adjustment gear.

17. a worm that rotates by receiving power from the drive motor; 17. The vehicle according to claim 16, further comprising: a worm wheel provided on the other side of the pinion shaft and meshing with the worm.

18. The rotation axis of the pinion shaft is formed to protrude from one side of the first gear, A key or a key groove is formed in the outer peripheral surface of the protruding pinion shaft in the longitudinal direction, The vehicle according to claim 16, wherein a key groove into which the key is inserted or a key to be inserted into the key groove is formed on inner circumferential surfaces of the first adjustment gear and the second adjustment gear.

19. a fixing member fixed to one side of the pinion shaft to prevent the second adjusting gear from coming off, The vehicle according to claim 16, wherein an anti-detachment groove into which a part of the fixing member is inserted is formed on an outer peripheral surface of the pinion shaft.

20. The vehicle according to claim 19, wherein the fixing member is formed in an O-ring shape with an opening formed on one side.

Images