Vehicle steering apparatus

Abstract

A vehicle steering apparatus includes an actuator rod axially sliding and provided with a fastening hole on one side of an outer peripheral surface of the actuator rod, a rod fastening member having an upper end coupled to a magnet assembly and a lower end coupled to the fastening hole, and a rod housing coupled to the rod fastening member and having a lower end coupled to the magnet assembly. The rod fastening member is provided with a rod hole through which the actuator rod slides, and a receiving hole which communicates with the rod hole and is open is provided on one side of the outer peripheral surface of the rod housing, and a pair of support members which are supported on both inner side surfaces of the receiving hole so as to axially slide together with the actuator rod, and which are disposed separately on both radial-direction sides of the rod fastening member. And an elastic member coupled to an outer peripheral surface of the rod fastening member to elastically support the support member toward both inner side surfaces of the accommodation hole.

Description

Technical Field

[0001] The present embodiment relates to a vehicle steering device. More specifically, the device improves steering angle measurement accuracy by precisely measuring changes in the axial displacement of an actuator rod. Furthermore, the device minimizes noise and vibration even after being subjected to impact and vibration transmitted from the road surface, while maintaining steering angle measurement accuracy, thereby improving durability. Background Art

[0002] A vehicle steering device is typically equipped with a hydraulic device, a motor, a reducer, etc. to steer the vehicle's wheels according to the vehicle's driving conditions. The vehicle steering device typically operates in the rear wheels of an ordinary vehicle or the front and rear wheels of a wire-controlled steer system.

[0003] In vehicle steering systems, sensors that sense the movement of magnets are used to measure the axial movement of the actuator rod. Furthermore, sensors measure the displacement of objects that perform linear reciprocating motion, which the electronic control unit uses to achieve stable control of vehicle rotation.

[0004] However, such a conventional vehicle steering device cannot accurately measure the axial displacement change of the actuator rod due to problems such as the installation structure of the magnet, sensor and peripheral components, resulting in a decrease in the measurement accuracy of the steering angle.

[0005] Furthermore, when a vehicle is subjected to shock and vibration transmitted from the road surface while driving, noise and vibration increase, causing a sharp drop in steering angle measurement accuracy. Therefore, research is ongoing to improve durability. Summary of the Invention

[0006] Therefore, the present embodiment is proposed in the above context, and aims to provide a vehicle steering device, which improves the measurement accuracy of the steering angle by accurately measuring the axial displacement change of the actuator rod, and can still minimize noise and vibration after being subjected to impact and vibration transmitted from the road surface, and can maintain the accuracy of the steering angle measurement, thereby improving durability.

[0007] From one aspect, this embodiment can provide a vehicle steering device, including: an actuator rod, which slides axially and is provided with a fastening hole on one side of the outer peripheral surface of the actuator rod, a rod fastening member, one end of the rod fastening member is combined with the magnet assembly and the other end is combined with the fastening hole, a rod housing, which is provided with a rod hole for sliding the actuator rod and is provided with a accommodating hole connected to the rod hole on one side of the outer peripheral surface of the rod housing, a pair of support members, which support and are combined with the inner two side surfaces of the accommodating hole to slide axially with the actuator rod, and the pair of support members are separately arranged on both sides of the radius direction of the rod fastening member, and an elastic member, which is combined with the outer peripheral surface of the rod fastening member to elastically support the support member.

[0008] In addition, this embodiment can provide a vehicle steering device, including: an actuator rod, which slides axially and is provided with a fastening hole on one side of the outer circumference of the actuator rod, a rod fastening member, one end of the rod fastening member is combined with the magnet assembly and the other end is combined with the fastening hole, a rod housing, which is provided with a rod hole for sliding the actuator rod and is provided with a accommodating hole connected to the rod hole on one side of the outer circumference of the rod housing, a pair of support members, which support and are combined with the inner two side surfaces of the accommodating hole to slide axially together with the actuator rod, and the pair of support members are separately arranged on both sides of the radius direction of the rod fastening member, and an elastic support member, which is combined with the inner circumference of the support member to elastically support the rod fastening member.

[0009] According to the present embodiment as described above, a vehicle steering device can be provided that improves the measurement accuracy of the steering angle by accurately measuring the axial displacement change of the actuator rod, minimizes noise and vibration after being subjected to impact and vibration transmitted from the road surface, and maintains the accuracy of the steering angle measurement, thereby improving durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 and Figure 2 1 is a perspective view showing a vehicle steering device according to the present embodiment.

[0011] Figure 3 1 is an exploded perspective view showing the vehicle steering device according to the present embodiment.

[0012] Figure 4 1 is a perspective view showing a vehicle steering device according to the present embodiment.

[0013] Figure 5 and Figure 6 1 is an exploded perspective view showing the vehicle steering device according to the present embodiment.

[0014] Figure 7 : is a front view showing the vehicle steering device according to the present embodiment.

[0015] Figure 8 and Figure 9 is a cross-sectional view showing the vehicle steering device according to the present embodiment. DETAILED DESCRIPTION

[0016] Hereinafter, the present embodiment will be described in detail with reference to the exemplary drawings. When assigning figure marks to the constituent elements in each drawing, the same figure marks shall be used as much as possible for the same constituent elements even if they are represented in different drawings. In addition, when describing the present embodiment, when it is judged that a detailed description of the relevant well-known structure or function will make the gist of the technical idea of ​​the present disclosure unclear, the detailed description may be omitted. The terms used in this specification, such as "including", "having", "consisting of...", etc., are generally intended to allow the addition of other parts, unless these terms are used together with the term "only". When a constituent element is expressed in the singular, the plural form may be included unless otherwise expressly stated.

[0017] In addition, in the description of the components of this embodiment, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are used only to distinguish a component from other components, and the nature, order, sequence, or number of the corresponding components are not limited by these terms.

[0018] In the description of the positional relationship of constituent elements, when it is stated that two or more constituent elements are "connected," "coupled," or "linked," it should be understood that the two or more constituent elements may be directly "connected," "coupled," or "linked," or that the two or more constituent elements may be "connected," "coupled," or "linked" with other constituent elements "interposed." The other constituent elements may include one or more of the two or more constituent elements that are "connected," "coupled," or "linked" to each other.

[0019] In the description of the temporal flow relationship related to constituent elements, action methods or manufacturing methods, when the temporal sequence relationship or process sequence relationship is described through words such as "after", "next", "then", "before", etc., discontinuous situations may also be included unless "immediately" or "directly" is used.

[0020] On the other hand, even without additional explicit explanation, when referring to a numerical value or its corresponding information (e.g., level, etc.) for a constituent element, the numerical value or its corresponding information should be interpreted as including the error range that may be caused by various factors (e.g., process factors, internal or external impact, noise, etc.).

[0021] Figure 1 and Figure 2 is a perspective view showing a vehicle steering device according to this embodiment, Figure 3 is an exploded perspective view showing a vehicle steering device according to this embodiment, Figure 4 is a perspective view showing a vehicle steering device according to this embodiment, Figure 5 and Figure 6is an exploded perspective view showing a vehicle steering device according to this embodiment, Figure 7 is a front view showing a vehicle steering device according to the present embodiment, Figure 8 and Figure 9 is a cross-sectional view showing the vehicle steering device according to the present embodiment.

[0022] First, if Figures 1 to 8 As shown, the vehicle steering device 100 according to this embodiment includes: an actuator rod 120, which slides axially and is provided with a fastening hole 123 on one side of the outer peripheral surface; a rod fastening member 150, one end of which is combined with the magnet assembly 170 and the other end is combined with the fastening hole 123; a rod housing 101, which has a rod hole 104 for sliding the actuator rod 120 and has a receiving hole 135 on one side of the outer peripheral surface that is connected to the rod hole 104; a pair of support members 140, which support and are combined to the inner two side surfaces of the receiving hole 135 to slide axially with the actuator rod 120, and are separately arranged on both sides of the radius direction of the rod fastening member 150; and an elastic member 160, which is combined with the outer peripheral surface of the rod fastening member 150 to elastically support the support member 140.

[0023] The vehicle steering device 100 according to the present embodiment performs steering of the vehicle while the actuator rod 120 performs linear motion in an axially sliding manner, and sends the change in the axial displacement to the electronic control device 107 by using the sensor assembly 110 to sense the change in the magnetic field of the magnet 171 built into the magnet assembly 170 that slides linearly together with the actuator rod 120, thereby calculating the steering angle.

[0024] The actuator rod 120 is built into the rod housing 101 for axial linear motion, and the rod fastening member 150 and the support member 140 are coupled to the actuator rod 120 to slide axially together with the actuator rod 120 inside the rod housing 101 .

[0025] Such an actuator rod 120 is threadedly coupled to a ball nut (not shown) to achieve axial sliding through a belt (not shown) that transmits the driving force of the motor 105. The electronic control unit 107 calculates the steering angle by the change in the magnetic field of the magnet 171 sensed by the sensor assembly 110, thereby controlling the drive of the motor 105.

[0026] The motor 105 , the belt, the ball nut, and the like are built into the driving portion housing 103 coupled to one side of the rod housing 101 , and detailed description of these built-in components will be omitted.

[0027] Wheel connection brackets 109 a and 109 b coupled to the rod wheel and vehicle body fixing holes 101 a and 103 a for fixing to a vehicle body are provided on the rod housing 101 and the driving unit housing 103 .

[0028] A flat surface portion 121 cut along a plane is provided on one side of an outer peripheral surface of the actuator rod 120 , and a fastening hole 123 is provided on the flat surface portion 121 to be coupled with the rod fastening member 150 .

[0029] Therefore, when the actuator rod 120 slides, the rod fastening member 150 can maintain the actuator rod 120 at an accurate position and in an accurate sliding direction.

[0030] like Figure 3 and Figure 4 As shown, the rod fastening member 150 has its upper end coupled to the magnet assembly 170 and its lower end coupled to the actuator rod 120 to slide axially together with the actuator rod 120 .

[0031] like Figure 3 As shown, the rod housing 101 has a rod hole 104 for sliding the actuator rod 120 , and an accommodating hole 135 communicating with the rod hole 104 and opening upward is provided on one side of the outer peripheral surface of the rod housing 101 .

[0032] A box-shaped housing portion 102 is formed on one side of the rod housing 101 , and a housing hole 135 is provided in an inner space of the housing portion 102 .

[0033] Therefore, when the actuator rod 120 slides, the sensor assembly 110 can stably sense the change in the magnetic field of the magnet 171 at the closest position.

[0034] The pair of support members 140 are separated and disposed on both radial sides of the rod fastening member 150 , supported and coupled to both inner side surfaces of the accommodation hole 135 , and axially slide together with the actuator rod 120 .

[0035] Also, the elastic member 160 coupled to the outer peripheral surface of the rod fastening member 150 elastically supports the supporting member 140 toward both inner side surfaces of the accommodation hole 135 .

[0036] The elastic member 160 formed in a ring shape can be formed of one or more materials selected from the group consisting of natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene propylene diene monomer (EPDM), fluororubber (FPM), styrene butadiene rubber (SBR), chlorosulfonated polyethylene rubber (CSM), polyurethane (PU), and silicone rubber.

[0037] Therefore, by allowing the elastic member 160 to continuously elastically support the supporting member 140 toward both inner side surfaces of the receiving hole 135 , noise and vibration caused by the gap between the supporting member 140 and the receiving hole 135 can be prevented and the accuracy of sliding position sensing can be improved.

[0038] In this embodiment, the elastic member 160 is made of nitrile rubber having good oil resistance, oxidation resistance, ozone resistance, and weather resistance.

[0039] like Figure 6 As shown, the support member 140 includes a first support member 140a and a second support member 140b that are symmetrically separated. A coupling protrusion 141 is provided on one of the opposite surfaces of the first support member 140a and the second support member 140b, and a coupling groove 142 coupled with the coupling protrusion 141 is provided on the other, or a coupling groove 142 is provided on one of the opposite surfaces, and a coupling protrusion 141 coupled with the coupling groove 142 is provided on the other.

[0040] The coupling protrusion 141 and the coupling groove 142 can set the coupling position of the first support member 140a and the second support member 140b during assembly, and can prevent the actuator rod 120 from being dislocated due to the elastic force of the elastic member 160 when the actuator rod 120 slides and keep it in the correct position.

[0041] The support member 140 may be made of one or more materials selected from the group consisting of polyoxymethylene (POM), polyamide (PA), polycarbonate (PC), polyimide (PI), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS) and phenolic resin (PF), and may be formed by mixing 20 to 60 weight % of glass fiber.

[0042] Therefore, it can have predetermined elasticity and wear resistance, absorb vibration and impact sound generated during operation and minimize the degree of wear.

[0043] In addition, a coating layer 140T formed by coating with polytetrafluoroethylene (PTFE) material may be provided on the outer side of the support member 140 .

[0044] In such a support member 140 , support grooves 148 recessed from the outer side surface may be provided on both inner side surfaces of the receiving hole 135 of the rod housing 101 , and a plurality of support grooves 148 may be provided spaced apart from each other.

[0045] Furthermore, the support groove 148 is filled with lubricant, so that friction with the inner side surface of the accommodation hole 135 of the rod housing 101 can be minimized when the support member 140 slides in the axial direction.

[0046] Reference Figures 5 to 8 The rod fastening member 150 may include: a main body 151, on the outer peripheral surface of which is provided a placement protrusion 154 protruding in the radial direction and placed on the plane portion 121; a threaded fastening portion 153, which is arranged on the lower side of the placement protrusion 154 and has a threaded portion 153a formed on the outer peripheral surface to be combined with the fastening hole 123; and a head 155, which is arranged on the upper side of the main body 151 and has a tool fastening surface 156 on the outer peripheral surface.

[0047] A reduced diameter portion 158 having a reduced diameter is provided on the upper side of the seating protrusion 154 in the outer peripheral surface of the main body 151 , and an insertion protrusion 143 inserted into the reduced diameter portion 158 is provided at the lower end of the support member 140 .

[0048] In addition, an outer peripheral groove 151a coupled to the elastic member 160 is provided on the outer peripheral surface of the main body 151, and an inner peripheral groove 145 is provided at a position opposite to the outer peripheral groove 151a in the inner peripheral surface of the support member 140, and the elastic member 160 is inserted and supported in the inner peripheral groove 145.

[0049] In addition, refer to Figure 6 and Figure 7 A small-diameter portion 146 is provided at the upper end of the support member 140, protruding toward the head 155 side of the rod fastening member 150, and a head accommodating space 147 for accommodating the head 155 is provided on the inner side of the small-diameter portion 146, so that the support member 140 will not be detached in the upper and lower directions of the rod fastening member 150 and can be maintained in the correct position.

[0050] A magnet assembly 170 is supported and combined at the upper end of the rod fastening member 150, and a magnet 171 is built into the inner side of the magnet assembly 170, so that the sensor assembly 110 can sense the axial displacement change of the actuator rod 120 through the change of the magnetic field when the actuator rod 120 slides axially.

[0051] An insertion support groove 155 a is provided at the upper end of the head 155 of the rod fastening member 150 , and the insertion support portion 130 of the magnet assembly 170 is inserted into the insertion support groove 155 a so that the magnet assembly 170 can axially slide together with the support member 140 .

[0052] Furthermore, a sensor cover 113 and the sensor assembly 110 fixed to the upper opening of the accommodating hole 135 are provided on the upper portion of the magnet assembly 170 .

[0053] The sensor cover 113 is provided with a housing fastening hole 113 a , so that the sensor cover 113 is coupled to the upper end of the opening of the rod housing 101 via a fixing member 114 and protects the internal electronic components of the sensor assembly 110 .

[0054] A connection terminal 111 electrically connected to the electronic control unit 107 is provided on one side of an upper end of the sensor cover 113 .

[0055] In addition, with Figures 1 to 7 Refer to it together Figure 9 According to the present embodiment, the vehicle steering device may include: an actuator rod 120, which slides axially and is provided with a fastening hole 123 on one side of its outer circumference; a rod fastening member 150, one end of which is combined with the magnet assembly 170 and the other end is combined with the fastening hole 123; a rod housing 101, which is provided with a rod hole 104 for sliding the actuator rod 120, and is provided with a receiving hole 135 connected to the rod hole 104 on one side of its outer circumference; a pair of support members 140, which support and are combined with the inner two side surfaces of the receiving hole 135 to slide axially together with the actuator rod 120 and are separately arranged on both sides of the radius direction of the rod fastening member 150; and an elastic support member 160-1, which is combined with the inner circumference of the support member 140 to elastically support the rod fastening member 150.

[0056] The actuator rod 120, the rod housing 101, the magnet assembly 170, the sensor assembly 110 and the above Figures 1 to 8 Detailed description of these components will be omitted below.

[0057] A pair of support members 140 are separated and arranged on both sides of the rod fastening member 150 in the radial direction, and are supported on both side surfaces inside the accommodation hole 135 so as to slide axially together with the actuator rod 120 .

[0058] The support member 140 may be provided on an inner circumferential surface thereof with a fixing groove 149 into which the elastic support member 160 - 1 is inserted for fixing.

[0059] The arc-shaped elastic support member 160 - 1 may be formed of one or more materials selected from the group consisting of natural rubber, nitrile rubber, chloroprene rubber, EPDM rubber, fluororubber, styrene-butadiene rubber, chlorosulfonated polyethylene rubber, polyurethane, and silicone rubber.

[0060] In this embodiment, the elastic supporting member 160 - 1 is made of nitrile rubber having good oil resistance, oxidation resistance, ozone resistance and weather resistance.

[0061] The support member 140 includes a first support member 140a and a second support member 140b that are symmetrically separated. A coupling protrusion 141 is provided on one of the opposing surfaces of the first support member 140a and the second support member 140b, and a coupling groove 142 coupled with the coupling protrusion 141 is provided on the other. Alternatively, a coupling groove 142 is provided on one of the opposing surfaces, and a coupling protrusion 141 coupled with the coupling groove 142 is provided on the other.

[0062] The support member 140 may be made of one or more materials selected from the group consisting of polyoxymethylene, polyamide, polycarbonate, polyimide, polybutylene terephthalate, polyphenylene sulfide, and phenolic resin, and may be formed by mixing 20 to 60 weight % of glass fiber.

[0063] In addition, a coating layer 140T formed by coating with polytetrafluoroethylene (PTFE) material may be provided on the outer side of the support member 140 .

[0064] In such a support member 140 , support grooves 148 recessed from the outer side surface may be provided on both inner side surfaces of the receiving hole 135 of the rod housing 101 , and a plurality of support grooves 148 may be provided spaced apart from each other.

[0065] Furthermore, the support groove 148 is filled with lubricant, so that friction with the inner side surface of the accommodation hole 135 of the rod housing 101 can be minimized when the support member 140 slides in the axial direction.

[0066] A magnet assembly 170 is supported and combined at the upper end of the rod fastening member 150, and a magnet 171 is built into the inner side of the magnet assembly 170, so that the sensor assembly 110 can sense the axial displacement change of the actuator rod 120 through the change of the magnetic field when the actuator rod 120 slides axially.

[0067] An insertion support groove 155 a is provided at the upper end of the head 155 of the rod fastening member 150 , and the insertion support portion 130 of the magnet assembly 170 is inserted into the insertion support groove 155 a so that the magnet assembly 170 can axially slide together with the support member 140 .

[0068] Furthermore, a sensor cover 113 and a sensor assembly 110 fixed to an upper opening of the receiving hole 135 are provided on the upper portion of the magnet assembly.

[0069] The rod fastening member 150 may include: a main body 151, on the outer peripheral surface of which is provided a seating protrusion 154 protruding in the radial direction and seated on the plane portion 121; a threaded fastening portion 153, arranged on the lower side of the seating protrusion 154 and combined with the fastening hole 123; and a head 155, arranged on the upper side of the main body 151 and on the outer peripheral surface of which is provided a tool fastening surface 156.

[0070] A reduced diameter portion having a reduced diameter is provided on the upper side of the seating protrusion 154 in the outer peripheral surface of the main body 151 , and an insertion protrusion 143 inserted into the reduced diameter portion 158 is provided at the lower end of the support member 140 .

[0071] According to the present embodiment having the structure and shape as described above, a vehicle steering device can be provided, which improves the measurement accuracy of the steering angle by accurately measuring the axial displacement change of the actuator rod, can minimize noise and vibration after being subjected to impact and vibration transmitted from the road surface, and can maintain the accuracy of the steering angle measurement, thereby improving durability.

[0072] The above description is merely an illustrative description of the technical concept of the present invention. Anyone skilled in the art of the present invention can make various modifications and variations without departing from the essential characteristics of the technical concept. In addition, since the present embodiment does not limit the technical concept of the present invention but is used for illustration, the scope of the technical concept is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims, and all technical concepts within the scope of equivalence should be interpreted as included within the scope of the rights of the present invention.

Claims

1. A vehicle steering device, characterized in that: include: An actuator rod slides axially and is provided with a fastening hole on one side of the outer circumference of the actuator rod. a rod fastening member having one end coupled to the magnet assembly and the other end coupled to the fastening hole, A rod housing is provided with a rod hole for sliding the actuator rod and a receiving hole communicating with the rod hole is provided on one side of the outer peripheral surface of the rod housing. a pair of supporting members supported and coupled to both inner side surfaces of the accommodating hole so as to slide axially together with the actuator rod, and the pair of supporting members are separately arranged on both radial sides of the rod fastening member, and An elastic member is coupled to an outer peripheral surface of the rod fastening member to elastically support the supporting member.

2. The vehicle steering device according to claim 1, characterized in that: A flat surface portion is provided on one side of an outer peripheral surface of the actuator rod, and the fastening hole is provided in the flat surface portion.

3. The vehicle steering device according to claim 1, characterized in that: The supporting member includes a first supporting member and a second supporting member symmetrically separated and formed, and a coupling protrusion is provided on one of mutually opposing surfaces of the first supporting member and a coupling groove coupled with the coupling protrusion is provided on the other.

4. The vehicle steering device according to claim 1, characterized in that: The supporting member is made of one or more materials selected from the group consisting of polyoxymethylene, polyamide, polycarbonate, polyimide, polybutylene terephthalate, polyphenylene sulfide, and phenolic resin.

5. The vehicle steering device according to claim 4, characterized in that: The support member is formed by mixing 20 wt % to 5 wt % of glass fiber.

6. The vehicle steering device according to claim 5, characterized in that: A coating formed by coating with polytetrafluoroethylene material is provided on the outer side of the supporting member.

7. The vehicle steering device according to claim 1, characterized in that: A concave supporting groove is provided on the outer side surface of the supporting member to support the two inner side surfaces of the accommodating hole.

8. The vehicle steering device according to claim 7, characterized in that: A plurality of support grooves are provided spaced apart from each other.

9. The vehicle steering device according to claim 8, characterized in that: The support groove is filled with lubricant.

10. The vehicle steering device according to claim 2, characterized in that: The rod fastening member comprises: The main body has a placement protrusion on its outer circumference that protrudes in a radial direction and is placed on the flat surface. a threaded fastening portion, disposed on the lower side of the placement protrusion and engaged with the fastening hole, and The head portion is arranged on the upper side of the main body portion, and a tool fastening surface is provided on the outer peripheral surface of the head portion.

11. The vehicle steering device according to claim 10, characterized in that: A reduced diameter portion having a reduced diameter in an outer peripheral surface of the main body is provided on an upper side of the seating protrusion, and an insertion protrusion inserted into the reduced diameter portion is provided at a lower end of the support member.

12. The vehicle steering device according to claim 10, characterized in that: An outer peripheral groove coupled to the elastic member is provided on an outer peripheral surface of the main body.

13. The vehicle steering device according to claim 12, characterized in that: An inner peripheral groove is provided in an inner peripheral surface of the support member at a position opposite to the outer peripheral groove, and the elastic member is inserted into and supported in the inner peripheral groove.

14. A vehicle steering device, characterized in that: include: An actuator rod slides axially and is provided with a fastening hole on one side of the outer circumference of the actuator rod. a rod fastening member having one end coupled to the magnet assembly and the other end coupled to the fastening hole, A rod housing is provided with a rod hole for sliding the actuator rod and a receiving hole communicating with the rod hole is provided on one side of the outer peripheral surface of the rod housing. a pair of supporting members supported and coupled to both inner side surfaces of the accommodating hole so as to slide axially together with the actuator rod, and the pair of supporting members are separately arranged on both radial sides of the rod fastening member, and An elastic supporting member is coupled to the inner peripheral surface of the supporting member to elastically support the rod fastening member.

15. The vehicle steering device according to claim 14, characterized in that: A flat surface portion is provided on one side of an outer peripheral surface of the actuator rod, and the fastening hole is provided in the flat surface portion.

16. The vehicle steering device according to claim 15, characterized in that: The rod fastening member comprises: The main body has a placement protrusion on its outer circumference that protrudes in a radial direction and is placed on the flat surface. a threaded fastening portion, disposed on the lower side of the placement protrusion and engaged with the fastening hole, and The head portion is arranged on the upper side of the main body portion, and a tool fastening surface is provided on the outer peripheral surface of the head portion.

17. The vehicle steering device according to claim 16, characterized in that: A reduced diameter portion having a reduced diameter in an outer peripheral surface of the main body is provided on an upper side of the seating protrusion, and an insertion protrusion inserted into the reduced diameter portion is provided at a lower end of the support member.

18. The vehicle steering device according to claim 16, characterized in that: A fixing groove for inserting the elastic supporting member for fixing is provided on the inner circumferential surface of the supporting member.

19. The vehicle steering device according to claim 14, characterized in that: The supporting member includes a first supporting member and a second supporting member symmetrically separated and formed, and a coupling protrusion is provided on one of mutually opposing surfaces of the first supporting member and a coupling groove coupled with the coupling protrusion is provided on the other.

20. The vehicle steering device according to claim 14, characterized in that: A concave supporting groove is provided on the outer side surface of the supporting member to support the two inner side surfaces of the accommodating hole, and a plurality of the supporting grooves are provided at intervals from each other.

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