VEHICLE STEERING DEVICE AND VEHICLE COMPRISING THE SAME

Abstract

A vehicle steering device includes an input shaft, an output shaft, and a torsion return element. The input shaft includes an insert portion at the lower end, the insert portion having an axially defined space therein, and is coupled to a steering shaft at the upper end to transmit a steering torque. The output shaft is connected to the insert portion at the upper end and to a rack at the lower end to transmit the steering torque to the rack. The torsion return element is coupled between the inner surface of the insert portion and the upper end of the output shaft to elastically deform upon rotation of the input shaft.

Description

CROSS-REFERENCE TO A RELATED APPLICATION

[0001] This application claims priority to Korean Patent Application No. 10-2024-0024630, filed on February 20, 2024, which is hereby incorporated by reference for all purposes as if fully set forth herein. BACKGROUND area

[0002] The embodiments relate to a vehicle steering device and a vehicle with this device. Description of the state of the art

[0003] In a vehicle steering device and a vehicle, a steering shaft includes a lower steering shaft and a connected upper steering shaft. The upper steering shaft is connected to a steering wheel and is configured such that an input shaft of the lower steering shaft is connected to an output shaft coupled to a rack to transmit steering force of the steering wheel.

[0004] One end of the lower steering shaft is connected to the input shaft and coupled to the input shaft and a torsion bar via a bolt.

[0005] The torsion bar is coupled to the input and output shafts within the input and output shafts and acts as a type of torsion spring, rotating and twisting along with the input shaft as the steering shaft rotates. The relative twist between the input and output shafts is measured by a torque sensor and transmitted to an electronic control unit, which in turn generates a control signal to control the generation of auxiliary steering force.

[0006] However, conventional torsion bars with such a structure, which act as torsion springs on steering shafts, suffered from difficulties in manufacturing and machining torsion bars and in assembly, such as attaching pins to the input and output shafts. The need to manufacture torsion bars of different lengths depending on the vehicle type can reduce productivity and increase costs, and there are difficulties in tuning the stiffness of the torsion bars.

[0007] Therefore, there is an increasing need for research into a vehicle steering device that can minimize cost increase and improve assembly capability by replacing and standardizing existing torsion bars. BRIEF SUMMARY

[0008] Various aspects offer a vehicle steering device that can minimize cost increases and improve ease of assembly by replacing and standardizing existing torsion bars.

[0009] According to embodiments, a vehicle steering device is provided, which comprises an input shaft coupled to a steering shaft and an insertion part at one end of the input shaft, wherein the insertion part of the input shaft has an inner space formed in the insertion part in an axial direction of the input shaft, an output shaft, wherein one end of the output shaft is coupled to the insertion part of the input shaft and another end of the output shaft is coupled to a rack, and a torsion return element coupled between the inner surface of the insertion part of the input shaft and the one end of the output shaft and configured to be elastically deformable in response to the rotation of the input shaft.

[0010] According to embodiments, a vehicle steering device is also provided, which includes an input shaft coupled to a steering shaft and an insertion part at one end of the input shaft, the insertion part of the input shaft having an internal space formed in the insertion part in an axial direction of the input shaft, an output shaft, one end of the output shaft coupled to the insertion part of the input shaft and the other end of the output shaft coupled to a rack, a torsion restoring member coupled between the insertion part and one end of the output shaft and coupled to be elastically deformable in response to rotation of the input shaft, and a rotation support member coupled to one end of the output shaft and coupled between an inner surface of the insertion part of the input shaft and the torsion restoring member to assist rotation of the output shaft.

[0011] According to embodiments, a vehicle is also provided, comprising a steering shaft connected to a steering wheel, an input shaft coupled to the steering shaft and having an insert portion at one end of the input shaft, wherein the insert portion of the input shaft has an internal space formed in the insert portion in an axial direction of the input shaft, an output shaft, wherein one end of the output shaft is coupled to the insert portion of the input shaft and at another end of the output shaft is coupled to a rack, a rack drive coupled to the rack and configured to control the movement of the rack, a torsion return element coupled between an inner surface of the insert portion of the output shaft and one end of the output shaft, which torsion return element is coupled to the insert portion of the input shaft and is configured to be elastically deformable in response to the rotation of the input shaft,a torque sensor configured to detect the torque of the input shaft, and an electronic control unit configured to output a control signal to the rack drive in accordance with the torque of the input shaft.

[0012] According to the exemplary embodiment, the replacement and standardization of existing torsion bars can minimize the increase in costs and also improve ease of assembly. DESCRIPTION OF THE DRAWINGS

[0013] The foregoing and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings in which: Fig. 1 is a schematic representation of a vehicle according to embodiments; Fig. 2 is a perspective view showing parts of a vehicle steering apparatus according to embodiments; Fig. 3 and Fig. 4 are exploded perspective views showing parts of the vehicle steering apparatus according to the embodiments; Fig. 5 is a perspective view showing parts of the vehicle steering apparatus according to the embodiments; Fig. 6 and Fig. 7 are exploded perspective views showing parts of the vehicle steering apparatus according to the embodiments; Fig. 8 and Fig. 9 are perspective views illustrating parts of the vehicle steering apparatus according to embodiments; and Fig. 10 to 13 are cross-sectional views showing parts of the vehicle steering apparatus according to the embodiments. DETAILED DESCRIPTION

[0014] In the following description of examples or embodiments of the present disclosure, reference is made to the accompanying drawings, in which, for illustrative purposes, specific examples or embodiments that may be implemented are shown, and in which the same reference numbers and characters may be used to refer to the same or similar components even if they are shown in different accompanying drawings. Furthermore, in the following description of examples or embodiments of the present disclosure, detailed descriptions of known functions and components contained herein have been omitted in some embodiments of the present disclosure when it was determined that the description would be likely to obscure the subject matter.As used herein, terms such as "including," "with," "containing," "consisting of," and "formed of" are generally intended to permit the addition of other components unless the terms are used with the term "only." As used herein, singular forms are intended to include plural forms unless the context clearly indicates otherwise.

[0015] Terms such as "first," "second," "A," "B," "(A)," or "(B)" may be used herein to describe elements of the disclosure. Each of these terms is not intended to define the nature, order, sequence, or number of elements, etc., but only to distinguish the corresponding element from other elements.

[0016] When it is stated that a first element is "connected or coupled," "in contact," or "overlaps," etc., a second element, it is understood that the first element may not only be "directly connected or coupled," "directly in contact," or "directly overlap" the second element, but also that a third element may be "interposed" between the first and second elements, or that the first and second elements may be "connected or coupled," "in contact," or "overlap" each other via a fourth element. Herein, the second element may be included in at least one of two or more elements that are "connected or coupled," "touching or overlapping," etc., to each other.

[0017] When terms indicating a temporal relationship, such as "after," "following," "next," "before," and the like, are used to describe processes or operations of elements or configurations or sequences or steps in methods of operation, processing, or manufacturing, these expressions may be used to describe non-consecutive or non-sequential processes or operations, as long as the term "direct" or "immediate" is not used in connection therewith.

[0018] When specifying any dimensions, relative sizes, etc., it should also be noted that numerical values ​​for any element or characteristic, or corresponding information (e.g., level, area, etc.), include a range of tolerance or error that may be caused by various factors (e.g., process factors, internal or external influences, disturbance, etc.), even if a relevant description is not specific. Furthermore, the term "could" includes all meanings of the term "may."

[0019] Fig. 1 is a schematic view illustrating a vehicle according to embodiments, Fig. 2 is a perspective view illustrating parts of a vehicle steering apparatus according to embodiments, Fig. 3 and Fig. 4 are exploded perspective views illustrating parts of the vehicle steering apparatus according to embodiments, Fig. 5 is a perspective view illustrating parts of the vehicle steering apparatus according to embodiments, Fig. 6 and Fig. 7 are exploded perspective views showing parts of the vehicle steering apparatus according to the embodiments, Fig. 8 and Fig. 9 are perspective views showing parts of the vehicle steering apparatus according to the embodiments, and Fig. 10 to 13 are cross-sectional views showing parts of the vehicle steering apparatus according to the embodiments.

[0020] First, embodiments are described with reference to the Fig. 1 to 5 described.

[0021] According to the present embodiments, a vehicle steering device can be provided, which includes: an input shaft 106 coupled to a steering shaft 102 and having an insertion part 106a at one end of the input shaft 106, wherein the insertion part 106a of the input shaft 106 has an inner space formed in the insertion part 106a in an axial direction of the input shaft 106, an output shaft 108, wherein one end of the output shaft 108 is coupled to the insertion part 106a of the input shaft 106 and another end of the output shaft 108 is coupled to a rack 120, and a torsion return element 210 coupled between an inner surface of the insertion part 106a of the input shaft 106 and one end of the output shaft 108, with the insertion part 106a of the input shaft 106 and is configured to be elastically deformable in response to rotation of the input shaft 106.

[0022] Referring to Fig. 1, the vehicle of the present embodiments is configured such that the steering shaft 102 connected to a steering wheel 101 is coupled to the input shaft 106 via a universal joint 104, and an electronic control unit 111, such as an electronic control unit (ECU), sends a control signal to a motor 113 to steer two wheels 115 via tie rods 119 based on information received from a torque sensor 103 that detects the torque at the input shaft in response to the driver's operation of the steering wheel 101, a steering angle sensor 121, a speed sensor 122, and the like.

[0023] In the present embodiments, the steering shaft 102 is connected at the top to the input shaft 106 at the bottom via the universal joint 104 and enables steering by a rack and pinion device 116 with a pinion 108 and a rack toothing 112.

[0024] The drive force of the motor 113 driven by the electronic control unit 111 is transmitted via the belt 150 to a ball nut 125, thereby axially displacing the rack 120, which is connected to the ball nut 125 via a ball. Tie rods 119 are connected to the opposite ends of the rack 120. The tie rods 119 are connected to the steering knuckles 117, which are connected to the wheels 115 to steer the wheels 115.

[0025] A motor pulley 123 connected to the shaft of the motor 113 and a nut pulley 130 connected to the ball nut 125 are arranged parallel to each other. A belt 150 is connected to the motor pulley 123 and the nut pulley 130 to transmit the rotational force of the motor 113 to the rack 120 via the ball nut 125. The rack 120 can be moved from side to side by the movement of the ball nut 125 to generate a steering assist force.

[0026] An electrical signal generated by the torque sensor 103 is sent to the electronic control unit 111, and the electronic control unit 111 controls the motor 113 based on an electrical signal transmitted from the torque sensor 103 and electrical signals transmitted from the steering angle sensor 121, the speed sensor 122, and the like mounted on the vehicle.

[0027] Referring to Fig. 2, the lower end of the input shaft 106 is provided with the insertion part 106a having an axially defined space therein, and the upper end of the input shaft 106 is provided with a coupling part 106b coupled to the steering shaft 102 to transmit the steering rotation force when the steering shaft 102 rotates.

[0028] The upper end of the output shaft 108 is connected to the insert part 106a of the input shaft 106, and the output shaft 108 is provided with a pinion 108a at the lower end and connected to the rack gear 112 of the rack 120 to transmit the steering torque of the input shaft 106 to the rack 120.

[0029] As in the Fig. 3 and Fig. 4, the torsion restoring element 210 is coupled between the inner surface of the insert part 106a and the upper end of the output shaft 108 to elastically deform and generate an elastic restoring force upon rotation of the drive shaft 106.

[0030] Referring to Fig. 5, the torsion return element 210 includes a fixed housing 200 fixed to the insert part 106a, and elastic members 220a and 220b each having a first end and a second end supporting the output shaft 108, wherein a portion of the elastic member 220a between the first and second ends of the elastic member 220a is fixed to the fixed housing 200 of the torsion return element 210.

[0031] As in Fig. 4, the output shaft 108 is provided with an axially projecting bearing end 223 projecting from one end of the output shaft 108 coupled to the insert portion 106a of the input shaft 106, and the bearing end 223 is provided with stop surfaces 223a and 223b formed as cut planes on the radially opposite sides of the bearing end 223.

[0032] In addition, the insert part 106a is provided with a support surface 203 on the inner peripheral surface of the end of the input shaft 106, wherein the stop surfaces 223a and 223b of the output shaft 108 are supported on the support surface 203 when the input shaft 106 rotates.

[0033] The stop surfaces 223a and 223b are designed such that the first stop surface 223a and the second stop surface 223b are connected at an angle. The first stop surface 223a is supported and stopped on the support surface 203 when the input shaft 106 rotates clockwise, and the second stop surface 223b is supported and stopped on the support surface 203 when the input shaft 106 rotates counterclockwise.

[0034] Furthermore, the output shaft 108 is provided at its upper end with protruding ends 221 that project axially from the bearing end 223 and bear on the first and second ends of the elastic elements 220a and 220b. Upon rotation of the input shaft 106, the protruding ends 221 bear against the first and second ends of the elastic elements 220a and 220b, causing elastic deformation.

[0035] The projecting ends 221 are provided as a plane whose opposite sides are parallel to each other in the radial direction about the central axis.

[0036] Furthermore, the elastic members 220a and 220b are provided as a pair of elastic members symmetrically arranged on the opposite sides of the protruding ends 221, so that the elastic restoring force generated on the elastic members 220a and 220b by the protruding ends 221 upon rotation of the input shaft 106 acts uniformly on the opposite sides of the protruding ends 221.

[0037] Again referring to Fig. 5 in conjunction with the Fig. 3 and Fig. 4, the fixed housing 200 includes a cylindrical part 213 connected to the inner peripheral surface of the insertion part 106a, a vertical partition wall 215 extending from a first end of the cylindrical part 213, and fixing projections 217 each axially projecting from the vertical partition wall 215 such that a portion between a first end and a second end of each of the elastic members 220a and 220b is connected to one of the fixing projections 217.

[0038] The cylindrical part 213 is provided with radially projecting support projections 211 projecting from the outer peripheral surface, and the insert part 106a is provided on the inner peripheral surface with seating recesses 201 into which the support projections 211 are inserted, so that the fixed housing 200 is fixed to the inner peripheral surface of the insert part 106a without idling.

[0039] The fastening projections 217 are spaced from the inner peripheral surface of the cylindrical part 213, and the regions between the first and second ends of the elastic members 220a and 220b are arranged between the inner peripheral surface of the cylindrical part 213 and the fastening projections 217.

[0040] One of the fastening projections 217 has a flat surface 217a provided as a plane at a position opposite the inner peripheral surface of the cylindrical part 213. The cylindrical part 213 is provided with a flat surface 213a on the inner peripheral surface, the flat surface 213a of the cylindrical part 213 being parallel to the flat surface 217a of the fastening projections 217.

[0041] In addition, one of the fixing projections 217 includes inclined portions 217b extending radially from the ends of the flat surface 217a facing the inner peripheral surface of the cylindrical part 213.

[0042] Each elastic member 220a or 220b includes shaft support members 222-1a and 222-2a or 222-1b and 222-2b each having first and second ends disposed on both sides in the same plane to support the outer peripheral portions of the output shaft 108, and fixing projections 221a and 221b bent at the inner ends of the shaft support members 222-1a and 222-2a or 222-1b and 222-2b to wrap around and fix the inclined portions 217b and the flat surface 217a of the fixing projection 217.

[0043] Referring to Fig. 6 to 13, the vehicle steering device according to the present embodiments comprises: an input shaft 106 coupled to a steering shaft 102 and having an insertion part 106a at one end of the input shaft 106, wherein the insertion part 106a has an inner space formed in the insertion part 106a in an axial direction, an output shaft 108, wherein one end of the output shaft 108 is coupled to the insertion part 106a and another end of the output shaft is coupled to a rack 120, a torsion return element 210 coupled between an inner surface of the insertion part 106a and one end of the output shaft 108 and configured to be elastically deformable in response to rotation of the input shaft 106, and a first rotation support member 250 connected to one end of the output shaft 108 is coupled and is coupled between the inner surface of the insert part 106a and the torsion return element 210,to support the rotation of the output shaft 108.,

[0044] Here, the torsion return element 210 comprises a fixed housing 200 fixed to the insert part 106a, and elastic elements 220a and 220b, each having a first and a second end, which support the output shaft 108, wherein a portion of the elastic element 220a and 220b between the first and second ends is fixed to the fixed housing 200. These features are the same as those described above and will therefore not be described in detail below.

[0045] With reference to the Fig. 6 and Fig. 7, the upper end of the output shaft 108 is provided with projecting ends 221 which project axially and are supported on the first and second ends of the elastic members 220a and 220b, each of the projecting ends 221 being arranged such that the opposite sides of the projecting ends 221 of the output shaft 108 are parallel to each other in the radial direction about the central axis.

[0046] In addition, the upper end of the output shaft 108 is provided with a coupling projection 225 axially projecting from the projecting ends 221 to be coupled to the first rotation support member 250.

[0047] With reference to the Fig. 8 to 10, the first rotation support member 250 includes an annular inner coupling member 253 coupled to the coupling projection 225 to rotate together with the output shaft 108, an annular outer coupling member 251 axially supported by the fixed housing 200 of the torsion return member 210 and radially supported by and fixed to the inner peripheral surface of the insert part 106a, and a first rolling element 255 coupled between the inner coupling member 253 and the outer coupling member 251 to assist the rotation of the inner coupling member 253.

[0048] In one embodiment, the first rolling element 255 may be designed as a ball, and the inner peripheral surface of the insert part 106a is provided with a coupling surface 202 to which the first rolling element 255 is coupled.

[0049] The present embodiments may further include a second rotation support member 260 coupled between the inner surface 204 of the insert portion 106a and the first rotation support member 250 to assist in the rotation of the inner coupling member 253.

[0050] The second rotation support member 260 may include a support member 261 supporting the inner surface 204 of the insert portion 106a and the inner coupling member 253, and second roller members 263 rotatably coupled to the support member 261 to assist the rotation of the inner coupling member 253.

[0051] In one embodiment, the second rolling elements 263 may be designed as rollers, and the inner surface 204 on which the second rolling elements 263 are mounted may be designed as a stepped part with a decreasing inner diameter.

[0052] In one embodiment, an assembly operation may be performed by the sequence of attaching the second rolling elements 263 to the inner surface 204 of the male part 106a, sliding the first rolling element 255 onto the inner peripheral surface of the male part 106a for attachment to the mating surface 202, and then attaching the torsion return element 210 and the output shaft 108 to the input shaft 106.

[0053] With reference to the Fig. 11 to 13, the operation of the torsion return element is described as follows.

[0054] Fig. 11 first shows the steering wheel in a neutral state, that is, in a state in which the driver does not operate the steering wheel and the vehicle is traveling straight, with the opposite sides of the projecting ends 221 evenly resting on the elastic members 220a and 220b.

[0055] Fig. 12 shows a state in which the steering wheel is operated to rotate the projecting ends 221 counterclockwise, wherein a first end 222-1a of the left elastic member 220a and a second end 222-2b of the right elastic member 220b are compressed, thereby exerting an elastic restoring force on the projecting ends 221.

[0056] As opposed to Fig. 12 shows Fig. 13 shows a state in which the protruding ends 221 are rotated clockwise. At this time, the second end 222-2a of the left elastic member 220a and the first end 222-1b of the right elastic member 220b are pressed together, thereby exerting an elastic restoring force on the protruding ends 221.

[0057] Furthermore, with reference to the Fig. 2 to 13 together with Fig. 1, a vehicle according to the present embodiments, a steering shaft 102 connected to a steering wheel 101, an input shaft 106 coupled to the steering shaft 102 and including an insertion part 106a at one end of the input shaft 106, wherein the insertion part 106a has an inner space formed in the insertion part 106a in an axial direction of the input shaft 106, an output shaft 108, wherein one end of the output shaft 108 is coupled to the insertion part 106a and another end of the output shaft is coupled to a rack 120, a rack drive 113, 123, 150, 130 and 125 coupled to the rack 120 and configured to control the movement of the rack 120, a torsion return element 210 arranged between the Inner surface of the insert part 106a and one end of the output shaft 108, which is coupled to the insert part 106a and is arranged,to be elastically deformable in response to the rotation of the input shaft 106, a torque sensor 103 configured to detect the torque of the input shaft 106, and an electronic control unit 111 configured to output control signals to the rack drive in accordance with the torque of the input shaft 106.

[0058] The steering shaft 102, the input shaft 106, the output shaft 108 and the torsion return element 210 are the same as described above and will not be explained in detail below.

[0059] As in Fig.1, the rack and pinion drive 113, 123, 150, 130, and 125 coupled to the rack 120 to translate the rack 120 may include a motor 113 configured to be driven in response to a control signal from the electronic control unit 111, a motor pulley 123 coupled to the motor 113, a nut pulley 130 coupled to a ball nut 125 coupled to the rack 120, and a belt 150 connecting the motor pulley 123 and the nut pulley 130.

[0060] The torque sensor 103 is connected to a first side of the input shaft 106 and is configured to detect the driver's operation of the steering wheel 101 and send an electrical signal to the electronic control unit 111 to operate the motor 113.

[0061] The electronic control unit 111 controls the motor 113 based on an electrical signal transmitted from the torque sensor 103 and electrical signals transmitted from the steering angle sensor 121, the speed sensor 122, and the like mounted on the vehicle.

[0062] The motor 113 may be coupled to a reduction gear to reduce the speed of the motor and may drive the rack 120 back and forth via a belt 150 and a nut pulley 130 to steer both wheels 115 via tie rods 119 and steering knuckle arms 117.

[0063] In the drawings of the present embodiments, the torque sensor 103 mounted on the input shaft 106, the speed sensor 122 that transmits steering information to the electronic control unit 190, and the steering angle sensor 121 are shown by way of example for the sake of brevity, but other devices such as an ultrasonic sensor, an image sensor, an engine position sensor, and various radar and LiDAR devices may be provided, so that detailed descriptions thereof are omitted.

[0064] According to embodiments of the present invention having the shapes and structures described above, both the cost increase and the ease of assembly can be minimized by replacing and unifying existing torsion bars.

[0065] The above description is presented to enable a person skilled in the art to implement and utilize the technical spirit of the present disclosure and is provided in the context of a specific application and its requirements. Various modifications, additions, and substitutions to the described embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. The above description and the accompanying drawings provide an example of the technical spirit of the present disclosure for illustrative purposes only. That is, the disclosed embodiments are intended to illustrate the scope of the technical spirit of the present disclosure.Thus, the scope of the present disclosure is not limited to the illustrated embodiments, but must be consistent with the broadest scope still consistent with the claims. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] KR 10-2024-0024630

[0001]

Claims

[1] Vehicle steering device, comprising: an input shaft (106) coupled to a steering shaft (102) and having an insertion part (106a) at one end of the input shaft (106), the insertion part (106a) of the input shaft (106) having an inner space formed in the insertion part (106a) in an axial direction of the input shaft (106); an output shaft (108), one end of the output shaft (108) being coupled to the insert part (106a) of the input shaft (106) and another end of the output shaft (108) being coupled to a rack (120); and a torsion return element (210) coupled between an inner surface of the insert part (106a) of the input shaft (106) and one end of the output shaft (108) coupled to the insert part (106a) of the input shaft (106), and configured to be elastically deformable in response to the rotation of the input shaft (106). [2] A vehicle steering device according to claim 1, wherein the torsion return element (210) comprises: a fixed housing (200) fixed to the insert part (106a) of the input shaft (106); and at least one elastic element (220a, 220b) having a first end and a second end supporting the output shaft (108), wherein a portion of the elastic element (220a, 220b) between the first and second ends of the elastic element (220a, 220b) is fixed to the fixed housing (200) of the torsion return element (210). [3] A vehicle steering device according to claim 1 or 2, wherein the output shaft (108) comprises: an axially projecting bearing end (223) projecting from one end of the output shaft (108) which is coupled to the insert part (106a) of the input shaft (106), and Stop surfaces (223a, 223b) on the sides of the axially projecting bearing end (223) of the output shaft (108). [4] A vehicle steering device according to claim 3, wherein the insertion part (106a) of the input shaft (106) has a support surface (203) on an inner peripheral surface of the end of the input shaft (106), wherein the stop surfaces (223a, 223b) of the output shaft (108) are supported by the support surface (203) of the insertion part (106a) of the input shaft (106). [5] A vehicle steering device according to claim 3 or 4, wherein the output shaft (108) has a projecting end (221) axially projecting from the axially projecting bearing end (223) of the output shaft (108) and supported by the first and second ends of the at least one elastic member (220a, 220b) of the torsion return member (210). [6] Vehicle steering device according to one of claims 2 to 5, wherein the fixed housing (200) of the torsion return element (210) comprises: a cylindrical part (213) connected to the inner surface of the male part (106a) of the input shaft (106); a vertical partition extending from a first end of the cylindrical portion (213); and Fastening projections (217) each projecting axially from the vertical partition wall (215) such that the portion of the elastic element (220a, 220b) between the first end and the second end of the elastic element (220a, 220b) is connected to one of the fastening projections (217). [7] A vehicle steering device according to claim 6, wherein the cylindrical part (213) of the fixed housing (200) of the torsion return element (210) has radially projecting support projections (211) projecting from an outer peripheral surface of the cylindrical part (213), and the insertion part (106a) of the input shaft (106) has seating recesses (201) on the inner surface of the insertion part (106a), the radially projecting support projections (211) being inserted into the seating recesses (201) of the insertion part (106a) of the input shaft (106). [8] Vehicle steering device, comprising: an input shaft (106) coupled to a steering shaft (102) and including an insertion part (106a) at one end of the input shaft (106), the insertion part (106a) of the input shaft (106) having an inner space formed in the insertion part (106a) in an axial direction of the input shaft (106); an output shaft (108), one end of the output shaft (108) being coupled to the insert part (106a) of the input shaft (106) and another end of the output shaft (108) being coupled to a rack (120); a torsion return element (210) coupled between an insert part (106a) and one end of the output shaft (108), which is coupled to the insert part (106a) of the input shaft (106), and is configured to be elastically deformable in response to the rotation of the input shaft (106); and a rotation support member (250) coupled to one end of the output shaft (108) and coupled between an inner surface of the insert portion (106a) of the input shaft (106) and the torsion return member (210) to assist the rotation of the output shaft (108). [9] A vehicle steering device according to claim 8, wherein the torsion return element (210) comprises: a fixed housing (200) fixed to the insert part (106a) of the input shaft (106); and an elastic member (220a, 220b) having a first end and a second end supporting the output shaft (108), wherein a portion of the elastic member (220a, 220b) between the first and second ends is fixed to the fixed housing (200) of the torsion return element (210). [10] A vehicle steering device according to claim 8 or 9, wherein the output shaft (108) has a projecting end (221) projecting axially from one end of the output shaft (108) and supported by the first and second ends of the elastic member (220a, 220b) of the torsion return member (210), opposite sides of the projecting end (221) of the output shaft (108) being parallel to each other in a radial direction. [11] The vehicle steering apparatus according to claim 10, wherein the output shaft (108) has a coupling projection (225) at one end of the output shaft (108) which projects axially from the projecting end (221) of the output shaft (108) to be coupled to the rotation support member (250). [12] A vehicle steering device according to claim 11, wherein the rotation support member (250) comprises: an inner coupling element (253) coupled to the coupling projection (225) of the output shaft (108) to rotate together with the output shaft (108); an annular outer coupling element (251) axially supported by the fixed housing (200) of the torsion return element (210) and radially supported by and fixed to an inner peripheral surface of the insert part (106a) of the input shaft (106); an outer coupling element axially supported by the fixed housing (200) and radially supported by and fixed to the inner peripheral surface of the insert part (106a) of the input shaft (106); and a first rolling element (255) coupled between the inner coupling element (253) and the outer coupling element (251) to assist the rotation of the inner coupling element (253). [13] A vehicle steering device according to claim 12, further comprising another rotation support member (260) coupled between the inner surface (204) of the insert part (106a) of the input shaft (106) and the rotation support member (250) to assist the rotation of the inner coupling member (253). [14] Vehicle comprising: a steering shaft (102) connected to a steering wheel; an input shaft (106) coupled to the steering shaft (102) and including an insertion part (106a) at one end of the input shaft (106), the insertion part (106a) of the input shaft (106) having an inner space formed in the insertion part (106a) in an axial direction of the input shaft (106); an output shaft (108), one end of the output shaft (108) being coupled to the insert part (106a) of the input shaft (106) and another end of the output shaft (108) being coupled to a rack (120); a rack drive (113, 123, 150, 130, 125) coupled to the rack (120) and arranged to control the movement of the rack (120); a torsion return element (210) coupled between an inner surface of the insert part (106a) of the output shaft (108) and one end of the output shaft (108), coupled to the insert part (106a) of the input shaft (106) and configured to be elastically deformable in response to the rotation of the input shaft (106); a torque sensor (103) configured to detect the torque of the input shaft (106); and an electronic control unit (111) configured to output a control signal to the rack drive (113, 123, 150, 130, 125) in accordance with the torque of the input shaft (106). [15] Vehicle according to claim 14, wherein the rack drive (113, 123, 150, 130, 125) comprises: a motor (113) arranged to be driven in response to the control signal of the electronic control unit (111); a motor pulley (123) coupled to the motor (113); a nut pulley (130) connected to a ball nut (125) coupled to the rack (120); and a belt (150) connecting the motor pulley (123) and the mother pulley (130).

Images