Rack and pinion support device for a steering system of vehicles

Abstract

Rack and pinion support device of a steering system for a vehicle, which has: a support yoke (301) configured to be inserted into a cylinder (250) of a gearbox (130) to support a rack (140); a first cam part (310) configured to have a front surface supporting the support yoke (301) towards the rack (140), and a rear surface provided with a first cam surface (313) inclined in a circumferential direction thereof; a second cam part (320) configured to have a front surface provided with a second cam surface (317), which is inclined in a circumferential direction to correspond to the first cam surface (313), to have a rear surface, on which one end of a torsion spring (321) is supported and coupled, and has an outer circumferential surface which is provided with an outer circumferential groove (319) formed in an axial direction thereof; a yoke plug (325) configured to have an inner front surface on which the other end of the torsion spring (321) is supported and coupled to be coupled to the cylinder (250), and to be provided with an insert hole (325a) connected to the outer circumferential groove (319); and an elastic pin (330) configured to be inserted into the outer circumferential groove (319) and the insert hole (325a) so that the torsion spring (321) is held in a tensioned state, characterized in that the elastic pin (330) is provided with an elastic damping element (330b) between pin parts (330a, 330c) which are arranged on both sides of it in a radial direction, in order to be elastically deformable in the radial direction.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention

[0001] The present disclosure relates to a rack and pinion support device for a steering system for a vehicle. More precisely, in a rack and pinion steering system of a rack and pinion type for a vehicle, the present disclosure relates to a rack and pinion support device for a steering system for a vehicle that can prevent noise generated by an increase in play due to wear of a support yoke, or conversely by the shock introduced from the road surface, in order to provide the driver with a comfortable steering feel during steering, and which can shorten the assembly process and prevent incorrect assembly and loss of any component while each component is being installed in a vehicle. 2. Description of the state of the art

[0002] In general, a steering device is a device for changing the direction of travel of a vehicle according to the will of the driver, and assists the driver in steering the vehicle in the desired direction by arbitrarily changing the center of rotation of the front wheels of a vehicle.

[0003] However, such a conventional rack and pinion support device has problems in that it cannot properly support a rack because the play is increased due to wear of a support yoke and the rack, and a rattling noise is generated in the support yoke and a yoke plug due to the magnification of the mirror.

[0004] Additionally, since components to support the rack must be mounted one after the other, the assembly process becomes more complex while the components are being assembled in a vehicle, and components can be lost during incorrect assembly or transport of any component.

[0005] From US patent 2009 / 0223314A1, a rack and pinion support device of a steering system for a vehicle is known, comprising a support yoke configured to be inserted into a cylinder of a transmission to support a rack; a first cam section configured to have a front surface supporting the support yoke towards the rack and a rear surface provided with a first cam surface inclined in a circumferential direction thereto; a second cam section configured to have a front surface provided with a second cam surface inclined in a circumferential direction thereto to correspond to the first cam surface; a rear surface on which an end of a torsion spring is supported and coupled; and an outer circumferential surface provided with an outer circumferential groove formed in an axial direction thereto; and a yoke plug.which is configured to have an inner front surface on which the other end of the torsion spring is supported and coupled to be coupled to the cylinder, and is provided with an insert hole connected to the outer circumferential groove, and comprises an elastic pin configured to be inserted into the outer circumferential groove and the insert hole so that the torsion spring is held in a tensioned state. Further relevant devices are known from KR 10 1 415 434 B1 and US 2014 / 0 260 719 A1. SUMMARY OF THE INVENTION

[0006] Against this background, one aspect of the present disclosure is to provide a steering device for a vehicle which can prevent noises generated by an increase in play due to wear of a support yoke or by the shock, conversely, introduced by the road surface, thereby providing the driver with a pleasant steering feel while steering.

[0007] Another aspect of the present disclosure is to provide a steering device for a vehicle that can shorten an assembly process and prevent incorrect assembly and loss of any component while each component is being assembled into a vehicle.

[0008] Furthermore, the aspects of the present embodiments are not limited to this, and other aspects not mentioned can be clearly understood by the person skilled in the art based on the following description.

[0009] According to one aspect of the present disclosure, a rack support device of a steering device for a vehicle comprises: a support yoke configured to be inserted into a cylinder of a transmission to support a rack; a first cam part configured to have a front surface supporting the support yoke towards the rack, and a rear surface provided with a first cam face inclined in a circumferential direction thereto; a second cam part configured to have a front surface provided with a second cam face inclined in a circumferential direction thereto to correspond to the first cam face, a rear surface on which an end of a torsion spring is supported and coupled, and an outer circumferential surface provided with an outer circumferential groove formed in an axial direction thereto;a yoke plug configured to have an inner front surface on which the other end of the torsion spring is supported and coupled to the cylinder and to have an insert hole communicating with the outer circumferential groove; and an elastic pin configured to be inserted into the outer circumferential groove and insert hole to hold the torsion spring in a compressed state.

[0010] As described above, in the embodiments of the present disclosure it is possible to prevent noises generated by an increase in play due to wear of a support yoke or by the shock, conversely, introduced by the road surface, thereby providing a pleasant steering feel to the driver while steering.

[0011] Furthermore, in the embodiments described in the present disclosure, it is possible to shorten the assembly process and prevent incorrect assembly and loss of each component while each component is being assembled in a vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The aforementioned and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description, which is given in conjunction with the accompanying drawings, in which: Fig. 1 is a schematic configuration diagram showing a rack and pinion steering device for a vehicle according to embodiments of the present disclosure; Fig. 2 to 5 separated perspective views are showing part of a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure; Fig. 6 is a cross-sectional view showing part of a rack support device of a steering device for a vehicle according to embodiments of the present disclosure; Fig. Figures 7 to 9 are perspective views showing a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure; Fig. 10 is a cross-sectional view showing a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure; Fig. 11 is a perspective view showing a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure; and Fig. 12 is an expanded perspective view showing a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure. DETAILED DESCRIPTION OF THE EXECUTION EXAMPLES

[0013] Exemplary embodiments are described in detail below with reference to the accompanying drawings. When adding reference numerals to elements in each drawing, the same elements are designated by the same reference numerals whenever possible, even if they are shown in different drawings. Furthermore, in the following description of the present disclosure, a detailed description of known functions and configurations contained herein is omitted if doing so might impair the clarity of the subject matter of the present disclosure.

[0014] Additionally, terms such as first, second, A, B, (a), (b), or the like may be used here when describing components of the present disclosure. These terms are used merely to distinguish one structural element from another, and a property, order, sequence, and the like of a corresponding structural element are not limited by the term. It should be noted that if the description states that one component is "connected," "coupled," or "united" with another component, a third component may be "connected," "coupled," and "united" between the first and second components, even though the first component may be directly connected, coupled, or united with the second component.

[0015] Fig. Figure 1 is a schematic configuration diagram showing a rack and pinion steering device for a vehicle according to embodiments of the present disclosure, Fig. Figures 2 to 5 are separated perspective views showing part of a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure; Fig. Figure 6 is a cross-sectional view showing part of a rack support device of a steering device for a vehicle according to embodiments of the present disclosure, Fig. Figures 7 to 9 are perspective views showing a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure. Fig. Figure 10 is a cross-sectional view showing a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure, Fig. Figure 11 is a perspective view showing a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure, and Fig. Figure 12 is an expanded perspective view showing a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure.

[0016] As shown in these drawings, a rack and pinion steering device for a vehicle according to embodiments of the present disclosure includes a steering wheel 100 arranged in front of a driver's seat, a steering shaft 105 connected to the steering wheel 100, a steering column 103 to enable the steering shaft to be attached to a vehicle body, a transmission 130 comprising a rod toothing 110 and a pinion toothing 120 for converting a rotational force received from the steering shaft 105 into a linear motion, a rack 140 with internal joint connections 135 at its two ends, and a tie rod 150 formed integrally with the balls of the internal joint connection 135.

[0017] The tie rod 150 is connected to an outer joint 155 and transmits a force to a toggle lever 159 to steer a wheel 158.

[0018] Additionally, a rack and pinion steering device for a vehicle according to the embodiments of the present disclosure includes a support yoke 301 configured to be inserted into a cylinder 250 of the transmission 130 to support the rack 140; a first cam part 310 configured to have a front surface supporting the support yoke 301 towards the rack 140, and a rear surface provided with a first cam surface 313 inclined in a circumferential direction thereto;a second cam part 320 configured to have a front surface provided with a second cam surface 317 inclined in a circumferential direction thereto to correspond to the first cam surface 313, to have a rear surface on which one end of a torsion spring 321 is supported and coupled, and to have an outer circumferential surface provided with an outer circumferential groove 319 formed in an axial direction thereto; a yoke plug 325 configured to have an inner front surface on which the other end of the torsion spring 321 is supported and coupled to be coupled to the cylinder 250 and to be provided with an insert hole 325a communicating with the outer circumferential groove 319; and an elastic pin 330 configured to be inserted into the outer circumferential groove 319 and the insert hole 325a, so that the torsion spring 321 is held in a compressed state.

[0019] During operation of the steering device for a vehicle, when a driver operates the steering wheel 100, the steering shaft 105 connected to the steering wheel 100 is rotated, and the pinion gear 120 connected to the lower end of the steering shaft drives the rack 140.

[0020] In the detailed description of the embodiments, for the sake of clarity, the direction of the rack 140, which is the front side of the support yoke 301, is referred to as forward, and the opposite direction is referred to as backward, unless otherwise specified.

[0021] Here, the rack 140 engages with the pinion teeth 120 to convert a rotary motion of the steering shaft 105 into a linear motion. A rack support device is arranged on the rear surface of the rack 140 to support the rack 140 in the direction of the pinion teeth 120, ensuring that the rack 140 and the pinion teeth 120 are properly engaged.

[0022] The rack support device in the present embodiments comprises the support yoke 301, the first cam part 310, the second cam part 320, the yoke plug 325, and the like. The first cam part 310 and the second cam part 320, which are provided with the first cam surface 313 and the second cam surface 317 respectively, formed from corresponding inclined surfaces, support the support yoke 301 towards the rack 140 by means of the torsion spring 321.

[0023] The support yoke 301 is connected to the cylinder 250 of the transmission 130, while it supports the rear surface of the rack 140 via a yoke seat (not shown) located on the front surface of the support yoke 301. The support yoke 301 has an outer circumferential surface to which an elastic ring 303 is coupled, thereby preventing shocks and rattling noises transmitted from the road surface via the rack 140 during vibration.

[0024] Here it is required that the elastic ring 303 consists of a material that has a predetermined bending, elasticity and stiffness and is able to absorb vibrations and noise, and therefore consists of an elastic material with the aforementioned properties such as rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene propylene terpolymer (EPDM), fluorocarbon rubber (FPM), styrene butadiene rubber (SBR), chlorosulfonated polyethylene (CSM), urethane, silicone and the like.

[0025] The first cam section 310, located on the rear side of the support yoke 301 and inserted into the cylinder 250 of the transmission 130, is configured such that its front surface supports the support yoke 301 towards the rack 140, and its rear surface is provided with the first cam surface 313, which is inclined in the circumferential direction. The second cam section 320, located on a rear side of the first cam section 310, includes the second cam surface 317, which is located on a front surface of the first cam section 310 and is inclined in the circumferential direction to correspond to the first cam surface 313 of the first cam section 310.

[0026] A first engagement area 322, to which one end of the torsion spring 321 is supported and coupled, is arranged on the rear surface of the second cam part 320, and the outer circumferential groove 319 formed in the axial direction is arranged in the outer circumferential surface of the second cam part 320.

[0027] The yoke plug 325, to which the second cam part 320 is attached, is provided with a second engagement area 329, which is formed on an inner front surface of this and to which the other end of the torsion spring 321 is supported and coupled, and the second engagement area 329 is coupled to the cylinder 250 of the transmission 130.

[0028] Additionally, the yoke plug 325 is provided with the insert hole 325a, which communicates with the outer circumferential groove 319 of the second cam part 320, and the elastic pin 330 is coupled to the outer circumferential groove 319 of the second cam part 320 and the insert hole 325a in such a way that the torsion spring 321 is held in a tensioned state.

[0029] A guide projection 327, formed in the axial direction, is arranged on an inner surface of the end of the yoke plug 325, and a guide groove 312, inserted into the guide projection 327, is arranged in the outer circumferential surface of the first cam part 310. Accordingly, when the second cam part 320 is rotated by the torsion spring 321 to move the first cam part 310 forward, the first cam part 310 moves while supported by the guide projection 327. However, the present disclosure is not limited to this. For example, the guide groove 312 can be formed in the yoke plug 325, and the guide projection 327 can be formed in the first cam part 310.

[0030] The second cam part 320, the torsion spring 321 and the yoke plug 325 are integrally coupled by the elastic pin 330, which is coupled to the outer circumferential groove 319 of the second cam part 320 and the insert hole 325a of the yoke plug 325 to form a first module 350.

[0031] Accordingly, assembly and transport can be carried out in units of the first module 350, in which the torsion spring 321 is coupled with the second cam part 320 and the yoke plug 325, thereby shortening the assembly process and preventing incorrect assembly or loss of any component.

[0032] Additionally, an elastic part 309 can be arranged on the front surface of the first cam section 310 for elastically supporting the support yoke 301. The elastic part 309 can be formed in a ring shape, conically extending from an inner diameter region to an outer diameter region, and can be elastically deformed in the axial direction to provide an elastic force.

[0033] The elastic part 309 elastically supports the support yoke 301 while damping shocks and vibrations transmitted from the road surface to the pinion and rack 140. Here, the elastic part 309 has a ring shape, inclined axially from the inner diameter region to the outer diameter region, so that it is deformed in the axial direction in which it supports the support yoke 301. The elastic part 309 is made of a metallic metal such as steel, as it is required to be made of a material with predetermined bending, elasticity, and stiffness, and capable of absorbing vibrations and noise.

[0034] Additionally, the elastic part 309 can be made of engineering plastic materials such as polyacetal (POM), polyamide (PA), polycarbonate (PC), polyimide (PI), polybutylene terephthalate (PBT) or the like, to dampen shocks and vibrations like the aforementioned metallic materials.

[0035] A support element 307 can be arranged on the front surface of the elastic element 309 to support it. Coupling holes 307a and 311 are located in central regions of the support element 307 and the first cam element 310, respectively, such that a coupling element 305 is connected to the coupling holes 307a and 311. Consequently, the first cam element 310, the elastic element 309, and the support element 307 are integrally coupled to form a second module 340.

[0036] Accordingly, assembly and transport can be carried out in units of the second module 340, in which the elastic part 309 is coupled between the first cam part 310 and the support part 307, thereby shortening the assembly process and preventing incorrect assembly or loss of any component.

[0037] An insertion groove 301a, into which a head region 305a of the coupling part 305 is inserted, is arranged on the rear surface of the support yoke 301, so that the elastic part 309 can elastically support the support yoke 301 by means of the support part 307, while maintaining the assembly state of the second module 340.

[0038] The first cam section 310 can be provided with a connecting hole 313a, which is connected to the outer circumferential groove 319 of the second cam section 320, passing through its front and rear surfaces. The elastic pin 330 is coupled to the insert hole 325a of the yoke plug 325, the outer circumferential groove 319 of the second cam section 320, and the connecting hole 313a of the first cam section 310, so that the first module 350 and the second module 340 can be combined.

[0039] This means that assembly or transport can be carried out in units consisting of the first module 350, the second module 340, and the support yoke 301. Alternatively, assembly or transport can be carried out in the state where the first module 350 and the second module 340 are coupled together using the elastic pin 330.

[0040] Here, the elastic pin 330 is provided with an elastic damping element 330b between pin parts 330a and 330c, which are arranged on both sides in the radial direction so that they are elastically deformable in the radial direction, so that when the damping element 330b is inserted into the insertion hole 325a of the yoke plug 325 and the connecting hole 313a of the first cam part 310, the damping element 330b is compressed and coupled in the radial direction.

[0041] Accordingly, it is possible to prevent the first module 350 and the second module 340 from separating and being lost during transport or assembly due to the elastic recovery force of the elastic pin 330. In this way, when the first module 350 and the second module 340 are assembled in a combined state with the cylinder 250 of the gearbox 130, assembly is facilitated and the process is shortened.

[0042] Such an elastic pin 330 can be separated after the first module 350 and the second module 340 have been mounted on the gearbox 130 and then separated, or after the support yoke 301 has worn to a certain degree.

[0043] This means that if the play increases due to wear of the support yoke 301, the torsion spring 321 pushes the first cam section 310 towards the rack 140 to compensate for the play. Before the play develops due to wear, the elastic pin 330 can be held in a fixed position so that the torsion spring 321 does not loosen. Accordingly, an operator can remove the elastic pin 330 immediately after assembly or remove it after a certain amount of wear has occurred to compensate for the play between the support yoke 301 and the rack 140.

[0044] The yoke plug 325 is screwed and fixed to the cylinder 250 of the gearbox 130, with a locking nut (not shown) outside the gearbox 130 preventing the screw connection from loosening.

[0045] Such a rack and pinion support device forms the steering device for a vehicle, together with the steering shaft and the pinion gearing (see 120 in Fig. 2), which is connected to the steering shaft, the gearbox 130 for receiving the rack 140, which is provided with the rod teeth which engage with the pinion teeth, and the like.

[0046] In such exemplary embodiments, as described in the Fig. 11 and Fig. As shown in Figure 12, a through hole 319a is formed in the second cam part 320, and the elastic pin 330 can be coupled to the through hole 319a.

[0047] In this case, a rack and pinion support device of a steering device for a vehicle according to embodiments of the present disclosure comprises the support yoke 301, which is configured to be inserted into the cylinder 250 of the transmission 130 to support the rack 140; the first cam part 310, which is configured to have a front surface that supports the support yoke 301 towards the rack 140, and to have a rear surface provided with the first cam surface 313, which is inclined in a circumferential direction thereto; the second cam part 320, which is configured to have a front surface provided with the second cam surface 317, which is inclined in a circumferential direction thereto to correspond to the first cam surface 113; a rear surface with which one end of the torsion spring 321 is supported and coupled; and the through-hole 319a.that passes through the front surface and the rear surface; the yoke plug 325, which is configured to have an inner front surface on which the other end of the torsion spring 321 is supported and coupled to be coupled to the cylinder 250, and is provided with the insert hole 325a, which is connected to the outer circumferential groove 319; and the elastic pin 330, which is configured to be inserted into the through hole 319a and the insert hole 325a, so that the torsion spring 321 is held in a tensioned state.

[0048] Since the support yoke 301, the first cam part 310, the yoke plug 325, and the like are the same as those described above, a detailed description of them is omitted. The second cam part 320 is provided with the through hole 319a, as shown in the Fig. 11 and Fig. 12 is shown, instead of the one in the Fig.2 to 8 shown outer circumferential groove 319, so that the elastic pin 330 can be coupled to the connecting hole 313a of the first cam part 310 in a state in which it is coupled to the through hole 319a, and the elastic pin 330 can be separated after the first module 350 and the second module 340 are mounted to the gearbox 130.

[0049] According to the embodiments which have such a structure and shape, it is possible to prevent noises that are generated by an increase in play due to wear of the support yoke or by the shock that is conversely introduced from the road surface, thus giving a driver a pleasant steering feel while steering.

[0050] Additionally, it is possible to shorten the assembly process and prevent incorrect assembly as well as the loss of any component while each component is being installed in a vehicle.

[0051] Although all elements constituting embodiments of the present disclosure have been described above as combined into a single unit or combined in such a way as to be operated as a single unit, the present disclosure is not necessarily limited to such embodiments. That is to say, at least two elements from all structural elements may be selectively combined and operated without leaving the scope of the present disclosure.

[0052] Additionally, since terms such as "containing," "featuring," and "having" mean that one or more corresponding components may exist, unless expressly stated otherwise, they should be interpreted to mean that one or more other components may be included. All terms used in a technical, scientific, or other way have the same meanings as understood by a person skilled in the art, unless explicitly defined otherwise. General terms found in dictionaries should not be interpreted too ideally or impractically in the context of relevant technical literature, unless expressly defined otherwise in the present disclosure.

[0053] The foregoing embodiments have been described solely for the purpose of illustrating the technical idea of ​​this disclosure, and the person skilled in the art will recognize that various modifications and alterations are possible without departing from the scope and spirit of this disclosure. Therefore, the embodiments of this disclosure are not intended to limit the technical idea of ​​this disclosure, but rather to illustrate it, and the scope of the technical idea of ​​this disclosure is not limited by the embodiments. The scope of this disclosure is to be interpreted on the basis of the accompanying claims in such a way that all technical ideas contained in the scope equivalent to the claims belong to this disclosure.

Claims

[1] Rack and pinion support device of a steering device for a vehicle, which has: a support yoke (301) configured to be inserted into a cylinder (250) of a gearbox (130) to support a rack (140); a first cam part (310) configured to have a front surface supporting the support yoke (301) towards the rack (140), and a rear surface provided with a first cam surface (313) inclined in a circumferential direction thereof; a second cam part (320) configured to have a front surface provided with a second cam surface (317), which is inclined in a circumferential direction to correspond to the first cam surface (313), to have a rear surface, on which one end of a torsion spring (321) is supported and coupled, and has an outer circumferential surface which is provided with an outer circumferential groove (319) formed in an axial direction thereof; a yoke plug (325) configured to have an inner front surface on which the other end of the torsion spring (321) is supported and coupled to be coupled to the cylinder (250), and to be provided with an insert hole (325a) connected to the outer circumferential groove (319); and an elastic pin (330) configured to be inserted into the outer circumferential groove (319) and the insert hole (325a) so that the torsion spring (321) is held in a tensioned state, characterized by, that the elastic pin (330) is provided with an elastic damping element (330b) between pin parts (330a, 330c) which are arranged on both sides of this in a radial direction, in order to be elastically deformable in the radial direction. [2] Rack and pinion support device according to claim 1, wherein a first engagement area (322) in which one end of the torsion spring (321) is supported and coupled is arranged on the rear surface of the second cam part (320), and a second engagement area (329) in which the other end of the torsion spring (321) is supported and coupled is arranged on the inner front surface of the yoke plug (325). [3] Rack and pinion support device according to one of claims 1 or 2, wherein the second cam part (320), the torsion spring (321) and the yoke plug (325) are integrally coupled by the elastic pin (330) which is coupled to the outer circumferential groove (319) and the insert hole (325a) to form a first module (350). [4] Rack and pinion support device according to claim 3, wherein an elastic part (309) is arranged on the front surface of the first cam part (310) for elastically supporting the support yoke (301). [5] Rack support device according to claim 4, wherein the elastic part (309) has a ring shape which tapers from an inner diameter region thereof to an outer diameter region thereof and which is arranged on the front surface of the first cam part (310). [6] Rack and pinion support device according to one of claims 4 or 5, wherein a support part (307) for supporting the elastic part (309) is arranged on the front surface of the elastic part (309), and a coupling hole (307a, 311) is arranged in central regions of the support part (307) and the first cam part (310) such that the first cam part (310), the elastic part (309) and the support part (307) are integrally coupled by a coupling part (305) coupled to the coupling hole (307a, 311) to form a second module (340). [7] Rack and pinion support device according to claim 6, wherein an insert groove (301a) into which a head region (305a) of the coupling part (305) is inserted is arranged on the rear surface of the support yoke (301). [8] Rack and pinion support device according to claim 7, wherein the first cam part (310) is provided with a connecting hole (313a) passing through the front surface and the rear surface and connected to the outer circumferential groove (319) so that the elastic pin (330) is coupled to the insert hole (325a), the outer circumferential groove (319) and the connecting hole (313a) to combine the first module (350) and the second module (340). [9] Rack and pinion support device according to any one of claims 1 to 8, wherein a guide projection (327) formed in the axial direction is arranged on an inner surface of an end of the yoke plug (325), and a guide groove (312) inserted into the guide projection (327) is arranged in the outer circumferential surface of the first cam part (310). [10] Rack and pinion support device of a steering device for a vehicle, comprising: a support yoke (301) configured to be inserted into a cylinder (250) of a gearbox (130) to support a rack (140); a first cam part (310) configured to have a front surface supporting the support yoke (301) towards the rack (140), and a rear surface provided with a first cam surface (313) inclined in a circumferential direction thereof; a second cam part (320) configured to have a front surface provided with the second cam surface (317) inclined in a circumferential direction thereto to correspond to the first cam surface (313), to have a rear surface on which an end of a torsion spring (321) is supported and coupled, and to have a through hole (319a) passing through the front surface and the rear surface; a yoke plug (325) configured to have an inner front surface on which the other end of the torsion spring (321) is supported and coupled to be coupled to the cylinder (250), and to be provided with an insert hole (325a) which is connected to the outer circumferential groove (319); and an elastic pin (330) configured to be inserted into the through hole (319a) and the insert hole (325a) so that the torsion spring (321) is held in a tensioned state, characterized by , that the elastic pin (330) is provided with an elastic damping element (330b) between pin parts (330a, 330c) which are arranged on both sides of this in a radial direction, in order to be elastically deformable in the radial direction.

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