JP2019023050A - Steering device for vehicle - Google Patents

Abstract

To appropriately prevent backlash in a feed screw mechanism through a versatile, simple configuration, in a steering device for a vehicle, which has at least an electric tilt mechanism.SOLUTION: A steering device for a vehicle comprises: an electric motor attached to a steering column; and a feed screw mechanism including a trapezoidal screw shaft (13) rotated and driven around a shaft core by the electric motor and a female screw member (30) spirally engaged with the trapezoidal screw shaft and axially moved according to rotation of the trapezoidal screw shaft. The feed screw mechanism comprises: a hold member (15) attached to a steering column and accommodating the female screw member; and a screw member (plate spring 40) interposed between the hold member and the female screw member and pressing a face of the hold member. The feed screw mechanism can be applied to an electric telescopic mechanism as well.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a steering apparatus for a vehicle, and more particularly to a steering apparatus having an electric tilt mechanism that drives a steering wheel disposed in a steering column in a vertical direction with respect to a vehicle body. The present invention relates to a steering apparatus that also includes an electric telescopic mechanism that drives the vehicle in the front-rear direction with respect to the vehicle body.

  For example, Japanese Patent Application Laid-Open No. 2004-151650 below describes a steering device including the above-described electric tilt mechanism. “A screw shaft and a nut constituting a drive mechanism in a vehicle steering device capable of adjusting at least the steering wheel operation position in the vertical direction of the vehicle body” The purpose of the present invention is to provide a steering device that can be realized at low cost with a small number of parts and that can be easily assembled with a small number of parts. A female screw that includes a screw shaft that rotatably supports a side end portion and rotates by driving a motor, and a nut member that moves in an axial direction in accordance with the rotation of the screw shaft, and the nut member is screwed to the screw shaft. A female screw portion having two flat portions parallel to the screw shaft at positions facing each other at a predetermined distance from the screw shaft, A pivot shaft portion having a rotation axis perpendicular to the axis of the screw portion is provided, and a bearing portion that rotatably supports the pivot shaft portion is provided at the other end of the link mechanism, and the bearing portion and the female screw are provided. A steering device has been proposed that includes a spring member that is interposed between a flat portion of the portion and presses the female screw portion in a direction perpendicular to the screw shaft (see paragraph [0006 of Patent Document 1]. ] And [0007]).

  Further, regarding a steering apparatus equipped with an electric telescopic mechanism, the following Patent Document 2 states, “A movable column is connected to a fixed column so as to be movable in the axial direction, and the axial direction is fixed between the fixed column and the movable column. A telescopic driving screw rod with an electric motor is provided, a telescopic moving body is provided which is movable along the telescopic driving screw rod and has connecting shafts protruding from both side surfaces, and the movable column is provided with the telescopic driving screw rod A support portion connected to the moving body is formed, a mounting recessed portion is formed in the supporting portion, a bearing portion for supporting the connecting shaft of the telescopic moving body is formed, and a reaction force is formed on the mounting recess side An electric telescopic step in which the bearing body is inserted into the mounting recess so that the telescopic moving body and the support portion are connected via the bearing body. By using a ring drive support device, manufacturing accuracy can be kept low, fitting backlash can be removed, the electric telescopic device can be assembled very easily, and the assembly accuracy can be improved. Can be made "(described in paragraph [0004] of Patent Document 2). “The bearing body 8 is formed with a bearing portion 8a into which the connecting shafts 3c and 3c of the telescopic moving body 3 are inserted. Specifically, the bearing portion 8a is shown in FIGS. 3 to 5. As described above, the bearing body 8 is formed as a through hole or a circular recess is formed (described in the same paragraph [0013]). When the portion 8b is formed and the bearing body 8 is inserted into the mounting recesses 7 and 7, as shown in FIG. 7, the crushing portion 8b is crushed and the reaction force is applied to the mounting recesses 7 and 7 side. There is also an embodiment in which the bearing body 8 is firmly disposed in the mounting recesses 7 and 7 by acting on "(described in the paragraph [0015]).

Japanese Patent No. 5782956 Japanese Patent No. 3390205

  The device described in Patent Document 1 is described as follows: “a screw shaft that supports a swingable rear end of the vehicle body on the main housing and rotates by motor driving; and a nut member that moves in the axial direction in accordance with the rotation of the screw shaft. The feed screw mechanism is configured by the screw shaft and the nut member. As described above, the nut member used in this feed screw mechanism is “the nut member is a female screw portion that is screwed into the screw shaft, and is opposed to the screw shaft at a predetermined distance from each other. 4 ”, which includes a female screw portion having two flat portions parallel to the screw shaft at a position and a pivot shaft portion having a rotation axis orthogonal to the axis of the female screw portion. As shown in FIG. 4, the tilt mechanism has a specific shape and structure. In order to prevent rattling between the screw shaft and the nut member, a spring member is interposed between the flat surface portion of the female screw portion and the bearing portion of the link mechanism. It is unique, and a spring member is interposed between the bearing portion of the link mechanism and the nut member to prevent backlash, and assembly is not easy. Therefore, these configurations cannot be applied as they are to other feed screw mechanisms mounted on a vehicle, for example, a feed screw mechanism used for a telescopic mechanism.

  On the other hand, in the apparatus described in Patent Document 2, a telescopic moving body is provided that is movable along the telescopic driving screw rod and has connecting shafts protruding from both side surfaces. A feed screw mechanism is constituted by the rod and the moving body. The moving body provided for the feed screw mechanism is to be compared with the nut member described above, but has a shape and structure peculiar to the telescopic mechanism as shown in FIG. In Patent Document 2, it is described as “removing the backlash of the fitting portion”, but it is intended for play between the support portion and the bearing body described in Patent Document 2, and is described in Patent Document 1. Such a backlash between the screw shaft and the nut member is not prevented. Therefore, the configuration for preventing rattling described in Patent Document 2 cannot be applied between the screw shaft and the nut member as described in Patent Document 1, and Patent Documents 1 and 2 describe a tilt mechanism and a telescopic device, respectively. In order to prevent rattling specific to the mechanism, a configuration unique to each mechanism has been proposed.

  Therefore, the present invention relates to a vehicle steering apparatus including at least an electric tilt mechanism, and an object thereof is to provide a steering apparatus that can appropriately prevent play in a feed screw mechanism with a simple configuration having versatility.

  In order to achieve the above object, the present invention provides a vehicle steering apparatus including an electric tilt mechanism that drives a steering wheel disposed in a steering column in a vertical direction with respect to a vehicle body, and is mounted on the steering column. An electric motor, a trapezoidal screw shaft that is driven to rotate about the axis by the electric motor, and a female screw member that is screwed to the trapezoidal screw shaft and moves in the axial direction in accordance with the rotation of the trapezoidal screw shaft. A feed screw mechanism that is mounted on the steering column, is interposed between the holding member that accommodates the female screw member, and the holding member and the female screw member. And a spring member that presses one surface of the holding member. The “front-rear direction” and the “up-down direction” do not necessarily mean directions parallel to and perpendicular to the road surface, but include directions inclined with respect to the road surface (the same applies hereinafter).

  In particular, in a vehicle steering apparatus including an electric tilt mechanism that drives a steering wheel disposed in a steering column in a vertical direction with respect to a vehicle body, and an electric telescopic mechanism that drives the steering wheel in a longitudinal direction with respect to the vehicle body. The electric tilt mechanism and the electric telescopic mechanism are respectively mounted on an electric motor mounted on the steering column, a trapezoidal screw shaft rotated around the axis by the electric motor, and the trapezoidal screw shaft. A feed screw mechanism including a female screw member that is screwed and moves in the axial direction according to the rotation of the trapezoidal screw shaft, and the feed screw mechanism is mounted on the steering column and accommodates the female screw member And a holding member that is interposed between the holding member and the female screw member and presses one surface of the holding member It may be assumed that a member.

  In the above steering device, the female screw member is formed of a hexahedron having a rectangular plane, and has a female screw hole that penetrates between two opposing surfaces of the hexahedron and is screwed to the trapezoidal screw shaft, and the holding member. Has at least one engagement hole for holding the spring member on the one surface, and the spring member is located on both sides of one surface of the female screw member facing one surface of the holding member. It is good to comprise by the leaf | plate spring which has two latching claw parts latched by a side surface, and at least 1 engagement convex part engaged with the said engagement hole of the said holding member. The engagement convex portion of the leaf spring may be a bent portion formed so as to protrude outward from at least one of both corners of the one surface and the side surfaces of the female screw member. Further, it is preferable that a reduction mechanism having a worm gear connected to the electric motor and a wheel gear meshing with the worm gear is provided, and the trapezoidal screw shaft is connected to the wheel gear of the reduction mechanism.

  Since this invention is comprised as mentioned above, there exist the following effects. That is, the present invention provides a vehicle steering apparatus including an electric tilt mechanism that drives a steering wheel disposed in a steering column in a vertical direction with respect to a vehicle body, and includes an electric motor mounted on the steering column and an electric motor. A feed screw mechanism comprising a trapezoidal screw shaft that is driven to rotate about an axis, and a feed screw mechanism that includes a female screw member that engages with the trapezoidal screw shaft and moves in the axial direction in accordance with the rotation of the trapezoidal screw shaft. Is provided with a holding member that is attached to the steering column and accommodates the female screw member, and a spring member that is interposed between the holding member and the female screw member and presses one surface of the holding member. Since the female screw member is pressed against the trapezoidal screw shaft in the direction perpendicular to the axis by the biasing force of the spring member, the feed screw mechanism has a simple configuration with versatility. It is possible to appropriately prevent the definitive backlash. Moreover, if the spring member is housed together with the female screw member in the holding member, they can be easily assembled to the steering column.

  In particular, in a steering apparatus having both an electric tilt mechanism and an electric telescopic mechanism, an electric motor mounted on the steering column, a trapezoidal screw shaft that is driven to rotate around an axis by the electric motor, and a trapezoidal screw shaft. A feed screw mechanism comprising a female screw member that is screwed and moves in the axial direction in accordance with the rotation of the trapezoidal screw shaft, the feed screw mechanism mounted on the steering column, and a holding member that accommodates the female screw member; If a spring member that is interposed between the holding member and the female screw member and presses one surface of the holding member is provided, the backlash of the feed screw mechanism can be reduced with a simple and inexpensive configuration common to both mechanisms. Can be appropriately prevented and can be easily assembled to the steering column.

  In the above steering device, the female screw member is configured by a hexahedron having a rectangular plane, and has a female screw hole that passes through two opposite faces of the hexahedron and is screwed into a trapezoidal screw shaft. One surface has at least one engaging hole for locking the spring member, and the spring member is locked to the side surfaces on both sides of the one surface of the female screw member facing one surface of the holding member. If it is constituted by a leaf spring having two locking claws and at least one engagement convex portion that engages with the engagement hole of the holding member, the female screw member is moved against the trapezoidal screw shaft by the urging force of the leaf spring. Since it is pressed in the direction perpendicular to the axis, play in the feed screw mechanism can be appropriately prevented with a simple and inexpensive configuration. In particular, if the engagement convex portion of the leaf spring is configured with a bent portion formed so as to protrude outwardly from at least one of both corners of one side and both side surfaces of the female screw member, manufacturing is easy. And an inexpensive spring member can be provided. Furthermore, if a reduction mechanism having a worm gear connected to the electric motor and a wheel gear meshing with the worm gear is provided and the trapezoidal screw shaft is connected to the wheel gear of the reduction mechanism, the output of the electric motor is It is appropriately decelerated and transmitted to the trapezoidal screw shaft, and reverse input from the trapezoidal screw shaft side is reliably prevented.

It is a side view which shows the steering device which concerns on one Embodiment of this invention. It is a bottom view which shows the steering device which concerns on one Embodiment of this invention. It is sectional drawing which shows the column housing, link member, holding member, female screw member, leaf | plate spring, etc. which are provided to the electric tilt mechanism of one Embodiment of this invention. It is a fragmentary sectional front view which shows the assembly | attachment condition of the holding member, female screw member, and leaf | plate spring with which the electric tilt mechanism of one Embodiment of this invention is provided. It is a perspective view which shows the assembly | attachment condition of the holding member, female screw member, and leaf | plate spring with which the electric tilt mechanism of one Embodiment of this invention is provided. It is a fragmentary sectional front view which shows the assembly | attachment condition of the holding member of the other aspect provided to the electric tilt mechanism of one Embodiment of this invention, a female screw member, and a leaf | plate spring. It is a fragmentary sectional front view which shows the assembly | attachment condition of the column tube, holding member, female screw member, and leaf | plate spring with which the electric telescopic mechanism of one Embodiment of this invention is provided. It is a perspective view which shows the assembly | attachment condition of the column tube provided to the electric telescopic mechanism of one Embodiment of this invention, a holding member, a female screw member, and a leaf | plate spring. It is a fragmentary sectional front view which shows the assembly | attachment condition of the column tube of another aspect used for the electric telescopic mechanism of one Embodiment of this invention, a holding member, a female screw member, and a leaf | plate spring.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an overall configuration of a steering apparatus according to an embodiment of the present invention. A column housing 2 constituting a steering column (reference numeral omitted) is held by a fixed bracket 1 fixed to a vehicle body VB. The column housing 2 is supported to be swingable with respect to the vehicle body VB, and the column tube 3 is supported to be movable in the axial direction with respect to the column housing 2, and the electric tilt mechanism 10 and the electric telescopic mechanism 20 are mounted. Has been. The fixing bracket 1 has a pair of holding portions (represented by 1a as a representative) that extend below the vehicle and face each other, and the column housing 2 is held between them, and is fixed to the vehicle body at the top in FIG. The A steering shaft 4 is housed and held in the column tube 3, a steering wheel (not shown) is fixed to the rear end of the steering shaft 4, and a steering mechanism (not shown) is connected to the front end of the steering shaft 4. Is done. This steering mechanism is driven according to the operation of the steering wheel, and is configured to steer a steered wheel (not shown) via a wheel steering mechanism (not shown).

  As shown in FIGS. 1 and 2, the electric tilt mechanism 10 includes an electric motor 11 supported by the column housing 2 and a feed screw mechanism 12, and the feed screw mechanism 12 is centered on the axis by the electric motor 11. A trapezoidal screw shaft 13 that is rotationally driven and a female screw member 30 that is screwed into the trapezoidal screw shaft 13 and moves in the axial direction in accordance with the rotation thereof are provided. In this embodiment, it has the link mechanism 5 by which one end is supported by the fixed bracket 1, and the link member 14 is supported by the other end so that rotation is possible centering on the pivot axis (P2). As shown in FIG. 1, the link mechanism 5 is supported below the fixed bracket 1 such that the upper ends of a pair of links (typically represented by 5a) are rotatable about the pivot shaft (P1). Is supported at the rear upper end of the link member 14 so as to be rotatable about the pivot shaft (P2). The link member 14 has a middle portion thereof supported below the column housing 2 so as to be rotatable around a pivot shaft (P3), and has a pair of arms (typically represented by 14a). A female screw member 30 accommodated in the holding member 15 is supported so as to be rotatable about a pivot shaft (P4).

  The female screw member 30 of the present embodiment is made of a synthetic resin, and is composed of a rectangular flat hexahedron as shown in FIGS. 4 and 5. The female screw member 30 penetrates between two opposite faces of the six faces and is screwed to the trapezoidal screw shaft 13. A female screw hole 31 that is accommodated in the holding member 15. As shown in FIGS. 4 and 5, the holding member 15 of the present embodiment includes a cylindrical main body having a rectangular cross section, and pivot shafts 15 b and 15 b extending from both side surfaces on the small area side, These are supported by the link member 14 by bolts B and B as shown in FIG. 3, and the holding member 15 is attached to the column housing 2 (steering column). In other words, the pivot shafts 15b and 15b are rotatably supported between the pair of arm portions 14a of the link member 14 by the bolts B and B constituting the pivot shaft (P4). The pivot shaft (P4) is supported rotatably. As shown in FIG. 5, through holes 15c through which the trapezoidal screw shaft 13 is inserted are formed on both side surfaces of the cylindrical main body portion of the holding member 15, and a side surface (one surface 15a) on the small area side is formed. Engagement holes 15d and 15e are formed on both sides of the pivot shaft portion 15b.

  Further, a leaf spring 40 is interposed between the holding member 15 and the female screw member 30 as a spring member that presses the one surface 15 a of the holding member 15. The leaf spring 40 includes two locking claws 41 and 42 that are locked to the side surfaces 30b and 30c on both sides of one surface 30a of the female screw member 30 that faces one surface 15a of the holding member 15, and Engaging protrusions 43 and 44 that engage with the engaging holes 15d and 15e of the member 15 are provided, and these are integrally formed. As shown in FIGS. 4 and 5, the engaging protrusions 43 and 44 of the leaf spring 40 in this embodiment are outward from both corners of one surface 30 a and both side surfaces 30 b and 30 c of the female screw member 30. Therefore, it can be easily and inexpensively manufactured.

  Then, as indicated by arrows in FIG. 5, the female screw member 30 is gripped by the locking claws 41 and 42, and both are accommodated in the holding member 15 in a state where the leaf spring 40 is held by the female screw member 30. Is done. As a result, as shown in FIG. 4, the female screw member 30 is pressed against the inner surface of the holding member 15 by the urging force of the leaf spring 40, and the engaging convex portions 43 and 44 are engaged with the engaging holes 15 d of the holding member 15. Engage with 15e. Therefore, since these can be mounted on the link member 14 (and eventually the steering column) as a subassembly, they can be assembled easily. Further, even after the mounting, the engaging protrusions 43 and 44 of the leaf spring 40 are held in a state of being engaged with the engaging holes 15 d and 15 e of the holding member 15, so that the female screw member 30 is detached from the holding member 15. Can be reliably prevented.

  Thus, as shown in FIG. 1, when the female screw member 30 moves in the axial direction of the trapezoidal screw shaft 13 together with the holding member 15 in accordance with the rotational drive of the trapezoidal screw shaft 13 by the electric motor 11, the link member 14 is moved. While swinging about the pivot shaft (P3), the pair of links 5a swings about the pivot shaft (P1), and the column housing 2 (and the column tube 3, the steering shaft 4 and the steering wheel) are moved up and down the vehicle body. The steering wheel (not shown) can be adjusted to a desired vertical position of the vehicle body. At this time, the female screw member 30 is pressed against the trapezoidal screw shaft 13 by a biasing force of the leaf spring 40 in a direction perpendicular to the axis of the trapezoidal screw shaft 13, and the backlash of the trapezoidal screw shaft 13 is suppressed. (Not shown) can be prevented appropriately. As described above, the leaf spring 40 has both an urging function and a holding function with respect to the female screw member 30.

  In this embodiment, a worm gear (not shown) connected to the electric motor 11 and a speed reduction mechanism 16 having a wheel gear (not shown) meshed with the worm gear are provided, and the wheel gear is trapezoidal. The screw shaft 13 is connected so that the output of the electric motor 11 is appropriately decelerated and transmitted to the trapezoidal screw shaft 13, and reverse input from the trapezoidal screw shaft 13 side is reliably prevented by so-called self-locking. Is done.

  As another aspect of the holding member 15 and the leaf spring 40 provided for the electric tilt mechanism 10, it can be configured as shown in FIG. That is, the main body portion of the holding member 15 has a bottomed cylindrical shape, has a bag hole 15f that opens only on one side, the above-described through hole 15c (not shown in FIG. 6), and one engagement hole 15d. Is formed. And the leaf | plate spring 40 shown in FIG. 6 should just have only the engagement convex part 43 engaged with the engagement hole 15d, Therefore It can manufacture easily with a still simpler structure. In addition, since the other structure is the same as that of the structure as described in FIG.4 and FIG.5, the same code | symbol is attached | subjected to the substantially same member and description is abbreviate | omitted.

  On the other hand, the electric telescopic mechanism 20 includes an electric motor 21 supported by the column housing 2 and a feed screw mechanism 22 mainly as shown in FIG. 1, and the feed screw mechanism 22 is centered on the axis by the electric motor 21. A trapezoidal screw shaft 23 that is rotationally driven and a female screw member 30 that is screwed into the trapezoidal screw shaft 23 and moves in the axial direction in accordance with the rotation thereof are provided. In the present embodiment, the female screw member 30 is accommodated in the holding member 25 fixed to the column tube 3. The electric telescopic mechanism 20 also includes a reduction mechanism 26 having a worm gear (not shown) coupled to the electric motor 21 and a wheel gear (not shown) meshing with the worm gear, and the trapezoidal screw shaft is provided on the wheel gear. 23 are connected.

  The female screw member 30 provided to the electric telescopic mechanism 20 is also configured in the same manner as described above, and is configured as a hexahedron having a rectangular plane as shown in FIGS. 7 and 8, and the trapezoidal screw shaft 13 penetrates between two opposing surfaces. Has a female screw hole 31 to be screwed into the holding member 25. As shown in FIG. 8, the holding member 25 of the present embodiment has a cylindrical shape having a rectangular cross section, and U-shaped through holes 25c through which the trapezoidal screw shafts 23 are inserted are formed on both side surfaces on the large area side. At the same time, engagement holes 25d and 25e are formed in the side surface (one surface 25a) on the small area side. One end of the holding member 25 is fixed to the column tube 3 by welding, for example, and the holding member 25 is attached to the steering column. Installed. A leaf spring 40 is interposed between the holding member 25 and the female screw member 30 as a spring member that presses the one surface 25 a of the holding member 25. The leaf spring 40 is also configured in the same manner as described above, and has two locking claws that are locked to the side surfaces 30b and 30c on both sides of the one surface 30a of the female screw member 30 facing the one surface 25a of the holding member 25. 41 and 42, and engaging convex portions 43 and 44 that engage with the engaging holes 25d and 25e of the holding member 25, which are integrally formed.

  As shown in FIGS. 7 and 8, the engaging protrusions 43 and 44 of the leaf spring 40 in the present embodiment are also outward from both corners of the one surface 30a of the female screw member 30 and the side surfaces 30b and 30c on both sides. Therefore, it can be easily and inexpensively manufactured. Then, as indicated by arrows in FIG. 8, the female screw member 30 is gripped by the locking claws 41 and 42, and both are accommodated in the holding member 25 in a state where the leaf spring 40 is held by the female screw member 30. Is done. As a result, as shown in FIG. 7, the female screw member 30 is pressed against the inner surface of the holding member 25 by the urging force of the leaf spring 40, and the engaging convex portions 43 and 44 are engaged with the engaging holes 25 d of the holding member 25. Since it hold | maintains in the state engaged with 25e, the drop-off | omission of the female screw member 30 from the holding member 25 can be prevented reliably.

  Thus, as shown in FIG. 1, when the column tube 3 moves in the axial direction of the trapezoidal screw shaft 23 relative to the column housing 2 in accordance with the rotational drive of the electric motor 21, the steering shaft 4 and the column tube 3 together with the vehicle body By moving in the front-rear direction, a steering wheel (not shown) can be adjusted to a desired position in the front-rear direction of the vehicle body. At this time, the female screw member 30 is pressed against the holding member 25 in a direction perpendicular to the axis of the trapezoidal screw shaft 23 by the urging force of the leaf spring 40, and the backlash of the trapezoidal screw shaft 23 is suppressed. A backlash of a steering wheel (not shown) can be prevented appropriately. In this embodiment as well, the output of the electric motor 21 is appropriately reduced by the reduction mechanism 26 and transmitted to the trapezoidal screw shaft 23.

  As another embodiment of the holding member 25 and the leaf spring 40 provided for the electric telescopic mechanism 20, as shown in FIG. 9, the holding member 25 has only an engagement hole 25 d, and the leaf spring 40 has an engagement protrusion 43. It is good also as what has only. That is, only one engagement hole 25d is formed in the holding member 25, and only the engagement convex portion 43 that engages with the engagement hole 25d is required to be formed in the leaf spring 40. It can be easily manufactured with a simple structure. Since the other configurations are the same as the configurations described in FIGS. 7 and 8, substantially the same members are denoted by the same reference numerals and description thereof is omitted.

  As described above, in the steering apparatus having both the electric tilt mechanism 10 and the electric telescopic mechanism 20 as shown in FIGS. 1 and 2, the feed screw is provided by the female screw member 30 and the leaf spring 40 common to both mechanisms. The play in the mechanisms 12 and 22 can be prevented appropriately, and the female screw member 30 and the leaf spring 40 can be accommodated in the holding members 15 and 25, respectively, and can be easily assembled to the steering column.

1 Fixed bracket 2 Column housing (steering column)
3 Column tube (steering column)
4 Steering shaft 5 Link mechanism 10 Electric tilt mechanism 20 Electric telescopic mechanism 11, 21 Electric motor 12, 22 Feed screw mechanism 13, 23 Trapezoidal screw shaft 14 Link member 15, 25 Holding member 16, 26 Deceleration mechanism 30 Female screw member 31 Female Screw hole 40 Leaf spring (spring member)
41, 42 Locking claw parts 43, 44 Engaging convex part

Claims (8)

A vehicle steering device including an electric tilt mechanism that drives a steering wheel disposed in a steering column in a vertical direction with respect to a vehicle body,
An electric motor mounted on the steering column;
A feed screw mechanism comprising a trapezoidal screw shaft that is driven to rotate about an axis by the electric motor, and a female screw member that is screwed to the trapezoidal screw shaft and moves in the axial direction in accordance with the rotation of the trapezoidal screw shaft. With
The feed screw mechanism is
A holding member mounted on the steering column and containing the female screw member;
A steering apparatus for a vehicle, comprising: a spring member that is interposed between the holding member and the female screw member and presses one surface of the holding member. The female screw member is constituted by a rectangular flat hexahedron, and has a female screw hole that penetrates between two opposing faces of the hexahedron and is screwed to the trapezoidal screw shaft,
The holding member has at least one engagement hole for holding the spring member on the one surface,
The spring member is engaged with two engaging claws that are engaged with both side surfaces of one surface of the female screw member facing one surface of the holding member, and the engagement hole of the holding member. The vehicle steering apparatus according to claim 1, wherein the vehicle steering apparatus is configured by a leaf spring having at least one engaging projection. The engagement convex portion of the leaf spring is a bent portion formed so as to protrude outwardly from at least one of both corners of the one surface and the side surfaces on both sides of the female screw member. The vehicle steering apparatus according to claim 2. The worm gear connected to the electric motor and a speed reduction mechanism having a wheel gear meshing with the worm gear are provided, and the trapezoidal screw shaft is connected to the wheel gear of the speed reduction mechanism. The vehicle steering device according to any one of the preceding claims. A vehicle steering apparatus comprising: an electric tilt mechanism that drives a steering wheel disposed in a steering column in a vertical direction with respect to a vehicle body; and an electric telescopic mechanism that drives the steering wheel in a longitudinal direction with respect to the vehicle body. ,
The electric tilt mechanism and the electric telescopic mechanism are respectively
An electric motor mounted on the steering column;
A trapezoidal screw shaft that is rotationally driven about the shaft core by the electric motor, and a feed screw that includes a female screw member that is engaged with the trapezoidal screw shaft and moves in the axial direction in accordance with the rotation of the trapezoidal screw shaft. With a mechanism,
The feed screw mechanism is
A holding member mounted on the steering column and containing the female screw member;
A steering apparatus for a vehicle, comprising: a spring member that is interposed between the holding member and the female screw member and presses one surface of the holding member. The female screw member is constituted by a rectangular flat hexahedron, and has a female screw hole that penetrates between two opposing faces of the hexahedron and is screwed to the trapezoidal screw shaft,
The holding member has at least one engagement hole for holding the spring member on the one surface,
The spring member is engaged with two engaging claws that are engaged with both side surfaces of one surface of the female screw member facing one surface of the holding member, and the engagement hole of the holding member. 6. The vehicle steering apparatus according to claim 5, wherein the vehicle steering apparatus comprises a leaf spring having at least one engaging projection. The engagement convex portion of the leaf spring is a bent portion formed so as to protrude outwardly from at least one of both corners of the one surface and the side surfaces on both sides of the female screw member. The vehicle steering apparatus according to claim 6. The worm gear connected to the electric motor and a reduction mechanism having a wheel gear meshing with the worm gear, and the trapezoidal screw shaft is connected to the wheel gear of the reduction mechanism. The vehicle steering device according to any one of the preceding claims.

Images