JP4395713B2 - Tilt steering device - Google Patents

Description

  The present invention relates to a tilt steering device.

  The tilt steering device that can adjust the position of the steering wheel in the vertical direction according to the physique of the driver, etc. has a connecting shaft comprising a bolt shaft on a side plate of a holding bracket held on the vehicle body and a movable bracket fixed on the steering column. There are some that connect the side plates of both brackets. This type of tilt steering device achieves tilt lock by pressing and coupling the side plates of both brackets between the head of the bolt shaft and the nut.

  Usually, the holding bracket is held on the vehicle body via a connecting member that can be broken at the time of impact. This connecting member is designed to break when an impact load of a predetermined value or more acts in the longitudinal direction of the steering column due to so-called secondary collision. Thus, the impact energy is absorbed, and the steering column can slide in the longitudinal direction with respect to the vehicle body together with the holding bracket, thereby mitigating the impact given to the driver.

However, the movable bracket and the holding bracket rotate relative to each other around the connecting shaft during an impact action. In this case, the moment load of the holding bracket becomes large, and the impact load cannot be used well as the force in the sliding direction of the holding bracket. As a result, the connecting member is difficult to break, and there is a possibility that the impact absorbing function is adversely affected.
Therefore, there has been proposed a structure in which a holding bracket and a movable bracket are each provided with tooth bodies having a plurality of teeth that can mesh with each other when subjected to an impact load to prevent relative rotation of both brackets at the time of a secondary collision. (For example, refer to Patent Documents 1 and 2).
JP-A-11-291922. JP 2000-344115 A.

However, according to the configurations of Patent Documents 1 and 2, a tooth body having a plurality of teeth must be provided on both the holding bracket and the movable bracket, resulting in high manufacturing costs.
The present invention has been made under such a background, and an object of the present invention is to provide a tilt steering device that can reliably slide a holding bracket with respect to a vehicle body by an impact load and is inexpensive.

In order to achieve the above object, according to the first invention, one of the first and second brackets, one of which is held on the vehicle body with a predetermined holding force and the other is fixed to the steering column, and the first and second And a connecting shaft that connects the side plates of the bracket so that the tilt can be adjusted, and the bracket that is held by the vehicle body slides in a predetermined sliding direction with respect to the vehicle body when receiving an impact load that exceeds the predetermined holding force. In the steering apparatus, the bracket fixed to the steering column includes a side plate having a lower end connected to the steering column, and a protrusion formed integrally with the first bracket and a protrusion formed integrally with the second bracket. An engagement portion, and the relative rotation of the first and second brackets around the connecting shaft by the engagement of the protrusion and the protrusion engagement portion. There is restricted, the protruding engagement portion, characterized in that it comprises an edge portion of the elongated arc-shaped connecting shaft insertion holes formed in the side plate of the second bracket.

  According to the present invention, since the mutual coupling strength of the first and second brackets around the connecting shaft can be made extremely high, relative rotation of both brackets due to impact load can be prevented. Therefore, the component acting in the sliding direction of the impact load can be transmitted well to the bracket held by the vehicle body, and the impact absorption function can be exhibited by reliably sliding the bracket held by the vehicle body in the sliding direction. .

Further, it is only necessary to provide a protrusion that is extremely easy to form and a protrusion engaging portion that engages with the protrusion, and the cost is low. Furthermore, since these protrusions and protrusion engaging portions are integrally formed on the corresponding bracket, the number of parts is reduced and the cost is lower. Further, the protrusion can be disposed in the connecting shaft insertion hole, and the apparatus can be prevented from being enlarged.
In the second aspect of the invention , the tilt adjustment is performed on the first and second brackets, one of which is held by the vehicle body with a predetermined holding force and the other is fixed to the steering column, and the side plates of the first and second brackets. A steering column, wherein the bracket is held in the vehicle body and slides in a predetermined sliding direction with respect to the vehicle body by receiving an impact load exceeding the predetermined holding force. The bracket fixed to the bracket includes a side plate having a lower end connected to the steering column, and further includes a protrusion integrally formed with the first bracket and a protrusion engaging portion integrally formed with the second bracket. The engagement between the protrusion and the protrusion engaging portion restricts the relative rotation of the first and second brackets around the connecting shaft, Parts is characterized in that it is formed a relative movement of the projection at the time of tilt adjusting the guidable arcuate.
According to the present invention, since the mutual coupling strength of the first and second brackets around the connecting shaft can be made extremely high, relative rotation of both brackets due to impact load can be prevented. Therefore, the component acting in the sliding direction of the impact load can be transmitted well to the bracket held by the vehicle body, and the impact absorption function can be exhibited by reliably sliding the bracket held by the vehicle body in the sliding direction. . Further, even if the position of the protrusion relative to the protrusion engaging portion is changed by tilt adjustment, relative rotation around the connecting shaft of both brackets can be reliably prevented.
According to a third invention, in the first or second invention, the first bracket is a bracket fixed to the steering column, and the bracket fixed to the steering column has a lower end connected to the steering column. It includes a pair of side plates and an upper plate that connects the upper ends of the pair of side plates, and the protrusion is formed integrally with the upper plate and extends from the upper plate to the side .

According to a fourth invention, in the second invention, the protrusion engaging portion includes an edge portion of a side plate of the second bracket. According to the present invention, by engaging the protrusions with the front end edge and the rear end edge of the side plate of the second bracket, the relative rotation around the connecting shaft of both brackets is restricted in any rotation direction. it can. Thereby, it is possible to prevent the brackets from rotating relative to each other when the device itself is transported or the like, and to eliminate the trouble of correcting the position shifts of the brackets when assembled to the vehicle body.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view in which a part of a tilt steering device 1 according to an embodiment of the present invention is omitted. 2 is a partial cross-sectional view taken along line II-II in FIG. Referring to FIG. 1, the tilt steering device 1 includes a steering column 4 that rotatably supports a steering shaft 3 to which a steering wheel 2 is fixed at one end. Normally, the steering column 4 is disposed with its first and second longitudinal directions (hereinafter, also simply referred to as “first longitudinal direction S1” and “second longitudinal direction S2”) inclined with respect to the horizontal direction. However, in FIG. 1, the first longitudinal direction S1 and the second longitudinal direction S2 are shown horizontally.

  Referring to FIG. 2, the steering column 4 includes an upper jacket 5 made of a tube that rotatably supports the steering shaft 3, and a movable bracket 6 as a first bracket is fixed to the upper jacket 5. Yes. The movable bracket 6 is formed in a cross-sectional groove shape using a single plate member, and extends upward from the upper jacket 5 and faces a pair of side plates 7 and 8, and upper ends of the side plates 7 and 8. Are connected to each other.

On the other hand, the holding bracket 12 as the second bracket held by the vehicle body 11 via the pair of attachment bodies 10 as the first shock absorbing mechanism includes a pair of side plates 13 and 14 facing each other, 14 is provided with an upper plate 15 that connects the upper end portions of 14 to each other, and an attachment stay 16 that is fixed to the upper surface of the upper plate 15.
Cutouts 17 are formed in the left and right ends of the mounting stay 16, respectively. This notch 17 is opened to the rear of the vehicle body 11 (the steering wheel 2 side, the front side of the paper surface of FIG. 2).

  Each mounting body 10 is inserted through a corresponding notch 17 of the mounting stay 16 of the holding bracket 12 to sandwich the mounting stay 16 from the vertical direction B, and passes through the mounting stay 16 and the corresponding clamping piece 18. And an engaging member 19 that connects the two. Relative movement of the steering column 4 in the first and second longitudinal directions S1 and S2 (see FIG. 1) is restricted by the engaging member 19 between the holding piece 18 corresponding to the mounting stay 16.

Referring to FIG. 2 again, a plurality of (for example, four) engaging members 19 are provided in each attachment body 10. Each clamping piece 18 is formed with a bolt insertion hole 20, and a bolt 21 inserted through each bolt insertion hole 20 is screwed into the vehicle body 11.
Referring to FIG. 1, with respect to the first and second longitudinal directions S <b> 1 and S <b> 2, the holding bracket 12 is held on the vehicle body 11 with a predetermined holding force F (for example, 1.5 kN) via the attachment body 10. . That is, when an impact load C exceeding the holding force F is applied to the attachment body 10, the engagement member 19 is broken. This
The impact energy acting on the mounting body 10 is absorbed, the connection between the mounting body 10 and the mounting stay 16 of the holding bracket 12 is released, and the holding bracket 12 slides in the sliding direction P (second longitudinal direction S2) with respect to the vehicle body 11. Slidable in a direction parallel to

Referring to FIG. 2, the tilt steering device 1 holds the movable bracket 6 by pressing the pair of side plates 13 and 14 of the holding bracket 12 and the corresponding pair of side plates 7 and 8 of the movable bracket 6. The bracket 12 is fixed.
Specifically, connecting shafts 22 for connecting the side plates 7 and 8 of the movable bracket 6 and the corresponding side plates 13 and 14 of the holding bracket 12 so as to be tilt-adjustable are formed on the side plates 7 and 8 of the movable bracket 6, respectively. Connecting shaft holding hole 23 and holding bracket 1
The pair of side plates 13 and 14 are inserted into the connecting shaft insertion holes 24 each having a vertically long circular arc shape.

A shaft head 25 as a fastening member for fastening the side plate 14 of the holding bracket 12 from the outside is integrally formed at one end of the connecting shaft 22. Of the one end portion of the connecting shaft 22, a portion 26 close to the shaft head portion 25 is formed in a substantially rectangular shape having a vertically long cross section. This portion 26 engages with the connecting shaft insertion hole 24 of the side plate 14 of the holding bracket 12 and restricts the rotation of the connecting shaft 22. On the other hand, a threaded portion 27 is provided at the other end of the connecting shaft 22 and is screwed into the nut 28.

A cam mechanism 31 for achieving a tilt lock having a cam 29 and a cam follower 30 is provided between the nut 28 and the side plate 13 of the holding bracket 12.
The cam 29 has a disk shape having an insertion hole 32 through which the connecting shaft 22 is inserted, and is connected to one end of the main body 34 of the tilt operation lever 33 so as to be integrally rotatable. Accordingly, the cam 29 can be rotated around the connecting shaft 22 by gripping the grip portion 35 provided at the other end of the main body portion 34 of the tilt operation lever 33 and rotating the tilt operation lever 33. . A washer 36 is interposed between the cam 29 and the nut 28, and a locking member 37 of the nut 28 is held by the main body 34 of the tilt operation lever 33.

  The cam follower 30 is a fastening member that tightens the side plate 13 of the holding bracket 12 from the outside, and is interposed between the cam 29 and the side plate 13. The connecting shaft 22 is inserted through the insertion hole 38 of the cam follower 30. In the cam follower 30, an insertion convex portion 39 protrudes from the surface of the holding bracket 12 facing the side plate 13. The insertion convex portion 39 is formed in a substantially rectangular shape whose section is vertically long and is fitted into the connecting shaft insertion hole 24, and restricts the rotation of the cam follower 30.

  The opposing surfaces 40 and 41 of the cam 29 and the cam follower 30 that are opposite to each other are provided with irregularities having shapes corresponding to each other. With the above configuration, the cam follower 30 can be moved in the left-right direction A with respect to the cam 29 by rotating the cam 29. That is, the cam follower 30 can be pressed against the side plate 13 of the holding bracket 12 or the pressure can be released.

  A lower jacket 42 made of a tube is fitted to the upper jacket 5. The lower jacket 42 is swingably supported around a pivot shaft (tilt center axis) (not shown) supported by the vehicle body 11. The upper jacket 5 and the lower jacket 42 are ironed together so as to be slidable relative to each other in the first and second longitudinal directions S1 and S2 (see FIG. 1) to form a second shock absorbing mechanism 43. As a result, when an impact load of a predetermined value or more is applied due to secondary collision or the like, the upper jacket 5 and the lower jacket 42 slide relative to each other while generating frictional resistance to absorb impact energy.

Referring to FIG. 1, the present embodiment is characterized in that a protrusion 44 is integrally formed on the movable bracket 6 and a protrusion engaging portion 45 is integrally formed on the holding bracket 12. The engagement of the joint portion 45 restricts the relative rotation of the movable bracket 6 and the holding bracket 12 around the connecting shaft 22.
With reference to FIG. 1 and FIG. 3 which is a perspective view of the movable bracket 6, the protrusion 44 projects, for example, a part of the upper end of the side plates 7 and 8 of the movable bracket 6 to the outside in the left-right direction A. It is formed with. Each protrusion 44 is arranged side by side with the connecting shaft holding hole 23 in the vertical direction B, and is inserted into the connecting shaft insertion hole 24 of the holding bracket 12.

The protrusion engaging portion 45 is provided at the front end edge portion 46 and the rear end edge portion 47 of each connection insertion hole 24 of the side plates 13 and 14 of the holding bracket 12. That is, each protrusion engaging portion 45 has an arc shape and can guide relative movement of the protrusion 44 during tilt adjustment.
With the above configuration, a so-called secondary collision in which the driver collides with the steering wheel 2 due to the collision of the vehicle body 11 occurs, for example, toward the vehicle body front (the direction of the white arrow in the same direction as the second longitudinal direction S2). When the impact load C is generated, the impact load C is transmitted to the connecting shaft 22 via the movable bracket 6 and the like, and further transmitted to the mounting body 10 via the cam follower 30 and the holding bracket 12 to break the mounting body 10. . At this time, the relative rotation of the brackets 6 and 12 around the connecting shaft 22 is restricted by the engagement of the protrusion 44 of the movable bracket 6 and the protrusion engaging portion 45 of the holding bracket 12. Thereby, it is possible to prevent an unnecessary moment load from acting on the holding bracket 12 and to reliably transmit a component related to the sliding direction P in the impact load C to the mounting body 10.

  Thus, according to the present embodiment, the coupling strength between the movable bracket 6 and the holding bracket 12 around the connecting shaft 22 can be made extremely high by the engagement between the projection 44 and the projection engaging portion 45. The relative rotation of the brackets 6 and 12 due to the load C can be prevented. Therefore, the component acting in the sliding direction P in the impact load C can be transmitted to the holding bracket 12 and the holding bracket 12 can be reliably slid in the sliding direction P to exhibit the shock absorbing function.

That is, the impact load C can be successfully used as the force in the sliding direction P of the holding bracket 12 without applying an unnecessary moment load to the holding bracket 12, and the second shock absorbing mechanism 43 can exhibit a sufficient shock absorbing function. Can do.
By setting the distance D between the connecting shaft 22 and the projection 44 of the movable bracket 6, it is possible to set the strength for restricting the relative rotation of the brackets 6 and 12 around the connecting shaft 22.

Further, it is only necessary to provide the protrusion 44 that is extremely easy to form and the protrusion engaging portion 45 that engages with the protrusion 44, and the cost is low. Further, since the protrusions 44 and the protrusion engaging portions 45 are formed integrally with the corresponding movable bracket 6 and holding bracket 12, the number of parts can be reduced and the cost can be reduced.
In addition, since the protrusion engaging portions 45 are provided at the front end edge portion 46 and the rear end edge portion 47 of each connection shaft insertion hole 24 of the side plates 13 and 14 of the holding bracket 12, the protrusion 44 is inserted into the connection shaft insertion hole 24. It can arrange | position and can prevent that an apparatus enlarges. In addition, the relative rotation of the movable bracket 6 and the holding bracket 12 around the connecting shaft 22 can be restricted in any rotation direction. Accordingly, it is possible to prevent the brackets 6 and 12 from rotating relative to each other when the tilt steering device 1 is transported and the like, and to prevent the position shift between the brackets 6 and 12 when assembled to the vehicle body 11. The trouble of repairing can be saved.

Furthermore, by forming the protrusion engaging portion 45 in an arc shape, even if the position of the protrusion 44 with respect to the protrusion engaging portion 45 is changed by tilt adjustment, the relative rotation about the connecting shaft 22 of both brackets 6 and 12 is achieved. Can be reliably prevented.
In the above embodiment, the movable bracket 6 may be the second bracket and the holding bracket 12 may be the first bracket. In this case, the connecting shaft insertion hole 24 and the protrusion engaging portion 45 are provided in the movable bracket 6, and the connecting shaft holding hole 23 and the protrusion 44 are provided in the holding bracket 12.

  FIG. 4 is a side view in which a part of a tilt steering device 50 according to still another embodiment of the present invention is omitted, and FIG. 5 is a perspective view of the movable bracket 6 and the holding bracket 12 of the tilt steering device 50. . In the following, a configuration different from the embodiment shown in FIGS. 1 to 3 will be described, and the same components as those in the embodiment shown in FIGS. .

With reference to FIGS. 4 and 5, the feature of the present embodiment is that protrusions 51 and 52 are integrally formed on the corresponding front end portion 53 and rear end portion 54 of movable bracket 6, and The joining portions 55 and 56 are formed integrally with the corresponding front end edge 57 and rear end edge 58 of the side plates 13 and 14 of the holding bracket 12.
The front end edge 57 and the rear end edge 58 of the side plates 13 and 14 of the holding bracket 12 are each formed in an arc shape corresponding to the shape of the connecting shaft insertion hole 24. That is, each protrusion engaging part 55, 56 is formed in an arc shape corresponding to the shape of the connecting shaft insertion hole 24.

The protrusions 51 are formed by projecting part of the left and right ends of the front end portion 53 of the movable bracket 6 to the outside in the left-right direction A, respectively. The rear end surface 59 of each protrusion 51 is formed in an arc shape corresponding to the shape of the protrusion engaging portion 55, and each protrusion 51 is engaged with the corresponding protrusion engaging portion 55.
The protrusions 52 are formed by projecting part of the left and right ends of the rear end portion 54 of the movable bracket 6 outward in the left-right direction A, respectively. The front end surface 60 of each protrusion 52 is formed in an arc shape corresponding to the shape of the protrusion engaging portion 56, and each protrusion 52 is engaged with the corresponding protrusion engaging portion 56.

With the above configuration, each of the protrusion engaging portions 55 and 56 can guide the relative movement of the corresponding protrusions 51 and 52 during the tilt adjustment.
Referring to FIG. 4, the above-described secondary collision occurs in the tilt steering apparatus 50, and the above-described impact load C is applied toward the front of the vehicle body (in the direction of the white arrow, which is the same direction as the second longitudinal direction S <b> 2). When this occurs, the impact load C is transmitted to the connecting shaft 22 via the movable bracket 6 and the like, and further transmitted to the mounting body 10 via the cam follower 30 and the holding bracket 12 to break the mounting body 10. At this time, the relative rotation of the brackets 6 and 12 around the connecting shaft 22 is restricted by the engagement of the protrusions 51 and 52 of the movable bracket 6 and the corresponding protrusion engaging portions 55 and 56 of the holding bracket 12. Thereby, it is possible to prevent an unnecessary moment load from acting on the holding bracket 12 and to reliably transmit a component related to the sliding direction P in the impact load C to the mounting body 10.

  As described above, according to the present embodiment, the mutual coupling strength of the movable bracket 6 and the holding bracket 12 around the connecting shaft 22 due to the engagement between the protrusions 51 and 52 and the corresponding protrusion engaging portions 55 and 56. Therefore, the relative rotation of the brackets 6 and 12 due to the impact load C can be prevented. Therefore, the component acting in the sliding direction P in the impact load C can be transmitted to the holding bracket 12 well, and the holding bracket 12 can be reliably slid in the sliding direction P to exert the shock absorbing function.

That is, the impact load C can be successfully used as the force in the sliding direction P of the holding bracket 12 without applying an unnecessary moment load to the holding bracket 12, and the second shock absorbing mechanism 43 can exhibit a sufficient shock absorbing function. Can do.
In addition, by setting the distance E between the connecting shaft 22 and the protrusions 51 and 52 of the movable bracket 6, the strength for restricting the relative rotation of the brackets 6 and 12 around the connecting shaft 22 is set. Can do.

Further, it is only necessary to provide the protrusions 51 and 52 that are extremely easy to form and the protrusion engaging portions 55 and 56 that are engaged with the protrusions 51 and 52, and the cost is low. Furthermore, since the protrusions 51 and 52 and the protrusion engaging portions 55 and 56 are formed integrally with the corresponding movable bracket 6 and holding bracket 12, the number of parts can be reduced and the cost can be reduced.
Further, by engaging the corresponding protrusions 51 and 52 with the protrusion engaging portions 55 and 56, the relative rotation of the movable bracket 6 and the holding bracket 12 around the connecting shaft 22 can be performed in any rotation direction. Can be regulated. This prevents the brackets 6 and 12 from rotating relative to each other when the tilt steering device 50 is transported and the like, thereby preventing the position of the brackets 6 and 12 from being displaced. The trouble of correcting the shift can be saved.

Further, by forming the protrusion engaging portions 55 and 56 in an arc shape, even if the positions of the protrusions 51 and 52 corresponding to the protrusion engaging portions 55 and 56 are changed by tilt adjustment, both the brackets 6 and 12 are used. Relative rotation about the connecting shaft 22 can be reliably prevented.
In the embodiment shown in FIGS. 4 and 5, the movable bracket 6 may be the second bracket and the holding bracket 12 may be the first bracket. In this case, protrusion engaging portions 55 and 56 are provided on the front edge 61 and the rear edge 62 of the side plates 7 and 8 of the movable bracket 6, and the front and rear ends of the side plates 13 and 14 of the holding bracket 12. Protrusions 51 and 52 are provided on the part.

Furthermore, in each said embodiment, the structure which provides only any one of each processus | protrusion 51,52 and the processus | protrusion engaging part 55,56 corresponding to this may be sufficient.
The present invention is not limited to the contents of the above-described embodiment, and various modifications can be made within the scope of the claims.

It is the side view which omitted a part of tilt steering device of one embodiment of the present invention. It is a partial cross section figure which follows the II-II line | wire of FIG. It is a perspective view of a movable bracket. It is the side view which abbreviate | omitted a part of tilt steering apparatus of further another embodiment of this invention. FIG. 10 is a perspective view of a movable bracket and a holding bracket of a tilt steering device according to still another embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tilt steering apparatus 4 Steering column 6 Movable bracket (1st bracket, 2nd bracket)
7 Side plate 8 Side plate 11 Car body 12 Holding bracket (second bracket, first bracket)
13 Side plate 14 Side plate 22 Connection shaft 24 Connection shaft insertion hole 44 Projection 45 Projection engagement portion 46 Front end edge (edge)
47 Rear edge (edge)
50 Tilt steering device 51 Projection 52 Projection 55 Projection engagement portion 56 Projection engagement portion 57 Front end edge (edge)
58 Rear edge (edge)
61 Front edge (edge)
62 Rear edge (edge)
C Impact load F Predetermined holding force S2 Second longitudinal direction P Slide direction (predetermined slide direction)

Claims (4)

One of the first and second brackets, one of which is held on the vehicle body with a predetermined holding force and the other is fixed to the steering column, and the side plate of these first and second brackets are connected so as to be adjustable in tilt. A tilt steering device including a shaft, and a bracket held on the vehicle body that slides in a predetermined sliding direction with respect to the vehicle body by receiving an impact load exceeding the predetermined holding force;
The bracket fixed to the steering column includes a side plate having a lower end connected to the steering column,
A protrusion integrally formed with the first bracket;
A protrusion engaging portion formed integrally with the second bracket;
By the engagement of the protrusion and the protrusion engaging portion, the relative rotation of the first and second brackets around the connecting shaft is restricted ,
The tilt steering device according to claim 1, wherein the protrusion engaging portion includes an edge portion of a longitudinally circular arc-shaped connecting shaft insertion hole formed in a side plate of the second bracket .   The first and second brackets, one of which is held on the vehicle body with a predetermined holding force and the other is fixed to the steering column, and the side plates of the first and second brackets are connected so as to be adjustable in tilt. A tilt steering device including a shaft, and a bracket held on the vehicle body that slides in a predetermined sliding direction with respect to the vehicle body by receiving an impact load exceeding the predetermined holding force;
  The bracket fixed to the steering column includes a side plate having a lower end connected to the steering column,
  A protrusion integrally formed with the first bracket;
  A protrusion engaging portion formed integrally with the second bracket;
  By the engagement of the protrusion and the protrusion engaging portion, the relative rotation of the first and second brackets around the connecting shaft is restricted,
  The tilt steering device according to claim 1, wherein the protrusion engaging portion is formed in an arc shape capable of guiding the relative movement of the protrusion during tilt adjustment. The first bracket according to claim 1 or 2, wherein the first bracket is a bracket fixed to the steering column.
The bracket fixed to the steering column includes a pair of side plates each having a lower end connected to the steering column, and an upper plate connecting the upper ends of the pair of side plates,
The tilt steering device according to claim 1, wherein the protrusion is integrally formed with the upper plate and extends laterally from the upper plate. 3. The tilt steering device according to claim 2, wherein the protrusion engaging portion includes an edge portion of a side plate of the second bracket.

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