JP5835610B2 - Position adjustment type steering device - Google Patents

Description

  The present invention relates to a position-adjustable steering apparatus.

There is an electric position adjustment type steering device that adjusts the height position of a steering wheel by swinging a steering column supported so as to be swingable around a tilt center by an electric motor.
For example, in Patent Document 1, the lower end of the steering column is supported by the vehicle body so as to be swingable about the tilt center. In addition, the upper part of the steering column tilts and tilts in an electric box that is swingably supported by the fixed bracket. Specifically, an adjustment nut fixed to the steering column is screwed onto a screw shaft that is rotatably supported by the electric box and is not movable in the axial direction. When the screw shaft is rotationally driven by the electric motor, the adjustment nut moves in the vertical direction, and the steering column tilts.

JP 2000-2503 A

  The steering column during tilt tilt draws an arc locus centered on the tilt center, whereas the adjustment nut on the screw shaft draws a linear locus on the center axis of the screw shaft. Because of this trajectory difference, as in Patent Document 1, when the distance between the tilt center and the adjustment nut is constant, the load torque of the electric motor during tilt driving increases, and the electric motor There is a risk of enlargement.

Therefore, in order to absorb the trajectory difference, it is conceivable that the lower tube of the steering column is composed of a pair of tubes that are fitted so as to freely slide relative to each other in accordance with the tilt adjustment. However, even in that case, the load on the electric motor may increase due to the influence of the frictional force generated between the tubes during tilt adjustment.
Accordingly, an object of the present invention is to provide a position-adjustable steering device that can achieve downsizing of an electric motor.

In order to achieve the above-mentioned object, the invention of claim 1 is directed to support a bracket (15) fixed to the vehicle body (12) and a steering shaft (5) in a rotatable manner around a tilt center axis (CC). A steering column (6; 6A) supported in a swingable manner, and a coupling mechanism (16) for coupling the fixed bracket and the steering column, the coupling mechanism being disposed on the steering column and the tilt center axis line; A swinging member (17; 17B) connected so as to be swingable around a parallel first axis (C1), and around the first axis as the swinging member swings by the swinging member. A first member (18; 19B) supported so as to be swingable and a second member (19) supported so as to be swingable around a second axis (C2) parallel to the tilt center axis by the fixed bracket. 1 B), and either one or the other of the first member and the second member is fitted on a common axis (K1) orthogonal to both the first axis and the second axis and is electrically operated. A screw shaft and a nut that achieve tilt adjustment with relative rotation by driving the motor, and a first restricting member (43, 45, 48) that restricts movement of the first member relative to the swing member on the common axis. 66) and a second restriction member (22; 73, 75, 78) for restricting movement of the second member relative to the fixed bracket on the common axis , the first restriction member and the second restriction member. Any one of the restricting members is fitted on the screw shaft and a thrust bearing (43; 73) and a radial bearing (45; 75) which are arranged separately on the common axis and support the screw shaft. The thrust bearing And it provides a position adjustable steering device including a; (78 48) (1) Preliminary the tightening nut to impart a preload to the radial bearing.

In addition, although the alphanumeric character in a parenthesis represents the corresponding component etc. in embodiment mentioned later, this does not mean that this invention should be limited to those embodiment as a matter of course. The same applies hereinafter.
According to a second aspect of the present invention, the steering column includes a lower tube (9; 9A), and the connection mechanism is connected to a side portion of the lower tube through the swinging member. A support shaft (21), and a second support shaft (22) that is inserted through the fixed bracket and connected to a side portion of the second member, wherein the first axis line of the first support shaft It may be a central axis, and the second axis may be the central axis of the second support shaft.

  According to a third aspect of the present invention, the lower tube includes a first tube (101) to which the first support shaft is connected, and a second tube (102) fitted to the lower end of the first tube. In the event of a vehicle collision, the first tube may slide against the second tube to absorb the impact.

According to the first aspect of the present invention, the first member and the second member (one of the screw shaft and the nut and the other) for achieving the tilt adjustment are respectively the first axis and the second parallel to the tilt center axis. Since it can swing around two axes, even if the distance between the first axis and the second axis is varied along with the tilt adjustment, the distance between the tilt center axis and the first axis is kept constant. . Therefore, it is not necessary to provide a mechanism for freely sliding, for example, between the column tubes below the first axis of the steering column in the axial direction. As a result, the structure can be simplified, and since there is no friction due to relative sliding between the column tubes during tilt adjustment, the load on the electric motor can be reduced and the electric motor can be downsized.
Further, by applying a preload to the thrust bearing and the radial bearing with the tightening nut, it is possible to suppress backlash in the axial direction and the radial direction of the screw shaft.

According to the invention of claim 2, the first support shaft inserted through the swing member and connected to the side portion of the lower tube, and the second support shaft connected to the side portion of the second member through the fixing bracket. With this simple structure, the swing structure around the first axis and the swing structure around the second axis can be easily realized.
According to the invention of claim 3, in the steering column, the lower tube having a portion extending downward in the axial direction from the first support shaft is divided into the first tube and the second tube, so that the lower tube is at the time of a vehicle collision. Therefore, the degree of freedom in design can be improved. The first tube and the second tube do not need to be slid relative to each other at the time of tilt adjustment, and there is no risk of friction due to the relative sliding, so there is no possibility of increasing the load on the electric motor.

It is a mimetic diagram of a schematic structure of a position adjustment type steering device of one embodiment of the present invention. It is a schematic sectional drawing of the principal part of a position adjustment type steering apparatus. FIG. 3 is a schematic cross-sectional view from a different angle of the main part of the position-adjustable steering device, as viewed from a different angle from FIG. 2. It is a schematic diagram of schematic structure of the position adjustment type steering apparatus of another embodiment of this invention. It is a mimetic diagram of a schematic structure of a position adjustment type steering device of another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a schematic configuration of a position-adjustable steering apparatus 1 according to an embodiment of the present invention. Referring to FIG. 1, a position-adjustable steering apparatus 1 includes a steering member 2 such as a steering wheel, a steering mechanism 3 such as a rack and pinion mechanism, and a steering member 2 connected to one end. Is provided to the steering mechanism 3 via the intermediate shaft 4 and the like, and a cylindrical steering column 6 that rotatably supports the steering shaft 5 via a bearing (not shown).

  The steering column 6 includes an upper tube 7, an intermediate tube 8 fitted to the outer periphery of the upper tube 7, and a housing 10 integrally formed with a lower tube 9 fitted to the outer periphery of the intermediate tube 8. . The position adjustment type steering apparatus 1 has a steering assist mechanism (not shown). The housing 10 accommodates a transmission mechanism (not shown) such as a worm gear mechanism for transmitting the power of the electric motor (not shown) of the steering assist mechanism to the steering shaft 4.

The position-adjustable steering device 1 has an electric tilt function for adjusting the tilt of the position of the steering member 2. The position-adjustable steering device 1 has an electric telescopic function for telescopic adjustment of the position of the steering member 2, but the illustration of the configuration of the electric telescopic function is omitted.
A lower portion of the steering column 6 in the axial direction X1 is supported so as to be swingable around the tilt center axis CC. A stay 11 as a supported portion extending from the housing 10 of the steering column 6 is supported by a fixed bracket 13 fixed to the vehicle body 12 so as to be swingable via a pivot shaft 14. The center axis of the pivot shaft 14 is the tilt center axis CC.

  An intermediate portion in the axial direction X1 of the steering column 6 is connected to a fixing bracket 15 fixed to the vehicle body 12 via a connecting mechanism 16. The coupling mechanism 16 includes a swing member 17, a screw shaft 18 as a first member, and a nut 19 as a second member screwed to the screw shaft 18. The screw shaft 18 as the first member and the nut 19 as the second member are screwed on the common axis K1. In the side view shown in FIG. 1, the common axis K <b> 1 extends in a direction intersecting with the axial direction X <b> 1 of the steering column 6.

The swing member 17 is connected to the steering column 6 so as to be swingable about a first axis C1 parallel to the tilt center axis CC. The first axis C <b> 1 corresponds to the central axis of the first support shaft 21 that is inserted through the swing member 17 and is attached to both sides of the lower tube 9 of the steering column 6.
The first support shaft 21 is screwed into a screw hole of the swing member 20 and is configured by a bolt or the like in which a round shaft portion at the tip is fitted into a supported hole provided on both sides of the lower tube 9. Yes. The swing member 17 is connected to the lower tube 9 via the first support shaft 21 so as to be swingable.

The screw shaft 18 as the first member is supported by the swing member 17 so as to be rotatable around the common axis K1 and not movable in the axial direction. The screw shaft 18 can swing around the first axis C <b> 1 together with the swing member 17 as the swing member 17 swings. Further, the movement of the screw shaft 18 on the common axis K1 with respect to the swing member 17 is restricted.
The nut 19 as the second member is supported by the fixed bracket 15 so as to be swingable around a second axis C2 parallel to the tilt center axis CC. The second axis C2 corresponds to the central axis of the second support shaft 22 attached to the fixed bracket 15.

The second support shaft 22 is screwed into a pair of screw holes provided in the fixed bracket 15 and passes through the fixed bracket 15, and a bolt in which a round shaft portion at the tip is inserted into the supported holes on both sides of the nut 19. Etc. The nut 19 is swingably connected to the fixed bracket 15 via the second support shaft 22.
The rotation of the nut 19 around the common axis K <b> 1 is restricted by the second support shaft 22. The second support shaft 22 functions as a second restricting member that restricts the movement of the nut 19 on the common axis K <b> 1 with respect to the fixed bracket 15.

  The electric tilt function of the position-adjustable steering apparatus 1 is achieved as follows. That is, the rotational driving force of the electric motor 23 fixed to the lower tube 9 of the steering column 6 is supported by the switching mechanism 24 fixed to the lower tube 9, the flexible power transmission tube 25, and the swing member 17. The screw shaft 18 is transmitted to the screw shaft 18 through the speed reduction mechanism 25 in order, and the screw shaft 18 is rotationally driven. Thus, when the screw shaft 18 rotates, the screw shaft 18 moves on the common axis K1 with respect to the nut 19, and the distance between the first support shaft 21 and the second support shaft 22 (the first axis C1 and the first shaft C1). Corresponding to the distance from the biaxial line C2). Thereby, the tilt angle of the steering column 6 is adjusted, and tilt adjustment is achieved.

The switching mechanism 24 has a function of selectively switching whether the driving force of the electric motor 23 is transmitted to the screw shaft 18 side that achieves the electric tilt function or to the mechanism side that achieves the electric telescopic function (not shown). Fulfill.
The speed reduction mechanism 25 includes a drive gear 26 that is rotatably supported by the swing member 17 and a driven gear 27 that is connected to an intermediate portion in the axial direction of the screw shaft 18 so as to be integrally rotatable. As the driving gear 26 and the driven gear 27, for example, a pair of bevel gear mechanisms that mesh with each other may be used.

As shown in FIG. 2, the fixing bracket 15 connects between the top plate 28 fixed to the vehicle body 12, a pair of side plates 29 and 30 extending downward from the top plate 28, and the lower ends of the pair of side plates 29 and 30. And a bottom plate 31. The lower tube 9 of the steering column 6 is inserted between the side plates 29 and 30 of the fixed bracket 15.
The nut 19 as the second member has a pair of flat side portions 191 and 192. One side 191 of the nut 19 faces the end surface of the boss 32 provided on the one side plate 29 of the fixed bracket 15. The other side 192 of the nut 19 faces the end surface of the boss 33 provided on the bottom plate 31 of the fixing bracket 15.

The second support shaft 22 is constituted by a bolt having a screw portion 22a screwed into a screw hole 34 provided in each boss 32, 33, and a round shaft portion 22b extending from the screw shaft 22a to the distal end side. Round shaft portions 22 b that pass through the bosses 32 and 33 are inserted into supported holes 35 provided on both side portions 191 and 192 of the nut 19.
A bush 36 is fitted between the outer periphery of the round shaft portion 22 b and the inner periphery of the supported hole 35. Thus, the nut 19 is connected to the fixed bracket 15 via the bush 36 and the second support shaft 22 so as to be swingable around the second support shaft 22 (around the second axis C2). Since the flange 36a provided at one end of the bush 36 is interposed between each side portion 191 of the nut 19 and the end face of the corresponding boss 32, 33, the rotational resistance of the nut 19 with respect to the second support shaft 22 is reduced. As a result, the nut 19 can be smoothly rotated around the second axis C2.

  The swing member 17 includes a main body portion 37 that supports the screw shaft 18, and a pair of side plates 38 and 39 that extend from both side portions of the main body portion 37 toward the corresponding side portions 91 and 92 of the lower tube 9. Yes. Screw holes 40 are formed in the side plates 38 and 39, and supported holes 41 are formed in the side portions 91 and 92 of the lower tube 9. The first support shaft 21 is screwed into the screw holes 40 of the side plates 38 and 39, and extends from the screw portions 21 a to the distal end side, and into the supported holes 41 of the corresponding side portions 91 and 92 of the lower tube 9. It is comprised with the volt | bolt which has the round shaft part 21b fitted.

  An insertion hole 42 extending in the direction in which the screw shaft 18 extends (the direction of the common axis K1) is formed in the main body portion 37 of the swing member 17. The insertion hole 42 has a small-diameter bearing holding portion 44 that holds a thrust bearing 43 such as a thrust ball bearing for supporting the screw shaft 18 in the thrust direction, a radial ball bearing for rotatably supporting the screw shaft 18, and the like. And a large-diameter driven gear accommodating portion 47 for accommodating a driven gear 27 that rotates integrally with the screw shaft 18.

  A thin shaft portion 183 is extended to one end 181 of the screw shaft 18, and a tightening nut 48 is fitted to a screw portion on the outer periphery of the thin shaft portion 183. Further, the other end 182 of the screw shaft 18 is fitted to the nut 19 for tilting. The tightening nut 48 presses the thrust bearing 43 against the positioning step portion 50 provided at the end of the bearing holding portion 44 via the washer 49. A round shaft portion 51 provided in the middle portion of the screw shaft 18 is fitted to an inner ring 52 of the radial bearing 45 so as to be integrally rotatable. The outer ring 53 of the radial bearing 45 is press-fitted into the inner periphery of the bearing holding portion 46.

  The outer ring 53 of the radial bearing 45 is in contact with a positioning step portion 54 provided at the end of the bearing holding portion 46. Thereby, the axial movement of the outer ring 53 upward (to the thrust bearing 43 side) in FIG. 2 is restricted. On the other hand, the inner ring 52 is in contact with a positioning step portion 55 provided adjacent to the round shaft portion 51 of the screw shaft 18. Thereby, the axial movement of the inner ring 52 downward (to the driven gear 27 side) in FIG. 2 is restricted.

Therefore, according to the tightening of the tightening nut 48, the thrust bearing 43 and the radial bearing 45 receive a force in a direction approaching each other via the screw shaft 18. Thereby, a predetermined portion of the swing member 17 (corresponding to the annular protrusion 42a formed between the bearing holding portions 44 and 46 in the inner periphery of the insertion hole 42) interposed between the both bearings 43 and 45 is the both bearings. Since it is clamped between 43 and 45, the axial movement of the screw shaft 18 is restricted. That is, the tightening nut 48, the thrust bearing 43 and radial bearing 45, for swinging member 17, which functions as a first regulating member for regulating the movement of on a common axis K1 of the screw shaft 18.

In addition, since a predetermined preload is applied to both the bearings 43 and 45 according to the tightening of the tightening nut 48, the axial and radial play of the screw shaft 18 with respect to the swing member 17 is suppressed. The
Further, a serration portion 56 provided in the middle portion of the screw shaft 18 is press-fitted to the inner periphery of the driven gear 27 so as to be integrally rotatable. A lower portion of the driven gear accommodating portion 47 of the insertion hole 42 of the main body portion 17 is closed by a cover 57. The screw shaft 18 is inserted through an insertion hole 58 provided in the cover 57.

As shown in FIG. 3, which is a cross-sectional view of the main part of the position-adjustable steering device 1 from an angle different from that of FIGS. Is inserted.
Referring to FIG. 3, the main body portion 17 of the swing member 17 includes an extending tube 60 extending in a direction intersecting with a direction in which the insertion hole 42 through which the screw shaft 18 is inserted (direction of the common axis K <b> 1). Provided. A drive gear 26 that meshes with the driven gear 27 and a support shaft 61 of the drive gear 26 are accommodated in the extended cylinder 60. A lid member 62 is fixed to the opening end of the extended cylinder 60.

A support shaft 61 is rotatably supported via a bush 64 by a cylindrical portion 63 extending from the lid member 62. Further, the end portion of the support shaft 61 faces the outside from the opening of the lid member 62. A connecting hole 65 is provided at an end portion of the support shaft 61, and an end portion of a flexible power transmission tube Tu is connected to the connecting portion 65 so that power can be transmitted.
According to this embodiment, the screw shaft 18 (first member) and the nut 19 (second member) for achieving tilt adjustment are respectively the first axis C1 and the second axis C2 that are parallel to the tilt center axis CC. Therefore, even if the distance between the first axis C1 and the second axis C2 is varied along with the tilt adjustment, the distance D1 between the tilt center axis CC and the first axis C1 (FIG. 1). Is maintained constant.

  Therefore, a conventionally used mechanism for freely sliding relative to each other, for example, between the column tubes, can be eliminated below the first axis C1 of the steering column 6 in the axial direction X1. That is, since it is sufficient to use a single lower tube 9 that does not expand and contract, the structure can be simplified. In addition, since the friction caused by the relative sliding at the time of tilt adjustment can be eliminated, the load on the electric motor 23 can be reduced and the electric motor 23 can be downsized.

Further, the first support shaft 21 inserted through the swing member 17 and connected to the side portions 91 and 92 of the lower tube 9 and the fixing bracket 15 are inserted into the side portions 191 and 192 of the nut 19 (second member). With a simple structure using the connected second support shaft 22, a swing structure around the first axis C1 and a swing structure around the second axis C2 can be easily realized.
Next, FIG. 4 is a schematic diagram of a schematic configuration of a position-adjustable steering apparatus 1A according to another embodiment of the present invention. This embodiment is mainly different from the embodiment of FIG. 1 as follows. That is, the lower tube 9A of the steering column 6A is fitted to the first column tube 101 to which the first support shaft 21 is connected and the lower end of the first column tube 101, and the second column is formed integrally with the housing 10A. The tube 102 is comprised.

  The two column tubes 101 and 102 are press-fitted with a predetermined press-fit load so that they cannot normally slide relative to each other, and the first column tube 101 slides relative to the second column tube 102 when the vehicle collides. To absorb the shock. In the constituent elements of the present embodiment, the same constituent elements as those of the embodiment of FIG. 1 are denoted by the same reference numerals as those of the constituent elements of the embodiment of FIG.

  According to the present embodiment, in the steering column 6A, the lower tube 9A having a portion extending in the axial direction below the first support shaft 21 is divided into the first tube 101 and the second tube 102, whereby the lower tube is obtained. Since 9A can be used for shock absorption at the time of a vehicle collision, the degree of freedom in design can be improved. In addition, the first tube 101 and the second tube 102 do not need to be slid relative to each other at the time of tilt adjustment, and there is no risk of friction caused by the relative sliding, so there is no risk of increasing the load on the electric motor 23.

  Next, FIG. 5 is a cross-sectional view of a main part of a position-adjustable steering apparatus 1B according to still another embodiment of the present invention. In each embodiment shown in FIGS. 1 and 4, the first member supported by the swing member 17 is the screw shaft 18, and the second member supported by the fixing bracket 15 is the nut 19. In contrast, in the present embodiment, the first member supported by the swinging member 17B is the nut 19B, and the second member supported by the fixing bracket 15 is the screw shaft 18B.

Specifically, a nut 19B as a first member is fixed to the swinging member 17B by, for example, a welding portion 66. The other end 182 of a screw shaft 18B as a second member is screwed into the nut 17B. The welding portion 66 functions as a first restricting member that restricts movement of the nut 19B (first member) on the common axis K1 with respect to the swing member 17B.
A support member 67 is supported by the support shaft 22 screwed into the screw hole 34 of each boss 32, 33 so as to be rotatable around the second axis C2. One end 181 of a screw shaft 18B as a second member is supported on the support member 67 so as to be rotatable and immovable in the axial direction. Supported holes 68 are formed in both side portions 671 and 672 of the support member 67. In the supported hole 68, the round shaft portion 22b of the support shaft 22 to which the bush 36 is fitted is inserted.

  The support member 67 is formed with an insertion hole 72 extending in the direction in which the screw shaft 18B extends (the direction of the common axis K1). The insertion hole 72 has a small-diameter bearing holding portion 74 holding a thrust bearing 73 such as a thrust ball bearing for supporting the screw shaft 18B in the thrust direction, a radial ball bearing for rotatably supporting the screw shaft 18B, and the like. And a medium-diameter bearing holding portion 76 holding the radial bearing 75.

  A tightening nut 78 is fitted to the outer thread portion of the narrow shaft portion 183 of the one end 181 of the screw shaft 18B. The tightening nut 78 presses the thrust bearing 73 against the positioning step portion 50 provided at the end of the bearing holding portion 74 via the washer 79. A round shaft portion 51 provided in the middle portion of the screw shaft 18B is fitted to an inner ring 82 of the radial bearing 75 so as to be integrally rotatable. The outer ring 83 of the radial bearing 75 is press-fitted into the inner periphery of the bearing holding portion 76.

  The outer ring 83 of the radial bearing 75 is in contact with a positioning step portion 84 provided at the end of the bearing holding portion 76. Thereby, the axial movement of the outer ring 83 downward (to the thrust bearing 73 side) in FIG. 4 is restricted. On the other hand, the inner ring 82 is in contact with a positioning step portion 55 provided adjacent to the round shaft portion 51 of the screw shaft 18B. Thereby, the axial movement of the inner ring 82 upward (to the driven gear 27 side) in FIG. 4 is restricted.

Therefore, according to the tightening of the tightening nut 78, the thrust bearing 73 and the radial bearing 75 receive a force in a direction approaching each other via the screw shaft 18B. Accordingly, a predetermined portion of the support member 67 (corresponding to the annular protrusion 72 a formed between the bearing holding portions 74 and 76 in the inner periphery of the insertion hole 72) interposed between the both bearings 73 and 75 is the both bearings 73. , 75, the axial movement of the screw shaft 18B is restricted. That is, the tightening nut 78, the thrust bearing 73 and radial bearing 75, to the support member 67, which functions as the second regulating member for regulating the movement of on a common axis K1 of the screw shaft 18B (second member).

In the embodiment of FIG. 5 as well, as with the embodiment of FIG. 1, the load on the electric motor can be reduced and the electric motor can be downsized.
The present invention is not limited to each of the above-described embodiments. For example, an electric motor for tilt adjustment and an electric motor for telescopic adjustment may be provided separately. In addition, various modifications can be made within the scope of the claims of the present invention.

  DESCRIPTION OF SYMBOLS 1; 1A; 1B ... Position adjustment type steering device, 2 ... Steering member, 5 ... Steering shaft, 6; 6A ... Steering column, 7 ... Upper tube, 8 ... Intermediate tube, 9; 9A ... Lower tube, 10; Housing, 14 ... Pivot shaft, 15 ... Fixed bracket, 16 ... Connection mechanism, 17; 17B ... Swing member, 18 ... Screw shaft (first member), 18B ... Screw shaft (second member), 19 ... Nut (first) 2 members), 19B ... nuts (first member), 191, 192 ... side portions, 21 ... first support shaft, 22 ... second support shaft (second regulating member), 23 ... electric motor, 24 ... switching mechanism, 25 ... Deceleration mechanism, 26 ... Drive gear, 27 ... Driven gear, 29, 30 ... Side plate, 31 ... Bottom plate, 34 ... Screw hole, 35 ... Supported hole, 36 ... Bush, 37 ... Main part, 38, 39 ... Side plate 40 ... Screw hole 41 ... supported hole, 43 ... thrust bearing (first regulating member), 45 ... radial bearing (first regulating member), 48 ... tightening nut (first regulating member), 66 ... welded portion (first regulating member), 73: Thrust bearing (second regulating member), 75: Radial bearing (second regulating member), 78: Clamping nut (second regulating member), 101: First tube, 102: Second tube, CC: Tilt center axis , C1 ... first axis, C2 ... second axis, K1 ... common axis

Claims (3)

A fixing bracket fixed to the vehicle body,
A steering column that rotatably supports the steering shaft and is supported so as to be swingable around the tilt center axis;
A coupling mechanism that couples the fixed bracket and the steering column,
The coupling mechanism includes a swinging member coupled to the steering column so as to be swingable about a first axis parallel to the tilt center axis, and the swinging member swings with the swinging member. A first member supported to be swingable about the first axis, and a second member supported to be swingable about a second axis parallel to the tilt center axis by the fixing bracket. Including
Either one or the other of the first member and the second member is fitted on a common axis orthogonal to both the first axis and the second axis, and tilts as the motor rotates relative to the first axis. Screw shaft and nut to achieve the adjustment,
A first restricting member that restricts movement of the first member relative to the swing member on the common axis; and a second restricting member that restricts movement of the second member relative to the fixed bracket on the common axis. Bei example,
Any one of the first restriction member and the second restriction member is disposed on the common axis so as to be separated from the thrust bearing and the radial bearing that support the screw shaft, and the screw shaft is fitted to the screw shaft. A position-adjustable steering device including a thrust bearing and a tightening nut for applying a preload to the radial bearing . The steering column according to claim 1, wherein the steering column includes a lower tube,
The coupling mechanism includes a first support shaft that is inserted through the swing member and connected to a side portion of the lower tube, and a first bracket that is connected to the side portion of the second member through the fixed bracket. 2 spindles,
The first axis is a central axis of the first support shaft;
The position-adjustable steering device, wherein the second axis is a central axis of the second support shaft. In Claim 2, the lower tube includes a first tube to which the first support shaft is connected, and a second tube fitted to a lower end of the first tube,
A position-adjustable steering device in which the first tube slides relative to the second tube to absorb an impact when a vehicle collides.

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