JP2007015678A - Vehicular electric position adjustment type steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular electric position adjustment type steering device capable of reliably preventing any play in the axial direction of a screw shaft by suppressing a space between the screw shaft and a nut with a simple configuration. <P>SOLUTION: The vehicular electric position adjustment type steering device for performing the position adjustment of a steering column 1 by an electric motor 19 comprises a supporting unit 12 having a through hole 12a formed in the steering column 1 in a projecting manner, nut parts 13A, 13B which are rotatably restricted to an end of the through hole 12a of the supporting unit 12, and a screw shaft 15 which is screwed to the nut parts 13A, 13B through the through hole 12a and rotated by the electric motor. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric position adjusting type steering device for a vehicle in which a steering column is tilted or expanded / contracted by an electric motor.

In this type of vehicle position-adjustable steering device, for example, a tilt mechanism for tilting the steering column by converting the rotational driving force of the electric motor into linear motion is provided on one side of the steering column. There is known a vehicle electric tilt type steering device provided with a slide portion for sliding the steering column at the time of tilt tilt on the other side of the steering column (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-2503 (first page, FIGS. 1 and 4)

However, in the conventional example described in Patent Document 1, since the tilt mechanism part and the slide part are provided with the steering column interposed therebetween, the screw shaft constituting the tilt mechanism part and the adjusting nut screwed to the screw shaft are provided. It is possible to increase the rigidity by securely engaging each other and securely preventing the steering wheel from rattling in the vertical direction without requiring screw precision control. However, when the gap between the screw shaft and the adjustment nut is large, there is an unsolved problem that play occurs in the screw shaft direction, that is, in the vertical direction of the steering wheel. For this reason, increasing the accuracy of the screw shaft and the adjustment nut and reducing the gap between them will lead to an increase in cost, and if the contact between the screw shaft and the adjustment nut becomes stronger due to assembly errors, the operation will be reduced. There is an unsolved problem such as an increase in load on the electric motor or an increase in operation noise.
Accordingly, the present invention has been made paying attention to the above-mentioned unsolved problems of the conventional example, and with a simple configuration, the gap between the screw shaft and the nut is suppressed to reliably prevent the axial play of the screw shaft. It is an object of the present invention to provide an electric position adjustment type steering device for a vehicle that can be used.

  In order to achieve the above object, a vehicle electric position adjustment type steering apparatus according to claim 1 is a vehicle electric position adjustment type steering apparatus that adjusts the position of a steering column by an electric motor, and is formed to project from the steering column. A support portion having an insertion hole; a nut portion that is rotationally restrained at an end portion of the insertion hole of the support portion and provided with a preload; and is screwed into the female screw hole and the nut portion of the support portion. And a screw shaft that is rotationally driven by an electric motor.

According to a second aspect of the present invention, there is provided the vehicle electric position adjusting type steering apparatus according to the first aspect of the invention, wherein an internal thread that is screwed into the screw shaft is formed on the inner peripheral surface of the insertion hole of the support portion. It is characterized by being.
Furthermore, the vehicle electric position adjustment type steering apparatus according to claim 3 is a vehicle electric position adjustment type steering apparatus that adjusts the position of the steering column by an electric motor, and has a support portion that has an insertion hole that protrudes from the steering column. And a pair of nut portions arranged to be rotationally restrained at both ends of the insertion hole of the support portion, and a screw that is screwed into the pair of nut portions through the insertion hole and rotated by the electric motor. It is characterized by having a shaft.

Furthermore, the vehicle electric position adjusting type steering apparatus according to claim 4 is the invention according to any one of claims 1 to 3, wherein a sliding member is inserted between the support portion and the nut portion. It is characterized by being.
Still further, according to a fifth aspect of the electric position adjusting type steering apparatus for a vehicle according to the fifth aspect, in the invention according to any one of the first to fourth aspects, the nut portion is accommodated in a nut accommodating portion formed in the support portion. A pin fitting portion for fitting a positioning pin to one of the nut housing portion and the nut portion is formed, and a side wall facing the pin fitting portion is formed on the other, and the positioning pin is fitted to the pin The nut portion is configured to be rotationally restrained by press-fitting between the portion and the side wall.

  According to a sixth aspect of the present invention, there is provided a vehicle electric position adjustment type steering apparatus according to any one of the first to fifth aspects, wherein the positioning pin is inserted into one of the nut portion and the support surface end portion. A pin locking portion that locks the positioning pin inserted through the pin insertion portion, and the positioning pin is inserted through the pin insertion portion and locked to the pin locking portion. By doing so, the nut portion is configured to be rotationally restrained.

Furthermore, the vehicle electric position adjusting type steering apparatus according to claim 7 is the invention according to claim 6, wherein the pin insertion portion is formed by an engagement recess formed in an outer peripheral surface of the nut portion, and The stop portion is formed by a pin fitting groove for fitting a pin formed on the end surface of the support portion.
Furthermore, in the vehicle electric position adjusting type steering apparatus according to claim 8, in the invention according to claim 6 or 7, one of the pin insertion portion and the pin locking portion is equally spaced in the circumferential direction. The other is formed at a plurality of unequal intervals different from the equal intervals in the circumferential direction.

Still further, according to a ninth aspect of the present invention, there is provided the vehicle electric position adjustment type steering apparatus according to any one of the first to eighth aspects, wherein the support portion is extended in a direction intersecting an axial direction of the steering column. The steering column is tilted by the rotation of the screw shaft.
According to a tenth aspect of the present invention, there is provided the vehicle electric position-adjustable steering apparatus according to any one of the first to eighth aspects, wherein the support portion is extended in a direction along an axial direction of the steering column, The steering column is configured to expand and contract by rotation of a screw shaft.

According to the present invention, the nut portion that is screwed to the screw shaft is rotationally restrained in a state where a preload is applied to the end portion of the support portion that has an insertion hole that is formed to protrude from the steering column. Even if is used, it is possible to reliably prevent the axial play of the screw shaft from occurring.
According to the present invention, since the pair of nut portions are rotationally restrained and arranged at both ends of the support portion having an insertion hole protruding from the steering column, and both nut portions are screwed to the screw shaft, at least one nut portion By tightening, a preload can be applied between the screw shaft and the nut portion, and it is possible to reliably prevent backlash in the axial direction of the screw shaft even if the screw shaft and nut portion with poor accuracy are used. The effect that it can be obtained.

  In addition, by inserting a sliding member between the nut part and the support part, it becomes possible to slide between the support part and the nut in the direction intersecting the screw shaft, so that errors during assembly can be absorbed. It is possible to surely prevent an increase in the load on the electric motor and to reliably prevent an increase in operating noise.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram showing a first embodiment when the present invention is applied to an electric tilt steering apparatus for a vehicle as an electric position adjusting type steering apparatus for a vehicle and is mounted on an actual vehicle. FIG. FIG. 3 is a side view with a cross section of a part of the electric tilt steering apparatus for a vehicle shown in FIG. 3, FIG. 3 is a plan view with a cross section of a part of the electric tilt steering apparatus for a vehicle shown in FIG. FIG. 5 is an enlarged sectional view taken along line BB in FIG. 2, FIG. 6 is an enlarged sectional view taken along line DD in FIG. 4, and FIG. 7 is an enlarged sectional view taken along line CC in FIG. .

In the figure, reference numeral 1 denotes a steering column. A steering shaft 2 is rotatably supported in the steering column 1. An intermediate shaft 4 is connected to a lower end of the steering shaft 2 via a cross shaft 3. Is connected.
As shown in FIG. 1, the intermediate shaft 4 is composed of an inner shaft 4a and an outer shaft 4b that are spline-fitted and extendable and non-rotatable. This allows the steering column 1 to be displaced during a collision or deformation of the vehicle body. In addition to absorbing, the displacement of the steering column 1 is absorbed during tilt tilting.

The lower end of the steering column 1 is supported on the vehicle body by a lower bracket 5 so as to be swingable around the tilt center pin 6.
In the upper part of the steering column 1, an electric box 8 is swingably supported by bolts 9 on an upper bracket 7 attached to the vehicle body. The steering column 1 is tilted automatically in the electric box 8.
As shown in FIG. 4, the electric box 8 is provided with a tilt mechanism portion 10 on the right side of the steering column 1 and a slide portion 11 on the left side of the steering column 1.

  As a structure for the tilt mechanism portion 10, a support portion 12 having an insertion hole 12a penetrating in the vertical direction and having an inner diameter larger than the outer diameter of a screw shaft 15 described later is formed on the right side of the steering column 1. In addition, stepped portions 12b and 12c as nut accommodating portions for accommodating adjustment nuts 13A and 13B as a pair of disc-shaped nut portions are formed on the upper and lower open end surfaces of the insertion hole 12a in the support portion 12. The adjusting nuts 13A and 13B are disposed on the stepped portions 12b and 12c so as to be slidable in the direction orthogonal to the axial direction of the insertion hole 12a via the sliding members 14A and 14B.

A screw shaft 15 passing through the insertion hole 12a is screwed into the adjustment nuts 13A and 13B, and the female screw and the male screw formed on the adjustment nuts 13A and 13B and the screw shaft 15 are constituted by trapezoidal screws. ing.
As shown in FIG. 6, each of the adjusting nuts 13A and 13B has an engaging recess 13a on the outer peripheral surface at equal intervals in the circumferential direction and having a relatively shallow radial depth. A plurality is formed so as to face the side wall 12d forming the portions 12b and 12c.

  Then, by tightening at least one of the adjustment nuts 13A and 13B, a predetermined preload is applied between the adjustment nuts 13A and 13B and the screw shaft 15, and the clearance between the contact surfaces of the female screw and the male screw between them is reduced. In a state where generation is prevented, a diameter larger than the diameter of the inscribed circle inscribed in the space is defined in the space surrounded by the engaging recess 13a of both the adjusting nuts 13A and 13B and the side wall 12d forming the stepped portions 12b and 12c. The positioning pin 13b is press-fitted to prevent the adjustment nuts 13A and 13B from rotating, and the adjustment nuts 13A and 13B are rotationally restrained by the support portion 12.

Further, the upper end and the lower end of the screw shaft 15 are rotatably supported by bearings 16 and 17, respectively. Further, a worm wheel 18 is integrally formed above the screw shaft 15, and the worm 20 connected to the drive shaft of the electric motor 19 is engaged with the worm wheel 18.
Accordingly, when the electric motor 19 is driven, the rotational driving force is transmitted to the screw shaft 15 via the worm 20 and the worm wheel 18, and the screw shaft 15 rotates. As a result, the adjusting nuts 13A and 13B screwed to the screw shaft 15 move in the vertical direction together with the support portion 12 of the steering column 1, and the steering column 1 automatically tilts.

The bearing 16 for the screw shaft 15 is fixed by a fastening bolt 21. By tightening the tightening bolt 21 that has been applied with a locking material and does not loosen to a specified torque, pressure can be applied to the bearings 16 and 17, and the screw shaft 15 can be firmly fixed in the vertical and lateral directions at the upper and lower ends. Can be supported.
On the other hand, as a structure for the slide portion 11, the left side of the steering column 1 is formed flat, and a plate 22 is attached to this flat surface. A flat block 23 is provided between the plate 22 and the flat inner wall of the electric box 8. A roller 25 (needle pin) held by a cage 24 is interposed between the plate 22 and the block 23.

Thereby, when the steering column 1 is tilted, the plate 22 slides on the flat surface of the block 23 via the roller 25, so that the steering column 1 can be smoothly moved in the vertical direction, and the adjustment nuts 13A, It is possible to prevent 13B from being twisted with respect to the screw shaft 15.
A pair of tightening bolts 26 are attached to the flat left wall of the electric box 8 by a pair of lock nuts 27. By tightening these tightening bolts 26 with a specified torque, a right direction is applied to the block 23. Pressure is applied.

The rightward pressurization always presses the steering column 1 and the adjusting nuts 13A and 13B to the right, thereby preventing the tilt mechanism portion 10 and the slide portion 11 from rattling in the left-right direction, and the steering shaft 2 It is possible to prevent the steering wheel (not shown) attached to the backlash in the vertical direction.
When the steering column 1 is tilted up from the tilt intermediate position shown in FIG. 2, as shown in FIG. 9, which is an enlarged sectional view taken along the line EE in FIG. When the portion 10 is moved upward, as shown in FIG. 8, this causes the steering column 1 to rotate upward, for example, by an angle α around the tilt center pin 6 of the lower bracket 5. Thus, the electric box 8 rotates about the port 9 by an angle β. Conversely, when the tilt is lowered, the steering column 1 rotates downward.

During such tilt tilting, the electric box 8 swings around the bolt 9, so that the steering column 1 moves slightly in the front-rear direction of the vehicle. That is, the steering column 1 moves to the rear of the vehicle when the tilt is raised, and moves to the front of the vehicle when the tilt is lowered.
For this reason, as shown in FIG. 3, the support hole 28 at the tip of the steering column 1 is formed in a long hole so that the tilt center pin 6 can be moved in the front-rear direction.

Further, as shown in FIG. 1, the intermediate shaft 4 is composed of an inner shaft 4a and an outer shaft 4b that are spline-fitted so as to be extendable and non-rotatable, and can absorb the displacement of the steering column 1 when tilting. Yes. Since the amount of displacement is small, the intermediate shaft 4 can absorb the displacement even with a rubber coupling or the like.
In the electric position adjustment type steering apparatus configured as described above, when the driver tilts and tilts, when the driver operates a tilt position adjustment switch (not shown), the electric motor 19 is driven, and the rotational driving force thereof is the worm 20 and The screw shaft 15 is transmitted to the screw shaft 15 via the worm wheel 18 and rotated. As a result, the adjusting nuts 13A and 13B screwed to the screw shaft 15 move in the vertical direction together with the support portion 12 of the steering column 1, and the steering column 1 automatically tilts and the tilt angle of the steering column 1 is set as desired. Can be adjusted.

  At the time of tilting, between the adjusting nuts 13A and 13B and the screw shaft 15, as described above, at least one of the adjusting nuts 13A and 13B is tightened to give a preload and the female screws of the adjusting nuts 13A and 13B Since there is no gap between the screw shaft 15 and the male screw, a steering wheel (not shown) attached to the steering shaft 2 in the axial direction of the screw shaft 15, that is, with a simple configuration, has a vertical play. Can be reliably prevented.

In addition, since the plate 22 of the steering column 1 slides on the flat surface of the block 23 via the roller 25 during tilt tilting, the steering column 1 can be smoothly moved up and down, and the adjustment nut 13A , 13B can be prevented from being twisted with respect to the screw shaft 15.
As described above, in the first embodiment, at least one of the adjustment nuts 13A and 13B in a state where the screw shaft 15 is screwed to the adjustment nuts 13A and 13B disposed at both ends of the support portion 12 of the steering column 1. By tightening the screw, a preload is applied between the adjusting nuts 13A and 13B and the screw shaft 15 to surely prevent a gap generated between the female screw of the adjusting nuts 13A and 13B and the male screw of the screw shaft 15. Thus, it is possible to reliably prevent backlash in the axial direction of the screw shaft 15, that is, the vertical direction of the steering wheel.

  Further, since the sliding members 14A and 14B are inserted between the adjusting nuts 13A and 13B and the end surface of the support portion 12, the adjusting nuts 13A and 13B slide in a direction perpendicular to the axial direction of the screw shaft 15. This makes it possible to absorb errors during assembly, prevent the tilting operation from becoming heavy and increase the load on the electric motor 19, and reliably suppress the increase in operating noise. be able to.

Furthermore, a pair of tilt mechanism portions are not provided on both sides of the steering column, but a tilt mechanism portion 10 is provided only on one side of the steering column 1 and a slide portion 11 is provided on the other side of the steering column 1. It is.
Therefore, since one tilt mechanism can be omitted, the number of parts can be reduced, and the manufacturing cost can be reduced.

  Furthermore, the steering column is not suspended by a pair of tilt mechanism portions on both sides thereof, but a tilt mechanism portion 10 is provided only on one side of the steering column 1, and a slide portion 11 is provided on the other side of the steering column 1. It is provided. Therefore, since it is not a suspension structure, not only the vertical rigidity of the steering column 1 but also the lateral rigidity can be made sufficiently large.

In addition, in the first embodiment, the tightening bolt 21 that fixes the bearing 16 of the screw shaft 15 is tightened to a specified torque, so that a pressure can be applied to the bearings 16 and 17, and the screw shaft 15 is connected to the upper end thereof. And it can be firmly supported in the lateral direction at the lower end. Therefore, not only the rigidity in the vertical direction but also the lateral rigidity of the steering column 1 can be made sufficiently large.
Furthermore, in the first embodiment, as shown in FIG. 4, the cross section of the steering column 1 in the electric box 8 is formed with the support portion 12 of the right tilt mechanism portion 10 as the apex and the left slide portion 11 as the top. By forming the base column in a triangular shape, the steering column 1 can be tilted smoothly.

  In the first embodiment, when the adjustment nuts 13A and 13B are prevented from rotating, the engagement recesses 13a formed in the adjustment nuts 13A and 13B and the side walls forming the step portions 12b and 12c are formed. Although the case where the positioning pin 13b larger than the diameter of the inscribed circle of the space to be press-fitted is described, the present invention is not limited to this, and the positioning pin 13b is smaller than the diameter of the inscribed circle. By squeezing the positioning pin 13b in the axial direction during the press-fitting, and expanding the outer diameter, the positioning pin 13b may be pressed into a space formed by the engaging recess 13a and the side walls forming the stepped portions 12b and 12c. .

  Moreover, in the said 1st Embodiment, although the case where adjustment nut 13A, 13B was a disk shape was demonstrated, it is not limited to this, As shown in FIG. A projecting plate portion 13c that can be inserted into the insertion hole 12a is formed on the surface facing the end surface of the support portion 12, and the sliding members 14A and 14B are formed in an L-shaped cross section corresponding thereto, thereby adjusting nuts 13A and 13B. The screw shaft 15 may be configured to be allowed to move in the axial direction and in a direction orthogonal to the axial direction. In this case, the protruding plate portion 13c of the adjusting nuts 13A and 13B can be inserted and held in the insertion hole 12a of the support portion 12 via the sliding members 14A and 14B at the time of assembling, and the assembling work can be easily performed. There is an advantage that can be. Here, the outer diameter of the protruding portion inserted into the insertion hole 12a of the sliding members 14A and 14B can be arbitrarily selected to be the same diameter as the inner diameter of the insertion hole 12a or smaller.

Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, one of the two adjustment nuts 13A and 13B is replaced with a nut portion formed on the support portion 12.
That is, in the second embodiment, as shown in FIG. 11, the adjustment nut 13 </ b> A is omitted in the configuration of FIG. 4 in the first embodiment described above, and the insertion hole 12 a is inserted into the support portion 12 instead. 4 except that a portion corresponding to the adjusting nut 13A is closed and a closing plate portion 12f as a nut portion formed with a female screw 12e screwed with the screw shaft 15 is provided. Portions corresponding to those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof is omitted.

According to the second embodiment, since the support portion 12 itself is screwed to the screw shaft 15 by the female screw 12e of the closing plate portion 12f, by tightening the adjustment nut 13B facing the closing plate portion 12f, It is possible to prevent a gap from being generated between the female screw 12e and the female screw of the adjusting nut 13B and the male screw of the screw shaft 15, and the same effects as those of the first embodiment described above can be obtained.
In the second embodiment, the case where the adjustment nut 13A in the first embodiment is replaced with the closing plate portion 12f has been described. However, the present invention is not limited to this, and the adjustment nut 13B is closed. You may make it replace with the obstruction board part similar to the board part 12f.

  In the first and second embodiments, the positioning nuts 13A and 13B are prevented from being rotated by the positioning pin 13b in the space formed by the engaging recess 13a and the side wall 12d forming the stepped portions 12b and 12c. Although the case of performing by press-fitting has been described, the present invention is not limited to this, and as shown in FIG. 12, the engaging recesses 13a of the adjusting nuts 13A and 13B are formed deep in the radial direction and the circle While the circumferential width is set wider than the diameter of the positioning pin 13b to form the pin insertion portion, the end surface of the support portion 12 has a width narrower than the positioning pin 13b as shown in FIG. 13 and is centered on the center of the insertion hole 12a. The pin fitting groove 12e is formed as an arcuate pin locking portion, and the adjusting nuts 13A and 13B are tightened to fit the positioning pin 13b into the pin fitting groove 12e. When the, by fitting to choose the position of the positioning pin 13b abuts against the side wall in the tightening direction of the engagement recess 13a, the adjustment nut 13A, may be performed detents 13B. In this case, there is an advantage that the adjustment nuts 13A and 13B can be reliably prevented from rotating even when a manufacturing error occurs in the circumferential width of the engaging recess 13a and the diameter of the positioning pin 13b.

  Furthermore, in the said 2nd Embodiment, although the nut part by the internal thread 12e was provided in the end of the insertion hole 12a, and the adjustment nut 13B was provided in the other end, it was not limited to this, As shown in FIG. 14, the support portion 12 is composed of a protruding plate portion 12g formed with a female screw 12e screwed to the screw shaft 15 on the inner peripheral surface of the insertion hole, and a nut accommodating portion 12h formed on the right side thereof. A sliding member 14B is formed on the end surface of the protruding plate portion 12g on the nut accommodating portion 12h side, an adjusting nut 13B screwed to the screw shaft 15 is accommodated in the nut accommodating portion 12h, and a preload is applied by tightening the adjusting nut 13B. In this state, the positioning pin 13b is formed outside the female screw 12e on the end surface on the nut housing portion 12h side of the support portion 12 through the engagement recess 13a as the pin insertion portion of the adjustment nut 13B. May be the pin fitting recess 12j is fitted as down locking portion rotates restrained. In this case, the rotational restraint position of the adjustment nut 13B is determined by the position where the pin fitting recess 12j is formed and the position of the engagement recess 13a formed in the adjustment nut 13B. It is made of a synthetic resin material having moderate elasticity that is easily deformed in the axial direction of the shaft 15, and the positioning member 13b is pin-fitted by elastically deforming the sliding member with the adjustment nut 13B tightened and preload applied. It is preferable to restrain the rotation in a state in which a preload is applied to the adjustment nut 13B by fitting it into the recess 12j. In this case, the tip of the positioning pin 13b is formed in a conical surface that gradually decreases in outer diameter as it goes to the tip, or the pin fitting recess 12j is formed in a conical surface that gradually increases in inner diameter as it goes from the bottom to the end surface. Even if both the positioning pin 13b and the pin fitting recess 12j are formed in a conical surface, even if the circumferential position of the pin fitting recess 12j and the positioning pin 13b is shifted, the adjustment nut 13B is preloaded. It is preferable that the pin fitting recess 12j and the positioning pin 13b can be fitted in a state where the pin is provided.

  Furthermore, in the first and second embodiments, the case where the cross-sectional shape of the steering column 1 in the electric box 8 is formed in a triangular shape has been described. However, the present invention is not limited to this. As shown in FIGS. 15 and 16, a cylindrical steering column 1 is formed, and a support portion 12 having a flat support plate portion 12i is attached to a mounting base 1a formed on the steering column 1, and the support plate portion 12i is provided. It is good also as a structure which arrange | positions the adjustment nuts 13A and 13B screwed together with the screw shaft 15 via the sliding members 14A and 14B on both sides of the insertion hole 12a. Here, the configuration of the support portion 12 and the adjusting nuts 13A and 13B can be the same as the configurations of the first and second embodiments described above.

  Still further, the method of restraining the rotation of the adjusting nuts 13A and 13B with the preload applied to the support portion 12 is not limited to the above, and FIG. 17 is a cross-sectional view taken along the line FF of FIG. As shown in FIG. 18 which is a front view of the above, twelve engagement recesses 13a are formed at equal intervals of, for example, 30 ° on the outer peripheral edges of the adjusting nuts 13A and 13B, and the support portion 12 facing these engagement recesses 13a. For example, three pin fitting recesses 12ja to 12jc are centered on the pin fitting recess 12jb, the angle with the pin fitting recess 12ja is 35 °, and the angle with the pin fitting recess 12jc is 40 °. The pin fitting recesses 12ja to 12jc that coincide with the engagement recess 13a are selected and the positioning pin 13b is inserted through the adjustment nuts 13A and 13B that have been preliminarily applied by tightening the adjusting nuts 13A and 13B. More can rotate constrained while applying a preload adjustment nut 13A, the 13B. In this case, the number and angle of the pin fitting recesses of unequal intervals do not coincide with the equiangular interval of 30 ° of the engagement recesses 13a, and two or more desired numbers can be formed at different angles. Further, contrary to FIGS. 15 to 18, a plurality of pin fitting recesses corresponding to the pin fitting recesses 12ja to 12jc are formed at equal intervals, and a plurality of engagement recesses 13a are formed at unequal intervals. In addition, the pin fitting recesses 12j and 12ja to 12jc may be formed in the adjustment nuts 13A and 13B, and the engagement recess 13a may be formed in the support portion 12. Furthermore, the engaging portion that engages with the positioning pin 13b is not limited to the engaging recess 13a, but may be an engaging hole 13d as shown in FIG.

Furthermore, in the first and second embodiments, the case where the present invention is applied to an electric tilt steering apparatus for a vehicle as an electric position adjustment type steering apparatus for a vehicle has been described, but the present invention is not limited to this. Instead, as shown in FIG. 20, the present invention can also be applied to an electric telescopic steering device for a vehicle.
That is, the cylindrical steering column 1 is connected to the fixed column portion 1A so that the sliding column portion 1B is slidable in the axial direction, and protrudes from the fixed column portion 1A to cover the sliding column portion 1B. In this electric box 51, a support portion 52 having the same configuration as the support portion 12 described above is formed to project on the sliding column portion 1B. Then, adjustment nuts 53A and 53B are disposed through sliding members 54A and 54B at open positions at both ends of an insertion hole 52a drilled in parallel with the axial direction of the sliding column portion 1B of the support portion 52, and these adjusting nuts. A screw shaft 55 that extends in parallel with the axial direction of the sliding column portion 1B and is rotatably supported in the electric box 51 is screwed into 53A and 53B, and the screw shaft 55 is connected via a worm wheel 58 and a worm 60. Thus, the electric motor 59 is connected.

With this configuration, when the electric motor 59 is driven forward / reversely, the adjustment nuts 53A and 53B are moved in the axial direction of the screw shaft 55 via the screw shaft 55. Move in the axial direction. For this reason, the sliding column portion 1B expands and contracts with respect to the fixed column portion 1A, the length of the entire steering column 1 can be adjusted, and the front and rear positions of the steering wheel connected thereto can be adjusted. it can.
Also in this case, as in the above-described embodiment, by applying at least one of the adjustment nuts 53A and 53B and applying a preload, a gap is formed between the female screw of the adjustment nut 53A and 53B and the male screw of the screw shaft 55. It is possible to prevent the occurrence of backlash in the axial direction of the screw shaft 55 with certainty.

It is a side view which shows the state which mounted | wore the actual vehicle with the electric position adjustment type steering apparatus which concerns on embodiment of this invention. FIG. 2 is a side view of the electric position adjustment type steering apparatus shown in FIG. 1. It is a top view of the electric position adjustment type steering apparatus shown in FIG. It is an expanded sectional view along the AA line of FIG. It is an expanded sectional view along the BB line of FIG. FIG. 5 is an enlarged cross-sectional view along the line DD in FIG. 4. FIG. 3 is an enlarged end view taken along line CC in FIG. 2. FIG. 3 is a side view of the electric position adjustment type steering apparatus shown in FIG. It is sectional drawing along the EE line of FIG. 8, Comprising: The time of a tilt raise is shown. It is sectional drawing similar to FIG. 4 which shows the modification of an adjustment nut. It is sectional drawing similar to FIG. 4 which shows the 2nd Embodiment of this invention. It is sectional drawing similar to FIG. 6 which shows the further another example of an adjustment nut. It is sectional drawing of a support part. It is sectional drawing similar to FIG. 11 which shows the modification of 2nd Embodiment. It is a perspective view of the principal part which shows the modification of a steering column. It is a longitudinal cross-sectional view of FIG. It is the FF sectional view taken on the line of FIG. It is a front view of a support part. It is sectional drawing similar to FIG. 17 which shows the modification of an adjustment nut. It is sectional drawing which made a part the cross section which shows other embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Steering column, 2 ... Steering shaft, 3 ... Cross shaft, 4 ... Intermediate shaft, 5 ... Lower bracket, 6 ... Tilt center pin, 7 ... Upper bracket, 8 ... Electric box, 9 ... Bolt, 10 ... Tilt mechanism part , 11 ... slide part, 12 ... support part, 12a ... insertion hole, 12b, 12c ... step part, 12j, 12ja to 12jc ... pin fitting recess, 13A, 13B ... adjustment nut, 13a ... engagement recess, 13b ... Positioning pin, 13d ... engaging hole, 14A, 14B ... sliding member, 15 ... screw shaft, 16, 17 ... bearing, 18 ... worm wheel, 19 ... electric motor, 20 ... worm, 51 ... electric box, 52 ... support Part, 53A. 53B ... Adjustment nut, 54A, 54b ... Sliding member, 55 ... Screw shaft, 58 ... Worm wheel, 59 ... Electric motor, 60 ... Worm

Claims (10)

In the vehicle electric position adjustment type steering device for adjusting the position of the steering column by the electric motor,
A support portion having an insertion hole protruding from the steering column; a nut portion which is rotationally restrained at an end portion of the insertion hole of the support portion and provided with a preload; a female screw hole of the support portion; An electric position adjusting type steering apparatus for a vehicle, comprising: a screw shaft that is screwed into a nut portion and is rotationally driven by the electric motor.   2. The electric position adjustment type steering apparatus for a vehicle according to claim 1, wherein a female screw that is screwed into the screw shaft is formed on an inner peripheral surface of the insertion hole of the support portion. In the vehicle electric position adjustment type steering device for adjusting the position of the steering column by the electric motor,
A support portion having an insertion hole projecting from the steering column; a pair of nut portions disposed to be rotationally restrained at both ends of the insertion hole of the support portion; and the pair of nut portions passing through the insertion hole An electric position adjusting type steering device for a vehicle, comprising: a screw shaft that is screwed onto the screw shaft and is rotationally driven by the electric motor.   The electric position adjusting type steering apparatus for a vehicle according to any one of claims 1 to 3, wherein a sliding member is inserted between the support portion and the nut portion.   The nut portion is accommodated in a nut accommodating portion formed in the support portion, and a pin fitting portion for fitting a positioning pin is formed in one of the nut accommodating portion and the nut portion, and the pin is fitted in the other A side wall is formed to face the portion, and the nut is rotationally restrained by press-fitting the positioning pin between the pin fitting portion and the side wall. 5. The electric position adjustment type steering device for a vehicle according to any one of 4.   Forming a pin insertion portion for inserting a positioning pin in either one of the nut portion and the support surface end portion, forming a pin locking portion for locking the positioning pin inserted in the pin insertion portion on the other, 6. The structure according to claim 1, wherein the nut portion is configured to be rotationally restrained by inserting the positioning pin through the pin insertion portion and engaging with the pin engagement portion. The electric position adjustment type steering device for a vehicle according to the item.   The pin insertion portion is formed by an axially extending engaging recess formed on the outer peripheral surface of the nut portion, and the pin locking portion is a pin fitting groove for fitting a pin formed on the end surface of the support portion The electric position adjusting type steering device for a vehicle according to claim 6, characterized in that it is formed by:   One of the pin insertion portion and the pin locking portion is formed at equal intervals in the circumferential direction, and the other is formed at a plurality of unequal intervals different from the equal intervals in the circumferential direction. The electric position adjustment type steering device for a vehicle according to claim 6 or 7.   The said support part is extended in the direction which cross | intersects the axial direction of the said steering column, It is comprised so that the said steering column may be tilted by rotation of the said screw shaft. The electric position adjustment type steering device for a vehicle according to the item.   The said support part is extended in the direction in alignment with the axial direction of the said steering column, It is comprised so that the said steering column may be expanded-contracted by rotation of the said screw shaft. The electric position-adjustable steering device for a vehicle according to 1.

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