JP2007090977A - Electric tilt type telescopic steering column - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a single motor and a single screw shaft for making them perform tilting and telescopic operations. <P>SOLUTION: To the screw shaft 26 supported by a housing 5, a tilt nut 32 is screw-coupled by a friction resistance regulating means 104. A move and stop member 100 is provided to enclose the tilt nut 32 to be relatively movable. A motor 29 provided at the move and stop member 100 is interlock-connected to the tilt nut 32. A telescopic nut 42 screw-coupled to the other end of the screw shaft 26 is then coupled to a jacket tube 11. When the screw shaft 26 is locked, the move and stop member 100 moves for the tilting operation. When it is unlocked, friction resistance with the tilt nut 32 makes the screw shaft 26 rotate for the telescopic operation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric tilt telescopic steering column in which two operations, tilt and telescopic, are performed by a single motor and a single screw shaft.

  Some automobiles are provided with an electric tilt telescopic steering column that operates a tilt mechanism and a telescopic mechanism by an electric motor. As a tilt mechanism in the electric tilt telescopic steering column, a tilt hinge is provided on the proximal side near the steering wheel, and a part of the steering shaft and a support part covering the part of the steering shaft are configured to be refracted by the tilt hinge part. In some cases, a tilt hinge is provided at the foot and the entire steering shaft is refracted at the tilt hinge.

An example of a conventional electric tilt telescopic steering column is disclosed in Patent Document 1. This is such that the foot side telescopes and the hand side tilts. Then, the screw shaft of the tilt mechanism and the screw shaft of the telescopic mechanism are arranged in parallel below the steering shaft, and the rotational motion input from a single motor is selectively transmitted to one of the screw shafts via the transmission mechanism. It is made to be done.
JP-A-4-231263

  However, since the two screw shafts are arranged, not only the space for laying out the screw shafts is increased, but also the mechanism for switching the screw shafts to be output becomes complicated and the manufacturing cost increases.

  Accordingly, an object of the present invention is to provide an electric tilt telescopic steering column that solves the above-described problems by using not only a motor but also a single screw shaft.

  According to the first aspect of the present invention, a lower shaft connected to the steering wheel and an upper shaft connected to the steering wheel are connected to each other so as to be relatively movable to form a telescopic steering shaft, and the lower shaft is rotated. A first support member that freely supports; and a second support member that rotatably supports the upper shaft and that is movable in the axial direction of the steering shaft with respect to the first support member. A screw shaft substantially parallel to the axis of the steering shaft is rotatably supported on one of the member and the second support member, and a tilt nut is screwed to the base end side of the screw shaft. A moving / stopping member is provided that surrounds it rotatably, a motor is provided on the moving / stopping member, and an output shaft of the motor is connected to the tilt nut. A telescopic nut is coupled to the other of the first support member or the second support member, and the tip end side of the screw shaft is thread-coupled to the telescopic nut, and the screw and the tilt nut are coupled to each other. Friction resistance adjusting means for increasing or decreasing the friction resistance of the part is provided, and lock means for locking or unlocking the rotation of the screw shaft is provided.

  According to the present invention, when the screw shaft is locked, the moving / stopping member moves along the screw shaft by sliding of the screw coupling portion, and the steering wheel is tilted. On the other hand, when the screw shaft is unlocked, slippage does not occur at the screw coupling portion, so that the screw shaft rotates integrally with the tilt nut and the telescopic nut moves, while the moving / stopping member stops and the steering wheel stops. Telescoes.

  Since the steering wheel can be tilted and telescopically provided not only with the motor but also with a single screw shaft, the space for layout of the screw shaft can be reduced. In addition, switching between tilt and telescopic is only necessary by providing a lock means and a frictional resistance adjusting means for locking or unlocking the screw shaft, and the mechanism is simple and the manufacturing cost is low.

  According to a second aspect of the present invention, in the electric tilt telescopic steering column according to the first aspect, the screw shaft is provided on the first support member, and a first apex portion of a swing arm having a substantially triangular shape is provided on the first tilting member. The swing member is supported by the support member in a swingable manner, the second vertex portion of the swing arm is supported swingably on the vehicle body side via the inter-axis distance variation absorbing means, and the third vertex portion of the swing arm is The moving / stop member is supported so as to be swingable through an inter-shaft distance fluctuation absorbing means, and the swinging arm swings about the first apex portion by moving the moving / stop member along the screw shaft. And the first support member tilts.

  According to this invention, when the moving / stopping member moves relative to the first support member during tilting, the moving / stopping member moves the third vertex of the swing arm through the inter-axis distance variation absorbing means. Since it is swung in the axial direction, the second apex of the swing arm supported on the vehicle body is swung in the vertical direction via the inter-axis distance fluctuation absorbing means, and as a result, the first support member provided with the screw shaft is The steering wheel is tilted up and down, and the steering wheel is tilted. Since the inter-axis distance fluctuation absorbing means absorbs the fluctuation of the inter-axis distance, the swing arm is smoothly swung.

  According to a third aspect of the present invention, in the electric tilt telescopic steering column according to the first aspect, an extension shaft is oscillated through a universal joint at the tip of the upper shaft, and the extension shaft is rotatable. A third support member to be supported is connected to the second support member so as to be swingable up and down around the center of swing of the extension shaft, and the screw shaft is provided on the second support member. The third support member is tilted with respect to the support member, and the telescopic nut is provided on the first support member, and the first support member telescopes with respect to the second support member.

  According to the present invention, when the moving / stopping member moves relative to the second support member during tilting, the third support member swings up and down with respect to the second support member provided with the screw shaft. As a result, the steering wheel connected to the end of the extension shaft tilts. On the other hand, when performing telescopic movement, if the telescopic nut moves along the screw shaft, the first support member moves in the axial direction with respect to the second support member, in other words, the second support with respect to the first support member. The member moves in the axial direction, whereby the steering wheel telescopes together with the extension shaft provided at the tip of the upper shaft.

  According to the electric tilt telescopic steering column according to the present invention, since not only the motor but also the screw shaft is single, the occupied space of the screw shaft is reduced, and the occupied space of the electric tilt telescopic steering column is reduced. In addition, switching between tilt and telescopic is only necessary by providing a lock means and a frictional resistance adjusting means for locking or unlocking the screw shaft, and the mechanism is simple and the manufacturing cost is low.

  Further, since the swing arm, the moving / stopping member, and the swing arm and the vehicle body side are connected via the inter-shaft distance fluctuation absorbing means, the structure can be fixed without adopting a configuration for swinging the screw shaft. The swing arm can be swung, so that the two screw shafts for tilt and telescopic which are originally required can be arranged on the same axis, and further, the screw shaft and the tilt nut By combining the moving / stopping member, etc., the same effect as that obtained by providing two screw shafts with a single screw shaft can be obtained.

Embodiments of an electric tilt telescopic steering column according to the present invention will be described below. Embodiment 1 shows a case where a tilt hinge is provided at the foot and the entire steering shaft is tilted, and Embodiment 2 shows a case where the tilt hinge is provided on the hand side and only the upper portion of the steering shaft is tilted. is there.
(A) Embodiment 1
First, the first embodiment will be described. A front view of the electric tilt telescopic steering column is shown in FIG. 4, and a bottom view is shown in FIG.

  As shown in FIG. 4, a lower shaft 1 connected to a steering wheel (not shown) and an upper shaft 2 connected to a steering wheel (not shown) are connected to each other through a spline coupling (not shown) so as to be movable. A free steering shaft 15 is configured. A universal joint 105 is provided at the left end of the lower shaft 1 so that it can be bent.

  The lower shaft 1 is provided with a housing 5 as a first support member that rotatably supports the lower shaft 1. The housing 5 includes a cylindrical portion 6 that covers the right side of the lower shaft 1 and a cylindrical portion 7 that covers the left side of the lower shaft 1. A tilt hinge hole 7a for swingably coupling the housing 5 to the vehicle body via a bolt (not shown) is formed on the left side of the cylindrical portion 7. This bolt serves as a tilt hinge of the housing 5.

  The upper shaft 2 is provided with a cylindrical jacket tube 11 as a second support member that rotatably supports the upper shaft 2 via a bearing (not shown). The end portion of the jacket tube 11 is inserted inside the cylindrical portion 6 constituting the housing 5, and the jacket tube 11 does not rotate relative to the housing 5 in the circumferential direction, so that the steering shaft 15 It is configured to be movable in the axial direction.

  Next, a configuration for swinging the housing 5 around the tilt hinge hole 7a to tilt a steering wheel (not shown) will be described. A substantially triangular swing arm 19 is disposed on each side of the cylindrical portion 6 constituting the housing 5. As shown in FIG. 4, a first apex portion 19 a which is a base end portion of the swing arm 19 is swingably coupled to the side surface of the cylindrical portion 6 via a bolt 20. The second apex portion 19b, which is one tip of the swing arm 19, is in a position that swings in the vertical direction with respect to the first apex portion 19a, and the second apex portion 19b is a vertical position of the bracket 21 attached to the vehicle body. It arrange | positions inside the part 21a and the 2nd vertex part 19b is couple | bonded with the vertical part 21a so that rocking | fluctuation is possible.

  A connection structure between the vertical portion 21a and the second apex portion 19b of the swing arm 19 will be described below. When the housing 5 swings about the tilt hinge hole 7a, the portion of the bolt 20 screwed into the housing 5 swings about the tilt hinge hole 7a, and the vertical portion 21a on the bracket 21 and the swing arm. The center portion of the vertical portion 21a swings around the connecting portion with the bolt 19. If the connecting portion is simply bolted, the distance between the shafts of the connecting portion of the vertical portion 21a and the bolt 20 varies during the swinging. The swing arm 19 cannot swing. For this reason, in order to absorb the increase and decrease of the distance between the shafts during the swinging and ensure the connection and the swinging, the eccentric bush 24 as the shaft distance fluctuation absorbing means is freely rotatable around the center of the vertical portion 21a. The eccentric position of the eccentric bush 24 and the second apex portion 19b of the swing arm 19 are coupled to each other via a bolt 25 so as to be swingable.

  The swing arm 19 provided on the housing 5 is swung around the bolt 20 to move the housing 5 up and down, and as a result, the swing arm is swung around the tilt hinge hole 7a. The third apex portion 19c, which is the other tip end portion 19, is positioned so as to swing in the left-right direction with respect to the first apex portion 19a, and the position of the third apex portion 19c is set in the left-right direction in FIG. A mechanism for swinging is provided.

  A screw shaft 26 is rotatably supported at a lower portion of the cylindrical portion 6 in the housing 5 so as to be substantially parallel to the axis of the steering shaft 15. As shown in FIG. 1, the screw shaft 26 is rotatably supported by shaft support portions 6 a and 6 b protruding downward from the cylindrical portion 6 via bearings 27 and 28. A male screw 26 a is formed on the outer peripheral surface of the screw shaft 26, and a tilt nut 32 is screwed to the base end side of the screw shaft 26. The tilt nut 32 is provided with a moving / stopping member 100 surrounding the tilt nut 32. A pair of bearings 31 is provided between the moving / stopping member 100 and the tilt nut 32, and the moving / stopping member 100 is rotatable relative to the tilt nut 32. A motor 29 is attached to the lower part of the moving / stopping member 100 so as to protrude leftward with respect to the vehicle body, and an output shaft 29 a of the motor 29 is interlocked and connected to the tilt nut 32. That is, as shown in FIG. 2, the worm wheel portion 32a is formed on the outer peripheral surface of the intermediate portion in the length direction of the tilt nut 32, and the worm wheel portion 32a has a worm wheel provided on the output shaft 29a of the motor 29. 47 is engaged.

  A configuration for moving the third apex portion 19c of the swing arm 19 in the left-right direction by moving the moving / stopping member 100 along the screw shaft 26 and thereby swinging the housing 5 will be described. While the moving / stopping member 100 moves linearly in the left-right direction, the third apex portion 19c of the swing arm 19 moves while drawing an arc centered on the bolt 20, so the two are simply bolted together. Then, since the distance between both axes differs, it does not move smoothly. For this reason, the moving / stopping member 100 and the third apex portion 19c of the swing arm 19 are connected via a link 33 as an inter-axis distance variation absorbing means. That is, as shown in FIG. 1, one end of the link 33 is swingably coupled to the left and right side surfaces of the moving / stopping member 100 via the bolt 34, and the other end of the link 33 is the third of the swing arm 19. The top 19c is pivotably coupled via a bolt 35.

  On the other hand, a telescopic nut 42 is coupled to the jacket tube 11 serving as the second support member via a mounting portion 11a that protrudes downward, and the open end portion side of the screw shaft 26 is screwed to the telescopic nut 42. Yes.

  If the screw shaft 26 is locked when the motor 29 rotates, the screw coupling portion between the tilt nut 32 and the screw shaft 26 slips, and the tilt nut 32 rotates with respect to the locked screw shaft 26. Tilt is performed by moving the moving / stopping member 100 together with the tilt nut 32. On the other hand, if the screw shaft 26 is unlocked, the screw coupling portion does not slip, so that the screw shaft 26 Is rotated integrally with the tilt nut 32, while the moving / stopping member 100 is stopped, and the jacket tube 11 is moved together with the tilt nut 32 which is moved by the rotation of the screw shaft 26, and telescopic recording is performed. Therefore, the locking means 106 for locking or unlocking the screw shaft 26 and the friction resistance between the tilt nut 32 and the screw shaft 26 are adjusted so that the tilt and telescopic can be selectively performed, and the slip condition between the two is adjusted. Friction resistance adjusting means 104 for adjusting the above is provided.

  The locking means 106 locks or unlocks the screw shaft 26. That is, as shown in FIGS. 1 and 2, a lock gear 36 having convex portions 36 a at equal intervals in the circumferential direction is coupled to the screw shaft 26 in the vicinity of the bearing 28, while the cylinder of the housing 5. The part 6 is provided with a solenoid 37. When the rod 37a of the solenoid 37 protrudes, the rod 37a engages with the lock gear 36 and the screw shaft 26 is locked, and when the rod 37a is retracted, the lock is released.

  When the screw shaft 26 is unlocked, the frictional resistance adjusting means 104 performs telescopic operation by rotating the screw shaft 26 integrally with the tilt nut 32 without causing slippage at the screw coupling portion. In this case, the screw coupling portion slips and the tilt nut 32 rotates and moves with respect to the screw shaft 26, and the moving / stop member 100 moves linearly with the tilt nut 32 so that the tilt is performed. This increases or decreases the frictional resistance of the joint. The frictional resistance adjusting means 104 is configured as follows. That is, as shown in FIG. 3, a through-hole 38 that penetrates the tilt nut 32 in the radial direction is formed, and a pressed member 39 is inserted into the through-hole 38 to bias the pressed member 39. The adjustment screw 41 is screwed in via a spring 40 as

  4 and 5 indicate a power steering device that applies a steering assist force to the steering shaft 15.

  Next, the operation of the electric tilt telescopic steering column will be described.

  In order to tilt the steering wheel, the solenoid 37 is excited to cause the rod 37a to protrude and engage with the lock gear 36, and the output shaft 29a of the motor 29 is rotated in either direction while the screw shaft 26 is locked. Let Then, the rotational motion of the output shaft 29a is transmitted to the tilt nut 32 via the worm 47 and the worm wheel portion 32a. When the rotational force of the tilt nut 32 at this time becomes larger than the frictional resistance between the pressed member 39 and the external screw 26a, the screw coupling portion slips, and the tilt nut 32 rotates with respect to the locked screw shaft 26. The tilt nut 32 moves in the axial direction. A movement / stop member 100 is rotatably attached to the tilt nut 32 via a bearing 31, and the movement / stop member 100 is guided in the axial direction in a state in which the rotation is restricted by the link 33 and the swing arm 19. Therefore, the moving / stopping member 100 moves along the screw shaft 26.

  In FIG. 4, when the moving / stopping member 100 moves in the left-right direction, the movement of the moving / stopping member 100 is transmitted to the swing arm 19 via the link 33, and the third vertex 19 c of the swing arm 19 receives the bolt 20. It swings in either direction as the center. Then, the portion of the second apex portion 19b of the swing arm 19 moves up or down. This means that the position of the bolt 20 of the swing arm 19 moves up and down with respect to the bracket 21 fixed to the vehicle body, and the housing 5 coupled to the swing arm 19 via the bolt 20 is connected to the tilt hinge hole. It swings up and down around 7a. As a result, the entire steering shaft 15 is tilted up and down, and a steering wheel (not shown) is tilted.

  When the swing arm 19 swings around the bolt 20, the bolt 35 moves in a circular arc around the bolt 20, but the moving / stop member 100 moves linearly along the screw shaft 26. The trajectories of 35 and the moving / stopping member 100 do not coincide with each other, and the distance between these axes varies. Here, since the bolt 35 and the moving / stopping member 100 are connected via the link 33, the force can be transmitted from the moving / stopping member 100 to the bolt 35 while absorbing the fluctuation of the inter-axis distance, and the swing arm The swing of 19 is performed smoothly.

  Further, since the bolt 20 makes an arc motion around the second apex portion 19b of the swing arm 19, and the bolt 20 makes an arc motion around the tilt hinge hole 7a, the bracket 21 and the second apex portion of the swing arm 19 are moved. If the connecting portion to 19b is simply bolted, the trajectory of the bolt 20 will not match and the swinging arm 19 will be difficult to swing. Here, since the second apex portion 19b and the bracket 21 are coupled via the eccentric bush 24, the coupling and oscillation of the second apex portion 19b of the swing arm 19 and the bracket 21 are absorbed while absorbing fluctuations in the inter-axis distance. The swinging arm 19 can be smoothly swung.

  Next, to telescope the steering wheel, the energization of the solenoid 37 is stopped, the rod 37a is retracted, and the output shaft 29a of the motor 29 is rotated in either direction with the screw shaft 26 unlocked. Then, the rotational motion of the output shaft 29a is transmitted to the tilt nut 32 via the worm 47 and the worm wheel portion 32a. Since the screw shaft 26 is unlocked and rotatable, the rotational motion of the tilt nut 32 is transmitted to the screw shaft 26 as it is due to the frictional resistance between the pressed member 39 of the frictional resistance adjusting means 104 and the external thread 26a. Thereby, the movement / stop member 100 maintains the stop state without moving. When the screw shaft 26 rotates, the screw shaft 26 is screwed into the telescopic nut 42, so that the jacket tube 11 integrated with the telescopic nut 42 moves relative to the housing 5 in the axial direction. As a result, the upper shaft 2 moves in the axial direction, and the steering wheel telescopes.

According to the present invention, since not only the motor but also the screw shaft is used for tilting and telescopic of the steering wheel, the space for laying out the screw shaft 26 can be reduced. In order to switch between tilt and telescopic, it is only necessary to provide the locking means 106 and the frictional resistance adjusting means 104 for locking or unlocking the screw shaft 26, and the mechanism is simple and the manufacturing cost is low.
(B) Embodiment 2
Next, a second embodiment will be described. In this embodiment, the tilt hinge is positioned on the hand side, and since the basic configuration is shown in the first embodiment, the same reference numerals are used for components having the same functions as those in the first embodiment. This will be briefly described with reference to FIG.

  In this case, in addition to the lower shaft 1 and the upper shaft 2, an extension shaft 101 is interposed at the tip of the upper shaft 2 via a universal joint 103, and the third support member supports the extension shaft 101. The extension tube 102 is connected to the jacket tube 11 so as to be swingable in the vertical direction around the swing center of the universal joint 103 through bending means (not shown).

  The housing 5 that supports the lower shaft 1 is fixed to the bracket 21 fixed to the vehicle body so as not to swing. As in the first embodiment, the jacket tube 11 is movable along the axial direction with respect to the housing 5, and the upper shaft 2 is also movable along the axial direction with respect to the lower shaft 1.

  In this embodiment, the screw shaft 26 is provided on the jacket tube 11. The screw shaft 26 is supported by a pair of shaft support portions 11a and 11b integral with the jacket tube 11, and a tilt nut 32 is screwed to the base end side of the screw shaft 26 via a friction resistance adjusting means (not shown). Has been. The moving / stopping member 100 provided so as to surround the tilt nut 32 is rotatable relative to the tilt nut 32. The moving / stopping member 100 is provided with a motor 29, and an output shaft 29a of the motor 29 is linked to a tilt nut 32 via a worm and a worm wheel (not shown).

  The moving / stopping member 100 is guided in the axial direction in a state where the rotation is restrained by the link 33 and the swing arm 19. Further, in order to lock or unlock the screw shaft 26, a locking means 106 including a lock gear 36 and a solenoid (not shown) is provided.

  On the other hand, a first apex portion 19a, which is a base end portion of a substantially triangular swing arm 19, is coupled to the jacket tube 11 via a bolt 20 so as to be swingable. The second apex portion 19b is connected to the extension tube 102 via an eccentric bush 24 serving as an inter-axis distance fluctuation absorbing means and a bolt 25, and the third apex portion 19c which is the other end portion of the swing arm 19 is a bolt 35. Are connected to the moving / stopping member 100 through a link 33 and a bolt 34 as an inter-axis distance fluctuation absorbing means.

  The portion of the eccentric bush 24 on the swing arm 19 is an arcuate track centered on the bolt 20, and the portion of the eccentric bush 24 on the extension tube 102 is the upper shaft 2 and the extension shaft 101. This is to absorb the arc trajectory centered on the universal joint 103 (tilt hinge), which is the center of oscillation, and the trajectory is different. Since the reason for using the link 33 is the same as that of the first embodiment, the description thereof is omitted. When the position of the bolt 20 that joins the first apex portion 19a of the swing arm 19 is arranged coaxially with the universal joint 103 that is a tilt hinge, the eccentric bush 24 is not necessary, and the second of the swing arm 19 is eliminated. The apex portion 19b may be directly coupled to the extension tube 102 only through the bolt 25.

  On the other hand, the housing 5 is provided with a telescopic nut 42 through a shaft support portion 5a, and the distal end side of the screw shaft 26 is screwed into the telescopic nut 42.

  For tilting, the tilt nut 32 is rotated by the motor 29 while the screw shaft 26 is locked by the locking means 106. Then, slip occurs between the tilt nut 32 and the screw shaft 26, whereby the tilt nut 32 rotates and moves with respect to the screw shaft 26, and the moving / stopping member 100 along with the tilt nut 32 moves along the screw shaft 26. Move. For this reason, the swing arm 19 in which the third apex portion 19c is connected to the moving / stop member 100 via the link 33 swings around the bolt 20, so that the extension tube 102 moves up and down with respect to the jacket tube 11. And the extension shaft 101 swings up and down, and the steering wheel tilts.

  In order to telescopically, the tilt nut 32 is rotated by the motor 29 while the screw shaft 26 is unlocked by the lock means 106. The screw shaft 26 rotates integrally with the tilt nut 32 by the action of the frictional resistance adjusting means (not shown), and the rotating screw shaft 26 is screwed into the telescopic nut 42. For this reason, the housing 5 moves in the axial direction with respect to the jacket tube 11, in other words, the jacket tube 11 moves in the axial direction with respect to the housing 5, so that the upper shaft 2 together with the jacket tube 11 moves along the axial line. Move in the direction and the steering wheel telescopes.

  In the first and second embodiments, the motor is arranged on the left side of the vehicle body, but may be arranged on the right side according to the layout of the vehicle type and other components. Or it can arrange | position toward the upper left, without making it protrude only to the left side, and can also reduce the protrusion amount of a motor.

  Although the eccentric bushing is used on the one hand and the link is used on the other hand as the inter-axis distance fluctuation absorbing means, any of them may be used. Generally, when the distance between the coupling parts is short, the eccentric bushing is If so, use a link.

The top view of the principal part of an electric tilt telescopic steering column (Embodiment 1). The perspective view of the principal part of an electric tilt telescopic steering column (Embodiment 1). The block diagram of the vicinity of a tilt nut (Embodiment 1). The front view of an electric tilt telescopic steering column (Embodiment 1). The bottom view of an electric tilt telescopic steering column (Embodiment 1). Front sectional view of an electric tilt telescopic steering column (Embodiment 2).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lower shaft 2 ... Upper shaft 5 ... Housing (1st support member)
11 ... Jacket tube (second support member)
DESCRIPTION OF SYMBOLS 15 ... Steering shaft 19 ... Swing arm 19a ... 1st vertex part 19b ... 2nd vertex part 19c ... 3rd vertex part 21 ... Bracket 24 ... Eccentric bush (interaxial distance fluctuation | variation absorption means)
26 ... Screw shaft 29 ... Motor 32 ... Tilt nut 33 ... Link (Inter-axis distance fluctuation absorbing means)
42 ... Telescopic nut 100 ... Moving / stop member 101 ... Extension shaft 102 ... Extension tube (third support member)
104: Friction resistance adjusting means 106 ... Locking means

Claims (3)

The lower shaft connected to the steering wheel and the upper shaft connected to the steering wheel are relatively movably connected to form a telescopic steering shaft.
A first support member that rotatably supports the lower shaft, and a second support member that rotatably supports the upper shaft and that is movable in the axial direction of the steering shaft with respect to the first support member are provided. ,
A screw shaft substantially parallel to the axis of the steering shaft is rotatably supported on one of the first support member or the second support member, and a tilt nut is screwed to the base end side of the screw shaft, A moving / stopping member that surrounds the tilt nut so as to be relatively rotatable is provided, a motor is provided on the moving / stopping member, and an output shaft of the motor is interlocked to the tilt nut to connect the first support member or the second support member. A telescopic nut is coupled to the other of the members, and the distal end side of the screw shaft is coupled to the telescopic nut by screwing;
An electric tilt telescopic steering column, characterized in that a friction resistance adjusting means for increasing or decreasing a friction resistance of a screw coupling portion between the screw and the tilt nut is provided, and a lock means for locking or unlocking the rotation of the screw shaft is provided. . In the electric tilt telescopic steering column according to claim 1,
The screw shaft is provided on the first support member, the first vertex of the swing arm having a substantially triangular shape is swingably supported by the first support member, and the second vertex of the swing arm is supported by the vehicle body. The third apex portion of the swing arm is swingably supported by the moving / stop member via the inter-axis distance variation absorbing means.
The electric tilt telescopic steering column, wherein the moving / stopping member moves along the screw shaft so that the swinging arm swings around a first vertex and the first support member tilts. . In the electric tilt telescopic steering column according to claim 1,
An extension shaft is oscillated through a universal joint at the tip of the upper shaft, and a third support member for rotatably supporting the extension shaft is oscillated with respect to the second support member. It is connected so that it can swing up and down around the center of
The screw shaft is provided in the second support member, and the third support member is tilted with respect to the second support member, while the telescopic nut is provided in the first support member, and the first support member is provided in the first support member. 2. An electric tilt telescopic steering column characterized by telescopic with respect to a support member.

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