JP6447871B2 - Steering device - Google Patents

Description

  The present invention relates to a steering device.

  A steering column described in Patent Literature 1 includes an outer jacket and an inner jacket that is slidably disposed in the outer jacket. The first portion of the energy absorbing strap is attached to the inner jacket. The tooth portion of the second portion of the energy absorbing strap meshes with the tooth portion of the rocking cam supported by the outer jacket. The energy absorbing strap has a U-shaped portion disposed around a cylindrical mandrel attached to the end portion of the inner jacket between the first portion and the second portion. In the event of a vehicle collision, the energy absorbing strap is pulled between the inner jacket and the outer jacket. At that time, energy is absorbed by the first part being handled along the mandrel.

US Patent Application Publication No. 2010/0300238

  In the steering device using the impact absorbing mechanism including the energy absorbing strap and the mandrel described in Patent Document 1, the mandrel attached to the inner jacket absorbs the impact at the time of the secondary collision at the time of the secondary collision of the vehicle collision. Move with the inner jacket. For this reason, it is necessary to provide a space for accommodating the mandrel after the secondary collision in addition to the energy absorbing strap in advance on the outside of the column jacket, which may reduce the degree of freedom in design.

  The present invention has been made under such a background, and an object thereof is to provide a steering device capable of improving the degree of freedom in design in a configuration including an impact absorbing mechanism.

  The invention according to claim 1 includes a steering shaft (3) that can be expanded and contracted in the axial direction (X), a slit (26), and a pair of tightening portions (19) disposed on both sides of the slit. A column jacket (6) that includes a lower jacket (8) and an upper jacket (7) that is fitted to the lower jacket, and that is rotatably extendable in the axial direction and rotatably supports the steering shaft; A tightening mechanism (18) including a tightening shaft (21) for tightening the tightened portion and an operation lever (20) for rotating the tightening shaft to achieve telescopic locking by friction between the jackets; An impact absorbing mechanism (40) for absorbing an impact at the time of the next collision, and the impact absorbing mechanism is supported in the axial direction so as to be integrally movable in the axial direction by the upper jacket. Between the first friction plate (41) and the second friction plate (42) supported by the lower jacket so as not to move in the axial direction and facing the first friction plate, and the pair of tightened portions. An outer surface of the upper jacket is supported by the tightening shaft so as to be integrally rotatable, and in a telescopic lock state, the overlapping region (L) of the first friction plate and the second friction plate is interposed between the pair of tightened portions. (7a) a pressing member (43) that presses toward the side, and is configured to generate an impact absorbing load by sliding friction between the first friction plate and the second friction plate at the time of a secondary collision. A steering device (1).

A second aspect of the present invention is the steering apparatus according to the first aspect, wherein the first friction plate and the second friction plate are floatingly supported before and after the pressing direction (A) of the pressing member.
The invention according to claim 3 is the fixed shaft (50) according to claim 2, wherein the shock absorbing mechanism is fixed to the upper jacket through the insertion hole (41a) provided in the first friction plate. And an elastic member (51) for scraping interposed between the outer periphery of the fixed shaft and the inner periphery of the insertion hole.

According to a fourth aspect of the present invention, in the second or third aspect, each of the inner side surfaces (19b) of the pair of tightened portions has a corresponding end portion (42a) of the second friction plate in the pressing direction. It is a steering device including the ditch | groove (52) which guides back and forth.
A fifth aspect of the present invention is the steering apparatus according to the fourth aspect, wherein each end of the second friction plate is provided with a flange (53) along a corresponding concave groove.

  In addition, in the above, the numbers in parentheses represent reference numerals of corresponding components in the embodiments described later, but the scope of the claims is not limited by these reference numerals.

  According to the first aspect of the present invention, at the time of the secondary collision, the first friction plate parallel to the axial direction of the steering shaft moves integrally with the upper jacket and slides with the second friction plate to generate an impact absorbing load. To do. Therefore, the space required outside the column jacket to accommodate the shock absorbing mechanism after the secondary collision is sufficient to accommodate the first friction plate. Therefore, since the space for accommodating the shock absorbing mechanism after the secondary collision can be reduced, the degree of freedom in design can be improved.

  According to the second aspect of the present invention, the first friction plate and the second friction plate are supported in a floating manner before and after the pressing direction of the pressing member. Therefore, in a state where the overlapping region between the first friction plate and the second friction plate is not pressed by the pressing member, that is, in a state where the telescopic lock is released, the sliding friction between the first friction plate and the second friction plate is reduced. Is done. Therefore, telescopic adjustment can be performed smoothly.

According to the third aspect of the present invention, the backlash between the first friction plate and the fixed shaft can be removed by the elastic member for backlashing.
According to the invention of claim 4, since the second friction plate is guided in the pressing direction by the concave groove, it is possible to suppress the occurrence of displacement of the second friction plate with respect to the lower jacket.
According to the fifth aspect of the present invention, each end portion of the second friction plate is provided with a flange along the corresponding concave groove, so that the occurrence of displacement of the second friction plate with respect to the lower jacket is further suppressed. can do.

1 is a schematic side view of a steering device according to an embodiment of the present invention. It is a schematic perspective view of a steering device. It is sectional drawing along the III-III line of FIG. It is a disassembled perspective view around an impact absorbing mechanism. It is sectional drawing along the VV line of FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a perspective view of the periphery of the edge part of a 2nd friction board. FIG. 6 is a view showing a state after the tightening shaft is rotated from the state of FIG. 5, and is a view showing a state in which the pressing member is released from the first friction plate and the second friction plate. It is the figure which showed the shock absorption mechanism periphery after a secondary collision.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic side view of a steering apparatus 1 according to an embodiment of the present invention.
Referring to FIG. 1, a steering device 1 is connected to a steering shaft 3 having a steering member 2 such as a steering wheel connected to one end (the upper end in the axial direction), an intermediate shaft 4, and the like. And a steering mechanism 5.

  The steered mechanism 5 is, for example, a rack and pinion mechanism that steers steered wheels (not shown) in conjunction with the steering of the steering member 2. The rotation of the steering member 2 is transmitted to the steering mechanism 5 via the steering shaft 3, the intermediate shaft 4, and the like. Further, the rotation transmitted to the steering mechanism 5 is converted into an axial movement of a rack shaft (not shown). Thereby, a steered wheel is steered.

The steering shaft 3 includes a cylindrical upper shaft 3U and a lower shaft 3L that are fitted so as to be relatively slidable by, for example, spline fitting or serration fitting. The steering member 2 is connected to one end of the upper shaft 3U. Further, the steering shaft 3 can be expanded and contracted in the axial direction X.
The steering device 1 includes a hollow column jacket 6 that rotatably supports the steering shaft 3. The column jacket 6 includes a cylindrical upper jacket 7 and a lower jacket 8 fitted to the upper jacket 7.

  The steering shaft 3 is inserted into the column jacket 6 and is rotatably supported by the column jacket 6 via a plurality of bearings 9 and 10. The upper jacket 7 is connected to the upper shaft 3U via a bearing 9 so as to be able to move in the axial direction X. The lower jacket 8 supports the lower shaft 3L through a bearing 10 so as to be rotatable. When the upper jacket 7 moves in the axial direction X with respect to the lower jacket 8, the column jacket 6 can expand and contract in the axial direction X together with the steering shaft 3.

  The steering device 1 includes a fixed bracket 14 fixed to the vehicle body 13, a tilt central shaft 15 supported by the fixed bracket 14, and a column fixed to the outer periphery of the lower jacket 8 and rotatably supported by the tilt central shaft 15. A bracket 16. The column jacket 6 and the steering shaft 3 are rotatable (tiltable) in the tilt direction Y with the tilt center CC that is the center axis of the tilt center axis 15 as a fulcrum.

By rotating (tilting) the steering shaft 3 and the column jacket 6 around the tilt center CC, the position of the steering member 2 can be adjusted (so-called tilt adjustment). Further, the position of the steering member 2 can be adjusted by expanding and contracting the steering shaft 3 and the column jacket 6 in the axial direction X (so-called telescopic adjustment).
The steering device 1 is provided with a tilt lock and a telescopic mechanism by tightening a bracket 17 including a mounting plate 24 fixed to the vehicle body 13 and a pair of tightened portions 19 integrally provided on the upper portion of the lower jacket 8 in the axial direction X. And a tightening mechanism 18 that achieves locking.

As shown in FIG. 1 and FIG. 2, which is a schematic perspective view of the steering apparatus 1, the tightening mechanism 18 includes a tightening shaft 21 that is inserted into the tilting long hole 23 of the bracket 17 and tightens the pair of tightened portions 19. And an operating lever 20 as an operating member for rotating the tightening shaft 21. A central axis C <b> 1 of the fastening shaft 21 corresponds to the rotation center of the operation lever 20.
As shown in FIG. 2, the lower jacket 8 includes a slit 26 that extends downward from the upper end in the axial direction X. The pair of tightening portions 19 are arranged on both sides of the slit 26. By clamping the pair of fastened portions 19, the lower jacket 8 can be elastically reduced in diameter.

FIG. 3 is a cross-sectional view taken along line III-III in FIG. As shown in FIG. 3, the bracket 17 includes a mounting plate 24 attached to the vehicle body 13 and a pair of side plates 22 extending downward from the both ends of the mounting plate 24 in the tilt direction Y.
The lower jacket 8 forms a guide groove 27 extending in the axial direction X. A guided protrusion 28 fixed to the upper jacket 7 is fitted in the guide groove 27. The guide groove 27 regulates the rotation of the upper jacket 7 with respect to the lower jacket 8 while guiding the axial movement of the upper jacket 7 through the guided projections 28. Further, the end portion (not shown) of the guide groove 27 in the axial direction X is in contact with the guided projection 28, thereby preventing the upper jacket 7 from coming off from the lower jacket 8.

The pair of tightened portions 19 of the lower jacket 8 is disposed between the pair of side plates 22 and has a plate shape along the inner side surface 22 a of the corresponding side plate 22. The inner side surface 22 a of each side plate 22 faces the outer side surface 19 a of the corresponding tightened portion 19.
Each tightened portion 19 of the lower jacket 8 is formed with a tightening shaft insertion hole 29 formed of a circular hole through which the tightening shaft 21 is inserted. The tightening shaft 21, the lower jacket 8, the upper jacket 7, and the steering shaft 3 move integrally in the tilt direction Y during tilt adjustment.

  The tightening shaft 21 includes bolts that are inserted into the tilting long holes 23 of the side plates 22 of the bracket 17 and the tightening shaft insertion holes 29 of the both tightened portions 19 of the lower jacket 8. A large-diameter head portion 21 a provided at one end of the tightening shaft 21 is fixed to the operation lever 20 so as to be integrally rotatable. The tightening mechanism 18 is interposed between the head 21 a of the tightening shaft 21 and the one side plate 22, and the operation torque of the operation lever 20 is applied to the axial force of the tightening shaft 21 (tightening for tightening the pair of side plates 22. A force converting mechanism 30 that converts the applied force) is further provided.

The force conversion mechanism 30 is coupled to the operation lever 20 so as to be rotatable integrally with the operation lever 20, and the rotation cam 31 is restricted from moving in the tightening axis direction J that is the axial direction of the tightening shaft 21 with respect to the tightening shaft 21. And one fastening member 32 that is a non-rotating cam that is engaged with the cam 31 and fastens the one side plate 22.
The tightening mechanism 18 includes a nut 33 screwed into the screw portion 21 b at the other end of the tightening shaft 21, the other tightening member 34 that tightens the other side plate 22, and the other tightening member 34 and the nut 33. An interposition member 35 interposed therebetween is further provided. The interposition member 35 includes a washer 36 and a needle roller bearing 37.

The other fastening member 34 and the interposition member 35 are interposed between the nut 33 and the other side plate 22 of the bracket 17. The rotating cam 31, one fastening member 32 (non-rotating cam), the other fastening member 34, and the interposition member 35 are supported by the outer periphery of the fastening shaft 21.
One tightening member 32 (non-rotating cam) and the other tightening member 34 are tightened plate portions 32 a and 34 a for tightening the corresponding side plates 22, and boss portions fitted in the corresponding elongated elongated holes 23. 32b, 34b. The rotation of the fastening members 32 and 34 is restricted by the fitting of the boss portions 32b and 34b with the corresponding long slots 23 for tilt.

Further, one fastening member 32 (non-rotating cam) and the other fastening member 34 are supported by the fastening shaft 21 so as to be movable in the fastening axial direction J.
As the operation lever 20 rotates in the locking direction, the pair of side plates 22 of the bracket 17 are clamped and tightened between the rotating cam 31 and one tightening member 32 (non-rotating cam).

  As a result, each side plate 22 of the bracket 17 tightens the corresponding tightened portion 19 of the lower jacket 8. As a result, the movement of the lower jacket 8 in the tilt direction Y is restricted, and tilt lock is achieved. Further, by tightening both the tightened portions 19, the lower jacket 8 is elastically reduced in diameter and tightens the upper jacket 7. Thereby, the movement of the upper jacket 7 in the axial direction X is restricted, and telescopic locking is achieved. In this way, the tightening mechanism 18 achieves telescopic locking by friction between the jackets 7 and 8.

The steering device 1 further includes an impact absorbing mechanism 40 that absorbs an impact during a secondary collision.
FIG. 4 is an exploded perspective view around the shock absorbing mechanism 40. FIG. 5 is a cross-sectional view taken along line VV in FIG. In FIG. 5, the illustration of the bracket 17 is omitted for convenience of explanation.
Referring to FIG. 4, shock absorbing mechanism 40 includes a plurality of first friction plates 41 supported by upper jacket 7 so as to be integrally movable in axial direction X, and a plurality of first friction plates 41 supported by lower jacket 8 so as not to be axially movable. Second friction plate 42. Each first friction plate 41 is provided in parallel to the axial direction X. Each second friction plate 42 faces the corresponding first friction plate 41.

With reference to FIG. 5, a region where the second friction plate 42 and the first friction plate 41 overlap is referred to as a superposition region L. The overlapping region L is disposed between the pair of tightening portions 19. The plurality of first friction plates 41 and the plurality of second friction plates 42 alternately overlap in the overlapping region L.
A friction adjusting member 44 for adjusting the sliding friction between the first friction plate 41 and the second friction plate 42 is provided on the surfaces of the first friction plate 41 and the second friction plate 42.

  Examples of the friction adjusting member 44 include grease and a coating for reducing or increasing friction. The friction adjustment member 44 may be provided on both the first friction plate 41 and the second friction plate 42, or may be provided on one of the first friction plate 41 and the second friction plate 42. . Further, the friction adjusting member 44 may be provided on one or both surfaces of the first friction plate 41, or may be provided on one or both surfaces of the second friction plate 42.

Further, the shock absorbing mechanism 40 is a pressing member that presses the overlapping region L of the first friction plate 41 and the second friction plate 42 toward the outer surface 7a side of the upper jacket 7 between the pair of tightening portions 19 in a telescopic lock state. 43. A direction in which the pressing member 43 presses the overlapping region L toward the outer surface 7a is referred to as a pressing direction A.
The portion pressed by the pressing member 43 on the outer surface 7a of the upper jacket 7 preferably constitutes a plane perpendicular to the pressing direction A (see FIG. 3). The portion of the outer surface 7a that is pressed by the pressing member 43 may be an arc-shaped surface. In this case, the plurality of first friction plates 41 and the plurality of second friction plates 42 are preferably formed in an arc shape along the outer surface 7a.

The pressing member 43 integrally includes a supported portion 45 supported by the fastening shaft 21 and a pressing portion 46 that presses the overlapping region L against the outer surface 7 a of the upper jacket 7.
The supported portion 45 has a fitting hole 47 for fitting with the fastening shaft 21. The fitting hole 47 has a female spline 47 a that is spline-fitted with the male spline 21 c formed on the fastening shaft 21 on the inner periphery. The pressing portion 46 protrudes from the supported portion 45 toward the radially outer side of the fastening shaft 21 in a part of the circumferential direction of the fastening shaft 21.

Referring to FIG. 3, the fitting hole 47 is fitted to the fastening shaft 21 between the pair of tightened portions 19, and the female spline 47 a of the fitting hole 47 is connected to the male spline 21 c of the fastening shaft 21. Mating. Thereby, the pressing member 43 is supported by the fastening shaft 21 so as to be integrally rotatable between the pair of fastened portions 19.
Referring to FIG. 4, shock absorbing mechanism 40 includes a fixed shaft 50 that is inserted through insertion holes 41 a provided in each first friction plate 41 and is fixed to upper jacket 7, an outer periphery of fixed shaft 50, and insertion holes. 41a and an elastic member 51 that is interposed between the inner periphery of 41a. The fixed shaft 50 is provided so as to float and support the plurality of first friction plates 41 before and after the pressing direction 43 of the pressing member 43.

Here, referring to FIG. 5, the front side in the pressing direction A is the side (the outer surface 7 a side) that approaches the outer surface 7 a of the upper jacket 7 in the pressing direction A, and the rear side in the pressing direction A is the pressing direction. A side away from the outer surface 7 a of the upper jacket 7 at A.
The fixed shaft 50 is inserted through the insertion holes 41a of the plurality of first friction plates 41, and is provided at the shaft portion 50a extending in the pressing direction A and at the end portion of the shaft portion 50a, and has a larger diameter than the shaft portion 50a. Part 50b. The fixed shaft 50 is fixed to the upper jacket 7 by, for example, pressing the shaft portion 50 a into the fixing hole 7 b of the upper jacket 7.

The shaft portion 50a is not press-fitted into the insertion holes 41a of the plurality of first friction plates 41. The large-diameter portion 50b and the outer surface 7a of the upper jacket 7 move the plurality of first friction plates 41 in the pressing direction A. Separate as much as possible. Therefore, the plurality of first friction plates 41 can float back and forth in the pressing direction A between the large diameter portion 50 b and the outer surface 7 a of the upper jacket 7.
6 is a cross-sectional view taken along line VI-VI in FIG.

  Referring to FIG. 6, the elastic member 51 is formed, for example, by press-molding a plate-like metal, and has an end-cylinder shape having end portions 51 a in the circumferential direction. Between the end portions 51 a in the circumferential direction of the elastic member 51, a slit portion 51 b extending in the axial direction of the fixed shaft 50 is formed. The elastic member 51 is interposed between the outer periphery of the fixed shaft 50 and the inner periphery of the insertion hole 41a in a state of being elastically deformed so as to narrow the slit portion 51b. The elastic member 51 urges the inner periphery of the insertion hole 41 a of the first friction plate 41 in the radial direction R of the fixed shaft 50 by a restoring force that attempts to return to the state before elastic deformation.

Referring to FIG. 3, each of the inner side surfaces 19 b of the pair of tightening portions 19 has the end portions 42 a of the second friction plates 42 in the opposing direction of the pair of tightening portions 19 before and after the pressing direction A. A guiding groove 52 is included. The concave groove 52 supports the second friction plates 42 in a floating manner before and after the pressing direction A.
Referring to FIG. 7, which is a perspective view of the periphery of the end portion 42 a of the second friction plate 42, the concave groove 52 has a pair of guide surfaces 52 a as a pair of inner wall surfaces extending in the pressing direction A. The pair of guide surfaces 52a guide the movement of the plurality of second friction plates 42 in the pressing direction A. Further, the pair of guide surfaces 52 a restricts the movement of the second friction plate 42 in the axial direction X.

3 and 7, each of the pair of end portions 42a of each second friction plate 42 has a flange along the corresponding groove 52 (strictly, the pair of guide surfaces 52a of the groove 52). 53 is provided. Each of the pair of flanges 53 of each second friction plate 42 is accommodated in the concave groove 52 of the corresponding tightened portion 19 so as to be movable in the pressing direction A.
In the state where the tightening mechanism 18 shown in FIG. 3 achieves telescopic locking by friction between the jackets 7 and 8 (the steering device 1 is locked), as shown in FIG. 5, the pressing member 43 includes a plurality of first members. The overlapping region L of the friction plate 41 and the plurality of second friction plates 42 is pressed against the outer surface 7 a of the upper jacket 7.

When the operation lever 20 is rotated in the unlocking direction (direction opposite to the locking direction) from the locked state, the fastening shaft 21 rotates about the central axis C1. The rotation of the fastening shaft 21 is transmitted to the pressing member 43 via the male spline 21c and the female spline 47a. Thereby, the pressing member 43 rotates around the central axis C1.
By the rotation operation of the operation lever 20 in the unlocking direction, the fastening shaft 21 is rotated until the pressing of the pressing member 43 against the plurality of first friction plates 41 and the plurality of second friction plates 42 is released.

FIG. 8 is a view showing a state after the tightening shaft 21 is rotated from the state of FIG. 5, and shows a state in which the pressing of the pressing member 43 against the first friction plate 41 and the second friction plate 42 is released. FIG.
When the operating lever 20 is rotated in the locking direction from the unlocked state shown in FIG. 8, the fastening shaft 21 rotates about the central axis C1. The rotation of the fastening shaft 21 is transmitted to the pressing member 43 via the male spline 21c and the female spline 47a. As a result, the pressing member 43 rotates around the central axis C <b> 1 of the fastening shaft 21. By the rotation operation of the operation lever 20 in the locking direction, the fastening shaft 21 is rotated to the state shown in FIG.

Next, the operation of the steering device 1 at the time of a secondary collision will be described. Hereinafter, description will be made with reference to FIG. 9 which is a view showing the periphery of the shock absorbing mechanism 40 after the secondary collision.
Referring to FIG. 5, at the time of the secondary collision, the load from the steering member 2 is transmitted to the upper jacket 7, so that the upper jacket 7 and the lower jacket 8 are axially moved in the axial direction X so that the column jacket 6 is contracted in the axial direction X. Move relative to. A plurality of first friction plates 41 that can move integrally with the upper jacket 7 and a plurality of second friction plates 42 that are supported by the lower jacket 8 so as not to move in the axial direction relatively move in the axial direction X.

Since the steering device 1 is in a telescopic lock state during driving of the vehicle, the second friction corresponding to each of the first friction plates 41 as shown in FIG. The plate 42 slides. Therefore, an impact absorbing load is generated by sliding friction between the plurality of first friction plates 41 and the corresponding second friction plates 42.
According to the present embodiment, at the time of a secondary collision, the plurality of first friction plates 41 parallel to the axial direction X move integrally with the upper jacket 7 and slide with the corresponding second friction plates 42, thereby shock absorbing load. Will occur. Therefore, the space required outside the column jacket 6 to accommodate the shock absorbing mechanism 40 after the secondary collision is sufficient to accommodate the plurality of first friction plates 41. Therefore, since the space for accommodating the impact absorbing mechanism 40 after the secondary collision can be reduced, the degree of freedom in designing the entire steering device 1 can be improved.

Moreover, since the space for accommodating the shock absorbing mechanism 40 after the secondary collision can be reduced, an increase in size of the steering device 1 can be suppressed.
Further, in the locked state, the pressing member 43 presses the overlapping region L of the first friction plate 41 and the second friction plate 42, so that at the time of the secondary collision, the sliding is performed simultaneously with the movement of the upper jacket 7 with respect to the lower jacket 8. Dynamic friction and shock absorbing load are generated. Thereby, since the distance which the upper jacket 7 moves in order to absorb the impact at the time of a secondary collision can be shortened, the space for accommodating the impact absorption mechanism 40 after a secondary collision can be reduced further. .

In addition, since the overlapping region L of the plurality of first friction plates 41 and the plurality of second friction plates 42 is disposed between the pair of tightening portions 19, the overlapping region L is paired with the pair of tightening portions 19. Compared with the case where it is provided outside, the impact absorbing mechanism 40 can be reduced in size, and consequently the steering device 1 can be reduced in size.
Further, the first friction plate 41 and the second friction plate 42 are supported in a floating manner before and after the pressing direction 43 of the pressing member 43. Therefore, in a state where the overlapping region L between the first friction plate 41 and the second friction plate 42 is not pressed by the pressing member 43, that is, in a state where the telescopic lock is released, the first friction plate 41 and the second friction plate 42 are used. And sliding friction is reduced. Therefore, telescopic adjustment can be performed smoothly.

Further, the backlash between the first friction plate 41 and the fixed shaft 50 can be removed by the elastic member 51 for backlashing.
Further, since the second friction plate 42 is guided in the pressing direction A by the concave groove 52, it is possible to suppress the occurrence of the positional deviation of the second friction plate 42 with respect to the lower jacket 8.
Further, each end portion 42 a of the second friction plate 42 is provided with a flange 53 along the corresponding concave groove 52, thereby further suppressing the occurrence of displacement of the second friction plate 42 with respect to the lower jacket 8. Can do.

Further, the shock absorbing load can be adjusted by adjusting the sliding friction between the first friction plate 41 and the corresponding second friction plate 42 by the friction adjusting member 44.
The present invention is not limited to the embodiment described above, and various modifications can be made within the scope of the claims.
For example, the first friction plate 41 and the second friction plate 42 do not need to be provided in plural, and one or more each may be provided. Further, the same number of the first friction plates 41 and the second friction plates 42 need not be provided, and even if either one of the first friction plates 41 and the second friction plates 42 is larger than the other. Good.

Further, the friction adjusting member 44 may not be provided on any of the plurality of first friction plates 41 and the plurality of second friction plates 42.
Further, by adjusting the surface roughness (surface roughness) of the plurality of first friction plates 41 and the plurality of second friction plates 42, sliding friction between each first friction plate 41 and the corresponding second friction plate 42 is achieved. Can be adjusted. The sliding friction between each first friction plate 41 and the corresponding second friction plate 42 can also be adjusted by adjusting the number of the plurality of first friction plates 41 and the plurality of second friction plates 42.

  The steering device 1 is a so-called lever-mounted steering device in which a fastening shaft 21 to which the operation lever 20 is fixed is disposed above the upper jacket 7 in the tilt direction Z. The present invention can also be applied to a so-called lever bottom type steering device that is disposed below the upper jacket 7 in the tilt direction Z.

The steering device 1 is not limited to a manual type steering device in which steering of the steering member 2 is not assisted, but is a column assist type electric power steering that assists steering of the steering member 2 by applying the power of the electric motor to the steering shaft 3. An apparatus (C-EPS) may be used.
Further, the pressing member 43 may contact the first friction plate 41 or the second friction plate 42 to press the overlapping region L, or may press the overlapping region L via another member.

DESCRIPTION OF SYMBOLS 1 ... Steering device, 3 ... Steering shaft, 6 ... Column jacket, 7 ... Upper jacket, 7a ... Outer surface, 8 ... Lower jacket, 18 ... Tightening mechanism, 19 ... Tightened part, 19b ... Inner side surface, 20 ... Operation Lever, 21 ... clamping shaft, 26 ... slit, 40 ... shock absorbing mechanism, 41 ... first friction plate, 41a ... insertion hole, 42 ... second friction plate, 42a ... end, 43 ... pressing member, 50 ... fixed Axis 51: elastic member 52 ... concave groove 53 ... flange A: pressing direction L ... overlapping region X: axial direction

Claims (5)

An axially extendable steering shaft;
A lower jacket including a slit and a pair of tightened portions disposed on both sides of the slit; and an upper jacket fitted to the lower jacket, and rotatably supporting the steering shaft in the axial direction. An extendable column jacket,
A tightening mechanism including a tightening shaft for tightening the pair of tightened portions and an operation lever for rotating the tightening shaft, and achieving a telescopic lock by friction between both jackets;
A shock absorbing mechanism that absorbs a shock during a secondary collision,
The shock absorbing mechanism is
A first friction plate parallel to the axial direction supported by the upper jacket so as to be integrally movable in the axial direction;
A second friction plate that is supported by the lower jacket so as not to move in the axial direction, and that faces the first friction plate;
The pair of tightened portions are supported by the tightening shaft so as to be integrally rotatable, and in a telescopic lock state, the overlapping region of the first friction plate and the second friction plate is defined by the pair of tightened portions. A pressing member that presses against the outer surface side of the upper jacket in between,
A steering device configured to generate an impact absorbing load by sliding friction between the first friction plate and the second friction plate during a secondary collision.   The steering device according to claim 1, wherein the first friction plate and the second friction plate are supported in a floating manner before and after a pressing direction of the pressing member.   3. The shock absorbing mechanism according to claim 2, wherein the shock absorbing mechanism includes a fixed shaft that is inserted through an insertion hole provided in the first friction plate and is fixed to the upper jacket, an outer periphery of the fixed shaft, and an inner periphery of the insertion hole. A steering device, including an elastic member for removing a gap interposed therebetween.   4. The steering device according to claim 2, wherein each of the inner side surfaces of the pair of tightened portions includes a concave groove that guides a corresponding end portion of the second friction plate back and forth in the pressing direction.   The steering apparatus according to claim 4, wherein a flange along a corresponding groove is provided at each end of the second friction plate.

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