Patent Publication Number: US-2023136638-A1

Title: Steering device

Description:
TECHNICAL FIELD 
     The present disclosure relates to a steering device. 
     Priority is claimed on Japanese Patent Application No. 2020-058293, filed Mar. 27, 2020 and Japanese Patent Application No. 2020-058294, filed Mar. 27, 2020, the contents of which are incorporated herein by reference. 
     BACKGROUND ART 
     A certain steering device is provided with a telescopic function of adjusting front and rear positions of a steering wheel in accordance with a body difference or a driving posture of a driver. This type of the steering device includes an outer column supported by a vehicle body, an inner column held inside the outer column to be movable in a front-rear direction, and a telescopic mechanism that connects the outer column and the inner column to be movable forward and rearward. The inner column supports a steering shaft to be rotatable. A steering wheel is attached to a rear end portion of the steering shaft. 
     The steering device is equipped with a configuration that cushions an impact load applied to the driver in a process in which the inner column moves forward with respect to the outer column (collapse stroke), when a predetermined load acts on the steering wheel at the time of a secondary collision. For example, Patent Document 1 below discloses a configuration in which a guide projection formed in the telescopic mechanism is held in a guide groove formed in the outer column. 
     In the steering device according to Patent Document 1, the inner column is moved forward and rearward with respect to the outer column by a driving force of the telescopic mechanism during a telescopic operation. 
     On the other hand, when the predetermined load acts on the steering wheel at the secondary collision, the telescopic mechanism is separated from the outer column. Thereafter, the inner column and the telescopic mechanism try to move forward with respect to the outer column. In this case, the inner column moves forward while the guide projection spreads the guide groove. As a result, the steering device according to Patent Document 1 cushions the impact load applied to the driver at the secondary collision. 
     CITATION LIST 
     Patent Document 
     [Patent Document 1] 
     
         
         Japanese Unexamined Patent Application, First Publication No. 2006-347243 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     Incidentally, in order to efficiently cushion the impact load, it is conceivable that plastically deforming the guide groove is preferable. 
     However, in the above-described related art, when the guide groove is spread by the guide projection, a partition wall itself (outer column) forming the guide groove moves or deforms. Consequently, it is difficult to secure desired impact absorbing performance. 
     In the above-described related art, there is still room for improvement in terms of achieving stable impact absorbing performance at the secondary collision. Specifically, in the above-described related art, the guide projection is formed in a rectangular shape in a plan view. Therefore, the guide projection slides on an inner surface of the guide groove in a state where a corner portion is in contact with the inner surface of the guide groove. In this case, the corner portion of the guide projection is caught on the inner surface of the guide groove, and a load acting between the guide projection and the inner surface of the guide groove is likely to fluctuate. 
     The present disclosure provides a steering device which easily secures desired impact absorbing performance. 
     Solution to Problem 
     In order to solve the above-described problem, the present disclosure adopts the following aspects. 
     (1) According to an aspect of the present disclosure a steering device is provided including a pipe into which a steering shaft is inserted to be rotatable around an axis along a front-rear direction, a housing supported by a vehicle body and configured to support the pipe to be movable in the front-rear direction, a telescopic mechanism configured to move the pipe with respect to the housing in the front-rear direction, and a load absorbing mechanism configured to connect the pipe and the telescopic mechanism to each other. The telescopic mechanism includes an actuator coupled to the housing, and a feed mechanism having an engaging portion coupled to the actuator and an engaged portion coupled to the load absorbing mechanism and engaged with the engaging portion in the front-rear direction and configured to transmit a driving force of the actuator to the pipe via the engaging portion and the engaged portion. The load absorbing mechanism includes an extending portion coupled to any one member of the pipe and the feed mechanism and extending in the front-rear direction, a sliding portion provided on a first side in a left-right direction with respect to the extending portion in the other member of the pipe and the feed mechanism and configured to plastically deform the extending portion by moving relative to the one member while sliding on a side surface of the extending portion which faces the first side in the left-right direction, when a load acting on the pipe is a predetermined value or greater, and a restriction portion provided on a second side in the left-right direction with respect to the extending portion in the other member and configured to be movable in concert with the sliding portion, when the load acting on the pipe is the predetermined value or greater and to restrict movement or deformation of the extending portion to the second side in the left-right direction. 
     According to this aspect, when the load having the predetermined value or greater is applied to the pipe, at the time of a secondary collision, the pipe moves forward with respect to the housing. In this case, in a process in which the sliding portion slides on the side surface of the extending portion, the extending portion plastically deforms so that an impact load can be absorbed. 
     In particular, in this aspect, when the extending portion tries to move or deform to a side separated from the sliding portion due to a load acting between the sliding portion and the extending portion when the sliding portion slides, movement or deformation of the extending portion can be restricted by the restriction portion. In this manner, the extending portion can efficiently and plastically deform, and desired impact absorbing performance can be secured. 
     Moreover, in this aspect, the engaging portion and the engaged portion of the feed mechanism engage with each other in the front-rear direction. Therefore, at the secondary collision, forward movement of the feed mechanism with respect to the actuator is restricted. In this manner, at the secondary collision, it is possible to prevent the load absorbing mechanism from moving forward together with the feed mechanism. Therefore, a load can be effectively generated between the extending portion and the sliding portion. As a result, desired impact absorbing performance can be secured. 
     The actuator of the telescopic mechanism is fixed to the housing. Therefore, the actuator does not move during a telescopic operation or at the secondary collision. Therefore, a movement space of the actuator does not need to be secured around the steering device, and layout design can be improved. 
     (2) In the steering device according to the aspect (1), it is preferable that the restriction portion plastically deforms the extending portion by moving in concert with the sliding portion while sliding on the side surface of the extending portion which faces the second side in the left-right direction. 
     According to this aspect, as the sliding portion and the restriction portion move forward with respect to the extending portion, the extending portion plastically deforms and is squeezed by the sliding portion and the restriction portion. In this manner, it is possible to improve impact absorbing performance while the movement or the deformation of the extending portion in the left-right direction is restricted. 
     (3) In the steering device according to the aspect (1) or (2), it is preferable that the sliding portion and the restriction portion are formed line-symmetrically with respect to a symmetric line which extends along the front-rear direction through a center of the extending portion. 
     According to this aspect, a load acting among the sliding portion, the restriction portion, and the extending portion is likely to be uniform. 
     (4) In the steering device according to any one of the aspects (1) to (3), it is preferable that the one member is provided with a first guide located on a side opposite to the extending portion in the left-right direction with respect to the sliding portion, and configured to guide movement of the sliding portion in the front-rear direction, and a second guide located on a side opposite to the extending portion in the left-right direction with respect to the restriction portion, and configured to guide movement of the restriction portion in the front-rear direction. 
     According to this aspect, at the secondary collision, the sliding portion and the restriction portion can be smoothly moved in the front-rear direction along the extending portion. When the sliding portion and the restriction portion try to move or deform outward in the left-right direction due to the load acting among the extending portion, the sliding portion, and the restriction portion, the movement or the deformation of the sliding portion and the restriction portion can be restricted by the guide. 
     (5) In the steering device according to any one of the aspects (1) to (4), it is preferable that the extending portion is connected to the feed mechanism on the first side in the left-right direction, and is supported by the housing on the second side in the left-right direction. 
     According to this aspect, the extending portion is supported on both left and right sides. Therefore, the movement of the extending portion with respect to the housing in the left-right direction can be restricted. In this manner, at the secondary collision, it is possible to prevent the extending portion itself from being displaced in the left-right direction due to the load generated among the sliding portion, the restriction portion, and the extending portion. 
     (6) In the steering device according to any one of the aspects (1) to (5), it is preferable that the feed mechanism includes a shaft coupled to an output shaft of the actuator and having a male screw as the engaging portion, and a nut connected to the one member and having a female screw portion that engages with the male screw as the engaged portion. 
     According to this aspect, a feed screw mechanism is adopted as the feed mechanism. Therefore, it is easy to secure an engagement force between the male screw of the shaft and the female screw of the nut, and it is easy to adjust a stroke of the pipe with respect to a rotation amount of the actuator during the telescopic operation. In addition, an impact absorbing mechanism is coupled to the feed screw mechanism serving as the feed mechanism. Therefore, the nut is locked to the shaft at the secondary collision, and the forward movement of the feed mechanism (nut) is restricted. In this manner, at the secondary collision, it is possible to prevent the load absorbing mechanism from moving forward together with the feed mechanism. Therefore, a load can be effectively generated between the extending portion and the sliding portion. As a result, desired impact absorbing performance can be secured. 
     (7) In the steering device according to any one of the aspects (1) to (6), it is preferable that the load absorbing mechanism includes a restriction member configured to restrict movement of the extending portion in an up-down direction with respect to the sliding portion. 
     According to this aspect, the movement of the extending portion in the up-down direction with respect to the sliding portion is restricted. As a result, the sliding portion can be prevented from being separated from the extending portion, and absorbed energy absorbed by the load absorbing mechanism can be stabilized over an entire region of a collapse stroke. 
     (8) According to another aspect of the present disclosure, there is provided a steering device including a pipe into which a steering shaft is inserted to be rotatable around an axis along a front-rear direction, a housing supported by a vehicle body and configured to support the pipe to be movable in the front-rear direction, a telescopic mechanism configured to move the pipe with respect to the housing in the front-rear direction, and a load absorbing mechanism configured to connect the pipe and the telescopic mechanism to each other. The telescopic mechanism includes an actuator coupled to the housing, and a feed mechanism having an engaging portion coupled to the actuator and an engaged portion coupled to the load absorbing mechanism and engaged with the engaging portion in the front-rear direction and configured to transmit a driving force of the actuator to the pipe via the engaging portion and the engaged portion. The load absorbing mechanism includes an extending portion coupled to any one member of the pipe and the feed mechanism and extending in the front-rear direction, a first sliding portion provided on a first side in a left-right direction with respect to the extending portion in the other member of the pipe and the feed mechanism, and configured to move relative to the one member while sliding on a side surface of the extending portion which faces the first side in the left-right direction, when a forward load acting on the pipe is a predetermined value or greater, and a second sliding portion provided on a second side in the left-right direction with respect to the extending portion in the other member and configured to move in concert with the first sliding portion while sliding on a side surface of the extending portion which faces the second side in the left-right direction, when the load acting on the pipe is the predetermined value or greater. Each of a first contact portion of the first sliding portion which comes into contact with the extending portion and a second contact portion of the second sliding portion which comes into contact with the extending portion forms a curved surface projecting toward the extending portion. 
     According to this aspect, when the load having the predetermined value or greater is applied to the pipe, at the time of a secondary collision, the pipe moves forward with respect to the housing. In this case, in a process in which the sliding portion slides on the side surface of the extending portion, the extending portion or the sliding portion plastically deforms so that the impact load can be absorbed. 
     In particular, in this aspect, each contact portion has the curved surface. Therefore, when the sliding portion slides on the extending portion during the collapse stroke generated due to the secondary collision, the pressing portion and the extending portion can be prevented from being caught on each other. In this manner, the sliding portion can be smoothly moved on the extending portion. Accordingly, the impact load can be efficiently cushioned over the entire collapse stroke. Therefore, the impact absorbing performance can be improved. 
     In this aspect, the engaging portion and the engaged portion of the telescopic mechanism engage with each other in the front-rear direction. Therefore, at the secondary collision, the forward movement of the feed mechanism with respect to the actuator is restricted. In this manner, at the secondary collision, it is possible to prevent the load absorbing mechanism from moving forward together with the feed mechanism. Therefore, a load can be effectively generated between the extending portion and the sliding portion. As a result, desired impact absorbing performance can be secured. 
     The actuator of the telescopic mechanism is fixed to the housing. Therefore, the actuator does not move during a telescopic operation and at the secondary collision. Therefore, a movement space of the actuator does not need to be secured around the steering device, and layout designing can be improved. 
     (9) In the steering device according to the aspect (8), it is preferable that the extending portion includes a narrow portion that is narrower than a distance between the first contact portion and the second contact portion in the left-right direction, and a wide portion that is wider than a distance between the first contact portion and the second contact portion in the left-right direction, and configured to be plastically deformable when the first sliding portion and the second sliding portion slide. 
     According to this aspect, an outward bulging portion of the wide portion in the left-right direction with respect to the narrow portion functions as a deformable portion which is plastically deformable by the sliding portion (contact portion) during the collapse stroke generated due to the secondary collision. In this aspect, as described above, the contact portion and the extending portion can be prevented from being caught on each other as described above. Therefore, it is easy to secure a tightening allowance (overlapping range in a front view) between the sliding portion and the deformable portion. 
     (10) In the steering device according to the aspect (8) or (9), it is preferable that an outer peripheral surface of the first sliding portion extends to a side separated from the extending portion as the outer peripheral surface is directed toward both sides in the front-rear direction with respect to the first contact portion, and an outer peripheral surface of the second sliding portion extends to a side separated from the extending portion as the outer peripheral surface is directed toward both sides in the front-rear direction with respect to the second contact portion. 
     According to this aspect, it is possible to prevent a portion of the sliding portion other than the contact portion from coming into contact with the extending portion during the collapse stroke. In this manner, a contact position of the sliding portion in contact with the extending portion can be stabilized, and it is easy to secure desired impact absorbing performance. 
     (11) In the steering device according to any one of the aspects (8) to (10), it is preferable that the one member is provided with a first guide located on a side opposite to the extending portion in the left-right direction with respect to the first sliding portion, and configured to guide movement of the first sliding portion in the front-rear direction, and a second guide located on a side opposite to the extending portion in the left-right direction with respect to the second sliding portion, and configured to guide movement of the second sliding portion in the front-rear direction. 
     According to this aspect, the respective sliding portions can be smoothly moved in the front-rear direction along the extending portion during the collapse stroke generated due to the secondary collision. When the respective sliding portions tries to move or deform outward in the left-right direction due to the load acting between the extending portion and the respective sliding portions, elastic deformation of the respective sliding portions can be restricted by the guide. 
     (12) In the steering device according to the aspect (11), it is preferable that a facing surface facing the first guide in the first sliding portion is formed into a flat surface along the front-rear direction, and a facing surface facing the second guide in the second sliding portion is formed into a flat surface along the front-rear direction. 
     According to this aspect, the sliding portion is smoothly guided along the facing surface of the guide which faces the sliding portion during the collapse stroke generated due to the secondary collision. 
     (13) In the steering device according to any one of the aspects (8) to (12), it is preferable that the feed mechanism includes a shaft coupled to an output shaft of the actuator and having a male screw as the engaging portion, and a nut connected to the one member and having a female screw portion that engages with the male screw as the engaged portion. 
     According to this aspect, a feed screw mechanism is adopted as the feed mechanism. Therefore, it is easy to secure an engagement force between the male screw of the shaft and the female screw of the nut, and it is easy to adjust a stroke of the pipe with respect to a rotation amount of the actuator during the telescopic operation. The impact absorbing mechanism is coupled to the feed screw mechanism serving as the feed mechanism. Therefore, the nut is locked to the shaft at the secondary collision, and the forward movement of the feed mechanism (nut) is restricted. In this manner, at the secondary collision, it is possible to prevent the load absorbing mechanism from moving forward together with the feed mechanism. Therefore, a load can be effectively generated between the extending portion and the sliding portion. As a result, desired impact absorbing performance can be secured. 
     (14) In the steering device according to any one of the aspects (8) to (13), it is preferable that the load absorbing mechanism includes a restriction member that restricts movement of the extending portion in an up-down direction with respect to the first sliding portion and the second sliding portion. 
     According to this aspect, the movement of the extending portion in the up-down direction with respect to the sliding portion is restricted. As a result, the sliding portion can be prevented from being separated from the extending portion, and absorbed energy absorbed by the load absorbing mechanism can be stabilized over an entire region of a collapse stroke. 
     Advantageous Effects of Invention 
     According to the above-described respective aspects, desired impact absorbing performance can be secured. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view of a steering device. 
         FIG.  2    is a sectional view taken along line II-II in  FIG.  1   . 
         FIG.  3    is a sectional view taken along line III-III in  FIG.  1   . 
         FIG.  4    is an exploded perspective view of a load absorbing mechanism. 
         FIG.  5    is an enlarged view of the load absorbing mechanism. 
         FIG.  6    is a view taken along an arrow VI in  FIG.  3   . 
         FIG.  7    is a view for describing an operation at the time of a secondary collision. 
         FIG.  8    is a bottom view of an EA block according to a modification example. 
         FIG.  9    is a bottom view of an EA block according to a modification example. 
         FIG.  10    is a bottom view of an EA block according to a modification example. 
         FIG.  11    is a bottom view of an EA block according to a modification example. 
         FIG.  12    is a bottom view of an EA block according to a modification example. 
         FIG.  13    is a rear view of an EA block according to a modification example. 
         FIG.  14    is a rear view of an EA block according to a modification example. 
         FIG.  15    is a bottom view of an EA block according to a modification example. 
         FIG.  16    is a bottom view of an EA block according to a modification example. 
         FIG.  17    is an enlarged bottom view of a steering device according to a second embodiment. 
         FIG.  18    is a view representing the steering device according to the second embodiment and is a sectional view corresponding to  FIG.  3   . 
         FIG.  19    is a view representing a steering device according to a modification example and is a sectional view corresponding to line XIX-XIX line in  FIG.  8   . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings. In the embodiments or modification examples described below, the same reference numerals will be assigned to corresponding configurations, and description thereof may be omitted in some cases. In the following description, for example, expressions indicating relative or absolute dispositions such as “parallel”, “perpendicular”, “center”, and “coaxial” not only strictly represent the disposition, but also represent a state of relative displacement with an angle or a distance to such an extent that tolerances or the same functions can be obtained. 
     [Steering Device  1 ] 
       FIG.  1    is a perspective view of a steering device  1 . 
     As represented in  FIG.  1   , the steering device  1  is mounted on a vehicle. The steering device  1  adjusts a steering angle of vehicle wheels in accordance with a rotational operation of a steering wheel  2 . 
     The steering device  1  includes a housing  11 , a pipe  12 , a steering shaft  13 , a drive mechanism  14 , and a load absorbing mechanism  15 . The pipe  12  and the steering shaft  13  each are formed along an axis O 1 . Therefore, in the following description, an extending direction of the axis O 1  of the pipe  12  and the steering shaft  13  will be simply referred to as a shaft axial direction, a direction perpendicular to the axis O 1  will be simply referred to as a shaft radial direction, and a direction around the axis O 1  will be simply referred to as a shaft circumferential direction, in some cases. 
     The steering device  1  according to the present embodiment is mounted on a vehicle in a state where the axis O 1  intersects with a front-rear direction. Specifically, the axis O 1  of the steering device  1  extends upward as the steering device  1  is directed rearward. However, in the following description, for the sake of convenience, in the steering device  1 , a direction toward the steering wheel  2  in the shaft axial direction will be simply referred to as rearward, and a direction toward a side opposite to the steering wheel  2  will be simply referred to as forward (arrow FR). In the shaft radial direction, an up-down direction in a state where the steering device  1  is attached to the vehicle will be simply referred to as an up-down direction (arrow UP represents upward), and a left-right direction in the same state will be simply referred to as a left-right direction (arrow LH represents a left side). 
     &lt;Housing  11 &gt; 
       FIG.  2    is a sectional view taken along line II-II in  FIG.  1   .  FIG.  3    is a sectional view taken along line III-III in  FIG.  1   . 
     As represented in  FIGS.  1  to  3   , the housing  11  includes a tilt bracket  21  and a housing body  22 . 
     The tilt bracket  21  includes a pair of left and right side frames  23   a  and  23   b , attachment stays  24  formed in the respective side frames  23   a  and  23   b , and a bridge  25  for bridging the respective side frames  23   a  and  23   b.    
     The side frames  23   a  and  23   b  extend in the front-rear direction while the left-right direction is used as a thickness direction. Out of lower end edges of the side frames  23   a  and  23   b , a protruding piece  27  is formed in a front end portion of the side frame  23   a  on one side (left side). The protruding piece  27  protrudes downward from the front end portion of one side frame  23   a.    
     Each of the attachment stays  24  projects outward in the left-right direction from upper end portions of the side frames  23   a  and  23   b . The housing  11  is supported by a vehicle body via the attachment stay  24 . 
     The bridge  25  integrally bridges the upper end portions of the respective side frames  23 . Each of the bridges  25  is provided in both front and rear end portions in the side frames  23 . 
     The housing body  22  is disposed inside the tilt bracket  21 . The housing body  22  has a holding cylinder  31  and a front extending portion  32 . 
     The holding cylinder  31  is formed in a cylindrical shape extending in the shaft axial direction (front-rear direction). As represented in  FIG.  2   , an outer ring of a front bearing  35  is fitted (press-fitted) to a front end portion inside the holding cylinder  31 . As represented in  FIGS.  1  to  3   , a slit  36  is formed in an intermediate portion of the holding cylinder  31  in the front-rear direction. The slit  36  extends in the front-rear direction. 
     As represented in  FIG.  3   , in the holding cylinder  31 , protruding walls (first protruding wall  38  and second protruding wall  39 ) are formed in opening edges of the slit  36 . The first protruding wall  38  protrudes downward from a right opening edge in the opening edges of the slit  36 . The first protruding wall  38  extends in the front-rear direction along the right opening edge of the slit  36 . 
     The second protruding wall  39  protrudes downward from a left opening edge in the opening edges of the slit  36 . The second protruding wall  39  extends in the front-rear direction along the left opening edge of the slit  36 . The second protruding wall  39  has a recess portion  39   a  which is open downward. 
     As represented in  FIG.  1   , the front extending portion  32  protrudes forward from the holding cylinder  31 . The front extending portion  32  is formed in a U-shape which is open downward in a sectional view perpendicular to the front-rear direction. In the represented example, a distance between the pair of side walls  37  facing each other in the left-right direction in the front extending portion  32  is longer than an outer diameter of the holding cylinder  31 . The side walls  37  each are coupled to the side frames  23   a  and  23   b  facing each other in the tilt bracket  21  via a pivot shaft  40 . In this manner, the housing body  22  is supported by the tilt bracket  21  to be pivotable around the pivot shaft  40  (around an axis O 2  extending in the left-right direction). 
     &lt;Pipe  12 &gt; 
     The pipe  12  is formed in a cylindrical shape extending in the shaft axial direction. The pipe  12  is inserted into the holding cylinder  31 . The pipe  12  is configured to be movable in the shaft axial direction with respect to the holding cylinder  31 . As represented in  FIG.  2   , an outer ring of a rear bearing  41  is fitted (press-fitted) to a rear end portion of the pipe  12 . 
     &lt;Steering Shaft  13 &gt; 
     The steering shaft  13  includes an inner shaft  42  and an outer shaft  43 . 
     The inner shaft  42  is formed in a cylindrical shape extending in the shaft axial direction. The inner shaft  42  is inserted into the pipe  12 . A rear end portion of the inner shaft  42  is press-fitted to an inner ring of the rear bearing  41 . In this manner, the inner shaft  42  is supported to be rotatable around the axis O 1  via the rear bearing  41 . The steering wheel  2  is coupled to a portion protruding rearward from the pipe  12  in the inner shaft  42 . The inner shaft  42  may be solid. 
     The outer shaft  43  is formed in a cylindrical shape extending in the shaft axial direction. The outer shaft  43  is inserted into the pipe  12 . The inner shaft  42  is inserted into a rear end portion of the outer shaft  43  inside the pipe  12 . A front end portion of the outer shaft  43  is press-fitted to an inner ring of the front bearing  35  inside the holding cylinder  31 . In this manner, the outer shaft  43  is supported to be rotatable around the axis O 1  inside the holding cylinder  31 . 
     The inner shaft  42  and the pipe  12  are configured to be movable in the shaft axial direction with respect to the outer shaft  43 . An outer peripheral surface of the inner shaft  42  has a male spline, for example. The male spline engages with a female spline formed on an inner peripheral surface of the outer shaft  43 . In this manner, while relative rotation with respect to the outer shaft  43  is restricted, the inner shaft  42  moves in the shaft axial direction with respect to the outer shaft  43 . However, a telescopic structure or a rotation restriction structure of the steering shaft  13  can be appropriately changed. In the present embodiment, a configuration has been described in which the outer shaft  43  is disposed forward of the inner shaft  42 . However, the present embodiment is not limited only to this configuration. A configuration may be adopted so that the outer shaft  43  is disposed behind the inner shaft  42 . 
     &lt;Drive Mechanism  14 &gt; 
     As represented in  FIG.  1   , the drive mechanism  14  includes a tilt mechanism  45  and a telescopic mechanism  46 . For example, the tilt mechanism  45  is disposed on the left side of the housing  11 . For example, the telescopic mechanism  46  is disposed on the right side of the housing  11 . The drive mechanism  14  may have at least the telescopic mechanism  46 . 
     The tilt mechanism  45  forms a so-called feed screw mechanism. Specifically, the tilt mechanism  45  includes a tilt motor unit  51 , a tilt coupling portion  52 , and a tilt movable portion  53 . The tilt mechanism  45  switches between restriction and allowance of the steering device  1  pivoting around the axis O 2  by driving the tilt motor unit  51 . 
     The tilt motor unit  51  includes a tilt gear box  55  and a tilt motor  56 . 
     The tilt gear box  55  is attached to a front end portion of the side frame  23   a  in a state of projecting outward from the side frame  23   a  in the left-right direction. 
     The tilt motor  56  is attached to the tilt gear box  55  from behind in a state where an output shaft (not represented) is directed forward. An output shaft of the tilt motor  56  is connected to a speed reduction mechanism (not represented) inside the tilt gear box  55 . 
     The tilt coupling portion  52  includes a tilt wire  61 , a tilt shaft  62 , and a tilt coupling  63  that couples the tilt wire  61  and the tilt shaft  62  to each other. 
     The tilt coupling  63  is supported by a protruding piece  27  to be rotatable around an axis O 3  extending in the left-right direction. 
     The tilt wire  61  bridges the tilt gear box  55  and the tilt coupling  63 . The tilt wire  61  is configured to be rotatable in accordance with driving of the tilt motor  56 . The tilt wire  61  is configured to be flexibly deformable. A connection member connecting the tilt gear box  55  and the tilt coupling  63  to each other is not limited to those which are flexibly deformable like the tilt wire  61 . That is, depending on a layout of the tilt gear box  55  and the tilt coupling  63 , the tilt gear box  55  and the tilt coupling  63  may be connected to each other by a connection member which does not flexibly deform. 
     The tilt shaft  62  bridges the tilt coupling  63  and the tilt movable portion  53 . The tilt shaft  62  is rotated together with the tilt wire  61  in accordance with the driving of the tilt motor  56 . A male screw portion is formed on an outer peripheral surface of the tilt shaft  62 . 
     The tilt movable portion  53  includes a link member  70  and a tilt nut  71 . 
     The link member  70  is formed in a U-shape which is open upward. The link member  70  has side walls  70   a  and  70   b  facing each other in the left-right direction. The side wall  70   a  is disposed between the holding cylinder  31  and the side frame  23   a . The side wall  70   b  is disposed between the holding cylinder  31  and the side frame  23   b.    
     The side wall  70   a  and the side frame  23   a  are coupled to each other by a first bolt  75  extending in the left-right direction. The side wall  70   b  and the side frame  23   b  are coupled to each other by a first bolt (not represented). In this manner, the link member  70  is supported by the tilt bracket  21  to be pivotable around an axis O 4  extending in the left-right direction. 
     The side wall  70   a  and the holding cylinder  31  are coupled to each other by a second bolt  76  extending in the left-right direction. The side wall  70   b  and the holding cylinder  31  are coupled to each other by the second bolt  76 . The second bolt  76  is disposed behind the first bolt  75 . In this manner, the link member  70  is supported by the holding cylinder  31  to be pivotable around an axis O 5  extending parallel to the axis O 4 . 
     The tilt nut  71  is attached to a lower side of the side wall  70   a . A female screw portion is formed on an inner peripheral surface of the tilt nut  71 . The tilt shaft  62  meshes with the tilt nut  71 . The tilt nut  71  is configured so that a position on the tilt shaft  62  can be changed in accordance with the rotation of the tilt shaft  62 . 
     The telescopic mechanism  46  forms a so-called feed screw mechanism. Specifically, the telescopic mechanism  46  includes a telescopic motor unit (actuator)  81 , a telescopic coupling portion  82 , and a telescopic movable portion  83 . The telescopic mechanism  46  switches between restriction and allowance of forward and rearward movements of the pipe  12  (steering shaft  13 ) with respect to the housing  11  by driving the telescopic motor unit  81 . 
     The telescopic motor unit  81  includes a telescopic gear box  85  and a telescopic motor  86 . 
     The telescopic gear box  85  is attached in a state of projecting outward from the front extending portion  32  in the left-right direction. Therefore, the telescopic motor unit  81  is configured to be pivotable around the axis O 2  integrally with the housing body  22  by a driving force of the tilt mechanism  45 . 
     The telescopic motor  86  is attached to the telescopic gear box  85  from behind in a state where an output shaft (not represented) is directed forward. An output shaft of the telescopic motor  86  is connected to a speed reduction mechanism inside the telescopic gear box  85 . The telescopic motor unit  81  may be supported by the tilt bracket  21  via a wire. 
       FIG.  4    is an exploded perspective view of the load absorbing mechanism  15 . 
     As represented in  FIG.  4   , the telescopic coupling portion  82  extends rearward from the telescopic gear box  85 . The telescopic coupling portion  82  rotates around the axis in accordance with the driving of the telescopic motor  86 . A male screw portion  82   a  is formed on an outer peripheral surface of the telescopic coupling portion  82 . 
     The telescopic movable portion  83  is connected to the pipe  12  via the load absorbing mechanism  15 . A female screw portion  83   a  is formed on an inner peripheral surface of the telescopic movable portion  83 . The telescopic coupling portion  82  meshes with the telescopic movable portion  83 . The telescopic movable portion  83  engages (is in contact) with the male screw portion  82   a  in the front-rear direction via the female screw portion  83   a . The telescopic movable portion  83  is configured to be movable on the telescopic coupling portion  82  in accordance with the rotation of the telescopic coupling portion  82 . 
     &lt;Load Absorbing Mechanism  15 &gt; 
     As represented in  FIGS.  3  and  4   , the load absorbing mechanism  15  connects the telescopic movable portion  83  and the pipe  12  to each other. The load absorbing mechanism  15  transmits a driving force of the telescopic mechanism  46  to the pipe  12  during a telescopic operation when a load acting on the pipe  12  in the front-rear direction is smaller than a predetermined value and moves the pipe  12  together with the telescopic movable portion  83  in the front-rear direction with respect to the housing  11 . When the load acting on the pipe  12  is equal to or greater than the predetermined value, at the secondary collision, the load absorbing mechanism  15  moves the pipe  12  in the front-rear direction with respect to the housing  11  independently of the telescopic mechanism  46 . Specifically, the load absorbing mechanism  15  includes a hanger bracket  100 , an energy absorbing (EA) block  101 , and an EA plate  102 . 
     The hanger bracket  100  is fixed to a lower portion of the pipe  12  in a front portion of the pipe  12 . In the present embodiment, the hanger bracket  100  is fixed to the outer peripheral surface of the pipe  12  by means of welding. The hanger bracket  100  is disposed inside the slit  36 . 
     The EA block  101  is provided below the hanger bracket  100 . For example, the EA block  101  is integrally formed of a sintered material having an iron-based material. The EA block  101  includes a fixing plate  110 , a first sliding portion  111 , and a second sliding portion  112 . 
     The fixing plate  110  overlaps the hanger bracket  100  from below. The fixing plate  110  is fixed to the hanger bracket  100  by means of screwing. The EA block  101  may be directly fixed to the pipe  12 . 
     The first sliding portion  111  and the second sliding portion  112  face each other in the left-right direction. The first sliding portion  111  and the second sliding portion  112  protrude downward from the fixing plate  110 . The respective sliding portions  111  and  112  protrude outward of the housing body  22  through the slit  36 . In a plan view, the respective sliding portions  111  and  112  are formed line-symmetrically with respect to a symmetric line extending in the front-rear direction through a center of an extending portion  150  (to be described later). Therefore, in the following description, the first sliding portion  111  will be described as an example. 
       FIG.  5    is an enlarged view of the load absorbing mechanism  15 . 
     As represented in  FIG.  5   , the first sliding portion  111  is formed in an oval shape in a plan view while the front-rear direction is used as a longitudinal direction. An outer peripheral surface of the first sliding portion  111  has a guide surface  121 , a contact surface  122 , a flank  123 , and a connection surface  124 . 
     The guide surface  121  forms a portion of a surface facing outward in the left-right direction (outer surface) on the outer peripheral surface of the first sliding portion  111 . The guide surface  121  is a flat surface extending along the front-rear direction. However, the guide surface  121  may be a curved surface. 
     The contact surface  122  is connected to a front end edge of the guide surface  121 . The contact surface  122  forms a front end portion of a surface facing inward in the left-right direction (inner surface) from the front end portion of the outer surface via the front surface, on the outer peripheral surface of the first sliding portion  111 . The contact surface  122  is formed on a curved surface projecting forward. In the represented example, the contact surface  122  is formed in a semicircular shape having a uniform radius of curvature and a central angle of approximately 180°. A portion located on the innermost side (hereinafter, referred to as a pressing portion  122   a ) of the contact surface  122  in the left-right direction is located on the innermost side of the outer peripheral surface of the first sliding portion  111  in the left-right direction. An interval between the respective sliding portions  111  and  112  in the left-right direction is minimized (distance L 1 ) between the pressing portions  122   a.    
     The flank  123  extends rearward from an inner end edge of the contact surface  122  in the left-right direction. The flank  123  forms a portion of the inner surface of the first sliding portion  111 . The flank  123  is formed on an inclined surface extending outward in the left-right direction as the flank  123  is directed rearward. Therefore, the interval between the respective sliding portions  111  and  112  in the left-right direction gradually increases as the respective sliding portions  111  and  112  are directed rearward. 
     The connection surface  124  bridges rear end edges of the guide surface  121  and the flank  123 . The connection surface  124  forms the rear end portion of the outer surface from the rear end portion of the inner surface via the rear surface, on the outer peripheral surface of the first sliding portion  111 . A boundary portion on the connection surface  124  between the guide surface  121  and the flank  123  is rounded. 
     As represented in  FIGS.  3  and  4   , the EA plate  102  includes a main plate  130  and a sub plate  131 . 
     The main plate  130  is formed in a crank shape in a front view when viewed in the front-rear direction. The main plate  130  is formed of a material (for example, SPHC) having rigidity lower than that of the EA block  101 . The main plate  130  includes an attachment piece  132 , a coupling piece  133 , an operating piece  134 , and a support piece  135 . 
     The attachment piece  132  is formed in a plate shape while the up-down direction is set as the thickness direction. The attachment piece  132  is attached to the above-described telescopic movable portion  83  from above. The EA plate  102  is configured to be movable forward and rearward integrally with the telescopic movable portion  83 . 
     The coupling piece  133  extends downward from an inner end edge of the attachment piece  132  in the left-right direction. 
     The operating piece  134  extends inward in the left-right direction from a lower end edge of the coupling piece  133 . The operating piece  134  covers the pipe  12  from below. The rear end portion of the operating piece  134  overlaps the EA block  101  (sliding portions  111  and  112 ) in a plan view. A long hole (first long hole  140  and second long hole  141 ) is formed in the operating piece  134 . 
     The support piece  135  extends upward from an end edge of the operating piece  134  which is located on a side opposite to the coupling piece  133 . An upper end portion of the support piece  135  is accommodated inside the above-described recess portion  39   a . A guide rail  144  is provided inside the recess portion  39   a . The guide rail  144  is formed in a U-shape which is open downward and extends in the front-rear direction inside the recess portion  39   a . The guide rail  144  is fitted into the recess portion  39   a  to cover the inner surface of the recess portion  39   a . The guide rail  144  is formed of a material (for example, a resin material) in which frictional resistance generated with the support piece  135  is lower than frictional resistance acting between the support piece  135  and the inner surface of the recess portion  39   a . The support piece  135  is accommodated inside the above-described guide rail  144 . That is, the guide rail  144  guides the movement in the front-rear direction while restricting the movement of the main plate  130  (EA plate  102 ) in the left-right direction with respect to the housing body  22 . 
     The sub plate  131  connects the telescopic movable portion  83  and the operating piece  134  to each other. Specifically, an outer end portion of the sub plate  131  in the left-right direction is attached to the telescopic movable portion  83  from below. That is, the sub plate  131  pinches the telescopic movable portion  83  with the above-described attachment piece  132  in the up-down direction. An inner end portion of the sub plate  131  in the left-right direction is connected to the operating piece  134 . 
       FIG.  6    is a view taken along an arrow VI in  FIG.  3   . 
     Here, as represented in  FIGS.  5  and  6   , each of the above-described long holes  140  and  141  penetrates the operating piece  134  in the up-down direction and extends in the front-rear direction. The respective long holes  140  and  141  are formed line-symmetrically with respect to a symmetric line extending in the front-rear direction through the center of the extending portion  150  (to be described later) in a plan view. Therefore, in the following description, the first long hole  140  will be described as an example. 
     The first long hole  140  includes enlarged portions (front enlarged portion  145  and rear enlarged portion  146 ) located in both end portions in the front-rear direction, and a transition portion  147  connecting the enlarged portions  145  and  146  to each other. 
     The transition portion  147  linearly extends in the front-rear direction. In the transition portion  147 , an outward facing side surface  147   a  facing outward in the left-right direction and an inward facing side surface  147   b  facing inward in the left-right direction are formed into flat surfaces extending parallel to each other along the front-rear direction. 
     As represented in  FIG.  6   , the width (maximum width) of the front enlarged portion  145  in the left-right direction is wider than the width (maximum width) of the transition portion  147  in the left-right direction. The front enlarged portion  145  bulges inward in the left-right direction with respect to the outward facing side surface  147   a  of the transition portion  147 . The inner peripheral surface of the front enlarged portion  145  is formed on a curved surface. 
     As represented in  FIG.  5   , the width (maximum width) of the rear enlarged portion  146  in the left-right direction is wider than the width (maximum width) of the transition portion  147  in the left-right direction. The rear enlarged portion  146  bulges inward in the left-right direction with respect to the outward facing side surface  147   a  of the transition portion  147 . The front end portion of the rear enlarged portion  146  is connected to the outward facing side surface  147   a  of the transition portion  147  via an inclined surface  146   a  extending outward in the left-right direction as the front end portion is directed forward. The above-described first sliding portion  111  is fitted into the rear enlarged portion  146 . The guide surface  121  of the first sliding portion  111  is close to or in contact with the inward facing side surface  146   b  of the rear enlarged portion  146 . The pressing portion  122   a  of the first sliding portion  111  is close to or in contact with the outward facing side surface  146   c  of the rear enlarged portion  146 . 
     As represented in  FIGS.  4 ,  5 , and  6   , a portion of the operating piece  134  which is located between the respective long holes  140  and  141  forms the extending portion  150  extending in the front-rear direction. The extending portion  150  includes a front constriction portion  151 , a rear constriction portion (narrow portion)  152 , and a wide portion  153 . The front constriction portion  151  is a portion located between the front enlarged portions  145 . The rear constriction portion  152  is a portion located between the rear enlarged portions  146 . The width of each of the constriction portions  151  and  152  in the left-right direction is set to be equal to or smaller than the distance L 1  between the pressing portions  122   a  of the respective sliding portions  111  and  112 . 
     A portion bulging outward in the left-right direction with respect to each of the constriction portions  151  and  152  in the wide portion  153  forms a deformable portion  155 . In a front view, the deformable portion  155  overlaps at least the pressing portion  122   a  of the contact surfaces  122  of the respective sliding portions  111  and  112  in the front view. The deformable portion  155  is configured to be plastically deformable in such a manner that the respective sliding portions  111  and  112  (pressing portions  122   a ) slides when a predetermined load is input forward to the EA block  101  at the secondary collision. Therefore, the deformable portion  155  is not deformable when the load acting on the EA block  101  via the pipe  12  is smaller than a predetermined value (for example, during the telescopic operation). When the load acting on the pipe  12  is smaller than the predetermined value, the relative movement of the EA block  101  with respect to the EA plate  102  is restricted in a state where the respective sliding portions  111  and  112  are fitted into the respective rear enlarged portions  146 . 
     A portion of the operating piece  134  which is located on a side opposite to the extending portion  150  (outside in the left-right direction) with respect to the respective long holes  140  and  141  forms a guide  156  extending in the front-rear direction. The guide  156  is located outside the respective sliding portions  111  and  112  in the left-right direction and restricts outward displacement of the respective sliding portions  111  and  112  in the left-right direction. The side surfaces (inward facing side surfaces  146   b  and  147   b  of the long holes  140  and  141 ) of the guide  156  which face inward in the left-right direction face the above-described guide surface  121 . The guide  156  and the guide surface  121  may be in contact with each other. 
     [Operation] 
     Next, an operation of the above-described steering device  1  will be described. In the following description, a tilt operation, a telescopic operation, and a collapse stroke at the secondary collision will be mainly described. 
     &lt;Tilt Operation&gt; 
     As represented in  FIG.  1   , in the tilt operation, a driving force of the tilt motor  56  is transmitted to the housing body  22  via the link member  70  so that the housing body  22  pivots around the axis O 2 . Specifically, when the steering wheel  2  is adjusted upward, the tilt motor  56  is driven to rotate the tilt wire  61  and the tilt shaft  62  in a first direction (loosening direction of the tilt nut  71 ), for example. When the tilt shaft  62  rotates in the first direction, the tilt nut  71  moves rearward with respect to the tilt shaft  62 . Since the tilt nut  71  moves rearward, the housing body  22  pivots upward around the axis O 2  with respect to the tilt bracket  21 . As a result, the steering wheel  2  pivots upward around the axis O 2  together with the housing body  22 , the pipe  12 , and the steering shaft  13 . 
     When the steering wheel  2  is adjusted downward, the tilt shaft  62  is rotated in a second direction (tightening direction of the tilt nut  71 ). Then, the tilt nut  71  moves forward with respect to the tilt shaft  62 . Since the tilt nut  71  moves forward, the housing body  22  pivots downward around the axis O 2  with respect to the tilt bracket  21 . As a result, the steering wheel  2  pivots downward around the axis O 2  together with the housing body  22 , the pipe  12 , and the steering shaft  13 . 
     &lt;Telescopic Operation&gt; 
     During the telescopic operation, the driving force of the telescopic motor  86  is transmitted to the pipe  12  via the EA plate  102  and the EA block  101  so that the pipe  12  and the inner shaft  42  move forward and rearward with respect to the housing  11  and the outer shaft  43 . When the steering wheel  2  is moved rearward, the telescopic motor  86  is driven to rotate the telescopic coupling portion  82  in the first direction (loosening direction of the telescopic movable portion  83 ), for example. When the telescopic coupling portion  82  rotates in the first direction, the telescopic movable portion  83  and the EA plate  102  move rearward with respect to the telescopic coupling portion  82 . The driving force of the EA plate  102  is transmitted to the EA block  101 . In this case, the relative movement of the EA block  101  with respect to the EA plate  102  is restricted in a state where the respective sliding portions  111  and  112  are fitted into the respective rear enlarged portions  146 . Therefore, the driving force of the EA plate  102  is transmitted to the pipe  12  via the EA block  101 . As a result, the pipe  12  moves rearward together with the inner shaft  42  so that the steering wheel  2  moves rearward. 
     When the steering wheel  2  is moved forward, the telescopic coupling portion  82  is rotated in the second direction, for example. When the telescopic coupling portion  82  rotates in the second direction (tightening direction of the telescopic movable portion  83 ), the telescopic movable portion  83  and the EA plate  102  move forward with respect to the telescopic coupling portion  82 . As the EA plate  102  moves forward, the driving force of the EA plate  102  is transmitted to the pipe  12  via the EA block  101 . In this manner, the pipe  12  moves forward so that the steering wheel  2  moves forward. 
     &lt;At Time of Secondary Collision&gt; 
     Next, an operation at the secondary collision will be described. 
     As represented in  FIG.  6   , at the secondary collision (when a collision load is equal to or greater than a predetermined value), the steering wheel  2  moves forward with respect to the housing body  22  and the outer shaft  43  together with the pipe  12 , the EA block  101 , and the inner shaft  42 . 
       FIG.  7    is a view for describing the operation at the secondary collision. 
     As represented in  FIGS.  6  and  7   , at the secondary collision, a forward collision load acts on the pipe  12  via the steering wheel  2 . In this case, the collision load acts on the EA plate  102  via the EA block  101 . However, in the present embodiment, the female screw portion  83   a  of the telescopic movable portion  83  and the male screw portion  82   a  of the telescopic coupling portion  82  engage (are in contact) with each other in the front-rear direction. Accordingly, the forward movement of the EA plate  102  with respect to the housing  11  is restricted. Therefore, the steering shaft  13 , the pipe  12 , the hanger bracket  100 , and the EA block  101  try to move forward with respect to the EA plate  102  and the housing  11 . 
     In the present embodiment, the distance L 1  between the pressing portions  122   a  of the respective sliding portions  111  and  112  is narrower than a width L 2  of the wide portion  153 . Therefore, the EA block  101  moves forward with respect to the EA plate  102  while causing the respective sliding portions  111  and  112  to squeeze the extending portion  150 . The pressing portion  122   a  of the respective sliding portions  111  and  112  causes the deformable portion  155  to plastically deform (be crushed) inward in the left-right direction, when sliding on the outer surface (outward facing side surface  147   a  of the transition portion  147  (side surface facing the first side and side surface facing the second side)) of the wide portion  153  via the inclined surface  146   a . In this way, in a process in which the steering shaft  13  moves forward with respect to the EA plate  102  and the housing  11 , an impact load applied to a driver at the secondary collision is cushioned by a load generated when the respective sliding portions  111  and  112  squeeze the extending portion  150 . 
     The load generated between the EA block  101  and the EA plate  102  can be adjusted by changing a difference between the distance L 1  between the respective sliding portions  111  and  112  and the width L 2  of the wide portion  153 , or the thickness of the wide portion  153 . At the secondary collision, in addition to the load when the extending portion  150  is squeezed by the respective sliding portions  111  and  112 , for example, the impact load may be cushioned by the sliding resistance between the outer peripheral surface of the pipe  12  and the inner peripheral surface of the holding cylinder  31 . A paint having a high friction coefficient may be applied to the sliding portion between the outer peripheral surface of the pipe  12  and the inner peripheral surface of the holding cylinder  31 , or uneven processing may be applied thereto. 
     In this way, in the present embodiment, the telescopic mechanism  46  is configured as follows. The sliding portions  111  and  112  coupled to the pipe (the other member)  12  are disposed on both sides in the left-right direction with respect to the extending portion  150  coupled to the feed mechanism (one member). 
     According to this configuration, when the extending portion  150  tries to move or deform to a side separated from one sliding portion due to the load acting between the one sliding portion and the extending portion  150  (deformable portion  155 ), the movement or the deformation of the extending portion  150  can be restricted by the other sliding portion (restriction portion). In this manner, the extending portion  150  can efficiently plastically deform, and desired impact absorbing performance can be secured. In the present embodiment, in a case of “the movement or the deformation”, for example, the movement means that the extending portion  150  is displaced to a side separated from one sliding portion, or the sliding portions  111  and  112  are displaced to a side separated from the extending portion  150  without plastic deformation. For example, the deformation means that the extending portion  150  is bent to a side separated from one sliding portion, or the sliding portions  111  and  112  are bent to a side separated from the extending portion  150  without plastic deformation. The present embodiment may be configured in any way as long as at least one of the above-described movement and deformation can be restricted. 
     The present embodiment is configured as follows. In the telescopic mechanism  46 , the telescopic coupling portion (feed mechanism)  82  is screwed into the telescopic movable portion (feed mechanism)  83 . 
     According to this configuration, at the secondary collision, the male screw portion  82   a  of the telescopic coupling portion  82  and the female screw portion  83   a  of the telescopic movable portion  83  come into contact with each other. In this manner, the forward movement of the telescopic movable portion  83  with respect to the telescopic coupling portion  82  is restricted. In this manner, at the secondary collision, it is possible to prevent the EA plate  102  from moving forward together with the telescopic coupling portion  82 . Therefore, a load can be effectively generated between the extending portion  150  and the sliding portions  111  and  112 . As a result, desired impact absorbing performance can be secured. 
     In the present embodiment, the telescopic motor unit (actuator)  81  of the telescopic mechanism  46  is fixed to the housing  11  (housing body  22 ). Accordingly, the telescopic motor unit  81  does not move during the telescopic operation and at the secondary collision. Therefore, it is not necessary to secure a movement space of the telescopic motor unit  81  around the steering device  1 , and layout designing can be improved. 
     In particular, a feed screw mechanism is adopted as the telescopic mechanism  46 . Therefore, it is easy to secure an engagement force between the male screw (engaging portion)  82   a  of the telescopic coupling portion (shaft)  82  and the female screw (engaged portion)  83   a  of the telescopic movable portion (nut)  83 . It is easy to adjust a stroke of the pipe  12  with respect to a rotation amount of the telescopic motor unit  81  during the telescopic operation. 
     The present embodiment is configured as follows. Both the left and right side portions (deformable portion  155 ) of the extending portion  150  are caused to plastically deform by the respective sliding portions  111  and  112 . 
     According to this configuration, as the EA block  101  moves forward with respect to the EA plate  102 , the extending portions  150  plastically deform and is squeezed by the respective sliding portions  111  and  112 . In this manner, it is possible to improve the impact absorbing performance while the movement deformation of the extending portion  150  to a side separated from one sliding portion is restricted. 
     The present embodiment is configured so that the respective sliding portions  111  and  112  are formed line-symmetrically in a plan view. 
     According to this configuration, the load acting between the respective sliding portions  111  and  112  and the extending portion  150  is likely to be uniform. 
     In the present embodiment, the EA plate  102  is configured to include guides (first guide and second guide)  156  on a side opposite to the extending portion  150  with respect to the sliding portions  111  and  112 . 
     According to this configuration, the respective sliding portions  111  and  112  can smoothly move forward along the extending portion  150  during the collapse stroke generated due to the secondary collision. When the respective sliding portions  111  and  112  try to move or deform outward in the left-right direction due to the load acting between the extending portion  150  and the respective sliding portions  111  and  112 , the movement or the deformation of the respective sliding portions  111  and  112  can be restricted by the guide  156 . 
     The present embodiment is configured as follows. The EA plate  102  (extending portion  150 ) is connected to the telescopic mechanism  46  on a first side in the left-right direction and is supported by the housing body  22  via the support piece  135  on a second side in the left-right direction. 
     According to this configuration, the movement of the EA plate  102  in the left-right direction with respect to the housing  11  can be restricted. In this manner, it is possible to prevent the EA plate  102  itself from being displaced in the left-right direction due to the load generated between the respective sliding portions  111  and  112  and the extending portion  150  at the secondary collision. 
     Moreover, the present embodiment is configured as follows. In the telescopic mechanism  46 , the sliding portions  111  and  112  coupled to the pipe (the other member)  12  are disposed on both sides in the left-right direction with respect to the extending portion  150  coupled to the feed mechanism (one member). In addition, the present embodiment is configured as follows. The pressing portion (first contact portion and second contact portion)  122   a  which is a contact portion with the extending portion  150  of the respective sliding portions  111  and  112  forms the curved surface projecting toward the extending portion  150  in a plan view. 
     According to this configuration, when the sliding portions  111  and  112  slide on the extending portion  150  during the collapse stroke generated due to the secondary collision, it is possible to prevent the pressing portion  122   a  and the extending portion  150  from being caught on each other. In this manner, the sliding portions  111  and  112  can smoothly move on the extending portion  150 . In this manner, the impact load can be efficiently cushioned over the entire collapse stroke. Therefore, the impact absorbing performance can be improved. 
     The present embodiment is configured as follows. In the telescopic mechanism  46 , the telescopic coupling portion (feed mechanism)  82  is screwed into the telescopic movable portion (feed mechanism)  83 . 
     According to this configuration, at the secondary collision, the male screw portion  82   a  of the telescopic coupling portion  82  and the female screw portion  83   a  of the telescopic movable portion  83  come into contact with each other. In this manner, the forward movement of the telescopic movable portion  83  with respect to the telescopic coupling portion  82  is restricted. In this manner, at the secondary collision, it is possible to prevent the EA plate  102  from moving forward together with the telescopic coupling portion  82 . Therefore, a load can be effectively generated between the extending portion  150  and the sliding portions  111  and  112 . As a result, desired impact absorbing performance can be secured. 
     In the present embodiment, the telescopic motor unit (actuator)  81  of the telescopic mechanism  46  is fixed to the housing  11  (housing body  22 ). Accordingly, the telescopic motor unit  81  does not need to move during the telescopic operation and at the secondary collision. Therefore, it is not necessary to secure a movement space of the telescopic motor unit  81  around the steering device  1 , and layout designing can be improved. 
     In particular, the feed screw mechanism is adopted as the telescopic mechanism  46 . Therefore, it is easy to secure an engagement force between the male screw (engaging portion)  82   a  of the telescopic coupling portion (shaft)  82  and the female screw (engaging portion)  83   a  of the telescopic movable portion (nut)  83 . The feed screw mechanism is adopted as the telescopic mechanism  46 . Therefore, it is easy to adjust the stroke of the pipe  12  with respect to the rotation amount of the telescopic motor unit  81  during the telescopic operation. 
     The present embodiment is configured as follows. The extending portion  150  includes the rear constriction portion (narrow portion)  152  having the width narrower than the distance L 1  between the pressing portions  122   a  of the respective sliding portions  111  and  112 , and the wide portion  153  wider than the distance L 1  between the pressing portions  122   a.    
     According to this configuration, a portion of the wide portion  153  which bulges outward in the left-right direction with respect to the rear constriction portion  152  functions as the deformable portion  155  which is plastically deformable by the sliding portions  111  and  112  (pressing portions  122   a ) during the collapse stroke generated due to the secondary collision. In the present embodiment, it is possible to prevent the pressing portion  122   a  and the extending portion  150  from being caught on each other. Accordingly, it is easy to secure a tightening allowance (overlapping range in a front view) between the sliding portions  111  and  112  and the deformable portion  155 . Therefore, the deformable portion  155  can effectively plastically deform, and it is easy to secure desired impact absorbing performance. 
     The present embodiment is configured as follows. The outer peripheral surfaces of the sliding portions  111  and  112  extend to a side separated from the extending portion  150  as the outer peripheral surface is directed toward both sides in the front-rear direction with respect to the pressing portion  122   a.    
     According to this configuration, it is possible to prevent the portion of the sliding portions  111  and  112  other than the pressing portion  122   a  from coming into contact with the extending portion  150  during the collapse stroke. In this manner, the contact position of the sliding portions  111  and  112  with the extending portion  150  can be stabilized, and it is easy to secure the desired impact absorbing performance. 
     In the present embodiment, the EA plate  102  is configured to include guides (first guide and second guide)  156  on a side opposite to the extending portion  150  with respect to the sliding portions  111  and  112 . 
     According to this configuration, the respective sliding portions  111  and  112  can smoothly move forward along the extending portion  150  during the collapse stroke generated due to the secondary collision. In addition, when the sliding portions  111  and  112  try to move or deform outward in the left-right direction due to the load acting between the extending portion  150  and the respective sliding portions  111  and  112 , the movement or the deformation of the respective sliding portions  111  and  112  can be restricted by the guide  156 . In the present embodiment, in a case of “the movement or the deformation”, for example, the movement means that the extending portion  150  is displaced to a side separated from one sliding portion, or the sliding portions  111  and  112  are displaced to a side separated from the extending portion  150  without plastic deformation. For example, the deformation means that the extending portion  150  is bent to a side separated from one sliding portion, or the sliding portions  111  and  112  are bent to a side separated from the extending portion  150  without plastic deformation. The present embodiment may be configured in any way as long as at least one of the above-described movement and deformation can be restricted. 
     The present embodiment is configured so that the facing surface facing the guide  156  in the sliding portions  111  and  112  has the guide surface  121  extending along the front-rear direction. 
     According to this configuration, the sliding portions  111  and  112  are smoothly guided along an inward facing end surface of the guide  156  during the collapse stroke generated due to the secondary collision. 
     Modification Example 
     In the above-described embodiment, a case has been described where the respective sliding portions  111  and  112  are formed in an oval shape. However, the present disclosure is not limited to this configuration. For example, the sliding portions  111  and  112  may have a perfect circular shape in a plan view as represented in  FIG.  8   , or may have an oval shape in which the left-right direction is set as the longitudinal direction as represented in  FIG.  9   . As represented in  FIG.  10   , the sliding portions  111  and  112  may have a triangular shape in which one apex faces inward in the left-right direction or may have a polygonal shape (rectangular shape) other than the triangular shape. When the sliding portions  111  and  112  are formed in the polygonal shape, a position in the front-rear direction of the apex facing inward in the left-right direction can be appropriately changed. 
     Furthermore, as represented in  FIG.  11   , the sliding portions  111  and  112  may be configured to have a rectangular portion  161  having a rectangular shape in a plan view, and a bulging portion  162  bulging inward in the left-right direction from the rectangular portion  161 . A surface of the rectangular portion  161  which faces outward in the left-right direction forms a guide surface  121  linearly extending in the front-rear direction. On the other hand, the bulging portion  162  is formed in a semicircular shape projecting inward in the left-right direction. The bulging portion  162  may have a triangular shape. 
     In the above-described embodiment, a configuration has been described in which the guide surface  121  is formed into the flat surface linearly extending in the front-rear direction. However, the present disclosure is not limited to this configuration. As represented in  FIG.  12   , the guide surfaces  121  may be formed at an interval in the front-rear direction. In the represented example, the guide surface  121  is formed in a semicircular shape bulging outward in the left-right direction. 
     In the above-described embodiment, a configuration has been described in which the respective sliding portions  111  and  112  have cross-sectional areas perpendicular to the up-down direction which are uniform over the entire region in the up-down direction. However, the present disclosure is not limited to this configuration. For example, as represented in  FIG.  13   , the cross-sectional areas of the respective sliding portions  111  and  112  may be formed to be different in the up-down direction. In the represented example, the respective sliding portions  111  and  112  are formed in a truncated cone shape whose cross-sectional area decreases downward. 
     According to this configuration, in the respective sliding portions  111  and  112 , a contact position with the extending portion  150  is changed in the up-down direction so that the tightening allowance between the respective sliding portions  111  and  112  and the extending portion  150  can be adjusted. The contact position may be adjusted by changing the thickness of the hanger bracket  100  or the fixing plate  110 , or by separately using a spacer. In the example represented in  FIG.  13   , a configuration has been described in which the cross-sectional areas of the respective sliding portions  111  and  112  gradually decrease downward. However, the present disclosure is not limited to this configuration. The cross-sectional areas of central portions of the respective sliding portions  111  and  112  in the up-down direction may be smaller than the cross-sectional areas of both upper and lower end portions. 
     In the above-described embodiment, a configuration has been described in which the respective sliding portions  111  and  112  are formed line-symmetrically. However, the present disclosure is not limited to this configuration. For example, as represented in  FIG.  14   , the sliding portions  111  and  112  may be formed asymmetrically in the left-right direction. 
     In the above-described embodiment, a configuration has been described in which the respective sliding portions  111  and  112  have each one pressing portion  122   a.  However, the present disclosure is not limited to this configuration. For example, as represented in  FIG.  15   , the respective sliding portions  111  and  112  may have a plurality of pressing portions  200  and  201 . The respective pressing portions  200  and  201  are formed in a triangular shape in which one apex faces inward in the left-right direction. Top surfaces  200   a  and  201   a  of the respective pressing portions  200  and  201  are formed on curved surfaces projecting inward in the left-right direction in a plan view. 
     The respective pressing portions  200  and  201  are connected in the front-rear direction. Surfaces (hereinafter, referred to as guide surfaces  210 ) of the respective pressing portions  200  and  201  which face outward in the left-right direction are flush with each other. On the other hand, the top surface  200   a  of the front pressing portion  200  is located outside the top surface  201   a  of the rear pressing portion  201  in the left-right direction. Therefore, in the respective sliding portions  111  and  112 , when a distance in the left-right direction between the top surfaces  200   a  of the respective front pressing portions  200  is defined as L 1   a  and a distance between the top surfaces  201   a  of the respective rear pressing portions  201  is defined as L 1   b , the distances are set to L 1   a &gt;L 1   b . A portion located between the respective pressing portions  200  and  201  on a surface facing inward in the left-right direction in the first sliding portion  111  has a relief portion  211  formed by slopes of the respective pressing portions  200  and  201 . The relief portion  211  is recessed outward in the left-right direction with respect to the top surfaces  200   a  and  201   a.    
     As in the sliding portions  111  and  112  represented in  FIG.  16   , the respective pressing portions  200  and  201  may be separated from each other in the front-rear direction. In the represented example, the respective pressing portions  200  and  201  are formed in a perfect circle shape having different outer diameters in a plan view. 
     Second Embodiment 
       FIG.  17    is an enlarged bottom view of the steering device  1  according to a second embodiment.  FIG.  18    is a view representing the steering device  1  according to the second embodiment and is a sectional view corresponding to  FIG.  3   . 
     In the steering device  1  represented in  FIGS.  17  and  18   , the load absorbing mechanism  15  includes an EA cover (restriction member)  300 . The EA cover  300  restricts downward movement of the EA plate  102  with respect to the housing body  22  (sliding portions  111  and  112 ). The EA cover  300  is disposed on a side opposite to the telescopic mechanism  46  side with respect to the axis O 1  in a lower portion of the housing body  22 . The EA cover  300  covers a portion of the EA plate  102  from below. 
     The EA cover  300  includes a restriction plate  301  and a sliding plate  302 . 
     The restriction plate  301  is formed of a material (for example, a metal material) having higher rigidity than that of the sliding plate  302 . The restriction plate  301  extends in the front-rear direction while the up-down direction is used as the thickness direction. The restriction plate  301  includes an overlapping piece  301   a  and an attachment piece  301   b.    
     The overlapping piece  301   a  extends in the front-rear direction below the second protruding wall  39 . The overlapping piece  301   a  overlaps a left end portion (end portion on a side opposite to the telescopic mechanism  46 ) of the operating piece  134  from below. In the represented example, the overlapping piece  301   a  overlaps the guide  156  on the left side with respect to the extending portion  150 . The length of the overlapping piece  301   a  in the front-rear direction is longer than that of the EA plate  102  (operating piece  134 ). 
     The attachment piece  301   b  projects outward or forward in the left-right direction from the overlapping piece  301   a . The attachment piece  301   b  is fixed to the housing body  22  in a portion deviating from an operation locus of the EA plate  102  during the telescopic operation. The attachment piece  301   b  is fixed to the housing body  22  by a bolt  305 , for example. 
     The sliding plate  302  overlaps an upper surface of the overlapping piece  301   a . The sliding plate  302  is formed of a material (for example, a resin material) in which frictional resistance generated with the operating piece  134  is smaller than frictional resistance acting between the operating piece  134  and the restriction plate  301 . The sliding plate  302  is fixed to the overlapping piece  301   a . As a method of fixing the sliding plate  302 , a pin may be press-fitted into the overlapping piece  301   a . A pin having a hook claw may be locked and fixed to the overlapping piece  301   a  or may be fixed by adhesion. 
     As represented in  FIG.  18   , the sliding plate  302  is located between the overlapping piece  301   a  and the operating piece  134 . An upper surface of the sliding plate  302  is close to or in contact with a lower surface of the operating piece  134 . The EA cover  300  may be configured not to include the sliding plate  302 . 
     In the steering device  1  of the present embodiment, when the pipe  12  moves in the front-rear direction together with the inner shaft  42  during the telescopic operation, the EA plate  102  moves in the front-rear direction with respect to the EA cover  300 . The sliding plate  302  may be in contact with the operating piece  134 . In this case, a lower surface of the operating piece  134  slides on the sliding plate  302  during the telescopic operation. 
     According to this configuration, at the secondary collision, when the load acting between the sliding portions  111  and  112  and the extending portion  150  increases, the EA plate  102  is pressed downward by the respective sliding portions  111  and  112 . Then, in the EA plate  102 , the first sliding portion  111  tries to be separated from the first long hole  140 , and the second sliding portion  112  tries to be separated from the second long hole  141 . In this case, the operating piece  134  comes into contact with the EA cover  300  via the sliding plate  302 . In this manner, the downward movement of the EA plate  102  with respect to the housing body  22  (sliding portions  111  and  112 ) is restricted. As a result, the sliding portions  111  and  112  can be prevented from being separated from the EA plate  102 , and absorbed energy absorbed by the load absorbing mechanism  15  can be stabilized over an entire region of the collapse stroke. 
     In the steering device  1  of the present embodiment, the resin sliding plate  302  is disposed between the metal restriction plate  301  and the operating piece  134 . In this manner, abnormal noise or wear occurring due to contact between the metal materials during telescopic operation can be prevented. 
     Hitherto, the preferred embodiments according to the present disclosure have been described. However, the present disclosure is not limited to the embodiments. Additions, omissions, substitutions, and other modifications of the configurations can be made within the scope not departing from the concept of the present disclosure. The present disclosure is not limited by the above-described configurations and is limited only by the appended claims. 
     For example, in the above-described embodiment, a configuration has been described in which the axis O 1  intersects the front-rear direction. However, the present disclosure is not limited to the configuration. The axis O 1  may coincide with the front-rear direction of the vehicle. 
     In the above-described embodiment, a case has been described where the telescopic mechanism  46  is the feed screw mechanism. However, the present disclosure is not limited to the configuration. For example, the telescopic mechanism  46  may adopt a gear. 
     In the above-described embodiment, a configuration has been described in which the extending portion  150  is plastically deformed by the two sliding portions  111  and  112 . However, the present disclosure is not limited to this configuration. For example, the sliding portion may be disposed on the first side of the left-right direction with respect to the extending portion  150 , and a restriction portion that restricts the movement or the deformation of the extending portion  150  may be disposed on the second side in the left-right direction with respect to the extending portion  150 . That is, the restriction portion may be configured to be separated from the extending portion  150  as long as the extending portion  150  does not move or deform. In this case, the extending portion  150  may have the deformable portion  155  formed only on a side surface facing the first side in the left-right direction. 
     In the above-described embodiment, a case has been described where the portion located between the long holes  140  and  141  serves the extending portion  150  and the portion located outside the long holes  140  and  141  in the left-right direction serves as the guide  156 . However, the present disclosure is not limited to this configuration. The EA plate  102  may be configured without the long holes  140  and  141  or the guide  156  as long as the EA plate  102  has at least the extending portion  150 . 
     In the above-described embodiment, a configuration has been described in which the EA plate  102  bridges the telescopic mechanism  46  (telescopic movable portion  83 ) and the housing body  22  (protruding wall  39 ). However, the present disclosure is not limited to this configuration. The EA plate  102  may be cantilevered and supported by the telescopic mechanism  46 . 
     In the above-described embodiment, a configuration has been described in which the extending portion  150  is disposed in one row. However, the present disclosure is not limited to this configuration. For example, a plurality of the extending portions  150  may be provided in the left-right direction or in the up-down direction. The sliding portion and the restriction portion can be provided depending on the number of the extending portions  150 . 
     In the above-described embodiment, a case has been described where the EA block  101  (sliding portions  111  and  112 ) is provided on the pipe  12  side, and the EA plate  102  (extending portion  150 ) is provided on the housing body  22  side. However, the present disclosure is not limited to this configuration. For example, the EA plate  102  may be provided on the pipe  12  side, and the EA block  101  may be provided on the housing body  22  side. 
     In the above-described embodiment, a configuration has been described in which the sliding portions  111  and  112  are integrally formed in the fixing plate  110 . However, the present disclosure is not limited to this configuration. For example, the sliding portion may be formed in a bolt shape and may be fastened to the fixing plate  110  from the opposite side (lower side) across the EA plate  102  with respect to the fixing plate  110 . As represented in  FIG.  19   , the bolt  350  includes a shaft portion  350   a  and a head portion  350   b . The shaft portion  350   a  is fixed to the fixing plate  110  through the first long hole  140  (or the second long hole  141 ). In the shaft portion  350   a , a portion located inside the first long hole  140  (or the second long hole  141 ) functions as the first sliding portion  111  (or the second sliding portion  112 ) that slides on the extending portion  150 . A cross-sectional shape of the portion of the shaft portion  350   a  which slides on the extending portion  150  can be appropriately changed. 
     The head portion  350   b  is enlarged with respect to the shaft portion  350   a . In the head portion  350   b , a portion of the outer peripheral portion overlaps the EA plate  102  (extending portion  150  or guide  156 ) from below. The head portion  350   b  functions as a restriction member that restricts the movement of the EA plate  102  (extending portion  150 ) in the up-down direction with respect to the sliding portions  111  and  112 . In the example in  FIG.  19   , a gap S is provided between the head portion  350   b  and the EA plate  102 . Therefore, it is possible to prevent a deformation mark (burr) generated by the shaft portion  350   a  squeezing the extending portion  150  from coming into contact with the head portion  350   b . In this manner, it is possible to prevent the collapse stroke from being hindered by the deformation mark. 
     The restriction member may have a configuration in which the movement of the extending portion  150  in the up-down direction with respect to the sliding portions  111  and  112  is restricted. That is, the restriction member may be configured so that the movement of the extending portion  150  in the up-down direction is indirectly restricted by the EA cover  300  in contact with a portion other than the extending portion  150  as in the second embodiment. The restriction member may be configured so that the movement of the extending portion  150  in the up-down direction is directly restricted by directly coming into contact with the extending portion  150  as in the head portion  350   b  according to the modification example. 
     The restriction member may be provided in the housing body  22  or may be provided in the pipe  12 . 
     In the above-described embodiment, a configuration has been described in which only the EA plate  102  plastically deforms. However, a configuration may be adopted so that at least one of the EA plate  102  and the EA block  101  plastically deforms in a process in which the sliding portions  111  and  112  slide on the extending portion  150 . 
     Alternatively, the components in the above-described embodiment can be appropriately replaced with well-known components within the scope not departing from the concept of the present disclosure, and the above-described modification examples may be appropriately combined with each other. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1 : Steering device 
               2 : Steering wheel 
               11 : Housing 
               12 : Pipe (other member, one member) 
               13 : Steering shaft 
               15 : Load absorbing mechanism 
               46 : Telescopic mechanism 
               81 : Telescopic motor unit (actuator) 
               82 : Telescopic coupling portion (feed mechanism, shaft) 
               83 : Telescopic movable portion (one member, other member, feed mechanism, nut) 
               111 : First sliding portion (sliding portion, restriction portion) 
               112 : Second sliding portion (restriction portion, sliding portion) 
               121 : Guide surface (facing surface) 
               122   a : Pressing portion (first contact portion, second contact portion) 
               150 : Extending portion 
               156 : Guide (first guide and second guide) 
               200   a ,  201   a : Top surface (first contact portion, second contact portion) 
               210 : Guide surface (facing surface) 
               300 : EA cover (restriction member) 
               350   b : Head portion (restriction member)