JP7279618B2 - steering device - Google Patents

Description

The present invention relates to steering devices.

A vehicle is provided with a steering device as a device for transmitting an operation of an operator (driver) to the steering wheel to the wheels. A steering device may include an adjustment mechanism for adjusting the position of the steering wheel. For example, Patent Literature 1 describes an example of a steering device capable of adjusting the vertical position of a steering wheel. As described in Patent Document 1, a steering column is attached to a vehicle body via a shaft. As the steering column rotates about the axis, the vertical position of the steering wheel changes. Further, in the steering device of Patent Document 1, a member (front portion) in which a shaft as a pivot is arranged is integrally formed with a member (rear portion) that supports and adjusts the support that tightens the steering column from behind. This increases the stiffness of the adjustment support.

JP 2011-235886 A

By the way, when a vehicle collides, a secondary collision occurs in which the operator collides with the steering wheel. Therefore, the steering system is provided with an energy absorbing device for reducing the impact applied to the operator in the event of a secondary collision. However, in the case of the steering device of Patent Literature 1, when energy that cannot be absorbed by the energy absorbing device is input to the steering device, the member (front portion) where the shaft as the pivot is arranged deforms. In this case, the steering wheel may drop together with the steering column, making it impossible to operate the steering wheel.

The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a steering device that can prevent the steering wheel from falling.

In order to achieve the above object, a steering device according to an aspect of the present disclosure includes a first fixed portion fixed to a steering support member provided in a vehicle, a front portion of the first fixed portion and a A top plate including a second fixing portion fixed to a support member and a connecting portion connecting the first fixing portion and the second fixing portion; a second bracket attached to the second fixed part so as to be rotatable with respect to the second fixed part; and a steering shaft supported by the first bracket and connected to a steering wheel. and a lower column fixed to the second bracket and connected to the upper column, wherein the connecting portion is a first hole which is an elongated hole extending along the axial direction of the upper column wherein the first bracket includes a guide pin passing through the first hole, and the second fixing portion includes an upper wall facing the steering support member and two side walls connected to the second bracket. a rear wall connected to the connecting portion; and an inclined wall arranged at a corner surrounded by the upper wall, the side walls and the rear wall and inclined with respect to the upper wall, the side walls and the rear wall. and wherein said top wall comprises a recess provided in a surface located between two said sloping walls and facing said steering support member.

In the event of a vehicle collision, a secondary collision occurs in which the operator hits the steering wheel. When a load equal to or greater than a predetermined load acts on the steering wheel, the first bracket separates from the first fixing portion. After that, the first bracket moves along the axial direction of the upper column as the guide pin is guided by the first hole. The upper column 51 moves together with the first bracket. Impact is absorbed by friction between the upper column and the lower column. However, when energy exceeding the energy that can be absorbed by the friction between the upper column and the lower column acts on the steering device, the load acting on the first bracket is transmitted to the second fixed portion via the guide pin. In the steering device of the present disclosure, the second fixed part has a top wall, a side wall, a rear wall and an inclined wall, and the top wall has a recess. Therefore, the rigidity of the second fixing portion is increased. Even when a large load acts on the second fixing portion, the second fixing portion is less likely to deform. Therefore, the steering device of the present disclosure can prevent the steering wheel from falling.

As a desirable aspect of the above steering device, the second fixing portion includes a rib that protrudes from the rear wall and is connected to the connecting portion. As a result, the rib stretches between the rear wall and the connecting portion, so that the second fixing portion is less likely to bend with respect to the connecting portion. The steering device of the present disclosure can further suppress deformation of the second fixing portion when a load acts on the second fixing portion.

As a desirable aspect of the above steering device, the connecting portion includes a first hole into which a portion of the steering support member is inserted. Thereby, the steering device of the present disclosure can suppress interference between the steering support member and the top plate even when the steering support member is arranged near the top plate.

As a desirable aspect of the above steering device, the first holes are arranged on both sides of the second hole. Thereby, the two guide pins are each guided to the first holes. The first bracket moves straighter along the axial direction of the upper column. Therefore, the energy that can actually be absorbed by the friction between the upper column and the lower column is less likely to deviate from the designed value. The steering device of the present disclosure can absorb predetermined energy through friction between the upper column and the lower column, and can suppress deformation of the second fixing portion.

The steering device of the present disclosure can prevent the steering wheel from falling.

FIG. 1 is a perspective view of a steering device according to this embodiment. FIG. 2 is a perspective view of the steering device according to this embodiment. FIG. 3 is a perspective view of the steering device according to this embodiment. FIG. 4 is a plan view of the steering device according to this embodiment. FIG. 5 is a sectional view taken along the line AA in FIG. 4. FIG. 6 is a cross-sectional view taken along the line BB in FIG. 4. FIG. FIG. 7 is a cross-sectional view taken along line CC in FIG. FIG. 8 is a perspective view of a steering support member, a top plate, and a first bracket; FIG. 9 is a perspective view of the steering support member, top plate, and first bracket. FIG. 10 is a side view of the steering support member, top plate, and first bracket. FIG. 11 is an exploded perspective view of the steering support member, top plate, and first bracket. FIG. 12 is an exploded perspective view of the steering support member, top plate, and first bracket. FIG. 13 is a perspective view of the second fixing portion of the top plate. FIG. 14 is a perspective view of the second fixing portion of the top plate. FIG. 15 is a perspective view of the second fixing portion of the top plate. FIG. 16 is a plan view of the second fixing portion of the top plate. FIG. 17 is a bottom view of the second fixing portion of the top plate. 18 is a cross-sectional view taken along line DD in FIG. 16. FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited by the following modes for carrying out the invention (hereinafter referred to as embodiments). In addition, components in the following embodiments include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those that fall within a so-called equivalent range. Furthermore, the constituent elements disclosed in the following embodiments can be combined as appropriate.

FIG. 1 is a perspective view of a steering device according to this embodiment. FIG. 2 is a perspective view of the steering device according to this embodiment. FIG. 3 is a perspective view of the steering device according to this embodiment. FIG. 4 is a plan view of the steering device according to this embodiment. FIG. 5 is a sectional view taken along the line AA in FIG. 4. FIG. 6 is a cross-sectional view taken along the line BB in FIG. 4. FIG. FIG. 7 is a cross-sectional view taken along line CC in FIG. 8 and 9 are perspective views of the steering support member, top plate, and first bracket. FIG. 10 is a side view of the steering support member, top plate, and first bracket. 11 and 12 are exploded perspective views of the steering support member, top plate, and first bracket. 13 to 15 are perspective views of the second fixing portion of the top plate. FIG. 16 is a plan view of the second fixing portion of the top plate. FIG. 17 is a bottom view of the second fixing portion of the top plate. 18 is a cross-sectional view taken along line DD in FIG. 16. FIG.

(embodiment)
As shown in FIG. 1 , steering device 100 includes steering wheel 101 , steering shaft 20 , universal joint 103 , intermediate shaft 105 and universal joint 107 . Steering device 100 is joined to pinion shaft 109 .

As shown in FIG. 1 , the steering shaft 20 has an input shaft 21 and an output shaft 22 . The input shaft 21 and the output shaft 22 are supported by the steering column 50 . One end of the input shaft 21 is connected to the steering wheel 101 . The other end of the input shaft 21 is connected to the output shaft 22 . The input shaft 21 is coupled to transmit torque to the output shaft 22 and to move axially relative to the output shaft 22 . The output shaft 22 is connected to the universal joint 103 . One end of the intermediate shaft 105 is connected to the universal joint 103 . The other end of intermediate shaft 105 is connected to universal joint 107 . Universal joint 107 is connected to pinion shaft 109 .

In the following description, an XYZ Cartesian coordinate system is used. The X-axis is parallel to the vehicle width direction of the vehicle on which the steering device 100 is mounted. The Z-axis is parallel to the longitudinal direction of the steering shaft 20 (parallel to the rotation axis Z). The Y-axis is perpendicular to both the X-axis and the Z-axis. A direction along the X axis is referred to as the X direction, a direction along the Y axis is referred to as the Y direction, and a direction along the Z axis is referred to as the Z direction. The direction toward the front of the vehicle in the Z direction is the +Z direction. The right direction when the operator faces +Z direction is defined as +X direction. The upward direction in the Y direction is the +Y direction.

As shown in FIG. 2 , the steering device 100 includes a steering column 50 , a top plate 10 , a first bracket 40 , a second bracket 80 and a tightening mechanism 30 .

The steering column 50 is a member that supports the steering shaft 20 . The input shaft 21 and the output shaft 22 of the steering shaft 20 are rotatable around the rotation axis Z. As shown in FIG. The rotation axis Z is a straight line passing through the center of gravity of each cross section when the input shaft 21 is cut by a plane orthogonal to the longitudinal direction of the input shaft 21 .

The steering column 50 has an upper column 51 and a lower column 54 . The upper column 51 is a substantially cylindrical member. Upper column 51 is arranged behind lower column 54 . The upper column 51 supports the input shaft 21 via bearings. The lower column 54 is a substantially cylindrical member. A portion of the lower column 54 is fitted inside the upper column 51 . A portion of lower column 54 contacts the inner wall of upper column 51 . Friction is generated between the upper column 51 and the lower column 54 . In normal use, friction between upper column 51 and lower column 54 restricts relative movement between upper column 51 and lower column 54 . On the other hand, when a large load acts on the upper column 51 (at the time of a secondary collision, etc.), the upper column 51 and the lower column 54 move relatively while resisting friction.

As shown in FIG. 7 , the upper column 51 includes a body portion 511 , slits 513 , projecting portions 514 and projecting portions 515 . The body portion 511 is a cylindrical member that covers the steering shaft 20 . The slit 513 is a notch provided in a part of the body portion 511 . The slit 513 extends along the Z direction. The −Z direction end of the slit 513 is open. The projecting portion 514 and the projecting portion 515 extend from the body portion 511 in the −Z direction. The projecting portion 514 is arranged in the +X direction with respect to the slit 513 . The projecting portion 514 has an elongated hole 5141 extending along the Z direction. The projecting portion 515 is arranged in the −X direction with respect to the slit 513 . The protruding portion 515 has an elongated hole 5151 extending along the Z direction.

The top plate 10 is a member for supporting the steering column 50 . As shown in FIG. 1 , the top plate 10 is arranged in the +Y direction of the steering column 50 . The top plate 10 is fixed to a steering support member 200 (see FIGS. 8 to 10) provided on the vehicle. As shown in FIG. 8 , the top plate 10 includes a first fixing portion 11 , a second fixing portion 12 and a connecting portion 15 . The first fixing portion 11, the second fixing portion 12, and the connecting portion 15 are integrally molded.

The 1st fixing|fixed part 11 is a plate-shaped member. The first fixing portion 11 is arranged so as to overlap the upper column 51 when viewed in the Y direction. The first fixing portion 11 is fixed to the steering support member 200 with bolts.

The second fixing portion 12 is a box-shaped member. For example, the second fixing portion 12 is formed by deep drawing. The second fixing part 12 is arranged in front of the first fixing part 11 . The second fixing portion 12 is arranged so as to overlap the lower column 54 when viewed in the Y direction. The width of the second fixing portion 12 in the X direction is smaller than the width of the first fixing portion 11 in the X direction. The second fixing portion 12 is fixed to the steering support member 200 with bolts. As shown in FIG. 13 , the second fixing portion 12 includes a top wall 121 , two side walls 123 , a rear wall 125 , two inclined walls 127 and two ribs 129 .

The upper wall 121 is a plate-like member facing the steering support member 200 . As shown in FIG. 13, the top wall 121 has two slits 1211 and a recess 1212 . The slit 1211 is an elongated hole extending in the Z direction. The end of the slit 1211 in the +Z direction is open. The two slits 1211 are spaced apart in the X direction. A bolt is inserted into the slit 1211 . A bolt inserted into the slit 1211 connects the second fixing portion 12 to the steering support member 200 . Recess 1212 is a depression provided on the surface facing steering support member 200 . A recess 1212 is arranged between the two slits 1211 . As shown in FIG. 16, the recess 1212 has a triangular shape when viewed in the Y direction. The width of the concave portion 1212 in the X direction decreases toward the +Z direction.

As shown in FIG. 14 , the side wall 123 is a plate-like member perpendicular to the top wall 121 . The thickness direction of the sidewall 123 is parallel to the X direction. The side walls 123 are arranged on both sides of the upper wall 121 in the X direction. The side walls 123 extend from both ends of the upper wall 121 in the X direction in a direction approaching the lower column 54 . The side wall 123 is arranged outside the slit 1211 in the X direction. Side wall 123 includes hole 1231 . A pivot shaft 81 (see FIG. 2) is inserted into the hole 1231 .

As shown in FIG. 13 , the rear wall 125 is a plate-like member orthogonal to the upper wall 121 and side walls 123 . The rear wall 125 extends from the −Z direction end of the upper wall 121 in a direction approaching the lower column 54 . The rear wall 125 is connected with the connecting portion 15 .

As shown in FIG. 13, the angled wall 127 is located at a corner bounded by the top wall 121 , side walls 123 and rear wall 125 . The inclined wall 127 is a plate-like member that is inclined with respect to the upper wall 121 , the side walls 123 and the rear wall 125 . When viewed from the thickness direction of the inclined wall 127, the inclined wall 127 has a triangular shape. The sides of the triangle drawn by the inclined wall 127 correspond to the edges of the top wall 121, the side walls 123 and the rear wall 125, respectively. A recess 1212 in the top wall 121 is arranged between the two slanted walls 127 . That is, as shown in FIG. 16, the inclined wall 127 on one side, the recessed portion 1212, and the recessed portion 1212 on the other side are arranged in this order toward the +X direction.

As shown in FIG. 13, ribs 129 protrude from rear wall 125 in the −Z direction. The rib 129 is connected to the connecting portion 15 . The two ribs 129 are spaced apart in the X direction. As shown in FIG. 16, rib 129 is positioned between recess 1212 and sloping wall 127 in the X direction. The rib 129 is arranged closer to the recess 1212 than a straight line passing through the −Z direction end of the slit 1211 and the +Z direction end of the first hole 153 of the connecting portion 15 . The rib 129 has a triangular shape when viewed in the Y direction. The width of the rib 129 in the X direction decreases toward the -Z direction.

The connecting portion 15 is a plate-like member. The connecting portion 15 connects the first fixing portion 11 and the second fixing portion 12 . The width of the connecting portion 15 in the X direction is approximately equal to the width in the X direction of the first fixing portion 11 and larger than the width in the X direction of the second fixing portion 12 . The connecting portion 15 has two first holes 153 and a second hole 151 . The first hole 153 is an elongated hole along the Z direction. That is, the first hole 153 is an elongated hole extending from the first fixing portion 11 toward the second fixing portion 12 . It can also be said that the first hole 153 is an elongated hole extending along the axial direction of the upper column 51 (lower column 54). The first holes 153 are arranged on both sides of the second holes 151 . The second hole 151 is arranged in the center of the connecting portion 15 . A second hole 151 is arranged between two first holes 153 . The second hole 151 is a hole for avoiding interference between the steering support member 200 and the top plate 10 . A portion of the steering support member 200 is inserted into the second hole 151 as shown in FIG. As shown in FIG. 10, a portion of the steering support member 200 is arranged in the -Y direction from the connecting portion 15. As shown in FIG.

The first bracket 40 and the second bracket 80 are members for supporting the steering column 50 . The first bracket 40 is also called a tilt bracket. The second bracket 80 is also called a pivot bracket. The second bracket 80 is arranged in the +Z direction with respect to the first bracket 40 . The first bracket 40 is attached to the first fixed portion 11 with bolts. A bolt that connects the first bracket 40 and the first fixing portion 11 is a bolt that connects the first fixing portion 11 and the steering support member 200 . A second bracket 80 is fixed to the outer peripheral surface of the lower column 54 . The second bracket 80 is attached to the second fixed part 12 so as to be rotatable relative to the second fixed part 12 . As shown in FIG. 2, the second bracket 80 has a pivot shaft 81 whose axial direction is along the X direction. A pivot shaft 81 is connected to the second fixed part 12 . Pivot shaft 81 is mounted in hole 1231 shown in FIG. The steering column 50 can rotate around the pivot shaft 81 .

As shown in FIGS. 6 and 7, the first bracket 40 includes a mounting plate 41, a detachable capsule 49, guide pins 47, a first support plate 44, and a second support plate 45. As shown in FIGS. The mounting plate 41 is arranged in the +Y direction of the steering column 50 . The detachable capsule 49 is attached to the first fixed portion 11 by bolts. A bolt that connects the detachable capsule 49 and the first fixed portion 11 is a bolt that connects the first fixed portion 11 and the steering support member 200 . That is, one bolt connects the detachable capsule 49 and the first fixing portion 11 to the steering support member 200 . The detachable capsule 49 is made of a lightweight alloy such as an aluminum alloy for die casting (ADC material (Aluminum alloy Die Casting)). The mounting plate 41 is connected to the detachable capsule 49 by a resin member 48 formed by resin injection, for example. At the time of a secondary collision or the like, a +Z-direction load acts on the steering column 50 , thereby moving the mounting plate 41 with respect to the detachable capsule 49 and cutting the resin member 48 . As a result, the first bracket 40 excluding the detachable capsule 49 and the upper column 51 are detached from the steering support member 200 . Thus, the first bracket 40 is attached to the first fixing portion 11 so as to be detachable from the first fixing portion 11 when a predetermined load is applied. After the first bracket 40 is separated from the first fixing portion 11, the impact is absorbed by the friction between the upper column 51 and the lower column 54.

As shown in FIG. 6, the guide pin 47 is attached to the mounting plate 41 . The guide pin 47 passes through the first hole 153 of the connecting portion 15 . The guide pin 47 is guided by the inner wall of the first hole 153 . This makes it easier for the upper column 51 to move straight along the Z direction after the first bracket 40 is separated from the first fixing portion 11 . If the energy cannot be completely absorbed by the friction between the upper column 51 and the lower column 54, the guide pin 47 reaches the end of the first hole 153 in the +Z direction. In this case, the load acting on the first bracket 40 is transmitted to the connecting portion 15 and the second fixing portion 12 via the guide pin 47 .

As shown in FIG. 7, the first support plate 44 and the second support plate 45 are plate-shaped members extending from the mounting plate 41 in the -Y direction. The first support plate 44 and the second support plate 45 are arranged with a gap in the X direction. The first support plate 44 and the second support plate 45 sandwich the steering column 50 . That is, the steering column 50 is arranged between the first support plate 44 and the second support plate 45 . The first support plate 44 has a slot 441 . The second support plate 45 has a slot 451 . The elongated holes 441 and 451 extend along an arc around the pivot shaft 81 shown in FIG. 2 (see FIG. 6).

The tightening mechanism 30 is a device for switching between a state in which the position of the steering column 50 can be adjusted and a state in which the position of the steering column 50 is fixed. As shown in FIG. 7, the tightening mechanism 30 includes a tightening shaft 35, a plurality of friction plates 36, a fixed cam 31, a movable cam 32, a nut 34, a thrust bearing 33, an operating lever 39, A case 37 and a coil spring 38 are provided.

As shown in FIG. 7 , the tightening shaft 35 has a shaft portion 350 , a head portion 351 and a male screw 352 . The shaft portion 350 is a cylindrical member. The shaft portion 350 passes through the long hole 441 , the long hole 5141 , the long hole 5151 and the long hole 451 . The head 351 is arranged at the end of the shaft 350 in the +X direction. The male screw 352 is arranged at the end of the shaft portion 350 in the -X direction. A plurality of friction plates 36 are arranged between the head 351 and the first support plate 44 . The shaft portion 350 passes through the friction plate 36 .

The fixed cam 31 is a substantially disk-shaped member. The fixed cam 31 is arranged in the −X direction of the second support plate 45 . The tightening shaft 35 passes through the fixed cam 31 . A portion of the fixed cam 31 is fitted in the elongated hole 451 . Thereby, the fixed cam 31 does not rotate with respect to the second support plate 45 .

The movable cam 32 is a substantially disk-shaped member. The movable cam 32 is arranged in the −X direction of the fixed cam 31 . The tightening shaft 35 passes through the movable cam 32 . A portion of the movable cam 32 is fitted in the operating lever 39 . As a result, the movable cam 32 rotates together with the operating lever 39 . Therefore, the movable cam 32 rotates with respect to the fixed cam 31 . The movable cam 32 moves in the X direction according to the relative angle with respect to the fixed cam 31 . For example, the movable cam 32 has an inclined surface along the circumferential direction around the tightening shaft 35 . The fixed cam 31 has a recess into which the inclined surface of the movable cam 32 is fitted. When the movable cam 32 rotates from the state in which the inclined surface is fitted in the recess, the inclined surface rides on the fixed cam 31, thereby moving the movable cam 32 in the -X direction.

The operating lever 39 is a member for rotating the movable cam 32 . The operating lever 39 is arranged in the −X direction of the movable cam 32 . The tightening shaft 35 passes through the operating lever 39 . The operating lever 39 extends into the vehicle interior and is operated by an operator.

The nut 34 is arranged in the −X direction of the operating lever 39 . The nut 34 is attached to the male thread 352 of the tightening shaft 35 . Thrust bearing 33 is arranged between operating lever 39 and nut 34 . As a result, even if the operating lever 39 rotates, the nut 34 does not rotate. When the operating lever 39 is rotated, the movable cam 32 rotates while the tightening shaft 35 and the nut 34 do not rotate.

As shown in FIG. 8, case 37 is attached to operating lever 39 . Case 37 is fixed to operation lever 39 by fixing member 391 . The fixing member 391 is, for example, a bolt. The case 37 rotates together with the operating lever 39 . The case 37 is arranged in the −X direction of the operating lever 39 . The case 37 covers the tip of the tightening shaft 35 and the nut 34 .

The coil spring 38 is arranged inside the case 37 . Coil spring 38 is a compression coil spring. One end of the coil spring 38 contacts the case 37 . The other end of the coil spring 38 contacts the tightening shaft 35 . The coil spring 38 is compressed while being in contact with the case 37 and the tightening shaft 35 . Lubricant is applied to the surface of the coil spring 38 . Lubricants are, for example, greases. The coil spring 38 pulls the operating lever 39 toward the nut 34 . Therefore, even when the position of the steering column 50 can be adjusted (unlocked state), no gap is formed between the operating lever 39 and the thrust bearing 33 . Therefore, rattling of the operating lever 39 is suppressed.

When the operating lever 39 is rotated so that the movable cam 32 is separated from the fixed cam 31 , the head 351 of the tightening shaft 35 is pressed against the friction plate 36 and the fixed cam 31 is pressed against the second support plate 45 . This causes friction between the head 351 and the friction plates 36, friction between the plurality of friction plates 36, friction between the friction plates 36 and the first support plate 44, and friction between the fixed cam 31 and the second support. Friction with the plate 45 increases. Therefore, the tightening shaft 35 cannot move in the elongated holes 441 and 451, and the position of the steering column 50 in the Y direction (vertical direction) is fixed. Also, since the upper column 51 is tightened, the width of the slit 513 is reduced. The inner peripheral surface of the upper column 51 is pressed against the outer peripheral surface of the lower column 54 . Friction between the upper column 51 and the lower column 54 increases. Therefore, the tightening shaft 35 cannot move in the elongated holes 5141 and 5151, and the position of the upper column 51 in the Z direction (front-rear direction) is fixed.

When the operating lever 39 is rotated so that the movable cam 32 approaches the fixed cam 31, the friction between the head 351 and the friction plates 36, the friction between the plurality of friction plates 36, the friction plates 36 and the first The friction between the support plate 44 and the friction between the fixed cam 31 and the second support plate 45 are reduced or eliminated. As a result, the tightening shaft 35 can move in the elongated holes 441 and 451, and the steering column 50 can be adjusted in the Y direction (vertical direction). Moreover, since the width of the slit 513 of the upper column 51 is increased, the friction between the upper column 51 and the lower column 54 is reduced or eliminated. Therefore, the tightening shaft 35 can move in the long hole 5141 and the long hole 5151, and the position of the upper column 51 in the Z direction (front-rear direction) can be adjusted.

Steering support member 200 does not necessarily have to pass through second hole 151 as shown in FIG. All of the steering support members 200 may be arranged in the +Y direction with respect to the top plate 10 . In this case, the connecting portion 15 may not have the second hole 151 . Also, the connecting portion 15 does not necessarily have to have the two first holes 153 . The connecting portion 15 may have one first hole 153 or may not have any first holes 153 .

As described above, it includes the top plate 10 , the first bracket 40 , the second bracket 80 , the upper column 51 and the lower column 54 . The top plate 10 includes a first fixing portion 11 fixed to a steering support member 200 provided in the vehicle, a second fixing portion 12 arranged in front of the first fixing portion 11 and fixed to the steering support member 200, and a connecting portion 15 that connects the first fixing portion 11 and the second fixing portion 12 . The first bracket 40 is attached to the first fixing portion 11 so as to be detachable from the first fixing portion 11 . The second bracket 80 is attached to the second fixed part 12 so as to be rotatable relative to the second fixed part 12 . The upper column 51 supports the steering shaft 20 supported by the first bracket 40 and connected to the steering wheel 101 . Lower column 54 is fixed to second bracket 80 and connected to upper column 51 . The connecting portion 15 includes a first hole 153 that is an elongated hole extending along the axial direction of the upper column 51 . The first bracket 40 has a guide pin 47 passing through the first hole 153 . The second fixing portion 12 includes an upper wall 121 facing the steering support member 200, two side walls 123 connected to the second bracket 80, a rear wall 125 connected to the connecting portion 15, the upper wall 121 and the side walls. 123 and a slanted wall 127 located at a corner bounded by the rear wall 125 and slanted with respect to the top wall 121 , the side walls 123 and the rear wall 125 . The top wall 121 comprises a recess 1212 located between two sloping walls 127 and provided in the surface facing the steering support member 200 .

When the vehicle collides, a secondary collision occurs in which the operator collides with the steering wheel 101 . When a load equal to or greater than a predetermined load acts on the steering wheel 101 , the first bracket 40 separates from the first fixing portion 11 . After that, the first bracket 40 moves along the axial direction of the upper column 51 (lower column 54 ) as the guide pin 47 is guided by the first hole 153 . The upper column 51 moves together with the first bracket 40 . Friction between the upper column 51 and the lower column 54 absorbs the impact. However, when energy exceeding the energy that can be absorbed by the friction between upper column 51 and lower column 54 acts on steering device 100 , the load acting on first bracket 40 is applied to second fixed portion 12 via guide pin 47 . introduce. In the steering device 100 of this embodiment, the second fixing portion 12 has a top wall 121 , a side wall 123 , a rear wall 125 and an inclined wall 127 , and the top wall 121 has a recess 1212 . Therefore, the rigidity of the second fixing portion 12 is increased. Even when a large load acts on the second fixing portion 12, the second fixing portion 12 is less likely to deform. Therefore, the steering device 100 of this embodiment can prevent the steering wheel 101 from falling.

In the steering device 100 , the second fixing portion 12 has ribs 129 that protrude from the rear wall 125 and are connected to the connecting portion 15 . As a result, the rib 129 stretches between the rear wall 125 and the connecting portion 15 , so that the second fixing portion 12 is less likely to bend with respect to the connecting portion 15 . The steering device 100 of the present embodiment can further suppress deformation of the second fixing portion 12 when a load acts on the second fixing portion 12 .

In the steering device 100, the connecting portion 15 has a second hole 151 into which a portion of the steering support member 200 is inserted. Thereby, the steering device 100 of the present embodiment can suppress interference between the steering support member 200 and the top plate 10 even when the steering support member 200 is arranged near the top plate 10 .

In the steering device 100 , the first holes 153 are arranged on both sides of the second hole 151 so that the two guide pins 47 are guided to the first holes 153 respectively. The first bracket 40 moves straighter along the axial direction of the upper column 51 (lower column 54). Therefore, the energy that can actually be absorbed by the friction between the upper column 51 and the lower column 54 is less likely to deviate from the designed value. The steering device 100 of this embodiment can absorb a predetermined amount of energy through friction between the upper column 51 and the lower column 54 and can suppress deformation of the second fixing portion 12 .

10 Top plate 11 First fixed part 12 Second fixed part 15 Connection part 20 Steering shaft 21 Input shaft 22 Output shaft 30 Tightening mechanism 31 Fixed cam 32 Movable cam 33 Thrust bearing 34 Nut 35 Tightening shaft 36 Friction plate 37 Case 38 Coil spring 39 Operation lever 40 First bracket 41 Mounting plate 44 First support plate 45 Second support plate 47 Guide pin 48 Resin member 49 Detachable capsule 50 Steering column 51 Upper column 54 Lower column 80 Second bracket 81 Pivot shaft 100 Steering device 101 Steering Wheel 103 Universal joint 105 Intermediate shaft 107 Universal joint 109 Pinion shaft 121 Upper wall 123 Side wall 125 Rear wall 127 Inclined wall 129 Rib 151 Second hole 153 First hole 200 Steering support member 350 Shaft 351 Head 352 Male screw 441, 451 Long hole 511 Main body 513 Slits 514, 515 Protrusions 5141, 5151 Long hole 1211 Slit 1212 Concave part 1231 Hole Z Rotation shaft

Claims (4)

A first fixing portion fixed to a steering support member provided in a vehicle, a second fixing portion arranged in front of the first fixing portion and fixed to the steering support member, and the first fixing portion and the a top plate including a connecting portion that connects the second fixing portion;
a first bracket attached to the first fixing part so as to be detachable from the first fixing part;
a second bracket attached to the second fixed part so as to be rotatable relative to the second fixed part;
an upper column supporting a steering shaft supported by the first bracket and connected to a steering wheel;
a lower column fixed to the second bracket and connected to the upper column;
with
The connecting portion includes a first hole that is an elongated hole extending along the axial direction of the upper column,
the first bracket includes a guide pin penetrating the first hole,
The second fixing portion includes an upper wall facing the steering support member, two side walls connected to the second bracket, a rear wall connected to the connecting portion, the upper wall, the side walls and the a slanted wall positioned at a corner bounded by a rear wall and slanted with respect to the top wall, the side walls and the rear wall;
The upper wall comprises a recess located between the two inclined walls and provided in a surface facing the steering support member. The steering device according to claim 1, wherein the second fixing portion includes a rib that protrudes from the rear wall and is connected to the connecting portion. The steering device according to claim 1 or 2, wherein the connecting portion includes a second hole into which a portion of the steering support member is inserted. The steering device according to claim 3, wherein the first holes are arranged on both sides of the second hole.

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