JP2016165980A - Steering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steering device which can stabilize a release load, in a constitution in which a support shaft is sheared at a secondary collision.SOLUTION: In a steering device 1, a support shaft 51 is supported to a lower jacket 21 of a column jacket 4 which is telescopic to an axial direction together with a steering shaft. An engaged member 50 having a plurality of engaged teeth 56 is fixed to an upper jacket 20. An engagement part 52 is supported by the support shaft 51 so as to be displaceable between an engagement position for engaging with the engaged teeth 56 and an engagement release position for releasing the engagement with the engaged teeth 56. At a secondary collision, the support shaft 51 is sheared by a pair of shearing-scheduled parts 61 at both sides of the engagement member 52. A first holding part 81 of a guide member 80 which is supported to the lower jacket 21, and guides the engagement member 52 holds the engagement member 52 in an engagement position until the pair of shearing-scheduled parts 61 are sheared.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a steering device.

  In the steering column described in Patent Document 1 below, a steering shaft attached to a steering wheel is supported by an adjustment unit. The adjustment unit is supported by a support unit that fixes the steering column to the chassis of the automobile. In the open state of the tightening mechanism that is opened and closed by the operation lever, the position of the steering column can be adjusted in the axial direction of the steering shaft.

Fastening bolts are held on the side plates of the support unit. A lock member is disposed on the tightening bolt. A mating lock member is held on the side wall of the adjustment unit. When the tightening mechanism is closed, the lock member is pressed against the counterpart lock member. Thereby, the lock member and the mating lock member are engaged with each other.
The mating lock member is connected to the fracture plate. The fracture plate has a pair of weakening lines, and the fracture joining plate is defined between the weakening lines. At the time of a vehicle collision, a secondary collision in which a driver or the like collides with the steering wheel occurs. The counterpart lock member slides relative to the adjustment unit at the time of a secondary collision. At that time, when the mating lock member is pulled, the fracture joining plate is fractured along the weakening line.

Special table 2011-516323 gazette

The load when the adjustment unit is detached from the vehicle body due to the secondary collision is called the separation load. For example, in the steering column of Patent Document 1, a detachment load is generated when the fracture plate starts to break along the weakening line.
By the way, unlike the steering column of patent document 1, the structure which generate | occur | produces a detachment load by shearing the support shaft which supports a lock member is also considered. In this configuration, depending on how the impact of the secondary collision is applied, the posture of the lock member may not be maintained, and the engagement between the lock member and the counterpart lock member may be released before the support shaft is completely sheared. Occurrence is expected. In such a case, the separation load may not be stable.

  An object of the present invention is to provide a steering device capable of stabilizing a separation load in a configuration in which a support shaft is sheared at the time of a secondary collision.

  According to the first aspect of the present invention, the steering member (2) is connected to one end (3a), and the steering shaft (3) that can be expanded and contracted in the axial direction (X), the steering shaft is held, and the steering member side The upper jacket (20) and the lower jacket (21) opposite to the steering member are capable of extending and contracting in the axial direction together with the steering shaft by moving the upper jacket in the axial direction with respect to the lower jacket. A column jacket (4), a bracket (6) fixed to the vehicle body (22) and supporting the lower jacket, and a plurality of engaged teeth (56) fixed to the upper jacket and arranged along the axial direction And a support shaft (51) inserted and supported by the first support hole (33) of the lower jacket. And an insertion position (66a) through which the support shaft is inserted, and an engagement position at which the support shaft is engaged with the engaged tooth and an engagement release position at which the engagement with the engaged tooth is released. And a guide member (80) that is supported by the lower jacket and guides the engagement member, and the support shaft is configured to support the engagement member during a secondary collision. A pair of shear planned portions (61) on both sides of the engagement member is configured to be shearable, and the guide member engages the engagement member until the pair of shear planned portions are sheared at the time of a secondary collision. A steering device (1) including a first holding part (81) held in position.

According to a second aspect of the present invention, in the first aspect, the guide member has a second holding portion (82) that partitions the temporary holding space (85) in which the engagement member can be temporarily held together with the first holding portion. Is a steering device.
According to a third aspect of the present invention, in the first or second aspect, the operating member (40) is attached to one end, and is rotatably supported by being inserted into the second support hole (34) of the lower jacket. A rotation shaft (41), a transmission member (53) having an insertion hole (70a) through which the rotation shaft is inserted, supported by the rotation shaft, and transmitting the rotation of the rotation shaft to the engagement member; The guide member includes a third holding portion (83) capable of temporarily holding the transmission member.

According to a fourth aspect of the present invention, the guide member according to any one of the first to third aspects, wherein the pair of shearing scheduled portions are sheared at the time of a secondary collision, and then the engaging member is engaged with the engaged member. The steering device includes a fourth holding portion (84) that holds the position at which the engagement with the tooth is avoided.
A fifth aspect of the present invention is the steering apparatus according to any one of the first to fourth aspects, wherein the guide member is integrally formed with the lower jacket from a single material.

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

According to the first aspect of the present invention, at the time of the secondary collision, both the pair of planned shearing portions are sheared in a state where the engaging member is held at the engaging position by the first holding portion of the guide member. The Therefore, the separation load is stabilized.
According to the second aspect of the present invention, since the engaging member is temporarily held in the temporary holding space, it is easy to insert the support shaft into the insertion hole of the engaging member. Therefore, the assemblability can be improved.

According to the third aspect of the invention, since the transmission member is temporarily held by the third holding portion of the guide member, it is easy to insert the rotation shaft into the insertion hole of the transmission member. Therefore, the assemblability can be improved.
According to the fourth aspect of the present invention, after the pair of shear planned portions are sheared at the time of the secondary collision, the engaging member and the sheared support shaft fall from the lower jacket while allowing the column jacket to expand and contract. Can be prevented.

  According to the invention described in claim 5, the manufacturing cost is reduced.

1 is a schematic side view of a steering device according to an embodiment of the present invention. It is sectional drawing along the II-II line of FIG. It is sectional drawing along the III-III line of FIG. It is a disassembled perspective view of the lock mechanism periphery of this invention. It is sectional drawing along the VV line of FIG. It is the figure which showed the state which the engagement tooth of the engagement member and the division part of the to-be-engaged member contacted by the secondary collision. In FIG. 3, it is the figure which expanded the periphery of the support shaft after one shearing planned part was sheared by the secondary collision. It is the figure which showed the state after both the shear plan parts were sheared in FIG. It is the figure which showed the state before and behind making a lower jacket temporarily hold an engagement member and a transmission member in the assembly of a steering device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic side view of a steering apparatus 1 according to an embodiment of the present invention.
Referring to FIG. 1, the steering device 1 mainly includes a steering shaft 3, a column jacket 4, a lower bracket 5, an upper bracket (bracket) 6, a position adjustment mechanism 7, and a lock mechanism 8. Yes.

In the steering shaft 3, a steering member 2 such as a steering wheel is connected to one end 3 a in the axial direction X. The other end 3b of the steering shaft 3 is connected to the pinion shaft 13 of the steering mechanism 12 through the universal joint 9, the intermediate shaft 10, and the universal joint 11 in this order.
The steered mechanism 12 is, for example, a rack and pinion mechanism that steers steered wheels (not shown) in conjunction with the steering of the steering member 2. The rotation of the steering member 2 is transmitted to the steering mechanism 12 via the steering shaft 3 and the intermediate shaft 10. The rotation transmitted to the steering mechanism 12 is converted into an axial movement of a rack shaft (not shown). Thereby, a steered wheel is steered.

The steering shaft 3 includes a cylindrical upper shaft 15 and a lower shaft 16 that are fitted so as to be slidable relative to each other by, for example, spline fitting or serration fitting. The steering shaft 3 can be expanded and contracted in the axial direction X.
A steering shaft 3 is inserted into the column jacket 4. The column jacket 4 holds the steering shaft 3 and rotatably supports the steering shaft 3 via a plurality of bearings 17 and 18.

  The column jacket 4 includes a cylindrical upper jacket 20 that is an inner jacket, for example, and a lower jacket 21 that is an outer jacket, for example. The upper jacket 20 is disposed closer to the steering member 2 than the lower jacket 21. The lower jacket 21 is located on the opposite side of the steering member 2 with respect to the upper jacket 20. The upper jacket 20 and the lower jacket 21 are fitted so as to be capable of relative sliding in the axial direction X of the steering shaft 3.

  The upper jacket 20 supports the upper shaft 15 via a bearing 17 so as to be rotatable. The lower jacket 21 supports the lower shaft 16 via a bearing 18 so as to be rotatable. As the upper jacket 20 moves in the axial direction X of the steering shaft 3 with respect to the lower jacket 21, the column jacket 4 can expand and contract together with the steering shaft 3 in the axial direction X.

  The lower bracket 5 is a fixed bracket 23 fixed to the vehicle body 22, a tilt support shaft 24 supported by the fixed bracket 23, and a column fixed to the outer periphery of the lower jacket 21 and rotatably supported by the tilt support shaft 24. A bracket 25 is provided. The column jacket 4 and the steering shaft 3 are rotatable (tiltable) in the tilt direction Z with a tilt center CC that is the central axis of the tilt support shaft 24 as a fulcrum.

  The steering shaft 3 and the column jacket 4 are rotated (tilted) around the tilt center CC, whereby the position of the steering member 2 is adjusted in the tilt direction Z (so-called tilt adjustment). Further, the steering shaft 3 and the column jacket 4 are expanded and contracted in the axial direction X, whereby the position of the steering member 2 is adjusted in the telescopic direction (axial direction X) (so-called telescopic adjustment).

FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an exploded perspective view around the lock mechanism 8 of the present invention.
Referring to FIG. 2, the upper bracket 6 is for supporting the lower jacket 21. The upper bracket 6 includes a top plate 26 fixed to the vehicle body 22 by bolts or the like (not shown), and a pair of side plates 27 extending downward from the top plate 26 in the tilt direction Z. Each of the pair of side plates 27 is formed with a long tilting groove 28 extending in the tilt direction Z.

A slit 30 that extends in the axial direction X and cuts out one end of the lower jacket 21 is formed at a lower portion in the tilt direction Z at one end of the lower jacket 21. The slit 30 is exposed upward and downward in the axial direction X and downward in the tilt direction Z toward the outside of the lower jacket 21.
At one end of the lower jacket 21 (upper end in the axial direction X), a pair of support members 31 extending in the tilt direction Z while defining the slit 30 from the direction Y orthogonal to the axial direction X and the tilt direction Z are integrally provided. Yes.

  Referring to FIG. 3, the pair of support members 31 extends downward in the tilt direction Z from one end of the lower jacket 21. The pair of support members 31 face each other across the slit 30 in the orthogonal direction Y. Each of the pair of support members 31 is formed with a first support hole 33 that penetrates the support member 31 in the orthogonal direction Y at the same position when viewed from the orthogonal direction Y. The first support hole 33 has a diameter-expanded portion 35 whose diameter is increased on the outer side in the orthogonal direction Y.

Referring to FIG. 2, each of the pair of support members 31 is formed with a second support hole 34 penetrating the support member 31 in the orthogonal direction Y at the same position when viewed from the orthogonal direction Y. The second support hole 34 and the first support hole 33 are spaced apart from each other in the axial direction X (see FIG. 4).
A long hole 36 extending in the axial direction X is formed in the peripheral wall above the lower jacket 21. A pin 37 fixed to the upper jacket 20 is inserted into the long hole 36 so as to be movable in the axial direction X.

The position adjusting mechanism 7 locks the position of the steering member 2 (see FIG. 1) in the telescopic direction (axial direction X) and the tilt direction Z, or releases the lock of the position of the steering member 2 to thereby control the steering member 2. This is for adjusting the position.
The position adjustment mechanism 7 includes an operation member 40 that is manually rotated by a driver, a rotation shaft 41 having the operation member 40 attached to one end, a rotation cam 42 that rotates integrally with the operation member 40, and the rotation cam 42. And a first tightening member 43 which is a non-rotating cam engaged with the cam.

  The rotating shaft 41 is a bolt having a shaft portion 41a extending in the orthogonal direction Y, a head portion 41b provided at one end of the shaft portion 41a, and a screw portion 41c provided at the other end of the shaft portion 41a. The rotating shaft 41 is inserted through the pair of long grooves 28 and the pair of second support holes 34. Thereby, the rotating shaft 41 is rotatably supported by the lower jacket 21 via the pair of support members 31.

  Between the head portion 41 b of the rotating shaft 41 and the one side plate 27, a base end portion 40 a at one end in the longitudinal direction of the operating member 40, the rotating cam 42, and the first fastening member 43 are interposed. The rotating cam 42 and the first fastening member 43 are supported by the shaft portion 41 a in the vicinity of the head portion 41 b of the rotating shaft 41. The rotation cam 42 is restricted from moving in the axial direction (corresponding to the orthogonal direction Y) with respect to the rotation shaft 41. The first tightening member 43 is movable in the axial direction of the rotation shaft 41.

Further, the position adjusting mechanism 7 includes a nut 44 that is screw-engaged with the screw portion 41 c of the rotating shaft 41, a second tightening member 45 that is interposed between the other side plate 27 and the nut 44, and a second tightening member. And an interposed member 46 interposed between the nut 45 and the nut 44.
The second fastening member 45 and the interposition member 46 are supported in the vicinity of the nut 44 by the shaft portion 41a of the rotating shaft 41 so as to be movable in the axial direction of the rotating shaft 41 (corresponding to the orthogonal direction Y). The interposed member 46 includes a washer 47 interposed between the nut 44 and the second tightening member 45, and a needle roller bearing 48 interposed between the washer 47 and the second tightening member 45.

As the operating member 40 is rotated in the locking direction, the rotating cam 42 rotates with respect to the non-rotating cam (the first tightening member 43), so that the first tightening member 43 is in the axial direction of the rotating shaft 41. The both side plates 27 of the upper bracket 6 are sandwiched between the first tightening member 43 and the second tightening member 45. The pair of support members 31 are fastened by a pair of side plates 27.
Accordingly, the slit 30 between the pair of support members 31 is narrowed so that the diameter of the lower jacket 21 is reduced, and the lower jacket 21 is pressed against the upper jacket 20 to achieve tilt lock and telescopic lock.

Referring to FIG. 4, the lock mechanism 8 is for locking the position of the steering member 2 (see FIG. 1) by meshing teeth to ensure telescopic locking.
The lock mechanism 8 includes an engaged member 50 fixed to the outer peripheral surface 20a of the upper jacket 20, a support shaft 51 extending in the orthogonal direction Y, an engagement member 52 supported by the support shaft 51, and the operation member described above. 40 (see FIG. 2) and a rotation shaft 41, a transmission member 53 supported by the rotation shaft 41, and a biasing member 54 that biases the engagement member 52.

  The engaged member 50 has a plate shape elongated in the axial direction X, and is disposed in the slit 30 (see FIG. 2). The engaged member 50 has a plurality of engaged teeth 56 arranged along the axial direction X. In the present embodiment, the engaged teeth 56 are provided with holes 57 that are equidistant from each other in the axial direction X and extend in the orthogonal direction Y, and adjacent to the holes 57 from above and below in the axial direction X. A plurality of partitioning portions 58 partitioning the hole 57 from the direction X. Unlike the present embodiment, the engaged tooth 56 may be configured by straight teeth that protrude downward from the engaged member 50 in the tilt direction Z and extend in the orthogonal direction Y. An end portion of the engaged member 50 above the axial direction X is bent downward in the tilt direction Z to constitute a stopper 50a.

  The support shaft 51 integrally includes a small-diameter portion 59 and a small-diameter portion 59 and a large-diameter portion 60 that is coaxial with the small-diameter portion 59. The support shaft 51 is configured to be shearable at a pair of planned shearing portions 61 provided at intervals in the longitudinal direction of the small diameter portion 59. With reference to FIG. 3, the support shaft 51 is inserted into the first support hole 33 of one support member 31 at the large diameter portion 60, and the first support of the other support member 31 at the other end of the small diameter portion 59. It is inserted through the hole 33. As a result, the support shaft 51 is supported by the lower jacket 21 via the support member 31. The support shaft 51 may rotate around the central axis C <b> 1 extending along the orthogonal direction Y in the first support hole 33, or may be press-fitted into the first support hole 33 and not rotatable.

Both end portions of the support shaft 51 in the orthogonal direction Y reach the enlarged diameter portion 35. The support shaft 51 is positioned in the orthogonal direction Y with respect to the lower jacket 21 by a push nut 62 attached to the other end of the small diameter portion 59.
Referring to FIG. 4, the engaging member 52 includes a cylindrical boss portion 66 having an insertion hole 66 a, an engaging portion 67 extending in a radial direction of the boss portion 66 from a substantially center of the boss portion 66 in the orthogonal direction Y, and A contact portion 68 is integrally provided. The engaging portion 67 can engage with the engaged member 50, and the abutting portion 68 can abut on the transmission member 53.

The engaging portion 67 has an engaging tooth 69 that engages with the engaged tooth 56 of the engaged member 50 at the radially outer end of the boss portion 66. The engaging teeth 69 and the end portion 68 a of the abutting portion 68 are arranged at an interval in the circumferential direction of the boss portion 66.
Referring to FIG. 3, a portion exposed in slit 30 in small diameter portion 59 of support shaft 51 is inserted through insertion hole 66 a of boss portion 66. Thereby, the engaging member 52 is supported by the support shaft 51. When the support shaft 51 rotates about the central axis C <b> 1, the engagement member 52 rotates together with the support shaft 51, and when the support shaft 51 cannot rotate, the engagement member 52 moves relative to the support shaft 51. Relative rotation. The shearing portion 61 is located on both sides of the boss portion 66 of the engaging member 52 with respect to the orthogonal direction Y.

  With reference to FIG. 4, the transmission member 53 integrally includes a cylindrical boss portion 70 having an insertion hole 70 a and a pair of transmission portions 71 projecting radially outward from the boss portion 70 from the boss portion 70. . The pair of transmission parts 71 are spaced apart from each other in the circumferential direction of the boss part 70. A portion of the rotary shaft 41 exposed in the slit 30 is inserted through the insertion hole 70a (see FIG. 2). Thereby, the transmission member 53 is supported by the rotating shaft 41 so as to rotate integrally with the rotating shaft 41.

FIG. 5 is a cross-sectional view taken along line VV in FIG. In FIG. 5, the steering shaft 3 (see FIG. 3) is not shown for convenience of explanation.
Referring to FIG. 5, the transmission member 53 is fixed to the rotating shaft 41 so that the end portion 68 a of the contact portion 68 of the engagement member 52 is positioned between the pair of transmission portions 71.
When the transmission member 53 rotates together with the rotation shaft 41 in accordance with the rotation operation of the operation member 40 (see FIG. 2) in the locking direction, the transmission member 53 is moved from one transmission portion 71 to the boss portion 66 in the radially outward direction. The rotation of the rotary shaft 41 is transmitted to the end 68a of the contact portion 68 of the engaging member 52. Since the engaging member 52 rotates around the support shaft 51, the rotation of the rotation shaft 41 transmitted from the one transmission portion 71 is converted into rotation along the circumferential direction C of the support shaft 51. By rotating the operation member 40 in the locking direction, the rotation shaft 41 is finally rotated until the engagement tooth 69 of the engagement member 52 is engaged with any of the engagement teeth 56 of the engagement member 50. Is done. The position of the engaging member 52 in the circumferential direction C when the engaging tooth 69 and any of the engaged teeth 56 are engaged is referred to as an engaging position. In a state where the engagement member 52 is in the engagement position, the engagement tooth 69 of the engagement member 52 is opposed to the partition portion 58 constituting the engaged tooth 56 of the engaged member 50 in the axial direction X. .

Conversely, by rotating the operation member 40 (see FIG. 2) in the unlocking direction (the direction opposite to the locking direction), the rotation of the rotating shaft 41 is changed from the other transmission portion 71 to the end portion 68a of the contact portion 68. Is transmitted to. As a result, the engaging member 52 rotates along the circumferential direction C in the opposite direction.
By rotating the operation member 40 in the unlocking direction, the rotation shaft 41 finally moves until the engagement between the engagement tooth 69 of the engagement member 52 and the engagement tooth 56 of the engagement member 50 is released. To be rotated. The position of the engagement member 52 in the circumferential direction C when the engagement between the engagement tooth 69 and the engaged tooth 56 is released is referred to as an engagement release position (see a two-dot chain line in FIG. 5).

Thus, the engagement member 52 is supported by the support shaft 51 so as to be displaceable in the circumferential direction C between the engagement position and the engagement release position.
In the telescopic adjustment, the contraction of the column jacket 4 in the axial direction X is regulated by the contact between the engaging teeth 69 of the engaging member 52 and the stopper 50a of the engaged member 50. Further, in the telescopic adjustment, the extension of the column jacket 4 in the axial direction X is regulated by the abutment of the pin 37 on the upper jacket 20 and the peripheral edge in the axial direction X of the long hole 36.

  The urging member 54 is a spring formed by bending a wire or the like. The biasing member 54 extends from the coiled portion 73 around the outer peripheral surface of the boss portion 66 of the engaging member 52, and extends from the coiled portion 73, and the transmission member 53 at the end opposite to the coiled portion 73. The holding portion 74 that abuts on the boss portion 70 and the deformable portion 75 that abuts on the abutting portion 68 at the end 75 a opposite to the coil-like portion 73 are integrally provided. In the deformed portion 75, an end portion 75a opposite to the coiled portion 73 is bent (see FIG. 4).

Since the urging member 54 is deformed so that the space between the holding portion 74 and the deformation portion 75 is widened, the engagement member 52 is moved to the engagement position in order to return to the state before the urging member 54 is deformed. The abutting portion 68 of the engaging member 52 is biased so as to face. Accordingly, it is possible to prevent the engagement between the engagement tooth 69 of the engagement member 52 and the engaged tooth 56 of the engaged member 50 from being released unexpectedly.
Referring to FIG. 2, a guide member 80 for guiding the engaging member 52 and the transmission member 53 is provided on each of the opposing surfaces 31 a (surfaces on the slit 30 side) of the pair of support members 31. The pair of guide members 80 are supported by the lower jacket 21 via the pair of support members 31. Each of the pair of guide members 80 protrudes in the orthogonal direction Y from the facing surface 31 a of the corresponding support member 31. In this embodiment, each of the pair of guide members 80 is integrally formed with a corresponding support member 31 and a single material (aluminum or the like) by casting or the like, so that the manufacturing cost is reduced. The pair of guide members 80 may be a sintered part or a resin molded product. In these cases, the pair of guide members 80 are provided separately from the pair of support members 31.

Referring to FIG. 4, the guide member 80 of one support member 31 is assembled with the first holding portion 81 located below the first support hole 33 of the support member 31 in the tilt direction Z and the steering device 1. And a first holding portion 81 and a second holding portion 82 that partitions a first temporary holding space 85 (temporary holding space) for temporarily holding the engaging member 52.
The guide member 80 is positioned below the first holding portion 81 in the axial direction X, with the third holding portion 83 defining the second temporary holding space 86 for temporarily holding the transmission member 53 when the steering device 1 is assembled. And a fourth holding part 84. In the present embodiment, the guide member 80 integrally includes a first holding part 81, a second holding part 82, a third holding part 83, and a fourth holding part 84. However, at least a part of the holding units may be provided separately from the other holding units.

The first holding portion 81 has a first holding surface 81 a (a surface above the tilt direction Z) that can be held by receiving the boss portion 66 of the engaging member 52. The second holding portion 82 includes a portion disposed above the first support hole 33 in the tilt direction Z and a portion disposed above the first support hole 33 in the axial direction X.
The third holding portion 83 includes a portion disposed above the second support hole 34 in the tilt direction Z, a portion disposed above the second support hole 34 in the axial direction X, and the second support hole 34. And a portion disposed below the axial direction X (which is also a portion disposed above the first support hole 33 in the axial direction X in the second holding portion 82).

The first temporary holding space 85 is open toward the side opposite to the third holding portion 83 (downward in the axial direction X). The second temporary holding space 86 is opened downward in the tilt direction Z.
The fourth holding portion 84 has a second holding surface 84 a that is positioned further below the tilt direction Z than the first holding surface 81 a of the first holding portion 81 and can hold the boss portion 66 of the engaging member 52. An end portion 84 b of the fourth holding portion 84 below the axial direction X is bent upward in the tilt direction Z and upward in the axial direction X.

Since only one guide member 80 is illustrated in FIG. 4, the one guide member 80 has been described. Referring to FIG. 3, the other guide member 80 has a configuration symmetrical to one guide member 80 with a plane 3c including the central axis of the steering shaft 3 and extending in the tilt direction Z interposed therebetween. Is omitted.
Next, the operation of the steering device 1 at the time of a secondary collision will be described.

  FIG. 6 is a view showing a state where the engaging teeth 69 of the engaging member 52 and the partitioning portion 58 of the engaged member 50 are in contact with each other due to the secondary collision. 6, illustration of the steering shaft 3 and the urging member 54 is omitted for convenience of explanation (the same applies to FIG. 8 described later). FIG. 7 is an enlarged view of the periphery of the support shaft 51 after the one shearing planned portion 61 is sheared by the secondary collision in FIG. 3.

  Referring to FIG. 6, at the time of the secondary collision, as indicated by the solid line arrow, the load from the steering member 2 is transmitted to the upper jacket 20. Try to move to the other side. The engaged member 50 fixed to the upper jacket 20 tends to move together with the upper jacket 20. During operation of the vehicle, the position of the steering member 2 is normally locked, so that the engaging member 52 is located at the engaging position, and the engaging teeth 69 of the engaging member 52 are engaged members 50. Is opposed to the partition 58 constituting the engaged tooth 56 in the axial direction X. Therefore, at the time of the secondary collision, the engagement teeth 69 and the partition 58 collide. Since the support shaft 51 that supports the engagement member 52 receives an impact caused by the collision between the engagement teeth 69 and the partition portion 58, the small-diameter portion 59 of the support shaft 51 is sheared by the pair of planned shearing portions 61. As a result, the upper jacket 20 is detached from the vehicle body 22, and a separation load is generated.

  Referring to FIG. 7, the small-diameter portion 59 of the support shaft 51 is not necessarily sheared at the same time in the pair of shear planned portions 61, and may be sheared first in one shear planned portion 61 ( The sheared portion is shown as a shearing portion 90). In the present embodiment, for example, the shear planned portion 61 on the large diameter portion 60 side is sheared first, but the shear planned portion 61 on the opposite side to the large diameter portion 60 side may be sheared first. Yes. However, even in such a case, until the support shaft 51 is sheared in the pair of shearing planned portions 61, the engaging member 52 moves from the lower side in the tilt direction Z to the first holding surface 81 a of the first holding portion 81. Is held in the engaged position without tilting downward in the tilt direction Z on the shearing portion 90 side. Therefore, at the time of the secondary collision, both the pair of planned shearing portions 61 are sheared in a state where the engaging member 52 is held at the engaging position by the first holding portion 81. Therefore, the separation load is stabilized.

Further, since the guide member 80 is provided in the slit 30 without changing the structure of the lower jacket 21 and the lock mechanism 8, it is possible to suppress an increase in the size of the column jacket 4 and consequently an increase in the size of the steering device 1.
FIG. 8 is a diagram showing a state after both of the shear planned portions 61 are sheared in FIG.
Referring to FIG. 8, after the pair of shear planned portions 61 (see FIG. 3) is sheared at the time of the secondary collision, the engaging member 52 is moved from the first holding surface 81 a of the first holding portion 81 to the fourth holding portion. 84 falls to the second holding surface 84a and is received by the second holding surface 84a. Thereby, the engagement member 52 is held at a position where the engagement of the engaged member 50 with the engaged tooth 56 is avoided. Therefore, it is possible to prevent the engagement member 52 and the sheared small-diameter portion 59 of the support shaft 51 from dropping from the lower jacket 21 while allowing the column jacket 4 to expand and contract.

Further, since the end 84b of the fourth holding portion 84 below the axial direction X is bent upward in the tilt direction Z and upward in the axial direction X, the small diameter portion of the support shaft 51 sheared with the engaging member 52 59 can be reliably prevented from falling from the lower jacket 21.
FIG. 9 is a diagram illustrating a state before and after the engagement member 52 and the transmission member 53 are temporarily held by the lower jacket 21 in the assembly of the steering device 1.

Referring to FIG. 9, in assembling steering apparatus 1, support shaft 51 (see FIG. 4), engagement member 52, rotating shaft 41 (see FIG. 4), and transmission member 53 are assembled to lower jacket 21.
The assembly of each member to the lower jacket 21 may be performed in a state where the support member 31 of the lower jacket 21 is directed upward in the tilt direction Z. As shown by a broken line, by disposing the engaging member 52 in the first temporary holding space 85 from the opening side of the first temporary holding space 85, the engaging member 52 becomes the guide member 80 of the support member 31 of the lower jacket 21. Temporarily held. Since the engaging member 52 is temporarily held in the first temporary holding space 85, the support shaft 51 (see FIG. 4) can be easily inserted into the insertion hole 66a of the engaging member 52. Therefore, the assemblability can be improved.

  Further, the transmission member 53 is temporarily held by the guide members 80 of the pair of support members 31 of the lower jacket 21 by disposing the transmission member 53 in the second temporary holding space 86 of the third holding portion 83 from above the tilt direction Z. Is done. Since the transmission member 53 is temporarily held by the second temporary holding space 86, it is easy to insert the rotary shaft 41 (see FIG. 4) into the insertion hole 70 a of the transmission member 53. Therefore, the assemblability can be improved.

As described above, the first temporary holding space 85 functions as a pocket of the engaging member 52, and the second temporary holding space 86 functions as a pocket of the transmission member 53.
The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims.
For example, when the support shaft 51 is always sheared first by one of the planned shearing portions 61 at the time of a secondary collision, the pair of guide members 80 do not need to be provided, and corresponds to the one planned shearing portion 61. Only the guide member 80 to be provided may be provided.

Further, the support shaft 51 may not have the large-diameter portion 60 and may have a rod shape having a uniform diameter along the orthogonal direction Y.
The third holding part 83 includes a portion disposed below the second support hole 34 in the tilt direction Z, a portion disposed above the second support hole 34 in the axial direction X, and a second support. A portion disposed below the hole 34 in the axial direction X (which is also a portion above the first support hole 33 in the axial direction X in the second holding portion 82) may be included. In this case, the second temporary holding space 86 is partitioned from below in the tilt direction Z and from above and below in the axial direction X, and is opened upward in the tilt direction Z. According to this configuration, the transmission member 53 is disposed in the second temporary holding space 86 from above the tilt direction Z in a state where the support member 31 of the lower jacket 21 is directed downward in the tilt direction Z. Can be temporarily held by the guide member 80.

Even when the second holding portion 82 is not provided, the support member 31 of the lower jacket 21 is tilted in the first holding portion 81 by disposing the engaging member 52 from above the tilt direction Z. The engaging member 52 can be temporarily held by the guide member 80 in a state of being directed below Z.
The steering device 1 is a so-called lever-down type steering device in which the base end portion 40 a of the operation member 40 is disposed below the upper jacket 20 in the tilt direction Z. The lock mechanism 8 and the guide member 80 can also be applied to a so-called lever-mounted steering device in which 40a is disposed above the upper jacket 20 in the tilt direction Z.

  Further, the steering device 1 is not limited to a manual type steering device in which steering of the steering member 2 is not assisted, but is also a column assist type electric power steering device (C-EPS) in which steering of the steering member 2 is assisted by an electric motor. Good.

DESCRIPTION OF SYMBOLS 1 ... Steering device, 2 ... Steering member, 3 ... Steering shaft, 3a ... One end, 4 ... Column jacket, 6 ... Upper bracket, 20 ... Upper jacket, 21 ... Lower jacket, 22 ... Vehicle body, 33 ... 1st support hole, 34 ... second support hole, 40 ... operating member, 41 ... rotating shaft, 50 ... engaged member, 51 ... supporting shaft, 52 ... engaging member, 53 ... transmitting member, 56 ... engaged tooth, 61 ... shearing Planned portion, 66a ... insertion hole, 70a ... insertion hole, 80 ... guide member, 81 ... first holding portion, 82 ... second holding portion, 83 ... third holding portion, 84 ... fourth holding portion, 85 ... first Temporary holding space, X ... Axial direction

Claims (5)

A steering member connected to one end and capable of extending and contracting in the axial direction;
The steering shaft is held and has an upper jacket on the steering member side and a lower jacket opposite to the steering member, and the shaft along with the steering shaft is moved by the movement of the upper jacket relative to the lower jacket in the axial direction. A column jacket that can stretch in the direction,
A bracket fixed to the vehicle body and supporting the lower jacket;
An engaged member fixed to the upper jacket and having a plurality of engaged teeth arranged along the axial direction;
A support shaft inserted and supported in the first support hole of the lower jacket;
It has an insertion hole through which the support shaft is inserted, and can be displaced by the support shaft into an engagement position that engages with the engaged tooth and an engagement release position that releases engagement with the engaged tooth. An engagement member supported by
A guide member supported by the lower jacket and guiding the engagement member;
The support shaft is configured to be shearable with a pair of shear planned portions on both sides of the engagement member at the time of a secondary collision,
The steering device includes a first holding portion that holds the engagement member in the engagement position until the pair of shear planned portions are sheared at the time of a secondary collision.   The steering apparatus according to claim 1, wherein the guide member includes a second holding portion that partitions a temporary holding space in which the engagement member can be temporarily held together with the first holding portion. In Claim 1 or 2, the operating member is attached to one end, and the rotation shaft is rotatably supported by being inserted through the second support hole of the lower jacket;
A transmission member that has an insertion hole through which the rotation shaft is inserted, is supported by the rotation shaft, and transmits the rotation of the rotation shaft to the engagement member;
The steering device includes a third holding portion that can temporarily hold the transmission member.   The guide member according to any one of claims 1 to 3, wherein the guide member is positioned to avoid engagement with the engaged teeth after the pair of shear planned portions are sheared at the time of a secondary collision. A steering device including a fourth holding portion for holding.   5. The steering device according to claim 1, wherein the guide member is integrally formed with the lower jacket from a single material.

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