JP2008024170A - Steering device - Google Patents

Steering device Download PDF

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JP2008024170A
JP2008024170A JP2006199535A JP2006199535A JP2008024170A JP 2008024170 A JP2008024170 A JP 2008024170A JP 2006199535 A JP2006199535 A JP 2006199535A JP 2006199535 A JP2006199535 A JP 2006199535A JP 2008024170 A JP2008024170 A JP 2008024170A
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steering
inner cylinder
outer cylinder
piece
cylinder
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Michiaki Yamaoka
道明 山岡
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JTEKT Corp
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JTEKT Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a steering device with a simple constitution capable of certainly accomplishing desired impact absorption performance. <P>SOLUTION: In the steering device, a steering shaft 1 for transmitting operation of a steering wheel to a steering mechanism is supported at the inside of a cylindrical housing 2 provided with an inner cylinder 3 and an outer cylinder 4 internally/externally fitted over appropriate length, and impact energy of secondary collision applied to the steering shaft 1 through the steering wheel is absorbed by relative movement in a longitudinal direction generated under predetermined resistance between the inner cylinder 3 and the outer cylinder 4. An action piece 40 is projectedly provided on a lower end of the outer cylinder 4 in the longitudinal direction, and a part of a peripheral wall of the inner cylinder 3 is outwardly cut/stood. A corresponding pressing piece 30 is provided on an end of the action piece 40, and burst grooves 32, 32 extending in a longitudinal direction are provided on the peripheral wall of the inner cylinder 3 continuing to a lower side of the pressing piece 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、車両の衝突時に操舵部材に加わる二次衝突の衝撃エネルギを吸収するエネルギ吸収手段を備えるステアリング装置に関する。   The present invention relates to a steering apparatus including energy absorbing means for absorbing impact energy of a secondary collision applied to a steering member during a vehicle collision.

車両のステアリング装置の多くは、車室の内部に軸回りでの回転自在にステアリング軸を支持し、このステアリング軸の上端部に操舵部材としてのステアリングホイールを取付ける一方、下端部を車室の外部に配した舵取機構に連結して、運転者による車室内でのステアリングホイールの回転操作をステアリング軸を介して舵取機構に伝え、該舵取機構の動作により操舵用の車輪（一般的には左右の前輪）の向きを変えて操舵を実行するように構成されている。   Many vehicle steering devices support a steering shaft that is rotatable about an axis inside a passenger compartment, and a steering wheel as a steering member is attached to an upper end portion of the steering shaft, while a lower end portion is provided outside the passenger compartment. The steering wheel is connected to the steering mechanism, and the rotation operation of the steering wheel by the driver in the passenger compartment is transmitted to the steering mechanism via the steering shaft. Is configured to perform steering by changing the direction of the left and right front wheels.

このようなステアリング装置は、車両の前面衝突時に進行方向への慣性の作用によりステアリングホイールに衝突（二次衝突）する運転者に加わるダメージを軽減することを目的として、二次衝突の衝撃エネルギを吸収する衝撃吸収ステアリング装置として構成されることがある。この衝撃吸収ステアリング装置は、ステアリング軸を回転自在に支持する筒形のハウジングの中途に適長に亘って内外に嵌め合わせてなる内筒及び外筒を備え、前記内筒及び外筒の嵌め合い部が所定の抵抗下にて軸長方向に相対移動する間に二次衝突に伴う衝撃エネルギを吸収するように構成してある（例えば、特許文献１参照）。
特開２００２−２９３２４９号公報 Such a steering device is designed to reduce the impact energy of the secondary collision for the purpose of reducing the damage applied to the driver colliding with the steering wheel (secondary collision) due to the inertial effect in the traveling direction at the frontal collision of the vehicle. It may be configured as a shock absorbing steering device that absorbs. The shock absorbing steering device includes an inner cylinder and an outer cylinder that are fitted inside and outside for a suitable length in the middle of a cylindrical housing that rotatably supports a steering shaft, and the fitting of the inner cylinder and the outer cylinder While the part moves relative to the axial length direction under a predetermined resistance, it is configured to absorb impact energy associated with the secondary collision (see, for example, Patent Document 1).
JP 2002-293249 A

さて、以上の如く構成されたステアリング装置においては、ステアリングホイールに衝突する運転者には、内筒及び外筒の相対移動に伴う抵抗が反力として加わることから、運転者のダメージを軽減するという初期の目的を達成するには、内筒及び外筒を、摺動ストロークの全長に亘って略一定の抵抗下にて相対移動させることが重要である。   Now, in the steering device configured as described above, a driver colliding with the steering wheel is added with a reaction force due to the relative movement of the inner cylinder and the outer cylinder as a reaction force, thereby reducing the driver's damage. In order to achieve the initial purpose, it is important to move the inner cylinder and the outer cylinder relative to each other under a substantially constant resistance over the entire length of the sliding stroke.

前記特許文献１に記載されたステアリング装置においては、外筒の周壁をかしめ、夫々の位置の内周面に内向きに突出する各複数の突起を設け、これらの突起を、内筒の外周面に圧接させて、この圧接部にて移動抵抗を付加するように構成されている。しかしながらこの構成においては、前記抵抗の大きさが前記突起の圧接程度に依存するため、移動抵抗に固体差が生じ易く、所望の衝撃吸収性能を実現することが難しいという問題がある。   In the steering device described in Patent Document 1, the peripheral wall of the outer cylinder is caulked, and a plurality of protrusions protruding inward are provided on the inner peripheral surface of each position, and these protrusions are connected to the outer peripheral surface of the inner cylinder. It is comprised so that a movement resistance may be added in this press-contact part. However, in this configuration, since the magnitude of the resistance depends on the degree of pressure contact of the protrusions, there is a problem that a solid difference is likely to occur in the movement resistance and it is difficult to realize a desired shock absorbing performance.

また内筒と外筒との間に、ボール、リング等の抵抗部材を挾持し、これらの抵抗部材を介して移動抵抗を加えるようにしたステアリング装置も提案されている。この構成によれば、移動抵抗の精度を高めることができるが、部品点数が増加し、加工及び組立てのための工数が増大するという問題がある。   There has also been proposed a steering device in which a resistance member such as a ball or a ring is held between the inner cylinder and the outer cylinder, and movement resistance is applied via these resistance members. According to this configuration, it is possible to increase the accuracy of the movement resistance, but there is a problem that the number of parts increases and the man-hours for processing and assembly increase.

本発明は斯かる事情に鑑みてなされたものであり、ステアリング軸の支持ハウジングを構成する内筒と外筒とを略一定の抵抗下にて相対移動させ、所望の衝撃吸収性能を確実に実現することができる簡素な構成のステアリング装置を提供することを目的とする。   The present invention has been made in view of such circumstances, and the inner cylinder and the outer cylinder constituting the support housing of the steering shaft are moved relative to each other under a substantially constant resistance, so that a desired shock absorbing performance is reliably realized. An object of the present invention is to provide a steering device having a simple configuration that can be achieved.

本発明の第１発明に係るステアリング装置は、操舵部材の操作を舵取機構に伝えるステアリング軸を、適長に亘って内外に嵌合された内筒及び外筒を備える筒形のハウジングの内部に支持してなり、車両の衝突時に前記操舵部材を介して前記ステアリング軸に加わる二次衝突の衝撃エネルギを、前記内筒及び外筒間に所定の抵抗下にて生じる軸長方向の相対移動により吸収するステアリング装置において、前記外筒の前記内筒との嵌め合わせ側端部に軸長方向に突設された作用片と、前記内筒の周壁の一部を外向きに切り起こし、前記作用片の端部に一側を対向させて設けた押圧片と、該押圧片の他側に連続して前記内筒の周壁に形成され、軸長方向に延びる裂け溝とを備えることを特徴とする。   A steering apparatus according to a first aspect of the present invention is an interior of a cylindrical housing having an inner cylinder and an outer cylinder that are fitted inside and outside a steering shaft that transmits an operation of a steering member to a steering mechanism. The impact energy of the secondary collision applied to the steering shaft via the steering member at the time of a vehicle collision is relatively moved in the axial direction between the inner cylinder and the outer cylinder under a predetermined resistance. In the steering device that absorbs by the above, the action piece projecting in the axial length direction at the fitting side end of the outer cylinder with the inner cylinder, and a part of the peripheral wall of the inner cylinder are cut and raised outward, A pressing piece provided with one side facing the end of the action piece, and a tear groove formed on the peripheral wall of the inner cylinder continuously to the other side of the pressing piece and extending in the axial length direction. And

本発明の第２発明に係るステアリング装置は、第１発明における作用片の先端を内向きに曲げて形成され、前記押圧片の切り起こしにより前記内筒の周壁に残る開口に差し込まれた屈曲部を備えることを特徴とする。   A steering device according to a second aspect of the present invention is formed by bending the tip of the action piece inward according to the first aspect inward, and inserted into an opening remaining in the peripheral wall of the inner cylinder by cutting and raising the pressing piece. It is characterized by providing.

第１発明に係るステアリング装置においては、ステアリング軸の支持ハウジングを構成する内筒と外筒とが、二次衝突に伴う衝撃力の作用により軸長方向に相対移動するとき、外筒に設けた作用片が内筒に設けた押圧片を押圧し、この押圧片の他側に連続する裂け溝を引き裂き、この引き裂き抵抗に抗して内筒と外筒とが軸長方向に相対移動することにより二次衝突の衝撃エネルギを吸収するから、裂け溝の寸法管理により所望の衝撃吸収性能を簡素な構成にて実現することができる。   In the steering apparatus according to the first aspect of the present invention, the inner cylinder and the outer cylinder constituting the support housing for the steering shaft are provided in the outer cylinder when they move relative to each other in the axial length direction due to the impact force caused by the secondary collision. The action piece presses the pressing piece provided on the inner cylinder, tears the continuous tear groove on the other side of the pressing piece, and the inner cylinder and the outer cylinder move relative to each other in the axial direction against the tearing resistance. Thus, the impact energy of the secondary collision is absorbed, so that the desired shock absorbing performance can be realized with a simple configuration by managing the dimensions of the tear groove.

第２発明に係るステアリング装置においては、押圧片の切り起こし後に残る開口に、作用片の先端を内向きに曲げて設けた屈曲部を差し込んであるから、押圧片を押圧する作用片が屈曲部の案内作用により押圧片の内側に潜りこみ、以降の相対移動に伴う作用力が押圧片に連続する裂け溝に集中し、この裂け溝の引き裂き抵抗に抗して生じる内筒と外筒との相対移動を安定して行わせ、所望の衝撃吸収性能を確実に実現することができる等、本発明は優れた効果を奏する。   In the steering device according to the second aspect of the invention, the bending portion provided by bending the tip of the action piece inward is inserted into the opening remaining after the pressing piece is cut and raised, so that the action piece that presses the pressing piece is the bending portion. Due to the guide action, the inner part of the inner part and the outer part of the inner cylinder and the outer cylinder are generated against the tearing resistance of the tear groove. The present invention has an excellent effect such that the relative movement can be performed stably and the desired shock absorbing performance can be realized with certainty.

以下本発明をその実施の形態を示す図面に基づいて詳述する。図１は、本発明に係るステアリング装置の全体構成を示す模式図である。   Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1 is a schematic diagram showing an overall configuration of a steering apparatus according to the present invention.

図中１は、ステアリング軸であり、該ステアリング軸１は、円筒形をなすコラムハウジング２の内部に同軸上での回転自在に支承されている。コラムハウジング２は、中途部に固設されたアッパブラケット20と、一側端部に固設されたロアブラケット21とにより、ロアブラケット21の側を前下方（図における左下方）に向けた傾斜姿勢にて車室の内部に支持されている。   In the figure, reference numeral 1 denotes a steering shaft, and the steering shaft 1 is rotatably supported coaxially inside a column housing 2 having a cylindrical shape. The column housing 2 is inclined with the upper bracket 20 fixed at the midway part and the lower bracket 21 fixed at one side end so that the lower bracket 21 side is directed forward and downward (lower left in the figure). It is supported inside the passenger compartment by its posture.

コラムハウジング２の上部に突出するステアリング軸１の上端部には、車室内部の運転者に対面するように操舵部材としてのステアリングホイール10が嵌着固定され、同じく下部に突出するステアリング軸１の下端部は、両端にユニバーサルジョイント12，12を備える中間軸11を介して舵取機構13の入力軸14に連結されている。以上の構成により、操舵のためにステアリングホイール10が回転操作された場合、この操作に応じたステアリング軸１の回転が、中間軸11及び入力軸14を介して舵取機構13に伝達され、該舵取機構13の動作により操舵が実行される。   A steering wheel 10 as a steering member is fitted and fixed to the upper end portion of the steering shaft 1 protruding above the column housing 2 so as to face the driver in the vehicle interior, and the steering shaft 1 also protrudes downward. The lower end is connected to the input shaft 14 of the steering mechanism 13 via an intermediate shaft 11 having universal joints 12 and 12 at both ends. With the above configuration, when the steering wheel 10 is rotated for steering, the rotation of the steering shaft 1 corresponding to this operation is transmitted to the steering mechanism 13 via the intermediate shaft 11 and the input shaft 14, Steering is executed by the operation of the steering mechanism 13.

なお、図１に示すステアリング装置は、コラムハウジング２の下端部近傍に取付けた操舵補助用のモータ22を備えており、このモータ22の回転をコラムハウジング２内部のステアリング軸１に伝えて、前述の如く行われる操舵を補助する電動パワーステアリング装置として構成されているが、本発明の特徴である以下に示す衝撃吸収構造は、ステアリングホイール10の回転操作を舵取機構13に直接的に伝えて操舵を行わせるマニュアル式のステアリング装置にも適用可能であり、また舵取機構13に付設された油圧シリンダの発生力により操舵を補助する油圧パワーステアリング装置にも適用可能であることは言うまでもない。   The steering apparatus shown in FIG. 1 includes a steering assist motor 22 attached in the vicinity of the lower end portion of the column housing 2, and the rotation of the motor 22 is transmitted to the steering shaft 1 inside the column housing 2 so as to be described above. The impact absorbing structure shown below, which is a feature of the present invention, directly transmits the rotation operation of the steering wheel 10 to the steering mechanism 13. Needless to say, the present invention can also be applied to a manual steering device that performs steering, and can also be applied to a hydraulic power steering device that assists steering by the generated force of a hydraulic cylinder attached to the steering mechanism 13.

コラムハウジング２の内部には、モータ22の取付け部よりも上位置に、ステアリングホイール10の回転操作に応じてステアリング軸１に加わる操舵トルクを検出するトルクセンサ23が設けてあり、操舵補助用のモータ22は、トルクセンサ23による検出トルクに基づいて駆動される構成となっている。この駆動は、広く実施されているように、トルクセンサ23による検出トルクにより決定される基準補助力を、車速、旋回程度等の走行状態の検出結果に基づいて補正した補助力を発生すべく実施することができる。   Inside the column housing 2, a torque sensor 23 for detecting a steering torque applied to the steering shaft 1 in response to the rotation operation of the steering wheel 10 is provided above the mounting portion of the motor 22. The motor 22 is configured to be driven based on torque detected by the torque sensor 23. As is widely implemented, this driving is performed to generate an auxiliary force that is obtained by correcting the reference auxiliary force determined by the torque detected by the torque sensor 23 based on the detection result of the running state such as the vehicle speed and the degree of turning. can do.

トルクセンサ23の上位置に連続するコラムハウジング２の上半部は、適長に亘って内外に嵌合され、軸長方向への相対移動可能に組み合わせた内筒３及び外筒４を備えている。アッパブラケット20は、外筒４の中途部に固設される一方、車体の一部にカプセル24を介して連結してあり、ステアリングホイール10を介してコラムハウジング２に下向きに加わる所定限度を超える力の作用により、車体にカプセル24を残して下方に離脱する公知のブレークアウエイブラケットとして構成されている。   The upper half of the column housing 2 that continues to the upper position of the torque sensor 23 includes an inner cylinder 3 and an outer cylinder 4 that are fitted inside and outside over an appropriate length and combined so as to be relatively movable in the axial direction. Yes. The upper bracket 20 is fixed to the middle part of the outer cylinder 4, and is connected to a part of the vehicle body via a capsule 24 and exceeds a predetermined limit applied downward to the column housing 2 via the steering wheel 10. It is configured as a well-known breakaway bracket that leaves the capsule 24 in the vehicle body and is separated downward by the action of force.

図２は、内筒３及び外筒４の嵌合部の外嵌斜視図である。本図に示す如く下側に位置する内筒３には、外側に嵌め込まれる外筒４の下端縁よりも下位置に、周壁の一部を下辺を余して矩形に切り起こし、径方向外向きに立ち上げてなる複数の押し片30，30…と、夫々の押し片30，30…の切り起こし跡として残る矩形の開口31，31…とが設けてある。なお図中の押し片30，30…及び開口31，31…は、周方向の４か所（２か所のみ図示）に等配してあるが、これらの押し片30，30…及び開口31，31…は、周方向の複数か所に設けてあればよく、等配をなして設けてあるのが望ましい。   FIG. 2 is an external perspective view of the fitting portion of the inner cylinder 3 and the outer cylinder 4. As shown in this figure, the inner cylinder 3 located on the lower side is cut down and raised in a rectangular shape with a part of the peripheral wall below the lower end edge of the outer cylinder 4 fitted to the outside, leaving a lower side. A plurality of push pieces 30, 30..., Which are raised in the direction, and rectangular openings 31, 31... Remaining as cut traces of the respective push pieces 30, 30. In the figure, the pressing pieces 30, 30 ... and the openings 31, 31 ... are equally arranged at four places in the circumferential direction (only two places are shown). , 31... Need only be provided at a plurality of locations in the circumferential direction, and are preferably provided in a uniform manner.

このような押し片30，30…の下側には、残された下辺の両端を基端とし、軸長方向に延びる各２本の裂け溝32，32が形成されている。これらの裂け溝32，32は、図示の如く、周壁の外面を所定の深さに穿って形成された細幅の直線状の溝であり、他部よりも低強度として、夫々に対応する押し片30，30…への作用力が集中するように設けてある。   Two such split grooves 32, 32 extending in the axial length direction are formed on the lower side of the push pieces 30, 30,. As shown in the figure, these tear grooves 32 and 32 are narrow linear grooves formed by drilling the outer surface of the peripheral wall to a predetermined depth, and have a lower strength than the other parts, respectively. It is provided so that the acting force on the pieces 30, 30 ... is concentrated.

一方、上側に位置する外筒４には、内筒３への嵌め込み側となる下端の周縁に、内筒３に設けた押し片30，30…と同数（２つのみ図示）の作用片40，40…が等配をなして設けてある。図示の作用片40，40…は、外筒４の下周縁の外周に基端を固定し、下方に向けて軸長方向に延設された細幅の板であり、夫々の先端には、適長に亘って内向きに屈曲させてなる屈曲部41，41…が設けてある。なお作用片40，40…の固定は、例えば、溶接により実現することができ、また作用片40，40…は、外筒４と一体に設けることも可能である。   On the other hand, the outer cylinder 4 positioned on the upper side has the same number of action pieces 40 (only two are shown) as the pressing pieces 30, 30... 40 ... are evenly distributed. The illustrated action pieces 40, 40... Are narrow plates extending in the axial length direction with the base end fixed to the outer periphery of the lower peripheral edge of the outer cylinder 4. Bending portions 41, 41... Bent inward over an appropriate length are provided. .. Can be realized by welding, for example, and the action pieces 40, 40... Can be provided integrally with the outer cylinder 4.

このように構成された内筒３と外筒４とは、前者の押し片30，30…と後者の作用片40，40…とが周方向に整合するように位置決めして嵌め合わせ、作用片40，40…の先端の屈曲部41，41…を開口31，31…に差し込み、屈曲部41，41…を備える作用片40，40…の先端部を内筒３に設けた押し片30，30…と対向させて図２に示す如く組み付けられて、コラムハウジング２を構成している。   The inner cylinder 3 and the outer cylinder 4 configured in this manner are positioned and fitted so that the former push pieces 30, 30... And the latter action pieces 40, 40. The bent portions 41, 41 ... of the tips of 40, 40 ... are inserted into the openings 31, 31 ..., and the push pieces 30 provided on the inner cylinder 3 with the tips of the action pieces 40, 40 ... provided with the bent portions 41, 41 ..., As shown in FIG. 2, the column housing 2 is configured so as to face 30.

図３は、内筒３及び外筒４の相対移動を伴って生じるコラムハウジング２の短縮動作の説明図である。図３（ａ）は、組み付け時の状態を示しており、前述した如く内筒３と外筒４とは、夫々の端縁から所定長に亘って内外に嵌め合わせてあり、内筒３に設けた押し片30と外筒４に設けた作用片40の先端とが対向した状態にある。   FIG. 3 is an explanatory diagram of the shortening operation of the column housing 2 that occurs with the relative movement of the inner cylinder 3 and the outer cylinder 4. FIG. 3A shows a state at the time of assembly. As described above, the inner cylinder 3 and the outer cylinder 4 are fitted to the inner cylinder 3 from the respective end edges to the inner and outer sides over a predetermined length. The provided pressing piece 30 and the tip of the action piece 40 provided on the outer cylinder 4 are in a state of facing each other.

図３（ｂ）及び図３（ｃ) は、コラムハウジング２に軸長方向の力が下向き（外筒４から内筒３に向かう力）に加わった状態が示してある。このときコラムハウジング２は、内筒３及び外筒４の嵌合長さを増すことによりテレスコピックに短縮することができ、この短縮により、外筒４に設けた作用片40の先端の屈曲部42が内筒３に押し片30に衝突し、図３（ｂ）に示すように、屈曲部42が対応する押し片30の内側に潜り込み、作用片40が内向きに屈曲するように変形する。   FIGS. 3B and 3C show a state in which a force in the axial length direction is applied to the column housing 2 downward (force directed from the outer cylinder 4 toward the inner cylinder 3). At this time, the column housing 2 can be shortened telescopically by increasing the fitting length of the inner cylinder 3 and the outer cylinder 4, and by this shortening, the bent portion 42 at the tip of the action piece 40 provided on the outer cylinder 4. As shown in FIG. 3 (b), the inner cylinder 3 collides with the pressing piece 30, and the bending portion 42 is submerged inside the corresponding pressing piece 30, and the action piece 40 is deformed so as to be bent inward.

このとき内筒３の押し片30には、図３（ｂ）中に白抜矢符にて示す如く、作用片40から下方向外向きの押し力が加わり、この力は、図２に示すように押し片30の下側に連続して設けられた裂け溝32，32に集中し、これらの裂け溝32，32が裂け始める。この後、内筒３と外筒４とは、図３（ｃ）に示すように、作用片40から押し片30に加わる押し力の作用により、該押し片30の下側の裂け溝32，32間に挟まれたリッピング部を外側に引き剥がすように嵌合長さを増し、コラムハウジング２の短縮は更に進行する。   At this time, as shown by the white arrow in FIG. 3B, the pushing piece 30 of the inner cylinder 3 receives a downward outward pushing force from the action piece 40, and this force is shown in FIG. Thus, it concentrates on the tear grooves 32 and 32 provided continuously below the pressing piece 30, and these tear grooves 32 and 32 begin to tear. Thereafter, as shown in FIG. 3C, the inner cylinder 3 and the outer cylinder 4 are separated from each other by a split groove 32 on the lower side of the pressing piece 30 by the action of a pressing force applied from the acting piece 40 to the pressing piece 30. The fitting length is increased so that the ripped portion sandwiched between 32 is peeled outward, and the shortening of the column housing 2 further proceeds.

このようにして進行するコラムハウジング２の短縮は、裂け溝32，32間に挟まれたリッピング部が引き剥がされる際の抵抗下にて生じ、この抵抗の大きさは、裂け溝32，32の寸法（深さ及び幅）に依存する。裂け溝32，32は、前述の如く、内筒３の周壁を外向きに切り起こしてなる押し片30に連続しており、例えば、押し片30の切り起こしと同時に裂け溝32，32を成形する手順により、高精度に寸法管理して設けることが可能であり、コラムハウジング２の短縮を一定の抵抗下にて行わせることができる。   The shortening of the column housing 2 that progresses in this way occurs under resistance when the ripped portion sandwiched between the tearing grooves 32 and 32 is peeled off. Depends on dimensions (depth and width). As described above, the tear grooves 32 and 32 are continuous with the pushing piece 30 formed by cutting and raising the peripheral wall of the inner cylinder 3 outward. For example, the tearing grooves 32 and 32 are formed at the same time as the pushing piece 30 is cut and raised. According to the procedure, it is possible to provide the dimensions with high accuracy, and the column housing 2 can be shortened under a certain resistance.

また内筒３の外側に立ち上がるように押し片30を設け、この押し片30に外筒４に設けた作用片40を対向させてあるから、内筒３及び外筒４の短縮時の作用力を、押し片30及びこれの下部に連続する裂け溝32，32に確実に伝えることができる。更に、押し片30及び作用片40は、内筒３及び外筒４の周方向に各複数設けてあり、夫々の位置にて前述した抵抗が発生する。従って、コラムハウジング２の短縮は安定して生じる。   Further, since the pressing piece 30 is provided so as to rise outside the inner cylinder 3 and the action piece 40 provided on the outer cylinder 4 is opposed to the pressing piece 30, the acting force when the inner cylinder 3 and the outer cylinder 4 are shortened. Can be reliably transmitted to the pushing piece 30 and the split grooves 32, 32 continuous to the lower part thereof. Further, a plurality of push pieces 30 and action pieces 40 are provided in the circumferential direction of the inner cylinder 3 and the outer cylinder 4, and the above-described resistance is generated at each position. Therefore, the shortening of the column housing 2 occurs stably.

押し片30及び作用片40の並設数は、内筒３及び外筒４の周方向長さの範囲内にて適宜に設定することができるが、過剰な並設は内筒３及び外筒４の強度低下を伴うことから、実施の形態に示す４か所以下とするのが適当である。押し片30及び作用片40は、前述した如く周方向に等配するのが望ましく、これにより、短縮時の抵抗が周方向に均等化され、内筒３と外筒４との間にこじれを生じることなく安定した短縮を実現することができる。   The number of the push pieces 30 and the action pieces 40 arranged in parallel can be set as appropriate within the range of the circumferential lengths of the inner cylinder 3 and the outer cylinder 4, but excessive juxtaposition is the inner cylinder 3 and the outer cylinder. 4 is accompanied by a decrease in strength, so that it is appropriate to use 4 or less as shown in the embodiment. As described above, it is desirable that the push piece 30 and the action piece 40 are equally arranged in the circumferential direction, so that the resistance at the time of shortening is equalized in the circumferential direction, and the twist between the inner cylinder 3 and the outer cylinder 4 is prevented. Stable shortening can be realized without occurring.

以上の如き内筒３及び外筒４を備えるコラムハウジング２には、車両の前面衝突時に、前方への慣性の作用によりステアリングホイール10に運転者が衝突（二次衝突）することにより、図１中に白抜矢符にて示す如く、軸長方向下向きの力が加わる。   In the column housing 2 having the inner cylinder 3 and the outer cylinder 4 as described above, when the driver collides with the steering wheel 10 (secondary collision) due to the inertia of the front during the frontal collision of the vehicle, FIG. As indicated by the white arrow inside, a downward force in the axial direction is applied.

このとき、前述の如くブレークアウエイブラケットとして構成されたアッパブラケット20が車体から離脱し、該アッパブラケット20による拘束が解除された外筒４が、内筒３に対して嵌め合い長さを増しつつ相対移動し、コラムハウジング２が短縮せしめられる。この短縮は、前述の如く、外筒４の作用片40が内筒３の押し片30を押圧し、押し片30の下部に連続する裂け溝32，32の引き裂きを伴って、これらの裂け溝32，32の延設長さに相当するストローク（図１中のＳ）間にて生じ、この短縮の間に二次衝突の衝撃エネルギが吸収される。この間、ステアリングホイール10に衝突した運転者には、裂け溝32，32の引き裂きに伴う抵抗が反力として加わるのみであり、運転者は、大なるダメージを受けることなく二次衝突による衝撃から保護される。   At this time, as described above, the upper bracket 20 configured as a breakaway bracket is detached from the vehicle body, and the outer cylinder 4 released from the restraint by the upper bracket 20 is fitted to the inner cylinder 3 while increasing the length thereof. The relative movement causes the column housing 2 to be shortened. As described above, the shortening is performed by the action piece 40 of the outer cylinder 4 pressing the pushing piece 30 of the inner cylinder 3 and tearing the tearing grooves 32, 32 continuous to the lower part of the pushing piece 30. It occurs during a stroke (S in FIG. 1) corresponding to the extended length of 32, 32, and the impact energy of the secondary collision is absorbed during this shortening. During this time, the driver who has collided with the steering wheel 10 is only subjected to the resistance caused by the tearing of the tear grooves 32, 32 as a reaction force, and the driver is protected from the impact caused by the secondary collision without taking much damage. Is done.

本発明に係るステアリング装置の全体構成を示す模式図である。It is a mimetic diagram showing the whole steering device composition concerning the present invention. 内筒及び外筒の嵌合部の外嵌斜視図である。It is an external fitting perspective view of the fitting part of an inner cylinder and an outer cylinder. 内筒及び外筒の相対移動を伴って生じるコラムハウジングの短縮動作の説明図である。It is explanatory drawing of the shortening operation | movement of the column housing which arises with the relative movement of an inner cylinder and an outer cylinder.

符号の説明Explanation of symbols

１ ステアリング軸、２ ハウジング、３ 内筒、４ 外筒、10 ステアリングホイール（操舵部材）、13 舵取機構、作用片、30 押圧片、31 開口、32 裂け溝、40 作用片、41 屈曲部   DESCRIPTION OF SYMBOLS 1 Steering shaft, 2 Housing, 3 Inner cylinder, 4 Outer cylinder, 10 Steering wheel (steering member), 13 Steering mechanism, Acting piece, 30 Pressing piece, 31 Opening, 32 Split groove, 40 Acting piece, 41 Bending part

Claims (2)

操舵部材の操作を舵取機構に伝えるステアリング軸を、適長に亘って内外に嵌合された内筒及び外筒を備える筒形のハウジングの内部に支持してなり、車両の衝突時に前記操舵部材を介して前記ステアリング軸に加わる二次衝突の衝撃エネルギを、前記内筒及び外筒間に所定の抵抗下にて生じる軸長方向の相対移動により吸収するステアリング装置において、
前記外筒の前記内筒との嵌め合わせ側端部に軸長方向に突設された作用片と、
前記内筒の周壁の一部を外向きに切り起こし、前記作用片の端部に一側を対向させて設けた押圧片と、
該押圧片の他側に連続して前記内筒の周壁に形成され、軸長方向に延びる裂け溝と
を備えることを特徴とするステアリング装置。 The steering shaft for transmitting the operation of the steering member to the steering mechanism is supported inside a cylindrical housing having an inner cylinder and an outer cylinder fitted inside and outside for an appropriate length, and the steering is performed in the event of a vehicle collision. In a steering device that absorbs impact energy of a secondary collision applied to the steering shaft via a member by a relative movement in the axial length direction generated under a predetermined resistance between the inner cylinder and the outer cylinder,
An action piece projecting in the axial direction at the fitting side end of the outer cylinder with the inner cylinder;
A part of the peripheral wall of the inner cylinder is cut and raised outward, and a pressing piece provided with one side facing the end of the working piece;
A steering device comprising: a tear groove formed on a peripheral wall of the inner cylinder continuously to the other side of the pressing piece and extending in the axial length direction. 前記作用片の先端を内向きに曲げて形成され、前記押圧片の切り起こしにより前記内筒の周壁に残る開口に差し込まれた屈曲部を備える請求項１記載のステアリング装置。   The steering apparatus according to claim 1, further comprising a bent portion formed by bending a tip of the action piece inwardly and inserted into an opening remaining in a peripheral wall of the inner cylinder by cutting and raising the pressing piece.
JP2006199535A 2006-07-21 2006-07-21 Steering device Pending JP2008024170A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006199535A JP2008024170A (en) 2006-07-21 2006-07-21 Steering device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006199535A JP2008024170A (en) 2006-07-21 2006-07-21 Steering device

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JP2008024170A true JP2008024170A (en) 2008-02-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010018182A (en) * 2008-07-11 2010-01-28 Nsk Ltd Steering device
JP2013100002A (en) * 2011-11-08 2013-05-23 Fuji Kiko Co Ltd Steering column device
US11014598B2 (en) * 2016-10-19 2021-05-25 Thyssenkrupp Presta Ag Steering column comprising an energy absorption device for a motor vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010018182A (en) * 2008-07-11 2010-01-28 Nsk Ltd Steering device
JP2013100002A (en) * 2011-11-08 2013-05-23 Fuji Kiko Co Ltd Steering column device
US11014598B2 (en) * 2016-10-19 2021-05-25 Thyssenkrupp Presta Ag Steering column comprising an energy absorption device for a motor vehicle

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