JP2013067280A - Steering shaft connection structure - Google Patents

Steering shaft connection structure Download PDF

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Publication number
JP2013067280A
JP2013067280A JP2011207581A JP2011207581A JP2013067280A JP 2013067280 A JP2013067280 A JP 2013067280A JP 2011207581 A JP2011207581 A JP 2011207581A JP 2011207581 A JP2011207581 A JP 2011207581A JP 2013067280 A JP2013067280 A JP 2013067280A
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Japan
Prior art keywords
yoke
shaft
insertion hole
gear shaft
gear
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JP2011207581A
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Japanese (ja)
Inventor
Kentaro Suzuki
健太郎 鈴木
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Priority to JP2011207581A priority Critical patent/JP2013067280A/en
Priority to PCT/JP2012/074067 priority patent/WO2013042728A1/en
Publication of JP2013067280A publication Critical patent/JP2013067280A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • B62D1/20—Connecting steering column to steering gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D1/108—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling
    • F16D1/116—Quick-acting couplings in which the parts are connected by simply bringing them together axially having retaining means rotating with the coupling and acting by interengaging parts, i.e. positive coupling the interengaging parts including a continuous or interrupted circumferential groove in the surface of one of the coupling parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
    • F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
    • F16D1/0852—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping between the mating surfaces of the hub and shaft
    • F16D1/0864—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping between the mating surfaces of the hub and shaft due to tangential loading of the hub, e.g. a split hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/103—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Steering Controls (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a steering shaft connection structure capable of easily positioning a yoke of a steering shaft with a gear shaft and performing confirmation work.SOLUTION: The shaft end 3a of a pinion shaft 3 extending outward from a housing opening 2 of a gear housing 1 is inserted into a gear shaft insertion hole 8 in a yoke 7 provided at an end of a steering shaft. At a predetermined insertion position at which a bolt insertion hole 14 in the yoke 7 is superimposed on an engagement groove 5 in the shaft end 3a of the pinion shaft 3, a pinch bolt is inserted from the bolt insertion hole 14 and inserted through the engagement groove 5, which is provided in the shaft end 3a of the pinion shaft 3, and tightened to tighten the yoke 7, thereby reducing the diameter of the yoke 7 to join the yoke 7 to the pinion shaft 3. When inserting the pinion shaft 3 into the gear shaft insertion hole 8 in the yoke 7, the front end 7a of the yoke 7 and an end 20a of the tubular section 20 of a dust cover 19 disposed between the housing opening 2 and the yoke 7 are brought into contact with each other to restrict the bolt insertion hole 14 to the predetermined insertion position.

Description

本発明は、ステアリングシャフトのヨークとステアリングギアのギア軸との接続構造に関する。   The present invention relates to a connection structure between a yoke of a steering shaft and a gear shaft of a steering gear.

特開２００９−４０２２３号公報に記載の車両の操舵装置では、ステアリングギアのハウジングから突出したピニオンシャフトと、ステアリングシャフトのジョイントヨークとの組み付け位置を決めるための手段として、ピニオンシャフトに設けた円環状の取付け溝部にピニオンシャフトよりも外径寸法の大きい円環状のプレート部材が取付けられる。また、他の手段として、ピニオンシャフトの一般部分の外形寸法に比して大径となる段部が一体的に形成される。そして、ジョイントヨークの先端部がピニオンシャフトの円環状のプレート部材又は大径の段部に当接する位置まで、ピニオンシャフトをジョイントヨークに挿入することによって、ジョイントヨークに形成された貫通孔と、ピニオンシャフトに形成された環状溝のそれぞれの形成位置が一致した状態になる。この状態で、抜け止めボルトを貫通孔に挿入し環状溝に係合させてジョイントヨークとピニオンシャフトとを連結する。   In the vehicle steering apparatus described in Japanese Patent Application Laid-Open No. 2009-40223, an annular ring provided on the pinion shaft is used as a means for determining an assembly position between the pinion shaft protruding from the steering gear housing and the joint yoke of the steering shaft. An annular plate member having an outer diameter larger than that of the pinion shaft is attached to the attachment groove portion. As another means, a step portion having a larger diameter than that of the general dimension of the general portion of the pinion shaft is integrally formed. Then, by inserting the pinion shaft into the joint yoke until the tip of the joint yoke contacts the annular plate member of the pinion shaft or the large diameter step, the through hole formed in the joint yoke and the pinion The respective formation positions of the annular grooves formed on the shaft are in a state of matching. In this state, the retaining bolt is inserted into the through hole and engaged with the annular groove to connect the joint yoke and the pinion shaft.

特開２００９−４０２２３号公報JP 2009-40223 A

ピニオンシャフトとジョイントヨークとの連結作業において、ピニオンシャフトが収容されるギアハウジングの設置場所等による制約から、抜け止めボルトを挿入するボルト挿通孔の位置とピニオンシャフトの環状溝の位置とを目視によって合わせることが困難な場合がある。この場合に、ボルト挿通孔と環状溝との相互の位置をずらしながらの手探りによる位置合わせを行うと、連結作業に時間を要し、また、連結が不完全な状態で次工程に送られる可能性がある等の問題が生じる。これに対し、上記特許文献１に記載の装置では、ジョイントヨークの先端部を円環状のプレート部材又は大径の段部に当接させることによって、ジョイントヨークとピニオンシャフトとの位置決め及び確認を行うことができる。しかし、ステアリングギア装置のピニオンシャフトは、内部構造上ピニオンシャフト軸を大径にすることが困難であり、またピニオンシャフト軸に別部品を取付けるだけの軸方向の長さの余裕がない場合が多い。従って、上記特許文献１に記載の装置のように、ピニオンシャフト（ギア軸）に一般部分の外形寸法に比して大径となる段部を一体的に形成したり、円環状のプレートなどの別部品を取付けることには実施上の困難が伴うおそれがあり、またコストも上昇する。   When connecting the pinion shaft and the joint yoke, the position of the bolt insertion hole for inserting the retaining bolt and the position of the annular groove of the pinion shaft are visually checked due to restrictions due to the installation location of the gear housing that houses the pinion shaft. It may be difficult to match. In this case, if alignment is performed by groping while shifting the mutual positions of the bolt insertion hole and the annular groove, it takes time for the connection work, and it can be sent to the next process in an incomplete connection state. Problems arise. On the other hand, in the apparatus described in Patent Document 1, the joint yoke and the pinion shaft are positioned and confirmed by bringing the tip of the joint yoke into contact with an annular plate member or a large-diameter stepped portion. be able to. However, it is difficult for the pinion shaft of the steering gear device to increase the diameter of the pinion shaft due to its internal structure, and there is often no allowance for the axial length to attach another part to the pinion shaft. . Therefore, like the device described in Patent Document 1, a stepped portion having a larger diameter than the general dimension of the general portion is integrally formed on the pinion shaft (gear shaft), or an annular plate or the like is formed. Mounting separate parts can be difficult to implement and increases costs.

そこで、本発明は、ギア軸への加工や別部品の追加を必要とすることなく、ギア軸とヨークとの位置決め及び確認作業を極めて容易に行うことが可能なステアリングシャフトの接続構造の提供を目的とする。   Therefore, the present invention provides a steering shaft connection structure capable of extremely easily positioning and confirming the gear shaft and the yoke without the need to process the gear shaft or add another part. Objective.

上記目的を達成すべく、本発明のステアリングシャフトの接続構造は、ギアハウジングと、ギア軸と、係合溝と、ヨークと、ピンチボルトと、ダストカバーとを備えている。ギアハウジングは、ハウジング開口を有し、車体側に固定される。ギア軸は、ギアハウジングに回転自在に支持された状態で収容され、ハウジング開口を挿通してギアハウジングの外側に延びる一端部を有する。係合溝は、ギア軸の一端部の外周面に設けられ環状に形成されている。ヨークは、ギア軸の一端部が挿入されるギア軸挿入孔と、このギア軸挿入孔と交叉する方向に延びてギア軸挿入孔と連通するボルト挿通孔とを有し、ステアリングシャフトの端部に設けられる。ピンチボルトは、係合溝と重なる所定の挿入位置のボルト挿通孔に挿入された状態で締結され、ヨークを締め付けて縮径することによってヨークをギア軸に結合する。ダストカバーは、ギアハウジングとヨークとの間に配置され、ギア軸とハウジング開口との間隙を塞ぐカバー部と、このカバー部からヨークに向かって一体的に突出する筒状部とを有し、この筒状部をギア軸の一端部が挿通した状態でギアハウジング又はギア軸の少なくとも一方に固定される。ヨークと対向するダストカバーの筒状部の一端は、ギア軸の一端部がギア軸挿入孔に挿入される際にヨークと当接してボルト挿通孔を所定の挿入位置に規制する。   In order to achieve the above object, the steering shaft connection structure of the present invention includes a gear housing, a gear shaft, an engagement groove, a yoke, a pinch bolt, and a dust cover. The gear housing has a housing opening and is fixed to the vehicle body side. The gear shaft is housed in a state of being rotatably supported by the gear housing, and has one end portion that extends through the housing opening and extends to the outside of the gear housing. The engagement groove is provided on the outer peripheral surface of one end of the gear shaft and is formed in an annular shape. The yoke has a gear shaft insertion hole into which one end of the gear shaft is inserted, and a bolt insertion hole that extends in a direction crossing the gear shaft insertion hole and communicates with the gear shaft insertion hole. Provided. The pinch bolt is fastened in a state where it is inserted into a bolt insertion hole at a predetermined insertion position that overlaps with the engaging groove, and the yoke is coupled to the gear shaft by tightening the yoke and reducing the diameter. The dust cover is disposed between the gear housing and the yoke, and has a cover portion that closes a gap between the gear shaft and the housing opening, and a cylindrical portion that integrally protrudes from the cover portion toward the yoke, The cylindrical portion is fixed to at least one of the gear housing and the gear shaft in a state where one end portion of the gear shaft is inserted. One end of the cylindrical portion of the dust cover facing the yoke contacts the yoke when the one end portion of the gear shaft is inserted into the gear shaft insertion hole, thereby restricting the bolt insertion hole to a predetermined insertion position.

上記構成では、ギア軸とヨークとを接続する場合、ギア軸の一端部をダストカバーの筒状部に挿通してダストカバーをギア軸上に固定し、ハウジング開口をダストカバーで塞ぐ。次にギア軸の軸方向とヨークのギア軸挿入孔の軸方向と略一致させヨークをダストカバーの方向に移動させてギア軸の一端部をヨークのギア軸挿入孔に挿入する。ヨークに形成されたボルト挿通孔とギア軸に形成された係合溝とが重ならない挿入途中位置においては、ボルト挿通孔とギア軸挿通孔との連通部分をギア軸が塞ぐので、ボルト挿通孔にピンチボルトを挿通することができない。挿入を継続し、ヨークがダストカバーの筒状部の一端に当接した時、ヨークのボルト挿通孔は、ギア軸の係合溝と重なる所定の挿入位置に規制される。従って、ボルト挿通孔からピンチボルトを挿入してヨークと締結し、ヨークを締め付けてヨークを縮径することによってヨークをギア軸に結合することができる。また、ピンチボルトはボルト挿入孔と重なる係合溝を挿通しているので、結合しているギア軸及びヨークに対してギア軸とヨークとを互いに離間する方向に外力が作用した場合であっても、ピンチボルトがギア軸の係合溝に係合し、ギア軸がヨークのギア軸挿入孔から抜けることが防止される。   In the above configuration, when the gear shaft and the yoke are connected, one end of the gear shaft is inserted into the cylindrical portion of the dust cover, the dust cover is fixed on the gear shaft, and the housing opening is closed with the dust cover. Next, the axial direction of the gear shaft and the axial direction of the gear shaft insertion hole of the yoke are made to substantially coincide with each other, the yoke is moved in the direction of the dust cover, and one end of the gear shaft is inserted into the gear shaft insertion hole of the yoke. In the middle of the insertion position where the bolt insertion hole formed in the yoke and the engagement groove formed in the gear shaft do not overlap, the gear shaft closes the communication portion between the bolt insertion hole and the gear shaft insertion hole. It is not possible to insert a pinch bolt. When the insertion is continued and the yoke comes into contact with one end of the cylindrical portion of the dust cover, the bolt insertion hole of the yoke is restricted to a predetermined insertion position overlapping the engagement groove of the gear shaft. Accordingly, the yoke can be coupled to the gear shaft by inserting the pinch bolt from the bolt insertion hole and fastening it to the yoke, and tightening the yoke to reduce the diameter of the yoke. In addition, since the pinch bolt is inserted through the engaging groove that overlaps the bolt insertion hole, an external force is applied to the coupled gear shaft and yoke in a direction separating the gear shaft and the yoke from each other. In addition, the pinch bolt is engaged with the engagement groove of the gear shaft, and the gear shaft is prevented from coming out of the gear shaft insertion hole of the yoke.

このように、ギア軸の一端部が挿入されたヨークを、ダストカバーの筒状部の一端と当接するまでギア軸に沿ってダストカバーの方向に移動させるという極めて簡単な作業によってギア軸とヨークとの接続の位置合わせが可能となる。従って、ギア軸とヨークとの相互の位置をずらしながら手探りで位置合わせするなどの煩雑な作業が不要となり、ギア軸とヨークとの接続作業の作業性が格段に向上し、作業時間が大幅に短縮される。また、ダストカバーの筒状部とヨークとの当接状態は外部から容易に視認できるので、接続作業後にギア軸とヨークとが正しく接続されたか否かの確認が可能となり、接続が不完全な状態で次工程に送られるおそれも解消される。また、既存のダストカバーを利用しておりギア軸への加工や、新たな部品の追加を必要としないので、発明の実施に困難を伴わずまたコストの上昇を招かない。   Thus, the gear shaft and the yoke are moved by a very simple operation of moving the yoke, into which the one end of the gear shaft is inserted, in the direction of the dust cover along the gear shaft until it contacts the one end of the cylindrical portion of the dust cover. It is possible to align the position of the connection. This eliminates the need for complicated operations such as locating the gear shaft and the yoke by shifting the mutual positions, greatly improving the workability of the connection between the gear shaft and the yoke, and greatly increasing the work time. Shortened. In addition, since the contact state between the cylindrical portion of the dust cover and the yoke can be easily seen from the outside, it is possible to check whether the gear shaft and the yoke are correctly connected after the connection work, and the connection is incomplete. The possibility of being sent to the next process in a state is also eliminated. Further, since an existing dust cover is used and processing to the gear shaft and addition of new parts are not required, the present invention is not difficult to implement and the cost is not increased.

本発明によれば、ギア軸への加工や別部品の追加を必要とすることなく、ギア軸とヨークとの位置決め及び確認作業を極めて容易に行うことができる。   According to the present invention, positioning and checking work between the gear shaft and the yoke can be performed very easily without the need to process the gear shaft or add another part.

本実施形態に係わるヨークとダストカバーの筒状部の一端との当接状態を示す断面図である。It is sectional drawing which shows the contact state of the yoke concerning this embodiment, and the end of the cylindrical part of a dust cover. 図１においてピンチボルトを挿通した状態の外観図である。It is an external view of the state which inserted the pinch volt | bolt in FIG. 図２のＩＩＩ−ＩＩＩ矢視断面図である。FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. ステアリング装置を示す外観斜視図である。It is an external appearance perspective view which shows a steering device.

以下、本発明の一実施形態を、図面に基づいて説明する。図４は、本実施形態に係わるステアリングシャフトの接続構造が用いられるステアリング装置２２である。運転者の操作するステアリングホイール２３の回転運動は、ステアリングシャフト２４を経由してピニオン軸３に伝達され、ギアハウジング１に収容されたラックアンドピニオン機構（図示省略）によってピニオン軸の回転運動がラック軸の直線運動に変換されて、ラック軸２５の両端部に結合したタイロッド２６を押し引きし、図示しない操舵輪に所望の舵角を付与する。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 4 shows a steering device 22 in which the steering shaft connection structure according to this embodiment is used. The rotational motion of the steering wheel 23 operated by the driver is transmitted to the pinion shaft 3 via the steering shaft 24, and the rotational motion of the pinion shaft is racked by a rack and pinion mechanism (not shown) housed in the gear housing 1. The tie rod 26 that is converted into the linear motion of the shaft and coupled to both ends of the rack shaft 25 is pushed and pulled to give a desired steering angle to a steered wheel (not shown).

図１及び図２に示すように、本実施形態のステアリングシャフト２４の接続構造は、ギアハウジング１とピニオン軸（ギア軸）３とヨーク７とピンチボルト１７とダストカバー１８等とから構成されている。   As shown in FIGS. 1 and 2, the connection structure of the steering shaft 24 according to this embodiment includes a gear housing 1, a pinion shaft (gear shaft) 3, a yoke 7, a pinch bolt 17, a dust cover 18, and the like. Yes.

ギアハウジング１は図示しない車体側に固定され、ラックアンドピニオン機構を収容しピニオン軸３を回転自在に支持している。   The gear housing 1 is fixed to a vehicle body (not shown), accommodates a rack and pinion mechanism, and rotatably supports the pinion shaft 3.

ピニオン軸３の一方の軸端部（一端部）３ａは、図１に示すように、ギアハウジング１のハウジング開口２を挿通してギアハウジング１の外側に延びている。ピニオン軸３の軸端部３ａは、一対の雄セレーション部４を有し、一対の雄セレーション４の間には一対の雄セレーション部４の外径よりも小さい外径を有する環状の係合溝５が形成されている。一対の雄セレーション部４には、それぞれピニオン軸３の軸方向に沿って延びるセレーション歯が軸の全周に亘って形成されている。また、ピニオン軸３のセレーション部４とハウジング開口２との間の外周面には、ダストカバー１８を固定するための環状の係合凹部６が形成されている。   As shown in FIG. 1, one shaft end (one end) 3 a of the pinion shaft 3 is inserted through the housing opening 2 of the gear housing 1 and extends to the outside of the gear housing 1. The shaft end portion 3 a of the pinion shaft 3 has a pair of male serration portions 4, and an annular engagement groove having an outer diameter smaller than the outer diameter of the pair of male serration portions 4 between the pair of male serrations 4. 5 is formed. In the pair of male serration portions 4, serration teeth extending along the axial direction of the pinion shaft 3 are formed over the entire circumference of the shaft. An annular engaging recess 6 for fixing the dust cover 18 is formed on the outer peripheral surface between the serration portion 4 of the pinion shaft 3 and the housing opening 2.

ヨーク７は、図４に示すように、ステアリングシャフト２４の下端部に設けられている。ヨーク７は、図１〜図３に示すように、ギア軸挿入孔８とボルト挿通孔１４とを有する。ギア軸挿入孔８は、ピニオン軸３が挿入される断面円弧状の挿入部９と挿入部９の両端から径方向外側に延びて対向する一対のタブ部１２とを有する。一対のタブ部１２の間にはヨーク７の軸方向に貫通するスリット１３が形成されている。挿入部９の内面は、軸方向に沿って延びる雌セレーション歯が形成された雌セレーション部１１を有する。雌セレーション部１１は、ピニオン軸３の一対の雄セレーション部４と嵌合する。一対のタブ部１２にはボルト挿通孔１４が形成されており、一方のタブ１２ａにはボルトの貫通孔１４が、他方のタブ１２ｂにはネジ孔１６が形成されている。図３に示すように、ボルト挿通孔１４はギア軸挿入孔８と交叉する方向に設けられ、ギア軸挿入孔８と連通している。   The yoke 7 is provided at the lower end of the steering shaft 24 as shown in FIG. As shown in FIGS. 1 to 3, the yoke 7 has a gear shaft insertion hole 8 and a bolt insertion hole 14. The gear shaft insertion hole 8 includes an insertion portion 9 having an arcuate cross section in which the pinion shaft 3 is inserted and a pair of tab portions 12 that extend radially outward from both ends of the insertion portion 9 and face each other. A slit 13 penetrating in the axial direction of the yoke 7 is formed between the pair of tab portions 12. The inner surface of the insertion portion 9 has a female serration portion 11 in which female serration teeth extending along the axial direction are formed. The female serration portion 11 is fitted with the pair of male serration portions 4 of the pinion shaft 3. Bolt insertion holes 14 are formed in the pair of tab portions 12, bolt through holes 14 are formed in one tab 12a, and screw holes 16 are formed in the other tab 12b. As shown in FIG. 3, the bolt insertion hole 14 is provided in a direction crossing the gear shaft insertion hole 8 and communicates with the gear shaft insertion hole 8.

ピンチボルト１７は、頭部１７ａと円柱部１７ｂとネジ部１７ｃを一体的に有し、図２及び図３に示すように、ボルト挿通孔１４の貫通孔１５側からボルト挿通孔１４に挿入され、頭部１７ａがタブ１２ａに支持され、円柱部１７ｂがピニオン軸３の係合溝５を挿通し、ネジ部１７ｃがボルト挿通孔１４のネジ孔１６と螺合してヨーク７に締結される。ピンチボルト１７に所定の締め付けトルクを付与しギア軸挿入孔８のスリット１３の間隙を狭めることによって、ギア軸挿入孔８の雌セレーション部１１とピニオン軸３の一対の雄セレーション部４とが堅固に嵌合し、ヨーク７とピニオン軸３とは、ステアリングホイールの回転運動によって生じた操舵力を伝達可能に結合される。また、ピンチボルト１７の円柱部１７ｂがピニオン軸３の係合溝５を挿通しているので、結合しているピニオン軸３及びヨーク７に対してピニオン軸３とヨーク７とを互いに離間する方向に外力が作用した場合であっても、ピンチボルト１７がピニオン軸３の係合溝５に係合し、ピニオン軸３がヨーク７のギア軸挿入孔８から抜けることが防止される（図２、図３参照）。   The pinch bolt 17 integrally includes a head portion 17a, a cylindrical portion 17b, and a screw portion 17c, and is inserted into the bolt insertion hole 14 from the through hole 15 side of the bolt insertion hole 14, as shown in FIGS. The head portion 17a is supported by the tab 12a, the cylindrical portion 17b is inserted through the engaging groove 5 of the pinion shaft 3, and the screw portion 17c is screwed into the screw hole 16 of the bolt insertion hole 14 and fastened to the yoke 7. . By applying a predetermined tightening torque to the pinch bolt 17 and narrowing the gap of the slit 13 of the gear shaft insertion hole 8, the female serration portion 11 of the gear shaft insertion hole 8 and the pair of male serration portions 4 of the pinion shaft 3 are firmly fixed. The yoke 7 and the pinion shaft 3 are coupled so as to be able to transmit a steering force generated by the rotational motion of the steering wheel. Further, since the cylindrical portion 17b of the pinch bolt 17 passes through the engaging groove 5 of the pinion shaft 3, the direction in which the pinion shaft 3 and the yoke 7 are separated from each other with respect to the pinion shaft 3 and the yoke 7 that are coupled to each other. Even when an external force is applied to the pinion bolt 17, the pinch bolt 17 is engaged with the engagement groove 5 of the pinion shaft 3, and the pinion shaft 3 is prevented from coming out of the gear shaft insertion hole 8 of the yoke 7 (FIG. 2). FIG. 3).

ダストカバー１８は、図１及び図２に示すようにギアハウジング１とヨーク７との間に配置される。ダストカバー１８は、例えば、ゴム等の合成樹脂素材から形成され、カバー部１９と筒状部２０とを一体的に有しており、カバー部１９は、ピニオン軸３とハウジング開口２との間隙を塞いで外部からハウジング開口２への異物の侵入を防止する。カバー部１９からヨーク７側に突出する筒状部２０には、ピニオン軸３の軸端部３ａが挿通している。筒状部２０の内周面には環状の係合凸部２１が形成されており、ピニオン軸３に設けた係合凹部６と係合することによって、ダストカバー１８をピニオン軸３上の所定の位置に固定する。筒状部２０のヨーク７と対向する端部２０ａ（筒状部の一端）の位置は、ピニオン軸３の軸端部３ａがギア軸挿入孔８に挿入されてヨーク７の端部７ａが筒状部２０の端部２０ａに当接した時、ヨーク７のボルト挿通孔１４とピニオン軸３の係合溝５とが重なる所定の挿入位置となる位置に設定されている。   As shown in FIGS. 1 and 2, the dust cover 18 is disposed between the gear housing 1 and the yoke 7. The dust cover 18 is formed of, for example, a synthetic resin material such as rubber, and integrally includes a cover portion 19 and a cylindrical portion 20, and the cover portion 19 is a gap between the pinion shaft 3 and the housing opening 2. To prevent foreign matter from entering the housing opening 2 from the outside. A shaft end portion 3a of the pinion shaft 3 is inserted through the cylindrical portion 20 protruding from the cover portion 19 toward the yoke 7 side. An annular engaging convex portion 21 is formed on the inner peripheral surface of the cylindrical portion 20, and the dust cover 18 is fixed to the predetermined pinion shaft 3 by engaging with the engaging concave portion 6 provided on the pinion shaft 3. Fix in position. The position of the end portion 20a (one end of the cylindrical portion) of the cylindrical portion 20 facing the yoke 7 is such that the shaft end portion 3a of the pinion shaft 3 is inserted into the gear shaft insertion hole 8 and the end portion 7a of the yoke 7 is cylindrical. When abutting against the end 20a of the shaped portion 20, the bolt insertion hole 14 of the yoke 7 and the engagement groove 5 of the pinion shaft 3 are set at a predetermined insertion position.

本実施形態では、ピニオン軸３とヨーク７とを接続する場合は、先ず、ピニオン軸３にダストカバー１８の筒状部２０を挿通し、筒状部２０の内周面の係合凸部２１をピニオン軸３の係合凹部６に係合させてダストカバー１８をピニオン軸３に固定し、ギアハウジング１のハウジング開口２をダストカバー１８で塞ぐ。次に、ピニオン軸３の軸端部３ａの一対の雄セレーション部４とヨーク７のギア軸挿入孔８の内面の雌セレーション部１１とを歯合させ、ヨーク７をピニオン軸３の軸方向に沿ってダストカバー１８の方向に移動させることによってピニオン軸３の軸端部３ａをヨーク７のギア軸挿入孔８に挿入する。ここで、ヨーク７のボルト挿通孔１４とピニオン軸３の係合溝５とが重ならない挿入途中位置においては、ボルト挿通孔１４とギア軸挿通孔８との連通部分をピニオン軸３が塞ぐので、ボルト挿通孔１４にピンチボルト１７を挿通することができない。挿入を継続し、ヨーク７の先端部７ａがダストカバー１８の筒状部２０の端部２０ａに当接した時、ヨーク７のボルト挿通孔１４の位置は筒状部２０の端部２０ａによってピニオン軸３の係合溝５と重なる所定の挿入位置に規制される（図１参照）。そこで、ピンチボルト１７をヨーク７のボルト挿通孔１４から挿入してピニオン軸３の軸端部３ａの係合溝５を挿通し、ピンチボルト１７のネジ部１７ｃをボルト挿通孔１４のネジ孔１６に螺合させて所定の締め付けトルクで締め付け、ピンチボルト１７をヨーク７に締結する。ピンチボルト１７のヨーク７への締結により、ヨーク７のスリット１３が狭まり、ヨーク７のギア軸挿入孔８の雌セレーション部１１が縮径してピニオン軸３の一対の雄セレーション部４とヨーク７の雌セレーション部１１との嵌合が堅固となり、ヨーク７とピニオン軸３とがテアリングホイール２３の回転で発生した操舵力を伝達可能に結合する。また、ピンチボルト１７の円柱部１７ｂがピニオン軸３の軸端部３ａの係合凹部を挿通しているので、ヨーク７のギア軸挿入孔８からのピニオン軸３の抜けが防止される（図２、図３参照）。   In the present embodiment, when the pinion shaft 3 and the yoke 7 are connected, first, the tubular portion 20 of the dust cover 18 is inserted into the pinion shaft 3, and the engaging convex portion 21 on the inner peripheral surface of the tubular portion 20. Is engaged with the engaging recess 6 of the pinion shaft 3 to fix the dust cover 18 to the pinion shaft 3, and the housing opening 2 of the gear housing 1 is closed with the dust cover 18. Next, the pair of male serrations 4 of the shaft end 3 a of the pinion shaft 3 and the female serrations 11 on the inner surface of the gear shaft insertion hole 8 of the yoke 7 are engaged with each other, and the yoke 7 is moved in the axial direction of the pinion shaft 3. The shaft end 3 a of the pinion shaft 3 is inserted into the gear shaft insertion hole 8 of the yoke 7 by moving along the direction of the dust cover 18. Here, at the midway position where the bolt insertion hole 14 of the yoke 7 and the engagement groove 5 of the pinion shaft 3 do not overlap, the pinion shaft 3 closes the communication portion between the bolt insertion hole 14 and the gear shaft insertion hole 8. The pinch bolt 17 cannot be inserted into the bolt insertion hole 14. When the insertion is continued and the tip 7a of the yoke 7 comes into contact with the end 20a of the cylindrical portion 20 of the dust cover 18, the position of the bolt insertion hole 14 of the yoke 7 is pinned by the end 20a of the cylindrical portion 20. It is restricted to a predetermined insertion position that overlaps with the engagement groove 5 of the shaft 3 (see FIG. 1). Therefore, the pinch bolt 17 is inserted from the bolt insertion hole 14 of the yoke 7 to pass through the engaging groove 5 of the shaft end portion 3 a of the pinion shaft 3, and the screw portion 17 c of the pinch bolt 17 is inserted into the screw hole 16 of the bolt insertion hole 14. And the pinch bolt 17 is fastened to the yoke 7 with a predetermined tightening torque. By fastening the pinch bolt 17 to the yoke 7, the slit 13 of the yoke 7 is narrowed, the female serration portion 11 of the gear shaft insertion hole 8 of the yoke 7 is reduced in diameter, and the pair of male serration portions 4 of the pinion shaft 3 and the yoke 7. The female serration portion 11 is firmly fitted, and the yoke 7 and the pinion shaft 3 are coupled so that the steering force generated by the rotation of the tearing wheel 23 can be transmitted. Further, since the cylindrical portion 17b of the pinch bolt 17 is inserted through the engaging recess of the shaft end portion 3a of the pinion shaft 3, the pinion shaft 3 is prevented from coming off from the gear shaft insertion hole 8 of the yoke 7 (FIG. 2, see FIG.

このように、ピニオン軸３の軸端部３ａをヨーク７のギア軸挿入孔８に挿入する際、ヨーク７の先端部７ａがダストカバー１８の筒状部２０の端部２０ａと当接するまでヨーク７をピニオン軸３に沿ってダストカバー１８の方向に移動させるという極めて簡単な作業でピニオン軸３とヨーク７との結合位置の位置合わせが可能となる。従って、ピニオン軸３とヨーク７との相互の位置をずらしながら手探りで調整するなどの煩雑な作業が不要となり、ピニオン軸３とヨーク７との接続作業の作業性が格段に向上し、作業時間を大幅に短縮できる。また、ダストカバー１８の筒状部２０とヨーク７との当接状態は、図２に示すように外部から容易に視認できるので、接続作業後に、ピニオン軸３とヨーク７とが正しく結合されたか否かの確認が可能となり、ステアリングシャフトの接続が不完全な状態で次工程に送られるおそれも解消される。また、既存のダストカバー１８を利用しており、ピニオン軸への加工や、新たな部品の追加を必要としないので、発明の実施に困難を伴わずまたコストの上昇を招かない。   Thus, when the shaft end portion 3 a of the pinion shaft 3 is inserted into the gear shaft insertion hole 8 of the yoke 7, the yoke 7 is moved until the tip portion 7 a of the yoke 7 contacts the end portion 20 a of the cylindrical portion 20 of the dust cover 18. The coupling position of the pinion shaft 3 and the yoke 7 can be aligned by an extremely simple operation of moving the 7 along the pinion shaft 3 toward the dust cover 18. This eliminates the need for complicated work such as adjusting the position of the pinion shaft 3 and the yoke 7 by shifting the position of the pinion shaft 3 and the yoke 7, greatly improving the workability of the connection work between the pinion shaft 3 and the yoke 7, and the working time. Can be greatly shortened. Further, since the contact state between the cylindrical portion 20 of the dust cover 18 and the yoke 7 can be easily visually recognized from the outside as shown in FIG. 2, is the pinion shaft 3 and the yoke 7 properly connected after the connection work? It is possible to confirm whether or not the steering shaft is incompletely connected, and the possibility of being sent to the next process is also eliminated. Further, since the existing dust cover 18 is used and processing to the pinion shaft and addition of new parts are not required, the present invention is not difficult to implement and the cost is not increased.

なお、ダストカバー１８のピニオン軸３への固定は、本実施形態に限定されず、例えばピニオン軸３側に係合凸部を設け、ダストカバー１８の筒状部２０の内面に係合凹部を設けてもよい。また、ダストカバー１８は、ダストハウジング１側に固定されてもよい。   The fixing of the dust cover 18 to the pinion shaft 3 is not limited to this embodiment. For example, an engagement convex portion is provided on the pinion shaft 3 side, and the engagement concave portion is provided on the inner surface of the cylindrical portion 20 of the dust cover 18. It may be provided. The dust cover 18 may be fixed to the dust housing 1 side.

また、本実施形態では、ラックアンドピニオン機構のピニオン軸３とステアリングシャフト２４のヨーク７との接続を示したが、これらに限定されることはなく、例えばボールネジ機構であってもよい。   In the present embodiment, the connection between the pinion shaft 3 of the rack and pinion mechanism and the yoke 7 of the steering shaft 24 is shown, but the present invention is not limited to this, and a ball screw mechanism, for example, may be used.

以上、本発明者によってなされた発明を適用した実施形態について説明したが、この実施形態による本発明の開示の一部をなす論述及び図面により本発明は限定されることはない。すなわち、この実施形態に基づいて当業者等によりなされる他の実施形態、実施例及び運用技術等は全て本発明の範疇に含まれることは勿論である。   As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

本発明は、ダストカバーを有するギアハウジングのギア軸とステアリングシャフトとの接続に広く適用可能である。   The present invention is widely applicable to the connection between a gear shaft of a gear housing having a dust cover and a steering shaft.

１ ギアハウジング
２ ハウジング開口
３ ピニオン軸（ギア軸）
３ａ 軸端部（ギア軸の一端部）
５ 係合溝
７ ヨーク
８ ギア挿入孔
１４ ボルト挿通孔
１７ ピンチボルト
１８ ダストカバー
１９ カバー部
２０ 筒状部
２０ａ 端部（筒状部の一端）
２４ ステアリングシャフト 1 Gear housing 2 Housing opening 3 Pinion shaft (gear shaft)
3a Shaft end (one end of gear shaft)
5 engagement groove 7 yoke 8 gear insertion hole 14 bolt insertion hole 17 pinch bolt 18 dust cover 19 cover part 20 cylindrical part 20a end part (one end of the cylindrical part)
24 Steering shaft

Claims (1)

ハウジング開口を有し、車体側に固定されるギアハウジングと、
前記ギアハウジングに回転自在に支持された状態で収容され、前記ハウジング開口を挿通して前記ギアハウジングの外側に延びる一端部を有するギア軸と、
前記ギア軸の一端部の外周面に設けられた環状の係合溝と、
前記ギア軸の一端部が挿入されるギア軸挿入孔と、このギア軸挿入孔と交叉する方向に延びて該ギア軸挿入孔と連通するボルト挿通孔とを有し、ステアリングシャフトの端部に設けられるヨークと、
前記係合溝と重なる所定の挿入位置の前記ボルト挿通孔に挿入された状態で締結され、前記ヨークを締め付けて縮径することによって前記ヨークを前記ギア軸に結合するピンチボルトと、
前記ギアハウジングと前記ヨークとの間に配置され、前記ギア軸と前記ハウジング開口との間隙を塞ぐカバー部と、このカバー部から前記ヨークに向かって一体的に突出する筒状部とを有し、この筒状部を前記ギア軸の一端部が挿通した状態で前記ギアハウジング又は前記ギア軸の少なくとも一方に固定されるダストカバーと、を備え、
前記ヨークと対向する前記ダストカバーの筒状部の一端は、前記ギア軸の一端部が前記ギア軸挿入孔に挿入される際に前記ヨークと当接して前記ボルト挿通孔を前記所定の挿入位置に規制する
ことを特徴とするステアリングシャフトの接続構造。 A gear housing having a housing opening and fixed to the vehicle body side;
A gear shaft that is housed in a state of being rotatably supported by the gear housing, and has an end portion that extends through the housing opening and extends to the outside of the gear housing;
An annular engagement groove provided on the outer peripheral surface of one end of the gear shaft;
A gear shaft insertion hole into which one end portion of the gear shaft is inserted, and a bolt insertion hole extending in a direction intersecting with the gear shaft insertion hole and communicating with the gear shaft insertion hole. A provided yoke;
A pinch bolt that is fastened in a state of being inserted into the bolt insertion hole at a predetermined insertion position that overlaps with the engagement groove, and that couples the yoke to the gear shaft by tightening and reducing the diameter of the yoke;
A cover portion disposed between the gear housing and the yoke and closing a gap between the gear shaft and the housing opening; and a cylindrical portion integrally projecting from the cover portion toward the yoke. A dust cover fixed to at least one of the gear housing or the gear shaft in a state where one end portion of the gear shaft is inserted through the cylindrical portion,
One end of the cylindrical portion of the dust cover facing the yoke contacts the yoke when the one end of the gear shaft is inserted into the gear shaft insertion hole, and the bolt insertion hole is set to the predetermined insertion position. Steering shaft connection structure, characterized in that
JP2011207581A 2011-09-22 2011-09-22 Steering shaft connection structure Pending JP2013067280A (en)

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PCT/JP2012/074067 WO2013042728A1 (en) 2011-09-22 2012-09-20 Steering shaft connection structure

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Publication number Priority date Publication date Assignee Title
DE102017106669A1 (en) 2016-03-28 2017-09-28 Fukoku Bussan Co., Ltd. Dust cover, steering device and damper

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JP5796410B2 (en) * 2011-08-24 2015-10-21 株式会社ジェイテクト Connecting structure and steering device

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