JP5029425B2 - Fastening structure of universal joint yoke and shaft - Google Patents

Fastening structure of universal joint yoke and shaft Download PDF

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Publication number
JP5029425B2
JP5029425B2 JP2008048191A JP2008048191A JP5029425B2 JP 5029425 B2 JP5029425 B2 JP 5029425B2 JP 2008048191 A JP2008048191 A JP 2008048191A JP 2008048191 A JP2008048191 A JP 2008048191A JP 5029425 B2 JP5029425 B2 JP 5029425B2
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Prior art keywords
shaft
fastening
universal joint
yoke
bolt
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JP2009204110A (en
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知行 菊田
高之 吉田
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NSK Ltd
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NSK Ltd
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    • 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
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
    • F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
    • F16D3/382—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another constructional details of other than the intermediate member
    • F16D3/387—Fork construction; Mounting of fork on shaft; Adapting shaft for mounting of fork
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Steering Controls (AREA)
  • Power Steering Mechanism (AREA)

Description

本発明は、自在継手のヨークでシャフトを抱き締めるようにした自在継手のヨークとシャフトとの締結構造に関する。   The present invention relates to a fastening structure between a universal joint yoke and a shaft, which is configured to hug a shaft by the universal joint yoke.

この種の自在継手のヨークとシャフトとの締結構造としては、例えば特許文献１に記載されている構成が知られている。すなわち、自在継手のヨークのシャフト係合部の相対向する一対の挟持板間に、シャフトの先端部を組み入れ、このシャフトの先端部の挟持板に対応する挟持面に逃げ凹部を堀り込み形成することにより、締付軸とナットとの螺合によって一対の挟持板を締付けたときに、一対の挟持板の一部を逃げ凹部の縁部に食い込ませてシャフトとヨークとの結合力を高めるようにしている。
特開２００５−４２７６０号公報 As a fastening structure between this type of universal joint yoke and shaft, for example, a configuration described in Patent Document 1 is known. That is, the shaft tip portion is incorporated between a pair of opposing clamping plates of the universal joint yoke shaft engagement portion, and a relief recess is dug into the clamping surface corresponding to the clamping plate at the shaft tip portion. By doing so, when the pair of clamping plates are tightened by screwing the fastening shaft and the nut, a part of the pair of clamping plates is bitten into the edge of the recess and the coupling force between the shaft and the yoke is increased. I am doing so.
JP 2005-42760 A

しかしながら、上記特許文献１に記載の従来例にあっては、締付軸とナットとの螺合によって一対の挟持板を締付けたときに、一対の挟持板の一部を逃げ凹部の縁部に食い込ませるようにしているので、シャフトとヨークとの結合力を高めることはできるが、実際には、一対の挟持板を締付軸とナットとの螺合により締付けたときに、挟持板の逃げ凹部に対向する一部は逃げ凹部に食い込むが逃げ凹部の回りの挟持板は逆に反ってしまうことになり、一対の挟持板とシャフトとの間の接触が部分的となり、長期の使用によって部分接触部が摩耗してガタが発生するという未解決の課題がある。   However, in the conventional example described in Patent Document 1, when the pair of clamping plates are tightened by screwing the fastening shaft and the nut, a part of the pair of clamping plates is used as the edge of the relief recess. However, in reality, when the pair of clamping plates are tightened by screwing between the clamping shaft and the nut, the clamping plate escapes. The part facing the recess will bite into the escape recess, but the clamping plate around the escape recess will be warped in reverse, and the contact between the pair of clamping plates and the shaft will become partial, and part due to long-term use There is an unsolved problem that the contact portion is worn and loose.

そこで、本発明は、上記従来例の未解決の課題に着目してなされたものであり、一対の締付板部間にシャフトを挟んで、一対の締付板部を締付けたときに、一対の締付板部とシャフトとの保持力を向上させて、一対締付板部とシャフトとを確実に締結するようにした自在継手のヨークとシャフトとの締結構造を提供することを目的としている。   Therefore, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and when a pair of clamping plate portions are clamped with a shaft sandwiched between the pair of clamping plate portions, It is an object of the present invention to provide a fastening structure between a universal joint yoke and a shaft in which the holding force between the fastening plate portion and the shaft is improved and the pair of fastening plate portions and the shaft are securely fastened. .

上記目的を達成するために、請求項１に係る自在継手のヨークとシャフトとの締結構造は、シャフトと、該シャフトを抱き締める自在継手のヨークとを備えた自在継手のヨークとシャフトとの締結構造であって、前記ヨークは前記シャフトを抱き締める一対の締付板部とこれら締付板部を連結する連結板部とからＵ字状に形成された連結部と、該連結部の締付板部から突出して十字軸を支持するアーム部と、前記連結部の一対の締付板部間に橋架されて前記シャフトを締付ける締付ボルトとを備え、前記締付板部の内面の前記締付ボルトを挿通するボルト挿通部の近傍における前記シャフトとの接触面に凹部を形成し、前記一対の締付板部間の間隔及びシャフトの幅を、前記凹部より前記アーム部側に比較して前記凹部よりアーム部とは反対側を広く設定したことを特徴としている。 To achieve the above object, a universal joint yoke and shaft fastening structure according to claim 1 is a universal joint yoke and shaft fastening structure comprising a shaft and a universal joint yoke for holding the shaft. The yoke includes a U-shaped connecting portion formed from a pair of fastening plate portions for hugging the shaft, a connecting plate portion for connecting the fastening plate portions, and a fastening plate portion for the connecting portion. And a fastening bolt that is bridged between a pair of fastening plate portions of the connecting portion and fastens the shaft, the fastening bolt on the inner surface of the fastening plate portion A recess is formed in the contact surface with the shaft in the vicinity of the bolt insertion portion through which the recess is inserted, and the interval between the pair of fastening plate portions and the width of the shaft are compared with the arm portion side from the recess. More opposite to the arm It is characterized in that the wide setting.

また、請求項２に係る自在継手のヨークとシャフトとの締結構造は、請求項１に係る発明において、記凹部は、少なくとも一方の前記締付板部のボルト挿通部と前記連結板部との間に形成されていることを特徴としている。
さらに、請求項３に係る自在継手のヨークとシャフトとの締結構造は、請求項１に係る発明において、前記凹部は、少なくとも一方の前記締付板部のボルト挿通部近傍から前記アーム部とは反対側の端面まで延長されていることを特徴としている。 According to a second aspect of the present invention, there is provided the fastening structure between the yoke and the shaft of the universal joint according to the first aspect, wherein the concave portion is formed by the bolt insertion portion and the connecting plate portion of at least one of the fastening plate portions. It is characterized by being formed between.
Furthermore, the fastening structure between the yoke and the shaft of the universal joint according to claim 3 is the invention according to claim 1, wherein the concave portion is separated from the vicinity of the bolt insertion portion of at least one of the fastening plate portions from the arm portion. It is characterized by extending to the opposite end face.

さらにまた、請求項４に係る自在継手のヨークとシャフトとの締結構造は、請求項１に係る発明において、前記凹部は、前記締付板部の一方のボルト挿通部近傍から前記連結板部を経て他方の締付板部のボルト挿通部近傍までの間に形成されていることを特徴としている。 Furthermore, the fastening structure between the yoke and the shaft of the universal joint according to claim 4 is the invention according to claim 1, wherein the concave portion is formed by connecting the connecting plate portion from the vicinity of one bolt insertion portion of the fastening plate portion. after it it is characterized by being formed until bolt insertion portion near the other clamping plate portion.

また、請求項５に係る自在継手のヨークとシャフトとの締結構造は、請求項１乃至４の何れか１つに係る発明において、前記シャフトは、締付板部によって抱き締められる位置に二面幅が形成され、該二面幅の表面に微細な凹凸形状が形成されていることを特徴としている。 According to a fifth aspect of the present invention, there is provided the fastening structure between the yoke and the shaft of the universal joint according to any one of the first to fourth aspects, wherein the shaft is positioned at a position where the shaft is clamped by the fastening plate portion. Is formed, and a fine concavo-convex shape is formed on the surface of the two-sided width .

本発明によれば、一対の締付板部の少なくとも一方における締付ボルトを挿通するボルト挿通部の近傍における前記シャフトとの接触面に凹部を形成したので、締付ボルトによる締付板部の締付け時に締付板部とシャフトとの保持力が向上することにより、締付板部とシャフトとの締結を確実に行なうことができるという効果が得られる。
ここで、シャフトの締付板部との対向位置に二面幅を形成し、その二面幅の接触面にローレット、ショットピーニング等の手段で微細な凹凸を形成することにより、二面幅と一対の締付板部とが接触したときに、より保持力を向上させて確実な締結を行なうことができる。 According to the present invention, since the concave portion is formed in the contact surface with the shaft in the vicinity of the bolt insertion portion through which the tightening bolt is inserted in at least one of the pair of tightening plate portions, By improving the holding force between the tightening plate portion and the shaft at the time of tightening, an effect that the tightening plate portion and the shaft can be securely fastened can be obtained.
Here, by forming a two-sided width at a position facing the clamping plate portion of the shaft, and by forming fine irregularities on the two-sided contact surface by means of knurling, shot peening, etc., the two-sided width and When the pair of fastening plate portions come into contact with each other, the holding force can be further improved and reliable fastening can be performed.

また、一対の締付板部間の間隔が前記凹部より前記アーム部側の間隔に比較して前記凹部よりアーム部とは反対側の間隔が広く設定することにより、シャフトとヨークとの位置決めを正確に行なうことができる。   In addition, the distance between the pair of fastening plate portions is set so that the space on the side opposite to the arm portion from the recess is wider than the space on the arm portion side from the recess, thereby positioning the shaft and the yoke. Can be done accurately.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は本発明を電動パワーステアリング装置に適用した場合の全体構成図、図２は本発明の一実施形態を示す自在継手のヨークとシャフトとの分解斜視図、図３はヨーク及びシャフトの締結状態を示す平面図、図４はヨークの側面図、図５は図４のＡ−Ａ線上の断面図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is an overall configuration diagram when the present invention is applied to an electric power steering apparatus, FIG. 2 is an exploded perspective view of a yoke and a shaft of a universal joint showing an embodiment of the present invention, and FIG. 3 is a fastening of the yoke and the shaft. FIG. 4 is a side view of the yoke, and FIG. 5 is a cross-sectional view taken along the line AA of FIG.

図１において、２は車両後端（図１において右端）側にステアリングホイール１を装着したステアリングシャフトであって、このステアリングシャフト２がステアリングコラム３に回転自在に支持されている。ステアリングシャフト２の車両前端（図１において左側）には、ステアリングシャフト２に操舵補助トルクを付与するウォーム減速機１１と、このウォーム減速機１１に結合されて操舵補助トルクを発生する電動モータ１２とで構成される操舵補助機構４が連結されている。   In FIG. 1, reference numeral 2 denotes a steering shaft having a steering wheel 1 mounted on the vehicle rear end (right end in FIG. 1). The steering shaft 2 is rotatably supported by a steering column 3. At the vehicle front end (left side in FIG. 1) of the steering shaft 2, a worm speed reducer 11 that applies a steering assist torque to the steering shaft 2, and an electric motor 12 that is coupled to the worm speed reducer 11 and generates a steering assist torque. The steering assist mechanism 4 comprised by these is connected.

ウォーム減速機１１の出力軸１４には、自在継手１７Ａを介して中間シャフト１８が連結され、この中間シャフト１８が自在継手１７Ｂを介してラックピニオン式のステアリングギア機構６のピニオン軸１９に連結されている。
このステアリングギア機構６のラック軸（図示せず）は、タイロッド５を介して図示しない転舵輪に連結されている。 An intermediate shaft 18 is connected to the output shaft 14 of the worm reducer 11 via a universal joint 17A, and this intermediate shaft 18 is connected to a pinion shaft 19 of the rack and pinion type steering gear mechanism 6 via a universal joint 17B. ing.
A rack shaft (not shown) of the steering gear mechanism 6 is connected to a steered wheel (not shown) via a tie rod 5.

ここで、ステアリングシャフト２は、アウタシャフト７とインナシャフト８とを有し、アウタシャフト７の前端部とインナシャフト８の後端部とをスプライン結合させると共に、合成樹脂８ａを介して結合される。したがって、アウタシャフト７とインナシャフト８とは、衝突時に上記合成樹脂８ａを破断させて、全長を縮めることができる。
また、ステアリングシャフト２を挿通した筒状のステアリングコラム３は、アウタコラム９とインナコラム１０とをテレスコープ状に組み合わせてなり、軸方向向きの衝撃が加わった場合に、この衝撃によるエネルギーを吸収しつつ全長が縮まる所謂コラプシブル構造としている。 Here, the steering shaft 2 includes an outer shaft 7 and an inner shaft 8, and the front end portion of the outer shaft 7 and the rear end portion of the inner shaft 8 are spline-coupled and are coupled via a synthetic resin 8a. . Therefore, the outer shaft 7 and the inner shaft 8 can shorten the total length by breaking the synthetic resin 8a at the time of collision.
Further, the cylindrical steering column 3 inserted through the steering shaft 2 is formed by combining the outer column 9 and the inner column 10 in a telescope shape, and absorbs energy due to the impact in the axial direction when an impact is applied in the axial direction. However, it has a so-called collapsible structure in which the overall length is reduced.

そして、インナコラム１０の前端側を、ウォーム減速機１１のハウジング１１ａの後端側に固定し、インナシャフト８をウォーム減速機１１のハウジング１１ａ内に挿通して、このインナシャフト８の前端部がウォーム減速機１１のハウジング１１ａの前端面から突出する出力軸１４に連結されている。
また、ステアリングコラム３のアウタコラム９がアッパ車体側ブラケット１５によって車体側部材２０にチルト及びテレスコ位置調整可能に支持されていると共に、操舵補助機構４におけるウォーム減速機１１のハウジング１１ａが車体側部材２０に取付けられたロア車体側ブラケット１６に回転自在に支持されたピボット軸１６ａを中心として上下方向に揺動可能に支持されている。 Then, the front end side of the inner column 10 is fixed to the rear end side of the housing 11a of the worm reducer 11, the inner shaft 8 is inserted into the housing 11a of the worm reducer 11, and the front end portion of the inner shaft 8 is The worm reducer 11 is connected to an output shaft 14 protruding from the front end surface of the housing 11a.
The outer column 9 of the steering column 3 is supported on the vehicle body side member 20 by the upper vehicle body side bracket 15 so that the tilt and telescopic position can be adjusted, and the housing 11a of the worm speed reducer 11 in the steering assist mechanism 4 is the vehicle body side member. A pivot shaft 16a that is rotatably supported by the lower vehicle body side bracket 16 attached to 20 is supported so as to be swingable in the vertical direction.

中間シャフト１８は、図１に示すように、自在継手１７Ａに連結されたシャフトとしての雄軸４０と、この雄軸４０の外周側に圧入外嵌され且つ自在継手１７Ｂに連接された雌軸４５とを備えている。
ここで、自在継手１７Ａは、図１に示すように、一対のヨーク２９及び３０と、これら一対のヨーク２９及び３０を連結する十字軸２８とで構成されている。 As shown in FIG. 1, the intermediate shaft 18 includes a male shaft 40 as a shaft connected to the universal joint 17A, and a female shaft 45 that is press-fitted to the outer peripheral side of the male shaft 40 and connected to the universal joint 17B. And.
Here, as shown in FIG. 1, the universal joint 17 </ b> A includes a pair of yokes 29 and 30 and a cross shaft 28 that connects the pair of yokes 29 and 30.

ヨーク３０は、図２〜図５に示すように、雄軸４０を抱き締める一対の締付板部３１ａ及び３１ｂと、これら締付板部３１ａ及び３１ｂの下端部を連結する連結板部３１ｃとからＵ字状に形成された連結部３１と、連結部３１の締付板部３１ａ及び３２ｂから軸方向に突出して十字軸２８を支持する一対のアーム部３２ａ及び３２ｂと、締付板部３１ａ及び３１ｂ間に橋架されて雄軸４０を連結部３１に対して締付ける締付ボルト３３とで構成されている。   As shown in FIGS. 2 to 5, the yoke 30 includes a pair of fastening plate portions 31 a and 31 b for hugging the male shaft 40, and a connecting plate portion 31 c for connecting the lower ends of the fastening plate portions 31 a and 31 b. A connecting portion 31 formed in a U-shape, a pair of arm portions 32a and 32b that protrude in the axial direction from the fastening plate portions 31a and 32b of the connecting portion 31 to support the cross shaft 28, a fastening plate portion 31a, and It is constituted by a fastening bolt 33 that is bridged between 31 b and fastens the male shaft 40 to the connecting portion 31.

ここで、一対の締付板部３１ａ及び３１ｂの夫々は、図２〜図５に示すように、連結板部３１ｃに連結する軸方向長さが長い長方形状の基部３４ａと、この基部３４ａに連接して上方に延長し、アーム部３２ａ及び３２ｂ側の上端がアーム部３２ａ及び３２ｂから離れるに従い徐々に高くなる台形部３４ｂとで形成されている。そして、締付板部３１ａ及び３１ｂの基部３４ａと台形部３４ｂとの境界位置における軸方向の略中央部に、互いに対向して締付ボルト３３を挿通する挿通孔３１ｄ及び締付ボルト３３が螺合する雌ねじ部３１ｅが個別に軸直角方向に延長して形成されている。また、締付板部３１ａ及び３１ｂの基部３４ａにアーム部３２ａ及び３２ｂが連結されている。   Here, as shown in FIGS. 2 to 5, each of the pair of fastening plate portions 31 a and 31 b includes a rectangular base portion 34 a having a long axial direction connected to the connection plate portion 31 c, and the base portion 34 a. The upper end on the side of the arm portions 32a and 32b is connected and extends upward, and is formed with a trapezoidal portion 34b that gradually increases as the distance from the arm portions 32a and 32b increases. Then, an insertion hole 31d and a fastening bolt 33 through which the fastening bolt 33 is inserted face each other at a substantially central portion in the axial direction at the boundary position between the base portion 34a and the trapezoidal portion 34b of the fastening plate portions 31a and 31b. The mating female thread portions 31e are individually extended in the direction perpendicular to the axis. Also, the arm portions 32a and 32b are connected to the base portions 34a of the fastening plate portions 31a and 31b.

そして、締付ボルト３３は、図３に示すように、締付板部３１ａの挿通孔３１ｄに挿通されて締付板部３１ｂの外側面に係合する頭部３３ａと、この頭部３３ａに連設された締付板部３１ａの雌ねじ部３１ｄに螺合し締付板部３１ａの外側に突出する雄ねじ部３３ｂとで構成されている。
雄軸４０は、図２及び図３に示すように、先端部にＣ面取部４１が形成されていると共に、後述するように雄軸４０を締付板部３１ａ及び３１ｂ間に挿通して位置決めした状態で、締付ボルト３３に対向する上側位置に軸直角方向に延長するボルト係合凹部４２が形成され、さらに一対の締付板部３１ａ及び３１ｂと対向する側面位置に、これら締付板部３１ａ及び３１ｂと係合するようにその内周面間距離と略等しく、且つ例えばＣ面取部４１の最小径と略等しい厚みとなるように二面幅４３が形成されている。 As shown in FIG. 3, the fastening bolt 33 is inserted into the insertion hole 31d of the fastening plate portion 31a and engaged with the outer surface of the fastening plate portion 31b. It is composed of a male screw portion 33b that is screwed into the female screw portion 31d of the fastening plate portion 31a that is continuously provided and protrudes to the outside of the fastening plate portion 31a.
As shown in FIGS. 2 and 3, the male shaft 40 has a C chamfered portion 41 formed at the tip, and the male shaft 40 is inserted between the clamping plate portions 31a and 31b as will be described later. In the positioned state, a bolt engaging recess 42 extending in a direction perpendicular to the axis is formed at an upper position facing the tightening bolt 33, and further, the tightening is performed at side positions facing the pair of tightening plate portions 31a and 31b. A two-sided width 43 is formed so as to be substantially equal to the distance between the inner peripheral surfaces of the plate portions 31a and 31b and to be substantially equal to the minimum diameter of the C chamfered portion 41, for example.

ボルト係合凹部４２及び二面幅４３は、フライス盤で締付ボルト３３の雄ねじ部３３ｂの外径と略等しい外径のフライスで軸方向に所定長さだけ切削することにより形成されるフライス溝で構成されている。
そして、締付板部３１ａ及び３１ｂのボルト挿通孔３１ｄ及び雌ねじ部３１ｅの内周面から下方に連結板部３１ｃの少し手前までの間に凹部４４ａ及び４４ｂが形成されている。この凹部４４ａ及び４４ｂは、後述するように締付ボルト３３によって締付板部３１ａ及び３１ｂを締付けたときに、締付板部３１ａ及び３１ｂの凹部４４ａ及び４４ｂを挟む両側で雄軸４０の二面幅４３に確実に接触して保持力を向上させる機能を有する。 The bolt engaging recess 42 and the width across flats 43 are milling grooves formed by cutting a predetermined length in the axial direction with a milling machine having an outer diameter substantially equal to the outer diameter of the male threaded portion 33b of the clamping bolt 33. It is configured.
Recesses 44a and 44b are formed between the bolt insertion holes 31d of the fastening plate portions 31a and 31b and the inner peripheral surface of the female screw portion 31e and slightly before the connecting plate portion 31c. The recesses 44a and 44b are formed on both sides of the male shaft 40 on both sides of the recesses 44a and 44b of the fastening plate portions 31a and 31b when the fastening plate portions 31a and 31b are fastened by the fastening bolt 33 as will be described later. It has a function of improving the holding force by reliably contacting the surface width 43.

次に、上記実施形態の動作を説明する。
先ず、自在継手１７Ａのヨーク３０と雄軸４０とを組付けるには、雄軸４０のボルト係合凹部４２を上方に向けた状態で、二面幅４３をヨーク３０の連結部３１の締付板部３１ａ及び３１ｂ間に挿通して係合させ、下面を連結板部３１ｃに当接させる。
次いで、締付板部３１ａ及び３１ｂの挿通孔部３１ｄ及び雌ねじ部３１ｅと雄軸４０のボルト係合凹部４２とを位置した状態で、締付ボルト３３の雄ねじ部３３ｂを締付板部３１ａの挿通孔部３１ｄに挿通して反対側の雌ねじ部３１ｅに螺合する。 Next, the operation of the above embodiment will be described.
First, in order to assemble the yoke 30 and the male shaft 40 of the universal joint 17A, the two-surface width 43 is tightened to the connecting portion 31 of the yoke 30 with the bolt engaging recess 42 of the male shaft 40 facing upward. The plate portions 31a and 31b are inserted and engaged, and the lower surface is brought into contact with the connecting plate portion 31c.
Next, the male screw portion 33b of the fastening bolt 33 is placed on the fastening plate portion 31a with the insertion hole portion 31d and the female screw portion 31e of the fastening plate portions 31a and 31b and the bolt engaging concave portion 42 of the male shaft 40 positioned. It is inserted into the insertion hole portion 31d and screwed into the female screw portion 31e on the opposite side.

このとき、締付板部３１ａ及び３１ｂ間に挿通された雄軸４０に形成されたボルト係合凹部４２は、締付ボルト３３の雄ねじ部３３ｂの外径と略等しいフライス溝に形成されているので、締付ボルト３３の雄ねじ部３３ｂを確実に係合することができる。
この状態で、締付ボルト３３の雄ねじ部３３ｂを締付板部３１ａ及び３１ｂの雌ねじ部３１ｅにさらに螺合させて締付板部３１ｂの外側に突出させて締付けることにより、締付板部３１ａ及び３１ｂで二面幅４３の平坦面４３ａ及び４３ｂを押圧し、連結部３１で雄軸４０を抱き締め固定し、自在継手１７Ａのヨーク３０と雄軸４０との組付けを完了する。このとき、締付板部３１ａ及び３１ｂの内側面におけるボルト挿通孔部３１ｄ及び雌ねじ部３１ｅの下側に凹部４４ａ及び４４ｂが形成されているので、締付ボルト３３による締付状態で、図５に示すように、凹部４４ａ及び４４ｂを挟む前後の内側面を雄軸４０の二面幅４３に確実に接触させることができ、保持力を向上させることができるので、前述した従来例のように雄軸側に凹部を形成して、これに締付板部３１ａ及び３１ｂの内側面を食い込ませる場合に比較して接触部での面圧を小さくすることができ、長期の使用によっても摩耗を生じることがなく、ガタの発生を確実に防止しながらヨーク３０の連結部３１と雄軸４０との締結をより確実に行なうことができる。 At this time, the bolt engaging recess 42 formed in the male shaft 40 inserted between the fastening plate portions 31 a and 31 b is formed in a milling groove substantially equal to the outer diameter of the male screw portion 33 b of the fastening bolt 33. Therefore, the male screw portion 33b of the tightening bolt 33 can be reliably engaged.
In this state, the male screw portion 33b of the tightening bolt 33 is further screwed into the female screw portion 31e of the tightening plate portions 31a and 31b, and is protruded to the outside of the tightening plate portion 31b to be tightened. And 31b press the flat surfaces 43a and 43b having a width across flats 43, and the male shaft 40 is clamped and fixed by the connecting portion 31 to complete the assembly of the yoke 30 and the male shaft 40 of the universal joint 17A. At this time, since the concave portions 44a and 44b are formed below the bolt insertion hole portion 31d and the female screw portion 31e on the inner side surfaces of the fastening plate portions 31a and 31b, FIG. As shown in FIG. 3, the front and rear inner surfaces sandwiching the recesses 44a and 44b can be reliably brought into contact with the two-surface width 43 of the male shaft 40, and the holding force can be improved. Compared with the case where a concave portion is formed on the male shaft side, and the inner side surfaces of the clamping plate portions 31a and 31b are bitten into the concave portion, the surface pressure at the contact portion can be reduced, and wear is lost even after long-term use. Therefore, the connection between the connecting portion 31 of the yoke 30 and the male shaft 40 can be more reliably performed while reliably preventing the occurrence of backlash.

なお、上記実施形態においては、締付板部３１ａ及び３１ｂの双方に凹部４４ａ及び４４ｂを形成した場合について説明したが、これに限定されるものではなく、抱き締め時に大きな保持力を必要としない場合には、凹部４４ａ及び４４ｂの何れか一方を省略することもできる。
また、上記実施形態においては、一対の締付板部３１ａ及び３１ｂ間の間隔が軸方向で一定である場合について説明したが、これに限定されるものではなく、図５に示す一対の締付板部３１ａ及び３１ｂ間の間隔を凹部４４ａ及び４４ｂよりアーム部３２ａ及び３２ｂ側の間隔Ｘに比較して凹部４４ａ及び４４ｂよりアーム部３２ａ及び３２ｂとは反対側の間隔Ｙを広く設定し、雄軸４０の二面幅４３の幅もＸ及びＹに対応させて変更するようにしてもよい。この場合には、間隔Ｘ及びＹが異なるので、ヨーク３０の連結部３１と雄軸４０との位置決めを容易に行なうことができる。 In addition, in the said embodiment, although the case where the recessed parts 44a and 44b were formed in both the clamping board parts 31a and 31b was demonstrated, it is not limited to this, When a big holding force is not required at the time of hugging One of the recesses 44a and 44b can be omitted.
Moreover, in the said embodiment, although the case where the space | interval between a pair of clamping board parts 31a and 31b was constant in an axial direction was demonstrated, it is not limited to this, A pair of clamping shown in FIG. The interval between the plate portions 31a and 31b is set wider than the interval X between the recesses 44a and 44b and the arm portions 32a and 32b, and the interval Y on the side opposite to the arm portions 32a and 32b is set wider. The width of the width across flats 43 of the shaft 40 may also be changed corresponding to X and Y. In this case, since the distances X and Y are different, the connecting portion 31 of the yoke 30 and the male shaft 40 can be easily positioned.

また、上記実施形態においては、締付板部３１ａ及び３１ｂの双方に凹部を形成した場合について説明したが、これに限定されるものではなく、図６に示すように、連結板部３１ｃにも締付板部３１ａ及び３１ｂの凹部４４ａ及び４４ｂに連通する凹部５０を形成して、締付板部３１ａ及び３１ｂと連結板部３１ｃとの凹部を挟む前後とを確実に接触させることができ、より確実な締結状態を得ることができる。   Moreover, in the said embodiment, although the case where a recessed part was formed in both the clamping board parts 31a and 31b was demonstrated, it is not limited to this, As shown in FIG. By forming a recess 50 that communicates with the recesses 44a and 44b of the clamping plate portions 31a and 31b, the clamping plate portions 31a and 31b and the connecting plate portion 31c can be brought into contact with each other before and after sandwiching the recesses, A more reliable fastening state can be obtained.

さらに、上記実施形態においては、締付板部３１ａ及び３１ｂの対向位置に凹部４４ａ及び４４ｂを設けた場合について説明したが、これに限定されるものではなく、図７に示すように、締付板部３１ａ及び３１ｂの少なくとも一方例えば締付板部３１ａに、締付ボルト３３の挿通位置よりアーム部３２ａ，３２ｂ側位置からアーム部３２ａ，３２ｂとは反対側の端面まで延長する凹部６０を形成することにより、凹部６０位置での締付板部３１ａの剛性を低下させて可撓性を持たせるようにしてもよい。   Further, in the above-described embodiment, the case where the concave portions 44a and 44b are provided at the opposing positions of the fastening plate portions 31a and 31b has been described. However, the present invention is not limited to this, and as shown in FIG. At least one of the plate portions 31a and 31b, for example, the tightening plate portion 31a is formed with a recess 60 extending from the position where the tightening bolt 33 is inserted to the end surface opposite to the arm portions 32a and 32b from the position of the arm portions 32a and 32b. By doing so, you may make it give flexibility by reducing the rigidity of the clamping board part 31a in the recessed part 60 position.

この場合には、締付ボルト３３による締付時に、締付板部３１ａ及び３１ｂのアーム部３２ａ及び３２ｂ側のＢ部が締まり難くなり、逆にアーム部３２ａ及び３２ｂとは反対側のＣ部が締まり易くなる。このため、締付ボルト３３による締付け時に、凹部６０の締付ボルト３３との接触部分からアーム部３２ａとは反対側が雄軸４０の二面幅４３の平坦面４３ａにならい易くなり、締付板部３１ａの内面と雄軸４０の二面幅４３とが均等に接触するために保持力が向上する。したがって、長期の使用による摩耗を抑制して十分な保持力を得ることができる。   In this case, when tightening with the tightening bolt 33, the B portion on the arm portions 32a and 32b side of the tightening plate portions 31a and 31b is difficult to tighten, and conversely, the C portion on the opposite side to the arm portions 32a and 32b. Becomes easier to tighten. For this reason, at the time of tightening with the tightening bolt 33, the side opposite to the arm portion 32 a from the contact portion of the recess 60 with the tightening bolt 33 can easily follow the flat surface 43 a having the two-surface width 43 of the male shaft 40. Since the inner surface of the portion 31a and the two-surface width 43 of the male shaft 40 are in uniform contact, the holding force is improved. Therefore, it is possible to obtain a sufficient holding force by suppressing wear due to long-term use.

また、上記実施形態においては、雄軸４０の二面幅４３の平坦面４３ａ及び４３ｂをフライス加工面とした場合について説明したが、これに限定されるものではなく、図８（ａ）及び（ｂ）に示すように、ローレット掛けして微細な凹凸形状を形成したり、図８（ｃ）に示すようにショットピーニング処理によって微細な凹凸を形成したりするようにしてもよい。これらの場合には、二面幅４３の平坦面４３ａ及び４３ｂに微細な凹凸を形成しているので、締付ボルト３３による締付け時に、この微細な凹凸に締付板部３１ａ及び３１ｂの接触面が食い込んで、保持力を向上させることができ、ヨーク３０の雄軸４０の連結部３１との締結をより確実に行なうことができる。   Moreover, in the said embodiment, although the case where the flat surfaces 43a and 43b of the two-sided width 43 of the male shaft 40 were made into the milling surface was demonstrated, it is not limited to this, Fig.8 (a) and ( As shown in b), a fine uneven shape may be formed by knurling, or fine unevenness may be formed by shot peening as shown in FIG. 8C. In these cases, since the fine irregularities are formed on the flat surfaces 43a and 43b having the width across flats 43, the contact surfaces of the clamping plates 31a and 31b are formed on the fine irregularities when tightening with the tightening bolts 33. The holding force can be improved and the fastening of the yoke 30 to the connecting portion 31 of the male shaft 40 can be performed more reliably.

さらに、上記実施形態においては、ボルト係合凹部４２を備えた雄軸４０に本発明を適用した場合について説明したが、これに限定されるものではなく、ボルト係合凹部４２を省略した雄軸４０に本発明を適用することができる。
さらに、上記実施形態においては、締付ボルト３３の雄ねじ部３３ｂを締付板部３１ｂの雌ねじ部３１ｅに螺合させた場合について説明したが、これに限定されるものではなく、締付板部３１ｂの外側に突出した雄ねじ部３３ｂにナットを螺合させるようにしてもよく、また締付板部３１ｂの外側にナットを嵌合固定させた雌ねじ部３１ｅに螺合させるようにしてもよい。 Furthermore, in the said embodiment, although the case where this invention was applied to the male shaft 40 provided with the bolt engaging recessed part 42 was demonstrated, it is not limited to this, The male shaft which abbreviate | omitted the bolt engaging recessed part 42 The present invention can be applied to 40.
Furthermore, in the above-described embodiment, the case where the male threaded portion 33b of the tightening bolt 33 is screwed to the female threaded portion 31e of the tightening plate portion 31b has been described. However, the present invention is not limited to this. A nut may be screwed into the male screw portion 33b protruding to the outside of 31b, or may be screwed into a female screw portion 31e in which a nut is fitted and fixed to the outside of the fastening plate portion 31b.

さらにまた、上記実施形態においては、自在継手１７Ａのヨーク３０に本発明を適用した場合について説明したが、これに限定されるものではなく、自在継手１７Ａのヨーク２９に本発明を適用するようにしてもよい。
なおさらに、上記実施形態においては、本発明を電動パワーステアリング装置に適用した場合について説明したが、これに限定されるものではなく、操舵補助機構４を省略した通常のステアリング装置に本発明を適用することもできる。 Furthermore, in the above embodiment, the case where the present invention is applied to the yoke 30 of the universal joint 17A has been described. However, the present invention is not limited to this, and the present invention is applied to the yoke 29 of the universal joint 17A. May be.
In the above embodiment, the case where the present invention is applied to the electric power steering apparatus has been described. However, the present invention is not limited to this, and the present invention is applied to a normal steering apparatus in which the steering assist mechanism 4 is omitted. You can also

本発明を電動パワーステアリング装置に適用した場合の全体構成図である。It is a whole block diagram at the time of applying this invention to an electric power steering device. 本発明による自在継手のヨークとシャフトとの分解斜視図である。It is a disassembled perspective view of the yoke and shaft of the universal joint by this invention. ヨーク及びシャフトの締結状態を示す平面図である。It is a top view which shows the fastening state of a yoke and a shaft. ヨークの側面図である。It is a side view of a yoke. 図４のＡ−Ａ線上の断面図である。It is sectional drawing on the AA line of FIG. 本発明の変形例を示す図５と同様の断面図である。It is sectional drawing similar to FIG. 5 which shows the modification of this invention. 本発明の変形例を示す図５と同様の断面図である。It is sectional drawing similar to FIG. 5 which shows the modification of this invention. 雄軸の二面幅に形成する微細な凹凸形状を示す図である。It is a figure which shows the fine uneven | corrugated shape formed in the two surface width of a male axis | shaft.

符号の説明Explanation of symbols

１…ステアリングホイール、２…ステアリングシャフト、３…ステアリングコラム、４…操舵補助機構、５…タイロッド、６…ステアリングギア機構、１１…ウォーム減速機、１２…電動モータ、１７Ａ，１７Ｂ…自在継手、１８…中間シャフト、２０…車体側部材、２９，３０…ヨーク、３１…連結部、３１ａ，３１ｂ…締付板部、３１ｃ…連結板部、３１ｄ…ボルト挿通孔部，３１ｅ…雌ねじ部、３２ａ，３２ｂ…アーム部、３３…締付ボルト、４０…雄軸、４２…ボルト係合凹部、４３…二面幅、４４ａ，４４ｂ…凹部、５０…凹部、６０…凹部 DESCRIPTION OF SYMBOLS 1 ... Steering wheel, 2 ... Steering shaft, 3 ... Steering column, 4 ... Steering assist mechanism, 5 ... Tie rod, 6 ... Steering gear mechanism, 11 ... Worm speed reducer, 12 ... Electric motor, 17A, 17B ... Universal joint, 18 ... Intermediate shaft, 20 ... Car body side member, 29, 30 ... Yoke, 31 ... Connection part, 31a, 31b ... Tightening plate part, 31c ... Connection plate part, 31d ... Bolt insertion hole part, 31e ... Female thread part, 32a, 32b ... arm portion, 33 ... clamping bolt, 40 ... male shaft, 42 ... bolt engagement recess, 43 ... width across flats, 44a, 44b ... recess, 50 ... recess, 60 ... recess

Claims (5)

シャフトと、該シャフトを抱き締める自在継手のヨークとを備えた自在継手のヨークとシャフトとの締結構造であって、
前記ヨークは前記シャフトを抱き締める一対の締付板部とこれら締付板部を連結する連結板部とからＵ字状に形成された連結部と、該連結部の締付板部から突出して十字軸を支持するアーム部と、前記連結部の一対の締付板部間に橋架されて前記シャフトを締付ける締付ボルトとを備え、
前記締付板部の内面の前記締付ボルトを挿通するボルト挿通部の近傍における前記シャフトとの接触面に凹部を形成し、
前記一対の締付板部間の間隔及びシャフトの幅を、前記凹部より前記アーム部側に比較して前記凹部よりアーム部とは反対側を広く設定した
ことを特徴とする自在継手のヨークとシャフトとの締結構造。 It is a fastening structure of a universal joint yoke and a shaft comprising a shaft and a universal joint yoke for hugging the shaft,
The yoke has a U-shaped connecting portion formed from a pair of fastening plate portions for hugging the shaft, and a connecting plate portion for connecting the fastening plate portions, and a cross protruding from the fastening plate portion of the connecting portion. An arm portion that supports the shaft, and a fastening bolt that is bridged between a pair of fastening plate portions of the connecting portion and fastens the shaft,
Forming a recess in the contact surface with the shaft in the vicinity of the bolt insertion portion for inserting the fastening bolt on the inner surface of the fastening plate portion ;
A universal joint yoke characterized in that an interval between the pair of clamping plates and a shaft width are set wider on the side opposite to the arm than the recess than on the arm. Fastening structure with shaft. 前記凹部は、少なくとも一方の前記締付板部のボルト挿通部と前記連結板部との間に形成されていることを特徴とする請求項１に記載の自在継手のヨークとシャフトとの締結構造。   2. The fastening structure between a universal joint yoke and a shaft according to claim 1, wherein the recess is formed between the bolt insertion portion of the at least one fastening plate portion and the connecting plate portion. . 前記凹部は、少なくとも一方の前記締付板部のボルト挿通部近傍から前記アーム部とは反対側の端面まで延長されていることを特徴とする請求項１に記載の自在継手のヨークとシャフトとの締結構造。   2. The universal joint yoke and shaft according to claim 1, wherein the recess extends from the vicinity of the bolt insertion portion of at least one of the fastening plate portions to an end surface opposite to the arm portion. Fastening structure. 前記凹部は、前記締付板部の一方のボルト挿通部近傍から前記連結板部を経て他方の締付板部のボルト挿通部近傍までの間に形成されていることを特徴とする請求項１に記載の自在継手のヨークとシャフトとの締結構造。   2. The concave portion is formed between the vicinity of one bolt insertion portion of the fastening plate portion and the vicinity of the bolt insertion portion of the other fastening plate portion through the connecting plate portion. The fastening structure of the universal joint yoke and shaft as described in 1. 前記シャフトは、締付板部によって抱き締められる位置に二面幅が形成され、該二面幅の表面に微細な凹凸形状が形成されていることを特徴とする請求項１乃至４の何れか１項に記載の自在継手のヨークとシャフトとの締結構造。 The shaft, two surface width in a position to be hugged by the plate portion clamping are formed, any one of claims 1 to 4, characterized in that the surface of the two-surface width is fine irregularities are formed A fastening structure of the universal joint yoke and the shaft according to the item.
JP2008048191A 2008-02-28 2008-02-28 Fastening structure of universal joint yoke and shaft Expired - Fee Related JP5029425B2 (en)

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JP3658855B2 (en) * 1996-04-26 2005-06-08 日本精工株式会社 Joint between shaft and universal joint yoke
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JP4531692B2 (en) * 2005-12-16 2010-08-25 光洋機械工業株式会社 Universal joint yoke
JP2007292188A (en) * 2006-04-25 2007-11-08 Jtekt Corp Yoke and shaft joint-structure of universal joint
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