JP5834928B2 - Cross shaft type universal joint yoke - Google Patents

Cross shaft type universal joint yoke Download PDF

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Publication number
JP5834928B2
JP5834928B2 JP2012005177A JP2012005177A JP5834928B2 JP 5834928 B2 JP5834928 B2 JP 5834928B2 JP 2012005177 A JP2012005177 A JP 2012005177A JP 2012005177 A JP2012005177 A JP 2012005177A JP 5834928 B2 JP5834928 B2 JP 5834928B2
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base
hole
flange
screw hole
central axis
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JP2013145008A (en
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誠一 森山
誠一 森山
辰徳 三田
辰徳 三田
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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

Description

この発明は、例えば自動車用操舵装置を構成する回転軸同士を、トルク伝達可能に接続する為の十字軸式自在継手（カルダンジョイント）を構成するヨークの改良に関する。   The present invention relates to an improvement in a yoke constituting a cross-shaft universal joint (cardan joint) for connecting, for example, rotating shafts constituting a steering apparatus for an automobile so that torque can be transmitted.

自動車のステアリング装置は、図７に示す様に構成している。運転者が操作するステアリングホイール１の動きは、ステアリングシャフト２、自在継手３、中間シャフト４、別の自在継手３を介して、ステアリングギヤユニット５の入力軸６に伝達される。そして、このステアリングギヤユニット５に内蔵したラック＆ピニオン機構により左右１対のタイロッド７、７を押し引きし、左右１対の操舵輪に、上記ステアリングホイール１の操作量に応じて、適切な舵角を付与する様に構成している。   The automobile steering device is configured as shown in FIG. The movement of the steering wheel 1 operated by the driver is transmitted to the input shaft 6 of the steering gear unit 5 through the steering shaft 2, the universal joint 3, the intermediate shaft 4, and another universal joint 3. Then, a pair of left and right tie rods 7, 7 are pushed and pulled by a rack and pinion mechanism built in the steering gear unit 5, and an appropriate rudder is applied to the pair of left and right steering wheels according to the operation amount of the steering wheel 1. It is configured to give corners.

この様なステアリング装置に組み込む前記各自在継手３、３として、一般的には、十字軸式自在継手が使用されている。この様な十字軸式自在継手を構成するヨークのうち、本発明の対象となる基本構造を備えたヨークの従来構造の第１例に就いて、図８〜１０を参照しつつ説明する。この従来構造の第１例であるヨーク８は、鋼材等の金属素材に鍛造加工及び切削加工を施す事により造られたもので、基部９と、１対の腕部１０、１０とを備える。   In general, a cross shaft type universal joint is used as each of the universal joints 3 and 3 incorporated in such a steering apparatus. Of the yokes constituting such a cross shaft type universal joint, a first example of a conventional structure of a yoke having a basic structure as an object of the present invention will be described with reference to FIGS. The yoke 8, which is a first example of this conventional structure, is made by subjecting a metal material such as steel to forging and cutting, and includes a base 9 and a pair of arms 10 and 10.

このうちの基部９は、円筒状であって、円周方向１箇所に軸方向に長いスリット１１を、この基部９の内周面と外周面と軸方向基端縁｛図８、図９の（Ａ）、図１０の（Ａ）に於ける右端縁｝とにのみ開口する状態で形成している。このスリット１１は、前記基部９の内径を拡縮可能とする為に設けられている。又、この基部９は、このスリット１１を挟んで設けられた第一、第二両フランジ部１２、１３を備える。この様な基部９の中心孔は、セレーション孔１４としている。又、前記第一、第二両フランジ部１２、１３の互いに整合する位置には、通孔１５とねじ孔１６とが、それぞれ前記セレーション孔１４の中心軸に対して捩れの位置の関係で形成されている。又、前記第一フランジ部１２の外側面で前記通孔１５の開口部を囲む部分には、後述するボルト２１の頭部２２の内側面を当接させる為の座面部１７が、前記通孔１５の軸方向に直交する方向に形成されている。即ち、これら通孔１５の中心軸と座面部１７の中心軸とは、互いに一致している。   Of these, the base 9 has a cylindrical shape, and is provided with a slit 11 which is long in the axial direction at one place in the circumferential direction, an inner peripheral surface and an outer peripheral surface of the base 9 and an axial base end edge {FIGS. (A) and the right end edge in (A) of FIG. The slit 11 is provided so that the inner diameter of the base 9 can be expanded and contracted. The base portion 9 includes first and second flange portions 12 and 13 provided with the slit 11 interposed therebetween. The center hole of the base 9 is a serration hole 14. In addition, at the positions where the first and second flange portions 12 and 13 are aligned with each other, a through hole 15 and a screw hole 16 are formed in relation to a twisted position with respect to the central axis of the serration hole 14, respectively. Has been. In addition, a seat surface portion 17 for abutting an inner surface of a head portion 22 of a bolt 21 to be described later is provided at a portion surrounding the opening portion of the through hole 15 on the outer surface of the first flange portion 12. It is formed in a direction orthogonal to 15 axial directions. That is, the central axis of these through holes 15 and the central axis of the seating surface portion 17 coincide with each other.

又、図８〜９に示す、前記ヨーク８の自由状態で、前記第一、第二両フランジ部１２、１３は、互いに平行になっている。又、同じ状態で、前記通孔１５及び座面部１７と、前記ねじ孔１６とは、互いに同心になっている。更に、同じ状態で、前記スリット１１の幅は、前記セレーション孔１４の内側に後述する回転軸１９の端部を挿入可能な寸法まで広くなっている。   Further, in the free state of the yoke 8 shown in FIGS. 8 to 9, the first and second flange portions 12 and 13 are parallel to each other. Further, in the same state, the through hole 15 and the seat surface portion 17 and the screw hole 16 are concentric with each other. Furthermore, in the same state, the width of the slit 11 is widened to a dimension that allows an end portion of a rotating shaft 19 to be described later to be inserted inside the serration hole 14.

又、前記両腕部１０、１０は、前記基部９の軸方向先端縁｛図８、図９の（Ａ）、図１０の（Ａ）に於ける左端縁｝のうちで、この基部９に関する直径方向反対側となる２箇所位置から軸方向に延出する状態で設けられている。前記両腕部１０、１０同士の配列方向（図８の上下方向）と、前記第一、第二両フランジ部１２、１３同士の配置方向（図８の表裏方向）とは、互いに９０度ずれている。又、前記両腕部１０、１０の先端部には、互いに同心の円孔１８、１８が形成されている。前記十字軸式自在継手を組み立てた状態で、これら両円孔１８、１８内には、それぞれ有底円筒状の軸受カップが内嵌固定される。これと共に、これら両軸受カップ内に、それぞれ複数本のニードルを介して、十字軸の端部が回動自在に支持される。   The arms 10 and 10 are related to the base 9 among the axial front end edges of the base 9 (the left end in FIGS. 8 and 9A and 10A). It is provided in a state extending in the axial direction from two positions on the opposite side in the diameter direction. The arrangement direction of the arms 10 and 10 (vertical direction in FIG. 8) and the arrangement direction of the first and second flange parts 12 and 13 (front and back direction in FIG. 8) are shifted by 90 degrees. ing. Further, concentric circular holes 18 and 18 are formed at the distal ends of the arms 10 and 10, respectively. In a state where the cross shaft type universal joint is assembled, a bottomed cylindrical bearing cup is fitted and fixed in each of the circular holes 18 and 18. At the same time, the ends of the cross shafts are rotatably supported in the bearing cups via a plurality of needles.

前記ステアリング装置を組み立てるべく、前記ヨーク８の基部９を、前記ステアリングシャフト２と、前記中間シャフト４と、前記入力軸６（図７）とのうちの何れかである、回転軸１９の端部に、トルクの伝達を可能に結合固定する場合には、先ず、図８〜９に示す様に、前記ヨーク８の自由状態で、前記基部９のセレーション孔１４の内側に、前記回転軸１９の端部を挿入する。これにより、このセレーション孔１４と、この回転軸１９の端部外周面に設けられた雄セレーション２０とを、セレーション係合させる。次いで、図１０に示す様に、ボルト２１を、前記通孔１５に挿通すると共に、前記ねじ孔１６に螺合し、更に締め付ける。これにより、前記スリット１１の幅を弾性的に狭める事に基づき、前記セレーション孔１４を弾性的に縮径させる。この結果、前記セレーション係合部の面圧が上昇し、前記基部９が前記回転軸１９の端部に、トルクの伝達を可能に結合固定された状態となる。   In order to assemble the steering device, the base 9 of the yoke 8 is the end of the rotating shaft 19 which is one of the steering shaft 2, the intermediate shaft 4 and the input shaft 6 (FIG. 7). In addition, when coupling and fixing torque transmission is possible, first, as shown in FIGS. 8 to 9, in the free state of the yoke 8, the rotation shaft 19 is placed inside the serration hole 14 of the base 9. Insert the end. Thereby, the serration hole 14 and the male serration 20 provided on the outer peripheral surface of the end portion of the rotating shaft 19 are engaged with each other. Next, as shown in FIG. 10, the bolt 21 is inserted into the through hole 15, screwed into the screw hole 16, and further tightened. Accordingly, the serration hole 14 is elastically reduced in diameter based on the narrowing of the width of the slit 11. As a result, the surface pressure of the serration engaging portion increases, and the base portion 9 is coupled and fixed to the end portion of the rotating shaft 19 so that torque can be transmitted.

上述した様なヨーク８の場合、前記ボルト２１を組み付ける（締め付ける）と、前記基部９が弾性変形乃至は塑性変形する事に伴い、前記両フランジ部１２、１３に傾斜が生じる。特に、上述したヨーク８の場合には、これら両フランジ部１２、１３同士の間に存在する前記スリット１１が、前記基部９の内周面と外周面と軸方向基端縁とにのみ開口している。この為、前記両フランジ部１２、１３の傾斜は、図１０の（Ｂ）に示す様な、前記基部９の径方向に対する傾斜（この基部９の径方向外側に向かう程、前記両フランジ部１２、１３同士が互いに近づき合う方向の傾斜）と、同図の（Ａ）に示す様な、前記基部９の軸方向に対する傾斜（この基部９の軸方向基端側に向かう程、前記両フランジ部１２、１３同士が互いに近づき合う方向の傾斜）とが、複合されたものとなる。又、これに伴って生じる、前記ねじ孔１６の中心軸と前記座面部１７の中心軸との傾斜も、図１０の（Ｂ）に示す様な、前記基部９の軸方向に直交する仮想平面内での傾斜と、同図の（Ａ）に示す様な、この基部９の軸方向と前記両フランジ部１２、１３の配列方向とに平行な仮想平面内での傾斜とが、複合されたものとなる。何れにしても、上述したヨーク８の場合には、前記ボルト２１を組み付けた状態で、前記ねじ孔１６の中心軸と前記座面部１７の中心軸とが互いに傾斜する為、この事に起因して、前記ボルト２１に曲げ応力が加わる。そして、このボルト２１の締め付け力が大きくなると、この曲げ応力が大きくなって、図１０に示す様に、このボルト２１の杆部の中間部が比較的大きく曲がる傾向となる。この結果、このボルト２１の耐久性が損なわれる可能性がある。   In the case of the yoke 8 as described above, when the bolt 21 is assembled (tightened), the flanges 12 and 13 are inclined as the base 9 is elastically deformed or plastically deformed. In particular, in the case of the yoke 8 described above, the slits 11 existing between the flange portions 12 and 13 open only on the inner peripheral surface, the outer peripheral surface, and the axial base end edge of the base portion 9. ing. For this reason, as shown in FIG. 10B, the inclinations of the flange portions 12 and 13 are inclined with respect to the radial direction of the base portion 9 (the more the flange portions 12 move toward the radially outer side of the base portion 9). , 13 in the direction of approaching each other), and the inclination of the base 9 with respect to the axial direction as shown in FIG. 12 and 13 are combined with each other. In addition, the inclination between the central axis of the screw hole 16 and the central axis of the seat surface portion 17 that occurs with this is also a virtual plane orthogonal to the axial direction of the base portion 9 as shown in FIG. And an inclination in a virtual plane parallel to the axial direction of the base 9 and the arrangement direction of the flanges 12 and 13 as shown in FIG. It will be a thing. In any case, in the case of the yoke 8 described above, the center axis of the screw hole 16 and the center axis of the seat surface portion 17 are inclined with each other in a state where the bolt 21 is assembled. Thus, bending stress is applied to the bolt 21. When the tightening force of the bolt 21 is increased, the bending stress is increased, and the intermediate portion of the flange portion of the bolt 21 tends to bend relatively large as shown in FIG. As a result, the durability of the bolt 21 may be impaired.

この様なボルトの耐久性に関する問題を緩和する為に、特許文献１には、図１１に示す様な構造が、特許文献２には、図１２に示す様な構造が、それぞれ記載されている。これら従来構造の第２〜３例のヨーク８ａ、８ｂも、上述した従来構造の第１例のヨーク８の場合と同様、基部９ａ、９ｂの円周方向１箇所に設けたスリット１１を、この基部９ａ、９ｂの内周面と外周面と軸方向基端縁とにのみ開口させている。但し、これら従来構造の第２〜３例のヨーク８ａ、８ｂの場合には、上述した従来構造の第１例のヨーク８の場合と異なり、図１１〜１２の（Ａ）（Ｂ）に示す自由状態で、第一フランジ部１２ａ、１２ｂに形成した座面部１７ａ、１７ｂの中心軸と、第二フランジ部１３ａ、１３ｂに形成したねじ孔１６ａ、１６ｂの中心軸とを、図１１〜１２の（Ｂ）に示す基部９ａ、９ｂの軸方向に直交する仮想平面内でのみ、互いに傾斜させている。これにより、図１１〜１２の（Ｃ）（Ｄ）に示すボルト２１の組み付け状態で、前記座面部１７ａ、１７ｂの中心軸と前記ねじ孔１６ａ、１６ｂの中心軸とが、図１１〜１２の（Ｄ）に示す前記基部９ａ、９ｂの軸方向に直交する仮想平面内で、互いに一致する傾向になる様にしている。そして、この様な構成を採用する事により、前記ボルト２１に加わる曲げ応力を抑えられる様にしている。   In order to alleviate the problem regarding the durability of such bolts, Patent Document 1 describes a structure as shown in FIG. 11 and Patent Document 2 describes a structure as shown in FIG. . The yokes 8a and 8b of the second to third examples of these conventional structures also have slits 11 provided at one place in the circumferential direction of the base portions 9a and 9b, as in the case of the yoke 8 of the first example of the conventional structure described above. The base portions 9a and 9b are opened only on the inner peripheral surface, the outer peripheral surface, and the axial base end edge. However, in the case of the yokes 8a and 8b of the second to third examples having these conventional structures, unlike the case of the yoke 8 of the first example having the conventional structure described above, the yokes 8a and 8b shown in FIGS. In a free state, the central axes of the seating surface portions 17a and 17b formed in the first flange portions 12a and 12b and the central axes of the screw holes 16a and 16b formed in the second flange portions 13a and 13b are shown in FIGS. They are inclined with respect to each other only in a virtual plane orthogonal to the axial direction of the base portions 9a and 9b shown in FIG. Thus, in the assembled state of the bolt 21 shown in FIGS. 11-12 (C) and (D), the center axis of the seat surface portions 17a, 17b and the center axis of the screw holes 16a, 16b are as shown in FIGS. In the virtual plane orthogonal to the axial direction of the bases 9a and 9b shown in (D), they tend to coincide with each other. By adopting such a configuration, bending stress applied to the bolt 21 can be suppressed.

上述した従来構造の第２〜３例の場合には、自由状態で、前記座面部１７ａ、１７ｂの中心軸と前記ねじ孔１６ａ、１６ｂの中心軸とを、前記基部９ａ、９ｂの軸方向に直交する仮想平面内では、互いに傾斜させているが、この基部９ａ、９ｂの軸方向と前記両フランジ部１２、１３同士の配列方向とに平行な仮想平面内では、互いに傾斜させていない。これに対し、上述した従来構造の第２〜３例の場合も、前述した従来構造の第１例の場合と同様、前記ボルト２１を組み付ける事に伴って生じる、前記座面部１７ａ、１７ｂの中心軸と前記ねじ孔１６ａ、１６ｂの中心軸との傾斜は、前記基部９ａ、９ｂの軸方向に直交する仮想平面内だけでなく、この基部９ａ、９ｂの軸方向と前記両フランジ部１２、１３同士の配列方向とに平行な仮想平面内でも生じる。従って、上述した従来構造の第２〜３例の場合も、前述した従来構造の第１例の場合と同様、前記ボルト２１を組み付けた状態では、前記座面部１７ａ、１７ｂの中心軸と前記ねじ孔１６ａ、１６ｂの中心軸とが、前記基部９ａ、９ｂの軸方向と前記両フランジ部１２、１３同士の配列方向とに平行な仮想平面内で、互いに傾斜する傾向となる｛従来構造の第１例に関する、図１０の（Ａ）参照｝。そして、この傾斜が大きくなった場合には、前記ボルト２１に加わる曲げ応力を十分に抑えられなくなる可能性がある。
尚、本発明に関連する先行技術文献として、上述した特許文献１〜２の他に、下記の特許文献３がある。 In the case of the second to third examples of the conventional structure described above, in the free state, the central axis of the seating surface portions 17a and 17b and the central axis of the screw holes 16a and 16b are arranged in the axial direction of the base portions 9a and 9b. Although they are inclined with respect to each other in the orthogonal virtual plane, they are not inclined with respect to each other in a virtual plane parallel to the axial direction of the base portions 9a and 9b and the arrangement direction of the flange portions 12 and 13. On the other hand, in the case of the second to third examples of the conventional structure described above, as in the case of the first example of the conventional structure described above, the center of the seating surface portions 17a and 17b, which is generated when the bolt 21 is assembled. The inclination of the shaft and the central axis of the screw holes 16a and 16b is not only in a virtual plane orthogonal to the axial direction of the base portions 9a and 9b, but also the axial direction of the base portions 9a and 9b and the flange portions 12 and 13. It also occurs in a virtual plane parallel to the direction of arrangement between them. Accordingly, in the second to third examples of the conventional structure described above, as in the case of the first example of the conventional structure described above, in the state where the bolt 21 is assembled, the central axis of the seat surface portions 17a and 17b and the screw The central axes of the holes 16a and 16b tend to be inclined with respect to each other in a virtual plane parallel to the axial direction of the base portions 9a and 9b and the arrangement direction of the flange portions 12 and 13. FIG. 10A regarding one example}. And when this inclination becomes large, there is a possibility that the bending stress applied to the bolt 21 cannot be sufficiently suppressed.
In addition to the above-mentioned Patent Documents 1 and 2, there is the following Patent Document 3 as a prior art document related to the present invention.

特開２００８−２９８２６７号公報JP 2008-298267 A 特開２００９−８１７４号公報JP 2009-8174 A 特開２００１−２５４７５５号公報JP 2001-254755 A

本発明は、上述の様な事情に鑑み、基部の円周方向１箇所に設けたスリットを、この基部の内周面と外周面と軸方向基端縁とにのみ開口させているヨークに関して、ボルトを組み付けた状態で、第一フランジ部に形成した座面部の中心軸と、第二フランジ部に形成したねじ孔の中心軸とを、互いにほぼ一致させる事ができる構造を実現すべく発明したものである。   In view of the circumstances as described above, the present invention relates to a yoke in which a slit provided at one location in the circumferential direction of the base is opened only on the inner peripheral surface, the outer peripheral surface, and the axial base end edge of the base. Invented to realize a structure in which the center axis of the seating surface portion formed in the first flange portion and the center axis of the screw hole formed in the second flange portion can be substantially matched with each other in a state where the bolt is assembled. Is.

本発明の十字軸式自在継手用ヨークは、回転軸の端部を結合固定する為の基部と、この基部の軸方向先端縁のうちで、この基部に関する直径方向反対側となる２箇所位置から軸方向に延出した１対の腕部と、これら両腕部の先端部に互いに同心に形成された１対の円孔とを備える。
このうちの基部は、筒状であって、円周方向１箇所に、この基部の内周面と外周面と軸方向基端縁とにのみ開口する状態で設けられた軸方向に長いスリットと、このスリットを挟んで設けられた第一、第二両フランジ部と、このうちの第一フランジ部に、前記基部の中心軸に対し捩れの位置の関係で形成された通孔と、同じく第二フランジ部の一部でこの通孔に整合する位置に形成されたねじ孔と、前記第一フランジ部の外側面で前記通孔の開口部を囲む部分に形成された座面部とを備えている。
そして、ボルトを、前記通孔に挿通すると共に、前記ねじ孔に螺合する事により、前記回転軸の端部を前記基部に結合固定する。
特に、本発明の十字軸式自在継手用ヨークに於いては、前記スリットの幅が前記基部の内側に前記回転軸の端部を挿入可能な寸法まで広くなっている状態で、前記ねじ孔の中心軸と前記座面部の中心軸とが、前記基部の軸方向に直交する仮想平面内でも、この基部の軸方向と前記第一、第二両フランジ部同士の配列方向とに平行な仮想平面内でも、互いに傾斜している。そして、この基部の内側で前記回転軸の端部を固定可能な寸法にまで前記スリットの幅を狭くした状態で、前記ねじ孔の中心軸と前記座面部の中心軸とが互いに一致する傾向になる。
以上の様な構成を有する本発明の十字軸式自在継手用ヨークを実施する場合には、追加的に、前記両腕部同士の配列方向と、前記第一、第二両フランジ部同士の配置方向とを、互いに９０度ずらした構成を採用する事ができる。
以上の様な構成を有する本発明の十字軸式自在継手用ヨークを実施する場合には、追加的に、自由状態で、前記通孔に挿通した前記ボルトの杆部を、前記ねじ孔に螺合する事が可能となる様に、前記通孔の内径寸法を、前記ボルトの杆部の外径寸法及び前記ねじ孔の内径寸法よりも大きく形成する構成を採用できる。
又、この様な構成を採用した場合には、追加的に、前記ボルトの杆部を前記ねじ孔に螺合した状態で、前記ボルトの杆部の外周面と、前記通孔の内周面とが当接しない様に構成する事ができる。
The yoke for a cross shaft type universal joint according to the present invention includes a base for coupling and fixing an end of a rotating shaft and an axial tip end of the base from two diametrically opposite positions with respect to the base. A pair of arm portions extending in the axial direction, and a pair of circular holes formed concentrically with each other at the tip portions of the both arm portions are provided.
Of these, the base has a cylindrical shape, and is provided with a long slit in the axial direction provided at one location in the circumferential direction so as to open only at the inner peripheral surface, the outer peripheral surface, and the axial base end edge of the base. The first and second flange portions provided across the slit, and the first flange portion of the first flange portion and the through-hole formed in the relationship of the twisted position with respect to the central axis of the base portion, A screw hole formed at a position matching with the through hole in a part of the two flange portions, and a seat surface portion formed at a portion surrounding the opening of the through hole on the outer surface of the first flange portion. Yes.
Then, the bolt is inserted into the through hole and screwed into the screw hole, whereby the end of the rotating shaft is coupled and fixed to the base.
In particular, in the cross shaft type universal joint yoke of the present invention, in the state where the width of the slit is wide enough to insert the end of the rotary shaft inside the base, A virtual plane in which the central axis and the central axis of the seating surface portion are parallel to the axial direction of the base portion and the arrangement direction of the first and second flange portions even in a virtual plane orthogonal to the axial direction of the base portion. Even within, they are inclined to each other. And, in a state where the width of the slit is narrowed to such a dimension that the end of the rotating shaft can be fixed inside the base, the central axis of the screw hole and the central axis of the seat surface portion tend to coincide with each other. Become.
When the yoke for a cross shaft type universal joint of the present invention having the above-described configuration is implemented, additionally, the arrangement direction of the both arm portions and the arrangement of the first and second flange portions are arranged. It is possible to adopt a configuration in which the directions are shifted from each other by 90 degrees.
In the case of implementing the cross shaft type universal joint yoke of the present invention having the above-described configuration, additionally, the bolt flange portion inserted through the through hole is screwed into the screw hole in a free state. A configuration in which the inner diameter dimension of the through hole is formed larger than the outer diameter dimension of the flange portion of the bolt and the inner diameter dimension of the screw hole so as to be able to be combined.
Further, when such a configuration is adopted, in addition, the outer peripheral surface of the bolt flange and the inner peripheral surface of the through hole in a state where the bolt flange is screwed into the screw hole. It can be configured so that does not come into contact.

上述の様な本発明の十字軸式自在継手用ヨークを実施する場合には、例えば請求項２に記載した発明の様に、前記座面部の中心軸を前記第一フランジ部の厚さ方向に対して傾斜させ、且つ、前記ねじ孔の中心軸を前記第二フランジ部の厚さ方向に対して傾斜させる。
或いは、請求項３に記載した発明の様に、前記座面部の中心軸を前記第一フランジ部の厚さ方向に対して傾斜させ、且つ、前記ねじ孔の中心軸を前記第二フランジ部の厚さ方向に一致させる構造と、前記座面部の中心軸を前記第一フランジ部の厚さ方向に一致させ、且つ、前記ねじ孔の中心軸を前記第二フランジ部の厚さ方向に対して傾斜させる構造とのうちの、何れか一方の構造を採用する。 When the yoke for a cross shaft type universal joint of the present invention as described above is implemented, for example, as in the invention described in claim 2, the central axis of the seat surface portion is arranged in the thickness direction of the first flange portion. The central axis of the screw hole is inclined with respect to the thickness direction of the second flange portion.
Alternatively, as in the invention described in claim 3, the central axis of the seat surface portion is inclined with respect to the thickness direction of the first flange portion, and the central axis of the screw hole is set to the second flange portion. A structure that matches the thickness direction, a center axis of the seating surface portion matches a thickness direction of the first flange portion, and a center axis of the screw hole corresponds to the thickness direction of the second flange portion Either one of the structures to be inclined is adopted.

上述の様に構成する本発明の十字軸式自在継手用ヨークによれば、前記ボルトを組み付けた状態、即ち、前記通孔に挿通したこのボルトの杆部を前記ねじ孔に螺合し、更に締め付ける事により、前記基部の内側で前記回転軸の端部を固定可能な寸法にまで前記スリットの幅を狭くした状態で、前記ねじ孔の中心軸と、前記ボルトの頭部の内側面を当接させる為の前記座面部の中心軸とを、互いにほぼ一致させる事ができる。この為、前記ボルトの締め付け力が大きくなった場合にも、このボルトに大きな曲げ応力が加わる事を防止できる。この結果、このボルトの耐久性を高める事ができる。   According to the cross shaft type universal joint yoke of the present invention configured as described above, the bolt is assembled, that is, the flange portion of the bolt inserted into the through hole is screwed into the screw hole, By tightening, the central axis of the screw hole and the inner surface of the head of the bolt are brought into contact with each other in a state where the width of the slit is narrowed to such a size that the end of the rotary shaft can be fixed inside the base. It is possible to make the central axes of the seating surface portions for contact substantially coincide with each other. For this reason, even when the tightening force of the bolt is increased, it is possible to prevent a large bending stress from being applied to the bolt. As a result, the durability of the bolt can be increased.

又、請求項２に記載した発明の構成を採用すれば、前記第一フランジ部の厚さ方向に対する前記座面部の中心軸の傾斜角度と、前記第二フランジ部の厚さ方向に対する前記ねじ孔の中心軸の傾斜角度とを、比較的小さく抑えられる。この為、前記第一フランジ部に対する前記座面部の形成のし易さと、前記第二フランジ部に対する前記ねじ孔の形成のし易さとを、それぞれ良好にできる。
又、請求項３に記載した発明に関して、前記座面部の中心軸を前記第一フランジ部の厚さ方向に一致させる構成を採用する場合には、この第一フランジ部に対する前記座面部の形成のし易さを、より高いレベルで良好にできる。これに対し、前記ねじ孔の中心軸を前記第二フランジ部の厚さ方向に一致させる構成を採用する場合には、この第二フランジ部に対する前記ねじ孔の形成のし易さを、より高いレベルで良好にできる。 If the configuration of the invention described in claim 2 is adopted, the inclination angle of the central axis of the seat surface portion with respect to the thickness direction of the first flange portion and the screw hole with respect to the thickness direction of the second flange portion The inclination angle of the central axis of the lens can be kept relatively small. For this reason, it is possible to improve the ease of forming the seat surface portion with respect to the first flange portion and the ease of forming the screw hole with respect to the second flange portion.
Further, in the invention described in claim 3, in the case of adopting a configuration in which the central axis of the seat surface portion coincides with the thickness direction of the first flange portion, the seat surface portion is formed with respect to the first flange portion. The ease of operation can be improved at a higher level. On the other hand, when adopting a configuration in which the central axis of the screw hole coincides with the thickness direction of the second flange portion, the ease of forming the screw hole in the second flange portion is higher. Good at level.

本発明の実施の形態の第１例を示す側面図。The side view which shows the 1st example of embodiment of this invention. 図１のａ−ａ断面図（Ａ）、及び、（Ａ）のｂ−ｂ断面図（Ｂ）。FIG. 2 is a cross-sectional view taken along the line aa in FIG. 1 and a cross-sectional view taken along the line bb in FIG. ボルト組み付け後の状態で示す、図２と同様の図。The figure similar to FIG. 2 shown in the state after bolt assembly | attachment. 本発明の実施の形態の第２例を示す、図２と同様の図。The figure similar to FIG. 2 which shows the 2nd example of embodiment of this invention. 同第３例を示す、図２と同様の図。The figure similar to FIG. 2 which shows the 3rd example. 同第４例を示す、図２と同様の図。The figure similar to FIG. 2 which shows the 4th example. 従来から知られているステアリング装置の１例を示す斜視図。The perspective view which shows one example of the steering device known conventionally. 従来構造の第１例を示す側面図。The side view which shows the 1st example of a conventional structure. 図８のｃ−ｃ断面図（Ａ）、及び、（Ａ）のｄ−ｄ断面図（Ｂ）。Cc sectional drawing (A) of FIG. 8 and dd sectional drawing (B) of (A). ボルト組み付け後の状態で示す、図９と同様の図。The figure similar to FIG. 9 shown in the state after bolt assembly | attachment. 従来構造の第２例を、ボルト組み付け前の状態で示す側面図（Ａ）及び断面図（Ｂ）、並びに、ボルト組み付け後の状態で示す側面図（Ｃ）及び断面図（Ｄ）。The side view (A) and sectional view (B) which show the 2nd example of conventional structure in the state before bolt installation, and the side view (C) and sectional view (D) shown in the state after bolt installation. 同第３例を示す、図１１と同様の図。The figure similar to FIG. 11 which shows the 3rd example.

［実施の形態の第１例］
図１〜３は、本発明の実施の形態の第１例を示している。尚、本例のヨーク８ｃの特徴は、自由状態で互いに平行に配置された第一、第二両フランジ部１２ｃ、１３ｃに対する、通孔１５ｃとねじ孔１６ｃと座面部１７ｃとの形成方向にある。その他の部分の構造及び作用は、前述の図８〜１０に示した従来構造の第１例の場合と同様であるから、同等部分には同一符号を付して、重複する説明を省略若しくは簡略にし、以下、本例の特徴部分を中心に説明する。 [First example of embodiment]
1 to 3 show a first example of an embodiment of the present invention. The feature of the yoke 8c in this example is in the direction in which the through hole 15c, the screw hole 16c, and the seat surface portion 17c are formed with respect to the first and second flange portions 12c and 13c arranged in parallel with each other in a free state. . Since the structure and operation of the other parts are the same as those of the first example of the conventional structure shown in FIGS. 8 to 10 described above, the same parts are denoted by the same reference numerals, and redundant description is omitted or simplified. In the following, the characteristic part of this example will be mainly described.

本例の場合には、前記第一フランジ部１２ｃに形成した前記通孔１５ｃと前記座面部１７ｃとを、互いに同心に配置しているが、これら通孔１５ｃ及び座面部１７ｃの中心軸を、前記第一フランジ部１２ｃの厚さ方向に対して傾斜させている。又、前記第二フランジ部１３ｃに形成した前記ねじ孔１６ｃの中心軸も、この第二フランジ部１３ｃの厚さ方向に対して傾斜させている。これにより、自由状態で、前記通孔１５ｃ及び座面部１７ｃの中心軸と、前記ねじ孔１６ｃの中心軸とを、前記基部９ｃの軸方向に直交する仮想平面｛図２の（Ｂ）の紙面｝内でも、この基部９ｃの軸方向と前記第一、第二両フランジ部１２ｃ、１３ｃの配列方向とに平行な仮想平面｛図２の（Ａ）の紙面｝内でも、互いに傾斜させている。具体的には、前記通孔１５ｃ及び座面部１７ｃの中心軸と、前記ねじ孔１６ｃの中心軸とをそれぞれ、図２の（Ｂ）の紙面内で、互いに近づく方向に向かう程、前記両フランジ部１２ｃ、１３ｃの先端側｛図２の（Ｂ）の左端側｝に向かう方向に傾斜させると共に、図２の（Ａ）の紙面内で、互いに近づく方向に向かう程、前記基部９ｃの軸方向基端側｛図２の（Ａ）の右端側｝に向かう方向に傾斜させている。そして、この様な構成を採用する事により、図３に示すボルト２１の組み付け状態で、前記通孔１５ｃ及び座面部１７ｃの中心軸と、前記ねじ孔１６ｃの中心軸とが、互いにほぼ一致する様にしている。   In the case of this example, the through hole 15c formed in the first flange portion 12c and the seat surface portion 17c are arranged concentrically with each other, but the central axes of the through hole 15c and the seat surface portion 17c are The first flange portion 12c is inclined with respect to the thickness direction. The central axis of the screw hole 16c formed in the second flange portion 13c is also inclined with respect to the thickness direction of the second flange portion 13c. Thereby, in a free state, the center axis of the through-hole 15c and the seat surface portion 17c and the center axis of the screw hole 16c are set in a virtual plane orthogonal to the axial direction of the base portion 9c {paper surface of FIG. } And also in an imaginary plane {paper surface of FIG. 2A} parallel to the axial direction of the base portion 9c and the arrangement direction of the first and second flange portions 12c and 13c. . Specifically, the center axis of the through-hole 15c and the seating surface portion 17c and the center axis of the screw hole 16c are respectively closer to each other in the direction of approaching each other in the plane of FIG. Inclined in the direction toward the front end side {left end side in FIG. 2B) of the portions 12c and 13c, and the axial direction of the base 9c toward the direction closer to each other in the plane of FIG. It is inclined in the direction toward the base end side (the right end side in FIG. 2A). By adopting such a configuration, in the assembled state of the bolt 21 shown in FIG. 3, the central axis of the through hole 15c and the seating surface portion 17c and the central axis of the screw hole 16c substantially coincide with each other. Like.

即ち、本例の場合には、前記ボルト２１を組み付けた状態で、前記通孔１５ｃ及び座面部１７ｃの中心軸と、前記ねじ孔１６ｃの中心軸とが、互いにほぼ一致する様に、前記ボルト２１を組み付ける事に伴う、前記両フランジ部１２ｃ、１３ｃの傾斜方向及び傾斜量を考慮して、自由状態での前記通孔１５ｃ及び座面部１７ｃの中心軸と前記ねじ孔１６ｃの中心軸との傾斜方向及び傾斜量を規制している。この傾斜方向は、図１に示す様に、前記両フランジ部１２ｃ、１３ｃの配列方向（図１の表裏方向）から見た状態で、前記基部９ｃの中心軸に対してθ度傾斜したα方向となる。この傾斜角度θは、４５度程度が目安となるが、実際には、前記ヨーク８ｃの材質や前記スリット１１の形状及び寸法等の諸条件によって、その値が変化する。この為、前記傾斜角度θは、前記ヨーク８ｃの実際の変形に応じた適切な値に設定する。自由状態での前記通孔１５ｃ及び座面部１７ｃの中心軸と前記ねじ孔１６ｃの中心軸との傾斜量に就いても同様である。尚、前記座面部１７ｃは、図１の矢印イ方向に向かって深くなる様に形成している。   That is, in the case of the present example, the bolt 21 is assembled, so that the central axis of the through hole 15c and the seating surface portion 17c and the central axis of the screw hole 16c substantially coincide with each other. In consideration of the inclination direction and the amount of inclination of the two flange portions 12c and 13c associated with assembling 21, the center axis of the through hole 15c and the seating surface portion 17c in the free state and the center axis of the screw hole 16c The inclination direction and the amount of inclination are regulated. As shown in FIG. 1, this inclination direction is an α direction inclined by θ degrees with respect to the central axis of the base portion 9c when viewed from the arrangement direction of the flange portions 12c and 13c (front and back direction in FIG. 1). It becomes. The inclination angle θ is about 45 degrees as a guide, but in actuality, the value changes depending on various conditions such as the material of the yoke 8c and the shape and size of the slit 11. Therefore, the inclination angle θ is set to an appropriate value according to the actual deformation of the yoke 8c. The same applies to the amount of inclination between the central axis of the through hole 15c and the seating surface portion 17c and the central axis of the screw hole 16c in a free state. The seat surface portion 17c is formed so as to become deeper in the direction of arrow A in FIG.

又、本例の場合、前記通孔１５ｃの内径寸法は、前記ボルト２１の杆部の外径寸法よりも、十分に大きくしている。これにより、自由状態で、前記通孔１５ｃに挿通した前記ボルト２１の杆部を、前記ねじ孔１６ｃに螺合する事を可能にしている。これと共に、その後、このボルト２１を締め付けた状態で、このボルト２１の杆部の外周面に、前記通孔１５ｃの内周面（特に、この内周面の軸方向端部）が強く押し付けられる事を防止できる様にしている。   In the case of this example, the inner diameter dimension of the through hole 15c is sufficiently larger than the outer diameter dimension of the flange portion of the bolt 21. Thus, in a free state, the flange portion of the bolt 21 inserted through the through hole 15c can be screwed into the screw hole 16c. At the same time, with the bolt 21 tightened, the inner peripheral surface of the through hole 15c (particularly, the axial end of the inner peripheral surface) is strongly pressed against the outer peripheral surface of the flange portion of the bolt 21. So that things can be prevented.

上述の様に、本例の十字軸式自在継手用ヨークによれば、前記ボルト２１を組み付けた状態で、前記ねじ孔１６ｃの中心軸と、前記ボルト２１の頭部２２の内側面を当接させる為の座面部１７ｃの中心軸とを、互いにほぼ一致させる事ができる。この為、前記ボルト２１の締め付け力が大きくなった場合にも、このボルト２１に大きな曲げ応力が加わる事を防止できる。この結果、このボルト２１の耐久性を高める事ができる。   As described above, according to the cross shaft type universal joint yoke of this example, the center axis of the screw hole 16c and the inner surface of the head portion 22 of the bolt 21 are brought into contact with the bolt 21 in an assembled state. Therefore, the central axes of the seating surface portions 17c can be made to substantially coincide with each other. For this reason, even when the tightening force of the bolt 21 is increased, it is possible to prevent a large bending stress from being applied to the bolt 21. As a result, the durability of the bolt 21 can be increased.

又、本例の場合には、前記通孔１５ｃ及び座面部１７ｃの中心軸を前記第一フランジ部１２ｃの厚さ方向に対して傾斜させると共に、前記ねじ孔１６ｃの中心軸を前記第二フランジ部１３ｃの厚さ方向に対して傾斜させる構成を採用している。この為、前記第一フランジ部１２ｃの厚さ方向に対する前記通孔１５ｃ及び座面部１７ｃの中心軸の傾斜角度と、前記第二フランジ部１３ｃの厚さ方向に対する前記ねじ孔１６ｃの中心軸の傾斜角度とを、比較的小さく抑えられる。この為、前記第一フランジ部１２ｃに対する前記通孔１５ｃ及び座面部１７ｃの形成のし易さと、前記第二フランジ部１３ｃに対する前記ねじ孔１６ｃの形成のし易さとを、それぞれ良好にできる。   In the case of this example, the central axis of the through hole 15c and the seating surface portion 17c is inclined with respect to the thickness direction of the first flange portion 12c, and the central axis of the screw hole 16c is set to the second flange. The structure which inclines with respect to the thickness direction of the part 13c is employ | adopted. For this reason, the inclination angle of the central axis of the through hole 15c and the seat surface part 17c with respect to the thickness direction of the first flange portion 12c and the inclination of the central axis of the screw hole 16c with respect to the thickness direction of the second flange portion 13c. The angle can be kept relatively small. Therefore, it is possible to improve the ease of forming the through hole 15c and the seating surface portion 17c with respect to the first flange portion 12c and the ease of forming the screw hole 16c with respect to the second flange portion 13c.

［実施の形態の第２例］
図４は、本発明の実施の形態の第２例を示している。本例の場合には、ねじ孔１６ｃの中心軸のみを、第二フランジ部１３ｃの厚さ方向に対して傾斜させており、通孔１５及び座面部１７の中心軸は、第一フランジ部１２の厚さ方向に一致させている。この様な構成を採用する本例の場合には、この第一フランジ部１２に対する前記通孔１５及び座面部１７の形成のし易さを、より高いレベルで良好にできる。
その他の構成及び作用は、上述した実施の形態の第１例の場合と同様であるから、同等部分には同一符号又は同種の符号（同一数字及び異なるアルファベット文字から成る符号）を付して、重複する図示並びに説明は省略する。 [Second Example of Embodiment]
FIG. 4 shows a second example of the embodiment of the present invention. In the case of this example, only the central axis of the screw hole 16c is inclined with respect to the thickness direction of the second flange portion 13c, and the central axes of the through hole 15 and the seat surface portion 17 are the first flange portion 12. It is matched with the thickness direction. In the case of this example employing such a configuration, the ease of forming the through hole 15 and the seating surface portion 17 with respect to the first flange portion 12 can be improved at a higher level.
Other configurations and operations are the same as in the case of the first example of the embodiment described above, and thus the same parts or the same kind of codes (symbols consisting of the same numerals and different alphabetic characters) are attached to the equivalent parts. The overlapping illustration and description are omitted.

［実施の形態の第３例］
図５は、本発明の実施の形態の第３例を示している。本例の場合には、通孔１５ｃ及び座面部１７ｃの中心軸のみを、第一フランジ部１２ｃの厚さ方向に対して傾斜させており、ねじ孔１６の中心軸は、第二フランジ部１３の厚さ方向に一致させている。この様な構成を採用する本例の場合には、この第二フランジ部１３に対する前記ねじ孔１６の形成のし易さを、より高いレベルで良好にできる。
その他の構成及び作用は、前述した実施の形態の第１例の場合と同様であるから、同等部分には同一符号又は同種の符号（同一数字及び異なるアルファベット文字から成る符号）を付して、重複する図示並びに説明は省略する。 [Third example of embodiment]
FIG. 5 shows a third example of the embodiment of the present invention. In the case of this example, only the central axes of the through hole 15c and the seating surface portion 17c are inclined with respect to the thickness direction of the first flange portion 12c, and the central axis of the screw hole 16 is the second flange portion 13. It is matched with the thickness direction. In the case of this example employing such a configuration, the ease of forming the screw hole 16 in the second flange portion 13 can be improved at a higher level.
Other configurations and operations are the same as in the case of the first example of the embodiment described above, and therefore, the same parts or the same kind of codes (symbols consisting of the same numerals and different alphabetic characters) are attached to the equivalent parts. The overlapping illustration and description are omitted.

［実施の形態の第４例］
図６は、本発明の実施の形態の第４例を示している。本例の場合には、座面部１７ｃの中心軸のみを、第一フランジ部１２ｄの厚さ方向に対して傾斜させている。通孔１５の中心軸は、この第一フランジ部１２ｄの厚さ方向に一致させており、ねじ孔１６の中心軸も、第二フランジ部１３の厚さ方向に一致させている。この様な構成を採用する本例の場合には、前記第一フランジ部１２ｄに対する前記通孔１５の形成のし易さと、前記第二フランジ部１３に対する前記ねじ孔１６の形成のし易さとを、それぞれより高いレベルで良好にできる。
その他の構成及び作用は、前述した実施の形態の第１例の場合と同様であるから、同等部分には同一符号又は同種の符号（同一数字及び異なるアルファベット文字から成る符号）を付して、重複する図示並びに説明は省略する。 [Fourth Example of Embodiment]
FIG. 6 shows a fourth example of the embodiment of the present invention. In the case of this example, only the central axis of the seat surface portion 17c is inclined with respect to the thickness direction of the first flange portion 12d. The central axis of the through hole 15 is matched with the thickness direction of the first flange portion 12 d, and the central axis of the screw hole 16 is also matched with the thickness direction of the second flange portion 13. In the case of this example employing such a configuration, it is easy to form the through hole 15 in the first flange portion 12d and easy to form the screw hole 16 in the second flange portion 13. , Each can be better at a higher level.
Other configurations and operations are the same as in the case of the first example of the embodiment described above, and therefore, the same parts or the same kind of codes (symbols consisting of the same numerals and different alphabetic characters) are attached to the equivalent parts. The overlapping illustration and description are omitted.

本発明は、基部の円周方向１箇所に設けたスリットが、この基部の内周面と外周面と軸方向基端縁とにのみ開口しているヨークであって、基部を構成する第一、第二両フランジ部同士の配列方向と、１対の腕部同士の配列方向とが、互いに直角になっている構造に適用できる。但し、本発明の技術的範囲からは外れるが、基部の円周方向１箇所に設けたスリットが、この基部の内周面と外周面と軸方向基端縁とにのみ開口しているヨークであって、基部を構成する第一、第二両フランジ部同士の配列方向と、１対の腕部同士の配列方向とが互いに一致している構造（例えば、特許文献３の図６〜８参照）に対しても、適用できる。
The present invention is a yoke in which a slit provided at one place in the circumferential direction of the base portion is opened only on the inner peripheral surface, the outer peripheral surface, and the axial base end edge of the base portion, and the first portion constituting the base portion The arrangement direction of the second flange portions and the arrangement direction of the pair of arm portions can be applied to a structure that is perpendicular to each other . However, although not included in the technical scope of the present invention, a slit provided in one circumferential direction of the base is a yoke that is open only on the inner peripheral surface, the outer peripheral surface, and the axial base end edge of the base. In addition, the structure in which the arrangement direction of the first and second flange parts constituting the base part and the arrangement direction of the pair of arm parts coincide with each other (for example, see FIGS. 6 to 8 of Patent Document 3). ) Is also applicable.

１ ステアリングホイール
２ ステアリングシャフト
３ 自在継手
４ 中間シャフト
５ ステアリングギヤユニット
６ 入力軸
７ タイロッド
８、８ａ〜８ｆ ヨーク
９、９ａ〜９ｆ 基部
１０ 腕部
１１ スリット
１２、１２ａ〜１２ｄ 第一フランジ部
１３、１３ａ〜１３ｃ 第二フランジ部
１４ セレーション孔
１５、１５ａ〜１５ｃ 通孔
１６、１６ａ〜１６ｃ ねじ孔
１７、１７ａ〜１７ｃ 座面部
１８ 円孔
１９ 回転軸
２０ 雄セレーション部
２１ ボルト
２２ 頭部 DESCRIPTION OF SYMBOLS 1 Steering wheel 2 Steering shaft 3 Universal joint 4 Intermediate shaft 5 Steering gear unit 6 Input shaft 7 Tie rod 8, 8a-8f Yoke 9, 9a-9f Base part 10 Arm part 11 Slit 12, 12a-12d First flange part 13, 13a -13c 2nd flange part 14 Serration hole 15, 15a-15c Through hole 16, 16a-16c Screw hole 17, 17a-17c Seat surface part 18 Circular hole 19 Rotating shaft 20 Male serration part 21 Bolt 22 Head

Claims (3)

回転軸の端部を結合固定する為の基部と、この基部の軸方向先端縁のうちで、この基部に関する直径方向反対側となる２箇所位置から軸方向に延出した１対の腕部と、これら両腕部の先端部に互いに同心に形成された１対の円孔とを備え、
このうちの基部は、筒状であって、円周方向１箇所に、この基部の内周面と外周面と軸方向基端縁とにのみ開口する状態で設けられた軸方向に長いスリットと、このスリットを挟んで設けられた第一、第二両フランジ部と、このうちの第一フランジ部に、前記基部の中心軸に対し捩れの位置の関係で形成された通孔と、同じく第二フランジ部の一部でこの通孔に整合する位置に形成されたねじ孔と、前記第一フランジ部の外側面で前記通孔の開口部を囲む部分に形成された座面部とを備えており、
ボルトを、前記通孔に挿通すると共に、前記ねじ孔に螺合する事により、前記回転軸の端部を前記基部に結合固定する、
十字軸式自在継手用ヨークに於いて、
前記両腕部同士の配列方向と、前記第一、第二両フランジ部同士の配置方向とは、互いに９０度ずれており、
前記スリットの幅が前記基部の内側に前記回転軸の端部を挿入可能な寸法まで広くなっている状態で、前記ねじ孔の中心軸と前記座面部の中心軸とが、前記基部の軸方向に直交する仮想平面内でも、この基部の軸方向と前記第一、第二両フランジ部同士の配列方向とに平行な仮想平面内でも、互いに傾斜しており、この基部の内側で前記回転軸の端部を固定可能な寸法にまで前記スリットの幅を狭くした状態で、前記ねじ孔の中心軸と前記座面部の中心軸とが互いに一致する傾向になり、
自由状態で、前記通孔に挿通した前記ボルトの杆部を、前記ねじ孔に螺合する事が可能となる様に、前記通孔の内径寸法を、前記ボルトの杆部の外径寸法及び前記ねじ孔の内径寸法よりも大きく形成しており、
前記ボルトの杆部を前記ねじ孔に螺合した状態で、前記ボルトの杆部の外周面と、前記通孔の内周面とが当接しない事を特徴とする十字軸式自在継手用ヨーク。
A base for coupling and fixing the end of the rotating shaft, and a pair of arms extending in the axial direction from two positions opposite to the diametrical direction with respect to the base in the axial front end edge of the base; A pair of circular holes formed concentrically with each other at the tips of both arms,
Of these, the base has a cylindrical shape, and is provided with a long slit in the axial direction provided at one location in the circumferential direction so as to open only at the inner peripheral surface, the outer peripheral surface, and the axial base end edge of the base. The first and second flange portions provided across the slit, and the first flange portion of the first flange portion and the through-hole formed in the relationship of the twisted position with respect to the central axis of the base portion, A screw hole formed at a position matching with the through hole in a part of the two flange portions, and a seat surface portion formed at a portion surrounding the opening of the through hole on the outer surface of the first flange portion. And
The bolt is inserted into the through hole and screwed into the screw hole, thereby fixing the end of the rotating shaft to the base.
In the cross shaft type universal joint yoke,
The arrangement direction of the both arm portions and the arrangement direction of the first and second flange portions are shifted from each other by 90 degrees,
The center axis of the screw hole and the center axis of the seat surface portion are in the axial direction of the base portion in a state where the width of the slit is wide enough to insert the end of the rotating shaft inside the base portion. Even in a virtual plane orthogonal to the axial direction of the base portion and a virtual plane parallel to the arrangement direction of the first and second flange portions, they are inclined with respect to each other. the end while narrowing the width of the slit to a fixable size of Ri Do tend to the center axis of the threaded hole and the center axis of the seat surface portion coincide with each other,
In the free state, the inner diameter dimension of the through hole is set to the outer diameter dimension of the bolt flange section so that the flange section of the bolt inserted into the through hole can be screwed into the screw hole. It is formed larger than the inner diameter dimension of the screw hole,
The yoke for a cross shaft type universal joint , wherein the outer peripheral surface of the bolt flange and the inner peripheral surface of the through hole do not come into contact with the bolt flange engaged with the screw hole. .
前記座面部の中心軸が前記第一フランジ部の厚さ方向に対して傾斜しており、且つ、前記ねじ孔の中心軸が前記第二フランジ部の厚さ方向に対して傾斜している、請求項１に記載した十字軸式自在継手用ヨーク。   The central axis of the seat surface portion is inclined with respect to the thickness direction of the first flange portion, and the central axis of the screw hole is inclined with respect to the thickness direction of the second flange portion. The yoke for a cross shaft type universal joint according to claim 1. 前記座面部の中心軸が前記第一フランジ部の厚さ方向に対して傾斜しており、且つ、前記ねじ孔の中心軸が前記第二フランジ部の厚さ方向に一致している構造と、前記座面部の中心軸が前記第一フランジ部の厚さ方向に一致しており、且つ、前記ねじ孔の中心軸が前記第二フランジ部の厚さ方向に対して傾斜している構造とのうちの、何れか一方の構造を採用している、請求項１に記載した十字軸式自在継手用ヨーク。
A structure in which a central axis of the seating surface portion is inclined with respect to a thickness direction of the first flange portion, and a central axis of the screw hole coincides with a thickness direction of the second flange portion; A structure in which a central axis of the seating surface portion coincides with a thickness direction of the first flange portion, and a central axis of the screw hole is inclined with respect to a thickness direction of the second flange portion. The yoke for a cross shaft type universal joint according to claim 1, wherein any one of the structures is adopted.
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