JP5251159B2 - Joint portion between shaft and universal joint yoke, and method for manufacturing shaft - Google Patents

Joint portion between shaft and universal joint yoke, and method for manufacturing shaft Download PDF

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JP5251159B2
JP5251159B2 JP2008032705A JP2008032705A JP5251159B2 JP 5251159 B2 JP5251159 B2 JP 5251159B2 JP 2008032705 A JP2008032705 A JP 2008032705A JP 2008032705 A JP2008032705 A JP 2008032705A JP 5251159 B2 JP5251159 B2 JP 5251159B2
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shaft
hole
bolt
flange
cylindrical
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JP2009203988A (en
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正治 五十嵐
誠一 森山
宏道 小森
毅 伊藤
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NSK Ltd
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NSK Ltd
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Priority to JP2008032705A priority Critical patent/JP5251159B2/en
Priority to PCT/JP2008/058142 priority patent/WO2008136445A1/en
Priority to DE112008001042.0T priority patent/DE112008001042B4/en
Priority to US12/594,087 priority patent/US8235420B2/en
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Description

この発明は、例えばステアリング装置を構成する各種シャフトの端部と自在継手のヨークとを結合する為に利用する、シャフトと自在継手のヨークとの結合部と、このシャフトの製造方法との改良に関する。   The present invention relates to an improvement of a joint between a shaft and a universal joint yoke and a method for manufacturing the shaft, which are used for coupling, for example, ends of various shafts constituting a steering device to a universal joint yoke. .

操舵輪に舵角を付与する為のステアリング装置は、図26に示す様に、後端部にステアリングホイール1を固定したステアリングシャフト2を、車体に支持したステアリングコラム3の内径側に、回転自在に支持している。そして、このステアリングシャフト2の前端部に、自在継手4を介して中間シャフト5の後端部を接続すると共に、この中間シャフト5の前端部に、自在継手6を介して、ステアリングギヤユニット7の入力シャフト8の後端部を接続している。この状態で、運転者が上記ステアリングホイール1を回転操作すると、その回転力が、上記各部材2、4、5、6を介して、上記ステアリングギヤユニット7に伝達される。この結果、このステアリングギヤユニット7の軸方向(図26の表裏方向)両端部に連結したタイロッド(図示せず)が押し引きされ、左右の操舵輪(図示せず)に舵角が付与される。   As shown in FIG. 26, the steering device for giving the steering angle to the steered wheels is rotatable to the inner diameter side of the steering column 3 supported by the vehicle body, with the steering shaft 2 having the steering wheel 1 fixed to the rear end. I support it. Then, the rear end portion of the intermediate shaft 5 is connected to the front end portion of the steering shaft 2 via the universal joint 4, and the steering gear unit 7 is connected to the front end portion of the intermediate shaft 5 via the universal joint 6. The rear end of the input shaft 8 is connected. In this state, when the driver rotates the steering wheel 1, the rotational force is transmitted to the steering gear unit 7 via the members 2, 4, 5, and 6. As a result, tie rods (not shown) connected to both ends of the steering gear unit 7 in the axial direction (front and back direction in FIG. 26) are pushed and pulled, and a steering angle is given to the left and right steering wheels (not shown). .

図27は、本発明の対象となる、シャフトと自在継手のヨークとの結合部の従来構造の1例として、特許文献1に記載されたものを示している。この図27は、上記中間シャフト5の前端部と、上記自在継手6を構成する一方のヨーク9との結合部の分解斜視図である。この一方のヨーク9の基半部(図27の右上側半部)には、欠円筒状のシャフト取付部10を設けている。又、このシャフト取付部10の内周面は、雌セレーション部11としている。又、このシャフト取付部10の円周方向両端縁には、互いに平行な1対のフランジ部12a、12bを設けている。そして、このうちの一方のフランジ部12aの一部に通孔13を、他方のフランジ部12bの一部にねじ孔(図示せず)を、それぞれ互いに同心に形成している。一方、上記中間シャフト5の前端部外周面は、雄セレーション部14としている。又、この中間シャフト5の外周面の前端縁の円周方向1個所に、係合凸部15を形成している。この係合凸部15は、上記中間シャフト5の前端部外周面に上記雄セレーション部14を形成した後、この中間シャフト5の前端部のうちで、上記係合凸部15を形成すべき部分の円周方向両側に存在する部分の肉を、それぞれ塑性変形により中央に寄せ集めて、径方向外方に***させる事により形成したものである。   FIG. 27 shows one described in Patent Document 1 as an example of a conventional structure of a joint portion between a shaft and a universal joint yoke, which is an object of the present invention. FIG. 27 is an exploded perspective view of a connecting portion between the front end portion of the intermediate shaft 5 and one yoke 9 constituting the universal joint 6. A half-cylindrical shaft mounting portion 10 is provided in the base half portion (upper right half portion in FIG. 27) of the one yoke 9. The inner peripheral surface of the shaft mounting portion 10 is a female serration portion 11. A pair of flange portions 12a and 12b that are parallel to each other are provided at both circumferential edges of the shaft mounting portion 10. A through hole 13 is formed in a part of one of the flange parts 12a and a screw hole (not shown) is formed in a part of the other flange part 12b. On the other hand, the outer peripheral surface of the front end portion of the intermediate shaft 5 is a male serration portion 14. Further, an engaging convex portion 15 is formed at one place in the circumferential direction of the front end edge of the outer peripheral surface of the intermediate shaft 5. The engagement convex portion 15 is a portion of the front end portion of the intermediate shaft 5 where the engagement convex portion 15 is to be formed after the male serration portion 14 is formed on the outer peripheral surface of the front end portion of the intermediate shaft 5. The portions of the meat existing on both sides in the circumferential direction are gathered to the center by plastic deformation and raised outward in the radial direction.

上記中間シャフト5の前端部と上記一方のヨーク9とを結合する場合には、これに先立って、この一方のヨーク9の二股の先端部(図27の左下側端部)と他方のヨーク20の二股の先端部とを十字軸21(図26参照)を介して連結する事により、上記自在継手6を組み立てておく。そして、この状態で、先ず、上記中間シャフト5の前端部を上記シャフト取付部10の内側に挿入して、上記雄セレーション部14を上記雌セレーション部11に緩く(軸方向の相対変位可能に)セレーション係合させる。これと同時に、上記係合凸部15を上記シャフト取付部10の円周方向両端縁同士(上記両フランジ部12a、12b同士)の間に進入させる。又、この状態で、上記係合凸部15は、上記両フランジ部12a、12bに形成した通孔13及びねじ孔よりも、上記シャフト取付部10の軸方向奥側(上記中間シャフト5の前端部の挿入方向奥側で、図27の左下側)に配置しておく。次いで、上記通孔13にボルト16の杆部17を挿通すると共に、この杆部17の先半部に設けた雄ねじ部18を上記ねじ孔に螺合させ、更に上記ボルト16の頭部19を上記一方のフランジ部12aの外側面に当接させた状態で、このボルト16を締め付ける。これにより、上記両フランジ部12a、12b同士の間隔を狭めつつ、上記シャフト取付部10を縮径させる事で、上記雌セレーション部11と上記雄セレーション部14とを強くセレーション係合させる。この結果、上記中間シャフト5の前端部と上記一方のヨーク9とが、互いに結合固定される。   When the front end portion of the intermediate shaft 5 and the one yoke 9 are coupled, prior to this, a bifurcated tip end portion (lower left end portion in FIG. 27) of the one yoke 9 and the other yoke 20 are combined. The universal joint 6 is assembled by connecting the bifurcated tip of the two through a cross shaft 21 (see FIG. 26). In this state, first, the front end portion of the intermediate shaft 5 is inserted inside the shaft mounting portion 10, and the male serration portion 14 is loosened to the female serration portion 11 (allowing relative displacement in the axial direction). Engage with serration. At the same time, the engagement convex portion 15 is caused to enter between both circumferential edges of the shaft attachment portion 10 (the flange portions 12a and 12b). Further, in this state, the engagement convex portion 15 has the axially rear side of the shaft mounting portion 10 (the front end of the intermediate shaft 5) rather than the through hole 13 and the screw hole formed in the flange portions 12a and 12b. It is arranged on the back side in the insertion direction of the part on the lower left side in FIG. Next, the flange portion 17 of the bolt 16 is inserted into the through hole 13, the male screw portion 18 provided in the front half portion of the flange portion 17 is screwed into the screw hole, and the head portion 19 of the bolt 16 is further moved. The bolt 16 is tightened in a state where it is in contact with the outer surface of the one flange portion 12a. Accordingly, the female serration portion 11 and the male serration portion 14 are strongly engaged with each other by reducing the diameter of the shaft mounting portion 10 while narrowing the distance between the flange portions 12a and 12b. As a result, the front end portion of the intermediate shaft 5 and the one yoke 9 are coupled and fixed to each other.

尚、前述の図26に示したステアリング装置の様に、他方のヨーク20を入力シャフト8の上端部に溶接固定する構造を採用する場合、上述した中間シャフト5の前端部と一方のヨーク9との結合作業は、上記他方のヨーク20を上記入力シャフト8の上端部に溶接固定した状態で行う。これに対し、上記他方のヨーク20として、上記入力シャフト8の上端部にボルトにより結合固定できるもの(所謂横入れ式のヨーク等)を採用する場合、上述した中間シャフト5の前端部と一方のヨーク9との結合作業は、上記他方のヨーク20を上記入力シャフト8の上端部に結合する前に行う事ができる。この場合、後からこの他方のヨーク20を上記入力シャフト8の上端部に結合する作業を行う際には、上記中間シャフト5の前端部と上記一方のヨーク9との結合部を、仮止めの状態、即ち、上記通孔13に挿通したボルト16の雄ねじ部18をねじ孔に螺合させただけで、このボルト16を緩めたままの状態としておく。この仮止めの状態では、上記雌セレーション部11と上記雄セレーション部14とが緩くセレーション係合した状態となる為、上記中間シャフト5の前端部と上記一方のヨーク9とが軸方向に関してのみ、所定量だけ相対変位可能となる。具体的には、上記ボルト16の杆部17と上記係合凸部15とが係合する位置と、十字軸21と上記中間シャフト5の前端面とが当接する位置との間で、上記軸方向の相対変位が可能となる。従って、この様な軸方向の相対変位が可能となる分だけ、上記他方のヨーク20を上記入力シャフト8の上端部に結合する際の作業性を良好にできる。   When the structure in which the other yoke 20 is welded and fixed to the upper end portion of the input shaft 8 as in the steering device shown in FIG. 26 is employed, the front end portion of the intermediate shaft 5 and the one yoke 9 are The connecting operation is performed in a state where the other yoke 20 is fixed to the upper end portion of the input shaft 8 by welding. On the other hand, when the other yoke 20 is one that can be coupled and fixed to the upper end portion of the input shaft 8 with a bolt (a so-called horizontal insertion type yoke or the like), the front end portion of the intermediate shaft 5 described above and The connecting operation with the yoke 9 can be performed before the other yoke 20 is connected to the upper end of the input shaft 8. In this case, when the other yoke 20 is connected to the upper end portion of the input shaft 8 later, the connecting portion between the front end portion of the intermediate shaft 5 and the one yoke 9 is temporarily fixed. In this state, that is, by simply screwing the male screw portion 18 of the bolt 16 inserted into the through hole 13 into the screw hole, the bolt 16 is left loose. In this temporarily fixed state, since the female serration portion 11 and the male serration portion 14 are loosely engaged with the serration, the front end portion of the intermediate shaft 5 and the one yoke 9 are only in the axial direction. Relative displacement is possible by a predetermined amount. Specifically, the axis between the position at which the flange 17 of the bolt 16 and the engaging projection 15 are engaged and the position at which the cross shaft 21 and the front end surface of the intermediate shaft 5 abut. A relative displacement in the direction is possible. Therefore, workability when the other yoke 20 is coupled to the upper end portion of the input shaft 8 can be improved by the amount that enables such relative displacement in the axial direction.

何れにしても、上述した中間シャフト5の前端部と一方のヨーク9との結合部の場合には、上記他方のヨーク20を上記入力シャフト8の上端部に結合する作業時に限らず、自動車の運転時に万一、上記ボルト16が緩んで仮止めの状態になった場合でも、このボルト16の杆部17に上記係合凸部15が係合する事によって、上記中間シャフト5の前端部が上記一方のヨーク9のシャフト取付部10の内側から基端側に抜け出る事を防止できる。   In any case, in the case of the connecting portion between the front end portion of the intermediate shaft 5 and one yoke 9 described above, it is not limited to the operation of connecting the other yoke 20 to the upper end portion of the input shaft 8, and Even if the bolt 16 is loosened and temporarily fixed during operation, the front end of the intermediate shaft 5 is moved by engaging the engaging projection 15 with the flange 17 of the bolt 16. It is possible to prevent the one yoke 9 from slipping out from the inside of the shaft mounting portion 10 to the base end side.

ところで、上述した従来構造の場合、上記中間シャフト5の前端部と上記一方のヨーク9とを結合固定する状態で、上記係合凸部15の幅寸法Wは、上記シャフト取付部10の円周方向両端縁同士(上記両フランジ部12a、12b同士)の間隔Dと等しくする必要はない。但し、上記中間シャフト5の前端部と上記一方のヨーク9との円周方向に関する位相合わせの精度を良好にする観点より、上記幅寸法Wは、上記間隔Dに極力近づけるのが好ましい。ところが、上述した従来構造の場合には、上記一方のヨーク9として上記間隔Dが広いものを採用する場合に、これに合わせて上記係合凸部15の幅寸法Wを大きくする事が難しい。この理由は、設計段階で定める上記係合凸部15の幅寸法Wを大きくする程、この係合凸部15を形成すべき部分の円周方向両側に存在する肉(この係合凸部15の材料となる肉)の量が減り、この肉の量の不足を招き易い為である。又、他の理由としては、上記係合凸部15の幅寸法Wの増大に伴う、この係合凸部15の加工力の増加割合が非常に大きくなる為であり、この大きくなった加工力によって、加工部位の周囲部分に好ましくない変形が生じる可能性がある為である。   By the way, in the case of the conventional structure described above, the width dimension W of the engaging projection 15 is the circumference of the shaft mounting portion 10 in a state where the front end portion of the intermediate shaft 5 and the one yoke 9 are coupled and fixed. It is not necessary to make it equal to the space | interval D of the direction both-ends edges (both said flange parts 12a and 12b). However, it is preferable that the width dimension W is as close as possible to the distance D from the viewpoint of improving the phase alignment accuracy in the circumferential direction between the front end portion of the intermediate shaft 5 and the one yoke 9. However, in the case of the above-described conventional structure, it is difficult to increase the width dimension W of the engaging convex portion 15 in accordance with this when the one yoke 9 having a large distance D is employed. The reason for this is that as the width W of the engaging projection 15 determined at the design stage is increased, the flesh present on both sides in the circumferential direction of the portion where the engaging projection 15 is to be formed (this engaging projection 15 This is because the amount of meat) becomes a material, and the amount of meat tends to be insufficient. Another reason is that the increasing rate of the processing force of the engaging convex portion 15 with the increase in the width dimension W of the engaging convex portion 15 becomes very large. This is because undesired deformation may occur in the peripheral portion of the processing site.

特開2000−249157号公報JP 2000-249157 A

本発明のシャフトと自在継手のヨークとの結合部及びシャフトの製造方法は、上述の様な事情に鑑み、ヨークとしてシャフト取付部の円周方向両端縁同士(1対のフランジ部同士)の間隔が広いものを採用する場合に、これに合わせてシャフトの一端部に設ける係合凸部の幅寸法を大きくする事が容易な構造及びその製造方法を実現すべく発明したものである。   In view of the above-described circumstances, the shaft connecting portion between the shaft and the universal joint yoke and the shaft manufacturing method according to the present invention are spaced from each other in the circumferential direction of the shaft mounting portion as a yoke (a pair of flange portions). The invention has been invented in order to realize a structure and a manufacturing method thereof that can easily increase the width dimension of the engaging projection provided at one end of the shaft in accordance with this.

本発明のうち、請求項1〜2に記載したシャフトと自在継手のヨークとの結合部は、自在継手のヨークと、シャフトと、ボルトとを備える。
このうちのヨークは、円周方向1個所に不連続部を有する筒状のシャフト取付部と、このシャフト取付部の円周方向両端縁に連続する状態で互いにほぼ平行に設けられた1対のフランジ部と、これら両フランジ部のうちの一方のフランジ部に設けられた通孔と、他方のフランジ部に(直接又はナット等の他の部材を介して)この通孔と同心に設けられたねじ孔とを有する。
又、上記シャフトは、一端部外周面の円周方向1個所に係合凸部を有する。そして、一端部を上記シャフト取付部の内側に挿入すると共に、この係合凸部を、このシャフト取付部の円周方向両端縁同士(上記両フランジ部同士)の間部分で、且つ、上記通孔及びねじ孔よりも上記シャフト取付部の軸方向奥側部分に配置している。
又、上記ボルトは、少なくとも先端部に雄ねじ部を設けた杆部と、この杆部の基端部に存在する頭部とを有する。そして、このうちの杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合し、更に締め付ける事で、上記シャフト取付部に対し上記シャフトの一端部を結合している。
又、上記ボルトの杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合し、且つ、上記ボルトを締め付けていない、仮止めの状態でも、上記シャフト取付部の内側から上記シャフトの一端部が他端側に抜け出る事を、上記ボルトの杆部と上記係合凸部との係合に基づいて阻止できる様にしている。
In the present invention, the connecting portion between the shaft and the universal joint yoke described in claims 1 and 2 includes the universal joint yoke, the shaft, and a bolt.
Among these, the yoke is a pair of cylindrical shaft mounting portions having a discontinuous portion at one circumferential direction, and a pair of substantially parallel to each other in a state of being continuous with both circumferential edges of the shaft mounting portion. The flange portion, a through hole provided in one of the two flange portions, and the other flange portion (directly or via another member such as a nut) are provided concentrically with the through hole. And a screw hole.
The shaft has an engaging convex portion at one location in the circumferential direction on the outer peripheral surface of the one end portion. And while inserting one end part inside the said shaft attachment part, this engagement convex part is the part between the circumferential direction both ends edges (the above-mentioned both flange parts) of this shaft attachment part, and the said passage. It arrange | positions in the axial direction back | inner side part of the said shaft attaching part rather than a hole and a screw hole.
Moreover, the said bolt has a collar part which provided the external thread part in the front-end | tip part at least, and the head which exists in the base end part of this collar part. And while inserting the collar part of the inside of the through hole, screwing the male screw part into the screw hole, and further tightening, the one end part of the shaft is coupled to the shaft attaching part. Yes.
In addition, the shaft mounting portion is inserted even when the flange portion of the bolt is inserted into the through hole, the male screw portion is screwed into the screw hole, and the bolt is not tightened. It is made possible to prevent the end of the shaft from slipping out from the inside to the other end based on the engagement between the flange portion of the bolt and the engagement convex portion.

特に、請求項1に記載したシャフトと自在継手のヨークとの結合部に於いては、上記シャフトは、少なくとも一端部を筒部としている。又、上記係合凸部は、この筒部の先端部の円周方向一部分を、当該部分の円周方向両側部分から切り離した状態で、径方向外方に向け塑性的に曲げ起こして形成したものである。   In particular, in the connecting portion between the shaft and the yoke of the universal joint described in claim 1, the shaft has at least one end as a cylindrical portion. Further, the engaging convex part is formed by plastically bending outward in the radial direction in a state where a circumferential part of the tip part of the cylindrical part is separated from both circumferential parts of the part. Is.

これに対し、請求項2に記載したシャフトと自在継手のヨークとの結合部に於いては、上記シャフトは、一端寄り部外周面の円周方向1個所に凹溝を形成している。又、上記係合凸部は、この凹溝と上記シャフトの一端面との間部分に存在する肉を、このシャフトの軸方向に押し潰して、径方向外方に***させる事により形成したものである。
更に、上記請求項1〜2に記載したシャフトと自在継手のヨークとの結合部に於いては、上記シャフトは、外周面の一端寄り部の円周方向一部分に、この外周面から径方向内方に凹入した係合凹部を、この外周面の一端縁部のうちでこの係合凹部と円周方向同位相の部分に、この外周面から径方向外方に突出した上記係合凸部を、それぞれ形成している。又、上記ボルトは、上記杆部の基端側部分を円柱部とし、同じく先端側部分をこの円柱部に比較して小径の上記雄ねじ部としたものであり、上記杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合した状態で、この雄ねじ部は、この雄ねじ部のこのねじ孔に対する螺入量の大きさに拘らず、上記係合凹部内に進入しないものであり、同じく上記円柱部は、上記螺入量を所定の大きさ以上とした場合にのみ、上記係合凹部内に進入するものである。又、上記ボルトの杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合し、且つ、上記ボルトを締め付けていない状態でも、上記円柱部が上記係合凹部内に進入している場合には、これら円柱部と係合凹部の一端縁との係合に基づいて、同じく進入していない場合には、上記雄ねじ部と上記係合凸部との係合に基づいて、それぞれ上記シャフト取付部の内側から上記シャフトの一端部が他端側に抜け出る事を防止できる様にしている。
On the other hand, in the joint portion between the shaft and the universal joint yoke described in claim 2, the shaft has a concave groove formed in one circumferential direction on the outer peripheral surface near the one end. Further, the engaging convex portion is formed by crushing the meat existing in the portion between the concave groove and the one end surface of the shaft in the axial direction of the shaft and raising it outward in the radial direction. It is.
Further, in the joint portion between the shaft and the universal joint yoke according to the first or second aspect, the shaft is radially inward from the outer peripheral surface at a portion in the circumferential direction near the one end of the outer peripheral surface. The engaging convex part that protrudes radially outward from the outer peripheral surface is formed in the circumferentially in-phase part of the engaging concave part at one end edge of the outer peripheral surface. Are formed respectively. In addition, the bolt has a cylindrical portion as a proximal end portion of the flange portion and a male screw portion having a diameter smaller than that of the cylindrical portion, and the flange portion of the through hole. With the male screw portion inserted into the screw hole and screwed into the screw hole, the male screw portion enters the engagement recess regardless of the amount of the male screw portion screwed into the screw hole. Similarly, the cylindrical portion enters the engaging recess only when the screwing amount is not less than a predetermined size. Further, the cylindrical portion is inserted into the engagement recess even when the flange portion of the bolt is inserted into the through hole, the male screw portion is screwed into the screw hole, and the bolt is not tightened. In the case of entering, the engagement between the male threaded portion and the engaging convex portion is based on the engagement between the cylindrical portion and one end edge of the engaging recess. Based on this, it is possible to prevent the one end of the shaft from slipping out from the inside of the shaft mounting portion to the other end.

又、本発明のうち、請求項3に記載した製造方法の対象となるシャフトは、上記請求項1に記載したシャフトと自在継手のヨークとの結合部を構成するシャフトである。この様な請求項3に記載したシャフトの製造方法は、少なくとも一端部を筒部としたシャフト中間体を造った後、この筒部の先端部の円周方向一部分に治具を軸方向に押し付けつつ、当該部分に径方向外方に向く力を加える事で、当該部分の円周方向両側部分を切り裂きながら、当該部分を径方向外方に向け塑性的に曲げ起こして係合凸部を形成する。   In the present invention, the shaft to be subjected to the manufacturing method described in claim 3 is a shaft constituting a connecting portion between the shaft described in claim 1 and the yoke of the universal joint. In such a method for manufacturing a shaft according to claim 3, after a shaft intermediate body having at least one end portion as a cylindrical portion is formed, a jig is pressed in the circumferential direction at a tip portion of the cylindrical portion in the axial direction. On the other hand, by applying a radially outward force to the part, the two parts in the circumferential direction of the part are torn, and the part is plastically bent radially outward to form an engaging convex part. To do.

又、本発明のうち、請求項4に記載した製造方法の対象となるシャフトは、上記請求項2に記載したシャフトと自在継手のヨークとの結合部を構成するシャフトである。この様な請求項4に記載したシャフトの製造方法は、一端寄り部外周面の円周方向1個所に凹溝を形成したシャフト中間体を造った後、この凹溝とこのシャフト中間体の一端面との間部分に存在する肉を、1対の治具により、このシャフト中間体の軸方向に押し潰して径方向に***させる事で係合凸部を形成する。   In addition, among the present invention, the shaft to be subjected to the manufacturing method described in claim 4 is a shaft constituting a connecting portion between the shaft described in claim 2 and the yoke of the universal joint. In such a shaft manufacturing method according to the fourth aspect of the present invention, after a shaft intermediate body having a concave groove formed in one circumferential direction on the outer peripheral surface near the one end is formed, the concave groove and one of the shaft intermediate bodies are formed. Engagement convex portions are formed by crushing the meat existing between the end faces in the axial direction of the shaft intermediate body by means of a pair of jigs and raising them in the radial direction.

上述した様な本発明のシャフトと自在継手のヨークとの結合部及びシャフトの製造方法の場合には、前述の図27に示した従来構造の場合と異なり、設計段階で定める係合凸部の円周方向の幅寸法を大きくする事に伴って、この係合凸部を形成する為の肉が減少する事はない。又、前述の図27に示した従来構造の場合と比べて、係合凸部の加工力を小さくできる為、余程幅広の係合凸部を形成しない限り、この加工力によって加工部位の周囲部分を変形させにくくできる。従って、ヨークを構成するシャフト取付部の円周方向両端縁同士(1対のフランジ部同士)の間隔が広く、これに合わせて、設計段階で定める上記係合凸部の円周方向の幅寸法を大きくする場合でも、この係合凸部を形成する事が容易となる。更に、請求項1、3に記載した発明の場合には、シャフトの一端部に設けた筒部の円周方向一部分を径方向外方に向け塑性的に曲げ起こして係合凸部を形成する為、前述の図27に示した従来構造の場合と比べて、この係合凸部の高さ寸法を大きくする事が容易となる。   In the case of the connecting portion between the shaft of the present invention and the yoke of the universal joint and the manufacturing method of the shaft as described above, unlike the conventional structure shown in FIG. As the width dimension in the circumferential direction is increased, the meat for forming the engaging projections does not decrease. In addition, since the processing force of the engaging convex portion can be reduced as compared with the case of the conventional structure shown in FIG. 27, unless the engaging convex portion is formed to be too wide, the processing force is used to surround the processing portion. It is difficult to deform the part. Therefore, the interval between the circumferential edges (a pair of flange portions) of the shaft mounting portion constituting the yoke is wide, and the width dimension in the circumferential direction of the engagement convex portion determined at the design stage according to this is wide. Even in the case of increasing the size, it becomes easy to form the engaging convex portion. Further, in the case of the inventions described in claims 1 and 3, the engagement convex portion is formed by plastically bending a circumferential portion of the cylindrical portion provided at one end portion of the shaft outward in the radial direction. Therefore, it is easy to increase the height dimension of the engaging projection as compared with the case of the conventional structure shown in FIG.

[実施の形態の第1例]
図1〜11は、請求項1、3に対応する、本発明の実施の形態の第1例を示している。先ず、図1は、本発明によるシャフトと自在継手のヨークとの結合部を組み込んだ、ステアリング装置用回転伝達装置を示している。この回転伝達装置は、中間シャフト5aの前端部(図1の左端部)に一方の自在継手6aを、後端部(図1の右端部)に他方の自在継手4を、それぞれ結合して成る。これら両自在継手6a(4)はそれぞれ、1対のヨーク9a、20a(22、23)の二股の先端部同士を、十字軸21を介して連結する事により構成した、カルダン継手と呼ばれるものである。この様な回転伝達装置のうち、上記一方の自在継手6aを構成する一方(図1の右方)のヨーク9aと、上記中間シャフト5aとの結合部が、本発明の構造となっている。
[First example of embodiment]
FIGS. 1-11 has shown the 1st example of embodiment of this invention corresponding to Claim 1,3. First, FIG. 1 shows a rotation transmission device for a steering device incorporating a coupling portion between a shaft and a universal joint yoke according to the present invention. This rotation transmission device is formed by connecting one universal joint 6a to the front end (left end in FIG. 1) of the intermediate shaft 5a and the other universal joint 4 to the rear end (right end in FIG. 1). . Each of these universal joints 6a (4) is called a cardan joint formed by connecting the forked ends of a pair of yokes 9a, 20a (22, 23) via a cross shaft 21. is there. In such a rotation transmission device, a coupling portion between one yoke 9a (right side in FIG. 1) constituting the one universal joint 6a and the intermediate shaft 5a has the structure of the present invention.

上記結合部は、結合完了後の状態を図1〜3に、仮止めの状態を図4〜5に、それぞれ示す様に、上記中間シャフト5aと、上記一方のヨーク9aと、ボルト16aとを備える。このうちの中間シャフト5aは、円筒状のアウターシャフト24の前端部を、円柱状のインナーシャフト25の後端部に、回転力の伝達を可能に、且つ、所定の大きさを越える軸方向荷重(コラプス荷重)が作用した場合にのみ軸方向の相対変位を可能に外嵌して成る。この為に具体的には、上記前端部と上記後端部とを、所定の締め代を持たせた状態でセレーション嵌合させている。この様な中間シャフト5aを構成する、上記アウターシャフト24は、上記他方の自在継手4を構成する一方(図1の左方)のヨーク22と一体に形成すると共に、内周面を雌セレーション部(図示せず)としている。これに対し、上記インナーシャフト25は、図6〜9に詳示する様に、外周面のうちで、次述する係合凹部27及び係合凸部15a以外の部分を、上記雌セレーション部に対し所定の締め代を持ってセレーション係合可能な、雄セレーション部26としている。又、この外周面の前端寄り部の円周方向一部分に、この外周面から径方向内方に凹入した、軸方向に長い係合凹部27を、この外周面の前端縁部のうちでこの係合凹部27と円周方向同位相の部分に、この外周面から径方向外方に突出した係合凸部15aを、それぞれ形成している。又、このインナーシャフト25の両端部は、それぞれ中心部に円孔28、29を形成した円筒部30、31としている。 As shown in FIGS. 1 to 3 and FIGS. 4 to 5 in a temporarily fixed state, the connecting portion includes the intermediate shaft 5a, the one yoke 9a, and the bolt 16a. Prepare. Among these, the intermediate shaft 5a is capable of transmitting rotational force to the rear end portion of the cylindrical inner shaft 25 from the front end portion of the cylindrical outer shaft 24 and has an axial load exceeding a predetermined size. Only when a (collapse load) is applied, it is fitted so as to allow relative displacement in the axial direction. For this purpose, specifically, the front end portion and the rear end portion are serrated and fitted with a predetermined tightening allowance. The outer shaft 24 constituting the intermediate shaft 5a is integrally formed with one yoke 22 (left side in FIG. 1) constituting the other universal joint 4, and the inner peripheral surface thereof is a female serration portion. (Not shown). On the other hand, as shown in detail in FIGS. 6 to 9, the inner shaft 25 has a portion other than the engagement concave portion 27 and the engagement convex portion 15 a described below in the outer peripheral surface as the female serration portion. On the other hand, a male serration portion 26 that can engage with serration with a predetermined tightening margin is provided. Further, in the circumferential direction a portion near the front end portion of the outer peripheral surface, and recessed from the outer peripheral surface radially inwardly, the long engagement recess 27 in the axial direction, this among the front end edge portion of the outer peripheral surface Engagement convex portions 15a projecting radially outward from the outer peripheral surface are formed at portions in the same phase in the circumferential direction as the engagement concave portions 27, respectively. Further, both end portions of the inner shaft 25 are formed as cylindrical portions 30 and 31 in which circular holes 28 and 29 are formed at the center portions, respectively.

本例の場合、上記係合凹部27は、上記雄セレーション部26を形成した後に、フライス加工により形成する。又、上記係合凸部15aは、これら雄セレーション部26及び係合凹部27と、上記両円筒部30、31とを形成したシャフト中間体を造った後、図10〜11に示す様に、受け治具32と押し付け治具33とを使用して形成する。このうちの受け治具32は、円筒部34と、この円筒部34の基端開口を塞ぐ底板部35と、この円筒部34の内径側でこの底板部35の内側面から突出する、この円筒部34と同心の円柱部36とを備える。又、上記押し付け治具33は、円柱部37と、この円柱部37の軸方向中間部外周面の円周方向一部分に突設した押し付け部38とを備える。この押し付け部38は、上記円柱部37の中心軸を含む仮想平面の両側に広がる所定厚さの空間内に存在する、板状の部位である。又、この押し付け部38のうち、上記円柱部37の先端側(図10〜11の右側)の側面を、この円柱部37の径方向外方に向かう程この円柱部37の基端側(図10〜11の左側)に向かう方向に傾斜した、傾斜面39としている。   In the case of this example, the engaging recess 27 is formed by milling after the male serration portion 26 is formed. In addition, the engaging convex portion 15a is formed as a shaft intermediate body in which the male serration portion 26 and the engaging concave portion 27 and the cylindrical portions 30 and 31 are formed, as shown in FIGS. It forms using the receiving jig | tool 32 and the pressing jig | tool 33. FIG. The receiving jig 32 includes a cylindrical portion 34, a bottom plate portion 35 that closes the base end opening of the cylindrical portion 34, and an inner surface of the cylindrical portion 34 that protrudes from the inner surface of the bottom plate portion 35. A portion 34 and a concentric cylindrical portion 36. The pressing jig 33 includes a cylindrical portion 37 and a pressing portion 38 that protrudes from a part of the outer peripheral surface in the axial direction of the cylindrical portion 37 in the circumferential direction. The pressing portion 38 is a plate-like portion that exists in a space having a predetermined thickness that spreads on both sides of a virtual plane including the central axis of the cylindrical portion 37. Further, of the pressing portion 38, the side surface on the distal end side (the right side in FIGS. 10 to 11) of the cylindrical portion 37 is closer to the proximal end side (see FIG. The inclined surface 39 is inclined in a direction toward the left side of 10 to 11.

上記受け治具32と上記押し付け治具33とを使用して、上記係合凸部15aを形成する場合には、図10に示す様に、上記受け治具32により、上記インナーシャフト25(上記シャフト中間体)の後端部を、径方向及び軸方向の位置決めを図った状態で支持する。この為に具体的には、上記受け治具32を構成する円筒部34の内側に、上記インナーシャフト25の後端部を、大きながたつきなく(空気が通れる程度の微小隙間を介して)挿入する。これと共に、このインナーシャフト25の後端部に設けた円筒部31(円孔29)の内側に、上記受け治具32を構成する円柱部36を、大きながたつきなく挿入し、この円柱部36の先端部を上記円筒部31の奥端部に突き当てた状態とする。そして、この状態で、上記インナーシャフト25の前端部に設けた円筒部30(円孔28)の内側に、上記押し付け治具33を構成する円柱部37の先端部を、大きながたつきなく押し込みながら、上記円筒部30の先端縁部のうちで円周方向に関して上記係合凹部27と同位相の部分に、上記押し付け治具33を構成する押し付け部38の傾斜面39を押し付ける。これにより、当該部分に径方向外方に向く力を加える事で、当該部分の円周方向両側部分を切り裂きながら、当該部分を上記傾斜面39に沿って径方向外方に向け塑性的に曲げ起こす。そして、この様に曲げ起こした部分を、上記係合凸部15aとする。尚、上記受け治具32の底板部35及び円柱部36の中心部と、上記押し付け治具33の円柱部37の中心部とに、それぞれ当該部分を軸方向に貫通する通気孔を形成する事もできる。この様な通気孔を形成すれば、上記受け治具32の内側に上記インナーシャフト25の後端部を挿入する作業、並びに、上記押し付け治具33の円柱部37の先端部を上記インナーシャフト25の前端部の内側に押し込む作業を、内部空気圧の上昇を抑制若しくは回避しつつ、円滑に行える。   When the engagement protrusion 15a is formed using the receiving jig 32 and the pressing jig 33, the receiving shaft 32 (the inner shaft 25 (the above-mentioned) is used as shown in FIG. The rear end portion of the shaft intermediate body) is supported in a state where positioning in the radial direction and the axial direction is achieved. For this purpose, specifically, the rear end portion of the inner shaft 25 is placed on the inner side of the cylindrical portion 34 constituting the receiving jig 32 without large backlash (via a minute gap that allows air to pass through). insert. At the same time, a cylindrical portion 36 constituting the receiving jig 32 is inserted into the cylindrical portion 31 (circular hole 29) provided at the rear end portion of the inner shaft 25 without large backlash. The tip end portion of 36 is brought into contact with the back end portion of the cylindrical portion 31. In this state, the tip end of the columnar portion 37 constituting the pressing jig 33 is pushed into the inner side of the cylindrical portion 30 (circular hole 28) provided at the front end portion of the inner shaft 25 without large backlash. However, the inclined surface 39 of the pressing portion 38 constituting the pressing jig 33 is pressed against a portion of the front end edge of the cylindrical portion 30 that is in phase with the engaging recess 27 in the circumferential direction. Thus, by applying a radially outward force to the portion, the portion is plastically bent radially outward along the inclined surface 39 while tearing off both circumferential portions of the portion. Wake up. And the part bent up like this is made into the said engagement convex part 15a. A vent hole is formed in the central portion of the bottom plate portion 35 and the cylindrical portion 36 of the receiving jig 32 and the central portion of the cylindrical portion 37 of the pressing jig 33 in the axial direction. You can also. If such a vent hole is formed, the operation of inserting the rear end portion of the inner shaft 25 inside the receiving jig 32 and the front end portion of the cylindrical portion 37 of the pressing jig 33 are connected to the inner shaft 25. It is possible to smoothly push the inside of the front end portion while suppressing or avoiding an increase in internal air pressure.

又、前記一方のヨーク9aは、前述の図27に示した従来構造のヨーク9と同様、基半部(図1、2、4の右半部)に、円周方向1個所に不連続部を有する欠円筒状のシャフト取付部10を設けている。又、このシャフト取付部10の内周面は、上記インナーシャフト25の外周面に設けた雄セレーション部26とセレーション係合可能な、雌セレーション部11としている。又、このシャフト取付部10の円周方向両端縁には、互いに平行な1対のフランジ部12c、12dを設けている。そして、このうちの一方のフランジ部12cの一部に比較的大径の通孔13aを、他方のフランジ部12dの一部に比較的小径のねじ孔40を、それぞれ互いに同心に形成している。   Also, the one yoke 9a is discontinuous at one place in the circumferential direction in the base half (the right half in FIGS. 1, 2, and 4), like the yoke 9 of the conventional structure shown in FIG. A semi-cylindrical shaft mounting portion 10 having the following structure is provided. The inner peripheral surface of the shaft mounting portion 10 is a female serration portion 11 that can be serrated and engaged with a male serration portion 26 provided on the outer peripheral surface of the inner shaft 25. Further, a pair of flange portions 12c and 12d parallel to each other are provided at both circumferential edges of the shaft mounting portion 10. A relatively large-diameter through hole 13a is formed in a part of one of the flange parts 12c, and a relatively small-diameter screw hole 40 is formed in a part of the other flange part 12d. .

又、前記ボルト16aは、杆部17aと、この杆部17aの基端部に存在する頭部19aとを備える。このうちの杆部17aは、基端部を比較的大径の円柱部41とし、先半部を比較的小径の雄ねじ部18aとしている。更に、上記杆部17aの外周面のうちで、これら円柱部41と雄ねじ部18aとの間に存在する部分を、この雄ねじ部18aの側に向かう程外径寸法が小さくなる方向に傾斜したテーパ面部42としている。又、上記頭部19aの外周面のうちで上記杆部17a側の端部に、外向フランジ状の鍔部43を形成している。   The bolt 16a includes a flange portion 17a and a head portion 19a existing at the base end portion of the flange portion 17a. Of these, the flange portion 17a has a base end portion as a relatively large diameter cylindrical portion 41 and a tip half portion as a relatively small diameter male screw portion 18a. Further, a portion of the outer peripheral surface of the flange portion 17a, which is between the cylindrical portion 41 and the male screw portion 18a, is inclined so that the outer diameter decreases toward the male screw portion 18a. The surface portion 42 is used. Further, an outward flange-like flange portion 43 is formed at the end portion on the flange portion 17a side of the outer peripheral surface of the head portion 19a.

本例の場合、図1〜3に示す様に、前記中間シャフト5aを構成するインナーシャフト25の前端部と、上記一方のヨーク9aとを結合固定する作業を行う場合には、これに先立って、前記両自在継手4、6aと上記中間シャフト5aとを、それぞれ組み立てておく。そして、この状態で、先ず、上記インナーシャフト25の前端部を上記一方のヨーク9aのシャフト取付部10の内側に挿入して、この前端部外周面の雄セレーション部26を、このシャフト取付部10の内周面の雌セレーション部11に緩く(軸方向の相対変位可能に)セレーション係合させる。これと同時に、上記インナーシャフト25の前端部外周面に設けた係合凸部15aを、上記一方のヨーク9aを構成するシャフト取付部10の円周方向両端縁同士の間に進入させる事で、上記インナーシャフト25と上記一方のヨーク9aとの円周方向の位相を合わせる。又、この状態で、上記係合凸部15aを、上記両フランジ部12c、12dに形成した通孔13a及びねじ孔40よりも、上記シャフト取付部10の軸方向奥側(上記インナーシャフト25の前端部の挿入方向奥側で、図2、4の左側)に配置する。これと共に、上記インナーシャフト25の外周面の前端寄り部分に設けた軸方向に長い係合凹部27の一部と、上記通孔13a及びねじ孔40との、軸方向の位相を一致させる。   In the case of this example, as shown in FIGS. 1 to 3, prior to this, when the work of connecting and fixing the front end portion of the inner shaft 25 constituting the intermediate shaft 5a and the one yoke 9a is performed. The universal joints 4 and 6a and the intermediate shaft 5a are respectively assembled. In this state, first, the front end portion of the inner shaft 25 is inserted inside the shaft attachment portion 10 of the one yoke 9a, and the male serration portion 26 on the outer peripheral surface of the front end portion is inserted into the shaft attachment portion 10. Is loosely engaged with the female serration portion 11 on the inner peripheral surface (so that relative displacement in the axial direction is possible). At the same time, by causing the engagement convex portion 15a provided on the outer peripheral surface of the front end portion of the inner shaft 25 to enter between the circumferential end edges of the shaft mounting portion 10 constituting the one yoke 9a, The phases of the inner shaft 25 and the one yoke 9a in the circumferential direction are matched. Further, in this state, the engagement convex portion 15a is connected to the axially rear side of the shaft mounting portion 10 (the inner shaft 25 of the inner shaft 25) with respect to the through hole 13a and the screw hole 40 formed in the both flange portions 12c and 12d. It arrange | positions in the insertion direction back | inner side of a front-end part on the left side of FIG. At the same time, the axial phase of a part of the engagement recess 27 long in the axial direction provided in the portion near the front end of the outer peripheral surface of the inner shaft 25 is matched with the through hole 13a and the screw hole 40.

次いで、図3に詳示する様に、上記通孔13aに上記ボルト16aの円柱部41をがたつきなく挿通すると共に、上記ねじ孔40に上記ボルト16aの雄ねじ部18aを螺合する。更に、このボルト16aの頭部19aを上記一方のフランジ部12cの外側面に当接させると共に、このボルト16aの円柱部41及びテーパ面部42を上記インナーシャフト25の係合凹部27内に進入させた状態で、このボルト16aを締め付ける。これにより、上記両フランジ部12c、12d同士の間隔を狭めつつ、上記シャフト取付部10を縮径させる事で、上記雌セレーション部11と上記雄セレーション部26とを強くセレーション係合させる。この結果、上記インナーシャフト25の前端部と上記一方のヨーク9aとが、互いに結合固定される。 Next, as shown in detail in FIG. 3, the cylindrical portion 41 of the bolt 16 a is inserted into the through hole 13 a without rattling, and the male screw portion 18 a of the bolt 16 a is screwed into the screw hole 40. Further, the head portion 19a of the bolt 16a is brought into contact with the outer surface of the one flange portion 12c, and the cylindrical portion 41 and the tapered surface portion 42 of the bolt 16a are caused to enter the engagement recess 27 of the inner shaft 25. In this state, the bolt 16a is tightened. Thus, the female serration portion 11 and the male serration portion 26 are strongly serrated by reducing the diameter of the shaft mounting portion 10 while narrowing the distance between the flange portions 12c and 12d. As a result, the front end portion of the inner shaft 25 and the one yoke 9a are coupled and fixed to each other.

又、図1〜3に示す様な回転伝達装置を車両に組み付ける場合には、例えば、先ず、前記他方の自在継手4を構成する他方(図1の右方)のヨーク23を、ステアリングシャフト2(図26参照)の前端部に結合固定(図示の構造の場合には溶接固定)しておく。そして、前記一方の自在継手6aを構成する他方(図1の左方)のヨーク20aを、入力シャフト8(図26参照)の上端部に結合固定する。具体的には、この他方のヨーク20aの基端部の内側にこの入力シャフト8の上端部を配置した状態で、図示しないボルトにより、これら基端部と上端部とを結合固定する。本例の場合、この結合作業を行う際には、上記インナーシャフト25の前端部と上記一方のヨーク9aとの結合部を、図4〜5に示す様な仮止め状態とする。即ち、上記雄ねじ部18aを上記ねじ孔40に螺合させたまま、上記ボルト16aを緩める事により、図5に示す様に、上記ボルト16aの円柱部41及びテーパ面部42を、上記一方のフランジ部12cの通孔13a内に退避させる。これにより、これら円柱部41及びテーパ面部42が上記インナーシャフト25の係合凹部27内に進入していない状態(上記ボルト16aの雄ねじ部18aが上記インナーシャフト25の雄セレーション部26に乗り上げ可能になる状態)とする。尚、本例の場合、上記円柱部41及びテーパ面部42は、図3、5から明らかな様に、上記雄ねじ部18aの上記ねじ孔40に対する螺入量を、所定の大きさ(図5に示した大きさよりも、若干増加させた大きさ)以上とした場合にのみ、上記係合凹部27内に進入する。これに対し、上記雄ねじ部18aは、図2〜5から明らかな様に、上記螺入量の大きさに拘らず、上記係合凹部27内に進入しない。何れにしても、上述した仮止めの状態では、上記雌セレーション部11と上記雄セレーション部26とが緩くセレーション係合した状態となる為、上記インナーシャフト25の前端部と上記一方のヨーク9aとが軸方向に関してのみ、所定量だけ相対変位可能となる。具体的には、図4に仮想線(二点差線)で示す様に、上記インナーシャフト25の前端部外周面に設けた係合凸部15aが、上記ボルト16aの雄ねじ部18aと係合する位置と、上記インナーシャフト25の前端面が前記十字軸21に当接する位置との間で、上記軸方向の相対変位が可能となる。従って、この様な軸方向の相対変位が可能となる分だけ、上記他方のヨーク20aを上記入力シャフト8の上端部に結合する際の作業性を良好にできる。 When the rotation transmission device as shown in FIGS. 1 to 3 is assembled to a vehicle, for example, first, the other yoke 23 (right side in FIG. 1) constituting the other universal joint 4 is connected to the steering shaft 2. It is fixed to the front end of (see FIG. 26) and fixed (welded in the case of the structure shown). Then, the other (left side in FIG. 1) yoke 20a constituting the one universal joint 6a is coupled and fixed to the upper end portion of the input shaft 8 (see FIG. 26). Specifically, in a state where the upper end portion of the input shaft 8 is disposed inside the base end portion of the other yoke 20a, the base end portion and the upper end portion are coupled and fixed by a bolt (not shown). In the case of this example, when performing this connecting operation, the connecting portion between the front end portion of the inner shaft 25 and the one yoke 9a is set in a temporarily fixed state as shown in FIGS. That is, by loosening the bolt 16a while the male screw portion 18a is screwed into the screw hole 40, the cylindrical portion 41 and the tapered surface portion 42 of the bolt 16a are moved to the one flange as shown in FIG. It retracts in the through hole 13a of the portion 12c. As a result, the cylindrical portion 41 and the tapered surface portion 42 do not enter the engagement recess 27 of the inner shaft 25 (the male screw portion 18a of the bolt 16a can ride on the male serration portion 26 of the inner shaft 25). State). In the case of this example, as is apparent from FIGS. 3 and 5, the cylindrical portion 41 and the tapered surface portion 42 have a predetermined amount (see FIG. 5) of the amount of screwing of the male screw portion 18a into the screw hole 40. Only when the size is slightly larger than the indicated size), the engagement recess 27 is entered. On the other hand, as is apparent from FIGS. 2 to 5, the male screw portion 18 a does not enter the engaging recess 27 regardless of the amount of screwing. In any case, since the female serration portion 11 and the male serration portion 26 are loosely engaged with each other in the temporarily fixed state described above, the front end portion of the inner shaft 25 and the one yoke 9a However, only in the axial direction can be relatively displaced by a predetermined amount. Specifically, as shown by the phantom line (two-dotted line) in FIG. 4, the engagement convex portion 15a provided on the outer peripheral surface of the front end portion of the inner shaft 25 engages with the male screw portion 18a of the bolt 16a. The relative displacement in the axial direction is possible between the position and the position where the front end surface of the inner shaft 25 contacts the cross shaft 21. Therefore, the workability when the other yoke 20a is coupled to the upper end portion of the input shaft 8 can be improved by such an amount that the relative displacement in the axial direction is possible.

何れにしても、上述したインナーシャフト25の前端部と一方のヨーク9aとの結合部の場合には、上記他方のヨーク20aを上記入力シャフト8の上端部に結合する作業時に限らず、自動車の運転時に万一、上記ボルト16aが緩んだ場合でも、上記インナーシャフト25の前端部が上記一方のヨーク9aのシャフト取付部10の内側から基端側に抜け出る事を防止できる。即ち、上記ボルト16aが緩んだ状態で、依然として図3に示す様に、上記ボルト16aの円柱部41及びテーパ面部42が上記インナーシャフト25の係合凹部27内に進入している場合には、この係合凹部27の前端縁が上記円柱部41及びテーパ面部42に係合する事によって、上記抜け出しを防止できる。これに対し、上記ボルト16aが更に緩んだ状態で、図4〜5に示す仮止めの状態となっている場合には、図4に仮想線(二点差線)で示す様に、上記インナーシャフト25の係合凸部15aが上記ボルト16aの雄ねじ部18aと係合する事によって、上記抜け出しを防止できる。 In any case, in the case of the connecting portion between the front end portion of the inner shaft 25 and the one yoke 9a, the operation is not limited to the operation of connecting the other yoke 20a to the upper end portion of the input shaft 8, and Even if the bolt 16a is loosened during operation, the front end portion of the inner shaft 25 can be prevented from slipping out from the inside of the shaft mounting portion 10 of the one yoke 9a to the base end side. That is, when the bolt 16a is loosened and the cylindrical portion 41 and the tapered surface portion 42 of the bolt 16a still enter the engagement recess 27 of the inner shaft 25 as shown in FIG. When the front end edge of the engaging recess 27 engages with the cylindrical portion 41 and the tapered surface portion 42, it is possible to prevent the withdrawal. On the other hand, when the bolt 16a is further loosened and is in the temporarily fixed state shown in FIGS. 4 to 5, the inner shaft as shown by the phantom line (two-point difference line) in FIG. The 25 engagement protrusions 15a engage with the male threaded portion 18a of the bolt 16a, thereby preventing the above-described withdrawal.

上述した様な本例のシャフトと自在継手のヨークとの結合部及びシャフトの製造方法の場合には、前述の図27に示した従来構造の場合と異なり、設計段階で定める係合凸部15aの円周方向の幅寸法Wを大きくする事に伴って、この係合凸部15aを形成する為の肉が減少する事はない。又、この係合凸部15aの幅寸法Wを余程大きくしない限り、前述の図27に示した従来構造の場合と比べて、上記係合凸部15aの加工力を小さくできる。この為、この加工力によって加工部位の周囲部分(例えば上記係合凸部15aの周囲に存在する雄セレーション部26)を変形させにくくできる。従って、一方のヨーク9aを構成するシャフト取付部10の円周方向両端縁同士の間隔が広く、これに合わせて、設計段階で定める上記係合凸部15aの幅寸法を大きくする場合でも、この係合凸部15aを形成する事が容易となる。更に、本例の場合には、上記インナーシャフト25の前端部に設けた円筒部30の円周方向一部分を径方向外方に向け塑性的に曲げ起こして上記係合凸部15aを形成する為、前述の図27に示した従来構造の場合と比べて、この係合凸部15aの高さ寸法を大きくする事が容易となる。具体的には、本例の場合、上記係合凸部15aの大きさは、上記インナーシャフト25の前端部に設ける円筒部30の外径及び内径と、前記押し付け治具33を構成する押し付け部38の円周方向の幅寸法と、この押し付け部38の加工時のストローク量とにより、任意に設定できる。   In the case of the connecting portion between the shaft and the yoke of the universal joint and the manufacturing method of the shaft as described above, unlike the conventional structure shown in FIG. 27 described above, the engaging convex portion 15a determined at the design stage. As the width dimension W in the circumferential direction is increased, the meat for forming the engaging projections 15a does not decrease. Further, as long as the width dimension W of the engaging convex portion 15a is not increased so much, the working force of the engaging convex portion 15a can be reduced as compared with the case of the conventional structure shown in FIG. For this reason, it is possible to make it difficult to deform the peripheral portion of the processing portion (for example, the male serration portion 26 existing around the engaging convex portion 15a) by this processing force. Therefore, even if the interval between the circumferential edges of the shaft mounting portion 10 constituting one yoke 9a is wide, and the width dimension of the engaging convex portion 15a determined at the design stage is increased accordingly, It becomes easy to form the engaging convex part 15a. Further, in the case of this example, in order to form the engagement convex portion 15a by plastically bending a circumferential portion of the cylindrical portion 30 provided at the front end portion of the inner shaft 25 outward in the radial direction. Compared with the case of the conventional structure shown in FIG. 27, it is easy to increase the height of the engaging projection 15a. Specifically, in the case of this example, the size of the engaging convex portion 15 a is such that the outer diameter and inner diameter of the cylindrical portion 30 provided at the front end portion of the inner shaft 25 and the pressing portion constituting the pressing jig 33. It can be arbitrarily set by the width dimension of the circumferential direction of 38 and the stroke amount at the time of processing of the pressing portion 38.

[実施の形態の第2例]
図12は、請求項1、3に対応する、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、インナーシャフト25aの前端部(図12の左端部)外周面に係合凸部15aを形成する際に使用する受け治具32aの構造が、上述した第1例の場合と異なる。本例の場合、この受け治具32aは、1対の分割素子44a、44bを備える。そして、このうちの一方の分割素子44aを上記インナーシャフト25aの係合凹部27に係合させた状態で、これら両分割素子44a、44bにより、このインナーシャフト25aの前端寄り部分を把持している。この様な本例の場合には、上記係合凹部27の形状精度を利用して、上記受け治具32aによる、上記インナーシャフト25aの径方向及び軸方向の位置決め精度を十分に確保できる。又、本例の場合には、上記係合凸部15aの形成時に、上記インナーシャフト25aの後端部(図12の右端部)に受け治具を嵌め込む必要がない為、このインナーシャフト25aの後端部を円筒部としていない。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。
[Second Example of Embodiment]
FIG. 12 shows a second example of the embodiment of the invention corresponding to claims 1 and 3. In the case of this example, the structure of the receiving jig 32a used when forming the engagement convex part 15a on the outer peripheral surface of the front end part (left end part of FIG. 12) of the inner shaft 25a is the case of the first example described above. And different. In the case of this example, the receiving jig 32a includes a pair of split elements 44a and 44b. Then, in a state where one of the split elements 44a is engaged with the engagement recess 27 of the inner shaft 25a, a part near the front end of the inner shaft 25a is held by the split elements 44a and 44b. . In the case of this example, it is possible to sufficiently secure the radial and axial positioning accuracy of the inner shaft 25a by the receiving jig 32a using the shape accuracy of the engaging recess 27. Further, in the case of this example, since it is not necessary to fit a receiving jig into the rear end portion (the right end portion in FIG. 12) of the inner shaft 25a when the engaging convex portion 15a is formed, the inner shaft 25a The rear end portion is not a cylindrical portion. Other configurations and operations are the same as those in the first example of the embodiment described above.

[実施の形態の第3例]
図13〜15は、請求項1、3に対応する、本発明の実施の形態の第3例を示している。本例の場合、図示しない自在継手のヨークに結合するシャフト45は、外周面の径方向反対側となる2個所位置に、互いに平行な1対の平面部46、46を有する。これにより、この外周面の断面形状を、図15に示す様な小判型としている。又、上記シャフト45の一端部(図13の左端部)の内径側に、このシャフト45の中心軸に対して偏心した円孔28を形成する事により、このシャフト45の一端部を、径方向の肉厚が全周に亙り不均一な筒部47としている。本例の場合、上記シャフト45の一端部外周面(図13、15の上面)に係合凸部15aを形成する作業を行う際には、図13に示す様に、有底筒状の受け治具32bによって、上記シャフト45の他半部(図13の右半部)を、径方向及び軸方向の位置決めを図った状態で支持する。そして、この状態で、前述した実施の形態の第1例の場合と同様、上記円孔28の内側に押し付け治具33の円柱部37の先端部を押し込む事に基づき、この押し付け治具33の押し付け部38によって上記係合凸部15aを形成する。尚、本例の場合、上記自在継手のヨークとしては、ボルトを締め付けた状態で、上記両平面部46、46の一端部と摩擦係合する、1対の抑え面を備えたシャフト取付部を有するもの(例えば、所謂横入れ式のヨーク)を使用する。
[Third example of embodiment]
13 to 15 show a third example of an embodiment of the present invention corresponding to claims 1 and 3. In the case of this example, the shaft 45 coupled to a yoke of a universal joint (not shown) has a pair of plane portions 46 and 46 parallel to each other at two positions on the radially opposite side of the outer peripheral surface. Thereby, the cross-sectional shape of this outer peripheral surface is an oval shape as shown in FIG. Further, by forming a circular hole 28 eccentric to the central axis of the shaft 45 on the inner diameter side of one end portion (the left end portion in FIG. 13) of the shaft 45, the one end portion of the shaft 45 is arranged in the radial direction. The tube portion 47 is non-uniform over the entire circumference. In the case of this example, when the engagement convex portion 15a is formed on the outer peripheral surface of the one end portion of the shaft 45 (the upper surface in FIGS. 13 and 15), as shown in FIG. The other half of the shaft 45 (the right half of FIG. 13) is supported by the jig 32b in a state where the radial and axial positioning is intended. Then, in this state, as in the case of the first example of the above-described embodiment, the pressing jig 33 has the pressing jig 33 based on pushing the tip of the cylindrical part 37 of the pressing jig 33 into the circular hole 28. The engaging convex portion 15 a is formed by the pressing portion 38. In this example, the yoke of the universal joint is a shaft mounting portion having a pair of restraining surfaces that frictionally engage with one end portions of the flat portions 46 and 46 in a state where the bolt is tightened. What it has (for example, what is called a horizontal insertion type yoke) is used.

[実施の形態の第4例]
図16〜18は、請求項1、3に対応する、本発明の実施の形態の第4例を示している。本例の場合、図示しない自在継手のヨークに結合するシャフト48は、全体を筒状に形成している。具体的には、このシャフト48の一端部(図16の左端部)乃至一端寄り部を角筒状に形成すると共に、他端部(図16の右端部)乃至中間部を円筒状に形成している。本例の場合、このシャフト48の一端部外周面(図16、18の上面)に係合凸部15aを形成する作業を行う際には、図16に示す様に、受け治具32によって、上記シャフト48の他端部を、径方向及び軸方向の位置決めを図った状態で支持する。そして、この状態で、上記シャフト48の一端部の内側に押し付け治具33aの角柱部49の先端部をがたつきなく押し込む事に基づき、前述した実施の形態の第1例の場合と同様、上記押し付け治具33aの押し付け部38によって上記係合凸部15aを形成する。尚、本例の場合も、上記自在継手のヨークとしては、ボルトを締め付けた状態で、上記シャフト48の一端部両側面に存在する互いに平行な1対の平面部46a、46aと摩擦係合する、1対の抑え面を備えたシャフト取付部を有するもの(例えば、所謂横入れ式のヨーク)を使用する。
[Fourth Example of Embodiment]
16 to 18 show a fourth example of an embodiment of the present invention corresponding to claims 1 and 3. In the case of this example, the shaft 48 coupled to a universal joint yoke (not shown) is formed in a cylindrical shape as a whole. Specifically, one end portion (left end portion in FIG. 16) or one end portion of the shaft 48 is formed in a square tube shape, and the other end portion (right end portion in FIG. 16) or an intermediate portion is formed in a cylindrical shape. ing. In the case of this example, when performing the operation of forming the engagement convex portion 15a on the outer peripheral surface of one end portion of the shaft 48 (the upper surface of FIGS. 16 and 18), as shown in FIG. The other end portion of the shaft 48 is supported in a state in which positioning in the radial direction and the axial direction is achieved. And in this state, based on pushing the tip of the prism portion 49 of the pressing jig 33a into the inner side of one end of the shaft 48 without rattling, as in the case of the first example of the embodiment described above, The engaging convex portion 15a is formed by the pressing portion 38 of the pressing jig 33a. In this example as well, the yoke of the universal joint is frictionally engaged with a pair of parallel flat portions 46a and 46a existing on both side surfaces of one end of the shaft 48 in a state where the bolt is tightened. One having a shaft mounting portion having a pair of restraining surfaces (for example, a so-called horizontal insertion type yoke) is used.

尚、請求項1、3に対応する発明を実施する場合、係合凸部は、シャフトの一端部に設けた筒部のうちで、この係合凸部を形成すべき部分の円周方向両側部分にそれぞれ切れ目を形成した後、これら両切れ目同士の間部分を径方向外方に向け塑性的に曲げ起こす事によって形成する事もできる。   When the invention corresponding to claims 1 and 3 is carried out, the engaging protrusions are on both sides in the circumferential direction of the portion where the engaging protrusions are to be formed among the cylindrical portions provided at one end of the shaft. It can also be formed by forming a cut in each part and then bending the part between the two cuts plastically toward the outside in the radial direction.

[実施の形態の第5例]
図19〜24は、請求項2、4に対応する、本発明の実施の形態の第5例を示している。尚、本例の特徴は、インナーシャフト25bの前端部(図19、20、23、24の左端部)外周面に設ける係合凸部15bの構造及びその形成方法にある。その他の部分の構造及び作用は、前述の図1〜5に示した第1例の場合と同様であるから、重複する図示並びに説明は省略若しくは簡略にし、以下、本例の特徴部分、並びに、上記第1例と異なる部分を中心に説明する。
[Fifth Example of Embodiment]
19 to 24 show a fifth example of the embodiment of the invention corresponding to claims 2 and 4. The feature of this example is the structure of the engaging projection 15b provided on the outer peripheral surface of the front end of the inner shaft 25b (the left end of FIGS. 19, 20, 23, and 24) and the method of forming the same. Since the structure and operation of the other parts are the same as in the case of the first example shown in FIGS. 1 to 5 described above, overlapping illustrations and explanations are omitted or simplified. A description will be given centering on differences from the first example.

図19〜22に完成後のインナーシャフト25bを示す様に、本例の場合には、このインナーシャフト25bの前端部外周面に係合凸部15bを形成する為、このインナーシャフト25bの外周面のうちで、上記係合凸部15bの後端側(図19、20、23、24の右端側)に隣接する部分に、矩形の凹溝50を形成している。本例の場合、この凹溝50の円周方向に関する位相及び幅寸法は、この凹溝50よりも後側に存在する、係合凹部27の円周方向に関する位相及び幅寸法と等しくしている。又、本例の場合、これら係合凹部27と凹溝50とは、上記インナーシャフト25bの外周面に雄セレーション部26を形成した後に、フライス加工により形成する。尚、上述の様に、本例の場合には、上記係合凹部27と上記凹溝50とを、上記インナーシャフト25bの外周面のうちで、円周方向の位相が等しく、しかも互いに近接した位置に形成する。この為、上記係合凹部27と上記凹溝50とをフライス加工により形成する作業は、それぞれ同一のチャッキング状態で行える(フライス盤のチャックへの被加工物の着脱を1回で済ませられる)。   As shown in FIGS. 19 to 22, the completed inner shaft 25 b, in the case of this example, in order to form the engagement convex portion 15 b on the outer peripheral surface of the front end portion of the inner shaft 25 b, the outer peripheral surface of the inner shaft 25 b Among them, a rectangular concave groove 50 is formed in a portion adjacent to the rear end side of the engagement convex portion 15b (the right end side of FIGS. 19, 20, 23, and 24). In the case of this example, the phase and width dimension in the circumferential direction of the concave groove 50 are equal to the phase and width dimension in the circumferential direction of the engagement concave portion 27 that exists on the rear side of the concave groove 50. . In the case of this example, the engaging recess 27 and the groove 50 are formed by milling after the male serration portion 26 is formed on the outer peripheral surface of the inner shaft 25b. As described above, in the case of this example, the engagement recess 27 and the recess 50 have the same circumferential phase on the outer peripheral surface of the inner shaft 25b and are close to each other. Form in position. For this reason, the operation of forming the engaging recess 27 and the recess groove 50 by milling can be performed in the same chucking state (the workpiece can be attached to and detached from the chuck of the milling machine only once).

又、上記係合凸部15bは、上記雄セレーション部26と、上記係合凹部27及び凹溝50とを形成したシャフト中間体を造った後、図23〜24に示す様に、受け治具32cと押し付け治具33bとを使用して形成する。このうちの受け治具32cは、基端部(図23の右端部)の下面(上下方向は図23による。)に支持板部51を、先端部の下面に抑え板部52を、それぞれ備える。又、上記押し付け治具33bは、先端部(図23〜24の右端部)の下半部に、上記係合凸部15bと同じ横幅を有する、板状の押し付け部38aを備える。   In addition, the engaging convex portion 15b is formed as a shaft intermediate body in which the male serration portion 26, the engaging concave portion 27 and the concave groove 50 are formed, and then a receiving jig as shown in FIGS. It is formed using 32c and the pressing jig 33b. Of these, the receiving jig 32c includes a support plate portion 51 on the lower surface (upper and lower direction in FIG. 23) of the base end portion (the right end portion in FIG. 23), and a holding plate portion 52 on the lower surface of the distal end portion. . The pressing jig 33b includes a plate-shaped pressing portion 38a having the same lateral width as that of the engaging convex portion 15b in the lower half portion of the tip portion (the right end portion in FIGS. 23 to 24).

上記受け治具32cと上記押し付け治具33bとを使用して、上記係合凸部15bを形成する場合には、図23に示す様に、上記受け治具32cを構成する支持板部51により、上記インナーシャフト25bの後端面を支持する。これと共に、上記受け治具32cを構成する抑え板部52により、上記インナーシャフト25bの前端面と上記凹溝50との間部分に存在する肉の後端面を抑えた状態とする。そして、この状態で、上記押し付け治具33bを構成する押し付け部38aの先端面を、上記肉の前端面の円周方向中央部分に押し付ける。更に、この押し付けた部分の肉を塑性変形させつつ、この肉の内側に上記押し付け部38aの先端部を押し込む。これにより、上記肉のうち、この押し付け部38aと上記抑え板部52との間に挟まれた部分を、軸方向に押し潰して径方向に***させる。そして、この様に径方向に***させた部分を、上記係合凸部15bとする。   When the engaging projection 15b is formed by using the receiving jig 32c and the pressing jig 33b, as shown in FIG. 23, the support plate 51 constituting the receiving jig 32c is used. The rear end surface of the inner shaft 25b is supported. At the same time, the rear end surface of the meat existing between the front end surface of the inner shaft 25b and the concave groove 50 is suppressed by the holding plate portion 52 constituting the receiving jig 32c. And in this state, the front end surface of the pressing part 38a which comprises the said pressing jig 33b is pressed on the circumferential direction center part of the front-end surface of the said meat | flesh. Further, the tip of the pressing portion 38a is pushed into the inside of the meat while plastically deforming the pressed portion of the meat. As a result, a portion of the meat sandwiched between the pressing portion 38a and the pressing plate portion 52 is crushed in the axial direction and raised in the radial direction. The portion raised in the radial direction in this way is referred to as the engagement convex portion 15b.

尚、本例の場合、上記係合凸部15bの高さ寸法は、上記凹溝50の深さ寸法、及び、上記肉に対する上記押し付け部38aの押し込み量によって調節できる。この場合に、この肉に対するこの押し付け部38aの押し込み量は、例えば、上記押し付け治具33bの先端部の上半部で、上記押し付け部38aよりも先端側に突出した部分の先端面が、上記受け治具32cの先端面の上半部に当接する迄の量にする等、各種の方法で規制できる。   In the case of this example, the height dimension of the engaging convex portion 15b can be adjusted by the depth dimension of the concave groove 50 and the pressing amount of the pressing portion 38a against the meat. In this case, the pressing amount of the pressing portion 38a with respect to the meat is, for example, in the upper half of the tip portion of the pressing jig 33b, the tip surface of the portion protruding to the tip side from the pressing portion 38a is The amount can be regulated by various methods, for example, the amount until it comes into contact with the upper half of the front end surface of the receiving jig 32c.

上述した様な本例の場合には、前述の図27に示した従来構造の場合と異なり、設計段階で定める係合凸部15bの円周方向の幅寸法W(図21)を大きくする事に伴って、この係合凸部15bを形成する為の肉が減少する事はない。この為、ヨーク9aを構成するシャフト取付部10(図3参照)の円周方向両端縁同士の間隔が広く、これに合わせて、設計段階で定める上記係合凸部15bの幅寸法を大きくする場合でも、この係合凸部15bを形成する事が容易となる。又、本例の場合、この係合凸部15bを形成する為に、インナーシャフト25bの前端面に孔を形成する(この前端部を筒部とする)必要がない。又、その代わりに、上記凹溝50を形成する必要があるが、前述した通り、この凹溝50は、前記係合凹部27と共に、同一のチャッキング状態で加工できる。この為、上記インナーシャフト25bの製造コストを抑えられる。   In the case of this example as described above, unlike in the case of the conventional structure shown in FIG. 27, the circumferential width W (FIG. 21) of the engaging convex portion 15b determined in the design stage is increased. Along with this, the meat for forming the engaging projections 15b is not reduced. For this reason, the space | interval of the circumferential direction both ends edge of the shaft attaching part 10 (refer FIG. 3) which comprises the yoke 9a is wide, and the width dimension of the said engaging convex part 15b defined in a design stage is enlarged according to this. Even in this case, it is easy to form the engaging projection 15b. In the case of this example, it is not necessary to form a hole in the front end surface of the inner shaft 25b (this front end portion is used as a cylinder portion) in order to form the engagement convex portion 15b. Instead, the groove 50 needs to be formed. As described above, the groove 50 can be processed together with the engagement recess 27 in the same chucking state. For this reason, the manufacturing cost of the inner shaft 25b can be suppressed.

[実施の形態の第6例]
図25は、請求項2、4に対応する、本発明の実施の形態の第6例を示している。本例の場合には、インナーシャフト25bの前端部外周面に係合凸部15bを形成する際に使用する受け治具32dの構造が、上述した第5例の場合と異なる。本例の場合、この受け治具32dは、1対の分割素子44c、44dを備える。そして、このうちの一方の分割素子44cを上記インナーシャフト25bの係合凹部27に係合させた状態で、これら両分割素子44c、44dにより、このインナーシャフト25bの前端寄り部分を把持している。この様な本例の場合には、上記係合凹部27の形状精度を利用して、上記受け治具32dによる、上記インナーシャフト25bの径方向及び軸方向の位置決め精度を十分に確保できる。その他の構成及び作用は、上述した第5例の場合と同様である為、同等部分には同一符号を付して、重複する説明は省略する。
[Sixth Example of Embodiment]
FIG. 25 shows a sixth example of an embodiment of the present invention corresponding to claims 2 and 4. In the case of this example, the structure of the receiving jig 32d used when forming the engagement convex part 15b on the outer peripheral surface of the front end part of the inner shaft 25b is different from the case of the fifth example described above. In the case of this example, the receiving jig 32d includes a pair of split elements 44c and 44d. Then, with one of the split elements 44c engaged with the engagement recess 27 of the inner shaft 25b, the split elements 44c and 44d hold the portion near the front end of the inner shaft 25b. . In the case of this example, it is possible to sufficiently secure the radial and axial positioning accuracy of the inner shaft 25b by the receiving jig 32d using the shape accuracy of the engaging recess 27. Since other configurations and operations are the same as those in the case of the fifth example described above, the same parts are denoted by the same reference numerals, and redundant description is omitted.

尚、図示は省略するが、上述した実施の形態の第5〜6例を実施する場合、受け治具や押し付け治具の先端部に、形成途中の係合凸部の幅寸法が円周方向に広がるのを防止する為の、ガイド凹部を設ける事もできる。   In addition, although illustration is abbreviate | omitted, when implementing the 5th-6th example of embodiment mentioned above, the width dimension of the engagement convex part in the middle of formation is the circumferential direction at the front-end | tip part of a receiving jig or a pressing jig. It is also possible to provide a guide recess to prevent it from spreading.

又、図示は省略するが、請求項2、4に対応する発明は、前述の図13〜15に示した様なシャフト、即ち、外周面の径方向反対側となる2個所位置に、互いに平行な1対の平面部を有するシャフトを対象として実施する事ができる。更には、前述の図16〜18に示した様な中空のシャフトを対象として実施する事もできる。   Although not shown in the drawings, the inventions corresponding to claims 2 and 4 are parallel to each other at two positions on the shafts as shown in FIGS. This can be implemented for a shaft having a pair of flat portions. Furthermore, the present invention can also be carried out on a hollow shaft as shown in FIGS.

本発明の実施の形態の第1例の結合部を組み込んだステアリング装置用回転伝達装置の側面図。The side view of the rotation transmission apparatus for steering devices incorporating the coupling part of the 1st example of embodiment of this invention. 図1のA部を拡大して示す部分断面図。The fragmentary sectional view which expands and shows the A section of FIG. 図2の拡大B−B断面図。The expanded BB sectional drawing of FIG. 仮止めの状態で示す、図2と同様の図。The figure similar to FIG. 2 shown in the state of temporary fixing. 図4のC−C断面図。CC sectional drawing of FIG. 中間シャフトを構成するインナーシャフトの側面図。The side view of the inner shaft which comprises an intermediate shaft. 図6のD矢視図。D arrow line view of FIG. 図6の左方から見た図。The figure seen from the left of FIG. 上記インナーシャフトの前半部の斜視図。The perspective view of the front half part of the said inner shaft. 上記インナーシャフトの前端部外周面に係合凸部を形成する作業状態を示す部分断面図。The fragmentary sectional view which shows the operation state which forms an engaging convex part in the front-end part outer peripheral surface of the said inner shaft. 図10のE矢視図。The E arrow line view of FIG. 本発明の実施の形態の第2例を示す、図10と同様の図。The figure similar to FIG. 10 which shows the 2nd example of embodiment of this invention. 同第3例を示す、図10と同様の図。The figure similar to FIG. 10 which shows the 3rd example. 図13のF矢視図。F arrow line view of FIG. シャフトのみを取り出して示す、図13の左方から見た図。The figure seen from the left of FIG. 13 which shows only a shaft and shows. 本発明の実施の形態の第4例を示す、図10と同様の図。The figure similar to FIG. 10 which shows the 4th example of embodiment of this invention. 図16のG矢視図。G arrow line view of FIG. シャフトのみを取り出して示す、図16の左方から見た図。The figure seen from the left of FIG. 16, showing only the shaft. 本発明の実施の形態の第5例を示す、中間シャフトを構成するインナーシャフトの側面図。The side view of the inner shaft which comprises the intermediate shaft which shows the 5th example of embodiment of this invention. 図19のH矢視図。H arrow line view of FIG. 図19の左方から見た図。The figure seen from the left of FIG. 上記インナーシャフトの前半部の斜視図。The perspective view of the front half part of the said inner shaft. 上記インナーシャフトの前端部外周面に係合凸部を形成する作業状態を示す部分断面図。The fragmentary sectional view which shows the operation state which forms an engaging convex part in the front-end part outer peripheral surface of the said inner shaft. 一部を切断した状態で示す、図23のI矢視図。The arrow I view of FIG. 23 shown in the state which cut | disconnected a part. 本発明の実施の形態の第6例を示す、図23と同様の図。The figure similar to FIG. 23 which shows the 6th example of embodiment of this invention. ステアリング装置の1例を示す略側面図。The schematic side view which shows an example of a steering device. シャフトと自在継手のヨークとの結合部の従来構造の1例を示す分解斜視図。The disassembled perspective view which shows an example of the conventional structure of the coupling | bond part of a shaft and the yoke of a universal joint.

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 自在継手
5、5a 中間シャフト
6、6a 自在継手
7 ステアリングギヤユニット
8 入力シャフト
9、9a ヨーク
10 シャフト取付部
11 雌セレーション部
12a、12b、12c、12d フランジ部
13、13a 通孔
14 雄セレーション部
15、15a、15b 係合凸部
16、16a ボルト
17、17a 杆部
18、18a 雄ねじ部
19、19a 頭部
20、20a ヨーク
21 十字軸
22 ヨーク
23 ヨーク
24 アウターシャフト
25、25a、25b インナーシャフト
26 雄セレーション部
27 係合凹部
28 円孔
29 円孔
30 円筒部
31 円筒部
32、32a〜32d 受け治具
33、33a、33b 押し付け治具
34 円筒部
35 底板部
36 円柱部
37 円柱部
38、38a 押し付け部
39 傾斜面
40 ねじ孔
41 円柱部
42 テーパ面部
43 鍔部
44a〜44d 分割素子
45 シャフト
46、46a 平面部
47 筒部
48 シャフト
49 角柱部
50 凹溝
51 支持板部
52 抑え板部
DESCRIPTION OF SYMBOLS 1 Steering wheel 2 Steering shaft 3 Steering column 4 Universal joint 5, 5a Intermediate shaft 6, 6a Universal joint 7 Steering gear unit 8 Input shaft 9, 9a Yoke 10 Shaft attachment part 11 Female serration part 12a, 12b, 12c, 12d Flange part 13, 13a Through-hole 14 Male serration portion 15, 15a, 15b Engagement convex portion 16, 16a Bolt 17, 17a Hook portion 18, 18a Male screw portion 19, 19a Head portion 20, 20a Yoke 21 Cross shaft 22 Yoke 23 Yoke 24 Outer Shaft 25, 25a, 25b Inner shaft 26 Male serration portion 27 Engaging recess 28 Circular hole 29 Circular hole 30 Cylindrical portion 31 Cylindrical portion 32, 32a to 32d Receiving jig 33, 33a, 33b Pressing jig 34 Cylindrical portion 3 Bottom plate portion 36 Column portion 37 Column portion 38, 38a Pressing portion 39 Inclined surface 40 Screw hole 41 Column portion 42 Tapered surface portion 43 Gutter portion 44a-44d Splitting element 45 Shaft 46, 46a Plane portion 47 Tube portion 48 Shaft 49 Square column portion 50 Concave Groove 51 Support plate 52 Holding plate

Claims (4)

自在継手のヨークと、シャフトと、ボルトとを備え、
このうちのヨークは、円周方向1個所に不連続部を有する筒状のシャフト取付部と、このシャフト取付部の円周方向両端縁に連続する状態で互いにほぼ平行に設けられた1対のフランジ部と、これら両フランジ部のうちの一方のフランジ部に設けられた通孔と、他方のフランジ部にこの通孔と同心に設けられたねじ孔とを有するものであり、
上記シャフトは、一端部外周面の円周方向1個所に係合凸部を有するもので、一端部を上記シャフト取付部の内側に挿入すると共に、この係合凸部を、このシャフト取付部の円周方向両端縁同士の間部分で且つ上記通孔及びねじ孔よりもこのシャフト取付部の軸方向奥側部分に配置しており、
上記ボルトは、少なくとも先端部に雄ねじ部を設けた杆部と、この杆部の基端部に存在する頭部とを有するもので、このうちの杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合し、更に締め付ける事で、上記シャフト取付部に対し上記シャフトの一端部を結合しており、
上記ボルトの杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合し、且つ、上記ボルトを締め付けていない、仮止めの状態でも、上記シャフト取付部の内側から上記シャフトの一端部が他端側に抜け出る事を、上記ボルトの杆部と上記係合凸部との係合に基づいて阻止できる様にしている、
シャフトと自在継手のヨークとの結合部に於いて、
上記シャフトは、外周面の一端寄り部の円周方向一部分に、この外周面から径方向内方に凹入した係合凹部を、この外周面の一端縁部のうちでこの係合凹部と円周方向同位相の部分に、この外周面から径方向外方に突出した上記係合凸部を、それぞれ形成すると共に、少なくとも一端部を筒部としており、上記係合凸部は、この筒部の先端部の円周方向一部分を、当該部分の円周方向両側部分から切り離した状態で、径方向外方に向け塑性的に曲げ起こして形成したものであり、
上記ボルトは、上記杆部の基端側部分を円柱部とし、同じく先端側部分をこの円柱部に比較して小径の上記雄ねじ部としたものであり、上記杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合した状態で、この雄ねじ部は、この雄ねじ部のこのねじ孔に対する螺入量の大きさに拘らず、上記係合凹部内に進入しないものであり、同じく上記円柱部は、上記螺入量を所定の大きさ以上とした場合にのみ、上記係合凹部内に進入するものであり、
上記ボルトの杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合し、且つ、上記ボルトを締め付けていない状態でも、上記円柱部が上記係合凹部内に進入している場合には、これら円柱部と係合凹部の一端縁との係合に基づいて、同じく進入していない場合には、上記雄ねじ部と上記係合凸部との係合に基づいて、それぞれ上記シャフト取付部の内側から上記シャフトの一端部が他端側に抜け出る事を防止できる様にしている事を特徴とするシャフトと自在継手のヨークとの結合部。
It includes a universal joint yoke, shaft, and bolt.
Among these, the yoke is a pair of cylindrical shaft mounting portions having a discontinuous portion at one circumferential direction, and a pair of substantially parallel to each other in a state of being continuous with both circumferential edges of the shaft mounting portion. It has a flange portion, a through hole provided in one of the two flange portions, and a screw hole provided concentrically with the through hole in the other flange portion,
The shaft has an engaging convex portion at one location in the circumferential direction of the outer peripheral surface of the one end portion. The one end portion is inserted inside the shaft attaching portion, and the engaging convex portion is inserted into the shaft attaching portion. It is arranged in the axial direction back side part of this shaft attachment part rather than the above-mentioned through hole and screw hole in the part between both edges in the circumferential direction,
The bolt has at least a flange portion provided with a male screw portion at a distal end portion and a head portion present at a proximal end portion of the flange portion, and the flange portion is inserted through the inside of the through hole. In addition, by screwing the male screw portion into the screw hole and further tightening, the one end portion of the shaft is coupled to the shaft mounting portion,
Even when the bolt is inserted into the through hole, the male screw part is screwed into the screw hole, and the bolt is not tightened, even in a temporarily fixed state, from the inside of the shaft mounting part. The one end portion of the shaft is prevented from coming out to the other end side based on the engagement between the flange portion of the bolt and the engagement convex portion,
In the joint between the shaft and the universal joint yoke,
The shaft has an engagement recess recessed inward in the radial direction from the outer peripheral surface in a portion in the circumferential direction near the one end of the outer peripheral surface, and the engagement concave portion and the circle of the one end edge of the outer peripheral surface. The engaging projections projecting radially outward from the outer circumferential surface are formed on the same phase in the circumferential direction, respectively, and at least one end is a cylindrical portion, and the engaging convex portion is the cylindrical portion. of the circumferential portion of the distal end portion, in a state of disconnection from the circumferential both side portions of the partial state, and are not formed by plastically bent-up outwardly in the radial direction,
In the bolt, the base end side portion of the flange portion is a cylindrical portion, and the distal end side portion is the male screw portion having a diameter smaller than that of the cylindrical portion, and the flange portion is formed inside the through hole. The male threaded portion is inserted into the threaded hole and the male threaded portion does not enter the engaging recess regardless of the amount of threading of the male threaded portion into the threaded hole. In the same manner, the cylindrical portion enters the engagement recess only when the screwing amount is not less than a predetermined size.
The cylindrical portion enters the engagement recess even when the flange portion of the bolt is inserted into the through hole, the male screw portion is screwed into the screw hole, and the bolt is not tightened. In the case where the cylindrical portion and the one end edge of the engaging concave portion are engaged, in the case where the cylindrical portion and the engaging convex portion are not in the same manner, the male screw portion and the engaging convex portion are engaged. A coupling portion between the shaft and the universal joint yoke, wherein the shaft can be prevented from slipping out from the inner side of the shaft mounting portion to the other end side .
自在継手のヨークと、シャフトと、ボルトとを備え、
このうちのヨークは、円周方向1個所に不連続部を有する筒状のシャフト取付部と、このシャフト取付部の円周方向両端縁に連続する状態で互いにほぼ平行に設けられた1対のフランジ部と、これら両フランジ部のうちの一方のフランジ部に設けられた通孔と、他方のフランジ部にこの通孔と同心に設けられたねじ孔とを有するものであり、
上記シャフトは、一端部外周面の円周方向1個所に係合凸部を有するもので、一端部を上記シャフト取付部の内側に挿入すると共に、この係合凸部を、このシャフト取付部の円周方向両端縁同士の間部分で且つ上記通孔及びねじ孔よりもこのシャフト取付部の軸方向奥側部分に配置しており、
上記ボルトは、少なくとも先端部に雄ねじ部を設けた杆部と、この杆部の基端部に存在する頭部とを有するもので、このうちの杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合し、更に締め付ける事で、上記シャフト取付部に対し上記シャフトの一端部を結合しており、
上記ボルトの杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合し、且つ、上記ボルトを締め付けていない、仮止めの状態でも、上記シャフト取付部の内側から上記シャフトの一端部が他端側に抜け出る事を、上記ボルトの杆部と上記係合凸部との係合に基づいて阻止できる様にしている、
シャフトと自在継手のヨークとの結合部に於いて、
上記シャフトは、外周面の一端寄り部の円周方向一部分に、この外周面から径方向内方に凹入した係合凹部を、この外周面の一端縁部のうちでこの係合凹部と円周方向同位相の部分に、この外周面から径方向外方に突出した上記係合凸部を、それぞれ形成すると共に、一端寄り部外周面の円周方向1個所に凹溝を形成しており、上記係合凸部は、この凹溝と上記シャフトの一端面との間部分に存在する肉を、このシャフトの軸方向に押し潰して径方向外方に***させる事により形成したものであり、
上記ボルトは、上記杆部の基端側部分を円柱部とし、同じく先端側部分をこの円柱部に比較して小径の上記雄ねじ部としたものであり、上記杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合した状態で、この雄ねじ部は、この雄ねじ部のこのねじ孔に対する螺入量の大きさに拘らず、上記係合凹部内に進入しないものであり、同じく上記円柱部は、上記螺入量を所定の大きさ以上とした場合にのみ、上記係合凹部内に進入するものであり、
上記ボルトの杆部を上記通孔の内側に挿通すると共に、上記雄ねじ部を上記ねじ孔に螺合し、且つ、上記ボルトを締め付けていない状態でも、上記円柱部が上記係合凹部内に進入している場合には、これら円柱部と係合凹部の一端縁との係合に基づいて、同じく進入していない場合には、上記雄ねじ部と上記係合凸部との係合に基づいて、それぞれ上記シャフト取付部の内側から上記シャフトの一端部が他端側に抜け出る事を防止できる様にしている事を特徴とするシャフトと自在継手のヨークとの結合部。
It includes a universal joint yoke, shaft, and bolt.
Among these, the yoke is a pair of cylindrical shaft mounting portions having a discontinuous portion at one circumferential direction, and a pair of substantially parallel to each other in a state of being continuous with both circumferential edges of the shaft mounting portion. It has a flange portion, a through hole provided in one of the two flange portions, and a screw hole provided concentrically with the through hole in the other flange portion,
The shaft has an engaging convex portion at one location in the circumferential direction of the outer peripheral surface of the one end portion. The one end portion is inserted inside the shaft attaching portion, and the engaging convex portion is inserted into the shaft attaching portion. It is arranged in the axial direction back side part of this shaft attachment part rather than the above-mentioned through hole and screw hole in the part between both edges in the circumferential direction,
The bolt has at least a flange portion provided with a male screw portion at a distal end portion and a head portion present at a proximal end portion of the flange portion, and the flange portion is inserted through the inside of the through hole. In addition, by screwing the male screw portion into the screw hole and further tightening, the one end portion of the shaft is coupled to the shaft mounting portion,
Even when the bolt is inserted into the through hole, the male screw part is screwed into the screw hole, and the bolt is not tightened, even in a temporarily fixed state, from the inside of the shaft mounting part. The one end portion of the shaft is prevented from coming out to the other end side based on the engagement between the flange portion of the bolt and the engagement convex portion,
In the joint between the shaft and the universal joint yoke,
The shaft has an engagement recess recessed inward in the radial direction from the outer peripheral surface in a portion in the circumferential direction near the one end of the outer peripheral surface, and the engagement concave portion and the circle of the one end edge of the outer peripheral surface. The engaging projections projecting radially outward from the outer circumferential surface are formed on the same phase in the circumferential direction, respectively, and a concave groove is formed in one circumferential direction on the outer circumferential surface near the one end. The engaging convex portion is formed by crushing the meat existing in the portion between the concave groove and the one end surface of the shaft in the axial direction of the shaft so as to protrude radially outward. The
In the bolt, the base end side portion of the flange portion is a cylindrical portion, and the distal end side portion is the male screw portion having a diameter smaller than that of the cylindrical portion, and the flange portion is formed inside the through hole. The male threaded portion is inserted into the threaded hole and the male threaded portion does not enter the engaging recess regardless of the amount of threading of the male threaded portion into the threaded hole. In the same manner, the cylindrical portion enters the engagement recess only when the screwing amount is not less than a predetermined size.
The cylindrical portion enters the engagement recess even when the flange portion of the bolt is inserted into the through hole, the male screw portion is screwed into the screw hole, and the bolt is not tightened. In the case where the cylindrical portion and the one end edge of the engaging concave portion are engaged, in the case where the cylindrical portion and the engaging convex portion are not in the same manner, the male screw portion and the engaging convex portion are engaged. A coupling portion between the shaft and the universal joint yoke, wherein the shaft can be prevented from slipping out from the inner side of the shaft mounting portion to the other end side .
請求項1に記載したシャフトと自在継手のヨークとの結合部を構成するシャフトの製造方法であって、少なくとも一端部を筒部としたシャフト中間体を造った後、この筒部の先端部の円周方向一部分に治具を軸方向に押し付けつつ、当該部分に径方向外方に向く力を加える事で、当該部分の円周方向両側部分を切り裂きながら、当該部分を径方向外方に向け塑性的に曲げ起こして係合凸部を形成する、シャフトの製造方法。   A method for manufacturing a shaft constituting a joint portion between a shaft and a universal joint yoke according to claim 1, wherein after a shaft intermediate body having at least one end portion as a cylindrical portion is manufactured, the tip portion of the cylindrical portion is While pressing the jig axially to a part of the circumferential direction and applying a force that is directed radially outward to the part, the part is directed radially outward while tearing off both circumferential parts of the part. A method for manufacturing a shaft, wherein the engaging projection is formed by plastic bending. 請求項2に記載したシャフトと自在継手のヨークとの結合部を構成するシャフトの製造方法であって、一端寄り部外周面の円周方向1個所に凹溝を形成したシャフト中間体を造った後、この凹溝とこのシャフト中間体の一端面との間部分に存在する肉を、1対の治具により、このシャフト中間体の軸方向に押し潰して径方向に***させる事で係合凸部を形成する、シャフトの製造方法。   A method of manufacturing a shaft constituting a joint portion between a shaft and a universal joint yoke according to claim 2, wherein a shaft intermediate body is formed in which a concave groove is formed in one circumferential direction on the outer peripheral surface near one end. After that, the meat existing in the part between this concave groove and one end face of this shaft intermediate body is squeezed in the axial direction of this shaft intermediate body by a pair of jigs, and then engaged in a radial direction. A method for manufacturing a shaft, which forms a convex portion.
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DE112008001042.0T DE112008001042B4 (en) 2007-04-27 2008-04-25 Steering device, manufacturing method for the steering device and method of manufacturing a shaft
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