JP4687428B2 - Slide joint with slit and manufacturing method thereof - Google Patents

Slide joint with slit and manufacturing method thereof Download PDF

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JP4687428B2
JP4687428B2 JP2005351423A JP2005351423A JP4687428B2 JP 4687428 B2 JP4687428 B2 JP 4687428B2 JP 2005351423 A JP2005351423 A JP 2005351423A JP 2005351423 A JP2005351423 A JP 2005351423A JP 4687428 B2 JP4687428 B2 JP 4687428B2
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slit
axial direction
end side
outer shaft
peripheral surface
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JP2007155009A (en
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新太郎 平野
清志 菊地
和幸 石渡
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NSK Ltd
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NSK Ltd
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Description

本発明はスリット付きスライドジョイント、特に、ステアリング装置の中間シャフト等として使用されるスリット付きスライドジョイント及びその製造方法に関する。   The present invention relates to a slide joint with a slit, and more particularly to a slide joint with a slit used as an intermediate shaft or the like of a steering device and a method for manufacturing the same.

スリット付きスライドジョイントは、ステアリングホイールの回転をステアリングギヤに効率よく伝達すると共に、ステアリングホイールの位置調整時や衝突時に、アウターシャフトとインナーシャフトが、小さな摺動抵抗で相対摺動する必要がある。   The slide joint with slits efficiently transmits the rotation of the steering wheel to the steering gear, and the outer shaft and the inner shaft need to slide relative to each other with a small sliding resistance at the time of adjusting the position of the steering wheel or at the time of collision.

特許文献１のスリット付きスライドジョイントは、アウターシャフトの雌セレーション溝の内径を、スリットの軸方向中間位置が最も小径で、スリットの開放端部側が最も大径になるように成形している。これによって、アウターシャフトの雌セレーション溝とインナーシャフトの雄セレーション溝を、スリットの軸方向中間位置とスリットの開放端部側位置の二箇所で強く係合させて、ねじり剛性と摺動抵抗の両方を適正な範囲内に収めているが、操舵感を向上させるために、結合部のねじり剛性と曲げ剛性をさらに向上させることが望まれていた。   The slide joint with slit of Patent Document 1 is formed such that the inner diameter of the female serration groove of the outer shaft is the smallest in the axial middle position of the slit and the largest in the open end side of the slit. As a result, the female serration groove of the outer shaft and the male serration groove of the inner shaft are strongly engaged at two positions, the axial middle position of the slit and the open end side position of the slit, so that both torsional rigidity and sliding resistance are achieved. However, in order to improve the steering feeling, it has been desired to further improve the torsional rigidity and bending rigidity of the coupling portion.

特開２００１−７４０５６号公報JP 2001-74056 A

本発明は、アウターシャフトの雌セレーション溝とインナーシャフトの雄セレーション溝との結合部のねじり剛性と曲げ剛性をさらに向上させたスリット付きスライドジョイントを提供することを課題とする。   It is an object of the present invention to provide a slide joint with a slit that further improves the torsional rigidity and bending rigidity of the joint between the female serration groove of the outer shaft and the male serration groove of the inner shaft.

上記課題は以下の手段によって解決される。すなわち、第１番目の発明は、軸方向一端側の内周面に雌セレーション溝を有すると共に、軸方向一端側の端面が開放され他端側の端面が閉鎖された複数のスリットが形成された中空円筒状のアウターシャフトと、上記雌セレーション溝に内嵌して係合する雄セレーション溝が軸方向一端側の外周面に形成されたインナーシャフトと、上記アウターシャフトの軸方向一端側の外周面に外嵌され、このアウターシャフトの軸方向一端側の外径を弾性的に縮径する抑えリングとを備えたスリット付きスライドジョイントの製造方法において、中空円筒状の素材の軸方向一端側の外周面に、絞り加工によって縮径させた第一絞り部を形成する工程と、上記第一絞り部の円周方向等間隔位置に、上記第一絞り部の範囲内で、その軸方向一端側に開放された開放端部を有するスリットを形成する工程と、上記第一絞り部の内周面に雌セレーション溝を形成する工程と、上記スリットの軸方向一端側の開放端部から軸方向他端側の閉鎖端部近傍にわたって、上記アウターシャフトの外形寸法よりも小径の内径孔を有するダイスを上記アウターシャフトの外周面に圧入して絞り成形することによって、上記アウターシャフトの外径及び内径を縮径して第二絞り部を形成する工程と、先細の円錐台部が形成され、さらに先端には、雌セレーション溝に内嵌するガイド円筒部が形成された矯正パンチを上記第二絞り部における上記雌セレーション溝の内周面に圧入することによって、上記雌セレーション溝の自由状態での内径を、上記スリットの閉鎖端部近傍が最も小径で、スリットの開放端部に向かうほど大径に成形する工程とがこの順で行われることを特徴とするスリット付きスライドジョイントの製造方法である。
The above problem is solved by the following means. That is, the first invention has a female serration groove on the inner peripheral surface on one end side in the axial direction, and a plurality of slits in which the end surface on the one end side in the axial direction is opened and the end surface on the other end side is closed. A hollow cylindrical outer shaft, an inner shaft in which a male serration groove that fits and engages with the female serration groove is formed on an outer peripheral surface on one axial end side, and an outer peripheral surface on one axial end side of the outer shaft In the manufacturing method of the slide joint with slit , the outer periphery of the hollow cylindrical material on the one end side in the axial direction is provided. Forming a first drawn portion having a diameter reduced by drawing on the surface, and at equal circumferential positions of the first drawn portion within the range of the first drawn portion, on one end side in the axial direction thereof Open And forming a slit having an open end, forming a female serration grooves on the inner peripheral surface of the first throttle portion, from the open end of the axial end of the slit in the axial end The outer diameter and inner diameter of the outer shaft are reduced by press-fitting a die having an inner diameter hole smaller in diameter than the outer dimension of the outer shaft into the outer peripheral surface of the outer shaft and drawing it over the closed end. Forming a second constriction portion , a tapered truncated cone portion, and a correction punch having a guide cylindrical portion fitted in the female serration groove at the tip thereof, and a female punch in the second constriction portion. by press-fitting the inner peripheral surface of the serration groove and an inner diameter in a free state of the female serration grooves, it is the most small near the closed end of the slit, suited to the open end of the slit As a step of forming the large diameter of the production method of the slotted slide joint, characterized in that it is carried out in this order.

第２番目の発明は、第１番目の発明のスリット付きスライドジョイントの製造方法によって製造されたスリット付きスライドジョイントである。   2nd invention is the slide joint with a slit manufactured by the manufacturing method of the slide joint with a slit of 1st invention.

本発明のスリット付きスライドジョイントでは、スリットの軸方向一端側の開放端部から軸方向他端側の閉鎖端部近傍にわたって、アウターシャフトの外径及び内径を縮径しているため、雌セレーション溝と雄セレーション溝とが強く係合する位置の間の軸方向の間隔として、スリットの軸方向の長さとほぼ同一長さを確保できる。従って、アウターシャフトとインナーシャフトとの結合部の曲げ剛性及びねじり剛性を向上させることが可能となる。   In the slide joint with a slit of the present invention, the outer diameter and inner diameter of the outer shaft are reduced from the open end on the one end side in the axial direction to the closed end on the other end side in the axial direction. As an axial interval between the positions where the male serration groove and the male serration groove are strongly engaged, a length substantially the same as the axial length of the slit can be secured. Therefore, it is possible to improve the bending rigidity and torsional rigidity of the joint portion between the outer shaft and the inner shaft.

以下、図面に基づいて本発明の実施例を説明する。図１は本発明の実施例のスリット付きスライドジョイントのアウターシャフトを製造する工程を順番に示す断面図である。図２は図１の後工程を示す断面図である。図３は図２の後工程を示し、アウターシャフトの外径及び内径を縮径する絞り工程を示す断面図である。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view sequentially illustrating steps for manufacturing an outer shaft of a slide joint with a slit according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a post-process of FIG. FIG. 3 is a cross-sectional view showing a subsequent step of FIG. 2 and showing a drawing step for reducing the outer diameter and inner diameter of the outer shaft.

図４（１）は図３の後工程を示し、アウターシャフトの内径を拡径する工程を示す断面図であって、矯正パンチ挿入前の状態を示す。図４（２）は図４（１）のアウターシャフトの左側面図である。図５はアウターシャフトの内径を拡径する工程を示す断面図であって、矯正パンチ挿入後の状態を示す断面図である。図６は成形が終了したアウターシャフトと、アウターシャフトに組み付けるインナーシャフトを示し、（１）は組み付け前の状態を示す断面図、（２）は組み付け後の状態を示す断面図である。   FIG. 4A is a cross-sectional view showing a post-process of FIG. 3 and a process of enlarging the inner diameter of the outer shaft, showing a state before insertion of the correction punch. 4 (2) is a left side view of the outer shaft of FIG. 4 (1). FIG. 5 is a cross-sectional view showing a process of expanding the inner diameter of the outer shaft, and is a cross-sectional view showing a state after inserting the correction punch. FIG. 6 shows the outer shaft after molding and the inner shaft assembled to the outer shaft, (1) is a sectional view showing a state before assembly, and (2) is a sectional view showing a state after assembly.

図１から図５に、アウターシャフトの製造工程を示す。まず、図１（１）に示すように、中空円筒状の素材１０を用意する。そして、第一工程でこの素材１０の軸方向一端側（図１（１）の左側）の外周面に、プレスによる押し込み加工等の縮径加工を施す事により、第一絞り部２１を形成し、図１（２）に示す様な第一中間素材１１を形成する。   1 to 5 show the manufacturing process of the outer shaft. First, as shown in FIG. 1A, a hollow cylindrical material 10 is prepared. Then, in the first step, the first drawn portion 21 is formed by subjecting the outer peripheral surface of one end of the material 10 in the axial direction (left side of FIG. 1 (1)) to diameter reduction processing such as pressing with a press. 1st intermediate material 11 as shown in FIG. 1 (2) is formed.

次いで、第二工程として、上記第一中間素材１１の軸方向一端側（図１の左側）寄りの外周面の全周に、旋盤等を使用した切削加工により環状の係止凹部２２を形成して、図１（３）に示す様な第二中間素材１２を形成する。   Next, as a second step, an annular locking recess 22 is formed by cutting using a lathe or the like on the entire outer periphery of the first intermediate material 11 near the one axial end side (left side in FIG. 1). Thus, the second intermediate material 12 as shown in FIG. 1 (3) is formed.

次いで、第三工程として、上記第一絞り部２１の軸方向の範囲内で、円周方向等間隔（９０度間隔）位置に、プレスによる打抜き加工、あるいは機械加工により４個のスリット３を形成して、図２（１Ａ）、（１Ｂ）に示すような第三中間素材１３を形成する。なお、上記スリット３の数は、４個に限らず、２個、３個、５個あるいはそれ以上とすることもできる。図２（１Ｂ）は、図２（１Ａ）の左側面図である。スリット３は、軸方向一端側（図２（１Ａ）の左側）の端面が開放された開放端部３１を有し、軸方向他端側（図２（１Ａ）の右側）の端面が閉鎖された閉鎖端部３２を有する。   Next, as a third step, four slits 3 are formed by punching by a press or machining at equal circumferential positions (90-degree intervals) within the axial range of the first throttle portion 21. Then, the third intermediate material 13 as shown in FIGS. 2 (1A) and (1B) is formed. The number of slits 3 is not limited to four, but may be two, three, five, or more. FIG. 2 (1B) is a left side view of FIG. 2 (1A). The slit 3 has an open end 31 in which an end face on one end side in the axial direction (left side in FIG. 2 (1A)) is opened, and an end face on the other end side in the axial direction (right side in FIG. 2 (1A)) is closed. It has a closed end 32.

次いで、第四工程として、上記第三中間素材１３のうちの上記第一絞り部２１の内周面に、ブローチ加工により雌セレーション溝４を形成して、図２（２）に示す様な第四中間素材１４を形成する。なお、この雌セレーション溝４を形成した後の、上記第一絞り部２１の形状は、ブローチ加工による場合には軸方向にわたり直径が変化しないストレート形状になる。上記した第一工程から第四工程は、特許文献１に記載されているスリット付きスライドジョイント用のアウターシャフトの製造工程と同様であるため、詳しい説明は省略する。   Next, as a fourth step, a female serration groove 4 is formed by broaching on the inner peripheral surface of the first drawn portion 21 of the third intermediate material 13, and the second step as shown in FIG. Four intermediate materials 14 are formed. In addition, the shape of the said 1st aperture | diaphragm | squeeze part 21 after forming this female serration groove | channel 4 becomes a straight shape in which a diameter does not change over an axial direction in the case of broaching. Since the first to fourth steps described above are the same as the manufacturing steps of the outer shaft for the slide joint with slit described in Patent Document 1, detailed description thereof is omitted.

次いで、第五工程として、図３（１）に示す第四中間素材１４の第一絞り部２１の軸方向一端側（図３（１）の左側）からダイス５を圧入して、第一絞り部２１の軸方向一端側寄りの外周面に、絞り加工により第二絞り部２３を形成して、第一絞り部２１の外径及び内径を縮径し、図３（２）、図４に示すような第五中間素材１５を形成する。   Next, as a fifth step, the die 5 is press-fitted from one axial end side (the left side of FIG. 3 (1)) of the first throttle portion 21 of the fourth intermediate material 14 shown in FIG. The second drawn portion 23 is formed by drawing on the outer peripheral surface near the one end side in the axial direction of the portion 21 to reduce the outer diameter and the inner diameter of the first drawn portion 21, as shown in FIGS. A fifth intermediate material 15 as shown is formed.

第二絞り部２３は、スリット３の軸方向一端側の開放端部３１から、スリット３の軸方向他端側の閉鎖端部３２近傍にわたって形成されている。本発明の実施例では、ダイス５の内径寸法Ｄは例えばφ２３．８ｍｍ、第一絞り部２１の外径寸法ｄは例えばφ２４．１ｍｍに設定しているため、第一絞り部２１の外径及び内径が縮径する量は、直径で０．３ｍｍ程度になる。また、スリット３の軸方向長さＬ１（軸方向一端側の開放端部３１から軸方向他端側の閉鎖端部３２までの長さ）は３８ｍｍ、縮径部２３の軸方向長さＬ２は３３ｍｍに設定している。   The second diaphragm 23 is formed from the open end 31 on one end side in the axial direction of the slit 3 to the vicinity of the closed end portion 32 on the other end side in the axial direction of the slit 3. In the embodiment of the present invention, the inner diameter D of the die 5 is set to φ23.8 mm, for example, and the outer diameter d of the first throttle portion 21 is set to φ24.1 mm, for example. The amount by which the inner diameter is reduced is about 0.3 mm in diameter. The axial length L1 of the slit 3 (the length from the open end 31 on one axial end side to the closed end 32 on the other axial end side) is 38 mm, and the axial length L2 of the reduced diameter portion 23 is It is set to 33 mm.

次いで、第六工程として、この第五中間素材１５の軸方向一端側（各スリット３の開放端部３１側の端で、図４（１）の左端）開口部に、矯正パンチ６を対向させる。この矯正パンチ６の先端には、先細の円錐台部６１が形成され、円錐台部６１のテーパー角度は、矯正が最も容易な５度に設定しているが、１度から１０度の範囲であればよい。また、円錐台部６１のさらに先端には、雌セレーション溝４に内嵌するガイド円筒部６２が形成されている。   Next, as a sixth step, the correction punch 6 is made to face the opening of one end in the axial direction of the fifth intermediate material 15 (the end on the open end 31 side of each slit 3 and the left end in FIG. 4 (1)). . A tapered truncated cone part 61 is formed at the tip of the correction punch 6, and the taper angle of the truncated cone part 61 is set to 5 degrees, which is the easiest to correct, but in the range of 1 to 10 degrees. I just need it. Further, a guide cylindrical portion 62 that fits in the female serration groove 4 is formed at the further tip of the truncated cone portion 61.

このような矯正パンチ６を、第五中間素材１５の先端開口部に、図５に示す様に圧入する事により、ガイド円筒部６２が雌セレーション溝４に内嵌して円滑に挿入され、円錐台部６１で雌セレーション溝４の内径を拡径し、第五中間素材１５が、図５及び図６（１）に示すようなアウターシャフト２になる。   By inserting such a correction punch 6 into the tip opening of the fifth intermediate material 15 as shown in FIG. 5, the guide cylindrical portion 62 is fitted into the female serration groove 4 and is smoothly inserted. The inner diameter of the female serration groove 4 is increased by the base 61, and the fifth intermediate material 15 becomes the outer shaft 2 as shown in FIG. 5 and FIG. 6 (1).

上記矯正パンチ６の先端部を第五中間素材１５の先端開口部に押し込むと、円周方向に隣り合うスリット３、３同士の間に存在する間部分３３、３３（図４（２）参照）が、それぞれこれら各間部分３３、３３の軸方向他端側（各スリット３、３の閉鎖端部３２同士を結ぶ部分）を中心として、直径方向外方に折れ曲がる。   When the front end portion of the correction punch 6 is pushed into the front end opening portion of the fifth intermediate material 15, intermediate portions 33 and 33 existing between the slits 3 and 3 adjacent to each other in the circumferential direction (see FIG. 4 (2)). However, each of the inter-parts 33, 33 is bent outward in the diameter direction around the other axial end (the part connecting the closed ends 32 of the slits 3, 3).

各間部分３３、３３は、外周面側の軸方向にわたる形状は凹面となり、内周面側の軸方向にわたる形状が凸面となる。この結果、この第五中間素材１５を構成する上記各間部分３３、３３の内周面に形成した雌セレーション溝４の内径が、第二絞り部２３の軸方向他端側内径（スリット３の閉鎖端部３２近傍側の内径）２３１が最も小径となり、第二絞り部２３の軸方向一端側内径（スリット３の開放端部３１側の内径）２３２が最も大径となる。   Each of the intermediate portions 33, 33 has a concave shape in the axial direction on the outer peripheral surface side, and a convex shape in the axial direction on the inner peripheral surface side. As a result, the inner diameter of the female serration groove 4 formed on the inner peripheral surface of each of the intermediate portions 33 and 33 constituting the fifth intermediate material 15 is equal to the inner diameter on the other end side in the axial direction (the slit 3 of the slit 3). The inner diameter 231 near the closed end 32 is the smallest diameter, and the inner diameter on the one end side in the axial direction of the second throttle part 23 (the inner diameter on the open end 31 side of the slit 3) 232 is the largest.

次いで、図６に示すように、上記した第一工程から第六工程までの製造工程を経て成形されたアウターシャフト２にインナーシャフト７を組み付ける。図６（１）に示すように、インナーシャフト７は、軸方向一端側（図６の右側）を他端側（図６の左側）よりも大径にし、その外周面に上記雌セレーション溝４に内嵌して係合する雄セレーション溝７１を形成している。また、アウターシャフト２の係止凹部２２に外嵌する抑えリング８は、切目を持たずに全周にわたって連続する、短円筒状に形成している。   Next, as shown in FIG. 6, the inner shaft 7 is assembled to the outer shaft 2 formed through the manufacturing steps from the first step to the sixth step. As shown in FIG. 6 (1), the inner shaft 7 has one axial end (right side in FIG. 6) larger in diameter than the other end (left side in FIG. 6), and the female serration groove 4 is formed on the outer peripheral surface thereof. A male serration groove 71 is formed to be fitted inside and engaged. In addition, the holding ring 8 that is externally fitted to the locking recess 22 of the outer shaft 2 is formed in a short cylindrical shape that is continuous over the entire circumference without having a cut.

図６（２）に示すように、このアウターシャフト２の雌セレーション溝４内にインナーシャフト７の雄セレーション溝７１を挿入し、第二絞り部２３の軸方向一端側（スリット３の開放端部３１側）の直径を弾性的に縮めた状態で、係止凹部２２に抑えリング８を外嵌する。   As shown in FIG. 6 (2), the male serration groove 71 of the inner shaft 7 is inserted into the female serration groove 4 of the outer shaft 2, and one end side in the axial direction of the second throttle portion 23 (the open end of the slit 3). In the state where the diameter of the (31 side) is elastically contracted, the ring 8 is externally fitted to the retaining recess 22.

アウターシャフト２にインナーシャフト７を組み付けた状態では、雌セレーション溝４は、第二絞り部２３の軸方向他端側内径２３１と第二絞り部２３の軸方向一端側内径２３２の二箇所で、雄セレーション溝７１の外周に強く押し付けられる。   In the state where the inner shaft 7 is assembled to the outer shaft 2, the female serration groove 4 has two axial portions on the other end side inner diameter 231 of the second throttle portion 23 and one end inner diameter 232 in the axial direction of the second throttle portion 23. It is strongly pressed against the outer periphery of the male serration groove 71.

本発明の実施例では、軸方向他端側の係合位置が、従来例よりも、スリット３の閉鎖端部３２側に移動するため、雌セレーション溝４と雄セレーション溝７１とが強く係合する部分の間の軸方向の間隔が広がり、スリット３の軸方向の長さとほぼ同一長さを確保できる。従って、アウターシャフト２とインナーシャフト７との結合部の曲げ剛性及びねじり剛性が向上し、ステアリング装置の操舵感を向上させることができる。   In the embodiment of the present invention, the engagement position on the other axial end side moves to the closed end 32 side of the slit 3 as compared with the conventional example, so that the female serration groove 4 and the male serration groove 71 are strongly engaged. The space in the axial direction between the portions to be spread is widened, and the length substantially the same as the length of the slit 3 in the axial direction can be secured. Accordingly, the bending rigidity and torsional rigidity of the joint portion between the outer shaft 2 and the inner shaft 7 are improved, and the steering feeling of the steering device can be improved.

本発明の実施例では、中間シャフトに適用した例について説明したが、中間シャフトに限定されるものではなく、ステアリング装置に使用されるステアリングシャフト等に適用してもよい。   In the embodiment of the present invention, the example applied to the intermediate shaft has been described. However, the present invention is not limited to the intermediate shaft, and may be applied to a steering shaft or the like used in the steering device.

本発明の実施例のスリット付きスライドジョイントのアウターシャフトを製造する工程を順番に示す断面図である。It is sectional drawing which shows the process of manufacturing the outer shaft of the slide joint with a slit of the Example of this invention in order. 図１の後工程を示す断面図である。It is sectional drawing which shows the post process of FIG. 図２の後工程を示し、アウターシャフトの外径及び内径を縮径する絞り工程を示す断面図である。FIG. 4 is a cross-sectional view showing a post-process of FIG. 2 and showing a drawing process for reducing the outer diameter and inner diameter of the outer shaft. （１）は図３の後工程を示し、アウターシャフトの内径を拡径する工程を示す断面図であって、矯正パンチ挿入前の状態を示す。（２）は（１）のアウターシャフトの左側面図である。(1) shows the post-process of FIG. 3, and is a cross-sectional view showing a process of expanding the inner diameter of the outer shaft, showing a state before the correction punch is inserted. (2) is a left side view of the outer shaft of (1). アウターシャフトの内径を拡径する工程を示す断面図であって、矯正パンチ挿入後の状態を示す断面図である。It is sectional drawing which shows the process of expanding the inner diameter of an outer shaft, Comprising: It is sectional drawing which shows the state after correction | amendment punch insertion. 成形が終了したアウターシャフトと、アウターシャフトに挿入するインナーシャフトを示し、（１）は組み付け前の状態を示す断面図、（２）は組み付け後の状態を示す断面図である。The outer shaft after shaping | molding and the inner shaft inserted in an outer shaft are shown, (1) is sectional drawing which shows the state before an assembly | attachment, (2) is sectional drawing which shows the state after an assembly | attachment.

符号の説明Explanation of symbols

１０ 素材
１１ 第一中間素材
１２ 第二中間素材
１３ 第三中間素材
１４ 第四中間素材
１５ 第五中間素材
２ アウターシャフト
２１ 第一絞り部
２２ 係止凹部
２３ 第二絞り部
２３１ 軸方向他端側内径
２３２ 軸方向一端側内径
３ スリット
３１ 開放端部
３２ 閉鎖端部
３３ 間部分
４ 雌セレーション溝
５ ダイス
６ 矯正パンチ
６１ 円錐台部
６２ ガイド円筒部
７ インナーシャフト
７１ 雄セレーション溝
８ 抑えリング DESCRIPTION OF SYMBOLS 10 Material 11 1st intermediate material 12 2nd intermediate material 13 3rd intermediate material 14 4th intermediate material 15 5th intermediate material 2 Outer shaft 21 1st aperture part 22 Locking recessed part 23 2nd aperture part 231 Axial direction other end side Inner diameter 232 Axial one end inner diameter 3 Slit 31 Open end 32 Closed end 33 Intersection 4 Female serration groove 5 Dies 6 Straightening punch 61 Frustum section 62 Guide cylindrical section 7 Inner shaft 71 Male serration groove 8 Retaining ring

Claims (2)

軸方向一端側の内周面に雌セレーション溝を有すると共に、軸方向一端側の端面が開放され他端側の端面が閉鎖された複数のスリットが形成された中空円筒状のアウターシャフトと、
上記雌セレーション溝に内嵌して係合する雄セレーション溝が軸方向一端側の外周面に形成されたインナーシャフトと、
上記アウターシャフトの軸方向一端側の外周面に外嵌され、このアウターシャフトの軸方向一端側の外径を弾性的に縮径する抑えリングとを備えたスリット付きスライドジョイントの製造方法において、
中空円筒状の素材の軸方向一端側の外周面に、絞り加工によって縮径させた第一絞り部を形成する工程と、
上記第一絞り部の円周方向等間隔位置に、上記第一絞り部の範囲内で、その軸方向一端側に開放された開放端部を有するスリットを形成する工程と、
上記第一絞り部の内周面に雌セレーション溝を形成する工程と、
上記スリットの軸方向一端側の開放端部から軸方向他端側の閉鎖端部近傍にわたって、上記アウターシャフトの外形寸法よりも小径の内径孔を有するダイスを上記アウターシャフトの外周面に圧入して絞り成形することによって、上記アウターシャフトの外径及び内径を縮径して第二絞り部を形成する工程と、
先細の円錐台部が形成され、さらに先端には、雌セレーション溝に内嵌するガイド円筒部が形成された矯正パンチを上記第二絞り部における上記雌セレーション溝の内周面に圧入することによって、上記雌セレーション溝の自由状態での内径を、上記スリットの閉鎖端部近傍が最も小径で、スリットの開放端部に向かうほど大径に成形する工程と
がこの順で行われること
を特徴とするスリット付きスライドジョイントの製造方法。 A hollow cylindrical outer shaft having a female serration groove on the inner peripheral surface on one end side in the axial direction and having a plurality of slits in which the end surface on the one end side in the axial direction is opened and the end surface on the other end side is closed,
An inner shaft in which a male serration groove that fits and engages with the female serration groove is formed on the outer peripheral surface on one end side in the axial direction;
In the manufacturing method of the slide joint with slit, which is fitted on the outer peripheral surface of the outer shaft on one end side in the axial direction of the outer shaft, and includes a restraining ring that elastically reduces the outer diameter on the one end side in the axial direction of the outer shaft.
Forming a first drawn portion reduced in diameter by drawing on the outer peripheral surface on one axial end side of the hollow cylindrical material; and
Forming a slit having an open end that is open on one end side in the axial direction within the range of the first restrictor at the circumferentially equidistant positions of the first restrictor; and
Forming a female serration groove on the inner peripheral surface of the first throttle portion;
A die having an inner diameter hole smaller than the outer dimension of the outer shaft is press-fitted into the outer peripheral surface of the outer shaft from the open end on one end in the axial direction of the slit to the vicinity of the closed end on the other end in the axial direction. Forming the second drawn portion by reducing the outer diameter and inner diameter of the outer shaft by drawing ;
By forming a tapered truncated cone part and, at the tip, a correction punch having a guide cylindrical part fitted into the female serration groove is press-fitted into the inner peripheral surface of the female serration groove in the second throttle part. , an inner diameter in a free state of the female serration groove, at the closed end near the smallest diameter of the slit, the step of forming the large diameter increases toward the open end of the slit
Are performed in this order, and the manufacturing method of the slide joint with a slit characterized by the above-mentioned. 請求項１に記載されたスリット付きスライドジョイントの製造方法によって製造されたスリット付きスライドジョイント。   The slide joint with a slit manufactured by the manufacturing method of the slide joint with a slit described in Claim 1.
JP2005351423A 2005-12-06 2005-12-06 Slide joint with slit and manufacturing method thereof Expired - Fee Related JP4687428B2 (en)

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US20140200086A1 (en) 2011-11-30 2014-07-17 Nsk Ltd. Telescopic shaft
CN103821831B (en) * 2014-02-20 2016-08-17 上海理工大学 Variable-section variable wall thickness is swaged axle light-weight design method
CN104833331B (en) * 2015-05-22 2017-07-11 上海理工大学 The inside/outside diameter size of axis blank of being swaged in the middle of car constant-speed Universal drive determines method
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Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH10109557A (en) * 1996-10-03 1998-04-28 Toyota Motor Corp Axial member and propeller shaft
JPH11247835A (en) * 1998-03-04 1999-09-14 Nippon Seiko Kk Hollow steering shaft, its manufacture, and tool for manufacturing hollow steering shaft
JP2001074056A (en) * 1999-09-03 2001-03-23 Nsk Ltd Slide joint with slit and its manufacture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10109557A (en) * 1996-10-03 1998-04-28 Toyota Motor Corp Axial member and propeller shaft
JPH11247835A (en) * 1998-03-04 1999-09-14 Nippon Seiko Kk Hollow steering shaft, its manufacture, and tool for manufacturing hollow steering shaft
JP2001074056A (en) * 1999-09-03 2001-03-23 Nsk Ltd Slide joint with slit and its manufacture

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