JP3614554B2 - Intermediate shaft of steering device - Google Patents

Intermediate shaft of steering device Download PDF

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Publication number
JP3614554B2
JP3614554B2 JP5591296A JP5591296A JP3614554B2 JP 3614554 B2 JP3614554 B2 JP 3614554B2 JP 5591296 A JP5591296 A JP 5591296A JP 5591296 A JP5591296 A JP 5591296A JP 3614554 B2 JP3614554 B2 JP 3614554B2
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Japan
Prior art keywords
shaft
press
fitted
hollow
hollow shaft
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JP5591296A
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JPH09240493A (en
Inventor
博憲 小谷
周三 平櫛
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Koyo Seiko Co Ltd
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Koyo Seiko Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、自動車のステアリング装置において、ステアリングシャフトとステアリングギアとの間に設けられる中間軸に係り、特に、所要以上の衝撃荷重を受けたときに軸方向に短縮して衝撃吸収する構成の中間軸に関する。
【０００２】
【従来の技術】
図３は、自動車の一般的なステアリング装置の構成を示している。図中、１はステアリングホイール、２はステアリングコラム、３はステアリングシャフト、４はステアリングギア、５，６は自在継手、７は中間軸である。
【０００３】
中間軸７は、ステアリングホイール１に加わる回転操作力をステアリングギア４側に伝達するだけでなく、衝突時等に過大な衝撃が加わったとき、その衝撃が運転者側に伝わらないよう、短縮して衝撃を吸収する構造になっている。
【０００４】
図４は、中間軸の要部破断の側面図である。中間軸７は、互いに軸方向変位可能に連結される中空軸８と挿入軸９とからなる。中空軸８の内周には雌セレーション８ａが設けられており、挿入軸９の先端側の外周には前記雌セレーション８ａに噛合する雄セレーション９ａが設けられている。この挿入軸９の雄セレーション８ａの形成領域の途中部分の外周には、周溝１０が形成されている。一方、中空軸８において前記周溝１０に対応する領域で１８０度対向する二箇所には、径方向に貫通する孔１１が設けられている。そして、この孔１１を通じて周溝１０と中空軸８との間の間隙に樹脂１２が充填されており、この充填樹脂１２の固化により、中空軸８と挿入軸９とが一体的に結合されている。
【０００５】
このような構成の中間軸７では、過大な衝撃が加わると、充填樹脂１２の軸方向の引っ掛かり部分が剪断されることになり、中空軸８内に挿入軸９が入り込んで中間軸７全体が短縮し、これによって衝撃を吸収するようになっている。
【０００６】
【発明が解決しようとする課題】
ところで、上記従来例では、組立時に、充填樹脂１２の注入、硬化作業が必要であるために手間がかかるなど、作業効率が悪く、製作費が嵩むことが指摘される。
【０００７】
また、使用場所が高温になりやすいエンジンルーム内であるため、充填樹脂１２の強度が低下して所要の剪断抵抗が得られなくなるおそれがあるなど、抜け荷重がばらつくおそれがある。なお、抜け荷重とは、中間軸７を短縮するときの衝撃荷重のことである。
【０００８】
したがって、本発明は、ステアリング装置の中間軸において、製造工程や組立工程での無駄を無くし、コスト低減を図ることを目的とする。また、本発明は、雰囲気温度に関係なく抜け荷重を一定に管理できるようにすることも目的としている。
【０００９】
【課題を解決するための手段】
本発明は、所要以上の衝撃荷重を受けたときに軸方向に圧縮して衝撃吸収するステアリング装置の中間軸において、次のように構成する。
【００１０】
本発明の第１のステアリング装置の中間軸は、所要以上の衝撃荷重を受けたときに軸方向に短縮して衝撃吸収するステアリング装置の中間軸であって、中空軸と、この中空軸の内部に軸方向変位可能に挿入される挿入軸とからなり、かつ、前記挿入軸の端部が前記中空軸の端部に対して圧入されているとともに、この圧入荷重が前記衝撃荷重に基づき設定され、前記挿入軸の前記中空軸へ圧入される部分の外周は圧入されていない部分よりも拡径され、さらに、前記挿入軸の前記中空軸への圧入部分は中空となっており、前記挿入軸の前記中空軸へ圧入されていない部分が中実となっている、ことを特徴とする。
【００１２】
本発明の第２の中間軸は、内周に雌セレーションを有する中空軸と、外周に前記中空軸の雌セレーションに噛合する雄セレーションを有する挿入軸とからなり、かつ、前記挿入軸の端部が拡径されていて、この挿入軸の拡径部が中空軸の端部に対して圧入されているとともに、圧入荷重が前記衝撃荷重に基づき設定され、前記挿入軸の前記中空軸へ圧入される部分の外周は圧入されていない部分よりも拡径され、さらに、前記挿入軸の前記中空軸への圧入部分は中空となっており、前記挿入軸の前記中空軸へ圧入されていない部分が中実となっている。本発明の第３の中間軸は、中空軸と、この中空軸の内部に軸方向変位可能に挿入される挿入軸とからなり、かつ、挿入軸が前記中空軸の一端側から所定長さ圧入されているとともに、この圧入荷重が前記衝撃荷重に基づき設定され、前記挿入軸の前記中空軸へ圧入される部分の外周は圧入されていない部分よりも拡径され、さらに、前記挿入軸の前記中空軸への圧入部分は中空となっており、前記挿入軸の前記中空軸へ圧入されていない部分が中実となっている。
【００１３】
上記本発明では、中空軸と挿入軸とを圧入による摩擦抵抗でもって結合している。このため、組立は圧入作業だけと簡単になる上、抜け荷重（衝撃荷重）が使用雰囲気温度に影響されて変化することがない。しかも、圧入時のしめしろや圧入幅などによって、圧入荷重を簡単に可変設定できるようになる。
【００１４】
そして、圧入のために挿入軸の端部を拡径する構造とした場合には、場所的に加工が簡単になり、しかも圧入荷重を設定するための寸法管理が高精度に行えるようになる。
【００１５】
【発明の実施の形態】
本発明の詳細を図１および図２に示す実施例に基づいて説明する。
【００１６】
図１および図２は本発明の一実施例にかかり、図１は、中間軸の要部破断の側面図、図２は、中間軸の分解図である。
【００１７】
図中、５および６は自在継手、７は中間軸である。中間軸７は、互いに軸方向変位可能に連結される中空軸８と挿入軸９とからなる。
【００１８】
中空軸８は、内周に雌セレーション８ａが形成されている。挿入軸９は、外周に中空軸８の雌セレーション８ａに噛合する雄セレーション９ａが形成されており、さらに中空軸８への挿入側端部は、他の部分よりも拡径されている。この拡径部に符号９ｂを付してある。この拡径部９ｂの外周にも、雄セレーション９ａが設けられている。なお、挿入軸９は、例えば母材となる軸体の外周に雄セレーション９ａを形成した後、その一方軸端を必要に応じて内径から加工型を押し込むなどして拡径部９ｂを簡単に形成することができ、しかも寸法管理が高精度に行える。本実施例の挿入軸９の場合、拡径部９ｂを設けているものの、従来例の周溝が無いので、製作工程数は同じとなる。
【００１９】
そして、挿入軸９の拡径部９ｂが、中空軸８の端部に対して圧入嵌合されている。この圧入部分では、中空軸８と挿入軸９の各セレーションの山部分が谷部分に食い込んだ形態になっている。この圧入荷重は、要求される衝撃荷重に基づき、圧入時のしめしろと圧入幅とにより任意に可変設定することができる。なお、圧入荷重は、挿入軸９が中空軸８の内方へ入り込んで中間軸７を短縮するときの衝撃荷重つまり抜け荷重と一定の関係が成り立つものである。例えば、圧入荷重を５００Ｋｇｆに設定した場合、５００Ｋｇｆ以上の衝撃荷重を受けると、中空軸８と挿入軸９との結合が解除されることになり、それで衝撃が吸収されることになる。これ以降、挿入軸９が中空軸８の内方へ各セレーション８ａ，９ａによって抵抗少なく入り込んで所要量短縮することになる。この場合、従来例の樹脂の剪断を利用した衝撃吸収構造のように、使用雰囲気温度による劣化がなく、抜け荷重が一定に維持されるので、信頼性が高い。
【００２０】
このような中間軸７の場合、それを構成する中空軸８については従来例のような樹脂の引っ掛かかりとなる孔を設ける必要がないので製作工数を少なくでき、また、挿入軸９については従来例のものとほぼ同じ工数にできる。しかも、組立作業としては、中空軸８に対して挿入軸９を単に圧入するだけの簡単なもので済み、従来のような充填樹脂の注入、硬化工程が不要となる。したがって、組立作業を簡略化できてコストを低減できるようになる。
【００２１】
なお、本発明は上記実施例に限定されるものではなく、例えば中空軸８と挿入軸９とはセレーション嵌合せずにスプライン嵌合とするものであってもよい。また、挿入軸９は、中空軸８との圧入部分のみを中空として、他の部分を中実としたものである。さらに、挿入軸９は、拡径部９ｂの内径寸法を他の部分の内径寸法と同一に設定して外周のみを膨出させたもの、つまり拡径部９ｂを他の部分よりも厚肉としたものでもよい。この他、挿入軸９の拡径部９ｂに雄セレーション９ａを設けていないものも含む。
【００２２】
【発明の効果】
本発明では、使用雰囲気温度の影響による劣化がなく、抜け荷重を一定に維持できるので、高い信頼性が得られる。また、圧入部分を寸法管理することによって抜け荷重を任意に設定することができるので、要求される衝撃荷重に応じて簡単かつ正確に幅広く対応できるようになる。しかも、組立時に、従来のような手間のかかる作業を必要としないから、コスト低減に貢献できて、比較的安価に実現できるようになる。
【図面の簡単な説明】
【図１】本発明の一実施例の中間軸の要部破断の側面図
【図２】図１の中間軸の分解図
【図３】一般的なステアリング装置の構成を示す側面図
【図４】従来の中間軸の要部破断の側面図
【符号の説明】
７ 中間軸
８ 中空軸
８ａ 中空軸の雌セレーション
９ 挿入軸
９ａ 挿入軸の雄セレーション
９ｂ 挿入軸の拡径部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intermediate shaft provided between a steering shaft and a steering gear in a steering apparatus for an automobile, and in particular, an intermediate structure that absorbs shock by shortening in the axial direction when receiving an impact load more than necessary. Regarding the axis.
[0002]
[Prior art]
FIG. 3 shows a configuration of a general steering device of an automobile. In the figure, 1 is a steering wheel, 2 is a steering column, 3 is a steering shaft, 4 is a steering gear, 5 and 6 are universal joints, and 7 is an intermediate shaft.
[0003]
The intermediate shaft 7 not only transmits the rotational operation force applied to the steering wheel 1 to the steering gear 4 side, but also shortens the impact so that it is not transmitted to the driver side when an excessive impact is applied during a collision or the like. To absorb shock.
[0004]
FIG. 4 is a side view of a main part fracture of the intermediate shaft. The intermediate shaft 7 includes a hollow shaft 8 and an insertion shaft 9 that are connected to each other so as to be axially displaceable. A female serration 8 a is provided on the inner periphery of the hollow shaft 8, and a male serration 9 a that meshes with the female serration 8 a is provided on the outer periphery on the distal end side of the insertion shaft 9. A circumferential groove 10 is formed on the outer periphery of the middle portion of the formation region of the male serration 8a of the insertion shaft 9. On the other hand, holes 11 penetrating in the radial direction are provided at two locations facing each other by 180 degrees in the region corresponding to the circumferential groove 10 in the hollow shaft 8. A resin 12 is filled in the gap between the circumferential groove 10 and the hollow shaft 8 through the hole 11, and the hollow shaft 8 and the insertion shaft 9 are integrally coupled by solidification of the filling resin 12. Yes.
[0005]
In the intermediate shaft 7 having such a configuration, when an excessive impact is applied, the hooked portion of the filling resin 12 in the axial direction is sheared, and the insertion shaft 9 enters the hollow shaft 8 so that the entire intermediate shaft 7 is entirely removed. It is shortened so that it can absorb shocks.
[0006]
[Problems to be solved by the invention]
By the way, it is pointed out that in the above-mentioned conventional example, the work efficiency is low and the manufacturing cost increases because it takes time and labor to inject and cure the filling resin 12 during assembly.
[0007]
Further, since the place of use is in the engine room where the temperature tends to be high, the strength of the filling resin 12 may be reduced, and the required shear resistance may not be obtained, and there is a possibility that the loose load may vary. The slip-out load is an impact load when the intermediate shaft 7 is shortened.
[0008]
Accordingly, an object of the present invention is to eliminate the waste in the manufacturing process and the assembling process in the intermediate shaft of the steering device, and to reduce the cost. Another object of the present invention is to make it possible to manage the removal load uniformly regardless of the ambient temperature.
[0009]
[Means for Solving the Problems]
The present invention is configured as follows in an intermediate shaft of a steering device that compresses in the axial direction and absorbs an impact when receiving an impact load more than necessary.
[0010]
The intermediate shaft of the first steering device of the present invention is an intermediate shaft of the steering device that absorbs shock by shortening in the axial direction when receiving an impact load more than necessary, and includes a hollow shaft and an interior of the hollow shaft. consists axial displaceably inserted the insertion axis to and together with an end portion of the insertion shaft is press-fitted to the end portion of the hollow shaft, the press-fitting load is set on the basis of the impact load The outer periphery of the portion of the insertion shaft that is press-fitted into the hollow shaft is larger in diameter than the portion that is not press-fitted, and the press-fitted portion of the insertion shaft into the hollow shaft is hollow. The portion that is not press-fitted into the hollow shaft is solid .
[0012]
The second intermediate shaft of the present invention comprises a hollow shaft having a female serration on the inner periphery and an insertion shaft having a male serration meshing with the female serration of the hollow shaft on the outer periphery, and an end portion of the insertion shaft The expanded diameter portion of the insertion shaft is press-fitted into the end portion of the hollow shaft, and the press-fit load is set based on the impact load and is press-fitted into the hollow shaft of the insertion shaft. The outer circumference of the portion to be inserted is larger than the portion that is not press-fitted, and the press-fitted portion of the insertion shaft to the hollow shaft is hollow, and the portion of the insertion shaft that is not press-fitted to the hollow shaft is It is solid. The third intermediate shaft of the present invention comprises a hollow shaft and an insertion shaft inserted into the hollow shaft so as to be axially displaceable, and the insertion shaft is press-fitted for a predetermined length from one end side of the hollow shaft. And the press-fitting load is set based on the impact load, the outer periphery of the portion of the insertion shaft that is press-fitted into the hollow shaft is expanded in diameter than the portion that is not press-fitted, and the insertion shaft The press-fitted portion into the hollow shaft is hollow, and the portion of the insertion shaft that is not press-fitted into the hollow shaft is solid.
[0013]
In the above-mentioned present invention, the hollow shaft and the insertion shaft are coupled with frictional resistance by press-fitting. For this reason, the assembly is simplified only by the press-fitting operation, and the removal load (impact load) is not affected by the use ambient temperature and changes. In addition, the press-fit load can be easily variably set according to the interference and press-fit width during press-fit.
[0014]
If the structure is such that the end of the insertion shaft is expanded for press-fitting, the processing is easy in terms of location, and dimension management for setting the press-fitting load can be performed with high accuracy.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Details of the present invention will be described based on the embodiment shown in FIGS.
[0016]
1 and 2 relate to one embodiment of the present invention, FIG. 1 is a side view of a main part fracture of the intermediate shaft, and FIG. 2 is an exploded view of the intermediate shaft.
[0017]
In the figure, 5 and 6 are universal joints, and 7 is an intermediate shaft. The intermediate shaft 7 includes a hollow shaft 8 and an insertion shaft 9 that are connected to each other so as to be axially displaceable.
[0018]
The hollow shaft 8 has a female serration 8a formed on the inner periphery. The insertion shaft 9 is formed with a male serration 9a meshing with the female serration 8a of the hollow shaft 8 on the outer periphery, and the insertion-side end to the hollow shaft 8 has a larger diameter than other portions. Reference numeral 9b is attached to the enlarged diameter portion. A male serration 9a is also provided on the outer periphery of the enlarged diameter portion 9b. For example, the insertion shaft 9 is formed with a male serration 9a on the outer periphery of a shaft body serving as a base material, and then the one end of the shaft is pushed into the processing die from the inner diameter as necessary. It can be formed, and dimensional control can be performed with high accuracy. In the case of the insertion shaft 9 of the present embodiment, although the enlarged diameter portion 9b is provided, the number of manufacturing steps is the same because there is no peripheral groove of the conventional example.
[0019]
The enlarged-diameter portion 9 b of the insertion shaft 9 is press-fitted to the end portion of the hollow shaft 8. In this press-fitted portion, the ridge portions of the serrations of the hollow shaft 8 and the insertion shaft 9 are in the form of biting into the valley portions. This press-fit load can be arbitrarily variably set according to the interference and press-fit width during press-fit based on the required impact load. The press-fit load has a certain relationship with the impact load, that is, the removal load when the insertion shaft 9 enters the inside of the hollow shaft 8 to shorten the intermediate shaft 7. For example, when the press-fit load is set to 500 kgf, when receiving an impact load of 500 kgf or more, the coupling between the hollow shaft 8 and the insertion shaft 9 is released, and the impact is absorbed thereby. Thereafter, the insertion shaft 9 enters the inside of the hollow shaft 8 with less resistance by the serrations 8a and 9a, and the required amount is shortened. In this case, unlike the conventional shock absorbing structure utilizing the shearing of the resin, there is no deterioration due to the ambient temperature, and the removal load is kept constant, so that the reliability is high.
[0020]
In the case of such an intermediate shaft 7, it is not necessary to provide holes for resin catching as in the case of the hollow shaft 8 constituting the intermediate shaft 7, so that the number of manufacturing steps can be reduced. The man-hour can be made almost the same as that of the conventional example. In addition, the assembly work can be as simple as simply press-fitting the insertion shaft 9 into the hollow shaft 8, and the conventional filling resin injection and curing steps are not required. Therefore, the assembly work can be simplified and the cost can be reduced.
[0021]
In addition, this invention is not limited to the said Example, For example, the hollow shaft 8 and the insertion shaft 9 may be made into spline fitting, without carrying out serration fitting. In addition, the insertion shaft 9 is hollow only in the press-fitted portion with the hollow shaft 8, and the other portion is solid . Furthermore, the insertion shaft 9 has an inner diameter dimension of the enlarged diameter portion 9b set to be the same as an inner diameter dimension of the other portion, and is expanded only at the outer periphery, that is, the enlarged diameter portion 9b is thicker than the other portion. You may have done. In addition to this, there is also included a member in which the male serration 9 a is not provided in the enlarged diameter portion 9 b of the insertion shaft 9.
[0022]
【The invention's effect】
In the present invention, there is no deterioration due to the influence of the use atmosphere temperature, and the removal load can be kept constant, so that high reliability can be obtained. In addition, the removal load can be arbitrarily set by managing the dimensions of the press-fitted portion, so that a wide range can be easily and accurately handled according to the required impact load. In addition, since no time-consuming work is required at the time of assembly, it can contribute to cost reduction and can be realized at a relatively low cost.
[Brief description of the drawings]
FIG. 1 is a side view of a main part fracture of an intermediate shaft according to an embodiment of the present invention. FIG. 2 is an exploded view of the intermediate shaft of FIG. ] Side view of main part fracture of conventional intermediate shaft [Explanation of symbols]
7 Intermediate shaft 8 Hollow shaft 8a Female serration 9 of hollow shaft Insertion shaft 9a Male serration 9b of insertion shaft Expanded diameter portion of insertion shaft

Claims (3)

所要以上の衝撃荷重を受けたときに軸方向に短縮して衝撃吸収するステアリング装置の中間軸であって、
中空軸と、この中空軸の内部に軸方向変位可能に挿入される挿入軸とからなり、かつ、前記挿入軸の端部が前記中空軸の端部に対して圧入されているとともに、この圧入荷重が前記衝撃荷重に基づき設定され、前記挿入軸の前記中空軸へ圧入される部分の外周は圧入されていない部分よりも拡径され、さらに、前記挿入軸の前記中空軸への圧入部分は中空となっており、前記挿入軸の前記中空軸へ圧入されていない部分が中実となっている、ことを特徴とするステアリング装置の中間軸。An intermediate shaft of the steering device that absorbs shock by shortening in the axial direction when receiving an impact load more than necessary,
And the hollow shaft, the inside of the hollow shaft consists of a axially displaceably inserted the insertion axis, and with an end portion of the insertion shaft is press-fitted to the end portion of the hollow shaft, the press fit The load is set based on the impact load, the outer periphery of the portion of the insertion shaft that is press-fitted into the hollow shaft is expanded in diameter than the portion that is not press-fitted, and the press-fitted portion of the insertion shaft into the hollow shaft is An intermediate shaft of a steering apparatus, characterized in that a hollow portion of the insertion shaft that is not press-fitted into the hollow shaft is solid . 所要以上の衝撃荷重を受けたときに軸方向に短縮して衝撃吸収するステアリング装置の中間軸であって、
内周に雌セレーションを有する中空軸と、外周に前記中空軸の雌セレーションに噛合する雄セレーションを有する挿入軸とからなり、
かつ、前記挿入軸の端部が拡径されていて、この挿入軸の拡径部が中空軸の端部に対して圧入されているとともに、圧入荷重が前記衝撃荷重に基づき設定され、前記挿入軸の前記中空軸へ圧入される部分の外周は圧入されていない部分よりも拡径され、さらに、前記挿入軸の前記中空軸への圧入部分は中空となっており、前記挿入軸の前記中空軸へ圧入されていない部分が中実となっている、ことを特徴とするステアリング装置の中間軸。An intermediate shaft of the steering device that absorbs shock by shortening in the axial direction when receiving an impact load more than necessary,
A hollow shaft having a female serration on the inner periphery and an insertion shaft having a male serration meshing with the female serration of the hollow shaft on the outer periphery;
And the end of the insertion shaft is expanded in diameter, the expanded diameter portion of the insertion shaft is press-fitted into the end of the hollow shaft, and the press-fitting load is set based on the impact load, and the insertion The outer periphery of the portion of the shaft that is press-fitted into the hollow shaft is larger in diameter than the portion that is not press-fitted, and the press-fitted portion of the insertion shaft into the hollow shaft is hollow, and the hollow of the insertion shaft An intermediate shaft of a steering device, wherein a portion not press-fitted into the shaft is solid . 所要以上の衝撃荷重を受けたときに軸方向に短縮して衝撃吸収するステアリング装置の中間軸であって、
中空軸と、この中空軸の内部に軸方向変位可能に挿入される挿入軸とからなり、かつ、挿入軸が前記中空軸の一端側から所定長さ圧入されているとともに、この圧入荷重が前記衝撃荷重に基づき設定され、前記挿入軸の前記中空軸へ圧入される部分の外周は圧入されていない部分よりも拡径され、さらに、前記挿入軸の前記中空軸への圧入部分は中空となっており、前記挿入軸の前記中空軸へ圧入されていない部分が中実となっている、ことを特徴とするステアリング装置の中間軸。An intermediate shaft of the steering device that absorbs shock by shortening in the axial direction when receiving an impact load more than necessary,
A hollow shaft and an insertion shaft inserted into the hollow shaft so as to be axially displaceable , and the insertion shaft is press-fitted for a predetermined length from one end of the hollow shaft , and the press-fitting load is The outer periphery of the portion that is set based on the impact load and is press-fitted into the hollow shaft of the insertion shaft is larger in diameter than the portion that is not press-fitted, and the press-fitted portion of the insertion shaft into the hollow shaft is hollow. An intermediate shaft of the steering device , wherein a portion of the insertion shaft that is not press-fitted into the hollow shaft is solid .
JP5591296A 1996-03-13 1996-03-13 Intermediate shaft of steering device Expired - Fee Related JP3614554B2 (en)

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JP5013162B2 (en) * 2006-03-28 2012-08-29 株式会社ジェイテクト Steering shaft

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JPS485776Y1 (en) * 1968-07-01 1973-02-14
JPS523219Y2 (en) * 1972-10-12 1977-01-24
JPS5576764U (en) * 1978-11-21 1980-05-27
JPS62143763A (en) * 1985-12-17 1987-06-27 Masanobu Nakamura Handle shaft
JPH0351673A (en) * 1989-07-19 1991-03-06 Mitsubishi Electric Corp Heat pump type cooling or heating device
JP2602139Y2 (en) * 1991-10-31 1999-12-27 日本精工株式会社 Shock absorbing steering shaft
JP2578295Y2 (en) * 1992-07-07 1998-08-06 日本精工株式会社 Shock absorbing steering shaft
JP3168841B2 (en) * 1994-09-22 2001-05-21 日本精工株式会社 Manufacturing method of shock absorbing steering shaft
JPH0891231A (en) * 1994-09-22 1996-04-09 Koyo Mach Ind Co Ltd Impact absorbing shaft structure for steering device and its manufacture
JPH08145069A (en) * 1994-11-21 1996-06-04 Koyo Seiko Co Ltd Shaft coupling
JP3605438B2 (en) * 1995-06-14 2004-12-22 本田技研工業株式会社 Vehicle steering device

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