JP6528848B2 - Yoke integrated shaft and telescopic shaft - Google Patents

Yoke integrated shaft and telescopic shaft Download PDF

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JP6528848B2
JP6528848B2 JP2017535503A JP2017535503A JP6528848B2 JP 6528848 B2 JP6528848 B2 JP 6528848B2 JP 2017535503 A JP2017535503 A JP 2017535503A JP 2017535503 A JP2017535503 A JP 2017535503A JP 6528848 B2 JP6528848 B2 JP 6528848B2
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axial
yoke
shaft
curved surface
surface portion
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JPWO2017030059A1 (en
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祥史 黒川
祥史 黒川
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
    • F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
    • F16D3/382—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another constructional details of other than the intermediate member
    • F16D3/387—Fork construction; Mounting of fork on shaft; Adapting shaft for mounting of fork
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
    • F16D1/10—Quick-acting couplings in which the parts are connected by simply bringing them together axially
    • F16D2001/103—Quick-acting couplings in which the parts are connected by simply bringing them together axially the torque is transmitted via splined connections

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Steering Controls (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Description

本発明は、自在継手用のヨークとインナシャフトとを一体化して成るヨーク一体型シャフト、及び、前記ヨーク一体型シャフトを含んで構成される伸縮軸の改良に関する。   The present invention relates to improvement of a yoke-integrated shaft in which a yoke for a universal joint and an inner shaft are integrated and an extension shaft including the yoke-integrated shaft.

自動車のステアリング装置は、図７に示す様に構成されている（例えば、特許文献１参照）。運転者が操作するステアリングホイール１の動きは、ステアリングシャフト２、自在継手３ａ、中間シャフト４、別の自在継手３ｂを介して、ステアリングギヤユニット５の入力軸６に伝達される。この結果、ステアリングギヤユニット５に内蔵したラックアンドピニオン機構により左右１対のタイロッド７、７が押し引きされる事により、左右１対の操舵輪に、ステアリングホイール１の操作量に応じた舵角が付与される。尚、図示のステアリング装置には、電動モータ８により、運転者がステアリングホイール１に加えた力に応じた補助力をステアリングシャフト２に付与する、電動アシスト装置が組み込まれている。   A steering apparatus of a car is configured as shown in FIG. 7 (see, for example, Patent Document 1). The movement of the steering wheel 1 operated by the driver is transmitted to the input shaft 6 of the steering gear unit 5 via the steering shaft 2, the universal joint 3a, the intermediate shaft 4 and another universal joint 3b. As a result, the left and right tie rods 7, 7 are pushed and pulled by the rack and pinion mechanism built in the steering gear unit 5, whereby the steering angle according to the operation amount of the steering wheel 1 is applied to the left and right steered wheels. Is granted. In the steering device shown in the figure, an electric assist device is incorporated that applies an assisting force corresponding to the force applied by the driver to the steering wheel 1 by the electric motor 8 to the steering shaft 2.

又、図示のステアリング装置は、衝突事故の際にステアリングホイール１が運転者側に突き上げられる事を防止する為に、中間シャフト４を、図８に示す様な、インナシャフト９とアウタチューブ１０とを組み合わせて成る伸縮軸としている。インナシャフト９の前端部外周面には、雄スプライン部１１が設けられている。又、アウタチューブ１０の内周面には、雌スプライン部１２が設けられている。そして、中間シャフト４は、インナシャフト９の雄スプライン部１１を、アウタチューブ１０の雌スプライン部１２に、トルク伝達を可能に、且つ、軸方向の相対変位を可能に係合させる事により、全長を伸縮可能に構成されている。又、図示の例の場合、インナシャフト９の後端部には、自在継手３ａを構成するヨーク１３ａが、アウタチューブ１０の前端部には、自在継手３ｂを構成するヨーク１３ｂが、それぞれ溶接等により結合固定されている。   Also, in order to prevent the steering wheel 1 from being pushed up to the driver's side in the event of a collision, the steering device shown in the drawing is provided with the inner shaft 9 and the outer tube 10 as shown in FIG. As the telescopic axis formed by combining A male spline portion 11 is provided on the outer peripheral surface of the front end portion of the inner shaft 9. In addition, on the inner peripheral surface of the outer tube 10, a female spline portion 12 is provided. The intermediate shaft 4 engages the male spline portion 11 of the inner shaft 9 with the female spline portion 12 of the outer tube 10 so as to enable torque transmission and allow relative displacement in the axial direction, thereby achieving a full length. Is configured to be extensible. In the case of the illustrated example, the yoke 13a constituting the universal joint 3a is welded to the rear end of the inner shaft 9, and the yoke 13b constituting the universal joint 3b is welded to the front end of the outer tube 10. It is fixed by bonding.

又、自在継手を構成するヨークと、中間シャフトを構成するインナシャフトとに関しては、これらを一体に成形してヨーク一体型シャフトとする事も、従来から知られている。この様なヨーク一体型シャフトの従来構造の１例に就いて、図１（Ｂ）及び図２（Ｂ）を参照しつつ説明する。尚、図１〜２に於いて、右側を軸方向片側とし、左側を軸方向他側とする。   With regard to a yoke constituting a universal joint and an inner shaft constituting an intermediate shaft, it is also conventionally known to integrally form these into a yoke-integrated shaft. One example of the conventional structure of such a yoke-integrated shaft will be described with reference to FIGS. 1 (B) and 2 (B). In FIGS. 1 and 2, the right side is one side in the axial direction, and the left side is the other side in the axial direction.

図１（Ｂ）及び図２（Ｂ）に記載したヨーク一体型シャフト１４の場合、インナシャフト９ａは、ヨーク１３ｃを構成する基部１５の軸方向他側面から軸方向他側に延出する状態で、ヨーク１３ｃと一体に、且つ、基部１５と同軸に設けられている。インナシャフト９ａのうち、基部１５との連結部である軸方向片端部の外周面には、軸方向片側に向かう程外径が大きくなる方向に傾斜した断面凹円弧状の傾斜曲面部１８が設けられており、傾斜曲面部１８に加わる応力を緩和できる様になっている。又、基部１５の外周面のうち、少なくとも軸方向他端部及び中間部には、軸方向他側に向かう程外径が小さくなる方向に傾斜した凸曲面部２１が設けられており、凸曲面部２１の軸方向他端縁と傾斜曲面部１８の軸方向片端縁とが滑らかに連続している。   In the case of the yoke integrated shaft 14 described in FIGS. 1 (B) and 2 (B), the inner shaft 9a extends from the other side surface in the axial direction of the base portion 15 constituting the yoke 13c to the other side in the axial direction , And coaxial with the base 15. Of the inner shaft 9a, on the outer peripheral surface of one end in the axial direction, which is a connecting portion with the base 15, an inclined curved surface 18 having a concave arc shape is provided. Therefore, it is possible to relieve the stress applied to the inclined curved surface portion 18. Further, of the outer peripheral surface of the base portion 15, at least the other axial end portion and the middle portion are provided with a convex curved surface portion 21 inclined in a direction in which the outer diameter becomes smaller toward the other side in the axial direction. The other axial end of the portion 21 and the one axial end of the inclined curved portion 18 are smoothly continuous.

上述の様なヨーク一体型シャフト１４を構成するインナシャフト９ａとアウタチューブ１０（図８参照）とは、トルク伝達を可能に且つ軸方向の相対変位を可能にスプライン係合させて中間シャフト４を構成する。このような中間シャフト４ａの場合、衝突事故の際の全長の収縮は、図１（Ｂ）に示す様に、アウタチューブ１０の軸方向片端縁が、傾斜曲面部１８に衝突するまで可能となる。この様な衝突が起こるまでの軸方向距離である収縮ストロークは、長くなる程、運転者の保護を充実させる事ができる。但し、ヨーク一体型シャフト１４の全長は、設置スペースとの関係で、所定の長さに決められる。従って、ヨーク一体型シャフト１４の全長を変える事なく、収縮ストロークを延長できる構造を実現する事が望まれる。   The inner shaft 9a and the outer tube 10 (see FIG. 8) constituting the yoke-integrated shaft 14 as described above are capable of transmitting torque and enabling relative displacement in the axial direction to spline-engage the intermediate shaft 4 Configure. In the case of such an intermediate shaft 4a, as shown in FIG. 1 (B), contraction of the entire length in the event of a collision accident becomes possible until one axial end edge of the outer tube 10 collides with the inclined curved surface portion 18 . The longer the contraction stroke, which is the axial distance until such a collision occurs, the better the protection of the driver can be. However, the total length of the yoke integrated shaft 14 is determined to be a predetermined length in relation to the installation space. Therefore, it is desirable to realize a structure that can extend the contraction stroke without changing the overall length of the yoke-integrated shaft 14.

上述の様な中間シャフト４ａの場合、ヨーク一体型シャフト１４の全長を変える事なく、収縮ストロークを延長する方法としては、例えば、ヨーク１３ｃの基部１５の肉厚を小さくして、その分、インナシャフト９ａの全長を長くする（傾斜曲面部１８の位置を軸方向片側にずらす）方法や、傾斜曲面部１８の断面の曲率半径Ｒを小さくして、その分、傾斜曲面部１８の軸方向寸法を小さくする（傾斜曲面部１８の軸方向他端縁の位置を軸方向片側にずらす）方法が考えられる。しかしながら、ヨーク１３ｃの基部１５の肉厚（特に１対の結合腕部１６、１６を連結する部分の肉厚Ｔ）や傾斜曲面部１８の断面の曲率半径Ｒは、強度確保の観点から、所定の大きさ以上にする必要がある為、無暗に小さくする事はできない。   In the case of the intermediate shaft 4a as described above, as a method of extending the contraction stroke without changing the overall length of the yoke integrated shaft 14, for example, the thickness of the base 15 of the yoke 13c is reduced, and A method of increasing the total length of the shaft 9a (shifting the position of the inclined curved surface portion 18 to one side in the axial direction) or reducing the radius of curvature R of the cross section of the inclined curved surface 18 A method is conceivable in which the position of the other axial end of the inclined curved surface portion 18 is shifted to one side in the axial direction). However, the thickness of the base portion 15 of the yoke 13c (in particular, the thickness T of the portion connecting the pair of coupling arms 16, 16) and the curvature radius R of the cross section of the inclined curved surface portion 18 are predetermined from the viewpoint of securing strength. Because it is necessary to make it larger than the size, it can not be made small and silent.

日本国特開２０１５−２１５９６号公報Japanese Patent Application Laid-Open No. 2015-2515

本発明は、上述の様な事情に鑑み、伸縮軸の収縮ストロークの確保とヨーク一体型シャフトの強度確保とを両立し易い構造を実現すべく発明したものである。   SUMMARY OF THE INVENTION In view of the above-described circumstances, the present invention has been invented in order to realize a structure in which it is easy to achieve both the securing of the contraction stroke of the telescopic shaft and the securing of the strength of the yoke-integrated shaft.

本発明のヨーク一体型シャフトは、自在継手用のヨークと、インナシャフトとを備える。
前記ヨークは、基部と、前記基部の径方向反対側となる２箇所位置から軸方向片側に延出する１対の結合腕部とを備える。
又、前記インナシャフトは、前記基部の軸方向他側面の径方向中央部から軸方向他側に延出し、前記ヨークと一体に設けられている。
又、前記インナシャフトの軸方向片端部の外周面に、軸方向片側に向かう程外径が大きくなるように傾斜した断面凹曲面状の傾斜曲面部が設けられている。
又、前記基部の外周面のうち、少なくとも軸方向他端部及び中間部には、軸方向他側に向かう程外形が小さくなる方向に傾斜した凸曲面部が設けられる。
又、前記ヨークの基部のうち、前記１対の結合腕部を連結する部分の肉厚は、前記結合腕部の肉厚よりも厚い。
又、前記傾斜曲面部の軸方向片端縁と前記凸曲面部の軸方向他端縁とが、前記基部の軸方向他側面に設けられた、平坦面部を介して連続している。即ち、前記傾斜曲面部の軸方向片端縁と前記平坦面部の径方向内端縁とが連続しており、且つ、前記凸曲面部の軸方向他端縁と前記平坦面部の径方向外端縁とが連続している。 The yoke-integrated shaft of the present invention comprises a yoke for a universal joint and an inner shaft.
The yoke includes a base, and a pair of coupling arms extending axially to one side from two positions on radially opposite sides of the base.
Further, the inner shaft extends from the radial center portion of the other side surface in the axial direction of the base portion to the other side in the axial direction and is provided integrally with the yoke.
Further, on the outer peripheral surface of one axial end portion of the inner shaft, there is provided an inclined curved surface having a concave surface with a concaved cross section which is inclined such that the outer diameter becomes larger toward one axial direction.
Further, of the outer peripheral surface of the base portion, at least the other axial end portion and the middle portion are provided with a convex curved surface portion which is inclined in a direction in which the outer shape becomes smaller toward the other axial direction.
Further, the thickness of the portion connecting the pair of connecting arms in the base of the yoke is thicker than the thickness of the connecting arms.
Further, one axial end edge of the inclined curved surface portion and the other axial end edge of the convex curved surface portion are continuous via a flat surface portion provided on the other axial side surface of the base portion. That is, one axial end edge of the inclined curved surface portion is continuous with the radial inner end edge of the flat surface portion, and the other axial end edge of the convex curved surface portion and the radial outer end edge of the flat surface portion And are continuous.

本発明のヨーク一体型シャフトを実施する場合には、例えば、前記インナシャフトの中心軸に対する、前記傾斜曲面部の軸方向片端縁の接線の傾斜角度を９０゜未満にする事ができる。換言すれば、前記傾斜曲面部の軸方向片端縁と前記平坦面部の径方向内端縁との連続部を、（断面形状に関して）微分不可能な隅部とする事ができる。
尚、本発明を実施する場合、前記傾斜曲面部の軸方向片端縁と前記平坦面部の径方向内端縁との連続部を、断面の曲率半径が前記傾斜曲面部の断面の曲率半径よりも小さい隅Ｒ部とする事もできる。When the yoke integrated shaft of the present invention is implemented, for example, the inclination angle of the tangent of the axial one end edge of the inclined curved surface portion with respect to the central axis of the inner shaft can be less than 90 °. In other words, the continuous portion between the axial one end edge of the inclined curved surface portion and the radial inner end edge of the flat surface portion can be a non-differentiable corner portion (with respect to the cross-sectional shape).
When the present invention is carried out, the continuous portion between the axial one end edge of the inclined curved surface portion and the radial inner end edge of the flat surface portion has a radius of curvature of the cross section more than the radius of curvature of the cross section of the inclined curved surface portion. It can also be a small corner radius.

さらに、本発明のヨーク一体型シャフトを実施する場合には、傾斜曲面部は、軸方向片側に向かう程外径が大きくなるように傾斜した断面凹円弧状であることが好ましい。
また、本発明のヨーク一体型シャフトを実施する場合には、平坦面部は、基部の軸方向に直交することが好ましい。 Et al is, when implementing the yoke-integral shaft of the present invention, the inclined curved portion is preferably the outer diameter increases toward axial one side is inclined sectional concave arcuate so as to increase.
Further, in the case of implementing the yoke-integrated shaft of the present invention, the flat surface portion is preferably orthogonal to the axial direction of the base.

本発明の伸縮軸は、上述したヨーク一体型シャフトと、アウタチューブとを備える。
前記アウタチューブは、前記ヨーク一体型シャフトを構成する前記インナシャフトに対して、トルク伝達可能に且つ軸方向の相対変位可能に外嵌されている。
この様な本発明の伸縮軸のより具体的な構成として、例えば、前記インナシャフトの外周面のうち、軸方向に関して前記傾斜曲面部から外れた部分に設けられた雄スプライン部と、前記アウタチューブの内周面に設けられた雌スプライン部とを係合させる構成や、前記インナシャフトの外周面のうち、軸方向に関して前記傾斜曲面部から外れた部分に、円周方向に離隔してそれぞれ軸方向に形成された複数の内側凹溝と、前記アウタチューブの内周面のうち前記各内側凹溝と整合する箇所にそれぞれ軸方向に形成された複数の外側凹溝との間に、それぞれ複数個ずつの玉を軸方向に並べて配置した構成を採用する事ができる。The telescopic shaft of the present invention includes the above-described yoke-integrated shaft and an outer tube.
The outer tube is externally fitted to the inner shaft constituting the yoke-integrated shaft so as to transmit torque and allow relative displacement in the axial direction.
As a more specific configuration of such an extension shaft according to the present invention, for example, a male spline portion provided in a portion out of the inclined curved surface portion in the axial direction of the outer peripheral surface of the inner shaft, and the outer tube Of the outer peripheral surface of the inner shaft, in a portion separated from the inclined curved surface portion in the axial direction, in an outer circumferential surface of the inner shaft. Between the plurality of inner grooves formed in the direction and the plurality of outer grooves formed in the axial direction at positions matching the inner grooves on the inner circumferential surface of the outer tube, respectively It is possible to adopt a configuration in which individual balls are arranged in the axial direction.

また、上述した伸縮軸を実施する場合には、例えば、アウタチューブの軸方向片端部の内周面は、アウタチューブの軸方向片端縁が平坦面部に接触する位置まで、全長を収縮可能になるように、テーパ状に形成されてもよい。
また、上述した伸縮軸を実施する場合には、例えば、アウタチューブの軸方向片端部の内周面は、アウタチューブの軸方向片端縁が平坦面部に接触する位置まで、全長を収縮可能になるように、アウタチューブの雌スプライン部より大径の円筒状に形成されてもよい。When the above-mentioned telescopic shaft is to be implemented, for example, the inner peripheral surface of one axial end of the outer tube can be contracted over its entire length to a position where one axial end of the outer tube contacts the flat surface. Thus, it may be tapered.
When the above-mentioned telescopic shaft is to be implemented, for example, the inner peripheral surface of one axial end of the outer tube can be contracted over its entire length to a position where one axial end of the outer tube contacts the flat surface. Thus, it may be formed in a cylindrical shape having a larger diameter than the female spline portion of the outer tube.

上述の様な構成を有する本発明のヨーク一体型シャフト及び伸縮軸によれば、伸縮軸の収縮ストロークの確保とヨーク一体型シャフトの強度確保とを両立し易くできる。
即ち、本発明の場合には、前記基部の外周面のうち、少なくとも軸方向他端部及び中間部には、軸方向他側に向かう程外形が小さくなる方向に傾斜した凸曲面部が設けられ、インナシャフトの軸方向片端部の外周面に設けられた傾斜曲面部の軸方向片端縁と、ヨークの基部の凸曲面部の軸方向他端縁とが、前記基部の軸方向他側面に設けられた、平坦面部を介して連続している。この為、本発明の場合には、前記傾斜曲面部の軸方向片端縁と前記基部の外周面の軸方向他端縁とが直接（前記平坦面部を介する事なく）連続している構造との比較に於いて、例えば、前記傾斜曲面部の断面の曲率半径を同じ大きさにする場合に、伸縮軸の収縮ストロークを確保しつつ、前記基部のうち１対の結合腕部を連結する部分の肉厚を確保する事が容易となる。この様に、本発明の場合には、伸縮軸の収縮ストロークの確保とヨーク一体型シャフトの強度確保とを両立し易くできる。
また、ヨークの基部のうち、前記１対の結合腕部を連結する部分の肉厚は、前記結合腕部の肉厚よりも厚く形成されているので、結合腕部の根元部に高い応力が発生するのを抑制することができる。 According to the yoke-integrated shaft and the telescopic shaft of the present invention having the above-mentioned configuration, it is possible to easily achieve both ensuring of the contraction stroke of the telescopic shaft and securing of the strength of the yoke-integrated shaft.
That is, in the case of the present invention , at least the other axial end portion and the middle portion of the outer peripheral surface of the base portion are provided with convex curved portions inclined in such a direction that the outer shape becomes smaller toward the other axial side. an axial one end edge of the inclined curved portion provided on the outer peripheral surface of the axial one end portion of the inner shaft, and the other axial end edge of the convex curved portion of the base portion of the yoke, provided the other axial side of said base It is continuous through the flat surface. For this reason, in the case of the present invention, the axial one end edge of the inclined curved surface portion and the other axial end edge of the outer peripheral surface of the base are directly connected (without the flat surface portion). In comparison, for example, in the case where the radius of curvature of the cross section of the inclined curved surface portion is made to have the same size, a portion connecting the pair of coupling arms of the base while securing the contraction stroke of the expansion and contraction axis It becomes easy to secure the thickness. As described above, in the case of the present invention, it is possible to easily achieve both the securing of the contraction stroke of the expansion shaft and the securing of the strength of the yoke-integrated shaft.
Further, in the base of the yoke, the thickness of the portion connecting the pair of connecting arms is formed thicker than the thickness of the connecting arms, so high stress is generated at the root of the connecting arms. It can be suppressed to occur.

本発明の一実施形態の中間シャフト（Ａ）と、比較例の中間シャフト（Ｂ）とを、それぞれ全長を最も短くした状態で、且つ、一部を切断した状態で示す端部側面図。The edge part side view which shows the intermediate shaft (A) of one Embodiment of this invention, and the intermediate shaft (B) of a comparative example in the state which shortened the full length, respectively, and in the state which cut | disconnected one part. 本発明の一実施形態のヨーク一体型シャフト（Ａ）と、比較例のヨーク一体型中間シャフト（Ｂ）とを示す、端部側面図。The end side view showing yoke integrated shaft (A) of one embodiment of the present invention, and yoke integrated middle shaft (B) of a comparative example. 図２（Ａ）の左上部分の拡大図。The enlarged view of the upper left part of FIG. 2 (A). （Ａ）及び（Ｂ）は、図２（Ａ）のＩＶ−ＩＶ断面図。(A) and (B) are IV-IV sectional drawings of FIG. 2 (A). アウタチューブの軸方向片端部の形状が異なる、第１変形例の中間シャフトを、全長を最も短くした状態で、且つ、一部を切断した状態で示す端部側面図。The end part side view which shows the intermediate shaft of the 1st modification from which the shape of the axial direction one end part of an outer tube differs, in the state which shortened the whole length, and in the state which cut | disconnected one part. アウタチューブの軸方向片端部の形状が異なる、第２変形例の中間シャフトを、全長を最も短くした状態で、且つ、一部を切断した状態で示す端部側面図。The end part side view which shows the intermediate shaft of the 2nd modification from which the shape of the axial direction one end part of an outer tube differs, in the state which shortened the whole length, and in the state which cut | disconnected one part. 従来から知られているステアリング装置の１例を示す部分切断側面図。FIG. 10 is a partial cutaway side view showing an example of a steering device conventionally known. 中間シャフト及び１対の自在継手を取り出して示す部分切断側面図。The partial cut side view which takes out and shows an intermediate shaft and a pair of universal joints.

本発明の一実施形態に就いて、図１〜４を参照しつつ説明する。
尚、図１〜２に関して、（Ａ）は本実施形態の構造を、（Ｂ）は比較例である従来構造を、それぞれ示している。又、図１、２、４に於いて、右側を軸方向片側とし、左側を軸方向他側とする。One embodiment of the present invention will be described with reference to FIGS.
As for FIGS. 1 and 2, (A) shows the structure of the present embodiment and (B) shows the conventional structure which is a comparative example. In FIGS. 1, 2 and 4, the right side is one side in the axial direction, and the left side is the other side in the axial direction.

本発明の伸縮軸に相当する、本実施形態の中間シャフト４ｂは、鋼製のヨーク一体型シャフト１４ａと、鋼製のアウタチューブ１０とを備える。   The intermediate shaft 4b of the present embodiment, which corresponds to the telescopic shaft of the present invention, includes a steel yoke integrated shaft 14a and a steel outer tube 10.

ヨーク一体型シャフト１４ａは、自在継手用のヨーク１３ｄと、インナシャフト９ｂとを備える。   The yoke-integrated shaft 14a includes a yoke 13d for a universal joint and an inner shaft 9b.

ヨーク１３ｄは、基部１５ａと、基部１５ａの径方向反対側となる２箇所位置（図１〜２に於ける上下２箇所位置）から軸方向片側（図１〜２に於ける右側）に延出する状態で設けられた１対の結合腕部１６、１６とを備える。本実施形態の場合、基部１５の外周面のうち、少なくとも軸方向他端部及び中間部には、軸方向他側に向かう程外径が小さくなる方向に傾斜した凸曲面部２１が設けられている。又、基部１５の軸方向内側面の径方向外端部には、基部１５の軸方向に直交する平坦面部２０が全周に亙り設けられている。そして、平坦面部２０の径方向外端縁と凸曲面部２１の軸方向他端縁とが連続している。又、両結合腕部１６、１６の先端部には、それぞれ円孔１７、１７が、互いに同軸となる様に設けられている。ヨーク１３ｄを含んで構成される自在継手３ａ（図７〜８参照）を組み立てた状態で、円孔１７、１７内には、それぞれ有底円筒状の軸受カップが内嵌固定される。これと共に、両軸受カップ内に、それぞれ複数本のニードルを介して、十字軸の端部が回動自在に支持される。   The yoke 13d extends from the base 15a and two positions on the radial opposite side of the base 15a (upper and lower two positions in FIGS. 1 and 2) to one side in the axial direction (right side in FIGS. 1 and 2) And a pair of coupling arms 16, 16 provided in a state of In the case of the present embodiment, at least the other axial end portion and the middle portion of the outer peripheral surface of the base portion 15 are provided with the convex curved surface portion 21 inclined in a direction in which the outer diameter decreases toward the other axial direction There is. Further, a flat surface portion 20 orthogonal to the axial direction of the base 15 is provided around the entire circumference at the radial outer end of the axial inner surface of the base 15. Then, the radial outer end edge of the flat surface portion 20 and the other axial end edge of the convex curved surface portion 21 are continuous. Further, circular holes 17, 17 are provided coaxially at the tip end portions of both the connecting arm portions 16, 16, respectively. With the universal joint 3a (see FIGS. 7 to 8) configured to include the yoke 13d, a cylindrical bearing cup with a bottom is fixedly fitted in the circular holes 17 and 17, respectively. At the same time, the end of the cross shaft is rotatably supported in the both bearing cups via a plurality of needles.

インナシャフト９ｂは、基部１５ａの軸方向他側面の径方向中央部から軸方向他側に延出する状態で、ヨーク１３ｄと一体に、且つ、基部１５ａと同軸に設けられている。インナシャフト９ｂの外周面のうち、軸方向他端部（図１〜２に図示されない端部）には、雄スプライン部１１（図８参照）が設けられており、軸方向片端部には、軸方向片側に向かう程外径が大きくなるように傾斜した、断面凹円弧状の傾斜曲面部１８ａが設けられており、軸方向中間部（雄スプライン部１１と傾斜曲面部１８ａとの間に挟まれた部分）には、軸方向に関して外径が変化しない円筒面部１９が設けられている。円筒面部１９の外径は、雄スプライン部１１の溝底円の直径とほぼ等しくなっている。   The inner shaft 9b is provided integrally with the yoke 13d and coaxial with the base 15a in a state where the inner shaft 9b extends to the other side in the axial direction from the radial center of the other side surface in the axial direction of the base 15a. Of the outer peripheral surface of the inner shaft 9b, a male spline portion 11 (see FIG. 8) is provided at the other axial end (the end not shown in FIGS. 1 and 2). An inclined curved surface portion 18a having a concaved cross-section and inclined such that the outer diameter increases toward one axial direction is provided, and the axially intermediate portion (between the male spline portion 11 and the inclined curved surface portion 18a is sandwiched) The cylindrical surface portion 19 whose outer diameter does not change in the axial direction is provided on the The outer diameter of the cylindrical surface portion 19 is substantially equal to the diameter of the groove bottom circle of the male spline portion 11.

又、インナシャフト９ｂの中心軸に対する、傾斜曲面部１８ａの軸方向他端縁（始点）の接線の傾斜角度は、０゜になっている。換言すれば、傾斜曲面部１８ａの軸方向他端縁は、円筒面部１９の軸方向片端縁と滑らかに連続している。又、傾斜曲面部１８ａの軸方向片端縁は、平坦面部２０の径方向内端縁と連続している。即ち、傾斜曲面部１８ａの軸方向片端縁と凸曲面部２１の軸方向他端縁とは、平坦面部２０を介して連続している。又、本実施形態の場合、インナシャフト９ｂの中心軸に対する傾斜曲面部１８ａの軸方向片端縁の接線の傾斜角度θは、９０゜未満（０゜＜θ＜９０゜）になっている｛図示の例では、４０゜〜６０゜（４０゜≦θ≦６０゜）程度になっている｝。換言すれば、傾斜曲面部１８ａの軸方向片端縁と平坦面部２０の径方向内端縁との連続部は（断面形状に関して）微分不可能な隅部になっている。   The inclination angle of the tangent of the other axial end (start point) of the inclined curved surface portion 18a with respect to the central axis of the inner shaft 9b is 0 °. In other words, the other axial end of the inclined curved surface portion 18 a is smoothly continuous with the one axial end of the cylindrical surface portion 19. Further, the axial one end edge of the inclined curved surface portion 18 a is continuous with the radial inner end edge of the flat surface portion 20. That is, the axial direction one end edge of the inclined curved surface portion 18 a and the axial direction other end edge of the convex curved surface portion 21 are continuous via the flat surface portion 20. Further, in the case of this embodiment, the inclination angle θ of the tangent of one axial end of the inclined curved surface portion 18a with respect to the central axis of the inner shaft 9b is less than 90 ° (0 ° <θ <90 °) {shown In the example of, it is about 40 ° to 60 ° (40 ° ≦ θ ≦ 60 °)}. In other words, the continuous portion between the axial one end edge of the inclined curved surface portion 18 a and the radial inner end edge of the flat surface portion 20 is a non-differentiable corner portion (with respect to the cross-sectional shape).

又、本実施形態の場合、軸方向から見た平坦面部２０の外周縁の形状は、図４（Ａ）に示す様な円形（傾斜曲面部１８ａと同軸の円形）である。但し、本発明を実施する場合、軸方向から見た平坦面部２０の外周縁の形状は、例えば図４（Ｂ）に示す様な矩形等の、他の形状とする事もできる。   Further, in the case of the present embodiment, the shape of the outer peripheral edge of the flat surface portion 20 viewed from the axial direction is a circle (circle coaxial with the inclined curved surface portion 18a) as shown in FIG. 4A. However, when implementing this invention, the shape of the outer periphery of the flat surface part 20 seen from the axial direction can also be made into other shapes, such as a rectangle as shown, for example to FIG. 4 (B).

このように、ヨーク１３ｄの基部１５ａの軸方向他側面に形成された平坦面部２０は、寸法測定のための基準面として利用することができる。また、平坦面部２０は、ヨーク一体型シャフト１４ａの他の部分を加工する際の加工基準として利用することができ、加工性を向上できる。   As described above, the flat surface portion 20 formed on the other side surface in the axial direction of the base portion 15a of the yoke 13d can be used as a reference surface for dimension measurement. In addition, the flat surface portion 20 can be used as a processing reference when processing the other portion of the yoke integrated shaft 14a, and the processability can be improved.

アウタチューブ１０は、円管状に造られたもので、内周面に雌スプライン部１２が設けられている。   The outer tube 10 is formed into a circular tubular shape, and a female spline portion 12 is provided on the inner peripheral surface.

そして、本実施形態の中間シャフト４ｂは、前述の図８に示した従来から知られている中間シャフト４の場合と同様、インナシャフト９ｂの雄スプライン部１１を、アウタチューブ１０の雌スプライン部１２に、トルク伝達を可能に、且つ、軸方向の相対変位を可能に係合させる事により、全長を伸縮可能に構成されている。この様な本実施形態の中間シャフト４ｂの場合も、自動車のステアリング装置に組み込まれた状態で、衝突事故の際の全長の収縮は、図１（Ａ）に示す様に、アウタチューブ１０の軸方向片端縁が、傾斜曲面部１８ａに衝突するまで可能となる。   The intermediate shaft 4b of this embodiment is the same as the conventional intermediate shaft 4 shown in FIG. 8 described above, the male spline portion 11 of the inner shaft 9b and the female spline portion 12 of the outer tube 10 The entire length can be expanded and contracted by enabling torque transmission and engaging an axial relative displacement. Also in the case of the intermediate shaft 4b of the present embodiment as described above, the contraction of the entire length in the event of a collision accident is the axis of the outer tube 10 as shown in FIG. It is possible until one direction edge collides with the inclined curved surface portion 18a.

上述の様な構成を有する本実施形態のヨーク一体型シャフト１４ａ及び中間シャフト４ｂによれば、中間シャフト４ｂの収縮ストロークの確保と、ヨーク一体型シャフト１４ａの強度確保とを、両立し易くできる。
この点に就いて、本実施形態の構造と、図１（Ｂ）及び図２（Ｂ）に示す様な（更には、図３に二点鎖線で示す様な）比較例の構造とを、互いに比較しながら説明する。According to the yoke-integrated shaft 14a and the intermediate shaft 4b of the present embodiment having the above-described configuration, it is possible to easily achieve both ensuring of the contraction stroke of the intermediate shaft 4b and securing of the strength of the yoke-integrated shaft 14a.
Regarding this point, the structure of the present embodiment and the structure of the comparative example as shown in FIG. 1 (B) and FIG. 2 (B) (further, as shown by a two-dot chain line in FIG. 3) It explains, comparing each other.

比較例の構造は、平坦面部２０を備えておらず、傾斜曲面部１８の軸方向片端縁と凸曲面部２１の軸方向他端縁とを滑らかに連続させている点が、本実施形態の構造と異なる。この様な比較例の構造の場合、ヨーク一体型シャフト１４の全長を変える事なく、中間シャフト４ａの収縮ストロークをδだけ増やす為に、図２（Ｂ）に二点鎖線で示す様に、傾斜曲面部１８を軸方向片側にδだけ平行移動させると、凸曲面部２１も軸方向片側にδだけ平行移動する事になる。従って、比較例の構造の場合には、この様な平行移動の前後で、傾斜曲面部１８の断面の曲率半径Ｒは変化しないが、ヨーク１３ｃの基部１５のうち１対の結合腕部１６、１６を連結する部分の肉厚がＴからＴS（Ｔ＞ＴS）に減少してしまう。In the structure of the comparative example, the flat surface portion 20 is not provided, and the axial end edge of the inclined curved surface portion 18 and the other axial end edge of the convex curved surface portion 21 are smoothly continued in this embodiment. Different from the structure. In the case of the structure of such a comparative example, in order to increase the contraction stroke of the intermediate shaft 4a by δ without changing the overall length of the yoke-integrated shaft 14, as shown by a two-dot chain line in FIG. When the curved surface portion 18 is moved in parallel in one axial direction by δ, the convex curved surface portion 21 is also moved in parallel in the axial direction by δ. Therefore, in the case of the structure of the comparative example, the radius of curvature R of the cross section of the inclined curved surface portion 18 does not change before and after such parallel movement, but one pair of coupling arms 16 of the base 15 of the yoke 13 c The thickness of the portion connecting 16 decreases from T to T S (T> T S ).

これに対して、本実施形態の構造の場合には、傾斜曲面部１８ａの軸方向片端縁と凸曲面部２１の軸方向他端縁とを、平坦面部２０を介して連続させている。この様な本実施形態の構造の場合には、ヨーク一体型シャフト１４ａの全長を変える事なく、中間シャフト４ｂの収縮ストロークをδだけ増やす為に（図１参照）、図２（Ａ）に示す様に、傾斜曲面部１８ａを、図２（Ｂ）に示した比較例の構造の傾斜曲面部１８の位置を基準として、軸方向片側にδだけ平行移動させる場合でも、凸曲面部２１は、軸方向片側に平行移動させる必要がなく、元の位置に留めておく事ができる。従って、本実施形態の構造の場合には、この様な平行移動の前後で、傾斜曲面部１８ａの断面の曲率半径Ｒだけでなく、ヨーク１３ｄの基部１５ａのうち１対の結合腕部１６、１６を連結する部分の肉厚Ｔも、変化させずに済む。即ち、ヨーク１３ｃの基部１５のうち１対の結合腕部１６、１６を連結する部分（凸曲面部２１と基部１５ａの内面との間の部分）の肉厚Ｔは、結合腕部１６、１６の肉厚Ｓよりも厚いまま維持され（Ｔ＞Ｓ）、結合腕部１６、１６の根元部に高い応力が発生するのを抑制できる。   On the other hand, in the case of the structure of the present embodiment, one axial end edge of the inclined curved surface portion 18 a and the other axial end edge of the convex curved surface portion 21 are continuous through the flat surface portion 20. In the case of the structure of this embodiment, the contraction stroke of the intermediate shaft 4b is increased by δ without changing the overall length of the yoke integrated shaft 14a (see FIG. 1), as shown in FIG. Similarly, even when the inclined curved surface portion 18a is moved in parallel in the axial direction by δ on the basis of the position of the inclined curved surface portion 18 of the structure of the comparative example shown in FIG. There is no need to translate one side in the axial direction, and the original position can be maintained. Therefore, in the case of the structure of this embodiment, before and after such parallel movement, not only the curvature radius R of the cross section of the inclined curved surface portion 18a, but also the pair of coupling arms 16 of the base 15a of the yoke 13d, The thickness T of the portion connecting 16 also does not change. That is, the thickness T of a portion (a portion between the convex curved surface portion 21 and the inner surface of the base portion 15a) of the base portion 15 of the yoke 13c that connects the pair of coupling arm portions 16 and 16 Can be maintained as being thicker than the thickness S (T> S), and generation of high stress at the root portions of the connecting arms 16 and 16 can be suppressed.

更に、図３に示す様に、本実施形態の構造（実線）と、比較例の構造（二点鎖線）とで、傾斜曲面部１８ａ、１８の断面の曲率半径Ｒ、傾斜曲面部１８ａ、１８の軸方向両端縁の軸方向位置、ヨーク１３ｄ、１３ｃの基部１５ａ、１５のうち１対の結合腕部１６、１６を連結する部分の肉厚Ｔを、それぞれ互いに等しくする場合でも、本実施形態の構造の場合には、比較例の構造の場合よりも、アウタチューブ１０（図１参照）の軸方向片端縁が傾斜曲面部１８ａ、１８に衝突する位置（本実施形態はα、比較例はβ）が、軸方向片側に寄った位置となる。従って、この場合も、本実施形態の構造の方が、比較例の構造よりも、中間シャフトの収縮ストロークを大きくする事ができる。   Furthermore, as shown in FIG. 3, the curvature radius R of the cross section of the inclined curved surface portions 18a and 18 and the inclined curved surface portions 18a and 18 according to the structure (solid line) of the present embodiment and the structure (two-dot chain line) of the comparative example. Even when the axial positions of the axially opposite end edges and the thickness T of the portions connecting the pair of coupling arms 16 of the bases 15a and 15 of the yokes 13d and 13c are equal to each other, the present embodiment In the case of the structure of this embodiment, the axial end of the outer tube 10 (see FIG. 1) collides with the inclined curved surface portions 18a and 18 (in this embodiment, α, the comparative example) than in the structure of the comparative example. (beta) becomes the position which turned to one axial direction. Therefore, also in this case, the contraction stroke of the intermediate shaft can be made larger in the structure of the present embodiment than in the structure of the comparative example.

以上の様に、本実施形態の場合には、ヨーク一体型シャフト１４ａの強度に関して重要な寸法である、傾斜曲面部１８ａの断面の曲率半径Ｒ、基部１５ａのうち両結合腕部１６、１６を連結する部分の肉厚Ｔ、及び円筒面部１９の外径φを、それぞれ比較例の構造と同じ大きさにしつつ、中間シャフト４ｂの伸縮ストロークを、比較例の構造よりも大きくできる。従って、本実施形態の構造の場合には、中間シャフト４ｂの収縮ストロークの確保と、ヨーク一体型シャフト１４ａの強度確保とを、両立し易くできる。   As described above, in the case of the present embodiment, the radius of curvature R of the cross section of the inclined curved surface portion 18a, which is an important dimension with respect to the strength of the yoke integrated shaft 14a, The expansion stroke of the intermediate shaft 4b can be made larger than the structure of the comparative example while making the thickness T of the connecting part and the outer diameter φ of the cylindrical surface 19 the same size as the structure of the comparative example. Therefore, in the case of the structure of the present embodiment, it is possible to easily achieve both the securing of the contraction stroke of the intermediate shaft 4b and the securing of the strength of the yoke-integrated shaft 14a.

なお、本発明は、上述した実施形態に限定されるものでなく、適宜、変形、改良等が可能である。   The present invention is not limited to the embodiment described above, and appropriate modifications, improvements, etc. are possible.

図５及び図６は、上記実施形態とアウタチューブの軸方向片端部の形状が異なる、第１及び第２変形例の中間シャフト４ｂを示す。
図５に示す第１変形例では、アウタチューブ１０ａの軸方向片端部の内周面は、テーパ状に形成されるテーパ面３０を有する。テーパ面３０の軸方向片端縁の内周面の径は、傾斜曲面部１８ａの軸方向片端縁の径よりも大きい。また、テーパ面３０は、中間シャフト４ｂの全長を最も短くした際、傾斜曲面部１８ａと接触せず、アウタチューブ１０ａの軸方向片端縁が、ヨーク１３ｄの平坦面部２０に接触するように形成される。FIG.5 and FIG.6 shows the intermediate shaft 4b of the said 1st and 2nd modification from which the shape of the axial direction end part of an outer tube and the said embodiment differs.
In the first modified example shown in FIG. 5, the inner peripheral surface of one axial end of the outer tube 10a has a tapered surface 30 formed in a tapered shape. The diameter of the inner circumferential surface of one axial end of the tapered surface 30 is larger than the diameter of the axial one end of the inclined curved surface portion 18a. The tapered surface 30 does not contact the inclined curved surface portion 18a when the entire length of the intermediate shaft 4b is shortest, and the axial end of the outer tube 10a contacts the flat surface portion 20 of the yoke 13d. Ru.

したがって、アウタチューブ１０ａの軸方向片端部の内周面に形成されたテーパ面３０により、アウタチューブ１０ａの軸方向片端縁がヨーク１３ｄの平坦面部２０に接触する位置まで、中間シャフト４ｂの全長を収縮可能となる。したがって、第１変形例では、中間シャフト４ｂの収縮ストロークを、上記実施形態よりもさらに長くすることができる。   Therefore, by the tapered surface 30 formed on the inner peripheral surface of one axial end of the outer tube 10a, the entire length of the intermediate shaft 4b is increased to a position where the axial one end of the outer tube 10a contacts the flat surface 20 of the yoke 13d. It can contract. Therefore, in the first modification, the contraction stroke of the intermediate shaft 4b can be made longer than in the above embodiment.

図６に示す第２変形例では、アウタチューブ１０ａの軸方向片端部の内周面は、アウタチューブ１０ｂの雌スプライン部１２より大径、且つ、傾斜曲面部１８ａの軸方向片端縁の径より大径の円筒状に形成される円筒部３１を有する。また、円筒部３１は、中間シャフト４ｂの全長を最も短くした際、傾斜曲面部１８ａと接触せず、アウタチューブ１０ａの軸方向片端縁が、ヨーク１３ｄの平坦面部２０に接触するように形成される。   In the second modification shown in FIG. 6, the inner peripheral surface of one axial end of the outer tube 10a is larger in diameter than the female spline 12 of the outer tube 10b, and the diameter of the axial one end of the inclined curved surface 18a. It has a cylindrical portion 31 formed in a large diameter cylindrical shape. The cylindrical portion 31 is not in contact with the inclined curved surface portion 18a when the entire length of the intermediate shaft 4b is shortest, and the axial end of the outer tube 10a is formed in contact with the flat surface portion 20 of the yoke 13d. Ru.

したがって、アウタチューブ１０ａの軸方向片端部の内周面に形成された円筒面３１により、アウタチューブ１０ａの軸方向片端縁がヨーク１３ｄの平坦面部２０に接触する位置まで、中間シャフト４ｂの全長を収縮可能となる。したがって、第２変形例でも、中間シャフト４ｂの収縮ストロークを、上記実施形態よりもさらに長くすることができる。   Therefore, by the cylindrical surface 31 formed on the inner peripheral surface of one axial end of the outer tube 10a, the entire length of the intermediate shaft 4b is increased to a position where the axial one end edge of the outer tube 10a contacts the flat surface 20 of the yoke 13d. It can contract. Therefore, also in the second modified example, the contraction stroke of the intermediate shaft 4b can be made longer than the above embodiment.

また、本発明の平坦面部は、本実施形態のように、基部１５の軸方向に直交することが好ましいが、これに限らず、本発明の効果を達成するものであれば、例えば、基部１５の軸方向に対して傾斜していてもよい。   Moreover, although it is preferable that the flat surface part of this invention is orthogonal to the axial direction of the base 15 like this embodiment, if it achieves the effect of not only this but this invention, for example, the base 15 It may be inclined with respect to the axial direction of.

本発明の伸縮軸は、ステアリング装置の中間シャフト４ｂ以外の伸縮軸にも適用可能である。   The telescopic shaft of the present invention is also applicable to telescopic shafts other than the intermediate shaft 4b of the steering device.

本出願は、２０１５年８月２０日出願の日本特許出願２０１５−１６３０４５に基づくものであり、その内容はここに参照として取り込まれる。   This application is based on Japanese Patent Application No. 2015-163045 filed on Aug. 20, 2015, the contents of which are incorporated herein by reference.

１ ステアリングホイール
２ ステアリングシャフト
３ａ、３ｂ 自在継手
４、４ａ、４ｂ 中間シャフト
５ ステアリングギヤユニット
６ 入力軸
７ タイロッド
８ 電動モータ
９、９ａ、９ｂ インナシャフト
１０、１０ａ、１０ｂ アウタチューブ
１１ 雄スプライン部
１２ 雌スプライン部
１３ａ、１３ｂ、１３ｃ、１３ｄ ヨーク
１４、１４ａ ヨーク一体型シャフト
１５、１５ａ 基部
１６ 結合腕部
１７ 円孔
１８、１８ａ 傾斜曲面部
１９ 円筒面部
２０ 平坦面部
２１ 凸曲面部1 steering wheel 2 steering shaft 3a, 3b universal joint 4, 4a, 4b intermediate shaft 5 steering gear unit 6 input shaft 7 tie rod 8 electric motor 9, 9a, 9b inner shaft 10, 10a, 10b outer tube 11 male spline portion 12 female Spline portion 13a, 13b, 13c, 13d Yoke 14, 14a Yoke integrated shaft 15, 15a base 16 joint arm portion 17 circular hole 18, 18a inclined curved surface portion 19 cylindrical surface portion 20 flat surface portion 21 convex curved surface portion

Claims (7)

基部と、前記基部の径方向反対側となる２箇所位置から軸方向片側に延出する１対の結合腕部とを備えた自在継手用のヨークと、
前記基部の軸方向他側面の径方向中央部から軸方向他側に延出し、前記ヨークと一体に設けられたインナシャフトとを備え、
前記インナシャフトの軸方向片端部の外周面に、軸方向片側に向かう程外径が大きくなるように傾斜した断面凹曲面状の傾斜曲面部が設けられており、
前記基部の外周面のうち、少なくとも軸方向他端部及び中間部には、軸方向他側に向かう程外形が小さくなる方向に傾斜した凸曲面部が設けられ、
前記ヨークの基部のうち、前記１対の結合腕部を連結する部分の肉厚は、前記結合腕部の肉厚よりも厚く、
前記傾斜曲面部の軸方向片端縁と前記凸曲面部の軸方向他端縁とが、前記基部の軸方向他側面に設けられた、平坦面部を介して連続している
ヨーク一体型シャフト。 A yoke for a universal joint, comprising: a base; and a pair of coupling arms extending axially to one side from two radially opposite sides of the base;
And an inner shaft that extends from the radial center portion of the other axial side of the base to the other axial side and is provided integrally with the yoke.
On the outer peripheral surface of one axial end of the inner shaft, there is provided an inclined curved surface with a concaved cross section which is inclined so that the outer diameter becomes larger toward one axial direction,
Of the outer peripheral surface of the base portion, at least the other axial end and the middle portion are provided with convex curved portions inclined in such a direction that the outer shape becomes smaller toward the other axial side,
The thickness of the portion connecting the pair of coupling arms in the base of the yoke is thicker than the thickness of the coupling arms,
A yoke-integrated shaft in which one axial end edge of the inclined curved surface portion and the other axial end edge of the convex curved surface portion are provided on the other axial surface side of the base via a flat surface portion. 前記インナシャフトの中心軸に対する、前記傾斜曲面部の軸方向片端縁の接線の傾斜角度が９０゜未満になっている、
請求項１に記載したヨーク一体型シャフト。 The inclination angle of the tangent of the axial one end edge of the inclined curved surface portion with respect to the central axis of the inner shaft is less than 90 °.
The yoke integrated shaft according to claim 1. 前記傾斜曲面部は、軸方向片側に向かう程外径が大きくなるように傾斜した断面凹円弧状である、
請求項１又は２に記載したヨーク一体型シャフト。 The inclined curved surface portion has a concaved circular arc shape that is inclined such that the outer diameter increases toward one side in the axial direction.
The yoke integrated shaft according to claim 1 or 2 . 前記平坦面部は、前記基部の軸方向に直交する、
請求項１〜３のいずれか１項に記載したヨーク一体型シャフト。 The flat surface portion is orthogonal to the axial direction of the base portion.
The yoke integrated shaft according to any one of claims 1 to 3 . 請求項１〜４のうちの何れか１項に記載したヨーク一体型シャフトと、
前記インナシャフトに対してトルク伝達可能に且つ軸方向の相対変位可能に外嵌されたアウタチューブとを備え、
前記アウタチューブの軸方向片端縁が前記傾斜曲面部又は前記平坦面部に接触する位置まで、全長を収縮可能になっている、
伸縮軸。 A yoke-integrated shaft according to any one of claims 1 to 4 ;
And an outer tube externally torqued relative to the inner shaft and capable of transmitting torque relative to the inner shaft.
The entire length can be shrunk to a position where one axial end of the outer tube contacts the inclined curved surface or the flat surface.
Telescopic axis. 前記アウタチューブの軸方向片端部の内周面は、前記アウタチューブの前記軸方向片端縁が前記平坦面部に接触する位置まで、全長を収縮可能になるように、テーパ状に形成される、
請求項５に記載した伸縮軸。 The inner peripheral surface of one axial end of the outer tube is tapered so that the entire length can be contracted to a position where the axial one end of the outer tube contacts the flat surface.
A telescopic shaft according to claim 5 . 前記アウタチューブの軸方向片端部の内周面は、前記アウタチューブの前記軸方向片端縁が前記平坦面部に接触する位置まで、全長を収縮可能になるように、前記アウタチューブの雌スプライン部より大径の円筒状に形成される、
請求項５に記載した伸縮軸。 The inner peripheral surface of one axial end of the outer tube is made from the female spline of the outer tube so that the entire length can be shrunk to a position where the one axial end of the outer tube contacts the flat surface. Formed in a large diameter cylindrical shape,
A telescopic shaft according to claim 5 .
JP2017535503A 2015-08-20 2016-08-09 Yoke integrated shaft and telescopic shaft Active JP6528848B2 (en)

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US5716276A (en) * 1996-09-03 1998-02-10 Dana Corporation Yoke shaft for a vehicular driveshaft assembly
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