JP4017251B2

JP4017251B2 - Manufacturing method for vehicle parts

Info

Publication number: JP4017251B2
Application number: JP12608598A
Authority: JP
Inventors: 眞男岡村; 惣次高橋; 孝中山; 光一伊藤
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1998-05-08
Filing date: 1998-05-08
Publication date: 2007-12-05
Anticipated expiration: 2018-05-08
Also published as: JPH11321738A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば自動二輪車のメインスタンド等の枢支部と一対の脚部等を備えた車両用部品に関する。
【０００２】
【従来の技術】
従来、自動二輪車のメインスタンドとして、図８に示すような形態のものが知られている。
このメインスタンド５１は、車体側の支持軸等に回動自在に嵌合されるピボットパイプ５２と、このピボットパイプ５２の両端部に溶接止めされて斜め方向に延出する左右一対のスタンドパイプ５３、５３と、左右のスタンドパイプ５３、５３の中間部に溶接止めされて両者を連結するクロスパイプ５４と、左右のスタンドパイプ５３、５３の基端側に溶接止めされるスタンドストッパ５５を備えており、ピボットパイプ５２の上部には、ストッパプレート５６が溶接止めされている。
【０００３】
そしてスタンドパイプ５３の下端面には、トレッドプレート５７が取付けられるとともに、左側のスタンドパイプ５３の下部には、パッチ材５８を介してトレッドバー５９が固定され、また上部には、キーロックヒンジ６０が固定されている。更に右側のスタンドパイプ５３には、スプリングフック６１が固定され、これらトレッドプレート５７、パッチ材５８、トレッドバー５９、キーロックヒンジ６０、スプリングフック６１はいずれも溶接止めされている。
【０００４】
【発明が解決しようとする課題】
ところで、このような従来構造のメインスタンドは、溶接で固定する部品点数が多く、接合作業に工数を要するという問題がある。
【０００５】
本発明は上記問題点に鑑みなされたものであり、その目的は、必要な強度等を確保した上で、溶接部品を少なくし接合作業を削減することにある。
【０００６】
【課題を解決するための手段】
上記目的を達成するため本発明は、スタンドの製造方法として、金属製棒状素材の中間部を曲げ軸まわりに折曲げて略くの字型或いは略コの字型に曲げて左右一対の脚部を成形した後、この曲げ成形品の中間部に前記曲げ軸方向から圧縮荷重を加えて左右の脚部の中間に偏平部を成形し、この偏平部と両脚部の境界部附近を、前記曲げ軸に直交する線と平行な折返し軸周りに丸曲げして筒形状に成形するとともに、偏平部の先端側を両脚部の間に向けて延出させ、この延出部の少なくとも一部を両脚部の所定箇所に接合するようにした。
【０００７】
このように筒部と左右の脚部と補強部を単一の金属棒状素材で一体に成形すれば、部品点数が集約され、溶接工程を削減することが出来る。
ここで金属材料は、鋼管等が適用されるが、それ以外の材質のものでも良く、中実素材でも良い。
【００１０】
そして、偏平部に形成した筒形状を車体側の支持軸に揺動自在に嵌合させる筒部とし、この筒部に連なる両延出部を脚部にするとともに、偏平部の一部を脚部に接合して補強部とする。
【００１１】
【発明の実施の形態】
本発明の実施の形態について添付した図面に基づき説明する。
ここで図１は本発明に係る車両用部品の適用例を示す二輪車のスタンドの正面図、図２は同側面図、図３は図１のＡ−Ａ線断面図、図４乃至図７は本発明に係る製造方法の工程図である。
【００１２】
本発明に係る車両用部品は、図１及び図２に示すような自動二輪車のメインスタンド１に適用され、１本のスチールパイプから成形されたスタンド本体２と、このスタンド本体２の所定部に取付けられる各種附属部品を備えており、前記スタンド本体２は、車体側に連結される筒部２ｑと、この筒部２ｑの両端から略ハの字型の形状で延出する左右一対の脚部２ｓ、２ｓと、この脚部２ｓ、２ｓを補強する補強部２ｒを備えている。
【００１３】
また前記各種附属部品は、筒部２ｑの上部に溶接で固定されるストッパプレート３と、左の脚部２ｓに溶接で固定されるパッチ材４及びトレッドバー５と、右の脚部２ｓに溶接で固定されるスプリングフック６等から構成されている。
【００１４】
前記スタンド本体２の筒部２ｑと脚部２ｓと補強部２ｒは、前述のように１本のスチールパイプから一体成形されているが、その成形は、スチールパイプを再結晶温度以上に加熱して加工する熱間圧造によって、図４乃至図７に示すような加工工程を踏んで成形される。
【００１５】
すなわち、図４に示すように、パイプＰの中間部を曲げ軸ｚ周りに折曲げて略くの字型の曲げパイプＰを成形した後、図５に示すように、曲げ部周辺に曲げ軸ｚ方向から圧縮荷重を加えて、２ヵ所のパイプ部Ｐｐ、Ｐｐの中間に偏平部Ｐｈを成形する。
【００１６】
次いで、図６に示すように、偏平部Ｐｈの基端側を折返し軸ｘ周りに丸曲げして筒形状を成形する。
ここで折返し軸ｘは、前記曲げ軸ｚに直交し、且つ、両パイプ部Ｐｐ、Ｐｐの端部を結ぶ線ａと平行な軸である。
【００１７】
そして、偏平部Ｐｈは筒形状を形成した後、図７に示すように、所定形状に折り曲げられながら先端部がくの字型の両パイプ部Ｐｐ、Ｐｐの間に入り込むよう折返され、接合部が両パイプ部Ｐｐ、Ｐｐに溶接で固着される。
このような方法で、偏平部Ｐｈの筒形状が図１、図２の筒部２ｑとされ、くの字型の両パイプ部Ｐｐ、Ｐｐが図１、図２の脚部２ｓ、２ｓにされるとともに、偏平部Ｐｈの延出部が図１、図２の補強部２ｒとされてスタンド本体２が成形される。
【００１８】
また、以上のようなスタンド本体２は、熱間圧造で成形されるため、金属材料の結晶粒の微細化、組織の均一化が図られ、機械的強度を向上させることが出来る。
【００１９】
以上のようなスタンド本体２は、図８に示す従来の左右のスタンドパイプ５３と、ピボットパイプ５２と、クロスパイプ５４と、スタンドストッパ５５が一体化されているため、部品点数が少なくなり、溶接作業工数を削減することが可能である。
尚、本実施形態においては、パイプＰをスチールパイプで成形しているが、パイプＰの材質はスチールパイプ以外のものでも良く、またパイプ以外の中実素材でも良い。またパイプＰを曲げる際、略コの字型に成形するようにしても良い。
【００２０】
尚、本発明は以上のような実施形態に限定されるものではない。本発明の特許請求の範囲に記載した事項と実質的に同一の構成を有し、同一の作用効果を奏するものは本発明の技術的範囲に属する。
例えば本発明は、二輪車の後輪用のスイングアームや、四輪バギー車その他の車輪懸架用スイングアーム等、揺動枢支部（筒部）と一対の脚部を有する部品にも同様に適用することが出来る。
【００２１】
【発明の効果】
以上のように本発明は、車体側の支持軸に揺動自在に嵌合し得る筒部と、この筒部の両端部から直角或いは斜め方向に延出する左右一対の脚部と、これら脚部の所定箇所を連結する補強部を単一の金属製棒状素材から一体に成形するようにし、部品点数が集約され、溶接工程を削減することが出来、熱間圧造で一体成形する場合において、請求項１のような方法で成形すれば、１本の金属製棒状素材から効率的に成形出来る。
【図面の簡単な説明】
【図１】本発明に係る車両用部品の一実施形態を示す二輪車のスタンドの正面図
【図２】同側面図
【図３】図１のＡ−Ａ線断面図
【図４】スタンド本体の製造工程の第１段階としてパイプを折曲げた状態図
【図５】同製造工程の第２段階として折曲げ部周辺に偏平部を形成した状態図
【図６】同製造工程の第３段階として偏平部の基端側に筒形状を成形した状態図
【図７】同製造工程の第４段階として偏平部の先端側を両方のパイプ部に入り込ませる状態で折返した状態図
【図８】従来の一般的な自動二輪車のメインスタンドを示す正面図
【符号の説明】
１…メインスタンド、２…スタンド本体、２ｑ…筒部、２ｒ…補強部、２ｓ…脚部、Ｐ…パイプ、Ｐｈ…偏平部、Ｐｐ…パイプ部、ｚ…曲げ軸。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle component including a pivotal support portion such as a main stand of a motorcycle and a pair of leg portions.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a motorcycle as shown in FIG. 8 is known as a main stand for a motorcycle.
The main stand 51 includes a pivot pipe 52 that is rotatably fitted to a support shaft or the like on the vehicle body side, and a pair of left and right stand pipes 53 that are welded to both ends of the pivot pipe 52 and extend obliquely. 53, a cross pipe 54 welded to the middle part of the left and right stand pipes 53, 53 to connect them, and a stand stopper 55 welded to the base end side of the left and right stand pipes 53, 53. A stopper plate 56 is welded to the upper part of the pivot pipe 52.
[0003]
A tread plate 57 is attached to the lower end surface of the stand pipe 53, a tread bar 59 is fixed to the lower portion of the left stand pipe 53 via a patch material 58, and a key lock hinge 60 is attached to the upper portion. Is fixed. Further, a spring hook 61 is fixed to the stand pipe 53 on the right side, and these tread plate 57, patch material 58, tread bar 59, key lock hinge 60, and spring hook 61 are all welded.
[0004]
[Problems to be solved by the invention]
By the way, the main stand having such a conventional structure has a problem in that the number of parts to be fixed by welding is large and man-hours are required for joining work.
[0005]
The present invention has been made in view of the above problems, and an object of the present invention is to reduce the number of welding parts and reduce the joining work while ensuring the necessary strength and the like.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a stand manufacturing method in which an intermediate portion of a metal rod-like material is bent around a bending axis to be bent into a substantially U shape or a substantially U shape, and a pair of left and right leg portions. Then, a compressive load is applied to the middle part of the bent product from the direction of the bending axis to form a flat part in the middle of the left and right leg parts, and the vicinity of the boundary part between the flat part and both leg parts is bent. The tube is bent around a folding axis parallel to a line perpendicular to the axis and formed into a cylindrical shape, and the tip of the flat part is extended between both legs, and at least a part of this extension is attached to both legs. It was made to join to the predetermined location of the part.
[0007]
If the cylindrical portion, the left and right leg portions, and the reinforcing portion are integrally formed with a single metal rod-like material in this way, the number of parts can be integrated and the welding process can be reduced.
Here, a steel pipe or the like is applied as the metal material, but other metal materials or solid materials may be used.
[0010]
The cylindrical portion formed in the flat portion is a cylindrical portion that is swingably fitted to the support shaft on the vehicle body side, and both extending portions connected to the cylindrical portion are leg portions, and a part of the flat portion is a leg portion. Join the part to make it a reinforced part.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
Here, FIG. 1 is a front view of a motorcycle stand showing an application example of a vehicle component according to the present invention, FIG. 2 is a side view thereof, FIG. 3 is a cross-sectional view taken along line AA of FIG. It is process drawing of the manufacturing method which concerns on this invention.
[0012]
The vehicle component according to the present invention is applied to a main stand 1 of a motorcycle as shown in FIGS. 1 and 2, and a stand body 2 formed from one steel pipe, and a predetermined portion of the stand body 2. The stand body 2 includes a cylindrical part 2q connected to the vehicle body side, and a pair of left and right leg parts extending from both ends of the cylindrical part 2q in a substantially square shape. 2s and 2s, and a reinforcing part 2r that reinforces the leg parts 2s and 2s.
[0013]
The various accessory parts are welded to the stopper plate 3 fixed to the upper portion of the cylindrical portion 2q by welding, the patch material 4 and the tread bar 5 fixed to the left leg portion 2s by welding, and the right leg portion 2s. It is comprised from the spring hook 6 etc. which are fixed by.
[0014]
The cylindrical portion 2q, the leg portion 2s, and the reinforcing portion 2r of the stand body 2 are integrally formed from one steel pipe as described above, but the forming is performed by heating the steel pipe to a recrystallization temperature or higher. By hot forging to be processed, the molding is performed through the processing steps as shown in FIGS.
[0015]
That is, as shown in FIG. 4, after the intermediate portion of the pipe P is bent around the bending axis z to form a substantially U-shaped bending pipe P, the bending shaft is formed around the bending portion as shown in FIG. A flat load Ph is formed between the two pipe portions Pp and Pp by applying a compressive load from the z direction.
[0016]
Next, as shown in FIG. 6, the base end side of the flat portion Ph is rounded around the folding axis x to form a cylindrical shape.
Here, the folding axis x is an axis that is orthogonal to the bending axis z and is parallel to the line a connecting the ends of the pipe portions Pp and Pp.
[0017]
Then, after the flat portion Ph is formed in a cylindrical shape, as shown in FIG. 7, the tip portion is folded back so as to enter between the two pipe-shaped portions Pp and Pp of the dogleg shape while being bent into a predetermined shape. Both pipe parts Pp and Pp are fixed by welding.
By such a method, the cylindrical shape of the flat portion Ph is changed to the cylindrical portion 2q shown in FIGS. 1 and 2, and the two dog-shaped pipe portions Pp and Pp are changed to the leg portions 2s and 2s shown in FIGS. At the same time, the extended portion of the flat portion Ph is used as the reinforcing portion 2r in FIGS. 1 and 2, and the stand body 2 is formed.
[0018]
Moreover, since the above-mentioned stand main body 2 is shape | molded by hot forging, the refinement | miniaturization of the crystal grain of a metal material and the homogenization of a structure | tissue can be achieved, and mechanical strength can be improved.
[0019]
Since the conventional stand body 2 shown in FIG. 8 is integrated with the left and right stand pipes 53, the pivot pipe 52, the cross pipe 54, and the stand stopper 55 shown in FIG. Work man-hours can be reduced.
In this embodiment, the pipe P is formed of a steel pipe, but the material of the pipe P may be other than a steel pipe, or may be a solid material other than a pipe. Further, when the pipe P is bent, it may be formed into a substantially U-shape.
[0020]
The present invention is not limited to the above embodiment. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the present invention is similarly applied to components having a swinging pivotal support portion (cylinder portion) and a pair of leg portions, such as a swing arm for a rear wheel of a two-wheeled vehicle, a four-wheel buggy vehicle, and other swing arms for wheel suspension. I can do it.
[0021]
【The invention's effect】
The present invention as described above, a cylindrical portion capable of fitting swingably supporting shaft of the car body side, a pair of right and left leg portions extending at right angles or oblique direction from both ends of the cylindrical portion, the legs a reinforcing portion for connecting the predetermined portion of parts so as to integrally formed from a single metallic rod-like material, component count is aggregated and come out to reduce the welding process, be integrally formed by hot forging In this case, if it is formed by the method as claimed in claim 1 , it can be efficiently formed from one metal rod-shaped material.
[Brief description of the drawings]
1 is a front view of a motorcycle stand showing an embodiment of a vehicle component according to the present invention. FIG. 2 is a side view of the same. FIG. 3 is a cross-sectional view taken along line AA in FIG. State diagram of pipe bent as the first step of the manufacturing process. FIG. 5 State diagram of forming flat portions around the bent portion as the second stage of the manufacturing process. FIG. 6 As the third step of the manufacturing process. FIG. 7 is a state diagram in which a cylindrical shape is formed on the base end side of the flat portion. FIG. 7 is a state diagram in which the distal end side of the flat portion is turned back into both pipe portions as the fourth stage of the manufacturing process. Front view showing the main stand of a typical motorcycle
DESCRIPTION OF SYMBOLS 1 ... Main stand, 2 ... Stand main body, 2q ... Cylindrical part, 2r ... Reinforcement part, 2s ... Leg part, P ... Pipe, Ph ... Flat part, Pp ... Pipe part, z ... Bending axis.

Claims

Bending the middle part of the metal rod-shaped material around the bending axis into a substantially U-shape or a substantially U-shape, forming a pair of left and right legs, and bending the middle part of the bent product Applying a compressive load from the axial direction to form a flat part in the middle of the left and right leg parts, and rounding the vicinity of the boundary between the flat part and both leg parts around the folding axis parallel to the line perpendicular to the bending axis After bending and forming into a cylindrical shape, a step of extending the tip side of the flat portion toward both leg portions and a step of joining at least a part of the extension portion to a predetermined portion of both leg portions are provided. The manufacturing method of the components for vehicles characterized by this.