JPH069994B2 - Light metal crownless front fork manufacturing method - Google Patents
Light metal crownless front fork manufacturing methodInfo
- Publication number
- JPH069994B2 JPH069994B2 JP11718486A JP11718486A JPH069994B2 JP H069994 B2 JPH069994 B2 JP H069994B2 JP 11718486 A JP11718486 A JP 11718486A JP 11718486 A JP11718486 A JP 11718486A JP H069994 B2 JPH069994 B2 JP H069994B2
- Authority
- JP
- Japan
- Prior art keywords
- light metal
- stem
- sleeve
- front fork
- crownless
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 自転車用のクラウンレス前フォークの製法については日
本特許1,258,506（公告昭59−37136）の開示がある。[Detailed Description of the Invention] Japanese Patent No. 1,258,506 (Publication No. 59-37136) discloses a method of manufacturing a crownless front fork for a bicycle.
本発明は前フォークのさや（ブレードと云う）がアルミ
ニウム合金製である場合に関するものである。The present invention relates to the case where the sheath (called a blade) of the front fork is made of an aluminum alloy.
一般に自転車の前フォークはステム、クラウン（肩）、
一対のさや（ブレード）という３部品より成るもので、
本出願においては上記３部品の内、クラウンをさやの一
部を以て代用し、自転車製造コストを低減するにある。Generally, the front fork of a bicycle has a stem, a crown (shoulder),
It consists of three parts, a pair of pods (blades),
In the present application, the crown is substituted with a part of the pod among the above-mentioned three parts to reduce the bicycle manufacturing cost.
上記特許の要旨は「一対のさやを管材から成形し、さや
の弯曲上部をクラウンとして代用し、これらのさやをス
テムに溶接して成る」ものである。The gist of the above patent is that "a pair of pods are formed from a pipe material, the curved upper part of the pod is used as a crown, and these pods are welded to a stem."
本発明の一対のさやを軽金属即ちアルミニウム又はその
合金の管材から製作し、ステムに溶接するに当って、溶
接強さを増すために特に苦心したのである。It was particularly difficult to make the pair of sheaths of the present invention from a pipe material of light metal, that is, aluminum or its alloy, and to weld them to the stem in order to increase the welding strength.
上記特許において用いられたさやの材料は鋼管である
が、本発明においてはさやの材料は軽金属管、特にマグ
ネシウム含有の5000乃至7000シリーズのアルミニウム合
金製の管材である。The sheath material used in the above patents is a steel pipe, but in the present invention, the sheath material is a light metal pipe, in particular, a magnesium-containing 5000 to 7000 series aluminum alloy pipe material.
このアルミニウム合金製管材の一端を約90度折曲げて、
この上端折曲げ部をクラウンの一部として代用し、所要
のさやに成形する方法については公知の方法に準拠する
ものとし茲では省略する。Bend one end of this aluminum alloy tube about 90 degrees,
This upper end bent portion is used as a part of the crown, and the method for forming the desired sheath is based on a known method and is omitted here.
本発明の一実施例を添付図面について以下に述べる。An embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図は本発明による断面図を示し、円筒状ステム１の
下方は図のようにテーパーとなって居り、このテーパー
状円筒の周囲には、この外周に適合する円筒状スリーブ
２が設置され、ステム本体１とスリーブ２とから成るス
テム全体が、あらかじめ成形された一対のさや３、４の
間に挟まれて居る。FIG. 1 shows a cross-sectional view according to the present invention, in which a lower portion of a cylindrical stem 1 is tapered as shown in the drawing, and a cylindrical sleeve 2 adapted to the outer circumference is installed around the tapered cylinder. The entire stem consisting of the stem body 1 and the sleeve 2 is sandwiched between a pair of preformed sheaths 3, 4.
さや３、４はブレードとも呼ばれて居り、その下端はつ
め５、６が設置され、何れも軽金属例えばアルミニウム
又はアルミニウム合金の管材の上端を約90度折曲げてク
ラウンの代用とし、下端につめを成形して作られている
ものを用いる。The sheaths 3 and 4 are also called blades, and the lower ends thereof are provided with the pawls 5 and 6. In each case, the upper end of a pipe material of light metal such as aluminum or aluminum alloy is bent about 90 degrees to substitute for the crown, and the pawls are attached to the lower end. What is made by molding is used.
ステム本体１は鋼管又は特殊鋼例えばクロム・モリブデ
ン鋼の管材を用いる。The stem body 1 uses a steel pipe or a pipe material of special steel such as chrome / molybdenum steel.
ステム１の下端に設置する円筒スリーブ２は軽金属即ち
アルミニウム乃至アルミニウム合金より成るものを用い
る。The cylindrical sleeve 2 installed at the lower end of the stem 1 is made of light metal, that is, aluminum or aluminum alloy.
鋼製ステム１と軽金属製スリーブ２とを接着乃至固着す
る方法として一般に以下の方法が考えられる。The following method is generally considered as a method for adhering or fixing the steel stem 1 and the light metal sleeve 2 to each other.
１．半田又はろう付 ２．ねじ切による機械的接合 上記の１の方法は自転車フレームに対し焼付塗装を行う
と、その温度が150乃至200度にも達するため劣化し易
く、２の方法も異種金属間であるため強度の点から難点
がある。1. Soldering or brazing 2. Mechanical joining by screw cutting In the above method 1, when the bicycle frame is baked and coated, the temperature can reach 150 to 200 degrees, and it easily deteriorates. There are difficulties.
そこで鋼製ステムと軽金属製スリーブとを効果的に接合
する方法として摩擦圧接法を採用することにしたのであ
る。Therefore, the friction welding method was adopted as a method for effectively joining the steel stem and the light metal sleeve.
周知のように摩擦圧接法とは２つの金属材料間におい
て、一つの材料を回転させて摩擦することにより発生す
る熱エネルギーを利用し、高圧を加え２つの金属材料を
接合するものであり、本発明において鋼と軽金属との異
種金属間の接合に極めて有効であることが判明したので
ある。As is well known, the friction welding method is a method for joining two metal materials by applying high pressure by using thermal energy generated by rotating and rubbing one material between two metal materials. In the invention, it has been found that it is extremely effective for joining dissimilar metals of steel and light metal.
上述のように摩擦圧接によってステム１とスリーブ２と
が接合して成るステム全体の軽金属製スリーブ２の両側
に、一対のさや３、４の上端を溶接して接合して成る断
面図は第２図に示し、スリーブ２の上方周囲を僅かばか
り切除すべき部分７は、ステム１の事後加工のためであ
る。As described above, a cross-sectional view obtained by welding the upper ends of the pair of sheaths 3 and 4 to both sides of the light metal sleeve 2 of the entire stem, which is formed by joining the stem 1 and the sleeve 2 by friction welding, is shown in FIG. The portion 7 shown in the figure, which is to be slightly cut off around the upper periphery of the sleeve 2, is for the post-processing of the stem 1.
第１図にスリーブ２とさや３との間の間隙８があるが、
これはスリーブ２にさや３を接着させれば消滅するもの
である。In FIG. 1, there is a gap 8 between the sleeve 2 and the sheath 3,
This disappears when the sheath 3 is bonded to the sleeve 2.
第３図はスリーブ２より切除部分７を切除したことを示
す。FIG. 3 shows that the cut portion 7 is cut from the sleeve 2.
第４図は本発明により完成した軽金属製クラウンレス前
フォークの外観を示し、スリーブ２の切除部分７の一部
分のみを示す。FIG. 4 shows the appearance of the light metal crownless front fork completed by the present invention, and shows only a part of the cut portion 7 of the sleeve 2.
上述のように本発明は軽量で美しいアルミニウム又はア
ルミニウム合金の如き軽金属製さやより成るクラウンレ
ス前フォークを支持する円筒状ステムについて、本体は
鋼管として強度を備え、軽金属製さやを接合するために
軽金属製スリーブを装着してステムとさやとの接合を効
果的に実現できるように工夫したもので、自転車業界に
とって一つのメリットとなるものである。As described above, the present invention relates to a cylindrical stem that supports a crownless front fork made of a light and beautiful light metal sheath such as aluminum or aluminum alloy, the main body has strength as a steel pipe, and the light metal sheath is used to join the light metal sheath. This is one of the merits for the bicycle industry, as it has been devised so that the stem and the sheath can be effectively joined by attaching a sleeve made of steel.
図面は本発明方法を示すもので第１図は本発明のステム
を中央に置き両側にクラウンレス用のさやを配置した断
面図、第２図はステムに一対のさやを接合し事後加工の
切除部分を示す断面図、第３図は切除部分を切除した断
面図、第４図は本発明の前フォークの外観図である。 １……円筒状ステム、２……円筒状スリーブ ３……さや、5,6……つめ ８……間隙、７……切除部分The drawings show the method of the present invention. FIG. 1 is a cross-sectional view in which the stem of the present invention is placed at the center and crownless pods are arranged on both sides, and FIG. 2 is a cutting of post-processing by joining a pair of pods to the stem. FIG. 3 is a cross-sectional view showing a portion, FIG. 3 is a cross-sectional view in which a cut portion is cut, and FIG. 4 is an external view of a front fork of the present invention. 1 ... Cylindrical stem, 2 ... Cylindrical sleeve 3 ... Sheath, 5,6 ... Pawl 8 ... Gap, 7 ... Cutaway part
Claims (1)
鋼管を用意し、該テーパー部分を含む領域を包囲し且つ
該テーパー部分の形状に対応し密着可能の軽金属管スリ
ーブを用意し、該鋼管を該スリーブ内に挿入し、該鋼管
と該軽金属製スリーブとを摩擦圧接法によって接合させ
て成るステムを中央に設置し、該ステムの該軽金属製ス
リーブの両側に別途成形の軽金属管より成るクラウンの
半分を兼用する一対のさやを溶接して成ることを特徴と
する自動車用軽金属製クラウンレス前フォークの製作
法。1. A tapered steel pipe having a predetermined length and diameter at its lower end is prepared, and a light metal pipe sleeve is provided which surrounds a region including the tapered portion and can be adhered to the tapered portion according to the shape of the tapered portion. The stem is formed by inserting the steel pipe into the sleeve, and joining the steel pipe and the light metal sleeve by a friction welding method, and the stem is formed on both sides of the light metal sleeve of the stem by a separately molded light metal pipe. A method for manufacturing a crownless front fork made of a light metal for an automobile, characterized by welding a pair of pods that also serve as half of the formed crown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11718486A JPH069994B2 (en) | 1986-05-23 | 1986-05-23 | Light metal crownless front fork manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11718486A JPH069994B2 (en) | 1986-05-23 | 1986-05-23 | Light metal crownless front fork manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62275887A JPS62275887A (en) | 1987-11-30 |
| JPH069994B2 true JPH069994B2 (en) | 1994-02-09 |
Family
ID=14705494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11718486A Expired - Lifetime JPH069994B2 (en) | 1986-05-23 | 1986-05-23 | Light metal crownless front fork manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH069994B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106585827B (en) * | 2015-10-20 | 2019-01-04 | 良丰机械股份有限公司 | Front cross-arm and front fork |
| CN106584019A (en) * | 2015-10-20 | 2017-04-26 | 良丰机械股份有限公司 | Manufacturing method of front forked arms and manufacturing method of front fork |
-
1986
- 1986-05-23 JP JP11718486A patent/JPH069994B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62275887A (en) | 1987-11-30 |
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