JPS62275887A - Manufacture of crown-less front fork made of light metal - Google Patents
Manufacture of crown-less front fork made of light metalInfo
- Publication number
- JPS62275887A JPS62275887A JP11718486A JP11718486A JPS62275887A JP S62275887 A JPS62275887 A JP S62275887A JP 11718486 A JP11718486 A JP 11718486A JP 11718486 A JP11718486 A JP 11718486A JP S62275887 A JPS62275887 A JP S62275887A
- Authority
- JP
- Japan
- Prior art keywords
- light metal
- sleeve
- stem
- crown
- front fork
- 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.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims description 18
- 239000002184 metal Substances 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000005304 joining Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 10
- 229910000838 Al alloy Inorganic materials 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000002271 resection Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Landscapes
- Steering Devices For Bicycles And Motorcycles (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
３、発明の詳細な説明
自転車用のクラウンレス前フオ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] 3. Detailed Description of the Invention Regarding the manufacturing method of a crownless front fork for a bicycle, Japanese Patent No. 1,258,506 (Publication No. 1983-37136)
) is disclosed.
本発明は前フオークのさや（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 (referred to as the blade) of the front fork is made of aluminum alloy.
一般に自転車の前フオークはステム、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 is the stem, crown (shoulder),
It consists of three parts: a pair of sheaths (blades).
In the present application, of the three parts mentioned above, a part of the sheath is used as a substitute for the crown, thereby reducing the cost of manufacturing the bicycle.
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 sheaths are formed from a tube, the curved upper part of the sheath is used as a crown, and these sheaths are welded to a stem.''
本発明は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。In the present invention, when a pair of sheaths are made from light metal tubes, such as aluminum or aluminum alloys, and welded to the stem, special care has been taken to increase the strength of the weld.
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５ｏｏｏ乃至７０００シリーズのアルミニ
ウム合金製の管材である。While the sheath material used in the above patent is a steel tube, in the present invention the sheath material is a light metal tube, particularly a tube made of magnesium-containing 5ooo to 7000 series aluminum alloy.
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
るものとし芸では省略する。The method of bending one end of this aluminum alloy tube by approximately 90 degrees, using the bent portion of the upper end as a part of the crown, and forming it into the desired sheath is based on a known method and is omitted in the illustration. .
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 invention will now be described 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 sectional view according to the present invention, in which the lower part of a cylindrical stem 1 is tapered as shown in the figure, and a cylindrical sleeve 2 that fits around this tapered cylinder is installed. , the entire stem, consisting of stem body 1 and sleeve 2, is sandwiched between a pair of pre-shaped 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 sheath 3.4 is also called a blade, and a pawl 5.6 is installed at its lower end, the upper end of a light metal tube such as aluminum or aluminum alloy is bent about 90 degrees to serve as a crown, and the lower end is equipped with a pawl 5.6. Use one made by molding.
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 is made of a steel pipe or special steel such as chromium-molybdenum steel.
ステムＩ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 I is made of light metal, ie, 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。Generally, the following method can be considered as a method for bonding or fixing the steel stem 1 and the light metal sleeve 2.
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 thread cutting Method 1 above is prone to deterioration when baking paint is applied to the bicycle frame, as the temperature reaches 150 to 200 degrees, and method 2 also applies to dissimilar metals. Since it is in between, there is a problem in terms of strength.
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, we decided to adopt friction welding as a method to effectively join 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
金属間の接合に掻めて有効であることが判明したのであ
る。As is well known, friction welding is a method of joining two metal materials by applying high pressure using the thermal energy generated by rotating one material and causing friction. In the present invention, it was found that the method is extremely effective for joining dissimilar metals such as 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。The second cross-sectional view shows the upper ends of the pair of sheaths 3.4 welded to both sides of the light metal sleeve 2 of the entire stem formed by joining the stem 1 and the sleeve 2 by friction welding as described above. The portion 7 shown in the figure, which requires a slight cut out of the upper periphery of the sleeve 2, is for subsequent 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 will disappear if the sheath 3 is adhered 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 resection portion 7 has been removed 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
フオークの外観を示し、スリーブ２の切除部分７の一部
分のみを示す。FIG. 4 shows the external appearance of a light metal crownless fork completed according to the present invention, showing only a portion of the cut-out 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
ス前フオ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 mentioned above, the present invention relates to a cylindrical stem supporting a crownless front fork made of a light metal sheath such as aluminum or aluminum alloy, which is lightweight and beautiful. This design has been devised to effectively connect the stem and sheath by attaching a synthetic sleeve, which is an advantage for the bicycle industry.
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図は本発明の前フオークの外観図である。The drawings show the method of the present invention. Figure 1 is a cross-sectional view of the stem of the present invention placed in the center with sheaths for crownless use on both sides, and Figure 2 is a cross-sectional view of the stem of the present invention placed in the center with sheaths for crownless use on both sides. FIG. 3 is a sectional view showing the removed portion, and FIG. 4 is an external view of the front fork of the present invention.
Claims (1)
、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り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。Prepare a steel pipe with a predetermined length and diameter and a tapered lower end, prepare a light metal pipe sleeve that surrounds the area including the tapered part and can fit tightly in accordance with the shape of the tapered part, and insert the steel pipe into the sleeve. A stem made by joining the steel pipe and the light metal sleeve by friction welding is installed in the center, and a separately formed light metal pipe is placed on both sides of the light metal sleeve of the stem to form half of the crown. A method of manufacturing a crownless front fork made of light metal for automobiles, characterized by welding a pair of dual-purpose sheaths.
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 true JPS62275887A (en) | 1987-11-30 |
| JPH069994B2 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106585827A (en) * | 2015-10-20 | 2017-04-26 | 良丰机械股份有限公司 | Front fork arm and front fork |
-
1986
- 1986-05-23 JP JP11718486A patent/JPH069994B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106585827A (en) * | 2015-10-20 | 2017-04-26 | 良丰机械股份有限公司 | Front fork arm and front fork |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH069994B2 (en) | 1994-02-09 |
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