JPH0745889B2 - FRP taper leaf spring - Google Patents
FRP taper leaf springInfo
- Publication number
- JPH0745889B2 JPH0745889B2 JP61267087A JP26708786A JPH0745889B2 JP H0745889 B2 JPH0745889 B2 JP H0745889B2 JP 61267087 A JP61267087 A JP 61267087A JP 26708786 A JP26708786 A JP 26708786A JP H0745889 B2 JPH0745889 B2 JP H0745889B2
- Authority
- JP
- Japan
- Prior art keywords
- frp
- core material
- taper
- leaf spring
- length
- 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
Classifications
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/366—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers made of fibre-reinforced plastics, i.e. characterised by their special construction from such materials
- F16F1/368—Leaf springs
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、例えば自動車の懸架用ばね等に使用されるFR
Pテーパ板ばねに関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a FR used in, for example, a suspension spring of an automobile.
P Taper leaf spring.
繊維強化合成樹脂（FRP）製の板ばねを製造する場合、
例えば周知のフィラメントワインディング法（FW法）に
おいては、マトリックス樹脂を含浸させた一方向連続強
化繊維束を、マンドレルに連続的に巻取るようにしてい
る。この方法はFRP板ばねを能率良く生産できるが、マ
トリックス樹脂に対する強化繊維の含有率を一定にする
ためには、横断面積が長手方向に一定の板ばねしか成形
することができない。すなわち、全長にわたって等幅で
等厚の板ばねか、板幅と板厚とが互いに関連し合って変
化する特殊な形状の板ばねしか成形できない。When manufacturing leaf springs made of fiber reinforced synthetic resin (FRP),
For example, in the well-known filament winding method (FW method), a unidirectional continuous reinforcing fiber bundle impregnated with a matrix resin is continuously wound around a mandrel. Although this method can efficiently produce FRP leaf springs, only leaf springs having a constant cross-sectional area in the longitudinal direction can be formed in order to keep the content of reinforcing fibers in the matrix resin constant. That is, it is possible to form only a leaf spring having a uniform width and a uniform thickness over the entire length or a leaf spring having a special shape in which the plate width and the plate thickness change in association with each other.
そこで、マトリックス樹脂と強化繊維とからなるFRP材
の内部に、端部側の厚みが漸減するような形状の芯材を
埋設することが考えられた。すなわち第４図に例示され
るFRPテーパ板ばねａのように、FRP材ｂの内部に芯材ｃ
を埋設することによって、板幅が全長にわたって等しく
かつ長手方向に板厚の変化するFRPテーパ板ばねａが得
られる。上記芯材ｃは予め所定の形状に成形しておき、
FRP材ｂを成形する工程の途中で芯材ｃが挿入される。Therefore, it has been considered to embed a core material having a shape in which the thickness on the end side gradually decreases inside the FRP material composed of the matrix resin and the reinforcing fiber. That is, like the FRP taper leaf spring a illustrated in FIG. 4, the core material c is provided inside the FRP material b.
By embedding, the FRP taper leaf spring a having the same plate width over the entire length and changing the plate thickness in the longitudinal direction can be obtained. The core material c is previously formed into a predetermined shape,
The core material c is inserted during the process of molding the FRP material b.
従って上記FRPテーパ板ばねａは、芯材ｃの長さl0に相
当する部分の横断面積が長さ方向に変化し、板端部ｄは
横断面積が一定になる。すなわち芯材ｃの全長l0とテー
パ部の長さが互いに一致している。Therefore, in the FRP taper leaf spring a, the cross-sectional area of the portion corresponding to the length l 0 of the core material c changes in the longitudinal direction, and the plate end portion d has a constant cross-sectional area. That is, the total length l 0 of the core material c and the length of the tapered portion are the same.
ところが上述した従来のFRPテーパ板ばねａの疲労試験
を行なってみると、芯材ｃを使わないものに比べて早期
に破壊することが確認された。破壊は主に芯材ｃの端部
付近で生じ、その原因を追及したところ、芯材ｃの先端
の尖ったところがFRP材ｂの内側から「くさび」のよう
に食込むことにより、ここが破壊の起点になりやすいこ
とが判った。However, when the fatigue test of the conventional FRP taper leaf spring a described above was performed, it was confirmed that the FRP taper leaf spring fractured earlier than the one without the core material c. The destruction mainly occurs in the vicinity of the end of the core material c, and when the cause is investigated, the point where the tip of the core material c is eroded from the inside of the FRP material b like a "wedge" It was found that it is easy to become the starting point of.
従って本発明では、FRPテーパ板ばねの耐久性を向上さ
せるために次のような構造を採用した。Therefore, in the present invention, the following structure is adopted to improve the durability of the FRP taper leaf spring.
すなわち本発明は、マトリックス樹脂と強化繊維とから
なるFRP材の内部に、両端側の厚みがそれぞれテーパ状
に漸減する帯状の芯材を埋設することによって長手方向
中央から両端に向って板厚が減少するテーパ部を形成す
るようにしたFRPテーパ板ばねにおいて、上記芯材が上
記テーパ部よりも短くなるように上記芯材の長さをテー
パ部の長さ600mm当たり500〜540mmとし、かつ、上記芯
材の両端の長手方向延長線上に、上記マトリックス樹脂
のみを硬化させた樹脂部分を上記芯材の端からテーパ部
の端まで設けたことを特徴とするものである。上記樹脂
部分は、芯材の両端を尖らないように切断するとともに
芯材の切取られた部分にマトリックス樹脂を充填させる
ことにより形成される。That is, the present invention, in the FRP material consisting of the matrix resin and the reinforcing fiber, by embedding a strip-shaped core material whose thickness at both ends gradually taper, the plate thickness from the longitudinal center to both ends is In the FRP tapered leaf spring configured to form a taper portion that decreases, the length of the core material is 500 to 540 mm per 600 mm of the taper portion length so that the core material is shorter than the taper portion, and, A resin portion obtained by curing only the matrix resin is provided from the end of the core material to the end of the taper portion on extension lines in the longitudinal direction at both ends of the core material. The resin portion is formed by cutting both ends of the core material without sharpening and filling the cut-out portion of the core material with the matrix resin.
上記FRPテーパ板ばねによれば、芯材の外側をくるんで
いるFRP材のマトリックス樹脂がFRP材と一体に硬化し、
この樹脂部分の存在によって芯材の先端がFRP材に食込
むことが防止される。すなわち樹脂部分が芯材先端の
「くさび」効果を和らげ、FRPテーパ板ばねの耐久性の
向上につながる。According to the FRP taper leaf spring, the matrix resin of the FRP material wrapping the outside of the core material is cured together with the FRP material,
The presence of this resin portion prevents the tip of the core material from biting into the FRP material. That is, the resin portion softens the "wedge" effect at the tip of the core material, which leads to improvement in durability of the FRP taper leaf spring.
第１図および第２図に示された一実施例において、FRP
テーパ板ばね１は全長にわたって板幅が実質的にほぼ同
等である。このFRPテーパ板ばね１は、長さ方向中央部1
aが長さl1にわたって等厚でかつ平坦である。両側の部
分1bは長さl2にわたって端部側の厚みが漸減する形状を
なしている。この明細書では、中央部1aと両側の部分1b
を合わせた長さ（l1＋2l2）の領域をテーパ部と呼ぶ。
長さl1の部分は図示例のように平坦の場合もあるが、こ
の明細書ではこの場合も含めてテーパ部と称する。In one embodiment shown in FIGS. 1 and 2, the FRP
The taper leaf spring 1 has substantially the same plate width over the entire length. This FRP taper leaf spring 1 has a longitudinal center portion 1
a is uniform and flat over the length l 1 . The portions 1b on both sides have a shape in which the thickness on the end side gradually decreases over the length l 2 . In this description, the central portion 1a and the side portions 1b
The region of the combined length (l 1 + 2l 2 ) is called the tapered portion.
The portion having the length l 1 may be flat as in the illustrated example, but in this specification, including this case, it is referred to as a tapered portion.
板端部1cは長さl3にわたって横断面積が一定である。更
に詳しくは、第２図に示されるように板端部1cは、僅か
に曲率のついた部位1c′（長さl4）と、ほぼ完全に平坦
な形状の先端側の部位1c″（長さl5）とからなる。The plate edge 1c has a constant cross-sectional area over the length l 3 . More specifically, as shown in FIG. 2, the plate end portion 1c has a slightly curved portion 1c ′ (length l 4 ) and an almost completely flat tip portion 1c ″ (long length). L 5 ) and.
板端部1cには、板ばね１を自動車の車体等に連結するた
めに、図示しない目玉部材が取付けられる。この目玉部
材は、ボルトやナット等の固定用部材によって板端部1c
に締付けられるため、本実施例のように板端部1cが平坦
に形成されている方が、締付けによる局部応力の上昇が
発生せず、割れの防止につながる。また、板ばね１の中
央部1aにはボルトやナット等の固定用部材によってアク
スルハウジング等が取付けられるため、本実施例のよう
に中央部1aが平坦に形成されている方が、割れを防止す
る上で有利である。An eyeball member (not shown) is attached to the plate end portion 1c in order to connect the plate spring 1 to a vehicle body of an automobile or the like. This eyeball member is fixed to the plate end 1c by a fixing member such as a bolt or a nut.
Since the plate end 1c is formed flat as in the present embodiment, the local stress does not increase due to the tightening and the crack is prevented. Further, since the axle housing or the like is attached to the central portion 1a of the leaf spring 1 by a fixing member such as a bolt or a nut, the central portion 1a formed flat as in this embodiment prevents cracking. It is advantageous in doing so.
上記FRPテーパ板ばね１は、FRP材２の内部に帯状の芯材
３を埋設したものである。FRP材２は、板ばね１の長手
方向に引き揃えた一方向連続強化繊維と、これら繊維間
を埋めるマトリックス樹脂とからなる。そしてマトリッ
クス樹脂に対する強化繊維の含有率が長手方向の全域に
わたって実質的に等しくなるように、例えばフィラメン
トワインディング法によって成形される。The FRP taper leaf spring 1 is one in which a strip-shaped core material 3 is embedded inside an FRP material 2. The FRP material 2 is composed of unidirectional continuous reinforcing fibers that are aligned in the longitudinal direction of the leaf spring 1 and a matrix resin that fills the spaces between these fibers. Then, it is molded by, for example, a filament winding method so that the content ratio of the reinforcing fiber to the matrix resin is substantially equal over the entire area in the longitudinal direction.
一方、芯材３は、その長さ方向中央部3aが長さl1にわた
って等厚かつ平坦である。両側の部分3bは長さl6にわた
って端部側の厚みが漸減するテーパ形状をなしている。
かつ芯材３の両端面４は、尖らないように適当な厚みの
ところで板厚方向に切断され、各端面４は平らとなって
いる。芯材３の全長（l1＋2l6）は、前述したテーパ部
の全長（l1＋2l2）よりも短い。芯材３の材質および成
形方法は問わないが、本実施列の芯材３はマトリックス
樹脂と強化繊維とからなる。芯材３は、FRP材２を成形
する前に予め上記形状に成形されている。従って芯材３
は、FRP材２を成形する工程の途中でFRP材２に挿入され
る。芯材３のマトリックス樹脂はFRP材２のマトリック
ス樹脂と同じでもよいが、本実施例では双方のマトリッ
クス樹脂を互いに異ならせている。On the other hand, in the core material 3, the central portion 3a in the length direction is equal in thickness and flat over the length l 1 . The portions 3b on both sides have a tapered shape in which the thickness on the end side gradually decreases over the length l 6 .
Moreover, both end surfaces 4 of the core material 3 are cut in the plate thickness direction at an appropriate thickness so as not to be sharpened, and each end surface 4 is flat. The total length (l 1 + 2l 6 ) of the core material 3 is shorter than the total length (l 1 + 2l 2 ) of the tapered portion described above. The material of the core material 3 and the molding method are not limited, but the core material 3 in the present row is composed of matrix resin and reinforcing fibers. The core material 3 is molded in the above shape in advance before molding the FRP material 2. Therefore, the core material 3
Are inserted into the FRP material 2 during the process of molding the FRP material 2. The matrix resin of the core material 3 may be the same as the matrix resin of the FRP material 2, but both matrix resins are made different from each other in this embodiment.
芯材３の先端側、すなわち端面４から板端部1c方向にわ
たって、マトリックス樹脂のみからなる部分５が設けら
れている。この樹脂部分５は、FRP材２の成形時に使わ
れるマトリックス樹脂が強化繊維の間からしみ出て硬化
したものである。従ってこの樹脂部分５はFRP材２と一
体に硬化しているが強化繊維は実質的に含有していな
い。換言すると、FRPテーパ板ばね１のテーパ部の長さ
（l1＋2l2）に対応して、上述した芯材３と樹脂部分５
が設けられている。A portion 5 made of only the matrix resin is provided on the tip side of the core material 3, that is, from the end surface 4 to the plate end 1c direction. The resin portion 5 is formed by hardening the matrix resin used when the FRP material 2 is molded, exuding between the reinforcing fibers. Therefore, the resin portion 5 is hardened integrally with the FRP material 2, but does not substantially contain the reinforcing fiber. In other words, in accordance with the length (l 1 + 2l 2 ) of the taper portion of the FRP taper leaf spring 1, the core material 3 and the resin portion 5 described above are used.
Is provided.
下表は、芯材３の長さ（l1＋2l6）を４種類に変化させ
た場合の疲労試験結果である。テーパ部の長さ（l1＋2l
2）は600mmである。応力振幅は45±15kgf/mm2で変位は
一定とした。The table below shows the fatigue test results when the length (l 1 + 2l 6 ) of the core material 3 was changed to four types. Length of taper part (l 1 + 2l
2 ) is 600 mm. The stress amplitude was 45 ± 15 kgf / mm 2 and the displacement was constant.
上表において、芯材長さが600mmの時には従来品（第４
図）と同様に芯材長さがテーパ部の全長600mmと一致す
るため、樹脂部分５は実質的に存在しない。芯材長さが
540mmの場合は、樹脂部分５の長さは両側で合計60mmと
なり、片側30mmとなる。 In the above table, when the core material length is 600 mm,
As shown in the drawing), the length of the core material coincides with the total length of the taper portion of 600 mm, so that the resin portion 5 does not substantially exist. The core length is
In the case of 540 mm, the length of the resin portion 5 is 60 mm in total on both sides and 30 mm on one side.
樹脂部分５の長さは長過ぎても短か過ぎても良くない。
上表の例から、芯材長さはテーパ部の全長600mmに対し
て、500〜540mmが適当である。しかし厳密に言うと、芯
材長さが500mmの時には折損回数が1.0万回という低い結
果も混じっているから、望ましくは芯材長さは540mm付
近、すなわちテーパ部全長の90％付近とするのがよい。
芯材３の材質と成形方法は問わないが、一方向連続強化
繊維とマトリックス樹脂で成形したFRP製の芯材が最も
耐久性に優れていた。The length of the resin portion 5 may be too long or too short.
From the example in the above table, it is appropriate that the core material length is 500 to 540 mm with respect to the total length of the taper portion of 600 mm. Strictly speaking, however, when the core material length is 500 mm, the number of breakages is as low as 10 000 times, which is a mixed result, so the core material length is preferably around 540 mm, that is, around 90% of the total length of the taper part. Is good.
The material of the core material 3 and the molding method are not limited, but the core material made of FRP molded with the unidirectional continuous reinforcing fibers and the matrix resin has the highest durability.
なお第３図に示された実施例のように、芯材３の端面４
の形状を厚み方向に円弧または円弧に近い曲面に仕上げ
てもよい。この場合、端面４に角部が無くなるため更に
良い結果が期待できる。As in the embodiment shown in FIG. 3, the end surface 4 of the core material 3 is
The shape may be finished into an arc or a curved surface close to an arc in the thickness direction. In this case, a better result can be expected because the end face 4 has no corners.
本発明によれば、芯材を用いることにより長手方向に板
厚の変化する部分を形成するようにしたFRPテーパ板ば
ねにおいて、芯材の長さあるいは芯材端部の形状を従来
品と異ならせ、特許請求の範囲に記載した長さの樹脂部
分を芯材の端からテーパ部の端まで設けるという比較的
簡単な対策によって、芯材を有するFRPテーパ板ばねが
芯材の端部付近で破壊することを回避でき、FRPテーパ
板ばねの耐久性を大幅に向上させることができる。According to the present invention, in the FRP taper leaf spring in which the core member is used to form the portion where the plate thickness varies in the longitudinal direction, the length of the core member or the shape of the end of the core member is different from the conventional product. The FRP taper leaf spring having the core material is provided in the vicinity of the end portion of the core material by a relatively simple measure of providing the resin portion having the length described in the claims from the end of the core material to the end of the taper portion. It is possible to avoid breakage and greatly improve the durability of the FRP taper leaf spring.
第１図は本発明の一実施例を示すFRPテーパ板ばねの断
面図、第２図は第１図に示された板ばねの端部の拡大断
面図、第３図は本発明の他の実施例を示すFRPテーパ板
ばねの端部の断面図、第４図は従来のテーパ板ばねを示
す断面図である。 １……FRPテーパ板ばね、２……FRP材、３……芯材。1 is a sectional view of an FRP taper leaf spring showing an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an end portion of the leaf spring shown in FIG. 1, and FIG. FIG. 4 is a sectional view of an end portion of a FRP taper leaf spring showing an embodiment, and FIG. 4 is a sectional view showing a conventional taper leaf spring. 1 ... FRP taper leaf spring, 2 ... FRP material, 3 ... core material.
Claims (2)
P材の内部に、両端側の厚みがそれぞれテーパ状に漸減
する帯状の芯材を埋設することによって長手方向中央か
ら両端に向って板厚が減少するテーパ部を形成するよう
にしたFRPテーパ板ばねにおいて、 上記芯材が上記テーパ部よりも短くなるように上記芯材
の長さをテーパ部の長さ600mm当たり500〜540mmとし、
かつ、上記芯材の両端の長手方向延長線上に、上記マト
リックス樹脂のみを硬化させた樹脂部分を上記芯材の端
からテーパ部の端まで設けたことを特徴とするFRPテー
パ板ばね。1. A FR comprising a matrix resin and a reinforcing fiber.
An FRP taper plate is formed by embedding a strip-shaped core material in which the thickness at both ends gradually decreases in the inside of the P material to reduce the thickness from the longitudinal center toward both ends. In the spring, the length of the core material is 500 to 540 mm per 600 mm of the length of the tapered portion so that the core material is shorter than the tapered portion,
Further, the FRP taper leaf spring is characterized in that a resin portion obtained by curing only the matrix resin is provided from the end of the core material to the end of the taper portion on extension lines in the longitudinal direction of both ends of the core material.
円弧状に形成されていることを特徴とする特許請求の範
囲第１項記載のFRPテーパ板ばね。2. The FRP taper leaf spring according to claim 1, wherein an end face in the longitudinal direction of the core member is formed in an arc shape in the thickness direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61267087A JPH0745889B2 (en) | 1986-11-10 | 1986-11-10 | FRP taper leaf spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61267087A JPH0745889B2 (en) | 1986-11-10 | 1986-11-10 | FRP taper leaf spring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63120925A JPS63120925A (en) | 1988-05-25 |
| JPH0745889B2 true JPH0745889B2 (en) | 1995-05-17 |
Family
ID=17439860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61267087A Expired - Lifetime JPH0745889B2 (en) | 1986-11-10 | 1986-11-10 | FRP taper leaf spring |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0745889B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9428199B2 (en) | 2011-09-15 | 2016-08-30 | Gh Craft Ltd. | Railcar bogie plate spring |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2015012227A (en) * | 2013-03-15 | 2016-05-18 | Gordon Holdings Inc | High strength, light weight composite leaf spring and method of making. |
| US9657799B2 (en) | 2013-03-15 | 2017-05-23 | Polyone Corporation | Suspension sub-assembly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5814936B2 (en) * | 1979-10-05 | 1983-03-23 | 加藤発条株式会社 | Manufacturing method for fiber-reinforced resin leaf springs |
| JPS5732917A (en) * | 1980-08-07 | 1982-02-22 | Toyota Motor Corp | Manufacture of fiber-reinforced plastic leaf spring |
-
1986
- 1986-11-10 JP JP61267087A patent/JPH0745889B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9428199B2 (en) | 2011-09-15 | 2016-08-30 | Gh Craft Ltd. | Railcar bogie plate spring |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63120925A (en) | 1988-05-25 |
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