JPS6325206B2 - - Google Patents
Info
- Publication number
- JPS6325206B2 JPS6325206B2 JP55155643A JP15564380A JPS6325206B2 JP S6325206 B2 JPS6325206 B2 JP S6325206B2 JP 55155643 A JP55155643 A JP 55155643A JP 15564380 A JP15564380 A JP 15564380A JP S6325206 B2 JPS6325206 B2 JP S6325206B2
- Authority
- JP
- Japan
- Prior art keywords
- rod
- pin hole
- piston pin
- small end
- fiber
- 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
Links
Landscapes
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Description
本発明は、内燃機関用コンロツド、特に桿部
と、その桿部の両端に連なる小端部及び大端部と
より構成されて全体を鋳造され、前記小端部の、
ピストンピン孔の周囲及び前記桿部には、一方向
繊維束と該繊維束に前記鋳造時に充填複合される
マトリツクスとよりなる繊維強化複合部が形成さ
れてなる構造のコンロツドに関する。
上記コンロツドはその桿部及び小端部のピスト
ンピン孔周壁の剛性を繊維強化複合部により効果
的に高めることができるという利点を有している
が、桿部及び小端部を特に全体的に繊維強化する
場合には強化繊維の使用量が著しく多くなつてコ
ストが嵩むという問題があり、またその一部、例
えばピストンピン孔軸線方向の中央部だけを繊維
強化する場合には、一方向繊維束を鋳型内の定位
置にセツトする作業が容易でない上、次のような
問題が生じる。即ち、小端部のピストンピン孔周
壁部は、その軸線方向中央部の繊維強化複合部と
その両側部との間に大きな剛性差を生じるので、
その中央繊維強化複合部を支点として機関圧縮行
程時にピストンピンが多少撓む傾向となり、その
結果ピストンピン孔の両開口縁に過大な荷重が作
用して両開口縁にチツピング、クラツク等を発生
し、疲労破損を惹起するおそれがある。
本発明は上記に鑑み提案されたもので、小端部
及び桿部の、ピストンピン孔軸線方向の各中央部
を繊維強化しても上記問題のない、有用な内燃機
関用コンロツドを提供することを目的とする。
そして上記目的を達成するために本発明は、桿
部と、その桿部の両端に連なる小端部及び大端部
とより構成されて全体を鋳造され、前記小端部
の、ピストンピン孔の周囲及び前記桿部には、一
方向繊維束と該繊維束に前記鋳造時に充填複合さ
れるマトリツクスとよりなる繊維強化複合部が形
成されてなる、内燃機関用コンロツドにおいて、
前記繊維強化複合部が、前記桿部及び小端部の、
ピストンピン孔軸線方向の各中央部に配設される
と共に、桿部におけるマトリツクス単体部の両外
側面より外方に突出して、桿部の長手方向にのび
る補強リブを形成し、さらに前記小端部のピスト
ンピン孔軸線方向の幅Ｌと前記ピストンピン孔の
内径Ｄとの関係がＬ／Ｄ＝1.10〜1.35に、また前
記ピストンピン孔の両開口縁の面取り深さＲの和
が前記幅Ｌの10〜25％にそれぞれ設定されること
を特徴とする。
以下、図面により本発明の一実施例について説
明すると、コンロツドは桿部１と、その両端に連
なる大端部２及び小端部３とより構成され、小端
部３にピストンピン孔４が穿設される。小端部３
の、ピストンピン孔４の周囲及び桿部１には、互
いに並列する一対の一方向繊維束Ｆ，Ｆと、該繊
維束Ｆ，Ｆにコンロツド鋳造時に充填複合される
マトリツクスとよりなる繊維強化複合部Ｃが形成
され、両一方向繊維束Ｆ，Ｆは小端部３において
ピストンピン孔４の周囲に広がるように二叉状に
分岐している。前記繊維強化複合部Ｃは、第２，
３図に明示するように桿部１及び小端部３の、ピ
ストンピン孔４軸線方向の各中央部にのみ配設さ
れており、しかも桿部１におけるマトリツクス単
体部Ｍの両外側面１ａ，１ａより外方に突出し
て、桿部１長手方向にのびる補強リブｌ，ｌを形
成している。
ピストンピン孔４の両開口縁には、それぞれ面
取り部５が形成され、その形状はピストンピン孔
４の直線部とスムーズに連続させるため円弧面に
形成される。両面取り部５の深さ、即ち半径Ｒの
和は、小端部３のピストンピン孔４軸線方向の幅
Ｌと、ピストンピン孔４の内径Ｄとの関係をＬ／
Ｄ＝1.0〜1.35とした場合、該幅Ｌの10〜25％と
設定される。
マトリツクスとしては、例えばアルミニウム合
金を用い、高圧凝固鋳造法によりマトリツクスを
一方向繊維束Ｆに充填、複合すると同時にコンロ
ツドを鋳造する。而してこの鋳造に際し、鋳型
の、桿部に対応するキヤビテイには前記補強リブ
ｌ，ｌに対応する凹条部が形成されるので、この
凹条部を利用すれば一方向繊維束Ｆ，Ｆのキヤビ
テイ内への位置決め固定が比較的容易である。
下表は面取り部５の深さＲを種々変更したコン
ロツドＩ〜を鋳造し、それらを排気量1.5の
機関に組込み、機関回転数5.000rpmで200時間、
全負荷運転をした、耐久テストの結果を示す。
なお、前記幅Ｌ＝21.8mm、ピストンピン孔の内
径Ｄ＝17mmである。
The present invention relates to a connecting rod for an internal combustion engine, and in particular, the connecting rod is composed of a rod portion, a small end portion and a large end portion connected to both ends of the rod portion, and is entirely cast, and the small end portion includes:
The present invention relates to a connecting rod having a structure in which a fiber-reinforced composite portion consisting of a unidirectional fiber bundle and a matrix filled and composited into the fiber bundle during casting is formed around the piston pin hole and in the rod portion. The above-mentioned connecting rod has the advantage that the rigidity of the peripheral wall of the piston pin hole in the rod portion and the small end can be effectively increased by the fiber-reinforced composite portion, but the rod portion and the small end portion are particularly When reinforcing fibers, there is a problem that the amount of reinforcing fibers used increases significantly, which increases costs.Also, when reinforcing only a part of the reinforcing fibers, for example, the central part in the axial direction of the piston pin hole, it is necessary to use unidirectional fibers. It is not easy to set the bundle in a fixed position in the mold, and the following problems arise. That is, the piston pin hole peripheral wall portion at the small end has a large rigidity difference between the fiber-reinforced composite portion at the axial center portion and both side portions thereof.
The piston pin tends to bend somewhat during the engine compression stroke using the central fiber-reinforced composite part as a fulcrum, and as a result, an excessive load acts on both opening edges of the piston pin hole, causing chipping, cracking, etc. at both opening edges. , there is a risk of causing fatigue damage. The present invention has been proposed in view of the above, and an object of the present invention is to provide a useful connecting rod for an internal combustion engine that does not have the above-mentioned problems even when the small end portion and the rod portion are reinforced with fibers at each central portion in the axial direction of the piston pin hole. With the goal. In order to achieve the above object, the present invention consists of a rod portion, a small end portion and a large end portion continuous to both ends of the rod portion, and is cast as a whole, and the piston pin hole of the small end portion is formed by casting. A connecting rod for an internal combustion engine, in which a fiber-reinforced composite part consisting of a unidirectional fiber bundle and a matrix filled and composited into the fiber bundle during casting is formed around the periphery and the rod part,
The fiber-reinforced composite portion includes the rod portion and the small end portion.
A reinforcing rib is provided at each central portion in the axial direction of the piston pin hole, protrudes outward from both outer surfaces of the single matrix portion in the rod portion, and extends in the longitudinal direction of the rod portion. The relationship between the width L in the axial direction of the piston pin hole and the inner diameter D of the piston pin hole is L/D = 1.10 to 1.35, and the sum of the chamfer depth R of both opening edges of the piston pin hole is the width It is characterized by being set at 10 to 25% of L. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. The connecting rod is composed of a rod portion 1, a large end portion 2 and a small end portion 3 continuous to both ends thereof, and a piston pin hole 4 is bored in the small end portion 3. will be established. Small end 3
Around the piston pin hole 4 and around the rod part 1, there is a fiber-reinforced composite consisting of a pair of unidirectional fiber bundles F, F that are parallel to each other, and a matrix that is filled and composited into the fiber bundles F, F when casting the connecting rod. A portion C is formed, and both unidirectional fiber bundles F, F are branched into a bifurcated shape so as to spread around the piston pin hole 4 at the small end portion 3. The fiber-reinforced composite portion C includes a second,
As clearly shown in FIG. 3, they are provided only at the center portions of the rod portion 1 and the small end portion 3 in the axial direction of the piston pin hole 4, and moreover, on both outer surfaces 1a of the matrix unit M in the rod portion 1, Reinforcing ribs 1, 1 are formed that protrude outward from 1a and extend in the longitudinal direction of the rod portion 1. A chamfered portion 5 is formed on each opening edge of the piston pin hole 4, and the chamfered portion 5 is formed into an arcuate surface so as to smoothly connect with the straight portion of the piston pin hole 4. The depth of the double-sided chamfered portion 5, that is, the sum of the radius R, is determined by the relationship between the width L in the axial direction of the piston pin hole 4 of the small end portion 3 and the inner diameter D of the piston pin hole 4.
When D=1.0 to 1.35, it is set to 10 to 25% of the width L. For example, an aluminum alloy is used as the matrix, and the unidirectional fiber bundle F is filled with the matrix by high-pressure solidification casting and composited, and at the same time, the connecting rod is cast. During this casting, grooves corresponding to the reinforcing ribs 1, 1 are formed in the cavity of the mold corresponding to the rod portions, so if these grooves are used, the unidirectional fiber bundles F, It is relatively easy to position and fix F in the cavity. The table below shows the casting of connecting rods I~ with various depths R of the chamfered part 5, which were assembled into an engine with a displacement of 1.5, and the engine speed was 5.000 rpm for 200 hours.
The results of a durability test with full load operation are shown. Note that the width L is 21.8 mm, and the inner diameter D of the piston pin hole is 17 mm.
【表】
上表から明らかなように、本発明の条件を満た
すコンロツドおよびは、何等異常を発生しな
いが、両面取り部５の割合が10％を下回ると、ピ
ストンピンの撓みを吸収しきれず、面取り部５に
チツピング、クラツク等が発生し、一方両面取り
部５の割合が25％を上回ると、ピストンピン孔４
の直線部が短くなるため、ピストンピン孔４の内
周面の擦過、たたかれ、クリープ等が発生する。
なお、本発明は主としてピストンピンをピスト
ンピン孔に緊密に嵌着するタイプのコンロツドに
適応されるが、ピストンピンをルーズに嵌合する
タイプのものにも有効である。
以上のように本発明によれば、桿部と、その桿
部の両端に連なる小端部及び大端部とより構成さ
れて全体を鋳造され、前記小端部の、ピストンピ
ン孔の周囲及び前記桿部には、一方向繊維束と該
繊維束に前記鋳造時に充填複合されるマトリツク
スとよりなる繊維強化複合部が形成されてなる、
内燃機関用コンロツドにおいて、前記繊維強化複
合部は、前記桿部及び小端部の、ピストンピン孔
軸線方向の各中央部に配設されると共に、桿部に
おけるマトリツクス単体部の両外側面より外方に
突出して、桿部の長手方向にのびる補強リブを形
成するので、桿部及び小端部のピストンピン孔周
囲を効率よく繊維強化することができ、しかも桿
部及び小端部を全体的に繊維強化するものに比べ
て強化繊維の使用量を少なくしてコストの低減に
寄与することができ、しかもまたコンロツド鋳造
型の、桿部に対応するキヤビテイには、前記補強
リブに対応する凹条部が必然的に形成されること
から、この凹条部を利用して一方向繊維束の該キ
ヤビテイ内への位置決め固定を容易に行うことが
できる。
また上記構成により小端部のピストンピン孔周
壁部の、軸線方向中央部（繊維強化複合部）とそ
の両側部との間に大きな剛性差が生じ、その中央
部を支点としてピストンピンが多少撓んでも本発
明では、前記小端部のピストンピン孔軸線方向の
幅Ｌと前記ピストンピン孔の内径Ｄとの関係が
Ｌ／Ｄ＝1.10〜1.35に、また前記ピストンピン孔
の両開口縁の面取り深さＲの和が前記幅Ｌの10〜
25％にそれぞれ設定されるので、ピストンピン孔
の両開口縁におけるチツピング、クラツク等の発
生を防止して、小端部の疲労破損を抑えることが
できる。[Table] As is clear from the above table, connecting rods that meet the conditions of the present invention do not cause any abnormality, but when the ratio of the double-sided chamfered portion 5 is less than 10%, the deflection of the piston pin cannot be fully absorbed. If chipping, cracking, etc. occur in the chamfered portion 5, and the ratio of the double-sided chamfered portion 5 exceeds 25%, the piston pin hole 4
Since the straight portion of the piston pin hole 4 becomes short, scratches, knocks, creep, etc. occur on the inner circumferential surface of the piston pin hole 4. Although the present invention is mainly applied to connecting rods in which the piston pin is tightly fitted into the piston pin hole, it is also effective for connecting rods in which the piston pin is loosely fitted. As described above, according to the present invention, the entire structure is made up of a rod, a small end and a large end connected to both ends of the rod, and the small end is formed around the piston pin hole and A fiber-reinforced composite part is formed in the rod part, and is made of a unidirectional fiber bundle and a matrix that is filled and composited into the fiber bundle during the casting.
In the connecting rod for an internal combustion engine, the fiber-reinforced composite portion is disposed at each central portion of the rod portion and the small end portion in the axial direction of the piston pin hole, and is located outside both outer surfaces of the single matrix portion in the rod portion. Since reinforcing ribs are formed that protrude in the opposite direction and extend in the longitudinal direction of the rod, the area around the piston pin hole in the rod and small end can be efficiently reinforced with fibers, and the rod and small end can be reinforced with fibers as a whole. This can contribute to cost reduction by reducing the amount of reinforcing fibers used compared to those that are reinforced with fibers.Moreover, the cavity corresponding to the rod part of the connecting rod casting mold has recesses corresponding to the reinforcing ribs. Since the stripes are necessarily formed, the unidirectional fiber bundle can be easily positioned and fixed in the cavity by using the grooves. Furthermore, due to the above configuration, a large difference in rigidity occurs between the axial center part (fiber-reinforced composite part) and both sides of the piston pin hole peripheral wall at the small end, and the piston pin is slightly bent around the center part as a fulcrum. However, in the present invention, the relationship between the width L of the small end in the axial direction of the piston pin hole and the inner diameter D of the piston pin hole is L/D=1.10 to 1.35, and The sum of the chamfer depth R is 10~ of the width L.
Since each is set at 25%, it is possible to prevent chipping, cracking, etc. from occurring at both opening edges of the piston pin hole, and to suppress fatigue damage at the small end.
第１図は本発明の一実施例の正面図、第２図は
第１図−線断面図、第３図は第１図−線
断面図である。
Ｃ……繊維強化複合部、Ｄ……ピストンピン孔
の内径、Ｆ……一方向繊維束、Ｌ……幅、ｌ……
補強リブ、Ｍ……マトリツクス単体部、Ｒ……面
取り深さ、１……桿部、１ａ……外側面、２……
大端部、３……小端部、４……ピストンピン孔、
５……面取り部。
1 is a front view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. 3 is a sectional view taken along the line of FIG. 1. C...Fiber-reinforced composite part, D...Inner diameter of piston pin hole, F...Unidirectional fiber bundle, L...Width, l...
Reinforcement rib, M... Matrix single part, R... Chamfer depth, 1... Rod part, 1a... Outer surface, 2...
Big end, 3... Small end, 4... Piston pin hole,
5... Chamfered portion.
Claims (1)
大端部とより構成されて全体を鋳造され、前記小
端部の、ピストンピン孔の周囲及び前記桿部に
は、一方向繊維束と該繊維束に前記鋳造時に充填
複合されるマトリツクスとよりなる繊維強化複合
部が形成されてなる、内燃機関用コンロツドにお
いて、前記繊維強化複合部は、前記桿部及び小端
部の、ピストンピン孔軸線方向の各中央部に配設
されると共に、桿部におけるマトリツクス単体部
の両外側面より外方に突出して、桿部の長手方向
にのびる補強リブを形成し、さらに前記小端部の
ピストンピン孔軸線方向の幅Ｌと前記ピストンピ
ン孔の内径Ｄとの関係がＬ／Ｄ＝1.10〜1.35に、
また前記ピストンピン孔の両開口縁の面取り深さ
Ｒの和が前記幅Ｌの10〜25％にそれぞれ設定され
ることを特徴とする、内燃機関用コンロツド。1 The entire rod is made up of a rod, and a small end and a large end that are continuous to both ends of the rod, and the small end is coated with unidirectional fibers around the piston pin hole and around the rod. A connecting rod for an internal combustion engine, comprising a fiber-reinforced composite portion comprising a bundle and a matrix filled and composited into the fiber bundle during casting, wherein the fiber-reinforced composite portion is formed on the rod portion and the small end portion of the piston. A reinforcing rib is provided at each central portion in the axial direction of the pin hole, protrudes outward from both outer surfaces of the single matrix portion in the rod portion, and extends in the longitudinal direction of the rod portion. The relationship between the width L in the axial direction of the piston pin hole and the inner diameter D of the piston pin hole is L/D = 1.10 to 1.35,
Further, a connecting rod for an internal combustion engine, wherein the sum of chamfer depths R of both opening edges of the piston pin hole is set to 10 to 25% of the width L, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15564380A JPS5779318A (en) | 1980-11-05 | 1980-11-05 | Connecting rod for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15564380A JPS5779318A (en) | 1980-11-05 | 1980-11-05 | Connecting rod for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5779318A JPS5779318A (en) | 1982-05-18 |
| JPS6325206B2 true JPS6325206B2 (en) | 1988-05-24 |
Family
ID=15610449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15564380A Granted JPS5779318A (en) | 1980-11-05 | 1980-11-05 | Connecting rod for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5779318A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61294210A (en) * | 1985-06-20 | 1986-12-25 | Tokyo Keiki Co Ltd | Power transfer device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55147527U (en) * | 1979-04-12 | 1980-10-23 |
-
1980
- 1980-11-05 JP JP15564380A patent/JPS5779318A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5779318A (en) | 1982-05-18 |
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