JPH0121366B2 - - Google Patents
Info
- Publication number
- JPH0121366B2 JPH0121366B2 JP55155641A JP15564180A JPH0121366B2 JP H0121366 B2 JPH0121366 B2 JP H0121366B2 JP 55155641 A JP55155641 A JP 55155641A JP 15564180 A JP15564180 A JP 15564180A JP H0121366 B2 JPH0121366 B2 JP H0121366B2
- Authority
- JP
- Japan
- Prior art keywords
- fiber bundle
- unidirectional fiber
- large end
- sectional area
- cross
- 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に関する。
本発明者等は、先にこの種コンロツドとして、
一方向無機質繊維を所定本数束ねて一方向繊維束
を形成し、その一方向繊維束を所定の長さに切断
して、それを大端と小端とを連結する桿部の軸線
方向に配設すると共にその一方向繊維束にマトリ
ツクスとしての軽合金を充填、複合して桿部を繊
維強化したコンロツドを提案した。
本発明者等は、上記コンロツドについて種々検
討を加えた結果、一方向繊維束の大端側端部が切
り揃えられ、一様平坦な切り口面を有するため、
一方向繊維束端部とマトリツクスとの接合強度が
低下する傾向にあり、またこの一方向繊維束端部
を境として桿部側と大端側とに大きなに剛性差を
生じ、桿部の大端側端部と大端との境界部周縁に
応力集中が発生することを究明した。
本発明は上記の点に鑑み提案されたもので、強
度的にバランスのとれた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、大
端と小端とを連結する桿部に、その軸線方向にの
びる一方向繊維束を配設すると共に、その一方向
繊維束にマトリツクスとしての軽合金を充填、複
合して前記桿部を繊維強化した内燃機関用コンロ
ツドにおいて、前記大端の、頂部が前記桿部に連
続するマトリツクス単体よりなる山形部に、前記
一方向繊維束の大端側端部の全周端縁を埋入させ
て、前記桿部の大端側端部の断面積Ａと、前記一
方向繊維束の大端側端部の切り口断面積Afと、
前記桿部の最小断面積Acとの関係を、
Ａ／Af＋Ac＞1.2
に設定したことを特徴とする。
以下、図面により本発明の一実施例について説
明すると、１は、大端２および小端３を一体に連
結する桿部で、それには一方向繊維束Ｆが該桿部
１の軸線方向に配設される。一方向繊維束Ｆの大
端側端部Faは一様平坦な切り口面（断面積Af）
を有し、一方小端側端部Fbは二股状に形成され、
ピストンピン孔４の周壁をも繊維強化する。
上記切り口断面積Afは総繊維断面に略等しく
なる。
桿部１の大端側端部の断面積Ａと、一方向繊維
束Ｆの大端側端部の断面積Afと、桿部１の最小
断面積Acとの関係は、
Ａ／Af＋Ac＞1.2
と設定され、そのために第１図からも明らかなよ
うに大端２の、頂部が桿部１に連続する山形部２
ａに、一方向繊維束Ｆの大端側端部の全周端縁ｅ
を埋入させている。第１図においてｌは小端３の
ピストンピン孔４の中心から桿部１の大端側端部
までの長さ（mm）を示す。
下表は直径28.5μのステンレス繊維（JIS記号
SUS 304）を64000本用いて一方向繊維束Ｆを形
成し、これにマトリツクスＭとしてアルミニウム
合金を高圧凝固鋳造法により充填、複合させると
共に桿部１の大端側端部の断面積Ａ（mm2）および
長さｌを種々変更して鋳造されたコンロツド〜
のテストを結果を示す。
なお、桿部１の最小断面積Ac＝205.4mm2、一方
向繊維束Ｆの大端側端部の切り口断面積Af＝33.4
mm2であり、したがつてAf＋Ac＝238.8mm2である。
静的曲げ破損テストとは、機関運転時コンロツド
に実際に作用する曲げ荷重以上の過大な曲げ荷重
を与えて、どこが破損するかを見出すテストであ
り、また耐久テストとは、コンロツドを排気量
1.5の機関に組込み、機関回転数5000rpmで200
時間、全負荷運転を行うテストである。
The present invention relates to a connecting rod for an internal combustion engine. The present inventors previously developed this kind of stove,
A predetermined number of unidirectional inorganic fibers are bundled to form a unidirectional fiber bundle, the unidirectional fiber bundle is cut to a predetermined length, and the unidirectional fiber bundle is arranged in the axial direction of the rod connecting the large end and the small end. At the same time, we proposed a connecting rod in which the unidirectional fiber bundle was filled with a light alloy as a matrix, composited, and the rod portion was reinforced with fibers. The present inventors conducted various studies on the connecting rod, and found that the large end of the unidirectional fiber bundle is trimmed and has a uniformly flat cut surface.
The bonding strength between the end of the unidirectional fiber bundle and the matrix tends to decrease, and there is a large difference in rigidity between the rod side and the large end side at the end of the unidirectional fiber bundle. It was found that stress concentration occurs around the boundary between the end side edge and the large end. The present invention has been proposed in view of the above points, and an object of the present invention is to provide a cooking stove with balanced strength. In order to achieve the above object, the present invention provides a unidirectional fiber bundle extending in the axial direction of the rod connecting the large end and the small end, and a light matrix as a matrix in the unidirectional fiber bundle. In the connecting rod for an internal combustion engine in which the rod portion is fiber-reinforced by filling and compounding an alloy, the large end side of the unidirectional fiber bundle is attached to the chevron portion of the large end, which is made of a single matrix whose top portion is continuous with the rod portion. A cross-sectional area A of the large-end side end of the rod portion by embedding the entire circumferential edge of the end portion, and a cut cross-sectional area Af of the large-end side end of the unidirectional fiber bundle;
The present invention is characterized in that the relationship between the rod portion and the minimum cross-sectional area Ac is set to A/Af+Ac>1.2. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a rod portion that integrally connects a large end 2 and a small end 3, and a unidirectional fiber bundle F is arranged in the axial direction of the rod portion 1. will be established. The large end Fa of the unidirectional fiber bundle F is a uniformly flat cut surface (cross-sectional area Af)
On the other hand, the small end side end Fb is formed into a bifurcated shape,
The peripheral wall of the piston pin hole 4 is also reinforced with fibers. The cut cross-sectional area Af is approximately equal to the total fiber cross-section. The relationship between the cross-sectional area A of the large end of the rod 1, the cross-sectional area Af of the large end of the unidirectional fiber bundle F, and the minimum cross-sectional area Ac of the rod 1 is A/Af+Ac>1.2 Therefore, as is clear from FIG.
In a, the entire circumferential edge e of the large end side end of the unidirectional fiber bundle F
is embedded. In FIG. 1, l indicates the length (mm) from the center of the piston pin hole 4 of the small end 3 to the end of the rod portion 1 on the large end side. The table below shows stainless steel fibers with a diameter of 28.5μ (JIS symbol
A unidirectional fiber bundle F is formed using 64,000 pieces of SUS 304), and this is filled with an aluminum alloy as a matrix M by high-pressure solidification casting and composited, and the cross-sectional area A (mm 2 ) Conn rods cast with various lengths l~
Show the results of the test. In addition, the minimum cross-sectional area Ac of the rod portion 1 is 205.4 mm 2 , and the cross-sectional area Af of the large end of the unidirectional fiber bundle F is 33.4.
mm 2 and therefore Af+Ac=238.8mm 2 .
A static bending damage test is a test in which an excessive bending load greater than the bending load that actually acts on the conrod during engine operation is used to find out where the conrod will break.
Built into a 1.5 engine, the engine speed is 200 rpm at 5000 rpm.
This is a test that performs full load operation for a certain period of time.
【表】
上記テスト結果から明らかなように、Ａ／
（Af＋Ac）≧1.8であることが好ましいが、この値
が1.2を越えれば、十分に実用に耐えるコンロツ
ドが得られるものである。
以上のように本発明によれば、大端と小端とを
連結する桿部に、その軸線方向にのびる一方向繊
維束を配設すると共に、その一方向繊維束にマト
リツクスとしての軽合金を充填、複合して前記桿
部を繊維強化した内燃機関用コンロツドにおい
て、前記大端の、頂部が前記桿部に連続するマト
リツクス単体よりなる山形部に、前記一方向繊維
束の大端側端部の全周端縁を埋入させて、前記桿
部の大端側端部の断面積Ａと、前記一方向繊維束
の大端側端部の切り口断面積Afと、前記桿部の
最小断面積Acとの関係を、
Ａ／Af＋Ac＞1.2
に設定したので、桿部の危険断面の強化はもとよ
り、桿部の大端側端部における一方向繊維束とマ
トリツクスとの接合強度の向上に寄与することが
でき、のみならず一方向繊維束端部を境とする桿
部側と大端側との剛性差をその全周に亘り可及的
に小さくして、桿部と大端との境界部周縁におけ
る応力集中を軽減することができ、従つて強度欠
陥のない、バランスのとれたコンロツドを得るこ
とができる。[Table] As is clear from the above test results, A/
It is preferable that (Af+Ac)≧1.8, but if this value exceeds 1.2, a connecting rod that can be used in practical use can be obtained. As described above, according to the present invention, a unidirectional fiber bundle extending in the axial direction is disposed in the rod portion connecting the large end and the small end, and a light alloy as a matrix is provided in the unidirectional fiber bundle. In the connecting rod for an internal combustion engine in which the rod portion is fiber-reinforced by filling and compounding, the large end side end portion of the unidirectional fiber bundle is attached to the chevron portion of the large end, which is made of a single matrix whose apex is continuous with the rod portion. , and the cross-sectional area A of the large end of the rod, the cross-sectional area Af of the large end of the unidirectional fiber bundle, and the minimum cross-section of the rod. Since the relationship with the area Ac is set to A/Af+Ac>1.2, it not only strengthens the dangerous cross section of the rod but also contributes to improving the bonding strength between the unidirectional fiber bundle and the matrix at the large end of the rod. Not only that, but the difference in rigidity between the rod side and the big end side bordering on the end of the unidirectional fiber bundle is made as small as possible over the entire circumference, and the difference in rigidity between the rod side and the big end side is Stress concentration at the periphery of the boundary can be reduced, and a well-balanced connecting rod without any strength defects can therefore be obtained.
第１図は本発明の一実施例の縦断正面図、第２
図は第１図―線断面図である。
１…桿部、２…大端、２ａ…山形部、３…小
端、５…山形部、Ｆ…一方向繊維束、Ｍ…マトリ
ツクス、Ａ…桿部の大端側端部の断面積、Af…
一方向繊維束の大端側端部の切り口断面積、Ac
…桿部の最小断面積、ｅ…端縁。
FIG. 1 is a longitudinal sectional front view of one embodiment of the present invention, and FIG.
The figure is a sectional view taken along the line of FIG. 1... Rod part, 2... Big end, 2a... Chevron part, 3... Small end, 5... Chevron part, F... Unidirectional fiber bundle, M... Matrix, A... Cross-sectional area of the large end side end of the rod part. Af…
The cross-sectional area of the large end of the unidirectional fiber bundle, Ac
...Minimum cross-sectional area of the rod, e...edge.
Claims (1)
向にのびる一方向繊維束を配設すると共に、その
一方向繊維束にマトリツクスとしての軽合金を充
填、複合して前記桿部を繊維強化した内燃機関用
コンロツドにおいて、前記大端の、頂部が前記桿
部に連続するマトリツクス単体よりなる山形部
に、前記一方向繊維束の大端側端部の全周端縁を
埋入させて、前記桿部の大端側端部の断面積Ａ
と、前記一方向繊維束の大端側端部の切り口断面
積Afと、前記桿部の最小断面積Acとの関係を、 Ａ／Af＋Ac＞1.2 に設定したことを特徴とする、内燃機関用コンロ
ツド。[Claims] 1. A unidirectional fiber bundle extending in the axial direction is arranged in the rod portion connecting the large end and the small end, and the unidirectional fiber bundle is filled with a light alloy as a matrix to form a composite. In the conrod for an internal combustion engine in which the rod portion is reinforced with fibers, the entire circumference of the large end side end of the unidirectional fiber bundle is attached to the chevron portion of the large end, which is made up of a single matrix whose apex is continuous with the rod portion. By embedding the end edge, the cross-sectional area A of the large end side end of the rod portion
and the relationship between the cross-sectional area Af of the large end of the unidirectional fiber bundle and the minimum cross-sectional area Ac of the rod portion is set to A/Af+Ac>1.2. Conrod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15564180A JPS5779316A (en) | 1980-11-05 | 1980-11-05 | Connecting rod for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15564180A JPS5779316A (en) | 1980-11-05 | 1980-11-05 | Connecting rod for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5779316A JPS5779316A (en) | 1982-05-18 |
| JPH0121366B2 true JPH0121366B2 (en) | 1989-04-20 |
Family
ID=15610407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15564180A Granted JPS5779316A (en) | 1980-11-05 | 1980-11-05 | Connecting rod for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5779316A (en) |
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 JP15564180A patent/JPS5779316A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5779316A (en) | 1982-05-18 |
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