JPS5828446B2 - Cast engine crankshaft - Google Patents
Cast engine crankshaftInfo
- Publication number
- JPS5828446B2 JPS5828446B2 JP14737180A JP14737180A JPS5828446B2 JP S5828446 B2 JPS5828446 B2 JP S5828446B2 JP 14737180 A JP14737180 A JP 14737180A JP 14737180 A JP14737180 A JP 14737180A JP S5828446 B2 JPS5828446 B2 JP S5828446B2
- Authority
- JP
- Japan
- Prior art keywords
- pin
- engine crankshaft
- recessed
- axis
- crankshaft
- 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
【発明の詳細な説明】
本発明は、ピン部とクランクウェブの連結箇所のうち軸
回転中心に近い部分に近接させた状態で前記ウェブ面に
凹入部を設けて、前記連結箇所に対する応力集中の緩和
によって疲労強度を向上させると共に、前記ピン部にそ
れの軸芯方向に貫通する中空部を設けて、そのピン部の
捩り疲労強度を向上させるようにした鋳造製クランク軸
に関し、簡単な改造によって、強度的に有利でかつ軽量
のクランク軸を製造容易に得られるようにする事を目的
とする。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a concave portion in the web surface in close proximity to a portion of the connecting portion between the pin portion and the crank web that is close to the shaft rotation center, thereby reducing stress concentration on the connecting portion. Regarding a cast crankshaft, which improves fatigue strength by relaxation and also improves torsional fatigue strength of the pin by providing a hollow part penetrating the pin in the axial direction, it is possible to improve the torsional fatigue strength of the pin by simple modification. The purpose of this invention is to make it possible to easily manufacture a crankshaft that is advantageous in terms of strength and lightweight.
次に、本発明の実施の態様を例示図に基いて詳述する。Next, embodiments of the present invention will be described in detail based on illustrative drawings.
クランク軸芯と同芯状のジャーナル部１に２個一対のク
ランクウェブ２，２を連設すると共に、前記一対のウェ
ブ２，２の端部をピン部３で連結し、そして、前記ピン
部３の連結部とは反対側のウェブ角部ａ、ａを切除成型
して、それによる重量減少と前記ピン部３による重量増
加の重量差を基にして、クラ／り軸芯まわりの偶方を釣
合せるために前記ウェブ２，２の夫々にバランスウェイ
ト４，４を連設し、かつ、それらを砂鋳型を用いてダク
タイル鋳鉄により一体鋳造して、エンジンクランク軸を
構成しである。A pair of crank webs 2, 2 are arranged in series on a journal part 1 concentric with the crankshaft, and the ends of the pair of webs 2, 2 are connected by a pin part 3, and the pin part The web corner parts a, a on the opposite side from the connection part 3 are cut and molded, and based on the weight difference between the weight reduction due to this and the weight increase due to the pin part 3, the even angle around the joint axis Balance weights 4, 4 are connected to each of the webs 2, 2 in order to balance the above, and these are integrally cast from ductile cast iron using a sand mold to constitute the engine crankshaft.
前記ピン部３とクランクウェブ２の連結箇所において、
その内のクランク軸回転中心に近い部分の前記ピン部３
に近接するウェブ面Ｓに、その箇所に対する応力集中を
緩和させるための凹入部Ａを、かつ、前記ピン部３にそ
れの軸芯方向に貫通するマユ状に近い中空部Ｂを、夫々
クランク軸表面に滑らかに連ねる状態でクランク軸鋳造
と同時に砂鋳型によって成型しである。At the connection point between the pin portion 3 and the crank web 2,
The pin portion 3 of the portion near the center of rotation of the crankshaft
A recessed portion A is provided on the web surface S adjacent to the crankshaft to relieve stress concentration at that location, and a hollow portion B similar to a cocoon-like shape that penetrates through the pin portion 3 in the axial direction thereof is provided on the crankshaft. It is molded using a sand mold at the same time as the crankshaft casting so that it is smooth on the surface.
前記凹入部Ａを形成するに、それが応力集中の緩和に機
能するように、かつ、ウェブ２の強度的限界を勘案して
ウェブ２の危険断面の巾Ｙ−Ｙを小さくしないように、
前記ピン部３の外径りに対する最大凹入部の深さｌの割
合を、０．２ないし０．５の範囲に設定し、そして、そ
の凹入部Ａがピン部３まわりの応力集中の緩和に機能す
るように、かつ、それを鋳造成型する為の砂鋳型が形状
的に複雑にならないように、更には、それを砂中子で成
型する場合に、それの母型に対する遺構性を良好にある
いは中子の崩れ防止を図れるように、その凹入部Ａを、
前記ピン部３の軸芯Ｐを中心にしてそのピン部軸芯Ｐと
ジャーナル軸芯Ｐ１ を結ぶ線Ｑに対して左右振分け３
０度ないし４５度の範囲θに設定しである。In forming the recessed portion A, the width Y-Y of the dangerous cross section of the web 2 is not made small, taking into consideration the strength limit of the web 2, so that it functions to relieve stress concentration.
The ratio of the maximum depth l of the recessed portion to the outer diameter of the pin portion 3 is set in a range of 0.2 to 0.5, and the recessed portion A is used to alleviate stress concentration around the pin portion 3. In order for the sand mold to be functional and to avoid the shape of the sand mold for casting it to be complicated, and furthermore, when molding it with a sand core, it should have good structural stability with respect to the mother mold. Or, to prevent the core from collapsing, the recessed part A
Left and right distribution 3 with respect to a line Q that connects the pin part axis P and the journal axis P1 with the axis P of the pin part 3 as the center.
It is set in the range θ of 0 degrees to 45 degrees.
前記中空部Ｂを形成するに、それが軽量化に大きく機能
し、かつ、同時に捩りの疲労強度を向上しながらもピン
部３自体の設計応力を低下させないように、前記ピン部
３の外径りに対する中空部最大内径ｄの比を、０．５な
いし０．７の範囲に設定しである。When forming the hollow part B, the outer diameter of the pin part 3 is adjusted so that it greatly reduces the weight and simultaneously improves the torsional fatigue strength while not reducing the design stress of the pin part 3 itself. The ratio of the maximum inner diameter d of the hollow portion to the inner diameter d is set in the range of 0.5 to 0.7.
尚、前記クランク軸の鋳造材料として、普通鋳鋼や普通
鋳鉄あるいは特殊鋳鋼や特殊鋳鉄など各種のものを利用
できる。Note that various materials such as ordinary cast steel, ordinary cast iron, special cast steel, and special cast iron can be used as the casting material for the crankshaft.
以上要するに本発明は、官記した鋳造製エンジンクラン
ク軸において、前記凹入部Ａ及び中空部Ｂがエンジンク
ランク軸鋳造に伴って砂鋳型によって同時成型されてお
り、前記凹入部Ａを、前記ピン部３の軸芯Ｐを中心にし
てそのピン部軸芯Ｐとジャーナル軸芯Ｐ１ を結ぶ線Ｑ
に対して左右振分け３０度ないし４５度の範囲で、かつ
、前記ピン部３の外径りに対する前記ウェブ面Ｓからの
深さの割合を０．２ないし０．５の範囲に設定し、前記
ピン部３の外径りに対する前記中空部Ｂの最大内径ｄの
比を０．５ないし０．７の範囲に設定しである事を特徴
とする。In summary, the present invention provides a officially registered cast engine crankshaft in which the recessed part A and the hollow part B are simultaneously molded by a sand mold along with the casting of the engine crankshaft, and the recessed part A is formed in the pin part. A line Q connecting the pin part axis P and the journal axis P1 with the axis P of No. 3 as the center.
, and the ratio of the depth from the web surface S to the outer diameter of the pin portion 3 is set in the range of 0.2 to 0.5. It is characterized in that the ratio of the maximum inner diameter d of the hollow portion B to the outer diameter of the pin portion 3 is set in the range of 0.5 to 0.7.
即ち、疲労強度を向上させるための凹入部Ａ及び中空部
Ｂの形状を上述のように設定するだけの改造でもって、
エンジンクランク軸を強度面で有利な軽量のものにする
事ができるようになり、その上、凹入部Ａ及び中空部Ｂ
を砂鋳型によってクランク軸鋳造と同時に成型するので
、それらを鋳造後に機械加工で成型するに比べて、その
クランク軸を容易に得られるようになった。That is, by simply modifying the shapes of the recessed part A and hollow part B as described above in order to improve fatigue strength,
It is now possible to make the engine crankshaft lightweight and advantageous in terms of strength, and in addition, the recessed part A and hollow part B
The crankshaft is molded using a sand mold at the same time as the crankshaft casting, making it easier to obtain the crankshaft compared to molding them by machining after casting.
図面は本発明に係る鋳造製エンジンクランク軸の実施の
態様を例示し、第１図は要部を破断した全体側面図、第
２図は第１図の■−■線断面図である。
２・・・・・・クランクウェブ、３・・・・・・ピン部
、Ａ・・・・・・凹入部、Ｂ・・・・・・中空部、Ｐ
、 Ｐｌ・・・・・・軸芯、Ｑ・・・・・・線、Ｓ・・
・・・・ウェブ面。The drawings illustrate an embodiment of a cast engine crankshaft according to the present invention, and FIG. 1 is an overall side view with main parts cut away, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1. 2...Crank web, 3...Pin part, A...Recessed part, B...Hollow part, P
, Pl...axis center, Q...line, S...
...Web side.
Claims (1)
転中心に近い部分に近接させた状態で前記ウェブ面Ｓに
凹入部Ａを設けると共に、前記ピン部３にそれの軸芯方
向に貫通する中空部３を設けた鋳造製エンジンクランク
軸であって、前記凹入部Ａ及び中空部Ｂがエンジンクラ
ンク軸鋳造に伴って砂鋳型によって同時成型されており
、前記凹入部Ａを、前記ピン部３の軸芯Ｐを中心にして
そのピン部軸芯Ｐとジャーナル軸芯Ｐ１ を結ぶ線Ｑに
対して左右振分け３０度ないし４５度の範囲で、かつ、
前記ピン部３の外径りに対する前記ウェブ面Ｓかもの深
さの割合を０．２ないし０．５の範囲に設定し、前記ピ
ン部３の外径りに対する前記中空部Ｂの最大内径ｄの比
を０．５ないし０．７の範囲に設定しである事を特徴と
する鋳造製エンジンクランク軸。1. A recessed portion A is provided in the web surface S in a state close to a portion of the connection between the pin portion 3 and the crank web 2 that is close to the shaft rotation center, and the recessed portion A is provided in the pin portion 3 in the axial direction thereof. It is a cast engine crankshaft having a hollow part 3, in which the recessed part A and the hollow part B are simultaneously molded by sand molding together with the casting of the engine crankshaft, and the recessed part A is formed in the pin part 3. in the range of 30 degrees to 45 degrees on the left and right with respect to the line Q connecting the pin part axis P and the journal axis P1 with the axis P as the center, and
The ratio of the depth of the web surface S to the outer diameter of the pin part 3 is set in a range of 0.2 to 0.5, and the maximum inner diameter d of the hollow part B to the outer diameter of the pin part 3 is set to a range of 0.2 to 0.5. A cast engine crankshaft characterized by having a ratio of 0.5 to 0.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14737180A JPS5828446B2 (en) | 1980-10-20 | 1980-10-20 | Cast engine crankshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14737180A JPS5828446B2 (en) | 1980-10-20 | 1980-10-20 | Cast engine crankshaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5773218A JPS5773218A (en) | 1982-05-07 |
| JPS5828446B2 true JPS5828446B2 (en) | 1983-06-16 |
Family
ID=15428710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14737180A Expired JPS5828446B2 (en) | 1980-10-20 | 1980-10-20 | Cast engine crankshaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5828446B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0236970Y2 (en) * | 1985-02-16 | 1990-10-08 | ||
| JP6117692B2 (en) * | 2013-12-27 | 2017-04-19 | 本田技研工業株式会社 | Crankshaft structure of internal combustion engine |
-
1980
- 1980-10-20 JP JP14737180A patent/JPS5828446B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5773218A (en) | 1982-05-07 |
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