JPH04119213A - Connecting rod - Google Patents
Connecting rodInfo
- Publication number
- JPH04119213A JPH04119213A JP12173690A JP12173690A JPH04119213A JP H04119213 A JPH04119213 A JP H04119213A JP 12173690 A JP12173690 A JP 12173690A JP 12173690 A JP12173690 A JP 12173690A JP H04119213 A JPH04119213 A JP H04119213A
- Authority
- JP
- Japan
- Prior art keywords
- oil hole
- oil
- connecting rod
- bearing
- bearing part
- 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.)
- Pending
Links
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 239000003921 oil Substances 0.000 description 31
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Landscapes
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、連接棒に関し、内燃機関に利用される。[Detailed description of the invention] (Industrial application field) The present invention relates to a connecting rod and is used in an internal combustion engine.
（従来の技術）
型打ち鍛造品又は機械加工した鍛造品よりなる内燃機関
用の連接棒は、第３図に示す如く、連接棒幹部ｌの一端
（小端部）に、ピストンピン軸受部２を一体に備え、他
端（大端部）にはクランクピン軸受部３を備えている。(Prior Art) As shown in FIG. 3, a connecting rod for an internal combustion engine made of a die forged product or a machined forged product has a piston pin bearing portion 2 at one end (small end portion) of the connecting rod trunk l. The other end (large end) is provided with a crank pin bearing portion 3.
そして、前記ピストンピン軸受部２は、第５図に示す如
くピストンピン４によりピストン５に連結され、サイク
ル運動するときのピストンピン４との境界部を潤滑する
ために、径方向に貫通する皿形の油穴６を形成している
（昭和５７年３月２０日改訂第６版３刷発行、発行所社
団法人日本機械学会機械工学便覧第１４−５２．５３参
照）。The piston pin bearing part 2 is connected to a piston 5 by a piston pin 4 as shown in FIG. (Refer to Mechanical Engineering Handbook No. 14-52.53, published by the Japan Society of Mechanical Engineers, published on March 20, 1980, revised 6th edition, 3rd printing).
（発明が解決しようとする課題）
ところで、前記油穴６の後向周縁には、第４図に示す如
く例えば０．５閣程度の面取り部６Ａを形成して袖穴後
向周縁の応力集中を少なくするようにしている。(Problem to be Solved by the Invention) By the way, as shown in FIG. 4, a chamfered portion 6A of approximately 0.5 mm is formed on the rearward periphery of the oil hole 6 to reduce stress concentration on the rearward periphery of the armhole. I'm trying to reduce it.
しかしながら、油穴６は径が２〜３■程度で非常に小さ
いこともあって、面取り部６Ａを寸法通りに形成するこ
とは困難であるし、しかも、軸受部２の内周面加工とな
り該内周面は周方向の曲面であることから、面取り部６
Ａの均一加工が実質的に困難で、このため、油穴６を通
しての潤滑を施こしても実運転において当該部分が叩か
れてフレッティングを起こし、ノツチが作用してクラッ
クが入り易くなるという問題があった。However, since the oil hole 6 has a very small diameter of about 2 to 3 cm, it is difficult to form the chamfered portion 6A to the exact dimensions. Since the inner peripheral surface is a curved surface in the circumferential direction, the chamfered portion 6
It is said that uniform machining of A is practically difficult, and for this reason, even if lubrication is applied through the oil hole 6, the relevant part is struck during actual operation, causing fretting, which causes notches to act and easily cracks. There was a problem.
本発明は、連接棒の小端部、すなわち、ピストンピン軸
受部の亀裂防止とより一層の潤滑作用を約束することに
より、前述従来技術の問題点を解決したことを目的とす
る。The present invention aims to solve the above-mentioned problems of the prior art by preventing cracking of the small end of the connecting rod, that is, the piston pin bearing, and providing better lubrication.
（課題を解決するための手段）
本発明は、連接棒幹部１に一体のピストンピン軸受部２
に、該軸受部２を径方向に貫通して油穴６を形成してい
る連接棒において、前述の目的を達成するために、次の
技術的手段を講じている。(Means for Solving the Problems) The present invention provides a piston pin bearing portion 2 integral with a connecting rod trunk 1.
In order to achieve the above-mentioned object in the connecting rod which radially passes through the bearing portion 2 and forms the oil hole 6, the following technical measures are taken.
すなわち、本発明は、前記軸受部２の径外周面２Ａに、
前記油穴６の後外周縁の外域を取囲みかつ軸受巾全体に
わたる増肉部７を備え、更に、前記軸受部２の後内周面
２Ｂに、前記油穴６の後向周縁の外域を取囲んで弯曲凹
状の油溜部８を備えていることを特徴とするものである
。That is, in the present invention, on the radially outer circumferential surface 2A of the bearing portion 2,
The outer area of the rear outer periphery of the oil hole 6 is provided with a thickened part 7 that surrounds the outer area of the rear outer periphery of the oil hole 6 and extends over the entire bearing width. It is characterized by having an oil reservoir 8 surrounding it and having a curved concave shape.
（作 用〉
本発明に係る連接棒を、ピストンピン４を介してピスト
ン５に連結して実運転を行うとき、軸受部２に応力が作
用し、油穴６の周縁からフレ・ンティングによるクラッ
クが発生しようとしても、増肉部７による断面係数の増
大によって確実にクランク発生を抑止する。(Function) When the connecting rod according to the present invention is connected to the piston 5 via the piston pin 4 and is in actual operation, stress acts on the bearing portion 2, causing frentening from the periphery of the oil hole 6. Even if a crack is about to occur, the increase in section modulus due to the thickened portion 7 reliably prevents the occurrence of a crack.
また、軸受部２の後内周面２Ｂに、油穴６の後向周縁の
外域を取囲んで弯曲凹状の油溜部８が形成しであるから
、油穴６を通じて侵入した潤滑油は油溜部８に保留され
、ピストンピン４との間に油膜を形成し、弯曲凹状の油
溜部８とピストンピン４との均一な当りが保証されるこ
とと相まってフレッティングを抑え、油穴６からの破断
現象を効果的に防止する。Furthermore, since a curved concave oil reservoir 8 is formed on the rear inner circumferential surface 2B of the bearing 2, surrounding the outer area of the rearward edge of the oil hole 6, the lubricating oil that has entered through the oil hole 6 is The oil is retained in the reservoir 8 and forms an oil film between it and the piston pin 4, which ensures uniform contact between the curved concave oil reservoir 8 and the piston pin 4, suppresses fretting, and prevents oil from forming in the oil hole 6. Effectively prevents the phenomenon of breakage.
更に、増肉部７は軸受部２の径外周面２Ａに形成してあ
り、従って、肉盛り等することも容易となる。Further, the thickened portion 7 is formed on the radially outer circumferential surface 2A of the bearing portion 2, and therefore, it is easy to build up the thickness.
（実施例）
以下、図面を参照して本発明の実施例を詳述する。なお
、前述した従来技術と共通する部分は共通符号で説明す
る。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. Note that parts common to the prior art described above will be explained using common symbols.
第１図および第２図において、型打ち鍛造品等よりなる
連接棒幹部１の小端部に一体に形成されているピストン
ピン軸受部２には、該軸受部２を径方向に貫通した皿頭
状の油穴６が形成しである。In FIGS. 1 and 2, a piston pin bearing portion 2 integrally formed at the small end of a connecting rod trunk 1 made of a die-forged product, etc. has a countersunk penetrating the bearing portion 2 in the radial direction. A head-shaped oil hole 6 is formed.
軸受部２の径外周面２Ａには、油穴６の後外周縁の外域
を取囲み軸受巾全体にわたって増肉部７が形成してあり
、該増肉部７は例えば肉盛等で形成される。A thickened portion 7 is formed on the radially outer circumferential surface 2A of the bearing portion 2 over the entire bearing width, surrounding the outer area of the rear outer circumferential edge of the oil hole 6, and the thickened portion 7 is formed by, for example, overlaying. Ru.
前記増肉部７は例えば厚みｔは１．０ｍ、周長しは２０
閣程度として軸受部Ｌ１の全体にわたって軸受部２の径
外周面２Ａに形成されている。For example, the thickened portion 7 has a thickness t of 1.0 m and a circumference of 20 m.
It is formed on the radially outer circumferential surface 2A of the bearing portion 2 over the entire bearing portion L1.
軸受部２の後内周面２Ｂには、油穴６の後向周縁の外域
を取囲んで円周方向長円形状の弯曲凹状の油溜部８が形
成されている。On the rear inner circumferential surface 2B of the bearing portion 2, a curved concave oil reservoir portion 8 having a circumferentially oval shape is formed so as to surround the outer area of the rearward peripheral edge of the oil hole 6.
前記油溜部８は例えば深さ０．５ｍ、周長１０閣程度の
リセス（ヌスミ）を後内周面２Ｂに機械加工することに
よって形成される。The oil sump portion 8 is formed by machining a recess with a depth of 0.5 m and a circumference of about 10 mm on the rear inner circumferential surface 2B, for example.
従って、増肉部７によって油穴６を穿設したことによる
断面係数が小さくなったのが回復され、また、油溜部８
によってピストンピン４との均一な当り面が保証され、
しかも、油穴６を通じて供給された潤滑油は該油溜部８
に保留されてピストンピン４と後内周面２Ｂとの間に油
膜造成を保証する。Therefore, the reduced section modulus due to the drilling of the oil hole 6 is recovered by the thickened portion 7, and the oil sump portion 8
This ensures a uniform contact surface with the piston pin 4,
Moreover, the lubricating oil supplied through the oil hole 6 is
This ensures that an oil film is formed between the piston pin 4 and the rear inner circumferential surface 2B.
（発明の効果）
本発明に係る連接棒は以上の通りであり、軸受部２の径
外周面２Ａには、油穴６の外周域を取囲んで軸受巾全体
にわたって増肉部７が形成しであるので、軸受部２の断
面係数は充分に確保されてクランク発生とクラック波及
を確実に防止できる。(Effects of the Invention) The connecting rod according to the present invention is as described above, and the thickened portion 7 is formed on the radial outer peripheral surface 2A of the bearing portion 2 over the entire bearing width, surrounding the outer peripheral area of the oil hole 6. Therefore, the section modulus of the bearing portion 2 is sufficiently ensured to reliably prevent the occurrence of cranking and the propagation of cracks.
また、軸受部２の後内周面２Ｂには、油穴６の外周域を
取囲んで弯曲凹状の油溜部８が形成しであることから、
ピストンピン４との均一な当りが保証されるし、後内周
面２Ｂとビン４との界面に油膜を確実に造成することが
できて、フレッティングによるクランク発生を阻止でき
る。Furthermore, since a curved concave oil reservoir 8 is formed on the rear inner circumferential surface 2B of the bearing part 2, surrounding the outer peripheral area of the oil hole 6,
Uniform contact with the piston pin 4 is guaranteed, and an oil film can be reliably formed at the interface between the rear inner circumferential surface 2B and the pin 4, thereby preventing cranking due to fretting.
従って、本発明に係る連接棒は内燃機関に使用しても耐
久性に富み有益である。Therefore, the connecting rod according to the invention is durable and advantageous for use in internal combustion engines.
図面は本発明の実施例と従来例とを示しており、第１図
は本発明実施例の要部断面図、第２図は同じく要部平面
図、第３図は一部省略した連接棒の正面図、第４図は従
来例の要部断面図、第５図はピストンに連結した状態の
断面図である。
１・・・連接棒幹部、２・・・ピストンピン軸受部、６
・・・油穴、７・・・増肉部、８・・・油溜部。The drawings show an embodiment of the present invention and a conventional example. Fig. 1 is a sectional view of the main part of the embodiment of the present invention, Fig. 2 is a plan view of the main part, and Fig. 3 shows a connecting rod with some parts omitted. FIG. 4 is a sectional view of a main part of the conventional example, and FIG. 5 is a sectional view of the piston connected to the piston. 1... Connecting rod trunk, 2... Piston pin bearing section, 6
...Oil hole, 7...Thickened part, 8...Oil sump part.
Claims (1)
２）に、該軸受部（２）を径方向に貫通して油穴（６）
を形成している連接棒において、 前記軸受部（２）の径外周面（２Ａ）に、前記油穴（６
）の後外周縁の外域を取囲みかつ軸受巾全体にわたる増
肉部（７）を備え、更に、前記軸受部（２）の後内周面
（２Ｂ）に、前記油穴（６）の後向周縁の外域を取囲ん
で弯曲凹状の油溜部（８）を備えていることを特徴とす
る連接棒。(1) The piston pin bearing part (
2), an oil hole (6) is inserted through the bearing part (2) in the radial direction.
In the connecting rod forming the bearing part (2), the oil hole (6
) is provided with a thickened part (7) surrounding the outer area of the rear outer peripheral edge and extending over the entire bearing width, and further provided with a thickened part (7) on the rear inner peripheral surface (2B) of the bearing part (2) after the oil hole (6). A connecting rod characterized in that it is provided with a curved concave oil sump (8) surrounding the outer area of the facing periphery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12173690A JPH04119213A (en) | 1990-05-11 | 1990-05-11 | Connecting rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12173690A JPH04119213A (en) | 1990-05-11 | 1990-05-11 | Connecting rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04119213A true JPH04119213A (en) | 1992-04-20 |
Family
ID=14818609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12173690A Pending JPH04119213A (en) | 1990-05-11 | 1990-05-11 | Connecting rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04119213A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009281242A (en) * | 2008-05-21 | 2009-12-03 | Honda Motor Co Ltd | Link type variable stroke engine |
| JP2015075018A (en) * | 2013-10-08 | 2015-04-20 | トヨタ自動車株式会社 | Cylinder block |
| CN107246436A (en) * | 2017-06-12 | 2017-10-13 | 南通爱慕希机械股份有限公司 | A kind of engine link |
-
1990
- 1990-05-11 JP JP12173690A patent/JPH04119213A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009281242A (en) * | 2008-05-21 | 2009-12-03 | Honda Motor Co Ltd | Link type variable stroke engine |
| JP2015075018A (en) * | 2013-10-08 | 2015-04-20 | トヨタ自動車株式会社 | Cylinder block |
| CN107246436A (en) * | 2017-06-12 | 2017-10-13 | 南通爱慕希机械股份有限公司 | A kind of engine link |
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