JPH05312210A - Crank pin structure for crankshaft - Google Patents

Crank pin structure for crankshaft

Info

Publication number
JPH05312210A
JPH05312210A JP11597792A JP11597792A JPH05312210A JP H05312210 A JPH05312210 A JP H05312210A JP 11597792 A JP11597792 A JP 11597792A JP 11597792 A JP11597792 A JP 11597792A JP H05312210 A JPH05312210 A JP H05312210A
Authority
JP
Japan
Prior art keywords
crank pin
crankshaft
connecting rod
crankpin
oil hole
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.)
Granted
Application number
JP11597792A
Other languages
Japanese (ja)
Other versions
JP2858505B2 (en
Inventor
Toshiro Shimamoto
敏郎 島本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to JP4115977A priority Critical patent/JP2858505B2/en
Publication of JPH05312210A publication Critical patent/JPH05312210A/en
Application granted granted Critical
Publication of JP2858505B2 publication Critical patent/JP2858505B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Lubrication Of Internal Combustion Engines (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

PURPOSE:To provide crank pin structure for a crankshaft wherein generation of vibration and noise can be controlled while lubrication can be enhanced to effectively avoid seizure of a crank pin part. CONSTITUTION:In a peripheral surface part on both sides of a valley part 15, which is opposing to a crankshaft center C. of a crank pin 2 being in sliding contact with a connecting rod metal 4, a recess part 16A is formed in such a manner as to contain a whole periphery of an oil hole 9 so that thickness of the crank pin 2 can be reduced and an oil retainer can be formed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、エンジンのクランクシ
ャフトにおけるクランクピン構造に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crankpin structure for an engine crankshaft.

【0002】[0002]

【従来の技術】自動車用エンジンのピストン−クランク
機構にあっては、高回転化、フリクション低減のための
コンロッドメタル、クランクシャフトメタル幅縮小化等
軸受部の使用条件は増々厳しくなっている。
2. Description of the Related Art In a piston-crank mechanism for an automobile engine, the operating conditions of the bearing are becoming more and more strict, such as high rotation speed and reduction in friction of connecting rod metal and crankshaft metal.

【0003】ところで、クランクシャフトにおけるクラ
ンクピン部(コンロッドメタルとの摺動部)のメタル面
圧及び油膜厚さの解析結果等からも解るように、クラン
クピンの谷部(クランクシャフトセンターに対向した周
面一部)が、遠心力により、主にコンロッドメタルと接
触して回転している。
By the way, as can be seen from the analysis results of the metal surface pressure and the oil film thickness of the crankpin portion (sliding portion with the connecting rod metal) of the crankshaft, the valley portion of the crankpin (facing the crankshaft center). Due to centrifugal force, a part of the peripheral surface is mainly in contact with the connecting rod metal and is rotating.

【0004】即ち、谷部以外の部分は、瞬間的に爆発荷
重を受ける山部(谷部の反対側の周面一部)を除いて殆
んど接触しないのである。事実、エンジン耐久結果をみ
ても、クランクピンの谷側が荒れているケースが大半で
ある。
That is, the parts other than the valleys hardly contact except for the peaks (a part of the peripheral surface on the opposite side of the valleys) which are momentarily subjected to an explosion load. In fact, even if you look at the engine durability results, in most cases the valley side of the crankpin is rough.

【0005】[0005]

【発明が解決しようとする課題】そのため、従来のクラ
ンクピンにあっては、コンロッドメタルと接触しない領
域の存在により、クランクシャフトセンターに対する一
次モーメントが不必要に大きくなって振動・騒音発生の
一要因となっている。
Therefore, in the conventional crankpin, the presence of the region that does not contact the connecting rod metal causes the primary moment to the crankshaft center to become unnecessarily large, which is one of the factors that cause vibration and noise. Has become.

【0006】また、油孔周辺の加工時のかえり,バリ等
の存在により、面取り作業が不十分であると、コンロッ
ドメタルが焼付くというケースもあった。
In addition, in some cases, when the chamfering work is insufficient due to the presence of burrs, burrs and the like during the processing around the oil holes, the connecting rod metal may be seized.

【0007】そこで、本発明の目的は、振動・騒音の発
生を制御できる一方で、潤滑を良好にしてクランクピン
部の焼付きを効果的に回避できるクランクシャフトのク
ランクピン構造を提供することにある。
Therefore, an object of the present invention is to provide a crankpin structure for a crankshaft, which can control the generation of vibrations and noises and can effectively prevent the seizure of the crankpin portion by improving lubrication. is there.

【0008】[0008]

【課題を解決するための手段】前記目的を達成するため
の、本発明の構成は、コンロッドメタルと摺接するクラ
ンクピンのクランクシャフトセンターに対向する谷部両
側の周面部分に、油孔周辺の少なくとも一部を含むよう
にして凹部を形成したことを特徴とする。
SUMMARY OF THE INVENTION To achieve the above object, the structure of the present invention is such that a peripheral portion of both sides of a valley portion facing a crankshaft center of a crankpin which is in sliding contact with a connecting rod metal has a peripheral portion of an oil hole. The recess is formed so as to include at least a part.

【0009】[0009]

【作用】前記構成によれば、クランクシャフトセンター
に対する一次モーメントが低減され、クランクシャフト
のバランス率が向上される一方、油孔周辺の加工時にお
けるかえり,バリ等が除去され、焼付き性が向上され
る。勿論、油溜りの形成により潤滑性も向上される。
According to the above construction, the primary moment with respect to the crankshaft center is reduced and the balance ratio of the crankshaft is improved, while burrs, burrs and the like are removed when machining around the oil hole, and seizure is improved. To be done. Of course, the formation of the oil sump also improves the lubricity.

【0010】[0010]

【実施例】以下、本発明の一実施例を添付図面に基づい
て説明する。図1に示すように、エンジンを構成するク
ランクシャフト1に一体に形成されたクランクピン2に
は、コンロッド3の大端部4がコンロッドメタル5を介
して回転自在に嵌合され、このコンロッド3の小端部6
には図示しない気筒内を往復動し得るピストン7がピス
トンピン8を介して枢支されている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a large end 4 of a connecting rod 3 is rotatably fitted through a connecting rod metal 5 to a crankpin 2 integrally formed with a crankshaft 1 constituting an engine. Small end 6
A piston 7 capable of reciprocating in a cylinder (not shown) is pivotally supported via a piston pin 8.

【0011】また、クランクピン8には縦横に油孔9が
穿設され、この油孔9は油通路10を介してクランクジ
ャーナル11の油孔12に通じ、この油孔12から潤滑
油が供給されるようになっている。なお、図中13はク
ランクアーム、14はバランスウエイトである。
Further, an oil hole 9 is bored vertically and horizontally in the crank pin 8, the oil hole 9 communicates with an oil hole 12 of a crank journal 11 through an oil passage 10, and lubricating oil is supplied from the oil hole 12. It is supposed to be done. In the figure, 13 is a crank arm, and 14 is a balance weight.

【0012】そして、本実施例では、図2にも示すよう
に、クランクピン2のクランクシャフトセンターCに対
向する谷部(コンロッドメタル5と接触して回転する領
域)15両側の周面部分に、凹部16Aが形成されてい
る。
In the present embodiment, as shown in FIG. 2, the peripheral surface portions on both sides of the valley portion (a region where the crank pin 2 contacts and rotates the connecting rod metal 5) 15 facing the crankshaft center C of the crankpin 2 are provided. The recess 16A is formed.

【0013】前記凹部16Aは、クランクピン2の当該
凹部形成部分に開口する油孔9の周辺全部を含むように
して縦長に形成される。
The recess 16A is formed vertically so as to include the entire periphery of the oil hole 9 which is opened in the recess forming portion of the crankpin 2.

【0014】この凹部16Aの形成により、クランクピ
ン2の減肉が図れ、クランクシャフトセンターCに対す
る一次モーメントの低減によりクランクシャフトのバラ
ンス率の向上が図れる。この結果、エンジンの振動・騒
音発生が抑制される。
By forming the concave portion 16A, the thickness of the crank pin 2 can be reduced, and the primary moment with respect to the crank shaft center C can be reduced to improve the balance ratio of the crank shaft. As a result, engine vibration and noise are suppressed.

【0015】また、凹部16A形成時に、油孔9の加工
時に形成された油孔周辺のかえり,バリが除去されるの
で、コンロッドメタル5との間での焼付き性が向上され
る。
Further, when forming the recess 16A, burrs and burrs around the oil hole formed during the processing of the oil hole 9 are removed, so that seizure with the connecting rod metal 5 is improved.

【0016】さらに、凹部16Aが油溜りとなって潤滑
油が常時滞留するので、前述した谷部15等への潤滑油
供給が良好となり、当該谷部15等の荒れや焼付きが改
善される。
Further, since the recess 16A serves as an oil reservoir and the lubricating oil always stays, the supply of the lubricating oil to the valley portion 15 and the like described above becomes good, and the roughness and seizure of the valley portion 15 and the like are improved. ..

【0017】図3及び図4は、本発明の別の実施例を示
すものである。これは、凹部16Bを、油孔9周辺の下
半部のみ含んで前記谷部15と接するように形成した例
である。
3 and 4 show another embodiment of the present invention. This is an example in which the concave portion 16B is formed so as to include only the lower half portion around the oil hole 9 and contact the valley portion 15.

【0018】これによれば、谷部15への潤滑油供給が
より積極的に行われるという利点が得られる。
According to this, there is an advantage that the lubricating oil is more positively supplied to the valley portion 15.

【0019】なお、本発明は上記各実施例に限定され
ず、本発明の要旨を逸脱しない範囲内で各種の変更が可
能であることは言う迄もない。
Needless to say, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without departing from the gist of the present invention.

【0020】[0020]

【発明の効果】以上説明したように本発明によれば、エ
ンジンの振動・騒音が低減できるとともに、クランクピ
ン部での潤滑性が向上して焼付きや荒れが改善できる。
As described above, according to the present invention, the vibration and noise of the engine can be reduced, and the lubricity at the crank pin portion can be improved to prevent seizure and roughness.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を示す破断側面図である。FIG. 1 is a cutaway side view showing an embodiment of the present invention.

【図2】同じく要部を正面から視た説明図である。FIG. 2 is an explanatory view of the same main part viewed from the front.

【図3】本発明の別の実施例を示す要部側面図である。FIG. 3 is a side view of an essential part showing another embodiment of the present invention.

【図4】同じく要部を正面から視た説明図である。FIG. 4 is an explanatory view of the same main part viewed from the front.

【符号の説明】[Explanation of symbols]

1 クランクシャフト 2 クランクピン 5 コンロッドメタル 9 油孔 15 谷部 16A,16B 凹部 C クランクシャフトセンター 1 Crankshaft 2 Crank Pin 5 Connecting Rod Metal 9 Oil Hole 15 Valley 16A, 16B Recess C Crankshaft Center

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 コンロッドメタルと摺接するクランクピ
ンのクランクシャフトセンターに対向する谷部両側の周
面部分に、油孔周辺の少なくとも一部を含むようにして
凹部を形成したことを特徴とするクランクシャフトのク
ランクピン構造。
1. A crankshaft characterized in that a concave portion is formed in a peripheral surface portion on both sides of a valley portion facing a crankshaft center of a crankpin which is in sliding contact with a connecting rod metal so as to include at least a part of the periphery of an oil hole. Crank pin structure.
JP4115977A 1992-05-08 1992-05-08 Crankshaft crankpin structure Expired - Fee Related JP2858505B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4115977A JP2858505B2 (en) 1992-05-08 1992-05-08 Crankshaft crankpin structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4115977A JP2858505B2 (en) 1992-05-08 1992-05-08 Crankshaft crankpin structure

Publications (2)

Publication Number Publication Date
JPH05312210A true JPH05312210A (en) 1993-11-22
JP2858505B2 JP2858505B2 (en) 1999-02-17

Family

ID=14675825

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4115977A Expired - Fee Related JP2858505B2 (en) 1992-05-08 1992-05-08 Crankshaft crankpin structure

Country Status (1)

Country Link
JP (1) JP2858505B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011094688A (en) * 2009-10-29 2011-05-12 Toyota Motor Corp Crankshaft structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102135130A (en) * 2011-05-04 2011-07-27 天润曲轴股份有限公司 Spheroidal cast iron crankshaft with novel oil hole structure

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54108854U (en) * 1978-01-19 1979-07-31

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54108854U (en) * 1978-01-19 1979-07-31

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011094688A (en) * 2009-10-29 2011-05-12 Toyota Motor Corp Crankshaft structure

Also Published As

Publication number Publication date
JP2858505B2 (en) 1999-02-17

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A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 19981104

LAPS Cancellation because of no payment of annual fees