JP2001115811A - Lubricating device for engine - Google Patents

Lubricating device for engine

Info

Publication number
JP2001115811A
JP2001115811A JP29368699A JP29368699A JP2001115811A JP 2001115811 A JP2001115811 A JP 2001115811A JP 29368699 A JP29368699 A JP 29368699A JP 29368699 A JP29368699 A JP 29368699A JP 2001115811 A JP2001115811 A JP 2001115811A
Authority
JP
Japan
Prior art keywords
hole
lubricating oil
piston pin
piston
fuel
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
Application number
JP29368699A
Other languages
Japanese (ja)
Inventor
Naoki Hiraoka
直樹 平岡
Makoto Sawai
誠 澤井
Masayuki Nakajima
正之 中島
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.)
Yanmar Co Ltd
Original Assignee
Yanmar Diesel Engine Co Ltd
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 Yanmar Diesel Engine Co Ltd filed Critical Yanmar Diesel Engine Co Ltd
Priority to JP29368699A priority Critical patent/JP2001115811A/en
Publication of JP2001115811A publication Critical patent/JP2001115811A/en
Pending legal-status Critical Current

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  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

PROBLEM TO BE SOLVED: To surely hold an oil film of a combustion chamber side where large compression pressure is received from a combustion chamber in an explosion stoke especially, between a piston pin fixed to a connecting rod small end part and a piston pin fitting-in hole, and to surely hold the oil film of a sliding contact part of a fuel cam of a cam shaft upper end part and a fuel tappet of a fuel injection pump, in an engine having a vertical cam shaft. SOLUTION: In this lubricating device for the engine, a lubricating oil groove is formed on the piston pin fitting-in hole of the piston deviating to a reverse combustion chamber side. A lubricating oil leading-in hole is drilled on the reverse combustion chamber side of the piston pin fitting-in hole. A lubricating oil leasing-in cutout communicated with a piston pin hole is disposed on a side part of a piston skirt as well as drilling the lubricating oil leading-in hole on the reverse combustion chamber side of the piston pin fitting-in hole. Lubricating oil pressure is supplied to an upper end part of a vertical cam shaft, and a cutout for making lubricating oil flow a sliding part of the fuel cam of the cam shaft and the fuel tappet of the fuel injection pump, is disposed on a cylinder arranged on a lower end of the cam shaft hole of the cylinder for supporting the cam shaft.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、コネクテイングロ
ッド小端部に固定されたピストンピンとピストンピン嵌
入孔との間、縦型カム軸上端部の燃料カムと燃料噴射ポ
ンプの燃料タペットとの摺動部のような、エンジン各部
の潤滑を改善するためのエンジンの潤滑装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide between a piston pin fixed to a small end of a connecting rod and a piston pin insertion hole, between a fuel cam at an upper end of a vertical cam shaft and a fuel tappet of a fuel injection pump. The present invention relates to an engine lubrication device for improving lubrication of various parts of an engine such as a moving part.

【0002】[0002]

【従来の技術】従来、コネクテイングロッド小端部に固
定されたピストンピンとピストンピン嵌入孔との間、特
に爆発行程において燃焼室から大きい圧縮圧力を受ける
燃焼室側の油膜を確実に保持することは極めて困難であ
った。また、縦型カム軸を有するエンジンにおいて、カ
ム軸上端部の燃料カムと燃料噴射ポンプの燃料タペット
との摺動部の油膜を確実に保持することも極めて困難で
あった。
2. Description of the Related Art Conventionally, it is necessary to reliably hold an oil film between a piston pin fixed to a small end of a connecting rod and a piston pin insertion hole, particularly on a combustion chamber side which receives a large compression pressure from the combustion chamber during an explosion stroke. Was extremely difficult. Also, in an engine having a vertical camshaft, it has been extremely difficult to reliably hold an oil film at a sliding portion between the fuel cam at the upper end of the camshaft and the fuel tappet of the fuel injection pump.

【0003】[0003]

【発明が解決しようとする課題】本発明は、コネクテイ
ングロッド小端部に固定されたピストンピンとピストン
ピン嵌入孔との間の、特に爆発行程において燃焼室から
大きい圧縮圧力を受ける燃焼室側の油膜を確実に保持す
ること、縦型カム軸を有するエンジンにおいて、カム軸
上端部の燃料カムと燃料噴射ポンプの燃料タペットとの
摺接部の油膜を確実に保持することを目的としている。
SUMMARY OF THE INVENTION The present invention relates to a piston between a piston pin fixed to a small end of a connecting rod and a piston pin insertion hole, particularly on the side of a combustion chamber which receives a large compression pressure from the combustion chamber during an explosion stroke. It is an object of the present invention to reliably hold an oil film and, in an engine having a vertical camshaft, to reliably hold an oil film at a sliding contact portion between a fuel cam at an upper end of a camshaft and a fuel tappet of a fuel injection pump.

【0004】[0004]

【課題を解決するための手段】請求項1の発明は、ピス
トンのピストンピン嵌入孔に、反燃焼室側へ偏倚して潤
滑油溝を形成したことを特徴とするエンジンの潤滑装置
である。
According to the present invention, there is provided a lubricating device for an engine, wherein a lubricating oil groove is formed in a piston pin fitting hole of a piston so as to be deviated toward a side opposite to the combustion chamber.

【0005】請求項2の発明は、ピストンピン嵌入孔の
反燃焼室側に潤滑油導入孔を穿設した、請求項1に記載
のエンジンの潤滑装置である。
According to a second aspect of the present invention, there is provided an engine lubricating apparatus according to the first aspect, wherein a lubricating oil introduction hole is formed on a side opposite to the combustion chamber from the piston pin insertion hole.

【0006】請求項3の発明は、ピストンスカートの側
部にピストンピン嵌入孔に連通する潤滑油導入切欠を設
けた、請求項2に記載のエンジンの潤滑装置である。
According to a third aspect of the present invention, there is provided the lubricating device for an engine according to the second aspect, wherein a lubricating oil introduction notch communicating with the piston pin insertion hole is provided on a side portion of the piston skirt.

【0007】請求項4の発明は、ピストンスカートの側
部にピストンピン嵌入孔に連通する潤滑油導入切欠を設
けた、請求項1に記載のエンジンの潤滑装置である。
According to a fourth aspect of the present invention, there is provided the engine lubricating device according to the first aspect, wherein a lubricating oil introduction notch communicating with the piston pin fitting hole is provided on a side portion of the piston skirt.

【0008】請求項5の発明は、ピストンピン嵌入孔の
反燃焼室側に潤滑油導入孔を穿設するとともに、ピスト
ンスカートの側部にピストンピン嵌入孔に連通する潤滑
油導入切欠を設けたことを特徴とするエンジンの潤滑装
置である。
According to a fifth aspect of the present invention, a lubricating oil introduction hole is formed on the piston pin insertion hole on the side opposite to the combustion chamber, and a lubrication oil introduction cutout communicating with the piston pin insertion hole is provided on the side of the piston skirt. A lubricating device for an engine, characterized in that:

【0009】請求項6の発明は、縦型カム軸の上端部に
潤滑油圧力を供給し、上記カム軸を支承するシリンダの
カム軸穴の下端のシリンダに、カム軸の燃料カムと燃料
噴射ポンプの燃料タペットとの摺接部に潤滑油を流下さ
せる切欠を設けたことを特徴とするエンジンの潤滑装置
である。
According to a sixth aspect of the present invention, a lubricating oil pressure is supplied to an upper end portion of a vertical cam shaft, and a fuel cam of the cam shaft and a fuel injection are supplied to a cylinder at a lower end of a cam shaft hole of a cylinder supporting the cam shaft. A lubricating device for an engine, wherein a notch for allowing lubricating oil to flow down is provided in a sliding contact portion of a pump with a fuel tappet.

【0010】[0010]

【発明の実施の形態】図1において、ピストン1には、
図示されていないコネクテイングロッド小端部に中間部
が圧入等の手段で固着されたピストンピン2の嵌るピス
トンピン嵌入孔3が設けてあり、左右の嵌入孔3の長さ
方向中間部には、例えば上側の燃焼室4と反対側(図示
されていない下側のクランク軸側)へ偏倚した略V形ま
たは半円弧状断面の潤滑油溝5が半円弧状に形成されて
いる。この溝5は、例えば図2のように、嵌入孔3の中
心O1より僅かに下方へ偏倚した点O2を中心として嵌
入孔3と同径の旋盤加工により嵌入孔3の下半部に形成
され、燃焼室4から離れる(下方へ行く)に連れて深く
なる。各側の溝5は嵌入孔3の上端部を除く部分に複数
個あってもよく、同一深さであってもよい。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG.
At the small end of the connecting rod (not shown), an intermediate portion is provided with a piston pin insertion hole 3 into which the piston pin 2 is fixed by means of press-fitting or the like. For example, a lubricating oil groove 5 having a substantially V-shaped or semi-circular cross-section deviating toward the opposite side of the upper combustion chamber 4 (the lower crankshaft side not shown) is formed in a semi-arc shape. The groove 5 is formed in the lower half of the fitting hole 3 by lathing with the same diameter as the fitting hole 3 around a point O2 slightly deviated below the center O1 of the fitting hole 3 as shown in FIG. 2, for example. , Becomes deeper as it goes away (goes down) from the combustion chamber 4. There may be a plurality of grooves 5 on each side except for the upper end of the fitting hole 3 and may have the same depth.

【0011】エンジンの運転中には、ピストン1の下方
のクランク室6およびこの室6と連通したピストンピン
2とライナー面7との間の室8には圧力が脈動するオイ
ルミストが充満しており、室8内とクランク室6内のオ
イルミストは夫々矢印A、Bで示すようにピストンピン
2と嵌入孔3の間の摺動部に侵入してそこに油膜を形成
する。この摺動部の内、最も過酷な条件に晒されるの
は、燃焼室4側の部分(上部)であり、即ちその上部に
は、爆発行程においてピストン1からピストンピン2に
対して下向きの大きい圧力がかかり、かつ燃焼室4から
多くの熱が伝達される。従って、上部の油膜は切れ易
く、油膜が切れると摩耗が顕著になるが、図1のよう
に、反燃焼室4側へ偏倚した溝5が上部に達していない
ため、上部の潤滑油が溝5を通して逃げることを可及的
に防止でき、即ち、潤滑油を確実に保持できるようにな
る。
During operation of the engine, a crank chamber 6 below the piston 1 and a chamber 8 between the piston pin 2 communicating with the chamber 6 and the liner surface 7 are filled with oil mist whose pressure pulsates. The oil mist in the chamber 8 and the crank chamber 6 penetrates into the sliding portion between the piston pin 2 and the fitting hole 3 as shown by arrows A and B, respectively, and forms an oil film there. Among the sliding parts, the part (upper part) on the combustion chamber 4 side, which is exposed to the most severe conditions, that is, the upper part, which is large downward from the piston 1 to the piston pin 2 during the explosion stroke, Pressure is applied and much heat is transferred from the combustion chamber 4. Therefore, the upper oil film is easily cut, and when the oil film is cut, abrasion becomes remarkable. However, as shown in FIG. 1, since the groove 5 biased to the anti-combustion chamber 4 side does not reach the upper portion, the upper lubricating oil is not 5 can be prevented as much as possible, that is, the lubricating oil can be reliably held.

【0012】図1に仮想線で示すように、溝5の下端部
に連通する潤滑油導入孔9を設けると、クランク室6内
のオイルミストを溝5の下端部に積極的に供給すること
ができるようになる。孔9から導入された潤滑油は、主
としてピストン1の下降時に慣性により、上方全面へ送
られ、潤滑作用に関与する。
As shown by the phantom line in FIG. 1, when the lubricating oil introduction hole 9 communicating with the lower end of the groove 5 is provided, the oil mist in the crank chamber 6 is positively supplied to the lower end of the groove 5. Will be able to The lubricating oil introduced from the hole 9 is sent to the entire upper surface mainly by inertia when the piston 1 descends, and participates in the lubricating action.

【0013】図3では図1の溝5が採用されていない代
わりに、潤滑油導入孔9が採用されている。この孔9は
ピストンピン嵌入孔3内への潤滑油の導入効率の向上に
寄与する。
FIG. 3 does not employ the groove 5 of FIG. 1 but employs a lubricating oil introduction hole 9. This hole 9 contributes to an improvement in the efficiency of introducing lubricating oil into the piston pin insertion hole 3.

【0014】図4において、ピストン1のピストンスカ
ート12には、ピストンピン嵌入孔3をクランク室6に
よく連通させるための潤滑油導入切欠13が設けてあ
り、この切欠13は例えば図5のように、ピストン1内
の空間14を介して嵌入孔3に連通している。クランク
室6内のオイルミストは切欠13を経て、または空間1
4を経て嵌入孔3に導入される。
In FIG. 4, the piston skirt 12 of the piston 1 is provided with a lubricating oil introduction notch 13 for making the piston pin insertion hole 3 well communicate with the crank chamber 6, and this notch 13 is, for example, as shown in FIG. In addition, it communicates with the fitting hole 3 via a space 14 in the piston 1. The oil mist in the crank chamber 6 passes through the notch 13 or the space 1
4 and is introduced into the fitting hole 3.

【0015】図6において、縦型のカム軸16の上端部
17は、シリンダブロック18の下開きのカム軸穴19
に回転自在に嵌合し、カム軸穴19に開口しているシリ
ンダブロック18の肉厚内の油孔20から供給される潤
滑油により潤滑される。カム軸16上の燃料カム21の
上端面はカム軸穴19の下端を囲む面22に当接し、カ
ム軸上端部17の下側の環状溝23は切欠24を経て燃
料噴射ポンプ25の燃料タペット26に向かい開口して
いる。切欠24は孔を含む意味で使用されている。
In FIG. 6, an upper end portion 17 of a vertical camshaft 16 has a camshaft hole 19 opening downward from a cylinder block 18.
And is lubricated by lubricating oil supplied from an oil hole 20 in the thickness of the cylinder block 18 which is open to the camshaft hole 19. The upper end surface of the fuel cam 21 on the camshaft 16 contacts the surface 22 surrounding the lower end of the camshaft hole 19, and the lower annular groove 23 of the upper end portion 17 of the camshaft passes through the notch 24 through the fuel tappet of the fuel injection pump 25. It opens toward 26. The notch 24 is used to include a hole.

【0016】カム軸上端部17を潤滑した後の潤滑油は
環状溝23内へ流下し、切欠24を経て燃料カム21と
燃料タペット26の間の摺接部27を潤滑し、引き続き
下方へ流下して動弁カムや他の燃料カム(共に図示せ
ず)を潤滑する。
After lubricating the upper end portion 17 of the camshaft, the lubricating oil flows down into the annular groove 23, lubricates the sliding contact portion 27 between the fuel cam 21 and the fuel tappet 26 via the notch 24, and subsequently flows downward. To lubricate the valve cam and other fuel cams (both not shown).

【0017】燃料タペット26に対向するシリンダブロ
ック18の部分には図7のように切欠面29が設けてあ
り、これによりシリンダブロック18に対する燃料噴射
ポンプ25の取付位置をカム軸16側へ寄せてポンプ2
5の左方への張出し量を減し、エンジンのコンパクト化
を図ることができる。
A cut-out surface 29 is provided in the portion of the cylinder block 18 facing the fuel tappet 26, as shown in FIG. 7, whereby the mounting position of the fuel injection pump 25 with respect to the cylinder block 18 is shifted toward the cam shaft 16 side. Pump 2
5 can be reduced to the left, and the engine can be made more compact.

【0018】[0018]

【発明の効果】請求項1の発明によると、爆発圧による
ピストンピン嵌入孔3からの上部潤滑油の排出を防止す
ることができ、これによりピストンピン2と嵌入孔3の
上面の摩耗の確実な防止が可能となる。
According to the first aspect of the present invention, it is possible to prevent the upper lubricating oil from being discharged from the piston pin insertion hole 3 due to the explosion pressure, thereby ensuring the wear of the upper surfaces of the piston pin 2 and the insertion hole 3. Prevention is possible.

【0019】請求項2の発明によると、潤滑油の導入効
果を高めることができる。
According to the second aspect of the invention, the effect of introducing the lubricating oil can be enhanced.

【0020】請求項3、4、5の発明によると、潤滑油
の導入効果を更に高めることができる。
According to the third, fourth and fifth aspects of the invention, the effect of introducing the lubricating oil can be further enhanced.

【0021】請求項6の発明によると、燃料カム21と
燃料タペット26との摺接部27への潤滑油供給による
摩耗防止効果を期待できる。
According to the sixth aspect of the present invention, an effect of preventing abrasion can be expected by supplying lubricating oil to the sliding contact portion 27 between the fuel cam 21 and the fuel tappet 26.

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

【図1】 ピストンの縦断面図である。FIG. 1 is a longitudinal sectional view of a piston.

【図2】 図1のII−II断面拡大図である。FIG. 2 is an enlarged cross-sectional view taken along the line II-II of FIG.

【図3】 別の実施例を示す図1に対応する図面であ
る。
FIG. 3 is a drawing corresponding to FIG. 1 showing another embodiment.

【図4】 別の実施例のピストンの側面図である。FIG. 4 is a side view of another embodiment of the piston.

【図5】 図4のV−V断面略図である。FIG. 5 is a schematic cross-sectional view taken along line VV of FIG. 4;

【図6】 別の実施例を示す縦断面図である。FIG. 6 is a longitudinal sectional view showing another embodiment.

【図7】 図6のVII−VII断面略図である。7 is a schematic sectional view taken along the line VII-VII of FIG. 6;

【符号の説明】[Explanation of symbols]

1 ピストン 2 ピストンピン 3 ピストンピン嵌入孔 4 燃焼室 5 潤滑油溝 9 潤滑油導入孔 12 ピストンスカート 13 切欠 16 縦型カム軸 17 上端部 18 シリンダブロック 20 油孔 24 切欠 25 燃料噴射ポンプ 26 燃料タペット 27 摺接部 DESCRIPTION OF SYMBOLS 1 Piston 2 Piston pin 3 Piston pin insertion hole 4 Combustion chamber 5 Lubricating oil groove 9 Lubricating oil introduction hole 12 Piston skirt 13 Notch 16 Vertical cam shaft 17 Upper end 18 Cylinder block 20 Oil hole 24 Notch 25 Fuel injection pump 26 Fuel tappet 27 Sliding part

───────────────────────────────────────────────────── フロントページの続き (72)発明者 中島 正之 大阪府大阪市北区茶屋町1番32号 ヤンマ ーディーゼル株式会社内 Fターム(参考) 3G013 BA04 BC03 BC27 BD01 BD32 CA05  ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masayuki Nakajima 1-32 Chaya-cho, Kita-ku, Osaka-shi, Osaka F-term (reference) 3G013 BA04 BC03 BC27 BD01 BD32 CA05

Claims (6)

【特許請求の範囲】[Claims] 【請求項1】 ピストンのピストンピン嵌入孔に、反燃
焼室側へ偏倚して潤滑油溝を形成したことを特徴とする
エンジンの潤滑装置。
1. A lubricating device for an engine, wherein a lubricating oil groove is formed in a piston pin insertion hole of a piston so as to be deviated toward the combustion chamber side.
【請求項2】 ピストンピン嵌入孔の反燃焼室側に潤滑
油導入孔を穿設した、請求項1に記載のエンジンの潤滑
装置。
2. The engine lubrication device according to claim 1, wherein a lubricating oil introduction hole is formed on a side of the piston pin insertion hole opposite to the combustion chamber.
【請求項3】 ピストンスカートの側部にピストンピン
嵌入孔に連通する潤滑油導入切欠を設けた、請求項2に
記載のエンジンの潤滑装置。
3. The engine lubricating device according to claim 2, wherein a lubricating oil introduction notch communicating with the piston pin fitting hole is provided on a side portion of the piston skirt.
【請求項4】 ピストンスカートの側部にピストンピン
嵌入孔に連通する潤滑油導入切欠を設けた、請求項1に
記載のエンジンの潤滑装置。
4. The engine lubrication device according to claim 1, wherein a lubricating oil introduction notch communicating with the piston pin insertion hole is provided on a side portion of the piston skirt.
【請求項5】 ピストンピン嵌入孔の反燃焼室側に潤滑
油導入孔を穿設するとともに、ピストンスカートの側部
にピストンピン嵌入孔に連通する潤滑油導入切欠を設け
たことを特徴とするエンジンの潤滑装置。
5. A lubricating oil introduction hole is formed in the piston pin insertion hole on a side opposite to the combustion chamber, and a lubrication oil introduction cutout communicating with the piston pin insertion hole is provided in a side portion of the piston skirt. Engine lubrication device.
【請求項6】 縦型カム軸の上端部に潤滑油圧力を供給
し、上記カム軸を支承するシリンダのカム軸穴の下端の
シリンダに、カム軸の燃料カムと燃料噴射ポンプの燃料
タペットとの摺接部に潤滑油を流下させる切欠を設けた
ことを特徴とするエンジンの潤滑装置。
6. A lubricating oil pressure is supplied to an upper end of a vertical camshaft, and a fuel cam of a camshaft and a fuel tappet of a fuel injection pump are supplied to a cylinder at a lower end of a camshaft hole of a cylinder supporting the camshaft. A notch for allowing lubricating oil to flow down in the sliding contact portion of the engine.
JP29368699A 1999-10-15 1999-10-15 Lubricating device for engine Pending JP2001115811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29368699A JP2001115811A (en) 1999-10-15 1999-10-15 Lubricating device for engine

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Application Number Priority Date Filing Date Title
JP29368699A JP2001115811A (en) 1999-10-15 1999-10-15 Lubricating device for engine

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JP2001115811A true JP2001115811A (en) 2001-04-24

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109681621A (en) * 2019-01-07 2019-04-26 浙江康思特动力机械有限公司 Tappet lubrication assistant structure

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109681621A (en) * 2019-01-07 2019-04-26 浙江康思特动力机械有限公司 Tappet lubrication assistant structure

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