JPS6189964A - Piston for internal-combusiton engine - Google Patents

Piston for internal-combusiton engine

Info

Publication number
JPS6189964A
JPS6189964A JP59211235A JP21123584A JPS6189964A JP S6189964 A JPS6189964 A JP S6189964A JP 59211235 A JP59211235 A JP 59211235A JP 21123584 A JP21123584 A JP 21123584A JP S6189964 A JPS6189964 A JP S6189964A
Authority
JP
Japan
Prior art keywords
piston
piston crown
lubricating oil
cooling
cooled
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
JP59211235A
Other languages
Japanese (ja)
Inventor
Kunihiko Shimoda
下田　邦彦
Yozo Tosa
土佐　陽三
Keizo Goto
後藤　敬造
Hiroshi Oikawa
洋 及川
Akio Ishida
明男 石田
Shiro Shiino
椎野　始郎
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
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Motors Corp
Mitsubishi Heavy Industries 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 Mitsubishi Motors Corp, Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Motors Corp
Priority to JP59211235A priority Critical patent/JPS6189964A/en
Publication of JPS6189964A publication Critical patent/JPS6189964A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
    • F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
    • F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
    • F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0015—Multi-part pistons
    • F02F3/0023—Multi-part pistons the parts being bolted or screwed together
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To prevent a piston lower part from being cooled as well as to reduce a loss of friction, by installing a heat insulating layer in position between a piston crown and the piston lower part, while installing a cooling space for a flow of lubricating oil, inside the piston crown. CONSTITUTION:Cooling space 56-58 are installed in the inner part of a piston crown 52, making lubricating oil flow from an oil inlet 54 to an oil outlet 55 by way of a peripheral cooling part 56, a passage 58 and a central cooling apart 57, thus the piston crown is cooled. And, a heat insulating plate 61 and a heat insulating tube 62 are installed in space between the piston crown 52 and a piston lower part 51. With this constitution, the piston crown 52 is cooled, lowering its surface temperature and reducing a degree of NOx content to be produced, while cooling of the piston lower part is checked and viscosity of the lubricating oil on the surface is reduced to some extent without entailing any drop in temperature of a sliding surface 59 and, what is more, a loss of friction is reduced.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は内燃機関のピストンに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a piston for an internal combustion engine.

〔従来の技術〕[Conventional technology]

第２図に従来の内燃機関のピストン及びその冷却装置を
示す。図において、クランクケース１１はシリンダライ
ナ１２を支持し、上部にシリンダヘッド１３を持ってい
る。シリンダライナ１２の内面をピストン１４が摺動す
る。シリンダライナ１２、シリンダヘッド１３及びピス
トン１４で燃焼室１５を形成する。クランクケース１１
には潤滑油のメインギヤラリ２１があシ、そこからの潤
滑油をピストン１４に向って噴射するオイルジェットノ
ズル２２を取付けている。FIG. 2 shows a conventional internal combustion engine piston and its cooling device. In the figure, a crankcase 11 supports a cylinder liner 12 and has a cylinder head 13 on the top. A piston 14 slides on the inner surface of the cylinder liner 12. A combustion chamber 15 is formed by a cylinder liner 12, a cylinder head 13, and a piston 14. crank case 11
There is a main gear lary 21 for lubricating oil, and an oil jet nozzle 22 for injecting lubricating oil from there toward the piston 14 is attached.

第３図にピストン構造を示す。アルミニウム合金製のピ
ストン下部３１にアルミニウム合金製または鋼製のピス
トンクラウン３２をピストンクラウン３２の内側に設け
たねじ部３３によシ取付けている。ピストン下部３１に
オイル人口３４及びオイル出口３５を設けている。ここ
で、オイル人口３４は周辺冷却部３６に通じており、オ
イル出口３５は中央冷却部３７に通じている。さらに周
辺冷却部３６と中央冷却部３７は径方向に数個所設けら
れた連結通路３８で連絡している。また。Figure 3 shows the piston structure. A piston crown 32 made of aluminum alloy or steel is attached to a piston lower part 31 made of aluminum alloy by a threaded portion 33 provided inside the piston crown 32. An oil port 34 and an oil outlet 35 are provided in the lower piston 31. Here, the oil outlet 34 leads to a peripheral cooling part 36 and the oil outlet 35 leads to a central cooling part 37. Further, the peripheral cooling section 36 and the central cooling section 37 are communicated through connection passages 38 provided at several locations in the radial direction. Also.

ピストン下部３１にはピストン１４の往復運動をクラン
ク軸の回転運動にかえるさいに生じるスラスト力をシリ
ンダライナ１２に伝えながら摺動する摺動面３９を持つ
。The lower piston 31 has a sliding surface 39 that slides while transmitting thrust force generated when converting the reciprocating motion of the piston 14 into rotational motion of the crankshaft to the cylinder liner 12.

第４図に燃焼中の燃焼室の断面を示す。シリンダヘッド
１３に設けられた燃料噴射弁４１から高い圧力で噴射さ
れた燃料は燃料噴霧な形成する。Figure 4 shows a cross section of the combustion chamber during combustion. The fuel injected at high pressure from the fuel injection valve 41 provided in the cylinder head 13 forms fuel spray.

さらにその燃料噴霧は燃焼室１５内の高温の空気によシ
着火し燃焼して、噴霧火炎４２となってピストンクラウ
ン３２の表面に衝突したのち燃焼室１５内に拡散して行
く。Further, the fuel spray is ignited and combusted by the high temperature air in the combustion chamber 15, becomes a spray flame 42, collides with the surface of the piston crown 32, and then diffuses into the combustion chamber 15.

作用について説明すると、第２図に示したオイルジェッ
トノズル２２から噴射された潤滑油は第３図のオイル人
口３４から周辺冷却部３６にはいり、ピストンクラウン
３２の周辺部を冷却する。To explain the operation, the lubricating oil injected from the oil jet nozzle 22 shown in FIG. 2 enters the peripheral cooling section 36 from the oil port 34 shown in FIG. 3, and cools the peripheral part of the piston crown 32.

さらに、潤滑油は連絡通路３８から中央冷却部３７には
いシ、ピストンクラウン３２の中央部を冷却してオイル
出口３５から流出する。この結果。Further, the lubricating oil flows from the communication passage 38 to the central cooling section 37, cools the central portion of the piston crown 32, and flows out from the oil outlet 35. As a result.

ピストンクララフ３２０表面温度は低下する。ところで
、高速ディーゼル機関がトラック用に使用される場合、
排気公害規制を受けることになるが。The surface temperature of the piston claruff 320 decreases. By the way, when high-speed diesel engines are used for trucks,
It will be subject to exhaust pollution regulations.

中でもＮＯｘの規制がきびしい。このＮＯｘの生成に対
して第４図に示すように噴霧火炎４２はピストンクラウ
ン３２の表面に衝突するため、ピストンクララフ３２０
表面温度ＴＷと生成ＮｏＸの濃度には第５図に示すよう
な関係がある。即ち、Ｔｗを下げるとＮＯｘ濃度を下げ
ることができる。Among these, NOx regulations are particularly strict. In response to this NOx generation, the spray flame 42 collides with the surface of the piston crown 32 as shown in FIG.
There is a relationship between the surface temperature TW and the concentration of generated NoX as shown in FIG. That is, by lowering Tw, the NOx concentration can be lowered.

〔考案が解決しようとする問題点〕[Problem that the invention attempts to solve]

上記のものには次の欠点がある。 The above has the following drawbacks.

第５図に示したように、ピストンクララフ３２０表面温
度Ｔｗを下げるとＮＯｘ濃度を下げることができるため
、多量の潤滑油をオイルジェットノズル２２から噴射し
、ピストンクラウン３２を冷却している。このため、第
３図に示す従来のピストン１４ではピストンクラウン３
２だげでなく周辺冷却部３６及び中央冷却部３７を構成
するピストン下部３１も同時に冷却されることになる。As shown in FIG. 5, since the NOx concentration can be lowered by lowering the surface temperature Tw of the piston crown 320, a large amount of lubricating oil is injected from the oil jet nozzle 22 to cool the piston crown 32. Therefore, in the conventional piston 14 shown in FIG.
Not only the piston 2 but also the piston lower part 31 constituting the peripheral cooling part 36 and the central cooling part 37 are cooled at the same time.

その結果、摺動面３９の温度が低下し表面の潤滑油温度
が低下して粘度が高くなシ、シリンダライナ１２との間
の摩擦損失が増大して燃費を悪化する不具合を生じてい
る。As a result, the temperature of the sliding surface 39 decreases, the temperature of the lubricating oil on the surface decreases, and the friction loss between the sliding surface 39 and the cylinder liner 12, which has a high viscosity, increases, resulting in a problem that worsens fuel efficiency.

〔問題点を解決するだめの手段〕[Failure to solve the problem]

本発明の目的は上記の点に着目し、ピストンクラウンの
表面温度を低下させるさいに、ピストン下部が冷却され
るのを防ぎ、摩擦損失の増大を防いで燃費を改善できる
ピストンを提供することであシ、その特徴とするところ
は、潤滑油で冷却される内燃機関のピストンにおいて、
ピストンクラウンとピストン下部との間に設けられた断
熱層、上記ピストンクラウン内に設けられ潤滑油が流入
して流出する冷却空間を備えたことである。An object of the present invention is to provide a piston that can prevent the lower part of the piston from being cooled when lowering the surface temperature of the piston crown, prevent increase in friction loss, and improve fuel efficiency. The feature of the reed is that in the piston of an internal combustion engine that is cooled with lubricating oil,
This includes a heat insulating layer provided between the piston crown and the lower part of the piston, and a cooling space provided within the piston crown into which lubricating oil flows in and out.

〔作　用〕[For production]

この場合は、ピストンクラウンが潤滑油によシ冷却され
ても、ピストン下部は冷却されず摺動面５９の温度は下
がることなく２表面の潤滑油の粘度が低下し摩擦損失が
低下する。In this case, even if the piston crown is cooled by the lubricating oil, the lower part of the piston is not cooled and the temperature of the sliding surface 59 does not decrease, and the viscosity of the lubricating oil on the two surfaces decreases, reducing friction loss.

本発明はトラック用ディーゼル機関２発電用ディーゼル
機関に適用できる。The present invention can be applied to a truck diesel engine or a two-power generating diesel engine.

〔実施例〕〔Example〕

以下図面を参照して本発明による実施例につき説明する
。Embodiments of the present invention will be described below with reference to the drawings.

第１′図は本発明による１実施例のピストンを示す断面
図である。FIG. 1' is a sectional view showing one embodiment of a piston according to the present invention.

図において、アルミニウム合金製のピストン下部５１に
アルミニウム合金製または鋼製のピストンクラウン５２
をピストンクラウン５２の中央部に設けたねじ部にナツ
ト６４を締付けることによシ取付ける。ピストンクラウ
ン５２とピストン下部５１０間にはジルコニア等熱伝導
率の低い材料で作った断熱板６１を挿入する。ピストン
クラウン５２の中央突出部とピストン下部５１０間にも
断熱筒６２を挿入する。In the figure, a piston crown 52 made of aluminum alloy or steel is attached to a piston lower part 51 made of aluminum alloy.
is attached by tightening a nut 64 to a threaded portion provided in the center of the piston crown 52. A heat insulating plate 61 made of a material with low thermal conductivity such as zirconia is inserted between the piston crown 52 and the piston lower part 510. A heat insulating cylinder 62 is also inserted between the central protrusion of the piston crown 52 and the lower piston 510.

ピストン下部５１に断熱材料でできた断熱Ａ？イｆ６５
を取付け、断熱パイゾロ５及び断熱板６１゜ピストンク
ラウン５２を通じるオイル入口５．１及びピストンクラ
ウン５２中央部にオイル出口５５を設ける。Insulation A made of heat insulating material in the lower part of the piston 51? i f65
An oil inlet 5.1 is provided through the piston crown 52, and an oil outlet 55 is provided at the center of the piston crown 52.

ここでオイル人口５４はピストンクラウン５２内の周辺
冷却部５６に通じておシ、オイル出口５５は中央冷却部
５７に通じている。さらに周辺冷却部５６と中央冷却部
５７は径方向に数個所設けられた連絡通路５８で連通し
ている。ピストン下部５１には摺動面５９を持つ。Here, the oil outlet 54 leads to a peripheral cooling part 56 in the piston crown 52, and the oil outlet 55 leads to a central cooling part 57. Further, the peripheral cooling section 56 and the central cooling section 57 communicate with each other through communication passages 58 provided at several locations in the radial direction. The lower piston 51 has a sliding surface 59.

上記構成の場合の作用について述べる。The operation in the case of the above configuration will be described.

第２図に示したオイルジェットノズル２２から噴射され
た潤滑油は第１図のオイル人口５４から周辺冷却部５６
にはいシ、連絡通路５８から中央冷却部５７をへて、ピ
ストンクラウン５２を冷却した後、オイル出口５５から
流出する。The lubricating oil injected from the oil jet nozzle 22 shown in FIG. 2 is transferred from the oil port 54 shown in FIG.
After passing through the central cooling section 57 from the communication passage 58 and cooling the piston crown 52, the oil flows out from the oil outlet 55.

〔発明の効果〕〔Effect of the invention〕

上述の場合には次の効果がある。 The above case has the following effects.

オイルジェットノズル２２からの潤滑油によりピストン
クラウン５２は冷却され表面温度Ｔｗが下がって、生成
されるＮＯｘ濃度が低くなる。The piston crown 52 is cooled by the lubricating oil from the oil jet nozzle 22, the surface temperature Tw is lowered, and the NOx concentration generated is lowered.

ところで、ピストンクラウン５２が冷却されても断熱板
６１の効果によシピストン下部５１が冷却されることが
ない。また、潤滑油のピストンクラウン５２への入口、
出口もそれぞれ断熱・ぐイブ６５及び断熱筒６２によシ
断熱されている。By the way, even if the piston crown 52 is cooled, the lower piston 51 will not be cooled due to the effect of the heat insulating plate 61. Also, an inlet of lubricating oil to the piston crown 52,
The outlets are also insulated by a heat insulating tube 65 and a heat insulating cylinder 62, respectively.

この結果、ピストン下部５１はオイルジェット１　ノズ
ル２２からの潤滑油によシ冷却されることがなく、摺動
面５９の温度は下がることがなく１表面の潤滑油の粘度
が低下し摩擦損失か低下して燃費が改善される。As a result, the piston lower part 51 is not cooled by the lubricating oil from the oil jet 1 and nozzle 22, and the temperature of the sliding surface 59 does not drop, and the viscosity of the lubricating oil on the surface 1 decreases, resulting in friction loss. This reduces fuel consumption and improves fuel efficiency.

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

第１図は本発明による１実施例のピストンを示す断面図
、第２図は従、来の内燃機関のピストン及びその冷却装
置を示す説明図、第３図は第２図のピストンを示す断面
図、第４図は燃焼中の燃焼室を示す断面図、第５図はピ
ストンクラウンの表面温度ＴｗとＮＯｘ＠度との関係を
示す線図である。 ５１・・・ピストン下部、ビ２・・・ピストンクラウン
。 ５４・・・オイル入口、５５・・・オイル出口、５６・
・・周辺冷却部、５７・・・中央冷却部、５＼・・・摺
動面。 ６１・・・断熱板、６２・・・断熱筒、６５・・・断熱
ノソイグ。 ′″Ａ′＋図　　　ＪＪ−１２ｑ）’ｙ壕、ｒ２−％訃
ソうラクン ≦／−−−び印ち４ 乙ｂ−・斯熟ｊ句 士２区 Ａ′４１ｆｆｉ Ｔｗ　　　　’ｃFIG. 1 is a sectional view showing a piston according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a piston of a conventional internal combustion engine and its cooling device, and FIG. 3 is a sectional view showing the piston of FIG. 2. FIG. 4 is a sectional view showing the combustion chamber during combustion, and FIG. 5 is a diagram showing the relationship between the surface temperature Tw of the piston crown and NOx degrees. 51... Piston lower part, Bi2... Piston crown. 54...Oil inlet, 55...Oil outlet, 56.
...Peripheral cooling section, 57...Central cooling section, 5\...Sliding surface. 61...Insulation board, 62...Insulation tube, 65...Insulation nosoigu. '''A'+Fig.

Claims (1)

【特許請求の範囲】[Claims] １、潤滑油で冷却される内燃機関のピストンにおいて、
ピストンクラウンとピストン下部との間に設けられた断
熱層、上記ピストンクラウン内に設けられ潤滑油が流入
して流出する冷却空間を備えたことを特徴とするピスト
ン。1. In the piston of an internal combustion engine cooled by lubricating oil,
A piston comprising: a heat insulating layer provided between a piston crown and a lower portion of the piston; and a cooling space provided within the piston crown into which lubricating oil flows in and out.
JP59211235A 1984-10-11 1984-10-11 Piston for internal-combusiton engine Pending JPS6189964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59211235A JPS6189964A (en) 1984-10-11 1984-10-11 Piston for internal-combusiton engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59211235A JPS6189964A (en) 1984-10-11 1984-10-11 Piston for internal-combusiton engine

Publications (1)

Publication Number Publication Date
JPS6189964A true JPS6189964A (en) 1986-05-08

Family

ID=16602523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59211235A Pending JPS6189964A (en) 1984-10-11 1984-10-11 Piston for internal-combusiton engine

Country Status (1)

Country Link
JP (1) JPS6189964A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8813713B2 (en) 2010-12-22 2014-08-26 Caterpillar Inc. Piston with cylindrical wall

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8813713B2 (en) 2010-12-22 2014-08-26 Caterpillar Inc. Piston with cylindrical wall

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