JP2002174123A - Combustion chamber for diesel engine - Google Patents
Combustion chamber for diesel engineInfo
- Publication number
- JP2002174123A JP2002174123A JP2000371674A JP2000371674A JP2002174123A JP 2002174123 A JP2002174123 A JP 2002174123A JP 2000371674 A JP2000371674 A JP 2000371674A JP 2000371674 A JP2000371674 A JP 2000371674A JP 2002174123 A JP2002174123 A JP 2002174123A
- Authority
- JP
- Japan
- Prior art keywords
- trench
- combustion chamber
- main
- combustion
- combustion gas
- 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
Classifications
-
- 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
- F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
- F02B23/069—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets characterised by its eccentricity from the cylinder axis
-
- 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
- F02B23/0618—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 having in-cylinder means to influence the charge motion
- F02B23/0621—Squish flow
-
- 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
- F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
- F02B23/0687—Multiple bowls in the piston, e.g. one bowl per fuel spray jet
-
- 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
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ディーゼルエン
ジンの燃焼室に関するもので、副燃焼室を有する形態の
ディーゼルエンジンに利用できる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion chamber of a diesel engine, and can be used for a diesel engine having an auxiliary combustion chamber.
【０００２】[0002]
【従来の技術】ピストンヘッドに、メイントレンチ部と
サイドトレンチ部とからなるトレンチをクローバー葉形
態に形成する技術は既に知られている（特開平８ー２０
００７２号公報）。2. Description of the Related Art A technique for forming a trench composed of a main trench portion and a side trench portion in the form of a cloverleaf in a piston head is already known (Japanese Patent Laid-Open No. 8-20).
0072).
【０００３】[0003]
【発明が解決しようとする課題】副燃焼室を有する形態
のエンジンでは、副燃焼室で着火された一次燃焼ガス
が、噴出口から主燃焼室へ向けて噴出されて二次燃焼さ
れるため、この主燃焼室のピストンヘッドのトレンチ形
態は、この主燃焼室での二次燃焼性に影響される。この
ピストンヘッドのトレンチ形態は、一次燃焼ガスの噴流
抵抗等による混合性をよくし、拡散を良好に行わせるこ
とが要求される。In an engine having a sub-combustion chamber, the primary combustion gas ignited in the sub-combustion chamber is ejected from an ejection port toward the main combustion chamber and is subjected to secondary combustion. The form of the trench in the piston head of the main combustion chamber is affected by the secondary combustibility in the main combustion chamber. The trench shape of the piston head is required to improve the mixing property due to the resistance of the primary combustion gas to the jet and to make the diffusion excellent.
【０００４】[0004]
【課題を解決するための手段】請求項１に記載の発明
は、シリンダヘッド１の副燃焼室２から主燃焼室３へ噴
出される燃焼ガスを案内するピストンヘッド４に、この
燃焼ガスの噴出方向に沿うメイントレンチ５部とこの先
端部両側のサイドトレンチ６部とからなるトレンチ７を
クローバー葉形態に形成し、このサイドトレンチ６部は
中央部のメイントレンチ５部側で深く左右両側方に渡っ
て順次浅くした傾斜面８に形成したことを特徴とするデ
ィーゼルエンジンの燃焼室の構成とする。According to the first aspect of the present invention, the combustion gas is injected into a piston head 4 for guiding the combustion gas injected from a sub combustion chamber 2 of a cylinder head 1 to a main combustion chamber 3. A trench 7 composed of a main trench 5 along the direction and side trenches 6 on both sides of the tip is formed in the form of a cloverleaf. The combustion chamber of the diesel engine is characterized in that the inclined surface 8 is formed so as to be gradually shallower across the combustion chamber.
【０００５】請求項２に記載の発明は、シリンダヘッド
１の副燃焼室２から主燃焼室３へ噴出される燃焼ガスを
案内するピストンヘッド４に、この燃焼ガスの噴出方向
に沿うメイントレンチ５部とこの先端部両側のサイドト
レンチ６部とからなるトレンチ７を略半円形状形態に形
成し、このメイントレンチ５には、中央部を浅くし左右
両側部を深くした中高状の分流底面９を形成したことを
特徴とするディーゼルエンジンの燃焼室の構成とする。The invention described in claim 2 is characterized in that a piston head 4 for guiding combustion gas injected from a sub-combustion chamber 2 of a cylinder head 1 to a main combustion chamber 3 has a main trench 5 extending along a direction in which the combustion gas is injected. And a trench 7 formed of a side trench 6 on both sides of the front end portion are formed in a substantially semicircular shape, and the main trench 5 has a middle-level diversion bottom surface 9 having a shallow central portion and a deep left and right side portion. And a combustion chamber of a diesel engine.
【０００６】請求項３に記載の発明は、シリンダヘッド
１の副燃焼室２から主燃焼室３へ噴出される燃焼ガスを
案内するピストンヘッド４に、この噴出部から放射方向
に沿う放射トレンチ１０と、これら各放射トレンチ１０
間のトレンチ綾縁１１とからなるチャビティー１２を扇
子形態に形成したことを特徴とするディーゼルエンジン
の燃焼室の構成とする。According to a third aspect of the present invention, the piston head 4 for guiding the combustion gas ejected from the sub-combustion chamber 2 of the cylinder head 1 to the main combustion chamber 3 has a radiation trench 10 extending radially from the ejection portion. And each of these radiation trenches 10
A combustion chamber of a diesel engine is characterized in that a cavity 12 including a trench twill edge 11 therebetween is formed in a fan shape.
【０００７】[0007]
【発明の効果】請求項１に記載の発明は、トレンチ７を
案内される燃焼ガスは、メイントレンチ５部を深く案内
されるため、この噴出流における抵抗を少なくすること
ができ、混合性をよくすることができる。しかも、この
メイントレンチ５部を噴出されて混合された燃焼ガス
は、この深いメイントレンチ５部から左右両側方に渡っ
て順次浅くなるように傾斜する傾斜面８に沿って案内さ
れて、主燃焼室３内へ拡散されて、この主燃焼室３内で
の二次燃焼を速やかに行わせることができる。According to the first aspect of the present invention, since the combustion gas guided in the trench 7 is guided deeply in the main trench 5, the resistance in the jet flow can be reduced, and the mixing property can be improved. Can be better. Moreover, the combustion gas ejected from the main trench 5 and mixed therein is guided along the inclined surface 8 which is gradually inclined from both sides of the deep main trench 5 to the left and right sides, so that the main combustion is performed. The secondary combustion is diffused into the chamber 3 and the secondary combustion in the main combustion chamber 3 can be promptly performed.
【０００８】請求項２に記載の発明は、メイントレンチ
５に噴出して案内される燃焼ガスは、中高状の分流底面
９に分流案内されて、先端部で左右両側の半円形状のサ
イドトレンチ６部を前方側方へ拡散されるものであるか
ら、左右へ均等な拡散を行わせることができ、無駄な流
れを少なくして、直進性高めて速やかな拡散を行わせ
る。According to a second aspect of the present invention, the combustion gas ejected and guided to the main trench 5 is diverted and guided to the middle and lower diverting bottom surface 9, and has a semicircular side trench on both left and right sides at the tip end. Since the six parts are diffused to the front side, uniform diffusion can be performed to the left and right, and useless flow is reduced, straightness is enhanced, and rapid diffusion is performed.
【０００９】請求項３に記載の発明は、キャビティー１
２が、放射トレンチ１０とトレンチ稜縁１１とによる扇
子状形態に形成されるため、この要部に噴出される燃焼
ガスは、各放射トレンチ１０を案内されて、直進され、
噴流抵抗を少なくさせ、拡散を円滑に行わせることがで
きる。According to a third aspect of the present invention, the cavity 1
2 is formed in a fan-like form by the radiation trench 10 and the trench edge 11, so that the combustion gas ejected to the main part is guided through each radiation trench 10 and goes straight,
The jet resistance can be reduced, and the diffusion can be performed smoothly.
【００１０】[0010]
【発明の実施の形態】この発明は、副燃焼室を有するデ
ィーゼルエンジンの燃焼室、乃至ピストンヘッドに実施
できる。ディーゼルエンジンの概要構成を図面に示す符
号を用いて説明する。エンジンボディー１３には、シリ
ンダ１４、クランク室１５、カム室１６，１７、水冷室
１８等を形成する。この底部にはオイルパン１９を取付
け、上部にはシリンダヘッド１を取付ける。クランク軸
２０の回転によりピストンロッド２１を介して連結され
るピストン２２が、シリンダ１４に嵌合されて往復動さ
れる。カム室１６には燃料を噴出させる燃料噴射ポンプ
２３を駆動するポンプカム軸２４が設けられる。カム室
１７にはタペットロッド２５を駆動するタペットカム軸
２６が設けられる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be applied to a combustion chamber or a piston head of a diesel engine having an auxiliary combustion chamber. A general configuration of a diesel engine will be described using reference numerals shown in the drawings. The engine body 13 includes a cylinder 14, a crank chamber 15, cam chambers 16, 17, a water cooling chamber 18, and the like. The oil pan 19 is attached to the bottom, and the cylinder head 1 is attached to the top. The piston 22 connected via the piston rod 21 by the rotation of the crankshaft 20 is fitted to the cylinder 14 and reciprocates. The cam chamber 16 is provided with a pump camshaft 24 for driving a fuel injection pump 23 for ejecting fuel. The cam chamber 17 is provided with a tappet cam shaft 26 for driving the tappet rod 25.
【００１１】又、シリンダヘッド１には、ピストンヘッ
ド４に対向して副燃焼室２を形成すると共に、吸、排気
弁２７を有する吸、排気路２８を連通する。２９は燃料
噴射ノズル、３０はグロープラグ、３１はタペットアー
ムである。この副燃焼室２のピストンヘッド４側には、
噴出口３２が形成されて、副燃焼室２において噴射ノズ
ル２９から吹込まれた燃料を着火させ、この一次燃焼の
燃焼ガスを噴出口３２からシリンダ１４内のピストンヘ
ッド４部とシリンダヘッド１との間に形成される主燃焼
室３内へ噴出させて、吸気弁の開きによって吸入される
吸気のもとで二次燃焼させて、ピストン２２を作動させ
る。この排気は排気弁２７の開きによって排気路２８か
ら行わせる。An auxiliary combustion chamber 2 is formed in the cylinder head 1 so as to face the piston head 4 and communicates with an intake / exhaust passage 28 having an intake / exhaust valve 27. 29 is a fuel injection nozzle, 30 is a glow plug, and 31 is a tappet arm. On the piston head 4 side of the sub-combustion chamber 2,
An injection port 32 is formed to ignite fuel injected from the injection nozzle 29 in the sub-combustion chamber 2, and the combustion gas of the primary combustion is transmitted from the injection port 32 to the piston head 4 in the cylinder 14 and the cylinder head 1. The piston 22 is ejected into the main combustion chamber 3 formed therebetween, and secondary combustion is performed under the intake air sucked by opening the intake valve to operate the piston 22. This exhaust is performed from the exhaust path 28 by opening the exhaust valve 27.
【００１２】ここにおいて、主として図１〜図３に基づ
いて、請求項１に記載の発明は、シリンダヘッド１の副
燃焼室２から主燃焼室３へ噴出される燃焼ガスを案内す
るピストンヘッド４に、この燃焼ガスの噴出方向に沿う
メイントレンチ５部とこの先端部両側のサイドトレンチ
６部とからなるトレンチ７をクローバー葉形態に形成
し、このサイドトレンチ６部は中央部のメイントレンチ
５部側で深く左右両側方に渡って順次浅くした傾斜面８
に形成したことを特徴とするディーゼルエンジンの燃焼
室の構成とする。Here, based mainly on FIGS. 1 to 3, the invention according to claim 1 is based on a piston head 4 for guiding combustion gas injected from a sub-combustion chamber 2 of a cylinder head 1 to a main combustion chamber 3. Then, a trench 7 is formed in the form of a cloverleaf, comprising a main trench 5 along the jetting direction of the combustion gas and side trenches 6 on both sides of the tip, and the side trench 6 is formed in a central main trench 5 Inclined surface 8 that is deeper on the side and shallower sequentially on both sides
The structure of a combustion chamber of a diesel engine characterized by being formed as described above.
【００１３】これによって、トレンチ７を案内される燃
焼ガスは、メイントレンチ５部を深く案内されるため、
この噴出流における抵抗を少なくすることができ、混合
性をよくすることができる。しかも、このメイントレン
チ５部を噴出されて混合された燃焼ガスは、この深いメ
イントレンチ５部から左右両側方に渡って順次浅くなる
ように傾斜する傾斜面８に沿って案内されて、主燃焼室
３内へ拡散されて、この主燃焼室３内での二次燃焼を速
やかに行わせることができる。As a result, the combustion gas guided through the trench 7 is guided deeply through the main trench 5 so that
The resistance in the jet flow can be reduced, and the mixing property can be improved. Moreover, the combustion gas ejected from the main trench 5 and mixed therein is guided along the inclined surface 8 which is gradually inclined from both sides of the deep main trench 5 to the left and right sides, so that the main combustion is performed. The secondary combustion is diffused into the chamber 3 and the secondary combustion in the main combustion chamber 3 can be promptly performed.
【００１４】ここで、副燃焼室２から主燃焼室３へ連通
する噴出口３２はホットプラグに形成されて、ピストン
ヘッド４の一側部に偏位してのぞむように設けられる。
又、この噴出口３２から噴出される燃焼ガスを案内する
ピストンヘッド４の中央部から噴出口３２側寄りに偏位
して構成される。Here, an injection port 32 communicating from the sub-combustion chamber 2 to the main combustion chamber 3 is formed as a hot plug, and is provided so as to be deflected to one side of the piston head 4.
In addition, the piston is deflected from the center of the piston head 4 for guiding the combustion gas ejected from the ejection port 32 toward the ejection port 32 side.
【００１５】このメイントレンチ５は、噴出口３２の直
下部からピストンヘッド１の中央部側へ向けて所定幅
（例えば１２ｍｍ）、及び深さ（０．８ｍｍ）にして形
成される。サイドトレンチ６は、このメイントレンチ５
の先端側左右両側部に略円形状に形成されて、トレンチ
７の全体としてはクローバー葉状、乃至双葉状の形態に
形成される。又、このサイドトレンチ６は、メイントレ
ンチ５との交差部で深く（１．７ｍｍ）形成し、左右両
側方に渡って順次浅くして傾斜（５度）の傾斜面８に形
成する。The main trench 5 is formed to have a predetermined width (for example, 12 mm) and a depth (0.8 mm) from directly below the jet port 32 toward the center of the piston head 1. The side trench 6 is formed by the main trench 5
The trench 7 is formed as a whole in a cloverleaf shape or a double-leaf shape. The side trench 6 is formed deeply (1.7 mm) at the intersection with the main trench 5, and is formed shallowly (5 degrees) on the inclined surface 8 so as to be gradually shallower on both left and right sides.
【００１６】噴出口３２から噴出される一次燃焼ガス
は、メイントレンチ５に沿って噴出されて、先端部に至
ると深くなってサイドトレンチ６部に渡って左右に広く
拡散されるため、このメイントレンチ５における抵抗は
小さく、混合作用が行われ易くなる。このサイドトレン
チ６部では左右両方に渡って流れる燃焼ガスは、傾斜面
８に沿って主燃焼室３側へ押出されるように案内される
ため、拡散され易く、燃焼効率を高めることができる。The primary combustion gas ejected from the ejection port 32 is ejected along the main trench 5 and becomes deeper at the tip and diffuses widely right and left over the side trench 6. The resistance in the trench 5 is small, and the mixing action is easily performed. In the side trench 6, the combustion gas flowing both right and left is guided to be pushed toward the main combustion chamber 3 along the inclined surface 8, so that it is easily diffused and the combustion efficiency can be increased.
【００１７】次に、主として図５、図６に基づいて請求
項２に記載の発明は、シリンダヘッド１の副燃焼室２２
から主燃焼室３へ噴出される燃焼ガスを案内するピスト
ンヘッド４に、この燃焼ガスの噴出方向に沿うメイント
レンチ５部とこの先端部両側のサイドトレンチ６部とか
らなるトレンチ７を略半円形状形態に形成し、このメイ
ントレンチ５には、中央部を浅くし左右両側部を深くし
た中高状の分流底面９を形成したことを特徴とするディ
ーゼルエンジンの燃焼室の構成とする。Next, mainly referring to FIGS. 5 and 6, the invention according to claim 2 is directed to the auxiliary combustion chamber 22 of the cylinder head 1. FIG.
A piston head 4 for guiding the combustion gas ejected from the nozzle into the main combustion chamber 3 has a substantially semicircular trench 7 composed of a main trench 5 along the direction of ejection of the combustion gas and side trenches 6 on both sides of the tip. The main trench 5 is formed in a shape form, and the middle trench 5 is formed with a middle and high divergent bottom surface 9 having shallow central portions and deep left and right sides, thereby forming a combustion chamber of a diesel engine.
【００１８】これによって、メイントレンチ５に噴出し
て案内される燃焼ガスは、中高状の分流底面９に分流案
内されて、先端部で左右両側の半円形状のサイドトレン
チ６部を前方側方へ拡散されるものであるから、左右へ
均等な拡散を行わせることができ、無駄な流れを少なく
して、直進性高めて速やかな拡散を行わせる。As a result, the combustion gas ejected and guided to the main trench 5 is diverted and guided to the middle and diagonal diverting bottom surface 9, and the front and rear sides of the semi-circular side trench 6 at the left and right sides are forwardly diverted. Therefore, it is possible to perform uniform diffusion to the left and right, reduce unnecessary flow, increase straightness, and perform rapid diffusion.
【００１９】ここに、前記メイントレンチ５の底面に形
成される中高状の分流底面９は、メイントレンチ５の幅
の中央部に沿って三角状の稜縁３３を形成し、この稜縁
３３から左右両側端に渡って下り傾斜させて深く形成す
る。サイドトレンチ６は、このメイントレンチ５の先端
部側の左右両側方に半円形状に形成されて、トレンチ７
全体として略パラソル状に形成される。このサイドトレ
ンチ６の先端側縁３４は円弧状に形成されるが、基部側
縁３５は左右に直線状、乃至先端側へ窪む円弧状に形成
される。このサイドトレンチ６は前記メイントレンチ５
の両側部と略同深さに深く形成している。Here, the middle-distanced flow-dividing bottom surface 9 formed on the bottom surface of the main trench 5 forms a triangular ridge 33 along the center of the width of the main trench 5, and from this ridge 33. It is formed deeply by inclining down over both left and right edges. The side trench 6 is formed in a semicircular shape on both left and right sides on the tip end side of the main trench 5, and
It is formed in a substantially parasol shape as a whole. The tip side edge 34 of the side trench 6 is formed in an arc shape, while the base side edge 35 is formed in a right and left linear shape or an arc shape depressed toward the tip side. The side trench 6 is provided in the main trench 5
And is formed to the same depth as the both sides.
【００２０】噴出口３２から噴出される燃焼ガスは、メ
イントレンチ５部の基端部で稜縁３３で左右に分岐され
る。この分岐された燃焼ガスは分流底面９に沿って先端
側へ平行状に分流されて、左右各別に側方のサイドトレ
ンチ６部へ案内されながら、主燃焼室３へ拡散される。
このため主燃焼室３内の燃焼ガスの拡散は左右均等に行
われ、しかも各分流底面９によって案内される燃焼ガス
は、直進性によって速やかに行われ、サイドトレンチ６
部においても先端側縁３４に案内させて、基部側縁３５
への案内は小さくして無駄な流れや乱れを少なくして燃
焼を速やかに行わせる。The combustion gas ejected from the ejection port 32 branches right and left at a ridge 33 at the base end of the main trench 5. The branched combustion gas is diverted in parallel to the tip side along the diverging bottom surface 9 and diffused into the main combustion chamber 3 while being guided to the left and right side trenches 6 separately.
For this reason, the diffusion of the combustion gas in the main combustion chamber 3 is performed evenly on the left and right sides, and the combustion gas guided by each of the branch bottom surfaces 9 is rapidly performed by the straightness, and
The base portion is also guided by the distal side edge 34 so that the base side edge 35
The guide to the air is reduced to reduce wasteful flow and turbulence, and to promptly perform combustion.
【００２１】次に、主として図７、図８に基づいて請求
項３に記載の発明は、シリンダヘッド１の副燃焼室２か
ら主燃焼室３へ噴出される燃焼ガスを案内するピストン
ヘッド４に、この噴出部から放射方向に沿う放射トレン
チ１０と、これら各放射トレンチ１０間のトレンチ綾縁
１１とからなるキャビティー１２を扇子形態に形成した
ことを特徴とするディーゼルエンジンの燃焼室の構成と
する。Next, the invention according to claim 3 mainly based on FIGS. 7 and 8 is directed to a piston head 4 for guiding combustion gas injected from a sub combustion chamber 2 of a cylinder head 1 to a main combustion chamber 3. A combustion chamber of a diesel engine, wherein a cavity 12 comprising a radiation trench 10 extending in a radial direction from the ejection portion and a trench edge 11 between the radiation trenches 10 is formed in a fan shape. I do.
【００２２】これによって、キャビティー１２が、放射
トレンチ１０とトレンチ稜縁１１とによる扇子状形態に
形成されるため、この要部に噴出される燃焼ガスは、各
放射トレンチ１０を案内されて、直進され、噴流抵抗を
少なくさせ、拡散を円滑に行わせることができる。As a result, the cavity 12 is formed in a fan shape by the radiation trench 10 and the trench ridge 11, so that the combustion gas injected into the main part is guided through each radiation trench 10, It is possible to proceed straight, reduce jet resistance, and smoothly perform diffusion.
【００２３】ここに、キャビティー１２は扇子状形態に
して、この扇子の要部３６を前記噴出口３２部に対向さ
せて、各放射トレンチ１０及びトレンチ稜縁１１部は各
角度Ａを約１０度間隔に配置形成している。このため各
放射トレンチ１０の幅は要部３６側で狭く、端側で広く
なるように形成され、かつこの各放射トレンチ１０の深
さは要部３６側では深くし先端側で順次浅く形成され
る。Here, the cavity 12 is in the form of a fan, and the main portion 36 of the fan is opposed to the jet port 32. Each of the radiation trenches 10 and the trench ridge 11 has an angle A of about 10 degrees. They are arranged at intervals of degrees. For this reason, the width of each radiation trench 10 is formed so as to be narrow at the main portion 36 side and wide at the end side, and the depth of each radiation trench 10 is formed to be deep at the main portion 36 side and shallow at the tip side sequentially. You.
【００２４】噴出口３２から要部３６部に噴出される燃
焼ガスは、各トレンチ稜縁１１部間の放射トレンチ１０
部に案内されて、この先端部から主燃焼室３へ直進案内
されると共に均等に拡散される。曲進案内部がないため
燃焼ガスの噴流抵抗が小さく、円滑な拡散効果をうる。The combustion gas ejected from the ejection port 32 to the main portion 36 is supplied to the radiation trench 10 between the trench edges 11.
And is guided straight from the tip to the main combustion chamber 3 and is evenly diffused. Since there is no curved guide part, the jet resistance of the combustion gas is small, and a smooth diffusion effect is obtained.
【００２５】更に、主として図９、図４に基づいて、ブ
ローバイガス中のオイルを分離するために、このブロー
バイガス通路３７にフアン３８を設けたものである。前
記シリンダヘッド１のヘッドカバー３９に、クランク室
１５と連通するブローバイガス通路３７を形成してい
る。このブローバイガス通路３７はパイプ４０を経て吸
気路（吸気マニホールド）、又は機外へ開放させる。４
１はタペット室である。Furthermore, a fan 38 is provided in the blow-by gas passage 37 for separating oil in the blow-by gas mainly based on FIGS. 9 and 4. A blow-by gas passage 37 communicating with the crank chamber 15 is formed in the head cover 39 of the cylinder head 1. The blow-by gas passage 37 is opened through a pipe 40 to an intake passage (intake manifold) or outside the machine. 4
1 is a tappet room.
【００２６】このブローバイガス通路３７にフアン軸４
３周りに回転自在のフアン３８を設けて、この通路３７
を流れるブローバイガスによって回転される。このフア
ン３８の外周部に対向してブローバイガス通路３７に
は、オイルミストを分離する分離口４２を設けて、タペ
ット室４１に連通させる。The blow-by gas passage 37 has a fan shaft 4
3 and a rotatable fan 38 is provided around this passage 37.
Is rotated by the blow-by gas flowing through. A separation port 42 for separating oil mist is provided in the blow-by gas passage 37 so as to face the outer peripheral portion of the fan 38 and communicate with the tappet chamber 41.
【００２７】クランク室１５等で発生したオイルミスト
を含むブローバイガスは、このブローバイガス通路３７
を上昇させるが、このブローバイガスの圧力によってフ
アン３８を回転する。このフアン３８に付着されたオイ
ルミストは遠心力で外方の分離口４２を通してタペット
室４１へ分離放出される。これによってパイプ４０へ排
出されるブローバイガスをオイルミストの少ない状態と
することができる。The blow-by gas containing oil mist generated in the crank chamber 15 and the like is supplied to the blow-by gas passage 37.
The fan 38 is rotated by the pressure of the blow-by gas. The oil mist attached to the fan 38 is separated and discharged to the tappet chamber 41 through the outer separation port 42 by centrifugal force. As a result, the blow-by gas discharged to the pipe 40 can be reduced in oil mist.
【図１】ピストンヘッド部の平面図。FIG. 1 is a plan view of a piston head.
【図２】その側断面図。FIG. 2 is a side sectional view thereof.
【図３】その正断面図。FIG. 3 is a front sectional view thereof.
【図４】そのエンジン全体図。FIG. 4 is an overall view of the engine.
【図５】一部別実施例を示すピストンヘッド部の平面図
と、一部の断面図。5A and 5B are a plan view and a partial cross-sectional view of a piston head portion showing another embodiment.
【図６】その斜視図。FIG. 6 is a perspective view thereof.
【図７】一部別実施例を示すピストンヘッド部の平面
図。FIG. 7 is a plan view of a piston head showing a partly different embodiment.
【図８】その側面図。FIG. 8 is a side view thereof.
【図９】一部別実施例を示すヘッドカバー部の断面図。FIG. 9 is a cross-sectional view of a head cover showing a partially different embodiment.
１ シリンダヘッド ２ 副燃焼室 ３ 主燃焼室 ４ ピストンヘッド ５ メイントレンチ ６ サイドトレンチ ７ トレンチ ８ 傾斜面 ９ 分流底面 １０ 放射トレンチ １１ トレンチ稜縁 １２ キャビティー DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Subcombustion chamber 3 Main combustion chamber 4 Piston head 5 Main trench 6 Side trench 7 Trench 8 Inclined surface 9 Dividing bottom surface 10 Radiation trench 11 Trench edge 12 Cavity
Claims (3)
焼室３へ噴出される燃焼ガスを案内するピストンヘッド
４に、この燃焼ガスの噴出方向に沿うメイントレンチ５
部とこの先端部両側のサイドトレンチ６部とからなるト
レンチ７をクローバー葉形態に形成し、このサイドトレ
ンチ６部は中央部のメイントレンチ５部側で深く左右両
側方に渡って順次浅くした傾斜面８に形成したことを特
徴とするディーゼルエンジンの燃焼室。1. A piston head (4) for guiding combustion gas ejected from a sub combustion chamber (2) of a cylinder head (1) to a main combustion chamber (3) is provided with a main trench (5) extending in a direction in which the combustion gas is ejected.
And a side trench 6 on both sides of the tip portion are formed in the form of a cloverleaf, and the side trench 6 is deeper on the side of the main trench 5 in the center and is gradually shallower on the left and right sides. A combustion chamber for a diesel engine, wherein the combustion chamber is formed on a surface 8.
焼室３へ噴出される燃焼ガスを案内するピストンヘッド
４に、この燃焼ガスの噴出方向に沿うメイントレンチ５
部とこの先端部両側のサイドトレンチ６部とからなるト
レンチ７を略半円形状形態に形成し、このメイントレン
チ５には、中央部を浅くし左右両側部を深くした中高状
の分流底面９を形成したことを特徴とするディーゼルエ
ンジンの燃焼室。2. A piston head 4 for guiding combustion gas injected from a sub-combustion chamber 2 of a cylinder head 1 to a main combustion chamber 3 is provided with a main trench 5 along a direction in which the combustion gas is injected.
And a trench 7 formed of a side trench 6 on both sides of the front end portion are formed in a substantially semicircular shape, and the main trench 5 has a middle-level diversion bottom surface 9 having a shallow central portion and a deep left and right side portion. A combustion chamber for a diesel engine, characterized in that a combustion chamber is formed.
焼室３へ噴出される燃焼ガスを案内するピストンヘッド
４に、この噴出部から放射方向に沿う放射トレンチ１０
と、これら各放射トレンチ１０間のトレンチ綾縁１１と
からなるキャビティー１２を扇子形態に形成したことを
特徴とするディーゼルエンジンの燃焼室。3. A piston head 4 for guiding combustion gas injected from a sub-combustion chamber 2 of a cylinder head 1 to a main combustion chamber 3 is provided with a radiation trench 10 extending radially from the injection section.
A combustion chamber for a diesel engine, wherein a cavity 12 consisting of a trench 11 between the radiation trenches 10 is formed in a fan shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000371674A JP2002174123A (en) | 2000-12-06 | 2000-12-06 | Combustion chamber for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000371674A JP2002174123A (en) | 2000-12-06 | 2000-12-06 | Combustion chamber for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002174123A true JP2002174123A (en) | 2002-06-21 |
Family
ID=18841359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000371674A Pending JP2002174123A (en) | 2000-12-06 | 2000-12-06 | Combustion chamber for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002174123A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019045315A1 (en) * | 2017-08-30 | 2019-03-07 | 엘에스엠트론 주식회사 | Swirl chamber-type diesel engine |
| WO2019045314A1 (en) * | 2017-08-30 | 2019-03-07 | 엘에스엠트론 주식회사 | Swirl chamber-type diesel engine |
-
2000
- 2000-12-06 JP JP2000371674A patent/JP2002174123A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019045315A1 (en) * | 2017-08-30 | 2019-03-07 | 엘에스엠트론 주식회사 | Swirl chamber-type diesel engine |
| WO2019045314A1 (en) * | 2017-08-30 | 2019-03-07 | 엘에스엠트론 주식회사 | Swirl chamber-type diesel engine |
| US11085360B2 (en) | 2017-08-30 | 2021-08-10 | Ls Mtron Ltd. | Swirl chamber-type diesel engine |
| US11085359B2 (en) | 2017-08-30 | 2021-08-10 | Ls Mtron Ltd. | Swirl chamber-type diesel engine |
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