JPS6075716A - Cylinder head of diesel engine - Google Patents

Cylinder head of diesel engine

Info

Publication number
JPS6075716A
JPS6075716A JP58184158A JP18415883A JPS6075716A JP S6075716 A JPS6075716 A JP S6075716A JP 58184158 A JP58184158 A JP 58184158A JP 18415883 A JP18415883 A JP 18415883A JP S6075716 A JPS6075716 A JP S6075716A
Authority
JP
Japan
Prior art keywords
cylinder
flow
air
turbulence
piston
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
JP58184158A
Other languages
Japanese (ja)
Inventor
Nobuji Eguchi
江口　展司
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.)
Hino Motors Ltd
Original Assignee
Hino Motors Ltd
Hino Jidosha Kogyo KK
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 Hino Motors Ltd, Hino Jidosha Kogyo KK filed Critical Hino Motors Ltd
Priority to JP58184158A priority Critical patent/JPS6075716A/en
Publication of JPS6075716A publication Critical patent/JPS6075716A/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
    • 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
    • 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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)

Abstract

PURPOSE:To enhance turbulence of air and facilitate mixing of air and fuel, by providing a projection for deflecting a part of main flow of suction air sucked into a cylinder toward auxiliary flow at a valve opening portion on a lower surface of a cylinder head opposite to a top surface of a piston. CONSTITUTION:A top surface 3 of a piston 2 slidably inserted in a cylinder liner 1 is bored to form a combustion chamber 4. An insert 7 having a projection 6 projecting toward the piston 2 is embedded in a valve opening portion on a lower surface of a cylinder head 5 fixed at an upper end of the cylinder liner 1, that is, on a surface opposed to the top surface 3 of the piston 2. Thus, a part of main flow A of suction air sucked through a suction port 8 into a cylinder 9 is guided as a deflected flow C toward auxiliary flow B. As a result, the deflected flow C collides with the auxiliary flow B to generate turbulence, and the turbulence collides with the main flow A to be amplified. Accordingly, strong air turbulence is generated in the cylinder 9, and may be sufficiently mixed with fuel.

Description

【発明の詳細な説明】 本発明は、ディーゼルエンジンのシリンダへ。[Detailed description of the invention] The present invention applies to diesel engine cylinders.

１・゛に関するものである。This concerns 1.゛.

ディーゼルエンジンの燃焼効−１１を向」ニさせて燃料
消費率、υ１気特性、出力等を向」ニさせるためには、
シリンダに％を人した空気と燃料とを充分に４２合させ
ることがイｊ効であり、これを満足させるために、従来
から吸気ボートの形状を改善し、あるいは、吸気ボート
の開目方向を改良してシリンダ内における空気の乱れを
向トさせている。しかしながら、このように吸気ボート
の形状、開「コ方向を改善するもみでは必ずしも充分な
乱れをｔｌｌることかできず、改善の余地が残されてい
た。In order to improve the combustion efficiency of a diesel engine and improve its fuel consumption rate, υ1-temperature characteristics, output, etc.,
It is effective to bring the air and fuel into the cylinder to a sufficient level, and in order to achieve this, the shape of the intake boat has been improved or the opening direction of the intake boat has been changed. This has been improved to reduce air turbulence within the cylinder. However, by improving the shape of the intake boat and the opening direction, it is not always possible to sufficiently reduce the turbulence, and there is still room for improvement.

本発明は、このような実状に鑑みてなされたものであり
、従来は放置されていたシリンダヘッドの下面（ピスト
ン項面との対向面）を改良することにより、吸気効率を
損なうことなくシリンダ内における空気の乱れを強化し
て空気と燃ネ゛１との程合性を向−トさせることを目的
としている。The present invention was made in view of the above circumstances, and by improving the lower surface of the cylinder head (the surface facing the piston head surface), which had been left untouched in the past, it is possible to improve the inside of the cylinder without impairing intake efficiency. The purpose is to improve the compatibility between the air and the fuel by increasing the turbulence in the air.

斯る目的を達成するために本発明では、ピストンの頂面
と対向するシリンダヘッドド面の弁間部分に、シリンダ
内にガＬ人する吸気の主流の一部を副流に向って偏向さ
せる突起を形成することにより、吸気ボー（・からシリ
ンダ内に流入する空気（吸気）を従来の主流及び副流の
他に、主流の−ｒ！ｌ＋による偏向流に分割してこれを
シリンダ内で合流（衝突）させることで空気の乱れを強
化して燃料との１に合性を向−ヒさせるようにしたもの
である。In order to achieve such an object, the present invention deflects a part of the main flow of intake air flowing into the cylinder toward a side flow in the valve-to-valve portion of the cylinder head surface facing the top surface of the piston. By forming the protrusion, the air (intake air) flowing into the cylinder from the intake bow () is divided into the conventional main flow and side flow, as well as a deflection flow due to -r!l+ of the main flow, and this is divided into By merging (colliding), the turbulence of the air is strengthened and the merging with the fuel is promoted.

以下に本発明の詳細な説明する。The present invention will be explained in detail below.

図は本発明の一実施例を示すものであり、シリンタライ
ナ１に慴動自在に嵌挿したピストン２の頂面３には燃焼
室４を凹設している。前記シリングライナ１の１一端に
１δ１足したシリンダへ・ンド５のド面、つまり、ビス
Ｉ・ン２の頂面３との対向面におけるｊｔ　ＩＩＩ部分
にはピストンに向って突出する突起６をり１１えたスチ
ール製のインサート７を埋設固定することにより、吸気
ポート８からシリンダ９内に流入する吸気の主流への一
部を副流Ｂに向って偏向案内させるように構成している
。Ｃはこの偏向によって生成された偏向流、１０は排気
ポート、１１は燃用噴躬ノスル、１２は吸気弁である。The figure shows an embodiment of the present invention, in which a combustion chamber 4 is recessed in the top surface 3 of a piston 2 that is slidably inserted into a cylinder liner 1. A protrusion 6 protruding toward the piston is provided on the surface of the cylinder end 5, which is one end of the cylinder liner 1 plus 1δ1, that is, on the jt III portion of the surface facing the top surface 3 of the screw I. By embedding and fixing a steel insert 7 with a diameter of 11, a portion of the intake air flowing into the cylinder 9 from the intake port 8 into the main stream is deflected and guided toward the side stream B. C is a deflected flow generated by this deflection, 10 is an exhaust port, 11 is a fuel injection nostle, and 12 is an intake valve.

１−記のように構成したシリンダへンドを備えたディー
セルエンジンにおいて、吸入行程では吸気ブ「１２か第
１図に示すように開ブｆし、ピストン２が図中下方に向
って移動するので、エアクリーナで痒過された空気が吸
気ポート８からシリング内に流入する。In a diesel engine equipped with a cylinder head configured as shown in 1-, during the intake stroke, the intake valve ``12'' opens as shown in Figure 1, and the piston 2 moves downward in the figure. The air filtered by the air cleaner flows into the cylinder from the intake port 8.

このとき、吸気のほとんとは主流Ａとなってシリンダ９
内を旋回し、残りの空気が副流Ｂとなってシリンダ９内
に流入する。そして、前記主流Ａの一部がシリンダヘッ
ト５の下面に位置する突起６に？ｉ突して偏向流Ｃとな
り、前記副流Ｂと衝突して乱れを生じる。又、この乱れ
が一１流Ａとの冶突によって増幅されるので、シリンダ
９内には強い空気の乱れが発生するため、Ｆ、才′１噴
射ノスル１１から噴射された燃料が空気と充分に混合す
る。このために、燃料の蒸発が促進されると共に空気利
用率が高くなるので完全燃焼が行なわれ、出力、排気特
性等が向上する。At this time, most of the intake air becomes the mainstream A and cylinder 9
The remaining air flows into the cylinder 9 as a side stream B. Then, a part of the main flow A reaches the protrusion 6 located on the lower surface of the cylinder head 5? The deflected flow C then collides with the side flow B, causing turbulence. Also, as this turbulence is amplified by the collision with the first flow A, strong air turbulence is generated within the cylinder 9, so that the fuel injected from the F, first injection nozzle 11 is not sufficiently connected to the air. Mix with For this reason, fuel evaporation is promoted and the air utilization rate is increased, so that complete combustion is performed and output, exhaust characteristics, etc. are improved.

ト記実施例ではスチールで構成されたインサート７をシ
リングヘッド５の下面に埋設しているが、このインサー
ト７を半導体セラミンク等で構成して始動時に突起６を
加熱させることでエンジンの始動性を向４二させること
もでき、あるいは、突起６をシリングへ・ンド５のｆＦ
ｊ材と回−・の素材で構成してもよい。In the embodiment described above, an insert 7 made of steel is embedded in the lower surface of the sill head 5, but this insert 7 is made of semiconductor ceramic or the like to heat the protrusion 6 at the time of starting, thereby improving the startability of the engine. Alternatively, the protrusion 6 can be placed in the direction 42, or the protrusion 6 can be
It may be constructed of J material and circuit material.

以１−説明したように本発明によれば、シリング内に流
入する吸気の主流の一部をシリングへ、ドのＦ面に設け
た突起で副流に向って偏向させるように構成しているの
で、シリング内に発生する空気の乱れが強くなり、燃焼
室における空気の乱れも強くなって燃料と空気とが充分
に混合し、空気利用率が高くなると共に、燃ネ゛ｌの蒸
発が促進されてディーセルエンジンの出力、粘気特性、
燃料消費率が改善される。As described above, according to the present invention, a part of the main flow of intake air flowing into the cylinder is deflected into the cylinder by the protrusion provided on the F side of the cylinder toward the side flow. Therefore, the air turbulence that occurs inside the cylinder becomes stronger, and the air turbulence in the combustion chamber also becomes stronger, allowing sufficient mixing of fuel and air, increasing the air utilization rate, and promoting evaporation of fuel fuel. Diesel engine output, viscosity characteristics,
Fuel consumption rate is improved.

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

第１図は本発明の一実施例を會１えたディーゼルエンジ
ンの四部の略示断面図、第２図は第１図の■■−■■断
面図である。 １・・・シリングライナ　２・・・ピストン３・・・頂
面　、４・・・燃焼室 ５・・・シリンダヘット　６・・・突起７・・・インサ
ート８・・・吸気ポート９・・・シリング　ｌＯ・・・
ｔＪｌ’　％ボート１２・・・吸気弁 特３乍出願人 目野自動車工業株式会社 第１図FIG. 1 is a schematic cross-sectional view of four parts of a diesel engine incorporating an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■■■■■ in FIG. 1...Silling liner 2...Piston 3...Top surface, 4...Combustion chamber 5...Cylinder head 6...Protrusion 7...Insert 8...Intake port 9... Schilling lO...
tJl' % boat 12... Intake valve special 3 之 Applicant Meno Jidosha Kogyo Co., Ltd. Figure 1

Claims (1)

【特許請求の範囲】[Claims] ビス）・ンの頂１ｎ）と対向するシリンダへント下面の
弁間部分に、シリンダ内に流入する吸気の主流の一部を
副流に向って偏向させる突起を形成したことを特徴とす
るディーゼルエンジンのシリンダヘット。A diesel engine characterized in that a protrusion is formed in a portion between the valves on the lower surface of the cylinder head facing the top 1n) of the cylinder head to deflect a part of the main flow of intake air flowing into the cylinder toward a side stream. engine cylinder head.
JP58184158A 1983-09-30 1983-09-30 Cylinder head of diesel engine Pending JPS6075716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58184158A JPS6075716A (en) 1983-09-30 1983-09-30 Cylinder head of diesel engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58184158A JPS6075716A (en) 1983-09-30 1983-09-30 Cylinder head of diesel engine

Publications (1)

Publication Number Publication Date
JPS6075716A true JPS6075716A (en) 1985-04-30

Family

ID=16148375

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58184158A Pending JPS6075716A (en) 1983-09-30 1983-09-30 Cylinder head of diesel engine

Country Status (1)

Country Link
JP (1) JPS6075716A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49116407A (en) * 1973-03-12 1974-11-07
JPS56167812A (en) * 1980-05-28 1981-12-23 Mazda Motor Corp Combustion chamber of engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49116407A (en) * 1973-03-12 1974-11-07
JPS56167812A (en) * 1980-05-28 1981-12-23 Mazda Motor Corp Combustion chamber of engine

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