JPH0335490B2 - - Google Patents

Info

Publication number
JPH0335490B2
JPH0335490B2 JP60015178A JP1517885A JPH0335490B2 JP H0335490 B2 JPH0335490 B2 JP H0335490B2 JP 60015178 A JP60015178 A JP 60015178A JP 1517885 A JP1517885 A JP 1517885A JP H0335490 B2 JPH0335490 B2 JP H0335490B2
Authority
JP
Japan
Prior art keywords
intake passage
intake
passage
cylinder
auxiliary
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.)
Expired - Lifetime
Application number
JP60015178A
Other languages
Japanese (ja)
Other versions
JPS61175228A (en
Inventor
Takayuki Tanaka
Hideji Okazaki
Yoshimichi Tanaka
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.)
Mazda Motor Corp
Original Assignee
Mazda Motor 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 Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP60015178A priority Critical patent/JPS61175228A/en
Publication of JPS61175228A publication Critical patent/JPS61175228A/en
Publication of JPH0335490B2 publication Critical patent/JPH0335490B2/ja
Granted 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
    • F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
    • F02B31/08—Modifying induction systems for imparting a rotation to the charge in the cylinder having multiple air inlets
    • 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)

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は、吸気通路が低負荷時に閉じる制御弁
を備えた主吸気通路と、補助吸気通路とから構成
され、低負荷から高負荷に至る全ての運転領域、
特に低負荷域における燃焼性を改善しうるエンジ
ンの吸気装置に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention consists of a main intake passage equipped with a control valve that closes when the load is low, and an auxiliary intake passage. all driving areas,
The present invention relates to an engine intake system that can improve combustibility particularly in a low load range.

（従来技術） 従来から、吸気通路が高負荷用と低負荷用とか
ら構成されたエンジンの吸気装置において、特
に、低負荷運転時の燃焼性を改善するために、低
負荷時には、高負荷用吸気通路内に設けた制御弁
を閉じ、低負荷用吸気通路のみから吸気するよう
にし、燃焼室内にシリンダ周壁に沿つて流れる吸
気の旋回流（スワール）を生成させることが行な
われている。すなわち、この構成は、いわゆるデ
ユアルインダクシヨン方式と称せられるものであ
るが、上記スワール発生効果をより一層向上させ
るために、例えば、特開昭58−187519号公報に示
されるように、シリンダボア中心に対してオフセ
ツトされる低負荷用吸気通路の断面形状を、長軸
がシリンダヘツド下端面に平行となる偏平形状と
し、この偏平な低負荷用吸気通路を上流から下流
に向つて水平方向幅が小さくなるように絞るよう
なことが行なわれている。(Prior art) Conventionally, in an engine intake system in which the intake passage is configured with a high-load passage and a low-load passage, in order to improve combustibility especially during low-load operation, the high-load passage A control valve provided in the intake passage is closed so that air is taken only from the low-load intake passage, thereby creating a swirl of intake air flowing along the cylinder peripheral wall within the combustion chamber. That is, this configuration is called a dual induction system, but in order to further improve the swirl generation effect, as shown in Japanese Patent Application Laid-Open No. 58-187519, a The cross-sectional shape of the low-load intake passage offset from the cylinder head is made into a flat shape with the long axis parallel to the lower end surface of the cylinder head, and the horizontal width of this flat low-load intake passage becomes smaller from upstream to downstream. Things are being done to narrow it down.

ところが、上記公報に示されるごとき装置にお
いては、低負荷用吸気通路のポートのオフセツト
のために、通路を急激に曲げると、水平方向幅が
小さくなるように絞られていることと相俟つて、
吸気抵抗が大きくなり、吸気の充填効率が低下す
る問題点がある。しかも、低負荷用吸気通路は滑
らかに屈曲もしくは湾曲させなければ、吸気流に
乱れが生じ、シリンダ周方向のスワールが十分に
生成できなくなる。 However, in the device shown in the above-mentioned publication, due to the port offset of the low-load intake passage, if the passage is suddenly bent, the horizontal width is narrowed,
There is a problem that the intake resistance increases and the intake air filling efficiency decreases. Moreover, unless the low-load intake passage is smoothly bent or curved, the intake air flow will be disturbed and a sufficient swirl in the cylinder circumferential direction will not be generated.

（発明の目的） 本発明は、上記問題点を解消するもので、シリ
ンダの接線方向に指向させた低負荷用としての補
助吸気通路の断面積を流れ方向において変えるこ
とにより、吸気抵抗を増大することなく、強いス
ワールを生成することができ、燃焼性の向上を図
ることができるエンジンの吸気装置を提供するこ
とを目的とする。(Object of the Invention) The present invention solves the above problems by increasing the intake resistance by changing the cross-sectional area of the auxiliary intake passage for low-load use oriented in the tangential direction of the cylinder in the flow direction. It is an object of the present invention to provide an intake device for an engine that can generate a strong swirl and improve combustibility without causing any combustibility.

（発明の構成） 本発明は、スロツトル弁下流の吸気通路が主吸
気通路と補助吸気通路とから構成され、上記主吸
気通路には低負荷時に閉じる制御弁を介設し、上
記補助吸気通路はその上流端を上記スロツトル弁
下流で、かつ上記制御弁上流の上記主吸気通路に
開口し、下流端を上記制御弁下流で、かつ上記主
吸気通路の吸気弁直上流に開口させてなるエンジ
ンの吸気装置において、上記補助吸気通路の下流
端開口をシリンダの接線方向に指向させるととも
に、この補助吸気通路のシリンダ内周側の通路断
面積をシリンダ外周側の通路断面積よりも、上流
になるにしたがつて徐々に大きくなるように構成
したものである。(Structure of the Invention) In the present invention, the intake passage downstream of the throttle valve is composed of a main intake passage and an auxiliary intake passage, a control valve that closes at low load is interposed in the main intake passage, and the auxiliary intake passage is The upstream end thereof is opened downstream of the throttle valve and into the main intake passage upstream of the control valve, and the downstream end thereof is opened downstream of the control valve and immediately upstream of the intake valve of the main intake passage. In the intake device, the downstream end opening of the auxiliary intake passage is oriented in the tangential direction of the cylinder, and the passage cross-sectional area of the auxiliary intake passage on the inner circumference side of the cylinder is made closer to the upstream side than the passage cross-sectional area on the outer circumference side of the cylinder. Therefore, it is configured to gradually increase in size.

この構成により、補助吸気通路のシリンダ内周
側を通る吸気の流速が増大し、補助吸気流全体の
シリンダ接線方向への偏向の作用が得られる。 With this configuration, the flow velocity of the intake air passing through the cylinder inner peripheral side of the auxiliary intake passage increases, and the effect of deflecting the entire auxiliary intake air flow in the cylinder tangential direction is obtained.

（実施例） 第１図〜第４図は本発明の一実施例を示し、シ
リンダ１とシリンダヘツド２により燃焼室３が形
成され、この燃焼室３には吸気ポート４と排気ポ
ート５が設けられている。吸気ポート４にはエン
ジンの回転と同期して開閉動作させられる吸気弁
６が設けられ、かつ、吸気通路７が接続されてい
る。この吸気通路７はシリンダヘツド２に連結さ
れた制御弁胴８、吸気マニホールド９およびスロ
ツトル弁１０を有した気化室１１などにより形成
されている。(Embodiment) FIGS. 1 to 4 show an embodiment of the present invention, in which a combustion chamber 3 is formed by a cylinder 1 and a cylinder head 2, and this combustion chamber 3 is provided with an intake port 4 and an exhaust port 5. It is being The intake port 4 is provided with an intake valve 6 that opens and closes in synchronization with the rotation of the engine, and is connected to an intake passage 7. The intake passage 7 is formed by a control valve body 8 connected to the cylinder head 2, an intake manifold 9, a vaporization chamber 11 having a throttle valve 10, and the like.

上記吸気通路７は高負荷用としての主吸気通路
７ａと低負荷用としての補助吸気通路７ｂとから
構成され、両者間には仕切壁７ｃが設けられてい
る。主吸気通路７ａには制御弁胴８内に設けられ
た低負荷時に閉じる制御弁１２が介設され、ま
た、補助吸気通路７ｂはその上流端がスロツトル
弁１０下流で、かつ上記制御弁１２上流の主吸気
通路７ａに補助吸気通路開口７ｄとして開口し、
下流端が制御弁１２下流で、かつ、主吸気通路７
ａの吸気弁６直上流に補助吸気ポート７ｅとして
開口している。また、主吸気通路７ａは比較的断
面積が大きく形成され、しかも、その下流端が燃
焼室３に対しシリンダ１の軸心方向に開口し、高
負荷時には吸気抵抗が小さく、かつ、ソワールを
制御するように構成されている。補助吸気通路７
ｂは比較的断面積が小さく、その下流端の補助吸
気ポート７ｅはシリンダ１の接線方向を指向して
開口させられ、燃焼室３への吸気の流速を上げ、
かつスワールが生成されるように構成されてい
る。 The intake passage 7 is composed of a main intake passage 7a for high-load use and an auxiliary intake passage 7b for low-load use, and a partition wall 7c is provided between the two. A control valve 12 provided in a control valve body 8 and closed at low load is interposed in the main intake passage 7a, and the auxiliary intake passage 7b has an upstream end downstream of the throttle valve 10 and upstream of the control valve 12. The main intake passage 7a is opened as an auxiliary intake passage opening 7d,
The downstream end is downstream of the control valve 12 and the main intake passage 7
The auxiliary intake port 7e is opened immediately upstream of the intake valve 6a. In addition, the main intake passage 7a is formed with a relatively large cross-sectional area, and its downstream end opens in the axial direction of the cylinder 1 with respect to the combustion chamber 3, so that the intake resistance is small during high loads, and the soir is controlled. is configured to do so. Auxiliary intake passage 7
b has a relatively small cross-sectional area, and the auxiliary intake port 7e at its downstream end is opened oriented in the tangential direction of the cylinder 1 to increase the flow rate of intake air into the combustion chamber 3.
and is configured to generate swirl.

そして、本発明では、上記補助吸気通路７ｂ
は、第３図、第４図からも明らかなように、断面
形状が水平方向に長軸を有する偏平形状であつ
て、そのシリンダ１内周側の通路断面積をシリン
ダ１外周側の通路断面積よりも、上流になるにし
たがつて徐々に大きくなるように構成されてい
る。すなわち、補助吸気通路７ｂのシリンダ内周
側の通路壁ｉは補助吸気通路７ｂのシリンダ外周
側の通路壁ｏに比べ上流側になる程、垂直方向寸
法が大きく形成されている。 In the present invention, the auxiliary intake passage 7b
As is clear from FIGS. 3 and 4, the cross-sectional shape is a flat shape with a long axis in the horizontal direction, and the cross-sectional area of the passage on the inner circumference side of the cylinder 1 is the cross-sectional area of the passage on the outer circumference side of the cylinder 1. The area is designed to gradually increase as you move upstream. That is, the vertical dimension of the passage wall i on the cylinder inner circumferential side of the auxiliary intake passage 7b is made larger as it moves upstream compared to the passage wall o on the cylinder outer circumferential side of the auxiliary intake passage 7b.

また、上記主吸気通路７ａに介設された制御弁
１２はエンジンの負荷状態を検出してダイヤフラ
ム装置１３により制御されるようになつている。
すなわち、ダイヤフラム装置１３はスロツトル弁
１０下流の吸気通路７内の負圧導入路１４にて検
出し、リンク機構１５を介して制御弁１２を開閉
駆動するようになつている。また、シリンダヘツ
ド２と制御弁胴８および制御弁胴８と吸気マニホ
ールド９の間にはそれぞれガスケツト１６，１７
設けられている。 Further, a control valve 12 provided in the main intake passage 7a is controlled by a diaphragm device 13 by detecting the load condition of the engine.
That is, the diaphragm device 13 detects the negative pressure at the negative pressure introduction path 14 in the intake passage 7 downstream of the throttle valve 10, and drives the control valve 12 to open and close via the link mechanism 15. Further, gaskets 16 and 17 are provided between the cylinder head 2 and the control valve body 8, and between the control valve body 8 and the intake manifold 9, respectively.
It is provided.

次に、上記構成の作用を説明する。 Next, the operation of the above configuration will be explained.

低負荷時には、スロツトル弁１０の開度は小さ
く、従つて、その下流の吸気通路７内の負圧は大
きく、ダイヤフラム装置１３により制御弁１２が
閉じられており、吸気は補助吸気通路７ｂにてな
される。このとき、補助吸気通路７ｂは、シリン
ダ内周側の通路断面積がシリンダ外周側の通路断
面積よりも特に上流側において大きく形成されて
いるので、第１図に示すごとく断面積の大きいシ
リンダ内周側を通る補助吸気流Ｉが断面積の小さ
いシリンダ外周側を通る補助吸気流Ｏよりも、流
量、流速とも大きくなる。すなわち、実質的に吸
気をシリンダ接線方向に指向させる補助吸気通路
７ｂのシリンダ内周側の通路壁ｉに沿つて燃焼室
３内に吸気される補助吸気流Ｉが、強く、速い吸
気流となるため、強力なスワールの生成が可能と
なる。従つて、燃焼性、燃費の向上が図れる。 When the load is low, the opening degree of the throttle valve 10 is small, so the negative pressure in the intake passage 7 downstream thereof is large, the control valve 12 is closed by the diaphragm device 13, and the intake air is passed through the auxiliary intake passage 7b. It will be done. At this time, the auxiliary intake passage 7b is formed so that the passage cross-sectional area on the inner circumferential side of the cylinder is larger than the passage cross-sectional area on the outer circumferential side of the cylinder, especially on the upstream side. The auxiliary intake air flow I passing through the circumferential side has a larger flow rate and flow velocity than the auxiliary intake air flow O passing through the outer circumferential side of the cylinder having a small cross-sectional area. That is, the auxiliary intake air flow I that is taken into the combustion chamber 3 along the passage wall i on the inner peripheral side of the cylinder of the auxiliary intake passage 7b, which directs the intake air substantially in the cylinder tangential direction, becomes a strong and fast intake flow. Therefore, it is possible to generate a strong swirl. Therefore, combustibility and fuel efficiency can be improved.

次に高負荷時には、スロツトル弁１０の開度が
大きく、吸気通路７内の負圧は小さく、従つてダ
イヤフラム装置１３により制御弁１２は開き、吸
気は主として通路面積の大きい主吸気通路７ａを
通して行なわれ、スワールの生成は抑制されると
同時に小さな吸気抵抗にて高い充填効率にて吸気
がなされる。従つて、燃焼性、出力の向上が図れ
る。 Next, when the load is high, the opening degree of the throttle valve 10 is large and the negative pressure in the intake passage 7 is small, so the control valve 12 is opened by the diaphragm device 13, and intake is mainly performed through the main intake passage 7a, which has a large passage area. As a result, the generation of swirl is suppressed, and at the same time, air is taken in with high filling efficiency with small intake resistance. Therefore, combustibility and output can be improved.

なお、上記実施例では、１個の吸気ポート４に
対して吸気通路７が接続され、この吸気通路７の
一部において、主吸気通路７ａから補助吸気通路
７ｂを分岐したものを示したが、本発明は、シリ
ンダ毎に２個の吸気ポートを有し、各々の吸気ポ
ートに吸気通路が接続され、主吸気通路の集合部
から補助吸気通路が分岐するとともに、その下流
端が分岐した主吸気通路の一方の吸気弁直上流に
開口するようにした構成のもの等にも適用可能で
ある。 In the above embodiment, the intake passage 7 is connected to one intake port 4, and in a part of the intake passage 7, the auxiliary intake passage 7b is branched from the main intake passage 7a. The present invention has two intake ports for each cylinder, an intake passage is connected to each intake port, an auxiliary intake passage branches from a gathering part of the main intake passage, and the downstream end of the auxiliary intake passage branches into the branched main intake passage. It is also applicable to a structure in which the passage opens immediately upstream of one of the intake valves.

また、制御弁１２を制御する手段としては、実
施例のようなダイヤフラム装置１３を用いるもの
に限らず、エンジンの負荷状態を検知して作動す
る手段であれば如何なるものであつてもよい。 Further, the means for controlling the control valve 12 is not limited to one using the diaphragm device 13 as in the embodiment, but any means that operates by detecting the load condition of the engine may be used.

（発明の効果） 以上のように本発明によれば、主吸気通路の吸
気弁直上流に補助吸気通路の下流端を開口させた
ものにおいて、補助吸気通路をシリンダの接線方
向に指向させるとともに、この補助吸気通路のシ
リンダ内周側の通路断面積を上流になるにしたが
つて徐々にシリンダ外周側の通路断面積よりも大
きくしたことにより、実質的に吸気をシリンダ接
線方向に指向させるシリンダ内周側に流速の大き
い吸気流が形成でき、従つて、スワール生成能力
の向上が図れ、燃焼性、燃費等の向上が可能とな
るものである。(Effects of the Invention) As described above, according to the present invention, in the main intake passage in which the downstream end of the auxiliary intake passage is opened immediately upstream of the intake valve, the auxiliary intake passage is oriented in the tangential direction of the cylinder, and By making the cross-sectional area of the auxiliary intake passage on the inner circumferential side of the cylinder gradually larger than the cross-sectional area of the outer circumferential side of the cylinder as it moves upstream, the intake air is essentially directed in the tangential direction of the cylinder. An intake flow with a high flow velocity can be formed on the circumferential side, and therefore, the swirl generation ability can be improved, and combustibility, fuel efficiency, etc. can be 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によるエンジンの吸
気装置の部分断面平面図、第２図は同エンジンの
吸気装置の側断面図、第３図は第２図−線断
面図、第４図ａ，ｂ，ｃ，ｄはそれぞれ第２図の
ａ，ｂ，ｃ，ｄ線部分による補助吸気通路の断面
図である。 １……シリンダ、６……吸気弁、７……吸気通
路、７ａ……主吸気通路、７ｂ……補助吸気通
路、７ｄ……補助吸気通路開口、７ｅ……補助吸
気ポート、１０……スロツトル弁、１２……制御
弁。 FIG. 1 is a partially sectional plan view of an intake system of an engine according to an embodiment of the present invention, FIG. 2 is a side sectional view of the intake system of the same engine, FIG. 3 is a sectional view taken along the line of FIG. 2, and FIG. a, b, c, and d are cross-sectional views of the auxiliary intake passage taken along lines a, b, c, and d in FIG. 2, respectively; 1...Cylinder, 6...Intake valve, 7...Intake passage, 7a...Main intake passage, 7b...Auxiliary intake passage, 7d...Auxiliary intake passage opening, 7e...Auxiliary intake port, 10...Throttle Valve, 12...control valve.

Claims (1)

【特許請求の範囲】[Claims] １ スロツトル弁下流の吸気通路が主吸気通路と
補助吸気通路とから構成され、上記主吸気通路に
は低負荷時に閉じる制御弁を介設し、上記補助吸
気通路はその上流端を上記スロツトル弁下流で、
かつ上記制御弁上流の上記主吸気通路に開口し、
下流端を上記制御弁下流で、かつ上記主吸気通路
の吸気弁直上流に開口させてなるエンジンの吸気
装置において、上記補助吸気通路の下流端開口を
シリンダの接線方向に指向させるとともに、この
補助吸気通路のシリンダ内周側の通路断面積をシ
リンダ外周側の通路断面積よりも、上流になるに
したがつて徐々に大きくなるように構成したこと
を特徴とするエンジンの吸気装置。1. The intake passage downstream of the throttle valve is composed of a main intake passage and an auxiliary intake passage, and the main intake passage is provided with a control valve that closes at low load, and the auxiliary intake passage has its upstream end downstream of the throttle valve. in,
and opens into the main intake passage upstream of the control valve,
In an engine intake system in which the downstream end of the auxiliary intake passage is opened downstream of the control valve and the main intake passage is opened immediately upstream of the intake valve, the downstream end opening of the auxiliary intake passage is oriented in the tangential direction of the cylinder, and the auxiliary intake passage is oriented in the tangential direction of the cylinder. An intake system for an engine, characterized in that the cross-sectional area of the intake passage on the inner circumferential side of the cylinder becomes gradually larger toward the upstream side than the cross-sectional area of the passage on the outer circumferential side of the cylinder.
JP60015178A 1985-01-28 1985-01-28 Intake device of engine Granted JPS61175228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60015178A JPS61175228A (en) 1985-01-28 1985-01-28 Intake device of engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60015178A JPS61175228A (en) 1985-01-28 1985-01-28 Intake device of engine

Publications (2)

Publication Number Publication Date
JPS61175228A JPS61175228A (en) 1986-08-06
JPH0335490B2 true JPH0335490B2 (en) 1991-05-28

Family

ID=11881561

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60015178A Granted JPS61175228A (en) 1985-01-28 1985-01-28 Intake device of engine

Country Status (1)

Country Link
JP (1) JPS61175228A (en)

Also Published As

Publication number Publication date
JPS61175228A (en) 1986-08-06

Similar Documents

Publication Publication Date Title
JP2639721B2 (en) Combustion chamber of internal combustion engine
US5072583A (en) Exhaust system for internal combustion engines
JPH03264727A (en) Intake system for multiple valve engine
JPS641656B2 (en)
JP2639720B2 (en) Intake control device for internal combustion engine
JPH0335490B2 (en)
JPS6131147Y2 (en)
JPH0346183Y2 (en)
JPH0335492B2 (en)
JPH0649868Y2 (en) Engine throttle valve device
JPS6161918A (en) Air intake device of internal-combustion engine
JPS6350427Y2 (en)
JPS6128714A (en) Intake device of internal-combustion engine
JPH0528338Y2 (en)
JPS61167122A (en) Intake device of engine
JPS6321326A (en) Exhaust manifold for turbo supercharged engine
JPS6149129A (en) Intake device of internal-combustion engine
JPH0481522A (en) Intake device of engine
JPH0245474Y2 (en)
JPS61175229A (en) Intake device of engine
JP2507971Y2 (en) Engine intake system
JPS633376Y2 (en)
JPH07208185A (en) Swirl control valve of engine
JPH0324837Y2 (en)
JPH0335491B2 (en)