JP2020106017A - Intake manifold - Google Patents

Intake manifold Download PDF

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JP2020106017A
JP2020106017A JP2018248332A JP2018248332A JP2020106017A JP 2020106017 A JP2020106017 A JP 2020106017A JP 2018248332 A JP2018248332 A JP 2018248332A JP 2018248332 A JP2018248332 A JP 2018248332A JP 2020106017 A JP2020106017 A JP 2020106017A
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intake
intake manifold
internal space
main body
suction
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JP7049986B2 (en
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宮田　雄介
Yusuke Miyata
雄介 宮田
秀隆 森永
Hidetaka Morinaga
秀隆 森永
達也 森本
Tatsuya Morimoto
達也 森本
諭 長谷川
Satoshi Hasegawa
諭 長谷川
拓海 福田
Takumi Fukuda
拓海 福田
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Kubota Corp
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Abstract

To provide an intake manifold of which the combustion efficiency is further improved by being enhanced so as to feed uniform air to multiple intake ports as further as possible while including an intake manifold main body part in a distorted shape.SOLUTION: The present invention relates to an intake manifold comprising an intake manifold main body part 11A in which an internal space 13 including one long opening 13A covering multiple intake ports p1-p4 is formed, and an air intake part 11B which is formed in an intermediate part of the intake manifold main body part 11A in a length direction. A cross-sectional area in the internal space 13 in a direction orthogonal to the length direction is reduced in one end of the intake manifold main body part 11A in the length direction, and a guide G for guiding air moving forward from an intake passage 14A to the internal space 13 to the side of one end in the internal space 13 is provided in the intake passage 14A of the intake part 11B. The cross-sectional area of the internal space 13 in the one end is reduced by narrowing the depth of the internal space 13 with respect to the long opening 13A.SELECTED DRAWING: Figure 6

Description

本発明は、産業用エンジンなどの各種エンジンにおいて、シリンダヘッドの吸気側に装備される吸気マニホルドに関するものである。 The present invention relates to an intake manifold mounted on the intake side of a cylinder head in various engines such as industrial engines.

例えば、エンジンに適用される吸気マニホルドには、特許文献１にて開示される枝分れ形の吸気マニホルドや、特許文献２にて開示される箱型の吸気マニホルドのあることが知られている。 For example, it is known that an intake manifold applied to an engine includes a branched intake manifold disclosed in Patent Document 1 and a box-shaped intake manifold disclosed in Patent Document 2. ..

枝分れ形の吸気マニホルドは、各吸気ポートに対応する複数の枝分かれ管と、それら枝分かれ管の根元どうしを繋ぐ横に長いインマニ本体部と、空気の吸入部とを備える構造のものである。箱形の吸気マニホルドは、複数の吸気ポートを覆う大きさの１つの開口を備えるインマニ本体部と、空気の吸入部とを備える構造のものである。 The branched intake manifold has a structure including a plurality of branch pipes corresponding to the intake ports, a horizontally long intake manifold main body connecting the roots of the branch pipes, and an air intake portion. The box-shaped intake manifold has a structure including an intake manifold main body having one opening having a size that covers a plurality of intake ports, and an air intake.

箱型の吸気マニホルドを産業用ディーゼルエンジンに適用する場合、特許文献２において開示されるように、シリンダブロックの横側方で上部の位置に装備される燃料噴射用供給ポンプ（又はそのポンプハウジング）が、吸気マニホルドの配置スペースを妨げることがある。 When the box-type intake manifold is applied to an industrial diesel engine, a fuel injection supply pump (or a pump housing thereof) installed at an upper position laterally of a cylinder block, as disclosed in Patent Document 2. May interfere with the intake manifold placement space.

即ち、特許文献２の図１や図２（Ｂ）で示されるように、インマニ本体部における１気筒目の吸気ポートに対応する箇所と２気筒目の吸気ポートに対応する箇所の大部分とに相当する箇所の奥行きが、側方に配置される燃料噴射用供給ポンプとの干渉を避けるために、３，４気筒目の吸気ポートに対応する箇所の奥行きよりも格段に狭くせざるを得ない。つまり、インマニ本体の内部空間の断面積が、その長手方向の一端側が他端側よりも小さくなる不均一（非対称）で歪な形の吸気マニホルドになっている。 That is, as shown in FIG. 1 and FIG. 2(B) of Patent Document 2, in the portion corresponding to the intake port of the first cylinder and most of the portion corresponding to the intake port of the second cylinder in the intake manifold main body portion. In order to avoid the interference with the fuel injection supply pump arranged on the side, the depth of the corresponding portion has to be much smaller than the depth of the portion corresponding to the intake ports of the third and fourth cylinders. .. That is, the intake manifold has a non-uniform (asymmetric) and distorted shape in which the cross-sectional area of the internal space of the intake manifold main body is smaller at one end side in the longitudinal direction than at the other end side.

上記の歪な形の吸気マニホルドでは、各吸気ポートでの吸入空気量に差が出易い不利がある。そこで、吸気マニホルドを、良質で精密な仕上げが可能で大量生産にも適したダイカスト製として、インマニ本体部における断面積が減少する形状変化部を滑らかな面に形成し、空気の流れを改善することも試されているが、十分ではない。 The above-described distorted intake manifold has a disadvantage that the intake air amount at each intake port tends to differ. Therefore, the intake manifold is made of die-casting that is capable of high-quality and precise finishing and is suitable for mass production, and the shape change part where the cross-sectional area of the intake manifold main body is reduced is formed on the smooth surface to improve the air flow. Things have been tried, but not enough.

実開昭５９−１３９５７０号公報Japanese Utility Model Laid-Open No. 59-139570 特開２０１５−３４５２６号公報JP, 2015-34526, A

本発明の目的は、インマニ本体部や吸入部などの各部の形状や構造の更なる工夫により、歪な形のインマニ本体部を有しながらも、複数の吸気ポートに極力均一な空気が送れるように改善して、より燃焼効率に優れる吸気マニホルドを提供する点にある。 An object of the present invention is to improve the shape and structure of each portion such as the intake manifold main body portion and the suction portion so that even air can be sent to a plurality of intake ports as much as possible even though the intake manifold main body portion has a distorted shape. In order to provide an intake manifold with improved combustion efficiency.

本発明は、吸気マニホルドにおいて、
複数の吸気ポートを覆う１つの長尺状開口を有する内部空間が形成されるインマニ本体部と、前記インマニ本体部の長手方向の中間部に形成される空気の吸入部とを有し、
前記内部空間における前記長手方向に直交する方向の断面積が、前記インマニ本体部の長手方向の一端部において縮小されており、
前記吸入部の吸入通路に、前記吸入通路から前記内部空間に進む空気を前記内部空間における前記一端部の側に案内するガイドが設けられていることを特徴とする。 The present invention, in the intake manifold,
An intake manifold main body in which an internal space having one elongated opening that covers a plurality of intake ports is formed; and an air intake portion formed in an intermediate portion in the longitudinal direction of the intake manifold main body,
The cross-sectional area in the direction orthogonal to the longitudinal direction in the internal space is reduced at one longitudinal end of the intake manifold main body,
The suction passage of the suction portion is provided with a guide for guiding the air traveling from the suction passage to the internal space to the one end side of the internal space.

前記一端部における前記内部空間の断面積の縮小は、前記長尺状開口に対する内部空間の奥行きを狭めることによるものである。また、前記ガイドは、前記吸入通路における前記一端部の側と反対側の壁面を、前記内部空間に近付くに連れてより膨出させた傾斜壁面とすることにより形成されている。 The reduction of the cross-sectional area of the internal space at the one end is due to the narrowing of the depth of the internal space with respect to the elongated opening. Further, the guide is formed by forming a wall surface on the side opposite to the one end portion side of the suction passage as an inclined wall surface that bulges as it approaches the internal space.

前記ガイドは、前記吸入通路の空気の流れ方向でのほぼ全域に亘る状態で設けられているとよく、前記吸入部は、前記吸入通路が前記内部空間における前記一端部ではない箇所に連通されるように、前記インマニ本体部に対する長手方向の位置が設定されていると好都合である。 The guide may be provided so as to extend over substantially the entire area of the suction passage in the direction of air flow, and the suction portion communicates with a portion of the suction passage that is not the one end portion of the internal space. As described above, it is convenient that the longitudinal position with respect to the intake manifold main body is set.

前記吸入部は、前記内部空間の長手方向及び奥行き方向の双方に交差する幅方向に沿って延びる前記吸入通路を有しているとよく、前記吸入部が、２気筒目の吸気ポートと３気筒目の吸気ポートとの間に相当する位置で前記インマニ本体部に形成された直列４気筒エンジン用のものであるとよい。 The suction part may have the suction passage extending along a width direction that intersects both the longitudinal direction and the depth direction of the internal space, and the suction part may include the second cylinder intake port and the third cylinder. It may be for an in-line four-cylinder engine formed in the intake manifold main body at a position corresponding to the eye intake port.

本発明によれば、吸入通路に設けられたガイドにより、吸入通路を通過する空気は、断面積の小さい箇所に行く流れが促進されるようになり、内部空間における複数の吸気ポートに対応する箇所での吸入空気量の差を縮めて均一化を図ることが可能になる。 According to the present invention, the guide provided in the intake passage facilitates the flow of the air passing through the intake passage to the portion having a small cross-sectional area, and the portion corresponding to the plurality of intake ports in the internal space. It is possible to reduce the difference in the intake air amount and to make it uniform.

従って、インマニ本体部の断面積がその長手方向で不均一となる歪な形状を呈する吸気マニホルドであっても、断面積の小さな箇所に位置する吸気ポートへの吸入空気量を無理なく増やせるようになる。 Therefore, even if the intake manifold has a distorted shape in which the cross-sectional area of the main body of the intake manifold is non-uniform in the longitudinal direction, it is possible to reasonably increase the intake air amount to the intake port located at a location with a small cross-sectional area. Become.

その結果、インマニ本体部や吸入部などの各部の形状や構造の更なる工夫により、歪な形のインマニ本体部を有しながらも、複数の吸気ポートに極力均一な空気が送れるように改善して、より燃焼効率に優れる吸気マニホルドを提供することができる。 As a result, by further devising the shape and structure of each part such as the intake manifold main body and suction part, we improved the air intake to multiple intake ports as much as possible while having a distorted intake manifold main body. As a result, it is possible to provide an intake manifold having a higher combustion efficiency.

産業用ディーゼルエンジンの右側面図Right side view of industrial diesel engine 図１に示すエンジンの平面図Plan view of the engine shown in FIG. 図１に示すエンジンの正面図Front view of the engine shown in FIG. 吸気マニホルド及び吸込みダクトを示す右側面図Right side view showing the intake manifold and suction duct 吸気マニホルドの平面図Top view of intake manifold 一部切欠きの吸気マニホルド及び吸込みダクトを示す左側面図Left side view showing partially cutaway intake manifold and suction duct

以下に、本発明による吸気マニホルド（エンジンの吸気マニホルド）の実施の形態を、直列４気筒の産業用ディーゼルエンジンに適用された場合について、図面を参照しながら説明する。 An embodiment of an intake manifold (intake manifold of an engine) according to the present invention will be described below with reference to the drawings when applied to an in-line four-cylinder industrial diesel engine.

図１〜図３に示されるように、産業用ディーゼルエンジン（以下、単にエンジンと略称する）Ｅは、シリンダブロック１の上にシリンダヘッド２が組付けられ、シリンダヘッド２の上にシリンダヘッドカバー（以下、「ヘッドカバー」と略称する）３が組付けられ、シリンダブロック１の下部にオイルパン４が組付けられている。シリンダブロック１の上半部はシリンダ１Ａに、そして、下半部はクランクケース１Ｂにそれぞれ構成されている。 As shown in FIGS. 1 to 3, in an industrial diesel engine (hereinafter simply referred to as engine) E, a cylinder head 2 is assembled on a cylinder block 1, and a cylinder head cover (on the cylinder head 2). Hereinafter, abbreviated as "head cover" 3 is assembled, and an oil pan 4 is assembled under the cylinder block 1. The upper half of the cylinder block 1 is formed in the cylinder 1A, and the lower half is formed in the crankcase 1B.

シリンダブロック１の前側に伝動ケース５が組み付けられ、伝動ケース５の下部にはクランク軸（図示省略）で駆動される駆動プーリ６が設けられている。伝動ケース５の上部には、エンジン冷却ファン７（図１を参照）を駆動するためのファンプーリ（図示省略）の支持ハブ７Ａが、前後向きの軸心Ｐを有する状態で設けられている。図示は省略するが、駆動プーリ６、ファンプーリ、及びその他の補機（オルタネータなど）の従動プーリ（図示省略）に亘って張架されるベルト（図示省略）が設けられている。 A transmission case 5 is attached to the front side of the cylinder block 1, and a drive pulley 6 driven by a crank shaft (not shown) is provided at the lower portion of the transmission case 5. A support hub 7A of a fan pulley (not shown) for driving the engine cooling fan 7 (see FIG. 1) is provided on the upper portion of the transmission case 5 in a state having an axial center P in the front-rear direction. Although illustration is omitted, a belt (not shown) stretched around a drive pulley 6, a fan pulley, and a driven pulley (not shown) of other auxiliary machines (alternator etc.) is provided.

シリンダブロック１の後端部にはフライホイールハウジング８が組付けられ、シリンダブロック１の左側には排気マニホルド（図示省略）やウォータフランジ９などが設けられている。シリンダブロック１の右側には、オイルフィルタ１０、吸気マニホルド１１、燃料噴射用供給ポンプ１２などが設けられている。このエンジンＥは、４つのピストン（図示省略）が前後直列に並んだ直列４気筒エンジンに構成されている。吸気マニホルド１１には、図示しないエアクリーナなどの吸気系に連通するために、略Ｊ字管状の吸込みダクト１６がボルト連結されている。 A flywheel housing 8 is attached to the rear end of the cylinder block 1, and an exhaust manifold (not shown) and a water flange 9 are provided on the left side of the cylinder block 1. An oil filter 10, an intake manifold 11, a fuel injection supply pump 12, and the like are provided on the right side of the cylinder block 1. The engine E is configured as an in-line four-cylinder engine in which four pistons (not shown) are arranged in series in front and rear. A substantially J-shaped suction duct 16 is bolted to the intake manifold 11 so as to communicate with an intake system such as an air cleaner (not shown).

図１、図４〜図６に示されるように、シリンダヘッド２の右側に取付けられている吸気マニホルド１１は、前後方向に長い１つの長尺状開口１３Ａを有する内部空間１３が形成されているインマニ本体部１１Ａと、インマニ本体部１１Ａの長手方向（前後方向）の中間部に形成される空気の吸入部１１Ｂと、を有する箱型のものに構成されている。長尺状開口１３Ａは、シリンダヘッド２において前後直列に並ぶ４箇所（複数の一例）の吸気ポートｐ１，ｐ２，ｐ３，ｐ４を覆う大きさを有する前後に長く上下に短い細長い形状の開口に形成されている。 As shown in FIGS. 1 and 4 to 6, the intake manifold 11 mounted on the right side of the cylinder head 2 has an internal space 13 having one elongated opening 13A extending in the front-rear direction. The intake manifold main body 11A and an air intake portion 11B formed in an intermediate portion in the longitudinal direction (front-back direction) of the intake manifold main body 11A are configured in a box shape. The long opening 13A is formed in a long and narrow long opening in the front and back and has a size that covers four (one example of) intake ports p1, p2, p3, p4 arranged in series in the front-rear direction in the cylinder head 2. Has been done.

インマニ本体部１１Ａは、複数のボルト挿通用孔（符記省略）を有する外周フランジ１１ａを備えており、長尺状開口１３Ａを有する内部空間１３は、その奥行きｄがインマニ本体部１１Ａの長手方向（前後方向）の後端部（一端部の一例）において狭められるという、歪な形に設定されている。即ち、図５に示されるように、内部空間１３は、その奥行きｄが、ある程度長い（深い）通常奥行きｄ１を持つ通常空間部１３Ｔを基本としているが、前端部における奥行きｄは通常奥行きｄ１より格段に狭い狭小奥行きｄ２（ｄ２＜ｄ１）を持つ狭小空間部１３Ｃに設定されている。つまり、内部空間１３は、前後方向に直交する方向である前後方向又は左右方向の断面積が、通常空間部１３Ｔよりも狭小空間部１３Ｃにおいて縮小されている。 The intake manifold main body 11A includes an outer peripheral flange 11a having a plurality of bolt insertion holes (not shown), and the internal space 13 having the elongated opening 13A has a depth d in the longitudinal direction of the intake manifold main body 11A. It is set in a distorted shape that is narrowed at the rear end (an example of one end) in the front-rear direction. That is, as shown in FIG. 5, the internal space 13 is based on the normal space portion 13T having a normal depth d1 having a relatively long (deep) normal depth d1, but the depth d at the front end is larger than the normal depth d1. It is set in the narrow space portion 13C having a markedly narrow narrow depth d2 (d2<d1). That is, the internal space 13 has a cross-sectional area in the front-rear direction or the left-right direction that is a direction orthogonal to the front-rear direction reduced in the narrow space portion 13C than in the normal space portion 13T.

狭小奥行きｄ２の部分（狭小空間部１３Ｃ）は、全長（長さ）Ｌを有する内部空間１３の後端から狭小部長さＬ２の範囲であり、傾斜側壁１１ｂを備える断面変化部１７及び狭小部長さＬ２を全長Ｌから減じた長さの部分が通常奥行きｄ１の箇所である。なお、断面変化部１７も通常奥行きｄ１の箇所と考えれば、内部空間１３における通常奥行きｄ１の部分（通常空間部１３Ｔ）は前端から（Ｌ−Ｌ２）の長さ部分である。つまり、インマニ本体部１１Ａは、左右幅が不均一な上壁１１ｃ及び下壁１１ｄと、通常側壁１１ｅと、傾斜側壁１１ｂと、狭小側壁１１ｆとを備え、奥行きｄが部位によって異なる段付形状の内部空間１３を有している。 The portion (narrow space portion 13C) having the narrow depth d2 is a range from the rear end of the internal space 13 having the total length (length) L to the narrow portion length L2, and the cross-section changing portion 17 including the inclined side wall 11b and the narrow portion length. A portion having a length obtained by subtracting L2 from the total length L is a place having a normal depth d1. If the cross-section changing portion 17 is also considered to be the normal depth d1, the portion of the internal space 13 having the normal depth d1 (normal space portion 13T) is the length portion from the front end to (L-L2). That is, the intake manifold main body portion 11A includes an upper wall 11c and a lower wall 11d whose lateral widths are not uniform, a normal side wall 11e, an inclined side wall 11b, and a narrow side wall 11f, and the depth d has a stepped shape that differs depending on the part. It has an internal space 13.

また、内部空間１３の幅（長尺状開口１３Ａの幅）ｗと通常奥行きｄ１及び狭小奥行きｄ２との寸法関係はｄ１＞ｗ＞ｄ２（ｄ１＝１．２ｗ、ｄ２＝０．４ｗ）に設定されているが、この限りではない。一例として、１．０ｗ≦ｄ１≦１．４ｗ、０．３ｗ≦ｄ２≦０．５ｗという寸法関係が施されている。また、内部空間１３の長手方向長さに関しては、狭小部長さＬ２と全長Ｌとに、０．２５Ｌ≦Ｌ２≦０．３５Ｌという関係が成り立つように設定されていることが多いが、それには限らない。 Further, the dimensional relationship between the width of the internal space 13 (width of the elongated opening 13A) w and the normal depth d1 and the narrow depth d2 is set to d1>w>d2 (d1=1.2w, d2=0.4w). However, this is not a limitation. As an example, dimensional relationships of 1.0w≦d1≦1.4w and 0.3w≦d2≦0.5w are provided. Further, with respect to the length of the internal space 13 in the longitudinal direction, the narrow portion length L2 and the total length L are often set so that the relationship of 0.25L≦L2≦0.35L is established, but it is not limited thereto. Absent.

図４〜図６に示されるように、吸入部１１Ｂは、吸入ケース部１４及び吸入フランジ１５を有し、吸入ケース部１４には吸入通路１４Ａが内部形成され、吸入フランジ１５には上向きに開口する空気入口１４ａ、及び２箇所のボルト孔（符記省略）が形成されている。吸入フランジ１５の上側に、前述の吸込みダクト１６のフランジ部１６Ａがボルト連結可能である。吸入部１１Ｂは、インマニ本体部１１Ａの長手方向の中間において幅ｗの方向（上下方向）に開口する状態で内部空間１３に連通する吸入通路１４Ａを有している。 As shown in FIGS. 4 to 6, the suction portion 11B has a suction case portion 14 and a suction flange 15, in which a suction passage 14A is formed internally, and the suction flange 15 is opened upward. There are formed an air inlet 14a and two bolt holes (not shown). The flange portion 16A of the suction duct 16 described above can be bolted to the upper side of the suction flange 15. The suction portion 11B has a suction passage 14A that communicates with the internal space 13 in the state of opening in the width w direction (vertical direction) in the middle of the longitudinal direction of the intake manifold main body portion 11A.

吸入部１１Ｂは、前後方向において吸入通路１４Ａが第３吸気ポートｐ３の少し第２吸気ポートｐ２寄りに位置する状態で、インマニ本体部１１Ａの通常奥行きｄ１を有する箇所である通常空間部１３Ｔから上方に突出形成されている。４つの吸気ポートｐ１〜ｐ４のうち、最も前側が１気筒目の吸気ポートｐ１であり、そこから後へ順に、２気筒目の吸気ポートｐ３、３気筒目の吸気ポートｐ３、４気筒目の吸気ポートｐ４と並んでいる。 The suction portion 11B is located above the normal space portion 13T, which is the portion having the normal depth d1 of the intake manifold main body portion 11A, in a state where the suction passage 14A is located slightly closer to the second suction port p2 than the third suction port p3 in the front-rear direction. Is formed to project. Of the four intake ports p1 to p4, the frontmost side is the intake port p1 of the first cylinder, and from there to the intake port p3 of the second cylinder, the intake port p3 of the third cylinder, the intake port of the fourth cylinder. It is lined up with port p4.

つまり、吸入部１１Ｂは、吸入通路１４Ａが内部空間１３における一端部（狭小空間部１３Ｃ）ではない箇所（通常空間部１３Ｔ）に連通されるように、インマニ本体部１１Ａに対する長手方向の位置〔例えば、内部空間１３の後端から前方へ距離Ｋの位置（図６参照）〕が設定されている。そして、吸入部１１Ｂは、内部空間１３の長手方向（前後方向）及び奥行き方向（左右方向）の双方に交差する幅方向（幅ｗの方向であって上下方向）に沿って延びる吸入通路１４Ａを有している、という構成である。 That is, the suction portion 11B is located at a longitudinal position with respect to the intake manifold main body portion 11A so that the suction passage 14A communicates with a portion (normal space portion 13T) that is not one end portion (narrow space portion 13C) in the internal space 13 [for example, , A position of a distance K from the rear end of the internal space 13 to the front (see FIG. 6)] is set. The suction portion 11B has a suction passage 14A extending along the width direction (the direction of the width w and the vertical direction) intersecting both the longitudinal direction (front-back direction) and the depth direction (horizontal direction) of the internal space 13. It has the configuration.

図４〜図６に示されるように、吸入部１１Ｂの吸入通路１４Ａに、吸入通路１４Ａから内部空間１３に進む空気を内部空間１３における一端部の側、即ち、前側（１気筒目の吸気ポートｐ１の側）に案内するガイドＧが設けられている。ガイドＧは、吸入通路１４Ａにおける一端部の側と反対側、即ち後側の壁面を、内部空間１３に近付く（下に行く）に連れてより一端部（前）の側に膨出させた傾斜壁面１８とすることにより形成されている。 As shown in FIGS. 4 to 6, in the suction passage 14A of the suction portion 11B, the air that advances from the suction passage 14A to the internal space 13 is located at one end side of the internal space 13, that is, the front side (the intake port of the first cylinder). A guide G that guides to the (p1 side) is provided. The guide G is an inclination in which the wall surface on the side opposite to the one end side in the suction passage 14A, that is, the rear side, bulges toward the one end (front) side as the inner space 13 approaches (goes down). It is formed by forming the wall surface 18.

傾斜壁面１８は、吸入通路１４Ａの空気の流れ方向でのほぼ全域、即ち上下長さの全域に亘る状態で設けられているが、この限りではない。また、傾斜壁面１８の垂線（吸入通路１４Ａの軸線）に対する傾き角度θは、例えば、５〜２５度（５度≦θ２５度）に設定されているが、この限りでもない。 The inclined wall surface 18 is provided in a state of substantially the entire area of the intake passage 14A in the air flow direction, that is, the entire area of the vertical length, but is not limited thereto. Further, the inclination angle θ with respect to the vertical line of the inclined wall surface 18 (the axis of the suction passage 14A) is set to, for example, 5 to 25 degrees (5 degrees ≤ θ25 degrees), but is not limited thereto.

傾斜壁面１８の傾き角度θを、内部空間１３全体に対する狭小空間部１３Ｃのだいたいの比率Ｌ２／Ｌにより変化させる構成であってもよい。例えば、Ｌ２／Ｌの大小に比例して傾き角度θも大小させることが考えられ、吸気マニホルド１１の形に応じて最適な吸入空気量のバランスが取れる利点をもつガイドＧが実現できる。
さらに、吸入部１１Ｂのインマニ本体部１１Ａの長手方向の位置（Ｋ／Ｌ）に応じて、傾き角度θを可変させる構成を採用してもよい。例えば、内部空間１３の他端（後端）から吸入部１１Ｂの中心（軸線）までの長さＫの内部空間１３の全長Ｌに対する比率、即ちＫ／Ｌの大小に反比例して傾き角度を大小させることが考えられる。 The inclination angle θ of the inclined wall surface 18 may be changed according to the ratio L2/L of the narrow space portion 13C to the entire internal space 13. For example, it is conceivable that the inclination angle θ is also increased/decreased in proportion to the magnitude of L2/L, and the guide G having an advantage that the optimum intake air amount can be balanced according to the shape of the intake manifold 11 can be realized.
Furthermore, a configuration may be adopted in which the tilt angle θ is variable according to the longitudinal position (K/L) of the intake manifold body 11A of the suction portion 11B. For example, the inclination angle is large or small in inverse proportion to the ratio of the length K from the other end (rear end) of the internal space 13 to the center (axis) of the suction portion 11B to the total length L of the internal space 13, that is, the size of K/L. It is possible to make it.

図４〜図６に示されるように、吸入通路１４Ａに設けられたガイドＧにより、吸入通路１４Ａを通過する空気は、図６に白抜き矢印で示されるように、１気筒目の吸気ポートｐ１に対応する箇所、即ち、狭小空間部１３Ｃに行く流れが促進されるようになる。インマニ本体部１１Ａにおける断面積の小さい箇所である狭小空間部１３Ｃへ、積極的に空気の流れを作ることにより、複数の吸気ポートｐ１〜ｐ４での吸入空気量の差を縮めて均一化を図ることが可能になる。 As shown in FIGS. 4 to 6, the air passing through the intake passage 14A is guided by the guide G provided in the intake passage 14A so that the intake port p1 of the first cylinder is changed as shown by the white arrow in FIG. The flow going to a portion corresponding to, that is, the narrow space portion 13C is promoted. By positively creating a flow of air to the narrow space portion 13C, which is a portion having a small cross-sectional area in the intake manifold main body portion 11A, the difference in the intake air amount at the plurality of intake ports p1 to p4 is reduced to achieve uniformity. It will be possible.

従って、通常空間部１３Ｔと狭小空間部１３Ｃとを持つなど、インマニ本体部１１Ａの断面積がその長手方向で不均一となる歪な形状を呈する吸気マニホルド１１であっても、断面積の小さな箇所（狭小空間部１３Ｃ）に位置する吸気ポートへの吸入空気量を無理なく増やせるようになる。その結果、複数の吸気ポートへの吸入空気量の均一化が極力図れるようになり、燃焼効率に優れる吸気マニホルドを提供することができる。また、それによってダイカスト製の吸気マニホルドとしても、気筒間の吸入空気量のバラつきを低減することができる。 Therefore, even in the intake manifold 11 having a normal space portion 13T and a narrow space portion 13C and having a distorted shape in which the cross-sectional area of the intake manifold main body portion 11A becomes non-uniform in the longitudinal direction, a portion with a small cross-sectional area is provided. The amount of intake air to the intake port located in (narrow space portion 13C) can be reasonably increased. As a result, the intake air amounts to the plurality of intake ports can be made uniform as much as possible, and an intake manifold having excellent combustion efficiency can be provided. Further, as a result, even in the intake manifold made of die cast, it is possible to reduce the variation in the intake air amount between the cylinders.

〔別実施形態〕
（１）本実施形態においては、吸入部１１Ｂは、２気筒目の吸気ポートｐ２と３気筒目の吸気ポートｐ３との間に相当する位置でインマニ本体部１１Ａに形成された直列４気筒エンジン用のものであるが、１気筒目の吸気ポートｐ１と２気筒目の吸気ポートｐ２との間や、３気筒目の吸気ポートｐ３と４気筒目の吸気ポートｐ４との間に吸入部１１Ｂが設けられた吸気マニホルド１１でもよい。 [Another embodiment]
(1) In the present embodiment, the intake portion 11B is for the in-line 4-cylinder engine formed in the intake manifold main body portion 11A at a position corresponding to between the intake port p2 of the second cylinder and the intake port p3 of the third cylinder. The intake portion 11B is provided between the intake port p1 of the first cylinder and the intake port p2 of the second cylinder, and between the intake port p3 of the third cylinder and the intake port p4 of the fourth cylinder. The intake manifold 11 provided may be used.

（２）ガイドＧは、案内板や上窄まり三角形を呈する部材など、吸入部１１Ｂと別個の部材１８を吸入通路１４Ａに取付けることでなる、という構成でもよい。既存の吸気マニホルドにガイドを後付け装備することが可能となる利点がある。 (2) The guide G may be configured such that a member 18 that is separate from the suction portion 11B, such as a guide plate or a member having an upper constricted triangular shape, is attached to the suction passage 14A. There is an advantage that a guide can be retrofitted to the existing intake manifold.

１１Ａ インマニ本体部
１１Ｂ 吸入部
１３ 内部空間
１３Ａ 長尺状開口
１８ 傾斜壁面
Ｇ ガイド
ｄ 奥行き
ｐ１〜ｐ４ 吸気ポート 11A intake manifold main body 11B intake part 13 internal space 13A elongated opening 18 inclined wall surface G guide d depth p1 to p4 intake port

Claims (7)

複数の吸気ポートを覆う１つの長尺状開口を有する内部空間が形成されるインマニ本体部と、前記インマニ本体部の長手方向の中間部に形成される空気の吸入部とを有し、
前記内部空間における前記長手方向に直交する方向の断面積が、前記インマニ本体部の長手方向の一端部において縮小されており、
前記吸入部の吸入通路に、前記吸入通路から前記内部空間に進む空気を前記内部空間における前記一端部の側に案内するガイドが設けられている吸気マニホルド。 An intake manifold main body in which an internal space having one elongated opening that covers a plurality of intake ports is formed; and an air intake portion formed in an intermediate portion in the longitudinal direction of the intake manifold main body,
The cross-sectional area in the direction orthogonal to the longitudinal direction in the internal space is reduced at one longitudinal end of the intake manifold main body,
An intake manifold, wherein a guide is provided in an intake passage of the intake portion to guide air traveling from the intake passage to the internal space toward the one end side of the internal space. 前記一端部における前記内部空間の断面積の縮小は、前記長尺状開口に対する内部空間の奥行きを狭めることによるものである請求項１に記載の吸気マニホルド。 The intake manifold according to claim 1, wherein the reduction of the cross-sectional area of the internal space at the one end is achieved by reducing the depth of the internal space with respect to the elongated opening. 前記ガイドは、前記吸入通路における前記一端部の側と反対側の壁面を、前記内部空間に近付くに連れてより膨出させた傾斜壁面とすることにより形成されている請求項１又は２に記載の吸気マニホルド。 The said guide is formed by making the wall surface on the opposite side to the said one end part side in the said suction passage into the inclined wall surface which expanded more as it approached to the said internal space. Intake manifold. 前記ガイドは、前記吸入通路の空気の流れ方向でのほぼ全域に亘る状態で設けられている請求項１〜３のいずれか一項に記載の吸気マニホルド。 The intake manifold according to any one of claims 1 to 3, wherein the guide is provided so as to extend over substantially the entire area of the intake passage in the direction of air flow. 前記吸入部は、前記吸入通路が前記内部空間における前記一端部ではない箇所に連通されるように、前記インマニ本体部に対する長手方向の位置が設定されている請求項１〜４のいずれか一項に記載の吸気マニホルド。 5. The position of the suction portion in the longitudinal direction with respect to the intake manifold main body portion is set so that the suction passage communicates with a portion of the internal space that is not the one end portion. Intake manifold described in. 前記吸入部は、前記内部空間の長手方向及び奥行き方向の双方に交差する幅方向に沿って延びる前記吸入通路を有している請求項１〜５のいずれか一項に記載の吸気マニホルド。 The intake manifold according to any one of claims 1 to 5, wherein the suction portion has the suction passage extending along a width direction that intersects both the longitudinal direction and the depth direction of the internal space. 前記吸入部が、２気筒目の吸気ポートと３気筒目の吸気ポートとの間に相当する位置で前記インマニ本体部に形成された直列４気筒エンジン用のものである請求項１〜６のいずれか一項に記載の吸気マニホルド。 7. The in-line four-cylinder engine formed in the intake manifold main body at a position corresponding to the intake port of the second cylinder and the intake port of the third cylinder, wherein the intake portion is for an in-line four-cylinder engine. The intake manifold according to claim 1.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5984260U (en) * 1982-11-27 1984-06-07 日野自動車株式会社 Box-shaped intake manifold of direct injection multi-cylinder diesel engine
JPS59139570U (en) * 1983-03-08 1984-09-18 ヤンマーディーゼル株式会社 intake manifold
JPH0254358U (en) * 1988-10-12 1990-04-19
JP2001329923A (en) * 2000-05-19 2001-11-30 Kubota Corp Multi-cylinder gasoline engine
JP2007071052A (en) * 2005-09-05 2007-03-22 Hino Motors Ltd Gas engine
JP2015034526A (en) * 2013-08-09 2015-02-19 株式会社クボタ Intake manifold of multi-cylinder engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5984260U (en) * 1982-11-27 1984-06-07 日野自動車株式会社 Box-shaped intake manifold of direct injection multi-cylinder diesel engine
JPS59139570U (en) * 1983-03-08 1984-09-18 ヤンマーディーゼル株式会社 intake manifold
JPH0254358U (en) * 1988-10-12 1990-04-19
JP2001329923A (en) * 2000-05-19 2001-11-30 Kubota Corp Multi-cylinder gasoline engine
JP2007071052A (en) * 2005-09-05 2007-03-22 Hino Motors Ltd Gas engine
JP2015034526A (en) * 2013-08-09 2015-02-19 株式会社クボタ Intake manifold of multi-cylinder engine

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