JP4533722B2 - Intake device for slant type internal combustion engine - Google Patents

Intake device for slant type internal combustion engine Download PDF

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JP4533722B2
JP4533722B2 JP2004307231A JP2004307231A JP4533722B2 JP 4533722 B2 JP4533722 B2 JP 4533722B2 JP 2004307231 A JP2004307231 A JP 2004307231A JP 2004307231 A JP2004307231 A JP 2004307231A JP 4533722 B2 JP4533722 B2 JP 4533722B2
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intake
surge tank
intake pipe
combustion engine
cylinder
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JP2006118437A (en
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章 橋本
日出夫 山路
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Daihatsu Motor Co Ltd
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    • 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
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Description

本発明は，キャブオーバ型車両に搭載できるように，各気筒におけるシリンダの軸線をクランク軸の方向から見て水平線に対して傾斜（スラント）して成る内燃機関において，エアクリーナからの吸気を，慣性効果を利用して各気筒に導くための吸気装置に関するものである。   The present invention provides an inertial effect for intake air from an air cleaner in an internal combustion engine in which the cylinder axis of each cylinder is inclined (slant) with respect to a horizontal line when viewed from the direction of the crankshaft so as to be mounted on a cabover type vehicle. The present invention relates to an intake device for guiding to each cylinder by using the.

この種のスラント型内燃機関における吸気装置に関し，先行技術としての特許文献１及び特許文献２には，内燃機関を，その左右両長手側面のうち各気筒への吸気ポートが開口する一方の長手側面が上向きになるようにスラントし，この内燃機関における上面側のスペースに，エアクリーナより下流のスロットル弁からの吸気導入口を側面に備えたチャンバーを配設し，このチャンバーにおける他の側面に，各気筒ごとの吸気管を，当該他の側面から横向きに延びるように接続し，この各吸気管の先端を下向きに湾曲して，前記一方の長手側面に開口する吸気ポートに接続するという構成にすることが記載されている。   With respect to the intake device in this type of slant type internal combustion engine, Patent Documents 1 and 2 as prior art disclose that the internal combustion engine has one longitudinal side surface of the left and right longitudinal side surfaces where the intake port to each cylinder opens. In this internal combustion engine, a chamber having a side surface with an intake inlet from the throttle valve downstream from the air cleaner is disposed in the space on the upper surface side of the internal combustion engine. An intake pipe for each cylinder is connected so as to extend laterally from the other side surface, and the tip of each intake pipe is bent downward and connected to an intake port that opens on the one long side surface. It is described.

また，別の先行技術としての特許文献３には，内燃機関を，その左右両長手側面のうち各気筒への吸気ポートが開口する一方の長手側面が上向きになるようにスラントし，この内燃機関における上面側のスペースに，一つの側面にエアクリーナより下流のスロットル弁からの吸気導入口を備えたチャンバーを配設し，このチャンバーから各気筒ごとに延びる吸気管を，クランク軸の方向から見て横向きのＳ字状に湾曲して，この各吸気管の一端を，前記一方の長手側面に開口する吸気ポートに接続する一方，前記各吸気管の他端を，上向きにして，前記チャンバーの底面に接続するという構成にすることが記載されている。
特開平１１−２００９６８号公報 特開平１０−１１５２７１号公報 特開２００１−３８２５号公報 Further, in Patent Document 3 as another prior art, the internal combustion engine is slanted so that one of the left and right longitudinal sides of the internal combustion engine faces one longitudinal side where the intake port to each cylinder is open. A chamber with an intake inlet from a throttle valve downstream of the air cleaner is arranged on one side surface in the space on the upper surface side, and the intake pipe extending from this chamber for each cylinder is viewed from the direction of the crankshaft. Curved in a lateral S-shape, one end of each intake pipe is connected to an intake port that opens to the one longitudinal side surface, while the other end of each intake pipe faces upward so that the bottom surface of the chamber It is described that it is configured to connect to.
Japanese Patent Laid-Open No. 11-200968 JP-A-10-115271 JP 2001-3825 A

前者の特許文献１及び２に記載の吸気装置は，各気筒ごとの吸気管を，サージタンクの側面に横向きに接続するという構成であるから，前記サージタンクを，内燃機関に近づけるように高さの低い部位に配設することができ，しかも，スロットル弁からのサージタンへの吸気導入口は，前記各吸気管のうち一つの吸気管のサージタンクへの開口部により高い部位にあることにより，サージタンクの内底に溜まる水は，前記一つの吸気管から内燃機関側に吸気に同伴して逐次吸い出されるので，前記スロットル弁側に前記水が流入すること，ひいては，スロットル弁に氷結が発生することを回避できるという利点を有する。   The former intake devices described in Patent Documents 1 and 2 have a configuration in which an intake pipe for each cylinder is connected laterally to the side surface of the surge tank, and therefore the height of the surge tank is set close to the internal combustion engine. In addition, the intake inlet from the throttle valve to the surge tank is located higher than the opening to the surge tank of one of the intake pipes. The water accumulated in the inner bottom of the surge tank is sequentially sucked out from the one intake pipe to the internal combustion engine side along with the intake air, so that the water flows into the throttle valve side and eventually the throttle valve is frozen. It has the advantage that it can be avoided.

しかし，その反面，各気筒ごとの吸気管の長さが，当該吸気管を前記サージタンクの側面に対して水平横向きに接続する分だけ短くなるから，吸気の慣性効果がそれだけ低下することになるという問題がある。   However, on the other hand, the length of the intake pipe for each cylinder is shortened by connecting the intake pipe horizontally to the side of the surge tank, so that the inertia effect of intake is reduced accordingly. There is a problem.

一方，後者の特許文献３に記載の吸気装置は，各気筒ごとの吸気管を，クランク軸の方向から見て横向きのＳ字状に曲げるものであることにより，各吸気管の長さを前者の場合よりも長くすることができるから，吸気の慣性効果を確実に達成することができ，しかも，前記サージタンク内に水が溜まることがないという利点を有する。   On the other hand, in the latter intake device described in Patent Document 3, the length of each intake pipe is reduced by bending the intake pipe for each cylinder into a lateral S shape when viewed from the direction of the crankshaft. In this case, the inertia effect of intake air can be reliably achieved, and there is an advantage that water does not accumulate in the surge tank.

しかし，その反面，サージタンクを，当該サージタンクの底面に対して各吸気管の他端を上向きにして接続する分だけ，前者の場合（サージタンクの側面に接続する場合）よりも高い部位に配設しなければならないから，スラント型内燃機関において吸気装置を含む全体としての高さ寸法が可成り高くなるという問題がある。   However, on the other hand, the surge tank is connected to the bottom of the surge tank with the other end of each intake pipe facing upward so that it is higher than the former case (when connected to the side of the surge tank). Since it must be arranged, there is a problem that the overall height including the intake device is considerably increased in the slant type internal combustion engine.

本発明は，これらの問題を同時に解消することを技術的課題とするものである。   This invention makes it a technical subject to solve these problems simultaneously.

この技術的課題を達成するため本発明は，
「各気筒におけるシリンダ軸線をクランク軸の方向から見て，左右両長手側面のうち各気筒への吸気ポートが開口する一方の長手側面が上向きになるようにスラントする一方，上面側のスペースに，エアクリーナより下流のスロットル弁からの吸気導入口を備えたサージタンクと，このサージタンクから各気筒ごとに延びる吸気管とを配設して成るスラント型内燃機関において，
前記各吸気管を，クランク軸の方向から見て，一端が斜め下向きに傾斜し他端が斜め上向きに傾斜するように横向きＳ字状に湾曲して，その斜め下向きに傾斜した一端を，前記一方の長手側面に開口する吸気ポートに接続する一方，その斜め上向きに傾斜した他端を，前記サージタンクにおける縦向き側面板に，前記斜め上向きに傾斜したままで一体に接続して，この他端におけるサージタンクへの接続部を，当該接続部における内底面が前記吸気導入口の内底面より高い部位に位置するように構成し，更に，前記各吸気管のうち少なくとも一つの吸気管における前記サージタンクへの接続部に，当該一つの吸気管内と前記サージタンク内とを連通する通路溝を設けて，この通路溝の底面を，前記吸気導入口の内底面より低い部位で，且つ，前記一つの吸気管のうち斜め上向きに傾斜する部分に位置するように構成した。」
ことを特徴としている。 In order to achieve this technical problem, the present invention
“When the cylinder axis in each cylinder is viewed from the direction of the crankshaft, the slant is made so that one of the left and right longitudinal sides opens to the one of the longitudinal sides where the intake port to each cylinder opens, while the space on the top side In a slant type internal combustion engine comprising a surge tank having an intake inlet from a throttle valve downstream of an air cleaner and an intake pipe extending from the surge tank for each cylinder.
Each intake pipe is bent in a lateral S-shape so that one end is inclined obliquely downward and the other end is obliquely upward when viewed from the direction of the crankshaft, and one end inclined obliquely downward is One end connected to the intake port that opens on one longitudinal side, and the other end inclined obliquely upward is integrally connected to the longitudinal side plate of the surge tank while being inclined obliquely upward. The connection portion to the surge tank at the end is configured such that the inner bottom surface of the connection portion is located at a position higher than the inner bottom surface of the intake inlet, and further, the at least one intake pipe of the intake pipes the connection to the surge tank, provided with a passage groove which communicates with the one of the intake pipe and the surge tank, the bottom surface of the passage groove, at a lower portion than the inner bottom surface of the intake inlet, and, Configured to be positioned in a portion which is inclined obliquely upward out of the serial one intake pipe. "
It is characterized by that.

各気筒への吸気管を，クランク軸の方向から見て，一端が斜め下向きに他端が直線状で斜め上向きに傾斜するように横向きＳ字状に湾曲したことにより，前記各吸気管に，これをＳ字状に湾曲した分だけ，前記特許文献１及び２の場合よりも，十分な長さを確保できる。 The intake pipe to each cylinder is curved in a lateral S-shape so that one end is obliquely downward and the other end is linear and obliquely upward when viewed from the direction of the crankshaft. A sufficient length can be ensured by the amount of this curve in an S shape as compared with the case of Patent Documents 1 and 2.

そして，前記各吸気管において，その斜め上向きに傾斜した他端を，前記サージタンクにおける縦向き側面板に，斜め上向きに傾斜したままで一体に接続することに加えて，この他端におけるサージタンクへの接続部を，当該接続部の内底面が前記サージタンクへの吸気導入口の内底面より高い部位に位置するように構成したことにより，前記各吸気管に，十分な長さを確保できる状態のもとで，前記サージタンクを，各吸気管の他端をサージタンクにおける縦向き側面板に接続することに加えて，この各吸気管の他端におけるサージタンクへの接続部の内底面が前記吸気導入口の内底面より高い部位に位置する分だけ，前記特許文献３の場合よりも，内燃機関に近づけるように低い位置に設置することができる。 In each intake pipe, the other end inclined obliquely upward is integrally connected to the vertical side plate of the surge tank while being inclined obliquely upward. By connecting the connecting portion to the inner surface of the connecting portion at a position higher than the inner bottom surface of the intake inlet to the surge tank, a sufficient length can be secured for each intake pipe. In addition to connecting the other end of each intake pipe to the vertical side plate in the surge tank, the inner bottom surface of the connection to the surge tank at the other end of each intake pipe. Can be installed at a lower position so as to be closer to the internal combustion engine than in the case of Patent Document 3 by the amount that is higher than the inner bottom surface of the intake inlet.

ところで，各吸気管の他端におけるサージタンクへの接続部を，当該接続部の内底面がスロットル弁からサージタンクへの吸気導入口の内底面より高い部位に位置するという構成にした場合，前記したように，その分だけ，サージタンクを低い高さ位置に設置することができるものの，前記サージタンクの内底に溜まった水が，前記吸気管内側に流出することなく，前記吸気導入口からスロットル弁側に流出することになるから，スロットル弁に氷結が発生するおそれを招来する。   By the way, when the connection portion to the surge tank at the other end of each intake pipe is configured such that the inner bottom surface of the connection portion is positioned higher than the inner bottom surface of the intake inlet from the throttle valve to the surge tank, Thus, although the surge tank can be installed at a low height, the water accumulated in the inner bottom of the surge tank does not flow into the intake pipe and flows out of the intake inlet. Since it will flow out to the throttle valve side, the throttle valve may be frozen.

これに対して，本発明は，前記各吸気管のうち少なくとも一つの吸気管における前記サージタンクへの接続部に，当該一つの吸気管内と前記サージタンク内とを連通する通路溝を設けて，この通路溝の底面を，前記吸気導入口の内底面より低い部位で，且つ，前記一つの吸気管のうち斜め上向きに傾斜する部分に位置するように構成したものであり，この構成にすることにより，前記サージタンクの内底に溜まった水は，前記通路溝を介して一つの吸気管内に流出し，当該一つの吸気管内における吸気に同伴して気筒に吸引されることになり，また，前記サージタンクから各吸気管内に流出した水は，各吸気管を横向きＳ字状に湾曲したことでその下向き凸の湾曲部が内燃機関に近接して内燃機関の熱を受け易い状態になっていることにより，素早く蒸発して気筒に吸引されることになるから，前記水が，サージタンクへの吸気導入口からスロットル弁側に流出することを確実に回避できる。 On the other hand, in the present invention, a passage groove that communicates the inside of the one intake pipe and the inside of the surge tank is provided in a connection portion to the surge tank in at least one of the intake pipes. The bottom surface of the passage groove is configured to be located at a position lower than the inner bottom surface of the intake inlet and in a portion inclined obliquely upward in the one intake pipe. Thus, the water accumulated in the inner bottom of the surge tank flows out into one intake pipe through the passage groove, and is sucked into the cylinder accompanying the intake air in the one intake pipe. The water that flows out from the surge tank into each intake pipe is curved in an S shape in the horizontal direction so that the downward convex curved portion is close to the internal combustion engine and easily receives heat from the internal combustion engine. By being Since will be attracted to evaporate quickly to the cylinder, the water can be reliably prevented from flowing out to the throttle valve side from the intake air introduction port to the surge tank.

従って，本発明によると，慣性効果による吸気を達成と，スロットル弁における氷結防止とを確実に達成することができるものでありながら，スラント記型内燃機関において吸気装置を含む全体の高さ寸法を低くすることができる効果を有する。   Therefore, according to the present invention, it is possible to reliably achieve intake by the inertia effect and prevent icing in the throttle valve, but in the slant type internal combustion engine, the overall height including the intake device is reduced. The effect can be lowered.

以下，本発明の実施の形態を，図１及び図２の図面について説明する。   Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

この図において，符号１は，クランク軸２に沿って並ぶ三つの気筒を備えて成る多気筒内燃機関を示し，この多気筒内燃機関１は，下部に前記クランク軸２を内蔵したクランクケース３及びオイルパン４を備えたシリンダブロック５と，このシリンダブロック５の上面に締結したシリンダヘッド６とで構成され，前記クランク軸２の方向から見て（図１），前記各気筒におけるシリンダ軸線７が水平線８に対して適宜角度θだけ傾斜するスラント型に構成されている。   In this figure, reference numeral 1 denotes a multi-cylinder internal combustion engine having three cylinders arranged along a crankshaft 2. The multi-cylinder internal combustion engine 1 includes a crankcase 3 having a built-in crankshaft 2 at a lower portion thereof, and A cylinder block 5 having an oil pan 4 and a cylinder head 6 fastened to the upper surface of the cylinder block 5 are viewed from the direction of the crankshaft 2 (FIG. 1). The slant type is inclined with respect to the horizontal line 8 by an appropriate angle θ.

また，前記内燃機関１のシリンダヘッド６における左右両長手側面６ａ，６ｂのうち，前記スラントにて上向きになる一方の長手側面６ａには，前記各気筒における吸気ポート９が開口している。   Of the left and right long side surfaces 6a and 6b of the cylinder head 6 of the internal combustion engine 1, an intake port 9 in each cylinder is opened on one long side surface 6a which is upwardly directed by the slant.

符号１０は，前記内燃機関１の上面側のスペースに配設して成る全て合成樹脂製の吸気マニホールドを示し，この吸気マニホールド１０は，サージタンク１１と，このサージタンク１１から前記各気筒ごとに延びる三本の吸気管１２，１３，１４とから成り，前記サージタンク１１のうち一方の縦向き側面板には，吸気導入口１５が設けられ，この吸気導入口１５には，スロットル弁（図示せず）を内蔵したスロットルボデー１６が接合され，図示しないエアクリーナからの吸気が，スロットル弁を経て前記スロットルボデー１６及び前記吸気導入口１５を介して前記サージタンク１１内に導入するように構成されている。 Reference numeral 10 denotes an all-synthetic resin intake manifold arranged in a space on the upper surface side of the internal combustion engine 1. The intake manifold 10 is provided for each cylinder from the surge tank 11 and the surge tank 11. The intake tank 15 includes three intake pipes 12, 13, 14 extending, and one of the surge tanks 11 is provided with an intake inlet 15 on one of the vertical side plates . A throttle valve (see FIG. (Not shown) is connected to a throttle body 16, and intake air from an air cleaner (not shown) is introduced into the surge tank 11 through the throttle body 16 and the intake inlet 15 via a throttle valve. ing.

前記各吸気管１２，１３，１４を，前記クランク軸２の方向から見て（図１），その一端１２ａ，１３ａ，１４ａが斜め下向きに傾斜し，その他端１２ｂ，１３ｂ，１４ｂが直線状で斜め上向きに傾斜するように横向きＳ字状に湾曲して，その斜め下向きの一端１２ａ，１３ａ，１４ａを，前記シリンダヘッド６における一方の長手側面６ａに開口する吸気ポート９に差し込み接続する一方，その斜め上向きの他端１２ｂ，１３ｂ，１４ｂを，前記サージタンク１１における他方の縦向き側面板に，斜め上向きに傾斜したままで一体に接続する。 When the intake pipes 12, 13, and 14 are viewed from the direction of the crankshaft 2 (FIG. 1), their one ends 12a, 13a, and 14a are inclined obliquely downward, and the other ends 12b, 13b, and 14b are linear. One side 12a, 13a, 14a, which is curved in a lateral S-shape so as to be inclined obliquely upward, is inserted and connected to an intake port 9 opened in one longitudinal side surface 6a of the cylinder head 6, The other ends 12b, 13b, and 14b that are inclined upward are integrally connected to the other vertical side plate in the surge tank 11 while being inclined obliquely upward.

この場合において，前記吸気管１２，１３，１４の他端１２ｂ，１３ｂ，１４ｂにおけるサージタンク１１への接続部を，当該接続部における内底面１２ｂ′，１３ｂ′，１４ｂ′が前記スロットルボデー１４への前記吸気導入口１５における内底面１５ａよりも適宜寸法Ｈ１だけ高い部位に位置するように構成する。   In this case, the connection portions to the surge tank 11 at the other ends 12b, 13b, 14b of the intake pipes 12, 13, 14 are connected to the throttle body 14 at the inner bottom surfaces 12b ', 13b', 14b 'at the connection portions. The intake inlet 15 is positioned so as to be appropriately higher than the inner bottom surface 15a by a dimension H1.

また，前記各吸気管１２，１３，１４のうち一つの吸気管１２における他端１２ｂの前記サージタンク１１への接続部には，当該一つの吸気管１２内とサージタンク１１内とを連通する通路溝１７を設けて，この通路溝１７の底面を，前記吸気導入口１５の内底面１５ａより適宜寸法Ｈ２だけ低い部位で，且つ，前記一つの吸気管１２のうち斜め上向きに傾斜する部分に位置するように構成する。 In addition, the inside of one intake pipe 12 and the inside of the surge tank 11 are communicated with the connection portion of the other end 12b of one intake pipe 12 of the intake pipes 12, 13, and 14 to the surge tank 11. A passage groove 17 is provided, and the bottom surface of the passage groove 17 is a portion that is appropriately lower than the inner bottom surface 15a of the intake inlet 15 by a dimension H2 and that is inclined obliquely upward in the one intake pipe 12. Configure to be located.

このように，各気筒への吸気管１２，１３，１４を，クランク軸２の方向から見て，一端１２ａ，１３ａ，１４ａが斜め下向きに，他端１２ｂ，１３ｂ，１４ｂが斜め上向きに傾斜するように横向きＳ字状に湾曲したことにより，前記各吸気管１２，１３，１４に十分な長さを確保することができる。   Thus, when the intake pipes 12, 13, and 14 to each cylinder are viewed from the direction of the crankshaft 2, the one ends 12a, 13a, and 14a are inclined obliquely downward, and the other ends 12b, 13b, and 14b are inclined obliquely upward. As described above, the intake pipes 12, 13, 14 can be secured to a sufficient length by being curved in a lateral S shape.

そして，前記各吸気管１２，１３，１４において，その斜め上向きの他端１２ｂ，１３ｂ，１４ｂを，前記サージタンク１１における縦向き側面板に斜め上向きに傾斜したままで一体に接続することに加えて，この他端１２ｂ，１３ｂ，１４ｂにおけるサージタンク１１への接続部を，当該接続部の内底面１２ｂ′，１３ｂ′，１４ｂ′が前記サージタンク１１における縦向き側面板への吸気導入口１５の内底面１５ａより適宜寸法Ｈ１だけ高い部位に位置するように構成したことにより，前記各吸気管１２，１３，１４に十分な長さを確保できる状態のもとで，前記サージタンク１１を，各吸気管１２，１３，１４の他端１２ｂ，１３ｂ，１４ｂをサージタンク１１における縦向き側面板に接続することに加えて，この各吸気管の他端１２ｂ，１３ｂ，１４ｂにおけるサージタンク１１への接続部の内底面１２ｂ′，１３ｂ′，１４ｂ′が前記吸気導入口１５の内底面１５ａより適宜寸法Ｈ１だけ高い部位に位置する分だけ，前記特許文献３の場合よりも，内燃機関に近づけるように低い位置に設置することができる。 In addition, in each of the intake pipes 12, 13, and 14, the diagonally upward other ends 12 b, 13 b, and 14 b are integrally connected to the longitudinal side plate in the surge tank 11 while being inclined obliquely upward. The other end 12b, 13b, 14b is connected to the surge tank 11, and the inner bottom surface 12b ', 13b', 14b 'of the connection portion is the intake inlet 15 to the vertical side plate in the surge tank 11. The surge tank 11 can be placed under a state in which a sufficient length can be secured for each of the intake pipes 12, 13, and 14 by being positioned at a position that is appropriately higher than the inner bottom surface 15a by the dimension H1. In addition to connecting the other end 12b, 13b, 14b of each intake pipe 12, 13, 14 to the vertical side plate in the surge tank 11, the other end 12 of each intake pipe , 13b, 14b, the inner bottom surface 12b ', 13b', 14b 'of the connection portion to the surge tank 11 is positioned at a position appropriately higher than the inner bottom surface 15a of the intake air inlet 15 by the dimension H1. It can be installed at a lower position so as to be closer to the internal combustion engine than in the case of.

一方，前記各吸気管１２，１３，１４のうち一つの吸気管１２における他端１２ｂの前記サージタンク１１への接続部には，当該一つの吸気管１２内とサージタンク１１内とを連通する通路溝１７を設けて，この通路溝１７の底面を，前記吸気導入口１５の内底面１５ａより適宜寸法Ｈ２だけ低い部位で，且つ，前記一つの吸気管１２のうち斜め上向きに傾斜する部分に位置するように構成したことにより，前記サージタンク１１の内底に溜まった水は，前記通路溝１７を介して一つの吸気管１２内に流出し，当該一つの吸気管１２内における吸気に同伴して内燃機関にて消費されることになるから，前記水が，サージタンク１１への吸気導入口１５からスロットル弁側に流出することを確実に回避できる。 On the other hand, the inside of one intake pipe 12 and the inside of the surge tank 11 are communicated with the connection portion of the other end 12b of one intake pipe 12 of the intake pipes 12, 13, 14 to the surge tank 11. A passage groove 17 is provided, and the bottom surface of the passage groove 17 is a portion that is appropriately lower than the inner bottom surface 15a of the intake inlet 15 by a dimension H2 and that is inclined obliquely upward in the one intake pipe 12. As a result, the water accumulated in the inner bottom of the surge tank 11 flows into the one intake pipe 12 through the passage groove 17 and is accompanied by the intake air in the one intake pipe 12. Thus, the water is consumed by the internal combustion engine, so that it is possible to reliably prevent the water from flowing out from the intake inlet 15 to the surge tank 11 to the throttle valve side.

本発明の実施の形態を示す側面で図２のＩ−Ｉ視一部切欠側面図である。FIG. 3 is a partially cutaway side view taken along the line II of FIG. 2 in a side view illustrating an embodiment of the present invention. 図１のII−II視断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 1.

符号の説明Explanation of symbols

１ 内燃機関
２ クランク軸
７ シリンダ軸線
９ 吸気ポート
１０ 吸気マニホールド
１１ サージタンク
１２，１３，１４ 吸気管
１２ａ，１３ａ，１４ａ 吸気管の一端
１２ｂ，１３ｂ，１４ｂ 吸気管の他端
１２ｂ′，１３ｂ′，１４ｂ′ 吸気管の他端における内底面
１５ 吸気導入口
１５ａ 吸気導入口の内底面
１６ スロットルボデー
１７ 通路溝
１７′ 通路孔 DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Crankshaft 7 Cylinder axis 9 Intake port 10 Intake manifold 11 Surge tank 12, 13, 14 Intake pipe 12a, 13a, 14a One end of intake pipe 12b, 13b, 14b The other end of intake pipe 12b ', 13b', 14b 'inner bottom surface at the other end of the intake pipe 15 intake inlet 15a inner bottom surface of the intake inlet 16 throttle body 17 passage groove 17' passage hole

Claims (1)

各気筒におけるシリンダ軸線をクランク軸の方向から見て，左右両長手側面のうち各気筒への吸気ポートが開口する一方の長手側面が上向きになるようにスラントする一方，上面側のスペースに，エアクリーナより下流のスロットル弁からの吸気導入口を備えたサージタンクと，このサージタンクから各気筒ごとに延びる吸気管とを配設して成るスラント型内燃機関において，
前記各吸気管を，クランク軸の方向から見て，一端が斜め下向きに傾斜し他端が斜め上向きに傾斜するように横向きＳ字状に湾曲して，その斜め下向きに傾斜した一端を，前記一方の長手側面に開口する吸気ポートに接続する一方，その斜め上向きに傾斜した他端を，前記サージタンクにおける縦向き側面板に，前記斜め上向きに傾斜したままで一体に接続して，この他端におけるサージタンクへの接続部を，当該接続部における内底面が前記吸気導入口の内底面より高い部位に位置するように構成し，更に，前記各吸気管のうち少なくとも一つの吸気管における前記サージタンクへの接続部に，当該一つの吸気管内と前記サージタンク内とを連通する通路溝を設けて，この通路溝の底面を，前記吸気導入口の内底面より低い部位で，且つ，前記一つの吸気管のうち斜め上向きに傾斜する部分に位置するように構成したことを特徴とするスラント型内燃機関における吸気装置。 The cylinder axis line of each cylinder is slanted so that one of the left and right longitudinal sides of the left and right longitudinal sides where the intake port to each cylinder opens opens upward, while the air cleaner In a slant type internal combustion engine comprising a surge tank having an intake inlet from a throttle valve downstream and an intake pipe extending from the surge tank for each cylinder,
Each intake pipe is bent in a lateral S-shape so that one end is inclined obliquely downward and the other end is obliquely upward when viewed from the direction of the crankshaft, and one end inclined obliquely downward is One end connected to the intake port that opens on one longitudinal side, and the other end inclined obliquely upward is integrally connected to the longitudinal side plate of the surge tank while being inclined obliquely upward. The connection portion to the surge tank at the end is configured such that the inner bottom surface of the connection portion is located at a position higher than the inner bottom surface of the intake inlet, and further, the at least one intake pipe of the intake pipes the connection to the surge tank, provided with a passage groove which communicates with the one of the intake pipe and the surge tank, the bottom surface of the passage groove, at a lower portion than the inner bottom surface of the intake inlet, and, Intake device in the slant-type internal combustion engine, characterized by being configured to be positioned in a portion which is inclined obliquely upward out of the serial one intake pipe.
JP2004307231A 2004-10-21 2004-10-21 Intake device for slant type internal combustion engine Expired - Fee Related JP4533722B2 (en)

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Publication number Priority date Publication date Assignee Title
JP5885432B2 (en) * 2011-08-29 2016-03-15 ダイハツ工業株式会社 EGR structure
JP6695937B2 (en) * 2018-08-08 2020-05-20 本田技研工業株式会社 Engine intake manifold

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63200659U (en) * 1987-06-16 1988-12-23
JP2000179418A (en) * 1998-12-18 2000-06-27 Suzuki Motor Corp Intake device for engine
JP2001003825A (en) * 1999-06-16 2001-01-09 Suzuki Motor Corp Engine parts arranging structure
JP2003193919A (en) * 2001-12-21 2003-07-09 Suzuki Motor Corp Intake device for inclined engine
JP2003201926A (en) * 2002-01-07 2003-07-18 Denso Corp Air intake device for internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63200659U (en) * 1987-06-16 1988-12-23
JP2000179418A (en) * 1998-12-18 2000-06-27 Suzuki Motor Corp Intake device for engine
JP2001003825A (en) * 1999-06-16 2001-01-09 Suzuki Motor Corp Engine parts arranging structure
JP2003193919A (en) * 2001-12-21 2003-07-09 Suzuki Motor Corp Intake device for inclined engine
JP2003201926A (en) * 2002-01-07 2003-07-18 Denso Corp Air intake device for internal combustion engine

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