JP5571370B2 - Intake device for internal combustion engine - Google Patents

Intake device for internal combustion engine Download PDF

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Publication number
JP5571370B2
JP5571370B2 JP2009288999A JP2009288999A JP5571370B2 JP 5571370 B2 JP5571370 B2 JP 5571370B2 JP 2009288999 A JP2009288999 A JP 2009288999A JP 2009288999 A JP2009288999 A JP 2009288999A JP 5571370 B2 JP5571370 B2 JP 5571370B2
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Prior art keywords
intake
surge tank
internal combustion
combustion engine
intake device
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JP2011127564A (en
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隆 窪田
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Daihatsu Motor Co Ltd
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Daihatsu Motor Co Ltd
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Description

本発明は,複数の気筒を備えた内燃機関において,エアクリーナから送られた吸気を各気筒に分配するための吸気装置に関するものである。 The present invention relates to an intake device for distributing intake air sent from an air cleaner to each cylinder in an internal combustion engine having a plurality of cylinders.

最近の内燃機関においては,先行技術としての特許文献1及び2等に記載されているように,吸気効率を向上を図るために,エアクリーナからの吸気入口を有するサージタンクと内燃機関の各気筒との間を,各気筒ごとに独立する吸気枝管にて接続するという構成にした吸気装置が使用されている。   In recent internal combustion engines, as described in Patent Documents 1 and 2 as prior art, in order to improve intake efficiency, a surge tank having an intake port from an air cleaner, each cylinder of the internal combustion engine, An intake device is used in which the cylinders are connected by an independent intake branch pipe for each cylinder.

特開昭57−193755号公報JP-A-57-193755 特開2006−118437号公報JP 2006-118437 A

前記各特許文献の記載の吸気装置は,そのいずれも,各気筒への吸気枝管を,サージタンクの底面から下向きに延びるように構成していることにより,前記サージタンク内における凝縮水等の水が液体のままの状態で吸気枝管を通って気筒の燃焼室に吸い込まれることになるから,燃焼の悪化を招来するおそれが大きいという問題がある。 In each of the intake devices described in each of the patent documents, the intake branch pipe to each cylinder is configured to extend downward from the bottom surface of the surge tank. because so that water is drawn into the combustion chamber of the cylinder through the intake manifold in a state of the liquid body, there is a problem that a possibility is high that lead to deterioration of combustion.

また,特許文献2の吸気装置においては,サージタンク内における凝縮水等の水,当該サージタンクの底に一旦溜めるようにしているが,このサージタンクの底に溜まった水は,内燃機関の始動の際,及び/又は,内燃機関の加速の際に,これも液体のままの状態で吸気枝管を通って気筒の燃焼室に一気に吸い込まれることになるから,内燃機関始動性の低下や加速性の低下といった悪影響を及ぼすという問題がある。 In the intake device of Patent Document 2, the water such as condensed water in the surge tank, but so that accumulated temporarily in the bottom of the Sajitan click, the water collected in the bottom of the Sajitan click, the internal combustion engine during start-up, and / or when the acceleration of the internal combustion engine, which is also because become once sucked is that the combustion chamber of the cylinder in a state of liquid through the intake branch pipe, low startability of the internal combustion engine there is a problem that adverse effects, such as under and decrease of acceleration resistance.

本発明は,前記の吸気装置において,前記した問題を解消することを技術的課題としている。   This invention makes it a technical subject to eliminate the above-mentioned problem in the said intake device.

この技術的課題を達成するため請求項1は,
「エアクリーナからの吸気入口を有するサージタンクと内燃機関の各気筒との間を,各気筒ごとに独立した吸気枝管にて接続して成る吸気装置において,
前記各吸気枝管のうち少なくとも一つの吸気枝管は,前記サージタンクの底部から横向きに延びる接続部とこの接続部から上向きに曲がる立ち上がり部とを有しており,前記接続部の内底面を前記サージタンクの内底面から段落ちさせており,更に,前記段落ち部の上方に下向きの傾斜部を設けている。」
ことを特徴としている。
In order to achieve this technical problem, claim 1
“In an intake system that connects a surge tank having an intake inlet from an air cleaner and each cylinder of an internal combustion engine with an independent intake branch pipe for each cylinder.
At least one of the intake branch pipes has a connection portion extending laterally from the bottom portion of the surge tank and a rising portion bent upward from the connection portion, and an inner bottom surface of the connection portion is formed. A step is dropped from the inner bottom surface of the surge tank, and a downward inclined portion is provided above the stepped portion . "
It is characterized by that.

また,請求項2は,
「前記請求項1の記載において,前記一つの吸気枝管の接続部は前記サージタンク吸気入口対向している。」
ことを特徴としている。
Claim 2
"In the device according to claim 1, the connection portion of the one intake branch pipes are air inlet facing the front Symbol surge tank."
It is characterized by that.

請求項1によると,サージタンクの底に溜まった凝縮水等の水は,前記サージタンクから各気筒への吸気枝管のうち一つの吸気枝管における横向きの接続部の底に入って溜まり,この水は,サージタンク内から気筒に向かうように流れる吸気によって吹き上げられることによって水滴になる。 According to claim 1, water such as condensed water Tsu ball in the bottom of the surge tank, reservoir enters from the surge tank to the bottom of the transverse connecting part in one of the intake branch pipe of the intake branch pipe to each cylinder This water becomes water droplets by being blown up by the intake air flowing from the surge tank toward the cylinder.

この水滴は,前記横向きの接続部の下流側に設けられている上向きへの立ち上がり部において浮遊する状態で,吸気に比較的長い時間にわたって曝されることにより,大部分が気化することになる。   Most of the water droplets are vaporized by being exposed to the intake air for a relatively long time in a state of floating at the upward rising portion provided on the downstream side of the lateral connection portion.

これにより,前記サージタンク内の底に溜まった水が,液体の状態のままで気筒の燃焼室に吸い込まれるのを大幅に少なくできるから,水の吸い込みよって燃焼性の悪化,始動性の低下及び加速性の低下を招来することを確実に低減できる。 Thus, the water said Tsu balls on the bottom of the surge tank is, because from being sucked into the combustion chamber of the cylinder in the state of liquid can be greatly reduced, deterioration of the combustibility I by suction of water, startability It is possible to reliably reduce the deterioration of the acceleration and the acceleration.

特に,請求項2によると,前記サージタンク内の底に溜まった水は吸気流によって一つの吸気枝管内に積極的に押し込まれることになるから,前記した効果をより助長できる。 In particular, according to claim 2, said Tsu balls on the bottom of the surge tank water from will be pushed actively Thus one intake branch pipe to the intake flow can be more conducive to the above-described effect.

内燃機関の平面図である。It is a top view of an internal combustion engine. 図1のII−II視右側面図である。FIG. 2 is a right side view taken along the line II-II in FIG. 1. 図1のIII −III 視正面図である。It is the III-III front view of FIG. 図2のIV−IV視断面図である。FIG. 4 is a sectional view taken along line IV-IV in FIG. 2.

以下,本発明の実施の形態を,図1〜図4の図面について説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

これらの図において,符号1は複数個(三つ)の気筒2,3,4を備えた内燃機関を示し,この内燃機関1の一方の側面には吸気装置5が取付けられている。 In these figures, reference numeral 1 denotes an internal combustion engine having a cylinder 2, 3 and 4 several double (three), the air intake device 5 is attached to one side of the internal combustion engine 1.

この吸気装置5は,硬質合成樹脂製であり,前記内燃機関1の各気筒2,3,4における吸気ポート2a,3a,4aよりも低い部位に配設したサージタンク6と,このサージタンク6と前記各気筒2,3,4における吸気ポート2a,3a,4aとの間を各気筒2,3,4ごとに独立して接続する吸気枝管7,8,9とによって構成されている。 The intake device 5 is made of a hard synthetic resin, and a surge tank 6 disposed in a portion lower than the intake ports 2a, 3a, 4a in the cylinders 2, 3, 4 of the internal combustion engine 1, and the surge tank 6 And intake branch pipes 7, 8, and 9 that connect the intake ports 2a, 3a, and 4a of the cylinders 2, 3, and 4 independently for each of the cylinders 2, 3, and 4, respectively.

前記サージタンク6には,図示しないエアクリーナからの吸気が入る吸気入口10が一体に設けられ,その上面には,前記各気筒2,3,4のうち二つ気筒2,3への吸気枝管7,8が一体に接続されている。   The surge tank 6 is integrally provided with an intake inlet 10 for receiving intake air from an air cleaner (not shown), and an intake branch pipe for two cylinders 2 and 3 among the cylinders 2, 3 and 4 is formed on the upper surface thereof. 7 and 8 are connected together.

また,前記サージタンク6のうち前記吸気入口10と反対側の部分における底部には,前記各気筒2,3,4のうち残り一つの気筒3への吸気枝管9が,横向きにして一体に接続されており,この横向きの接続部9aは,前記吸気入口10からの吸気が吹き込まれるように前記吸気入口10対向している。 In addition, an intake branch pipe 9 to the remaining one cylinder 3 of the cylinders 2, 3, 4 is integrated in a lateral direction at the bottom of the surge tank 6 on the opposite side of the intake inlet 10. are connected, the lateral connection portion 9a, intake from the intake inlet 10 is opposite to the intake inlet 10 as blown.

前記一つの吸気枝管9には,前記横向きの接続部9aから上向きに曲がる立ち上がり部9bが設けられている。 Wherein the one intake branch pipe 9, rise portion 9b is provided to bend upward direction from said lateral connecting portion 9a.

この構成において,前記サージタンク6の内底面6aに溜まった凝縮水等の水は,前記サージタンク6から各気筒2,3,4への吸気枝管7,8,9のうち一つの吸気枝管9における横向きの接続部9aの内底面9a′に入って溜まり,この水は,サージタンク6内から気筒に向かうように流れる吸気によって吹き上げられることによって水滴になる。 In this arrangement, water condensation water or the like Tsu ball on the inner bottom surface 6a of the surge tank 6, the intake from the surge tank 6 of one of the intake branch pipe 7, 8, 9 to the respective cylinders 2, 3, 4 The water enters and accumulates in the inner bottom surface 9a 'of the laterally connecting portion 9a in the branch pipe 9, and this water becomes water droplets by being blown up by the intake air flowing from the inside of the surge tank 6 toward the cylinder.

この水滴は,前記横向きの接続部9aの下流側に設けられている上向きへの立ち上がり部9bにおいて浮遊する状態で,吸気に比較的長い時間にわたって曝されることにより,大部分が気化することになる。   Most of the water droplets are vaporized by being exposed to the intake air for a relatively long time in a state of floating in the upward rising portion 9b provided on the downstream side of the lateral connection portion 9a. Become.

この場合,前記一つの吸気枝管9における横向きの接続部9aが前記サージタンク6 吸気入口10対向していることにより,前記サージタンク6内の底に溜まった水は,吸気入口10から入る吸気によって一つの吸気枝管9内に積極的に押し込まれることになる。 In this case, by the lateral connecting portion 9a of the one intake branch pipe 9 is facing the intake-air inlet 10 before Symbol surge tank 6, said Tsu balls on the bottom of the surge tank 6 Water intake inlet The intake air flow entering from 10 is positively pushed into one intake branch 9.

また,前記一つの吸気枝管9における横向きの接続部9aの内底面9a′を,前記サージタンク6における内底面6aよりも一段低くしており,これにより,前記サージタンク6から前記一つの吸気枝管9への水の流れを良好にしている。また,図4のとおり,前記段落ち部の上方に下向きの傾斜部を設けている。 Further, the inner bottom surface 9a 'of the lateral connecting portion 9a before Symbol one intake branch pipes 9, wherein the has one step lower than the inner bottom surface 6a of the surge tank 6, thereby, from the surge tank 6 of the one The flow of water to the intake branch pipe 9 is improved. Further, as shown in FIG. 4, a downward inclined portion is provided above the stepped portion.

また,前記硬質合成樹脂製の吸気装置5は,図2に示す側面視において,その吸気入口10の中心線10′及び各吸気枝管7,8,9の中心線7′,8′,9′を境界線として,内燃機関1に対して内側に位置した部分と外側に位置した部分とに二つ割りにされた状態に別々に成形し,その両者を合わせて,振動溶着等にて一体に接合することによって製造される。 The intake device 5 made of hard synthetic resin has a center line 10 'of the intake inlet 10 and center lines 7', 8 ', 9 of the intake branch pipes 7, 8, 9 in a side view shown in FIG. 'as a boundary line, molded separately the state is to split into a part that is located outside the portion located inwardly relative to the internal combustion engine 1, the combined both, joined together by vibration welding or the like Manufactured by doing.

換言すると,合成樹脂製の吸気装置を,部品点数が少なく製造は容易ではあるが形状の制約が多い二つ割り構造とした場合においても,本件発明の形状とすることで,凝縮水が吸気装置内に溜まるという不具合を防止できる。   In other words, even if the synthetic resin intake device has a two-part structure that has few parts and is easy to manufacture but has many shape constraints, the shape of the present invention allows condensate to flow into the intake device. The trouble of accumulating can be prevented.

1 内燃機関
2,3,4 気筒
5 吸気装置
6 サージタンク
6a′ サージタンクの内底面
7,8,9吸 気枝管
9a 横向きの接続部
9a′ 接続部の内底面
9b 上向きの立ち上がり部
10 吸気入口
DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2,3,4 cylinder 5 Intake device 6 Surge tank
6a 'Inner bottom surface of the surge tank 7, 8, 9 Intake branch pipe 9a Lateral connection
9a 'Internal bottom surface 9b of connecting part Upward rising part 10 Intake inlet

Claims (2)

エアクリーナからの吸気入口を有するサージタンクと内燃機関の各気筒との間を,各気筒ごとに独立した吸気枝管にて接続して成る吸気装置において,
前記各吸気枝管のうち少なくとも一つの吸気枝管は,前記サージタンクの底部から横向きに延びる接続部とこの接続部から上向きに曲がる立ち上がり部とを有しており,前記接続部の内底面を前記サージタンクの内底面から段落ちさせており,更に,前記段落ち部の上方に下向きの傾斜部を設けている,
内燃機関における吸気装置。
An intake device formed by connecting between the at independent intake branch pipe for each cylinder of the respective cylinders of the surge tank and the internal combustion engine having an intake inlet from the air cleaner,
At least one of the intake branch pipes has a connection portion extending laterally from the bottom portion of the surge tank and a rising portion bent upward from the connection portion, and an inner bottom surface of the connection portion is formed. A step is dropped from the inner bottom surface of the surge tank, and a downward inclined portion is provided above the stepped portion.
Intake device in an internal combustion engine.
前記請求項1の記載において,前記一つの吸気枝管の接続部は前記サージタンク吸気入口対向している
内燃機関における吸気装置。
In the description of the claim 1, the connection portion of the one intake branch pipes are air inlet facing the front Symbol surge tank,
Intake device in an internal combustion engine.
JP2009288999A 2009-12-21 2009-12-21 Intake device for internal combustion engine Expired - Fee Related JP5571370B2 (en)

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JP5571370B2 true JP5571370B2 (en) 2014-08-13

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WO2015145662A1 (en) * 2014-03-27 2015-10-01 日産自動車株式会社 Air intake device for internal combustion engine

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JP3108184B2 (en) * 1992-02-14 2000-11-13 富士重工業株式会社 Intake device for turbocharged engine
JPH09250408A (en) * 1996-03-14 1997-09-22 Toyota Motor Corp Intake pipe laying structure in intake device for internal combustion engine
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