JP7159687B2 - engine cover - Google Patents

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JP7159687B2
JP7159687B2 JP2018150355A JP2018150355A JP7159687B2 JP 7159687 B2 JP7159687 B2 JP 7159687B2 JP 2018150355 A JP2018150355 A JP 2018150355A JP 2018150355 A JP2018150355 A JP 2018150355A JP 7159687 B2 JP7159687 B2 JP 7159687B2
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engine
engine cover
flow path
vehicle
sectional area
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JP2020026741A (en
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一広 森
吉高 進藤
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Toyota Motor Corp
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Toyota Motor Corp
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Description

本発明は、車両に設けられるエンジンカバーに関する。 The present invention relates to an engine cover provided on a vehicle.

従来、車両のエンジンには、冷却や騒音の低減を目的としてエンジンカバーが設けられるものがある（例えば、特許文献１参照）。 2. Description of the Related Art Conventionally, some vehicle engines are provided with an engine cover for the purpose of cooling and noise reduction (see Patent Document 1, for example).

特開２０１２－４０９１２号公報JP 2012-40912 A

しかしながら、例えば騒音を低減するためにエンジンカバーの面積を拡大した場合等、走行時にエンジンとエンジンカバーとの間を後方に向かって抜ける空気の圧力が大きくなり、エンジンカバーを浮き上がらせる力が大きくなって、エンジンカバーの脱落が発生し易くなるという問題があった。 However, for example, when the area of the engine cover is enlarged to reduce noise, the pressure of the air that flows rearward between the engine and the engine cover during running increases, and the force that lifts the engine cover increases. Therefore, there is a problem that the engine cover tends to come off.

本発明は、上記課題を解決するためになされたものであって、その目的は、脱落が発生し難くなるエンジンカバーを提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide an engine cover that is less likely to come off.

上記課題を解決するエンジンカバーは、車両のエンジンを車両の前後方向に沿って覆うエンジンカバーであって、前記エンジンとの対向面側に前後方向に沿った空気の流路を構成する凹部を備え、前記凹部は、その前後方向の中間部に前記流路の断面積を小さくする括れ部を有する。 An engine cover that solves the above problems is an engine cover that covers an engine of a vehicle along the front-rear direction of the vehicle, and includes a concave portion that forms an air flow path along the front-rear direction on the side facing the engine. , the concave portion has a constricted portion that reduces the cross-sectional area of the flow path in the middle portion in the front-rear direction.

同構成によれば、エンジンとの対向面側に前後方向に沿った空気の流路を構成する凹部を備え、凹部は、その前後方向の中間部に前記流路の断面積を小さくする括れ部を有するため、エンジンとエンジンカバーとの間を後方に向かって抜ける空気の圧力が括れ部の後方で小さくなり、エンジンカバーを浮き上がらせる力が小さくなる。よって、エンジンカバーの脱落が発生し難くなる。 According to this configuration, the concave portion forming an air flow path along the front-rear direction is provided on the side facing the engine, and the concave portion has a constricted portion that reduces the cross-sectional area of the flow path at the intermediate portion in the front-rear direction. , the pressure of the air flowing rearward between the engine and the engine cover becomes smaller behind the constricted portion, and the force for lifting the engine cover becomes smaller. Therefore, it becomes difficult for the engine cover to come off.

一実施形態における車両のエンジンとエンジンカバーの概略構成図。1 is a schematic configuration diagram of a vehicle engine and an engine cover in one embodiment; FIG. 一実施形態におけるエンジンカバーの底面図。The bottom view of the engine cover in one embodiment.

以下、車両の一実施形態について説明する。
図１に示すように、車両に設けられたエンジン１１の上方には、該エンジン１１を車両の前後方向に沿って覆うエンジンカバー１２が設けられている。本実施形態のエンジンカバー１２は、エンジン１１の上面にほぼ沿うように形成され、車両の前後方向の両端が徐々に下方に湾曲している。 An embodiment of a vehicle will be described below.
As shown in FIG. 1, an engine cover 12 is provided above an engine 11 provided in a vehicle to cover the engine 11 along the longitudinal direction of the vehicle. The engine cover 12 of the present embodiment is formed substantially along the upper surface of the engine 11, and both ends in the vehicle front-rear direction are gradually curved downward.

図２に示すように、エンジンカバー１２は、３箇所の締結部１３を有し、該締結部１３でエンジン１１の上面に固定されている。なお、締結部１３は、エンジンカバー１２を貫通してエンジン１１に対して螺合されるボルト等よりなる。 As shown in FIG. 2 , the engine cover 12 has three fastening portions 13 and is fixed to the upper surface of the engine 11 with the fastening portions 13 . The fastening portion 13 is made of a bolt or the like that passes through the engine cover 12 and is screwed to the engine 11 .

エンジンカバー１２は、エンジン１１との対向面側（図２中、紙面手前側）に車両の前後方向に沿った空気の流路１４を構成する凹部１５を備えている。凹部１５は、他の部位に対して上方（図２中、紙面奥方向）に立設される一対の側壁と、それら側壁の上端同士を繋ぐ底壁とにより構成されている。凹部１５は、前記２つの締結部１３の間を通って前後方向に延びている。 The engine cover 12 has a recessed portion 15 forming an air flow path 14 along the longitudinal direction of the vehicle on the side facing the engine 11 (the front side of the paper surface in FIG. 2). The concave portion 15 is composed of a pair of side walls that are erected upward (in the depth direction in FIG. 2) with respect to other portions, and a bottom wall that connects the upper ends of the side walls. The concave portion 15 extends in the front-rear direction through between the two fastening portions 13 .

そして、凹部１５は、車両の前後方向の中間部に前記流路１４の断面積を小さくする括れ部１６を有している。括れ部１６は、凹部１５の車両前方側の幅Ａ１及び凹部１５の車両後方側の幅Ａ２よりも小さい幅Ａ３を有することで車両前方側及び車両後方側に対して流路１４の断面積が小さくされている。なお、凹部１５の幅は、括れ部１６の前後で括れ部１６に向かって徐々に小さくされており、流路１４の断面積は括れ部１６の前後で括れ部１６に向かって徐々に小さくされている。 The recessed portion 15 has a constricted portion 16 that reduces the cross-sectional area of the flow path 14 at an intermediate portion in the longitudinal direction of the vehicle. The constricted portion 16 has a width A3 that is smaller than the width A1 of the recess 15 on the vehicle front side and the width A2 of the recess 15 on the vehicle rear side, so that the cross-sectional area of the flow path 14 is increased with respect to the vehicle front side and the vehicle rear side. made smaller. The width of the concave portion 15 is gradually decreased toward the constricted portion 16 before and after the constricted portion 16, and the cross-sectional area of the flow path 14 is gradually decreased toward the constricted portion 16 before and after the constricted portion 16. ing.

次に、上記のように構成されたエンジンカバー１２の作用について説明する。
例えば、車両の走行時には、エンジン１１とエンジンカバー１２との間を空気が後方に向かって流れ、その空気の多くは前記凹部１５にて構成される流路１４を流れることになる。このとき、括れ部１６の部位で空気の流速は小さくされ、括れ部１６の後方では空気の圧力が小さくなって、エンジンカバー１２をエンジン１１から離間させる（浮き上がらせる）力は小さくなる。そして、上記した空気の流れによりエンジン１１は冷却される。また、エンジン１１の駆動時には、該エンジン１１にて騒音が発生されるが、エンジンカバー１２によって騒音の漏れが抑えられる。なお、図２では、空気の流れる様子を矢印Ｘで模式的に図示している。 Next, operation of the engine cover 12 configured as described above will be described.
For example, when the vehicle is running, air flows rearward between the engine 11 and the engine cover 12 , and most of the air flows through the flow path 14 formed by the recess 15 . At this time, the flow velocity of the air is reduced at the portion of the constricted portion 16, the pressure of the air is reduced behind the constricted portion 16, and the force for separating (lifting) the engine cover 12 from the engine 11 is reduced. Then, the engine 11 is cooled by the air flow described above. Also, when the engine 11 is driven, the engine 11 generates noise, but the engine cover 12 suppresses leakage of the noise. In addition, in FIG. 2, the arrow X schematically shows how the air flows.

次に、上記実施形態の効果を以下に記載する。
（１）エンジン１１との対向面側に前後方向に沿った空気の流路１４を構成する凹部１５を備え、該凹部１５は、その前後方向の中間部に流路１４の断面積を小さくする括れ部１６を有する。よって、エンジン１１とエンジンカバー１２との間を後方に向かって抜ける空気の圧力が括れ部１６の後方で小さくなり、エンジンカバー１２を浮き上がらせる力が小さくなる。よって、例えば、締結部１３を増加させることなく、エンジンカバー１２の脱落を抑えることができる。 Next, the effects of the above embodiment will be described below.
(1) A concave portion 15 forming an air flow path 14 along the longitudinal direction is provided on the side facing the engine 11, and the concave portion 15 reduces the cross-sectional area of the flow path 14 at an intermediate portion in the longitudinal direction. It has a constricted portion 16 . Therefore, the pressure of the air flowing rearward between the engine 11 and the engine cover 12 becomes smaller behind the constricted portion 16, and the force for lifting the engine cover 12 becomes smaller. Therefore, for example, falling off of the engine cover 12 can be suppressed without increasing the fastening portion 13 .

（２）流路１４の断面積は、括れ部１６の前後で括れ部１６に向かって徐々に小さくされるため、空気の流れがスムーズとなる。
本実施形態は、以下のように変更して実施することができる。本実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。 (2) Since the cross-sectional area of the flow path 14 is gradually reduced toward the constricted portion 16 before and after the constricted portion 16, the air flows smoothly.
This embodiment can be implemented with the following modifications. This embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.

・上記実施形態では、括れ部１６は、凹部１５の車両前方側の幅Ａ１及び凹部１５の車両後方側の幅Ａ２よりも小さい幅Ａ３を有することで車両前方側及び車両後方側に対して流路１４の断面積が小さくされているとしたが、前後方向の中間部で流路１４の断面積を小さくできればよい。例えば、凹部の深さを前後側に比べて浅くすることで流路の断面積を小さくする括れ部を構成してもよい。また、勿論、凹部の幅を前後側に比べて小さくしつつ凹部の深さを前後側に比べて浅くすることで流路の断面積を小さくする括れ部を構成してもよい。 In the above embodiment, the constricted portion 16 has a width A3 that is smaller than the width A1 of the recess 15 on the vehicle front side and the width A2 of the recess 15 on the vehicle rear side. Although the cross-sectional area of the channel 14 is made small, it is sufficient if the cross-sectional area of the channel 14 can be made small at the intermediate portion in the front-rear direction. For example, the depth of the concave portion may be shallower than that on the front and rear sides to form a constricted portion that reduces the cross-sectional area of the flow path. Further, of course, the constricted portion may be configured to reduce the cross-sectional area of the flow path by making the width of the recess smaller than that on the front and rear sides and making the depth of the recess shallower than that on the front and back.

・上記実施形態では、凹部１５は、他の部位に対して上方（図２中、紙面奥方向）に立設される一対の側壁と、それら側壁の上端同士を繋ぐ底壁とにより構成されるとしたが、これに限定されず、例えば、エンジンカバー１２の厚さが厚い場合等は、単に凹部を凹設して（上方に突出させずに）構成してもよい。 - In the above-described embodiment, the recessed portion 15 is configured by a pair of side walls that stand upward (in the depth direction of the paper surface in FIG. 2) with respect to other portions, and a bottom wall that connects the upper ends of the side walls to each other. However, it is not limited to this, and for example, when the thickness of the engine cover 12 is thick, the concave portion may simply be recessed (without protruding upward).

・上記実施形態では、エンジンカバー１２は、エンジン１１の上面を覆うものとしたが、これに限定されず、側面や底面を覆うものとしてもよい。 - In the above embodiment, the engine cover 12 covers the upper surface of the engine 11, but is not limited to this, and may cover the side surface or the bottom surface.

１１…エンジン、１２…エンジンカバー、１４…流路、１５…凹部、１６…括れ部。 DESCRIPTION OF SYMBOLS 11... Engine, 12... Engine cover, 14... Flow path, 15... Recessed part, 16... Constricted part.

Claims (1)

車両のエンジンを車両の前後方向に沿って覆うエンジンカバーであって、
前記エンジンとの対向面側に前後方向に沿った空気の流路を構成する凹部を備え、
前記凹部は、前記エンジンとの対向面における前後方向の中間部に前記流路の断面積を小さくする括れ部を有し、
前記括れ部での前記流路の断面積は、前記流路の車両前方側の断面積及び前記流路の車両後方側の断面積よりも小さいことを特徴とするエンジンカバー。 An engine cover that covers an engine of a vehicle along the longitudinal direction of the vehicle,
A concave portion forming an air flow path along the front-rear direction is provided on the side facing the engine,
The concave portion has a constricted portion that reduces the cross-sectional area of the flow path at an intermediate portion in the front-rear direction on the surface facing the engine ,
An engine cover , wherein a cross-sectional area of the flow path at the constricted portion is smaller than a cross-sectional area of the flow path on the vehicle front side and a cross-sectional area of the flow path on the vehicle rear side .
JP2018150355A 2018-08-09 2018-08-09 engine cover Active JP7159687B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006233868A (en) 2005-02-24 2006-09-07 Toyoda Gosei Co Ltd Soundproof cover
JP2010264885A (en) 2009-05-14 2010-11-25 Honda Motor Co Ltd Under hood structure for vehicle
JP2012012961A (en) 2010-06-29 2012-01-19 Mazda Motor Corp Vehicular engine cover structure
JP2012040912A (en) 2010-08-17 2012-03-01 Pacific Ind Co Ltd Engine cover

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0173471U (en) * 1987-11-06 1989-05-17

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006233868A (en) 2005-02-24 2006-09-07 Toyoda Gosei Co Ltd Soundproof cover
JP2010264885A (en) 2009-05-14 2010-11-25 Honda Motor Co Ltd Under hood structure for vehicle
JP2012012961A (en) 2010-06-29 2012-01-19 Mazda Motor Corp Vehicular engine cover structure
JP2012040912A (en) 2010-08-17 2012-03-01 Pacific Ind Co Ltd Engine cover

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