JP5141698B2 - Air intake duct - Google Patents

Air intake duct Download PDF

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JP5141698B2
JP5141698B2 JP2010014099A JP2010014099A JP5141698B2 JP 5141698 B2 JP5141698 B2 JP 5141698B2 JP 2010014099 A JP2010014099 A JP 2010014099A JP 2010014099 A JP2010014099 A JP 2010014099A JP 5141698 B2 JP5141698 B2 JP 5141698B2
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suction
intake duct
support
support portion
wall portion
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JP2011153530A (en
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真晴 城
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Toyoda Gosei Co Ltd
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Description

本発明は、外気をエンジンに供給するための吸気ダクトに関し、詳しくはラジエータアッパサポート等の車両構成部品の上側に配置される吸気ダクトに関する。   The present invention relates to an intake duct for supplying outside air to an engine, and more particularly to an intake duct disposed on the upper side of a vehicle component such as a radiator upper support.

吸気ダクトは、ボンネットの下側に配置され、外部から吸い込んだ外気をエアクリーナ等の吸気系部材を介してエンジンに供給するための部材である。エンジンルーム内の外気は比較的高温であり、低温の外気に比べて体積が大きい。したがって、外気を効率的にエンジンに供給するために、吸気ダクトの一端部である吸入端部は、車両の進行方向前端部（すなわち、低温の外気を吸い込み得る位置）に配置されるのが好ましいとされている。車両の進行方向前端部におけるボンネットの下側には、一般に、ラジエータアッパサポート等の車両構成部品が配置されている。このため、吸気ダクトは、ボンネットの下側かつ車両構成部品の上側に配置されるのが一般的である。   The intake duct is a member that is disposed on the lower side of the bonnet and supplies outside air sucked from the outside to the engine via an intake system member such as an air cleaner. The outside air in the engine room is relatively hot and has a larger volume than the outside air at low temperatures. Therefore, in order to efficiently supply outside air to the engine, it is preferable that the suction end portion, which is one end portion of the intake duct, be disposed at the front end portion in the traveling direction of the vehicle (that is, a position where low temperature outside air can be sucked). It is said that. Generally, vehicle components such as a radiator upper support are disposed below the hood at the front end portion in the traveling direction of the vehicle. For this reason, the intake duct is generally disposed below the hood and above the vehicle component.

このような吸気ダクトには、エンジンの始動により外気を吸い込むとき等に、大きな吸気負圧が作用する。この吸気負圧により吸気ダクトが潰れ変形すると、エンジンに充分な量の外気を供給できない可能性がある。特に、吸気ダクトにおける吸入端部は横長の扁平形状に設計される場合が多く、吸気負圧により潰れ変形し易い。   A large intake negative pressure acts on such an intake duct when, for example, outside air is sucked by starting the engine. If the intake duct is crushed and deformed by this intake negative pressure, a sufficient amount of outside air may not be supplied to the engine. In particular, the suction end portion of the intake duct is often designed in a horizontally long flat shape, and is easily crushed and deformed by the negative intake pressure.

吸気負圧による吸入端部の潰れ変形を抑制するために、吸入端部の内部に高剛性の支持柱を設ける技術が提案されている（例えば、特許文献１、２参照）。特許文献１、２に紹介されている吸気ダクトによると、高剛性の支持柱によって吸入端部を補強することで、吸入端部の剛性を高めることができる。しかしその一方で、支持柱の剛性が過度に高ければ、外部から衝突等による衝撃が加わった場合にも、吸気ダクトの吸入端部が潰れ変形し難くなる。近年、歩行者保護の観点から、衝突時にボンネットを下方に向けて変形させ、この変形により衝撃を吸収する技術が提案されている。しかし、衝突時等にも吸入端部が潰れ変形しなければ、ボンネットを大きく下方に変形させ難い。さらに、吸入端部が大きく潰れ変形すると、支持柱が車両構成部品に突き当たる可能性がある。支持柱が車両構成部品に突き当たると、支持柱が突っ張ってボンネットの変形を阻害する可能性もある。   In order to suppress crushing deformation of the suction end due to negative intake pressure, a technique has been proposed in which a highly rigid support column is provided inside the suction end (see, for example, Patent Documents 1 and 2). According to the intake ducts introduced in Patent Documents 1 and 2, the rigidity of the suction end portion can be increased by reinforcing the suction end portion with a highly rigid support column. However, if the rigidity of the support column is excessively high, the suction end portion of the intake duct is not easily crushed and deformed even when an impact such as a collision is applied from the outside. In recent years, from the viewpoint of protecting pedestrians, a technique has been proposed in which a hood is deformed downward at the time of a collision and the impact is absorbed by this deformation. However, if the suction end portion is not crushed and deformed even at the time of a collision or the like, it is difficult to greatly deform the bonnet downward. Furthermore, if the suction end portion is greatly crushed and deformed, the support column may hit the vehicle component. When the support column hits the vehicle component, the support column may be stretched and hinder the deformation of the bonnet.

特開２００８−８７５７１号公報JP 2008-87571 A 特開２００９−１５０３５３号公報JP 2009-150353 A

本発明は上記事情に鑑みてなされたものであり、吸気負圧が作用した場合には吸入端部が潰れ変形し難く、外力が作用した場合には吸入端部が潰れ変形可能な吸気ダクトを提供することを目的とする。   The present invention has been made in view of the above circumstances, and an intake duct is provided in which the suction end portion is not easily crushed and deformed when an intake negative pressure is applied, and the intake end portion is crushed and deformed when an external force is applied. The purpose is to provide.

上記課題を解決する本発明の吸気ダクトは、内部空間を持つ筒状をなし、車両のボンネットと該ボンネットの下側に配置されている車両構成部品との間に配置される吸入端部を持つ吸気ダクトであって、前記吸入端部は、前記ボンネットの下側に配置される吸入上壁部と、該吸入上壁部の下側に配置され該吸入上壁部とともに前記内部空間を区画する吸入下壁部と、を持ち、該吸入下壁部と該吸入上壁部との一方には、中空状をなし該吸入上壁部と該吸入下壁部との他方に向けて***している第１支持部が形成され、該吸入下壁部と該吸入上壁部との該他方には、該第１支持部に向けて突出する板状をなし尖端形状の突出端部を持つ第２支持部が形成され、該第１支持部の頂壁の一部である破断部は、該頂壁の他の部分よりも薄肉であり、該第２支持部に対面し、該第２支持部の板厚方向と直交する方向に長手方向を向ける短冊状をなすことを特徴とする。   An intake duct of the present invention that solves the above problems has a cylindrical shape having an internal space, and has an intake end portion disposed between a vehicle hood and a vehicle component disposed below the hood. An intake duct, wherein the suction end portion is disposed on the lower side of the bonnet, and the suction upper wall portion is disposed on the lower side of the suction upper wall portion and defines the inner space together with the suction upper wall portion. A suction lower wall portion, and one of the suction lower wall portion and the suction upper wall portion has a hollow shape and protrudes toward the other of the suction upper wall portion and the suction lower wall portion. A first support portion is formed, and the other of the suction lower wall portion and the suction upper wall portion is formed in a plate shape projecting toward the first support portion and has a point-like projecting end portion. 2 support portions are formed, and the fracture portion that is a part of the top wall of the first support portion is thinner than the other portions of the top wall, It faces the second supporting portion, and wherein the forming in a direction perpendicular to the thickness direction of the second support part a strip-shaped to direct the longitudinal direction.

本発明の吸気ダクトは、下記の（１）〜（４）の何れかを備えるのが好ましく、（１）〜（４）の複数を備えるのがより好ましい。   The intake duct of the present invention preferably includes any of the following (1) to (4), and more preferably includes a plurality of (1) to (4).

（１）前記頂壁のなかで前記破断部を含む領域は、陥没形状の案内凹部を構成し、前記突出端部は該案内凹部の内部に位置している。   (1) A region including the fracture portion in the top wall constitutes a recessed guide recess, and the protruding end is located inside the guide recess.

（２）前記第１支持部は、孔状をなし前記破断部に隣接する係合部を持ち、前記突出端部は該係合部と係合している。   (2) The first support part has a hole shape and has an engaging part adjacent to the breaking part, and the protruding end part is engaged with the engaging part.

（３）前記吸入上壁部と前記吸入下壁部との前記一方は、前記第２支持部の鉛直方向下方への移動に干渉する干渉部を持つ。   (3) The one of the suction upper wall portion and the suction lower wall portion has an interference portion that interferes with the downward movement of the second support portion in the vertical direction.

（４）前記干渉部は、前記第１支持部の一部からなり、前記破断部の鉛直方向下側に突出している。   (4) The interference portion includes a part of the first support portion, and protrudes downward in the vertical direction of the fracture portion.

本発明の吸気ダクトにおける吸入端部には、第１支持部と第２支持部とが設けられている。第１支持部と第２支持部とは、互いに当接することで、上述した従来の吸気ダクトにおける支持柱と同様に吸入端部の剛性を補強する機能を持つ。このため、本発明の吸気ダクトにおける吸入端部は、吸気負圧が作用した時には潰れ変形し難い。   The suction end portion of the intake duct of the present invention is provided with a first support portion and a second support portion. The first support portion and the second support portion have a function to reinforce the rigidity of the suction end portion in the same manner as the support column in the above-described conventional intake duct by contacting each other. For this reason, the suction end portion in the intake duct of the present invention is not easily crushed and deformed when intake negative pressure is applied.

また、吸気ダクトに上下方向の大きな外力が作用すると、第２支持部が第１支持部の破断部に向けて押し付けられる。破断部は薄肉であるために、第１支持部の他の部分に比べて破断し易い。このため、本発明の吸気ダクトに上下方向の外力が作用した場合、すなわち、吸入端部に所定以上の外力が作用した場合には、第２支持部が第１支持部の破断部を切り裂くかまたは突き破って、吸入端部が上下方向に潰れ変形する。したがって、本発明の吸気ダクトは、ボンネットの変形を妨げ難い。   Further, when a large vertical force is applied to the intake duct, the second support portion is pressed toward the fracture portion of the first support portion. Since the rupture portion is thin, the rupture portion is easily ruptured as compared with other portions of the first support portion. For this reason, when an external force in the vertical direction is applied to the intake duct of the present invention, that is, when an external force of a predetermined level or more is applied to the suction end portion, the second support portion cuts the fracture portion of the first support portion. Or it breaks through and the suction end part is crushed and deformed in the vertical direction. Therefore, the intake duct of the present invention hardly prevents the bonnet from being deformed.

ところで、本発明の吸気ダクトの下側には車両構成部品が配設されている。このため、第２支持部の突出高さや、車両構成部品と吸気ダクトとの距離、吸気ダクトに外力が作用した場合（以下、衝撃発生時と呼ぶ）における外力の大きさ等によっては、衝撃発生時に第２支持部が吸入下壁部よりも下側に突出して車両構成部品に突き当たる可能性がある。   By the way, vehicle components are arranged below the intake duct of the present invention. Therefore, depending on the protruding height of the second support part, the distance between the vehicle component and the intake duct, the magnitude of the external force when an external force is applied to the intake duct (hereinafter referred to as the occurrence of an impact), etc. Sometimes, the second support portion may protrude below the lower suction wall portion and hit a vehicle component.

しかし、本発明の吸気ダクトにおける第２支持部は、板状をなすために曲がり変形し易い。このため吸入端部が大きく潰れ変形した場合、車両構成部品に突き当たった第２支持部は曲がり変形する。このため第２支持部はボンネットの変形を妨げ難い。   However, since the 2nd support part in the air intake duct of this invention makes plate shape, it is easy to bend and deform | transform. For this reason, when the suction end portion is greatly crushed and deformed, the second support portion that abuts against the vehicle component is bent and deformed. For this reason, it is difficult for the second support portion to prevent deformation of the bonnet.

上記（１）を備える本発明の吸気ダクトによると、陥没形状の案内凹部によって第２支持部の突出端部を破断部に向けて案内することで、衝撃発生時に第２支持部によって破断部を信頼性高く破断でき、吸入端部が信頼性高く潰れ変形する。   According to the intake duct of the present invention including the above (1), the projecting end portion of the second support portion is guided toward the fracture portion by the recessed guide recess, so that the second support portion causes the fracture portion to be generated when an impact occurs. It can be ruptured with high reliability, and the suction end is crushed and deformed with high reliability.

上記（２）を備える本発明の吸気ダクトによると、破断部に隣接する係合部によって、衝撃発生時に第２支持部を破断部に信頼性高く案内できる。この係合部が貫通孔状をなす場合には、係合部自体が破断部の破断開始点となり、衝撃発生時に第２支持部が破断部を信頼性高く破断し、吸入端部が信頼性高く潰れ変形する。   According to the intake duct of the present invention including the above (2), the second support portion can be reliably guided to the breakage portion when an impact occurs by the engagement portion adjacent to the breakage portion. When the engaging portion has a through-hole shape, the engaging portion itself becomes the breaking start point of the breaking portion, and when an impact occurs, the second support portion breaks the breaking portion with high reliability, and the suction end portion is reliable. Highly crushed and deformed.

上記（３）または（４）を備える本発明の吸気ダクトによると、破断部を破断した第２支持部は、干渉部に干渉されて鉛直方向下方に移動できない。このため第２支持部は、干渉部に当接する位置まで移動すると、曲がり変形する。したがって第２支持部は吸気ダクトの下側に配設されている車両構成部品に干渉し難い。また干渉部によって曲がり変形した第２支持部は、車両構成部品に干渉する際に、車両構成部品に対して傾斜して当接する。このため第２支持部はその後さらに曲がり変形する。したがって第２支持部は、車両構成部品に干渉する場合にも突っ張らない。よって、上記（３）または（４）を備える本発明の吸気ダクトは、より一層にボンネットの変形に干渉し難い。   According to the intake duct of the present invention including the above (3) or (4), the second support part that has broken the broken part is interfered by the interference part and cannot move downward in the vertical direction. For this reason, if the 2nd support part moves to the position which contacts an interference part, it will bend and change. Therefore, the second support portion is unlikely to interfere with vehicle components disposed below the intake duct. Further, the second support portion bent and deformed by the interference portion inclines and contacts the vehicle component when interfering with the vehicle component. Therefore, the second support portion is further bent and deformed thereafter. Therefore, the second support portion does not stretch even when it interferes with the vehicle components. Therefore, the intake duct of the present invention having the above (3) or (4) is more unlikely to interfere with the deformation of the bonnet.

実施例１の吸気ダクトを模式的に表す要部拡大斜視図である。FIG. 3 is an enlarged perspective view of a main part schematically showing an intake duct according to the first embodiment. 実施例１の吸気ダクトを前後方向に切断した様子を模式的に表す断面図である。It is sectional drawing which represents typically a mode that the air intake duct of Example 1 was cut | disconnected in the front-back direction. 実施例１の吸気ダクトを左右方向に切断した様子を模式的に表す断面図である。It is sectional drawing which represents typically a mode that the air intake duct of Example 1 was cut | disconnected in the left-right direction. 実施例１の吸気ダクトを左右方向に切断した様子を模式的に表す断面図である。It is sectional drawing which represents typically a mode that the air intake duct of Example 1 was cut | disconnected in the left-right direction. 実施例２の吸気ダクトを前後方向に切断した様子を模式的に表す断面図である。It is sectional drawing which represents typically a mode that the air intake duct of Example 2 was cut | disconnected in the front-back direction. 実施例２の吸気ダクトを左右方向に切断した様子を模式的に表す断面図である。It is sectional drawing which represents typically a mode that the air intake duct of Example 2 was cut | disconnected in the left-right direction. 実施例３の吸気ダクトを前後方向に切断した様子を模式的に表す断面図である。It is sectional drawing which represents typically a mode that the air intake duct of Example 3 was cut | disconnected in the front-back direction. 実施例３の吸気ダクトを図７中Ａ−Ａ位置で切断した様子を模式的に表す断面図である。It is sectional drawing which represents typically a mode that the air intake duct of Example 3 was cut | disconnected in the AA position in FIG. 実施例３の吸気ダクトを図７中Ａ−Ａ位置で切断した様子を模式的に表す断面図である。It is sectional drawing which represents typically a mode that the air intake duct of Example 3 was cut | disconnected in the AA position in FIG. 実施例３の吸気ダクトにおける第１支持部を成形するための成形型を模式的に表す断面図である。FIG. 6 is a cross-sectional view schematically showing a forming die for forming a first support portion in an air intake duct of Example 3. 実施例３の吸気ダクトにおける第１支持部を成形するための成形型を模式的に表す断面図である。FIG. 6 is a cross-sectional view schematically showing a forming die for forming a first support portion in an air intake duct of Example 3. 実施例４の吸気ダクトを前後方向に切断した様子を模式的に表す断面図である。It is sectional drawing which represents typically a mode that the air intake duct of Example 4 was cut | disconnected in the front-back direction. 実施例４の吸気ダクトを図１２中Ｃ−Ｃ位置で切断した様子を模式的に表す要部拡大断面図である。FIG. 13 is an essential part enlarged cross-sectional view schematically showing a state where the intake duct of Example 4 is cut at a position CC in FIG. 12. 実施例４の吸気ダクトにおける吸入下壁部を成形するための成形型を模式的に表す断面図である。FIG. 10 is a cross-sectional view schematically showing a molding die for molding the lower suction wall portion in the intake duct of the fourth embodiment. 実施例４の吸気ダクトにおける吸入下壁部を成形するための成形型を模式的に表す断面図である。FIG. 10 is a cross-sectional view schematically showing a molding die for molding the lower suction wall portion in the intake duct of the fourth embodiment.

本発明の吸気ダクトにおける第１支持部と第２支持部とは、吸気負圧を受けた時に当接すれば良く、車両のエンジン停止時には、互いに離間していても良いし、当接していても良い。   The first support portion and the second support portion in the intake duct of the present invention may be in contact with each other when receiving intake negative pressure, and may be separated from each other or in contact when the vehicle engine is stopped. good.

以下、本発明の吸気ダクトを具体的に説明する。   Hereinafter, the intake duct of the present invention will be specifically described.

（実施例１）
実施例１の吸気ダクトは、上記（１）を備える。実施例１の吸気ダクトを模式的に表す要部拡大斜視図を図１に示す。実施例１の吸気ダクトを前後方向（車両進行方向）に切断した様子を模式的に表す断面図を図２に示す。実施例１の吸気ダクトを左右方向（車幅方向）に切断した様子を模式的に表す断面図を図３、４に示す。なお、図４は、実施例１の吸気ダクトにおける吸入端部が潰れ変形している様子を表す。以下、本明細書において、上、下、左、右、前、後とは、図１に示す上、下、左、右、前、後を指す。 Example 1
The intake duct of the first embodiment includes the above (1). The principal part expansion perspective view which represents typically the air intake duct of Example 1 is shown in FIG. FIG. 2 is a cross-sectional view schematically showing a state in which the intake duct of the first embodiment is cut in the front-rear direction (vehicle traveling direction). 3 and 4 are sectional views schematically showing a state where the intake duct of the first embodiment is cut in the left-right direction (vehicle width direction). FIG. 4 shows a state in which the suction end portion of the intake duct of the first embodiment is crushed and deformed. Hereinafter, in this specification, the terms “up,” “down,” “left,” “right,” “front,” and “rear” refer to “upper, lower, left, right, front, and rear” shown in FIG.

実施例１の吸気ダクト１は、樹脂製であり筒状をなす。詳しくは、吸気ダクト１は、断面略矩形状の一般部５と、一般部５よりもやや大径の吸入端部２とを持つ。図２〜４に示すように、吸入端部２は、車両のボンネット９０の下側かつラジエータアッパサポート９１の上側に配設される。一般部５は、図略のエアクリーナケースに接続される。一般部５の上側部分（一般上壁部５０）と吸入端部２の上側部分（吸入上壁部３）とは一体に射出成形されてなる。また、一般部５の下側部分（一般下壁部５１）と吸入端部２の下側部分（吸入下壁部４）とは一体に射出成形されてなる。一般上壁部５０と吸入上壁部３との一体品と、一般下壁部５１と吸入下壁部４との一体品とは、爪嵌合により一体化されている。吸入上壁部３と吸入下壁部４とで吸入端部２が構成され、吸入上壁部３と吸入下壁部４とは、吸入端部２における内部空間６を区画している。   The intake duct 1 of the first embodiment is made of resin and has a cylindrical shape. Specifically, the intake duct 1 has a general portion 5 having a substantially rectangular cross section and a suction end portion 2 having a slightly larger diameter than the general portion 5. As shown in FIGS. 2 to 4, the suction end 2 is disposed below the hood 90 of the vehicle and above the radiator upper support 91. The general part 5 is connected to an air cleaner case (not shown). The upper part (general upper wall part 50) of the general part 5 and the upper part (suction upper wall part 3) of the suction end part 2 are integrally formed by injection molding. Further, the lower part (general lower wall part 51) of the general part 5 and the lower part (suction lower wall part 4) of the suction end part 2 are integrally formed by injection molding. The integrated product of the general upper wall portion 50 and the suction upper wall portion 3 and the integrated product of the general lower wall portion 51 and the suction lower wall portion 4 are integrated by claw fitting. The suction upper wall portion 3 and the suction lower wall portion 4 constitute the suction end portion 2, and the suction upper wall portion 3 and the suction lower wall portion 4 define an internal space 6 in the suction end portion 2.

吸入上壁部３は、下方に突出する板状の第２支持部３０を持つ。詳しくは、第２支持部３０は、板厚方向を左右方向に向け、前後方向に（すなわち、車両の進行方向に沿って）延びている。第２支持部３０は尖端形状の突出端部３１を前側に持つ略刀状をなす。   The suction upper wall portion 3 has a plate-like second support portion 30 protruding downward. Specifically, the second support portion 30 extends in the front-rear direction (that is, along the traveling direction of the vehicle) with the plate thickness direction in the left-right direction. The 2nd support part 30 makes the substantially sword shape which has the tip-shaped protrusion end part 31 in the front side.

吸入下壁部４は、上方に***する第１支持部４０を持つ。第１支持部４０は、頂壁４１と側壁４２とを持ち下方（吸入下壁部４の下側）に開口する中空状をなす。頂壁４１の略中央部分からなる破断部４３は、吸気ダクト１の他の部分に比べて薄肉である。詳しくは、破断部４３の肉厚は、他の部分の肉厚の５〜２０％程度である。図１に示すように、破断部４３は、短冊状をなし、長手方向を前後方向に向けている。破断部４３及び破断部４３の周縁部は、頂壁４１の他の部分に比べて下側に陥没している。この陥没した部分を案内凹部４５と呼ぶ。案内凹部４５は、破断部４３と同様に、長手方向を前後方向に向けている。案内凹部４５の内部には、第２支持部３０の突出端部３１が配置されている。突出端部３１は破断部４３に対面している。   The suction lower wall portion 4 has a first support portion 40 that protrudes upward. The first support portion 40 has a top wall 41 and a side wall 42 and has a hollow shape that opens downward (below the lower suction wall portion 4). The break portion 43 formed by the substantially central portion of the top wall 41 is thinner than the other portions of the intake duct 1. In detail, the thickness of the fracture | rupture part 43 is about 5 to 20% of the thickness of another part. As shown in FIG. 1, the fracture | rupture part 43 comprises strip shape and has set the longitudinal direction to the front-back direction. The rupture part 43 and the peripheral part of the rupture part 43 are depressed below the other parts of the top wall 41. This depressed portion is referred to as a guide recess 45. As with the fractured portion 43, the guide concave portion 45 has the longitudinal direction directed in the front-rear direction. The protruding end portion 31 of the second support portion 30 is disposed inside the guide recess 45. The protruding end portion 31 faces the fracture portion 43.

図１〜３に示すように、実施例１の吸気ダクト１に吸気負圧が作用すると、第１支持部４０と第２支持部３０とが互いに当接し、吸入端部２を補強する。このため実施例１の吸気ダクト１における吸入端部２は、吸気負圧が作用しても潰れ変形し難い。   As shown in FIGS. 1 to 3, when an intake negative pressure acts on the intake duct 1 of the first embodiment, the first support portion 40 and the second support portion 30 come into contact with each other and reinforce the suction end portion 2. For this reason, the suction end 2 in the intake duct 1 of the first embodiment is not easily crushed and deformed even when intake negative pressure acts.

また、破断部４３は薄肉かつ短冊状をなし、かつ、突出端部３１は尖端形状をなす。このため破断部４３には衝撃発生時（すなわち吸気ダクト１に上下方向の大きな外力が作用した時）における応力が集中し易い。したがって図４に示すように、衝撃発生時には突出端部３１は破断部４３を突き破る。換言すると、衝撃発生時には、第２支持部３０の突出端部３１は第１支持部４０の破断部４３よりも下側にまで移動する。したがって、このとき吸入端部２は上下方向に潰れ変形する。よって、実施例１の吸気ダクト１はボンネット９０の変形を妨げ難い。なお、突出端部３１は案内凹部４５の内部に配置されている。このため衝撃発生時には、突出端部３１は信頼性高く破断部４３に当接し破断部４３を突き破る。   Moreover, the fracture | rupture part 43 makes | forms thin and strip shape, and the protrusion end part 31 makes | forms a pointed shape. For this reason, stress at the time of impact occurrence (that is, when a large external force in the vertical direction acts on the intake duct 1) tends to concentrate on the fracture portion 43. Therefore, as shown in FIG. 4, the projecting end portion 31 breaks through the fracture portion 43 when an impact occurs. In other words, when an impact occurs, the protruding end portion 31 of the second support portion 30 moves to a lower side than the fracture portion 43 of the first support portion 40. Therefore, at this time, the suction end 2 is crushed and deformed in the vertical direction. Therefore, the intake duct 1 of the first embodiment is difficult to prevent the bonnet 90 from being deformed. The protruding end 31 is disposed inside the guide recess 45. For this reason, when an impact occurs, the protruding end 31 contacts the rupture 43 with high reliability and breaks through the rupture 43.

さらに、第２支持部３０は板状をなし曲がり変形可能である。このため第２支持部３０は、吸入端部２が衝撃発生時に大きく潰れ変形した場合には、車両構成部品（実施例１ではラジエータアッパサポート９１）に突き当たって曲がり変形する。換言すると、第２支持部３０は、板状をなすために、車両構成部品に突き当たっても突っ張り難い。このことによっても実施例１の吸気ダクト１はボンネット９０の変形に干渉し難い。   Further, the second support portion 30 has a plate shape and can be bent and deformed. For this reason, when the suction end portion 2 is greatly crushed and deformed when an impact occurs, the second support portion 30 abuts against the vehicle component (the radiator upper support 91 in the first embodiment) and bends and deforms. In other words, since the second support portion 30 has a plate shape, it is difficult to stretch even if it hits the vehicle component. This also makes it difficult for the intake duct 1 of the first embodiment to interfere with the deformation of the bonnet 90.

（実施例２）
実施例２の吸気ダクトは、上記（１）、（２）を備える。実施例２の吸気ダクトを前後方向に切断した様子を模式的に表す断面図を図５に示す。実施例２の吸気ダクトを左右方向に切断した様子を模式的に表す断面図を図６に示す。 (Example 2)
The intake duct of the second embodiment includes the above (1) and (2). FIG. 5 is a cross-sectional view schematically showing a state where the intake duct of the second embodiment is cut in the front-rear direction. FIG. 6 is a cross-sectional view schematically showing a state in which the intake duct of Example 2 is cut in the left-right direction.

実施例２の吸気ダクト１は、第１支持部４０の形状及び第２支持部３０の形状以外は、実施例１の吸気ダクト１と同じものである。   The intake duct 1 of the second embodiment is the same as the intake duct 1 of the first embodiment except for the shape of the first support portion 40 and the shape of the second support portion 30.

第１支持部４０の頂壁４１には、貫通孔状の係合部４６が形成されている。係合部４６は破断部４３の後側に隣接している。第２支持部３０は、突出端部３１を後側に向けた刀状をなす。第２支持部３０の突出端部３１は係合部４６に挿入されている。このため第２支持部３０の突出端部３１は係合部４６と係合している。なお係合部４６は、貫通孔状をなすものの、突出端部３１によって塞がれている。   The top wall 41 of the first support portion 40 is formed with a through-hole engaging portion 46. The engaging portion 46 is adjacent to the rear side of the fracture portion 43. The second support portion 30 has a sword shape with the protruding end portion 31 facing rearward. The protruding end portion 31 of the second support portion 30 is inserted into the engaging portion 46. For this reason, the protruding end portion 31 of the second support portion 30 is engaged with the engaging portion 46. The engaging portion 46 has a through-hole shape, but is closed by the protruding end portion 31.

実施例２の吸気ダクト１における吸入端部２は、実施例１の吸気ダクト１と同様に、第１支持部４０と第２支持部３０とによって補強されているために、吸気負圧が作用しても潰れ変形し難い。   Since the suction end portion 2 in the intake duct 1 of the second embodiment is reinforced by the first support portion 40 and the second support portion 30 in the same manner as the intake duct 1 of the first embodiment, intake negative pressure acts. However, it is difficult to be crushed and deformed.

また、衝撃発生時には、係合部４６が破断開始点となり、破断部４３が第２支持部３０によって切り裂かれる。第２支持部３０の突出端部３１は、係合部４６によって位置決めされているため、衝撃発生時には破断部４３を信頼性高く切り裂く。このため実施例２の吸気ダクト１における吸入端部２は、衝撃発生時には潰れ変形し、ボンネット９０の変形に干渉し難い。   In addition, when an impact occurs, the engaging portion 46 becomes a breaking start point, and the breaking portion 43 is torn by the second support portion 30. Since the protruding end portion 31 of the second support portion 30 is positioned by the engaging portion 46, the breaking portion 43 is torn up with high reliability when an impact occurs. For this reason, the suction end 2 in the intake duct 1 of the second embodiment is crushed and deformed when an impact occurs, and hardly interferes with the deformation of the hood 90.

（実施例３）
実施例３の吸気ダクトは、上記（１）〜（３）を備える。実施例３の吸気ダクトを前後方向に切断した様子を模式的に表す断面図を図７に示す。実施例３の吸気ダクトを図７中Ａ−Ａ位置で切断した様子を模式的に表す断面図を図８、図９に示す。実施例３の吸気ダクトにおける吸入下壁部を成形するための成形型を模式的に表す断面図を図１０、図１１に示す。なお、図９は、実施例３の吸気ダクトにおける吸入端部が潰れ変形している様子を表す。図１０に示す吸入下壁部の切断面は、図７中Ｂ−Ｂ位置における切断面である。図１１に示す吸入下壁部の切断面は、図７中Ａ−Ａ位置における切断面である。 (Example 3)
The intake duct of the third embodiment includes the above (1) to (3). FIG. 7 is a cross-sectional view schematically showing a state where the intake duct of the third embodiment is cut in the front-rear direction. 8 and 9 are cross-sectional views schematically showing a state in which the intake duct of the third embodiment is cut at the position AA in FIG. 10 and 11 are cross-sectional views schematically showing a mold for molding the lower suction wall portion in the intake duct of the third embodiment. FIG. 9 shows a state where the suction end portion of the intake duct of the third embodiment is crushed and deformed. The cut surface of the lower suction wall portion shown in FIG. 10 is a cut surface at the BB position in FIG. The cut surface of the lower suction wall portion shown in FIG. 11 is a cut surface at the position AA in FIG.

実施例３の吸気ダクト１は、第１支持部４０の形状及び第２支持部３０の形状以外は、実施例２の吸気ダクト１と同じものである。   The intake duct 1 of the third embodiment is the same as the intake duct 1 of the second embodiment except for the shape of the first support portion 40 and the shape of the second support portion 30.

吸入下壁部４は干渉部４７を持つ。干渉部４７は、第１支持部４０の一部からなり、第１支持部４０の頂壁４１よりも下側に配置され、第１支持部４０の内部に突出している。詳しくは、図８に示すように、干渉部４７は、第１支持部４０の頂壁４１及び左側壁４２ａに一体化され、第１支持部４０の内部において右側に向けて突出している。干渉部４７の突出端面（図８中右側の端面）における上側部分は、左上側から右下側に向けて傾斜するテーパ面４８である。干渉部４７の突出端面における下側部分は、略鉛直方向に延びる平面４９である。テーパ面４８の下側部分は、破断部４３の鉛直方向の下側に突出している。平面４９はテーパ面４８の下側部分に連続し、破断部４３の鉛直方向の下側に配置されている。   The lower suction wall portion 4 has an interference portion 47. The interference portion 47 is formed of a part of the first support portion 40, is disposed below the top wall 41 of the first support portion 40, and protrudes into the first support portion 40. Specifically, as shown in FIG. 8, the interference part 47 is integrated with the top wall 41 and the left side wall 42 a of the first support part 40, and protrudes toward the right side inside the first support part 40. The upper portion of the protruding end surface (the right end surface in FIG. 8) of the interference portion 47 is a tapered surface 48 that is inclined from the upper left side toward the lower right side. The lower part of the protruding end surface of the interference part 47 is a plane 49 extending in a substantially vertical direction. The lower portion of the tapered surface 48 protrudes downward in the vertical direction of the fracture portion 43. The flat surface 49 is continuous with the lower portion of the tapered surface 48 and is disposed on the lower side in the vertical direction of the fracture portion 43.

実施例３の吸気ダクト１における吸入端部２は、実施例１及び実施例２の吸気ダクト１と同様に、第１支持部４０と第２支持部３０とによって補強されているために、吸気負圧が作用しても潰れ変形し難い。   The suction end portion 2 in the intake duct 1 of the third embodiment is reinforced by the first support portion 40 and the second support portion 30 in the same manner as the intake duct 1 of the first and second embodiments. Even if negative pressure acts, it is hard to be crushed and deformed.

また、衝撃発生時には、係合部４６が破断開始点となり、破断部４３が第２支持部３０によって切り裂かれる。第２支持部３０の突出端部３１は、係合部４６によって位置決めされているため、衝撃発生時には破断部４３を信頼性高く切り裂く。さらに、図９に示すように、破断部４３を切り裂いた突出端部３１は、破断部４３の鉛直方向の下側に配置されている干渉部４７（より詳しくはテーパ面４８）に案内されることで曲がり変形する。このため吸気ダクト１の吸入端部２が大きく潰れ変形しても、突出端部３１は車両構成部品９１に干渉し難い。また、干渉部４７に案内されて曲がり変形した第２支持部３０は、さらに下側に移動すると、車両構成部品９１に干渉する。しかし、第２支持部３０は曲がり変形しているために、車両構成部品９１に対して傾斜して当接する。このため第２支持部３０は、車両構成部品９１に案内されてさらに曲がり変形する。したがって第２支持部３０は、車両構成部品９１に干渉する場合にも突っ張らない。よって実施例３の吸気ダクト１における吸入端部２は、衝撃発生時には潰れ変形し、ボンネット９０の変形に干渉し難い。   In addition, when an impact occurs, the engaging portion 46 becomes a breaking start point, and the breaking portion 43 is torn by the second support portion 30. Since the protruding end portion 31 of the second support portion 30 is positioned by the engaging portion 46, the breaking portion 43 is torn up with high reliability when an impact occurs. Further, as shown in FIG. 9, the projecting end portion 31 obtained by cutting the fracture portion 43 is guided by an interference portion 47 (more specifically, a taper surface 48) disposed on the lower side in the vertical direction of the fracture portion 43. It bends and deforms. For this reason, even if the suction end portion 2 of the intake duct 1 is largely crushed and deformed, the protruding end portion 31 hardly interferes with the vehicle component 91. Further, when the second support portion 30 that has been bent and deformed while being guided by the interference portion 47 further moves downward, it interferes with the vehicle component 91. However, since the second support portion 30 is bent and deformed, the second support portion 30 is inclined and comes into contact with the vehicle component 91. Therefore, the second support portion 30 is further bent and deformed while being guided by the vehicle component 91. Therefore, the second support portion 30 does not stretch even when it interferes with the vehicle component 91. Therefore, the suction end portion 2 in the intake duct 1 of the third embodiment is crushed and deformed when an impact occurs, and hardly interferes with the deformation of the bonnet 90.

実施例３の吸気ダクト１における吸入下壁部４を成形するための成形型は、図１０に示すように、吸入下壁部４の上面を成形するための上型７０と、吸入下壁部４の下面を成形するための下型７１と、を持つ。図１０、１１に示すように、下型７１は第１支持部４０の内部および干渉部４７の平面４９を成形し、上型７０は係合部４６及び干渉部４７のテーパ面４８を成形する。このため、上型７０は上方に型開きでき、下型７１は下方に型開きできる。つまり、実施例３の吸気ダクト１における吸入下壁部４はアンダーカット形状となる部分を持たず、吸入下壁部４を成形するための成形型はスライドコア等を要さない。したがって、実施例３の吸気ダクト１は、干渉部４７を持ちかつ容易に成形できる。   As shown in FIG. 10, the mold for molding the lower suction wall portion 4 in the intake duct 1 of the third embodiment includes an upper mold 70 for molding the upper surface of the lower suction wall portion 4, and the lower suction wall portion. 4 and a lower mold 71 for molding the lower surface of 4. As shown in FIGS. 10 and 11, the lower die 71 forms the inside of the first support portion 40 and the flat surface 49 of the interference portion 47, and the upper die 70 shapes the engagement portion 46 and the tapered surface 48 of the interference portion 47. . Therefore, the upper mold 70 can be opened upward and the lower mold 71 can be opened downward. That is, the suction lower wall portion 4 in the intake duct 1 of the third embodiment does not have a portion having an undercut shape, and the molding die for molding the suction lower wall portion 4 does not require a slide core or the like. Therefore, the intake duct 1 of the third embodiment has the interference portion 47 and can be easily formed.

（実施例４）
実施例４の吸気ダクトは、上記（１）〜（３）を備える。実施例４の吸気ダクトを前後方向に切断した様子を模式的に表す断面図を図１２に示す。実施例４の吸気ダクトを図１２中Ｃ−Ｃ位置で切断した様子を模式的に表す要部拡大断面図を図１３に示す。実施例４の吸気ダクトにおける吸入下壁部を成形するための成形型を模式的に表す断面図を図１４、図１５に示す。なお、図１４に示す吸入下壁部の切断面は、図１２中Ｃ−Ｃ位置における切断面である。図１５に示す吸入下壁部の切断面は、図１２中Ｂ−Ｂ位置における切断面である。 Example 4
The intake duct of the fourth embodiment includes the above (1) to (3). FIG. 12 is a cross-sectional view schematically showing a state where the intake duct of the fourth embodiment is cut in the front-rear direction. FIG. 13 is an enlarged cross-sectional view of a main part schematically showing a state where the intake duct of the fourth embodiment is cut at the position CC in FIG. 14 and 15 are cross-sectional views schematically showing a mold for molding the lower suction wall portion in the intake duct of the fourth embodiment. In addition, the cut surface of the suction | inhalation lower wall part shown in FIG. 14 is a cut surface in CC position in FIG. The cut surface of the lower suction wall portion shown in FIG. 15 is a cut surface at the BB position in FIG.

実施例４の吸気ダクト１は、第１支持部４０および第２支持部３０の形状以外は実施例３の吸気ダクト１と同じものである。   The intake duct 1 of the fourth embodiment is the same as the intake duct 1 of the third embodiment except for the shapes of the first support portion 40 and the second support portion 30.

第２支持部３０の後端部は、第１支持部４０の後端部（後側壁４２ｂ）よりも後側に配置されている。干渉部４７は、第１支持部４０の後側壁４２ｂに形成されている。詳しくは、干渉部４７は図１２に示すように後側に突出し、図１３に示すように左上側から右下側に向けて傾斜する板状をなす。   The rear end portion of the second support portion 30 is disposed on the rear side of the rear end portion (rear side wall 42b) of the first support portion 40. The interference part 47 is formed on the rear side wall 42 b of the first support part 40. Specifically, the interference portion 47 protrudes rearward as shown in FIG. 12, and has a plate shape inclined from the upper left side toward the lower right side as shown in FIG.

衝撃発生時には、第２支持部３０は先ず破断部４３を切り裂き、次いで頂壁４１のなかで破断部４３の後側に位置する部分および後側壁４２ｂを切り裂く。図１３に示すように、干渉部４７は第２支持部３０の鉛直方向下方への移動に干渉し、第２支持部３０の後側部分を右側に向けて案内する。このため衝撃発生時に破断部４３（及び頂壁４１、後側壁４２ｂ）を切り裂いた第２支持部３０は曲がり変形し、車両構成部品に干渉し難い。   When an impact occurs, the second support portion 30 first tears the fracture portion 43, and then tears the portion of the top wall 41 located on the rear side of the fracture portion 43 and the rear side wall 42 b. As shown in FIG. 13, the interference part 47 interferes with the downward movement of the second support part 30 in the vertical direction, and guides the rear part of the second support part 30 toward the right side. For this reason, when the impact occurs, the second support part 30 that has cut through the fractured part 43 (and the top wall 41 and the rear side wall 42b) is bent and deformed, and hardly interferes with the vehicle components.

実施例４の吸気ダクト１における吸入端部２は、実施例１〜実施例３の吸気ダクト１と同様に、第１支持部４０と第２支持部３０とによって補強されているために、吸気負圧が作用しても潰れ変形し難い。   The suction end 2 in the intake duct 1 of the fourth embodiment is reinforced by the first support portion 40 and the second support portion 30 in the same manner as the intake duct 1 of the first to third embodiments. Even if negative pressure acts, it is hard to be crushed and deformed.

実施例４の吸気ダクト１における吸入下壁部４を成形するための成形型は、図１４に示すように、吸入下壁部４の上面を成形するための上型７０と、吸入下壁部４の下面を成形するための下型７１と、を持つ。図１４、１５に示すように、下型７１は第１支持部４０の内部を成形し、上型７０は係合部４６及び干渉部４７を成形する。第１支持部４０の右側壁４２ｃの傾斜角度と干渉部４７の傾斜角度とは略同じ角度である。図１４及び図１５中白抜き矢印で示すように、上型７０の型開き方向は干渉部４７及び左側壁４４の傾斜方向と略同じ方向である。このため、実施例４の吸気ダクト１における吸入下壁部４はアンダーカット形状となる部分を持たず、吸入下壁部４を成形するための成形型はスライドコア等を要さない。したがって、実施例４の吸気ダクト１は、干渉部４７を持ちかつ容易に成形できる。   As shown in FIG. 14, a mold for molding the suction lower wall portion 4 in the intake duct 1 of the fourth embodiment includes an upper mold 70 for molding the upper surface of the suction lower wall portion 4, and a suction lower wall portion. 4 and a lower mold 71 for molding the lower surface of 4. As shown in FIGS. 14 and 15, the lower mold 71 molds the inside of the first support part 40, and the upper mold 70 molds the engaging part 46 and the interference part 47. The inclination angle of the right side wall 42c of the first support part 40 and the inclination angle of the interference part 47 are substantially the same angle. As shown by white arrows in FIGS. 14 and 15, the mold opening direction of the upper mold 70 is substantially the same as the inclination direction of the interference portion 47 and the left side wall 44. For this reason, the lower suction wall portion 4 in the intake duct 1 of the fourth embodiment does not have an undercut portion, and the molding die for molding the lower suction wall portion 4 does not require a slide core or the like. Therefore, the intake duct 1 of the fourth embodiment has the interference portion 47 and can be easily formed.

１：吸気ダクト ２：吸入端部 ３：吸入上壁部
３０：第２支持部 ３１：突出端部 ４：吸入下壁部
４０：第１支持部 ４１：第１支持部の頂壁 ４３：破断部
４５：案内凹部 ４６：係合部 ５：一般部
６：内部空間 ９０：ボンネット ９１：車両構成部品 1: suction duct 2: suction end 3: suction upper wall 30: second support 31: protruding end 4: suction lower wall 40: first support 41: top wall of first support 43: fracture Portion 45: Guide recess 46: Engagement portion 5: General portion 6: Internal space 90: Bonnet 91: Vehicle component

Claims (5)

内部空間を持つ筒状をなし、車両のボンネットと該ボンネットの下側に配置されている車両構成部品との間に配置される吸入端部を持つ吸気ダクトであって、
前記吸入端部は、前記ボンネットの下側に配置される吸入上壁部と、該吸入上壁部の下側に配置され該吸入上壁部とともに前記内部空間を区画する吸入下壁部と、を持ち、
該吸入下壁部と該吸入上壁部との一方には、中空状をなし該吸入上壁部と該吸入下壁部との他方に向けて***している第１支持部が形成され、
該吸入下壁部と該吸入上壁部との該他方には、該第１支持部に向けて突出する板状をなし尖端形状の突出端部を持つ第２支持部が形成され、
該第１支持部の頂壁の一部である破断部は、該頂壁の他の部分よりも薄肉であり、該第２支持部に対面し、該第２支持部の板厚方向と直交する方向に長手方向を向ける短冊状をなすことを特徴とする吸気ダクト。 An air intake duct having a suction end disposed between a vehicle bonnet and a vehicle component disposed below the bonnet, having a cylindrical shape with an internal space,
The suction end portion is a suction upper wall portion disposed below the bonnet, a suction lower wall portion disposed below the suction upper wall portion and defining the internal space together with the suction upper wall portion, Have
One of the suction lower wall portion and the suction upper wall portion is formed with a first support portion that is hollow and protrudes toward the other of the suction upper wall portion and the suction lower wall portion,
On the other side of the suction lower wall portion and the suction upper wall portion, a second support portion having a plate-like shape protruding toward the first support portion and having a pointed protruding end portion is formed.
The fracture portion, which is a part of the top wall of the first support portion, is thinner than other portions of the top wall, faces the second support portion, and is orthogonal to the thickness direction of the second support portion. An air intake duct characterized in that it has a strip shape with its longitudinal direction facing the direction of the air. 前記頂壁のなかで前記破断部を含む領域は、陥没形状の案内凹部を構成し、
前記突出端部は該案内凹部の内部に位置している請求項１に記載の吸気ダクト。 The region including the fracture portion in the top wall constitutes a recessed guide recess,
The intake duct according to claim 1, wherein the protruding end portion is located inside the guide recess. 前記第１支持部は、孔状をなし前記破断部に隣接する係合部を持ち、
前記突出端部は該係合部と係合している請求項１または請求項２に記載の吸気ダクト。 The first support portion has a hole shape and has an engaging portion adjacent to the fracture portion,
The intake duct according to claim 1, wherein the protruding end portion is engaged with the engaging portion. 前記吸入上壁部と前記吸入下壁部との前記一方は、前記第２支持部の鉛直方向下方への移動に干渉する干渉部を持つ請求項１〜請求項３の何れか一つに記載の吸気ダクト。   The said one of the said suction upper wall part and the said suction lower wall part has an interference part which interferes with the movement to the perpendicular direction downward direction of the said 2nd support part. Intake duct. 前記干渉部は、前記第１支持部の一部からなり、前記破断部の鉛直方向下側に突出している請求項４に記載の吸気ダクト。   The intake duct according to claim 4, wherein the interference portion is formed of a part of the first support portion and protrudes downward in the vertical direction of the fracture portion.
JP2010014099A 2010-01-26 2010-01-26 Air intake duct Expired - Fee Related JP5141698B2 (en)

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