JP2017071354A - Vehicle air intake duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly allow an installation part to be displaced rearward at the time of vehicle collision.SOLUTION: A vehicle air intake duct 20 comprises a cylindrical duct body 22 which defines an air flow passage 22a, and a mounting part 28 which is formed in a plate shape extending from the duct body 22 on the intake port 24 side of the duct body 22 and fixed by a bolt 16 connected to the installation part 11 through a mounting hole 30 penetrating in the plate thickness direction. The rear edge of the mounting part 28 is formed with a part to be broken 32 which is broken by relative rearward displacement of the installation part 11 at the time of vehicle collision to allow the bolt 16 to be pulled out from the mounting hole 30. The part to be broken 32 is formed closer to the root side of the mounting part 28 connected to the duct body 22 than a line L1 passing through the center of the mounting hole 30 in the front-rear direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle intake duct that introduces air into an engine.

  In many automobiles (vehicles), an engine is mounted in an engine room defined at the front of the vehicle body. This engine burns an air-fuel mixture that is a mixture of air introduced through an air cleaner (intake device) installed in the engine room and fuel supplied from a fuel tank. It is indispensable to supply continuously and stably. Therefore, a vehicle intake duct for introducing outside air connected to the air cleaner is installed on the front side of the engine room, and air outside the vehicle is taken in and guided to the air cleaner.

  The vehicle intake duct is fixed to the vehicle body by fastening bolts passed through the left and right bolt insertion portions to the upper surface of the radiator support (see, for example, Patent Document 1). The vehicle intake duct of Patent Document 1 is formed in a long hole shape in which one bolt insertion portion extends in the front-rear direction, and is formed in a concave shape in which the other bolt insertion portion opens to the rear side. When the vehicle collides and the radiator support is displaced to the rear side, the rearward movement of the bolt passed through the front region of the bolt insertion portion is allowed, regardless of whether the radiator support is displaced backward. The vehicle intake duct can be prevented from moving from the installation position. Thus, the vehicle intake duct is prevented from colliding with and being damaged by the equipment disposed on the rear side of the vehicle intake duct due to the rearward displacement of the vehicle intake duct at the time of a vehicle collision.

Japanese Patent No. 4096608

  In the mounting structure of Patent Document 1, since the rear side of the bolt insertion part is open, when the collar is press-fitted into the bolt insertion part, the opening side of the rear side of the bolt insertion part is opened, and the collar is misaligned to cause vehicle intake. The duct is displaced from the normal mounting position. Moreover, since the bolt insertion part of patent document 1 is opened at the rear side, the holding power of the collar is weak, and using a collar with a special shape to secure a predetermined holding force leads to an increase in cost. .

  That is, the present invention has been proposed in view of the above-described problems related to the prior art and preferably solves these problems, and is a vehicle intake system that can allow a relative rearward displacement of the installation portion on the vehicle body side in the event of a vehicle collision. The purpose is to provide a duct.

In order to overcome the above-mentioned problems and achieve an intended object, a vehicle air intake duct according to claim 1 of the present application includes:
A cylindrical duct main body that defines an air flow passage that leads from an intake port disposed on the front side of the vehicle body to a delivery port connected to the engine side mounted on the vehicle body on the rear side of the intake port;
Mounting that is formed in a plate shape extending from the duct body on the intake side of the duct body, and is fixed by a fastening means that is connected to an installation portion on the vehicle body side through a mounting hole that penetrates in the plate thickness direction. And
A rupture scheduled portion that is formed to be recessed at the rear edge of the mounting portion, breaks due to the relative displacement of the installation portion rearward at the time of a vehicle collision, and allows the fastening means to come out of the mounting hole;
The gist of the planned fracture portion is formed on the base side of the mounting portion connected to the duct main body portion rather than a line passing in the front-rear direction through the center of the mounting hole, the entire circumference of which is surrounded by the mounting portion.
According to the first aspect of the present invention, since the fastening means is connected to the installation portion through the attachment hole surrounded by the attachment portion on the entire circumference, the center of the fastening means is prevented from being displaced, and the vehicle intake duct is accurately controlled. Can be installed well. Further, when the fastening means is passed through the collar fitted into the mounting hole, the holding force to the collar fitted into the mounting hole is increased, so that the collar can be prevented from dropping before the vehicle intake duct is installed in the vehicle. . And, when the installation part is relatively displaced rearward at the time of a vehicle collision, by forming the planned fracture part on the root side connected to the duct body part rather than the line passing through the center of the attachment hole in the front-rear direction at the rear edge of the attachment part The stress can be concentrated on the planned fracture portion. As a result, the opening edge on the rear side of the attachment hole can be appropriately broken from the planned breakage portion in the attachment portion, and the smooth withdrawal of the fastening means from the attachment hole is allowed. Therefore, the rearward displacement of the vehicle intake duct can be prevented at the time of a vehicle collision, and interference with components installed on the rear side of the vehicle intake duct can be avoided.

The gist of the invention according to claim 2 is that the planned fracture portion is formed on a line connecting the rear end of the base of the mounting portion from the center of the mounting hole or at a position close to the line.
According to the invention of claim 2, when the installation portion is relatively displaced rearward at the time of a vehicle collision, a stress acts from the attachment hole toward the rear end of the base of the attachment portion. By forming the planned fracture portion on the line connecting the rear ends of the roots or in the vicinity of the line, the stress can be more efficiently concentrated on the planned fracture portion. Thereby, the opening edge on the rear side of the attachment hole can be more appropriately broken starting from the planned breakage portion, and a smoother withdrawal of the fastening means from the attachment hole is allowed.

In the invention which concerns on Claim 3, the said fracture | rupture planned part is comprised by two sides connected so that a convex angle may be made in the rear edge of the said attachment part, The edge | side which continues to the base side of an attachment part among these two sides Is formed so as to extend linearly.
According to the invention according to claim 3, since the planned fracture portion is recessed so as to form a convex angle, when the installation portion is relatively displaced rearward at the time of a vehicle collision, the stress is more efficiently concentrated on the planned fracture portion. be able to. Thereby, the opening edge on the rear side of the attachment hole can be more appropriately broken starting from the planned breakage portion, and a smoother withdrawal of the fastening means from the attachment hole is allowed.

In the invention according to claim 4, the width of the mounting portion between the mounting hole and the planned fracture portion is the smallest among the opening edges that define the rear side of the mounting hole, or among the opening edges. The gist is that it is formed so as to be the same as the smallest part.
According to the invention of claim 4, the vehicle is configured so that the breakable portion is formed relatively weakly at the rear opening edge of the mounting hole in the mounting portion and stress is concentrated on the planned breakage portion. When the installation portion is relatively displaced rearward at the time of a collision, the rear opening edge of the mounting hole can be broken more smoothly at the planned breaking portion.

The invention according to claim 5 is characterized in that the mounting portion is formed such that a rear end of a base connected to the duct main body portion is located on the rear side of a rear edge surrounding the rear side of the mounting hole. And
According to the invention which concerns on Claim 5, since the front-back width | variety of the base of the attaching part connected to a duct main-body part can be enlarged, the intensity | strength of the base of an attaching part can be improved.

  According to the vehicle intake duct according to the present invention, the vehicle intake duct can be firmly and accurately attached to the vehicle body, and the relative rearward displacement of the installation portion on the vehicle body side can be allowed smoothly during a vehicle collision.

1 is a perspective view schematically showing a vehicle intake duct according to a preferred embodiment of the present invention. (a) is a top view which shows schematically the vehicle intake duct of an Example, (b) is a top view which shows the principal part of a vehicle intake duct. It is the sectional view on the AA line of Fig.2 (a). It is a bottom view which shows roughly the principal part of the vehicle intake duct of an Example. It is explanatory drawing which shows the state which the fracture | rupture planned part fractured | ruptured in the vehicle intake duct of an Example.

  Next, a preferred embodiment of the vehicle intake duct according to the present invention will be described below with reference to the accompanying drawings. In the following description, front, rear, left, right, upper, and lower sides of the vehicle intake duct are designated with reference to the state of attachment to the vehicle.

  As shown in FIG. 1, the vehicle intake duct 20 according to the embodiment includes a duct main body portion 22 that defines an air flow passage 22 a that connects an intake port 24 formed at one end to a delivery port 26 formed at the other end. It is configured as a subject. The vehicle intake duct 20 is connected to an installation portion 11 provided on an upper portion of the radiator support 10 for fixing a radiator installed on the front side of the engine room, and an intake port 24 of the duct main body portion 22 via an attachment portion 28 described later. The inlet 24 is installed on the upper side of the radiator support 10 (see FIG. 2). In addition, the vehicle intake duct 20 is connected to an air cleaner (intake device) 14 having a delivery port 26 connected to an engine installed in the engine room, and external air taken in from an intake port 24 disposed on the front side of the vehicle body, It sends out from the delivery port 26 to the air cleaner 14 which is the engine side. The duct main body 22 is arranged such that the intake port 24 opens forward. Further, the duct main body portion 22 is formed so as to bend downward from the intake port 24 and then bend to the left, and a delivery port 26 that opens to the left is located behind the intake port 24. Further, the duct body portion 22 has a flat shape in which the intake port 24 is elongated in the left-right direction, and has a shape in which the opening lower edge and the opening side edge lower portion protrude forward from the opening upper edge of the intake port 24. Yes. The vehicle intake duct 20 can be a resin molded product molded from polypropylene (PP) or the like by injection molding or blow molding, and is configured by assembling a plurality of parts even if the whole is integrally molded. Or any of them.

  As shown in FIG. 3, the vehicle intake duct 20 has a bolt (fastening means) 16 passed through a collar 18 fitted in a mounting hole 30 of a mounting portion 28 provided on the intake port 24 side of the duct main body portion 22. It is attached to the vehicle body by being fastened to the nut 12 with the installation portion 11 on the side sandwiched, and the attachment portion 28 being fixed by the bolt 16. The vehicle intake duct 20 includes a pair of attachment portions 28, 28 that extend in opposite directions in the left-right direction across the intake port 24 at the front portion of the duct body portion 22, and in the embodiment, the pair of attachment portions 28. , 28 are formed in a symmetrical shape (see FIG. 2A). The attachment portion 28 is a plate-like portion that extends from the lower side of the side surface of the duct body portion 22 in the left-right direction and whose vertical direction is the plate thickness direction, and is formed so that the circular attachment hole 30 penetrates in the plate thickness direction. ing. The mounting portion 28 surrounds the entire front, rear, left, and right circumferences of the mounting hole 30 provided on the inner side (see FIG. 2), and the mounting hole 30 does not have a notch shape in which a part thereof opens to the outer edge of the mounting portion 28. .

  As shown in FIG. 2, the attachment portion 28 is inclined to the rear side as the front edge connected to the lower opening edge of the intake port 24 moves away from the duct body portion 22, and the side edge extending to the lateral side of the attachment hole 30 is It is curved in an arc shape with the attachment hole 30 as the center. A wall piece 28a that protrudes upward is formed at the front edge of the attachment portion 28. The wall piece 28a is connected to the side surface of the duct main body portion 22 and from the side surface of the duct main body portion 22 to the side of the attachment hole 30 (more Specifically, it extends over the center of the mounting hole 30 in a horizontal direction). Thus, the front edge of the attachment portion 28 is reinforced by the wall piece 28a.

  As shown in FIG. 2, the attachment portion 28 has a planned break portion 32 that breaks due to the relative displacement of the installation portion 11 rearward at the time of a vehicle collision and allows the bolt 16 and the collar 18 to come out of the attachment hole 30. , Formed at the trailing edge. The planned fracture portion 32 is a recess formed at the rear edge of the mounting portion 28, and is a duct body rather than a front / rear line (line) L 1 that passes through the center of the mounting hole 30 surrounded by the mounting portion 28 in the front-rear direction. The mounting portion 28 connected to the portion 22 is formed so as to be shifted toward the base side. The breakable portion 32 of the embodiment is formed in a V notch shape in which a rear edge extending rearward from the attachment hole 30 in the attachment portion 28 is cut out in a substantially triangular shape toward the front, and the bottom of the dent is formed. The corner is disposed on the base side of the attachment portion 28 with respect to the front-rear line L1. Moreover, the fracture | rupture planned part 32 is formed in the position (Example) on the inclination line (line) L2 which tied the rear end of the root of the attachment part 28 from the center of the attachment hole 30 or the said inclination line L2. Here, when the planned break portion 32 is shifted from the inclined line L2, it varies depending on the size of the mounting portion 28, etc., but is preferably set to 3 mm or less from the inclined line L2, and is attached more than the inclined line L2. It is better to set it at the base side of the part 28.

  As shown in FIG. 2 (b), the planned fracture portion 32 is composed of two sides that are connected so as to form a convex angle at the rear edge of the attachment portion 28, and the base side of the attachment portion 28 among the two sides. The sides (referred to as root sides) that extend in a straight line extend. The base side of the attachment portion 28 extends so as to incline toward the base side from the front to the back, and is approximately along the inclined line L2 along the inclined line L2 or so that the angle formed with the inclined line L2 is smaller than an acute angle. It is set together. Further, of the two sides constituting the planned fracture portion 32, the side that continues to the rear side of the mounting hole 30 (referred to as an extended side) extends in a straight line that inclines toward the base side from the rear toward the front. . A portion of the rear edge of the attachment portion 28 that extends to the rear side of the attachment hole 30 along the extended side is formed in an arc shape centered on the attachment hole 30. Here, the attachment portion 28 is formed so that the rear end of the base connected to the duct main body portion 22 is located on the rear side of the rear edge of the attachment portion 28 and extending to the rear side of the attachment hole 30. In the mounting portion 28, the base front-rear width is larger than the front-rear width on the front-rear line L1.

  In the mounting portion 28, the width of the rear opening edge that defines the rear side of the mounting hole 30 is the smallest between the mounting hole 30 and the planned fracture portion 32. The width of the opening edge that defines the attachment hole 30 refers to the shortest distance from the edge of the attachment hole 30 to the edge of the attachment portion 28. The mounting portion 28 has a substantially constant opening edge width from the side edge extending in a circular arc shape around the mounting hole 30 to the rear edge. The opening edge width along the radial direction of the mounting hole 30 is smaller than the portion through which the front and rear line L1 passes. As described above, the attachment portion 28 is the planned fracture portion 32 that is shifted to the base side from the front-rear line L1, and the rear opening edge that surrounds the rear side of the attachment hole 30 is set to be the most fragile.

  As shown in FIG. 4, a concave portion 34 that is recessed in the thickness direction is formed on the back surface of the attachment portion 28. The mounting portion 28 is basically formed with a concave portion 34 leaving the periphery of the mounting portion 28 and the periphery of the mounting hole 30, and the edge of the mounting portion 28 and the edge of the mounting hole 30 are compared with the formation site of the concave portion 34. The thick plate portion 36 is thick. In the embodiment, a line from the duct body portion 22 to the side edge of the mounting hole 30 passes through the center of the mounting hole 30 in the left-right direction, and a mounting portion extends from the side edge of the mounting hole 30 through the center of the mounting hole 30 in the left-right direction. The line from the front edge of the attachment hole 30 to the front edge of the attachment part 28 is not provided in the line to the side edge of 28 and the center of the attachment hole 30 in the front-rear direction. The thick plate portion 36 is thicker than the forming portion. As described above, the vehicle intake duct 20 is provided with the concave portion 34 on the back surface of the attachment portion 28, thereby preventing deformation such as sink marks on the upper surface of the attachment portion 28 that appears on the front side when installed on the vehicle body.

  As shown in FIG. 3, the vehicle intake duct 20 passes a bolt 16 as a fastening means to a nut 12 provided in the installation portion 11 of the radiator support 10 through the inside of a cylindrical collar 18 fitted in the mounting hole 30. The mounting portion 28 is fixed to the vehicle body by screwing. In the embodiment, the nut 12 is fixed in advance to the installation portion 11 of the radiator support 10 by welding. The outer diameter of the collar 18 is set to be slightly larger than the diameter of the mounting hole 30, and the height (length) is set to be slightly larger than the plate thickness of the mounting portion 28 (thickness of the thick plate portion 36). Yes. The vehicle intake duct 20 is restricted from moving in the front-rear and left-right directions by the collar 18 that is sandwiched and fixed between the upper surface of the installation portion 11 and the head of the bolt 16. Further, the vehicle intake duct 20 is configured such that when the bolt 16 is fastened, the head of the bolt 16 is brought into contact with the collar 18 so as not to contact the upper surface of the mounting portion 28. No surface pressure is applied in the thickness direction.

(Effects of Example)
Next, the operation of the vehicle intake duct 20 according to the embodiment will be described. When the vehicle collides, the radiator and the radiator support 10 installed on the front side of the vehicle body are displaced rearward. At this time, the bolt 16 connected to the nut 12 of the installation part 11 of the radiator support 10 also tries to be displaced backward. When a force is applied from the collar 18 through the bolt 16 to the rear opening edge of the attachment hole 30 in the attachment portion 28, the rear opening edge of the attachment portion 28 extends behind the attachment hole 30 starting from the planned fracture portion 32. Breaking to open, rearward displacement of the bolt 16 and collar 18 is allowed (see FIG. 5). Here, the vehicle intake duct 20 forms a planned fracture portion 32 by shifting to the root side connected to the duct main body portion 22 from the front / rear line L1 passing through the center of the mounting hole 30 in the front / rear direction at the rear edge of the mounting portion 28. Therefore, the stress applied toward the base side of the attachment portion 28, not directly behind the attachment hole 30, can be concentrated on the planned fracture portion 32. Thereby, when the installation portion 11 is relatively displaced rearward at the time of a vehicle collision, the rear opening edge of the attachment hole 30 can be broken more appropriately and smoothly from the planned break portion 32 in the attachment portion 28. Smooth removal of the bolt 16 and the collar 18 from the hole 30 is allowed. Since the vehicle intake duct 20 is connected to the air cleaner 14 at the outlet 26, the bolt 16 and the collar 18 come out from the mounting hole 30, so that the vehicle intake duct 20 stays at the position where it is mounted without following the rearward displacement of the installation portion 11. . Therefore, rearward displacement of the vehicle intake duct 20 can be prevented at the time of a vehicle collision, and interference with components such as a radiator water injection section installed on the rear side of the vehicle intake duct 20 can be avoided. Further, it is possible to avoid a situation where the duct main body 22 itself of the vehicle intake duct 20 is damaged and cannot be restarted at the time of a vehicle collision.

  When the installation portion 11 is relatively displaced rearward at the time of a vehicle collision, a stress acts from the mounting hole 30 toward the rear end of the base of the mounting portion 28, so that the rear end of the base of the mounting portion 28 from the center of the mounting hole 30. By forming the planned fracture portion 32 at a position close to the inclined line L2 connecting the stresses, stress can be more efficiently concentrated on the planned fracture portion 32, and the rear opening edge of the mounting hole 30 can be broken more smoothly. Can be made. Further, since the planned fracture portion 32 is recessed so as to form a V-notch convex angle, the stress can be more efficiently concentrated in a narrow range when the installation portion 11 is relatively displaced rearward during a vehicle collision. The rear opening edge of the mounting hole 30 can be broken more smoothly. In the attachment portion 28, the width between the attachment hole 30 and the planned fracture portion 32 is set to the minimum among the opening edges that define the rear side of the attachment hole 30. Thereby, the formation position of the planned fracture portion 32 is relatively weakly formed at the rear opening edge of the mounting hole 30 in the mounting portion 28 and the stress is concentrated on the planned fracture portion 32. When the installation part 11 is relatively displaced rearward at the time of a collision, the rear opening edge of the mounting hole 30 can be broken more smoothly with the planned breaking part 32 as a starting point.

  Since the vehicle intake duct 20 has a configuration in which the collar 18 is fitted into the mounting hole 30 that is surrounded by the mounting portion 28, the mounting hole 30 can be prevented from being deformed by fitting the collar 18. The misalignment of the collar 18 fitted in 30 and the bolt 16 passing through the collar 18 can be avoided. Since the vehicle intake duct 20 is configured to connect the bolt 16 that passes through the inside of the collar 18 fitted in the mounting hole 30 to the nut 12 of the installation portion 11, the displacement of the installation position with respect to the installation portion 11 is prevented. And can be attached to the vehicle body with high accuracy. Further, since the entire circumference of the collar 18 passed through the mounting hole 30 is held by the opening edge of the mounting portion 28 surrounding the mounting hole 30, the holding force (pull-out load) of the collar 18 is improved, and the collar 18 is attached to the mounting portion 28. Can be attached firmly. Thus, since the holding power of the collar 18 fitted in the mounting hole 30 is high, it is not necessary to use the collar 18 having a special shape in order to improve the pull-out load, and a general collar 18 can be used. The cost for installation can be reduced. Further, since the holding force to the collar 18 fitted in the mounting hole 30 is increased, it is possible to prevent the collar 18 from dropping before the vehicle intake duct 20 is installed in the vehicle. The vehicle intake duct 20 has a configuration in which the attachment portion 28 is broken at the planned breakage portion 32 at the time of a vehicle collision and allows the bolt 16 and the collar 18 to be pulled out from the attachment hole 30. Even if 32 is provided, it can attach to a vehicle body accurately and firmly. In addition, the attachment portion 28 is formed so that the rear end of the base connected to the duct main body portion 22 is located on the rear side of the rear edge surrounding the rear side of the attachment hole 30. The front-rear width can be increased, and the strength of the base of the attachment portion 28 can be improved.

(Example of change)
For example, the present invention can be modified as follows.
(1) In the embodiment, the width between the mounting hole and the planned fracture portion is set to be the smallest of the rear opening edges of the mounting hole. You may form so that the width | variety between may become the same as the minimum site | part of the rear side opening edge of a mounting hole. Even in this case, since the stress acting toward the base side of the attachment portion is concentrated on the planned fracture portion, the rear opening edge of the attachment hole can be fractured starting from the planned fracture portion.
(2) Although the shape of the embodiment is suitable for the shape of the dent forming the planned fracture portion, it may be a slit shape or other shapes.
(3) The fastening means is not limited to the configuration of the embodiment, and other means that can fix the attachment portion to the installation portion, such as using a stepped bolt as a bolt or a rivet, can be adopted.
(4) In the embodiment, the concave portion is provided on the back surface of the attachment portion. However, the concave portion may be provided in a straight line that is the shortest distance from the planned fracture portion to the edge of the attachment hole. By setting it as such a structure, an attaching part can be made easier to fracture | rupture at the time of a vehicle collision.

11 installation part, 16 bolt (fastening means), 22 duct body part, 22a air flow passage,
24 intake port, 26 delivery port, 28 mounting part, 30 mounting hole, 32 planned fracture part,
L1 front and rear line (line passing through the center of the mounting hole in the front and rear direction),
L2 inclined line (line connecting the rear end of the base of the mounting part from the center of the mounting hole)

Claims (5)

A cylindrical duct main body that defines an air flow passage that leads from an intake port disposed on the front side of the vehicle body to a delivery port connected to the engine side mounted on the vehicle body on the rear side of the intake port;
Mounting that is formed in a plate shape extending from the duct body on the intake side of the duct body, and is fixed by a fastening means that is connected to an installation portion on the vehicle body side through a mounting hole that penetrates in the plate thickness direction. And
A rupture scheduled portion that is formed to be recessed at the rear edge of the mounting portion, breaks due to the relative displacement of the installation portion rearward at the time of a vehicle collision, and allows the fastening means to come out of the mounting hole;
The vehicle is characterized in that the planned fracture portion is formed on the base side of the attachment portion connected to the duct main body portion rather than a line passing in the front-rear direction through the center of the attachment hole, the entire circumference of which is surrounded by the attachment portion. Intake duct.   The vehicle intake duct according to claim 1, wherein the planned fracture portion is formed on a line connecting a rear end of a base of the mounting portion from a center of the mounting hole or a position close to the line.   The planned fracture portion is composed of two sides that are continuous so as to form a convex angle at the rear edge of the mounting portion, and the side that is continuous to the base side of the mounting portion among the two sides extends linearly. The vehicle air intake duct according to claim 1 or 2, wherein the vehicle air intake duct is formed.   The mounting portion has a width between the mounting hole and the planned fracture portion that is the smallest of the opening edges that define the rear side of the mounting hole or the same as the smallest portion of the opening edges. The vehicle intake duct according to any one of claims 1 to 3, wherein the vehicle intake duct is formed on the vehicle.   5. The attachment portion according to claim 1, wherein a rear end of a base connected to the duct main body portion is formed on a rear side of a rear edge surrounding a rear side of the attachment hole. Vehicle intake duct as described.

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