JP6579133B2 - Engine intake structure - Google Patents

Description

  The present invention relates to an intake structure of an engine, and more particularly to a structure around a new air intake port of an intake duct.

  Patent Document 1 describes an intake structure in which a fresh air intake port of an intake duct of an engine is opened forward from between a hood of an automobile and a shroud of a radiator. In this document, in front of the fresh air intake, the inner panel of the bonnet is bulged downward, and the bulging portion prevents water from entering the fresh air intake.

Japanese Utility Model Publication No. 05-12233

  However, in the intake structure of the above document, since the bonnet inner panel is located in front of the fresh air intake, the bonnet vibrates due to the intake pulsation, and the vibration is transmitted from the bonnet to the dash panel and further to the automobile floor. There is a problem. For example, in a four-cylinder engine, when the frequency of the intake pulsation is low and the pressure wave due to the intake pulsation becomes strong, such as when the reduced cylinder operation (two-cylinder operation) is performed, the vibration and the noise accompanying the vibration are particularly remarkable. Become. Although it is possible to provide a damping material or the like on the bonnet to take measures against the above problem, there is a concern about an increase in cost and weight of the vehicle body.

  Therefore, an object of the present invention is to suppress bonnet vibration due to intake pulsation while suppressing an increase in cost and weight of the vehicle body.

  In order to solve the above-described problems, the present invention is configured to block the pressure wave coming out from the fresh air intake port by the intake pulsation by the bumper bracket.

In the intake structure of the engine disclosed herein, the fresh air intake of the intake duct opens forward from between the hood of the automobile and the shroud of the radiator,
It is fastened to the upper surface of the shroud, and includes a plate-like bumper bracket that extends forward from the shroud and supports the upper portion of the bumper from the back surface side,
The bumper bracket includes a rising portion that rises from the upper surface side of the shroud at a portion corresponding to the fresh air intake, an opening is formed in the rising portion, and the fresh air intake is connected to the opening. And
A portion of the bumper bracket that extends forward from the upper portion of the rising portion toward the bumper shields the bonnet from the fresh air inlet.

  According to this, since the opening is formed in the rising part of the bumper bracket that rises from the upper surface of the shroud, and the fresh air intake port is connected to the opening, the part that extends forward from the upper part of the rising part of the bumper bracket is The bonnet will be shielded from the fresh air intake. Therefore, the pressure wave coming out from the fresh air intake due to the intake pulsation is blocked by the bumper bracket, so that the bonnet is prevented from vibrating due to the intake pulsation. On the other hand, the bumper vibrates due to the intake pulsation, but unlike the bonnet, the bumper is not coupled to the dash panel that forms the passenger compartment, so the bumper vibration is hardly transmitted to the dash panel or the passenger compartment floor. . Therefore, it is possible to avoid discomfort to the occupant due to the intake pulse rate.

  In a preferred embodiment, the bumper bracket includes a vertical wall that protrudes downward in a portion extending forward from the upper portion of the rising portion so as to shield the fresh air intake in front of the fresh air intake. ing.

  According to this, rainwater and snow that flows from the front grill of the automobile toward the fresh air intake during the driving of the automobile hits the vertical wall of the bumper bracket and can enter the intake duct directly from the fresh air intake. It is suppressed.

In a preferred embodiment, the shroud includes a lateral wall extending forward from an upper portion of the rising portion of the bumper bracket, a lateral wall facing up and down, a longitudinal wall facing the longitudinal wall and the longitudinal wall of the bumper bracket, and
An inverted L-shaped fresh air introduction path having an open lower end communicating with the fresh air inlet is formed by the opposed lateral wall and the opposed vertical wall of the bumper bracket and the shroud.

  According to this, since the entrance of the fresh air introduction path opens downward, rainwater and snow are less likely to enter. Further, even if rainwater or snow is blown up and enters the fresh air introduction path, they hit the lateral wall of the bumper bracket, so that intrusion into the intake duct is suppressed.

In a preferred embodiment, a seal line that seals the engine room of the automobile by a seal member provided on the bonnet extends in a vehicle width direction on a flat upper surface of the intake duct,
The both sides of the upper surface of the intake duct are provided with inclined portions that are inclined downward toward both outer sides through which the seal line passes.

  As described above, the fact that the fresh air inlet of the intake duct opens forward from between the hood and the shroud means that the intake duct rests on the shroud. In this case, when the seal line by the seal member of the bonnet passes over the intake duct, the portion of the seal line passing through the upper surface of the intake duct becomes higher than both sides. Therefore, in this embodiment, by providing inclined portions on both side portions of the upper surface of the intake duct, a portion where the height changes suddenly is not generated in the seal line. Therefore, it becomes easy to ensure the desired sealing performance even in this case.

  In a preferred embodiment, the bumper bracket includes an inclined support portion that supports an inclined portion of the intake duct at a connection portion connected to the new intake port.

  Thereby, the support rigidity of the inclined portion of the intake duct is increased, which is advantageous for ensuring the sealing performance.

In a preferred embodiment, the portion of the bumper bracket corresponding to the intake duct is a raised portion that is raised so that a recess for introducing fresh air into the fresh air inlet is formed on the lower surface side,
The bonnet has an inner panel for reinforcement inside,
The inner panel includes a structural bead that protrudes downward from the front of the bonnet and extends in the vehicle width direction.
The structural bead has a downward projecting amount that is smaller than both sides of the bumper bracket so as not to interfere with the floating portion at the portion corresponding to the floating portion, or the protruding amount is zero. It has become.

  According to this, since the part corresponding to the intake duct of the bumper bracket is a floating part, even when the position of the fresh air intake of the intake duct is high, fresh air is renewed through the recess on the lower surface side of the floating part. It can be introduced into the air intake. Then, since the inner panel has a structural bead, and the downward projecting amount of the portion corresponding to the floating portion of the structural bead is smaller than the both sides or zero, the intake duct The rigidity of the front part of the bonnet can be increased while avoiding interference with the hood.

  According to the present invention, the opening is formed in the rising portion of the bumper bracket rising from the upper surface of the shroud, the fresh air inlet is connected to the opening, and the portion extending forward from the upper portion of the rising portion of the bumper bracket toward the bumper However, since the bonnet is shielded from the fresh air intake, the vibration of the bonnet due to the intake pulsation can be suppressed while suppressing the increase in cost and the weight of the vehicle body, thus suppressing the vibration of the dash panel and the passenger compartment floor. can do.

The perspective view which shows a part of front part of a motor vehicle. FIG. FIG. 3 is a cross-sectional view in which a part of the line AA in FIG. 2 is omitted. The perspective view which shows a shroud and an air intake duct. The perspective view which shows a shroud, an intake duct, and a bumper bracket. The perspective view which looked at a part of intake duct from the bottom. The perspective view which looked at the state where the air intake duct was connected to the bumper bracket from the lower part. FIG. 3 is an enlarged cross-sectional view of FIG. 2 along line CC. Sectional drawing which expanded a part of FIG. FIG. 10 is a cross-sectional view similar to FIG. 9 taken along line BB in FIG. 2.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its application, or its use.

<Front structure of automobile according to embodiment>
In the front structure of the automobile shown in FIGS. 1 and 2, 1 is a bumper, 2 is a front grill provided in the center of the bumper 1, 3 is a radiator shroud, 4 is an air cleaner for the engine provided in the engine room, Reference numeral 5 denotes an intake duct connected to the air cleaner 4 for taking in fresh air. The intake duct 5 is disposed closer to one side than the center in the width direction of the automobile. A rear end portion of a plate-like bumper bracket 6 is fastened to the upper surface of the shroud 3. The bumper bracket 6 extends forward from the shroud 3 toward the upper rear surface (lower surface) of the bumper 1 and supports the upper portion of the bumper 1 from the rear surface side.

  As shown in FIG. 3, the front portion of the intake duct 5 rests on the upper surface of the shroud 3, and the front-end fresh air inlet 7 opens forward from between the shroud 3 and the hood 8. In FIG. 3, 9 is a radiator supported by the shroud 3, and 10 is a grill shutter supported by the shroud 3 on the front side of the radiator 9.

  As shown in FIG. 4, the shroud 3 is formed by fixing a metal shroud upper (panel) 12 on the upper surface of a resin shroud main body 11 that supports a radiator 9. As shown in FIGS. 1 and 2, the intake duct 5 is placed on the shroud main body 11 and fixed by a screw member 13, and the front end portion is placed on the shroud upper 12.

  As shown in FIG. 5, the rear end of the bumper bracket 6 is placed on the shroud upper 12. As shown in FIG. 1 and the like, the bumper bracket 6 is fastened to the shroud 3 by a screw member 14. The bumper bracket 6 is provided with a raised portion 15 that floats at a portion corresponding to the intake duct 5 so that the lower surface side becomes a recess for introducing fresh air into the fresh air inlet 7, and the upper surface is flat. The intake duct 5 is connected to the floating portion 15.

  Hereinafter, the structure of the connecting portion will be specifically described.

  As shown in FIG. 6, the intake duct 5 includes a flange 16 protruding from the peripheral edge of the fresh air inlet 7. The flange 16 has a trapezoidal shape, and a trapezoidal overhanging portion 17 that is supported by covering the rear end portion of the floating portion 15 of the bumper bracket 6 projects from the upper edge and both side edges. Mounting portions 18 to which the screw members 13 are applied are provided on both sides of the rear portion of the intake duct 5. In addition, inclined walls 19 extending in the front-rear direction are provided on both sides of the intake duct 5 so as to connect the flange 16 and the mounting portion 18. The inclined walls 19 on both sides constitute an inclined portion 21 inclined downward from the flat upper surface 20 of the intake duct 5 shown in FIG.

  As shown in FIG. 7, the bumper bracket 6 has a rising portion 22 rising from the upper surface side of the shroud 3 at a rear end portion of the floating portion 15, that is, a portion corresponding to the fresh air inlet 7 of the intake duct 5. I have. An opening 23 is formed in the rising portion 22, and the fresh air inlet 7 of the intake duct 5 is connected to the opening 23.

  The floating portion 15 includes inclined walls 25 inclined downward toward both outer sides on both sides of a ceiling wall 24 that forms a flat upper surface. Then, as shown in FIG. 8 and the like, the trapezoidal overhanging portion 17 projecting forward from around the fresh air inlet 7 of the intake duct 5 is the ceiling wall 24 and the inclined wall of the rising portion 15 of the bumper bracket 6. 25 and is supported.

  Further, the bumper bracket 6 includes a vertical wall 26 extending in the vehicle width direction protruding downward at a portion extending forward from the upper portion of the rising portion 22, specifically, a portion extending further forward than the floating portion 15. ing. The vertical wall 26 shields the fresh air intake 7 from the front thereof at a position spaced forward from the fresh air intake 7 of the intake duct 5. The bumper bracket 6 includes side ribs (side walls) 27 that protrude downward from both sides of the opening 23 of the rising portion 22 and extend forward from the boundary between the ceiling wall 24 and the inclined wall 25 of the floating portion 15.

  Accordingly, as shown in FIG. 9, the connection of the fresh air intake 7 of the intake duct 5 to the opening 22 of the bumper bracket 6 causes a fresh air introduction path 31 leading to the fresh air intake 7 to be formed by the bumper bracket 6 and the shroud upper 12. Is formed. A portion extending forward from the upper portion of the rising portion 22 of the bumper bracket 6, that is, a portion extending forward from the floating portion 15 and the hood 8 is shielded from the fresh air inlet 7 of the intake duct 5. It has a structure to do.

  Here, the shroud upper 12 includes a horizontal horizontal wall 12a extending forward from a portion fixed to the shroud main body 11, and a vertical wall 12b extending downward from the tip of the horizontal wall 12a. The horizontal wall 12a is vertically opposed to the ceiling wall (lateral wall) 24 of the floating portion 15 of the bumper bracket 6, and the vertical wall 12b is opposed to the vertical wall 26 of the bumper bracket 6 in the front-rear direction. That is, the fresh air introduction path 31 is formed in an inverted L shape with the lower end opened by the opposed horizontal walls 24, 12a and the opposed vertical walls 26, 12b of the bumper bracket 6 and the shroud upper 12. The lower end thereof, that is, the inlet 30 of the fresh air introduction path 31 opens downward at a position higher than the upper end of the grill shutter 10.

  As shown in FIG. 10, the bonnet 8 includes a reinforcing inner panel 33 on the inner side, that is, the lower surface. At the front portion of the inner panel 33, a structural bead 34 is formed that protrudes downward at a position corresponding to the raised portion 15 of the bumper bracket 6 in the vehicle width direction. As shown in FIG. 9, the structural bead 34 has a substantially zero protruding amount at a portion corresponding to the raised portion 15 of the bumper bracket 6 so as not to interfere with the raised portion 15.

  Further, a first seal member 35 is fixed to the periphery of the inner panel 33 of the bonnet 8 so as to contact the upper rear end of the bumper 1 and seal the engine room when the bonnet 8 is closed. Further, a second seal member 36 extending in the vehicle width direction is also fixed to the inner panel 33 on the rear side adjacent to the structural bead 34 and also for sealing the engine room. The vehicle body side seal line L with which the second seal member 36 abuts when the hood 8 is closed extends in the vehicle width direction through the flat upper surface 20 of the intake duct 5 as shown by a two-dot chain line in FIG. ing. Since the intake duct 5 has inclined portions 21 on both sides of the flat upper surface 20, the seal line L extends so as to pass through the upper surface 20 and the inclined portion 21.

  That is, when the bonnet 8 is closed, the second seal member 36 contacts the upper surface 20 and the inclined portion 21 of the intake duct 5, the bumper bracket 6, and the shroud upper 12.

<Advantages of Embodiment>
The raised portion 15 of the bumper bracket 6 and the portion extending forward from the raised portion 15 shield the bonnet 8 from the fresh air intake 7 of the intake duct 5. Therefore, the bonnet 8 is suppressed from vibrating due to the intake pulsation, and as a result, the vibration of the dash panel and the passenger compartment floor is suppressed.

  Since the vertical wall 26 provided on the bumper bracket 6 shields the fresh air intake 7 in front of the fresh air intake 7 of the intake duct 5, rain water and snow are generated from the front grill and the like while the vehicle is running. Even if it blows in, the rainwater and snow hit the vertical wall 26. Therefore, rainwater and snow can be prevented from entering the intake duct 5 directly from the fresh air intake 7.

  In the case of the embodiment, fresh air (outside air) is guided to the intake duct 5 by the fresh air introduction path 31 formed by the bumper bracket 6 and the shroud upper 12. Even if rainwater or snow is blown up and enters from the entrance of the fresh air introduction path 31, they hit the ceiling wall (lateral wall) 24 of the rising portion 15 of the bumper bracket 6. Therefore, intrusion of rainwater or snow into the intake duct 5 is suppressed. Further, since the inlet 30 of the fresh air introduction path 31 is located higher than the upper end of the grill shutter 10, it is advantageous in preventing water from entering the intake duct 5 when traveling on a submerged channel.

  The seal line by the seal member 36 of the bonnet 8 passes over the intake duct 5, but both sides of the upper surface 20 of the intake duct 5 are inclined portions 21, which is advantageous for securing the sealing performance by the seal member 36. Become. Further, the trapezoidal overhanging portion 17 of the intake duct 5 is supported by being covered with the ceiling wall 24 and the inclined wall 25 of the rising portion 15 of the bumper bracket 6. This means that the ceiling wall and the inclined wall 19 forming the upper surface 20 of the intake duct 5 are supported by the ceiling wall 24 and the inclined wall 25 of the raised portion 15 of the bumper bracket 6 via the trapezoidal overhanging portion 17. Means. That is, the inclined wall 25 of the floating portion 15 constitutes an inclined support portion that supports the inclined portion 21 of the intake duct 5. Accordingly, the support rigidity of the ceiling wall and the inclined wall 19 of the intake duct 5 is increased, which is advantageous for ensuring the sealing property. Moreover, since the bumper bracket 6 includes the side ribs 27 that protrude downward from the boundary between the ceiling wall 24 and the inclined wall 25, the side ribs 27 further increase the support rigidity.

  The inner panel 33 of the bonnet 8 has a structural bead 34, and the downward projecting amount of the portion corresponding to the raised portion 15 of the structural bead 24 is substantially zero, so that interference with the intake duct is avoided. The rigidity of the front part of the bonnet 8 can be increased.

DESCRIPTION OF SYMBOLS 1 Bumper 3 Shroud 5 Intake duct 6 Bumper bracket 7 Fresh air inlet 8 Bonnet 9 Radiator 10 Grill shutter 11 Shroud main body 12 Shroud upper 12a Horizontal wall 12b Vertical wall 15 Lifting part 19 Inclined wall of intake duct 5 20 Upper surface of intake duct 5 21 Inclined portion of intake duct 5 22 Rising portion 23 Opening 24 Ceiling wall (horizontal wall) of floating portion 15
25 Inclined wall of the floating part 15 (inclined support part)
26 Vertical Wall of Bumper Bracket 30 30 Inlet of Fresh Air Introduction Path 31 31 Fresh Air Introduction Path 33 Inner Panel 34 Structure Bead 36 Seal Member L Seal Line

Claims (6)

An intake structure for an engine in which a fresh air intake port of an intake duct opens forward from between a vehicle hood and a radiator shroud,
It is fastened to the upper surface of the shroud, and includes a plate-like bumper bracket that extends forward from the shroud and supports the upper portion of the bumper from the back surface side,
The bumper bracket includes a rising portion that rises from the upper surface side of the shroud at a portion corresponding to the fresh air intake, an opening is formed in the rising portion, and the fresh air intake is connected to the opening. And
An intake structure for an engine, wherein a portion of the bumper bracket that extends forward from an upper portion of the rising portion toward the bumper shields the bonnet from the fresh air intake. In claim 1,
The bumper bracket is provided with a vertical wall projecting downward so as to shield the fresh air intake at a front portion separated from the fresh air intake at a portion extending forward from an upper portion of the rising portion. The intake structure of the engine. In claim 2,
It said shroud comprises from the top of the rising portion of the upper Symbol bumper bracket and transverse walls extending forwardly and vertically on opposite lateral walls, and opposed vertical walls in the longitudinal and the vertical wall of the bumper bracket,
An engine in which an inverted L-shaped fresh air introduction opening having a lower end communicating with the fresh air inlet is formed by the opposed lateral wall and the opposed vertical wall of the bumper bracket and the shroud. Intake structure. In any one of Claim 1 thru | or 3,
A seal line for sealing the engine room of the automobile by a seal member provided on the bonnet extends in the vehicle width direction on the flat upper surface of the intake duct,
An intake structure for an engine, characterized in that inclined portions that are inclined downward toward both outer sides through which the seal line passes are provided on both side portions of the upper surface of the intake duct. In claim 4,
The bumper bracket, said fresh air intake connected to the connecting portion to the inlet, an intake structure of the engine, characterized in that it comprises a tilting support portion that supports the inclined portion of the intake duct. In any one of Claims 1 thru | or 5,
The portion of the bumper bracket connected to the intake duct is a raised portion that is raised so that a recess for introducing fresh air into the fresh air intake port is formed on the lower surface side.
The bonnet has an inner panel for reinforcement inside,
The inner panel includes a structural bead that protrudes downward from the front of the bonnet and extends in the vehicle width direction.
The structural bead has a downward projecting amount that is smaller than both sides of the bumper bracket so as not to interfere with the floating portion at the portion corresponding to the floating portion, or the protruding amount is zero. The intake structure of the engine, characterized by

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