JP2007185993A - Vehicle front grill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular front grill capable of appropriately reduces noise generated by a direct-injection engine over a wide band. <P>SOLUTION: This vehicular front grill is dually structured including first and second grills comprising a plurality of bar-like members. Specifically, the first grill is located toward the outside of a vehicle relative to the second grille, and the second grill is located toward an engine compartment relative to the first grill. Thus, noise in the engine compartment is effectively suppressed from being directly emitted toward the outside of the vehicle. Moreover, noise emitted from the engine compartment can be made to enter in the first and second grills at a plurality of times. Accordingly, the front grill can appropriately reduce noise over the wide band range. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a front grill of a vehicle.

  2. Description of the Related Art Conventionally, a front grill (radiator grill) has been provided on the front side of a vehicle engine room in order to reduce the sound in the engine room (engine sound or the like) while allowing outside air to pass through the engine room. For example, Patent Document 1 describes a front grille in which a radiator guard front opening is appropriately spaced in the vertical direction and a plurality of sound absorbing louvers are arranged in a substantially horizontal direction. Patent Document 2 describes a front grille in which a sound absorbing material is disposed on the upper surface of a grill flange provided in front of the engine room.

  Patent Document 3 describes a front grille in which a sound absorbing louver is attached to the inside of a side plate of a front grille frame. Patent Document 4 describes a sound-insulating front grille structure having two plate members in which a large number of through holes are formed in front of the engine room. Patent Document 5 describes a front grille having a bar-like member having an opening only on the engine room side, and a sound absorbing material provided so as to cover the opening of the bar-like member.

Japanese Utility Model Publication No. 62-49429 Japanese Patent Publication No. 63-18553 Japanese Utility Model Publication No. 64-6160 JP 2000-272439 A JP 2004-168137 A

  By the way, in a direct injection type engine or the like, sound having a frequency over a wide band is radiated. However, in the above-described front grilles described in Patent Documents 1 to 5, there is a case where the sound over a wide band generated from a direct injection engine or the like cannot be appropriately reduced.

  The present invention has been made to solve the above-described problems, and provides a vehicle front grill capable of appropriately reducing a wide-band sound generated from a direct injection type engine or the like. With the goal.

  In one aspect of the present invention, in a front grill of a vehicle provided on the front side of an engine room of a vehicle, a first grill having a plurality of first rod-like members arranged substantially parallel to each other, and the first grill A second grill having a plurality of second rod-like members disposed apart from the grill on the engine room side and arranged substantially parallel to each other and substantially parallel to the first rod-like member. It is characterized by that.

  The vehicle front grill is preferably used to reduce the noise in the engine room while allowing the outside air to pass through the engine room. A vehicle front grill (hereinafter also simply referred to as “front grill”) includes a first grill and a plurality of second rod members each having a plurality of first rod members arranged substantially in parallel with each other. And a second grill configured to be arranged substantially parallel to each other. That is, the front grill has a double structure including the first grill and the second grill. Specifically, the first grill is disposed outside the vehicle with respect to the second grill, and the second grill is disposed at a predetermined distance from the first grill toward the engine room. ing. Further, a sound absorbing material can be provided on the first grill and the second grill. Therefore, according to the above-described front grill of the vehicle, there is a high possibility that the sound radiated from the engine room is incident on the grill. Therefore, it is appropriately suppressed that the sound in the engine room is directly emitted to the outside of the vehicle. be able to. Furthermore, the sound radiated from the engine room can be incident on the first grill and the second grill a plurality of times. As described above, according to the above-described front grill of the vehicle, it is possible to appropriately reduce the sound over a wide band generated from the engine room while appropriately ensuring the ventilation of the outside air to the engine room.

  In one aspect of the vehicle front grill, the first rod-shaped member is provided with a sound absorbing material on an outer wall surface facing the engine room, and the second rod-shaped member is disposed on the first grill. A sound absorbing material is provided on the outer wall surface facing and the outer wall surface facing the engine room.

  In this aspect, the first rod-shaped member is provided with the sound absorbing material only on the outer wall surface facing the engine room, and the sound absorbing material is not provided on the outer wall surface facing the outside of the vehicle. That is, the first rod-like member is provided with a sound absorbing material on the back side (engine room side) of the design surface of the front grille. On the other hand, the second rod-shaped member is provided with a sound absorbing material on the outer wall surface facing the engine room and with a sound absorbing material on the outer wall surface facing the first grill. That is, the second rod-shaped member is substantially entirely covered with the sound absorbing material. Thus, by providing the sound absorbing material, it becomes difficult to directly see the sound absorbing material from the outside of the vehicle. Therefore, according to said front grille, the sound absorption performance with respect to the sound in an engine room can be improved, without affecting the external appearance (design) of a front grille.

  In another aspect of the front grill of the vehicle, the first grill and the second grill are arranged such that a space between the first grill and the second grill is outside the vehicle from the engine room. The plurality of rod-shaped members are arranged so as not to form a straight path to the end.

  In this aspect, the space between the first rod-shaped member and the second rod-shaped member (that is, the gap portion between the rod-shaped members) does not form a linear path from the engine room to the outside of the vehicle. The rod-shaped members of the first grill and the second grill are arranged. For example, the first rod-shaped member and the second rod-shaped member are alternately arranged in the vertical direction of the vehicle. Thereby, it can suppress effectively that the sound in an engine room does not inject into a sound-absorbing material at all, and is discharged | emitted outside the vehicle.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

[Configuration of front grill]
First, the configuration of the front grill according to the embodiment of the present invention will be described.

  FIG. 1 is a schematic diagram showing a configuration of a vehicle 10 to which a vehicle front grill according to the present embodiment is applied.

  The front grill 1 is disposed in a front portion of the vehicle 10 so as to be positioned between the hood 11 and the front bumper 12 and between the pair of headlights 13. The vehicle 10 includes a gasoline direct injection type engine (not shown).

  FIG. 2 is an enlarged view of the front grill 1 and shows a front view of the front grill 1. Note that FIG. 2 shows the vertical direction of the vehicle 10 in the vertical direction of the paper surface, and the vehicle width direction in the horizontal direction of the paper surface. In addition, the front-rear direction of the vehicle is shown in the vertical direction of the page (in FIG. 2, the arrows are shown in an oblique direction for convenience of explanation), the vehicle outer side is shown on the front side, and the engine room side is shown on the back side. ing.

  The front grill 1 is composed of an outer peripheral frame 7 and a plurality of rod-shaped members extending into the outer peripheral frame 7 (in this specification, a component composed of a plurality of rod-shaped members extending into the outer peripheral frame. Is called "grill"). Specifically, the front grill 1 according to the present embodiment is configured by arranging the grilles in two rows in the front-rear direction of the vehicle 10. That is, the front grill 1 has a double structure grille.

  Specifically, the front grill 1 includes a front grill 2 disposed on the vehicle outer side, and a rear grill 3 disposed on the engine room side with respect to the front grill 2. In the front grill 2 and the rear grill 3, a plurality of rod-like members are arranged substantially parallel to each other in the vertical direction of the vehicle 10. More specifically, the plurality of rod-shaped members are installed in the outer peripheral frame 7 so as to extend in the vehicle width direction, and are separated from each other in the vertical direction of the vehicle 10 by a certain distance. As shown in FIG. 2, when the front grill 1 is observed from the front of the vehicle, the rod-like member of the rear grill 3 is blocked by the front grill 2 and the whole image cannot be seen. Thus, the front grill 2 functions as the first grill in the present invention, and the rear grill 3 functions as the second grill in the present invention.

  FIG. 3 is a perspective view of the front grill 2 and the rear grill 3, and partially shows a cross-sectional view along the cutting line A1-A2 in FIG. As shown in FIG. 3, the front grill 1 has a double structure including a front grill 2 and a rear grill 3. The front grill 2 is arranged on the vehicle exterior (vehicle front) side with respect to the rear grill 3, and a plurality of rod-like members 4 are arranged substantially parallel to each other in the vertical direction of the vehicle 10. The rear grille 3 is arranged on the engine room side with respect to the front grille 2, and a plurality of rod-like members 5 different from the rod-like members 4 constituting the front grille 2 are arranged substantially parallel to each other in the vertical direction of the vehicle 10. Configured. The rod-shaped member 4 corresponds to a first rod-shaped member, and the rod-shaped member 5 corresponds to a second rod-shaped member.

  Further, the front grille 2 and the rear grille 3 are arranged apart from each other by a predetermined distance in the front-rear direction of the vehicle 10. The front grill 1 (specifically, the outer peripheral frame 7 and the rod-like members 4 and 5) is formed of resin or the like.

  FIG. 4 is a diagram showing in detail a cross-sectional view of the front grill 2 and the rear grill 3 along the cutting line A1-A2 in FIG. The bar-like member 4 constituting the front grill 2 is provided with a sound absorbing material 4a on the outer wall surface facing the engine room. In other words, the bar-like member 4 is provided with the sound absorbing material 4a only on the outer wall surface facing the engine room, and the sound absorbing material is not provided on the outer wall surface facing the outside of the vehicle. That is, the bar-like member 4 is provided with the sound absorbing material 4 a on the back side (engine room side) of the design surface of the front grill 1. On the other hand, the bar-shaped member 5 of the rear grille 3 is provided with a sound absorbing material 5a on the outer wall surface facing the engine room and a sound absorbing material 5b on the outer wall surface facing the front grille 2. That is, the rod-shaped member 5 is covered with the sound absorbing materials 5a and 5b in almost the entire outer wall surface. As described above, by providing the sound absorbing material 4a and the sound absorbing materials 5a and 5b, most of the sound entering the front grille 1 from the engine room side is directly incident on the sound absorbing material, or in the front grille 1 Reflected at some point and incident on the sound absorbing material, high sound absorbing performance can be obtained. In addition, since the sound absorbing material is difficult to see directly from the outside of the vehicle, the appearance (design) of the front grill 1 is not affected.

  The above-described sound absorbing materials 4a, 5a, 5b (hereinafter, the symbols in the “sound absorbing materials 4a, 5a, 5b” are omitted and simply referred to as “sound absorbing materials”) have a sheet-like form. These are fixed to the corresponding rod-like members 4 and 5 by adhesion or the like. The sound absorbing material is formed from a general material having sound absorbing properties. For example, the sound absorbing material is formed of felt, polyester fiber, inorganic fiber such as glass wool or rock wool, metal fiber such as aluminum fiber, synthetic resin foam such as polystyrene resin or polyethylene resin, porous material, etc. ing.

  The rod-like member 4 and the rod-like member 5 are formed of resin or the like. Moreover, these rod-shaped members 4 and 5 have a substantially U-shaped or concave cross section when viewed from the vehicle width direction of the vehicle 10, and concave portions 4b and 5c are formed on the engine room side. Sound absorbing materials 4a and 5a are provided over the entire surface of the recesses 4b and 5c. Therefore, not only the sound incident on the front grille 2 or the rear grille 3 almost horizontally from the engine room side, but also the sound incident obliquely as shown by the broken line arrow 9, both ends 4c and 5d of the recesses 4b and 5c. Is effectively absorbed by the sound absorbing material provided in the.

  The rod-like member 4 and the rod-like member 5 are arranged apart from each other in the front-rear direction of the vehicle 10. Further, the plurality of rod-like members 4 are arranged apart from each other in the vertical direction of the vehicle 10 by a predetermined interval d1, and the plurality of rod-like members 5 are also separated from each other in the vertical direction of the vehicle 10 by a predetermined interval d2. Are arranged. Here, the interval d1 between the rod-like members 4 is smaller than the vertical length of one rod-like member 5, and the interval d2 between the rod-like members 5 is smaller than the vertical length of one rod-like member 4. In addition, the rod-like members 4 and the rod-like members 5 are alternately arranged in the vertical direction of the vehicle, and the rod-like members 5 are arranged at least in a portion where the interval d1 of the rod-like members 4 exists, and at least the interval d2 of the rod-like members 5 The rod-shaped member 4 is arranged in the existing part.

  Therefore, the front grill 1 has a plurality of rod-like members 4 and 5 arranged in the horizontal direction without any gaps. In other words, the rod-like member 4 and the rod-like member 5 are arranged so that the space between the rod-like member 4 and the rod-like member 5 does not form a linear path from the engine room to the outside of the vehicle. By arranging the rod-like member 4 and the rod-like member 5 in this way, the sound entering from the engine room side in the horizontal direction is always absorbed by the sound absorbing material of one of the rod-like members. In this way, it is possible to prevent the sound in the engine room from being directly emitted to the outside of the sound absorbing material without being incident on the sound absorbing material while securing the outside air to the engine room. That is, according to the front grill 1 according to the present embodiment, it is possible to effectively reduce the noise in the engine room while ensuring the cooling performance for the engine.

[Effects of front grill]
Next, the effect of the front grill 1 will be described with reference to FIG.

  FIG. 5 is a cross-sectional view of the front grill 2 and the rear grill 3 taken along the cutting line A1-A2 in FIG.

  First, the sounds B1 to B5 radiated from the engine room will be described. Sounds B <b> 2 and B <b> 4 radiated from the engine room are incident on the sound absorbing material 5 a of the rod-like member 5 constituting the rear grille 3. On the other hand, the sounds B 1, B 3 and B 5 radiated from the engine room pass between the bar-like members 5 constituting the rear grille 3, but enter the sound absorbing material 4 a of the bar-like member 4 constituting the front grille 2. To do. Thus, the sound radiated from the engine room inevitably enters the sound absorbing materials 4a and 5a. This is because, as described above, the rod-like member 4 and the rod-like member 5 are arranged so that the space between the rod-like member 4 and the rod-like member 5 does not form a linear path from the engine room to the outside of the vehicle. It is because it arranged. As described above, according to the front grill 1 according to the present embodiment, the sound radiated from the engine room can surely enter the sound absorbing materials 4a and 5a. Therefore, the sound in the engine room can be effectively reduced by appropriately absorbing the sound in the engine room by the sound absorbing materials 4a and 5a.

  Next, the sounds C1 to C3 reflected by the sound absorbing material will be described. As described above, the rod-shaped members 4 and 5 have a substantially U-shaped cross section and are provided with the recesses 4b and 5c. Therefore, as indicated by the sounds C1 and C2, the sound reflected by the sound absorbing materials 4a and 5a in the recesses 4b and 5c is likely to enter the sound absorbing materials 4a and 5a in the recesses 4b and 5c again. On the other hand, as indicated by the sound C3, the sound reflected by the sound absorbing material 4a of the rod-like member 4 constituting the front grill 2 (specifically, reflected by the sound absorbing material 4a and again incident on the sound absorbing material 4a in the recess 4b). There is a high possibility that the sound that has not been made is incident on the sound-absorbing material 5b provided on the outer surface of the rod-shaped member 5 constituting the rear grill 3. Thus, by providing the sound absorbing material as in the front grill 1 according to the present embodiment, the sound radiated from the engine room is output a plurality of times before finally coming out from the front grill 1 to the front side of the vehicle. Is incident on the sound absorbing material. Therefore, according to the front grill 1 according to the present embodiment, the sound that goes out from the engine room to the front of the vehicle can be absorbed by the sound absorbing material a plurality of times, so the sound in the engine room that goes out of the vehicle is greatly increased. It is possible to reduce it.

  Next, the high-frequency sounds D1 and D2 that pass through the sound absorbing material will be described. The high frequency sound is emitted from, for example, a pump or an injector used in a direct injection type engine. Such high-frequency sound is not likely to be absorbed by the sound absorbing material, but is likely to pass through the sound absorbing material. In this case, since the rod-shaped members 4 and 5 are made of a material having rigidity such as a resin, high-frequency sound transmitted through the sound absorbing material can be insulated. For example, as shown by the sounds D1 and D2, the high frequency sound that has passed through the sound absorbing materials 4a and 5a is insulated by the rod-like members 4 and 5. Therefore, according to the front grill 1 which concerns on this embodiment, the high frequency sound in an engine room can be reduced appropriately.

  As described above, according to the front grill 1 according to the present embodiment, it is possible to appropriately reduce the sound over a wide band generated from a direct injection type engine or the like. Further, since the rod-like members 4 and 5 constituting the front grill 1 are appropriately spaced from each other, it is possible to ensure the ventilation of the outside air to the engine room and to ensure the cooling performance of the engine or the like. .

[Modification]
The present invention is not limited to application to a direct injection type engine. That is, the present invention can also be applied to engines other than direct injection engines. Since the front grill 1 can reduce sound over a wide band, sound radiated from an engine other than the direct injection engine can also be appropriately reduced.

  In the above embodiment, the front grille 2 and the rear grille 3 are configured by arranging the plurality of rod-like members 4 and 5 substantially horizontally in the vertical direction of the vehicle 10, but the present invention is not limited to this. In another example, the front grille and the rear grille can be configured by arranging the plurality of rod-like members 4 and 5 substantially vertically in the vehicle width direction. In still another example, the plurality of rod-like members 4 and 5 may be arranged in an oblique direction. That is, as long as the plurality of rod-like members 4 of the front grille 2 and the plurality of rod-like members 5 of the rear grille 3 are substantially parallel, the directions of the plurality of rod-like members 4 and 5 do not matter.

It is the schematic which shows the structure of the vehicle to which the front grill concerning this embodiment of this invention was applied. The front view of a front grill is shown. The perspective view of a front side grille and a rear side grille is shown. Sectional drawing of the front grille and the rear grille along the cutting line A1-A2 in FIG. 2 is shown. It is a figure for demonstrating the effect by the front grill concerning this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front grille 2 Front grille 3 Rear grille 4, 5 Bar-shaped member 4a, 5a, 5b Sound absorbing material 4b, 5c Concave part 7 Outer frame 10 Vehicle 11 Bonnet 12 Front bumper

Claims (3)

In the front grille of the vehicle provided on the front side of the engine room of the vehicle,
A first grill having a plurality of first rod-like members arranged substantially parallel to each other;
A second grille having a plurality of second bar-like members arranged apart from the first grille on the engine room side and arranged substantially parallel to each other and substantially parallel to the first bar-like member. And a vehicle front grill. The first rod-shaped member is provided with a sound absorbing material on an outer wall surface facing the engine room,
2. The vehicle according to claim 1, wherein the second rod-shaped member is provided with a sound absorbing material on an outer wall surface facing the first grill and an outer wall surface facing the engine room. Front grille. The first grill and the second grill are configured so that a space between the first grill and the second grill does not form a linear path from the engine room to the outside of the vehicle. The front grill of a vehicle according to claim 1 or 2, wherein the first bar-shaped member and the second bar-shaped member are arranged.

Images