JP2008260331A - Front part structure for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front part structure for an automobile reducing vibration of a cowl front member caused by resonance while enhancing rigidity of a side part of the cowl front member. <P>SOLUTION: The front part structure for the automobile is provided with a dash panel 5 for partitioning an engine room 1 and a cabin 2; the cowl front member 11 extending from the dash panel 5 toward a front side and having both side parts of the front part mounted to a suspension tower; and a cowl grille 23 having a rear end 23a supported on a windshield 9 and a front end mounted to a front part of the cowl front member 11. A dynamic damper 30 is mounted to a neighborhood to a central part of the cowl front member 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes a dash panel that partitions the engine room and the vehicle compartment in the front-rear direction, a cowl front member that extends forward from the dash panel, a front end attached to the front part of the cowl front member, and a rear end supported by the windshield. The present invention relates to a front structure of an automobile having a cowl grill.

Conventionally, there is a structure disclosed in Patent Document 1 as the front structure of the automobile in the above example.
That is, a dash panel that partitions the engine room and the rear passenger compartment is provided, a cowl front member that extends forward from the dash panel is provided, and the left and right sides of the front part of the cowl front member are used as suspension towers. On the other hand, the rear end of the cowl grille is supported by the windshield, and the front end of the cowl grille is attached to the front part of the above-described cowl front member.

  According to this conventional structure, since the left and right sides of the cowl front member extending in the vehicle width direction are attached to the suspension tower, there is an advantage that the vehicle body rigidity can be improved.

  However, although the above-described cowl front member is attached to the suspension tower at both left and right sides, the front lower surface of the middle part of the cowl front member is not supported, and the following problems occur.

That is, when the engine mount is provided across the upper surface of the front side frame and the suspension tower, the vibration of the engine is transmitted to the cowl front member via the engine mount and the suspension tower when the vehicle is traveling. Since the cowl front member has a resonance point at a specific frequency due to the structure described above, the cowl front member resonates, and the vibration is transmitted to the windshield via the cowl panel and to the windshield via the cowl grill. There was a problem that this windshield vibrates.
JP 2006-182197 A

  Therefore, the present invention provides a cowl front caused by resonance while improving the rigidity of the side portion of the cowl front member by attaching a dynamic damper to the vicinity of the center portion of the cowl front member having both front portions attached to the suspension tower. An object of the present invention is to provide a front structure of an automobile capable of reducing vibration of a member.

  A front structure of an automobile according to the present invention includes a dash panel that partitions an engine room and a rear passenger compartment, a cowl front member that extends forward from the dash panel and that has both side parts attached to the suspension tower. And a cowl grille having a rear end supported by the windshield and a front end attached to the front part of the cowl front member, and a front structure of the automobile, in the vicinity of the center part of the cowl front member. A dynamic damper is attached.

  According to the above configuration, since both sides of the front portion of the cowl front member are attached to the suspension tower, the rigidity of the cowl front member side portion can be improved.

  In addition, since a dynamic damper is attached near the center of the cowl front member, engine vibration or the like is transmitted to the cowl front member, and the cowl front member attempts to vibrate due to resonance at a resonance point of a specific frequency. It can be reduced by the damping action of the dynamic damper, and the vibration of the windshield can also be reduced.

  In one embodiment of the present invention, the cowl grill has a structure in which a front wall portion has a vertical wall portion, and a lower end of the vertical wall portion is attached to a front portion of the cowl front member. It is arrange | positioned in the position lower than the vertical wall part of a grill.

  According to the above configuration, since the dynamic damper is disposed at a position lower than the vertical wall portion of the cowl grille, adverse effects on pedestrian protection can be prevented.

  In other words, when the vehicle collides lightly with a pedestrian, the pedestrian's upper body is tilted to the upper part of the bonnet or cowl grille by paying the pedestrian's foot with the existing foot cleaning member provided in the vehicle. When the upper body of the pedestrian tilts to the upper part of the bonnet or cowl grille, the bonnet and cowl grille are deformed downward, especially when the cowl grille is deformed and moved downward by the pedestrian's head. Is present at a position lower than the vertical wall portion of the above-described cowl grill, so that adverse effects on pedestrian protection can be prevented.

  In one embodiment of the present invention, a horizontal flange portion is formed at each of the lower end of the vertical wall portion of the cowl grill and the front portion of the cowl front member, and both flange portions are flange-fastened. The dynamic damper is attached to the horizontal flange portion of the cowl front member.

  According to the above configuration, since the dynamic damper is attached to the horizontal flange portion of the cowl front member, it is possible to improve the assembling property (particularly, assembling property by retrofitting) of the dynamic damper.

  In one embodiment of the present invention, the dynamic damper includes a mounting bracket, a weight, and an elastic body interposed therebetween, and the mounting bracket is fastened to a horizontal flange portion of the cowl front member. And a vertical surface portion that extends downward from the rear end of the flat surface portion and to which the elastic body is fixed.

  According to the above configuration, the mounting blanket includes the flat surface portion and the vertical surface portion, and since the flat surface portion is fastened to the horizontal flange portion of the cowl front member, the assembly of the dynamic damper can be improved. In addition, the vertical surface portion described above extends downward from the rear end of the flat surface portion, and a weight is provided on the vertical surface portion below the flat surface portion via an elastic body, so that the weight can be disposed below. It is possible to reliably prevent adverse effects on pedestrian protection.

  In one embodiment of the present invention, the front end of the cowl front member has a front wall joined to the horizontal flange of the cowl front member and extending rearward, and extending downward from the rear end of the horizontal wall. And a vertical wall portion joined to a lateral wall portion of the cowl front member, and a cowl front cross member that forms a closed cross-section with the cowl front member, and the dynamic damper is connected to the cowl front cross member. It is attached to the side wall part of.

  According to the above configuration, the cowl front member and the cowl front cross member have a closed cross section extending in the vehicle width direction between them, so that the rigidity of the front portion of the cowl front member can be improved. Since the above-described dynamic damper is attached to the lateral wall portion of the cowl front cross member that forms the closed cross section, the formation of the dynamic damper attachment portion is facilitated, and the attachment rigidity of the dynamic damper can be improved.

  In one embodiment of the present invention, in a vehicle capable of setting a right-hand drive vehicle and a left-hand drive vehicle, the cowl front member is common to the right-hand drive vehicle and the left-hand drive vehicle, and a wiper support bracket for supporting the wiper is provided. A right-hand drive vehicle and a left-hand drive vehicle are attached to a mounting portion at a position shifted from the center of the cowl front member to one side or the other side in the vehicle width direction. It is attached to the attachment part via the attachment bracket.

  According to the above configuration, a common cowl front member may be processed in a right-hand drive vehicle and a left-hand drive vehicle having a wiper support bracket mounting portion and a dynamic damper mounting bracket mounting portion. It is not necessary to process the cowl front member separately for the left-hand drive vehicle and the left-hand drive vehicle. As a result, it is not necessary to form a mounting portion dedicated to the dynamic damper, and the workability of the cowl front member can be improved.

  Specifically, in a right-hand drive vehicle, a wiper support bracket is attached to a mounting portion that is shifted to the right side in the vehicle width direction from the center of the cowl front member, and a dynamic damper is attached to the remaining mounting portion, that is, a mounting portion that is shifted to the left side. Install the mounting bracket.

  In a left-hand drive vehicle, the wiper support bracket is attached to the mounting portion that is shifted to the left in the vehicle width direction from the center of the cowl front member, and the dynamic damper is mounted to the remaining mounting portion, that is, the mounting portion that is shifted to the right side. Install the bracket.

  With such a configuration, it is not necessary to form a mounting portion dedicated to the dynamic damper, and the workability of the cowl front member is improved.

  In one embodiment of the present invention, the one-side mounting portion is formed by a pair of mounting holes that are separated from each other in the left-right direction, and the other-side mounting portion is separated from each other by a distance equal to the spacing pitch of the pair of mounting holes. A pair of mounting holes equal to the separation pitch of the pair of mounting holes are formed on both the mounting bracket of the dynamic damper and the wiper support bracket.

  According to the above configuration, the spacing pitches of the pair of mounting holes respectively formed in the mounting portion on one side, the mounting portion on the other side, the mounting bracket for the dynamic damper, and the wiper support bracket are formed to be equal to each other. Therefore, it is possible to easily set the right-hand drive vehicle and the left-hand drive vehicle only by selecting the mounting positions of the dynamic damper mounting bracket and the wiper support bracket.

  In one embodiment of the present invention, a cowl front cross member is formed which is joined to the front portion of the cowl front member and forms a closed cross section extending in the vehicle width direction with the cowl front member, and the dynamic damper is closed. It is arranged in the cross section.

  According to the above configuration, since the dynamic damper is disposed within the closed cross section, it is possible to reliably prevent adverse effects on pedestrian protection and adversely affect other vehicle components disposed in the cowl box (layout restrictions and service work). Deterioration of the sex etc.) can be prevented.

  According to the present invention, since the dynamic damper is attached to the vicinity of the center portion of the cowl front member whose both front portions are attached to the suspension tower, the cowl front caused by resonance is improved while improving the rigidity of the side portion of the cowl front member. There is an effect that the vibration of the member can be reduced.

  A dash panel that partitions the engine room and the rear compartment of the engine room from the dash panel to the front is provided for the purpose of reducing the vibration of the cowl front member due to resonance while improving the rigidity of the side part of the cowl front member. A cowl front member that extends toward the front and has both front sides attached to the suspension tower, a rear end supported by the windshield, and a front end that is attached to the front part of the cowl front member. In the front structure of an automobile, a dynamic damper is installed near the center of the cowl front member.

An embodiment of the present invention will be described below in detail with reference to the drawings.
1 is a perspective view showing a front structure of an automobile, FIG. 2 is an enlarged perspective view showing a main part of FIG. 1, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. FIG. 5 is a cross-sectional view taken along line B-B and FIG. 5 is a cross-sectional view taken along line C-C in FIG. In addition, the front structure of the automobile of this embodiment is substantially symmetrical.

  1 to 5, a dash lower panel 3 that partitions the engine room 1 and the rear compartment 2 in the front-rear direction is provided. As shown in FIG. 3, the upper bent portion 3 a of the dash lower panel 3 includes a dash upper panel. The panel 4 is joined and fixed, and the dash upper panel 4 and the dash lower panel 3 constitute a dash panel 5.

As shown in FIGS. 1 to 7 (however, FIG. 6 is a perspective view of a cowl box and FIG. 7 is an exploded perspective view of a cowl box), the above-described dash upper panel 4 is a panel extending in the vehicle width direction. As shown in FIGS. 3 and 7, the middle portion of the dash upper panel 4 excluding both ends in the vehicle width direction includes a lower end bent portion 4 a, a vertical wall portion 4 b, and an upper end bent portion 4 c. As shown in FIGS. 4, 5, and 7, the upper panel 4 extends further forward from the lower bent portion 4 a in addition to the case elements 4 a, 4 b, and 4 c, as shown in FIGS. 4, 5, and 7. An extending portion 4d and an extending portion 4e extending obliquely forward and upward from the front end of the extending portion 4d are provided.
As shown in FIGS. 4 and 5, the extension 4 e of the above-described dash upper panel 4 is bonded and fixed to a rear wall portion 10 a of the suspension tower 10 (hereinafter simply referred to as a suspension tower).

  As shown in FIGS. 3, 4, and 5, there is a substantially inverted L-shaped cross section between the lower end bent portion 4 a of the dash upper panel 4 and the upper end bent portion 4 c of the dash upper panel 4. A cowl panel 6 extending in the width direction is joined and fixed, and a closed cross section 7 extending in the vehicle width direction is formed between the cowl panel 6 and the dash upper panel 4.

  Moreover, the lower end part of the windshield 9 is supported by the windshield support part 6a of the above-mentioned cowl panel 6 via the insertion pin 8 and the adhesive agent (not shown).

  As shown in FIG. 3, a cowl front member 11 extending forward from the dash lower panel 3 is provided. As shown in FIGS. 3 and 7, the cowl front member 11 includes a lateral wall portion 11a (so-called bottom wall portion) extending forward from a corresponding portion of the upper end bent portion 3a of the dash lower panel 3, and a lateral wall portion 11a. A member extending in the vehicle width direction integrally formed with a vertical wall portion 11b extending upward from the front end and a horizontal flange portion 11c extending forward from the upper end of the vertical wall portion 11b, the cowl front member 11 As shown in FIGS. 4 and 5, both side portions of the front portion, that is, left and right side portions of the horizontal flange portion 11 c are attached to the suspension tower 10 via auxiliary members 12. Here, the above-described reinforcing member 12 is joined across the upper wall portion 10b of the suspension tower 10 from the rear wall portion 10a.

  As shown in FIG. 3, a cowl front cross member 13 having a substantially inverted L-shaped cross section and extending in the vehicle width direction is provided at the front portion of the above-described cowl front member 11, and the above-described cowl front member 11, A closed cross section 14 extending in the vehicle width direction is formed between the cowl front cross member 13.

  As shown in FIGS. 3, 4, 5, and 7, the cowl front cross member 13 has a front wall that is joined to the horizontal flange portion 11 c of the cowl front member 11 and extends rearward. A vertical wall portion 13 b that extends downward from the rear end of the horizontal wall portion 13 a and is joined to the horizontal wall portion 11 a of the cowl front member 11 is provided. In this embodiment, a joint flange portion 13b extending rearward from the lower end of the vertical wall portion 13b of the cowl front cross member 13 is integrally formed, and the joint flange portion 13c is joined to the upper surface of the horizontal wall portion 11a of the cowl front member 11 described above. The closed cross section 14 is formed between the cowl front member 11 and the cowl front cross member 13 by being fixed.

  6 and 7 are perspective views of the cowl box 15. The cowl box 15 includes the above-described dash upper panel 4, the cowl panel 6, the cowl front member 11, and the cowl front cross member 13. The left and right side brackets 16, 16 for connecting the front and rear ends of the cowl box 15 are provided on the left and right sides of the cowl box 15. That is, the cowl box 15 is configured by a so-called open cowl-shaped box body having a so-called open cowl structure in which the upper part is opened as shown in FIG. 6 by the elements 4, 6, 11, 13, and 16.

  As shown in FIG. 4, a reinforcing member 17 is provided on the rear wall portion 10 a of the suspension tower 10 corresponding to the extended portion 4 d of the dash upper panel 4. The cowl front member 11 and the dash upper panel 4 are fastened together using a mounting member such as a nut 19. Specifically, the lateral wall portion 11 a of the cowl front member 11 and the extending portion 4 d of the dash upper panel 4 are fixed together. ing.

  The front end portion 16a of the side bracket 16 shown in FIGS. 6 and 7 is located on the rear wall portion 10a of the suspension tower 10, and as shown in FIG. The horizontal wall portion 13a of the cowl front cross member 13, the horizontal flange portion 11c of the cowl front member 11, and the front end portion 16a of the side bracket 16 are fixed together by using an attachment member such as a nut 21.

  As shown in FIGS. 3 and 4, the member facing the lower side of the rear end of the cowl front member 11 (see the cowl panel 6 in FIG. 3 and the extended portion 4d of the dash upper panel 4 in FIG. 4). A seal member 22 that prevents intrusion of rainwater or the like is provided between them.

  3, 4, and 5, the rear end 23 a is supported by the lower portion and the surface of the windshield 9, and the front end is attached to the front portion of the above-described cowl front member 11. Is provided.

  The cowl grill 23 is a synthetic resin grill that covers the upper opening of the cowl box 15 having an open cowl structure so that outside air can be introduced. The cowl grill 23 includes a vertical wall portion 23b at the front thereof. The lower end of the vertical wall portion 23b is configured to be attached to the front portion of the cowl front member 11.

  A horizontal flange portion 23c extending forward from the lower end is integrally formed at the lower end of the vertical wall portion 23b of the cowl grill 23 described above. As shown in FIG. 3, the horizontal wall portion 13a of the cowl front cross member 11 is Accordingly, the horizontal flange portion 23c of the cowl grille 23 and the horizontal flange portion 11c of the cowl front member 11 are both flange-fastened. In this embodiment, the three elements 23c, 13a, and 11c are flange-fastened.

  On the other hand, as shown in FIGS. 1 and 2, the inner lower part of the suspension tower 10 is joined and fixed to the front side frame 24. The front side frame 24 is a vehicle body rigid member that extends in the front-rear direction of the vehicle on both the left and right sides of the engine room 1, and is provided at the rear end of the pair of left and right front side frames 24 at the bottom of the floor panel. (Not shown) are arranged so as to be continuous in the front-rear direction.

  Further, as shown in FIG. 1, an apron reinforcement 25 is joined and fixed to the outer upper portion of the suspension tower 10.

  Further, as shown in FIGS. 1 and 2, a cowl side panel 27 is provided which is connected to the apron reinforcement 25 described above in the front-rear direction and connects the apron reinforcement 25 and the hinge pillar 26 in the front-rear direction. ing.

  The cowl side panel 27 is a vehicle body rigid member having a closed cross section extending in the front-rear direction by joining and fixing the cowl side panel outer and the cowl side panel inner.

  Further, in this embodiment, as shown in FIG. 1, an engine mount 28 is mounted across the upper surface of the front side frame 24 and the wheel arch 10c on the vehicle front side of the suspension tower 10, and this engine An engine (not shown) is mounted and supported via the mount 28.

  As described above, when the engine mount 28 is mounted across both the front side frame 24 and the suspension tower 10, the engine vibration is transmitted to the cowl front member 11 via the engine mount 28 and the suspension tower 10 when the vehicle travels. The cowl front member 11 is transmitted and resonates and vibrates at a resonance point of a specific frequency. For the purpose of attenuating such vibration, the cowl front member 11 is located near the center of the cowl front member 11 in FIGS. As shown in FIG. 8, a dynamic damper 30 is attached.

  FIG. 8 is a perspective view showing the main part of the front structure of the automobile in a state where the cowl front member 11 and the cowl front cross member 13 are combined, as viewed from the rear and above the vehicle. FIG. FIG. 10 is a perspective view showing the dynamic damper 30 with the weight 32 omitted.

  As shown in FIGS. 3, 9, and 10, the dynamic damper 30 described above includes a mounting bracket 31, a weight 32, and a pair of left and right elastic bodies 33 and 33 interposed between the both 31 and 32. ing. Here, the elastic bodies 33, 33 are made of rubber or the like.

  The mounting bracket 31 described above includes a flat portion 31a fastened to the horizontal flange portion 11c of the cowl front member 11 via the lateral wall portion 13a of the cowl front cross member 13, and a lower portion from the rear end of the flat portion 31a. And a pair of left and right weight support portions 31c, 31c integrally bent from the left and right ends of the vertical surface portion 31b to the rear, and between the pair of left and right weight support portions 31c, 31c. The weight 32 is supported through the elastic bodies 33, 33 described above.

  Further, as shown in FIGS. 9 and 10, in the mounting bracket 31 described above, a reinforcing rib 34 is integrally formed at a part of the corner portion of the flat surface portion 31a and the vertical surface portion 31b, and the mounting bracket 31 itself is formed. The rigidity is improved.

  Moreover, the above-described dynamic damper 30 is disposed at a position lower than the vertical wall portion 23b of the cowl grille 23 as shown in FIG.

  That is, the flat surface portion 31a of the mounting bracket 31 is attached to the horizontal wall portion 13a of the cowl front cross member 13 using mounting members such as bolts 35 and nuts 36, and the cowl front member 11 is connected via the horizontal wall portion 13a. By attaching and fixing to the horizontal flange portion 11c, the weight 32 of the dynamic damper 30 is configured to be lower than the horizontal flange portion 11c.

  By the way, the above-mentioned cowl box 15 is provided with a wiper device 40 as shown in FIGS. The wiper device 40 includes a wiper motor 41, left and right wiper links 42, 42, left and right pivot arms 43, 43, left and right wiper pivots 44, 44, left and right pivot holder brackets 45, 45, and a connecting frame 46. And.

  The vehicle of this embodiment can be set to a right-hand drive vehicle or a left-hand drive vehicle. When the right-hand drive vehicle is set as shown in FIGS. The pivot holder bracket 45 is fixed to the side bracket 16 on the same side, and the left pivot holder bracket 45 is fixed to a wiper support bracket 47 that supports the wiper device 40.

  As shown in FIGS. 6 and 7, the cowl front member 11 and the cowl front cross member 13 are configured so as to be commonly used in right-hand drive vehicles and left-hand drive vehicles. The member 13 has a pair of mounting holes 50 and 50 that are separated from each other as mounting portions at both positions shifted from the center in the vehicle width direction to one side and the other side in the vehicle width direction, and a pair of mounting holes 51, 51 are formed.

  The spacing pitch between the pair of mounting holes 50 and 50 offset to the right side described above and the spacing pitch between the pair of mounting holes 51 and 51 offset to the left side are formed to be equal to each other.

  In addition, a pair of mounting holes 52 and 52 spaced apart from each other are formed in the flat portion 31a of the mounting bracket 31 in the dynamic damper 30 described above, and a pair of mounting holes spaced apart from each other in the left and right are also formed in the wiper support bracket 47 described above. 53 and 53 are formed, and the spacing pitch between the mounting holes 52 and 52 and the spacing pitch between the mounting holes 53 and 53 are equal to the spacing pitch between the mounting holes 50 and 50 and the mounting holes 51 and 51, respectively. Is formed.

  1 and 2, when the right-hand drive vehicle is set, the wiper support bracket 47 is attached to the right side mounting holes 50 and 50 shown in FIGS. The dynamic damper 30 is attached to the remaining mounting holes, that is, the left-side mounting holes 51 and 51 (see FIGS. 6 and 7) with a bolt 35 and a nut. Install using fasteners such as 36.

  On the other hand, when the left-hand drive vehicle is set as shown in FIGS. 11 and 12, the wiper support bracket 47 is attached to the left side mounting holes 51 and 51 shown in FIGS. The dynamic damper 30 is mounted using a fastener such as a nut (not shown), and the dynamic damper 30 is attached to the remaining mounting holes, that is, the mounting holes 50 and 50 on the right side (see FIGS. 6 and 7). Use a fastener such as (see Fig. 3).

  11 and 12, when the left-hand drive vehicle is set, the left pivot holder bracket 45 of the wiper device 40 is fixed to the same side bracket 16 and the right pivot holder bracket 45 is fixed. May be fixed to a wiper support bracket 47 that supports the wiper device 40.

  Also, corresponding to the rear portion of the wiper support bracket 47, as shown in FIGS. 2, 6, 7, and 12, the cowl panel 6 has one side in the vehicle width direction and the other side from the center in the vehicle width direction. Mounting seats 6b and 6c are formed at positions shifted from the side, respectively, and when setting to a right-hand drive vehicle, as shown in FIG. 2, the mounting seat 6b for offsetting the rear portion of the wiper support bracket 47 to the right side. When the vehicle is set to a left-hand drive vehicle, as shown in FIG. 12, the rear portion of the wiper support bracket 47 is fixed to a mounting seat 6c offset to the left side.

  In the figure, arrow F indicates the front of the vehicle, and arrow R indicates the rear of the vehicle. In FIG. 11, 55 is a front pillar.

  As described above, the front structure of the automobile of the above embodiment has a dash panel 5 that partitions the engine room 1 and the vehicle compartment 2 behind the engine room 1, and extends forward from the dash panel 5. A front part of a vehicle including a cowl front member 11 attached to the suspension tower 10, a rear end 23a supported by the windshield 9, and a front end attached to the front part of the cowl front member 11. There is a structure, and a dynamic damper 30 is attached in the vicinity of the center portion of the cowl front member 11 (see FIGS. 1, 3, and 4).

  According to this configuration, since both side portions of the front portion of the cowl front member 11 are attached to the suspension tower 10, the rigidity of the cowl front member 11 side portion can be improved.

  Moreover, since the dynamic damper 30 is attached in the vicinity of the center of the cowl front member 11, engine vibration or the like is transmitted to the cowl front member 11, and the cowl front member 11 vibrates due to resonance at a resonance point of a specific frequency. This can be reduced by the damping action of the dynamic damper 30, and hence the vibration of the windshield 9 can also be reduced.

  The cowl grill 23 has a structure in which a vertical wall portion 23b is provided at a front portion, and a lower end of the vertical wall portion 23b is attached to a front portion of the cowl front member 11. The dynamic damper 30 includes the cowl grille 23. It is arrange | positioned in the position lower than the vertical wall part 23b (refer FIG. 3).

  According to this configuration, since the dynamic damper 30 is disposed at a lower position than the vertical wall portion 23b of the cowl grille 23, adverse effects on pedestrian protection can be prevented.

  That is, when the vehicle collides lightly with a pedestrian, the pedestrian's upper body is tilted to the upper part of the bonnet or the cowl grill 23 by paying the pedestrian's foot with the existing foot cleaning member provided in the vehicle. When the upper body of the pedestrian tilts to the upper part of the hood or cowl grille 23, the bonnet and the cowl grille 23 are deformed downward, particularly when the cowl grille 23 is deformed and moved downward by the head of the pedestrian. Since the position of the dynamic damper 30 exists at a position lower than the vertical wall portion 23b of the cowl grill 23 described above, adverse effects on pedestrian protection can be prevented.

  Further, horizontal flange portions 23c and 11c are formed at the lower end of the vertical wall portion 23b of the cowl grille 23 and the front portion of the cowl front member 11, respectively, and both flange portions 23c and 11c are flange-fastened. The dynamic damper 30 is attached to the horizontal flange portion 11c of the cowl front member 11 (see FIG. 3).

  According to this configuration, since the dynamic damper 30 is attached to the horizontal flange portion 11c of the cowl front member 11, it is possible to improve the assembling property of the dynamic damper 30 (particularly, the assembling property by retrofitting).

  In addition, the dynamic damper 30 includes a mounting bracket 31, a weight 32, and an elastic body 33 interposed between the both 31 and 32, and the mounting bracket 31 is a horizontal flange of the cowl front member 11. A flat surface portion 31a fastened to the portion 11c, and a vertical surface portion 31b extending downward from the rear end of the flat surface portion 31a to which the elastic body 33 is fixed (see FIGS. 3 and 9). .

  According to this configuration, the mounting bracket 31 includes the flat surface portion 31a and the vertical surface portion 31b, and the flat surface portion 31a is fastened to the horizontal flange portion 11c of the cowl front member 11, so that the assembly of the dynamic damper 30 is improved. Can be achieved. Moreover, the vertical surface portion 31b described above extends downward from the rear end of the flat surface portion 31a, and the weight 32 is provided on the vertical surface portion 31b located below the flat surface portion 31a via the elastic body 33. It can arrange | position below and can prevent the bad influence with respect to pedestrian protection reliably.

  In addition, the front end of the cowl front member 11 is joined to the horizontal flange portion 11c of the cowl front member 11, and the rear wall 13a extends rearward and extends downward from the rear end of the horizontal wall 13a. The dynamic damper 30 includes a cowl front cross member 13 that includes a vertical wall portion 13b joined to the horizontal wall portion 11a of the cowl front member 11 and forms a closed cross section 14 with the cowl front member 11. Is attached to the lateral wall portion 13a of the cowl front cross member 13 (see FIG. 3).

  According to this configuration, since the cowl front member 11 and the cowl front cross member 13 form the closed cross section 14 extending in the vehicle width direction between the two members 11, 13, the rigidity of the front portion of the cowl front member 11 is improved. In addition, since the dynamic damper 30 is attached to the lateral wall portion 13a of the cowl front member 13 forming the closed cross section 14, the dynamic damper 30 attachment portion can be easily formed and the closed The cross section 14 can improve the mounting rigidity of the dynamic damper 30.

  Further, in a vehicle capable of setting a right-hand drive vehicle and a left-hand drive vehicle, the cowl front member 11 is common to the right-hand drive vehicle and the left-hand drive vehicle, and a wiper support bracket 47 that supports the wiper (see the wiper device 40). Is attached to the mounting portion (refer to one of the mounting holes 50 and 51) at a position shifted from the center of the cowl front member 11 to either one side or the other side in the vehicle width direction in the right-hand drive vehicle and the left-hand drive vehicle. The dynamic damper 30 is attached and attached to one of the other remaining attachment portions (see the other of the attachment holes 50 and 51) via the attachment bracket 31 (see FIGS. 1, 11, and 6). .

  According to this configuration, the cowl front member 11 that is common to the right-hand drive vehicle and the left-hand drive vehicle including the attachment portion of the wiper support bracket 47 and the attachment portion of the attachment bracket 31 of the dynamic damper 30 may be processed. Therefore, it is not necessary to process the cowl front member 11 separately for each of the right-hand drive vehicle and the left-hand drive vehicle. As a result, it is not necessary to form a mounting portion dedicated to the dynamic damper 30 and the workability of the cowl front member 11 is improved. Can be achieved.

  Specifically, in a right-hand drive vehicle, as shown in FIG. 1, the wiper support bracket 47 is attached to the attachment portion (see the attachment hole 50) at a position shifted from the center of the cowl front member 11 to the right side in the vehicle width direction and remains. The mounting bracket 31 of the dynamic damper 30 is attached to the mounting portion (see the mounting hole 51), that is, the mounting portion shifted to the left side (the mounting hole 51).

  In the left-hand drive vehicle, as shown in FIG. 11, the wiper support bracket 47 is attached to an attachment portion (see attachment holes 51) at a position shifted from the center of the cowl front member 11 to the left side in the vehicle width direction. In other words, the mounting bracket 31 of the dynamic damper 30 is mounted on the mounting portion (the mounting hole 50) at a position shifted to the right side.

  With this configuration, it is not necessary to form a mounting portion dedicated to the dynamic damper 30 and the workability of the cowl front member 11 is improved.

  Further, the one-side mounting portion is formed by a pair of mounting holes 50 and 50 that are spaced apart from each other left and right, and the other-side mounting portion is a pair of spaces that are spaced from each other by a distance equal to the spacing pitch of the pair of mounting holes 50 and 50. A pair of mounting holes 52, 52, 53 are formed on the mounting brackets 31 of the dynamic damper 30 and the wiper support bracket 47, and are equal to the spacing pitch of the pair of mounting holes 50, 50. , 53 are formed (see FIG. 7).

  According to this configuration, the pair of mounting holes 50, 51, 52 formed in the mounting portion on one side, the mounting portion on the other side, the mounting bracket 31 for the dynamic damper 30, and the bracket 47 for wiper support, respectively. , 53 are formed to be equal to each other, the right-hand drive vehicle and the left-hand drive vehicle can be easily set only by selecting the mounting position of the mounting bracket 31 of the dynamic damper 30 and the wiper support bracket 47. it can.

  FIG. 13 shows another embodiment of the dynamic damper mounting structure. In this embodiment shown in FIG. 13, before assembling the cowl front member 11 and the cowl front cross member 13, the vertical surface portion of the cowl front cross member 13 is shown. The dynamic damper 30 is attached to the front surface of 13b using attachment members such as bolts 35 and nuts 36.

  The dynamic damper 30 described above includes a mounting bracket 31, a weight 32, and an elastic body 33 interposed between the both 31 and 32, while the mounting bracket 31 includes a mounting piece 31d oriented in the vertical direction, The mounting piece 31d has a pair of left and right weight support pieces 31e, 31e integrally bent forward from both left and right end portions, and elastic bodies 33, 33 between the left and right weight support pieces 31e, 31e. A weight 32 is attached to the dynamic damper 30 so that after the cowl front member 11 and the cowl front cross member 13 are assembled, the dynamic damper 30 is positioned within the closed section 14 between the two members 11 and 13. It is configured.

  In short, the embodiment shown in FIG. 13 includes a cowl front cross member 13 which is joined to the front portion of the cowl front member 11 and forms a closed cross section 14 extending in the vehicle width direction with the cowl front member 11. The dynamic damper 30 is disposed in the closed cross section 14.

  According to this configuration, since the dynamic damper 30 is disposed in the closed cross section 14, it is possible to reliably prevent adverse effects on pedestrian protection and to adversely affect other vehicle components disposed in the cowl box (such as layout restrictions and Deterioration of service workability etc.) can be prevented.

  Further, the structure of the mounting bracket 31 can be simplified. In the embodiment shown in FIG. 13 as well, the other configurations, operations, and effects are almost the same as those in the previous embodiment. Therefore, in FIG. 13, the same parts as those in FIG. Detailed description thereof will be omitted.

  In the correspondence between the configuration of the present invention and the above-described embodiment, the suspension tower of the present invention corresponds to the suspension tower 10 of the embodiment. Similarly, the wiper corresponds to the wiper device 40, and one of the cowl front members. The mounting portions provided on the side and the other side correspond to the mounting holes 50 and 51 provided in the cowl front cross member 13, but the present invention is not limited to the configuration of the above-described embodiment. .

The perspective view which shows the front part structure of the motor vehicle of this invention 1 is an enlarged perspective view of the main part of FIG. 2 is a cross-sectional view taken along line AA in FIG. 2 is a cross-sectional view taken along line BB in FIG. CC sectional view taken on line CC in FIG. Cowl box perspective view Exploded perspective view of cowl box A perspective view of a state in which the cowl front member and the cowl front cross member are combined. The principal part expansion perspective view of FIG. A perspective view of a dynamic damper with a weight omitted Perspective view when setting to left-hand drive vehicle The principal part expansion perspective view of FIG. Side view showing another embodiment of dynamic damper mounting structure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine room 2 ... Car compartment 5 ... Dash panel 9 ... Windshield 10 ... Suspension tower (suspension tower)
DESCRIPTION OF SYMBOLS 11 ... Cowl front member 11a ... Horizontal wall part 11c ... Horizontal flange part 13 ... Cowl front cross member 13a ... Horizontal wall part 13b ... Vertical wall part 14 ... Closed cross section 23 ... Cowl grille 23a ... Rear end 23b ... Vertical wall part 23c ... Horizontal flange Part 30 ... Dynamic damper 31 ... Mounting bracket 31a ... Plane part 31b ... Vertical surface part 32 ... Weight 33 ... Elastic body 40 ... Wiper device (wiper)
47 ... Wiper support bracket 50, 51 ... Mounting hole (mounting part)
52, 53 ... mounting holes

Claims (8)

A dash panel that partitions the engine room and the vehicle compartment behind it;
A cowl front member extending forward from the dash panel and having both sides attached to the suspension tower;
A front end of an automobile having a rear end supported by the windshield and a front end attached to a front portion of the cowl front member, and a cowl grille,
A front structure of an automobile, wherein a dynamic damper is attached near the center of the cowl front member. The cowl grill is provided with a vertical wall portion at a front portion, and a lower end of the vertical wall portion is attached to a front portion of the cowl front member,
2. The front structure of an automobile according to claim 1, wherein the dynamic damper is disposed at a position lower than a vertical wall portion of the cowl grill. A horizontal flange portion is formed at each of a lower end of the vertical wall portion of the cowl grill and a front portion of the cowl front member, and both flange portions are flange-fastened.
3. The front structure of an automobile according to claim 2, wherein the dynamic damper is attached to a horizontal flange portion of a cowl front member. The dynamic damper is composed of a mounting bracket, a weight, and an elastic body interposed therebetween,
A flat portion where the mounting bracket is fastened to a horizontal flange portion of the cowl front member;
4. The front structure of an automobile according to claim 3, further comprising a vertical surface portion extending downward from a rear end of the flat portion and to which the elastic body is fixed. The front end of the cowl front member has a front end joined to the horizontal flange portion of the cowl front member and extends rearward, and extends downward from the rear end of the lateral wall portion and is joined to the lateral wall portion of the cowl front member. Comprising a cowl front cross member that is formed from a vertical wall portion that forms a closed cross-section with the cowl front member,
5. The front structure of an automobile according to claim 3, wherein the dynamic damper is attached to a lateral wall portion of the cowl front cross member. In cars that can be set to right-hand drive and left-hand drive vehicles,
The cowl front member is common to right-hand drive vehicles and left-hand drive vehicles,
A wiper support bracket for supporting the wiper is attached to a mounting portion at a position shifted from the center of the cowl front member to one of the vehicle width direction and the other side in the right-hand drive vehicle and the left-hand drive vehicle.
6. The front structure of an automobile according to claim 4, wherein the dynamic damper is attached to one of the other remaining attachment portions via the attachment bracket. The mounting portion on the one side is formed by a pair of mounting holes that are separated from each other on the left and right.
The mounting portion on the other side is formed by a pair of mounting holes that are spaced from each other to the left and right equal to the spacing pitch of the pair of mounting holes.
7. The front structure of an automobile according to claim 6, wherein a pair of mounting holes equal to a spacing pitch of the pair of mounting holes are formed in both the mounting bracket of the dynamic damper and the wiper support bracket. A cowl front cross member joined to the front part of the cowl front member and forming a closed cross section extending in the vehicle width direction with the cowl front member;
3. The front structure of an automobile according to claim 2, wherein the dynamic damper is disposed in the closed cross section.

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