JP2013212788A - Vehicle front body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle front body structure capable of reducing vibration and noise inside a cabin without increasing dash panel weight.SOLUTION: Vehicle front body structure includes a dash lower panel 1 and a dash upper panel 2 constituting a cabin front wall. The dash lower panel 1 includes a body panel 11 with a fundamental surface 11a, and a first projection 14 projecting vehicle body backwards from the fundamental surface 11a and extending in a vehicle width direction. The first projection 14 includes plane surface parts 16a, 16b, 16c having almost the same surface level as that of the fundamental surface 11a and dividing the first projection 14 in the vehicle width direction. Thus, parting/nearing action can be reduced between upper and lower ends of an open cross section formed by the first projection 14 without increasing dash panel weight.

Description

  The present invention relates to a front vehicle body structure of a vehicle, and more particularly to a front vehicle body structure of a vehicle including a dash panel that constitutes a front wall portion of a passenger compartment and a dash upper panel that is connected to an upper end of the dash panel.

  Conventionally, it has been known that room noise is generated by a booming noise of an engine, road noise, or the like when the vehicle travels. In particular, road noise, which accounts for a large percentage of room noise, is caused by solid propagation sound that occurs when the tires and suspension links vibrate up and down due to the unevenness of the road surface, and this vertical vibration vibrates the surface members constituting the passenger compartment. It is the main factor.

  Of the passenger compartment components, the dash panel that divides the engine compartment and the passenger compartment forward and backward has a wide basic surface portion in the main body panel portion. Therefore, this basic surface portion is vibrated by vertical vibrations such as suspension links, and has a predetermined frequency band. Longitudinal vibrations are easily generated, and further, vertical vibrations are generated in a cowl box connected to the upper end of the dash panel in accordance with the longitudinal vibration of the dash panel. In view of this, a technique for reducing indoor noise by increasing the rigidity of the dash panel, which has a great influence on road noise, and suppressing the longitudinal vibration of the basic surface portion has been proposed.

  The cowl structure of the vehicle of Patent Document 1 includes a dash lower panel (dash panel) and a dash upper panel connected to the upper end of the dash lower panel, and has a cross-sectional hat-shaped dash extending in the vehicle width direction on the upper rear side of the dash lower panel. A cross member is joined, and a dash cross closed section extending in the vehicle width direction is formed between the dash cross member and the dash lower panel.

JP 2011-37288 A

  Since the dash cross member extending in the vehicle width direction is joined to the rear side of the dash lower panel in the cowl structure of the vehicle of Patent Document 1, the basic surface portion of the dash lower panel can be reinforced with the dash cross member and is generated in the vehicle interior. Noise measures can be taken. However, in the technique of Patent Document 1, since the total area of the dash lower panel is increased, the weight of the dash lower panel is increased by the dash cross member, resulting in an increase in the weight of the vehicle body.

  Therefore, as a result of examining a structure capable of increasing the rigidity of the basic surface portion of the dash panel while omitting the dash cross member, an open cross section extending in the vehicle width direction was configured instead of the closed cross section by adding the dash cross member. I came up with a dash panel structure. In this structure, the dash cross member can be omitted by forming integrally with the dash panel a protruding portion that protrudes from the basic surface portion of the main body panel portion of the dash panel in the vehicle longitudinal direction and extends in the vehicle width direction. However, as a result of verifying the performance of this dash panel structure, it has been found that the dash panel can be reduced in weight and rigidity as compared with the technique of Patent Document 1, but introduces the following new problems. .

  Since an open cross section extending in the vehicle width direction is formed on the basic surface portion of the main body panel portion of the dash panel, the upper and lower ends of the opening of the open cross section, the upper and lower base ends of the so-called projecting portion are caused by vertical vibrations of the suspension link etc. Separation (expansion) / approach (shrinkage) operations are periodically repeated. As a result, vibration in a new frequency band and vibration noise caused by this vibration may occur, which may impair passenger comfort. is there. In addition, it is possible to provide a reinforcing member that partially connects the upper and lower ends of the opening of the open section formed by the protruding portion in order to suppress the separation / approaching operation, but it is the initial aim by adding the reinforcing member This is not a desirable solution because it reduces the effect of weight reduction.

  An object of the present invention is to provide a front body structure of a vehicle that can reduce indoor vibration noise without increasing the weight of a dash panel.

  The vehicle front body structure according to claim 1 is a vehicle front body structure including a dash panel constituting a front wall portion of a passenger compartment and a dash upper panel connected to an upper end of the dash panel. Has a main body panel portion provided with a basic surface portion, and a protruding portion that protrudes from the basic surface portion toward the front of the vehicle body or the rear of the vehicle body and extends in the vehicle width direction, and the protruding portion is substantially flush with the basic surface portion. It is characterized in that at least one flat portion for dividing the protruding portion in the vehicle width direction is provided.

  In this vehicle front body structure, the dash panel has a protruding portion that protrudes from the basic surface portion toward the front or rear of the vehicle body and extends in the vehicle width direction. The cross section can be configured, and the dash panel can be reduced in weight and rigidity without providing a dash cross member.

According to a second aspect of the present invention, in the first aspect of the invention, the main body panel portion has a rigid portion having rigidity higher than that of the accessory mounting portion or the basic surface portion, and the planar portion is the auxiliary device mounting portion or the rigidity. It is characterized by being formed in the vicinity of the part.
The invention of claim 3 is the invention of claim 1 or claim 1, wherein a floor tunnel extending rearward from the vehicle width direction center lower portion of the dash panel is provided, and the dash panel protrudes in the same direction as the protrusion, and the protrusion It is characterized in that the second projecting portion that connects the floor tunnel is configured.

The invention of claim 4 is the invention of any one of claims 1 to 3, wherein the dash upper panel, a cowl panel connected to the rear end of the dash upper panel and supporting the lower end of the front windshield, A cowl box including a cowl front panel connected to a front end of the dash upper panel is formed, and the projecting portion is disposed in the vicinity of the lower side of the cowl box.
The invention of claim 5 is characterized in that, in the invention of claim 4, the upper end portion of the projecting portion is joined to a connecting portion between the front end of the dash upper panel and the rear end of the cowl front panel.

According to a sixth aspect of the present invention, in the second aspect of the present invention, a floor tunnel extending rearward from the vehicle width direction center lower portion of the dash panel is provided, and the rigid portion protrudes in the same direction as the protruding portion on the dash panel. The projecting portion and the floor tunnel are connected to each other, and the end portion in the vehicle width direction of the rigid portion is connected to the end portion in the vehicle width direction of the flat portion.
A seventh aspect of the invention is characterized in that, in the second or sixth aspect of the invention, the accessory mounting portion is a mounting portion for mounting an air conditioning unit or a brake unit mounted on the dash panel.

  According to the first aspect of the present invention, by forming an open cross section extending in the vehicle width direction by the protrusion formed integrally with the dash panel, the weight reduction and rigidity of the dash panel can be ensured, and the opening formed by the protrusion is formed. By connecting the upper and lower ends of the cross section using a part of the projecting portion, the separation / approaching operation by the upper and lower ends of the open cross section can be suppressed. Therefore, indoor vibration and noise can be reduced without increasing the weight of the dash panel, and passenger comfort in the passenger compartment can be improved.

According to the second aspect of the present invention, since the flat surface portion is continued to the portion other than the basic surface portion, an increase in area due to the addition of the flat surface portion to the basic surface portion that is likely to vibrate can be prevented. -The efficiency of controlling the approaching action can be increased.
According to invention of Claim 3, the vibration of the up-down mode propagated to an up-down direction to a dash panel can be reduced with a floor tunnel, and the separation / approach operation by the upper and lower ends of an open section can be suppressed further.

According to the fourth aspect of the present invention, it is possible to secure the space for arranging the protruding portions without affecting the layout of the auxiliary machine mounting portion or the like.
According to the invention of claim 5, since the dash panel can be triple-bonded to the dash upper panel and the cowl front panel, the dash panel can be increased in rigidity, and the upper end of the open section formed by the protruding portion can be connected to the high-strength connecting portion. Therefore, it is possible to increase the efficiency of suppressing the separation / approaching operation by the upper and lower ends of the open section.

According to the invention of claim 6, since the rigid portion and the flat portion can be simultaneously molded, the productivity can be increased and the rigidity of the flat portion can be increased. Can be high.
According to the seventh aspect of the present invention, the efficiency of suppressing the separation / approaching operation by the upper and lower ends of the open section can be increased by the mounting portion to which the air conditioning unit or the brake unit is attached.

It is the perspective view which looked at the front part body structure of the vehicle concerning Example 1 of the present invention from the cabin back. FIG. 2 is a view corresponding to FIG. 1 in a state in which an auxiliary machine, a steering member, and the like are omitted. It is the front view which looked at the front part body structure in the state where an auxiliary machine, a steering member, etc. were omitted from the back of a vehicle compartment. It is the IV-IV sectional view taken on the line of FIG. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is a perspective view of the vehicle model of a verification experiment. FIG. 4 is a view corresponding to FIG. 3 of a vehicle model corresponding to a comparative example. FIG. 4 is a view corresponding to FIG. 3 of a vehicle model corresponding to a modified example. FIG. 6 is a view corresponding to FIG. 3 of a vehicle model corresponding to another modified example.

  Hereinafter, modes for carrying out the present invention will be described based on examples. In the figure, the arrow F direction is described as the front side of the vehicle body, and the arrow L direction is described as the left side of the vehicle body.

Embodiment 1 of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 to 3, a dash lower panel 1 (dash panel) made of a steel plate that divides an engine room (not shown) and a vehicle compartment behind it at the front of the vehicle body of the vehicle V of this embodiment. The dash upper panel 2 is connected to the upper end of the dash lower panel 1, and the floor panel 3 extending rearward is connected to the lower end of the dash lower panel 1. A pair of left and right front side frames 4 extending in the front-rear direction are connected to the front portion of the dash lower panel 1.

  As shown in FIGS. 1 to 3 and FIGS. 5 to 8, a cowl box 5 extending in the vehicle width direction is disposed on the upper portion of the dash lower panel 1. The cowl box 5 is connected to the dash upper panel 2, a cowl panel 5 a connected to the rear end of the dash upper panel 2 and supporting the lower end of the front windshield (not shown), and the front end of the dash upper panel 2. A closed cross section extending in the vehicle width direction is formed by the cowl front panel 5b.

  The floor panel 3 is configured to expand substantially horizontally from the lower end of the dash lower panel 1 to the rear. A floor tunnel 3a bulging toward the vehicle interior side is formed at a substantially central position in the vehicle width direction of the floor panel 3 so as to extend in the vehicle body front-rear direction, and a front end thereof is connected to a lower center of the dash lower panel 1 in the vehicle width direction. Yes. A pair of left and right floor frames 7 extending in the front-rear direction are provided on the left and right sides of the floor tunnel 3a, and a pair of left and right side sills 6 extending in the front-rear direction are provided on the left and right ends of the floor panel 3. Hinge pillars 8 extending upward are respectively disposed at the front ends of the pair of left and right side sills 6, and a steering member 9 supporting a steering (not shown) is suspended between the pair of left and right hinge pillars 8 in the vehicle width direction. The

Next, the dash lower panel 1 will be described in detail.
As shown in FIGS. 1 to 3, the dash lower panel 1 includes a main body panel portion 11 that extends in a substantially vertical direction at the front portion of the passenger compartment, and an inclined portion 12 that extends in a downwardly downwardly inclined manner from the lower end of the main body panel portion 11. It is composed of an integral front wall of the passenger compartment. The upper end of the dash lower panel 1 is connected to the cowl box 5, and the left and right ends of the dash lower panel 1 are connected to a pair of left and right hinge pillars 8.

  As shown in FIG. 3, the main body panel portion 11 has a flat basic surface portion 11 a that constitutes a reference surface for molding the dash lower panel 1, and includes a brake unit attachment portion 13 a, an air conditioning unit attachment portion 13 b, a vehicle A first projecting portion 14 (projecting portion) extending in the width direction, a second projecting portion 15 (rigid portion) extending in the vertical direction, and the like are integrally formed with the basic surface portion 11a. The brake unit mounting portion 13, the air conditioning unit mounting portion 13b, the first projecting portion 14, and the second projecting portion 15 are simultaneously formed by machining, for example, pressing.

  The brake unit mounting portion 13a is provided in the vicinity of the outer periphery of the rod insertion opening 11b formed in one side (for example, the left side) portion of the main body panel portion 11. The brake unit mounting portion 13a is configured such that a master back and a master cylinder (not shown) of the brake unit 21 and a mounting bracket (not shown) for pivotally supporting the brake pedal 22 can be attached by fastening bolts. ing. The air conditioning unit mounting portion 13b is provided in the vicinity of the outer periphery of the duct insertion opening 11c formed on the other side (for example, the right side) of the main body panel portion 11, and is provided with a blower, a heater (not shown), or the like. Can be attached by fastening bolts.

Next, the 1st protrusion part 14 is demonstrated.
As shown in FIGS. 2 to 4 and 7, the first projecting portion 14 projects from the basic surface portion 11 a to the rear of the vehicle body and is formed between the pair of left and right hinge pillars 8.
The first projecting portion 14 is configured to have a substantially U-shaped cross section so as to form an open cross section opening forward, an upper end portion 14a extending rearward from the upper base end corresponding to the upper end of the opening, and a lower end of the opening A lower end portion 14b extending rearward from the corresponding lower base end portion and a vertical wall portion 14c extending in the vertical direction so as to connect the rear end of the upper end portion 14a and the rear end of the lower end portion 14b are provided. The upper end portion 14a is superposed on a connecting portion in which the front end of the dash upper panel 2 and the rear end of the cowl front panel 5b are overlapped, and is triple bonded by spot welding. In the present embodiment, the vertical width of the first protrusion 14 is set to 3 to 5 times the longitudinal width, more preferably 4 to 5 times.

  As shown in FIG. 3, at least one or more, in this embodiment, three flat portions 16a, 16b, 16c are formed in the first projecting portion 14 in a stepped shape from the vertical wall portion 14c to the front. As shown in FIG. 5 and FIG. 8, these flat portions 16a, 16b, and 16c are planes that are substantially flush with the basic surface portion 11a and connect the upper end portion 14a and the lower end portion 14b of the first projecting portion 14 with the shortest distance. The first protrusions 14 are divided in the vehicle width direction by the flat portions 16a, 16b, and 16c.

Since the left side plane portion 16a is formed at a position near the upper side of the brake unit mounting portion 13a and overlapping in the vehicle width direction when viewed from the front, the brake unit mounting portion is substantially flush with the basic surface portion 11a. It arrange | positions so that it may not connect with the basic surface parts 11a other than the part 13a.
Since the center plane portion 16b is formed so that the right end portion thereof is aligned with the left base end portion of the second protrusion portion 15 in a position near the upper side of the second protrusion portion 15 and in front view, the center plane surface Even if the lower end of the portion 16b is continuous with the basic surface portion 11a, the rigidity of the central plane portion 16b can be increased, and an increase in vibration of the basic surface portion 11a connected to the central plane portion 16b is prevented.
As shown in FIG. 8, the right plane portion 16c is substantially flush with the basic surface portion 11a because it is formed at a position near the upper side of the air conditioning unit attachment portion 13b and in the vehicle width direction when viewed from the front. Nevertheless, it is arranged not to be connected to the basic surface portion 11a other than the air conditioning unit attachment portion 13b.

Next, the 2nd protrusion part 15 is demonstrated.
As shown in FIGS. 2, 3, and 6, the second projecting portion 15 projects from the basic surface portion 11a to the rear of the vehicle body at the center in the vehicle width direction, and between the first projecting portion 14 and the floor tunnel 3a. The rigidity is higher than that of the basic surface portion 11a.
The second projecting portion 15 has a substantially U-shaped cross section so as to form an open cross section that opens forward, a left end portion 15a extending rearward from the left base end corresponding to the left end of the opening, and a right end of the opening. A right wall portion 15b extending rearward from the corresponding right base end portion and a vertical wall portion 15c extending in the vertical direction so as to connect the rear end of the left end portion 15a and the rear end of the left end portion 15b are provided. The front-rear direction width of the second projecting portion 15 is set to the same width as the front-rear direction width of the first projecting portion 14, and the vertical wall portion 15 c is continuous with the vertical wall portion 14 c of the first projecting portion 14. .

Next, the operation and effect of the front vehicle body structure proved by the verification experiment will be described with reference to FIGS.
In this verification experiment, as shown in FIG. 9, vehicle models A1 to A4 in which only the dash lower panel structure is changed and the other structures are shared are prepared, and the front suspension mounting portion B of these vehicle models A1 to A4 is added. The vibration level (dB) of the dash lower panel was evaluated when the vibrator was vibrated at a predetermined frequency in the direction of the arrow.

The specifications of the vehicle models A1 to A4 were set as follows.
As shown in FIG. 10, the model A1 corresponding to the comparative example includes a first protrusion 14 that protrudes rearward and extends in the vehicle width direction, and a second protrusion 15 that protrudes rearward and extends in the vertical direction. A so-called dash lower panel structure in which each plane portion of the present embodiment is omitted is provided.
The model A2 corresponds to the present embodiment. As shown in FIG. 3, the model A2 includes a first projecting portion 14 and a second projecting portion 15, a left plane portion 16a continuous with the brake unit mounting portion 13a, and a second projecting portion 15. A dash lower panel structure is provided that includes a central flat surface portion 16b continuous with the right ridge line and a right flat surface portion 16c continuous with the air conditioning unit mounting portion 13b.
As shown in FIG. 11, a model A3 corresponding to a modification of the present embodiment has a structure including a first projecting portion 14 and a second projecting portion 15, a central plane portion 16b, and a right plane portion 16c, a so-called book. The dash lower panel structure which abbreviate | omitted the left side plane part of the Example is provided.
As shown in FIG. 12, the model A4 corresponding to another modification of the present embodiment includes a first projecting portion 14 and a second projecting portion 15, a left plane portion 16d continuous with the basic surface portion 11a, and a center plane portion 16b. And a dash-lower panel structure in which the left plane part 16a of the so-called embodiment is offset and connected to the left basic surface part 11a of the brake unit mounting part 13a.

The experimental conditions for this verification experiment will be described.
A low frequency α and a high frequency β (α <β) that are likely to be generated in the passenger compartment are set from a frequency band of 50 to 200 Hz, and vibrations of the respective frequencies α and β are set to the front of the models A1 to A4 by a shaker. The vibration level (dB) of the dash lower panel of the models A2 to A4 when the vibration level of the model A1 is set to the reference value (0.00 dB) is detected by inputting to the suspension mounting part B.

The verification results are shown below.
In the models A2 to A4 of this example and each modification, the vibration level of the dash lower panel is reduced as compared with the model A1 as a comparison reference.

Of the verification results of models A2 to A4, model A2 shows the highest vibration suppression effect.
That is, the model A3 suppresses the separation / approaching operation by the upper and lower ends (the upper base end portion and the lower base end portion of the first protrusion) of the open cross section in the right region of the first protrusion 14, but in the left region Since the separation / approaching operation is generated by the upper and lower ends of the open cross section, it is estimated that the vibration suppressing effect is lower than that of the model A2. In the model A4, the left and right and center plane portions 16b, 16c, and 16d suppress the separation / approach operation by the upper and lower ends of the open section, but the left plane portion 16d is connected to the left basic surface portion 11a of the brake unit mounting portion 13a Since the area of the basic surface portion 11a is increased, it is presumed that the effect of suppressing the separation / approaching operation due to the upper and lower ends of the open section is offset by the vibration increase due to the increase in the area of the basic surface portion 11a.

  As described above, according to the front vehicle body structure of the vehicle, the first projecting portion 14 formed integrally with the dash lower panel 1 forms an open cross section extending in the vehicle width direction, thereby reducing the weight of the dash lower panel 1. The upper and lower ends of the open section formed by the first projecting portion 14 can be connected using a part of the first projecting portion 14 to thereby ensure rigidity and the upper and lower ends of the open section formed by the first projecting portion 14. Separation / approaching operation can be suppressed. Therefore, it is possible to reduce indoor vibration noise without increasing the weight of the dash lower panel 1, and to improve the passenger comfort of the passenger.

  The main body panel section 11 has an auxiliary machine mounting section (brake unit mounting section 13a, air conditioning unit mounting section series 13b) or a second projecting section 15 that is stiffer than the basic surface section 11a, and each of the plane sections 16a, 16b, 16c It is formed in the vicinity of the auxiliary equipment mounting portion or the second projecting portion 15. Accordingly, since the flat portions 16a, 16b, and 16c are continued to the portions other than the basic surface portion 11a, an increase in area due to the addition of the flat portions 16a, 16b, and 16c to the basic surface portion 11a that easily vibrates can be prevented. By 16b and 16c, the suppression efficiency of the separation / approaching operation by the upper and lower ends of the open section can be increased.

A floor tunnel 3a extending rearward from the lower center of the dash lower panel 1 in the vehicle width direction is provided, and a second protrusion that protrudes in the same direction as the first protrusion 14 and connects the first protrusion 14 and the floor tunnel 3a to the dash lower panel 1. Since the portion 15 is configured, the vibration of the vertical mode propagated in the vertical direction to the dash lower panel 1 can be reduced by the floor tunnel 3a, and the separation / approach operation by the upper and lower ends of the open section can be further suppressed.
Since the second projecting portion 15 continues from the cowl box 5 to the floor tunnel 3a and continues, the dash lower panel 1 can be divided into left and right to subdivide the basic surface portion 11a, and vibration of the basic surface portion 11a can be further suppressed. .

A cowl comprising a dash upper panel 2, a cowl panel 5a connected to the rear end of the dash upper panel 2 and supporting the lower end of the front windshield, and a cowl front panel 5b connected to the front end of the dash upper panel 2. Since the box 5 is configured and the first projecting portion 14 is disposed in the vicinity of the lower side of the cowl box 5, the arrangement space for the first projecting portion 14 is ensured without affecting the layout of the accessory mounting portion and the like. can do.
Since the dash lower panel 1 can be triple-bonded to the dash upper panel 2 and the cowl front panel 5b, the rigidity of the dash lower panel 1 can be increased, and the upper end of the open section formed by the first projecting portion 14 is bonded to the high-strength connecting portion. Therefore, it is possible to increase the suppression efficiency of the separation / approaching operation by the upper and lower ends of the open section.

  A floor tunnel 3a extending rearward from the center lower portion of the dash lower panel 1 in the vehicle width direction is provided, and the second protrusion 15 is protruded from the dash lower panel 1 in the same direction as the first protrusion 14, and the first protrusion 14 and the floor tunnel 3a Are connected so that the end portion in the vehicle width direction of the second projecting portion 15 is connected to the end portion in the vehicle width direction of the central flat portion 16b. Thereby, since the 2nd protrusion part 15 and the center plane part 16b can be shape | molded simultaneously, productivity can be made high and the rigidity of the center plane part 16b can be made high. Can be high.

  Since the accessory mounting part is a mounting part for mounting the brake unit 13a or the air conditioning unit 13b attached to the dash lower panel 1, the mounting / attaching part for mounting the brake unit 13a or the air conditioning unit 13b allows the separation / approaching operation by the upper and lower ends of the open section. The suppression efficiency can be increased.

Next, a modification in which the above embodiment is partially changed will be described.
1) In the above-described embodiment, the example in which the first protrusion protrudes toward the rear of the vehicle body has been described. However, it is also possible to form the first protrusion that protrudes toward the front of the vehicle body. Moreover, although the example which formed the protrusion part in the substantially U-shaped cross section was demonstrated, what is necessary is just to be able to increase the rigidity of a dash lower panel at least, and cross-sectional shapes, such as C shape and a wedge shape, can be set arbitrarily.

2) In the above-described embodiment, the example in which the rigid portion is configured by the second projecting portion has been described. However, at least the rigid portion may be higher in rigidity than the basic surface portion, and may be configured by increasing the plate thickness or adding reinforcement. It is also possible to do. Further, a reinforcing plate may be separately provided in the accessory mounting part, and the accessory mounting part and the rigid part may be combined.

3] In the above-described embodiment, the brake unit mounting portion and the air conditioning unit mounting portion have been described as examples of the auxiliary device mounting portion. However, the present invention is not limited to these, and any auxiliary device mounting portion has the same effect. Can do.
4) In addition, those skilled in the art can implement the present invention in various forms added with various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention provides a vehicle front body structure including a dash panel constituting a front wall portion of a passenger compartment and a dash upper panel connected to an upper end of the dash panel, and a protrusion extending in the vehicle width direction is provided on the dash panel. By integrally forming and connecting the upper and lower ends of the opening using a part of the projecting portion, it is possible to reduce indoor vibration noise without increasing the weight of the dash panel.

DESCRIPTION OF SYMBOLS 1 Dash lower panel 2 Dash upper panel 3a Floor tunnel 5 Cowl box 5a Cowl panel 5b Cowl front panel 11 Main body panel part 11a Basic surface part 13a Brake unit attachment part 13b Air conditioning unit attachment part 14 1st protrusion part 15 2nd protrusion part 16a Left side plane Part 16b center plane part 16c right side plane part V vehicle

Claims (7)

In the vehicle front body structure including a dash panel that forms a front wall portion of the passenger compartment and a dash upper panel that is connected to the upper end of the dash panel,
The dash panel has a main body panel portion provided with a basic surface portion, and a protruding portion that protrudes from the basic surface portion toward the front or rear of the vehicle body and extends in the vehicle width direction,
A front vehicle body structure for a vehicle, wherein the projecting portion is provided with at least one flat portion that is substantially flush with the basic surface portion and that divides the projecting portion in the vehicle width direction. The main body panel portion has a rigid portion that is higher in rigidity than the accessory mounting portion or the basic surface portion,
The front body structure of a vehicle according to claim 1, wherein the flat portion is formed in a vicinity of the accessory mounting portion or the rigid portion. A floor tunnel extending rearward from the center bottom in the vehicle width direction of the dash panel is provided,
3. The front body structure of a vehicle according to claim 1, wherein the dash panel includes a second protrusion that protrudes in the same direction as the protrusion and connects the protrusion and the floor tunnel. 4. A cowl box comprising the dash upper panel, a cowl panel connected to the rear end of the dash upper panel and supporting the lower end of the front windshield, and a cowl front panel connected to the front end of the dash upper panel And
The vehicle front body structure according to any one of claims 1 to 3, wherein the projecting portion is disposed at a position near the lower side of the cowl box.   The front body structure of a vehicle according to claim 4, wherein an upper end portion of the projecting portion is joined to a connecting portion between a front end of the dash upper panel and a rear end of the cowl front panel. A floor tunnel extending rearward from the center bottom in the vehicle width direction of the dash panel is provided,
The rigid portion is formed on the dash panel so as to protrude in the same direction as the protruding portion, and connects the protruding portion and the floor tunnel,
The vehicle front body structure according to claim 2, wherein an end portion in the vehicle width direction of the rigid portion is configured to be continuous with an end portion in the vehicle width direction of the flat portion. The front body structure of a vehicle according to claim 2 or 6, wherein the accessory mounting portion is a mounting portion for mounting an air conditioning unit or a brake unit mounted on the dash panel.