JP2007030627A - Front part car body structure for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front part car body structure for an automobile, capable of transmitting a load from ahead to be dispersed in a wide range while restricting increase of weight by effectively utilizing existing members. <P>SOLUTION: This device is provided with an instrument panel to compose a front wall part of a cabin, an instrument panel cross member 10 extended in the car width direction to be jointed with the instrument panel, and a booster installation reinforcement 19 jointed with the instrument panel 3 to reinforce an installation part of a brake booster to the instrument panel 3. A car width direction center part of the instrument panel cross member 10 is jointed with a front end part of a floor tunnel part 12 extended along the vehicle length direction. The booster installation reinforcement 19 comprises a reinforcement body 20, and a reinforcing arm part 21 extended from the reinforcement body 20 inward of the car width direction to be jointed with the car width direction center part of the instrument panel cross member 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a front body structure of an automobile including a dash panel that constitutes a front wall portion of a passenger compartment. More specifically, the present invention relates to an auxiliary body that reinforces the mounting portion when a vehicle auxiliary machine such as a brake booster is attached to the dash panel. The present invention relates to a front body structure of an automobile provided with a machine reinforcement.

Conventionally, as shown in Patent Document 1, a dash panel is disposed between a cowl panel and a floor panel as a partition for partitioning a vehicle compartment and an engine compartment of an automobile. A dash cross member is joined to the front or rear surface of the dash panel along the vehicle width direction, and the strength of the dash panel is improved by the dash cross member. In addition, various vehicular auxiliary machines are attached to the dash panel, for example, a brake booster that enhances the pedal force input to the brake pedal. In order to increase the support rigidity of the brake booster, a booster attachment reinforcement may be joined to the brake booster attachment portion of the dash panel.
JP 2000-95148 A (see FIG. 8)

  By the way, in this kind of automobile, in order to avoid the local application of a load when an impact force or the like is input and to relax the impact force or the like, the load input from the front is dispersed. Therefore, it is desired to transmit to the vehicle rear side, and various devices have been conventionally applied to the front body structure of an automobile.

  Here, in the front body structure of the automobile shown in Patent Document 1, the load input to the dash panel is transmitted to the left and right suspension upper brackets via the dash cross member and the reinforcement for mounting the booster. Although the input load is configured to be distributed and transmitted, further load distribution is required for buffering.

  In particular, in the front vehicle body structure described in Patent Document 1, it is conceivable to further expand the reinforcement for mounting the booster and connect this reinforcement to another strength member. The disadvantage is that the weight of the force increases significantly.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is a front body of an automobile capable of distributing and transmitting a load from the front over a wide range while effectively using existing members and suppressing an increase in weight. Its purpose is to provide a structure.

  In order to solve the above problems, a front body structure of an automobile according to the present invention includes a dash panel that forms a front wall portion of a passenger compartment, a dash cross member that extends in the vehicle width direction and is joined to the dash panel, A floor tunnel portion that is joined to the dash panel and that reinforces a mounting portion of the vehicular auxiliary device to the dash panel, and a center portion in the vehicle width direction of the dash cross member extends along the vehicle front-rear direction. The auxiliary reinforcement is provided with a rain main body and a reinforcing arm portion extending from the rain main body inward in the vehicle width direction and joined to a center portion in the vehicle width direction of the dash cross member. It is a feature.

  According to the present invention, the auxiliary component reinforcement has a rain main body and a reinforcing arm portion that extends from the rain main body inward in the vehicle width direction and is joined to the center portion in the vehicle width direction of the dash cross member. The load input to the auxiliary machine reinforcement is transmitted not only through the rain main body but also through the reinforcing arm portion, whereby the input load can be efficiently dispersed. In addition, it effectively utilizes the accessory reinforcement and does not simply enlarge the rain body, but rather the load is transmitted through the reinforcement arm that extends from the rain body, thus increasing the weight as much as possible. Can be suppressed. Further, since the center portion in the vehicle width direction of the dash cross member to which the reinforcing arm portion is joined is joined to the front end portion of the floor tunnel portion extending along the vehicle longitudinal direction, the load transmitted through the reinforcing arm portion is It can be transmitted to the rear side of the vehicle through the floor tunnel portion, and the load input to the auxiliary machinery reinforcement can be dispersed in a wider range.

  The vehicular auxiliary machine is not particularly limited, but the vehicular auxiliary machine is preferably a brake booster that generates a braking force by increasing an operating force of a brake pedal. ).

  That is, a booster mounting reinforcement may be used for mounting the brake booster, and the front vehicle body structure can be configured by effectively using the booster mounting reinforcement which is the strength member.

  Both ends of the dash cross member in the vehicle width direction may be joined to a suspension tower or the like, but from the viewpoint of distributing the input load to the vehicle rear side, a pair of left and right front side frames extending in the vehicle front-rear direction. In this case, it is preferable that the lower end portion of the rain main body is bonded to the bonded portion or the periphery thereof (Claim 3).

  If comprised in this way, the load input into the auxiliary | assistant machinery reinforcement can be efficiently disperse | distributed and transmitted to the vehicle rear side through a rain main body and a reinforcement arm part.

  The upper end portion of the rain main body is not particularly limited in its specific joining location. For example, the upper end portion of the rain main body may be joined to a predetermined location on the surface of the dash panel. It is preferable to be joined to a cowl panel extending in the vehicle width direction above the member, and in this case, the reinforcing arm portion is arranged in a bracing manner between the rain main body and the dash cross member. Preferred (claim 4).

  If comprised in this way, the load input into the rain main body will be transmitted to a cowl panel through a rain main body, and can be disperse | distributed and transmitted to the vehicle body upper part through this cowl panel. That is, the load can be dispersed in a wider range.

  By the way, since the lower part of the vehicle body is usually configured to be higher in rigidity than the upper part of the vehicle body, the rigidity is increased by arranging the reinforcing arm portion in a bracing manner between the dash cross member and the rain body. The load transmitted to the lower part of the vehicle body can be increased, and the load input to the auxiliary machinery reinforcement can be dispersed widely and appropriately.

  The reinforcing arm portion may be formed in a plate shape and overlap-bonded to the dash panel, but the reinforcing arm portion bulges in the vehicle front-rear direction and forms a closed cross section with the dash panel. Preferably, it is configured (claim 5).

  If comprised in this way, the rigidity of a reinforcement arm part can be improved and a load can be transmitted more efficiently.

  Here, a tunnel reinforcement forming a closed section extending in the vehicle longitudinal direction is joined to the front tunnel portion together with the floor tunnel portion, and the front end portion of the tunnel reinforcement is joined to the dash panel. (Claim 6).

  If comprised in this way, the rigidity of a front tunnel part can be improved by tunnel reinforcement, and even if the load input into a front tunnel part increases by this, a load can be transmitted more reliably and appropriately. it can.

  In the present invention, it is preferable that an operation pedal for operating the vehicle is attached across the rain main body and the reinforcing arm portion of the auxiliary reinforcement.

  That is, it is preferable that various operation pedals such as a clutch pedal, an accelerator pedal, and a foot type parking brake pedal are mounted across the rain body and the reinforcing arm portion. Therefore, the support rigidity of the operation pedal can be improved.

  According to the vehicle front body structure of the present invention, the load inputted from the front can be distributed and transmitted over a wide range while effectively suppressing the increase in the vehicle weight by effectively using the auxiliary reinforcement. There is an advantage that impact force and the like input to the vehicle body can be effectively absorbed.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a front body structure of a vehicle according to an embodiment of the present invention from the rear side, and FIG. 2 is a perspective view showing the front body structure from the front side. FIG. 3 is a rear view of the front body structure.

  As shown in each figure, the front vehicle body includes a brake that generates a braking force by increasing the operating force of the dash panel 3 constituting the front wall portion of the passenger compartment and the brake pedal 5 (see FIG. 4). A booster 4 (corresponding to an example of a vehicle auxiliary machine) is provided. The dash panel 3 is a plate-like body formed so as to cover the front portion of the passenger compartment, and is formed from a steel plate.

  As shown in FIG. 4, the dash panel 3 has an inclined wall portion 7 that extends obliquely upward from the front edge of the floor panel 6 and an upright wall portion 8 that stands up in a substantially vertical direction from the upper end of the inclined wall portion. The upper end portion of the upright wall portion 8 is bent substantially horizontally and joined to the lower surface of the cowl panel 9 extending in the vehicle width direction. A dash cross member 10 extending in the vehicle width direction is attached below the cowl panel 9 to the front surface of the standing wall 8, in other words, the lower end of the wall of the standing wall 8 on the engine compartment side. The cowl panel 9 is joined to the A pillar at both ends in the vehicle width direction.

  As shown in FIG. 4, the dash cross member 10 is formed in a substantially hat shape in cross-sectional view by bending a steel plate, and the flange portion 10 a at the opening edge thereof is joined to the front lower end portion of the standing wall portion 8. A closed cross section C extending in the vehicle width direction is formed together with the front surface of the standing wall portion 8. Both ends of the dash cross member 10 in the vehicle width direction are joined to the front ends of the kick-up portions 11a in the pair of left and right front side frames 11 extending in the vehicle front-rear direction as clearly shown in FIG. That is, the dash cross member 10 is joined to strength members extending in the vehicle front-rear direction at both ends thereof.

  As shown in FIGS. 3 and 5, the center portion in the vehicle width direction of the dash cross member 10 is joined to the upper wall of the floor tunnel portion 12 extending in the front-rear direction of the vehicle body along the center portion in the vehicle width direction. Yes. Specifically, the upper surface wall of the floor tunnel portion 12 constitutes a boundary portion between the inclined wall portion 12a that is inclined forwardly upward and the upright wall portion 8 that extends upward from the tip of the inclined wall portion 12a. And the front surface of the standing boundary wall portion 12b is joined to the lower flange portion 10a of the dash cross member 10. In addition, a tunnel reinforcement 13 is disposed outside the floor tunnel portion 12 and forms a closed section C2 that extends in the vehicle front-rear direction together with the upper portion of the floor tunnel portion 12.

  As shown in FIGS. 1 and 3, the tunnel reinforcement 13 is formed in a substantially M shape in cross section, and the inner surface of the side wall 13 a is joined to the upper portion of the outer surface of the floor tunnel portion 12 by spot welding or the like. The ceiling central plane portion 13b is superposed on the upper surface of the floor tunnel portion 12 and joined by spot welding or the like. As shown in FIG. 5, the tunnel reinforcement 13 has its front end bent approximately upward and joined to the standing boundary wall 12 b of the floor tunnel 12, in other words, the rear surface of the lower end of the standing wall 8. ing.

  That is, the dash cross member 10 or the tunnel reinforcement 13 is joined to the front and rear surfaces of the standing boundary wall portion 12b, which is the boundary portion between the floor tunnel portion 12 and the standing wall portion 8. In the present embodiment, the dash panel 3 and the floor panel 6 are formed separately, but the front end portion of the floor tunnel portion 12 is formed integrally with the dash panel 3.

  Further, as shown in FIG. 2, openings 14 to 17 having various shapes and sizes are provided through the standing wall 8 of the dash panel 3. These openings 14 to 17 are used to insert a part of various vehicle auxiliary machines and various cables connected to the auxiliary machines.

  Among these openings 14 to 17, as shown in FIG. 4, the brake booster 4 is provided in the opening 14 disposed on the driver's seat side (the right side in the vehicle width direction in the present embodiment) in the vehicle width direction. The rear end protrusion 4b including the valve operating rod 4a is mounted in a state of being inserted. A plurality of (four in the illustrated example) screw insertion holes 18 are formed around the opening 14, and the screw insertion holes 18 project from the back surface of the power cylinder 4 c of the brake booster 4. A stud bolt 4d is inserted.

  On the rear surface side of the dash panel 3 to which the brake booster 4 is mounted, a booster attachment reinforcement 19 for improving the support rigidity of the brake booster 4 by the dash panel 3 (corresponding to an example of an auxiliary machine reinforcement) ) Are joined to the rear surface of the dash panel 3 by spot welding or the like. As shown in FIG. 6, the booster mounting reinforcement 19 has an outer side edge portion extending in the vehicle width direction, that is, a side edge portion on the floor tunnel portion 12 side, extending to the floor tunnel portion 12 side. Further, it has a shape provided with a notch 19a extending upward from the lower end of the extended base end portion.

  Specifically, the booster attachment reinforcement 19 includes a rain main body 20 formed in a substantially rectangular shape, and a reinforcing arm portion 21 extending obliquely downward from the upper side edge of the rain main body 20 in the vehicle width direction. It is formed integrally by pressing a single steel plate.

  The rain main body 20 is formed so that most of the region abuts against the rear surface of the dash panel 3 and part of the region bulges rearward to be separated from the rear surface of the dash panel 3, thereby improving rigidity. . As shown in FIG. 4, the rain main body 20 has an upper end joined to the rear surface of the cowl panel 9 by spot welding or the like, and a lower end joined to the upper flange 10 a of the dash cross member 10. It is joined to the rear surface of the panel 3 by spot welding or the like. That is, the lower end portion of the rain main body 20 is joined to the dash cross member 10 via the dash panel 3. Further, the lower end portion of the rain body 20 is joined by spot welding or the like across the dash cross member 10 and the front side frame 11 via the dash panel 3 in the vehicle width direction. Therefore, the lower end portion of the rain main body 20 is also joined to the joining portion between the dash cross member 10 and the front side frame 11 via the dash panel 3.

  A rain through hole 22 that communicates with the opening 14 of the dash panel 3 is provided in the center of the rain main body 20, and a screw insertion that communicates with the screw insertion hole 18 around the rain through hole 22. A hole 23 is provided therethrough. The rain through hole 22 is for inserting the rear end protrusion 4b of the brake booster 4, and the screw insertion hole 23 is for inserting the stud bolt 4d of the brake booster 4. Therefore, the brake booster 4 allows the rear end protrusion 4b to be inserted into the opening 14 and the rain through hole 22, and the stud bolt 4d to be inserted into the screw insertion holes 18 and 23, and the nut 24 is screwed to the stud bolt 4d. By doing so, it is mounted on the front surface of the dash panel 3.

  Further, as shown in FIGS. 4 and 6, a pair of left and right pedal mounting portions 26 for mounting the pedal bracket 25 of the brake pedal 5 is provided on the upper portion of the rain body 20. A stud bolt 26a is erected on the pedal attachment portion 26, and the brake pedal 5 is attached by attaching a pedal bracket 25 to the stud bolt 26a. The lever 5a of the brake pedal 5 is configured such that a valve operating rod 4a is pivotally supported at an intermediate portion so that the operating force of the brake pedal 5 is input to the brake booster 4.

  On the other hand, as clearly shown in FIG. 3, the reinforcing arm portion 21 is curved and formed in an upwardly convex arch shape in the rear view, and the lower end portion is joined to the center portion in the vehicle width direction of the dash cross member 10. Accordingly, the reinforcing arm portion 21 is disposed in a bracing manner between the rain main body 20 and the dash cross member 10, and a notch portion 19 a constituted by the reinforcing arm portion 21 and the rain main body 20 is formed on the dash panel 3. It arrange | positions so that the opening part 15 may be connected.

  Specifically, the lower end portion of the reinforcing arm portion 21 is the center portion in the vehicle width direction of the dash cross member 10 and is disengaged outward in the vehicle width direction from the joint portion with the standing boundary wall portion 12b of the floor tunnel portion 12. As shown in FIG. 8, it is joined to the portion, that is, the portion near the rain main body 20 by spot welding or the like via the dash panel 3. As described above, the lower end portion of the reinforcing arm portion 21 is joined to the center portion in the vehicle width direction of the dash cross member 10 via the dash panel 3, and the center portion in the vehicle width direction of the dash cross member 10 is described above. As described above, the front end portion (the standing boundary wall portion 12b) of the floor tunnel portion 12 is joined, so that the load transmitted through the reinforcing arm portion 21 passes through the center portion in the vehicle width direction of the dash cross member 10 and the tunnel tunnel portion 12 and the tunnel rain. It is transmitted to the force 13.

  The reinforcing arm portion 21 is formed in a bead shape with a central region 27 in the width direction bulging rearward, and forms a closed section C3 together with the rear surface of the dash panel 3 as shown in FIG. The rigidity of the reinforcing arm portion 21 is improved by the closed cross section C3, and a load can be efficiently transmitted through the reinforcing arm portion 21.

  A clutch pedal unit 28 is attached to the booster attachment reinforcement 19 across the reinforcement arm portion 21 and the rain main body 20. That is, the periphery of the cutout portion 19a of the reinforcement 19 for mounting the booster is formed relatively flat and bulges backward to form a contact portion 29. A stud bolt for pedal mounting is formed on the contact portion 29. 30 is erected. As shown in FIG. 1, a mounting bracket 31 of the clutch pedal unit 28 is supported on the stud bolt 30 and screwed with a nut (not shown), whereby the clutch pedal unit 28 is attached to the reinforcement 19 for mounting the booster. Is attached. A wire (not shown) extending from the clutch pedal unit 28 is drawn into the engine compartment through the notch 19a of the booster attachment reinforcement 19 and the opening 15 of the dash panel 3.

  4 and 8 between the side edge portion of the rain main body 20 on the floor tunnel portion 12 side and the reinforcing arm portion 21 in the closed cross section C of the dash cross member 10 in the vehicle width direction. Thus, the auxiliary reinforcement 35 for improving the strength of the dash cross member 10 is provided. The auxiliary reinforcement 35 is formed in a substantially U shape in a sectional view, and the outer surfaces of the left and right end portions in the vehicle width direction are joined to the inner surface of the dash cross member 10.

  According to the front body structure of the automobile configured as described above, the booster mounting reinforcement 19 extends from the rain main body 20 and the rain main body 20 to the floor tunnel portion 12 side to the vehicle width of the dash cross member 10. Since the central portion of the dash cross member 10 to which the reinforcing arm portion 21 is joined is joined to the front end portion of the floor tunnel portion 12, the reinforcing arm portion 21 is joined to the center portion in the direction. When a load is input from the front side of the automobile and a load is input to the rain main body 20 through the reinforcement 19 for mounting the booster, the load is also distributed to the floor tunnel portion 12 through the reinforcing arm portion 21.

  That is, when a load is input to the rain main body 20 from the front side of the automobile, the load is not only distributed and transmitted from the rain main body 20 to the cowl panel 9, the dash cross member 10, and the front side frame 11, but is also reinforced. A load is distributed and transmitted through the arm portion 21 to the center portion of the dash cross member 10 in the vehicle width direction, the floor tunnel portion 12 and the tunnel reinforcement 13, thereby efficiently dispersing the input load and transferring energy over a wide range of the vehicle body. It can absorb and relieve shock.

  In addition, when the input load is dispersed, the booster attachment reinforcement 19 which is a strength member for improving the support rigidity of the brake booster 4 is effectively used, and the booster attachment reinforcement in the conventional structure is improved. Thus, instead of simply enlarging the reinforcement, the load is transmitted through the reinforcing arm portion 21 extending in a brace form from the upper side edge of the rain body 20. Can be suppressed as much as possible.

  By the way, since the lower part of the vehicle body is usually configured to have higher rigidity than the upper part of the vehicle body, the reinforcing arm portion 21 is disposed between the dash cross member 10 and the rain body 20 in a bracing manner. The load transmitted to the lower part of the vehicle body having high rigidity can be increased, and the load input to the reinforcement 19 for mounting the booster can be distributed widely and appropriately.

  The vehicle body front structure described above is an embodiment of the structure according to the present invention, and the specific configuration of the structure can be appropriately changed without departing from the gist of the present invention. A modification will be described below.

  (1) In the above embodiment, the auxiliary arm portion 21 extends from the upper side edge portion of the rain body 20 toward the floor tunnel portion 12 side, and is arranged in a bracing manner between the rain body 20 and the dash cross member 10. The reinforcing arm portion 21 is not particularly limited in its specific shape as long as a part of the side edge portion of the rain main body 20 extends toward the floor tunnel portion 12 side. Absent.

  For example, the reinforcing arm portion may be formed to extend from the lower side edge portion of the rectangular rain body 20 along the dash cross member 10 toward the floor tunnel portion 12 side in the vehicle width direction. Alternatively, the side edge of the rectangular rain main body 20 extends in a triangular shape toward the floor tunnel 12, and a large opening that is slightly larger than the opening 15 of the dash panel 3 is provided at the center of the extension. You may do it. Even if comprised in this way, the load input into the reinforcement 19 for booster attachment can be efficiently disperse | distributed and transmitted to the strength member extended in the vehicle front-back direction, suppressing the increase in a weight.

  (2) Moreover, in the said embodiment, although the lower end part of the reinforcement arm part 21 is joined to the position which remove | deviated to the rain main body 20 side from the part to which the front-end part of the floor tunnel part 12 is joined, this reinforcement arm The lower end portion of the portion 21 may be directly joined to the front end portion of the floor tunnel portion 12. However, when the lower end portion of the reinforcing arm portion 21 is joined to the center portion of the dash cross member 10 that is removed from the portion where the front end portion of the floor tunnel portion 12 is joined as in the above embodiment, the dash cross member is joined. 10, the load can be transmitted to the front side frame on the opposite side (opposite to the rain main body 20 side with respect to the floor tunnel portion 12), and the input load can be dispersed in a wider range.

  (3) In the above-described embodiment, both end portions in the vehicle width direction of the dash cross member 10 are joined to the front side frame 11, but both end portions may be joined to the suspension tower. However, in order to efficiently distribute and transmit the input load to the strength member extending in the longitudinal direction of the vehicle, both ends in the vehicle width direction of the dash cross member 10 are joined to the front side frame 11 as in the above embodiment. preferable.

  (4) In the above embodiment, the upper end of the rain main body 20 is joined to the cowl panel 9, but it may be joined to the rear upper end of the dash panel 3. However, the upper end of the rain main body 20 is joined to the cowl panel 9 so that the load can be distributed to the vehicle body upper structure through the cowl panel extending in the vehicle width direction and the A pillar to which the cowl panel is joined. .

  (5) Although the reinforcing arm portion 21 may be formed as a flat plate, a part of the reinforcing arm portion 21 bulges rearward of the vehicle and forms a closed section C3 together with the dash panel 3 as in the above embodiment. Is preferred. If it does in this way, the intensity | strength of the reinforcement arm part 21 can be improved, suppressing the increase in a weight.

  (6) The pedal attached between the rain main body 20 and the reinforcing arm portion 21 of the reinforcement 19 for booster attachment may be a foot-type parking brake pedal in addition to the clutch pedal. May be provided on the left side of the vehicle.

It is a perspective view which shows the front vehicle body structure of the motor vehicle based on one Embodiment of this invention from the back side. It is a perspective view which shows the structure from the front side. It is a rear view which shows the structure. 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 a perspective view which shows the reinforcement for booster attachment. 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.

Explanation of symbols

3 Dash panel 4 Brake booster (vehicle accessory)
5 Brake pedal (pedal)
9 Cowl Panel 10 Dash Cross Member 11 Front Side Frame 12 Floor Tunnel 13 Tunnel Reinforcement 19 Booster Mounting Reinforcement 20 Rain Body 21 Reinforcement Arm 27 Central Region 28 Clutch Pedal Unit (Operating Pedal)
C Closed section C2 Closed section C3 Closed section

Claims (7)

A dash panel that forms the front wall of the passenger compartment, a dash cross member that extends in the vehicle width direction and is joined to the dash panel, and a mounting portion of the vehicle auxiliary machine that is joined to the dash panel and is attached to the dash panel With auxiliary equipment reinforcement,
The center portion in the vehicle width direction of the dash cross member is joined to the front end portion of the floor tunnel portion extending along the vehicle longitudinal direction, and the auxiliary component reinforcement extends from the rain body and the rain body inward in the vehicle width direction. A vehicle body structure for a front part of an automobile having a reinforcing arm part joined to a center part in the vehicle width direction of the dash cross member.   2. The front body structure of an automobile according to claim 1, wherein the vehicular accessory is a brake booster that generates a braking force by increasing an operating force of a brake pedal.   Both ends of the dash cross member in the vehicle width direction are joined to a pair of left and right front side frames extending in the vehicle front-rear direction, and the lower end of the rain main body is joined to the joined portion or the periphery thereof. The front body structure of an automobile according to claim 1 or 2.   The upper end portion of the rain main body is joined to a cowl panel extending in the vehicle width direction above the dash cross member, and the reinforcing arm portion is disposed in a bracing manner between the rain main body and the dash cross member. The front body structure of an automobile according to any one of claims 1 to 3.   5. The front of an automobile according to claim 1, wherein the reinforcing arm portion is configured to bulge in a vehicle front-rear direction and form a closed cross-section together with a dash panel. Body structure.   A tunnel reinforcement forming a closed cross section extending in the vehicle longitudinal direction is joined to the floor tunnel portion together with the floor tunnel portion, and the front end portion of the tunnel reinforcement is joined to a dash panel. The front body structure of an automobile according to any one of claims 1 to 5.   The operation pedal for operating the vehicle straddling the rain main body and the reinforcing arm portion of the auxiliary machine reinforcement is attached. Front car body structure of an automobile.

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