JP4367190B2 - Front body structure of automobile - Google Patents

Description

  The present invention relates to a front body structure of a vehicle including a bumper reinforcement that is removably attached to front end portions of front side frames disposed on the left and right sides of a vehicle body and connects front end portions of both front side frames. Is.

Conventionally, for example, as shown in Patent Document 1 below, protrusions protruding forward are formed in the vicinity of the left vehicle body fastening portion in the left wall portion of the radiator holding portion and in the vicinity of the right vehicle body fastening portion in the right wall portion. When the bumper reinforcement placed in front of the protrusion moves backward due to the frontal collision of the automobile, when the load more than a predetermined level acts on the protrusion from the front side, the radiator holding part and the left and right body are fastened. Of a vehicle that is configured so as to be separated from the part, and even when the radiator shroud is broken at the time of a frontal collision of the automobile, the radiator held in the radiator holding part is prevented as much as possible to improve the repairability. A front body structure is known.
JP 2002-240744 A

  As described above, when the bumper reinforcement is retracted at the time of the frontal collision of the vehicle, the radiator holding part provided on the radiator shroud is separated from the left and right vehicle body fastening parts. It can suppress acting on a radiator. Also, in the event of a frontal collision of an automobile, damage to the front side frame can be suppressed by absorbing the impact load by crushing the crash tube that connects the left and right ends of the bumper reinforcement to the front end of the front side frame. Since this is possible, there is an advantage that the cost required for repair work can be reduced.

However, as shown in FIG. 7, the mounting flange for the bumper reinforcement 60 provided at the front end portion of the front side frame 61 in the case of an oblique collision of the vehicle that receives the load F from the diagonally forward direction to the bumper reinforcement 60, for example. by moment load corresponding to the load F at the time of the collision is applied to concentrate on parts 62 and 63, it can not be avoided that such the mounting flange 62 and 63 is bent and deformed. For this reason, not only the bumper reinforcement 60 but also the front side frame 61 has to be repaired, and there is a problem that a large-scale repair work is required and the cost increases.

  The present invention has been made in view of the above points, and a front body of an automobile that can effectively prevent the front end portion of the front side frame from being deformed with a simple configuration when the automobile collides. Provide structure.

  The invention according to claim 1 is a front view of an automobile including a bumper reinforcement that is detachably attached to front end portions of front side frames disposed on the left and right sides of a vehicle body and connects front end portions of both front side frames. In the vehicle body structure, the bumper reinforcement is provided with a rain main body portion extending in the vehicle width direction, and mounting bracket portions fixed to the upper wall surface and the bottom wall surface of the front side frame by mounting bolts at both left and right ends thereof, respectively. And a stepped portion facing at least one of the front upper end portion or the front lower end portion of the front side frame is provided between the mounting bracket portion and the rain main body portion.

  According to a second aspect of the present invention, in the front body structure of the automobile according to the first aspect, the front side frame is constituted by a vehicle body outer side member and a vehicle body inner side member, and the vehicle body outer side member. In addition, at least one of the joining flange portions provided respectively on the upper and lower sides of the vehicle body inner side member extends substantially horizontally along the upper wall surface or the bottom wall surface of the front side frame.

The invention according to claim 3, in front body structure for an automobile according to the claim 2, along the front end inner surface of the outside of the vehicle body-side member or the vehicle body inner side member constituting the front side frame substantially U The front end portion reinforcing member is disposed, and the front end portion reinforcing member is provided with a nut portion to which a mounting bolt for bumper reinforcement is screwed.

  According to a fourth aspect of the present invention, in the front body structure of an automobile according to any one of the first to third aspects, the rain main body portion, the mounting bracket portion, and the step portion of the bumper reinforcement are provided as a single piece. In addition to being integrally formed with a plate material, a bracket reinforcing member is disposed along the inner surface of the mounting bracket portion and the step portion of the bumper reinforcement.

  According to a fifth aspect of the present invention, in the front body structure of the automobile according to the fourth aspect, the front surface of the bracket reinforcing member disposed along the inner surface of the mounting bracket portion and the step portion of the bumper reinforcement and the rain A reinforcing rib member is disposed between the back surface of the main body portion.

  According to a sixth aspect of the present invention, in the front body structure of the automobile according to the fifth aspect, the bracket reinforcing member is provided with a pair of upper and lower radiator shroud mounting portions protruding inward of the vehicle body.

  According to the first aspect of the present invention, when a load acts in the direction of pressing the bumper reinforcement backward, such as during a car collision, the bumper reinforcement is provided between the mounting bracket portion and the rain main body portion. The stepped portion is in contact with at least one of the front upper end or front lower end of the front side frame, and the mounting bracket portion of the bumper reinforcement is fixed to the abutting portion and the mounting bolt by the front side frame. The load at the time of the collision is dispersed and supported on the upper wall surface and the bottom wall surface. Therefore, there is an advantage that damage to the front side frame can be effectively suppressed with a simple configuration at the time of an oblique collision of an automobile, and the occurrence of a situation where the repair is necessary can be prevented.

  According to the second aspect of the present invention, the mounting bracket portion of the bumper reinforcement is secured by the upper wall surface or the bottom wall surface of the front side frame and the joining flange portion extending substantially horizontally along these. Therefore, the mounting bracket portion of the bumper reinforcement can be easily and properly attached to the front end portion of the front side frame by the mounting bolt.

  According to the invention according to claim 3, in a state where the substantially U-shaped front end portion reinforcing member is disposed along the inner surface of the front end portion of the vehicle body outer side member or the vehicle body inner side member constituting the front side frame, A front side frame having a nut portion into which a mounting bolt of the mounting bracket portion is screwed can be easily formed by welding the joint flange portions of the vehicle body outer side member and the vehicle body inner side member to each other. In addition, there is an advantage that the mounting state of the bumper reinforcement can be stably maintained by effectively reinforcing the front end portion of the front side frame with the front end portion reinforcing member.

  According to the invention according to claim 4, it is possible to easily and inexpensively manufacture a bumper reinforcement having a light weight and a high rigidity by processing a single plate material, and mounting bracket portions and steps of the bumper reinforcement. The portion can be effectively reinforced by the bracket reinforcing member, and the collision load of the automobile acting on this portion can be stably supported.

  According to the invention which concerns on Claim 5, according to the load which acts on the direction which presses a bumper reinforcement to the back side at the time of the collision of a motor vehicle, etc., between the front surface of the said bracket reinforcement member and the back surface of a rain main-body part. By compressing and deforming the reinforcing rib member disposed in the frame, there is an advantage that the collision load can be effectively absorbed and damage to the front side frame can be more effectively suppressed.

  According to the invention of claim 6, the radiator shroud is provided on the radiator shroud mounting portion that protrudes up and down across the rain main body portion of the bumper reinforcement and projects inward of the mounting bracket portion. By attaching, the radiator shroud can be effectively prevented from tilting back and forth, and the radiator shroud can be stably supported.

  FIG. 1 shows an embodiment of a front body structure of an automobile according to the present invention. A pair of left and right front side frames 1 extending in the front-rear direction of the vehicle body and a bumper that is detachably attached to the front end portions of the front side frames 1 and connects the front end portions of the front side frames 1 to the front vehicle body. It has a reinforcement 2 and a radiator shroud 3 that is detachably attached to the front side frame 1 and the bumper reinforcement 2. A bumper face (not shown) is arranged on the front side of the bumper reinforcement 2. It is set up.

  2 to 4, the bumper reinforcement 2 has a rain main body portion 4 extending in the vehicle width direction and a pair of upper and lower mounting bracket portions 5 and 6 provided at both left and right ends thereof. Stepped portions 7 and 8 are provided between the mounting bracket portions 5 and 6 and the rain main body portion 4, respectively. The rain main body portion 4, the mounting bracket portions 5 and 6, and the step portions 7 and 8 are integrally formed by hot pressing a single steel plate material or the like.

  Bracket reinforcement members 9 are disposed along the inner wall surfaces of the mounting bracket portions 5 and 6 and the stepped portions 7 and 8 at both left and right end portions of the bumper reinforcement 2. A reinforcing rib member 10 is disposed between the rain main body portion 4 and the rear surface thereof. The bracket reinforcing member 9 and the reinforcing rib member 10 are fixed to the inner wall surface of the bumper reinforcement 2 by means such as spot welding. Yes. A pair of left and right mounting brackets 11 to which a tow hook (not shown) is attached are disposed in the rain main body 4 of the bumper reinforcement 2.

  The rain main body portion 4 of the bumper reinforcement 2 has a front wall plate 12 and an upper wall plate 13 and a bottom wall plate 14 extending from the upper and lower ends of the vehicle body to the rear side of the vehicle body. It is formed in a substantially U-shaped cross section. The front wall plate 12 of the rain main body 4 is provided with a reinforcing bead 15 extending in the vehicle width direction at a predetermined position, and an opening for projecting the front end of the traction hook mounting bracket 11 forward. A portion 16 is provided.

The step portion 7 provided on the upper side of the bumper reinforcement 2 is a vertical wall plate having a predetermined width projecting upward from the left and right rear end portions of the upper wall plate 13 of the rain main body portion 4. It is installed so as to face the front upper end of the frame 1. Further, the step portion 8 provided on the lower side of the bumper reinforcement 2 is a vertical wall plate having a predetermined width protruding downward from the left and right rear end portions of the bottom wall plate 14 of the rain main body portion 4. The front side frame 1 is installed at a position facing the lower front end portion of the front side frame 1. And the side edge part of the flange part 4a protruded up and down of the rain main-body part 4 is connected to the inner edge part of the said level | step-difference parts 7 and 8 (refer FIG. 2).

  The upper mounting bracket portion 5 projects from the upper end of the stepped portion 7 provided on the upper side of the bumper reinforcement 2 to the rear side of the vehicle body, and is provided on the lower side of the bumper reinforcement 2. The lower mounting bracket portion 6 projects from the lower end portion of the stepped portion 8 to the rear side of the vehicle body. As shown in FIGS. 5 and 6, the upper mounting bracket portion 5 is formed so that its width dimension is larger than that of the lower mounting bracket portion 6, and the front side frame 1 is fronted by a pair of left and right mounting bolts 17. The lower mounting bracket 6 is fixed to the front surface of the front side frame 1 by a single mounting bolt 18.

The bracket reinforcing member 9 connects a pair of upper and lower horizontal portions 19 and 20 formed in a size corresponding to the mounting bracket portions 5 and 6 of the bumper reinforcement 2 and the front ends of the horizontal portions 19 and 20. And a pair of upper and lower shroud fastening portions 22, 23 extending from the vertical portion 21 to the inner side of the vehicle body. The vertical portion 21 has an opening 24 a for weight reduction. Is formed. The vertical portions 21 are arranged along the inner surfaces (rear surfaces) of the stepped portions 7 and 8 by, for example, spot welding the horizontal portions 19 and 20 of the bracket reinforcing member 9 to the inner surfaces of the mounting bracket portions 5 and 6. It is fixed to the bumper reinforcement 2 in the installed state, and the shroud fastening portions 22 and 23 protrude in the vertical direction of the rain main body portion 4 and extend from the mounting bracket portions 5 and 6 to the inner side of the vehicle body. It is set up in a state.

The reinforcing rib member 10 has a vertical wall portion 25 having a pair of upper and lower bead portions 24 extending in the front-rear direction of the vehicle body, and mounting flange portions 26 to 29 provided at both upper and lower end portions and front and rear end portions. These mounting flange portions 26 to 29 are spotted on the upper and lower wall plates 13 and 14 of the rain main body portion 4 and the inner surfaces of the side end portions of the front wall plate 12 and the outer end front surface of the vertical portion 21 of the bracket reinforcing member 9. It is configured to be disposed between the front surface of the bracket reinforcing member 9 and the back surface of the rain main body portion 4 at a position facing the outer wall portion 35 of the front side frame 1 by welding or the like.

  As shown in FIG. 2, the mounting bracket 11 for the traction hook includes a cylindrical portion 30 having a screw hole into which a traction hook (not shown) is screwed, and a substrate 31 to which the cylindrical portion 30 is fixed. And mounting flange portions 32, 33 provided at both upper and lower ends thereof, and the mounting flange portions 32, 33 are spot welded to the upper and lower wall portions 13, 14 of the rain main body portion 4. The cylindrical portion 30 is attached to the bumper reinforcement 2 in a state in which the distal end portion protrudes forward from the opening portion 16 of the rain main body portion 4.

Further, as shown in FIG. 5, the front side frame 1 has a substantially L-shaped cross section having an outer wall portion 35 extending in the vertical direction and a bottom wall portion 36 extending from the lower end portion thereof to the inward side of the vehicle body. A vehicle body outer side member 37, an upper wall portion 38 extending in the horizontal direction, an inner wall portion 39 extending downward from the inner end portion thereof, and a bottom wall portion 40 extending from the lower end portion thereof to the outer side of the vehicle body. A vehicle body inner side member 41 having a substantially U-shaped cross section. The upper part of the vehicle body outer side member 37 and the vehicle body inner side member 41 are substantially horizontal (the vehicle body outer side) along the upper wall surface of the front side frame 1, that is, the upper wall part 38 of the vehicle body outer side member 37. joining flange portions 42, 43 of predetermined width is provided extending) in a lower part of the outside of the vehicle body-side member 37 and the vehicle body inner side member 41, projecting downward from the end portion of the bottom wall portion 36, 37 The joined flange portions 44 and 45 are provided.

  Then, a rectangular closed cross section composed of the vehicle body outer side member 37 and the vehicle body inner side member 41 is formed by spot welding the both joint flange portions 42 and 43 and the both joint flange portions 44 and 45, respectively. Yes. In addition, a front end reinforcing member 46 having a predetermined width is fixed to the inner surface of the front end portion of the vehicle inner side member 41 constituting the front side frame 1 by means of spot welding or the like, and the front end of the vehicle outer side member 37 A front end reinforcing member 47 having a predetermined width is fixed to the inner surface of the part by means such as spot welding. 3 and 4, reference numeral 1 a denotes a closing plate that closes the front end portion of the front side frame 1.

Front end reinforcement member 46 of the vehicle body inner side member 41 side, the upper surface portion 48 extending in the horizontal direction, the side surface portion 49 extending downward from its inner end, extending outward from the lower end Nuts 51 and 52 to which mounting bolts 17 and 18 for bumper reinforcement are screwed are fixed in advance to the upper surface portion 48 and the bottom surface portion 50. Yes. A pair of upper and lower reinforcing beads 53 extending in the front-rear direction of the vehicle body are formed on the side surface portion 49 of the front end portion reinforcing member 46 and the wall surface of the front end portion reinforcing member 47.

A front portion of a vehicle having a bumper reinforcement 2 that is detachably attached to the front end portions of the front side frames 1 disposed on the left and right sides of the vehicle body and connects the front end portions of the front side frames 1 as described above. In the vehicle body structure, the bumper reinforcement 2 is provided with a rain main body portion 4 extending in the vehicle width direction and fixed to the upper and bottom wall surfaces of the front side frame 1 by mounting bolts 17 and 18 at both left and right ends thereof. Mounting bracket portions 5 and 6 are provided, and stepped portions 7 and 8 are provided between the mounting bracket portions 5 and 6 and the rain main body portion 4 so as to face the front upper end portion and the front lower end portion of the front side frame 1. and therefore, effective front end portion of the front side frame 1 obliquely collision of an automobile is being deformed by a simple structure It is possible to prevent.

That is, when the front end portion of the automobile collides with the support column or when an oblique collision load acts on the front portion of the automobile, a pressing load to the rear side acts on the bumper reinforcement 2 and the bumper rain Moment loads act on the left and right ends of the force 2, and the steps provided between the mounting bracket portions 5 and 6 of the bumper reinforcement 2 and the rain main body 4 according to these loads. When the parts 7 and 8 are brought into contact with one of the front end reinforcing members 46 and 47 attached to the front end part of the front side frame 1, bumper reinforcement is formed by the abutting part and the mounting bolts 17 and 18. The load at the time of the collision is distributed to the upper wall surface and the bottom wall surface of the front side frame 1 to which the mounting bracket portions 5 and 6 of 2 are fixed. It has been made to be supported.

Accordingly, as shown in FIG. 7, obliquely from the front to the bumper reinforcement 6 0 obliquely collision of an automobile to receive a load F, the bumper reinforcement 6 0 provided at the front end of the front side frame 61 by acting to concentrate the mounting flange 6 2, 6 3 moment load, the bumper reinforcement 2 in the mounting flange portion 6 2, 6 3 without causing an adverse effect that the bending deformation, simple construction Is stably supported on the front end portion of the front side frame 1, so that there is an advantage that damage to the front side frame 1 can be effectively suppressed.

  Further, in the above-described embodiment, the front side frame 1 is constituted by the vehicle body outer side member 37 and the vehicle body inner side member 41, and provided on the vehicle body outer side member 37 and the vehicle body inner side member 41, respectively. Since the joined flange portions 42 and 43 are extended substantially horizontally along the upper wall surface of the front side frame 1, the upper wall surface (upper wall portion 38) of the front side frame 1 and the vehicle body along the upper wall surface are provided. With the joint flange portion 42 extending outward, a mounting surface having a large area for fixing the mounting bracket portion 5 of the bumper reinforcement 2 is formed. Therefore, it is possible to easily perform the operation of attaching the attachment bracket portion 5 of the bumper reinforcement 2 to the front end portion of the front side frame 1 by the attachment bolt 17, and it is possible to effectively stabilize the attachment state.

Further, in the above embodiment, the substantially U-shaped front end reinforcing member 46 is disposed along the inner surface of the front end portion of the vehicle body inner side member 41 constituting the front side frame 1, and the front end portion reinforcing member 46 is provided with the front end portion reinforcing member 46. Since the nuts 51 and 52 to which the mounting bolts 17 and 18 for the bumper reinforcement are screwed are integrally fixed in advance, the above-mentioned abbreviated shape is formed along the inner surface of the front end portion of the vehicle body inner side member 41 constituting the front side frame 1. while joined by disposing the U-shaped front end reinforcing member 46, the joint flange sections 42, 43 and bonding flange 44, 45 of the vehicle outside lateral member 37 and the vehicle body inward side member 41 to each other welding By doing so, the front side frame 1 having the nuts 51 and 52 to which the mounting bolts 17 and 18 of the mounting bracket portions 5 and 6 are screwed is easily formed. It is possible, the fixing state of the mounting bracket 5 and 6 the front end of the front side frame 1 and effectively reinforced by the front end reinforcing member 46 can be stabilized. Instead of the above-described embodiment in which the nuts 51 and 52 are welded to the front end reinforcing member 46, a structure in which screw holes are directly formed in the upper surface portion 48 and the bottom surface portion 50 of the front end reinforcing member 46 may be employed.

  Moreover, in the said embodiment, while the rain main-body part 4, the mounting bracket parts 5 and 6, and the level | step-difference parts 7 and 8 of the bumper reinforcement 2 are integrally molded by one board | plate material, the mounting bracket of the bumper reinforcement 2 is used. Since the bracket reinforcing member 9 is disposed along the inner surfaces of the portions 5 and 6 and the stepped portions 7 and 8, the bumper reinforcement 2 that is light and rigid can be easily and inexpensively manufactured by processing a single plate material. be able to. In addition, by reinforcing the mounting bracket portions 5 and 6 and the stepped portions 7 and 8 of the bumper reinforcement 2 with the bracket reinforcing member 9, it is possible to stably support a collision load of an automobile acting on this portion. Therefore, there is an advantage that it is possible to more effectively prevent the front end portion of the front side frame 1 from being deformed according to the collision load or the like.

  In particular, the rain main body portion 4 and the mounting bracket portion 5 of the bumper reinforcement 2 are formed by a hot press molding method in which a steel plate material or the like is inserted between hot plates and the movable surface plate is operated by hydraulic pressure or the like. 6 and the stepped portions 7 and 8 are integrally formed, there is an advantage that the bumper reinforcement 2 whose sectional shape changes in a complicated manner can be formed easily and appropriately.

  Further, in the above embodiment, the gap between the front surface of the bracket reinforcing member 9 disposed along the inner surfaces of the mounting bracket portions 5 and 6 and the stepped portions 7 and 8 of the bumper reinforcement 2 and the rear surface of the rain main body portion 4. Since the reinforcing rib member 10 is provided on the front side of the vehicle, the bracket reinforcing member 9 and the rain main body portion according to the load acting in the direction of pressing the bumper reinforcement 2 rearward at the time of a frontal collision or an oblique collision of the automobile. By compressing and deforming (crushing) the reinforcing rib member 10 disposed between the front side frame 1 and the front side frame 1, there is an advantage that damage to the front side frame 1 can be more effectively suppressed. .

  In particular, as shown in the above-described embodiment, when the reinforcing rib member 10 is disposed at a position facing the outer wall portion 35 of the front side frame 1, it acts during a frontal collision or an oblique collision of an automobile. According to the impact load, there is an advantage that the reinforcing rib member 10 can be reliably compressed and deformed to absorb the impact load efficiently. Even when the reinforcing rib member 10 is disposed at a position facing the inner wall 39 of the front side frame 1, the reinforcing rib member 10 can be used in accordance with an impact load that acts during a frontal collision or an oblique collision of an automobile. The material 10 can be reliably compressed and deformed to efficiently absorb the collision load.

Further, as shown in the above embodiment, when the pair of upper and lower radiator shroud fastening portions 22, 23 projecting inward of the vehicle body are provided on the bracket reinforcing member 9, the rain main body portion 4 of the bumper reinforcement 2 is provided. The radiator shroud 3 is moved back and forth by attaching the radiator shroud 3 to the radiator shroud fastening portions 22 and 23 projecting inwardly of the mounting bracket portions 5 and 6. There is an advantage that the tilting can be effectively prevented and the radiator shroud 3 can be stably supported.

  In the above embodiment, the stepped portions 7 and 8 facing the front upper end portion and the front lower end portion of the front side frame 1 are provided between the pair of upper and lower mounting bracket portions 5 and 6 and the rain main body portion 4. Although the example has been described, stepped portions 7 and 8 are provided between either one of the mounting bracket portions 5 and 6 and the rain main body portion 4 so as to face the front upper end portion or the front lower end portion of the front side frame 1. It is good also as a structure.

Further, instead of the above-described embodiment in which the joining flange portions 42 and 43 provided on the upper portion of the front side frame 1 are extended substantially horizontally along the upper wall surface of the front side frame 1, the vehicle body outer side member 37 and The joining flange portions 44 and 45 provided respectively in the lower part of the vehicle body inner side member 41 may be configured to extend substantially horizontally along the bottom wall surface (bottom wall portion 40) of the front side frame 1. Both the portions 42 and 43 and the joint flange portions 44 and 45 may be configured to extend substantially horizontally toward the outer side or the inner side of the vehicle body.

  Further, instead of the above embodiment in which the substantially U-shaped front end portion reinforcing member 46 is disposed along the inner surface of the front end portion of the vehicle body inner side member 41 constituting the front side frame 1, the front side frame 1 is configured. A substantially U-shaped front end reinforcing member 46 is disposed along the inner surface of the front end portion of the vehicle body outer side member 37, and bumper reinforcement mounting bolts 17 and 18 are screwed to the front end reinforcing member 46. The nuts 51 and 52 to be attached may be provided or a screw hole may be formed.

1 is an exploded perspective view showing an embodiment of a front body structure of an automobile according to the present invention. It is a disassembled perspective view which shows the specific structure of a bumper reinforcement. It is side surface sectional drawing which shows the attachment state of bumper reinforcement. It is a top sectional view showing the state before attachment of bumper reinforcement. It is front sectional drawing which shows the structure of the front-end part of a front side frame. It is a front view which shows the specific structure of a bracket reinforcement member. It is a plane sectional view showing the conventional example of the present invention.

DESCRIPTION OF SYMBOLS 1 Front side frame 2 Bumper reinforcement 3 Radiator shroud 4 Rain main-body part 5,6 Mounting bracket part 7,8 Step part 9 Bracket reinforcement member 10 Reinforcement rib material 17,18 Mounting bolt 22,23 Shroud fastening part

Claims (6)

  In the front vehicle body structure of a vehicle having a bumper reinforcement that is detachably attached to the front end portions of the front side frames disposed on the left and right sides of the vehicle body and connects the front end portions of both front side frames, the bumper rain The reinforcement is provided with a rain main body portion extending in the vehicle width direction, and mounting bracket portions fixed to the upper wall surface and the bottom wall surface of the front side frame by mounting bolts at the left and right ends thereof, A front vehicle body structure for an automobile, wherein a step portion facing at least one of a front upper end portion or a front lower end portion of a front side frame is provided between the rain main body portion.   The front side frame is composed of a vehicle body outer side member and a vehicle body inner side member, and at least one of the joint flange portions provided respectively above and below the vehicle body outer side member and the vehicle body inner side member is connected to the front side frame. 2. The front body structure of an automobile according to claim 1, wherein the front body structure extends substantially horizontally along an upper wall surface or a bottom wall surface of the frame. A substantially U-shaped front end reinforcement member is disposed along the inner surface of the front end portion of the vehicle body outer side member or vehicle body inner side member constituting the front side frame, and a bumper reinforcement is provided on the front end reinforcement member. The front body structure of an automobile according to claim 2 , further comprising a nut portion to which a mounting bolt for use is screwed.   The rain body of the bumper reinforcement, the mounting bracket, and the step are integrally formed from a single plate, and the bracket reinforcement member is joined along the inner surface of the mounting bracket and the step of the bumper reinforcement. The front body structure of an automobile according to any one of claims 1 to 3.   5. The reinforcing rib member is disposed between the front surface of the bracket reinforcing member joined along the inner surface of the mounting bracket portion and the step portion of the bumper reinforcement and the rear surface of the rain main body portion. Front car structure of the described car.   6. The front body structure of an automobile according to claim 5, wherein the bracket reinforcing member is provided with a pair of upper and lower radiator shroud mounting portions protruding inward of the vehicle body.

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