JP2010023792A - Vehicle body front part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body front part structure, using a bracket capable of fixing both of a radiator and a bumper face to a front bulkhead. <P>SOLUTION: In the structure, the radiator 11 and the bumper surface 16 are mounted on a bulkhead upper frame 3 via the bracket (upper-part bracket 20). The bracket has its body part 21, and a radiator fixing piece 22 which is branched into two from the body part to be connected to the projected radiator and a bumper face fixing piece 23 connected to the bumper face. The radiator-fixing piece has a first fixed part 33 fixed to the bulkhead upper frame at a base-end part 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body front structure, and more particularly to a vehicle body front structure in which a radiator and a bumper face are fixed to a bulkhead upper frame via a bracket.

Conventionally, a radiator is fixed to a substantially rectangular front bulkhead (radiator core support) constituting a front end portion of a vehicle body skeleton structure via a bracket (for example, Patent Document 1). Some bumper faces are fixed to the front bulkhead via brackets. These brackets are usually prepared as separate bodies.
Japanese Patent Laid-Open No. 2005-35407

  If the bracket for fixing the radiator and the bracket for fixing the bumper face can be integrated, the number of parts, the weight of the vehicle body, and the number of mounting steps can be reduced. However, when the bracket is integrated, there is a possibility that vibrations generated in the radiator or the bumper face may affect each other, and resonance may occur in some cases. In particular, in a bracket having a structure in which two members are supported by one cantilever, such as extending the tip of the bracket for fixing the radiator and fixing the bumper face to the tip, the occurrence of resonance Will be prominent.

  The present invention has been made in view of the above problems, and fixes both the radiator and the bumper face to the front bulkhead while preventing the vibrations generated in each of the radiator and the bumper face from affecting each other. An object of the present invention is to provide a vehicle body front structure using a bracket that can be used.

  In order to solve the above problems, a first aspect of the present invention is a vehicle body front structure in which a radiator (11) and a bumper face (16) are attached to a bulkhead upper frame (3) via a bracket (upper bracket 20). The bracket includes a main body portion (21), a radiator fixing piece (22) coupled to the radiator bifurcated from the main body portion, and a bumper face fixing piece (23) coupled to the bumper face. The radiator fixing piece has a first fixing portion (33) fixed to the bulkhead upper frame at a base end portion (32).

  According to this, since the radiator fixing piece and the bumper face fixing piece are connected via the main body fixed to the bulkhead upper frame, vibrations generated in the radiator fixing piece or the bumper face fixing piece influence each other. It is prevented. Further, since vibration generated in the radiator fixing piece is blocked by the first fixing portion, it is prevented from being transmitted to the bumper face fixing piece, and conversely, vibration generated in the bumper face fixing piece is transmitted to the radiator fixing piece. Will be prevented. Therefore, the vibration generated in each of the radiator fixing piece and the bumper face fixing piece is prevented from overlapping, and the occurrence of resonance is prevented.

  The second invention is the first invention, wherein the bracket further includes a second fixing portion (27) fixed to the bulkhead upper frame, and the bulkhead upper frame in the vehicle front-rear direction in the first fixing portion. And fixed to the upper part (upper surface part 3b) of the bulkhead upper frame in the second fixing part.

  According to this, the bracket is securely fixed to the bulkhead upper frame, and the radiator and the bumper face are securely fixed to the bulkhead upper frame. Further, the vibration generated in each of the radiator fixing piece and the bumper face fixing piece is blocked by the main body portion, thereby preventing the occurrence of resonance.

  According to a third invention, in the first or second invention, the bumper face fixing piece includes a reinforcing bead (41) extending in a longitudinal direction.

  According to this, appropriate rigidity can be imparted to the bumper face fixing piece.

  According to a fourth invention, in any one of the first to third inventions, the radiator fixing piece is higher in rigidity than the bumper face fixing piece.

  According to this, since there is a difference in rigidity between the radiator fixing piece and the bumper face fixing piece, the natural frequencies of the two fixing pieces are different and the occurrence of resonance is prevented.

  By configuring as described above, the bracket of the vehicle body front structure can fix both the radiator and the bumper face while preventing the vibrations generated in the radiator or the bumper face from being transmitted to each other.

Hereinafter, an embodiment of a vehicle body front part structure of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing a vehicle body front structure according to the embodiment. For convenience of explanation, the traveling direction of the automobile to which the present invention is applied is the forward direction, the direction opposite to the traveling direction is the backward direction, the right side when facing forward is the right side, the left side is the left, the vertical upper side is the upper side, and the vertical lower side is the lower side. explain.

  As shown in FIG. 1, a front bulkhead 2 disposed at a front end portion of a vehicle body front structure 1 includes a bulkhead upper frame 3 extending in the left-right direction on the upper side, and a bulkhead upper frame 3. Bulkhead side frame 4 extending downward from each of the left and right ends, and a bulkhead lower extending in the left-right direction and coupled to the lower ends of both bulkhead side frames 4 at the middle in the left-right direction It is comprised from the frame 5, and is exhibiting the substantially rectangular shape. The bulkhead upper frame 3 is disposed on the rear side with respect to the bulkhead lower frame 5, and the front bulkhead 2 is tilted rearward.

  Both ends of the bulkhead lower frame 5 are coupled to a lower member 6 that extends while being curved upward and rearward. The lower member 6 is connected to the front end of a wheel house upper member (not shown) whose rear end is connected to a front pillar (not shown) at the rear end.

  Both bulkhead side frames 4 are coupled to the vicinity of the front end portion of the front side frame 7 extending in the longitudinal direction of the vehicle body on the side of the vehicle in the middle in the vertical direction. Both front side frames 7 protrude forward from the bulkhead side frame 4, and a front bumper beam 8 is spanned between front end portions, and is connected to the lower member 6 via a gusset 9. Further, both the bulkhead side frames 4 are connected to each other through a lower member 6 and a bulkhead side frame 10 at an intermediate portion between the upper end portion and the connecting portion of the front side frame 7.

  A lower bracket 12 that supports the lower end of the radiator 11 is fixed to the bulkhead lower frame 5. The lower bracket 12 has two projecting portions 13 projecting toward the rear side of the bulkhead lower frame 5, and each projecting portion 13 has a hole 15 into which the rubber bush 14 is fitted.

  The bulkhead upper frame 3 is a member in which a steel plate is three-dimensionally formed by press working, and includes a front surface portion 3a and an upper surface portion 3b that are perpendicular to each other. A bent portion 3c is formed between the front surface portion 3a and the upper surface portion 3b. The front surface portion 3a and the upper surface portion 3b are provided with holes 17 and 18 for attaching an upper bracket 20 described later. A weld nut (not shown) is fixed to the back surface side of the front surface portion 3a and the upper surface portion 3b of the holes 17 and 18. A hole 19 for positioning the upper bracket 20 is formed in the front surface portion 3a.

  The upper bracket 20 is a member for fixing the radiator 11 and the bumper face 16 to the bulkhead upper frame 3. FIG. 2 is a perspective view showing the upper bracket of the vehicle body front structure. As shown in FIG. 2, the upper bracket 20 is formed by bending a plate-like member, and includes a main body 21, a radiator fixing piece 22 and a bumper face fixing piece that branch out from the main body 21 and extend. 23. The upper bracket 20 is formed, for example, by press forming a steel plate. The upper bracket 20 is fixed to the bulkhead upper frame 3 at the first fixing portion 33 and the second fixing portion 27.

  The main body 21 is bent vertically at an intermediate portion so as to be in contact with the upper surface portion 3b and the front surface portion 3a of the bulkhead upper frame 3, and an upper surface portion 24 that is in contact with the upper surface portion 3b of the bulkhead upper frame 3. A side surface portion 25 that contacts the front surface portion 3a of the bulkhead upper frame 3 is formed. The bent portion 26 between the upper surface portion 24 and the side surface portion 25 is formed to have a curvature that substantially matches the curvature of the bent portion 3 c so as to be along the outer surface of the bent portion 3 c of the bulkhead upper frame 3.

  The upper surface portion 24 of the main body portion 21 forms a second fixing portion 27 that is fixed to the upper surface portion 3 b of the bulkhead upper frame 3, and a second mounting hole 28 is drilled. Further, a cantilever piece 43 formed by being cut out in a U shape is provided on the side surface portion 25 of the main body portion 21. The cantilever piece 43 is bent at the base end portion and extends rearward. The cantilever piece 43 temporarily determines the position of the upper bracket 20 with respect to the bulkhead upper frame 3 by engaging with the hole 19 of the bulkhead upper frame 3 when the upper bracket 20 is attached to the bulkhead upper frame 3. .

  The radiator fixing piece 22 extends downward from the peripheral edge portion of the main body portion 21, and then is bent vertically and extends forward to form a tip portion 29. A radiator mounting hole 31 into which the rubber bush 30 is fitted is formed at the distal end portion 29 of the radiator fixing piece 22 by burring. The base end portion 32 of the radiator fixing piece 22 forms a first fixing portion 33 that is fixed to the front surface portion 3a of the bulkhead upper frame 3, and a first attachment hole 34 is formed therein.

  The bumper face fixing piece 23 is spaced apart from the radiator fixing piece 22 and extends downward from the peripheral edge of the main body portion 21 substantially in parallel with the radiator fixing piece 22 and then bent vertically and extends forward. The tip portion 35 is formed. Thereby, a slit 36 is formed between the radiator fixing piece 22 and the bumper face fixing piece 23. The front end portion 35 of the bumper face fixing piece 23 extends further forward than the front end portion 29 of the radiator fixing piece 22. A bumper face mounting hole 37 is formed in the distal end portion 35 of the radiator fixing piece 22. The bumper face fixing piece 23 is formed narrower than the radiator fixing piece 22.

  The front end of the slit 36 extends to a position at least as high as the first mounting hole 34 in the vertical direction, and may extend upward from the first mounting hole 34 in other embodiments.

  The upper bracket 20 is raised over substantially the entire peripheral edge, and a reinforcing rib 38 is formed. Further, the upper bracket 20 includes a first recess 39 that passes from the front end portion 29 of the radiator fixing piece 22 through the side surface portion 25 of the main body portion 21 to the upper surface portion 24, and the front end portion 35 of the bumper face fixing piece 23. A second recess 40 that passes through the side surface 25 of the main body 21 and reaches the upper surface 24 is provided. The 1st recessed part 39 and the 2nd recessed part 40 are extended in general mutually, and are not connected.

  The second recess 40 is provided with a reinforcing bead 41 that extends along the longitudinal direction of the bumper face fixing piece 23 and reaches the side surface 25 of the main body 21. In another embodiment, the reinforcing bead 41 may be extended to reach the upper surface portion 24 of the main body portion 21.

  As shown in FIG. 1, the radiator 11 attached to the front bulkhead 2 includes a radiator core 50, an upper tank 51 provided at the upper portion of the radiator core 50, and a lower tank 52 provided at the lower portion of the radiator core 50. ing. An upper support pin 53 protrudes upward from the upper surface of the upper tank 51, and two lower support pins 54 protrude downward from the lower surface of the lower tank 52.

  The radiator 11 fits the lower support pin 54 to the rubber bush 14 fitted in the hole 15, fits the upper support pin 53 to the rubber bush 30 fitted to the radiator mounting hole 31 of the upper bracket 20, By fixing the upper bracket 20 to the bulkhead upper frame 3, the upper bracket 20 is fixed to the front bulkhead 2. The upper bracket 20 is formed by inserting a bolt 55 into each hole and screwing with a weld nut in a state where the first mounting hole 34 and the hole 17 and the second mounting hole 28 and the hole 18 are aligned with each other. Fastened to the upper frame 3.

  FIG. 3 is a perspective view showing the front structure of the vehicle body in a state where the radiator is fixed, and the front bumper beam and the front side frame are omitted. As shown in FIG. 3, when the upper bracket 20 is fixed to the bulkhead upper frame 3, the radiator 11 is restricted from moving in the vertical direction with respect to the front bulkhead 2, and the upper and lower support pins 53 and 54 are The rubber bushes 14 and 30 cannot be detached and are stably fixed.

  FIG. 4 is a perspective view showing the vehicle body front structure in a state where the radiator and the bumper face are fixed. As shown in FIG. 4, a flange portion 56 extending in the vehicle width direction and substantially in the horizontal direction is formed at the upper end portion of the bumper face 16 extending in the vehicle width direction, and a hole 57 is formed in the flange portion 56. Has been. The bumper face 16 is fixed to the upper bracket 20 by inserting a clip 58 for fastening both holes in a state where the hole 57 and the bumper face mounting hole 37 of the upper bracket 20 are aligned. The clip 58 may be a known clip formed of a head portion, a leg portion that can be inserted into the hole, and a check engagement claw formed on the leg portion to be engaged with the hole.

  The effect of the vehicle body front part structure comprised as mentioned above is demonstrated. Since the upper bracket 20 in the vehicle body front structure includes the radiator mounting hole 31 and the bumper face mounting hole 37 in one bracket, the number of brackets necessary for fixing the radiator 11 and the bumper face 16 can be reduced. For this reason, it is possible to reduce the weight of the vehicle body and the number of mounting steps.

  Since the upper bracket 20 has a structure in which the radiator fixing piece 22 and the bumper face fixing piece 23 are bifurcated with respect to the main body portion 21, vibrations transmitted from the radiator 11 or the bumper face 16 influence each other. It is difficult to give. Further, in the first fixing portion 33 formed at the base end portion 32 of the radiator fixing piece 22, the upper bracket 20 is fixed to the bulkhead upper frame 3, so that vibration from the radiator 11 is generated by the first fixing portion 33. Thus, the vibration from the bumper face 16 is prevented from being transmitted to the radiator fixing piece 22 beyond the first fixing portion 33.

  Since the main body 21 is also fixed to the bulkhead upper frame 3 in the second fixing portion 27, the upper bracket 20 is firmly fixed, and vibration is transmitted between the radiator fixing piece 22 and the bumper face fixing piece 23. Inhibits. Since the first fixing portion 33 and the second fixing portion 27 are arranged so as to surround the bulkhead upper frame 3, the fixing state of the upper bracket 20 is stronger.

  Since the upper bracket 20 includes the first and second recesses 39 and 40 and the reinforcement beads 41 extending substantially in parallel, the vibration generated in the radiator fixing piece 22 and the bumper face fixing piece 23 is hardly affected. ing. Further, the radiator fixing piece 22 is wider and shorter than the bumper face fixing piece 23, and thus has high rigidity. For this reason, a difference occurs in the natural frequency of the radiator fixing piece 22 and the bumper face fixing piece 23, and resonance is difficult to occur.

  Although the description of the specific embodiment is finished as above, the present invention is not limited to the above embodiment and can be widely modified. For example, in the embodiment, the upper bracket 20 and the bulkhead upper frame 3 are fixed by bolt fastening, but both members may be fixed by welding without providing the first and second mounting holes 34 and 28. In addition, the shape of the bracket is an example, and can be appropriately changed without departing from the gist of the present invention.

It is a disassembled perspective view which shows the vehicle body front part structure which concerns on embodiment. It is a perspective view which shows the upper bracket of a vehicle body front part structure. It is a perspective view which shows the vehicle body front part structure of the state which fixed the radiator. It is a perspective view which shows the vehicle body front part structure of the state which fixed the radiator and the bumper face.

Explanation of symbols

2 Front bulkhead 3 Bulkhead upper frame 3a Front surface portion 3b Upper surface portion 11 Radiator 12 Lower bracket 14, 30 Rubber bush 16 Bumper face 20 Upper bracket 21 Main body portion 22 Radiator fixing piece 23 Bumper face fixing piece 24 Upper surface portion 25 Side surface portion 27 Second fixing portion 31 Radiator mounting hole 32 Base end portion 33 First fixing portion 37 Bumper face mounting hole 41 Reinforcement bead

Claims (4)

In the vehicle body front structure where the radiator and bumper face are attached to the bulkhead upper frame via a bracket,
The bracket is
The main body,
A radiator fixing piece that is coupled to the radiator that is bifurcated from the main body and protrudes, and a bumper face fixing piece that is coupled to the bumper face;
The radiator fixing piece has a vehicle body front portion structure having a first fixing portion fixed to the bulkhead upper frame at a base end portion.   The bracket further includes a second fixing portion that is fixed to the bulkhead upper frame. The bracket is fixed to a front portion of the bulkhead upper frame in the vehicle front-rear direction, and the second fixing portion includes the second fixing portion. The vehicle body front part structure according to claim 1, wherein the vehicle body front part structure is fixed to an upper part of the bulkhead upper frame.   The vehicle body front part structure according to claim 1, wherein the bumper face fixing piece includes a reinforcing bead extending in a longitudinal direction.   The vehicle body front part structure according to any one of claims 1 to 3, wherein the radiator fixing piece is higher in rigidity than the bumper face fixing piece.

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