JP4014292B2 - Front body structure of the vehicle - Google Patents

Description

BACKGROUND OF THE INVENTION
The present invention relates to a front body structure of a vehicle, and more specifically, to a structure of a front pillar portion for mounting and supporting a steering support beam.
[Prior art]
In general, in a vehicle, a steering support beam is attached between the left and right front pillars, and a steering shaft (column shaft) is supported on the steering support beam, thereby suppressing vibration of the steering wheel during, for example, traveling on a rough road. The support rigidity of the steering shaft at the time of a collision is increased.
As shown in FIG. 3, for example, as shown in FIG. 3, the steering support beam has both ends attached to the inner side of the inner panel b of the front pillar a. A structure in which a bracket e for mounting the beam d is fixed and a closed cross section is formed by the bracket e, the inner panel b, and the bulkhead f to increase the rigidity around the front pillar a is conventionally known ( (See Japanese Utility Model Publication No. 2-48298).
[Problems to be solved by the invention]
As described above, stiffening means such as a closed cross section is provided around the steering support beam mounting portion of the front pillar a in order to increase the steering support rigidity. Since the f ′ portion of the bulkhead f is likely to buckle against the input collision load, the closed cross section cannot sufficiently perform the function of transmitting the collision load to the front pillar a. However, the stiffening means of the steering support beam mounting portion has a problem that the contribution is low in terms of collision load transmission at the time of collision.
The present invention aims to solve the above-described conventional problems.
[Means for Solving the Problems]
According to the present invention, in a front pillar in which a pillar inner is configured by coupling a pillar inner upper and a pillar inner lower, a reinforcement for reinforcing a steering support beam mounting portion is joined and fixed to the pillar inner upper and the pillar inner lower. The reinforcement and the pillar inner upper are characterized in that a closed cross-sectional portion along the connecting portion between the pillar inner upper and the pillar inner lower is formed in the cross section of the front pillar. The pillar inner upper, the pillar inner lower, and the reinforcement constitute the pillar inner complex, so that the front end of the front pillar is connected to the front bulkhead with the closed cross section hardly offset from the frame front bulk in the vehicle width direction. It can be combined with the vertical plane Thus, the collision load input to the frame front bulk is efficiently transmitted from the closed cross section to the front pillar, and the closed cross section, which is a stiffening means for the steering support beam mounting section, is very effective in absorbing and reducing collision energy. Can contribute.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2, reference numeral 1 denotes a front pillar, and the front pillar 1 is constituted by a pillar inner 2 and a pillar outer 3 in a closed cross-sectional structure.
4 is a front bulkhead, 5 is a frame front bulk, 6 is a front panel, 7 is a dash upper, and 8 is a toe board. The rear end of the frame front bulk 5 is overlapped with the vertical surface of the front bulkhead 4 and is a front pillar. 1 is joined to the leading edge.
The pillar inner 2 of the front pillar 1 includes a pillar inner upper 21 and a pillar inner lower 22, and a peripheral portion of the connecting portion between the lower edge of the pillar inner upper 21 and the upper edge of the pillar inner lower 22 is a front pillar. The reinforcement 9 is reinforced and stiffened by a reinforcement 9 welded and fixed to the pillar inner upper 21 and the lower 22 within the closed cross section of the steering inner support beam 12. The end of each is attached by a mounting bolt directly or via a bracket or the like.
Hereinafter, a specific example of the reinforcement and stiffening structure by the reinforcement 9 will be described in detail with reference to FIG.
As shown in FIG. 2 (A), the reinforcement 9 has a plurality of bead portions 9a formed in the front-rear direction in order to increase the support strength against the load in the front-rear direction, and the upper edge portion is connected to the pillar inner upper 21. Spot welding W1 is performed in a three-ply manner while being sandwiched between the joints with the pillar inner lower 22 and the lower edge portion of the pillar inner upper 21 is the lower part of the joint fixing part to the pillar inner lower 22 and the reinforcement 9. The lower edge portion of the pillar inner upper 21 is joined to the top surface of the bead portion 9a on the upper side of the reinforcement 9 by spot welding W2. A closed cross-section portion 10 in the front-rear direction along the joint fixing portion between the upper 21 and the lower 22 of the pillar inner is formed at the upper portion of the reinforcement 9. It has become a strength of the bond portion, thereby improving the rigidity structure between upper 21 and lower 22 of the pillar inner through. Note that a flange 9b for preventing buckling is bent at the upper edge of the reinforcement 9. In FIG. 2A, 22a is a work hole for the spot welding W2.
The joints other than those described above between the reinforcement 9 and the pillar inner lower 22 are fixed by spot welding W3, and the spot weld W3 causes a plurality of front and rear directions at the bead 9a and the pillar inner lower 22 of the reinforcement 9 to be formed. A closed cross-section portion 11 is formed, and the joint portion between the upper 21 and the lower 22 of the pillar inner 2 and the periphery thereof are reinforced and stiffened by the closed cross-section portion 10 and the plurality of closed cross-section portions 11 therebelow. A steering support beam 12 is attached to the stiffened portion.
As described above, the pillar inner upper 21, the pillar inner lower 22, and the reinforcement 9 constitute a pillar inner 2 complex, which is assembled into the pillar outer 3, as shown in FIGS. 2 (B) and 2 (C). The rear joint is spot welded W4 and W5, and the front end joint is overlapped with the joint fixed part at the rear end of the frame front bulk 5 on the vertical surface of the front bulkhead 4 to perform spot welding W6.
In the spot weld W6 portion between the front end portion of the front pillar 1 and the front bulkhead 4 vertical surface, the front end portion of the pillar inner lower 22 is formed at the front end portion of the closed section 10 as shown in FIG. The front outer edge of the pillar outer 3 is notched, and the front end joint portion between the pillar inner upper 21 and the reinforcement 9 constituting the closed cross section 10 is spot-welded W6 to the vertical surface of the front bulkhead 4 to form the closed cross section 11. At the front end of
As shown in FIG. 2 (C), the front edge of the pillar inner lower 22 and the front edge of the pillar inner upper 21 are notched, and the front end joint between the reinforcement 9 and the pillar outer 3 is connected to the front bulkhead 4. An example of spot welding W6 on the vertical surface is shown.
This is because there is a limit to the number of plates that can be spot welded.
As described above, the reinforcement 9 is fixed to the pillar inner 2 to form the closed cross-section portions 10 and 11 in the front-rear direction, so that the rear end of the frame front bulk 5 is joined to the vertical surface of the front bulkhead 4 and closed. The offset in the vehicle width direction with respect to the cross-section portions 10 and 11 can be made extremely small, and the collision load input from the frame front bulk 5 is efficiently transmitted from the closed cross-section portions 10 and 11 to the front pillar 1. Will come to be. In the illustrated embodiment, a load transmitting bead portion 5a is formed at the rear end portion of the frame front bulk 5, and the collision load is more efficiently transmitted to the closed cross-section portions 10 and 11 by the load transmitting bead portion 5a. It has become so.
As described above, the mounting portion of the steering support beam 12 is reinforced and stiffened by the closed cross-sectional portions 10 and 11 formed in the longitudinal direction of the vehicle body by the pillar inner 2 and the reinforcement 9 bonded and fixed thereto. The collision load input to the frame front bulk 5 at the time of collision is efficiently transmitted from the closed cross-section portions 10 and 11 to the front pillar 1, and the closed cross-section portions 10 and 11 for stiffening the mounting portion of the steering support beam absorb the collision energy. , Can greatly contribute to reduction.
【The invention's effect】
As described above, according to the present invention, the reinforcement for the steering support beam mounting portion, the pillar inner upper, and the pillar inner lower constitute a pillar inner complex, and the reinforcement and the pillar inner upper By forming the closed cross section in the longitudinal direction of the vehicle body, it is possible to minimize the offset in the vehicle width direction between the frame front bulk and the closed cross section of the front pillar. Effectively transmitted to the closed cross section and the front pillar, and the stiffening means of the steering support beam mounting part can greatly contribute to the absorption and reduction of collision energy in the event of a vehicle collision. Combined with no additional cost, no assembly process increase, and low cost. It is those that can result in a great deal of effect.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a main part of a front pillar and a vehicle body in front of the front pillar, showing an example of an embodiment of the present invention.
2A is a cross-sectional view taken along line AA of the front pillar shown in FIG. 1, FIG. 2B is a cross-sectional view taken along line BB in FIG. 1A, and FIG. 2C is a cross-sectional view taken along line CC in FIG. .
FIG. 3 is a cross-sectional plan view showing an example of a stiffening means of a conventional steering support beam mounting portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Front pillar 2 Pillar inner 3 Pillar outer 4 Front bulkhead 5 Frame front bulk 5a Load transmission bead part 9 Reinforcement 9a Bead part 9b Flange 10 Closed section 11 Closed section 12 Steering support beam 21 Pillar inner upper 22 Pillar inner lower

Claims (4)

In the front pillar composed of a pillar inner and a pillar outer formed by coupling a pillar inner upper and a pillar inner lower, the upper edge portion of the reinforcement having a plurality of bead portions formed in the front-rear direction is formed on the pillar inner upper and the pillar inner. Bonded and fixed to the lower, the lower edge of the pillar inner upper is bent and displaced outwardly at the lower part of the bonded and fixed part to the pillar inner lower and the reinforcement, and extends downward. By connecting to the top surface of the bead portion , a closed cross-sectional portion along the coupling portion between the pillar inner upper and the pillar inner lower is formed in the cross section of the front pillar, and the pillar inner stiffened by the closed cross-sectional portion is formed. with attaching the steering support beam, so that the front end portion of the closed cross section is joined to the rear end of the frame front bulk Front body structure of a vehicle, characterized in that attached to the front end of the front pillar in a vertical plane of the front bulkhead. 2. The vehicle front body structure according to claim 1, wherein the reinforcement includes a plurality of bead portions in the vehicle front-rear direction, and the reinforcement is joined and fixed to the pillar inner lower. A front vehicle body structure for a vehicle, wherein a plurality of front and rear direction closed cross sections are formed below the closed cross section by the bead portion and the pillar inner lower. 3. The front body structure of a vehicle according to claim 1 or 2, wherein a flange for buckling prevention is bent at an upper edge portion of the reinforcement. . The front body structure of a vehicle according to any one of claims 1 to 3, wherein a collision load at the time of a collision is applied to the front bulkhead longitudinal surface of the joint portion of the frame front bulk rear end portion to the front bulkhead longitudinal surface. A vehicle body structure for a front portion of a vehicle, characterized in that a load transmitting bead portion for transmitting to a front pillar is provided.

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