JPH11342864A - Front body structure for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To let a stiffness reinforcing means contribute much to the absorption and reduction of collision energy to a great extent by giving a collision load transmitting function in vehicle collision to the stiffness reinforcing means of a steering support beam mounting part for a front pillar. SOLUTION: A reinforcement 9 for reinforcing the stiffness of a steering support beam mounting part is joined with/fixed to a pillar inner upper 21 and a pillar inner lower 22, which constitute a pillar inner 2, a closed cross sectional part 10 laid along the joint part of the pillar inner upper and the pillar inner lower is formed up inside a front pillar 1 using the reinforcement 9 and the pillar inner upper 21, the front end part of the front pillar 1 is combined with the vertical surface of a front bulkhead 4 in such a way that an offset in the car width direction between the closed cross sectional part 10 and the rear end part of a frame front bulk 5 will be very small, so that impact load applied to the frame front bulk 5 is thereby efficiently transmitted to the front pillar 1 from the closed cross sectional part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front body structure of a vehicle, and more particularly, to a structure of a front pillar for mounting and supporting a steering support beam.

2. Description of the Related Art Generally, in a vehicle, a steering support beam is attached between left and right front pillars, and a steering shaft (column shaft) is supported by the steering support beam. Vibration is suppressed, and the rigidity of the support of the steering shaft at the time of a collision is increased. As shown in FIG. 3, for example, as shown in FIG. 3, a structure of a mounting portion of both ends of the steering support beam to the front pillar includes a steering support a There is conventionally known a configuration in which a bracket e for attaching 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. See Japanese Utility Model Publication No. 2-48298).

As described above, stiffening means such as a closed 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 easily buckled with respect to a collision load input from the frame front bulk g at the time of a frontal collision, the closed cross section has a sufficient function of transmitting the collision load to the front pillar a. However, the conventional stiffening means of the steering support beam mounting portion has a problem that it has a low contribution in terms of transmitting a collision load at the time of a collision. An object of the present invention is to solve the conventional problems as described above.

According to the present invention, there is provided a front pillar in which a pillar inner is formed by coupling a pillar inner upper and a pillar inner lower, wherein a reinforcement for stiffening a steering support beam mounting portion is provided with the pillar inner upper. By being bonded and fixed to the pillar inner lower, the reinforcement and the pillar inner upper form a closed cross-section along the joint between the pillar inner lower and the pillar inner lower in the cross section of the front pillar. With the pillar inner upper and the pillar inner lower and the reinforcement configured as described above, the closed cross-section portion is hardly offset from the frame front bulk in the vehicle width direction. Front bulkhead at front end of front pillar It is possible to bind in a vertical plane,
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. Will be able to contribute.

Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a front pillar, and the front pillar 1 has a closed cross-sectional structure including a pillar inner 2 and a pillar outer 3. 4 is a front bulkhead, 5 is a frame front bulk,
Reference numeral 6 denotes a front panel, 7 denotes a dash upper, and 8 denotes a toeboard. The rear end of the frame front bulk 5 is overlapped with the vertical surface of the front bulkhead 4 and is connected to the front edge of the front pillar 1. The pillar inner 2 of the front pillar 1 is composed of a pillar inner upper 21 and a pillar inner lower 22, and a peripheral portion of a joint between a lower edge of the pillar inner upper 21 and an upper edge of the pillar inner lower 22 is a front pillar. 1 is reinforced and stiffened by a reinforcement 9 welded to the upper 21 and lower 22 of the pillar inner, and the steering support beam 12 is reinforced and stiffened by the reinforcement 9. Is mounted by mounting bolts 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. 2A, 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. Spot welding W1 is performed in a three-layered 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 formed by the pillar inner lower 22 and the reinforcement 9
By bending and displacing toward the outer side and extending downward at the lower portion of the joint fixing portion, the lower edge portion is joined to the top surface of the upper bead portion 9a of the reinforcement 9 to perform spot welding W2. The lower part of the inner upper 21 and the upper part of the reinforcement 9 form a closed cross section 10 in the front-rear direction along the joint fixing part between the upper 21 and the lower 22 of the pillar inner. The structure is such that the strength and rigidity of the joint between the upper 21 and the lower 22 are improved. A flange 9b for preventing buckling is bent at the upper edge of the reinforcement 9. In FIG. 2A, reference numeral 22a denotes a working hole for the spot welding W2. The other joints between the reinforcement 9 and the pillar inner lower 22 are fixed by spot welding W3, respectively, and the bead portion 9a of the reinforcement 9 and the pillar inner lower 22 form a plurality of front-rear directions by the spot welding W3. Closed section 11
Is formed, and the upper section 21 of the pillar inner 2 and the lower section 2 are formed by the closed section 10 and a plurality of closed sections 11 thereunder.
2 and its periphery are reinforced and stiffened, and the reinforced and stiffened portion is provided with a steering support beam 12.
Is attached. As described above, the pillar inner 2 is composed of the pillar inner upper 21, the pillar inner lower 22, and the reinforcement 9, and the pillar inner 2 is assembled on the pillar outer 3, as shown in FIGS. 2B and 2C. In addition, the rear joint is spot-welded W4 and W5, and the front joint is overlapped with the joint fixing portion at the rear end of the frame front bulk 5 on the vertical surface of the front bulkhead 4 and spot-welded W6. In the spot weld W6 between the front end of the front pillar 1 and the vertical surface of the front bulkhead 4, at the front end of the closed cross-section 10, as shown in FIG. The front edge of the pillar outer 3 and the pillar outer upper 3 are notched, and the front end joint of the pillar inner upper 21 and the reinforcement 9 forming the closed section 10 is spot-welded W6 to the vertical surface of the front bulkhead 4.
At the front end of the closed cross-section 11, as shown in FIG. 2C, the front edge of the pillar inner lower 22 and the front edge of the pillar inner upper 21 are notched, and the reinforcement 9 and the pillar outer 3 are cut off. 2 shows an example in which the front end joint portion is spot-welded W6 to the vertical surface of the front bulkhead 4. This is because there is a limit on the number of sheets that can be spot welded. The reinforcement 9 is fixed to the pillar inner 2 as described above, and the front and rear closed cross sections 10 and 1 are fixed.
1 makes it possible to minimize the offset in the vehicle width direction between the joint fixing portion of the rear end of the frame front bulk 5 to the vertical surface of the front bulkhead 4 and the closed cross-section portions 10 and 11, The collision load input from the frame front bulk 5 is efficiently transmitted from the closed cross sections 10 and 11 to the front pillar 1. Further, in the illustrated embodiment, a load transmitting bead portion 5a is formed at the rear end of the frame front bulk 5, and the load transmitting bead portion 5a allows the collision load to be more efficiently applied to the closed cross section 1a.
0 and 11 are transmitted. As described above, the closed cross section 10, which is formed in the vehicle longitudinal direction by the pillar inner 2 and the reinforcement 9 bonded and fixed thereto,
11, the mounting portion of the steering support beam 12 is reinforced and stiffened, and the collision load input to the frame front bulk 5 at the time of a vehicle collision efficiently reduces the closed section 1
0, 11 to the front pillar 1 and a closed cross section 10, 1 for stiffening the mounting portion of the steering support beam.
1 can greatly contribute to absorption and reduction of collision energy.

As described above, according to the present invention, the reinforcement for stiffening the mounting portion of the steering support beam, the pillar inner upper and the pillar inner lower constitute a pillar inner comple- ment, and the reinforcement By forming the closed cross-section in the vehicle longitudinal direction with the pillar inner upper, 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, and the collision load during a collision is reduced. Is efficiently transmitted from the frame front bulk to the closed cross section and the front pillar, and the stiffening means of the steering support beam attachment part can greatly contribute to the absorption and reduction of collision energy in the event of a vehicle collision. There is no need to add any special components for collision prevention, no increase in the assembly process, and cost reduction. I 俟, are those that can lead to practical use on a great deal of effect.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention, and is a schematic perspective view of a main part of a front pillar and a vehicle body in front of the front pillar.

2 (A) is a sectional view taken along line AA of the front pillar shown in FIG. 1, (B) is a sectional view taken along line BB of (A), and (C) is (A).
It is CC sectional drawing of.

FIG. 3 is a cross-sectional plan view showing an example of a conventional stiffening means for a steering support beam mounting portion.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 front pillar 2 pillar inner 3 pillar outer 4 front bulkhead 5 frame front bulk 5 a load transmitting bead 9 reinforcement 9 a bead 9 b flange 10 closed section 11 closed section 12 steering support beam 21 pillar inner upper 22 pillar inner lower

Claims (4)

[Claims] 1. A front pillar comprising a pillar inner and a pillar outer formed by connecting a pillar inner upper and a pillar inner lower, wherein a reinforcement is bonded and fixed to the pillar inner upper and the pillar inner lower. With the pillar inner upper, a closed cross-section along the joint between the pillar inner upper and the pillar inner lower is formed in the cross section of the front pillar,
The steering support beam is attached to the pillar inner stiffened at the closed cross section, and the front end of the front pillar is so arranged that the offset between the closed cross section and the rear end of the frame front bulk becomes extremely small. A front body structure of a vehicle, wherein the front body structure is connected to a vertical surface of a front bulkhead. 2. The vehicle body structure according to claim 1, wherein the reinforcement has a plurality of bead portions formed in a longitudinal direction of the vehicle, and the reinforcement is joined and fixed to a pillar inner lower. A front body structure of a vehicle, wherein a plurality of front-rear direction closed cross-sections are formed below the closed cross-section by a bead portion and a pillar inner lower of the reinforcement. 3. The vehicle body structure according to claim 1, wherein a buckling preventing flange is formed on an upper edge portion of the reinforcement in a bent manner. Front body structure. 4. The front body structure of a vehicle according to claim 1, wherein a collision load at the time of a collision is applied to a joint of a rear end portion of a frame front bulk and a vertical surface of a front bulkhead. A front vehicle body structure for a vehicle, comprising a load transmitting bead portion for transmitting a load to a front pillar via a head vertical surface.