JP3321110B2 - Car body frame reinforcement structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for reinforcing a body frame of an automobile, and more particularly, to a structure for reinforcing a frame member made of sheet metal having a substantially U-shaped cross section in a longitudinal direction.

[0002]

2. Description of the Related Art A conventional vehicle body frame is disclosed in Japanese Patent Application Laid-Open No. 8-113165.

According to the above publication, the vehicle body frame includes a pair of left and right sheet metal frame members (side frames) extending long in the front-rear direction in plan view. A pair of side plates facing away from each other, a bottom plate integrally connecting the lower edges of the two side plates to each other, and an outward flange integrally formed on an upper edge of each of the side plates, and Each section has a substantially U-shaped cross section.

If the vehicle having the above configuration collides with some object such as another vehicle existing in front of the vehicle when traveling forward (hereinafter, this will be referred to as a "front collision"), the impact force at that time is reduced by the frame. It is provided from the front end of the member to the rear side along the longitudinal direction of the frame member.

[0005] Then, in general, the impact force causes a deformation of the frame members such that the respective side plates are separated from each other (hereinafter, this is referred to as "opening deformation"), and the respective side plates are viewed in plan. Deformation that bends in a zigzag shape (hereinafter referred to as “side plate deformation”) tends to occur.

In order to prevent the deformation of the frame member, there has conventionally been provided a reinforcing plate for connecting the left and right side plates to each other. This reinforcing plate is provided to prevent the "opening deformation". An upper reinforcing plate erected on the left and right outward flanges and connecting them to each other, and a lower reinforcing plate connecting upper and lower intermediate portions of the side plates to prevent the “side plate deformation” are provided. .

[0007]

By the way, in the above-mentioned prior art, since the reinforcing plate is composed of a plurality of members, that is, upper and lower reinforcing plates, the structure for reinforcing the frame member is complicated. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to achieve effective reinforcement of a frame member with a simple configuration.

[0009]

Means for Solving the Problems A reinforcing structure for a vehicle body frame of an automobile according to the present invention for solving the above problems is as follows.

According to the first aspect of the present invention, there is provided a frame member 16 made of sheet metal extending in one direction in a plan view, and the frame member 16 has a "line of sight" along its longitudinal direction.
A pair of side plates 17, 17 facing left and right apart from each other,
A bottom plate 18 for integrally connecting the lower edges of the side plates 17 and 17 to each other, and one
And a cross-section of each part in the longitudinal direction having a substantially U-shape.
In a vehicle body frame provided with a reinforcing plate 29 connecting the

The reinforcing plate 29 is mounted on the frame member 1.
6, in a longitudinal direction of the frame member 16, the auxiliary member having a wavy shape that alternately bends up and down as it advances in one direction.
The strong plate body 31 and the reinforcing plate body 3 viewed from the above “line of sight”
A pair of right and left extending integrally from each edge of 1 upward
From the upper edge of each side plate 32 and each side plate 32
An outward flange 33 integrally extending outwardly;
The provided, Rutotomoni a corrugated apexes 31a of the reinforcing plate 31 is positioned in the vicinity of the upper end of each portion of the frame member 16, the bottom 31b of the reinforcing plate 31
On the upper side of the frame member 16 at each side plate 17, 17
Of the frame member 1
6 and the outward flanges of the reinforcing plate 29.
The weld 33 is overlapped with the flange 33 and welded S2.
Each side plate 17 of the frame member 16 and each side of the reinforcing plate 29
The lower end of the plate 32 is overlapped and welded S3 .

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes an automobile, and an arrow Fr
Indicates the front. The left and right described below refer to the vehicle width direction toward the front.

The vehicle body 2 of the automobile 1 is a vehicle body frame 3
And a body 4 provided so as to cover the vehicle body frame 3 from above and supported by the vehicle body frame 3. The interior of the vehicle body 2 is a vehicle compartment 5. The vehicle body 2 is supported on a running surface 7 by front wheels 6 suspended from the vehicle body frame 3 via a suspension and rear wheels (not shown).

The body frame 3 is made of sheet metal and includes a main frame 10 and a sub-frame 11. The main frame 10 has a pair of side frames 12, 12 that are located left and right apart from each other.
Are located on each side of the vehicle body 2 and extend long in the front-rear direction. The left and right side frames 12, 12 are firmly connected to each other by a plurality of front and rear cross members 13, 13.

The above-mentioned left and right side frames 12, 12
Are symmetrical, so that the left side frame 12
Will be described only. The side frame 12 has a frame member 16 which is a halfway frame constituting a halfway portion of the side frame 12 in the front-rear direction.
The frame member 16 extends in the front-rear direction, which is one direction in plan view.

The frame member 16 is formed by press-molding a single sheet metal material extending long in the front-rear direction. A pair of side plates 17 facing each other at a slight distance to the left and right as viewed from a "line of sight" along the longitudinal direction. , 17 and each side plate 17 extends in the up-down direction. Further, the frame member 16 includes a bottom plate 18 for integrally connecting lower end edges of the both side plates 17, 17 to each other, and the bottom plate 18 extends substantially horizontally. An outward flange 19 is integrally formed on the upper edge of each side plate 17.
The frame member 16 includes the frame member 16,
Due to the side plate 17 and the bottom plate 18, each section in the longitudinal direction has a substantially U-shape.

On the upper surface of each outward flange 19 of the frame member 16, a floor panel 20 forming the lower surface of the vehicle compartment 5 is supported.

The frame member 16 constitutes a rear portion of the frame member 16 and extends substantially horizontally and substantially linearly. The frame member 16 constitutes a front portion of the same frame member 16 and one end of the horizontal member 22. Part (front end)
And a slant member 23 that extends almost linearly obliquely upward as the horizontal member 22 moves in the longitudinal direction and in a direction away from the front (forward). Further, the side frame 12 has a front frame 24 constituting a front portion of the side frame 12, and the front frame 24 faces forward from an extended end (front end) of the inclined member 23. Extends integrally.

A support bracket 27 made of sheet metal is firmly attached to the bottom of the inclined member 23 in a cross section in the middle in the longitudinal direction by spot welding S1. The sub-frame 11 is removably supported by fasteners 26 at the front end of the front frame 24 of the side frame 12 and the support bracket 27, and the front wheel 6 is suspended on the sub-frame 11. And an engine (not shown) for driving the vehicle is mounted.

A reinforcing plate 29 made of sheet metal is provided for connecting the pair of left and right side plates 17 of the frame member 16 to each other. The reinforcing plate 29 alternates vertically as the frame member 16 is viewed in a side view (a side view of the vehicle body frame 3 of the vehicle body 2) (FIG. 1), in one longitudinal direction (front-back direction) of the frame member 16. And a pair of left and right side plates 32 integrally extending upward from each edge of the reinforcing plate body 31 as viewed in the "line of sight". And an outward flange 33 integrally extending outward from each end edge of the reinforcing plate main body 31 as viewed in the "line of sight" through the side plate 32.

The reinforcing plate body 31 and the side plates 32 of the reinforcing plate 29 are fitted into the frame member 16 from above, and the outward flanges 33 of the reinforcing plate 29 and the frame members 16 Are bonded to each other and vertically overlap each other.

The reinforcing plate main body 31 is provided with wave-shaped tops 31a and bottoms 31b alternately along its longitudinal direction. When the frame member 16 is viewed from the side, each of the tops 31a is connected to the frame member 16a. Are located in the vicinity of the upper end of each part. More specifically, the tops 31a are located near the upper edges of the side plates 32 and below the outward flanges 33 extending from the upper edges. On the other hand, each bottom 31 of the reinforcing plate body 31
b is an upper side of the frame member 16 and each side plate 17,
17 is located in the middle of the vertical direction.

Each corrugated top 3 of the reinforcing plate 29
The portions near 1a and each bottom 31b are spot-welded S2 and S3 to the frame member 16, respectively. In this case, the portions in the vicinity of the top 31a are the outward flanges 33 of the reinforcing plate 29, and these outward flanges 33
And the floor panel 20 are overlapped with each other to form three sheets, which are integrally spot-welded.
2 has been done. Further, the portion near the bottom 31b is
The lower ends of the side plates 32 of the reinforcing plate 29 are connected to the lower ends of the side plates 32 of the reinforcing plate 29 and the frame members 16.
Side plate 17 is overlapped with each other to form a spot weld S3.
Have been.

According to the above configuration, the reinforcing plate 29 is formed so as to have a wavy shape that alternately bends up and down as it advances in one longitudinal direction of the frame member 16 in a side view of the frame member 16. Each corrugated top 31a of the reinforcing plate 29 is located near the upper end of each part of the frame member 16.

For this reason, each top 31a of the reinforcing plate 29
The sides join the upper ends of the left and right side plates 17, 17 of the frame member 16 to each other, so that even if an impact force is applied to the frame member 16 in the longitudinal direction during the "front collision", the frame member 16 16 "mouth opening deformation" is prevented. Also, the bottom 31b side of the reinforcing plate 29 is connected to the left and right side plates 1 of the frame member 16.
The upper and lower portions of the frame members 17 and 17 are connected to each other, so that even if an impact force is applied to the frame member 16 as described above, “side plate deformation” of the frame member 16 is prevented, and Reinforcement is effectively achieved.

The above-described effective reinforcement is achieved by a single reinforcing plate 29 having a corrugated shape, that is, a conventional technique in which a reinforcing plate for reinforcing the frame member 16 is composed of a plurality of members. Compared with the above, the above-described effective reinforcement of the frame member 16 is achieved with a simple configuration.

As described above, the portions of the reinforcing plate 29 near the corrugated tops 31a and the bottoms 31b are spot-welded to the frame member 16 by spot welding.
2, S3.

Here, at the time of "front collision", the frame member 1
When the element 6 is to be deformed by the impact force, a large stress tends to be generated in the vicinity of each of the top part 31a and each of the bottom parts 31b in the reinforcing plate 29, as described above.
Since the portions near the tops 31a and the bottoms 31b are spot-welded S2 and S3 to the frame member 16 and are firmly fixed to the frame member 16, the reinforcing plate 29 can sufficiently resist the above-mentioned stresses.

Therefore, the frame member 16 is effectively reinforced by the reinforcing plate 29, and its deformation is more reliably prevented.

Here, it is assumed that reinforcing plates are simply provided on the opposing surfaces of the left and right side plates 17 and 17 of the frame member 16 and each end of the reinforcing plate is spot-welded to an intermediate portion of each of the side plates 17 in the vertical direction. Then, at the time of “opening deformation” of the frame member 16, each of the side plates 1 is moved from the end of the reinforcing plate.
7 may be easily separated when trying to separate.

Therefore, as described above, the outward flanges 19 and 33 of the frame member 16 and the reinforcing plate 29 are joined to each other to perform spot welding S2. In order to perform the above, the outward flanges 19 and 33 hold the joined state to prevent peeling from each other. Therefore, the "opening deformation" of the frame member 16 is more reliably prevented.

At least a part (front end) of the reinforcing plate 29 in the longitudinal direction is formed by the frame member 16.
Are provided at a bent portion 35 which is a transition portion between the horizontal member 22 and the inclined member 23.

For this reason, when an impact force is applied to the frame member 16, stress concentrates on the bent portion 35 and tends to bend and deform relatively easily. Thereby, the stress concentration is prevented, and the bending deformation of the bent portion 35 is prevented.

[0035] The above is due to the illustrated example, the waveform of the upper Symbol the reinforcing plate 31 may be a trapezoid or rectangle in its side view.

[0036]

The effects of the present invention are as follows.

According to a first aspect of the present invention, there is provided a sheet metal frame member extending long in one direction in a plan view, and the frame member is provided with a pair of left and right faces facing each other when viewed in a line of sight along the longitudinal direction. Side plates, a bottom plate that integrally connects the lower edges of these side plates to each other ,
An automobile body frame provided with an outward flange integrally formed on an upper end edge, a cross section of each part in the longitudinal direction having a substantially U shape, and a reinforcing plate for coupling the both side plates to each other,

[0038] The reinforcing plate, in side view of the frame member, the reinforcing plate forming an alternating bending flex corrugated vertically accordance proceeds in the longitudinal direction of the one direction of the frame member,
Looking upward from each edge of the reinforcing plate body as viewed in the line of sight.
And a pair of left and right side plates extending integrally with each other,
Outside extending integrally from the upper edge toward the outside
And a inward flange, the frame Rutotomoni, each bottom of the reinforcing plate to each apex of the wave shape of the reinforcing plate is positioned in the vicinity of the upper end of each portion of the frame member
Located in the vertical direction of each side plate on the upper side of the arm member
And the outward flanges and reinforcing plates of the frame members
The outward flanges are overlapped and welded together.
Below each side plate of the frame member and each side plate of the reinforcing plate
The ends are overlapped and welded .

For this reason, each top side of the reinforcing plate main body of the reinforcing plate connects the respective upper end portions of the left and right side plates of the frame member to each other, and at the time of the "front collision", the frame member faces the longitudinal direction. Even if an impact force is applied, this “frame opening deformation” of the frame member is prevented. Further, each bottom of the reinforcing plate body of the reinforcing plate connects the middle portions in the vertical direction of the left and right side plates on the upper side of the frame member, and even if an impact force is applied to the frame member as described above. The "side plate deformation" of the frame member is prevented, and the reinforcement of the frame member is effectively achieved.

The above-mentioned effective reinforcement is achieved by a single reinforcing plate having a corrugated shape, that is, as compared with the conventional technique in which a reinforcing plate for reinforcing a frame member is composed of a plurality of members. Thus, the above-described effective reinforcement of the frame member is achieved with a simple configuration .

[Brief description of the drawings]

FIG. 1 is a partially enlarged partial sectional view of FIG. 2;

FIG. 2 is a side view of a front portion of a vehicle body of the automobile.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile 2 Body 3 Body frame 16 Frame member 17 Side plate 18 Bottom plate 19 Outward flange 29 Reinforcement plate 31 Reinforcement plate main body 31a Top 31b Bottom 32 Side plate 33 Outward flange

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazuhiko Imanita 2-1-1 Taoyuan, Ikeda-shi, Osaka Dai-Hatsu Kogyo Co., Ltd. (56) References JP-A-11-20744 (JP, A) JP-A-11-20744 JP-A-5-105110 (JP, A) JP-A-5-229452 (JP, A) JP-A-11-180336 (JP, A) JP-A-8-113165 (JP, A) , U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62D 25/20 B62D 21/15

Claims (1)

(57) [Claims] 1. A plan view, comprising a frame member made of sheet metal extending long in one direction, a pair of side plates facing left and right apart from each other when viewed in a line of sight along the longitudinal direction, and both sides thereof A bottom plate that integrally connects the lower edges of the plates to each other and an integral molding on the upper edges of the side plates
Is the outward flange and a generally U-shaped to the longitudinal direction of each unit section comprises a, in the body frame of an automobile provided with a reinforcing plate for coupling together the two side plates, the reinforcing plate, the frame member When viewed from the side, the reinforcing plate main body has a wavy shape that alternately bends up and down as the frame member advances in one direction in the longitudinal direction.
Extending upward from each edge of the reinforcing plate body.
A pair of left and right side plates protruding from the upper edge of each side plate.
Outward flanges that extend outward in one piece
With the door, when the apexes of the wavy shape of the reinforcing plate Ru is positioned in the vicinity of the upper end of each portion of the frame member
In both cases, each bottom of the reinforcing plate body is
At the upper side, position each side plate in the vertical
Each outward flange of the frame member and each outward flange of the reinforcing plate
The flange and the flange are overlapped and welded together, and
The lower end of each side plate of the arm member and the side plate of the reinforcing plate
Reinforcement structure of the body frame of the car, which is overlapped and welded .