JPS6135493Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of improving the rigidity of the front body of an automobile and increasing the natural frequency of the entire body.

This invention relates to a structure in which the front body structure of an automobile is integrated by welding the box-shaped structure of the front fender inner panel and dash panel, the rigid structure of the rocker panel, the front peeler, and the cowl side panel. In particular, this invention relates to a front body structure of an automobile in which a reinforcing panel as a brace is integrally welded to the oblique side of the cowl side panel, the front fender inner panel, and the front end of the rocker panel to form a closed cross section. be.

<Prior art> As is well known, when an automobile reaches a certain speed while driving normally, the steering wheel and front body may vibrate in the vertical direction, giving the occupants a sense of indecision. Not limited to road driving,
This often occurs when driving on rough roads with many uneven surfaces.

The vibrations are caused by low-frequency external forces such as the primary frequency of tire rotation due to poor tire assembly or eccentricity, which are applied to the front body, and external forces such as the uneven surface of a rough road as mentioned above may also be applied, causing the front body to resonate. It arises by doing.

This is because the body of an automobile has a certain natural frequency depending on design conditions such as shape and weight, and resonance occurs when the external force frequency and the natural frequency match.

The front body structure is part of the body structure that determines the natural frequency of the automobile body, and in particular, the rigidity of the joint structure of the front fender inner panel, dash panel, cowl side panel, and rocker panel is determined by the front body structure. They have a big relationship.

<Problem to be solved by the invention> In other words, in a normal automobile front body structure, the front fender inner panel and the darts panel have a box-shaped structure and have considerable rigidity;
The Rotsuka panel also has its Rotsuka inner panel and Rotsuka outer panel connected to the front pillar to strengthen the joint rigidity, but since the middle part of both structures is welded to the cowl side inner, the rigidity is weakened and it is directly susceptible to vibration generation. It had the disadvantage of having a low natural frequency involved.

In particular, this connection is weak in so-called frame cars,
To deal with this, the lack of rigidity is shared by the frame, but since the frame is also supported via a body mount, it is largely affected by the hardness of the body mount.

However, the hardness of body mounts is subject to regulations and restrictions from the viewpoint of noise, and as a result, it is difficult to expect an increase in the sharing of rigidity between the body and the body.

The purpose of this invention was to solve the problems of the automobile body structure based on the above-mentioned prior art as a technical problem to be solved, and to improve the joint rigidity on the body side, which cannot be solved even by body mounts. A reinforcing panel as a brace is connected to the front fender inner panel and the rocker panel along the cowl side panel, and the four parts are integrally welded to increase the joint rigidity. The purpose is to provide a front body structure for an automobile.

<Means/effects for solving the problems> In accordance with the above-mentioned purpose, the structure of this invention, which is summarized in the scope of the above-mentioned utility model registration claims, has a structure in which the darts panel of the box-shaped structure is welded to solve the above-mentioned problems. It is interposed between the front fender inner panel and the front end of the rocker panel, which are integrated by This is a technical measure that increases the vibration frequency to prevent resonance vibrations from occurring in the practical vehicle speed range due to low-frequency external forces such as tire eccentricity or external forces from uneven roads.

<Example> Next, an example of this invention will be described below based on the drawings.

1 is the frame of the front body of an automobile, and the cowl side panel 2 is the front part 3 and the edge 4
Dashboard panel 5 and front fender inner 6
The front fender inner 6 and the dash panel 5 are integrated with each other via spot welding 7, and the front fender inner 6 and dash panel 5 form a three-dimensionally connected structure.

A front pillar 8 is welded downwardly on the rear outer surface of the cowl side panel 2, and a rocker inner panel 10 to which a rocker outer panel 9 is integrally welded is fixed at the lower end.

Note that 11 is the front floor.

Reference numeral 12 denotes a reinforcing panel as a brace, which is the gist of this invention, and in this embodiment, like the lower part of the cowl side panel 2, it has a flat plate shape without any unevenness or curvature, and its upper front end is as shown in detail in FIG. To,
The flange 4 of the dash panel 5 is interposed between the cowl side panel 2 and the front fender inner panel 6 and are integrally fixed via spot welds 7, 7.

Further, the lower rear part of the reinforcing panel 12 is interposed between the rocker outer panel 9 and the rocker inner panel 10, as shown in detail in FIG.
3 and 14 are integrally connected by spot welds 7, 7, . . . , and the upper end portion is fixed to the rocker inner panel 10 by spot welds 7, 7, .

Thus, the upper oblique side 15 of the reinforcing panel 12 is the first
As shown in the figure, the lower oblique side 1 of the cowl side panel 2
It is integrally fixed to the flange portion 17 of 6 by spot welding 7, 7....

Therefore, as shown in the figure, the reinforcing panel 12 includes the cowl side panel 2, the front fender inner panel 6 of the box-shaped structure, and the rocker panels 9, 10.
are connected and bonded to form a rigid reinforced structure.

In the above structure, when the car is running, the front body structure has increased rigidity, so its natural frequency is higher than that without the reinforcing panel 12 as a brace, so the tires are mounted eccentrically. Even if a low-frequency external force such as the primary frequency of tire rotation or a low-frequency vibration external force due to an uneven road is applied, resonance will not occur.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiment, and various embodiments such as providing ribs on the reinforcing panel can be adopted.

<Effects of the invention> As described above, according to this invention, in the structure of the front body of an automobile, a reinforcing panel as a brace is provided at the part where the cowl side panel is connected to the front fender inner panel integrated with the box-shaped doss panel. By welding the reinforcing panel to the front fender inner panel, lower edge of the cowl side panel, and end of the rocker panel, the overall rigidity of the front body joint structure is improved, as well as the strength of the dash panel. The rigidity of the box-shaped cross-sectional structure of the front fender inner panel can also be increased, and the three-dimensional structure of the rocker panel can also be increased, which is an excellent effect.

Since the rocker outer panel and the rocker inner panel are clamped and connected to the flanges of the rocker inner panel and welded, the connection is better and the rocker inner panel has the effect of being able to withstand vibrations.

Furthermore, by increasing the rigidity of the front body coupling structure, the natural frequency of the front body of the automobile is increased, eliminating resonance with low frequencies caused by tire eccentricity, ensuring driving comfort, and reducing the vehicle speed at which resonance occurs. The excellent effect of being able to transfer the speed outside the practical vehicle speed is achieved.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of one embodiment of this invention, in which Fig. 1 is an overall schematic perspective view, Fig. 2 is a cross-sectional perspective view of Fig. 1, and Fig. 3 is an enlarged partial cutaway perspective view of part A in Fig. 1. It is. 1... Front body, 2... Cowl side panel, 5... Dash panel, 6... Front fender inner panel, 7... Welding, 9, 10...
Rocker panel, 12... Reinforcement panel (brace), 9... Rocker outer panel, 10... Rocker inner panel, 13, 14... Flange.

Claims (1)

[Scope of utility model registration request] The cowl side panel of the front body of an automobile is welded and integrated with the darts panel installed horizontally inside the body at the front of the body and the front fender inner panel extending forward, and is also welded and integrated with the rocker panel at the lower rear part. In this structure, a reinforcing panel serving as a brace has its front end connected and welded to the lower oblique side of the cowl side panel and the rear part of the front fender inner panel, and the reinforcing panel also connects the rear part to the rocker outer panel and the rocker inner panel. An automobile front body structure characterized in that the front body structure of an automobile is integrated by being sandwiched and connected by welding between both flanges of a panel.