JPH0624310Y2 - Front body structure of automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a front body structure of an automobile, and in particular, an upper frame and a lower frame are arranged along the upper and lower sides of a wheel apron forming a side wall of an engine room. The present invention relates to a front vehicle body structure of an automobile having an installed vehicle body structure.

(Prior Art) The body of an automobile not only determines the shape of the entire vehicle but also supports the weight of the entire vehicle. Needless to say, sufficient strength and rigidity are required. Therefore, it is required to reduce the weight as much as possible. Therefore, various vehicle body structures have been conventionally proposed. For example, in the front part of the vehicle body, a front frame with a closed cross section that extends forward and backward along the lower inner part of the front wheel apron is arranged, and the rear end of this front frame is brought into contact with the dash panel that separates the vehicle interior from the engine room. There is a vehicle body structure that has been strengthened (for example, Japanese Utility Model Laid-Open No. 58-115468).

Furthermore, in addition to arranging the front frame along the inner lower part of the wheel apron as described above, a closed cross-section upper frame extending forward and backward along the upper part of the wheel apron is arranged (for this reason, the inner lower part of the wheel apron is arranged). The front frame along with is referred to as a lower frame), the upper frame and the lower frame are often used to strengthen the front body structure.

(Problems to be solved by the invention) If the above structure is adopted, the upper and lower parts of the wheel apron are reinforced by the upper frame and the lower frame, but the upper and lower parts of the wheel apron are independent of each other. Only strengthened, compared to the strength and rigidity of the upper and lower parts of the wheel apron, the strength and rigidity of the part between these parts is relatively low, so there is a problem that it is weak against vertical loads .

By the way, in general, when a vehicle collides head-on and the front portion of the vehicle body is contracted and deformed, a force for rotating the vehicle interior portion toward the front lower direction acts on the vehicle interior portion, or an upper frame or a lower frame. It is conceivable that a force in the direction of bringing the rear wall connecting parts of the engine room closer to each other will act on. At this time, if the strength and rigidity of the rear wall portion of the engine room, especially for the load in the vertical direction, are not sufficient, the rear wall portion is contracted and deformed in the vertical direction, so that the passenger compartment portion may bow ( It may be deformed so that the front part is crushed and the front part of the passenger compartment is lowered.

The present invention has been made in view of the above problems, and an object thereof is to enhance strength and rigidity of a rear wall of an engine room with respect to a vertical load, so that a vehicle interior portion bows when a vehicle crashes. It is to provide a front vehicle body structure that is prevented from being deformed.

(Means for Solving the Problems) In order to achieve the above object, a front vehicle body structure according to the present invention includes a wheel apron forming a side wall of an engine room located in a front portion of an automobile, and an upper portion of the wheel apron. An upper frame having a closed cross-section structure, which is joined to the upper part of the wheel apron and extends in the front-rear direction along the upper part and is connected to the rear wall of the engine room, and to the lower part of the wheel apron. A lower frame having a closed cross-section structure, which is disposed along the front-rear direction and is connected to the rear wall of the engine room, and is joined to the wheel apron, the rear wall of the engine room, the upper frame, and the lower frame. Together with the wheel apron and the rear wall of the engine room, one end is the upper frame and the other end is the lower frame. And a reinforcement forming a closed cross-section structure connected to the.

The rear wall of the engine room refers to a panel that constitutes a rear wall portion of the engine room, for example, a dash lower panel that separates the engine room from the vehicle compartment.

(Operation) According to the front vehicle body structure of the present invention, the reinforcement forms the closed cross-section structure extending in the vertical direction in the rear wall portion of the engine room, and one end of the closed cross-section structure is connected to the upper frame at the other end. Since it is connected to the lower frame, the rear wall of the engine room is effectively reinforced by being integrally connected to the upper frame, the lower frame, and the wheel apron through the reinforcement, and the rear wall of the engine room is effectively reinforced. It is possible to increase the strength and rigidity with respect to the vertical load. That is, more specifically, a vertically-closed closed cross-section structure formed by reinforcement is formed on the rear wall of the engine room, and the closed cross-section structure is integrally connected to the upper and lower frames. Therefore, the strength and rigidity of the rear wall of the engine room with respect to the vertical force is greatly improved, and even when the force acting in the direction of bringing the engine room rear wall connection parts closer to each other acts on the upper or lower frame, The closed cross-section structure by the force acts as a bar between the engine room rear wall connection parts of both frames, and as a result, the engine room rear wall connection parts of both frames are displaced toward each other after the engine room rear It is possible to prevent the shrinkage deformation of the wall.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an example of a front body structure according to the present invention, and FIGS. 2 and 3 are respectively arrows II in FIG.
-II and III-III are sectional views, which will be described below with reference to these drawings.

The front part of the vehicle body is disposed vertically in the vehicle width direction by a dash lower panel 5 as a rear wall of the engine room, which is arranged vertically and extends in the vehicle width direction. It is divided into the engine room 12 and the engine room. The side wall of the engine compartment 12 is formed by a wheel apron 1 arranged so as to cover the front wheel.
An upper frame 2 having a closed cross-section structure in which a pair of apron reinforcements 2a and 2b are joined and extend forward and backward on the side of the vehicle body.
Are formed. A suspension tower 3 to which a suspension supporting a front wheel is attached is attached to the wheel apron 1.
A lower frame 4 extending in the front-rear direction of the vehicle body is joined to a lower portion of an inner side surface of the wheel apron 1. Lower frame 4 is 2
It has a closed cross-section structure formed by joining the plate members 4a and 4b, and is strengthened by forming the closed cross-section, and the rear end is abutted and joined to the dash lower panel 5.

On the other hand, the cowl portion that supports the lower end of the windshield is formed by joining the cowl panel 7 and the dash upper panel 6. In this case, the cowl structure extending in the vehicle width direction is formed by joining the two panels 6 and 7, and the front windshield glass is supported by this structure. This cowl structure is an open cowl structure having an upper opening 8. Is. The upper end 5a of the dash lower panel 5 is joined to the dash upper panel 6,
The dash upper panel 6 also constitutes the rear wall of the engine room, and the upper frame 2 is connected to the dash upper panel 6. Furthermore, the upper frame 2
A reinforcement 10 that connects the lower frame 4 and the lower frame 4 is provided. As shown, the reinforcement 10 has its lower end 10a joined to the rear end of the lower frame 4 and extends along the surface of the wheel apron 1 from above to the outside at a substantially right angle. The upper outer end 10b thereof is joined to the upper frame 2 having a closed cross section, and both side portions 10c and 10d are joined to the wheel apron 2, the dash upper panel 6 and the dash lower panel 5, respectively. Therefore, as shown in FIG. 2, in the lower portion of the reinforcement 10, a closed cross-section structure extending vertically is formed by the reinforcement 10, the dash lower panel 5 and the wheel apron 1, and the outside of the reinforcement 10 is formed. In the upper part, the reinforcement 10, the dash upper panel 6, and the wheel apron 1 form a closed cross-section structure that extends outward in the vehicle width direction. Both of these closed cross sections are formed continuously, and one end of the closed cross section structure formed continuously is connected to the upper frame 2 and the other end is connected to the lower frame 4.
In this way, the reinforcement 10 forms a vertically extending closed cross-section structure in the dash lower panel 5 portion, and one end of the closed cross-section structure is connected to the upper frame 2 and the other end is connected to the lower frame 4 to form the upper frame 2.
The lower frame 4, the wheel apron 1, and the dash lower panel 5 are integrally connected to each other, so that the strength and rigidity of the dash lower panel 5 against the vertical load is enhanced. In the above embodiment, the reinforcement 10 is arranged in the engine room 12, but the reinforcement 10 is arranged outside the engine room 12, that is, on the side where the tires are located. The upper frame 2 and the lower frame 4 are joined to the dash lower panel 5 or the dash upper panel 6 which form the wheel apron 1 and the engine compartment rear wall from the outside of 12.
You may make it form the closed cross-section structure which connects with.

(Effects of the Invention) As described above, according to the present invention, the above-described reinforcement forms a vertically extending closed cross-section structure on the rear wall portion of the engine room, and one end of the closed cross-section structure serves as the lower frame. By connecting the other end to the upper frame, the strength / rigidity of the rear wall of the engine room can be increased, especially with respect to the load in the vertical direction, that is, the strength / rigidity of the rear wall of the engine room with respect to the vertical force can be increased. At the same time, it is possible to increase the strength and rigidity of the upper or lower frame, in particular, when the connecting portions of the engine room rear wall are displaced toward each other and the rear wall of the engine room is contracted and deformed in the vertical direction. It is possible to prevent the rear wall of the room from shrinking and deforming in the vertical direction, and It can be prevented from deforming like bowing.

[Brief description of drawings]

FIG. 1 is a perspective view showing a front vehicle body structure according to the present invention, and FIGS. 2 and 3 are sectional views taken along arrows II-II and III-III of FIG. 1, respectively. 1 …… Wheel apron 2 …… Upper frame 3 …… Suspension tower 4 …… Front frame 5 …… Dash lower panel 6 …… Dash upper panel 7 …… Cowl panel, 8 …… Upper opening 10 …… Reinforcement

Claims (1)

[Scope of utility model registration request] 1. A wheel apron forming a side wall of an engine room located in a front part of a vehicle body of an automobile, and a wheel apron joined to an upper portion of the wheel apron and extending in the front-rear direction along the upper portion. An upper frame having a closed cross-section structure connected to the rear wall of the room and a lower part of the wheel apron, which is arranged to extend in the front-rear direction along the lower part and is connected to the rear wall of the engine room. The lower frame having a closed cross-section structure, the wheel apron, the rear wall of the engine room, the upper frame and the lower frame are joined to each other so that one end together with the wheel apron and the rear wall of the engine room has the other end on the upper frame. And a reinforcement forming a closed cross-section structure connected to the lower frame. Front body structure for an automobile, characterized and.