JPS6220763A - Front structure of car body - Google Patents

Abstract

PURPOSE:To expand a space in which a radiator core is mounted, by connecting a connector member to both ends of a first cross member extending widthwise of a vehicle and a radiator core support side panel fixedly to the connector member. CONSTITUTION:Left and right radiator core support side panels 5A fixedly supported on the side of a connector member 8 outside a vehicle have flanges 5b inside the vehicle respectively, and the flange 5b is spot welded over the whole vertical portion to the side of the connector member 8 outside the vehicle. Above a first cross member 3 is a radiator core support upper rail 4 extending throughout the width of the vehicle, and both ends 4a of the rail 4 are spot welded to the upper surfaces of front ends of an upper flange 5c and a hood ridge panel 1 of a radiator core support side panel 5a.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a monocoque body structure for an automobile, and more particularly to a front body structure thereof.

-Prior Art- As is well known, the front part of a vehicle body of a general monocoque body structure is constructed as shown in FIGS. 4 and 5. Reference numerals 1.2 in FIGS. 4 and 5 indicate a hood ridge panel and a hood ridge reinforcement that extend in the longitudinal direction of the vehicle body, and in the front of these, there is a first cross member 3 that extends in the vehicle width direction, and a radiator core. The vehicle body front member comprising the support upper rail 4 and the radiator core support side panel 5 is joined. That is, at both ends i3a of the first cross member 3 disposed at the lower part of the vehicle body, the inner corner portions 5a of the radiator core support side panels 5, which are mounting members for headlamps (not shown), etc., are connected to small connector plates 6. The radiator core support side panels 5 are fixed to each other through the left and right end portions of the radiator core support 7 rails 4, which extend to the upper part of the vehicle body while remaining substantially parallel to the first cross member 3. The first cross member 3, the radiator core support side panel 5, and the radiator core support upper rail 4 are combined to maintain the overall surface rigidity of the front portion of the vehicle body. Note that reference numerals 7 in FIGS. 4 and 5 indicate left and right front side members extending in the front-rear direction along the inner lower part of the hood ridge panel l, and the front ends 7a of these front side members 7 are connected to the front bumper. (for example, "Automotive Engineering Handbook", Vol. 6, No. 1-7, published by Jidosha Gijutsu Zen).
(see page).

However, in such a vehicle front structure, a small connector plate 6 with poor rigidity is provided between the first cross member 3 and the radiator core support/side panel 5.
Since the radiator core support/side panel 5 is only connected via the Due to the presence of 6, first cross member 3. Radiator core support Φ side panel5. The inner dimensions of the space A surrounded by the radiator core support upper rail 4 became smaller, and only the small radiator octopus 7B could be mounted as shown in Figure 5. Since overall surface rigidity can only be obtained by connecting the upper parts of the panels 5 with the radiator core support/upper rail 4, the vehicle body consists of the first cross member 3, the radiator core support fist side panel 5, and the radiator core support/upper rail 4. After completing the underbody by joining the front part to the hood ridge panel 1,
It is necessary to have an engine, and for this need,
The complicated method of inserting the engine into the engine compartment from below the underbody is also used. In the conventional car body front structure mentioned above.

First cross member 3, radiator core support side panel 5, radiator core support upper rail 4
There are problems not only with the surface rigidity of the front part, which is made up of
Therefore, it is difficult to reliably transmit the impact force from the front of the vehicle body to the front side member 7 in the case of a frontal collision or the like.

A main object of the present invention is to provide a high surface rigidity of the front part of the vehicle body, and to ensure that the support state of the radiator core support and side panel to the first cross member is robust. The purpose of installing the radiator core is to obtain a front structure with more space. Another object of the second invention of Kimoto is to obtain a structure that can achieve the above-mentioned object and, moreover, can reliably transmit the impact force applied to the front part of the vehicle body to the front side member, which is a strength member.

Configuration of the Invention - In order to achieve this object, the present invention provides a first cross member extending in the vehicle width direction at the lower part of the vehicle body.
It is proposed to join the lower ends of a vertically extending, box-shaped connector member and to fix the radiator core support side panel to the outside of said connector member.

In the second aspect of the present invention, the lower end of a box-shaped connector member extending vertically is joined to both ends of a first cross member extending in the vehicle width direction at the lower part of the vehicle body, and the radiator core support side panel is connected to the connector. This is achieved by joining the front end of a front side member fixed to the outside of the member and provided along the inner lower part of the hood ridge panel to the outer surface of the lower end of the connector member.

-Embodiments- Hereinafter, details of embodiments of the present invention will be explained with reference to FIGS. 1 to 3.

FIG. 1, which shows a first embodiment of the present invention, is a perspective view corresponding to FIG. 5, which describes the conventional method, and the same structural parts as those in FIG. 5 are denoted by the same reference numerals. The feature of the first embodiment is that the radiator core support side panel 5A is supported using a connector member 8 whose lower end 8a is spot-welded to both left and right ends 3a of the first cross member 3. That is, the connector member 8 extends substantially vertically at the left and right ends 3a of the first cross member 3, and its horizontal cross section is a box-shaped closed cross section, thereby increasing the bending rigidity of the connector member 8 itself. . In addition, the left and right radiator core support fists/side panels 5A fixedly supported on the outside side of the connector member 8 have a fixing flange 5b folded at right angles on the inside of the vehicle. Connector member 8
It is spot welded to the outside side of the car. Above the first cross member 3, there is a radiator core support upper rail 4 that extends across the entire vehicle width direction, and both ends 4a of the radiator core support upper rail 4 are radiator core support side panels. It is spot welded to the upper flange 5C of 5A and the upper surface of the front end of the hood ridge panel 1, and is assembled as the front part of the vehicle body.
This radiator core support/upper rail 4 may be fixed to the upper flange 5C later with fixing bolts or the like.

Since the first embodiment has the above structure, the radiator core support side panel 5A has the lower end 1J18 a
is firmly fixed to the first cross member 3 via the connector member 8 having high bending rigidity, which is firmly fixed to the first cross member 13, so that high surface rigidity of the front part of the vehicle body can be obtained. Also, first cross member 3. Since the space A surrounded by the connector member 8 and the radiator core support/upper rail 4 is a completely rectangular opening, a large area radiator core B can be mounted therein. Then, attach the radiator core support/upper rail 4 to the radiator core support/side panel 5.
If the structure is to be attached to A, there is an advantage that the engine can be installed into the engine room from the front of the vehicle body with the radiator core support upper rail 4 removed.The connector member 8 is inserted through the connector member 8 in the vertical direction. Since it is made in a box shape, there are wires for headlamps etc. inside.
Electrical processing may be performed through a harness or the like.

FIG. 2 is an enlarged view of the lower end portion 8a of the connector member of the vehicle body front structure according to the embodiment of the second invention. In this embodiment, the connector member 8 fixed to both ends 3a of the first cross member 3 is shown in FIG. The front end portion 7a of the front side member 7 is firmly spot welded to the outer surface of the lower end portion of the front side member 7. Of course, the rear part of the front side member 7 whose front end 7a is closed by the closing plate 9 is extended along the inside surface of the hood ridge panel 1 and fixed to the hood ridge panel l, so that The external force due to the collision is applied to the first cross member 3. transmitted to the front side member 7 via the connector member 8;
It is transmitted from the front side member 7 to the entire vehicle body.

Therefore, according to the structure of this embodiment, in addition to the effects described in the first embodiment, there is an effect that the impact force applied to the front part of the vehicle body can be reliably transmitted to the front side and domain member 7, which are strength members. . FIG. 3 is an enlarged perspective view of the upper part of the vehicle body front structure according to the third embodiment of the present invention. In this embodiment, the radiator core support upper rail 4 that connects the radiator support side panel 5A is abolished. A horizontal connector brake (10) is used to connect the upper end of the connector member 8 and the upper surface of the front end of the hood ridge panel 1.

The inboard flange 10a of the horizontal connector plate 10, whose entire front end is fixed to the upper flange 5C, is spot welded to the outer surface of the upper end of the connector member 8, and the opposite outboard end 19b is attached to the hood ridge panel l and the hood ridge. Since it is connected to the upper surface of Reinforce 2, the overall surface rigidity of the front of the vehicle body is increased, and even if the radiator core support/upper rail 4 is abolished, high surface rigidity of the front of the vehicle body and joint rigidity as the underbody can be obtained. be able to. Of course,
It goes without saying that in this embodiment, the radiator core B may be attached using a radiator core support (upper rail 4A) as shown by the imaginary line and having the same length as the first cross member 3.

Effects of the Invention - As is clear from the above description, according to the present invention, the first cross member and the radiator core support/side panel are connected by a connector member having a box-shaped cross section.
A front body structure with high surface rigidity can be obtained, the space for installing the radiator core is larger, and the upper rail for supporting the radiator core can be assembled later, allowing the engine to be mounted from the front of the vehicle body into the engine room. can. Further, by fixing the front end portion of the front side member to the lower end portion of the connector member, there is an effect that the impact force acting on the front portion of the vehicle body can be reliably transmitted to the entire vehicle body.

[Brief explanation of drawings]

FIG. 1 is a partially exploded perspective view of a vehicle front structure according to a first embodiment of the present invention, and FIG. 2 is an enlarged perspective view of essential parts of a vehicle front structure according to a second embodiment of the present invention. , FIG. 3 is an enlarged perspective view of essential parts of a vehicle front structure according to a third embodiment of the present invention, FIG. 4 is a perspective view of a conventional underbody, and FIG. 5 is a partially exploded view of the same underbody. FIG. 2 is a perspective view of the front structure of the vehicle body. 3...First cross member, 4...Radiator core support upper rail 5.5A
...Radiator core support side panel, 7...Front side member, 8...Connector member. Patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Claims] 1) The lower end of a box-shaped connector member extending vertically is joined to both ends of a first cross member extending in the vehicle width direction at the lower part of the vehicle body, and the radiator core support
A vehicle front structure, characterized in that a side panel is fixed to the connector member. 2) Joining the lower ends of a box-shaped connector member extending vertically to both ends of a first cross member extending in the vehicle width direction at the lower part of the vehicle body, and fixing a radiator core support side panel to the connector member;
1. A vehicle front structure, characterized in that a front end portion of a front side member provided along an inner lower portion of a hood ridge panel is joined to an outer surface of a lower end portion of the connector member.