JPH03213474A - Front car body structure for automobile and assembling method thereof - Google Patents

Abstract

PURPOSE:To prevent bending of a coupled part and to ensure a load transmitting and cushioning action by coupling together a panel for supporting a bumper and a frame on the car body side on the same axis and locating a flat-plateform plate therebetween. CONSTITUTION:A nose unit comprising at least a bumper 41, a junction panel 33 for supporting the bumper, and a shroud panel 21 to which intercoupling rear end part is coupled is mounted on the front part of a car body provided on both sides with front side frames 13 of closed section structure. In this case, the rear end part of a junction panel 33 is coupled to the tip part of the front side frame 13 so that the two members are positioned on the same axis. A flat-plateform junction plate 34 is located therebetween togetherwith the shroud panel 21. This structure improves the strength of the coupled part and prevents bending of the coupled part during head-on collision, resulting in ensurance of a load transmitting and cushioning action.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a front body structure of an automobile and a method for assembling the same.

(Prior Art) Conventionally, on an automobile assembly line (main line), parts attached to the front of the car body, such as bumpers, radiator grilles, headlamps, and radiators, are attached to the car body.
The current situation is that the assembly lines have been individually assembled at separate stations, which increases the number of stations and therefore increases the length and complexity of the assembly line. Also,
In a mixed flow line that assembles a plurality of types of automobiles, a worker must judge whether or not to install each of the above-mentioned parts depending on the type of car, which poses a problem in terms of workability in particular.

Therefore, it is conceivable to form some of the above-mentioned attachment parts into units to facilitate work on the above-mentioned assembly line and to reduce the number of stations. In this case, since the unit is assembled separately, it is also advantageous in terms of mounting accuracy of each mounting part within the unit.

From such a point of view, for example, Japanese Patent Application Laid-Open No. 63-103771
As described in the publication, various parts such as a radiator, headlamps, bumpers, and radiator grilles are assembled into a unit by assembling them into a radiator core-the-boat, and this unit is assembled to the front part of the vehicle body. is proposed.

(Problem to be solved by the invention) However, in such a structure, the positional relationship between the bumper stay that supports the bumper and the front side frame is vertically shifted, so in the event of a frontal collision, etc., the input to the bumper is The load is not transferred to the front side frame, which has excellent strength, and has poor shock absorption.

The present invention has been made in view of the above points, and an object of the present invention is to provide a front body structure of an automobile and a method for assembling the same, which can ensure shock absorption in the event of a frontal collision without impairing bumper installation workability. The purpose is to

(Means for Solving the Problem) The invention of claim (1) provides a nose unit that includes at least a bumper, a square tubular junction panel that supports the bumper, and a shroud panel to which the rear end of the junction panel is connected. Assuming that the nose unit is assembled to the front part of the vehicle body which has left and right front side frames forming a closed cross-section structure, The shroud panel and the shroud panel are attached to each other so that the end portions of the side frames are coaxial with each other, and a flat junction plate is interposed therebetween along with the shroud panel.

In the invention according to claim (2), the nose unit has a cross member having a closed cross-section structure that extends in the left-right direction of the vehicle body and supports a lower portion of a heavy member such as a radiator.

According to the invention of claim (3), the junction panel is formed by joining an outer panel and an inner panel to each other, and a part of one of the two panels is extended downward to form a tie-down hook. There is.

In the invention of claim (4), a cross member having a closed cross-section structure extending in the left-right direction is provided between the left and right front side frames of the vehicle body, and the nose unit is provided with a cross member having a closed cross-section structure extending in the left-right direction between the left and right front side frames of the vehicle body, and the nose unit is configured by a bracket that protrudes from the junction panel and extends toward the center of the vehicle body. Supports heavy components such as radiators.

Further, in the invention of claim (5), the nose unit is configured of at least a square tubular junction panel that supports the bumper and a shroud panel to which the rear end of the junction panel is connected. , an assembly method for assembling to the front part of a vehicle body having left and right front side frames forming a closed cross-sectional structure, the back side of the shroud panel to which the rear end of the junction panel is connected, and the tip of the front side frame. The step of attaching a flat junction plate to either one of the junction panels is such that the rear end of the junction panel and the tip of the front side frame on the vehicle body side are on the same axis, and the rear end of the junction panel is and the front end of the front side frame are fastened together via the junction plate.

(Function) According to the invention of claim (1), the load input to the bumper is transmitted to the front side frame via the junction panel, the shroud panel, and the junction plate. At this time, since the junction plate increases the strength of the joint between the rear end of the junction panel and the front end of the front side frame, bending does not occur at the joint.

According to the invention of claim (2), a heavy member such as a heavy radiator is supported by a cross member having a closed cross-section structure and having excellent strength.

According to the invention of claim (3), the tie-down hook is formed by a part of the outer panel or the inch panel constituting the highly rigid rectangular cylindrical junction panel, and the rigidity of the tie-down hook is ensured.

According to the invention of claim (4), the rigidity of the front part of the vehicle body body to which the nose unit is assembled is increased by the cross member having a closed cross-section structure, and heavy members such as a heavy radiator are connected to a highly rigid junction. Supported by the panel via brackets.

According to the invention of claim (5), the rear end of the junction panel on the nose unit side and the front end of the front side frame on the vehicle body side are aligned on the same axis, and the rear end of the junction panel and the front end of the front side frame are connected to each other via a flat junction plate.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

In FIG. 1 showing the front part of an automobile, numeral 1 is an automobile, and a nose unit 3 is assembled to the front part of a main body 2 of the automobile. Front fenders 4, 4 are provided on the outside of both sides of the vehicle body 2, and a bonnet 5 is provided on the upper front side.

As shown in detail in FIG.
A front side frame 13.13 is joined to the lower side of 2.12, and a wheel apron reinforcement 14 is joined to the upper side of the wheel apron 12.12, creating a closed cross-section structure extending vertically in the longitudinal direction of the vehicle body. It is configured. A mounting flange portion 1 is provided at the front end of the wheel apron 12 and the front end of the front side frame 13.
．． 2a and 12b are formed. Furthermore, a mounting bracket 15 is fixedly installed on the upper side of the front side frame 13.

As shown in detail in FIGS. 3 and 4, the nose unit 3 is joined to the upper end portions of the shroud panels 21 and 21 to a shroud upper 22 extending in the left-right direction of the vehicle body. The shroud upper 22 includes a vertical wall portion 22A extending in the vertical direction, an upper wall portion 22B extending rearward from the upper edge of the vertical wall portion 22A, and a rear wall portion 22C extending downward from the rear edge of the upper wall portion 22B. A pair of vertical members 23, 23 are suspended from the center portion of the upper wall portion 22B in the left-right direction of the vehicle body. Note that the vertical members 23, 23 may be formed integrally with the shroud panel 21.21 and may be configured as a part of the shroud panel.

A cross member 26 having a closed cross-section structure extending in the left-right direction is installed at the lower end of the vertical member 23.23, in which an upper member 26A and a lower member 26B are joined. The cross member 26 has a support bracket 27.27 protruding from the rear side that supports the lower part of the condenser 24A and the radiator 24B, which are heavy members, and a support bracket 30.30 protruding from the front side that supports the lower part of the intercooler 51, which will be described later. has been done.

The capacitor 24A and the radiator 24B are integrally connected by a member not shown, and their lower ends are supported by support brackets 27 and 27 via rubber mount members 29A and 29B, and their upper ends are supported by a mounting bracket 28. .28 to the earthen wall portion 22B of the shroud upper 22 with bolts 25.

Further, as shown in detail in FIGS. 5 and 6, a rear end portion of a square cylindrical junction panel 33, which is made up of an outer panel 31 and an inner panel 32 joined to each other, is attached to the shroud panel 21. It is being The junction panel 33 is connected so that its rear end is coaxial with the tip 1 of the front side frame 13, and between them, together with the shroud panel 2, there are flat junction plates 1 and 34. is interposed.

The outer panel 31 constituting the junction panel 33 has fastening flange portions 31a at its front and rear ends.

It has a flat plate shape with 31b. In addition, inner panel 3
Reference numeral 2 denotes a side wall portion 32b that extends vertically parallel to the outer panel 31 and has a fastening flange portion 32a at the front end, and a clay wall portion 32d that extends from the upper edge of the side wall portion 32b toward the outer panel 31 side and has a fastening flange portion 32c at the rear end. A lower wall portion 32f extends from the lower edge of the side wall portion 32b toward the outer panel 31 and has a fastening flange portion 32e at the rear end, and a lower wall portion 32f extends vertically from the upper and lower walls 32d and 32f and
Joint flange parts 32g and 32h joined to the upper and lower edges of
It has a hat-shaped cross section. Above inner panel 3
The end of the upper panel 26A of the cross member 26 as well as the vertical member 23 is attached to the side wall portion 32b of No. 2 with bolts 35.3.
It is attached by 5. An end portion of the lower panel 26B of the cross member 26 is attached to the lower wall portion 32f of the inner panel 32.

Also, a set of three bolts 43, 4 are installed upright from the bumper reinforcement 42 to which the bumper 41 is bonded.
3.43 is the outer panel 3 of the junction panel 33
1 (the fastening flange portion 31a and the inner panel 3
The bumper 41 is fastened and fixed to the fastening flange portion 32a) of No. 2, thereby supporting the bumper 41 on the junction panel 33.

Both ends of the bumper 41 are connected to the bumper 41, respectively.
The mounting portion 4a of the front fender 4 of the vehicle body 2 is attached to the mounting portion 4a of the front fender 4 of the vehicle body 2 via a bolt (not shown) applied through the bolt 45.
The connection is fixed.

Further, the mounting portions 22b, 22b at both ends of the earth wall portion 22B of the shroud upper 22 are such that the nose unit 3 is attached to the vehicle body 2.
When the front fender 4 is attached to the front part of the front fender 4, the front fender 4 is attached to the mounting part 4b (front fender 4) with bolts 36 and 36.
) and the wheel apron reinforcement 14. At this time, nuts (not shown) are fixed to the inner surface of the wheel apron reinforcement 14 provided below the mounting portion 4b of the front fender 4 in correspondence with the bolts 36, 36.

51 is the intercooler, and the upper part is the mounting bracket 5
2. Vertical wall portion 22A of shroud upper 22 via 52
It is designed to be fastened with bolts 53 and 53.

Reference numeral 54 denotes a radiator grill located in the center of the front part of the automobile, and left and right mounting parts 54a, 54a are attached to the shroud upper 22.
The central mounting portion 54b is fitted into the mounting hole of the vertical wall portion 22A, and the central mounting portion 54b is fitted into the mounting hole of the vertical member 56 of the bonnet locking means 55. Numeral 57 is a bolt for fastening and fixing the fixture 58 of the bonnet locking means 55 to the front wall portion 22A of the shroud upper 22.

4 61A and 61B are left and right lamp units, and the upper end mounting portions 61a and 61a of each unit are attached to the vertical wall portion 22A of the shroud upper 22 by bolts 62, and the lower end attachment portions 61b are attached to the shroud panel 2 by bolts 63.
1 (the bolts 62 and 63 and the lower end mounting portion 61b are shown only for the lamp unit 61A). 64.65 are harnesses for connecting the electrical system, the former 64 is fastened to the cross member 26 via fittings 66.66 and bolts 67.67, and the latter 65 is fastened to the cross member 26 via fittings 68.68. Shroud upper 22
It is fitted and fixed into the mounting hole of the earthen wall part 22B. 71.71
is a buffer member when the bonnet 5 is opened, and is fitted and fixed to the upper wall portion 22B of the shroud upper 22.

Therefore, when assembling the front body of the above-mentioned automobile, the rear end of the junction panel 33 provided on the front nose unit 3 side that has been assembled is coaxial with the tip of the front side frame 13 on the body main body 2 side. This is done by positioning and attaching the nose unit 3 to the vehicle body 2 so that it is on a line. At this time, the flat junction plate 34 connects the front nose unit 3 to the vehicle body 2.
In the stage before assembly to the side, it is fixed to the back surface of the shroud panel 21 connected to the rear end of the junction panel 33 on the front nose unit 3 side, or fixed to the tip of the front side frame 13 on the vehicle body 2 side. do it.

In addition, when the front nose unit 3 and the vehicle body 2 are combined, this junction plate 3
4 and the rear end of the junction panel 33 via the shroud panel 21, a flange 32c formed along the surface of the shroud panel 2] and a mounting bracket 15 fixed to the tip of the front side frame 13.
The bolts 17 fixed to the flange portion 32c so as to extend in the longitudinal direction of the vehicle body are inserted into the bolt holes provided in the mounting bracket 15, and tightened with the nuts 18 from the back side of the mounting bracket 15. It is carried out.

Similarly, the fastening flange 31b provided at the rear end of the junction panel 33 is fastened and fixed to the mounting flange 12b of the wheel apron 12 provided at the tip of the front side frame 13 using bolts and nuts. It has become.

With the above configuration, the rear end of the junction panel 33 that supports the bumper 41 and the tip of the front side frame 13 are coupled so as to be on the same axis,
Since the strength of the joint is increased by the junction plate 34 located between them together with the shroud panel 21, the bending phenomenon does not occur at the joint in the event of a frontal collision, and the load input from the bumper 41 is transferred to the front side frame. 13, and the impact is effectively absorbed. Therefore, unitization does not impair frontal collision performance. In addition, since the strength of the joint is increased with a simple structure using the junction plate 34, the overall weight of the automobile 7 does not increase much, and the workability of assembling the nose unit 3 to the vehicle body 2 is not impaired. .

In addition, the radiator 24A1 is a heavy member.
Since the capacitor 24B and the intercooler 51 are supported by the highly rigid cross member 26 of the nose unit 3, their support rigidity can be ensured, and the workability of assembling them into a unit can be improved.

Since the above-mentioned junction panel has a rectangular tube shape made by joining two panels and has high rigidity, a part of one of the two panels can be extended downward to form a tie-down hook. You can also do it. That is, the seventh
As shown in FIGS. 9 to 9, a part of the outer panel 81 of a square tubular junction panel 83 formed by joining an outer panel 81 and an inner panel 82 is extended downward to form a tie-down hook 84. This makes it possible to ensure the rigidity of the tie-down hook 84. In addition to providing tie-down hooks 84, a tow hook 8 is also provided on the lower surface of the lower panel 86 of the cross member 85 that is joined to the lower wall of the inner panel 82.
7 can also be fixed.

Further, in the above embodiment, the cross member 26 with a closed cross section structure is provided for the nose unit 3, but as shown by the chain line in FIG. A member 91 is provided, and the cross member 91
If the left and right front side frames 13, 13 are joined together by the front side frames 13, 13, the rigidity of the front portion of the vehicle body 2 is ensured, and the positioning accuracy when inserting the nose unit 3 is ensured. In that case, as shown in FIGS. 10 and 11, the radiator 24 can be connected to the
If a heavy member such as B is supported, the radiator 2
The support rigidity of a heavy member such as 4B that requires support rigidity is not impaired.

In addition, the bumper reinforcement 9 of the bumper 94
A bracket 96 that protrudes rearward and supports the lower part of the intercooler 51 is attached to the bracket 5 . 9
7 is a shroud panel, and 98 is a shroud upper. In that case, the bracket 93A is also connected to the bumper reinforcement 95 for heavy members such as the radiator 24B.
It is also possible to protrude and support the lower part of the radiator 24B etc. with the two brackets 93 and 93A to further increase the support rigidity.

(Effects of the Invention) According to the invention of claim (1), the rear end of the junction panel supporting the bumper and the front end of the front side frame are coupled so as to be on the same axis, and the shroud is inserted between them. The strength of the joint is increased by the junction plate located with the panel, so even if a large load is applied to the bumper during a frontal collision, the joint will not bend and the load will be transmitted to the front side frame. , without impairing frontal collision performance. In addition, since the structure is such that the junction plate is simply interposed with the shroud panel between the rear end of the junction panel and the tip of the front side frame, the overall weight of the vehicle does not increase much, and the nose unit It does not impair assembly workability.

According to the invention of claim (2), since the heavy member such as the radiator is supported by the cross member having a closed cross-section structure, the supporting rigidity of the heavy member such as the radiator can be ensured.

According to the invention of claim (3), since the tie-down hook is formed by a part of the panel constituting the highly rigid rectangular cylindrical junction panel, the rigidity of the tie-down hook is ensured.

According to the invention of claim (4), since the left and right front side frames are connected by the cross member having a closed cross-sectional structure, the rigidity of the vehicle body body is ensured, and the positioning accuracy when inserting the nose unit is ensured.

Furthermore, since the heavy members such as the radiator are supported by the junction panel via the brackets, the supporting rigidity of the heavy members is not impaired.

According to the invention of claim (5), the rear end of the first junction panel on the nose unit side and the front end of the front side frame on the vehicle body side are arranged on the same axis, and both parts are arranged on the same axis. Since they are fastened via a flat junction plate, by unitizing the nose unit, a structure that can transmit the load from the bumper to the front side frame can be easily and easily assembled.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which FIG. 1 is a perspective view of the front of an automobile, FIG. 2 is a perspective view of the front of the vehicle body, FIG. 3 is a perspective view of a nose unit, and FIG. 4 is a perspective view of the front of the automobile. 5 is an exploded perspective view of the nose unit, FIG. 5 is a detailed view of the vicinity of the junction panel, and FIG. 6 is a sectional view of the main part after assembly. 7 to 9 show other embodiments, FIG. 7 is a similar view to FIG. 6 showing the state after assembly, and FIGS. 8 and 9 show tie-down hooks and FIG. 3 is a front view and a perspective view showing the state of the towing hook. 10th
The figure is a schematic sectional view showing still another embodiment, and FIG. 11 is a perspective view thereof. 2 ■...Car 2...Car body 3...Nose unit 13...Front side frame 21.97.
... Shroud panel 24B ... Radiator 26.91 ... Cross member 33.83.92 ... Junction panel 3
4... Junction plate 41, . 94・
... Bumper 81 ... Outer panel 82 ... Inner panel 84 ... Tie-down hook 93 ... Support bracket 3 4 Total Δ ・Clear Δ Ha All °(Tom't-to, X 〉, '(m
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Claims (1)

[Scope of Claims] (1) A nose unit is composed of at least a bumper, a square tubular junction panel that supports the bumper, and a shroud panel to which the rear end of the junction panel is connected; It is a structure that is assembled to the front part of a vehicle body having left and right front side frames forming a closed cross-section structure, and the rear end of the junction panel and the tip of the front side frame on the vehicle body side are on the same axis. 1. A front body structure for an automobile, characterized in that a flat junction plate is interposed between the shroud panel and the shroud panel. (2) The front body structure of an automobile according to claim (1), wherein the nose unit has a cross member having a closed cross-section structure that extends in the left-right direction of the vehicle body and supports a lower portion of a heavy member such as a radiator. (3) The junction panel is made up of an outer panel and an inner panel that are joined to each other, and a portion of one of the two panels extends downward to form a tie-down hook ( 1) or the front body structure of an automobile according to claim (2). (4) A cross member with a closed cross-section structure extending in the left-right direction is provided between the left and right front side frames of the vehicle body, and the nose unit is equipped with a bracket that protrudes from the junction panel and extends toward the center of the vehicle body to support heavy components such as radiators. The front body structure of a motor vehicle according to claim (1), which supports the front body structure of an automobile. (5) A nose unit is composed of at least a bumper, a square tubular junction panel that supports the bumper, and a shroud panel to which the rear end of the junction panel is connected, and the nose unit forms a closed cross-sectional structure. An assembly method in which front side frames are assembled to the front part of a vehicle body having left and right front side frames, wherein a flat plate is attached to either the back of the shroud panel to which the rear end of the junction panel is connected, or the tip of the front side frame. The process of attaching the junction plate of A method for assembling a front body of an automobile, the method comprising the step of: fastening the parts and parts together via the junction plate.