JPH03208779A - Structure and assembly method for front body of automobile - Google Patents

Abstract

PURPOSE:To prevent a crimp of a junction frame at the time of head-on collision to secure the buffering property of a front side frame by inserting the tip of the front side frame into a junction panel supporting a bumper. CONSTITUTION:In an automobile, a nose unit not shown in a figure is assembled to the front of a car body. In this case, the nose unit is jointed with a shroud upper 22 expanding in the bilateral direction at the upper end of a shroud panel 21. On the other hand, the rear end of a rectangular-cylindrical junction panel 33, to which an outer panel 31 and an inner panel 32 are connected, is fitted to the shroud panel 22. The tip expansion part of a front side frame not shown in a figure is inserted into the junction panel 33. Furthermore, a bumper is supported by each fastening flange 31a, 32a of the junction panel 33.

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 the automobile assembly line (main line), parts attached to the front of the car body, such as bumpers, radiator grilles, headlamps, and radiators, were installed at separate stations for the car body. Because they were assembled individually,
The current situation is that the number of stations is increasing, which makes the assembly line longer and more complex. Furthermore, 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 particularly in terms of workability.

Therefore, it may be possible to unitize some of the above-mentioned attachment parts to facilitate work on the assembly line and reduce the number of stations. In this way, since the unit is assembled separately, it is advantageous in terms of mounting accuracy of each mounting part within the unit.

Therefore, from such a point of view, for example, JP-A-63-10
As described in Publication No. 3771, various parts such as a radiator, a headlamp, a bumper, a radiator grill, etc. are assembled to a radiator core support to form a unit.
It has been proposed that this unit be assembled to the front part of the vehicle body.

(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 transmitted to the front side frame, which has excellent strength, and causes the front side frame to bend.

The present invention has been made in view of the above points, and provides a front body structure of an automobile that can ensure workability through good assembly without impairing the shock absorption ability of the front side frame in the event of a frontal collision. The purpose is to provide an assembly method.

(Means for Solving the Problem) The invention according to claim (1) provides a structure in which a nose unit having at least a shroud panel is assembled to the front part of a vehicle body having left and right front side frames forming a closed cross-sectional structure. A bumper is supported by the shroud panel via a square tubular junction panel,
The front side frame is formed with a tip extension that passes through the shroud panel when the nose unit is attached to the vehicle body, and the tip extension of the front side frame is inserted into the junction 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 and supports a heavy member such as a radiator.

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

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. The invention of claim (5), which features a heavy member such as a radiator, is a method in which a nose unit having at least a shroud panel is assembled to the front part of a vehicle body having left and right front side frames forming a closed cross-sectional structure. The shroud panel supports the bumper via a junction panel having a closed cross-section structure, and the front side frame is formed with a tip extension that penetrates the shroud panel when the nose unit is attached to the vehicle body. The nose unit is assembled to the front of the vehicle body by inserting the end extension of the front side frame into the junction panel.

(Function) According to the invention of claim (1), the load input to the bumper is transmitted to the front side frame inserted into the junction panel. At this time, since the rigidity of the junction panel is increased by the extension of the front end of the front side frame, the junction panel does not bend.

According to the invention of claim (2), a heavy member such as a heavy radiator is supported by a cross member 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 inner 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 accuracy of the front part of the vehicle body to which the nose unit is assembled is ensured 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 bumper is supported by the shroud panel constituting the nose unit via the square tubular junction panel, and the front end extension of the front side frame passing through the shroud panel of the nose unit is connected to the junction panel. The nose unit is inserted into the panel and assembled to the front of the vehicle body.

(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 14.14 is joined to the upper side of the wheel apron 12.12, forming a closed section extending vertically in the longitudinal direction of the vehicle body. structure is constructed.

As shown in detail in FIGS. 3 and 4, the nose unit 3 is joined to a shroud upper 22 extending in the left-right direction of the vehicle at the upper end of a shroud panel 21.21. The shroud upper 22 includes a vertical wall portion 22A extending in the vertical direction, an earthen wall portion 22B extending rearward from the upper edge of the earthen wall portion 22A, and a rear wall portion 22C extending downward from the rear edge of the earthen 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. In addition, the said longitudinal member 23.23 may be formed integrally with the shroud panel 21.21, and may be comprised as a part of a shroud panel.

At the lower ends of the vertical members 23, 23, a cross member 26 having a closed cross-section structure is constructed by joining an upper member 26A and a lower member 26B. The cross member 26 has support brackets 27 and 27 protruding from the rear side that support the lower parts of the condenser 24A and the radiator 24B, and support brackets 28 and 28 which support the lower part of the intercooler 51, which will be described later, protrude from the front side.

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 mounting members 29A and 29B, and their upper ends are supported by a mounting bracket 30. Shroud upper 22 through .30
It is fastened by applying a bolt 34B to the upper wall portion 22B (nut 34A) (see FIG. 5).

Further, as shown in detail in FIG. 6, the shroud panel 21 has a rear end portion of a square cylindrical junction panel 33 formed by joining an outer panel 31 and an inner panel 32.

A tip extension portion 13a is inserted into the junction panel 33. The tip extension portion 13a is formed by extending the tip portion of the front side frame 13 and penetrates the shroud panel 22 in the attached state. Note that the distal end surface of the distal end extension portion 13a may be in contact with the bumper reinforcement 42, or a gap may be formed therebetween.

As shown in FIG.
At the same time, a bolt 36 is applied to a nut 35 fixed to the inner surface of the distal end extension part 13a, so that the distal end extension part 13a is fastened and fixed. The fastening is performed using a nut runner. That is, while holding the bolt 36 with the fastening member 37, the positioning member 38 is inserted into the positioning hole 3.
Positioning is performed by inserting the fastening member 3 into
The bolt 36 is screwed onto the nut 35 by rotating 7. 1. The outer panel 31 forming the junction panel 33 has fastening flange portions 31a at the front and rear ends.

It has a flat plate shape with 31b. In addition, inner panel 3
2 includes 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 mud wall portion 32e that extends from the upper edge of the side wall portion 32b toward the outer panel 31 and has a fastening flange portion 32c at the rear end. , a clay wall portion 32f extending from the lower edge of the side wall portion 32b toward the outer panel 31, and joining flange portions 32g, 32h extending vertically from the upper and lower walls 32e, 32f and joined to the upper and lower edges of the outer panel 31. It has a knot-shaped cross section. An end portion of the upper panel 26A of the cross member 26 is attached to the side wall portion 32b of the inner panel 32, together with the vertical member 23.

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, 43, 43, which are erected from the bumper reinforcement 42 to which the bumper 41 is bonded, are connected to the fastening flange portion 31a of the outer panel 31 of the junction panel 33 and the fastening flange portion of the inner panel 32. 32a, thereby supporting the bumper 41 on the junction panel 33.

Both ends of the bumper 41 have bolts 45, 45 erected from the bumper 41 and mounting holes 41 of the bumper 41.
It is also connected and fixed to a mounting portion 4a of a front fender 4 of the vehicle body 2 via a bolt (not shown) applied through a.

In addition, the mounting portions 22a, 22a at both ends of the earth wall portion 22B of the shroud upper 22 are attached to the front fender 4 in the attached state.
is superimposed on the upper side of the mounting portion 4b, and is fastened and fixed to the mounting portion 4b with bolts (not shown).

51 is the intercooler, and the upper part is the mounting bracket 5
2. Vertical wall portion 22A of shroud upper 22 via 52
Bolt 53. ．． 53.

Reference numeral 54 denotes a radiator 3 tag grill located at the center of the front part of the automobile, and the left and right mounting parts 54a, 54a are attached to the mounting holes in the vertical wall part 22A of the shroud upper 22, and the central mounting part 5
4b are adapted to be fitted and fixed into mounting holes of the vertical member 56 of the bonnet locking means 55, respectively. The bonnet locking means 55 is attached by fastening and fixing the fixture 58 to the vertical wall portion 22A of the shroud upper 22 using bolts 57 and 57.

Reference numerals 61A and 61B denote 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 62, and the lower end attachment portion 61b is 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 and 65 are harnesses for connecting the electrical system, and the former 64 is the attachment 66 and 66 and the port 1.
-67.67 to the support member 26, the latter 65 being fastened to the shroud upper 22 via fittings 68.68.
It is fitted and fixed into the mounting hole of the earthen wall part 22B. Reference numeral 71.71 is a buffer part shrine when the bonnet 5 is closed, and is fitted and fixed to the earthen wall part 22B of the shroud upper 22.

In order to assemble the front body of the automobile, the bumper 41 is supported by the shroud panel 21 via the junction panel 33 having a closed section structure, and the front side frame 13 is connected to the body 2 of the nose unit 3. A tip extension portion 13a is formed that passes through the shroud panel 21 in the attached state, and the front side frame 1
This is done by inserting the tip extension part 13a of No. 3 into the junction panel 33 and assembling the nose unit 3 to the front part of the vehicle body 2.

With the above configuration, the front side frame 13 is placed inside the junction panel 33 that supports the bumper 41.
Since the front end extension part 13a is inserted to increase the strength of the junction panel 33, bending phenomenon does not occur in the junction panel 33 in the event of a frontal collision.
The load input from the bumper 41 is reliably transmitted to the front side frame 153, and the impact is effectively absorbed.

Therefore, unitization does not impair frontal collision performance. Further, the junction panel 33 and the front end extension portion 13a of the front side frame 13 are connected by bolts 36.
Since the bolts are fastened from below, it is possible to use a nut runner or the like, which improves the fastening workability and ensures that the load is transmitted to the front side frame 13.

In addition, the heavy radiator 24A1 capacitor 24
Since B and the intercooler 51 are supported by the highly rigid cross member 26 of the nose unit 3, it is possible to improve the workability of assembly while ensuring their support rigidity.

The above-mentioned junction panel has a rectangular tube shape made by joining two panels and has high rigidity, so it is also possible to extend a part of one of the two panels downward to form a tie-down hook. can. That is, as shown in FIGS. 7 to 9, a part of the outer panel 81 of the injection panel 83, which has a closed cross-section structure and is formed by joining an outer panel 81 and an inner panel 82, is extended downward to form a tie. By configuring the down hook 84, the rigidity of the tie down hook 84 can be ensured. In addition to providing the tie-down hook 84, a tow hook 87 is fixed to the lower surface of the lower panel 86 of the cross member 85 joined to the lower wall portion of the inner panel 82. In addition,
The lower ends of the capacitor 24A and the radiator 24B are provided with a bracket 8 that protrudes rearward from the cross member 85.
8, the upper ends of which are supported by shroud uppers 90 joined to the upper ends of shroud panels 89.
directly supported by.

Further, in the above embodiment, the cross member 26 is provided for the nose unit 3, but as shown by the chain line in FIG. Left and right front side frames 1
3.13, the rigidity of the front part 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, if the radiator 24B and the like are supported via the support bracket 93 that protrudes inward from the junction panel 92, the radiator 24B and the like can be supported. There is no loss of rigidity. Further, a bracket 96 that supports the intercooler 51 is attached to the bumper reinforcement 95 of the bumper 94. 97 is a shroud panel, and 98 is a shroud upper.

In that case, a bracket 93A is also provided protruding from the bumper reinforcement 95 for the radiator 24B, etc., and the lower end of the radiator 24B, etc. is supported by the two brackets 93.93A to further increase the support rigidity. You can also.

(Effects of the Invention) According to the invention of claim (1), the front end extension of the front side frame is inserted into the junction panel that supports the bumper to increase the strength of the junction spring. Even if a large load is applied to the bumper at times, the junction panel does not bend, the load is transmitted to the front side frame, and frontal collision performance is not impaired.

According to the invention of claim (2), since the w-mounted 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. Ru.

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.

9 According to the invention of claim (5), the bumper is supported by the shroud panel constituting the nose unit via the junction panel having a closed cross-section structure, and the front end extension of the front side frame passing through the shroud panel is connected to the junction panel. Since the nose unit is assembled to the vehicle body by being inserted inside, the structure for transmitting the load of the bumper to the front side frame can be simply 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 cross-sectional view of main parts showing the state of final assembly, and FIG. 6 is a detailed view of the vicinity of the junction panel. 7 to 9 show other embodiments, FIG. 7 is a diagram similar to FIG. 5 showing the final assembly state, and FIGS. 8 and 9 show tie-down hooks and They are a front view 0 and a perspective view showing the state of the towing hook. FIG. 10 is a schematic sectional view showing still another embodiment, and FIG. 11 is a perspective view thereof. 1...Automobile 2...Car body 3...Nose unit 13...Front side frame 13a...
...Tip extension 2I...Shroud panel 24B...Radiator 26.91...Cross member 81...Bumper 33.83.92... ...junction panel 4
1.94...Bumper 81...Outer panel 82...Inner panel 84...Tie-down hook 93...Support bracket r'X All °(to L't-
-Ryo Hachi
Tomumi Sc-” (%, 7-m
All all herons 〉11 ka ji sea to he , ＼ ・clear ・＋f ,
X): tri-L Hajime Shin 1 ＼ 1
to , *(, &, p heart heart w house E
,
X ”< Tomo ＼ Tomi ±1
1 mouth sleep t+ :x [1,
飄 so 8 heart 8 ya "kal\kibo \shin he 7 (tame')

Claims (5)

[Claims] (1) A structure in which a nose unit having at least a shroud panel is assembled to the front part of a vehicle body having left and right front side frames forming a closed cross-sectional structure, and a square tubular junction panel is attached to the shroud panel. The bumper is supported through the front side frame, and the front side frame is formed with a tip extension that penetrates the shroud panel when the nose unit is attached to the vehicle body, and the tip extension of the front side frame is inside the junction panel. A front body structure of an automobile characterized by being inserted. (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 and supports a heavy member such as a radiator. (3) Claim (1) wherein the junction panel is formed by joining an outer panel and an inner panel, and a portion of one of the two panels extends downward to form a tie-down hook. 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 method in which a nose unit having at least a shroud panel is assembled to the front of a vehicle body having left and right front side frames forming a closed cross-section structure, the method comprising: attaching a junction panel to the shroud panel via a junction panel having a closed cross-section structure; While supporting the bumper, the front side frame is formed with a tip extension that passes through the shroud panel when the nose unit is attached to the vehicle body, and the tip extension of the front side frame is inserted into the inside of the junction panel. 1. A method for assembling a front body of an automobile, comprising: assembling a nose unit to a front part of a body.