JP2851341B2 - Vehicle front body structure and method of assembling the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a front vehicle body structure of an automobile.

2. Description of the Related Art Conventionally, in an automobile assembly line (main line), mounting parts such as a bumper, a radiator grill, a headlamp, and a radiator at a front part of a vehicle body are individually assembled to a vehicle body at separate stations. At present, the number of stations is increased, and the length of the assembly line is lengthened and complicated at present.
Further, in a mixed flow line for assembling a plurality of types of automobiles, an operator must determine whether or not to install the above-mentioned components in accordance with the type of the vehicle, which is particularly problematic in terms of workability.

Therefore, it is conceivable to unitize some of the above-mentioned attachment parts to facilitate the work on the assembly line and reduce the number of stations. With this configuration, the unit is separately assembled, which is advantageous in terms of the mounting accuracy of each mounting component in the unit.

Therefore, from such a viewpoint, for example, JP-A-63-1037
As described in Japanese Patent Publication No. 71, various components such as a radiator, a headlamp, a bumper, and a radiator grill are assembled into a radiator core support to form a unit, and this unit is assembled to a front portion of a vehicle body. It has been proposed.

(Problems to be Solved by the Invention) However, in such a structure, since the positional relationship between the bumper stay supporting the bumper and the front side frame is vertically shifted, the input to the bumper at the time of a frontal collision or the like. The load is not transmitted to the front side frame, which is excellent in strength, and causes a bending phenomenon.

The present invention has been made in view of the above circumstances, and provides a front vehicle body structure of an automobile that can ensure good assembling workability without impairing the shock absorption at the time of a frontal collision by a front side frame. The purpose is to do so.

(Means for Solving the Problems) The invention according to claim (1) is a structure in which at least a nose unit having a shroud panel is assembled to a front portion of a vehicle body having left and right front side frames forming a closed cross-sectional structure. A bumper is supported on the shroud panel via a rectangular tubular junction panel, and a front extension extending through the shroud panel is formed on the front side frame when the nose unit is attached to the vehicle body. The tip extension of the front side frame is inserted into the junction panel,
Between the left and right front side frames of the body,
A cross member having a closed sectional structure extending in the left-right direction is provided, and the nose unit is configured to support a weight member such as a radiator by a bracket protruding from the junction panel and extending toward the center of the vehicle body.

(Operation) 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. Moreover, the accuracy of the front portion of the vehicle body body to which the nose unit is assembled is ensured by the cross member having the closed cross-sectional structure, and a heavy member such as a heavy radiator is supported by the highly rigid junction panel via the bracket. . For this reason, the support rigidity of the weight member is not impaired.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1 showing the front of a car, 1 is a car,
A nose unit 3 is attached to a front portion of the vehicle body 2. Front fenders 4, 4 are provided outside the both sides of the vehicle body 2, and a hood 5 is provided above the front part.

As shown in detail in FIG. 2, the vehicle body 2 includes a wheel apron which forms left and right side walls of an engine room 11.
Front side frames 13, 13 are joined to the lower side of 12, 12, and wheel apron reinforcements 14, 14 are joined to the upper side of the wheel aprons 12, 12, so that the closed cross section extends vertically in the longitudinal direction of the vehicle body. The structure is configured.

As shown in detail in FIGS. 3 and 4, the nose unit 3 is joined to an upper end portion 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 has a vertical wall portion extending vertically.
22A and an upper wall 22B extending rearward from an upper edge of the vertical wall 22A.
And a rear wall portion 22C extending downward from the rear edge of the upper wall portion 22B, and a pair of vertical members 23 is hung from the center of the upper wall portion 22B in the left-right direction of the vehicle body. The above vertical member 2
The shrouds 3 and 23 may be formed integrally with the shroud panels 21 and 21 and may be configured as a part of the shroud panel.

At the lower end of the vertical members 23, 23, an upper member 26A is provided.
A cross member 26 having a closed cross-sectional structure in which the lower member 26B and the lower member 26B are joined is provided. The cross member 26 has support brackets 27, 27 for supporting the lower portions of the condenser 24A and the radiator 24B on the rear side, and support brackets 28, 28 for supporting the lower portion of the intercooler 51 described later projecting on 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, 27 via rubber mount members 29A, 29B.
The upper end is fastened by applying a bolt 34B to the upper wall 22B (nut 34A) of the shroud upper 22 via the mounting brackets 30, 30 (see FIG. 5).

As shown in detail in FIG. 6, a rear end portion of a rectangular tubular junction panel 33 formed by joining an outer panel 31 and an inner panel 32 is attached to the shroud panel 21. In the junction panel 33,
A tip extension 13 formed by extending the tip of the front side frame 13 and penetrating the shroud panel 22 in the mounted state.
a is inserted. In addition, the tip surface of the tip extension portion 13a is
It may be in contact with the bumper reinforcement 42, or a gap may be formed therebetween.

The tip extension 13a of the front side frame 13 is
As shown in FIG. 5, the bolt 36 is applied to the junction panel 33 from below by applying a bolt 36 to a nut 35 fixed to the inner surface of the tip extension 13a together with the lower panel 26B of the cross member 26 from below. It is fixed. The fastening is performed by using a nut runner. That is, while holding the bolt 36 with the fastening member 37, positioning is performed by inserting the positioning member 38 into the positioning hole 39, and the bolt 36 is screwed to the nut 35 by rotating the fastening member 37. Outer panel constituting panel 33
Reference numeral 31 is a flat plate having fastening flange portions 31a and 31b at front and rear ends. The inner panel 32 has a side wall portion 32b extending in the vertical direction parallel to the outer panel 31 and having a fastening flange portion 32a at a front end, and a fastening flange portion 32c extending from the upper end edge of the side wall portion 32b to the outer panel 31 side and a rear end. The upper wall 32e,
An upper wall portion 32f extending from the lower edge of the side wall portion 32b to the outer panel 31 side, and joining flange portions 32g, 32 extending vertically from the upper and lower wall portions 32e, 32f and joined to the upper and lower edge edges of the outer panel 31.
h is a cross-sectional hat shape. Inner panel 3 above
The cross member 26 along with the vertical member 23 is
The end of the upper panel 26A is attached. The end of the lower panel 26B of the cross member 26 is attached to the lower wall 32f of the inner panel 32.

Also, a set of three bolts 43, 43, 43 erected from a bumper reinforcement 42 to which a bumper 41 is bonded is connected to a fastening flange 31 a of the outer panel 31 of the junction panel 33 and a fastening flange 32 a of the inner panel 32. , Whereby the bumper 41 is supported by the junction panel 33.

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

The mounting portions 22a, 22a at both ends of the upper wall portion 22B of the shroud door 22 are attached to the mounting portions 4 of the front fender 4 in the mounted state.
It is superposed on the upper side of b and fastened and fixed to the mounting portion 4b by a bolt (not shown).

51 is an intercooler, the upper part of which is a mounting bracket 5
Bolt 5 to vertical wall 22A of shroud upper 22 through 2,52
3,53.

Reference numeral 54 denotes a radiator grill located at the front center of the vehicle, left and right mounting portions 54a, 54a are provided in mounting holes of the vertical wall portion 22A of the shroud door 22, and a central mounting portion 54b is provided on a vertical member 56 of the hood lock means 55. Are respectively fitted and fixed in the mounting holes. The bonnet lock means 55
7 and 57, the fitting 58 is attached to the vertical wall portion 22 of the shroud upper 22.
It can be attached by fixing it to A.

61A, 61B are left and right lamp units, and the mounting portions 61a, 61a at the upper end of each unit are attached to the vertical wall portion 22A of the shroud door 22 by bolts 62, 62, and the mounting portions 61b at the lower end are attached to the shroud panel 21 by bolts 63. The bolts 62 and 63 and the lower end mounting portion 61b are shown and fixed only for the lamp unit 61A. 64, 65 are harnesses for connection of an electric system, the former 64 is fastened to the support member 26 via mounting members 66, 66 and bolts 67, 67, and the latter 65 is through mounting members 68, 68 The shroud upper 22 is fitted and fixed in a mounting hole of the upper wall portion 22B. Reference numerals 71, 71 denote cushioning members when the hood 5 is closed, and are fitted and fixed to the upper wall portion 22B of the shroud upper 22.

In order to assemble the front body of the automobile, the shroud panel 21 has a junction panel having a closed sectional structure.
A front extension extending through the shroud panel 21 in a state where the nose unit 3 is attached to the vehicle body 2 while the bumper 41 is supported via the front side frame 13.
The nose unit 3 is mounted on the front part of the vehicle body 2 by inserting the front end extension 13a of the front side frame 13 into the inside of the junction panel 33.

According to the configuration described above, the distal end extension 13a of the front side frame 13 is inserted into the junction panel 33 supporting the bumper 41, and the strength of the junction panel 33 is increased. No bending phenomenon occurs, bumper 41
The input load is transmitted to the front side frame 13 reliably, and the impact is effectively absorbed. Therefore, the uniting does not impair the frontal collision performance. Also, junction panel 33 and front side frame
Since the front end frame 13 is fastened to the front extension 13a by a bolt 36 from below, the use of a nut runner or the like is possible, and the workability of the fastening is good, and the transmission of the load to the front side frame 13 is improved. It will be done reliably.

Further, since the heavy radiator 24A, condenser 24B, and intercooler 51 are supported by the cross member 26 of the nose unit 3 having high rigidity, it is possible to improve the assembling workability while securing the supporting rigidity thereof. .

Since the junction panel has a high rigidity in a rectangular tube shape formed by joining two panels, a part of one of the two panels may be extended downward to form a tie-down hook. it can. That is, the seventh
As shown in FIG. 9 to FIG. 9, a part of the outer panel 81 of the in-junction panel 83 having a closed cross-sectional structure formed by joining the outer panel 81 and the inner panel 82 is extended downward to connect the tie-down hook 84. With this configuration, the rigidity of the tie-down hook 84 can be ensured. Further, in addition to providing the tie-down hook 84, a traction hook 87 is fixed to the lower surface of the lower panel 86 of the cross member 85 joined to the lower wall of the inner panel 82. The lower ends of the condenser 24A and the radiator 24B are cross members.
Although supported by a strip bracket 88 projecting rearward from 85, their upper ends are directly supported by a shroud upper 90 joined to the upper end of a shroud panel 89.

In the above embodiment, the cross member 26 is provided for the nose unit 3. However, as shown by a chain line in FIG. 2, a cross member 91 is provided on the vehicle body 2 side. By connecting the front side frames 13, 13, the rigidity of the front portion of the vehicle body 2 is ensured, and the positioning accuracy when the nose unit 3 is inserted is ensured. In this case, as shown in FIGS. 10 and 11, if the radiator 24B and the like are supported via a support bracket 93 protruding inward from the junction panel 92 to the vehicle body, the radiator 24B and the like can be supported. There is no loss in rigidity. In addition, the bumper reinforcement 95 of the bumper 94 has a bracket for supporting the intercooler 51.
96 are installed. 97 is a shroud panel and 98 is a shroud upper. In that case, the bracket from the bumper reinforcement 95 for the radiator 24B etc.
The lower end of the radiator 24B or the like may be supported by the two brackets 93, 93A, and the support rigidity may be further increased.

(Effect of the Invention) According to the invention of claim (1), the strength of the junction panel is increased by inserting the front end extension of the front side frame into the junction panel that supports the bumper, so that the front panel can be used in the event of a frontal collision. Even if a large load is input to the bumper, no bending phenomenon occurs in the junction panel, the load is transmitted to the front side frame, and the frontal collision performance is not impaired. And
Since the left and right front side frames are connected by the cross member having the closed cross-sectional structure, the rigidity of the vehicle body is secured, and the positioning accuracy when the nose unit is inserted is secured. In addition, since the weight member such as the radiator is supported on the junction panel via the bracket, the support rigidity of the weight member is not impaired.

[Brief description of the drawings]

1 is a perspective view of a front part of a vehicle, FIG. 2 is a perspective view of a front part of a body of the vehicle, FIG. 3 is a perspective view of a nose unit, and FIG. FIG. 5 is an exploded perspective view of the nose unit, FIG. 5 is a sectional view of a main part showing a final assembled state, and FIG. 6 is a detailed view around a junction panel. 7 to 9 show another embodiment, FIG. 7 is a view similar to FIG. 5 showing a final assembled state, and FIGS. 8 and 9 are tie-down hooks and tow for a junction panel. It is the front view and perspective view which show the state of a hook. FIG. 10 is a schematic sectional view showing still another embodiment,
FIG. 11 is a perspective view of the same. 1 ... Automobile 2 ... Body body 3 ... Nose unit 13 ... Front side frame 13a ... Extended tip 21 ... Shroud panel 24B ... Radiator 26,91 ... Cross member 31 ... Bumper 33,83, 92 Junction panel 41,94 Bumper 81 Outer panel 82 Inner panel 84 Tie-down hook 93 Support bracket

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kuniaki Takahara 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Kosuke Murakami 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Matsu (72) Inventor Takashi Kitayama 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (56) Reference: Japanese Utility Model laid-open 3-78656 (JP, U) Japanese Utility Model 1987-106875 ( JP, U) Japanese Utility Model Showa 56-91169 (JP, U) Japanese Utility Model Showa 58-56654 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B62D 25/08, 65/00 B60K 11/04

Claims (1)

(57) [Claims] 1. A structure in which a nose unit having at least a shroud panel is assembled to a front portion of a vehicle body having left and right front side frames forming a closed cross-sectional structure, wherein a rectangular cylindrical junction is formed on the shroud panel. A bumper is supported via a panel, and a front extension extending through the shroud panel when the nose unit is attached to the vehicle body is formed on the front side frame, and the front extension of the front side frame is formed of a junction panel. Inserted inside, between the left and right front side frames of the vehicle body,
A cross member having a closed sectional structure extending in the left-right direction is provided, and the nose unit is configured to support a weight member such as a radiator by a bracket protruding from the junction panel and extending toward the center of the vehicle body. Body structure of the car.