JPH07137539A - Car body structure for automobile - Google Patents

Abstract

PURPOSE:To prevent an outer panel from being degraded in surface quality by forming a curvature before assembly into a normal curvature after assembly, CONSTITUTION:A part covering an area from the upper side of the handle installation section 18 of an outer panel 12 down to a belt line.20, is assigned as a stress imparting section 22, its curvature is set to be smaller than a normal curvature after assembly. A member having the normal curvature of the outer panel 12 is combined with an inner panel 14 by means of a roller heming process in advance, and subsequently the stress imparting section 22 is combined with the inner panel 14 by a roller heming process. By this constitution, surface distortion clue to combination will never take place in an area clown below the handle installation section 18 of the outer panel 12, and the outer panel 12 can thereby be prevented from being degraded in surface quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure of an automobile, and more particularly to a vehicle body structure of an automobile where stress is applied during use of the vehicle body.

[0002]

2. Description of the Related Art Conventionally, in a vehicle body structure of a portion where a stress is applied during use of the vehicle body, there is a problem that the weight of the vehicle body is increased because the strength is sufficiently high to withstand the applied stress.

As a method for improving this, a vehicle body structure of an automobile has been invented in which a predetermined stress for canceling a stress acting during use of the vehicle body is pre-distributed (Japanese Patent Application No. Hei 4).
-260231).

As shown in FIG. 9, in the vehicle body structure of this automobile, a door outer panel 70 having a curvature smaller than a regular curvature after assembly is set in a lower mold, and this door outer panel 70 is set in an upper mold 74. The door inner panel 76 having a curvature larger than the regular curvature after assembly is
Rear surface direction of the door outer panel 70 (direction of arrow F in FIG. 9)
From the front and rear end portions 70A of the door outer panel 70 and the front and rear end portions 7 of the door inner panel 76.
By connecting 6A and 6A by roller hemming, a predetermined stress that cancels the stress acting during use of the vehicle body is pre-distributed to the assembled door outer panel 70.

[0005]

However, in this vehicle body structure, the door outer panel 70 after assembly is installed.
The stress is distributed over the entire surface of the vehicle, and the stress is distributed to a portion where the stress hardly acts during the use of the vehicle body which does not require the stress distribution in advance. Therefore, according to this stress distribution, the door inner panel 76 and the door outer panel 70 after assembling may be corrugated, which causes a problem that the surface quality of the door outer panel 70 deteriorates.

In view of the above facts, the present invention has an object to obtain a vehicle body structure capable of preventing deterioration of the surface quality of the outer panel.

[0007]

According to a first aspect of the present invention, there is provided a vehicle body structure for an automobile, comprising: an outer panel in which a stress-applying portion for applying a predetermined stress after assembling has a curvature smaller than a normal curvature before the assembling. And an inner panel having a normal curvature before and after assembly and having both end edges fixed to the outer panel by roller hemming from the normal curvature side of the outer panel toward the stress applying portion. I am trying.

According to a second aspect of the present invention, there is provided the vehicle body structure according to the first aspect of the present invention, wherein both end edges of the outer panel are formed at the roller hemming portions of the stress applying portion of the outer panel. It is characterized in that the outer panel initial shape is given in advance before assembly so that a stress having an equal absolute value in the opposite direction to the surface strain between parts is generated.

According to a third aspect of the vehicle body structure of the present invention, the outer panel has a stress applying portion which gives a predetermined stress after the assembly before assembly and has a curvature smaller than the normal curvature, and before assembly. The inner panel is formed in a shape of a strip having a curvature larger than the normal curvature and is attached to a predetermined position between both end portions of the outer panel.

Further, in the vehicle body structure of an automobile according to a fourth aspect of the present invention, the stress applying portion for applying a predetermined stress after assembling constitutes a metal plate having a large coefficient of thermal expansion constituting the outer side and a heat constituting the inner side. An outer panel made of a clad material with a metal plate having a small expansion coefficient and having a normal curvature after assembling the stress applying portion in a heated state, and a normal curvature after assembling before the assembling. And an inner panel bonded with a curing adhesive.

[0011]

According to the vehicle body structure of the present invention as set forth in claim 1, only the stress applying portion for applying a predetermined stress after the outer panel is assembled is set to be smaller than the normal curvature in advance before the assembly. Both end edges of the inner panel, which has a normal curvature after assembly before assembly, are fixed to both end edges by roller hemming from the normal curvature side of the outer panel toward the stress applying portion. Therefore, on the regular curvature side of the outer panel, since the portion of the outer panel having the regular curvature and the inner panel having the regular curvature are coupled, no surface strain occurs. Therefore, a predetermined stress is applied only to the stress applying portion of the outer panel, and at the same time, it is possible to prevent deterioration of the surface quality of the outer panel.

In the vehicle body structure for an automobile according to the second aspect of the present invention, when both end edges of the stress applying portion are roller hemmed, a predetermined stress is applied to the stress applying portion of the outer panel and at the same time, Due to the displacement given to both edges of the outer panel before assembly, the force that cancels the surface strain between the edges of the outer panel acts between the edges of the outer panel, preventing the deterioration of the surface quality of the outer panel. can do.

In the vehicle body structure for an automobile according to the third aspect of the present invention, the stress applying portion for applying a predetermined stress after the assembly is installed at a predetermined position of the outer panel before the assembly and has a curvature smaller than the normal curvature. Before and after the assembly, the stress applying portion that applies the predetermined stress after the assembly is formed by adhering a strip-shaped inner panel having a curvature larger than the normal curvature, so that the predetermined location of the outer panel is accurately stressed. It is possible to accurately prevent the deterioration of the surface quality.

Further, in the vehicle body structure of an automobile according to a fourth aspect of the present invention, a metal plate having a large coefficient of thermal expansion constituting the outer side of the stress applying portion of the outer panel and a metal plate having a small coefficient of thermal expansion constituting the inner side. This outer panel is bonded with a thermosetting adhesive to the inner panel having a regular curvature after being assembled before being assembled. Therefore, in the heated state in which the outer panel and the inner panel are bonded, the stress applying portion has a normal curvature after assembly,
Since there are no stress points, the assembly can be done very easily. After that, when the outer panel and the inner panel return to room temperature, the coefficient of thermal expansion of the metal plate forming the outer side of the clad material is higher than the coefficient of thermal expansion forming the inner side.
A predetermined stress is applied to the stress applying portion after the assembly.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the vehicle body structure of an automobile according to the present invention will be described with reference to FIGS.

As shown in FIG. 3, the automobile front door frame 10 of this embodiment is composed of an outer panel 12, an inner panel 14, and a door frame 16.
The front edge 12A of the outer panel 12 and the front edge 14A of the inner panel 14, and the rear edge 12B of the outer panel 12 and the rear edge 14B of the inner panel 14 are joined by roller hemming. . Also,
The front edge 14A and the rear edge 14B of the inner panel 14
Has a normal curvature before being assembled to the outer panel 12.

As shown in FIG. 1, the curvature of the portion 12C below the door from the handle mounting portion 18 of the outer panel 12 is:
Before assembly, it has a normal curvature after being assembled with the inner panel 14.

On the other hand, the handle mounting portion 1 of the outer panel 12
A portion from the upper side of 8 to the belt line 20 is likely to be stressed by the occupant when the door is closed tightly, and it is necessary to give a stress to cancel this stress in advance. ing. The curvature of the stress applying portion 22 is set to be smaller than the normal curvature after assembly, and the front and rear end edges 22A and 22B of the stress applying portion 22 are provided on the inner panel 14 and the normal curvature side of the outer panel 12 (door From the lower side) toward the stress applying portion 22 side (upper side of the door) in the direction of arrow A in FIG.
When coupled as shown in FIG. 2, the stress applying portion 22 bends along the curvature of the inner panel 14 in the direction of the inner panel 14 (direction of arrow B in FIG. 1), and the imaginary line in FIG. With this state, a predetermined stress is distributed in the stress applying portion 22 in advance.

The operation of this embodiment will be described below. In the vehicle body structure of the automobile of this embodiment, it is not necessary to apply stress,
The outer panel 12 and the inner panel 14 are joined by roller hemming in the direction of arrow A in FIG. 1 from the portion 12C side below the handle attaching portion 18 of the outer panel 12 which has a curvature after being assembled in advance. . That is, a portion having a normal curvature of the outer panel 12 is first joined to the inner panel 14 by roller hemming, and then the stress applying portion 22 is roller hemming.
Since it is coupled to the regular curvature portion, that is, the surface distortion due to the coupling does not occur at the portion 14C below the handle mounting portion 18 of the outer panel 12, and the deterioration of the surface quality of the outer panel 12 can be prevented. it can.

Further, the stress applying portion 22 of the outer panel 12
Since the stress generated by the bending of the outer panel 12 during the use of the vehicle body and the stress canceling each other are distributed in advance, the apparent tension rigidity of the stress applying portion 22 of the outer panel 12 can be improved. As a result, when the tension rigidity is the same as the conventional structure, the plate thickness of the outer panel 12 becomes thin, and the weight of the front door frame 10 can be reduced.

Next, a second embodiment of the vehicle body structure for an automobile according to the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, as shown in FIG. 4, both front and rear edge portions 22 of the stress applying portion 22 of the outer panel 12 are arranged.
Each of the curvatures A and 22B is in the direction opposite to the surface strain direction after the assembling of the front-rear direction 22C, and the shape is derived by making the absolute values of the magnitudes equal to each other.

Therefore, by connecting both front and rear edges 22A and 22B of the stress applying portion 22 to the inner panel 14 by roller hemming, the back surface direction (arrow in FIG. 4) is provided between the front and rear directions 22C of the stress applying portion 22. The surface strain generated in the C direction) can be eliminated.

Therefore, when the stress applying portion 22 is subjected to the roller hemming, a predetermined stress is applied to the stress applying portion 22 and at the same time, a force for canceling the surface strain due to the roller hemming is applied to the front-rear direction 22C of the stress applying portion 22. Since it works, the deterioration of the surface quality of the outer panel 12 can be further prevented.

Next, a third embodiment of the vehicle body structure of an automobile according to the present invention will be described with reference to FIGS.

In the case of the same member as in the first embodiment,
The same reference numerals are given and the description thereof is omitted.

As shown in FIG. 5, in this embodiment, a strip-shaped front inner sub-panel 30 is adhered to the front edge 12A of the outer panel 12, and as shown in FIG. The outer panel 12 and the inner panel 14 are sandwiched between the front panel 12A of the outer panel 12 and the front panel 14A of the inner panel 14 at the roller hemming portion. Further, a portion of the front inner sub-panel 30 facing the stress applying portion 22 of the outer panel 12 has a curvature larger than a regular curvature after being assembled in advance.

As shown in FIG. 5, a rear inner sub-panel 3 having a strip shape is formed at the rear edge 12B of the outer panel 12.
2 is bonded to the rear inner sub-panel 32.
Although not shown, the rear edge 1 of the outer panel 12
2B and the rear edge 14B of the inner panel 14 at the roller hemming portion are sandwiched between the outer panel 12 and the inner panel 14. The portion of the rear inner sub-panel 32 facing the stress applying portion 22 of the outer panel 12 has a curvature larger than the regular curvature after the assembly in advance.

Therefore, before the inner panel 14 is assembled to the outer panel 12, the stress imparting portion 22 is attached to the front end edge portion 12A and the rear end edge portion 12B of the outer panel 12 having a curvature smaller than the normal curvature. The corresponding part is
Since the strip-shaped front inner sub-panel 30 and the rear inner sub-panel 32 each having a curvature larger than the normal curvature are adhered, the stress is accurately applied to the stress applying portion 22 of the outer panel 12, so that the surface quality of the outer panel 12 is deteriorated. Can be accurately prevented.

In place of the front inner sub-panel 30 and the rear inner sub-panel 32, as shown in FIG. 7, a portion of the outer panel 12 facing the stress applying portion 22 of the outer panel 12 is previously assembled in the central portion in the front-rear direction of the door. A strip-shaped center inner sub-panel 34 having a curvature smaller than the normal curvature after attachment may be adhered.

Next, a fourth embodiment of the car body structure of the present invention will be described with reference to FIGS. 8 (A) and 8 (B).

In the case of the same member as in the first embodiment,
The same reference numerals are given and the description thereof is omitted.

As shown in FIG. 8A, in this embodiment,
The stress applying portion 22 of the outer panel 12 is composed of a clad material 40 made of a metal plate having a large coefficient of thermal expansion forming the outer side and a metal plate having a small coefficient of thermal expansion forming the inner side. Further, a thermosetting adhesive 42 that is hardened by heating during coating is used for the hemming fixing portion between the outer panel 12 and the inner panel 14.

Therefore, in this embodiment, the outer panel 12
In the heated state in which the inner panel 14 and the inner panel 14 are adhered to each other, the stress applying portion 22 has a normal curvature after assembly, and there is no place where stress occurs during assembly, so assembly can be performed very easily. After that, the outer panel 12 and the inner panel 14
When and are returned to room temperature, the coefficient of thermal expansion of the metal plate forming the outer side of the clad material 40 is higher than the coefficient of thermal expansion forming the inner side, so a predetermined stress is applied to the stress applying portion 22 after assembly, In the stress applying portion 22, a tensile stress (arrow M in FIG. 8B) is generated on the outer side of the clad member 40. For this reason, it is possible to cancel the stress acting during use of the vehicle body and prevent deterioration of the surface quality of the outer panel 12.

In each of the above embodiments, the present invention is applied to the outer panel 12 and the inner panel 14 of the front door frame 10, but the present invention is applied to the front door frame 1
The present invention is not limited to the outer panel 12 and the inner panel 14 of 0, and can be applied to other parts such as a luggage door.

[0036]

According to the vehicle body structure of the present invention as set forth in claim 1, an outer panel in which a stress applying portion for applying a predetermined stress after assembling has a curvature smaller than a normal curvature before assembling, and Since the outer panel has a normal curvature after being assembled before and the inner panel has both end edges fixed by roller hemming from the normal curvature side of the outer panel to the stress applying part, the surface quality of the outer panel is improved. It has an excellent effect of being able to prevent the decrease of

According to the vehicle body structure of the present invention as set forth in claim 2, in the roller hemming portion of the stress applying portion of the outer panel, a stress having the same absolute value as the surface strain between the both end edges of the outer panel is generated. As described above, the displacement is given in advance before the assembly, and the outer panel has an initial shape. Therefore, it is possible to prevent the deterioration of the surface quality of the outer panel.

According to a third aspect of the present invention, the vehicle body structure for an automobile has an outer panel in which a stress applying portion for applying a predetermined stress after assembly has a curvature smaller than a normal curvature before assembly, and before assembly. Since the stress applying portion for applying a predetermined stress after assembling is formed into a strip shape having a curvature larger than the normal curvature and is bonded to the inner panel at a predetermined position between both end edges of the outer panel, the surface of the outer panel is formed. It has an excellent effect that the deterioration of quality can be prevented accurately.

According to a fourth aspect of the present invention, there is provided a vehicle body structure for an automobile, wherein a stress applying portion for applying a predetermined stress after assembly constitutes a metal plate having a large coefficient of thermal expansion constituting the outer side and a thermal expansion constituting the inner side. An outer panel made of a clad material with a small metal plate and having a stress-applied part with a normal curvature after assembly in the heated state, and a thermosetting adhesive with a normal curvature after assembly before assembly. Since the inner panel is adhered to the inner panel, it is possible to prevent the deterioration of the surface quality of the outer panel, and it is very easy to assemble the outer panel.

[Brief description of drawings]

FIG. 1 is a perspective view showing an assembled state of a front door frame to which a vehicle body structure according to a first embodiment of the present invention is applied.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a partial cross-sectional perspective view showing a front door frame to which a vehicle body structure according to a first embodiment of the present invention is applied.

FIG. 4 is a perspective view showing an outer panel of a front door frame to which a vehicle body structure according to a second embodiment of the present invention is applied.

FIG. 5 is a perspective view showing an outer panel of a front door frame to which a vehicle body structure according to a third embodiment of the present invention is applied.

6 is a sectional view taken along line 6-6 of FIG.

FIG. 7 is a perspective view showing an outer panel of a front door frame to which a vehicle body structure according to a modification of the third embodiment of the invention is applied.

FIG. 8A is a sectional view taken along line AA of FIG.
FIG. 6B is a perspective view of a front door frame to which a vehicle body structure according to a fourth embodiment of the present invention is applied.

FIG. 9 is a schematic cross-sectional view seen from the front of the front door frame, showing the assembly of the front door frame to which the vehicle body structure of an automobile according to the conventional example is applied.

[Explanation of symbols]

 10 Front Door Frame 12 Outer Panel 14 Inner Panel 22 Stress Applying Part 22A Front End Edge 22B Rear End Edge 30 Front Inner Subpanel 32 Rear Inner Subpanel 40 Clad Material 42 Thermosetting Adhesive

Claims (4)

[Claims] 1. An outer panel in which a stress applying portion for applying a predetermined stress after assembling before assembling has a curvature smaller than a normal curvature and an outer panel having a normal curvature after assembling before the assembling. An inner panel fixed by roller hemming from the regular curvature side of the outer panel toward the stress applying section. 2. The outer panel is preliminarily subjected to a displacement before assembly so that a stress having a same absolute value in a direction opposite to a surface strain between both end portions of the outer panel is generated in a roller hemming portion of a stress applying portion of the outer panel. The vehicle body structure according to claim 1, wherein the vehicle body structure has an initial shape. 3. An outer panel in which a stress applying portion for applying a predetermined stress after assembling in advance has a curvature smaller than a normal curvature before assembling, and a stress applying portion for applying a predetermined stress after assembling before the assembly is regular. An inner panel that is formed in a strip shape having a curvature larger than that of the outer panel and is adhered to a predetermined position between both end edges of the outer panel. 4. A clad member comprising a metal plate having a large coefficient of thermal expansion constituting the outer side and a metal plate having a small coefficient of thermal expansion constituting the outer side, and the stress applying portion for applying a predetermined stress after assembly and heating. In a state, the stress applying portion has an outer panel having a normal curvature after assembly, and an inner panel having a normal curvature after assembly in advance before assembly and bonded to the outer panel with a thermosetting adhesive. The body structure of an automobile characterized by.