JP3066818B2 - Upper back structure of passenger car body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body, and more particularly to a structure around an upper back.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show an example of the structure around a passenger car body and its upper back. The upper back structure of the body includes an upper back panel 1, an upper back side bracket 2, an upper back reinforcement 3, and a roof side inner rear 4.

The rigidity of the body of this type of passenger car, especially around the upper back, ensures the assembling accuracy of the peripheral parts such as the rear window and the luggage, and reduces vibration noise or booming noise caused by vertical vibration of the upper back. It is extremely important in doing so. Conventionally, as a method of improving the rigidity around the upper back, there is known a method of increasing the thickness of components such as an upper back panel 1, an upper back side bracket 2, and an upper back reinforcement 3 (this method). Is referred to as measure A).

Further, spot welding 5 between the upper back panel 1 and the upper back side bracket 2 (FIG. 10)
(See, for example, measure B).

[0005]

However, in the conventional upper back structure, according to the method of increasing the plate thickness of the constituent members (measures A), the desired rigidity can be obtained, but the area around the upper back is not affected. There is a problem that the weight becomes considerably heavy. In addition, the measure B for increasing the number of welding points has a problem that sufficient rigidity cannot be ensured.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an upper back structure of a passenger car body capable of effectively improving rigidity without increasing weight.

[0007]

SUMMARY OF THE INVENTION An upper back structure of a passenger car body according to the present invention includes an upper back panel, an upper back side bracket, an upper back reinforcement, and a roof side inner rear. the composed, but in particular, constituted by an upper back side bracket and the upper back reinforcement
(1) A second reinforce is provided along the vertical direction outside the roof side inner rear corresponding to the position where the closed cross section abuts on the roof side inner rear, and the second reinforce and the leaf side inner rear provide the second closed. constitute a cross section, further, the lower end portion of the first closed section between the upper back side brackets and the upper back reinforcement, and the roof side inner rear joining the first closed section, and a second reinforcement, three sheets Is spot-welded.

[0008]

[0009]

According to the present invention, by providing the second reinforce outside the roof side inner rear, the rigidity of the mounting portion at the rear closed section of the upper back, that is, the closed section between the upper back side bracket and the upper back reinforce is provided. Can be strengthened. This suppresses the deformation of the roof side inner rear, so that the rigidity of the entire upper back structure can be improved.

In the above case, high joining rigidity between members can be secured by spot welding three predetermined positions of the upper back side bracket, the roof side inner rear and the second reinforce.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the upper back structure of a passenger car body according to the present invention will be described below with reference to FIGS.

FIG. 1 shows an example of a configuration around an upper back according to the present invention, and FIG. 2 shows an example of a configuration of a main part thereof. The upper back structure in the present embodiment includes an upper back panel 1, an upper back side bracket 2, an upper back reinforcement 3, and a roof side inner rear 4. In FIG. 1, 6 is a wheel house outer, 7 is a panel roof side outer, 8
Is a panel roof side inner.

In this embodiment, in particular, a second reinforce 9 is provided outside the roof side inner rear 4 along the vertical direction. This second reinforce 9
Has a thickness of about 0.7 mm, and corresponds to a position where a closed section S1 (see FIG. 3) constituted by the upper back side bracket 2 and the upper back reinforcement 3 abuts on the roof side inner rear 4. Provided.
The second reinforce 9 forms a closed section S2 with the roof side inner rear 4 as shown in FIG.

The second reinforcement 9 is joined to the roof side inner rear 4 by performing spot welding 10 at a plurality of locations outside the roof side inner rear 4 as shown in FIG. In this case, the upper back side bracket 2 and the upper back reinforcement 3
The lower end of the closed section S1 between the lower section, the roof side inner rear 4 joined to the closed section S1, and the second reinforce 9
In between, spot welding 10a and 10b are performed in three layers.

According to the present invention, by providing the second reinforce 9 outside the roof side inner rear 4, a rear closed section of the upper back, that is, a closed section S1 between the upper back side bracket 2 and the upper back reinforce 3 is provided. The rigidity of the mounting portion can be enhanced. As a result, the deformation of the roof side inner rear 4 is suppressed, so that the rigidity of the entire upper back structure can be improved.

For example, as shown in FIG. 6, in the conventional upper back structure, the deformation of the mounting portion of the rear closed cross section of the upper back is large, which causes a reduction in rigidity. That is, this portion was greatly deformed as shown by a dotted line in FIG. In contrast, in the case of the present invention, FIG.
, The amount of deformation is much smaller, as indicated by the alternate long and short dash line.

Next, an analysis example of the effect of the present invention performed using the finite element method will be described. FIG. 7 shows a model around the upper back for confirming the effect. When an upward load (tangential direction) is applied to the rear end portion 11a of the luggage door 11 in the over-open state of the luggage door 11, the judgment is made based on the magnitude of the deformation of the central portion of the rear end of the upper back. The target displacement δ is δ = 1.1 mm. In this analysis model, as shown in FIG. 8, the load F is directed upward with respect to the rear end 11a of the luggage door 11, that is, when the luggage door 11 is opened, the load F is tangential to the circle drawn by the rear end 11a. Shall be granted. The evaluation point P is set at the center of the rear end of the upper back as in the illustrated example.

The following Table 1 shows the calculation results of the above analysis model.

[0019]

[Table 1]

In Table 1, the units of displacement δ and weight increase are millimeter (mm) and gram (g), respectively.
It is. As is clear from this table, in the present invention, since the relatively thin second reinforce 9 having a plate thickness of about 0.7 mm is used, the weight increase around the upper back can be suppressed to a considerably low level. Moreover, the target displacement δ
= 1.1 mm, and the rigidity of the entire upper back structure can be increased as described above.

[0021]

As described above, according to the present invention, the rigidity can be effectively improved without increasing the weight around the upper back. In addition to improving the accuracy of assembling the luggage and the rear glass, the muffled sound in the room due to vibration around the upper back can be significantly reduced. Further, since the second reinforce is attached to the outside of the roof side inner rear, there is an advantage that the appearance can be secured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration example around an upper back in an embodiment of an upper back structure of a passenger car body of the present invention.

FIG. 2 is a perspective view showing a configuration example of a main part of an upper back structure of a passenger car body according to the present invention.

FIG. 3 is a sectional view taken along the line TT in FIG. 2;

FIG. 4 is a sectional view taken along the line UU in FIG. 2;

FIG. 5 is a side view in the direction of arrow V in FIG. 2;

6 is a cross-sectional view taken along the line ZZ of FIG. 2 showing a deformed state of a rear closed cross section of the upper back in the upper back structure of the passenger car body according to the present invention.

FIG. 7 is a perspective view showing a model around the upper back for confirming the effect by the finite element method in the upper back structure of the passenger car body according to the present invention.

FIG. 8 is a diagram illustrating a displacement state of an evaluation point in the model.

FIG. 9 is a perspective view of a passenger car body according to a conventional upper back structure.

FIG. 10 is an enlarged view of a portion A of FIG. 9 showing a main part configuration of a conventional upper back structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper back panel 2 Upper back side bracket 3 Upper back reinforce 4 Roof side inner rear 6 Wheel house outer 7 Panel roof side outer 8 Panel roof side inner 9 Second reinforce 10 Spot welding

──────────────────────────────────────────────────続 き Continued on the front page (56) References Japanese Utility Model 4-79777 (JP, U) Japanese Utility Model 3-17983 (JP, U) Japanese Utility Model 6-10079 (JP, U) Japanese Utility Model 4- 22377 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/08

Claims (1)

(57) [Claims] 1. A includes upper back panel and the upper back side bracket and upper back reinforcement and the roof side inner rear, the upper back structure of a passenger car body formed by combining these members with each other, the upper SL upper back side bracket a first closed section formed by the upper back reinforcement is in response to a position where it comes into contact with the roof side inner rear, the Le <br/>-safe side inner rear of the second and outer at the vertical direction annexed the reinforcement, and the second reinforcement
By the above roof side inner rear constitute a second closed section, the upper back side brackets and Appabakkuri
The lower end of the first closed section between the forces and this first closed
The roof side inner rear joined to the surface,
Two reinforces are spot welded in three layers
Upper back structure of a passenger car body, characterized in that the so that.