JPH0453346Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to the rear structure of an automobile body.

[Prior art]

Various types of structures around automobile frames and cross members have been devised in the past (see, for example, Japanese Utility Model Application Publication No. 157982/1982).

Figure 6 shows a conventional example of this, in which a side sill 2 runs longitudinally along the side of the vehicle at the rear of the vehicle.
(By combining the outer panel 3 and inner panel 4,
A rear frame 6 formed along the space (which forms a space with a closed cross section inside) is coupled to the rear frame 6 formed along the space. A cross member 8 that intersects and connects to the rear frame 6 is provided, and a rear floor 9 is stretched over the upper surfaces of the rear frame 6 and the cross member 8.

In this structure, the end 8a of the cross member 8
are brought into contact with the wall surface 6a of the rear frame 6 and are connected to each other, but due to the load that is applied during the operation of the vehicle, etc., the wall surface 6a of the rear frame 6 is pushed by the cross member 8, and the wall surface 6a of the rear frame 6 is bent as shown by the chain line. There was a problem that the strength and rigidity decreased due to cross-sectional displacement.

In addition, if the rear frame is arranged along the upper half of the side sill and its front part is directly connected to the stepped part of the rear floor, for example,
As shown in Publication No. 59-11971, the end of the cross member is brought into contact with the side surface of the side sill (corresponding to the inner panel 4 in FIG. 6) while keeping it in a generally general cross-sectional shape, and is joined. A structure has been proposed in which the upper edge of the cross member is connected to the front edge of the rear frame along the side sill (see FIGS. 5 to 7 of the above-mentioned publication).

[Purpose of invention]

This invention is intended to provide a rear body structure for an automobile that solves the above-mentioned problems.

[Structure of the idea]

This idea connects the lower flange part 20b of the rear frame 20, which is provided with a substantially L-shaped cross section, to the lower part of the side sill 12, and also connects the rear floor 25
is connected from the rear frame 20 to the upper part of the side sill 12 to form a closed cross section along the side sill 12, and the tip of the rear frame 20 of this closed cross section is connected to a cross member whose upper end is attached to the lower surface of the rear floor 25. The cross member 21 is formed with a step so as to enter the lower part of the cross member 21 at the intersection with the cross member 21, and is connected to the cross member 21.
Shoulder part 1 of the side sill 12 above the stepped part
2a, and a trailing link mounting bracket 26 of the rear suspension is fixedly attached from the lower surface of the rear frame 20 to the lower surface of the cross member 21 at this intersection. be.

〔Example〕

The details of this invention will be explained below with reference to the embodiments shown in FIGS. 1 to 5.

At the rear of the vehicle, there are side sills 12 (outer panel 13 and inner panel 14) that run longitudinally along the sides of the vehicle.
are connected by the upper mating flange part 16 and the lower mating flange part 17 to form a space with a closed cross section inside), a rear frame 20 is provided along this, and a rear frame 20 is provided along this space. A cross member 21 intersecting the frame 20 is provided.

The cross member 21 forms a stepped portion 23 with respect to the vehicle body floor, and a low-floor front floor 24 is stretched in front of the step portion 23, and the cross member 2 at the rear
A raised rear floor 25 is stretched over the upper surfaces of 1 and the rear frame 20. Note that a rear tire house 27 is provided behind the stepped portion 23 by cutting out the side sill 12.

Now, the rear frame 20 has a closed cross-section section 20a as its main body, and a flange section 20b extending from the closed section section 20a.
It is coupled to the lower mating flange portion 17 of the side sill 12 (FIG. 3). And as shown in Figure 5,
The rear frame 20 is formed with a step at a rising front end that intersects with the cross member 21 so as to be connected to the middle part of the cross member 21 and the front lower end part (see FIGS. 3 and 3). In Figure 5, the same parts of the front end of the rear frame 20 are indicated by A, B, and C, and the rear frame 20 in Figure 3 is expressed when viewed in the direction of the arrow in Figure 5.) .

Further, the cross member 21 mainly has a closed cross-section portion 21a, and has a flange portion 21b extending from the end thereof to the shoulder portion 12a of the side sill 12 (inner panel 14), which is connected to the shoulder portion 12a (third figure).
That is, the rear frame 20 and the cross member 21
At the intersection with the rear frame 20, the tip of the rear frame 20 is stepped so as to enter the lower part of the cross member 21, and is connected to the cross member 21. The frame 20 has a portion extending from the stepped portion of the frame 20 toward the upper surface of the shoulder portion 12a of the side sill 12, and is connected to the shoulder portion 12a of the side sill 12.

Furthermore, a trailing link mounting bracket 26 (trailing link 2) for the rear suspension is installed.
A bush 28 for rotatably supporting the mounting bracket 26 is provided.
is fixed to the rear frame 20 with mounting bolts 30, and is attached to the cross member 2 with mounting bolts 31.
It stays at 1.

[Effect of idea]

As mentioned above, this invention connects the rear frame to the side sills, and also extends the ends of the cross members to the upper surface of the shoulders of the side sills so that they can be connected to each other. The installed portion appears as if it were forming a partition wall on the cross-sectional restraint. Therefore, unlike the conventional example, there is no cross-sectional displacement in the rear frame, and the rear frame,
The joint rigidity of the cross member and side sills is significantly improved.

That is, compared to the conventional structure described above in which the end of the cross member is connected by abutting against the wall surface of the rear frame, in the present invention, the cross member and the side sill are connected by a wide surface in the vertical and longitudinal directions. Even with respect to lateral forces applied from the suspension side in the longitudinal direction of the cross member, these forces are transmitted from the middle stage of the cross member to the shoulders of the side sills, increasing rigidity. Similarly, compared to the conventional structure in which the upper edge of the cross member is connected to the front edge of the rear frame mentioned earlier, in this invention, the cross member and side sills are wider in the vertical and longitudinal directions. They are connected by surfaces and have high rigidity. Also, compared to any of the conventional structures, there is no part connected longitudinally to the abdomen of the rear frame or the abdomen of the side sill (inner panel), so even if lateral force is applied from the cross member side, this rear frame In addition, in the structure of the present invention, it is possible to restrict the movement of the side sill when it tries to twist at the portion extending from the middle stage of the cross member to the shoulder of the side sill. .

Furthermore, by fixing the trailing link mounting bracket for the rear suspension to the rear frame and cross member, this can be used as an auxiliary rigidity member, further increasing the joint rigidity.

By strengthening the joints between the rear frame, cross member, and side sills, vibration noise caused by road noise, etc. is reduced, and reliability in terms of strength is significantly improved.

[Brief explanation of the drawing]

1 to 4 show examples of this invention,
Figure 1 is a plan view of the rear body structure, Figure 2 is an enlarged plan view of section A in Figure 1, Figure 3 is a sectional view taken along line B-B in Figure 2, and Figure 4 is C-C in Figure 2. 5 is an explanatory view showing a rear frame, and FIG. 6 is an explanatory view showing a conventional cross member joint. 12...Side sill, 12a...Shoulder, 20...
...Rear frame, 21...Cross member, 21b
...Flange part, 26... Trailing link mounting bracket.

Claims (1)

[Claims for Utility Model Registration] The lower flange portion 20b of the rear frame 20, which has a substantially L-shaped cross section, is connected to the lower part of the side sill 12, and the rear floor 25 is connected to the upper part of the side sill 12 from the rear frame 20. Thus, a closed section along the side sill 12 is formed, and the tip of the rear frame 20 of this closed section crosses the cross member 21 at the intersection with the cross member 21 whose upper end is attached to the lower surface of the rear floor 25.
1, and is connected to the cross member 21, and the end of the cross member 21 extends from the stepped portion of the rear frame 20 to the upper side sill 12.
The trailing link mounting bracket 26 of the rear suspension is fixedly connected to the upper surface of the shoulder portion 12a of the cross member 21 from the lower surface of the rear frame 20 at this intersection to the lower surface of the cross member 21. The structure of the rear body of a car.