JPS6341205Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for attaching a rear suspension of an automobile to a vehicle body frame.

Conventionally, the structure for attaching the trailing arm of a rear suspension to the vehicle body frame is as shown in FIG. A tip boss portion of a trailing arm 6 is swingably attached via a bush 5 to a support bolt 4 which extends between opposing walls and is fixed by screwing with a nut 7. In this case, the support bolt 4 is fixed by screwing into a nut 7 which is held and positioned by the operator, which not only takes time to assemble, but also causes damage to the space between the side sill 8 and the trailing arm bracket 3. In this case, a sufficient space is required to mount the nut 7, which limits the space for installing the side sill 8, resulting in a reduction in the structural strength of the side sill 8.

On the other hand, as shown in FIG. 2, a nut 9 to be threaded onto the support bolt 4 is fixed to the trailing arm bracket 3 by welding in advance, and by fixing it to the rear frame 2, the support bolt 4 can be attached. Some designs are designed to simplify the work, minimize the installation space for the nut 9, enlarge the cross-sectional shape of the side sill 8, and increase the structural strength of the side sill 8. However, in this case, since the nut 9 is fixed to the trailing arm bracket 3 in advance, if the center of the bolt insertion hole on the opposite wall of the trailing arm bracket 3 and the nut 9 is misaligned, the support bolt 4 and the nut 9 may become loose during assembly. There is a possibility that the nut 9 will not be screwed together properly, resulting in a defective installation condition or that the thread of the nut 9 will be damaged. Furthermore, if the nut 9 is damaged, it will be extremely difficult to replace it, and therefore, high precision is required for the assembled parts. There was a drawback.

The present invention has been developed in view of the above-mentioned points, and the nut to be screwed into the support bolt is held in the trailing arm bracket in advance to reduce the installation space and to simplify the installation work of the support bolt.
Another object of the present invention is to provide a mounting structure for a rear suspension in which a support bolt and a nut are screwed together accurately to prevent damage to the threads and loosening of the screws. The configuration of the rear suspension mounting structure of the present invention to achieve this purpose is as follows:
In a rear suspension mounting structure in which a trailing arm of a rear suspension is fixed to a trailing arm bracket fixed to a rear frame by tightening support bolts and nuts so as to be able to swing freely, a lid body is attached to the trailing arm bracket. A hollow space is formed between the trailing arm bracket and the lid body, and a nut portion having a threaded hole for screwing the support bolt in the space has a threaded hole provided therein, the outer edge of the nut part being non-rotatable within the space and having a threaded hole for the support bolt. It is characterized in that a nut body formed with a reinforcing flange portion that can be displaced in the radial direction is inserted.

An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 3 is a longitudinal cross-sectional view of a rear suspension mounting section in which the present invention is implemented, and FIG. 4 is an enlarged view of the main parts thereof. As in the past, a rear frame 2 is disposed on the lower surface of the rear floor 1, and a side sill 8 is located at the end of the rear floor 1. Further, a trailing arm bracket 3 that supports a support bolt 4 is fixed to the rear frame 2. The trailing arm bracket 3 has left and right opposing side walls 3.
a, 3b, and the outer (left side in the figure) side wall 3a is fixed to the side sill inner 8a to increase its rigidity. The left and right side walls 3a, 3b are provided with insertion holes for support bolts 4 at corresponding positions,
Further, an insertion hole is formed at a position corresponding to the side sill inner 8a. A lid body 10 is provided on the inner surface of the outer side wall 3a to cover the bolt insertion hole of the side wall 3a.
is fixed to form an approximately rectangular parallelepiped space therein, and a nut body 11 is inserted into the space between the side wall 3a and the lid body 10.
Load and hold.

FIG. 5 shows a perspective view of the lid body 10 and the nut body 11, and the lid body 10 has a rectangular box shape, and an insertion hole 10a for the support bolt 4 is bored in the center thereof. . The nut body 11 is formed by welding a nut part 11a with a threaded hole for screwing into the support bolt 4 to the center of a reinforcing flange part 11b having a rectangular outer shape smaller than the cover body 10. The nut body 11 is held between the side wall 3a and the lid 10 by fixing the lid 10 to the side wall 3a of the trailing arm bracket 3. Here, the outer dimensions of the reinforcing flange portion 11b of the inserted nut body 11 are as follows:
The screw hole of the nut part 11a is made to face the screw hole of the nut part 11a, and the nut body 11 can be moved in the radial direction of the support bolt 4 within the rectangular parallelepiped space to enable centering. The corner portion is dimensioned to abut against the lid body 10 and be blocked.

Then, the support bolt 4 is inserted from the inner side wall 3b of the trailing arm bracket 3, and the trailing arm 6 of the rear suspension is swingably attached via the bush 5, and the tip of the support bolt 4 is inserted into the nut of the nut body 11. It is screwed and fixed to the portion 11a.

In such a configuration, the trailing arm 6 is attached to the bush 5 and the trailing arm 6.
The support bolt 4 can be easily installed by simply aligning it with the bolt insertion hole, inserting the support bolt 4, and rotating it. That is, even if the center of the tip of the support bolt 4 is shifted when inserted into the nut portion 11a of the nut body 11, the nut body 11
Since it is held so that it can move in the radial direction of the support bolt 4, centering is automatically performed and the nut portion 11a and the support bolt 4 are correctly screwed together. Therefore, it is possible to naturally prevent the occurrence of damage or loosening of the screw threads due to poor screw engagement. Here, if the tip of the support bolt 4 is made sharp as shown in the figure, there is an advantage that centering with the nut body 11 can be performed more smoothly.

In the above embodiment, one side wall 3a of the trailing arm bracket 3 is attached to the side sill inner 8a.
However, in this invention, it is not essential to fasten the trailing arm bracket 3 and the side sill 8, and in some cases they can be separated. Also, the shapes of the reinforcing flange portion 11b of the cover body 10 and the nut body 11 are not limited to the rectangular shapes in the above embodiment, and may be any shape that does not allow them to rotate relative to each other.

As specifically explained above with reference to one embodiment, according to the present invention, the nut that is threadedly engaged with the support bolt for attaching the trailing arm of the rear suspension is attached to the trailing arm bracket in advance so that it cannot rotate and is attached to the support bolt. Since the nut is held so that it can be displaced in the radial direction, the installation space can be reduced compared to the case where the nut is provided separately, and the installation work of the support bolt is simplified. Centering is automatically performed when the bolt is inserted into the nut, and therefore, accurate threading between the support bolt and nut is easily ensured without requiring high precision from the assembled parts, preventing damage to the threads and screw threads. This can prevent loosening.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal cross-sectional views of conventional rear suspension mounting parts, Figures 3 to 5 relate to an embodiment of the present invention, and Figure 3 is a rear suspension in which the present invention is implemented. FIG. 4 is an enlarged view of the main parts, and FIG. 5 is a perspective view of the lid and nut body. In the drawing, 1 is the rear floor, 2 is the rear frame,
3 is a trailing arm bracket, 4 is a support bolt, 5 is a bushing, 6 is a trailing arm,
8 is the side sill, 10 is the lid body, 11 is the nut body,
11a is a nut portion, and 11b is a reinforcing flange portion.

Claims (1)

[Scope of utility model registration request] In a rear suspension mounting structure in which a trailing arm of a rear suspension is fixed to a trailing arm bracket fixed to a rear frame by tightening support bolts and nuts so as to be able to swing freely, a lid body is attached to the trailing arm bracket. A space is formed between the trailing arm bracket and the lid body, and a nut portion that is not rotatable within the space and has a threaded hole for screwing the support bolt in the space has a threaded hole in the space. A rear suspension mounting structure characterized in that a nut body formed with a reinforcing flange portion that is movable in the radial direction is inserted.