JPS5934484Y2 - Trailing arm mounting structure - Google Patents

Description

[Detailed description of the invention] This invention relates to a mounting structure for a trailing arm. In particular, the trailing arm mounting bracket is also used as a connecting member for each member of the vehicle body stationary member, and the supporting rigidity and rigidity of the trailing arm are improved. The purpose is to improve the joint rigidity of each member.

In suspensions using trailing arms, the structure is generally such that the trailing arm, on which a large load acts, is indirectly connected to a highly rigid vehicle body frame.

For example, in the past, suspension members with a hat-shaped cross section were integrally connected in a cross-like manner by facing a cross member installed between the side members on the outside of the side members arranged longitudinally on both sides of the vehicle body. Two suitable support brackets are integrally attached to the rear side by welding or screwing, and the rear attachment part of the trailing arm is attached to each support bracket so as to be swingable.

However, with the above mounting structure, the trailing arm is directly attached to the suspension member via the support bracket, and the load from the trailing arm acts on the suspension member via the support bracket. There have been various problems mainly in the joints between the support bracket and the suspension member and the joints between the suspension member and the side members.

In other words, since the suspension supports the weight of the vehicle and receives reaction forces from the road surface, a fairly large load will be applied to the trailing arm, and the rigidity of the support bracket and suspension member that will receive the load will be affected. In addition, it is necessary to increase the rigidity of the joint between the support bracket and the suspension member and the joint between the suspension member and the side member.

However, in the former case, although it is sufficient to increase the size of each part or increase the wall thickness, there is a drawback that the material cost is high and the weight is heavy.

In the latter case, it is not possible to make a large welding area, and in particular, to connect the suspension member and side member, a joining flange is formed on the end face of the suspension member, and this joining flange is brought into contact with the side of the side member and fixed by welding. Therefore, it was not possible to increase the joint strength very much, and the supporting rigidity of the trailing arm was low.

In view of the above-mentioned conventional drawbacks, this idea has been improved and eliminated, and the bracket attached to the inside of the trailing arm is also used as a connecting member for the suspension member, side member, and cross member, thereby making it possible to improve the trailing arm. It has improved support rigidity.

Hereinafter, the configuration of this invention will be explained according to the embodiments shown in the drawings.

Figure 1 is a drawing showing a part of the frame structure of the vehicle body. In the figure, 1, 1 are side members with a hat-shaped cross section that are arranged in parallel along the longitudinal direction on both sides of the vehicle body, and 2 is a side member. A cross member with a gate-shaped cross section is constructed along the vehicle width direction at an appropriate location between 1 and 1, 3 is a side member 1, 1
The rocker inner members 4, 4 are suspension members with a hat-shaped cross section that are installed between the side members 1, 1 and the rocker inner member 3, facing the cross member 2. , 1 and the suspension member 4.4 are arranged with the opening side facing upward, and a floor panel 9 is laid on the upper surface and fixed by welding, so that a highly rigid box cross-sectional structure with a closed cross section is obtained. be.

5 is a trailing arm, 6 is a wheel portion attached to the tip of the trailing arm 5, and 7°8 is an inner member that connects the rear attachment portion 5as5b of the trailing arm 5 to the suspension member 4 side and supports it swingably. They are a bracket and an outer bracket.

The present invention utilizes the inner bracket 7 for mounting the trailing arm 5 to connect the connecting parts of the side member 1, cross member 2, and suspension member 4 together. As shown in Figure 3, cross member 2
The height of the side walls 11a, 11b is formed higher than the height of the side walls 10a, 10b of the side member 1, and a gate-shaped joining flange 12 is formed on the end face toward the outside.

The suspension member 4 has side walls 13a and 13b that are higher in height than the side walls 10a and 10b of the side member 1, and the upper part of the side walls 13a and 13b is the same width as the side member 1 from the inner end side. A notch outside the height dimension of the side wall 10a is formed, and a stepped portion 14 that abuts and supports the side member 1 is formed. It is brought into contact with the bottom wall 10c, the joining flange 14c at the tip is flush with the lower blade of the other side wall 10b of the side member 1, and the upper edge flanges 10a', 10b', 13a
', 13b' are made flush.

The inner bracket 7 has a side wall 15 as shown in FIG.
The heights of a and 15b are set to the side wall 1 of the suspension member 4.
3a, 13b, and side walls 15a, 15.
The dimension between the side walls 10a and 10b of the side member 1 is formed to be equal to the dimension between the side walls 10a and 10b of the side member 1, and the upper rear part of one of the side walls 15a is cut out to fit the shape of the suspension member 4 to form the support part 16, and the The upper part of the side surface 15b is made to follow the side surface 10b of the side member 1, and when coupled, the upper edge flange 16' of the support part 16 of one side wall 15a is brought into contact with the side wall 13a and the bottom wall 13c of the suspension member 4, The other side wall 15b is connected to the side wall 1 of the side member 1.
0b and the joining flange 14c at the inner end of the suspension member 4.

Further, an escape groove 17 is formed on the rear end side of the bottom wall 15c of the inner bracket 7 so as not to interfere with the swinging movement near the attachment portion of the trailing arm 5, and in correspondence with this escape groove 17, the side walls 15a, A through hole 18a is provided at the bottom of 15b.

This is an imitation of 18b.

To connect each member, the inner end of the suspension member 4 is attached to the lower surface of the side member 1, and the upper flange portions 14a and 14b of the stepped portion 14 are brought into contact with and overlapped with the side wall 10a and bottom wall 10c of the side member 1. Then, the inner bracket 7 is attached to the lower part of the side member 1 and the suspension member 4, and the inner bracket 7 is attached to the lower part of the side member 1 and the suspension member 4.
The upper edge flange 16' of the support part 16 of 5a is brought into contact with and overlapped with the side wall 13a and bottom wall 13c of the suspension member 4, and the other side wall 13b is joined to the side wall 10b of the side member 1 and the tip of the stepped part 14 of the suspension member 4. The flange 14c is brought into contact and superposed, and each overlapping portion is fixed by welding.

Next, the joining flange 12 on the end face of the cross member 2 is brought into contact with the outer surface of the side wall 15b of the inner bracket 7 and fixed by welding to complete the joining.

After this, as shown in FIG. 5, the trailing arm 5 is placed in the lower space between the side walls 15a and lsb of the inner bracket 7.
Insert the inner mounting part 5a of the
18b and into the mounting portion 5a via an elastic bushing 20, which is tightened with a nut 21 to swingably support the mounting portion 5a.

The external force attachment portion 5b may be swingably attached to the outer bracket 8 fixed to the suspension member 4 in the same manner as in the conventional case.

Although only one side of the trailing arm 5 is attached and the side members 1, cross members 2, and suspension members 4 are connected to each other, the opposite side is constructed in the same manner.

In the above-mentioned trailing arm mounting structure, the joining parts of the side member 1, cross member 2, and suspension member 4 are combined and joined together by the inner bracket 7 that supports the inner mounting part 5a of the trailing arm 5. Moreover, the side member 1 and the suspension member 4 are overlapped and fixed, and the inner bracket 7 fixed to the side member 1 and the suspension member 4 are overlapped and fixed, and each member is fixed to the inner bracket 7. , the joint rigidity is increased, and the joint strength of the inner bracket 7 is also increased.
On the other hand, the suspension member 4 has a box cross-sectional structure with a completely closed cross section, and the rigidity of the suspension member 4 itself is also improved, and the supporting rigidity of the trailing arm 5 supported by the inner bracket 7 and the outer bracket 8 is has been significantly improved, and even if a considerably large load is applied to the trailing arm 5, it can be sufficiently supported, and the load is transmitted and distributed to the suspension member 4, side member 1, and cross member 2 via the inner bracket 7. Therefore, the load is not concentrated on the suspension member 4, the inner bracket 7, and the outer bracket 8, and the trailing arm 5 can be supported reliably and safely.

Furthermore, since the load force is not concentrated on the suspension member 4, the member 4 can be made smaller and lighter in weight.

As explained above, this invention overlaps the upper surface of the inner end of the suspension member with the lower surface of the side member, supports the overlapping lower surface of the suspension member on one side of the inner bracket with a chevron-shaped cross section, and supports the other side of the inner bracket. The end opening of the suspension member is closed at the lower part of the inner side, and the upper part of the inner side is brought into contact with the side member, and the end face of the cross member is overlapped with the outer side of the inner bracket, and each overlapping part is joined. The inner attachment part of the trailing arm is pivotably pivoted between the rear sides of the suspension member, an outer bracket is attached to the outer side of the suspension member, and the outer attachment part of the trailing arm is pivotably pivoted to the outer bracket. From this, the side members, cross members, and suspension members are combined and connected using the inner bracket for attaching the trailing arm, which improves the joint rigidity of each member and also improves the rigidity of the suspension member, increasing the supporting rigidity of the trailing arm. Furthermore, the load from the trailing arm can be distributed to each part of the suspension member, side member, and cross member9, and even if a considerably large load is applied to the trailing arm, it can be sufficiently supported.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view showing the mounting structure of the trailing arm according to the present invention, Fig. 2 is a perspective view of main parts showing the connection structure of each part by an inner bracket, Fig. 3 is a sectional view showing the connected state, FIG. 4 is a perspective view showing the shape of the inner bracket, and FIG. 5 is a sectional view showing the state in which the trailing arm is attached. 1...Side member, 2...Cross member 4...Suspension member, 5.
... Trailing arm, 7 ... Inner bracket.

Claims (1)

[Scope of utility model registration request] The upper surface of the inner end of the suspension member overlaps the lower surface of the side member, the overlapping lower surface of the suspension member is supported by one side of the inner bracket having a chevron-shaped cross section, and the end of the suspension member is supported by the lower surface of the other inner surface of the inner bracket. At the same time as closing the opening, the upper part of the inner surface is brought into contact with the side member, and the end surface of the cross member is overlapped with the outer surface of the inner bracket, each overlapping part is joined, and the inner side of the trailing arm is connected between the rear side of the inner bracket. Mounting of a trailing arm characterized in that a mounting portion is pivotally mounted to be freely swingable, an outer bracket is attached to the outside of the suspension member, and an outer mounting portion of the trailing arm is pivotally mounted to the outer bracket so as to be freely swingable. structure.