JPH0328009A - Suspension mounting part structure of automobile - Google Patents

Abstract

PURPOSE:To prevent deflection of the tip of a suspension bolt to facilitate centering by providing an upper part reinforcing member and a lower part reinforcing member inside a crossmember, making the suspension bolt penetrate through the reinforcing members, and connecting the bolt through bolt plates by serrations to the reinforcing members. CONSTITUTION:A lower side reinforcing member 4 of U-shaped cross section is spot-welded and arranged inside a crossmember 3 made of steel plates. Between the upper edge parts of the crossmember, an upper side reinforcing member 5 is arranged so as to connect the side face of a side member 2 to the lower side reinforcing member 4. Further, through holes 8, 7 are formed respectively in the upper and lower side reinforcing members 5, 4. A suspension bolt 9 is inserted through penetration bores 7, 8 and a penetration bore 10 of the crossmember 3, and fixed through bolt plates 11, 13 by serrations 12, 14 to the respective upper and lower reinforcing members 4, 5. By this constitution, deflection of the tip of the suspension bolt can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a suspension mounting structure for an automobile.

[Prior art]

The present applicant previously proposed a suspension mounting structure for an automobile in Utility Application No. 125560/1983.

The outline of this suspension mounting structure is shown in Figure 9. That is, in this figure, 1 is a rear floor, 2 is a side member fixed to the lower surface of the rear floor 1 and extends in the longitudinal direction of the vehicle body, and 3 is a rear suspension bracket, which is also fixed to the lower surface of the rear floor 1 and extends in the left-right direction of the vehicle body. 4 is a lower reinforcing member fixed along the inside of this cross member 3; 5 is an upper reinforcing member connected to the upper part of this lower reinforcing member 4 and the side surface of the side member 2; 6; 9 is a cylindrical body fixed between the through hole 7 of the lower reinforcing member 4 and the through hole 8 of the upper reinforcing member 5 by welding W, W, and 9 is the cylindrical body 6 and the cross member 3 a suspension bolt for supporting suspension structural components installed through a through hole 10 drilled in the bottom;
11 is a rigid donut-shaped bolt plate which is fixed to the upper reinforcing member 5 by gas welding W3 and whose inner periphery is connected to the suspension bolt 9 through serrations 12.

According to such a structure, the suspension bolt 9 is supported in two stages, upper and lower, so that its support rigidity is increased, and therefore, the thickness of the cross member 3, which is a suspension bracket, can be reduced.

[Problem to be solved by the invention]

However, in such prior art, among the upper and lower support parts of the suspension bolt 9, the upper support part is connected by the serrations 12 via the bolt plate l1, but the lower support part simply connects the cylindrical body 6. Since the suspension bolt 9 is only penetrated, there is a gap between the suspension bolt 9 and the cylindrical body 6. Therefore, when the suspension bolt 9 is manually operated, the tip of the suspension bolt 9 swings a lot, and the swing only generates abnormal noise. However, there was a problem in that it was difficult to center the suspension bolt 9 during assembly. The present invention has been made in view of the problems of the prior art, and aims to reduce the amount of deflection at the tip of a suspension bolt, prevent the generation of abnormal noise, and facilitate centering during assembly of the suspension bolt. The purpose of the present invention is to provide an automobile suspension mounting structure that allows for the following.

[Means to solve the problem]

In order to achieve this object, the present invention provides U-shaped lower reinforcement that is fixed to the inside of a cross member, which is a suspension bracket that supports suspension components, along the bottom and front and rear side walls of the cross member. and an upper reinforcing member connected to the upper part of the lower reinforcing member and the side surface of the side member, and a suspension bolt is passed through each through hole of each of the upper reinforcing member, the lower reinforcing member, and the cross member. The suspension mounting structure for an automobile is characterized in that the upper and lower parts of the suspension bolt are connected and attached to the upper reinforcing member and the lower reinforcing member, respectively, through bolt plates by serrations. be.

[For production]

The suspension bolt is rigidly supported by being connected to the upper reinforcing member and the lower reinforcing member by serrations via the bolt plate, which reduces the amount of deflection at the tip. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

Note that parts that are the same as the conventional example are given the same symbols. In FIG. 1, 1 is a rear floor, 2 is a side member fixed to the lower surface of the rear floor 1 and extends in the longitudinal direction of the vehicle body, 3
1 is a cross member which is a rear suspension bracket extending in the left-right direction of the vehicle body, which is also fixedly fixed to the lower surface of the rear floor 1. The cross member 3 is a frame member formed by bending a steel plate into an upwardly opening shape. A lower reinforcing member 4 bent in a U-shape is disposed along the inner side thereof, and is fixed to the cross member 3 by spot welding.

A through hole 10 is formed in the lower surface of the cross member 3, and a through hole 7 is also formed in the center of the bottom surface of the lower reinforcing member 4, coinciding with the through hole 10.

An upper reinforcing member 5 is provided between the upper edges of the lower reinforcing member 4.
is located.

This upper reinforcing member 5 is a steel plate component that is approximately rectangular in plan view, and has a through hole 8 bored in the center like the lower reinforcing member 4.
The side along the front and rear side walls of the cross member 3 and the side along the side member 2 are formed with upwardly bent edges. These edges are fixed to the cross member 3 or directly to the side wall of the side member 2 by spot welding with the upper part of the lower reinforcing member 4 sandwiched therebetween.

Suspension bolts 9 for supporting suspension components (not shown) having threaded portions 9a at their lower ends are inserted through each of the through holes 8, 7, 10.

Rigid donut-shaped bolt plates 11 are provided at the upper and lower parts of the suspension bolt 9, respectively. The inner circumference of 13 is serration 12. 14, and the peripheral edges of these bolt plates 11.13 are gas welded to the upper reinforcing member 5 and the lower reinforcing member 4.
It is fixed by

The suspension bolt 9 side of the serration 14 has a tapered portion 9b that becomes thinner toward the bottom.

Next, the assembly process of the rear suspension mounting portion configured as described above will be explained.

First, as shown in FIG. 2, the suspension bolt 9 is press-fitted into the bolt play eye 1 and connected with the serration seam 12, and then, as shown in FIG.
1 is fixed to the upper reinforcing member 5 by gas welding W. On the other hand, as shown in FIG. 4, the bolt plate 13 is fixed to the lower reinforcing member 4 by gas welding W4, and as shown in FIG. 5, the bolt plate 13 in this assembly is attached to the assembly shown in FIG. The suspension bolts 9 are press-fitted and connected by the serrations 14, and then the upper reinforcing member 5 is attached.
and the lower reinforcing member 4 are spot welded. 6th after Il
As shown, the assembly and cross member 3 shown in FIG.
The assembly is completed by spot welding. With this structure, the suspension bolt 9 is connected to the upper reinforcing member 5 and the lower reinforcing member 4 through bolt braces 11, 13, and serrations 12. 14, and are rigidly supported in what is called a two-stage serration connection, so the amount of deflection at the lower end is extremely reduced and no abnormal noise is generated.

Furthermore, since the serrations 14 of the suspension bolt 9 are tapered portions 9b, centering can be performed smoothly, easily, and with high accuracy when assembled into the bolt plate l3. Furthermore, since the vertical input of the suspension can be received by the buckling strength of the suspension bolt 9 itself, the cylindrical body 6 as in the prior art can be eliminated, leading to a reduction in weight and cost. In addition, if the mounting part of the above structure lacks rigidity against vertical input, a collar 15 and a place 16 may be installed between the upper reinforcing member 5 and the bolt plate 13, as shown in FIGS. 7 and 8. All you have to do is intervene.

〔effect〕

As described above, according to the present invention, a U-shaped lower part is fixed to the inside of a cross member, which is a suspension bracket that supports suspension components, along the bottom and front and rear side walls of the cross member. A side reinforcing member and an upper reinforcing member connected to the upper part of the lower reinforcing member and the side surface of the side member are provided, and suspension bolts are inserted into the through holes of the upper reinforcing member, the lower reinforcing member, and the cross member. Since the upper and lower parts of the suspension bolt are connected to the upper reinforcing member and the lower reinforcing member through the bolt plate by serrations, the amount of deflection of the lower end of the suspension bolt is reduced, and the The effect is that no sound is generated.

[Brief explanation of drawings]

Fig. 1 is an explanatory longitudinal cross-sectional view showing one embodiment of the present invention;
Figure, Figure 3. FIGS. 4, 5, and 6 are explanatory diagrams showing the &l process of the suspension mounting part according to the present invention, and FIG.
8 and 8 are explanatory views showing other different embodiments of the present invention, respectively, and FIG. 9 is an explanatory longitudinal sectional view showing the prior art. 2... Side member, 3... Cross member, 4... Lower reinforcing member, 5... Upper reinforcing member, 7, 8, 10... ...Through hole, 9...
...Suspense bolt, 11, l3...
Bolt plate, 12. 14... Serration. Hide 2 Hakusen 3 Dan

Claims (1)

[Claims] A U-shaped lower reinforcing member is fixed to the inside of the cross member, which is a suspension bracket that supports suspension components, along the bottom and front and rear side walls of the cross member, and the upper part of this lower reinforcing member is fixed to the inside of the cross member, which is a suspension bracket that supports suspension components. an upper reinforcing member connected to the side surface of the side member; a suspension bolt is provided to pass through each through hole of each of the upper reinforcing member, lower reinforcing member, and cross member; the upper and lower parts of the suspension bolt are provided; A suspension mounting structure for an automobile, characterized in that the upper reinforcing member and the lower reinforcing member are connected and attached to the upper reinforcing member and the lower reinforcing member by serrations via bolt plates.