JPH04212674A - Body mounting device for suspension member - Google Patents

Abstract

PURPOSE:To secure such a mounting device that is high in the supporting rigidity of a suspension member and able to reduce the cost of production. CONSTITUTION:One end of a serration bolt 25 supporting a suspension member 11 via an insulator 27 is clamped and supported by a body floor 21 long in a distance between two points, a bottom surface of a U-shaped sectional cross- member 22 forming a closed sectional structure in this floor 21 and a plate member 24.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for attaching a suspension member to a vehicle body in an automobile.

0002

2. Description of the Related Art Conventionally, as a vehicle body mounting device for a suspension member, the one shown in FIG. 4 is known.

To briefly explain this, 1 is a vehicle floor, 2 is a cross member fixed to the lower surface of the vehicle body floor 1 by welding, and within this cross member 2 are an upper reinforcing plate 3, a lower reinforcing plate 4, and a lower reinforcing plate 4. A collar 5 is fixed by welding. Further, a plate member 7 into which the serrations of bolts 6 are inserted and fixed is fixed to the upper reinforcing plate 3 by welding, and the bolts 6 pass through the inside of the collar 5 and protrude outward from the cross member 2. Then, the suspension member 9 is attached to the protrusion of the bolt 6 via the insulator 8 in which the elastic body 8C is arranged between the inner cylinder 8A and the outer cylinder 8B.
is supported. 10 is a fixing nut.

0004

However, in such a conventional structure, an upper reinforcing plate 3 is attached to an intermediate portion of the closed cross section of the cross member 2, which forms a closed cross section together with the vehicle body floor 1.
The upper reinforcing plate 3, the lower reinforcing plate 4, and the bottom surface of the cross member 2 provide rigidity and are configured to receive the load input to the bolt 6, with a sufficient distance between both load supporting points. There was a problem that the sound and vibration performance deteriorated due to the lack of rigidity.

[0005] Furthermore, in order to constitute the upper load support point of the bolt 6, the upper reinforcing plate 3 is specially required, which increases the number of parts and the number of assembly steps, which causes an increase in cost. There was also.

SUMMARY OF THE INVENTION An object of the present invention is to provide a suspension member mounting device for a vehicle body that can solve the conventional problems, increase rigidity, improve sound and vibration performance, and reduce cost. It is in.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a member having a substantially U-shaped cross section that is fixed to the lower surface of a vehicle body floor while forming a closed cross section structure, and a member that is fixed to the bottom surface of the member. A plate member that is fixedly fixed and has a fitting hole formed therein; a bolt member that is inserted and fixed into the fitting hole of the plate member and has one end fixed to the vehicle body floor; and a bolt member that is supported by the bolt member via an insulator. It is characterized by comprising a suspension member.

[0008]

[Operation] According to the present invention, the bolt member supporting the suspension member via the insulator is fixed to the bottom surface of the member having a substantially U-shaped cross section, which is fixed to the lower surface of the vehicle floor while forming a closed cross section structure. It is inserted and fixed into the fitting hole of the plate member, and one end is fixed to the vehicle body floor.

[0009] Therefore, the input load to the bolt member is supported by the vehicle body floor and the bottom surface of the member, and since a sufficient distance can be provided between the load supporting points, the rigidity is increased.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, FIG. 2 shows an example of an automobile suspension to which the present invention is applied.

In the figure, reference numeral 11 is a suspension member, which is connected via mounting portions 11A and 11B as described later.
It is attached to a member on the lower surface of the vehicle body floor, which is not shown in this figure for ease of understanding.

As is well known, the suspension member 11 includes various suspension arms 12 (lower arm 12A).
, a front upper arm 12B, a rear upper arm 12C, and a lateral link 12D are rotatably supported under a predetermined geometric relationship, and impart a predetermined constraint motion to the illustrated road wheel 13. In addition, 1
4 is a shock absorber, and 15 is a coil spring.

Next, FIG. 1 shows an embodiment of the present invention.

In the figure, reference numeral 21 denotes a vehicle body floor, on which an embossment 21A protruding downward is formed. 22 is a cross member with a substantially U-shaped cross section whose flange portion is fixed to the lower surface of the vehicle floor 21 by welding;
A reinforcing plate 23 is fixed to the bottom surface of this cross member 22 along the shape of the bottom surface. A plate member 24 made of a thick plate is fixed to the reinforcing plate 23 by welding at its peripheral edge. The plate member 24 is provided with a fitting hole 24A at its center.

25 has a serration portion 25A fitted and fixed into the fitting hole 24A of the plate member 24 on the mid-abdomen, a flange portion 25B adjacent thereto, and threaded portions 25C and 2 at both ends.
This is a serration bolt with 5D. However,
The threaded portion 25C protrudes from a through hole formed in the embossed portion 21A of the vehicle floor 21 to the upper surface of the vehicle floor 21, and is fixed to the vehicle floor 21 with a nut 26 screwed thereon.

Cross member 2 of serration bolt 25
The above-mentioned suspension member 11 is supported on the protruding portion from 2 via an insulator 27 in which an elastic body 27C, such as rubber, is disposed between an inner cylinder 27A and an outer cylinder 27B, as in the conventional case. A nut 28 is screwed onto the threaded portion 25D of the serration bolt 25 to fasten and hold the inner cylinder 27A of the insulator 27 via a cover member 29.

In this embodiment having the above structure, first, the reinforcing plate 23 and then the plate member 24 are fixed to the bottom surface of the cross member 22 by welding. Then, the serration bolt 25 is inserted into the fitting hole 24A of the plate member 24.
The serration portion 25A of the plate member 2 is connected to the collar portion 25B.
Press-fit and fix until it contacts 4. After that, attach the upper threaded portion 25C of the serration bolt 25 to the vehicle body floor 2.
1, the flange portion of the cross member 22 is fixed to the lower surface of the vehicle body floor 21 by welding. Then, a nut 26 is screwed onto the threaded portion 25C via a washer, and the vehicle body floor 21 and the serration bolt 25 are firmly fastened and fixed.

Thereafter, the suspension member 11 is attached to the protruding portion of the serration bolt 25 from the cross member 22 via the insulator 27 as described above.

In this state, even if a force is applied from the suspension member 11 in a direction perpendicular to the axis of the serration bolt 25, for example, the load will be applied to the vehicle body floor 21, the bottom surface of the cross member 22, and the plate, which can take a relatively long distance. It is received by the member 24 and supported with high rigidity.

In another embodiment of the present invention shown in FIG. 3, a reinforcing plate 30 is provided on the upper surface of the vehicle floor 21 in order to further increase the rigidity, and the threaded portion 25C of the serration bolt 25 and the nut 26 are used to tighten the vehicle body. The floor 21 and reinforcing plate 30 are fastened together.

When assembling this reinforcing plate 30, spot welding is performed with three plates stacked on top of each other when welding the flange of the cross member 22 to the vehicle body floor 21 as described in the previous embodiment. In this way, although the effect of reducing the number of parts related to the upper reinforcing member compared to the conventional case cannot be obtained, simultaneous welding with the cross member 22 is possible during assembly, and the number of man-hours can be reduced.

Further, in the above-described embodiment, the suspension member is attached to the cross member, but it goes without saying that the suspension member may be attached to the side member.

Further, although the serration bolt 25 is of the type having a threaded portion 25C on the head, it is instead of a recessed screw type, and by screwing the bolt into this recessed screw, the car body floor 21 and the serration bolt 25 are connected. One end may be fixed.

[0025]

As is clear from the above description, according to the present invention, the bolt member supporting the suspension member is fixed to the vehicle body floor and has a substantially U-shaped cross section that forms a closed cross-sectional structure. It is fixed between the bottom surface and the plate member, and the distance between the fixed points can be increased, increasing the rigidity and improving the sound and vibration performance. Further, since no reinforcing plate is provided within the closed cross-section structure, cost reduction can be achieved. Furthermore, since it is possible to simultaneously tighten other components on the upper surface of the floor when fixing the bolt member to the vehicle floor side, the number of parts and the number of assembly steps can be reduced compared to the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of an automobile suspension to which the present invention is applied.

FIG. 3 is a sectional view showing another embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

11 Suspension member 21　Vehicle floor 22 Cross member 23 Reinforcement plate 24 Plate member 25 Serration bolt 27 Insulator

Claims (1)

[Claims] 1. A member having a substantially U-shaped cross section fixed to the lower surface of a vehicle body floor while forming a closed cross-sectional structure; a plate member fixed to the bottom surface of the member and having a fitting hole formed therein;
A suspension member comprising: a bolt member inserted and fixed into a fitting hole of the plate member and having one end fixed to the vehicle body floor; and a suspension member supported by the bolt member via an insulator. car body mounting device.