JPH06144284A - Suspension sub-frame fitting structure - Google Patents

Abstract

PURPOSE:To provide suspension sub-frame fitting structure improving strength especially, between an upper member and a lower arm bracket, reducing both material cost and manufacturing cost and facilitating the positioning of the lower arm bracket to the upper member and lower member. CONSTITUTION:The side end part 10a of an upper member 10 is bent downward, and a cutout part is provided on the outer side of the front end part 11a of a lower member 11. The side end part 10a of the upper member 10 is welded to the side end of the upper face part 13a of a lower arm bracket 13 so as to provide a space of closed cross section between the lower arm bracket 13 and the upper member 10, and the cutout part of the lower member 11 is welded to the lower end of the side face part 13b of the lower arm bracket 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension sub-frame mounting structure, and more particularly, to a sub-frame formed by joining an upper member and a lower member to each other to form a sub-frame. The present invention relates to a suspension subframe mounting structure with a lower arm bracket attached.

[0002]

2. Description of the Related Art Conventionally, a suspension subframe is attached in which an upper member 1 and a lower member 2 are joined to each other to form a subframe 3, and a lower member 1 is provided with a box-shaped lower arm bracket 4 opened downward and laterally. There is a structure (Fig. 6-8 and actual fair 2-3
74 publication).

The suspension sub-frame 3 supports the rear end of the engine mount member 5 at its central portion, and the suspension lower arms 6 at its left and right ends.
6 is supported.

In FIG. 6, 7 and 7 are a pair of side members, and 8 is a first cross member arranged between the front end portions of the pair of side members 7 and 7.

In the conventional suspension subframe mounting structure described above, the lower arm bracket 4 has an extending portion 4a extending from the lower end thereof, as shown in FIG.

An upper surface of the lower arm bracket 4 is superposed and fixed to the upper member 1, and an extending portion 4a thereof is superposed and fixed to the lower member 2.

[0007]

In the conventional suspension subframe mounting structure, the upper member 1 is used.
It was necessary to improve the strength between the lower arm bracket 4 and the lower arm bracket 4.

Further, in the conventional suspension sub-frame mounting structure, since the lower arm bracket 4 is provided with a large extending portion 4a, there is a problem that the material cost and the manufacturing cost are high.

Further, in the conventional suspension subframe mounting structure, positioning of the lower arm bracket 4 with respect to the upper member 1 and the lower member 2 is not easy, so that the fixing work of the lower member is troublesome.

The present invention has been made in view of the above circumstances, and in particular, the strength between the upper member and the lower arm bracket can be improved, and further, the material cost and the manufacturing cost can be reduced. Another object of the present invention is to provide a suspension sub-frame mounting structure that enables easy positioning of the lower arm bracket with respect to the upper member and the lower member.

In the present invention, in order to achieve the above object,
In a suspension subframe mounting structure in which an upper member and a lower member are joined to each other to form a subframe, and a box-shaped lower arm bracket that opens downward and laterally is attached to the lower member, a side end portion of the upper member is moved downward. Along with bending, a notch is provided outside the front end of the lower member, and the side end of the upper member is welded to the side end of the upper surface of the lower arm bracket to form a closed cross section between the lower arm bracket and the upper member. A space is provided and the notch of the lower member is welded to the lower end of the side surface of the lower arm bracket.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a suspension subframe mounting structure according to the present invention will be described in detail below with reference to the accompanying drawings.

1 to 5 show an embodiment of the present invention. In the suspension subframe mounting structure of this embodiment, the upper member 10 and the lower member 11 are joined to each other to form the subframe 12, and the lower member 11 is formed.
In addition, a box-shaped lower arm bracket 13 having lower and side openings is attached.

Further, a side end portion 10a of the upper member 10
Is bent downward in a substantially crank shape to form a flange shape, and the front end portion 1 of the lower member 11 is formed.
A cutout portion 14 is provided on the outer side of 1a.

The side end portion 10a of the upper member 10
Is welded to the side end of the upper surface portion 13a of the lower arm bracket 13 and also to the upper end side portion 11b of the lower member 11 formed in a substantially flange shape, whereby the sub-frame 12 is formed.

In the sub-frame 12, the upper member 1
0, the lower arm bracket 13, and the lower member 11 form a closed cross-section space 15. Closed cross section space 1
5 is formed to extend from the side surface portion 13b of the lower arm bracket 13 to the upper surface portion 13a.

Further, in this embodiment, the peripheral edge portion 11a of the cutout portion 14 of the lower member 11 is directly welded to the lower end of the side surface portion 13b of the lower arm bracket 13 by fillet welding.

FIG. 3 shows an example in which the peripheral edge portion 11a of the notch portion 14 of the lower member 11 is bent into a substantially crank shape and welded to the lower end of the side surface portion 13b of the lower arm bracket 13, and FIG. An example is shown in which the peripheral edge portion 11a of the cutout portion 14 of the lower member 11 is bent into a substantially L shape and is erected, and the peripheral edge portion is brought into contact with the lower end of the side surface portion 13b of the lower arm bracket 13 and welded. Therefore, either one may be adopted in the present invention.

Side portion 13b of the lower arm bracket 13
A flange portion 13c is provided at the lower end of the lower arm bracket in a substantially horizontal direction to ensure rigidity on the opening side of the lower arm bracket.

In this embodiment, the lower arm bracket 13
Since the closed cross-section space 15 is provided between the upper member 10 and the upper member 10, the rigidity of the sub-frame, particularly the strength between the upper member 10 and the lower arm bracket 13 can be improved.

Further, in this embodiment, since the lower arm bracket 13 does not have the extending portion as in the conventional case,
The structure of the lower arm bracket is simplified, the material cost and manufacturing cost of the subframe 12 can be reduced, and the weight thereof can be reduced.

Further, in this embodiment, since the lower member 11 is joined to the lower arm bracket 13 by fillet welding, the joining rigidity can be improved.

Furthermore, since the lower member 11 is joined to the lower arm bracket 13 by fillet welding, it is possible to increase the rigidity with respect to a lateral load in the vicinity of the lower arm bracket 13.

The rigidity against the load in the lateral direction is particularly obtained by bending the peripheral edge end 11a of the cutout portion 14 of the lower member 11 into a substantially L-shape and standing it up, and the peripheral edge end of the side surface portion 13b of the lower arm bracket 13. It is remarkable when it is welded to the lower end.

Moreover, in this embodiment, the upper member 10
The side end 10a of the lower arm bracket 13 to the upper surface 1
3a is welded to the side end of the lower member 11, and the notch 14 of the lower member 11 is brought into contact with and welded to the lower end of the side surface portion 13b of the lower arm bracket 13. Therefore, the lower arm bracket 13 is positioned with respect to the upper member 10 and the lower member 11. It can be done easily.

[0026]

According to the suspension sub-frame mounting structure of the present invention, since the closed cross-section space is provided between the lower arm bracket and the upper member,
It is possible to improve the rigidity of the subframe, particularly the strength between the upper member and the lower arm bracket.

Further, in the present invention, since the lower arm bracket does not have the extending portion as in the conventional case, the structure of the lower arm bracket is simplified, and the material cost and the manufacturing cost of the subframe can be reduced. In addition to being able to do so, it is possible to reduce the weight.

Further, in the present invention, since the lower member is joined to the lower arm bracket by fillet welding,
The joint rigidity can be improved.

Furthermore, in the present invention, since the lower member is joined to the lower arm bracket by fillet welding, it is possible to increase the rigidity against a lateral load in the vicinity of the lower arm bracket.

Further, in the present invention, the side end portion of the upper member is welded to the side end portion of the lower arm bracket upper surface portion, and the notch portion of the lower member is brought into contact with the lower end of the side surface portion of the lower arm bracket to be welded. Therefore, the lower arm bracket can be easily positioned with respect to the upper member and the lower member.

In the present invention, it is also possible to improve the rigidity of the opening side of the lower arm bracket by providing a flange portion in the lower end of the side surface of the lower arm bracket in a substantially horizontal direction.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a suspension subframe mounting structure according to the present invention.

FIG. 2 is a perspective view showing a lower member of an embodiment of a suspension subframe mounting structure according to the present invention.

3 is a cross-sectional view taken along the line AA in FIG.

4 is a cross-sectional view taken along the line AA in FIG.

FIG. 5 is a perspective view showing a lower arm bracket of an embodiment of a suspension subframe mounting structure according to the present invention.

FIG. 6 is a plan view conceptually showing the arrangement position of subframes.

FIG. 7 is a perspective view showing a lower arm bracket of a conventional suspension subframe mounting structure.

FIG. 8 is a cross-sectional view corresponding to FIG. 3 or 4 showing an example of a conventional suspension subframe mounting structure.

[Explanation of symbols]

 10 Upper Member 10a Side End 11 Lower Member 11a Front End 12 Subframe 13 Lower Arm Bracket 13a Upper Surface 13b Side Surface 13c Flange 14 Notch 15 Closed Section Space

Claims (1)

[Claims] 1. A suspension subframe mounting structure in which an upper member and a lower member are joined to each other to form a subframe, and a box-shaped lower arm bracket that opens downward and laterally is attached to the lower member. The end portion is bent downward, and a cutout portion is provided on the outside of the front end portion of the lower member, and the side end portion of the upper member is welded to the side end portion of the upper surface portion of the lower arm bracket so that the lower arm bracket and the upper member are connected to each other. A suspension subframe mounting structure, characterized in that a closed cross-section space is provided between the lower member and the cutout portion of the lower member, and the lower end portion of the side surface of the lower arm bracket is welded.