JPH02374Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the field of structural technology for front subframes of automobiles, which support the engine, suspension, steering, etc. at the front lower part of the vehicle.

Therefore, in this invention, a top member and a lower member made of plate materials are joined through a hollow part to form a front subframe body attached to the front underbody, and furthermore, a lower arm is attached to both ends of the front subframe body. This invention relates to a front subframe structure of an automobile that is equipped with a lower arm bracket that locks the front subframe.In particular, this invention relates to a front subframe structure of an automobile in which the lower arm bracket is bonded and fixed to both the upper member and the lower member of the front subframe body. This is the idea.

<Prior art> In general, the components that make up the front body of an automobile are determined by the engine mounting position, drive system,
Various types are used depending on the suspension, steering system, engine support method, etc.

Among these, in the front underbody, a front subframe is installed on the front side members on both sides of the vehicle, and the front subframe supports the engine, suspension, steering, etc. Front drive vehicle (hereinafter referred to as FF vehicle)
It has been adopted by many others.

Generally, large loads are applied to the front subframe from multiple directions due to the engine, suspension, steering, etc., so the front subframe must be able to sufficiently support such loads. High rigidity is required.

Therefore, conventionally, in consideration of reducing the weight of the members, the front subframe has a closed cross-section structure by joining the upper and lower members, which are made of rigid plates and have a substantially U-shaped cross section, at the peripheral edges of their openings. It was designed for rigidity.

In addition, when the lower arm is supported at both ends of the front subframe, a lower arm bracket is attached to the lower surface of both ends of the lower member, and the lower arm is locked through the lower arm bracket. Ta.

<Problem to be solved by the invention> However, in the conventional front subframe described above, the connection between the front subframe body consisting of the upper member and the lower member and the lower arm bracket relies only on the joint surface between the lower surface of the lower member and the upper surface of the lower arm bracket. Therefore, there was a problem in that the joint rigidity was insufficient for the joint portion of the lower arm bracket to which a large load is applied by the lower arm while the vehicle was running.

Furthermore, in the conventional front subframe described above, the joint of the lower arm bracket to the front subframe body is only on the lower member side.
The load transmitted and applied from the lower arm via the lower arm bracket generates various stresses such as partially uneven bending, compression, and tension on the front subframe body, which is extremely disadvantageous in terms of rigidity.

The purpose of this invention was to solve the problems of the front subframe structure of automobiles based on the above-mentioned conventional technology, and to improve the joint rigidity of the component parts, increase the rigidity of the entire product, and improve the durability of the vehicle. It is an object of the present invention to provide an excellent automobile front subframe structure that improves the application of reinforcing member technology in the automobile industry.

<Means for solving the problem> In accordance with the above-mentioned purpose, the structure of this invention, which is summarized in the scope of the above-mentioned utility model registration claim, is that in order to solve the above-mentioned problem, the upper member and the lower member formed of plate materials are formed into hollow parts. In an automobile front subframe structure in which lower arm brackets are attached to both ends of the front subframe body, the lower arm brackets are connected to the front subframe body. This is a front subframe structure for an automobile, characterized in that an upper member and a lower member are joined and fixed at both sides of the upper member and lower member to form a closed cross section.

<Function> A front sub-frame body with a closed cross-section structure is formed by joining an atsupa member and a lower member made of plate materials through a hollow part, and a lower arm bracket supporting the lower arm is connected to the atsupa member and lower member at both ends of the front subframe body. The front subframe body and the lower arm bracket are joined together to form a closed cross section to increase the overall product rigidity, and the front subframe body and lower arm bracket are joined together to increase the joint rigidity.

<Example> Next, an example of this invention will be described below based on the drawings.

Reference numeral 1 denotes a front subframe, which forms the center of the gist of this invention.As shown in Fig. 2, the main body of the front subframe is located between front side members 2, which run on both sides of the vehicle. Cross members 3 are interposed approximately in parallel, and a center member 4 is attached to the upper center of the cross member 3, and lower arms 5, 5 supporting the suspension at both ends thereof are arranged so that their pivots are not offset above and below the subframe. is maintained.

Further, as shown in FIG. 3, the front subframe 1 has an upper member 6 and a lower member 7 made of rigid plates, whose outer flange portions are joined to each other to form a so-called hollow-shaped closed cross-sectional structure. As shown in FIG. 2, the shape is approximately H-shaped in plan view, and a notch is formed in the upper member 6 and the lower member 7 at the front end of the widened portion at both ends formed in the H-shape. A lower arm bracket 8 is attached to the lower arm bracket 8.

Thus, the lower arm bracket 8 has a fourth
As shown in FIG. 5, a box portion 9 with an open lower surface and one side is formed, and an overlapping surface 10 of a predetermined shape extending outward is formed on the lower side of the box portion 9.
Furthermore, insertion holes 12, 12 for inserting locking rods (not shown) are formed in the two opposing side walls 11, 11' of the box part 9, and the end of one side wall 11 is provided with a box. A vertical flange 13 is formed extending toward the outside of the opening of the portion 9 .

The upper part of the vertical flange 13 is bent into an L-shape to form a joining flange 14 extending in the horizontal direction, as shown in FIG.

When the lower arm bracket 8 is joined to the upper member 6 and the lower member 7, the lower arm bracket 8 is fitted into the notches of the upper member 6 and the lower member 7, as shown in FIGS. As shown in FIG.
The upper surface of the lower member 7 is superposed and fixed to the lower surface of the lower member 7.

Furthermore, the vertical flange 13 and the joining flange 14 of the lower arm bracket 8 are connected to the lower member 7.
An end vertical surface 15 extending vertically from the lower surface of
and a flange (not shown) extending horizontally from the upper end of the vertical surface.

Further, bolt insertion holes 16 are formed in the upper surface of both ends of the upper member 6, so that the front subframe 1 is fixed to the body main body via bolts (not shown).

In addition, the bolt insertion hole 16 of the Atsupa member 6...
All the body fastening surfaces on which these are formed are set at approximately the same height.

In the above configuration, various loads applied to the front suspension when the vehicle is running are transferred to the lower arm 5.
The outer periphery of the box portion 9 of the lower arm bracket 8 is superposed and fixed to the lower surface of the upper member 8, and the overlapping surface 10 of the lower arm bracket 8, the vertical flange 13, and the joint Since the flange 14 is superposed and fixed to the inner surface of the lower member 7, the lower arm bracket 8 is three-dimensionally joined to the upper member 6 and the lower member 7, and each member is reliably joined and fixed to each other.

Furthermore, the lower arm bracket 8 is fitted into and joined to the notches at both ends of the upper member 6 and lower member 7, which are joined to each other, with the box portion 9 closing the notch. Both end portions of the lower member 7 also form a closed cross-sectional structure together with the lower arm bracket 8, and as a result, the entire area has a closed cross-section and its rigidity is maintained.

Further, since the lower arm bracket 8 is interposed and fixed between the upper member 6 and the lower member 7, the suspension load applied from the lower arm 5 can be smoothly distributed and transmitted to the upper member 6 and the lower member 7. .

Furthermore, since the body tightening surfaces on the upper surface of the atsupa member 6 are set at almost the same height, stress such as torsion and bending in the front subframe 1 is reduced when attaching the front subframe 1 to the body main body. This is advantageous in maintaining the rigidity of the front subframe 1.

Incidentally, it goes without saying that the embodiments of this invention are not limited to the above-mentioned embodiments, and other embodiments can be adopted.

<Effects of the invention> As described above, this invention has the excellent effect of basically increasing the joint rigidity between the component parts, increasing the overall rigidity of the product, and improving the durability of the vehicle. .

That is, a front subframe body having a closed cross-section structure is formed by joining an upper member and a lower member made of plate materials through a hollow part, and a lower arm bracket is joined to the upper member and lower member at both ends of the front subframe body. ,
This provides an excellent effect of reliably increasing the joint rigidity between the front subframe body and the lower arm bracket.

In addition, by joining the lower arm bracket to both sides of the upper member and the lower member, the suspension load applied from the lower arm can be smoothly transmitted to both the upper member and the lower member, so that the suspension load is not biased toward the upper member or the lower member. It also has the excellent effect of suppressing the generation of stress.

In this invention, since the lower arm brackets provided on both sides of the subframe body are joined to form a closed cross section, the rigidity at both sides is significantly increased as in the general part of the subframe. This has the effect of providing sufficient rigidity to provide sufficient support even when large loads from the suspension, steering, etc. are repeatedly applied.

In addition, in this invention, since the support part of the lower arm relative to the subframe body is not offset vertically, biased stress does not occur even when various loads are applied, and bending stress, compressive stress, tensile stress, etc. This has the effect that there is no disadvantage in terms of rigidity.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of one embodiment of this invention,
Figures 1, 4, and 5 are perspective views of the main parts, Figure 2 is a plan view, Figure 3 is a rear view, Figure 6 is a cross-sectional view of Figure 1, and Figure 7 is a cross-section of Figure 1. It is a diagram. 1...Front subframe, 6...Top member, 7...Lower member, 8...Lower arm bracket.

Claims (1)

[Scope of utility model registration request] A front subframe structure for an automobile in which a top member and a lower member formed of plate materials are joined through a hollow part to form a front subframe body with a closed cross section, and lower arm brackets are attached to both ends of the front subframe body. A front subframe structure for an automobile, characterized in that a lower arm bracket is fixedly joined to a top member and a lower member on both sides of a front subframe main body so as to form a closed cross section.