JPH044945Y2 - - 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 that support the engine, suspension, steering, etc. at the front lower part of the vehicle.

Therefore, in this invention, an upper member and a lower member made of plate materials are joined through a hollow part to form a front sub-frame body with a so-called box-shaped cross section attached to the front underbody, and furthermore, both ends of the front sub-frame body are attached to the front underbody. A notch opening is formed in the opening, and a box-shaped lower arm bracket having a front lower arm support plate and a rear lower arm support plate and having an open bottom and one side for pivotally supporting the lower arm is interposed in the opening. This invention relates to a front subframe structure of a car that is joined together, and in particular, reinforcements are fixed by overlapping their front edges from the top surface to the side of a lower arm bracket formed in a box shape, and are further joined to each other. The lower arm bracket and the reinforcement are joined and fixed to the inside of the opening of the front subframe body at each front and rear portion sandwiching the lower arm bracket and the rear lower arm support plate, and the reinforcement has its rear edge extending across the front subframe body. This invention relates to a front subframe structure of an automobile in which the upper member and the lower member are interposedly joined at each joint at the end thereof.

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

Among these, in recent years, 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. In recent years, front engine front drive It is widely used in cars, etc.

Generally, large loads are constantly applied to the front subframe from multiple directions due to attached components such as the engine and suspension steering, so high rigidity is required to sufficiently support such loads. Ru.

Therefore, in the past, the front subframe was formed into a closed cross-sectional structure by joining the openings of the upper member and lower member, which are made of steel plates and have a substantially U-shaped cross section, in order to reduce the weight of the members. The aim was to improve the

Furthermore, when the lower arm is supported on both sides 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 often locked through the lower arm bracket. However, this method relies only on the connection with one member (lower member) to fix the lower arm bracket to the front subframe body, which consists of the upper member and the lower member, and the rigidity of that joint is not sufficient, so it has not been adopted recently. As disclosed in Japanese Utility Model Publication No. 2-374 and the drawings, a mode has also been devised in which the lower arm bracket is joined to each surface of the upper member and lower member of the front subframe body to further improve the rigidity of the joint. ing.

<Problems that the invention attempts to solve> However, the above-mentioned Utility Model Publication No. 2-374 and
The embodiments disclosed in the drawings are as shown in FIGS. 8 and 9,
A lower arm having a pair of lower arm support plates 4, 4' formed in a substantially U-shaped cross section and facing each other at the opening of a front subframe main body 3 having a closed cross-section structure in which a top member 1 and a lower member 2 are joined to each other. The bracket 5 is interposed, and the top surface of the lower arm bracket 5, which has a substantially U-shaped cross section, and the upper member 1, and the base end of one opening of the U-shaped cross section of the lower arm bracket 5, and the lower member 2 are connected to each other. Because of this structure, the lower arm bracket 5 cannot sufficiently function as a so-called bulk head that supports the opening of the front subframe main body 3 and prevents its cross section from collapsing. There was a problem in that the input from the lower arm was difficult to be organically transmitted to the front subframe main body 3.

Generally speaking, in order to improve the handling stability of an automobile, reliable support for the suspension is required, and for this purpose, the organic structure between the lower arm bracket, which is the load input part from the lower arm, and the front subframe body is required. Bonding is desired.

The purpose of this invention is to solve the technical problem of the automobile front subframe structure based on the above-mentioned conventional technology, and to solve the problem of the front subframe body which is directly fixed to the lower arm bracket which is the load input part from the lower arm and the chassis. The purpose of the present invention is to provide an excellent automobile front subframe structure that improves the stiffness of the joints and improves the handling stability and durability of the vehicle, thereby benefiting the field of reinforcing material use in the automobile industry. be.

<Means and actions for solving the problems> 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 claims, is to solve the above-mentioned problems. An opening is formed at both ends of the front subframe main body, which is formed in a closed cross-sectional shape through the opening, and a front lower arm support plate and a rear lower arm support plate are provided in the opening to pivotally support the lower arm. A box-shaped lower arm bracket with an open bottom and one side is interposed, and a reinforcement is fixed from the top surface to the side of the box-shaped lower arm bracket so that the front edges thereof are overlapped, Furthermore, in this state, the lower arm bracket and the reinforcement are joined and fixed to the inside of the opening of the front subframe main body at the front and rear parts of the lower arm bracket that sandwich the rear lower arm support plate, and the rear edge of the reinforcement is connected to the inside of the opening of the front subframe body. The lower arm bracket, which is a direct load input part from the lower arm, and the front subframe main body are reinforced by being interposed and fixed at each joining site of both ends of the upper member and lower member across the formed closed cross section. This technique takes technical measures to enable more organic bonding through the cement.

<Example> Next, an example of this invention will be described below based on FIGS. 1 to 7. In addition, the 8th and 9th
Components in the same manner as the conventional aspect shown in the drawings will be described using the same reference numerals.

6 is the front subframe of this invention,
As shown in FIG. 7, a front cross member 8 at the front end of the vehicle is interposed between front side members 7 running on both sides of the vehicle in parallel with a front cross member 8, and a center member 9 is attached to the upper center of the front cross member 8. Lower arms 10, 10 supporting the suspension are held at the lower arms 10, 10, which support the suspension.

The front sub-frame 6 has an upper member 1 and a lower member 2 made of steel plates, whose outer flange parts are joined to each other to form a so-called hollow-shaped closed cross-sectional structure, while the overall shape is approximately H-shaped in plan view. The upper member 1 and the lower member 2 at the front ends of the widened portions at both ends have cutout-like openings, into which the lower arm bracket 5' is attached.

The lower arm bracket 5' has a box section 11 whose lower surface and one side are open, and the mutually opposing vertical surfaces of the box section 11 are connected to a front lower arm support plate 12,
A rear lower arm support plate 13 is provided, and a predetermined interval is provided between the front lower arm support plate 12 and the rear lower arm support plate 13 so that a front bush (not shown) of the lower arm 10 is interposed therebetween.

A flange 14 extending in the horizontal direction is integrally formed on the outer peripheral portion of the lower end of the box portion 11.
Particularly, its rear portion is a bulging portion 15 that bulges out in a predetermined shape toward the rear of the vehicle.

Insertion holes 16, 16 into which a shaft is inserted to support the lower arm 10 are bored in the center of each of the front lower arm support plate 12 and the rear lower arm support plate 13.
A through hole 17 for a bolt for mounting the body is bored at a predetermined location.

Reference numeral 18 denotes a reinforcement, whose overall shape extends from the front toward the rear of the vehicle and toward the inside of the vehicle, that is, approximately L-shaped in plan view, and its front edge extends toward the inside of the vehicle. It is formed to have a substantially L-shaped cross section with a vertical surface 19, and a flange 20 extending in the horizontal direction is integrally formed at the lower end of the vertical surface 19.

An outer edge 21 of the rear edge of the reinforcement 18 extending from the upper surface of the front edge toward the rear of the vehicle is formed to extend horizontally from the upper surface of the front edge toward the inner side of the vehicle. The part continuing from the front edge is gently inclined downward and its tip extends horizontally, forming an inner bulging surface 22.Furthermore, the vertical surface 19 and flange 20 of the front edge are gradually inclined downward toward the inside of the vehicle. It is gently curved, and its tip is integrated with an inner bulging surface 22 extending horizontally.

In addition, an insertion hole 17' corresponding to the insertion hole 17 of the lower arm bracket 5' is bored in a predetermined portion of the upper surface of the reinforcement 18, and the flange 2
A bent portion 23 is formed at the edge extending from the inner bulging surface 22 to maintain the overall shape of the reinforcement 18.

The front edge of the reinforcement 18, which has a substantially L-shaped cross section, overlaps the upper surface and side surfaces of the box portion 11 of the lower arm bracket 5'. The upper surface of the flange 14 is welded and fixed to the lower surface of the top of the front edge of the reinforcement 18, the vertical surface 19, and the lower surface of the flange 20, respectively.

Furthermore, lower arm bracket 5' and reinforcement
When the reinforcement 19 is attached to the front subframe main body 3, the lower arm bracket 5' and the reinforcement 18 have their rear ends interposed in the notch openings at the front ends of the widened parts at both ends of the front subframe main body 3, Lower arm bracket 5'
A predetermined portion on each outer surface of the reinforcement 18 and a predetermined portion on each inner surface of the upper member 1 and lower member 2 are welded and joined as appropriate.

At this time, the outer surface extending from the reinforcement 18 to the front lower arm support plate 12 of the lower arm bracket 5' is covered by the extension of the front end of the widened part of the upper member 1, and the rear lower arm support plate of the lower arm bracket 5' plate 1
Near the outer periphery of the rear lower arm support plate 13, the front and rear upper surfaces and one side (vehicle inner side) of the rear lower arm support plate 13 are welded to the inner side of the upper member 1 via a reinforcement 18.

Further, the reinforcement 18 has a bulging surface 2.
The front end of the upper member 1 and the lower member 2 is welded and fixed to the upper member 1 and the lower member 2 while the front end thereof is clamped to the front flange joint surface of the upper member 1 and the lower member 2 together with the flange 14 of the lower arm bracket 5'. The ends are welded and fixed to the upper member 1 and lower member 2 in a state in which they are similarly clamped to the rear flange joint surfaces of the upper member 1 and lower member 2, and the outer edge 21 of the upper member 1 and the lower member 2 is also attached to the upper member 1 and lower member 2 from the outside of the vehicle. It is interposed and fixed by welding on the joint surface of.

In addition, the insertion hole 17' of the reinforcement 18 and the insertion hole 1 of the lower arm bracket 5' are provided at predetermined locations on the upper surface of the upper member 1 and the lower surface of the lower member 2.
Through-holes 24 and 24' corresponding to each of the front sub-frames 6 and 7 are bored, and bolts are inserted into each of the through-holes 24', 17, 17' and 24 in sequence, so that the front sub-frame 6 is joined to the body. ing.

In the above configuration, various loads applied to the front suspension when the vehicle is running are handled by the lower arm 10.
The front lower arm support plate 12 portion of the lower arm bracket 5′, which directly supports the front bushing portion of the lower arm 10, is applied from behind to the front end of the widened portion of the upper member 1. A rear lower arm support plate 13 of the lower arm bracket 5' which is covered and overlapped by the protrusion and also directly supports the front bushing portion of the lower arm 10.
The portion is welded to the upper member 1 at each front and rear portion of the rear lower arm support plate 13 together with the reinforcement 18 with its upper surface and one side surface (inside the vehicle) overlapped with the front edge of the reinforcement 18, Further, the upper member 1 and the lower member 2 are connected so that the rear edge of the reinforcement 18 crosses the closed cross section of the front subframe main body 3.
Since the lower arm bracket 5' and the front subframe main body 3 are joined organically, the load applied from the suspension via the lower arm 10 is smoothly connected to the front subframe body 3. It is transmitted to the main body 3 and supported in a distributed manner.

At this time, the rear lower arm support plate 13 of the lower arm bracket 5' closes the notch opening at the front end of the widened part of the front subframe main body 3, forms a closed cross section with the upper member 1 and lower member 2, and functions as a so-called bulk head. However, since the rear lower arm support plate 13 is welded to the upper member 1 at each of its front and rear parts via the reinforcement 18 as described above,
It is possible to reliably prevent the cross section of the closed cross section formed by the upper member 1 and the lower member 2 from collapsing, and furthermore, the reinforcement 18 extends from the rear of the vehicle toward the inside of the vehicle, and the reinforcement 18 extends from the rear of the vehicle toward the inside of the vehicle, and the front and rear edges of the inner bulging surface 22 of the reinforcement 18 are and the outer edge 21 are interposedly joined to the upper member 1 and lower member 2, so stress is constantly applied in the shape-retaining direction against cross-sectional collapse of the upper member 1 and lower member 2, and lower arm bracket 5' and front subframe main body 3 is organically combined with higher rigidity.

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

<Effects of the invention> As described above, according to this invention, it is basically possible to increase the rigidity of the joint between the lower arm bracket, which is the load input part from the lower arm, and the front subframe body, which is directly fixed to the chassis. Therefore, an excellent effect is achieved in that the steering stability and durability of the vehicle can be reliably improved.

That is, the front edge of the reinforcement is overlapped and fixed from the top surface to the side surface of the lower arm bracket, and furthermore, in this state, the lower arm bracket and the reinforcement are box-shaped at each of the front and rear parts of the lower arm bracket that sandwich the rear lower arm support plate. By being fixed to the inside of the opening at both ends of the front subframe main body, which is formed in a closed cross-sectional shape, the rear lower arm support plate of the lower arm bracket that supports the lower arm can be attached to both the front and rear parts of the front subframe body. - The reinforcement is organically joined to the front subframe main body via the reinforcement, and furthermore, at that time, the reinforcement crosses the closed cross section formed by the upper member and the lower member and connects to each joint at both ends of the upper member and the lower member. This arrangement prevents the front subframe body, which consists of the upper member and lower member, from collapsing in cross section, and as a result, the excellent effect of reliably improving the rigidity of the joint where the lower arm is attached is achieved. Ru.

[Brief explanation of the drawing]

1 to 7 show one embodiment of this invention, FIGS. 1 and 2 are partial perspective views, FIG. 3 is a partial plan view, FIG. 4 is a corresponding sectional view of FIG. 3, and FIG. 5
The figure is a sectional view corresponding to Fig. 3, Fig. 6 is a sectional view corresponding to Fig. 3, Fig. 7 is a plan view, and Fig. 8, 9 is a corresponding sectional view.
The drawings show a conventional aspect, and FIG. 8 is a partial plan view, and FIG. 9 is a sectional view taken along A-B-C-D-E in FIG. 8. 1... Atsupa member, 2... Roa member, 3...
...Front subframe body, 12...Front lower arm support plate, 13...Rear lower arm support plate, 5'...Lower arm bracket, 6
...Front subframe, 18...Reinforcement
Sment.

Claims (1)

[Scope of utility model registration request] A front subframe body is formed by joining a top member and a lower member formed of plate materials through a hollow part, and openings are formed at both ends of the front subframe body, and front lower arm support plates face each other. and a rear lower arm support plate, and a box-shaped lower arm bracket with an open bottom and one side is interposed in the opening and connected to the upper member and the lower member, respectively. The reinforcement is fixed in an overlapping manner from the top surface to the side surface of the bracket, and the overlapping lower arm bracket and reinforcement are joined and fixed to the opening of the front subframe main body before and after the rear lower arm support plate of the lower arm bracket. . A front subframe structure for an automobile, further comprising a reinforcement interposed at each joint at both ends of the upper member and the lower member across a closed cross section formed by the upper member and the lower member.