JPH0544229Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the front body structure of an automobile, and more particularly to an improved structure of a support portion for attaching the rear end portion of a suspension member to a darts cross member.

[Prior art]

In general, the darts cross member at the bottom of the darts panel in the front body structure of an automobile is a strength member that spans between the left and right side sills, and this darts cross member is usually attached to the sloped wall at the bottom of the dash panel and its outer surface. It has a closed cross-sectional shape with the cross member.

Both left and right ends of the above-mentioned darts cross member constitute a wheel house portion corresponding to the rear lower part of the wheel house, and the lower end of the darts cross member on the vehicle width center side from this wheel house portion is where the front wheels are placed. The rear ends of the suspension members of the suspension device are connected.

Since the wheel house portion of the dart cross member is curved, it is somewhat disadvantageous in terms of ensuring the rigidity of the lateral strength of the vehicle body.

Therefore, for example, in Japanese Utility Model Application Publication No. 57-29480,
A reinforcement member is provided inside the darts cross member at a position corresponding to the wheel house portion of the darts cross member, the reinforcement member and the cross member constitute a closed section, and the outer end of the closed section It is described that the connecting structure between the side sill and the dart cross member is strengthened by connecting the part to the side sill.

[Problem that the invention attempts to solve]

Like the vehicle front structure described in the above publication,
By reinforcing it with a reinforcement member, the joint structure between the side sill and the dart cross member will be strengthened.

By the way, not only is the rear end of the suspension member connected to the part slightly inside the wheel house part of the above-mentioned dart cross member, but also the side frames arranged on both the left and right sides of the engine room are connected to that part. Since the rear end is also generally connected, a considerable load is applied to that part from the suspension device and side frame.

However, in the conventional front body structure, the dart cross member that connects the suspension member and the rear end of the side frame is composed of a plate-shaped cross member, so sufficient rigidity and strength cannot be ensured. It's not enough on the surface.

[Means for solving problems]

In the front body structure of an automobile according to the present invention, a side sill with a closed cross section extending in the front and rear direction is provided at the side end of the floor panel, and a closed cross section extending in the vehicle width direction is formed by a diagonal wall section at the lower part of the dash panel and a cross member. A darts cross member is provided which is formed in a shape and has both ends joined to the side sills, a reinforcement extending from the side sill toward the center of the vehicle width from the wheel house portion is provided in the darts cross member, and an outer end of the reinforcement is provided. is joined to the side sill, and the reinforcement and the wheel house part of the cross member form a closed cross section, and the outer end of this closed cross section is joined to the side sill while keeping the closed cross section continuous, and the closed cross section is joined to the side sill. A state in which the inner end extending toward the center of the vehicle width and having an L-shaped cross section consisting of a horizontal wall and a vertical wall overlaps the bottom wall and vertical wall of the cross member. The inner end of the reinforcement and the cross member constitute a support part that supports the rear end of the suspension member, and the rear end of the side frame is joined to the support part via the cross member. This is what I did.

[Effect]

In the front body structure of an automobile according to the present invention, the left and right side sills are strongly connected to each other by the darts cross member, which is composed of a sloped wall section at the lower part of the darts panel and a cross member. The reinforcement provided in the cross section and the wheel house of the cross member form a closed cross section, and the outer end of the closed cross section is joined to the side sill while keeping the closed cross section continuous. The rigidity and strength of the part corresponding to the wheel house will be reinforced, and the joint structure between the side sill and the dart cross member will be effectively reinforced.

Also, a cross section L consisting of a horizontal wall portion and a vertical wall portion is the inner end portion of the reinforcement extending toward the vehicle width center side from the wheel house portion of the cross member.
The inner end of the shape is joined to the bottom wall and vertical wall of the cross member in an overlapping state, and the inner end of the reinforcement and the cross member support the rear end of the suspension member. Since the support part is configured, the support part has sufficient rigidity,
The connection structure between the rear end of the suspension member and the dart cross member is reinforced through this support member, and the input load from the suspension member can be reliably transmitted and dispersed to the side sill side.

Furthermore, since the rear end portion of the side frame is connected to the support portion via the cross member, the input load from the suspension member can be reliably transmitted and dispersed to the side frame side.

[Effect of idea]

According to the front body structure of an automobile according to the present invention,
As explained in detail in the operation section above, by providing a reinforcement inside the outer end portion of the darts cross member, (a) the portion of the darts cross member corresponding to the wheel house can be (b) The joint structure between the darts cross member and the side sills can be strengthened; (c) The support part with sufficient rigidity at the inner end of the reinforcement can strengthen the suspension member. (d) The connection structure between the rear end and the darts cross member can be reinforced, and the input load from the suspension member can be reliably transmitted and distributed to the side sill side. By joining the rear end portion, remarkable effects such as being able to reliably transmit and disperse the input load from the suspension member to the side frame side can be obtained.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 shows the front body structure of an automobile.
A wheel house 2 and a suspension tower 3 rising from the center of the wheel house 2 are provided on both left and right sides of the vehicle body constituting the engine room 1, and side sills are provided at both left and right ends of a darts panel 4 that partitions the engine room 1 and the passenger compartment. It is joined to a hinge pillar 6 rising from 5.

As shown in FIGS. 1 and 2, a pair of left and right side frames 7 extending in the front-rear direction are provided inside the wheel house 2, and the rear ends of these side frames 7 are connected to the dart cross member 8. A suspension set frame 9 is disposed at the rear lower part of each side frame 7 facing in the front-rear direction.The suspension set frame 9 is joined to the lower surface of the rear end of the side frame 7, and the rear end The section is connected to the lower end of the dart cross member 8 as described below.

An A-type suspension arm 10 as a lower arm of the front wheel suspension device is disposed on the outside of each suspension set frame 9, and the front end of each A-type suspension arm 10 is attached to the front end of the suspension set frame 9. It is elastically supported via an elastic bushing and a pin member, and the rear end of the A-type suspension arm 10 is connected to the lower end of the dart cross member 8 via the elastic bushing, as will be described later.

As shown in FIG. 2, the left and right side edges of the floor panel 11 are provided with closed-section side sills 5 extending in the front-rear direction from the rear end of the wheel house 2. The dart lower panel 12 has a hinge pillar 6 standing upright, and constitutes the middle and lower portions of the dash panel 4 that partitions the engine room 1 and the passenger compartment.
Floor portion 12a continuous to the front end of the floor panel 11
, a house side inclined wall part 12b located at the rear of the wheel house 2; a central inclined wall part 12c connected to the inner end of the house side inclined wall part 12b; and a central inclined wall part 12c connected to the upper end of the house side inclined wall part 12b. The wheel house part 12d forms the middle to upper part of the rear part of the wheel house part 12d, and the vertical wall part 12e stands vertically and is connected to the upper end of the wheel house part 12d and the upper end of the central inclined wall part 12c.

The house side inclined wall portion 12b and the central inclined wall portion 12c
The floor part 1 is slanted backwards and downwards.
The rear end portion of the wheel house portion 12a is joined to the front edge of the floor panel 11, the outer end portion of the house side inclined wall portion 12b is joined to the side sill inner 5a of the side sill 5, and the outer end portion of the wheel house portion 12d is joined to the side inner panel. 13, and the upper end of the vertical wall portion 12e is joined to the dash upper panel.

A cross member 14 having an L-shaped cross section is provided on the front side of the house side inclined wall part 12b and the central inclined wall part 12c, and the upper end edge of the cross member 14 is connected to the vertical wall part 12e and the wheel house part 12d. The rear end edge of the cross member 14 is joined to the front end edge of the floor portion 12a, and the outer end of the cross member 14 is joined to the side sill inner 5a and the front surface of the hinge pillar inner 6a.

The house side slanted wall portion 12b and the central slanted wall portion 12c of the above-mentioned darts lower panel 12 and the cross member 14
A dart cross member 8 extending in the vehicle width direction is constituted by the dart cross member 8, and the front ends of the left and right side sills 5 and the lower ends of the left and right hinge pillars 6 are strongly connected to each other by the dart cross member 8.

Although not shown in FIG. 2, as shown in FIG.
As shown in the figure, reinforcements 15 for reinforcing the wheel house portion 14a of the cross member 14 and the surrounding portion thereof are provided in the vicinity of the left and right outer ends of the cross member 14.

The reinforcement 15 has a curved portion 15a forming a closed cross section together with the cross member 14, and an inner end having an L-shaped cross section extending a predetermined length from the inner end of the curved portion 15a toward the center of the vehicle width along the cross member 14. As shown in FIG. 6, the horizontal and vertical walls of the curved portion 15a and the cross member 14 form a closed cross section in which the width in the longitudinal direction increases outward in the vehicle width direction. A flange portion 16 at the front edge of the horizontal wall portion is joined to the cross member 14, a flange portion 17 at the lower edge of the vertical wall portion is joined to the cross member 14, and a flange portion 17 at the outer end of the horizontal wall portion is joined to the cross member 14. The portion 18 and the flange portion 19 at the outer end of the vertical wall portion are joined to the side sill inner 5a.

Inner end 15b of the reinforcement 15
A reinforcing flange portion 20 that is strongly joined to the bottom wall of the cross member 14, and a vertical wall that rises from the front end of the reinforcing flange portion 20 along the vertical wall portion of the cross member 14 and is strongly joined to the vertical wall portion. 21.

As shown in FIGS. 4 and 5, the rear end of the bottom wall of the side frame 7 extends below the reinforcing flange 20 to the lower surface of the bottom wall of the cross member 14, and is integrally welded. is joined to.

A rear end portion 9a of the suspension set frame 9 is disposed on the lower surface side of the joint flange portion 7a of the side frame 7 joined to the bottom wall portion,
The rear end portion 9a of the suspension set frame 9 connects itself to the connecting flange portion 7a and the cross member 1.
A pair of left and right bolts 22 passed through the bottom wall of 4.
The pivot shaft 10a, which is fixed via a nut 23 and a nut set plate 24 joined to the cross member 14, and which is provided in the front-rear direction at the rear end of the A-type suspension arm 10, is a suspension set frame. An elastic bushing 25 disposed on the lower surface side of the bolt 9 and fitted onto the pivot shaft 10a thereof, a connecting fitting 26 disposed so as to press the elastic bushing 25 from the lower surface side, and one of the bolts 22 and the bolt. It is connected to the rear end 9a of the suspension set frame 9 via a nut 27.

In the front body structure of the automobile described above, the reinforcement 15 is disposed in the dead space inside the dart cross member 8, and the reinforcement 15 and the cross member 14 form the wheel house portion 14a of the cross member 14. Since the reinforcing closed cross section is formed, the connection structure between the dart cross member 8, side sill 5, and hinge pillar 6 is significantly strengthened.

The inner end 15b of the reinforcement 15 is strongly joined to the cross member 14, and the reinforcement flange 20 of the inner end 15b and the bottom wall of the cross member 14 support the side frame 7. It is a joint part that joins the joint flange part 7a at the rear end, and also connects the A-type suspension arm 10.
The support part that connects the rear end of the can be strongly reinforced.

In the event of a frontal collision of an automobile, the load transmitted from the side frame 7 to the dart cross member 8 is transmitted to the side sill 5 and hinge pillar 6 via the reinforcement 15, so that the weight strength of the vehicle body is also significantly improved. It turns out.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic perspective view of the front structure of the vehicle body, FIG. The figure is a perspective view showing the reinforcement and cross member, Figure 4 is a cross-sectional plan view of the main part of the front vehicle body structure, Figure 5 is a sectional view taken along the line shown in Figure 4, and Figure 6 is taken along the line taken in Figure 3. FIG. 5...Side sill, 8...Dutch cross member, 11...Floor panel, 12...Dutch lower panel, 12b...House side slanted wall part, 12c
...Central slanted wall section, 14...Cross member, 15
...Reinforcement, 15b...Inner end,
20...Reinforcement flange part.

Claims (1)

[Scope of Claim for Utility Model Registration] A side sill with a closed cross-section extending in the longitudinal direction is provided at the side end of the floor panel, and the side sill is formed with a closed cross-section extending in the vehicle width direction by the diagonal wall at the bottom of the dash panel and the cross member. a darts cross member joined to the side sill, a reinforcement extending from the side sill to the wheel house toward the center of the vehicle width is provided within the darts cross member, and an outer end of the reinforcement is joined to the side sill. At the same time, the reinforcement and the wheel house part of the cross member form a closed section, and the outer end of this closed section is joined to the side sill while keeping the closed section continuous, so that the vehicle width is wider than the closed section. A cross section L that is an inner end portion extending toward the center and is composed of a horizontal wall portion and a vertical wall portion.
The inner end of the shape is joined to the bottom wall and vertical wall of the cross member in an overlapping state, and the rear end of the suspension member is supported by the inner end of the reinforcement and the cross member. A front body structure for an automobile, comprising a support part, and a rear end part of a side frame is joined to the support part via a cross member.