CN211592143U - Bracket mounting structure for lower arm - Google Patents

Abstract

The utility model provides a bracket mounting structure of a lower arm. In this mounting structure, the lower arm is provided on the suspension of the vehicle and includes a lower plate and a bracket, and the front arm and the rear arm extending from the inner side of the lower plate in the vehicle width direction to the inner side in the vehicle width direction are respectively connected to the suspension of the vehicle. Frame beam connection, the other side of the lower plate on the outer side in the vehicle width direction is joined to the bracket by welding, when viewed from above the vehicle, the end point on the front side in the vehicle length direction of the welded joint between the lower plate and the bracket is welded. The virtual straight line passing through the end points on the rear side in the vehicle length direction of the part is inclined with respect to the vehicle length direction of the vehicle, and the welded joint part has a plurality of bent parts when viewed from above the vehicle. Based on the above structure of the present invention, the bracket can be reduced in size and weight, and the stress on the welded joint can be dispersed, and the strength of the welded joint can be improved.

Description

Bracket mounting structure for lower arm

technical field

The utility model relates to a bracket mounting structure of a lower arm arranged on a vehicle suspension.

Background technique

Conventionally, as a lower arm provided on a vehicle suspension, a structure in which a forged ball joint bracket (hereinafter simply referred to as a "bracket") is welded to a lower plate composed of a plate is widely used. The welded joint where the lower plate and the bracket are joined is required to have high strength because it receives a load from the road surface or the like.

FIG. 3A shows a bracket mounting structure of a lower arm 300 in the prior art. As shown in FIG. 3A , the lower plate 310 of the lower arm 300 and the bracket 350 are joined by welding to form a welded joint (welded surface) 370 extending straight in the vehicle length direction. Since the welded joint portion 370 extends straight in the vehicle length direction, the entire welded joint portion 370 parallel to the vehicle length direction is able to withstand the bending stress (the force that bends the bracket 350 in the vehicle length direction from the up-down direction). part, so that local stress concentration on the welded joint 370 can be avoided.

However, in the case of employing the structure in which the welded joint 370 extends straight in the vehicle length direction, the shape of the bracket 350 is limited. Therefore, it is difficult to achieve miniaturization and weight reduction of the bracket 350 .

FIG. 3B shows another bracket mounting structure of the lower arm 400 in the prior art. As shown in FIG. 3B , the lower plate 410 of the lower arm 400 and the bracket 450 are joined by welding, thereby forming a welded joint 470 . In order to reduce the size of the bracket 450, a part of the welded joint 470 is formed so as to be inclined in the vehicle length direction.

However, in the case of adopting a structure in which a part of the welded joint 470 is inclined to the vehicle length direction, since a part of the welded joint 470 is inclined to the vehicle length direction, the part receiving the above-mentioned bending stress is mainly parallel to the vehicle length direction. The other part, that is, the area AR in FIG. 3B . Therefore, there is a problem that the stress is concentrated on the area AR and the strength of the welded joint 470 is lowered.

Utility model content

In view of the above technical problems, the purpose of the present invention is to provide a bracket that is joined to the lower arm by welding, which can not only realize the miniaturization and weight reduction of the bracket, but also disperse the stress acting on the welding joint, thereby The bracket mounting structure of the lower arm can improve the strength of the welded joint.

As a technical solution to solve the above technical problems, the present invention provides a bracket mounting structure for a lower arm. In the bracket mounting structure for the lower arm, the lower arm is arranged on the suspension of the vehicle and has a lower plate and a bracket, from which the lower arm is mounted. The front arm and the rear arm extending from the inner side in the vehicle width direction of the lower plate to the inner side in the vehicle width direction are respectively connected to the suspension beam of the vehicle, and the other side of the lower plate located at the outer side in the vehicle width direction is respectively connected. The bracket to which the wheel carrier of the vehicle is connected is joined by welding, wherein the front side in the vehicle length direction of the welded joint between the lower plate and the bracket is viewed from above the vehicle in a plan view. A virtual straight line passing through the end point and the end point on the rear side in the vehicle length direction of the welded joint portion is inclined with respect to the vehicle length direction of the vehicle, and the welded joint portion has a plurality of curved portions when viewed from above the vehicle.

The above-mentioned bracket mounting structure for the lower arm of the present invention has the advantage that a virtual straight line passing through the end point on the front side in the vehicle length direction of the welded joint and the end point on the rear side in the vehicle length direction of the welded joint is inclined to the vehicle length direction of the vehicle Therefore, it is easy to reduce the size and weight of the bracket. In addition, the welded joint has a plurality of curved portions when viewed from above the vehicle, so that the welding area of the welded joint is increased, and the stress acting on the welded joint can be dispersed. , Improve the strength of welded joints.

In addition, in the above-mentioned bracket mounting structure for the lower arm of the present invention, it is preferable that, when viewed from above the vehicle, the welded joint portion has a convex curved portion bulging outward in the vehicle width direction, and a convex curved portion protruding toward the outside in the vehicle width direction. A concave curved portion that bulges inward in the vehicle width direction. With this configuration, since the welded joint has the convexly curved portion and the concavely curved portion, the area of the welded portion that bears the bending stress (the force that bends the bracket from the vertical direction to the vehicle length direction) can be effectively increased.

In addition, in the bracket mounting structure for the lower arm of the present invention, preferably, the convex curved portion is located on the front side in the vehicle length direction of the welded joint portion, and the concave curved portion is located on the front side of the welded joint portion. On the rear side in the vehicle length direction, the curvature radius of the concave curved portion is larger than the curvature radius of the convex curved portion. With this configuration, since the radius of curvature of the concave curved portion on the rear side in the vehicle length direction is larger than the radius of curvature of the convex curved portion on the front side in the vehicle length direction, the concave curved portion located on the rear side that mainly bears the above-mentioned bending stress can be made increased welding area.

In addition, in the bracket mounting structure for the lower arm of the present invention, it is preferable that the end point on the front side in the vehicle length direction is located on the outer side in the vehicle width direction than the end point on the rear side in the vehicle length direction. With this configuration, since the end point on the front side is located on the outer side in the vehicle width direction than the end point on the rear side, the strength of the welded joint to withstand a load from the front of the vehicle can be improved.

Description of drawings

1 : is a top view which shows the bracket attachment structure which concerns on embodiment of this invention.

FIG. 2 is an enlarged plan view showing the bracket mounting structure shown in FIG. 1 .

FIG. 3A is a plan view showing a bracket mounting structure of the prior art.

FIG. 3B is a plan view showing another bracket mounting structure of the prior art.

Detailed ways

Hereinafter, the bracket attachment structure of the lower arm according to the embodiment of the present invention will be described with reference to the drawings. In the following description, "the bracket mounting structure of the lower arm" is simply referred to as "the bracket mounting structure".

FIG. 1 is a plan view showing a lower arm 200 to which the stand mounting structure 100 of the present embodiment is applied. In the following figures, arrow F represents the front side of the vehicle; arrow B represents the rear side of the vehicle; arrow R represents the right side of the vehicle; arrow L represents the left side of the vehicle; arrow U represents the upper side of the vehicle; and arrow D represents the lower side of the vehicle.

The lower arm 200 is provided on the front suspension of the vehicle. The lower arm 200 includes the lower plate 10 and the bracket 50 .

The lower board 10 has a board main body 11 , a first arm (front arm) 21 and a second arm (rear arm) 22 . The lower plate 10 is obtained by pressing a plate into a member having a U-shaped cross-section.

The panel main body 11 constitutes the main body of the lower panel 10 , and the first arm 21 and the second arm 22 respectively extend in a V-shape from one side of the panel main body 11 located on the inner side in the vehicle width direction.

The first arm 21 is configured to extend from an end portion of the panel main body 11 on the front side (F side) in the vehicle length direction to the inner side (L side) in the vehicle width direction. A first connecting portion 31 that is connected to a suspension member (not shown) of the vehicle is attached to the end of the first arm 21 .

The second arm 22 is configured to extend inward in the vehicle width direction from an end portion of the panel main body 11 on the rear side (B side) in the vehicle length direction. A second connecting portion 32 connected to a suspension member of the vehicle is attached to the end of the second arm 22 .

The lower arm 200 is rotatably supported by the suspension beam of the vehicle by the first connection portion 31 and the second connection portion 32, and is swingably supported by the vehicle body.

The bracket 50 is a ball joint bracket and is connected to a hub carrier (not shown) that supports the wheel. The bracket 50 is formed by forging. The end surface of the lower plate 10 on the other side (R side) on the outer side in the vehicle width direction is joined to the bracket 50 by welding. Here, the portion joined by welding between the bracket 50 and the lower plate 10 is referred to as a welded joint portion (welded joint surface) 70 .

FIG. 2 is an enlarged plan view showing the bracket mounting structure 100 shown in FIG. 1 . In FIG. 2 , the end point on the front side in the vehicle length direction of the welded joint 70 when viewed from above the vehicle is taken as the first end point 71 , and the end point on the rear side in the vehicle length direction of the welded joint 70 when viewed from above the vehicle is taken as the first end point 71 . The second end point 72, and a dashed straight line passing through the first end point 71 and the second end point 72 is taken as the first imaginary line L1.

The welded joint portion 70 is formed such that a first imaginary line L1 passing through the first end point 71 and the second end point 72 is inclined with respect to the vehicle length direction, and the first end point 71 is located further in the vehicle width direction than the second end point 72 outside (R side).

Also, the welded joint portion 70 has a plurality of bent portions. Specifically, the welded joint portion 70 includes a convex curved portion 81 that bulges outward in the vehicle width direction, a concave curved portion 83 that bulges toward the vehicle width direction inner side, and a convex curved portion 81 and a concave curved portion 83 formed by combining the convex curved portion 81 and the concave curved portion 83 . The connected connecting curved portion 85 is constituted.

The convex curved portion 81 is located on the front side in the vehicle length direction, and the concave curved portion 83 is located on the rear side in the vehicle length direction. In addition, the curvature radius of the concave curved portion 83 is larger than the curvature radius of the convex curved portion 81 .

Since the welded joint portion 70 is formed so that the first imaginary line L1 passing through the first end point 71 and the second end point 72 is inclined with respect to the vehicle length direction, it is easy to compare with the structure in which the welded joint portion extends straight ( FIG. 3A ). The miniaturization and weight reduction of the bracket 50 are achieved.

Since the welded joint portion 70 has the convexly curved portion 81 and the concavely curved portion 83, the welding area can be increased. In addition, since the radius of curvature of the concave curved portion 83 is larger than the radius of curvature of the convex curved portion 81, the welding area of the concave curved portion 83 on the rear side that mainly receives the above-mentioned bending stress can be increased, and the effect on welding can be effectively dispersed. Stress of the joint 70 .

In addition, the convexly curved portion 81 is located on the outer side in the vehicle width direction than the concavely curved portion 83 . Therefore, it is easier to achieve miniaturization and weight reduction of the bracket 50 .

As described above, according to the bracket mounting structure 100 of the present embodiment, for the lower arm 200 in which the bracket 50 is welded to the lower plate 10, the bracket 50 can be reduced in size and weight, and can be distributed in the lower arm 200. The stress of the welded joint 70 increases the strength of the welded joint 70 .

The present invention is not limited to the description in the above-mentioned embodiment, and can be appropriately changed. For example, in the above-described embodiment, the welded joint 70 has the convex curved portion 81 , the concave curved portion 83 , and the connecting curved portion 85 , but the number and shape of the curved portions are not limited.

Claims (4)

1. A bracket mounting structure for a lower arm, wherein the lower arm is provided on a suspension of a vehicle, includes a lower plate and a bracket, and extends from a side of the lower plate on the inner side in the vehicle width direction to the inner side in the vehicle width direction The front arm and the rear arm of the vehicle are respectively connected with the suspension beam of the vehicle, and the other side of the lower plate located on the outer side in the width direction of the vehicle is joined with the bracket connected to the wheel frame of the vehicle by welding, and it is characterized in that: When viewed from above the vehicle, a virtual straight line passing through the end point on the front side in the vehicle length direction of the welded joint between the lower plate and the bracket and the end point on the rear side in the vehicle length direction of the welded joint is inclined. in the direction of the length of the vehicle, The welded joint portion has a plurality of curved portions when viewed from above the vehicle. 2. The bracket mounting structure of the lower arm as claimed in claim 1, wherein: When viewed from above the vehicle, the welded joint has a convex curved portion bulging outward in the vehicle width direction, and a concave curved portion bulging toward the vehicle width direction inner side. 3. The bracket mounting structure of the lower arm as claimed in claim 2, wherein: The convex curved portion is located on the front side in the vehicle length direction of the welded joint portion, the concave curved portion is located on the vehicle length direction rear side of the welded joint portion, and the curvature radius of the concave curved portion is larger than that of the convex curved portion. The radius of curvature of the bend. 4. The bracket mounting structure of the lower arm according to any one of claims 1 to 3, wherein: The end point on the front side in the vehicle length direction is located further outside in the vehicle width direction than the end point on the rear side in the vehicle length direction.

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