KR20080016090A - Sub-frame structure in automobile - Google Patents

Abstract

A sub-frame structure in an automobile is provided to prevent the front part of the vehicle body from being twisted when the automobile is turned and to increase turning stability by forming a mounting part of a suspension arm at a rear member integrally and mounting a reinforcing member. A sub-frame structure in an automobile has a square shape by connecting a front member(1), a rear member(2), and two side members(3) sequentially. The rear member is combined with a rear end of a low arm(5) comprising the suspension arm. A reinforcing member is mounted between the rear ends of the rear member and the low arm to increase the rigidity of the combing part. The rear member has a Ý‹ channel shape. Mounting parts(4a,4b) are formed at the rear ends of the side member. Brackets(6) are installed at the side member to combine the shear part of the low arm.

Description

Sub-frame Structure in automobile}

1 is a perspective view of a subframe according to the prior art,

2 is a perspective view of a combination of subframes according to the present invention;

3 is a detailed view of main parts of a subframe according to the present invention;

4 is an exploded perspective view of a subframe according to the present invention.

<Description of Symbols for Main Parts of Drawings>

1-front member 2-rear member

3-side member 4a, 4b-mounting

5-low arm 6-bracket

7-stay

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subframe of an automobile, and in particular, a low arm mounting portion is integrally formed on a subframe rear member coupled to two side members, and a U-shaped stay is attached to the low arm mounting portion to provide structural rigidity. It relates to a subframe structure of a vehicle to increase the.

In general, a subframe of a vehicle is installed in a vehicle body constituting an engine room, and is supported by mounting an engine and a transmission installed in the engine room, and a suspension arm of a suspension device, such as a low arm, is connected. While increasing the function to facilitate the load transfer is made.

1 is a perspective view of the conventional sub-frame as described above, that is, the sub-frame front member 10 formed to extend in the width direction of the vehicle while being located in front of the engine room, and located behind the engine room, Each of the four members includes a subframe rear member 11 extending in the width direction of the vehicle and two subframe side members 12 extending in the longitudinal direction of the vehicle for both sides of the engine room. They are generally connected in series to form a square shape.

Such a subframe includes two subframe front mounting parts 13a provided at a coupling part to which the front member and the two side members are coupled, and two subframes respectively mounted at rear ends of the two side members. The vehicle is mounted on the vehicle body at four points via the frame rear mounting portion 13b to be supported.

Both sides of the lower arm 14 constituting the suspension arm are mounted and supported on the upper surface along the longitudinal direction of each side member 12. Each of the side members has a front mounting bracket 15a and a rear of the lower arm. Mounting brackets 15b are mounted, respectively, so that both ends of the row arms are attached to and supported by the side members via the brackets 15a and 15b and bushes.

When the vehicle equipped with the conventional subframe as described above turns, in the engine room, the left and right reaction forces are transmitted to the low arms mounted on the subframe by a torsion effect according to the reaction force in the turning direction of the vehicle. In this step, a torsion phenomenon occurs in the opening in the interior of the vehicle, and in the third step, residual vibration is transmitted by the torsion of the rear floor, and the low arm mounting part causes the low arm to act upon the left and right reaction forces caused by the turning of the vehicle. In the front mounting portion 15a and the low arm rear mounting portion 15b, the displacement of each rubber bush is excessive, resulting in an unsatisfactory handling performance of the vehicle and a deterioration in ride quality due to vibration and noise of the vehicle body. .

Accordingly, the present invention has been made in view of the above-described circumstances, and further includes an additional reinforcing member which integrally forms the mounting portion of the suspension arm on the rear member constituting the subframe and increases the structural rigidity of the suspension arm mounting portion. It is an object of the present invention to provide a subframe structure of a vehicle, which improves the handling performance while improving the steering performance by suppressing the torsion of the front part of the vehicle body when the vehicle is turning.

According to the present invention for achieving the above object, the front member, the rear member and the two side members are continuously connected to each other to form a quadrangular shape, and the rear end portion of the low arm constituting the suspension arm is directly fastened to the rear member. And a reinforcing member for increasing fastening part rigidity between the rear member and the rear end of the low arm.

Preferably, the rear member is formed to form a U-channel shape.

In addition, while the reinforcing member has a U-shape, the bent portion is fastened to the rear member, while both front end portions of the reinforcement member are fastened back and forth around the fastening portion, and are fastened to the side member.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view of the combined subframe according to the present invention, Figure 3 is a detailed view of the main part of the subframe according to the present invention, Figure 4 is an exploded perspective view of the subframe according to the present invention is shown That is, the subframe front member 1 formed in front of the engine room and extending in the width direction of the vehicle, and the subframe rear member 2 positioned in the rear of the engine room and extending in the width direction of the vehicle In addition, two subframe side members 3 are formed on both sides of the engine room and extend in the longitudinal direction of the vehicle, and the four members are continuously connected to form a substantially rectangular shape.

The subframe includes two subframe front mounting units 4a installed at a coupling unit to which the front member and the two side members are coupled, and two subframe rears respectively mounted at rear ends of the two side members. The mounting part 4b is supported by being mounted on the vehicle body at four points.

The rear member 2 has a structure in which the front end portion of the lower arm 5 constituting the suspension arm having a substantially C-shaped channel shape can be directly mounted without using a separate bracket.

That is, by inserting the rear end of the low arm into the U-channel, it is possible to fasten and support the low arm directly to the rear member via a bolt, the front end of the low arm bracket (6) mounted on each side member It is mounted on the side member through the bush.

In order to increase the rigidity of the fastening portion between the rear end portion of the low arm and the rear member, a generally 7-shaped stay 7 is fastened to the rear member and the side member, respectively. While the bent portion is fastened to the rear member, both ends of the stay are fastened to the side member at two positions in a shape that is spread back and forth around the fastening portion of the low arm.

As described above, the rear end of the low arm is directly inserted into and fastened to the rear member without using a separate bracket, and as the U-shaped stay reinforcing member is attached to the fastening portion, the rigidity of the subframe fastening portion of the low arm is remarkably increased. The low arm can be stably supported on the subframe, and the rigidity of the subframe itself is also increased, and even if an external force is applied to the subframe through the low arm in the lateral direction, the amount of torsion of the subframe and the vehicle body supporting it is reduced. Not only can the swing stability be improved at the time of turning, the handling performance is also improved, and the vehicle body can be stabilized to improve the merchandise.

As described above, according to the subframe structure of the vehicle according to the present invention, the low arm is fastened by directly inserting and tightening the rear arm of the low arm constituting the suspension arm without using a separate bracket. The secondary rigidity is increased, and the structural rigidity of the subframe and the body supporting the body is improved by attaching the stay to each fastening part to further increase the rigidity of the fastening part, thus effectively responding when external force is applied to the subframe and the body. By stabilizing the car body and improving the handling performance, it is possible to improve the merchandise.

Claims (4)

The front member, the rear member, and the two side members are connected in series to form a quadrangular shape. A rear end portion of the low arm constituting the suspension arm is directly fastened to the rear member, and between the rear member and the rear end portion of the low arm. Subframe structure of a vehicle equipped with a reinforcing member to increase the rigidity of the fastening portion. The subframe structure of a vehicle according to claim 1, wherein the rear member is formed to have a C channel shape. According to claim 1, wherein the reinforcing member has a U-shape, the bent portion is fastened to the rear member while the front end of both sides of the automobile is characterized in that the front and rear open about the fastening portion is fastened to the side member Subframe structure. According to claim 3, A coupling portion for mounting the front member and the side member, and a mounting portion for mounting to the vehicle body at the rear end of the side member, respectively, the side member is fastened to the front end of the low arm Subframe structure of a vehicle, characterized in that the bracket is installed.

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