KR100276703B1 - Subframe of car - Google Patents

Abstract

The present invention relates to a sub-frame of an automobile, wherein the front and left and right members are formed of hollow first pipes 12 formed in a 'c' shape, and the rear members are formed of hollow second pipes 14. One end of the first pipe 12 and the second pipe 14 are welded and bowled to the first press frame 16, respectively, and the other ends of the first pipe 12 and the second pipe 14 are respectively. Welding and bowling are coupled to a second press frame (not shown) to form a structure in which the first pipe 12 and the second pipe 14 are combined to form a subframe using a steel pipe. In addition to securing crash performance, cost savings and durability can be ensured.

Description

Subframe of car

The present invention relates to a subframe of an automobile, and more particularly to a # -type subframe that can be minimized as well as easy to manufacture while ensuring durability and crash performance.

In general, the sub-frame constitutes a skeleton for mounting each device or the body constituting the chassis, and is a portion for supporting the load transmitted to the installed parts or the vehicle body and the reaction force on the front and rear axles. Accordingly, it is necessary to have a strength and rigidity that can sufficiently withstand bending, torsion, tension, vibration, etc., caused by impacts or loads on the road surface which the frame is subjected to while driving a vehicle, and at the same time, lightweight.

1 is a perspective view of a conventional # -type subframe, in which the front-side member 2, the left member 4, the right member 6, and the rear member 8 are '#'. It is combined into a mold.

In the conventional # -type subframe as described above, each member (2), (4), (6), (8) is composed of a press frame, and each member (2), (4), (6), (8 Since the joints are formed by welding, as the structure of the subframe increases, the rate of welding defect increases, which increases the probability of fatigue breakage during use of the vehicle, thereby making it difficult to secure durability.

The present invention is to solve the above problems of the prior art, to provide a sub-frame of a vehicle that can not only secure the collision performance of the vehicle by using a steel pipe, but also can secure cost reduction and durability reliability. There is a purpose.

Sub-frame of the vehicle according to the present invention for achieving this object is formed of a hollow first pipe, the front and left and right members are formed in a 'c' shape, the rear member is formed of a hollow second pipe, One end of the first pipe and the second pipe is welded and bowled to the first press frame, respectively, and the other end of the first pipe and the second pipe is welded and bowled to the second press frame, respectively, so that the first pipe And the second pipe is characterized in that the structure is combined.

1 is a perspective view of a conventional # -type subframe,

2 is a schematic perspective view of a # -type subframe according to the present invention;

3A is a cross-sectional view taken along line B-B 'of FIG. 2;

3B is a cross-sectional view taken along the line AA ′ of FIG. 2.

* Description of the symbols for the main parts of the drawings *

12: 1st pipe 14: 2nd pipe

16: The first subframe 18: The third pipe

20: fifth pipe 22, 24: hole

26: first mounting 28: second mounting

30: third mounting

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

FIG. 2 is a schematic perspective view of a # -type subframe according to the present invention, FIG. 3A is a sectional view taken along line AA ′ of FIG. 2, and FIG. 3B is a sectional view taken along line BB ′ of FIG. 2, and FIG. Only one side with respect to the center line is shown, the other side not shown is also the same structure as the portion shown.

In the # -type subframe according to the present invention, the front and left and right members are formed of a first pipe 12 formed in a 'c' shape, and the rear member is formed of a second pipe 14, and the first pipe ( 12 and one end of the second pipe 14 are welded and bowled to the first press frame 16, respectively, and the other ends of the first pipe 12 and the second pipe 14 are respectively the second press frame. The first pipe 12 and the second pipe 14 are coupled to each other by welding and bowling to (not shown).

The first and second pipes 12 and 14 are made of hollow pipes, and the first press frame 16 and the second press frame (not shown) have cross-sections of a 'c' shape. .

In addition, the hollow third pipe 18 and the fourth pipe (not shown) are welded and bowled to the left and right bent portions of the first pipe 12, respectively, and the first press frame 16 and the first The front end portions of the first pipe 12 and the second pipe 14 joined by two press frames (not shown) are welded and hollowed by the fifth pipe 20 and the sixth pipe (not shown), respectively. It is a bolted coupling structure.

Both ends of the third to sixth pipes 18 and 20 are crimped to be easily welded to the first and second pipes 12 and 14 and a bowling hole 22 is formed. It is welded and bowled to the first and second pipes 12, 14.

The first press frame 16, the second press frame (not shown), and the first pipe 12 have mounting holes 26, 28, and 28 having holes 24 formed therein for mounting the vehicle body. 30 has a plurality of welded structures, while the first pipe 12 has both ends welded and bowled to the first press frame 16 and the second press frame (not shown). It is.

Referring to the action according to the invention of the structure as described above in detail as follows.

The # -type subframe according to the present invention is formed of a hollow first pipe 12, a second pipe 14, a first press frame 16, and a second press frame (not shown). As a result, durability is improved, and collision performance is sufficiently secured at the front or offset collision.

In particular, the third to sixth pipes 20 and 22 are welded and bolted to the first pipe 12 and the second pipe 14 again to compensate for the collision performance during pole impact.

In this case, the first to sixth pipes 12, 14, 18, and 20 may be made of hollow pipes to maximize rigidity but minimize weight. In addition, since most of the structure is made of a hollow pipe as described above, it is possible to minimize the cost required for the mold production and processing, which is a structure that can significantly reduce the cost.

In particular, for the optimization of the collision performance, the parts to be supplemented through analysis and testing are easily formed by forming a pipe or by drilling holes to easily tune the collision performance.

As described above, according to the present invention, it is possible not only to secure a crash performance of a vehicle using a steel pipe, but also to secure cost reduction and durability.

Claims (2)

The front and left and right members are formed of hollow first pipes formed in a 'c' shape, and the rear members are formed of hollow second pipes, and ends of the first and second pipes are respectively welded to the first press frame. And a bolting coupling, and the other ends of the first pipe and the second pipe are welded and bowling coupled to the second press frame, respectively, so that the first pipe and the second pipe are coupled to each other. The method of claim 1, Hollow third pipes and fourth pipes are welded and bowled to the left and right bent portions of the first pipe, respectively, and the first and second pipes are joined by the first press frame and the second press frame. The front end portion of the subframe of the vehicle, characterized in that the hollow and fifth pipes and the sixth pipe is welded and bowling coupled respectively.