KR20130049508A - Structure of subframe for vehicle - Google Patents

Abstract

PURPOSE: A structure of a sub frame for a vehicle is provided to control vibration delivering booming noise generation by mounting a reinforcement pipe through a line or surface contact without installing a connection panel. CONSTITUTION: A structure of a sub frame(10) for a vehicle laminates and joins an upper panel(11) and a lower panel(12) with a predetermined gap therebetween. A first mounting hole of the upper panel and a second mounting hole of the lower panel are inserted by two or more reinforcement pipes(20) and are fixed through arc welding. A reinforcement panel(30) is attached between the reinforcement pipes for connecting two neighboring reinforcement pipes between the upper and lower panels.

Description

Structure of subframe for vehicle

The present invention relates to a structure of a vehicle subframe, and more particularly, to a structure of a vehicle subframe in which a reinforcement mounted between an upper panel and a lower panel is improved in order to improve the generation of an acceleration boom and vibration transmission.

Passenger vehicles are mostly lightweight and highly productive monocoque bodies instead of frame bodies. The monocoque body is a structure that eliminates a separate frame and is directly mounted with a power train (integrated with engine, transmission and differential gear).

Accordingly, the monocoque body is a frame function of the body itself, the suspension and the chassis components are mounted, respectively, but the sub-frame in the lower part of the vehicle in order to prevent the vibration of the powertrain is directly transmitted to the body and to distribute the impact in the event of a vehicle crash (subframe) is mounted.

The subframe is mounted under the vehicle body so that steering and suspension devices such as gearboxes, suspension struts and knuckles can be connected. On the other hand, the subframes are generally manufactured in the "#" shape and the "H" shape (also called "I" shape).

"#" Shaped subframes are generally applied when high torque engines are fitted and with four mounting elements (two roll rods, one engine mount and one transmission mount) in four locations (four point mount). Supporting the powertrain, the "H" shaped subframe is generally applied when a low torque engine is mounted and mounting elements (one roll rod and one engine mount and one in three places) Support the powertrain with the transmission mount.

Among these, the "H" shaped subframe has a shape as shown in FIG. The subframe is a structure in which two upper and lower panels are joined by being joined up and down along an edge, and a connection panel is mounted between the upper and lower panels so as to have a predetermined rigidity. In addition, mount pipes are inserted between the upper panel and the lower panel so that the steering gearbox seated on the upper panel is fixed, and the roll rod bracket is mounted to mount the roll rod.

The connection panel is a bent plate shape, the lower end is bent to form a weld (flange), and is welded and fixed to each of the upper panel and the lower panel so as to be in contact with the top and bottom.

On the other hand, when analyzing the path of the bouncing sound (particularly, the bouncing sound of 2000 to 2800 rpm band) transmitted to the vehicle body through the subframe, the input is made through the input points (A point, G point, roll rod bracket, etc.) of the subframe. The load or vibration was transmitted to the vehicle body through the subframe and the car body, and the noise was generated by excitation of the cowl panel and the dash panel.

As such a noise-induced countermeasure, conventionally, a connection panel as shown in FIG. 1 is mounted to improve vibration of a subframe, thereby improving acoustic sensitivity through rigidity increase.

However, there is a need to reduce the panel joint structure as much as possible due to the weight increase and the rust prevention problem due to the poor surface contact of the panels, there was a need to suppress the vibration transmission and swelling in other ways in place of the connection panel.

Accordingly, the present invention is a vehicle subframe structure that can suppress the transmission of vibration and the booming sound by mounting a reinforcing pipe mounted in line contact or point contact in place of the connection panel mounted in the surface contact in response to the above needs. The main purpose is to provide.

The present invention for achieving the above object, the upper panel and the lower panel is configured to be laminated coupled to the structure of the vehicle subframe in which the space is formed therebetween, the upper end passes through the first mounting hole formed in the upper panel At least two reinforcing pipes penetrating the second mounting hole formed in the lower panel is laid, the reinforcing pipes are fixed by arc welding in the first mounting hole and the second mounting hole, the beads generated by the arc welding Is formed along the inner circumference of the first mounting hole and the second mounting hole is characterized in that the reinforcement pipes are fixed to the upper panel and the lower panel via the bead.

In addition, two neighboring reinforcement pipes are connected to each other by a reinforcement panel disposed perpendicularly to the reinforcement pipes between the upper panel and the lower panel.

In addition, the reinforcement panel is formed with a groove along the longitudinal direction.

The present invention of the above configuration can not only improve the rigidity of the subframe, but also minimize the welding area between the reinforcing pipe and the panel, resulting in poor welding at the surface contact area (which may occur in the conventional structure) and / Or there is an effect that can suppress the generation of noise due to poor electrodeposition.

And, the reinforcement pipes are connected by the reinforcement panel has an effect that can suppress the vibration and torsion.

In addition, the reinforcement panel has a groove formed along the longitudinal direction has the effect of improving the rigidity of the reinforcement panel itself.

1 is a perspective view and a partially enlarged view showing a conventional subframe structure but showing a transparent upper panel so that an internal structure appears;
2 is a perspective view and a partially enlarged view showing a subframe structure of the present invention, but showing an internal structure;
3 is a cross-sectional view showing a state in which a reinforcing pipe mounted between an upper panel and a lower panel is connected by a reinforcing panel;
Figure 4 is a perspective view showing a state in which the upper end of the reinforcing pipe is projected over the upper panel.

Hereinafter, a subframe structure for a vehicle according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3, the subframe 10 of the present invention is configured by stacking the upper panel 11 and the lower panel 12 so that a predetermined space is formed therebetween. The upper panel 11 is perforated with a first mounting hole 11a, and the lower panel 12 is perforated with a second mounting hole 12a, wherein the first mounting hole 11a and the second mounting hole 12a are drilled. Are composed of pairs and each pair is formed at a position perpendicular to each other and perforated more than the number of reinforcing pipes 20 to be inserted.

At least two or more reinforcing pipes 20 are fitted between the upper panel 11 and the lower panel 12, the upper end of which is fitted into the first mounting hole 11a and the lower end of which is fitted into the second mounting hole 12a. do.

The reinforcement pipes 20 are attached to the rigid fragile portion of the subframe, and are fixed by arc welding in the first mounting hole 11a and the second mounting hole 12a.

More specifically, the reinforcement pipes 20 may have a bead generated by arc welding along the inner circumference of the first mounting hole 11a and the second mounting hole 12a as shown in FIG. 4. Welded to form. Thus, the reinforcement pipes 20 are fixed to the upper panel 11 and the lower panel 12 by means of beads.

In addition, the reinforcement panel 30 is attached to improve the rigidity between the reinforcement pipes 20 and to prevent shaking. The reinforcement panel 30 is mounted to connect two neighboring reinforcement pipes 20 between the upper panel 11 and the lower panel 12 as shown in FIG. 3. The groove 31 is formed along the longitudinal direction to prevent the reinforcement panel itself from improving rigidity and bending.

In order to solve the rust prevention problem due to poor welding or poor adhesion in the conventional structure, the subframe of the present invention has a reinforcement pipe having a reduced area of the welded area in comparison with the connection panel welded to the surface contact ( Since 20) is used, the rigidity may be reduced if the diameter and thickness of the reinforcing pipe 20 are too small. Accordingly, the present invention additionally provides a reinforcement pipe 30, and may improve the rigidity and tolerability of the subframe 10. In the preferred embodiment of the present invention, the reinforcement panel 30 is formed with a groove 31 to prevent twisting or bending, but may be configured to have a different form or thickness in place of the groove. The reinforcement panel 30 is also preferably joined by arc welding.

In the case of the surface contact reinforcing structure such as the conventional connection panel, the weld is bent at the end to be fastened by welding, but when the opposite surface is not adhered normally, rust prevention problems may occur, and moisture may penetrate between them and endurance corrosion may occur. there was. However, in the case of the reinforcing structure according to the present invention, since the contact area of the surface is minimized, it is possible to suppress the problems caused by the poor welding and / or poor adhesion as described above.

As described above, the embodiments disclosed in the present specification and drawings are only illustrative of specific examples in order to facilitate understanding of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: subframe
11: upper panel
12: lower panel
20: reinforcement pipe
30: reinforcement panel

Claims (3)

In the structure of a vehicle subframe in which the upper panel and the lower panel are laminated and constituted with a space therebetween,
At least two reinforcing pipes penetrating the first mounting hole formed in the upper panel and the second mounting hole formed in the lower panel are laid at least two,
The reinforcement pipes are fixed by welding in the first mounting hole and the second mounting hole,
The bead produced by the welding is formed along the inner circumference of the first mounting hole and the second mounting hole so that the reinforcement pipes are fixed to the upper panel and the lower panel via the bead.
2. The subframe structure for a vehicle according to claim 1, wherein two neighboring reinforcement pipes are connected to each other by a reinforcement panel disposed perpendicularly to the reinforcement pipes between the upper panel and the lower panel.
The subframe structure for a vehicle according to claim 2, wherein a groove is formed in the reinforcement panel in a longitudinal direction.

Images