KR20120045107A - Cross member for vehicles - Google Patents

Cross member for vehicles Download PDF

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Publication number
KR20120045107A
KR20120045107A KR1020100106435A KR20100106435A KR20120045107A KR 20120045107 A KR20120045107 A KR 20120045107A KR 1020100106435 A KR1020100106435 A KR 1020100106435A KR 20100106435 A KR20100106435 A KR 20100106435A KR 20120045107 A KR20120045107 A KR 20120045107A
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KR
South Korea
Prior art keywords
welding
plate
mounting hole
bracket
cross member
Prior art date
Application number
KR1020100106435A
Other languages
Korean (ko)
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KR101211420B1 (en
Inventor
정현진
최성현
Original Assignee
주식회사화신
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사화신 filed Critical 주식회사화신
Priority to KR1020100106435A priority Critical patent/KR101211420B1/en
Publication of KR20120045107A publication Critical patent/KR20120045107A/en
Application granted granted Critical
Publication of KR101211420B1 publication Critical patent/KR101211420B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/08—Understructures, i.e. chassis frame on which a vehicle body may be mounted built up with interlaced cross members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2410/00—Constructional features of vehicle sub-units
    • B60Y2410/12—Production or manufacturing of vehicle parts
    • B60Y2410/124—Welded parts

Abstract

The present invention relates to a vehicle cross member, and more particularly, to a vehicle cross member that can be prevented from being deformed or damaged by vibration generated during driving.
The present invention includes a first plate formed with a first mounting hole, a second plate coupled to the first plate, a second mounting hole formed to be opposed to the first mounting hole, and a bracket coupled to the second plate; Provided is a cross member for a vehicle including a plurality of welding parts provided at an overlapping portion between the second plate and the bracket.
In addition, the present invention comprises the steps of forming a first plate provided with a first mounting hole, forming a second plate provided with a connecting portion, welding the first plate and the second plate, and the first mounting Forming a bracket including a second mounting hole portion opposite to the hole portion and a coupling portion overlapping the coupling portion, welding the overlapping portion of the coupling portion and the coupling portion to process the first welding portion, and welding the overlapping portion of the coupling portion and the coupling portion It provides a vehicle cross-member manufacturing method comprising the step of processing the second weld.

Description

Car cross member {CROSS MEMBER FOR VEHICLES}

The present invention relates to a vehicle cross member, and more particularly, to a vehicle cross member that can be prevented from being deformed or damaged by vibration generated during driving.

In general, since the vehicle travels on a non-uniform road surface, the vehicle receives vibrations accompanied by noise, and members such as springs, shock absorbers, and stabilizers are installed to prevent the vehicle body from shaking.

These members serve to improve the comfort and stability of the vehicle while mainly performing the functions of damping force and garage control.

Of these suspensions, the rear suspension typically forms a multilink rear suspension that uses three to five links to determine the position of the axle.

One end of the lower arm on which the suspension is supported is fastened by a bush to a nut (or carrier) portion of the wheel, and the other end of the lower arm is bushed to a cross member (or subframe).

Here, members such as a lower arm and a cross member are called suspension members, and a trailing arm and a torsion beam are installed in the small car in place of the lower arm and the cross member.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

In general, vehicle crossmembers are formed by pressing a plurality of plates to form a complex shape, and then welds each plate to make one crossmember. Therefore, the welding part is deformed or damaged by vibration generated while driving a vehicle. There is a problem.

Therefore, there is a need for improvement.

It is an object of the present invention to provide a cross member for a vehicle which can prevent the welding part from being damaged by vibration generated while driving the vehicle.

In order to achieve the above object, the present invention provides a first plate in which a first mounting hole part is formed, a second plate coupled to the first plate, and a second mounting hole part facing the first mounting hole part. And a bracket coupled to the second plate, and a plurality of welding parts provided at an overlapping portion between the second plate and the bracket.

The welding part may include a first welding part provided between a connection part of the second plate and a coupling part of the bracket, and a second welding part provided at an overlapping part of the connection part and the coupling part and maintaining a gap with the first welding part. Characterized in that it comprises a.

The first welding portion may be seam welded to the connecting portion and the coupling portion.

The second welding part may be formed by forming a welding hole part in the coupling part and performing plug welding on the welding hole part and the connecting part.

In addition, the welding hole portion is formed in an elliptic shape, characterized in that disposed in the inclined direction of the connecting portion and the coupling portion.

In addition, the upper end of the first welding portion is characterized in that not arranged higher than the lower end of the second welding portion.

In addition, the second welding portion is characterized in that it is arranged at a point of less than 11% in the center direction of the second mounting hole portion from the upper end of the bracket.

In addition, the present invention comprises the steps of (a) forming a first plate provided with a first mounting hole, (b) forming a second plate provided with a connecting portion, (c) the first plate and the first Welding the two plates; (d) forming a bracket including a second mounting hole portion facing the first mounting hole portion and a coupling portion overlapping the connecting portion; and (e) overlapping the connecting portion and the coupling portion. Processing the first weld by welding the site, and (f) welding the overlapping portion of the connecting portion and the coupling portion to provide a method for manufacturing a cross-member for a vehicle, characterized in that it comprises a step.

In addition, the step (d) is characterized in that for forming the welding hole in the coupling portion.

In addition, the step (f) is characterized by performing a plug welding process for welding the welding hole portion and the connecting portion.

In addition, the step (e) is characterized in that the seam welding is performed along the overlapping portion of the connecting portion and the coupling portion.

In addition, the step (e) is characterized in that the seam welding is performed from the lower end of the coupling portion to the same height as the lower end of the welding hole.

Since the vehicle crossmember according to the present invention has a plurality of welding parts provided at a portion where stress is concentrated due to the vehicle vibration, there is an advantage of preventing the connection between the members from being broken by the vibration generated during the vehicle driving.

1 is a perspective view showing a vehicle cross member according to an embodiment of the present invention.
2 is an exploded perspective view showing a crossmember for a vehicle according to an embodiment of the present invention.
3 is a perspective view showing the bracket mounting structure of the vehicle cross member according to an embodiment of the present invention.
4 is a plan view showing a vehicle cross member according to an embodiment of the present invention.
5 is a partially enlarged view illustrating a bracket mounting structure of a vehicle cross member according to an exemplary embodiment of the present invention.
6 is a table showing stress analysis results according to the shape change of the first welding portion of the vehicle cross member according to an embodiment of the present invention.
7 is a table showing the results of durability analysis according to the shape change of the first welding portion of the vehicle cross member according to an embodiment of the present invention.
8 is a table illustrating stress analysis results according to a change in position of a second welding part of a vehicle cross member according to an exemplary embodiment of the present invention.
9 is a table showing the results of durability analysis according to the position change of the second welding portion of the vehicle cross member according to an embodiment of the present invention.
FIG. 10 is a table illustrating stress analysis results according to a shape change of a second welding part of a vehicle cross member according to an exemplary embodiment of the present invention.
11 is a flowchart illustrating a method for manufacturing a cross member for a vehicle according to an embodiment of the present invention.

Hereinafter, an embodiment of a vehicle cross member according to the present invention will be described with reference to the accompanying drawings.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom.

Therefore, definitions of these terms should be made based on the contents throughout this specification.

1 is a perspective view showing a crossmember for a vehicle according to an embodiment of the present invention, Figure 2 is an exploded perspective view showing a crossmember for a vehicle according to an embodiment of the present invention, Figure 3 is an embodiment of the present invention Bracket mounting structure of the vehicle cross member according to the perspective view.

4 is a plan view illustrating a crossmember for a vehicle according to an embodiment of the present invention, and FIG. 5 is a partially enlarged view illustrating a bracket mounting structure of the crossmember for a vehicle according to an embodiment of the present invention.

1 to 5, the vehicle cross member 100 according to the exemplary embodiment of the present invention is coupled to the first plate 10 and the first plate 10 on which the first mounting holes 12 are formed. A second plate 30 to be formed, a second mounting hole part 54 opposed to the first mounting hole part 12, and a bracket 50 coupled to the second plate 30, and the second plate 30. And a plurality of welds 72 and 74 provided at an overlapping portion between the bracket 50 and the bracket 50.

The vehicle cross member 100 is welded to form a space portion between the first plate 10 and the second plate 30 in order to improve rigidity against torsional vibration generated while driving the vehicle.

In addition, a lower arm (not shown) is inserted into and coupled to the opening so that both sides of the cross member 100 are opened.

Since the mounting holes 12 and 54 to which the bush is coupled are formed at the lower end of the cross member 100, the fastening member coupled to the suspension member is coupled to be movable.

The mounting holes 12 and 54 include a first mounting hole 12 formed in the first plate 10 and a second mounting hole 54 formed in the bracket 50, and the second mounting hole part ( The bracket 50 having the 54 formed thereon is welded to the second plate 30 so that the second mounting hole portion 54 is disposed to face the first mounting hole portion 12.

At this time, by processing a plurality of welds (72, 74) in the overlapping portion between the second plate 30 and the bracket 50 to improve the torsional rigidity at the connection between the second plate 30 and the bracket 50 do.

When the vibration generated while driving the vehicle is transmitted to the second plate 30 and the bracket 50, twist may be generated at the connection portion between the second plate 30 and the bracket 50. It is possible to prevent the breakage of the connecting portion.

The weld parts 72 and 74 are provided with a first weld part 72 provided between the connecting part 36 of the second plate 30 and the engaging part 56 of the bracket 50, and the connecting part 36 and the engaging part 56. And a second welding portion 74 provided at an overlapping portion of the) and spaced apart from the first welding portion 72.

The second plate 30 is formed in a shape similar to an inverted trapezoid in a planar shape, and is bent to form a step at both ends forming an inclined surface to form a connection portion 36.

Bracket 50 has a flat shape is formed in a shape similar to a dry hair and the inclined surface formed on one side forms a coupling portion 56 overlapping the connection portion 36.

A second mounting hole 54 is formed at a corner of the lower portion of the bracket 50 opposite to the first mounting hole 12 of the first plate 10.

When the welding process is performed by overlapping the connecting portion 36 and the coupling portion 56, the first welding portion 72 is formed in an inclined curve shape.

When torsional vibration is applied to the second plate 30 and the bracket 50, breakage may occur in the first welding part 72. In particular, stress tends to be concentrated on the upper end of the first welding part 72.

Therefore, when the second welding portion 74 is processed while keeping the gap from the upper end of the first welding portion 72, the stress concentrated on the upper end of the first welding portion 72 is dispersed.

At this time, as shown in FIG. 5, the second welding part 74 is disposed to maintain a distance from an upper end of the first welding part 72 in a lateral direction.

When torsional vibration in which the height of the upper end of the second plate 30 and the lower end of the bracket 50 alternately rise or fall occurs, breakage may occur at the upper end of the first welding part 72. It is possible to suppress that the upper end 52 of the bracket 50 and the connecting portion 36 are spaced apart by the second welding portion 74 which is spaced laterally from the upper end of 72.

The first welding portion 72 is formed by performing seam welding on the connecting portion 36 and the engaging portion 56.

The connecting portion 36 is bent so that both ends of the second plate 30 are stepped downward.

Therefore, the end of the coupling part 56 is brought into close contact with the step so that the connection part 36 and the coupling part 56 overlap each other, and then seam welding is performed between the end of the coupling part 56 and the connection part 36. A curved first welding portion 72 is formed along the step formed.

Normal seam welding performs seam welding from the bottom of the coupling portion 56 to the top of the coupling portion 56, but the present embodiment combines the coupling portion 56 to disperse the stress concentrated at the top of the first welding portion 72. ) Do not weld a part of the top.

As mentioned above, after processing the 1st welding part 72, the 2nd welding part 74 is processed so that the space | interval may be maintained laterally from the upper end of the 1st welding part 72. As shown in FIG.

The second welding portion 74 is formed by forming the welding hole portion 58 in the coupling portion 56 and performing plug welding on the welding hole portion 58 and the connecting portion 36.

Since the second welding portion 74 formed by the plug welding has an elliptic shape, it can be seen that the rigidity against torsion is higher than that of the first welding portion 72 having a curved shape near the straight line.

The welding hole portion 58 is formed in an ellipse shape and is disposed to be inclined in the inclined direction of the connecting portion 36 and the coupling portion 56.

Therefore, when breakage is generated in which the connecting portion 36 and the coupling portion 56 are spaced apart, and when the breakage occurs stepwise from the upper end of the coupling portion 56 to the lower direction, It can be seen that the time required for complete breakage is longer as compared to the arrangement of the two welding portions 74 in other directions.

FIG. 6 is a table illustrating stress analysis results according to a change in shape of a first welded part of a vehicle cross member according to an exemplary embodiment of the present disclosure, and FIG. 7 is a shape of a first welded part of a vehicle cross member according to an embodiment of the present invention. The table shows the results of durability analysis according to the change.

In addition, Figure 8 is a table showing the stress analysis results according to the position change of the second welding portion of the vehicle cross member according to an embodiment of the present invention, Figure 9 is a second table of the vehicle cross member according to an embodiment of the present invention 10 is a table showing the results of durability analysis according to the position change of the weld, and FIG. 10 is a table showing the results of stress analysis according to the shape change of the second welded part of the vehicle cross member according to the exemplary embodiment of the present invention.

1 to 10, the upper end of the first welding part 72 of the present exemplary embodiment is disposed not higher than the lower end of the second welding part 74.

As shown in FIGS. 6 and 7, the stress analysis and the endurance analysis were performed while varying the length of the first welding portion 72. As a result, the upper end of the first welding portion 72 has the same height as the lower end of the second welding portion 74. It can be seen that the stress generated on the upper end of the first welding portion 72 and the longest service life when it is disposed in the.

It can be seen that the stress generated on the upper end of the first welding portion 72 becomes higher when the upper end of the first welding portion 72 is disposed higher or lower than the lower end of the second welding portion 74.

In addition, when the upper end of the first welding portion 72 is disposed at the same height as the upper end of the second welding portion 74, it can be seen that the stress generated on the upper end of the first welding portion 72 is increased rapidly.

Therefore, when the upper end of the first welding portion 72 is disposed at the same level or lower than the lower end of the second welding portion 74, it can be seen that the stress generated on the upper end of the first welding portion 72 is lowered.

Preferably, the upper end of the first welding part 72 and the lower end of the second welding part 74 may be disposed at the same height.

As described above, when the upper end of the first welding part 72 and the lower end of the second welding part 74 are disposed at the same height, it can be seen that the service life is also longest.

The second welding portion 74 is disposed at a point of 11% or less in the center direction of the second mounting hole portion 54 from the upper end 52 of the bracket 50.

As shown in FIG. 8 and FIG. 9, stress analysis and durability analysis were performed while varying the position of the second welding portion 74. FIG.

Assuming that the upper end 52 of the bracket 50 is 0% and the center 54a of the second mounting hole portion 54 is 100%, the second welding portion 74 is 0 in the position (a) of 0% to 100%. It can be seen that the stress generated at the upper end of the first welding portion 72 is the smallest and the longest service life when disposed in the position (b) of% to 11%.

Here, 0% means that the upper end of the second welding portion 74 is disposed at the same height as the upper end 52 of the bracket 50.

In addition, as shown in FIG. 10, the second welded portion 74 may have the smallest stress generated at the upper end of the first welded portion 72 when welding the entire elliptical weld hole 58.

When the stress analysis and the endurance analysis as described above are combined, the second welding portion 74 is formed by welding the entire welding hole portion 58 formed in an ellipse shape, and the second mounting portion is mounted from the upper end 52 of the bracket 50. Most preferably, the lower portion of the second weld portion 74 is disposed at the same height as the upper end of the first weld portion 72.

Looking at the vehicle cross-member manufacturing method according to an embodiment of the present invention configured as described above are as follows.

11 is a flowchart illustrating a method for manufacturing a cross member for a vehicle according to an embodiment of the present invention.

1 to 5 and 11, in the method for manufacturing a cross member for a vehicle according to an exemplary embodiment of the present invention, forming the first plate 10 having the first mounting hole part 12 (S10). And, forming the second plate 30 having a connecting portion 36 (S20), welding the first plate 10 and the second plate 30 (S30), and the first mounting hole Forming a bracket 50 having a second mounting hole portion 54 and a coupling portion 56 overlapping the connecting portion 36 facing the surface 12 (S40), and the connecting portion 36 and the coupling portion ( Welding the overlapping portion of 56 to process the first welding portion 72 (S50), and welding the overlapping portion of the connecting portion 36 and the coupling portion 56 to process the second welding portion 74 ( S60).

A first plate 10 having a first mounting hole 12 formed therein, a second plate 30 having a connecting portion 36 formed at both ends thereof, and a bracket having a second mounting hole 54 formed therein. 50).

The first plate 10 and the second plate 30 are welded and the bracket 50 is welded to the second plate 30 to form a cross member 100.

At this time, after overlapping the coupling portion 56 formed on one side of the bracket 50 to the connection portion 36 of the second plate 30, the seam toward the upper end of the coupling portion 56 from the lower end of the coupling portion 56 The first welding portion 72 is formed by welding.

The second welding portion 74 is formed by performing a separate welding process so as to maintain a gap in the lateral direction from the upper end of the first welding portion 72.

In the step S20 of forming the second plate 30, the welding hole part 58 is formed in the coupling part 56 when the pressing process is performed. Thus, the welding hole part is performed in the welding process for processing the second welding part 74. No separate process for forming 58 is required.

The step S60 of processing the second welding part 74 is performed by performing a plug welding process of welding the welding hole part 58 and the connection part 36.

Therefore, the second welding portion 74 in the shape of an ellipse is formed while maintaining a gap on one side of the upper end of the first welding portion 72.

The step S50 of processing the first welding part 72 is performed by performing seam welding along an overlapping portion of the connection part 36 and the coupling part 56.

Therefore, a curved first weld portion 72 having the same shape as the coupling portion is formed in the direction of the bracket 50 from the lower end of the coupling portion 56.

In addition, the step S50 of processing the first welding part 72 is performed by performing seam welding from the lower end of the coupling part 56 to the same height as the lower end of the welding hole part 58.

Accordingly, the second welding portion 74 is formed by welding the entire welding hole portion 58 formed in an elliptic shape, and is 11% from the upper end 52 of the bracket 50 in the direction of the center 54a of the second mounting hole portion 54. It is disposed at the following points, the lower end of the second welding portion 74 to form a second welding portion 74 and the first welding portion 72 is disposed at the same height as the upper end of the first welding portion (72).

As a result, it is possible to provide a vehicle cross member and a method of manufacturing the same, which can prevent the welding part from being damaged by vibration generated while driving the vehicle.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible to those skilled in the art. Will understand.

In addition, although the vehicle cross member has been described as an example, this is merely exemplary, and the cross member of the present invention may be used in a product other than the vehicle.

Therefore, the true technical protection scope of the present invention will be defined by the claims below.

10: first plate 12: first mounting hole
30: second plate 36: connection portion
50: bracket 52: top
54: second mounting hole 54a: center
56: coupling portion 58: welding hole portion
72: first welded portion 74: second welded portion
100: cross member

Claims (12)

A first plate having a first mounting hole formed therein;
A second plate coupled to the first plate;
A bracket having a second mounting hole formed to face the first mounting hole and coupled to the second plate;
And a plurality of welding parts provided at an overlapping portion between the second plate and the bracket.
The method of claim 1, wherein the welding portion,
A first welding part provided between the connection part of the second plate and the coupling part of the bracket; And
And a second welding part provided at an overlapping portion of the connection part and the coupling part and maintaining a distance from the first welding part.
The method of claim 2,
And the first welding portion is seam welded to the connecting portion and the coupling portion. The method of claim 3,
And the second welding part is formed by forming a welding hole part in the coupling part and performing plug welding on the welding hole part and the connecting part.
The method of claim 4, wherein
The welding hole portion is formed in an elliptic shape and the cross member for a vehicle, characterized in that disposed inclined in the inclined direction of the connecting portion and the coupling portion.
The method according to any one of claims 1 to 5,
The upper end of the first welding part is not higher than the lower end of the second welding part for vehicles, characterized in that disposed.
The method of claim 6,
And the second welding part is disposed at a point of 11% or less in the center direction of the second mounting hole part from an upper end of the bracket. (a) forming a first plate having a first mounting hole;
(b) forming a second plate having a connection portion;
(c) welding the first plate and the second plate;
(d) forming a bracket including a second mounting hole portion facing the first mounting hole portion and a coupling portion overlapping the connecting portion;
(e) machining the first welding part by welding the overlapping part of the connection part and the coupling part; And
and (f) welding the overlapping portion of the connection portion and the coupling portion to process a second welding portion.
The method of claim 8,
The step (d) is a cross member manufacturing method for a vehicle, characterized in that for forming a welding hole in the coupling portion.
10. The method of claim 9,
The step (f) is a cross-member manufacturing method for a vehicle, characterized in that by performing a plug welding process for welding the welding hole portion and the connecting portion. 10. The method of claim 9,
The step (e) is a vehicle cross member, characterized in that for performing seam welding along the overlapping portion of the connecting portion and the coupling portion.
The method of claim 11,
The step (e) is a vehicle cross member, characterized in that for performing seam welding from the lower end of the coupling portion to the same height as the lower end of the welding hole.
KR1020100106435A 2010-10-29 2010-10-29 Cross member for vehicles KR101211420B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100106435A KR101211420B1 (en) 2010-10-29 2010-10-29 Cross member for vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100106435A KR101211420B1 (en) 2010-10-29 2010-10-29 Cross member for vehicles

Publications (2)

Publication Number Publication Date
KR20120045107A true KR20120045107A (en) 2012-05-09
KR101211420B1 KR101211420B1 (en) 2012-12-12

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Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3791295B2 (en) * 2000-04-12 2006-06-28 スズキ株式会社 Suspension frame structure
JP4114055B2 (en) * 2002-12-26 2008-07-09 三菱自動車工業株式会社 Plate member reinforcement structure

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