KR102169354B1 - Structure of cross section of roof rail - Google Patents

Abstract

The present invention relates to a cross-sectional structure of a roof rail to which a seat belt of a vehicle is fastened, and more particularly, to an upper roof rail and a lower roof rail and the upper roof rail that are mutually coupled at the front and rear ends so as to have a sealed space therein. It includes a reinforce rail that is mounted between the lower roof rails to supplement the rigidity of the roof rail, wherein the reinforce rail is a cross section in the front and rear direction of the vehicle in the shape of an'X' in the space between the upper roof rail and the lower roof rail. It is characterized in that it is formed to have, while maintaining the overall weight and height of the conventional roof rail as it is, the amount of deformation of the roof rail relates to an improved roof rail cross-sectional structure.

Description

Roof rail cross-section structure {STRUCTURE OF CROSS SECTION OF ROOF RAIL}

The present invention relates to a cross-sectional structure of a roof rail to which a seat belt of a vehicle is fastened, and more particularly, a reinforce rail having a cross section in the front and rear direction of the vehicle in the shape of an'X' in the space between the upper roof rail and the lower roof rail. It relates to a roof rail cross-sectional structure in which the deformation amount of the roof rail is improved by mounting.

The seat belt of a vehicle refers to a device that prevents or minimizes injuries caused by a vehicle crash, sudden braking, or vibration by the occupant being thrown out of the seat or hitting a protrusion in the vehicle.

In general, a seat belt is a webbing that constrains the occupant's body and has an energizer absorption capacity, a buckle that is coupled to the end of the webbing and helps the occupant to easily insert and remove the webbing, and the webbing of the webbing. The length can be adjusted according to the occupant's sitting posture or physique, and when not in use, it is composed of a retractor with a webbing storage as a wooden head.

Such a seat belt is a two-point type that restrains the lower body of the occupant by fixing both ends of the webbing to two places on the vehicle body, a three-point type that restrains the waist and shoulders of the occupant, and the end of the webbing. It is fixed at 4 or more places of this vehicle body and is classified into 4 or more points used in racing vehicles.

The seat belt installed in the center of the rear seat of the vehicle used a two-point mounting structure to protect the lower body of the occupant, but in recent years, a three-point mounting structure is used to protect not only the occupant's waist but also the chest. Are doing.

1 is a schematic diagram showing a coupling structure between a seat belt and a roof rail of a general vehicle.

As shown in FIG. 1, in a general three-point seat belt, an upper anchor 4 is mounted on the lower side of a roof rail 1 disposed on an upper portion of a rear seat, and a webbing (not shown) drawn out from a retractor (not shown) 5) has a structure that is fixed to the buckle fixing portion (not shown) after passing through the upper anchor (4).

However, in this case, the roof rail 1 should provide sufficient rigidity at the part where the upper anchor 4 is mounted (i.e., the anchor point) so that it can safely support the occupants in case of sudden impact. The rail (1) is severely deformed, so the seat belt cannot function properly and cannot pass other anchor strength tests.

That is, the upper anchors of conventional seat belts installed on the left and right of the driver's seat, passenger seat, and rear seat are mounted on the center pillar or rear pillar, so that the impact force transmitted from the seat belt can be easily distributed to the adjacent door or other vehicle bodies, but the seat belt installed in the center of the rear seat The upper anchor (4) is coupled to the roof rail (1), and there is no member that can distribute the impact force to the adjacent position, and the seat belt force acts on a good position to cause the roof rail (1) to sag. It is bound to exceed this limited amount of deformation.

FIG. 2 is a cross-sectional view showing a cross-sectional view of a conventional roof rail in the front-rear direction of a vehicle, and FIG. 3 is a schematic diagram illustrating a deformation amount of a roof rail to which the roof rail cross-sectional structure shown in FIG. 2 is applied.

In order to improve the deformation amount of the roof rail 1 as described above, in the related art, a reinforce rail 3 installed in the space 2 between the upper roof rail 1a and the lower roof rail 1b as shown in FIG. ) The cross section in the front and rear direction of the vehicle is formed in a'W' shape to complement the rigidity of the roof rail (1).

However, as shown in FIG. 3, the improved roof rail 1 can also improve the amount of local excessive deformation at the anchor point to about 49 mm (previously, about 79 mm), but the roof rail 1 as a whole is sagging. Due to the occurrence of the phenomenon, there is a problem that the maximum amount of deformation of the sagging portion reaches about 67.5mm.

In addition, in order to improve the deflection of the roof rail, the overall height of the roof rail including the reinforcement rail can be increased to increase the bending stiffness of the roof rail, but this method is also used for conventional parts (for example, heat duck). There is a problem that it is impossible due to the formation of a gap between the and the like.

Accordingly, there is an urgent need for a method capable of preventing collapse of the roof rail while maintaining the overall height of the conventional roof rail and improving the safety of the seat belt wearer.

The present invention has been conceived to solve the problems of the prior art, and an object of the present invention is to provide a roof rail cross-sectional structure in which the overall weight and height of the conventional roof rail are maintained and the amount of deformation of the roof rail is improved.

In addition, another object of the present invention is to provide a cross-sectional structure of a roof rail that ensures safety of occupants by preventing the roof rail from collapsing in the event of a vehicle collision or sudden brake by preventing the overall sagging of the roof rail.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those of ordinary skill in the art from the description of the present invention. .

The configuration of the present invention for achieving the above object is, in the cross-sectional structure of a roof rail installed in a vehicle width direction on a roof of a vehicle, the upper roof rail and the lower part are mutually coupled at the front and rear ends so as to have a space sealed therein. Roof rail; And a reinforce rail mounted between the upper roof rail and the lower roof rail to supplement rigidity of the roof rail. Including, wherein the reinforcement rail is characterized in that it is formed to have a cross section in the front and rear direction of the vehicle in the shape of an'X' in the space portion between the upper roof rail and the lower roof rail.

In addition, in the cross-sectional structure of a roof rail according to an embodiment of the present invention, the reinforce rail may include: a first reinforce rail inclined diagonally from one side of the space portion toward a lower portion, and the end thereof is coupled to an upper surface of the lower roof rail; And a second reinforcement rail inclined diagonally from the other side of the space portion toward the lower side and having an end thereof coupled to the upper surface of the first reinforcement rail. And a first reinforcement reinforcement portion disposed diagonally between a lower surface of the first reinforcement rail and an upper surface of the lower roof rail; It further includes, the first reinforcement rail, the second reinforcement rail, and the first reinforcement reinforcement portion is preferably disposed to form an'X'-shaped cross-section in the front-rear direction of the vehicle in the space portion.

In addition, in the cross-sectional structure of the roof rail according to an embodiment of the present invention, the reinforcement rail is formed to form a cross section in the form of a "∨" shape by bending the central part of the reinforcement rail downward in the space part, and is disposed in the space part, A second reinforcement reinforcement portion having a central portion bent upward to form a cross section in a "∧" shape, both ends of which are coupled to an upper surface of the lower roof rail and a central portion of which is coupled to a central lower surface of the reinforced rail; It further includes, and the reinforcement rail and the second reinforcement reinforcement portion is preferably arranged to form an'X'-shaped cross-section in the front-rear direction of the vehicle in the space portion.

In addition, in the cross-sectional structure of a roof rail according to an exemplary embodiment of the present invention, it is preferable that cross-sections of the upper roof rail, the lower roof rail, and the reinforcement rail in the vehicle front-rear direction are formed in the same shape along the vehicle width direction.

Further, in the cross-sectional structure of the roof rail according to an embodiment of the present invention, the joint portion of the first reinforcement rail and the second reinforcement rail, and the joint portion of the first reinforcement rail and the first reinforcement reinforcement portion may include: It is preferably disposed on a center line passing through the directional center.

The present invention having the configuration as described above, by forming the reinforce rail in the space between the upper roof rail and the lower roof rail to have a cross section in the front and rear direction of the vehicle in the shape of'X', the overall weight and height of the conventional roof rail It has the effect of reducing the deformation amount of the roof rail while maintaining it as it is.

Specifically, the roof rail having a cross-sectional structure according to the present invention has the effect of reducing the amount of deformation of about 9 mm (49mm-40.1mm) at the anchor point and the effect of reducing the amount of deformation of 38mm (67.5mm-29mm) at the deflection point compared to the conventional roof rail. And, accordingly, the maximum roof rail deformation amount is reduced by about 27 mm (67.5 mm-40.1 mm).

In addition, the present invention has the effect of preventing the overall sagging of the roof rail, thereby preventing the collapse of the roof rail in the event of a vehicle collision or sudden brake, thereby ensuring the safety of the occupant and allowing the seat belt to perform its function.

1 is a schematic diagram showing a joint structure of a seat belt and a roof rail of a general vehicle.
2 is a cross-sectional view showing a cross-section of a conventional roof rail in the front and rear direction of the vehicle.
3 is an exemplary view schematically showing a deformation amount of a roof rail to which the roof rail cross-sectional structure shown in FIG. 2 is applied.
4 is a cross-sectional view showing a cross-sectional view of a roof rail in a vehicle front-rear direction according to an embodiment of the present invention.
5 is an exemplary view schematically showing a deformation amount of a roof rail to which the roof rail cross-sectional structure shown in FIG. 4 is applied.
6 is a cross-sectional view showing a cross-sectional view of a roof rail in a vehicle front-rear direction according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In addition, terms or words used in the present specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor appropriately defines the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

4 is a cross-sectional view showing a cross-section of a roof rail 10 in the front and rear direction of a vehicle according to an embodiment of the present invention.

The cross-sectional structure of the roof rail 10 according to an embodiment of the present invention includes an upper roof rail 12 and a lower roof rail 14 that are mutually coupled at the front end and the rear end so as to have a sealed space 16 therein, and the Includes a reinforce rail 20 that is mounted between the upper roof rail 12 and the lower roof rail 14 to supplement the rigidity of the roof rail 10, wherein the reinforce rail 20 includes an upper roof rail It is characterized in that it is formed to have a cross section in the front and rear direction of the vehicle in the shape of an'X' in the space 16 between the 12 and the lower roof rail 14.

The roof rail 10 is installed on the roof of the vehicle in the vehicle width direction to form a vehicle body, and serves to support the roof panel under the roof panel (not shown) and impart rigidity to the roof.

Specifically, the roof rail 10 is divided into an upper roof rail 12 and a lower roof rail 14, and the front end 12a of the upper roof rail, the front end 14a of the lower roof rail, and the rear end of the upper roof rail ( 12b) and the rear end 14b of the lower roof rail are bonded by welding or the like with the reinforcement rail 20 interposed therebetween.

The upper roof rail 12 has a'∩' shape cross section with a central portion bent upward, and the lower roof rail 14 has a'∪' shape cross section with a central portion bent downward, A sealed space 16 is formed between the upper roof rail 12 and the lower roof rail 14.

A reinforce rail 20 is mounted between the upper roof rail 12 and the lower roof rail 14 to supplement the rigidity of the roof rail 10, and the reinforce rail 20 is located in the space 16 It is formed to have an'X'-shaped cross section in the front and rear direction of the vehicle.

As shown in FIG. 4, the reinforcement rail 20 is inclined diagonally downward from one side of the space unit 16 (right side in the illustrated embodiment) so that the end of the lower roof rail 14 The first reinforcement rail 22 coupled with the upper surface and the other side (left in the illustrated embodiment) of the space unit 16 are diagonally inclined toward the lower side to be combined with the upper surface of the first reinforcement rail 22 It includes a second reinforcement rail (24).

In addition, the first reinforcement reinforcement part 30 is disposed diagonally between the lower surface of the first reinforcement rail 22 and the upper surface of the lower roof rail 14, so that the first reinforcement rail 22 and the lower It connects between the roof rails 14, and the first reinforcement rail 22, the second reinforcement rail 24, and the first reinforcement reinforcement part 30 have a'X' shape in the space part 16 It is arranged to form a cross section in the front and rear direction of the vehicle.

The end (22a) of the first reinforcement rail extends parallel to the upper surface of the lower roof rail (14) so that surface contact with the lower roof rail (14), and the end (24a) of the second reinforcement rail The first reinforcement rail 22 extends in parallel with the central upper surface of the first reinforcement rail 22 so as to be in surface contact with the first reinforcement rail 22.

In addition, one end (left end, 32 in the illustrated embodiment) of the first reinforcement reinforcement part is parallel to the central lower surface of the first reinforcement rail 22 so as to be in surface contact with the first reinforcement rail 22. It extends, and the other end of the first reinforcement reinforcement part (the right end 34 in the illustrated embodiment) extends parallel to the upper surface of the lower roof rail 14 so as to be in surface contact with the lower roof rail 14.

That is, the junction between the first reinforcement rail 22 and the lower roof rail 14, the junction between the second reinforcement rail 24 and the first reinforcement rail 22, and the first reinforcement reinforcement part 30 The joint of the first reinforcement rail 22 and the joint of the first reinforcement reinforcement 30 and the lower roof rail 14 are all in surface contact, so that the rigidity of the roof rail 10 at the joint is reduced as much as possible. Are preventing.

On the other hand, the inventors of the present invention performed analysis verification assuming that the cross section of the roof rail 10 in the front and rear direction of the vehicle was kept constant and the thickness of the lower roof rail 14 was increased (about twice or more). In terms of the effect of improving the amount of deformation of the roof rail 10, the case where the cross section of the roof rail 10 is kept constant and the thickness of the lower roof rail 14 is similarly improved by about 30%. On the other hand, it was confirmed that the case where the cross-section of the roof rail 10 is kept constant in terms of the overall deformation state has a much better deformation state.

Therefore, the roof rail 10 including the upper roof rail 12, the lower roof rail 14, the first reinforcement rail 22, the second reinforcement rail 24, and the first reinforcement reinforcement part 30 ) It is preferable that the cross-section in the front and rear direction of the vehicle is formed in the same shape so that it can have a constant height along the vehicle width direction.

The conventional roof rail 1 was generally formed to have a cross-section of various shapes depending on the position in the vehicle width direction, but the roof rail 10 according to the present invention maintains a constant shape of the cross-section than that of the conventional roof rail 1 It is trying to maintain a better state of deformation.

As shown in FIG. 4, the junction of the second reinforcement rail 24 and the first reinforcement rail 22, that is, the end 24a of the second reinforcement rail and the first reinforcement reinforcement part 30 ) And the joint portion of the first reinforcement rail 22, that is, one end of the first reinforcement reinforcement portion (the left end 32 in the illustrated embodiment) is a center line A passing through the center of the space portion 16 in the front and rear direction of the vehicle It is preferably placed on top.

This means that when an external force is applied, the resistance force, that is, the stress generated inside it becomes 0 at the neutral axis, so reinforcement at the neutral axis is required, and therefore, on the center line A passing through the center of the space 16 This is to concentrate multiple materials.

5 is an exemplary view schematically showing the amount of deformation of the roof rail 10 to which the roof rail cross-sectional structure shown in FIG. 4 is applied.

As shown in Fig. 5, the roof rail 10 to which the roof rail cross-sectional structure according to an embodiment of the present invention is applied is improved to about 40.1 mm from the amount of deformation of the anchor point of the conventional roof rail 1, which was about 49 mm. There is an effect of improving the local deformation amount of the anchor point of about 18%, and by improving the maximum deformation amount of the deflection part of the conventional roof rail 1 to about 67.5mm to 29mm, there is an effect of improving the maximum deformation amount of the deflection part of about 57%.

That is, in the roof rail 10 to which the roof rail cross-sectional structure according to an embodiment of the present invention is applied, the deformation amount of the anchor point is maintained at a level substantially similar to that of the conventional one, but the maximum deformation amount of the deflection part is significantly improved compared to the conventional one. have.

6 is a cross-sectional view showing a cross-section of a roof rail 10 in the front and rear direction of a vehicle according to another embodiment of the present invention.

As shown in Fig. 6, the reinforcement rail 20 is formed to form a "∨"-shaped cross section by bending the central part of the reinforcement rail 20 downward in the space part 16, and the reinforcement rail 20 and the lower loop Between the upper surfaces of the rails 14, a second reinforcement reinforcement portion 40 formed so that the central portion thereof is curved upward to form a "∧"-shaped cross section is coupled.

The central portion 42 of the second reinforcement reinforcement portion is coupled to the central lower surface of the reinforcement rail 20, and both ends of the second reinforcement reinforcement portion 40 are coupled to the upper surface of the lower roof rail 14 do.

Similar to the roof rail 10 according to an embodiment of the present invention described above, the central portion of the reinforcement rail 20 and the central portion 42 of the second reinforcement reinforcement portion extend parallel to each other, and the second line It is preferable that both ends of the force reinforcing portion 40 extend parallel to the upper surface of the lower roof rail 14.

In addition, the junction between the reinforcement rail 20 and the second reinforcement reinforcement portion 40, that is, the central portion of the reinforcement rail 20 is on the center line A passing through the center of the space 16 in the front and rear direction of the vehicle. It is preferable to be placed in.

The cross-sectional structure of the roof rail 10 according to another embodiment of the present invention is compared with the cross-sectional structure of the roof rail 10 according to an embodiment of the present invention, and the number of parts is relatively reduced by one, and the reinforce rail 20 ) And the second reinforcement reinforcement portion 40 has the advantage that the molding becomes easy.

In the technical field to which the present invention pertains, the present invention described above is not limited by the above-described embodiments and the accompanying drawings, and that various substitutions, modifications and changes can be made within the scope of the technical spirit of the present invention. It will be obvious to those of ordinary skill.

10: roof rail
12: upper roof rail
12a: The tip of the upper roof rail
12b: rear end of upper roof rail
14: lower roof rail
14a: tip of lower roof rail
14b: rear end of lower roof rail
16: space part
A: Center line of space
20: reinforce rail
22: first reinforcement rail
22a: end of the first reinforcement rail
24: second reinforcement rail
24a: end of the second reinforcement rail
30: first reinforcement reinforcement part
32: one end of the first reinforcement reinforcement part
34: the other end of the first reinforcement reinforcement part
40: 2nd reinforcement reinforcement part
42: central part of the second reinforcement reinforcement part

Claims (5)

In the cross-sectional structure of a roof rail including a reinforced rail that is installed on the roof of a vehicle in the vehicle width direction and supplements the rigidity of the roof rail,
An upper roof rail 12 and a lower roof rail 14 that are mutually coupled at the front and rear ends to have a sealed space 16 therein; And
The reinforcement rail 20 is; A first reinforcement rail (22) inclined diagonally from one side of the space (16) toward a lower end thereof to be coupled to an upper surface of the lower roof rail (10); And
A second reinforcement rail (24) inclined diagonally from the other side of the space (16) toward a lower end thereof and coupled to the upper surface of the first reinforcement rail (22); Including,
A first reinforcement reinforcement part 30 disposed diagonally between a lower surface of the first reinforcement rail 20 and an upper surface of the lower roof rail 14; It further includes,
The first reinforcement rail 22, the second reinforcement rail 24, and the first reinforcement reinforcement part 30 are arranged to form an'X'-shaped cross-section in the front and rear direction of the vehicle in the space part 16. Roof rail cross-sectional structure characterized by.
delete The method of claim 1,
The reinforcement rail 22 is curved downward in the space part 16 to "

It is formed to form a ruler-shaped cross section,
It is disposed in the space part 16, and its central part is curved upwardly "

A second reinforcement reinforcement part 40 formed to form a square cross section, both ends of which are combined with the upper surface of the lower roof rail 14 and the central part of which is combined with the central lower surface of the reinforcement rail 22; It further includes,
The reinforcement rail 22 and the second reinforcement reinforcement part 40 are arranged to form an'X'-shaped cross-section in the front-rear direction of the vehicle in the space part 16.
The method according to any one of claims 1 or 3,
The cross-section of the upper roof rail 12, the lower roof rail 14, and the reinforcement rail 20 in the vehicle front-rear direction is formed in the same shape along the vehicle width direction.

The method of claim 1,
The joint portion between the first reinforcement rail 22 and the second reinforcement rail 24 and the joint portion between the first reinforcement rail 22 and the first reinforcement reinforcement portion 30, the space portion 16 Roof rail cross-sectional structure, characterized in that disposed on the center line passing through the center of the vehicle front-rear direction.

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