KR100519053B1 - Impact beam for passenger car door - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide an impact beam for an automobile door that is mounted on a door of an automobile to improve shock energy absorption capability.

According to the present invention, in the impact beam mounted on the door of the vehicle to absorb shock, two beams at both ends are coupled to both ends of one center beam, and the beams at both ends to improve the impact energy absorption characteristics There is provided an impact beam for an automobile door, characterized in that the connection of the central beam is bolted or riveted.

Description

Impact beam for passenger car door

The present invention relates to an impact beam mounted on a door of an automobile to absorb shock, and more particularly, to a composite material or a hybrid impact beam for the purpose of improving impact energy absorption. The connection method of the connection part can be utilized in a composite material structure that supports static or impact loads, and can be applied to a structure for improving static strength and shock absorption characteristics.

In general, an impact beam is mounted between the inner panel and the outer panel of the car door to absorb shocks in a vehicle crash. The conventional impact beam is made of tubular or other structure using high-strength steel, which is heavy and impacts at low temperatures. It has a problem of poor energy absorption characteristics.

To compensate for this, impact beams using fiber-reinforced composites with superior specific strength (strength / density) and impact energy absorption properties have been devised.

The conventional composite impact beam improves the impact energy absorption characteristics by using bolts or rivets to connect the bracket and the beam welded to the door panel, but a structure for more efficient impact energy absorption has been required in the related art.

The present invention has been made to solve the above problems of the prior art, an object of the present invention is to provide an impact beam of an automobile door that improves the impact energy absorption capacity by improving the structure of the impact beam.

According to the present invention for achieving the object as described above, in the impact beam mounted on the door of the vehicle to absorb the shock, two beams of both ends are inserted and combined in one central beam, the impact energy absorption characteristics In order to improve the impact beam for an automobile door, it is characterized in that the connection between the beam of the two ends and the center beam by bolts or rivets.

Further, more preferably, the cross-sections of the both side beams and the central beam are configured in the form of either a rectangular or circular hollow beam.

In addition, in the impact beam mounted on the door of the vehicle to absorb shock, a plurality of beams are inserted in both ends of the central beam in a symmetrical line to be combined in multiple stages, and the beam and the beam of the beam to improve the impact energy absorption characteristics An impact beam for a car door is provided, characterized in that the connection is bolted or riveted.

Further, more preferably, a high friction material such as Teflon, nylon or polyethylene is coated on the contact surface of the beam constituting the impact beam, or a lubricant such as grease is applied.

Further preferably, the reinforcement is inserted into the inner side of the central beam to improve bending strength and prevent local depression by buckling.

Furthermore, even more preferably, the beams at both ends allow the cross section to increase in the direction of breakage at the joining portion in order to increase the impact energy absorption efficiency and prevent the beam from leaving completely.

1A is a perspective view of an automobile door impact beam according to a first embodiment of the present invention.

The impact beam 110 is made of fiber reinforced polymer composite material composed of glass, aramid, or a mixture of these fibers and epoxy, polyester, or vinylester. Alternatively, steel or aluminum may be used as a hybrid.

1B is an exploded and assembled view of an automobile door impact beam according to a first embodiment of the present invention.

As shown in FIG. 1B, the impact beam 110 of the automobile door of the present invention is composed of two beams 111 and a center beam 112, and the beams 111 and a beam 112. ) Is assembled with bolts or rivets 121.

The cross-sections of the both side beams 111 and the center beam 112 are shown as quadrangles in FIG. 1B, but may also be configured as beams having a circular cross section.

1C is a reference diagram illustrating a case where an impact beam according to a first embodiment of the present invention is broken by a bending load.

Referring to FIG. 1C, bolts or rivets of the coupling structure support the loads, and above a certain load, both side beams 111 or the center beams 112 are pulled out so that shear failure occurs, and such failures are progressive. Because of the occurrence of the impact energy absorption increases.

In order to effectively absorb impact energy of the impact beam, Teflon, nylon or polyethylene having a low coefficient of friction is coated on the surfaces of the beam 111 and the center beam 112, or a lubricant such as grease is applied. Thus, slipping can be induced between beams.

1D is a reference diagram for explaining a failure area ratio according to the principles of the present invention.

The ratio of the cross-sectional area of the bolt or rivet 133, the product of the end distances 131a and 131b and the beam thicknesses 132a and 132b, which are the distances between the drilled holes and the beam ends for the assembly of the impact beam, Assume that the damage area ratio as in 1].

And, in order to effectively absorb the impact energy, the damage area ratio is designed as follows.

The breakage area ratio is 0.4 to 1 for steel beams, the breakage area ratio is 0.5 to 1.5 for aluminum beams, and 3 to 5 for fiber-reinforced polymer composite materials.

FIG. 2A is a perspective view illustrating an impact beam 210 of an automobile door according to a second exemplary embodiment of the present invention, and FIG. 2B is an assembly view thereof.

As shown in FIGS. 2A and 2B, two bilateral beams 211, one central beam 212, and a coupling part using bolts or rivets 221 are used, and the strength and impact energy absorption characteristics of the constructed beams are shown. The reinforcing material 213 is inserted between the both end beams 211 to increase the. As such a reinforcing material, various materials such as a foam, plastic, a composite material, or a metal may be used.

Since the reinforcing material 213 is mounted in the central beam 212 that is locally loaded, it has an effect of increasing bending strength and preventing local depression by buckling.

Figure 3a is a detailed view for the impact beam assembly of the automobile door according to the third embodiment of the present invention, Figure 3b is a sectional view II 'of the impact beam shown in Figure 3a, Figure 3c is the impact beam shown in Figure 3a Is a cross-sectional view of another embodiment for modifying a cross section of a.

As shown in FIG. 3A, the impact beam is composed of two bilateral beams 311, one central beam 312 and a coupling part using bolts or rivets 321, and the efficiency of energy absorption when the coupling part breaks. The cross section of the beams 311 at both ends may be modified for the purpose of preventing complete departure.

As shown in Figure 3b, the cross section increases in the direction of the arrow broken in the coupling portion to effectively support the bending load and at the same time efficient shock energy absorption, it is designed to prevent complete departure from the thickest end . In order to prevent complete departure, the breakage area ratio is set to 0.8 or more for the steel beam, 1 or more for the aluminum beam, and 4 or more for the fiber reinforced polymer composite material.

As shown in FIG. 3C, the cross-sections of the beams 311 at both ends may be modified to increase the efficiency of energy absorption upon breakage of the coupling portion and to prevent complete departure.

4 is a perspective view illustrating an impact beam of an automobile door according to a fourth exemplary embodiment of the present invention.

As shown in Figure 4, it is composed of four or more multi-stage beam and coupling portion can be more maximized impact energy absorption. For reference, the impact beam illustrated in FIG. 4 is a case where five beams are configured, and the number of beams is not limited to this drawing. That is, it is applied to all the multi-stage beams using the present principle.

In the third and fourth embodiments, the reinforcement may be used for the same principle and purpose as in the second embodiment.

Although the technical spirit of the present invention has been described above with reference to the accompanying drawings, it is intended to exemplarily describe the best embodiment of the present invention, but not to limit the present invention. In addition, it is obvious that any person skilled in the art may make various modifications and imitations without departing from the scope of the technical idea of the present invention.

According to the present invention as described above, by providing the impact beam for the vehicle door, it is possible to effectively absorb the impact energy, thereby contributing to the improvement of the safety of the automobile passengers.

1A is a perspective view of an automobile door impact beam according to a first embodiment of the present invention;

1B is an exploded view of an automobile door impact beam according to a first embodiment of the present invention,

FIG. 1C is a reference diagram illustrating when an impact beam according to a first embodiment of the present invention is broken,

Figure 1d is a reference diagram for explaining the failure area ratio in accordance with the principles of the present invention,

2A is a perspective view of an automobile door impact beam according to a second embodiment of the present invention;

Figure 2b is a structural assembly diagram of a vehicle door impact beam according to a second embodiment of the present invention,

3A is an assembly detail view of an automobile door impact beam according to a third embodiment of the present invention;

3B is a cross-sectional view of the end beam according to the third embodiment of the present invention,

3C is a cross-sectional view showing another embodiment of the end beam shown in FIG. 3B;

4 is a perspective view illustrating the automobile door impact beam according to the fourth embodiment of the present invention.

Explanation of symbols on main parts of the drawings

110, 210: Impact beam for car door

111, 211, 311: bilateral beams

112, 212, 312: center beam

121, 133, 221, 321: bolts or rivets

213: reinforcement

131a, 131b: end distance (distance between hole for assembly and beam end)

132a, 132b: beam thickness

Claims (8)

In the impact beam mounted on the door of the vehicle to absorb shocks, A central beam which is hollow and has holes penetrating at a predetermined distance (end distance) from both ends; Two bilateral beams, each of which has a hollow shape that can be inserted into the central beam and has a hole corresponding to the hole penetrating a predetermined distance from one end; and A bolt or rivet fastened to and integral with the holes with one end of each of the two end beams being respectively inserted into both ends of the central beam, The thickness and the end distance of the center beam and the both ends beams are designed in consideration of the damage area ratio ((end distance x beam thickness) / cross section of the bolt or rivets). The method of claim 1, Cross section of the central beam and the both ends of the beam beam impact beam, characterized in that the hollow or rectangular hollow beam. The method of claim 1, The damage area ratio is 0.4 ~ 1 for the steel beam, 0.5 ~ 1.5 for the aluminum beam, 3 ~ 5 for the fiber reinforced polymer composite material, characterized in that the impact beam for the car door. In the impact beam mounted on the door of the vehicle to absorb shocks, A central beam which is hollow and has holes penetrating at a predetermined distance (end distance) from both ends; A plurality of both side beams formed of a hollow type which can be sequentially inserted in a row in a symmetrical multi-stage direction in the direction of both ends with respect to the center beam, and the holes corresponding to the holes penetrate a predetermined distance from the ends; A bolt or rivet fastened to and integral with the holes with one end of the outer beam inserted into the inner beam relative to the central beam, The thickness and the end distance of the center beam and the both ends beams are designed in consideration of the damage area ratio ((end distance x beam thickness) / cross section of the bolt or rivets). The method according to claim 1 or 4, Impact beam for an automobile door, characterized in that the contact surface between the beam is coated with a high friction material such as Teflon, nylon or polyethylene, or a lubricant such as grease (Grease) is applied. The method according to claim 1 or 4, The impact beam for a car door, characterized in that the reinforcement for inserting the central beam further improves bending strength and prevents local depression by buckling. The method of claim 6, The reinforcing material is an impact beam for an automobile door, characterized in that made of any one of the foam (foam), plastic or metal. The method according to claim 1 or 4, The beams on both sides of the impact beam for the automobile door, characterized in that the cross-section is increased in the direction of the end broken in the hole in order to increase the impact energy absorption efficiency and prevent the complete departure of the beam.