JPH0629064Y2 - Shock absorbing structure for automobile door - Google Patents

Description

Detailed Description of the Invention a. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a vehicle door impact absorption structure, and more particularly to a structure in which a door guard bar is arranged inside the door in the front-rear direction.

b. 2. Description of the Related Art As a structure of this type, for example, as shown in FIG.
It is proposed that the door guard bar 101 is arranged inside the 100 in the front-rear direction (see Jitsuko Sho 59-34507). More specifically, the door 101 is provided with a bead portion 102 having a corrugated cross section as shown in FIGS. 12 and 13, and both front and rear ends thereof are fixed to a step portion 104a of an inner panel 104 via brackets 103. When a large impact is applied to the side surface of the door 100, the door guard bar 101 expands the bead portion 102 and extends in the front-rear direction to absorb impact energy, whereby the door 100 is largely deformed and the passenger compartment. It is designed to prevent it from slipping into the side.

Further, as shown in FIG. 14 (II), the door guard bar 105 is formed in a roof shape, and a bead portion 10 having a U-shaped cross section is formed at the center thereof.
It is also proposed to provide 6 and arrange it inside the door 100 as shown in FIG. The figure (II
The door guard bar 105 is provided with a contact plate 107 as shown in I), or a gusset 108 is provided between the door guard bar 105 and the contact plate 107 as shown in FIGS. The one designed for is also used.

c. However, in any of the above structures, when the length of the door 100 in the front-rear direction is short, the total length of the door guard bars 101 and 105 is also short, and the side surface of the door 100 is greatly impacted. When
Since a large force is applied to the welded portions at both ends of the card bars 101 and 105, there is a problem in that the door lock mechanism is damaged by being peeled off from this portion without being sufficiently extended. This is because the door guard bar is separated at the Po point as shown in FIG. 15 (I), the deformation amount is small, and the impact energy absorption amount is small.

d. Means for Solving the Problems The present invention has been made in view of the above problems, and an object of the present invention is to solve the above problems by arranging a door guard bar so that it can be largely deformed in response to an impact. An object of the present invention is to provide a shock absorbing structure for an automobile door that can be solved, and the gist thereof is a shock absorbing structure for a door in which a door guard bar is arranged and fixed in the front-rear direction inside the door. And a bead portion is provided in the vicinity of each of the fractured portions so that the door guard bar can be extended in the front-rear direction. It is a shock absorbing structure for automobile doors.

Hereinafter, an embodiment of a vehicle door impact absorbing structure according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 4, reference numeral 1 denotes a door guard bar used in the shock absorbing structure.

The door guard bar 1 comprises a beam 2 and a plate 3, which are arranged inside the door in the front-rear direction, and both longitudinal ends of the beam 2 are fixed to the door by welding or the like. As shown in FIG. 2, rectangular holes 4 extending in the front-rear direction are formed in the beam 2 in rows in the vertical direction at predetermined intervals, and these holes 4 are vertically arranged between adjacent rows. They are arranged so that they alternate in the direction (that is, staggered). Further, an arc-shaped rib 5 as a bead portion is formed between the long sides 4a of the adjacent holes 4.

On the other hand, the plate 3 is provided with a rectangular hole 6 at a position corresponding to the rib 5, and a notch 7 is formed at the center of the long side 6a of the hole 6. This makes plate 3
In this case, the fractured portion 8 is formed between the long sides 6a of the holes 6 adjacent to each other.

Then, as shown in FIG. 2, the beam 2 and the plate 3 are overlapped so that the P and Q points thereof coincide with each other, and each hole 6 of the plate 3 is overlapped.
By appropriately welding both sides of the beam, the beam 2
And the plate 3 are integrally formed. In this state, the hole 6 and the breakage portion 8 of the plate 3 face the rib 5 and the hole 4 of the beam 2, respectively, as shown in FIGS. 5 and 6.

Since the shock absorbing structure of the present embodiment is configured in this way, when a large shock is applied to the side surface of the door, tension in the front-rear direction acts on the plate 3 and the breaking portions 8 are broken one after another. With the breakage of the breakage portion 8, the rib 5 adjacent to the breakage portion 8 extends in the front-rear direction. That is, as shown in Fig. 15 (II), the door guard bar 1 deforms toward the passenger compartment while successively breaking the breaking portions 8 to absorb the impact energy (P ₁ , P ₁ ... P in the drawing). _{At the} point _n , the breaking portion 8 breaks), and the amount of deformation (ie, absorbed energy) can be increased as compared with the conventional one shown in FIG.

As shown in FIG. 7, the plate 3 has a broken portion 8
It is preferable that the width w and the length l of the holes 6 be different in the vertical rows. In this way, when a shock is applied, there is no risk of the breaking portions 8 in the same row breaking at the same time, and the door guard bar 1 can be smoothly deformed to absorb a large amount of energy.

Next, a modified example of the door guard bar of the present invention will be described.

As shown in FIGS. 8 and 9, a pair of plates 3 and 3'having the same structure as those of the above-described embodiment are arranged in parallel with each other, and a corrugated beam 10 is arranged and fixed between the plates 3 and 3 ' The plate 3 ′ may be curved inward corresponding to the beam 10.

Further, as shown in FIG. 10, the plate 20 has an elliptical recess 21.
The door guard bar 23 may be formed by alternately arranging the holes 22 and the holes 22.

e. Effect of the Invention According to the present invention, when a large impact is applied to the side surface of the door,
The door guard bar deforms while breaking its fractured part one after another, and the bead part expands in the front-rear direction along with the fracture, so this guard bar has a larger deformation amount than the conventional one. The amount of energy absorbed increases. Therefore, compared with the conventional structure, it is possible to withstand a larger impact, and the possibility that the door guard bar may be peeled off from the fixed portions at both ends thereof and damage the door lock mechanism is reduced.

Further, the durability against impact can be controlled by changing the breakage portion 8.

Further, since the beam and the plate provided with a large number of holes are combined, a relatively lightweight door guard bar can be obtained.

[Brief description of drawings]

1 to 6 show an embodiment of a vehicle door shock absorbing structure according to the present invention, FIG. 1 is a perspective view showing a door guard bar used in the structure, and FIG. 2 is an exploded view of the door guard bar. 3 is a perspective view of the beam shown in FIG. 2 viewed from the direction of arrow C, FIG. 4 is a view of the plate shown in FIG. 2 viewed from the direction of arrow D, FIG. FIG. 6 is a sectional view taken along the lines AA and BB shown in FIG. 1,
7 to 10 each show a modification of the door guard bar shown in FIG. 1, FIG. 7 is an enlarged front view of a part of a plate used for the door guard bar, and FIG. 8 is the door guard. 9 is a partial perspective view of the bar, and FIG.
FIG. 10 is a partial perspective view of the door guard bar seen from the direction, FIGS. 11 to 13 show a conventional shock absorbing structure of a door, and FIG. 11 is a front view showing a cutaway part of the door. Figure, first
12 and 13 are respectively FF line and G shown in FIG.
-A sectional view taken along the line G, Fig. 14 shows another conventional example, and Fig. 14 (I) is a perspective view of the door seen through the door guard bar.
(II) is a perspective view of the door guard bar shown in (I), and (III) and (IV) are perspective views showing modifications of the door guard bar shown in (II). Figure (V)
Is a cross-sectional view taken along the line H-H shown in FIG. 4 (IV), and FIG. 15 is a diagram showing the amount of deformation of the door guard bar due to the impact. Related to. 1 ... door guard bar, 2 ... beam, 3 ... plate, 4 ... hole, 5 ... rib, 6 ... hole, 7 ... notch, 8 ... broken part.

Claims (1)

[Scope of utility model registration request] 1. A door impact-absorbing structure in which a door guard bar is arranged and fixed in the front-rear direction inside a door, and a large number of holes are provided in the door guard bar, and a break portion is formed between adjacent holes, and A shock absorbing structure for an automobile door, characterized in that a bead portion is disposed near each of the break portions so that the door guard bar can be extended in the front-rear direction.