JP-7857386-B2 - Shock absorber

Inventors

• 村上 清史
• 澤渡 弘茂

Assignees

• 森六株式会社

Dates

Publication Date

20260512

Application Date

20241218

Priority Date

20240220

Claims (5)

1. A door panel for the vehicle and a door trim, which covers this door panel from the passenger compartment side and is part of the interior of the passenger compartment, are located between them. A protruding portion extends from the door trim side toward the door panel side, with its tip capable of receiving the door panel and its base end separated from the back surface of the door trim, The protruding portion comprises a fixing portion provided on the outer circumference of the base end of the protruding portion and capable of being fixed to the door trim, The base end of the protruding portion and the fixed portion are connected via an annular connecting portion. The connecting portion has an inclined portion that approaches the door trim as it moves radially inward along the axis of the protruding portion, The connecting portion has a second inclined portion that moves away from the door trim as it extends radially inward along the axis of the protruding portion. The second inclined portion connects the inclined portion and the fixed portion. The back surface of the aforementioned door trim is provided with a base that protrudes toward the door panel side, The fixing portion is fixable to the base portion, An impact absorber in which, with reference to the direction in which the axis of the protrusion extends, the base end of the protrusion is in the same position as the tip of the base .
2. A door panel for the vehicle and a door trim, which covers this door panel from the passenger compartment side and is part of the interior of the passenger compartment, are located between them. A protruding portion extends from the door trim side toward the door panel side, with its tip capable of receiving the door panel and its base end separated from the back surface of the door trim, The protruding portion comprises a fixing portion provided on the outer circumference of the base end of the protruding portion and capable of being fixed to the door trim, The base end of the protruding portion and the fixed portion are connected via an annular connecting portion. The connecting portion has an inclined portion that approaches the door trim as it moves radially inward along the axis of the protruding portion. The connecting portion has a second inclined portion that moves away from the door trim as it extends radially inward along the axis of the protruding portion. The second inclined portion connects the inclined portion and the fixed portion. The back surface of the aforementioned door trim is provided with a base that protrudes toward the door panel side, An impact absorber in which , with reference to the direction in which the axis of the protrusion extends, the base end of the protrusion is closer to the door trim than the tip of the base.
3. An impact absorber according to claim 1 or claim 2 , Multiple holes extending along the axis are provided in the aforementioned protruding portion.
4. The shock absorber according to claim 3 , The hole extends to the base end of the protrusion.
5. An impact absorber according to claim 1 or claim 2 , A second connecting portion is interposed between the base end of the protruding portion and the connecting portion. The second connecting portion is annular in shape and extends parallel to the back surface of the door trim.

Description

This invention relates to an impact absorber positioned between a door panel and a door trim. The door trim is an interior trim component installed on the passenger compartment side of the door panel. It is known that impact absorbers can be placed between such door trims and door panels to enhance occupant protection. Various shapes of this type of shock absorber have been proposed (see, for example, Patent Document 1 (Figures 2, 7(a), (b))). Patent Document 1 will be explained based on the following figure. Figure 9(a) is a partial cross-sectional view of a conventional vehicle equipped with an impact absorber. As shown in Figure 9(a), a seat 102 for the occupant is arranged in the passenger compartment 101 of the vehicle 100. The door 110, located next to the seat 102, comprises a hollow door panel 111, a window glass 112, and a door trim 113 as an interior lining member. Furthermore, an impact absorber 120 is provided between the door trim 113 and the door panel 111. The impact absorber 120 absorbs collision energy by deforming. In the diagram, when a large force is applied from outside the vehicle toward the passenger compartment 101, the door panel 111 deforms and penetrates into the passenger compartment 101. Then, the door trim 113 hits the seat 102, and the impact absorber 120 collapses. This collapse mitigates the large force, reducing the impact on the occupant sitting in the seat 102. Figure 9(b) is an enlarged view of section b in Figure 9(a). As shown in Figure 9(b), the shock absorber 120 consists of a flange 121 fixed to the door trim 113, a large-diameter cylindrical portion 122 extending from the flange 121 toward the door panel 111, a large-diameter donut plate 123 provided at the tip of the large-diameter cylindrical portion 122, a medium-diameter cylindrical portion 124 extending from the edge of the hole in the large-diameter donut plate 123 toward the door panel 111, a medium-diameter donut plate 125 provided at the tip of the medium-diameter cylindrical portion 124, a small-diameter cylindrical portion 126 extending from the edge of the hole in the medium-diameter donut plate 125 toward the door panel 111, and a lid 127 that closes the tip opening of the small-diameter cylindrical portion 126. The impact absorber 120 has a stepped shape when viewed in cross-section. Figure 9(c) is a diagram showing the operation of a conventional shock absorber 120. Because the shock absorber 120 has a stepped shape, it easily collapses, as shown in Figure 9(c). When examining this deformation, the large-diameter donut plate 123 and the medium-diameter donut plate 125 are perpendicular to the axis of application of the external force 128, so they bend easily. Therefore, the shock absorber 120 collapses stably as a whole. On the other hand, the shock absorption of the shock absorber 120 becomes gentler, and its shock absorption performance decreases. In the case of the shock absorber 120, there may be a demand to improve its shock absorption performance. Therefore, various structures with higher shock absorption performance than those in Reference Document 1 have been proposed (see, for example, Patent Document 2 (Figure 2)). Patent Document 2 will be explained based on the following figure. Figure 10 is a cross-sectional view of a conventional shock absorber. As shown in Figure 10, the shock absorber 130 consists of a flange 131, a tapered cylindrical portion 132 extending from the flange 131 and tapering towards the end, and a lid 133 that closes the opening at the tip of the tapered cylindrical portion 132. Because this type of shock absorber 130 lacks the large-diameter donut plate 123 and medium-diameter donut plate 125 shown in Figure 9(b), its rigidity is increased, resulting in higher shock absorption performance. In other words, when an external force F1 is applied along the axis 134 of the tapered cylindrical portion 132, the tapered cylindrical portion 132 collapses and exhibits the desired shock absorption performance. However, when subjected to an external force F2 applied in a direction inclined with respect to the axis 134 of the tapered cylindrical portion 132, angles θa and θb do not change easily, causing the tapered cylindrical portion 132 to collapse in an irregular manner, reducing its shock absorption performance and making it unstable. By the way, in cases of side collisions, where a large external force is applied to a vehicle from the side, external force F2 is more frequent than external force F1. Therefore, a shock absorber that can stably absorb impacts applied at an angle is desired. Japanese Patent Publication No. 2022-140743Japanese Patent Publication No. 2015-205671 Figure 1(a) is a cross-sectional view of the shock absorber according to the first embodiment, and Figure 1(b) is a diagram illustrating the configuration in which the shock absorber is attached to a vehicle.Figure 2(a) illustrates the action of the shock absorber according to the comparative example, and Fi