JP2022192069A - shock absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shock absorber for suppressing change in load absorption upon being deformed.

SOLUTION: There is provided a cylindrical shock absorber 30 which is arranged between a vehicular door panel 2 and a trim 3 covering a side surface of the door panel and projects from the trim to the door panel. The shock absorber comprises a plurality of cylindrical peripheral walls which are aligned in projection direction directing from a proximal edge at the trim side to a distal end at the door panel side and have narrowed width in direction orthogonal to the projection direction at the distal side when compared the width of the peripheral walls each other; a plurality of connection walls connecting edge parts of adjacent peripheral walls; and an end wall 36 closing an end part of the most distal peripheral wall. The peripheral walls comprise a first peripheral wall 31, a second peripheral wall 32 and a third peripheral wall 33 in an order from distal side. The connection walls comprise a first connection wall 34 and a second connection wall 35. Each of the first peripheral wall, the second peripheral wall and the third peripheral wall has the same length in the projection direction. The second peripheral wall and the third peripheral wall have the same volume. The first peripheral wall has a volume smaller than the second peripheral wall.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2023,JPO&INPIT

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impact absorber arranged between a door panel and trim.

2. Description of the Related Art There is a well-known configuration of an automobile door in which a shock absorber is arranged between a door panel and a door trim that covers the side of the passenger compartment of the door panel in order to reduce the impact that the door panel exerts on an occupant in the event of a side collision. Among such impact absorbers, there is one in which a resin cylinder extending from the door trim toward the door panel is gradually narrowed toward the door panel to form a stepped shape (for example, Patent Document 1). In this shock absorber, each step deforms step by step according to displacement (deformation amount), so that a rapid increase in load (reaction force) can be suppressed.

JP-A-7-315076

Such a stepped shock absorber is easily deformed because the stepped portion on the distal end side is narrower than the stepped portion on the proximal end side. Therefore, the stepped portion on the distal end side is deformed in the initial stage of deformation, and the stepped portion on the proximal side is deformed in the late stage of deformation. As a result, a load peak occurs due to the deformation of each step, and the load fluctuates according to the amount of deformation of the shock absorber. In addition, since the stepped portion on the base end side requires a large load for deformation, the load (reaction force) increases in the latter stage of the deformation, and there is a problem that the load is easily transmitted to the occupant.

SUMMARY OF THE INVENTION In view of the above background, an object of the present invention is to suppress variation in absorbed load during deformation in a shock absorber.

In order to solve the above problems, a first aspect of the present invention provides a cylinder projecting from the trim toward the door panel between the door panel (2) of the vehicle and the trim (3) covering the side surface of the door panel. a plurality of shock absorbers (30) arranged in a projecting direction from the base end on the trim side to the tip on the door panel side, and the closer to the tip side the more narrow in the direction orthogonal to the projecting direction A plurality of cylindrical peripheral walls (31, 32, 33) having a width, a plurality of connecting walls (34, 35) connecting the edges of the adjacent peripheral walls, and the ends of the peripheral walls on the most distal side. The peripheral wall includes a first peripheral wall (31), a second peripheral wall (32), and a third peripheral wall (33) in order from the tip end side, and the connecting wall comprises the including a first connecting wall (34) connecting the first peripheral wall and the second peripheral wall, and a second connecting wall (35) connecting the second peripheral wall and the third peripheral wall, the first peripheral wall, Each of the second peripheral wall and the third peripheral wall has the same length in the projecting direction, the second peripheral wall and the third peripheral wall have the same volume, and the first peripheral wall has the third peripheral wall. It is characterized by having a volume smaller than that of the two peripheral walls.

According to this aspect, since the second peripheral wall and the third peripheral wall have the same volume, the difference between the amount of deformation of the second peripheral wall and the third peripheral wall and the absorbed load can be reduced. Since the first peripheral wall is connected to the end wall, the first peripheral wall absorbs more load than the second peripheral wall for the same volume. Therefore, by making the volume of the first peripheral wall smaller than the volume of the second peripheral wall, it is possible to reduce the difference in the absorbed load with respect to the amount of deformation of the first peripheral wall and the second peripheral wall. As a result, it is possible to suppress the variation of the absorbed load with respect to the amount of deformation of the shock absorbing body, and to suppress the transmission of the load to the occupant.

Said 1st aspect WHEREIN: It is good for a said 1st surrounding wall to have thickness smaller than a said 2nd surrounding wall.

According to this aspect, it is possible to reduce the difference between the absorbed load and the amount of deformation of the first peripheral wall and the second peripheral wall.

Said 1st aspect WHEREIN: It is good for a said 1st surrounding wall to have a larger thickness than a said 3rd surrounding wall.

According to this aspect, the difference between the absorbed load and the amount of deformation of the first peripheral wall and the third peripheral wall can be reduced.

A second aspect of the present invention is a cylindrical shock absorber (30) projecting from the trim toward the door panel between the door panel (2) of the vehicle and the trim covering the side surface of the door panel (3). and a plurality of tubular cylindrical members arranged in a projecting direction from a base end on the trim side to a tip end on the door panel side, and having a narrower width in a direction orthogonal to the projecting direction toward the tip end side. Peripheral walls (31, 32, 33), a plurality of connecting walls (34, 35) connecting the edges of the adjacent peripheral walls, and an end wall (36) closing the ends of the peripheral walls closest to the distal end. The peripheral wall includes a first peripheral wall (31), a second peripheral wall (32), and a third peripheral wall (33) in order from the tip side, and the connecting wall comprises the first peripheral wall and the second peripheral wall. and a second connecting wall connecting the second peripheral wall and the third peripheral wall, wherein the first peripheral wall has a greater thickness than the second peripheral wall, and the The second peripheral wall is characterized by having a thickness greater than that of the third peripheral wall.

According to this aspect, since the rigidity of the peripheral wall arranged on the distal end side is increased, the difference in the absorbed load with respect to the amount of deformation of each peripheral wall can be reduced. As a result, it is possible to suppress the variation of the absorbed load with respect to the amount of deformation of the shock absorbing body, and to suppress the transmission of the load to the occupant.

In the above second aspect, each of the first peripheral wall, the second peripheral wall, and the third peripheral wall may have the same length and the same volume in the projecting direction.

According to this aspect, it is possible to reduce the difference in absorbed load with respect to the amount of deformation of each peripheral wall.

In the above first and second aspects, each of the first, second, and third peripheral walls has a cylindrical cross-section, and is approximately equal to the distal diameter relative to the proximal diameter. The smaller the side diameter the better.

According to this aspect, when a load is applied, the shock absorbing body can be smoothly deformed in the axial direction (protruding direction) and contracted.

Said 1st and 2nd aspect WHEREIN: It is good for a said 1st connection wall and a said 2nd connection wall to have mutually equal thickness. The length from the inner peripheral edge to the outer peripheral edge of the first connecting wall and the length from the inner peripheral edge to the outer peripheral edge of the second connecting wall may be equal to each other.

According to this aspect, the structure of the impact absorber can be simplified.

In the above first and second aspects, each of the length from the inner peripheral edge to the outer peripheral edge of the first connecting wall and the length from the inner peripheral edge to the outer peripheral edge of the second connecting wall is the first peripheral wall , the second peripheral wall, and the third peripheral wall in the projecting direction.

According to this aspect, each peripheral wall can be easily deformed, and each connecting wall can be made difficult to deform.

In the above first and second aspects, the first peripheral wall is connected to the end wall, and the end of the third peripheral wall is provided with a flange (41) extending outward from the third peripheral wall. It should be

According to this aspect, the flange increases the contact area between the shock absorber and the trim, so that the shock absorber, which receives the load from the frame member, can stably receive the reaction force from the trim. As a result, the load is reliably transmitted from the frame member to the shock absorber, and the shock absorber can efficiently absorb the load.

According to the first aspect of the present invention, since the second peripheral wall and the third peripheral wall have the same volume, it is possible to reduce the difference in the absorbed load with respect to the amount of deformation of the second peripheral wall and the third peripheral wall. Since the first peripheral wall is connected to the end wall, the first peripheral wall absorbs more load than the second peripheral wall for the same volume. Therefore, by making the volume of the first peripheral wall smaller than the volume of the second peripheral wall, it is possible to reduce the difference in the absorbed load with respect to the amount of deformation of the first peripheral wall and the second peripheral wall. As a result, it is possible to suppress the variation of the absorbed load with respect to the amount of deformation of the shock absorbing body, and to suppress the transmission of the load to the occupant.

In the first aspect, according to the aspect in which the first peripheral wall has a thickness smaller than that of the second peripheral wall, it is possible to reduce the difference in the absorbed load with respect to the amount of deformation of the first peripheral wall and the second peripheral wall.

In the first aspect, according to the aspect in which the first peripheral wall has a thickness greater than that of the third peripheral wall, it is possible to reduce the difference in absorbed load with respect to the amount of deformation of the first peripheral wall and the third peripheral wall.

According to the second aspect of the present invention, since the rigidity of the peripheral wall arranged on the distal end side is increased, the difference in the absorbed load with respect to the amount of deformation of each peripheral wall can be reduced. As a result, it is possible to suppress the variation of the absorbed load with respect to the amount of deformation of the shock absorbing body, and to suppress the transmission of the load to the occupant.

In the second aspect, each of the first peripheral wall, the second peripheral wall, and the third peripheral wall has the same length in the projecting direction and the same volume. The load difference can be reduced.

In the first and second aspects, each of the first peripheral wall, the second peripheral wall, and the third peripheral wall has a cylindrical cross section and has a smaller diameter on the distal side than the diameter on the proximal side. Accordingly, when a load is applied, the shock absorbing body can be smoothly deformed in the axial direction (protruding direction) and contracted.

In the first and second aspects, the first connecting wall and the second connecting wall have the same thickness, or the length from the inner peripheral edge to the outer peripheral edge of the first connecting wall and the inner peripheral edge of the second connecting wall According to the mode in which the lengths from the edge to the outer peripheral edge are equal to each other, the structure of the shock absorber can be simplified.

In the first and second aspects, each of the length from the inner peripheral edge to the outer peripheral edge of the first connecting wall and the length from the inner peripheral edge to the outer peripheral edge of the second connecting wall is the first peripheral wall, the second peripheral wall, and the length in the protruding direction of each of the third peripheral walls, each peripheral wall can be easily deformed, and each connecting wall can be made difficult to deform.

In the first and second aspects, according to the aspect in which the end portion of the third peripheral wall is provided with a flange extending outward from the third peripheral wall, the flange increases the contact area between the shock absorber and the trim. Therefore, the shock absorber that receives the load from the frame member can stably receive the reaction force from the trim. As a result, the load is reliably transmitted from the frame member to the shock absorber, and the shock absorber can efficiently absorb the load.

The side view which shows the door provided with the impact-absorbing body which concerns on embodiment. II-II sectional view of Fig. 1 Side view showing the exterior side of the door trim Perspective view of shock absorber Cross-sectional view of shock absorber Explanatory drawing showing a deformation mode of the shock absorber Graph showing load characteristics against displacement of shock absorber Perspective view of a shock absorber according to a modification

An embodiment in which a shock absorber according to the present invention is applied to a right front seat door of an automobile will be described below with reference to the drawings.

(Overall configuration of door)
As shown in FIGS. 1 and 2, a door 1 for a front right seat of an automobile has a door panel 2 as a frame member and a door trim 3 provided to cover the inner side surface of the door panel 2 . The door panel 2 has an inner panel 4 and an outer panel 5 made of steel. The inner panel 4 is arranged on the vehicle inner side (vehicle interior side) of the outer panel 5 forming the outer surface of the vehicle body. The inner panel 4 and the outer panel 5 are joined to the outer panel 5 at the front edge, the lower edge, and the rear edge, excluding the upper edge, to form a space in the center.

A plurality of reinforcing members 7 are provided on the outer side surface and the inner side surface of the inner panel 4 . The reinforcing member 7 extends substantially back and forth from the front edge of the inner panel 4 to the rear edge. The reinforcing member 7 is formed from a channel member, a pipe member, or the like. The reinforcing member 7 may have, for example, a groove-shaped cross section and form a closed cross section together with the inner panel 4 .

Between the inner panel 4 and the outer panel 5, a window glass 11 and its elevating device (not shown) are arranged. The window glass 11 moves up and down through an opening formed between the upper edges of the inner panel 4 and the outer panel 5 .

The door trim 3 is made of a resin material. The door trim 3 includes a trim main body portion 13 arranged on the inner side of the inner panel 4 and protruding toward the inner panel 4 from the peripheral edge of the trim main body portion 13. and an abutting trim edge wall 14 . The trim edge wall portion 14 extends along the periphery of the trim body portion 13 .

An armrest portion 15 that bulges toward the vehicle interior is provided in the center portion of the trim main body portion 13 in the vertical direction. The armrest portion 15 extends longitudinally from the center of the trim body portion 13 to the rear edge thereof. A switch for operating the lifting device is provided on the upper surface of the armrest portion 15 .

A speaker 16 is provided at the lower front portion of the trim body portion 13 . A pocket portion 17 that bulges toward the interior of the vehicle is provided in a lower portion of the trim main body portion 13 and positioned behind the speaker 16 . The pocket portion 17 forms a recess opening upward. The pocket portion 17 is arranged below the front portion of the armrest portion 15 .

A bulging portion 18 that bulges toward the vehicle interior is provided at the lower rear portion of the trim body portion 13 . The bulging portion 18 is arranged below the rear portion of the armrest portion 15 and behind the pocket portion 17 . The vehicle interior side surface of the bulging portion 18 forms a flat surface facing in the left-right direction, and smoothly continues to the rear lower portion of the armrest portion 15 and the rear portion of the pocket portion 17 . A vehicle-exterior portion of the bulging portion 18 is recessed toward the vehicle interior to form a space 19 with the inner panel 4 . A vehicle exterior side surface of the bulging portion 18 is formed into a flat surface facing in the left-right direction.

A shock absorber 30 is arranged in the space 19 between the bulging portion 18 and the inner panel 4 . The shock absorber 30 may be supported by either the door trim 3 or the inner panel 4 . In this embodiment, the shock absorber 30 is supported on the vehicle outer side surface of the bulging portion 18 (the surface facing the inner panel 4 side).

(Impact Absorber: First Embodiment)
The shock absorber 30 according to the first embodiment can be made of various materials such as resin materials and metal materials. The resin material may be, for example, a fiber-reinforced resin containing fibers such as polypropylene, polyethylene, carbon, glass, and nanocellulose. When fiber-reinforced resin is used, the elastic modulus and tensile strength of the material are improved, so that the shock absorber 30 can be made thinner and smaller. As a result, weight reduction becomes possible. When a resin material is used as the material, the shock absorber 30 can be formed by a known molding technique such as injection molding.

When fiber-reinforced resin containing nanocellulose is used as the material, the base material may be polyethylene, polypropylene, or the like. Moreover, it is preferable that the base material forms a lamellar layer, and the lamellar layer is laminated in a direction different from the fiber length direction of the nanocellulose.

As shown in FIGS. 2 and 3, the shock absorber 30 is a cylindrical member protruding from the door trim 3 toward the inner panel 4, and has a tip on the inner panel 4 side with respect to a base end on the door trim 3 side. The width is narrowly formed in a step-like manner. As shown in FIGS. 4 and 5, the shock absorber 30 has a plurality of peripheral walls 31-33, a plurality of connecting walls 34 and 35, and an end wall . The plurality of peripheral walls 31 to 33 are arranged in a protruding direction (vehicle width direction) from the proximal end to the distal end, and are offset from each other in the protruding direction. The plurality of peripheral walls 31 to 33 have narrower widths in the direction orthogonal to the protruding direction as they are arranged closer to the distal end side. The connecting walls 34, 35 connect the edges of the adjacent peripheral walls 31-33 to each other. An end wall 36 is provided so as to close the ends of the peripheral walls 31 to 33 closest to the distal end. The end wall 36 is perpendicular to the projecting direction. In this way, the shock absorber 30 has a pyramidal shape whose width gradually narrows toward the distal end side.

In this embodiment, the peripheral walls 31 to 33 include a first peripheral wall 31, a second peripheral wall 32, and a third peripheral wall 33 provided in order from the distal end side, and the connecting walls 34 and 35 are the first peripheral wall 31 and the second peripheral wall. It includes a first connecting wall 34 provided between the peripheral wall 32 and a second connecting wall 35 provided between the second peripheral wall 32 and the third peripheral wall 33 . The first peripheral wall 31 and the end wall 36 form a first stepped portion 37, the second peripheral wall 32 and the first connecting wall 34 form a second stepped portion 38, and the third peripheral wall 33 and the second connecting wall 35 form a second stepped portion 38. A three-stage portion 39 is constructed.

Each of the first to third peripheral walls 31 to 33 has a cylindrical cross section, and is formed such that the diameter on the distal end side is smaller than the diameter on the proximal end side. That is, each of the first to third peripheral walls 31 to 33 is formed in a truncated cone shape with a thin tip end. The first to third peripheral walls 31 to 33 have the same height (length in the direction along the axis X). The thickness T1 of the first peripheral wall 31, the thickness T2 of the second peripheral wall 32, and the thickness T3 of the third peripheral wall 33 are set to different values.

The second peripheral wall 32 and the third peripheral wall 33 have volumes equal to each other. Thereby, the second peripheral wall 32 has a greater thickness than the third peripheral wall 33 .

The first peripheral wall 31 has a smaller volume than the second peripheral wall 32 . The first peripheral wall 31 may have an arbitrary thickness with respect to the second peripheral wall 32 and the third peripheral wall 33 . For example, the first peripheral wall 31 may have a smaller thickness than the second peripheral wall 32 . Also, the first peripheral wall 31 may have a greater thickness than the third peripheral wall 33 .

The first connecting wall 34 connects the proximal edge of the first peripheral wall 31 and the distal edge of the second peripheral wall 32 . The first connecting wall 34 extends along the proximal side edge of the first peripheral wall 31 and the distal side edge of the second peripheral wall 32 and is formed in an annular shape. The second connecting wall 35 connects the proximal side edge of the second peripheral wall 32 and the distal side edge of the third peripheral wall 33 . The second connecting wall 35 extends along the proximal side edge of the second peripheral wall 32 and the distal side edge of the third peripheral wall 33 and is formed in an annular shape.

The first connecting wall 34 and the second connecting wall 35 are formed in a plate shape whose surfaces are perpendicular to the axis X. As shown in FIG. The first connecting wall 34 and the second connecting wall 35 have the same thickness. The length from the inner peripheral edge to the outer peripheral edge of the first connecting wall 34 and the length from the inner peripheral edge to the outer peripheral edge of the second connecting wall 35 are formed to be equal to each other. The length from the inner peripheral edge to the outer peripheral edge of the first connecting wall 34 and the length from the inner peripheral edge to the outer peripheral edge of the second connecting wall 35 are the first peripheral wall 31, the second peripheral wall 32, and the third peripheral wall, respectively. 33 are formed to be smaller than any of the respective heights.

As shown in FIGS. 2 to 4, a flange 41 extending outward from the third peripheral wall 33 is provided at the proximal edge of the third peripheral wall 33 . The flange 41 is formed in a plate shape substantially perpendicular to the projecting direction, and is formed along the entire circumference along the base end side edge of the third peripheral wall 33 .

The shock absorber 30 is connected to the door trim 3 by connecting the flange 41 to the vehicle outer side surface of the bulging portion 18 . The connection between the flange 41 and the bulging portion 18 may be achieved by bonding with an adhesive, double-sided tape, or the like, fastening with screws, locking with locking claws, or the like.

As shown in FIG. 1 , the shock absorber 30 is arranged below the armrest portion 15 when the flange 41 is coupled to the bulging portion 18 .

The end wall 36 may face the vehicle interior side surface of the inner panel 4 via a gap, or may contact the vehicle interior side surface of the inner panel 4 . When viewed along the axis X, the end wall 36 is positioned so that at least a portion of the end wall 36 overlaps the reinforcing member 7 .

(Impact Absorber: Second Embodiment)
The shock absorber 30 according to the second embodiment differs from the shock absorber 30 according to the first embodiment only in the thickness and volume of the first to third peripheral walls 31 to 33, and the other configurations are the same. .

In the shock absorber 30 according to the second embodiment, the first peripheral wall 31 has a greater thickness than the second peripheral wall 32 , and the second peripheral wall 32 has a greater thickness than the third peripheral wall 33 . More preferably, the thickness of each of the first to third peripheral walls 31 to 33 is set so that they have the same volume.

(action/effect)
The action and effect of the shock absorber 30 configured as above will be described. A side collision of the vehicle causes the door 1 to move toward the inside of the vehicle, and the impact absorbing member 30 is compressed in the direction along the axis X between the inner panel 4 and the occupant or the seat on which the occupant is seated.

As shown in FIG. 6, in one mode of compressive deformation of the shock absorber 30, the first peripheral wall 31 and the first connection are deformed from the initial state shown in FIG. The wall 34 deforms and the first peripheral wall 31 moves inside the second peripheral wall 32 . Next, as shown in FIG. 6D, the second peripheral wall 32 and the second connecting wall 35 are deformed and the second peripheral wall 32 moves inside the third peripheral wall 33 . In another aspect, first, the second peripheral wall 32 and the second connecting wall 35 are deformed so that the second peripheral wall 32 moves inside the third peripheral wall 33, and then the first peripheral wall 31 and the first connecting wall 34 are deformed. The first peripheral wall 31 is deformed and moves inside the second peripheral wall 32 . In a desirable mode, the deformation of the first peripheral wall 31 and the first connecting wall 34 and the deformation of the second peripheral wall 32 and the second connecting wall 35 occur simultaneously. Deformation of the peripheral walls 31 to 33 and the connecting walls 34, 35 absorbs the load, thereby suppressing the transmission of the load to the occupant.

FIG. 7 is a graph showing load characteristics with respect to the amount of displacement of the shock absorbers 30 according to Example 1, Example 2, and Comparative Example. FIG. 7 shows the results of measuring the load (reaction force) generated by the shock absorber 30 according to Example 1, Example 2, and the comparative example by compressing the shock absorber 30 along the axis X and for each amount of displacement. ing.

Example 1 is the shock absorber 30 according to the first embodiment, in which the thickness T1 of the first peripheral wall 31 is 1.8 mm, the thickness T2 of the second peripheral wall 32 is 2.0 mm, and the thickness of the third peripheral wall 33 is 1.8 mm. T3 is 1.6 mm, and the thickness of the first connecting wall 34, the second connecting wall 35, the end wall 36, and the flange 41 is 2.0 mm. The first peripheral wall 31 has a thickness smaller than that of the second peripheral wall 32 and a thickness larger than that of the third peripheral wall 33 . The second peripheral wall 32 and the third peripheral wall 33 have equal volumes, and the first peripheral wall has a smaller volume than the second peripheral wall.

Example 2 is the shock absorber 30 according to the second embodiment, which differs from the shock absorber 30 according to the first embodiment only in the thickness and volume of the peripheral walls 31-33. In Example 2, the thickness T1 of the first peripheral wall 31 is 2.6 mm, the thickness T2 of the second peripheral wall 32 is 2.0 mm, and the thickness T3 of the third peripheral wall 33 is 1.6 mm. The first peripheral wall 31 has a thickness greater than that of the second peripheral wall 32 , and the second peripheral wall 32 has a thickness greater than that of the third peripheral wall 33 . Also, each of the first peripheral wall 31, the second peripheral wall 32, and the third peripheral wall 33 has the same volume.

The comparative example differs from the shock absorber 30 according to the first embodiment only in the thickness and volume of the peripheral walls 31-33. In Example 2, the thickness T1 of the first peripheral wall 31 is 2.0 mm, the thickness T2 of the second peripheral wall 32 is 2.0 mm, and the thickness T3 of the third peripheral wall 33 is 2.0 mm. .about.33 have thicknesses equal to each other. The first peripheral wall 31 has a smaller volume than the second peripheral wall 32 , and the second peripheral wall 32 has a smaller volume than the third peripheral wall 33 .

In the comparative example, since the rigidity of the second peripheral wall 32 is higher than the rigidity of the first peripheral wall 31, the first peripheral wall 31 and the first connecting wall 34 are mainly deformed first, and then the second peripheral wall 32 and The second connecting wall 35 is deformed. Therefore, as shown in FIG. 6, the load abruptly increases at the timing when the second peripheral wall 32 and the second connecting wall 35 start to deform (displacement is in the range of 45 to 50 mm).

In Example 2, the volumes of the first to third peripheral walls 31 to 33 are the same, and the first peripheral wall 31 has a greater thickness than the second peripheral wall 32. Therefore, the second peripheral wall 32 and the second connecting wall 35 are formed first. Mainly deformed, then the first peripheral wall 31 and the first connecting wall 34 are deformed. In this case, as shown in FIG. 6, the load increases at the timing when the first peripheral wall 31 and the first connecting wall 34 start to deform (displacement ranges from 45 to 50 mm). However, the amount of load increase in Example 2 is smaller than in Comparative Example.

In Example 1, the volumes of the second peripheral wall 32 and the third peripheral wall 33 are the same, and the volume of the first peripheral wall 31 is smaller than that of the second peripheral wall 32 . As a result, as shown in FIG. 6, deformation of the first peripheral wall 31 and the first connecting wall 34 and deformation of the second peripheral wall 32 and the second connecting wall 35 occur simultaneously. The sudden increase in load disappears. Since the first peripheral wall 31 is connected to the end wall 36, if it has the same volume as the second peripheral wall 32, it has higher rigidity than the second peripheral wall 32 and is less likely to deform. Therefore, by making the volume of the first peripheral wall 31 smaller than the volume of the second peripheral wall 32, deformation of the first peripheral wall 31 and the second peripheral wall 32 can be generated at the same time.

The shock absorber 30 can increase the contact area with the door trim 3 by means of the flange 41 . As a result, the shock absorber 30 that receives the load from the inner panel 4 can receive the reaction force from the door trim 3 with good stability.

Although the specific embodiments have been described above, the present invention is not limited to the above embodiments and can be widely modified. For example, in other embodiments, a plurality of impact absorbers 30 may be provided. Also, the number of steps (the number of peripheral walls 31 to 33) of the shock absorber 30 may be changed arbitrarily within a range of 3 or more.

In addition, the outer cross-sectional shape of each of the peripheral walls 31 to 33 can be various shapes such as square, rectangle, polygon, circle, ellipse and star. As shown in FIG. 8, the peripheral walls 31 to 33 of the shock absorber 70 may have a quadrangular cross-sectional shape (quadrangular cylinder). In this case, the connecting walls 34 and 35 are shaped like a rectangular frame in accordance with the shape of the peripheral walls 31-33. The thicknesses of the peripheral walls 31 to 33 and the connecting walls 34, 35 are set so as to satisfy the relationship in the first embodiment or the second embodiment. Other configurations of the shock absorber 70 may be the same as those of the shock absorber 30 .

1: Door 2: Door panel (framework member)
3: Door trim 15 : Armrest portion 30 : Shock absorber 31 : First peripheral wall 32 : Second peripheral wall 33 : Third peripheral wall 34 : First connecting wall 35 : Second connecting wall 36 : End wall 37 : First stepped portion 38 : Second step 39 : Third step 41 : Flange X : Axis

Claims (1)

A cylindrical shock absorber projecting from the trim toward the door panel between the door panel of the vehicle and the trim covering the side surface of the door panel,
a plurality of cylindrical peripheral walls arranged in a plurality in a projecting direction from the base end on the trim side toward the tip on the door panel side, and having a narrower width in a direction orthogonal to the projecting direction as the peripheral wall is arranged closer to the tip side;
a plurality of connecting walls connecting edges of the adjacent peripheral walls to each other;
and an end wall that closes the end of the peripheral wall on the most tip side,
The peripheral wall includes a first peripheral wall, a second peripheral wall, and a third peripheral wall in order from the tip side,
The connecting wall includes a first connecting wall that connects the first peripheral wall and the second peripheral wall, and a second connecting wall that connects the second peripheral wall and the third peripheral wall,
each of the first peripheral wall, the second peripheral wall, and the third peripheral wall has a length equal to each other in the projecting direction;
The impact absorber, wherein the second peripheral wall and the third peripheral wall have equal volumes, and the first peripheral wall has a smaller volume than the second peripheral wall.

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