JP2007239979A - Shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shock absorber composed of a blow molded product of a thermoplastic resin, which can reduce an influence of a shock on a human body with a wide shock-responding range and is not degraded in shock absorbing performance even to an oblique shock. <P>SOLUTION: A truncated conical recessed rib 5 recessed toward a front wall 2 is formed on a rear wall 3. The tip of the recessed rib 5 reaches the vicinity of the front wall 2, and a receiving part for the recessed rib 5 is formed on the front wall 2. The receiving part is an annular recessed part 6 recessed toward the front wall, and the recessed part 6 is disposed around the tip of the recessed rib 5. The tip 6a of the recessed part 6 is formed in a depth substantially equal to or larger than the height of the tip 5a of the recessed rib 5. The blow molded product is desirably sealed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention comprises a hollow blow-molded body, is installed in a passenger compartment panel of an automobile, a construction machine, an agricultural machine, etc., and absorbs the collision energy against an external collision to protect the occupant About.

Patent Documents 1 and 2 describe a shock absorber made of a hollow blow-molded body. In the shock absorber described in Patent Document 1, a concave rib reaching the other wall is formed on one wall of the front and rear walls (abutment surface and support surface) facing each other, and the tip is formed on the inner surface of the other wall. In this case, a concave rib is formed on each of the abutting and welding surfaces and the front and rear walls (abutting surface and supporting surface) facing each other, and the tips of the concave ribs are abutted and welded to each other.
The shock absorber described in Patent Document 2 forms a concave rib that reaches the other wall and a concave rib that does not reach the other wall on one wall of the opposing front and rear walls (contact surface and support surface), A plurality of pairs of concave ribs are formed facing each other on the concave rib reaching the other wall, the tip of which is in contact with and welded to the inner surface of the other wall, and the opposing front and rear walls (contact surface and support surface). The tips of the concave ribs facing each other are brought into contact with each other and welded, and the remaining tips are not brought into contact with each other.

Japanese Patent No. 33133999 JP 2004-314647 A

The shock absorber made of a thermoplastic resin blow-molded body can change the average wall thickness by changing the blow molding conditions, and can change the shock-absorbing performance. Therefore, although the average thickness of the shock absorber is determined according to the assumed impact, in the case of the shock absorber described in Patent Document 1, the walls facing the tips of the concave ribs or the tips of the concave ribs facing each other Are in contact and welded, the impact width that the shock absorber can handle is small. For example, an impact absorber manufactured on the assumption of a strong impact is not deformed to a small impact and cannot exhibit impact absorbing performance.
On the other hand, in the case of the shock absorber described in Patent Document 2, a large number of concave ribs are formed, and the walls facing the tips of some of the concave ribs or the tips of the facing concave ribs are not in contact with or welded to each other. Therefore, the range of impacts that can be absorbed and dealt with in two stages is widened. However, when an impact is applied obliquely, the tip of the concave rib that is not in contact with or welded to the other wall or the tip of the concave rib slips. Will not be able to exhibit sufficient shock absorbing performance.
It is an object of the present invention to increase the width of a shock that can be accommodated with respect to an impact absorber made of a blow molded body of a thermoplastic resin, and to prevent the impact absorption performance from deteriorating against an oblique impact.

  The shock absorber according to the present invention comprises a hollow blow-molded body having front and rear walls facing each other at a predetermined interval, and a concave rib recessed toward the other wall is formed on one wall of the front and rear walls. The tip of the concave rib reaches the vicinity of the other wall, the receiving portion of the concave rib is formed on the other wall, and the receiving portion is a concave portion that is recessed toward the one wall. Is arranged around the tip of the concave rib, and is formed substantially equal to or deeper than the height of the tip of the concave rib.

  The shock absorber according to the present invention comprises a hollow blow-molded body having front and rear walls facing each other at a predetermined interval, and is a first concave rib recessed in one wall of the front and rear walls toward the other wall. And the second wall is formed with a second concave rib recessed toward the one wall, the first concave rib and the second concave rib face each other, and the tip of the first concave rib Reaches the vicinity of the tip of the second concave rib, a receiving portion of the first concave rib is formed around the tip of the second concave rib, and the receiving portion is further recessed toward the one wall It is a recessed part, The said recessed part is arrange | positioned around the front-end | tip of the said 1st concave rib, and is substantially the same as the height of the front-end | tip of the said 1st concave rib, It is characterized by the above-mentioned.

In the shock absorber, the recess is preferably annular.
Further, the blow molded body is desirably sealed inside, and in that case, the blow molded body preferably has a nozzle formed integrally with an air blowing port, and the nozzle is preferably closed by welding. .
In the present invention, the front and rear walls mean walls that are disposed at front and rear positions in the assumed direction of impact.

According to the present invention, at the time of an impact, the side wall of the blow molded body first receives the impact, and if the impact is small, the impact is absorbed only by the side wall. Since the contact with the concave rib contributes to the impact absorption, the width of the impact that can be dealt with increases. Further, by absorbing the impact in two steps, the influence of the impact on the human body can be reduced.
In the present invention, since the receiving portion having a specific structure that receives the tip of the concave rib is formed on the opposing wall or the opposing concave rib, the concave rib and the opposing wall or the opposing concave rib are laterally displaced even from an oblique impact. It does not occur, and it is not necessary to reduce the shock absorption performance.
In the present invention, when the blow molded body is sealed, it is possible to prevent air from coming out of the blow molded body at the time of impact. As a result, an air cushion action by the air enclosed inside is added, and the impact absorption performance is improved.

Hereinafter, the shock absorber according to the present invention will be described in detail with reference to FIGS.
The shock absorber 1 shown in FIG. 1 is a blow molded body of thermoplastic resin, and has a flat front wall 2 and a rear wall 3 that face each other at a predetermined interval, and a periphery substantially perpendicular to the front and rear walls 2 and 3. It is a hollow body having a substantially rectangular parallelepiped shape made of the side wall 4. A concave rib 5 having a substantially frustoconical shape recessed toward the front wall 2 is formed on the rear wall 3, and the tip of the concave rib 5 reaches the vicinity of the front wall 2, and the front wall 2 receives the concave rib 5. The part is formed. What is necessary is just to set the clearance gap between the front-end | tip of the concave rib 5 and the front wall 2 suitably. The receiving portion includes an annular recess 6 that is recessed toward the rear wall 3. The recess 6 is disposed in the vicinity of the periphery of the tip of the concave rib 5, and the tip 6 a of the recess 6 corresponds to the tip 5 a of the concave rib 5. It is formed deeper than the height (so as to be located on the rear wall 3 side). It should be noted that there is no problem even if the tip 6a of the recess 6 is substantially the same height as the tip 5a of the concave rib 5.

The shock absorber 1 is installed with the front wall 2 facing the shock receiving side and the rear wall 3 facing the shock supporting side (occupant compartment side). At the time of impact, the front wall 2 is impacted, and the side wall 4 first receives the impact load. If the impact is large, the side wall 4 is deformed, the front wall 2 is retracted and comes into contact with the concave rib 5, and thereafter the concave rib 5 contributes to shock absorption. At this time, since the tip of the concave rib 5 enters the inner peripheral portion 6b of the annular recess 6 and comes into contact with the front wall 2, even if an impact is applied obliquely, the tip of the concave rib 5 is The concave rib 5 does not deviate from the inner peripheral portion 17b, and receives an impact load without the lateral displacement of its tip.
In this example, the concave rib 5 is formed on the rear wall 3 (impact support side) and the receiving portion (recess 6) is formed on the front wall 2 (impact receiving side), but this may be reversed.
Moreover, although the continuous annular recessed part 6 was formed as a receiving part, a receiving part can also be comprised by a some discontinuous recessed part.

  The shock absorber 11 shown in FIG. 2 is also a blow molded body of thermoplastic resin, and is substantially perpendicular to the flat front wall 12 and the rear wall 13 and the front and rear walls 12 and 13 facing each other at a predetermined interval. This is a hollow body having a substantially rectangular parallelepiped shape composed of the side wall 14. A concave rib 15 (first concave rib) having a substantially frustoconical shape recessed toward the rear wall 13 is formed on the front wall 12, and the front wall has a larger tip diameter than the concave rib 15. A concave rib 16 (second concave rib) having a substantially frustoconical shape recessed toward 13 is formed. The tip of the concave rib 15 and the tip of the concave rib 16 are close to each other, and a receiving portion for the concave rib 15 is formed around the tip of the concave rib 16. What is necessary is just to set the clearance gap between the front-end | tip of the concave rib 15 and the front-end | tip of the concave rib 16 suitably. The receiving portion includes an annular recess 17 that is further recessed from the tip of the concave rib 16 toward the front wall 12 side. The recess 17 is disposed in the vicinity of the periphery of the tip of the concave rib 15, and the tip 17a of the recess 17 is The concave rib 15 is formed deeper than the tip 15a (so as to be located on the front wall 12 side). It should be noted that there is no problem even if the tip 17a of the recess 17 is substantially the same height as the tip 15a of the concave rib 15.

The shock absorber 11 is installed with the front wall 12 facing the shock receiving side and the rear wall 13 facing the shock supporting side. At the time of impact, the front wall 12 is impacted, and the side wall 14 first receives the impact load. If the impact is large, the side wall 14 is deformed, the front wall 12 is retracted, the concave rib 15 comes into contact with the tip of the concave rib 16, and thereafter the concave ribs 15 and 16 contribute to shock absorption. At this time, since the tip of the concave rib 15 enters the inner peripheral portion 17b of the annular recess 17 and comes into contact with the tip of the concave rib 16, even if an impact is applied obliquely, the tip of the concave rib 15 is an annular recess. 17 does not disengage from the inner peripheral portion 17b, and the tips of the concave ribs 15 and 16 receive an impact load without being laterally displaced.
In this example, a receiving portion (concave portion 17) is formed on the concave rib 16 formed on the rear wall 13 (impact support side), and the tip of the concave rib 15 formed on the front wall 12 (impact receiving side) is formed. Although it was supported by the receiving part, conversely, the receiving part may be formed as a concave rib on the front wall side, and the tip of the concave rib formed on the rear wall side may be supported by the receiving part.
Moreover, although the continuous annular recessed part 17 was formed as a receiving part, a receiving part can also be comprised by a some discontinuous recessed part.

3-5 is a figure explaining the air blowing inlet of a blow molded body about shock absorbers 11A-11C (the basic shape is the same as the shock absorber 11).
In many cases, the air blowing port is set on the parting line of the blow molded body. In this case, a nozzle-shaped portion is formed as a part of the burr in the air blowing port. Since all burrs formed on the parting line are usually cut off, the air blowing port remains as a simple hole on the parting line of the blow molded body. The shock absorber 11A shown in FIG. 3 shows this, and the hole 21 is a trace of the air blowing port.
On the other hand, when the burr is cut off, a nozzle-shaped portion can be left. The shock absorber 11B shown in FIG. 4 shows this, and a nozzle 22 as an air blowing port is integrally formed. In FIG. 4, the dies 23 and 24 and the air blowing needle 25 are indicated by phantom lines. A nozzle 22 is formed between the molds 23 and 24 and the air blowing needle 25.
The shock absorber 11C shown in FIG. 5 is further sealed by blocking the nozzle 22 so that the air inside the blow molded body does not escape. In the example of FIG. 5, the nozzle 22 is pressed and welded with a heated jig, but this method is superior in adhesive strength and productivity as compared to the case where the nozzle 22 is closed using an adhesive tape or adhesive. However, the sealing means of the blow molded body is not limited to welding.

In the above description, one concave rib is provided on either of the front and rear walls, or a pair of front and rear walls is provided. However, the number of concave ribs or the number of pairs of concave ribs may be plural. In that case, it is arbitrary for each concave rib which of the front and rear walls is provided with the receiving portion or which of the pair of concave ribs formed on the front and rear walls is provided.
Moreover, although the shape of the concave rib was a truncated cone, other shapes such as a truncated pyramid may be used.

It is sectional drawing (a) and the top view (b) of the shock absorber which concerns on this invention. It is sectional drawing (a) and another top view (b) of another shock absorber which concerns on this invention. It is sectional drawing which passes along the blowing inlet of the shock absorber which concerns on this invention. It is sectional drawing which passes along the blowing inlet of the shock absorber which concerns on this invention. It is sectional drawing which passes along the blowing inlet of the shock absorber which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Shock absorber 2,12 Front wall 3,13 Rear wall 4,14 Side wall 5,15,16 Concave rib 6,17 Concave part (receiving part)
21 Hole in the inlet 22 Nozzle in the inlet

Claims (5)

A hollow blow-molded body having front and rear walls facing each other at a predetermined interval, a concave rib recessed toward the other wall is formed on one wall of the front and rear walls, and a tip of the concave rib is formed on the other side The concave rib is formed on the other wall, the concave portion is recessed toward the one wall, and the concave portion is formed around the tip of the concave rib. The shock absorber is arranged and formed substantially the same as or deeper than the height of the tip of the concave rib. A hollow blow-molded body having front and rear walls facing each other at a predetermined interval, a first concave rib recessed toward the other wall is formed on one wall of the front and rear walls, and the other wall A second concave rib recessed toward one wall is formed, the first concave rib and the second concave rib face each other, and the tip of the first concave rib is in the vicinity of the tip of the second concave rib. A receiving portion of the first concave rib is formed around the tip of the second concave rib, the receiving portion being a concave portion further recessed toward the one wall, and the concave portion is the first concave shape. An impact absorber, wherein the shock absorber is disposed around the tip of the rib and is substantially the same as or deeper than the height of the tip of the first concave rib. The impact absorber according to claim 1 or 2, wherein the recess is annular. The shock absorber according to any one of claims 1 to 3, wherein the blow molded body is sealed inside. 5. The shock absorber according to claim 4, wherein the blow molded body has a nozzle integrally formed in an air blowing port, and the nozzle is closed by welding.

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