JP2009012765A - Vehicular shock absorber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular shock absorber which eliminates fluctuation of shock absorption property due to a resin pool generated in a connected portion of a recessed rib and has a superior shock absorbing property. <P>SOLUTION: The vehicular shock absorber body 1 is the one for absorbing the shock from the inside or the outside by internally providing it in the vehicle composition member. The shock absorber 1 is made of thermoplastic resin and integrally molded by blow-molding. The vehicular shock absorber 1 includes a main body 3 having a hollow part and a pair of recessed ribs 6, 7 which connect each front end of surfaces 4, 5 of the main body 3 opposed to each other and dented toward each other. An inflated part having a hollow part is formed in the connected portion 8 depressed between front ends of the recessed ribs 6, 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention absorbs an external impact such as a collision with a vehicle or other vehicle by causing a passenger to collide with an inner wall of the vehicle component by being installed in a vehicle component such as a door or a body side panel. The present invention relates to a vehicle impact absorber.

As a shock absorber for this type of vehicle, a thermoplastic resin is blow-molded to have a hollow portion with a hollow double wall structure, and concave ribs are formed from the front and back walls to join the tip portions of each other. And the like, which are intended to improve impact absorption, are described in Japanese Patent Application Laid-Open Nos. 2000-108826 and 2002-187508.
JP 2000-108826 A Japanese Patent Laid-Open No. 2002-187508

  The above-mentioned shock absorbers for vehicles shown in JP-A-2000-108826 and JP-A-2002-187508 are blow-molded, formed with concave ribs from the front wall and the back wall, and welded to each other at their front ends. The joint is formed by pressing the molten parison with a mold, so that the molten resin is pushed out on the outer periphery of the joint and a resin pool occurs. And a notch part is formed by this, or the thickness of a concave rib becomes non-uniform | heterogenous, the impact-absorbing performance of an impact-absorbing body falls, and a required impact collection effect cannot be acquired. FIG. 10 exemplifies such an embodiment, in which a and b are concave ribs, c is a joint, and a resin reservoir d bulging to the outside is generated in the joint c.

  Therefore, the present invention forms a bulging portion having a hollow portion in the joint portion of the concave rib with the pressing of the parison so that the resin flow generated with the pressing of the parison can be caused to flow in the bulging portion having the hollow portion. Absorbs by forming, prevents the resin from being pushed out to the outer periphery of the joint, eliminates the shock-absorbing variation caused by the resin pool in the joint of the concave rib, and has excellent shock-absorbing properties The object is to provide a shock absorber.

  In order to achieve the above object, a vehicle shock absorber according to claim 1 of the present invention is a vehicle shock absorber provided in a vehicle component, wherein the shock absorber is integrally formed by blow molding. A main body made of a thermoplastic resin and having a hollow portion, and a concave rib forming a pair in which the one surface and the other surface of the main body facing each other are recessed in the facing direction and the tip portions are joined to each other The bulging part which has a hollow part is formed in the junction part which the front-end | tip part of the concave rib which makes a pair was pressed and joined.

  According to a second aspect of the present invention, there is provided a vehicle impact absorber according to a second aspect of the present invention, wherein the impact absorber is made of a thermoplastic resin integrally formed by blow molding. A main body having a hollow portion and one surface of the main body is recessed toward the other surface facing the other, and the tip is joined to the other surface, or the other surface is directed toward the one surface facing the other. And forming a concave rib with the tip portion joined to the abutment surface and forming a bulging portion having a hollow portion at the joint portion where the tip portion of the concave rib is pressed and joined. To do.

  According to the present invention, by forming the bulging portion having the hollow portion at the joint portion of the concave rib, the flow of the resin generated by the pressing of the parison is absorbed by the formation of the bulging portion, and the outer periphery of the joint portion is absorbed. It is possible to prevent the resin from being pushed out, eliminate the shock-absorbing variation caused by the resin pool at the joint portion of the concave rib, and obtain a vehicle shock absorber excellent in shock-absorbing property.

  1 is a perspective view of a vehicle shock absorber according to an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2, and FIG. FIG. 5 is a sectional view showing a mode in which the vehicle shock absorber according to the present invention is installed in a door panel of a vehicle, and FIG. 6 is a mode in which the vehicle shock absorber according to the present invention is installed in a rear pillar of an automobile. FIG. 7 is a rear view of a rear bumper in which a vehicle shock absorber according to the present invention is installed. FIG. 8 is a partial cross-sectional view showing a blow-molded aspect of the vehicle impact absorber according to the present invention, and FIG. 9 is a partial cross-sectional view showing a form in which the mold is closed and blow-molded.

  1 to 4, reference numeral 1 denotes a vehicle shock absorber. This vehicle impact absorber 1 is made of a thermoplastic resin integrally molded by blow molding, and both the one surface 4 and the other surface 5 of the body 3 having the hollow portion 2 are opposed to each other. A large number of pairs of concave ribs 6, 7 are formed so as to be recessed toward each other, and the tip portions of the concave ribs 6, 7 are in contact with each other to form a joint 8. A bulging portion 9 is formed integrally with the joint portion 8, and a hollow portion 10 is formed in the bulging portion 9.

  The vehicle impact absorber 1 shown in FIGS. 1 to 4 is blow-molded as shown in FIGS. 8 and 9, reference numerals 12 and 12 denote a pair of split molds, reference numerals 13 and 13 denote cavities, and reference numerals 14 and 14 denote concave rib forming portions. One of the concave rib forming portions 14, 14 has a bulging portion forming portion 15. 16 is a parison and 17 is an extrusion head.

  As shown in FIG. 8, when a parison 16 is disposed between a pair of split molds 12 and 12, the mold is closed as shown in FIG. 9, and a pressure fluid is blown into the parison 16 and blow molding is performed, thereby forming a concave rib. In the joining portion 8 formed by being pressed by the tip surfaces of the portions 14, 14, the resin to be pressed flows into the bulging portion forming portion 15, and the bulging portion 9 is formed. And since the resin which is pressed and flows by the tip surfaces of the concave rib forming portions 14 and 14 flows into the bulging portion forming portion 15 as described above, the resin can be prevented from escaping to the outer periphery of the joint portion 8. In addition, a resin pool does not occur on the outer periphery of the joint 8, and the thickness of the joint 8 does not vary. And by forming the hollow part 10 in the bulging part 9, the thickness of the junction part 8 can be shape | molded uniformly, and the shock absorber which has the stable shock absorption property can be formed.

  The thermoplastic resin constituting the vehicle impact absorber 1 according to the present invention includes high-density polyethylene resin, polypropylene resin, polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polycarbonate resin, acrylonitrile / butadiene / styrene. Examples thereof include a resin (ABS resin), an acrylonitrile / styrene resin (AS resin), an acrylonitrile / acrylic rubber / styrene copolymer (AAS resin), a polyphenylene ether resin (PPO resin), or a blend thereof.

  The vehicle impact absorber 1 according to the present invention is installed in a door, a body side panel, a roof panel, a pillar, a bumper, or the like of an automobile. FIG. 5 shows an example in which the vehicle shock absorber 1 according to the present invention is installed in the door trim 19 of the door 18, FIG. 6 in the rear pillar 20 of the automobile, and FIG. 7 in the rear bumper 21. In FIG. 6, A indicates the head of the passenger.

1 is a perspective view of a vehicle shock absorber according to an embodiment of the present invention. It is a top view same as the above. It is an AA line expanded sectional view of FIG. It is a partial expanded sectional view same as the above. It is sectional drawing which shows the aspect which installed the shock absorber for vehicles which concerns on this invention in the door of the motor vehicle. It is sectional drawing which shows the aspect which installed the shock absorber for vehicles which concerns on this invention in the rear pillar of a motor vehicle. It is a rear view of the rear bumper which installed the shock absorber for vehicles concerning the present invention. It is a partial sectional view showing a blow molding aspect of a shock absorber for vehicles according to the present invention. It is a partial cross section figure which shows the aspect closed and blow-molded same as the above. It is sectional drawing which shows a part of conventional impact absorber for vehicles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle shock absorber 2 Hollow part 3 Main body 4 One side 5 The other side 6,7 Concave rib 8 Joint part 9 Expansion part 10 Hollow part 12,12 Pair of split molds 13,13 Cavity 14,14 Concave shape Rib forming part 15 bulging part forming part 16 parison 17 extrusion head 18 door 19 door trim 20 rear pillar 21 rear bumper A head

Claims (2)

In a shock absorber for a vehicle installed in a vehicle component,
The shock absorber is made of a thermoplastic resin integrally formed by blow molding and has a hollow body, and one surface and the other surface of the body facing each other are recessed in the facing direction. Forming a pair of concave ribs joined to each other's tip,
An impact absorber for a vehicle, wherein a bulging portion having a hollow portion is formed at a joint portion where the tip end portions of the pair of concave ribs are pressed and joined. In a shock absorber for a vehicle installed in a vehicle component,
The shock absorber is made of a thermoplastic resin integrally formed by blow molding and has a hollow body, and one surface of the body is recessed toward the other surface facing the other, and the tip is moved to the other. To form a concave rib in which the other surface is recessed toward one of the opposing surfaces and the tip is bonded to the contact surface,
An impact absorber for a vehicle, wherein a bulging portion having a hollow portion is formed at a joint portion where the tip end portion of the concave rib is pressed and joined.

Images