JP2004149076A - Shock absorbing body for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shock absorbing body for a vehicle having excellent shock absorbing property which eliminates variation of shock absorbing property caused by generation of resin reservoir in a joining surface part of a recessed rib. <P>SOLUTION: The shock absorbing body 1 for the vehicle is the one for absorbing the shock from the inside or the outside by internally providing it in the vehicle composition member. The shock absorbing body 1 for the vehicle is a thermoplastic resin made integrally molded by blow-molding. The shock absorbing body 1 for the vehicle has a mainbody 3 having a hollow part, and a pair of recessed ribs 6, 7 which recess an abutting surface 4 and a supporting surface 5 of the mainbody 3 to be opposed with each other toward the other side respectively, and join the respective tip parts. The tip parts of the recessed ribs 6, 7 are joined to make a joining part 8. An expansion part is formed in the joining part 8. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
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.
[0002]
[Prior art]
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.
[0003]
[Problems to be solved by the invention]
The impact absorbers for vehicles shown in the above Japanese Patent Laid-Open Nos. 2000-108826 and 2002-187508 are blow-molded, and concave ribs are formed from the front wall and the back wall, and the tip portions of the ribs are welded together. 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 absorption performance of a shock absorber falls, and a required impact collection effect cannot be acquired. FIG. 11 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.
[0004]
Therefore, the present invention absorbs the flow of resin caused by the pressing of the parison by forming the bulging portion by forming a certain bulging portion in advance in the joint portion of the concave rib with the pressing of the parison, Providing a vehicle shock absorber with excellent shock absorption by preventing resin from being pushed out to the outer periphery of the joint, eliminating variations in shock absorption caused by resin pooling at the joint of the concave ribs It is intended to do.
[0005]
[Means for Solving the Problems]
To achieve the above object, a vehicle shock absorber according to claim 1 of the present invention is a vehicle shock absorber for absorbing a shock from inside or outside by being installed in a vehicle component member. The shock absorber is made of a thermoplastic resin integrally formed by blow molding and has a hollow portion, and the abutting surface and the supporting surface of the main body that are opposed to each other are recessed toward the other, respectively. A pair of concave ribs formed by joining the tip portions is formed, and a bulging portion is formed at the joint portion where the tip portions of the pair of concave ribs are joined.
[0006]
A vehicle shock absorber according to claim 2 of the present invention is a vehicle shock absorber for absorbing a shock from inside or outside by being installed in a vehicle constituent member.
The shock absorber is made of a thermoplastic resin integrally molded by blow molding and has a hollow body, and a contact surface of the body is recessed toward the opposing support surface, and the tip is supported on the support surface. Or a concave rib in which the support surface is recessed toward the facing contact surface to join the tip to the contact surface, and the tip of the concave rib swells to the joint. A protruding portion is formed.
[0007]
According to a third aspect of the present invention, there is provided a vehicle shock absorber according to the first or second aspect, wherein a hollow portion is formed in a bulging portion formed at a joint portion where the tip end portions of the concave ribs are joined. It is characterized by being.
[0008]
According to a fourth aspect of the present invention, there is provided the vehicle impact absorber according to the first, second, or third aspect, wherein the bulging portion protrudes stepwise from the joint portion toward the contact surface or the support surface. The height is 0.5 to 1.5 mm in the axial direction of the concave rib.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
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 partial enlarged cross-sectional view showing another embodiment corresponding to FIG. 4, and FIG. 6 is a cross-sectional view showing a mode in which a vehicle shock absorber according to the present invention is installed in a door panel of a vehicle. 7 is a cross-sectional view showing a state in which the vehicle shock absorber according to the present invention is installed in the rear pillar of the automobile, and FIG. 8 is a rear view of the rear bumper in which the vehicle shock absorber according to the present invention is installed. . FIG. 9 is a partial cross-sectional view showing a blow-molded aspect of the vehicle impact absorber according to the present invention, and FIG. 10 is a partial cross-sectional view showing a form in which the same mold is closed and blow-molded.
[0010]
1 to 4, reference numeral 1 denotes a vehicle shock absorber. The vehicle impact absorber 1 is made of a thermoplastic resin integrally molded by blow molding, and both the abutting surface 4 and the support surface 5 of the main body 3 having the hollow portion 2 face each other. A large number of pairs of concave ribs 6 and 7 are formed, and the tip portions of the concave ribs 6 and 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.
[0011]
As shown in FIG. 5, the bulging portion 9 formed in the joint portion 8 of the concave ribs 6 and 7 can be formed by forming both end portions of the joint portion 8 into thick portions 11 and 11.
[0012]
The vehicle impact absorber 1 shown in FIGS. 1 to 4 is blow-molded as shown in FIGS. 9 and 10. 9 and 10, 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.
[0013]
As shown in FIG. 9, when a parison 16 is disposed between a pair of split molds 12 and 12, the mold is closed as shown in FIG. 10, and when a pressure fluid is blown into the parison 16 and blow-molded, a concave rib is formed. 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. In addition, the bulging part 8 which consists of the thick parts 11 and 11 shown in FIG. 5 can be formed by changing the position and shape of the bulging part forming part 15 of the concave ribs 14 and 14.
[0014]
Further, the bulging portion is formed to protrude from the joint portion toward the contact surface or the support surface, and the height thereof is in the range of 0.5 to 1.5 mm in the axial direction of the concave rib. It is possible to suitably prevent the resin pool from being generated on the outer periphery of the joint portion. Furthermore, by forming the hollow portion in the bulging portion, the thickness of the joint portion 8 can be formed uniformly, and an impact absorber having stable impact absorption can be formed.
[0015]
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.
[0016]
The vehicle impact absorber 1 according to the present invention is installed in a door of a car, a body side panel, a roof panel, a pillar, a bumper, and the like. FIG. 6 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. 7 in the rear pillar 20 of the automobile, and FIG. 8 in the rear bumper 21, respectively. In FIG. 7, A indicates the head of the passenger.
[0017]
【The invention's effect】
According to the present invention, by forming a certain bulging portion in the joint portion of the concave rib in advance, the resin flow generated by the pressing of the parison is absorbed by the formation of the bulging portion, and the resin is formed on the outer periphery of the joint portion. Can be prevented from being pushed out, the shock absorption variation due to the resin pooling occurring at the joint portion of the concave rib can be eliminated, and a vehicle shock absorber excellent in shock absorption can be obtained.
[Brief description of the drawings]
FIG. 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 cross-sectional view taken along line AA in FIG.
FIG. 4 is an enlarged sectional view of a part of the above.
FIG. 5 is a partial enlarged cross-sectional view showing another example corresponding to FIG. 4;
FIG. 6 is a cross-sectional view showing a mode in which a vehicle shock absorber according to the present invention is installed in a door of an automobile.
FIG. 7 is a cross-sectional view showing a mode in which a vehicle shock absorber according to the present invention is installed in a rear pillar of an automobile.
FIG. 8 is a rear view of a rear bumper in which a vehicle shock absorber according to the present invention is installed.
FIG. 9 is a partial cross-sectional view showing a blow molding aspect of the vehicle impact absorber according to the present invention.
FIG. 10 is a partial cross-sectional view showing an embodiment in which the mold is closed and blow-molded.
FIG. 11 is a cross-sectional view showing a part of a conventional vehicle shock absorber.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle shock absorber 2 Hollow part 3 Main body 4 Contact surface 5 Support surface 6,7 Concave rib 8 Joint part 9 Bulging part 10 Hollow part 11,11 Thick part 12,12 A pair of split molds 13,13 Cavity 14, 14 Concave rib forming portion 15 Bumped portion forming portion 16 Parison 17 Extrusion head 18 Door 19 Door trim 20 Rear pillar 21 Rear bumper A Head

Claims (4)

In a shock absorber for a vehicle for absorbing a shock from the inside or the outside by being installed in a vehicle component,
The shock absorber is made of a thermoplastic resin integrally formed by blow molding and has a hollow portion, and the abutting surface and the supporting surface of the main body that are opposed to each other are recessed toward the other, respectively. Forming a pair of concave ribs joined at the tip,
A vehicular shock absorber, wherein a bulging portion is formed at a joint portion where the tip portions of the pair of concave ribs are joined. In a shock absorber for a vehicle for absorbing a shock from the inside or the outside by being installed in a vehicle component,
The shock absorber is made of a thermoplastic resin integrally molded by blow molding and has a hollow body, and a contact surface of the body is recessed toward the opposing support surface, and the tip is supported on the support surface. Or forming a concave rib in which the support surface is recessed toward the facing contact surface and the tip is bonded to the contact surface.
An impact absorber for a vehicle, wherein a bulging portion is formed at a joint portion where the tip ends of the concave ribs are joined. 3. The vehicle impact absorber according to claim 1, wherein a hollow portion is formed in a bulging portion formed at a joint portion where the tip end portions of the concave ribs are joined. The bulge portion protrudes stepwise from the joint portion toward the contact surface or the support surface, and the height thereof is 0.5 to 1.5 mm in the axial direction of the concave rib. The impact absorber for vehicles according to 1, 2 or 3.

Images