JP2002029340A - Automobile bumper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bumper for an automobile excellent in absorptivity of shock from the outside and excellent in safety. SOLUTION: A bumper core 3 is interposed between the inside of a bumper fascia 2 and a body. The bumper core 3 is formed into hollow double wall structure by blow-molding it out of a thermoplastic resin, and is constituted of a molding 8 having hollow parts and having side walls 7 upright along the longitudinal direction of the bumper fascia 2, and a reinforcement molding 9 having high rigidity and high strength against load applied along the longitudinal direction of the bumper fascia 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bumper for an automobile having excellent shock absorbing properties against an external impact.

[0002]

2. Description of the Related Art Conventionally, as a bumper for an automobile, a rectangular tubular strength member comprising a shock absorbing member and front and rear channel members is interposed inside a bumper fascia.
What is described in -125649 is known.

[0003]

SUMMARY OF THE INVENTION The above-mentioned JP-A-3-125
No. 649, an automobile bumper has a structure in which a shock absorbing member and a strength member are arranged back and forth inside a bumper fascia, but the distance between the bumper fascia and the vehicle body is It is difficult to make the thickness of the shock absorbing member and the strength member in the front-rear direction sufficient for absorbing shock from the outside because it is narrow, especially when the bumper itself has a shallow curved shape like a rear bumper. It is.

Accordingly, the present invention provides a bumper core which is interposed between the inside of a bumper fascia and a vehicle body and absorbs an external impact, and has a hollow portion having a hollow double-walled structure obtained by blow molding a thermoplastic resin. By using multiple compacts, the rigidity and strength of the bumper fascia against the load and impact applied in the front-back direction are increased, and even if the bumper core is small in the front-rear direction, the bumper core has improved rigidity against shock and resilience during deformation. Even if the structure is such that only a bumper core with a small thickness in the front-rear direction can be interposed between the inside of the bumper fascia and the vehicle body, especially in the case of a rear bumper, even if it is a structure that can absorb external shocks and safety, It is intended to improve.

[0005]

To achieve the above object, a vehicle bumper according to a first aspect of the present invention is characterized in that impacts from the outside are interposed between right and left inner portions of a bumper fascia and a vehicle body. A bumper for an automobile, comprising a bumper core to be absorbed, wherein the bumper core is formed of a plurality of molded bodies having a hollow portion with a hollow double-walled structure obtained by blow molding a thermoplastic resin. It is assumed that.

According to a second aspect of the present invention, there is provided a vehicle bumper according to the first aspect, wherein the plurality of molded bodies constituting the bumper core have a molded body having a side wall standing upright in the front-rear direction. And a reinforcing molded body having high rigidity and strength against a load received in the front-rear direction of the bumper fascia.

According to a third aspect of the present invention, in the vehicle bumper according to the first or second aspect, the reinforcing molded body constituting the bumper core has a rectangular double-walled rectangular panel shape. The panel is characterized in that a concave groove rib extending from one long side end face to the other long side end face is formed on one side wall or both side walls of the panel.

According to a fourth aspect of the present invention, there is provided a bumper for an automobile according to the second aspect, wherein the reinforcing molded body has a bumper core such that one long side end face thereof corresponds to the inside of the bumper fascia. It is characterized by being engaged with a molded body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings illustrate a rear bumper as an automobile bumper according to an embodiment of the present invention. 1 is an overall perspective view of the rear bumper viewed from the inside, FIG. 2 is an overall perspective view of the bumper core, FIG. 3 is an exploded perspective view of the bumper core, and FIG. 4 is a cross-sectional view taken along line XX of FIG. FIG. 5 is a sectional view taken along line YY of FIG.

In FIG. 1, reference numeral 1 denotes a rear bumper. The rear bumper 1 includes a bumper fascia 2 and bumper cores 3, 3 which are interposed between the bumper fascia 2 and the vehicle body to absorb external impacts. The bumper cores 3, 3 are composed of a plurality of molded bodies, that is, a hollow molded body 8 and a reinforcing molded body 9, as described later. Both side portions of the bumper fascia 2 are formed in a curved shape along the side surface of the vehicle body, and the inside of the curved portions 4, 4 are respectively provided with fixing portions 5 to the vehicle body. The bumper fascia 2 is made of resin.

As shown in detail in FIGS. 2 to 5, the right bumper core 3 as viewed from the inside of the bumper fascia 2 is shown in FIG.
Is a hollow hollow molded body 8 having a hollow portion 6 in a hollow double-wall structure obtained by blow molding a thermoplastic resin and having a side wall 7 standing upright in the front-rear direction of the bumper fascia 2.
And the reinforcing molded body 9, and the reinforcing molded body 9 is engaged with the molded body 8 to form the integral bumper core 3.

The molded body 8 constituting the bumper core 3 has a concave rib 1 for connecting a front wall 10 corresponding to the inside of the bumper fascia 2 and a rear wall 11 corresponding to the vehicle body (not shown).
Two. The concave ribs 12 are formed from the front wall 10 and the rear wall 11, respectively, and are welded to each other in the hollow portion 6 to be integrated, and 13 is a welded plate-like portion. The concave rib 12 is circular, but it may be oval. Also, the reinforcing molded body 9 constituting the bumper core 3
Has a structure having high rigidity and strength against the load received in the front-rear direction of the bumper fascia 2. The reinforcing molded body 9 is engaged with the molded body 8 so as to extend inward of the bumper fascia 2. ing.

That is, the reinforcing molded body 9 constituting the bumper core 3 has a hollow double-walled structure and has a rectangular panel shape, and the panel double-sided walls 14 and 15 have one long side end face 16 to the other. Groove ribs 18, 1 over the long side end face 17
The reinforcing molded body 9 has a bellows shape on both sides. One long side end face 16 of each concave groove 18
A hollow communication portion 19 that is rib-shaped with respect to the longitudinal direction is formed at a substantially intermediate portion between the first and second long side end surfaces 17.

The molded body 8 forming the bumper core 3 includes:
An engagement groove 20 is formed on an inner end surface thereof, and an engagement protrusion 21 which engages with and disengages from the engagement groove 20 is formed on one short side end of the reinforcing molded body 9. The reinforcing molded body 9 is engaged with the molded body 8 by the groove 20 and the engaging projection 21 so that the two are integrated, and the reinforcing molded body 9 has one long side end face 16. Bumper fascia 2
Is engaged with the molded body 8 so as to correspond to the inside.

The bumper core 3 on the left side when viewed from the inside of the bumper fascia 2 has the same structure as the bumper core 3 on the right side, except that the shape is symmetrical. The bumper cores 3, 3
It is attached to the inside of the bumper fascia 2 by means such as temporary attachment by adhesion or adhesion.

The bumper cores 3, 3 have a flexural modulus of 10
000 Kg / cm ^{2 to} 40000 Kg / cm ² of a thermoplastic resin, and the entire average thickness is 0.5 mm to
4.0 mm, and the product of the flexural modulus and the average thickness is 100
It is 0 kg / cm to 10000 kg / cm. The flexural modulus is based on JIS K7113, using No. 2 test piece,
It is a numerical value measured at a pulling speed of 2 mm / min.

As the thermoplastic resin constituting the bumper cores 3, 3, high-density polyethylene resin, polypropylene resin, polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polycarbonate resin, acrylonitrile / butadiene / styrene resin ( ABS resin), acrylonitrile / styrene resin (A
S resin), acrylonitrile / acryl rubber / styrene copolymer (AAS resin), polyphenylene ether resin (PPO resin), or a blend thereof.

In a rear bumper 1 according to an embodiment of the present invention, bumper cores 3 and 3 which are interposed between a bumper fascia 2 and a vehicle body to absorb an external impact are mounted on left and right portions of the bumper fascia 2, respectively. And bumper cores 3,3
Is a hollow hollow molded body 8 having a hollow portion 6 in a hollow double-wall structure obtained by blow molding a thermoplastic resin and having a side wall 7 standing upright in the front-rear direction of the bumper fascia 2.
And a reinforcing molded body 9 having high rigidity and strength against a load received in the front-rear direction of the bumper fascia 2. The reinforcing molded body 9 is engaged with the molded body 8 so as to extend inward of the bumper fascia 2. Therefore, the rigidity and strength of the bumper fascia 2 against the load and impact applied in the front-rear direction are extremely large. For this reason, the bumper cores 3 and 3 have excellent rigidity against impact and resilience at the time of deformation even if the thickness in the front-rear direction is small, and, like a rear bumper, are located between the inside of the bumper fascia 2 and the vehicle body. Even with a structure in which only a bumper core having a small thickness in the front-rear direction can be interposed, it is possible to improve external shock absorption and safety.

[0019] Then, the bumper core 3,3 is flexural modulus is constituted by a thermoplastic resin ^{10000Kg / cm 2 ~40000Kg / cm 2} , the average thickness of the entire 0.5m
m to 4.0 mm, the product of flexural modulus and average thickness is 1000
By setting Kg / cm to 10000 Kg / cm, the rigidity against impact and the resilience at the time of deformation become excellent, and the concave rib 12 connecting the front wall 10 and the rear wall 11 of the bumper cores 3, 3 is formed. With such a structure, the rigidity against impact and the resilience during deformation are further improved.

In the rear bumper 1 according to the embodiment of the present invention, the bumper cores 3 are formed by the molded body 8 having the side walls 7 erected in the front-rear direction of the bumper fascia 2 and the reinforcing molded body 9. However, the present invention is not limited to such a configuration, and requires that the bumper core be composed of a plurality of molded bodies. For example, a plurality of molded bodies 8 as in the embodiment may be arranged, or the molded bodies 8 may be sequentially connected and integrated. In a configuration in which a plurality of molded bodies 8 are arranged side by side, it is preferable that the molded bodies 8 be provided corresponding to the impact focus of the bumper fascia 2. In the configuration in which the plurality of molded bodies 8 are connected, appropriate connecting means such as adhesion and screwing can be implemented in addition to fitting of unevenness.

[0021]

According to the present invention, the bumper core interposed between the inside of the bumper fascia and the vehicle body and absorbing an external impact is formed by a hollow double-walled structure formed by blow molding a thermoplastic resin. By increasing the rigidity and strength of the bumper fascia against the load and impact applied in the front-rear direction, the rigidity and shock recovery even when the bumper core has a small thickness in the front-rear direction. Even if it has a structure in which only a small bumper core in the front-rear direction can be interposed between the inside of the bumper fascia and the vehicle body, such as a rear bumper, it can absorb shocks from outside and provide safety. Performance can be improved.

[Brief description of the drawings]

FIG. 1 is an overall perspective view illustrating a rear bumper as an example of a vehicle bumper according to the present invention, as viewed from the inside.

FIG. 2 is an overall perspective view of a bumper core.

FIG. 3 is an exploded perspective view of a bumper core.

FIG. 4 is a sectional view taken along line XX of FIG. 2;

FIG. 5 is a sectional view taken along line YY of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rear bumper 2 Bumper fascia 3,3 Bumper core 4,4 Curved part 5 Fixing part 6 Hollow part 7 Side wall 8 Molded body 9 Reinforced molded body 10 Surface wall 11 Back wall 12 Concave rib 13 Welding plate part 14,15 Both sides of panel Wall 16 One long side end face 17 The other long side end face 18, 18 Concave groove rib 19 Plate portion 20 Engagement groove 21 Engagement protrusion

Claims (4)

[Claims] 1. The left and right portions inside a bumper fascia,
A bumper for an automobile, which is provided with a bumper core interposed between a vehicle body and absorbing an external impact, wherein the bumper core has a hollow double-walled structure formed by blow molding a thermoplastic resin. An automobile bumper comprising a plurality of molded bodies having the same. 2. A molded article comprising a bumper core, the molded article having a side wall standing upright in the front-back direction;
2. A bumper for an automobile according to claim 1, wherein said bumper is formed of a reinforcing molded body having high rigidity and strength against a load received in a front-rear direction of the bumper fascia. 3. The reinforcing molded body constituting the bumper core,
The hollow double-walled structure has a rectangular panel shape, and a concave groove rib extending from one long side end face to the other long side end face is formed on one side wall or both side walls of the panel. 3. The bumper for an automobile according to 1 or 2. 4. The automobile according to claim 3, wherein the reinforcing molded body is engaged with the molded body constituting the bumper core such that one long side end face thereof corresponds to the inside of the bumper fascia. Bumper.