JPH07137587A - Bumper supporting device - Google Patents

Abstract

PURPOSE:To set the amount of the buckling load at the bumper supporting stay of a vehicle easily. CONSTITUTION:In a stay main body 10 extending forward being installed to the end of a vehicle side member 13, and supporting a bumper beam 14 at the front end, a fiber reinforced resin layer 17 is superposed and adhered to incline the reinforcement fibers largely in the opposite directions each other to the axial direction of the stay main body 10, at the B zone at the center, while a fiber reinforced resin layer 18 is superposed and adhered to incline the reinforcement fibers small in the opposite directions each other to the axial direction of the stay main body, at the C zone at the rear side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supporting a bumper of a vehicle, and more particularly to a bumper supporting device capable of easily setting the magnitude of the buckling load when the vehicle collides.

[0002]

2. Description of the Related Art In a conventional vehicle, as illustrated in FIG. 9, a stay 2 is fixed to an end portion of a front side member or a rear side member 1 by bolts or the like so as to extend in the front-rear direction of the vehicle. Bumper beam or bumper ring hosement 3 extending in the vehicle width direction is stay 2
When the vehicle collides at a relatively low speed, the stay 2 buckles and deforms in a bellows shape so that the side member 1 and the body connected thereto are not damaged. However, it is difficult to set an appropriate buckling load on the stay 2 in a stable manner.
A lot of man-hours are required to determine the shape of the stay 2.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to easily set the magnitude of buckling load for a stay that is attached to a side member end of a vehicle and supports a bumper beam or the like. To be able to do it.

[0004]

Therefore, the bumper support device according to the present invention is a stay main body which is attached to an end portion of a side member of a vehicle and extends in the front-rear direction of the vehicle to support a bumper beam and the like. It has a fiber reinforced resin layer adhered to the surface.

[0005]

Therefore, when the fiber reinforced resin layer is bonded to the surface of the stay body extending in the front-rear direction of the vehicle, the size of the bonding area, the content ratio of the reinforcing fiber in the resin layer, the orientation angle, or the like, or the bonding is performed. By changing the number of resin layers, etc., or by appropriately changing or combining them in the vehicle front-rear direction, the size of the buckling load of the stay main body in the vehicle front-rear direction can be easily set or controlled stepwise. can do.

[0006]

Embodiments of the present invention will be described below by assigning the same reference numerals to the same parts. 1 and 2,
Flanges 11 and 12 are fixed to both ends of a stay main body 10 made of a steel pipe having a circular cross section, a flange 11 is provided at an end of a front side member or a rear side member 13 extending in the front-rear direction of the vehicle, and a bumper beam 14 extending in the vehicle width direction is provided. The stay main body 10 is attached to each of 12 by unillustrated bolts or welding, and is arranged so as to extend in the front-rear direction of the vehicle.

Of the outer surface of the stay body 10, about 1 in front of
Assuming that / 3 is the A area, about 1/3 of the center is the B area, and about 1/3 of the rear is the C area, no processing is applied to the A area, but carbon fiber, glass fiber, aramid The fiber-reinforced resin layer 15 having a fiber content rate of 60% is formed in a film shape having a thickness of 0.15 mm by the epoxy resin in which reinforcing fibers such as fibers are arranged in a certain direction. It is wound and adhered by a film adhesive, and at this time, the inclination angle of the reinforcing fibers with respect to the axial direction of the stay body 10, that is, the fiber orientation angle is 75 °.

Next, in the area C of the outer surface of the fiber reinforced resin layer 15, a structure equivalent to that of the fiber reinforced resin layer 15 is provided, and the reinforced fibers are 15 ° in the opposite direction to the axial direction of the stay body 10. The fiber reinforced resin layer 16 is wound once and is adhered by a film adhesive so that the fiber orientation angle is −15 °, and the fiber reinforced resin layers 15 and C in the area B are inclined. The outer surface of the fiber reinforced resin layer 16 in the area has a structure similar to that of the fiber reinforced resin layer 15, and the reinforcing fibers are inclined by 75 ° in the opposite direction with respect to the axial direction of the stay main body 10. So as to be −75 °, the fiber reinforced resin layer 17 is wound around once and adhered by a film adhesive, and further, in the C region of the outer surface of the fiber reinforced resin layer 17, the fiber reinforced resin layer 15 Equivalent to With the structure, the reinforcing fibers are inclined by 15 ° in the same direction with respect to the axial direction of the stay body 10, so that the fiber-reinforced resin layer 18 is wound in a single layer so that the fiber orientation angle becomes 15 °. The four layers of the laminated structure composed of these four layers are adhered by a linear adhesive, so that the area B has 8 layers and the area C has 16 layers. , The fiber-reinforced resin layers 15, 16, 17, 1 by being heated
8 are integrated and fixed on the outer surface of the stay body 10 to form a bumper support device.

On the other hand, an axial compressive force P is applied to the steel pipe 20 of FIG. 3 (a) having a circular cross section, an outer diameter of about 40 mm and a wall thickness of about 2 mm, as shown in FIG. 3 (b). When it is buckled like a bellows, its load-deformation curve is shown in FIG.
As shown in FIG. 4, as shown in FIG. 4, an epoxy resin film reinforced by carbon fibers arranged in a certain direction and having a thickness of 0.15 mm, and a fiber content of 60% The resin layer 21 so that the fiber orientation angles with respect to the axis of the steel pipe 20 are alternately 75 ° and −75 °,
The tubular body 22 is formed by stacking 8 layers, 16 layers in total, and adhering the layers to the outer surface of the steel pipe 20 with a film-like adhesive, and integrally adhering to the steel pipe 20 by pressing and heating. It is configured, in the tubular body 22,
Similar to the above, when a compressive force in the axial direction is applied to cause buckling deformation in a bellows shape, the load-deformation curve is expressed as II in FIG.

Further, as schematically shown in FIG. 5, an epoxy resin film having a thickness of 0.15 mm, which is reinforced by carbon fibers arranged in a certain direction, and has a fiber content of 60% is used as a fiber reinforced resin layer 21. , The fiber orientation angle of the fiber-reinforced resin layer 21 with respect to the axis of the steel pipe 20 is 15 °, −15 °, 7 in sequence.
The fiber-reinforced resin layers 21 are stacked at 5 ° and −75 ° to form a four-layered laminated structure composed of four layers adhered to each other by a film-like adhesive. 21 is a total of 16 layers and is adhered to the outer surface of the steel pipe 20 with a film-like adhesive to apply pressure,
The tubular body 23 is formed by being integrated by heating and being fixed to the steel pipe 20, and when the tubular body 23 is subjected to the bellows-like buckling deformation by applying the axial compressive force to the tubular body 23, The load-deformation curve is represented as III in FIG.

That is, by wrapping the fiber reinforced resin layer 21 on the outer surface of the steel pipe 20, the maximum load and the average load at the time of buckling deformation of the cylindrical bodies 22 and 23 to which the fiber reinforced resin layer 21 is fixed are determined. Further, the fiber-reinforced resin layer 21 having a large fiber orientation angle can be increased and the steel pipe 20
The tubular body can exhibit stable crushing when it is wound around, and when the fiber orientation angle of the fiber reinforced resin layer 21 wound around the steel pipe 20 is small, the tubular body has high load bearing characteristics. Indicates.

As can be seen from the above, the bumper support device of FIGS. 1 and 2 in which the fiber reinforced resin layers 15, 16, 17, 18 are integrated and fixed on the outer surface of the stay body 10 is provided. When the vehicle collides at a relatively low speed,
Stay body 1 with the smallest maximum load during buckling deformation
The area A of 0 is from the bumper beam 14 to the stay body 1
The load-deformation curve at that time is shown in the X region of FIG. 7 when the vehicle enters a bellows-like buckling deformation due to a load of 0, but when the vehicle collides at a higher speed, the maximum load during buckling deformation is generated. Is also the next largest area B of the stay body 10 is also buckled and deformed in a bellows shape, the load-deformation curve at that time is shown in the Y region of FIG. 7, and when the vehicle collision speed is higher, The area C of the stay body 10 having the largest maximum load in the buckling deformation also continues to undergo buckling deformation in a bellows shape, and the load-deformation curve at that time is shown in the Z region of FIG. 7. , The collision energy is absorbed according to their deformation.

In this case, it is easy to set the buckling load in the stay body 10 appropriately and stably by the fiber-reinforced resin layers 15, 16, 17, 18 wound around the stay body 10. 10 The magnitude of the buckling load of each part is controlled to be different stepwise along the axial direction, and the stay main body 10 is buckled and deformed in order from the tip, so that the bumper support device is provided for a slight collision of the vehicle. It is possible to prevent only the side member 13 from being deformed and damaging the side member 13 and the body of the vehicle (not shown) connected to the side member 13.

In the embodiment shown in FIG. 8, the area A, which occupies about 1/3 of the front surface of the stay body 10, is not processed at all, but occupies about 1/3 of the center thereof. In the area B, the fiber reinforced resin layers 15 and 17 are alternately laminated and wound so that the fiber orientation angles with respect to the axial direction of the stay body 10 are alternately 75 ° and −75 °, and a total of 8 layers are wound.
Each of the layers is adhered by a film-like adhesive, and in the rear C region occupying about 1/3, the stay body 1
The fiber orientation angle with respect to the 0 axis direction is 75 °, -15
Fiber-reinforced resin layer 1 so that the angle becomes 15 °, 15 °, and −75 °
5, 16, 17, and 18 are sequentially overlapped and wound, and a total of 16 layers obtained by repeating them are adhered by a film-like adhesive, and each fiber-reinforced resin layer 15 is pressed and heated after being laminated. , 16, 17, 1
8 is integrated and fixed on the outer surface of the stay main body 10 to form a bumper support device, and the same effect as that of the above-described embodiment can be obtained.

In each of the above embodiments, the fiber reinforced resin layer is adhered to the outer surface of the stay body, but the fiber reinforced resin layer may be adhered to the inner surface of the stay body. Further, it goes without saying that the stay body may be made of other material such as aluminum or may have a rectangular cross section, and further, the size of the adhesive area of the fiber reinforced resin layer adhered to the surface of the stay body and the resin layer In the seat body of the stay body in the front-rear direction of the vehicle, the content of the reinforcing fibers, the orientation angle, or the like, the number of resin layers to be adhered, or the like is changed, or by appropriately changing or combining them. The size of the flexing load can be easily set or controlled in stages, and the buckling deformation of the stay body can be adjusted according to the collision load of the vehicle applied to the stay body. The by causing, in which can be protected from light collision damage of the vehicle body easily and reliably.

[0016]

In the bumper support device according to the present invention, the size of the buckling load of the stay body in the front-rear direction of the vehicle is easily set by adhering the fiber reinforced resin layer to the surface of the stay body, or Since it can be controlled in stages, it is possible to easily and surely protect the damage to the vehicle body side from a light collision by causing the stay body to undergo a predetermined buckling deformation during a vehicle collision at a relatively low speed. it can.

[Brief description of drawings]

FIG. 1 is a schematic side view of an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the above embodiment.

FIG. 3 is an explanatory view of the operation of the above embodiment.

FIG. 4 is an explanatory view of the operation of the above embodiment.

FIG. 5 is an explanatory view of the operation of the above embodiment.

FIG. 6 is an explanatory view of the operation of the above embodiment.

FIG. 7 is an explanatory view of the operation of the above embodiment.

FIG. 8 is an enlarged cross-sectional view of a main part in another embodiment of the present invention.

FIG. 9 is a schematic vertical sectional view of a conventional device.

[Explanation of reference numerals] 10 stay body 13 side member 14 bumper beam 15 fiber reinforced resin layer 16 fiber reinforced resin layer 17 fiber reinforced resin layer 18 fiber reinforced resin layer

Claims (1)

[Claims] 1. A bumper support device having a stay main body attached to an end of a side member of a vehicle and extending in the front-rear direction of the vehicle to support a bumper beam and the like, and a fiber reinforced resin layer adhered to the surface of the stay main body.