CN206217823U - A kind of bumper energy absorption buffer structure - Google Patents

Abstract

The utility model discloses an energy-absorbing buffer structure for a bumper, which sequentially comprises from inside to outside: an energy-absorbing sheet bracket fixed on the front anti-collision beam of an automobile, and an elastic energy-absorbing bracket fitted on the energy-absorbing sheet bracket. sheet, the energy-absorbing foam attached to the elastic energy-absorbing sheet, and the outer skin. The energy-absorbing sheet bracket of the utility model has high strength and rigidity, is not easily deformed, is fixed with the front anti-collision beam, and transmits the energy of severe collision to the rear of the vehicle together. The energy-absorbing sheet is embedded in the middle of the bracket of the energy-absorbing sheet, has relatively small rigidity and strength, and can be deformed and crushed backward under relatively small collision energy. The shape of the energy-absorbing foam fits the energy-absorbing sheet before deformation, and can break along the fragile part in the middle during a collision, and slide to the upper and lower sides until it is caught by the energy-absorbing sheet bracket. The utility model can increase the buffer distance when the automobile collides with pedestrians, increase the absorbed energy, and reduce the damage to pedestrians.

Description

A bumper energy-absorbing buffer structure

technical field

The utility model relates to an energy-absorbing buffer structure of an automobile bumper.

Background technique

When a car collides, when the collision energy is small, the bumper cover on the surface of the car is deformed and the foam is filled to absorb energy; when the collision energy is large, the front anti-collision beam of the car is transmitted to the energy-absorbing device, and the energy-absorbing device collapses absorb energy. However, when a pedestrian collides with a car, the energy is small. According to the test results of the 40km/h forward collision dummy model (polar) of Honda Vezel, the bumper, engine cover and other covering parts of the car are deformed, and the body structure has no obvious deformation.

Therefore, there are two main structures for the front bumper of a car to protect pedestrians, one part is the body plastic cover, which is generally made of polyurethane (or other resin materials) and reinforcing materials (glass fiber powder, silica lime, etc.) reaction injection molding (RIM) formation, has good elasticity and deformation recovery ability, and will produce a large amount of deformation in the event of a collision. The other part is filled with foam parts, which are generally molded by beads of expanded polypropylene (EPP) or other foam materials (expanded polystyrene EPS, expanded polyethylene PEP, etc.), among which EPP with the best performance is For example, in the above-mentioned 40km/h pedestrian collision test, no obvious plastic deformation occurred.

It can be seen from the principle of work that when a collision occurs, the greater the deformation of the bumper, the more energy it absorbs. Existing cars generally use energy-absorbing foam to fill the gap between the anti-collision beam and the bumper skin in protecting pedestrians. Although the cushioning and energy-absorbing performance of filling foam is good, its compression deformation rate after collision is small when the car is running at low speed. , which limits the greater deformation of the plastic bumper, which is not good for pedestrian protection.

To sum up, when a car with an ordinary bumper collides with a pedestrian, the filling foam cannot be greatly deformed, and the energy absorption effect of the filling foam is not obvious, which may cause excessive acceleration of the pedestrian's legs and cause injury to the pedestrian .

Utility model content

The utility model that solves the above-mentioned technical problems designs a crushable structure with larger deformation on the common bumper structure, and connects an elastic energy-absorbing sheet that is easy to buckle on the back of the energy-absorbing foam, so that the structural design of the energy-absorbing foam is easily In the brittle fracture part, the fracture and movement of the energy-absorbing foam absorbs energy, and at the same time increases the deformable space of the bumper skin and increases the buffer distance in the event of a collision.

The utility model adopts following technical scheme to realize:

An energy-absorbing buffer structure for a bumper, which sequentially includes from the inside to the outside:

An energy-absorbing sheet bracket fixed on the front anti-collision beam of the automobile, an elastic energy-absorbing sheet fitted on the energy-absorbing sheet bracket, an energy-absorbing foam attached to the elastic energy-absorbing sheet, and an outer skin.

Further, the upper and lower sides of the bracket of the energy-absorbing sheet are respectively provided with fitting deformation parts of the energy-absorbing sheet for fitting the elastic energy-absorbing sheet and leaving space for the deformation of the elastic energy-absorbing sheet, and are used to limit the breakage of the energy-absorbing foam. Rear deformation limit extension. Therefore, sufficient space is left for the deformation of the elastic energy-absorbing sheet, and at the same time, the deformation of the energy-absorbing foam after rupture is properly restricted.

Further, the elastic energy-absorbing sheet and the energy-absorbing foam are arranged in sections along the length direction of the energy-absorbing sheet bracket, so as to avoid the situation that the elastic energy-absorbing sheet cannot be effectively deformed and the energy-absorbing foam cannot be broken due to excessive transverse strength.

Further, the bracket of the energy-absorbing sheet is bolted to the front anti-collision beam of the automobile, and the material is the same as that of the front anti-collision beam of the automobile.

Further, the thickness of the energy-absorbing sheet bracket is 2-3 mm.

Further, the elastic energy-absorbing sheet is made of low-strength and low-rigidity materials, including aluminum alloy and low-carbon steel.

Further, the thickness of the elastic energy-absorbing sheet is 1-2 mm.

Further, the internal shape of the energy-absorbing foam is the same as that of the elastic energy-absorbing sheet when it is installed and not deformed.

Further, the energy-absorbing foam material is expanded polypropylene.

Compared with the prior art, the energy-absorbing sheet bracket of the utility model has high strength and high rigidity, and can transmit the collision force backward in combination with the front anti-collision beam of the automobile; the elastic energy-absorbing sheet has low strength and low rigidity, and can Deformation, crushing and energy absorption occur when pedestrians collide; the energy-absorbing foam can break from the designed weak point when colliding, and slide up and down to increase the buffer distance when pedestrians collide. The utility model reduces the peak acceleration of the pedestrian's leg from the angle of the acceleration of the pedestrian's leg when the car collides with the collision time, increases the absorbed collision energy and buffer distance, and reduces the injury to the pedestrian during the collision.

Description of drawings

Fig. 1 shows a three-dimensional exploded schematic diagram of the energy-absorbing buffer structure of the bumper according to the embodiment of the present invention.

Fig. 2 shows a schematic cross-sectional view of the bumper energy-absorbing buffer structure according to the embodiment of the present invention.

Fig. 3 shows a schematic structural view of the energy-absorbing plate bracket of the bumper energy-absorbing buffer structure according to the embodiment of the present utility model.

Fig. 4 is a schematic diagram showing the deformation of the energy-absorbing buffer structure of the bumper according to the embodiment of the present invention after collision.

Fig. 5 shows a comparison diagram of the energy absorption principle of the embodiment of the utility model and the structure of a common bumper.

As shown in the figure: 1- the front anti-collision beam of the car; ; 5-elastic energy-absorbing sheet.

detailed description

An embodiment of the utility model will be described in detail below with reference to the accompanying drawings. The dimensions and materials in this embodiment are only illustrative examples for understanding the functions of the utility model, and do not limit the actual details of the utility model. Components with substantially the same function and structure in other illustrations will not be repeatedly described, and components not directly related to the present utility model have been omitted.

As shown in Figures 1 and 2, a bumper energy-absorbing buffer structure includes, from the inside to the outside: an energy-absorbing sheet bracket 2 fixed on the front anti-collision beam 1 of the automobile, and an energy-absorbing sheet bracket The elastic energy-absorbing sheet 5 on the frame 2, the energy-absorbing foam 4 and the outer skin 3 attached to the elastic energy-absorbing sheet 5.

As shown in Figure 3, the upper and lower sides of the energy-absorbing sheet bracket 2 are respectively provided with energy-absorbing sheet fitting deformation parts 21 for fitting the elastic energy-absorbing sheet 5 and leaving a space for the elastic energy-absorbing sheet 5 to deform. The limiting extension 22 is used to limit the deformation of the energy-absorbing foam after it breaks. Therefore, enough space is left for the deformation of the elastic energy-absorbing sheet 5, and at the same time, the deformation of the energy-absorbing foam after rupture is properly restricted.

The elastic energy-absorbing sheet 5 and the energy-absorbing foam 4 are arranged in three sections along the length direction of the energy-absorbing sheet bracket 2, so as to avoid the situation that the energy-absorbing sheet cannot be effectively deformed and the energy-absorbing foam cannot be broken due to excessive transverse strength. As a result, the ideal deformation effect cannot be produced. It can also be set to other numbers of multi-stages as required, such as four-stages. The elastic energy-absorbing sheet 5 is made of low-strength and low-rigidity materials, including aluminum alloy, low-carbon steel, etc., and is embedded in the energy-absorbing sheet bracket 2 by utilizing the elasticity of the material, with a thickness of 1-2mm, which can be attached to the vehicle body. The thickness of the sheet metal parts is similar to ensure a certain degree of elasticity and a lower strength limit, which can be determined according to the actual structure. The elastic energy-absorbing sheet 5 is embedded in the energy-absorbing sheet bracket 2 relying on the expansion elastic force in the up-and-down direction. Since there is an interaction force between the energy-absorbing sheet bracket 2 and the elastic energy-absorbing sheet 5 during installation, the elastic energy-absorbing sheet 5 relies on Friction does not produce lateral movement. The shape design of the elastic energy-absorbing sheet refers to the design shown in FIG. 2 .

The energy-absorbing sheet bracket 2 is connected to the front anti-collision beam 1 of the automobile through bolts (refer to the installation position shown in Figure 1, the installation position is arranged in the space between the elastic energy-absorbing sheet 5 and at both ends), and the material is compatible with the front anti-collision beam of the automobile. Beam 1 is the same, with a thickness of 2 to 3 mm to ensure high strength. Its design shape basically fits the front anti-collision beam 1 of the automobile. The specific details are designed according to the anti-collision beam.

The internal shape of the energy-absorbing foam 4 is the same as the shape of the elastic energy-absorbing sheet 5 when it is not deformed after installation, so as to ensure that the two roughly fit together, and its material can be foams such as expanded polypropylene (EPP) widely used in the market. The material, its specific shape in the transverse direction of the vehicle can be designed according to the structure. The shape of the front part of the energy-absorbing foam 4 is designed with reference to the shape of the specific skin. In this embodiment, it is assumed that the space inside the outer skin 3 of the bumper is large enough. After the front part of the energy-absorbing foam 4 is installed, there is an There must be a certain gap, so the front part is designed as a simple curved surface. In actual design, the design can be adjusted according to different bumper structures.

As shown in Figure 4, because the energy-absorbing sheet has low strength and low stiffness, it can be deformed and crushed and absorb energy when a pedestrian collides. Up and down, increase the buffer distance when pedestrians collide.

After the design, production and installation of this embodiment are completed, tests should be carried out to ensure that the entire device can work according to the above theory. If there is a difference in the specific effect, structural analysis should be carried out and the design should be adjusted to meet the requirements. As shown in Figure 5, the effect of the entire energy-absorbing buffer structure in actual collisions, the test results of this device and its adjustment design device (the leg acceleration time curve of the pedestrian crash test) should generally have the shape shown in the figure, corresponding to Compared with the test results with ordinary bumpers, the peak value of the leg acceleration curve will be reduced, and the overall curve will be longer along the time axis.

The above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included in the protection scope of the claims of the utility model.

Claims (9)

1. A bumper energy-absorbing buffer structure, characterized in that, from the inside to the outside sequentially comprising: The energy-absorbing sheet bracket (2) fixed on the front anti-collision beam (1) of the automobile, the elastic energy-absorbing sheet (5) fitted on the energy-absorbing sheet bracket (2), and the elastic energy-absorbing sheet attached to the The energy-absorbing foam (4) and the outer skin (3) on the sheet (5). 2. The bumper energy-absorbing buffer structure according to claim 1, characterized in that: the upper and lower sides of the energy-absorbing sheet bracket (2) are respectively provided with elastic energy-absorbing sheets (5) for fitting and are elastic The energy-absorbing sheet (5) is deformed to leave a space for the energy-absorbing sheet to fit the deformation part (21), and the limit extension part (22) for limiting the deformation of the energy-absorbing foam after breaking. 3. The bumper energy-absorbing buffer structure according to claim 1, characterized in that: the elastic energy-absorbing sheet (5) and the energy-absorbing foam (4) are segmented along the length direction of the energy-absorbing sheet bracket (2) set up. 4. The bumper energy-absorbing buffer structure according to claim 1, characterized in that: the energy-absorbing sheet bracket (2) is connected to the front anti-collision beam (1) of the automobile through bolts, and the material is the same as that of the front anti-collision beam of the automobile (1) same. 5. The bumper energy-absorbing buffer structure according to claim 1, characterized in that: the thickness of the energy-absorbing sheet bracket (2) is 2-3 mm. 6. The bumper energy-absorbing buffer structure according to claim 1, characterized in that: the elastic energy-absorbing sheet (5) is made of low-strength and low-rigidity materials, including aluminum alloy and low-carbon steel. 7. The bumper energy-absorbing buffer structure according to claim 1, characterized in that: the elastic energy-absorbing sheet (5) has a thickness of 1-2 mm. 8. The bumper energy-absorbing buffer structure according to claim 1, characterized in that: the internal shape of the energy-absorbing foam (4) is the same as that of the elastic energy-absorbing sheet (5) when it is installed and not deformed. 9. The bumper energy-absorbing buffer structure according to claim 1, characterized in that: said energy-absorbing foam (4) is made of foamed polypropylene.