JPH042102Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a bumper structure for an automobile for absorbing impact during a collision or the like.

[Technical background of the invention and its problems]

BACKGROUND ART Generally, bumpers are provided at the front and rear ends of an automobile to absorb shocks such as those caused by a collision. There are various types of bumpers of this type, and one of them, as shown in FIG. 4, is a bumper 4 constructed by sequentially joining a cushioning material 2 and a reinforcement 3 inside a bumper face 1 made of synthetic resin. do. There is also a vehicle in which the bumper 4 is attached and fixed to a bracket 6 fixed to the upper end of the frame 5 of the vehicle body. In that case, for example, for design reasons, the reinforcement member 3 may be installed with its center in the height direction shifted upwards from the center of the frame 5, that is, installed in an offset state.

However, when the buffering force shown by the arrow F in the figure is applied to the bumper 4 installed in an offset state in this way, the heightwise center of the reinforcement 3 is shifted from the center of the frame 5, so that the bumper 4 is A rotational force in the direction indicated by arrow M is generated.
As a result, the bumper 4 would fall in the direction of arrow M, causing the bracket to be deformed and the mounting condition to be deviated, and the lamp grill located immediately above the bumper to be destroyed.

[Purpose of invention]

This invention provides an automobile bumper structure that prevents the bumper from collapsing due to rotational force generated when an impact force is applied to the bumper, deforming the bracket, or destroying the lamp grill. The purpose is to

[Summary of the invention] This invention consists of a frame that extends in the longitudinal direction of the vehicle body, a bracket that is connected in the height direction at the end of the frame, and a frame that extends in the vehicle width direction and has one end face in the longitudinal direction of the vehicle body. A reinforcement member is fixed to the end of the frame and the bracket, and a cushioning material is provided on the inner surface of the bumper ace, extends in the vehicle width direction along the bumper ace, and is fixed to the other end surface of the reinforcement member. The cushioning material has a honeycomb structure with partition walls extending along the longitudinal direction of the vehicle body, and is formed so that the density of the holes in the honeycomb structure differs in the height direction. It is characterized by being dense in the horizontal plane including the attachment point between the vehicle body frame and the reinforcement.

[Example of idea]

An embodiment of this invention will be described below with reference to FIGS. 1 to 3. FIG. 2 shows the appearance of the entire automobile, and numeral 11 in the figure is the vehicle body. A bumper 12 is attached to the front end of this vehicle body 11. As shown in FIG. 1, this bumper 12 has a bumper face 13 made of synthetic resin such as urethane foam.
has. Inside the bumper face 13, a cushioning material 14 and a rectangular cylindrical reinforcement 15, which will be described later, are successively joined and fixed. The bumper 12 is attached and fixed via a reinforcement 15 to a bracket 17 fixed to the front end of a frame 16 (side member) of the vehicle body. The vertical center of the reinforcement 15 is the frame 1
It is located above the center of No. 6. In other words,
The bumper 12 is mounted offset to the frame 16. The reinforcement 15 is made of a steel plate or a synthetic resin having sufficient strength. Further, the buffer material 14 is formed of synthetic resin or the like into a honeycomb structure. The mesh density of the cushioning material 14 is the third
As shown in the figure, the lower half is denser than the upper half in the height direction. That is, frame 1
It is densely formed in the region facing 6.
Therefore, if the impact force F applied to the bumper 4 is divided into component forces Fu and Fd applied to the upper and lower halves of the bumper 12, respectively, Fu<Fd. Therefore, the resultant force Fc of these component forces is lower than the impact force F and acts on the frame 16.

According to this structure, the cushioning material 14 has a honeycomb structure, and the density of the mesh is denser in the lower half than in the upper half in the height direction, so that the impact force F applied to the bumper 12 is reduced to If the force is divided into a component force Fu applied to the upper half of the buffer material 14 and a component force Fd applied to the lower half, Fd>Fu. Therefore, the resultant force Fc of these component forces acts on the bracket 17 via the reinforcement 15 at a position lower than the impact force F, so that the reinforcement 15 is installed in an offset state with respect to the frame 16. Even if the bumper 12 is tilted, a large rotational force is generated in the bumper 12 and the bumper 12 is prevented from falling over.

[Effect of idea]

As described above, the cushioning material of the present invention has a honeycomb structure with partition walls extending along the longitudinal direction of the vehicle body, and is formed so that the density of the mesh of the honeycomb structure differs in the height direction. Since the mesh of the honeycomb structure is dense in the horizontal plane that includes the fixing point between the vehicle body frame and the reinforcement, the point of application of the impact force acting on the bumper face is deviated upward or downward from the horizontal plane. Even if the impact force is applied to the bumper face, the point of application of the force transmitted from the cushioning material to the reinforcement can be brought closer to the horizontal plane than the point of application of the impact force acting on the bumper face. Therefore, a large rotational force about the axis along the longitudinal direction of the bumper is not generated in the bumper, and deformation of the bracket and destruction of the lamp grill can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a bumper showing an embodiment of this invention, Fig. 2 is a perspective view of an automobile, Fig. 3 is a front view of a portion of the cushioning material, and Fig. 4 is a sectional view of a conventional bumper. . 12... Bumper, 13... Bumper Ace, 1
4... Cushioning material, 15... Reinforcement, 16
...Frame, 17...Bracket.

Claims (1)

[Scope of utility model registration request] A frame that extends in the longitudinal direction of the vehicle body, a bracket that is connected in the height direction at the end of the frame, and a link that extends in the width direction of the vehicle and has one end surface in the longitudinal direction of the vehicle body fixed to the end of the frame and the bracket. The cushioning material is provided on the inner surface of the bumper ace, extends in the vehicle width direction along the bumper ace, and is fixed to the other end surface of the reinforcement. It has a honeycomb structure due to the partition walls extending from the top, and is formed so that the density of the holes in the honeycomb structure differs in the height direction.
A bumper structure for an automobile, characterized in that the honeycomb structure is densely arranged in a horizontal plane including the attachment point between the vehicle body frame and the reinforcement.