JP2003146157A - Structure of bumper for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a bumper for vehicle capable of preventing a bumper face from being cut by an impact caused by light collision of a vehicle to a narrow obstacle such as a pole. SOLUTION: The bumper for vehicle comprises a bumper beam 4 fixed to a frame of a car body via a stay and arranged at an appropriate position around the car body, a shock absorber arranged at the bumper beam, and a bumper face arranged outside of the shock absorber. In the structure of the bumper for vehicle, the shock absorber comprises a shock absorber main body 1 and a reinforcement shock absorber body 3 attached to outside of the shock absorber body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy absorbing member at the time of collision of a vehicle, particularly to a vehicle bumper structure attached to the periphery of the vehicle, that is, the front and rear portions of the vehicle, the left and right sides of the vehicle, and the like. A bumper structure for a vehicle that prevents a bumper face from breaking due to the impact when the vehicle lightly collides with a narrow obstacle (hereinafter referred to as a light collision) and reduces the repair cost of the bumper. is there.

[0002]

2. Description of the Related Art Due to the movement of the global insurance industry, unnecessary bumper replacement is reduced as much as possible because the bumper is damaged when a vehicle collides with a telephone pole or a gate pole. Reduction is required. By the way, in general, in order to protect the vehicle body from damage in the event of a collision, a bumper structure provided at the front and rear of the vehicle is a combination of a bumper beam and foam.

The structure of this vehicle bumper will be briefly described. FIG. 6 is a cross-sectional view of a conventional vehicle bumper, FIG. 7 is a plan view of the bumper, and FIG. 8 is a bumper and a pole. FIG. 9 is a plan view of the above situation, and FIG. 9 is a side view of the state where the bumper and the pole have slightly collided. In the figure, 101 is a bumper face, 102 is a foamed foam as a cushioning body, 1
Reference numeral 03 is a bumper beam, 104 is a bumper stay, and 105 is a side frame. The bumper stay 104 is a side frame 10 arranged on the left and right of the vehicle in the front-rear direction.
The bumper beam 103, which extends in the lateral direction of the vehicle, is fixed to the bumper stay 104 by an appropriate fixing means. As shown in the figure, a shock absorber (foam foam) is attached to the bumper beam 103 by a conventionally known method, and the bumper face 101 is arranged on the outside of the foam foam 102 so as to match the outer surface of the vehicle as conventionally known. Is fixed to the vehicle body by appropriate fixing means.

In the bumper structure for a vehicle having the above-mentioned structure, when the surface of a fence, wall, or the like collides lightly with a flat object, the collision force is wide because the collision surface is wide. There is the advantage that the damage to the bumper is relatively small and the repair cost is low, without concentrating on one point.
However, in the bumper structure as described above, for example, as shown in FIG. 8 and FIG. 9, when a small obstacle 106 such as a pole is slightly collided with, a local input acts on a part of the bumper. The foamed foam 102 constituting the bumper is concavely deformed as shown in FIGS. 8 and 9, and the deformation of the bumper face 101 cannot follow the deformation.
A situation occurs in which a break occurs. When such a bumper face disconnection occurs, the bumper face 1
01 is required to be replaced, and there is a problem that repair cost (repair cost) due to replacement is increased.

[0005]

Therefore, in order to prevent the bumper face from being cut off when a small collision occurs with an obstacle having a small collision area such as the pole as described above, Japanese Patent Laid-Open No. 2000-85 has been proposed.
A bumper structure as described in 496 has been proposed. This bumper structure has a structure in which a predetermined concave portion is provided on the collision side surface of the bumper reinforcement and a reinforcing body (pipe) partially fitted in the concave portion is embedded, and the impact at the time of collision is the bumper reinforcement collision surface. It is intended to relieve the deformation that the reinforcing body is about to sink into the bumper reinforcement cross section by being dispersed and transmitted to the.
However, in this structure, the compressive force transmitted to the pipe at the time of a light collision is transmitted to the bumper reinforcement only by the adhesive force between the pipe and the reinforcement, and there is a problem that the impact force is not necessarily dispersed effectively.

In addition to the above-described example, on the bumper face side, a bead or the like for improving the strength may be provided on the bumper face as a countermeasure against such breakage. Distortion occurs due to the difference in wall thickness of the bumper face, which is not desirable in appearance. Further, the weight of the bumper face increases, which not only violates the recent demand for weight reduction of automobiles but also increases the cost of the bumper face.

Therefore, according to the present invention, in order to reduce the repair cost when colliding with a narrow obstacle such as a pole or the like, the local input by the obstacle input is applied to the structure in which the bumper beam and the cushioning body improve the light collision performance. The purpose of the structure is to reduce the repair cost due to face breakage by adopting a structure that distributes the load with a cushioning body and suppresses local deformation that enters the bumper face. The present invention comprises, as a vehicle body bumper structure, a bumper beam connecting side frames and a shock absorber provided on the bumper beam, and a reinforcement body that is harder and thinner than the shock absorber body on the vehicle body outer surface of the shock absorber body. By adopting a structure with a buffer embedded, it is possible to reduce the repair cost by overcoming face disconnection by distributing the surface pressure for local input at the time of pole collision.

[0008]

For this reason, the technical solution adopted by the present invention is provided on the bumper beam, which is fixed to the frame of the vehicle body through the stay and is arranged at a proper position around the vehicle body. A bumper structure for a vehicle, comprising a cushioning body and a bumper face arranged outside the cushioning body, wherein the cushioning body comprises a cushioning body and a reinforcing cushioning body attached to the outside of the cushioning body. The vehicle bumper structure is characterized by being A bumper structure for a vehicle is characterized in that a recess is formed in the buffer body, and a reinforcing buffer is attached to the recess. Further, in the vehicle bumper structure, the concave portion formed in the buffer body is formed in a shape capable of preventing the reinforcing cushion from falling off. Further, in the bumper structure for a vehicle, as a shape capable of preventing the reinforcing cushioning body from falling off, the recessed portion formed in the cushioning body has a wide recessed portion which is vertically separated at an end portion of the recessed portion. is there. Further, the bumper structure for a vehicle is characterized in that a protrusion is formed in a recess formed in the buffer body, and a fitting portion for fitting the protrusion is formed in the reinforcing buffer body. Further, in the bumper structure for a vehicle, the reinforcing cushioning body embedded in the recess formed in the cushioning body does not have the same sectional shape. Also, the buffer member main body and the reinforcing buffer body is molded in foamed form, the cushion thickness of expanded foam body constituting the body W0, the foam hardness [rho _0, constitute the reinforcing buffer body the thickness of the expanded foam to be W1, a bumper structure for a vehicle that satisfies the relationship of [W0 »W1, ρ ₀ «ρ _1] when the foam hardness was [rho _1.
With the above configuration, the present invention makes it possible to disperse the surface pressure with respect to the local input at the time of a pole collision, overcome the face breakage, and reduce the repair cost.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A vehicle bumper structure according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a mounted state of the bumper structure according to the first embodiment of the present invention. 2 is a cross-sectional view of a state in which a reinforcing body is attached. Since the relationship between the bumper face, the cushioning body (foamed foam), the bumper beam, the bumper stay, and the side frame is the same as the conventional one, the configuration of the cushioning body, which is a feature of the present invention, will be mainly described below.

In the figure, reference numeral 1 is a buffer body provided on a bumper beam 4 for connecting side frames of a vehicle,
The buffer body is fixed to the bumper beam 4 by a conventionally known means. In this example, foamed foam is used as the buffer body 1. This foamed foam main body is formed of a material having a foaming hardness of ρ ₀ so as to have a length corresponding to the bumper length and a thickness of W 0 as shown in FIG. Further, as shown in the drawing, a concave portion 2 having an appropriate shape is formed on the surface of the foamed foam body 1 on the outer side of the vehicle. The recess 2 is formed so that the thickness t of the foamed foam body from the bottom of the recess 2 can maintain at least the shock absorbing performance, and further, the depth d corresponds to the thickness of the reinforcing cushioning body 3 described later. Is molded as.

The reinforcing cushioning body 3 fitted in the recess 2 formed in the cushioning body 1 is formed of foamed foam in this example, and the reinforcing foaming foam is the cushioning body 1.
Formed as a thickness W1 that fits into the recess 2 formed in
Further, the reinforcing foam foam 3 is molded from a material having a foaming hardness ρ ₁ higher than that of the foaming foam body ρ ₀ (that is, the foaming foam body and the reinforcing foaming foam are W 0. ≫W ₁ , ρ ₀ ≪ρ ₁
Has become a relationship). The reinforcing cushioning body (reinforcing foam foam) 3 thus formed is fitted into the recessed portion 2 formed in the cushioning body (foam foam body) 1 and an appropriate means (
For example, the cushioning body is formed by adhering or by fixing with a reinforcing foam foam during molding of the foam foam body).

The bumper face is fixed to the surface side of the thus constructed cushioning member by a conventionally known means. When a light collision occurs in the bumper structure with this structure, the load is dispersed by the energy absorbing member as the original cushioning body and partial deformation for local input such as pole input while maintaining the stroke with the reinforcing cushioning body. Suppresses local deformation of the face. In this way, it is possible to reliably prevent bumper breakage that tends to occur on the bumper face during a light collision.

The second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in the shape of the reinforcing cushioning body. The reinforcing cushioning body of this example is formed as a separating shape 5 whose both ends are spread vertically, and the recess 2 formed in the cushioning body 1 is also formed in conformity with the reinforcing cushioning body 3. In this example, a foamed foam is used as the cushioning body, and the thickness of the foamed foam body, the thickness of the reinforcing foamed foam, and each foaming hardness have the same relationship as in the first embodiment. By changing the end shape of the recess as in this example, the embedding strength of the reinforcing buffer is improved, and when the reinforcing buffer is attached to the recess of the buffer body, the reinforcing buffer is prevented from falling off. can do.

The third embodiment will be described with reference to FIG. In the third embodiment, the projection 6 is formed inside the concave portion formed in the buffer body, and the reinforcing cushioning body is also formed with the hole 7 into which the projection 6 is fitted. Further, the reinforcing cushioning body 3 is formed as a separate shape that extends in the vertical direction at both ends similarly to the second embodiment, and the recess formed in the cushioning body is formed in a shape that matches the reinforcing cushioning body 3. In this example, a foamed foam is used as the cushioning body, and the thickness of the foamed foam body, the thickness of the reinforcing foamed foam, and each foaming hardness have the same relationship as in the first embodiment.

The fourth embodiment will be described with reference to FIG. In addition, in the figure, the reinforcing cushioning body is a view seen from the joint side with the cushioning body. The fourth embodiment has a structure in which the protrusion 8 formed inside the recess of the buffer body can be fitted into the recess 9 formed in the reinforcing buffer 3.
Further, when the projections 8 formed on the cushioning body are fitted into the recesses formed on the reinforcing cushioning body, at least two projections 8 are dimensioned so as to be firmly fitted 10 in the recesses.
The reinforcing cushioning body is securely held by the cushioning body. In this case, the reinforcing cushioning body is in a state of slightly protruding from the surface of the cushioning body. In this example, foamed foam is used as the cushioning body, and the thickness of the foamed foam body, the thickness of the reinforcing foamed foam, and each foaming hardness have the same relationship as in the first embodiment. As described above, according to the present invention, the recess is formed on the outer side surface of the buffer body, and the reinforcing buffer is fitted into the recess, so that the bumper face can be surely cut even when the pole or the like is lightly hit. Can be prevented.

Although the present invention has been described with reference to an example in which foamed foam is used as the buffer, the buffer is made of a material (for example, a synthetic resin such as nylon) that can achieve the same function without being limited to the foamed foam. It is also possible to use It is also possible to change the material of the buffer body and the reinforcing buffer. The shape of the recess formed in the buffer body (foamed foam body) may be any other shape as long as it can achieve the same function. Further, it goes without saying that the present embodiment can be applied to a side bumper arranged on the vehicle side. further,
The present invention can be embodied in various other forms without departing from the spirit and the main characteristics thereof. Therefore, the above-mentioned embodiment is merely an example and should not be limitedly interpreted. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

[0017]

As described in detail above, according to the present invention,
As a vehicle body bumper structure, it is composed of a bumper beam connecting side frames and a cushioning body provided on the bumper beam, and a cushioning body for reinforcement, which is harder and thinner than the cushioning body, is embedded in the vehicle body outer surface of the cushioning body. With such a structure, it is possible to achieve an excellent effect that surface pressure is dispersed to overcome a face breakage and local repair cost can be reduced with respect to local input at the time of a pole collision.

[Brief description of drawings]

FIG. 1 is an explanatory view of attachment of a foamed foam body and a reinforcing foamed foam according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of an attachment portion between the foamed foam body and the reinforcing foamed foam according to the first embodiment.

FIG. 3 is an explanatory view of attachment of a foamed foam body and a reinforcing foamed foam according to a second embodiment of the present invention.

FIG. 4 is an explanatory view of attachment of a foamed foam main body and a reinforcing foamed foam according to a third embodiment of the present invention.

FIG. 5 is an explanatory view of attachment of a foamed foam body and a reinforcing foamed foam according to a fourth embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional vehicle bumper.

FIG. 7 is a plan view of the bumper of FIG.

FIG. 8 is a plan view of a situation where a conventional bumper and a pole have a slight collision.

FIG. 9 is a side view showing a state where the bumper and the pole have slightly collided with each other.

[Explanation of symbols]

1 Buffer body (foam foam body) 2 recess 3 Reinforcement buffer (reinforcement foam) 4 bumper beam 5 separate shapes 6 protrusions 7 holes 8 protrusions 9 recess

Claims (7)

[Claims] 1. A bumper beam fixed to a frame of a vehicle body via a stay and arranged at a proper position around the vehicle body, a shock absorber provided on the bumper beam, and a bumper face arranged outside the shock absorber. A bumper structure for a vehicle, wherein the shock absorber comprises a shock absorber main body and a reinforcing shock absorber attached to the outside of the shock absorber main body. 2. The bumper structure for a vehicle according to claim 1, wherein a recess is formed in the buffer body, and a reinforcing buffer is attached to the recess. 3. The vehicle bumper structure according to claim 2, wherein the recess formed in the buffer body is formed in a shape capable of preventing the reinforcing buffer from falling off. 4. The recess formed in the buffer body has a vertically separated wide recess at the end of the recess as a shape capable of preventing the reinforcing cushion from falling off. The bumper structure for vehicle according to item 3. 5. A protrusion is formed in a concave portion formed in the buffer body, and a fitting portion for fitting the protrusion is formed in the reinforcing cushion body. The bumper structure for vehicles according to claim 4. 6. The bumper structure for a vehicle according to claim 2, wherein the reinforcing cushioning bodies embedded in the recesses formed in the cushioning body do not have the same sectional shape. 7. The cushioning body and the reinforcing cushioning body are
It is made of foam and forms the buffer body.
The thickness of the foam body is W0 and the foam hardness is ρ ₀,Previous
The thickness of the foamed foam constituting the reinforcing cushion is W1,
Foam hardness ρ₁And satisfy the following relationship
The vehicle according to any one of claims 1 to 6, characterized in that
Bumper structure. W0 >> W1, ρ₀≪ρ₁