JPS6339149Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bumper backup beam structure for supporting a vehicle bumper.

Generally, this type of bumper backup beam is required to be light and strong. Ultra-high tensile steel (steel with a tensile strength of 60 kg or more) is a material that meets this condition, and it is possible to use this to construct a bumper back up beam, but it has the following problems. be.

In other words, ultra-high tensile strength steel is difficult to press due to its physical properties, and is especially difficult to draw to a large extent, so it is used as a material for bumper back up beams.
The use of this ultra-high tensile strength steel presents problems, particularly in the fabrication of beam corners.

The present invention attempts to solve these problems by using high-strength steel (steel with a tensile strength of 35 to 60 kg class), which is relatively easy to process, for the beam corner parts, and for the beam body parts. An object of the present invention is to provide a bumper back-up beam structure for a vehicle that is light, strong, and easy to process by using ultra-high-strength steel that has greater tensile strength than high-strength steel and is also lighter and stronger.

Therefore, the vehicle bumper backup beam structure of the present invention is a vehicle bumper backup beam consisting of a main body and corner parts provided at both ends of the main body, and the corner parts are made of high-tensile steel. In addition, the main body is made of ultra-high tensile strength steel, which has a higher tensile strength than high tensile steel.

Hereinafter, a bumper backup beam structure for a vehicle as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a partial perspective view thereof, and FIG.
Sectional view of the part corresponding to the - arrow line in the figure, 3rd
4 is a plan view showing a modified example thereof, and FIG. 5 is a sectional view showing another modified example corresponding to FIG. 2.

As shown in FIG. 1, the bumper backup beam of the present invention has a substantially linear main body part 1 and curved corner parts 2 joined to both ends thereof via joint parts 4. A bumper stay 3 for mounting on a vehicle body is fixed to the back surface of the portion 1.

By the way, the main body part 1 is made of ultra-high tensile steel (steel with higher tensile strength than high tensile steel),
It is made by bending this ultra-high tensile steel into a U-shape.

Further, the corner portion 2 is made of high-tensile steel, and is made by drawing this high-tensile steel with a press.

Note that the bumper stay 3 is made by processing a hot-rolled steel plate for an automobile into an L-shaped cross section.

By the way, as a method of manufacturing this bumper back up beam, as shown in Fig. 3, an ultra-high tensile strength steel plate A and a high tensile strength steel plate B are joined in advance by laser welding or the like, and then, in a press, Ultra high tensile strength steel plate A
The main body part 1 is formed by bending the steel plate B, and the corner part 2 is formed by drawing the high-tensile steel plate B.
Alternatively, the ultra-high tensile strength steel main body part 1 which has been subjected to a bending process in advance and the high tensile strength steel corner part 2 which has been subjected to a drawing process.
They may then be joined by laser welding or the like.

In this way, by effectively using ultra-high tensile strength steel, it is possible to reduce the plate thickness and contribute to weight reduction, and by using the ultra-high tensile steel in appropriate locations, workability is improved. It is also advantageous in terms of cost.

The surface of the bumper backup beam completed as described above is coated with a bumper skin material 5, as shown in FIG.

Furthermore, the structure of the present invention can also be applied to a bumper backup beam having corner portions 2' with little curling as shown in FIG.

Of course, in this case as well, the main body portion 1 is made of ultra-high tensile strength steel, and the corner portion 2' is made of high tensile strength steel.

Furthermore, the bumper backup beam having this structure can be covered with a bumper skin material 5 having a urethane core (energy absorbing material) 6, as shown in FIG.

As described in detail above, according to the vehicle bumper backup beam structure of the present invention, in the vehicle bumper backup beam consisting of a main body portion and corner portions provided at both ends of the main body portion, the corner portions are Since it is made of high-tensile steel and the main body is made of ultra-high-tensile steel that has a higher tensile strength than high-tensile steel, it has the advantage of being light, strong, and easy to process.

[Brief explanation of drawings]

The figures show a bumper backup beam structure for a vehicle as an embodiment of the present invention, in which Fig. 1 is a partial perspective view thereof, Fig. 2 is a sectional view of a portion corresponding to the - arrow line in Fig. 1; FIG. 3 is a developed view showing the state before processing, FIG. 4 is a plan view showing a modified example thereof, and FIG. 5 is a sectional view showing another modified example corresponding to FIG. 2. DESCRIPTION OF SYMBOLS 1...Ultra-high tensile steel main body part, 2, 2'...High tensile strength steel corner part, 3...Bumper stay, 4...Joint part, 5...Bumper skin material, 6...Urethane core, A ...Ultra high tensile strength steel plate, B...High tensile strength steel plate.

Claims (1)

[Scope of utility model registration request] In a vehicle bumper backup beam consisting of a main body and corner parts provided at both ends of the main body, the corner parts are made of high-strength steel, and the main body has a tensile strength higher than that of high-tensile steel. A bumper back-up beam structure for vehicles that is characterized by being constructed of ultra-high tensile strength steel.