JPH04123710U - impact door beam - Google Patents

Abstract

(57) [Summary] [Purpose] An impact door beam that has sufficient strength in the central part, where large impacts are applied, and is lightweight. [Structure] The impact door beam 1 has a central portion 2 formed with a rectangular cross-section, and both end portions 3, 3 formed with a thin round cross-section within the dimension of the opposite side of the cross-sectional angle.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention can be used as an absorber for the impact applied from the side to a car during a collision. Regarding the impact door beam.

0002

[Conventional technology]

In the event of an accident, the impact force is not always applied to the vehicle body from the front, but rather from the side. A large impact force may be applied from someone. Protect the occupants in such cases For this reason, we have traditionally installed an impact beam on the inside of the door to absorb shock. There is. Such an impact door beam may be a straight pipe with a round cross section, or Alternatively, a pipe with a round cross-section, with both ends reduced in thickness by swaging, is used. It is being

0003

[Problem that the idea aims to solve]

However, with the conventional pipe with a round cross section, the specified space inside the door is Shock absorption within the chassis is small, and in order to meet the specified shock absorption capacity, the wall thickness must be increased or The outer diameter must be increased, which increases the weight and space within the door cross section. I get angry.

0004

[Means to solve the problem]

In order to solve the above problems, this invention has a square cross-section at the center of the impact door beam. It was formed into a shape, and both ends were formed to have a thin round cross-section within the dimension of the opposite side of the cross-sectional angle.

[0005]

[Effect]

Since the center part has a square cross-section, it has greater strength than a round shape, and both ends can be It is formed to have a thin wall with a round cross section within the dimension of the opposite side of the cross section angle, so it can be lightweight. , the space inside the door becomes more efficient.

[0006]

【Example】

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, Figure 1 is related to the present invention. Figure 2 is a cross-sectional view of the material of the impact door beam, Figure 3 is a perspective view of the impact door beam. Figure 4 is an explanatory diagram of the hardening process of the same beam, and Figure 5 is a cross-sectional view of the beam being drawn at both ends. Figure 6 is an explanatory diagram of the beam tempering process, and Figure 6 is an explanatory diagram of the central roll forming of the beam. 7 is an explanatory diagram of the central part roll forming, and Fig. 8 is an explanatory diagram of the central part press forming of the same beam. It is.

[0007] As shown in FIG. 1, the impact door beam 1 has a central portion 2 having a rectangular cross section. , both ends 3, 3 are formed into a thin round shape as shown in Fig. 3, and these ends are connected to a bracket. Fix it to the inside of the door panel through the bolt. In this way, the impact door beam 1 has a rectangular cross-section in the center part 2, so it has sufficient strength to withstand large impacts. In addition, since both end portions 3, 3 are thin, the weight can be reduced. In addition, both ends 3 and 3 are also square shaped. It can also be formed into

[0008] The method for manufacturing the above impact door beam 1 will be explained with reference to FIGS. 2 to 8. . First, using a round pipe 11 with a constant wall thickness as shown in Fig. 2, as shown in Fig. 3, After swaging both ends 13, 13 of the pipe 11 to make it thinner, As shown in FIG. 4, high-frequency heating is performed by the heating coil 14 while rotating the pipe 11. Then, cooling water is sprayed by the cooling water spray device 15 to perform quenching, as shown in FIG. Tempering is performed again using the heating coil 14 while rotating the pipe 11.

[0009] Thereafter, in a warm room, the central part 12 of the pipe 11 is rolled as shown in FIGS. 6 and 7. Rolling is performed using a roller 16 to form a rectangular cross-section. In addition, roll processing is applied. Instead, press processing is performed using a punch 17 as shown in FIG. 8(a) or (b). It may also be formed into a rectangular cross-sectional shape.

0010 In this way, drawing on both ends and induction hardening and tempering are performed on round pipes, and the Productivity is improved by forming the central part at warm temperatures in the ductility increasing range. This makes it possible to manufacture lightweight beams with high yield strength.

[0011]

[Effect of the idea]

As explained above, according to the present invention, the central part is formed into a square cross section, and both ends It is formed to have a thin wall with a round cross-section within the dimension of the opposite side of the cross-sectional angle, so it can withstand large impacts. The central part of the door has sufficient strength and is lightweight, making the space inside the door more efficient. becomes higher.

[Brief explanation of drawings]

[Fig. 1] A perspective view of an impact door beam according to the present invention

[Figure 2] Cross-sectional view of the material of the beam

[Figure 3] Cross-sectional view of the same beam drawn at both ends

[Figure 4] Explanatory diagram of the quenching process of the same beam

[Figure 5] Explanatory diagram of the tempering process of the same beam

[Fig. 6] Explanatory diagram of roll forming of the central part of the same beam

[Fig. 7] Explanatory diagram of the central roll forming

[Fig. 8] Explanatory diagram of press forming of the central part of the beam

[Explanation of symbols]

1... Impact door beam, 2... Center part, 3... Both ends,
16... Forming roll, 17... Punch.

Claims (1)

[Scope of utility model registration request] Claim 1: In an impact door beam disposed on the inside of an automobile door for shock absorption, the impact door beam has a central portion with a square cross section, and both ends with a round cross section within the dimension of the opposite side of the cross section angle. An impact door beam characterized by its thin shape.