JP2008162427A - Reinforcement structure for side member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcement structure for a side member capable of effectively preventing fragility of joint strength caused by generation of rust while ensuring required strength. <P>SOLUTION: Level difference parts 2A, 6A for reducing cross sections of non-release side space portions Ab, Bb than cross sections of release side space portions Aa, Ba in internal spaces A, B of a side member 1 or a reinforcement 5 are provided on each of a side wall 2 of the side member 1 and a side wall 6 of the reinforcement 5. Formation positions of the level difference parts 2A, 6A are set such that a superposition part 8 enabling welding of the side wall 2 of the side member 1 and the side wall 6 of the reinforcement 5 is formed between the level difference part 2A of the side member 1 and the level difference part 6A of the reinforcement 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes a pair of side members having a concave cross-sectional shape and extending in the front-rear direction of the vehicle, and a reinforcement having a concave cross-sectional shape and disposed inside the side member. The present invention relates to a side member reinforcing structure configured to reinforce the side member by welding a side wall and a pair of opposing side walls in the reinforcement.

As the side member reinforcement structure, a bulkhead (corresponding to reinforcement) is provided inside the side member in which the cross-sectional shape is substantially hat-like and the beat protruding upward on the bottom wall is formed. There is a structure in which the side members are reinforced by spot welding the both side walls and the beat of each side wall and the both side walls and the bottom surface of the bulkhead (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-132124 (paragraph numbers 0011 and 0014, FIGS. 1 to 6)

  In the reinforcing structure as described above, in order to ensure the required strength, it is necessary to increase the contact area between both side walls of the side member and both side walls of the bulkhead and the contact area between the beat of the side member and the bottom surface of the bulkhead. However, if the contact area is increased, there is a high risk that the electrodeposition coating liquid will not easily reach the entire contact surface in the electrodeposition coating process. There is a possibility that rust is generated and the bonding strength is weakened.

  The objective of this invention is providing the reinforcement structure of the side member which can prevent effectively weakening of the joint strength resulting from generation | occurrence | production of rust, ensuring required strength.

  In order to achieve the above object, the present invention includes a side member having a concave cross-sectional shape and extending in the front-rear direction of the vehicle, and a reinforcement having a concave cross-sectional shape and disposed inside the side member. In the reinforcing structure of a side member configured to reinforce the side member by welding a pair of side walls facing each other in the side member and a pair of side walls facing each other in the reinforcement, Each of the side wall and the side wall of the reinforcement is provided with a stepped portion that makes the cross-sectional area of the open side space portion smaller than the cross-sectional area of the open side space portion in the internal space of the side member or the reinforcement. , The formation position of the stepped portion, the stepped portion of the side member and the stepped portion of the reinforcement Between, wherein the polymerization unit which enables welding of side members said side wall between said side walls of said reinforcement has been set as being formed.

  According to this characteristic configuration, after welding the overlapping portion of the side member side wall and the reinforcement side wall and then closing the open side thereof, a closed cross-sectional structure having a plurality of closed cross sections can be obtained. The strength of the member can be effectively increased.

  And since this strength increase is due to the closed cross-sectional structure having a plurality of closed cross-sections, the overlapped portion which is the welded portion between the side member and the reinforcement is small enough to enable welding thereof. What is necessary is just to have a superposition | polymerization area, and it becomes easy to spread an electrodeposition coating liquid to the whole superposition | polymerization surface, and generation | occurrence | production of the rust resulting from the application | coating defect of an electrodeposition coating liquid can be prevented effectively.

  Moreover, each step portion of the side member and the reinforcement is made to have a cross-sectional area of the non-open side space portion smaller than the cross-sectional area of the open side space portion in the internal space of the side member or the reinforcement, in other words, facing each other. Since the separation distance on the side opposite to the opening side (closed side) is made smaller than the separation distance on the opening side in the side wall, each of the side member and the reinforcement can be easily formed by press molding.

  Accordingly, it is possible to effectively prevent weakening of the bonding strength due to the occurrence of rust due to poor application of the electrodeposition coating liquid while ensuring the required strength without causing a decrease in formability.

  Hereinafter, the reinforcing structure of the side member 1 according to the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of the main part showing the reinforcing structure of the side member 1 extending in the front-rear direction of the vehicle, and FIG. 2 is a longitudinal front view of the main part showing the reinforcing structure of the side member 1. As shown, the side member 1 includes a pair of opposing left and right side walls 2, a bottom wall 3 extending over the side walls 2, a flange 4 extending outwardly from the upper end of each side wall 2, and the like. The reinforcement 5 is arranged in the inside of the concave shape having a cross section.

  The reinforcement 5 is press-molded into a concave cross-sectional shape including a pair of left and right side walls 6 facing each other and a bottom wall 7 extending over the side walls 6.

  On each side wall 2 of the side member 1, a step portion 2 </ b> A is formed that makes the cross-sectional area of the anti-open side space portion Ab smaller than the cross-sectional area of the open side space portion Aa in the internal space A of the side member 1.

  That is, each side wall 2 of the side member 1 has a step portion 2A facing left and right, an upper wall portion 2B extending upward from the outer end of the step portion 2A, and downward from an inner end of the step portion 2A. It is bent and formed into a cross-sectional crank shape having a lower wall portion 2C that extends.

  On each side wall 6 of the reinforcement 5, a step portion 6 </ b> A is formed that makes the cross-sectional area of the anti-opening side space portion Bb smaller than the cross-sectional area of the opening-side space portion Ba in the internal space B of the reinforcement 5. .

  That is, each side wall 6 of the reinforcement 5 has a step portion 6A facing left and right, an upper wall portion 6B extending upward from the outer end of the step portion 6A, and downward from the inner end of the step portion 6A. It is bent and formed into a crank shape in cross section having a lower wall portion 6C that extends.

  The step portions 2A and 6A of the side member 1 and the reinforcement 5 are arranged between the opposing side members 1 between the step portions 2A and 6A in a state in which the reinforcement 5 is provided inside the side member 1. The formation positions thereof are set so that the overlapping portion 8 that enables welding of the side wall 2 and the side wall 6 of the reinforcement 5 is formed.

  When the reinforcement 5 is arranged at a predetermined position inside the side member 1 from the above configuration, the side wall 2 of the corresponding side member 1 and the side wall 6 of the reinforcement 5 face each other, and Clearances 9 and 10 are formed between the upper wall portions 2B and 6B and between the lower wall portions 2C and 6C, respectively, and an upper end portion of the lower wall portion 2C in the side member 1 and an upper wall portion in the reinforcement 5 The overlapping portion 8 is formed by overlapping the lower end portion of 6B.

  Then, when each overlapped portion 8 is spot welded and then each flange 4 of the side member 1 is spot welded to the floor panel 11, a closed cross-sectional structure having four closed cross sections C1 to C4 at the left and right side portions of the floor panel 11. Thus, the side member 1 can be effectively reinforced and the necessary strength can be ensured.

  In addition, since the required strength is ensured with the above-described closed cross-sectional structure, the overlapping length in the vertical direction of the overlapping portion 8 that is a welded portion between the side member 1 and the reinforcement 6 is set to the side wall 2 of the side member 1. It can be set to a length that is short enough to allow welding to the side wall 6 of the reinforcement 5, which makes it easier for the electrodeposition coating liquid to spread over the entire polymerization surface in the electrodeposition coating process. It is possible to effectively prevent the occurrence of rust due to poor application of the coating liquid, and it is possible to effectively prevent weakening of the bonding strength due to the occurrence of rust.

  Moreover, each step 2A of the side member 1 has a spacing distance between the upper wall portions 2B larger than a spacing distance between the lower wall portions 2C in the left and right side walls 2 facing each other. Since each of the step portions 6A in FIG. 5 has the left and right side walls 6 opposed to each other, the distance between the upper wall portions 6B is larger than the distance between the lower wall portions 6C. The deterioration of the moldability of the side member 1 and the reinforcement 5 due to the provision can be avoided.

    [Another embodiment]

[1] The step portions 2A and 6A may be formed on the pair of side walls 2 and 6 facing each other in the side member 1 and the reinforcement 5 in a state where the formation positions are different.

[2] A plurality of steps 2A, 6A may be formed on the side walls 2, 6 of the side member 1 and the reinforcement 5 respectively.

[3] The step portions 2A and 6A may be intermittently formed on the side walls 2 and 6 of the side member 1 and the reinforcement 5 along the longitudinal direction of the side member 1 and the reinforcement 5. .

[4] You may make it form the protrusion which protrudes toward the bottom face 3 and 7 which opposes in any one or both of the bottom wall 3 of the side member 1, and the bottom wall 7 of the reinforcement 5. FIG.

[5] The reinforcement 5 may be provided with a flange extending from the upper end of each side wall 6 toward the left and right outwards.

[6] The side member 1 and the reinforcement 5 may be arranged in a posture in which one of the left and right sides thereof is opened, and the opened side may be closed by a panel other than the floor panel 11. .

The exploded perspective view of the principal part showing the reinforcement structure of a side member Longitudinal front view showing side member reinforcement structure

Explanation of symbols

1 Side member 2 Side wall (side member)
2A Stepped part (side member)
5 Reinforcement 6 Side wall (Reinforcement)
6A Stepped part (reinforcement)
8 Superposition part A Internal space (side member)
Aa Open side space (side member)
Ab Non-open side space (side member)
B Internal space (reinforcement)
Ba Open side space (reinforcement)
Bb Anti-opening side space (reinforcement)

Claims (1)

A side member having a concave cross-sectional shape and extending in the longitudinal direction of the vehicle; and a reinforcement having a concave cross-sectional shape and disposed inside the side member;
A side member reinforcing structure configured to reinforce the side member by welding a pair of opposing side walls in the side member and a pair of opposing side walls in the reinforcement,
Each of the side wall of the side member and the side wall of the reinforcement has a cross-sectional area of the non-open side space portion smaller than a cross-sectional area of the open side space portion in the internal space of the side member or the reinforcement. Provide a step,
The side wall of the side member and the side wall of the reinforcement can be welded between the stepped part of the side member and the stepped part of the reinforcement. A side member reinforcing structure, characterized in that it is set so as to form an overlapping portion.

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