JP2004203116A - Joint structure of frame members of vehicle body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a joint structure of frame members of a vehicle body capable of improving a sealing property at a joint part while securing both of mass production and joint rigidity. <P>SOLUTION: A notch part 28 for preventing cracks at the time of press molding is formed at an end outside a folded part, where a top vertical face 22 and an intermediate horizontal face 26 of a rear cross member 12 are crossed with each other, while a step part 30 is formed for narrowing a notch range of the notch part 28. This can secure mass production by preventing cracks, and facilitate sealing of the notch part 28 with a seal material. An intermediate terminal flange part 26A of the intermediate horizontal face 26 extends from a general face 26B as it is, and is spot-welded to a bottom horizontal face 16 of a rear side member 10 at the same height, so as to secure joint rigidity. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is formed by press forming and includes a vertical plane and a horizontal plane, and is rigidly connected by welding in a state where the end of the other vehicle body frame member abuts against the side surface of one vehicle body frame member. The present invention relates to a connection structure between vehicle body frame members.
[0002]
[Prior art]
Generally, a vehicle body is configured by combining various body panels, and typical frame members include side members and cross members. The side member is a long member arranged on the side of the vehicle body with the longitudinal direction of the vehicle body as the longitudinal direction, and the cross member is a long member arranged on the longitudinal section of the vehicle body with the longitudinal direction of the vehicle body in the longitudinal direction. . The end of the cross member is connected to the inside of the side member by spot welding.
[0003]
FIGS. 6 and 7 show a conventional example of a connection structure between a rear side member and a rear cross member. As shown in these figures, the rear cross member 100 is formed in a step shape, and includes an upper vertical surface 102, a middle horizontal surface 104, and a lower vertical surface 106. The terminal flange portion 102A of the upper vertical surface 102 is bent toward the front side of the vehicle body, and is connected to the side vertical surface 110 of the rear side member 108 by spot welding. The intermediate end flange portion 104A of the intermediate horizontal surface 104 extends toward the lower horizontal surface 112 of the rear side member 108, and is directly connected to the lower horizontal surface 112 by spot welding. The lower end flange portion 106A of the lower vertical surface 106 is bent rearward of the vehicle body, and is connected to another member different from the rear side member 108 by spot welding.
[0004]
Here, the rear cross member 100 and the rear side member 108 described above are generally formed by press molding from the viewpoint of mass productivity. In this case, since it is necessary to prevent a crack from being generated at the end of the bent portion at the time of molding, the outer end of the bent portion where the upper vertical surface 102 of the rear cross member 100 intersects with the intermediate horizontal surface 104 has U A letter-shaped notch 114 is formed. Then, from the viewpoint of securing strength and rigidity, the height of the middle horizontal surface 104 of the rear cross member 100 is set to match the height of the lower horizontal surface 112 of the rear side member 108. The corner R portions 116 of the rear side member 108 fit together, and as a result, as shown in FIG. 7, a relatively large gap 118 is formed between the cutout portion 114 and the corner R portion 116, and it is very difficult to seal with the sealant. Had become something.
[0005]
As a result of the prior art investigation, Patent Literature 1 below was extracted, but in the case of this coupling structure, a step was formed at the end of the cross member, and the lower surface of the cross member was spot-welded directly to the lower surface of the side member. The strength and rigidity of the joint cannot be ensured because there is no structure, and the notch itself does not exist.However, it is said that this panel is not suitable for mass production because cracking will occur if pressed for mass production purposes. There are drawbacks.
[0006]
[Patent Document 1]
JP-A-2-145569
[Problems to be solved by the invention]
The present invention has been made in consideration of the above-described circumstances, and has as its object to obtain a joint structure between vehicle body frame members that can improve sealing performance at a joint portion while ensuring both mass productivity and joint rigidity.
[0008]
[Means for Solving the Problems]
The joint structure of the vehicle body frame members according to the present invention according to claim 1 is formed by press molding and includes a vertical surface and a horizontal plane, respectively, and a side surface of one vehicle body frame member and a side surface of the other vehicle body frame member. A body frame member that is rigidly connected by welding in a state where the end portions of the vehicle body frame member are welded, and a terminal flange portion of a vertical surface of the other vehicle body frame member is positioned on a side surface of one vehicle body frame member. While welding to the vertical surface, the terminal flange portion directly extended from the horizontal surface of the other body frame member is welded from below to the horizontal surface located on the lower surface of one body frame member, and At the joint end of the bent portion where the vertical plane and the horizontal plane intersect, a cutout is formed to prevent the occurrence of cracks due to bending at the time of press molding, and the cutout projects toward the cutout. Stepped portions narrowing the deletion range is formed, it is characterized in that.
[0009]
According to a second aspect of the present invention, there is provided a joint structure between the vehicle body frame members according to the first aspect, wherein the one vehicle body frame member is disposed on a vehicle body side portion with the vehicle body longitudinal direction being a longitudinal direction. The other body frame member is a cross member that is disposed with the vehicle body width direction as a longitudinal direction and an end in the longitudinal direction is coupled to a side portion of a side member.
[0010]
According to the first aspect of the present invention, one of the vehicle body frame members is connected to the other vehicle body frame member as follows.
[0011]
First, the terminal flange portion on the vertical surface of the other vehicle body frame member is welded to the vertical surface located on the side surface of the one vehicle body frame member. Next, the terminal flange portion extending as it is from the horizontal plane of the other body frame member is welded from below to the horizontal plane located on the lower surface of the one body frame member. In addition, which welding operation is performed first is optional.
[0012]
Here, in the present invention, since the notch is formed near the joint end of the bent portion where the vertical plane and the horizontal plane of the other vehicle body frame member intersect, press forming is performed to manufacture the other vehicle body frame member. Thus, when the vertical plane is bent with respect to the horizontal plane, it is possible to prevent the occurrence of cracks due to the bending. Therefore, mass productivity can be ensured.
[0013]
However, since one body frame member is formed by press molding similarly to the other body frame member, the bent portion between the vertical surface serving as the side surface and the horizontal surface serving as the lower surface becomes an R portion having a predetermined radius of curvature. Therefore, simply forming a notch at a predetermined position of the other body frame member increases the notch area where the notch and the R portion overlap. For this reason, it can be said that it is very difficult to seal all of the notch area with the sealing material.
[0014]
Here, in the present invention, a stepped portion is formed in the vicinity of the joint end of the bent portion where the vertical plane and the horizontal plane of the other vehicle body skeleton intersect to project toward the cutout side and narrow the cutout range. The range is narrowed (that is, the notch area needs to be small). Therefore, even with the conventional sealing method, it is possible to reliably (and easily) seal.
[0015]
Moreover, in the present invention, a step is formed only near the joint end of the bent portion where the vertical plane and the horizontal plane of the other body frame member intersect, and the end of the horizontal plane of the other body frame member is extended as it is. The lower part of the vehicle body skeletal member is welded from below to the horizontal plane that is the lower surface of one body frame member. Can be. Therefore, the connection strength and the connection rigidity of the other vehicle body frame member to one vehicle body frame member are sufficiently ensured.
[0016]
According to the second aspect of the present invention, a longitudinal end of a cross member disposed on a side of the vehicle body with the longitudinal direction of the vehicle body extending in the longitudinal direction of the vehicle body. The invention described in claim 1 is applied to the case where. Generally, since a vehicle body is mass-produced, there is also a demand for ensuring the mass productivity of the side members and the cross members that are the frame members. In addition, the joint between the side member and the cross member is required to secure the joint rigidity in order to secure the safety in the event of a collision. There is also a request. Therefore, it is preferable to apply the invention described in claim 1 to a joint structure between a side member and a cross member.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a joint structure between vehicle body frame members according to the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates a front side of the vehicle body, an arrow UP indicates an upper side of the vehicle body, and an arrow IN indicates an indoor side in the vehicle width direction.
[0018]
FIG. 1 is an enlarged perspective view of a main part of a coupling structure of a rear side member and a rear cross member according to the present embodiment. 2 to 4 show cross-sectional views of each part.
[0019]
As shown in FIG. 1, a pair of rear side members 10 as one "one body frame member" having a longitudinal direction in the vehicle front-rear direction are disposed on both sides of the rear portion of the vehicle body. A rear cross member 12 as the “other vehicle body skeleton member” having the vehicle body width direction as a longitudinal direction is provided so as to be bridged between them.
[0020]
The rear side member 10 has a substantially U-shaped cross-sectional shape in which the outer side in the vehicle width direction is an open side, and an upper horizontal plane 14 and a lower horizontal plane 16 that are vertically arranged in parallel with each other. Connecting side vertical surface 18. The rear side member 10 is formed by press molding, so that the upper and lower bent portions are R portions 20 having a predetermined radius of curvature.
[0021]
On the other hand, the rear cross member 12 has a step-like cross-sectional shape, and includes an upper vertical surface 22 and a lower vertical surface 24 which are arranged alternately and vertically in parallel and a lower end portion of the upper vertical surface 22 and a lower vertical surface. And an intermediate horizontal surface 26 that connects the upper end of the H.24. Further, a terminal portion outside the upper vertical surface 22 is bent at a right angle to the front side of the vehicle body to form an upper terminal flange portion 22A. Similarly, a terminal portion of the lower vertical surface 24 is bent at a right angle to the rear side of the vehicle body to form a lower terminal flange portion 24A. On the other hand, the end portion of the middle horizontal surface 26 extends outward in the vehicle width direction as it is, and is formed as a middle end flange portion 26A.
[0022]
The upper terminal flange portion 22A is abutted against the side vertical surface 18 of the rear side member 10 and is connected (rigidly connected) by spot welding in this state. The intermediate end flange portion 26A is in contact with the lower surface of the lower horizontal surface 16 of the rear side member 10 from below, and is joined (rigidly connected) by spot welding in this state. Further, the lower terminal flange portion 24A is connected (rigidly connected) to a vehicle-side component (not shown) different from the rear side member 10 by spot welding.
[0023]
The above-mentioned rear cross member 12 is also formed by press molding. Therefore, in order to avoid cracks during press forming, the vicinity of the outer end of the bent portion between the upper vertical surface 22 and the middle horizontal surface 26 (more specifically, the lower end of the outer end of the upper vertical surface 22 near the lower end) ) And cutouts 28 are formed near the outer end of the bent portion between the intermediate horizontal surface 26 and the lower vertical surface 24 (more specifically, near the upper end of the outer end of the lower vertical surface 24). ing.
[0024]
Further, near the end of the bent portion between the upper vertical surface 22 and the intermediate horizontal surface 26 and near the end of the bent portion between the intermediate horizontal surface 26 and the lower vertical surface 24, a relatively narrow width in plan view is provided. Step portions 30 are respectively formed. The step portion 30 has a shape that protrudes upward from the general surface 26B of the middle horizontal surface 26, and thereby the cutout range of the cutout portion 28 is narrowed (see FIGS. 2 and 3). The outer end of the step portion 30 is inclined in a slope shape, extends to the lower surface side of the lower horizontal surface 16 of the rear side member 10, and is integrated with the intermediate terminal flange portion 26A. Then, the cutout portion 28 having the cutout range narrowed is sealed by a sealing material (not shown).
[0025]
Further, the step portion 30 is not formed over the entire width (width along the vehicle front-rear direction) of the middle horizontal surface 26 of the rear cross member 12, but is formed only on both sides. Is formed, the height h1 of the upper vertical surface 26 of the rear cross member 12 from the upper end flange portion 22B (see FIG. 2) does not reach (below) the lower edge of the lower horizontal surface 16 of the rear side member 10. However, the height h2 to the lower edge of the lower horizontal surface 16 of the rear side member 10 on the general surface 26B on which the step portion 30 is not formed is the same as the conventional height.
[0026]
Next, the operation and effect of the present embodiment will be described.
[0027]
First, although the rear cross member 12 is formed by press molding, the rear cross member 12 of the present embodiment is near the outer end of the bent portion between the upper vertical surface 22 and the middle horizontal surface 26 (more specifically, Near the lower end of the outer end of the upper vertical surface 22), and near the outer end of the bent portion between the intermediate horizontal surface 26 and the lower vertical surface 24 (more specifically, the outer end of the lower vertical surface 24). Since the notches 28 are formed in the vicinity of the upper end of the bent portion, it is possible to prevent cracks from being generated at the outer ends of these bent portions during press forming. Therefore, mass productivity can be ensured.
[0028]
In addition, since the rear side member 10 is also formed by press molding, a bent portion between the side vertical surface 18 and the lower horizontal surface 16 (and a bent portion between the side vertical surface 18 and the upper horizontal surface 14) has an R of a predetermined radius of curvature. It becomes the part 20. Therefore, simply forming the cutout portion 28 at the outer end of the bent portion of the rear cross member 12 increases the cutout range where the cutout portion 28 and the R portion 20 overlap, and it is difficult to seal with the sealing material. Although it becomes difficult, in the present embodiment, a step portion 30 protruding toward the notch portion 28 is integrally formed at the outer end of the bent portion where the upper vertical surface 22 of the rear cross member 12 intersects with the intermediate horizontal surface 26. Because of the formation, the formation (cutout) range of the cutout portion 28 can be narrowed at the portion where the step portion 30 is formed. That is, the notch area can be small. Therefore, even with the conventional sealing method, it is possible to reliably and easily seal.
[0029]
Moreover, in the present embodiment, the outer end of the bent portion where the upper vertical surface 22 of the rear cross member 12 intersects with the intermediate horizontal surface 26 and the bent portion where the intermediate horizontal surface 26 intersects with the lower vertical surface 24 are formed. The step portion 30 is formed only on the outer end side, the general portion 26B of the middle horizontal surface 26 is left as it is, and the outer end is extended as it is to the rear side member 10 side to form the middle end flange portion 26A as the middle side flange portion 26A. Since the lower horizontal surface 16 is spot-welded from below, the height of the intermediate horizontal surface 26 of the rear cross member 12 and the lower horizontal surface 16 of the rear side member 10 can be made uniform. Therefore, the connection strength and rigidity of the rear cross member 12 to the rear side member 10 are sufficiently ensured.
[0030]
In summary, according to the joint structure of the rear side member and the rear cross member according to the present embodiment, it is possible to improve the sealing performance at the joint portion while ensuring both mass productivity and joint rigidity.
[0031]
Further, in the present embodiment, since the present invention is applied to the connection structure of the rear side member 10 and the rear cross member 12, the above-described effects are fully exhibited. That is, since the vehicle body is generally mass-produced, there is also a demand for ensuring the mass productivity of the rear side member 10 and the rear cross member 12 as the frame members. In addition, the joint between the rear side member 10 and the rear cross member 12 is required to secure the joint rigidity in order to ensure safety during a collision. There is also a demand for ensuring the nature. Therefore, the above effects are fully exhibited, and this is a very preferable application example.
[0032]
In the above-described embodiment, the present invention is applied to the connection structure between the rear side member 10 and the rear cross member 12, but the invention is not limited to this, and may be applied to the connection structure between the front side member and the front cross member. The present invention may be applied, or the present invention may be applied to a connection structure between a rocker and a center cross member. Furthermore, if it is a portion where one body frame member and the other body frame member are joined, and a portion where a sealing problem occurs in relation to a notch provided for preventing cracking during press molding, The present invention is all applicable.
[0033]
Further, in the above-described embodiment, the configuration is adopted in which the longitudinal end of the rear cross member 12 is coupled to the side of the rear side member 10 having a U-shaped cross section in which the outside in the vehicle width direction is open. The present invention is not limited to this, and a configuration may be adopted in which the longitudinal end of the rear cross member 12 is coupled to the indoor side of the rear side member having a U-shaped cross section whose upper side is the open side. Similarly, in the present embodiment, the rear cross member 12 formed in a step shape is adopted, but a rear cross member having a U-shaped cross section in which the upper side of the vehicle body is open side may be used.
[0034]
Next, another embodiment will be disclosed with reference to FIG. As shown in FIG. 5, in this embodiment, a cutout is not formed at the outer end of the bent portion between the upper vertical surface 42 of the rear cross member 40 and the intermediate horizontal surface 44, and instead, the upper vertical surface 42 is not formed. By setting a relatively large R portion 46 at the bent portion between the general surface 42A and the upper terminal flange portion 42B, the occurrence of cracks during press forming is prevented. In the case of this embodiment, there is no need to set a notch, so there is no need to worry about sealing. However, since a relatively large R portion 46 needs to be set, it is not suitable for mass production, and the characteristics of a one-piece product become strong.
[0035]
【The invention's effect】
As described above, the connecting structure of the vehicle body frame members according to the present invention according to the first aspect of the present invention provides a vertical structure in which the terminal flange portion of the vertical surface of the other vehicle body frame member is positioned on the side surface of one vehicle body frame member. At the same time, the terminal flange portion directly extended from the horizontal plane of the other body frame member is welded from below to the horizontal plane located on the lower surface of one body frame member, and the vertical surface of the other body frame member In the vicinity of the joint end of the bent portion that intersects with the horizontal plane, a notch portion is formed to prevent the occurrence of cracks due to bending during press molding, and a step portion that protrudes toward the notch portion side and narrows the notch range is formed. Therefore, there is an excellent effect that it is possible to improve the sealing performance at the joint portion while ensuring the mass productivity and the joint rigidity at the same time.
[0036]
According to a second aspect of the present invention, there is provided a joint structure between the vehicle body frame members according to the first aspect, wherein one of the vehicle body frame members is a side member disposed on a vehicle body side portion with the vehicle body longitudinal direction being a longitudinal direction. The other body frame member is a cross member which is disposed with the vehicle body width direction as a longitudinal direction and whose longitudinal end is joined to a side portion of the side member, so that the effects of claim 1 are fully exhibited. It has an excellent effect.
[Brief description of the drawings]
FIG. 1 is an enlarged perspective view of a main part showing a coupling structure of a rear side member and a rear cross member according to the present embodiment.
FIG. 2 is a sectional view taken along line 2-2 of FIG.
FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;
FIG. 4 is a sectional view taken along line 4-4 of FIG. 1;
FIG. 5 is a schematic perspective view corresponding to FIG. 1 showing a disclosure example.
FIG. 6 is an enlarged perspective view of a main part corresponding to FIG. 1 and showing a coupling structure of a rear side member and a rear cross member according to a conventional example.
FIG. 7 is a cross-sectional view corresponding to FIG. 2 for describing a problem of the conventional example.
[Explanation of symbols]
10 Rear side member (one skeleton member)
12 Rear cross member (other skeletal member)
14 Upper horizontal surface 16 Lower horizontal surface 18 Side vertical surface 22 Upper vertical surface 22A Upper terminal flange portion 24 Lower vertical surface 26 Middle horizontal surface 26A Middle terminal flange portion 28 Notch portion 30 Step portion

Claims (2)

Vehicle body skeleton members which are formed by press molding and each include a vertical plane and a horizontal plane, and are rigidly connected by welding in a state where an end of the other vehicle body skeleton member is abutted against a side surface of one of the vehicle body skeleton members. The bonding structure of
While welding the terminal flange portion of the vertical surface of the other vehicle body frame member to the vertical surface located on the side surface of the one vehicle body frame member, the terminal flange portion directly extended from the horizontal plane of the other vehicle body frame member is connected to one side. Weld from below to the horizontal plane located on the lower surface of the body frame member of
At the joint end of the bent portion where the vertical plane and the horizontal plane of the other body frame member intersect, a cutout is formed to prevent the occurrence of cracks due to bending at the time of press forming, and the cutout is formed. A step is formed that projects to the side and narrows the notch range,
A connection structure between vehicle body frame members. The one body frame member is a side member arranged on the vehicle body side portion with the vehicle body front-rear direction being a longitudinal direction,
The other vehicle body frame member is a cross member that is disposed with the vehicle body width direction as a longitudinal direction and an end in the longitudinal direction is coupled to a side portion of the side member.
The connecting structure of the vehicle body frame members according to claim 1, characterized in that:

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