JP2015147550A - Body structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the welding strength of weld zones of joint flanges of a roof panel and a roof arch without increasing the size nor the weight.SOLUTION: A joint flange 11b of a front end of a roof panel 11 and a joint flange 16d of a roof arch 15 are joined together through seam welding W1(a). Strength against mouth opening deformation of the joint flanges 11b, 16d of the roof panel 11 and roof arch 15 is high since a nugget width "w" of the seam welding W1(a) and a nugget diameter "d" of normal spot welding of an automobile body are so related that 0.29≤w/d≤0.36, and the same shearing strength with the normal spot welding can be obtained although the seam welding W1(a) which can reduce the weight by decreasing widths of the joint flanges 11b, 16d is employed. Further, the joint flanges 11b, 16d are joined together through the seam welding W1(a) while pressed one over the other with electrodes, so a gap between the joint flanges 11b, 16d is eliminated to stabilize the welding strength and the need for a special welding tool is eliminated to improve the productivity.

Description

  The present invention relates to a vehicle body structure for an automobile in which a joining flange at a front end or a rear end of a roof panel and a joining flange of a roof arch are joined by seam welding.

  In the case of a front pillar having a closed cross section by welding with a reinforcement between the flange of the outer panel and the flange of the inner panel, the flange of the outer panel and the flange of the inner panel are shifted and arranged. In addition to seam welding with two flanges and reinforcements, and seam welding with two flanges and reinforcements on the inner panel, it is possible to avoid three-layer seam welding to ensure welding strength. This is known from Patent Document 1 below.

JP 2009-255800 A

  By the way, in the above-mentioned conventional one, the seam welding that joins the flange and the reinforcement of the outer panel by two sheets and the seam welding that joins the flange and the reinforcement of the inner panel by two sheets are parallel to each other with a predetermined distance. Therefore, the widths of the flanges of the outer panel and the inner panel are inevitably increased, and not only the size of the welded portion is increased, but also the weight is increased by the increased width of the flange.

  The present invention has been made in view of the above circumstances, and an object thereof is to increase the welding strength without increasing the size and weight of the welded portion of the joint flange of the roof panel and the roof arch.

  To achieve the above object, according to the first aspect of the present invention, there is provided a vehicle body structure for an automobile in which a joint flange at a front end or a rear end of a roof panel and a joint flange of a roof arch are joined by seam welding. A vehicle body structure is proposed in which the relationship between the seam welding nugget width w and the normal spot welding nugget diameter d of the vehicle body is set to 0.29 ≦ w / d ≦ 0.36. .

  According to the second aspect of the present invention, in addition to the structure of the first aspect, both end portions of the seam welded portion of the joint flange at the front or rear end of the roof panel and the joint flange of the roof arch are spotted. A vehicle body structure is proposed in which the relationship between the nugget width w of the seam welding and the nugget diameter d of the spot welding is set to 0.29 ≦ w / d ≦ 0.36. .

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, the spot welding pitch is less than 30 mm, which is smaller than the normal spot welding pitch of the vehicle body. A vehicle body structure is proposed.

  According to the invention described in claim 4, in addition to the configuration of any one of claims 1 to 3, the width in the front-rear direction of the roof arch in the seam welded W1 portion is the spot welding. A vehicle body structure is proposed in which the width of the roof arch in the W2 portion is smaller than the width in the front-rear direction.

  According to the invention described in claim 5, in addition to the structure of any one of claims 1 to 4, the joining flange at the end in the vehicle width direction of the roof panel is the joining flange of the roof side rail. The relationship between the nugget width w of the seam welding and the nugget diameter d of normal spot welding of the vehicle body is set to 0.29 ≦ w / d ≦ 0.36. A structure is proposed.

  The front side joining flange 11b, the outer side joining flange 11d, the front side joining flange 16d and the inside joining flange 19a of the embodiment correspond to the joining flange of the present invention, and the front roof arch 15 of the embodiment corresponds to the roof arch of the present invention. Correspond.

  According to the configuration of the first aspect, the joining flange at the front end or the rear end of the roof panel and the joining flange of the roof arch are joined by seam welding. Since the relation between the seam welding nugget width w and the normal spot welding nugget diameter d of the vehicle body is set to 0.29 ≦ w / d ≦ 0.36, the opening deformation of the joint flange of the roof panel and the roof arch The shear strength equivalent to that of ordinary spot welding can be obtained while using seam welding which is high in strength and can be reduced in weight by reducing the width of the joint flange. In addition, seam welding is performed by applying pressure to the overlapped joint flanges with electrodes, which not only eliminates the gap between the joint flanges and stabilizes the welding strength, but also eliminates the need for a special welding jig, which increases productivity. improves.

  According to the construction of claim 2, both ends of the seam welded portion of the front flange or the rear flange of the roof panel and the joint flange of the roof arch are spot welded, and the seam weld nugget width w and the spot weld nugget are obtained. Since the relationship with the diameter d is set to 0.29 ≦ w / d ≦ 0.36, the joint flange of the roof panel and the roof arch is prevented from opening and deforming due to seam welding when a bending load is applied. In addition, since the joining flanges are joined by spot welding having higher peel strength than the seam welding at both ends of the seam welded portion, peeling at both ends of the seam welding can be prevented by spot welding.

  According to the third aspect of the present invention, since the spot welding pitch is less than 30 mm, which is smaller than the normal spot welding pitch of the vehicle body, it is possible to more reliably prevent peeling at both ends of the seam welding.

  According to the fourth aspect of the present invention, the width in the front-rear direction of the roof arch in the seam-welded portion is smaller than the width in the front-rear direction of the roof arch in the spot-welded portion. This makes it possible to reduce the weight of the vehicle body.

  According to the fifth aspect of the present invention, the joint flange at the end in the vehicle width direction of the roof panel is seam welded to the joint flange of the roof side rail, the seam weld nugget width w and the normal spot weld nugget diameter d of the vehicle body. Is set to 0.29 ≦ w / d ≦ 0.36, so the strength of the joint flange of the roof panel and roof side rail against opening deformation is high, and the width of the joint flange is reduced to reduce the weight. A shear strength equivalent to that of normal spot welding can be obtained while using seam welding capable of welding. In addition, seam welding is performed by applying pressure to the overlapped joint flanges with electrodes, which not only eliminates the gap between the joint flanges and stabilizes the welding strength, but also eliminates the need for a special welding jig, which increases productivity. improves.

The figure which compares the member which carried out seam welding, and the member which carried out spot welding. Explanatory drawing of the member which used seam welding and spot welding together. The perspective view of the roof front part of a motor vehicle. FIG. 4 is a four-direction arrow view of FIG. 3. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 3.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 (A) shows a member in which a pair of hat-shaped steel plates are seam welded in a state of being overlapped at their joint flanges to form a closed cross section, and FIG. 1 (B) is also spot welded. Shows things. The pitch of spot welding is 30 mm, which is generally used for welding of automobile bodies.

  When a bending moment is applied to this member, in the case of discrete spot welding, the gap between adjacent welds is easily deformed due to opening deformation, but in the case of continuous seam welding. Since there is no opening deformation, the bending strength is improved, the steel sheet can be made thinner and lighter, and the seam weld nugget width is smaller than the spot weld nugget diameter. Further reduction in weight can be achieved by reducing the width of the flange. On the other hand, when a peeling load is applied to the member, peeling is likely to occur from the weld end in the case of seam welding with a small nugget width, but peeling is unlikely to occur in spot welding with a large nugget diameter. .

  In addition, in order to obtain a shear strength equivalent to that of spot welding at intervals of 30 mm by seam welding, when the nugget width of seam welding is set to w and the diameter of nugget of general spot welding used for automobile body welding is set to d. Including the safety factor, it is necessary that 0.29 ≦ w / d ≦ 0.36 holds. If the seam welding nugget width w is too small and w / d is less than 0.29, the shear strength will be insufficient, and if the seam welding nugget width w is too large and w / d exceeds 0.36, the base metal That is, the steel material itself breaks.

  Therefore, as shown in FIG. 2, the center part in the longitudinal direction of the joining part of two steel materials is seam welded to increase the strength against bending load, and both ends of seam welding are spot welded to increase the strength against peeling load. The advantages of seam welding and spot welding can be achieved at the same time, and a member having high bending strength and high peel strength can be obtained while being lightweight. In addition, by setting the relationship between the nugget width w of seam welding and the nugget diameter d of spot welding to 0.29 ≦ w / d ≦ 0.36, general spot welding used for automobile body welding Equivalent shear strength can be ensured.

  Next, an embodiment to which the combination of seam welding and spot welding described above is applied will be described with reference to FIGS. In the present specification, the front-rear direction, the left-right direction (vehicle width direction), and the up-down direction are defined with reference to an occupant seated in the driver's seat.

  As shown in FIG. 3, the outer peripheral portion of the roof panel 11 of the automobile includes a pair of left and right roof side rails 14, 14 that respectively connect the upper ends of a front pillar 12, a center pillar 13, and a rear pillar (not shown), A front roof arch 15 that connects the front ends of the roof side rails 14 and 14 in the vehicle width direction, and a rear roof arch (not shown) that connects the rear ends of the left and right roof side rails 14 and 14 in the vehicle width direction. Supported.

  FIG. 4 is a view of a portion where the right end of the front roof arch 15 is connected to the front end of the right roof side rail 14 from the vehicle interior side. The front roof arch 15 is the roof arch main body portion 16 at the center in the vehicle width direction. And a pair of left and right roof arch connecting portions 17 and 17 that connect both ends in the vehicle width direction of the roof arch main body portion 16 to the roof side rails 14 and 14. Both the roof arch main body 16 and the roof arch connection part 17 are hat-shaped cross-section members that open upward, and are joined to the bottom walls 16a and 17a, the front walls 16b and 17b, the rear walls 16c and 17c, and the front side joints. The flanges 16d and 17d and the rear joint flanges 16e and 17e are provided. Further, an outer joint flange 17f that is continuous with the front joint flange 17d and the rear joint flange 17e is formed at the outer end of the roof arch connection portion 17 in the vehicle width direction.

  As shown in FIGS. 4-6, the vertical wall 11a bent downward is formed in the front end of the roof panel 11, and the front side joining flange 11b bent forward is formed in the lower end of the vertical wall 11a. At the vehicle width direction center portion of the roof panel 11, the front side joining flange 11b and the front side joining flange 16d of the roof arch main body portion 16 are overlapped in the vertical direction and joined by seam welding W1 (a), The lower surface of the roof panel 11 and the rear joining flange 16e of the roof arch main body 16 are overlapped in the vertical direction and joined by bonding G (a) (see FIG. 5).

  On the other hand, at both ends in the vehicle width direction of the roof panel 11, the front side joining flange 11b and the front side joining flange 17d of the roof arch connecting part 17 are overlapped in the vertical direction so as to overlap each other at a plurality of spot welds W2 (a ), The lower surface of the roof panel 11 and the rear joint flange 17e of the roof arch connecting portion 17 are overlapped in the vertical direction and joined together by the adhesive G (a). However, since the roof arch main body portion 16 outer end in the vehicle width direction and the inner end portion in the vehicle width direction of the roof arch connection portion 17 overlap each other, the front joint flange 11b of the roof panel 11 and the roof arch main body portion 16 are overlapped with each other. The front side joining flange 16d and the front side joining flange 17d of the roof arch connecting portion 17 are overlapped in the vertical direction and are joined by the spot welding W2 (a) (see FIG. 6).

  Further, the outer joint flange 17f at the outer end in the vehicle width direction of the roof arch connection portion 17 is joined to the inner surface in the vehicle width direction at the front end of the roof side rail 14 by spot welding W2 (b) (see FIG. 4). Then, the upper edge of the windshield 18 is joined to the upper surface of the front joining flange 11b of the roof panel 11 by bonding G (b) (see FIGS. 5 and 6).

  The width of the front roof arch 15 in the front-rear direction changes in the vehicle width direction, and the width A of the roof arch main body portion 16 at the center in the vehicle width direction is larger than the width B of the roof arch connecting portions 17 and 17 outside in the vehicle width direction. (See FIG. 4).

  As shown in FIGS. 4 and 7, the roof side rail 14 spot welds the inner joining flange 19a and the lower joining flange 19b of the outer panel 19 to the inner joining flange 20a and the lower joining flange 20b of the inner panel 20, respectively. Joined by W2 (c) to form a closed cross section. A vertical wall 11c bent downward is formed at the outer end in the vehicle width direction of the roof panel 11, and an outer joint flange 11d bent outward in the vehicle width direction is formed at the lower end of the vertical wall 11c. The inner joint flange 20a of the inner panel 20 is extended inward in the vehicle width direction with respect to the inner joint flange 19a of the outer panel 19, and the outer joint flange 11d of the roof panel 11 is overlapped in the vertical direction in two layers. Are joined by seam welding W1 (b).

  Then, at the front and rear end portions of the seam weld W1 (b), the inner joint flange 20a of the inner panel 20 and the outer joint flange 11d of the roof panel 11 are spot-welded W2 (d) by overlapping each other in the vertical direction.

  In the present embodiment, the nugget diameter d of each of the spot welds W2 (a) to W2 (d) is the same as the general nugget diameter d of spot welding of the vehicle body, and each of the seam welds W1 (a), W1. The nugget width w in (b) is set so that a relation of 0.29 ≦ w / d ≦ 0.36 is established with respect to the nugget diameter d. Moreover, although the pitch of general spot welding is 30 mm, the pitch of spot welding W2 (a) in the both ends of the seam welding W1 (a) of the front end of the roof panel 11 is less than 30 mm. It is set smaller than the pitch.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  The front joint flange 11b of the roof panel 11 and the front joint flange 16d of the roof arch body 16 of the front roof arch 15 are seam welded W1 (a), the nugget width w of the seam weld W1 (a) and the normal spot of the vehicle body Since the relationship with the welding nugget diameter d is set to 0.29 ≦ w / d ≦ 0.36, the strength of the front joint flanges 11b and 16d against opening deformation is high, and the width of the front joint flanges 11b and 16d is high. The shear strength equivalent to that of ordinary spot welding can be obtained while using seam welding W1 (a) that can be reduced in weight and reduced in weight.

  In addition, since the seam weld W1 (a) is welded while pressing the overlapped front joint flanges 11b and 16d with electrodes, not only the clearance between the front joint flanges 11b and 16d is eliminated and the welding strength is stabilized, but also a special weld. Productivity is improved because no welding jig is required.

  Further, both end portions in the vehicle width direction of the seam weld W1 (a) of the front joint flanges 11b and 16d in the vehicle width direction center portion of the front roof arch 15 are spot-welded W2 (a) and the nugget width of the seam weld W1 (a). Since the relationship between the w and the nugget diameter d of the spot weld W2 (a) is set to 0.29 ≦ w / d ≦ 0.36, it is bent to the front roof arch 15 by adhesion G (b) with the windshield 18. When the load is applied, the seam weld W1 (a) can prevent the roof arch main body 16 and the roof panel 11 from being deformed by opening, and the peeling strength at both ends of the seam weld W1 (a) can be prevented. Can be prevented by high spot welding W2 (a).

  Further, at the boundary between the roof arch main body 16 and the roof arch connecting portion 17, the front side joining flange 11 b of the roof panel 11, the front side joining flange 16 d of the roof arch main body portion 16 and the front side joining flange 17 d of the roof arch connecting portion 17 are overlapped. However, by spot welding W2 (a) that part, not only can both ends of seam weld W1 (a) be prevented from peeling, but it is not necessary to seam weld the overlapped part. It is not necessary to change the welding conditions for seam welding according to the welding site, and the quality of seam welding can be guaranteed.

  In particular, since the pitch of the spot welding W2 (a) is set to be less than 30 mm, which is smaller than the pitch of normal spot welding of the vehicle body, it is possible to more reliably prevent peeling at both ends of the seam welding W1 (a). it can. Further, the front-rear width A of the roof arch in the vehicle width direction central portion of the front roof arch 15 subjected to seam welding W1 (a) is the front-rear width B at both ends of the front roof arch 15 subjected to spot welding W2 (a) in the vehicle width direction. Therefore, the weight of the vehicle body can be reduced by setting the width in the front-rear direction of the front roof arch 15 according to the required strength.

  The seam welding W1 (a) at the front end of the roof panel 11 has been described above, but the seam welding W1 (b) for joining the outer end of the roof panel 11 in the vehicle width direction to the roof side rail 14 is also spotted at both ends thereof. By arrange | positioning welding W2 (d), the intensity | strength with respect to opening deformation which is the advantage of seam welding W1 (b), and the intensity | strength with respect to peeling which are the advantages of spot welding W2 (d) can be made compatible.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the welded portion between the front roof arch 15 and the roof panel 11 has been described, but the present invention can also be applied to the welded portion between the rear roof arch and the roof panel 11.

11 Roof panel 11b Front joint flange (joint flange)
11d Outer joint flange (joint flange)
14 Roof side rail 15 Front roof arch (roof arch)
16d Front joint flange (joint flange)
19a Inner joint flange (joint flange)
W1 (a) Seam welding W1 (b) Seam welding W2 (a) Spot welding

Claims (5)

A vehicle body structure for an automobile in which a joining flange (11b) at a front end or a rear end of a roof panel (11) and a joining flange (16d) of a roof arch (15) are joined by seam welding (W1 (a)).
The relationship between the nugget width w of the seam welding (W1 (a)) and the nugget diameter d of normal spot welding of a vehicle body is set to 0.29 ≦ w / d ≦ 0.36. Body structure.   Spot welding (W2 ()) is performed on both ends of a seam welded portion (W1 (a)) of the joint flange (11b) at the front or rear end of the roof panel (11) and the joint flange (16d) of the roof arch (15). a)), and the relationship between the nugget width w of the seam welding (W1 (a)) and the nugget diameter d of the spot welding (W2 (a)) is set to 0.29 ≦ w / d ≦ 0.36 The vehicle body structure according to claim 1, wherein the vehicle body structure is a vehicle.   The vehicle body structure according to claim 2, wherein a pitch of the spot welding (W2 (a)) is less than 30 mm, which is smaller than a pitch of normal spot welding of the vehicle body.   The width in the front-rear direction of the roof arch (15) in the seam welded W1 (a) portion is smaller than the width in the front-rear direction of the roof arch (15) in the spot welded W2 (a) portion. The vehicle body structure according to any one of claims 1 to 3.   The joint flange (11d) at the vehicle width direction end of the roof panel (11) is seam welded (W1 (b)) to the joint flange (19a) of the roof side rail (14), and the seam weld (W1 (b)). The relation between the nugget width w) and the nugget diameter d of normal spot welding of the vehicle body is set to 0.29 ≦ w / d ≦ 0.36. 2. A vehicle body structure according to claim 1.

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