JP6137690B2 - Auto body structure - Google Patents

Description

  The present invention relates to a vehicle body structure for an automobile in which a door opening of a vehicle body is formed by seam welding an outdoor outer panel and an indoor inner panel with a joint flange.

  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 between the outer panel and the inner panel constituting the door opening of the vehicle body. .

In order to achieve the above object, according to the first aspect of the present invention, there is provided an automobile in which a door opening of a vehicle body is formed by seam welding an outer panel on the outdoor side and an inner panel on the indoor side with a joint flange. a vehicle body structure, front Symbol sandwiching a bracket for supporting the door lock striker between the outer panel and the inner panel, the outer panel, seams and an intermediate portion of the bracket and the portion where the inner panel becomes 3 ply A vehicle body structure for an automobile is proposed which is welded and spot welded at both ends of the seam welded portion of the three-layered portion .

According to the second aspect of the present invention, in addition to the configuration of the first aspect , the inner panel is disposed below the bracket, the lower first inner panel, and the bracket is disposed between the outer panel and the inner panel. in divided into a second inner panel of the upper sandwiching, the first inner panel, together with the second inner panel and the outer panel is spot-welded portions becomes 3 ply, adjacent to this spot welding For seam welding a portion where the first inner panel and the outer panel are overlapped, and spot welding on the upper side in the portion where the outer panel, the bracket and the second inner panel are overlapped. that a portion adjacent to the second inner panel and the outer panel is a two-ply seam welding Body structure of a motor vehicle is proposed to the butterflies.

According to the invention described in claim 3 , in addition to the configuration of claim 2 , the spot welding of the portion where the first inner panel, the second inner panel, and the outer panel are stacked three times In addition, with the seam welding of the portion where the first inner panel and the outer panel are overlapped, the portion where the first inner panel and the outer panel are overlapped is spot-welded, The upper spot welding of the portion where the outer panel, the bracket and the second inner panel are overlapped, and the seam welding of the portion where the second inner panel and the outer panel are overlapped, between, especially that part of the second inner panel and the outer panel is a two ply was spot-welded Body structure of a vehicle is proposed to be.

  Note that the first inner panel 14 and the second inner panel 15 of the embodiment correspond to the inner panel of the present invention.

According to the configuration of the first aspect, the door opening of the vehicle body is configured by seam welding and spot welding of the outdoor outer panel and the indoor inner panel at the joint flange . Sandwiching a bracket for supporting the door lock striker between A Utapaneru and inner panel became the outer panel, a middle portion of the portion bracket and the inner panel becomes 3 ply with seam welding, to the 3-ply portion Since both ends of the seam welded part of the door are spot welded, the rigidity of the door opening around the door lock striker is increased, and the bracket that supports the door lock striker to which a heavy load is applied is combined with seam welding and spot welding. Can be firmly fixed.

According to the second aspect, the inner panel below said bracket, and divided into a first inner panel lower, the bracket and the upper side of the second inner panel sandwiched between the outer panel, the first inner panel, seam with the second inner panel and the outer panel is spot welded became part 3 ply, a portion where the first inner panel and outer panel adjacent to the spot welding becomes two-ply Welded and seam welded the portion where the second inner panel and the outer panel overlapped adjacent to the upper spot weld in the portion where the outer panel, bracket and the second inner panel overlapped three So, the peeling of the seam welded end of the first inner panel and the outer panel and the second inner panel A release end of the seam welding of the outer panel and can be blocked by the spot welding portions became 3 ply. In addition, since it is not necessary to seam weld the overlapped portion, 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 .

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 vehicle body side view. 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 in FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG.

  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, a door opening 11 of the front door and a door opening 12 of the rear door are formed on the side surface of the vehicle body. The door openings 11 and 12 of the front door and the rear door have upper sides 11a and 12a, lower sides 11b and 12b, front sides 11c and 12c, and rear sides 11d and 12d, respectively. Hereinafter, the welding structure of the joining flange of the rear side 12d of the door opening 12 of the rear door will be described as a representative.

  As shown in FIG. 4, the periphery of the rear side 12 d of the door opening 12 of the rear door includes a joint flange 13 a of the outer panel 13 on the vehicle width direction outer side (outdoor side) and a first inner on the vehicle width direction inner side (inner side). The joining flanges 14a and 15a of the panel 14 and the second inner panel 15 are overlapped and welded.

  As shown in FIGS. 4 and 5, at the lower part of the rear side 12d of the door opening 12 of the rear door, the joining flange 13a of the outer panel 13 and the joining flange 14a of the first inner panel 14 are overlapped and overlapped, and seam welding is performed. Welded continuously by W1 (a). The upper end of the seam weld W1 (a) is spot-welded W2 (a) in a state where the joint flanges 13a and 14a are overlapped, and the lower end of the seam weld W1 (a) is the joint flanges 13a and 14a. Are spot-welded W2 (b) in a state where two sheets are stacked.

  As shown in FIGS. 4 and 6, at the center of the rear side 12 d of the door opening 12 of the rear door, the joining flange 13 a of the outer panel 13, the joining flange 14 a of the first inner panel 14, and the joining flange of the second inner panel 15. 15a is piled up by 3 sheets, and two places are spot-welded W2 (c).

  As shown in FIGS. 4 and 7, an L-shaped bracket 16 is provided between the joint flange 13 a of the outer panel 13 and the joint flange 15 a of the second inner panel 15 at the upper portion of the two spot welds W <b> 2 (c). The first plate-like portion 16a is sandwiched, and the center portion thereof is seam welded W1 (b) in a stack of three sheets, and both ends of the seam weld W1 (b) are spot-welded W3 ( d), W2 (e). Two weld nuts 17, 17 are fixed to the back surface of the second plate-like portion 16 a of the bracket 16, and two bolts 19, 19 that pass through the door lock striker 18 are screwed into the weld nuts 17, 17. By doing so, the door lock striker 18 is fixed to the surface of the outer panel 13. A latch 21 provided on the rear door 20 is engaged with the door lock striker 18 to fix the rear door 20 in the closed position.

  As shown in FIG. 4, at the upper part of the spot weld W2 (e) at the upper end of the seam weld W1 (b), the joint flange 13a of the outer panel 13 and the joint flange 15a of the second inner panel 15 are overlapped. And continuously welded by seam welding W1 (c). The bottom end of the seam weld W1 (a) is spot-welded W2 (f) with two joining flanges 13a and 15a being stacked, and the top end of the seam weld W1 (c) is two joining flanges 13a and 15a. Four spots are spot-welded W2 (g) in the state of sheet overlap.

  Thus, at the rear side 12d of the door opening 12, the spot weld W2 (b) and the spot welds W2 (a), W2 (c), W2 (d) are arranged at both ends of the seam weld W1 (a). Spot welds W2 (a), W2 (c), W2 (d) and spot welds W2 (e), W2 (f) are arranged at both ends of the weld W1 (b), and both ends of the seam weld W1 (c). Are spot welds W2 (e), W2 (f) and spot welds W2 (g).

  In the present embodiment, the nugget diameter d of each of the spot welds W2 (a) to W2 (g) is the same as the general nugget diameter d of spot welding of the vehicle body, and each of the seam welds W1 (a) to W1. The nugget width w in (c) is set so that the relation of 0.29 ≦ w / d ≦ 0.36 is established with respect to the nugget diameter d.

  Although the welding of the rear side 12d of the door opening 12 of the rear door has been described above, the upper side 11a, the lower side 11b, the front side 11c and the rear side 11d of the door opening 11 of the front door, and the upper side 12a and the lower side of the door opening 12 of the rear door. At least one place is also seam welded to each of 12b and front side 12c (see FIG. 3).

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

  The rear side 12d of the door opening 12 of the rear door of the vehicle body is connected to the outdoor outer panel 13 and the indoor first inner panel 14 and the second inner panel 15 by seam welding W1 (a ), W1 (b), W1 (c), and the relationship between the nugget width w of the seam welds W1 (a) to W1 (c) and the nugget diameter d of normal spot welding of the vehicle body is expressed as 0. .29 ≦ w / d ≦ 0.36, the strength of the joint flanges 13a, 14a, 15a against opening deformation is high, and the width of the joint flanges 13a, 14a, 15a can be reduced to reduce the weight. While using seam welding W1 (a) to W1 (c), a shear strength equivalent to that of normal spot welding can be obtained. In addition, since the seam welds W1 (a) to W1 (c) are welded while pressing the overlapping joining flanges 13a, 14a, and 15a with electrodes, there is no gap between the joining flanges 13a, 14a, and 15a, and the welding strength is stable. In addition, productivity is improved because no special welding jig is required.

  Further, both ends of the seam welded portions W1 (a) to W1 (c) are spot welded W2 (a) to W2 (g), and the relationship between the nugget width w and the nugget diameter d is 0.29 ≦ w / Since d ≦ 0.36, the outer panel 13 and the first inner panel 14 or the second inner panel 15 are connected by seam welding W1 (a) to W1 (c) when a bending load is applied to the door opening 12. Opening deformation can be prevented, and the joint flanges 13a, 14a and 15a are connected to the seam welds W1 (a) to W1 (c) at both ends of the seam welds W1 (a) to W1 (c). Since the spot welds W2 (a) to W2 (g) have higher peel strength than those, both ends of the seam welds W1 (a) to W1 (c) are peeled off by spot welding W2 (a) to W2 (g). Can be prevented by .

Further, a bracket 16 that supports the door lock striker 18 is sandwiched between the outer panel 13 and the second inner panel 15, and the middle portion of the portion where the outer panel 13, the bracket 16, and the second inner panel 15 are stacked is seamed. Since welding W1 (b) and spot welding W2 (d) and W2 (e) were performed at both ends of the seam welded W1 (b) in the three-layered portion (see FIGS. 4 and 7) In addition to improving the rigidity of the door opening 12 around the door lock striker 18, the bracket 16 that supports the door lock striker 18 to which a large load is applied is attached to the seam weld W1 (b) and spot welds W2 (d), W2 ( It can be firmly fixed by the combined use of e).

The inner panel below the bracket 16, a first inner panel 14 of the lower, dividing the bracket 16 and a second inner panel 15 of the upper to be sandwiched between the outer panel 13, the first inner panel 14, together with the second inner panel 15 and outer panel 13 is part of the spot welding W2 (c) became 3 ply, the first inner panel 14 and outer panel 13 adjacent to the lower side of the spot welding W2 (c) Is seam welded W1 (a), and further adjacent to the upper spot weld W2 ( e) in the overlapped portion of the outer panel 13, the bracket 16, and the second inner panel 15 and the second inner panel 15 and outer panel 13 that the portion becomes two heavy roots and seam welding W1 (c) , The peeling of end portion of the seam welding W1 (a) of the first inner panel 14 and outer panel 13, and a separation of the ends of the seam welding W1 (c) of the second inner panel 15 and outer panel 13, three It can be blocked by spot welding W2 (c) , W2 (e) of the overlapped portion. Moreover, since it is not necessary to seam weld the portion where the first inner panel 14, the second inner panel 15 and the outer panel 13 are overlapped, it is not necessary to change the welding conditions for seam welding according to the welding site. The quality of seam welding can be guaranteed.

  Then, the joint flanges of the outer panel and the inner panel that constitute the upper side 11a, 12a, the lower side 11b, 12b, the front side 11c, 12c and the rear side 11d, 12d of the front door and the rear door are respectively overlapped. Since the seam welding is performed (see FIG. 3), the rigidity of the door openings 11 and 12 is improved, so that not only the support rigidity of the door but also the rigidity of the entire vehicle body is improved.

  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, the number of spot welds W2 arranged at both ends of the seam weld W2 is not limited to the embodiment and can be set arbitrarily.

11 door opening 11a upper side 11b lower side 11c front side 11d rear side 12 door opening 12a upper side 12b lower side 12c front side 12d rear side 13 outer panel 13a joint flange 14 first inner panel (inner panel)
14a Joint flange 15 Second inner panel (inner panel)
15a Joint flange 16 Bracket 18 Door lock striker W1 , W1a to W1c seam welding W2 , W2a, W2c to W2f spot welding

Claims (3)

The outer outer panel (13) on the outdoor side and the inner panel (14, 15) on the indoor side are seam welded (W1) and spot welded (W2) at the joint flanges (13a, 14a, 15a) to open the door of the vehicle body ( 11 and 12), the vehicle body structure,
A bracket (16) supporting a door lock striker (18) is sandwiched between the outer panel (13) and the inner panel (15), and the outer panel (13), the bracket (16) and the inner panel (15) are supported. ) Are seam welded (W1b) at the intermediate portion of the overlapped portion of the three sheets, and spot welded (W2d, W2e) at both ends of the seam welded portion (W1b) of the overlapped portion of the three sheets. A vehicle body structure characterized by that. Below the bracket (16), the inner panel (14, 15) is sandwiched between the lower first inner panel (14) and the bracket (16) between the outer panel (13). Dividing into a second inner panel (15) , the portion where the first inner panel (14), the second inner panel (15) and the outer panel (13) are overlapped is spot welded (W2c ). ) as well as, the spot welding (W2 c) to adjacent the first inner panel (14) and said outer panel (13) becomes 2 ply portions and seam welding (W1a), further, the outer panel (13), the bracket (16) upper spot welding in and the second portion inner panel (15) becomes 3 ply (W2 e) Adjacent, characterized in that said second portion inner panel (15) and said outer panel (13) becomes 2 ply and seam welding (W1 c), a vehicle body structure for an automobile according to claim 1 . The spot welding (W2c) of the portion where the first inner panel (14), the second inner panel (15), and the outer panel (13) are stacked, the first inner panel (14), A portion where the first inner panel (14) and the outer panel (13) are overlapped with each other between the portion where the outer panel (13) is overlapped with the seam weld (W1a). Spot welding (W2a), the upper spot welding (W2e) of the portion where the outer panel (13), the bracket (16) and the second inner panel (15) are overlapped, and the first 2 Between the seam weld (W1c) of the portion where the inner panel (15) and the outer panel (13) are overlapped, the second arm Napaneru (15) and said outer panel (13) is characterized in that a portion of a two ply was spot-welded (W2f), body structure of a vehicle according to claim 2.

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