JP5797856B2 - Vehicle door frame - Google Patents

Description

  The present invention relates to a vehicle door frame having a door sash, a bracket and a beltline reinforcement provided below the door sash.

  A vehicle door frame constructed with a beltline reinforcement at the lower part of the door sash that follows the exterior shape of the door glass. It is fixed to the door panel at the frame corner between the end of the beltline reinforcement and the door sash. A type in which a bracket is interposed is known (for example, Patent Document 1).

JP2007-223406A

  In the vehicle door frame of the above type, since the joint portion between the beltline reinforcement and the bracket is located in the middle of one side of the frame, it is particularly required to ensure strength at the joint portion. Specifically, when joining by welding, it is required to have a structure that has high bending rigidity and is hardly affected by thermal strain.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle door frame that has a simple structure and is inexpensive and excellent in the strength of a joint between a beltline reinforcement and a bracket.

  The vehicle door frame of the present invention includes a door sash, a beltline reinforcement, and a bracket that connects the door sash and the beltline reinforcement and is fixed to the door panel. The bracket and the beltline reinforcement are respectively Are joined by a plurality of welds in a relationship in which the lines extending from the weld lines do not coincide with each other. The plurality of welded portions have at least two welded portions in which the respective weld lines are non-parallel when viewed from the side of the door, and these two welded portions are arranged in the longitudinal direction of the belt line reinforcement. As it advances, it has an inclination that gradually changes the distance between the weld lines, and lines extending from the weld lines intersect each other on the belt line reinforcement or the bracket when viewed from the side of the door. In addition, the welding line in this invention means the assumption line when expressing a welding part as one line.

  For example, the weld lines of the two welds are gradually spaced apart from each other as they move away from the longitudinal end of the belt line reinforcement that overlaps the bracket, and the weld lines are extended from each other when viewed from the side of the door. It is good to cross the line on the bracket.

  According to the present invention described above, a simple and inexpensive configuration in which the weld lines of two welds are oriented in non-parallel directions and the lines extending from the weld lines intersect each other on the belt line reinforcement or the bracket. Thus, a vehicle door frame excellent in the strength of the joint between the beltline reinforcement and the bracket can be obtained.

It is a side view which shows the door frame for vehicles which consists of a door sash, a beltline reinforcement, and a bracket to which this invention is applied. It is a side view which shows the junction part vicinity of a beltline reinforcement and a bracket in a 1st reference form. It is a perspective view of the disassembled state of the beltline reinforcement and bracket in a 1st reference form. It is a perspective view of the joined state of the beltline reinforcement and bracket in the first reference form. It is a side view which shows the junction part vicinity of the beltline reinforcement and bracket in a 2nd reference form. It is a perspective view of the disassembled state of the beltline reinforcement and bracket in the 2nd reference form. It is a perspective view of the joined state of the beltline reinforcement and bracket in the 2nd reference form. It is a side view which shows the junction part vicinity of the beltline reinforcement and bracket in embodiment of this invention. It is a perspective view of the disassembled state of the beltline reinforcement and bracket in the same embodiment. It is a perspective view of the joined state of the beltline reinforcement and bracket in the same embodiment. It is sectional drawing of the joining state of the beltline reinforcement and bracket in a 3rd reference form.

  FIG. 1 shows a door frame 10 constituting a door for a rear seat of a vehicle. The front-rear direction and the vertical direction in the following description correspond to the front-rear direction and the vertical direction of the vehicle. The door frame 10 has a frame shape in which four sides are constituted by a door sash 11 having a shape that follows an outer shape of a door glass (not shown) and a beltline reinforcement 17 that is positioned below the door sash 11 and extends in the vehicle front-rear direction. At one corner, a bracket 15 is interposed between the door sash 11 and the beltline reinforcement 17. Specifically, the door sash 11 is located on the front side and extends in the up-down direction, the upright sash 12 extends upward from the upper end of the upright sash 12, and the upper sash 13 extends obliquely downward. The bracket 15 is fixed to the lower part of the rear sash 14, and the vicinity of the rear end portion of the beltline reinforcement 17 is joined to the bracket 15 by welding. The vicinity of the front end portion of the beltline reinforcement 17 is joined to the vicinity of the lower end portion of the upright pillar sash 12. Further, another bracket 16 is fixed near the front end of the beltline reinforcement 17. The front and rear brackets 15 and 16 are fixed to a door panel (inner panel) (not shown) constituting the main body portion of the door. The door sash 11 forms a window opening 18 surrounded by the upright pillar sash 12, the upper sash 13, and the rear sash 14, and the door glass moves up and down in the window opening 18. The belt line reinforcement 17 extends along the upper edge of the door panel. The above components in the door frame 10 are formed as a molded product of a light alloy (for example, aluminum).

  The joint between the bracket 15 and the beltline reinforcement 17 in the door frame 10 is shown enlarged in FIG. 2 to 7 and FIG. 11 show a reference form different from the present invention, and FIGS. 8 to 10 show embodiments to which the present invention is applied.

  2 to 4 show a first reference embodiment. As shown in FIG. 3, the beltline reinforcement 17 includes a hollow box-shaped cross-section portion 20, and plate-like upper edge flange portions 21 and lower edges that extend upward and downward from the box-shaped cross-section portion 20. A flange portion 22 is provided. The bracket 15 can overlap the upper edge flange portion 21 located above the escape recess 23 and the escape recess 23 into which the rear end portion of the box-shaped cross section 20 of the beltline reinforcement 17 can enter. It has the upper superposition part 24 and the lower superposition part 25 which can be located in the lower part of the escape recessed part 23, and can overlap with the lower edge flange part 22. FIG.

  As shown in FIG. 2, in the beltline reinforcement 17, the upper rear end surface 30 of the upper edge flange portion 21 and the lower rear end surface 31 of the lower edge flange portion 22 are different in the front-rear direction position. Specifically, the upper rear end surface 30 and the lower rear end surface 31 are surfaces that are substantially orthogonal to the longitudinal direction of the beltline reinforcement 17 and substantially parallel to each other, but the upper rear end surface 30 is lower than the lower rear end surface 31. The position in the front-rear direction (position in the longitudinal direction of the beltline reinforcement 17) is offset so that is positioned rearward. Therefore, as shown in FIGS. 2 and 4, when the upper edge flange portion 21 and the lower edge flange portion 22 of the beltline reinforcement 17 are overlapped with the upper overlap portion 24 and the lower overlap portion 25 of the bracket 15, respectively (at this time) The end of the box-shaped cross section 20 enters the escape recess 23), the boundary between the upper edge flange 21 (upper rear end face 30) and the upper overlapping part 24, and the lower edge flange 22 (lower rear end face 31). And the boundary part of the lower superposition part 25 becomes the positional relationship which shifted | deviated to the front-back direction. The bracket 15 and the beltline reinforcement 17 are joined by welding. As described above, the assumed line when representing the welded portion as one line is a welded line, and the bracket 15 and the beltline reinforcement 17 are welded portions A of the welded line along the upper rear end surface 30 and the lower rear. Welding is performed at the weld B of the weld line along the end surface 31.

  In this way, the two welded portions A and B that join the bracket 15 and the beltline reinforcement 17 are in a relationship where the positions are different in the longitudinal direction of the vehicle, that is, the longitudinal direction of the beltline reinforcement 17. The line obtained by extending the weld line in the part A and the line obtained by extending the weld line in the weld part B do not coincide with each other (do not line up on a straight line). This joint structure has the following advantages.

  First, the effect of improving the bending rigidity at the joint portion can be obtained. As described above, the door frame 10 has a quadrangular frame shape with the upright pillar sash 12, the upper sash 13, the rear sash 14, and the belt line reinforcement 17 as four sides. Of these four sides, the rear sash 14 and the belt line are formed. The reinforcements 17 are connected via a separate member called a bracket 15. In other words, only one side on the belt line reinforcement 17 side of the four sides constituting the door frame 10 has a structure having a joint portion (welded portion A, B) with the bracket 15 in the middle thereof. Here, unlike the first reference embodiment, the two welded portions of the bracket 15 and the beltline reinforcement 17 are not shifted in the vehicle front-rear direction, and the respective weld lines are aligned in a straight line. Assuming that a force that distorts the door frame 10 is applied, this straight line welded portion (weld line) is likely to act as an axis for bending the door frame 10. On the other hand, in the joining structure of the first reference form, the positions of the welding lines are shifted by offsetting the two welds A and B between the bracket 15 and the beltline reinforcement 17 back and forth. Further, resistance to a force that bends the bracket 15 and the beltline reinforcement 17 is increased, and the strength of the joint structure between the bracket 15 and the beltline reinforcement 17 can be increased. In addition, for the same reason as described above, an effect that it is difficult to be affected by thermal strain due to welding at the welded portions A and B can be obtained.

  5 to 7 show a second reference form. In the second reference embodiment, the bracket 15 has the same structure as the first reference embodiment, and the cross-sectional shape of the beltline reinforcement 17 is also common to the first reference embodiment. The difference from the first reference form is the shape of the rear end of the belt line reinforcement 17, and the upper rear end face 32 of the upper edge flange portion 21 is the same as the upper rear end face 30 of the first reference form. While it is composed of one linear surface that is substantially orthogonal to the longitudinal direction of the line reinforcement 17, the lower rear end surface 33 of the lower edge flange portion 22 is formed in a stepped shape that combines a plurality of surfaces. . More specifically, the lower rear end surface 33 is connected to two vertical surfaces 33a and 33b, which are substantially parallel to the upper rear end surface 32 and offset in the vehicle front-rear direction, and the vertical line 33a and 33b. It has a longitudinal surface 33 c that faces the longitudinal direction of the force 17. When the bracket 15 and the beltline reinforcement 17 are joined, a welded portion between the upper edge flange portion 21 and the upper overlapping portion 24 becomes a welded portion C similar to the welded portion A of the first reference embodiment. That is, the weld line of the welded portion C is formed along the upper rear end surface 32. On the other hand, a welded portion (weld line) between the lower edge flange portion 22 and the lower overlapping portion 25 is a welded portion D along the longitudinal surface 33c. The weld lines of these two welded portions C and D are in a relationship in which the extended lines do not coincide with each other (do not line up in a straight line), like the weld lines of the welded portions A and B of the first reference embodiment. Therefore, the joint structure has excellent rigidity against bending and resistance to thermal strain during welding.

  In the embodiment of the present invention shown in FIGS. 8 to 10, the bracket 15 is set to have a large amount of forward protrusion of the upper overlapping portion 24 in order to ensure the amount of overlapping with the beltline reinforcement 17. And different from the first and second reference embodiments. Regarding the beltline reinforcement 17, the cross-sectional shape is common to the first and second reference embodiments, but the shape of the rear end portion is different. In other words, the upper rear end surface 34 of the upper edge flange portion 21 and the lower rear end surface 35 of the lower edge flange portion 22 gradually increase in mutual width (interval in the vertical direction) from the rear to the front of the vehicle. It is formed as an inclined surface. When the bracket 15 and the beltline reinforcement 17 are joined, the welded portions E and F along the upper rear end surface 34 and the lower rear end surface 35 are welded. In a state where the door frame 10 is viewed from the side as shown in FIG. 8, the lines obtained by extending the weld lines of the welded part E and the welded part F intersect at a position where the bracket 15 overlaps. The weld lines of these two welded portions E and F do not coincide with each other in the same manner as the welded portions A and B of the first reference form and the welded parts C and D of the second reference form. Since it is a relationship (not lined up in a straight line), it has excellent rigidity against bending and resistance to thermal strain during welding. Contrary to this embodiment, the inclination direction (the direction of the weld line) of the upper rear end surface 34 of the upper edge flange portion 21 and the lower rear end surface 35 of the lower edge flange portion 22 proceeds from the front of the vehicle to the rear. It is also possible to set so that the width of each other increases. In this case, when the door frame 10 is viewed from the side as shown in FIG. 8, the lines obtained by extending the weld lines of the two welds intersect with each other at positions overlapping the belt line reinforcement 17.

  FIG. 11 shows a third reference form. In both the first and second reference embodiments and the embodiment of the present invention, the two welded portions that join the bracket 15 and the beltline reinforcement 17 shift the relative positional relationship when the door is viewed from the side. On the other hand, in the third reference embodiment, the two welded portions G and H that join the bracket 15 and the beltline reinforcement 17 are different in the relative position in the vehicle inside / outside direction (door thickness direction). It is Specifically, the beltline reinforcement 17 has an upper edge flange portion 121 extending upward from the box-shaped cross-section portion 120 located on the vehicle inner side, and a lower edge flange portion 122 extending downward from the box-shaped cross-section portion 120 on the vehicle outer side. The relative positions of the upper edge flange portion 121 and the lower edge flange portion 122 are offset so as to be positioned. Accordingly, the upper overlapping portion 124 and the lower overlapping portion 125 on the bracket 15 side are also in a relationship of being displaced in the vehicle inside / outside direction. And the welding part G between the upper edge flange part 121 and the upper side superimposition part 124, and the welding part H between the lower edge flange part 122 and the lower side superposition part 125 have shifted the position mutually in the vehicle inside and outside, Since the lines obtained by extending the weld lines of these welds G and H do not coincide with each other (do not line up in a straight line), the rigidity against bending and the heat during welding are the same as in each reference embodiment and the embodiment of the present invention. The joint structure has excellent resistance to strain.

  Although the present invention has been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. For example, in the illustrated embodiment, by changing the direction of the rear end portions (rear end surfaces 34 and 35) of the upper edge flange portion 21 and the lower edge flange portion 22 in the beltline reinforcement 17, welding is performed at two locations, upper and lower. Although the weld lines of the parts (E and F) are not arranged in a straight line, the direction of the front end (front edge) part of the upper overlapping part 24 and the lower overlapping part 25 in the bracket 15 is changed. A similar effect can be obtained.

  Further, the illustrated embodiment is applied to the joining structure of the bracket and the beltline reinforcement at the rear corner portion of the door frame constituting the door for the rear seat, and the bracket at the front corner portion of the door frame. In the type in which the beltline reinforcement is joined, the present invention can also be applied to the joined portion. Moreover, if it is a type which has the junction part by welding between a bracket and a beltline reinforcement, it is applicable not only to the door frame of the door for rear seats but to the door frame of the door for front seats.

  In the illustrated embodiment, two welds are provided between the bracket and the beltline reinforcement, but the bracket and the beltline reinforcement may be joined at three or more welds. In that case, while satisfying the characteristics of the present invention with at least two welds, the lines extending the respective weld lines do not coincide with each other (do not line up in a straight line) with respect to all three or more welds. Good.

  Further, the present invention is suitable when the material of the door frame including the beltline reinforcement and the bracket is a light metal (light alloy) such as aluminum. However, the present invention is applied to a door frame made of a material other than light metal such as iron. Is also possible.

DESCRIPTION OF SYMBOLS 10 Door frame 11 Door sash 12 Standing column sash 13 Upper sash 14 Rear sash 15 16 Bracket 17 Beltline reinforcement 20 120 Box-shaped cross-section 21 121 Upper edge flange part 22 122 Lower edge flange part 23 Relief recessed part 24 124 Upper overlapping part 25 125 Lower overlapping portion 30 32 34 Upper rear end surface 31 33 35 Lower rear end surface 33a 33b Vertical surface 33c Longitudinal surfaces A to H Welded portion

Claims (2)

Door sash;
Beltline reinforcement; and a beltline reinforcement formed by a plurality of welds connecting the door sash and the beltline reinforcement and fixed to the door panel, and extending the weld lines so that they do not coincide with each other. Brackets to be joined;
With
The plurality of welds have at least two welds in which the respective weld lines are oriented in a non-parallel direction when viewed from the side of the door,
The two welds have slopes that gradually change the distance between the weld lines as they proceed in the longitudinal direction of the beltline reinforcement, and extend the weld lines as viewed from the side of the door. A vehicular door frame characterized by intersecting lines on the beltline reinforcement or on the bracket. The bracket is joined to a position overlapping the longitudinal end of the beltline reinforcement,
The welding lines of the two welds gradually increase the distance from each other as they move away from the longitudinal ends of the beltline reinforcement that overlaps with the bracket, and when viewed from the side of the door, The vehicle door frame according to claim 1, wherein lines extending from each other intersect on the bracket.

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