JP2013018330A - Bracket structure for vehicle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bracket structure for vehicle capable of preventing generation of poor painting with a simple configuration without causing cost increases.SOLUTION: The bracket structure 4 for vehicle includes: a convex-shaped mounting surface 4A formed on the top to tighten other components; a through-hole 9 for tightening formed in the mounting surface 4A; and a welding nut 7 provided on the rear side of the mounting surface 4A. The through-hole 9 is made into an elongated hole extending to the side of the welding nut 7. Portions of both sides in the shorter direction of the through-hole 9 of the bracket 4 are joined through the welding nut 7. Additionally, the longitudinal direction of the through-hole 9 is aligned with that of the bracket 4, and both ends of the through-hole 9 in the longitudinal direction are made to be exposed on both sides of the welding nut 7 to be opened as an air vent hole 10.

Description

  The present invention relates to a structure of a vehicle body bracket in which a welding nut is fixed to the back side of a mounting surface for fastening and fixing other components.

  FIG. 6 is a partial perspective view of a vehicle body floor portion of a four-wheel vehicle. In FIG. 6, reference numeral 1 denotes a floor panel arranged substantially horizontally to form the floor surface of the vehicle body. The side sill 2 (only one is shown in FIG. 6) arranged in the longitudinal direction of the vehicle is attached to the part. Between the left and right side sills 2 on the floor panel 1, a cross member 3 having a cross-sectional gate shape (reverse channel shape, hat cross section) opened downward is arranged in the vehicle width direction to bulge the floor surface upward. Both ends of the floor tunnel and the side sill 2 formed along the longitudinal direction of the vehicle are connected.

  Seat mounting brackets 4 (only one of which is shown in FIG. 6) are attached to the upper portions of the left and right end portions of the cross member 3 so as to be mounted from above. A seat mounting bracket 5 is welded to the side sill 2 and the floor panel 1 and fixedly arranged behind the seat mounting bracket 4. The seat mounting bracket 4 and the seat mounting bracket 5 constitute a front mounting portion and a rear mounting portion of the front seat of the vehicle, respectively. The seat mounting bracket 4 and the seat mounting bracket 5 provided behind the seat mounting bracket 4 are provided. Between them, seat rails (not shown) arranged in the vehicle front-rear direction are installed. Note that the seat rail allows the front and rear positions of the front seat to be adjusted, and although not shown, the seat is attached to the left and right seat rails so that the seat can slide back and forth.

  By the way, since the position and height of the seat differ depending on the vehicle type, the structure in which the seat rail is directly attached to the cross member 3 cannot use the cross member 3 and the seat in common in different vehicle types. Therefore, apart from the cross member 3, a relatively small dedicated seat mounting bracket 4 is prepared for each model, and this is welded to the cross member 3, which is a relatively large part. Common use is possible.

  Here, details of the seat mounting bracket (hereinafter simply referred to as “bracket”) 4 will be described with reference to FIGS. 7 and 8.

  7 is a perspective view of the bracket, and FIG. 8 is a cross-sectional view taken along the line CC of FIG. 7. As shown, the bracket 4 is press-formed into a reverse channel shape in accordance with the outer shape of the cross member 3 (see FIG. 6). A flat mounting surface 4A having a convex shape upward is formed at the center in the longitudinal direction (left-right direction). A circular through hole 6 is formed on the mounting surface 4A, and a welding nut 7 is welded around the through hole 6 on the back side of the mounting surface 4A as shown in FIG.

  Thus, the seat rail (not shown) is placed on the mounting surface 4A of the bracket 4, and the through hole 6 (not shown) formed in the bracket and the through hole 6 formed in the mounting surface 4A of the bracket 4 are viewed from above. By screwing a bolt (not shown) to be inserted into the welding nut 7, the front end portion of the seat rail is fastened and fixed to the bracket 4. The reason why the mounting surface 4A of the bracket 4 protrudes upward is to avoid interference with the other part of the bracket 4 of the seat rail attached thereto.

  By the way, the whole body is electrodeposited by being immersed in the coating liquid of the coating immersion tank in the manufacturing process, but the upper surface of the bracket 4 is closed as shown in FIG. In the bracket, an air pocket (air pocket) is formed. Due to this air pool, a portion that does not come into contact with the coating liquid is generated in the bracket 4 and the portion is not painted, which causes problems such as rust. there's a possibility that.

  In order to solve the above problem, the air vent hole 8 may be formed on the upper surface of the bracket 4 as shown in FIG. 9B, but actually the air vent hole 8 as shown in FIG. 7 and FIG. Is formed in a step portion that is lower than Δh (see FIG. 8) with respect to the mounting surface 4A of the bracket 4, air cannot be completely removed from the air vent hole 8, and an air pool is formed in the bracket 4. Will occur.

  Further, as shown in FIG. 9C, air is released from the screw hole 7a of the welding nut 7 welded to the bracket 4, but the air is completely removed for the welding nut 7 having a certain height. As shown in the drawing, an air stagnation inevitably occurs in the bracket 4 as shown in the figure, which causes poor painting.

  In order to solve the above problem, in Patent Document 1, as shown in FIG. 10, the bead 110 is formed in the recess 104 a of the vehicle body constituting sheet metal member 104 so that the amount of bulging gradually changes in the extending direction. In addition, a configuration has been proposed in which the air vent hole 108 is formed in a portion of the bead 110 having the highest vertical height.

Japanese Utility Model Publication No. 4-071381

  However, in the configuration proposed in Patent Document 1, additional processing for forming the beads 110 and the air vent holes 108 is necessary, and thus there is a problem in that the number of processing steps increases and cost increases cannot be avoided.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicle bracket structure capable of preventing the occurrence of coating failure with a simple configuration without causing an increase in cost.

  In order to achieve the above object, the invention described in claim 1 has a convex mounting surface for fastening and fixing other parts, and has a through-hole for fastening and fixing on the mounting surface. A bracket structure of a vehicle body, wherein a welding nut is attached to the back side of the surface, wherein the through hole is a long hole extending to the side of the welding nut.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, both lateral portions of the through hole of the bracket are connected via the welding nut.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the longitudinal direction of the through hole is aligned with the longitudinal direction of the bracket, and both longitudinal end portions of the through hole appear on both sides of the welding nut. It was made to open as an air vent hole.

  According to the first aspect of the present invention, since the through hole formed in the mounting surface which is a relatively high place of the bracket is a long hole extending to the side of the welding nut, the mounting surface of the bracket is lateral to the welding nut. When the air vent hole is opened and the entire vehicle body is immersed in the coating solution during electrodeposition coating of the vehicle body, the air remaining inside the bracket is completely discharged from the air vent hole, and the air is trapped inside the bracket. Will not occur. For this reason, the occurrence of poor coating due to air accumulation in the bracket is prevented, and problems such as rust do not occur.

  Further, since a part of the through hole is exposed to the side of the welding nut to form the air vent hole, the opening area of the air vent hole is made larger than the opening area of the independently formed air vent hole. Therefore, the air can be removed efficiently to prevent the occurrence of air accumulation.

  Furthermore, since the through-hole is formed continuously with the conventional circular through-hole, the through-hole can be made relatively large, and the punching die for forming the through-hole is also increased and its durability is increased. Is increased.

  And the above effect is acquired by the simple structure which makes a through-hole only a long hole, and since a new additional process is not required, the cost increase by the increase in a process man-hour can be suppressed.

  According to the second aspect of the present invention, since both sides in the short direction of the through hole formed in the bracket are connected to each other via the welding nut, the strength of the through hole portion of the bracket due to the long through hole. The decrease in rigidity is minimized.

  According to the third aspect of the present invention, the longitudinal direction of the through hole is aligned with the longitudinal direction of the bracket, and both end portions in the longitudinal direction of the through hole are exposed on both sides of the welding nut and opened as air vent holes. A plurality of air vent holes can be easily formed in accordance with the longitudinal direction of the bracket through which the air flows, and air can be efficiently extracted from the air vent holes to prevent air trapping in the bracket more reliably. be able to.

It is a fragmentary perspective view of a vehicle body provided with the bracket structure which concerns on this invention. It is a perspective view of the bracket of the vehicle body shown in FIG. FIG. 3 is an enlarged detail view of a main part of FIG. 2. FIG. 4 is a sectional view taken along line AA in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is a fragmentary perspective view of a vehicle body provided with the conventional bracket structure. It is a perspective view of the bracket of the vehicle body shown in FIG. It is CC sectional view taken on the line of FIG. (A)-(c) is sectional drawing which shows the contact state (air accumulation state) with the coating liquid of the bracket immersed in the coating liquid. It is a fragmentary perspective view of the sheet metal member for body composition proposed in patent documents 1.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a partial perspective view of a vehicle body provided with a bracket structure according to the present invention, FIG. 2 is a perspective view of the bracket of the vehicle body shown in FIG. 1, FIG. 3 is an enlarged detail view of the main part of FIG. 2, and FIG. -A cross-sectional view, FIG. 5 is a cross-sectional view taken along the line BB of FIG. 3, in which the same elements as those shown in FIGS. A repetitive description thereof will be omitted, and only the characteristic part of the present invention will be described.

  FIG. 1 is a partial perspective view of a vehicle body floor of a four-wheel vehicle. In FIG. 1, reference numeral 1 denotes a floor panel arranged substantially horizontally to constitute the floor of the vehicle body. A side sill 2 (only one is shown in FIG. 1) arranged in the vehicle front-rear direction is attached to the portion. Between the left and right side sills 2 on the floor panel 1, a cross member 3 having a cross-sectional gate shape (reverse channel shape, hat cross section) opened downward is arranged in the vehicle width direction to bulge the floor surface upward. Both ends of the floor tunnel and the side sill 2 formed along the longitudinal direction of the vehicle are connected.

  Brackets 4 (seat mounting brackets 4, only one of which is shown in FIG. 1) for mounting a front mounting part (front mounting part of the seat rail) of the front seat of the vehicle are provided above the left and right ends of the cross member 3. It is covered from above and welded. As shown in the drawing, the bracket 4 is press-formed in a reverse channel shape in accordance with the outer shape of the cross member 3, and a flat mounting surface having a convex shape upward is formed in the center portion in the longitudinal direction (left-right direction). 4A is formed. That is, the vehicle front end side surface extending downward from the front end edge of the bracket 4 and the vehicle rear end side surface extending downward from the rear end edge of the bracket 4 are respectively extended downward, and the vehicle front side wall of the cross member 3 is The bracket 4 is overlapped on the rear wall of the vehicle and fixed by welding, and both ends of the bracket 4 in the left-right direction of the vehicle are overlapped on the upper surface of the cross member 3 and fixed by welding. The bracket 4 is fixed to the upper surface of the cross member 3 by welding. A mounting surface 4A that forms a front mounting portion of the front seat (specifically, a front mounting portion of the seat rail) at the uppermost portion of the bracket 4 is formed by bulging upward (intermediate portion) between both ends of the bracket 4 Yes. A circular through hole 6 is formed in the mounting surface 4A, and a space is formed between the upper surface of the cross member 3 on the back side of the mounting surface 4A and around the through hole 6. As shown in FIG. 4, a welding nut 7 is welded.

  As shown in FIGS. 2 and 3, the present invention is characterized in that the fastening and fixing through hole 9 formed in the mounting surface 4 </ b> A of the bracket 4 is a long hole extending to the side of the welding nut 7. Here, the through-hole 9 is formed so that its longitudinal direction matches the longitudinal direction of the bracket 4 (the left-right direction of the vehicle and the longitudinal direction of the cross member 3), and its width b is as shown in FIG. The outer diameter D is set smaller than the outer diameter D of the flange 7b of the welding nut 7 (b <D), and the length L is set larger than the outer diameter D of the flange 7b of the welding nut 7 as shown in FIG. > D). Therefore, both end portions in the longitudinal direction of the through-hole 9 appear on both sides of the welding nut 7 on the mounting surface 4A of the bracket 4, and this portion opens as a crescent-shaped air vent hole 10 as shown in FIG.

  The welding nut 7 is joined to both lateral portions of the through hole 9 of the bracket 4, and both lateral portions of the through hole 9 of the bracket 4 are connected to each other via the welding nut 7. .

  As described above, in the present embodiment, since the through hole 9 formed in the mounting surface 4A which is a relatively high place of the bracket 4 is a long hole extending to the side of the welding nut 7, the mounting surface 4A of the bracket 4 is used. When a crescent-shaped air vent hole 10 is opened to the side of the welding nut 7 and the entire vehicle body is immersed in the coating solution during electrodeposition coating of the vehicle body, the air remaining in the bracket 4 is vented. It is completely discharged from the hole 10, and no air pool is generated inside the bracket 4. For this reason, generation | occurrence | production of the coating defect by the air pool of the bracket 4 is prevented, and problems, such as rust, do not generate | occur | produce.

  Further, since a part of the long through hole 9 is exposed to the side of the welding nut 7 to form the air vent hole 10, the air vent hole is formed independently of the opening area of the air vent hole 10. As a result, it is possible to perform air venting efficiently and to prevent the occurrence of air accumulation in the bracket 4 with certainty.

  Furthermore, since the long through hole 9 is formed continuously with the conventional circular through hole 6 (see FIG. 7), the through hole 9 can be made relatively large. The punching die (not shown) for forming the substrate is also increased and its durability is improved.

  And the above effect is acquired by the simple structure which makes the through-hole 9 only a long hole, and since a new additional process is not required, the cost increase by the increase in a process man-hour is suppressed.

  Further, in the present embodiment, since both sides in the short direction of the through hole 9 formed in the bracket 4 are connected to each other via the welding nut 7, the through hole 9 of the bracket 4 due to the through hole 9 being a long hole. The decrease in strength and rigidity of the part is minimized.

  Further, in the present embodiment, the longitudinal direction of the through hole 9 is aligned with the longitudinal direction of the bracket 4, and both end portions in the longitudinal direction of the through hole 9 are exposed on both sides of the welding nut 7 to be opened as air vent holes 10. Therefore, the two air vent holes 10 can be easily formed in accordance with the longitudinal direction of the bracket 4 through which air flows, and the air can be efficiently removed from the air vent holes 10 to collect air in the bracket 4. Can be prevented more reliably.

  Although the present invention has been described with respect to the embodiment in which the present invention is applied to a bracket for mounting a seat, the present invention is of course applicable to other arbitrary brackets having the same shape. is there.

DESCRIPTION OF SYMBOLS 1 Floor panel 2 Side sill 3 Cross member 4,5 Bracket 4A Bracket mounting surface 7 Weld nut 8 Air vent hole 9 Through hole 10 Air vent hole

Claims (3)

A structure of a vehicle body bracket having a convex mounting surface for fastening and fixing other parts, a through hole for fastening and fixing being formed on the mounting surface, and a welding nut attached to the back side of the mounting surface Because
A bracket structure for a vehicle body, wherein the through hole is a long hole extending to a side of the welding nut.   The bracket structure for a vehicle body according to claim 1, wherein both side portions in the short direction of the through hole of the bracket are connected via the welding nut. The longitudinal direction of the through hole is aligned with the longitudinal direction of the bracket, and both end portions in the longitudinal direction of the through hole are exposed on both sides of the welding nut to be opened as air vent holes. The vehicle body bracket structure according to 2.

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