Fastening structure of belt anchor

Abstract

To provide a fastening structure of a belt anchor that can suppress displacement of the belt anchor more effectively.SOLUTION: A fastening structure of a belt anchor 22 comprises: the belt anchor 22 which is provided at one end of a buckle 16 of a seat belt; a floor panel 24; an anchor bracket 44 which is joined to the floor panel 24; and a tank bracket 50 to which a fuel tank 70 is fastened and which is joined to the floor panel 24, wherein the belt anchor 22 is fastened together with the floor panel 24, the anchor bracket 44, and the tank bracket 50.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] This specification discloses a fastening structure for a belt anchor provided in a seat belt buckle. [Background technology]

[0002] A seat belt device for a vehicle has a belt-shaped belt body and a buckle fixed to a floor panel. A tongue plate connectable to the buckle is attached to the belt body. By connecting the tongue plate to the buckle, the upper body of an occupant is restrained by the belt body. A belt anchor is fixed to the buckle. The belt anchor is screwed and fastened to the floor panel. Patent Document 1 discloses such a seat belt device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-030462 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of conventional seat belt devices, the strength of the panel material around the fastening part of the belt anchor is insufficient, so when a strong pulling force is applied to the seat belt, the panel material around the fastening part of the belt anchor is deformed, and the belt anchor is displaced.

[0005] Therefore, this specification discloses a belt anchor fastening structure that can more effectively suppress the displacement of the belt anchor. [Means for solving the problem]

[0006] The belt anchor fastening structure disclosed in this specification comprises a belt anchor provided at one end of a seat belt buckle, a floor panel, an anchor bracket joined to the floor panel, and a tank bracket to which a fuel tank is fastened and joined to the floor panel, and is characterized in that the belt anchor is fastened together with the floor panel, the anchor bracket, and the tank bracket.

[0007] In this case, the floor panel, the anchor bracket, and the tank bracket are stacked from above in this order, and the tank bracket may have a bead adjacent to the fastening portion with the belt anchor and extending in the front-rear direction.

[0008] The tank bracket may also include a generally box-shaped main bracket protruding downward from the floor panel, and a support bracket, wherein the support bracket has a skirt portion that is overlapped on the periphery of the main bracket and joined to the main bracket, and a flange portion that extends in a direction parallel to the floor panel and is overlapped on the anchor bracket and the floor panel, and a portion of the flange portion is separated from the floor panel, forming a space between the support bracket and the floor panel.

[0009] The tank may further include a cross member extending in the vehicle width direction and forming a cross space which is a closed space between the floor panel and the cross member, and a bulk arranged within the cross space and spanning the front wall of the cross member and the rear wall of the cross member, wherein the tank bracket is joined to the cross member, and the bulk is adjacent to the tank bracket in the fore-and-aft direction.

[0010] In addition, the tank bracket is located on the front side of the cross member, the front end position of the anchor bracket is approximately the same as the front end position of the tank bracket, and the distance from the fastening portion with the belt anchor to the rear end of the main bracket may be approximately the same as the distance from the fastening portion to the front end of the tank bracket. Effect of the Invention

[0011] According to the belt anchor fastening structure disclosed in this specification, the rigidity around the fastening portion is improved, so that displacement of the belt anchor is effectively suppressed. [Brief description of the drawings]

[0012] [Figure 1] 2 is a schematic diagram of the periphery of a belt anchor of the seat belt device. FIG. [Diagram 2] FIG. [Diagram 3] FIG. 4 is a perspective view of the fastening portion and its periphery as viewed from below the vehicle. [Figure 4] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Diagram 5] FIG. 4 is a cross-sectional view of a fastening structure of a comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, the fastening structure of the belt anchor 22 will be described with reference to the drawings. Fig. 1 is a schematic diagram of the periphery of the belt anchor 22 of the seat belt device 10. In addition, in each drawing, Fr, Up, and Rh respectively indicate the front, upper, and right side of the vehicle.

[0014] The seat belt device 10 shown in Fig. 1 is a three-point seat belt device attached to a rear seat 84 of a vehicle. The seat belt device 10 is broadly divided into a belt body 12 and a buckle 16. The belt body 12 is a belt-shaped member that restrains the upper body of an occupant. One end of the belt body 12 is set in a winder (not shown). The belt body 12 is connected to the buckle 16 via a tongue plate 14.

[0015] The buckle 16 is a member fixed to the vehicle body and to which the tongue plate 14 is connected. The buckle 16 has a buckle body 18, a connecting strap 20, and a belt anchor 22. The buckle body 18 is a portion connected to the tongue plate 14. An insertion opening into which the tongue plate 14 is inserted is formed on the upper end surface of the buckle body 18. A connecting strap 20 extends from the lower end of the buckle body 18, and a belt anchor 22 is fixed to the end of the connecting strap 20. The belt anchor 22 is a metal plate for fixing the buckle 16 to the vehicle body. The belt anchor 22 is placed on a floor panel 24 and fastened to the floor panel 24 by a fastening bolt 80. Hereinafter, the portion to which the belt anchor 22 is fastened is referred to as a "fastening portion 23."

[0016] Here, when the vehicle suddenly stops or suddenly decelerates while the occupant is wearing the seat belt, the occupant tries to move forward relative to the vehicle. This causes the belt body 12 to be pulled strongly toward the front of the vehicle. As the belt body 12 is pulled, a large upward force is applied to the fastening portion 23 of the belt anchor 22. This force causes deformation around the fastening portion 23, displacing the belt anchor 22. If the displacement of the belt anchor 22 changes the restraining position of the occupant by the belt body 12, there is a risk that the occupant will not be restrained appropriately. Therefore, in this example, the belt anchor 22 is fastened together with the floor panel 24, the anchor bracket 44, and the tank bracket 50. This will be described in detail below.

[0017] Fig. 2 is a bottom view of the fastening portion 23 and its periphery, and Fig. 3 is a perspective view of the fastening portion 23 and its periphery viewed from the underside of the vehicle. Furthermore, Fig. 4 is a cross-sectional view taken along line AA in Fig. 2. As shown in Fig. 1, a fuel tank 70 is disposed below the fastening portion 23, but this fuel tank 70 is not shown in Figs. 2 to 4.

[0018] As shown in Figs. 2 to 4, a cross member 30 is fixed to the underside of the floor panel 24. The cross member 30 is a skeletal member extending in the vehicle width direction. In this example, the cross member 30 has a generally hat-shaped cross section that opens upward. That is, the cross member 30 has front and rear walls 32, 34, a bottom wall 36, and front and rear flanges 38, 40. The front and rear flanges 38, 40 are joined to the floor panel 24. As a result, a closed space 42 (see Fig. 4) extending in the vehicle width direction is formed between the cross member 30 and the floor panel 24. Hereinafter, this closed space will be referred to as a "cross space 42."

[0019] As shown in FIG. 4 , a bulk 43 is disposed in the cross space 42, spanning the front wall 32 and the rear wall 34. The bulk 43 is a metal sheet metal part. The position of the bulk 43 in the vehicle width direction is substantially the same as the position of a tank bracket 50 (described later) in the vehicle width direction. The front end of the bulk 43 is joined to the front wall 32 of the cross member 30, and the rear end of the bulk 43 is joined to the rear wall 34 of the cross member 30. By providing such a bulk 43, deformation of the cross member 30 is effectively suppressed.

[0020] A tank bracket 50 is disposed in front of the cross member 30. The tank bracket 50 is a bracket to which a fuel tank 70 is fastened. The tank bracket 50 is broadly divided into a main bracket 51 and a support bracket 60.

[0021] 3 and 4, the main bracket 51 is a generally box-shaped member that protrudes downward from the floor panel 24. The main bracket 51 has a bottom wall 52 and a peripheral wall 54. A portion of the bottom wall 52 is joined to the bottom wall 36 of the cross member 30. In addition, a portion of the peripheral wall 54 is bent to fit along the front wall 32 of the cross member 30 and joined to the front wall 32.

[0022] The support bracket 60 is a bracket that connects the main bracket 51 and the floor panel 24. The support bracket 60 is roughly divided into a skirt portion 62 and a flange portion 64. The skirt portion 62 is overlapped on the peripheral wall 54 of the main bracket 51 and joined to the peripheral wall 54. The flange portion 64 extends in a direction substantially parallel to the floor panel 24 and is joined to the floor panel 24. As is clear from FIG. 3 and FIG. 4, the flange portion 64 is separated from the floor panel 24 from the front end of the main bracket 51 to the periphery of the fastening portion 23, and a space 67 is formed between the flange portion 64 and the floor panel 24. By forming such a space 67, stress concentration at a connecting portion 66 (see FIG. 3 and FIG. 4) from the skirt portion 62 to the flange portion 64 is alleviated, and deformation of the support bracket 60 is effectively suppressed.

[0023] 2 to 4, the flange portion 64 expands to a position where it sufficiently overlaps the fastening portion 23. More precisely, as shown in FIG. 4, the distance L1 from the fastening portion 23 to the front end of the flange portion 64 is approximately the same as the distance L2 from the fastening portion 23 to the rear end of the main bracket 51. Also, as shown in FIG. 3, a plurality of beads 68 are formed in the flange portion 64 near the fastening portion 23. With this configuration, deformation of the panel material around the fastening portion 23 can be suppressed.

[0024] An anchor bracket 44 is further provided around the fastening portion 23. The anchor bracket 44 is a reinforcing panel material for reinforcing the periphery of the fastening portion 23. As shown in Figs. 3 and 4, the anchor bracket 44 is a panel material that is disposed between the floor panel 24 and the support bracket 60 and joined to the floor panel 24. The front end position of the anchor bracket 44 is approximately the same as the front end position of the support bracket 60.

[0025] Here, as is clear from FIG. 2 to FIG. 4 and as described above, the flange portion 64 of the support bracket 60 extends to a position where it completely overlaps the fastening portion 23. As a result, in the fastening portion 23, the belt anchor 22, the floor panel 24, the anchor bracket 44, and the support bracket 60 overlap in this order. In this example, fastening holes are formed in the four metal plates 22, 24, 44, and 60, and the four metal plates 22, 24, 44, and 60 are fastened together with the fastening bolt 80. In addition, in order to facilitate this fastening, a weld nut 82 (see FIG. 4) that screws into the fastening bolt 80 is welded around the fastening hole of the flange portion 64. That is, according to this example, the four metal plates 22, 24, 44, and 60 are stacked around the fastening portion 23 of the belt anchor 22 and fastened to each other. As a result, the strength around the fastening portion 23 can be improved, and deformation around the fastening portion 23 can be effectively suppressed.

[0026] Next, the effect of such a fastening structure will be described in comparison with a comparative example. Fig. 5 is a cross-sectional view of the fastening structure of the comparative example. In the comparative example, the support bracket 60* is small and does not reach the fastening portion 23. Therefore, in the comparative example, the metal plates stacked in the fastening portion 23 are only three sheets, the belt anchor 22, the floor panel 24, and the anchor bracket 44*. In this case, the rigidity around the fastening portion 23 is poor, and deformation around the fastening portion 23, and thus displacement of the belt anchor 22, are likely to occur.

[0027] In the comparative example, the front end of the anchor bracket 44* is located near the fastening portion 23, and therefore near the front end of the belt anchor 22. In this case, stress is concentrated at point P of the floor panel 24 near the front end of the anchor bracket 44*, making the floor panel 24 prone to deformation.

[0028] Furthermore, in the case of the support bracket 60* of the comparative example, most of the flange portion 64* is close to the floor panel 24. In other words, in the case of the support bracket 60* of the comparative example, no space 67 is formed between the flange portion 64* and the floor panel 24. As a result, the rigidity of the support bracket 60* itself is poor, and the support bracket 60* and the floor panel 24 to which the support bracket 60* is joined are easily deformed. And, as the floor panel 24 deforms, the belt anchor 22 is easily displaced.

[0029] On the other hand, the support bracket 60 disclosed in this specification completely wraps the fastening portion 23 as described above. As a result, the four metal plates 22, 24, 44, and 60 are stacked in the fastening portion 23. This effectively suppresses deformation around the fastening portion 23. In this example, the support bracket 60 and the anchor bracket 44 both extend to positions sufficiently away from the fastening portion 23. This configuration makes it difficult for stress to concentrate around the fastening portion 23, effectively suppressing deformation of the floor panel 24 and, ultimately, displacement of the belt anchor 22.

[0030] As described above, a bead 68 is formed on the flange portion 64 around the fastening portion 23. A portion of the flange portion 64 is separated from the floor panel 24, and a space 67 is formed between the flange portion 64 and the floor panel 24. This configuration increases the rigidity of the flange portion 64, and deformation of the flange portion 64, and therefore displacement of the belt anchor 22, can be effectively suppressed.

[0031] Furthermore, in this example, a bulk 43 that reinforces the cross member 30 is provided adjacent to the tank bracket 50. With this configuration, deformation of the cross member 30 and therefore the tank bracket 50 can be effectively suppressed. As a result, displacement of the belt anchor 22 can also be effectively suppressed.

[0032] As is clear from the above description, in this example, only the shapes of the anchor bracket 44 and the support bracket 60 are changed compared to the comparative example. In other words, in this example, no dedicated parts are added to suppress the displacement of the belt anchor 22. As a result, the displacement of the belt anchor 22 is effectively suppressed while the increase in the number of parts is suppressed. In addition, the anchor bracket 44 and the support bracket 60, the shapes of which are changed, are both small parts. In other words, the configurations of the floor panel 24 and the cross member 30, which are large parts, are not changed. Therefore, the influence on the entire vehicle can be kept small. In addition, in this example, the shape of the main bracket 51 is not significantly changed. Therefore, the mountability of the fuel tank 70 can be maintained as in the conventional case.

[0033] The configurations described above are all examples, and other configurations may be changed as long as they satisfy the configuration described in claim 1. For example, the shape and size of the support bracket 60 may be changed as appropriate as long as it overlaps with the fastening portion 23. [Explanation of symbols]

[0034] 10 seat belt device, 12 belt body, 14 tongue plate, 16 buckle, 18 buckle body, 20 connecting belt, 22 belt anchor, 23 fastening portion, 24 floor panel, 30 cross member, 42 cross space, 43 bulk, 44, 44* anchor bracket, 50 tank bracket, 51 main bracket, 52 bottom wall, 54 peripheral wall, 60, 60* support bracket, 62 skirt portion, 64, 64* flange portion, 66 connecting portion, 68 bead, 70 fuel tank, 80 fastening bolt, 82 weld nut, 84 rear seat.

Claims

1. A belt anchor provided at one end of a seat belt buckle; Floor panels and An anchor bracket joined to the floor panel; a tank bracket to which a fuel tank is fastened and which is joined to the floor panel; wherein the belt anchor is fastened together with the floor panel, the anchor bracket, and the tank bracket.

2. The belt anchor fastening structure according to claim 1, the floor panel, the anchor bracket, and the tank bracket are stacked in this order from above, The tank bracket has a bead adjacent to a fastening portion with the belt anchor and extending in the front-rear direction. A belt anchor fastening structure characterized by the above.

3. The belt anchor fastening structure according to claim 1, The tank bracket is a substantially box-shaped main bracket protruding downward from the floor panel; A support bracket; The support bracket comprises: a skirt portion overlapping a peripheral surface of the main bracket and joined to the main bracket; a flange portion extending in a direction parallel to the floor panel and overlapping the anchor bracket and the floor panel; A portion of the flange portion is spaced from the floor panel to form a space between the flange portion and the floor panel. A belt anchor fastening structure characterized by the above.

4. The belt anchor fastening structure according to any one of claims 1 to 3, further comprising: A cross member extending in a vehicle width direction and forming a cross space that is a closed space between the cross member and the floor panel; A bulk disposed in the cross space and spanning a front wall of the cross member and a rear wall of the cross member; Equipped with The tank bracket is joined to the cross member, The bulk is adjacent to the tank bracket in the front-rear direction. A belt anchor fastening structure characterized by the above.

5. The belt anchor fastening structure according to claim 4, The tank bracket is located in front of the cross member, A front end position of the anchor bracket is substantially the same as a front end position of the tank bracket, The distance from the fastening portion with the belt anchor to the rear end of the main bracket is substantially the same as the distance from the fastening portion to the front end of the tank bracket. A belt anchor fastening structure characterized by the above.

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