JPH0141660Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a front floor structure for a vehicle that prevents the tunnel part, the welded part between the front floor and the rear floor, etc. from being affected by the impact load acting on the seat belt anchor part during a vehicle collision. .

FIG. 4 is a side view showing a conventional front floor structure, in which a tunnel portion 41 having an inverted U-shaped cross section and extending in the front-rear direction is formed in the front floor 40, and a tunnel portion 43 is also formed in the rear end portion of the front floor 40. The front end portion of the rear floor 42 on which the rear floor 42 is formed is joined at spot welds 45 . A bracket 46 for attaching a seat and a connection point 48 for a buckle 47 provided at the seat belt anchor are provided on the side surface of the tunnel portion 41 of the front floor 40, and the bracket 46 connects the side surface of the tunnel portion 41 and the floor. fixed to the surface 49 by welding,
The connecting point 48 is provided by connecting the buckle 47 to the side surface of the tunnel portion 41 and a reinforcing plate 50 welded to the inner surface of the tunnel portion 41 using bolts 51 and nuts.

In the front floor structure as described above, in the event of a head-on collision of the vehicle, the impact load F acting on the seatbelt anchor connection portion 48 will be transmitted to the tunnel portion 41, and the reinforcement plate 50 will move upward. As the upper surface of the tunnel part 41 is pushed up, the tunnel part 41 has a tendency to bulge and deform by a large amount of protrusion as shown by the chain line 41', and the front floor 40 is pulled forward by the horizontal component of the load F. Because of the tension, the load F also affects the welded portion 45 between the front floor 40 and the rear floor 42 and the rear floor 42.

The present invention was developed in order to solve the above-mentioned conventional problems.The purpose of the present invention is to prevent upward bulging deformation of the tunnel portion even if an impact load is applied to the seat belt anchor connection point. To provide a front floor structure for a vehicle which is advantageous in terms of the floor structure of a vehicle, since it can prevent shock loads from affecting the welded part between the front floor and the rear floor and the rear floor.

In order to solve the above problems and achieve the purpose, the present invention provides the above-mentioned front floor structure of a vehicle in which a seat mounting bracket and a seat belt anchor connection point are provided on the side of a tunnel portion formed in the front floor. A vertical step is formed on the floor surface of the front floor between the seat mounting bracket and the seatbelt anchor connection point by a bent surface that is convex at the bottom, and the front floor behind the seatbelt anchor connection point The floor surface of the vehicle is characterized by a horizontal bead portion that is wave-shaped in the front-rear direction.

In this way, a vertical step is formed on the floor surface of the front floor between the seat mounting bracket and the seat belt anchor connection point by a curved surface that is convex at the bottom, so that in the event of a collision, etc. Since the upper and lower steps formed on the floor surface with a curved surface convex at the bottom are vulnerable parts, if a forward impact load is applied to the seatbelt anchor attachment point, the lower part of the floor surface will move downward. The upper and lower step portions formed by the convex curved surfaces are deformed, and the seat belt anchor attachment point can be easily moved forward.

In addition, a horizontal bead section that is corrugated in the front-rear direction is formed on the floor surface of the front floor behind the seatbelt anchor connection point, so that the deformation of this horizontal bead section causes the seatbelt anchor to move forward to the front of the seatbelt anchor attachment point. The negative impact on the rear floor side caused by the movement of the vehicle is absorbed.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a plan view of the structure according to the present invention, in which a tunnel portion 11 that opens downward and has an inverted U-shape in cross section is formed in the center of the front floor 10 in the left-right direction, and the rear end of the front floor 10 rear floor 1
2 are joined by spot welding parts 13..., thereby connecting the tunnel part 11 of the front floor 10 and the tunnel part 14 of the rear floor 12, which extend in the longitudinal direction and which house the propulsion shaft of the vehicle, etc. The respective tunnel portions 11 and 14
Floor surfaces 15,1 of the front floor 10 on the left and right sides of
5 and the floor surfaces 16, 16 of the rear floor 12 are unfolded.

A bracket 17 for attaching a driver's seat or a passenger seat to the front floor 10 is provided on the side surface of the tunnel section 11 of the front floor 10. Edge is floor surface 15
Since the brackets 17 and 17 are welded together and connected to the seat frame via seat slide rails (not shown), the bonding strength around the bracket 17 is high. Furthermore, seatbelt anchor connection points 18, 18 are provided on the side surface of the tunnel portion 11, located behind the seat mounting bracket 17, and the connection points 18, 18 are connected to the tunnel portion 11.
The buckles 20, 20 of the anchor parts of the driver's and passenger's seat belts are connected to the side of the tunnel part 11 and the reinforcing plate 19 with bolts 21, 21 and nuts. . In this embodiment, as shown in FIG. 3, the reinforcing plate 19 is fitted into the tunnel portion 11 with a space S between the upper surface 19b of the bulge portion 19a having an inverted U-shaped cross section and the upper surface 11a of the tunnel portion 11. Further, the lower ends of the bulging portions 19a are extended portions 19c, 19c extending laterally to the lower surfaces of the floor surfaces 15, 15, and the extending portions 19c, 19c are welded to the floor surfaces 15, 15.

As shown in Fig. 2, there is a vertical step 22 with a height H between the seat mounting bracket 17 and the seat belt anchor connection point 18, and the seat mounting bracket 17 is on the upper side, and the seat belt anchor is connected to the seat belt anchor. The joint portion 18 is provided on the lower side. Specifically, the step 22 connects the downwardly open weakened portion 23 of the front floor 15 to the seat mounting bracket 17 and the seat belt anchor connection point 18.
The fragile part 2 is provided by forming between
A front floor portion 24 on the rear side of the seat belt 3 and in front of the seat belt anchor connection portion 18 has a downwardly convex curved surface. Also, the front floor 1 behind the seat belt anchor connection point 18
A horizontal bead portion 25 extending in the left-right direction is formed on the floor surface 15 of No. 0, and a plurality of horizontal bead portions 25 are formed continuously in the front-rear direction. It is formed into a wave shape.

During a vehicle collision, when an impact load F acts on the seatbelt anchor connection point 18, the seatbelt anchor connection point 18 moves forward due to the step 22 caused by the weakened portion 23 compared to the conventional structure shown in FIG. Therefore, by appropriately setting the upper and lower steps as shown in FIG. It moves forward and stops when it approaches the seat mounting bracket 17. Therefore, it is possible to avoid large upward bulging deformation of the tunnel portion 11 due to the high rigidity near the seat mounting bracket 17. Furthermore, in this embodiment, as described above, since the distance S is secured between the upper surface 19b of the reinforcing plate 19 and the upper surface 11a of the tunnel part 11, the reinforcing plate 19 does not push up the tunnel part 11, and the reinforcement The board 19 has floor surfaces 15, 15
Since the extending portions 19c, 19c are formed to extend laterally on the lower surface of the front floor 10, the area of the front floor 10 supporting the vertical component of the impact load F is expanded, and the
The energy caused by this is absorbed by the large area of the front floor 10 being slightly lifted and deformed, rather than being lifted up locally to a large extent.

Also, since the floor surface 15 behind the seatbelt anchor connection point 18 is formed with horizontal bead portions 25 that are undulating in the front-rear direction, even if the connection point 18 moves forward as described above, The movement is absorbed by the expansion of the horizontal bead portions 25,
Therefore, forward movement of the joining point 18 does not affect the welded portion 13 between the front floor 10 and the rear floor 12 and the rear floor 12.

As is clear from the above explanation, according to the present invention,
Since a vertical step is formed on the floor surface of the front floor between the seat mounting bracket and the seat belt anchor connection point by a curved surface that is convex at the bottom, in the event of a collision, etc., the lower part formed on the floor surface Since the upper and lower steps due to the convex curved surface are vulnerable parts, if a forward impact load is applied to the seat belt anchor attachment point, the upper and lower steps due to the downwardly convex curved surface of the floor surface will be affected. The stepped portion is deformed, and the seat belt anchor attachment point can be easily moved forward, thereby preventing the tunnel portion from bulging upward and deforming significantly. Because a horizontal bead section with a waveform in the front-rear direction is formed on the floor surface of the front floor behind the anchor connection point, the deformation-absorbing action of the horizontal bead section reduces impact loads to the weld between the front floor and rear floor and to the rear floor. This is extremely effective as a countermeasure for floors against impact loads caused by vehicle collisions.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view showing the structure of the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a sectional view taken along the line 3-3 of FIG. FIG. 4 is a diagram similar to FIG. 2 showing a conventional example. In the drawings, 10 is a front floor, 11 is a tunnel portion, 15 is a floor surface, 17 is a seat mounting bracket, 18 is a seat belt anchor connection point, 22 is a step, and 25 is a horizontal bead portion.

Claims (1)

[Scope of Claim for Utility Model Registration] In a front floor structure of a vehicle in which a seat mounting bracket and a seat belt anchor connection point are provided on the side of a tunnel portion formed in the front floor, the seat mounting bracket and the seat belt anchor mentioned above are provided. A vertical step is formed on the floor surface of the front floor between the seatbelt anchor connection point by a bent surface that is convex at the bottom, and a waveform is formed in the front-rear direction on the floor surface of the front floor behind the seatbelt anchor connection point. A vehicle front floor structure characterized by forming a horizontal bead portion.