JP7035960B2 - Vehicle floor panel structure - Google Patents

Description

The present invention relates to a vehicle floor panel structure, and more particularly to a vehicle floor panel structure having a heavy object storage unit for storing heavy objects.

Conventionally, a floor panel of a vehicle having a heavy object storage unit for storing a heavy object is known. For example, Patent Document 1 discloses a floor panel of a vehicle having a spare tire pan for storing a spare tire as a heavy object. The spare tire pan in Patent Document 1 is provided with a front-rear circular bead, whereby the rigidity (strength) of the spare tire pan is improved.

Japanese Unexamined Patent Publication No. 2017-08787

FIG. 6A shows a side view of the floor panel of the conventional vehicle, and FIG. 6B shows a plan view of the floor panel of the conventional vehicle. The conventional heavy object accommodating portion includes a plate portion on which a heavy object is placed and a fastening bracket for fastening the heavy object to the plate portion. Further, as shown in FIG. 6B, a bead extending in the front-rear direction of the vehicle is provided on the plate portion in order to improve the rigidity of the plate portion, particularly the bending rigidity in the vertical direction of the vehicle.

Conventionally, a mount portion for jacking up may be connected to the lower side of such a heavy load accommodating portion. Specifically, as shown in FIGS. 6A and 6B, a jack-up mount portion may be connected to the lower side surface of the plate portion in front of the fastening bracket in the vehicle front-rear direction. In this case, the connection point between the plate portion and the mount portion is located in front of the fastening bracket in the vehicle front-rear direction. The plate portion and the mount portion are connected by a method such as spot welding.

Consider a case where an inertial force is input to the plate portion from a heavy object fastened to the plate portion by a fastening bracket due to vibration of a vehicle or the like. In particular, consider the case where the inertial force is a force in the vertical direction of the vehicle. When the rigidity of the plate portion is low, when an inertial force is input from the fastening bracket, the plate portion is deformed, so that the vertical displacement of the connection point between the plate portion and the mount portion does not become so large. That is, the connection point is not so loaded. However, when the rigidity of the plate is improved by the bead, the amount of deformation of the plate due to the inertial force is reduced, so that the plate as a whole is displaced in the vertical direction, and the connection point is displaced in the vertical direction. Will grow. That is, a large load is applied to the connection point.

If the bead is not provided on the plate portion, the load on the connection point due to the inertial force from a heavy object can be reduced. However, if the bead is not provided on the plate portion, the rigidity of the plate portion is lowered. When the rigidity of the plate portion decreases, the amount of deformation of the plate portion increases when the plate portion receives an upward force from the mount portion during jacking up, and as a result, the amount of tilting of the mount portion increases. The problem of getting rid of it can occur.

An object of the present invention is to reduce the load applied to the connection point between the plate portion and the mount portion for jacking up while suppressing the decrease in the rigidity of the plate portion of the heavy object storage portion to which the heavy object is fastened. ..

The present invention comprises a flat plate-shaped plate on which a heavy object is placed, a heavy object storage portion having a fastening bracket provided on the plate for fastening the heavy object to the plate, and the fastening bracket. In front of the vehicle in the front-rear direction, the plate portion includes a jack-up mount portion connected to the lower side surface of the plate portion, and the plate portion includes a front-rear bead having a bead side wall extending in the vehicle front-rear direction and a plate portion. A hyperbolic vehicle width direction in which both side walls face each other in a plan view, which is provided between the connection point between the and the mount portion and the fastening bracket and extends in the vehicle width direction so as to divide the inner bead side wall. It is a floor panel structure of a vehicle characterized by having a bead.

According to the above configuration, since the bead in the vehicle width direction is provided, the plate portion has some flexibility in bending in the vertical direction of the vehicle. As a result, when an inertial force is input from a heavy object fastened to the plate portion to the plate portion, bending occurs at the bead in the vehicle width direction, and vertical displacement at the connection point between the plate portion and the mount portion is suppressed. Will be done. That is, the load on the connection point is reduced. Further, in the plate portion, although the side wall of the bead is divided, the bead in the front-rear direction remains. Therefore, the decrease in the rigidity of the plate portion is suppressed. At least, the rigidity of the plate portion is higher than that in the case where there is no front-rear bead.

According to the present invention, it is possible to reduce the load applied to the connection point between the plate portion and the mount portion for jacking up while suppressing the decrease in the rigidity of the plate portion of the heavy object storage portion to which the heavy object is fastened. ..

It is a side view (a) and a plan view (b) of the floor panel structure of the vehicle which concerns on this embodiment. It is an enlarged plan view of the plate part of a heavy object storage part. It is a YZ end view of the plate part seen from the AA direction of FIG. It is the stress contour figure (a) of the conventional plate part and the stress contour figure (b) of the plate part which concerns on this embodiment when the inertial force is received from a heavy object. It is an enlarged plan view (a) of the plate part provided with the bead in the vehicle width direction of width L, and the end view (b) seen from the BB direction of FIG. 5A at the time of jacking up. It is a side view (a) and a plan view (b) of the floor panel structure of a conventional vehicle.

FIG. 1A is a side view of the floor panel structure 10 of the vehicle according to the present embodiment, and FIG. 1B is a plan view of the floor panel structure 10. In FIG. 1 (the same applies to FIGS. 2 to 5), the vehicle front-rear direction is the X-axis (the positive direction of the X-axis is the forward direction), the vehicle width direction is the Y-axis (the positive direction of the Y-axis is the right direction), and The vertical direction of the vehicle is the Z axis (the positive direction of the Z axis is the upward direction). In the present specification, the front-rear direction of the vehicle is simply referred to as front or rear, the left-right direction when facing the front direction of the vehicle is simply referred to as left or right, and the vertical direction of the vehicle is simply referred to as up or down.

The floor panel structure 10 is a structure of a rear floor panel arranged at the rear of the vehicle. Therefore, the floor panel structure 10 is arranged, for example, under the trunk. The floor panel structure 10 includes a heavy load storage portion 12, a mount portion 14, and a rear cloth portion 16.

The heavy load storage portion 12 has a bowl shape having a recess in the central portion. In the present embodiment, the heavy load storage unit 12 stores a spare tire as a heavy load. Therefore, the recess of the heavy load storage portion 12 is sized so that the spare tire can be just accommodated. The heavy load storage portion 12 includes a flat plate-shaped plate portion 12a on which a spare tire is placed. The plate portion 12a is the bottom plate of the bowl-shaped heavy load storage portion 12.

The plate portion 12a is provided with a fastening bracket 12b for fastening the spare tire to the plate portion 12a. Since the fastening bracket 12b locks the center of the wheel of the spare tire, it is provided substantially in the center of the plate portion 12a.

The mount portion 14 is a member for jacking up, and the bottom surface of the mount portion 14 serves as a jack up point. That is, the jack is pressed against the bottom surface of the mount portion 14, and the vehicle is jacked up by applying a force upward from the jack to the mount portion 14.

The mount portion 14 is connected to the lower side surface of the plate portion 12a. Specifically, the mount portion 14 has a flange having a shape along the lower side surface of the plate portion 12a, and the flange and the plate portion 12a are spot-welded to the mount portion 14 on the plate portion 12a. Is connected. Specifically, the electrode pins are brought into contact with the lower side surface of the flange of the mount portion 14 and the upper side surface of the plate portion 12a, and welding is performed by passing a large current through the electrode pins in a short time. As a result, the mount portion 14 and the plate portion 12a are connected by a plurality of connection points (striking points) at which the electrode pins are in contact with each other.

FIG. 1B shows a plurality of connection points 20 by spot welding. As shown in FIG. 1 (b), the plurality of connection points 20 are located in front of the fastening bracket 12b. That is, the mount portion 14 is connected to the lower side surface of the plate portion 12a in front of the fastening bracket 12b. In this embodiment, the mount portion 14 is connected to the lower side surface of the front end of the plate portion 12a. Therefore, the plurality of connection points 20 are located at the front end portion of the plate portion 12a.

The mount portion 14 is also connected to the lower side surface of the rear cross portion 16. That is, the mount portion 14 is connected so as to straddle the plate portion 12a and the rear cross portion 16. Similar to the connection to the plate portion 12a, the mount portion 14 and the rear cross portion 16 are connected by spot welding.

The rear cross portion 16 is a frame member extending in the vehicle width direction in front of the heavy load storage portion 12. In FIG. 1A, the rear cross section 16 is shown in an XZ cross section. The rear cross portion 16 has a shape in which two members having a U-shaped cross section are vertically overlapped, and the rigidity thereof is higher than that of the plate portion 12a.

FIG. 2 is an enlarged plan view of the plate portion 12a. The plate portion 12a is provided with a plurality of front-rear beades 30 and 32 extending in the front-rear direction in order to improve the rigidity of the plate portion 12a. The rigidity in the present specification mainly means the bending rigidity in the vertical direction. The flexural rigidity in the vertical direction means the rigidity of the XY plane against out-of-plane deformation. The bead is a groove portion (concave portion) or a ridge portion (convex portion) extending in one direction. In the present embodiment, the front-rear beades 30 and 32 are grooves.

The plurality of front-rear beades 30 and 32 are provided on the left and right sides of the fastening bracket 12b. Specifically, the front-rear bead 30 is provided on the right side of the fastening bracket 12b, and the front-rear bead 32 is provided on the left side of the fastening bracket 12b.

The front-rear bead 30 and 32 have side walls (bead side walls) at both ends in the width direction. Since the front-rear bead 30 and 32 have a shape extending in the front-rear direction, naturally, their side walls also extend in the front-rear direction. As shown in FIG. 2, the side wall of the front-rear bead 30 on the fastening bracket 12b side (that is, the left side) is referred to as a side wall 34, and the side wall of the front-rear bead 32 on the fastening bracket side (that is, the right side) is referred to as a side wall 36.

FIG. 3 is an end view of the plate portion 12a seen from the direction AA of FIG. 2, and the beads 30 and 32 in the front-rear direction are shown. As shown in FIG. 3, in the present embodiment, the side walls 34 and 36 are erected in the vertical direction, but the side walls 34 and 36 may be slopes. Specifically, the side wall 34 may be a slope facing the upper side and the right side (inside the front-rear bead 30), and the side wall 36 may be a slope facing the upper side and the left side (inside the front-rear bead 32). ..

Returning to FIG. 2, the plate portion 12a is further provided between the connection point 20 between the plate portion 12a and the mount portion 14 and the fastening bracket 12b, and is a vehicle width direction bead extending in the vehicle width direction (left-right direction). 38 is provided. The bead 38 in the vehicle width direction also has a groove portion like the beads 30 and 32 in the front-rear direction. When the front-rear direction beads 30 and 32 are the ridges, the vehicle width direction beads 38 are also the ridges.

The vehicle width direction bead 38 also has a side wall extending in the vehicle width direction, and as shown in FIG. 2, the side wall on the connection point 20 side (that is, the front side) of the vehicle width direction bead 38 is described as a side wall 40, and the vehicle width direction The side wall of the bead 38 on the side of the fastening bracket 12b (that is, the rear side) is referred to as a side wall 42.

The vehicle width direction bead 38 is provided so as to divide the pair of side walls 34 and 36. Specifically, the side wall 34 of the front-rear bead 30 is divided into a front side portion 34a and a rear side portion 34b, and the rear end of the front side portion 34a and the right end of the side wall 40 are connected to the front end of the rear side portion 34b. It is connected to the right end of the side wall 42. Further, the side wall 36 of the front-rear bead 32 is divided into a front side portion 36a and a rear side portion 36b, the rear end of the front side portion 36a and the left end of the side wall 40 are connected, and the front end of the rear side portion 36b and the side wall 42. It is connected to the left end. In the present embodiment, the front-rear direction bead 30 and the front-rear direction bead 32 are connected by the vehicle width direction bead 38.

The bead 38 in the vehicle width direction has a hyperbolic shape in which both side walls 40 and 42 face each other in a plan view. Specifically, the left-right central portion of the side wall 40 has a shape that protrudes rearward compared to the left-right end portion of the side wall 40, and the left-right central portion of the side wall 42 is the left-right direction of the side wall 42. It has a shape that protrudes forward compared to the end. As a result, the width of the bead 38 in the vehicle width direction is narrower in the central portion in the left-right direction than in the end portion in the left-right direction.

The structure of the floor panel structure 10 according to the present embodiment is as described above. According to the floor panel structure 10, since the bead 38 in the vehicle width direction is provided, the plate portion 12a has some flexibility in bending in the vertical direction. As a result, when an inertial force, which is a vertical force, is input from the spare tire fastened to the plate portion 12a to the plate portion 12a (particularly the fastening bracket 12b) due to, for example, vibration of the vehicle, the bead 38 in the vehicle width direction Bending occurs at the position, and the displacement of the connection point 20 in the vertical direction is suppressed. That is, the load on the connection point 20 is reduced. As a result, peeling of the connection point 20 and the like are prevented.

Further, since the bead 30 and 32 in the front-rear direction are left in the plate portion 12a, the decrease in the rigidity of the plate portion 12a is suppressed. At least, the rigidity of the plate portion 12a is higher than that in the case where the beads 30 and 32 in the front-rear direction are not provided.

FIG. 4A shows a stress contour diagram of the conventional plate portion when the inertial force is received from the spare tire, and FIG. 4B shows the plate portion 12a when the inertial force is received from the spare tire. A stress contour diagram is shown. In FIGS. 4A and 4B, the plain portion represents a weak stress, the shaded portion represents a slightly strong stress, and the shaded portion represents a considerably strong stress.

As shown in FIG. 4A, when the conventional plate portion, that is, the plate portion is provided with the bead in the front-rear direction and the bead in the vehicle width direction is not provided, the connection is made by the inertial force from the spare tire. It can be seen that the stress at or near the point 20 is considerably strong. On the other hand, as shown in FIG. 4B, when the plate portion 12a in the present embodiment, that is, the bead 38 in the vehicle width direction is provided, the plate portion 12a is connected when an inertial force is received from the spare tire. It can be seen that the stress at or near the point 20 is weakened. In particular, while the stress around the connection point 20 becomes weaker, the portion of the bead 38 in the vehicle width direction where the stress is strong extends in the vehicle width direction. This indicates that when the plate portion 12a receives an inertial force from the spare tire, the plate portion 12a bends at the bead 38 in the vehicle width direction, so that the stress around the connection point 20 is reduced.

Hereinafter, the effect of the bead 38 in the vehicle width direction having a hyperbolic shape will be described.

As described above, the mount portion 14 is connected so as to straddle the plate portion 12a and the rear cross portion 16 (see FIG. 1A), and the rigidity of the plate portion 12a is smaller than the rigidity of the rear cross portion 16. .. Therefore, when an upward force is applied to the mount portion 14 when the vehicle is jacked up, the plate portion 12a is more easily deformed than the rear cross portion 16, and the mount portion 14 is moved to the rear side due to the deformation of the plate portion 12a. I will fall down. The lower the rigidity of the plate portion 12a, the larger the amount of deformation of the plate portion 12a at the time of jacking up, and the more the mount portion 14 collapses to the rear side.

When the bead 38 in the vehicle width direction is provided, the rigidity of the plate portion 12a is lowered as compared with the case where the bead 38 in the vehicle width direction is not provided. Here, as will be described below, the larger the width of the bead 38 in the vehicle width direction, the lower the rigidity of the plate portion 12a.

FIG. 5A is an enlarged perspective view of the plate portion 12'a when a bead 38'in the vehicle width direction having a width L is provided. FIG. 5B is an end view seen from the direction BB of FIG. 5A at the time of jacking up. FIG. 5B shows how the plate portion 12'a is deformed by the force applied from the mount portion 14 at the time of jacking up, and the mount portion 14 is tilted backward.

When the plate portion 12'a receives a force from the mount portion 14 during jacking up, a backward in-plane force 60a is applied to the plate portion 12'a. Further, a forward in-plane force 60b is applied to the plate portion 12'a as a reaction force of the in-plane force 60a. When the in-plane forces 60a and 60b are applied to the plate portion 12'a, vertical bending occurs at the vehicle width direction bead 38'(specifically, the side wall of the vehicle width direction bead 38'). Then, the height of the front portion of the plate portion 12'a from the vehicle width direction bead 38'and the height of the rear portion of the plate portion 12'a from the vehicle width direction bead 38' are deviated from each other. As a result, the in-plane force 60a and the in-plane force 60b are eccentric. In FIG. 5, the amount of eccentricity between the in-plane force 60a and the in-plane force 60b is represented by E.

Here, the larger the width L of the bead 38'in the vehicle width direction, the larger the eccentricity E. That is, the eccentricity E is proportional to the width L. Further, the larger the eccentricity E, the larger the couple moment applied to the plate portion 12'a, and as a result, the plate portion 12'a is more easily deformed by the in-plane forces 60a and 60b. That is, the larger the width L, the more easily the plate portion 12'a is deformed, that is, the rigidity becomes smaller, and conversely, the smaller the width L, the more difficult the plate portion 12'a is deformed, that is, the higher the rigidity.

Therefore, considering the rigidity of the plate portion 12a, it is preferable that the width of the bead 38 in the vehicle width direction is as narrow as possible. On the other hand, if the width is narrowed, there arises a problem that processing for providing the bead 38 in the vehicle width direction becomes difficult. Therefore, in the present embodiment, the width of the bead 38 in the vehicle width direction can be narrowed as much as possible (that is, the decrease in the rigidity of the plate portion 12a can be suppressed as much as possible), and the bead in the vehicle width direction can be ensured for ease of processing. The shape of 38 is a hyperbolic shape.

Although the embodiments according to the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, in the present embodiment, the heavy object is a spare tire and the important object storage unit stores the spare tire, but the weight unit is not limited to the spare tire and may be another object.

10 Floor panel structure, 12 Heavy load storage section, 12a plate section, 12b fastening bracket, 14 mount section, 16 rear cross section, 20 connection points, 30, 32 front-rear bead, 34, 36, 40, 42 side wall, 38 vehicle width Direction bead.

Claims (1)

A flat plate-shaped plate on which a heavy object is placed, and a heavy object storage unit having a fastening bracket provided on the plate for fastening the heavy object to the plate.
A jack-up mount portion connected to the lower side surface of the plate portion in front of the fastening bracket in the vehicle front-rear direction,
Equipped with
The plate part
A front-rear bead with a bead side wall extending in the front-rear direction of the vehicle,
A hyperbolic shape that is provided between the connection point between the plate portion and the mount portion and the fastening bracket and extends in the vehicle width direction so as to divide the inner bead side wall, and both side walls face each other in a plan view. Bead in the width direction and
Have,
The floor panel structure of the vehicle is characterized by that.

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