CN100389040C - Body Floor Structure - Google Patents

Abstract

The present invention provides a vehicle body floor structure whose rigidity against external force from the side of the vehicle body is improved. The floor (10) in this car body floor structure is formed by a pair of left and right side beams (1, 1) and a pair of front and rear cross beams (2A, 1) orthogonally arranged to the pair of side beams (1, 1). 2B) Enclosing, a reinforcing rib (20) is formed on the floor, and the reinforcing rib is in the shape of a concentric circular arc centered at the orthogonal connection portion (O1, O2) of the side beam and the cross beam. In addition, reinforcement members (41, 42) are provided at corners formed by the side beams and the cross beams, and the reinforcement members are installed and connected obliquely to the side beams and the cross beams.

Description

Body Floor Structure

technical field

The present invention relates to a vehicle body floor structure of an automobile, and more particularly to a vehicle body floor structure capable of appropriately distributing collision loads from the side.

Background technique

Conventionally, for a vehicle body floor structure having a floor such as an automobile floor, for example, a technique disclosed in JP-A-6-107234 is known as a technique for increasing the rigidity of the floor.

As shown in FIG. 7 , the floor 30 in the vehicle body floor structure described in JP-A-6-107234 has a structure including a plurality of longitudinal ribs 31 along the front-rear direction X of the vehicle body (not shown), and A plurality of horizontal ribs 32 perpendicular to the vertical ribs 31 in the left-right direction Y of the vehicle body shown in the figure. The cross-sectional shape of the vertical rib 31 viewed from the front-rear direction X of the vehicle body is a triangle not shown in the figure. In addition, the horizontal rib 32 is formed in a state of crossing the above-mentioned vertical rib 31 and has a concave-convex shape composed of a bottom 32a and a top 32b. Continuous and roughly rhomboid in plan view. The inclined portion 32c is formed on the periphery of the horizontal bead 32 , whereby the top 32b of the horizontal bead 32 is formed in a shape protruding upward from the top 31b of the vertical bead 31 .

In addition, in the existing car body floor structure, the side beams are welded and joined on both sides of the floor, and the beams extending in the left and right directions of the car body are welded and joined to the front and rear of the floor, and can also be welded and joined to the middle of the floor if necessary. . In recent years, in order to increase the strength and rigidity of a vehicle, it has been considered to increase the strength against a side collision and to disperse the side collision load. In the invention disclosed in Japanese Unexamined Patent Application Publication No. 2004-314729, for example, the beam provided in the center of the floor penetrates and is continuously installed in the tunnel formed in the center of the vehicle to improve the strength against side impact load and distribute the load.

However, as shown in FIG. 7 , an external force from the side of the vehicle body, such as a load applied when a collision load F is applied, spreads radially on the floor 30 as indicated by arrow D in the figure with the center of the circle where the load is applied. In the above-mentioned existing car body floor structure, the longitudinal rib 31 and the transverse rib 32 are perpendicular to each other, and the transverse rib 32 is roughly rhombus-shaped in plan view with a thinned part (top 32b), so when there is When the collision load F from the side of the vehicle body is applied, there is a problem that deformation is likely to occur centering on the narrowed portion of the lateral rib 32 .

In addition, there are other problems in the above-mentioned existing car body floor structure, that is, the junction between the side beam and the cross beam is made by making the front end of the cross beam contact the side of the side beam, and then only welded. , the impact load from the side applied to the side beam cannot be transmitted to the cross beam, and the junction between the side beam and the cross beam is easily deformed.

In order to prevent this deformation, it is conceivable to increase the plate thickness of the parts or to increase the strength by providing a large reinforcing part, but this may increase the weight of the vehicle body, resulting in an increase in fuel consumption. Therefore, there is a need for a high-strength floor structure that is as light as possible.

Contents of the invention

Therefore, it is an object of the present invention to provide a vehicle body floor structure that can increase the rigidity against external force from the side of the vehicle body and efficiently transmit the external force from the side of the vehicle body to the beam.

The vehicle body floor structure of the technical solution 1 of the present invention which can solve the above-mentioned problems has a floor surrounded by a pair of left and right side beams and a pair of front and rear cross beams erected between the left and right pair of side beams. , wherein, a reinforcing rib is formed on the above-mentioned floor, and the reinforcing rib is in the shape of a concentric circular arc with the corner portion perpendicular to the aforementioned side beam and the aforementioned cross beam as the center.

By adopting the invention described in technical solution 1, a concentric arc-shaped reinforcement with the vertical intersection of the side beam and the beam as the center is formed on the floor surrounded by the left and right pair of side beams and the front and rear pair of beams. When the collision load is applied through the side beams, since the reinforcement ribs are provided with the same directionality as the load propagation direction, the reinforcement ribs can bear the collision load in the state of supporting the load, thereby suppressing the deformation of the floor. Therefore, a vehicle body floor structure that resists external force from the side of the vehicle body and has increased rigidity is obtained.

The invention of claim 2 is based on the vehicle body floor structure described in claim 1, wherein a plurality of the reinforcing ribs are formed at equal intervals.

By adopting the invention described in claim 2, since a plurality of reinforcing ribs are provided at equal intervals, local deformation of the floor due to stress concentration can be effectively prevented.

The invention described in claim 3 is based on the vehicle body floor structure described in claim 1 or 2, and the floor is reinforced by a floor tunnel extending front and rear in the center of the vehicle body.

According to the invention described in claim 3, the rigidity of the floor structure of the vehicle body is further improved because the floor is reinforced by the tunnel extending front and rear in the center of the vehicle body.

In the invention described in claim 4, on the basis of the vehicle body floor structure described in any one of claims 1 to 3, the floor is reinforced by a floor beam, at least an end of which is fixed to the aforementioned On the left and right side beams.

By adopting the invention described in technical solution 4, since the floor is reinforced by floor beams whose ends are fixed at least on the pair of left and right side beams, it can effectively resist the external force applied to the side beams, and the car body floor structure The rigidity is further improved.

By adopting the vehicle body floor structure of the present invention, the rigidity against the external force from the side of the vehicle body can be improved, and the side impact load acting on the side beam can be effectively transmitted to the cross beam. In addition, the use of such a vehicle body floor structure can omit the reinforcing parts provided on the side beams, which contributes to the weight reduction of the vehicle.

Description of drawings

FIG. 1 is a perspective view mainly showing a vehicle body structure around a vehicle compartment, and is used to explain a vehicle body floor structure according to a first embodiment of the present invention.

Fig. 2 is also a plan view showing the main part of the vehicle body.

FIG. 3 is a diagram showing a rib in cross section.

4( a ) to ( d ) are schematic diagrams of the test, and FIG. 4( e ) is the measurement result.

5( a ) to ( c ) are cross-sectional views showing modified examples of ribs.

Fig. 6 is a plan view showing a main part of a vehicle body of another example.

Fig. 7 is a schematic diagram of the prior art.

8 is an overall perspective view showing a vehicle body floor structure according to a second embodiment.

Fig. 9 is a partial enlarged perspective view of Fig. 8, Fig. 9(a) shows the right front part, and Fig. 9(b) shows the right rear part.

Fig. 10 is a plan view of the floor structure for explaining the operation of the floor structure of the second embodiment.

Fig. 11(a) and (b) are enlarged perspective views showing a first reinforcing member of a modified example.

Detailed ways

(first embodiment)

The vehicle body floor structure according to the first embodiment of the present invention will be described in detail below with reference to the drawings. The front, rear, left, right and up and down directions in the description mean that the floor constituting the main part of the floor structure of the car body is installed on the pair of left and right side beams and the pair of front and rear beams constituting the car body. The state is used as the reference, and the direction seen by the driver of the vehicle is used as the reference.

In the accompanying drawings, FIG. 1 is a perspective view mainly showing a vehicle body structure around a cabin, and is used to explain a vehicle body floor structure according to a first embodiment of the present invention. Fig. 2 is also a plan view showing the main part of the vehicle body.

As shown in FIG. 1 , the vehicle body floor structure 100a of the first embodiment has a substantially quadrilateral floor 10 composed of a pair of side rails 1 and 1 arranged on the left and right sides of the vehicle body A and a pair of side beams 1 and 1 erected on the left and right sides of the vehicle body A. A pair of front and rear crossbeams between a pair of side beams 1 and 1 are surrounded by a front crossbeam 2A and a rear crossbeam 2B.

In addition, the floor 10 is reinforced by a tunnel 11 that is located at the central portion of the front beam 2A and the rear beam 2B and extends forward and backward.

In addition, the floor 10 is reinforced by floor cross beams 3, 3 which connect the left and right side beams 1, 1 and the central part of the tunnel 11 and extend in the left and right directions.

The left and right side beams 1, 1, the front beam 2A, the rear beam 2B, and the floor beams 3, 3 all form a closed cross-sectional shape by more than two layers of components.

In addition, two front seats, left and right, not shown, are provided above the substantially central portion of the floor 10 (approximately above the floor beams 3, 3), and above the rear of the floor 10 (approximately above the rear beam 2B). Above) there are rear seats not shown.

In addition, a pair of left and right front side frames 4, 4 are extended in front of the front cross member 2A, and a pair of left and right rear side frames 5, 5 are extended behind the rear cross member 2B. Left and right a pair of front side frame 4,4 its rear end is combined with the unillustrated front portion of left and right pair of side beams 1,1, in addition, left and right pair of rear side frame 5,5 its front end and The rear parts of the left and right pair of side beams 1 and 1 are combined.

A pair of left and right side beams 1, 1 are provided in the front and rear direction of the vehicle body A along the left and right sides of the floor panel 10, and the floor panel 10 is connected to the pair of left and right side beams 1, 1 by welding, for example. the inner part of. In addition, on the pair of left and right side beams 1, 1, center pillars 6, 6 are fixed behind the parts O3, O3 where the floor beams 3, 3 are attached. The side beams 1, 1 can also be arranged adjacent to the floor frames arranged at both ends of the floor 10 along the front-rear direction. Components, only one side beam 1 will be described.

The center columns 6 and 6 are not shown in detail in the figure, and their structure is that the closed section is formed by the outer column part and the inner column part, both of which are roughly hat-shaped in section, and a column reinforcement part is arranged inside the closed section for reinforcement.

As previously mentioned, the floor 10 is surrounded by a pair of left and right side beams 1, 1, a front beam 2A, and a rear beam 2B. There are 4 floor surfaces in total on the right.

In the first embodiment, the concentric arc-shaped reinforcing ribs 20 protrude from these floor surfaces respectively. The ribs 20 are centered at the part 01 (corner) where the side beam 1 and the front beam 2A are orthogonally joined, or the part O2 (corner) where the side beam 1 and the rear beam 2B are orthogonally joined as the center, and are spaced at equal intervals. It is formed into a plurality of concentric circular arcs. That is, the ribs 20 are formed in a corrugated state spreading from the four corners of the floor 10 toward the floor surface. In addition, the orthogonally joined portions O1 and O2 also include the vicinity of the orthogonally joined portions O1 and O2.

As shown in FIG. 2 , the rib 20 formed in this way has its end 21 arranged substantially perpendicularly to the side beam 1 in plan view, and the rib 20 extends toward the center of the floor panel 10 in an arc shape. In addition, in the vicinity of the front beam 2A and the rear beam 2B, the rib 20 extends in an arc shape toward the front beam 2A and the rear beam 2B. That is, the rib 20 is formed on the floor 10 so as to have substantially the same direction as the propagation direction of the collision load F applied via the side rail 1 (the direction indicated by the arrow D in FIG. 2 ) as described later.

In the first embodiment, the bead 20 is formed on substantially the entire floor surface of the floor 10, and, as shown in FIG. 3 , its cross-sectional shape is a semicircle having the same thickness as the floor surface.

Next, the operation of the vehicle body floor structure 100 a having the above-mentioned structure will be described mainly with reference to FIG. 2 when a collision load F is applied to the side rail 1 . Here, a case where the collision load F is applied to the side rail 1 via the center pillar 6 will be described.

As shown in FIG. 2 , when a collision load F is applied to the side beam 1 via the center pillar 6 due to a side collision or the like, the load is transmitted from the lower end of the center pillar 6 to the side beam 1 and spreads radially on the floor 10 (arrow D direction shown) propagation. In other words, it propagates in a corrugated form on the floor 10 as indicated by the dashed-two dotted line in the figure.

As mentioned above, since the concentric arc-shaped ribs 20 centered on the portion O2 are formed on the panel surface of the floor 10, the load spread on the floor 10 is borne by the plurality of ribs 20, respectively. That is, since the ribs 20 are provided such that their extending directions are substantially perpendicular to the corrugations shown by the dashed-dotted lines, the ribs 20 exert supportive resistance against loads, thereby suppressing deformation of the floor panel 10 . In order to confirm this, the inventors performed the following simulation experiments.

As shown in Figure 4(a)~(d), this simulation test was carried out by applying a forced displacement of the center pillar 6 from the outside to the inside of the vehicle body at a speed of 14 m/s. The bearing load is measured. The floor 10 has a uniform thickness.

As a comparative example, a vehicle body floor structure using a floor 10A without ribs (see FIG. 4(b)) and a floor 10B with linear ribs 20B extending in the left and right directions of the vehicle body were separately prepared. The vehicle body floor structure (refer to FIG. 4(c)), adopt the vehicle body floor structure (refer to FIG. Same assay. The measurement results are shown in Fig. 4(e).

Comparing the vehicle body floor structure 100a of the first embodiment shown in FIG. 4(a) with the vehicle body floor structure of the comparative example shown in FIGS. 4(b) to (d), it can be seen from FIG. 4(e) that The load measured from the vehicle body floor structure 100a of the first embodiment is significantly large, and the rigidity of the floor 10 can be effectively improved. It should be pointed out that the rigidity of the vehicle body floor structure 100a is about 1.5 times that of the vehicle body floor structure with reinforcing ribs 20B in FIG. The propagation direction of the impact load F on the side of the body.

By adopting the vehicle body floor structure 100a of the above-mentioned first embodiment, since the floor 10 surrounded by the pair of left and right side beams 1, 1 and the front beam 2A and the rear beam 2B is provided with a reinforcing rib 20, and the reinforcement The ribs 20 have the same directionality as the propagation direction of the collision load F input via the side rails 1 , 1 , and therefore, the ribs 20 support the load and suppress deformation of the floor panel 10 . Therefore, this vehicle body floor structure can resist the collision load F from the side of the vehicle body, and the rigidity is improved.

In addition, since a plurality of ribs 20 are provided at equal intervals, local deformation of the floor panel 10 caused by stress can be effectively prevented.

Furthermore, since the floor 10 is reinforced through the channel 11 extending forward and backward at the center of the vehicle body A, the rigidity of the vehicle body floor structure is further improved.

In addition, since the floor 10 is reinforced by the floor beams 3, 3 fixed at least at the ends to the pair of left and right side beams 1, 1, the impact load F applied to the side beams 1, 1 can be effectively resisted. The rigidity of the body floor structure has been further increased.

(second embodiment)

Next, a vehicle body floor structure according to a second embodiment of the present invention will be described in detail with reference to the drawings.

In the second embodiment, the same components as those in the first embodiment are denoted by the same symbols.

Fig. 8 is an overall perspective view showing a vehicle body floor structure 100b according to the second embodiment. Fig. 9 is a partially enlarged perspective view of Fig. 1, Fig. 9(a) showing the right front part, and Fig. 9(b) showing the right rear part. In addition, similar to the first embodiment, the front, rear, left, right, up, and down directions mentioned in the description of the second embodiment are based on the fact that the floor constituting the main part of the floor structure of the vehicle body is installed on the floor that constitutes the vehicle body. The state on the left and right pair of side beams and the front and rear pair of beams is used as a reference, and furthermore, the direction seen by the driver of the vehicle is used as a reference.

As shown in FIG. 8 , the vehicle body floor structure 100b of the vehicle body B includes: a floor 10 constituting the floor of the vehicle compartment; beam. Each side girder 1, 1 and each cross girder all form a closed cross-section by parts with more than two layers.

The beams in the second embodiment include: a front beam 2A, which is joined to the lower portion of the dash panel 35 at the front portion of the floor 10; The position of the lower part of (not shown) extends in the left-right direction; the rear beam 2B is joined to the rear of the floor 10 and extends in the left-right direction. Each beam is arranged in a direction orthogonal to the corresponding side beam 1, and the left and right side beams 1, 1, the front beam 2A and the rear beam 2B form a rectangular frame in plan view. In addition, the dash cross member 2A may be integrally formed with a dash panel 35 that partitions the vehicle compartment from the inside of the engine hood as a dash cross member. In addition, the pair of side beams 1, 1 may also be formed adjacent to the floor frame provided on both sides of the floor 10 in the front-rear direction, but in the second embodiment, as a joint with the floor frame, it is provided in the front-rear direction. The components on both sides of the floor 10 will only be described for one side beam 1 .

In order to improve the rigidity of the floor 10 , a channel 11 extending forward and backward is formed at the center of the floor 10 in the left-right direction. Furthermore, the two front side frames 4 extending forward and the two rear side frames 5 extending rearward are joined to the lower surface of the floor panel 10 .

At the corners O1 where the left and right side beams 1, 1 are connected to the front beam 2A, there are provided first reinforcement members 41 which are arranged obliquely relative to them and engaged with them.

As shown in FIG. 9(a), the first reinforcement member 41 includes: a sloped portion 41a; a side wall 41b connected to the sloped portion 41a and extending upward along the inner side surface 1a of the side rail 1 (the surface on the inner side of the vehicle compartment); The wall 41c is connected to the slope portion 41a and extends upward along the inner side surface 2Aa (surface on the side inside the vehicle compartment) of the front cross member 2A.

The inclined portion 41a is formed along a plane extending from the straight line D1 to the coupling point C1. The straight line D1 obliquely connects the side beam 1 on the floor 10 with the front beam 2A, and the joint point C1 is the joint point of the upper surface of the side beam 1 and the front beam 2A. That is, the inclined portion 41a slantly abuts on the corner formed by the inner side 1a of the side rail 1, the inner side 2Aa of the front beam 2A, and the floor 10, and forms a tetrahedron together with these members.

A flange 41d extending along the floor 10 is formed at the lower end of the slope portion 41a, a flange 41e is formed at the upper end of the side wall 41b along the upper surface of the side beam 1, and a flange 41f is formed at the upper end of the front wall 41c along the upper surface of the front beam 2A. .

Also, the respective flanges 41d, 41e, 41f are spot-welded to the "+" marks on the floor panel 10, the side rail 1, and the front beam 2A, respectively.

A left-front symmetrical first reinforcing member 41 (reinforcing member) is similarly provided at the left front joint portion of the side rail 1 and the front cross member 2A.

In this way, the first reinforcement member 41 is provided at the corner formed by the side rail 1 and the front cross member 2A, and reinforces the junction between them. The first reinforcing member 41 is not limited to the shape shown in FIG. 9( a ), and may be formed so as to extend and be welded to the front side frame 4 .

As shown in FIG. 8 , second reinforcing members 42 (reinforcing members) that are disposed obliquely relative to them and joined are provided at the corners where the left and right side rails 1 and the rear cross member 2B are joined.

The rear beam 2B is cut before reaching the side rail 1, and the second reinforcement member 42 is obliquely connected to the side rail 1 to extend the side rail 1 in the left-right direction.

As shown in FIG. 9( b ), the second reinforcement member 42 includes: an upper surface portion 42 a extending along the upper surface of the rear cross member 2B at the vehicle central side in the left-right direction, and extending obliquely forward on both sides of the vehicle; a front wall 42 b , which extend downward from the front end of the upper surface portion 42a.

A flange 42c is formed along the floor panel 10 from the lower end of the front wall 42b, and a flange 42d extending forward from the side of the vehicle side along the inner surface 1a of the side rail 1 is formed, and a flange 42d extending forward from the side of the vehicle side of the upper surface portion 42a along the side rail is formed. A flange 42e extending from the upper surface of 1. The respective flanges 42c, 42d, 42e are spot-welded at the "+" marks on the floor 10, the inner side surface 1a of the side rail 1, and the upper surface of the side rail 1, respectively. A left-right symmetrical second reinforcing member 42 is similarly provided at the left rear joint portion of the side rail 1 and the rear cross member 2B.

In this way, the second reinforcement member 42 is provided at the corner formed by the side rail 1 and the rear cross member 2B, and reinforces the junction between them.

The same ribs as the ribs 20 described in the first embodiment are formed on the floor panel 10 of the second embodiment. As shown in FIG. 8 , on the floor 10, a plurality of reinforcing ribs 20 are formed extending along concentric arcs with the portion (corner) O1 where the side beam 1 and the front beam 2A are orthogonally joined as the center, and the side beam 1 The corner portion orthogonal to the rear beam 2B is the center of the circle, extending along concentric arcs to form a plurality of reinforcing ribs 20 . The cross-section of the reinforcing rib 20 may be a typical semicircle, and may also be trapezoidal or mountain-shaped.

Next, the effects of the vehicle body floor structure of the second embodiment configured as described above will be described.

Fig. 10 is a plan view of a vehicle body floor structure 100b for explaining the operation of the vehicle body floor structure 100b of the second embodiment.

The floor structure 100b of the second embodiment is composed of side beams 1, front beams 2A, and rear beams 2B in a quadrangular shape, and the front corners of the quadrangles are obliquely combined with the side beams 1 and the front beams 2A through the first reinforcement member 41. way to strengthen. Therefore, the strength and rigidity of the corner portion can be ensured, and twisting of the side rail 1 and the front cross member 2A can be suppressed. In addition, the rear corner of the quadrangle is reinforced in such a manner that it is obliquely joined to the side rail 1 and the rear cross member 2B by the second reinforcement member 42 , and the strength and rigidity of the corner can be ensured, and the side rail 1 and the rear cross member 2B can be restrained. distortion.

As shown in FIG. 10, when a collision load F is applied due to a vehicle collision or the like from the side of the vehicle body B, as shown by a thick arrow F1, the load can be easily transmitted from the side beam 1 to the front through the first reinforcing member 41. Beam 2A. At this time, the first reinforcement member 41 is between the front beam 2A and the side beam 1, and plays a role of supporting resistance, so that the side beam 1 can be restrained from bending with the joint point C1 of it and the front beam 2A as a fulcrum. To further elaborate on this, in the absence of the first reinforcing member 41, the side beam 1 bends with the joint point C1 with the front beam 2A as the fulcrum, and the distance L1 between the action point and the joint point C1 is relatively long. That is, the bending moment acting on the front portion of the side rail 1 is large. In contrast, in the case where the first reinforcing member 41 is provided, due to the supporting force of the first reinforcing member 41, the joining point C2 of the first reinforcing member 41 and the side beam 1 becomes a fulcrum, and the distance between the fulcrum and the point of action is L2 becomes shorter. Consequently, the bending moment acting on the edge beam 1 is reduced.

Also, the collision load F from the side can be easily transmitted from the side rail 1 to the rear cross member 2B through the second reinforcement member 42 as indicated by the arrow F2. At this time, since the second reinforcing member 42 forms a smooth force transmission path between the rear beam 2B and the side beam 1, the load acting on the side beam 1 can be effectively transmitted to the rear beam 2B, so that the side beam 1 Deformation is suppressed.

In addition, as shown in FIG. 10 , although the impact load F from the side is transmitted to the floor 10 as thick two-dot chain line ripples, the same as the case described in the first embodiment, the load acting on the floor 10 It is absorbed by the concentric arc-shaped ribs 20 located at the four corners of the floor 10 and centered on the corners perpendicular to the side beams and the aforementioned cross beams. That is, since the extending direction of the reinforcing rib 20 is substantially perpendicular to the double-dot chain line corrugation, the reinforcing rib 20 can exert a supportive resistance to the load, and can suppress the deformation of the floor 10 . Further, the rib 20 transmits the collision load F from the side to the front cross member 2A and the rear cross member 2B.

As shown by the arrows F3 and F4, since the impact load F from the side passes through the first reinforcing member 41 and the second reinforcing member 42, the side beam 1 will not be bent, so it will be effectively transmitted to the front side frame 4 and the rear. side frame 5.

In this way, by adopting the first reinforcing member 41 and the second reinforcing member 42 of the second embodiment, the bending of the side beam 1 can be suppressed, and the side beam 1, the front beam 2A, and the rear beam 2B can be made into a simulated frame structure, that is, with a thick The similar structure of the plates suppresses the distortion of each part and improves the rigidity of the body B. Also, the collision load F from the side can be effectively transmitted (distributed) to the front cross member 2A and the rear cross member 2B via the first reinforcement member 41 and the second reinforcement member 42 . Accordingly, deformation of the side rails 1, the front cross member 2A, the rear cross member 2B, and the floor panel 10 constituting the vehicle body floor structure 100b can be suppressed.

The embodiments of the present invention have been described above, but the present invention is not limited to the foregoing embodiments, and appropriate changes can be made in accordance with the gist of the invention.

In the first embodiment, for example, as shown in Figure 5(a), the reinforcing rib 20 can protrude into a circular arc shape smaller than a semicircle, in addition, it can also be a quadrilateral cross section as shown in Figure 5(b), or As shown in Figure 5(c), it is a mountain-shaped (triangular) section.

In addition, as shown in FIG. 6 , it is also possible to form concentric circular arc-shaped reinforcing ribs 20 instead of providing floor beams. Also in this case, since the ribs 20 are provided in the same direction as the propagation direction of the collision load F, the ribs 20 can bear the collision load F while supporting the load, thereby suppressing deformation of the floor 10 .

In addition, in the second embodiment, for example, the rear cross member 2B is cut before reaching the side rail 1 and is joined to the side rail 1 through the second reinforcement member 42 . direct engagement.

In addition, FIG. 11( a ) and FIG. 11( b ) are enlarged perspective views showing a first reinforcement member in a modified example. In the second embodiment, the first reinforcing member 41 is formed with the inclined portion 41a, but as shown in FIG. The side rail 1 and the front cross member 2A are arranged obliquely and joined thereto. In addition, the ribs 20 on the floor 10 may also be omitted.

In addition, as shown in FIG. 11(b), instead of forming the inclined portion 41a, the first reinforcing member 44 may be formed to have a triangular upper surface portion 44a and side walls 44b, wherein the upper surface portion 44a and The corner formed by the side rail 1 and the front cross member 2A corresponds, and the side wall 44 b extends vertically downward from the upper surface portion 44 a to obliquely connect the side rail 1 and the front cross member 2A.

However, since these first reinforcement members 43, 44 protrude into the interior of the vehicle compartment relatively large, if the first reinforcement member 41 having the inclined portion 41a in the aforementioned embodiment is used, the interior space of the vehicle compartment can be increased. Fully play a strengthening role.

Claims (5)

1. car body floor structure, it has the floor, and this floor is fenced up by left and right a pair of side bar and the forward and backward pair of beams that is erected between this left and right a pair of side bar, it is characterized in that,

Be formed with reinforced rib on above-mentioned floor, this reinforced rib is that the position with aforementioned side bar and aforementioned crossbeam quadrature is the center of circle, is the concentric circles arc.

2. car body floor structure as claimed in claim 1 is characterized in that,

Form a plurality of above-mentioned reinforced ribs, and make between each reinforced rib and have identical distance.

3. car body floor structure as claimed in claim 1 is characterized in that,

By be arranged on car body central authorities and in front and back upwardly extending floor tunnel strengthen aforementioned floor.

4. car body floor structure as claimed in claim 2 is characterized in that,

By be arranged on car body central authorities and in front and back upwardly extending floor tunnel strengthen aforementioned floor.

5. as claim 1 each described car body floor structure to the claim 4, it is characterized in that,

It is fixed on floor crossmember on the above-mentioned left and right a pair of side bar end at least, strengthens above-mentioned floor by this floor crossmember.

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