JP2000001184A - Vehicle body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the body structure of the car with high safety permitting control of the amount of deformation of the floor and sufficient control of the invasion of center pillar or the like when the impact load is applied from the side of the vehicle. SOLUTION: In this vehicle body structure, a side sill 10 is coupled to a side edge of a floor 30 with a closed section shape that extends along the longitudinal direction of the body. This structure also comprises a cross member 40 which extends with a predetermined height in the vehicle width direction on the floor 30 that generally corresponds in the longitudinal direction of the body to the center pillar that is provided so that it stands. The cross member also forms the close section shape with the floor 30 in the vehicle width direction. An outer end portion 46 of the cross member 40 is arranged oppositely with a predetermined interval in a side sill inner 11 of the side sill 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure, and more particularly to a vehicle body structure near a lower portion of a center pillar.

[0002]

2. Description of the Related Art A vehicle body structure near a lower portion of a center pillar of an automobile is disclosed in, for example, Japanese Utility Model Laid-Open No. 5-54167, FIG.
FIG. 9 is a perspective view of a main part of the lower part of the center pillar viewed from the vehicle interior side, and FIG. 9 is a sectional view taken along line IV-IV of FIG.
Side sill 110 extending in the front-rear direction along the side of the vehicle body formed by
A center pillar 120 having a closed cross-sectional shape extending in the up-down direction is erected by a center pillar inner 121 and a center pillar outer 122 upward from 10, and a side end of the floor 131 is joined to the side sill inner 111.

A cross member 132 extending in the vehicle width direction is provided on the upper surface of the floor 131 so as to substantially correspond to the lower end of the center pillar 120 in the vehicle longitudinal direction.
31 and a front seat (not shown) is supported on the upper surface of the cross member 132.

The outer end of the cross member 132 is connected to the side sill inner 111 and the cross member 1
32 between the side sill inner 111 and the floor 131
The bracket 133 extending from the upper side of the side sill inner 111 to the upper side of the side sill is connected and firmly connected to the side sill 110, the floor 131 and the cross member 132, so that an impact load acting from the vehicle body side is applied via the cross member 132. In some cases, the side sill 110 is prevented from being deformed by being received by the floor 131 and the tunnel portion 135.

FIG. 10 is a sectional view of a main part corresponding to FIG.
As shown in the figure, the cross-sectional shape near the outer end of the cross member 131 is enlarged, and the outer end of the cross member 132 is connected to the side sill inner 111 over a wide range from the floor 131 to the vicinity of the upper end of the side sill inner 111.
In some cases, the strength of connection between the floor sill 10 and the floor 131 is ensured to prevent deformation of the side sill 110 against an impact load acting from the side of the vehicle body.

[0006] A seat bracket 115 is provided between a side sill 110 and a floor 131 disposed on the side of the vehicle body as shown in FIG. Seat bracket 116 bridged between section 135 and floor 131
The seat cushion 140 is supported by the two seat brackets 115 and 116, and the reinforcing member 145 is provided on the seat cushion 140 so as to be close to the wall of the seat brackets 115 and 116 so as to be opposed to each other. In some cases, an impact load of a predetermined value or more is received by the tunnel portion 135 via the seat brackets 115 and 116 and the reinforcing member 145 to prevent the side sill 110 from being deformed.

[0007]

SUMMARY OF THE INVENTION
According to Japanese Patent Publication No. 67 and the vehicle body structure shown in FIGS. 8 and 9, the impact load applied from the vehicle body side is transmitted to the floor and the tunnel portion via the cross member and received, so that the deformation of the side sill is suppressed. Similar effects can be obtained in the vehicle body structure shown in FIG.

On the other hand, according to JP-A-3-112791, the impact load from the side of the vehicle body is received by the tunnel portion via the seat bracket and the reinforcing member, so that the deformation of the side sill can be suppressed.

However, according to these vehicle body structures, the side sill is firmly fixed and supported from the inside of the vehicle by the cross member or the seat bracket, and the impact load is received by the tunnel portion. When acting, there is a concern that the floor, cross member, etc., buckle and deform at a substantially intermediate portion between the side sill and the tunnel portion, so that the penetration amount of the center pillar or the side door into the vehicle interior increases.

Accordingly, an object of the present invention in view of the above point is that when an impact load of a predetermined value or more is applied from the side of the vehicle body, the amount of deformation of the floor and the cross member is suppressed and the vehicle interior such as a center pillar is provided. It is an object of the present invention to provide a highly safe vehicle body structure capable of sufficiently suppressing intrusion into a vehicle.

[0011]

According to a first aspect of the present invention, a side sill having a closed cross section extending along the longitudinal direction of a vehicle body is connected to a side end of a floor. A cross member extending at a predetermined height in the vehicle width direction on the floor substantially corresponding to the center pillar erected in the side sill in the vehicle front-rear direction in the vehicle width direction and forming a closed cross-sectional shape in the vehicle width direction together with the floor; And a fragile portion near the side sill that allows the side sill to tilt by a predetermined amount due to an impact load applied to the side surface of the vehicle body from a side of the vehicle body.

According to the first aspect of the present invention, the vehicle body is provided with a fragile portion near the side sill that allows the side sill to tilt by a predetermined amount due to an impact load acting on the side surface of the vehicle body from the side of the vehicle body. The impact load of a predetermined value or more acting on the side surface is reduced by tilting and deforming the side sill and the center pillar erected on the side sill by a predetermined amount, and the reduced impact load acts on the cross member. Buckling deformation is suppressed, and the amount of side sills, center pillars, side doors and the like entering the vehicle interior is greatly reduced, and safety is ensured.

According to a second aspect of the present invention, there is provided a vehicle body structure for a vehicle, wherein a side pillar having a closed cross section extending along the longitudinal direction of the vehicle body is connected to a side end of the floor, and a center pillar erected on the side sill. In the vehicle body structure of a vehicle having a cross member that extends at a predetermined height in the vehicle width direction on the floor substantially corresponding to the vehicle body front-rear direction and forms a closed cross-sectional shape in the vehicle width direction together with the floor, A fragile portion is provided near the side of the vehicle body to allow a predetermined amount of tilting of the side sill by bending and deforming the vicinity of the side sill due to an impact load acting on the side surface of the vehicle body from the side of the vehicle body.

According to the second aspect of the present invention, when an impact load of a predetermined value or more acts on the side of the vehicle body from the side of the vehicle body, the fragile portion bends and deforms the vicinity of the side sill of the floor to allow a predetermined amount of tilting of the side sill. As a result, the impact load reduced by tilting and deforming the side sill and the center pillar erected on the side sill by a predetermined amount acts on the cross member, and the buckling deformation of the cross member and the floor occurs. As a result, the amount of intrusion of the side sill, center pillar, side door, and the like is greatly reduced, and safety is ensured.

According to a third aspect of the present invention, there is provided a vehicle body structure according to the present invention, wherein a side sill having a closed cross section extending along the longitudinal direction of the vehicle body is connected to a side end of the floor, and a center pillar and a vehicle body erected on the side sill. In a vehicle body structure provided with a cross member extending at a predetermined height in the vehicle width direction on the floor substantially corresponding to the front-rear direction and forming a closed cross-sectional shape in the vehicle width direction together with the floor, An outer end portion faces the inner side surface of the side sill with a predetermined gap.

According to the third aspect of the present invention, the outer end of the cross member is opposed to the inner side surface of the side sill with a predetermined gap, whereby a predetermined value or more acting on the side sill, center pillar, side door or the like from the side is obtained. After the side sill abuts against the outer edge of the cross member, the impact load on the cross member is greatly reduced, and the impact load on the cross member and the floor is reduced. Buckling deformation is suppressed, and the amount of penetration of side sills, center pillars, side doors and the like is greatly reduced, and safety is ensured.

According to a fourth aspect of the present invention, there is provided a vehicle body structure for a vehicle, wherein a side sill having a closed cross section extending along the longitudinal direction of the vehicle body is connected to a side end of the floor, and a center pillar erected on the side sill is provided. A vehicle body structure comprising: a cross member extending at a predetermined height in the vehicle width direction on the floor substantially corresponding to the vehicle body front-rear direction and forming a closed cross-sectional shape in the vehicle width direction together with the floor. Has an outer end portion coupled to the inner side surface of the side sill, and a fragile portion which is buckled and deformed by a predetermined amount due to an impact load acting on the side surface of the vehicle body from the side of the vehicle body from the side of the vehicle body near the side sill. It is characterized.

According to the fourth aspect of the present invention, the outer end of the cross member is connected to the inner surface of the side sill, and a fragile portion is provided near the side sill of the cross member and buckled by an impact load of a predetermined value or more by a predetermined amount. The impact load of a predetermined value or more acting on the side sill, center pillar, side door, etc. from the side is reduced by tilting of the side sill and cross member near the side rail of the cross member and deformation of the center pillar due to buckling deformation of the fragile portion. The reduced impact load acts on the portion of the cross member other than the vicinity of the side sill, buckling deformation of the portion of the cross member except the side sill and the floor is suppressed, and the penetration amount of the side sill, center pillar, side door, etc. is reduced. It is greatly reduced and safety is ensured.

According to a fifth aspect of the present invention, in the vehicle body structure of the fourth aspect, the fragile portion is a shape suddenly changing portion which is formed on an upper surface of the cross member and changes its shape rapidly. And

According to the fifth aspect of the present invention, it is possible to easily form a fragile portion by forming a sharply changing portion in which the shape changes suddenly so that stress is concentrated by an impact load on the upper end of the cross member. .

According to a sixth aspect of the present invention, in the vehicle body structure of the fifth aspect, the abrupt shape change portion extends on the upper surface of the cross member along the vehicle longitudinal direction.

According to the sixth aspect of the present invention, the suddenly changing shape is extended on the upper surface of the cross member in the longitudinal direction of the vehicle body, so that the suddenly changing shape is continuously formed, so that the side sill can be surely tilted.

According to a seventh aspect of the present invention, there is provided a vehicle body structure for a vehicle, wherein a side sill having a closed cross section extending along the longitudinal direction of the vehicle body is connected to a side end of the floor, and a center pillar erected on the side sill is provided. A vehicle body structure comprising: a cross member extending at a predetermined height in the vehicle width direction on the floor substantially corresponding to the vehicle body front-rear direction and forming a closed cross-sectional shape in the vehicle width direction together with the floor. A plurality of cross members having an outer end coupled to the inner side surface of the side sill and extending on the floor at a predetermined height in the vehicle width direction to form a closed cross-sectional shape in the vehicle width direction together with the floor. At least one of the cross member portions includes a fragile portion near the side sill that buckles and deforms by a predetermined amount due to an impact load applied to the side surface of the vehicle body from the side of the vehicle body. Characterized in that was.

According to the seventh aspect, since a plurality of cross members are provided, in addition to the effect of the fourth aspect, an effective living space is secured by reducing the height of the cross member protruding into the vehicle interior. It improves the livability.

According to an eighth aspect of the present invention, in the vehicle body structure of the seventh aspect, the plurality of cross members are provided with the fragile portions near the side sills, and the fragile portions substantially correspond to each other in the vehicle width direction. It is formed at the position.

According to the eighth aspect of the present invention, the side sill can be stably tilted by making the fragile portions formed in the respective cross members substantially correspond in the vehicle width direction.

According to a ninth aspect of the present invention, in the vehicle body structure of the seventh or eighth aspect, the fragile portion is
It is a shape suddenly changing portion formed on the upper surface of the cross member portion and changing its shape rapidly.

According to the ninth aspect of the present invention, the fragile portion can be easily formed by being formed on the upper surface of the cross member portion and rapidly changing in shape.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a first embodiment of a vehicle body structure according to the present invention.
This will be described with reference to FIGS.

FIG. 1 is a perspective view of a main part of the lower part of the center pillar viewed from the vehicle interior side, and FIG. 2 is a cross-sectional view taken along line II of FIG. ing.

In the figure, reference numeral 10 denotes a side sill, which is a side sill inner 11 and a side sill out 1 opposed to each other.
2 is formed in a closed cross-sectional shape extending in the vehicle longitudinal direction.

The center pillar 2 having a closed cross section and extending in the vertical direction formed by the center pillar inner 21 and the center pillar outer 22 from the side sill 10 upward.
0, the upper end of the center pillar 20 is connected to a roof (not shown), and the lower ends of the center pillar inner 21 and the center pillar outer 22 are connected to the side sill inner 11.
The side sill 10 and the center pillar 20 are firmly connected to the lower end of the side sill outer 12 integrally.

The side end of the floor 30 is joined to a relatively lower portion of the side sill inner 11 of the side sill 10,
A tunnel portion 35 extending in the front-rear direction of the vehicle body is formed at a central portion of the vehicle body width direction.

On the upper surface of the floor 30 substantially corresponding to the lower end of the center pillar 20 in the longitudinal direction of the vehicle, a cross member 40 having a hat-shaped cross section is provided extending in the vehicle width direction.
The floor 30 and the cross member 40 form a closed cross-sectional shape extending in the vehicle body width direction, thereby reinforcing the floor 30 mainly by restraining deformation in the vehicle body width direction.

Further, a frame side 48 having a hat-shaped cross section is provided on the lower surface of the floor 30 at an intermediate portion between the side sill 10 and the tunnel portion 35, and extends in the vehicle longitudinal direction.
The floor 30 and the frame side 48 form a closed cross-sectional shape extending in the vehicle longitudinal direction, and the floor 30 is reinforced by mainly restraining deformation in the vehicle longitudinal direction.

The cross member 40 has an inner end 41 opposed to the tunnel portion 35 with a predetermined gap, and
1 and a low top portion 42 having a relatively small height h from the floor 30 to the top surface 43, and a high top portion 44 formed smoothly and continuously from the low top portion 42 and having a relatively large height H from the floor 30 to the top surface 45. And a sheet (not shown) is attached to the upper surface 45 of the high top portion 44.

An outer end 46 continuously formed at the high top 44 of the cross member 40 faces the side sill inner 11 with a predetermined gap a, and the end 46a is
0 and a predetermined amount of tilting of the side sill 10 due to an impact load F from the side that is equal to or greater than a predetermined value due to a gap a between the outer end 45 of the cross member 40 and the side sill inner 11 serving as the inner surface of the side sill. Is formed.

In the vehicle body structure thus configured,
Side of vehicle body, for example, side sill 10, center pillar 20
Alternatively, when an impact load F of a predetermined value or more acts on a side door (not shown) or the like from the side, the side sill 1
A substantially entire width between the zero and the tunnel portion 35 is reinforced by the cross member 40 extending in the vehicle width direction, and a gap a is formed between the outer end 45 of the cross member 40 and the side sill inner 11. Then, the side sill inner 11 of the side sill 10 abuts on the outer end 46 of the cross member 40 by inclining the connecting portion 30a to the vicinity of the connecting portion 30a connected to the side end of the floor 30 toward the vehicle cabin centering on the swinging center. The tilting of the side sill 10 and the center pillar 20 connected to the side sill 10 is restricted, and the inner end 41 of the cross member 40 abuts on the tunnel portion 35 to be received.

Accordingly, the impact load F acting on the side sill 10, the center pillar 20 or the side door from the side is obtained.
Is reduced by the inclination of the side sill 10 and the deformation of the center pillar 20 erected between the side sill 10 and the roof, and then the side sill 10 comes into contact with the outer end 45 of the cross member 40. The load is greatly reduced, the buckling deformation of the cross member 40 and the floor 30 is suppressed, and the amount of intrusion of the side sill 10, the center pillar 20, the side door, etc. into the vehicle interior is greatly reduced, and safety is secured. Is done.

The deformation of the center pillar 20 due to the impact load F from the side will be described. As shown in FIG. 3 (a), the center is connected to the side rail 10 fixed by a cross member or the like as in the above-mentioned conventional case. In the pillar 20, the position of the portion M where the maximum value of the bending moment m occurs is relatively high as indicated by the dashed line m, and the height of the vicinity of the chest of the occupant sitting on the seat is shown by the dashed line m. Is the center pillar 20
There is a possibility that a relatively high position of the vehicle may enter the vehicle interior.

On the other hand, when the side sill 20 is tilted by an impact load F equal to or more than a predetermined value as in the present embodiment shown in FIG. 3B, it is generated on the center pillar 20 having a lower end fixed to the side sill 20. As shown by the one-dot chain line m, the position of the portion M where the maximum value of the bending moment m occurs is relatively low, and is located at a height near the seat cushion of the seat, and the buckling deformation of the floor 30 is suppressed. Together with this, safety is further ensured.

(Second Embodiment) FIGS. 4 and 5 show a second embodiment of the vehicle body structure according to the present invention.
It will be explained by.

FIG. 4 is a perspective view of the essential part of the lower part of the center pillar viewed from the vehicle interior side, and FIG.
In the sectional view taken along the line, the same reference numerals are given to the portions corresponding to FIGS. 1 and 2 for convenience of description, and the detailed description of the corresponding portions will be omitted.

A side end of the floor 30 is connected to a relatively lower portion of the side sill inner 11, and a cross member extending in the vehicle width direction, for example, having a substantially hat-shaped cross section, is provided on the upper surface of the floor 30 substantially corresponding to the lower end of the center pillar 20. 50 are provided,
The floor 30 and the cross member 50 form a closed cross-sectional shape extending in the vehicle width direction to reinforce the floor 30.

The cross member 50 has an inner end 51 facing the tunnel portion 35 with a predetermined gap, and
1 and the height h of the upper surface 53 from the floor 30 is relatively small, and the height H of the upper surface 55 from the floor 30 is formed continuously from the floor 30 via a step 57.
Has a relatively large high peak 54, and a sheet is attached to the upper surface 55 of the high peak 54.

The cross member 50 at the end of the high top 54
The outer end 56 of the side sill inner 1 extends from the upper surface of the floor 30 to the vicinity of a relatively upper end of the side sill inner 12.
2 are connected.

Further, the side sill 10 of the cross member 50
Near, for example, the upper surface 53 of the low top 52 of the cross member 50
In other words, between the upper surface 53 and the stepped portion 57, between the upper surface 53 and the stepped portion 57, a shape suddenly changing portion 58 whose shape changes rapidly between the upper surface 53 and the stepped portion 57 along the vehicle longitudinal direction is continuously formed. The shape suddenly changing portion 58 buckles and deforms due to stress concentration around the shape suddenly changing portion 58 and the shape suddenly changing portion 58 due to an impact load F that is equal to or more than a predetermined value from the side.
A fragile portion A that allows a predetermined amount of tilt of 0 is formed.

In the vehicle body structure configured as described above,
As in the first embodiment, when an impact load F of a predetermined value or more acts on the side of the vehicle body such as the side sill 10, the center pillar 20, or the side door (not shown), the floor 30 is connected to the side sill 10. A low top portion 5 of the cross member 50 in which substantially the entire width between the tunnel portions 35 extends in the vehicle width direction.
3, the suddenly changing shape 58 is formed at a position near the side sill 10 of the cross member 50, so that the stress load concentrates on the suddenly changing shape 58, and the portion is buckled and deformed. Connecting part 30 connected to the side end of
a to the connecting portion 30a are tilted around the center of swing, and the high top portion 54 that is connected to the side sill 10 and tilts together with the side sill 10 is pressed against the low top portion 52 and received by the low top portion 52, and connected to the side sill 10 and the side sill 10. The tilted center pillar 20 is restricted, and the inner end 51 of the cross member 50 contacts the tunnel portion 35 and is received.

Therefore, an impact load F applied to the side sill 10, the center pillar 20 or the side door from a predetermined value or more inclines the high top 54 of the side sill 10 and the cross member 50 and the center erected on the side sill 10. After being reduced by the deformation of the pillar 20, it is received by the low top 53 of the cross member 50, so that the impact load on the low top 52 of the cross member 50 is greatly reduced, and the low top 52 of the cross member 50 and the floor 30 are reduced. Of the side sill 10, the center pillar 20, the side door, and the like are greatly reduced, and the side sill 2 is formed similarly to the first embodiment.
By tilting 0, the portion where the maximum value of the bending moment generated in the center pillar 20 occurs is relatively low, and the buckling position of the center pillar 20 is low, thereby ensuring safety. You.

Further, since the outer end portion 56 of the cross member 50 is connected to the side sill inner 12 over a wide range from the upper surface of the floor 30 to the vicinity of the relatively upper end of the side sill inner 12, the side sill 20 and the cross member 50 in a normal state are provided. Is obtained, and the rigidity of the vehicle body is secured as compared with the first embodiment.

It is to be noted that the shape suddenly changing portion 58 constituting the fragile portion A
Can be deformed into another arbitrary shape such as a concave shape continuous in the vehicle longitudinal direction as shown by a wavy line 58a in FIG.

(Third Embodiment) Next, a third embodiment of the vehicle body structure according to the present invention will be described with reference to FIGS.
It will be explained by.

FIG. 6 is a perspective view of the essential part of the lower part of the center pillar viewed from the vehicle interior side, and FIG.
In the sectional view taken along the line II, parts corresponding to those in FIGS. 1 to 5 are denoted by the same reference numerals for convenience of description, and detailed description of the corresponding parts is omitted.

A side end of the floor 30 is connected to a relatively lower portion of the side sill inner 11 of the side sill 10, and a cross member 60 extending in the vehicle width direction is provided on the upper surface of the floor 30 substantially corresponding to the lower end of the center pillar 20. Have been.

The cross member 60 has a plurality of, in this embodiment, three, extending cross-sectional shapes extending in the vehicle width direction by the floor 30 and the cross member 60. The first, second, and third cross members 61, 71, and 78 are provided depending on the provided waveform shape, and the height of the cross member 60 is set lower than the height of the cross member 50 of the second embodiment. As a result, the height of the cross member protruding into the vehicle interior is suppressed to improve the livability.

The first cross member portion 61 has an inner end 62 facing the tunnel portion 35 with a predetermined gap, a low top portion 63 formed continuously with the inner end 62 and having a relatively low upper surface 64, and a low top portion 63. And a high top portion 65 which is formed continuously through a step portion 68 and has a relatively large upper surface 66 from the floor 30. A sheet is attached to the upper surface 66 of the high top portion 65.

The outer end 67, which is the end of the high peak 65,
The side sill inner 12 is joined to the side sill inner 12 from the upper surface of the floor 30 to the vicinity of a relatively upper end of the side sill inner 12.

Further, the vicinity of the side sill 20 of the first cross member portion 61, for example, the outer end of the upper surface 64 of the low apex 63,
In other words, between the upper surface 64 and the stepped portion 68, a shape suddenly changing portion 69 is formed continuously along the vehicle body front-rear direction and has a concave shape in cross section, and the shape is suddenly changed.
Thereby forming a fragile portion Aa.

The second cross member portion 71 is disposed substantially parallel to the first cross member portion 61. The inner end 72 faces the tunnel portion 35 with a predetermined gap, and is formed continuously with the inner end 62 to form a relatively low upper surface. Low top 73 with 74
The outer end 75 of the low top portion 73 is connected to the side sill inner 12 from the upper surface of the floor 30 to the vicinity of a relatively upper end of the side sill inner 12, and the outer end 67 of the first cross member portion 61. Is formed continuously.

Further, in the vicinity of the side sill 20 on the upper surface 74, the shape changes abruptly in the vehicle longitudinal direction at a position substantially corresponding to the shape suddenly changing portion 69 formed in the first cross member portion 61 in the vehicle width direction. A suddenly changing shape portion 76 is formed,
The brittle portion Ab is formed by the sudden shape change portion 76.

The third cross member portion 78 is disposed substantially parallel to the first cross member portion 61 and the second cross member 72 between the first cross member portion 61 and the second cross member portion 71, and is connected to the side sill inner 11. A closed cross-sectional shape that is continuous in the vehicle width direction over the floor 30 is formed.

In the vehicle body structure thus configured,
As in the first and second embodiments, the side sill 1
0, when an impact load F of a predetermined value or more acts on the side of the vehicle body such as the center pillar 20 or the side door from the side, the floor 30 extends substantially the entire width between the side sill 10 and the tunnel portion 35 in the vehicle width direction. The low top portion 63 of the first cross member portion 61 of the existing cross member 70 and the second cross member portion 7
The shape-changing portions 69 and 76 are reinforced by the first and third cross member portions 78 and located at positions near the side sills 10 of the first cross member portion 61 and the second cross member portion 71.
Is formed, stress loads are concentrated on the suddenly changing portions 69 and 76, and the portions are buckled and deformed, and tilt around the side end of the floor 30 around the swing center, and are joined to the side sill 10 to form the side sill. The high top 65 tilting with the 10 is the low top 63
To the side sill 10 and the center pillar 20, and the inner ends 62 and 72 of the first cross member 61 and the third cross member 71 are connected to the tunnel 35. It is accepted by contact.

Therefore, the impact load F applied to the side sill 10, the center pillar 20 or the side door from a predetermined value or more is reduced by the inclination of the side sill 10 and the deformation of the center pillar 20 near the side end of the cross member 70 and the side end. After that, the impact load applied to the cross member 70 is significantly reduced, and the buckling deformation of the floor 30 reinforced by the cross member 70 is suppressed, and the side sill 10 and the center pillar 20 are received. , The amount of intrusion of the side doors and the like is greatly reduced, and as in the first and second embodiments, the part of the maximum bending moment generated in the center pillar 20 by tilting the side sill 20 is reduced. This is relatively low and the buckling position of the center pillar 20 is low. Occupant safety is secured.

Further, since the cross member 70 is formed by the first, second, and third cross member portions 61, 71, and 78, the height of the cross member 60 can be reduced according to each of the first and second embodiments. It can be set smaller than the cross member, and by suppressing the height of the cross member protruding into the vehicle interior, an effective living space in the vehicle interior is secured and the livability is improved.

In the present embodiment, the third cross member 78 has no fragile portion, but the third cross member 78 also has the first cross member 61 and the second cross member 61.
It is also possible to form a fragile portion formed by a shape suddenly changing portion whose shape suddenly changes at a portion substantially corresponding to the shape suddenly changing portions 69 and 76 of the cross member portion 71 in the vehicle width direction. First and third cross member portions 61,
Although 71 and 78 are provided, other cross member members may be formed as required, and the present invention is not limited to the first to third embodiments and does not depart from the spirit of the invention. Various changes can be made within the range.

[0066]

According to the vehicle body structure of the present invention described above, a fragile portion is provided in the vicinity of the side sill to allow the side sill to tilt by a predetermined amount due to an impact load of a predetermined value or more acting on the side of the vehicle body from the side of the vehicle. As a result, the impact load of a predetermined value or more acting on the side surface of the vehicle body is reduced by tilting and deforming the side sill and the center pillar erected on the side sill by a predetermined amount, and the reduced impact load acts on the cross member. Therefore, the buckling deformation of the cross member and the floor is suppressed, the amount of intrusion of the side sill, the center pillar, the side door, and the like is greatly reduced, and safety is secured, which greatly contributes to vehicle safety.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a vehicle body structure according to a first embodiment of the present invention, which is a main part perspective view of a main part viewed from a vehicle interior side.

FIG. 2 is a sectional view taken along line II of FIG. 1;

FIG. 3 is a diagram illustrating the operation of the first embodiment.

FIG. 4 is a perspective view showing a main part of a vehicle body structure according to a second embodiment of the present invention, which is a main part perspective view when the main part is viewed from the vehicle interior side.

FIG. 5 is a sectional view taken along line II-II of FIG. 1;

FIG. 6 is a perspective view showing a main part of a vehicle body structure according to a third embodiment of the present invention, which is a main part perspective view when the main part is viewed from the vehicle interior side.

FIG. 7 is a sectional view taken along line III-III of FIG. 1;

FIG. 8 is a perspective view of a main part for explaining a body structure of a conventional automobile.

FIG. 9 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 10 is a cross-sectional view of a main part for explaining a vehicle body structure of a conventional automobile.

FIG. 11 is a cross-sectional view of a main part for explaining a body structure of a conventional automobile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Side sill 11 Side sill inner 12 Side sill out 20 Center pillar 30 Floor 35 Tunnel part 40 Cross member 43 Top surface 45 Top surface 46 Outside end 50 Cross member 53 Top surface 55 Top surface 56 Outside end 58 Shape sudden change part 60 Cross member 61 First cross member Part 64 upper surface 66 upper surface 67 outer end portion 69 shape suddenly changing portion 71 second cross member portion 74 upper surface 75 outer end portion 76 shape suddenly changing portion 78 third cross member portion a predetermined gap A fragile portion

Claims (9)

[Claims] 1. A side sill having a closed cross section extending along the longitudinal direction of the vehicle body is coupled to a side end of the floor, and a vehicle is mounted on the floor substantially corresponding to a center pillar erected on the side sill in the longitudinal direction of the vehicle body. In a vehicle body structure having a cross member extending at a predetermined height in a width direction and forming a closed cross-sectional shape in a vehicle width direction together with a floor, a predetermined force acting on a side surface of the vehicle body from the side of the vehicle body near the side sill. A vehicle body structure comprising a fragile portion that allows a side sill to tilt by a predetermined amount due to an impact load greater than or equal to a value. 2. A side sill having a closed cross section extending along the longitudinal direction of the vehicle body is coupled to a side end of the floor, and a vehicle is mounted on the floor substantially corresponding to a center pillar erected on the side sill in the longitudinal direction of the vehicle body. In a vehicle body structure having a cross member extending at a predetermined height in a width direction and forming a closed cross-sectional shape in a vehicle width direction together with a floor, a predetermined force acting on a side surface of the vehicle body from the side of the vehicle body near the side sill. A vehicle body structure comprising a fragile portion that allows a predetermined amount of tilting of the side sill by bending and deforming a portion near the side sill of the floor due to an impact load greater than or equal to the value. 3. A side sill having a closed cross section extending along the longitudinal direction of the vehicle body is connected to a side end of the floor, and a vehicle is mounted on the floor substantially corresponding to a center pillar erected on the side sill in the longitudinal direction of the vehicle body. In a vehicle body structure provided with a cross member extending at a predetermined height in a width direction and forming a closed cross-sectional shape in a vehicle width direction together with a floor, an outer end of the cross member is provided on an inner surface of the side sill. A vehicle body structure of an automobile, wherein the vehicle body structure faces each other with a predetermined gap. 4. A side sill having a closed cross section extending along the longitudinal direction of the vehicle body is connected to a side end of the floor, and a vehicle is mounted on the floor substantially corresponding to a center pillar erected on the side sill in the longitudinal direction of the vehicle body. In a vehicle body structure provided with a cross member extending at a predetermined height in a width direction and forming a closed cross-sectional shape in a vehicle width direction together with a floor, an outer end of the cross member has an inner surface of a side sill. And a fragile portion which is buckled and deformed by a predetermined amount or more by an impact load acting on the side surface of the vehicle body from the side of the vehicle body from the side of the vehicle body in the vicinity of the side sill. 5. The vehicle body structure according to claim 4, wherein the fragile portion is a shape suddenly changing portion formed on an upper surface of the cross member and having a sudden change in shape. 6. The vehicle body structure according to claim 5, wherein the suddenly changing shape portion extends on the upper surface of the cross member along the vehicle front-rear direction. 7. A side sill having a closed cross section extending along the longitudinal direction of the vehicle body is coupled to a side end of the floor, and a vehicle is mounted on the floor substantially corresponding to a center pillar erected on the side sill in the longitudinal direction of the vehicle body. In a vehicle body structure provided with a cross member extending at a predetermined height in a width direction and forming a closed cross-sectional shape in a vehicle width direction together with a floor, an outer end of the cross member is provided on an inner surface of the side sill. A plurality of cross member portions that are coupled and extend on the floor at a predetermined height in the vehicle width direction and form a closed cross-sectional shape in the vehicle width direction together with the floor, and at least one of the cross member portions is provided. A vehicle body structure for an automobile, comprising: a fragile portion that buckles and deforms by a predetermined amount due to an impact load acting on the side surface of the vehicle body from the side of the vehicle body from the side of the vehicle body. 8. The vehicle according to claim 7, wherein the weak portions are provided near the side sills of the plurality of cross members, and the weak portions are formed at substantially corresponding positions in the vehicle width direction. Body structure. 9. The vehicle body structure according to claim 7, wherein the fragile portion is a shape suddenly changing portion formed on an upper surface of the cross member portion and changing its shape rapidly.