JP2013082291A - Lower structure of vehicle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lower structure of a vehicle body, which can reliably transfer a load at a side impact to a cross member from a locker without inviting an increase in the number of components and weight.SOLUTION: A second floor cross 3 is provided between the locker 1 and a first floor cross 2, and a protrusion 32 and a lower bead 35 are provided on the second floor cross 3. When a vehicle causes the side impact and has the locker 1 deformed and urged to rotate on a rotating shaft, a tip of the protrusion 32 is bent, and the protrusion 32 is contracted to perform operational control. Additionally, the lift of the lower bead 35 is decreased to make the lower bead 35 start rotation; a bottom surface of the lower bead 35 abuts on the locker 1 to promote interference; and a reaction force is generated. This enables rapid formation of a state in which the load is transferred between the locker 1 and the first floor cross 2. Consequently, the side impact load can be efficiently transferred to the first floor cross 2 from the locker 1.

Description

  The present invention relates to a lower structure of a vehicle body, and more particularly to a lower structure of a vehicle body that can suitably transmit a side collision load from a rocker to a cross member at the time of a vehicle side collision.

  Generally, a rocker extending in the front-rear direction of the vehicle body is provided on the vehicle body lower side portion of the vehicle. When a side collision occurs in this vehicle, a collision load is input to the rocker, and the rocker is deformed to absorb the collision load. In addition, a cross member extending in a direction crossing the extending direction of the rocker is often provided inside the body of the rocker, and a load input to the rocker is transmitted to the cross member in a side collision. This increases the shock absorption.

  In addition, depending on the structure of the vehicle, it is often required to pass the wire harness between the front and rear of the vehicle beyond the cross member. Therefore, a vehicle body lower structure is known in which a gusset is interposed between the rocker and the cross member, and the wire harness can be passed between the front and rear directions of the vehicle through the gusset (see, for example, Patent Document 1). By inserting a gusset between the rocker and the cross member, and connecting the rocker and the cross member with the gusset, when a side collision occurs in the vehicle, the load is reliably transmitted from the side sill to the cross member. Will be able to.

JP 2010-36810 A

  However, in the above-mentioned Patent Document 1, the rocker and the cross member are connected with a gusset interposed between the rocker and the cross member. For this reason, there existed a problem of causing the increase in a number of parts and a weight. The rocker and the cross member are connected with a gusset interposed between the rocker and the cross member, but deformation of the gusset at the time of a side collision is not taken into consideration. For this reason, depending on the deformation state of the gusset, there is a problem that the load cannot be reliably transmitted from the rocker to the cross member.

  Therefore, an object of the present invention is to provide a lower structure of a vehicle body that can reliably transmit a load at the time of a side collision from a rocker to a cross member without causing an increase in the number of parts and weight.

  The lower structure of the vehicle body according to the present invention that solves the above problems is disposed on the lower side portion of the vehicle body, and extends in a direction that intersects with the rocker extending in the front-rear direction of the vehicle body, and the rocker extending direction, A connecting portion connected to the rocker and a spacing member spaced apart from the rocker, and a cross member joined to the rocker, wherein the cross member intersects the extending direction of the rocker The cross member main body extending to the cross member, and a connecting portion for connecting the cross member main body and the rocker with the spacing portion interposed therebetween, and interference that promotes interference between the cross member and the rocker when a side collision load is input. A promotion part and an operation control part which controls operation of an interference promotion part are provided.

  In the lower structure of the vehicle body according to the present invention, the cross member includes an interference promoting unit that promotes interference between the cross member and the rocker when a side collision load is input, and an operation control unit that controls the operation of the interference promoting unit. ing. For this reason, the load at the time of a side collision can be reliably transmitted from the rocker to the cross member by the interference promoting portion and the operation control portion. Further, since the interference promoting part and the operation control part are provided on the cross member, the load can be transmitted without using other parts such as a gusset. Therefore, the load at the time of a side collision can be reliably transmitted from the rocker to the cross member without causing an increase in the number of parts and weight.

  Here, the cross member is divided and includes a first cross member having a cross member main body and a second cross member having a connecting portion, and an interference promoting portion and an operation control portion are provided in the connecting portion, When a side collision load is input, the rocker and the first cross member are deformed, and the rocker and the first cross member can interfere with each other by contacting the interference promoting portion and sandwiching the interference promoting portion.

  As described above, when the side collision load is input, the rocker and the first cross member are deformed, and the rocker and the first cross member interfere with each other by contacting the interference promoting portion and sandwiching the interference promoting portion. The load can be reliably transmitted to the member.

  Further, a bent portion is formed between the joint portion of the second cross member with the rocker and the joint portion of the first cross member, and a reinforcing bead can be formed at the bent portion.

  As described above, since the reinforcing bead is formed in the bent portion, it is possible to prevent the bent portion from buckling and hindering the operation of the operation control unit. Therefore, the operation control unit operates reliably, and as a result, the load at the time of a side collision can be more reliably transmitted from the rocker to the cross member.

  Furthermore, the operation control unit can be a distance shortening unit that is formed in the coupling unit and is folded when a side collision load is input to reduce the distance of the separation unit.

  In this way, the operation control unit is a distance shortening unit that is formed in the connecting portion and is folded when a side collision load is input to reduce the distance of the separation portion. Can be transmitted more reliably.

  The cross member is divided and includes a first cross member having a cross member main body and a second cross member having a connecting portion, and an interference promoting portion and an operation control portion are provided in the connecting portion, When the impact load is input, the operation control unit deforms between the rocker and the interference promoting unit, the rocker and the first cross member deform, and the operation control unit and the interference promoting unit are sandwiched by the rocker and the first cross member. Thus, the rocker and the first cross member can interfere with each other.

  As described above, when the side collision load is input, the operation control unit and the interference promoting unit are sandwiched between the rocker and the first cross member, and the rocker and the first cross member interfere with each other, so Thus, load transmission can be suitably performed. Therefore, the load at the time of a side collision can be reliably transmitted from the rocker to the cross member.

  According to the lower structure of the vehicle body according to the present invention, the load at the time of a side collision can be reliably transmitted from the rocker to the cross member without increasing the number of parts and the weight.

It is a principal part perspective view of the lower part structure of the vehicle body which concerns on 1st Embodiment. It is a principal part front sectional view of the lower part structure of the vehicle body concerning a 1st embodiment. It is sectional drawing which shows the deformation | transformation state at the time of the side collision of the vehicle in the lower structure of the conventional vehicle body, (a) shows the state before a side collision, (b) shows the state after a side collision. It is sectional drawing which shows the deformation | transformation state at the time of the side collision of the vehicle in the lower part structure of the vehicle body of 1st Embodiment, (a) shows the state before a side collision, (b) shows the state after a side collision. . It is a principal part perspective view of the lower part structure of the vehicle body which concerns on 2nd Embodiment. It is a principal part front sectional view of the lower part structure of the vehicle body concerning a 2nd embodiment. It is sectional drawing which shows the deformation | transformation state at the time of the side collision of the vehicle in the lower part structure of the vehicle body of 2nd Embodiment, (a) shows the state before a side collision, (b) shows the state after a side collision. . It is a principal part perspective view of the lower structure of the vehicle body which concerns on 3rd Embodiment. It is a principal part front sectional view of the lower part structure of the vehicle body concerning a 3rd embodiment. It is sectional drawing which shows the deformation | transformation state at the time of the side collision of the vehicle in the lower part structure of the vehicle body of 3rd Embodiment, (a) shows the state before a side collision, (b) shows the state after a side collision. .

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. For the convenience of illustration, the dimensional ratios in the drawings do not necessarily match those described.

[First Embodiment]
FIG. 1 is a perspective view of a lower structure of a vehicle body according to the first embodiment of the present invention, and FIG. 2 is a front sectional view thereof. As shown in FIG. 1, the lower structure of the vehicle body according to the present embodiment includes a rocker 1 extending in the front-rear direction of the vehicle body. 2, the rocker 1 is disposed on the lower side of the vehicle body, and a rocker outer (not shown) extending in the front-rear direction of the vehicle body and a rocker inner 11 extending in the front-rear direction of the vehicle body are joined together. Has been formed. Moreover, the cross-sectional shape orthogonal to the extending direction of the rocker 1 is a shape in which a flange is formed on the top and bottom of a square.

  On the inner side of the rocker 1, there is provided a first floor cross 2, which is a cross member body of the present invention that extends in the direction in which the rocker 1 extends, and in the present embodiment, the direction orthogonal to the vehicle (vehicle width direction). Yes. The first floor cloth 2 is also the first cross member of the present invention. A tunnel (not shown) is provided on the opposite side of the first floor cloth 2 from the side where the rocker 1 is provided.

  Further, between the first floor cloth 2 and the rocker 1, a second floor cloth 3 which is a connecting portion of the present invention is provided. The second floor cloth 3 is also a second cross member of the present invention. In the present embodiment, the cross member is divided into a first floor cross 2 and a second floor cross 3, and the cross member has a first floor cross 2 and a second floor cross 3.

The second floor cloth 3 includes an outer side joint portion 31 joined to the rocker 1, and the outer side joint portion 31 is connected to a projecting portion 32 serving as an operation control portion and a distance shortening portion. The front sectional shape of the projecting portion 32 is a substantially triangular shape projecting upward. On the inner side of the protruding portion 32, an inner side connecting portion 33 joined to the first floor cloth 2 is formed.

  A bent portion 34 is formed in the inner side connecting portion 33, and the inner side of the bent portion 34 is joined to the first floor cloth 2 by welding. The bent portion 34 is formed between the joint portion with the rocker 1 and the joint portion with the first floor cloth 2 in the second floor cloth 3. The width of the projecting portion 32 (the length in the vehicle front-rear direction) is longer than the length of the outer side joint portion 31 and the inner side connection portion 33, and notches are formed on both sides of the projecting portion 32. .

  In addition, lower beads 35 that are interference promoting portions of the present invention are formed at two locations on the outer side of the bent portion 34 in the inner side connecting portion 33. As shown in FIG. 2, the lower bead 35 is formed in a substantially cylindrical shape, and the depth thereof is longer than the distance from the lower bead 35 to the rocker inner 11 in the rocker 1.

  Further, the two lower beads 35 are arranged side by side in the vehicle front-rear direction. The second floor cloth 3 includes an upper bead 36 that is a reinforcing bead of the present invention. The upper bead 36 has an oval shape in plan view, and its longitudinal direction is arranged along the vehicle width direction. Further, the upper bead 36 is formed across the bent portion 34.

  Moreover, in the rocker 1 side edge part in the 2nd floor cross 3, the junction part 37 is formed in the lower side, and the notch part 38 is formed in the upper side. An end surface of the joint portion 37 is in contact with an inner side surface of the rocker inner 11 in the rocker 1, and a welding piece 39 is provided so as to protrude from the side.

  The weld piece 39 faces the inner side surface of the rocker inner 11, and the weld piece 39 and the inner side surface of the rocker inner 11 are joined by welding. The second floor cloth 3 is separated from the rocker 1 at the portion where the notch 38 is formed, and a separation portion R is formed between the second floor cloth 3 and the rocker 1.

  Next, the operation of the lower structure of the vehicle body related to the present embodiment will be described. In the lower structure of the vehicle body according to the present embodiment, the first floor cloth 2 is disposed on the side of the rocker 1 via the second floor cloth 3. When a side collision load is input when a side collision occurs in the vehicle, the side collision load is transmitted to the first floor cloth 2 via the rocker 1 and the second floor cloth 3.

  Here, since the rocker 1 is disposed in the lower part of the vehicle body, when a side collision of the vehicle occurs, the rocker 1 passes through the center in the height direction and extends along the direction extending to the rocker 1 (hereinafter referred to as the rocker 1). It rotates in the direction that the upper part falls inward around the "rotary axis". There is a concern that this rotation may prevent transmission of a side load from the rocker 1 to the first floor cloth 2.

  For example, FIG. 3A shows a cross-sectional view of a conventional vehicle lower structure. In the lower structure of the conventional vehicle body, the configuration of the second floor cloth 30 is different from that of the present embodiment, and the second floor cloth 3 of the present embodiment shown in FIGS. 1 and 2 is different from the conventional second floor. The cross 30 has the following differences.

  The second floor cloth 30 shown in FIG. 3A is common to the second floor cloth 3 of the present embodiment in that an outer side joint portion 31 and an inner side connection portion 33 are provided. On the other hand, the second floor cloth 3 according to this embodiment is not provided with the protrusion 32, the lower bead 35, and the upper bead 36 in the second floor cloth 3 according to this embodiment shown in FIGS. Is different.

  In the conventional second floor cloth 30, when the side collision occurs in the vehicle due to the absence of the protruding portion and the upper and lower beads, the rocker 1 rotates around the rotation axis as shown in FIG. Fall down toward the inner side. As the rocker 1 falls, the bent portion 34 of the second floor cloth 30 bends and rises. As a result, the upper part of the rocker 1 cannot make good contact with the first floor cloth 2 and it takes time until the upper part of the rocker 1 comes into contact with the first floor cloth 2. As a result, the side impact load transmitted to the first floor cloth 2 is reduced.

  In this regard, the second floor cloth 3 in the lower structure of the vehicle body related to the present embodiment is provided with a protruding portion 32, a lower bead 35, and an upper bead 36 as shown in FIG. For this reason, when a side collision occurs in the vehicle and the rocker 1 is deformed and tries to rotate around the rotation axis, the tip of the projecting portion 32 is bent and the projecting portion 32 is contracted to control the operation.

  Further, although a load is also input to the bent portion 34, since the upper bead 36 is formed, the floating of the lower bead 35 is reduced and the lower bead 35 starts to rotate. By rotating the lower bead 35, as shown in FIG. 4B, the bottom surface of the lower bead 35 comes into contact with the rocker 1 to promote interference, and a reaction force is generated. Thus, the lower bead 35 is sandwiched between the rocker 1 and the first floor cloth 2 and a reaction force is generated, thereby quickly forming a state in which a load is transmitted between the rocker 1 and the first floor cloth 2. Can do. As a result, a side impact load can be efficiently transmitted from the rocker 1 to the first floor cloth 2.

  Further, in the first floor cloth 2 according to the present embodiment, a separation portion R is formed at an upper portion at a position where the rocker 1 is joined. By forming the separation portion R, a wire harness or the like can be easily wired from the front to the rear of the vehicle. In addition, by providing the second floor cloth 3 in the separation portion R, the side collision load can be reliably transmitted from the rocker 1 to the first floor cloth 2.

  Furthermore, in the lower structure of the vehicle body according to the present embodiment, the protruding portion 32 that performs operation control and the lower bead 35 that promotes interference are both provided on the second floor cloth 3. For this reason, it is not necessary to provide another member such as a gusset between the rocker 1 and the floor cloth. Therefore, the load at the time of a side collision can be reliably transmitted from the rocker to the cross member without causing an increase in the number of parts and weight.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 5 is a perspective view of a lower structure of a vehicle body according to the second embodiment of the present invention, and FIG. 6 is a front sectional view thereof. As shown in FIGS. 5 and 6, the lower structure of the vehicle body according to the present embodiment includes the same rocker 1 as that of the first embodiment.

  A first floor cloth 2 similar to that of the first embodiment is provided on the inner side of the rocker 1. On the other hand, a second floor cloth 4 different from that of the first embodiment is disposed in the separation portion R between the first floor cloth 2 and the rocker 1. The second floor cloth 4 in the present embodiment includes an outer side joint portion 41 joined to the rocker 1. The outer side of the outer side joint portion 41 is joined to the rocker 1 by welding. In addition, a refracting portion 42 serving as an operation control portion is formed on the inner side of the outer side joint portion 41.

  The refracting portion 42 is formed such that the outer side joining portion 41 extends to the inner side, descends as it goes from the outer side to the inner side, and rises as it goes to the inner side after exceeding the refraction point. I am doing. Thus, the refracting portion 42 is configured to have a refracting point protruding downward.

  An inner side connection portion 43 is formed on the inner side of the refracting portion 42. Similar to the inner side connection portion 33 according to the first embodiment, the inner side connection portion 43 according to the present embodiment is formed with a bent portion 44, and the inner side of the bent portion 44 is closer to the first floor cloth 2. And are joined by welding.

  In addition, beads 45 are formed at two locations on the outer side of the bent portion 44 in the inner side connection portion 43. As shown in FIG. 5, the bead 45 is formed in a substantially cylindrical shape, and the depth thereof is longer than the distance from the bead 45 to the rocker inner 11 in the rocker 1. These two lower beads 45 are arranged side by side in the vehicle longitudinal direction.

  Next, the operation of the lower structure of the vehicle body related to the present embodiment will be described. In the lower structure of the vehicle body according to the present embodiment, the first floor cloth 2 is disposed on the side of the rocker 1 via the second floor cloth 4. When a side collision load is input when a side collision occurs in the vehicle, the side collision load is transmitted to the first floor cloth 2 via the rocker 1 and the second floor cloth 4.

  Here, since the rocker 1 is arranged at the lower part of the vehicle body, when a side collision of the vehicle occurs as in the first embodiment, the rocker 1 falls in the direction in which the upper side falls over the rotation axis. Rotate. There is a concern that this rotation may prevent transmission of a side load from the rocker 1 to the first floor cloth 2.

  In this regard, the second floor cloth 4 in the lower structure of the vehicle body related to the present embodiment is provided with a refracting portion 42 and a bead 45 as shown in FIG. For this reason, when a side collision occurs in the vehicle and the rocker 1 is deformed and tries to rotate around the rotation axis, the refracting portion 42 bends with its tip as a base point.

  When the refracting part 42 is bent, the first floor cloth 2 moves to the outer side, and the refracting part 42 and the bead 45 are sandwiched between the rocker 1 and the first floor cloth 2. When the refracting portion 42 and the bead 45 are sandwiched, a reaction force is generated on the rocker 1 as shown in FIG. In this way, when the refraction part 42 and the bead 45 are sandwiched between the rocker 1 and the first floor cloth 2 and a reaction force is generated, a load is transmitted between the rocker 1 and the first floor cloth 2. Can be formed quickly. As a result, a side impact load can be efficiently transmitted from the rocker 1 to the first floor cloth 2.

  Further, in the first floor cloth 2 according to the present embodiment, a separation portion R is formed at an upper portion at a position where the rocker 1 is joined. By forming the separation portion R, a wire harness or the like can be easily wired from the front to the rear of the vehicle. In addition, since the second floor cloth 4 is provided in the separation portion R, the side impact load can be reliably transmitted from the rocker 1 to the first floor cloth 2.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. FIG. 8 is a perspective view of a lower structure of a vehicle body related to the second embodiment of the present invention, and FIG. 9 is a front sectional view thereof. As shown in FIGS. 8 and 9, the lower structure of the vehicle body according to the present embodiment includes the same rocker 1 as that of the first embodiment.

  A first floor cloth 2 similar to that of the first embodiment is provided on the inner side of the rocker 1. Further, a connecting member 5 different from that of the first embodiment is provided in the separation portion R between the first floor cloth 2 and the rocker 1. The connecting member 5 includes an outer side joint 51 that is joined to the rocker 1. The outer side of the outer side joint portion 51 is joined to the rocker 1 by welding.

  Further, a recess 52 is provided on the inner side of the outer side joint 51. The depression 52 has a U-shaped front cross-sectional shape, and the opening is arranged facing upward. The outer side joint portion 51 is attached to the outer side piece in the hollow portion 52. The width of the recess 52 along the vehicle front-rear direction is smaller than the width of the first floor cross 2 in the vehicle front-rear direction.

  Further, an inner side connection portion 53 is provided on the inner side piece of the recess portion 52. The inner side connection part 53 is a plate-like member, and the hollow part 52 is connected to the side on the outer side, while the first floor cloth 2 is connected to the side on the inner side. The width of the inner side connection portion 53 in the vehicle front-rear direction is substantially the same as the width of the outer side joint portion 51 in the vehicle front-rear direction. The outer side joint portion 51, the hollow portion 52, and the inner side connection portion 53 are formed integrally with the first floor cloth 2.

  Next, the operation of the lower structure of the vehicle body related to the present embodiment will be described. In the lower structure of the vehicle body according to the present embodiment, a first floor cloth 2 is disposed on the side of the rocker 1 via a connecting member 5. When a side collision load is input when a side collision occurs in the vehicle, the side collision load is transmitted to the first floor cloth 2 via the rocker 1 and the connecting member 5.

  Here, since the rocker 1 is arranged at the lower part of the vehicle body, when a side collision of the vehicle occurs as in the first embodiment, the rocker 1 falls in the direction in which the upper side falls over the rotation axis. Rotate. There is a concern that this rotation may prevent transmission of a side load from the rocker 1 to the first floor cloth 2.

  In this regard, in the connecting member 5 that connects the rocker 1 and the first floor cloth 2 in the lower structure of the vehicle body according to the present embodiment, as shown in FIG. For this reason, when a side collision occurs in the vehicle and the rocker 1 moves to the inner side, the recess 52 in the connecting member 5 is interposed between the rocker 1 and the first floor cloth 2.

  When the recess 52 in the connecting member 5 is interposed between the rocker 1 and the first floor cloth 2, a reaction force is generated on the rocker 1 as shown in FIG. Thus, a recess 52 is interposed between the rocker 1 and the first floor cloth 2 and a reaction force is generated, so that a state in which a load is transmitted between the rocker 1 and the first floor cloth 2 is quickly formed. can do. As a result, a side impact load can be efficiently transmitted from the rocker 1 to the first floor cloth 2.

  Further, in the first floor cloth 2 according to the present embodiment, a separation portion R is formed at an upper portion at a position where the rocker 1 is joined. By forming the separation portion R, a wire harness or the like can be easily wired from the front to the rear of the vehicle. Moreover, since the connecting member 5 is provided in the separation portion R, the side impact load can be reliably transmitted from the rocker 1 to the first floor cloth 2.

  DESCRIPTION OF SYMBOLS 1 ... Rocker, 2-4 ... Floor cross, 5 ... Connecting member, 11 ... Rocker inner, 31, 41, 51 ... Outer side junction part, 32 ... Projection part, 33, 43, 53 ... Inner side connection part, 34, 44 DESCRIPTION OF SYMBOLS ... Bending part, 35 ... Lower bead, 36 ... Upper bead, 37 ... Joint part, 38 ... Notch part, 39 ... Weld piece, 42 ... Refraction part, 45 ... Bead, R ... Separation part.

Claims (5)

A rocker disposed on the lower side of the vehicle body and extending in the front-rear direction of the vehicle body;
A cross member that extends in a direction crossing the extending direction of the rocker, is connected to the rocker, and is formed to be spaced apart from the rocker and is joined to the rocker And comprising
The cross member has a cross member main body extending in a direction intersecting with the extending direction of the rocker, and a connecting portion connecting the cross member main body and the rocker with the spacing portion interposed therebetween. ,
An interference promoting portion that promotes interference between the cross member and the rocker when a side collision load is input;
An operation control unit for controlling the operation of the interference promoting unit;
A lower structure of a vehicle body characterized by comprising: The cross member is divided, and includes a first cross member having the cross member main body and a second cross member having the connecting portion,
The interference promoting part and the operation control part are provided in the connecting part,
The rocker and the first cross member are deformed when a side collision load is input, and the rocker and the first cross member interfere with each other by sandwiching the interference promoting portion by contacting the interference promoting portion. The lower structure of the vehicle body described. A bent portion is formed between the joint portion with the rocker and the joint portion with the first cross member in the second cross member,
The lower structure of the vehicle body according to claim 2, wherein a reinforcing bead is formed in the bent portion.   The said operation control part is a distance shortening part which is formed in the said connection part, is folded at the time of a side collision load input, and shortens the distance of the said separation | spacing part. The undercarriage of the car body. The cross member is divided, and includes a first cross member having the cross member main body and a second cross member having the connecting portion,
The interference promoting part and the operation control part are provided in the connecting part,
When the side collision load is input, the operation control unit is deformed between the rocker and the interference promoting unit, and the rocker and the first cross member are deformed,
The lower structure of the vehicle body according to claim 1, wherein the rocker and the first cross member interfere with each other by sandwiching the operation control unit and the interference promoting unit between the rocker and the first cross member.

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