JP6861112B2 - Rocker structure of automobile - Google Patents

Description

The present invention relates to a rocker portion structure of an automobile provided on the lower edge of a side surface of a vehicle floor.

Conventionally, in order to improve the ease of getting on and off from the side door of an automobile, the height position of the closed cross section of the side sill (also referred to as rocker) provided at the lower edge of the side door opening is lowered to reduce the amount of foot lift. (See, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

Further, in the vehicle body structure disclosed in Patent Document 1 and the floor structure disclosed in Patent Document 2, the side sill is provided at an inclined portion provided at an intermediate position in the vehicle body front-rear direction and on the vehicle body rear side of the inclined portion. Floor cross members are connected. As a result, the floor cross member reinforces the side sill.

Further, in the vehicle body side structure disclosed in Patent Document 3, the side sill is provided at the lower end of the center pillar and extends in the front-rear direction of the vehicle body, and the vehicle body front side of the center pillar has a closed cross-sectional height from the vehicle body rear side. The position is formed low. As a result, the center pillar reinforces the side sill.

Japanese Patent No. 3763146 Japanese Unexamined Patent Publication No. 2000-318654 Japanese Patent No. 3736214

However, in the vehicle body structure of the automobile of Patent Document 1, since the closed cross-sectional height position of the side sill is aligned with the cross-sectional height position of the floor cross member arranged below the front seat, the side sill is referred to as the floor cross member. Since it is necessary to sharply lower the joint portion toward the front, when collision energy is received from the front of the vehicle body, there is a risk that stress will be significantly concentrated on the inflection points formed on both ends of the slope. It was.

Further, in the floor structure of Patent Document 2, the floor cross member is connected on the front side of the inflection point formed on the rear end side of the slope formed on the side sill and is formed on the rear end side of the slope. Since it is connected to the position of the inflection point, when the collision energy is received from the front of the vehicle body, there is a possibility that the stress is remarkably concentrated on the inflection point formed on each end side of the slope.

Further, in the vehicle body side structure of the automobile of Patent Document 3, since the closed cross-sectional height position of the side sill is lowered between the center pillar and the floor cross member located in front of the vehicle body, collision energy is received from the front of the vehicle body. At that time, there was a risk that stress would be remarkably concentrated on the connection portion of the side sill with the center pillar on the front side of the vehicle body.

In this way, in each structure, due to stress concentration on the side sill, there is a risk of breaking at the part where the stress is concentrated, and the body rigidity is reduced, resulting in deterioration of ride comfort and NV level (comfort regarding noise and vibration felt by the driver). There was concern that the sexual index) would decline.

In order to prevent such stress concentration on the side sill, it is conceivable to increase the plate thickness of the members constituting the side sill, but since it causes an increase in the weight of the entire vehicle, this measure has a drawback of deteriorating fuel efficiency. there were.

The present invention has been made to solve such a conventional difficulty, and even if the height position of the closed cross section of only the portion provided at the lower edge of the side door opening at one location of the rocker portion is lowered, the height position of the closed cross section may be lowered. It is an object of the present invention to provide a rocker portion structure of an automobile capable of reducing the weight of the rocker portion without lowering the collision safety performance and body rigidity.

The rocker portion structure of an automobile, which is the first aspect of the present invention that achieves the above-mentioned object, is formed in a hollow closed cross-sectional structure by a rocker outer lean force and a rocker inner lean force, and is formed on a lower side edge of a vehicle floor. It is related to the provided rocker section.
The closed cross-sectional height position of the portion of the rocker portion arranged at the front side door opening or the lower edge of the rear side door opening is set lower than the closed cross-sectional height position of the other portion of the rocker portion, and the rocker is provided. At the intermediate position of the portion, a gradual change section in which the height position of the closed cross section gradually changes based on the difference in the height position is provided.
The inflection points formed on both ends of the slow-changing section together with the slow-changing section of the rocker portion are joined to the B-pillar so as to fit within the vehicle front-rear width direction of the B-pillar extending in the vertical direction of the vehicle. Is what you are doing. In addition, in this specification, "extension" means that it extends so as to extend in one direction.
In the part where the closed cross-section height position of the rocker part is low, a share panel for suppressing deformation of the low part of the rocker part is placed in front of and behind the vehicle between the joint side of the rocker outer lean force and the rocker inner lean force. It is sandwiched in the direction. In addition, in this specification, "sandwiching" means wearing in a sandwiched state.
At least some of the Rocker Outer Lean Forces and Rocka Inner Lean Forces are ultra-high-strength steel plates with a tensile strength of 1180 MPa, or higher, and have a tensile strength that allows the shape of each Rockaline Force to be press-formed. It is made of high-strength steel plate.

According to the rocker portion structure of the automobile according to the first aspect as described above, first, the tensile strength is applied to at least a part of the materials of the rocker outer lean force and the rocker inner lean force, which are the main cross-sectional components. Uses an ultra-high-strength steel plate of 1180 MPa or higher, and an ultra-high-strength steel plate with a tensile strength that allows the shape of each rockerin forcement to be press-formed. Even if the strength is thinner than the thickness of a high-strength steel plate having a strength of 590 MPa or less, it is possible to lower the closed cross-sectional height position of the rocker portion arranged at the lower edge of the front side door opening or the rear side door opening. ..
As a result, the amount of foot lift between the ground and the floor inside the vehicle can be reduced, and in particular, when getting off from the floor inside the vehicle to the ground, the step on the floor inside the vehicle can be eliminated, so that the foot can be easily pulled out from the side door opening. Further, even if the tensile strength is thinner than the thickness of the high-tensile steel plate having a tensile strength of 590 MPa or less, which has been conventionally used for the rocker portion, the closed cross-sectional height position of the front side door opening or the rear side door opening of the rocker portion can be set. Since it can be lowered, the rocker portion can obtain the required bending strength (cross-sectional strength) without increasing the weight.

Secondly, in the part where the closed cross-sectional height position of the rocker part is low, the share panel is arranged in the front-rear direction of the vehicle between the joint side between the rocker outer lean force and the rocker inner lean force, so that the front and rear of the vehicle Bending of the rocker part of the vector can be suppressed, and since the share panel can be arranged along the vertical direction of the vehicle, bending (cross-section collapse) due to bending deformation of the rocker part of the vehicle vertical vector can be suppressed. Even if the height position of the closed cross section of the rocker portion is lowered at the position of the rear side door opening, the decrease in body rigidity can be prevented. That is, the rocker outer lean force and the rocker inner lean force are formed of the above-mentioned ultra-high-strength steel plate even if the share panel is sandwiched only in the portion where the closed cross-sectional height position of the rocker portion is low. Therefore, the cross-sectional yield strength of the entire rocker portion can be obtained.

Thirdly, the inflection points formed on both ends of the slow-changing section together with the slow-changing section of the rocker portion are included in the front-rear width direction of the B-pillar extending in the vertical direction of the vehicle. Since it is joined to the pillars, when it receives collision energy from the front or rear of the vehicle, it stresses the inflection points formed on both ends of the slowly changing section of the rocker portion due to the strength and rigidity of the B pillars. Can be prevented from concentrating.

The second aspect of the present invention is the inner surface including the bent portion at the ridgeline of the upper portion of the rocker inner lean force at the portion where the closed cross-sectional height position of the rocker portion is low in the rocker portion structure of the automobile according to the first aspect. In the above, a reinforcing member for suppressing deformation of the low portion of the rocky inner lean force is reinforced in a shoulder patch shape in the front-rear direction of the vehicle.

According to the rocker portion structure of the automobile as described in the second aspect, when the collision energy is received from the front or the rear of the vehicle, the stress is likely to be concentrated in the portion where the closed cross-sectional height position of the rocker portion is low. Since the reinforcing member is reinforced in the shape of a shoulder patch in the front-rear direction of the vehicle with respect to the inner energy, it is possible to reinforce the ridge line strength along the front-rear direction of the vehicle at this portion.

The third aspect of the present invention is the rocker portion structure of the automobile according to the first aspect or the second aspect. The rocker outer lean force and the rocker inner lean force are divided into two in the front-rear direction of the vehicle, and each of the front sides is divided into two. Each rockerine force is formed to include the intermediate position in the vehicle front-rear direction of the part where the closed cross-sectional height position of the rocker part is low , and each rockerine force is an ultra-high-strength steel plate with a tensile strength of 1180 MPa or more. The shape of the ment is made of an ultra-high-strength steel plate with a tensile strength that can be press-formed , and each rockerine force on the rear side is made of a high-tensile steel plate with a tensile strength of 590 MPa or less. ..

According to the rocker portion structure of the automobile as described in the third aspect, each rocker reinforcement on the rear side is formed into a shape that can be joined to the rear pillar portion of the cymen outer or the wheel house, which is formed into a complicated three-dimensional shape. Can be formed.

According to the rocker portion structure of the automobile of the present invention, in order to improve the ease of getting on and off from the side door of the automobile, the closed cross-sectional height of only the portion provided at the lower edge of the side door opening at one location of the rocker portion Even if the position is lowered, the weight of the rocker portion can be reduced without lowering the collision safety performance and the body rigidity.

It is a figure which shows the preferable embodiment in the rocker part structure of the automobile of this invention, (A) is the side view which excluded the rocker inner lean force of the rocker part and the member related thereto, (B) is the rocker of the rocker part. A side view excluding the outer lean force and related members, (C) is a view in which the AA line cross sections of (A) and (B) are overlapped. In the explanatory view of the rocker portion shown in FIG. 1, (A) is a side view showing the relationship with the cymen outer, and (B) is a cross-sectional view showing the relationship with the cymen outer and the floor panel. It is an exploded view which shows each member of the rocker part shown in FIG. It is sectional drawing which shows the deformation operation state of the part where the closed cross-sectional height position of the rocker part shown in FIG. 1 is low.

Hereinafter, a mode example for carrying out the rocker portion structure of the automobile of the present invention will be described with reference to the drawings. Since the rocker portion structure of the automobile of the present invention has the same left and right structure in the vehicle width direction, FIGS. 1 to 3 show only one direction side in the vehicle width direction, and this one direction side will be described. Further, in each drawing used in the embodiment for carrying out the present invention, the direction is indicated by an arrow, which indicates the direction seen from the occupant seated in the driver's seat. The arrow UPR indicates the vehicle upward direction, the arrow FR indicates the vehicle front direction, and the arrow LH indicates the vehicle left direction.

The rocker portion to which the rocker portion structure of the automobile of the present invention is applied is provided on the lower edge of the side surface of the vehicle floor in the front-rear direction of the vehicle, and is one of the strength members constituting the side opening of the vehicle. As shown in FIGS. 2A and 2B, for example, the rocker portion is a body body of a 4-door vehicle or a 5-door vehicle having a hinged door (not shown) that rotates horizontally to open and close. It is arranged at the lower edge of the front side door opening 81 and the rear side door opening 82 of the side outer panel (hereinafter, referred to as “Symen outer”) 8 constituting the side surface of the vehicle, and the front part of the vehicle is the front pillar lower (not shown). ), And the rear part of the vehicle is joined to the cymen outer 8 and the wheel house (not shown). Further, in the rocker portion 1, the outer side portion of the vehicle is joined to the simen outer 8 and the bottom portion of the vehicle is joined to the floor panel 9.

The cymen outer 8 referred to here has a front pillar lower portion 84 on the front side of the vehicle, a rear pillar portion 85 on the rear side of the vehicle, and a B pillar (center pillar) between the front and rear of the vehicle with respect to the rocker portion 83 for joining to the rocker portion 1. ) Sites 86 are formed respectively.

The rocker structure of the automobile of the present invention adopted for such a 4-door vehicle or a 5-door vehicle is shown in FIGS. 1 (A), (B), (C), 2 (A), (B), and 3. As shown in the above, the rocker outer lean force 2, the rocker inner lean force 3, the share panel 4, the first reinforcing member 5, and the second reinforcing member 6 are provided. The rocker portion 1 is formed into a hollow closed cross-sectional structure by joining the rocker outer lean force 2 arranged in the outer direction of the vehicle and the rocker inner lean force 3 arranged in the inner direction of the vehicle. ..

For example, the rocker outer forcement 2 is formed so that the shape seen from the rear side of the vehicle in the longitudinal direction (axial direction) of the rocker outer forcement 2 is a substantially hat shape having an opening facing the inside of the vehicle. The rocker inner lean force 3 is formed so that the shape seen from the rear side of the vehicle in the longitudinal direction (axial direction) of the rocker inner forcement 3 is a substantially hat shape in cross section in which the opening faces the outer direction of the vehicle. Has been done. That is, the rocker outer lean force 2 and the rocker inner lean force 3 are arranged so that their opening sides face each other.

Further, at the joints at both ends in the closed cross section formed by joining the rocker outer lean force 2 and the rocker inner lean force 3, the rocker outer force 2 and the rocker are joined along the longitudinal direction of the rocker portion 1. Flange 2a, 2b, 3a, 3b are extended to each of the inner lean force 3, and one flange 2a on the upper side of the rocker outer lean force 2 and one flange 3a on the upper side of the rocker inner forcement 3 are extended. By joining the other flange 2b, which is the lower side of the rocker outer lean forcement 2, and the other flange 3b, which is the lower side of the rocker inner lean forcement 3, both ends of the rocker portion 1 are joined. Flange portions 11a and 11b are extended to the joint portion.

Further, the height position of the closed cross section of the portion 12 of the rocker portion 1 arranged at the lower edge of the rear side door opening 82 of the cymen outer 8 is the rocker portion 1 arranged at the lower edge of the front side door opening 81 of the cymen outer 8. It is provided lower than the closed cross-sectional height position of the portion 13. Further, a gradual change section 14 is provided at the intermediate position of the rocker portion 1 in which the height position of the closed cross section gradually changes based on the difference in the height position.

At the portion 12 where the closed cross-sectional height position of the rocker portion 1 is low, deformation of the low portion 12 of the rocker portion 1 is suppressed between the coupling sides of the rocker outer lean force 2 and the rocker inner lean force 3. The share panel 4 for this purpose is sandwiched in the front-rear direction of the vehicle. That is, the share panel 4 is joined between one flange 2a whose upper side is the upper side of the rocker outer forcement 2 and one flange 3a whose upper side is the upper side of the rocker inner forcement 3, and the lower side is the rocker outer force. It will be joined between the other flange 2b, which is the lower side of the lean forcement 2, and the other flange 3b, which is the lower side of the rocker inner lean forcement 3.

Since such a share panel 4 can be sandwiched between the flange portion 11a which is the upper joint portion of the rocker portion 1 and the flange portion 11b which is the lower joint portion, it is installed vertically, that is, in the vehicle vertical direction. It becomes possible to arrange them along the line.

Further, the inflection points 14a and 14b formed on both end sides of the slowly changing section 14 together with the slowly changing section 14 of the rocker portion 1 are within the vehicle front-rear width direction of the B pillar 7 extending in the vertical direction of the vehicle. It is joined to the B pillar 7 so as to fit. The B-pillar 7 is formed into a hollow closed cross-sectional structure by joining the B-pillar outer lean force 71 arranged in the vehicle outer direction and the B-pillar inner lean force 72 arranged in the vehicle inner direction. Has been done. Therefore, the rocker outer lean force 2 is joined to the B pillar outer lean force 71, and the rocker inner lean force 3 is joined to the B pillar inner lean force 72.

The rocker outer lean force 2 and the rocker inner lean force 3, which are the components of the rocker portion 1, have an ultra-high-strength steel plate having a tensile strength of 1180 MPa or more, and have the shape of each rockerine force. It is composed of an ultra-high-strength steel plate with a tensile strength that can be press-formed.

When the rocker outer forcement 2 and the rocker inner forcement 3 are each formed in a substantially hat shape in cross section, the cross-sectional area of the rocker portion 1 is required to secure the required rigidity and strength. It is formed so that the size of the cross-sectional shape is substantially the same. Therefore, the size of the cross-sectional shape of the rocker outer lean force 2 and the rocker inner lean force 3 is not exactly the same as long as the rocker portion 1 has a cross-sectional area that secures the required rigidity and strength. May be good.

Further, on the inner surface including the bent portion 3c at the ridgeline of the upper portion of the rocker inner lean force 3 in the portion 12 where the closed cross-sectional height position of the rocker portion 1 is low, the lower portion 12 of the rocker inner lean force 3 is provided. The first reinforcing member 5 for suppressing the deformation of the vehicle is reinforced in a shoulder patch shape in the front-rear direction of the vehicle. The first reinforcing member 5 is the same steel plate as each rockerine force, and is joined to the rocker inner forcement 3.

Further, on the inner surface of the rocker outer forcement 2 at the portion 12 where the height position of the closed cross section of the rocker portion 1 is low, a second reinforcement formed in a substantially hat shape in cross section having a size to fit there. The member 6 is fixed in the front-rear direction of the vehicle. The second reinforcing member 6 is the same steel plate as the rocker outer forcement 2, and is joined to the rocker outer forcement 2.

Further, the rocker outer lean force 2 and the rocker inner lean force 3 of the rocker portion 1 may be divided into two in the front-rear direction of the vehicle. In this case, each of the rocker reinforcements 21 and 31 on the front side is formed to include an intermediate position in the vehicle front-rear direction of the portion 12 having a low closed cross-sectional height position of the rocker portion 1, respectively. Each rockerine force 21 and 31 on the front side is composed of an ultra-high-strength steel plate having a tensile strength of 1180 MPa, or an ultra-high-strength steel plate having a tensile strength capable of press-forming the shape of each rockerine forcement. The rear rockerine forces 22 and 32 are made of high-strength steel plates having a tensile strength of 590 MPa or less.

For example, spot welding or laser welding is adopted for joining the members in the rocker portion structure of the automobile of the present invention.

According to the rocker portion structure of the automobile of the present invention configured as described above, the following actions and effects can be obtained.

First, the materials of the rocker outer forcement 2 and the rocker inner forcement 3, which are the main cross-sectional components, are made of an ultra-high-strength steel plate having a tensile strength of 1180 MPa, or higher, and each rockerine force 2. Since an ultra-high-strength steel plate having a tensile strength capable of press-molding the shape of 3 is used, the tensile strength used in the rocker portion 1 is made thinner than that of a high-tensile steel plate having a tensile strength of 590 MPa or less. Also, the height position of the closed cross section of the rocker portion 1 arranged at the lower edge of the rear side door opening 82 of the cymen outer 8 can be lowered.

As a result, it is possible to reduce the amount of foot lift between the ground and the floor inside the vehicle at the rear side door, and in particular, when getting off from the floor inside the vehicle to the ground, it is possible to eliminate the step on the floor inside the vehicle. It will be easier. Further, even if the tensile strength conventionally used for the rocker portion 1 is thinner than the plate thickness of a high-strength steel plate of 590 MPa or less, the height position of the closed cross section of the rear side door opening of the rocker portion 1 can be lowered. Therefore, the rocker portion 1 can obtain the required bending strength (cross-sectional strength) without increasing the weight.

Secondly, in the portion 12 where the closed cross-sectional height position of the rocker portion 1 is low, a share panel is arranged in the front-rear direction of the vehicle between the joint side between the rocker outer lean force 2 and the rocker inner lean force 3. Therefore, bending of the rocker part of the vehicle front-rear vector can be suppressed, and since the share panel can be arranged along the vehicle vertical direction, bending (cross-section collapse) due to bending deformation of the rocker part of the vehicle vertical vector can be suppressed. Therefore, even if the height position of the closed cross section of the rocker portion 1 is lowered at the position of the rear side door opening, it is possible to prevent a decrease in body rigidity. That is, the rocker outer lean force 2 and the rocker inner lean force 3 are formed of the above-mentioned ultra-high-strength steel plate so that the share panel is sandwiched only in the portion where the closed cross-sectional height position of the rocker portion is low. Therefore, the cross-sectional yield strength of the entire rocker portion can be obtained.

The reason why the share panel 4 is used in this way is that when the closed cross-section height position of the rocker portion 1 is lowered at the rear side door opening without using the share panel 4, the closed cross-section height position of the rocker portion 1 is higher than that of the portion where the closed cross-section height position is high. This is because the strength and rigidity are reduced.

Further, such a share panel 4 is effective when it is made as a share surface as much as possible in order to suppress the bending of the rocker portion 1 of the vehicle front-rear vector and the cross-sectional collapse of the rocker portion of the vehicle vertical vector.

Third, the inflection points 14a and 14b formed on both ends of the slow-changing section 14 together with the slow-changing section 14 of the rocker portion 1 are in the vehicle front-rear width direction of the B pillar 7 extending in the vehicle vertical direction. Since it is joined to the B-pillar 7 so as to fit inside, when collision energy is received from the front or the rear of the vehicle, both ends of the inflection point 14 of the rocker portion 1 are affected by the strength and rigidity of the B-pillar 7. It is possible to prevent stress from being concentrated on the inflection points 14a and 14b formed in.

As described above, in the rocker portion structure of the automobile of the present invention, even if the closed cross-sectional height position of only the portion provided at the lower edge of the rear side door opening of the rocker portion 1 is lowered, the collision safety performance and the body rigidity are lowered. Therefore, it is possible to prevent deterioration of riding comfort and decrease of NV level.

Further, the rocker outer lean force 2 and the rocker inner lean force 3 are each formed in a substantially hat shape in cross section, and the cross section height is gradually changed as slowly as possible within the vehicle front-rear width of the B pillar 7. For example, the Rocker Outer Lean Force 2 and the Rocker Outer Lean Force 2 are made of an ultra-high-strength steel plate with a tensile strength of 1180 MPa, or an ultra-high-strength steel plate with a tensile strength that can press-form the shape of each rockerine forcement. Press molding is also possible in the rocker inner lean forcement 3, and the size of the cross-sectional shape is substantially large in the portion having a cross-sectional area that secures the rigidity strength required for the rocker portion 1 of the lean forcement. Since it is formed so as to be the same as the above, the strength and rigidity of the entire rocker portion can be improved.

Further, when the collision energy is received from the front or the rear of the vehicle, the first reinforcing member 5 with respect to the rocker inner lean force 3 in which the stress is easily concentrated in the portion 12 where the closed cross-sectional height position of the rocker portion 1 is low. If is reinforced in the shape of a shoulder patch in the front-rear direction of the vehicle, the ridge line strength along the front-rear direction of the vehicle at this portion can be reinforced. It should be noted that the reason why stress tends to concentrate on the rocker inner lean force 3 of the portion 12 where the closed cross-sectional height position of the rocker portion 1 is low is that the rocker inner lean force 3 is joined to the front pillar lower and the wheel house. Because it has been done.

Further, in addition to the first reinforcing member 5, a second reinforcing member 6 as described above is mounted on the inner surface of the rocker outer lean force 2 at the portion 12 where the closed cross-sectional height position of the rocker portion 1 is low. If it is fixed in the direction, the rocker outer forcement 2 at this portion can be reinforced, so that the strength and rigidity of the portion 12 having a low closed cross-sectional height position of the rocker portion 1 can be improved. ..

Further, by forming the first reinforcing member 5 with the same steel plate as each rocker reinforcement, the value of the total cross-sectional plastic moment of the rocker portion 1 at the portion 12 where the closed cross-sectional height position of the rocker portion 1 is low is increased. be able to. Therefore, the collision safety performance can be ensured even if the rocker portion 1 is reduced in weight.

In addition, the rocker outer forcement 2 and the rocker inner forcement 3 are each divided into two in the front-rear direction of the vehicle, and the front side rocker-in forcees 21 and 31 have the height positions of the closed cross sections of the rocker portion 1, respectively. The lower part 12 is formed including the intermediate position in the vehicle front-rear direction, and the rear rocker reinforcements 22 and 32 are made of high-tensile steel plates having a tensile strength of 590 MPa or less, so that each rocker on the rear side is formed. The lean forces 22 and 32 can be formed into a shape that can be joined to the rear pillar portion 85 or the wheel house of the simen outer 8 which is formed into a complicated three-dimensional shape, respectively.

In the above-described embodiment, in the rocker portion structure of the automobile of the present invention, the portion 12 having a low closed cross-sectional height position of the rocker portion 1 is arranged at the lower edge of the rear side door opening 82 of the cymen outer 8. Not limited to this, it may be arranged at the lower edge of the front side door opening 81 of the cymen outer 8. That is, the share panel, the first reinforcing member, and the second reinforcing member are placed at a portion where the height position of the closed cross section of the rocker portion arranged at the lower edge of the front side door opening 81 of the cymen outer 8 is low, as described above. By providing the rocker portion, which is arranged at the lower edge of the rear side door opening 82 of the cymen outer 8, the same operation and effect as that of a portion having a low closed cross-sectional height position can be obtained. Therefore, it can also be used in a two-door vehicle or a three-door vehicle in which there is only one side door on each side of the vehicle.

Next, the displacement analysis of the rocker portion to which the rocker portion structure of the automobile of the present invention was applied was performed. As the analysis device, a personal computer in which a structural analysis solver, which is a general-purpose analysis program by the FEM (finite element method), was installed was used. The automobile frame used for the analysis is a 4-door sedan system. The displacement analysis of the rocker portion was performed by setting the torsional rigidity analysis load of the vehicle to a predetermined value.

The analysis result is shown in FIG. 4, which is a diagram before the solid line portion is twisted and after the alternate long and short dash line portion is twisted. That is, as shown in the left figure, the rocker portion 1 to which the rocker portion structure of the automobile of the present invention is applied has the share panel 4, and therefore is slightly deformed upward, but the vehicle vertical vector. It was found that the cross-sectional collapse of the rocker part of the rocker can be suppressed. On the other hand, as shown in the figure on the right, the rocker portion 1 that does not have the share panel 4 is deformed more upward than the rocker portion structure of the automobile of the present invention. It was found that the collapse of the cross section of the car could not be suppressed.

Although the present invention has been described with reference to the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are exhibited. It goes without saying that any configuration can be adopted.

1 …… Rocker part 12 …… A part where the height position of the closed cross section is low 14 …… Slow change section 14a, 14b …… Inflection point 2 …… Rocker outer forcement 21 …… Rocker outer forcement 22 on the front side … Rear Rocka Inner Lean Force 3 …… Rocker Inner Lean Force 31 …… Front Rocker Inner Lean Force 32 …… Rear Rocker Inner Lean Force 3c …… Bending part at the ridgeline of the upper part 4… … Share panel 5 …… First reinforcing member (shoulder patch)
7 …… B-pillar 71 …… B-pillar outer lean force 72 …… B-pillar inner lean force 8 …… Saimen outer 81 …… Front side door opening 82 …… Rear side door opening 83 …… Rocker part 84 …… Front pillar lower part 85 …… Rear pillar part

Claims (3)

In the rocker section of an automobile, which is formed in a hollow closed cross-section structure by the rocker outer lean force and the rocker inner lean force, and is provided on the lower edge of the side surface of the vehicle floor.
The closed cross-sectional height position of the portion of the rocker portion arranged at the front side door opening or the lower edge of the rear side door opening is set lower than the closed cross-sectional height position of the other portion of the rocker portion, and the said At the intermediate position of the rocker portion, a gradual change section in which the height position of the closed cross section gradually changes based on the difference in the height position is provided.
The inflection points formed on both ends of the slow-changing section together with the slow-changing section of the rocker portion are placed on the B-pillar so as to be within the vehicle front-rear width direction of the B-pillar extending in the vertical direction of the vehicle. Joined,
In the portion of the rocker portion where the height position of the closed cross section is low, a share for suppressing deformation of the low portion of the rocker portion between the coupling side of the rocker outer lean force and the rocker inner lean force. The panel is sandwiched in the front-rear direction of the vehicle,
The rocker outer lean force and the rocker inner lean force are at least a part of an ultra-high-strength steel plate having a tensile strength of 1180 MPa, or higher, and have a tensile strength capable of press-forming the shape of each rockerine force. The rocker structure of an automobile, which is characterized by being composed of ultra-high-strength steel plate. Deformation of the low portion of the rocker inner lean force is suppressed on the inner surface including the bent portion at the ridgeline of the upper portion of the rocker inner lean force at the portion where the height position of the closed cross section of the rocker portion is low. The rocker portion structure of an automobile according to claim 1, wherein the reinforcing member for the purpose is reinforced in a shoulder patch shape in the front-rear direction of the vehicle. The rocker outer force and the rocker inner force are each divided into two in the front-rear direction of the vehicle.
Each rocker reinforcement of the front side, a portion serving as the closed section height position lower portion of each of said rocker portions, toward the vehicle front-rear direction is extended to an intermediate position, a tensile strength of 1180MPa ultrahigh It is composed of an ultra-high-strength steel plate with a tensile strength that allows the shape of each rockerine force to be press-formed with a high-strength steel plate or higher.
Each rockerine force on the rear side shall be composed of a high-strength steel plate with a tensile strength of 590 MPa or less .
The rocker portion structure of the automobile according to claim 1 or 2, wherein the automobile has a rocker portion structure.

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