JP2010208395A - Vehicle body bottom part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body bottom part structure capable of dispersing a side collision load of a vehicle by transferring the load from a cross member to the vehicle body while relieving the load, and capable of regulating the intrusion amount of a pillar into a vehicle interior to a predetermined extent. <P>SOLUTION: When the side collision load is input into the center pillar 4, the upper half part of a locker 1 is tilted inside the vehicle body like dotted lines so as to relieve the side collision load. At that time, the upper half part of the locker 1 is tilted to the extent at a predetermined angle β until the upper half part of a side wall part of a locker inner 1B abuts with a tilt receiving surface 5C of a cross member upper 5A. Thus, the intrusion amount of the center pillar 4 into the car interior is regulated to the predetermined extent according to the tilting angle β. Then, the locker 1 presses the cross member 5 in an axial direction so that the relieved side collision load is transmitted and dispersed from the cross member 5 to the vehicle body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle body lower side structure, and more particularly to a vehicle body lower side structure in which an end portion of a cross member is coupled to a rocker to which a lower end portion of a pillar is coupled.

  As a vehicle body lower side structure, a structure in which a rocker (side sill) having a hollow cross section extending in the front-rear direction is provided on the lower side of the vehicle body, and a lower end portion of the center pillar is coupled to the center part of the rocker in the front-rear direction is generally used. Are known.

  In this type of vehicle body structure, for example, Patent Document 1 discloses that a bending moment acting on a cross member due to a side collision load of a vehicle is reduced, and a structure that generates a high reaction force in the vehicle width direction is combined with a rocker (side sill). A structure in which a fragile portion having a substantially triangular notch is provided on the lower surface of the end portion of the cross member is described.

  In the vehicle body structure described in Patent Document 1, when the side collision load of the vehicle is input to the center pillar, the lower part of the rocker (side sill) rotates to the outside of the vehicle body, and the upper part of the notch of the cross member is weak. When the portion is crushed, the bending moment acting on the cross member is reduced.

JP-A-11-99967

  By the way, in the vehicle body structure described in Patent Document 1, in order to relieve the side collision load, the upper part of the rocker is temporarily turned to the inside of the vehicle body to crush the fragile portion, and then the side collision load is applied to the cross member. It is necessary to ensure the rigidity by transmitting to. In this case, there is a possibility that the upper part of the rocker may fall into the vehicle interior side and the center pillar may greatly enter the vehicle interior.

  In view of the above, the present invention provides a vehicle body undercarriage which can be transmitted and dispersed from the cross member to the vehicle body while relaxing the side collision load of the vehicle and can regulate the amount of the pillars entering the vehicle interior within a predetermined range. It is an object to provide a side structure.

  A vehicle body lower side structure according to the present invention is a vehicle body lower side structure in which an end portion of a cross member is coupled to a rocker to which a lower end portion of a pillar is coupled, and an upper portion of the rocker is directed to a vehicle body at a predetermined angle. It is characterized in that there is provided a tilting permission portion that allows only tilting.

  In the vehicle body lower side structure according to the present invention, when the side collision load of the vehicle is input to the pillar on the side of the vehicle body, the upper part of the rocker tilts toward the inside of the vehicle body, and the side collision load is alleviated by this tilting. . At this time, since the upper portion of the rocker tilts within a predetermined angle range, the intrusion amount of the pillar into the vehicle interior is regulated within the predetermined range according to the tilt angle. Then, when the upper part of the rocker presses the cross member in the axial direction, the mitigated side collision load is transmitted from the cross member to the vehicle body and dispersed.

  In the vehicle body lower side structure according to the present invention, it is preferable that the rigidity of the tilting permissible portion is strengthened because the side collision load can be reliably transmitted from the rocker to the cross member side.

  As means for strengthening the rigidity of the tilt allowing portion, the member constituting the tilt allowing portion is made of a high-tensile steel plate or an ultra-high strength steel plate, and the member constituting the tilt allowing portion is subjected to appropriate quenching treatment or surface hardening treatment. In other words, it is possible to stiffen a member constituting the tilt allowing portion with an appropriate stiffener.

  As a means to reinforce the rigidity of the tilt allowance part, if the upper part facing the inside of the rocker body is stiffened with a stiffening material extending in the longitudinal direction of the vehicle body, the rocker should sufficiently receive the frontal collision load of the vehicle Become.

  According to the vehicle body lower side structure according to the present invention, when a vehicle side collision load is input to the vehicle body side pillar, the upper part of the rocker tilts toward the vehicle body inner side. Can be relaxed. At this time, since the upper part of the rocker tilts within a range of a predetermined angle, the amount of penetration of the pillar into the vehicle interior can be regulated within the predetermined range according to the tilt angle. Then, when the upper part of the rocker presses the cross member in the axial direction, the relaxed side collision load can be transmitted from the cross member to the vehicle body and dispersed.

  According to the vehicle body lower side structure of the present invention in which the rigidity of the tilt allowing portion is reinforced, it is possible to reliably transmit the side collision load from the rocker to the cross member side. Here, as a means for strengthening the rigidity of the tilt allowing portion, when the upper part of the rocker facing the vehicle body is stiffened by a stiffener extending in the longitudinal direction of the vehicle body, the rocker sufficiently absorbs the frontal collision load of the vehicle. I can take it.

1 is a perspective view showing an appearance of a vehicle body lower side structure according to a first embodiment of the present invention. It is sectional drawing of the principal part of the vehicle body lower side part structure which concerns on 1st Embodiment. It is sectional drawing of the principal part which shows the effect | action of the vehicle body lower part structure which concerns on 1st Embodiment. It is sectional drawing of the principal part of the vehicle body lower part structure which concerns on 2nd Embodiment. It is sectional drawing of the principal part which shows the effect | action of the vehicle body lower part structure which concerns on 2nd Embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out a vehicle body lower side structure according to the present invention will be sequentially described with reference to the accompanying drawings. In the following description, the same or similar components may be denoted by the same reference numerals and redundant description may be omitted.

  First, the vehicle body lower side part structure which concerns on 1st Embodiment with reference to FIGS. 1-3 is demonstrated. As shown in FIG. 1, the vehicle body lower side structure of the first embodiment includes a rocker (side sill) 1 disposed in the vehicle lower side portion and extending in the front-rear direction.

  A lower end portion of the front pillar 2 is coupled to the front end portion of the rocker 1, a lower end portion of the rear pillar 3 is coupled to the rear end portion, and a lower end portion of the center pillar 4 is coupled to the center portion in the front-rear direction. And the end part of the cross member 5 extended in the width direction of a vehicle body is couple | bonded with the center part of the front-back direction of the rocker 1 with which the lower end part of the center pillar 4 was couple | bonded.

  As shown in FIG. 2, the rocker 1 has a vertically long, substantially rectangular hollow section obtained by joining a rocker outer 1A and a rocker inner 1B each having a groove-shaped cross-sectional shape. An upper joining piece 1C and a lower joining piece 1D are formed, and an upper joining piece 1E and a lower joining piece 1F as joining parts are formed on the rocker inner 1B.

  The center pillar 4 has a hollow cross section in which the center pillar outer 4A and the center pillar inner 4B are joined, and the lower end portion of the center pillar outer 4A is formed on the side wall portion of the rocker outer 1A constituting the outer wall portion of the rocker 1. The lower end portion of the center pillar inner 4B is joined from the upper wall portion of the rocker outer 1A to the upper joint piece 1C.

  The cross member 5 is composed of a groove-shaped cross-sectional upper member 5A joined to the upper surface of the floor panel 6 and a groove-shaped cross-sectional lower member 5B joined to the lower surface of the floor panel 6. The end of the cross member lower 5B is joined to the lower half of the side wall of the rocker inner 1B that constitutes the inner wall of the rocker 1.

  Here, in the vehicle body lower side structure of the first embodiment, when the side collision load of the vehicle is input to the center pillar 4, the rocker 1 can be tilted by a predetermined angle with the upper half of the rocker 1 facing the vehicle body inside. A tilt allowing portion is provided.

  That is, at the end of the cross member upper 5A joined to the upper surface of the floor panel 6 in the cross member 5, an inclined receiving surface 5C having an angle α facing the side wall of the rocker inner 1B constituting the inner wall of the rocker 1 is formed. Has been.

  On the other hand, on the inner side of the upper ridge line portion between the side wall portion and the upper wall portion of the rocker inner 1B facing the inclined receiving surface 5C of the cross member upper 5A, a stiffener extending in the longitudinal direction of the vehicle body with an L-shaped cross section. 7 is attached.

  In the vehicle body lower side structure of the first embodiment configured as described above, when a side collision load as indicated by a white arrow in FIG. 3 is input to the center pillar 4 on the vehicle body side, The half part tilts toward the inside of the vehicle body as indicated by the dotted line, and the side collision load is alleviated by this tilting.

  Here, since the upper ridge line portion between the side wall portion and the upper wall portion of the rocker inner 1B is stiffened by the stiffener 7, the upper half portion of the rocker 1 tilting toward the inside of the vehicle body is stiffened. Tilt is surely restricted at a position where the upper ridge line portion of the rocker inner 1B stiffened by the material 7 is in contact with the inclined receiving surface 5C of the cross member upper 5A of the cross member 5. That is, the upper portion of the rocker 1 is reliably restricted from tilting in the range of the predetermined angle β, and the intrusion amount of the center pillar 4 into the vehicle interior is reliably restricted to the predetermined range according to the tilt angle β.

  Then, the rocker 1 presses the cross member 5 in the axial direction by the side collision load alleviated by the tilt of the upper half of the rocker 1, so that the alleviated side collision load is transmitted from the cross member 5 to the vehicle body and dispersed. Is done.

  Therefore, according to the vehicle body lower side structure of the first embodiment, when a side collision load is input to the vehicle, the side collision load can be reliably reduced. Further, at that time, the amount of intrusion of the center pillar 4 into the vehicle interior can be reliably regulated within a predetermined range. Furthermore, the relaxed side collision load can be reliably transmitted from the cross member 5 to the vehicle body and dispersed.

  Moreover, according to the vehicle body lower side structure of the first embodiment, when a frontal collision load is input to the vehicle, the frontal collision is caused by the rocker 1 in which the ridge line part of the upper part of the rocker inner 1B is stiffened by the stiffener 7. The load can be received reliably.

  Next, a vehicle body lower side structure according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. In the vehicle body lower side structure according to the second embodiment, the upper half of the rocker 1 is tilted and brought into contact with the upper half of the rocker inner 1B in the rocker 1 as a tilt allowing portion that allows the upper half of the rocker 1 to tilt toward the inner side of the vehicle. A surface 1G is formed.

  The inclined contact surface 1G is formed by an inclined wall portion that connects the side wall portion of the rocker inner 1B and the upper joining piece 1E, and has a predetermined gap between the cross member 5 and the substantially vertical end portion of the cross member upper 5A. The angle γ is formed.

  In the vehicle body lower side structure of the second embodiment, when a side collision load as shown by a hollow arrow in FIG. 5 is input to the center pillar 4 on the vehicle body side, the upper half of the rocker 1 is indicated by a dotted line. Tilt toward the inside of the vehicle body, and the side impact load is relieved by this tilting.

  At this time, the upper half part of the rocker 1 tilting toward the inner side of the vehicle body comes into contact with the inclined contact surface 1G of the upper half part of the rocker inner 1B on the substantially vertical end of the cross member upper 5A in the cross member 5. Further tilting is restricted. That is, the upper portion of the rocker 1 is reliably restricted from tilting within a range of a predetermined angle γ, and the amount of intrusion of the center pillar 4 into the vehicle compartment is reliably controlled within a predetermined range according to the tilt angle γ.

  Then, the rocker 1 presses the cross member 5 in the axial direction by the side collision load alleviated by the tilt of the upper half of the rocker 1, so that the alleviated side collision load is transmitted from the cross member 5 to the vehicle body and dispersed. Is done.

  Therefore, the vehicle body lower side structure of the second embodiment can provide the same effects as the vehicle body lower side structure of the first embodiment.

  The vehicle body lower side structure according to the present invention is not limited to the above-described embodiments. For example, the cross member upper 5A of the cross member 5 shown in FIG. 2 is assumed to have a substantially vertical end and no inclined receiving surface 5C, and the same inclination as the inclined receiving surface 5C on the cross member upper 5A. A separate reinforcing member having a receiving surface may be joined.

  Further, as means for reliably transmitting the side collision load from the rocker 1 to the cross member 5 side, the cross member upper 5A, the reinforcing member 8 and the rocker inner 1B constituting the tilting allowance portion are formed of a high strength steel plate or an ultra high strength steel plate. Then, the rigidity may be strengthened.

  Alternatively, the inclined receiving surface 5C of the cross member upper 5A and the inclined contact surface 1G of the rocker inner 1B may be subjected to appropriate quenching treatment or surface hardening treatment to enhance the rigidity thereof.

  DESCRIPTION OF SYMBOLS 1 ... Rocker, 1A ... Rocker outer, 1B ... Rocker inner, 1C ... Upper joining piece, 1D ... Lower joining piece, 1E ... Upper joining piece, 1F ... Lower joining piece, 1G ... Inclined contact surface, 2 ... Front pillar, 3 ... Rear pillar, 4 ... center pillar, 4A ... center pillar outer, 4B ... center pillar inner, 5 ... cross member, 5A ... cross member upper, 5B ... cross member lower, 6 ... floor panel, 7 ... stiffener.

Claims (3)

A vehicle body lower side structure in which an end of a cross member is coupled to a rocker to which a lower end of a pillar is coupled,
2. A vehicle body lower side structure characterized in that a tilt allowing portion is provided that allows the upper portion of the rocker to tilt by a predetermined angle toward the inside of the vehicle body.   The vehicle body lower side structure according to claim 1, wherein rigidity of the tilt allowing portion is reinforced.   The vehicle body lower side structure according to claim 2, wherein an upper portion of the rocker facing the vehicle body is stiffened by a stiffener extending in the vehicle longitudinal direction.

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