JP4055732B2 - Hollow frame member of vehicle - Google Patents

Description

  The present invention relates to a hollow skeleton member of a vehicle configured as a long hollow body having a rectangular cross section.

  A pair of side members extend in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the front portion of the vehicle body, and a suspension lower arm of a front suspension may be directly attached to the side member.

  Further, the side member is formed as a long hollow body having a rectangular cross section, and when a frontal collision load is input from the front of the vehicle body, the side member is axially crushed and absorbs collision energy.

By the way, the side member is formed by combining an upper member and a lower member obtained by dividing the long hollow body in the vertical direction, and formed into an inverted U-shaped cross section that opens the upper member downward, In some cases, the lower member is formed as a closed cross-sectional structure with a rectangular cross section, and the lower members of both side walls of the upper member are welded to both sides of the upper wall of the lower member to form a side member with a cross-section of a letter. In addition, a nut of a mounting bolt for a suspension lower arm, which is another constituent member, is welded and fixed between the upper and lower surfaces of the lower member (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 2002-249066 (page 3, FIG. 1)

  However, the structure of the mounting portion of the suspension lower arm of the conventional side member has a natural deformation (shaft crushing) function with respect to the load in the longitudinal direction. When a load from a lateral direction perpendicular to the longitudinal direction is input to the side member via the lower member, the load is transmitted from the lower member to both side walls of the upper member. Acting in the out-of-plane direction.

  In this case, since the upper member is simply formed in an inverted U-shaped cross section, the angle formed between the upper wall and the side wall of the upper member is easily changed, that is, easily deformed in the lateral direction. As a result, the support rigidity of the mounting bolt is lowered, and the supportability of the suspension lower arm is deteriorated.

  Accordingly, the present invention provides a hollow skeleton member for a vehicle that can ensure lateral rigidity at a mounting portion of another component member while allowing deformation in the longitudinal direction.

The hollow skeleton member of the vehicle of the present invention is formed in a long hollow body having a rectangular cross section,
A long hollow body is formed by joining an upper member having an inverted U-shaped cross-section with an open lower part and a lower member having a U-shaped cross-section having an open upper part while abutting both open ends. ,
A boss portion for attaching another component member is formed on the bottom surface in the open cross section of the lower member, and the long hollow body extends across the outer peripheral surface of the boss portion and the bottom wall and both side walls of the lower member. While providing the first reinforcing rib inclined with respect to the longitudinal direction,
A second reinforcing rib is provided across the upper wall and both side walls of the upper member, corresponding to the formation region of the first reinforcing rib ,
The first reinforcing rib is formed by four radial ribs arranged in a plane X shape around the boss portion,
The second reinforcing rib is perpendicular to each other so as to connect two sets of two points which are opposed to each other among the four points where the radial ribs arranged in an X shape are coupled to the both side walls of the lower member. One of the most important features is that the ribs are formed in parallel with the direction .
Further, the hollow skeleton member of the vehicle of the present invention is formed in a long hollow body having a rectangular cross section,
A long hollow body is formed by joining an upper member having an inverted U-shaped cross-section with an open lower part and a lower member having a U-shaped cross-section having an open upper part while abutting both open ends. ,
A boss portion for attaching another component member is formed on the bottom surface in the open cross section of the lower member, and the long hollow body extends across the outer peripheral surface of the boss portion and the bottom wall and both side walls of the lower member. While providing the first reinforcing rib inclined with respect to the longitudinal direction,
A second reinforcing rib is provided across the upper wall and both side walls of the upper member, corresponding to the formation region of the first reinforcing rib,
The first reinforcing rib is formed by four radial ribs arranged in a plane X shape around the boss portion,
The second reinforcing rib is perpendicular to each other so as to connect two sets of two points which are opposed to each other among the four points where the radial ribs arranged in an X shape are coupled to the both side walls of the lower member. One of the main features is that it is formed by parallel ribs arranged parallel to the direction, or by crossed ribs arranged in a plane X shape so as to connect two sets of two points that are diagonal to each other. Suppose.

According to the present invention, when a lateral load component is input to the lower member from the other constituent members via the boss portion, this load can be distributed to the both side walls and the bottom wall of the lower member via the first reinforcing rib. In addition, since the load input in the out-of-plane direction of the both side walls of the upper member can be supported by the second reinforcing rib, the change in angle between the both side walls and the upper wall of the upper member is suppressed, and The supporting rigidity of the hollow skeleton member can be efficiently increased, thereby avoiding thickening of both side walls of the hollow skeleton member and reducing the weight.
In addition, the hollow skeleton member can absorb the collision energy efficiently by allowing axial crush in the longitudinal direction when a load is applied in the longitudinal direction while securing the rigidity in the lateral direction at the mounting portion of the other constituent members. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 4 show a first embodiment of a hollow skeleton member of a vehicle according to the present invention, FIG. 1 is a perspective view of the hollow skeleton member showing a state where an upper member and a lower member are separated, and FIG. FIG. 3 is a perspective view of a hollow skeleton member showing a state in which the members are integrally coupled, FIG. 3 is a bottom view of the upper member in FIG. 4A showing the upper member and the lower member opened, and a plan view of the lower member in FIG. FIG. 3 is a cross-sectional view of a hollow skeleton member.

  The hollow skeleton member of the vehicle according to the first embodiment is applied to a side member 1 extending in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the front portion of the vehicle body as shown in FIGS. A long hollow body having a rectangular cross section is formed, and a suspension member 2 of a front suspension as another constituent member is attached to the lower surface of the long hollow body.

  A load F1 in the longitudinal direction of the vehicle body is input to the side member 1 from the front during a frontal collision, and a lateral load component F2 that is perpendicular to the longitudinal direction of the side member 1 acts from the suspension member 2 during cornering.

  At this time, the side member 1 is desired to deform (axially crush) the input load F1 in the longitudinal direction to absorb the collision energy and to absorb the input energy F2 in the lateral direction. It is desired to enhance the supportability of the front suspension with high rigidity.

  The side member 1 joins an upper member 10 having an inverted U-shaped cross-section opened at the bottom and a lower member 11 having a U-shaped cross-section opened at the upper side by abutting the respective open side end portions 10a and 11a. It is formed by.

  Each of the upper member 10 and the lower member 11 has a trapezoidal shape in which the open side is widened.

  A boss portion 12 into which a mounting bolt for mounting the suspension member 2 is screwed is formed on the bottom surface of the open section S1 of the lower member 11 at substantially the same height as the side wall 11c. A first reinforcing rib 13 that is inclined with respect to the longitudinal direction of the side member 1 is provided at substantially the same height as the side wall 11c across the bottom wall 11b and both side walls 11c of the lower member 11.

  In addition, the second reinforcing ribs 14 are provided at substantially the same height as the side walls 10c across the upper wall 10b and the both side walls 10c of the upper member 10 so as to correspond to the regions where the first reinforcing ribs 13 are formed.

  As shown in FIG. 3B, the first reinforcing rib 13 is formed of four radial ribs 13a to 13d arranged in a plane X shape with the boss portion 12 as the center.

  As shown in FIG. 3A, the second reinforcing rib 14 has four points Pa to Pd where the radial ribs 13 a to 13 d arranged in a plane X shape are respectively coupled to both side walls 11 c of the lower member 11. Among them, the ribs 14a and 14b are arranged in parallel in the direction perpendicular to the longitudinal direction so as to connect two sets of two points Pa and Pb and Pc and Pd which are opposed to each other on both side walls 11c.

  The lower member 11 is integrally formed of a light alloy such as an aluminum alloy together with the boss portion 12 and the first reinforcing rib 13, and is integrally formed of an aluminum alloy together with the second reinforcing rib 14 even in the upper member 10.

  With the above configuration, according to the side member 1 of the present embodiment, when a load component F2 in the lateral direction is input from the suspension member 2 to the lower member 11 through the boss portion 12 during cornering or the like, the load F2 is The first reinforcing ribs 13 can be distributed to the both side walls 11c and the bottom wall 11b of the lower member 11, and the rigidity of the lower member 11 can be increased at the mounting portion of the suspension member 2.

  The load F2 distributed and input to the both side walls 11c of the lower member 11 is input as an out-of-plane load to the both side walls 10c of the upper member 10, and the load input to the both side walls 10c is the second reinforcing rib. 14, since the change of the angle α between the side walls 10c and the upper wall 10b of the upper member 10 can be suppressed as shown in FIG. 4, the rigidity of the upper member 10 at the mounting portion of the suspension member 2 can be reduced. Can be increased.

  Accordingly, since the rigidity of the attachment portion of the suspension member 2 can be increased by the upper member 10 and the lower member 11 as described above, the support rigidity of the suspension member 2 by the side member 1 can be increased, and the side member 1 It is possible to reduce the weight by avoiding thickening of the side walls 10c and 11c.

  In the present embodiment, in addition to the above-described effects, the first reinforcing rib 13 is formed of four radial ribs 13a to 13d arranged in a plane X shape with the boss portion 12 as the center. The lateral load component F2 inputted to the side member 1 can be distributed over the both side walls 11c of the lower member 11 in a substantially uniform manner over a wide range, and the lateral rigidity of the attachment portion of the suspension member 2 of the side member 1 is further enhanced. be able to.

  Furthermore, the lower member 11 has a structure in which the radial ribs 13a to 13d are arranged in a plane X shape at the attachment portion of the suspension member 2, so that the rigidity in the lateral direction can be increased as described above. When a longitudinal load F1 of a predetermined value or more is input due to a frontal collision, as shown in FIG. 3B, radial distances L1 and L2 between the radial ribs 13a to 13d from the boss portion 12 to both side walls 11c, Since the lower member 11 can be a space for axial deformation (axial collapse), collision energy can be absorbed efficiently.

  The second reinforcing rib 14 has two sets of two points Pa and Pb and Pc and Pd where the radial ribs 13a to 13d arranged in a plane X shape are respectively coupled to both side walls 11c of the lower member 11. Since the parallel ribs 14a and 14b are formed so as to be connected, the rigidity of the upper member 10 in the lateral direction can be increased as described above, and the upper member 10 is formed between the parallel ribs 14a and 14 in the longitudinal direction. Therefore, collision energy can be absorbed efficiently.

  Accordingly, the side member 1 can absorb the collision energy efficiently by allowing axial crush in the longitudinal direction (front-rear direction of the vehicle body) at the time of a frontal collision while securing the rigidity in the lateral direction at the attachment portion of the suspension member 2. it can.

  By the way, the lower member 11 is integrally formed of aluminum alloy together with the boss portion 12 and the first reinforcing rib 13 and is integrally formed of aluminum alloy together with the second reinforcing rib 14 even in the upper member 10. Thus, the rigidity of the mounting portion of the suspension member 2 can be further increased.

  Further, since the hollow skeleton member of the present invention is applied to the side member 1 at the front of the vehicle body to which the suspension member 2 is attached, the energy of the front collision can be efficiently absorbed while the weight of the side member 1 is reduced, and the suspension member The support rigidity of 2 can be increased.

  FIG. 5 shows a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. They are a bottom view of the upper member of (a) shown, and a top view of the lower member of (b).

  In the second embodiment, the second reinforcing ribs 14 formed on the upper member 10 as shown in FIG. 5A are radial ribs 13a to 13d arranged in a plane X shape as shown in FIG. 5B. Are arranged in a plane X shape so as to connect two sets of two points Pa, Pd and Pb, Pc which are diagonally connected to each other among the four points Pa to Pd respectively coupled to both side walls 11c of the lower member 11 The intersecting ribs 14c and 14d are formed.

  Therefore, according to the side member 1 of the second embodiment, the rigidity between the side walls 10a of the upper member 10 can be enhanced by the plane X-shaped intersecting ribs 14c and 14d, and a predetermined value or more can be obtained due to the frontal collision. When a longitudinal load is input, the upper member 10 is deformed in the axial direction (axial collapse) at longitudinal distances L3 and L4 where the intersecting ribs 14c and 14d are coupled to both side walls 10c as shown in FIG. 5A. Therefore, collision energy can be absorbed efficiently.

  6 to 8 show a third embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted, and FIG. FIG. 7 is a perspective view of the hollow skeleton member showing a state in which the members are separated, FIG. 7 is a perspective view of the hollow skeleton member showing a state in which the upper member and the lower member are integrally coupled, and FIG. 8 is a plan view of the lower member.

  In the third embodiment, as shown in FIGS. 6 and 7, two structures shown in the first embodiment are arranged side by side in the longitudinal direction of the side member 1, and the bottom wall 11 b of the lower member 11 has a longitudinal shape. A pair of bosses 12 and 12 project from the bosses 12 and 12 with a predetermined distance in the direction, and the first reinforcing ribs 13 including radial ribs 13a to 13d are provided on the bosses 12 and 12, respectively.

  Further, the upper member 10 is provided with second reinforcing ribs 14 including two sets of parallel ribs 14a and 14b corresponding to the boss portions 12 and 12, respectively.

  A suspension member (not shown) is attached to the pair of boss portions 12 and 12 via mounting bolts.

  Therefore, in this embodiment, the lateral load component F2 input from the suspension member is dispersed over a wide range by the pair of first reinforcing ribs 13 and second reinforcing ribs 14 provided on the lower member 11 and the upper member 10. Therefore, the rigidity of the suspension member mounting portion of the side member 1 can be further increased.

  Of course, even in this embodiment, when the front collision load F1 is input, the longitudinal member is axially crushed, and the lower member 11 is between L5 and L7 as shown in FIG. By being crushed, collision energy can be absorbed efficiently.

  By the way, although the hollow skeleton member of the vehicle of the present invention has been described by taking the first to third embodiments as an example, the present invention is not limited to these embodiments, and various other embodiments can be used without departing from the gist of the present invention. Can be adopted.

It is a perspective view of the hollow frame member which shows the state where the upper member and lower member in the 1st embodiment of the present invention were separated. It is a perspective view of the hollow frame member which shows the state where the upper member and lower member in the 1st embodiment of the present invention were united. It is the bottom view of the upper member of (a) which shows the upper member and lower member in the 1st embodiment of the present invention open, and the top view of the lower member of (b). It is sectional drawing of the hollow skeleton member in 1st Embodiment of this invention. It is the bottom view of the upper member of (a) which shows and shows the upper member and lower member in a 2nd embodiment of the present invention, and the top view of the lower member of (b). It is a perspective view of the hollow skeleton member which shows the state which isolate | separated the upper member and the lower member in 3rd Embodiment of this invention. It is a perspective view of the hollow skeleton member which shows the state where the upper member and lower member in a 3rd embodiment of the present invention were combined together. It is a top view of the lower member in a 3rd embodiment of the present invention.

Explanation of symbols

1 Side member (hollow skeleton member)
2 Suspension member (other components)
DESCRIPTION OF SYMBOLS 10 Upper member 10a Open side edge part of upper member 10b Upper wall of upper member 10c Side wall of upper member 11 Lower member 11a Open side end part of lower member 11b Bottom wall of lower member 11c Side wall of lower member 12 Boss part 13 1st Reinforcement ribs 13a to 13d Radial ribs 14 Second reinforcement ribs 14a to 14b Parallel ribs

Claims (4)

In a hollow skeleton member of a vehicle formed in a long hollow body having a rectangular cross section,
A long hollow body is formed by joining an upper member having an inverted U-shaped cross-section with an open lower part and a lower member having a U-shaped cross-section having an open upper part while abutting both open ends. ,
A boss portion for attaching another component member is formed on the bottom surface in the open cross section of the lower member, and the long hollow body extends over the outer peripheral surface of the boss portion and the bottom wall and both side walls of the lower member. While providing the first reinforcing rib inclined with respect to the longitudinal direction,
A second reinforcing rib is provided across the upper wall and both side walls of the upper member, corresponding to the formation region of the first reinforcing rib ,
The first reinforcing rib is formed by four radial ribs arranged in a plane X shape around the boss portion,
The second reinforcing rib is perpendicular to each other so as to connect two sets of two points which are opposed to each other among the four points where the radial ribs arranged in an X shape are coupled to the both side walls of the lower member. A hollow skeleton member for a vehicle, wherein the hollow skeleton member is formed of parallel ribs arranged in parallel to a direction .   In a hollow skeleton member of a vehicle formed in a long hollow body having a rectangular cross section,
  A long hollow body is formed by joining an upper member having an inverted U-shaped cross-section with an open lower part and a lower member having a U-shaped cross-section having an open upper part while abutting both open ends. ,
  A boss portion for attaching another component member is formed on the bottom surface in the open cross section of the lower member, and the long hollow body extends across the outer peripheral surface of the boss portion and the bottom wall and both side walls of the lower member. While providing the first reinforcing rib inclined with respect to the longitudinal direction,
  A second reinforcing rib is provided across the upper wall and both side walls of the upper member, corresponding to the formation region of the first reinforcing rib,
  The first reinforcing rib is formed by four radial ribs arranged in a plane X shape around the boss portion,
  The second reinforcing rib is in the form of a plane X so as to connect two sets of two points that are diagonal to each other among the four points where the radial ribs arranged in an X shape are respectively coupled to both side walls of the lower member. A hollow skeleton member for a vehicle, characterized in that the hollow skeleton member is formed by cross ribs disposed on the vehicle.   3. The vehicle according to claim 1, wherein the lower member is integrally formed of a light alloy together with the boss portion and the first reinforcing rib, and the upper member is integrally formed of a light alloy together with the second reinforcing rib. Hollow skeleton member.   The hollow skeleton member is a side member extending in the longitudinal direction of the vehicle body on both sides in the vehicle width direction of the front portion of the vehicle body, and the other component member is a suspension member of a front suspension. The hollow skeleton member of a vehicle according to one.

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