JP2004231039A - Mounting structure of cross car beam for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting structure of cross car beam for a vehicle capable of enhancing a supporting rigidity without increasing its weight and material cost. <P>SOLUTION: This mounting structure of cross car beam for a vehicle is made such that a cross car beam 12 is extended along a vehicle width direction, mounting portions 13 composed of honeycomb structures are arranged at both right and left ends of the cross car beam 12, and the cross car beam 12 is fixed to a vehicle body by fixing the mounting portions 13 to a vehicle body member. The honeycomb structures are provided with a plurality of plate-like ribs 57 extending radially from a central axis 51a of the cross car beam 12 toward a diameter direction. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mounting structure for a cross car beam for a vehicle.
[0002]
[Prior art]
Normally, the cross car beam is disposed inside the instrument panel, and mounting surfaces provided at both left and right sides in the vehicle width direction are fastened to pillar members and a dash panel on the side of the vehicle body via bolts. Here, since the cross car beam needs rigidity to support the instrument panel and the steering device, it is formed using a highly rigid material such as steel (steel). Further, when the cross car beam is molded from synthetic resin, the strength of the mounting surface is maintained by additionally providing a rib on the mounting surface or increasing the thickness of the mounting surface (for example, see Patent Document 1). ).
[0003]
[Patent Document 1]
JP, 2002-211141, A
[Problems to be solved by the invention]
However, the conventional technique has a problem that when the cross car beam is formed from steel or the like, the weight of the cross car beam increases. On the other hand, in the case of molding from the synthetic resin, although the weight is reduced, there is a problem in that the amount of material used is increased due to the increase in the plate thickness or the formation of the ribs, and the material cost is increased.
[0005]
Furthermore, when vent outlets are opened at both left and right ends of the cross car beam, the strength near the vent outlet may be reduced.
[0006]
Therefore, the present invention provides a mounting structure for a cross car beam for a vehicle that can improve the mounting rigidity without increasing the weight or the material cost.
[0007]
[Means for Solving the Problems]
According to the present invention, in the first aspect, a cross car beam is extended along a vehicle width direction, and mounting portions are formed at left and right ends of the cross car beam, and the mounting portion is fixed to a vehicle body member. Accordingly, in the mounting structure for a cross car beam for a vehicle in which the cross car beam is mounted on a vehicle body side via a mounting portion, the mounting portion is formed of a honeycomb structure.
[0008]
The invention according to claim 2 is characterized in that the honeycomb structure includes a plurality of plate-shaped ribs radially extending radially from an axis at both left and right ends of the cross car beam.
[0009]
In the invention according to the third aspect, the cross car beam is formed of a hollow cylindrical body, and a vent blower communicating with the inside of the cross car beam is provided on an outer peripheral surface of the cross car beam near the mounting portion. The outlet is opened.
[0010]
The invention according to claim 4 is characterized in that a steering support portion for supporting a steering device is provided near the mounting portion.
[0011]
In the invention according to claim 5, the cross car beam is formed by a resin inner cylindrical member (first cylindrical member) formed to be shorter than a width between vehicle body members to which the mounting portions at both right and left ends are fixed. ) And an outer shell member (second cylindrical body) which is made of a resin having higher rigidity than the inner cylindrical member and wraps the outer peripheral portion near the terminal of the inner cylindrical member and has the mounting portion at the terminal. It is characterized by having done.
[0012]
【The invention's effect】
According to the first aspect, since the mounting portions at the left and right ends of the cross car beam are formed in the honeycomb structure, the mechanical strength of the mounting portion is improved with almost no increase in material cost and weight. Can be done. Thereby, even if the cross car beam is made of a synthetic resin, it can be securely mounted on the vehicle body side.
[0013]
According to the second aspect, since the mounting portion is formed in the honeycomb structure by the plurality of plate-shaped ribs, the torsional torque input to the cross car beam is efficiently dispersed to the plate-shaped ribs and the vehicle body side Can be transmitted efficiently.
[0014]
According to the third aspect, since the rigidity of the mounting portion of the cross car beam is improved, a decrease in strength due to the opening of the vent outlet in the vicinity of the mounting portion can be suppressed.
[0015]
According to the fourth aspect, since the rigidity of the mounting portion of the cross car beam is improved, the rigidity of the steering support formed near the mounting portion of the cross car beam is also improved. Therefore, the steering device can be reliably held even when the vehicle is running.
[0016]
According to the fifth aspect, the inner cylindrical member, which is the hollow first cylindrical body, is formed to be short so that the rigidity of the cross car beam as a whole is not reduced, and the mounting portion is the second cylindrical body. High rigidity can be maintained by the outer cover member.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0018]
FIG. 1 shows a vehicle cabin of a vehicle body 10 to which a cross car beam mounting structure according to the present embodiment is applied.
[0019]
An instrument panel 11 is provided at a front portion in the vehicle interior, and a cross car beam 12 extends from the driver seat side to the passenger seat side inside the instrument panel 11, that is, in front of the vehicle. Have been.
[0020]
As shown in FIG. 2, mounting portions 13, 13 are provided at both left and right ends of the cross car beam 12, and a mounting surface 51 is formed on the mounting portion 13, and a bolt hole 52 is formed in the mounting surface 51. Are drilled. A dash lower panel 14 is provided on the vehicle front side of the cross car beam 12. The dash lower panel 14 is bent rearward from a side edge in the vehicle width direction of the dash lower panel 14, and a rear edge of the dash lower panel 14 extends from the rear edge of the vehicle. The mounting portions 13 of the cross car beam 12 are fastened to the mounting flanges 15 bent in the directions by bolts 43. Further, the center side of the cross car beam 12 in the vehicle width direction is supported on the upper surface 18a of the tunnel portion 18 of the floor panel via a support stay 16 and an L-shaped mounting bracket 17. A mounting bracket 21 is provided on the front side of the vehicle on the driver's seat side. The mounting bracket 21 is mounted on the rear surface 14a of the dash lower panel 14 via a U-shaped support bracket 48. I have.
[0021]
FIG. 3 is a perspective view of the cross car beam 12 according to the present embodiment. On the driver's seat side of the cross car beam 12, a steering support bracket (steering support portion) 20 for supporting the steering device is provided on the outer peripheral surface on the rear side of the vehicle. A mounting bracket 21 for fixing the car beam 12 to the dash lower 14 is formed. A stud bolt 49 is insert-molded to the steering support bracket 20 so as to protrude downward. On the other hand, an airbag accommodating casing 22 is provided on the rear surface of the passenger seat side, and cylindrical vent outlets 23 and 24 are opened on the upper surfaces of both right and left ends. A rib 25 to which the support stay 16 is connected is formed on the driver's seat side near the center of the cross car beam 12 in the vehicle width direction, and a support stay mounting portion 26 is formed below the rib 25. .
[0022]
FIG. 4 is an exploded perspective view of the cross car beam 12 according to the present embodiment.
[0023]
The cross car beam 12 includes a first cylindrical body 28 formed of resin in advance, and a lid-shaped resin-molded outer periphery of an end of the first cylindrical body 28 on the passenger seat side (left side). It is composed of a member 29 and a second tubular body 30 which is molded from the outer periphery of the first tubular body 28 on the driver's seat side (right side) with resin.
[0024]
The first cylindrical body 28 is composed of an upper half-member half member 31 having a substantially U-shaped cross section and a lower half member 32 having a substantially U-shaped cross section. The longitudinal ends of the half members 31 and 32 are closed by vertical walls 31a and 32a. On the upper surface of the upper half member 31 on the outer side in the vehicle width direction, openings 44, 24 serving as vent outlets 23, 24 are integrally formed by being surrounded by upwardly extending flanges 44a, 24a. I have. On the rear side of the passenger seat side of the lower half member 32, the above-mentioned airbag housing casing 22 is integrally formed in a boxed shape with a bottom opening diagonally upward and rearward. Is provided with an opening 22a for accommodating a disc-shaped airbag inflator (not shown).
[0025]
On the other hand, the end on the inner side in the vehicle width direction of the second cylindrical body 30 is open, and as described above, the rib 25 is formed in the radial direction of the cross car beam 12 so as to surround the entire end. It is integrally formed so as to project continuously. A plate-like mounting flange 13 extending in a substantially vertical direction is provided at an outer end of the second cylindrical body 30 in the vehicle width direction, and extends upward on an upper surface in the vehicle width direction near the mounting flange 13. An air outlet 45 having a flange, a pair of box-shaped steering support brackets 20 having a bottom and opened upward on the rear surface inward in the vehicle width direction, and a mounting bracket 21 on the front surface are integrally formed. It is formed with. The vent outlet 23 in FIG. 3 has a double pipe structure in which the outlet 44 of the first tubular body 28 and the outlet 45 of the second tubular body 30 are in close contact with each other.
[0026]
The left and right ends of the cross car beam 12 are formed on a mounting portion 13 that is mounted on the dash lower panel 14. 5 is a perspective view showing the mounting portion 13 formed at the driver's seat side (right side of the vehicle), and FIG. 6 is a side view of FIG. 5 viewed from the right side.
[0027]
As shown in these figures, the mounting portion 13 is formed in a honeycomb structure. That is, the mounting portion 13 has a plurality of ribs (51, 53, 54, 55, 56) described later in a concave portion opened outward in the vehicle width surrounded by an outer peripheral surface 58 formed in an outer substantially octagonal shape. , 57), the interior of the recess is further partitioned into polygons. More specifically, a mounting surface 51 extending in the vehicle center direction in the vehicle front-rear direction of the mounting portion 13 extends in the vehicle width direction so as to protrude outward from the concave portion in the vehicle width direction. Is formed. Reinforcing ribs 53, 54 extending rearward of the vehicle are formed at upper and lower portions on the vehicle rear side of the mounting surface 51, and the reinforcing ribs 53, 54 are also formed to extend from inside the concave portions. The outside edge of the portion protruding from the vehicle width direction is cut obliquely rearward, and the rear end thereof is connected to the outer peripheral surface 58. In addition, support ribs 55 and 56 are formed in the recessed portion on the vehicle front side of the mounting surface 51 at the same height as the reinforcing ribs 53 and 54 and extend to the front of the vehicle, respectively. That is, the front side of the mounting surface 51 protruding outward from the concave portion in the vehicle width direction overlaps with the mounting flange 51, and is a flush portion where no ribs or the like are formed. The mounting surface 51 has a large thickness at a portion where the bolt hole 52 is formed, and a thin portion between the reinforcing ribs 53 and 54.
[0028]
Further, as shown in FIG. 6, a plurality of fixing ribs 57 extend radially from a radially central portion (axial center) 51a in the concave portion of the mounting surface 51. That is, each of these ribs extends in the radial direction of the mounting portion 13 and is fixed to the inner surface of the outer peripheral surface 58. In addition, the tip of each rib or the like (51, 53, 54, 55, 56, 57) in the present embodiment is connected to a plane portion of an outer peripheral surface 58 which is substantially octagonal. Further, the center side of the mounting portion 13 in the vehicle width direction is also connected to an outlet 45 which is an outer portion of the vent outlet 23 to reinforce this portion.
[0029]
In the present embodiment, as shown in FIG. 6, the outer shape of the mounting portion 13 is formed in a substantially octagonal shape, but is not limited thereto, and may be various polygons, circles, and ellipses. The ribs 53 to 57 are formed as plate-like ribs.
[0030]
In addition, as shown in FIG. 7 which is a cross-sectional view taken along the line AA in FIG. 5, the mounting portion 13 is a part of the second cylindrical body 30, and the second cylindrical body 30 is The outer peripheral side of the body 28 is cast-molded with a highly rigid resin.
[0031]
A method of forming the cross car beam 12 will be briefly described.
[0032]
First, the first cylindrical body 28 is formed. In advance, the upper half member 31 and the lower half member 32 (see FIG. 4) are separately injection-molded with resin, and the peripheral portions 33 and 34 are vibration-welded to each other, so that the inside is formed. The hollow first cylindrical body 28 is formed.
[0033]
Next, the lid-like member 29 and the second cylindrical body 30 are cast around the outer periphery of the left and right ends of the first cylindrical body 28 with resin. The second tubular body 30 can be cast using a mold (not shown) having a simple structure composed of an upper mold, a lower mold, and a side mold.
[0034]
The preformed first cylindrical body 28 is accommodated in a mold, the upper mold, the lower mold and the side mold are moved to close the mold, and the molten resin is injected into the mold and cured. Thereby, the second cylindrical body 30 can be cast around the outer peripheral side of the first cylindrical body 28. Thereafter, the side mold is moved in a substantially horizontal direction indicated by an arrow in FIG. Here, as the molten resin, it is preferable to use a resin having higher strength than the resin constituting the first cylindrical body 28, and for example, a molten resin mixed with fibers can be used.
[0035]
According to the cross-car beam mounting structure according to the present embodiment, of the cross-car beam 12, the left and right mounting portions 13, 13 that require higher rigidity to be mounted on the dash lower panel 14 on the vehicle body side are formed by the honeycomb. Since the cross car beam 12 is configured as a structure, the cross car beam 12 can be securely fastened to the vehicle body side. As shown in FIG. 5, even when the vent outlet 23 is open, the strength in the vicinity of the vent outlet 23 is maintained by the honeycomb structure.
[0036]
Further, conventionally, a dead space is provided between the vent outlet 23 and the mounting surface 51. However, according to the present embodiment, the dead space can be effectively used as the high-rigidity mounting portion 13 having a honeycomb structure. . Further, since the mounting portion 13 is formed in a honeycomb shape by a plurality of ribs, the torsional torque input to the cross car beam 12 is efficiently distributed to the ribs 53 to 57 (see FIG. 6), and the efficiency is increased toward the vehicle body. Can be conveyed in a targeted manner.
[0037]
In addition, since the vent outlet 23 is formed integrally with the inner and outer outlets 44 and 45, the strength of the opening of the vent outlet 23 is further improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a front portion of a vehicle cabin in which a cross car beam according to an embodiment of the present invention is disposed.
FIG. 2 is a perspective view showing an attached state of a cross car beam with an instrument panel of FIG. 1 removed.
FIG. 3 is a perspective view showing the entire cross car beam according to the present embodiment.
FIG. 4 is an exploded perspective view showing the cross car beam according to the present embodiment.
FIG. 5 is a perspective view showing a mounting portion on the driver's seat side of the cross car beam according to the present embodiment.
FIG. 6 is a side view of the mounting portion of FIG. 5 as viewed from the right side.
FIG. 7 is a sectional view taken along line AA of FIG.
[Explanation of symbols]
12 Cross car beam 13 Mounting part 14 Dash lower panel (body member)
20 Bracket for steering support (steering support part)
23, 24 Vent outlet 28 First cylindrical body (inner cylindrical member)
29 Lid member (skin member)
30 Second cylindrical body (skin member)
51a Radial center (axial center)
57 Fixing rib (plate-shaped rib)

Claims (5)

A cross car beam (12) is extended along the vehicle width direction, and mounting portions (13) are provided at left and right ends of the cross car beam (12), and the mounting portion (13) is fixed to a vehicle body member. A vehicle crosscar beam mounting structure in which the crosscar beam (12) is mounted on a vehicle body side;
A crosscar beam mounting structure for a vehicle, wherein the mounting portion (13) is formed of a honeycomb structure. The vehicle according to claim 1, wherein the honeycomb structure includes a plurality of plate-shaped ribs (57) extending radially from an axis (51a) of the cross car beam (12) in a radial direction. Cross car beam mounting structure. The cross car beam (12) is formed of a hollow cylindrical body, and the vent outlet (23) ( The mounting structure for a cross car beam for a vehicle according to claim 1 or 2, wherein the opening (24) is opened. The mounting structure of a cross car beam for a vehicle according to any one of claims 1 to 3, wherein a steering support portion (20) for supporting a steering device is provided near the mounting portion (13). An inner cylindrical member (28) made of a resin and formed to be shorter than a width between body members (14, 14) to which the mounting portions (13) at the right and left ends are fixed; An outer covering member (29) (29) ( 30. The crosscar beam mounting structure for a vehicle according to any one of claims 2 to 4, wherein:

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