JP4310246B2 - Vehicle door beam - Google Patents

Description

  The present invention relates to a door beam provided along the front-rear direction inside a vehicle door.

In order to reduce the deformation amount of the vehicle body or the door when the automobile receives an impact load from the front or the side, a door beam is arranged along the front-rear direction inside the door.
As a conventional door beam, as shown in FIG. 5, two hot-rolled steel plates are pressed into a Z shape, and are spot-welded to face each other to form a rectangular cross-section pipe beam 820, or FIG. As shown, there is a door beam 920 using a hardened steel pipe having a round cross section.

On the other hand, a door glass elevating mechanism 30 for opening and closing the window glass is provided inside the door. As shown in FIG. 2, the door glass elevating mechanism 30 includes a drive device 37 and a lift arm 31 that is rotated by a drive device 37 so that the tip is raised and lowered around a rotation shaft 3013 provided on the base end side. And an equalizer arm 303 having a middle portion in the longitudinal direction coupled to the lift arm 31 and a lower end of the door glass 40 so as to be pivotable about a pivot shaft 319 provided in the middle in the length direction of the lift arm 31. A lifting rail 41 that is fixed and slidably engages with the tip of the lift arm 31 and one end of the equalizer arm 303, and an equalizer so that the lifting rail 41 maintains a horizontal state while the lift arm 31 rotates. A center guide 39 that slidably engages with the other end of the arm 303 and adjusts its posture is provided.
The equalizer arm 303 includes an outer arm portion 35 that forms a half on the lifting rail 41 side and an inner arm portion 33 that forms a half on the center guide 39 side. The end of the inner arm 33 on the rotating shaft 319 side is overlapped with the inner side of the lift arm 31, and the end of the outer arm 35 on the rotating shaft 319 side is overlapped with the outer side of the lift arm 31. Both ends are coupled to each other through an opening 3030 formed in the lift arm 31.

  The door beams 820 and 920 need to be arranged at a height within a predetermined range in order to secure the above functions, and need to be arranged at a position where a cross section as large as possible can be secured in terms of strength. In order to satisfy these conditions, the door beams 820 and 920 have the upper edge positioned near the lower end of the inner arm portion 33 with the door glass 40 in the lowest position, and the lift arm 31 and It arrange | positions so that it may be located between the outer side arm part 35 and the door inner board 13. As shown in FIG. In addition, a gap K of a required dimension is secured between the door beams 820 and 920 and the arm portions 33 and 35 of the lift arm 31 and the equalizer arm 303 in consideration of rattling during vehicle vibration and variations in the assembly position. Yes.

As other examples of the door beam, there are JP-A-6-40255 (hereinafter referred to as “Patent Document 1”) and JP-A-7-89345 (hereinafter referred to as “Patent Document 2”).
The “vehicle door impact beam” described in Patent Document 1 is made of a hollow material in the shape of a square pipe having a rounded radius of curvature R on the outside of the corner portion of the cross section. By defining the relationship and satisfying the rise of the characteristic curve, it is possible to obtain a large deflection until buckling (see paragraphs “0011” and “0015” of Patent Document 1).

The “vehicle door beam” described in Patent Document 2 includes a beam main body that is provided obliquely up and down with different heights on the front end side and the rear end side, a pair of upper and lower short sides along the vehicle width direction, and a height. It is a vertically long rectangular cross-section rectangular pipe having a pair of left and right long sides that are longer than the short side and four corners where these sides intersect. Energy absorption performance can be exhibited (see paragraphs “0007” and “0009” of Patent Document 2).
JP-A-6-40255 JP 7-89345 A

  However, in the conventional door beam, it is necessary to increase the plate thickness or the cross-sectional area to increase the strength, but there is a problem that the weight increases as the plate thickness increases, and an attempt is made to increase the cross-sectional area. In addition, the vertical width dimension is limited by the inner arm portion 33 positioned above, and the horizontal width dimension is limited by the lift arm 31 and the outer lift arm 35 and the door inner plate 13 positioned on the left and right sides.

  Accordingly, an object of the present invention is to provide a vehicle door beam that can increase the strength in a limited space without increasing the plate thickness in order to solve the above-described problems.

According to a first aspect of the present invention, there is provided a vehicle door beam comprising: an outer arm portion that moves up and down by an operation of a door glass raising / lowering mechanism disposed inside the door to raise and lower the door glass; An inner arm portion disposed on the inner plate side, and in a state where the door glass is in the lowest position, a first space is formed between the door inner plate and the outer arm portion, The door between the first space and the second space of a vehicle door in which a second space is formed between the door inner plate and the inner arm portion above or below the one space. It is a vehicle door beam provided along an inner plate, and is composed of an upper pipe and a lower pipe, which are fixed by superimposing pipes having a rectangular cross section on top of each other, and one of the two pipes is more than the other pipe. Small horizontal dimension Ku, wherein arranged on one of the pipe the second space, the other pipe is characterized in that it is disposed in the first space.
According to the present invention, when there is a second space having a width dimension smaller than the first space above or below the first space, a part of the door beam in the vertical direction can be disposed in the second space. Therefore, the cross-sectional area can be increased correspondingly, and the strength can be increased. In addition, since the door beam is composed of two pipes that are fixed while being overlapped with each other, the strength can be further increased.
Further, according to the present invention, the bottom wall of the upper pipe and the upper wall of the lower pipe are horizontally overlapped, so that the bending strength in the lateral direction can be particularly increased.

According to a second aspect of the present invention, there is provided the vehicle door beam according to the first aspect , wherein each of the pipes is formed by forming a round cross-sectional pipe into a rectangular cross-sectional shape. And
According to the present invention, the upper pipe and the lower pipe have different cross-sectional shapes. However, since these are formed from the same shape material, they can be manufactured at low cost.

  According to the vehicle door beam of the present invention, the strength can be increased in a limited space without increasing the plate thickness.

Next, an embodiment of a vehicle door beam according to the present invention will be described with reference to the drawings. The vehicle door beam of the present embodiment is provided at the front door of a cab-over vehicle.
Here, FIG. 1 is a side view of the front portion of the cab-over vehicle, and FIG. 2 is a side view in which the outer plate of the front door is omitted. 3 is a cross-sectional view taken along line III-III in FIG.

The configuration of the front door equipped with the vehicle door beam of the present embodiment will be described.
The front door 10 is composed of an outer plate 11 and an inner plate 13 that are press-formed from a steel plate, and the door glass 40 and the door glass lifting and lowering that opens and closes the door glass 40 in its inner space. A mechanism 30, front and rear run channels 51 and 53 for guiding the raising and lowering of the door glass 40, a door beam 20 extending in the front-rear direction of the front door 10, and the like are provided.
As shown in the sectional view of FIG. 3, the door glass 40 is arranged on the outer plate 11 side of the door glass elevating mechanism 30, and the door beam 20 is arranged on the inner plate 13 side of the door glass elevating mechanism 30.

  The door glass raising / lowering mechanism 30 has a base 301 fixed to the door inner plate 13, a driving device 37 fixed to the base 301, and a rotation shaft 3013 provided on the base end side by the driving device 37. A lift arm 31 that is pivoted so as to move up and down, and a middle portion in the length direction are coupled to the lift arm 31 so as to be pivotable about a pivot shaft 319 provided in the middle of the lift arm 31 in the length direction. The equalizer arm 303, the lifting rail 41 fixed to the lower end of the door glass 40 and slidably engaged with the tip of the lift arm 31 and one end of the equalizer arm 30, and while the lift arm 31 rotates, A center guide 39 that slidably engages with the other end of the equalizer arm 30 and adjusts its posture so as to maintain the rail 41 in a horizontal state.

  The lift arm 31 is supported by a rotating shaft 3013 provided on the base 301, and a fan-shaped gear portion 311 that forms a tooth shape that meshes with a gear that is rotated by a driving device 37, and the gear portion 311 has a rotating shaft 3013. The arm portion 313 extends to the other side of the arm portion 313 and is engaged with the lifting rail 41 via a roller 331 attached to the tip of the arm portion 313.

The equalizer arm 303 includes an outer arm portion 35 that forms a half on the lifting rail 41 side and an inner arm portion 33 that forms a half on the center guide 39 side. The end of the inner arm 33 on the rotating shaft 319 side is overlapped with the lift arm 31 on the vehicle interior side, and the end of the outer arm 35 on the rotating shaft 319 side is overlapped with the lift arm 31 on the vehicle interior side. Both ends are coupled to each other through an opening 3030 formed in the lift arm 31.
The inner arm portion 33 and the outer arm portion 35 are substantially in a straight line when viewed from the side, and the end of the inner arm portion 33 opposite to the rotation shaft 319 is supported by the center guide 39 so as to be movable. The end opposite to the rotating shaft 319 is supported by the lifting rail 41 so as to be movable.
As shown in FIG. 3, in the state where the door glass 40 is in the lowest position, a first space S1 is formed between the lift arm 31 and the outer arm portion 35 and the door inner plate 13, A second space S2 is formed between the inner arm portion 33 and the door inner plate 13. As described above, since the inner arm portion 33 is disposed closer to the door inner plate 13 than the lift arm 31 and the outer arm portion 35, the left-right width dimension of the second space S2 is the left-right width dimension of the first space S1. Smaller than.

  The door glass 40 is supported by a front run channel 51 at its front end and a rear run channel 53 at its rear end so as to be slidable up and down. A lift rail 41 is attached to the lower end of the door glass 40 via brackets 43 and 44, and the tip of the lift arm 31 and the tip of the outer arm portion 35 are attached to the lift rail 41 via rollers 331 and 331. It is linked so that it can roll.

As shown in FIGS. 3 and 4, the door beam 20 is composed of an upper pipe 21 and a lower pipe 23 having a rectangular cross section which are fixed to be overlapped with each other. The upper pipe 21 and the lower pipe 23 are fixed to each other by welding both side edges of the bottom wall of the upper pipe 21 to the upper wall of the lower pipe 23 at a plurality of positions in the longitudinal direction. Brackets 25 and 27 are fixed to the front end and rear end of the door beam 20 by welding, and the door beam 20 is fixed to the door inner plate 13 via the brackets 25 and 27.
In a state where the door glass 40 is at the lowest position, the lower pipe 23 is disposed in the first space S1, and the upper pipe 21 is disposed in the second space S2. The left-right width dimension t of the upper pipe 21 is set so that a gap K1 having a required dimension can be secured between the inner arm 33 in the door thickness direction in consideration of rattling during vehicle vibration and variations in the assembly position. ing. Similarly, the right and left width dimension T of the lower pipe 23 can ensure a required gap K2 between the lift arm 31 and the outer arm 35 in the door thickness direction. Is set to
Since the left-right width dimension of the second space S2 is smaller than the left-right width dimension of the first space S1, the left-right width dimension t of the upper pipe 21 is set smaller than the left-right width dimension T of the lower pipe 23. Yes.

The upper pipe 21 and the lower pipe 23 are manufactured by drawing two standard-grade steel pipes having the same circular cross-section and drawing them into rectangular cross-sectional shapes with different cross-sectional dimensions, followed by quenching after forming. For this reason, the upper pipe 21 and the lower pipe 23 have different height dimensions due to the different dimensions t and T in the door thickness direction.
Specifically, the upper pipe 21 and the lower pipe 23 are formed from two standard steel pipes having a round cross section with an outer diameter of 18 mm and a plate thickness of 2.8 mm, and the dimension t in the door thickness direction of the upper pipe 21 is 17. 4 mm, the height is 37.7 mm, the dimension T of the lower pipe 23 in the door thickness direction is 20.0 mm, and the height is 35.2 mm.
Note that the surfaces of the upper and lower pipes 21 and 23 on the door inner plate 13 side are on the same plane as is apparent from the cross-sectional view of FIG.

  The operation of the door glass lifting mechanism and the vehicle door beam configured as described above will be described. As shown in FIG. 2, when the door glass 40 is fully open and is in the lowest position, as shown in FIG. 3, the upper pipe 21 is in the second space S2, that is, on the side of the rotating shaft 319 of the inner arm portion 33. The gap K1 is secured between the upper pipe 21 and the end of the inner arm portion 33 on the rotating shaft 319 side.

  The lower pipe 23 is located at a height that overlaps the lift arm 31 and the outer arm portion 35 in a side view in the first space S1, that is, below the end of the inner arm portion 33 on the rotating shaft 319 side, A gap K2 is secured between the lower pipe 23 and the lift arm 31, and a gap K3 is secured between the lower pipe 23 and the outer arm portion 35.

When the drive device 37 of the door glass raising / lowering mechanism 30 is operated and the gear portion 311 of the lift arm 31 is rotated counterclockwise in FIG. 2 about the rotation shaft 3013, the tip of the arm portion 313 is moved to the raising / lowering rail 41. The vehicle rolls up to the rear of the vehicle, and the lifting rail 41 and thus the door glass 40 rises.
Further, since the rotation shaft 319 is also lifted while rotating about the rotation shaft 3013, the outer arm portion 35 that is rotatably supported by the rotation shaft 319 and the roller 331 at the other end support the lifting rail 41. The arm 313 rises while rolling in the direction opposite to the rolling direction of the arm 313 (front of the vehicle), the inner arm 33, and the roller 331 at the other end rolls the center guide 39 to the rear of the vehicle. Then, the door glass 40 is gradually closed by rotating while turning in the direction in which the X-shape composed of the inner arm portion 33 and the outer arm portion 35 is crushed.

If the rotation is further continued, the tip of the arm portion 313, the tip of the outer arm portion 35, and the turning shaft 319 eventually become a straight line on the straight line connecting the turning shaft 3013 and the tip of the inner arm portion 33. After passing, the X-shape reverses and rises, and the door glass 40 is fully closed.
The outer arm portion 35, the door glass 40, the lifting rail 41, and the like are arranged outside the lift arm 31, and the dimension of the lower pipe 23 in the door thickness direction is formed with a required thickness. Even if it is arranged at a height position overlapping in a side view, there is no interference.

  Next, when a vehicle equipped with the door beam 20 receives an impact load from the front, the vehicle body tries to deform so that the door opening is crushed in the front-rear direction, but the door beam 20 is stretched to prevent this deformation. At this time, a force compressing in the front-rear direction acts on the door beam 20, but the door beam 20 is not only the lower pipe 23 disposed below the end of the inner arm 33 on the rotating shaft 319 side, but also the inner arm. Since the upper pipe 21 arranged at a position overlapping the end portion of the portion 33 on the rotating shaft 319 side in a side view is also provided, the door beam is provided with the end portion on the rotating shaft 319 side of the inner arm portion 33 as in the conventional art. Since the strength is higher than those disposed below, it is possible to withstand higher loads. In addition, since the bottom wall of the upper pipe 21 and the upper wall of the lower pipe 23 are horizontally overlapped and joined, compared with the case where the door beam is formed with a single pipe as in the prior art, the lateral wall is particularly lateral. Bending strength is high.

In addition, this invention is not limited to the thing of the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, in the above-described embodiment, the door beam is formed from a round pipe into a rectangular cross section. However, the present invention is not limited to this, and it is also possible to use rectangular cross-section pipes having different sizes from the beginning.
Moreover, although the door glass raising / lowering mechanism was demonstrated with the X arm type, a wire type may be sufficient.

It is a side view of the front part of the cab over vehicle which equipped with the door beam for vehicles concerning one embodiment of the present invention. It is the side view which abbreviate | omitted the outer plate | board of the front door which mounted | wore with the vehicle door beam which concerns on one embodiment of this invention. It is sectional drawing which follows the III-III line of FIG. It is a perspective view of the door beam for vehicles concerning one embodiment of the present invention. It is sectional drawing of the door equipped with an example of the conventional door beam. It is sectional drawing of the door equipped with the other example of the conventional door beam.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Front door 11 Outer plate 13 Inner plate 20 Door beam 21 Upper pipe 23 Lower pipe 30 Door glass raising / lowering device 31 Lift arm 33 Inner arm part 35 Outer arm part 40 Door glass 41 Lifting rail

Claims (2)

In order to raise and lower the door glass, it has an outer arm part that moves up and down by operation of a door glass raising and lowering mechanism arranged inside the door, and an inner arm part that is arranged closer to the door inner plate than the outer arm part. In a state where the door glass is at the lowest position, a first space is formed between the door inner plate and the outer arm portion, and the door inner plate and the inner side are above or below the first space. A vehicle door beam provided along the door inner plate between the first space and the second space of a vehicle door in which a second space is formed between the arm portion ,
An upper pipe and a lower pipe, which are fixed by superimposing pipes having a rectangular cross section on top of each other, one of the two pipes is smaller in the left-right width direction than the other pipe, and the one pipe is the first pipe. The vehicle door beam is characterized in that the second pipe is disposed in the first space and the other pipe is disposed in the first space. The vehicle door beam according to claim 1 ,
A vehicular door beam, wherein each of the pipes is formed by forming a round cross-section pipe having the same shape into a rectangular cross-section.

Images