JP2000344129A - Frame for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the height of the frame body of a suspension section while securing rigidity by forming a cutout section on the lower face of the frame body of the suspension section, arranging a bottom plate on the cutout section, and faying the front and rear slant sections of the bottom plate to the slant faces on the lower face of the frame body. SOLUTION: The front and rear lower faces 11c of a suspension section 13 formed on a frame main body 11 constituting the vertical frame of a vehicle are formed into slant faces 11d inclined upward, and the suspension section 13 between the upper ends of both slant faces 11d are cutout to form a cutout section 11e. A bottom plate 15 is arranged on the notch section 11e, and slant sections 15a formed at the front and rear of the bottom plate 15 are fayed to the slant faces 11d on the lower face of the frame main body 11 by welding. An L-shaped reinforcing member 17 having an upper face 17a and a side face 11b is arranged to face the side face 11b of the frame main body 11, the upper face 17a is fayed to the inside of the upper face 11a of the frame main body 11, and the lower end of the side face 17b is fayed to the bottom plate 15 by welding respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle frame used for vehicles such as trucks and buses.

[0002]

2. Description of the Related Art FIG. 7 shows a frame structure of a conventional vehicle. In this frame structure, a pair of vertical frames 1 are arranged at an interval in the left-right direction. 2 are connected. And
The pair of vertical frames 1 is formed with a suspension section 3 for arranging an air suspension.

As shown in FIG. 8, a vertical frame 1 has a frame main body 5 having an upper surface 5a, side surfaces 5b, and a lower surface 5c and having a U-shaped cross section. In the suspension section 3 where the air suspension is arranged, the height of the frame body 5 in the vertical direction is narrowed in order to secure a space in the vertical direction in which the air suspension is arranged.

That is, in the suspension portion 3, lower surfaces 5c before and after the suspension portion 3 of the frame body 5 are inclined upward to form an inclined surface 5d, and a lower surface 5e is formed at a position connecting the upper ends of the inclined surfaces 5d. Is formed. As shown in FIG. 9, a reinforcement 6 is joined to the suspension unit 3 at a position facing the side surface 5 b of the frame body 5 to reinforce the suspension unit 3.

[0005] A seat plate 7 for mounting an air suspension is disposed on the lower surface 5e of the frame body 5. On the other hand, recently, low-floor type buses with a floor as low as possible have been developed in order to improve getting on and off the bus. In such vehicles, the height of the frame body 5 in the suspension unit 3 has been increased. There is a demand for a smaller size.

[0006]

However, in the conventional frame structure, when the height of the frame body 5 in the suspension portion 3 is reduced, there is a problem that the section modulus is reduced and the rigidity of the frame body 5 is reduced.
In addition, when a dedicated vertical frame 1 is used for a low-floor type bus or the like, there is a problem in that the types of the frame main body 5 increase and the manufacturing cost increases.

The present invention has been made to solve such a conventional problem, and can reduce the height of a frame body of a suspension portion while maintaining rigidity.
It is another object of the present invention to provide a vehicle frame in which a frame body can be easily shared.

[0008]

According to a first aspect of the present invention, there is provided a vehicle frame having a U-shaped frame body having an upper surface, a side surface, and a lower surface. While forming
A vehicle frame having an inclined surface formed on the lower surface before and after the suspension portion so as to reduce a distance between the upper surface and the lower surface of the frame body in the suspension portion, wherein a lower surface of the suspension portion of the frame body is formed; And a bottom plate is disposed in the notch, and a slope formed before and after the bottom plate is joined to the slope on the lower surface of the frame body.

A vehicle frame according to a second aspect of the present invention is the vehicle frame according to the first aspect, wherein the suspension member of the frame body includes a reinforcing member having an upper surface and a side surface facing the side surface of the frame body. A support for arranging and joining the upper surface of the reinforcing member to the inside of the upper surface of the frame body, and joining the upper surface of the reinforcing member and the bottom plate between the side surface of the frame body and the side surface of the reinforcing member. It is characterized in that a plate is arranged.

(Function) In the vehicle frame according to the first aspect,
The lower surface of the frame main body is cut out in the suspension portion to form a notch. Then, a bottom plate is arranged in the notch, and an inclined portion formed before and after the bottom plate is joined to the inclined surface on the lower surface of the frame main body.

In the vehicle frame according to the present invention, when the load of the suspension acts on the bottom plate, the load is transmitted to the upper surface of the reinforcing member via the side surface of the reinforcing member and the support plate, and the load from the upper surface of the reinforcing member is transmitted. It is transmitted in a state of being dispersed on the upper surface of the frame body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a main part of a first embodiment of a vehicle frame according to the present invention. Since the entire frame structure is configured substantially the same as the frame structure shown in FIG. 7, in this embodiment, a suspension portion having a different structure and a structure in the vicinity thereof will be described in detail.

In FIGS. 1 and 2, reference numeral 11 denotes a frame main body constituting a vertical frame. The frame body 11 has a suspension portion 13 for arranging an air suspension. The frame body 11 includes an upper surface 11a, a side surface 11b, and a lower surface 11c.
Is formed in a U-shaped cross section.

In the suspension section 13, lower surfaces 11c before and after the suspension section 13 of the frame body 11 are inclined upward to form an inclined surface 11d. Then, a portion between the upper ends of the inclined surfaces 11d is cut out in the suspension portion 13, and the notch portion 11e is formed.
Are formed.

As shown in FIG. 3, a bottom plate 15 is disposed in the notch 11e, and an inclined portion 15a formed before and after the bottom plate 15 is formed on an inclined surface 11d on the lower surface of the frame body 11, for example. Joined by welding. Also,
In this embodiment, the side surface 11b of the frame main body 11 is cut out in the notch 11e in a shape corresponding to the bottom plate 15.

In this embodiment, as shown in FIG. 2, a reinforcing member 17 is disposed so as to face the side surface 11b of the frame body 11. FIG. 1 schematically shows the shape of each member. For example, the reinforcing member 17 shown in FIG. 1 is disposed on the frame main body 11 in a state rotated 180 degrees in the horizontal direction from the state of FIG. You.

The reinforcing member 17 has an upper surface 17a and a side surface 1a.
7b. Reinforcement member 17
Is joined to the inside of the upper surface 11a of the frame body 11 by, for example, welding. The lower end of the side surface 17b of the reinforcing member 17 is joined to the bottom plate 15 by, for example, welding.

At the center between the side surface 11b of the frame body 11 and the side surface 17b of the reinforcing member 17, there is disposed a support plate 19 for joining the upper surface 17a of the reinforcing member 17 and the bottom plate 15 by, for example, welding. Have been. The reinforcement 21 is joined to the outside of the side surface 11b of the frame body 11 by, for example, welding.

The reinforce 21 disperses the load acting on the side surface 11b of the frame body 11 in the suspension portion 13 back and forth, and also functions to suppress twisting of this portion. A seat plate 23 to which an air suspension is mounted is joined to the bottom surface of the bottom plate 15 by, for example, welding.

In the above-described vehicle frame, when a suspension load acts on the bottom plate 15 via the seat plate 23,
A load is transmitted to the upper surface 17a of the reinforcing member 17 via the side surface 17b of the reinforcing member 17 and the support plate 19, and the load from the upper surface 17a of the reinforcing member 17 is transmitted in a state of being distributed to the upper surface 11a of the frame body 11. You. In addition, the load acting on the side surface 11b of the frame main body 11 is dispersed back and forth by the reinforcement 21, and at the same time, the torsion of this portion is suppressed.

In the vehicle frame constructed as described above, the lower surface 11c of the frame body 11 is formed by cutting the notch 11e in the suspension portion 13, and the bottom plate 15 is disposed in the notch 11e.
Of the frame body 11
The height of the frame main body 11 of the suspension portion 13 can be reduced while the frame main body 11 is shared because it is joined to the inclined surface 11d of the lower surface 11c.

That is, as shown by a two-dot chain line in FIG. 3, the height H1 of the suspension portion 13 of the conventional frame body 11 is, for example, 175 mm, whereas the above-described vehicle frame has a frame H1. The height H2 of the suspension section 13 of the main body 11 can be set to, for example, about 85 mm. Then, as shown in FIG. 4, the floor of the vehicle can be lowered by H.

That is, FIG. 4 shows a state in which the air spring 33 of the air suspension 31 is arranged on the frame main body 11, in which the solid line indicates the mounting position in this embodiment, and the broken line indicates the conventional mounting position. By arranging the air spring 33 at such a position, the position of the tire 35 is changed from the position shown by the broken line to the position shown by the solid line in FIG.
The floor of the vehicle can be lowered by H.

In the drawings, reference numeral 37 denotes a shock absorber, which is connected to the frame main body 11 via a bracket 39. An air spring 33 is connected to a lower end of the shock absorber 37 via a mounting portion 41. And in the above-mentioned vehicle frame,
In the suspension portion 13 of the frame main body 11, a reinforcing member 17 having an upper surface 17a and a side surface 17b is disposed opposite to the side surface 11b of the frame main body 11, and the upper surface 17a of the reinforcing member 17 is connected to the upper surface 11a of the frame main body 11. Joined to the inside, the side surface 11
b and the side face 17 b of the reinforcing member 17, the reinforcing member 17
Since the support plate 19 that joins the upper surface 17a of the base member 15 and the bottom plate 15 is arranged, the rigidity of the frame body 11 of the suspension portion 13 can be sufficiently maintained.

FIGS. 5 and 6 show a main part of a vehicle frame according to a second embodiment of the present invention. In this embodiment, a bottom plate 15A and a reinforcing member 17A are integrally formed.
It has a U-shaped cross section. Also, the frame body 11
The second reinforcing member 25 is disposed inside the side surface 11b of the second member.

The second reinforcing member 25 has an upper surface 25a and a side surface 25b, and the side surface 25b is joined to the side surface 11b of the frame body 11, for example, by welding. Further, the upper surface 25a is located on the upper surface 17 of the reinforcing member 17A.
It is joined to the lower side of a by, for example, welding. The upper surface 25a of the second reinforcing member 25 and the bottom plate 15A are located between the upper surface 25a of the second reinforcing member 25 and the bottom plate 15A.
And a support plate 19A that joins the two by, for example, welding.

FIG. 5 schematically shows the shape of each member. For example, the reinforcing member 17A and the second reinforcing member 25 shown in FIG.
It is arranged on the frame main body 11 while being rotated by 0 degrees.
In this embodiment, the same effect as that of the first embodiment can be obtained. However, in this embodiment, the rigidity of the suspension portion 13 can be further increased because the second reinforcing member 25 is provided.

[0029]

As described above, in the vehicle frame according to the first aspect, the notch is formed on the lower surface of the suspension portion of the frame body, and the bottom plate is disposed in the notch, and the bottom plate is formed before and after the bottom plate. Since the inclined portion to be formed is joined to the inclined surface on the lower surface of the frame main body, the height of the frame main body of the suspension portion can be reduced while sharing the frame main body.

In the vehicle frame according to the present invention, a reinforcing member having an upper surface and an inner side surface is disposed in the suspension portion of the frame body so as to face the side surface of the frame body, and the upper surface of the reinforcing member is connected to the frame body. Since the support plate that is joined to the inside of the upper surface and that joins the upper surface of the reinforcement member and the bottom plate is arranged between the side surface of the frame body and the side surface of the reinforcement member, the rigidity of the frame body of the suspension part is sufficiently maintained. be able to.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a suspension portion of a vehicle frame according to a first embodiment of the present invention and the vicinity thereof.

FIG. 2 is a sectional view showing a suspension unit of FIG. 1;

FIG. 3 is a front view showing a state where the bottom plate of FIG. 1 is arranged on a frame main body.

FIG. 4 is an explanatory view showing a state where a suspension is arranged on the vehicle frame of FIG. 1;

FIG. 5 is an exploded perspective view showing a suspension portion of a vehicle frame according to a second embodiment of the present invention and the vicinity thereof.

FIG. 6 is a cross-sectional view showing the suspension unit of FIG.

FIG. 7 is a perspective view showing a conventional frame structure.

8 is an exploded perspective view showing the suspension unit of FIG. 7 and its vicinity.

FIG. 9 is a cross-sectional view illustrating the suspension unit of FIG. 8;

[Explanation of symbols]

 11 Frame main body 11a Upper surface 11b Side surface 11c Lower surface 11d Inclined surface 11e Notch portion 13 Suspension portion 15 Bottom plate 15a Inclined portion 17 Reinforcement member 17a Upper surface 17b Side surface 19 Support plate

Claims (2)

[Claims] 1. A suspension body on which a suspension is mounted is formed on a frame body having a U-shaped cross section, which is disposed in the front-rear direction of a vehicle and has an upper surface, a side surface, and a lower surface, and the lower surface before and after the suspension portion. A vehicle frame having an inclined surface for reducing a distance between the upper surface and the lower surface of the frame main body in the suspension portion, wherein a notch portion is formed in a lower surface of the suspension portion of the frame main body; A vehicle frame comprising: a bottom plate disposed in a notch; and a slope formed before and after the bottom plate is joined to the slope on a lower surface of the frame body. 2. The vehicle frame according to claim 1, wherein a reinforcing member having an upper surface and a side surface is disposed in the suspension portion of the frame main body so as to face a side surface of the frame main body, and the reinforcing member is provided. And a support plate for joining the upper surface of the reinforcing member and the bottom plate between a side surface of the frame body and a side surface of the reinforcing member. A vehicle frame characterized by the above-mentioned.