JP2001122152A - Cross member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trunnion cross member capable of securing strength and rigidity in a vertical direction with lesser materials than the present. SOLUTION: In this cross member 1 of a chassis frame 2 for a truck having a trunnion type suspension 12, a pair of half members 6 and 6 with substantially U-shaped cross sections are formed by folding a plate material so that upper and lower flanges 4 and 5 are each multiplexed, and perpendicular connecting parts 7 and 7 formed between the upper and lower flanges 4 and 5 of the half members 6 and 6 are joined together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross member constituting a part of a chassis frame such as a truck.

[0002]

2. Description of the Related Art A trunnion type suspension provided on a truck chassis frame formed in the form of a ladder is supported by one of cross members constituting the chassis frame.

As shown in FIG. 7, cross members for supporting the suspension (hereinafter referred to as trunnion cross members) are half members 40 and 4 having a U-shaped cross section.
0 are joined together back to back, and both ends are fixed to side members (not shown).

In particular, the trunnion cross member 41 transmits the load of the vehicle body to a suspension (not shown) to support the vehicle body, and is therefore mainly exposed to a vertical load.
Therefore, vertical rigidity and strength are required, and
Since the space was limited, it was necessary to increase the plate thickness.

[0005]

However, if the plate thickness is increased, the vertical wall 42, which does not significantly affect the rigidity in the vertical direction, becomes thicker, resulting in a heavy and expensive material. Was gone.

Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a trunnion cross member which can secure the strength and rigidity in the vertical direction with less material than the current state.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a cross member of a truck chassis frame having a trunnion type suspension, in which a plate member is folded so that upper and lower flanges are multiplexed, and a cross section is substantially reduced. Form a pair of U-shaped half-split members,
The vertical connecting portions formed between the upper and lower flanges of these half members are joined together.

[0008] The flange may be folded back to the outside of the half member.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing an embodiment of a chassis frame 2 provided with a trunnion cross member 1 according to the present invention. As shown in FIG. 1, the trunnion cross member 1 is provided between a pair of side members 3 and 3 extending in the vehicle length direction so as to extend in the vehicle width direction, and forms a chassis frame 2.

As shown in FIG. 2, the trunnion cross member 1 is formed by folding a plate member made of steel so that the upper and lower flanges 4 and 5 are respectively overlapped with each other to form a half member 6 having a substantially U-shaped cross section. A pair is formed, and the vertical connecting portions 7, 7 formed between the upper and lower flanges 4, 5 of the half members 6, 6 are joined to each other to form a substantially E-shaped cross section.

More specifically, the joining of the half members 6 is performed by, for example, fastening with rivets 8.

The upper and lower flanges 4 and 5 of the trunnion cross member 1 are folded so as to be in close contact with each other, and through holes 9 for riveting the side members 3 are provided near both ends in the longitudinal direction. A plurality is formed.

As shown in FIG. 1, the side members 3, 3
Are formed in a U-shaped cross section, respectively.
They are arranged with their backs facing outward so that the zeros face each other. Each flange 10 is provided with a wide mounting plate 11 for mounting the trunnion cross member 1.

The trunnion cross member 1 is
The upper and lower mounting plates 11 and 11 are arranged so as to be sandwiched between the upper and lower mounting plates 11 and 11, respectively.
5 is fixed by riveting.

A trunnion type suspension 12 is provided below the trunnion cross member 1.

As shown in FIGS. 1 and 3, the suspension 12 is supported via an ear shaft 13 fixed to the trunnion cross member 1 and the side member 3, and a leaf spring 15 fixed to the ear shaft 13. A pair of front and rear axles 16,
17 and the lower link 1 supporting these axles 16 and 17
8 and 19 and upper links 20 and 21.

One end of each of the lower links 18 and 19 is
Are rotatably connected to a rotatable base 14 rotatably provided at both ends, and the other end is rotatably connected to the lower portions of axles 16 and 17 in the up and down direction.

The upper links 20 and 21 are connected to the axle 1
The other end is connected to the trunnion cross member 1 so as to be rotatable in the vertical direction, and the other end is connected to the upper part of the trunnion cross member 1 so as to be rotatable in the vertical direction.

Next, the operation will be described.

In forming the trunnion cross member 1, first, as shown in FIG. 4A, a rectangular steel plate 35 having a uniform thickness is prepared. The size of the steel plate 35 is such that the length L ₁ of _one side is the length of the trunnion cross member 1 and the length L ₂ of the other side is the height of the vertical connecting portion 7 and the width of the upper and lower flanges 4, 5. To the length. At this time, the width of the upper and lower flanges 4 and 5 is set in consideration of the fact that the trunnion cross member 1 is to be manufactured in consideration of being folded in two layers.
Is estimated to be approximately twice the flange width W on one side.

Then, holes 22 and 23 necessary for the vertical connecting portion 7 are formed in advance using a punching machine (not shown) or the like.

Next, the steel plate 35 is set on a press (not shown), and as shown in FIGS. 4 (a) and 4 (b), the boundary line 24 between the upper and lower flanges 4, 5 and the vertical connecting portion 7 is formed. Ni tani fold 2
5 and the return line 26 of the upper and lower flanges 4 and 5
Is subjected to mountain fold 27.

Thereafter, the boundary line 24 between the upper and lower flanges 4 and 5 and the vertical connecting portion 7 and the return line 26 between the upper and lower flanges 4 and 5 are further folded by a press machine, and as shown in FIG. A half-shaped member 6 is formed. The upper and lower flanges 4 and 5 are formed double in a state of being folded outward in a U-shaped cross section.

Then, as shown in FIG. 4D, a plurality of through holes 9 for passing the rivets 8 are formed in the upper and lower flanges 4 and 5, and the other half members 6 of the same shape formed in the same procedure. The vertical connecting portions 7, 7 are overlapped with each other so as to be back to back, and are joined with rivets 8 as shown in FIG.

Thus, the trunnion cross member 1
Is formed.

A trunnion type suspension 12 is attached to the trunnion cross member 1 attached to the side member 3, and a vertical force acts on the trunnion cross member 1. In particular, the upper and lower flanges 4, 5 joined to the side members 3 via the mounting plate 11
The upper and lower flanges 4 and 5 are 2
Since it is formed by being folded in a stack, it does not bend to the force in the vertical direction, and the shape of the chassis frame 2 is easily maintained.

The thickness of the vertical connecting portion 7 is substantially the same as the thickness of the steel plate 35, and the vertical cover 28 formed by joining the vertical connecting portions 7, 7 does not become thick. The weight and material cost of the member 1 can be minimized.

In the above-described embodiment, the upper and lower flanges 4, 5 are folded in two layers, but the present invention is not limited to this, and three or more sheets may be folded in multiple layers.

Although the upper and lower flanges 4 and 5 are double-folded so as to be folded outward in a U-shaped cross section, the upper and lower flanges 29 and 30 may be folded so as to be folded inward as shown in FIG. .

Further, if the strength of the flange is insufficient compared with the strength of the vertical cavity, the flange may be folded multiple times to secure the strength of the flange, without being limited to the trunnion cross member 1.

For example, when the side members require particularly high and low rigidity, as shown in FIG. 6, the side members 31 may also have double-folded upper and lower flanges 32 and 33.

As a result, the rigidity of the upper and lower flanges 32, 33 can be increased without increasing the thickness of the vertical cover 34 of the side member 31, and the weight and material cost of the side member 31 can be minimized.

[0034]

In summary, according to the present invention, the following excellent effects can be obtained.

(1) A cross member particularly requiring vertical rigidity can be reduced in weight and provided at a low cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of a chassis frame of a truck showing a preferred embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a side view of FIG. 1;

FIG. 4 is a process explanatory diagram showing a molding process of a trunnion cross member.

FIG. 5 is a perspective view of a trunnion cross member showing another embodiment.

FIG. 6 is a perspective view of a side member showing another embodiment.

FIG. 7 is a perspective view of a conventional trunnion cross member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trunnion cross member (cross member) 2 Chassis frame 4 Flange 5 Flange 6 Half member 7 Vertical connection part 12 Suspension 29 Flange 30 Flange

Claims (2)

[Claims] 1. A cross member of a truck chassis frame having a trunnion type suspension, wherein a plate member is folded so that upper and lower flanges are respectively multiplexed to form a pair of half-members having a substantially U-shaped cross section.
A cross member wherein vertical connecting portions formed between upper and lower flanges of these half members are joined. 2. The cross member according to claim 1, wherein the flange is folded out of the half member.