JPH077268Y2 - Frame of dump truck for construction machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a frame of a dump truck for a construction machine.

[Conventional technology]

Dump trucks for construction machinery have front and rear wheels mounted on a frame, a cab at the front of the frame and a body at the rear, and are loaded with earth and sand for traveling and carrying. Is not only heavy,
Since the vehicle often runs on uneven terrain, a large load acts on the frame, so high strength and high rigidity are required.

On the other hand, since the dump truck for construction machinery has a large overall length, overall width, and overall height, the frame is also long and wide.

For this reason, in the conventional frame, the left and right main frames made of sheet metal are connected to each other by a plurality of cross members to facilitate the manufacture and increase the strength and rigidity.

[Problems to be solved by the device]

Such a sheet metal frame has a hollow box shape in order to increase the strength and rigidity of the long left and right main frames, so four long plates must be welded at the four corners. The welding work becomes very troublesome, and stress concentrates on the welded portion, which easily causes damage or cracks, resulting in poor reliability.

Then, this invention is providing the frame of the dump truck for construction machines which was able to solve the above-mentioned subject.

[Means and Actions for Solving the Problems]

A frame where front wheel load, rear wheel load and body weight are made of cast steel, and other straight parts are made of sheet metal.
As a result, strength and rigidity can be increased, and manufacturing can be facilitated.

〔Example〕

As shown in FIG. 1, a front cross member 1, left and right front cross members 2,2 a rectangular frame-shaped middle cross member 3, left and right middle cross members 4,4, left and right rear cross members 5 , 5 rear cross members 6 and lower cross members 7, the front cross member 2 is a hollow box-shaped sheet metal, and the front part is a sheet metal front cross member 1.
While being butt welded to each other, the middle cross member 3 is composed of left and right frame members 8 and 8 made of cast steel, a hollow box-shaped lower connecting member 9 and an upper connecting member 10 made of sheet metal, The frame member 8 includes a front protrusion 11, a rear protrusion 12, and a lower inward protrusion.
13, a lower frame member 15 having an upward projecting portion 14, a downward projecting portion 16 facing the upward projecting portion 14, and an upper frame member 18 having an upper inward projecting portion 17, Upward protrusion
14 and the downward protruding portion 16 are welded, and the left and right lower frame members 1
The lower connecting member 9 is welded between the lower inward projecting portions 13, 13 of 5,15, and the upper connecting member 10 is welded between the upper inward projecting portions 17,17 of the left and right upper frame members 18,18. is there.

Then, the rear parts of the left and right front cross members 2, 2 are welded to the left and right front protruding parts 11, 11.

The middle transverse member 4 is made of a sheet metal in the shape of a hollow box, the front portion of which is welded to the rearward protruding portion 12, and the rear transverse member 5 has a plate-like shape with the same width as the middle transverse member 4. It is made of cast steel and is welded to the rear part of the intermediate cross member 4.

The rear cross member 6 is made of a hollow metal plate,
The left and right rear cross members 5, 5 are welded together.

The lower cross member 7 comprises left and right vertical members 19, 19 and a connecting member 20. The vertical member 19 is made of cast steel and is welded to the lower portion of the intermediate cross member 4, and the connecting member 20 is made of a hollow sheet metal. The left and right vertical members 19, 19 are welded to each other, and the front horizontal member 2, the lower frame member 15, the intermediate horizontal member 4, and the rear horizontal member 5 constitute the left and right main frames.

Further, a bracket 21 for mounting a link that supports a front wheel is formed in the lower portion of the left and right lower frame members 15, and a bracket for mounting a front suspension cylinder is mounted on the upper frame member 18.
22 is integrally formed so that the front wheel load acts on the frame member 8, and the left and right vertical members 19 are integrally formed with the hoist cylinder mounting pin 23 and the link mounting bracket 24 for supporting the rear wheel. A part of the vessel load and a part of the rear wheel load act on the vertical member 19, and a bracket 25 for mounting the vessel and a bracket for mounting the rear suspension cylinder supporting the rear wheel are mounted on the rear cross member 5. 26 is integrally formed so that a part of the vessel load and a part of the rear wheel load act on the rear cross member 5, and further, the vessel support base 27 and the driver's cab mounting for the left and right upper frame members 18 The bracket 28 is provided so that a part of the vessel load and a part of the cab weight act on the upper frame member 18.

In this way, in the frame that connects the left and right main frames with multiple cross members, the parts on which the front wheel load, rear wheel load, and vessel load act are made of cast steel, the other straight parts are made of sheet metal, and the other straight parts Since is made of sheet metal, the compulsory / rigidity can be sufficiently increased and the manufacturing becomes easy.

Both end surfaces 4a, 4a of the intermediate transverse member 4 are parallel surfaces inclined to the vertical, and the end face 12a of the rearward protruding portion 12 and the front end surface 5a of the rear transverse member 5 are also parallel surfaces inclined to the vertical. In addition, as shown in FIG. 5, the end surface 12a of the rearward projecting portion 12 is finished and the backup material 30 welded to the lower surface of the intermediate member 4 of the end surface 12a is butted, and the end surfaces are welded to each other. And the weld is parallel to the vertical. In addition, the rear end surface of the front cross member 2 and the forward protruding portion
The end faces of 11 are also welded in the same manner.

Because of this, the welded portion is less likely to be displaced.

[Effect of device]

The cross member 8 on which the front wheel load acts, the rear wheel load, the rear cross member 5 on which the vessel weight acts, and the vertical member 19 are made of cast steel, and other straight front cross members 2 and intermediate cross members 4, Since the front cross member 1, the rear cross member 6 and the like are made of sheet metal, the strength and rigidity can be improved and the manufacturing can be facilitated. Moreover, since a large load does not act on the sheet metal part, stress is applied to the welded portion. Reliability is improved without being damaged or cracked even when concentrated.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is an external perspective view of a frame, FIG. 2, FIG. 3, FIG. 4 and FIG. 5 are front views, plan views, front views, rear views of the frame, FIG. 6 is a sectional view of the welded portion. 1 is a front cross member, 2 is a front cross member, 3 is a middle cross member, 4 is a middle cross member, 5 is a rear cross member, 6 is a rear cross member, 7 is a lower cross member, and 8 is a vertical member. , 9 is a lower connecting member, 10 is an upper connecting member, 19 is a vertical member, 20
Is a connecting material, 21,22,24,25,26 are brackets, and 23 is a pin.

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right frame members 8 made of cast steel are connected by a hollow cast steel lower connecting member 9 and a sheet metal upper connecting member 10 to form a rectangular frame-shaped intermediate cross member 3. The left and right front transverse members 2,2 and the left and right intermediate transverse members 4,4 that are hollow shapes made of sheet metal are welded to the lower front and lower rear of the left and right frame members 8,8, and The front cross members 2,2 are connected by a front cross member 1 made of sheet metal, the rear cross members 5,5 made of cast steel are welded to the rear parts of the left and right middle cross members 4,4, and left and right rear parts The rear cross member 6 made of sheet metal is welded between the cross members 5,5, the left and right vertical members 19,19 made of cast steel are welded to the lower part of the intermediate contact member 4, and the left and right vertical members 19,19 are provided between them. A bracket for attaching a front wheel supporting link is attached to the left and right frame members 8 by welding a connecting member 20 made of sheet metal to form a lower cross member 7.
21, bracket for mounting the suspension cylinder 22
And a bracket 25 for mounting a vessel and a bracket 26 for mounting a rear suspension cylinder are integrally formed on the rear cross member 5, and a pin 23 for mounting a hoist cylinder and a rear wheel support link are mounted on the vertical member 19. bracket
A frame for a dump truck for construction machinery, which is provided with 24 integrally.