JPH08169366A - Articulate mode dump body - Google Patents

Abstract

PURPOSE: To shorten turning radius by providing a transverse mechanism floating up a third axis wheel from the ground. CONSTITUTION: A second axis wheel 2 and a third axis wheel 3 are linked with each other through a walking beam suspension 4, and the walking beam suspension 4 is floated up on the third axis wheel 3 side by means of a transverse mechanism 6 consisting of a hydraulic cylinder 5. Consequently, at ordinary running when the transverse mechanism 6 does not act, a two-way valve 7 is set in the state (b) in which the hydraulic cylinder 5 moves freely, meanwhile, at turning when the transverse mechanism 6 acts, the two-way valve 7 is set in the state (a) in which the hydraulic cylinder 5 is contracted so as to float up the third axis wheel from the ground and shorten the turning radius. When the third axis wheel 3 is brought down after completion of turning, return oil from the hydraulic cylinder 5 is restricted by means of a restrictor 8, so that the wheel does not suddenly fall on the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an articulate type dump.

[0002]

2. Description of the Related Art Dumps used in civil engineering work sites are required to have a large load capacity and a small turning radius. However, in order to increase the load capacity, it is necessary to increase the size of the vehicle body, and in order to reduce the wheel load, it is necessary to increase the number of wheel axles, resulting in a large turning radius.

Therefore, at present, a vehicle of such a purpose is used with an articulate type dump to reduce the turning radius, but there is a limit to the reduction with this type.

[0004]

Although the articulate type dump is advantageous in reducing the turning radius,
The center of the turning radius in this method is the first as shown in FIG.
This is the intersection A between the axis a of the axle wheel 1 and the intermediate axis b of the second axle wheel 2 and the third axle wheel 3, and there is a limit to the reduction of the turning radius in this method.

The present invention has been made in view of the above circumstances, and an object thereof is to further reduce the turning radius.

[0006]

The structure of the present invention for achieving the above object is an articulate type dump truck having a first axle wheel, a second axle wheel, and a third axle wheel. A transverse mechanism for lifting the third axle wheel above the ground is provided.

[0007]

According to the present invention, since the third axle wheel is floated from the ground by the transverse mechanism during turning by the above means, the turning center is independent of the third axle wheel and the axis of the first axle wheel and the second axle wheel. It becomes an intersection with the axis of the wheel, and the turning radius is much smaller than that of a normal articulate dump.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings, in which 10 denotes an articulate type dump truck, and the dump truck 10 has a first axle wheel 1 and a second axle wheel 2 as shown in FIG. And a third axle wheel 3, and the third axle wheel 3 is provided so as to be able to float above the ground as shown in FIG.

More specifically, as shown in FIG. 3, the second axle wheel 2 and the third axle wheel 3 are linked by a walking beam suspension 4, and the walking beam suspension 4 is connected to the third axle wheel 3. Transverse mechanism 6 consisting of hydraulic cylinder 5 to float this side
Installed. The hydraulic cylinder 5 is connected to the pump P and the tank T via the two-way valve 7 as shown in FIG.
A throttle valve 8 is provided in the return circuit, and oil from the hydraulic pump P is sent to the hydraulic cylinder 5 when the two-way valve 7 is in one switching state a, and oil from the hydraulic pump P is in the other switching state b. 5, the hydraulic cylinder 5 is allowed to move freely, and the return oil of the hydraulic cylinder 5 is throttled by the throttle valve 8. Therefore, in normal traveling, that is, when the transverse mechanism 6 does not work, the two-way valve 7 is kept in the state of b, that is, the hydraulic cylinder 5 is freely moved so that the operation of the walking beam suspension 4 is not hindered, and When turning, that is, the transverse mechanism 6
When the two-way valve 7 is in the state of "a", the hydraulic cylinder 5 is contracted to float the third axle wheel above the ground to reduce the turning radius, and the third axle wheel 3 is lowered after the turning is completed. The two-way valve 7 is set to the state of b to make the hydraulic cylinder 5 free, but the return oil is throttled from the hydraulic cylinder 5 by the throttle valve 8 so that the wheels do not drop suddenly on the ground.

FIG. 5 is a model view of the above walking beam suspension. FIG. 6 shows another embodiment of the present invention. The second axle wheel 2 and the third axle wheel 3 are respectively supported by hydraulic suspensions 9, and each hydraulic suspension 9 is located on the third axle wheel 3 side. It is a transversal mechanism 6 of a hydroflex mechanism which is interlocked with each other to float.

[0011]

As described above, according to the present invention, in the articulate type dump truck having the first axle wheel, the second axle wheel and the third axle wheel, the transverse mechanism for floating the third axle wheel from the ground is provided. Since the third axis wheel is floated from the ground when the vehicle turns, the turning center is the intersection of the axis line of the first axis wheel and the axis line of the second axis wheel, and the turning radius is the normal articulation. It has the effect of being considerably smaller than the dump of the late type.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view showing a floating state of a third axle wheel in FIG.

FIG. 3 is a rear side view of FIG.

FIG. 4 is a hydraulic circuit diagram of the cylinder in FIG.

FIG. 5 is a model diagram of a walking beam suspension.

FIG. 6 is a model view of a hydroflex mechanism.

FIG. 7 is an explanatory view showing a turning center of a conventional example.

[Explanation of symbols]

 1 1st axle wheel 2 2nd axle wheel 3 3rd axle wheel 6 Transverse mechanism 10 Dump

Claims (1)

[Claims] 1. An articulate type dump truck having a first axle wheel, a second axle wheel and a third axle wheel, wherein:
An articulate type dump comprising a transverse mechanism for floating the third axle wheel above the ground.