JPS5945530B2 - Tilt device for cargo boxes in dump trucks - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cargo box tilting device for a dump vehicle, which includes a front cylinder and a rear cylinder arranged oppositely.

Generally, the cargo box in a dump vehicle is tiltably supported by a subframe provided on the chassis frame. Conventionally, there are two types of tilting methods: a true type in which a undulating cylinder is directly connected between the cargo box and the subframe, and a There is also a link combination type in which a link is provided between the box subframes and a telescopic cylinder is connected to this link.

In the former true type, since the hoisting cylinder is lying down at the beginning of tilting the cargo box, the component force acting in the direction of raising the cargo box is small, and a large output is required, and the hoisting cylinder must be made larger. Moreover, when the cargo box is in a tilted state, it is supported by a single undulation cylinder, which makes it vulnerable to lateral vibration and unstable.

In addition, the latter combination type with links has a lower initial output and is more resistant to lateral vibration, but one set is 100-
Since links weighing 150 yen are provided on both sides, the total weight increases, which affects the loading capacity, etc.
Undesirable.

Furthermore, in the above-mentioned true type, it is possible to reduce the initial output of each cylinder by providing two telescoping cylinders facing each other, but the front telescoping cylinder requires a large amount of expansion and contraction, making it difficult to prevent lateral vibration. However, it is weak and unstable.

In view of these points, the present invention provides a dump truck in which a front cylinder and a rear cylinder are mounted facing each other, and the front part of a subframe is provided to be able to be raised and lowered, so that the front subframe stands up when a cargo box is tilted. To provide a tilting device for a cargo box in an automobile, which is strong and stable against lateral vibration like the link combination type, and lightweight like the true type, and eliminates the above-mentioned conventional drawbacks.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below based on embodiments with reference to the drawings.

In Fig. 1, 1 is the chassis frame of a dump vehicle;
2 is a subframe provided on the chassis frame 1;
3 is a packing box.

The subframe 2 is divided into two front subframes and a rear subframe 2B, and the rear subframe 2B is fixed to the chassis frame 1 with lashing fittings 4 and coupling fittings 5, and is attached to the front end of the rear subframe 2B. is front subframe 2
The rear ends of the people are rotatably connected by a connecting shaft 6, and the two front subframes are supported on the chassis frame 1 so as to be able to rise and fall about the connecting shaft 6.

Further, a hinge 7 of the cargo box 3 is supported by a dump shaft 8 so as to be tiltable at the rear end of the rear subframe 2B.

Chassis frame 1 is attached to the lower surface of the front end of front subframe 2A.
A contact rubber 9 that contacts the upper surface is provided, a reinforcing frame 10 is provided on the inside, and both subframes 2A, 2B are provided.
A receiver 12 is provided on the upper surface of the box 3 and comes into contact with the lower surface of the main girder 11 of the cargo box 3.

On the other hand, a front cylinder 13 is connected between the front subframe 2A and the cargo box 3, and a rear cylinder 14 is connected between the rear subframe 2B and the cargo box 3.

A piston type cylinder is used as the rear cylinder 14, and a base 14a connected to the lower end connects to the rear subframes 2B on both sides.
is swingably supported on a support shaft 15, and the tip 14b of the iron 16 is connected to a fixed shaft 17 on the lower surface of the cargo box 3.

The front cylinder 13 is a large-diameter ram-shaped cylinder, and ribs 19 are attached to both sides of the lower part of the cylinder tube 18.
The lower end 13a is swingably supported by a support shaft 20, and the tip 13b of the plunger 21 is supported by the fixed shaft 17 of the cargo box 3 together with the tip 14b of the rear cylinder 14.

The front end 13b of the front cylinder 13 is provided so as to narrow the front end 14b of the rear cylinder 14 from both sides, and is connected to the same fixed shaft 17.

Note that 22 is the rear wheel of the dump vehicle.

To explain the tilting operation of the cargo box 3, when hydraulic pressure is supplied to the front cylinder 13 and the rear cylinder 14 in the horizontal state of the cargo box 3 as shown by the solid line in FIG. 2, both cylinders 13.
14 is extended, and the cargo box 3 is rotated upward around the dump shaft 8 due to the upward combined force of the output.

At this time, the amount of extension of the front cylinder 13 is greater than the amount of extension of the rear cylinder 14, and when the front cylinder 13 reaches the maximum amount of extension as shown by the chain line in FIG.
4, a force acts on the front cylinder 13 in the lifting direction, and as shown in FIG. 3, the front subframe 2A
rotates upward and stands up, the front cylinder 13 moves upward at the maximum extension amount, the rear cylinder 14 extends to a substantially upright state, and then, when the cylinder 14 extends to the maximum, the cargo box 3 also tilts to the maximum. It becomes an angle.

This movement from the tilted state to the horizontal state is the opposite of the above, in which the front subframe 2A is tilted forward from the upright state by shortening the rear cylinder 14, and then both cylinders 13 and 14 are shortened to make the cargo box 3 horizontal. state.

Therefore, according to the device of the present invention as described above, the subframe is divided into front and rear parts, the front subframe is provided to be able to rise and fall, and the front cylinder is placed between the front subframe and the cargo box.
A rear cylinder is provided in opposition between the rear subframe and the cargo box, and because the front subframe stands up when the cargo box is tilted, the amount of extension of the front cylinder can be shortened, making the front cylinder more compact. can be achieved.

Furthermore, when a force in the direction of lateral vibration is applied to the cargo box, in order to support this lateral vibration with the upright front subframe, it is strong against lateral vibration, like a tilting device that uses links. This improves stability.

Moreover, since this front subframe can be used as is by dividing the previously installed subframe, it is possible to minimize the increase in weight and reduce the total weight to the same as that of the true type.

Furthermore, if a large-diameter ram-shaped cylinder is used as the front cylinder as in the embodiment, the inclination between the plunger and the cylinder tube will be small, and the cylinder will be more resistant to lateral vibration.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of the device in a tilted state, and FIGS. 2 and 3 are sectional views each showing the tilting operation.

Claims (1)

[Claims] 1. In a dump vehicle, a subframe is provided on a chassis frame, a cargo box is connected to the subframe in a tiltable manner, and a front cylinder and a rear cylinder are mounted facing each other between the cargo box and the subframe. is divided into a front subframe and a rear subframe, the rear subframe is fixed to the chassis frame, the front subframe is connected to the front end of the rear subframe so that it can be raised and lowered, and the front cylinder is connected to the cargo box and the front part. A cargo box tilting device for a dump vehicle, characterized in that the rear cylinder is connected between the subframes, the rear cylinder is connected between the cargo box and the rear subframe, and the front subframe stands up when the cargo box is tilted. Front cylinder A tilting device for a cargo box in a dump vehicle according to claim 1, which uses a large-diameter ram-shaped cylinder.