JPH0124216Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a self-leveling mechanism of a bucket in a shovel loader or a tractor shovel (hereinafter referred to as a "loader"), and more specifically, in a case where a lift arm is rotated upward.
This invention relates to a self-leveling mechanism that is provided so that a bucket that is pivotally connected to the tip of the lift arm can be controlled so that it is always in a horizontal position.

Prior Art In general, in the case of a loader, soil, etc. is scooped up using a bucket that is pivotally connected to the tip of the lift arm, and the bucket is lifted to an appropriate height using a lift cylinder, and dumped at the lifted position. The system is designed to discharge dirt, etc. inside the bucket by tilting the bucket with a cylinder, but if the bucket is directly connected to the lift arm, it will cause problems during lifting operations. This results in a problem in that the bucket, which is pivotally connected to the tip of the lift arm, cannot be maintained in a horizontal position as the lift arm rises. That is, as the lifting angle of the lift arm changes, the bucket gradually becomes tilted backwards, resulting in a problem in which some of the dirt, etc. spills out of the bucket.

Conventionally, the above-mentioned problems can be solved by automatically correcting the installation angle of the bucket that is pivotally connected to the tip of the lift arm in response to changes in the lifting angle of the lift arm. A method (self-leveling mechanism) has been proposed that allows the bucket to be held in a horizontal position at all times, but while the conventional self-leveling mechanism provides a self-leveling effect, it significantly impairs workability. There is a problem in that it is

That is, as shown in Fig. 2, the above proposal consists of a link mechanism with four sections including a portion near the base of the lift arm a, a connecting rod b, a pillar c, and a counter arm d, a portion near the tip of the lift arm a, and a dump cylinder e. , counter arm d, bucket g
The mounting bracket f constitutes a link mechanism with four sections, and both link mechanisms are provided so as to obtain a self-leveling effect.However, while the self-leveling effect can be obtained in the same proposal, the structure of the link mechanism This results in a new problem in that the lifting stroke of the upper lift arm and the tilting stroke of the bucket are restricted, impairing workability.

Purpose of the invention The present invention is an attempt to improve the conventional situation as described above, and the purpose of the present invention is to provide a self-leveling mechanism with excellent workability.

Structure of the invention In other words, the present invention not only provides effective self-leveling with a simple mechanism, but also allows for sufficient lifting and lowering stroke of the lift arm, and allows the bucket to be tilted over a 360 degree angle. The gist of the present invention is that an idle sprocket wheel, which has multiple wheel parts at the base and middle part of the lift arm, is mounted on a shaft, and the tip part has a A sprocket wheel is provided so as to be able to rotate together with the bucket cart, a hydraulic motor equipped with a sprocket wheel is provided in the main body, and each sprocket is connected by a chain.

Embodiments Specific embodiments of the present invention will be described below with reference to illustrative drawings. In the drawing shown in Figure 1, 1
2 is a main body of the loader, and 2 is a pillar that rises upward from the rear end of the main body 1. A lift arm 4 is pivotally connected to the upper end of the pillar 2 via a fulcrum shaft 3. Ru. More specifically, the fulcrum shaft 3 is fixed to the pillar 2 side, and the fulcrum shaft 3 is equipped with a two-stage sprocket wheel, that is, a plurality of wheel parts 9a,
A sprocket wheel 9 having a sprocket wheel 9b is rotatably mounted on the shaft. The lift arm 4 is bent into a substantially U-shape through a bending portion 5 so that a portion near the front end thereof extends obliquely forward and downward. The lift arm 4 is provided so as to be rotatable up and down via a lift cylinder 7 extending between a bending part 5 and the base of the pillar 2, and a two-stage sprocket is attached to the bending part 5 via a support shaft 10. A wheel, that is, a sprocket wheel 11 having a plurality of wheel portions 11a and 11b is mounted on an axis so as to be freely rotatable. A bucket bag 8 is pivotally connected to the tip of the lift arm 4 via a support shaft 6. More specifically, the support shaft 6 is fixed to the bucket belt 8 side. A sprocket wheel 12 is fixed to the support shaft 6. That is, the sprocket wheel 9, the support shaft 6, and the bucket belt 8 are integrally provided so that they can rotate together.

On the other hand, a hydraulic motor 13 is provided on the pillar 2, and a chain 16 is stretched between a sprocket wheel 15 mounted on a drive shaft 14 of the hydraulic motor 13 and one wheel portion 9a of the sprocket wheel 9. Ru. A chain 17 is provided between the other wheel portion 9b of the sprocket wheel 9 and the other wheel portion 11a of the sprocket wheel 11.
A chain 18 is stretched between the other wheel portion 11b of the sprocket wheel 12 and the sprocket wheel 12, respectively.

In the above embodiment, the two-stage sprocket wheel 9, the two-stage sprocket wheel 11, and the sprocket wheel 12 are formed to have the same diameter, but the diameter of each sprocket wheel is the same as in the above embodiment. It is not limited. That is, although not shown in the drawings, in addition to the above embodiment, the sprocket wheel 1 is
2 can be formed with a slightly larger diameter,
It is also possible to form the sprocket wheel 9b with a slightly smaller diameter than the sprocket wheel 11a. By forming the sprocket wheel 9b or 12 with a different diameter from the sprocket wheel 11 as described above, it is possible to change the forward inclination angle of the bucket belt 8. That is, the forward tilt angle can be reduced.

Next, its effect will be explained.

FIG. 1 is a diagram showing a state in which the bucket 8 is lowered so that its opening faces toward the front, and by moving the main body 1 forward with the bucket 8 lowered in this way, the dirt can be removed. The effect of scooping up the materials into the bucket 8 can be obtained. Then, by driving the hydraulic motor 13 clockwise in the state shown in FIG.
4. Transmitted to the support shaft 6 via the sprocket wheel 15, chain 16, two-stage sprocket wheel 9, chain 17, two-stage sprocket wheel 11, chain 18, and sprocket wheel 12, and tilts the bucket 8 backward. (clockwise) rotation effect can be obtained. Then, after stopping the drive of the hydraulic motor 13 while the bucket 8 has rotated to a horizontal state (a state with the opening facing upward), the lift cylinder 7 is operated in the direction of extension, so that the lift arm 4 is An effect of rotating upward can be obtained. In other words, the lifting action of the bucket belt 8 can be obtained, but between the two-stage sprocket wheels 9 and 11 that tension the chain 17, the second-stage sprocket wheel 9 on the pillar 2 side has the hydraulic motor 13 in a stopped state. By being in a fixed state, the two-stage sprocket wheel 1 on the bending part 5 side
1 has the effect of rotating in the direction of the arrow with the two-stage sprocket wheel 9 as a fulcrum as the lift arm 4 rotates upward. As the two-stage sprocket wheel 11 rotates in the direction of the arrow in this manner, one wheel portion 11b of the two-stage sprocket wheel 11 rotates.
The chain 18 and the sprocket wheel 12, which are stretched across the bucket, are rotated in the direction of the arrow, and the bucket cart 8 is rotated from a horizontal state toward a forward tilt direction. Immediately, the lift arm 4 rotates about the fulcrum shaft 3 and rises, so that the bucket cart 8, which was set in a horizontal state in the lowered position, gradually becomes tilted backward as the lift arm 4 rises. However, in this way, the amount of backward tilting is offset by the rotation of the bucket bag 8 in the forward tilting direction, and the horizontal state can be maintained. That is, a self-leveling effect can be obtained.

Then, by driving the hydraulic motor 13 counterclockwise with the bucket 8 lifted to an arbitrary height position, the driving force is applied to the drive shaft 14, sprocket wheel 15, and chain 1.
6, two-stage sprocket wheel 9, chain 17,
It is transmitted to the support shaft 6 via the two-stage sprocket wheel 11, the chain 18, and the sprocket wheel 12, and the bucket cart 8 can be tilted forward. In the present invention, by continuing to drive the hydraulic motor 13, it is possible to rotate the bucket 8 over a 360 degree angle, and the rotation over a 360 degree angle can be repeated two or more times continuously. It is also possible.

In addition, when the load on the bucket cart 8 is large, the center of gravity of the main body part 1 may shift rearward during the lifting operation of the bucket cart 8, causing the bucket cart 8 to tilt backward. Sprocket wheel 1 as described in the embodiment
This can be achieved by changing the diameter of the two or two-stage sprocket wheel 9 and adjusting its forward inclination angle.

Effects The present invention is constructed as described above, and
By configuring as described above, a self-leveling mechanism can be obtained with an extremely simple structure consisting only of a hydraulic motor and a sprocket wheel and chain for transmitting the driving force of the hydraulic motor, and is also effective. It has now become possible to obtain a self-leveling effect.

In particular, in the case of the present invention, by having the above-mentioned configuration, the bucket can be lifted to any desired height without restricting the lifting angle of the lift arm. By being able to rotate it, it has become possible to improve the effect of separating earth and sand during dumping. In other words, the dumping effect can be enhanced,
It has now become possible to improve the workability.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing a loader equipped with a self-leveling mechanism according to the present invention, and FIG. 2 is a side view showing a conventional structure. 1... Main body, 2... Pillar, 3... Fulcrum shaft,
4... Lift arm, 5... Bent part, 6... Support shaft, 7... Lift cylinder, 8... Bucket,
9...Two-stage sprocket wheel, 9a, 9b...
...Wheel part, 10... Support shaft, 11... Two-stage sprocket wheel, 11a, 11b... Wheel part, 12... Sprocket wheel, 13... Hydraulic motor, 14... Drive shaft, 15... Sprocket Tsuto wheel, 16, 17, 18... chain.

Claims (1)

[Claims for Utility Model Registration] (1) A loader in which the base of a lift arm is pivotally connected to the main body so that it can rotate freely in the vertical direction, and a bucket is pivotally connected to the tip of the lift arm so that it can tilt forward and backward. An idle sprocket wheel having a plurality of wheel parts is mounted on a shaft at the base and middle part of the lift arm, and a sprocket wheel is mounted on a shaft at the tip part so that it can rotate together with the bucket belt. is a self-contained bucket belt in a loader equipped with a hydraulic motor, and a chain stretched between a sprocket wheel mounted on the hydraulic motor, an idle sprocket wheel mounted on the base of the lift arm, and between each of the above sprocket wheels. Leveling mechanism. (2) A self-leveling mechanism for a bucket belt in a loader, in which a sprocket wheel mounted on the tip of a lift arm is formed to have a larger diameter than an idle sprocket wheel mounted on an intermediate portion. (3) A self-leveling mechanism for a bucket belt in a loader, in which an idle sprocket wheel mounted on the base of a lift arm is formed to have a smaller diameter than an idle sprocket wheel mounted on an intermediate portion.