JPS5921806B2 - mobile agricultural machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is mainly designed to perform work (mainly tilling) with a dog load rather than a running load, like a walk-behind tiller, and to drive a working device to a traveling mission case with an axle mounted on the shaft. The present invention relates to a mobile agricultural machine in which a working power extraction shaft for transmitting force is provided at a position on the upper side of the transmission side than the axle.

In the above-mentioned mobile agricultural machinery, a working power extraction shaft is provided in the middle of the transmission system to the axle, and the axle and the working power extraction shaft are connected, and the axle can also be set for the working equipment. There is a possibility that high torque can be transmitted.

On the other hand, the running load due to wheel rolling on the axle is normally low compared to the working load, but an extremely high load may unexpectedly occur.If an excessive running load occurs in this way,
The high torque is transmitted to the axle connected to the work power extraction shaft, and an external force is generated against the axle bearing.

Therefore, the circumference of the axle bearing portion, which normally requires relatively little strength, has had to be constructed to be strong in preparation for the above-mentioned unforeseen circumstances.

The present invention focuses on the fact that the occurrence of excessive running load is extremely rare, and in abnormal cases where excessive running load occurs, even if the running is stopped, the overall work will not be significantly prevented. By selecting the capacity and rationally setting the location of the safety clutch that stops the vehicle, the structure around the axle bearing can be made lighter and smaller, which is advantageous in manufacturing the travel transmission case. Moreover, the aim is to provide a mobile agricultural machine that can also ensure the safety of workers.

Embodiments of the present invention will be described in detail below based on illustrative drawings.

Figure 1 shows a walk-behind tiller as an example of a mobile agricultural machine, and the driving force is transmitted or not transmitted by either the driving force of the engine E mounted at the front of the machine or by tensioning and relaxing the belt of the belt transmission device 1. It is transmitted to the input part of the traveling mission case 3 through a tension clutch (power transmission clutch) 2 that is switched to drive the propulsion wheels 5, 5 attached to the axle 4 whose bearings are held in the lower part of the mission case 3. A working power extraction shaft 6 is supported by a bearing and protrudes from the mission case 3 at a position above the axle 4, and is connected to a working device connecting portion 7 provided at the rear of the mission case 3. A device (work device) 8 is configured to be operatively connected to the power take-off shaft 6.

A clutch shaft 9 is provided in the transmission case 3 at a position lower than the power take-off shaft 6 and higher than the axle 4. A clutch gear 11 is biased by a spring 13 via a shifter 12 so as to be slidably movable only in the axial direction so as to mesh with the side meshing portion 10a of the rotating gear 10.

A shifter shaft 14 is connected to the shifter 12, and the driving safety clutch A is held by a bearing in order to move in and out of the transmission case 3 in conjunction with the movement of the shifter 12.
has been configured.

Further, the shifter shaft 14 prevents the swinging arm 1b, which is tensioning the bell (Ia) of the belt transmission device 1, from returning in the direction of the biasing force of the spring 1c against the spring 13.

The shifter shaft 14 is configured to be able to be moved in and out at the control section, and the tension clutch 2 can be disengaged by tightening the bell Ha.

Furthermore, as shown in FIG. 5, a slope 14a is formed at the tip of the shifter shaft 14, and in a protruding and biased state, the swinging arm 1b is forced to swing toward the belt tension side by manual operation. At times, this swinging arm 1b
4a, the shifter shaft 14 is retired, and then, after passing the shifter shaft 140, it projects again to prevent the swinging arm 1b from returning, and the safety clutch 2 is set.

In the figure, reference numeral 15 denotes a multi-plate main clutch, which is installed on the input shaft 16 of the traveling transmission case 3, and is configured so that important operations can be performed by operating a clutch lever 18 installed in the control bundle 17. It's broken.

According to such a configuration, a walking operator holds the steering handle 17 and plows the clay using the rotary tiller 8 while moving the machine forward using the force of the propulsion wheels 5. When the aircraft enters the soil, the running resistance (
When the load (load) increases above a certain level, the safety clutch A disengages and the aircraft stops, and the tension clutch 2 disengages, cutting off the transmission of driving force from the engine E, and the tilling device 8 also automatically stops. It will be done.

Incidentally, as shown in FIG. 6, the friction type multi-disc clutch (main clutch) 15 itself may be configured to be disengaged in conjunction with the traveling safety clutch A.

In this configuration, the shifter shaft 14 of the safety clutch A is
It is preferable that the clutch lever 18 of the control bundle 17 be linked with the control wire 19.

In summary, the first invention provides the mobile agricultural machine described above, in which the driving force transmission state is automatically interrupted at a position below the working power extraction shaft and above the axle when a load is smaller than the load of the working device. It is characterized by being equipped with a safety clutch that can be dropped.

In other words, a safety clutch that can be disengaged with a load smaller than the working load is placed on the lower side of the operating power output shaft.
Since the safety clutch disengages with a running load that is smaller than the working load, and no heavy load is applied to the axle, the axle bearing part of the transmission case does not need to be particularly strong, and this part can be made lighter. It was possible to reduce the size, which was advantageous in manufacturing the transmission case.

Moreover, in the second invention, in addition to the first invention, the power transmission clutch provided at a position above the transmission case is configured to be disengaged in conjunction with the disengagement operation of the safety clutch. It is characterized by

In other words, the drive to the transmission case is cut off in conjunction with the operation of the safety clutch, which is cut off when the load is smaller than the work load, so when the traveling device stops, the working device also automatically stops.

Therefore, by driving the working equipment while the machine is stopped, it is possible to reliably prevent the risk of unexpected accidents.
It has also become possible to improve safety for workers.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the mobile agricultural machine according to the present invention, in which Fig. 1 is a side view of the cultivator, Fig. 2 is a drive system diagram, Fig. 3 is a sectional view of main parts, and Figs. 4 and 5 are main parts. Fig. 6 is a side view of another embodiment.02...Power transmission clutch, 3...Traveling transmission, 4...Axle, 6... ...Working power extraction shaft, 8...Working device, A...Safety clutch.

Claims (1)

[Scope of Claims] 1. A working power extraction shaft 6 for transmitting driving force to a working device 8 is provided in a traveling transmission case 3 on which an axle 4 is mounted at a position on the upper side of the transmission side than the axle 4, and this working power extraction shaft axis 6
The working device 8 is located on the lower side of the wheel and on the upper side of the axle 4.
A mobile agricultural machine characterized in that it is provided with a safety clutch A that automatically disconnects the driving force transmission state at a load smaller than the load. 2. A working power extraction shaft 6 for transmitting driving force to the working device 8 to the traveling mission 3 mounted on the axle 4 is provided at a position above the axle 4, and a working power extraction shaft 6 is provided at a position on the lower side of the working power extraction shaft 6 and the axle 4 is provided with a safety clutch A that can be dynamically disconnected under a load smaller than the load of the working device 8, and in conjunction with the disconnection operation of the safety clutch A, the transmission A mobile agricultural machine characterized by being configured to disconnect a power transmission clutch 2 provided at a position above a case 3.