JPH0215162B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a walk-behind cultivator that has a tiller rotor attached to an axle and a ground-contact drive wheel that provides resistance to the running of the machine by the rotor.

In the case of the walk-behind tiller, the ground-contacting drive wheels provide a nearly constant running resistance and maintain the running speed of the machine at a nearly constant level. Although it has the advantage of being easy to work with, conventionally, in order to drive the grounding wheel, a transmission case was provided for it, and the power was transmitted from the rotary transmission case to this transmission case (for example, (Refer to Japanese Utility Model Application Publication No. 51-2), it had the disadvantage that the structure of the transmission system was complicated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a walk-behind cultivator that can simplify the structure of the transmission system for the ground-contact drive wheels and maintain the running speed of the machine at a stable and constant speed.

A characteristic configuration of the present invention is that, in the above-mentioned walk-behind cultivator, a pair of ground-contact drive wheels are disposed near the rear of the rotor and at positions laterally and laterally outward of the machine body than the plowing marks left by the rotor. , a chain transmission mechanism is provided from the rotating shaft of the rotor to the pair of left and right ground driving wheels, and further, the chain transmission mechanism is provided between the outer end of the rotating shaft of the rotor and the inner surface of the grounding driving wheel. The function and effect are as follows.

In other words, by moving the rotor and the ground-contact drive wheel close to each other and transmitting power from the rotor shaft to the ground-contact drive wheel, it is possible to, for example, only need to wind a relatively short transmission chain between the rotor shaft and the ground-contact drive wheel. In addition, the structure of the transmission system for the ground contact drive wheel has been simplified, and it has become possible to obtain a system at a low cost that allows work to be carried out easily while maintaining the plowing depth and degree of soil crushing at approximately constant levels.

Since the ground-contact drive wheels run on uncultivated land on the side of the rotor, they can provide stable running resistance with less slip than when running on plowed land after rotor work. This also avoids the inconvenience of having the drive wheels trample over the tracks left behind. In other words, when cultivating a furrow, etc.
Since the drive wheels can be used to run in the grooves between the ridges rather than on the ridges, the running resistance can be stabilized and the work can be easily done while avoiding disturbance of the plow marks. In addition, since the ground contact drive wheels are provided on both the left and right sides of the rotor, compared to, for example, a case where one ground contact drive wheel is provided behind the transmission case equipped with the rotor and runs on uncultivated land at the bottom of the transmission case. , it is possible to suppress the left and right tilting of the machine body, stabilize the plowing posture, and easily apply running resistance stably.

Furthermore, since the transmission mechanism from the rotor to the wheels is disposed between the outer end of the rotating shaft of the rotor and the inner surface of the ground-contact drive wheel, for example, the transmission mechanism is located inside the inner end of the rotor. It is possible to avoid the situation where the rotor is located closer to the outside of the fuselage and a large amount of uncultivated land is left under the transmission case due to the transmission mechanism arrangement, as in the case where the transmission mechanism is installed.
Moreover, since the end of the rotor's rotating shaft is located within the running width of the ground-contacting drive wheel, for example, the end of the rotor's rotating shaft may be extended outward from the outer surface of the ground-contacting drive wheel, and Even when compared to the case where the transmission mechanism is disposed outside the ground-contact drive wheel, it is easier to avoid situations such as the rotor coming into contact with other objects and being damaged. In other words, if you pay attention to the ground-contact drive wheels when driving along the edge of a concrete ridge, the rotor and transmission mechanism will pass inside the ground-contact drive wheels that pass through the outermost part. Therefore, it is possible to avoid as much as possible the rotor and transmission mechanism from hitting other objects such as concrete ridges that should be avoided. Embodiments of the present invention will be described based on the drawings.

As shown in Fig. 1, the axles 2, 2 protruding left and right from the transmission case 1 are equipped with tillage rotors 3, which are capable of moving tilled soil to the outside of the machine body, in place of rubber tire wheels (not shown). It is mounted so that it can rotate integrally, and is arranged near the tilling rotor 3 in such a state that the pair of left and right ground wheels 4, 4 are driven so that the circumferential speed thereof is smaller than the circumferential speed of the tilling rotor 3. In addition to installing engine 5 in the front of the aircraft,
A walking type cultivator is provided in which a control handle 6 extends rearward from the rear of the machine body, and a ground drive wheel 4 provides resistance to the machine running by a tilling rotor 3, so that work is performed while the machine runs by the tilling rotor 3. It is configured.

In order to enable driving of each of the grounding wheels 4, a first
As shown in the figure and FIG. 2, the grounding wheel 4 is attached to an axle 8 extending from the body frame 7 so as to be relatively rotatable, and a sprocket portion 4a provided on the grounding wheel 4 and a rotating shaft 9 of the tilling rotor 3 are connected to each other. A transmission chain 10 is wound around a sprocket portion 9a provided in the rotor, so that the rotational force of the tilling rotor shaft 9 is transmitted to the grounding wheel 4.

When the engine 5 is mounted, the center of gravity of the engine 5 may be located behind the axis of the axle 2, as shown in FIG. In this case, the weight of the engine can be effectively used as a load for pressing the ground-contact drive wheel 4 onto the field so that it does not float upwards, eliminating the need for manual operation for the pressing.
There is an advantage that can be reduced.

The transmission chain 10 can be modified to have a configuration in which transmission pawls are arranged in parallel on the circumferential surface of the rotary shaft 9 so as to engage and transmit transmission to the lugs of the ground wheel 4, and these are collectively referred to as a transmission mechanism 10.

[Brief explanation of drawings]

The drawings show an embodiment of the walk-behind cultivator according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an exploded view showing the transmission system for the ground-contact drive wheels, and Fig. 3 is another embodiment of the engine mounting position. FIG. 2... Axle, 3... Tilling rotor, 4... Ground drive wheel, 9... Rotor rotation shaft, 10... Transmission mechanism.

Claims (1)

[Claims] 1 Attach the tilling rotor 3 to the axle 2, and
It is a walk-behind cultivator that is provided with a ground-contact drive wheel 4 that provides resistance to the machine's running by the rotor 3, and is located near the rear of the rotors 3, 3, and further on the machine body than the plowing marks caused by the rotors 3, 3. A pair of ground driving wheels 4, 4 are disposed at left and right lateral outer positions, and a chain transmission mechanism 10 is connected from the rotary shafts 9, 9 of the rotors 3, 3 to the pair of left and right ground driving wheels 4, 4, respectively. . Features of this walk-behind tiller.