JPH0160201B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a relatively small-sized rotary tiller having claw shafts protruding from the left and right sides of the lower end of a rotary case.

Generally, the rotary tilling device with the above structure is used by being attached to the traveling machine body, and various tilling claws and rotary attachments are attached to the left and right claw shafts to perform various rotary works, depending on the type of work. In the past, highly efficient operation was not possible. For example, when lifting soil between furrows and supplying the soil to the furrows, or discharging soil to the side such as digging trenches, by rotating an attachment attached to a horizontal claw shaft, It has been difficult to obtain a sufficient lateral soil blowing function, especially in small rotary tillers with relatively low output.

By improving the transmission structure of the rotary case and the pawl shaft, the present invention is a versatile machine that can efficiently perform not only normal tillage work but also work that requires sideways splashing of soil. The purpose is to provide a high-performance rotary tillage device.

A feature of the present invention is that a rotary case with left and right claw shafts protruding from the lower end is configured to be rotatable by more than 90 degrees around the vertical axis, and is used in a position where both claw shafts face forward and backward. In addition to configuring the
A rotational direction switching mechanism is provided for switching between a state in which both the pawl shafts are rotationally driven in the same direction and a state in which they are rotationally driven in mutually opposite directions.The functions and effects thereof are as follows.

In other words, for soil lifting work, by rotating the rotary case 90 degrees and directing the axis of rotation of the claw shaft toward the front and back of the machine, the soil is thrown up in the direction of rotation of the claw, making it highly efficient. Even with a low-output engine, a strong scattering force can be obtained and it can handle wide ridges.In this case, by reversing the rotation direction of the front and rear claws, the left and right sides of the aircraft can be Furrows can be raised simultaneously in both directions, and the reaction forces of the front and rear claws cancel each other out, which prevents the aircraft from meandering and improves maneuverability.

In addition, by rotating the rotary case 180 degrees around the vertical axis and orienting the axis of rotation of the pawl shaft in the lateral direction of the aircraft, it is possible to easily switch between so-called down cut and up cut, and the conventional transmission structure can be left almost unchanged. I was able to make it usable.

Furthermore, by rotating the rotary case around the vertical axis at an appropriate angle, it has become possible to plow various widths and perform tasks such as digging trenches.

In short, by changing the orientation of the rotary case and switching the drive of the pawl shaft, a highly versatile rotary tiller can be constructed that can perform various types of work with appropriate drive modes.

Next, embodiments of the present invention will be described based on the drawings.

Figure 1 shows the overall side view of a control machine equipped with a rotary tiller according to the present invention, with an engine 1 at the front of the machine, a transmission case 2 at the rear, and a chain case 3 on the right side of the transmission case 2. A rotary case 4 of a rotary tiller is connected to the back of the transmission case 2. Further, the starting ends of a pair of left and right handle bars 5 are attached to the upper part of the transmission case 2, and one propulsion wheel 6 is installed at the lower part of the chain case 3 so as to be inserted below the engine 1 and the transmission case 2. It is configured as a one-wheeled walking management machine.

As shown in FIGS. 2 and 3, the rotary case 4 includes an upper case portion 4a that can be attached to and removed from the transmission case 2, and a rotating case portion 4b that can be rotated about a vertical axis (P) with respect to the upper case portion 4a. A pipe-shaped frame 12 belonging to the rotating case portion 4b is constituted by
The rotating case part 4b is fixed to the upper case part 4a by pressing the flange part 12a formed on the upper part of the ring-shaped member 13 between the bottom surface of the upper case part 4a and the ring-shaped member 13.
This is accomplished by tightening bolts 14 that pass through the upper case portion 4a and are screwed into the upper case portion 4a. Also, by loosening the bolts 14, the rotating case portion 4b
becomes rotatable around the axis (P) and can be rotated manually.

The driving of the pawl shafts 8 and 9 provided in the rotating case portion will be explained in detail based on the figure. The driving force from the transmission case 2 is transmitted to the drive shaft 15 that vertically passes through the inside of the pipe-shaped frame 12. and drives and rotates an output bevel gear 16 spline-connected to the lower end of the drive shaft. Further, in the lower part of the rotary case 4, claw shafts 8 and 9 are mounted on bearings 1 in the left and right directions respectively in the figure.
7, 17, and each pawl shaft 8,
In order to prevent the core from swinging, a common short rod 18 is fitted inside the rod 9 so that it can rotate freely. Also, the left claw shaft 8
An input bevel gear 19 is fitted onto the outside so as to be freely rotatable, and an input bevel gear 20 is spline-connected to the right pawl shaft 9. And each input bevel gear 19, 20 is connected to the output bevel gear 1.
6 and is assembled so as to be able to transmit transmission.
Further, a clutch sleeve 21 serving as a rotational direction switching mechanism is fitted onto each of the pawl shafts 8 and 9 in a slidable and transmittable manner to the respective spline portions 8a and 9a.

The position of the clutch sleeve 21 shown in the figure is when the left and right pawl shafts 8 and 9 are driven and rotated in the same direction, but the transmission at this time is from the right input bevel that meshes with the output bevel gear 16. 20, which is transmitted to the right pawl shaft 9, and further connects the left and right pawl shafts 8, 9.
By driving the left pawl shaft 8 through the two pawl shafts 8 and 9, both pawl shafts 8 and 9 are driven and rotated in the same direction.

Further, the bevel gear 19 on the left side in the figure is formed with an engaging claw 19a that can engage with the engaging claw 21a of the clutch sleeve 21, and in the figure, the gear engages with the engaging claw 21a of the clutch sleeve 21. However, by sliding the clutch sleeve 21 to the left, the connection between the left and right pawl shafts 8, 9 is released, and the left and right pawl shafts 8, 9 are driven to rotate in opposite directions. Become.

The clutch sleeve 21 is manually operated, and is operatively connected to a swing lever 7 attached to the outside of the lower end of the rotating case portion 4b, as shown in FIGS. 1 and 2. It is operated by

4 to 7 schematically show a plan view of the working mode that can be performed by adjusting the rotation of the rotary case 4.

The one in Fig. 4 is a form used for normal tillage work, and the claw shafts 8 and 9 are set in the left and right direction of the machine, and the width of the tillage (W) is determined by the tilling claws attached to the claw shafts 8 and 9. 10 and 11. In addition, this configuration corresponds in plan view to a configuration in which the rotary case 4 is rotated 180 degrees to switch from a so-called down cut to an up cut.

The one shown in Fig. 5 is mainly used for trench digging work and earth raising work, and the claw shafts 8 and 9 are set toward the front and rear directions of the machine body, and in this case, the front and rear claws 27 and 28 are A band-like material is used to increase the success rate of the above-mentioned flip-up.

Furthermore, the front and rear pawl shafts 8 and 9 are driven and rotated in opposite directions by the aforementioned switching mechanism, thereby canceling out the digging reaction force received from the front and rear pawls 8 and 9, thereby improving steering performance. , so that dirt is thrown away from the left and right sides of the aircraft. Furthermore, the front and rear claws 27, 28
, the diameter d of the front claw is the diameter D of the rear claw
It is designed to be smaller and is designed to evenly throw soil away from both sides.

The one shown in FIG. 6 is a form used for plowing, trench digging, etc., and is not limited to specific work, but it is a form of tilling width that is required without replacing the tilling claws 10, 11. (W), and by setting the rotation angle of the rotary case 4 according to the purpose of the work, it is possible to handle a wide variety of work. Note that the arrows shown in FIGS. 4 to 6 indicate the traveling direction of the aircraft.

FIG. 7 shows another embodiment. In this example, instead of the manual clutch lever 7, the clutch sleeve 21 is automatically switched by rotating the rotating case portion 4b of the rotary case 4. In other words, the rotating case part 4
b A swinging member 22 corresponding to the lever 7 is pivotally supported in the lower case, and is supported by a spring 23.
The respective pawl shafts 8 and 9 are biased in the direction of being driven in the same direction. Further, the tip of the swinging member 22 passes through a guide hole 24a formed in the guide member 24 and locks the clutch sleeve 21. In addition, the pipe frame 12 is attached to the guide member 24.
A rod 25 extending upwardly along the ring-shaped member 13 is welded to the rod 25, and the upper end thereof is configured to abut against a cam surface 26 protruding from the ring-shaped member 13. The rotating parts 4b are arranged in two positions symmetrically with respect to the axis (P) so that they operate when the rotating parts 4b are rotated by 90 degrees and the claw shafts 8 and 9 are in a posture facing the front and rear of the aircraft body. . When the cam surface 26 comes into contact with the upper end of the rod 25, the rod 25 is pressed downward, causing the swinging member 22 to swing against the spring 23, causing the clutch sleeve 21 to slide, and as described above, the left and right claws The shafts 8 and 9 are driven to rotate in opposite directions.

[Brief explanation of drawings]

The drawings show examples of the rotary tilling device according to the present invention, and FIG. 1 shows a walk-behind tiller to which the rotary tilling device of the present invention is attached, FIG. 2 shows a rear view of the rotary tilling device, and FIG. 3 shows a rotary case. FIGS. 4 to 6 are schematic plan views of working configurations, and FIG. 7 is another embodiment of the clutch switching section. 4... Rotary case, 8... Claw shaft, 9... Claw shaft, 21... Switching mechanism.

Claims (1)

[Claims] 1. A rotary case 4 with left and right pawl shafts 8, 9 protruding from its lower end is configured to be freely rotatable by 90 degrees or more around a vertical axis (P), so that both pawl shafts 8, 9 are directed in the front-rear direction. A rotary cultivating device configured to be usable in a posture and provided with a rotational direction switching mechanism 21 for switching between a state in which both claw shafts 8 and 9 are rotationally driven in the same direction and a state in which they are rotationally driven in mutually opposite directions.