JPS6343048B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rice transplanter that is interlocked and connected to a traveling vehicle body via an elevating mechanism that raises and lowers the rice transplanter via a hydraulic device or the like. Generally, in the case of this type of rice transplanter, When turning around near a headland during work, a large running load is applied and the motor stalls when turning at high speed. Therefore, since the rice transplanter is raised when performing a turning operation, it may be possible to configure the rice transplanter to reduce the speed and transmit the power from the prime mover to the drive system to the traveling section when the rice transplanter is raised. Although it is conceivable that the above objective can be achieved, the running load may vary within a considerable range depending on conditions such as the depth and soil quality of the field where seedlings are planted, and the running speed will be significantly reduced even in fields where large loads are not applied during turning. This can lead to extremely inefficient work, or conversely,
The drawback is that the engine stalls due to insufficient deceleration even in fields that are subject to heavy loads.

Therefore, the present invention has taken the following technical measures from the above point of view.

That is, the rice transplanter 12 is connected to the traveling vehicle body 1 via the lifting mechanism 25, and a continuously variable transmission mechanism 34 is provided in the drive system that transmits power from the prime mover 6 to the traveling section of the traveling vehicle body 1. The rice transplanter is constructed by providing an interlocking mechanism 44 that interlocks the continuously variable transmission mechanism 34 to switch to a low speed side when raising the rice transplanter, and in this interlocking mechanism 44, a speed change adjustment device 51 of the continuously variable transmission mechanism 34 is provided. .

This invention will be described in detail based on an embodiment shown in the drawings.

Reference numeral 1 denotes a running vehicle body, which includes a pair of left and right front wheels 2, 2 for steering and a drive wheel 5 supported by a pair of left and right chain cases 4, 4 provided from both left and right sides of a rear transmission case 3 toward the rear lower part. , 5, a prime mover 6 is mounted on the upper part of the front end, and a pilot seat 7 is attached via a support stand 8 so as to straddle the pair of left and right chain cases 4, 4. Reference numeral 9 indicates a handle provided on the rear side of the prime mover 6.

Reference numeral 10 denotes a front transmission case, which transmits power to the front wheels 2, 2 and to the rear transmission case 3, but the front and rear transmission cases may be integrated. good.

11 is a bonnet that covers the prime mover 6.

12 is a rice transplanter, planting part transmission case 13
Seedling tank 14 that moves back and forth at a constant speed from side to side on the top of the
It consists of a seedling planting rod 15 that moves up and down at the rear, and soil leveling floats 16 and 17 that are pivoted at the rear at the bottom and attached via links so that they can move up and down at the front.

Reference numeral 18 denotes an elevating link for attaching the rice transplanter 12 to the traveling vehicle body 1 so that the rice transplanter 12 can be moved up and down. A rolling metal 23 which also serves as a transmission case is provided at the tip of the rice transplanter 23 to form a parallel link, and a rolling shaft 24 is attached to the rolling metal 23 so that the rice transplanter 12 can be mounted so as to be able to roll left and right and move up and down. ing.

25 is a hydraulic device which is an example of a lifting mechanism;
Traveling vehicle body 1 and upper link 19 of the elevating link 18
a hydraulic cylinder 26 and its piston 27 between
and a hydraulic pump 2 driven by a prime mover 6.
a relief valve 29 that can adjust hydraulic pressure from 8; and a hydraulic switching valve 3 interposed between the planting portion transmission case 13 of the rice transplanter 12 and the soil leveling float 16;
An operating lever 31 provided in a position near the pilot seat 7 and the switching valve 30 are connected by a wire 32 so that oil is sent to the hydraulic cylinder 26 via the operating lever 31. The rice transplanter 12 is configured to be able to move up and down by changing the hydraulic pressure switching valve 30 at will. In addition, the switching valve 30 is automatically switched by the float 16 so that the rice transplanter 12 is raised when the soil leveling float 16 is moved upward, and lowered when the soil leveling float 16 is moved downward during the seedling planting work. Automatic control is performed so that the leveling floats 16 and 17 are maintained at a predetermined appropriate ground pressure on the soil surface. Note that 33 indicates a hydraulic tank.

34 is a continuously variable transmission mechanism, and 3 is connected to the output shaft of the prime mover 6.
A fixed side pulley piece 37 integrally provided with a shaft cylindrical portion 36 is wedge-attached to the shaft cylindrical portion 36, and a movable pulley piece 3 is attached to the shaft cylindrical portion 36.
8 are fitted, and the movable pulley piece 38 is always pressed against the fixed pulley piece 37 by the spring 39, and the belt 4 is inserted between the fixed and movable pulley pieces.
A winding groove of 0 is formed, and the winding groove is expanded or contracted according to fluctuations in the tension of the belt 40, and the driven part driven by the prime mover 6 is provided so as to change the speed. Then, the belt 40 is wound between the V-pulley for continuously variable transmission configured in this way and the V-pulley 41 wedged on the input shaft of the front transmission case 10, and the tension of the belt 40 is applied. A changeable tension pulley 42 is provided.

The base of the attachment arm 45 of the tension pulley 42 is pivotally attached to the traveling vehicle body, but in the embodiment shown in FIGS. ing.

44 is an interlocking mechanism, which in the embodiment shown in FIG. 1 is a release wire 48 consisting of an inner wire 46 and an outer wire 47 that connect the operating lever 31 and the mounting arm 45 of the tension pulley 42; Furthermore, in the embodiment shown in FIG. 2, an inner wire 46a and an outer wire 47a connect a frame integrated with the rolling metal 23 attached to the tip side of the lifting link 18 and the mounting arm 45 of the tension pulley 42. This corresponds to the release wire 48a. Furthermore, when the mounting arm 45 of the tension pulley 42 is actuated by the hydraulic cylinder 49 and its piston 50 as in the embodiment shown in FIG.
This corresponds to a release wire 48b consisting of an inner wire 46b and an outer wire 47b that connect the operating lever 29a of the variable relief valve 29 provided in the hydraulic system for sending oil to the operating lever 31 or the lifting link 18. be.

In any case, when the rice transplanter 12 is lifted up via the release wire, the tension pulley 42 tensions the belt 40, and the pitch circle around which the continuously variable transmission V-pulley is wrapped becomes smaller in diameter, thereby decelerating the traveling section. It is configured as follows.

Reference numeral 51 indicates a speed change adjustment operation, which in the case of FIG. 1 is a turnbuckle that changes and adjusts the length of the outer wire 47 of the release wire 48;
In the case of the figure, when the end of the outer wire 47a is fastened to the upper link 19, the position of the stop frame 52 at this end can be changed freely by a lever 53. Furthermore, in the embodiment shown in FIG. 4, the length of the hydraulic piston 50 is made extendable and retractable via an extendable nut 54. The telescopic nut 54 has a left-hand thread and a right-hand thread extending from its middle portion toward both left and right ends, respectively, and the piston 50 is divided into two halves and screwed together. piston 5
0 can be expanded and contracted.

Next, to explain the operation of the above example, rice transplanter 1
Place the pine seedlings with soil in the seedling tank 14 of No. 2, drive the rotating parts of each part by the prime mover 6, and operate the operating lever 31 in the direction of arrow A to remove the wire 4.
6 and 32, the tension of the V-belt 40 wound from the prime mover 6 to the input shaft of the front transmission case 10 is loosened via the tension pulley 42 to transmit the tension at high speed, and the hydraulic pressure switching valve 30 is switched to change the hydraulic pressure. The rice transplanter 12 is lowered by retracting the piston 27 to start rice transplanting work.

Then, the rice transplanter 12 is towed by the traveling vehicle body 1, and the soil leveling floats 16, 17 of the rice transplanter levitate and slide on the soil surface to level the surface. Also,
The seedling planting rod 15 reciprocates from side to side to feed out the seedlings from the seedling tank 14, divides the seedlings one by one, and plants them one after another on the leveled soil surface.

When the distance between the plow surface and the soil surface in the field, that is, the depth of the paddy field changes, the leveling float 1
When the rice transplanter 6 becomes shallow and descends, or becomes deep and is pushed up and rises, the hydraulic switching valve 30 is automatically switched, and in the former case, the rice transplanter 12 is made to descend, and in the latter case, it is made to rise. The rice transplanter will be automatically controlled to raise and lower.

In this way, seedling planting work is carried out,
To approach the headland and turn the vehicle body 1, first operate the operating lever 31 in the opposite direction of arrow A to raise the rice transplanter 12. Then, the release wire 48 operates the tension pulley 42 in the direction of the arrow (R) to strongly tension the belt 40, and at the same time, the hydraulic switching lever 30 is switched. Therefore, the pitch circle of the continuously variable speed pulley becomes smaller in diameter, and the traveling section is decelerated. Also, in the cases of FIGS. 2 and 4, the traveling section is decelerated using the same principle.

Therefore, even if running resistance becomes large during a turn, the speed is automatically decelerated during the turn, so no undue load is placed on the prime mover 6, the prime mover 6 does not stall unexpectedly, and the turn is made smoothly. From this, the conditions can be reliably adjusted when turning, allowing for accurate turning.

After turning in this manner, in order to enter the seedling planting work state again, by operating the operating lever 31 in the direction of arrow A, the work will be brought into the work start state as described above and the work can be continued.

However, in cases where the paddy field is very deep or the soil is strong clay and a large load is applied during turning, the belt 40 is expanded by expanding the outer wire 47 with a turnbuckle in the case shown in Fig. 1.
Increase the tension. Also in the case of FIG. 2, the tension of the belt 40 is increased by moving the end of the outer wire 47a in the direction of arrow C using the lever 53. Furthermore, in the case of FIG. 4, the tension on the belt 40 is increased by extending the piston 50 using the telescoping nut.
By such an operation, the movable pulley 38 of the continuously variable speed pulley is expanded by the spring 39 and moved in the direction of the arrow D, the pitch circle becomes smaller in diameter, and the traveling section is decelerated.

On the other hand, in cases where the paddy field is extremely shallow, the turning operation is easy and the turning load is not large, so it is better to adjust the tension of the belt 40 to loosen it, contrary to the above.

Since this invention has the above-mentioned configuration, when the rice transplanter approaches the headland and ascends and turns, the traveling speed is automatically reduced to stall the prime mover,
While the operation of each part during turning can be carried out calmly and accurately without panic, the deceleration can be adjusted, and the operation and effect can be achieved to ensure turning at a turning speed suitable for the field conditions.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a side view of main parts of another example, and FIG.
The figure is a plan view of the main part, FIG. 4 is a side view of the main part of another example, and FIG. 5 is a hydraulic circuit diagram. In the figure, the symbols 1 are a traveling vehicle body, 6 is a prime mover, 12 is a rice transplanter, 25 is a lifting mechanism, 34 is a continuously variable transmission mechanism, 44 is an interlocking mechanism, and 51 is a speed change adjustment device.

Claims (1)

[Claims] 1. A rice transplanter is connected to a traveling vehicle body via a lifting mechanism, and a continuously variable transmission mechanism is provided in a drive system that transmits power from the prime mover to the traveling section of the traveling vehicle body, and when the rice transplanter is raised, a continuously variable transmission mechanism is provided. A rice transplanter comprising: an interlocking mechanism interlocked to switch the speed to a low speed side; and a speed change adjustment device for the continuously variable transmission mechanism provided in the interlocking mechanism.