JPH0647343B2 - Four-wheel drive type rice transplanter - Google Patents

Description

TECHNICAL FIELD The present invention relates to a structure of a traveling transmission system in a four-wheel drive type riding rice transplanter.

[Conventional technology]

In the four-wheel drive type rice transplanter, the traveling speed change system is configured such that the drive speed of the front wheels and the drive speed of the rear wheels are substantially equal to each other.

[Problems to be Solved by the Invention]

When turning in a general four-wheeled vehicle, the turning radius of the front wheels becomes larger than the turning radius of the rear wheels, so that a so-called inner / outer wheel difference occurs. Therefore, in order for the four-wheel drive vehicle to smoothly turn, it is preferable to generate a drive speed difference between the front wheels and the rear wheels according to the difference between the inner and outer wheels.

In a riding-type rice transplanter, when one planting process is completed, it turns at the ridge and moves to the next planting process. When turning at the ridge, one side wheel is braked by a side brake. It is designed so that even small ridges can be turned and turned in small turns. In this way, when one of the rear wheels is braked when turning, it is possible to turn with a small radius, but the difference between the inner and outer wheels at that time becomes large near the wheel base length of the aircraft.

However, when the driving speeds of the front wheels and the rear wheels are substantially equal to each other as in the conventional configuration, the driving speed of the front wheels is too slower than the turning speed of the front part of the machine body, and the phenomenon of the front wheels slipping or the rear wheels The driving speed is too fast than the turning speed at the rear of the aircraft,
The phenomenon that the rear wheels slip occurs. When such a slip phenomenon occurs, there is a possibility that the rice paddy may be roughened by the slipping front wheels or rear wheels, or the seedlings that have already been planted may be tilted due to waves generated by the front wheels or the rear wheels.

It is an object of the present invention to prevent a phenomenon in which a paddy field is roughened or seedlings already planted are tilted when a four-wheel drive type rice transplanter makes a small turn around a ridge.

[Means for solving problems]

A feature of the present invention is that the four-wheel drive riding type rice transplanter as described above is configured as follows.

Equipped with a rear-wheel transmission that can switch between a standard drive state in which the drive speeds of the front and rear wheels are approximately equal, and a rear-wheel deceleration state in which the drive speed of the rear wheels is slower than the drive speed of the front wheels. Each side wheel is braked independently, and one rear wheel is braked by the side brake, and when the necessary operation for the seedling planting device performed during turning in the paddy field is performed, the rear wheel shift There is provided operation means for switching the device to the rear wheel deceleration side.

[Work]

(I) With the configuration according to the present invention, when the aircraft reaches the edge,
By braking one rear wheel by the side brake and performing the necessary operation for the seedling planting device that is performed when turning in the paddy field, the rear wheel will decelerate compared to the front wheel and the aircraft will make a small turn. To go.

As a result, the difference between the driving speed of the front wheels and the turning speed of the front part of the fuselage, and the difference between the driving speed of the rear wheels and the turning speed of the rear part of the fuselage are smaller than in the conventional configuration, and the slip phenomenon of the front wheels or the rear wheels is reduced. Is less.

(Ii) As a configuration for operating the rear wheel transmission to the rear wheel deceleration side, only by braking operation to one rear wheel by the side brake,
It is conceivable to configure the rear wheel transmission to operate to the rear wheel deceleration side.

With this configuration, if a worker mistakenly operates one of the side brakes while going straight during the planting process, the rear wheels will be decelerated and the traveling speed of the entire aircraft will also decrease, resulting in The seedling planting interval in the direction of movement changes.

On the other hand, in the present invention, in addition to the braking operation to one rear wheel by the side brake, a unique operation of the riding-type rice transplanter, which is a necessary operation for the seedling planting device performed at the time of turning in the paddy field, is performed. Otherwise, the rear wheels will not be decelerated.

It is very rare that the two operations are mistakenly performed at the same time unless the operator is consciously performing them. Therefore, according to the present invention, when the vehicle goes straight during the planting process,
There is no chance that the rear wheels will be decelerated by mistake.

(Iii) Also, in the case of a deformed paddy field that bends significantly compared to a general rectangular paddy field, one of the rear wheels is braked by the side brake even during the planting process to greatly change the orientation of the aircraft. There are cases.

In such a case, since the necessary operation for the seedling planting device has not been performed, the rear wheel is not decelerated by the configuration of the present invention. As a result, in the modified paddy field, the orientation of the machine body can be changed by one side brake without any trouble, without the adverse effect of changing the seedling planting interval.

〔The invention's effect〕

As described above, it is possible to reduce the surface roughness of the paddy field due to the slip phenomenon of the front wheels or the rear wheels during a small turn in the paddy field, and to reduce the adverse effects on the seedlings caused by the waves generated by the front wheels or the rear wheels. It was possible to improve the turning performance of paddy rice transplanters in paddy fields.

Then, the rear wheels are decelerated by the two unique operations of the riding type rice transplanter, so that the rear wheels are erroneously decelerated when the vehicle goes straight during the planting process, and the seedlings are planted. It was possible to prevent the adverse effect that the interval changed.

Also, in the modified paddy field, it is possible to change the orientation of the aircraft with one side brake without any trouble, without the adverse effect of changing the seedling planting interval due to the rear wheel deceleration operation. Driving performance can also be improved.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, front wheels (1a), (1b) and rear wheels (2a), (2
The engine frame (3) supported by b) is equipped with the engine (4) and the control part (5), and the seedling planting device (7) is connected via the four-link mechanism (6) so that it can move up and down. It composes a four-wheel drive type rice transplanter.

Next, the power transmission system will be described. As shown in Fig. 1, the power from the engine (4) is the tension clutch (8).
Via the two forward gears and one reverse gear, and the gears are operated to be transmitted to the front wheels (1a), (1b).
The power branched from the differential mechanism (not shown) of a) and (1b) is transmitted to the rear wheel mission (30) via the first transmission shaft (10), the rear wheel transmission (11) and the second transmission shaft (12). ) Is transmitted to the rear wheels (2a), (2b).

Next, the rear wheel transmission (11) will be described. As shown in FIG. 1, the first and second transmission shafts (10) and (12) are arranged so as to face each other, and the shift member (13) is slidably attached to the first transmission shaft (10) by a spline structure. It is fitted over. At the time of normal straight travel, by the spring (14) through the swing type shifter (15),
The shift member (13) is urged toward the occlusal side of the second transmission gear (25) of the second transmission shaft (12) and engages with this, so that the first and second transmission shafts (10), (12) are Directly connected, front wheels (1a), (1b)
And the rear wheels (2a) and (2b) are in the standard drive state in which the drive speeds are equal.

In the rear wheel transmission (11), the first transmission gear (16) is loosely fitted onto the first transmission shaft (10), and the shift member (13) is operated to the occlusal side of the first transmission gear (16). A hydraulic cylinder (17) (corresponding to an operating means) is provided on the shifter (15).

Inside the rear wheel mission (30), side brakes (18a), (18b) that independently brake the left and right rear wheels (2a), (2b) are provided, and these side brakes (18a), (18b) are A pair of limit switches (20a), (20b) for detecting this stepping operation is provided for the linked side brake pedals (19a), (19b), and these limit switches (20a), (20b) are used as control devices. (twenty one)
It is connected to the. The lever (22) that operates the seedling planting device (7) up and down via hydraulic pressure is also equipped with a limit switch (23) that detects the operation to the upside.
(23) is connected to the control device (21).

With the above configuration, when one planting process is completed and the ridge is reached, the raising / lowering lever (22) raises the seedling planting device (7) (the seedling planting device used when turning in the paddy field). (Corresponding to the necessary operation for (7)), and when one of the side brake pedals (19a), (19b) is stepped on while steering the front wheels (1a), (1b), the control device (21) is The control valve (24) for the hydraulic cylinder (17) is operated to the pressure oil supply side.

As a result, the shift member (13) meshes with the first transmission gear (16), and the power of the first transmission shaft (10) is transmitted to the second transmission gear (25) via the third transmission shaft (26). To be done. This transmission is the front wheel (1
This is a rear wheel deceleration state in which the driving speeds of the rear wheels (2a), (2b) are reduced more than the driving speeds of a), (1b), and in this transmission state, the aircraft can smoothly make small turns.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a four-wheel drive type riding rice transplanter according to the present invention, and FIG. 1 is a schematic plan view showing a rear wheel transmission and a side brake and a rear wheel transmission in a linked state. [Fig. 3] is an overall side view of a riding-type rice transplanter. (1a), (1b) ...... Front wheel, (2a), (2b) ...... Rear wheel, (7) ...... Sapling planting device, (11) ...... Rear wheel transmission, (17) ...... Operating means ,
(18a), (18b) ...... Side brakes.

Claims (1)

[Claims] 1. A standard driving state in which the driving speeds of the front wheels (1a), (1b) and the rear wheels (2a), (2b) are substantially equal, and the driving speeds of the rear wheels (2a), (2b) are set to the front wheels (1a). ), (1b) is equipped with a rear wheel transmission (11) that can switch to a rear wheel deceleration state in which the vehicle is decelerated from the driving speed, and the left and right rear wheels (2a), (2b) are independently braked. Equipped with brakes (18a) and (18b), one of the rear wheels (2
When a) and (2b) are braked and the necessary operation for the seedling planting device (7) that is performed when turning in the paddy field is performed, the rear wheel transmission (11) is moved to the rear wheel deceleration side. Operation means to switch to
A four-wheel drive type rice transplanter equipped with (17).