JP3290821B2 - Riding paddy working machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a traveling system in a four-wheel drive riding paddy working machine such as a riding rice transplanter or a riding direct sowing machine.

[0002]

2. Description of the Related Art In a riding rice transplanter, which is an example of a four-wheel drive riding paddy working machine, generally, the front and rear wheels are constantly driven at the same speed regardless of turning or straight traveling. In recent years, a front wheel transmission that can be switched between a standard state in which the front wheels and the rear wheels are driven at substantially the same speed and a speed-up state in which the front wheels are driven at a higher speed than the rear wheels is used in the transmission system to the front wheels. It has been proposed to provide. Thus, the front wheel transmission is configured to be switched from the standard state to the speed increasing state when turning by steering the front wheel, so that turning on the ridge can be smoothly performed without roughening the rice field. I do.

[0003]

In the above-mentioned riding type rice transplanter, a seedling planting device (corresponding to a ground working device) is connected to the rear of the body so as to be able to move up and down freely. In the riding type rice transplanter, when one planting process is completed and the aircraft reaches the edge of the ridge, the worker raises the seedling planting device that is in contact with the rice field and almost at the same time, the front wheel is operated by the steering wheel. The steering operation is performed, and the vehicle turns into a turn on the ridge. in this case,
The ascending speed of the seedling planting device is limited, and particularly when many seedlings are on the seedling cradle, the ascending speed of the seedling planting device is not very fast.

Therefore, when such a riding type rice transplanter is equipped with the front wheel transmission as described above, the front wheels are driven at an increased speed while the seedling planting device rises a little slowly when turning on the ridge. This causes the aircraft to start turning quickly. As a result, when the seedling planting device at the rear of the aircraft is swung in the opposite direction after the aircraft starts to turn, if the seedling planting device has not yet sufficiently risen from the rice field, the seedlings that have been swung to the side are The planting device may come into contact with the seedlings planted in the previous planting process and the seedlings may be overthrown. The present invention provides a four-wheel-drive riding paddy working machine such as a riding type rice transplanter or a riding type direct sowing machine equipped with a front wheel transmission, even though the ground working device has not yet been sufficiently raised from the rice field. It is another object of the present invention to prevent a problem caused by the front wheel transmission being driven to increase the speed of the front wheels to start turning at the ridge.

[0005]

The feature of the present invention resides in the following configuration of the riding paddy working machine as described above. In other words, the ground work device is connected to the rear part of the fuselage so as to be able to move up and down freely, so that the front wheel and the rear wheel are driven at substantially the same speed, and the front wheel is driven at a higher speed than the rear wheel. In addition to a front wheel transmission that can be switched freely, a ground contact detection sensor that detects whether the ground working device is in contact with the rice field surface, and an operation amount sensor that detects the right and left steering operation amounts of the front wheels are provided. With the start of the operation of the ground working device on the ascending side, when the ground working device moves upward from the rice field surface and the steering operation amount to the right or left of the front wheel reaches the set value, the front wheel transmission is operated. Operation means for switching from the standard state to the speed increasing state is provided.

[0006]

[Function] With a riding paddy working machine, when one work cycle is completed and the aircraft reaches the ridge, the worker generally starts the ascent operation of the ground work equipment that is in contact with the rice field, and then the steering handle Thus, the steering operation of the front wheels is started.
With this configuration, when the ground operation device is lifted to some extent and completely lifted up from the rice field, when the right or left steering operation amount of the front wheel reaches a set value, the front wheel transmission device Is switched to the speed increasing state.

In this case, at the same time that the ground working device is lifted to some extent and completely lifted off the rice field surface, the front wheel transmission is switched to the speed increasing state, or the right or left steering operation of the front wheels is performed. If the amount is late to reach the set value,
Before the right or left steering operation amount of the front wheel reaches the set value,
The ground working device is in a state of being further lifted from a state of being separated upward from the rice field surface. Therefore, when configured as in the present invention, the front wheel transmission is set to the standard state in a state where the ground working device is lifted to some extent and completely lifted off the rice field surface, or in a state where the ground working device is further raised from this state. The operation is switched from the state to the speed increasing state.

[0008]

As described above, in the four-wheel-drive riding paddy working machine equipped with the front wheel transmission, ascending operation of the ground work device is started and the ground work device is raised to some extent from the rice field. Since the front wheel transmission is switched to the speed increasing state after the ground work device is sufficiently raised, the front wheel transmission is speeded up when the ground work device is not fully raised. Problems caused by the switching operation to the state were prevented beforehand, and the workability of the riding paddy working machine could be improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an engine 3 is provided at a front portion of a body supported by a front wheel 1 and a rear wheel 2, and a control section 4 is provided at a center of the body. And a seedling planting device 7 (corresponding to a ground working device) connected to the four link mechanism 6 to constitute a riding type rice transplanter which is an example of a riding type paddy working machine. .

Next, the transmission structure of the traveling system of the riding type rice transplanter and the transmission structure to the seedling planting apparatus 7 will be described.
As shown in FIGS. 2 and 1, the power from the output shaft 8 of the engine 3 at the front of the body is transmitted via a transmission shaft 9 to the input shaft of a multi-plate friction type main clutch 10 provided at the rear of the body. The power from the main clutch 10 is transmitted to the left and right rear wheels 2 via a hydrostatic stepless transmission 12, a gear transmission type auxiliary transmission 14 in a transmission case 13, and a rear wheel differential device 15. Is transmitted. The power branched immediately before the rear wheel differential device 15 is transmitted to the left and right front wheels 1 via the front wheel transmission shaft 16, the front wheel transmission device 25, and the front wheel differential device 17.

The front wheel transmission 25 has a standard state in which the front wheel 1 and the rear wheel 2 are driven at substantially the same driving speed by sliding the shift member 25a with an operating cylinder 26 (corresponding to an operating means). 1 is configured to be freely operable to switch between two states of a speed-up state in which the current drive speed of the front wheels 1 and the rear wheels 2 is higher than the current drive speed.

As shown in FIGS. 2 and 1, a first PTO shaft 18 is provided at the rear end of the transmission case 13,
The power branched from the continuously variable transmission 12 is transmitted to the first PTO shaft 18 via the planting interval changing device 19 and the planting clutch 20.
And the power from the first PTO shaft 18 is transmitted to the transmission shaft 21
Is transmitted to the seedling planting device 7 via the. In this riding type rice transplanter, a second PTO shaft 22 is arranged at the rear of the body. A power transmission mechanism 23 of a gear transmission type is arranged between the input shaft 11 of the main clutch 10 and the transmission shaft 9, and the power from the output shaft 24 of the power transmission mechanism 23 is transmitted via the transmission shaft 28 to the second PTO. It is transmitted to the shaft 22. And power take-out mechanism 2
The hydraulic pump 27 is connected to the third intermediate shaft 29.

As shown in FIG. 3, a raising and lowering lever 30 for raising and lowering the seedling planting apparatus 7 and for turning on and off the planting clutch 20 is provided.
Is provided. A sensor float 32, which follows the ground surface G on the ground surface, is supported swingably up and down around the horizontal axis P <b> 1 of the support arm 31 of the seedling planting device 7.
The seedling plant 7 is provided with a potentiometer 33 (corresponding to a ground detection sensor) for detecting the vertical angle of the sensor float 32 with respect to.

When the raising / lowering lever 30 is operated to the planting position, the planting clutch 20 shown in FIG.
4 and operated by the potentiometer 33 of FIG.
So that the detected value of the hydraulic cylinder 5 is maintained at the set value.
Thereby, the seedling planting apparatus 7 is automatically moved up and down. Thereby, the height of the seedling planting apparatus 7 from the rice field G (planting depth of the seedling) is maintained as a pair. When the raising / lowering lever 30 is operated to the raising position, the neutral position, and the lowering position, the raising, stopping, and lowering operations of the seedling planting device 7 by the hydraulic cylinder 5 in a state where the planting clutch 20 is turned off by the operation cylinder 34. Can be performed.

Next, a description will be given of a case where the front wheel transmission 25 is switched from the standard state to the speed-up state at the time of turning on the bank. As shown in FIG. 4, when one planting process is completed and the machine reaches the ridge, the operator operates the lifting lever 30 at the planting position to the raised position (step S).
1). As a result, the planting clutch 20 is disengaged by the operation cylinder 34, the seedling planting device 7 stops the planting operation (step S2), and the hydraulic cylinder 5 starts the raising operation of the seedling planting device 7 from the rice field surface G. (Step S
3). At the same time, the operating cylinder 3 shown in FIG.
5, the continuously variable transmission 12 is automatically decelerated (step S4).

In this case, the seedling planting device 7 (support arm 3)
In the sensor float 32, which is supported so as to be able to swing up and down around the horizontal axis P1 in 1), an upper limit and a lower limit are set in the up and down swing range by a stopper (not shown). As a result, when the seedling planting apparatus 7 starts to be lifted in step S3, the sensor float 32 that is in contact with the rice field G also starts to be lifted upward, and the front part of the sensor float 32 starts to fall downward by its own weight. Then, when the seedling planting device 7 is lifted to some extent from the rice field G, the entire sensor float 32 is lifted from the rice field G, and the sensor float 32 reaches the lower limit of the above-mentioned vertical swing range.

As shown in FIG. 3, an operation amount for detecting the integrated value of the rotation angle as an integrated value of the steering operation amount of the front wheel 1 is provided on a steering handle 36 for artificially steering the front wheel 1 left and right. A sensor 37 is provided. As a result, as described above, the seedling planting device 7 is raised from the rice field G to some extent, and the sensor float 32 reaches the lower limit of the vertical swing range (step S5). From that point, the front wheel 1 (the steering handle 36) is started. Of the steering operation amount is started (step S6).

Then, when the integrated value of the steering operation amount of the front wheel 1 (steering handle 36) reaches the set value (step S).
7) Or, if the front wheel 1 has reached the right or left steering limit before the integrated value of the steering operation amount of the front wheel 1 (steering handle 36) reaches the set value (step S8), the front wheel 1 is shifted to the right or left. It can be determined that the steering operation has been sufficiently performed to the left. During the steering operation of the front wheel 1, the seedling planting device 7 also determines that the sensor float 32 has reached the lower limit of the vertical swing range (step S).
From 5), it can be determined that the ascent operation is further performed. Accordingly, in such a state, the operation cylinder 26 shown in FIG.
As a result, the front wheel transmission 25 is switched from the standard state to the speed increasing state (step S9).

[Alternative Embodiment] In the embodiment of FIG. 4, after the sensor float 32 of the seedling planting device 7 reaches the lower limit of the vertical swing range (step S5), the front wheel 1 (the steering handle 3) is turned on.
6) The integration of the steering operation amount is started (step S6), and when the integrated value of the steering operation amount of the front wheel 1 (steering handle 36) reaches the set value, the front wheel transmission 25 is switched to the speed increasing state. However, this may be configured as follows. When the sensor float 32 of the seedling planting device 7 reaches the lower limit of the vertical swing range, it detects whether or not the steering angle of the front wheel 1 has reached the right or left set angle from the straight-ahead position. If so, the front wheel transmission 25 is switched to the speed increasing state, and if not, the front wheel transmission 25 is switched to the speed increasing state when the steering angle of the front wheels 1 reaches the set angle thereafter. . Conversely, even if the steering angle of the front wheel 1 has reached the set angle, if the sensor float 32 of the seedling planting device 7 has not yet reached the lower limit of the vertical swing range, the front wheel transmission 25 is in the speed increasing state. After the sensor float 32 reaches the lower limit without switching, the front wheel transmission 25 is switched to the speed increasing state.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is an overall side view of a riding rice transplanter.

FIG. 2 is a view schematically showing a transmission system of a riding type rice transplanter.

FIG. 3 is a diagram showing a linked state of a steering wheel, a front wheel transmission, and the like.

FIG. 4 is a diagram showing a flow of control at the time of turning on a ridge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front wheel 2 Rear wheel 7 Ground work device 25 Front wheel transmission 33 Ground detection sensor 37 Operation amount sensor G

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A01C 11/02 A01B 69/00 B60K 17/348 B62D 11/08

Claims (1)

(57) [Claims] 1. A ground working device (7) is movably connected to a rear portion of a fuselage so that a front wheel (1) and a rear wheel (2) are driven at substantially the same speed. A ground detection sensor for detecting whether or not the ground work device (7) is in contact with a rice field surface (G), the front wheel transmission device (25) being operable to switch to a speed-up state driven at a higher speed than the wheels; (33) and an operation amount sensor (37) for detecting an operation amount of the front wheel (1) to the right and left, to start the operation of the ground working device (7) to the ascending side. Accordingly, the ground working device (7) moves upward from the rice field (G),
When the amount of steering operation of the front wheel (1) to the right or left reaches a set value, a riding type equipped with operating means for switching the front wheel transmission (25) from a standard state to a speed increasing state. Paddy working machine.