JP3072228B2 - 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]

When the vehicle is equipped with the above-described front wheel transmission and makes a turn while driving the front wheels at an increased speed, the body of the vehicle is pulled in the direction of the front wheels quickly. Turns, so that a certain amount of skill is required for the driving operator to perform the turning operation using the front wheel transmission. However, in a riding rice transplanter, not only skilled workers drive, but also inexperienced workers may drive. INDUSTRIAL APPLICABILITY The present invention relates to a four-wheel-drive riding paddy working machine such as a riding type rice transplanter or a riding type direct sowing machine. It is intended to be configured to be able to perform.

[0004]

The feature of the present invention resides in the following configuration of the riding paddy working machine as described above. That is, [1] a front wheel that can be freely switched between a standard state in which the front wheels and the rear wheels are driven at substantially the same drive speed and a speed-up state in which the front wheels are driven at a higher speed than the current drive speeds of the front and rear wheels. Rear wheel transmission that can be switched between a transmission and a standard state in which the front wheels and the rear wheels are driven at substantially the same driving speed and a deceleration state in which the rear wheels are driven at a lower speed than the current driving speeds of the front and rear wheels. A first turning state in which the front wheel transmission is switched from a standard state to a speed increasing state when the front wheels are steered from a straight position to a right or left set angle or more; and When the steering operation is performed from the straight position to the right or left setting angle or more,
A second turning state in which the rear wheel transmission is switched from a standard state to a decelerating state is set, and any one of the first turning state and the second turning state is artificially changed.
Selection means for selecting is provided.

[2] A standard state in which the front wheels and the rear wheels are driven at substantially the same drive speed.
And the front wheels are driven at a higher speed than the current drive speed of the front and rear wheels.
A front-wheel transmission that can be freely switched to a speed-up state
The standard condition where the wheels and the rear wheels are driven at substantially the same drive speed, and
The rear wheels are driven at a reduced speed compared to the current drive speed of the front and rear wheels.
A rear wheel transmission that can be freely switched to a deceleration state,
The operation speed of the steering wheel that artificially steers the front wheels
Operation speed detecting means for detecting
When the steering operation is performed beyond the right or left set angle from the advanced position
Then, the front wheel transmission is switched from the standard state to the speed increasing state.
The first turning state to be made and the right or left
When the steering operation is performed beyond the set angle of the rear wheel transmission,
Second turning state in which is switched from the standard state to the deceleration state
Set bets, the operation speed of the steering wheel is the first turning state is automatically selected to be fast, the steering operation speed is the second turning state is automatically selected to be the low speed of the handle Selection means configured to be operated. [3] In the configuration of the above item [1] or [2], a pair of left and right side brakes capable of independently braking the right and left rear wheels is provided, and one of the left and right side brakes is operated on the braking side. Checking means for permitting the operation of the selection means only when the vehicle is on the vehicle.

[0006]

[Action]

[I] In the case where the front wheel transmission and the rear wheel transmission as described in [1] above are provided, when the front wheel transmission is switched to the speed increasing state during turning, the front portion of the body is oriented in the direction of the front wheels driven at the increased speed. Is pulled and the aircraft turns quickly,
Conversely, when the rear-wheel transmission is switched to a deceleration state during turning, the aircraft turns smoothly due to the difference in drive speed between the front wheels and the rear wheels in a state where the turning speed is entirely reduced.

[0007] Therefore, with the configuration as described in [1] above, the first turning state and the second turning state may be selected according to the skill and preference of the operator performing the driving (in general, a skilled worker is required). The first turning state may be selected, and the second turning state may be selected for an inexperienced worker). Thereby, regardless of the skill and preference of the worker, the turning on the ridge can be smoothly performed without roughening the rice field.

[II] When configured as in the preceding section [2],
As in the case of the configuration of the preceding paragraph [1], it has the “operation” described in the preceding paragraph [I], and additionally has the following “operation”. When focusing on the skill of a driving operator, generally, when turning around a ridge, the operation of the steering handle of a skilled worker is quick, and the operation of the steering handle of an unskilled worker is often slow. Therefore, when the vehicle is configured as in the above item [2], the first and second turning states are automatically selected according to the operation speed of the steering handle at the time of turning.
It is not necessary to perform an operation of selecting the first and second turning states in advance by using a changeover switch or the like.

[III] When configured as in the preceding paragraph [3], it has the "action" described in the preceding paragraph [I] or [II], similarly to the configuration of the preceding paragraph [1] or [2], In addition, it has the following “action”. In the riding type paddy working machine, when one work stroke is completed and the aircraft reaches the ridge, the operator operates the right or left side brake on the turning center side brake side to the braking side, and operates the steering wheel. Often starts to steer. Therefore, the configuration as described in [3] above prevents the front wheel transmission from being switched to the speed increasing state and the rear wheel transmission from being switched to the decelerating state other than at the ridge.

[0010]

According to the first aspect of the present invention, a front wheel transmission and a rear wheel transmission are provided to selectively use the front wheel transmission and the rear wheel transmission when turning on a bank. Regardless of skill or preference, turning on the ridge can be performed smoothly without roughening the rice field, and the turning performance of the riding paddy working machine could be improved.

According to the second aspect of the invention, the "effect of the invention" of the first aspect is provided in the same manner as in the case of the first aspect. Further, when configured as in claim 2, the first speed of the front wheel transmission is determined by the operation speed of the steering wheel.
Since the turning state and the second turning state of the rear wheel transmission are automatically selected, the operability can be improved.

According to a third aspect of the present invention, the above-mentioned "effect of the invention" of the first or second aspect is provided, similarly to the case of the first or second aspect. According to the third aspect of the present invention, the front wheel transmission is not switched to the speed-up state except at the edge of the ridge (the rear wheel transmission is not switched to the deceleration state). This prevents a problem caused by a large change in the direction of the machine body (wheel transmission device) (a row of seedlings to be planted in the case of a riding type rice transplanter is largely bent).

[0013]

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. A quadruple link mechanism 6 is provided, and a seedling planting device 7 is connected to the quadruple 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 a hydrostatic continuously variable transmission 12, a gear transmission type auxiliary transmission 14 in a transmission case 13, a rear wheel transmission 15, and a rear wheel differential device 1.
6 to the right and left rear wheels 2. Rear wheel transmission 1
5 is transmitted to the left and right front wheels 1 via the front wheel transmission shaft 17, the front wheel transmission 18, and the front wheel differential device 19.

The rear wheel transmission 15 is operated by sliding the shift member 15a with the operation cylinder 30.
It is possible to freely switch between a standard state in which the front wheels 1 and the rear wheels 2 are driven at substantially the same driving speed and a decelerated state in which the rear wheels 2 are driven at a lower speed than the current driving speeds of the front wheels 1 and the rear wheels 2. Is configured. The front wheel transmission 18 includes a shift member 18.
a is operated by the operation cylinder 31 so that the front wheel 1 and the rear wheel 2 are driven at substantially the same drive speed, and the front wheel 1 is accelerated faster than the current drive speed of the front wheel 1 and the rear wheel 2 It is configured to be able to freely switch between two driven speed-up states.

As shown in FIGS. 2 and 1, a first PTO shaft 20 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 20 via the planting interval changing device 21 and the planting clutch 22.
And the power from the first PTO shaft 20 is transmitted to the transmission shaft 23
Is transmitted to the seedling planting device 7 via the. In this riding type rice transplanter, a second PTO shaft 24 is arranged at the rear of the fuselage. A power transmission mechanism 25 of a gear transmission type is disposed between the input shaft 11 of the main clutch 10 and the transmission shaft 9, and the power from the output shaft 26 of the power transmission mechanism 25 is transmitted via the transmission shaft 28 to the second PTO. It is transmitted to the shaft 24. And power take-out mechanism 2
The hydraulic pump 27 is connected to the fifth intermediate shaft 29.

As shown in FIG. 3, a position sensor 33 for detecting a steering position of a steering handle 32 for artificially steering the front wheel 1 is provided. As shown in FIGS. 2 and 3, a pair of left and right side brakes 34 capable of independently operating the left and right rear wheels 2 is provided.
The control unit 4 includes a pair of left and right side brake pedals 36 and a limit switch 37 for detecting that the side brake pedal 36 is depressed. ing.

Next, the control at the ridge will be described with reference to FIG. In the riding type rice transplanter, when one planting process is completed and the machine reaches the ridge, the operator depresses the right or left side brake pedal 36 on the side brake pedal 36 on the turning center side. Then, the steering handle 32 starts to be steered. As described above, when the right or left side brake pedal 36 is depressed in the ridge (step S1), the right or left side brake 34 is operated to the braking side by the operation cylinder 35 based on the detection of the limit switch 37. (Step S2), the steering handle 32
As a result of the steering operation, the front wheel 1 starts to be steered, and the aircraft starts turning around the ridge.

When the steering operation of the control handle 32 is started, the detection value of the position sensor 33 shown in FIG. 3 is differentiated, and the operation speed of the control handle 32 is detected (corresponding to operation speed detecting means). . In this case, the steering handle 32
Operation speed is higher than the set value (step S
3) When the position sensor 33 detects that the front wheel 1 has been steered by the operation handle 32 by more than the right or left set angle from the straight-ahead position (step S4), the right or left side brake pedal 36. The right or left side brake 34 is operated to the brake release side irrespective of the stepping operation (step S5), and the operation cylinder 31 switches the front wheel transmission 18 from the standard state to the speed increasing state (step S6). (The above corresponds to the first turning state, the selection means and the check means).

By the speed-up driving of the front wheel 1 as described above, turning on the ridge can be performed quickly and smoothly without damaging the rice field. Is operated to return to the straight traveling position side (step S7), the front cylinder transmission 18 is switched from the speed increasing state to the standard state by the operation cylinder 31 (step S8), and the next planting stroke is started.

Conversely, in step S3, when the operation speed of the steering wheel 32 is lower than the set value and the front wheel 1 is steered by the steering wheel 32 beyond the right or left set angle from the straight traveling position, When the position is detected by the position sensor 33 (step S9), the right or left side brake 34 is operated to the braking release side regardless of the stepping operation of the right or left side brake pedal 36 (step S1).
0), the rear cylinder transmission 15 is switched from the standard state to the deceleration state by the operation cylinder 30 (step S11).
(The above corresponds to the second turning state, the selection means and the check means).

By the deceleration driving of the rear wheel 2 as described above, turning on the ridge can be performed slowly and smoothly without damaging the rice field. When 1 is returned to the straight traveling position side (step S12), the rear wheel transmission 15 is switched from the deceleration state to the standard state by the operation cylinder 30 (step S13), and the next planting stroke is started. .

[Alternative Embodiment] Referring to FIG.
By deleting S10, the side brake pedal 3
In the state where the right or left side brake 34 is operated to the braking side by the stepping operation of No. 6, the front wheel transmission 18 is switched to the speed increasing state by the steering operation of the steering handle 32 (or the rear wheel transmission is changed). The device 15 may be configured to be switched to the deceleration state).

In FIG. 4, steps S1 and S2 are deleted, so that regardless of the depressing operation of the side brake pedal 36,
The front wheel transmission 18 may be configured to be switched to the speed increasing state by the steering operation of the steering handle 32 (or the rear wheel transmission 15 may be switched to the deceleration state). In this case, regardless of the switching operation described above, if the side brake pedal 36 is depressed, the side brake 3
4 is configured to be operated on the braking side.

In the above-described embodiment, the first turning state in which the front wheel transmission 18 is switched to the speed-up state and the second turning state in which the rear wheel transmission 15 is switched to the deceleration state according to the operating speed of the steering handle 32. Although the turning state is configured to be selected, the operator can manually select the first and second turning states in advance by a changeover switch (not shown) according to the skill and preference of the operator. When the front wheel 1 is steered to the right or left set angle by the steering handle 32, the front wheel transmission 18 is switched to the speed increasing state by the operation position of the changeover switch regardless of the operation speed of the steering handle 32. The rear wheel transmission 15 may be configured to be operated or switched to a deceleration state.

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

[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, a rear 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 15 Rear wheel transmission 18 Front wheel transmission 32 Control handle 34 Side brake

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) A01B 69/00 A01C 11/02 331 B60K 17/00-17/36 B62D 11/08

Claims (3)

(57) [Claims] 1. A standard state in which the front wheel (1) and the rear wheel (2) are driven at substantially the same drive speed, and the front wheel (1) is at a higher speed than the current drive speed of the front wheel (1) and the rear wheel (2). A front wheel transmission (18) that can be switched between a speed-up state and a speed-up state; and a standard state and a rear wheel (2) in which the front wheel (1) and the rear wheel (2) are driven at substantially the same drive speed. Is provided with a rear wheel transmission (15) that can be freely switched between a deceleration state in which the front wheels (1) and the rear wheels (2) are driven at a lower speed than the current driving speed, and the front wheels (1) are moved from a straight traveling position. A first turning state in which the front wheel transmission (18) is switched from a standard state to a speed-up state when the steering operation is performed at a right or left set angle or more; When the steering operation is performed beyond the left set angle, the rear wheel transmission (15) is switched from the standard state to the deceleration state. Set the second turning condition, either one of said first turning state and the second turning state
A riding type paddy working machine provided with a selection means for artificially selecting a turning state of the paddy field. 2. The front wheel (1) and the rear wheel (2) have substantially the same drive.
The front wheels (1) driven at speed and the current front wheels
(1) and driven at a speed higher than the driving speed of the rear wheel (2)
The front wheel transmission (18), which can be freely switched to the speed increasing state, and the front wheel (1) and the rear wheel (2) are driven at substantially the same drive speed.
Standard and rear wheels (2) are the current front wheels (1) and rear wheels
Switch to the deceleration state where the motor is driven at a lower speed than the drive speed in (2).
A rear wheel transmission (15) operable to change operation, and a steering handle for artificially steering the front wheel (1)
(32) operation speed detecting means for detecting the operation speed.
The front wheel (1) more than the right or left set angle from the straight-ahead position.
The front wheel transmission (18) is in the standard state
First turning state in which the vehicle is switched from the speed increasing state to the speed increasing state, and the front wheels
(1) Steering from the straight position to the right or left angle or more
When made, the rear wheel transmission (15) is moved from the standard state.
A second turning state in which the operation is switched to a deceleration state is set, and if the operation speed of the steering handle (32) is high, the first turning state is automatically selected, and the operation of the steering handle (32) is performed. A riding type paddy working machine comprising selection means configured to automatically select the second turning state when the operation speed is low. 3. A pair of left and right side brakes (34) capable of independently braking the right and left rear wheels (2), and one of the left and right side brakes (34) is operated on a braking side. The riding paddy working machine according to claim 1 or 2, further comprising a check means for allowing the selection means to operate only when the operation is performed.