JP3429105B2 - Paddy field 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 construction of a traveling system in a paddy working machine such as a riding type rice transplanter having a seedling planting device connected to a machine body or a riding type direct seeding machine having a direct seeding machine connected to the machine body.

[0002]

2. Description of the Related Art A riding type rice transplanter, which is an example of a paddy working machine, has a structure disclosed in, for example, Japanese Patent Laid-Open No. 3-210102. This paddy work machine is equipped with a belt-type continuously variable transmission (6 in FIG. 1 of the above publication) for traveling, and is used to temporarily suspend the planting work to replenish seedlings. , When the main clutch is operated to the transmission cutoff side to stop the machine and seedling planting device (corresponding to the ground work device), the belt type continuously variable transmission is automatically decelerated to the lowest speed position. (S2 in FIG. 2 of the publication). As a result, when the main clutch is operated to the transmission side when the seedling supply is completed and the planting work is restarted, the aircraft starts with less shock due to the lowest speed position of the belt type continuously variable transmission.

When the planting clutch (corresponding to a working clutch) is operated to the transmission interruption side to stop the seedling planting device at the time of turning at the edge of the ridge, the belt type continuously variable transmission automatically operates as described above. It is configured to be decelerated to the same lowest speed position (S5 and S8 in FIG. 2 of the above publication). As a result, the vehicle body can be swung slowly at the lowest speed position of the belt type continuously variable transmission at the edge of the ridge.

[0004]

The speed range of the above-mentioned belt type continuously variable transmission is not so wide, and it is difficult to set the speed ratio "0" (a state in which power is not transmitted) especially on the low speed side. The lowest speed position is a position that is separated from the position of the gear ratio “0” to the higher speed side to some extent. As a result, when the main clutch is operated to the transmission disengagement side and then to the transmission side again to start the machine from the stopped state, the belt type continuously variable transmission does not have a sufficiently low speed state at the lowest speed position,
Shock may occur when the aircraft starts.

At the time of turning on the ridge, since the aircraft goes straight while turning on the ridge while performing the planting work, the belt type continuously variable transmission should be at least the minimum when turning on the ridge as described above. When the vehicle is decelerated to the high speed position, on the contrary, the traveling speed of the airframe when turning on the edge of the ridge may be too slow.
The present invention, in a paddy work machine, operates the main clutch to the transmission disengagement side and operates again to the transmission side so that the machine body starts with less shock, and the traveling speed of the machine body is too slow when turning at the ridge. The purpose is to configure it so that it does not go into a different state.

[0006]

A feature of the present invention is that the paddy working machine as described above is configured as follows. [1] A main clutch that is capable of transmitting power to and disconnecting power from a ground work device connected to the front and rear wheels for traveling and the machine body,
The lower side of the main clutch is equipped with a work clutch that is capable of transmitting power to the ground work device and controlling transmission / disconnection, and when the main clutch is operated from the transmission side to the transmission cutoff side, the transmission for traveling is automatically operated. When the first deceleration means for decelerating to the predetermined first low speed position and the work clutch are operated from the transmission side to the transmission interruption side, the traveling transmission is automatically decelerated to the predetermined second low speed position. Second deceleration means
And, the operation to change the second low speed position to the low speed side and the high speed side arbitrarily
Possible, and a artificially operable changing means, the second
Set the 1st low speed position to the low speed side rather than the low speed position and change
Depending on the step, the second low speed position is changed to the low speed side and the high speed side.
Even if the first low speed position is lower than the second low speed position,
It is configured to be maintained at a fixed value.

[2] In the configuration of [1] above, the transmission for traveling is hydrostatically
It is composed of a type continuously variable transmission.

[0008]

[I] According to the constitution [1] above, when the main clutch is operated from the transmission side to the transmission interruption side, the traveling transmission automatically decelerates to a predetermined first low speed position. Then, when the work clutch of the ground work device is operated from the transmission side to the transmission interruption side, the traveling transmission is automatically decelerated to the predetermined second low speed position. In this case, since the first low speed position is set to the low speed side of the second low speed position of the traveling transmission, the first low speed position can be set to a sufficiently low speed state. When the main clutch is operated to the power transmission disengagement side and then to the power transmission side again to start the machine body from the stopped state, the machine body can be started with less shock by the first low speed position in a sufficiently low speed state.

On the contrary, the second low speed position is set to the high speed side rather than the first low speed position, and the second low speed position can be set to the low speed state relatively close to the high speed state. When the work clutch is operated to the power transmission disengagement side at the time of turning on the ridge, the state does not occur in which the machine turns at an extremely low speed.

[II] With the configuration described in [1] above, when the traveling speed of the airframe needs to be sufficiently reduced when turning at the ridge due to the depth of the paddy field, the hardness of the mud, etc., the traveling of the airframe In some cases, you can turn without slowing down too much. With this configuration, according to the configuration in [1] above, since the second low speed position can be arbitrarily changed to the low speed side and the high speed side, the operator can change the second low speed position based on the depth of the paddy field and the hardness of the mud. Can be changed to an appropriate one.

[III] When configured as in the above [2], in the case of the configuration in the above [1],
As in the case of the above, it has the “action” described in [I] and [II] above.
In addition to this, it has the following "effects"
It In general, a hydrostatic continuously variable transmission can continuously shift gears from a position with a gear ratio of "0" (a state in which power is not transmitted) to a maximum speed position. As a result, the preceding paragraph
With the configuration of [2] , the first low speed position can be easily set to a sufficiently low speed state close to the gear ratio "0", so that the main clutch is operated to the transmission disengagement side and then to the transmission side again. Then, when the aircraft is started from the stopped state, the aircraft can be smoothly started with less shock.

[0012]

According to the first aspect of the present invention, in the paddy work machine, when the main clutch is operated to the transmission disengagement side and operated again to the transmission side, the machine body can be started with less shock, and at the edge of the ridge. Since it becomes possible to avoid a state in which the traveling speed of the airframe is too slow when turning, it is possible to improve the traveling performance of the paddy working machine and prevent the workability from deteriorating.

According to the first aspect of the present invention, the second low speed position for turning at the ridge can be changed to an appropriate one based on the depth of the paddy field, the hardness of the mud, and the like. It is possible to further prevent the workability of the working machine from being deteriorated.

According to the second aspect of the present invention, the first aspect of the present invention is as follows.
In the same manner as in the case of being configured as described above,
It has an effect. According to the second aspect of the invention , the first low speed position for the main clutch can be easily set to a sufficiently low speed state, and the machine body can be smoothly started with less shock, so that the paddy work machine travels. The performance can be further improved.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a control unit 3 is formed on a machine body supported by front wheels 1 and rear wheels 2, and a link mechanism 4 is connected to a rear portion of the machine body so as to be able to move up and down. Equipped with a seedling planting device 6 at the rear of the link mechanism 4.
By connecting (corresponding to the ground work device), a riding type rice transplanter, which is an example of a paddy work machine, is configured. The power of the engine 20 is transmitted from the main clutch 21 to a hydrostatic continuously variable transmission 15 for traveling (corresponding to a transmission for traveling), which will be described later, to the front wheels 1 and the rear wheels 2, and the seedling planting device 6. Therefore, the planting clutch 8 (corresponding to a working clutch) is provided between the hydrostatic stepless transmission 15 and the seedling planting device 6.

As shown in FIG. 2, a control valve 7 for supplying / discharging hydraulic oil to / from the hydraulic cylinder 5 to expand / contract the hydraulic oil, a motor 9 for transmitting / disconnecting the planting clutch 8 to the transmission / disconnection of the hydraulic clutch 5, the hydraulic cylinder 5 and the plant. The operation lever 10 of the auxiliary clutch 8 is provided, and the operation position of the operation lever 10 is input to the control device 11. A clutch pedal 22 for transmitting and disconnecting the main clutch 21 is provided, and a clutch switch 23 for detecting that the main clutch 21 is operated to the transmission disconnecting side by depressing the clutch pedal 22 is provided. The detection signal of the switch 23 is the control device 1
It is configured to be input to 1.

When the operating lever 10 is operated to the raised position, the neutral position and the lowered position, the control valve 7 is operated to the transmission cutoff side by the motor 9 and the control valve 7 is operated to supply the hydraulic oil, to the neutral position and to the neutral position. When operated to the discharge position, the hydraulic cylinder 5 raises, stops and lowers the seedling planting device 6. When the operation lever 10 is operated to the planting position, the planting clutch 8 is operated to the transmission side by the motor 9, and the control valve 7 is operated so that the seedling planting device 6 is maintained at the set height from the rice field G. Then, the hydraulic cylinder 5 is expanded and contracted to automatically move the seedling planting device 6 up and down, which is a normal planting operation state.

A sensor float 13 is supported in a vertically movable manner around a horizontal axis P1 at the center of the left and right of the seedling planting device 6,
A potentiometer 14 for detecting the vertical angle of the sensor float 13 with respect to the seedling planting device 6 is provided. Thus, at the planting position of the operation lever 10, the height of the seedling planting device 6 with respect to the sensor float 13 that follows the ground contact with the rice field G is detected by the potentiometer 14 as the vertical angle of the sensor float 13 and input to the control device 11. The control valve 7 is operated based on the detection value of the potentiometer 14.

As shown in FIG. 2, an automatic position is provided for the operation lever 10, and when the operation lever 10 is operated to the automatic position, it is completely different from the case where it is operated to the above-mentioned planting position. Similarly, the planting clutch 8 is operated to the transmission side,
The seedling planting device 6 is automatically moved up and down so as to be maintained at a set height from the rice field G. As shown in FIGS. 2 and 1, a lever type lift switch 12 is provided beside the steering handle 18, and when the lift switch 12 is operated once while the operation lever 10 is being operated to the automatic position,
When the seedling planting device 6 is lowered, the planting clutch 8 is operated by the motor 9 to the transmission interruption side, and the hydraulic cylinder 5 raises the seedling planting device 6 to the upper limit. Conversely, when the raising / lowering switch 12 is operated and the seedling planting device 6 is being raised, the seedling planting device 6 is lowered to the rice field G by the hydraulic cylinder 5 to start the automatic raising / lowering operation. The planted clutch 8 is operated by 9 to the transmission side.

As shown in FIGS. 2 and 1, a hydrostatic continuously variable transmission 15 for traveling is provided, an electric cylinder 16 for shifting the hydrostatic continuously variable transmission 15, and a hydrostatic type. A potentiometer 17 for detecting the shift position of the continuously variable transmission 15 is provided. A gear shift lever 19 is provided beside the steering handle 18, and the operation position of the gear shift lever 19 is input to the control device 11. The hydrostatic stepless transmission 15 is configured to continuously and steplessly shift both the forward drive side F and the reverse drive side R with the neutral stop position N interposed therebetween. When operated to an arbitrary operating position on the forward side F and the reverse side R by sandwiching it, the hydrostatic continuously variable transmission 15 by the control device 11 and the electric cylinder 16 is set so as to reach the shift position corresponding to the operation position of the shift lever 19. Is shifted.

Generally, the riding type rice transplanter goes straight along one side of the paddy field to plant seedlings, and when the machine reaches the edge of the ridge, the seedling planting device 6 is largely lifted from the paddy field G to raise the ridge. At this time, the machine is turned 180 ° and the seedling planting device 6 is moved down to the rice field G to start the next planting work. Next, the states before and after the body reaches the edge will be described with reference to FIG.

When planting seedlings, the operating lever 10
To the above-mentioned planting position or automatic position. During this seedling planting work, the seedling stand 24 of the seedling planting device 6 shown in FIG.
When the seedlings of the seedlings become small, the clutch pedal 22 is stepped on and the main clutch 21 is operated to the power transmission disengagement side to stop the airframe and the seedling planting device 6, and a new seedling stand 24 is placed.
Supply to. When the clutch pedal 22 is stepped on in this way to stop the machine body and the seedling planting device 6 (the clutch switch 23 is in the ON state) (step S1), the hydrostatic stepless transmission 15 is operated by the electric cylinder 16. From the shift position corresponding to the operating position of the lever 19, the first low speed position A
The deceleration operation is automatically performed to 1 (step S2) (corresponding to the first deceleration means). As a result, new seedlings are supplied to the seedling stand 24 while the machine body and the seedling planting device 6 are stopped.

When the supply of new seedlings to the seedling stand 24 is completed, the operator operates the clutch pedal 22 to return (the clutch switch 23 is in the OFF state) (step S3) and operates the main clutch 21 to the transmission side. Start the aircraft and restart the seedling planting work. In this case, the above-mentioned first low speed position A1
Is set to a sufficiently low speed close to the neutral stop position N as shown in FIG. 4, so that when the clutch pedal 22 is released and the main clutch 21 is operated to the transmission side, the aircraft smoothly starts with less shock. To go. And the electric cylinder 1
6, the continuously variable transmission 15 is gradually and slowly accelerated from the first low speed position A1 to the shift position corresponding to the operation position of the shift lever 19 (step S4).

Next, when the machine reaches the edge, the operator operates the operating lever 10 at the planting position (or automatic position) to the raised position (step S5) or leaves the operating lever 10 at the automatic position. In this state, the elevating switch 12 is operated once (steps S5, S6, S7). When such an operation is performed, the planting clutch 8 is operated to the transmission interruption side by the motor 9 (step S8), and the seedling planting device 6 located near the rice field G is lifted to the upper limit by the hydraulic cylinder 5. Then, (step S9), the hydrostatic continuously variable transmission 15 is automatically decelerated by the electric cylinder 16 from the shift position corresponding to the operation position of the shift lever 19 to the second low speed position A2 (step S10). (Equivalent to the second deceleration means).

As described above, the seedling planting device 6 is operated to the upper limit, and the hydrostatic stepless transmission 15 is moved to the second low speed position A.
In the state in which the vehicle is decelerated to 2, the operator turns the front wheel 1 by the steering wheel 18 to make a turn at the edge. In this case, since the hydrostatic continuously variable transmission 15 is decelerated to the second low speed position A2, it is possible to smoothly turn the machine body at the edge of the ridge. As shown in FIG. 2, a dial type setting switch 25 (corresponding to a changing unit) is provided, and by operating the setting switch 25 to the standard, high side and low side, as shown in FIG. The second low speed position A2 can be arbitrarily changed to the low speed side and the high speed side. Then, the first low speed position A1 is set so as to be on the low speed side of the lowest position (low position of the setting switch 25) of the changing range of the second low speed position A2.

When the turning operation at the edge is completed and the next planting operation is started, the operating lever 10 in the raised position is operated to the planting position (step S5), or the operating lever 10 is left in the automatic position. In this state, the elevating switch 12 is operated again (steps S5, S6, S7). When such an operation is performed, the seedling planting device 6 that has been raised to the upper limit is lowered to the rice field G by the hydraulic cylinder 5, and the automatic raising / lowering operation is started (step S11), and the motor 9 is used for planting. The auxiliary clutch 8 is operated to the transmission side (step S1
2), the hydrostatic continuously variable transmission 1 using the electric cylinder 16
5 is gradually and slowly accelerated from the second low speed position A2 to the shift position corresponding to the operation position of the shift lever 19 (step S13).

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]

[Fig. 1] Overall side view of the riding rice transplanter

FIG. 2 is a diagram showing a linked state of a speed change lever, an operation lever, a hydraulic cylinder for raising and lowering a seedling planting device, a hydrostatic stepless speed change device, and the like.

FIG. 3 is a diagram showing a flow of control when a clutch pedal is depressed and when a planted clutch is operated to a transmission cutoff side.

FIG. 4 is a diagram showing a relationship between an operating position of a setting switch and first and second low speed positions.

[Explanation of symbols]

1 front wheel 2 rear wheels 6 Ground work device 8 Work clutch 15 Traveling transmission (hydrostatic stepless transmission) 21 Main clutch 25 Change means A1 1st low speed position A2 Second low speed position

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-59418 (JP, A) JP-A-3-210102 (JP, A) JP-A-2-182104 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) A01C 11/02

Claims (2)

(57) [Claims] 1. A main clutch (21) capable of transmitting power to and disconnecting power from a front wheel (1) and a rear wheel (2) for traveling and a ground work device (6) connected to the machine body, and the main clutch (21). On the lower side of the clutch (21), the ground working device (6)
A work clutch (8) capable of transmitting and receiving power to and from the transmission is cut off, and when the main clutch (21) is operated from the transmission side to the transmission cutoff side, the transmission (15) for traveling is automatically operated. When the first deceleration means for decelerating to a predetermined first low speed position (A1) and the work clutch (8) are operated from the transmission side to the transmission interruption side, the traveling transmission (15) is operated. Second deceleration means for automatically decelerating to a predetermined second low speed position (A2)
And the second low speed position (A2) is arbitrarily set to the low speed side and the high speed side.
Change means that can be changed and can be operated artificially (25)
And the first low speed position (A2) rather than the second low speed position (A2).
1) is set to the low speed side, and is changed by the changing means (25).
Change operation of the second low speed position (A2) to low speed side and high speed side
Even if the first low speed position (A1) is set to the second low speed position,
Position (A2) to maintain a constant value on the lower speed side.
Paddy work machine that is made up . 2. The running transmission (15) is hydrostatically
The paddy work machine according to claim 1 , wherein the paddy work machine is constituted by a continuous variable transmission (15) .