WO2019123696A1

WO2019123696A1 - Paddy field work machine

Info

Publication number: WO2019123696A1
Application number: PCT/JP2018/024389
Authority: WO
Inventors: 福永究; 米田達弘; 安田真; 國安恒寿
Original assignee: 株式会社クボタ
Priority date: 2017-12-21
Filing date: 2018-06-27
Publication date: 2019-06-27
Also published as: CN111465314A; KR20200097686A

Abstract

Disclosed is a paddy field work machine wherein motive power output from a transmission 24 is branched in parallel by a branching unit D to a travel transmission system and a work transmission system, the motive power of the travel transmission system is transferred to traveling wheels 1, 2, and the motive power of the work transmission system is transferred to a work device 5 via a continuously variable transmission 45. A motive power adjustment mechanism 67 capable of adjusting the motive power transferred from the transmission 24 to the work transmission system is provided on the side closer to the work transmission system than the branching unit D. The motive power adjustment mechanism 67 operates so that when the motive power output from the transmission 24 is forward motive power for driving the traveling wheels 1, 2 forward, the forward motive power is transferred to the work device 5, and when the motive power output from the transmission 24 is reverse motive power for driving the wheels 1, 2 backward, the reverse motive power is not transmitted to the work device 5.

Description

Paddy work machine

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a paddy field work machine that supplies agricultural materials such as seedlings, seeds, fertilizers, drugs and the like to a dredger scene, such as a riding type rice planter and a riding type direct seeding machine.

Some riding type rice planters, which are an example of a paddy field work machine, have a configuration as disclosed in Patent Document 1. In Patent Document 1, the power of the engine (corresponding to the driving unit) is transmitted to the transmission, the power of the transmission is branched in parallel, and transmitted to the traveling wheels and the seedling planting device (corresponding to the work device). It is done.

As a result, the seedlings are planted in the weir scene by the seedling planting apparatus between the stocks (corresponding to the supply amount) set in advance along the traveling direction of the machine, and the transmission is operated to make the traveling speed of the machine Even if it changes, the power transmitted to the seedling planting device is also the power of the transmission, so the stock spacing by the seedling planting device is maintained at a constant interval.

And the motive power of the transmission is transmitted to the seedling planting apparatus through the inter-train transmission, and by operating the inter-stock transmission, it is possible to set the desired spacing between the plants by the seedling planting apparatus. By changing between stocks, the supply amount of seedlings supplied to the dredging scene is changed.

Japanese Patent Laid-Open Publication No. 2014-070653 (JP2014-070653A)

[Problem 1]
In Patent Document 1, the inter-train transmission is a transmission having a plurality of gear shift positions of a gear shift type. In recent years, there has been a growing demand to appropriately set the supply amount of agricultural materials for the dredging scene according to the status of the dredging scene, agricultural materials and the like.
For example, a continuously variable transmission such as a hydrostatic continuously variable transmission may be provided instead of the gear shift transmission. In this case, the power of the engine (corresponding to the drive unit) is transmitted to the transmission, and the power of the transmission is branched in parallel to the traveling transmission system and the work transmission system, and the traveling transmission system is used for traveling wheels. It can be assumed that the power of the work transmission system is transmitted to the work device through the continuously variable transmission such as the aforementioned hydrostatic stepless transmission. If such a configuration is adopted, the power of various speeds output by the continuously variable transmission is transmitted to the work device, and the supply amount of agricultural materials is finely and appropriately adapted to the condition of the paddy field or agricultural materials, etc. It will be possible to set it to

However, when the power of the transmission is branched in parallel and transmitted to the wheels for traveling and the seedling planting device (corresponding to the work device), the transmission of the transmission works as the paddy work machine moves backward. When the output shaft rotates in the reverse rotation direction opposite to the forward rotation direction, power of the reverse rotation (rotation at reverse) is transmitted not only to the traveling drive system but also to the work transmission system. And when the planting arm of a seedling planting apparatus reversely rotates, a planting arm may fly away in the direction which is not intended.

An object of the present invention is to prevent agricultural materials from being skipped in an unintended direction even when the traveling direction of the vehicle is switched between forward and reverse in a paddy field work machine.

[Problem 2]

In the above-described conventional configuration, since the main transmission transmits power after gear shifting to the wheels for traveling, transmissions in both forward and reverse transmission states are possible to cope with not only forward traveling but also backward traveling. There is a state. However, in the above-described conventional configuration, the inter-shaft transmission is a gear transmission, and power is directly transmitted to the work device not only in the forward rotation transmission state but also in the reverse rotation transmission state.

Heretofore, at the time of backward movement of the vehicle body, a measure has been taken such as switching the working clutch for intermittently transferring power to the working device to the off state so that the reverse rotation power is not transmitted. However, for example, in the case where the disconnection operation of the working clutch is delayed or malfunctions, the reverse rotation power is transmitted to the working device, and proper operation is not performed, which may cause damage. And in order to prevent damage, it was necessary to equip the work apparatus side with a special device for regulating the reverse rotation power.

Therefore, even if the working device is not equipped with a special control device, the amount of agricultural material supplied to the dredging scene is changed and set according to the condition of the field or agricultural material without any risk of damage to the working device. It is demanded to be able to do it.

[Solution 1]
The solution means corresponding to [Problem 1] is as follows.
A transmission to which the power of the driving unit is transmitted;
There is provided a working device for supplying agricultural material to the dredging scene with the supply amount set in advance along the traveling direction of the vehicle.
The power output from the transmission is branched in parallel to the traveling transmission system and the work transmission system at the branching portion, and the power of the traveling transmission system is transmitted to the wheels for traveling, and the power of the work transmission system is absent. Transmitted to the working device through a step change gear,
A power adjustment mechanism capable of adjusting the power transmitted from the transmission to the work transmission system is provided on the work transmission system side with respect to the branch portion,
When the power output from the transmission is the forward power for driving the traveling wheels forward by the operation of the power adjustment mechanism, the forward power is transmitted to the work device and output from the transmission The paddy field work machine which does not transmit the said backward movement power to the said working apparatus, when the driving force is reverse movement power which makes the wheel for driving | running | working drive backward.

According to this configuration, the power of the work transmission system is transmitted to the work device through the continuously variable transmission. That is, power of various speeds output from the continuously variable transmission is transmitted to the work device. As a result, the supply amount of agricultural materials can be set finely and appropriately according to the condition of the paddy field or agricultural materials, etc., and the working accuracy of the paddy field work machine can be improved.

The power of the transmission is branched in parallel to the traveling transmission system and the work transmission system at the branching portion, and the power of the traveling transmission system is transmitted to the wheels for traveling, and the power of the work transmission system is the work device (for example, a seedling When it is transmitted to the planting equipment etc., when the output shaft of the transmission reverses as the paddy field work machine moves backward, not only the traveling drive system but also the power of the reverse rotation not only to the work transmission system It is transmitted. Then, the work device may be driven in the reverse direction, and the work device may perform an unintended work. For example, when the planting arm of the seedling planting device as the working device is reversely rotated, there is a possibility that the seedling may be blown in an unintended direction.
However, as in the present invention, by providing the power adjustment mechanism capable of adjusting the power transmitted from the transmission to the work transmission system on the work transmission system side of the branch part, the power adjustment mechanism operates to output power from the transmission When the power to be driven is forward power for driving the traveling wheels forward, the forward power is transmitted to the work device, and the power output from the transmission is reverse power for driving the traveling wheels backward. After that, forward power can not be transmitted to the working device. That is, in the paddy field work machine, even if the traveling direction of the airframe is switched between forward and reverse, agricultural materials can be prevented from being skipped in unintended directions.

In one preferred embodiment, the continuously variable transmission is a hydrostatic continuously variable transmission including a hydraulic pump and a hydraulic motor,
The power adjustment mechanism includes at least one of an actuator for adjusting an inclination angle of a pump swash plate of the hydraulic pump and an actuator for adjusting an inclination angle of a motor swash plate of the hydraulic motor.

According to this configuration, since the continuously variable transmission is a hydrostatic continuously variable transmission, by adjusting the inclination angle of at least one of the pump swash plate and the motor swash plate of the hydrostatic continuously variable transmission, A fine shift such as shifting the power output from the output unit to a slightly higher speed side or shifting to a slightly lower speed side can be performed without difficulty. Furthermore, by adjusting the inclination angle of at least one of the pump swash plate and the motor swash plate of the hydrostatic continuously variable transmission, it is possible to realize the function of the power adjustment mechanism that does not transmit power to the working device.

In one preferred embodiment, the power adjustment mechanism is provided downstream of the branch portion and upstream of the continuously variable transmission, and forward movement of the output shaft of the transmission when the traveling wheels are forwardly rotated. It has a clutch configured to transmit a driving force to the continuously variable transmission and not to transmit a backward driving force of an output shaft of the transmission to rotate the traveling wheels backward. .

According to this configuration, the clutch may be in one of a state in which the forward drive force of the output shaft of the transmission is transmitted to the continuously variable transmission and in a state in which the reverse drive force of the output shaft of the transmission is not transmitted to the continuously variable transmission. By switching the state, the function of the power adjustment mechanism can be realized.

In one preferred embodiment, the output shaft of the transmission and the input shaft of the continuously variable transmission are coaxially arranged.

According to this configuration, the output shaft of the transmission and the continuously variable transmission are coaxially disposed by coaxially arranging the output shaft of the transmission and the input shaft of the continuously variable transmission to which the power output from the transmission is transmitted. For example, it is not necessary to connect the input shaft with the input shaft using a gear or the like. As a result, by reducing the number of parts, the effect of reducing the weight of the device, the effect of reducing the cost of the device, and the effect of facilitating the assembly of the device can be obtained.

In one preferred embodiment, the branch portion is provided in the middle of the output shaft of the transmission.

According to this configuration, since the power output from the transmission is branched in parallel to the traveling transmission system and the work transmission system in the middle of the output shaft of the transmission, the transmission can transmit power to the traveling transmission system and the work transmission system. The configuration to be transmitted is relatively simple.

In one preferred embodiment, the work device intermittently supplies the agricultural material to the dredger at feed intervals preset along the traveling direction of the vehicle.

According to this configuration, by operating the continuously variable transmission, it is possible to set many supply intervals between the highest speed position and the lowest speed position of the continuously variable transmission device.
As a result, the supply interval can be set finely and appropriately according to the condition of the dredging scene, agricultural materials, etc., and the working accuracy of the paddy field work machine can be improved.

In a preferred embodiment, the working device is provided with a sowing device for point-seeding a seed as an agricultural material on a weir scene at a supply interval previously set along the traveling direction of the airframe.

According to this configuration, it is possible to supply seeds to the weir scene at predetermined supply intervals.

In a preferred embodiment, the working device is provided with a seedling planting device that supplies seedlings as agricultural material to a grazing scene at a supply interval set in advance along the traveling direction of the machine body.

According to this configuration, it is possible to supply the seedlings to the dredging scene at a previously set supply interval.

[Solution 2]
The solution means corresponding to [Problem 2] is as follows.
A first transmission to which power of a driving unit is transmitted;
A working device for supplying agricultural material to a bird's-eye view with a supply amount set in advance along the traveling direction of the vehicle;
A branch portion that branches the power of the first transmission into a traveling transmission system and a work transmission system;
A traveling wheel to which power of the traveling transmission system is transmitted;
A second transmission configured to shift the power of the work transmission system and transmit the power to the work device;
The second transmission is provided with a check mechanism that allows the normal transmission power of the power of the work transmission system to be transmitted to the work device, and also has a check mechanism that suppresses the reverse power to be transmitted to the work device. Paddy working machine being operated.

According to this configuration, the power of the work transmission system of the first transmission is transmitted to the work device through the second transmission, and by operating the second transmission, the shift operation of the second transmission is performed. It is possible to change and set the supply amount of agricultural materials to be supplied to the dredging scene within the range.

For example, when the shift power of the first transmission is set to the normal rotation state, and the work device is performing the supply operation of the agricultural material while the machine body travels forward, the second transmission outputs the reverse power. If it is changed to "1", there is a risk that the working device will not operate properly.

However, according to the present configuration, it is possible to prevent the reverse transmission power from being transmitted from the second transmission to the working device by the check mechanism provided in the second transmission. As a result, no reverse power is output to the working device, and only the normal power can be transmitted without using a special device for restricting the reverse power on the working device side.

Therefore, even if the work device is not equipped with a special control device, the supply amount of agricultural material to the dredged scene is changed according to the condition of the agricultural field and agricultural material without any risk of damage to the work device. It became possible to set it.

In one preferred embodiment, the second transmission is a hydrostatic stepless transmission.
The said check mechanism is comprised by the contact member which carries out contact check control that the shift arm which operates the trunnion axis | shaft in the said hydrostatic continuously variable transmission is operated by reverse rotation operation area.

According to this configuration, since the second transmission is configured as a hydrostatic stepless transmission, the power of the work transmission system can be shifted steplessly. In this manner, by continuously changing the speed, it is possible to set an arbitrary supply amount between the highest speed position and the lowest speed position of the continuously variable transmission according to the working condition, according to the working condition. Can. As a result, the supply amount can be set finely and appropriately according to the condition of the dredging scene, agricultural materials, etc., and the working accuracy of the paddy field work machine can be improved.

The hydrostatic continuously variable transmission can steplessly shift not only the forward rotation power but also the reverse rotation power. Therefore, the transmission arm for operating the trunnion shaft is contact-restrained by the contact member so that the trunnion shaft is operated in the reverse operation area. By mechanically constraining in this manner, it can be reliably avoided that the reverse power is transmitted to the working device.

The contact member may be any member that restricts the gear shift arm and can be of a simple structure. Also, for example, when adopting a configuration in which the transmission arm is operated by the actuator, the reverse rotation power is obtained even if the actuator is operated excessively due to a factor such as a detection error of a sensor that detects the operation state of the trunnion axis. Can be reliably restrained from being transmitted to the working device.

In one preferred embodiment, a gearshift operating tool for changing and operating a gearshift state of the first transmission.
A control device is provided for switching the second transmission to a neutral state when the gearshift operating tool is operated to the reverse travel side.

According to this configuration, when the gearshift operating tool is operated from the operation area on the forward travel side to the reverse travel side, the second shift operation is switched to the neutral state. As the operation to the reverse travel side, for example, the shift operation tool is operated to the lowest speed position (position corresponding to the neutral state) in the operation area on the forward travel side, the shift operation tool is positioned at the neutral operation position And the lowest speed position (position corresponding to the neutral state) in the reverse travel side operation area.

Thus, since the second transmission is switched to the neutral state based on the operation with high probability of being switched to the reverse transmission state before the shift operation tool is actually switched to the reverse transmission state, a slight time delay to the switching operation Even if there is a problem, it can be avoided that the reverse power is transmitted to the working device, and damage to the working device can be prevented.

According to this configuration, the work device intermittently supplies the agricultural material to the dredging scene while leaving an interval as the airframe travels. As the second transmission shifts, the supply amount is changed by changing and setting the interval at which the working device supplies the agricultural material. In this configuration, the entire supply amount can be changed without changing the amount of agricultural materials to be supplied at one time, so the adjustment operation of the supply amount is unnecessary and the correspondence becomes easy.

According to this configuration, it is possible to plant seedlings in a weir scene by the seedling planting device while traveling the machine body, and it becomes easy to manage the planting interval of the seedlings with high accuracy in the seedling planting operation.

According to this configuration, it is possible to point-seed the seeds to the sorrel scene by the sowing device while running the machine body, and it becomes easy to manage the intervals of the point-seeding of the seeds accurately in the sowing operation.

Other features and advantages to be achieved will become apparent from the following description.

It is a figure which shows 1st Embodiment, and is a whole side view of the riding type rice transplanter which is an example of a paddy field working machine (it is the same as the following to FIG. 5). Overall plan view of the riding type rice transplanter Diagram showing the configuration of a traveling transmission system Diagram showing the configuration of work transmission system The figure explaining the state to which the motive power output from a transmission is transmitted to a traveling transmission system and a work transmission system It is a figure which shows 2nd Embodiment, Comprising: The figure corresponding to FIG. It is a figure which shows 3rd Embodiment, and is a whole side view of the riding type rice transplanter which is an example of a paddy field working machine (it is the same as the following until 11). Overall plan view of the riding type rice transplanter Longitudinal back view showing transmission structure Longitudinal back view showing transmission structure Block diagram showing the control configuration

First Embodiment
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. In this embodiment, a riding type rice transplanter is an example of a paddy field work machine that performs a planting operation in a field (paddy field).
Unless stated otherwise, the front-rear direction and the left-right direction are described as follows. When the aircraft 11 travels, the forward traveling direction is "front", and the reverse traveling direction is "rear". The direction corresponding to the right side with respect to the forward posture in the front-rear direction is "right", and the direction corresponding to the left side is "left".

(Overall configuration of riding type rice transplanter)
As shown in FIG. 1 and FIG. 2, the riding type rice transplanter has an airframe provided with right and left front wheels 1 (corresponding to traveling wheels) and right and left rear wheels 2 (corresponding to traveling wheels). A hydraulic cylinder 4 for driving the link mechanism 3 and the link mechanism 3 up and down is provided at the rear of 11 and a seedling planting device 5 (corresponding to a work device) is supported at the rear of the link mechanism 3.

The seedling planting device 5 includes a planting transmission case 6 disposed at a predetermined interval in the left-right direction, a rotation case 7 rotatably supported at the rear right and left portions of the planting transmission case 6, and a rotation case 7 A pair of planting arms 8, a float 9, and a seedling platform 10, etc. are provided at both ends of the vehicle.

Right and left markers 12 are provided on the right and left lateral sides of the seedling planting device 5. The marker 12 is changeable to an action posture (see FIG. 1) to be in contact with the field surface and a storage position away from the field surface, and the rotating body 12a is rotatably supported at the tip of the marker 12. In the action posture of the marker 12, the rotary body 12a of the marker 12 is in contact with the field, and as the airframe 11 travels, the rotary body 12a of the marker 12 forms an index on the field while rotating.

(Configuration around the driving unit)
As shown in FIGS. 1 and 2, the fuselage 11 is provided with a driver's seat 13 and a steering handle 14 for steering the front wheel 1.

Right and left support frames 16 are provided on the right and left portions of the front of the fuselage 11, and a spare seedling platform 15 is supported on the support frame 16. A support frame 17 is connected across the top of the right and left support frames 16.

A measuring device 18 is attached to a portion of the support frame 17 located at the left and right center CL of the airframe 11 in a plan view. The measuring device 18 is provided with a receiving device (not shown) for acquiring position information by a satellite positioning system, and an inertial measurement device (not shown) for detecting the inclination (pitch angle, roll angle) of the airframe 11. The measuring device 18 outputs positioning data indicating the position of the airframe 11.

In a rear axle case 22 that supports the right and left rear wheels 2, an inertial measurement device 19 that measures inertial information is attached to a portion located on the left and right center CL of the vehicle body 11 in plan view. The inertial measurement of the inertial measurement device 19 and the measurement device 18 is configured by an IMU (Inertial Measurement Unit).

Among the above-mentioned satellite navigation systems (GNSS: Global Navigation Satellite System), GPS (Global Positioning System) can be mentioned as a typical example. The GPS is a receiving device of the measuring device 18 using a plurality of GPS satellites orbiting the earth over the earth, a control station performing tracking and control of the GPS satellites, and a receiving device provided with an object (airframe 11) to be measured. It measures the position of

The inertial measurement device 19 includes a gyro sensor (not shown) capable of detecting the angular velocity of the yaw angle of the vehicle body 11, and an acceleration sensor (not shown) capable of detecting acceleration in three axial directions orthogonal to each other. The inertial information measured by the inertial measurement device 19 includes direction change information detected by the gyro sensor and position change information detected by the acceleration sensor.
Thereby, the position of the airframe 11 and the orientation of the airframe 11 are detected by the measuring device 18 and the inertia measuring device 19.

(Configuration around the mission case)
As shown in FIG. 1, a front axle case 21 is supported at the front of the airframe 11 and is connected to the right and left lateral sides of the transmission case 20. Is supported. A rear axle case 22 is supported at the rear of the fuselage 11, and the right and left rear wheels 2 are supported by the rear axle case 22.

As shown in FIG. 1, an engine 23 (corresponding to a driving unit) is supported at the front of the transmission case 20. A hydrostatic-type continuously variable transmission 24 (corresponding to a transmission) is connected to the left lateral side of the transmission case 20, and the power of the engine 23 is input to the continuously variable transmission 24 via the transmission belt 25. It is transmitted to the shaft 24a.

The continuously variable transmission 24 is configured to be continuously and continuously variable-changeable to a neutral position, forward and reverse sides, and operates the continuously variable transmission 24 by a shift lever 30 provided on the left side of the steering handle 14 Do.

(Configuration of traveling transmission system to front and rear wheels)
As shown in FIG. 3, a pump 26 is connected to the right lateral side of the transmission case 20, and the pump 26 supplies hydraulic oil to the hydraulic cylinder 4. The input shaft 24 a of the continuously variable transmission 24 enters the transmission case 20, and the transmission shaft 27 is connected to the input shaft 26 a of the pump 26 and the input shaft 24 a of the continuously variable transmission 24.

The

transmission shafts

28 and 29 are supported along the left-right direction inside the transmission case 20, and the output shaft 24b of the continuously variable transmission 24 is connected to the end of the transmission shaft 28. Inside the transmission case 20, a gear-change-type auxiliary transmission 31 is provided across the

transmission shafts

28 and 29.

The auxiliary transmission 31 includes a low speed gear 32 and a high speed gear 33 connected to the transmission shaft 28, and a shift gear 34 fitted on the transmission shaft 29 integrally rotatably and slidably by a spline structure. The shift gear 34 can be slide operated by an auxiliary shift lever (not shown) provided in the vicinity of the driver's seat 13.

In the auxiliary transmission 31, when the shift gear 34 is engaged with the low speed gear 32, the power of the transmission shaft 28 is transmitted to the transmission shaft 29 at low speed, and when the shift gear 34 is engaged with the high speed gear 33, the power of the transmission shaft 28 is It is transmitted to the transmission shaft 29 at high speed.
When the planting work is performed in the paddy field, the auxiliary transmission 31 is operated at a low speed, and when traveling at high speed on a road or the like, the auxiliary transmission 31 is operated at a high speed.

The right and left front axles 35 for transmitting power to the right and left front wheels 1 are supported across the transmission case 20 and the front axle case 21, and between the right and left front axles 35, a front wheel differential device 36 are provided. The transmission gear 37 connected to the transmission shaft 29 and the transmission gear 38 connected to the case 36 a of the front wheel differential device 36 are engaged with each other.

An output shaft 39 is supported at the rear of the transmission case 20 along the front-rear direction, and a bevel gear 40 connected to the case 36 a of the front wheel differential device 36 and a bevel gear 39 a formed at the front of the output shaft 39 I have an occlusion.

As shown in FIGS. 1 and 3, the transmission shaft 41 is connected to the rear of the output shaft 39 via a universal joint (not shown), and the rear of the transmission shaft 41 is a universal joint (not shown) , And is connected to an input shaft (not shown) of the rear axle case 22.

With the above configuration, the power transmitted by the continuously variable transmission 24 is transmitted from the output shaft 24b of the continuously variable transmission 24 to the transmission shaft 28, the auxiliary transmission 31, the transmission shaft 29, the transmission gears 37 and 38, and the front wheel differential device. It is transmitted to the right and left front wheels 1 via 36 and the front axle 35.
The power transmitted to front wheel differential device 36 is transmitted to right and left rear wheels 2 via bevel gear 40, output shaft 39, transmission shaft 41, and a transmission shaft (not shown) inside rear axle case 22. Ru.

A multi-plate type brake 42 is externally fitted to the output shaft 39, and the pressing member 85 operates by stepping on the brake pedal 43 shown in FIG. 2 and the brake 42 pressed by the pressing member 85 is It can be operated in the braking state. By braking the output shaft 39 with the brake 42, the front wheel 1 and the rear wheel 2 can be braked.

The output shaft 39 is rotatably held by a bearing 87. The bearing 87 has an inner cylindrical portion 87a for holding the output shaft 39, and an outer cylindrical portion 87b positioned on the outer peripheral side of the inner cylindrical portion 87a via a plurality of balls. A collar 88 is provided between the bearing 87 and the component on the pressing member 85 side. The inner cylindrical portion 87a of the bearing 87 comes in contact with the parts on the pressing member 85 side via the collar 88, but the thickness of the collar 88 is between the outer cylindrical portion 87b of the bearing 87 and the parts on the pressing member 85 side. The gap is formed by the length of

The diff lock member 44 is fitted on the left front axle 35 integrally rotatably and slidably by a key structure. By stepping on the diff lock pedal (not shown) provided on the lower side of the driver's seat 13, the diff lock member 44 is slide operated to engage the case 36a of the front wheel diff device 36, whereby the front wheel diff device 36 is It can be operated in the differential lock state.

With the above configuration, the power of the continuously variable transmission 24 (transmission) is branched in parallel to the travel transmission system and the work transmission system, and the power of the travel transmission system is the front wheels 1 and the rear wheels 2 (wheels for travel) It will be transmitted to the

(Configuration of work transmission system to seedling planting device)
As shown in FIG. 4, a hydrostatic continuously variable transmission 45 (corresponding to a continuously variable transmission) is connected to the right lateral side of the transmission case 20, and an input of the hydrostatic continuously variable transmission 45 is provided. The shaft 45a and the transmission shaft 28 are connected. The input shaft 45a of the hydrostatic stepless transmission 45 projects to the opposite side of the transmission case 20, and the fan 46 for sending the cooling air to the hydrostatic stepless transmission 45 is the same as that of the hydrostatic stepless transmission 45. It is connected to the projection of the input shaft 45a.

A transmission shaft 47 is connected to the output shaft 45 b of the hydrostatic continuously variable transmission 45. The

transmission shafts

48 and 49 are supported along the left-right direction in the transmission case 20, and the end of the transmission shaft 49 is supported so as to be relatively coaxial with the transmission shaft 47.

A speed reduction mechanism is provided downstream of the output shaft 45 b (output unit) of the hydrostatic continuously variable transmission 45. In the present embodiment, the reduction gear mechanism is configured using the transmission gear 50 and the transmission gear 51. Specifically, a transmission gear 50 having two sets of gears is rotatably fitted on the outside of the transmission shaft 48. The transmission gear 47a formed on the transmission shaft 47 and the large diameter gear portion 50a of the transmission gear 50 are engaged, and the transmission gear 51 connected to the transmission shaft 49 and the small diameter gear portion 50b of the transmission gear 50 are engaged. ing. The output of the hydrostatic continuously variable transmission 45 is set by appropriately setting the gear ratio of the transmission gear 47a and the large diameter gear portion 50a and the gear ratio of the small diameter gear portion 50b and the transmission gear 51. The rotational speed of the shaft 45 b is reduced and transmitted to the transmission shaft 49.

If it is necessary to lower the rotational speed of the power output by the hydrostatic continuously variable transmission 45 in accordance with the low rotational speed, for example, if the rotational speed is low, for example, if the rotational speed is low. The power of low torque and low speed rotation is output from the output shaft 45 b of the hydrostatic continuously variable transmission 45. In that case, if it is the power of low torque and low speed rotation to be transmitted to the seedling planting device 5, the driving resistance of the seedling planting device 5 may cause the driving of the seedling planting device 5 to stop. is there. However, as in the present embodiment, when the reduction mechanism (transmission gear 50 and transmission gear 51) is provided downstream of the output shaft 45b of the hydrostatic stepless transmission 45, the hydrostatic stepless transmission 45 is provided. Even if the rotational speed of the power output from the output shaft 45b of the vehicle is increased, the power of appropriate torque and rotational speed can be transmitted to the seedling planting device 5 after being decelerated by the reduction mechanism. Thus, by setting the rotational speed of the output shaft 45b of the hydrostatic continuously variable transmission 45 at or above the set rotational speed and increasing the reduction ratio in the reduction mechanism, the traveling speed is low or the seedling planting device 5 Even when the rotation speed required in the above is low, power can be transmitted to the seedling planting device 5 reliably (the planting arm 8 can be reliably driven).

An unequal speed transmission 52 is provided downstream of the reduction mechanism (transmission gear 50 and transmission gear 51) to change the angular velocity of the output power relative to the input power. In the present embodiment, the transmission case 48 is provided with a gear-shift-type unequal-speed transmission 52 in the inside of the transmission case 20, and the first bevel gear 53 is connected to the transmission shaft 48. . The output shaft 54 is supported along the longitudinal direction at the rear of the transmission case 20, and the second bevel gear 55 is externally fitted to the front of the output shaft 54 via the planting clutch 56, and the bevel gears 53 and 55 are engaged. ing.

In other words, the transmission shaft 48 (first shaft) supported in the transmission case 20, and the output shaft 54 (the second shaft) disposed downstream of the transmission shaft 48 in a direction intersecting the transmission shaft 48 in plan view Axis) is provided. The bevel gears 53 and 55 have a first bevel gear 53 provided on the transmission shaft 48 and a second bevel gear 55 provided on the output shaft 54 and meshing with the first bevel gear 53. In addition, the transmission case 20 is formed with an opening AP into which at least the upstream end of the output shaft 54 is inserted, and the diameter of the second bevel gear 55 is set smaller than the diameter of the opening AP. Thus, the diameter of the second bevel gear 55 is set smaller than the opening AP formed in the transmission case 20, so that the second bevel gear 55 and the output shaft 54 can be used without damaging the transmission case 20. Can be taken out of the transmission case 20 through the opening AP.

Further,

bevel gears

53 and 55 for converting the power transmission direction are provided in the work transmission system, and the bevel gears 53 and 55 are provided separately from the reduction mechanism (transmission gear 50 and transmission gear 51). That is, since the bevel gears 53 and 55 do not need to perform shifting (acceleration and deceleration), the diameter of the bevel gears 53 and 55 can be prevented from increasing. Further,

bevel gears

53 and 55 are provided on the downstream side of the hydrostatic continuously variable transmission 45 and the reduction mechanism (the transmission gear 50 and the transmission gear 51), and the power transmission direction is changed. That is, the mechanism in which the gear shift is performed by the hydrostatic continuously variable transmission 45 and the reduction mechanism (transmission gear 50 and transmission gear 51) and the mechanism in which the power transmission direction is converted by the bevel gears 53 and 55 may be divided. it can.

As shown in FIGS. 1 and 4, the transmission shaft 57 is connected to the rear of the output shaft 54 via a universal joint (not shown), and the rear of the transmission shaft 57 is a universal joint (not shown) , And is connected to the input shaft (not shown) of the seedling planting device 5.

With the above configuration, the power shifted by the continuously variable transmission 24 is output from the output shaft 24 b of the continuously variable transmission 24 through the transmission shaft 28 and the input shaft 45 a of the hydrostatic continuously variable transmission 45. It is transmitted to the continuously variable transmission 45.

The power shifted by the hydrostatic stepless transmission 45 is transmitted from the output shaft 45b of the hydrostatic stepless transmission 45 to the transmission shaft 47 (transmission gear 47a), transmission gears 50, 51, transmission shaft 49, unequal It is transmitted to the seedling planting device 5 via the speed change gear 52, the transmission shaft 48, the bevel gears 53 and 55, the planting clutch 56, the output shaft 54, and the transmission shaft 57. The planting clutch 56 transmits power transmission between the second bevel gear 55 and the output shaft 54, or interrupts transmission of power between the second bevel gear 55 and the output shaft 54. Can be switched.

FIG. 5 is a view for explaining a state in which power output from the transmission (stepless transmission 24) is transmitted to the traveling transmission system and the work transmission system. The specific configuration of the continuously variable transmission 24 is not shown. As shown in the drawing, when the shift command on the forward and reverse sides is issued by the shift lever 30, the command is transmitted to the control device 63. Then, based on the command, operation control of the continuously variable transmission 24 and the hydrostatic continuously variable transmission 45 is performed.

Describing the specific example, when the control device 63 receives the forward command issued by the shift lever 30, the output shaft 24b of the continuously variable transmission 24 rotates in the forward rotation direction and at a predetermined rotation speed. As described above, the tilt angle of the pump swash plate of, for example, the hydraulic pump of the continuously variable transmission 24 is adjusted by the actuator. On the other hand, when the control device 63 receives the reverse command issued by the shift lever 30, the output shaft 24b of the continuously variable transmission 24 rotates in the reverse direction to the reverse direction in the forward direction and in the reverse direction. The tilt angle of the pump swash plate of, for example, the hydraulic pump of the continuously variable transmission 24 is adjusted by the actuator so as to rotate at the rotational speed. The power output from the output shaft 24b of the continuously variable transmission 24 is transmitted to the traveling wheels (front wheel 1 and rear wheel 2) via the auxiliary transmission 31 and the like.

Further, in the present embodiment, the branch transmission D at which the power output from the output shaft 24b of the continuously variable transmission 24 is branched in parallel to the traveling transmission system and the work transmission system is provided with the sub transmission 31. It is a site. In this portion, the power of the transmission shaft 28 is branched to the transmission shaft 29 (travel transmission system) by the auxiliary transmission 31, and the power of the transmission shaft 28 is the input shaft 45a of the hydrostatic stepless transmission 45 (work transmission system Is also transmitted to Since the output shaft 24b of the continuously variable transmission 24 and the transmission shaft 28 are coaxial and can be regarded as coaxial, the branch D is provided in the middle of the output shaft 24b of the continuously variable transmission 24. It can be said that In addition, the output shaft 24b of the continuously variable transmission 24 and the input shaft 45a of the hydrostatic continuously variable transmission 45 are arranged coaxially (coaxially). Since the output shaft 24 b of the continuously variable transmission 24 and the input shaft 45 a of the hydrostatic continuously variable transmission 45 to which the power output from the continuously variable transmission 24 is transmitted are coaxially arranged, The output shaft 24b of the transmission 24 and the input shaft 45a of the hydrostatic stepless transmission 45 need not be connected using, for example, gears. As a result, by reducing the number of parts, the effect of reducing the weight of the device, the effect of reducing the cost of the device, and the effect of facilitating the assembly of the device can be obtained.

As shown in FIG. 5, the hydrostatic stepless transmission 45 includes a hydraulic pump 80 and a hydraulic motor 82. The hydraulic pump 80 is provided with a pump swash plate 81, and the hydraulic motor 82 is provided with a motor swash plate 83. In this embodiment, the inclination angle of the pump swash plate 81 of the hydraulic pump 80 can be adjusted by the actuator 67, and the inclination angle of the motor swash plate 83 is fixed. Then, the control device 63 controls the operation of the actuator 67 (that is, adjusts the inclination angle of the pump swash plate 81), whereby the rotational speed of the input shaft 45a in the hydrostatic continuously variable transmission device 45 produces the output shaft 45b. A shift to the rotational speed of the Then, the power output from the output shaft 45 b of the hydrostatic continuously variable transmission 45 is transmitted to the seedling planting device 5 via the transmission shaft 47 and the like.

For example, when carrying out a planting work in a paddy field, the following operations are performed.
At the start of the planting operation, the operator sets (selects) one of a plurality of set stocks by the setting unit (not shown). Then, when the planting work is started in a state where one stock is set by the setting unit, the control device 63 outputs an operation signal corresponding to the set stock, and the hydrostatic stepless is output according to the operation signal. A shift operation by the transmission 45 is performed.

When the planting clutch 56 is operated to the power transmission state, power is transmitted to the seedling planting device 5, and the seedling planting device 5 is operated.
When the seedling planting device 5 is operated, the rotary case 7 is rotationally driven counterclockwise in the plane of FIG. 1 as the seedling platform 10 is driven to reciprocate laterally to the left and right, and two sets of planting arms 8 takes out seedlings (corresponding to agricultural materials) alternately from the lower part of the seedling platform 10 and plant it on the field as a mochi scene. As a result, along the traveling direction of the fuselage 11, the seedlings are intermittently planted and supplied on the field in the supply amount set in advance, that is, between the set stocks (corresponding to the supply interval).
When the planting clutch 56 is operated in the shutoff state, the power to the seedling planting device 5 is shut off, the seedling planting device 5 is stopped, and the seedling platform 10 and the rotation case 7 are stopped.

With the above configuration, the power of the continuously variable transmission 24 (transmission) is branched in parallel to the traveling transmission system and the work transmission system, and the power of the work transmission system is the hydrostatic continuously variable transmission 45 and the unequal speed. The transmission 52 is in a state of being transmitted to the seedling planting device 5 (working device).

In the paddy field construction machine having the above-described configuration, as the paddy field construction machine is moved backward, the output shaft 24b of the continuously variable transmission 24 rotates in the reverse rotation direction, which is opposite to the forward rotation direction. Therefore, when power to rotate in the rotational direction at the time of backward travel is transmitted to the work transmission system, the seedling planting device 5 is also driven in the reverse direction, and for example, the planting arm 8 of the seedling planting device 5 Reverse rotation may cause the seedlings to fly in unintended directions.

However, the paddy field work machine is provided with a power adjustment mechanism capable of adjusting the power transmitted from the continuously variable transmission 24 to the work transmission system on the work transmission system side with respect to the branch portion D. In the present embodiment, the power adjustment mechanism is realized using an actuator 67 that adjusts the inclination angle of the pump swash plate 81 that the hydraulic pump 80 has. That is, by adjusting the inclination angle of the pump swash plate 81 of the hydrostatic continuously variable transmission 45, the function of the power adjustment mechanism that does not transmit power from the hydrostatic continuously variable transmission 45 to the seedling planting device 5 is realizable.

Then, when the power output from the continuously variable transmission 24 is the forward power for driving the traveling wheels (the front wheel 1 and the rear wheel 2) forward, the control device 63 operates by the above-mentioned power adjustment mechanism. When the forward power is transmitted to the seedling planting device 5 and the power output from the continuously variable transmission 24 is a reverse power to drive the traveling wheels (front wheel 1 and rear wheel 2) backward, the above power By the operation of the adjustment mechanism, it is possible to transmit no advancing power to the seedling planting device 5 thereafter. That is, in the paddy field work machine, even if the traveling direction of the airframe 11 is switched between forward and reverse, agricultural materials such as seedlings can be prevented from being skipped in unintended directions.

Specifically, when the control device 63 receives the forward command issued by the shift lever 30, the output shaft 45b of the hydrostatic stepless transmission 45 rotates in the forward rotation direction and at a predetermined rotation speed. The inclination angle of the pump swash plate 81 of the hydraulic pump 80 of the hydrostatic continuously variable transmission 45 is adjusted by the actuator 67 as follows. On the other hand, when the control device 63 receives the reverse command issued by the shift lever 30, the output shaft 45b of the hydrostatic stepless transmission 45 does not rotate or only a very small torque is applied. The inclination angle of the pump swash plate 81 of the hydraulic pump 80 of the continuously variable transmission 45 is adjusted by the actuator 67.

(Configuration of unequal speed transmission)
As shown in FIG. 4, the unequal speed transmission 52 includes a constant speed gear 58 and an unequal speed gear 59 connected to the transmission shaft 49, and a constant speed gear 60 externally fitted to the transmission shaft 48 in a relatively rotatable manner. The inconstant speed gear 61 is provided, and the constant speed gears 58 and 60 are engaged, and the inconstant speed gears 59 and 61 are engaged.

A key-like speed changing member 62 is slidably supported inside the transmission shaft 48, and the speed changing member 62 is slidably operated to be engaged with one of the constant speed gear 60 and the unequal speed gear 61. Thus, the constant velocity gear 60 and the inconstant velocity gear 61 with the transmission member 62 engaged can be connected to the transmission shaft 48.

The constant velocity gears 58 and 60 are circular gears and have the same diameter. Thus, when the transmission member 62 is engaged with the constant velocity gear 60, the power of one rotation of the transmission shaft 49 is transmitted to the transmission shaft 48 as the power of one rotation at the constant velocity state of the angular velocity.

The nonuniform gears 59, 61 are elliptical gears, eccentric gears or non-circular gears. Thereby, when the transmission member 62 is engaged with one of the unequal-speed gears 61, the power of one rotation of the transmission shaft 49 is transmitted to the transmission shaft 48 as the power of one rotation. The angular velocity changes to high and low.

When the inconstant speed gears 59 and 61 are eccentric gears, a plurality of dislocations of the gear teeth are set in one eccentric gear, and the dislocations are set to be different depending on the gear teeth. As a result, it is possible to reduce the variation in backlash of the inconstant speed gears 59 and 61, and the transmission of power by the inconstant speed gears 59 and 61 can be made smooth.

In addition, the rotational speed of the transmission shaft 48 corresponding to the output portion of the unequal speed transmission 52 is the same as the rotational speeds of the output shaft 54 and the transmission shaft 57 transmitted to the seedling planting device 5. In other words, the rotational speed of the transmission shaft 48 does not change while being transmitted to the seedling planting device 5 via the bevel gears 53 and 55, the planting clutch 56, the output shaft 54, and the transmission shaft 57. This is an effect obtained by installing the inconstant speed transmission 52 downstream of the speed reduction mechanism (the transmission gear 50 and the transmission gear 51) and not performing the gear shift downstream of the inconstant speed transmission 52. . With such a configuration, when a state in which the angular velocity changes to high or low in one rotation of the transmission shaft 48 is created by the unequal speed transmission 52, the state is transmitted to the transmission shaft 57 and the seedling planting device 5 as it is. The operation speed of the planting arm 8 of the seedling planting device 5 at the moment when the seedling is supplied to the field can be set to an appropriate value.

Furthermore, in the present embodiment, the planting clutch 56 can shift from the disconnection state to the transmission state only once, that is, once at 360 °, while the second bevel gear 55 and the output shaft 54 make one relative rotation. Is configured as. For example, the output shaft 54 is provided with one claw portion, and the member provided with the second bevel gear 55 is provided with one hollow portion. Then, while the second bevel gear 55 and the output shaft 54 rotate relative to each other relative to each other, the claws of the output shaft 54 may be fitted into one recessed portion in the member provided with the second bevel gear 55 only once. It is in such a positional relationship that it can shift to the power transmission state. Thus, by configuring the planting clutch 56 to shift to the transmission state only when the second bevel gear 55 and the output shaft 54 have a specific positional relationship, the planting clutch 56 is in the transmission state. During the interval, the timing at which the angular velocity changes to high and low among the one rotation on the transmission shaft 48 by the unequal speed transmission 52 and the timing (velocity distribution) at which the angular velocity changes to high and low among one rotation of the planting arm 8 It can be synchronized. As described above, the rotational speed of the shaft is constant between the transmission shaft 48 corresponding to the output portion of the inconstant speed transmission 52 and the seedling planting device 5 (for example, the rotation cycle of the transmission shaft 48 and planting) The rotation cycle of the arm 8 is the same), and the rotational phase of the shaft is also constant. As a result, even if the planting clutch 56 is switched to the transmission state and the disconnection state any number of times, the timing at which the angular velocity changes to high or low within one rotation of the transmission shaft 48, and the angular velocity from high to low within one rotation of the planting arm 8 Is the same as the timing (velocity distribution) changing to.

Second Embodiment
The paddy field work machine of the second embodiment differs from the first embodiment in the configuration of the power adjustment mechanism. Although the paddy field work machine of a 2nd embodiment is explained below, explanation is omitted about the same composition as the above-mentioned embodiment.

FIG. 6 is a diagram for explaining a state in which the power output from the transmission (stepless transmission 24) is transmitted to the traveling transmission system and the work transmission system. The specific configuration of the continuously variable transmission 24 is not shown. Also in the present embodiment, when the shift command on the forward and reverse sides is issued by the shift lever 30, the command is transmitted to the control device 63. Then, when the control device 63 receives the forward movement command performed by the shift lever 30, the continuously variable transmission 24 is rotated such that the output shaft 24b of the continuously variable transmission 24 rotates in the forward rotation direction at a predetermined rotation speed. For example, the inclination angle of the pump swash plate of the hydraulic pump 24 is adjusted by the actuator. On the other hand, when the control device 63 receives the reverse command issued by the shift lever 30, the output shaft 24b of the continuously variable transmission 24 rotates in the reverse direction to the reverse direction in the forward direction and in the reverse direction. The tilt angle of the pump swash plate of, for example, the hydraulic pump of the continuously variable transmission 24 is adjusted by the actuator so as to rotate at the rotational speed.

In addition, in the present embodiment, the hydrostatic stepless transmission is provided in the middle of the transmission shaft 28 coaxially (coaxially) with the output shaft 24b of the continuously variable transmission 24, that is, downstream of the branch portion D. The forward drive force of the output shaft 24b of the continuously variable transmission 24 is transmitted to the hydrostatic stepless transmission 45 upstream of 45 for forward rotation of the traveling wheels (front wheel 1, rear wheel 2), A clutch 84 configured not to transmit the reverse drive force of the output shaft 24b of the continuously variable transmission 24 in the case of rotating the traveling wheels (front wheel 1, rear wheel 2) backwardly to the hydrostatic stepless transmission 45. Is provided as a power adjustment mechanism.

For example, the clutch 84 provided on the transmission shaft 28 can be realized using a one-way clutch. That is, when the clutch 84 is a one-way clutch, when the output shaft 24b of the continuously variable transmission 24 is rotating in the forward rotation direction, the rotation is transmitted to the input shaft 45a of the hydrostatic continuously variable transmission 45 If the output shaft 24b of the continuously variable transmission 24 rotates in the reverse rotation direction opposite to the forward rotation direction, the rotation is transmitted to the input shaft 45a of the hydrostatic continuously variable transmission 45. I will not. As described above, a state in which the forward drive force of the output shaft 24b of the continuously variable transmission 24 is transmitted to the input shaft 45a of the hydrostatic continuously variable transmission 45, and the reverse drive force of the output shaft 24b of the continuously variable transmission 24 The function of the power adjustment mechanism is realized by switching the state of the clutch 84 to any of the states where it does not transmit to the input shaft 45 a of the hydrostatic continuously variable transmission 45.

[Another Embodiment of the First and Second Embodiments]
(1) In the first and second embodiments, the paddy field work machine is a riding type rice transplanter that carries out the planting work in a field (paddy field), but the paddy field working machine may be a riding direct type seeding machine.
Moreover, although the example provided with the seedling planting apparatus 5 which supplies a seedling as an agricultural material to a grazing scene was demonstrated as a working apparatus at the supply interval preset along the running direction of the fuselage 11, The work device may be another device.
For example, the work device may be a sowing device that seeds seeds as agricultural materials at a feed interval set in advance along the traveling direction of the fuselage 11 in a weir scene.

(2) In the transmission case 20, the continuously variable transmission 24 is provided on the right side of the transmission case 20, and the hydrostatic stepless transmission 45 is provided on the left side of the transmission case 20. Good.

(3) Instead of the continuously variable transmission 24, a transmission (not shown) having a plurality of gear shift positions may be provided. In place of the hydrostatic continuously variable transmission 45, a belt continuously variable type continuously variable transmission 45 may be provided.

(4) Inside the transmission case 20, the

transmission shafts

28, 29, 47, 48, 49, etc. may be arranged not in the lateral direction but in the longitudinal direction.
Instead of the engine 23, an electric motor (not shown) may be used as a driving unit.

(5) In the first and second embodiments, an example has been described in which the power adjustment mechanism is realized using the actuator 67 for adjusting the inclination angle of the pump swash plate 81 of the hydraulic pump 80. The function can also be realized by another device.
For example, the power adjustment mechanism includes at least one of an actuator for adjusting the inclination angle of a pump swash plate of a hydraulic pump of the hydrostatic continuously variable transmission 45 and an actuator for adjusting the inclination angle of a motor swash plate of a hydraulic motor. As long as you have
That is, an actuator may be provided to adjust the inclination angle of the motor swash plate 83, and the power adjustment mechanism may be realized by the actuator. Alternatively, in addition to the actuator 67 for adjusting the inclination angle of the pump swash plate 81 of the hydrostatic continuously variable transmission 45, an actuator for adjusting the inclination angle of the motor swash plate 83 is provided, and the power adjustment mechanism It may be realized.

(6) Although the case where the clutch 84 is a one-way clutch was illustrated in 2nd Embodiment, the clutch 84 may be a clutch of the other structure which can switch the state which transmits motive power, and the state which does not transmit. For example, a friction clutch or a claw clutch may be employed as the clutch 84. In this case, when a forward command (shift command) is issued by the shift lever 30, the controller 63 responds to the forward command to drive the forward drive force of the output shaft 24b of the continuously variable transmission 24 into the hydrostatic stepless transmission. When the clutch 84 is operated to transmit power to the transmission 45 and a reverse command (shift command) is issued by the shift lever 30, the control device 63 responds to the reverse command to output the output shaft 24b of the continuously variable transmission 24. The clutch 84 may be operated in the disengaged state so as not to transmit the reverse drive force of the above to the hydrostatic continuously variable transmission 45.

Third Embodiment
The third embodiment will be described below with reference to FIGS. 7 to 11. Also in this embodiment, the riding type rice transplanter is an example of a paddy work machine.
Unless stated otherwise, the front-rear direction and the left-right direction are described as follows. The traveling direction on the forward side during traveling of the traveling vehicle body 111 (corresponding to the vehicle) is "front", and the traveling direction on the reverse side is "rear". The direction corresponding to the right side with respect to the forward posture in the front-rear direction is "right", and the direction corresponding to the left side is "left". That is, the direction shown by the code (F) in FIGS. 7 and 8 is the machine front side, and the direction shown by the code (B) in FIGS. 7 and 8 is the machine rear side. The direction indicated by the symbol (L) in FIG. 8 is the left side of the machine, and the direction indicated by the symbol (R) in FIG. 8 is the right side of the machine.

(Overall configuration of riding type rice transplanter)
As shown in FIG. 7 and FIG. 8, the riding type rice transplanter is equipped with a right and left front wheel 101 (corresponding to a traveling wheel) and a right and left rear wheel 102 (corresponding to a traveling wheel). A link mechanism 103 and a hydraulic cylinder 104 for driving the link mechanism 103 up and down are provided at the rear of the machine body 111, and a seedling planting device 105 (corresponding to a work device) is supported at the rear of the link mechanism 103.

The seedling planting apparatus 105 includes a planting transmission case 106 disposed at a predetermined interval in the left-right direction, a rotation case 107 rotatably supported at the rear right and left portions of the planting transmission case 106, and a rotation case 107 A pair of planting arms 108, a float 109, and a seedling platform 110 are provided at both ends of the

Right and left markers 112 are provided on the right and left lateral sides of the seedling planting device 105. The marker 112 is changeable to a working posture (refer to FIG. 7) to be in contact with the crawling scene G and a storage posture away from the crawling scene G, and the rotating body 112a is rotatably supported by the tip of the marker 112 ing. In the action posture of the marker 112, the rotating body 112a of the marker 112 is in contact with the overhead scene G, and the rotating body 112a of the marker 112 forms an index in the overhead scene G while rotating as the traveling vehicle body 111 travels. .

(Configuration around the driving unit)
As shown in FIGS. 7 and 8, the traveling vehicle body 111 is provided with a driver's seat 113 and a steering handle 114 for steering the front wheel 101.

Right and left vertical support frames 116 are provided on the right and left portions of the front of the traveling vehicle body 111, and a backup seedling platform 115 is supported on the vertical support frames 116. Horizontally oriented support frames 117 are connected across the top of the right and left vertically oriented support frames 116.

A position measurement device 118 is attached to a portion of the laterally oriented support frame 117 located at the left and right center CL of the traveling vehicle body 111 in a plan view. The position measurement device 118 includes a reception device (not shown) for acquiring position information by a satellite positioning system, and an inertial measurement device (not shown) for detecting the inclination (pitch angle, roll angle) of the traveling vehicle body 111. The position measurement device 118 outputs positioning data indicating the position of the traveling vehicle body 111.

In a rear axle case 122 supporting the right and left rear wheels 102, an inertial measurement device 119 for measuring inertial information is attached to a portion located in the left and right center CL of the traveling vehicle body 111 in plan view. The inertial measurement of the inertial measurement device 119 and the position measurement device 118 is configured by an IMU (Inertial Measurement Unit).

Among the above-mentioned satellite navigation systems (GNSS: Global Navigation Satellite System), GPS (Global Positioning System) can be mentioned as a typical example. The GPS uses a plurality of GPS satellites orbiting the earth, a control station that performs tracking and control of the GPS satellites, and a receiver that is provided with an object to be measured (traveling vehicle body 111). It measures the position of the receiving device.

The inertial measurement device 119 includes a gyro sensor (not shown) capable of detecting the angular velocity of the yaw angle of the traveling vehicle body 111, and an acceleration sensor (not shown) capable of detecting acceleration in three axial directions orthogonal to each other. . The inertial information measured by the inertial measurement device 119 includes orientation change information detected by the gyro sensor and position change information detected by the acceleration sensor. As a result, the position measurement device 118 and the inertia measurement device 119 detect the position of the traveling body 111 and the orientation of the traveling body 111.

(Configuration around the mission case)
A transmission case 120 is supported at the front of the traveling vehicle body 111, and right and left front wheels 101 are supported by a front axle case 121 connected to the right and left lateral sides of the transmission case 120. A rear axle case 122 is supported at the rear of the traveling airframe 111, and the right and left rear wheels 102 are supported by the rear axle case 122.

At the front of the transmission case 120, an engine 123 (corresponding to a driving unit) is supported. A first transmission 124 composed of a hydrostatic stepless transmission is connected to the left lateral side of the transmission case 120, and the power of the engine 123 is input to the first transmission 124 via the transmission belt 125. It is transmitted to the shaft 124a.

The first transmission 124 is configured to be continuously steplessly variable on the neutral position, forward and reverse sides, and is provided on the left lateral side of the steering handle 114 (equivalent to a shift operation tool) Thus, the first transmission 124 is operated. To add the description, as shown in FIG. 9, the first transmission 124 integrally accommodates the axial plunger type hydraulic pump 124P and the axial plunger type hydraulic motor 124M in a casing 124C. It is comprised by the hydrostatic continuously variable transmission of a well-known structure.

As shown in FIG. 11, a main transmission lever 130 and a transmission arm 124d for operating a trunnion shaft 124c for operating the swash plate of the hydraulic pump 124P are interlocked and linked by a linkage mechanism 130R. By changing the inclination of the swash plate of the hydraulic pump 124P by operating the main shift lever 130, it is possible to steplessly shift the rotational power.

As shown in FIG. 11, the main shift lever 130 can be rocked in the front-rear direction, and a forward operation area is set on the front side from the neutral position N of the front and rear intermediate portion, and a reverse operation area on the rear side from the neutral position N Is set. The forward travel speed is increased as the main shift lever 130 is pivoted forward from the neutral position N in the forward operation area. As the main shift lever 130 is swung rearward from the neutral position N, the reverse travel speed is increased. The forward operation area and the reverse operation area are shifted in the left-right direction, and the main shift lever 130 can be shifted in the left-right direction between the forward neutral position and the reverse neutral position at the neutral position N. Therefore, it is not possible to swing from the forward operation type to the reverse operation area at once.

(Configuration of traveling transmission system to front and rear wheels)
As shown in FIG. 9, a hydraulic pump 126 is connected to the right lateral side of the transmission case 120, and the hydraulic pump 126 supplies hydraulic oil to hydraulic cylinders 104 and the like. The input shaft 124 a of the first transmission 124 enters the transmission case 120, and the transmission shaft 127 is connected to the input shaft 126 a of the hydraulic pump 126 and the input shaft 124 a of the first transmission 124.

The transmission shaft 128 (corresponding to a branch) and the transmission shaft 129 are supported along the left-right direction in the transmission case 120, and the output shaft 124b of the first transmission 124 is connected to the end of the transmission shaft 128 There is. Inside the transmission case 120, a gear-change-type auxiliary transmission 131 is provided across the transmission shafts 128 and 129.

The auxiliary transmission 131 includes a low speed gear 132 and a high speed gear 133 connected to the transmission shaft 128, and a shift gear 134 externally fitted integrally rotatably and slidably with the transmission shaft 129 by a spline structure. The shift gear 134 can be slid by an auxiliary shift lever (not shown) provided near the driver's seat 113.

In the auxiliary transmission 131, when the shift gear 134 is engaged with the low speed gear 132, the power of the transmission shaft 128 is transmitted to the transmission shaft 129 at low speed, and when the shift gear 134 is engaged with the high speed gear 133, the power of the transmission shaft 128 is transmitted. It is transmitted to the transmission shaft 129 at high speed.
When the planting work is performed in the paddy field, the auxiliary transmission 131 is operated at a low speed, and when traveling at a high speed on a road or the like, the auxiliary transmission 131 is operated at a high speed.

The right and left front axles 135, which transmit power to the right and left front wheels 101, are supported across the transmission case 120 and the front axle case 121, and between the right and left front axles 135 136 are provided. The transmission gear 137 connected to the transmission shaft 129 and the transmission gear 138 connected to the case 136 a of the front wheel differential gear 136 are engaged with each other.

An output shaft 139 is supported at the rear of the transmission case 120 along the front-rear direction, and a bevel gear 140 connected to the case 136 a of the front wheel differential device 136 and a bevel gear 139 a formed at the front of the output shaft 139 I have an occlusion.

As shown in FIG. 7, the transmission shaft 141 is connected to the rear of the output shaft 139 via a universal joint (not shown), and the rear of the transmission shaft 141 is via the universal joint (not shown) , And an input shaft (not shown) of the rear axle case 122.

With the above configuration, the power transmitted by the first transmission 124 is transmitted from the output shaft 124b of the first transmission 124 to the transmission shaft 128, the auxiliary transmission 131, the transmission shaft 129, the transmission gears 137 and 138, and the front wheel differential device. It is transmitted to the right and left front wheels 101 via 136 and the front axle 135.
The power transmitted to front wheel differential gear 136 is transmitted to right and left rear wheels 102 via bevel gear 140, output shaft 139, transmission shaft 141, and a transmission shaft (not shown) inside rear axle case 122. Ru.

The multi-plate type brake 142 is externally fitted to the output shaft 139, and the brake 142 can be operated to the braking state by stepping on the brake pedal 143 shown in FIG. The front wheel 101 and the rear wheel 102 can be braked by braking the output shaft 139 with the brake 142.

A diff lock member 144 is externally rotatably and slidably fitted on the left front axle 135 by a key structure. By stepping on the diff lock pedal (not shown) provided on the lower side of the driver's seat 113, the diff lock member 144 is slide operated to engage the case 136a of the front wheel diff device 136, whereby the front wheel diff device 136 It can be operated in the differential lock state.

With the above configuration, the power of the first transmission 124 is branched in parallel to the travel transmission system and the work transmission system at the transmission shaft 128, and the power of the travel transmission system passes through the auxiliary transmission 131 to the front wheels 101 and It is in a state of being transmitted to the rear wheel 102 (wheel for traveling). Thus, the transmission shaft 128 constitutes a branch.

(Configuration of work transmission system to seedling planting device)
As shown in FIG. 10, the right transmission side of the transmission case 120 is connected to a second transmission 145 which is a hydrostatic stepless transmission. Similar to the first transmission 124, the second transmission 145 is well known in which an axial plunger type hydraulic pump 145P and an axial plunger type hydraulic motor 145M are integrally housed in a casing 145C. It is constituted by a hydrostatic continuously variable transmission of structure. By changing the inclination of a swash plate (not shown) provided in the hydraulic pump 145P, it is possible to steplessly change the rotational power.

The input shaft 145a of the second transmission 145 and the transmission shaft 128 are connected. The input shaft 145a of the second transmission 145 protrudes to the opposite side of the transmission case 120, and the exhaust heat fan 146 for sending the cooling air to the second transmission 145 projects the input shaft 145a of the second transmission 145 It is connected to the department. That is, the fan 146 is provided to rotate integrally with the hydraulic pump 145P.

The transmission shaft 147 is connected to the output shaft 145 b of the second transmission 145. The

transmission shafts

148 and 149 are supported in the left-right direction inside the transmission case 120, and the end of the transmission shaft 149 is relatively rotatably supported coaxially with the transmission shaft 147.

A transmission gear 150 having two sets of gears is rotatably fitted on the outside of the transmission shaft 148. The transmission gear 147a formed on the transmission shaft 147 is engaged with the large diameter gear portion of the transmission gear 150, and the transmission gear 151 connected to the transmission shaft 149 is engaged with the small diameter gear portion of the transmission gear 150. .

Inside the transmission case 120, a gear-shift-type unequal speed transmission 152 is provided across the

transmission shafts

148 and 149, and a bevel gear 153 is connected to the transmission shaft 148. The output shaft 154 is supported along the longitudinal direction at the rear of the transmission case 120, and the bevel gear 155 is externally fitted to the front of the output shaft 154 via the planting clutch 156, and the

bevel gears

153 and 155 are engaged. .

As shown in FIG. 7, the transmission shaft 157 is connected to the rear of the output shaft 154 via a universal joint (not shown), and the rear of the transmission shaft 157 is via a universal joint (not shown) , And an input shaft (not shown) of the seedling planting apparatus 105.

With the above configuration, the power transmitted by the first transmission 124 is transmitted from the output shaft 124 b of the first transmission 124 to the second transmission 145 via the transmission shaft 128 and the input shaft 145 a of the second transmission 145. Transmitted to

The power transmitted by the second transmission 145 is transmitted from the output shaft 145b of the second transmission 145 to the transmission shaft 147 (transmission gear 147a), transmission gears 150 and 151, transmission shaft 149, unequal speed transmission 152, transmission The power is transmitted to the seedling planting device 105 via the shaft 148,

bevel gears

153 and 155, the planting clutch 156, the output shaft 154, and the transmission shaft 157.

When the planting clutch 156 is operated in the transmission state, power is transmitted to the seedling planting device 105, and the seedling planting device 105 is operated.
When the seedling planting device 105 is operated, as shown in FIG. 11, as the seedling platform 110 is driven to reciprocate laterally to the left and right, the rotating case 107 is rotationally driven counterclockwise in FIG. A set of planting arms 108 alternately take out the seedlings A (corresponding to agricultural materials) from the lower part of the seedling platform 110 and plant them on the weir scene G. As a result, the seedlings A are intermittently planted in the drought scene G along the set direction L1 (corresponding to the supply interval) set in advance along the traveling direction F1 of the traveling machine body 111.
When the planting clutch 156 is operated in the shutoff state, the power to the seedling planting device 105 is shut off, the seedling planting device 105 is stopped, and the seedling platform 110 and the rotation case 107 are stopped.

With the above configuration, the power of the first transmission 124 (transmission) is branched in parallel to the traveling transmission system and the work transmission system, and the power of the work transmission system is the second transmission 145 and the unequal speed transmission 152 Of the seedling planting device 105 (working device).

(Configuration of unequal speed transmission)
As shown in FIG. 10, the unequal speed transmission 152 has an equal speed gear 158 connected to the transmission shaft 149, three unequal speed gears 159, and an equal speed externally fitted to the transmission shaft 148 so as to be relatively rotatable. The gear 160 and the three unequal-speed gears 161 are provided, the constant-velocity gears 158 and 160 are engaged, and the three unequal-speed gears 159 and 161 are engaged with each other.

A key-like speed changing member 162 is slidably supported inside the transmission shaft 148, and the speed changing member 162 is slid to engage with the constant speed gear 160 and one of the three unequal speed gears 161. By coupling the transmission member 148, any one of the constant velocity gear 160 and the three unequal velocity gears 161 engaged with the transmission member 162 can be connected to the transmission shaft 148.

The constant velocity gears 158 and 160 are circular gears and have the same diameter. Thus, when the transmission member 162 is engaged with the constant velocity gear 160, the power of one rotation of the transmission shaft 149 is transmitted to the transmission shaft 148 as the power of one rotation at the constant velocity state of the angular velocity.

The unequal speed gears 159 and 161 are an elliptical gear, an eccentric gear or a non-circular gear. Thereby, when the transmission member 162 is engaged with one of the unequal-speed gears 161, the power of one rotation of the transmission shaft 149 is transmitted to the transmission shaft 148 as the power of one rotation. The angular velocity changes to high and low.

When the unequal speed gears 159 and 161 are eccentric gears, a plurality of dislocations of gear teeth are set in one eccentric gear, and the dislocations are set to be different depending on the gear teeth. As a result, it is possible to reduce the variation in backlash of the inconstant speed gears 159 and 161, and the power transmission by the inconstant speed gears 159 and 161 can be made smooth.

(Configuration of control system for operating the continuously variable transmission)
As shown in FIG. 11, the traveling body 111 is provided with a control device 163. A setting unit 164 for setting the set stock L1 is provided in the vicinity of the driver's seat 113 or the steering handle 114, and an operation signal of the setting unit 164 is input to the control device 163.

The setting unit 164 is a type of operation lever operated by the operator artificially, and the operator arbitrarily sets (selects) the set interval L1 steplessly between the maximum interval L11 and the minimum interval L12. Can.

As shown in FIG. 10, the gear toothed rotary body 149a is connected to the transmission shaft 149 so as to rotate integrally. A work rotation speed detection unit 165 of a pickup sensor type is provided for the rotating body 149 a, and a detection value of the work rotation speed detection unit 165 is input to the control device 163.

Thereby, on the downstream side of the second transmission 145 and on the upstream side of the unequal speed transmission 152, the transmission system (transmission shaft 149) between the second transmission 145 and the unequal speed transmission 152 The number of revolutions is detected by the work revolution number detection unit 165 as the number of revolutions of the power from the second transmission 145, and is input to the control device 163.

As shown in FIG. 10, a gear toothed rotor 128 a is connected to the transmission shaft 128 so as to rotate integrally with the transmission shaft 128. A traveling rotation speed detection unit 166 of a pickup sensor type is provided for the rotating body 128 a of the transmission shaft 128, and a detection value of the traveling rotation speed detection unit 166 is input to the control device 163.

As a result, on the upstream side of the auxiliary transmission 131, the traveling rotation speed detection unit 166 that detects the number of rotations of the transmission system between the traveling transmission system and the branch portion (transmission shaft 128) of the operation transmission system and the auxiliary transmission 131. Is in the state of being prepared.

As shown in FIG. 11, a drive mechanism 167 is provided which operates the second transmission 145 by changing the angle of a swash plate (not shown) of the hydraulic pump 145P in the second transmission 145. The operation signal is output to the drive mechanism 167 from the The second transmission 145 is provided with a shift arm 145 d for operating a trunnion shaft 145 c for swash plate operation. The drive mechanism 167 is provided with an electric motor 167A with a reduction gear, a drive arm 167B pivoted by the electric motor 167A, and a rod 167C pivotally connecting the drive arm 167B and the transmission arm 145d. By swinging the drive arm 167B, the transmission arm 145d swings by being pushed and pulled by the rod 167C, and a shift operation is performed. Although not shown, a potentiometer type detection sensor for detecting the swing operation position of the drive arm 167 B is provided, and the detection value of the detection sensor is input to the control device 163.

The control unit 163 includes a slip ratio detection unit 168, a control unit 169, a timer 170, a first travel distance detection unit 171, a second travel distance detection unit 172, and a supply interval detection unit 173 as software.

(Detection of slip ratio of front and rear wheels)
When the planting operation is performed in the paddy field, since the slip occurs on the front wheel 101 and the rear wheel 102, the slip rate of the front wheel 101 and the rear wheel 102 is detected in the slip rate detection unit 168 as described below.

In this case, when the front wheel 101 and the rear wheel 102 slip, the front wheel 101 and the rear wheel 102 are idled, and the traveling machine body 111 is rotated while the front wheel 101 and the rear wheel 102 are rotating. It has not advanced.

In the planting operation, the timer 170 detects a first time point and a second time point after the set time has elapsed from the first time point.
From the first time point to the second time point, based on the detection of the position of the traveling vehicle body 111 and the orientation of the traveling vehicle body 111 by the position measurement device 118 and the inertia measurement device 119, the first traveling distance detection unit 171 actually performs the traveling vehicle body 111 Travel distance is detected. In this case, the detection value of the first traveling distance detection unit 171 includes the slip of the front wheel 101 and the rear wheel 102.

From the first time point to the second time point, the second traveling distance detection unit 172 is determined by the outer diameters of the front wheel 101 and the rear wheel 102 and the detection value of the traveling rotation speed detection unit 166 (rotation speed of the front wheel 101 and the rear wheel 102). Thus, the traveling distance of the traveling vehicle body 111 is detected (calculated). In this case, the front wheel 101 and the rear wheel 102 do not include slips in the detection value of the second traveling distance detection unit 172.

The slip ratio detection unit 168 compares the detection value of the first travel distance detection unit 171 with the detection value of the second travel distance detection unit 172.
When the front wheel 101 and the rear wheel 102 are slipped, the detection value of the first travel distance detection unit 171 is smaller than the detection value of the second travel distance detection unit 172, and the first travel distance detection unit As the difference between the detection values of the second travel distance detection unit 172 and the second travel distance detection unit 172 increases, it can be determined that more slippage of the front wheel 101 and the rear wheel 102 is generated.

Thereby, based on the detection value of the first travel distance detection unit 171 and the detection value of the second travel distance detection unit 172, the slip ratio detection unit 168 detects the slip ratios of the front wheel 101 and the rear wheel 102.
When the slip ratio of the front wheel 101 and the rear wheel 102 from the first time point to the second time point is detected, the slip ratio of the front wheel 101 and the rear wheel 102 from the second time point to the next third time point when the set time has elapsed The detection of the slip ratio of the front wheel 101 and the rear wheel 102 is continuously repeated.

(Setting between stocks at the start of planting work)
When planting work in a paddy field, the following operations are performed.
At the start of the planting operation, the operator sets (selects) the set inter-strain L1 by the setting unit 164. When the planting operation is started in a state where the inter-share L1 is set by the setting unit 164, an operation signal is output from the control unit 169 to the drive mechanism 167 corresponding to the inter-set share L1, and the second transmission 145 is operated. At this time, the position of the drive arm is controlled based on the detection value of the detection sensor.

At this stage, since the slip of the front wheel 101 and the rear wheel 102 is not taken into consideration, the shift position of the second transmission 145 is uniquely determined, and the second transmission 145 is set to the shift position corresponding to the set stock interval L1. Is operated.

Since hydraulic fluid may leak in the second transmission 145, the rotation speed of the output shaft 145b of the second transmission 145 is slightly lower than the rotation speed at the shift position corresponding to the set stock interval L1, The actual inter-stock Lx (corresponding to the supply interval) may be slightly larger than the set inter-stock L1 by this amount.

In this case, the rotational speed of the output shaft 145b of the second transmission 145 corresponds to the set stock L1 interval based on the detection value of the work rotational speed detector 165 (the rotational speed of the output shaft 145b of the second transmission 145). The second transmission 145 is finely adjusted by the drive mechanism 167 in a state where the second transmission 145 is operated to the shift position corresponding to the set stock interval L1 so that the rotational speed is achieved.

(Adjustment between stocks based on detection of front and rear wheel slip ratio in planting work)
As described above, when the second transmission 145 is operated to the shift position corresponding to the set stock interval L1, the slip ratio detection unit 168 causes the slip ratio of the front wheel 101 and the rear wheel 102 as the planting operation progresses. Is detected, and the second transmission 145 is automatically operated as described below so that the actual inter-share Lx becomes the inter-set L1.

Based on the detection value of the work rotation speed detection unit 165 (the rotation speed of the output shaft 145 b of the second transmission 145) and the detection value of the traveling rotation speed detection unit 166 (the rotation speeds of the front wheel 101 and the rear wheel 102) The supply interval detection unit 173 detects an actual inter-strain Lx.
Specifically, a length corresponding to the slip ratio of the front wheel 101 and the rear wheel 102 is calculated, and a length corresponding to the slip of the front wheel 101 and the rear wheel 102 is subtracted from the set stock L1 to obtain an actual stock Lx is detected.

An operation signal is output from the control unit 169 to the drive mechanism 167 so that the actual inter-stock Lx detected by the supply interval detection unit 173 becomes the set-interval stock L1, and the second transmission 145 is operated by the drive mechanism 167.

(Operation of variable speed transmission based on set stock)
When the set interval L1 set by the setting unit 164 is not particularly large and not particularly small, the operator is in a state in which the power by the constant velocity gears 158 and 160 is transmitted in the inconstant speed transmission 152 You may set it.

When the set interval L1 set by the setting unit 164 is set to a particularly large one or a particularly small one, the operator slides the speed change member in the inconstant speed transmission 152, Among the non-uniform speed gears 159 and 161, the non-uniform speed gears 159 and 161 suitable for the set stock L1 set by the setting unit 164 may be selected (only connected to the transmission shaft 148).

When the set strain L1 set by the setting unit 164 is set to a particularly large one, if the constant velocity gears 158 and 160 are used, the planting arm 108 takes out the seedlings A from the seedling stand 110, The rotational speed of the rotating case 107 becomes too slow in the area until the planting of the seedling A to the chewing scene G by the attachment arm 108. Therefore, if the inconstant speed gears 159 and 161 suitable for the set stock L1 are selected, the rotational speed of the rotation case 107 can be slightly increased by the inequal speed transmission 152 in the above-mentioned area, and the seedling A is It can be made to plant on the surface G appropriately.

When the setting strain L1 set by the setting unit 164 is set to a particularly small one, the picking scene G of the seedling A by the planting arm 108 is taken from the removal of the seedling A from the seedling platform 110 by the planting arm 108. The rotational speed of the rotating case 107 becomes too high in the area up to planting. Therefore, if the inconstant speed gears 159, 161 suitable for the set stock L1 are selected, the rotational speed of the rotation case 107 can be slightly reduced by the inequal speed transmission 152 in the above-mentioned area, and the seedlings A It can be made to plant on the surface G appropriately.

(Configuration to check the second transmission)
The second transmission device 145 permits the normal transmission power of the work transmission system to be transmitted to the seedling planting device 105, and controls the reverse power to be transmitted to the seedling planting device 105. A check mechanism K is provided.

Specifically, the check control mechanism K is configured by a contact member 174 that performs a contact check on the shift arm 145d that operates the trunnion shaft 145c in the second transmission 145 so as to be operated in the reverse operation range. That is, as shown in FIG. 11, when the shift arm 145d swings from the neutral position in a predetermined direction (right direction in FIG. 11), the shift to the forward operation range is made. When the shift arm 145 d swings from the neutral position in the direction opposite to the predetermined direction (left direction in FIG. 11), the shift operation region is switched to. In the second transmission 145, the speed change arm 145d is switched to the normal rotation operation region, and the speed of the normal rotation power increases as the swing angle increases. The second transmission 145 can shift such that the speed of the reverse rotation power increases as the shift arm 145d switches to the reverse rotation operation region and the swing angle increases.

However, the contact member 174 is provided at a position where the shift arm 145 d swings from the neutral position to the reverse operation area, and the contact member 174 causes the shift arm 145 d to move to the reverse operation area. It is configured to mechanically contact and check. Therefore, only the forward rotation power is transmitted from the second transmission 145 to the seedling planting device 105, and the reverse rotation power is not transmitted.

Further, the control device 163 is configured to control the drive mechanism 167 so as to switch the second transmission 145 to the neutral state when the main shift lever 130 is operated to the reverse travel side.
As shown in FIG. 11, a lever position sensor 175 comprising a potentiometer for detecting the swing operation position of the main shift lever 130 is provided at the swing fulcrum position of the main shift lever 130. The detection result of the lever position sensor 175 is input to the control device 163.

When the control device 163 detects that the main transmission lever 130 has been operated to the neutral position based on the detection value of the lever position sensor 175, the control device 163 operates the drive mechanism 167 so that the second transmission 145 switches to the neutral state. The neutral position N of the main shift lever 130 may be any one of the lowest speed position N1 of the forward operation area, the lowest speed position N2 of the reverse operation type, or an intermediate position thereof. When the main shift lever 130 is manipulated from the state of being operated in the forward operation area toward the reverse travel side and switched to the neutral position N, the second transmission 145 is switched to the neutral state.

[Another Embodiment of the Third Embodiment]
(1) In the above embodiment, although the check mechanism K is configured by the contact member 174 that performs the contact check on the shift arm 145 d being operated to the reverse operation area, the configuration is replaced with this configuration The drive arm 167B may be brought into contact with the transmission arm 145d and the rod 167c in an interlocking manner so as to control the operation of the drive arm 167B in the reverse operation area. Further, the check mechanism K is not limited to a configuration in which the shift arm 145d and the drive arm 167B are brought into contact with and regulated, and may be configured as follows. For example, in the output portion of the second transmission 145, when the rotating body for output rotates in the forward direction, its rotational power is transmitted to the transmission lower side, and when the rotating body for output rotates in the reverse direction, It may be configured to have a one-way rotation restricting mechanism that does not freely rotate and transmit the power to the transmission lower side.

(2) In the above embodiment, as an example that the main shift lever 130 is operated to the reverse travel side, when the main shift lever 130 is operated to the neutral position N, the second transmission 145 is switched to the neutral state The configuration is such that control is performed, but instead of this configuration, the second transmission 145 may be switched to the neutral state and controlled when the main shift lever 130 is operated reversely.

(3) In the above embodiment, the working device (seedling planting device 105) intermittently supplies the agricultural material (seedling) to the dredger scene at a supply interval set in advance along the traveling direction of the machine. However, instead of this configuration, the working device may be configured to continuously supply the agricultural material to the dredging scene along the traveling direction of the airframe. As described above, when agricultural materials are continuously supplied, it is possible to change and adjust the amount of agricultural materials supplied per unit time when the agricultural materials are continuously supplied by the shift of the second transmission 145.

(4) In the above embodiment, only the seedling planting device 105 as a working device is provided at the rear of the traveling machine body, but instead of this configuration, a field where seedlings are planted by the seedling planting device 105 A fertilizer application device for supplying fertilizer to the surface may be separately provided. And in providing a fertilization apparatus in this way, it is necessary to supply the motive power for a fertilization apparatus in parallel with a seedling planting apparatus. Therefore, the transmission mechanism for driving the fertilization apparatus may be provided inside the transmission case 120.

(5) In the said embodiment, although what applied to the riding type rice transplanter provided with the seedling planting apparatus 105 as a working apparatus was shown, this invention sets beforehand along the traveling direction of an aircraft as a working apparatus. The present invention can be applied to a paddy field work machine (ride type direct seeding machine) equipped with a sowing device for point-seeding seeds as agricultural material at a grazing scene at the supplied intervals. As described above, in the case of application to a passenger-type direct seeding machine, it is possible to change the point seeding interval along the traveling direction when seeding the seed in the weir scene by the speed change operation of the second transmission.

(6) In the said embodiment, although what showed supply of a seedling or a seed | species as an agricultural material was shown, it is good also as a structure which supplies a fertilizer, a chemical | medical agent, etc. to an indigo scene besides it.

First and second embodiments
1: front wheel (wheel for traveling)
2: Rear wheel (wheel for traveling)
5: Seedling planting device (working device)
11: Airframe 23: Engine (motor)
24: Continuously variable transmission (transmission)
24b: Output shaft (output shaft of transmission)
45: Static hydraulic continuously variable transmission (continuously variable transmission)
45a: Input shaft (input shaft of continuously variable transmission)
67: Actuator (power adjustment mechanism)
80: Hydraulic pump 81: Pump swash plate 82: Hydraulic motor 83: Motor swash plate 84: Clutch (power adjustment mechanism)
D: Branch

Third Embodiment
101: front wheel (wheel for traveling)
102: Rear wheel (wheel for traveling)
105: Seedling planting device (working device)
111: Traveling machine (airframe)
123: Engine (motor part)
124: First transmission 128: Transmission shaft (branch)
130: Transmission operating tool 145: Second transmission 145c: Trunnion shaft 145d: Transmission arm 163: Control device 174: Contact member K: Check mechanism

Claims

A transmission to which the power of the driving unit is transmitted;
There is provided a working device for supplying agricultural material to the dredging scene with the supply amount set in advance along the traveling direction of the vehicle.
The power output from the transmission is branched in parallel to the traveling transmission system and the work transmission system at the branching portion, and the power of the traveling transmission system is transmitted to the wheels for traveling, and the power of the work transmission system is absent. Transmitted to the working device through a step change gear,
A power adjustment mechanism capable of adjusting the power transmitted from the transmission to the work transmission system is provided on the work transmission system side with respect to the branch portion,
When the power output from the transmission is the forward power for driving the traveling wheels forward by the operation of the power adjustment mechanism, the forward power is transmitted to the work device and output from the transmission The paddy field work machine which does not transmit the said backward movement power to the said working apparatus, when the driving force is reverse movement power which makes the wheel for driving | running | working drive backward.
The continuously variable transmission is a hydrostatic continuously variable transmission including a hydraulic pump and a hydraulic motor,
The power adjustment mechanism according to claim 1, wherein the power adjustment mechanism comprises at least one of an actuator for adjusting an inclination angle of a pump swash plate of the hydraulic pump and an actuator for adjusting an inclination angle of a motor swash plate of the hydraulic motor. Paddy working machine.
The power adjustment mechanism is provided downstream of the branch portion and upstream of the continuously variable transmission, and the forward drive force of the output shaft of the transmission when the traveling wheel is forwardly rotated is continuously variable. The clutch according to claim 1, further comprising: a clutch configured to transmit to the transmission and not transmit to the continuously variable transmission the reverse driving force of the output shaft of the transmission when rotating the traveling wheels backward. Paddy working machine.
The paddy field work machine according to any one of claims 1 to 3, wherein the output shaft of the transmission and the input shaft of the continuously variable transmission are coaxially disposed.
The paddy field work machine according to any one of claims 1 to 4, wherein the branch portion is provided in the middle of an output shaft of the transmission.
The paddy field work machine according to any one of claims 1 to 5, wherein the work device intermittently supplies the agricultural material to the gravel scene at a supply interval set in advance along the traveling direction of the vehicle.
The paddy field work machine according to claim 6, further comprising: a sowing device for point-seeding a seed as an agricultural material on a grazing scene at a supply interval set in advance along the traveling direction of the fuselage as the working device.
The paddy field work machine according to claim 6, further comprising: a seedling planting device for supplying a seedling as an agricultural material to a reed scene at a supply interval set in advance along the traveling direction of the vehicle as the work device. .
A first transmission to which power of a driving unit is transmitted;
A working device for supplying agricultural material to a bird's-eye view with a supply amount set in advance along the traveling direction of the vehicle;
A branch portion that branches the power of the first transmission into a traveling transmission system and a work transmission system;
A traveling wheel to which power of the traveling transmission system is transmitted;
A second transmission configured to shift the power of the work transmission system and transmit the power to the work device;
The second transmission is provided with a check mechanism that allows the normal transmission power of the power of the work transmission system to be transmitted to the work device, and also has a check mechanism that suppresses the reverse power to be transmitted to the work device. Paddy working machine being operated.
The second transmission is constituted by a hydrostatic stepless transmission;
10. The contact control member according to claim 9, wherein said check mechanism comprises a contact check member for controlling that a shift arm for operating a trunnion shaft in said hydrostatic stepless transmission is operated in a reverse operation area. Paddy working machine.
A shift operating tool for changing and operating the shift state of the first transmission;
11. The paddy field work machine according to claim 9, further comprising: a control device for switching the second transmission to a neutral state when the gearshift operating tool is operated to the reverse travel side.
The paddy field work machine according to any one of claims 9 to 11, wherein the work device intermittently supplies the agricultural material to the gravel scene at a supply interval set in advance along the traveling direction of the vehicle.
The paddy field work machine according to claim 12, further comprising: a seedling planting device for supplying a seedling as an agricultural material to a reed scene at a supply interval set in advance along the traveling direction of the machine as the work device. .
The paddy field construction machine according to claim 12, further comprising: a sowing device for point-seeding a seed as an agricultural material on a grazing scene at a supply interval set in advance along the traveling direction of the fuselage as the working device.