JP2019110815A - Paddy field implement - Google Patents

Abstract

To provide a paddy field implement capable of properly setting a supply amount of an agricultural material.SOLUTION: A paddy field implement comprises: a speed changer 24 to which motive force of a prime mover part is transmitted; and a work device for supplying an agricultural material to a field surface at a supply amount which has been set in advance along a travel direction of the machine body. The motive force of the speed changer 24 is branched in a parallel state to a travel transmission system and a work transmission system, the motive force of the travel transmission system is transmitted to wheels for travel, the motive force of the work transmission system is transmitted to the work device through a stepless speed changer 45, and there are provided speed reduction mechanisms 50, 51 on a downstream side of an output part 45b of the stepless speed changer 45.SELECTED DRAWING: Figure 4

Description

  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.

  In Patent Document 1, the 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 space between the plants by the seedling planting apparatus.

JP, 2014-70653, A

  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.

  The present invention makes it possible to appropriately set the supply amount in a paddy field work machine provided with a working device for supplying agricultural materials to a reed scene with the supply amount set in advance along the traveling direction of the airframe. The purpose is.

The paddy field work machine of the present invention is
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 of the transmission is branched in parallel to the traveling transmission system and the work transmission system, the power of the traveling transmission system is transmitted to the wheels for traveling, and the power of the work transmission system is transmitted through the continuously variable transmission. Transmitted to the work device,
A speed reducing mechanism is provided downstream of the output portion of the continuously variable transmission.

  According to the present invention, 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.

If it is necessary to lower the rotational speed of the power output by the continuously variable transmission in accordance with the low rotational speed, for example, if the rotational speed is low, then the continuously variable transmission should be Power of low torque and low speed rotation will be output from the output part of. In this case, if the power transmitted to the work device is power with low torque and low speed rotation, the drive resistance of the work device may stop the drive of the work device.
However, as in the present invention, when the speed reduction mechanism is provided downstream of the output portion of the continuously variable transmission, the speed reduction mechanism is provided even if the rotational speed of the power output from the output portion of the continuously variable transmission is increased. The power of appropriate torque and rotational speed can be transmitted to the work device after decelerating at.

In the present invention,
Preferably, the continuously variable transmission is a hydrostatic continuously variable transmission.

  According to the present invention, since the continuously variable transmission is a hydrostatic stepless transmission, by operating the hydrostatic stepless transmission, the power output from the output portion is shifted slightly to a higher speed side. It is possible to carry out a fine shift, such as shifting to a slightly lower speed side.

In the present invention,
It is preferable that an unequal speed transmission that changes the angular velocity of the output power relative to the input power is provided downstream of the speed reduction mechanism.

  For example, in a riding type rice planter, which is an example of a paddy work machine, when the inter-share (supply amount) of the seedling planting device (working device) is set particularly large or small, operation of the seedling planting device The speed (rotation speed of the planting arm) may be too slow or too fast, and the seedlings may not be properly planted on the field.

According to the present invention, the angular velocity of the power output from the unequal speed transmission changes, for example, during one revolution of the output shaft. That is, regardless of the speed of the power transmitted from the continuously variable transmission to the inconstant speed transmission, the speed of the power transmitted to the work device via the inconstant speed transmission is also high and low, for example, during one rotation. It is possible to change the operating speed of the working device at the moment when the agricultural material is supplied to the dredging scene to an appropriate value.
In addition, the unequal speed transmission is installed downstream of the speed reduction mechanism, and no gear change is performed downstream of the unequal speed transmission. Therefore, if a state in which the angular velocity of the power output from the unequal speed transmission changes, for example, to a height during one rotation of the output shaft is created, the state can be transmitted to the working device as it is.

In the present invention,
Preferably, the work transmission system is provided with a bevel gear for converting the power transmission direction, and the bevel gear is provided separately from the speed reduction mechanism.

  According to the present invention, since it is not necessary to shift the bevel gear, it is possible to avoid an increase in the diameter of the bevel gear.

In the present invention,
It is preferable that the bevel gear is provided downstream of the speed reduction mechanism.

  According to the present invention, the bevel gear is provided on the downstream side of the continuously variable transmission and the reduction mechanism, and the power transmission direction is changed. That is, it is possible to divide the mechanism in which the shift is performed by the continuously variable transmission and the reduction mechanism, and the mechanism in which the power transmission direction is changed by the bevel gear.

In the present invention,
A first axis supported in the transmission case, and a second axis disposed downstream of the first axis along a direction intersecting the first axis in plan view,
The bevel gear has a first bevel gear provided on the first shaft, and a second bevel gear provided on the second shaft and meshing with the first bevel gear.
Preferably, the transmission case is formed with an opening into which at least the upstream end of the second shaft is inserted, and the diameter of the second bevel gear is set smaller than the diameter of the opening.

  According to the present invention, the diameter of the second bevel gear is set smaller than the opening formed in the transmission case. With such a configuration, the second bevel gear and the second shaft can be taken out from the transmission case through the opening without damaging the transmission case.

In the present invention,
It is preferable that the work device intermittently supplies the agricultural material to the dredging scene at a supply interval set in advance along the traveling direction of the vehicle.

According to the present invention, 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 the present invention,
It is preferable that the work device be provided with a sowing device for point-seeding a seed as an agricultural material on a weir scene at a supply interval set in advance along the traveling direction of the machine body.

  According to the present invention, seeds can be supplied to the weir scene at predetermined supply intervals.

In the present invention,
It is preferable that the working device includes a seedling planting device that supplies seedlings as agricultural material to the reed scene at a supply interval set in advance along the traveling direction of the machine.

  According to the present invention, it is possible to supply the seedling to the reeds at preset supply intervals.

It is a whole side view of a riding type rice transplanter. It is a whole top view of a riding type rice transplanter. It is a figure which shows the structure of a traveling transmission system. It is a figure which shows the structure of a work transmission system.

In the embodiment of the present invention, there is shown a riding type rice planter which is an example of a paddy field work machine that carries out a planting operation in a field (paddy field).
The front-rear direction and the left-right direction in the embodiments of the present invention are described as follows unless otherwise specified. 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.

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

  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.

  Although not shown, the hydrostatic stepless transmission 45 includes a hydraulic pump and a hydraulic motor. The rotational speed of the input shaft 45a is controlled by controlling the operation of at least one of an actuator for adjusting the inclination angle of the pump swash plate of the hydraulic pump and an actuator for adjusting the inclination angle of the motor swash plate of the hydraulic motor. A shift from the speed of rotation to the rotational speed of the output shaft 45b is performed.

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 planting work is started in a state in which one space is set by the setting unit, a control device (not shown) outputs an operation signal corresponding to the set space, and the pump swash plate is operated by the operation signal. And, by adjusting the inclination angle of the motor swash plate, the shift operation by the continuously variable 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 rotating case 7 is rotationally driven counterclockwise in the paper surface 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).

(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 also 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.

(First Embodiment of the Invention)
The working apparatus has been described as an example provided with the seedling planting apparatus 5 for supplying the seedlings as agricultural material to the dredging scene at a supply interval set in advance along the traveling direction of the fuselage 11, but the working apparatus As, another device may be provided.
For example, as a work device, a sowing device may be provided which point-seeds seeds as agricultural materials at a feed interval at supply intervals set in advance along the traveling direction of the fuselage 11.

(Second alternative embodiment of the invention)
In the transmission case 20, the continuously variable transmission 24 may be provided on the right lateral side of the transmission case 20, and the hydrostatic stepless transmission 45 may be provided on the left lateral side of the transmission case 20.

(Third alternative embodiment of the invention)
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.

(Fourth alternative embodiment of the invention)
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.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a paddy field work machine that supplies agricultural materials such as seedlings, seeds, fertilizers, drugs and the like to a reed scene, such as a riding type rice planter and a riding type direct seeding machine.

1: front wheel (wheel)
2: Rear wheel (wheel)
5: Seedling planting device (working device)
11: Airframe 20: Mission case 23: Engine (motor part)
24: Continuously variable transmission (transmission)
45: Static hydraulic continuously variable transmission (continuously variable transmission)
45b: Output axis (output section)
48: Transmission shaft (1st axis)
50: Transmission gear (speed reduction mechanism)
51: Transmission gear (speed reduction mechanism)
52: Unequal speed transmission 53: First bevel gear (bevel gear)
54: Output axis (second axis)
55: Second bevel gear (bevel gear)
AP: Opening

Claims (9)

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 of the transmission is branched in parallel to the traveling transmission system and the work transmission system, the power of the traveling transmission system is transmitted to the wheels for traveling, and the power of the work transmission system is transmitted through the continuously variable transmission. Transmitted to the work device,
A paddy work machine provided with a reduction mechanism downstream of an output portion of the continuously variable transmission.   The paddy field work machine according to claim 1, wherein the continuously variable transmission is a hydrostatic continuously variable transmission.   The paddy field work machine according to claim 1 or 2, further comprising an unequal speed transmission that changes the angular velocity of the power output to the input power downstream of the speed reduction mechanism.   The paddy field work machine according to any one of claims 1 to 3, wherein the work transmission system is provided with a bevel gear for converting the power transmission direction, and the bevel gear is provided separately from the reduction gear mechanism.   The paddy field operation machine according to claim 4, wherein the bevel gear is provided downstream of the speed reduction mechanism. A first axis supported in the transmission case, and a second axis disposed downstream of the first axis along a direction intersecting the first axis in plan view,
The bevel gear has a first bevel gear provided on the first shaft, and a second bevel gear provided on the second shaft and meshing with the first bevel gear.
The paddy field according to claim 5, wherein the transmission case is formed with an opening into which at least the upstream end of the second shaft is inserted, and the diameter of the second bevel gear is set smaller than the diameter of the opening. Work machine.   The paddy field work machine according to any one of claims 1 to 6, wherein the work device intermittently supplies the agricultural material to the dredging scene at a supply interval set in advance along the traveling direction of the airframe.   The field work machine according to claim 7, 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 machine as the work device.   The paddy field work machine according to claim 7, 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. .

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