Working machine and paddy field working machine

Abstract

In providing a hydrostatic continuously variable transmission for each of the first driving target device and the second driving target device, hydraulic fluid can be supplied to the continuously variable transmission at a low cost. In addition, in a working machine equipped with a working unit that supplies agricultural materials to the paddy field while rotating vertically between an agricultural material supply unit and the paddy field, the amount of agricultural materials supplied can be appropriately set. In addition, there is a demand for a water-powered work machine capable of smoothly changing the power transmitted to the work device without shift shock. A charge circuit (111) is connected to the drain port (109) of a first hydrostatic continuously variable transmission (32) that outputs toward a first driving target device, and to the charge port (110) of a second hydrostatic continuously variable transmission (35) that outputs toward a second driving target device. The charge circuit (111) supplies the drained fluid discharged from the first continuously variable transmission (32) to the second continuously variable transmission (3) as operating fluid by the discharge pressure of the first continuously variable transmission (32). Additionally, it is equipped with a transmission device (32) that changes the power of the prime mover (4). It is equipped with a power transmission device (S) that divides the change power output by the transmission device (32) into driving power and working power, and has a driving power transmission system (X) that outputs driving power toward the driving device (2, 3) and a working power transmission system (Y) that outputs working power toward the working part (22). In the working power transmission system (Y), a stepless transmission device (35), a reduction mechanism (60), and a working part transmission device (70) that gives the working part (22) a rotational speed of one revolution are provided in the order of transmitting power toward the working part (22). Additionally, the riding type rice transplanter is equipped with a seedling planting device (1005) for planting seedlings on a paddy field, a driving HST (1006) for shifting engine driving power, a weekly HST (1007) for shifting power from the driving HST (1006) and transmitting it to the seedling planting device (1005), a set weekly selection operation unit (1023) for selecting and operating the seedling planting interval S on the paddy field by the seedling planting device (1005) from a plurality of set weekly intervals, and a gear setting unit (1027) for setting the gear of the weekly HST (1007) according to the selected set interval.

Description

Technology Field

[0001] The present invention relates to a working machine.

[0002] In addition, the present invention relates to a working machine for supplying agricultural materials to a paddy field.

[0003] In addition, the present invention relates to a paddy field working machine equipped with a working device for planting seedlings or sowing seeds on the paddy field floor. Background Technology

[0004] For example, as disclosed in Patent Document 1, there is a work vehicle equipped with a hydrostatic continuously variable transmission dedicated to the left rear wheel that drives the left rear wheel, and also equipped with a hydrostatic continuously variable transmission dedicated to the right rear wheel that drives the right rear wheel.

[0005] In addition, regarding a riding type rice transplanter, which is an example of a working machine, there is one disclosed in Patent Document 2. In Patent Document 2, the power of the engine is transmitted to the main transmission device, and the transmission power output, which is shifted by the main transmission device, is divided into driving power and working power, the driving power is transmitted to the front and rear wheels, and the working power is transmitted to the seedling planting mechanism through the working transmission gear.

[0006] Accordingly, even if the travel speed of the machine changes as the main speed gear is operated, the power transmitted to the main planting unit is also the transmission power of the main speed gear; therefore, the interval of the main planting unit is maintained at the set interval set by the work transmission gear. Additionally, the interval of the main planting unit can be changed and set by operating the work transmission gear.

[0007] In addition, as a paddy field worker as described above, a paddy field worker described in Patent Document 3 is already known. Patent Document 3 discloses a paddy field worker (a "rice transplanter" in the document) equipped with a work device for planting rice seedlings on a paddy field (a "planting device [4]" in the document), a transmission device for changing engine driving power (a "main transmission device

[31] " in the document), and a transmission device for changing power from the transmission device and transmitting it to the work device (a "main transmission mechanism

[36] " in the document). Prior art literature

[0008] Japanese Patent Publication No. 2016-55815 Japanese Patent Publication No. 2014-70653 Japanese Patent Publication No. 2005-237281 The problem to be solved

[0009] In a work machine equipped with a first hydrostatic continuously variable transmission that outputs toward a first drive target device, similar to the above-mentioned left rear wheel-only continuously variable transmission, and a second hydrostatic continuously variable transmission that outputs toward a second drive target device, similar to the above-mentioned right rear wheel-only continuously variable transmission, if it is possible to supply hydraulic fluid to each of the first and second continuously variable transmissions by installing a dedicated hydraulic pump and charge circuit for supplying hydraulic fluid to the first continuously variable transmission and a dedicated hydraulic pump and charge circuit for supplying hydraulic fluid to the second continuously variable transmission, the cost becomes high, such as due to an increase in the number of required hydraulic pumps.

[0010] Furthermore, even if the hydraulic pump is configured to be supplied by separating the operating fluid from the hydraulic pump to the first and second continuously variable transmissions via a separation valve to facilitate shared use, a separation valve is required, and a large hydraulic pump with a high discharge flow rate is also necessary, resulting in high costs.

[0011] The present invention provides a work device equipped with a hydrostatic continuously variable transmission for each of a first drive target device and a second drive target device, and capable of supplying hydraulic fluid to both continuously variable transmissions at a low cost.

[0012] In addition, when conventional technology is employed, the interval (supply interval) in the direction of travel of the machine supplying agricultural materials to the paddy field is changed stepwise by a gear transmission. In recent years, there has been an increasing demand to appropriately set the supply interval of agricultural materials according to the characteristics of the paddy field or the agricultural materials.

[0013] The present invention provides a work machine capable of appropriately setting the supply interval of agricultural materials in accordance with the characteristics of the paddy field or agricultural materials.

[0014] In addition, in the water supply work device described in Patent Document 3, since the transmission device for the work device is configured as a gear-type transmission device, there is room for improvement in terms of smoothly performing the transmission of power to the work device without transmission shock.

[0015] Considering the above situation, a water supply work machine capable of smoothly changing the power transmitted to the work device without shift shock is desired. means of solving the problem

[0016] The working device according to the present invention is equipped with a first hydrostatic continuously variable transmission that outputs toward a first driving target device and a second hydrostatic continuously variable transmission that outputs toward a second driving target device, and is equipped with a charge circuit connected to a drain port of the first continuously variable transmission and a charge port of the second continuously variable transmission, and which supplies the discharged fluid from the first continuously variable transmission as operating fluid to the second continuously variable transmission by means of the discharge pressure of the first continuously variable transmission.

[0017] According to this configuration, since the discharged fluid from the first continuously variable transmission is supplied as hydraulic fluid to the second continuously variable transmission by the discharge pressure of the first continuously variable transmission, a hydraulic pump for supplying hydraulic fluid to the first continuously variable transmission needs to be installed, and there is no need to install a dedicated hydraulic pump for the second continuously variable transmission. Furthermore, a smaller hydraulic pump can be used than when a sorting valve is employed.

[0018] Accordingly, a first stepless transmission for a first driving target device and a second stepless transmission for a second driving target device are provided, and hydraulic fluid can be supplied to both stepless transmissions at a low cost.

[0019] In the present invention, a transmission case supporting the first continuously variable transmission device and the second continuously variable transmission device is provided, and it is preferable that the charge circuit is installed by perforating a wall of the transmission case.

[0020] According to this configuration, the charge circuit can be equipped compactly.

[0021] In the present invention, the first continuously variable transmission device and the second continuously variable transmission device are supported on the upper part of the transmission case, and the charge circuit passes through the portion of the wall located on the upper part of the transmission case.

[0022] According to this configuration, the charge circuit is shortened, making it easy to install the charge circuit by drilling it into the mission case.

[0023] In the present invention, it is preferable that a driving device drive case part extending and protruding from the transmission case, a lubrication circuit for extracting lubricating oil from the transmission case and supplying the extracted lubricating oil as operating oil to the first continuously variable transmission, and a drain circuit for discharging the oil from the second continuously variable transmission to the driving device drive case part are provided.

[0024] According to the present configuration, the oil from the second continuously variable transmission passes through the driving device drive case and returns to the transmission case while being cooled in the driving device drive case, making it easier to cool the oil compared to returning it directly to the transmission case.

[0025] In the present invention, it is preferable that the drain circuit is composed of a groove formed on the inner surface of a second wall portion of the mission case and a cover member installed on the inner surface and closing the opening of the groove.

[0026] According to this configuration, forming a groove is easier than drilling and installing a flow path in the second wall of the mission case, making it easier to form a drain circuit.

[0027] In the present invention, it is preferable that the first driving target device is a driving device and the second driving target device is a working device that supplies agricultural materials to packaging.

[0028] In working machines where the work target is packaging and leakage prevention is important, it is easy to prevent leakage by installing a small number of compact hydraulic pumps.

[0029] In the present invention, it is preferable that the transmission power output by the first continuously variable transmission device is branched into driving power and working power, the branched driving power is transmitted to the driving device, and the branched working power is transmitted to the working device through the second continuously variable transmission device.

[0030] According to the present configuration, even if the driving speed is changed by shifting the first continuously variable transmission, the shifting power from the first continuously variable transmission is transmitted to the work device, so that work can be performed without the working condition of the work device changing regardless of the change in driving speed. By shifting the second continuously variable transmission, the driving speed of the work device changes independently of the driving speed, so that the working condition of the work device can be changed independently of the driving speed.

[0031] In the present invention, the working device is preferably a seedling planting device that supplies seedlings as agricultural materials to a package.

[0032] According to the present configuration, seedling planting can be performed without changing the simulated planting conditions regardless of changes in driving speed, or seedling planting can be performed by changing the simulated planting conditions regardless of driving speed.

[0033] In addition, the working machine of the present invention is equipped with a power transmission device having a working unit that supplies agricultural materials to a paddy field while rotating up and down between an agricultural material supply unit and a paddy field, a transmission device that receives power from a prime mover and outputs a transmission power by changing the input power, a branching unit that divides the transmission power output by the transmission device into driving power and working power, a driving power transmission system that outputs driving power from the branching unit toward a driving device, and a working power transmission system that outputs working power from the branching unit toward the working unit, wherein the working power transmission system is equipped with a stepless transmission device, a reduction mechanism, and a working unit transmission device that provides speed control to the rotational speed of one revolution of the working unit.

[0034] According to the present configuration, by operating the stepless transmission device, the speed of the working power transmitted to the working unit is changed steplessly regardless of the speed of the driving power, and the interval (supply interval) in the direction of travel of the machine through which agricultural materials are supplied to the paddy field by the working unit changes steplessly.

[0035] In order to set a wide supply interval, the working power transmitted to the work unit is set to a low speed, so the continuously variable transmission (CVT) can be set to a low-speed transmission state. However, if the CVT is set to a low-speed transmission state that matches the low speed of the working power, low-torque and low-speed power is output from the CVT, and depending on the driving resistance of the work unit, the work unit may not operate smoothly. In addition, depending on the CVT, the CVT may not operate smoothly, such as by vibrating. According to the present configuration, even if the CVT is set to a high-speed transmission state compared to the low speed of the working power to be transmitted to the work unit, the transmission power output by the CVT is reduced by a reduction mechanism and transmitted to the work unit, so the supply interval can be set wide while avoiding malfunctions of the work unit or the CVT.

[0036] In addition, to set a wide supply interval, the operating speed of the working unit can be set to low so that it rotates once at low speed; however, if the operating speed of the working unit is set to low speed only, the elapsed time from when the working unit reaches the paddy field and rises above the paddy field becomes long, and the paddy field is stirred and disturbed over a wide area by the working unit being towed by the machine's movement, causing supply failures such as the agricultural materials to be supplied to the paddy field spreading out or moving away from the designated supply points. To set a narrow supply interval, the operating speed of the working unit can be set to high so that it rotates once at high speed; however, if the operating speed of the working unit is set to high speed only, the elapsed time from when the working unit reaches the paddy field and rises above the paddy field becomes short, causing supply failures such as the agricultural materials to be supplied to the paddy field by the working unit being lifted from the paddy field by the working unit. According to the present configuration, by operating the work unit's gear shifting device in accordance with the set supply interval, the speed of one rotation of the work unit can be varied, and the elapsed time from when the work unit reaches the paddy field floor until it rises relative to the paddy field floor can be adjusted so that it does not become too long or too short, thereby allowing the supply interval to be set wide or narrow while avoiding failure in supplying agricultural materials.

[0037] Therefore, since it is possible to set the supply interval in the direction of gas flow of agricultural materials by finely changing it, the supply interval of agricultural materials can be appropriately set in accordance with the condition of the paddy field or the agricultural materials.

[0038] In the present invention, the continuously variable transmission device is preferably a hydrostatic continuously variable transmission device.

[0039] According to the present configuration, since minor shifting, such as shifting the transmission power output from the transmission device slightly toward the high speed side or slightly toward the low speed side, can be performed without difficulty, it is possible to set the supply interval of agricultural materials by changing it more finely, thereby allowing the supply interval of agricultural materials to be set more appropriately.

[0040] In the present invention, the continuously variable transmission device is provided with an externally fitted drive shaft that is rotatable relative to the output shaft of the continuously variable transmission device, the reduction mechanism is installed across the output shaft and the drive shaft, and it is preferable that an input-side member of the working part transmission device is installed on the drive shaft.

[0041] According to the present configuration, the continuously variable transmission, the reduction gear mechanism, and the working part transmission can be installed in a manner that follows the direction of the output shaft axis of the continuously variable transmission, so the power transmission device can be obtained in a compact manner.

[0042] In the present invention, a transmission case accommodating the work unit transmission device and the reduction gear mechanism is provided, and it is preferable that the transmission case be configured to be divisible into a case body in which the work unit transmission device is located internally and a case cover part in which the reduction gear mechanism is located internally.

[0043] According to the present configuration, when assembling the work unit transmission and reduction gear mechanism into the transmission case, the reduction gear mechanism is positioned in front of the work unit transmission, which requires high-precision phase alignment between the input and output members, and the assembly can be performed while easily observing the work unit transmission, making the assembly process easier.

[0044] In the present invention, the continuously variable transmission device is supported on the outside of the case cover portion, and the output shaft of the continuously variable transmission device comprises an output shaft body that is inserted and penetrates the case cover portion from the outside to the inside, and an extension output shaft that is detachably and incapable of relative rotation and is connected to a portion of the output shaft body located within the transmission case, and it is preferable that the reduction mechanism and the transmission shaft externally fitted to the output shaft so as to be relative rotational are installed on the extension output shaft.

[0045] According to the present configuration, by separating the extended output shaft from the output shaft body, the input side member of the reduction gear mechanism and the working part transmission device can be separated from the continuously variable transmission device together with the extended output shaft, making it easy to perform maintenance such as inspection of the reduction gear mechanism and the working part transmission device.

[0046] In the present invention, it is preferable that a work part clutch is provided, which is installed below the work part transmission device in the direction of transmission and inputs and disconnects power transmission to the work part.

[0047] According to the present configuration, power transmission to the work unit is cut off below the work unit transmission direction to stop the work unit, so when the work unit clutch is disengaged, a fixed-position stop mechanism is equipped that stops the work unit at a specific position during one rotation. Since this can be done without considering the set transmission state of the work unit transmission, it is easy to equip the fixed-position stop mechanism.

[0048] In the present invention, the agricultural material supply unit is preferably a seedling storage unit that stores seedlings as agricultural materials, and the working unit is preferably a seedling planting mechanism that extracts seedlings from the seedling storage unit and supplies the extracted seedlings to the paddy field.

[0049] According to this configuration, rice planting can be performed with the weekly setting finely adjusted.

[0050] In addition, the feature of the present invention is that it comprises a working device for planting seedlings or sowing seeds on a paddy field, a transmission device for changing engine driving force, a stepless transmission device that changes power from the transmission device and transmits it to the working device, a setting interval selection operating unit for selecting and operating a working interval on the paddy field by the working device from a plurality of setting intervals, and a gear stage setting unit for setting the gear stage of the stepless transmission device according to the selected setting interval.

[0051] According to the configuration of the present feature, since the transmission for the work device is configured as a continuously variable transmission, the power transmitted to the work device can be shifted smoothly without shift shock. In addition, while the transmission for the work device is a continuously variable transmission, the correspondence between the setting interval and the gear stage of the continuously variable transmission is clear, thereby improving operability for the operator.

[0052] In addition, in the present invention, it is suitable if a work interval adjustment unit is provided to adjust the work interval according to the actual vehicle speed of the gas.

[0053] According to this feature configuration, the work interval can be adjusted with high precision so that the actual work interval matches the set interval.

[0054] In addition, the present invention is equipped with a receiving device that receives position information from a satellite and a vehicle speed calculation unit that calculates the actual vehicle speed of a vehicle based on the position information received by the receiving device, and the work interval adjustment unit is suitable for adjusting the work interval according to the actual vehicle speed of the vehicle calculated by the vehicle speed calculation unit.

[0055] According to the configuration of the present feature, based on the location information received by the receiving device, the vehicle speed calculation unit immediately calculates the actual vehicle speed of the aircraft, and the work interval adjustment unit adjusts the work interval according to the actual vehicle speed of the aircraft calculated by the vehicle speed calculation unit. By doing so, the work interval can be adjusted with higher precision so that the actual work interval matches the set interval.

[0056] In addition, in the present invention, a wheel rotation speed sensor for detecting the rotation speed of a wheel is provided, and the vehicle speed calculation unit is suitable for calculating the actual vehicle speed of the vehicle based on the detection value of the wheel rotation speed sensor when the receiving device is in poor condition.

[0057] A correlation was confirmed between the detected value of the wheel rotation speed sensor and the actual vehicle speed of the machine. According to this feature configuration, when the receiving device is in poor condition, the wheel rotation speed sensor is used as an alternative means to avoid a situation where the work interval cannot be adjusted.

[0058] In addition, in the present invention, the vehicle speed calculation unit is suitable for calculating the actual vehicle speed of the vehicle based on the detection value of the wheel rotation speed sensor, taking into account a predetermined slip ratio of the wheel.

[0059] According to the configuration of the present feature, the slip ratio of a predetermined wheel is reflected in the actual vehicle speed of the vehicle calculated by the vehicle speed calculation unit, so that the actual vehicle speed of the vehicle can be calculated with high precision.

[0060] In addition, in the present invention, an input rotational speed sensor is provided to detect the rotational speed of the power input to the continuously variable transmission device, and the vehicle speed calculation unit is suitable for calculating the actual vehicle speed of the vehicle based on the detection value of the input rotational speed sensor when the wheel rotational speed sensor is in poor condition.

[0061] A correlation was confirmed between the detected value of the input rotational speed sensor and the actual vehicle speed of the machine. According to the configuration of this feature, when the receiving device and the wheel rotational speed sensor are in poor condition, the situation where the work interval cannot be adjusted can be avoided by using the input rotational speed sensor as an alternative means.

[0062] In addition, in the present invention, the transmission device and the continuously variable transmission device are suitable if they are configured by a hydrostatic continuously variable transmission device.

[0063] According to the configuration of this feature, the power transmitted to the work device can be shifted more smoothly. Brief explanation of the drawing

[0064] Figure 1 is a left side view showing the entire riding-type rice transplanter. Figure 2 is a plan view showing the entire riding-type rice transplanter. Figure 3 is a cross-sectional view of the mission case. Figure 4 is a cross-sectional view of the mission case. Figure 5 is a cross-sectional view of the mission case. Figure 6 is a block diagram illustrating a power transmission device. Figure 7 is an explanatory diagram illustrating the operation of the gear shift key. Figure 8 is a hydraulic circuit diagram. Figure 9 is a plan view illustrating a charge circuit. Figure 10 is a side view illustrating the drain circuit. Figure 11 is a cross-sectional view illustrating a drain circuit. Figure 12 is an explanatory diagram illustrating the structure and operation of a gear shift key. Figure 13 is an explanatory diagram illustrating the structure and operation of a gear shift key. FIG. 14 is a left side view illustrating a riding type rice transplanter. FIG. 15 is a plan view illustrating a riding type rice transplanter. FIG. 16 is a drawing illustrating a control block. Specific details for implementing the invention

[0065] Hereinafter, an embodiment of the present invention applied to a riding-type rice transplanter as an example of a working device will be described based on the drawings.

[0066] [Regarding the overall composition of the riding-type rice transplanter]

[0067] In the following description, regarding the body (1) of the riding type rice transplanter, the direction of arrow F shown in FIGS. 1 and 2 is referred to as the "front of the body," the direction of arrow B as the "rear of the body," the direction of arrow R shown in FIG. 2 as the "right of the body," and the direction of arrow L as the "left of the body."

[0068] As illustrated in FIGS. 1 and 2, the riding type rice transplanter is equipped with a body (1) in which right and left front wheels (2) as driving devices are steerable and drivable, and right and left rear wheels (3) as driving devices are drivable. A driving unit (5) having an engine (4) as a prime mover is formed in the front part of the body (1). A riding type driving unit (8) having a driver's seat (6) and a steering wheel (7) for steering the front wheels (2) is formed in the rear part of the body (1). The steering operation of the front wheels (2) by the steering wheel (7) is performed through a torque generator (100) (see FIG. 8) as a power steering device.

[0069] A seedling device (20) serving as a work device is connected to the rear part of the body (1) through a link mechanism (9). The seedling device (20) is operated to move up and down between a lowered working state and an upward non-working state by the up-and-down oscillation operation of the link mechanism (9) relative to the body (1). The oscillation operation of the link mechanism (9) relative to the body (1) is performed by the extension and retraction operation of a hydraulic lifting cylinder (101). A spare seedling storage device (10) is installed on both the left and right sides of the front part of the body (1). Each of the left and right spare seedling storage devices (10) is equipped with three spare seedling stacks (11). The three spare seedling stacks (11) are capable of switching between an extended state for use, arranged in a line along the front-rear direction of the body (1), and a folded state, stacked in three upper and lower sections. An antenna unit (13) for satellite navigation is supported across the support (12) of the left-hand reserve seedling storage device (10) and the support (12) of the right-hand reserve seedling storage device (10). A fertilizer application device (14) is installed in the rear part of the body (1). When seedling planting is performed by the seedling planting device (20), it is possible to supply fertilizer near the seedlings to be planted by the fertilizer application device (14).

[0070] Additionally, as illustrated in FIGS. 1 and 2, the riding type rice transplanter is equipped with a body (1) in which right and left front wheels (2) as driving devices are steerable and drivable, and right and left rear wheels (3) as driving devices are drivable. A driving unit (5) having an engine (4) as a prime mover is formed in the front part of the body (1). A riding type driving unit (8) having a driver's seat (6) and a steering wheel (7) for steering the front wheels (2) is formed in the rear part of the body (1).

[0071] A model planting device (20) is connected to the rear part of the body (1) through a link mechanism (9). The model planting device (20) is operated to move up and down between a lowered working state and an upward non-working state by the up-and-down oscillating operation of the link mechanism (9) relative to the body (1). A spare model storage device (10) is installed on both the left and right sides of the front part of the body (1). Each of the left and right spare model storage devices (10) is equipped with three spare model loading platforms (11). The three spare model loading platforms (11) are capable of switching between an extended state for use, arranged in a line along the front-rear direction of the body (1), and a folded state, stacked in three vertical layers. An antenna unit (13) for satellite navigation is supported across the support (12) of the left spare model storage device (10) and the support (12) of the right spare model storage device (10). A fertilizer application device (14) is installed at the rear of the machine (1). When seedling planting is performed by the seedling planting device (20), it is possible to supply fertilizer near the seedlings to be planted by the fertilizer application device (14).

[0072] [Regarding the configuration of the model planting device (20)]

[0073] As shown in FIGS. 1 and 2, the planting unit device (20) is equipped with a planting unit (20A) composed of four planting drive cases (21) arranged spaced apart in the horizontal width direction of the unit (1). A planting unit mechanism (22) as a working unit is installed on both horizontal sides of the rear portion of each of the four planting drive cases (21). A total of eight planting unit mechanisms (22) are installed. Each of the eight planting unit mechanisms (22) is equipped with a rotating rotor (22a) rotatably supported on the planting drive case (21) in the manner shown in FIGS. 2 and 6, and a planting arm (22b) rotatably supported on each end portion of the rotating rotor (22a). A planting hook (22c) is provided on each of the pair of planting arms (22b).

[0074] A seedling stack (23) serving as an agricultural material supply unit is installed above the front portion of the planting machine (20A). As shown in FIG. 2, eight seedling stacks (23a) are formed on the seedling stack (23), each corresponding to one of the eight seedling planting mechanisms (22). That is, seedlings supplied to the eight seedling planting mechanisms (22) are arranged in the width direction of the planting machine (20A) and stored on the seedling stack (23). A seedling vertical conveyor belt (24) is installed on each of the eight seedling stacks (23a).

[0075] When the seedling planting device (20) is lowered to a lowering operation state and operated to a driving state, power from the engine (4) is transmitted to the feed case (25) (see FIG. 1) supported on the front part of the planting machine (20A), and is input from the feed case (25) to each of the four planting drive cases (21), and each of the eight seedling planting mechanisms (22) is driven by the power of the planting drive cases (21) to perform rotational movement for the seedling planting between the lower side of the seedling loading platform (23) and the paddy field. When the seedling planting mechanism (22) rotates, the planting hooks (22c) of a pair of planting arms (22b) alternately rotate up and down between the seedling extraction port formed by the guide rail (26) on the lower side of the seedling stacking platform (23) and the paddy field floor, and each planting hook (22c) of the pair of planting arms (22b) extracts seedlings for planting from the seedlings of the seedling stacking platform (23) at the seedling extraction port, and the extracted seedlings for planting are lowered and conveyed to be planted on the paddy field floor.

[0076] A seedling horizontal transport mechanism (not shown) installed across the seedling stacking platform (23) and the feed case (25) is driven by the power of the feed case (25) in conjunction with the rotational movement of the seedling planting mechanism (22), and the seedling stacking platform (23) is reciprocated in the horizontal width direction of the planting body (20A) by the seedling horizontal transport mechanism in conjunction with the rotational movement of the seedling planting mechanism (22). As a result, seedlings loaded in each of the eight seedling stacking platforms (23a) are reciprocated in the horizontal direction relative to the seedling planting mechanism (22), and each of the eight seedling planting mechanisms (22) sequentially extracts seedlings for planting from one end side to the other end side in the horizontal width direction of the seedlings loaded in the seedling stacking platform (23a).

[0077] When the seedling stacking platform (23) reaches the stroke end of the left and right horizontal transport, a seedling vertical transport mechanism (not shown) installed across the seedling stacking platform (23) and the feed case (25) is driven by the power of the feed case (25), and each seedling vertical transport belt (24) of the eight seedling stacking sections (23a) is driven by the seedling vertical transport mechanism (not shown). That is, whenever the seedling stacking platform (23) reaches the stroke end of the left and right horizontal transport, the seedlings stacked in each of the eight seedling stacking sections (23a) are transported vertically by the seedling vertical transport belt (24) toward the seedling planting section mechanism (22) by an amount corresponding to the length of the seedlings in the vertical direction of the seedlings to be planted by the seedling planting section mechanism (22).

[0078] In the seedling planting device (20), as the machine (1) travels in a lowered state, the eight seedling planting mechanisms (22), seedling loading platform (23), and seedling longitudinal conveyor belt (24) are driven by power transmitted from the engine (4) to the feed case (25), and the seedling planting of eight rows is performed by the eight seedling planting mechanisms (22). The seedling planting of one row by each of the eight seedling planting mechanisms (22) is performed as a weekly D (see FIG. 6) by the alternating planting of a pair of planting hooks (22c). The weekly D is the planting interval in the direction of travel of the machine (1).

[0079] [Regarding the composition of power transmission]

[0080] As shown in FIG. 1, a transmission case (30) is installed at the rear of the engine (4). The transmission case (30) forms the front part of the body (1). As shown in FIG. 3, front wheel drive case parts (31) as driving device drive case parts extend outward from the lower side of the transmission case (30) toward the side of the body. The transmission case (30) rotatably supports the left and right front wheels (2) by means of the left and right front wheel drive case parts (31).

[0081] Additionally, as shown in FIG. 1, a mission case (30) is installed at the rear of the engine (4). The mission case (30) forms the front part of the aircraft (1). As shown in FIG. 3, front wheel drive case sections (31) extend outward toward the side of the aircraft from both side sections of the lower part of the mission case (30). The mission case (30) rotatably supports the left and right front wheels (2) by means of the left and right front wheel drive case sections (31).

[0082] As illustrated in FIGS. 3 and 4, a first continuously variable transmission (32) of a hydrostatic type, serving as a transmission device for driving and working, is supported in a transmission case (30). The first continuously variable transmission (32) is supported in the upper left side outer portion of the transmission case (30). As illustrated in FIG. 1, the output shaft of the engine (4) and the input shaft (32a) of the first continuously variable transmission (32) (see FIG. 3) are connected in conjunction by a power transmission belt (33). Power from the engine (4) is input to the first continuously variable transmission (32) by the power transmission belt (33). The input shaft (32a) of the first continuously variable transmission (32) is a pump shaft provided in the hydraulic pump constituting the first continuously variable transmission (32).

[0083] In the first stepless transmission (32), the shift operating shaft (32b) (see FIG. 3), which is rotatably supported in the casing, is rotated so that the angle of the inclined plate of the hydraulic pump (not shown) is changed, thereby shifting to a neutral shift state, a forward shift state, and a reverse shift state. When the first stepless transmission (32) shifts to a neutral shift state, the output shaft (32c) (see FIG. 3) of the first stepless transmission (32) stops. The output shaft (32c) of the first stepless transmission (32) is a motor shaft provided in the hydraulic motor constituting the first stepless transmission (32). When the first stepless transmission (32) shifts to a forward shift state, power from the engine (4) is converted into forward power by the hydraulic pump and hydraulic motor, and is also output from the output shaft (32c) as shift power with a stepless rotational speed. When the first stepless transmission device (32) is shifted to a reverse side shift state, power from the engine (4) is converted into reverse power by a hydraulic pump and a hydraulic motor, and also output from the output shaft (32c) as stepless shifted power.

[0084] As illustrated in FIG. 4, a second continuously variable transmission (35) of the hydrostatic type is supported in the transmission case (30) as a working continuously variable transmission. The second continuously variable transmission (35) is supported in the upper right side outer portion of the transmission case (30). A cooling fan (36) is supported so as not to rotate relative to the part of the input shaft (35a) of the second continuously variable transmission (35) that protrudes out of the housing. The input shaft (35a) of the second continuously variable transmission (35) is a pump shaft provided in the hydraulic pump constituting the second continuously variable transmission (35).

[0085] As shown in FIGS. 3 and 4, a branch shaft (37) serving as a branching section, a driving auxiliary transmission device (40), a front wheel differential mechanism (50), a working reduction mechanism (60), and a working section transmission device (70) are installed inside the transmission case (30). As shown in FIG. 3, a rear wheel output shaft (80) is rotatably supported on a first output boss section (30c) formed in the rear part of the transmission case (30). As shown in FIG. 4, a working output shaft (89) is rotatably supported on a second output boss section (30d) formed in the rear part of the transmission case (30). A working section clutch (90) is installed in the part of the working output shaft (89) located inside the second output boss section (30d).

[0086] As illustrated in FIG. 6, a driving and working power transmission device (S) is configured by means of a branch shaft (37), an auxiliary transmission device (40), a second continuously variable transmission device (35), a reduction mechanism (60), a working part transmission device (70), and a working part clutch (90). A driving power transmission system (X) in the power transmission device (S) is configured by means of the auxiliary transmission device (40), etc. A working power transmission system (Y) in the power transmission device (S) is configured by means of the second continuously variable transmission device (35), a reduction mechanism (60), a working part transmission device (70), and a working part clutch (90), etc.

[0087] In the power transmission device (S), the transmission power, which is shifted by the first stepless transmission device (32), is input from the output shaft (32c) to the branch shaft (37), and is branched into driving power and working power by the branch shaft (37), and the branched driving power is output toward the front wheel (2) and rear wheel (3) by the driving power transmission system (X). Specifically, the branched driving power is input to the driving auxiliary transmission device (40), and is output from the auxiliary transmission device (40) toward the front wheel (2) and rear wheel (3). The branched working power is output toward the model planting mechanism (22), etc. of the model planting device (20) by the working power transmission system (Y). In detail, the branched working power is first input to the second stepless transmission (35), then input from the second stepless transmission (35) to the reduction mechanism (60), then input from the reduction mechanism (60) to the working unit transmission (70), then input from the working unit transmission (70) to the working unit clutch (90), and then output from the working unit clutch (90) toward the model planting mechanism (22) of the model planting unit device (20). That is, the second stepless transmission (35), the reduction mechanism (60), the working unit transmission (70), and the working unit clutch (90) installed in the working power transmission system (Y) are installed in a state where the order described above and the order in which the second stepless transmission (35), the reduction mechanism (60), the working unit transmission (70), and the working unit clutch (90) output toward the model planting mechanism (22) of the model planting unit device (20) match.

[0088] [Regarding the configuration of the branching axis (37)]

[0089] Specifically, as illustrated in FIGS. 3 and 4, the branch shaft (37) is rotatably supported on the left and right side walls of the transmission case (30). The end of the branch shaft (37) on the left side wall and the output shaft (32c) of the first stepless transmission device (32) are connected in such a way that they cannot rotate relative to each other by a spline locking connection. The end of the branch shaft (37) on the right side wall and the input shaft (35a) of the second stepless transmission device (35) are connected in such a way that they cannot rotate relative to each other by a connecting member (38). Two input gears (41, 42) are installed in such a way that they cannot rotate relative to each other in the middle section of the branch shaft (37) for driving auxiliary transmission device (40). The transmission power output by the first stepless transmission device (32) is divided into driving power and working power by the branching shaft (37), the divided driving power is input to the driving auxiliary transmission device (40), and the divided working power is input to the second stepless transmission device (35).

[0090] [Regarding the auxiliary transmission device (40) for driving]

[0091] As shown in FIG. 3, the driving auxiliary transmission device (40) has two input gears (41, 42) installed so as not to rotate relative to the branch shaft (37), in addition to an output shaft (43) parallel to the branch shaft (37), and a shift gear (44) supported so as not to rotate relative to and also to slide on the spline portion of the output shaft (43).

[0092] In the auxiliary transmission device (40) for driving, the shift gear (44) is slidably operated so that the gear portion (44a) on the large diameter side of the shift gear (44) engages with the input gear (41) on the small diameter side, thereby achieving a low-speed transmission state, and the gear portion (44b) on the small diameter side of the shift gear (44) engages with the input gear (42) on the large diameter side, thereby achieving a high-speed transmission state. In the auxiliary transmission device (40) for driving, even when the transmission is operated to either the low-speed or high-speed state, the driving power branched by the branch shaft (37) is transmitted to the output shaft (43) by the shift gear (44), and from the output shaft (43) through the gear linkage mechanism (45) to the input shaft (51) of the front wheel differential mechanism (50).

[0093] [Regarding the configuration of the front differential mechanism (50)]

[0094] In the front wheel differential mechanism (50), as shown in FIG. 3, driving power transmitted to the input shaft (51) is transmitted to a gear case (52) that cannot rotate relative to the input shaft (51), and is transmitted from the gear case (52) to the left and right front wheel drive shafts (54) through the differential gear mechanism part (53).

[0095] [Regarding the configuration of the rear output shaft (80)]

[0096] As shown in FIG. 3, the output shaft (80) for the rear wheel is equipped with an input gear (82) formed so as not to rotate relative to the end of the output shaft (80) within the transmission case. The input gear (82) is engaged with a power transmission gear (55) installed so as not to rotate relative to the input shaft (51) of the front wheel differential mechanism (50).

[0097] In the rear wheel output shaft (80), driving power transmitted from the driving auxiliary transmission device (40) to the input shaft (51) of the front wheel differential mechanism (50) is input by the power transmission gear (55) and the input gear (82), and the input driving power is output from the end opposite to the input side of the rear wheel output shaft (80). The driving power output from the rear wheel output shaft (80) is transmitted to the rear wheel drive case (83) by a rotating shaft (84) that extends and protrudes from the rear wheel output shaft (80) to the rear wheel drive case (83), as shown in FIG. 1.

[0098] A multi-plate friction brake (85) is mounted on the output shaft (80) for the rear wheel. In the friction brake (85), the operating shaft (86), which is rotatably supported on the first output boss (30c), is rotated by the operating arm (87), thereby switching between an input state in which the friction plate is pressed by the pressing member (88) and a disconnected state in which the pressing by the pressing member (88) of the friction plate is released.

[0099] [Regarding the configuration of the second stepless transmission device (35)]

[0100] As shown in FIG. 4 and 5, the second stepless transmission device (35) is provided with a transmission operating shaft (35b) rotatably supported in a casing. As shown in FIG. 9, the second stepless transmission device (35) is provided with a transmission regulating part (122). The rotation of the transmission operating shaft (35b) is regulated by the transmission regulating part (122) so that the angle of the hydraulic pump is not changed to the angle of the reverse rotation among the angles for neutral, forward rotation, and reverse rotation.

[0101] In the second stepless transmission device (35), when the transmission is shifted to a neutral state, the output shaft (39) of the second stepless transmission device (35) stops. When the transmission is shifted to a forward rotation state, the working power input from the branch shaft (37) to the input shaft (35a) is converted into forward rotation power by a hydraulic pump and a hydraulic motor, and the rotational speed is output from the output shaft (39) as stepless transmission power.

[0102] Additionally, as shown in FIGS. 4 and 5, the second stepless transmission device (35) is equipped with a transmission operating shaft (35b) rotatably supported in a casing. In the second stepless transmission device (35), the angle of the inclined plate of the hydraulic pump is changed by rotating the transmission operating shaft (35b), thereby shifting to a neutral state, a forward state, and a reverse state. When the second stepless transmission device (35) shifts to a neutral state, the output shaft (39) of the second stepless transmission device (35) stops. When the second stepless transmission device (35) shifts to a forward state, the working power input from the branch shaft (37) to the input shaft (35a) is converted into forward power, and the rotational speed is output from the output shaft (39) as stepless transmission power.

[0103] [Regarding the working reduction mechanism (60)]

[0104] As shown in FIGS. 4 and 5, the working reduction mechanism (60) is installed across the output shaft (39) of the second stepless transmission device (35) and the electric drive shaft (61) which is fitted from the outside so as to be rotatable relative to the output shaft (39). To explain in detail, as shown in FIG. 3, the output shaft (39) of the second stepless transmission device (35) is equipped with an output shaft body (39A) and an extension output shaft (39B). The working reduction mechanism (60) is installed across the extension output shaft (39B) of the output shaft (39) and the end of the electric drive shaft (61) on the second stepless transmission device side.

[0105] Specifically, as shown in FIG. 5, the reduction mechanism (60) comprises an input gear (62) installed so as not to rotate relative to the output shaft (39), a first intermediate gear (63) supported so as to rotate relative to the output shaft (71) of the work unit transmission device (70), a second intermediate gear (64) installed so as not to rotate relative to the boss portion of the first intermediate gear (63), and an output gear (65) installed so as not to rotate relative to the transmission shaft (61) while engaged with the second intermediate gear (64). The input gear (62) is installed on the extended output shaft (39B) of the output shaft (71). The output gear (65) is installed on the end portion of the second stepless transmission device side of the transmission shaft (61).

[0106] In the working reduction mechanism (60), the transmission power output by the second stepless transmission device (35) is reduced between the input gear (62) and the first intermediate gear (63), and is also reduced between the second intermediate gear (64) and the output gear (65) and transmitted from the output gear (65) to the transmission shaft (61).

[0107] [Regarding the configuration of the working unit transmission device (70)]

[0108] As shown in FIGS. 4 and 5, the work unit transmission device (70) is equipped with four input side gears (72) installed as input side members that are not rotatable relative to the power transmission shaft (61), and four output side gears (73) installed to be rotatable relative to the output shaft (71). The input side gears (72) are installed on the end side of the power transmission shaft (61) opposite to the end side where the reduction mechanism (60) is installed. As shown in FIG. 7, the four input side gears (72) are arranged with a gap between them by a spacer (98).

[0109] The first input gear (72a) among the four input gears (72) and the first output gear (73a) among the four output gears (73) are engaged, the second input gear (72b) among the four input gears (72) and the second output gear (73b) among the four output gears (73) are engaged, the third input gear (72c) among the four input gears (72) and the third output gear (73c) among the four output gears (73) are engaged, and the fourth input gear (72d) among the four input gears (72) and the fourth output gear (73d) among the four output gears (73) are engaged.

[0110] The first input gear (72a) and the first output gear (73a) are composed of circular gears with the same outer diameter. The second, third, and fourth input gears (72b, 72c, 72d) and the second, third, and fourth output gears (73b, 73c, 73d) are composed of elliptical gears, eccentric gears, or non-circular gears.

[0111] As shown in FIGS. 5 and 7, the working part transmission device (70) is equipped with a key groove (74) formed in the output shaft (71), a transmission key (75) slidably received in the key groove (74), and a transmission operating shaft (76) slidably supported across the boss portion (30e) of the transmission case (30) and the output shaft (71). The end of the transmission operating shaft (76) on the output shaft side is engaged with the end of the transmission key (75) so as to be able to be pushed and pulled.

[0112] In the working part transmission device (70), the transmission key (75) is moved in the key groove (74) by sliding the transmission operating shaft (76), and the key projection (77) of the transmission key (75) is selectively positioned to face the four output side gears (73), and the transmission is shifted to four types of transmission states by the key projection (77) being inserted into the locking coupling groove (78) of the output side gear (73). When the key projection (77) is locked into the locking coupling groove (78) of each of the four output side gears (73), the positioning sphere (96) is pressed against the transmission key (75) by the positioning spring (97), and the transmission key (75) is positioned at each transmission position by the positioning sphere (96). The key projection (77) is manufactured by fine blanking or sintering. As shown in FIG. 7, the bottom portion (77a) of the key projection (77) is formed in a cliff shape so as not to enter the locking coupling groove (78) of the output side gear (73) next to the output side gear (73) into which the key projection (77) is locked and inserted.

[0113] That is, in the work unit transmission device (70), when the key projection (77) is inserted into the locking coupling groove (78) of the first output side gear (73a), the transmission is shifted to the first transmission state. When the transmission is shifted to the first transmission state, the first output side gear (73a) and the output shaft (71) are connected so as not to rotate relative to each other by the key projection (77), and the work power transmitted to the electric drive shaft (61) by the reduction mechanism (60) is transmitted to the output shaft (71) through the first input side gear (72a), the first output side gear (73a), and the key projection (77), so that the angular velocity of one rotation of the output shaft (71) does not change and the rotational speed of one rotation is constant speed, the work power is output from the output gear (79) of the output shaft (71).

[0114] In the working part transmission device (70), when the key projection (77) is inserted into the locking coupling groove (78) of the second output side gear (73b), the transmission is shifted to the second transmission state; when the key projection (77) is inserted into the locking coupling groove (78) of the third output side gear (73c), the transmission is shifted to the third transmission state; and when the key projection (77) is inserted into the locking coupling groove (78) of the fourth output side gear (73d), the transmission is shifted to the fourth transmission state. In any of the second, third, and fourth gear shift states, the output side gears (73b, 73c, 73d) corresponding to that gear shift state and the output shaft (71) are connected in such a way that they cannot rotate relative to each other by the key projection (77), and the working power transmitted to the electric drive shaft (61) by the reduction mechanism (60) is transmitted to the output shaft (71) through the input side gears (72b, 72c, 72d), output side gears (73b, 73c, 73d), and the key projection (77) corresponding to that gear shift state, so that the angular velocity of one rotation of the output shaft (71) changes to high and low, and the working power of non-uniform rotation with varying speeds given to the rotational speed of one rotation is output from the output gear (79). When shifted to the second gear state, the third gear state, and the fourth gear state, the location of the rapid-shifting part during one rotation is different, or even if the rapid-shifting part is the same, the speed in the rapid-shifting part is different.

[0115] [Regarding the configuration of the working part clutch (90)]

[0116] As shown in FIG. 5, the work unit clutch (90) is installed below the work unit transmission unit (70) in the direction of transmission. Specifically, the work unit clutch (90) is installed between the output gear (79) of the work unit transmission unit (70) and the work output shaft (89). The work power, which is constant speed rotation and non-constant speed rotation output from the work unit transmission unit (70), is input to the input side clutch member (91) of the work unit clutch (90) in the same rotational state, and is transmitted to the work output shaft (89) from the output side clutch member (92) of the work unit clutch (90).

[0117] In the working part clutch (90), the operating shaft (93), which is slidably supported on the second output boss (30d), is pressed toward the inside of the second output boss (30d), so that the tip (93a) of the operating shaft (93) comes into contact with the fixed position stop cam (92a) of the output side clutch member (92), and the output side clutch member (92) is separated from the input side clutch member (91) by resisting the spring (94) and becomes disconnected, thereby disconnecting the power transmission to the model part device (20) by the working part clutch (90). As the operating shaft (93) is pulled toward the outside of the second output boss (30d), the tip (93a) of the operating shaft (93) is disengaged from the output side clutch member (92), and the output side clutch member (92) is engaged with the input side clutch member (91) by the spring (94) to become an input state, and power transmission to the model part device (20) is input by the working part clutch (90).

[0118] [Regarding the configuration of the working output shaft (89)]

[0119] The working output shaft (89) is connected to the input shaft of the feed case (25) via the rotating shaft (81) (see FIG. 1). The working power, which is constant speed and non-constant speed, transmitted from the working part clutch (90) to the working output shaft (89) is transmitted to the feed case (25) via the rotating shaft (81) while in its original rotational state. The working power, which is constant speed and non-constant speed, transmitted to the feed case (25) is transmitted to each of the eight model planting parts (22) via the planting drive case (21) while in its original rotational state.

[0120] When not performing planting work, such as moving, the vehicle is driven with the auxiliary transmission (40) for driving set to a high-speed gearbox, and when performing planting work, the vehicle is driven with the auxiliary transmission (40) for driving set to a low-speed gearbox. During planting work, by operating the first stepless transmission (32) to change the gearbox, the power of the engine (4) is shifted by the first stepless transmission (32) and transmitted to the front wheel (2) and rear wheel (3), thereby changing the driving speed of the vehicle (1). Even if the driving speed of the machine (1) is changed, the transmission power of the first stepless transmission device (32) is transmitted to the modeling mechanism (22), and the rotational speed of one rotation of the modeling mechanism (22) changes in conjunction with the change in the driving speed of the machine (1), and the modeling by the modeling mechanism (22) is performed while maintaining a width D1 that is set according to the transmission state of the second stepless transmission device (35) which is pre-operated with a transmission speed, regardless of the change in the driving speed of the machine (1).

[0121] By operating the second stepless transmission device (35), the working power from the branch shaft (37) is shifted by the second stepless transmission device (35) and transmitted to the model planting mechanism (22), so that the rotational speed of one revolution of the model planting mechanism (22) changes regardless of the driving speed of the machine (1). Accordingly, the model planting part by the model planting mechanism (22) is a main line D2 with a width set according to the shifting state of the second stepless transmission device (35) that was operated, and is performed as a main line with a width different from the main line D1 with a width before operating the second stepless transmission device (35).

[0122] When changing the day D to a day that is not very wide or a day that is not very narrow, the work unit transmission device (70) is set to the first transmission state. In this way, the work power for constant rotation set by the work unit transmission device (70) is transmitted to the planting unit mechanism (22), that is, the rotational speed of one rotation of the planting unit mechanism (22) is set to a constant rotational speed according to the first transmission state of the work unit transmission device (70), and the planting unit mechanism (22) performs the planting while rotating at a constant rotational speed.

[0123] When changing the weekly D to a wide weekly or narrow weekly, the work unit transmission device (70) is set to a transmission state corresponding to the width of the weekly D being changed among the second transmission state, third transmission state, and fourth transmission state. In this way, the work power for non-uniform rotation, which is set according to the gear shift state of the work unit gear shift device (70), is transmitted to the seed planting unit mechanism (22), that is, the speed corresponding to the width of the main D is given by the work unit gear shift device (70) to the rotation speed of one rotation of the seed planting unit mechanism (22), so that the seed planting unit mechanism (22) performs seed planting in a state where the movement speed when the planting hook (22c) is planting seedlings on the paddy field is faster than the movement speed when the planting hook (22c) is located at a position above the paddy field, or in a state where the movement speed when the planting hook (22c) is planting seedlings is slower than the movement speed when the planting hook (22c) is located at a position above the paddy field. Regardless of whether the day D is wide or narrow, seedling planting is performed in a state where the paddy field floor is not stirred up by the planting hook (22c) and the seedlings to be planted are not lifted from the paddy field floor by the planting hook (22c).

[0124] By operating the working part clutch (90) to a disconnected state, the power transmission to the seedling planting device (20) is cut off by the working part clutch (90), and the seedling planting mechanism (22) stops. At this time, due to the action of the fixed position stop cam part (92a), the seedling planting mechanism (22) stops at a rotational position where each of the pair of planting hooks (22c) is located above the paddy field floor.

[0125] As shown in FIGS. 3 and 4, the mission case (30) comprises a case body (30A) and a case cover portion (30B) that closes the lateral opening of the case body (30A). The case cover portion (30B) is connected to the end having the lateral opening of the case body (30A) by a connecting bolt (not shown). The mission case (30) is divided into the case body (30A) and the case cover portion (30B).

[0126] The first stepless transmission device (32) is supported on the outside of the case body (30A) as shown in FIG. 3 and 4. The second stepless transmission device (35) is supported on the outside of the case cover part (30B) as shown in FIG. 4. The working part transmission device (70) and the driving auxiliary transmission device (40) are installed inside the case body (30A) as shown in FIG. 3 and 4. The reduction mechanism (60) is installed inside the case cover part (30B) as shown in FIG. 4.

[0127] As illustrated in FIG. 3, the output shaft body (39A) of the output shaft (39) of the second stepless transmission device (35) is inserted through the case cover portion (30B) from the outside to the inside. The extended output shaft (39B) of the output shaft (39) is connected to the portion of the output shaft body (39A) located inside the transmission case in a way that prevents relative rotation and allows for separation. Since the reduction mechanism (60) and the transmission shaft (61) are installed on the extended output shaft (39B), by separating the extended output shaft (39B) from the output shaft body (39A), the reduction mechanism (60) and the input side gear (72) of the work part transmission device (70) are separated from the second stepless transmission device (35) together with the extended output shaft (39B).

[0128] [Regarding the configuration for lubricating the first stepless transmission device (32) and the second stepless transmission device (35)]

[0129] As shown in FIG. 8, a lubrication circuit (104) is connected to two charge ports (103) of the transmission case (30) and the first continuously variable transmission (32). Lubricating oil stored in the transmission case (30) is supplied as operating oil to the first continuously variable transmission (35) by the lubrication circuit (104).

[0130] Specifically, the refueling circuit (104) is equipped with a suction passage (104a) connected to one end of the transmission case (30), a hydraulic pump (105) connected to the other end of the suction passage (104a) by a suction part, a first refueling passage (104b) extending and protruding from the discharge part of the hydraulic pump (105), a second refueling passage (104c) connected to one end of the extended protruding end of the first refueling passage (104b) through a torque generator (100), and a third refueling passage (104d) connected to one end of the other end of the second refueling passage (104c) through a control valve circuit (106) of a lifting cylinder (101). A branched passage section (104e) divided into two is provided at the other end of the third refueling passage (104d). One side of the two branched flow paths (104e) is connected to one side of the two charge ports (103) of the first continuously variable transmission (32), and the other side of the two branched flow paths (104e) is connected to the other side of the two charge ports (103) of the first continuously variable transmission (32). As shown in FIGS. 3 and 4, the hydraulic pump (105) is supported on the right side of the outer portion of the upper part of the transmission case (30). The drive shaft (105a) of the hydraulic pump (105) and the input shaft (32a) of the first continuously variable transmission (32) are connected in conjunction by a rotation shaft (107). The hydraulic pump (105) is driven by the input shaft (32a) of the first continuously variable transmission (32).

[0131] In the lubrication circuit (104), as shown in FIG. 8, lubricating oil of the transmission case (30) is extracted by a hydraulic pump (105). The extracted lubricating oil is supplied to the torque generator (100) through the first lubrication path (104b) by the hydraulic pump (105), supplied from the torque generator (100) to the third lubrication path (104d) through the second lubrication path (104c) and the control valve circuit (106), and supplied as operating oil to the first stepless transmission device (32) from the two branched passage sections (104e) of the third lubrication path (104d).

[0132] As shown in FIG. 8, the drain passage (108) of the lifting cylinder (101) is connected to a portion upstream of the two branch passage sections (104e) of the third lubrication passage (104d). The drainage of the lifting cylinder (101) is supplied as working fluid to the first stepless transmission device (32) through the third lubrication passage (104d).

[0133] As shown in FIG. 8, a charge circuit (111) is connected to the drain port (109) of the first stepless transmission (32) and the charge port (110) of the second stepless transmission (35). The front wheel (2) and the rear wheel (3) are the first drive target devices that are the output targets of the first stepless transmission (32), and the model unit device (20) is the second drive target device that is the output target of the second stepless transmission (35). Since the drive load applied to the first stepless transmission (32) is greater than the drive load applied to the second stepless transmission (35), the set charge pressure of the first stepless transmission (32) is set to a higher pressure than the set charge pressure of the second stepless transmission (35). The discharged oil from the first stepless transmission device (32) is supplied to the second stepless transmission device (35) by the charge circuit (111), using the discharge pressure of the first stepless transmission device (32) as the return force.

[0134] As shown in FIG. 9, the charge circuit (111) is installed by drilling into the wall of the mission case (30). Specifically, the charge circuit (111) is installed by drilling into the upper wall portion (102), which is the part of the wall of the mission case (30) located at the top of the mission case (30), and the horizontal wall portion (113), which is the part of the wall of the mission case (30) located at the horizontal side of the mission case (30). The upper wall portion (102) extends across the case body (30A) and the case cover portion (30B). The horizontal wall portion (113) is the horizontal wall portion of the case cover portion (30B). A torque generator support portion (114) is formed in the upper portion of the front part of the mission case (30) to support the torque generator (100). The charge circuit (111) is provided with a first transverse circuit section (111a) that passes through the interior of the upper wall section (102) in a direction following the horizontal width direction of the body (1) in the rearward side of the torque generator support section (114), a front-rear direction circuit section (111b) that passes through the interior of the upper wall section (102) in a direction following the front-rear direction of the body (1) in the horizontal end side of the first stepless transmission device side, an up-down direction circuit section (111c) that passes through the interior of the transverse wall section (113) of the case cover section (30B) in a direction following the up-down direction of the body (1), and a second transverse circuit section (111d) that follows the boss section (115) protruding transversely from the transverse wall section (113) of the case cover section (30B). The front-rear direction circuit section (111b) is connected to the first lateral direction circuit section (111a) and the drain port (109) of the first stepless transmission device (32). The up-down direction circuit section (111c) is connected to the first lateral direction circuit section (111a) and the second lateral direction circuit section (111d). The second lateral direction circuit section (111d) is connected to the charge port (110) of the second stepless transmission device (35).

[0135] As shown in FIG. 8, a drain circuit (117) is installed to connect the drain port (116) of the second continuously variable transmission (35) to the transmission case (30). The drained oil discharged from the second continuously variable transmission (35) is returned to the transmission case (30) by the drain circuit (117).

[0136] Specifically, as shown in FIGS. 9, 10, and 11, the drain circuit (117) is composed of a groove (118) formed on the inner surface of a transverse wall (113) as a second wall of the transmission case (30), and a cover member (119) that closes the opening of the groove (118). The cover member (119) is installed on the inner surface of the transverse wall (113) by means of a connecting screw (120). As shown in FIG. 11, the upper end of the groove (118) is connected to the drain port (116) of the second stepless transmission device (35). As shown in FIG. 11, the lower end of the groove (118) is connected to the through hole (121) of the transverse wall (113) and is connected to the interior of the front wheel drive case (31) through the through hole (121).

[0137] The oil from the second stepless transmission unit (35) is discharged into the interior of the front-wheel drive case (31) by the drain circuit (117), cooled through the interior of the front-wheel drive case (31), and returned to the interior of the transmission case (30).

[0138] [Regarding the configuration of the gear shift key (75)]

[0139] Additionally, the shift key (75), shown by a solid line in FIG. 7, is operated to a shift position in which the key projection (77) is engaged and inserted into the engagement groove (78) of the second output side gear (73b), and is positioned in this shift position by the position determining sphere (96) and the position determining spring (97). Even when the shift key (75) is operated to a shift position in which the key projection (77) engages and enters into the engagement groove (78) of any output side gear (73) among the first output side gear (73a) to the fourth output side gear (73d), it is positioned in this shift position by the position determining sphere (96) and the position determining spring (97).

[0140] As shown in FIGS. 12 and 13, the key projection (77) is provided with a pulling side inclined portion (K1) and a pressing side inclined portion (K2). When performing a pull shift operation by pulling the shift key (75) to move it, the pulling side inclined portion (K1) of the key projection (77) receives a counter-operation force from the spacer (98) between the output side gears. When performing a push shift operation by pressing the shift key (75) to move it, as shown in FIGS. 12 and 13, the pressing side inclined portion (K2) of the key projection (77) receives a counter-operation force (Z) from the spacer (98) between the output side gears. Whether performing a pull shift operation or a push shift operation, as indicated by the dotted line in FIG. 7, the key projection side of the shift key (75) moves toward the positioning sphere (96) by means of the operating reaction force received from the spacer (98), using the part supported by the shift operation shaft (76) as the oscillation support point, and by this oscillation, the key projection (77) comes out of the locking coupling groove (78) while elastically deforming the positioning spring (97) toward the compression side. When performing a pull shift operation, the contact angle of the pull side inclined part (K1) with respect to the spacer (98) changes to a smaller size, and when performing a push shift operation, the contact angle of the push side inclined part (K2) with respect to the spacer (98) changes to a larger size. When performing a push-shift operation, as shown in FIG. 12 and 13, the first component of the operating reaction force (Z) received by the push-side inclined portion (K2) from the spacer (98) becomes the operating force that elastically deforms the positioning spring (97), and the second component of the operating reaction force (Z) becomes the resistance to the shift operation.

[0141] In the shift key (75) shown in FIG. 12, the angle of inclination Θ1 of the pressing side inclination part (K2) is gentler than the angle of inclination Θ of the pulling side inclination part (K1). In the shift key (75) shown in FIG. 13, the angle of inclination Θ2 of the pressing side inclination part (K2) and the angle of inclination Θ of the pulling side inclination part (K1) are the same. As shown in FIG. 12 and 13, the second component of the operating reaction force (Z) received by the shift key (75), where the angle of inclination of the pressing side inclination part (K2) is gentler than the angle of inclination of the pulling side inclination part (K1), is smaller than the second component of the operating reaction force (Z) received by the shift key (75), where the angle of inclination of the pressing side inclination part (K2) and the angle of inclination of the pulling side inclination part (K1) are equal.

[0142] By making the angle of inclination of the pressing side inclined portion (K2) of the key protrusion (77) gentler than the angle of inclination of the pulling side inclined portion (K1), the shifting resistance received by the shift key (75) during the pressing shifting operation becomes smaller than the shifting resistance received by the shift key (75) when the angle of inclination of the pressing side inclined portion (K2) and the angle of inclination of the pulling side inclined portion (K1) are equal, so that the shifting resistance received during the pressing shifting operation and the shifting resistance received during the pulling shifting operation are equal or nearly equal, so that the shifting operation can be performed with a good sense of operation.

[0143] In addition, embodiments for carrying out the present invention will be described based on the drawings. Also, in the following description, the direction of arrow F is referred to as the "front side of the aircraft" (see FIG. 14 and FIG. 15), the direction of arrow B as the "rear side of the aircraft" (see FIG. 14 and FIG. 15), the direction of arrow L as the "left side of the aircraft" (see FIG. 15), and the direction of arrow R as the "right side of the aircraft" (see FIG. 15).

[0144] [Overall Components of the Riding-Type Rice Transplanter]

[0145] FIGS. 14 and 15 illustrate a riding type rice transplanter (corresponding to a "paddy field work machine" according to the present invention). The riding type rice transplanter is equipped with a pair of left and right front wheels (1001), a pair of left and right rear wheels (1002), a body frame (1003), a driving unit (1004), and a seedling planting unit (1005) (corresponding to a "work device" according to the present invention) for planting seedlings on the paddy field. In the front part of the body, an engine E, a transmission case M, a driving HST (1006) (corresponding to a "transmission device" according to the present invention), and a daytime HST (1007) (corresponding to a "continuously variable transmission device" according to the present invention; see FIG. 16) are installed. Above the front part of the body, a receiving device (1008) for receiving position information from a satellite for a GPS (Global Positioning System) is installed. The driving section (1004) is equipped with a driver's seat (1009) on which the driver sits and a steering wheel (1010) for driving operations.

[0146] [Seed Planting Device]

[0147] As illustrated in FIGS. 14 and 15, the seedling planting unit (1005) is supported so as to be vertically movable through a link mechanism (1011) at the rear portion of the body frame (1003). In this embodiment, the seedling planting unit (1005) is configured by an 8-row type seedling planting unit. However, the number of planting rows of the seedling planting unit (1005) is not limited to 8 rows. The seedling planting unit (1005) is equipped with a seedling loading platform (1012) on which 8 rows of mat-shaped seedlings are loaded, a planting arm (1013), a feed case (not shown), a planting electric case (1014), a rotating case (1015), and a float (1016).

[0148] The rotating case (1015) is rotatably supported on each of the left and right sides of the rear portion of the planting electric case (1014). The planting arm (1013) extracts seedlings from the seedling loading platform (1012) and transplants them onto the paddy field. The planting arm (1013) is rotatably supported on each of the two feed portions of the rotating case (1015). As the engine driving force from the feed case is transmitted to the rotating case (1015) through the planting electric case (1014), the rotating case (1015) is rotated, and seedling planting is performed by the planting arm (1013).

[0149] [Power Transmission Configuration]

[0150] As illustrated in FIGS. 14 and 16, the driving HST (1006) is a continuously variable transmission that changes the engine driving force, and in this embodiment, it is configured by a hydrostatic continuously variable transmission. The driving HST (1006) is connected to the left side of the transmission case M.

[0151] The daytime HST (1007) is a continuously variable transmission device that transmits power from the driving HST (1006) to the model unit device (1005), and in this embodiment, it is configured by a hydrostatic continuously variable transmission device. The daytime HST (1007) is connected to the right side of the transmission case M.

[0152] In the daytime HST (1007), a trunnion shaft (1017) for operating an inclined plate (not shown) is provided. A driving mechanism (1018) (such as an electric motor) for rotating the trunnion shaft (1017) and an angle sensor (1019) for detecting the rotation angle of the trunnion shaft (1017) are installed.

[0153] The transmission case M has a gear-type auxiliary transmission (not shown) or a gear-type non-uniform speed transmission (1020) built in. The non-uniform speed transmission (1020) changes the angular velocity of the output power relative to the input power. In the range from when the planting arm (1013) extracts seedlings from the seedling loading platform (1012) and transplants them to the paddy field, the rotational speed of the rotating case (1015) can be adjusted to a slightly high or low speed by the non-uniform speed transmission (1020).

[0154] As shown in FIG. 14, the driving force of engine E is transmitted to the driving HST (1006) through the electric belt (1021). Then, the power shifted by the driving HST (1006) is branched in parallel to the driving electric system and the working electric system, so that the power of the driving electric system is transmitted to the left and right front wheels (1001) and left and right rear wheels (1002) through the auxiliary transmission device, etc., and the power of the working electric system is transmitted to the main HST (1007) and the auxiliary equal speed transmission device (1020), etc.

[0155] [Control Block]

[0156] As illustrated in FIG. 16, the control block is equipped with a control device (1022), a setting interval selection operation unit (1023) (corresponding to the “setting interval selection operation unit” of the present invention), a receiving device (1008), an angle sensor (1019), a rear wheel rotation speed sensor (1024) (corresponding to the “wheel rotation speed sensor” of the present invention), an input rotation speed sensor (1025), and an output rotation speed sensor (1026).

[0157] The rear wheel rotation speed sensor (1024) detects the rotation speed of the rear wheel (1002) and is installed inside the rear axle case. The input rotation speed sensor (1025) detects the rotation speed of the power input to the daytime HST (1007) (in other words, the power output from the driving HST (1006)) and is installed inside the transmission case M. The output rotation speed sensor (1026) detects the rotation speed of the power output from the daytime HST (1007) and is installed inside the transmission case M.

[0158] The setting week selection operation unit (1023) selects and operates a simulated planting interval S1 (corresponding to the "work interval" according to the present invention) for a paddy field by the seedling planting device (1005) from a plurality of setting weeks. In this embodiment, the setting week selection operation unit (1023) is configured by a setting operation screen provided in the operation unit (1004).

[0159] The control device (1022) is equipped with a gear setting unit (1027), a vehicle speed calculation unit (1028), and a planting interval adjustment unit (1029) (corresponding to the “work interval adjustment unit” according to the present invention).

[0160] The gear shift setting unit (1027) sets the gear shift of the weekly HST (1007) according to the setting weekly selected by the setting weekly selection operation unit (1023). The driving mechanism (1018) rotates the trunnion shaft (1017) based on a command from the gear shift setting unit (1027). A plurality of gear shifts of the weekly HST (1007) corresponding to each of the plurality of setting weekly are set in stages.

[0161] The vehicle speed calculation unit (1028) calculates the actual vehicle speed of the aircraft based on location information received by the receiving device (1008). The planting interval adjustment unit (1029) adjusts the planting interval S1 according to the actual vehicle speed of the aircraft calculated by the vehicle speed calculation unit (1028) so that the actual week matches the set week (the set week selected by the set week selection operation unit (1023)). The driving mechanism (1018) rotates the trunnion shaft (1017) based on a command from the planting interval adjustment unit (1029).

[0162] Here, the vehicle speed calculation unit (1028) calculates the actual vehicle speed of the vehicle based on the detection value of the rear wheel rotation speed sensor (1024) when the receiving device (1008) is in poor condition. At that time, the vehicle speed calculation unit (1028) calculates the actual vehicle speed of the vehicle based on the detection value of the rear wheel rotation speed sensor (1024) by considering a predetermined wheel slip ratio. In this embodiment, a design value is used as the predetermined wheel slip ratio. Additionally, the vehicle speed calculation unit (1028) calculates the actual vehicle speed of the vehicle based on the detection value of the input rotation speed sensor (1025) when the rear wheel rotation speed sensor (1024) is in poor condition (when the receiving device (1008) and the rear wheel rotation speed sensor (1024) are in poor condition).

[0163] (Other embodiments of the invention)

[0164] (1) In the above-described embodiment, the first stepless transmission device (32) and the second stepless transmission device (35) are shown as being supported on the upper part of the transmission case (30), but this is not limited thereto, and they may be supported on any part such as the lower part of the transmission case (30). Depending on the location where the first stepless transmission device (32) and the second stepless transmission device (35) are supported, the charge circuit (111) may be installed by drilling into any wall part, such as the upper wall part (102) of the transmission case (30), or the side wall part, or the bottom wall part.

[0165] (2) In the above embodiment, the drain circuit (117) is configured by a groove (118) formed in the cross wall (113) as the second wall, but it is not limited to this and a groove formed in any wall, such as the rear wall or the front wall, may be adopted.

[0166] (3) In the above embodiment, an example was shown in which a work unit transmission device (70) configured such that the transmission key (75) acts on the output side gear (73), but a work unit transmission device configured such that the transmission key (75) acts on the input side gear (72) may also be used.

[0167] (4) In the above embodiment, an example was shown in which the output shaft (39) of the work stepless transmission device (35) is equipped with an output shaft body (39A) and an extended output shaft (39B), but it is not limited to this and may be implemented by employing a single output shaft.

[0168] (5) In the above-described embodiment, an example was described in which a seedling planting device (20) is provided to supply seedlings as agricultural materials to the surface, but this is not limited thereto. A working device may be provided to supply rice seeds, liquid or granular chemicals, or liquid or granular fertilizers as agricultural materials to the paddy field.

[0169] (6) In the above-described embodiment, an example in which an engine (4) is provided as the prime mover has been shown, but it is not limited thereto and an electric motor may be used. In addition, a combination of an engine and an electric motor may be used.

[0170] (7) In the above-described embodiment, an example was shown in which a front wheel (2) and a rear wheel (3) are used as a driving device, but this is not limited thereto, and a crawler driving device can be used. In addition, a driving device combining a wheel and a mini crawler can be used.

[0171] (8) In the above-described embodiment, the transmission device (32) for driving and working is configured by a hydrostatic continuously variable transmission device, but is not limited thereto and may be configured by a gear-type transmission device. In addition, it may be configured by a continuously variable transmission device that combines a belt-type continuously variable transmission device and a forward / reverse switching device.

[0172] (9) In the above-described embodiment, the stepless transmission (35) for work is configured as a stepless transmission of a hydrostatic type, but is not limited thereto and may be configured as a stepless transmission of a belt type.

[0173] (10) In the above embodiment, the “paddy work machine” according to the present invention was a riding type rice transplanter. However, instead of this, the “paddy work machine” according to the present invention may be a sowing machine. In this case, the sowing machine is equipped with a sowing device (equivalent to the “work device” according to the present invention) for sowing on the paddy field, a stepless transmission device that transmits power from a driving HST (1006) to the sowing device, a setting interval selection operation unit for selecting and operating the sowing interval on the paddy field by the sowing device from a plurality of setting intervals, and a gear setting unit (1027) for setting the gear of the stepless transmission device according to the selected setting interval.

[0174] (11) In the above embodiment, the setting week selection operation unit (1023) is configured by a setting operation screen. However, instead of this, the setting week selection operation unit (1023) may be configured by a lever.

[0175] (12) In the above embodiment, the “wheel rotation speed sensor” according to the present invention is configured by a rear wheel rotation speed sensor (1024). However, instead of this, the “wheel rotation speed sensor” according to the present invention may be configured by a front wheel rotation speed sensor that detects the rotation speed of the front wheel (1001).

[0176] (13) In the above embodiment, the driving HST (1006) is configured by a hydrostatic continuously variable transmission. However, instead of this, the “transmission device” according to the present invention may be configured by a transmission device other than a hydrostatic continuously variable transmission (e.g., a geared transmission device).

[0177] (14) In the above embodiment, the daytime HST (1007) is configured by a hydrostatic continuously variable transmission. However, instead of this, the “continuously variable transmission” according to the present invention may be configured by a continuously variable transmission other than a hydrostatic continuously variable transmission.

[0178] (15) In the above embodiment, if the tooth of the detection gear detected by the rear wheel rotation speed sensor (1024) is missing, the rotation speed of the rear wheel (1002) may be detected based on the rotation (pulse signal) trend of the detection gear.

[0179] (16) In the above embodiment, when the rear wheel rotation speed sensor (1024) is in poor condition, the input rotation speed sensor (1025) is used as an alternative means. Conversely, when the input rotation speed sensor (1025) is in poor condition, the rear wheel rotation speed sensor (1024) may be used as an alternative means. For example, when the input rotation speed sensor (1025) is in poor condition (when the receiving device (1008) and the input rotation speed sensor (1025) are in poor condition), the vehicle speed calculation unit (1028) may calculate the actual vehicle speed of the vehicle based on the detection value of the rear wheel rotation speed sensor (1024).

[0180] (17) In the above embodiment, the position of the auxiliary gear shift lever that operates the auxiliary gear shift device may be detected, and based on the position of the auxiliary gear shift lever, the detection value of the rear wheel rotation speed sensor (1024) and the detection value of the input rotation speed sensor (1025) may be converted. In addition, the detection value of the rear wheel rotation speed sensor (1024) and the detection value of the input rotation speed sensor (1025) may be compared, and the position of the auxiliary gear shift lever may be determined based on the result of the comparison between the detection value of the rear wheel rotation speed sensor (1024) and the detection value of the input rotation speed sensor (1025).

[0181] Furthermore, the present invention is not limited to the above embodiments and other embodiments, and various other modifications are possible. Industrial applicability

[0182] In addition to riding-type rice transplanters, the present invention can be applied to working machines that supply agricultural materials such as seeds, fertilizers, or chemicals to the surface, such as riding-type seeders.

[0183] In addition, the present invention can be used in seeders in addition to riding-type rice transplanters. Explanation of the symbols

[0184] 2: First driving target device (driving device / wheel) 3: First driving target device (driving device / rear wheel) 4: Prime mover (engine) 11: Agricultural material supply unit (seedling stack) 20: Second driving target device (working device / modeling device) 22: Work section (Seed planting section equipment) 30: Mission Case 30A: Case body 30B: Case cover 31: Driving device drive case part (front wheel drive case part) 32: First continuously variable transmission 35: Second continuously variable transmission 37: Branching section (branching axis) 39: Output axis 39A: Output shaft body 39B: Extended output shaft 60: Reduction mechanism 61: Electric drum 70: Working unit transmission 72: Input side member (input side gear) 90: Working part clutch S: Power transmission device X: Driving power transmission system Y: Working power transmission system 102: Part of the wall (upper wall) 104: Fueling circuit 109: Drain port 110: Charge Port 111: Charge circuit 113: Second wall section (transverse wall section) 117: Drain circuit 118: Home 119: Cover member 1005 : Seed planting device (working device) 1006 : Driving HST (Transmission) 1007 : Weekly HST (Continuously Variable Transmission) 1008 : Receiving device 1023 : Setting Week Selection Control Panel (Setting Interval Selection Control Panel) 1024 : Rear wheel rotation speed sensor (wheel rotation speed sensor) 1025: Input rotation speed sensor 1027 : Gear setting section 1028 : Vehicle speed calculation unit 1029 : Planting spacing adjustment unit (Work spacing adjustment unit) S1 : Planting interval (work interval)

Claims

Claim 1 A work machine having a power transmission device comprising: a work unit that supplies agricultural materials to a paddy field while rotating up and down between an agricultural material supply unit and a paddy field; a transmission device that receives power from a prime mover and outputs a transmission power by changing the input power; a branching unit that branches the transmission power output by the transmission device into driving power and working power; a driving power transmission system that outputs driving power from the branching unit toward a driving device; and a working power transmission system that outputs working power from the branching unit toward the work unit, wherein the working power transmission system is equipped with a hydrostatic continuously variable transmission device, a reduction mechanism, and a work unit transmission device that provides speed control to the rotational speed of one revolution of the work unit. Claim 2 A work device according to claim 1, wherein the stepless transmission device is provided with an externally fitted drive shaft that is rotatable relative to the output shaft of the stepless transmission device, the reduction mechanism is installed across the output shaft and the drive shaft, and the input side member of the work unit transmission device is installed on the drive shaft. Claim 3 A work device according to claim 1 or 2, wherein a transmission case accommodating the work unit transmission device and the reduction gear mechanism is provided, and the transmission case is configured to be divisible into a case body in which the work unit transmission device is located internally and a case cover part in which the reduction gear mechanism is located internally. Claim 4 In paragraph 3, the above-mentioned continuously variable transmission device is supported on the outside of the case cover portion, and the output shaft of the above-mentioned continuously variable transmission device comprises an output shaft body that is inserted and penetrates the case cover portion from the outside to the inside, and an extension output shaft that is connected to the portion of the output shaft body located within the transmission case so as not to rotate relative to it and to be freely detachable, and the reduction mechanism and the electric drive shaft externally fitted to the output shaft so as to rotate relative to it are a work device installed on the extension output shaft. Claim 5 In paragraph 4, the work unit is equipped with a work unit clutch that is installed below the work unit transmission device in the direction of transmission and inputs and disconnects power transmission to the work unit. Claim 6 In paragraph 5, the above agricultural material supply unit is a seedling stacking unit that stores seedlings as agricultural materials, and the above working unit is a working machine that is a seedling planting unit that extracts seedlings from the above seedling stacking unit and supplies the extracted seedlings to the paddy field. Claim 7 delete Claim 8 delete Claim 9 delete Claim 10 delete Claim 11 delete Claim 12 delete Claim 13 delete Claim 14 delete

Images