Paddy field working machine and working machine

Abstract

The present invention provides a paddy field working machine and a working machine. The paddy field working machine includes: a working device that performs rice transplanting or seeding on the paddy field surface; a speed change device that changes the speed of the engine driving force; a continuously variable transmission device that variably transmits the power from the speed change device to the working device; a set interval selection operation unit that selects an operation interval of the working device on the paddy field surface from a plurality of set intervals; and a gear shift setting unit that sets the gear shift of the continuously variable transmission device according to the selected set interval. Thus, it is possible to smoothly change the speed of the power transmitted to the working device without speed change jerks.

Description

[0001] This application is a divisional application of the invention patent application with the application date of February 19, 2019, application number 201910121547.X, and invention name "Paddy field working machine and working machine". Technical Field

[0002] The present invention relates to a paddy field working machine having a working device for transplanting or sowing on the paddy field surface and a working machine for supplying agricultural materials to the paddy field surface. Background Art

[0003] [1] As the above-mentioned paddy field working machine, for example, the paddy field working machine described in Patent Document 1 is known. Patent Document 1 discloses a paddy field working machine (referred to as "seedling planter" in the document), which has a working device for transplanting on the paddy field surface (referred to as "seedling planting device [4]" in the document), a speed change device for changing the speed of the engine driving force (referred to as "main speed change device

[31] " in the document), and a speed change device for speed-changing and transmitting the power from the speed change device to the working device (referred to as "plant spacing speed change mechanism

[36] " in the document).

[0004] [2] Patent Document 2 discloses a riding type rice transplanter as an example of a working machine. In Patent Document 2, the power of the engine is transmitted to the main speed change device, and the speed-changed power output by the main speed change device branches into traveling power and working power. The traveling power is transmitted to the front wheels and the rear wheels, and the working power is transmitted to the transplanting mechanism via the working speed change gear transmission.

[0005] Thus, since the power transmitted to the transplanting device is also the speed-changed power of the main speed change device, even if the main speed change device is operated to change the traveling speed of the machine body, the plant spacing of the transplanting mechanism is maintained at the set interval set by the working speed change gear transmission. And by performing a speed change operation on the working speed change gear transmission, the set plant spacing of the transplanting mechanism can be changed.

[0006] [3] For example, as shown in Patent Document 3, there is a working vehicle that has a hydrostatic continuously variable transmission dedicated to the left rear wheel for driving the left rear wheel and a hydrostatic continuously variable transmission dedicated to the right rear wheel for driving the right rear wheel.

[0007] Prior Art Documents

[0008] Patent Documents

[0009] Patent Document 1: Japanese Patent Laid-Open No. 2005-237281

[0010] Patent Document 2: Japanese Unexamined Patent Application Publication No. 2014-70653

[0011] Patent Document 3: Japanese Unexamined Patent Application Publication No. 2016-55815 Summary of the Invention

[0012] Technical Problem to be Solved by the Invention

[0013] [1] The technical problems corresponding to [1] of the background art are as follows.

[0014] In the paddy field working machine described in Patent Document 1, since the speed change device for the working device is composed of a gear type speed change device, there is room for improvement from the viewpoint of smoothly changing the speed of the power transmitted to the working device without speed change jerks.

[0015] In view of the above situation, there is an urgent need for a paddy field working machine that can smoothly change the speed of the power transmitted to the working device without speed change jerks.

[0016] [2] The technical problems corresponding to [2] of the background art are as follows.

[0017] In the case of adopting the prior art, the interval (supply interval) in the traveling direction of the machine body for supplying agricultural materials to the paddy field surface is changed stepwise by using a gear transmission. In recent years, the demand for appropriately setting the supply interval of agricultural materials according to the properties of the paddy field surface or agricultural materials has become stronger.

[0018] The present invention provides a working machine that can appropriately set the supply interval of agricultural materials corresponding to the properties of the paddy field surface or agricultural materials.

[0019] [3] The technical problems corresponding to [3] of the background art are as follows.

[0020] In a working machine having a hydrostatic first continuously variable transmission that outputs to a first drive target device such as the left rear wheel dedicated continuously variable transmission described above and a hydrostatic second continuously variable transmission that outputs to a second drive target device such as the right rear wheel dedicated continuously variable transmission described above, when a dedicated hydraulic pump and an oil replenishing circuit for replenishing working oil to the first continuously variable transmission are provided and a dedicated hydraulic pump and an oil replenishing circuit for replenishing working oil to the second continuously variable transmission are provided so that working oil can be replenished to the first continuously variable transmission and the second continuously variable transmission respectively, the cost increases such as the number of required hydraulic pumps becoming more.

[0021] In addition, even if the working oil from the hydraulic pump is shunted and replenished to the first continuously variable transmission and the second continuously variable transmission by a flow dividing valve, a flow dividing valve is required, and a large hydraulic pump with a large discharge amount is required, resulting in an increase in cost.

[0022] The present invention provides a work machine that includes hydrostatic continuously variable transmission devices for a first driven device and a second driven device respectively, and can supply working oil to the two continuously variable transmission devices economically.

[0023] Means for Solving Technical Problems

[0024] [1] The solution corresponding to technical problem [1] is as follows.

[0025] The present invention is characterized in that a work machine includes: a working device that performs rice transplanting or seeding on the paddy field surface; a speed change device that changes the engine driving force; a continuously variable transmission device that variably transmits the power from the speed change device to the working device; a setting interval selection operation unit that selects an operation interval of the working device on the paddy field surface from a plurality of setting intervals; and a gear shift setting unit that sets the gear shift of the continuously variable transmission device according to the selected setting interval.

[0026] According to this characteristic structure, since the speed change device for the working device is composed of a continuously variable transmission device, the power transmitted to the working device can be smoothly changed without speed change jerks. In addition, the speed change device for the working device is a continuously variable transmission device, and the correspondence relationship between the setting interval and the gear shift of the continuously variable transmission device is clear. Thus, the operability of the operator can be improved.

[0027] Moreover, in the present invention, it is preferable that the work machine includes a working interval adjustment unit that adjusts the working interval according to the actual vehicle speed of the machine body.

[0028] According to this characteristic structure, the working interval can be adjusted with high precision so that the actual working interval matches the set interval.

[0029] Moreover, in the present invention, it is preferable that the work machine includes a receiving device that receives position information from a satellite and a vehicle speed calculation unit that calculates the actual vehicle speed of the machine body based on the position information received by the receiving device, and the working interval adjustment unit adjusts the working interval according to the actual vehicle speed of the machine body calculated by the vehicle speed calculation unit.

[0030] According to this characteristic structure, the vehicle speed calculation unit instantaneously calculates the actual vehicle speed of the machine body based on the position information received by the receiving device, and the working interval adjustment unit adjusts the working interval according to the actual vehicle speed of the machine body calculated by the vehicle speed calculation unit. Thus, the working interval can be adjusted with higher precision so that the actual working interval matches the set interval.

[0031] Moreover, in the present invention, preferably, the work machine is provided with a wheel speed sensor for detecting the rotational speed of the wheels, and in the case of a failure of the receiving device, the vehicle speed calculation unit calculates the actual vehicle speed of the machine body based on the detection value of the wheel speed sensor.

[0032] There is a correlation between the detection value of the wheel speed sensor and the actual vehicle speed of the machine body. According to this characteristic structure, in the case of a failure of the receiving device, by using the wheel speed sensor as an alternative means, it is possible to avoid the situation where the operation interval cannot be adjusted.

[0033] Moreover, in the present invention, preferably, the vehicle speed calculation unit calculates the actual vehicle speed of the machine body based on the detection value of the wheel speed sensor while considering the slip ratio of a specified wheel.

[0034] According to this characteristic structure, by reflecting the slip ratio of the specified wheel in the actual vehicle speed calculated by the vehicle speed calculation unit, it is possible to calculate the actual vehicle speed of the machine body with high precision.

[0035] Moreover, in the present invention, preferably, the work machine is provided with an input speed sensor for detecting the rotational speed of the power input to the continuously variable transmission, and in the case of a failure of the wheel speed sensor, the vehicle speed calculation unit calculates the actual vehicle speed of the machine body based on the detection value of the input speed sensor.

[0036] There is a correlation between the detection value of the input speed sensor and the actual vehicle speed of the machine body. According to this characteristic structure, in the case of failures of the receiving device and the wheel speed sensor, by using the input speed sensor as an alternative means, it is possible to avoid the situation where the operation interval cannot be adjusted.

[0037] Moreover, in the present invention, preferably, the transmission and the continuously variable transmission are constituted by a hydrostatic continuously variable transmission.

[0038] According to this characteristic structure, it is possible to more smoothly vary the power transmitted to the working device.

[0039] [2] The solutions corresponding to [2] of the technical problems are as follows.

[0040] The working machine of the present invention includes: a working unit that rotates up and down between an agricultural material supply unit and the ground surface while supplying agricultural materials to the ground surface; a speed change device that is input with the power of a prime mover, changes the speed of the input power, and outputs a speed-changed power; a power transmission device that has a branch portion that branches the speed-changed power output by the speed change device into a traveling power and a working power, a traveling power transmission system that outputs the traveling power from the branch portion to a traveling device, and a working power transmission system that outputs the working power from the branch portion to the working unit; in the working power transmission system, a continuously variable transmission device, a speed reduction mechanism, and a working unit speed change device are provided in the order of power transmission to the working unit, and the working unit speed change device makes the rotational speed of one rotation of the working unit fast and slow.

[0041] According to this structure, by performing a speed change operation on the continuously variable transmission device, the speed of the working power transmitted to the working unit is continuously variable independently of the speed of the traveling power, and the interval (supply interval) in the traveling direction of the machine body that supplies agricultural materials to the ground surface by the working unit is continuously variable.

[0042] In order to set the supply interval wider, the working power transmitted to the working unit needs to be set to a low speed. Therefore, it is only necessary to set the continuously variable transmission device to a low-speed state. However, when set to a low-speed state that matches the low speed of the working power, a low-torque and low-speed power is output from the continuously variable transmission device, and there is a case where the working unit does not work smoothly due to the driving resistance of the working unit. In addition, depending on the continuously variable transmission device, there are cases where the continuously variable transmission device vibrates or does not work smoothly. According to this structure, even if the continuously variable transmission device is set to a high-speed state compared to the low speed of the working power to be transmitted to the working unit, the speed-changed power output by the continuously variable transmission device is decelerated by the speed reduction mechanism and transmitted to the working unit. Therefore, it is possible to set the supply interval wider while avoiding poor operation of the working unit or the continuously variable transmission device.

[0043] In addition, in order to set a relatively wide supply interval, it is only necessary to set the working speed of the working unit to a low speed so that the working unit rotates one week at a low speed. However, when simply setting the working speed of the working unit to a low speed, the elapsed time during which the working unit rises relative to the field surface after reaching the field surface becomes long, resulting in the following supply problems: the working unit pulled by the travel of the machine body disturbs the field surface over a wide range, causing the agricultural materials to be supplied to the field surface to spread or move from the specified supply position, etc. In order to set a relatively narrow supply interval, it is only necessary to set the working speed of the working unit to a high speed so that the working unit rotates one week at a high speed. However, when simply setting the working speed of the working unit to a high speed, the elapsed time during which the working unit rises relative to the field surface after reaching the field surface becomes short, resulting in supply problems such as the agricultural materials that should be supplied to the field surface by the working unit being pulled up from the field surface by the working unit. According to this structure, by performing a speed change operation on the working unit speed change device corresponding to the set supply interval, the rotational speed of the working unit for one rotation can be made fast or slow, and the adjustment is made in such a way that the elapsed time during which the working unit rises relative to the field surface after reaching the field surface is not excessively long or not excessively short. Therefore, it is possible to set a relatively wide or relatively narrow supply interval while avoiding supply problems of agricultural materials.

[0044] Therefore, it is possible to finely change and set the supply interval of the agricultural materials in the traveling direction of the machine body, so it is possible to appropriately set the supply interval of the agricultural materials corresponding to the field surface, the properties of the agricultural materials, etc.

[0045] In the present invention, it is preferable that the continuously variable transmission device is a hydrostatic continuously variable transmission device.

[0046] According to this structure, it is possible to perform a fine speed change of slightly shifting the speed change power output from the speed change device to the high speed side or slightly to the low speed side without difficulty. Therefore, it is possible to more finely change and set the supply interval of the agricultural materials, and it is possible to more appropriately set the supply interval of the agricultural materials.

[0047] In the present invention, it is preferable that a drive cylinder shaft is provided in the continuously variable transmission device. The drive cylinder shaft is externally fitted to the output shaft of the continuously variable transmission device in a relatively rotatable manner. The reduction mechanism is provided across the output shaft and the drive cylinder shaft, and the input side member of the working unit speed change device is provided on the drive cylinder shaft.

[0048] According to this structure, since the continuously variable transmission device, the reduction mechanism, and the working unit speed change device can be arranged in a concentrated state in the axial direction along the output shaft of the continuously variable transmission device, a compact power transmission device can be obtained.

[0049] In the present invention, preferably, the working machine includes a gearbox that houses the speed change device for the working unit and the reduction mechanism, and the gearbox is configured to be divisible into a box body in which the speed change device for the working unit is provided inside and a box cover portion in which the reduction mechanism is provided inside.

[0050] According to this structure, when assembling the speed change device for the working unit and the reduction mechanism into the gearbox, the reduction mechanism is located at a position closer to the front side than the speed change device for the working unit that requires high-precision phase matching between the input-side component and the output-side component. The speed change device for the working unit can be easily seen, so the assembly operation is easy.

[0051] In the present invention, preferably, the continuously variable transmission is supported outside the box cover portion, and the output shaft of the continuously variable transmission includes: an output shaft main body that is inserted from the outside of the box cover portion into the inside of the box cover portion; an extended output shaft that is detachably and non-rotatably connected to the portion of the output shaft main body located inside the gearbox; the reduction mechanism and a transmission cylinder shaft that is externally fitted to the output shaft in a rotatable manner are provided on the extended output shaft.

[0052] According to this structure, by separating the extended output shaft from the output shaft main body, the input-side components of the reduction mechanism and the speed change device for the working unit can be separated from the continuously variable transmission together with the extended output shaft, so maintenance such as inspection of the reduction mechanism and the speed change device for the working unit is easy.

[0053] In the present invention, preferably, the working machine includes a working unit clutch that is provided on the downstream side in the transmission direction relative to the speed change device for the working unit and controls the on / off of power transmission to the working unit.

[0054] According to this structure, since the power transmission to the working unit is cut off at a position on the downstream side in the transmission direction relative to the speed change device for the working unit to stop the working unit, it is not necessary to consider the set speed change state of the speed change device for the working unit in order to equip a fixed-position stop mechanism. Therefore, it is easy to equip a fixed-position stop mechanism, which is a mechanism that causes the working unit to stop at a specific position during one rotation when the working unit clutch is cut off.

[0055] In the present invention, preferably, the agricultural material supply unit is a seedling tray that stores seedlings as agricultural materials, and the working unit is a transplanting mechanism that takes out seedlings from the seedling tray and supplies the taken-out seedlings to the paddy field surface.

[0056] According to this structure, transplanting operations can be performed while finely changing the set plant spacing.

[0057] [3] The solutions corresponding to technical problem [3] are as follows.

[0058] The working machine of the present invention includes a hydrostatic first continuously variable transmission that outputs to a first driven device and a hydrostatic second continuously variable transmission that outputs to a second driven device. The working machine includes a supplementary oil circuit that is connected to the oil discharge port of the first continuously variable transmission and the oil supply port of the second continuously variable transmission, and uses the discharge pressure of the first continuously variable transmission to supply the discharged oil discharged from the first continuously variable transmission as working oil to the second continuously variable transmission.

[0059] According to this structure, since the discharged oil discharged from the first continuously variable transmission is supplied as working oil to the second continuously variable transmission using the discharge hydraulic pressure of the first continuously variable transmission, it is only necessary to provide a hydraulic pump for supplying working oil to the first continuously variable transmission, and there is no need to provide a dedicated hydraulic pump for the second continuously variable transmission. In addition, compared with the case of using a flow dividing valve, a smaller hydraulic pump can be used.

[0060] Therefore, while including the first continuously variable transmission for the first driven device and the second continuously variable transmission for the second driven device, it is possible to economically supply working oil to the two continuously variable transmissions.

[0061] In the present invention, it is preferable that the working machine includes a transmission case that supports the first continuously variable transmission and the second continuously variable transmission, and the supplementary oil circuit passes through the wall portion of the transmission case.

[0062] According to this structure, the supplementary oil circuit can be compactly installed.

[0063] In the present invention, it is preferable that the first continuously variable transmission and the second continuously variable transmission are supported on the upper part of the transmission case, and the supplementary oil circuit passes through the part of the wall portion located in the upper part of the transmission case.

[0064] According to this structure, the supplementary oil circuit is shortened, so it is easy to pass the supplementary oil circuit through the transmission case.

[0065] In the present invention, it is preferable that the working machine includes: a traveling device drive box portion that extends from the transmission case; an oil supply circuit that takes out lubricating oil from the transmission case and supplies the taken-out lubricating oil as working oil to the first continuously variable transmission; and an oil discharge circuit that discharges the discharged oil of the second continuously variable transmission to the traveling device drive box portion.

[0066] According to this structure, the discharged oil from the second continuously variable transmission passes through the traveling device drive box portion, is cooled in the traveling device drive box portion, and returns to the transmission case, so it is easier to cool the oil compared with directly returning to the transmission case.

[0067] In the present invention, preferably, the oil drain circuit is constituted by a groove formed on the inner surface of the second wall portion of the transmission and a lid member mounted on the inner surface to close the opening of the groove.

[0068] According to this structure, compared with the operation of drilling an oil passage in the second wall portion of the transmission, the operation of forming the groove is easier, so it is easy to form the oil drain circuit.

[0069] In the present invention, preferably, the first driven device is a traveling device, and the second driven device is a working device for supplying agricultural materials to the field.

[0070] In a working machine where preventing oil leakage is very important for operations on the field, only a small number of small hydraulic pumps need to be provided, so it is easy to prevent oil leakage.

[0071] In the present invention, preferably, the variable-speed power output by the first continuously variable transmission is branched into traveling power and working power. The branched traveling power is transmitted to the traveling device, and the branched working power is transmitted to the working device via the second continuously variable transmission.

[0072] According to this structure, even if the traveling speed is changed by performing a speed change operation on the first continuously variable transmission, the variable-speed power from the first continuously variable transmission is transmitted to the working device. Therefore, operations can be performed in a state where the working condition of the working device remains unchanged regardless of the change in the traveling speed. By performing a speed change operation on the second continuously variable transmission, the driving speed of the working device changes independently of the traveling speed. Therefore, the working condition of the working device can be changed independently of the traveling speed.

[0073] In the present invention, preferably, the working device is a rice transplanter for supplying seedlings, which are agricultural materials, to the field.

[0074] According to this structure, rice transplanting can be performed in a state where the planting condition of the seedlings remains unchanged regardless of the change in the traveling speed, or rice transplanting can be performed while changing the planting condition of the seedlings independently of the traveling speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 It is a left view showing a riding type rice transplanter.

[0076] Figure 2 It is a top view showing a riding type rice transplanter.

[0077] Figure 3 It is a diagram showing a control module.

[0078] Figure 4 It is a left view showing the entire riding type rice transplanter.

[0079] Figure 5 It is a top view showing the entire riding type transplanter.

[0080] Figure 6 It is a cross-sectional view of the transmission.

[0081] Figure 7 It is a cross-sectional view of the transmission.

[0082] Figure 8 It is a cross-sectional view of the transmission.

[0083] Figure 9 It is a block diagram showing the power transmission device.

[0084] Figure 10 It is an explanatory diagram showing the function of the speed change key.

[0085] Figure 11 It is an explanatory diagram showing the structure and function of the speed change key.

[0086] Figure 12 It is an explanatory diagram showing the structure and function of the speed change key.

[0087] Figure 13 It is a left view showing the entire riding type transplanter.

[0088] Figure 14 It is a top view showing the entire riding type transplanter.

[0089] Figure 15 It is a cross-sectional view of the transmission.

[0090] Figure 16 It is a cross-sectional view of the transmission.

[0091] Figure 17 It is a cross-sectional view of the transmission.

[0092] Figure 18 It is a block diagram showing the power transmission device.

[0093] Figure 19 It is an explanatory diagram showing the function of the speed change key.

[0094] Figure 20 It is a hydraulic circuit diagram.

[0095] Figure 21 It is a top view showing the oil replenishing circuit.

[0096] Figure 22 It is a side view showing the oil drainage circuit.

[0097] Figure 23 It is a longitudinal cross-sectional view showing the oil drainage circuit.

[0098] Explanation of reference numerals

[0099] 5 Transplanter (working device)

[0100] 6 Traveling HST (speed change device)

[0101] 7 Plant spacing HST (continuously variable transmission)

[0102] 8 Receiving device

[0103] 23 Set plant spacing selection operation part (set interval selection operation part)

[0104] 24 Rear wheel speed sensor (wheel speed sensor)

[0105] 25 Input speed sensor

[0106] 27 Gear shift setting part

[0107] 28 Vehicle speed calculation part

[0108] 29 Planting interval adjustment part (working interval adjustment part)

[0109] S Planting interval (working interval)

[0110] 102 Traveling device (front wheels)

[0111] 103 Traveling device (rear wheels)

[0112] 104 Prime mover (engine)

[0113] 111 Agricultural material supply part (seedling table)

[0114] 122 Working part (transplanting mechanism)

[0115] 130 Transmission

[0116] 130A Case main body

[0117] 130B Case cover part

[0118] 132 Speed change device (first continuously variable transmission)

[0119] 135 Continuously variable transmission (second continuously variable transmission)

[0120] 137 Branch part (branch shaft)

[0121] 139 Output shaft

[0122] 139A Output shaft main body

[0123] 139B Extended output shaft

[0124] 160 Reduction mechanism

[0125] 161 Transmission cylinder shaft

[0126] Variable speed device for the 170 operation unit

[0127] 172 Input side component (input side gear)

[0128] Clutch for the 190 operation unit

[0129] Power transmission device Sa

[0130] Power transmission system X for traveling

[0131] Power transmission system Y for operation

[0132] 202 First driven object device (traveling device, front wheels)

[0133] 203 First driven object device (traveling device, rear wheels)

[0134] 220 Second driven object device (operation device, transplanter)

[0135] 230 Transmission

[0136] 231 Driving box part of traveling device (front wheel driving box part)

[0137] 232 First continuously variable transmission

[0138] 235 Second continuously variable transmission

[0139] Part of the wall (upper wall part)

[0140] 304 Oil supply circuit

[0141] 309 Oil drain port

[0142] 310 Oil replenishment port

[0143] 311 Oil replenishment circuit

[0144] 313 Second wall part (horizontal wall part)

[0145] 317 Oil drain circuit

[0146] 318 Groove

[0147] 319 Cover component Detailed implementation mode

[0148] 〔First embodiment〕

[0149] The first embodiment for implementing the present invention will be described based on the drawings. Note that in the following description, the direction of arrow F is set as "front side of the machine body" (refer to Figure 1 and Figure 2), set the direction of arrow B as "the rear side of the machine body" (refer to Figure 1 and Figure 2 ), set the direction of arrow L as "the left side of the machine body" (refer to Figure 2 ), set the direction of arrow R as "the right side of the machine body" (refer to Figure 2 ).

[0150] 〔Overall Structure of Riding-Type Transplanter〕

[0151] Figure 1 and Figure 2 show a riding-type transplanter (equivalent to the "paddy field working machine" of the present invention). In this riding-type transplanter, there are provided a pair of left and right front wheels 1, a pair of left and right rear wheels 2, a machine body frame 3, a driver's cab 4, and a transplanter 5 for transplanting seedlings on the paddy field surface (equivalent to the "working device" of the present invention). An engine E, a transmission M, a traveling HST 6 (equivalent to the "speed change device" of the present invention), and a plant spacing HST 7 (equivalent to the "continuously variable transmission device" of the present invention, refer to Figure 3 ) are provided at the front part of the machine body. Above the front part of the machine body, a receiving device 8 for receiving position information from a satellite of GPS (Global Positioning System) is provided. The driver's cab 4 is equipped with a driver's seat 9 for the driver to sit on and a steering handle 10 for steering operation.

[0152] 〔Transplanter〕

[0153] As shown in Figure 1 and Figure 2 , the transplanter 5 is supported by a link mechanism 11 so as to be able to move up and down at the rear part of the machine body frame 3. In the present embodiment, the transplanter 5 is composed of an eight-row planting type transplanter. However, the number of planting rows of the transplanter 5 is not limited to eight rows. The transplanter 5 is provided with a seedling table 12 for placing a mat-shaped seedling in an eight-row amount, a planting arm 13, a supply box (not shown), a planting transmission box 14, a rotating box 15, and a floating body 16.

[0154] The rotating box 15 is rotatably supported on the left and right side parts at the rear of the planting transmission box 14 respectively. The planting arm 13 takes out the seedlings from the seedling table 12 and plants them on the paddy field surface. The planting arms 13 are rotatably supported at the two free ends of the rotating box 15 respectively. The engine driving force from the said conveying box is transmitted to the rotating box 15 through the planting transmission box 14, so as to drive the rotating box 15 to rotate, and the seedlings are planted by the planting arms 13.

[0155] 〔Power Transmission Structure〕

[0156] As shown in Figure 1 and Figure 3As shown, the traveling HST6 is a continuously variable transmission device for changing the speed of the engine driving force. In the present embodiment, the traveling HST6 is composed of a hydrostatic continuously variable transmission device. The traveling HST6 is connected to the left side of the transmission M.

[0157] The row spacing HST7 is a continuously variable transmission device that changes the speed of power from the travel HST6 and transmits it to the rice transplanting device 5. In this embodiment, the row spacing HST7 is composed of a hydrostatic continuously variable transmission device.

[0158] The plant spacing HST 7 is provided with a pivot 17 for operating a swash plate (not shown). A drive mechanism 18 (electric motor, etc.) for driving the pivot 17 to rotate and an angle sensor 19 for detecting the rotation angle of the pivot 17 are provided.

[0159] A gear-type auxiliary transmission device (not shown) and a gear-type unequal speed transmission device 20 are built into the transmission case M. The unequal speed transmission device 20 changes the angular velocity of the output power relative to the input power. In the area before the planting arm 13 takes the seedlings from the seedling carrier 12 and plants them on the field surface, the unequal speed transmission device 20 can be used to make the rotation speed of the rotary box 15 slightly higher or lower.

[0160] like Figure 1 As shown, the driving force of the engine E is transmitted to the traveling HST6 via the transmission belt 21. Furthermore, the power after the speed change by the traveling HST6 is branched in parallel to the traveling transmission system and the working transmission system, the power of the traveling transmission system is transmitted to the left and right front wheels 1 and the left and right rear wheels 2 via the auxiliary transmission device, etc., and the power of the working transmission system is transmitted to the rice transplanting device 5 via the plant spacing HST7 and the unequal speed transmission device 20, etc.

[0161] 〔Control module〕

[0162] like Figure 3 As shown, the control module is provided with a control device 22, a setting spacing selection operation unit 23 (equivalent to the "setting interval selection operation unit" of the present invention), a receiving device 8, an angle sensor 19, a rear wheel speed sensor 24 (equivalent to the "wheel speed sensor" of the present invention), an input speed sensor 25 and an output speed sensor 26.

[0163] The rear wheel speed sensor 24 is provided inside the rear axle box to detect the speed of the rear wheel 2. The input speed sensor 25 is provided in the transmission case M to detect the speed of the power input to the plant spacing HST7 (in other words, the power output from the running HST6). The output speed sensor 26 is provided in the transmission case M to detect the speed of the power output from the plant spacing HST7.

[0164] The set plant spacing selection operation unit 23 selects the planting interval S (equivalent to the "operation interval" of the present invention) of the rice transplanter 5 on the paddy field surface from a plurality of set plant spacings. In the present embodiment, the set plant spacing selection operation unit 23 is constituted by a set operation screen provided in the driver's cab 4.

[0165] The control device 22 is provided with a gear shift setting unit 27, a vehicle speed calculation unit 28, and a planting interval adjustment unit 29 (equivalent to the "operation interval adjustment unit" of the present invention).

[0166] The gear shift setting unit 27 sets the gear shift of the plant spacing HST7 according to the set plant spacing selected by the set plant spacing selection operation unit 23. The drive mechanism 18 drives the pivot 17 to rotate based on an instruction from the gear shift setting unit 27. A plurality of gear shifts of the plant spacing HST7 corresponding to each of the plurality of set plant spacings are set step by step.

[0167] The vehicle speed calculation unit 28 calculates the actual vehicle speed of the machine body based on the position information received by the receiving device 8. The planting interval adjustment unit 29 adjusts the planting interval S according to the actual vehicle speed of the machine body calculated by the vehicle speed calculation unit 28 so that the actual plant spacing matches the set plant spacing (the set plant spacing selected by the set plant spacing selection operation unit 23). The drive mechanism 18 drives the pivot 17 to rotate based on an instruction from the planting interval adjustment unit 29.

[0168] Here, in the case where the receiving device 8 fails, the vehicle speed calculation unit 28 calculates the actual vehicle speed of the machine body based on the detection value of the rear wheel rotation speed sensor 24. At this time, the vehicle speed calculation unit 28 calculates the actual vehicle speed of the machine body based on the detection value of the rear wheel rotation speed sensor 24 in consideration of the slip ratio of a specified wheel. In the present embodiment, the design value is used as the slip ratio of the specified wheel. Further, in the case where the rear wheel rotation speed sensor 24 fails (both the receiving device 8 and the rear wheel rotation speed sensor 24 fail), the vehicle speed calculation unit 28 calculates the actual vehicle speed of the machine body based on the detection value of the input rotation speed sensor 25.

[0169] 〔Other embodiments related to the first embodiment〕

[0170] (1) In the above first embodiment, the "paddy field working machine" of the present invention is a riding type rice transplanter. However, instead, the "paddy field working machine" of the present invention may also be a seeder. In this case, the seeder is provided with: a seeding device (equivalent to the "operation device" of the present invention) that performs seeding on the paddy field surface; a continuously variable transmission device that variably transmits the power from the traveling HST6 to the seeding device; a set interval selection operation unit that selects and operates the seeding interval of the seeding device on the paddy field surface from a plurality of set intervals; and a gear shift setting unit 27 that sets the gear shift of the continuously variable transmission device according to the selected set interval.

[0171] (2) In the above first embodiment, the plant spacing selection operation unit 23 is constituted by a setting operation screen. However, instead, the plant spacing selection operation unit 23 may also be constituted by a lever.

[0172] (3) In the above first embodiment, the "wheel speed sensor" of the present invention is constituted by the rear wheel speed sensor 24. However, instead, the "wheel speed sensor" of the present invention may also be constituted by a front wheel speed sensor that detects the rotational speed of the front wheel 1.

[0173] (4) In the above first embodiment, the traveling HST 6 is constituted by a hydrostatic continuously variable transmission. However, instead, the "transmission device" of the present invention may also be constituted by a transmission device other than the hydrostatic continuously variable transmission (for example, a gear type transmission).

[0174] (5) In the above first embodiment, the plant spacing HST 7 is constituted by a hydrostatic continuously variable transmission. However, instead, the "continuously variable transmission" of the present invention may also be constituted by a continuously variable transmission other than the hydrostatic continuously variable transmission.

[0175] (6) In the above first embodiment, when the teeth of the detection gear for the rear wheel speed sensor 24 to detect are missing, the rotational speed of the rear wheel 2 may also be detected based on the rotation (pulse signal) trend of the detection gear.

[0176] (7) In the above first embodiment, when the rear wheel speed sensor 24 fails, the input speed sensor 25 is used as an alternative means. On the contrary, when the input speed sensor 25 fails, the rear wheel speed sensor 24 may also be used as an alternative means. For example, when the input speed sensor 25 fails (the receiving device 8 and the input speed sensor 25 fail), the vehicle speed calculation unit 28 may also calculate the actual vehicle speed of the machine body based on the detection value of the rear wheel speed sensor 24.

[0177] (8) In the above first embodiment, it is also possible to detect the position of the sub - shift lever that performs a shift operation on the sub - transmission device, and convert the detection values of the rear wheel speed sensor 24 and the input speed sensor 25 based on the position of the sub - shift lever. In addition, it is also possible to compare the detection values of the rear wheel speed sensor 24 and the input speed sensor 25, and judge the position of the sub - shift lever based on the comparison result of the detection values of the rear wheel speed sensor 24 and the input speed sensor 25.

[0178] 〔Second Embodiment〕

[0179] Hereinafter, the case where the second embodiment of the present invention is applied to a riding type transplanter as an example of a working machine will be described based on the drawings.

[0180] 〔Regarding the overall structure of a riding type rice transplanter〕

[0181] In the following description, regarding the body 101 of the riding type rice transplanter, the direction of the arrow F shown in Figure 4 and Figure 5 is set as the "front of the body", and the direction of the arrow B shown in Figure 4 and Figure 5 is set as the "rear of the body", the direction of the arrow R shown in Figure 5 is set as the "right side of the body", and the direction of the arrow L shown in Figure 5 is set as the "left side of the body".

[0182] As shown in Figure 4 and Figure 5 , the riding type rice transplanter is equipped with a body 101. The body 101 is equipped with left and right front wheels 102 as traveling devices that can be steered and driven, and is also equipped with left and right rear wheels 103 as traveling devices that can be driven. A prime mover part 105 is formed at the front part of the body 101, and the prime mover part 105 has an engine 104 as a prime mover. A riding type driver's cab 108 is formed at the rear part of the body 101, and the driver's cab 108 is provided with a driver's seat 106 and a steering wheel 107 for steering the front wheels 102.

[0183] A rice transplanting device 120 is connected to the rear part of the body 101 via a link mechanism 109. The rice transplanting device 120 is lifted and lowered between a lowering operation state and a rising non-operation state by the up and down swinging movement of the link mechanism 109 relative to the body 101. On the left and right sides in the lateral direction at the front part of the body 101, there are provided preliminary seedling storage devices 110. The left and right preliminary seedling storage devices 110 each have three preliminary seedling trays 111. The three preliminary seedling trays 111 can be switched between an extended state for use in which the three preliminary seedling trays 111 are arranged in a row in the front-rear direction of the body 101 and a folded state in which the three preliminary seedling trays 111 are stacked on top of each other in three layers. An antenna unit 113 for satellite navigation is supported across the support columns 112 of the left preliminary seedling storage device 110 and the support columns 112 of the right preliminary seedling storage device 110. A fertilizer application device 114 is provided at the rear part of the body 101. When transplanting rice seedlings using the rice transplanting device 120, the fertilizer application device 114 can supply fertilizer to the vicinity of the planted rice seedlings.

[0184] 〔Regarding the structure of the rice transplanting device 120〕

[0185] As shown in Figure 4 and Figure 5As shown, the rice transplanter 120 includes a planting body 120A, and the planting body 120A is composed of four planting drive boxes 121 arranged side by side at intervals in the lateral width direction of the machine body 101, etc. On the lateral two sides of the rear parts of the four planting drive boxes 121, there are provided rice transplanting mechanisms 122 as working parts. A total of eight rice transplanting mechanisms 122 are provided. As Figure 5 , Figure 9 shown, the eight rice transplanting mechanisms 122 respectively include a rotary rotor 122a rotatably supported by the planting drive box 121 and planting arms 122b rotatably supported at both end portions of the rotary rotor 122a respectively. On a pair of planting arms 122b, there are respectively provided planting claws 122c.

[0186] Above the front part of the planting body 120A, there is provided a seedling tray 123 as an agricultural material supply part. As Figure 5 shown, on the seedling tray 123, there are formed eight seedling placement parts 123a provided corresponding to the eight rice transplanting mechanisms 122 one by one. That is, the seedlings supplied to the eight rice transplanting mechanisms 122 are placed side by side in the lateral width direction of the planting body 120A on the seedling tray 123 for storage. In the eight seedling placement parts 123a, there are respectively provided seedling longitudinal conveyor belts 124.

[0187] If the rice transplanter 120 descends to the descending operation state and is operated to the driving state, power is transmitted from the engine 104 to a supply box 125 (refer to Figure 4 ) supported at the front part of the planting body 120A, and is respectively input from the supply box 125 to the four planting drive boxes 121. The eight rice transplanting mechanisms 122 are respectively driven by the power of the planting drive boxes 121 to perform a rotational movement for rice transplanting between the lower end side of the seedling tray 123 and the paddy field surface. If the rice transplanting mechanism 122 performs a rotational movement, the planting claws 122c of a pair of planting arms 122b alternately perform rotational movement up and down between the seedling outlet and the paddy field surface. The planting claws 122c of each of the pair of planting arms 122b take out the planting seedlings from the seedlings on the seedling tray 123 at the seedling outlet, and convey the taken-out planting seedlings downward for planting on the paddy field surface. The seedling outlet is formed on the lower end side of the seedling tray 123 by using a guide rail 126.

[0188] A seedling lateral conveying mechanism (not shown) is provided across the seedling mounting table 123 and the supply box 125. The seedling lateral conveying mechanism is driven in conjunction with the power of the supply box 125 and the rotational movement of the transplanting mechanism 122, and the seedling mounting table 123 is reciprocally moved in the lateral width direction of the planting machine body 120A in conjunction with the rotational movement of the seedling lateral conveying mechanism and the transplanting mechanism 122. Thus, the seedlings placed on the eight seedling placement parts 123a are reciprocally moved laterally relative to the transplanting mechanism 122, and the eight transplanting mechanisms 122 sequentially take out the planting seedlings from one end side to the other end side in the lateral width direction of the seedlings placed on the seedling placement parts 123a.

[0189] If the seedling mounting table 123 reaches the stroke end in the left and right lateral movement, the power of the supply box 125 is used to drive a seedling longitudinal conveying mechanism (not shown) provided across the seedling mounting table 123 and the supply box 125, and the seedling longitudinal conveyor belts 124 of the respective eight seedling placement parts 123a are driven by the seedling longitudinal conveying mechanism (not shown). That is, every time the seedling mounting table 123 reaches the stroke end in the left and right lateral movement, the seedlings placed on the eight seedling placement parts 123a are longitudinally conveyed to the transplanting mechanism 122 by the seedling longitudinal conveyor belts 124 by an amount corresponding to the length in the longitudinal direction of the planting seedlings taken out by the transplanting mechanism 122.

[0190] In the transplanting device 120, the machine body 101 travels in the state of descending to the lowering operation state, so that the power transmitted from the engine 104 to the supply box 125 is used to drive the eight transplanting mechanisms 122, the seedling mounting table 123, and the seedling longitudinal conveyor belts 124, and the eight transplanting mechanisms 122 perform transplanting in an eight-row planting method. The transplanting of one row amount performed by each of the eight transplanting mechanisms 122 is carried out at a plant spacing D (refer to Figure 9 ) by the alternate transplanting of a pair of planting claws 122c. The plant spacing D is the planting interval in the traveling direction of the machine body 101.

[0191] 〔Regarding the structure of power transmission〕

[0192] As Figure 4 shown, a transmission 130 is provided behind the engine 104. The transmission 130 forms the front part of the machine body 101. As Figure 6 shown, the front wheel drive box parts 131 extend from the two lateral parts at the lower part of the transmission 130 to the lateral outside of the machine body. The transmission 130 rotatably supports the left and right front wheels 102 by means of the left and right front wheel drive box parts 131.

[0193] As Figure 6 、 Figure 7As shown, a hydrostatic first continuously variable transmission 132, which serves as a speed change device for traveling and working, is supported on a transmission 130. The first continuously variable transmission 132 is supported at a portion on the upper part of the transmission 130 at the left outer side in the lateral direction. As Figure 4 shown, an output shaft of an engine 104 and an input shaft 132a of the first continuously variable transmission 132 (refer to Figure 6 ) are linked together in a linked manner through a power transmission belt 133. The power of the engine 104 is input into the first continuously variable transmission 132 through the power transmission belt 133. The input shaft 132a of the first continuously variable transmission 132 is a pump shaft provided in a hydraulic pump that constitutes the first continuously variable transmission 132.

[0194] In the first continuously variable transmission 132, by rotating a speed change operation shaft 132b (refer to Figure 6 ) that is rotatably supported by a housing, the swash plate angle of a hydraulic pump (not shown) is changed to shift to a neutral speed change state, a forward speed change state, and a reverse speed change state. If the first continuously variable transmission 132 shifts to the neutral speed change state, an output shaft 132c of the first continuously variable transmission 132 (refer to Figure 6 ) stops. The output shaft 132c of the first continuously variable transmission 132 is a motor shaft provided in a hydraulic motor that constitutes the first continuously variable transmission 132. If the first continuously variable transmission 132 shifts to the forward speed change state, the power from the engine 104 is converted into forward power by the hydraulic pump and the hydraulic motor, and becomes a speed change power with continuously variable rotational speed and is output from the output shaft 132c. If the first continuously variable transmission 132 shifts to the reverse speed change state, the power from the engine 104 is converted into reverse power by the hydraulic pump and the hydraulic motor, and becomes a speed change power with continuously variable rotational speed and is output from the output shaft 132c.

[0195] As Figure 7 shown, a hydrostatic second continuously variable transmission 135, which serves as a continuously variable transmission for working, is supported on the transmission 130. The second continuously variable transmission 135 is supported at a portion on the upper part of the transmission 130 at the right outer side in the lateral direction. At a portion of an input shaft 135a of the second continuously variable transmission 135 that protrudes outside the housing, a cooling fan 136 is supported in a non-rotatable relative manner. The input shaft 135a of the second continuously variable transmission 135 is a pump shaft provided in a hydraulic pump that constitutes the second continuously variable transmission 135.

[0196] As Figure 6 、 Figure 7 shown, a branch shaft 137 as a branch portion, a sub-speed change device 140 for traveling, a front-wheel differential mechanism 150, a reduction mechanism 160 for working, and a working portion speed change device 170 are provided inside the transmission 130. AsFigure 6 As shown, a rear wheel output shaft 180 is rotatably supported by a first output boss portion 130c formed at the rear of the transmission 130. As Figure 7 shown, a work output shaft 189 is rotatably supported by a second output boss portion 130d formed at the rear of the transmission 130. A work unit clutch 190 is provided in a portion of the work output shaft 189 that is inside the second output boss portion 130d.

[0197] As Figure 9 shown, a power transmission device Sa for traveling and work is constituted by a branch shaft 137, a sub-speed change device 140, a second continuously variable transmission device 135, a reduction mechanism 160, a work unit speed change device 170, a work unit clutch 190, etc. A traveling power transmission system X in the power transmission device Sa is constituted by the sub-speed change device 140, etc. A work power transmission system Y in the power transmission device Sa is constituted by the second continuously variable transmission device 135, the reduction mechanism 160, the work unit speed change device 170, the work unit clutch 190, etc.

[0198] In the power transmission device Sa, the speed-changed power after being speed-changed by the first continuously variable transmission device 132 is input from the output shaft 132c to the branch shaft 137, and is branched into traveling power and work power by the branch shaft 137. The branched traveling power is output to the front wheels 102 and the rear wheels 103 by the traveling power transmission system X. Specifically, the branched traveling power is input to the traveling sub-speed change device 140 and is output from the sub-speed change device 140 to the front wheels 102 and the rear wheels 103. The branched work power is output to the transplanting mechanism 122 of the transplanting device 120, etc. by the work power transmission system Y. Specifically, the branched work power is first input to the second continuously variable transmission device 135, then input from the second continuously variable transmission device 135 to the reduction mechanism 160, then input from the reduction mechanism 160 to the work unit speed change device 170, then input from the work unit speed change device 170 to the work unit clutch 190, and is output from the work unit clutch 190 to the transplanting mechanism 122 of the transplanting device 120, etc. That is, the second continuously variable transmission device 135, the reduction mechanism 160, the work unit speed change device 170, and the work unit clutch 190 provided in the work power transmission system Y are provided in a state where the order is the same as the order in which the second continuously variable transmission device 135, the reduction mechanism 160, the work unit speed change device 170, and the work unit clutch 190 output to the transplanting mechanism 122 of the transplanting device 120, etc.

[0199] 〔Regarding the structure of the branch shaft 137〕

[0200] Specifically, as Figure 6 , Figure 7As shown, the branch shaft 137 is rotatably supported by the left and right transverse wall portions of the transmission 130. The end portion of the branch shaft 137 on the left transverse wall portion side and the output shaft 132c of the first continuously variable transmission 132 are connected in a non-rotatable relative manner by spline engagement. The end portion of the branch shaft 137 on the right transverse wall portion side and the input shaft 135a of the second continuously variable transmission 135 are connected in a non-rotatable relative manner by a connecting member 138. At the middle portion of the branch shaft 137, two input gears 141, 142 of the auxiliary transmission 140 for traveling are provided in a non-rotatable relative manner. The variable power output by the first continuously variable transmission 132 is branched by the branch shaft 137 into traveling power and working power. The branched traveling power is input to the auxiliary transmission 140 for traveling, and the branched working power is input to the second continuously variable transmission 135.

[0201] 〔For the auxiliary transmission 140 for traveling〕

[0202] As Figure 6 shown, the auxiliary transmission 140 for traveling, in addition to having two input gears 141, 142 provided on the branch shaft 137 in a non-rotatable relative manner, further has an output shaft 143 parallel to the branch shaft 137 and a shift gear 144 supported on the spline portion of the output shaft 143 in a slidable and non-rotatable relative manner.

[0203] In the auxiliary transmission 140 for traveling, by sliding the shift gear 144, it is changed to the low-speed side variable state by engaging the large-diameter side gear portion 144a of the shift gear 144 with the small-diameter side input gear 141, and it is changed to the high-speed side variable state by engaging the small-diameter side gear portion 144b of the shift gear 144 with the large-diameter side input gear 142. In the auxiliary transmission 140 for traveling, when shifting to either the low-speed side or the high-speed side variable state, the traveling power branched by the branch shaft 137 is transmitted to the output shaft 143 by the shift gear 144, and is transmitted from the output shaft 143 to the input shaft 151 of the front-wheel differential mechanism 150 via the gear linkage mechanism 145.

[0204] 〔For the structure of the front-wheel differential mechanism 150〕

[0205] In the front-wheel differential mechanism 150, as Figure 6 shown, the traveling power transmitted to the input shaft 151 is transmitted to the gearbox 152 that cannot rotate relative to the input shaft 151, and is transmitted from the gearbox 152 to the left and right front-wheel drive shafts 154 via the differential gear mechanism portion 153.

[0206] 〔For the structure of the rear-wheel output shaft 180〕

[0207] AsFigure 6 As shown, the output shaft 180 for the rear wheels has an input gear 182, which is formed at the end within the transmission in the output shaft 180 for the rear wheels in a non-rotatable relative manner. A power transmission gear 155 is provided on the input shaft 151 of the front-wheel differential mechanism 150 in a non-rotatable relative manner, and the input gear 182 meshes with the power transmission gear 155.

[0208] In the output shaft 180 for the rear wheels, the traveling power transmitted from the sub-transmission device 140 for traveling to the input shaft 151 of the front-wheel differential mechanism 150 is input by means of the power transmission gear 155 and the input gear 182, and the input traveling power is output from the end on the side opposite to the input side of the output shaft 180 for the rear wheels. The traveling power output from the output shaft 180 for the rear wheels is transmitted to the rear-wheel drive case 183 by a rotary shaft 184 extending from the output shaft 180 for the rear wheels to the rear-wheel drive case 183 as shown in Figure 4 the figure.

[0209] A multi-disc friction brake 185 is mounted on the output shaft 180 for the rear wheels. In the friction brake 185, by rotating an operation shaft 186 rotatably supported by a first output boss portion 130c by means of an operation arm 187, it is switched to an engaged state in which the friction plate is pressed by a pressing member 188 and a separated state in which the pressing of the friction plate by the pressing member 188 is released.

[0210] 〔Regarding the structure of the second continuously variable transmission 135〕

[0211] As shown in Figure 7 and Figure 8 the figure, the second continuously variable transmission 135 has a transmission operation shaft 135b rotatably supported by a housing. In the second continuously variable transmission 135, by rotating the transmission operation shaft 135b, the swash plate angle of a hydraulic pump is changed to shift to a neutral transmission state, a forward rotation side transmission state, and a reverse rotation side transmission state. If the second continuously variable transmission 135 shifts to the neutral transmission state, the output shaft 139 of the second continuously variable transmission 135 stops. If the second continuously variable transmission 135 shifts to the forward rotation side transmission state, the working power input to the input shaft 135a from the branch shaft 137 is converted into forward rotation power and becomes a transmission power with continuously variable rotational speed and is output from the output shaft 139.

[0212] 〔Regarding the working reduction mechanism 160〕

[0213] As shown in Figure 7 and Figure 8As shown, a reduction mechanism 160 for work is provided across the output shaft 139 of the second continuously variable transmission 135 and the transmission cylinder shaft 161 that is externally fitted to the output shaft 139 in a relatively rotatable manner. Specifically, as Figure 6 shown, the output shaft 139 of the second continuously variable transmission 135 includes an output shaft main body 139A and an extended output shaft 139B. The reduction mechanism 160 for work is provided across the extended output shaft 139B in the output shaft 139 and the end portion on the side of the second continuously variable transmission of the transmission cylinder shaft 161.

[0214] Specifically, as Figure 8 shown, the reduction mechanism 160 includes: an input gear 162 that is provided on the output shaft 139 in a non-rotatable relative manner; a first intermediate gear 163 that is supported on the output shaft 171 of the work unit transmission 170 in a relatively rotatable manner; a second intermediate gear 164 that is provided on the boss portion of the first intermediate gear 163 in a non-rotatable relative manner; and an output gear 165 that is provided on the transmission cylinder shaft 161 in a non-rotatable relative manner in a state of meshing with the second intermediate gear 164. The input gear 162 is provided on the extended output shaft 139B in the output shaft 171. The output gear 165 is provided on the end side portion on the side of the second continuously variable transmission in the transmission cylinder shaft 161.

[0215] In the reduction mechanism 160 for work, the variable power output from the second continuously variable transmission 135 is decelerated between the input gear 162 and the first intermediate gear 163, and further decelerated between the second intermediate gear 164 and the output gear 165 and transmitted from the output gear 165 to the transmission cylinder shaft 161.

[0216] 〔Regarding the structure of the work unit transmission 170〕

[0217] As Figure 7 、 Figure 8 shown, the work unit transmission 170 includes four input side gears 172 as input side components that are provided on the transmission cylinder shaft 161 in a non-rotatable relative manner and four output side gears 173 that are provided on the output shaft 171 in a relatively rotatable manner. The input side gears 172 are provided on the end portion on the side of the transmission cylinder shaft 161 opposite to the end side where the reduction mechanism 160 is provided. As Figure 10 shown, the four input side gears 172 are arranged in parallel at intervals separated by a gasket 198.

[0218] The first input-side gear 172a among the four input-side gears 172 meshes with the first output-side gear 173a among the four output-side gears 173, the second input-side gear 172b among the four input-side gears 172 meshes with the second output-side gear 173b among the four output-side gears 173, the third input-side gear 172c among the four input-side gears 172 meshes with the third output-side gear 173c among the four output-side gears 173, and the fourth input-side gear 172d among the four input-side gears 172 meshes with the fourth output-side gear 173d among the four output-side gears 173.

[0219] The first input-side gear 172a and the first output-side gear 173a are composed of circular gears with the same outer diameter. The second input-side gear 172b, the third input-side gear 172c, the fourth input-side gear 172d, the second output-side gear 173b, the third output-side gear 173c, and the fourth output-side gear 173d are composed of elliptical gears, eccentric gears, or non-circular gears.

[0220] As Figure 8 , Figure 10 shown, the working part speed change device 170 includes a key groove 174 formed on the output shaft 171, a speed change key 175 that can be slidably received in the key groove 174, and a speed change operation shaft 176 that can be slidably supported by the boss portion 130e of the transmission case 130 and the output shaft 171. The end portion of the speed change operation shaft 176 on the output shaft side is engaged with the end portion of the speed change key 175 in a manner that can be pushed and pulled.

[0221] In the working part speed change device 170, by sliding the speed change operation shaft 176, the speed change key 175 is moved in the key groove 174, so that the key projection portion 177 of the speed change key 175 faces one of the four output-side gears 173 alternatively, and the key projection portion 177 is engaged with the engagement groove 178 of the output-side gear 173, thereby changing to four speed change states. When the key projection portion 177 is engaged with the engagement groove 178 of each of the four output-side gears 173, the positioning sphere 196 is pressed against the speed change key 175 by the positioning spring 197, and the speed change key 175 is positioned at each speed change position by the positioning sphere 196. The key projection portion 177 is manufactured by precision blanking or sintering. As Figure 10 shown, the lower swing portion 177a of the key projection portion 177 is formed in a cliff shape so as not to enter the engagement groove 178 of the output-side gear 173 adjacent to the output-side gear 173 into which the key projection portion 177 is engaged.

[0222] That is, in the operation unit speed change device 170, if the key projection 177 engages with the engagement groove 178 of the first output side gear 173a, the speed is changed to the first speed change state. In the case of changing to the first speed change state, the first output side gear 173a and the output shaft 171 are connected by the key projection 177 in a non-rotatable relative manner, and the working power transmitted to the transmission cylinder shaft 161 by the speed reduction mechanism 160 is transmitted to the output shaft 171 via the first input side gear 172a, the first output side gear 173a, and the key projection 177. The angular velocity of one rotation of the output shaft 171 does not change, and the working power of constant speed rotation with the same rotation speed for one rotation is output from the output gear 179 of the output shaft 171.

[0223] In the operation unit speed change device 170, if the key projection 177 engages with the engagement groove 178 of the second output side gear 173b, the speed is changed to the second speed change state. If the key projection 177 engages with the engagement groove 178 of the third output side gear 173c, the speed is changed to the third speed change state. If the key projection 177 engages with the engagement groove 178 of the fourth output side gear 173d, the speed is changed to the fourth speed change state. In the case of any one of the second speed change state, the third speed change state, and the fourth speed change state, the output side gears 173b, 173c, 173d corresponding to the speed change state and the output shaft 171 are all connected by the key projection 177 in a non-rotatable relative manner, and the working power transmitted to the transmission cylinder shaft 161 by the speed reduction mechanism 160 is transmitted to the output shaft 171 via the input side gears 172b, 172c, 172d corresponding to the speed change state, the output side gears 173b, 173c, 173d, and the key projection 177. The angular velocity of one rotation of the output shaft 171 changes between high and low, and the working power of non-constant speed rotation with a fast or slow rotation speed for one rotation is output from the output gear 179. In the case of changing to the second speed change state, the case of changing to the third speed change state, and the case of changing to the fourth speed change state, the positions of the parts that become rapid during one rotation are different, or even if the parts that become rapid are the same, the speeds at the rapid parts are different.

[0224] 〔Regarding the structure of the operation unit clutch 190〕

[0225] As Figure 8As shown, the working unit clutch 190 is disposed at a position downstream of the working unit speed change device 170 in the transmission direction. Specifically, the working unit clutch 190 is disposed between the output gear 179 of the working unit speed change device 170 and the working output shaft 189. The working power of constant velocity rotation and non-constant velocity rotation output from the working unit speed change device 170 is input to the input side clutch member 191 of the working unit clutch 190 in the original rotation state, and is transmitted from the output side clutch member 192 of the working unit clutch 190 to the working output shaft 189.

[0226] In the working unit clutch 190, the operation shaft 193 that can be slidably supported by pressing operation against the inside of the second output boss portion 130d is pressed, so that the front end portion 193a of the operation shaft 193 abuts against the stop cam portion 192a at the fixed position of the output side clutch member 192, and the output side clutch member 192 is operated against the spring 194 to be separated from the input side clutch member 191 to be in a separated state, and the power transmission to the transplanter 120 is cut off by the working unit clutch 190. By pulling the operation shaft 193 outward of the second output boss portion 130d, the front end portion 193a of the operation shaft 193 is separated from the output side clutch member 192, and the output side clutch member 192 is operated by the spring 194 to engage with the input side clutch member 191 to be in an engaged state, and the power transmission to the transplanter 120 is turned on by the working unit clutch 190.

[0227] 〔Structure of the working output shaft 189〕

[0228] The working output shaft 189 is linked to the input shaft of the supply box 125 via the rotary shaft 181 (refer to Figure 1 ). The working power of constant velocity rotation and non-constant velocity rotation transmitted from the working unit clutch 190 to the working output shaft 189 is transmitted to the supply box 125 via the rotary shaft 181 in the original rotation state. The working power of constant velocity rotation and non-constant velocity rotation transmitted to the supply box 125 is transmitted to the eight transplanting mechanisms 122 via the planting drive box 121 in the original rotation state.

[0229] When the vehicle is moving and not carrying out planting operations, the vehicle is traveling with the auxiliary transmission device 140 at the high speed side. When carrying out planting operations, the vehicle is traveling with the auxiliary transmission device 140 at the low speed side. During planting operations, the first continuously variable transmission device 132 is shifted so that the power of the engine 104 is transmitted to the front wheels 102 and the rear wheels 103 by the first continuously variable transmission device 132, thereby changing the travel speed of the vehicle body 101. Even if the traveling speed of the machine body 101 is changed, the speed change power of the first continuously variable transmission device 132 is transmitted to the transplanting mechanism 122 so that the rotation speed of the transplanting mechanism 122 changes in conjunction with the traveling speed of the machine body 101. No matter how the traveling speed of the machine body 101 changes, the plant spacing D1 of the width set according to the speed change state of the second continuously variable transmission device 135 pre-shifted is maintained to transplant rice using the transplanting mechanism 122.

[0230] By performing a speed change operation on the second continuously variable transmission 135, the working power from the branch shaft 137 is speed-changed and transmitted to the rice transplanting mechanism 122, and the rotation speed of the rice transplanting mechanism 122 per rotation is changed independently of the travel speed of the machine body 101. Thus, the rice transplanting mechanism 122 is used to transplant rice with a plant spacing D2, which is a width set according to the speed change state of the second continuously variable transmission 135 after the speed change operation, and is a plant spacing of a width different from the plant spacing D1 of the width before the speed change operation of the second continuously variable transmission 135.

[0231] When the spacing D is changed to a spacing that is not too wide or not too narrow, the working unit speed change device 170 is shifted to the first speed change state. Next, the working power for constant rotation set by the working unit speed change device 170 is transmitted to the rice transplanting mechanism 122, that is, the rotation speed of the rice transplanting mechanism 122 for one rotation is set to a constant speed according to the first speed change state of the working unit speed change device 170, and the rice transplanting mechanism 122 performs the rotational movement at a rotation speed that is equal to the rotation speed for one rotation, while transplanting rice.

[0232] When changing the plant spacing D to a wider or narrower plant spacing, the working part speed change device 170 is shifted to the second speed change state, the third speed change state, or the fourth speed change state corresponding to the width of the changed plant spacing D. In this way, the non-uniform rotational working power set according to the speed change state of the working part speed change device 170 is transmitted to the transplanting mechanism 122, that is, the rotational speed of one revolution of the transplanting mechanism 122 is made to have a speed corresponding to the width of the plant spacing D by the working part speed change device 170, and the moving speed when the planting claw 122c inserts into the paddy field surface becomes higher than the moving speed when the planting claw 122c is in a position above the paddy field surface, or the moving speed when the planting claw 122c inserts is lower than the moving speed when the planting claw 122c is in a position above the paddy field surface, and the transplanting mechanism 122 performs transplanting. Regardless of the width of the plant spacing D, transplanting is performed in a state where the paddy field surface is not disturbed by the planting claw 122c or the planting seedlings are not pulled out of the paddy field surface by the planting claw 122c.

[0233] By switching the operation of the working part clutch 190 to the disengaged state, the power transmission to the transplanting device 120 is cut off by the working part clutch 190, and the transplanting mechanism 122 stops. At this time, due to the action of the fixed position stop cam portion 192a, the transplanting mechanism 122 stops at the rotational position where the pair of planting claws 122c are respectively in positions above the paddy field surface.

[0234] As Figure 6 、 Figure 7 shown, the transmission 130 includes a case main body 130A and a case cover portion 130B that closes the lateral opening of the case main body 130A. The case cover portion 130B is connected to the end portion of the case main body 130A having the lateral opening by connecting bolts (not shown). The transmission 130 can be divided into the case main body 130A and the case cover portion 130B.

[0235] As Figure 6 、 Figure 7 shown, the first continuously variable transmission 132 is supported outside the case main body 130A. As Figure 7 shown, the second continuously variable transmission 135 is supported outside the case cover portion 130B. As Figure 6 、 Figure 7 shown, the working part speed change device 170 and the sub-speed change device 140 for traveling are provided inside the case main body 130A. As Figure 7 shown, the reduction mechanism 160 is provided inside the case cover portion 130B.

[0236] As Figure 6As shown, the output shaft main body 139A of the output shaft 139 of the second continuously variable transmission 135 is inserted into the inside of the case cover portion 130B from the outside of the case cover portion 130B. The extended output shaft 139B of the output shaft 139 is connected to the portion of the output shaft main body 139A located inside the transmission in a separable and non-rotatable relative manner. Since the reduction mechanism 160 and the transmission cylinder shaft 161 are provided on the extended output shaft 139B, by separating the extended output shaft 139B from the output shaft main body 139A, the reduction mechanism 160 and the input side gear 172 of the working part transmission 170 are separated from the second continuously variable transmission 135 together with the extended output shaft 139B.

[0237] 〔Regarding the structure of the shift key 175〕

[0238] Figure 10 The shift key 175 shown by the solid line in the figure is the shift key operated to the shift position where the key projection 177 is engaged in the engagement groove 178 of the second output side gear 173b, and this shift key 175 is positioned at this shift position by the positioning sphere 196 and the positioning spring 197. When the shift key 175 is operated to the shift position where the key projection 177 is engaged in the engagement groove 178 of any one of the first output side gear 173a to the fourth output side gear 173d, the shift key 175 is positioned at this shift position by the positioning sphere 196 and the positioning spring 197.

[0239] As Figure 11 , Figure 12 shown, the key projection 177 has a pulling side inclined portion K1 and a pressing side inclined portion K2. When performing a pulling shift operation that moves the shift key 175 in a pulling manner, the pulling side inclined portion K1 of the key projection 177 receives an operating reaction force from the gasket 198 between the output side gears. When performing a pressing shift operation that moves the shift key 175 in a pressing manner, as Figure 11 , Figure 12 shown, the pressing side inclined portion K2 of the key projection 177 receives an operating reaction force Z from the gasket 198 between the output side gears. When performing either a pulling shift operation or a pressing shift operation, as Figure 10 shown by the double-dashed line, through the operating reaction force received from the gasket 198, the key projection side of the shift key 175 swings toward the positioning sphere 196 with the portion supported by the shift operation shaft 176 as the swing fulcrum. Through this swing, while elastically deforming the positioning spring 197 toward the compression side, the key projection 177 is pulled out from the engagement groove 178. When performing a pulling shift operation, the contact angle of the pulling side inclined portion K1 with respect to the gasket 198 continuously decreases, and when performing a pressing shift operation, the contact angle of the pressing side inclined portion K2 with respect to the gasket 198 continuously increases. When performing a pressing shift operation, as Figure 11 , Figure 12As shown, the first component force Zy of the operating reaction force Z that the pressing-side inclined portion K2 receives from the cushion 198 becomes the operating force that elastically deforms the positioning spring 197, and the second component force Zx of the operating reaction force Z becomes the resistance to the speed change operation.

[0240] In Figure 11 the speed change key 175 shown, the inclination angle θ1 of the pressing-side inclined portion K2 is set to be gentler than the inclination angle θ of the pulling-side inclined portion K1. In Figure 12 the speed change key 175 shown, the inclination angle θ2 of the pressing-side inclined portion K2 is the same as the inclination angle θ of the pulling-side inclined portion K1. As Figure 11 , Figure 12 shown, when the inclination angle of the pressing-side inclined portion K2 is gentler than the inclination angle of the pulling-side inclined portion K1, the second component force Zx of the operating reaction force Z that the speed change key 175 receives is smaller than the second component force Zx of the operating reaction force Z that the speed change key 175 receives when the inclination angle of the pressing-side inclined portion K2 is equal to the inclination angle of the pulling-side inclined portion K1.

[0241] By setting the inclination angle of the pressing-side inclined portion K2 of the key projection 177 to be gentler than the inclination angle of the pulling-side inclined portion K1, the resistance to the speed change operation that the speed change key 175 receives during the pressing speed change operation can be made smaller than the resistance to the speed change operation that the speed change key 175 receives when the inclination angle of the pressing-side inclined portion K2 is equal to the inclination angle of the pulling-side inclined portion K1, so that the resistance to the speed change operation during the pressing speed change operation is equal to or approximately equal to the resistance to the speed change operation during the pulling speed change operation, and the speed change operation can be performed with a good operating feeling.

[0242] (Other embodiments related to the second embodiment)

[0243] (1) In the above second embodiment, an example in which the speed change device 132 for traveling and working is constituted by a hydrostatic continuously variable transmission is shown, but it is not limited thereto, and the speed change device 132 may also be constituted by a gear type speed change device. In addition, the speed change device 132 may also be constituted by a continuously variable transmission formed by combining a belt type continuously variable transmission and a forward and reverse switching device.

[0244] (2) In the above second embodiment, an example in which the continuously variable transmission 135 for working is constituted by a hydrostatic continuously variable transmission is shown, but it is not limited thereto, and the continuously variable transmission 135 may also be constituted by a belt type continuously variable transmission.

[0245] (3) In the above second embodiment, an example of the working portion speed change device 170 having a structure in which the speed change key 175 acts on the output side gear 173 is shown, but a working portion speed change device having a structure in which the speed change key 175 acts on the input side gear 172 may also be adopted.

[0246] (4) In the above second embodiment, an example is shown in which the output shaft 139 of the continuously variable transmission 135 for work includes an output shaft main body 139A and an extended output shaft 139B. However, it is not limited thereto, and the output shaft 139 may also be implemented by a single output shaft.

[0247] (5) In the above second embodiment, an example of including a rice transplanter 120 that supplies seedlings as agricultural materials to the paddy field surface is described. However, it is not limited thereto. It may also include a working device that supplies rice seeds, liquid or granular chemicals, and liquid or granular fertilizers as agricultural materials to the paddy field surface.

[0248] (6) In the above second embodiment, an example of providing an engine 104 as a prime mover is shown. However, it is not limited thereto, and an electric motor may also be used as the prime mover. In addition, a prime mover that combines an engine and an electric motor may also be used.

[0249] (7) In the above second embodiment, an example of using the front wheels 102 and the rear wheels 103 as a traveling device is shown. However, it is not limited thereto, and a crawler traveling device can be used as the traveling device. In addition, a traveling device that combines wheels and a small crawler can be used.

[0250] 〔Third Embodiment〕

[0251] Hereinafter, a case where the third embodiment of the present invention is applied to a riding type rice transplanter as an example of a working machine will be described based on the drawings.

[0252] 〔Regarding the overall structure of the riding type rice transplanter〕

[0253] In the following description, regarding the body 201 of the riding type rice transplanter, the Figure 13 、 Figure 14 direction of the arrow F shown is set as "front of the body", the Figure 13 、 Figure 14 direction of the arrow B shown is set as "rear of the body", the Figure 14 direction of the arrow R shown is set as "right side of the body", and the Figure 14 direction of the arrow L shown is set as "left side of the body".

[0254] As Figure 13 、 Figure 14As shown in the figure, a riding type rice transplanter includes a machine body 201, and the machine body 201 is equipped with left and right front wheels 202 as traveling devices that can be steered and driven, and is also equipped with left and right rear wheels 203 as traveling devices that can be driven. A power unit having an engine 204 as a prime mover is formed at the front of the machine body 201. A riding type driver's cab 208 is formed at the rear of the machine body 201, and the driver's cab 208 includes a driver's seat 206 and a steering wheel 207 for steering the front wheels 202. The steering operation of the steering wheel 207 on the front wheels 202 is carried out via a torque generator 300 (refer to Figure 20 ).

[0255] A rice transplanting device 220 as a working device is connected to the rear of the machine body 201 via a link mechanism 209. The rice transplanting device 220 is lifted and lowered between a lowering working state and a rising non-working state by the up and down swinging motion of the link mechanism 209 relative to the machine body 201. The swinging operation of the link mechanism 209 relative to the machine body 201 is carried out by the telescopic action of a hydraulic lifting cylinder 301. Preparation seedling storage devices 210 are provided on the left and right sides in the lateral direction at the front of the machine body 201. The left and right preparation seedling storage devices 210 each have three preparation seedling placing tables 211. The three preparation seedling placing tables 211 can be switched between an extended state for use arranged in a row in the front-rear direction of the machine body 201 and a folded state where they are stacked on top of each other in three layers. An antenna unit 213 for satellite navigation is supported across the support columns 212 of the left preparation seedling storage device 210 and the support columns 212 of the right preparation seedling storage device 210. A fertilizer application device 214 is provided at the rear of the machine body 201. When transplanting rice using the rice transplanting device 220, the fertilizer application device 214 can supply fertilizer to the vicinity of the planted seedlings.

[0256] 〔Regarding the structure of the rice transplanting device 220〕

[0257] As Figure 13 、 Figure 14 shown, the rice transplanting device 220 includes a planting machine body 220A, and the planting machine body 220A is composed of four planting drive boxes 221 arranged side by side at intervals in the lateral width direction of the machine body 201, etc. At the lateral two sides of the rear of each of the four planting drive boxes 221, rice transplanting mechanisms 222 as working parts are provided. A total of eight rice transplanting mechanisms 222 are provided. As Figure 14 、 Figure 18 shown, each of the eight rice transplanting mechanisms 222 includes a rotary rotor 222a rotatably supported by the planting drive box 221 and planting arms 222b rotatably supported at both end portions of the rotary rotor 222a respectively. Planting claws 222c are respectively provided on a pair of planting arms 222b.

[0258] Above the front part of the planting machine body 220A, a seedling placing table 223 serving as an agricultural material supply part is provided. As Figure 14 shown, on the seedling placing table 223, eight seedling placement parts 223a are formed corresponding to the eight transplanting mechanisms 222 one by one. That is, the seedlings supplied to the eight transplanting mechanisms 222 are placed side by side in the lateral width direction of the planting machine body 220A on the seedling placing table 223 for storage. Seedling longitudinal conveyor belts 224 are respectively provided in the eight seedling placement parts 223a.

[0259] If the transplanting device 220 descends to the lowering operation state and is operated to the driving state, power is transmitted from the engine 204 to the supply tank 225 (refer to Figure 13 ) supported at the front part of the planting machine body 220A, and is respectively input from the supply tank 225 to the four planting drive boxes 221. The eight transplanting mechanisms 222 are respectively driven by the power of the planting drive boxes 221 to perform a rotational movement for transplanting between the lower end side of the seedling placing table 223 and the paddy field surface. If the transplanting mechanism 222 performs a rotational movement, the planting claws 222c of the pair of planting arms 222b alternately rotate and move up and down between the seedling taking-out port and the paddy field surface. The planting claws 222c of each of the pair of planting arms 222b take out the planting seedlings from the seedlings on the seedling placing table 223 at the seedling taking-out port, and lower and convey the taken-out planting seedlings to plant them on the paddy field surface. The seedling taking-out port is formed on the lower end side of the seedling placing table 223 by using a guide rail 226.

[0260] A seedling lateral conveying mechanism (not shown) provided across the seedling placing table 223 and the supply tank 225 drives the seedling lateral conveying mechanism in conjunction with the rotational movement of the supply tank 225 and the transplanting mechanism 222, and reciprocally moves the seedling placing table 223 in the lateral width direction of the planting machine body 220A in conjunction with the rotational movement of the seedling lateral conveying mechanism and the transplanting mechanism 222. Thus, the seedlings respectively placed in the eight seedling placement parts 223a are reciprocally moved in the lateral direction relative to the transplanting mechanism 222, and the eight transplanting mechanisms 222 respectively take out the planting seedlings in sequence from one end side to the other end side in the lateral width direction of the seedlings placed in the seedling placement parts 223a.

[0261] If the seedling planting table 223 reaches the end of the lateral transfer stroke to the left or right, the power of the supply box 225 is used to drive the seedling longitudinal conveying mechanism (not shown) provided across the seedling planting table 223 and the supply box 225, and the seedling longitudinal conveyor belts 224 of the eight seedling placement parts 223a are driven by the seedling longitudinal conveying mechanism (not shown). That is, every time the seedling planting table 223 reaches the end of the lateral transfer stroke to the left or right, the seedlings placed on the eight seedling placement parts 223a are longitudinally conveyed to the transplanting mechanism 222 by the seedling longitudinal conveyor belts 224 by an amount corresponding to the length in the longitudinal direction of the planting seedlings taken out by the transplanting mechanism 222.

[0262] In the transplanting device 220, the machine body 201 travels in a state of being lowered to the lowering operation state, so that the power transmitted from the engine 204 to the supply box 225 is used to drive the eight transplanting mechanisms 222, the seedling planting table 223, and the seedling longitudinal conveyor belts 224, and the eight transplanting mechanisms 222 perform transplanting in an eight-row planting method. The transplanting of one row amount performed by each of the eight transplanting mechanisms 222 is carried out by the alternate transplanting of a pair of planting claws 222c with a plant spacing Da (refer to Figure 18 ). The plant spacing Da is the planting interval in the traveling direction of the machine body 201.

[0263] 〔Regarding the structure of power transmission〕

[0264] As Figure 13 shown, a transmission 230 is provided behind the engine 204. The transmission 230 forms the front part of the machine body 201. As Figure 15 shown, the front-wheel drive box part 231, which is the driving box part of the traveling device, extends from the two lateral parts at the lower part of the transmission 230 to the outside of the machine body in the lateral direction. The transmission 230 rotatably supports the left and right front wheels 202 by means of the left and right front-wheel drive box parts 231.

[0265] As Figure 15 、 Figure 16 shown, a hydrostatic first continuously variable transmission 232, which is a speed change device for traveling and working, is supported on the transmission 230. The first continuously variable transmission 232 is supported on the part at the upper left outside in the lateral direction in the transmission 230. As Figure 13 shown, the output shaft of the engine 204 and the input shaft 232a (refer to Figure 15 ) of the first continuously variable transmission 232 are linked together by a power transmission belt 233. The power of the engine 204 is input to the first continuously variable transmission 232 by the power transmission belt 233. The input shaft 232a of the first continuously variable transmission 232 is the pump shaft provided in the hydraulic pump constituting the first continuously variable transmission 232.

[0266] In the first continuously variable transmission device 232, by rotating the speed change operation shaft 232b (refer to Figure 15 ) that is rotatably supported by the housing, the swash plate angle of a hydraulic pump (not shown) is changed to shift to a neutral speed change state, a forward speed change state, and a reverse speed change state. If the first continuously variable transmission device 232 shifts to the neutral speed change state, the output shaft 232c (refer to Figure 15 ) of the first continuously variable transmission device 232 stops. The output shaft 232c of the first continuously variable transmission device 232 is the motor shaft provided in the hydraulic motor that constitutes the first continuously variable transmission device 232. If the first continuously variable transmission device 232 shifts to the forward speed change state, the power from the engine 204 is converted into forward power by the hydraulic pump and the hydraulic motor, and becomes variable speed power with continuously variable rotational speed and is output from the output shaft 232c. If the first continuously variable transmission device 232 shifts to the reverse speed change state, the power from the engine 204 is converted into reverse power by the hydraulic pump and the hydraulic motor, and becomes variable speed power with continuously variable rotational speed and is output from the output shaft 232c.

[0267] As Figure 16 shown, a hydrostatic second continuously variable transmission device 235 as a continuously variable transmission device for work is supported on the transmission 230. The second continuously variable transmission device 235 is supported on the upper portion of the transmission 230 on the right outer side in the lateral direction. A cooling fan 236 is supported in a non-rotatable relative manner on a portion of the input shaft 235a of the second continuously variable transmission device 235 that protrudes outside the housing. The input shaft 235a of the second continuously variable transmission device 235 is the pump shaft provided in the hydraulic pump that constitutes the second continuously variable transmission device 235.

[0268] As Figure 15 、 Figure 16 shown, a branch shaft 237 as a branch portion, an auxiliary speed change device 240 for traveling, a front wheel differential mechanism 250, a reduction mechanism 260 for work, and a work unit speed change device 270 are provided inside the transmission 230. As Figure 15 shown, a rear wheel output shaft 280 is rotatably supported on a first output boss portion 230c formed at the rear of the transmission 230. As Figure 16 shown, a work output shaft 289 is rotatably supported on a second output boss portion 230d formed at the rear of the transmission 230. A work unit clutch 290 is provided on a portion of the work output shaft 289 that is inside the second output boss portion 230d.

[0269] As Figure 18As shown, a power transmission device Sb for traveling and working is constituted by a branch shaft 237, a sub-speed change device 240, a second continuously variable transmission device 235, a speed reduction mechanism 260, a working unit speed change device 270, a working unit clutch 290, etc. A traveling power transmission system Xa in the power transmission device S is constituted by the sub-speed change device 240, etc. A working power transmission system Ya in the power transmission device Sb is constituted by the second continuously variable transmission device 235, the speed reduction mechanism 260, the working unit speed change device 270, the working unit clutch 290, etc.

[0270] In the power transmission device Sb, the speed-changed power after being speed-changed by the first continuously variable transmission device 232 is input from the output shaft 232c to the branch shaft 237, and is branched into traveling power and working power by the branch shaft 237. The branched traveling power is output to the front wheels 202 and the rear wheels 203 by the traveling power transmission system Xa. Specifically, the branched traveling power is input to the traveling sub-speed change device 240 and is output from the sub-speed change device 240 to the front wheels 202 and the rear wheels 203. The branched working power is output to the planting mechanism 222 of the planting device 220, etc. by the working power transmission system Ya. Specifically, the branched working power is first input to the second continuously variable transmission device 235, then input from the second continuously variable transmission device 235 to the speed reduction mechanism 260, then input from the speed reduction mechanism 260 to the working unit speed change device 270, then input from the working unit speed change device 270 to the working unit clutch 290, and is output from the working unit clutch 290 to the planting mechanism 222 of the planting device 220, etc. That is, the second continuously variable transmission device 235, the speed reduction mechanism 260, the working unit speed change device 270, and the working unit clutch 290 provided in the working power transmission system Ya are set in a state where the order is the same as the order in which the second continuously variable transmission device 235, the speed reduction mechanism 260, the working unit speed change device 270, and the working unit clutch 290 output to the planting mechanism 222 of the planting device 220, etc.

[0271] 〔Regarding the structure of the branch shaft 237〕

[0272] Specifically, as Figure 15 、 Figure 16As shown, the branch shaft 237 is rotatably supported by the left and right transverse wall portions of the transmission 230. The end portion of the branch shaft 237 on the left transverse wall portion side is connected to the output shaft 232c of the first continuously variable transmission 232 in a non-rotatable relative manner by spline engagement. The end portion of the branch shaft 237 on the right transverse wall portion side is connected to the input shaft 235a of the second continuously variable transmission 235 in a non-rotatable relative manner by a connecting member 238. At the middle portion of the branch shaft 237, two input gears 241, 242 of the auxiliary transmission 240 for traveling are provided in a non-rotatable relative manner. The speed-changing power output by the first continuously variable transmission 232 is branched by the branch shaft 237 into traveling power and working power. The branched traveling power is input into the auxiliary transmission 240 for traveling, and the branched working power is input into the second continuously variable transmission 235.

[0273] 〔For the auxiliary transmission 240 for traveling〕

[0274] As Figure 15 shown, the auxiliary transmission 240 for traveling, in addition to having two input gears 241, 242 provided on the branch shaft 237 in a non-rotatable relative manner, further has an output shaft 243 parallel to the branch shaft 237 and a shift gear 244 supported on the spline portion of the output shaft 243 in a slidable and non-rotatable relative manner.

[0275] In the auxiliary transmission 240 for traveling, by sliding the shift gear 244, the gear portion 244a on the large-diameter side of the shift gear 244 is engaged with the input gear 241 on the small-diameter side to change to the low-speed side speed-changing state, and the gear portion 244b on the small-diameter side of the shift gear 244 is engaged with the input gear 242 on the large-diameter side to change to the high-speed side speed-changing state. In the auxiliary transmission 240 for traveling, when shifting to the speed-changing state on either the low-speed side or the high-speed side, the traveling power branched by the branch shaft 237 is transmitted to the output shaft 243 by the shift gear 244, and is transmitted from the output shaft 243 to the input shaft 251 of the front-wheel differential mechanism 250 via the gear linkage mechanism 245.

[0276] 〔For the structure of the front-wheel differential mechanism 250〕

[0277] In the front-wheel differential mechanism 250, as Figure 15 shown, the traveling power transmitted to the input shaft 251 is transmitted to the gearbox 252 that cannot rotate relative to the input shaft 251, and is transmitted from the gearbox 252 to the left and right front-wheel drive shafts 254 via the differential gear mechanism portion 253.

[0278] 〔For the structure of the rear-wheel output shaft 280〕

[0279] AsFigure 15 As shown, the output shaft 280 for the rear wheels has an input gear 282 formed at the end within the transmission in the output shaft 280 for the rear wheels in a non-rotatable relative manner. A power transmission gear 255 is provided on the input shaft 251 of the front-wheel differential mechanism 250 in a non-rotatable relative manner, and the input gear 282 meshes with the power transmission gear 255.

[0280] In the output shaft 280 for the rear wheels, the driving power transmitted from the sub-transmission device 240 for driving to the input shaft 251 of the front-wheel differential mechanism 250 is input by means of the power transmission gear 255 and the input gear 282, and the input driving power is output from the end on the side opposite to the input side of the output shaft 280 for the rear wheels. The driving power output from the output shaft 280 for the rear wheels is transmitted to the rear-wheel drive case 283 by a rotating shaft 284 extending from the output shaft 280 for the rear wheels to the rear-wheel drive case 283 as shown. Figure 13 As shown, it is transmitted to the rear-wheel drive case 283 by a rotating shaft 284 extending from the output shaft 280 for the rear wheels to the rear-wheel drive case 283.

[0281] A multi-disc friction brake 285 is mounted on the output shaft 280 for the rear wheels. In the friction brake 285, by rotating the operating shaft 286 rotatably supported by the first output boss portion 230c by means of the operating arm 287, it is switched to the engaged state where the friction plate is pressed by the pressing member 288 and the separated state where the pressing of the friction plate by the pressing member 288 is released.

[0282] 〔Regarding the structure of the second continuously variable transmission 235〕

[0283] As shown in Figure 16 、 Figure 17 shown, the second continuously variable transmission 235 has a transmission operation shaft 235b rotatably supported by the housing. As shown in Figure 21 shown, the second continuously variable transmission 235 has a transmission limiting portion 322. The rotation operation of the transmission operation shaft 235b is restricted by the transmission limiting portion 322 in such a manner that the swash plate angle of the hydraulic pump cannot be changed to the swash plate angle for neutral, forward rotation, or reverse rotation by the rotation operation of the transmission operation shaft 235b.

[0284] In the second continuously variable transmission 235, if the transmission is in the neutral transmission state, the output shaft 239 of the second continuously variable transmission 235 stops. If the transmission is in the forward rotation side transmission state, the working power input to the input shaft 235a from the branch shaft 237 is converted into forward rotation power by the hydraulic pump and the hydraulic motor, and becomes a continuously variable speed transmission power and is output from the output shaft 239.

[0285] 〔Regarding the reduction mechanism 260 for work〕

[0286] As shown in Figure 16 、Figure 17 As shown, a speed reduction mechanism 260 for work is disposed across the output shaft 239 of the second continuously variable transmission 235 and a transmission cylinder shaft 261 that is externally fitted to the output shaft 239 so as to be relatively rotatable. Specifically, as Figure 15 shown, the output shaft 239 of the second continuously variable transmission 235 includes an output shaft main body 239A and an extended output shaft 239B. The speed reduction mechanism 260 for work is disposed across the extended output shaft 239B in the output shaft 239 and the end portion on the side of the second continuously variable transmission of the transmission cylinder shaft 261.

[0287] Specifically, as Figure 17 shown, the speed reduction mechanism 260 includes: an input gear 262 that is disposed on the output shaft 239 so as not to be relatively rotatable; a first intermediate gear 263 that is supported on the output shaft 271 of the work unit transmission 270 so as to be relatively rotatable; a second intermediate gear 264 that is disposed on the boss portion of the first intermediate gear 263 so as not to be relatively rotatable; and an output gear 265 that is disposed on the transmission cylinder shaft 261 so as not to be relatively rotatable in a state of meshing with the second intermediate gear 264. The input gear 262 is disposed on the extended output shaft 239B in the output shaft 271. The output gear 265 is disposed on the end side portion on the side of the second continuously variable transmission in the transmission cylinder shaft 261.

[0288] In the speed reduction mechanism 260 for work, the speed-varied power output from the second continuously variable transmission 235 is reduced between the input gear 262 and the first intermediate gear 263, further reduced between the second intermediate gear 264 and the output gear 265, and transmitted from the output gear 265 to the transmission cylinder shaft 261.

[0289] 〔Regarding the structure of the work unit transmission 270〕

[0290] As Figure 16 、 Figure 17 shown, the work unit transmission 270 includes input side gears 272 as four input side members that are disposed on the transmission cylinder shaft 261 so as not to be relatively rotatable and four output side gears 273 that are disposed on the output shaft 271 so as to be relatively rotatable. The input side gears 272 are disposed on the end side portion of the transmission cylinder shaft 261 opposite to the end side where the speed reduction mechanism 260 is disposed. As Figure 19 shown, the four input side gears 272 are juxtaposed in a state of being spaced apart by a gasket 298.

[0291] The first input-side gear 272a among the four input-side gears 272 meshes with the first output-side gear 273a among the four output-side gears 273, the second input-side gear 272b among the four input-side gears 272 meshes with the second output-side gear 273b among the four output-side gears 273, the third input-side gear 272c among the four input-side gears 272 meshes with the third output-side gear 273c among the four output-side gears 273, and the fourth input-side gear 272d among the four input-side gears 272 meshes with the fourth output-side gear 273d among the four output-side gears 273.

[0292] The first input-side gear 272a and the first output-side gear 273a are formed of circular gears with the same outer diameter. The second input-side gear 272b, the third input-side gear 272c, the fourth input-side gear 272d, the second output-side gear 273b, the third output-side gear 273c, and the fourth output-side gear 273d are formed of elliptical gears, eccentric gears, or non-circular gears.

[0293] As Figure 17 , Figure 19 shown, the working unit speed change device 270 includes a key groove 274 formed in the output shaft 271, a speed change key 275 slidably received in the key groove 274, and a speed change operation shaft 276 slidably supported by the boss portion 230e of the transmission case 230 and the output shaft 271. The end portion of the speed change operation shaft 276 on the output shaft side is engaged with the end portion of the speed change key 275 in a manner that allows pushing and pulling operations.

[0294] In the working unit speed change device 270, the speed change key 275 is moved in the key groove 274 by the sliding operation of the speed change operation shaft 276, so that the key projection portion 277 of the speed change key 275 faces one of the four output-side gears 273, and the key projection portion 277 is engaged with the engagement groove 278 of the output-side gear 273, thereby changing to four speed change states. When the key projection portion 277 is engaged with the engagement groove 278 of each of the four output-side gears 273, the positioning sphere 296 is pressed against the speed change key 275 by the positioning spring 297, and the speed change key 275 is positioned at each speed change position by the positioning sphere 296. The key projection portion 277 is manufactured by precision blanking or sintering. As Figure 19 shown, the lower pendulum portion 277a of the key projection portion 277 is formed in a cliff shape so as not to enter the engagement groove 278 of the output-side gear 273 adjacent to the output-side gear 273 into which the key projection portion 277 is engaged.

[0295] That is, in the operation unit speed change device 270, if the key projection 277 engages with the engagement groove 278 of the first output side gear 273a, the speed is changed to the first speed change state. In the case of the speed being changed to the first speed change state, the first output side gear 273a and the output shaft 271 are connected by the key projection 277 in a non-rotatable relative manner, and the working power transmitted to the transmission cylinder shaft 261 by the speed reduction mechanism 260 is transmitted to the output shaft 271 via the first input side gear 272a, the first output side gear 273a, and the key projection 277. The angular velocity of one rotation of the output shaft 271 does not change, and the working power of constant speed rotation with an equal rotation speed for one rotation is output from the output gear 279 of the output shaft 271.

[0296] In the operation unit speed change device 270, if the key projection 277 engages with the engagement groove 278 of the second output side gear 273b, the speed is changed to the second speed change state; if the key projection 277 engages with the engagement groove 278 of the third output side gear 273c, the speed is changed to the third speed change state; if the key projection 277 engages with the engagement groove 278 of the fourth output side gear 273d, the speed is changed to the fourth speed change state. In the case of any one of the second speed change state, the third speed change state, and the fourth speed change state, the output side gears 273b, 273c, 273d corresponding to the speed change state and the output shaft 271 are connected by the key projection 277 in a non-rotatable relative manner, and the working power transmitted to the transmission cylinder shaft 261 by the speed reduction mechanism 260 is transmitted to the output shaft 271 via the input side gears 272a, 272c, 272d corresponding to the speed change state, the output side gears 273b, 273c, 273d, and the key projection 277. The angular velocity of one rotation of the output shaft 271 changes between high and low, and the working power of non-constant speed rotation with a fast or slow rotation speed for one rotation is output from the output gear 279. In the case of the second speed change state, the third speed change state, and the fourth speed change state, the positions of the parts that become rapid during one rotation are different, or even if the parts that become rapid are the same, the speeds at the rapid parts are different.

[0297] 〔Regarding the structure of the operation unit clutch 290〕

[0298] As Figure 17As shown, the working unit clutch 290 is disposed at a position downstream of the working unit speed change device 270 in the transmission direction. Specifically, the working unit clutch 290 is disposed between the output gear 279 of the working unit speed change device 270 and the working output shaft 289. The isochronous rotation and non-isochronous rotation working power output from the working unit speed change device 270 is input to the input side clutch member 291 of the working unit clutch 290 in the original rotation state, and is transmitted from the output side clutch member 292 of the working unit clutch 290 to the working output shaft 289.

[0299] In the working unit clutch 290, the operation shaft 293 that can be slidably supported on the second output boss portion 230d by pressing operation toward the inside of the second output boss portion 230d, so that the front end portion 293a of the operation shaft 293 touches the stop cam portion 292a at the fixed position of the output side clutch member 292, and the output side clutch member 292 is operated against the spring 294 to be separated from the input side clutch member 291 to be in a separated state, and the power transmission to the transplanter 220 is cut off by the working unit clutch 290. By pulling the operation shaft 293 outward of the second output boss portion 230d, the front end portion 293a of the operation shaft 293 is separated from the output side clutch member 292, and the output side clutch member 292 is operated by the spring 294 to engage with the input side clutch member 291 to be in an engaged state, and the power transmission to the transplanter 220 is turned on by the working unit clutch 290.

[0300] 〔Structure of the working output shaft 289〕

[0301] The working output shaft 289 is linked to the input shaft of the supply box 225 via the rotating shaft 281 (refer to Figure 1 ). The isochronous rotation and non-isochronous rotation working power transmitted from the working unit clutch 290 to the working output shaft 289 is transmitted to the supply box 225 via the rotating shaft 281 in the original rotation state. The isochronous rotation and non-isochronous rotation working power transmitted to the supply box 225 is transmitted to the eight transplanting mechanisms 222 via the planting drive box 221 in the original rotation state.

[0302] When performing non-planting operations such as moving and driving, the vehicle travels in a speed-changing state where the auxiliary speed-changing device 240 for driving is in the high-speed side. When performing planting operations, the vehicle travels in a speed-changing state where the auxiliary speed-changing device 240 for driving is in the low-speed side. During planting operations, by performing a speed-changing operation on the first continuously variable transmission device 232, the power of the engine 204 is speed-changed and transmitted by the first continuously variable transmission device 232 to the front wheels 202 and the rear wheels 203, and the traveling speed of the machine body 201 can be changed. Even if the traveling speed of the machine body 201 is changed, the speed-changed power of the first continuously variable transmission device 232 is transmitted to the transplanting mechanism 222, and the rotational speed of one rotation of the transplanting mechanism 222 changes in conjunction with the change in the traveling speed of the machine body 201. Regardless of how the traveling speed of the machine body 201 is changed, transplanting is performed using the transplanting mechanism 222 with the plant spacing Da1 of the width set according to the speed-changing state of the second continuously variable transmission device 235 after a pre-speed-changing operation.

[0303] By performing a speed-changing operation on the second continuously variable transmission device 235, the working power from the branch shaft 237 is speed-changed and transmitted by the second continuously variable transmission device 235 to the transplanting mechanism 222, and the rotational speed of one rotation of the transplanting mechanism 222 changes independently of the traveling speed of the machine body 201. Thereby, transplanting is performed using the transplanting mechanism 222 with the plant spacing Da2. The plant spacing Da2 is the width set according to the speed-changing state of the second continuously variable transmission device 235 after the speed-changing operation, and is a plant spacing with a width different from the plant spacing Da1 of the width before the speed-changing operation on the second continuously variable transmission device 135.

[0304] When changing the plant spacing Da to a plant spacing that is not too wide and not too narrow, the working part speed-changing device 270 is speed-changed to the first speed-changing state. Then, the working power with a constant rotational speed set by the working part speed-changing device 270 is transmitted to the transplanting mechanism 222, that is, the rotational speed of one rotation of the transplanting mechanism 222 is set to a constant rotational speed according to the first speed-changing state of the working part speed-changing device 270, and the transplanting mechanism 222 performs transplanting while rotating at a rotational speed with an equal rotational speed of one rotation.

[0305] When changing the plant spacing Da to a wider or narrower plant spacing, the working part speed change device 270 is shifted to the second speed change state, the third speed change state, or the fourth speed change state corresponding to the width of the changed plant spacing Da. In this way, the variable-speed rotational working power set according to the speed change state of the working part speed change device 270 is transmitted to the transplanting mechanism 222. That is, the rotational speed of one revolution of the transplanting mechanism 222 is made to have a speed corresponding to the width of the plant spacing Da by using the working part speed change device 270. When the planting claws 222c move downward to insert into the paddy field surface, the moving speed becomes higher than the moving speed when the planting claws 222c are located at a position above the paddy field surface, or when the moving speed of the planting claws 222c during insertion becomes lower than the moving speed when the planting claws 222c are located at a position above the paddy field surface, the transplanting mechanism 222 performs transplanting. Regardless of the width or narrowness of the plant spacing Da, transplanting is performed in a state where the paddy field surface is not disturbed by the planting claws 222c or the planting seedlings are not pulled out from the paddy field surface by the planting claws 222c.

[0306] By switching the operation of the working part clutch 290 to the disengaged state, the power transmission to the transplanting device 220 is cut off by the working part clutch 290, and the transplanting mechanism 222 stops. At this time, due to the action of the fixed position stop cam portion 292a, the transplanting mechanism 222 stops at the rotational position where the pair of planting claws 222c are respectively located at positions above the paddy field surface.

[0307] As Figure 15 、 Figure 16 shown, the transmission 230 includes a case main body 230A and a case cover portion 230B that closes the lateral opening of the case main body 230A. The case cover portion 230B is connected to the end portion of the case main body 130A having the lateral opening by connecting bolts (not shown). The transmission 230 can be divided into the case main body 230A and the case cover portion 230B.

[0308] As Figure 15 、 Figure 16 shown, the first continuously variable transmission 232 is supported outside the case main body 230A. As Figure 16 shown, the second continuously variable transmission 235 is supported outside the case cover portion 230B. As Figure 15 、 Figure 16 shown, the working part speed change device 270 and the auxiliary speed change device 240 for traveling are provided inside the case main body 230A. As Figure 16 shown, the reduction mechanism 260 is provided inside the case cover portion 230B.

[0309] As Figure 15As shown, the output shaft main body 239A of the output shaft 239 of the second continuously variable transmission 235 is inserted into the inside of the cover portion 230B from the outside of the cover portion 230B. The extended output shaft 239B of the output shaft 239 is connected to the portion of the output shaft main body 239A located inside the transmission in a separable and non-rotatable relative manner. Since the reduction mechanism 260 and the transmission cylinder shaft 261 are provided on the extended output shaft 239B, by separating the extended output shaft 239B from the output shaft main body 239A, the reduction mechanism 260 and the input side gear 272 of the working unit transmission 270 are separated from the second continuously variable transmission 235 together with the extended output shaft 239B.

[0310] [Structure for supplying oil to the first continuously variable transmission 232 and the second continuously variable transmission 235]

[0311] As Figure 20 shown, an oil supply circuit 304 is connected to the two oil replenishing ports 303 of the transmission 230 and the first continuously variable transmission 232. The lubricating oil stored in the transmission 230 is supplied to the first continuously variable transmission 232 as working oil through the oil supply circuit 304.

[0312] Specifically, the oil supply circuit 304 includes: a suction oil passage 304a, one end side of which is connected to the transmission 230; a hydraulic pump 305, the suction portion of which is connected to the other end side of the suction oil passage 304a; a first oil supply path 304b, which extends from the discharge portion of the hydraulic pump 305; a second oil supply path 304c, one end side of which is connected to the extended end portion of the first oil supply path 304b via the torque generator 300; a third oil supply path 304d, one end side of which is connected to the other end side of the second oil supply path 304c via the control valve circuit 306 of the lifting cylinder 301. A branched oil passage portion 304e divided into two is provided at the other end side of the third oil supply path 304d. One of the two branched oil passage portions 304e is connected to one of the two oil replenishing ports 303 of the first continuously variable transmission 232, and the other of the two branched oil passage portions 304e is connected to the other of the two oil replenishing ports 303 of the first continuously variable transmission 232. As Figure 15 、 Figure 16 shown, the hydraulic pump 305 is supported on the right outer lateral portion of the upper part of the transmission 230. The drive shaft 305a of the hydraulic pump 305 is connected to the input shaft 232a of the first continuously variable transmission 232 in a linked manner through a rotating shaft 307. The hydraulic pump 305 is driven by the input shaft 232a of the first continuously variable transmission 232.

[0313] In the oil supply circuit 304, as Figure 20As shown, the lubricating oil of the transmission 230 is taken out by the hydraulic pump 305. The taken-out lubricating oil is supplied by the hydraulic pump 305 to the torque generator 300 via the first oil supply path 304b, supplied from the torque generator 300 to the third oil supply path 304d via the second oil supply path 304c and the control valve circuit 306, and supplied as working oil to the first continuously variable transmission 232 from the two branch oil path parts 304e of the third oil supply path 304d.

[0314] As Figure 20 shown, the oil discharge path 308 of the lift cylinder 301 is connected to a portion of the third oil supply path 304d that is more upstream than the two branch oil path parts 304e. The discharged oil of the lift cylinder 301 is supplied as working oil to the first continuously variable transmission 232 via the third oil supply path 304d.

[0315] As Figure 20 shown, an oil replenishing circuit 311 is connected between the oil discharge port 309 of the first continuously variable transmission 232 and the oil replenishing port 310 of the second continuously variable transmission 235. The front wheels 202 and the rear wheels 203 are the first drive target devices that are the output targets of the first continuously variable transmission 232, and the transplanting device 220 is the second drive target device that is the output target of the second continuously variable transmission 235. Since the driving load applied to the first continuously variable transmission 232 is greater than the driving load applied to the second continuously variable transmission 235, the set oil replenishing pressure of the first continuously variable transmission 232 is set to be higher than the set oil replenishing pressure of the second continuously variable transmission 235. The discharged oil discharged from the first continuously variable transmission 232 is replenished to the second continuously variable transmission 235 using the oil replenishing circuit 311 with the discharge pressure of the first continuously variable transmission 232 as the conveying force.

[0316] As Figure 21As shown, the oil replenishment circuit 311 penetrates the wall of the transmission 230. Specifically, the oil replenishment circuit 311 penetrates the upper wall portion 302 and the transverse wall portion 313. The upper wall portion 302 is the part of the wall of the transmission 230 located in the upper part of the transmission 230, and the transverse wall portion 313 is located on the lateral side portion of the transmission 230 in the wall of the transmission 230. The upper wall portion 302 straddles the case main body 230A and the case cover portion 230B. The transverse wall portion 313 is the transverse wall portion of the case cover portion 230B. A torque generator support portion 314 for supporting the torque generator 300 is formed in the upper side portion of the front portion of the transmission 230. The oil replenishment circuit 311 includes a first lateral circuit portion 311a, a front-rear direction circuit portion 311b, a vertical direction circuit portion 311c, and a second lateral circuit portion 311d. The first lateral circuit portion 311a passes through the inside of the portion of the upper wall portion 302 that is more rearward than the torque generator support portion 314 in the lateral width direction of the machine body 201. The front-rear direction circuit portion 311b passes through the inside of the transverse end side portion on the first continuously variable transmission side in the upper wall portion 302 in the front-rear direction of the machine body 201. The vertical direction circuit portion 311c passes through the inside of the transverse wall portion 313 in the case cover portion 230B in the vertical direction of the machine body 201. The second lateral circuit portion 311d extends along the boss portion 315 that protrudes laterally from the transverse wall portion 313 in the case cover portion 230B. The front-rear direction circuit portion 311b connects the first lateral circuit portion 311a to the oil drain port 309 of the first continuously variable transmission 232. The vertical direction circuit portion 311c connects the first lateral circuit portion 311a to the second lateral circuit portion 311d. The second lateral circuit portion 311d is connected to the oil replenishment port 310 of the second continuously variable transmission 235.

[0317] As Figure 20 shown, an oil drain circuit 317 is provided to communicate the oil drain port 316 of the second continuously variable transmission 235 with the transmission 230. The drained oil discharged from the second continuously variable transmission 235 returns to the transmission 230 by means of the oil drain circuit 317.

[0318] Specifically, as Figure 21 、 Figure 22 、 Figure 23 shown, the oil drain circuit 317 is composed of a groove 318 and a cover member 319. The groove 318 is formed as the second wall portion of the transmission 230 on the inner surface of the transverse wall portion 313, and the cover member 319 closes the opening of the groove 318. The cover member 319 is mounted on the inner surface of the transverse wall portion 313 by means of connecting screws 320. As Figure 23 shown, the upper end portion of the groove 318 communicates with the oil drain port 316 of the second continuously variable transmission 235. As Figure 23 shown, the lower end portion of the groove 318 communicates with the through hole 321 of the transverse wall portion 313 and communicates with the inside of the front-wheel drive case portion 231 via the through hole 321.

[0319] The oil discharged from the second continuously variable transmission 235 is discharged by the oil discharge circuit 317 into the interior of the front-wheel drive case portion 231, cooled while passing through the interior of the front-wheel drive case portion 231, and then returned to the interior of the transmission 230.

[0320] (Other embodiments related to the third embodiment)

[0321] (1) In the above-described third embodiment, an example is shown in which the first continuously variable transmission 232 and the second continuously variable transmission 235 are supported on the upper part of the transmission 230. However, it is not limited thereto, and the first continuously variable transmission 232 and the second continuously variable transmission 235 may be supported at any part such as the lower part of the transmission 230 and implemented. Depending on the part where the first continuously variable transmission 232 and the second continuously variable transmission 235 are supported, the oil replenishing circuit 311 may be formed not only through the upper wall portion 302 of the transmission 230 but also through the wall portions of any part such as the transverse wall portion and the bottom wall portion of the transmission 230.

[0322] (2) In the above-described third embodiment, an example is shown in which the oil discharge circuit 317 is constituted by the groove 318 formed in the transverse wall portion 313 as the second wall portion. However, it is not limited thereto, and a groove formed in the wall portion of any part such as the rear wall portion and the front wall portion may also be used.

[0323] (3) In the above-described third embodiment, an example of the working part speed change device 270 having a structure in which the speed change key 275 acts on the output side gear 273 is shown. However, a working part speed change device having a structure in which the speed change key 275 acts on the input side gear 272 may also be used.

[0324] (4) In the above-described third embodiment, an example is shown in which the output shaft 239 of the continuously variable transmission 235 for work includes the output shaft main body 239A and the extended output shaft 239B. However, it is not limited thereto, and the output shaft 239 may also be implemented as a single output shaft.

[0325] (5) In the above-described third embodiment, an example is described in which the transplanting device 220 for supplying seedlings as agricultural materials to the paddy field surface is provided. However, it is not limited thereto. A working device for supplying rice seeds, liquid or powder-like chemicals, and liquid or powder-like fertilizers as agricultural materials to the paddy field surface may also be provided.

[0326] (6) In the above-described third embodiment, an example is shown in which the engine 204 is provided as the prime mover. However, it is not limited thereto, and an electric motor may also be used as the prime mover. In addition, a prime mover combining an engine and an electric motor may also be used.

[0327] (7) In the above-described third embodiment, an example in which the front wheels 202 and the rear wheels 203 are used as the traveling device is shown, but it is not limited thereto, and a crawler traveling device can be used as the traveling device. In addition, a traveling device combining wheels and a small crawler can be used.

[0328] Note that the present invention is not limited to the above-described embodiments and the above-described other embodiments, and various other changes can be made.

[0329] The present invention can be used not only for riding-type rice transplanters but also for seeders.

[0330] The present invention can be used not only for riding-type rice transplanters but also for work machines such as riding-type spreaders that supply agricultural materials such as seeds, fertilizers, or chemicals to the paddy field surface.

Claims

1. An operating machine, characterized in that, Comprising: An operation unit that rotates up and down between an agricultural material supply unit and the ground surface while supplying agricultural materials to the ground surface; A power transmission device having an operation power transmission system that outputs the driving force from a prime mover to the operation unit; A speed change device that is input with the power of a prime mover, changes the speed of the input power, and outputs the changed-speed power; The operation power transmission system includes a hydrostatic continuously variable transmission and a reduction mechanism provided on the downstream side in the transmission direction relative to the hydrostatic continuously variable transmission; The power transmission device has a branch portion that branches the changed-speed power output from the speed change device into traveling power and operation power, a traveling power transmission system that outputs the traveling power from the branch portion to a traveling device, and an operation power transmission system; The operation power transmission system outputs the operation power from the branch portion to the operation unit; The operation power transmission system further includes an operation unit speed change device that is provided on the downstream side in the transmission direction relative to the reduction mechanism and makes the rotational speed of one rotation of the operation unit fast and slow.

2. The working machine according to claim 1, characterized in that: In the continuously variable transmission, a transmission cylinder shaft is provided, and the transmission cylinder shaft is externally fitted to the output shaft of the continuously variable transmission in a relatively rotatable manner; The reduction mechanism is provided across the output shaft and the transmission cylinder shaft; The input side member of the operation unit speed change device is provided on the transmission cylinder shaft.

3. The working machine according to claim 1 or 2, characterized in that: The working machine is provided with a gearbox that houses the operation unit speed change device and the reduction mechanism; The gearbox is configured to be separable into a box main body in which the operation unit speed change device is provided and a box cover portion in which the reduction mechanism is provided.

4. The working machine according to claim 3, characterized in that: The continuously variable transmission is supported outside the box cover portion; The output shaft of the continuously variable transmission includes: an output shaft main body that is inserted from the outside of the box cover portion into the inside of the box cover portion; and an extended output shaft that is detachably and non-rotatably connected to a portion of the output shaft main body located inside the gearbox; The reduction mechanism and a transmission cylinder shaft that is externally fitted to the output shaft in a relatively rotatable manner are provided on the extended output shaft.

5. The working machine according to claim 1 or 2, characterized in that: The working machine is provided with an operation unit clutch that is provided on the downstream side in the transmission direction relative to the operation unit speed change device and makes the power transmission to the operation unit on and off.

6. The working machine according to claim 1 or 2, characterized in that: The agricultural material supply unit is a seedling tray that stores seedlings as agricultural materials; The operation unit is a transplanting mechanism that takes out seedlings from the seedling tray and supplies the taken-out seedlings to the ground surface.

7. An operating machine, characterized in that, Comprising: A hydrostatic first continuously variable transmission that outputs to a first driven object device and a hydrostatic second continuously variable transmission that outputs to a second driven object device; A transmission case that supports the first continuously variable transmission device and the second continuously variable transmission device The work machine is provided with an oil replenishment circuit that is connected to the oil discharge port of the first continuously variable transmission device and the oil replenishment port of the second continuously variable transmission device, and uses the discharge pressure of the first continuously variable transmission device to supply the discharged oil discharged from the first continuously variable transmission device as working oil to the second continuously variable transmission device The oil replenishment circuit penetrates through the wall portion of the transmission case The first continuously variable transmission device and the second continuously variable transmission device are supported on the upper portion of the transmission case The oil replenishment circuit passes through the portion of the wall portion that is located in the upper portion of the transmission case 8. The work machine according to claim 7, characterized in that The work machine includes: a traveling device drive box portion that extends from the transmission case; an oil supply circuit that takes out lubricating oil from the transmission case and supplies the taken-out lubricating oil as working oil to the first continuously variable transmission device; an oil discharge circuit that discharges the discharged oil of the second continuously variable transmission device to the traveling device drive box portion 9. The working machine according to claim 8, characterized in that, The oil discharge circuit is composed of a groove formed on the inner surface of the second wall portion of the transmission case and a cover member that is installed on the inner surface and closes the opening of the groove 10. The work machine according to claim 7, characterized in that The first driven object device is a traveling device The second driven object device is a work device that supplies agricultural materials to the field 11. The work machine according to claim 10, characterized in that The variable-speed power output by the first continuously variable transmission device is branched into traveling power and work power. The branched traveling power is transmitted to the traveling device, and the branched work power is transmitted to the work device via the second continuously variable transmission device 12. The working machine according to claim 11, characterized in that, The work device is a rice transplanter that supplies seedlings as agricultural materials to the field

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