KR102634128B1 - Working machine and paddy field working machine - Google Patents

Abstract

In providing a hydrostatic continuously variable transmission device for each of the first drive target device and the second drive target device, it is possible to inexpensively supply hydraulic oil to the continuously variable transmission device.
In addition, in a working machine having a working part that supplies agricultural materials to the rice field while rotating up and down between the agricultural material supply section and the field floor, the supply amount of agricultural materials can be appropriately set.
In addition, there is a demand for a power-receiving work machine capable of smoothly shifting the power transmitted to the work device without shifting shock.
The drain port 109 of the first hydrostatic continuously variable transmission device 32 outputs output toward the first driven device, and the charge of the second hydrostatic continuously variable transmission device 35 outputs output toward the second driven device. A charge circuit 111 is connected to the port 110. The charge circuit 111 supplies exhaust oil discharged from the first continuously variable transmission device 32 as hydraulic oil to the second continuously variable transmission device 3 by the discharge pressure of the first continuously variable transmission device 32.
Additionally, it is provided with a transmission device 32 that changes the power of the prime mover 4. A driving power transmission system ( It is provided with a power transmission device (S) having a power transmission system (Y) for work that outputs output toward (22). In the order of transmitting power to the working power transmission system (Y) toward the working part 22, the continuously variable transmission device 35, the speed reduction mechanism 60, and the working part 22 are accelerated to a rotation speed of one revolution. A working part shifting device 70 is provided.
In addition, in the riding-type rice transplanter, a seedling device 1005 that performs seedling planting on the rice paddy field, a driving HST 1006 that changes the engine driving force, and a seedling device that changes the power from the driving HST 1006 Weekly HST (1007) transmitted to (1005), a setting week selection operation unit 1023 for selecting and operating a simulated planting interval S with respect to the rice paddy bottom by the model planting device 1005 from a plurality of setting weeks, and a selected setting interval Accordingly, a shift stage setting unit 1027 is provided to set the shift stage of the weekly HST 1007.

Description

Worker and faucet worker {WORKING MACHINE AND PADDY FIELD WORKING MACHINE}

The present invention relates to working machines.

Additionally, the present invention relates to a working machine that supplies agricultural materials to the rice field bottom.

Additionally, the present invention relates to a water-hydraulic work machine equipped with a work device for performing seedlings or seeding on the bottom of a rice paddy field.

For example, as disclosed in Patent Document 1, a hydrostatic continuously variable transmission device is provided exclusively for the left rear wheel that drives the left rear wheel, and a hydrostatic continuously variable transmission device is provided exclusively for the right rear wheel that drives the right rear wheel. There is a work vehicle equipped with the device.

In addition, there is a riding-type rice transplanter, which is an example of a work machine, disclosed in Patent Document 2. In Patent Document 2, the power of the engine is transmitted to the main gear, the shift power output by shifting by the main gear is branched into driving power and work power, and the driving power is transmitted to the front and rear wheels. , the power for work is transmitted to the mother machine mechanism through the work shift gear transmission.

Accordingly, even if the main gear mechanism is operated and the running speed of the aircraft changes, the power transmitted to the main gear mechanism is also the shifting power of the main gear mechanism, so the rotation by the mother gear mechanism is a setting set by the work shift gear mission. maintained at intervals. Then, by shifting the work shift gear transmission, the week by the mother planting mechanism can be changed and set.

In addition, as the above-mentioned water faucet work machine, for example, the water faucet work machine described in Patent Document 3 is already known. Patent Document 3 includes a working device for performing mother planting on the bottom of a rice field (“mother planting device [4]” in the document), a transmission device for shifting the engine driving force (“main transmission device [31]” in the document), and a transmission A water-hydraulic work machine (“rice transplanter” in the literature) equipped with a transmission device (“weekly shifting mechanism [36]” in the literature) that changes power from the device and transmits it to the working device is disclosed.

Japanese Patent Publication No. 2016-55815 Japanese Patent Publication No. 2014-70653 Japanese Patent Publication No. 2005-237281

Like the continuously variable transmission exclusively for the left rear wheel described above, a hydrostatic first continuously variable transmission device outputs output toward a first drive target device, and, like the above continuously variable transmission exclusively for the right rear wheel, output is output toward a second drive target device. In the work machine provided with a second continuously variable transmission device of the hydrostatic type that outputs, a dedicated hydraulic pump and charge circuit for supplying hydraulic oil to the first continuously variable transmission device are provided, and a dedicated hydraulic pump and charge circuit are provided for supplying hydraulic oil to the second continuously variable transmission device. If it is possible to supply hydraulic oil to each of the first continuously variable transmission device and the second continuously variable transmission device by providing a hydraulic pump and a charge circuit, the number of hydraulic pumps required increases, resulting in high costs.

In addition, even if the hydraulic pump is configured to be distributed by dividing the hydraulic oil from the hydraulic pump into the first continuously variable transmission device and the second continuously variable transmission device by using a flow distribution valve, and the hydraulic pump can be shared, a flow distribution valve is required, and the discharge flow rate is small. Many large hydraulic pumps are required, resulting in high costs.

The present invention provides a work machine that is provided with a hydrostatic continuously variable transmission device for each of a first drive target device and a second drive target device, and can inexpensively supply hydraulic oil to both continuously variable transmission devices.

In addition, when the conventional technology is adopted, the change setting of the interval (supply interval) in the direction in which agricultural materials are supplied to the rice paddy field is carried out step by step using a gear mission. In recent years, there has been an increasing demand to appropriately set the supply interval of agricultural materials according to the properties of the rice field or agricultural materials.

The present invention provides a working machine that can appropriately set the supply interval of agricultural materials in accordance with the properties of the rice field or agricultural materials.

In addition, in the electric power work machine described in Patent Document 3, the transmission device for the work device is comprised of a gear-type transmission device, so there is room for improvement from the viewpoint of smoothly shifting the power transmitted to the work device without shifting shock. There is.

In consideration of the above situation, there is a demand for a power receiving work machine capable of smoothly shifting the power transmitted to the work device without shifting shock.

The work machine according to the present invention is provided with a first hydrostatic continuously variable transmission device that outputs output toward a first driven device, and a second hydrostatic continuously variable transmission device that outputs output toward a second driven device, wherein the first It is connected to a drain port of the continuously variable transmission device and a charge port of the second continuously variable transmission device, and exhaust oil discharged from the first continuously variable transmission device is transferred to the second continuously variable transmission device by the discharge pressure of the first continuously variable transmission device. A charge circuit is provided to supply operating oil.

According to this configuration, exhaust oil discharged from the first continuously variable transmission device is supplied as hydraulic oil to the second continuously variable transmission device by the exhaust oil pressure of the first continuously variable transmission device, so a hydraulic pump is installed to supply hydraulic oil to the first continuously variable transmission device. You can do this, and there is no need to install a dedicated hydraulic pump for the second continuously variable transmission. Additionally, a smaller hydraulic pump can be adopted than when a flow distribution valve is employed.

Therefore, by providing a first continuously variable transmission for the first drive target device and a second continuously variable transmission for the second drive target device, it is possible to inexpensively supply hydraulic oil to both continuously variable transmissions.

In the present invention, it is preferable if a transmission case supporting the first continuously variable transmission device and the second continuously variable transmission device is provided, and the charge circuit is drilled into a wall of the transmission case.

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

In the present invention, the first continuously variable transmission device and the second continuously variable transmission device are supported on an upper part of the transmission case, and the charge circuit passes through a portion of the wall portion located at an upper part of the transmission case. It is desirable if you do it.

According to this configuration, the charge circuit is shortened, so it is easy to drill and install the charge circuit in the transmission case.

In the present invention, a traveling device drive case portion extending and protruding from the transmission case, an oil supply circuit for extracting lubricating oil from the transmission case and supplying the extracted lubricating oil as operating oil to the first continuously variable transmission, and the second It is desirable if a drain circuit for discharging waste oil from the continuously variable transmission to the traveling device drive case portion is provided.

According to this configuration, the exhaust oil from the second continuously variable transmission passes through the traveling device drive case portion and returns to the transmission case while being cooled in the traveling device drive case portion, making it easier to cool the oil compared to returning it directly to the transmission case. .

In the present invention, the drain circuit is preferably comprised of a groove formed on the inner surface of the second wall portion of the transmission case, and a cover member provided on the inner surface and closing the opening of the groove.

According to this configuration, forming a groove is easier than drilling a flow path into the second wall of the transmission case, so it is easy to form a drain circuit.

In the present invention, it is preferable that the first driven device is a traveling device and the second driven device is a working device that supplies agricultural materials to the field.

In working machines where packaging is the work object and oil leak prevention is important, oil leak prevention can be easily performed because a small number of small hydraulic pumps can be installed.

In the present invention, the shifting power output from the first continuously variable transmission device is branched into driving power and work power, the branched driving power is transmitted to the traveling device, and the branched work power is transmitted to the second continuously variable transmission. It is preferable if it is delivered to the working device through a device.

According to this configuration, even if the travel speed is changed by shifting the first continuously variable transmission device, the shifting power from the first continuously variable transmission device is transmitted to the work device, so the work situation of the work device changes regardless of the change in the travel speed. You can work without it. By changing the speed of the second continuously variable transmission device, the driving speed of the working device is changed regardless of the traveling speed, so the working situation of the working device can be changed regardless of the traveling speed.

In the present invention, the working device is preferably a seedling device that supplies seedlings as agricultural materials to packaging.

According to this configuration, mother planting can be performed in a state where the simulated planting situation does not change regardless of a change in traveling speed, or mother planting can be performed by changing the simulated planting situation regardless of the traveling speed.

In addition, the working machine of the present invention includes a working part that rotates up and down between the agricultural material supply part and the rice field bed to supply agricultural materials to the rice field bed, the power of the prime mover is input, and the input power is shifted to output shifting power. a transmission device, a branch portion that branches the shifting power output from the transmission device into driving power and work power, a driving power transmission system that outputs the driving power from the branch portion toward the traveling device, and the branch portion. A power transmission device is provided with a power transmission system for work that outputs work power from the work power transmission system toward the work section, and the work power transmission system includes a continuously variable transmission device, a speed reduction mechanism, and a work power transmission system in the order of transmitting power toward the work section. There is a working part shifting device that slows down the rotation speed of one rotation of the part.

According to this configuration, by changing the speed of the continuously variable transmission device, the speed of the working power transmitted to the working unit is shifted steplessly regardless of the speed of the running power, and agricultural materials are supplied to the rice field bed by the working unit. The gap (supply gap) in the direction of travel changes steplessly.

In order to set the supply interval wide, the work power transmitted to the working part is set at a low speed, so the continuously variable transmission can be set to a low speed shift state. If the continuously variable transmission is set to a low speed shift state tailored to the low speed of the work power, Power at low torque and low speed is output from the continuously variable transmission, and depending on the driving resistance of the working part, there are cases where the working part does not operate smoothly. Additionally, depending on the continuously variable transmission, the continuously variable transmission may vibrate or not operate smoothly. According to this configuration, even if the continuously variable transmission is set in a high-speed shifting state compared to the low speed of the working power to be transmitted to the working unit, the shifting power output by the continuously variable transmission is decelerated by the deceleration mechanism and transmitted to the working unit, The supply interval can be set wide while avoiding malfunction of the working part or continuously variable transmission.

In addition, in order to set the supply interval wide, the operating speed of the working part can be set to a low speed so that the working part rotates once at a low speed. However, if the operating speed of the working part is simply set to a low speed, the working part will only rotate once at a low speed. The elapsed time until it rises from the rice field bed becomes longer, and the working part towed by the aircraft travels agitates the rice field bed over a wide area, causing agricultural materials to be supplied to the rice field bed to spread from the designated supply point. Supply failures such as moving or moving occur. In order to set the supply interval narrowly, the operating speed of the working part can be set to high speed so that the working part rotates once at high speed. However, if the operating speed of the working part is only set to high speed, the working part will fall after reaching the bottom of the field. The elapsed time until the rise is shortened, resulting in supply failures such as agricultural materials that should be supplied to the field bottom by the work department being lifted from the field bottom by the work department. According to this configuration, by shifting the working part shifting device in accordance with the set supply interval, the rotation speed of one rotation of the working part can be accelerated, and when the working part rises with respect to the paddy field after reaching the bottom of the paddy field. Since the elapsed time can be adjusted so that it is not too long or too short, the supply interval can be set wide or narrow while avoiding poor supply of agricultural materials.

Therefore, since it is possible to finely change and set the supply interval in the direction in which the agricultural material moves, the supply interval of the agricultural material can be appropriately set in accordance with the properties of the rice field or the agricultural material.

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

According to this configuration, minor shifting, such as slightly shifting the shifting power output from the transmission device to the high-speed side or slightly shifting to the low-speed side, can be performed without difficulty, making it possible to change and set the supply interval of agricultural materials more finely. This allows the supply interval of agricultural materials to be set more appropriately.

In the present invention, the continuously variable transmission device is provided with an electric cylinder shaft externally fitted so as to be relatively rotatable to an output shaft of the continuously variable transmission device, the speed reduction mechanism is installed across the output shaft and the electric cylinder shaft, and the working unit It is preferable if the input side member of the transmission device is installed on the electric cylinder shaft.

According to this configuration, the continuously variable transmission, the speed reduction mechanism, and the working part transmission can be installed together in a direction along the output shaft axis direction of the continuously variable transmission, so a compact power transmission device can be obtained.

In the present invention, a transmission case for accommodating the working part shifting device and the speed reduction mechanism is provided, and the mission case has a case body in which the working part shifting device is located, and the speed reducing mechanism is located in the inside. It is preferable if the case cover part can be divided.

According to this configuration, when assembling the working part shifting device and the reduction mechanism to the transmission case, the reducing mechanism is located on the front side of the working part shifting device, which requires high-precision phase alignment of the input side member and the output side member, and the working part shifting device is It is easy to perform assembly work because it can be done while viewing.

In the present invention, the continuously variable transmission is supported on the outside of the case cover, and the output shaft of the continuously variable transmission includes an output shaft body penetrating the case cover from the outside to the inside, and the output shaft body among the output shaft bodies. It is desirable to have an extended output shaft that is non-relatively rotatable and detachably connected to a portion located within the transmission case, and that the deceleration mechanism and the electric tubular shaft externally fitted to the output shaft so as to be relatively rotatable are installed on the extended output shaft.

According to this configuration, by separating the extended output shaft from the output shaft main body, the speed reduction mechanism and the input side member of the working part shifting device can be separated from the continuously variable transmission together with the extending output shaft, so inspection of the reducing mechanism and the working part shifting device, etc. Easy to perform maintenance.

In the present invention, it is preferable if a working part clutch is installed below the working part shifting device in the transmission direction and inputs and cuts off power transmission to the working part.

According to this configuration, the working part is stopped by cutting off the power transmission to the working part in the transmission direction lower than the working part shifting device. Therefore, when the working part clutch is cut off, a fixed position stop mechanism is used to stop the working part at a specific position during one rotation. Since the installation can be done without considering the shifting state set in the working part shifting device, it is easy to equip the fixed position stop mechanism.

In the present invention, the agricultural material supply section is a seedling loading stand that stores seedlings as agricultural materials, and the working section is preferably a seedling device that takes out the seedlings from the seedling loading stand and supplies the taken out seedlings to the bottom of the field.

According to this configuration, seedling planting work can be performed with the daytime slightly changed.

In addition, a feature of the present invention is a work device for planting or seeding a rice paddy field, a transmission device for shifting engine driving force, a continuously variable transmission device for shifting power from the transmission device and transmitting it to the work device, It is provided with a setting interval selection operation unit that selects and operates a working interval for the rice field bed by the work device from a plurality of setting intervals, and a shift stage setting unit that sets a shift stage of the continuously variable transmission device according to the selected setting interval. there is.

According to this feature configuration, since the shifting device for the working device is configured as a continuously variable shifting device, the power transmitted to the working device can be shifted smoothly without shifting shock. In addition, although the transmission device for the work machine is a continuously variable transmission device, the correspondence relationship between the setting interval and the shift stage of the continuously variable transmission device is clear, and thereby the operator's operability can be improved.

In addition, in the present invention, it is suitable if a work interval adjusting unit is provided to adjust the work interval according to the actual vehicle speed of the aircraft.

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

Additionally, in the present invention, a receiving device for receiving location information from a satellite and a vehicle speed calculation unit for calculating the actual vehicle speed of the aircraft based on the location information received by the receiving device are provided, and the working interval adjusting unit is provided with the vehicle speed. It is appropriate to adjust the work interval according to the actual vehicle speed of the aircraft calculated by the calculation unit.

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

In addition, in the present invention, a wheel speed sensor is provided to detect the rotation speed of the wheel, and the vehicle speed calculator is configured to determine the speed of the aircraft based on the detection value of the wheel speed sensor when the receiving device is in a bad condition. It is appropriate to calculate the actual vehicle speed.

A correlation was confirmed between the detection value of the wheel speed sensor and the actual vehicle speed of the aircraft. According to this feature configuration, when the receiving device is not in good condition, the situation where the working interval cannot be adjusted can be avoided by using the wheel speed sensor as an alternative means.

In addition, in the present invention, it is suitable if the vehicle speed calculation unit calculates the actual vehicle speed of the aircraft based on the detection value of the wheel speed sensor, taking into account a predetermined wheel slip rate.

According to this feature configuration, a predetermined wheel slip rate is reflected in the actual vehicle speed of the aircraft calculated by the vehicle speed calculation unit, and the actual vehicle speed of the aircraft can be calculated with high precision.

In addition, in the present invention, an input rotation speed sensor is provided to detect the rotation speed of power input to the continuously variable transmission device, and the vehicle speed calculator is configured to detect the input rotation speed when the wheel speed sensor is in a bad condition. It is appropriate to calculate the actual vehicle speed of the aircraft based on the detected value of the sensor.

A correlation was confirmed between the detection value of the input rotation speed sensor and the actual vehicle speed of the aircraft. According to this feature configuration, when the receiving device and the wheel speed sensor are not in good condition, the situation where the work interval cannot be adjusted can be avoided by using the input speed sensor as an alternative means.

In addition, in the present invention, it is suitable if the transmission device and the continuously variable transmission device are constituted by a hydrostatic continuously variable transmission device.

According to this feature configuration, the power transmitted to the working device can be shifted more smoothly.

1 is a left side view showing the entire riding-type rice transplanter.
Figure 2 is a plan view showing the entire riding-type rice transplanter.
Figure 3 is a cross-sectional view of the mission case.
Figure 4 is a cross-sectional view of the mission case.
Figure 5 is a cross-sectional view of the mission case.
Figure 6 is a block diagram showing a power transmission device.
Fig. 7 is an explanatory diagram showing the operation of the shift key.
Figure 8 is a hydraulic circuit diagram.
Fig. 9 is a plan view showing the charge circuit.
Fig. 10 is a side view showing the drain circuit.
Fig. 11 is a vertical cross-sectional view showing the drain circuit.
Fig. 12 is an explanatory diagram showing the structure and operation of the shift key.
Fig. 13 is an explanatory diagram showing the structure and operation of the shift key.
Figure 14 is a left side view showing a riding-type rice transplanter.
Figure 15 is a plan view showing a riding-type rice transplanter.
Fig. 16 is a diagram showing a control block.

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

[About the overall configuration of the riding-type rice transplanter]

In the following description, with respect to the body 1 of the riding-type rice transplanter, the direction of arrow F shown in FIGS. 1 and 2 is referred to as “airframe front,” the direction of arrow B is denoted as “airframe rear,” and the direction of arrow R shown in FIG. 2 is denoted as “aircraft rear.” Let the direction of arrow L be “airframe right direction” and the direction of arrow L be “aircraft left direction”.

As shown in Figures 1 and 2, the riding-type rice transplanter is equipped with the right and left front wheels 2 as a traveling device to be steerable and drivable, and the right and left rear wheels 3 as a traveling device are driven. It is equipped with an aircraft (1) that is capable of being equipped. A motor unit 5 having an engine 4 as a prime mover is formed in the front part of the body 1. At the rear of the body 1, a riding-type driver unit 8 is formed, which includes a driver seat 6 and a steering wheel 7 for steering the front wheels 2. The steering operation of the front wheels 2 by the steering wheel 7 is performed through the torque generator 100 (see FIG. 8) as a power steering device.

A model device 20 as a working device is connected to the rear part of the body 1 through a link mechanism 9. The mother unit device 20 is raised and lowered between the lowering working state and the lifting non-working state by the vertical swing operation of the link mechanism 9 with respect to the body 1. The rocking operation of the link mechanism 9 with respect to the body 1 is performed by the expansion and contraction operation of the hydraulic lifting cylinder 101. Spare hair storage devices 10 are installed on both left and right horizontal sides of the front part of the body 1. Each of the left and right spare seedling storage devices 10 is equipped with three spare seedling loading stands 11. The three spare parent loading stands 11 can be switched between an extended state for use in which they are lined up in a direction along the front-back direction of the aircraft 1 and a folded state in which they overlap in three stages up and down. The antenna unit 13 for satellite navigation is supported across the pillars 12 of the spare mother storage device 10 on the left and the pillars 12 of the spare mother storage device 10 on the right. A fertilization device 14 is installed at the rear of the aircraft 1. When seedling planting is performed using the mother planting device 20, the fertilization device 14 makes it possible to supply fertilizer near the planting seedlings.

In addition, as shown in Figures 1 and 2, the riding-type rice transplanter is equipped with the right and left front wheels 2 as a traveling device to be steerable and drivable, and the right and left rear wheels 3 as a traveling device There is a body 1 equipped to be driven. A motor unit 5 having an engine 4 as a prime mover is formed in the front part of the body 1. At the rear of the body 1, a riding-type driver unit 8 is formed, which includes a driver seat 6 and a steering wheel 7 for steering the front wheels 2.

A model device 20 is connected to the rear part of the body 1 through a link mechanism 9. The mother unit device 20 is raised and lowered between the lowering working state and the lifting non-working state by the vertical swing operation of the link mechanism 9 with respect to the body 1. Spare hair storage devices 10 are installed on both left and right horizontal sides of the front part of the body 1. Each of the left and right spare seedling storage devices 10 is equipped with three spare seedling loading stands 11. The three spare parent loading stands 11 can be switched between an extended state for use in which they are lined up in a direction along the front-back direction of the aircraft 1 and a folded state in which they overlap in three stages up and down. The antenna unit 13 for satellite navigation is supported across the pillars 12 of the spare mother storage device 10 on the left and the pillars 12 of the spare mother storage device 10 on the right. A fertilization device 14 is installed at the rear of the aircraft 1. When seedling planting is performed using the mother planting device 20, the fertilization device 14 makes it possible to supply fertilizer near the planting seedlings.

[About the configuration of the mother planting device 20]

As shown in FIGS. 1 and 2, the mother planting device 20 is provided with a planting base 20A composed of four planting drive cases 21 arranged at intervals in the transverse direction of the base 1, etc. there is. A mother planting mechanism 22 as a working part is installed on both horizontal sides of the rear portion of each of the four planting drive cases 21. A total of eight mother planting mechanisms 22 are installed. Each of the eight mother planting mechanisms 22 is attached to the rotary rotor 22a rotatably supported by the planting drive case 21 and both end portions of the rotary rotor 22a in the method shown in FIGS. 2 and 6. It is provided with a planting arm 22b rotatably supported. Each of the pair of planting arms 22b is provided with a planting hook 22c.

A seedling loading stand 23 as an agricultural material supply section is installed above the front part of the planting base 20A. As shown in FIG. 2, eight seedling loading parts 23a are formed on the seedling loading stand 23, one by one corresponding to each of the eight seedling planting mechanisms 22. That is, the eight seedlings supplied to the seedling equipment 22 are arranged in a row in the horizontal width direction of the planting base 20A on the seedling loading stand 23, and are stored. A vertical transport belt 24 is installed in each of the eight mother loading parts 23a.

When the mother planting device 20 is lowered to the lowering operation state and operated in the driving state, power is supplied from the engine 4 to the feed case 25 (see FIG. 1) supported on the front part of the planting body 20A. It is transmitted and input from the feed case 25 to each of the four planting drive cases 21, and each of the eight mother planting mechanisms 22 is driven by the power of the planting drive case 21, so that each of the mother planting mechanisms 23 ) A rotational movement is performed for the model planting section between the bottom of the field and the bottom of the rice field. When the seedling planting mechanism 22 rotates, the planting hooks 22c of the pair of planting arms 22b alternately reach the seedling outlet formed by the guide rail 26 on the lower end side of the seedling loading stand 23. and rotates up and down between the rice field bottom, and each planting hook 22c of the pair of planting arms 22b takes out the seedlings for planting from the seedlings on the seedling loading stand 23 at the seedling extraction port. The seedlings are transported downward and planted on the bottom of the rice field.

The seed horizontal transfer mechanism (not shown) installed across the seed loading table 23 and the feed case 25 is driven by the power of the feed case 25 in conjunction with the rotational movement of the mother planting mechanism 22. , the seedling loading stand 23 is reciprocated in the horizontal width direction of the planting base 20A by linking the rotational movement of the mother planting mechanism 22 by the seedling horizontal transfer mechanism. As a result, the seedlings loaded on each of the eight seedling loading units 23a are reciprocated in the horizontal direction with respect to the seedling mechanism 22, and each of the eight seedling mechanism 22 is loaded on the seedling loading section 23a. The seedlings for planting are sequentially taken out from one end side toward the other end side in the transverse width direction of the seedlings.

When the mother loading table 23 reaches the end of the stroke in the horizontal transfer on the left and right, a vertical transfer mechanism (not shown) installed across the mother loading table 23 and the feed case 25 moves the feed case 25. ) is driven by the power of each capillary feed belt 24 of the eight cap loading parts 23a is driven by a capillary feed mechanism (not shown). That is, each time the bristle loading table 23 reaches the end of the stroke in the left and right horizontal transfer, the bristles loaded on each of the eight bristle loading units 23a are moved by the bristle seed unit mechanism ( Towards 22), the seedlings for planting taken out by the seedling mechanism 22 are vertically transferred by an amount corresponding to the length in the longitudinal direction.

In the model unit device 20, when the body 1 is driven in a lowered state, eight model unit mechanisms 22 are provided by the power transmitted from the engine 4 to the feed case 25, The seedling loading table 23 and the seedling transport belt 24 are driven, and eight seedling planting devices 22 perform seedling planting. 1 trillion worth of mother planting by each of the eight mother planting mechanisms 22 is performed on a weekly basis D (see Fig. 6) by alternating mother planting parts of a pair of planting hooks 22c. Weekly D is the planting interval in the direction of movement of the body 1.

[About the configuration of power transmission]

As shown in FIG. 1, a transmission case 30 is installed at the rear of the engine 4. The mission case (30) constitutes the front part of the fuselage (1). As shown in FIG. 3, front wheel drive case portions 31 as traveling device drive case portions extend and protrude from both horizontal portions of the lower portion of the transmission case 30 toward the horizontal outer side of the body. The transmission case 30 rotatably supports the left and right front wheels 2 by the left and right front wheel drive case portions 31.

Additionally, as shown in FIG. 1, a transmission case 30 is installed at the rear of the engine 4. The mission case (30) constitutes the front part of the fuselage (1). As shown in FIG. 3, the front wheel drive case portion 31 extends and protrudes outward from the lower portion of the transmission case 30 on both sides. The transmission case 30 rotatably supports the left and right front wheels 2 by the left and right front wheel drive case portions 31.

As shown in FIGS. 3 and 4, the first hydrostatic continuously variable transmission 32, which is a transmission device for driving and work, is supported on the transmission case 30. The first continuously variable transmission 32 is supported on the upper left horizontal outer portion of the transmission case 30. As shown in FIG. 1, the output shaft of the engine 4 and the input shaft 32a (see FIG. 3) of the first continuously variable transmission 32 are interlocked and connected by a power transmission belt 33. The power of the engine 4 is input to the first continuously variable transmission 32 through the power transmission belt 33. The input shaft 32a of the first continuously variable transmission device 32 is a pump shaft provided in the hydraulic pump constituting the first continuously variable transmission device 32.

In the first continuously variable transmission device 32, the shift operation shaft 32b (see FIG. 3) rotatably supported on the casing is rotated, so that the inclined plate angle of the hydraulic pump (not shown) is changed to shift to neutral. Shifts are changed to a shift state, a forward shift state, and a reverse shift state. When the first continuously variable transmission device 32 shifts to the neutral shifting state, the output shaft 32c (see FIG. 3) of the first continuously variable transmission device 32 stops. The output shaft 32c of the first continuously variable transmission device 32 is a motor shaft provided in the hydraulic motor constituting the first continuously variable transmission device 32. When the first continuously variable transmission device 32 is shifted to the forward shifting state, the power from the engine 4 is converted into forward power by the hydraulic pump and the hydraulic motor, and the rotational speed is continuously changed to the shifting power. It is output from the output shaft 32c. When the first continuously variable transmission device 32 is shifted to the reverse shift state, the power from the engine 4 is converted into reverse power by the hydraulic pump and the hydraulic motor, and the speed change power is changed steplessly. It is output from the output shaft 32c.

As shown in FIG. 4, a hydrostatic second continuously variable transmission device 35, which is a continuously variable transmission device for work, is supported on the transmission case 30. The second continuously variable transmission 35 is supported on the right horizontal outer portion of the upper part of the transmission case 30. Among the input shafts 35a of the second continuously variable transmission 35, the cooling fan 36 is supported so as not to rotate relative to the portion that protrudes outside the housing. The input shaft 35a of the second continuously variable transmission device 35 is a pump shaft provided in the hydraulic pump constituting the second continuously variable transmission device 35.

3 and 4, inside the transmission case 30, a branch shaft 37 as a branch part, a sub transmission 40 for running, a front wheel differential mechanism 50, and a deceleration mechanism for work ( 60), a working part shifting device 70 is installed. As shown in FIG. 3, the output shaft 80 for the rear wheels is rotatably supported on the first output boss portion 30c formed in the rear portion of the transmission case 30. As shown in FIG. 4, the output shaft 89 for work is rotatably supported on the second output boss portion 30d formed in the rear portion of the transmission case 30. Among the work output shafts 89, the work portion clutch 90 is installed in a portion located inside the second output boss portion 30d.

As shown in FIG. 6, the branch shaft 37, the auxiliary transmission device 40, the second continuously variable transmission device 35, the reduction mechanism 60, the working portion shifting device 70, and the working portion clutch 90. A power transmission device (S) for driving and work is configured. The driving power transmission system A working power transmission system Y in the power transmission device S is configured by the second continuously variable transmission 35, the speed reduction mechanism 60, the working part shifting device 70, and the working part clutch 90. there is.

In the power transmission device S, the shifting power shifted by the first continuously variable transmission 32 is input from the output shaft 32c to the branch shaft 37, and is converted into driving power and work power by the branch shaft 37. and the branched driving power is output toward the front wheels (2) and rear wheels (3) by the driving power transmission system (X). In detail, the branched driving power is input to the driving auxiliary transmission device 40, and is output from the auxiliary transmission device 40 toward the front wheels 2 and the rear wheels 3. The branched power for work is output toward the model machine 22 of the model machine 20 and the like by the work power transmission system Y. In detail, the branched working power is first inputted to the second continuously variable transmission device 35, then inputted from the second continuously variable transmission device 35 to the speed reduction mechanism 60, and then inputted from the speed reduction mechanism 60. It is input to the working part shifting device 70, and then inputs from the working part shifting device 70 to the working part clutch 90, and from the working part clutch 90 to the mother planting device 22 of the mother planting device 20. ) is output to, etc. That is, the second continuously variable transmission device 35, the speed reduction mechanism 60, the work part transmission device 70, and the work part clutch 90 installed in the work power transmission system Y are in this described order and the second continuously variable transmission. In a state in which the order in which the device 35, the speed reduction mechanism 60, the working part shifting device 70, and the working part clutch 90 output output toward the mother planting device mechanism 22 of the mother planting device 20, etc. are consistent, It is installed.

[About the configuration of the branch shaft 37]

Specifically, as shown in FIGS. 3 and 4, the branch shaft 37 is rotatably supported on the left and right transverse walls of the transmission case 30. The end of the branch shaft 37 on the left transverse wall side and the output shaft 32c of the first continuously variable transmission 32 are connected in a non-relatively rotatable manner by spline engagement. The end of the branch shaft 37 on the right transverse wall side and the input shaft 35a of the second continuously variable transmission 35 are connected by a connecting member 38 so as not to rotate relative to each other. In the middle of the branch shaft 37, two input gears 41 and 42 are installed in the driving auxiliary transmission 40 so that they cannot rotate relative to each other. The shifting power output from the first continuously variable transmission device 32 is branched into driving power and work power by the branch shaft 37, and the branched driving power is input to the driving sub-transmission device 40, The branched working power is input to the second continuously variable transmission device (35).

[About the auxiliary transmission device (40) for driving]

As shown in FIG. 3, the driving auxiliary transmission device 40 includes two input gears 41 and 42 installed on the branch shaft 37 so as not to rotate relative to each other, and parallel to the branch shaft 37. One output shaft (43) is provided with a shift gear (44) supported on the spline portion of the output shaft (43) so that it cannot rotate relative to the other and can slide.

In the auxiliary transmission device 40 for driving, the shift gear 44 is operated to slide, so that the gear portion 44a on the large diameter side of the shift gear 44 is engaged with the input gear 41 on the small diameter side. This results in a low-speed shifting state, and the small-diameter side gear portion 44b of the shift gear 44 engages with the large-diameter input gear 42, resulting in a high-speed shifting state. In the driving auxiliary transmission device 40, even when the shift operation is performed to either the low speed side or the high speed side, the driving power branched by the branch shaft 37 is transferred to the output shaft ( 43), and is transmitted from the output shaft 43 to the input shaft 51 of the front wheel differential mechanism 50 through the gear linkage mechanism 45.

[About the configuration of the front wheel differential mechanism 50]

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

[Configuration of the output shaft 80 for the rear wheels]

As shown in FIG. 3, the output shaft 80 for the rear wheels is provided with an input gear 82 formed at an end within the transmission case of the output shaft 80 for the rear wheels to be non-rotatable relative to the other. The input gear 82 is meshed with a power transmission gear 55 installed to be non-rotatable relative to the input shaft 51 of the front wheel differential mechanism 50.

In the output shaft 80 for the rear wheels, the driving power transmitted from the auxiliary transmission device 40 for driving to the input shaft 51 of the front wheel differential mechanism 50 is transmitted to the power transmission gear 55 and the input gear 82. is input, and the input driving power is output from the end opposite to the input side of the rear wheel output shaft 80. As shown in FIG. 1, the driving power output from the rear-wheel output shaft 80 is connected to the rear-wheel drive case 83 by a rotating shaft 84 that extends and protrudes from the rear-wheel output shaft 80 to the rear-wheel drive case 83. is delivered to

A multi-plate friction brake 85 is mounted on the output shaft 80 for the rear wheel. In the friction brake 85, the operating shaft 86 rotatably supported by the first output boss portion 30c is rotated by the operating arm 87, so that the friction plate is moved by the pressing member 88. The press-contacted input state is switched to the disconnected state in which the press-contact by the pressing member 88 of the friction plate is released.

[Configuration of the second continuously variable transmission 35]

As shown in FIGS. 4 and 5, the second continuously variable transmission device 35 has a shift operation shaft 35b rotatably supported on the casing. As shown in FIG. 9, the second continuously variable transmission device 35 is provided with a shift regulation portion 122. The rotational operation of the shift control shaft 35b is controlled by a shift regulation unit so that the change in the tilt angle of the hydraulic pump due to the rotation of the shift control shaft 35b cannot be changed to the tilt angle for neutral, forward, or reverse rotation. It is regulated by (122).

In the second continuously variable transmission device 35, when shifting to the neutral shifting state, the output shaft 39 of the second continuously variable transmission device 35 stops. When the gear is shifted to the forward rotation side, the working power input from the branch shaft 37 to the input shaft 35a is converted into forward rotation power by the hydraulic pump and hydraulic motor, and the rotation speed is changed steplessly. It is output from the output shaft 39 as power.

Additionally, the second continuously variable transmission device 35 is provided with a shift operation shaft 35b rotatably supported on the casing, as shown in FIGS. 4 and 5. In the second continuously variable transmission device 35, by rotating the shift operation shaft 35b, the inclination plate angle of the hydraulic pump is changed to change to a neutral shift state, a forward shift state, and a reverse rotation side shift state. It shifts. When the second continuously variable transmission device 35 shifts to the neutral shifting state, the output shaft 39 of the second continuously variable transmission device 35 stops. When the second continuously variable transmission device 35 shifts to the forward rotation side shift state, the working power input from the branch shaft 37 to the input shaft 35a is converted into forward rotation power, and the rotation speed is continuously changed. The transmission power is output from the output shaft 39.

[About the speed reduction mechanism (60) for work]

As shown in FIGS. 4 and 5, the speed reduction mechanism 60 for work includes an output shaft 39 of the second continuously variable transmission 35 and an electric cylinder shaft 61 mounted externally so as to be relatively rotatable to the output shaft 39. ) is installed throughout. In detail, the output shaft 39 of the second continuously variable transmission 35 includes an output shaft main body 39A and an extended output shaft 39B, as shown in FIG. 3 . The speed reduction mechanism 60 for work is installed across the extended output shaft 39B of the output shaft 39 and the end of the electric cylinder shaft 61 on the second continuously variable transmission side.

Specifically, as shown in FIG. 5, the speed reduction mechanism 60 has an input gear 62 installed to be non-rotatable relative to the output shaft 39, and can be rotated relative to the output shaft 71 of the working part transmission device 70. The first intermediate gear 63 is supported, the second intermediate gear 64 is installed to the boss portion of the first intermediate gear 63 so that it cannot rotate relative to the other, and the electric tubular shaft 61 is engaged with the second intermediate gear 64. ) is provided with an output gear 65 installed in a non-relatively rotating manner. The input gear 62 is installed on the extended output shaft 39B of the output shaft 71. The output gear 65 is installed on the short side portion of the electric cylinder shaft 61 on the second continuously variable transmission side.

In the speed reduction mechanism 60 for work, the shifting power output by the second continuously variable transmission device 35 is reduced between the input gear 62 and the first intermediate gear 63, and the second intermediate gear 64 and the output gear 65 and are transmitted from the output gear 65 to the electric tubular shaft 61.

[Configuration of the working part shifting device 70]

As shown in FIGS. 4 and 5, the working part transmission device 70 includes an input side gear 72 as four input side members installed to be non-relatively rotatable on the electric cylinder shaft 61, and an input side gear 72 installed to be relatively rotatable on the output shaft 71. It is provided with four output side gears (73). The input side gear 72 is installed on the end side of the electric cylinder shaft 61 opposite to the end side where the speed reduction mechanism 60 is installed. As shown in FIG. 7, the four input side gears 72 are aligned and spaced apart by spacers 98.

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

The first input gear 72a and the first output gear 73a are made of circular gears with the same outer diameter. The second, third, and fourth input gears 72b, 72c, and 72d, and the second, third, and fourth output gears 73b, 73c, and 73d are elliptical gears, eccentric gears, or non-circular gears. It is composed by

As shown in FIGS. 5 and 7, the working part shifting device 70 includes a key groove 74 formed on the output shaft 71, a shift key 75 slidably accommodated in the key groove 74, and a transmission case 30. ) and a shift operation shaft 76 that is slidably supported across the boss portion 30e and the output shaft 71. The end of the shift operation shaft 76 on the output shaft side is engaged with the end of the shift key 75 so as to be capable of being pressed and pulled.

In the working part shifting device 70, the shift key 75 is moved in the key groove 74 by a slide operation of the shift operation shaft 76, and the key protrusion 77 of the shift key 75 is rotated at 4 They are alternatively opposed to the two output-side gears 73, and the key protrusions 77 are engaged and inserted into the engaging grooves 78 of the output-side gear 73 to change gears in four types of shifting states. When the key protrusion 77 is engaged with each of the engaging grooves 78 of the four output side gears 73, the positioning sphere 96 is pressed against the shifting key 75 by the positioning spring 97. , the shift key 75 is positioned by the positioning sphere 96 at each shift position. The key protrusion 77 is manufactured by fine blanking processing or sintering. As shown in FIG. 7, the bottom portion 77a of the key protrusion 77 is connected to the engaging groove 78 of the output side gear 73 next to the output side gear 73 into which the key protrusion 77 is inserted. It is shaped like a cliff to prevent entry.

That is, in the working part shifting device 70, when the key protrusion 77 is engaged and inserted into the engaging groove 78 of the first output side gear 73a, the gear is shifted to the first shifting state. When the gear is shifted to the first shifting state, the first output side gear 73a and the output shaft 71 are connected to each other so that they cannot rotate relative to each other by the key protrusion 77, and are transmitted to the electric cylinder shaft 61 by the speed reduction mechanism 60. The working power is transmitted to the output shaft 71 through the first input side gear 72a, the first output side gear 73a, and the key protrusion 77, so that the angular speed of one rotation of the output shaft 71 does not change, and 1 Working power of constant rotation with a constant rotation speed is output from the output gear 79 of the output shaft 71.

In the working part shifting device 70, when the key protrusion 77 is inserted into the engaging groove 78 of the second output side gear 73b, the gear is shifted to the second shifting state, and the key protrusion 77 is in the second gear shift state. 3 When inserted into the engaging groove 78 of the output-side gear 73c, the gear shift is in the third shifting state, and when the key protrusion 77 is inserted into the engaging groove 78 of the fourth output-side gear 73d, , the gear is shifted to the fourth gear shift state. In the case of shifting to any of the second shift state, third shift state, and fourth shift state, the output side gears 73b, 73c, and 73d corresponding to the shift state and the output shaft 71 are connected to the key protrusion 77. It is connected so that relative rotation is not possible, and the working power transmitted to the electric cylinder shaft 61 by the reduction mechanism 60 is input side gears 72b, 72c, 72d, output side gears 73b, 73c, corresponding to the shifting state. 73d) and the key protrusion 77 are transmitted to the output shaft 71, the angular speed of one rotation of the output shaft 71 changes high and low, and the working power of the inconstant rotation given the speed of one rotation is given to the output gear. It is output from (79). In the case of shifting to the second shifting state, the case of shifting to the third shifting state, and the case of shifting to the fourth shifting state, even if the location of the part that becomes rapid during one revolution is different, or the part that becomes rapid is the same. , the speed in the rapid part may be different.

[Configuration of the working part clutch 90]

As shown in FIG. 5, the working part clutch 90 is installed lower than the working part shifting device 70 in the transmission direction. Specifically, the working part clutch 90 is installed between the output gear 79 of the working part transmission device 70 and the working output shaft 89. The working power of constant speed rotation and uneven speed rotation output from the working part transmission device 70 is input to the input side clutch member 91 of the working part clutch 90 in the original rotation state, and the output side clutch of the working part clutch 90 It is transmitted from the member 92 to the output shaft 89 for work.

In the working portion clutch 90, the operating shaft 93 slidably supported by the second output boss portion 30d is pressed toward the inside of the second output boss portion 30d, thereby causing the operating shaft 93 to The tip portion 93a of the output-side clutch member 92 touches the fixed position stop cam portion 92a, and the output-side clutch member 92 resists the spring 94 and is separated from the input-side clutch member 91, resulting in a disconnection state. Thus, power transmission to the mother planting unit 20 is cut off by the working unit clutch 90. As the operating shaft 93 is pulled toward the outside of the second output boss portion 30d, the tip portion 93a of the operating shaft 93 deviates from the output-side clutch member 92, and the output-side clutch member 92 is released from the spring. It is engaged with the input side clutch member 91 by (94) to enter the input state, and power transmission to the mother planting device 20 is input through the working portion clutch 90.

[Configuration of the work output shaft (89)]

The output shaft 89 for work is linked to the input shaft of the feed case 25 through the rotation shaft 81 (see FIG. 1). The working power of constant speed rotation and uneven speed rotation transmitted from the working part clutch 90 to the working output shaft 89 is transmitted to the feed case 25 through the rotating shaft 81 in the same rotation state. The working power of constant speed rotation and non-constant speed rotation transmitted to the feed case 25 is transmitted to each of the eight mother planting mechanisms 22 through the planting drive case 21 in the same rotation state.

When not carrying out planting work, such as moving driving, the drive is driven with the driving auxiliary transmission device 40 in a high-speed shifting state, and when planting work is performed, the driving auxiliary transmission device 40 is shifted to low speed. It is driven with the gear shift on the left side. During the planting operation, by shifting the first continuously variable transmission device 32, the power of the engine 4 is shifted by the first continuously variable transmission device 32 to the front wheels 2 and the rear wheels 3. transmitted, the running speed of the aircraft 1 can be changed. Even if the running speed of the aircraft 1 is changed, the shifting power of the first continuously variable transmission device 32 is transmitted to the model unit mechanism 22 so that the rotational speed of one revolution of the model unit mechanism 22 is equal to that of the aircraft 1. It changes in conjunction with the change in running speed, and the model part by the model part mechanism 22 changes in the shifting state of the second continuously variable transmission device 35, which has been previously shifted, regardless of the change in the traveling speed of the aircraft 1. This is done while maintaining the weekly D1 of the width set accordingly.

By shifting the second continuously variable transmission device 35, the working power from the branch shaft 37 is shifted by the second continuously variable transmission device 35 and is transmitted to the mother machine mechanism 22, so that the mother machine mechanism 22 ) The rotational speed of one revolution changes regardless of the running speed of the aircraft (1). As a result, the model portion by the model portion mechanism 22 is a main D2 whose width is set according to the shifting state of the second continuously variable transmission device 35 in which the shift operation is performed, and the shift operation of the second continuously variable transmission device 35 is performed. This is done with a week of width different from the week of width before D1.

When changing day D to a not-so-wide day or a not-so-narrow day, the working part shifting device 70 is shifted to the first shift state. In that case, the working power of the constant speed rotation set by the working part shifting device 70 is transmitted to the mother planting part mechanism 22, that is, the rotational speed of one rotation of the mother planting part mechanism 22 is changed to the working part shifting device ( The rotational speed is set to be constant according to the first gear shift state in 70), and the mother planting mechanism 22 performs mother planting while rotating at a rotational speed in which the rotational speed of one revolution is a constant speed.

When changing day D to a wide day or a narrow day, shift the working part shifting device 70 to a shift state corresponding to the width of day D to be changed among the second shift state, third shift state, and fourth shift state. Leave it. In that case, the working power of the inconstant rotation set according to the shifting state of the working part transmission device 70 is transmitted to the mother planting part mechanism 22, that is, the rotational speed of one rotation of the mother planting part mechanism 22 is equal to the weekly D The speed corresponding to the width is given by the working part transmission device 70, so that the moving speed when the planting hook 22c plants the seedlings on the field bottom is when the planting hook 22c is located at a location above the field bottom. In a state where the moving speed is higher than the moving speed of, or in a state where the moving speed when the planting hook 22c is planting a seedling is lower than the moving speed when the planting hook 22c is located at a location above the bottom of the field. The mother planting device 22 performs mother planting. Regardless of the width or narrowness of day D, the seedlings are carried out in a state where the rice field bottom is not stirred and disturbed by the planting hook 22c, or the seedlings for planting are not lifted from the field bed by the planting hook 22c. Lose.

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

As shown in FIGS. 3 and 4, the transmission case 30 includes a case body 30A and a case cover portion 30B that closes the lateral opening of the case body 30A. The case lid portion 30B is connected to the end having the transverse opening of the case body 30A by a connecting bolt (not shown). The mission case 30 can be divided into a case main body 30A and a case cover portion 30B.

The first continuously variable transmission 32 is supported on the outside of the case body 30A, as shown in FIGS. 3 and 4. As shown in FIG. 4, the second continuously variable transmission device 35 is supported on the outside of the case cover portion 30B. As shown in FIGS. 3 and 4, the working part transmission device 70 and the driving auxiliary transmission device 40 are installed inside the case body 30A. As shown in FIG. 4, the speed reduction mechanism 60 is installed inside the case lid portion 30B.

As shown in FIG. 3, the output shaft body 39A of the output shaft 39 of the second continuously variable transmission 35 penetrates the case lid portion 30B from the outside to the inside. The extended output shaft 39B of the output shaft 39 is non-relatively rotatable and detachably connected to a portion of the output shaft main body 39A located within the transmission case. Since the reduction mechanism 60 and the electric cylinder shaft 61 are installed on the extended output shaft 39B, by separating the extended output shaft 39B from the output shaft main body 39A, the reduction mechanism 60 and the working part transmission device ( The input side gear 72 of 70 is separated from the second continuously variable transmission device 35 together with the extended output shaft 39B.

[Configuration for supplying oil to the first continuously variable transmission device 32 and the second continuously variable transmission device 35]

As shown in FIG. 8, an oil supply circuit 104 is connected to the transmission case 30 and the two charge ports 103 of the first continuously variable transmission 32. The lubricating oil stored in the transmission case 30 is supplied as operating oil to the first continuously variable transmission 35 through the oil supply circuit 104.

Specifically, the oil supply circuit 104 includes a suction passage 104a with one end connected to the transmission case 30, a hydraulic pump 105 with a suction portion connected to the other end of the suction passage 104a, and a hydraulic pump ( A first oil supply passage 104b extending and protruding from the discharge portion of the first oil supply passage 105), a second oil supply passage 104c whose one end is connected to the extending protruding end of the first oil supply passage 104b through a torque generator 100, At the other end of the 2 oil supply path 104c, a third oil supply path 104d is provided, one end of which is connected through the control valve circuit 106 of the lifting cylinder 101. A branch flow path portion 104e divided into two is provided on the other end side of the third oil supply path 104d. One side of the two branch passage portions 104e is connected to one side of the two charge ports 103 of the first continuously variable transmission device 32, and the other side of the two branch passage portions 104e is connected to the first continuously variable transmission device. It is connected to the other side of the two charge ports 103 of (32). As shown in FIGS. 3 and 4, the hydraulic pump 105 is supported on the right horizontal outer portion of the upper part of the transmission case 30. The drive shaft 105a of the hydraulic pump 105 and the input shaft 32a of the first continuously variable transmission 32 are linked by a rotation shaft 107. The hydraulic pump 105 is driven by the input shaft 32a of the first continuously variable transmission 32.

In the oil supply circuit 104, as shown in FIG. 8, lubricating oil in the transmission case 30 is taken out by the hydraulic pump 105. The extracted lubricating oil is supplied to the torque generator 100 through the first oil supply passage 104b by the hydraulic pump 105, and is supplied from the torque generator 100 to the second oil supply passage 104c and the control valve circuit 106. It is supplied to the third oil supply path 104d through the oil supply path 104d, and is supplied as hydraulic oil to the first continuously variable transmission device 32 from the two branch passage portions 104e of the third oil supply path 104d.

As shown in Fig. 8, the drain passage 108 of the lifting cylinder 101 is connected to a portion upstream of the two branch passage portions 104e of the third oil supply passage 104d. The waste oil of the lifting cylinder 101 is supplied as hydraulic oil to the first continuously variable transmission device 32 through the third oil supply path 104d.

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

As shown in FIG. 9, the charge circuit 111 is drilled into the wall of the mission case 30. Specifically, the charge circuit 111 includes an upper wall portion 102 as a portion located at the upper part of the mission case 30 among the walls of the mission case 30, and a mission case 30 among the wall portions of the mission case 30. Perforations are installed in the transverse wall portion 113 located on the horizontal side of. The upper wall portion 102 spans the case body 30A and the case lid portion 30B. The horizontal wall portion 113 is a horizontal wall portion of the case cover portion 30B. A torque generator support portion 114 for supporting the torque generator 100 is formed on the upper portion of the front portion of the transmission case 30. The charge circuit 111 is a first transverse circuit portion 111a that passes through the interior of the upper wall portion 102 in a portion rearward of the torque generator support portion 114 in a direction along the transverse width direction of the body 1. ), an anteroposterior circuit portion 111b passing through the interior of the portion on the horizontal end side on the first continuously variable transmission side of the upper wall portion 102 in a direction along the anteroposterior direction of the body 1, and a case cover portion ( A vertical circuit portion 111c passes through the interior of the horizontal wall portion 113 in the case cover portion 30B in a direction along the vertical direction of the body 1, It is provided with a second horizontal circuit portion 111d along the boss portion 115 that protrudes in this direction. The forward-backward circuit portion 111b connects the first lateral circuit portion 111a and the drain port 109 of the first continuously variable transmission 32. The vertical circuit portion 111c connects the first horizontal circuit portion 111a and the second horizontal circuit portion 111d. The second lateral circuit portion 111d is connected to the charge port 110 of the second continuously variable transmission 35.

As shown in FIG. 8, a drain circuit 117 is provided to communicate the drain port 116 of the second continuously variable transmission 35 to the transmission case 30. The exhaust oil discharged from the second continuously variable transmission 35 is returned to the transmission case 30 by the drain circuit 117.

Specifically, as shown in FIGS. 9, 10, and 11, the drain circuit 117 includes a groove 118 formed on the inner surface of the transverse wall portion 113 as the second wall portion of the mission case 30, and a groove 118 ) is composed of a cover member 119 that closes the opening. The cover member 119 is installed on the inner surface of the transverse wall portion 113 using a connecting screw 120. The upper end of the groove 118 communicates with the drain port 116 of the second continuously variable transmission 35, as shown in FIG. 11. As shown in FIG. 11, the lower end of the groove 118 communicates with the through hole 121 of the transverse wall portion 113, and communicates with the inside of the front wheel drive case portion 31 through the through hole 121. there is.

The exhaust oil from the second continuously variable transmission 35 is discharged into the inside of the front wheel drive case 31 by the drain circuit 117, and is cooled through the inside of the front wheel drive case 31, thereby forming the transmission case 30. returns to the inside of

[Configuration of the shifting key 75]

In addition, the shift key 75 shown by a solid line in FIG. 7 is operated to the shift position where the key protrusion 77 is inserted into the engaging groove 78 of the second output side gear 73b, and is in this shift position. It is positioned by a positioning sphere 96 and a positioning spring 97. The shift key 75 is operated to a shift position where the key protrusion 77 is engaged in the engaging groove 78 of any output side gear 73 among the first output side gear 73a to the fourth output side gear 73d. Even in this case, the shift position is determined by the positioning sphere 96 and the positioning spring 97.

The key protrusion 77 has a pull-side inclined portion K1 and a push-side inclined portion K2, as shown in FIGS. 12 and 13. When performing a pull shift operation to pull and move the shift key 75, the pull side inclined portion K1 of the key protrusion 77 receives an operation reaction force from the spacer 98 between the output side gears. When performing a push-shift operation in which the shift key 75 is pressed and moved, as shown in FIGS. 12 and 13, the push-side inclined portion K2 of the key protrusion 77 is operated from the spacer 98 between the output-side gears. It receives reaction force (Z). Regardless of whether a pull shift operation or a push shift operation is performed, the key protrusion side of the shift key 75 moves toward the shift operation shaft 76 due to the operating reaction force received from the spacer 98, as shown by the two-dot chain line in FIG. 7. It swings toward the positioning sphere 96 using the portion supported by it as a swing support point, and by this swing, the positioning spring 97 is elastically deformed toward the compression side while the key protrusion 77 is pulled out of the engaging groove 78. It comes out. When performing a pull shift operation, the contact angle of the pull-side inclined portion K1 with respect to the spacer 98 changes small, and when a push-shift operation is performed, the contact angle of the push-side inclined portion K2 with respect to the spacer 98 changes. This is changing significantly. When performing a push-shift operation, as shown in FIGS. 12 and 13, the first component Zy of the operation reaction force Z received by the push-side inclined portion K2 from the spacer 98 causes the positioning spring 97 to elastically It becomes the operating force that deforms, and the second component Zx of the operating reaction force (Z) becomes the resistance of the shifting operation.

In the shift key 75 shown in FIG. 12, the inclination angle Θ1 of the push-side inclined portion K2 is a gentler inclination angle than the inclination angle Θ of the pull-side inclined portion K1. In the shift key 75 shown in FIG. 13, the inclination angle Θ2 of the push-side inclined portion K2 and the inclination angle Θ of the pull-side inclined portion K1 are equal. 12 and 13, the second component Zx of the operating reaction force Z received by the shift key 75, where the inclination angle of the push-side inclined portion K2 is a gentler angle than the inclination angle of the pulling-side inclined portion K1, is , the inclination angle of the push-side inclined portion K2 and the inclination angle of the pull-side inclined portion K1 are smaller than the second component Zx of the operating reaction force Z received by the same shift key 75.

By setting the inclination angle of the push-side inclined portion K2 of the key protrusion 77 to a gentler inclination angle than the inclination angle of the pull-side incline portion K1, the shift operation resistance received by the shift key 75 during a push-shift operation is reduced to the push-side inclination angle. The inclination angle of the inclined portion K2 and the inclination angle of the pull-side inclined portion K1 become smaller than the shifting operation resistance received by the equivalent shifting key 75, and the shifting operating resistance received during the push shifting operation and the shifting operating resistance received during the pulling shifting operation are reduced. It becomes possible to make the shift operation resistance equal or almost equal, and shift operation can be performed with a good operating feel.

In addition, modes for carrying out the present invention will be described based on the drawings. In addition, in the following description, the direction of arrow F is referred to as “aircraft front side” (see FIGS. 14 and 15), the direction of arrow B is referred to as “aircraft rear side” (see FIGS. 14 and 15), and the direction of arrow L is referred to as “aircraft rear side” (see FIGS. 14 and 15). The direction of arrow R is called “airframe left” (see Figure 15), and the direction of arrow R is called “aircraft right” (see Figure 15).

〔Overall composition of the riding rice transplanter〕

Figures 14 and 15 show a riding-type rice transplanter (corresponding to the “hydraulic work machine” according to the present invention). This riding-type rice transplanter includes a pair of left and right front wheels 1001, a pair of left and right rear wheels 1002, a body frame 1003, an operating unit 1004, and a mother planting device for performing mother planting on the rice field bottom. (1005) (corresponding to the “working device” according to the present invention) is provided. In the front part of the fuselage, engine E, transmission case M, driving HST (1006) (corresponding to the “transmission device” according to the present invention), daytime HST (1007) (corresponding to the “continuously variable transmission device” according to the present invention). 16) is installed. Above the front part of the aircraft, a receiving device 1008 is installed to receive location information from GPS (Global Positioning System) satellites. The operating unit 1004 is equipped with a driver's seat 1009 on which the driver sits and a steering handle 1010 for steering operation.

[Board planting device]

As shown in FIGS. 14 and 15 , the model device 1005 is supported at the rear portion of the body frame 1003 via a link mechanism 1011 so as to be capable of being raised and lowered. In this embodiment, the mother planting device 1005 is configured by an 8-piece mother planting device. However, the number of planting assistants of the mother planting device 1005 is not limited to 8. The seedling planting device 1005 includes a seedling loading table 1012 on which 8 sets of mat-like seedlings are loaded, a planting arm 1013, a feed case (not shown), a planting power transmission case 1014, and a rotation case ( 1015) and a float 1016 are provided.

The rotation case 1015 is rotatably supported on each of the left and right sides of the rear portion of the planting transmission case 1014. The planting arm 1013 takes out the seedlings from the seedling loading stand 1012 and transplants them to the field bottom. The planting arm 1013 is rotatably supported at each of both free ends of the rotary case 1015. When the engine driving force from the feed case is transmitted to the rotation case 1015 through the planting power transmission case 1014, the rotation case 1015 is rotationally driven, and simulated planting by the planting arm 1013 is performed.

[Power transmission configuration]

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

The daytime HST 1007 is a continuously variable transmission device that changes the power from the running HST 1006 and transmits it to the mother unit device 1005, and in this embodiment, is configured as a hydrostatic continuously variable transmission device. Weekly HST 1007 is connected to the right side of mission case M.

The weekly HST 1007 is equipped with a trunnion shaft 1017 that operates an inclined plate (not shown). A drive mechanism 1018 (electric motor, etc.) that rotates the trunnion shaft 1017 and an angle sensor 1019 that detects the rotation angle of the trunnion shaft 1017 are provided.

The transmission case M is equipped with a gear-type auxiliary transmission device (not shown) and a gear-type differential speed transmission device 1020. The uneven speed transmission device 1020 changes the angular speed of the output power with respect to the input power. In the area until the planting arm 1013 takes out the seedlings from the seedling loading stand 1012 and transplants them to the bottom of the field, the rotational speed of the rotation case 1015 is adjusted by the inconstant speed transmission device 1020 to a small, high speed, or You can do it at low speed.

As shown in FIG. 14, the driving force of engine E is transmitted to the driving HST 1006 through the transmission belt 1021. Then, the power shifted by the driving HST 1006 is branched in parallel to the driving transmission system and the working transmission system, and the power of the traveling transmission system is transmitted through the auxiliary transmission device, etc. to the left and right front wheels 1001 and In addition to being transmitted to the left and right rear wheels 1002, the power of the work transmission system is transmitted to the model device 1005 through the weekly HST 1007 and the differential speed shifting device 1020.

〔Control block〕

As shown in FIG. 16, the control block includes a control device 1022, a setting weekly selection operation unit 1023 (corresponding to the “setting interval selection operation unit” according to the present invention), a receiving device 1008, and an angle A sensor 1019, a rear wheel speed sensor 1024 (corresponding to the “wheel speed sensor” according to the present invention), an input speed sensor 1025, and an output speed sensor 1026 are provided.

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

The set week selection operation unit 1023 selects the simulated planting interval S1 (corresponding to the “working interval” according to the present invention) to the rice field bed by the mother planting device 1005 from a plurality of set weeks. In this embodiment, the setting week selection operation unit 1023 is configured by a setting operation screen provided in the operation unit 1004.

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

The shift stage setting unit 1027 sets the shift stage of the weekly HST 1007 according to the set week selected by the set week selection operation unit 1023. The drive mechanism 1018 rotates the trunnion shaft 1017 based on a command from the shift stage setting unit 1027. A plurality of shift stages of the weekly HST 1007 corresponding to each of the plurality of set weeks are set in stages.

The vehicle speed calculation unit 1028 calculates the actual vehicle speed of the aircraft based on the position information received by the reception device 1008. The planting interval adjustment unit 1029 plants plants according to the actual vehicle speed of the aircraft calculated by the vehicle speed calculation unit 1028 so that the actual week matches the set week (the set week selected by the set week selection operation unit 1023). Adjust the gap S1. The drive mechanism 1018 rotates the trunnion shaft 1017 based on a command from the planting interval adjustment unit 1029.

Here, the vehicle speed calculation unit 1028 calculates the actual vehicle speed of the aircraft based on the detected value of the rear wheel speed sensor 1024 when the receiving device 1008 is in a bad condition. At that time, the vehicle speed calculation unit 1028 calculates the actual vehicle speed of the aircraft based on the detected value of the rear wheel speed sensor 1024, taking into account the slip rate of the predetermined wheels. In this embodiment, the design value is used as the slip rate of a predetermined wheel. In addition, when the rear wheel speed sensor 1024 is in a bad condition (the receiving device 1008 and the rear wheel speed sensor 1024 are in a bad condition), the vehicle speed calculation unit 1028 determines the input speed sensor 1025. ) Calculate the actual vehicle speed of the aircraft based on the detected value.

(Other embodiments of the invention)

(1) In the above-described embodiment, an example is shown in which the first continuously variable transmission device 32 and the second continuously variable transmission device 35 are supported on the upper part of the transmission case 30, but this is not limited to this and the transmission case ( It may be performed by supporting it on any part, such as the lower part of 30). Depending on the location where the first continuously variable transmission device 32 and the second continuously variable transmission device 35 are supported, the charge circuit 111 is installed on the upper wall portion 102 of the transmission case 30, as well as on the horizontal wall portion, the bottom wall portion, etc. , it can be installed through a hole in the wall at any location.

(2) In the above-described embodiment, an example has been shown in which the drain circuit 117 is constituted by the groove 118 formed in the transverse wall portion 113 as the second wall portion, but it is not limited to this and includes a rear wall portion, a front wall portion, etc. A groove formed on the wall at any location may be employed.

(3) In the above-described embodiment, an example is shown in which the working part shifting device 70 is configured so that the shifting key 75 acts on the output-side gear 73, but the shifting key 75 acts on the input-side gear 72. A working part shifting device configured to act on may be employed.

(4) In the above-described embodiment, an example has been shown in which the output shaft 39 of the continuously variable transmission 35 for work includes an output shaft main body 39A and an extended output shaft 39B, but the present invention is not limited to this and includes one output shaft. It may be implemented by adopting .

(5) In the above-described embodiment, an example has been described in which the seedling device 20 for supplying seedlings as agricultural materials to the forage is provided, but the present invention is not limited to this. A working device that supplies rice seeds as agricultural materials, liquid or granular chemicals, and liquid or granular fertilizers to the rice field bed may be provided.

(6) In the above-described embodiment, an example in which the engine 4 is provided as a prime mover is shown, but the present invention is not limited to this, and an electric motor may be employed. Additionally, a combination of an engine and an electric motor may be employed.

(7) In the above-described embodiment, an example in which the front wheels 2 and the rear wheels 3 are adopted as the traveling device has been shown, but the present invention is not limited to this, and a crawler traveling device can be adopted. In addition, it is possible to adopt a traveling device that combines wheels and a mini crawler.

(8) In the above-described embodiment, the transmission device 32 for driving and work has been shown as an example configured by a hydrostatic continuously variable transmission device, but it is not limited to this and may be configured by a gear-type transmission device. Additionally, it may be configured as a continuously variable transmission device that combines a belt-type continuously variable transmission device and a forward/backward switching device.

(9) In the above-described embodiment, the continuously variable transmission device 35 for work has been shown as an example configured by a hydrostatic continuously variable transmission device, but it is not limited to this and may be configured by a belt-type continuously variable transmission device.

(10) In the above-described embodiment, the “hydraulic work machine” according to the present invention was a riding-type rice transplanter. However, instead of this, the “faucet work machine” according to the present invention may be used. In this case, the seeding machine includes a seeding device (corresponding to the “working device” according to the present invention) for seeding the rice field bottom, and a continuously variable transmission device for shifting the power from the traveling HST 1006 and transmitting it to the seeding device. and a setting interval selection operation unit that selects and operates a seeding interval for the rice field bed by the seeding device from a plurality of setting intervals, and a shift stage setting unit (1027) that sets a shift stage of the continuously variable transmission device according to the selected setting interval. ) is provided.

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

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

(13) In the above embodiment, the driving HST 1006 is configured by a hydrostatic continuously variable transmission. However, instead of this, the “transmission device” according to the present invention may be configured by a transmission device (for example, a gear-type transmission device) other than a hydrostatic continuously variable transmission device.

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

(15) In the above embodiment, when a tooth of the detection gear detected by the rear wheel rotation speed sensor 1024 is missing, the rotation speed of the rear wheel 1002 is detected based on the rotation (pulse signal) tendency of the detection gear. You can do it.

(16) In the above embodiment, when the rear wheel speed sensor 1024 is not in good condition, the input speed sensor 1025 is used as a replacement means. Conversely, if the input speed sensor 1025 is not in good condition, the rear wheel speed sensor 1024 may be used as an alternative. For example, when the input speed sensor 1025 is in a bad condition (the receiving device 1008 and the input speed sensor 1025 are in a bad condition), the vehicle speed calculation unit 1028 operates the rear wheel speed sensor. The actual vehicle speed of the aircraft may be calculated based on the detected value of (1024).

(17) In the above embodiment, the position of the sub-shift lever for shifting the sub-transmission device is detected, and based on the position of the sub-shift lever, the detection value and the input rotation speed of the rear wheel speed sensor 1024 are detected. The detected value of the sensor 1025 can also be converted. In addition, the detection value of the rear wheel speed sensor 1024 and the detection value of the input speed sensor 1025 are compared, and the detection value of the rear wheel speed sensor 1024 and the detection value of the input speed sensor 1025 are compared. Based on the results, the position of the secondary shift lever may be determined.

In addition, the present invention is not limited to the above-mentioned embodiment and the above-mentioned other embodiments, and various other changes are possible.

In addition to riding-type rice transplanters, the present invention can be applied to work machines that supply agricultural materials such as seeds, fertilizers and chemicals to cotton, such as riding-type seeders.

In addition, the present invention can be used not only for riding-type rice transplanters but also for seeding machines.

2: First drive target device (travel device/front wheels)
3: First drive target device (travel device/rear wheels)
4: Prime mover (engine)
11: Agricultural material supply department (seedling loading stand)
20: Second drive target device (working device, mother planting device)
22: Work department (mother planting mechanism)
30: Mission Case
30A: Case body
30B: Case cover part
31: Travel device drive case portion (front-wheel drive case portion)
32: first continuously variable transmission
35: second continuously variable transmission
37: Branch portion (branch axis)
39: output shaft
39A: Output shaft body
39B: Extended output shaft
60: Deceleration mechanism
61: Electric barrel shaft
70: Working part shifting device
72: Input side member (input side gear)
90: Working part clutch
S: Powertrain
X: Drivetrain
Y: Drivetrain for work
102: Part of the wall (upper wall)
104: Oil supply circuit
109: drain port
110: charge port
111: charge circuit
113: Second wall portion (transverse wall portion)
117: drain circuit
118: Home
119: cover member
1005: Mother planting device (working device)
1006: HST (transmission device) for driving
1007: Weekly HST (Continuously Variable Transmission)
1008: Receiving device
1023: Setting weekly selection control panel (Setting interval selection control panel)
1024: Rear wheel speed sensor (wheel speed sensor)
1025: Input rotation speed sensor
1027: Shift stage setting unit
1028: Vehicle speed calculation unit
1029: Planting interval adjustment unit (working interval adjustment unit)
S1: Planting interval (work interval)

Claims (22)

A first hydrostatic continuously variable transmission device that outputs output toward a first drive target device and a second hydrostatic continuously variable transmission device that outputs output toward a second drive target device are provided;
A hydraulic pump separate from the first continuously variable transmission device is installed outside the input side of the first continuously variable transmission device, and is connected to a drain port of the first continuously variable transmission device and a charge port of the second continuously variable transmission device, A charge circuit is provided to supply exhaust oil discharged from the first continuously variable transmission device as hydraulic oil to the second continuously variable transmission device by the discharge pressure of the first continuously variable transmission device, and is provided on the outside of the input side of the second continuously variable transmission device. A work machine in which a hydraulic pump separate from the second continuously variable transmission device is not installed. The method of claim 1, wherein a transmission case is provided to support the first continuously variable transmission device and the second continuously variable transmission device,
A work machine in which the charge circuit is drilled into a wall of the transmission case. The method of claim 2, wherein the first continuously variable transmission device and the second continuously variable transmission device are supported on an upper part of the transmission case,
The work machine wherein the charge circuit passes through a portion of the wall portion located at an upper part of the transmission case. The device according to claim 2 or 3, comprising: a traveling device drive case portion extending and protruding from the transmission case;
an oil supply circuit that extracts lubricating oil from the transmission case and supplies the extracted lubricating oil to the first continuously variable transmission as operating oil;
A work machine provided with a drain circuit that discharges exhaust oil from the second continuously variable transmission device to the traveling device drive case portion. The work tool according to claim 4, wherein the drain circuit is comprised of a groove formed on an inner surface of the second wall portion of the transmission case, and a cover member provided on the inner surface and closing an opening of the groove. The method according to any one of claims 1 to 3, wherein the first driven device is a traveling device,
A work machine in which the second drive target device is a work device that supplies agricultural materials to packaging. The method of claim 6, wherein the shifting power output from the first continuously variable transmission device is branched into driving power and work power, the branched driving power is transmitted to the traveling device, and the branched work power is transmitted to the second continuously variable transmission device. A work machine transmitted to the work device through a transmission device. The working machine according to claim 7, wherein the working device is a seedling device for supplying seedlings as agricultural materials to packaging. delete delete delete delete delete delete delete delete delete delete delete delete delete delete