Sugar cane harvester

Abstract

To provide a sugar cane harvester that can reduce hydraulic paths for supplying work fluid to a hydraulic motor which drives right and left dividers and a hydraulic motor which drives a cutting device.SOLUTION: A sugar cane harvester includes: a right and left separation hydraulic motors 23-26 which drive right and left dividers 13-16 for rotation; and cutting hydraulic motors 21, 22 which drive cutting devices 11, 12. The sugar cane harvester includes: a first supply oil path 31 to supply work fluid in the hydraulic pump 29 to the cutting hydraulic motors 21, 22; a second supply oil path 32 to supply the work fluid discharged from the cutting hydraulic motors 21, 22 to the branch part 46; a right third supply oil path 33 to supply work fluid in one of two routes from a branch part 46 to right separation hydraulic motors 23, 24; and a left third supply oil path 43 tor supply work fluid in the other one of the two routes from the branch part 46 to left separation hydraulic motors 25, 26.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to the configuration of a cutting unit in a sugarcane harvester. [Background technology]

[0002] As disclosed in Patent Document 1, some sugarcane harvesters have right and left dividers and a cutting device provided in the reaping section. The dividers are driven to rotate around an axis that runs vertically, separating the crops in the field into the crop to be harvested and other crops, and the crops to be harvested are guided between the right and left dividers. The bases of the crops guided between the right and left dividers are cut by the cutting device, and the crops are harvested. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-40561 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the right and left dividers and cutting devices are each provided with a hydraulic motor, and the right and left dividers and cutting devices are driven by the hydraulic motors. This requires the provision of many oil passages to supply hydraulic oil to the hydraulic motors, so there is a demand for reducing the number of oil passages.

[0005] The present invention aims to provide a sugarcane harvester that is configured to reduce the number of oil passages that supply hydraulic oil to the hydraulic motors that drive the right and left dividers and the hydraulic motor that drives the cutting device. [Means for solving the problem]

[0006] The sugarcane harvester of the present invention is provided with right and left dividers that are rotated around an axis that runs vertically to separate crops in a field into crops to be harvested and other crops, a cutting device that is placed between the right and left dividers and that cuts the base of the crops that have been guided as crops to be harvested, a right separation hydraulic motor that rotates the right divider, a left separation hydraulic motor that rotates the left divider, a cutting hydraulic motor that drives the cutting device, a hydraulic pump, and a branching unit that branches supplied hydraulic oil into two systems, and is provided with a first supply oil passage that supplies hydraulic oil from the hydraulic pump to the cutting hydraulic motor, a second supply oil passage that supplies hydraulic oil from the cutting hydraulic motor to the branching unit, a right third supply oil passage that supplies hydraulic oil from one of the two systems of the branching unit to the right separation hydraulic motor, and a left third supply oil passage that supplies hydraulic oil from the other of the two systems of the branching unit to the left separation hydraulic motor.

[0007] According to the present invention, hydraulic oil from the hydraulic pump is supplied to the cutting hydraulic motor through the first oil supply passage, and the cutting device is driven by the cutting hydraulic motor. Hydraulic oil discharged from the cutting hydraulic motor is supplied to the branch section through the second oil supply passage, and is branched into two systems at the branch section. The hydraulic oil from one of the two systems in the branch section is supplied to the right separation hydraulic motor through the right third oil supply passage, and the right divider is rotated by the right separation hydraulic motor. The hydraulic oil from the other of the two systems in the branch section is supplied to the left separation hydraulic motor through the left third oil supply passage, and the left divider is rotated by the left separation hydraulic motor.

[0008] According to the present invention, the first supply oil passage, the cutting hydraulic motor, and the branching portion are provided in series in this order, and the third supply oil passages are provided in parallel on the right and left sides of the branching portion. This allows the number of supply oil passages to be reduced compared to a configuration in which supply oil passages are provided in parallel from the hydraulic pump to all of the cutting hydraulic motor, right separation hydraulic motor, and left separation hydraulic motor, making it easier to arrange the supply oil passages and simplifying the supply system for hydraulic oil to the cutting hydraulic motor, right and left separation hydraulic motors.

[0009] In sugarcane harvesters, the cutting device cuts the base of the crop in the field, so a larger load is placed on the cutting device than on the divider. Therefore, the cutting hydraulic motor is configured to output a large driving force to drive the cutting device by being supplied with hydraulic oil at a high pressure and a large flow rate.

[0010] According to the present invention, the hydraulic oil from the hydraulic pump is supplied to the cutting hydraulic motor before the separation hydraulic motor, so that high-pressure, large-flow hydraulic oil is supplied to the cutting hydraulic motor, and the cutting hydraulic motor outputs a large driving force to drive the cutting device. As a result, the cutting device can be smoothly driven by the cutting hydraulic motor against a large load, so that the base of crops in the field can be smoothly cut, thereby improving crop harvesting performance.

[0011] In a sugarcane harvester, the load on the divider is smaller than that on the cutting device. According to the present invention, the hydraulic oil coming out of the cutting hydraulic motor is diverted by the diverter, so that even if hydraulic oil that is not high pressure and does not have a large flow rate is supplied to the right and left separation hydraulic motors, the right and left separation hydraulic motors operate without any hindrance and rotate the right and left dividers.

[0012] In the present invention, it is preferable that the flow dividing section is a flow divider valve that divides the hydraulic oil discharged from the cutting hydraulic motor equally into the right third supply oil passage and the left third supply oil passage.

[0013] According to the present invention, the hydraulic oil coming out of the cutting hydraulic motor is equally divided by the flow divider (flow divider valve) and supplied to the right and left separated hydraulic motors. Therefore, even if there is a difference in the load on the right and left dividers, the right and left separated hydraulic motors operate at the same speed, and the right and left dividers are rotated at the same speed. This ensures that the separation of the crop to be harvested from other crops is carried out in the same way at the right and left dividers, and the crop to be harvested is guided between the right and left dividers, which is advantageous in terms of improving crop cutting performance.

[0014] In the present invention, it is preferable that the divider has a first divider on the side closer to the cutting device in the left-right direction and a second divider on the side farther from the cutting device in the left-right direction, the separation hydraulic motor has a first separation hydraulic motor that rotates the first divider and a second separation hydraulic motor that rotates the second divider, the third supply oil passage is connected to the first separation hydraulic motor, and the hydraulic oil from the first separation hydraulic motor is supplied to the second separation hydraulic motor.

[0015] In a sugarcane harvester, a first divider is provided on the right and left dividers, respectively, closer to the cutting device in the left-right direction, and a second divider is provided on the left-right side farther from the cutting device in the left-right direction. The first divider is directly involved in guiding the harvested crop between the right and left dividers, and therefore is subjected to a greater load than the second divider.

[0016] According to the present invention, hydraulic oil in the divided section is supplied to the first separation hydraulic motor through the third oil supply passage, and the first divider is rotationally driven by the first separation hydraulic motor. Hydraulic oil from the first separation hydraulic motor is supplied to the second separation hydraulic motor, and the second divider is rotationally driven by the second separation hydraulic motor.

[0017] As a result, the first separation hydraulic motor and the second separation hydraulic motor are arranged in series in order, so the number of supply oil passages can be reduced compared to a configuration in which a third supply oil passage is arranged in parallel to the first separation hydraulic motor and the second separation hydraulic motor, which is advantageous in terms of simplifying the supply system for hydraulic oil to the cutting hydraulic motor and the right and left separation hydraulic motors.

[0018] According to the present invention, the hydraulic oil in the branch section is supplied to the first separation hydraulic motor before the second separation hydraulic motor, so that relatively high-pressure hydraulic oil is supplied to the first separation hydraulic motor, and the first separation hydraulic motor outputs a relatively large driving force to rotate the first divider. As a result, the first divider can be smoothly driven by the first separate hydraulic motor against a large load, and the crops to be harvested can be smoothly guided between the right and left dividers.

[0019] According to the present invention, hydraulic oil from the first separation hydraulic motor is supplied to the second separation hydraulic motor. Since the load on the second divider is smaller than that on the first divider, the second separation hydraulic motor can smoothly rotate the second divider without using high-pressure hydraulic oil.

[0020] According to the present invention, by positioning the first and second separation hydraulic motors in accordance with the operating states of the first and second dividers, the first and second separation hydraulic motors can be operated appropriately, which is advantageous in terms of improving crop cutting performance.

[0021] In the present invention, it is preferable that a divider operation valve be provided in the second supply oil passage and operable between a supply position where the hydraulic oil from the cutting hydraulic motor is supplied to the diverter section and a discharge position where the hydraulic oil from the cutting hydraulic motor is discharged without being supplied to the diverter section.

[0022] In sugarcane harvesters, crops can get tangled around the rotating dividers, which can cause work to be interrupted. According to the present invention, when the divider operating valve is operated to the supply position, the hydraulic oil from the disconnection hydraulic motor is supplied to the diverter section through the second supply oil passage and the divider operating valve, and then supplied from the diverter section to the separation hydraulic motor, thereby rotating the divider.

[0023] If there is a possibility that the crop may get tangled around the divider, or if the crop has already gotten tangled around the divider, the divider operating valve can be operated to the discharge position. When the divider operating valve is operated to the discharge position, the hydraulic oil from the cutting hydraulic motor is discharged without being supplied to the diverter, and the separating hydraulic motor and the divider are stopped. This prevents the crop from getting tangled around the divider, and the crop that has gotten tangled around the divider can be removed. When the divider operating valve is operated to the discharge position, the hydraulic oil from the cutting hydraulic motor is discharged rather than shut off, so back pressure does not build up in the divider operating valve and the cutting hydraulic motor operates without any hindrance.

[0024] This reduces interruptions to work caused by crops getting wrapped around the divider, and the cutting hydraulic motor continues to operate without any problems even when the divider operating valve is operated to the discharge position, thereby improving work efficiency.

[0025] In the present invention, it is preferable that a lodging device is provided forward of the cutting device and for lodging forward the crop guided between the right and left dividers, and a lodging hydraulic motor is provided for driving the lodging device, and that a fourth oil supply passage is provided for supplying hydraulic oil from the cutting hydraulic motor to the lodging hydraulic motor.

[0026] In sugarcane harvesters, a lodging device that locate the crop guided between the right and left dividers may be provided ahead of the cutting device, and the lodging device is driven by a hydraulic lodging motor.

[0027] According to the present invention, in addition to the hydraulic oil from the cutting hydraulic motor being supplied to the right and left separated hydraulic motors, the hydraulic oil from the cutting hydraulic motor is also supplied to the down-setting hydraulic motor through the fourth oil supply passage.

[0028] Since the load on the tilting device is smaller than that on the cutting device, the tilting hydraulic motor can drive the tilting device without using high-pressure hydraulic oil or a large flow rate of hydraulic oil. As a result, even in a configuration in which non-high pressure hydraulic oil coming from the cutting hydraulic motor is supplied to the lowering hydraulic motor, the lowering hydraulic motor operates without any hindrance and the lowering device is driven.

[0029] In the present invention, it is preferable that the cutting hydraulic motor has a first cutting hydraulic motor and a second cutting hydraulic motor, the first supply oil passage branches off and is connected in parallel to the first cutting hydraulic motor and the second cutting hydraulic motor, the second supply oil passage supplies the hydraulic oil from the first cutting hydraulic motor to the branch section, and the fourth supply oil passage supplies the hydraulic oil from the second cutting hydraulic motor to the tilting hydraulic motor.

[0030] According to the present invention, a first cutting hydraulic motor and a second cutting hydraulic motor are provided, a first supply oil passage branches off and is connected in parallel to the first cutting hydraulic motor and the second cutting hydraulic motor, and the cutting device is driven by the first cutting hydraulic motor and the second cutting hydraulic motor. Since the first cutting hydraulic motor and the second cutting hydraulic motor drive the same cutting device, the same load is applied to the first cutting hydraulic motor and the second cutting hydraulic motor. Therefore, even if the first supply oil passage branches and is connected in parallel to the first cutting hydraulic motor and the second cutting hydraulic motor, approximately the same flow rate of hydraulic oil is supplied to the first cutting hydraulic motor and the second cutting hydraulic motor.

[0031] According to the present invention, hydraulic oil from the first disconnection hydraulic motor is supplied to the right and left separated hydraulic motors through the second supply oil passage and the branch section, and hydraulic oil from the second disconnection hydraulic motor is supplied to the down-setting hydraulic motor through the fourth supply oil passage. By supplying hydraulic oil at approximately the same flow rate to the first cutting hydraulic motor and the second cutting hydraulic motor, hydraulic oil is supplied at approximately the same flow rate to the right and left separation hydraulic motors and the tilting hydraulic motor. This allows the right and left separated hydraulic motors and the lowering hydraulic motor to operate without any hindrance, which is advantageous in terms of improving crop harvesting performance.

[0032] In the present invention, it is preferable that a disconnection reverse oil passage connected to a portion from which hydraulic oil in the disconnection hydraulic motor comes out, and a separation reverse oil passage connected to a portion from which hydraulic oil in the separation hydraulic motor comes out are provided, and that an operation valve is provided that can be operated between a forward rotation position where hydraulic oil of the hydraulic pump is supplied to the first supply oil passage and a reverse position where hydraulic oil of the hydraulic pump is supplied to the disconnection reverse oil passage and the separation reverse oil passage.

[0033] According to the present invention, during normal operation, the operating valve is operated to the normal rotation position. When the operating valve is operated to the normal rotation position, hydraulic oil from the hydraulic pump is supplied from the operating valve to the first supply oil passage, and the cutting hydraulic motor and the separation hydraulic motor operate in the normal rotation direction.

[0034] In sugarcane harvesters, crop or field soil can sometimes get stuck in the dividers and cutting equipment, causing the harvester to stop operation. When this occurs, the operating valve can be operated to the reverse position.

[0035] When the operating valve is operated to the reverse position, hydraulic oil from the hydraulic pump is supplied through the cutoff reverse oil passage to a portion of the cutoff hydraulic motor from which hydraulic oil is discharged, causing the cutoff hydraulic motor to operate in reverse. The hydraulic oil of the hydraulic pump is supplied to the part of the separated hydraulic motor from which the hydraulic oil exits through the separated reverse oil passage, and the separated hydraulic motor operates in the reverse direction. This can eliminate blockages in the divider and cutting device.

[0036] In the present invention, it is preferable that a separated reverse oil passage connected to a portion from which hydraulic oil in the separated hydraulic motor comes out, and a tilting reverse oil passage connected to a portion from which hydraulic oil in the tilting hydraulic motor comes out are provided, and that an operation valve is provided that can be operated between a forward rotation position where hydraulic oil of the hydraulic pump is supplied to the first supply oil passage and a reverse position where hydraulic oil of the hydraulic pump is supplied to the separated reverse oil passage and the tilting reverse oil passage.

[0037] According to the present invention, during normal operation, the operating valve is operated to the normal rotation position. When the operating valve is operated to the normal rotation position, hydraulic oil from the hydraulic pump is supplied from the operating valve to the first supply oil passage, and the cutting hydraulic motor, the separation hydraulic motor, and the tilting hydraulic motor operate in the normal direction.

[0038] In sugarcane harvesters, crop or field soil can get stuck in the dividers, cutting devices, or tipping devices, causing the harvester to stop operation. When this happens, the operating valve can be operated to the reverse position.

[0039] When the operating valve is operated to the reverse position, hydraulic oil from the hydraulic pump is supplied to the tilting hydraulic motor through the tilting reverse oil passage, causing the tilting hydraulic motor to operate in reverse. The hydraulic oil coming out of the tilting hydraulic motor flows backward through the fourth supply oil passage and is supplied to the part of the cutting hydraulic motor from which the hydraulic oil comes out, causing the cutting hydraulic motor to operate in the reverse direction. The hydraulic oil of the hydraulic pump is supplied to the part of the separated hydraulic motor from which the hydraulic oil exits through the separated reverse oil passage, and the separated hydraulic motor operates in the reverse direction. This can eliminate blockages in the divider, cutting device, and tipping device.

[0040] In the present invention, it is preferable to include a clogging detection unit that detects clogging of crops, and a control unit that operates the operating valve to the reverse position based on the detection of clogging by the clogging detection unit.

[0041] According to the present invention, the control unit automatically operates the operating valve to the reverse position based on the detection of a blockage by the blockage detection unit, which is advantageous in terms of improving operability and improving work efficiency.

[0042] In the present invention, it is preferable that the control unit operates the operation valve to the forward rotation position when a preset time has elapsed since the control unit operated the operation valve to the reverse rotation position.

[0043] According to the present invention, when a set time has elapsed since the control unit automatically operated the operating valve to the reverse position, the control unit automatically operates the operating valve to the forward position, so that normal operation can be easily resumed, which is advantageous in terms of improving work efficiency. [Brief explanation of the drawings]

[0044] [Figure 1] FIG. 2 is a left side view of the sugarcane harvester. [Figure 2] FIG. [Figure 3] FIG. 2 is a schematic diagram showing a hydraulic circuit of the reaping unit. DETAILED DESCRIPTION OF THE INVENTION

[0045] Figures 1 to 3 show a sugarcane harvester, and in Figures 1 to 3, F indicates the forward direction, B indicates the backward direction, U indicates the upward direction, D indicates the downward direction, R indicates the rightward direction, and L indicates the leftward direction.

[0046] (Overall configuration of sugarcane harvester) As shown in Figure 1, the reaping unit 3 and the first conveying device 4 are connected to form the machine body 10, and the first conveying device 4 extends diagonally upward and rearward from the rear of the reaping unit 3.

[0047] Right and left front wheels 1 are provided on the right and left parts of the reaping unit 3. An upper cutting device 7 is provided on the top of the reaping unit 3 and is positioned above and in front of the reaping unit 3. Right and left rear wheels 2 are provided on the lower part of the rear part of the first conveying device 4, and the machine body 10 is supported by the front wheels 1 and rear wheels 2.

[0048] The sorting device 5 is provided in the vertical direction at the rear of the first conveying device 4, and the second conveying device 6 extends diagonally upward from the bottom of the sorting device 5. An engine 8 is provided at the top of the front of the first conveying device 4, and a driving unit 9 is provided at the top of the reaping unit 3.

[0049] (Configuration of reaping unit 3) As shown in Figures 1 and 2, the reaping section 3 has right and left cutters 11, 12 (corresponding to cutting devices), a right first divider 13 (corresponding to a divider), a right second divider 14 (corresponding to a divider), a left first divider 15 (corresponding to a divider), a left second divider 16 (corresponding to a divider), tipping rollers 17, 18 (corresponding to tipping devices), and right and left side wall sections 19.

[0050] Right and left side wall portions 19 are provided along the front-to-rear direction, and the rear portions of the side wall portions 19 are connected to the front portion of the first conveying device 4. Right and left front wheels 1 are provided on the right and left side wall portions 19. Tipping rollers 17, 18 are provided at the upper front portions between the right and left side wall portions 19, and are driven to rotate around axes P7, P8 that extend along the left-to-right direction.

[0051] The right and left cutters 11, 12 are configured by attaching multiple cutting blades to the outer periphery of a disk member, and are arranged side by side in the left-right direction at the bottom of the rear part between the right and left side wall parts 19. The cutters 11, 12 are driven to rotate around axes P1, P2 that extend in the up-down direction.

[0052] The right first divider 13 and the right second divider 14 are provided in front of the right lateral wall portion 19. The right first divider 13 and the right second divider 14 are driven to rotate around axes P3 and P4 (corresponding to axes along the up-down direction) along the longitudinal direction of the first divider 13 (second divider 14).

[0053] The left first divider 15 and the left second divider 16 are provided in front of the left lateral wall portion 19. The left first divider 15 and the left second divider 16 are driven to rotate around axes P5 and P6 (corresponding to axes along the up-down direction) along the longitudinal direction of the first divider 15 (second divider 16).

[0054] (Positional relationship of each part in the reaping unit 3) 1 and 2, the cutters 11 and 12 are provided at the lower rear portion between the right and left side wall portions 19. The tilting roller 17 is provided in front of the cutters 11 and 12 in plan and side views, and is provided at a higher position than the cutters 11 and 12. The tilting roller 18 is provided in front of the tilting roller 17 in plan and side views, and is provided at a higher position than the tilting roller 17.

[0055] The right first divider 13 is provided in a rearwardly inclined position in front of the right lateral wall 19, and is provided in front of the tipping rollers 17, 18. The right second divider 14 is provided in a rearwardly inclined position in front of the right lateral wall 19, and is provided in front of the tipping rollers 17, 18, at a position outward to the right of the right first divider 13.

[0056] The left first divider 15 is provided in a rearwardly inclined position in front of the left lateral wall portion 19, and is provided forward of the tipping rollers 17, 18. The left second divider 16 is provided in a rearwardly inclined position in front of the left lateral wall portion 19, and is provided forward of the tipping rollers 17, 18, at a position laterally outward to the left of the left first divider 15.

[0057] In a plan view, the right and left first dividers 13, 15 are located closer to the left-right center of the cutting section 3 than the right and left second dividers 14, 16, and are located closer to the cutters 11, 12 in the left-right direction than the right and left second dividers 14, 16.

[0058] In a plan view, the right and left second dividers 14, 16 are located farther from the left-right center of the cutting section 3 than the right and left first dividers 13, 15, and are located farther from the cutters 11, 12 in the left-right direction than the right and left first dividers 13, 15.

[0059] In a side view, the lower portions of the right and left first dividers 13, 15 are located forward of the lower portions of the right and left second dividers 14, 16. In a side view, the upper portions of the right and left first dividers 13, 15 are located rearward of the upper portions of the right and left second dividers 14, 16.

[0060] (Sugarcane harvester in operation) As shown in Figures 1 and 2, as the machine body 10 moves forward, the upper leaves of the crops in the field are cut by the upper cutting device 7, and the crops in the field are separated into crops to be harvested and other crops by the right first divider 13 and the right second divider 14, and the left first divider 15 and the left second divider 16, and the crops to be harvested are guided between the right and left first dividers 13, 15.

[0061] The crops guided between the right and left first dividers 13, 15 (right and left second dividers 14, 16) are guided forward by the tipping rollers 17, 18 and between the right and left side wall portions 19, and the base of the crops is cut by the cutters 11, 12.

[0062] The crops with their bases cut are supplied from the base to the first conveying device 4, transported diagonally upward and rearward along the first conveying device 4, cut to a predetermined length at the rear end of the first conveying device 4, and then supplied to the top of the sorting device 5.

[0063] The crops supplied to the top of the sorting device 5 fall into the front part of the second conveying device 6. A sorting fan (not shown) is provided at the top of the sorting device 5, and the sorting fan generates sorting wind directed upward inside the sorting device 5. Inside the sorting device 5, the crops fall into the front part of the second conveying device 6 below, and impurities are separated from the crops by the sorting wind and discharged from the top of the sorting device 5.

[0064] The crops that fall onto the front of the second conveying device 6 are transported diagonally upward by the second conveying device 6. A transport vehicle (not shown) accompanies the sugarcane harvester, and the crops are dumped from the rear of the second conveying device 6 onto the loading platform of the transport vehicle.

[0065] (Overview of hydraulic systems in sugarcane harvesters) 3, drive case 20 is attached to engine 8, and hydraulic pumps 29, 30, 34, 35, 36, 37, 38, and 39 are provided in drive case 20. Power from engine 8 is transmitted to hydraulic pumps 29, 30, 34-39 via a gear transmission system inside drive case 20, driving hydraulic pumps 29, 30, 34-39.

[0066] As will be described later, hydraulic oil is supplied from the hydraulic pump 29 to the reaping unit 3, causing the reaping unit 3 to operate. Hydraulic oil is supplied from the hydraulic pump 30 to the first conveying device 4, causing the first conveying device 4 to operate. Hydraulic oil is supplied from the hydraulic pump 34 to the sorting device 5, causing the sorting fan of the sorting device 5 to operate.

[0067] A steering device (not shown) is provided to steer the front wheels 1, and the front wheels 1 are steered by the steering device when a control handle (not shown) provided on the driver's section 9 is operated. Hydraulic oil is supplied from a hydraulic pump 35 to the upper cutting device 7 and the steering device, causing the upper cutting device 7 and the steering device to operate.

[0068] A blower fan (not shown) is provided to supply cooling air to a radiator (not shown) and an oil cooler (not shown). Hydraulic oil is supplied from a hydraulic pump 36 to the blower fan, causing the blower fan to operate.

[0069] A number of hydraulic cylinders (not shown) are provided to perform lifting and lowering operations and direction change operations for the second transfer device 6, etc., and a control valve unit (not shown) is provided to supply and discharge hydraulic oil to the hydraulic cylinders, and hydraulic oil from a hydraulic pump 38 is supplied to the control valve unit. Hydraulic oil is supplied from the hydraulic pump 37 to the second transfer device 6, causing the second transfer device 6 to operate.

[0070] A hydrostatic continuously variable transmission (not shown) is provided. The continuously variable transmission has a travel pump 40, a travel motor (not shown), and a charge pump 41. The travel pump 40 and the charge pump 41 are provided in the drive case 20 and are driven by the power of the engine 8.

[0071] A travel motor is provided in a transmission case (not shown) on which the rear wheels 2 (see Figure 1) are mounted, and hydraulic oil from the travel pump 40 is supplied to the travel motor, causing the travel motor to operate and drive the rear wheels 2. The hydraulic pump 39 circulates the lubricating oil for the drive case 20 and the transmission case through the oil cooler, thereby cooling the lubricating oil for the drive case 20 and the transmission case.

[0072] (Configuration of the drive system of each part of the reaping unit 3) 3, a hydraulic motor 21 (corresponding to a first cutting hydraulic motor) (corresponding to a cutting hydraulic motor) and a hydraulic motor 22 (corresponding to a second cutting hydraulic motor) (corresponding to a cutting hydraulic motor) are provided above the cutters 11, 12. The output shaft of the hydraulic motor 21 and the output shaft of the hydraulic motor 22 are connected, and the hydraulic motors 21, 22 rotate integrally.

[0073] The transmission gear 42a of the common output shaft 42 of the hydraulic motors 21, 22 is engaged with the input gear 11a of the cutter 11. The transmission gear 42a of the common output shaft 42 of the hydraulic motors 21, 22 is engaged with the input gear 12a of the cutter 12 via a relay gear 45.

[0074] The cutter 11 is rotated counterclockwise in Figures 2 and 3 by the hydraulic motors 21 and 22, and the cutter 12 is rotated clockwise in Figures 2 and 3. The base of the crop is cut between the cutters 11 and 12 and supplied to the first conveying device 4.

[0075] As shown in Figures 2 and 3, a hydraulic motor 23 (corresponding to the right first separation hydraulic motor) (corresponding to the right separation hydraulic motor) is provided on the top of the right first divider 13, and the right first divider 13 is rotated by the hydraulic motor 23.

[0076] A hydraulic motor 24 (corresponding to the right second separation hydraulic motor) (corresponding to the right separation hydraulic motor) is provided on the upper part of the right second divider 14, and the right second divider 14 is rotated by the hydraulic motor 24.

[0077] A hydraulic motor 25 (corresponding to the left first separation hydraulic motor) (corresponding to the left separation hydraulic motor) is provided above the left first divider 15, and the left first divider 15 is driven to rotate by the hydraulic motor 25.

[0078] A hydraulic motor 26 (corresponding to the left second separation hydraulic motor) (corresponding to the left separation hydraulic motor) is provided above the left second divider 16, and the left second divider 16 is driven to rotate by the hydraulic motor 26.

[0079] A hydraulic motor 27 (corresponding to a lowering hydraulic motor) is provided on the right side wall portion 19, and the lowering roller 17 is driven to rotate by the hydraulic motor 27. A hydraulic motor 28 (corresponding to a lowering hydraulic motor) is provided on the right side wall portion 19, and the lowering roller 18 is driven to rotate by the hydraulic motor 28.

[0080] (Configuration of hydraulic circuit of reaping unit 3)-1 As shown in FIG. 3, an oil passage 31 (corresponding to a first oil supply passage) extends from the hydraulic pump 29, branches off, and is connected to the hydraulic motor 21 and the hydraulic motor 22. As described above, the output shaft of hydraulic motor 21 and the output shaft of hydraulic motor 22 are connected, and hydraulic motors 21 and 22 rotate integrally. Therefore, even if a flow divider valve 46 (described later) is not provided in oil passage 31, the hydraulic oil in oil passage 31 is supplied evenly to hydraulic motors 21 and 22.

[0081] A flow divider valve 46 (corresponding to a flow dividing portion) is provided. An oil passage 32 (corresponding to a second supply oil passage) (corresponding to a disconnection / reverse oil passage) extends from a portion from which hydraulic oil in the hydraulic motor 21 comes out and is connected to the flow divider valve 46.

[0082] An oil passage 33 (corresponding to the third oil supply passage on the right) extends from the flow divider valve 46 and is connected to the hydraulic motor 23 , and is connected to the hydraulic motor 24 from the portion of the hydraulic motor 23 from which the hydraulic oil comes out.

[0083] An oil passage 43 (corresponding to the third oil supply passage on the left) extends from the flow divider valve 46 and is connected to the hydraulic motor 25, and is connected to the hydraulic motor 26 from the portion of the hydraulic motor 25 from which the hydraulic oil comes out. The flow divider valve 46 divides the hydraulic oil in the oil passage 32 equally into the oil passages 33 and 43 .

[0084] An oil passage 44 (corresponding to the fourth supply oil passage) (corresponding to the disconnection / reverse oil passage) extends from the part where the hydraulic oil comes out of the hydraulic motor 22 and is connected to the hydraulic motor 27, and is connected to the hydraulic motor 28 from the part where the hydraulic oil comes out of the hydraulic motor 27.

[0085] (Configuration of hydraulic circuit of reaping unit 3)-2 3, an electromagnetically operated operating valve 47 is provided in the oil passage 31. The operating valve 47 has a normal rotation position 47a, a reverse rotation position 47b, and a neutral position 47c.

[0086] An oil passage 48 extends from the operating valve 47. An oil passage 49 (corresponding to a separate reverse oil passage) branches off from the oil passage 48, extends, and is connected to a portion of the hydraulic motor 24 from which hydraulic oil exits. An oil passage 50 (corresponding to a separate reverse oil passage) branches off from the oil passage 48, extends, and is connected to a portion of the hydraulic motor 26 from which hydraulic oil exits. An oil passage 51 (corresponding to a tilt-down reverse oil passage) branches off from the oil passages 48, 49, and is connected to a portion of the hydraulic motor 28 from which hydraulic oil exits.

[0087] A switching valve 52 (corresponding to a divider operating valve) is provided in the oil passage 32. The switching valve 52 has a supply position 52a and a discharge position 52b, and is operated by an operating lever 53 that is manually operated.

[0088] (Hydraulic oil supply status in reaping unit 3)-1 The state shown in Figure 3 is a state in which the switching valve 52 is operated to the supply position 52a and the operating valve 47 is operated to the neutral position 47c, in which the hydraulic oil of the hydraulic pump 29 is not supplied to the hydraulic motors 21 to 28 and the cutting unit 3 is stopped.

[0089] In the state shown in Figure 3, when the operating valve 47 is operated to the normal rotation position 47a, the hydraulic oil of the hydraulic pump 29 passes through the oil passage 31 and the operating valve 47 (normal rotation position 47a) and is supplied to the hydraulic motors 21, 22, and the hydraulic motors 21, 22 rotate the cutters 11, 12.

[0090] The hydraulic oil leaving the hydraulic motor 21 passes through the oil passage 32 and the switching valve 52 (supply position 52 a ) and is supplied to the flow divider valve 46 , where it is divided equally into the oil passages 33 and 43 .

[0091] The hydraulic oil supplied from the flow divider valve 46 to the oil passage 33 is supplied to the hydraulic motor 23 through the oil passage 33, and the hydraulic motor 23 rotates and drives the right first divider 13. The hydraulic oil leaving the hydraulic motor 23 is supplied to the hydraulic motor 24 through the oil passage 33, and the hydraulic motor 24 rotates and drives the right second divider 14. The hydraulic oil leaving the hydraulic motor 24 returns to the hydraulic oil tank 54 through the oil passages 49, 48 and the operating valve 47 (normal rotation position 47a).

[0092] The hydraulic oil supplied from the flow divider valve 46 to the oil passage 43 is supplied to the hydraulic motor 25 through the oil passage 43, and the hydraulic motor 25 rotates and drives the left first divider 15. The hydraulic oil leaving the hydraulic motor 25 is supplied to the hydraulic motor 26 through the oil passage 43, and the hydraulic motor 26 rotates and drives the left second divider 16. The hydraulic oil leaving the hydraulic motor 26 returns to the hydraulic oil tank 54 through oil passages 50, 48 and the operating valve 47 (normal rotation position 47a).

[0093] The hydraulic oil leaving the hydraulic motor 22 is supplied to the hydraulic motor 27 through the oil passage 44, and the hydraulic motor 27 rotates and drives the tilting roller 17. The hydraulic oil leaving the hydraulic motor 27 is supplied to the hydraulic motor 28 through the oil passage 44, and the hydraulic motor 28 rotates and drives the tilting roller 18. The hydraulic oil leaving the hydraulic motor 28 returns to the hydraulic oil tank 54 through the oil passages 51, 49, 48 and the operating valve 47 (normal rotation position 47a).

[0094] (Hydraulic oil supply status in reaping unit 3)-2 As shown in FIG. 3, when the operation valve 47 is operated to the normal rotation position 47a and the switching valve 52 is operated to the discharge position 52b, the hydraulic oil in the oil passage 32 is discharged to the hydraulic oil tank .

[0095] This allows the hydraulic motors 23-26 (first dividers 13, 15 and second dividers 14, 16) to be stopped while the hydraulic motors 21, 22, 27, 28 (cutters 11, 12 and tilting rollers 17, 18) are operating. In this state, maintenance work on the first dividers 13, 15 and second dividers 14, 16, etc. can be performed.

[0096] (Hydraulic oil supply status in reaping unit 3) - 3 As shown in Figure 3, when the switching valve 52 is operated to the supply position 52a and the operating valve 47 is operated to the reverse position 47b, the hydraulic oil of the hydraulic pump 29 is supplied from the operating valve 47 (reverse position 47b) and the oil passage 48 to the oil passages 49, 50, and 51.

[0097] The hydraulic oil supplied to the oil passage 49 is supplied to the hydraulic motor 24, which then rotates and drives the right second divider 14 in the reverse direction. The hydraulic oil leaving the hydraulic motor 24 is supplied to the hydraulic motor 23 through the oil passage 33, which then rotates and drives the right first divider 13 in the reverse direction.

[0098] The hydraulic oil supplied to the oil passage 50 is supplied to the hydraulic motor 26, which then drives the left second divider 16 to rotate in the reverse direction. The hydraulic oil leaving the hydraulic motor 26 is supplied to the hydraulic motor 25 through the oil passage 43, which then drives the left first divider 15 to rotate in the reverse direction.

[0099] The hydraulic oil supplied to the oil passage 51 is supplied to the hydraulic motor 28, which then drives the tilting roller 18 to rotate in the reverse direction. The hydraulic oil leaving the hydraulic motor 28 is supplied to the hydraulic motor 27 through the oil passage 44, which then drives the tilting roller 17 to rotate in the reverse direction.

[0100] The hydraulic oil leaving the hydraulic motor 23 is supplied to the flow divider valve 46 through the oil passage 33, and the hydraulic oil leaving the hydraulic motor 25 is supplied to the flow divider valve 46 through the oil passage 43. The hydraulic oils in the oil passages 33 and 43 join together at the flow divider valve 46 and are supplied to the hydraulic motor 21 through the oil passage 32 and the switching valve 52 (supply position 52a). The hydraulic oil leaving the hydraulic motor 27 is supplied to the hydraulic motor 22 through the oil passage 44.

[0101] The hydraulic oil in the oil passages 32, 44 is supplied to the hydraulic motors 21, 22, which then rotate the cutters 11, 12 in the reverse direction. The hydraulic oil leaving the hydraulic motors 21, 22 passes through the oil passage 31 and the operating valve 47 (reverse position 47b) and returns to the hydraulic oil tank 54. This allows maintenance work to be performed on the cutters 11, 12, the first dividers 13, 15, the second dividers 14, 16, the tilting rollers 17, 18, etc.

[0102] (Hydraulic oil supply status in reaping unit 3)-4 3, clogging sensors 55 (clogging detection units) are provided in the oil passages 31, 32, 33, 43, and 44. When crops, earth, or stones become clogged in the cutters 11 and 12, the first dividers 13 and 15, the second dividers 14 and 16, the tipping rollers 17 and 18, or the like, the pressure of the hydraulic oil in the oil passages 31, 32, 33, 43, and 44 increases, and the clogging sensors 55 detect this increase in pressure of the hydraulic oil.

[0103] A control unit 56 is provided, and the detection value of the clog sensor 55 is input to the control unit 56. When the detection value of the clog sensor 55 exceeds a set value, the control unit 56 determines that a clog has occurred in the cutters 11 and 12, the first dividers 13 and 15, the second dividers 14 and 16, the tilting rollers 17 and 18, etc. The control unit 56 activates the alarm buzzer (not shown) and alarm lamp (not shown) of the driving unit 9 (see FIG. 1), and operates the operating valve 47 to the reverse position 47b.

[0104] When the operating valve 47 is operated to the reverse position 47b, as described above, the cutters 11, 12, the first dividers 13, 15, the second dividers 14, 16, and the tipping rollers 17, 18 are rotated in the opposite direction, so that the jammed crops, soil, stones, etc. are expelled and the jam is cleared.

[0105] When a set time (e.g., 5 to 10 seconds) has elapsed since the operating valve 47 was operated to the reverse rotation position 47b, the control unit 56 stops the alarm buzzer (not shown) and alarm lamp (not shown) of the driving unit 9 and operates the operating valve 47 to the forward rotation position 47a.

[0106] (First Alternative Embodiment of the Invention) The hydraulic oils coming out of the hydraulic motors 21 and 22 may be configured to join together into one oil passage (not shown).

[0107] According to the above-described configuration, a branching section (not shown) separate from the flow divider valve 46 is preferably connected to the single oil passage, and the hydraulic oil branched by the branching section is preferably supplied to the flow divider valve 46 and the oil passage 44.

[0108] (Second Alternative Embodiment of the Invention) The hydraulic motor 22 may be eliminated, and the cutters 11, 12 may be configured to be rotationally driven by a single hydraulic motor 21. In the case of a single hydraulic motor 21, a clipper-type cutting device may be provided instead of the cutters 11, 12.

[0109] According to the above-described configuration, a branch section (not shown) separate from the flow divider valve 46 is provided in the oil passage 32, and the hydraulic oil branched by the branch section is preferably supplied to the flow divider valve 46 and the oil passage 44.

[0110] (Third Alternative Embodiment of the Invention) Instead of the first right divider 13 and the second right divider 14, one right divider (not shown) may be provided. Instead of the first left divider 15 and the second left divider 16, one left divider (not shown) may be provided.

[0111] (Fourth Alternative Embodiment of the Invention) Instead of one operation valve 47, a first operation valve 47 and a second operation valve 47 may be provided. When the first and second operation valves 47 are provided, they may be configured as described below.

[0112] Under normal operating conditions, the first and second operating valves 47 are operated to the normal rotation position 47a, and the hydraulic oil of the hydraulic pump 29 is supplied to the oil passage 31 through the first and second operating valves 47 (normal rotation position 47a).

[0113] When the first operating valve 47 is operated to the reverse position 47b, hydraulic oil from the hydraulic pump 29 is supplied to the oil passage 44 and the oil passages 49, 50, and the hydraulic motors 21 to 26 rotate the cutters 11, 12, the right first divider 13 and the right second divider 14, the left first divider 15 and the left second divider 16 in the reverse direction.

[0114] When the second operating valve 47 is operated to the reverse position 47b, hydraulic oil from the hydraulic pump 29 is supplied to the oil passages 49, 50 and 51, and the hydraulic motors 23 to 28 rotate the right first divider 13 and the right second divider 14, the left first divider 15 and the left second divider 16, and the tipping rollers 17 and 18 in the reverse direction.

[0115] When the second operating valve 47 is operated to the reverse position 47b, hydraulic oil from the hydraulic pump 29 is supplied to the oil passages 44, 51, and the hydraulic motors 21, 22, 27, 28 rotate the cutters 11, 12 and the laying down rollers 17, 18 in the reverse direction.

[0116] (Fifth Alternative Embodiment of the Invention) Instead of one operation valve 47, a first operation valve 47, a second operation valve 47, and a third operation valve 47 may be provided. When the first, second, and third operation valves 47 are provided, they may be configured as described below.

[0117] In a normal operating state, the first, second, and third control valves 47 are operated to the normal rotation position 47a, and the hydraulic oil of the hydraulic pump 29 is supplied to the oil passage 31 through the first, second, and third control valves 47 (normal rotation position 47a).

[0118] When the first operating valve 47 is operated to the reverse position 47b, the hydraulic oil from the hydraulic pump 29 is supplied to the oil passages 32, 44, and the hydraulic motors 21, 22 rotate the cutters 11, 12 in the reverse direction.

[0119] When the second operating valve 47 is operated to the reverse position 47b, hydraulic oil from the hydraulic pump 29 is supplied to the oil passages 49, 50, and the hydraulic motors 23 to 26 rotate the right first divider 13, the right second divider 14, the left first divider 15, and the left second divider 16 in the reverse direction.

[0120] When the third operating valve 47 is operated to the reverse position 47b, hydraulic oil from the hydraulic pump 29 is supplied to the oil passage 51, and the hydraulic motors 27, 28 rotate the laying down rollers 17, 18 in the reverse direction.

[0121] (Sixth Alternative Embodiment of the Invention) When a set time has elapsed since the control unit 56 operated the control valve 47 to the reverse position 47b, the control unit 56 may be configured to stop the warning buzzer and warning lamp of the driving unit 9 and operate the control valve 47 to the neutral position 47c. According to this configuration, the operator of the driving section 9 manually operates the control valve 47 to the normal rotation position 47a after the alarm buzzer and alarm lamp have stopped.

[0122] (Correspondence to claims)-1 The farm is provided with right and left dividers (first dividers 13, 15, second dividers 14, 16) that are rotated around vertical axes P3, P4, P5, P6 to separate crops in the field into crops to be harvested and other crops. Between the right and left dividers (first dividers 13, 15, second dividers 14, 16), cutting devices (cutters 11, 12) are provided for cutting the base of the plant of the crop that has been guided as the crop to be harvested.

[0123] There are provided right separate hydraulic motors (hydraulic motors 23, 24) that rotate and drive the right dividers (first divider 13, second divider 14). There are provided left separate hydraulic motors (hydraulic motors 25, 26) that rotate and drive the left dividers (first divider 15, second divider 16). Hydraulic cutting motors (hydraulic motors 21, 22) are provided to drive the cutting devices (cutters 11, 12). A hydraulic pump 29 is also provided.

[0124] A flow dividing section (flow divider valve 46) is provided to divide the supplied hydraulic oil into two systems. A first supply oil passage (oil passage 31) is provided to supply hydraulic oil from the hydraulic pump 29 to the cutting hydraulic motors (hydraulic motors 21, 22). A second supply oil passage (oil passage 32) is provided to supply the hydraulic oil discharged from the cutting hydraulic motors (hydraulic motors 21, 22) to the flow dividing section (flow divider valve 46). A right third supply oil passage (oil passage 33) is provided to supply hydraulic oil from one of the two systems of the flow dividing section (flow divider valve 46) to the right separated hydraulic motor (hydraulic motors 23, 24). A left third supply oil passage (oil passage 43) is provided to supply the hydraulic oil from the other of the two systems of the flow dividing section (flow divider valve 46) to the left separated hydraulic motor (hydraulic motors 25, 26).

[0125] (Correspondence to claims)-2 The flow divider section (flow divider valve 46) is a flow divider valve 46 that divides the hydraulic oil coming out of the cutting hydraulic motor (hydraulic motors 21, 22) evenly into the right third supply oil passage (oil passage 33) and the left third supply oil passage (oil passage 43).

[0126] (Correspondence to claims) - 3 The dividers (first dividers 13, 15, second dividers 14, 16) have first dividers 13, 15 on the side closer to the cutting device (cutters 11, 12) in the left-right direction, and second dividers 14, 16 on the side farther from the cutting device (cutters 11, 12) in the left-right direction.

[0127] The separation hydraulic motors (hydraulic motors 23, 24, 25, 26) include a first separation hydraulic motor (hydraulic motors 23, 25) that rotates and drives the first dividers 13, 15, and a second separation hydraulic motor (hydraulic motors 24, 26) that rotates and drives the second dividers 14, 16.

[0128] The third supply oil passage (oil passage 33, 43) is connected to the first separated hydraulic motor (hydraulic motor 23, 25), and the hydraulic oil from the first separated hydraulic motor (hydraulic motor 23, 25) is supplied to the second separated hydraulic motor (hydraulic motor 24, 26).

[0129] (Correspondence to claims)-4 A divider operation valve (switching valve 52) is provided in the second supply oil passage (oil passage 32) and can be operated to a supply position 52a where the hydraulic oil coming out of the disconnection hydraulic motor (hydraulic motors 21, 22) is supplied to the branch section (flow divider valve 46), and a discharge position 52b where the hydraulic oil coming out of the disconnection hydraulic motor (hydraulic motors 21, 22) is discharged without being supplied to the branch section (flow divider valve 46).

[0130] (Correspondence to claims) - 5 The planter is provided with a crop-falling device (falling rollers 17, 18) located in front of the cutting device (cutters 11, 12) and which falls the crops guided between the right and left dividers (first dividers 13, 15, second dividers 14, 16) forward.

[0131] The lowering hydraulic motors (hydraulic motors 27, 28) are provided to drive the lowering devices (lowering rollers 17, 18). A fourth oil supply passage (oil passage 44) is provided to supply hydraulic oil from the cutting hydraulic motors (hydraulic motors 21, 22) to the lowering hydraulic motors (hydraulic motors 27, 28).

[0132] (Correspondence to claims) - 6 The cutting hydraulic motors (hydraulic motors 21, 22) include a first cutting hydraulic motor (hydraulic motor 21) and a second cutting hydraulic motor (hydraulic motor 22). A first supply oil passage (oil passage 31) branches off and is connected in parallel to a first cutting hydraulic motor (hydraulic motor 21) and a second cutting hydraulic motor (hydraulic motor 22).

[0133] A second oil supply passage (oil passage 32) supplies hydraulic oil discharged from the first disconnection hydraulic motor (hydraulic motor 21) to the flow divider portion (flow divider valve 46). A fourth supply oil passage (oil passage 44) supplies hydraulic oil from the second cutting hydraulic motor (hydraulic motor 22) to the lowering hydraulic motor (hydraulic motors 27, 28).

[0134] (Correspondence to claims) - 7 There are provided disconnection reverse oil passages (oil passages 32, 44) connected to the portions from which hydraulic oil exits in the disconnection hydraulic motors (hydraulic motors 21, 22). Separate reverse oil passages (oil passages 49, 50) are provided which are connected to the portions from which hydraulic oil flows in the separate hydraulic motors (hydraulic motors 23, 24, 25, 26).

[0135] An operating valve 47 is provided which can be operated to a forward rotation position 47a in which the hydraulic oil of the hydraulic pump 29 is supplied to the first supply oil passage (oil passage 31) and a reverse rotation position 47b in which the hydraulic oil of the hydraulic pump 29 is supplied to the disconnection reverse oil passage (oil passages 32, 44) and the separation reverse oil passage (oil passages 49, 50).

[0136] (Correspondence to claims) - 8 A tilting reverse oil passage (oil passage 51) is provided which is connected to a portion from which hydraulic oil is discharged in the tilting hydraulic motor (hydraulic motors 27, 28).

[0137] An operating valve 47 is provided which can be operated to a forward rotation position 47a in which the hydraulic oil of the hydraulic pump 29 is supplied to the first supply oil passage (oil passage 31) and a reverse rotation position 47b in which the hydraulic oil of the hydraulic pump 29 is supplied to the separated reverse oil passage (oil passages 49, 50) and the tilting reverse oil passage (oil passage 51).

[0138] (Correspondence to claims)-9 A clogging detection unit (clogging sensor 55) is provided to detect clogging of crops. A control unit 56 is provided that operates the operating valve 47 to the reverse position 47b based on the detection of clogging by the clogging detection unit (clogging sensor 55). After a preset time has elapsed since the control unit 56 operated the operation valve 47 to the reverse rotation position 47b, the control unit 56 operates the operation valve 47 to the normal rotation position 47a. [Industrial Applicability]

[0139] The present invention is applicable to sugarcane harvesters. [Explanation of symbols]

[0140] 11 Cutter (cutting device) 12 Cutter (cutting device) 13 First Divider (Divider) 14 Second Divider (Divider) 15 First Divider (Divider) 16 Second Divider (Divider) 17. Lodging roller (lodging device) 18. Lodging roller (lodging device) 21 Hydraulic motor (first cutting hydraulic motor) (cutting hydraulic motor) 22 Hydraulic motor (second cutting hydraulic motor) (cutting hydraulic motor) 23 Hydraulic motor (first separate hydraulic motor) (separate hydraulic motor) 24 Hydraulic motor (second separate hydraulic motor) (separate hydraulic motor) 25 Hydraulic motor (first separate hydraulic motor) (separate hydraulic motor) 26 Hydraulic motor (second separate hydraulic motor) (separate hydraulic motor) 27 Hydraulic motor (lowering hydraulic motor) 28 Hydraulic motor (lowering hydraulic motor) 29 Hydraulic Pump 31 Oil passage (first supply oil passage) 32 Oil passage (second supply oil passage) 33 Oil passage (third supply oil passage) 43 Oil passage (third supply oil passage) 44 Oil passage (fourth supply oil passage) (cutting reverse oil passage) 46 Flow divider valve (division part) 47 Control valve 47a Forward rotation position 47b Reversed position 49 Oil path (separate and reverse oil path) 50 Oil path (separate and reverse oil path) 51 Oilway (lodging and reversing oilway) 52 Switching valve (divider operation valve) 52a Supply position 52b Ejection position 55 Clogging sensor (clogging detection part) 56 Control Unit P3 axis center P4 axis center P5 axis center P6 axis center

Claims

1. right and left dividers that are rotated around vertical axes to separate the crops in the field into the crops to be harvested and the other crops; a cutting device between the right and left dividers for cutting the base of a plant indicated as a plant to be harvested; a right separation hydraulic motor for rotationally driving the right divider; a left separation hydraulic motor for rotationally driving the left divider; a cutting hydraulic motor for driving the cutting device; A hydraulic pump; a flow dividing unit that divides the supplied hydraulic oil into two systems, a first supply oil passage that supplies hydraulic oil from the hydraulic pump to the cutting hydraulic motor; a second oil supply passage that supplies hydraulic oil discharged from the cutting hydraulic motor to the branch section; a right third oil supply passage that supplies hydraulic oil from one of the two systems of the branch section to the right separated hydraulic motor; a left third oil supply passage that supplies the other of the two systems of the branch section with hydraulic oil to the left separated hydraulic motor.

2. 2. The sugarcane harvester according to claim 1, wherein the flow dividing section is a flow divider valve that divides the hydraulic oil discharged from the cutting hydraulic motor equally into the right third oil supply line and the left third oil supply line.

3. the divider includes a first divider on a side closer to the cutting device in the left-right direction and a second divider on a side farther from the cutting device in the left-right direction; the separation hydraulic motor includes a first separation hydraulic motor that rotationally drives the first divider and a second separation hydraulic motor that rotationally drives the second divider, 2. The sugarcane harvester according to claim 1, wherein the third oil supply line is connected to the first separate hydraulic motor, and hydraulic oil from the first separate hydraulic motor is supplied to the second separate hydraulic motor.

4. 2. The sugarcane harvester according to claim 1, further comprising a divider operating valve provided in the second oil supply passage and operable between a supply position where the hydraulic oil from the cutting hydraulic motor is supplied to the diverter section and a discharge position where the hydraulic oil from the cutting hydraulic motor is discharged without being supplied to the diverter section.

5. a crop lodging device provided in front of the cutting device and configured to locate the crop forward when guided between the right and left dividers; a lowering hydraulic motor that drives the lowering device, 2. The sugarcane harvester according to claim 1, further comprising a fourth oil supply passage for supplying hydraulic oil from the cutting hydraulic motor to the lodging hydraulic motor.

6. the cutting hydraulic motor includes a first cutting hydraulic motor and a second cutting hydraulic motor; the first supply oil passage branches and is connected in parallel to the first cutting hydraulic motor and the second cutting hydraulic motor, the second oil supply passage supplies hydraulic oil discharged from the first cutting hydraulic motor to the branch section; 6. The sugarcane harvester according to claim 5, wherein the fourth oil supply passage supplies hydraulic oil from the second cutting hydraulic motor to the lodging hydraulic motor.

7. a disconnection reverse oil passage connected to a portion where hydraulic oil is discharged from the disconnection hydraulic motor; a separate reverse oil passage connected to a portion where hydraulic oil in the separate hydraulic motor flows out; 2. The sugarcane harvester according to claim 1, further comprising an operating valve operable to a forward rotation position in which the hydraulic pump supplies hydraulic oil to the first supply oil passage and a reverse rotation position in which the hydraulic pump supplies hydraulic oil to the cutting reverse oil passage and the separation reverse oil passage.

8. a separate reverse oil passage connected to a portion where hydraulic oil flows out of the separate hydraulic motor; a tilting / reverse oil passage connected to a portion where hydraulic oil is discharged from the tilting hydraulic motor; 6. The sugarcane harvester according to claim 5, further comprising an operating valve operable to a forward rotation position where the hydraulic pump supplies hydraulic oil to the first supply oil passage and a reverse rotation position where the hydraulic pump supplies hydraulic oil to the separate reverse oil passage and the tilling reverse oil passage.

9. a clogging detection unit that detects clogging of crops; 9. The sugarcane harvester according to claim 7, further comprising a control unit that operates the operating valve to the reverse position based on the detection of a blockage by the blockage detection unit.

10. The sugarcane harvester according to claim 9, wherein the control unit operates the operating valve to the forward rotation position when a preset time has elapsed since the control unit operated the operating valve to the reverse rotation position.

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