combine

Abstract

To provide a combine-harvester which can easily and previously determine an error in gear change setting of a threshing drum, control a rotation state of the threshing drum to a state suitable to a crop being a harvesting object, and quickly detect a malfunction in the threshing drum.SOLUTION: A combine-harvester comprises: a threshing drum which is provided in a state of being rotatably supported by a threshing drum shaft in a threshing chamber; a speed-change gear which includes a threshing drum input shaft for transmitting rotational power to the threshing drum shaft and is configured to be able to set a rotational speed of the threshing drum to a plurality of gear change stages; a threshing drum rotation sensor 125; a control unit 120; and a monitor 128. The control unit 120 determines whether the rotation speed of the threshing drum detected by the threshing drum rotation sensor 125 matches a correspondence corresponding to the type of crop set by the monitor 128 on the basis of a correspondence between an engine speed previously set for each type of crop and a rotor speed and displays the determination result on the monitor 128.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a combine harvester equipped with a handling cylinder capable of changing the rotational speed.

Background Art

[0002] Conventionally, in a combine harvester, there is a handling cylinder that is rotatably supported in a handling chamber of a threshing unit that threshes the cereal straw cut by a cutting unit, and a speed change device for changing the rotational speed of the handling cylinder. Depending on the type of crop to be harvested, etc., there is a configuration in which the rotational speed of the handling cylinder is changed by the speed change device.

[0003] Regarding a combine harvester having such a configuration, Patent Document 1 describes determining whether the speed change state of the handling cylinder is in a high-speed state or a low-speed state, and displaying the result on a monitor arranged in front of the driver's seat. Specifically, Patent Document 1 compares the speed change state of the handling cylinder determined based on the detection result of a rotation sensor that detects the rotational speed of the handling cylinder with the speed change state of the speed change device set by operating an operating tool. When both match, the speed change state is displayed on the monitor, and when they differ, the operator is notified of this by the monitor and a buzzer.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventional techniques such as those disclosed in Patent Document 1 display on the monitor whether the rotational state of the handling cylinder is in a high-speed state or a low-speed state based on the match or mismatch between the rotational state of the handling cylinder detected by a rotation sensor and the speed change state set by operating the speed change device.

[0006] Therefore, for example, if the operator is unaware of the gear shift settings and fails to check the monitor display during operation, there is a risk that the threshing drum may continue to rotate at a speed unsuitable for the crop being harvested. A rotation speed unsuitable for the crop being harvested can cause clogging of the grain stalks in the threshing chamber and damage to the crop.

[0007] Furthermore, with conventional technology, changes in the rotational speed of the threshing drum caused by malfunctions such as jamming of grain stalks in the threshing chamber or slippage of the threshing drum may not be detected as abnormalities in the rotational state of the threshing drum when compared with the set speed state in the transmission. In such cases, there is a problem in that malfunctions in the threshing drum are not easily recognized immediately.

[0008] This invention has been made in view of the above-mentioned problems, and aims to provide a combine harvester that can easily and in advance determine errors in the threshing drum's speed setting, control the rotation state of the threshing drum to a state suitable for the crop to be harvested, and quickly detect malfunctions in the threshing drum. [Means for solving the problem]

[0009] The combine harvester according to the present invention is a combine harvester that transports stalks cut by a cutting unit and supplies them to a threshing unit, comprising: a threshing drum provided in the threshing chamber of the threshing unit, rotatably supported by a threshing drum shaft; a transmission device having a threshing drum input shaft that rotates upon receiving power from a drive source and transmits rotational power to the threshing drum shaft, and configured to set the rotational speed of the threshing drum to a plurality of gears; a rotation detection device for detecting the rotational speed of the threshing drum; a control unit that receives the detection signal from the rotation detection device; a display device provided in the operating unit whose display content is controlled by the control unit; and a setting device that receives an input operation for setting the type of crop to be harvested and sends information regarding the set crop type to the control unit, wherein the control unit determines whether the rotational speed of the threshing drum detected by the rotation detection device matches the correspondence relationship corresponding to the crop type set by the setting device, based on the correspondence relationship between the rotation speed of the drive source and the rotation speed of the threshing drum, which has been set in advance for each crop type, and displays the result of the determination on the display device.

[0010] In another aspect of the present invention, the combine harvester is configured such that, if the rotational speed of the threshing drum detected by the rotational detection device matches the corresponding relationship to the crop type set by the setting device, the control unit displays the set crop type on the display device, and if the rotational speed of the threshing drum detected by the rotational detection device does not match the corresponding relationship to the crop type set by the setting device, the control unit displays an alarm on the display device.

[0011] In another aspect of the present invention, the combine harvester, in which the control unit displays the type of crop on the display device by blinking when the rotation speed of the threshing drum detected by the rotation detection device matches the correspondence corresponding to the type of crop set by the setting device.

[0012] Another embodiment of the present invention provides a combine harvester equipped with a threshing clutch for intermittently transmitting power from the drive source to the threshing drum shaft, wherein the control unit performs the determination after a predetermined time has elapsed since the threshing clutch entered the engaged state in which power is transmitted to the threshing drum shaft. [Effects of the Invention]

[0013] According to the present invention, errors in the threshing drum's speed setting can be easily and in advance determined, the rotation state of the threshing drum can be controlled to a state suitable for the crop to be harvested, and malfunctions in the threshing drum can be detected quickly. [Brief explanation of the drawing]

[0014] [Figure 1] This is a left side view of a combine harvester according to one embodiment of the present invention. [Figure 2] This is a right side view of a combine harvester according to one embodiment of the present invention. [Figure 3] This is a plan view of a combine harvester according to one embodiment of the present invention. [Figure 4] This is a diagram (transmission mechanism diagram) showing the power transmission configuration in a combine harvester according to one embodiment of the present invention. [Figure 5] This is a diagram (a partial enlargement of Figure 4) showing the configuration of a threshing speed change device according to one embodiment of the present invention. [Figure 6] This is a plan view showing the arrangement configuration of a threshing speed change device according to one embodiment of the present invention. [Figure 7] This is an explanatory diagram illustrating the operation of a threshing speed change device according to one embodiment of the present invention. [Figure 8] This is a block diagram showing the control configuration of a combine harvester according to one embodiment of the present invention. [Figure 9] This figure shows the arrangement configuration of a monitor according to one embodiment of the present invention. [Figure 10] This figure shows an example of the main screen displayed by a monitor according to one embodiment of the present invention. [Figure 11]It is a diagram showing an example of a menu screen displayed by a monitor according to an embodiment of the present invention. [Figure 12] It is a diagram showing an example of a work information setting screen displayed by a monitor according to an embodiment of the present invention. [Figure 13] It is a diagram showing an example of a crop switching screen displayed by a monitor according to an embodiment of the present invention. [Figure 14] It is a diagram showing an example of a setting completion screen displayed by a monitor according to an embodiment of the present invention. [Figure 15] It is a diagram showing an example of the relationship between the engine speed and the rotor speed for each type of crop according to an embodiment of the present invention. [Figure 16] It is a diagram showing an example of an alarm screen displayed by a monitor according to an embodiment of the present invention. [Figure 17] It is a diagram showing an example of the display mode of the crop name display section on the main screen displayed by a monitor according to an embodiment of the present invention. [Figure 18] It is a flowchart showing an example of a control mode by a control unit according to an embodiment of the present invention. [Figure 19] It is a diagram showing an example of the relationship between the engine speed and the rotor speed for each type of crop according to an embodiment of the present invention. [Figure 20] It is a diagram showing an example of a rotor clogging alarm screen displayed by a monitor according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0015] The present invention determines whether the detected rotation speed of the handling cylinder is the rotation speed corresponding to the type of crop to be harvested based on the correspondence relationship with the rotation speed of the drive source for the rotation speed of the handling cylinder that can be set according to the type of crop to be harvested, and displays the determination result on a display device. With such a configuration, the present invention aims to enable the prompt grasping of errors in the speed change setting of the handling cylinder and defects in the handling cylinder. Hereinafter, embodiments of the present invention will be described.

[0016] [Overall configuration of the combine harvester] First, the overall configuration of the combine harvester 1 according to this embodiment will be described using Figures 1 to 4. In the following description, the left side (lower side in Figure 3) and the right side (upper side in Figure 3) of the combine harvester 1, when viewed from the front, will be referred to as the left and right sides of the combine harvester 1, respectively.

[0017] As shown in Figures 1 and 2, the combine harvester 1 according to this embodiment is a conventional combine harvester that collects the harvested crops from the field into the machine body, threshes, sorts, stores the grain, and can transport it out of the machine as needed. The combine harvester 1 has a self-propelled traveling body 2 and a harvesting unit 3 provided at the front end of the traveling body 2. The harvesting unit 3 is configured as a harvesting device that cuts and collects unharvested grains such as rice and wheat, and is mounted on the traveling body 2 so as to be able to move up and down.

[0018] The running machine body 2 is equipped with a running section 4 configured as a crawler-type running device having a pair of left and right crawler sections 5, 5. A machine frame 6 is installed between the left and right crawler sections 5, 5. Each crawler section 5 has a plurality of rotating bodies, including a drive sprocket 5a provided at its front end and a tension roller 5b provided at its rear end, and a track 5c wound around these rotating bodies. The plurality of rotating bodies constituting the crawler section 5 are mounted on a track frame 5d provided on the underside of the running machine body 2. The drive sprocket 5a is rotationally driven by power transmitted from the engine 25, which is the drive source of the combine harvester 1.

[0019] On the left side of the machine frame 6, there is a threshing unit 7 for threshing the stalks of grain that have been cut and supplied by the harvesting unit 3, and a sorting unit 8 for sorting the grains threshed by the threshing unit 7. The threshing unit 7 and the sorting unit 8 are arranged with the threshing unit 7 on the upper level and the sorting unit 8 on the lower level.

[0020] On the machine frame 6, a grain storage section 9 is provided to the right of the threshing section 7 and sorting section 8, and has a grain tank 10 for storing grain (clean grain) sorted in the sorting section 8. Inside the grain tank 10, a lower discharge conveyor 11 is provided to transport the stored grain toward the discharge port of the grain tank 10 (see Figure 4). A vertical conveyor 12 is erected vertically so as to communicate with the discharge port of the grain tank 10. A grain discharge conveyor 13 is connected to the upper end of the vertical conveyor 12. The grain discharge conveyor 13 is provided so as to be able to rotate horizontally and swing up and down around a horizontal axis. The grain in the grain tank 10 is transported by these conveyors and discharged from a paddy input port 14 provided at the tip of the grain discharge conveyor 13 to the bed of a truck or a container.

[0021] Furthermore, on the machine frame 6, a driver's compartment 15 is provided in front of the grain storage unit 9, that is, in the front right position on the machine frame 6, where the operator sits. The driver's compartment 15 is covered by a cabin 16. The driver's compartment 15 is equipped with a driver's seat 17, a steering wheel 18 located in front of the driver's seat 17, a main gear lever 21, a sub-gear lever 22, a work clutch lever 23, and the like. The work clutch lever 23 is a work operating tool for engaging and disengaging the threshing clutch 57 and the harvesting clutch 75 (see Figure 4). The main gear lever 21, the sub-gear lever 22, and the work clutch lever 23 are located on a lever column 24 provided on the left side of the driver's seat 17.

[0022] An engine 25, which serves as a power source, is located behind the grain storage section 9 on the traveling body 2. The engine 25 is a diesel engine and is equipped with a diesel particulate filter (DPF) 26, which is an exhaust gas purification device. The DPF 26 captures particulate matter, mainly black smoke, from the exhaust gas emitted from the engine 25. The engine 25 purifies the exhaust gas by passing it through the DPF 26.

[0023] The harvesting unit 3 will now be described. The harvesting unit 3 includes a feeder 30 as a conveying device, a grain header (platform) 31, a cutting blade device 32, a pair of left and right grass dividers 33, 33, and a raking reel 34.

[0024] The feeder 30 is a conveying device that transports the stalks harvested in the harvesting section 3 and supplies them to the threshing section 7. The feeder 30 has a feeder house 35 as a housing and a conveyor 36 for transporting stalks provided inside the feeder house 35. The feeder 30 is located to the left of the cabin 16 and is provided with the rear end opening of the feeder house 35, which is configured as a roughly rectangular tube with its longitudinal direction as the front-to-back direction in a plan view, communicating with the front opening 7a on the front side of the threshing section 7.

[0025] The grain header 31 is configured in a horizontally elongated bucket shape and is connected to the front side of the feeder 30 so as to communicate with the front end opening of the feeder house 35. A grafting auger (platform auger) 37 is provided inside the grain header 31. The grafting auger 37 is mounted on an axis so as to be rotatable with the left-right direction as the axis of rotation.

[0026] The cutting blade device 32 is provided on the front lower edge of the grain header 31 and is configured in a clipper-like shape. The pair of left and right dividers 33, 33 are provided so as to protrude forward from the left and right sides of the front of the grain header 31. The raking reel 34 is a reel with a tine bar and is provided in a position in front and above the raking auger 37. The raking reel 34 is supported so as to be rotatable with the left-right direction as the axis of rotation between the tips of a pair of left and right reel support arms 34a, 34a, whose base ends are pivotally supported on the grain header 31. The raking reel 34 rotates and continuously acts on the podded portion of the grain stalk, raking the podded portion of the grain stalk towards the raking auger 37. Power from the engine 25, transmitted via various transmission mechanisms, is used for the operation of each part of the harvesting unit 3.

[0027] The conveyor 36 inside the feeder house 35 has a harvesting input shaft (feeder house conveyor shaft) 38 located at the front of the threshing unit 7, with its axial direction running left to right, as a drive shaft that pivots at the end of the feeder. The rear end of the feeder 30 is supported by the harvesting input shaft 38 so as to be rotatable with its axial direction running left to right. A lifting cylinder 39 is interposed between the lower surface of the feeder house 35 and the machine frame 6. The extension and retraction of the lifting cylinder 39 causes the harvesting unit 3 to move up and down using the harvesting input shaft 38 as the pivot shaft. The lifting and lowering operation of the harvesting unit 3 is controlled by a predetermined operating unit provided in the driver's unit 15.

[0028] The threshing section 7 and the sorting section 8 will now be described. The threshing section 7 has a threshing cylinder 41 provided in a threshing chamber 40 with a threshing opening 7a opening to the front, and a receiving net 42 positioned below the threshing cylinder 41. The threshing cylinder 41 is provided in the threshing chamber 40 in a state where it can rotate, supported by a threshing cylinder shaft 41a whose axial direction is in the front-rear direction.

[0029] The threshing drum 41 has a cylindrical body with the threshing drum shaft 41a aligned along its central axis, and spiral blades are provided on the outer surface of the body. Multiple dust supply valves are provided on the upper side of the threshing drum 41, which can be angle-adjusted to adjust the conveying speed (residence time) of the threshed grain in the threshing chamber 40. The receiving net 42 is for allowing the grain to leak out and is provided along the outer surface of the lower part of the threshing drum 41.

[0030] The sorting unit 8 includes a rocking sorting plate 43 as a rocking unit located below the receiving net 42, a rocking mechanism 44 including a rocking shaft 44a that rocks the rocking sorting plate 43 by rotational power from a drive source, a first conveyor 45, a second conveyor 46, and a winnowing machine 47. As shown in Figure 4, a pre-fan 71 is provided in front of the winnowing machine 47, and a second fan 72 is provided behind the winnowing machine 47.

[0031] The oscillating sorting plate 43 has a feed pan, a chaff sieve positioned behind the feed pan to adjust the amount of grain leakage, and a grain sieve positioned below the chaff sieve, among other components for specific gravity sorting. The first conveyor 45 is positioned in the first trough, which extends in the machine width direction, to collect the first grain. The second conveyor 46 is positioned behind the first conveyor 45 and is positioned in the second trough, which extends in the machine width direction, to collect the second grain. The winnowing machine 47 blows sorting air onto the oscillating sorting plate 43, which exits from the front-downward to the rear-upward.

[0032] Furthermore, a return conveyor 48 is provided on the left side of the machine body where the threshing section 7 and sorting section 8 are installed. The return conveyor 48 is connected to the second conveyor 46 with its lower end positioned near the second conveyor 46, and its upper end is positioned near the front end of the threshing drum 41, extending in an upward sloping manner. In addition, an upper conveyor 49 (see Figure 4) is provided at the upper end of the return conveyor 48, extending in the left-right direction in front of the threshing drum 41.

[0033] The combine harvester 1, having the configuration described above, raises the harvesting unit 3 to a desired height relative to the ground (the harvesting height of the grain stalks) by the lifting and lowering motion of the feeder 30, which is supported by the harvesting input shaft 38, in the field, and moves from a non-working state to a working state, and in that state moves on the traveling machine body 2. As a result, the combine harvester 1 separates the harvested crop into those to be harvested and those not to be harvested by the left and right dividers 33, 33, and cuts the grain stalks with the cutting blade device 32 while raking in the pod-bearing portion on the ear end of the grain stalks to be harvested with the raking reel 34.

[0034] The podded portions of the grain stalks, harvested at the desired harvesting position, are raked into the grain header 31 by a rotating auger 37 and collected near the entrance of the feeder house 35 in the left and right center of the grain header 31. From there, they are fed through the feeder house 35 via a conveyor 36 and into the threshing opening 7a, where they are supplied to the threshing unit 7. In this way, the combine harvester 1 is configured to transport the grain stalks harvested by the harvesting unit 3 and supply them to the threshing unit 7.

[0035] The podded portions of the grain stalks supplied to the threshing unit 7 are threshed by the threshing unit 7. Specifically, the grain stalks supplied to the threshing unit 7 are conveyed backward by the rotating threshing drum 41, and are threshed mainly between the threshing drum 41 and the receiving screen 42. Threshed grains smaller than the mesh size of the receiving screen 42 leak through the receiving screen 42. Straw and other debris that do not leak through the receiving screen 42 are discharged into the field through a dust outlet located at the rear of the sorting unit 8 by the conveying action of the threshing drum 41.

[0036] Meanwhile, the grains that have been threshed in the threshing section 7 and have leaked out of the receiving screen 42 are sorted in the sorting section 8. Specifically, the threshed grains that have been threshed in the threshing drum 41 and have leaked out of the receiving screen 42 are sorted into fine grains (first grade), grains with stems and other parts attached and mixed with straw (second grade), and straw scraps, etc., by the specific gravity sorting action of the oscillating sorting plate 43 and the wind sorting action of the winnowing machine 47, and then removed.

[0037] The grain (first-grade) that falls from the oscillating sorting plate 43 after sorting in the sorting section 8 is transported to the grain tank 10 by the first conveyor 45 and the connected lifting grain conveyor (not shown). The second-grade grain is returned to the threshing start end of the threshing drum 41 by the second conveyor 46 and the connected return conveyor 48 and upper conveyor 49, and undergoes threshing again. Straw and other debris are discharged into the field from the dust discharge port located at the rear of the sorting section 8.

[0038] Next, the power transmission configuration of the combine harvester 1 according to this embodiment will be explained with reference to Figure 4. The combine harvester 1 uses the rotational power of the engine 25 to drive the harvesting unit 3, the traveling unit 4, the threshing unit 7, the sorting unit 8, and the grain storage unit 9.

[0039] The rotational power of the output shaft 25a of the engine 25 is transmitted to the first countershaft 51 by a first belt transmission mechanism 52 provided between the output shaft 25a and the first countershaft 51. Meanwhile, the rotational power of the engine 25 is transmitted to the lower discharge conveyor 11, the vertical conveying conveyor 12, and the grain discharge conveyor 13 via the auger clutch 53. The engine 25 also has a work equipment pump shaft 25b that drives a charge pump 54 that operates the lifting cylinder 39 and the like.

[0040] The rotational power transmitted from the output shaft 25a of the engine 25 to the first countershaft 51 is branched into a power transmission system for the threshing unit 7 and a power transmission system for the traveling unit 4, the sorting unit 8, and the harvesting unit 3.

[0041] Regarding the power transmission system to the threshing unit 7, the rotational power of the first counter shaft 51 is transmitted to the first rotor drive shaft 56 by the second belt transmission mechanism 55. The second belt transmission mechanism 55 is provided with a threshing clutch 57 that transmits the rotational power of the first counter shaft 51 to the first rotor drive shaft 56 intermittently as needed.

[0042] The rotational power of the first rotor drive shaft 56 is transmitted to the threshing drum input shaft 59, which is the rotor drive shaft, via the threshing speed change device 58. The rotational power of the threshing drum input shaft 59 is transmitted to the threshing drum shaft 41a via the third belt transmission mechanism 60. Thus, the combine harvester 1 is equipped with a threshing clutch 57 for intermittently transmitting power from the engine 25 to the threshing drum shaft 41a.

[0043] With this configuration, the driving force of the engine 25 is transmitted to the threshing unit 7. Then, by operating the work clutch lever 23, the threshing clutch 57 is turned ON / OFF, and the power transmission to the threshing unit 7 is interrupted.

[0044] Regarding the power transmission system to the running section 4, the rotational power of the first countershaft 51 is transmitted to the second countershaft 62 by the fourth belt drive mechanism 61. The rotational power of the second countershaft 62 is transmitted to the HST input shaft 64 via the fifth belt drive mechanism 63, and the HST input shaft 64 inputs power to the transmission 65, which includes the running HST and the turning HST. Here, "HST" refers to a hydraulic continuously variable transmission that employs a method of converting hydraulic pressure generated by driving a hydraulic pump back into rotational force using a hydraulic motor. The driving force of the transmission 65 rotates the drive sprocket 5a of the crawler section 5 that constitutes the running section 4.

[0045] Regarding the power transmission system to the sorting section 8, the rotational power of the second counter shaft 62 is transmitted to the first PTO drive shaft 67 by the sixth belt transmission mechanism 66, and the rotational power of the first PTO drive shaft 67 is transmitted to the second PTO drive shaft 69 via a transmission mechanism 68 including gears, etc. The rotational power of the second PTO drive shaft 69 is transmitted by a predetermined transmission mechanism to the pre-fan shaft 71a that rotates the pre-fan 71, the winnowing machine shaft 47a that rotates the winnowing machine 47, and the first conveyor shaft 45a that rotates the first conveyor 45. In addition, the rotational power of the second PTO drive shaft 69 is transmitted to the oscillating shaft 44a of the oscillating mechanism 44 via the first conveyor shaft 45a. Furthermore, the rotational power of the first conveyor shaft 45a is transmitted by a predetermined transmission mechanism to the second fan shaft 72a that rotates the second fan 72.

[0046] The rotational power of the oscillating shaft 44a is transmitted by a predetermined transmission mechanism to the second conveyor shaft 46a, which rotates the second conveyor 46. The rotational power of the second conveyor shaft 46a is transmitted by a predetermined transmission mechanism to the vertical conveyor shaft 48a, which rotates the return conveyor 48, and the rotational power of the vertical conveyor shaft 48a is transmitted by a predetermined transmission mechanism to the horizontal conveyor shaft 49a, which rotates the upper conveyor 49.

[0047] Regarding the power transmission system to the harvesting unit 3, the rotational power of the second PTO drive shaft 69 is transmitted to the harvesting input shaft 38 by the seventh belt transmission mechanism 73. The conveyor 36 inside the feeder house 35 is operated by the rotational drive of the harvesting input shaft 38. The seventh belt transmission mechanism 73 is equipped with a harvesting clutch 75 that transmits the rotational power of the second PTO drive shaft 69 to the harvesting input shaft 38 intermittently as needed.

[0048] The rotational power of the harvesting input shaft 38 is transmitted to the PF drive shaft 77 by the first chain transmission mechanism 76. The rotational power of the PF drive shaft 77 is transmitted to the PF auger shaft 37a, which rotates the raking auger 37, via the second chain transmission mechanism 78. The rotational power of the PF drive shaft 77 is also transmitted to the cutting blade drive shaft 32a, which drives the cutting blade device 32, via the eighth belt transmission mechanism 80. Furthermore, the rotational power of the PF drive shaft 77 is transmitted to the reel shaft 34b, which rotates the raking reel 34, by a power transmission mechanism including the first reel counter shaft 81 and the second reel counter shaft 82.

[0049] With this configuration, the driving force of the engine 25 is transmitted to the harvesting unit 3. Then, by operating the work clutch lever 23, the harvesting clutch 75 is turned ON / OFF, and the power transmission to the harvesting unit 3 is interrupted.

[0050] The combine harvester 1 according to this embodiment, having the above configuration, has the following configuration for controlling the rotational speed of the threshing drum 41 by a threshing speed change device 58 as a speed change device.

[0051] First, the threshing speed change device 58 will be explained using Figures 5 to 7. The threshing speed change device 58 has a threshing drum input shaft 59 that rotates upon receiving power from the engine 25 and transmits rotational power to the threshing drum shaft 41a, and is a speed change device configured to set the rotational speed of the threshing drum 41 to multiple speed stages. The threshing speed change device 58 has a three-stage configuration with a low-speed gear train, a medium-speed gear train, and a high-speed gear train, and is configured to set the rotational speed of the threshing drum 41 to three speed stages: low-speed, medium-speed, and high-speed.

[0052] As shown in Figure 5, the threshing speed change device 58 has a threshing drum input shaft 59 arranged axially in the front-rear direction of the machine body, and a counter shaft 90 provided below the threshing drum input shaft 59 and parallel to the threshing drum input shaft 59. The counter shaft 90 receives rotational power from the first rotor drive shaft 56 via a first bevel gear 91 fixed to the left end of the first rotor drive shaft 56, which is provided axially in the left-right direction of the machine body, and a second bevel gear 92 fixed to the front end of the counter shaft 90 and meshed with the first bevel gear 91.

[0053] Furthermore, a pulley 94, which constitutes the second belt transmission mechanism 55 (see Figure 4) and which houses a threshing clutch 57, is fixed to the right end of the first rotor drive shaft 56. In addition, pulleys 85 and 86, which constitute the third belt transmission mechanism 60, are fixed to the rear ends of the threshing drum input shaft 59 and the threshing drum shaft 41a, respectively.

[0054] As shown in Figure 5, the threshing speed change device 58 has a low-speed gear train (101, 102), a medium-speed gear train (103, 104), and a high-speed gear train (105, 106), which are combinations of pairs of gears supported on each shaft and meshable with each other, located between the counter shaft 90 and the threshing drum input shaft 59. These gear trains are arranged in the order of low-speed gear train, medium-speed gear train, and high-speed gear train from front to rear. The various gears and other components constituting the threshing speed change device 58 are housed in the housing 95 of the threshing speed change device 58 (see Figure 6).

[0055] Of the pair of low-speed gears, the first low-speed gear 101, which is the low-speed gear on the counter shaft 90 side, is fixed to the counter shaft 90. The second low-speed gear 102, which is the low-speed gear on the threshing drum input shaft 59 side, is supported so as to be rotatable relative to the threshing drum input shaft 59 while being positioned axially with respect to the threshing drum input shaft 59. The first low-speed gear 101 and the second low-speed gear 102 are always meshed.

[0056] Of the pair of medium-speed gears, the first medium-speed gear 103, which is on the counter shaft 90 side and has a larger diameter than the first low-speed gear 101, is fixed to the counter shaft 90. Of the pair of high-speed gears, the first high-speed gear 105, which is on the counter shaft 90 side and has a larger diameter than the first medium-speed gear 103, is fixed to the counter shaft 90.

[0057] On the other hand, a second medium-speed gear 104, which is smaller in diameter than the second low-speed gear 102 and is provided on the thrushing drum input shaft 59 side, and a second high-speed gear 106, which is smaller in diameter than the second medium-speed gear 104 and is also provided on the thrushing drum input shaft 59 side, constitute an integrated slider gear 107 provided on the thrushing drum input shaft 59. The second medium-speed gear 104 is provided at the front of the slider gear 107, and the second high-speed gear 106 is provided at the rear of the slider gear 107. The slider gear 107 is supported by spline fitting or the like so that it can slide axially with respect to the thrushing drum input shaft 59 but cannot rotate relative to it.

[0058] The slider gear 107 moves along the axis of the thruster drum input shaft 59 and engages with the second low-speed gear 102, thereby transmitting the rotation of the second low-speed gear 102 to the thruster drum input shaft 59. The slider gear 107 has an outer circumference gear portion 107a on its front side for engaging with the second low-speed gear 102. On the other hand, the second low-speed gear 102 has an inner circumference gear portion 102a on its rear side that meshes with the outer circumference gear portion 107a. The outer circumference gear portion 107a meshes with the inner circumference gear portion 102a in a fitted manner as the slider gear 107 slides forward.

[0059] As shown in Figure 6, the threshing speed change device 58 is configured to perform a speed change operation by moving a slider gear 107 in the axial direction of the threshing drum input shaft 59 when operated by a threshing speed change lever 110, which is an operating tool. The threshing speed change lever 110 is a substantially straight rod-shaped member that extends substantially in the front-rear direction, and one end, the front end, is rotatably connected to the tip of a rotating operating arm 111. The base end of the rotating operating arm 111 is connected to an operating shaft 112 that protrudes upward from the housing 95 of the threshing speed change device 58. The rotating operating arm 111 rotates integrally with the operating shaft 112, with the operating shaft 112 as the pivot axis.

[0060] The operating shaft 112 is provided so as to be rotatable in the vertical direction as its axial direction. Within the housing 95, the operating shaft 112 is linked to a shift fork (not shown) via a connecting operating member such as an arm. The shift fork is provided so as to be movable in the front-rear direction while engaged with the slider gear 107, and moves in the front-rear direction integrally with the slider gear 107. The rotational movement of the operating shaft 112 is transmitted via the connecting operating member and the shift fork as a sliding movement of the slider gear 107 on the steering cylinder input shaft 59.

[0061] As shown in Figure 6, the threshing speed change device 58 is located to the right of the rear of the right side wall portion 40a that forms the threshing chamber 40 housing the threshing drum 41. Inside the housing 95 of the threshing speed change device 58, the front portion of the threshing drum input shaft 59 and the counter shaft 90 are arranged in parallel vertically and are rotatably supported via bearings. A bevel case 96 is provided on the front side of the housing 95, housing the first bevel gear 91 and the second bevel gear 92 and the shafts that support them. The right end of the first rotor drive shaft 56 protrudes to the right from the bevel case 96, and a pulley 94 is fixed to this protruding portion of the first rotor drive shaft 56. Also, a cylindrical shaft case 97 is provided on the rear side of the housing 95, housing the threshing drum input shaft 59 that extends rearward from inside the housing 95. The rear end of the threshing drum input shaft 59 protrudes rearward from the shaft case 97, and a pulley 85 is fixed to this protruding portion of the threshing drum input shaft 59.

[0062] The rotating operating arm 111 extends so that its tip, which receives the connection to the threshing speed control lever 110, is positioned to the left of the operating shaft 112. The front end of the threshing speed control lever 110 is connected to the tip of the rotating operating arm 111 by a pivot support 113 so as to be rotatable in the vertical direction as an axial direction. The threshing speed control lever 110 has a bent portion 110a at its front end, which is bent at a right angle to the left. In the left-right direction, the front end of the threshing speed control lever 110 is positioned between the operating shaft 112 and the pivot support 113, and the tip of the bent portion 110a is pivotally supported at the tip of the rotating operating arm 111 by the pivot support 113.

[0063] The threshing speed control lever 110 extends towards the rear of the machine, roughly along the front-rear direction, with its other end, the rear end, positioned behind the third belt transmission mechanism 60, which is located behind the threshing chamber 40 in the front-rear direction. The rear end of the threshing speed control lever 110 is bent at a right angle, for example, upward, to form a gripping portion 110b.

[0064] The speed change operation for the threshing speed change device 58 is performed by pushing and pulling the threshing speed change lever 110 back and forth while gripping the gripping part 110b (see Figure 6, arrow A1). As the threshing speed change lever 110 is pushed and pulled back and forth, the rotating operating arm 111, located to the left of the operating shaft 112, rotates integrally with the operating shaft 112 so that its tip moves back and forth (see Figure 6, arrow A2). As a result, the slider gear 107 in the threshing speed change device 58 slides, and the speed change operation of the threshing speed change device 58 is performed.

[0065] According to the arrangement of the threshing speed control lever 110 in this embodiment, operation of the threshing speed control lever 110 is performed from the rear of the traveling machine 2. The arrangement of the threshing speed control lever 110 is not limited, and the position from which the threshing speed control device 58 can be operated can be appropriately changed by adjusting the placement of the threshing speed control lever 110.

[0066] As shown in Figure 6, of the three gear stages of the threshing speed change device 58, the first rotation position P1, which is the position in which the tip of the rotating operating arm 111 is positioned furthest forward, corresponds to the low-speed gear state (hereinafter referred to as the "low-speed state"). The first rotation position P1 is the position in which the extension direction of the rotating operating arm 111 makes an angle of approximately 50° forward with respect to the left-right direction (up-down direction in Figure 6).

[0067] Furthermore, regarding the rotational position of the rotating operating arm 111, the second rotational position P2, where the tip of the rotating operating arm 111 is positioned in front of the operating shaft 112 and behind the first rotational position P1, corresponds to the medium-speed gear state (hereinafter referred to as the "medium-speed state"). The second rotational position P2 is the position where the angle of the extension direction of the rotating operating arm 111 toward the front with respect to the left-right direction is approximately 20°. In Figure 6, the state in which the rotating operating arm 111 is in the second rotational position P2 is shown by a dashed line.

[0068] Furthermore, regarding the rotational position of the rotating operating arm 111, the third rotational position P3, where the tip of the rotating operating arm 111 is positioned behind the operating shaft 112, corresponds to the high-speed gear state (hereinafter referred to as the "high-speed state"). The third rotational position P3 is the position where the angle to the rear with respect to the left-right direction of the extension direction of the rotating operating arm 111 is approximately 20°. In Figure 6, the state in which the rotating operating arm 111 is in the third rotational position P3 is shown by a dashed line.

[0069] The power transmission path for each gear change state of the threshing speed changer 58 is as follows. As shown in Figure 7A, in the low-speed state of the threshing speed changer 58, the slider gear 107 moves forward on the threshing drum input shaft 59 and engages with the second low-speed gear 102 by meshing the outer gear portion 107a with the inner gear portion 102a. As a result, the rotational power of the counter shaft 90 is transmitted to the threshing drum input shaft 59 via the first low-speed gear 101, the second low-speed gear 102, and the slider gear 107 (see arrow B1). Here, the slider gear 107 functions to fix the second low-speed gear 102 with respect to the threshing drum input shaft 59 in the direction of axial rotation and to transmit the rotation of the second low-speed gear 102 to the threshing drum input shaft 59.

[0070] As shown in Figure 7B, in the threshing speed changer 58 at medium speed, the slider gear 107 is positioned in the middle of the front-to-rear position on the threshing drum input shaft 59 with its engagement with the second low-speed gear 102 disengaged, and the second medium-speed gear 104 meshes with the first medium-speed gear 103. As a result, the rotational power of the counter shaft 90 is transmitted to the threshing drum input shaft 59 via the first medium-speed gear 103 and the second medium-speed gear 104 (see arrow B2).

[0071] As shown in Figure 7C, in the high-speed threshing speed changer 58, the slider gear 107 is positioned further back on the threshing drum input shaft 59 than in the medium-speed state, and the second high-speed gear 106 meshes with the first high-speed gear 105. As a result, the rotational power of the counter shaft 90 is transmitted to the threshing drum input shaft 59 via the first high-speed gear 105 and the second high-speed gear 106 (see arrow B3).

[0072] An example of the correspondence between the different speed settings of the threshing drum 41 by the threshing speed change device 58 and the types of crops harvested by the combine harvester 1 is as follows: The low speed setting is used when the crop to be harvested is a relatively large grain such as soybeans; the medium speed setting is used when the crop to be harvested is a relatively small grain such as corn; and the high speed setting is used when the crop to be harvested is an even smaller grain such as rice or wheat. However, the correspondence between the speed settings of the threshing speed change device 58 and the types of crops is not particularly limited.

[0073] Next, the control configuration of the combine harvester 1 will be explained using Figure 8. As shown in Figure 8, the combine harvester 1 is equipped with a control unit 120. The control unit 120 controls each part of the combine harvester 1 based on input signals from various sensors and other devices equipped in the combine harvester 1.

[0074] The control unit 120 is comprised of a control device that connects a CPU (Central Processing Unit) as an arithmetic processing unit that performs various calculations and controls, a storage unit 121 consisting of storage devices such as RAM (Random Access Memory) and ROM (Read Only Memory), input / output devices (input / output circuits) such as input / output interfaces for data input / output, and peripheral circuits such as clock circuits via a bus or the like. The CPU of the control unit 120 performs calculations according to various programs stored in the storage unit 121. The control unit 120 also has a timer 122 for measuring time.

[0075] As shown in Figure 8, the combine harvester 1 is electrically connected to the input device (input circuit) of the control unit 120 and includes an engine rotation sensor 124 for detecting the rotational speed of the engine 25, a threshing drum rotation sensor 125 as a rotation detection device for detecting the rotational speed of the threshing drum 41, and a threshing clutch sensor 126 for detecting the on / off state of the threshing clutch 57. The control unit 120 receives signals from these sensors and generates control signals based on these signals.

[0076] The control unit 120 receives a detection signal from the engine rotation sensor 124 and detects the engine speed, which is the rotational speed of the engine 25. The control unit 120 also receives a detection signal from the threshing drum rotation sensor 125 and detects the threshing drum rotation speed, which is the rotational speed of the threshing drum 41.

[0077] The combine harvester 1 has a monitor 128 that functions as a display device and setting device, and a buzzer 129 that generates an alert sound, both of which are electrically connected to the output device (output circuit) of the control unit 120. The control unit 120 controls the monitor 128 and the buzzer 129 based on the control signals it generates. The control unit 120 has, as functional units, a monitor control unit that controls the monitor 128 and a buzzer control unit that controls the buzzer 129.

[0078] Furthermore, the monitor 128 functions as a display and operation unit operated by the operator. For this reason, the monitor 128 is electrically connected to the input device (input circuit) of the control unit 120, and the control unit 120 receives a signal input from the monitor 128 and generates a control signal based on that signal.

[0079] The monitor 128 is located in the driver's compartment 15 within the cabin 16. As shown in Figures 3 and 9, the monitor 128 is located in the driver's compartment 15 in the area where the steering wheel 18 is positioned in front of the driver's seat 17. Specifically, as shown in Figure 9, the steering wheel 18 has an annular steering wheel body 18A, and the monitor 128 is located in the center of the inside of the steering wheel body 18A. The monitor 128 is fixed in place so that its display orientation remains constant regardless of the operation of the steering wheel 18, such as the rotation of the steering wheel body 18A.

[0080] The monitor 128 is a liquid crystal monitor with touch panel functionality, and its display content is controlled by the control unit 120. The monitor 128 is a display unit that shows various statuses of the combine harvester 1 to the operator, etc. As shown in Figure 9, the monitor 128 has a rectangular display screen, a liquid crystal panel 131, and a plurality of command buttons 132 that serve as operation buttons.

[0081] The liquid crystal panel 131 is positioned in the center of the front of the monitor 128, and is designed to display most of the front of the monitor 128. The liquid crystal panel 131 displays various screens based on instructions from the control unit 120. The liquid crystal panel 131 is a touch-panel type operation screen that can be operated by touching the screen. However, the liquid crystal panel 131 does not necessarily have to be a touch panel.

[0082] Multiple command buttons 132 are arranged in the area surrounding the monitor 128 on the front of the monitor 128. In the example shown in Figure 9, five command buttons 132 are arranged in a row horizontally at predetermined intervals on the underside of the liquid crystal panel 131. These command buttons 132 are used to operate the content displayed on the liquid crystal panel 131.

[0083] The buzzer 129 is a sound generating unit that produces an electronic sound. The buzzer 129 is equipped with an output unit such as a speaker to emit the electronic sound. The operation of the buzzer 129, that is, the operation of generating the electronic sound, is controlled by the control unit 120.

[0084] Figure 10 shows an example of the main screen 140, which is one of the display screens on the liquid crystal panel 131 of the monitor 128. The main screen 140 has various display sections that show various statuses of the combine harvester 1.

[0085] As shown in Figure 10, a speed meter 141, which displays the travel speed of the combine harvester 1, is located in the center of the main screen 140. Surrounding the speed meter 141, a tachometer 142, which displays the rotational speed of the engine 25, is arranged as a roughly circular display unit.

[0086] To the left of the tachometer 142 are a fuel gauge 143, which displays the remaining fuel level, and a urea gauge 144, which displays the remaining urea level. The urea level displayed by the urea gauge 144 is the remaining amount of urea in the urea tank that stores the urea water supplied to the Selective Catalytic Reduction (SCR) system, which is part of the exhaust gas purification device (not shown) of the combine harvester 1 along with the DPF (diesel particulate filter) case. To the right of the tachometer 142 is a grain tank monitor 145, which displays the amount of grain stored in the grain tank 10. Below the grain tank monitor 145 are various displays that show the crop yield (kg), working time (h), and the current date and time.

[0087] In the lower left of the tachometer 142 and in the lower left of the main screen 140, there is a crop name display unit 147 that displays the currently set crop type (crop name). The crop name display unit 147 displays the crop type selected by the operator. In the example shown in Figure 10, the word "Soybean" is displayed in the crop name display unit 147. The setting of crop types will be described later.

[0088] At the lower edge of the display screen of the LCD panel 131, the first operation display section 151, the second operation display section 152, the third operation display section 153, the fourth operation display section 154, and the fifth operation display section 155 are arranged from left to right as operation display sections corresponding to each command button 132. These operation display sections are displayed as five divided areas corresponding to the arrangement of the five command buttons 132.

[0089] Each operation display unit 151 to 155 displays characters, symbols, etc., for display operation as appropriate, depending on the type of display screen of the liquid crystal panel 131. In the example shown in Figure 10, the word "Menu" is displayed on the first operation display unit 151, and by pressing the command button 132 corresponding to the first operation display unit 151 or the first operation display unit 151 itself, the display on the liquid crystal panel 131 transitions to the menu screen 160 (see Figure 11). Hereafter, pressing the command button 132 corresponding to each operation display unit 151 to 155 or pressing each operation display unit 151 to 155 itself will be collectively referred to as the operation of that operation display unit.

[0090] The setting of crop types using monitor 128 will be explained with reference to Figures 11 to 14. The crop type is set by the operator's operation of monitor 128. In other words, with regard to setting the crop type, monitor 128 functions as a setting device that receives an input operation to set the type of crop to be harvested and sends information regarding the set crop type to the control unit 120.

[0091] Figure 11 shows an example of a menu screen 160, which is one of the display screens on the liquid crystal panel 131 of the monitor 128. A screen content display unit 157 is located at the upper edge of the display screen of the liquid crystal panel 131, and displays the content of that screen. In the menu screen 160, the word "Menu" is displayed on the screen content display unit 157.

[0092] As shown in Figure 11, the menu screen 160 has multiple setting item display units (161, 162, 163) which are display units that show various setting items related to the control of the combine harvester 1. In the example shown in Figure 11, the setting item display units are arranged from top to bottom as follows: the first setting item display unit 161 which displays the words "Combine Settings", the second setting item display unit 162 which displays the words "Basic Settings", and the third setting item display unit 163 which displays the words "Work Information Settings". Each of these setting item display units is provided as a band-shaped display unit that covers approximately the entire left-right area of ​​the LCD panel 131 screen.

[0093] On the menu screen 160, the word "Back" is displayed on the first operation display unit 151. By operating the first operation display unit 151, the display on the liquid crystal panel 131 transitions to the main screen 140 (see Figure 10).

[0094] On the menu screen 160, one of several setting item display units (161, 162, 163) is selected. In the example shown in Figure 11, the third setting item display unit 163 is shown as selected. The liquid crystal panel 131 displays the selected state of a setting item display unit in a way that distinguishes it from the unselected state by making the selected state a brightly displayed area, a colored area, or a framed area. In the example shown in Figure 11, the unselected setting item display unit is colorless, while the selected state of a setting item display unit is displayed as a colored area.

[0095] On the menu screen 160, the selection of setting items is performed by operating the third operation display unit 153, which displays an "↑" symbol, and the fourth operation display unit 154, which displays a "↓" symbol. Operating the third operation display unit 153 moves the selection status display upwards, and operating the fourth operation display unit 154 moves the selection status display downwards.

[0096] In the crop type setting operation, the third setting item display unit 163 of "Crop Information Settings" is selected on the menu screen 160. The selection of the setting item display unit is confirmed by operating the fifth operation display unit 155, which displays the word "Confirm". By operating the fifth operation display unit 155 on the menu screen 160, the screen display on the LCD panel 131 transitions to the work information setting screen 170 (see Figure 12).

[0097] Figure 12 shows an example of the work information setting screen 170, which is one of the display screens on the liquid crystal panel 131 of the monitor 128. On the work information setting screen 170, the words "Work Information Setting" are displayed on the screen content display unit 157.

[0098] As shown in Figure 12, the work information setting screen 170 has multiple work information setting item display units (171, 172, 173) which are display units that display setting items for various work information related to the control of the combine harvester 1. In the example shown in Figure 12, the work information setting item display units are arranged from top to bottom as follows: the first work information setting item display unit 171 which displays the words "Crop Switching", the second work information setting item display unit 172 which displays the words "Sensor Settings", and the third work information setting item display unit 173 which displays the words "Yield Sensor Zero Point Calibration". These work information setting item display units are displayed in the same manner as the multiple setting item display units on the menu screen 160.

[0099] On the work information setting screen 170, the word "Back" is displayed on the first operation display unit 151. By operating the first operation display unit 151, the display on the liquid crystal panel 131 transitions to the menu screen 160 (see Figure 11).

[0100] On the work information setting screen 170, one of the multiple work information setting item display units (171, 172, 173) is selected. The selected work information setting item display unit is displayed in the same manner as on the menu screen 160. The selection of the work information setting item display unit is also performed by operating the third operation display unit 153 and the fourth operation display unit 154, in the same way as on the menu screen 160.

[0101] In the operation to set the crop type, the first work information setting item display unit 171 for "Crop Switching" is selected on the work information setting screen 170. The selection of the work information setting item display unit is determined by operating the fifth operation display unit 155, similar to the menu screen 160. By operating the fifth operation display unit 155 on the work information setting screen 170, the screen display on the liquid crystal panel 131 transitions to the crop switching screen 180 (see Figure 13).

[0102] Figure 13 shows an example of the crop switching screen 180, which is one of the display screens on the liquid crystal panel 131 of the monitor 128. On the crop switching screen 180, the words "Crop Switching" are displayed on the screen content display unit 157.

[0103] As shown in Figure 13, the crop switching screen 180 has multiple crop setting display units (181-185) which are display units that show the setting items for various crops that the combine harvester 1 is intended to harvest. In the example shown in Figure 13, the crop setting display units are arranged from top to bottom as follows: the first crop setting display unit 181 which displays the word "rice", the second crop setting display unit 182 which displays the word "wheat", the third crop setting display unit 183 which displays the word "corn", the fourth crop setting display unit 184 which displays the word "soybean", and the fifth crop setting display unit 185 which displays the word "other". These crop setting display units are displayed in the same manner as the multiple setting item display units on the menu screen 160.

[0104] On the crop switching screen 180, the word "Back" is displayed on the first operation display unit 151. By operating the first operation display unit 151, the screen display on the liquid crystal panel 131 transitions to the work information setting screen 170 (see Figure 12).

[0105] On the crop switching screen 180, one of the multiple crop display units (181-185) is selected. The selected crop display unit is displayed in the same manner as on the menu screen 160. The selection of the crop display unit is also performed by operating the third operation display unit 153 and the fourth operation display unit 154, as in the case of the menu screen 160.

[0106] On the crop switching screen 180, the type of crop to be harvested is selected. The selection of the set crop display unit is determined by operating the fifth operation display unit 155, similar to the menu screen 160. By operating the fifth operation display unit 155 on the crop switching screen 180, the display on the liquid crystal panel 131 transitions to the setting completion screen 190 (see Figure 14), indicating that the setting of the crop type has been completed. Here, we will explain the case where "soybean" is selected by the fourth set crop display unit 184.

[0107] Furthermore, the types and number of crops that can be selected on the crop switching screen 180 are not limited. In the example shown in Figure 13, four types of crops are displayed: "rice," "wheat," "corn," and "soybeans," but for example, there could be three types: "rice," "wheat," and "soybeans." Also, if the fifth setting crop display section 185 for "Other" is selected on the crop switching screen 180, the system may be configured to display a second crop switching screen that allows selection of multiple types of crops included in "Other."

[0108] Figure 14 shows an example of the setting completion screen 190, which is one of the display screens on the liquid crystal panel 131 of the monitor 128. On the setting completion screen 190, the words "Successful Completion" are displayed on the screen content display unit 157.

[0109] As shown in Figure 14, the setting completion screen 190 has a message display unit 191 that displays a message regarding the setting of the crop type. In the example shown in Figure 14, the message display unit 191 displays the words "The crop has been switched to soybeans," which means that "soybeans" has been set as the crop type.

[0110] On the setting completion screen 190, the first operation display unit 151 displays the word "Back". By operating the first operation display unit 151, the display on the LCD panel 131 transitions to the crop switching screen 180 (see Figure 13), allowing the user to select the crop type again. Also on the setting completion screen 190, the second operation display unit 152 displays the word "To Meter". By operating the second operation display unit 152, the display on the LCD panel 131 transitions to the main screen 140 (see Figure 10).

[0111] As described above, the type of crop is set by the monitor 128. Information about the set type of crop is sent to the control unit 120, stored in the memory unit 121, and displayed on the crop name display unit 147 of the main screen 140 (see Figure 10). In the example shown in Figure 10, the selected state of "soybeans" is shown. For example, if "wheat" is set by the setting of the type of crop by the monitor 128, that is, if the second set crop display unit 182 is selected on the crop switching screen 180, the word "wheat" will be displayed on the crop name display unit 147.

[0112] The control unit 120 uses information about the type of crop set by the monitor 128 to control the rotation of the threshing drum 41 (hereinafter referred to as "threshing drum rotation control"). In threshing drum rotation control, the control unit 120 uses the correspondence between the rotational speed of the engine 25 (hereinafter referred to as "engine rotational speed") and the rotational speed of the threshing drum 41 (hereinafter referred to as "rotor rotational speed"), which are set in advance for each type of crop.

[0113] Figure 15 shows an example of the correspondence between engine speed and rotor speed (hereinafter referred to as "speed correspondence") set for each crop type: rice, wheat, corn, and soybeans. In the graph shown in Figure 15, the horizontal axis represents engine speed (rpm), and the vertical axis represents rotor speed (rpm). In Figure 15, the first graph G1, shown as a solid line, represents the speed correspondence set for rice and wheat; the second graph G2, shown as a dashed line, represents the speed correspondence set for corn; and the third graph G3, shown as a dotted line, represents the speed correspondence set for soybeans.

[0114] The control unit 120 determines, based on the rotation speed correspondence relationship, whether the rotor rotation speed, which is the rotation speed of the threshing drum 41 detected by the threshing drum rotation sensor 125 (see Figure 8), matches the rotation speed correspondence relationship corresponding to the crop type set by the monitor 128 (hereinafter referred to as "monitor-set crop") (hereinafter referred to as "rotation speed matching determination"), and controls the display of the determination result of the rotation speed matching determination on the monitor 128. In other words, in this embodiment, the control unit 120 functions as a determination means that performs rotation speed matching determination and displays the determination result on the monitor 128.

[0115] The rotational speed correspondence used in the rotational speed matching control is the portion of the three graphs (G1, G2, G3) that corresponds to the first rotational speed range D1, which is the range from the first rotational speed E1 to the second rotational speed E2, where the engine speed is relatively stable. In the first rotational speed range D1, all three graphs (G1, G2, G3) show a proportional relationship, with the rotor rotational speed values ​​and slope values ​​decreasing in the order of the first graph G1 for rice and wheat, the second graph G2 for corn, and the third graph G3 for soybeans.

[0116] The following are specific numerical examples of the rotation speed correspondence shown in Figure 12. The first rotation speed E1 is 1300 (rpm), and the second rotation speed E2 is 2500 (rpm). The rotor rotation speed values ​​corresponding to the first rotation speed E1 are 369 (rpm) for rice and wheat in the first graph G1, 273 (rpm) for corn in the second graph G2, and 162 (rpm) for soybeans in the third graph G3. The rotor rotation speed values ​​corresponding to the second rotation speed E2 are 710 (rpm) for rice and wheat in the first graph G1, 525 (rpm) for corn in the second graph G2, and 311 (rpm) for soybeans in the third graph G3.

[0117] The rotation speed correspondence shown in Figure 12 is pre-set and stored in the memory unit 121 of the control unit 120. Note that the lower and upper limits of the first rotation speed range D1, and the rotor rotation speed values ​​for each crop type corresponding to the lower and upper limits, are not limited.

[0118] Regarding rotation speed matching determination, we will explain the case where the monitored crop is "soybean". In this case, as shown in Figure 15, when the engine speed is 2000 rpm, the rotor speed should be F1 rpm based on the third graph G3 (see point P1). However, when the engine speed is 2000 rpm, if the rotor speed detected by the threshing drum rotation sensor 125 is F2 rpm on the first graph G1, the rotation speed matching determination result will be "mismatched". On the other hand, when the engine speed is 2000 rpm, if the rotor speed detected by the threshing drum rotation sensor 125 is F1 rpm on the third graph G3, the rotation speed matching determination result will be "matched". Note that rotation speed F1 is approximately 250 rpm, and rotation speed F2 is approximately 575 rpm.

[0119] A "mismatch" result in the rotation speed matching determination is due to the monitoring setting crop being different from the type of crop corresponding to the speed change state of the threshing cylinder 41 operated by the threshing speed change lever 110 (see Figure 6). The example above is an example where the monitoring setting crop is "soybeans," but the speed change state of the threshing cylinder 41 by the threshing speed change device 58 is set to the high-speed state used for rice and wheat.

[0120] Regarding the display of the rotation speed matching determination result on the monitor 128, the control unit 120 displays an alarm on the monitor 128 if the rotor rotation speed detected by the threshing drum rotation sensor 125 does not match the rotation speed correspondence relationship corresponding to the monitor-set crop, that is, if the rotation speed matching determination result is "mismatched".

[0121] Specifically, if the rotational speed matching determination result is "mismatched", the control unit 120 displays an alarm screen 200 on the liquid crystal panel 131 of the monitor 128, for example, as shown in Figure 16. Figure 16 shows an example of an alarm screen 200, which is one of the display screens on the liquid crystal panel 131. On the alarm screen 200, the word "Alarm" is displayed on the screen content display unit 157.

[0122] As shown in Figure 16, the alarm screen 200 has an alarm message display unit 201 that displays an alarm message as a result of the rotation speed matching determination. In the example shown in Figure 16, the alarm message display unit 201 displays the words "The currently set crop does not match the speed change state of the threshing drum" as a display indicating that the result of the rotation speed matching determination is "mismatched." Note that the content displayed by the alarm message display unit 201 is not particularly limited. By operating the first operation display unit 151 which displays the word "Back" on the setting completion screen 190, the screen display on the liquid crystal panel 131 transitions to the main screen 140 (see Figure 10).

[0123] Furthermore, if the rotation speed matching determination result is "mismatched," the control unit 120 sends a control signal to the buzzer 129 to generate an alarm sound. In other words, if the rotation speed matching determination result is "mismatched," the control unit 120 displays an alarm screen 200 on the LCD panel 131 and generates an alarm sound from the buzzer 129. This alerts the operator. Upon recognizing the "mismatched" determination result, the operator can, for example, reset the speed change state of the threshing speed change device 58 by operating the threshing speed change lever 110 to a speed change state corresponding to the monitored crop.

[0124] On the other hand, in the case where the rotation speed matching determination result is "matched," the control unit 120 may be configured to display a message to that effect on the liquid crystal panel 131. When the determination result is "matched," for example, as shown in Figure 10, the word "matched" is displayed on the liquid crystal panel 131 in a predetermined location on the main screen 140. In the example shown in Figure 10, a matching result display unit 148 that displays the word "matched" is located near the top of the crop name display unit 147.

[0125] Furthermore, if the judgment result is "matched," the control unit 120 displays the set crop type (crop name) on the monitor 128, as shown in Figure 10, on the LCD panel 131. In the example shown in Figure 10, the crop name display unit 147 displays the word "soybean," which is the type of crop set on the monitor. In other words, if the judgment result of the rotation speed matching judgment is "matched," the display of the crop name on the crop name display unit 147, which displays the crop set on the monitor, will be maintained.

[0126] Furthermore, if the rotation speed matching determination result is "matched," the crop name may be displayed on the monitor 128 by blinking. That is, as the display control of the liquid crystal panel 131 when the determination result is "matched," the display of the crop name in the crop name display unit 147 may be made to blink, as shown in Figures 17A and 17B. Figure 17A shows the crop name display unit 147A with the word "soybean" turned off, and Figure 17B shows the crop name display unit 147B with the word "soybean" lit up. The manner in which the crop name is displayed by blinking in the crop name display unit 147 is not particularly limited. For example, the word "soybean" may be displayed by blinking the background portion of the crop name display unit 147.

[0127] Furthermore, if the rotation speed matching determination result is "matched," it corresponds to a normal rotation state of the sprocket 41. Therefore, as a control of the display content of the LCD panel 131, it is also possible to control the LCD panel 131 so that it does not display the determination result of the rotation speed matching determination. In other words, for the rotation speed matching determination, it is also possible to control the LCD panel 131 to display a message to that effect only if the determination result is "mismatched."

[0128] Furthermore, regarding the control of the rotational speed matching determination, the control unit 120 performs the rotational speed matching determination after a predetermined time has elapsed since the threshing clutch 57 entered the engaged state, in which power is transmitted to the threshing drum shaft 41a.

[0129] The control unit 120 detects that the threshing clutch 57 is engaged based on the detection signal from the threshing clutch sensor 126. Upon receiving the detection signal from the threshing clutch sensor 126, the control unit 120 measures the elapsed time since detecting that the threshing clutch 57 is engaged using a timer 122. When the elapsed time measured by the timer 122 reaches a predetermined time (for example, several seconds to several tens of seconds), the control unit performs rotation speed matching determination. This predetermined time is set in advance and stored in the memory unit 121 of the control unit 120.

[0130] An example of a control mode by the control unit 120 will be explained using the flowchart shown in Figure 18. Figure 18 is a flowchart showing an example of a control mode for rotational speed matching determination by the control unit 120. The control described below is performed by the CPU of the control unit 120 reading a predetermined control program stored in the RAM or the like of the storage unit 121 and executing it.

[0131] In controlling the rotation speed matching determination, the speed change state of the threshing drum 41 is set by operating the threshing speed change lever 110, and the crop type is set by the monitor 128 in advance.

[0132] As shown in Figure 18, first, a determination is made (S10) regarding the on / off state of the threshing clutch 57 detected by the threshing clutch sensor 126, specifically whether a predetermined time Δt has elapsed since the threshing clutch 57 entered the on state. This step S10 is to ensure sufficient time for the rotation of the threshing drum 41 to stabilize.

[0133] In step S10, if it is determined that a predetermined time Δt has elapsed since the timing of the threshing clutch 57 engaging (S10, Yes), the rotation of the threshing drum 41 is considered stable, and a determination is made in S20 as to whether the engine speed detected by the engine speed sensor 124 is within the range of the first rotation speed range D1 (see Figure 15). Since the range of engine speeds in the rotation speed correspondence relationship used in the rotation speed matching determination control is the first rotation speed range D1, it is a condition that the engine speed is within the range of the first rotation speed range D1 when controlling the rotation speed matching determination. On the other hand, in step S10, unless a predetermined time Δt has elapsed since the timing of the threshing clutch 57 engaging (S10, No), the rotation of the threshing drum 41 is considered unstable, and the determination in step S20 is not made.

[0134] In step S20, if it is determined that the engine speed is within the range of the first rotational speed range D1 (S20, Yes), the rotation of the engine 25 is considered stable, and a determination is made in S30 to see if the rotor speed detected by the threshing drum rotation sensor 125 matches the rotational speed correspondence relationship corresponding to the monitored crop. In this step, for example, if the monitored crop is "rice and wheat," it is determined whether the rotor speed detected by the threshing drum rotation sensor 125 is a value on the graph of the first graph G1 (see Figure 15), which is the rotational speed correspondence relationship for "rice and wheat." On the other hand, in step S20, unless the engine speed is within the range of the first rotational speed range D1 (S20, No), the rotation of the engine 25 is considered unstable, and the determination in step S30 is not made.

[0135] In step S30, if it is determined that the rotor rotation speed matches the rotation speed correspondence corresponding to the monitored crop (S30, Yes), the result of this determination is displayed on the monitor (S40). In this case, the result of the rotation speed matching determination is "Matched," and as a monitor display, for example as shown in Figure 10, the word "Matched" is displayed on the matching result display section 148 of the main screen 140 displayed on the liquid crystal panel 131. In this case, the display of the name of the monitored crop in the crop name display section 147 is maintained, and the display of the crop name in the crop name display section 147 may be displayed in a blinking manner (see Figures 17A and 17B).

[0136] On the other hand, if in step S30 it is determined that the rotor rotation speed does not match the rotation speed correspondence corresponding to the monitored crop (S30, No), an alarm is displayed and an alarm sound is emitted (S50). In this case, the result of the rotation speed matching determination is "mismatched", and an alarm screen 200, such as the one shown in Figure 16, is displayed on the LCD panel 131 of the monitor 128, and an alarm sound is emitted by the buzzer 129.

[0137] If the rotation speed matching determination result in step S30 is "mismatched", the rotor rotation speed will be a value on one of the two graphs other than the graph corresponding to the monitored crop, depending on the setting of the threshing cylinder 41's speed change state by operating the threshing speed change lever 110. In other words, as described above, in the example where the monitored crop is "rice / wheat", the rotor rotation speed detected by the threshing cylinder rotation sensor 125 will be a value on either the second graph G2 corresponding to "corn" or the third graph G3 corresponding to "soybeans", depending on the speed change state of the threshing cylinder 41.

[0138] Furthermore, the control unit 120 performs rotor rotation jamming control in addition to the rotation speed matching determination control described above, as threshing drum rotation control using the rotation speed correspondence relationship.

[0139] The control unit 120 performs rotor rotation jamming control, and based on the rotation speed correspondence, when the rotor rotation speed, which is the rotation speed of the threshing cylinder 41 detected by the threshing cylinder rotation sensor 125 (see Figure 8), falls below a threshold set in advance for each type of crop, it displays an alarm on the monitor 128.

[0140] The rotational speed correspondence used in rotor rotation jamming control is the portion of the three graphs (G1, G2, G3) where the engine speed value is smaller than the first rotational speed range D1, as shown in Figure 19. The second rotational speed range D2 is the range from the third rotational speed E3 to the first rotational speed E1. In the second rotational speed range D2, all three graphs (G1, G2, G3) show a proportional relationship, with the rotor speed value and slope value decreasing in the order of the first graph G1 for rice and wheat, the second graph G2 for corn, and the third graph G3 for soybeans.

[0141] The slopes of the three graphs (G1, G2, G3) in the second rotational speed range D2 are all greater than the slopes in the first rotational speed range D1. Therefore, all three graphs (G1, G2, G3) are curved at the position of the first rotational speed E1. In the example shown in Figure 19, the third rotational speed E3 is 1000 (rpm). Note that the lower and upper limits of the second rotational speed range D2 are not limited.

[0142] For rotor rotation jamming control, a predetermined rotor rotation speed value on the graph (G1, G2, G3) within the second rotation speed range D2 is set for each type of crop. Specifically, as shown in Figure 19, a first threshold H1 (see point P01) is set on the first graph G1, which is the threshold for rice and wheat; a second threshold H2 (see point P02) is set on the second graph G2, which is the threshold for corn; and a third threshold H3 (see point P03) is set on the third graph G3, which is the threshold for soybeans.

[0143] The threshold values ​​decrease in the order of the first threshold H1, the second threshold H2, and the third threshold H3. For example, the first threshold H1 for rice and wheat is 249 (rpm), the second threshold H2 for corn is 200 (rpm), and the third threshold H3 for soybeans is 150 (rpm).

[0144] Furthermore, in rotor rotation clogging control, an alarm release value is set, which is the rotor rotation speed value that cancels the alarm caused by the rotor rotation speed falling below a threshold. The alarm release value is set for each crop type as a predetermined rotor rotation speed value on the graph (G1, G2, G3) within the range of the second rotation speed range D2.

[0145] The magnitude of the alarm release threshold decreases in the order of rice / wheat, corn, and soybeans, similar to the thresholds mentioned above. For example, the alarm release threshold for rice / wheat is 269 rpm, for corn it is 225 rpm, and for soybeans it is 180 rpm.

[0146] Regarding rotor rotation jamming control, the rotor rotation speed threshold and alarm release value for each crop type are pre-set and stored in the storage unit 121 of the control unit 120. Note that the values ​​for the rotor rotation speed threshold and alarm release value are not limited to the examples described above.

[0147] In rotor rotation clogging control, the rotor rotation speed threshold and alarm release value are set according to the monitored crop. That is, for example, if the monitored crop is "rice and wheat," the rotor rotation clogging control uses the first threshold H1 as the threshold and the alarm release value for rice and wheat as the alarm release value. Therefore, in conjunction with the switching of the monitored crop, the threshold and alarm release value used in rotor rotation clogging control are switched to the threshold and alarm release value corresponding to the monitored crop.

[0148] Regarding rotor rotation jamming control, the case where the monitored crop is "rice / wheat" will be explained. In this case, during threshing, if the rotor rotation speed, which has risen to the rotation speed for threshing, drops to a rotation speed below the first threshold H1 (for example, 249 rpm), the control unit 120 displays an alarm on the monitor 128.

[0149] If the rotor speed drops below the first threshold H1 during threshing, it indicates that a problem such as a blockage of grain stalks has occurred in the threshing chamber 40. Therefore, the control unit 120 issues a blockage alarm when the rotor speed falls below the first threshold H1.

[0150] Specifically, the control unit 120 displays a rotor jamming alarm screen 210, such as the one shown in Figure 20, on the LCD panel 131 of the monitor 128 as a jamming alarm. Figure 20 shows an example of the rotor jamming alarm screen 210, which is one of the display screens on the LCD panel 131. On the rotor jamming alarm screen 210, the words "Rotor Jamming Alarm" are displayed on the screen content display unit 157.

[0151] As shown in Figure 20, the rotor jamming alarm screen 210 has an alarm message display unit 211 that displays a rotor jamming alarm message. In the example shown in Figure 20, the alarm message display unit 211 displays the words "The rotor speed is decreasing. Please reduce the speed." as an indication that the rotation speed of the threshing drum 41 is lower than normal. The content of the alarm message display unit 211 is not particularly limited. By operating the first operation display unit 151 which displays the word "Back" on the rotor jamming alarm screen 210, the screen display on the liquid crystal panel 131 transitions to the main screen 140 (see Figure 10).

[0152] Furthermore, the control unit 120 sends a control signal to the buzzer 129 to generate an alarm sound as a jamming alarm. In other words, when the rotor rotation speed falls below a threshold, the control unit 120 displays a rotor jamming alarm screen 210 on the LCD panel 131 and generates an alarm sound from the buzzer 129. This alerts the operator.

[0153] In rotor jamming control, the alarm is released when the rotor rotation speed detected by the threshing drum rotation sensor 125 exceeds the alarm release value. Specifically, following the example above, when the monitored crop is "rice / wheat," if the rotor rotation speed exceeds the alarm release value set for rice / wheat (for example, 269 rpm), the display on the rotor jamming alarm screen 210 on the liquid crystal panel 131 and the alarm sound from the buzzer 129 are stopped.

[0154] Furthermore, with respect to rotor rotation jamming control, the control unit 120, similar to the control for rotation speed matching determination, after a predetermined time has elapsed since the threshing clutch 57 was engaged, Rotor rotation jam control This may also be done. In this case, the control unit 120 performs rotor rotation jam control on the condition that a predetermined time (for example, several seconds to several tens of seconds) has elapsed since it detected that the threshing clutch 57 is in the engaged state.

[0155] Furthermore, the control unit 120 performs winnowing machine airflow control, which changes the airflow of the winnowing machine 47 according to the monitored crop, as a control using the monitored crop. Winnowing machine airflow control is a control that changes the magnitude of the airflow at each stage of the winnowing machine 47's airflow adjustment, which is adjusted in multiple stages using an operating device for adjusting the airflow of the winnowing machine 47, according to the type of monitored crop.

[0156] For adjusting the airflow of the winnowing machine 47, an airflow adjustment dial 300, including a rotatable dial, is provided on the lever column 24 of the operating unit 15 as an operating device for adjusting the airflow of the winnowing machine 47 (see Figure 8). The airflow adjustment dial 300 is connected to the control unit 120 via a sensor unit, and the rotation angle of the dial of the airflow adjustment dial 300 is detected by the sensor unit. The sensor unit inputs a detection signal regarding the rotation angle of the dial to the control unit 120. With the airflow adjustment dial 300, the airflow of the winnowing machine 47 can be adjusted in multiple stages, such as five stages, by rotating the dial.

[0157] The winnowing machine 47 has a winnowing shaft 47a, which is a rotation axis with the left-right direction as the axis of rotation, and a plurality of blades, and is located below the front of the threshing drum 41 (see Figure 1). The winnowing machine 47 is provided with an airflow control device (not shown) for adjusting the airflow of the winnowing machine 47. As an airflow control device, for example, a known configuration is used that includes a split pulley for changing the rotation speed of the winnowing shaft 47a, a cam mechanism for changing the width of the split pulley, a winnowing actuator 301 that operates the cam mechanism, and a transmission mechanism disposed between the cam mechanism and the winnowing actuator 301. The winnowing actuator 301 is made of an electric motor and is connected to a control unit 120, and its operation is controlled by the control unit 120 (see Figure 8).

[0158] According to the airflow control device, the operation of the cam mechanism accompanying the drive of the winnowing actuator 301 widens the belt groove width of the split pulley, thereby reducing the rotational radius of the belt wound around the split pulley. This increases the rotational speed of the winnowing shaft 47a, i.e., the rotational speed of the winnowing machine 47, and increases the airflow of the winnowing machine 47. On the other hand, the operation of the cam mechanism accompanying the drive of the winnowing actuator 301 narrows the belt groove width of the split pulley, thereby increasing the rotational radius of the belt wound around the split pulley. This decreases the rotational speed of the winnowing shaft 47a, i.e., the rotational speed of the winnowing machine 47, and reduces the airflow of the winnowing machine 47. little ru.

[0159] The control unit 120 adjusts the airflow of the winnowing machine 47 by driving the winnowing machine actuator 301 based on the operation of the airflow adjustment dial 300. Therefore, as winnowing machine airflow control using the monitored crop, the control unit 120 controls the airflow of the winnowing machine 47 at each stage of the airflow adjustment dial 300 according to the type of monitored crop.

[0160] According to the winnowing machine airflow control, the airflow of the winnowing machine 47 at each stage of the airflow adjustment dial 300 is adjusted so that the airflow of the winnowing machine 47 increases as the monitored crop is larger. In other words, the airflow at each stage adjusted by the airflow adjustment dial 300 increases in the order of "rice / wheat," "corn," and "soybeans."

[0161] Specifically, for example, in a configuration where the airflow can be adjusted using the airflow adjustment dial 300 in five stages from airflow "1" (low) to "5" (high), the airflow at each of the five stages is changed so that it increases in the order of "rice / wheat," "corn," and "soybeans," depending on the crop being monitored.

[0162] Therefore, when the monitored crop is switched, the control unit 120 adjusts the amount of control of the winnowing actuator 301 at each stage based on the detection signal from the sensor unit associated with the operation of the airflow adjustment dial 300 to an amount corresponding to the currently monitored crop. For example, regarding the airflow of the winnowing machine 47, the control unit 120 sets it to the standard airflow when the monitored crop is "rice / wheat", to a first strong airflow stronger than the standard airflow when the monitored crop is "corn", and to a second strong airflow stronger than the first strong airflow when the monitored crop is "soybeans".

[0163] As an example of how the winnowing machine 47's airflow can be changed, in the first strong airflow setting corresponding to "corn," the airflow levels "1," "2," and "3" adjusted by the airflow control dial 300 are controlled to correspond to the airflow levels "2," "3," and "4" adjusted by the airflow control dial 300 in the standard airflow setting corresponding to "rice and wheat." Furthermore, in the second strong airflow setting corresponding to "soybeans," the airflow levels "1," "2," and "3" adjusted by the airflow control dial 300 are controlled to correspond to the airflow levels "3," "4," and "5" adjusted by the airflow control dial 300 in the standard airflow setting corresponding to "rice and wheat."

[0164] According to the combine harvester 1 of this embodiment, which has the above configuration, it is possible to easily and in advance determine if there is an error in the speed setting of the threshing drum 41, to control the rotation state of the threshing drum 41 to a state suitable for the crop to be harvested, and to quickly detect any malfunction in the threshing drum 41.

[0165] The control unit 120 is configured to perform a rotation speed matching determination using the relationship between the monitored crop and the rotation speed, and to display the determination result on the monitor 128. With this configuration, if the speed setting of the threshing drum 41, set by operating the threshing speed change device 58 with the threshing speed change lever 110, differs from the monitored crop, the monitor 128 will notify the operator. Therefore, by setting the crop type on the monitor 128 in advance during harvesting, the operator can easily and in advance recognize any errors in the speed setting of the threshing drum 41.

[0166] This prevents the threshing drum 41 from continuing to operate at a rotation speed unsuitable for the crop being harvested, even if the operator is unaware of the speed setting of the threshing speed change device 58. This prevents clogging of grain stalks and damage to crops in the threshing chamber 40. Furthermore, because errors in the speed setting of the threshing drum 41 can be recognized in advance, changes in the rotation speed of the threshing drum 41 caused by problems such as clogging of grain stalks in the threshing chamber 40 or slippage of the threshing drum can be quickly detected as abnormalities in the rotation state of the threshing drum 41. This makes it possible to immediately recognize problems in the threshing drum 41.

[0167] Furthermore, during harvesting operations by the combine harvester 1, it is conceivable that the speed change state of the threshing drum 41 may be unexpectedly changed by some cause, such as an external force acting on the threshing speed change lever 110. In such cases, the rotation speed matching control will detect the mismatch between the monitored crop and the speed change state of the threshing drum 41, making it possible to detect an unintended change in the speed change state of the threshing drum 41.

[0168] Furthermore, the control unit 120 is configured to display the name of the monitored crop on the monitor 128 when the rotation speed matching determination result is "matched," and to issue an alarm via the display on the monitor 128 or the like when the determination result is "mismatched." With this configuration, the operator can be reliably informed of the determination result of the rotation speed matching determination.

[0169] Furthermore, as a display control when the rotation speed matching judgment result is "matched," the display of the name of the monitored crop on the liquid crystal panel 131 may be made to blink. With such a configuration, the visibility of the display of the name of the monitored crop on the liquid crystal panel 131 can be improved, and the operator in operation can be reliably informed that the judgment result is "matched."

[0170] Furthermore, the control unit 120 may be configured to issue an alarm, such as by displaying on the monitor 128, only if the rotation speed matching determination result is "mismatched". With such a configuration, it is possible to notify the operator of an error in the speed setting of the threshing drum 41, and if the determination result is "matched," that is, if the speed setting of the threshing drum 41 is correct in relation to the crop to be harvested, the impact on the operator from the rotation speed matching determination control can be eliminated. This ensures that the operator is reliably notified of an error in the speed setting of the threshing drum 41, and improves the accuracy of notifications to the operator from the rotation speed matching determination control.

[0171] Furthermore, the control unit 120 is configured to perform a rotational speed matching determination after a predetermined time has elapsed since the threshing clutch 57 was engaged. With this configuration, the rotational speed matching determination can be performed when the rotational speed of the threshing drum 41 is stable, thereby improving the accuracy of the determination by the rotational speed matching determination and enabling reliable recognition of errors in the speed setting of the threshing drum 41.

[0172] Furthermore, with a configuration that controls rotation speed matching determination, the type of crop can be set by the monitor 128 so that a "matching" determination result is obtained, thereby enabling the recognition of the gear shift of the threshing speed change device 58. This makes it possible to indirectly understand the gear shift of the threshing speed change device 58, that is, the gear shift status of the threshing drum 41, without having to provide a separate sensor to detect the gear shift of the threshing speed change device 58, and without the operator having to check the lever position of the threshing speed change lever 110, while remaining inside the cabin 16.

[0173] Furthermore, the control unit 120 is configured to perform rotor rotation jamming control using the relationship between the monitored crop and rotation speed. With this configuration, if the rotor rotation speed drops below a certain level according to the speed change state of the threshing drum 41, an alarm is issued by the monitor 128, etc. Therefore, it is possible to accurately detect rotor rotation jamming according to the type of crop to be harvested. In addition, if the control unit 120 is configured to perform rotor rotation jamming control after a predetermined time has elapsed since the threshing clutch 57 was engaged, it is possible to detect rotor rotation jamming caused by rotor rotation jamming control with even greater accuracy.

[0174] Furthermore, the control unit 120 is configured to perform winnowing airflow control, which changes the airflow of the winnowing machine 47 using the monitored crop setting. With this configuration, the airflow of the winnowing machine 47 can be adjusted using the airflow adjustment dial 300 to a level suitable for the crop being harvested, thereby improving the accuracy of grain sorting in the sorting unit 8.

[0175] As described above using the embodiments, the combine harvester according to the present invention is not limited to the embodiments described above, and various forms can be adopted within the scope consistent with the spirit of the present invention.

[0176] In the embodiment described above, the monitor 128 is configured to serve as both a display device and a setting device according to the present invention, but the display device and the setting device may also be configured as independent components of each other.

[0177] Furthermore, in the embodiment described above, the threshing speed change device 58 is configured to have three speed settings, but the number of speed settings of the threshing speed change device 58 is not limited. The threshing speed change device 58 may have a two-speed setting, or a setting with four or more speed settings. Depending on the number of speed settings of the threshing speed change device 58, the number of selectable crop types and the number of rotation speed correspondence relationships are set by the monitor 128 in the control by the control unit 120, such as the control for rotation speed matching determination and rotor rotation jamming control. This technology is preferably used in a configuration that includes a threshing speed change device 58 having three or more speed settings. [Explanation of symbols]

[0178] 1 combine harvester 3 Reaping section 7. Threshing section 8. Sorting Department 15. Driver's Unit 25 Engine (power source) 40 Handling room 41. 41a Handling trunk axis 47 Karawinoo 57 Threshing clutch 58 Threshing speed change device (speed change device) 59. Shaft input shaft 120 Control Unit 124 Engine speed sensor 125. Drum rotation sensor (rotation detection device) 126 Threshing clutch sensor 128 Monitor (display device, setting device) 129 Buzzer

Claims

1. A combine harvester that transports the stalks of grain harvested by the harvesting unit and supplies them to the threshing unit, A threshing drum is provided in the threshing chamber of the aforementioned threshing unit, rotatably supported by a threshing drum shaft, A transmission device having a threshold input shaft that rotates upon receiving power from a drive source and transmits rotational power to the threshold shaft, and configured to allow the rotational speed of the threshold to be set to multiple gears, A rotation detection device for detecting the rotational speed of the threshing drum, A control unit that receives the detection signal input from the rotation detection device, A display device whose display content is controlled by the control unit, The system includes a setting device that sends information regarding the type of crop set to the control unit, The control unit determines, based on the correspondence between the rotation speed of the drive source and the rotation speed of the threshing drum within a predetermined rotation speed range set in advance for each type of crop, whether the rotation speed of the threshing drum detected by the rotation detection device matches the correspondence corresponding to the type of crop set by the setting device, and displays the result of the determination on the display device. A combine harvester characterized by the following features.

2. The control unit, If the rotation speed of the threshing drum detected by the rotation detection device matches the correspondence corresponding to the crop type set by the setting device, the set crop type is displayed on the display device. If the rotation speed of the threshing drum detected by the rotation detection device does not match the correspondence corresponding to the crop type set by the setting device, the display device will display an alarm. The combine harvester as described in feature 1.

3. The control unit, when the rotation speed of the threshing drum detected by the rotation detection device matches the corresponding relationship for the crop type set by the setting device, will flash the crop type on the display device. The combine harvester according to feature 2.

4. The threshing clutch is provided for intermittently transmitting power from the drive source to the threshing shaft, The control unit performs the determination after a predetermined time has elapsed since the threshing clutch entered the engaged state, which transmits power to the threshing drum shaft. A combine harvester according to any one of claims 1 to 3.

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