JP2024049080A - combine - Google Patents

Abstract

[Problem] To provide a combine harvester that can easily and in advance determine an error in the speed setting of a threshing drum, can control the rotation state of the threshing drum to a state suitable for the crop to be harvested, and can quickly detect a defect in the threshing drum. [Solution] The combine harvester includes a threshing drum provided in a threshing chamber and supported rotatably by a threshing drum shaft, a speed change device having a threshing drum input shaft for transmitting rotational power to the threshing drum shaft and configured to be able to change the rotation speed of the threshing drum to a plurality of speed stages, a threshing drum rotation sensor 125, a control unit 120, and a monitor 128. The control unit 120 judges whether the rotation speed of the threshing drum detected by the threshing drum rotation sensor 125 is consistent with the correspondence relationship corresponding to the type of crop set by the monitor 128 based on the correspondence relationship between the engine speed and the rotor speed set in advance for each type of crop, and displays the judgment result on the monitor 128. [Selected Figure] Figure 8

Description

The present invention relates to a combine harvester equipped with a threshing drum whose rotation speed can be changed.

Conventionally, there are combine harvesters that are equipped with a threshing drum that is rotatably supported in the threshing chamber of the threshing section that threshes the stalks harvested by the harvesting section, and a speed change device for changing the rotation speed of the threshing drum, and that are configured to change the rotation speed of the threshing drum using the speed change device depending on the type of crop to be harvested, etc.

Regarding a combine harvester with such a configuration, Patent Document 1 describes a method of determining whether the speed change state of the threshing drum rotation speed is a high speed state or a low speed state, and displaying the result on a monitor located in front of the driver's seat. Specifically, Patent Document 1 describes a method of comparing the speed change state of the threshing drum determined based on the detection result of a rotation sensor that detects the rotation speed of the threshing drum with the speed change state of the speed change device set by operating an operating tool, and if the two match, the speed change state is displayed on the monitor, and if the two differ, the operator is notified of this fact by the monitor and a buzzer.

Patent No. 6647929

The conventional technology disclosed in Patent Document 1 displays on a monitor whether the rotation state of the threshing drum is in a high-speed or low-speed state based on whether the rotation state of the threshing drum detected by a rotation sensor matches or does not match the speed change state set by the speed change device.

For this reason, for example, if an operator does not understand the speed change setting of the transmission and fails to check the monitor display while working, there is a risk that the threshing drum will continue to rotate at a speed that is not suitable for the crop being harvested. A threshing drum that is not suitable for the crop being harvested can cause the stalks to become clogged in the threshing chamber or damage to the crop.

In addition, with conventional technology, for example, a change in the rotation speed of the threshing drum caused by a malfunction such as a blockage of straw in the threshing chamber or a slippage of the threshing drum may not be detected as an abnormality in the rotation state of the threshing drum when compared with the speed change state set by the speed change device. In such cases, there is a problem that it becomes difficult to immediately recognize a malfunction in the threshing drum.

The present invention was made in consideration of the above problems, and aims to provide a combine harvester that can easily and in advance determine if the threshing drum's speed setting is incorrect, can control the rotation state of the threshing drum to a state suitable for the crop to be harvested, and can quickly detect any malfunctions in the threshing drum.

The combine harvester according to the present invention is a combine harvester that transports stalks harvested by a harvesting section and supplies them to a threshing section, and is equipped with a threshing drum that is rotatably supported by a threshing drum shaft in the threshing section, a threshing drum input shaft that receives power from a drive source to rotate and transmits rotational power to the threshing drum shaft, a speed change device that is configured to be able to change the rotation speed of the threshing drum to a plurality of speed stages, a rotation detection device that detects the rotation speed of the threshing drum, a control unit that receives an input of a detection signal from the rotation detection device, a display device that is provided in the driving section and whose display content is controlled by the control unit, and a setting device that sends information about the type of crop set by input operation to the control unit to set the type of crop to be harvested, and the control unit determines whether the rotation speed of the threshing drum detected by the rotation detection device matches the correspondence relationship corresponding to the type of crop 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 that is set in advance for each type of crop, and displays the result of the determination on the display device.

In another aspect of the combine harvester of the present invention, the control unit displays the type of crop set on the display device when the rotation speed of the threshing drum detected by the rotation detection device matches the correspondence relationship corresponding to the type of crop set by the setting device, and displays an alarm on the display device when the rotation speed of the threshing drum detected by the rotation detection device does not match the correspondence relationship corresponding to the type of crop set by the setting device.

In another aspect of the combine harvester of the present invention, the control unit causes the display device to flash the type of crop when the rotation speed of the threshing drum detected by the rotation detection device matches the correspondence relationship corresponding to the type of crop set by the setting device.

In another aspect of the combine harvester of the present invention, the combine harvester is provided with a threshing clutch for interrupting the transmission of power from the drive source to the threshing shaft, and the control unit makes the determination a predetermined time after the threshing clutch is turned on to transmit power to the threshing shaft.

According to the present invention, it is possible to easily and in advance determine whether the speed setting of the threshing drum is incorrect, and the rotation state of the threshing drum can be controlled to a state suitable for the crop to be harvested, and defects in the threshing drum can be quickly detected.

FIG. 2 is a left side view of a combine harvester according to one embodiment of the present invention. FIG. 2 is a right side view of a combine harvester according to one embodiment of the present invention. FIG. 1 is a plan view of a combine harvester according to one embodiment of the present invention. FIG. 2 is a diagram showing a power transmission configuration in a combine harvester according to one embodiment of the present invention (transmission mechanism diagram). FIG. 5 is a diagram showing the configuration of a threshing speed change device according to one embodiment of the present invention (a partially enlarged view of FIG. 4). FIG. 2 is a plan view showing the arrangement of a threshing transmission according to one embodiment of the present invention. FIG. 2 is an explanatory diagram of the operation of a threshing transmission according to one embodiment of the present invention. 2 is a block diagram showing a control configuration of a combine harvester according to one embodiment of the present invention. FIG. FIG. 2 is a diagram showing a monitor arrangement according to an embodiment of the present invention; FIG. 4 is a diagram showing an example of a main screen displayed on a monitor according to an embodiment of the present invention. FIG. 4 is a diagram showing an example of a menu screen displayed by a monitor according to an embodiment of the present invention. FIG. 13 is a diagram showing an example of a work information setting screen displayed on a monitor according to an embodiment of the present invention. FIG. 13 is a diagram showing an example of a crop switching screen displayed by a monitor according to an embodiment of the present invention. FIG. 13 is a diagram showing an example of a setting end screen displayed on the monitor according to the embodiment of the present invention. FIG. 4 is a diagram showing an example of the relationship between the engine rotation speed and the rotor rotation speed for each type of crop according to one embodiment of the present invention. FIG. 13 is a diagram showing an example of a warning screen displayed by a monitor according to an embodiment of the present invention. FIG. 13 is a diagram showing an example of a display mode of a crop name display section on a main screen displayed by a monitor according to an embodiment of the present invention. 5 is a flowchart showing an example of a control mode performed by a control unit according to an embodiment of the present invention. FIG. 4 is a diagram showing an example of the relationship between the engine rotation speed and the rotor rotation speed for each type of crop according to one embodiment of the present invention. FIG. 13 is a diagram showing an example of a rotor clogging warning screen displayed by a monitor according to an embodiment of the present invention.

The present invention determines whether the rotation speed of the threshing drum, which can be set to a rotation speed corresponding to the type of crop to be harvested, is a rotation speed corresponding to the type of crop to be harvested based on the correspondence with the rotation speed of the drive source, and displays the determination result on a display device. With this configuration, the present invention aims to make it possible to quickly identify errors in the threshing drum speed setting and malfunctions in the threshing drum. The following describes an embodiment of the present invention.

[Overall configuration of combine harvester]
First, the overall configuration of a combine harvester 1 according to this embodiment will be described with reference to 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) facing the front of the combine harvester 1 are respectively the left side and the right side of the combine harvester 1.

As shown in Figures 1 and 2, the combine harvester 1 according to this embodiment is a normal type combine harvester that rakes in harvested crops from a field into the machine body, threshes, sorts, stores the grains, and can be transported outside the machine as needed. The combine harvester 1 has a self-propelled running body 2 and a reaping unit 3 provided at the front end of the running body 2. The reaping unit 3 is configured as a reaping device that harvests and collects unharvested stalks of rice, wheat, etc., and is attached to the running body 2 so that it can be raised and lowered.

The traveling body 2 is equipped with a traveling section 4 configured as a crawler-type traveling 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 multiple rotating bodies including a drive sprocket 5a provided at its front end and a tension roller 5b provided at the rear end of the crawler section 5, and a track 5c wound around these rotating bodies. The multiple rotating bodies constituting the crawler section 5 are provided on a track frame 5d provided on the underside of the traveling body 2. In addition, the drive sprocket 5a is rotated by receiving power transmitted from an engine 25, which is a drive source provided in the combine 1.

On the left side of the machine frame 6, there is a threshing section 7 that threshes the stalks harvested and supplied by the harvesting section 3, and a sorting section 8 that sorts the grains threshed by the threshing section 7. The threshing section 7 and the sorting section 8 are arranged with the threshing section 7 on the upper level and the sorting section 8 on the lower level.

On the machine frame 6, to the right of the threshing section 7 and the sorting section 8, there is provided a grain storage section 9 having a grain tank 10 for storing the grains (clean grains) sorted in the sorting section 8. Inside the grain tank 10, there is provided a lower discharge conveyor 11 for transporting the stored grains toward the discharge outlet of the grain tank 10 (see FIG. 4). A vertical transport conveyor 12 is erected in the vertical direction so as to communicate with the discharge outlet of the grain tank 10. A grain discharge conveyor 13 is connected to the upper end of the vertical transport conveyor 12. The grain discharge conveyor 13 is arranged so as to be able to rotate horizontally and swing up and down around a horizontal axis. These conveyors transport the grains in the grain tank 10, and the grains are discharged from a rice husk inlet 14 at the tip of the grain discharge conveyor 13 into a truck bed, a container, or the like.

In addition, a driver's section 15, in which an operator sits, is provided on the machine frame 6 in front of the grain storage section 9, that is, at the front right side of the machine frame 6. The driver's section 15 is covered by a cabin 16. The driver's section 15 is provided with a driver's seat 17, a steering wheel 18 arranged in front of the driver's seat 17, a main speed change lever 21, an auxiliary speed change lever 22, a work clutch lever 23, etc. The work clutch lever 23 is a work operating tool for switching on and off the threshing clutch 57 and the reaping clutch 75 (see Figure 4). The main speed change lever 21, the auxiliary speed change lever 22, and the work clutch lever 23 are arranged on a lever column 24 provided on the left side of the driver's seat 17.

An engine 25 is provided behind the grain storage section 9 on the traveling machine body 2 as a drive source. 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 collects particulate matter, mainly black smoke, in the exhaust gas emitted from the engine 25. The engine 25 purifies the exhaust gas by passing the exhaust gas through the DPF 26.

The following describes the harvesting unit 3. The harvesting unit 3 has a feeder 30 as a transport device, a grain header (platform) 31, a cutting blade device 32, a pair of left and right grass dividing bodies 33, 33, and a raking reel 34.

The feeder 30 is a transport device that transports the stalks harvested by 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 the stalks that is provided within the feeder house 35. The feeder 30 is located to the left of the cabin 16, and is provided with a rear end opening of the feeder house 35, which is configured as a roughly rectangular cylinder with the longitudinal direction in a plan view as the front-to-rear direction, connected to the front handling port 7a of the threshing section 7.

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 raking auger (platform auger) 37 is provided within the grain header 31. The raking auger 37 is mounted on a shaft that can rotate with the left-right direction as the rotation axis direction.

The cutting blade device 32 is provided at the front lower edge of the grain header 31 and is configured like a clipper. A pair of left and right grass dividing bodies 33, 33 are provided so as to protrude forward from the front left and right sides of the grain header 31. The raking reel 34 is a reel with a tine bar and is provided at a position above the raking auger 37. The raking reel 34 is supported between the tips of a pair of left and right reel support arms 34a, 34a whose base ends are pivoted to the grain header 31 so as to be rotatable with the left and right direction as the rotation axis. The raking reel 34 acts continuously on the pod-bearing part of the stalk while rotating, and raking the pod-bearing part of the stalk into the raking auger 37. The power of the engine 25 transmitted via various transmission mechanisms is used to operate each part of the reaping unit 3.

The conveyor 36 in the feeder house 35 has a reaping input shaft (feeder house conveyor shaft) 38, which is installed in front of the threshing unit 7 and has an axial direction in the left-right direction as a drive shaft that supports the feeding end side. The rear end of the feeder 30 is supported by the reaping input shaft 38 so that it can rotate with the axial direction in the left-right direction. In addition, a lifting cylinder 39 is interposed between the bottom surface of the feeder house 35 and the machine frame 6. The extension and contraction of the lifting cylinder 39 causes the reaping unit 3 to rise and fall with the reaping input shaft 38 as a pivot shaft. The lifting and lowering operation of the reaping unit 3 is operated by a specified operating unit installed in the driving unit 15.

The threshing section 7 and the sorting section 8 will now be described. The threshing section 7 has a threshing drum 41 installed in a threshing chamber 40 with a threshing port 7a opening to the front, and a receiving net 42 arranged below the threshing drum 41. The threshing drum 41 is installed in the threshing chamber 40 and rotatably supported by a threshing drum shaft 41a whose axial direction is the front-to-rear direction.

The threshing drum 41 has a cylindrical main body with the threshing drum shaft 41a aligned along the central axis, and the outer circumferential surface of the main body is provided with spiral blades. On the upper side of the threshing drum 41, multiple dust-transport valves are provided with adjustable angles to adjust the transport speed (retention time) of the grains in the threshing chamber 40. The receiving net 42 allows the grains to escape, and is provided along the outer circumferential surface of the lower part of the threshing drum 41.

The sorting section 8 has a swaying sorting plate 43 as a swaying section arranged below the receiving net 42, a rocking mechanism 44 including a rocking shaft 44a that rocks the swaying sorting plate 43 by rotational power from a drive source, a first conveyor 45, a second conveyor 46, and a winnower 47. As shown in FIG. 4, a pre-fan 71 is provided in front of the winnower 47, and a second fan 72 is provided behind the winnower 47.

The oscillating sorting plate 43 has a configuration for gravity sorting, including a feed pan, a chaff sieve located behind the feed pan to adjust the amount of grain leakage, and a grain sieve located below the chaff sieve. The first conveyor 45 is located in the first trough extending in the width direction of the machine so as to collect the first grains. The second conveyor 46 is located behind the first conveyor 45 in the second trough extending in the width direction of the machine so as to collect the second grains. The winnower 47 blows sorting air from the front lower to the rear upper to the oscillating sorting plate 43.

A return conveyor 48 is provided on the left side of the machine body where the threshing section 7 and sorting section 8 are located. The return conveyor 48 is connected to the second conveyor 46 with its lower end located near the second conveyor 46, and its upper end located near the front end of the threshing drum 41, extending in an upward sloping manner. An upper conveyor 49 (see Figure 4) is provided at the upper end of the return conveyor 48, extending left and right in front of the threshing drum 41.

The combine harvester 1 configured as described above raises the cutting section 3 to a desired height above the ground (the cutting height of the culms, which are the harvested crop) in the field by raising and lowering the feeder 30 supported by the cutting input shaft 38, changes from a non-working state to a working state, and travels in this state using the traveling body 2. As a result, the combine harvester 1 divides the harvested crop into cutting targets and non-cut targets using the left and right dividing bodies 33, 33, and cuts the pod-bearing parts of the culms with the cutting blade device 32 while raking in the pod-bearing parts on the tip side of the culms to be cut with the raking reel 34.

The pods of the stalks cut at the desired cutting position are scraped into the grain header 31 by the rotating scraping auger 37 and collected near the entrance of the feeder house 35 in the center of the left and right of the grain header 31. The pods are then fed through the feeder house 35 by the conveyor 36 inside the feeder house 35 into the threshing opening 7a and supplied to the threshing section 7. In this way, the combine 1 is configured to transport the stalks cut by the cutting section 3 and supply them to the threshing section 7.

The pod-bearing portion of the stalks supplied to the threshing section 7 is threshed by the threshing section 7. Specifically, the stalks supplied to the threshing section 7 are transported rearward by the rotating threshing drum 41 and threshed mainly between the threshing drum 41 and the receiving net 42. Grains and other threshed grains that are smaller than the mesh size of the receiving net 42 leak through the receiving net 42. Straw chips and other debris that do not leak through the receiving net 42 are discharged into the field from a dust outlet provided at the rear of the sorting section 8 by the transport action of the threshing drum 41.

Meanwhile, the grains that have been threshed in the threshing section 7 and that have fallen through the receiving net 42 are sorted by the sorting section 8. Specifically, the threshed grains that have been threshed in the threshing drum 41 and that have fallen through the receiving net 42 are sorted by the gravity sorting action of the oscillating sorting plate 43 and the wind sorting action of the winnowing machine 47 into refined grains and other grains (first grain), a mixture of grains and straw, such as grains with stalks (second grain), and straw chips, etc., and are removed.

The first grain (grain) 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 lifting conveyor (not shown) connected to it. The second grain is returned to the threshing start end of the threshing drum 41 by the second conveyor 46 and the return conveyor 48 and upper conveyor 49 connected to it, and is threshed again. Straw chips and the like are discharged into the field from a dust outlet provided at the rear of the sorting section 8.

Next, the power transmission configuration of the combine harvester 1 according to this embodiment will be described with reference to FIG. 4. The combine harvester 1 drives the harvesting section 3, the traveling section 4, the threshing section 7, the sorting section 8, and the grain storage section 9 using the rotational power of the engine 25.

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. On the other hand, the rotational power of the engine 25 is transmitted to the lower discharge conveyor 11, the vertical transport conveyor 12, and the grain discharge conveyor 13 via an auger clutch 53. The engine 25 has a work machine pump shaft 25b that drives a charge pump 54 that operates the lifting cylinder 39, etc.

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 to the threshing section 7 and a power transmission system to the running section 4, sorting section 8, and harvesting section 3.

Regarding the power transmission system to the threshing section 7, the rotational power of the first countershaft 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 countershaft 51 to the first rotor drive shaft 56 intermittently as desired.

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 transmission 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. In this way, the combine harvester 1 is equipped with a threshing clutch 57 for interrupting the transmission of power from the engine 25 to the threshing drum shaft 41a.

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

Regarding the power transmission system to the traveling unit 4, the rotational power of the first countershaft 51 is transmitted to the second countershaft 62 by the fourth belt transmission mechanism 61. The rotational power of the second countershaft 62 is transmitted to the HST input shaft 64 via the fifth belt transmission mechanism 63, and input to the transmission 65 including the traveling HST and the turning HST by the HST input shaft 64. 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 power by a hydraulic motor. The driving force of the transmission 65 rotates and drives the drive sprocket 5a of the crawler unit 5 that constitutes the traveling unit 4.

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 and the like. The rotational power of the second PTO drive shaft 69 is transmitted to the pre-fan shaft 71a that rotates the pre-fan 71, the winnowing shaft 47a that rotates the winnowing machine 47, and the first conveyor shaft 45a that rotates the first conveyor 45, respectively, by a predetermined transmission mechanism. In addition, the rotational power of the second PTO drive shaft 69 is transmitted to the swing shaft 44a of the swing mechanism 44 via the first conveyor shaft 45a. In addition, the rotational power of the first conveyor shaft 45a is transmitted to the second fan shaft 72a that rotates the second fan 72, by a predetermined transmission mechanism.

The rotational power of the swing shaft 44a is transmitted to the second conveyor shaft 46a, which rotates the second conveyor 46, via a specified transmission mechanism. The rotational power of the second conveyor shaft 46a is transmitted to the vertical conveyor shaft 48a, which rotates the return conveyor 48, via a specified transmission mechanism, and the rotational power of the vertical conveyor shaft 48a is transmitted to the horizontal conveyor shaft 49a, which rotates the upper conveyor 49, via a specified transmission mechanism.

Regarding the power transmission system to the reaping unit 3, the rotational power of the second PTO drive shaft 69 is transmitted to the reaping input shaft 38 by the seventh belt transmission mechanism 73. The conveyor 36 in the feeder house 35 is operated by the rotational drive of the reaping input shaft 38. The seventh belt transmission mechanism 73 is provided with a reaping clutch 75 that transmits the rotational power of the second PTO drive shaft 69 to the reaping input shaft 38 intermittently as desired.

The rotational power of the cutting 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 that 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 that drives the cutting blade device 32 via the eighth belt transmission mechanism 80. The rotational power of the PF drive shaft 77 is also transmitted to the reel shaft 34b that rotates the raking reel 34 by a power transmission mechanism including the first reel counter shaft 81 and the second reel counter shaft 82.

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

The combine harvester 1 according to this embodiment, which has the above-mentioned configuration, has the following configuration with respect to the speed change control of the rotation speed of the threshing drum 41 by the threshing speed change device 58 as a speed change device.

First, the threshing speed change device 58 will be described with reference to Figures 5 to 7. The threshing speed change device 58 has a threshing drum input shaft 59 that receives power from the engine 25, rotates, and transmits rotational power to the threshing drum shaft 41a, and is a speed change device configured to be able to change the rotation speed of the threshing drum 41 to multiple speed change 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 be able to change the rotation speed of the threshing drum 41 to three speed change stages: low-speed stage, medium-speed stage, and high-speed stage.

As shown in FIG. 5, the threshing speed change device 58 has a threshing drum input shaft 59 arranged with its axial direction in the longitudinal direction of the machine body, and a counter shaft 90 arranged below the threshing drum input shaft 59 and parallel to the threshing drum input shaft 59. The counter shaft 90 receives the rotational power of 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 arranged with its axial direction in the transverse 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.

A pulley 94 that constitutes the second belt transmission mechanism 55 (see FIG. 4) in which the threshing clutch 57 is located is fixed to the right end of the first rotor drive shaft 56. In addition, pulleys 85, 86 that 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.

As shown in FIG. 5, the threshing speed change device 58 has a combination of a pair of gears supported on each shaft between the counter shaft 90 and the threshing drum input shaft 59 and capable of meshing with each other, including low-speed gears (101, 102) forming a low-speed gear train, medium-speed gears (103, 104) forming a medium-speed gear train, and high-speed gears (105, 106) forming a high-speed gear train. These gear trains are arranged from the front to the rear in the order of low-speed gear train, medium-speed gear train, and high-speed gear train. The various gears and the like that make up the threshing speed change device 58 are housed in the housing 95 of the threshing speed change device 58 (see FIG. 6).

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 axially positioned relative to the threshing drum input shaft 59. The first low-speed gear 101 and the second low-speed gear 102 are constantly in mesh.

Of the pair of medium-speed gears, the first medium-speed gear 103, which is the medium-speed gear 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 the high-speed gear 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.

On the other hand, the second medium speed gear 104, which is a medium speed gear provided on the input shaft 59 side and has a smaller diameter than the second low speed gear 102, and the second high speed gear 106, which is a high speed gear provided on the input shaft 59 side and has a smaller diameter than the second medium speed gear 104, constitute an integral slider gear 107 provided on the input shaft 59. The second medium speed gear 104 is provided in front of the slider gear 107, and the second high speed gear 106 is provided in the rear of the slider gear 107. The slider gear 107 is supported by a spline engagement or the like so that it can slide axially relative to the input shaft 59 but cannot rotate relative to it.

The slider gear 107 moves on the axis of the handling 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 handling drum input shaft 59. The slider gear 107 has an outer peripheral gear portion 107a on the front side for engaging with the second low-speed gear 102. Meanwhile, the second low-speed gear 102 has an inner peripheral gear portion 102a on the rear side that meshes with the outer peripheral gear portion 107a. The outer peripheral gear portion 107a meshes with the inner peripheral gear portion 102a in a fitted manner as the slider gear 107 slides forward.

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

The operating shaft 112 is provided so as to be rotatable with the vertical direction as the axial direction. The operating shaft 112 is interlocked with a shift fork (not shown) within the housing 95 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 together with the slider gear 107. The rotational movement of the operating shaft 112 is transmitted as a sliding movement of the slider gear 107 on the handling drum input shaft 59 via the connecting operating member and the shift fork.

As shown in FIG. 6, the threshing speed changer 58 is disposed to the right of the rear of the right side wall 40a forming the threshing chamber 40 that houses the threshing drum 41. In the housing 95 of the threshing speed changer 58, the front part of the threshing drum input shaft 59 and the counter shaft 90 are disposed vertically in parallel and are supported rotatably via bearings. On the front side of the housing 95, a bevel case 96 is provided that houses the first bevel gear 91 and the second bevel gear 92 as well as the shaft parts that support them. The right end of the first rotor drive shaft 56 protrudes from the bevel case 96 to the right, and a pulley 94 is fixed to the protruding part of the first rotor drive shaft 56. In addition, on the rear side of the housing 95, a cylindrical shaft case 97 is provided in which the threshing drum input shaft 59 extending rearward from the housing 95 is housed. The rear end of the threshing drum input shaft 59 protrudes rearward from the shaft case 97, and a pulley 85 is fixed to the protruding part of the threshing drum input shaft 59.

The pivoting operation arm 111 extends so that its tip, which is connected to the threshing speed change lever 110, is positioned to the left of the operation shaft 112. The front end of the threshing speed change lever 110 is connected to the tip of the pivoting operation arm 111 by a support part 113 so that it can rotate with the axial direction being the up-down direction. The threshing speed change lever 110 has a bent part 110a in which the front end is bent at a right angle toward the left side. In the left-right direction, the front end of the threshing speed change lever 110 is positioned between the operation shaft 112 and the support part 113, and the tip of the bent part 110a is supported by the support part 113 on the tip of the pivoting operation arm 111.

The threshing speed change lever 110 extends toward the rear of the machine body in the approximately fore-and-aft direction, and the other end, the rear end, is located rearward of the third belt transmission mechanism 60, which is located at the rear of the handling chamber 40 in the fore-and-aft direction. The rear end of the threshing speed change lever 110 is bent at a right angle, for example, toward the upper side, to form a grip portion 110b.

To change the speed of the threshing speed change device 58, the threshing speed change lever 110 is pushed and pulled back and forth while gripping the gripping portion 110b (see arrow A1 in Figure 6). By pushing and pulling the threshing speed change lever 110 back and forth, the pivoting operation arm 111 located to the left of the operation shaft 112 rotates integrally with the operation shaft 112 so as to move its tip back and forth (see arrow A2 in Figure 6). This causes the slider gear 107 to slide in the threshing speed change device 58, and the speed change operation of the threshing speed change device 58 is performed.

According to the arrangement of the threshing speed change lever 110 in this embodiment, the threshing speed change lever 110 is operated from the rear side of the traveling body 2. The arrangement of the threshing speed change lever 110 is not limited, and the position at which the threshing speed change lever 110 can be changed as appropriate depending on the position of the threshing speed change lever 110.

As shown in FIG. 6, of the three speed stages of the threshing speed change device 58, the first rotation position P1, where the tip of the pivot arm 111 is positioned at the most forward position, corresponds to the low-speed stage (hereinafter referred to as the "low-speed state"). The first rotation position P1 is a position where the extension direction of the pivot arm 111 forms an angle of approximately 50° forward with respect to the left-right direction (up-down direction in FIG. 6).

Of the three gear shift stages, the second rotation position P2 of the pivot operation arm 111, which is a rotation position where the tip of the pivot operation arm 111 is positioned forward of the operation shaft 112 and rearward of the first rotation position P1, corresponds to the medium gear shift state (hereinafter referred to as the "medium gear state"). The second rotation position P2 is a position where the extension direction of the pivot operation arm 111 forms an angle of approximately 20° forward with respect to the left-right direction. In FIG. 6, the state where the pivot operation arm 111 is positioned at the second rotation position P2 is shown by a dashed line.

Of the three gear shift stages, the third rotation position P3, where the pivot arm 111 is positioned so that its tip is positioned rearward of the operating shaft 112, corresponds to the high-speed gear shift state (hereinafter referred to as the "high-speed state"). The third rotation position P3 is a position where the angle that the pivot arm 111 extends to the left and right is approximately 20° rearward. In FIG. 6, the state in which the pivot arm 111 is positioned at the third rotation position P3 is indicated by a two-dot chain line.

The power transmission path in each speed change state of the threshing speed change device 58 is as follows. As shown in FIG. 7A, in the threshing speed change device 58 in the low-speed state, 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 peripheral gear portion 107a with the inner peripheral 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 to the threshing drum input shaft 59 in the axial rotation direction and transmit the rotation of the second low-speed gear 102 to the threshing drum input shaft 59.

As shown in FIG. 7B, in the threshing speed change device 58 in the medium speed state, the slider gear 107 is located in the front-rear middle part on the threshing drum input shaft 59 with the second low speed gear 102 disengaged, and the second medium speed gear 104 is meshed 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).

As shown in FIG. 7C, in the high-speed state of the threshing speed change device 58, the slider gear 107 is located on the threshing drum input shaft 59 rearward of 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).

An example of the correspondence between each speed change state of the threshing drum 41 by the threshing speed change device 58 and the type of crop to be harvested by the combine harvester 1 is as follows: The low speed state is used when the crop to be harvested is soybeans, a relatively large grain, the medium speed state is used when the crop to be harvested is corn, a relatively small grain, and the high speed state is used when the crop to be harvested is even smaller grains such as rice and wheat. However, the correspondence between the speed change state of the threshing speed change device 58 and the type of crop is not particularly limited.

Next, the control configuration of the combine harvester 1 will be described with reference to FIG. 8. As shown in FIG. 8, the combine harvester 1 includes a control unit 120. The control unit 120 controls each unit of the combine harvester 1 based on input signals from various sensors and the like included in the combine harvester 1.

The control unit 120 is composed of a CPU (Central Processing Unit) as an arithmetic processing device that executes various arithmetic processing and control, a memory unit 121 composed of storage devices such as RAM (Random Access Memory) and ROM (Read Only Memory), an input/output device (input/output circuit) such as an input/output interface for data input/output, and a control device having a configuration in which peripheral circuits such as a clock circuit are connected by a bus or the like. The CPU of the control unit 120 performs arithmetic processing according to various programs stored in the memory unit 121. The control unit 120 also has a timer 122 for measuring time.

As shown in FIG. 8, the combine harvester 1 has an engine rotation sensor 124 that detects the rotation speed of the engine 25, a threshing drum rotation sensor 125 as a rotation detection device that detects the rotation speed of the threshing drum 41, and a threshing clutch sensor 126 that detects the on/off state of the threshing clutch 57, all of which are electrically connected to the input device (input circuit) of the control unit 120. The control unit 120 receives signals from these sensors and generates control signals based on these signals.

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

The combine harvester 1 has a monitor 128 that functions as a display device and a setting device, and a buzzer 129 that generates an alarm sound, 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 generated control signal. 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.

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

The monitor 128 is provided in the driver's section 15 in the cabin 16. As shown in Figs. 3 and 9, the monitor 128 is provided in the driver's section 15 in a portion of the steering wheel 18 located in front of the driver's seat 17. Specifically, as shown in Fig. 9, the steering wheel 18 has an annular steering wheel main body 18A, and the monitor 128 is provided in the center of the inside of the steering wheel main body 18A. The monitor 128 is provided in a fixed position so that the display orientation remains constant regardless of the operation of the steering wheel 18, such as the rotation of the steering wheel main body 18A.

The monitor 128 is a liquid crystal monitor with a touch panel function, and the display content is controlled by the control unit 120. The monitor 128 is a display unit that displays various statuses of the combine harvester 1 to the operator, etc. As shown in FIG. 9, the monitor 128 has a liquid crystal panel 131, which is a rectangular display screen, and a plurality of command buttons 132 as operation buttons.

The liquid crystal panel 131 is disposed in the center of the front of the monitor 128, and is provided so that most of the front of the monitor 128 is used as a display area. 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. Note that the liquid crystal panel 131 does not have to be a touch panel.

The multiple command buttons 132 are arranged in the area surrounding the monitor 128 on the front side of the monitor 128. In the example shown in FIG. 9, five command buttons 132 are arranged in a row at a predetermined interval on the lower side of the liquid crystal panel 131. These command buttons 132 are used to operate the display content of the liquid crystal panel 131.

The buzzer 129 is a sound generating unit that generates an electronic sound. The buzzer 129 is equipped with an output unit such as a speaker as the part that generates 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.

Figure 10 shows an example of a 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 display various statuses of the combine harvester 1.

As shown in FIG. 10, a speedometer 141, which is a display unit that displays the traveling speed of the combine harvester 1, is located in the center of the main screen 140. A tachometer 142, which is a display unit that displays the RPM of the engine 25, is located as a substantially circular display unit surrounding the speedometer 141.

To the left of the tachometer 142 are a fuel gauge 143, which is a display that displays the remaining amount of fuel, and a urea water meter 144, which is a display that displays the remaining amount of urea. The remaining amount of urea displayed by the urea water meter 144 is the remaining amount of urea water in a urea water tank that stores urea water to be supplied to a selective catalytic reduction (SCR) system that an exhaust gas purification device (not shown) equipped with in the combine harvester 1 has together with a DPF (diesel particulate filter) case. To the right of the tachometer 142 is a grain tank monitor 145, which is a display that displays the amount of grain stored in the grain tank 10. Below the grain tank monitor 145, various displays are arranged that display the crop yield (kg), work time (h), and the current date and time.

Located below and to the left of the tachometer 142 and at the bottom left of the main screen 140 is a crop name display section 147, which is a display section that displays the currently set crop type (crop name). The crop type selected by the operator is displayed in the crop name display section 147. In the example shown in FIG. 10, the word "soybean" is displayed in the crop name display section 147. The setting of the crop type will be described later.

At the bottom edge of the display screen of the liquid crystal panel 131, a first operation display section 151, a second operation display section 152, a third operation display section 153, a fourth operation display section 154, and a fifth operation display section 155 are arranged, from the left, 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.

Each of the operation display units 151-155 appropriately displays characters and symbols for display operations according to the type of display screen of the liquid crystal panel 131. In the example shown in FIG. 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, the screen display of the liquid crystal panel 131 transitions to the menu screen 160 (see FIG. 11). In the following, pressing the command button 132 corresponding to each of the operation display units 151-155 or pressing each of the operation display units 151-155 itself will be collectively referred to as the operation of that operation display unit.

The setting of the type of crop by the monitor 128 will be described with reference to Figs. 11 to 14. The type of crop is set by the operator operating the monitor 128. In other words, with regard to the setting of the type of crop, the monitor 128 functions as a setting device that receives an input operation for setting the type of crop to be harvested and sends information regarding the set type of crop to the control unit 120.

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 section 157 is disposed on the upper edge of the display screen of the liquid crystal panel 131 as a display section that displays the display contents of that screen. On the menu screen 160, the word "menu" is displayed in the screen content display section 157.

As shown in FIG. 11, the menu screen 160 has multiple setting item display sections (161, 162, 163) that display various setting items related to the control of the combine harvester 1, etc. In the example shown in FIG. 11, the setting item display sections are arranged, from top to bottom, as a first setting item display section 161 displaying the words "Combine Settings", a second setting item display section 162 displaying the words "Basic Settings", and a third setting item display section 163 displaying the words "Work Information Settings". Each of these setting item display sections is provided as a strip-shaped display section that spans almost the entire range in the left-right direction of the screen of the liquid crystal panel 131.

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

In the menu screen 160, one of the multiple setting item display sections (161, 162, 163) is selected. In the example shown in FIG. 11, the third setting item display section 163 is shown selected. The liquid crystal panel 131 displays the selected state of the setting item display section in a non-selected state so that it can be distinguished and recognized by making it a bright display section, a colored section, or by surrounding it with a frame. In the example shown in FIG. 11, the non-selected setting item display section is colorless, while the selected state of the setting item display section is displayed as a colored section.

On the menu screen 160, the setting item display section is selected by operating the third operation display section 153, which displays the "↑" symbol, and the fourth operation display section 154, which displays the "↓" symbol. Operating the third operation display section 153 moves the display of the selection status up, and operating the fourth operation display section 154 moves the display of the selection status down.

When setting the type of crop, the third setting item display section 163 of "Crop information setting" is selected on the menu screen 160. The selection of the setting item display section is confirmed by operating the fifth operation display section 155 which displays the word "Confirm." By operating the fifth operation display section 155 on the menu screen 160, the screen display on the liquid crystal panel 131 transitions to the work information setting screen 170 (see FIG. 12).

Figure 12 shows an example of a 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 in the screen content display section 157.

As shown in FIG. 12, the work information setting screen 170 has multiple work information setting item display sections (171, 172, 173) that are display sections that display setting items for various work information related to the control of the combine harvester 1, etc. In the example shown in FIG. 12, the work information setting item display sections are arranged, from top to bottom, as a first work information setting item display section 171 that displays the characters "Crop switching", a second work information setting item display section 172 that displays the characters "Sensor setting", and a third work information setting item display section 173 that displays the characters "Yield sensor zero point calibration". These work information setting item display sections are displayed in the same manner as the multiple setting item display sections in the menu screen 160.

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

On the work information setting screen 170, one of the multiple work information setting item display sections (171, 172, 173) is selected. The selected state of the work information setting item display section is displayed in the same manner as on the menu screen 160. Also, the selection of the work information setting item display section is performed by operating the third operation display section 153 and the fourth operation display section 154, as in the case of the menu screen 160.

When setting the type of crop, the first work information setting item display section 171 of "Crop switching" is selected on the work information setting screen 170. Selection of the work information setting item display section is determined by operating the fifth operation display section 155, as with the menu screen 160. By operating the fifth operation display section 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 FIG. 13).

Figure 13 shows an example of a 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 in the screen content display section 157.

As shown in FIG. 13, the crop switching screen 180 has multiple set crop display sections (181-185) that display the setting items for various crops to be harvested by the combine harvester 1. In the example shown in FIG. 13, the set crop display sections are arranged, from top to bottom, as a first set crop display section 181 displaying the character "Rice", a second set crop display section 182 displaying the character "Wheat", a third set crop display section 183 displaying the character "Corn", a fourth set crop display section 184 displaying the character "Soybean", and a fifth set crop display section 185 displaying the character "Other". These set crop display sections are displayed in the same manner as the multiple setting item display sections in the menu screen 160.

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

In the crop switching screen 180, one of the multiple set crop display sections (181 to 185) is selected. The selected state of the set crop display section is displayed in the same manner as in the menu screen 160. Also, the selection of the set crop display section is performed by operating the third operation display section 153 and the fourth operation display section 154, as in the case of the menu screen 160.

The type of crop to be harvested is selected on the crop switching screen 180. The selection of the set crop display section is determined by operating the fifth operation display section 155, as with the menu screen 160. By operating the fifth operation display section 155 on the crop switching screen 180, the screen display on the liquid crystal panel 131 transitions to a setting completion screen 190 (see FIG. 14) indicating that the setting of the type of crop has been completed. Here, a case where "soybean" is selected on the fourth set crop display section 184 is described.

The types and number of crops that can be selected on the crop switching screen 180 are not limited. In the example shown in FIG. 13, four types of crops are displayed: "rice," "wheat," "corn," and "soybean." However, for example, three types of crops may be displayed: "rice," "wheat," and "soybean." In addition, when the fifth set crop display section 185 for "other" is selected on the crop switching screen 180, a second crop switching screen that allows selection of multiple types of crops included in "other" may be displayed.

Figure 14 shows an example of a setting end screen 190, which is one of the display screens on the liquid crystal panel 131 of the monitor 128. On the setting end screen 190, the words "Successfully completed" are displayed in the screen content display section 157.

As shown in FIG. 14, the setting end screen 190 has a message display section 191 that displays a message regarding the setting of the crop type. In the example shown in FIG. 14, the message display section 191 displays the text "Crop switched to soybean." as a display to notify that the crop type has been switched to "soybean", that is, that "soybean" has been set as the crop type.

In the setting end screen 190, the first operation display unit 151 displays the word "Back." By operating the first operation display unit 151, the screen display of the liquid crystal panel 131 transitions to the crop switching screen 180 (see FIG. 13), making it possible to select the type of crop again. Also, in the setting end screen 190, the second operation display unit 152 displays the word "Go to meter." By operating the second operation display unit 152, the screen display of the liquid crystal panel 131 transitions to the main screen 140 (see FIG. 10).

In this manner, 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 in the crop name display section 147 of the main screen 140 (see FIG. 10). In the example shown in FIG. 10, the selection state of "soybean" is shown. For example, when "wheat" is set by setting the type of crop by the monitor 128, that is, when the second set crop display section 182 is selected on the crop switching screen 180, the word "wheat" is displayed in the crop name display section 147.

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 controlling the threshing drum rotation, the control unit 120 uses the correspondence between the rotation speed of the engine 25 (hereinafter referred to as "engine rotation speed") and the rotation speed of the threshing drum 41 (hereinafter referred to as "rotor rotation speed") that is set in advance for each type of crop.

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

Based on the rotation speed correspondence relationship, the control unit 120 judges whether the rotor rotation speed, which is the rotation speed of the threshing drum 41 detected by the threshing drum rotation sensor 125 (see FIG. 8), is consistent with the rotation speed correspondence relationship corresponding to the type of crop set by the monitor 128 (hereinafter referred to as the "monitor-set crop") (hereinafter referred to as the "rotation speed consistency judgment"), and controls the display of the judgment result of the rotation speed consistency judgment on the monitor 128. In other words, in this embodiment, the control unit 120 functions as a judgment means that performs the rotation speed consistency judgment and displays the judgment result on the monitor 128.

The rotation speed correspondence relationship used in the control of the rotation speed matching judgment is the portion of the first rotation speed range D1, which is the range from the first rotation speed E1 to the second rotation speed E2, where the engine rotation speed is relatively stable, among the three graphs (G1, G2, G3). In the first rotation speed range D1, all three graphs (G1, G2, G3) show a proportional relationship, and the rotor rotation speed value and slope value decrease 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.

Specific numerical examples of the rotation speed correspondence relationship shown in FIG. 12 are as follows. The first rotation speed E1 is 1300 (rpm), and the second rotation speed E2 is 2500 (rpm). The rotor rotation speed value corresponding to the first rotation speed E1 is 369 (rpm) in the first graph G1 for rice and wheat, 273 (rpm) in the second graph G2 for corn, and 162 (rpm) in the third graph G3 for soybeans. The rotor rotation speed value corresponding to the second rotation speed E2 is 710 (rpm) in the first graph G1 for rice and wheat, 525 (rpm) in the second graph G2 for corn, and 311 (rpm) in the third graph G3 for soybeans.

The rotation speed correspondence relationship as shown in FIG. 12 is preset and stored in the memory unit 121 of the control unit 120. Note that the lower and upper limit values of the first rotation speed range D1 and the rotor rotation speed values for each type of crop that correspond to the lower and upper limit values are not limited.

Regarding the rotation speed consistency judgment, a case where the monitor crop is "soybean" will be described. In this case, as shown in FIG. 15, when the engine speed is 2000 (rpm), the rotor speed is 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 result of the rotation speed consistency judgment is "inconsistent". 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 result of the rotation speed consistency judgment is "consistent". Note that the rotation speed F1 is about 250 (rpm) and the rotation speed F2 is about 575 (rpm).

The reason why the result of the rotation speed matching judgment is "inconsistent" is because the monitor-set crop is different from the type of crop that corresponds to the speed change state of the threshing drum 41 caused by the operation of the threshing speed change lever 110 (see Figure 6). The above example is an example in which the monitor-set crop is "soybeans" and the speed change state of the threshing drum 41 caused by the threshing speed change device 58 is set to a high speed state used for rice and wheat.

Regarding the display of the result of the rotation speed consistency judgment on the monitor 128, if the rotor rotation speed detected by the throttling drum rotation sensor 125 does not match the rotation speed correspondence relationship corresponding to the crop set on the monitor, that is, if the result of the rotation speed consistency judgment is "inconsistent," the control unit 120 displays an alarm on the monitor 128.

Specifically, when the result of the rotation speed matching determination is "mismatched," the control unit 120 displays an alarm screen 200, for example, as shown in FIG. 16, on the liquid crystal panel 131 of the monitor 128. FIG. 16 shows an example of the 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 in the screen content display section 157.

As shown in FIG. 16, the warning screen 200 has a warning message display section 201 that displays a warning message as a result of the rotation speed consistency judgment. In the example shown in FIG. 16, the warning message display section 201 displays the text "The currently set crop does not match the speed change state of the threshing drum" to notify that the result of the rotation speed consistency judgment is "inconsistent". Note that the display content of the warning message display section 201 is not particularly limited. By operating the first operation display section 151 that displays the text "Back" on the setting end screen 190, the screen display of the liquid crystal panel 131 transitions to the main screen 140 (see FIG. 10).

In addition, when the result of the rotation speed matching judgment is "mismatched," the control unit 120 sends a control signal to the buzzer 129 to cause the buzzer 129 to emit an alarm sound. In other words, when the result of the rotation speed matching judgment is "mismatched," the control unit 120 displays the warning screen 200 on the liquid crystal panel 131 and causes the buzzer 129 to emit an alarm sound. This alerts the operator. The operator who recognizes the "mismatched" judgment result 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 crop set for monitoring.

On the other hand, when the result of the rotation speed alignment determination is "aligned," the control unit 120 may be configured to display this on the liquid crystal panel 131. When the result of the determination is "aligned," the liquid crystal panel 131 may display, for example, the word "aligned" in a predetermined location on the main screen 140, as shown in FIG. 10. In the example shown in FIG. 10, an alignment result display unit 148 that displays the word "aligned" is located near the top of the crop name display unit 147.

When the result of the determination is "consistent," the control unit 120 displays the type of crop (crop name) that has been set on the liquid crystal panel 131 on the monitor 128, as shown in FIG. 10. In the example shown in FIG. 10, the word "soybean," which is the type of crop set for the monitor, is displayed in the crop name display unit 147. In other words, when the result of the rotation speed consistency determination is "consistent," the display of the crop name in the crop name display unit 147 that displays the crop set for the monitor is maintained.

In addition, when the result of the rotation speed matching determination is "matched", the crop name may be displayed in a blinking manner on the monitor 128. That is, as the display control of the liquid crystal panel 131 when the result of the determination is "matched", the display of the crop name in the crop name display unit 147 may be made to blink as shown in Figs. 17A and 17B. Fig. 17A shows the crop name display unit 147A in a state where the characters "soybean" have been erased, and Fig. 17B shows the crop name display unit 147B in a state where the characters "soybean" are lit. The manner in which the crop name is blinked in the crop name display unit 147 is not particularly limited. For example, the characters "soybean" may be blinked by blinking the background portion of the crop name display unit 147.

When the result of the rotation speed consistency judgment is "consistent," this corresponds to a normal state of rotation of the handling drum 41. Therefore, the display content of the liquid crystal panel 131 may be controlled so that the result of the rotation speed consistency judgment is not displayed on the liquid crystal panel 131. In other words, only when the result of the rotation speed consistency judgment is "inconsistent," control may be performed so that a message to that effect is displayed on the liquid crystal panel 131.

In addition, with regard to the control of the rotation speed matching judgment, the control unit 120 performs the rotation speed matching judgment a predetermined time after the threshing clutch 57 is in the on state in which power is transmitted to the threshing body shaft 41a.

The control unit 120 detects that the threshing clutch 57 is engaged based on the detection signal from the threshing clutch sensor 126. The control unit 120 receives the detection signal from the threshing clutch sensor 126 and uses the timer 122 to measure the time that has elapsed since it detected that the threshing clutch 57 is engaged. When the elapsed time measured by the timer 122 reaches a predetermined time (for example, several seconds to several tens of seconds), control is performed to determine whether the rotation speed is consistent. This predetermined time is set and stored in advance in the memory unit 121 of the control unit 120.

An example of the control mode by the control unit 120 will be described with reference to the flowchart shown in FIG. 18. FIG. 18 is a flowchart showing an example of the control mode of the rotation speed matching determination by the control unit 120. The control described below is performed by the CPU of the control unit 120 reading and executing a predetermined control program stored in the RAM or the like of the storage unit 121.

When controlling the rotation speed matching judgment, the speed change state of the threshing drum 41 is set in advance by operating the threshing speed change lever 110, and the type of crop is set by the monitor 128.

As shown in FIG. 18, first, the on/off state of the threshing clutch 57 detected by the threshing clutch sensor 126 is judged as to whether a predetermined time Δt has elapsed since the threshing clutch 57 was turned on (S10). This step S10 is to ensure that the rotation of the threshing drum 41 is stabilized.

In step S10, if it is determined that a predetermined time Δt has elapsed since the threshing clutch 57 was turned on (S10, Yes), the rotation of the threshing drum 41 is deemed to have stabilized, and a determination is made as to whether the engine speed detected by the engine speed sensor 124 is within the first rotation speed range D1 (see FIG. 15) (S20). Since the range of engine speeds for the rotation speed correspondence relationship used in the control of the rotation speed consistency determination is the first rotation speed range D1, the condition for controlling the rotation speed consistency determination is that the engine speed is within the first rotation speed range D1. On the other hand, in step S10, unless the predetermined time Δt has elapsed since the threshing clutch 57 was turned on (S10, No), the rotation of the threshing drum 41 is deemed to have stabilized, and the determination in step S20 is not made.

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

If it is determined in step S30 that the rotor rotation speed is consistent with the rotation speed correspondence relationship corresponding to the monitor-set crop (S30, Yes), the result of the determination is displayed on the monitor (S40). In this case, the result of the rotation speed consistency determination is "consistent", and the word "consistent" is displayed on the monitor in the consistency result display section 148 of the main screen 140 displayed on the liquid crystal panel 131, as shown in FIG. 10, for example. In this case, the display of the name of the monitor-set 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 flashing manner (see FIG. 17A, FIG. 17B).

On the other hand, if it is not determined in step S30 that the rotor rotation speed is consistent with the rotation speed correspondence relationship corresponding to the crop set on the monitor (S30, No), an alarm is displayed and an alarm sound is generated (S50). In this case, the result of the rotation speed consistency determination is "inconsistent," and an alarm screen 200 such as that shown in FIG. 16 is displayed on the liquid crystal panel 131 of the monitor 128, and an alarm sound is generated by the buzzer 129.

If the result of the rotation speed consistency judgment in step S30 is "inconsistent," the rotor rotation speed will be a value on one of the two graphs other than the graph corresponding to the monitor crop, depending on the setting of the speed change state of the threshing drum 41 by operating the threshing speed change lever 110. In other words, in the example where the monitor crop is "rice/wheat" as described above, the rotor rotation speed detected by the threshing drum 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 drum 41.

The control unit 120 also performs rotor rotation jam control in addition to the control of the rotation speed consistency determination described above as a handling drum rotation control using the rotation speed correspondence relationship.

The control unit 120 performs rotor rotation jam control by displaying an alarm on the monitor 128 when 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), based on the rotation speed correspondence relationship, falls below a threshold value previously set for each type of crop.

As shown in FIG. 19, the rotation speed correspondence relationship used in rotor rotation clogging control is the portion of the range of the second rotation speed range D2, which is a range of the engine rotation speed value smaller than the first rotation speed range D1, among the three graphs (G1, G2, G3). The second rotation speed range D2 is the range from the third rotation speed E3 to the first rotation speed E1. In the second rotation speed range D2, all three graphs (G1, G2, G3) show a proportional relationship, and the rotor rotation speed value and the slope value decrease 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.

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

As the rotor rotation speed threshold value used for rotor rotation jam 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. That is, as shown in FIG. 19, a first threshold value H1 (see point P01) on the first graph G1 which is the threshold value for rice and wheat, a second threshold value H2 (see point P02) on the second graph G2 which is the threshold value for corn, and a third threshold value H3 (see point P03) on the third graph G3 which is the threshold value for soybeans are set.

The magnitude of the thresholds decreases in the order of the first threshold H1, the second threshold H2, and the third threshold H3. The first threshold H1 for rice and wheat is, for example, 249 (rpm), the second threshold H2 for corn is, for example, 200 (rpm), and the third threshold H3 for soybeans is, for example, 150 (rpm).

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

As with the thresholds described above, the magnitude of the alarm release value decreases in the order of rice/wheat, corn, and soybeans. The alarm release value for rice/wheat is, for example, 269 (rpm), the alarm release value for corn is, for example, 225 (rpm), and the alarm release value for soybeans is, for example, 180 (rpm).

The rotor rotation speed threshold and alarm release value for each type of crop regarding rotor rotation clogging control are set and stored in advance in the memory unit 121 of the control unit 120. Note that the values of the rotor rotation speed threshold and alarm release value are not limited to the above-mentioned examples.

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

Regarding rotor jamming control, we will explain the case where the monitor-set crop is "rice/wheat." In this case, during threshing, when the rotor rotation speed once increases to the threshing rotation speed, it drops to a rotation speed below the first threshold value H1 (e.g., 249 (rpm)), and the control unit 120 displays an alarm on the monitor 128.

When the rotor rotation speed falls below the first threshold value H1 during threshing, this is due to a malfunction such as a blockage of straw in the handling chamber 40. Therefore, the control unit 120 issues a blockage alarm when the rotor rotation speed falls below the first threshold value H1.

Specifically, the control unit 120 displays a rotor clogging alarm screen 210, for example, as shown in FIG. 20, on the liquid crystal panel 131 of the monitor 128 as a clogging alarm. FIG. 20 shows an example of the rotor clogging alarm screen 210, which is one of the display screens on the liquid crystal panel 131. On the rotor clogging alarm screen 210, the words "Rotor clogging alarm" are displayed in the screen content display section 157.

As shown in FIG. 20, the rotor clogging alarm screen 210 has an alarm message display section 211 that displays a rotor clogging alarm message. In the example shown in FIG. 20, the alarm message display section 211 displays the text "The rotor rotation speed is decreasing. Please reduce the speed" to notify that the rotation speed of the handling drum 41 is lower than normal. Note that the display content of the alarm message display section 211 is not particularly limited. By operating the first operation display section 151 that displays the text "Back" on the rotor clogging alarm screen 210, the screen display of the liquid crystal panel 131 transitions to the main screen 140 (see FIG. 10).

The control unit 120 also sends a control signal to the buzzer 129 to make the buzzer 129 generate an alarm sound as a clogging alarm. In other words, when the rotor rotation speed falls below a threshold, the control unit 120 displays the rotor clogging alarm screen 210 on the liquid crystal panel 131 and makes the buzzer 129 generate an alarm sound. This alerts the operator.

The occurrence of an alarm in rotor jam control is cancelled when the rotor rotation speed detected by the threshing drum rotation sensor 125 exceeds the alarm release value. Specifically, following the example described above, when the monitor-set crop is "rice/wheat" and the rotor rotation speed exceeds the alarm release value set for rice/wheat (e.g., 269 (rpm)), the display of the rotor jam alarm screen 210 on the liquid crystal panel 131 and the alarm sound from the buzzer 129 are stopped.

In addition, with regard to rotor jamming control, the control unit 120 may perform the rotation speed matching determination after a predetermined time has elapsed since the threshing clutch 57 was turned on, as in the case of the control of the rotation speed matching determination. In this case, the control unit 120 performs rotor jamming control on the condition that a predetermined time (e.g., several seconds to several tens of seconds) has elapsed since the control unit 120 detected that the threshing clutch 57 was turned on.

The control unit 120 also performs winnower air volume control, which changes the air volume of the winnower 47 according to the monitor crop, as a control using the monitor crop. The winnower air volume control is a control that changes the magnitude of the air volume at each stage of the winnower 47 air volume adjustment, which is adjusted in multiple stages by an operating device for adjusting the air volume of the winnower 47, according to the type of monitor crop.

For adjusting the air volume of the winnower 47, an air volume adjustment dial 300 including a rotatable dial portion is provided on the lever column 24 of the driving unit 15 as an operating tool for adjusting the air volume of the winnower 47 (see FIG. 8). The air volume adjustment dial 300 is connected to the control unit 120 via a sensor portion, and the rotation angle of the dial portion of the air volume adjustment dial 300 is detected by the sensor portion. The sensor portion inputs a detection signal regarding the rotation angle of the dial portion to the control unit 120. The air volume adjustment dial 300 makes it possible to adjust the air volume of the winnower 47 in multiple steps, for example five steps, by rotating the dial portion.

The winnower 47 has a winnowing shaft 47a, which is a rotating shaft with the left-right direction as the rotation axis direction, and multiple blades, and is located below the front of the handling drum 41 (see Figure 1). The winnower 47 is provided with an air volume adjustment device (not shown) for adjusting the air volume of the winnower 47. The air volume adjustment device may be of a known configuration, for example, including 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 for operating the cam mechanism, and a transmission mechanism disposed between the cam mechanism and the winnowing actuator 301. The winnowing actuator 301 is composed of an electric motor and is connected to the control unit 120, and its operation is controlled by the control unit 120 (see Figure 8).

According to the air volume adjustment device, the belt groove width of the splitter pulley is widened by the operation of the cam mechanism accompanying the drive of the winnowing actuator 301, thereby reducing the rotation radius of the belt wound around the splitter pulley. This increases the rotation speed of the winnowing shaft 47a, i.e. the rotation speed of the winnowing 47, and increases the air volume of the winnowing 47. On the other hand, the belt groove width of the splitter pulley is narrowed by the operation of the cam mechanism accompanying the drive of the winnowing actuator 301, thereby reducing the rotation radius of the belt wound around the splitter pulley. This reduces the rotation speed of the winnowing shaft 47a, i.e. the rotation speed of the winnowing 47, and decreases/increases the air volume of the winnowing 47.

The control unit 120 adjusts the air volume of the winnower 47 by driving the winnower actuator 301 in this manner based on the operation of the air volume adjustment dial 300. Therefore, the control unit 120 controls the winnower air volume using the monitor crop by changing the air volume of the winnower 47 at each stage of the air volume adjustment dial 300 according to the type of monitor crop.

According to the winnower air volume control, the air volume of the winnower 47 at each stage of the air volume adjustment dial 300 is adjusted so that the larger the monitor crop, the greater the air volume of the winnower 47. In other words, the air volume is adjusted to be greater at each stage adjusted by the air volume adjustment dial 300 in the order of monitor crops "rice/wheat," "corn," and "soybeans."

Specifically, for example, in a configuration in which the air volume adjustment dial 300 adjusts the air volume in five stages from "1" (weak) to "5" (strong), the air volume at each of the five stages is changed depending on the monitor crop, increasing in the order of "rice/wheat," "corn," and "soybeans."

Therefore, when the monitor crop is switched, the control unit 120 sets the control amount of the winnower actuator 301 at each stage based on the detection signal from the sensor unit accompanying the operation of the air volume adjustment dial 300 to an amount that corresponds to the currently monitor crop. For example, the control unit 120 sets the air volume of the winnower 47 to a standard air volume when the monitor crop is "rice/wheat", a first strong air volume that is stronger than the standard air volume when the monitor crop is "corn", and a second strong air volume that is stronger than the first strong air volume when the monitor crop is "soybean".

As an example of a change in the winnower 47 air volume, the air volumes "1", "2", and "3" adjusted by the air volume adjustment dial 300 at the first strong air volume corresponding to "corn" are controlled to be equivalent to the air volumes "2", "3", and "4" adjusted by the air volume adjustment dial 300 at the standard air volume corresponding to "rice/wheat". Also, the air volumes "1", "2", and "3" adjusted by the air volume adjustment dial 300 at the second strong air volume corresponding to "soybeans" are controlled to be equivalent to the air volumes "3", "4", and "5" adjusted by the air volume adjustment dial 300 at the standard air volume corresponding to "rice/wheat".

The combine harvester 1 according to this embodiment, which has the above-mentioned configuration, can easily and in advance determine whether the speed setting of the threshing drum 41 is incorrect, and can control the rotation state of the threshing drum 41 to a state suitable for the crop to be harvested, and can quickly detect any malfunctions in the threshing drum 41.

The control unit 120 is configured to use the monitor-set crop and the rotation speed correspondence relationship to perform a rotation speed matching judgment and display the judgment result on the monitor 128. With this configuration, if the speed change state of the threshing drum 41 set by operating the threshing speed change device 58 with the threshing speed change lever 110 differs from the monitor-set crop, the monitor 128 displays a notification. Therefore, the operator can easily and in advance recognize an error in the speed change setting of the threshing drum 41 by setting the type of crop in advance on the monitor 128 when performing harvesting work.

As a result, even if the operator does not understand the speed setting of the threshing speed change device 58, it is possible to prevent the threshing drum 41 from continuing to rotate at a speed that is not suitable for the crop to be harvested, and to prevent the stalks from clogging the threshing chamber 40 and damage to the crop. In addition, because an error in the speed setting of the threshing drum 41 can be recognized in advance, a change in the rotation speed of the threshing drum 41 caused by a problem such as a clogging of stalks in the threshing chamber 40 or a slippage of the threshing drum can be quickly detected as an abnormality in the rotation state of the threshing drum 41. This makes it possible to immediately recognize a problem with the threshing drum 41.

In addition, during harvesting operations by the combine 1, it is assumed that the speed change state of the threshing drum 41 caused by the threshing speed change device 58 may be suddenly changed due to some cause, such as an external force acting on the threshing speed change lever 110. In such a case, the control for determining rotation speed consistency will detect a 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.

The control unit 120 is also configured to, in controlling the rotation speed consistency judgment, display the name of the monitor-set crop on the monitor 128 if the judgment result is "consistent," and to issue an alarm by displaying on the monitor 128, etc., if the judgment result is "inconsistent." With this configuration, the operator can be reliably informed of the judgment result of the rotation speed consistency judgment.

In addition, when the result of the control for determining whether the rotation speed is consistent is "consistent," the display control may be such that the name of the crop set on the monitor on the liquid crystal panel 131 flashes. With this configuration, the visibility of the display of the name of the crop set on the monitor on the liquid crystal panel 131 can be improved, and the operator working can be reliably informed that the result of the determination is "consistent."

The control unit 120 may also be configured to issue an alarm, such as by displaying it on the monitor 128, only when the result of the determination in the control of the rotation speed consistency determination is "inconsistent." With this configuration, an error in the speed setting of the threshing drum 41 can be notified, and when the result of the determination is "consistent," that is, when the speed setting of the threshing drum 41 is correct in relation to the crop to be harvested, the effect on the operator caused by the control of the rotation speed consistency determination can be eliminated. This allows the operator to be reliably notified of an error in the speed setting of the threshing drum 41, and the accuracy of the notification to the operator caused by the control of the rotation speed consistency determination can be improved.

The control unit 120 is also configured to perform a speed matching determination a predetermined time after the threshing clutch 57 is turned on. With this configuration, the speed matching determination can be performed when the rotation speed of the threshing drum 41 is stable, improving the accuracy of the speed matching determination and making it possible to reliably recognize errors in the speed setting of the threshing drum 41.

In addition, with a configuration that controls the rotation speed matching judgment, it is possible to recognize the gear stage of the threshing transmission 58 by setting the type of crop on the monitor 128 so that a "matching" judgment result is obtained. This makes it possible for the operator to indirectly grasp the gear stage of the threshing transmission 58, i.e., the gear shift state of the threshing transmission 58, without having to install a separate sensor to detect the gear stage of the threshing transmission 58, and without having to check the lever position of the threshing transmission lever 110, while remaining inside the cabin 16.

The control unit 120 is also configured to perform rotor jamming control using the monitor-set crop and rotation speed correspondence relationship. With this configuration, if the rotor rotation speed drops by a certain amount or more depending on the speed change state of the threshing drum 41, an alarm is issued by the monitor 128, etc. This makes it possible to accurately detect rotor jamming depending on the type of crop to be harvested. Furthermore, with the control unit 120 configured to perform rotor jamming control after a predetermined time has elapsed since the threshing clutch 57 was turned on, it becomes possible to more accurately detect rotor jamming due to rotor jamming control.

The control unit 120 is also configured to perform winnower air volume control, which changes the air volume of the winnower 47 using the monitor crop. With this configuration, the air volume of the winnower 47 can be adjusted by the air volume adjustment dial 300 to be suitable for the crop to be harvested, thereby improving the accuracy of grain sorting in the sorting unit 8.

The combine harvester according to the present invention described above using the embodiments is not limited to the above-mentioned embodiments, and various aspects can be adopted within the scope of the spirit of the present invention.

In the above-described embodiment, the monitor 128 is configured to function as both the display device and the setting device according to the present invention, but the display device and the setting device may be configured as independent devices.

In the above-described embodiment, the threshing transmission 58 is configured to be able to set three speed stages, but the number of speed stages of the threshing transmission 58 is not limited. The threshing transmission 58 may be configured to have two speed stages or four or more speed stages. Depending on the number of speed stages of the threshing transmission 58, the number of crop types and the number of rotation speed correspondence relationships that can be selected by the monitor 128 in the control by the control unit 120 for the control of the rotation speed matching judgment, the rotor rotation jam control, etc. are set. This technology is preferably used in a configuration with a threshing transmission 58 having three or more speed stages.

1 Combine 3 Harvesting section 7 Threshing section 8 Sorting section 15 Driving section 25 Engine (driving source)
40 threshing chamber 41 threshing drum 41a threshing drum shaft 47 winnower 57 threshing clutch 58 threshing speed change device (speed change device)
59 Throwing drum input shaft 120 Control unit 124 Engine rotation sensor 125 Throwing drum rotation sensor (rotation detection device)
126 Threshing clutch sensor 128 Monitor (display device, setting device)
129 Buzzer

Claims (4)

A combine harvester that transports stalks harvested by a harvesting section and supplies them to a threshing section,
A threshing cylinder provided in a threshing chamber of the threshing unit and rotatably supported by a threshing cylinder shaft;
A speed change device having a throttling cylinder input shaft for rotating by receiving power from a drive source and transmitting rotational power to the throttling cylinder shaft, the speed change device being configured to be able to change the rotation speed of the throttling cylinder to a plurality of speed change stages;
A rotation detection device for detecting the rotation speed of the threshing drum;
A control unit that receives an input of a detection signal from the rotation detection device;
A display device whose display content is controlled by the control unit;
A setting device that sends information about the set crop type to the control unit,
The control unit determines 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 based on the correspondence between the rotation speed of the drive source and the rotation speed of the threshing drum, which is set in advance for each type of crop, and displays the result of the determination on the display device. The control unit is
When the rotation speed of the threshing drum detected by the rotation detection device matches the correspondence relationship corresponding to the type of crop set by the setting device, the type of crop that has been set is displayed on the display device;
The combine harvester according to claim 1, characterized in that, when the rotation speed of the threshing drum detected by the rotation detection device does not match the correspondence relationship corresponding to the type of crop set by the setting device, an alarm is displayed on the display device. The combine harvester described in claim 2, characterized in that the control unit causes the display device to flash the type of crop when the rotation speed of the threshing drum detected by the rotation detection device matches the correspondence relationship corresponding to the type of crop set by the setting device. A threshing clutch is provided for interrupting the transmission of power from the drive source to the threshing cylinder shaft,
The combine harvester according to any one of claims 1 to 3, characterized in that the control unit makes the judgment after a predetermined time has elapsed since the threshing clutch enters an on state in which power is transmitted to the threshing drum shaft.

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