Combine harvester

Abstract

To provide a combine harvester capable of obtaining stable sorting accuracy and improving sorting efficiency in a sorting part.SOLUTION: This combine harvester is equipped with a threshing part for threshing a crop, a shaking sorting device 44 for sorting the threshed material threshed by the threshing part, and a winnower for sending sorting wind to the shaking sorting device 44, and the shaking sorting device 44 has a chaff sieve 120 for sorting the threshed material, a grain sieve 130 provided below the chaff sieve 120 for sorting the threshed material sorted by the chaff sieve 120, and a wind direction part 200 provided on the grain sieve 130 for guiding the sorting wind from the winnower upward.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a combine harvester equipped with a swinging sorting device that sorts grains threshed by a threshing section. [Background technology]

[0002] Some combine harvesters are equipped with a configuration in which crops harvested by a harvesting section are transported by a conveying device and supplied to a threshing section, and the grains threshed by the threshing section are sorted by a sorting section located below the threshing section. The sorting section has a shaking sorting device that sorts grains by shaking. The shaking sorting device includes, as sorting components, a chaff sieve with multiple fins and a grain sieve located below the chaff sieve. The sorting section also has a winnower, fan, or other device that generates a sorting wind to achieve wind sorting.

[0003] Regarding the configuration of the sorting section, Patent Document 1 discloses a configuration in which a transfer plate with multiple protrusions is provided between left and right side plates, a first leakage sorting section made of a crimped mesh, and a mesh cover plate that is arranged to move back and forth from the underside of the transfer plate above the first leakage sorting section, and a wind direction plate that acts on the sorting wind is provided below the first leakage sorting section. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 2575074 Summary of the Invention [Problem to be solved by the invention]

[0005] In the configuration disclosed in Patent Document 1, the air direction plate is provided with both left and right ends fixed to the left and right side plates, respectively. In other words, the air direction plate is provided as a fixed component relative to the sealing plate, which moves back and forth. With such a configuration, it is difficult to obtain a sufficient guiding effect of the air direction plate for the sorting air acting on the configuration that performs oscillating sorting, resulting in problems such as unstable sorting accuracy and a lack of improvement in sorting efficiency.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a combine harvester that can achieve stable sorting accuracy in the sorting section and improve sorting efficiency. [Means for solving the problem]

[0007] The combine harvester of the present invention is a combine harvester equipped with a threshing section that threshes crops, an oscillating sorting device that sorts the threshed material threshed by the threshing section, and a winnower that blows sorting air to the oscillating sorting device, and the oscillating sorting device has a chaff sieve that sorts the threshed material, a grain sieve that is provided below the chaff sieve and sorts the threshed material sorted by the chaff sieve, and a wind direction section that is provided on the grain sieve and guides the sorting air from the winnower upward.

[0008] In another aspect of the combine harvester according to the present invention, in the combine harvester, the wind direction portion is provided on the underside of the grain sieve.

[0009] Another aspect of the combine harvester of the present invention is that in the combine harvester, the grain sieve includes a plate-shaped grain sieve main body having a number of holes formed therethrough for sorting the threshed material, and the grain sieve main body has some of the holes, among the many holes, that are located upstream of the flow of the sorting wind relative to the wind direction section, as enlarged holes with a larger opening area than the other holes.

[0010] In another aspect of the combine harvester according to the present invention, the enlarged hole portion has a larger opening area than the other hole portions by making the left-right dimension of the enlarged hole portion longer than the other hole portions.

[0011] Another aspect of the combine harvester of the present invention is that, in the combine harvester, the wind direction section is constituted by a wind direction member attached to the grain sieve, and the wind direction member is detachably attached to the grain sieve.

[0012] In another aspect of the combine harvester according to the present invention, the wind direction section is provided at a plurality of locations in the front-to-rear direction. [Effects of the Invention]

[0013] According to the present invention, stable sorting accuracy can be obtained in the sorting section, and sorting efficiency can be improved. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a left side view of a combine harvester according to an embodiment of the present invention. FIG. [Figure 2] FIG. 1 is a right side view of a combine harvester according to an embodiment of the present invention. [Figure 3] 1 is a plan view of a combine harvester according to an embodiment of the present invention. [Figure 4] FIG. 1 is a diagram showing a power transmission configuration in a combine harvester according to one embodiment of the present invention. [Figure 5] A left side cross-sectional view showing the configuration of the threshing section and sorting section in one embodiment of the present invention. [Figure 6] 1 is a left side cross-sectional view showing the configuration of an oscillating sorting device according to an embodiment of the present invention. [Figure 7] FIG. 1 is a perspective view showing a support bracket according to an embodiment of the present invention. [Figure 8] FIG. 2 is a left side cross-sectional view showing the configuration of a grain sieve and a wind direction unit according to one embodiment of the present invention. [Figure 9] FIG. 2 is a top perspective view showing a grain sieve and a wind direction unit according to an embodiment of the present invention. [Figure 10] FIG. 10 is an enlarged view of a portion of FIG. 9. [Figure 11] FIG. 1 is a perspective view showing a wind direction plate according to an embodiment of the present invention. [Figure 12] FIG. 10 is a side cross-sectional view showing a modified example of the fixing structure of the wind direction plate according to one embodiment of the present invention. [Figure 13] FIG. 10 is a partial left side cross-sectional view showing the configuration of a modified example of an oscillating sorting device according to an embodiment of the present invention. [Figure 14] FIG. 10 is a partial perspective view from above front left showing the configuration of a modified example of an oscillating sorting device according to an embodiment of the present invention. [Figure 15] 1 is a plan cross-sectional view showing the configuration of a winnower speed-changing belt device according to one embodiment of the present invention. [Figure 16] 1 is a plan cross-sectional view showing the configuration of a winnower speed-changing belt device according to one embodiment of the present invention. [Figure 17] FIG. 2 is a left perspective view showing a fixed pulley according to an embodiment of the present invention. [Figure 18] FIG. 2 is a right perspective view showing a fixed pulley according to an embodiment of the present invention. [Figure 19] FIG. 2 is a left perspective view showing a movable pulley according to an embodiment of the present invention. [Figure 20] FIG. 2 is a right perspective view showing a movable pulley according to an embodiment of the present invention. [Figure 21] FIG. 1 is a perspective view showing a guide pin according to an embodiment of the present invention. [Figure 22] FIG. 10 is a plan cross-sectional view showing the configuration of a modified example of a winnowing speed-changing belt device according to an embodiment of the present invention. [Figure 23] FIG. 10 is a left perspective view showing a fixed pulley according to a modified example of a winnowing speed-changing belt device according to an embodiment of the present invention. [Figure 24] FIG. 10 is a right side view showing a fixed pulley according to a modified example of a winnowing speed-changing belt device according to an embodiment of the present invention. [Figure 25]FIG. 10 is a plan cross-sectional view showing the configuration of a comparative example of a winnowing speed-changing belt device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention aims to obtain stable sorting accuracy by providing a wind direction section in the grain sieve that acts on the sorting wind from the winnowing machine in a shaking sorting device installed in a sorting section that sorts threshed material by a threshing section. The following describes an embodiment of the present invention.

[0016] The overall configuration of the combine harvester 1 according to this embodiment will be described using Figures 1 to 5. In the following description, the left side (lower side in Figure 3) and the right side (upper side in Figure 3) when facing the front of the combine harvester 1 will be referred to as the left side and right side of the combine harvester 1, respectively.

[0017] As shown in Figures 1 and 2, the combine harvester 1 according to this embodiment is a conventional combine harvester that rakes harvested field crops (rice, wheat, soybeans, corn, etc.) into the machine body, threshes, sorts, stores the grain, and can then be transported outside the machine as needed. The combine harvester 1 has a self-propelled traveling body 2 and a reaping unit 3 attached to the front end of the traveling 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 traveling body 2 so that it can be raised and lowered.

[0018] The traveling machine body 2 includes a traveling unit 4 configured as a crawler-type traveling device having a pair of left and right crawler units 5, 5. A machine body frame 6 is installed between the left and right crawler units 5, 5. Each crawler unit 5 has multiple rotating bodies including a drive sprocket 5a provided at its front end, and tracks 5c wound around these rotating bodies. The drive sprocket 5a is rotated by receiving power from an engine 25 provided in the combine harvester 1.

[0019] On the left side of the machine frame 6, there are provided a threshing unit 7 that threshes the stalks cut and supplied by the reaping unit 3, and a sorting unit 8 that sorts the grains threshed by the threshing unit 7. The threshing unit 7 and sorting unit 8 are arranged behind the reaping unit 3, with the threshing unit 7 on the upper level and the sorting unit 8 on the lower level.

[0020] 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 that stores the grain (clean grain) sorted by the sorting section 8. A lower discharge conveyor 11 is provided within the grain tank 10 to transport the stored grain toward the discharge outlet of the grain tank 10 (see Figure 4). A vertical transport conveyor 12 is installed upright 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 installed so as to be rotatable horizontally and swingable up and down around a horizontal axis. These conveyors transport the grain in the grain tank 10, and the grain is discharged into a truck bed, a container, etc. from a paddy discharge port 14 installed at the tip of the grain discharge conveyor 13.

[0021] A driver's section 15, where 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 control handle 18 located in front of the driver's seat 17, and various operating sections such as a main speed change lever 19, an auxiliary speed change lever, and a work clutch lever (see Figure 2). The work clutch lever is a work operating tool for switching on and off the threshing clutch 57 and the reaping clutch 75 (see Figure 4).

[0022] An engine 25 serving as a drive source is provided below the driver's section 15 on the machine frame 6. The engine 25 is installed in the space below the driver's section 15, in the space on the right side of the front part of the machine frame 6. The engine 25 is, for example, a diesel engine.

[0023] The following describes the reaping unit 3. The reaping unit 3 has a feeder 30 as a conveying device, a platform 31 as a grain header, a cutting blade device 32, a pair of left and right grass dividing bodies 33, 33, and a raking reel .

[0024] The feeder 30 is a supply and conveyance 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 (see Figure 4) for transporting the stalks that is provided within the feeder house 35. The feeder house 35 is configured in a substantially rectangular cylindrical shape with the longitudinal direction extending in the front-to-rear direction in a plan view. The feeder 30 is located to the left of the cabin 16 (see Figure 3), and the rear end opening of the feeder house 35 is connected to the front handling opening 7a of the threshing section 7 (see Figure 1).

[0025] The platform 31 is configured in the shape of a horizontally elongated bucket, 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 platform 31. The raking auger 37 is mounted on a shaft that is rotatable with the left-right direction as the rotation axis.

[0026] The cutting blade device 32 is mounted on the front lower edge of the platform 31 and is configured like a pair of clippers. A pair of left and right grass dividing bodies 33, 33 are mounted so as to protrude forward from the left and right sides of the front of the platform 31. The raking reel 34 is a reel with a tine bar and is mounted in a position above and in front of the raking auger 37. The raking reel 34 is supported rotatably with the left and right directions as the rotation axis between the tips of a pair of left and right reel support arms 34a, 34a whose base ends are pivotally supported on the platform 31. As it rotates, the raking reel 34 continuously acts on the pod-bearing portions of the stalks and rakes the pod-bearing portions of the stalks toward the raking auger 37. The operation of each part of the reaping unit 3 uses power from the engine 25, transmitted via various transmission mechanisms.

[0027] A front rotor 26 is provided behind the feeder 30 to send the stalks transported by the conveyor 36 into the threshing opening 7a. The front rotor 26 is provided between the end of the conveyor 36 and the threshing opening 7a. The front rotor 26 has a roughly cylindrical rotor body 27, also known as a beater, and a front rotor shaft 28 (see Figure 4) whose axial direction is in the left-right direction. The stalks transported by the feeder 30 are fed from the end of the conveyor 36 by the front rotor 26 through the threshing opening 7a and into the threshing chamber 7b of the threshing section 7.

[0028] The conveyor 36 in the feeder house 35 has a reaping unit input shaft (feeder house conveyor shaft) 38, which is provided in front of the threshing unit 7 and has an axial direction in the left-right direction, as a drive shaft supporting the end of the feeding end of the conveyor 36. The rear end of the feeder 30 is supported rotatably relative to the traveling machine body 2, with the reaping unit input shaft 38 as the rotation axis. In addition, a lifting cylinder 39 (see Figure 1), which is a hydraulic cylinder, is interposed between the underside of the feeder house 35 and the machine body frame 6.

[0029] The reaping unit 3 is configured to move up and down by the rotation of the feeder 30 relative to the traveling body 2 as the lifting cylinder 39 extends and retracts. By the lifting and lowering operation of the reaping unit 3, the reaping unit 3 moves up and down around the reaping unit input shaft 38 as a pivot shaft, thereby adjusting the height of the reaping unit 3. The lifting and lowering operation of the reaping unit 3 is operated by a predetermined operating unit provided in the driving unit 15.

[0030] The threshing section 7 and the sorting section 8 will now be described. The threshing section 7 has a threshing drum 40 provided in a threshing chamber 7b with a threshing opening 7a opening to the front, and a receiving net 42 disposed below the threshing drum 40. The threshing chamber 7b is formed by a machine frame 21 provided on the machine frame 6.

[0031] The threshing drum 40 is rotatably supported by a threshing drum shaft 41 whose axial direction is the front-to-rear direction. The threshing drum 40 has a cylindrical main body with the threshing drum shaft 41 aligned along its central axis, and multiple threshing drum rods 40a protrude from the outer periphery of the main body. On the upper side of the threshing drum 40, multiple dust discharge valves 22 are provided which are angle-adjustable relative to the top surface 7c of the threshing chamber 7b to adjust the transport speed (retention time) of the de-grained grains in the threshing chamber 7b. The receiving net 42 allows the grains to drop through, and is provided along the outer periphery of the lower part of the threshing drum 40.

[0032] The sorting section 8 has a swinging sorting device 43 as a swinging sorting section arranged below the threshing section 7 via a receiving net 42, a swinging mechanism 44 including a swinging shaft 44a, a first conveyor 45, a second conveyor 46, and a winnowing machine 47. The swinging mechanism 44 rotates the swinging shaft 44a using rotational power from a drive source, causing the swinging sorting device 43 to swing back and forth in a predetermined direction, which is the front-to-back direction in a plan view. A pre-fan 71 is provided in front of the winnowing machine 47, and a second fan 72 is provided behind the winnowing machine 47.

[0033] The oscillating sorting device 43 has a configuration for gravity sorting, which includes an upper feed pan 111, a chaff sieve 120 arranged behind the upper feed pan 111 to adjust the amount of grain leakage, a lower feed pan 112 arranged below the chaff sieve 120, and a grain sieve 130 arranged below the chaff sieve 120.

[0034] The first conveyor 45 is disposed in a first trough 45b extending in the width direction of the machine body so as to collect the first grains (first grains). The second conveyor 46 is disposed in a second trough 46b extending in the width direction of the machine body at a position rearward of the first conveyor 45 so as to collect the second grains (second grains). The winnower 47 blows a sorting airflow from the lower front to the upper rear toward the oscillating sorting device 43.

[0035] A return conveyor 48 is provided on the right side of the machine body where the threshing section 7 and sorting section 8 are located (see Figure 4). 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 is located near the front end of the threshing drum 40, extending in an upward-facing incline. A grain lifting conveyor 49 extending vertically is provided to the right of the return conveyor 48. The grain lifting conveyor 49 transports the first grain sent by the first conveyor 45 into the grain tank 10.

[0036] The combine harvester 1 having the above-described configuration raises the reaping unit 3 to a desired height above the ground (the height at which the culms, the harvested crop, will be harvested) in a field by raising and lowering the feeder 30 with the reaping unit input shaft 38 as the center (support shaft), changing 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 separates the harvested crop into reaping targets and non-reaping targets using the left and right dividing bodies 33, 33, and raks in the pod-bearing portions of the culms on the tip side of the reaping targets using the raking reel 34 while reaping the pod-bearing portions of the culms using the cutting blade device 32.

[0037] The pod-bearing portions of the stalks harvested at the desired harvesting position are raked into the platform 31 by the rotating raking auger 37, and are collected near the intake port of the feeder house 35 within the platform 31 by the feeding action of the raking auger 37, and are taken into the feeder house 35 through the intake port. The stalks taken into the feeder house 35 are passed through the feeder house 35 by the conveyor 36, and are thrown into the threshing port 7a by the front rotor 26, and are supplied to the threshing section 7.

[0038] The pod-bearing portions of the stalks supplied to the threshing section 7 are threshed by the threshing section 7. Specifically, the stalks supplied to the threshing section 7 are transported rearward by the rotating threshing drum 40 and threshed mainly between the threshing drum 40 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 by the transport action of the threshing drum 40 from a dust outlet 8a (see Figure 5) located at the rear of the sorting section 8.

[0039] Meanwhile, the grains that have been threshed in the threshing section 7 and that have leaked through the receiving net 42 are sorted in the sorting section 8. Specifically, the threshed grains that have been threshed in the threshing drum 40 and that have leaked through the receiving net 42 are sorted by gravity sorting action by the oscillating sorting device 43 and wind sorting action by the winnower 47 into refined grains and other grains (first grain), a mixture of grains and straw, such as grains with stalks (second grain), and straw dust, and are removed.

[0040] The grains (first grain) that fall from the oscillating sorting device 43 after sorting in the sorting section 8 are transported to the grain tank 10 by the first conveyor 45 and the connected grain lifting conveyor 49. The second grains are returned to the threshing start end of the threshing drum 40 by the second conveyor 46 and the connected return conveyor 48, and are threshed again. Straw dust and the like are discharged into the field from a dust outlet provided at the rear of the sorting section 8.

[0041] Next, the power transmission configuration of the combine harvester 1 according to this embodiment will be described with reference to Figure 4. The combine harvester 1 uses rotational power from an engine 25 to drive the reaping unit 3, traveling unit 4, threshing unit 7, sorting unit 8, and grain storage unit 9.

[0042] The engine 25 has a first output shaft 25a and a second output shaft 25b. The rotational power of the first output shaft 25a is transmitted to the traveling unit 4, the threshing unit 7, the sorting unit 8, and the reaping unit 3. The rotational power of the second output shaft 25b is transmitted to the grain storage unit 9. The engine 25 also has a work implement pump shaft that drives a charge pump 54 that operates the lifting cylinder 39 and the like.

[0043] Regarding the power transmission system to the traveling unit 4, the rotational power of the first output shaft 25a is transmitted to the HST input shaft 52 by the first belt transmission mechanism 51 and input to the transmission 53, which includes the traveling HST and the swing HST. Here, "HST" refers to a hydraulic continuously variable transmission that uses a system in which hydraulic pressure generated by driving a hydraulic pump is converted back into rotational power by a hydraulic motor. The driving force of the transmission 53 rotates the drive sprocket 5a of the crawler unit 5 that constitutes the traveling unit 4.

[0044] Regarding the power transmission system to the threshing unit 7, the rotational power of the first output shaft 25a is transmitted to the threshing unit input shaft 56 by a 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 output shaft 25a to the threshing unit input shaft 56 intermittently as desired.

[0045] The rotational power of the threshing section input shaft 56 is transmitted to the threshing drum input shaft 59 by a third belt transmission mechanism 58. The rotational power of the threshing drum input shaft 59 is transmitted to the threshing drum shaft 41 via a threshing transmission device 60 by a first bevel gear 115 fixed to the threshing drum input shaft 59 and a second bevel gear 116 fixed to the threshing drum shaft 41. The threshing transmission device 60 changes the speed of the rotational power input from the threshing drum input shaft 59 to the threshing drum shaft 41, for example, between two stages, high speed and low speed.

[0046] With this configuration, the driving force of the engine 25 is transmitted to the threshing unit 7. Then, by operating the work clutch lever provided on the driving unit 15, the threshing clutch 57 is turned ON / OFF, thereby interrupting the transmission of power to the threshing unit 7.

[0047] With regard to the power transmission system to the sorting section 8, the threshing section input shaft 56 has a support shaft portion for the winnower 47, and the rotational power of the threshing section input shaft 56 is transmitted to a pulley rotor 63 journaled on a threshing intermediate shaft 62 by a fourth belt transmission mechanism 61. The rotational power of the pulley rotor 63 is transmitted to the pre-fan 71 and the winnower 47 by a predetermined transmission mechanism. In addition, the rotational power of the threshing section input shaft 56 is transmitted to the respective rotational shafts of the first conveyor 45, the second fan 72 and the second conveyor 46 by a predetermined transmission mechanism.

[0048] The rotational power of the first conveyor 45 is transmitted to the grain lifting conveyor 49 by a predetermined transmission mechanism. The rotational power of the second conveyor 46 is transmitted to the swing shaft 44a of the swing mechanism 44 by a fifth belt transmission mechanism 64. The rotational power of the second conveyor 46 is transmitted to the return conveyor 48 via a bevel gear.

[0049] With regard to the power transmission system to the reaping unit 3, the rotational power of the pulley rotor 63 is transmitted to the front rotor shaft 28 by a sixth belt transmission mechanism 73. The sixth belt transmission mechanism 73 is provided with a reaping clutch 75 that optionally intermittently transmits the rotational power of the pulley rotor 63 to the front rotor shaft 28. The rotational power of the front rotor shaft 28 is transmitted to the reaping unit input shaft 38 by a first chain transmission mechanism 65. The rotational drive of the reaping unit input shaft 38 operates the conveyor 36 in the feeder house 35.

[0050] The rotational power of the cutting unit input shaft 38 is transmitted to a PF (platform) drive shaft 67 by a second chain transmission mechanism 66. The rotational power of the PF drive shaft 67 is transmitted to a PF auger shaft 37a that rotates the sweeping auger 37 via a third chain transmission mechanism 68. The rotational power of the PF drive shaft 67 is also transmitted to a cutting blade drive shaft 32a that drives the cutting blade device 32 via a seventh belt transmission mechanism 69. The rotational power of the PF drive shaft 67 is also transmitted to a reel shaft 34b that rotates the sweeping reel 34 by a fourth chain transmission mechanism 76 that includes a reel counter shaft 70.

[0051] With this configuration, the driving force of the engine 25 is transmitted to the reaping unit 3. Then, by operating the work clutch lever provided on the driving unit 15, the reaping clutch 75 is turned on / off, thereby connecting and disconnecting the power transmission to the reaping unit 3.

[0052] With regard to the power transmission system to the grain storage section 9, the rotational power of the second output shaft 25b is transmitted to the lower discharge conveyor 11 by a power transmission mechanism including a grain tank intermediate shaft 77, and the rotational power of the lower discharge conveyor 11 is transmitted to the vertical transport conveyor 12 via a bevel gear. The rotational power of the vertical transport conveyor 12 is transmitted to the grain discharge conveyor 13 by a predetermined transmission mechanism. The grain storage section 9 is equipped with a suction fan 78 and a compressor 79, which are driven by the rotational power transmitted from the grain tank intermediate shaft 77.

[0053] As described above, the combine harvester 1 according to this embodiment includes the threshing section 7 that threshes crops, the oscillating sorting device 43 that sorts the threshed material threshed by the threshing section 7, and the winnower 47 that blows sorting air to the oscillating sorting device 43. The oscillating sorting device 43 includes a chaff sieve 120 that sorts the threshed material, and a grain sieve 130 that is provided below the chaff sieve 120 and sorts the threshed material sorted by the chaff sieve 120.

[0054] In this configuration, the oscillating sorting device 43 has an airflow direction unit 200 provided in the grain sieve 130. The airflow direction unit 200 is configured to guide the sorting air from the winnower 47 upward. The configurations of the oscillating sorting device 43 and the airflow direction unit 200 will be described below with reference to Figs. 5 to 14. The cross-sectional view shown in Fig. 8 is a cross-sectional view of the grain sieve 130 and the airflow direction unit 200 shown in Fig. 9 taken along the line AA.

[0055] The oscillating sorting device 43 has a frame 140 configured to have a generally rectangular shape with the longitudinal direction in a plan view as the oscillating body, and constitutes an oscillating sorting board that oscillates in the longitudinal direction in a plan view. The frame 140 has left and right side plates 141, a front plate portion 142 provided between the front ends of the left and right side plates 141, and a rear plate portion 143 provided between the rear ends of the left and right side plates 141, and these plate portions form a generally rectangular frame shape.

[0056] The side plates 141 are elongated plate-like members with their longitudinal direction extending in the front-to-rear direction, and in side view have a horizontal upper edge and a front lower edge that slopes upward. The side plates 141 have vertical surfaces with their thickness direction extending in the left-to-right direction, and have an inner surface 141a and an outer surface. Various sorting components that make up the oscillating sorting device 43 are provided between the left and right side plates 141.

[0057] The frame 140 is connected at the lower rear end to a swinging mechanism 44. When the swinging mechanism 44 operates, the frame 140 and the various components for sorting supported by it swing together.

[0058] An upper feed pan 111 is provided at the front end between the left and right side plates 141. The upper feed pan 111 is a substantially horizontal plate-like member that is installed between the left and right side plates 141. The upper feed pan 111 is fixed to the left and right side plates 141 via a support plate or the like using fasteners such as bolts, welding, or the like.

[0059] A guide plate 111a that acts on the grains is erected on the upper feed pan 111. A sieve section 111b, which is made up of multiple straight rod-shaped sieve wires arranged in a comb-teeth pattern, is provided at the rear of the upper feed pan 111 so as to extend rearward. The multiple sieve wires that make up the sieve section 111b are arranged in parallel at predetermined intervals in the left-right direction. The upper feed pan 111 receives the material to be threshed that has fallen from the receiving net 42, and moves the material to the rear while leveling it as the oscillating sorting device 43 oscillates.

[0060] A lower feed pan 112 is provided below the upper feed pan 111. The lower feed pan 112 is a bent plate-like member installed between the left and right side plates 141. The lower feed pan 112 is provided in a state where it is fixed to the left and right side plates 141 by fasteners such as bolts, welding, or the like.

[0061] Lower feed pan 112 has a front inclined surface 112a that slopes gently downward to the rear and forms the front portion of lower feed pan 112, and a rear surface 112b that forms an obtuse angle with front inclined surface 112a, and these surfaces form a curved shape in side view. In the front-to-rear direction, the front portion of lower feed pan 112 is located below the rear portion of upper feed pan 111, and the rear portion extends further rearward than upper feed pan 111.

[0062] In the vertical direction, a chaff sieve 120 is provided at a height position between the upper feed pan 111 and the lower feed pan 112. The chaff sieve 120 is configured to adjust the amount of grain that leaks through, and has a plurality of chaff fins 121.

[0063] The chaff fins 121 are narrow rectangular plate-shaped members with the longitudinal direction in the left-right direction, and are installed between the left and right side plates 141 in an orientation that slopes downward toward the front. The multiple chaff fins 121 (for example, twenty or so) that make up the chaff sieve 120 are arranged in parallel at predetermined intervals in the front and rear. The chaff fins 121 are installed so that the angle of inclination can be adjusted.

[0064] In the front-to-rear direction, the chaff fins 121 at the front end of the chaff sieve 120 are positioned near the rear end of the upper feed pan 111, and the chaff fins 121 at the rear end are positioned rearward of the rear end of the grain sieve 130. As the oscillating sorting device 43 oscillates, the chaff sieve 120 sieves the threshed material sent from the upper feed pan 111 to separate it by specific gravity and the grains from impurities.

[0065] A front guide plate portion 145, which forms a downward sloping surface toward the first conveyor 45, is provided from below the rear of the chaff sieve 120 to below the grain sieve 130 (see Figure 5). The dehulled grain (first grain) that falls from the grain sieve 130 is guided to the first conveyor 45 by the front guide plate portion 145.

[0066] The front guide plate section 145 has a fixed guide plate 147 provided on the machine body side and a movable guide plate 148 provided on the shaking sorting device 43 side.

[0067] The fixed side guide plate 147 is a downwardly sloping surface formed by a plate-like member that continues to the rear side of the first trough 45b, and is provided between the left and right side plate portions 125 that are provided from the threshing section 7 to the sorting section 8. The fixed side guide plate 147 is provided in a state where it is fixed to the left and right side plate portions 125 by fasteners such as bolts, welding, etc.

[0068] The movable side guide plate 148 is attached to the left and right side plates 141 constituting the oscillating sorting device 43 via support brackets 150, which are support members. The support brackets 150 are provided below the rear end of the grain sieve 130 relative to the left and right side plates 141.

[0069] 7, the support bracket 150 has left and right side surface portions 151 that are fixed to the left and right side plates 141, and a support surface portion 152 that connects the left and right side surface portions 151 and receives the attachment of the movable-side guide plate 148. The support bracket 150 is a bent plate-like member that is bent into a substantially U-shape by the left and right side surface portions 151 and the support surface portion 152.

[0070] The side surface portion 151 is a generally pentagonal plate-like portion with the thickness direction in the left-right direction. The support surface portion 152 is a long, narrow rectangular plate-like portion with the length direction in the left-right direction, and is formed in a manner that bridges between the rear lower sides of the left and right side surface portions 151, and forms an inclined surface portion that follows the downward slope of the front guide plate portion 145.

[0071] The support bracket 150 has left and right side surface portions 151 each having a substantially pentagonal shape, with apexes 151a of the left and right side surface portions 151 facing downward, and the left and right side surface portions 151 are fixed to the left and right side plates 141, respectively, with fasteners such as bolts. For this purpose, each side surface portion 151 has two holes 151b, one at the front and one at the back, through which fasteners such as bolts pass. In a side view, the support bracket 150 is provided such that the lower portion of the side surface portion 151 protrudes downward from the lower edge portion 141b of the side plate 141 as a substantially triangular portion, and the apex 151a, which is the lower end of the substantially triangular protruding shape, is positioned below the lower edge portion 141b (see FIG. 6). In a side view, the apex 151a of the support bracket 150 coincides or substantially coincides with the lower edge portion 152a of the support surface portion 152.

[0072] In the support bracket 150, the upper end of the movable-side guide plate 148, which is a rectangular plate-shaped member, is fixed to the support surface portion 152 by fasteners such as bolts. For this reason, the support surface portion 152 is formed with four holes 152b at predetermined intervals in the left-right direction, through which fasteners such as bolts pass. The movable-side guide plate 148 is a rubber sag made of an elastic material such as rubber. The movable-side guide plate 148 extends diagonally downward and forward from the support surface portion 152 and overlaps the fixed-side guide plate 147 so as to cover most of the fixed-side guide plate 147, thereby constituting the front-side guide plate portion 145 together with the fixed-side guide plate 147.

[0073] A straw rack 126 is provided behind the chaff sieve 120. The straw rack 126 is located at the rear end between the left and right side plates 141. The straw rack 126 is composed of multiple straw rack members 126a provided at predetermined intervals in the left-right direction. The straw rack member 126a is a plate-like member with a zigzag uneven shape on the upper side, and is provided with its front end fixed to a support member 126b provided between the left and right side plates 141.

[0074] The straw rack 126 performs gravity sorting on the thawed grain sent from the chaff sieve 120 side. The straw rack 126 is configured to allow the second crop (grains with stalks and broken ears, etc.) which has a lighter specific gravity than the grains to flow down, and to send waste straw and the like outside the machine. Below the straw rack 126, a rear guide plate section 146 is provided, which forms a slope that slopes downward toward the second conveyor 46.

[0075] The rear guide plate 146 is composed of an inclined surface 146a fixed between the left and right side plates 141 and a guide plate 146b whose upper end is fixed to the inclined surface 146a. The guide plate 146b is a rubber sling made of an elastic material such as rubber. The removed grain that falls from the straw rack 126 is guided to the second conveyor 46 by the rear guide plate 146.

[0076] The grain sieve 130 receives the grains threshed by the threshing section 7, and is provided in the oscillating sorting device 43 as a sieve section for sorting the first grain. A chaff sieve 120 having a plurality of chaff fins 121 is provided above the grain sieve 130, and the grain sieve 130 further sorts the threshed grains sorted by the chaff sieve 120. The grain sieve 130 is located above the first conveyor 45, and distributes the threshed grains to the first conveyor 45 and the second conveyor 46.

[0077] The grain sieve 130 is a substantially flat member having a substantially rectangular plate-like outer shape, as shown in Fig. 9. The grain sieve 130 has a width dimension (left-right dimension) corresponding to the distance between the left and right side plates 141, 141.

[0078] The grain sieve 130 includes a plate-shaped grain sieve main body 131 having a number of holes 133 formed therethrough for sorting the threshed material. The grain sieve main body 131 is a flat, porous portion that forms almost the entire rectangular grain sieve 130 except for the four side surfaces, and has an upper surface 131a and a lower surface 131b as plate surfaces.

[0079] A large number of holes 133 are formed as perforations over most of the grain sieve body 131, excluding the front and rear edge portions. The large number of holes 133 are basically arranged in a two-dimensional lattice pattern along the rectangular outer shape of the grain sieve 130. The grain sieve 130 uses the group of holes 133 to drop grains to be stored in the grain tank 10, while leaving impurities other than grains on the grain sieve 130. The holes 133 have an opening shape that is approximately square or rectangular with rounded corners. However, the opening shape of the holes 133 is not particularly limited.

[0080] The grain sieve 130 has a leading edge 132 and a trailing edge 134 in the grain sieve main body 131, which are areas where the hole 133 is not formed. The leading edge 132 and the trailing edge 134 are each provided with a substantially constant width across the entire width direction (left-right direction) of the grain sieve 130. In the front-rear direction, the front end of the grain sieve 130 is located below the front part of the chaff sieve 120, and the rear end is located below the rear part of the chaff sieve 120.

[0081] In the Glensieve 130, a front bent surface portion 135 is formed on the front side of the Glensieve main body 131, bent downward at a right angle from the front end of the leading edge portion 132, and side bent surface portions 136 are formed on both the left and right sides of the Glensieve main body 131, bent downward at a right angle from the left and right ends of the Glensieve main body 131. In addition, a rear bent surface portion 137, which is a bent portion that is approximately L-shaped in side view, is formed on the rear side of the Glensieve main body 131. The rear bent surface portion 137 has, as a portion that is approximately L-shaped in side view, a vertical surface portion bent downward at a right angle from the rear end of the trailing edge portion 134 of the Glensieve main body 131, and a horizontal surface portion bent rearward at a right angle from the lower end of the vertical surface portion.

[0082] 8, the Grain Sheave 130 is supported on both the front and rear sides by a front support portion 161 and a rear support portion 162. The Grain Sheave 130 and its support structure are configured to be symmetrical or approximately symmetrical.

[0083] At the front support portion 161, the grain sieve 130 has the front edge portion 132 of the grain sieve main body 131 fixedly supported relative to the rear edge portion of the lower feed pan 112. The rear edge portion of the lower feed pan 112 overlaps the front edge portion 132 of the grain sieve main body 131, and the two are fixed to each other by a screw 163 and a nut 164. The screw 163 passes through the rear edge portion of the lower feed pan 112 and the front edge portion 132 of the grain sieve main body 131 and is threadedly engaged with the nut 164. The front edge portion 132 of the grain sieve main body 131 has four holes 132a, through which the screws 163 pass, formed at predetermined intervals in the left-right direction (see FIG. 9). The rear edge portion of the lower feed pan 112 has holes 112c, through which the screws 163 pass, formed at positions corresponding to the four holes 132a.

[0084] 8, the rear support portion 162 is provided with a receiving member 165 that supports the rear end portion of the grain sheave 130. The receiving member 165 is a linear member that is roughly L-shaped in side view, and is installed between the left and right side plates 141. The grain sheave 130 is supported by the receiving member 165 in a state where the rear curved surface portion 137 is placed on the receiving member 165 from above.

[0085] In addition, in the rear support portion 162, the grain sieve 130 has both left and right ends of the rear edge portion 134 of the grain sieve main body 131 fixedly supported by support brackets 166 fixed to the left and right side plates 141. The support brackets 166 have support piece portions 166a that protrude inwardly to the left and right from the inner surfaces 141a of the side plates 141 as portions that receive the fixed grain sieve 130. The support piece portions 166a are plate-shaped portions that follow the downward slope at the front of the grain sieve 130.

[0086] The grain sheave 130 has its rear edge portion 134 overlapping the support piece portion 166a from below, and is fixed to the support bracket 166 by a bolt 167 and a nut portion 166b. The bolt 167 passes through the rear edge portion 134 and the support piece portion 166a and is threaded into a nut portion 166b provided on the upper side of the support piece portion 166a. Holes 134a, through which the bolts 167 pass, are formed in the left and right corners of the rear edge portion 134 of the grain sheave main body 131 (see FIG. 9). Holes 166c, through which the bolts 167 pass, are formed in the left and right support piece portions 166a. In addition, between the bolt 167 and the rear edge portion 134 of the Glensieve main body 131, there is an L-shaped metal fitting 168 that fits along the rear edge portion 134 and each surface of the lateral bending surface portion 136 of the Glensieve main body 131, and a surface portion 168a that fits along the rear edge portion 134 is interposed with the bolt 167 passing through it.

[0087] The grain sieve 130 supported by the front support portion 161 and the rear support portion 162 as described above is provided in a downwardly inclined manner at an angle of, for example, about 5 to 10 degrees with respect to the horizontal direction. Note that the support structure of the grain sieve 130 in the oscillating sorting device 43 is not limited to this embodiment.

[0088] The oscillating sorting device 43 having the above-described configuration is provided so as to be detachable and attachable to the traveling machine body 2. As shown in FIG. 5, the oscillating sorting device 43 is removed from an opening 190 provided behind the oscillating sorting device 43 in the traveling machine body 2.

[0089] The opening 190 is a portion that forms a space continuous with the handling chamber 7b at the rear side of the handling chamber 7b, and is a portion that opens the storage space for the oscillating sorting device 43 below the handling chamber 7b toward the rear. The opening 190 is normally covered from the rear side by a rear cover 191 that covers the lower part of the back part of the traveling body 2.

[0090] By removing the rear cover 191, the opening 190 is opened. In this state, the fixing member that fixes the oscillating sorting device 43 to the machine body side is removed, and the oscillating sorting device 43 is pulled out rearward from the opening 190, whereby the oscillating sorting device 43 is removed from the traveling machine body 2. The removed oscillating sorting device 43 is pushed forward from the open opening 190, and the oscillating sorting device 43 is attached to the traveling machine body 2 by fixing it to the machine body side.

[0091] The following describes the wind direction section 200. The wind direction section 200 is a section that forms a guide surface 201 for guiding the sorting wind from the winnower 47 upward. The guide surface 201 is provided over a range that covers substantially the entire grain sieve main body 131 in the left-right direction.

[0092] The guide surface 201 is provided on the underside of the grain sieve main body 131 and extends downward from the lower surface 131b. The guide surface 201 is an inclined plane that slopes downward at a steeper angle than the grain sieve main body 131, which is provided with a downward slope toward the front. The guide surface 201 has a constant or approximately constant length extending downward throughout the entire length in the left-right direction. The guide surface 201 extends downward from the side bending surface portion 136 of the grain sieve main body 131, and its lower edge is positioned below the lower edge of the side bending surface portion 136. In this way, the wind direction portion 200 forming the guide surface 201 is provided on the underside 131b side of the grain sieve 130.

[0093] The guide surface 201 guides the sorting wind from the winnower 47 and the like, which is received from the front side below the grain sieve main body 131, diagonally upward and rearward along the slope. The sorting wind guided upward by the guide surface 201 passes through the hole 133 from the lower side of the grain sieve main body 131 toward the upper side (see arrow B1 in Figure 8).

[0094] As shown in Fig. 8, in a side view, the angle θ1 that the guide surface 201 makes with respect to the forward-downward inclined direction C1 of the grain sieve main body 131 is, for example, approximately 60°. The magnitude of the angle θ1 is not particularly limited. In this embodiment, the guide surface 201 is formed as a forward-downward inclined flat surface, but the guide surface 201 is not limited to a flat surface and may be a curved surface or a bent surface, as long as it has the effect of guiding the sorting wind from the winnower 47 toward the upper part of the grain sieve main body 131.

[0095] The airflow direction units 200 are provided at a plurality of locations in the front-rear direction. In this embodiment, the airflow direction units 200 are provided at two locations, one at the front and one at the rear.

[0096] 8, of the two wind direction sections 200, the front wind direction section 200A is provided in a position forward of the center of the grain sieve 130 in the front-to-rear direction, and the rear wind direction section 200B is provided in a position approximately in the center of the grain sieve 130 in the front-to-rear direction. The front and rear wind direction sections 200A, 200B are arranged so that the distance between the front end of the grain sieve 130 and the front wind direction section 200A is approximately the same as the distance between the front and rear wind direction sections 200A, 200B in the front-to-rear direction.

[0097] The positions of the front and rear airflow direction units 200 in the front-rear direction are not limited to those in this embodiment. The airflow direction units 200 may be provided in one location in the front-rear direction, or in three or more locations.

[0098] The wind direction unit 200 is composed of a wind direction plate 210, which is a wind direction member attached to the grain sieve 130. As shown in Figures 8 and 11, the wind direction plate 210 has a wind direction plate main body portion 211 that forms the guide surface 201, and a fixed surface portion 212 that is a fixed portion to the grain sieve main body portion 131. The wind direction plate 210 is a bent plate-like member that forms an obtuse angle with the wind direction plate main body portion 211 and the fixed surface portion 212 in a side view and has a predetermined plate thickness.

[0099] The wind direction plate 210 is a longitudinal member with its longitudinal direction in the left-right direction, and has approximately the same dimension in the longitudinal direction as the left-right dimension of the grain sieve main body 131. In the wind direction plate 210, the front surface 211a, which is the front plate surface of the wind direction plate main body 211, becomes the guide surface 201. The wind direction plate main body 211 has a rear surface 211b, which is the plate surface opposite the front surface 211a.

[0100] The fixing surface portion 212 is a surface portion that fits along the grain sieve main body portion 131, and is fixed to the grain sieve main body portion 131 with an upper surface 212a as a contact surface with a lower surface 131b of the grain sieve main body portion 131. The fixing surface portion 212 has a lower surface 212b, which forms the back surface of the wind direction vane 210 together with the rear surface 211b of the wind direction vane main body portion 211, as the surface opposite the upper surface 212a.

[0101] The fixing surface portions 212 are provided at multiple locations as rectangular protruding pieces that protrude rearward from the upper end of the airflow direction plate main body 211. In this embodiment, the fixing surface portions 212 are provided at four locations: the left and right ends and two locations in the middle of the airflow direction plate main body 211, and are arranged at equal or approximately equal intervals in the left-right direction (see FIG. 11). In this manner of forming the multiple fixing surface portions 212, a recess 213 that is long in the left-right direction and whose rear side is open is formed by the fixing surface portions 212 adjacent in the left-right direction and the rear edge portions 211c of the fixing surface portions 212. Note that the number and shape of the fixing surface portions 212 are not limited to those in this embodiment.

[0102] The fixed surface portion 212 has a dimension in the length direction, which is the direction in which it protrudes rearward from the wind direction plate main body portion 211, that is approximately half the length dimension of the wind direction plate main body portion 211 in a side view of the wind direction plate 210 (the dimension extending downward from the grain sieve main body portion 131). Also, the fixed surface portion 212 has a dimension in the left-right direction, i.e., the longitudinal direction of the wind direction plate main body portion 211, that is approximately the same as the length of one side of the approximately square-shaped general hole portions 133A that make up the majority of the multiple hole portions 133 that the grain sieve main body portion 131 has.

[0103] The wind direction vane 210 is attached to the Glensieve main body 131 by fixing the fixing surface portion 212 to the Glensieve main body 131 from the underside 131b side by welding such as spot welding. In the Glensieve main body 131, wind direction vane fixing portions 131c, which are portions where the hole portions 133 are not formed, are provided at locations corresponding to the four fixing surface portions 212 as areas that receive the fixing surface portions 212. In Figure 10, the fixing portions of the wind direction vane 210 to the Glensieve main body 131 by welding are indicated by "x".

[0104] There is no particular limitation on the method of fixing the wind direction vane 210 to the Glensieve main body 131. The fixing structure of the wind direction vane 210 to the Glensieve main body 131 may be a structure in which the wind direction vane 210 is detachably provided to the Glensieve main body 131.

[0105] Specifically, as a configuration in which the wind direction plate 210 is detachably provided, for example, as shown in FIG. 12, a structure in which the wind direction plate 210 is fixed to the grain sieve main body 131 by a bolt 221 and a nut portion 222 may be used.

[0106] 12, the bolt 221 passes through the wind direction plate fixing portion 131c of the grain sheave main body 131 and the fixing surface portion 212 of the wind direction plate 210 from above, and is screwed into a nut portion 222 provided on the lower surface 212b side of the fixing surface portion 212. The nut portion 222 is, for example, a welded nut welded to the fixing surface portion 212. The wind direction plate fixing portion 131c and the fixing surface portion 212 have holes 131d and 212d formed therein, respectively, through which the bolt 221 passes. A washer 223 is interposed between the wind direction plate fixing portion 131c and the head of the bolt 221 above the wind direction plate fixing portion 131c.

[0107] In this way, the wind direction plate 210 may be detachably attached to the grain sieve 130 by fasteners such as bolts 221. Note that with regard to the fastening structure of the wind direction plate 210 to the grain sieve 130, the number, arrangement, fastening manner, etc. of fastening parts using fasteners such as bolts are not particularly limited.

[0108] As described above, the airflow direction unit 200 constituted by the airflow direction plate 210 is provided so that its lower end is positioned above the support bracket 150 that supports the movable side guide plate 148 in the vertical direction. That is, as described above, the oscillating sorting device 43 has the movable side guide plate 148, which is a guide plate provided below the grain sieve 130, and the support bracket 150 that supports the movable side guide plate 148 relative to the left and right side plates 141 of the oscillating sorting device 43, and the airflow direction unit 200 is provided so that its lower end is positioned above the lower ends of the support bracket 150.

[0109] In a configuration in which two wind direction sections 200 are provided at the front and rear of the Glensieve main body 131 that is inclined downward toward the front, the front wind direction section 200A is positioned lower than the rear wind direction section 200B in the vertical direction. As shown in Fig. 6, the lower end of the front wind direction section 200A is positioned above the height position D1 of the lower end of the support bracket 150.

[0110] The lower end of the front airflow direction section 200A is the lower edge of the airflow direction plate main body 211 of the airflow direction plate 210 that forms the airflow direction section 200A. The lower end of the support bracket 150 is the lower end of the apex 151a of the approximately triangular left and right side surface sections 151. In this embodiment, the front airflow direction section 200A is positioned such that most of the lower side of the airflow direction plate main body 211 is lower than the lower edge 141b of the side plate 141 in the up-down direction, and the lower end of the airflow direction plate main body 211 is positioned directly above height position D1 of the lower end of the support bracket 150 (see FIG. 6).

[0111] In the above-described configuration in which the grain sieve 130 is provided with the wind direction section 200, the formation mode of the numerous holes 133 formed in the grain sieve main body 131 has been devised in relation to the wind direction section 200. That is, in the grain sieve 130, of the numerous holes 133, the grain sieve main body 131 has some of the holes 133 located upstream of the wind direction section 200 in the flow of sorting wind from the winnower 47, i.e., on the front side, as enlarged hole sections 133B with a larger opening area than the other hole sections 133.

[0112] The enlarged hole 133B is formed in the grain sieve main body 131 in a position immediately in front of the wind direction plate fixing portion 131c to which the wind direction plate 210 is attached. That is, the enlarged hole 133B is formed as the hole 133 in the row (lined up in the left-right direction) closest to the front of the wind direction plate fixing portion 131c in a two-dimensional lattice arrangement of a large number of holes 133. Therefore, the enlarged hole 133B is arranged in a row immediately in front of each of the wind direction portions 200 provided at two locations, front and rear, and is formed in two rows in the grain sieve main body 131.

[0113] In this embodiment, the enlarged hole portion 133B has a larger left-right dimension than the general hole portion 133A, which is the other hole portion 133, thereby making the opening area larger than the other hole portions 133. The enlarged hole portion 133B is formed to have a rectangular opening shape with the left-right direction as the longitudinal direction, compared to the square-shaped general hole portion 133A.

[0114] Specifically, the enlarged hole portion 133B has the same or approximately the same dimensions in the front-rear direction as the square-shaped general hole portion 133A, and the same or approximately the same dimensions in the left-right direction as three of the general hole portions 133A. In other words, the enlarged hole portion 133B has opening dimensions in the left-right direction that are equivalent to the combined (connected) dimensions of three consecutive general hole portions 133A.

[0115] The enlarged holes 133B are formed to match the two-dimensional lattice arrangement of the numerous general holes 133A. The enlarged holes 133B are formed so that three are consecutive in each range between adjacent airflow direction plate fixing portions 131c in the left-right direction, in relation to the airflow direction plate fixing portions 131c provided at four locations on each airflow direction plate 210. The multiple enlarged holes 133B are formed so that the spacing between adjacent enlarged holes 133B and the spacing between adjacent enlarged holes 133B and general holes 133A match the spacing between adjacent general holes 133A.

[0116] According to the combine harvester 1 according to this embodiment having the above-described configuration, stable sorting accuracy can be obtained in the sorting section 8, and sorting efficiency can be improved.

[0117] In the oscillating sorting device 43, the grain sieve 130, which is provided below the chaff sieve 120, is provided with an airflow direction unit 200 that guides the sorting airflow from the winnower 47 and other devices upward. With this configuration, the airflow direction unit 200 swings integrally with the grain sieve 130 during the swinging operation of the oscillating sorting device 43, allowing for a constant positional relationship between the group of holes 133 formed in the grain sieve main body 131 and the airflow direction unit 200. This provides a good guide function for the sorting airflow from the winnower 47 and other devices, stabilizing sorting accuracy and improving sorting efficiency. Furthermore, the configuration in which the airflow direction unit 200 is provided on the grain sieve 130 eliminates the need for a separate guide member such as an airflow direction plate in the oscillating sorting device 43. The sorting airflow can be guided with a simple configuration, thereby improving sorting processing capacity.

[0118] In particular, the configuration in which the wind direction unit 200 is provided in the grain sieve 130 according to this embodiment is preferably used in harvesting crops that have high rachis-branch tension and generate a lot of dust, among the crops to be harvested by the combine harvester 1. In other words, by using this configuration in harvesting of such crops, it is possible to suppress a decline in sorting processing capacity and obtain good sorting performance.

[0119] The wind direction unit 200 is provided on the underside of the grain sieve 130. With this configuration, wind blowing up from the underside of the grain sieve 130 can be efficiently generated as sorting wind for the grain sieve 130, which is provided with a downward slope toward the front, thereby effectively improving sorting processing capacity. The wind direction unit 200 may have a portion located on the upper surface 131a side of the grain sieve main body 131.

[0120] Furthermore, in the grain sieve 130, the grain sieve main body 131 has, among the many holes 133, the hole 133 located on the upwind side of the airflow direction section 200 with respect to the flow of sorting air from the winnower 47 or the like, as an enlarged hole section 133B. With this configuration, the opening area of ​​the hole 133, which is the flow path area for the sorting air, can be partially enlarged in front of or just in front of the airflow direction section 200, where the wind guiding effect of the airflow direction section 200, which blows the sorting air up from the underside of the grain sieve main body 131, is relatively large and the wind speed becomes high.

[0121] This ensures the rigidity of the grain sieve 130 while allowing the sorting wind guided by the wind direction unit 200 to act effectively on the threshed material on the grain sieve main body 131. As a result, it is possible to effectively improve the sorting processing capacity. By improving the sorting processing capacity, it is possible to reduce the load on the process after the sorting unit 8 in the grain processing process, and reduce harvest loss.

[0122] The grain sieve main body 131 has two types of hole portions 133: general hole portions 133A and enlarged hole portions 133B, and the enlarged hole portions 133B have a larger opening area by being larger in the left-right dimension than the general hole portions 133A. With this configuration, the enlarged hole portions 133B can be easily formed while maintaining the shape and orderly arrangement of the numerous general hole portions 133A, making it possible to effectively improve sorting processing capacity.

[0123] Furthermore, the wind direction unit 200 may be configured such that the wind direction plate 210 is detachably attached to the grain sieve 130 (see FIG. 12). With such a configuration, by preparing multiple types of wind direction plates 210 with different extension lengths, areas, inclination angles, etc. of the guide surfaces 201, the wind direction plates 210 can be easily replaced depending on the variety, moisture value, etc. of the crop to be harvested. This allows the wind direction unit 200 to effectively guide the sorting wind depending on the variety, moisture value, etc. of the crop, thereby improving the stability of sorting accuracy and sorting efficiency.

[0124] In addition, the airflow direction units 200 are provided at multiple locations in the front-to-rear direction. With this configuration, the airflow direction units 200 can guide the sorting airflow over a relatively wide range of the areas where the holes 133 are formed in the grain sieve main body 131. This makes it possible to effectively improve sorting processing capacity.

[0125] Furthermore, the airflow direction unit 200 is arranged so that its lower end is positioned higher than the lower end of the support bracket 150 that supports the movable side guide plate 148 relative to the left and right side plates 141. With this configuration, it is possible to prevent the airflow direction unit 200 from coming into contact with other components of the machine body when removing or attaching the oscillating sorting device 43 from the opening 190 on the rear side of the traveling machine body 2 as described above. This ensures ease of installation and removal of the oscillating sorting device 43 relative to the traveling machine body 2.

[0126] Furthermore, the wind direction plate 210 constituting the wind direction unit 200 has a plurality of protruding piece-like fixing surface portions 212 partially provided in the left-right direction on the wind direction plate main body 211 as a fixing portion to the grain sieve main body 131. With this configuration, it is possible to prevent the holes 133 from being blocked from below or the range of the holes 133 from being narrowed, compared to, for example, a configuration in which the fixing surface portions 212 are provided over the entire wind direction plate main body 211 in the left-right direction, i.e., a configuration in which the fixing surface portions 212 are provided as an integral part without forming recesses 213 (see FIG. 11 ). This makes it possible to ensure the opening range of the plurality of holes 133, and to obtain good ventilation in the grain sieve main body 131. As a result, the wind direction unit 200 can effectively guide the sorting wind, thereby effectively improving the sorting processing capacity.

[0127] (Modification of the shaking separator) The configuration of a modified example of the shaking sorting device 43 according to this embodiment will be described with reference to FIGS.

[0128] As shown in Figures 13 and 14, in the modified shaking separator 43, a sieve 250 is provided above the front of the grain sieve 130. The sieve 250 is provided over substantially the entire grain sieve 130 in the left-right direction. The sieve 250 has a fixed plate portion 251 and a sieve portion 252, which together form an obtuse-angled curved line shape in side view. The sieve 250 is composed of a curved plate-like sieve member 255 that forms the fixed plate portion 251 and the sieve portion 252.

[0129] The fixed plate portion 251 is a rectangular plate-shaped portion with the left-right direction as the longitudinal direction, and the left-right dimension is approximately the same as the left-right dimension of the grain sieve 130. The sieve portion 252 has a base portion 253 that forms the front edge of the sieve portion 252, and a plurality of sieve wire portions 254 that extend rearward from the base portion 253, and has a comb-like shape.

[0130] The base 253 is a plate-like portion formed in the same range as the fixed plate portion 251 in the left-right direction, and forms an extension base for the multiple sieve line portions 254. The base 253 is connected to the rear side of the fixed plate portion 251 and forms an obtuse-angled curved surface portion together with the fixed plate portion 251. The sieve line portions 254 are linear portions extending in a predetermined direction from the base 253. The multiple sieve line portions 254 are formed on the same plane as the base 253 and are arranged in parallel at predetermined intervals in the left-right direction.

[0131] The sieve member 255 constituting the sieve 250 has a fixed plate portion 251 fixedly supported on the rear edge portion of the lower feed pan 112 at the front support portion 161 of the grain sieve 130, similar to the grain sieve 130. The sieve member 255 is fastened together with the grain sieve main body 131 to the lower feed pan 112 with the fixed plate portion 251 overlapping the rear edge portion of the lower feed pan 112 by screws 163 and nuts 164 for fastening the grain sieve main body 131 to the lower feed pan 112. That is, the screws 163 pass through the fixed plate portion 251 of the sieve member 255, the rear edge portion of the lower feed pan 112, and the front edge portion 132 of the grain sieve main body 131, and are threadedly engaged with the nuts 164. The fixing plate portion 251 of the sieve member 255 has holes 251a formed at four positions corresponding to the holes 132a of the front edge portion 132 of the grain sieve body portion 131, through which the screws 163 pass.

[0132] The sieve 250 has multiple sieve lines 254 positioned between the front of the grain sieve 130 and the front of the chaff sieve 120. In the sieve 250, the multiple sieve lines 254 are arranged so as to form a steep incline with respect to the inclination direction C1 of the grain sieve main body 131, which slopes downward from the front. In the example shown in FIG. 13, the angle θ2 that the multiple sieve lines 254 form with respect to the inclination direction C1 of the grain sieve main body 131, which slopes downward from the front, is, for example, about 10°. The magnitude of the angle θ2 is not particularly limited.

[0133] The sieve 250 has a plurality of sieve wire portions 254 extending in the front-rear direction so that the leading ends (rear ends) of the plurality of sieve wire portions 254 are positioned above the front airflow direction portion 200A. Note that the extension length of the plurality of sieve wire portions 254 is not particularly limited.

[0134] As described above, with the configuration in which the sieve 250 is provided below the chaff sieve 120 and above the grain sieve 130, the sieve 250 acts on the threshed material leaking from the chaff sieve 120 above the front of the grain sieve 130, and performs sieving sorting in conjunction with the swinging of the swinging sorting device 43. This, combined with the guiding action of the wind direction section 200 for the sorting wind, makes it possible to effectively improve the sorting processing capacity.

[0135] Moreover, the sieve 250 is provided with a plurality of sieve wires 254 extending to a position above the front wind direction section 200A. With this configuration, the sieving action of the sieve 250 can be obtained in a location where the influence of the wind direction section 200A's guiding action of the sorting wind is relatively large, so that the sorting processing capacity can be effectively improved.

[0136] (Configuration of winnower variable speed belt device) The combine harvester 1 is provided with a winnowing speed change device (air volume adjustment device) for adjusting the air volume of the winnowing machine 47 by changing the rotation speed of the winnowing machine 47. The winnowing speed change device has a split pulley attached to a rotating shaft that supports the winnowing machine 47. The split pulley receives a belt winding together with other pulleys. The winnowing speed change device is configured as a belt continuously variable transmission mechanism that changes the speed ratio by operating the split pulley to change the belt winding radius.

[0137] The winnowing speed change device has a split pulley that is attached to the rotating shaft of the winnowing machine 47 and receives the belt wound around it, a cam mechanism that changes the width (groove width) of the split pulley, an actuator that operates the cam mechanism, and a transmission mechanism that transmits the power of the actuator to the cam mechanism. The split pulley has a fixed pulley that is fixed to the rotating shaft of the winnowing machine 47, and a movable pulley that is not rotatable relative to the rotating shaft of the winnowing machine 47 but is movable in the axial direction, and the groove width of the split pulley, i.e., the belt winding radius, is changed by moving the movable pulley relative to the fixed pulley.

[0138] In a winnowing speed change device of this type, there is a configuration in which a guide pin that functions as a guide member for the axial movement of the movable pulley relative to the fixed pulley is provided between both pulleys (see, for example, JP 2011-83226 A). The guide pin has an axial direction parallel to the rotation axis of the winnowing machine 47, is fixed to the fixed pulley, and is provided in a state that it penetrates the movable pulley, and multiple guide pins are arranged around the rotation axis.

[0139] The configuration with multiple guide pins between the fixed pulley and the movable pulley has the following problems. For example, when the groove width of the split pulley is at its widest, i.e., when the belt's winding radius around the split pulley is at its smallest and the winnower 47's airflow is at its largest, the belt is positioned closest to the center (closest to the rotating shaft) of the split pulley. When the belt is positioned close to the center of the split pulley, for example, if excessive torque is generated in the split pulley, the belt may bite into the split pulley and the inner side of the belt (inner peripheral side) may come into contact with the guide pin. Contact of the belt with the guide pin can accelerate belt wear. In particular, if the belt is a toothed belt, contact with the guide pin can cause damage to the teeth (protruding portions).

[0140] Therefore, the winnowing speed variable belt device of this embodiment aims to provide a configuration that is equipped with a guide pin as a guide member for the split pulley, and that can prevent the belt wound around the split pulley from coming into contact with the guide pin.

[0141] The winnowing speed-variable belt device 300 according to this embodiment will be described with reference to Figs. 15 to 25. The winnowing speed-variable belt device 300 constitutes a winnowing speed-variable device (air volume adjustment device) for adjusting the air volume of the winnowing machine 47 by changing the rotation speed of the winnowing machine 47 (see Fig. 5). As shown in Fig. 15, the winnowing speed-variable belt device 300 includes a rotating shaft 301 that supports the winnowing machine 47, a split pulley 302 that is provided on the rotating shaft 301 and receives the winding of a belt 305, and a cam mechanism 303 that changes the width (groove width) of the split pulley 302. The winnowing speed-variable belt device 300 constitutes a belt continuously variable transmission mechanism that varies the speed ratio by operating the split pulley 302 to change the winding radius of the belt 305.

[0142] The rotating shaft 301 extends in the left-right direction of the machine body, with the left-right direction as its axial direction. The winnower 47 is mounted on the rotating shaft 301 so as to rotate integrally with the rotating shaft 301. The left side (the right side in FIG. 15) of the rotating shaft 301 protrudes from the left side plate 125 of the left and right side plate portions 125 (see FIG. 5) of the threshing section 7 and the sorting section 8. A split pulley 302 and a cam mechanism 303 are mounted on the portion of the rotating shaft 301 protruding from the left side plate portion 125.

[0143] The split pulley 302 receives the belt 305 together with other pulleys (not shown). The split pulley 302 has a fixed pulley 311 as a first pulley fixed to the rotary shaft 301, and a movable pulley 312 as a second pulley that is non-rotatable relative to the rotary shaft 301 but movable in the axial direction. The fixed pulley 311 and the movable pulley 312 have an outer shape of a rotating body with their central axes coinciding with the axis of the rotary shaft 301.

[0144] Fixed pulley 311 and movable pulley 312 are disposed opposite each other on rotating shaft 301, with movable pulley 312 provided to the right (left side in FIG. 15 ) of fixed pulley 311. When movable pulley 312 moves relative to fixed pulley 311, the groove width of split pulley 302, i.e., the winding radius of belt 305 around split pulley 302, changes.

[0145] 15, 17, and 18, fixed pulley 311 has a base 321 that forms a central portion of fixed pulley 311 and has a substantially disk-shaped outer shape, and a plate-shaped flange 322 that is provided on the outer periphery of base 321. Fixed pulley 311 has base 321 that protrudes from flange 322 on the left side, and has a fixed-side clamping surface 323 on the right side that clamps belt 305 together with movable pulley 312.

[0146] Fixed-side clamping surface 323 has a flat truncated cone shape with its apex on the right side. Fixed-side clamping surface 323 is formed so that substantially the entire surface, excluding the inner peripheral edge portion in the radial direction of fixed pulley 311, forms the right side surface of flange portion 322. Flange portion 322 has, on its left side surface, outer peripheral side surface portion 324 and inner peripheral side surface portion 325, both of which are surfaces perpendicular to the axial direction of rotation shaft 301. Inner peripheral side surface portion 325 forms the bottom surface of a shallow annular recess relative to outer peripheral side surface portion 324, and causes base portion 321 to protrude leftward.

[0147] The fixed pulley 311 is fixed to the rotary shaft 301 in a state where it passes through the left end of the rotary shaft 301 and is positioned in the axial direction of the rotary shaft 301. A support hole 326, through which the rotary shaft 301 passes, is formed in the center of the base 321 of the fixed pulley 311. The fixed pulley 311 is fixed to the rotary shaft 301 by a fastening member 327 that screws into a male threaded portion 301a formed on the left end of the rotary shaft 301. A washer 328, through which the male threaded portion 301a passes, is interposed between the fastening member 327 and the fixed pulley 311. In addition, a retaining ring 329 that locks the fixed pulley 311 to the rotary shaft 301 is provided on the side of the fixed pulley 311 opposite the fastening member 327.

[0148] A key 330 that restricts relative rotation between the rotating shaft 301 and the fixed pulley 311 is provided between the rotating shaft 301 and the fixed pulley 311. The key 330 is fitted into key grooves 301b, 326a that are formed on the outer circumferential surface of the rotating shaft 301 and the inner circumferential surface of the support hole 326 of the fixed pulley 311, respectively.

[0149] The base 321 of the fixed pulley 311 has a circular end face 331 that forms the left end face of the fixed pulley 311, a cylindrical peripheral wall 332 that forms a step between the flange 322 and the base 321, and a cylindrical boss 333 that protrudes rightward from the center of the end face 331. The boss 333 forms the majority of the support hole 326 through which the rotating shaft 301 passes, and the right end face serves as a locking surface for the fixed pulley 311 to engage with the rotating shaft 301 via a retaining ring 329.

[0150] In the base portion 321, an annular recess 334 is formed by the end face portion 331, the peripheral wall portion 332, and the boss portion 333. The annular recess 334 is an annular recess with the right side open, and is formed by the right side surface of the end face portion 331, the inner peripheral surfaces of the flange portion 322 and the peripheral wall portion 332, and the outer peripheral surface of the boss portion 333.

[0151] As shown in Figures 15, 19 and 20, the movable pulley 312 has a disk-shaped pulley main body 341 that forms a movable side clamping surface 343 that acts on the belt 305, a support tube portion 342 that protrudes cylindrically to the right from the center of the pulley main body 341, and an annular protrusion 344 that protrudes to the left from the pulley main body 341.

[0152] The movable-side clamping surface 343 has a flat truncated cone shape with its apex on the left side, faces the fixed-side clamping surface 323, and is provided as a surface having a shape that is approximately symmetrical to the fixed-side clamping surface 323 in the axial direction of the rotating shaft 301. The pulley main body 341 has, on its right side, an outer peripheral side surface 345 and an inner peripheral side surface 347, both of which are surfaces perpendicular to the axial direction of the rotating shaft 301. The inner peripheral side surface 347 forms the bottom surface of a shallow circular recess relative to the outer peripheral side surface 345, and causes the support cylinder 342 to protrude rightward.

[0153] The movable pulley 312 is provided so that the rotary shaft 301 passes through it and is movable in the axial direction of the rotary shaft 301. A support hole 346, through which the rotary shaft 301 passes, is formed in the center of the movable pulley 312. Most of the support hole 346 is formed in the support cylinder portion 342. Cylindrical bushings 350, through which the rotary shaft 301 passes, are interposed between the rotary shaft 301 passing through the support hole 346 and the movable pulley 312, at two locations on the left and right ends of the support hole 346.

[0154] The annular protrusion 344 is formed as a portion that can fit into the annular recess 334 of the fixed pulley 311. The outer shape and dimensions of the annular protrusion 344 are substantially the same as the recess shape of the annular recess 334. The annular protrusion 344 has an outer peripheral surface 344a and an inner peripheral surface 344b, both of which are cylindrical, and an annular protruding end surface 344c that is the left end surface (see FIG. 19). The inner peripheral surface 344b of the annular protrusion 344 forms a recess 344d whose bottom surface is the left opening end surface of the support hole 346.

[0155] The fixed pulley 311 and the movable pulley 312 having the above-described configuration form a V-shaped groove 340 around which the belt 305 is wound by the fixed clamping surface 323 and the movable clamping surface 343 that face each other.

[0156] As the movable pulley 312 moves leftward and closer to the fixed pulley 311, the groove width of the groove 340 narrows, the winding radius of the belt 305 increases, and the rotation speed of the rotating shaft 301 decreases (see FIG. 15). When the movable pulley 312 approaches the fixed pulley 311, the annular protrusion 344 of the movable pulley 312 fits into the annular recess 334 of the fixed pulley 311, and the boss 333 of the fixed pulley 311 fits into the recess 344d of the movable pulley 312. As the movable pulley 312 moves rightward and away from the fixed pulley 311, the groove width of the groove 340 widens, the winding radius of the belt 305 decreases, and the rotation speed of the rotating shaft 301 increases (see FIG. 16). FIG. 15 shows the grooves 340 in the fully closed state, ie, the winnower 47 in the lowest speed state, and FIG. 16 shows the grooves 340 in the fully opened state, ie, the winnower 47 in the highest speed state.

[0157] Cam mechanism 303 has fixed speed-change cam 351 fixed to the machine body, and movable speed-change cam 352 movable integrally with movable pulley 312 in the axial direction of rotation shaft 301. Fixed speed-change cam 351 and movable speed-change cam 352 have substantially the same shape and are arranged substantially symmetrically in the axial direction of rotation shaft 301. Fixed speed-change cam 351 and movable speed-change cam 352 are arranged opposite each other on rotation shaft 301, with fixed speed-change cam 351 being provided to the right of movable speed-change cam 352.

[0158] Fixed speed-change cam 351 has a substantially annular or cylindrical base 353, fixed piece 354 which is a plate-like protrusion protruding from base 353 on both the front and rear sides, and multiple cam protrusions 355. Fixed speed-change cam 351 has rotating shaft 301 passing through the center of base 353, and is supported rotatably relative to rotating shaft 301 via a cylindrical sleeve 361 fitted onto the rotating shaft 301 and a bearing 362 fitted onto the sleeve 361. Bearing 362 is fitted onto the inner periphery of base 353 and locked by a retaining ring 363. A cylindrical locking member 364 fitted onto the rotating shaft 301 is provided on the right side of sleeve 361.

[0159] The fixed speed-changing cam 351 has front and rear fixed pieces 354 fixed to a support plate 366 by bolts 365. The bolts 365 pass through the fixed pieces 354 and the support plate 366 and are screwed into nuts 367 provided on the support plate 366. The support plate 366 is fixed to a support frame 368 provided on the traveling machine body 2 side by welding or the like.

[0160] Cam protrusion 355 is a protruding piece that protrudes leftward from base 353 and has the shape of a part of a cylindrical peripheral wall. Cam protrusion 355 is a portion that engages with movable speed-change cam 352 and has cam surface 355a that is formed inclined with respect to rotation shaft 301. Cam protrusions 355 are provided at three locations equiangularly spaced apart in the circumferential direction of base 353.

[0161] The movable speed-change cam 352 has a substantially annular or cylindrical base 373, a fixed piece 374 that is a plate-like protrusion protruding from the base 373 on both the front and rear sides, and multiple cam protrusions 375. The tip (right end) of the support cylinder 342 of the movable pulley 312 passes through the center of the base 373, and the movable speed-change cam 352 is supported via a bearing 382 fitted to the tip of the support cylinder 342 in a state where it can rotate relative to the support cylinder 342 and where movement in the axial direction of the rotary shaft 301 is restricted. A stepped reduced-diameter portion 342a that receives the bearing 382 is formed at the tip of the support cylinder 342 (see FIG. 20 ). The bearing 382 is fitted to the inner periphery of the base 373 and is locked by a retaining ring 383.

[0162] The movable speed-change cam 352 is provided so as to move around the axis of the rotary shaft 301 upon receiving rotational power from an actuator (not shown) constituted by a motor or the like. The rotational power of the actuator is transmitted to the movable speed-change cam 352 via a transmission mechanism. An arm plate 384 constituting the transmission mechanism is fixed to the fixed piece portion 374 of the movable speed-change cam 352 by a bolt 385 and a nut 386. The bolt 385 passes through the fixed piece portion 374 and the arm plate 384 and is threadedly engaged with the nut 386.

[0163] One end of a connecting rod 387 constituting the transmission mechanism is rotatably connected to the arm plate 384 by a connecting pin 388. The other end of the connecting rod 387 is connected to a predetermined transmission member (not shown) that is a component of the transmission mechanism and operates upon receiving power from the actuator.

[0164] Cam protrusion 375 is a protruding piece that protrudes rightward from base 373 and has the shape of a portion of a cylindrical peripheral wall. Cam protrusion 375 is a portion that engages with cam protrusion 355 of fixed speed-change cam 351, and has cam surface 375a that is formed to be inclined with respect to rotation shaft 301. Cam protrusions 375 are provided at three locations equiangularly spaced apart in the circumferential direction of base 373.

[0165] The fixed speed-change cam 351 and the movable speed-change cam 352 configured as described above are engaged with each other with the cam surfaces 355a, 375a of the corresponding cam protrusions 355, 375 in contact with each other. When the movable speed-change cam 352 receives power from the actuator via the connecting rod 387 or the like and rotates around the axis of the rotary shaft 301, the fixed speed-change cam 351 and the movable speed-change cam 352 move in the axial direction of the rotary shaft 301, with the cam surfaces 355a, 375a acting as sliding surfaces for each other due to the action of the cam protrusions 355, 375. Here, the movable speed-change cam 352 moves axially integrally with the movable pulley 312. This changes the rotational speed of the winnower 47 as described above. The actuator of the winnower speed-change device is operated, for example, by a speed-change operating unit for the winnower 47 provided in the driving unit 15.

[0166] In the winnower speed-changing belt device 300 having the above-described configuration, a guide pin 390 is provided between the fixed pulley 311 and functions as a guide member for the axial movement of the movable pulley 312 relative to the fixed pulley 311. As shown in Fig. 21, the guide pin 390 has a hexagonal head 391 like the head of a bolt, and a linear shaft 392 in the shape of a straight rod extending from the head 391.

[0167] The guide pins 390 have their axial direction parallel to the rotation shaft 301, are fixed to the fixed pulley 311, and penetrate the movable pulley 312, and are arranged in plurality around the axis of the rotation shaft 301. In this embodiment, five guide pins 390 are arranged around the axis of the rotation shaft 301 at equal angular intervals in the circumferential direction.

[0168] The guide pin 390 penetrates the end surface 331 of the base 321 from the left side of the fixed pulley 311 and is fixed to the end surface 331. The end surface 331 of the fixed pulley 311 has holes 331a formed therein, through which the guide pin 390 passes. The holes 331a are formed in a portion of the end surface 331 that is on the outer circumferential side of the portion where the boss 333 is formed. The holes 331a are formed in five locations at equal angular intervals in the circumferential direction.

[0169] Hole 331a of fixed pulley 311 is formed as a female screw hole with a screw thread cut on the inner peripheral surface. In contrast, a male screw portion 393 with a screw thread cut on the outer peripheral surface is provided at the base of linear shaft portion 392 of guide pin 390 (see FIG. 21 ). Guide pin 390 is fastened and fixed to fixed pulley 311 by threading male screw portion 393 into hole 331a. A washer 395, through which guide pin 390 passes, is interposed between end face portion 331 and head 391 of guide pin 390. The linear shaft portion 392 of guide pin 390 protrudes rightward from fixed pulley 311 and is inserted into movable pulley 312.

[0170] A guide hole 349 into which the guide pin 390 is inserted is formed in the movable pulley 312. The guide hole 349 is formed to penetrate the movable pulley 312 in the radial direction at the location where the annular protrusion 344 is formed, with its left side opening facing the protruding end face 344c of the annular protrusion 344 and its right side opening facing the inner peripheral side surface 347. The guide hole 349 is formed as a cylindrical opening that is open only on both the left and right sides so as to cover the guide pin 390 over the entire circumferential direction of the guide pin 390.

[0171] The guide hole 349 has a hole diameter that is substantially the same as (slightly larger than) the outer diameter of the guide pin 390 so as to allow relative movement of the movable pulley 312 with respect to the guide pin 390. The guide hole 349 is formed at five locations at equal angular intervals in the circumferential direction in accordance with the arrangement of the holes 331a in the fixed pulley 311.

[0172] The annular protrusion 344 of the movable pulley 312 has a protruding dimension from the pulley body 341, which is the dimension in the axial direction of the rotary shaft 301, that is approximately the same as the depth dimension of the annular recess 334 of the fixed pulley 311, which is also the dimension in the axial direction. Furthermore, the annular protrusion 344 has a protruding dimension from the pulley body 341 that positions at least a portion (the left end) within the annular recess 334 of the fixed pulley 311 when the movable pulley 312 is at its farthest position from the fixed pulley 311 (see FIG. 16 ). With this configuration, when the movable pulley 312 is spaced apart from the fixed pulley 311, the outer peripheral surface 344a of the annular protrusion 344 is the surface that is exposed on the inner peripheral side of the groove 340 of the split pulley 302.

[0173] As described above, the relative rotation of the movable pulley 312 with respect to the fixed pulley 311 is restricted by the plurality of guide pins 390 provided for the fixed pulley 311 and the movable pulley 312. In other words, the relative rotation of the movable pulley 312 with respect to the rotary shaft 301 is restricted via the fixed pulley 311 fixed to the rotary shaft 301.

[0174] According to the winnowing speed-changing belt device 300 having the above-described configuration, in a configuration in which a guide pin 390 is provided for the split pulley 302, it is possible to prevent the belt 305 wound around the split pulley 302 from coming into contact with the guide pin 390.

[0175] For example, as shown in Fig. 25, a configuration in which the annular protrusion 344 is not provided on the movable pulley 312 is assumed as a comparative example to the winnowing speed-variable belt device 300 according to the present embodiment. For convenience, the comparative example uses the same reference numerals as those of the winnowing speed-variable belt device 300 according to the present embodiment.

[0176] 25, the movable pulley 312 has, on its left side, which faces the fixed pulley 311, a movable clamping surface 343 and a flat surface 348 that is the inner peripheral surface of the movable clamping surface 343 and is perpendicular to the axial direction of the rotation shaft 301. In this configuration, for example, as shown in FIG. 25, when the groove width of the groove 340 of the split pulley 302 is at its maximum, the linear shaft portion 392 of the guide pin 390 is exposed on the inner peripheral side of the groove 340 between the fixed pulley 311 and the movable pulley 312.

[0177] Therefore, for example, when excessive torque is generated in the split pulley 302, the belt 305 located on the central side of the split pulley 302 may bite into the split pulley 302, and the ventral side of the belt 305 may come into contact with the guide pin 390. The contact of the belt 305 with the guide pin 390 may cause the belt 305 to wear out more quickly.

[0178] Therefore, in the winnower speed-variable belt device 300 according to this embodiment, the movable pulley 312 is configured to have the annular protrusion 344, so that the middle portion of the linear shaft portion 392 of the guide pin 390 is covered by the annular protrusion 344, and therefore, regardless of the operating state of the split pulley 302, the guide pin 390 can be prevented from being exposed to the groove portion 340 between the fixed pulley 311 and the movable pulley 312. This prevents the belt 305 from coming into contact with the guide pin 390, thereby suppressing wear of the belt 305.

[0179] Furthermore, even if the belt 305 bites into the inner periphery of the split pulley 302, the belt 305 is supported by the outer periphery 344a of the annular protrusion 344. Therefore, wear of the belt 305 can be suppressed compared to when the belt 305 comes into contact with the guide pin 390.

[0180] (Modification of winnower speed-changing belt device) The configuration of a modified winnowing speed-changing belt device 300 according to this embodiment will be described with reference to Figs. 22 to 24. This modified example is a modified example of the configuration of the fixed pulley 311. The fixed pulley 311 of the modified example is referred to as a fixed pulley 311A.

[0181] 22 to 24, fixed pulley 311A ​​is formed with an opening 335 that opens annular recess 334 to face the outside. Opening 335 is formed in a portion of base 321 of fixed pulley 311A ​​to the left of the portion where flange 322 is formed in the direction of the central axis of fixed pulley 311A. Opening 335 is formed in a portion of annular recess 334 other than the right-side open portion, with annular recess 334 having an open right side, so as to open annular recess 334 to face the outside.

[0182] 23 and 24, openings 335 are formed at five locations at equal angular intervals in the circumferential direction of fixed pulley 311A. Furthermore, openings 335 are formed at the center phase between adjacent holes 331a with respect to the arrangement of the five holes 331a in the circumferential direction of fixed pulley 311A.

[0183] In the base 321 of the fixed pulley 311A, recessed portions 336 are formed as the formation sites of the openings 335 (see FIG. 23). The recessed portions 336 are recesses formed by cutting out the base 321, which is formed as a portion protruding to the left from the flange portion 322, so as to form a substantially V-shaped recess when viewed in the direction of the central axis of the fixed pulley 311A ​​(when viewed from the left side). The recessed portion 336 is mainly formed by a curved side surface portion 336a that is substantially V-shaped when viewed from the left side of the fixed pulley 311A, and a fan-shaped surface portion 336b that is substantially fan-shaped along an arc when viewed from the left side of the fixed pulley 311A. An opening 335 is formed through the bottom portion of the recessed portion 336.

[0184] Opening 335 has an opening shape that follows a curved line corresponding to the shapes of each surface of curved side surface portion 336a and sector-shaped surface portion 336b that form recessed portion 336, and has a substantially elliptical opening shape with the circumferential direction of fixed pulley 311A ​​as its longitudinal direction. In annular recess 334, opening 335 is formed at a corner portion along the circumference formed by right side surface 334a of end surface portion 331 that forms the bottom surface of annular recess 334, and inner circumferential surface 334b ​​of flange portion 322 and peripheral wall portion 332.

[0185] In this configuration having five recesses 336, end surface 331 of base 321 is generally star-shaped when viewed from the left side of fixed pulley 311A. Peripheral wall 332 of base 321 is partially formed in five separate locations as a portion connecting adjacent recesses 336 in the circumferential direction of fixed pulley 311A. Recesses 336 are formed so as not to affect the annular recess shape of annular recess 334, i.e., so as not to create any protrusions on the annular recess 334 side. In fixed pulley 311A, the left side of flange 322 forms a flush side surface 337 that is perpendicular to the axial direction of rotation shaft 301.

[0186] As described above, by providing an opening 335 in the fixed pulley 311A, impurities such as dust that have entered the annular recess 334 can be discharged to the outside of the fixed pulley 311A ​​through the opening 335, thereby ensuring good operability for the speed change operation of the winnowing speed change belt device 300.

[0187] In the split pulley 302, the annular protrusion 344 of the movable pulley 312 moves in and out of the annular recess 334 of the fixed pulley 311A ​​as the movable pulley 312 moves in the axial direction on the rotary shaft 301. As the annular protrusion 344 moves in and out, dust and other impurities generated during operation of the combine 1 may enter the annular recess 334 through the gap between the annular recess 334 and the annular protrusion 344.

[0188] Because the annular recess 334 of the fixed pulley 311A ​​is basically blocked from the right side by the annular protrusion 344 of the movable pulley 312, impurities that once enter the annular recess 334 are difficult to escape to the outside, and therefore there is a possibility that the impurities will accumulate (build up) in the annular recess 334. The impurities that build up in the annular recess 334 may cause an obstruction to the speed-changing operation of the winnowing speed-changing belt device 300. In particular, there is a possibility that the impurities in the annular recess 334 will obstruct the movement of the movable pulley 312 toward the fixed pulley 311A, preventing the groove width of the groove 340 of the split pulley 302 from narrowing sufficiently, resulting in insufficient deceleration.

[0189] Therefore, with a configuration such as fixed pulley 311A ​​in which opening 335 is formed to open annular recess 334 to the outside, foreign matter in annular recess 334 can be discharged to the outside through opening 335 by centrifugal force generated by rotating fixed pulley 311A ​​and a pushing action by annular protrusion 344 that enters annular recess 334 as movable pulley 312 moves (see arrow E1 in FIG. 23). This makes it possible to prevent foreign matter in annular recess 334 from interfering with the movement of movable pulley 312, thereby maintaining smooth speed change operation in winnower speed change belt device 300. Note that the shape of opening 335 in fixed pulley 311A ​​and the location where opening 335 is formed are not limited to this example.

[0190] The above-described embodiment is an example of the present invention, and the present invention is not limited to the above-described embodiment. Therefore, even if it is not the above-described embodiment, various modifications are possible depending on the design, etc., as long as they do not deviate from the technical idea of ​​the present invention. Furthermore, the effects described in this disclosure are merely examples and are not limited, and other effects may also be obtained.

[0191] The present technology can be configured as follows: The configurations described below can be selected and combined as desired.

[0192] (1) A combine harvester comprising a threshing unit that threshes crops, a swinging sorting device that sorts the threshed crops by the threshing unit, and a winnower that blows sorting air to the swinging sorting device, The shaking sorting device comprises: A chaff sieve to separate the threshed material, A grain sieve is provided below the chaff sieve and separates the threshed material separated by the chaff sieve; a wind direction section provided in the grain sieve and guiding the sorting wind from the winnower upward; A combine harvester characterized by: (2) The wind direction section is provided on the underside of the grain sieve. The combine harvester according to (1) above. (3) The grain sieve includes a plate-shaped grain sieve body having a number of holes formed therethrough for sorting threshed material, In the grain sieve main body, among the many holes, some of the holes located upstream of the flow of the sorted wind with respect to the wind direction part are enlarged holes having a larger opening area than the other holes. The combine harvester according to (1) or (2) above, characterized in that: (4) The enlarged hole portion has a larger opening area than the other hole portions by making the left-right dimension of the enlarged hole portion longer than the other hole portions. The combine harvester according to (3) above. (5) The wind direction unit is configured by a wind direction member attached to the grain sheave, The wind direction member is detachably provided to the grain sieve. The combine harvester according to any one of (1) to (4) above, (6) The airflow direction units are provided at a plurality of locations in the front-rear direction. The combine harvester according to any one of (1) to (5) above, [Explanation of symbols]

[0193] 1. Combine 7. Threshing Department 43 Swinging sorting device 47 Karawinoo 120 Chaff Thieves 130 Glensieve 131 Glensieve main body 131b bottom (bottom of Glensieve) 133 Hole 133A General hole 133B Enlarged hole 148 Movable side guide plate (guide plate) 150 Support bracket (support member) 200 Wind direction section 210 Wind deflector (wind deflector)

Claims

1. A combine harvester comprising a threshing unit that threshes crops, a swinging sorting device that sorts the threshed crops by the threshing unit, and a winnower that blows sorting air to the swinging sorting device, The shaking sorting device comprises: A chaff sieve to separate the threshed material, A grain sieve is provided below the chaff sieve and separates the threshed material separated by the chaff sieve; a wind direction section provided in the grain sieve and guiding the sorting wind from the winnower upward; A combine harvester characterized by:

2. The wind direction section is provided on the underside of the grain sieve. The combine harvester according to claim 1 .

3. The grain sieve includes a plate-shaped grain sieve body having a number of holes formed therethrough for sorting threshed material, In the grain sieve main body, among the many holes, some of the holes located upstream of the flow of the sorted wind with respect to the wind direction part are enlarged holes having a larger opening area than the other holes. The combine harvester according to claim 1 or 2.

4. The enlarged hole portion has a larger opening area than the other hole portions by making the left-right dimension of the enlarged hole portion longer than the other hole portions. The combine harvester according to claim 3 .

5. The wind direction unit is configured by a wind direction member attached to the grain sheave, The wind direction member is detachably provided to the grain sieve. The combine harvester according to claim 1 .

6. The airflow direction units are provided at a plurality of locations in the front-rear direction. The combine harvester according to claim 1 .

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