Combine harvester

Abstract

To discharge dust from a thresher to the outside in an easily recoverable state after harvesting.SOLUTION: A traveling machine body V including a pair of left and right traveling devices and a threshing device 4 for threshing reaped crops are provided, the threshing device 4 is provided on the traveling machine body V in a state of being biased to either left or right with respect to a center position in a machine body lateral width direction, a dust discharge cover 60 for receiving dust discharged from the threshing device 4 and discharging the dust outward from a downward opening port 65 is provided behind the threshing device 4, and the dust discharge cover 60 is provided with left and right side plates 61,62 extending downward on both left and right side portions of the opening port 65. A lower end of the inner side plate 62 positioned inside in the machine body left-right direction of the left and right side plates 61 and 62 is positioned above a lower end of the outer side plate 61 positioned outside in the machine body left-right direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a combine harvester having a traveling body with a pair of left and right traveling devices and a threshing device that threshes harvested crops. [Background technology]

[0002] The combine harvester has a reaping section at the front of a traveling body equipped with a pair of left and right crawler traveling devices as traveling devices, and a threshing device that threshes the harvested crops and a grain storage section that stores the grains obtained by the threshing process are mounted and supported side by side on the traveling body. In other words, the threshing device is mounted on the traveling body in a state where it is biased to the left of the center position in the width direction of the machine body.

[0003] After threshing by the threshing device, dust such as discarded straw is discharged to the outside from the rear side of the threshing device's body, and a dust discharge cover is provided at the rear of the threshing device to receive the dust discharged from the threshing device and discharge it to the outside from the bottom side, with the side walls on both the left and right sides of the dust discharge cover having a long width in the vertical direction (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-244924 Summary of the Invention [Problem to be solved by the invention]

[0005] Recently, it has become undesirable to leave dust such as waste straw discharged into the fields as it is or to incinerate it, and so after harvesting, waste straw and other debris are collected using collection devices such as hay balers.

[0006] In the conventional configuration, the left and right side walls of the dust discharge cover are configured to be long in the vertical direction, so dust such as straw discharged from the rear of the threshing machine is discharged into the field within the area surrounded by the left and right side walls of the dust discharge cover. As a result, the dust may fall and accumulate on the field surface where the traveling device has trampled it. As a result, there are disadvantages such as the unevenness of the footprint making it difficult for the collector to collect the dust.

[0007] The object of the present invention is to discharge dust from the threshing machine to the outside in a state that makes it easy to collect after harvesting. [Means for solving the problem]

[0008] The characteristic configuration of the combine harvester of the present invention is that it comprises a running body with a pair of left and right running devices, and a threshing device for threshing harvested crops, the threshing device being mounted on the running body in a state where it is biased to either the left or right of the center position in the width direction of the body, a dust discharge cover being provided behind the threshing device which receives dust discharged from the threshing device and discharges it to the outside through a downward opening, the dust discharge cover being provided with left and right side panels extending downward on both the left and right sides of the opening, and the lower end of the inner panel of the left and right side panels located on the inside of the body in the left-right direction is located higher than the lower end of the outer panel located on the outside of the body in the left-right direction.

[0009] According to the present invention, the reaping operation is performed while the traveling machine body is traveling, and the dust after threshing is discharged to the outside from the rear side of the threshing device. At that time, the dust discharged from the threshing device is caught by the dust discharge cover provided at the rear of the threshing device and is discharged to the outside of the machine body from the open opening.

[0010] Of the left and right side plates of the dust discharge cover, the lower end of the inner plate located on the inside of the left-right direction of the machine body is located higher than the lower end of the outer plate located on the outside of the left-right direction of the machine body, so inside the dust discharge cover, the inner side in the width direction of the machine body is first free from guidance by the side plates, making it easier for dust to be discharged toward the center position on the left and right of the machine body.

[0011] As a result, the discharged dust is more likely to fall toward the center of the left and right sides of the machine body than toward the running gear. This allows the dust to fall into untouched areas between the running gears or onto stumps that have not been trampled by the running gear, making collection easier.

[0012] Therefore, it is possible to discharge dust from the threshing device to the outside in a state where it can be easily collected after harvesting.

[0013] In the present invention, it is preferable that the lower edges of the left and right side plates are provided in an inclined position so that the rear ends are positioned higher.

[0014] With this configuration, dust is discharged from a relatively high position, so dust discharged toward the center of the left and right sides of the machine body is more likely to fall toward the center of the left and right sides of the machine body rather than the traveling device, making dust collection even easier.

[0015] In the present invention, it is preferable that the inner plate is provided in an inclined position in which the rearward side of the aircraft body is positioned more inward in the left-right direction of the aircraft body in a plan view.

[0016] According to this configuration, the inner plate is positioned further inward in the left-right direction of the machine body as it approaches the rear of the machine body, making it even easier to discharge dust toward the center position in the left-right direction of the machine body.

[0017] In the present invention, the threshing device is provided with a threshing section that threshes the harvested crops and a oscillating sorting section that separates the threshed material into grains and dust, and the oscillating sorting section is provided with a chaff sieve that roughly separates the threshed material and a grain sieve that is provided below the chaff sieve and performs fine sorting, and it is preferable that the upper edge of the opening is located at a higher position than the chaff sieve when viewed from the rear of the machine body.

[0018] According to this configuration, the upper edge of the opening is located higher than the chaff sieve, and the dust is discharged from the opening to the outside from a high position, so that the dust discharged from the opening is at a relatively high position, and the dust discharged toward the center position of the left and right of the machine body is more likely to fall toward the center position of the left and right of the machine body than toward the traveling device, making the dust collection work even easier.

[0019] In the present invention, it is preferable that a downward flow guide body be provided inside the dust discharge cover, extending from the outer plate toward the inner plate and positioned in an inclined position downward as it moves inward in the width direction of the aircraft body.

[0020] According to this configuration, the dust discharged from the threshing machine is guided downward from the outer side in the width direction of the machine body toward the inner side in the width direction of the machine body by the downward guide body provided in an inclined posture inside the dust discharge cover. As a result, the dust can be discharged toward the center position of the left and right of the machine body.

[0021] In the present invention, it is preferable that a soft sheet member be provided below the inner plate and extend downward.

[0022] According to this configuration, by providing a soft sheet member, it is possible to allow dust to be discharged toward the center position on the left and right sides of the body, while preventing dust from entering the interior of the body at the center position on the left and right sides of the body.

[0023] In the present invention, it is preferable that a fuel tank filler port is provided on the inside of the left-right direction of the body of the threshing device, adjacent to the inner plate of the dust discharge cover.

[0024] According to this configuration, the fuel tank can be placed in an empty space, for example, at the rear lower part or on the rear side of the threshing device, while the soft sheet member prevents dust from falling on the fuel tank's filler opening, thereby preventing dust from entering the fuel tank. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is an overall side view of a combine harvester. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] FIG. [Figure 7] FIG. 1 is a side view of the rear of the threshing device (the soft sheet member and fuel filler port are omitted). [Figure 8] FIG. 2 is a side view of the rear of the threshing device. [Figure 9] FIG. 10 is a cross-sectional plan view of a dust exhaust cover according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are illustrative of the preferred embodiments of the present invention. The present invention is not limited to the following embodiments, and various modifications are possible without departing from the spirit and scope of the present invention.

[0027] In the following explanation, unless otherwise specified, the direction of arrow F in the figure is "forward," the direction of arrow B is "backward," the direction of arrow L is "left," and the direction of arrow R is "right." The direction of arrow U in the figure is "upward," and the direction of arrow D is "downward."

[0028] [Overall structure] 1 and 2 show a conventional combine harvester for harvesting crops such as rice and wheat as an example of a combine harvester according to the present invention. This combine harvester is equipped with a reaping and transporting unit 3 at the front of a traveling body V, which is equipped with a pair of left and right crawler traveling devices 2 as traveling devices attached to the lower part of a machine frame 1. The combine harvester is equipped with a reaping and transporting unit 3 that reaps planted culms as the crop to be harvested and transports them rearward. The machine frame 1 is also equipped with a threshing device 4 that threshers the reaped culms transported from the reaping and transporting unit 3 and separates the threshed material into grain and dust such as straw (hereinafter referred to as straw), a grain tank 5 that stores the grains obtained by the threshing device 4, a grain discharge device 6 that discharges the grain stored in the grain tank 5 outside the combine, and a driving unit 7 that an operator rides on and operates the combine.

[0029] The driving unit 7 is located on the right front side of the machine body, and the grain tank 5 is provided behind the driving unit 7. A drive engine (not shown) is provided below the driving unit 7. In the traveling machine body V, the threshing device 4 is located on the left side and the grain tank 5 is located on the right side, with the threshing device 4 and the grain tank 5 lined up in the left-right direction. As shown in Figure 2, the threshing device 4 is provided on the traveling machine body V in a state where it is biased to the left side with respect to the center position in the width direction of the machine body.

[0030] This combine is configured as a whole-culm input type that cuts the base of planted culms, harvests them, and then feeds all of the harvested culms into a threshing device 4.

[0031] The harvesting and conveying section 3 is equipped with a harvesting processing section 9 that harvests the planted stalks as the machine moves, and a feeder 10 that conveys the harvested stalks harvested by the harvesting processing section 9 toward the threshing device 4 at the rear of the machine, and is supported so that it can be raised and lowered and swung around a horizontal axis by the extension and contraction of a hydraulic cylinder 11 for raising and lowering the harvester, which is installed across the machine frame 1 and the feeder 10.

[0032] [Threshing equipment] Next, the threshing device 4 will be described. As shown in Figures 3 and 4, the threshing device 4 has side walls 24, 25 located on both the left and right sides, a front wall 26 located at the front end, a rear wall 27 located at the rear end, and a top plate 28 located at the top, and in the internal space formed inside, a threshing section 29 that threshes the harvested crops is located at the top, and a sorting section 30 is located below that. The harvested stalks are transported by the feeder 10 and supplied into the threshing section 29 from an inlet 31 at the front end.

[0033] The threshing section 29 is provided with a threshing drum 32 that is driven to rotate about an axis X1 extending in the front-to-rear direction of the machine body to thresh the crops. The threshing drum 32 has a threshing drum shaft 33 that is rotatably supported about the axis X1 across the front wall section 26 and the rear wall section 27, and is configured to rotate integrally about the threshing drum shaft 33. The threshing drum shaft 33 is driven to rotate by power from the engine. The threshing drum 32 is driven to rotate rightward (clockwise) when viewed from the front of the machine body.

[0034] The threshing drum 32 is equipped with a plurality of support rods 34 that are distributed at equal intervals around the circumferential direction of the threshing drum 32, and bar-shaped threshing teeth 35 that are aligned in the axial direction of each support rod 34 and protrude outward. An arc-shaped receiving net 36 is provided on the lower half of the outer periphery of the threshing drum 32. Although not described in detail, the receiving net 36 is made of a mesh body with a large number of passage holes formed therein for the grains to pass through.

[0035] As shown in Figure 3, the sorting section 30, located below the threshing section 29, is equipped with a oscillating sorting device 38 as an oscillating sorting section that sorts the processed material that has leaked downward from the receiving net 36 while transporting it, a first grain recovery section 39 that recovers the first grain that has leaked from the oscillating sorting device 38, a second grain recovery section 40 that recovers second grain such as grain with branches that has leaked from the oscillating sorting device 38, and a winnower 41 that supplies sorting air to the oscillating sorting device 38.

[0036] The first grain recovery section 39 transports the recovered grains to the outside of the threshing device 4 by a cross feed screw 39a. After being transported to the outside of the threshing device 4, the grains recovered by the first grain recovery section 39 are transported upward by a grain transport device 39b and stored in the grain tank 5.

[0037] The second grain recovery section 40 transports the recovered second grain by a lateral feed screw 40a to the outside of the threshing device 4. After being transported to the outside of the threshing device 4, the second grain recovered by the second grain recovery section 40 is returned into the threshing section 29 by a second grain return device 40b and threshed.

[0038] The oscillating sorting device 38 has a sieve case 42 that is rectangular in shape when viewed from above, and inside the sieve case 42 are a first grain pan 43, a second grain pan 44, a sieve wire 45, a chaff sieve 46 for coarse sorting, a grain sieve 47 for fine sorting, a straw rack 48, etc.

[0039] The sheave case 42 is supported at its front end by a slide support mechanism (not shown) so that it can slide back and forth, and a crank-type swing drive unit 49 is provided at the bottom of the rear end of the sheave case 42. The operation of this swing drive unit 49 causes the rear end of the sheave case 42 to swing in a circular motion. Therefore, the entire sheave case 42 is configured to perform a forward-backward swing motion that includes a vertical component.

[0040] The first grain pan 43 is composed of a plate body formed into an approximately wave-shaped shape when viewed from the side, and is provided at the upstream end (front end) of the oscillating sorting device 38 in the direction of transport of the processed material, and transports the processed material that has leaked from the upstream side in the direction of transport in the threshing section 29 to the rear.

[0041] The sieve wire 45 is made of piano wire or the like and extends in a cantilevered manner from the downstream end of the first grain pan 43 in the transport direction toward the downstream side in the transport direction, transporting the processed material discharged from the first grain pan 43 backward while allowing the grains and second grains to leak downward.

[0042] The second grain pan 44, like the first grain pan 43, is composed of a plate body formed in an approximately corrugated shape when viewed from the side, and is located downstream and below the first grain pan 43 in the transport direction, and transports processed material that has leaked from the downstream side of the first grain pan 43 in the processed material transport direction and processed material that has leaked from the sieve wire 45 rearward.

[0043] The chaff sieve 46 is located downstream of the second grain pan 44 in the transport direction, and allows the grains and second grains to leak downward while swinging and transporting the processed material sent out from the second grain pan 44, the processed material that has leaked through the sieve line 45, and the processed material that has leaked through the receiving net 36 of the threshing section 29.

[0044] The grain sieve 47 is made of a crimped mesh with many openings for grain passage, and is positioned below the chaff sieve 46 and supported across the left and right side plates of the sieve case 42. The grain sieve 47 swings and transports the processed material that has leaked from the chaff sieve 46, causing the grain to leak downward to the first grain recovery section 39, and transporting the second grain to the second grain recovery section 40 downstream in the transport direction.

[0045] The straw rack 48 is provided downstream of the chaff sieve 46 in the transport direction. The straw rack 48 is made up of multiple sawtooth plates that can receive the material to be processed and swing backward to transport it. Any straw that does not leak through the straw rack 48 is discharged outward from the dust outlet at the rear.

[0046] A fuel tank 50 is disposed below the swing drive unit 49, utilizing the empty space below the sorting unit 30. The fuel tank 50 is placed and supported on a mounting base 51 fixed to the machine frame 1.

[0047] As shown in Figure 2, the fuel tank 50 has a fuel filler opening 52 provided on the right side of the fuel tank 50. A fuel filler pipe 53 extends rightward from the right side of the fuel tank 50, and extends further right than the right side wall 25 of the threshing device 4. The fuel filler pipe 53 extends upward, and the fuel filler opening 52 is provided so as to open upward. The fuel filler opening 52 is normally closed by a lid.

[0048] [Dust exhaust cover] A dust discharge cover 60 is provided behind the threshing device 4, which receives dust discharged from the threshing device 4 and discharges it to the outside through a downward-facing opening. As shown in FIGS. 1 to 3, the dust discharge cover 60 includes an outer plate 61 located on the left side of the machine body, i.e., the outer side in the width direction of the machine body; an inner plate 62 located on the right side of the machine body, i.e., the inner side in the width direction of the machine body; an upper plate 63 positioned downward toward the rear and having an inclined posture; and a rear plate 64 positioned at the rear and having a vertical posture; all of these are integrally connected. As shown in FIGS. 3 and 6, the cover body has an approximately U-shaped cross section in plan view, with the upper front side and lower side facing the threshing section 29 open. The dust discharge cover 60 forms an opening 65 with the lower side open, through which waste straw is discharged to the outside.

[0049] 3, the upper edge 65a of the opening 65 is located at a higher position than the chaff sieve 46 when viewed from the rear of the machine body. Because the opening 65 releases the waste straw from a high position in this way, the waste straw discharged through this opening 65 can be directed as far as possible toward the center position on the left and right of the machine body, and can be guided to an area where the crawler traveling device 2 does not pass.

[0050] The dust cover 60 is supported by connecting the front end of the outer plate 61 and the front end of the inner plate 62 to the side wall portions 24, 25 on both the left and right sides of the threshing device 4 at multiple points above and below with bolts. The outer plate 61 and the inner plate 62 are each oriented in a longitudinal direction along the fore-and-aft direction of the machine body.

[0051] The outer plate 61 and the inner plate 62 are both approximately trapezoidal in side view, with their upper edges inclined downward toward the rear, and their lower edges inclined upward toward the rear.

[0052] The lower end of the inner plate 62 is located higher than the lower end of the outer plate 61. That is, as shown in Fig. 7, the lower edge 62a of the inner plate 62 has a gentler angle of inclination of the rearward upward inclination than the lower edge 61a of the outer plate 61, and the rear end position of the lower edge 61a of the outer plate 61 and the rear end position of the lower edge 62a of the inner plate 62 are at the same position in a side view. Therefore, the front end position of the lower edge 62a of the inner plate 62 (which corresponds to the lower end of the inner plate) is located higher than the front end position of the lower edge 61a of the outer plate 61 (which corresponds to the lower end of the outer plate).

[0053] As shown in Figure 8, a soft sheet member 66 is provided below the inner plate 62, extending downward. The soft sheet member 66 is a sheet-like member made of a soft material such as rubber or cloth. By providing such a soft sheet member 66, it is possible to guide the discarded straw as far to the right of the machine body as possible, thereby discharging dust into an area where the crawler traveling device 2 does not pass, while also preventing the discarded straw from entering the fuel filler opening 52 of the fuel tank 50 located inside the machine body.

[0054] [Downflow guide] 3 and 4, a flow-down guide 70 is provided inside the dust discharge cover 60, extending from the outer plate 61 toward the inner plate 62 and positioned downward toward the right side of the machine body. This flow-down guide 70 is provided on the left side of the center position of the dust discharge cover 60 in the width direction of the machine body. In other words, the entire flow-down guide 70 is provided in a state where it is biased to the left side of the center position of the dust discharge cover 60 in the width direction of the machine body when viewed in the front-rear direction of the machine body.

[0055] The flow-down guide body 70 is provided in a state spanning the front and rear in an upper portion of the dust discharge cover 60 so as to substantially block the internal space of the dust discharge cover 60 in the front-rear direction in a side view of the machine body. The upper end position of the guide start end portion of the flow-down guide body 70 is located at a high position near the rotation axis between the rotation axis X1 of the threshing drum 32 and the lower end of the receiving net 36 in a rear view, and the lower end position of the guide end portion of the flow-down guide body 70 is located between the lower end of the rear wall portion 71 of the threshing section 29 and the upper end of the oscillating sorting device 38 in a rear view.

[0056] As shown in Figure 3, the receiving net 36 is not present at the location corresponding to the flow-down guide 70, but the rear end of the threshing drum 32 faces there. To explain further, the receiving net 36 is provided in a state where it is located inside the threshing section 29, which is divided into front and rear sections by a front wall 72 and a rear wall 71. The threshing drum 32 extends forward of the front wall 72 of the threshing section 29 and extends rearward of the rear wall 71 of the threshing section 29. The threshing drum 32 is equipped with a spiral blade 73 for carrying in crops on its front side, and is equipped with threshing teeth 35 similar to those in the threshing section 29 on its rear side of the rear wall 71. The rear wall 71 has a notch that is approximately U-shaped when viewed from the rear, which allows the threshing drum 32 to rotate and allows crops to pass through.

[0057] The straw that passes through the notch in the rear wall 71 of the threshing section 29 and is discharged rearward is discharged rearward and outward from the rear end of the threshing device 4. The straw that has leaked through the receiving net 36 and has not leaked through the oscillating sorting device 38 is also discharged rearward and outward from the threshing device 4.

[0058] 4 and 5, the flow-down guide 70 has a steeply inclined portion 74 with a large inclination angle with respect to the horizontal plane at the guide start end located on the upper side, and a gently inclined portion 75 with a small inclination angle with respect to the horizontal plane at the guide end end located on the lower side. The gently inclined portion 75 is located behind the shaking sorting device 38.

[0059] The upper end of the flow-down guide body 70 is fixed by a bolt to the left side wall 24 of the threshing device 4. This bolt connection point is located on the opposite side from the side that the discharged straw comes into contact with. A vertical intermediate position of the flow-down guide body 70 is fixed by a bolt to the rear wall 71 of the threshing section 29 via a bracket 76. The rear end of the flow-down guide body 70 is fixed by a bolt to the rear side plate 64 of the dust discharge cover 60 via a bracket 76 (see Figures 4 and 5).

[0060] As mentioned above, the receiving net 36 is not present in the area corresponding to the flow-down guide body 70, but the rear end of the threshing drum 32 faces there, so as the threshing drum 32 rotates, the straw is thrown by the threshing teeth 35 and discharged into the dust discharge cover 60. At this time, the discharged straw is guided by the flow-down guide body 70 to move toward the right side of the machine body and is discharged from below to the outside. Between the lower end of the rear wall 71 of the threshing section 29 and the upper end of the oscillating sorting device 38, sorting air is supplied from the winnower 41, so in addition to the throwing and guiding action that accompanies the rotation of the threshing drum 32, the sorting air also guides the straw further to the right.

[0061] [Another embodiment] (1) In the above embodiment, both the outer plate 61 and the inner plate 62 are in a longitudinal orientation along the longitudinal direction of the aircraft. However, instead of this configuration, as shown in FIG. 9, the inner plate 62 may be inclined so that it is positioned more inward (to the right) in the lateral direction of the aircraft as it approaches the rear of the aircraft in a plan view.

[0062] (2) In the above embodiment, the upper edge 65a of the opening 65 is configured to be located at a higher position than the chaff sieve 46 when viewed from the rear of the aircraft. However, instead of this configuration, the upper edge 65a of the opening 65 may be located at a lower position than the chaff sieve 46.

[0063] (3) In the above embodiment, the soft sheet member 66 extending downward is provided at the lower part of the inner plate 62, but such a soft sheet member 66 may not be provided.

[0064] (4) In the above embodiment, the fuel filler opening 52 of the fuel tank 50 is provided at a position adjacent to the inner plate 62 of the dust exhaust cover 60, but the fuel filler opening 52 may be provided at a different position.

[0065] (5) In the above embodiment, the crawler traveling device is provided as the traveling device. However, the crawler traveling device may be replaced with a wheeled traveling device. [Industrial Applicability]

[0066] The present invention can be applied to a combine harvester having a traveling body with a pair of left and right traveling devices and a threshing device that threshes harvested crops. [Explanation of symbols]

[0067] 2 Crawler running device (running device) 4. Threshing equipment 29 Threshing Department 38 Swinging sorting device (swinging sorting section) 46 Chaff Seeb 47 Glensieve 50 fuel tank 52 fuel filler 60 Dust exhaust cover 61 Outer plate (side plate) 62 Inner plate (side plate) 65 Open mouth 66 Soft sheet material 70 Flow guide

Claims

1. The machine is provided with a traveling machine body having a pair of left and right traveling devices, and a threshing device for threshing harvested crops, The threshing device is provided on the traveling machine body in a state where it is biased to either the left or right with respect to the center position in the width direction of the machine body, A dust discharge cover is provided at the rear of the threshing device to receive dust discharged from the threshing device and discharge it to the outside through a downward opening, The dust cover is provided with left and right side plates extending downward on both left and right sides of the opening, A combine harvester in which the lower end of the inner plate, which is located on the inner side in the left-right direction of the machine body, is located higher than the lower end of the outer plate, which is located on the outer side in the left-right direction of the machine body.

2. 2. The combine harvester according to claim 1, wherein the lower edges of the left and right side plates are inclined so that the rear ends are positioned higher.

3. The combine harvester according to claim 1, wherein the inner plate is provided in an inclined position such that the rearward side of the vehicle body is positioned more inward in the left-right direction of the vehicle body in a plan view.

4. The threshing device is provided with a threshing unit that threshes the harvested crops, and a swinging sorting unit that sorts the threshed material into grains and dust, The oscillating sorting unit is provided with a chaff sieve for coarsely sorting the threshed material, and a grain sieve provided below the chaff sieve for fine sorting, The combine harvester according to claim 1, wherein an upper edge of the opening is located at a position higher than the chaff sieve when viewed from the rear of the machine body.

5. The combine harvester according to claim 1, wherein the dust discharge cover is provided with a downward flow guide body that extends from the outer plate toward the inner plate and is inclined downward toward the inner side in the width direction of the machine body.

6. 6. The combine according to claim 5, wherein a soft sheet member is provided below the inner plate and extends downward.

7. The combine harvester according to claim 6, wherein a fuel tank filler port is provided at a position adjacent to the inner plate of the dust discharge cover on the inner side of the threshing device in the left-right direction of the machine body.

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