Combine Harvester

Abstract

The present invention provides a combine harvester in which foreign matter is not accumulated in the internal space of a cover. The combine harvester is provided with a threshing device (6), into which crops harvested by a harvesting part are put, and threshing is performed on the put crops. The threshing device (6) is provided with a threshing cylinder (12) that is driven by rotation to thresh the crops, and a threshing chamber that accommodates the threshing cylinder (12). The front and rear ends of the support shaft of the threshing cylinder (12) penetrate the front and rear walls of the threshing device (6), and a driving unit (43, 44) that inputs power to the threshing cylinder (12) is provided in a portion of the support shaft that protrudes outward from the device more than the wall. A cover (45) is provided that is mounted on the wall in a state that covers the driving unit (43, 44). An opening (60) is formed at the lower part of the cover (45), and the opening (60) allows foreign matter that enters the space between the wall and the cover (45) to fall.

Description

Technical Field

[0001] The invention relates to a combine harvester. Background Art

[0002] Regarding the first aspect, for example, in the threshing device disclosed in Patent Document 1, a threshing cylinder is housed in a threshing chamber, and the front end of the support shaft of the threshing cylinder ("threshing cylinder shaft" in the document) passes through the wall portion ("front wall" in the document). A portion of the support shaft that protrudes outward from the device more than the wall portion is provided with a driving portion ("input pulley" in the document), and the cover portion is mounted on the wall portion while covering the driving portion.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2019-110770

[0004] Problems to be solved by the invention

[0005] The cover disclosed in Patent Document 1 covers the entire drive unit, reducing the concern about foreign matter entering the internal space of the cover. However, it is conceivable that foreign matter may enter from the gap between the wall and the cover. When foreign matter enters the space between the wall and the cover from the gap, it is difficult for the foreign matter to be discharged from the internal space of the cover. Therefore, foreign matter may accumulate in the internal space of the cover for a long time, causing obstacles to the rotation drive of the drive unit.

[0006] Regarding the second aspect, for example, in the threshing device disclosed in Patent Document 1, a threshing drum is accommodated in a threshing chamber, and the front end of the support shaft of the threshing drum (referred to as "threshing drum shaft" in the document) passes through a wall portion (referred to as "front wall" in the document). A portion of the support shaft that protrudes outward from the device compared to the wall portion is provided with a driving wheel body (referred to as "input pulley" in the document) wound with an annular rotating body (referred to as "transmission belt" in the document), and the cover portion is mounted on the wall portion while covering the driving wheel body.

[0007] Problems to be solved by the invention

[0008] The cover disclosed in Patent Document 1 covers the entire driving wheel body, alleviating the concern that foreign matter may enter the internal space of the cover. However, the following situation can be imagined: it is impossible to completely prevent dust and the like from entering from the gap between the wall and the cover, and the dust and the like that enter gradually accumulate at the bottom of the cover. When the driving wheel body rotates, in the space around the driving wheel body, air flow will be generated to some extent along the rotation direction of the driving wheel body, so that dust and the like will float while flowing from the upstream side of the rotation direction of the driving wheel body to the downstream side of the rotation direction. The farther away from the driving wheel body, the more the air flow is attenuated, so the suspended dust and the like are easily accumulated in the bottom of the cover, which is far away from the driving wheel body. Moreover, if dust and the like are gradually accumulated from the part away from the driving wheel body, and dust and the like are accumulated in the space near the lower part of the driving wheel body, it is possible that the rotation drive of the driving wheel body will be hindered due to the foreign matter being drawn between the driving wheel body and the annular rotating body. Summary of the invention

[0009] A first aspect of the present invention provides a combine harvester in which foreign matter is not accumulated in the internal space of a cover.

[0010] Solutions to Solve Problems

[0011] In the combine harvester of the first aspect of the present invention, it is characterized in that it comprises: a harvesting section, which harvests crops in the field and transports them toward the rear of the machine body; and a threshing device, into which crops harvested by the harvesting section are put and threshing the put crops is performed, the threshing device comprises a threshing cylinder that is rotationally driven to thresh the crops and a threshing chamber that accommodates the threshing cylinder, the front and rear ends of the support shaft of the threshing cylinder penetrate the front and rear walls of the threshing device, and a driving section that inputs power to the threshing cylinder is provided at a portion of the support shaft that protrudes to the outside of the device more than the wall, the combine harvester comprises a cover portion installed on the wall portion in a state covering the driving section, an opening portion is formed at the lower portion of the cover portion, and the opening portion allows foreign objects that enter the space between the wall portion and the cover portion to fall.

[0012] According to the present invention, an opening is formed at the lower part of the cover. Therefore, even if foreign matter enters the internal space of the cover, the foreign matter will quickly fall downward from the opening. Thus, the concern that foreign matter will accumulate in the internal space of the cover can be eliminated. As a result, a combine harvester can be realized in which foreign matter is not accumulated in the internal space of the cover.

[0013] In the present invention, it is preferable that the opening is formed in a central region in a width direction of the threshing device in a lower portion of the cover.

[0014] According to this structure, since the opening is formed in the central area of ​​the lower part of the cover, foreign matter in the left and right areas of the lower part of the cover is actively dropped from the opening in the central area, compared with a structure in which the opening is formed at one of the left and right ends of the lower part of the cover. Therefore, foreign matter is less likely to accumulate in the internal space of the cover.

[0015] In the present invention, it is preferable that the opening is formed in a portion of the lower portion of the cover portion that is located below a range where the driving unit exists.

[0016] According to this structure, since the opening is located below the existence range of the driving unit, foreign matter in the area below the driving unit actively falls from the opening, thereby further reducing the concern that foreign matter accumulated in the internal space of the cover will hinder the rotation drive of the driving unit.

[0017] In the present invention, preferably, the driving portion is composed of a transmission belt and a rotating body around which the belt is wound, and the opening is formed at a portion of the lower portion of the cover portion close to the belt.

[0018] If there is foreign matter in the driving part of the belt, there is a concern that the foreign matter will be caught between the rotating body and the belt, so it is not preferred that the foreign matter accumulates in the part close to the belt. According to this structure, since the opening is formed in the part close to the belt, the concern of causing an obstruction to the rotational drive of the driving part can be further reduced.

[0019] In the present invention, it is preferable that the cover portion is formed in a downwardly tapered shape so that the width thereof becomes narrower toward the lower side, and the opening portion is configured to include a lower end portion of the cover portion.

[0020] According to this structure, since the cover is formed into a downwardly narrowed shape, even if foreign matter enters the internal space of the cover, the foreign matter is guided to the lower end of the cover along the portion of the downwardly narrowed shape. Furthermore, since the opening is formed to include the lower end of the cover, the foreign matter actively falls downward from the lower end region of the cover. As a result, foreign matter is less likely to accumulate in the internal space of the cover.

[0021] In the present invention, it is preferred that the combine harvester includes a supply chain for transporting crops from the harvesting section while the crop tips are dropped into the threshing chamber, the support shaft passes through a front wall portion of the threshing device, and the driving section is arranged in front of the front wall portion, and an entrance portion for the crops transported by the supply chain to enter the threshing chamber is formed in a lower area of ​​the front wall portion covered by the cover portion, and a limiting component is provided at the opening portion, and the limiting component limits the entry of foreign matter into the space from the opening portion.

[0022] If the structure is such that an entrance to the threshing chamber is formed in the lower area of ​​the cover, the crops transported by the supply chain may enter the inner space of the cover from the opening. In this structure, since the restriction member is provided at the opening, foreign matter is less likely to accumulate in the inner space of the cover, and the crops transported by the supply chain are less likely to enter the inner space of the cover from the opening.

[0023] In the present invention, preferably, the opening is partitioned into a plurality of openings by the restriction member.

[0024] According to this structure, since the restriction member divides the opening into a plurality of openings, a structure in which the openings are reduced one by one can be realized. Thus, it is difficult for crops to enter the inner space of the cover through the opening.

[0025] In the present invention, preferably, the combine harvester comprises: a sheet member, which is flexible and hangs down from the lower part of the cover to cover the entrance from the front; and a pressing member, which presses and fixes the upper end part of the sheet member, and the limiting member comprises a main body located at the opening and a base supported at the lower part of the cover, and the base and the pressing member are fastened and fixed to the lower part of the cover together by fasteners.

[0026] According to this structure, since the base and the pressing member are fastened and fixed to the lower part of the cover by the fastener, the limiting member is firmly supported by the lower part of the cover. In addition, since the pressing member is a structure that presses and fixes the upper end of the sheet member, the lower part of the cover serves as a supporting member for the limiting member and a supporting member for the sheet member. Thus, the supporting structure of the limiting member and the sheet member can be simplified.

[0027] A second aspect of the present invention provides a combine harvester in which dust and the like are less likely to accumulate around a driving wheel body around which an endless rotating body is wound.

[0028] Solutions to Solve Problems

[0029] In the combine harvester according to the second aspect of the present invention, it is characterized in that it comprises: a harvesting section that harvests crops in a field and transports them toward the rear of a machine body; and a threshing device, the threshing device having a threshing drum that is driven to rotate and a threshing chamber that accommodates the threshing drum, the threshing device is fed with crops harvested by the harvesting section, and the fed crops are threshed by the threshing drum, the front and rear ends of the support shaft of the threshing drum penetrate the front and rear walls of the threshing device, and a driving wheel body around which an annular rotating body is wound is provided in a portion of the support shaft that protrudes outward from the device more than the wall, and the annular rotating body transmits power from a driving source, the combine harvester comprises a cover portion that is mounted on the wall portion and covers the driving wheel body, the cover portion comprises a bottom portion that covers the driving wheel body from below, and in the area covered by the cover portion, a wall component is provided in a position that is located on the upstream side in the direction in which the lower portion rotates relative to the space between the lower portion of the driving wheel body and the bottom, so as to face the space.

[0030] According to the present invention, the wall member is arranged in a state facing the space on the upstream side of the lower part of the driving wheel body in the rotation direction of the space between the lower part and the bottom of the driving wheel body. When the driving wheel body rotates, in the space around the driving wheel body, air flow is generated to some extent along the rotation direction of the driving wheel body. Therefore, when foreign matter flows from the upstream side of the driving wheel body in the rotation direction to the downstream side in the rotation direction, the foreign matter is guided to the space on the side opposite to the side where the driving wheel body is located relative to the wall member. Thereafter, the foreign matter is separated from the driving wheel body by the wall member, and concerns about foreign matter entering the space between the lower part and the bottom of the driving wheel body can be reduced. As a result, concerns about foreign matter accumulating in the space near the lower part of the driving wheel body can be reduced, and a combine harvester can be implemented in which foreign matter is difficult to accumulate around the driving wheel body wound with an annular rotating body.

[0031] In the present invention, it is preferable that an upper portion of the wall member be curved so as to follow an outer peripheral shape of an upper portion of the driving wheel body.

[0032] In this structure, the upper part of the wall part follows the outer peripheral shape of the upper part of the driving wheel body, so that the wall part can be as close to the driving wheel body as possible. As a result, the space between the wall part and the driving wheel body becomes narrower, and foreign matter is easily guided to the space on the side opposite to the side where the wall part and the driving wheel body are located.

[0033] In the present invention, preferably, the upper end portion of the wall member extends to a position upstream of an upper apex of the driving wheel body in a direction in which the upper portion of the driving wheel body rotates.

[0034] According to this structure, the wall member is configured to cover the upper part of the driving wheel body as much as possible. This can reduce the worry that foreign matter falls on the driving wheel body, and can further reduce the worry that foreign matter enters the space between the lower part and the bottom of the driving wheel body.

[0035] In the present invention, it is preferable that the upper end portion of the wall member is fixed at a position on the downstream side above the apex of the driving wheel body in the direction in which the upper portion of the driving wheel body rotates.

[0036] According to this structure, the structure of the wall member is compact and simple.

[0037] In the present invention, it is preferred that the wall part is arranged in a state facing the winding area in the driving wheel body on which the annular rotating body is wound, and the upper end of the wall part extends to a position closer to the upstream side than the upstream end of the winding area in the direction of rotation of the upper part of the driving wheel body.

[0038] According to this configuration, since the upper portion of the upstream end portion of the winding region is covered by the wall member, the concern that foreign matter may be caught between the driving wheel body and the endless rotating body can be reduced.

[0039] In the present invention, it is preferred that the wall part is arranged in a state facing the winding area in the driving wheel body where the annular rotating body is wound, and the upper end of the wall part is fixed at a position closer to the downstream side than the upstream end of the winding area in the direction of rotation of the upper part of the driving wheel body.

[0040] According to this structure, the structure of the wall member is compact and simple.

[0041] In the present invention, preferably, the wall member stands upright from the bottom.

[0042] In this structure, the wall member rises from the bottom. Therefore, even if foreign matter accumulates in the bottom portion on the side opposite to the side where the wall member and the drive wheel body are located, the concern that foreign matter may enter the space between the lower part of the drive wheel body and the bottom can be reduced compared to a structure in which there is a gap between the wall member and the bottom.

[0043] In the present invention, preferably, an opening for allowing foreign matter entering the space between the wall portion and the cover portion to fall is formed in a portion of the bottom portion on the side opposite to the wall member where the driving wheel body is located.

[0044] According to this structure, foreign matter will not accumulate on the part of the bottom opposite to the side where the wall part and the driving wheel body are located. Therefore, it is possible to prevent foreign matter accumulated on the part of the bottom opposite to the side where the wall part and the driving wheel body are located from passing over the wall part and falling to the side where the driving wheel body is located.

[0045] In the present invention, it is preferable that the opening portion is provided with a restriction member for restricting foreign matter from entering the space from the opening portion, and the opening portion is partitioned into a plurality of openings by the restriction member.

[0046] According to this structure, since the restricting member is provided at the opening, it is more difficult for foreign matter to accumulate in the internal space of the cover. In addition, according to this structure, since the restricting member divides the opening into a plurality of openings, it is possible to realize a structure that reduces the number of openings at the opening. Thus, it is difficult for foreign matter to enter the internal space of the cover from the opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] First embodiment

[0048] Figure 1 It is an overall side view of the combine harvester.

[0049] Figure 2 It is a figure which shows schematically the threshing device.

[0050] Figure 3 It is a longitudinal sectional view showing the swing sorting device.

[0051] Figure 4 This is a graph showing the width of the interval between the sieve plates at each position of the sieve plates.

[0052] Figure 5 This is a front view showing a rotating body, a cover part, and an opening part provided on the front wall part of the threshing device.

[0053] Figure 6 It is a rotating body, a cover part, an opening part provided on the front wall part of the threshing device. Figure 5 VI-VI sectional view.

[0054] Figure 7 It is a rotating body, a cover part, an opening part provided on the front wall part of the threshing device. Figure 5 VII-VII sectional view.

[0055] Figure 8 It is a front view showing a cover part and an opening part according to another embodiment.

[0056] Second embodiment

[0057] Fig. 9 It is an overall side view of the combine harvester.

[0058] Fig.10 It is a front view which shows the rotating body, the cover part, and the wall member provided in the front wall part of a threshing device.

[0059] Fig.11This is a front view showing a rotating body and a wall member provided on the front wall portion of the threshing device.

[0060] Fig.12 The invention refers to a rotating body, a cover, a wall member, an opening portion, etc. provided on the front wall of the threshing device. Figure 2 IV-IV cross-sectional view.

[0061] Fig.13 It represents the rotating body and wall parts. Fig.10 VV cross-sectional view of.

[0062] Fig.14 It is a bottom view which shows the rotating body, the cover part, the wall member, and the opening part which are provided in the front wall part of a threshing device.

[0063] Fig.15 This is a front view showing a rotating body, a cover part, and a wall member provided in the front wall part of the threshing device as another embodiment.

[0064] Fig.16 This is a front view showing a rotating body, a cover part, and a wall member provided in the front wall part of the threshing device as another embodiment.

[0065] Fig.17 This is a front view showing a rotating body, a cover part, and a wall member provided in the front wall part of the threshing device as another embodiment.

[0066] Description of Reference Numerals

[0067] First embodiment

[0068] 4: Harvest Department

[0069] 6: Threshing device

[0070] 7: Supply Chain

[0071] 12: Threshing cylinder

[0072] 13: Threshing room

[0073] 19: Support shaft

[0074] 41: Front wall part (wall part)

[0075] 42: Entrance Department

[0076] 43: Rotating body (driving unit)

[0077] 44: Belt (driving unit)

[0078] 45: Hood

[0079] 45o: Opening

[0080] 46: Restricted parts

[0081] 46A: Base

[0082] 46B: Main body

[0083] 47: Pressing parts

[0084] 47B: Welding bolts (fasteners)

[0085] 49: Sheet parts

[0086] Nu: nut (fastener)

[0087] Second embodiment

[0088] 4: Harvest Department

[0089] 6: Threshing device

[0090] 12: Threshing cylinder

[0091] 13: Threshing room

[0092] 41: Front wall part (wall part)

[0093] 43: Rotating body (driving wheel body)

[0094] 43R: Winding area

[0095] 43s: Starting end (upstream end of the winding area)

[0096] 43f: terminal portion (downstream end portion of the winding region)

[0097] 43t: The top of the driving wheel

[0098] 44: Belt (ring-shaped rotating body)

[0099] 45: hood body (hood part)

[0100] 48: Bottom (hood)

[0101] 60: Opening

[0102] 60a: Opening

[0103] 61: Restricted components

[0104] 62: Wall Parts

[0105] S1: The space between the lower part of the driving wheel body and the bottom

[0106] Y1: Rotation axis DETAILED DESCRIPTION

[0107] Regarding the first aspect of the present invention, a first embodiment as an example of the present invention will be described below based on a combine harvester. It should be noted that in the following description, the traveling body 1 of the combine harvester is referred to as Figure 1 as well as Figure 2 The direction of the arrow "F" shown in the figure is set to "front of the machine body", and the direction of the arrow "B" is set to "rear of the machine body". Figure 1 as well as Figure 2 Set the paper front direction to "machine left" and the paper back direction to "machine right". Figure 5 The direction of the arrow "L" shown is set to "the left side of the machine body", and the direction of the arrow "R" is set to "the right side of the machine body".

[0108] [About the Combine Harvester as a Whole]

[0109] like Figure 1 As shown, the traveling body 1 of the combine harvester has a frame 2, and the frame 2 is composed of a plurality of steel materials such as square pipes. A pair of left and right crawler-type traveling devices 3 are equipped at the lower part of the frame 2. A driving part 5 is provided at the right lateral side part of the front part of the traveling body 1. The riding space of the driving part 5 is covered by the cab. An engine E is arranged below the driving part 5. At the front part of the traveling body 1, a harvesting part 4 is arranged so as to be able to be raised and lowered. The harvesting part 4 harvests while supporting a plurality of upright stalks (crops) of rice and wheat planted in front of the traveling body 1, and transports the harvested stalks toward the rear of the body. At the rear part of the frame 2, a threshing device 6 and a grain storage box 8 are supported in a horizontally arranged state. The threshing device 6 is arranged at the rear of the harvesting part 4, and the grain storage box 8 is arranged at the rear of the driving part 5. A supply chain 7 is provided on the left side of the threshing device 6, and the supply chain 7 clamps and conveys the harvested grain stalks harvested by the harvesting section 4 to the rear. In the threshing device 6, the harvested grain stalks put in are threshed, and the grains and dust obtained by the threshing process are sorted. The grain storage box 8 stores the grains conveyed from the threshing device 6. A grain discharge device 9 for taking out the grains from the grain storage box 8 is connected to the rear of the grain storage box 8.

[0110] 〔Threshing device〕

[0111] Figure 2The threshing device 6 is shown. The threshing device 6 is provided with a threshing section 10 and a sorting section 11. The threshing section 10 threshes the crops, and the sorting section 11 sorts the processed materials after the threshing process while conveying them to the rear. The threshing section 10 is provided with a threshing drum 12, a receiving net 14, a separating drum 15 and a dust exhaust fan 16. A threshing chamber 13 is formed in the threshing section 10, and the threshing chamber 13 accommodates the threshing drum 12. The threshing drum 12 is arranged in the threshing chamber 13 in a state extending in the front-rear direction of the machine body, and the threshing drum 12 can rotate around a rotating shaft core Y1 extending in the front-rear direction of the machine body.

[0112] The threshing drum 12 is provided with a threshing drum 17, a plurality of threshing teeth 18, and a support shaft 19. The long side direction of the support shaft 19 is along the rotation axis Y1, and the threshing drum 17 rotates integrally with the support shaft 19. The threshing teeth 18 are mounted on the circumferential surface of the threshing drum 17. The front end portion of the support shaft 19 of the threshing drum 12 penetrates the front wall portion 41 of the threshing device 6. A rotating body 43 for inputting power to the threshing drum 12 is provided in a portion of the support shaft 19 that protrudes to the outside of the threshing device 6 than the front wall portion 41. The rotating body 43 is a pulley.

[0113] A transmission belt 44 is wound around the rotating body 43 and an output pulley (not shown) and the like (see FIG. Figures 5 to 8 ), the power from the engine E is input to the rotating body 43 via the output pulley. The rotating body 43 and the belt 44 are the "driving unit" in the present invention. That is, the "driving unit" in the present invention is constituted by the belt 44 for transmission and the rotating body 43 around which the belt 44 is wound.

[0114] A threshing port for the harvested grain stalks to pass through is formed on the left side of the threshing device 6. An entrance 42 (see FIG. 1 ) to the threshing chamber 13 is formed in the lower region of the portion covered by the cover 45 in the front wall 41 of the threshing device 6. Figure 5 as well as Figure 6 The harvested grain stalks harvested by the harvesting section 4 and conveyed rearward by the supply chain 7 are put into the threshing chamber 13 from the entrance 42. The supply chain 7 conveys the harvested grain stalks from the harvesting section 4 while putting the ear tips of the harvested grain stalks into the threshing chamber 13.

[0115] In conjunction with the rotational drive of the rotating body 43, the threshing drum 12 is driven to rotate and thresh the harvested grain stalks. The harvested grain stalks clamped and transported to the rear by the supply chain 7 are threshed in the threshing chamber 13 by the beating and combing action based on the rotation of the threshing drum 12. A receiving net 14 is provided below the threshing drum 12. A separation drum 15 is provided behind the threshing drum 12. The separation drum 15 is a diffusion drum that disperses the sorting objects and promotes the flow of the single-grained grains contained therein. A dust exhaust fan 16 that discharges dust to the outside is provided behind the separation drum 15.

[0116] A cover 45 is mounted on the front wall 41 of the threshing device 6 in a state of covering the rotating body 43 and the belt 44. In addition, an elastically deformable sheet member 49 is provided to cover the inlet 42. The sheet member 49 is, for example, a flexible rubber member, and is fixed to the lower part of the cover 45 by bolts. The sheet member 49 hangs down from the lower part of the cover 45 and covers the inlet 42 from the front. The upper end of the sheet member 49 is pressed by the pressing member 47 and fixed to the lower part of the cover 45.

[0117] The sorting section 11 is arranged below the threshing section 10, that is, below the threshing device 6. The sorting section 11 is equipped with: a swing sorting device 21, a main air separator 22A, a first auxiliary air separator 22B, a second auxiliary air separator 22C, a primary processed material recovery section 23, a secondary processed material recovery section 24, and an inclined portion 37. The swing sorting device 21 has a screen box 21A formed in a rectangular frame shape when viewed from above, and the sorting object is swing-sorted by the swing of the screen box 21A. The main air separator 22A blows sorting air to the lower sorting area (fine sorting area) in the swing sorting device 21. The first auxiliary air separator 22B blows sorting air to the upper sorting area (rough sorting area) in the swing sorting device 21. The second auxiliary air separator 22C blows sorting air to the rear sorting area in the swing sorting device 21.

[0118] The primary processed material recovery section 23 and the secondary processed material recovery section 24 are arranged below the screen box 21A. The primary processed material recovery section 23 recovers the processed material leaking from the screen box 21A as the grains of the primary processed material (single-grained grains, etc.). The secondary processed material recovery section 24 is arranged at the rear of the primary processed material recovery section 23, and recovers the processed material leaking from the rear of the screen box 21A as the grains of the secondary processed material (grains with stalks, etc.). The primary processed material recovery section 23 is provided with a primary screw device 25, and the primary screw device 25 conveys the grains of the primary processed material to the right. The right end of the primary screw device 25 is linked to a longitudinal grain feeding device 26, and the longitudinal grain feeding device 26 conveys the grains of the primary processed material longitudinally to the grain storage box 8. The secondary processed material recovery section 24 is provided with a secondary screw device 27, and the secondary screw device 27 conveys the grains of the secondary processed material to the right. A secondary reduction device 28 is interlockingly connected to the right end of the secondary screw device 27, and the secondary reduction device 28 reduces the grains of the secondary processed product to the screen box 21A.

[0119] The swing sorting device 21 is provided with a first vibration plate 32, a second vibration plate 33, an upper screen 34, a lower screen 35, and a draft remover 36. The first vibration plate 32, the second vibration plate 33, the upper screen 34, the lower screen 35, and the draft remover 36 are supported by the screen box 21A, respectively. An eccentric cam type driving mechanism 31 is provided at the rear of the screen box 21A, and when the driving mechanism 31 is driven, the screen box 21A swings as a whole.

[0120] The first vibration plate 32 is provided at the conveying start end of the screen box 21A, and performs gravity sorting while conveying the processed material backward. The second vibration plate 33 is provided behind the first vibration plate 32, and performs gravity sorting while conveying the processed material leaking from the rear of the receiving net 14 backward.

[0121] The second vibration plate 33 is disposed at a position closer to the secondary reduction device 28 than the first vibration plate 32, and most of the grains of the secondary processed product discharged from the secondary reduction device 28 are received by the second vibration plate 33 and subjected to specific gravity sorting on the second vibration plate 33. The upper screen 34 is disposed below the first vibration plate 32 and the second vibration plate 33. The lower screen 35 is disposed below the upper screen 34.

[0122] A screen line 33a is installed at the rear of the second vibration plate 33. The screen lines 33a extend backward from the rear of the second vibration plate 33 and are arranged at intervals in the left-right direction of the machine body. The rear of the upper screen 34 and the draft remover 36 are arranged below the screen line 33a. The screen line 33a disperses the processed material from the second vibration plate 33 while allowing the processed material to leak downward.

[0123] like Figure 3 As shown, welding bolts 21B are fixed to the lower edge of the upper screen 34 in the screen box 21A, and the lower screen 35 is engaged with the welding bolts 21B from below and fixed by nuts 21N. That is, the lower screen 35 is fastened to the lower edge of the screen box 21A.

[0124] like Figure 2 as well as Figure 3 As shown, the inclined surface 37 is provided below the screen box 21A and is connected to a portion of the screen box 21A that is closer to the rear side than the rear end of the lower screen 35 in the front-to-back direction. The inclined surface 37 is formed in a shape inclined toward the primary processed material recovery portion 23. In other words, the inclined surface 37 extends from a position corresponding to the rear end of the upper screen 34 toward the primary processed material recovery portion 23 in the front-to-back direction in a state of being lower at the front and higher at the back. The extended end of the inclined surface 37 is located in the area of ​​the primary processed material recovery portion 23. The processed material leaking from the upper screen 34 and leaking downward from the lower screen 35 falls toward the primary processed material recovery portion 23 or the inclined surface 37. The processed material falling to the primary processed material recovery portion 23 or the inclined surface 37 is recovered by the primary processed material recovery portion 23 as grains of the primary processed material.

[0125] The wind walker 36 is disposed behind the upper screen 34. Of the processed materials conveyed to the wind walker 36, processed materials leaking from the wind walker 36 are recovered by the secondary processed material recovery unit 24 as grains of secondary processed materials.

[0126] 〔Structure of upper screen〕

[0127] like Figure 3 As shown, the upper screen 34 is configured to be able to adjust the opening. The upper screen 34 is equipped with a plurality of sieve plates 34A, and the sieve plates 34A extend to the left and right of the screen box 21A respectively. The plurality of sieve plates 34A are arranged at a predetermined interval in the front-to-back direction (transport direction), and the processed material can leak from the gaps d1 and d2 between the sieve plates 34A. The long side direction of each sieve plate 34A is along the horizontal direction of the machine body. The sieve plates 34A are respectively configured to be able to rotate around the horizontal axis core of the machine body, and are connected to each other by connecting rods 34B (connecting rod mechanisms). Therefore, the plurality of sieve plates 34A rotate synchronously as a whole. It is configured to be able to change the opening of the gaps d1 and d2 between the sieve plates 34A through the rotating mechanism of the sieve plates 34A. The sieve plates 34A are respectively tilted in a manner to become the same rotation angle. Each sieve plate 34A is always parallel regardless of the rotation angle.

[0128] In the present embodiment, the gaps d1 and d2 between the sieve plates 34A are the separation distances between the lower surface portion (rear surface portion) of the sieve plate 34A on the front side and the upper surface portion (rear surface portion) of the sieve plate 34A on the rear side in the front and rear adjacent sieve plates 34A. Although each sieve plate 34A has a wall thickness, the gaps d1 and d2 between the sieve plates 34A are the separation distances excluding the thick wall portions of each sieve plate 34A.

[0129] In this embodiment, the gap between the sieve plates 34A is set to two stages before and after. Figure 3 as well as Figure 4 As shown, the gap d1 is set in the front part L1, and the gap d2 is set in the rear part L2. It should be noted that Figure 3 as well as Figure 4 The gaps d1 and d2 shown are gaps at any rotation angle of the sieve plate 34A. Since the gaps d1 and d2 are proportional to the rotation angle of the sieve plate 34A, the ratio (d1 / d2) is always constant regardless of the rotation angle of each sieve plate 34A.

[0130] The sieve plates 34A are arranged in such a manner that the intervals between the sieve plates 34A located in the rear portion L2 of the upper sieve 34 are wider than the intervals between the sieve plates 34A located in the front portion L1. The gap d2 between the sieve plates 34A located in the rear portion L2 is configured to be wider than the gap d1 between the sieve plates 34A located in the front portion L1. In the present embodiment, the sieve plates 34A located in the front portion L1 are referred to as "first sieve plates". In addition, in the present embodiment, the sieve plates 34A located in the rear portion L2 are referred to as "second sieve plates". The sieve plates 34A located in the rear portion L2 are respectively disposed in the upper sieve 34 at positions on the rear side of the area directly above the primary processed material recovery section 23. In addition, in Figure 3In the figure, the position where the rear end of the receiving net 14 is located in the front-rear direction is indicated by 14F, and the sieve plates 34A located in the rear portion L2 are respectively located at the rear side of the position indicated by 14F.

[0131] A second vibration plate 33 is disposed above the upper screen 34. The second vibration plate 33 overlaps with the boundary area between the front portion L1 and the rear portion L2 in the front-to-rear direction (transport direction). The plurality of sieve plates 34A located in the rear portion L2 overlap with the second vibration plate 33 in the transport direction. The area where the second vibration plate 33 is located in the transport direction is Figure 3 The area L3 where the second vibration plate 33 is located overlaps the area of ​​the rear portion L2 where the second sieve plate is located in the conveying direction. In addition, there is an area of ​​the rear portion L2 where the second sieve plate is located just below the sieve line 33a.

[0132] [Regarding the cover portion of the covering tape]

[0133] based on Figure 2 As described above, the support shaft 19 protrudes forward from the front wall portion 41 of the threshing device 6, and the rotating body 43 is provided at the front end portion of the support shaft 19. In addition, the cover portion 45 covering the rotating body 43 and the belt 44 is installed on the front wall portion 41 of the threshing device 6.

[0134] like Figure 5 as well as Figure 6 As shown, two stays 51, 51 for supporting the upper part of the cover 45 protrude from the front wall 41 toward the front side of the machine body, and a support frame 52 is horizontally arranged across the two stays 51, 51. In addition, an engaging portion 53 engaged with the buckle 45B of the cover 45 is provided in a state of protruding from the right end of the front wall 41 toward the front side of the machine body.

[0135] The cover portion 45 is provided with a pair of cover hooks 45H, 45H for engaging with the support frame 52. A pair of flat-plate stays 45S, 45S are welded and fixed to left and right portions of the upper end portion of the cover portion 45. The cover hooks 45H, 45H are welded and fixed to the pair of stays 45S, 45S, respectively.

[0136] A pair of engagement holes is formed at both left and right ends of the support frame 52 , and the pair of engagement holes faces the pair of cover hooks 45H, 45H. The pair of cover hooks 45H, 45H are hooked on the pair of engagement holes, whereby the pair of cover hooks 45H, 45H are engaged with the support frame 52 .

[0137] The operator releases the engagement between the buckle 45B and the engagement portion 53, swings the cover 45 toward the front side of the machine body, and then slides the cover 45 upward, thereby disengaging the cover hook 45H from the support frame 52. In this way, the operator removes the cover 45 from the machine body. In addition, the operator slides the cover 45 downward relative to the support frame 52 and hooks the cover hooks 45H, 45H to a pair of engagement holes of the support frame 52. Thereafter, the operator swings the cover 45 toward the rear side of the machine body, and engages the buckle 45B with the engagement portion 53. In this way, the operator can attach the cover 45 to the machine body.

[0138] The front end of the cover 45 is formed in a plane extending up and down, and this part is called the vertical surface 45a of the cover 45. A left inclined surface 45c and a right inclined surface 45d are formed at the lower part of the cover 45. The left inclined surface 45c and the right inclined surface 45d are inclined in a manner that the lower side is located at the rear side of the body when viewed from the side of the body. The left inclined surface 45c is inclined in a manner that the lower side is located at the rear side of the body when viewed from the front and rear direction of the body. Figure 5 The right inclined surface 45d is formed in a left rising shape in such a way that the right inclined surface 45d is located on the upper side. Figure 5 The left inclined surface 45c is inclined upward compared with the right inclined surface 45d. In this way, the cover part 45 is formed into a downwardly narrowed shape in a manner that the width becomes narrower as it approaches the lower side in the lateral direction of the machine body.

[0139] A plate-like lower wall 48 is provided across the left and right inclined surfaces 45c and 45d and the front wall 41. The lower wall 48 is formed in a V-shape along the inclination of the left and right inclined surfaces 45c and 45d when viewed in the front-rear direction.

[0140] [About the opening of the cover]

[0141] like Figures 5 to 7 As shown in FIG. 1 , an opening 60 is formed at the lower portion of the cover portion 45 formed in a downwardly narrowed shape. The area indicated by L11 from the lower end to the left side of the machine body in the left inclined surface portion 45c and the area indicated by L12 from the lower end to the right side of the machine body in the right inclined surface portion 45d are recessed toward the upper front of the machine body, and the recessed portion is the opening 60. In addition, the area indicated by L11 and L12 in the lower wall portion 48, that is, the area below the rotating body 43, is recessed toward the rear of the machine body, and the recessed portion is the opening 60. That is, the opening 60 is formed by the recessed portions of the left inclined surface portion 45c and the right inclined surface portion 45d and the recessed portion of the lower wall portion 48. The opening 60 allows foreign matter that has entered the space between the front wall portion 41 and the cover portion 45 to fall.

[0142] As described above, the cover 45 is formed in a downwardly narrowed shape in a manner that the width becomes narrower toward the lower side, and the opening 60 is configured to include the lower end of the cover 45. The opening 60 is formed in the central area in the width direction of the threshing device 6 in the lower part of the cover 45. In addition, the opening 60 is formed in a portion of the lower part of the cover 45 located below the existence range of the rotating body 43.

[0143] like Figure 5 As shown in FIG. 1 , when viewed in the front-rear direction, the opening 60 overlaps with the lower portion of the rotating body 43. In addition, the opening 60 overlaps with the rotating body 43 in the lateral direction of the machine body with a width greater than half of the left-right width of the rotating body 43. The opening 60 is formed in a portion of the lower portion of the cover 45 close to the belt 44. By forming the opening 60 below the rotating body 43, dust and the like are not accumulated in the area below the rotating body 43.

[0144] like Figures 5 to 7 As shown, the opening portion 60 is provided with a lattice-shaped limiting member 46. The limiting member 46 limits foreign matter from entering the space between the front wall portion 41 and the cover portion 45 from the opening portion 60. A pressing member 47 is fixed by bolts directly above the opening portion 60. The pressing member 47 is formed in a V-shape along the inclined shape of the left inclined surface portion 45c and the right inclined surface portion 45d when viewed in the front-back direction. A welding bolt 47B is installed on the pressing member 47. In addition, a plurality of insertion holes are opened in the lower edge portion of the vertical surface portion 45a, and the plurality of insertion holes in the lower edge portion of the vertical surface portion 45a are opened at positions corresponding to the welding bolts 47B.

[0145] like Figure 7 As shown, the limiting component 46 includes a base 46A and a main body 46B. The base 46A is formed into a V-shape along the inclined shape of the left inclined surface 45c and the right inclined surface 45d when viewed in the front-to-back direction, similarly to the pressing component 47. The base 46A is supported on the lower edge of the vertical surface 45a, and the main body 46B is located at the opening 60. The base 46A and the main body 46B are welded and fixed to each other, and the main body 46B extends downward from the base 46A. In addition, the main body 46B is formed into an L-shape when viewed from the side of the body, and the extended end of the main body 46B extends to the rear of the body. The extended end of the main body 46B abuts against the lower wall 48, and in this state, the extended end of the main body 46B is located at the lower side relative to the lower wall 48.

[0146] The sheet member 49, the base 46A, and the pressing member 47 are fastened and fixed to the lower portion of the cover 45 by means of welding bolts 47B and nuts Nu. The welding bolts 47B and nuts Nu are "fasteners" in the present invention.

[0147] Similar to the plurality of insertion holes provided at the lower edge of the vertical surface 45a, a plurality of insertion holes are provided at the upper edge of the sheet member 49. The plurality of insertion holes of the sheet member 49 are provided at positions corresponding to the welding bolts 47B and the plurality of insertion holes provided at the lower edge of the vertical surface 45a. In addition, a plurality of insertion holes are provided at the base 46A. The insertion holes of the base 46A are provided at positions corresponding to the welding bolts 47B and the plurality of insertion holes provided at the lower edge of the vertical surface 45a.

[0148] In a state where the plurality of insertion holes of the sheet member 49, the plurality of insertion holes of the lower edge portion of the vertical surface portion 45a, and the insertion holes of the base portion 46A overlap front and back, the welding bolt 47B of the pressing member 47 is inserted through these insertion holes. Thereafter, the welding bolt 47B is tightened with the nut Nu. In this state, the base portion 46A of the restricting member 46 is clamped by the lower portion of the vertical surface portion 45a and the nut Nu tightened to the welding bolt 47B of the pressing member 47. In addition, the sheet member 49 is clamped by the pressing member 47 and the lower portion of the vertical surface portion 45a. The sheet member 49 is located in front of the restricting member 46.

[0149] When the base 46A is fixedly secured to the vertical surface 45a, the main body 46B covers the entire surface of the opening 60. The main body 46B is configured in a lattice shape, so the opening 60 is divided into a plurality of openings 60a by the main body 46B of the restricting member 46. As a result, each of the openings 60a formed in the main body 46B in the opening 60 becomes smaller, and it is difficult for crops to enter the internal space of the cover 45 through the opening 60.

[0150] [Other implementation methods]

[0151] The present invention is not limited to the configurations described in the above-described embodiments, and other representative embodiments of the present invention will be described below.

[0152] (1) In the above embodiment, the lower portion of the cover portion 45 is formed into a downwardly narrowed shape by the left inclined surface portion 45c and the right inclined surface portion 45d, but the present invention is not limited to this embodiment. Figure 8 As shown, the lower portion of the cover portion 45 may also be located toward the lateral inner side of the machine body (right side of the machine body, Figure 8 In this case, the opening 60 is formed in the lower part of the cover 45, which is located below the existence range of the rotating body 43, and the opening 60 is configured to include the lower end of the cover 45. In addition, the opening 60 is provided with a limiting member 46.

[0153] (2) In the above embodiment, the rotating body 43 and the cover 45 are provided in front of the front wall 41, but the present invention is not limited to this embodiment. For example, the rear end of the support shaft 19 of the threshing drum 12 may penetrate the rear wall (not shown) of the threshing device 6, and the rotating body 43 and the belt 44 may be provided at the rear side of the support shaft 19 relative to the rear wall. In addition, the cover 45 may be installed on the rear wall of the threshing device 6 in a state of covering the rotating body 43 and the belt 44.

[0154] (3) In the above embodiment, the belt 44 is wound around the rotating body 43 of the input pulley, but the belt 44 may be a chain, and the rotating body 43 may be a sprocket.

[0155] (4) In the above embodiment, the main body 46B of the limiting member 46 is configured in a lattice shape, but the main body 46B may be configured in a mesh shape (grid shape), or the main body 46B may be configured from a punching metal. In other words, the plurality of openings 60a may be formed in a mesh shape (grid shape), or the plurality of openings 60a may be formed in a porous shape. In addition, when the main body 46B is in a mesh shape (grid shape), the mesh of the mesh (grid shape) may be finely formed, and when the main body 46B is a punching metal, the mesh of the punching metal may be finely formed.

[0156] (5) In the above embodiment, one restricting member 46 is provided in the opening portion 60 , but two or more restricting members 46 may be provided in the opening portion 60 .

[0157] (6) In the above embodiment, the threshing device 6 is a structure for threshing the ear tip side portion of the harvested grain stalks clamped and conveyed by the supply chain 7, but the present invention is not limited to this embodiment. For example, the threshing device 6 may also be a structure for feeding the whole harvested grain stalks into the threshing chamber 13.

[0158] (7) In the above embodiment, the elastically deformable sheet member 49 covering the inlet portion 42 is provided in front of the restricting member 46 , but a configuration in which the sheet member 49 is not provided may be adopted.

[0159] It should be noted that the structure disclosed in the above-mentioned embodiment (including other embodiments, the same below) can be combined with the structure disclosed in other embodiments for application as long as no contradiction occurs. In addition, the embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be appropriately changed within the scope of the purpose of the present invention.

[0160] Industrial Applicability

[0161] The present invention can be used in a combine harvester (eg, a full-feed combine harvester, a half-feed combine harvester).

[0162] Regarding the second aspect of the present invention, a second embodiment of the present invention will be described below based on a combine harvester as an example. It should be noted that in the following description, the traveling body 1 of the combine harvester is referred to as Fig. 9 The direction of the arrow "F" shown in the figure is set to "front of the machine body", and the direction of the arrow "B" is set to "rear of the machine body". Fig. 9 Set the paper front direction to "machine left" and the paper back direction to "machine right". Fig.10 The direction of the arrow "L" shown is set to "the left side of the machine body", and the direction of the arrow "R" is set to "the right side of the machine body".

[0163] [About the Combine Harvester as a Whole]

[0164] like Fig. 9 As shown, the traveling body 1 of the combine harvester has a frame 2, and the frame 2 is composed of a plurality of steel materials such as square pipes. A pair of left and right crawler-type traveling devices 3 are equipped at the lower part of the frame 2. A driving part 5 is provided at the right lateral part of the front part of the traveling body 1. The riding space of the driving part 5 is covered by the cab. An engine E is arranged below the driving part 5. The engine E is the "drive source" of the present invention. A harvesting part 4 is arranged to be able to be raised and lowered at the front part of the traveling body 1. The harvesting part 4 harvests while supporting a plurality of upright stalks of rice and wheat (crops in the field) in front of the traveling body 1, and transports the harvested stalks toward the rear of the body. At the rear part of the frame 2, a threshing device 6 and a grain storage box 8 are supported in a horizontally arranged state. The threshing device 6 is arranged behind the harvesting part 4, and the grain storage box 8 is arranged behind the driving part 5. The threshing device 6 has a threshing cylinder 12 that is driven to rotate and a threshing chamber 13 that accommodates the threshing cylinder 12. A supply chain 7 is provided on the left side of the threshing device 6, and the supply chain 7 clamps and conveys the harvested grain stalks harvested by the harvesting section 4 to the rear. The harvested grain stalks harvested by the harvesting section 4 are input into the threshing device 6 through the supply chain 7. In the threshing device 6, the input harvested grain stalks are threshed by the threshing cylinder 12, and a sorting process is performed to sort the grains and dust obtained by the threshing process. The grain storage box 8 stores the grains conveyed from the threshing device 6. A grain discharge device 9 that takes out the grains from the grain storage box 8 is connected to the rear of the grain storage box 8.

[0165] [Regarding the cover portion of the covering tape]

[0166] like Fig.10 As shown, a threshing port for the harvested rice stalks to pass through is formed on the left side of the threshing device 6. Fig.11 as well as Fig.13 ) in the lower space of the portion covered by the cover 45 forms a threshing chamber 13 (refer to Figure 12 to Figure 14) enters the entrance section 42. The upright rice stalks in the field are harvested by the harvesting section 4 and are clamped and transported to the rear as harvested rice stalks by the supply chain 7. Then, the harvested rice stalks are thrown into the threshing chamber 13 from the entrance section 42. The supply chain 7 transports the harvested rice stalks from the harvesting section 4 while throwing the ear tips of the harvested rice stalks into the threshing chamber 13.

[0167] like Figure 10 to Figure 14 As shown, the support shaft of the threshing drum 12 passes through the front wall portion 41 of the threshing device 6, and the front end portion of the support shaft of the threshing drum 12 protrudes forward from the front wall portion 41 of the threshing device 6. A rotating body 43 for inputting power to the threshing drum 12 is provided at the front end portion of the support shaft of the threshing drum 12. The rotating body 43 is a pulley, which is the "driving wheel body" of the present invention. A belt 44 is wound around the rotating body 43. The belt 44 is the "annular rotating body" of the present invention, which transmits power from the engine E. Fig.11 In FIG. 4 , the area of ​​the rotating body 43 where the belt 44 is wound is indicated as a winding area 43R. Fig.10 as well as Fig.11 As shown, the rotating body 43 and the threshing cylinder 12 are centered on the rotating shaft Y1. Fig.11 Rotates in a clockwise direction (the direction indicated by arrow R1) on the paper.

[0168] like Fig.11 As shown, with 44 in Fig.11 The belt 44 and the rotating body 43 start to abut at the starting end 43s (upstream end) in the paper of FIG. 43. In addition, the belt 44 and the rotating body 43 are separated at the terminal 43f (downstream end). In the circumferential direction of the rotating body 43, the winding area 43R covers the starting end 43s and the terminal 43f. The upstream part of the belt 44 in the direction of rotation than the starting end 43s and the downstream part of the belt 44 in the direction of rotation than the terminal 43f extend along the tangential direction of the rotating body 43 respectively. The details will be described later, but a wall member 62 is provided on the left side of the body of the rotating body 43. The wall member 62 is provided in a state facing the winding area 43R.

[0169] The threshing drum 12 is driven to rotate in conjunction with the rotation of the rotating body 43 to thresh the harvested grain stalks. The harvested grain stalks clamped and transported to the rear by the supply chain 7 are threshed in the threshing chamber 13 by the beating and combing action based on the rotation of the threshing drum 12. A cover body 45 is installed on the front wall portion 41 of the threshing device 6 in a state of covering the rotating body 43 and the belt 44. In addition, an elastically deformable sheet member 49 is provided to cover the entrance portion 42. The sheet member 49 is, for example, a flexible rubber member, and is fixed to the lower portion of the cover body 45 by bolts. The sheet member 49 hangs down from the lower portion of the cover body 45 and covers the entrance portion 42 from the front. The sheet member 49 is fixed to the cover body 45 by a pressing member 47. The left side of the body of the cover body 45 is covered by a transverse cover body 6a, and the transverse cover body 6a is provided above the supply chain 7.

[0170] A pair of left and right stays 51, 51 (see Fig.12 as well as Fig.13 ) protrudes from the front wall portion 41 toward the front side of the machine body, and the support frame 52 is horizontally erected across a pair of left and right stays 51, 51. Fig.10 In the figure, there is a pair of left and right stays 51, 51 on the back side of the paper relative to the pair of left and right stays 45S, 45S. Fig.10 as well as Fig.12 As shown, the engaging portion 53 engaged with the buckle 45B of the cover body 45 is provided in a state of protruding toward the front side of the machine body from the right end portion of the front wall portion 41 .

[0171] The cover body 45 includes a pair of cover hooks 45H, 45H for engaging with the support frame 52. A pair of flat-plate stays 45S, 45S are welded and fixed to left and right portions of the upper end of the cover body 45. The cover hooks 45H, 45H are welded and fixed to the pair of stays 45S, 45S, respectively.

[0172] A pair of engagement holes is formed at both left and right ends of the support frame 52 , and the pair of engagement holes faces the pair of cover hooks 45H, 45H. The pair of cover hooks 45H, 45H are hooked on the pair of engagement holes, whereby the pair of cover hooks 45H, 45H are engaged with the support frame 52 .

[0173] The operator releases the engagement between the buckle 45B and the engagement portion 53, swings the cover body 45 toward the front side of the machine body, and then slides the cover body 45 upward, thereby disengaging the cover hook 45H from the support frame 52. In this way, the operator removes the cover body 45 from the machine body. In addition, the operator slides the cover body 45 downward relative to the support frame 52 and hooks the cover hooks 45H, 45H to a pair of engagement holes of the support frame 52. Thereafter, the operator swings the cover body 45 toward the rear side of the machine body, and engages the buckle 45B with the engagement portion 53. In this way, the operator can attach the cover body 45 to the machine body.

[0174] The front wall portion of the cover body 45 is formed in a plane extending up and down, and this portion is referred to as the vertical surface 45a of the cover body 45. A left inclined surface 45c and a right inclined surface 45d are formed at the lower portion of the cover body 45. The left inclined surface 45c and the right inclined surface 45d are inclined in such a manner that the lower side is located at the rear side of the body when viewed from the side of the body. The left inclined surface 45c is inclined in such a manner that the lower side is located at the rear side of the body when viewed from the front and rear direction of the body. Fig.10 The right inclined surface 45d is formed in a left rising shape in such a way that the right inclined surface 45d is located on the upper side. Fig.10 The cover body 45 is formed into a rightward rising shape in such a manner that the cover body 45 is located on the upper side. The upper end of the left inclined surface 45c is located above the upper end of the right inclined surface 45d. In this way, the cover body 45 is formed into a downwardly narrowed shape in such a manner that the width becomes narrower toward the lower side in the lateral direction of the body.

[0175] The pressing member 47 is formed into a V-shape along the inclined shape of the left inclined surface 45c and the right inclined surface 45d when viewed in the front-back direction. A welding bolt 47B is installed on the pressing member 47. In addition, a plurality of insertion holes are provided at the lower edge of the vertical surface 45a, and the plurality of insertion holes of the lower edge of the vertical surface 45a are provided at positions corresponding to the welding bolts 47B. The upper end of the sheet member 49 is pressed and fixed to the lower part of the cover body 45 by the pressing member 47. The sheet member 49 and the pressing member 47 are fastened and fixed to the lower part of the cover body 45 together by the welding bolts 47B and the nuts. The sheet member 49 is clamped by the pressing member 47 and the lower part of the vertical surface 45a.

[0176] The harvested grain stalks are clamped and conveyed to the rear by the supply chain 7, and when they are put into the threshing chamber 13 from the entrance 42, the sheet member 49 contacts the harvested grain stalks, and the lower part of the sheet member 49 is elastically deformed to the rear. Fig.12 as well as Fig.13 As shown in the figure, the left inclined surface 45c and the right inclined surface 45d are inclined so that they are located at the rear side of the machine body as they are located at the lower side. That is, even if the lower part of the sheet member 49 is elastically deformed toward the rear, a space is provided in front of the left inclined surface 45c and the right inclined surface 45d to allow the sheet member 49 to be elastically deformed. Therefore, the left inclined surface 45c and the right inclined surface 45d are unlikely to contact with the sheet member 49, and the wear of the sheet member 49 caused by the contact between the left inclined surface 45c and the right inclined surface 45d and the sheet member 49 can be suppressed.

[0177] The bottom 48 is provided with a plate-like bottom portion 48 extending across the left inclined surface portion 45c and the right inclined surface portion 45d and the front wall portion 41. The bottom portion 48 covers the rotating body 43 from below. When viewed in the front-to-back direction, the bottom portion 48 is formed into a V-shape along the inclined shape of the left inclined surface portion 45c and the right inclined surface portion 45d when viewed in the front-to-back direction. The bottom 48 is formed with a left surface portion 48a and a right surface portion 48b. When viewed in the front-to-back direction of the machine body, the left surface portion 48a is closer to the left side of the machine body ( Fig.10 The right side of the paper is formed in a left rising shape in a manner that the right side is located on the upper side. When the right side 48b is viewed in the front-back direction of the machine body, the right side ( Fig.10 The left side of the paper) is formed into a right rising shape in a manner that the upper side is located. The upper end of the left surface 48a is located at a position higher than the upper end of the right surface 48b. The cover body 45 and the bottom 48 are the "cover part" of the present invention, which is installed on the front wall part 41 and covers the rotating body 43.

[0178] [About wall parts]

[0179] like Figure 10 to Figure 14 As shown, a wall member 62 is provided on the left side of the body of the rotating body 43. The wall member 62 is provided in a region covered by the cover 45 and the bottom 48, with respect to the space S1 between the lower part of the rotating body 43 and the bottom 48, at an upstream side portion in the direction in which the lower part of the rotating body 43 rotates, so as to face the space S1. A space S2 is provided between the rotating body 43 and the wall member 62, and the space S2 is connected to the space S1.

[0180] The wall member 62 is a flat plate member formed by bending by stamping or the like. A vertical plate portion 62a and an inclined plate portion 62b are formed on the wall member 62. The vertical plate portion 62a is formed at the lower portion of the wall member 62. The inclined plate portion 62b is formed at the upper portion of the wall member 62, and is inclined in a manner that the closer to the upper side the rotating body 43 is, the closer it is to the side where the rotating body 43 is located when viewed from above. That is, the wall member 62 is bent in a manner along the outer peripheral shape of the upper portion of the rotating body 43. In the present embodiment, the upper end portion of the wall member 62 is fixed in a position on the downstream side of the top 43t of the rotating body 43 in the direction in which the upper portion of the rotating body 43 rotates. In addition, the upper end portion of the wall member 62 is fixed in a position on the downstream side of the starting end portion 43s (upstream end portion) of the winding area 43R in the direction in which the upper portion of the rotating body 43 rotates.

[0181] like Fig.13 As shown in FIG. 1 , a concave portion 62c is formed in a portion of the inclined plate portion 62b located on the front side of the machine body. In other words, the front end edge of the inclined plate portion 62b in the machine body front-back direction is located on the rear side of the machine body compared to the front end edge of the vertical plate portion 62a in the machine body front-back direction. According to this structure, interference between the inclined plate portion 62b and the engaging portion 53 is avoided.

[0182] like Fig.11 As shown, the wall member 62 is fixed to the front wall portion 41 of the threshing device 6 by bolts. A first support plate portion 62e and a second support plate portion 62f are formed on the wall member 62. The first support plate portion 62e is bent in an L-shape from the rear edge of the body of the vertical plate portion 62a, and is along the surface portion of the front wall portion 41. In addition, the second support plate portion 62f is bent in an L-shape from the rear edge of the body of the inclined plate portion 62b, and is along the surface portion of the front wall portion 41. Insertion holes for bolts are respectively provided in the first support plate portion 62e and the second support plate portion 62f. In addition, two fastening holes for bolt fastening are provided in the front wall portion 41.

[0183] like Fig.10 as well as Fig.13 As shown, the stay 63 is supported by the front wall 41. The stay 63 is a flat plate member bent into an L-shape, and the rear surface portion of the stay 63 is welded and fixed to the front wall 41. The extended portion of the stay 63 extends forward of the front wall 41. Two insertion holes for bolt insertion are provided at the lower portion of the vertical plate portion 62a. In addition, two fastening holes for bolt fastening are provided at the extended portion of the stay 63.

[0184] The operator overlaps each fastening hole of the front wall portion 41 with each insertion hole of the first support plate portion 62e and the second support plate portion 62f, and fastens the bolt to the fastening hole of the front wall portion 41. In addition, the operator overlaps each fastening hole of the stay 63 with each insertion hole of the lower portion of the vertical plate portion 62a, and fastens the bolt to the fastening hole of the stay 63. Thus, the wall member 62 is supported by the front wall portion 41 and the stay 63. Since the vertical plate portion 62a is supported by the stay 63, the rigidity of the wall member 62 is improved compared with a structure in which the wall member 62 is cantilevered only by the surface portion of the front wall portion 41. In addition, since the vertical plate portion 62a and the inclined plate portion 62b are bent, the rigidity of the wall member 62 is improved compared with a structure in which the wall member 62 is a coplanar plate.

[0185] like Fig.13 As shown, in the front-rear direction of the machine body, the width of the vertical plate portion 62a is larger than the width of the bottom 48, and the front edge of the vertical plate portion 62a extends to the front upper part of the left inclined surface 45c. Therefore, when the cover body 45 is mounted on the front wall 41 of the threshing device 6, the front lower edge of the vertical plate portion 62a abuts against the left inclined surface 45c, and the lower edge of the vertical plate portion 62a abuts against the bottom 48. Thus, the wall member 62 stands up from the bottom 48.

[0186] like Fig.11As shown, the space S2 between the rotating body 43 and the wall member 62 and the space S1 between the rotating body 43 and the bottom 48 are narrower than the space S3 on the left side of the machine body relative to the wall member 62. When the belt 44 rotates, air flows around the belt 44 to some extent in the direction of rotation of the belt 44. Therefore, even if dust or the like enters each of the spaces S1 and S2, the dust or the like continues to be suspended along with the flow of air around the belt 44, and the dust or the like is hardly accumulated in the spaces S1 and S2.

[0187] [About the opening of the cover]

[0188] like Fig.12 as well as Fig.14 As shown, an opening 60 is formed in the left surface 48a of the bottom 48 formed in a V shape. The portion indicated by L11 in the bottom 48, that is, the portion on the side opposite to the side where the rotating body 43 is located with respect to the wall member 62, is recessed toward the rear of the machine body, and the recessed portion is the opening 60. The opening 60 is biased toward the left side of the machine body in the width direction of the threshing device 6. In addition, the opening 60 is formed at a position closer to the left side of the machine body than the overlapping portion of the bottom 48 overlapping with the rotating body 43 when viewed from above. The opening 60 allows foreign matter entering the space S3 to fall.

[0189] The opening 60 is provided with a restricting member 61, which restricts foreign matter from entering the space S3 from the opening 60. The restricting member 61 has a base 61A and a main body 61B. The base 61A is formed in a flat plate shape, and two welding bolts 61m, 61m are welded and fixed to the base 61A. The main body 61B is a rod-shaped member bent into a C shape, and a pair of terminal ends in the main body 61B are welded and fixed to the base 61A.

[0190] Two mounting holes for mounting the limiting component 61 are provided on the left inclined surface 45c of the cover body 45. The operator inserts two welding bolts 61m, 61m into the two mounting holes of the left inclined surface 45c, and fastens two nuts 61n, 61n to the welding bolts 61m, 61m while pressing the base 61A to the left inclined surface 45c. Thus, the limiting component 61 is supported on the cover body 45. One of the two mounting holes provided on the left inclined surface 45c is formed as a round hole, and the other is formed as a long hole. Therefore, the dimensional error between the interval between the two welding bolts 61m, 61m and the interval between the two mounting holes of the left inclined surface 45c is allowed by the long hole, and the operator can easily mount the limiting component 61 on the cover body 45.

[0191] When the limiting member 61 is mounted on the cover body 45 and the cover body 45 is mounted on the front wall portion 41 of the threshing device 6, the main body 61B of the limiting member 61 is located in the central area of ​​the opening 60. The main body 61B is configured in a C shape, so that the opening 60 is divided into two openings 60a by the main body 61B of the limiting member 61. As a result, each of the openings 60a formed in the gap of the main body 61B in the opening 60 becomes smaller, and it is difficult for foreign matter such as stalks to enter the internal space of the cover body 45 from the opening 60. In addition, since the spaces S1, S2 and the space S3 are separated by the wall member 62, even if foreign matter enters the internal space of the cover body 45 from the opening 60, the foreign matter stays in the space S3 and is difficult to enter the spaces S1 and S2.

[0192] Dust and the like are mostly guided to the space S3 by the flow of air along the rotation direction of the belt 44, and are easily accumulated in the portion of the bottom 48 on the side of the space S3 away from the rotating body 43, but by forming the structure of the opening portion 60 below the space S3, dust and the like are almost not accumulated in the space S3. In addition, most of the dust and the like in the internal space covered by the cover body 45 and the bottom 48 falls downward from the opening portion 60. In addition, even if dust and the like are accumulated in a mass around the opening portion 60 of the bottom 48, due to the presence of the wall member 62, the mass of dust and the like will not move toward the rotating body 43.

[0193] [Other implementation methods]

[0194] The present invention is not limited to the configurations described in the above-described embodiments, and other representative embodiments of the present invention will be described below.

[0195] (1) In the above embodiment, the wall member 62 is composed of the vertical plate portion 62a and the inclined plate portion 62b, but the present invention is not limited to this embodiment. Fig.15 as well as Fig.16 As shown, the wall part 62 may also be composed of a vertical plate portion 62o, a first inclined plate portion 62p, and a second inclined plate portion 62q. The first inclined plate portion 62p is inclined in a manner that the upper side is closer to the side where the rotating body 43 is located when viewed from above, and the second inclined plate portion 62q is more inclined than the first inclined plate portion 62p. The second inclined plate portion 62q extends along a portion of the belt 44 that is upstream of the starting end portion 43s in the direction of rotation. The extended top end portion of the second inclined plate portion 62q is closer to the starting end portion 43s than the extended top end portion of the inclined plate portion 62b shown in the above embodiment. Therefore, if it is Fig.15 as well as Fig.16 The structure of the wall member 62 shown makes it difficult for dust and the like to enter the spaces S1 and S2 compared with the above-described embodiment.

[0196] exist Fig.15In the example shown, the upper end of the wall member 62 is fixed at a position downstream of the starting end 43s (upstream end) of the winding region 43R in the direction of rotation of the upper portion of the rotating body 43. Fig.15 In the example shown, the upper end of the wall member 62 is fixed downstream from the top 43t of the rotating body 43 in the direction of rotation of the upper part of the rotating body 43. With this configuration, the structure of the wall member 62 is compact and simple.

[0197] exist Fig.16 In the example shown, the upper end of the wall member 62 extends to a position upstream of the starting end 43s (upstream end) of the winding region 43R in the direction in which the upper portion of the rotating body 43 rotates. Fig.16 In the example shown, the upper end of the wall member 62 extends to a position upstream of the top 43t of the rotating body 43 in the direction in which the upper part of the rotating body 43 rotates. According to this structure, the upper part of the rotating body 43 is firmly covered by the wall member 62, and dust is difficult to enter the spaces S1 and S2.

[0198] Apart from Fig.15 as well as Fig.16 In addition to the example shown, for example, the upper end of the wall member 62 may extend to a position upstream of the start end 43s (upstream end) of the winding region 43R in the direction in which the upper portion of the rotating body 43 rotates, and may be fixed at a position downstream of the top 43t of the rotating body 43. In addition, the upper end of the wall member 62 may extend to a position upstream of the top 43t of the rotating body 43 in the direction in which the upper portion of the rotating body 43 rotates, and may be fixed at a position downstream of the start end 43s (upstream end) of the winding region 43R.

[0199] (2) In the above embodiment, the upper portion of the wall member 62 is curved along the outer peripheral shape of the upper portion of the rotating body 43, but the present invention is not limited to this embodiment. Fig.17 In the example shown, the belt 44 extends to the left of the machine body relative to the rotating body 43. Fig.17 The upper part of the wall member 62 may be extended along the extension direction of the upstream part of the belt 44, and the structure may be farther away from the rotating body 43 as it moves upward. Fig.17 In the illustrated example, the wall member 62 is also provided in a state facing the space S1 .

[0200] (3) In the above embodiment, the rotating body 43 and the cover body 45 are arranged in front of the front wall portion 41, but the present invention is not limited to this embodiment. For example, the rear end of the support shaft of the threshing drum 12 may also penetrate the rear wall portion (not shown) of the threshing device 6, and the portion of the support shaft that is closer to the rear side than the rear wall portion is provided with the rotating body 43 and the belt 44. In addition, the cover body 45 may be installed on the rear wall portion of the threshing device 6 in a state of covering the rotating body 43 and the belt 44.

[0201] (4) In the above embodiment, the belt 44 is wound around the rotating body 43 of the input pulley, but the belt 44 may be a chain, and the rotating body 43 may be a sprocket.

[0202] (5) In the above-mentioned embodiment, the main body 61B of the limiting component 61 is configured as a rod, but the main body 61B may be configured as a mesh (grid) shape, and the main body 61B may be configured as a punching metal. In other words, the plurality of openings 60a may be formed as a mesh (grid) shape, and the plurality of openings 60a may be formed as porous. In addition, when the main body 61B is a mesh (grid) shape, the mesh of the mesh (grid) shape may be finely formed, and when the main body 61B is a punching metal, the mesh of the punching metal may be finely formed. That is, the opening 60 may be divided into a plurality of openings by the limiting component 61.

[0203] (6) In the above embodiment, one restricting member 61 is provided in the opening 60 , but two or more restricting members 61 may be provided in the opening 60 .

[0204] (7) In the above embodiment, the threshing device 6 is a structure for threshing the ear tip side portion of the harvested grain stalks clamped and conveyed by the supply chain 7, but the present invention is not limited to this embodiment. For example, the threshing device 6 may also be a structure for feeding the whole harvested grain stalks into the threshing chamber 13.

[0205] (8) In the above embodiment, the elastically deformable sheet member 49 covering the inlet portion 42 is provided in front of the restricting member 61 , but a configuration in which the sheet member 49 is not provided may be adopted.

[0206] (9) In the above embodiment, the opening 60 is formed in the portion of the bottom 48 that is located on the opposite side of the wall member 62 to the side where the rotating body 43 is located (the portion below the space S3), but the present invention is not limited to this embodiment. For example, the opening 60 may be formed in the portion of the bottom 48 that overlaps with the rotating body 43 when viewed from above.

[0207] It should be noted that the structure disclosed in the above-mentioned embodiment (including other embodiments, the same below) can be combined with the structure disclosed in other embodiments for application as long as no contradiction occurs. In addition, the embodiments disclosed in this specification are illustrative, and the embodiments of the present invention are not limited thereto, and can be appropriately changed within the scope of the purpose of the present invention.

[0208] Industrial Applicability

[0209] The present invention can be used in a combine harvester (eg, a full-feed combine harvester, a half-feed combine harvester).

Claims

1. A combine harvester, wherein: The combine harvester has: a harvesting section that harvests crops in the field and transports them toward the rear of the machine body; and A threshing device is input into the crops harvested by the harvesting unit to thresh the input crops. The threshing device includes a threshing drum that is rotationally driven to thresh crops and a threshing chamber that accommodates the threshing drum. The front and rear ends of the support shaft of the threshing cylinder penetrate the front and rear walls of the threshing device, and a portion of the support shaft that protrudes outward from the device beyond the wall is provided with a driving unit that inputs power to the threshing cylinder. The combine harvester includes a cover portion attached to the wall portion in a state of covering the driving portion. An opening is formed at a lower portion of the cover portion, and the opening allows foreign matter that has entered a space between the wall portion and the cover portion to fall.

2. The combine harvester according to claim 1, wherein: The said opening part is formed in the center area of ​​the lower part of the said cover part in the width direction of the said threshing device.

3. The combine harvester according to claim 1 or 2, wherein: The opening is formed in a portion of the lower portion of the cover that is located below a range where the driving unit exists.

4. The combine harvester according to claim 1 or 2, wherein: The driving unit is composed of a transmission belt and a rotating body around which the belt is wound. The opening is formed in a portion of the lower portion of the cover that is close to the belt.

5. The combine harvester according to claim 1 or 2, wherein: The cover portion is formed into a downwardly tapered shape in such a way that the width becomes narrower toward the lower side. The opening portion is configured to include a lower end portion of the cover portion.

6. The combine harvester according to claim 1 or 2, wherein: The combine harvester includes a supply chain for conveying crops from the harvesting section while putting crop tips into the threshing chamber. The support shaft passes through the front wall of the threshing device, and the driving unit is arranged in front of the front wall. An inlet for allowing crops transported by the supply chain to enter the threshing chamber is formed in a lower region of the front wall portion covered by the cover portion. The opening portion is provided with a restriction member that restricts entry of foreign matter from the opening portion into the space.

7. The combine harvester according to claim 6, wherein: The opening portion is partitioned into a plurality of openings by the limiting member.

8. The combine harvester according to claim 6, wherein: The combine harvester includes: a sheet member having flexibility, hanging from the lower portion of the cover portion and covering the entrance portion from the front; and a pressing member for pressing and fixing an upper end portion of the sheet member. The limiting member includes a main body portion located at the opening portion and a base portion supported at a lower portion of the cover portion. The base and the pressing member are fastened together to a lower portion of the cover by a fastener.

9. A combine harvester, wherein: The combine harvester has: a harvesting section that harvests crops in the field and transports them toward the rear of the machine body; and A threshing device, the threshing device having a threshing cylinder driven for rotation and a threshing chamber for accommodating the threshing cylinder, the threshing device is fed with crops harvested by the harvesting unit, and the threshing cylinder is used to thresh the fed crops, The front and rear ends of the support shaft of the threshing drum penetrate the front and rear walls of the threshing device, and a driving wheel body around which an annular rotating body is wound is provided at a portion of the support shaft that protrudes outward from the device more than the wall, and the annular rotating body transmits power from a driving source. The combine harvester includes a cover portion mounted on the wall portion and covering the driving wheel body. The cover portion includes a bottom portion that covers the driving wheel body from below, In the region covered by the cover portion, a wall member is provided at a location located upstream of a space between a lower portion of the driving wheel body and the bottom portion in a direction in which the lower portion rotates so as to face the space.

10. The combine harvester according to claim 9, wherein: The upper portion of the wall member is curved so as to follow the outer peripheral shape of the upper portion of the driving wheel body.

11. The combine harvester according to claim 9 or 10, wherein: The upper end portion of the wall member extends to a position on the upstream side above the top of the driving wheel body in the direction in which the upper portion of the driving wheel body rotates.

12. The combine harvester according to claim 9 or 10, wherein: The upper end portion of the wall member is fixed at a position on the downstream side above the apex of the driving wheel body in the direction in which the upper portion of the driving wheel body rotates.

13. The combine harvester according to claim 9 or 10, wherein: The wall member is disposed in a state facing the winding area of ​​the driving wheel body around which the endless rotating body is wound. The upper end portion of the wall member extends to a position on the upstream side of the upstream end portion of the winding region in the direction in which the upper portion of the driving wheel body rotates.

14. The combine harvester according to claim 9 or 10, wherein: The wall member is disposed in a state facing the winding area of ​​the driving wheel body around which the endless rotating body is wound. The upper end portion of the wall member is fixed at a position downstream of an upstream end portion of the winding region in a direction in which the upper portion of the driving wheel body rotates.

15. The combine harvester according to claim 9 or 10, wherein: The wall member stands upright from the bottom.

16. The combine harvester according to claim 9 or 10, wherein: An opening portion for allowing foreign matter that has entered the space between the wall portion and the cover portion to fall is formed in a portion of the bottom portion on the opposite side of the wall member from the driving wheel body.

17. The combine harvester according to claim 16, wherein: The opening is provided with a restricting member which restricts foreign matter from entering the space from the opening. The opening portion is partitioned into a plurality of openings by the limiting member.

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