JP7266557B2 - combine - Google Patents

Description

The present invention relates to combine harvesters.

For example, in the threshing apparatus 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) faces the wall ("front wall" in the document). penetrates. A driving portion (“input pulley” in the literature) is provided on a portion of the support shaft that protrudes outside the device from the wall portion, and a cover portion is attached to the wall portion in a state of covering the driving portion.

Japanese Patent Application Laid-Open No. 2019-110770

The cover disclosed in Patent Literature 1 covers the entire driving section, thereby reducing the risk of foreign matter entering the internal space of the cover. However, it is conceivable that a foreign object may enter through a gap between the wall portion and the cover portion. If foreign matter enters the space between the wall and the cover portion through the gap, the foreign matter is less likely to escape from the inner space of the cover portion. For this reason, foreign matter may accumulate in the internal space of the cover over a long period of time, hindering the rotational driving of the drive unit.

SUMMARY OF THE INVENTION An object of the present invention is to provide a combine harvester in which foreign matter does not accumulate in the inner space of the cover.

The combine harvester of the present invention includes a harvesting unit that harvests crops in a field and conveys them toward the rear of the machine body, and a threshing device that receives the crops harvested by the harvesting unit and threshes the harvested crops. The threshing device is provided with a threshing cylinder for threshing the crops by rotationally driving it, and a threshing chamber for housing the threshing cylinder, and the front and rear ends of the support shaft of the threshing cylinder are: A drive unit for inputting power to the threshing cylinder is provided in a portion of the support shaft that penetrates through one of the front and rear wall portions of the threshing device and projects outside the device beyond the wall portion, A cover portion attached to the wall portion is provided so as to cover the drive portion, and an opening is provided in a lower portion of the cover portion to allow foreign matter that has entered a space between the wall portion and the cover portion to fall. a portion is formed , and the opening is provided with a restricting member that restricts foreign matter from entering the space from the opening .

According to the present invention, an opening is formed in the lower portion of the cover portion. Therefore, even if foreign matter enters the internal space of the cover portion, the foreign matter quickly falls downward from the opening. This eliminates the risk of foreign matter accumulating in the internal space of the cover portion. As a result, a combine harvester in which foreign matter does not accumulate in the inner space of the cover is realized. Further, with this configuration, since the opening is provided with the restricting member, it is even more difficult for foreign matter to accumulate in the internal space of the cover.

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

With this configuration, since the opening is formed in the central region of the lower portion of the cover portion, the openings are formed in the left and right regions of the lower portion of the cover portion compared to the configuration in which the opening portions are formed at the left and right ends of the lower portion of the cover portion. Foreign matter in the positively falls through the opening in the central region. For this reason, it becomes more difficult for foreign matter to accumulate in the internal space of the cover portion.

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 the existence range of the driving portion.

According to this configuration, since the opening is positioned below the range in which the drive section exists, foreign matter in the area below the drive section actively falls from the opening. Therefore, it is possible to further reduce the risk that foreign matter will accumulate in the inner space of the cover portion and hinder the rotational driving of the driving portion.

In the present invention, the drive section includes a power transmission belt and a rotating body around which the belt is wound, and the opening is a portion of the lower portion of the cover section that is adjacent to the belt. is preferably formed in

If foreign matter is present in the drive portion of the belt, there is a risk that the foreign matter will be caught between the rotating body and the belt. With this configuration, since the opening is formed in a portion adjacent to the belt, the possibility of impeding the rotational driving of the drive unit is further reduced.

In the present invention, it is preferable that the cover portion is formed in a downward tapering shape so that the width becomes narrower toward the bottom, and the opening portion is configured to include the lower end portion of the cover portion.

With this configuration, since the cover portion is formed in a shape that converges downward, even if a foreign object enters the internal space of the cover portion, the foreign substance will travel along the portion of the constricted downward shape to the lower end of the cover. be guided to the department. Furthermore, since the opening is configured to include the lower end portion of the cover portion, the foreign matter positively falls downward from the lower end portion region of the cover portion. This makes it even more difficult for foreign matter to accumulate in the internal space of the cover portion.

In the present invention, a feed chain is provided for conveying the crops from the reaping unit with the tips of the crops thrown into the threshing chamber, the support shaft passing through the front wall portion of the threshing device, and the The drive section is provided in front of the front wall section, and has an entrance section for the crops conveyed by the feed chain to the hoisting chamber in a region below a portion of the front wall section covered by the cover section. is preferably formed .

If the entrance to the chamber is formed in the lower region of the cover, there is a risk that the crops conveyed by the feed chain will enter the inner space of the cover through the opening. With this configuration, since the regulating member is provided in the opening, it becomes more difficult for foreign matter to accumulate in the internal space of the cover, and the crops conveyed by the feed chain enter the internal space of the cover through the opening. it gets harder.

In the present invention, it is preferable that the opening is partitioned into a plurality of openings by the regulating member.

According to this configuration, since the regulating member partitions the opening into a plurality of openings, it is possible to reduce the size of each opening in the opening. This makes it difficult for crops to enter the internal space of the cover through the opening.

In the present invention, a flexible sheet member that hangs down from the lower part of the cover part and covers the inlet part from the front, and a pressing member that presses and fixes the upper end of the sheet member are provided, The regulating member includes a main body positioned in the opening and a base supported under the cover. It is preferably fastened.

According to this configuration, since the base portion and the pressing member are fastened and fixed to the lower portion of the cover portion by the fastener, the restricting member is firmly supported by the lower portion of the cover portion. Further, since the pressing member presses and fixes the upper end portion of the sheet member, the lower portion of the cover portion is used both as a supporting member for the regulating member and a supporting member for the sheet member. This simplifies the structure for supporting the regulating member and the seat member.

It is the whole combine side view. It is a figure which shows a threshing apparatus typically. It is a longitudinal cross-sectional view which shows a rocking|swiveling sorting apparatus. FIG. 4 is a graph showing the width of the interval between chaflips for each chaflip position. It is a front view which shows the rotary body with which the front wall part of the threshing device, the cover part, and the opening part were equipped. FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5, showing the rotating body, the cover and the opening provided on the front wall of the threshing device; FIG. 6 is a cross-sectional view taken along the line VII-VII of FIG. 5 showing the rotating body, the cover and the opening provided on the front wall of the threshing device; It is a front view which shows the cover part and opening part of another embodiment.

Hereinafter, an embodiment which is an example of the present invention will be described based on a combine. In the following description, regarding the traveling machine body 1 of the combine, the direction of the arrow "F" shown in FIGS. 1 and 2 is defined as "front of the machine", and the direction of the arrow "B" is defined as "back of the machine". 1 and 2, the direction toward the front side of the paper surface is defined as "left side of the machine body", and the direction toward the back side of the paper surface is defined as "right side of the machine body". The direction of the arrow "L" shown in FIG. 5 is defined as "left side of the machine body", and the direction of the arrow "R" is defined as "right side of the machine body".

[Regarding the entire combine harvester]
As shown in FIG. 1, a traveling machine body 1 of a combine is provided with a machine body frame 2, and the machine body frame 2 is constructed by connecting a plurality of steel materials such as square pipe materials. A pair of left and right crawler-type traveling devices 3 are provided on the lower portion of the body frame 2 . A driving unit 5 is provided on the right side portion of the front portion of the traveling body 1 . A boarding space for the driving unit 5 is covered with a cabin. An engine E is arranged below the operating section 5 . A reaping unit 4 is provided on the front part of the traveling body 1 so as to be able to move up and down. The reaping unit 4 reaps the planted culms (crops) of rice or wheat on a plurality of planting rows in front of the traveling machine body 1 while raising them, and conveys the cut stalks towards the rear of the machine body. A threshing device 6 and a grain storage tank 8 are supported side by side on the rear portion of the body frame 2 . The threshing device 6 is arranged behind the reaping unit 4 , and the grain storage tank 8 is arranged behind the operation unit 5 . A feed chain 7 is provided on the left side of the threshing device 6, and the feed chain 7 nips and conveys the harvested grain culms harvested by the harvesting unit 4 backward. In the threshing device 6, a threshing process is performed on the harvested grain culms that have been thrown in, and a sorting process for sorting out the grains obtained by the threshing process and dust is performed. The grain storage tank 8 stores grains transported from the threshing device 6 . A grain discharge device 9 for taking out grains from the grain storage tank 8 is connected to the rear portion of the grain storage tank 8 .

[Threshing device]
A threshing device 6 is shown in FIG. A threshing device 6 is provided with a threshing section 10 and a sorting section 11 . The threshing unit 10 threws the crops, and the sorting unit 11 sorts the threshed processed material while conveying it rearward. A threshing section 10 is provided with a threshing drum 12, a receiving net 14, a separation drum 15, and a dust discharge fan 16. - 特許庁A threshing chamber 13 is formed in the threshing part 10, and the threshing chamber 13 accommodates a threshing drum 12.例文帳に追加A handling cylinder 12 is provided in a handling chamber 13 so as to extend in the longitudinal direction of the machine body, and the handling cylinder 12 is rotatable around a rotation axis Y1 extending in the longitudinal direction of the machine body.

The handling cylinder 12 is provided with a handling cylinder drum 17, a plurality of handling teeth 18, and a support shaft 19. - 特許庁The longitudinal direction of the support shaft 19 is along the rotation axis Y1, and the handling drum 17 rotates integrally with the support shaft 19. As shown in FIG. The servicing teeth 18 are mounted on the circumferential surface of the servicing drum 17 . The front end of the support shaft 19 of the threshing drum 12 passes through the front wall 41 of the threshing device 6 . A rotating body 43 for inputting power to the threshing cylinder 12 is provided on a portion of the support shaft 19 that protrudes outside the threshing device 6 beyond the front wall portion 41 . The rotor 43 is a pulley.

A power transmission belt 44 (see FIGS. 5 to 8) is wound around the rotating body 43 and an output pulley (not shown), and power from the engine E is input to the rotating body 43 via the output pulley. be. The rotating body 43 and the belt 44 are the "driving part" in the present invention. In other words, the power transmission belt 44 and the rotating body 43 around which the belt 44 is wound constitute the "driving section" of the present invention.

The left side of the threshing device 6 is formed with a threshing opening through which harvested culms pass. An entrance portion 42 to the threshing chamber 13 is formed in a lower region of a portion of the front wall portion 41 of the threshing device 6 covered by the cover portion 45 (see FIGS. 5 and 6). Harvested grain culms that are harvested by the harvesting unit 4 and are clamped and conveyed rearward by the feed chain 7 are thrown into the handling chamber 13 from the inlet 42 . Then, the feed chain 7 conveys the harvested grain culms from the harvesting unit 4 in a state in which the tips of the harvested grain culms are thrown into the handling chamber 13 .

In conjunction with the rotary drive of the rotating body 43, the threshing cylinder 12 is rotated to thresh the harvested culms. Harvested grain culms held and conveyed rearward by the feed chain 7 are threshed in the threshing chamber 13 by being struck and combed by the rotation of the threshing cylinder 12 . A receiving net 14 is provided below the handling cylinder 12 . A separation drum 15 is provided behind the handling cylinder 12 . The separation drum 15 is a diffusion drum, and facilitates the flow down of single grains and the like contained therein through the objects to be sorted. A dust discharge fan 16 for discharging dust to the outside is provided behind the separation drum 15 .

A cover portion 45 is attached to the front wall portion 41 of the threshing device 6 so as to cover the rotating body 43 and the belt 44 . Also, an elastically deformable sheet member 49 is provided to cover the inlet portion 42 . The sheet member 49 is, for example, a flexible rubber member, and is bolted to the lower portion of the cover portion 45 . A sheet member 49 hangs down from the lower portion of the cover portion 45 to cover the entrance portion 42 from the front. An upper end portion of the sheet member 49 is pressed and fixed to the lower portion of the cover portion 45 by a pressing member 47 .

The sorting section 11 is provided below the threshing section 10 , that is, below the threshing device 6 . The sorting unit 11 includes an oscillating sorting device 21, a main winnow 22A, a first sub-winnow 22B, a second sub-winnow 22C, a first product recovery unit 23, a second product recovery unit 24, and a slope unit 37. and is provided. The oscillating sorting device 21 has a frame-shaped sieve case 21A formed in a rectangular shape in plan view, and oscillates sorting objects by oscillating the sieve case 21A. The main winnow 22A blows sorting air to the lower sorting area (precise sorting area) in the swing sorting device 21 . The first sub winnow 22B blows sorting air to the upper sorting area (rough sorting area) in the swing sorting device 21 . The second sub winnow 22</b>C blows sorting air to the rear sorting area of the swing sorting device 21 .

The first product recovery unit 23 and the second product recovery unit 24 are provided below the sheave case 21A. The first grain collecting unit 23 collects the treated material leaked from the sieve case 21A as the first grain (single granulated grain, etc.). The secondary crop recovery unit 24 is provided behind the primary crop recovery unit 23, and recovers the processed products leaked from the rear portion of the sieve case 21A as secondary grains (grains with branch stems, etc.). A first screw 25 is provided in the first grain recovery part 23, and the first screw 25 conveys the first grain to the right. A grain lifting device 26 is interlocked with the right end of the first screw 25 , and the grain lifting device 26 conveys the first grain to the grain storage tank 8 . A secondary screw 27 is provided in the secondary harvesting part 24, and the secondary screw 27 transports secondary grains to the right. A second reducing device 28 is interlocked with the right end of the second screw 27, and the second reducing device 28 returns the second grain to the sieve case 21A.

The rocking sorting device 21 is provided with a first grain pan 32 , a second grain pan 33 , a chaff sieve 34 , a grain sieve 35 and a straw rack 36 . Each of the first grain pan 32, the second grain pan 33, the chaff sieve 34, the grain sieve 35 and the straw rack 36 is supported by the sieve case 21A. An eccentric cam type drive mechanism 31 is provided at the rear of the sheave case 21A, and when the drive mechanism 31 is driven, the sheave case 21A as a whole swings.

The first grain pan 32 is provided at the transfer starting end of the sieve case 21A, and sorts by specific gravity while feeding the processed material backward. The second grain pan 33 is provided at the rear of the first grain pan 32, and sorts out the treated material leaking from the rear of the receiving net 14 by specific gravity while sending it rearward.

The second grain pan 33 is provided closer to the second reducing device 28 than the first grain pan 32, and most of the second grains discharged from the second reducing device 28 are received by the second grain pan 33. , undergoes gravity sorting in the second grain pan 33 . Chaff sieve 34 is positioned below first grain pan 32 and second grain pan 33 . The grain sieve 35 is arranged below the chaff sieve 34 .

A sieve line 33a is attached to the rear of the second grain pan 33 . The sieve lines 33a extend rearward from the rear portion of the second grain pan 33 and are spaced apart in the left-right direction of the fuselage. A rear portion of the chaff sieve 34 and a straw rack 36 are arranged below the sieve 33a. The sieve 33a loosens the processed material from the second grain pan 33 and allows the processed material to flow downward.

As shown in FIG. 3, a weld bolt 21B is fixed to the lower edge of the chaff sheave 34 in the sheave case 21A, and the grain sheave 35 is engaged with the weld bolt 21B from below and fixed with a nut 21N. That is, the grain sheave 35 is fastened and fixed to the lower edge of the sheave case 21A.

As shown in FIGS. 2 and 3, the slope portion 37 is provided below the sheave case 21A, and is connected to a portion of the sheave case 21A on the rear side of the rear end portion of the grain sheave 35 in the front-rear direction. there is The slope portion 37 is formed in a shape that slopes toward the first article collecting portion 23 . In other words, the slope portion 37 extends forwardly downward from a position corresponding to the rear end portion of the chaff sheave 34 in the front-rear direction toward the first article collecting portion 23 . The extended end portion of the slope portion 37 is located in the area of the first article collecting portion 23 . Among the processed materials leaked from the chaff sieve 34 , the processed materials leaked downward from the grain sieve 35 fall to the first material recovery section 23 or the slope section 37 . The treated material that has fallen onto the first grain collecting section 23 or the slope section 37 is collected by the first grain collecting section 23 as the first grain.

The straw rack 36 is arranged behind the chaff sieve 34 . Of the processed materials transported to the straw rack 36, the processed materials that have leaked from the straw rack 36 are collected by the secondary grain recovery unit 24 as secondary grains.

[Structure of chaff sieve]
As shown in FIG. 3, the chaff sieve 34 is configured to be adjustable in opening. A plurality of chaff lip plates 34A are provided on the chaff sieve 34, and each of the chaff lip plates 34A extends across the sheave case 21A. A plurality of chaflip plates 34A are arranged at predetermined intervals in the front-rear direction (conveyance direction), and the treated material can leak through the gaps d1 and d2 between the chaflip plates 34A. The longitudinal direction of each of the chaflip plates 34A extends along the lateral direction of the fuselage. Each of the chaflip plates 34A is configured to be rotatable around a horizontal axis in the lateral direction of the machine body, and is interlockingly connected to each other by a connecting rod 34B (link mechanism). Therefore, the entirety of the plurality of chaflip plates 34A rotate in synchronism. The opening degrees of the gaps d1 and d2 between the chaflip plates 34A can be changed by the rotation mechanism of the chaflip plates 34A. Each chaflip plate 34A is inclined so as to have the same rotation angle. Each chaflip plate 34A is always parallel regardless of the rotation angle.

In the present embodiment, the gaps d1 and d2 between the chaflip plates 34A are defined as the lower surface portion (rear surface portion) of the front side chafflip plate 34A and the rear side chafflip plate 34A of the chafflip plates 34A adjacent to each other in the front and rear. is the separation distance between the upper surface portion (rear surface portion) of the Each of the chaflip plates 34A has a thickness, and the gaps d1 and d2 between the chaflip plates 34A are distances excluding the thick portions of the chaflip plates 34A.

In this embodiment, the gap between the chaflip plates 34A is set in two stages across the front and rear, and as shown in FIGS. is set. The gaps d1 and d2 shown in FIGS. 3 and 4 are shown as gaps at arbitrary rotation angles of the chaflip plate 34A. Since the gaps d1 and d2 are proportional to the rotation angle of the chaflip plate 34A, the ratio of (d1/d2) is always constant regardless of the rotation angle of the chaflip plate 34A.

Of the chaff sheaves 34, the chaff lip plates 34A are arranged so that the distance between the chaff lip plates 34A positioned in the rear portion L2 is wider than the distance between the chaff lip plates 34A positioned in the front portion L1. are placed. A gap d2 between the chaflip plates 34A located in the rear portion L2 is configured to be wider than a gap d1 between the chaflip plates 34A located in the front portion L1. In the present embodiment, each of the chaflip plates 34A located in the front portion L1 is called a "first chaflip plate". Further, in the present embodiment, each of the chaflip plates 34A located in the rear part L2 is called a "second chaflip plate". Each of the chaff lip plates 34A located in the rearward portion L2 is provided in a position on the rear side of the area directly above the first article collecting portion 23 in the chaff sieve 34. As shown in FIG. In FIG. 3, 14F indicates the location where the rear end of the receiving net 14 is positioned in the front-rear direction, and each of the chafflip plates 34A positioned in the rearward portion L2 is located from the location indicated by 14F. is also behind.

A second grain pan 33 is arranged above the chaff sieve 34 . The second grain pan 33 overlaps the boundary region between the front portion L1 and the rear portion L2 in the front-rear direction (conveyance direction). A plurality of chaflip plates 34A positioned in the rear portion L2 overlap the second grain pan 33 in the transport direction. A region in which the second grain pan 33 exists in the transport direction is indicated by a region L3 in FIG. The region L3 where the second grain pan 33 exists and the region of the rearward portion L2 where the second chaflip plate is located overlap in the conveying direction. In addition, there is a region of the rear part L2 where the second chaflip plate is positioned just below the sieve 33a.

[About the cover that covers the belt]
As described above with reference to FIG. 2 , the support shaft 19 projects 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 . A cover portion 45 is attached to the front wall portion 41 of the threshing device 6 to cover the rotating body 43 and the belt 44 .

As shown in FIGS. 5 and 6, two stays 51, 51 for supporting the upper portion of the cover portion 45 protrude from the front wall portion 41 toward the front side of the fuselage, and are supported across the two stays 51, 51. A frame 52 extends horizontally. Further, an engaging portion 53 that engages with the buckle 45B of the cover portion 45 is provided in a state of protruding forward from the right end portion of the front wall portion 41 .

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

A pair of engagement holes are formed in the left and right ends of the support frame 52, and the pair of engagement holes face the pair of cover hooks 45H, 45H. The pair of cover hooks 45H, 45H are engaged with the support frame 52 by hooking the pair of cover hooks 45H, 45H to the pair of engagement holes.

The operator releases the engagement between the buckle 45B and the engaging portion 53, rocks the cover portion 45 toward the front side of the machine body, and then slides the cover portion 45 upward, thereby supporting the cover hook 45H. Remove from frame 52 . Thereby, the operator can remove the cover part 45 from the machine body. Also, the operator slides the cover portion 45 downward with respect to the support frame 52 and hooks the cover hooks 45H, 45H to the pair of engagement holes in the support frame 52 . After that, the operator swings the cover portion 45 toward the rear side of the machine body to engage the buckle 45B and the engaging portion 53 . Thereby, the operator can attach the cover part 45 to the machine body.

The body front end portion of the cover portion 45 is formed in a planar shape extending vertically, and this portion is referred to as a vertical surface portion 45 a of the cover portion 45 . A left inclined surface portion 45 c and a right inclined surface portion 45 d are formed in the lower portion of the cover portion 45 . Each of the left inclined surface portion 45c and the right inclined surface portion 45d is inclined so as to be positioned toward the rear side of the aircraft body as it goes downward in a side view of the aircraft body. The left slanted surface portion 45c is formed in a shape that rises to the left so as to be positioned higher toward the left side of the fuselage (the right side of the paper surface of FIG. 5) when viewed in the longitudinal direction of the fuselage. The right inclined surface portion 45d is formed in a shape rising to the right so as to be positioned higher toward the right side of the fuselage (the left side of the paper surface of FIG. 5) when viewed in the longitudinal direction of the fuselage. The left slanted surface portion 45c is slanted higher than the right slanted surface portion 45d. In this manner, the cover portion 45 is formed in a downwardly tapered shape so that the width thereof becomes narrower toward the lower side in the lateral direction of the machine body.

A plate-shaped lower wall portion 48 is provided across the left inclined surface portion 45 c and the right inclined surface portion 45 d and the front wall portion 41 . The lower wall portion 48 is formed in a V shape along the inclined shapes of the left inclined surface portion 45c and the right inclined surface portion 45d when viewed in the front-rear direction.

[Regarding the opening of the cover part]
As shown in FIGS. 5 to 7, an opening 60 is formed in the lower portion of the cover portion 45 that is tapered downward. An area indicated by L11 from the lower end of the left inclined surface portion 45c to the left side of the fuselage, and an area indicated by L12 from the lower end portion of the right inclined surface portion 45d to the right side of the fuselage are located above the front of the fuselage. , and this recessed portion is the opening 60 . Further, the area indicated by L11 and L12 of the lower wall portion 48, that is, the area below the rotor 43 is recessed rearward of the machine body, and this recessed portion is the opening 60. As shown in FIG. That is, the opening 60 is formed by the recessed portions of the left inclined surface portion 45 c and the right inclined surface portion 45 d 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 drop.

As described above, the cover portion 45 is tapered toward the bottom, and the opening 60 includes the lower end portion of the cover portion 45 . The opening 60 is formed in the central region in the width direction of the threshing device 6 in the lower portion of the cover portion 45 . Further, the opening 60 is formed in a portion of the lower portion of the cover portion 45 that is positioned below the existing range of the rotating body 43 .

As shown in FIG. 5, the opening 60 overlaps the lower portion of the rotating body 43 when viewed in the front-rear direction. Further, the opening 60 overlaps the rotating body 43 over a width larger than half of the lateral width of the rotating body 43 in the lateral direction of the machine body. The opening 60 is formed in a portion of the lower portion of the cover portion 45 that is adjacent to the belt 44 . Due to the configuration in which the opening 60 is formed below the rotating body 43 , dust and the like do not accumulate in the area below the rotating body 43 .

As shown in FIGS. 5 to 7, the opening 60 is provided with a grid-shaped restricting member 46 . The restricting member 46 restricts 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 bolted right above the opening 60 . The pressing member 47 is formed in a V shape along the inclined shapes of the left inclined surface portion 45c and the right inclined surface portion 45d when viewed in the front-rear direction. A welding bolt 47B is attached to the pressing member 47 . A plurality of through holes are formed in the lower edge portion of the vertical surface portion 45a, and the plurality of through holes in the lower edge portion of the vertical surface portion 45a are formed in positions corresponding to the welding bolts 47B.

As shown in FIG. 7, the restricting member 46 includes a base portion 46A and a main body portion 46B. As with the pressing member 47, the base portion 46A is formed in a V shape along the inclined shapes of the left inclined surface portion 45c and the right inclined surface portion 45d when viewed in the front-rear direction. The base portion 46A is supported by the lower edge portion of the vertical surface portion 45a, and the body portion 46B is positioned in the opening portion 60. As shown in FIG. The base portion 46A and the body portion 46B are welded to each other, and the body portion 46B extends downward from the base portion 46A. Further, the body portion 46B is formed in an L shape when viewed from the side of the body, and the extending end portion of the body portion 46B extends rearward of the body. The extending end of the main body portion 46B contacts the lower wall portion 48, and in this state, the extending end of the main body portion 46B is positioned below the lower wall portion 48. As shown in FIG.

The sheet member 49, the base portion 46A, and the pressing member 47 are fixed together to the lower portion of the cover portion 45 by welding bolts 47B and nuts Nu. The weld bolt 47B and the nut Nu are the "fastener" of the present invention.

A plurality of through holes are formed in the upper edge portion of the sheet member 49 as well as the plurality of through holes formed in the lower edge portion of the vertical surface portion 45a. The plurality of insertion holes in the sheet member 49 are drilled at positions corresponding to the welding bolts 47B and the plurality of insertion holes drilled in the lower edge portion of the vertical surface portion 45a. A plurality of insertion holes are formed in the base portion 46A. The through holes in the base portion 46A are drilled at positions corresponding to the welding bolts 47B and the plurality of through holes drilled in the lower edge portion of the vertical surface portion 45a.

The plurality of insertion holes in the sheet member 49, the plurality of insertion holes in the lower edge portion of the vertical surface portion 45a, and the insertion holes in the base portion 46A are superimposed in the front-rear direction, and the welding bolts 47B of the pressing member 47 are inserted into these holes. It is inserted through the insertion hole. After that, the weld bolt 47B is tightened by the nut Nu. In this state, the base portion 46A of the regulating member 46 is sandwiched between the lower portion of the vertical surface portion 45a and the nut Nu fastened to the welding bolt 47B of the pressing member 47. As shown in FIG. Also, the sheet member 49 is sandwiched between the pressing member 47 and the lower portion of the vertical surface portion 45a. The seat member 49 is positioned in front of the restricting member 46 .

The main body portion 46B covers the entire opening 60 while the base portion 46A is fastened and fixed to the vertical surface portion 45a. Since the main body portion 46B is configured in a lattice shape, the opening portion 60 is divided into a plurality of openings 60a by the main body portion 46B of the regulating member 46. As shown in FIG. As a result, each opening 60a formed in the gap of the main body 46B in the opening 60 becomes smaller, making it difficult for crops to enter the inner space of the cover 45 through the opening 60. As shown in FIG.

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

(1) In the above-described embodiment, the lower portion of the cover portion 45 is formed in a downwardly tapered shape by the left inclined surface portion 45c and the right inclined surface portion 45d, but is not limited to this embodiment. For example, as shown in FIG. 8, the lower portion of the cover portion 45 may be configured to incline laterally inward of the machine body (right side of the machine body, left side of the paper surface of FIG. 8) toward the lower side. In this case as well, the opening 60 is formed in a portion of the lower portion of the cover portion 45 that is positioned below the existence range of the rotating body 43 , and the opening portion 60 is configured to include the lower end portion of the cover portion 45 . ing. A regulating member 46 is provided in the opening 60 .

(2) In the above embodiment, the rotating body 43 and the cover part 45 are provided in front of the front wall part 41, but the present invention is not limited to this embodiment. For example, the rear end portion of the support shaft 19 of the threshing drum 12 penetrates the rear wall portion (not shown) of the threshing device 6, and the rotating body 43 is attached to the portion of the support shaft 19 on the rear side of the rear wall portion. and a belt 44 may be provided. A cover part 45 may be attached to the rear wall part of the threshing device 6 so as to cover the rotating body 43 and the belt 44 .

(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.

(4) In the above-described embodiment, the main body portion 46B of the restricting member 46 is configured in a lattice shape, but the main body portion 46B may be configured in a net shape (mesh shape), and the main body portion 46B may be made of punching metal. may be configured. In other words, the plurality of openings 60a may be formed in a mesh shape, or the plurality of openings 60a may be formed in a porous manner. Further, when the main body portion 46B is net-like (mesh-like), the net-like (mesh-like) may be formed with fine meshes, and when the main body portion 46B is punching metal, the punching metal may be formed with fine meshes. .

(5) In the above-described embodiment, the opening 60 is provided with one regulating member 46 , but the opening 60 may be provided with two or more regulating members 46 .

(6) In the above-described embodiment, the threshing device 6 is configured to thresh the tip-side portion of the reaping grain culms pinched and conveyed by the feed chain 7, but is not limited to this embodiment. For example, the threshing device 6 may be configured to throw all the harvested grain culms into the threshing chamber 13 .

(7) In the above embodiment, the elastically deformable sheet member 49 that covers the entrance portion 42 is provided in front of the restricting member 46, but the sheet member 49 may not be provided.

It should be noted that the configurations disclosed in the above-described embodiments (including other embodiments; the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments unless there is a contradiction. Moreover, the embodiments disclosed in this specification are merely examples, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the scope of the present invention.

INDUSTRIAL APPLICABILITY The present invention can be used for combine harvesters (for example, ordinary combine harvesters and self-threshing combine harvesters).

4: Reaping part 6: Threshing device 7: Feed chain 12: Handling cylinder 13: Handling chamber 19: Support shaft 41: Front wall part (wall part)
42: Inlet portion 43: Rotating body (driving portion)
44: belt (driving part)
45: cover portion 45o: opening portion 46: regulating member 46A: base portion 46B: body portion 47: pressing member 47B: welding bolt (fastener)
49: Sheet member Nu: Nut (fastener)

Claims (8)

a harvesting unit that harvests crops in a field and conveys them toward the rear of the machine;
a threshing device for threshing the crops harvested by the harvesting unit and for threshing the harvested crops;
The threshing device is provided with a threshing cylinder for threshing the crops by rotating and a threshing chamber for accommodating the threshing cylinder,
One front and rear end of the support shaft of the threshing cylinder penetrates through one front and rear wall of the threshing device and protrudes outside the device from the wall of the support shaft. A driving part for inputting power to the handling cylinder is provided in the part,
A cover portion attached to the wall portion is provided so as to cover the driving portion,
An opening is formed in the lower portion of the cover portion to allow foreign objects that have entered the space between the wall portion and the cover portion to drop ,
A combine harvester, wherein the opening is provided with a restricting member that restricts entry of foreign matter from the opening into the space . The combine according to claim 1, wherein the opening is formed in a central region in the width direction of the threshing device in the lower portion of the cover portion. The combine according to claim 1 or 2, wherein the opening is formed in a portion of the lower portion of the cover portion that is located below the existence range of the drive portion. The drive unit includes a power transmission belt and a rotating body around which the belt is wound,
The combine according to any one of claims 1 to 3, wherein the opening is formed in a portion of the lower portion of the cover portion that is adjacent to the belt. The cover portion is formed in a downward tapering shape so that the width becomes narrower toward the bottom,
The combine according to any one of claims 1 to 4, wherein the opening is configured to include the lower end of the cover. A feed chain is provided for conveying the crops from the reaping unit with the tips of the crops being put into the handling chamber,
The support shaft passes through the front wall portion of the threshing device, and the driving portion is provided in front of the front wall portion,
6. The front wall portion according to any one of claims 1 to 5, wherein an entrance portion to the chamber for the crops conveyed by the feed chain is formed in a lower region of the portion covered by the cover portion. A combine according to paragraph 1. The combine according to claim 6, wherein the opening is partitioned into a plurality of openings by the regulating member. A flexible sheet member that hangs down from the lower part of the cover part and covers the entrance part from the front, and a pressing member that presses and fixes the upper end part of the sheet member,
the regulating member includes a main body positioned in the opening and a base supported by a lower portion of the cover;
The combine according to claim 6 or 7, wherein the base portion and the pressing member are fastened and fixed together by a fastener to the lower portion of the cover portion.

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