combine

Abstract

To provide a combine that enables reaped crops to be taken into a supply and conveyance device smoothly by a raking auger, and enables the crops to be supplied to a threshing part without causing them to stagnate.SOLUTION: A combine includes a supply and conveyance device disposed in front of a threshing part and a raking auger disposed in front of the supply and conveyance device for raking crops into the supply and conveyance device. The raking auger includes a cylindrical auger body part 241 with a right and left direction as a rotation axis direction, a spiral blade part 242 disposed on an outer peripheral surface 241a of the auger body part 241, and a plurality of raking fingers 240 protruding from the outer peripheral surface 241a of the auger body part 241. A plurality of raking fingers 240 (a third finger 240c, a fifth finger 240e, a sixth finger 240f, and an eighth finger 240h) positioned in front of the supply and conveyance device out of the plurality of raking fingers 240, is disposed spirally along the spiral of the blade part 242.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to a combine harvester having a raking auger for raking cut crop into a feeding and conveying device. [Background technology]

[0002] Conventionally, there is a combine harvester equipped with a raking auger for raking the harvested crops into the supply conveying device in front of the supply conveying device that conveys the harvested crops by the harvesting unit and supplies them to the threshing unit. A configuration is known for the raking auger, which has a cylindrical auger body with the left-right direction as the rotation axis direction, a spiral blade portion provided on the outer circumferential surface of the auger body, and a plurality of rod-shaped raking fingers protruding from the outer circumferential surface of the auger body.

[0003] Regarding a configuration equipped with a raking auger, there is a row crop header, which is a harvesting device configured to send the harvested crop, culms, to the raking auger using a culm conveying device (see, for example, Patent Document 1). Patent Document 1 discloses a configuration in which raking fingers are provided within the width of the conveying path of the culm conveying device to improve the raking ability of the raking auger. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 63-71625 Summary of the Invention [Problem to be solved by the invention]

[0005] In the raking auger disclosed in Patent Document 1, a plurality of raking fingers for transferring the harvested stalks to the supplying and conveying device are provided on the auger body at a position forward of the entrance of the supplying and conveying device in the left-right direction. Specifically, a plurality of raking fingers are arranged side-by-side in the left-right direction, which is the axial direction of the auger body, and are provided in multiple sets at predetermined intervals around the circumferential direction of the auger body.

[0006] In this configuration, since the multiple raking fingers are arranged to have the same phase in the circumferential direction of the auger body, the harvested stalks tend to get entangled with the raking fingers in front of the entrance of the supplying and conveying device, which causes the stalks to be unable to be smoothly handed over to the supplying and conveying device, resulting in a problem that the stalks tend to stagnate and become clogged.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a combine harvester that can smoothly take in harvested crops into a supplying and conveying device using a shovel auger, and can supply the crops to the threshing section without causing them to stagnate. [Means for solving the problem]

[0008] The combine harvester of the present invention is a combine harvester equipped with a supplying and conveying device provided in front of the threshing section, and a raking auger provided in front of the supplying and conveying device for raking crops into the supplying and conveying device, wherein the raking auger has a cylindrical auger main body with the left-right direction as the rotational axis direction, a spiral blade portion provided on the outer peripheral surface of the auger main body, and a plurality of raking fingers protruding from the outer peripheral surface of the auger main body, and among the plurality of raking fingers, the plurality of raking fingers located in front of the supplying and conveying device are arranged in a spiral shape along the spiral of the blade portion.

[0009] A combine harvester according to another aspect of the present invention is the above-mentioned combine harvester, further comprising a plurality of stalk transport devices in front of the raking auger, which transport crops using a pair of transport bodies.

[0010] In another aspect of the combine of the present invention, in the combine, of the multiple stalk conveying devices, at least the stalk conveying device located in front of the supplying and conveying device is arranged so that the position of the conveying passage can be adjusted in the left-right direction, and at least one of the multiple stalk conveying fingers arranged in a spiral shape is located within the adjustment width of the conveying passage by adjusting the position of the stalk conveying device located in front of the supplying and conveying device.

[0011] In another aspect of the combine of the present invention, the raking auger has, as its blade portions, a first blade portion provided on one left or right side of a portion of the auger body in front of the supply and conveying device, and a second blade portion provided on the other left or right side of the portion of the auger body and formed over a shorter range in the left-right direction than the first blade portion, and the multiple raking fingers arranged in a spiral are arranged so that part of their left-right arrangement range overlaps with the left-right formation range of the second blade portion.

[0012] A combine harvester according to another aspect of the present invention is a combine harvester in which an intake port of the supplying and conveying device is provided with a guide member for guiding crops raked in by the raking auger to the supplying and conveying device. Effect of the Invention

[0013] According to the present invention, the harvested crops can be smoothly taken into the supplying and conveying device by the raking auger, and the crops can be supplied to the threshing section without stagnation. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a left side view of a combine harvester according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a right side view of a combine harvester according to one embodiment of the present invention. [Diagram 3] FIG. 1 is a plan view of a combine harvester according to one embodiment of the present invention. [Figure 4] FIG. 2 is a diagram showing a power transmission configuration in a combine harvester according to one embodiment of the present invention. [Diagram 5] FIG. 2 is a diagram showing a power transmission configuration of a cutting unit according to one embodiment of the present invention. [Figure 6] FIG. 2 is a front perspective view of a reaping unit according to one embodiment of the present invention. [Figure 7] FIG. 2 is a plan view of a reaping unit according to one embodiment of the present invention. [Figure 8] 1 is a left side view of a harvesting and conveying device according to one embodiment of the present invention. [Figure 9] FIG. 2 is a plan view of the raking auger according to one embodiment of the present invention. [Figure 10] FIG. 2 is a cross-sectional view of a raking auger according to one embodiment of the present invention. [Figure 11] FIG. 2 is a plan view showing the internal structure of the raking auger according to one embodiment of the present invention. [Figure 12] FIG. 2 is an exploded view of a raking auger, showing a schematic configuration of the raking auger according to one embodiment of the present invention. [Figure 13] FIG. 2 is a perspective view showing an inlet portion of a feeder according to one embodiment of the present invention. [Figure 14] FIG. 4 is a left side cross-sectional view showing a configuration of a guide member according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention aims to make it possible to efficiently supply the harvested crops from the harvesting section to the threshing section by improving the configuration of the harvesting auger for raking the harvested crops into the supplying and conveying device. Hereinafter, an embodiment of the present invention will be described.

[0016] The overall configuration of the combine harvester 1 according to this embodiment will be described with reference to Figures 1 to 8. In the following description, the left side (lower side in Figure 3) and the right side (upper side in Figure 3) facing the front of the combine harvester 1 are the left side and the right side of the combine harvester 1, respectively.

[0017] As shown in Figures 1 and 2, the combine harvester 1 according to this embodiment is a normal type combine harvester that rakes in harvested crops (rice, wheat, soybeans, corn, etc.) from a field into the machine body, threshes, sorts, stores the grains, and can be transported outside the machine as needed. The combine harvester 1 has a self-propelled traveling body 2 and a reaping unit 3 provided at the front end of the traveling body 2. The reaping unit 3 is configured as a reaping device that harvests and collects unharvested stalks of rice, wheat, etc., and is attached to the traveling body 2 so as to be able to rise and fall.

[0018] The traveling machine body 2 includes a traveling section 4 configured as a crawler-type traveling device having a pair of left and right crawler sections 5, 5. A machine body frame 6 is provided above and between the left and right crawler sections 5, 5. Each crawler section 5 has multiple rotating bodies including a driving sprocket 5a provided at its front end, and a track 5c wound around these rotating bodies. The driving sprocket 5a is driven to rotate by receiving power transmitted from an engine 25 provided in the combine harvester 1.

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

[0020] On the machine frame 6, to the right of the threshing section 7 and the sorting section 8, there is provided a grain storage section 9 having a grain tank 10 for storing grains (clean grains) sorted in the sorting section 8. A lower discharge conveyor 11 for transporting the stored grains toward the discharge port of the grain tank 10 is provided in the grain tank 10 (see FIG. 4). A vertical transport conveyor 12 is provided upright in the vertical direction so as to communicate with the discharge port of the grain tank 10. A grain discharge conveyor 13 is connected to the upper end of the vertical transport conveyor 12. The grain discharge conveyor 13 is provided so as to be rotatable in the horizontal direction and to be swingable up and down around a horizontal axis. The grains in the grain tank 10 are transported by these conveyors, and are discharged from a paddy inlet 14 provided at the tip of the grain discharge conveyor 13 into a truck bed, a container, or the like.

[0021] A driver's section 15, in which an operator sits, is provided on the machine frame 6 in front of the grain storage section 9, that is, at the front right side of the machine frame 6. The driver's section 15 is covered by a cabin 16. The driver's section 15 is provided with a driver's seat 17, a steering wheel 18 disposed in front of the driver's seat 17, and various operating sections such as a main speed change lever 19, a sub speed change lever, and a work clutch lever (see FIG. 2). The work clutch lever is a work operating tool for switching on and off the threshing clutch 57 and the reaping clutch 75 (see FIG. 4).

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

[0023] The following describes the reaping unit 3. The reaping unit 3 has a feeder 30 as a supply conveying device, a platform 31 as a grain header, and a reaping and conveying device 32 that harvests and conveys crops.

[0024] The reaping section 3 according to this embodiment is configured as a so-called row crop header, with a reaping conveying device 32 attached in front of a platform 31. The row crop header configuration is mainly used for harvesting beans such as soybeans and adzuki beans. In the combine harvester 1, instead of the row crop header, it is possible to attach a configuration including a platform, a cutting blade device, a grass dividing body, a raking reel, etc. to the feeder 30.

[0025] The feeder 30 transports the stalks harvested by the harvesting section 3 and supplies them to the threshing section 7. The feeder 30 has a feeder house 35 as a housing, and a conveyor 36 (see FIG. 4) for transporting the stalks provided within the feeder house 35. The feeder 30 is located to the left of the cabin 16, and is provided with a rear end opening of the feeder house 35, which is configured as a substantially rectangular cylinder with the longitudinal direction in a plan view as the front-rear direction, communicating with the front handling port 7a of the threshing section 7.

[0026] The conveyor 36 is a chain conveyor having chains 95 arranged parallel to each other on both the left and right sides inside the feeder house 35, and a number of slats 96 installed between the left and right chains 95. The slats 96 are installed on the outer periphery of the chains 95 at appropriate intervals in the extension direction of the chains 95. The slats 96 are elongated members whose longitudinal direction is the installation direction (left-right direction) between the left and right chains 95, and are bent plate-like members having a substantially U-shaped cross section (see FIG. 14). The slats 96 are fixed to the chains 95 by fasteners such as bolts.

[0027] The conveyor 36 has a reaping section input shaft (feeder house conveyor shaft) 38, which is provided at the front of the threshing section 7 and has an axial direction in the left-right direction, as a drive shaft supporting the feeding end side of the conveyor 36. The conveyor 36 has a rear portion of a chain 95 wound around a sprocket 97 fixed to the reaping section input shaft 38. Meanwhile, the front portion of the chain 95 is wound around a cylindrical front drum 98 provided at the front end inside the feeder house 35.

[0028] The front drum 98 is rotatably supported around a conveyor driven shaft 98a, which is a rotating shaft supported between the left and right side portions of the feeder house 35. In other words, the chain 95 is endlessly wound around the sprocket 97 and the front drum 98, and the rotation of the sprocket 97 accompanying the rotation of the reaping unit input shaft 38 drives the chain 95 to move the slats 96 while maintaining the wound state.

[0029] The rear end of the feeder 30 is supported rotatably with respect to the traveling machine body 2 side, with the cutting unit input shaft 38 as a rotation shaft. In addition, a lifting cylinder 39, which is a hydraulic cylinder, is interposed between the lower surface of the feeder house 35 and the machine body frame 6.

[0030] The reaping unit 3 is provided so as to be raised and lowered by the rotation of the feeder 30 relative to the traveling body 2 accompanying the extension and contraction of the lifting cylinder 39. The height of the reaping unit 3 is adjusted by the lifting and lowering movement of the reaping unit 3. The lifting and lowering movement of the reaping unit 3 is operated by a predetermined operating unit provided in the driving unit 15.

[0031] The platform 31 is configured in a horizontally elongated bucket shape, and is connected to the front side of the feeder 30 so as to communicate with the front end opening of the feeder house 35. The platform 31 has a left side wall portion 201, a right side wall portion 202, a rear wall portion 203, and a bottom portion 204, and forms a space with the front and upper sides open as a space for inputting the grain straw.

[0032] The rear wall 203 has a horizontal frame 203a formed of a square pipe-shaped member and constituting the upper edge of the rear wall 203, and a rear wall surface 203b provided below the horizontal frame 203a. An intake port 205 is formed in the rear wall 203, facing the front end opening of the feeder house 35 (see FIG. 6). The intake port 205 has a rectangular opening shape corresponding to the shape of the front end opening of the feeder house 35.

[0033] The feeder house 35 is provided on the platform 31 at a position slightly to the left of the center in the left-right direction, and the inlet 205 opens into the platform 31 at a position slightly to the left of the center in the left-right direction. In detail, the inlet 205 is provided so as to open an area substantially the same as the second-left area of ​​the rear wall portion 203 divided into four equal parts in the left-right direction.

[0034] A scooping auger (platform auger) 37 is provided within the platform 31. The scooping auger 37 is axially mounted between the left side wall portion 201 and the right side wall portion 202 of the platform 31 so as to be rotatable with the left-right direction as the rotation axis direction. The scooping auger 37 has both left and right ends pivotally supported by the left side wall portion 201 and the right side wall portion 202, respectively.

[0035] The harvesting and conveying device 32 has a plurality of configurations of combinations of the stalk conveying device 33 and the harvesting device 34. The stalk conveying device 33 and the harvesting device 34 are supported by a predetermined harvesting unit frame 210 that constitutes the harvesting and conveying device 32. The harvesting unit frame 210 is formed as a framework by predetermined frame members, and is the part that is fixed to the front side of the platform 31 in the harvesting and conveying device 32.

[0036] In this embodiment, the reaping and conveying device 32 has four sets of stalk conveying devices 33 and reaping devices 34 arranged in parallel on the left and right corresponding to the four consecutive rows in the left-right direction, forming a four-row reaping section 3. In other words, the reaping and conveying device 32 has four row crop units, with the combination of the stalk conveying devices 33 and the reaping devices 34 being one row crop unit 200 (see FIG. 5).

[0037] The stalk conveying device 33 is provided with a pair of belt conveyors 220 on the left and right as conveyors, and is configured to convey the stalks by positioning them between the left and right belt conveyors 220. In other words, the space between the left and right belt conveyors 220 forms a conveying passage 215 for the stalks. The belt conveyor 220 has a configuration in which a conveying belt 222, which is an endless rotating belt, is arranged along a longitudinal conveying case 221 arranged such that the longitudinal direction is the front-rear direction in a plan view.

[0038] The pair of belt conveyors 220 are fixed to a predetermined portion of the harvesting unit frame 210. The pair of belt conveyors 220 are provided in a manner that is inclined downward toward the front from a position diagonally above and in front of the raking auger 37. The inclination angle of the belt conveyors 220 with respect to the horizontal direction is, for example, about 45°.

[0039] In each belt conveyor 220, the conveyor belt 222 is wound around a driving pulley 223, which is a driving wheel provided at the rear side, which is the downstream side of the conveyor, and a driven pulley 224, which is a driven wheel provided at the front side, which is the upstream side of the conveyor. In the conveyor belt 222, a plurality of tines 222a are formed so as to protrude to the outer periphery at a predetermined interval in the circumferential direction. In the belt conveyor 220, the conveyor belt 222 is provided so that the tines 222a protrude from the conveyor case 221 to the conveying path side of the stalk conveying device 33.

[0040] The pair of conveyor belts 222 clamp the culms with the opposing tines 222a, and rotate in a direction that moves the opposing sides in the conveying direction of the culms by the rotational drive of the drive pulley 223. The drive pulley 223 and the driven pulley 224 have a rotation axis direction that is perpendicular to the inclination of the belt conveyor 220 when viewed from the side of the machine body. The drive pulley 223 is driven to rotate by power transmitted from the engine 25 via a predetermined transmission mechanism. In addition, a tension pulley or the like is provided for the conveyor belt 222 in the belt conveyor 220. As described above, the combine harvester 1 is provided with a plurality (four) of culm conveying devices 33 that convey crops by the pair of belt conveyors 220 in front of the raking auger 37.

[0041] The reaping device 34 has a reaping transmission case 225 fixed to a predetermined portion of the reaping unit frame 210 , and a rotary blade 227 attached to a blade drive shaft 226 protruding from the reaping transmission case 225 .

[0042] The cutting transmission case 225 is provided below the pair of belt conveyors 220. The cutting transmission case 225 has an arm-shaped inclined case portion that is inclined downward toward the front so as to follow the inclination of the belt conveyor 220, and a cutting blade drive shaft 226 protrudes upward from the front end of the inclined case portion. The rotary blade 227 is located behind the conveyance start end (front end) of the pair of belt conveyors 220. A transmission mechanism (rotary blade transmission mechanism 88 in FIG. 5) is provided inside the cutting transmission case 225 for transmitting power transmitted from the engine 25 to the cutting blade drive shaft 226.

[0043] In the reaping and conveying device 32, a divider 228 is provided in front of each belt conveying body 220 as a grass dividing body. The divider 228 is provided in a state supported by a rod-shaped divider support arm 229 that extends forward from a predetermined portion of the reaping unit frame 210. The divider support arm 229 extends forward from the left and right outer sides of the pair of belt conveying bodies 220, and the front end is located in front of the belt conveying body 220. The divider 228 has a support plate portion provided at the front end of the divider support arm 229 with an acute angle on the front side, and multiple (three) rod-shaped portions provided from the support plate portion to the rear so as to widen the gap between them.

[0044] Side dividers 230 are provided on both the left and right outer sides of the reaping conveying device 32. The side dividers 230 are formed of straight rod-shaped members, and are provided so as to be gradually inclined from the left and right inner side to the left and right outer side from the front to the rear in a plan view, and are provided so as to be inclined downward toward the front in a side view. The inclination of the side dividers 230 in a side view is gentler than the inclination of the belt conveying body 220.

[0045] The front end of the side divider 230 is supported by the front end of the divider support arm 229 located on the outermost left and right sides. Also, the middle part of the side divider 230 in the extension direction is supported by the divider support arm 229 located on the outermost left and right sides via a support plate 231.

[0046] In addition, the reaping conveying device 32 is provided with gauge wheels 234 on both the left and right sides. The left and right gauge wheels 234 are ground contact wheels that determine the height of the front end of the reaping unit 3 from the ground, and allow the traveling body 2 to travel along the ridges while in contact with the left and right sides of the ridges. The gauge wheels 234 are provided at a position between the two stalk conveying devices 33 on the left side and a position between the two stalk conveying devices 33 on the right side in the left-right direction. The gauge wheels 234 are located forward of the belt conveying body 220 and rearward of the front end of the divider 228 in the front-rear direction.

[0047] The gauge wheel 234 is rotatably supported by a gauge wheel support arm 235 extending forward from a predetermined portion of the reaping unit frame 210. The gauge wheel 234 is provided so as to be adjustable in height by an adjustment mechanism provided on the gauge wheel support arm 235.

[0048] In the reaping and conveying device 32, among the multiple (four) stalk conveying devices 33, the three stalk conveying devices 33 on the left side are provided so that the position of the conveying passage 215 can be adjusted in the left-right direction. In other words, the three stalk conveying devices 33 on the left side are provided so that their positions can be adjusted in the left-right direction. In this embodiment, among the row crop units 200 including the stalk conveying devices 33 and the reaping device 34, the three row crop units 200 on the left side are provided so that their positions can be adjusted in the left-right direction.

[0049] As shown in FIG. 7, the row spacing dimension T1 in the harvesting and conveying device 32 is adjusted by adjusting the left and right position of the stalk conveying device 33. The row spacing dimension T1 is the left and right distance between the conveying lines T0 of adjacent stalk conveying devices 33. The conveying line T0 is the left and right central position of the conveying passage 215 between the pair of left and right conveying belts 222 in each stalk conveying device 33. In other words, the row spacing dimension T1 is adjusted by adjusting the left and right position of the conveying line T0 of each stalk conveying device 33. In the structure for adjusting the row spacing dimension T1, the rightmost stalk conveying device 33 (row crop unit 200) is the reference unit and is fixed to the reaping unit frame 210.

[0050] The row crop unit 200 has a frame section that supports the stalk transport device 33 and the harvesting device 34. The three row crop units 200 on the left side have their frame sections attached to the harvesting unit frame 210 so that their positions can be adjusted in the left-right direction by a known position adjustment mechanism. The position adjustment mechanism is a structure in which holes for passing bolts as fasteners through the fixing parts of the frame sections of the row crop units 200 to the harvesting unit frame 210 are elongated holes with the left-right direction as the longitudinal direction.

[0051] With this type of position adjustment mechanism, with the bolts loosened, the row crop unit 200 is slid left and right within the length of the long hole to adjust its position, and then the bolts are tightened to fix the row crop unit 200 in place. For example, with respect to the right-most row crop unit 200 which serves as the reference, the left and right positions of the second, third, and fourth row crop units 200 from the right are adjusted in that order, and the row-to-row spacing dimension T1 is adjusted successively from the right side. The adjustment range of the row-to-row spacing dimension T1 is, for example, about 100 mm.

[0052] A front rotor 26 is provided behind the feeder 30 to send the stalks transported by the conveyor 36 to the threshing opening 7a. The front rotor 26 is provided between the end of the conveyor 36 and the threshing opening 7a. The front rotor 26 has a roughly cylindrical rotor body called a beater or the like, and a front rotor shaft 28 (see FIG. 4) whose axial direction is in the left-right direction. The stalks transported by the feeder 30 are fed from the end of the conveyor 36 to the threshing opening 7a and into the threshing chamber 7b of the threshing section 7 by the front rotor 26.

[0053] The threshing section 7 and the sorting section 8 will now be described. The threshing section 7 has a threshing drum 40 provided in a threshing chamber 7b with a threshing mouth 7a opening to the front, and a receiving net 42 disposed below the threshing drum 40. The threshing chamber 7b is formed by a machine frame provided on the machine frame 6.

[0054] The threshing drum 40 is rotatably supported by a threshing drum shaft 41 (see FIG. 4) whose axial direction is in the front-to-rear direction. The threshing drum 40 has a cylindrical main body with the threshing drum shaft 41 aligned along its central axis, and rod-shaped threshing teeth are provided on the outer circumferential surface of the main body. A number of angle-adjustable dust-transport valves are provided on the upper side of the threshing drum 40 to adjust the conveying speed (retention time) of the degrain in the threshing chamber. The receiving net 42 allows the grains to drop, and is provided along the outer circumferential surface of the lower part of the threshing drum 40.

[0055] The sorting section 8 has a swaying sorting plate 43 as a swinging section arranged below the receiving net 42, a swinging mechanism 44 including a swinging shaft 44a that swings the swaying sorting plate 43 by rotational power from a drive source, a first conveyor 45, a second conveyor 46, and a winnower 47 (see FIG. 4). As shown in FIG. 4, a pre-fan 71 is provided in front of the winnower 47, and a second fan 72 is provided behind the winnower 47.

[0056] The oscillating sorting plate 43 has components for gravity sorting, such as a feed pan, a chaff sieve arranged behind the feed pan to adjust the amount of grain leakage, and a grain sieve arranged below the chaff sieve. The first conveyor 45 is arranged in a first trough extending in the width direction of the machine so as to collect the first grains. The second conveyor 46 is arranged in a second trough extending in the width direction of the machine at a position behind the first conveyor 45 so as to collect the second grains. The winnower 47 blows sorting air from the front lower to the rear upper to the oscillating sorting plate 43.

[0057] A return conveyor 48 is provided on the right side of the machine body where the threshing section 7 and sorting section 8 are located (see FIG. 4). The return conveyor 48 is connected to the second conveyor 46 with its lower end located near the second conveyor 46, and its upper end is located near the front end of the handling drum 40, extending in an upward sloping manner. A grain lifting conveyor 49 is provided to the right of the return conveyor 48, extending in the vertical direction. The grain lifting conveyor 49 transports the first grain sent by the first conveyor 45 into the grain tank 10.

[0058] The combine harvester 1 having the above-mentioned configuration raises the harvesting unit 3 to a desired height above the ground (the harvest height of the culms, which are the harvested crop) in a field by raising and lowering the feeder 30 with the harvesting unit input shaft 38 as the center (support shaft), changes from a non-working state to a working state, and travels in this state using the traveling body 2. As a result, the combine harvester 1 separates the harvested crop into those to be harvested and those not to be harvested using the divider 228 and the side divider 230, and harvests the culms to be harvested using the harvesting device 34 while taking in the culms to be harvested using the culm transport device 33.

[0059] The culms harvested by the harvesting device 34 are transported rearward by the feeding action of the tines 222a of the conveyor belt 222 in the culm transporting device 33, and are raked into the platform 31 by the rotating raking auger 37 from the rear end of the culm transporting device 33. The culms raked into the platform 31 are collected near the intake port 205 in the platform 31 by the feeding action of the raking auger 37, and are taken into the feeder house 35 from the intake port 205. The culms taken into the feeder house 35 are transported by the conveyor 36 through the feeder house 35, and are thrown into the threshing port 7a by the front rotor 26, and are supplied to the threshing section 7.

[0060] The pod-bearing portions of the stalks supplied to the threshing section 7 are threshed by the threshing section 7. Specifically, the stalks supplied to the threshing section 7 are transported rearward by the rotating threshing drum 40 and threshed mainly between the threshing drum 40 and the receiving net 42. Grains and other threshed particles that are smaller than the mesh size of the receiving net 42 leak through the receiving net 42. Straw chips and other particles that do not leak through the receiving net 42 are discharged into the field from a dust outlet provided at the rear of the sorting section 8 by the transporting action of the threshing drum 40.

[0061] Meanwhile, the grains that have been threshed in the threshing section 7 and that have fallen through the receiving net 42 are sorted by the sorting section 8. Specifically, the threshed grains that have been threshed in the threshing drum 40 and that have fallen through the receiving net 42 are sorted by the gravity sorting action of the oscillating sorting plate 43 and the wind sorting action of the winnowing machine 47 into refined grains and other grains (first grains), a mixture of grains, such as grains with stalks, and straw (second grains), and straw chips, etc., and are removed.

[0062] The first grains that fall from the oscillating sorting plate 43 after sorting in the sorting section 8 are transported to the grain tank 10 by the first conveyor 45 and the connected grain lifting conveyor 49. The second grains are returned to the threshing start end of the threshing drum 40 by the second conveyor 46 and the connected return conveyor 48, and are threshed again. Straw chips and the like are discharged into the field from a dust outlet provided at the rear of the sorting section 8.

[0063] Next, the power transmission configuration of the combine harvester 1 according to this embodiment will be described with reference to Figures 4 and 5. The combine harvester 1 drives the reaping unit 3, the traveling unit 4, the threshing unit 7, the sorting unit 8, and the grain storage unit 9 by the rotational power of the engine 25.

[0064] As shown in Fig. 4, the engine 25 has a first output shaft 25a and a second output shaft 25b. The rotational power of the first output shaft 25a is transmitted to the traveling section 4, the threshing section 7, the sorting section 8, and the reaping section 3. The rotational power of the second output shaft 25b is transmitted to the grain storage section 9. The rotational power of the second output shaft 25b is transmitted to a fan shaft of a cooling fan 25d provided for the engine 25. The engine 25 also has a work implement pump shaft that drives a charge pump 54 that operates the lifting cylinder 39 and the like.

[0065] With regard to the power transmission system to the traveling unit 4, the rotational power of the first output shaft 25a is transmitted to the HST input shaft 52 by the first belt transmission mechanism 51 and input to the transmission 53 including the traveling HST and the turning HST. Here, "HST" refers to a hydraulic continuously variable transmission that employs a system in which hydraulic pressure generated by driving a hydraulic pump is converted back into rotational power by a hydraulic motor. The driving force of the transmission 53 rotates and drives the drive sprocket 5a of the crawler unit 5 constituting the traveling unit 4.

[0066] With regard to the power transmission system to the threshing unit 7, the rotational power of the first output shaft 25a is transmitted to the threshing unit input shaft 56 by a second belt transmission mechanism 55. The second belt transmission mechanism 55 is provided with a threshing clutch 57 that transmits the rotational power of the first output shaft 25a to the threshing unit input shaft 56 intermittently as desired.

[0067] The rotational power of the threshing section input shaft 56 is transmitted to the threshing drum input shaft 59 by a third belt transmission mechanism 58. The rotational power of the threshing drum input shaft 59 is transmitted to the threshing drum shaft 41 via a threshing speed change device 60. The threshing speed change device 60 changes the speed of the rotational power input from the threshing drum input shaft 59 to the threshing drum shaft 41, for example, between two stages, high speed and low speed.

[0068] With this configuration, the driving force of the engine 25 is transmitted to the threshing unit 7. Then, by operating the work clutch lever provided on the driving unit 15, the threshing clutch 57 is turned ON / OFF, and the power transmission to the threshing unit 7 is interrupted.

[0069] With regard to the power transmission system to the sorting section 8, the threshing section input shaft 56 has a support shaft portion for the winnower 47, and the rotational power of the threshing section input shaft 56 is transmitted to a pulley rotor 63 journaled on a threshing intermediate shaft 62 by a fourth belt transmission mechanism 61. The rotational power of the pulley rotor 63 is transmitted to the pre-fan 71 and the winnower 47 by a predetermined transmission mechanism. In addition, the rotational power of the threshing section input shaft 56 is transmitted to the first conveyor shaft 45a which rotates the first conveyor 45, the second fan shaft 72a which rotates the second fan 72, and the second conveyor shaft 46a which rotates the second conveyor 46 by a predetermined transmission mechanism.

[0070] The rotational power of the first conveyor shaft 45a is transmitted to the lifting conveyor 49 by a predetermined transmission mechanism. The rotational power of the second conveyor shaft 46a is transmitted to the swing shaft 44a of the swing mechanism 44 by a fifth belt transmission mechanism 64. The rotational power of the second conveyor shaft 46a is transmitted to the return conveyor 48 via a bevel gear.

[0071] With regard to the power transmission system to the grain storage section 9, the rotational power of the second output shaft 25b is transmitted to the rotating shaft 11a of the lower discharge conveyor 11 by a power transmission mechanism including a grain tank intermediate shaft 77, and the rotational power of the rotating shaft 11a is transmitted to the rotating shaft 12a of the vertical transport conveyor 12 via a bevel gear. The rotational power of the rotating shaft 12a is transmitted to the rotating shaft 13a of the grain discharge conveyor 13 by a predetermined transmission mechanism. The grain storage section 9 is provided with a suction fan 78 having a suction fan shaft 78a and a compressor 79 having a compressor shaft 79a, as a configuration that receives and drives the rotational power transmitted from the grain tank intermediate shaft 77.

[0072] With regard to the power transmission system to the reaping unit 3, the rotational power of the pulley rotor 63 is transmitted to the front rotor shaft 28 by a sixth belt transmission mechanism 73. The sixth belt transmission mechanism 73 is provided with a reaping clutch 75 that optionally transmits the rotational power of the pulley rotor 63 to the front rotor shaft 28 on and off. The rotational power of the front rotor shaft 28 is transmitted to the reaping unit input shaft 38 by a first chain transmission mechanism 65. The conveyor 36 in the feeder house 35 is operated by the rotational drive of the reaping unit input shaft 38.

[0073] As shown in Fig. 5, the rotational power of the cutting unit input shaft 38 is transmitted to a PF (platform) drive shaft 67 by a second chain transmission mechanism 66. The rotational power of the PF drive shaft 67 is transmitted to the PF auger shaft 37a that rotates the raking auger 37 via a third chain transmission mechanism 68. In addition, the rotational power of the PF drive shaft 67 is transmitted to a conveyor counter shaft 70 via a seventh belt transmission mechanism 69, and the rotational power of the conveyor counter shaft 70 is transmitted to the conveyor input shaft 76 via a fourth chain transmission mechanism 74.

[0074] The rotational power of the conveying input shaft 76 is transmitted by a bevel gear or the like to a conveying drive shaft 80 that drives each of a pair of belt conveyors 220 constituting the stalk conveying device 33 in each of the four row crop units 200. The rotational power of each conveying drive shaft 80 is transmitted to a drive pulley 223 by a fifth chain transmission mechanism 81, respectively, to rotate and drive the conveying belt 222.

[0075] Meanwhile, the rotational power of the PF drive shaft 67 is transmitted to the cutting counter shaft 83 via a sixth chain transmission mechanism 82, and the rotational power of the cutting counter shaft 83 is transmitted to the cutting input shaft 85 via an eighth belt transmission mechanism 84. The rotational power of the cutting input shaft 85 is transmitted to a cutting drive shaft 87 journalled on the conveyor input shaft 76 by a transmission gear 86 provided on the cutting input shaft 85. The rotational power of the cutting drive shaft 87 is changed in speed by a rotary blade transmission mechanism 88 constituted by various gears and rotary shafts supporting these gears, and transmitted to the cutting blade drive shaft 226.

[0076] With this configuration, the driving force of the engine 25 is transmitted to the cutting unit 3. Then, by operating a work clutch lever provided on the driving unit 15, a cutting clutch 75 (see FIG. 4) is turned on / off, thereby connecting and disconnecting the power transmission to the cutting unit 3. Note that, for convenience, FIG. 5 shows the power transmission configuration for only one row crop unit 200, but the other three row crop units 200 also have the same power transmission configuration as the configuration shown in FIG. 5.

[0077] As described above, the combine harvester 1 includes the feeder 30 provided in front of the threshing section 7, and the raking auger 37 provided in front of the feeder 30 for raking the crop into the feeder 30. The raking auger 37 and its surrounding structure will be described below with reference to Figs. 9 to 14.

[0078] Fig. 10 is a cross-sectional view taken along the line AA in Fig. 9. Fig. 12 is a development of the sweeping auger 37 in the circumferential direction of the peripheral wall 243, and is a diagram showing each component of the sweeping auger 37. In Fig. 12, the longitudinal direction (left-right direction) of the rectangular shape showing the outline of the development corresponds to the length of the auger main body 241, and the lateral direction (up-down direction) of the rectangular shape corresponds to an angular range of 360° in the circumferential direction of the auger main body 241.

[0079] As shown in Figures 9 and 10, the sweeping auger 37 has a cylindrical auger main body 241 whose rotation axis direction is the left-right direction of the body, a spiral blade portion 242 (242L, 242R) provided on the outer peripheral surface 241a of the auger main body 241, and a plurality of sweeping fingers 240 protruding from the outer peripheral surface 241a of the auger main body 241.

[0080] The raking auger 37 has a rotation axis C1 that is a left-right axis that coincides with the central axis of the cylindrical shape of the auger body 241. The raking auger 37 rotates counterclockwise when viewed from the left side (see arrow F1 in FIG. 10), and the blades 242 provide a feeding action to the stalks fed into the platform 31, sending the stalks to the inlet 205 (see FIG. 6).

[0081] The auger main body 241 has an outer diameter that fits into the space within the platform 31. The auger main body 241 has a length that is approximately the same as the dimension between the left side wall 201 and the right side wall 202 of the platform 31, and is provided so as to cover approximately the entirety of the inside of the platform 31 in the left-right direction. The auger main body 241 has a peripheral wall 243 that forms an outer circumferential surface 241a, and a left end surface 244 and a right end surface 245 that are both perpendicular to the rotation axis C1, and these surfaces form a cylindrical space and form a hollow portion.

[0082] The blade portion 242 is a plate-like portion having a spiral shape centered on the rotation axis C1 along the outer circumferential surface 241a of the auger body 241. The blade portion 242 is provided by fixing a plate-like member having a spiral shape to the outer circumferential surface 241a of the auger body 241 by welding or the like. Approximately triangular rib plates 246 are provided at appropriate intervals on the blade portion 242 as reinforcing members for reinforcing the support strength of the outer circumferential surface 241a.

[0083] The scraping auger 37 has, as the blade portion 242, a right blade portion 242R as a first blade portion provided on the right side of the auger body portion 241, and a left blade portion 242L as a second blade portion provided on the left side of the auger body portion 241.

[0084] The left blade 242L and the right blade 242R are each provided to integrally form a continuous spiral shape. The right blade 242R is provided over a range of more than half (approximately 3 / 5) of the entire length of the auger main body 241 from the right end of the auger main body 241 in the left-right direction. The left blade 242L is provided over a range of approximately 1 / 3 of the entire length of the auger main body 241 from the left end of the auger main body 241 in the left-right direction.

[0085] 9, the raking auger 37 is divided into three regions in the left-right direction: a right blade portion forming region D1, which is the region where the right blade portion 242R is formed; a left blade portion forming region D2, which is the region where the left blade portion 242L is formed; and a blade portion non-forming region D0, which is the region between these regions and is the region where the blade portion 242 is not formed. The blade portion non-forming region D0 is included within the range of the opening range E1 of the inlet 205 of the feeder 30 in the left-right direction, and is located in the middle of the opening range E1. In other words, the portion of the raking auger 37 that is the blade portion non-forming region D0 is located in front of the inlet 205.

[0086] The right wing portion 242R and the left wing portion 242L have a substantially constant protruding height from the outer circumferential surface 241a and are provided at a substantially constant pitch. In this embodiment, the number of turns of the right wing portion 242R is approximately 3, and the number of turns of the left wing portion 242L is approximately 1.5. However, the number of turns and pitch of each wing portion are not particularly limited.

[0087] As described above, the raking auger 37 has, as the blades 242, a right blade 242R provided on the right side of the portion of the auger body 241 in front of the feeder 30 (hereinafter referred to as the "feeder front portion"), and a left blade 242L provided on the left side of the portion of the auger body 241 in front of the feeder. The left blade 242L is formed in a range shorter in the left-right direction than the right blade 242R. Such an asymmetrical configuration of the left and right blades 242 corresponds to the arrangement of the feeder 30 on the left side of the platform 31. The feeder front portion of the auger body 241 is a portion corresponding to the opening range E1 of the inlet 205 of the feeder 30 in the left-right direction.

[0088] In this configuration, when the raking auger 37 rotates counterclockwise as viewed from the left side (see arrow F1 in FIG. 10), the right blade 242R and the left blade 242L laterally transport the stumps fed into the platform 31 toward the inlet 205. That is, the right blade 242R transports the stumps fed into the right side of the platform 31 toward the left side, which is the blade non-forming area D0 side, and the left blade 242L transports the stumps fed into the left side of the platform 31 toward the right side, which is the blade non-forming area D0 side.

[0089] The sweeping finger 240 is formed of a straight rod-shaped member, and is provided so as to penetrate the peripheral wall portion 243 of the auger body portion 241 and protrude from the outer circumferential surface 241a. A resin slide bush 247 is provided at the penetration portion of the peripheral wall portion 243 of the sweeping finger 240. The slide bush 247 has a through hole through which the sweeping finger 240 penetrates, and is attached to the peripheral wall portion 243 by a fastener such as a bolt. The sweeping finger 240 is supported by the slide bush 247 while penetrating the slide bush 247.

[0090] 11, the sweeping finger 240 is supported via a support boss 251 so as to be rotatable relative to a finger support shaft 250 (250A, 250B) provided in the auger main body 241. As shown in FIGS. 10 and 11, the support boss 251 has a cylindrical shaft support portion 251a through which the finger support shaft 250 passes, and a finger support portion 251b into which the base end of the sweeping finger 240 is fastened and fixed in a screwed state.

[0091] The finger support shaft 250 is a straight rod-shaped shaft with its axial direction extending in the left-right direction, and is an eccentric shaft with its axis C2 located at a position eccentric to the rotation axis C1 of the sweeping auger 37. The axis C2 of the finger support shaft 250 is located forward and below the rotation axis C1 of the sweeping auger 37 (see FIG. 10). The finger support shaft 250 is a fixed shaft whose position relative to the rotation axis C1 is constant.

[0092] The sweeping finger 240 extends radially outward from the finger support shaft 250 along the radial direction of a circumferential shape centered on the axis C2 when viewed in the axial direction of the axis C2. The sweeping finger 240 has a base end supported by the finger support shaft 250 via a support boss 251, and a tip end penetrating a slide bush 247. The sweeping finger 240 is provided in such a manner that it is bridged between the finger support shaft 250 and the peripheral wall portion 243.

[0093] Due to the eccentric structure of the finger support shaft 250, the rake-in finger 240 is configured to protrude and retract from the peripheral wall portion 243 in accordance with the rotation of the rake-in auger 37 about the rotation axis C1. When the rake-in finger 240 protrudes and retracts from the peripheral wall portion 243, the through hole of the slide bush 247 serves as a support hole that allows the rake-in finger 240 to slide.

[0094] That is, the sweeping finger 240, which is rotatably supported by the support boss 251 with respect to the finger support shaft 250 and supported by the peripheral wall portion 243 via the slide bush 247, rotates together with the peripheral wall portion 243 about the axis C2, and protrudes from and retracts from the peripheral wall portion 243. When viewed in the axial direction of the rotation axis C1, the amount of protrusion of the sweeping finger 240 from the peripheral wall portion 243 (hereinafter referred to as the "finger protrusion amount") is maximum at the front position among the positions along the straight line connecting the rotation axis C1 and the axis C2 in which the extension direction of the sweeping finger 240 is located, and is minimum at the rear position, which is in the opposite phase, of the positions in the circumferential direction centered on the rotation axis C1.

[0095] In the example shown in Fig. 10, the position of the rake finger 240 facing downward and forward with respect to the position of the axis C2 is the position where the finger protrusion amount is maximum, and the opposite position, i.e., the position of the rake finger 240 facing upward and rearward with respect to the position of the axis C2 is the position where the finger protrusion amount is minimum. The maximum finger protrusion amount is about 3 / 4 of the total length of the rake finger 240. With the finger protrusion amount at a minimum, the rake finger 240 is positioned with its tip within the through hole of the slide bush 247. In Fig. 10, the trajectory S1 of the tip of the rake finger 240 is indicated by a two-dot chain line.

[0096] As shown in Figure 11, the pick-up auger 37 is supported rotatably around a rotation axis C1 between the right side wall portion 202 and the left side wall portion 201 of the platform 31 by a rotating support shaft 261 that supports the right side of the pick-up auger 37 and a fixed support shaft 262 that supports the left side of the pick-up auger 37.

[0097] The rotation support shaft 261 is provided at the right end of the scraping auger 37 so that its axis coincides with the rotation axis C1, and its right end protrudes rightward from the right end surface 245 of the auger body 241. The rotation support shaft 261 is fixed to the right end surface 245 via a mounting plate 263. The mounting plate 263 is a plate-like member through which the rotation support shaft 261 passes and which is fixed to the rotation support shaft 261, and is fixed to the left and right outer sides (right side) of the right end surface 245 by fasteners such as bolts.

[0098] The rotation support shaft 261 penetrates a first intermediate support plate 265 provided to the left of the right end surface portion 245. The first intermediate support plate 265 is a plate-shaped portion perpendicular to the rotation axis C1, and is fixed to the peripheral wall portion 243. The rotation support shaft 261 is fixed to the first intermediate support plate 265 via an attachment plate 266. The attachment plate 266 is a plate-shaped member through which the rotation support shaft 261 penetrates and which is fixed to the rotation support shaft 261, and is fixed to the left and right outer sides (right side) of the first intermediate support plate 265 by fasteners such as bolts. In this way, the rotation support shaft 261 becomes a part that rotates integrally with the auger main body portion 241 by being fixed to the right end surface portion 245 and the first intermediate support plate 265.

[0099] The right end of the rotating support shaft 261 is rotatably supported by the right side wall portion 202 via a mounting plate 267 and a bearing member 268 such as a bearing. The mounting plate 267 is a plate-shaped member that rotatably supports the rotating support shaft 261 via the bearing member 268, and is fixed to the outside (right side) of the right side wall portion 202 by a fastener such as a bolt. A disk-shaped winding prevention plate 269 is provided on the inside (left side) of the right side wall portion 202 so as to close the opening edge on the right side of the peripheral wall portion 243. The winding prevention plate 269 is fastened and fixed to the right side wall portion 202 together with the mounting plate 267 by a fastener. A sprocket 259 constituting the third chain transmission mechanism 68 is fixed to the right protruding portion of the rotating support shaft 261 from the right side wall portion 202.

[0100] A base end of a first connecting arm 271 is supported so as to be rotatable relative to the left end of the rotating support shaft 261 that penetrates the first intermediate support plate 265. The first connecting arm 271 is provided so as to be perpendicular to the axial direction of the rotating support shaft 261, and a right end of a first finger support shaft 250A located on the right side of the finger support shaft 250 is supported so as not to be rotatable relative to the tip of the first connecting arm 271.

[0101] A second intermediate support plate 272 is provided to the left of the first intermediate support plate 265 and is located approximately in the center in the left-right direction of the auger body 241. The second intermediate support plate 272 is a plate-shaped portion perpendicular to the rotation axis C1, and is fixed to the peripheral wall 243. An intermediate support shaft 275, whose axis coincides with the rotation axis C1, is supported by the second intermediate support plate 272 so as to be rotatable relative to the rotation axis C1 while penetrating the second intermediate support plate 272 via a bearing member 276 such as a bearing.

[0102] A left end of the first finger support shaft 250A is connected to a right end of the intermediate support shaft 275 via a second connecting arm 277. The second connecting arm 277 is connected to both the intermediate support shaft 275 and the first finger support shaft 250A by a fixing bolt 277a so as not to rotate relative to each other. The fixing bolt 277a is fastened and fixed by a nut or the like in a state in which it penetrates the second connecting arm 277 in the longitudinal direction and also penetrates both the intermediate support shaft 275 and the first finger support shaft 250A in the radial direction.

[0103] A second connecting arm 277 is attached to the left end of the intermediate support shaft 275. of The right end of the second finger support shaft 250B located on the left side of the finger support shaft 250 is connected via a third connecting arm 278 through a structure that is approximately symmetrical to the connecting structure of the first finger support shaft 250A via the third connecting arm 278. The third connecting arm 278 is connected to both the intermediate support shaft 275 and the second finger support shaft 250B by a fixing bolt 278a so as not to rotate relative to each other. The fixing bolt 278a is fastened and fixed by a nut or the like in a state where it penetrates the third connecting arm 278 in the longitudinal direction and both the intermediate support shaft 275 and the second finger support shaft 250B in the radial direction.

[0104] A right end of the fixed support shaft 262 is connected to a left end of the second finger support shaft 250B via a fourth connecting arm 279. The fourth connecting arm 279 is connected to both the second finger support shaft 250B and the fixed support shaft 262 by a fixing bolt 279a so as not to rotate relative to each other. The fixing bolt 279a passes through the fourth connecting arm 279 in the longitudinal direction and passes through both the second finger support shaft 250B and the fixed support shaft 262 in the radial direction, and is fastened and fixed by a nut or the like.

[0105] The left end of the fixed support shaft 262 is fixed to the left side wall portion 201 via a mounting plate 280. The mounting plate 280 is a plate-shaped member through which the fixed support shaft 262 penetrates and which is fixed to the fixed support shaft 262, and is fixed to the outside (left side) of the left side wall portion 201 by a fastener such as a bolt. A disk-shaped winding prevention plate 281 is provided on the inside (right side) of the left side wall portion 201 so as to close the left opening edge of the peripheral wall portion 243. The winding prevention plate 281 is fastened and fixed to the left side wall portion 201 together with the mounting plate 280 by a fastener. The fixed support shaft 262 is supported by a left end surface portion 244, which is a part of the auger main body portion 241, in a state in which it penetrates through the left end surface portion 244 via a bearing member 282 such as a bearing, so as to be relatively rotatable.

[0106] In the above configuration, from the left, there are the fixed support shaft 262, the fourth connecting arm 279, the second finger support shaft 250B, the third connecting arm 278, the intermediate support shaft 275, Second connecting arm 27 7 , first finger support shaft 250A, and first connecting arm 271 are fixed to left side wall 201 of platform 31, and form a fixed shaft structure within platform 31. The right side of this fixed shaft structure is supported by a rotation support shaft 261 rotatably provided to right side wall 202. The auger body 241, blade 242, and rotation support shaft 261 form a rotating part that rotates integrally about rotation axis C1 with respect to the fixed shaft structure, and the plurality of raking fingers 240 form an eccentric rotating part that rotates about axis C2 at an eccentric position in conjunction with the rotation of the rotating part.

[0107] In the above-described configuration, a sweeping finger 240 is supported on each of first finger support shaft 250A and second finger support shaft 250B. As shown in Fig. 11, in this embodiment, one sweeping finger 240 is provided on first finger support shaft 250A, and eight sweeping fingers 240 are provided on second finger support shaft 250B, for a total of nine sweeping fingers 240.

[0108] The first finger support shaft 250A is provided with a sweeping finger 240 at its right end. The second finger support shaft 250B is provided with seven sweeping fingers 240 arranged continuously in the left-right direction at its right section, and one sweeping finger 240 at its left section. Hereinafter, for the convenience of identifying the sweeping fingers 240, the nine sweeping fingers 240 are referred to as first to ninth fingers 240a to 240i from right to left. That is, the first finger support shaft 250A is provided with the first finger 240a, and the second finger support shaft 250B is provided with second to ninth fingers 240b to 240i.

[0109] The slide bushes 247 supporting the respective raking fingers 240 are provided at 90° intervals in the circumferential direction of the auger body 241 when viewed in the axial direction of the rotation axis C1. In other words, the nine raking fingers 240 are located at any one of first to fourth phase positions spaced at 90° intervals in the circumferential direction of the auger body 241.

[0110] In this embodiment, as shown in Figs. 11 and 12, in a left side view of the raking auger 37, the first finger 240a, the second finger 240b, and the fifth finger 240e are located in the first phase position P1 in the clockwise order in the circumferential direction of the auger body 241. The third finger 240c and the seventh finger 240g are located in the second phase position P2. The fourth finger 240d, the eighth finger 240h, and the ninth finger 240i are located in the third phase position P3. The sixth finger 240f is located in the fourth phase position P4.

[0111] Furthermore, the raking auger 37 is provided with a plurality of openings 285 used for the assembly and maintenance of the internal structure of the auger body 241. The openings 285 have a structure in which holes formed in the peripheral wall 243 are covered with a lid 286. The lid 286 is curved to follow the curved shape of the peripheral wall 243, and is provided removably with respect to the peripheral wall 243 by bolts or the like. In this embodiment, the openings 285 are provided at seven locations in the auger body 241 at positions that do not interfere with the blades 242 and the raking fingers 240.

[0112] According to the raking auger 37 having the above-mentioned configuration, the raking action of the plurality of raking fingers 240 is obtained for the harvested stalks sent from the rear end of the stalk conveying device 33 into the platform 31, and within the platform 31, the wing portion 242 sends the stalks toward the inlet 205, while the plurality of raking fingers 240 send the stalks toward the inlet 205. Here, at the front side of the raking auger 37, the raking fingers 240 protrude relatively far from the peripheral wall portion 243 to rake in the stalks, and at the rear side of the raking auger 37, the raking fingers 240 protrude less from the peripheral wall portion 243, preventing interference between the raking fingers 240 and other members.

[0113] The combine harvester 1 having the above-mentioned configuration has the following configuration regarding the arrangement of the raking fingers 240 in the raking auger 37. That is, among the multiple raking fingers 240, the multiple raking fingers 240 located in front of the feeder 30 are arranged in a spiral shape along the spiral of the blade portion 242.

[0114] As shown in Fig. 12, in the rake-in auger 37, seven fingers 240b to 240h are provided in the feeder front portion of the auger body 241 corresponding to the opening range E1 of the inlet 205 of the feeder 30. Of these seven rake-in fingers 240, four rake-in fingers 240, namely, the third finger 240c, the fifth finger 240e, the sixth finger 240f, and the eighth finger 240h, are arranged in a spiral shape so as to follow the spiral shape of the left blade 242L of the left and right blades 242. Hereinafter, the four rake-in fingers 240 arranged in a spiral shape are collectively referred to as "spiral-arranged fingers."

[0115] As shown in Fig. 12, the spirally arranged fingers are arranged along a spiral straight line L1 that is inclined in the same direction as the straight line representing the left blade portion 242L with respect to a direction along a plane perpendicular to the rotation axis C1 (the up-down direction in Fig. 12, hereinafter referred to as the "transverse cross-sectional direction") in a development view of the raking auger 37. In Fig. 12, the spiral straight line L1 is indicated by a dashed line.

[0116] Each rake finger 240 of the spirally arranged fingers is arranged so that the helical straight line L1 passes through or near the center of the circumferential outer shape in the development view shown in Fig. 12. However, each rake finger 240 of the spirally arranged fingers may be arranged so that the helical straight line L1 passes within the range of the circumferential outer shape. In other words, each rake finger 240 of the spirally arranged fingers may be arranged at a position where at least a portion of the rake finger 240 overlaps the helical straight line L1.

[0117] In the development shown in FIG. 12, the inclination angle of the spiral straight line L1 is approximately the same as the inclination angle of the left wing portion 242L. Here, the inclination angle is an angle with respect to the cross-sectional direction in the development of the raking auger 37. In this embodiment, specifically, the inclination angle θ1 of the left wing portion 242L is approximately 25°, and the inclination angle θ2 of the spiral straight line L1 is approximately 20°. The inclination angle of the spiral straight line L1 that defines the arrangement of the spirally arranged fingers is set, for example, to be within the range of the inclination angle θ1±10°, more preferably within the range of the inclination angle θ1±5°, with respect to the inclination angle θ1 of the left wing portion 242L.

[0118] The spirally arranged fingers are positioned in order in the left-right direction at 90° intervals (equally spaced) in the circumferential direction of the auger body 241. That is, in order from right to left in the circumferential direction of the auger body 241, the third finger 240c is positioned at the second phase position P2, the fifth finger 240e is positioned at the first phase position P1, the sixth finger 240f is positioned at the fourth phase position P4, and the eighth finger 240h is positioned at the third phase position P3. In this way, the spirally arranged fingers are provided in a range where the number of turns is 1, that is, over a range of 360° in the circumferential direction of the auger body 241.

[0119] The combine harvester 1 has the following configuration regarding the positional relationship between the spirally arranged fingers and the blade portion 242. As shown in Fig. 12, the arrangement range G1 of the spirally arranged fingers in the left-right direction includes the range of the blade portion non-forming region D0. That is, in the left-right direction, the left end position Ga of the arrangement range G1 of the spirally arranged fingers is located to the left of the right end position Da of the left blade portion 242L that defines the left end position of the blade portion non-forming region D0. Also, in the left-right direction, the right end position Gb of the arrangement range G1 of the spirally arranged fingers is located to the right of the left end position Db of the right blade portion 242R that defines the right end position of the blade portion non-forming region D0.

[0120] In this way, the spirally disposed fingers are arranged so that part of their arrangement range G1 in the left-right direction overlaps with the formation range of left wing portion 242L in the left-right direction. That is, as shown in Fig. 12, the spirally disposed fingers are arranged so that there is an overlapping range H1 between arrangement range G1 and the range of left wing portion formation region D2 in the left-right direction. Here, of the spirally disposed fingers, eighth finger 240h, which is located at the leftmost position, is located to the left of position Da of the right end of left wing portion 242L in the left-right direction.

[0121] The spirally disposed fingers are also arranged so that their arrangement range G1 in the left-right direction overlaps with the formation range of the right wing portion 242R in the left-right direction. That is, as shown in Fig. 12, the spirally disposed fingers are arranged so that there is an overlapping range H2 between the arrangement range G1 and the right wing portion formation region D1 in the left-right direction. Here, of the spirally disposed fingers, the third finger 240c located at the rightmost position is located at approximately the same position in the left-right direction as the position Db of the left end of the right wing portion 242R.

[0122] In this way, the arrangement range G1 of the spirally arranged finger has overlapping portions with respect to each of the right wing portion-forming region D1 and the left wing portion-forming region D2. In other words, the spirally arranged finger is arranged such that its arrangement range G1 covers the region between the right wing portion-forming region D1 and the left wing portion-forming region D2.

[0123] Next, the positional relationship between the spirally arranged fingers and the stump conveying devices 33 will be described. As described above, the three stump conveying devices 33 on the left side are arranged so that their positions can be adjusted in the left-right direction. Among the four stump conveying devices 33, the stump conveying device 33 located in front of the feeder 30 is the second stump conveying device 33 from the left (hereinafter referred to as the "feeder front stump conveying device 33A").

[0124] With respect to the arrangement of the spirally arranged fingers, at least one of the raking fingers 240 of the spirally arranged fingers is located within the adjustment range of the conveying passage 215 by adjusting the position of the pre-feeder stalk conveying device 33A. For the stalk conveying device 33, the adjustment range of the conveying passage 215 by adjusting the position is the adjustment range of the conveying line T0.

[0125] In FIG. 12, the adjustment widths of the conveying lines T0 of the three stalk conveying devices 33 on the left side are indicated by hatched band-shaped areas U2, U3, and U4. To If the stalk conveying device 33 located at the right end is the first row, the area portions U2, U3, and U4 represent the movable range in the left-right direction of the conveying line T0 of the stalk conveying device 33 for the second, third, and fourth rows, respectively. The dimension of the adjustment width of the three stalk conveying devices 33 is a common dimension V1. In addition, since the stalk conveying device 33 located at the right end has a fixed position of the conveying line T0, the adjustment width of the conveying line T0 is indicated by a straight line U1.

[0126] In Fig. 12, the adjustment width of the feeder front stalk conveying device 33A is represented by the region U3. Among the spirally arranged fingers, the third finger 240c and the fifth finger 240e on the right side are located within the region U3. In addition to the spirally arranged fingers, the second finger 240b and the fourth finger 240d are also located within the region U3.

[0127] In this embodiment, two of the spirally arranged fingers 240 are located within the region of the area portion U3, but it is sufficient that at least one of the spirally arranged fingers 240 is located within the region of the area portion U3. Also, in this embodiment, the three stump conveying devices 33 on the left side are arranged so that their positions can be adjusted in the left-right direction, but from the viewpoint of the positional relationship between the stump conveying devices 33 and the spirally arranged fingers, it is sufficient that at least the stump conveying device 33 located in front of the feeder 30 (the feeder front stump conveying device 33A) is arranged so that its position can be adjusted in the left-right direction.

[0128] As described above, the combine harvester 1 according to this embodiment includes four raking fingers 240 arranged in a spiral shape along the spiral of the blade portion 242 in the raking auger 37. The number of raking fingers 240 arranged in a spiral shape along the spiral of the blade portion 242 is not particularly limited. The multiple raking fingers 240 arranged in a spiral shape along the spiral of the blade portion 242 may be at least two raking fingers 240 located on a straight line inclined in the same manner as the inclination of the left blade portion 242L in the development view shown in FIG. 12, for example, and preferably three or more raking fingers 240 located on the same straight line.

[0129] In addition, in this embodiment, four rake-in fingers 240 are provided as the spirally arranged rake-in fingers 240 arranged at 90° intervals in the circumferential direction of the auger body 241, but the arrangement interval of the rake-in fingers 240 in the circumferential direction of the auger body 241 is not particularly limited. For example, six rake-in fingers 240 arranged at 60° intervals in the circumferential direction may be provided as the spirally arranged rake-in fingers 240.

[0130] In this embodiment, the helically arranged sweeping fingers 240 are provided along the spiral in accordance with the direction of the spiral of the left wing portion 242L, but may be provided along the spiral of the right wing portion 242R.

[0131] 6, 13, and 14, in the harvesting unit 3 according to this embodiment, a guide member 100 is provided at the intake port 205 of the feeder 30. The guide member 100 is provided at the upper portion of the intake port 205, and is a guide plate that guides the crops raked in by the raking auger 37 to the feeder 30.

[0132] The guide member 100 is a member formed by bending a plate-like member into a predetermined shape, has a rectangular shape with the left-right direction as the longitudinal direction when viewed from the front, and is formed symmetrically or approximately symmetrically. The guide member 100 is provided so as to cover the upper edge of the inlet 205, which has a rectangular opening shape, from the front. The guide member 100 has a constant width in the vertical direction, and is provided so as to entirely cover the upper edge of the inlet 205 in the horizontal direction.

[0133] Guide member 100 has guide surface portion 101 which is its main body portion, and left and right side surface portions 102 provided on both the left and right sides of guide surface portion 101. Guide member 100 also has upper fixing surface portions 103 formed on the upper side of guide surface portion 101 along the upper edge portion of guide surface portion 101, and side fixing surface portions 104 formed by bending relative to side surface portions 102 along rear edges of left and right side surface portions 102, as attachment portions for opening edge portion 203c of inlet 205 in rear wall surface portion 203b of rear wall portion 203.

[0134] The guide surface portion 101 is provided in an inclined manner with respect to the rear wall surface portion 203b so as to gradually move forward from the upper side to the lower side. In the platform 31 in a forward-inclined posture, the guide surface portion 101 becomes a surface portion in a vertically hanging state (see FIG. 14). In a side view, the angle that the guide surface portion 101 makes with the rear wall surface portion 203b is, for example, about 20°.

[0135] The left and right side surface portions 102 are surfaces bent to form right angles with the guide surface portion 101 at the left and right edges of the guide surface portion 101. The left and right side surface portions 102 have a substantially isosceles triangular shape with a lower rear corner being a right angle so as to cover the gap between the rear wall surface portion 203b and the guide surface portion 101 in accordance with the inclination of the guide surface portion 101 with respect to the rear wall surface portion 203b.

[0136] The guide member 100 has the upper fixing surface portion 103 and the side fixing surface portion 104 fixed from the front side to the opening edge portion 203c of the rear wall surface portion 203b by bolts 105. The bolts 105 pass through the opening edge portion 203c and are screwed into nuts 106 provided on the rear side of the opening edge portion 203c. The fixing portions using the bolts 105 are provided at five locations in total, three locations on both the left and right sides and the center of the upper fixing surface portion 103 and one location on each of the side fixing surface portions 104.

[0137] According to the above-mentioned configuration in which the guide member 100 is provided at the inlet 205, the upper part of the inlet 205 is covered with the guide member 100, so that the stalks are prevented from returning from inside the feeder house 35 to the platform 31 side, that is, the backflow of the stalks is prevented. Specifically, this is as follows.

[0138] As shown in Fig. 14, the conveyor 36 is driven in the forward direction (see arrow R1) by the reaping unit input shaft 38 (see Fig. 4) rotating counterclockwise as viewed from the left side, and the stalks taken into the feeder house 35 by the raking auger 37 are hooked onto the slats 96 and transported diagonally upward and rearward. That is, when the conveyor 36 is driven in the forward direction, the path portion of the straight chain 95 located below the sprocket 97 and front drum 98 becomes the forward path portion moving from the front to the rear, and the path portion of the straight chain 95 located above the sprocket 97 and front drum 98 becomes the return path portion moving from the rear to the front.

[0139] In such a mode of transporting the culms by the conveyor 36, in the upper part of the front drum 98, the slats 96 move from the rear side to the front side when turning back backward, and the culms caught on the slats 96 may rotate with the front drum 98 and be released toward the raking auger 37 side in the platform 31 and flow back (see arrow R2). Therefore, by providing a guide member 100 on the path of the backflow of the culms that are trying to flow back by the conveyor 36, the culms that are trying to flow back are blocked. The culms blocked by the guide member 100 fall and are taken into the feeder 30 by the conveyor 36. In this way, the guide member 100 functions as a backflow prevention plate that prevents the culms from flowing back from the feeder 30 to the platform 31.

[0140] According to the combine harvester 1 of this embodiment having the above-described configuration, the harvested crops can be smoothly taken into the feeder 30 by the raking auger 37, and the crops can be supplied to the threshing section 7 without stagnation.

[0141] The raking auger 37 has spirally arranged fingers at the feeder front portion of the auger body 241. With this configuration, in addition to the original raking action of the raking fingers 240, a feeding action is obtained by the spiral arrangement of the raking fingers 240. As a result, the harvested stalks are less likely to become entangled with the raking fingers 240 in front of the intake port 205 of the feeder 30, and stagnation and clogging of the stalks can be suppressed, allowing the stalks to be smoothly handed over to the feeder 30.

[0142] In the raking auger 37, the portion of the blade non-forming region D0 is a portion where the culms do not fall properly due to the absence of the blade 242, and the culms tend to remain, resulting in intermittent transport. On the other hand, the narrowing of the space between the left and right blades 242 by extending the blade 242 toward the blade non-forming region D0 side can cause clogging of the culms. Therefore, by arranging the raking finger 240 in a spiral shape along the blade 242 in the region including the blade non-forming region D0, the culms can be knocked down even in the region where the blade 242 is not present, and the clogging of the culms can be suppressed, and the space between the left and right blades 242 can be secured, thereby suppressing clogging of the culms. This allows for good intake and transport properties of the culms.

[0143] In the combine harvester 1, the harvesting section 3 is configured as a row crop header equipped with a plurality of stalk transport devices 33 in front of the raking auger 37. With this configuration, for example, in harvesting beans such as soybeans and adzuki beans, the spirally arranged fingers of the raking auger 37 can effectively capture and transport stalks.

[0144] In the harvesting section 3, the feeder pre-culm conveying device 33A is provided so that its position can be adjusted in the left-right direction, and a part of the spirally arranged fingers, the raking fingers 240, are positioned within the adjustable width of the conveying line T0 of the feeder pre-culm conveying device 33A. With this configuration, the spirally arranged fingers of the raking auger 37 can obtain good intake and conveyance of the culm, regardless of the change in the position of the feeder pre-culm conveying device 33A accompanying the adjustment of the row spacing T1.

[0145] The spirally arranged finger is provided so that the left side of its arrangement range G1 overlaps with the formation range of the left wing portion 242L. With this configuration, the feeding action of the left wing portion 242L and the action of the spirally arranged finger can be continuously and synergistically applied to the stump, so that the spirally arranged finger of the raking auger 37 can effectively obtain good intake and transportability of the stump.

[0146] In this embodiment, the spirally arranged finger is provided so that the right side of its arrangement range G1 overlaps with the formation range of the right wing portion 242R. With this configuration, the feeding action of the right wing portion 242R and the action of the spirally arranged finger can be made to act synergistically on the stumps, so that the spirally arranged finger of the raking auger 37 can effectively obtain good intake and transportability of the stumps.

[0147] In addition, in the reaping section 3, the intake port 205 is provided with a guide member 100 that guides the reaped stalks to the feeder 30. This configuration prevents the stalks from flowing back from the feeder 30 to the platform 31, so that the reaped stalks can be efficiently taken into the feeder 30 and can be supplied to the threshing section 7 without stagnation.

[0148] In the guide member 100, the guide surface portion 101 is provided as a vertically hanging surface portion by inclining it relative to the rear wall surface portion 203b of the platform 31. With this configuration, the stalks that hit the guide member 100 can be guided from the guide surface portion 101 to a lower position. This makes it possible to prevent the stalks from clogging between the guide member 100 and the conveyor 36.

[0149] Furthermore, the guide member 100 is provided such that, in the front-rear direction, the downward extension line X1 of the guide surface portion 101 that receives the backflowing stump is positioned rearward of the auger body portion 241 of the raking auger 37. With this configuration, the stump falling along the guide surface portion 101 can be prevented from contacting the auger body portion 241, and the backflow of the stump can be effectively prevented.

[0150] The combine harvester according to the present invention described above using the embodiments is not limited to the above-mentioned embodiments, and various aspects can be adopted within the scope of the spirit of the present invention. [Explanation of symbols]

[0151] 1. Combine Harvester 3 Reaping section 7. Threshing Department 30 Feeder (supply and transport device) 31 Platform 33 Grain straw transport device 33A Grain straw transport device before feeder 34 Reaping device 36 Conveyor 37. Scavenging Auger 100 Guide member 200 Row Crop Units 205 Intake 215 Transport Passage 220 Belt conveyor (conveyor) 240 Sweeping Finger 241 Auger body 241a Outer surface 242 Wing 242L Left wing (second wing) 242R Right wing (first wing) D2 Left wing formation area G1 Placement Range

Claims

1. A combine harvester comprising a supplying and conveying device provided in front of a threshing section, and a raking auger provided in front of the supplying and conveying device for raking crops into the supplying and conveying device, The auger has a cylindrical auger body with a rotation axis in the left-right direction, a spiral blade portion provided on the outer peripheral surface of the auger body, and a plurality of raking fingers protruding from the outer peripheral surface of the auger body, Among the plurality of scavenging fingers, a plurality of scavenging fingers located in front of the supply conveying device are arranged in a spiral shape along the spiral of the blade portion, A plurality of stalk conveying devices for conveying crops by a pair of conveying bodies are provided in front of the raking auger, Among the plurality of stalk conveying devices, at least the stalk conveying device located in front of the supply conveying device is provided so that the position of the conveying passage can be adjusted in the left-right direction, At least one of the plurality of helically arranged raking fingers is located within an adjustment width of the conveying passage by adjusting the position of the stalk conveying device located in front of the supply conveying device. A combine harvester characterized by the above.

2. The raking auger has, as the blade portion, a first blade portion provided on one side of the left and right of a portion in front of the supply and conveying device in the auger body, and a second blade portion provided on the other side of the portion in the auger body and formed in a range shorter than the first blade portion in the left and right direction, The plurality of spirally arranged raking fingers are provided so that a part of their arrangement range in the left-right direction overlaps with a formation range of the second blade portion in the left-right direction. The combine harvester according to claim 1 .

3. A guide member is provided at the intake port of the supplying and conveying device to guide the crops raked in by the raking auger to the supplying and conveying device. The combine harvester according to claim 1 or 2.

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