Work vehicle

Abstract

To cause reaped grain culms to hardly adhere to a rotation part with a simple configuration.SOLUTION: A work vehicle 1 includes: a traveling device 102 traveling on a farm field; a traveling machine body 101 arranged above the traveling device 102; a reaping device 200; a thresher 300; and a grain culm conveyance device 210. The reaping device 200 is arranged in the traveling machine body 101, and reaps unreaped grain culms in the farm field. The thresher 300 threshes reaped grain culms reaped by the reaping device 200. The grain culm conveyance device 210 conveys the reaped grain culms from the reaping device 200 to the thresher 300. The grain culm conveyance device 210 has an annular conveyance chain 214A and a second roller 213. The second roller 213 rotates the conveyance chain 214A while supporting it. The second roller 213 includes a shaft 31 which is a rotation shaft, and a cover 40. The cover 40 covers the shaft 31 in a circumferential direction of the shaft 31. The cover 40 has a holding part 60 for holding the shaft 31 so as to rotate relatively.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a work vehicle. [Background technology]

[0002] The straw winding prevention drum mounting structure of Patent Document 1 is a straw winding prevention drum mounting structure for a rotating shaft, in which a straw winding prevention drum is mounted on the rotating shaft via a pair of left and right bearings so that the drum can rotate freely relative to the rotating shaft. In the straw winding prevention drum mounting structure of Patent Document 1, the bearings are made of collars, and the bearings and the straw winding prevention drum are each divided in the circumferential direction, and the split drums are attached to the split bearings. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-210844 Summary of the Invention [Problem to be solved by the invention]

[0004] In the straw winding prevention drum mounting structure of Patent Document 1, both the collar that constitutes the bearing and the straw winding prevention drum are each divided in the circumferential direction, which increases the number of parts and complicates the structure.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a work vehicle with a simple configuration in which harvested straw is less likely to adhere to the rotating parts. [Means for solving the problem]

[0006] The work vehicle according to the present invention comprises a traveling device, a traveling machine body, a reaping device, a thresher, and a transport device. The traveling device travels in a field. The traveling machine body is disposed above the traveling device. The reaping device is disposed on the traveling machine body and harvests uncut stalks in the field. The thresher threshes the harvested stalks harvested by the reaping device. The transport device transports the harvested stalks from the reaping device to the thresher. The transport device has a circular transport chain and a rotating unit. The rotating unit supports and rotates the transport chain. The rotating unit includes a shaft which is a rotating axis, and a cover. The cover covers the shaft in the circumferential direction of the shaft. The cover has a holding unit which holds the shaft so that it can rotate relatively. Effect of the Invention

[0007] According to the present invention, a simple configuration is provided to prevent harvested stalks from adhering to the rotating part. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a right side view of the work vehicle according to the present embodiment. [Diagram 2] FIG. 2 is a left side view of the work vehicle according to the present embodiment. [Diagram 3] FIG. 2 is a diagram showing a grain straw transport device of the work vehicle according to the present embodiment. [Figure 4] FIG. 13 is a diagram showing a second roller included in the grain stalk conveying device. [Diagram 5] FIG. 13 is a diagram showing the second roller with the conveyor chain removed. [Figure 6] FIG. [Figure 7] FIG. 4 is a cross-sectional view taken along the axial direction of the second roller. [Figure 8] FIG. 8 is an enlarged view of a portion of FIG. [Figure 9] 4 is a cross-sectional view taken along a line passing through the retaining portion and perpendicular to the axial direction of the shaft. FIG. [Figure 10] 11 is a cross-sectional view perpendicular to the axial direction of the shaft, passing through a position other than the holding portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0010] A work vehicle according to this embodiment will be described with reference to Figures 1 and 2. Figure 1 is a right side view of the work vehicle 1 according to this embodiment. Figure 2 is a left side view of the work vehicle 1 according to this embodiment.

[0011] In this specification, for ease of understanding, the front-rear direction, the left-right direction, and the up-down direction may be described. Here, the front-rear direction, the left-right direction, and the up-down direction are directions seen from a driver (worker) seated in a driver's seat (not shown) arranged in the driving space 2a (FIG. 1). However, the front-rear direction, the left-right direction, and the up-down direction are defined merely for convenience of explanation, and are not intended to limit the orientation of the work vehicle of the present invention when used or assembled. In addition, the forward direction may be described as the front direction facing the driver seated in the driver's seat.

[0012] The work vehicle 1 is, for example, a normal type combine harvester. The work vehicle 1 performs harvesting work of agricultural crops while traveling based on the operation of the worker. The work vehicle 1 can travel automatically based on the instruction of the worker, and may perform harvesting work of agricultural crops while traveling automatically. The instruction for automatic travel is input to the work vehicle 1 by, for example, the worker operating a display operation device (not shown). The work vehicle 1 is not limited to a combine harvester, and may be any vehicle that can travel automatically in a field. Examples of work vehicles include a seeding machine that travels while sowing seeds in a field, a fertilizer applicator that travels while applying fertilizer to a field, a chemical sprayer that travels while spraying chemicals in a field, a rice transplanter that travels while performing planting work of seedlings, a tiller, and a tractor. Harvesting work, sowing, fertilization, chemical spraying, and planting work are examples of work by a work vehicle.

[0013] Autonomous driving means that at least steering is performed autonomously along a predetermined route by controlling devices related to driving by a control unit (not shown) equipped in the work vehicle 1. In addition to steering, the vehicle speed or work by a work device may be performed autonomously. Autonomous driving includes a case where a person is on board the work vehicle 1 and a case where a person is not on board the work vehicle 1.

[0014] As shown in Figures 1 and 2, the work vehicle 1 of this embodiment includes a traveling body 101, a traveling device 102, a reaping device 200, a stalk transporting device 210, a threshing device 300 (Figure 2), a sorting device 350 (Figure 2), and a grain tank 400 (Figure 1). The traveling body 101 is disposed above the traveling device 102 and supported by the traveling body 101. The reaping device 200 is disposed in front of the traveling body 101. The reaping device 200 and the threshing device 300 are examples of agricultural work equipment.

[0015] The traveling machine body 101 (work vehicle 1) is equipped with an engine (not shown). The engine is, for example, a diesel engine. The engine converts thermal energy obtained by burning fuel into kinetic energy (power).

[0016] The traveling device 102 travels in the field. In other words, the traveling device 102 causes the work vehicle 1 to travel in the field. Specifically, the traveling device 102 travels based on power (kinetic energy) generated in the engine. The traveling device 102 includes, for example, a pair of left and right traveling crawler devices. The pair of left and right traveling crawler devices causes the work vehicle 1 to travel in the forward and backward directions. In addition, the pair of left and right traveling crawler devices causes the work vehicle 1 to turn in the left and right directions.

[0017] The reaping device 200 is driven based on power (kinetic energy) generated in an engine. The reaping device 200 reaps uncut stalks in a farm field. In this embodiment, the reaping device 200 includes a reaping frame 201.

[0018] The reaping frame 201 is mounted so as to be movable up and down on the front part of the traveling body 101. A cutting blade is disposed below the reaping frame 201. The reaping device 200 reciprocates the cutting blade to cut the base of uncut stalks in the field.

[0019] The stalk conveying device 210 conveys the stalks cut by the cutting blade of the reaping device 200 from the reaping device 200 to the threshing device 300. The stalk conveying device 210 is an example of a conveying device.

[0020] The work vehicle 1 can drive the traveling device 102 to move within the field, while driving the reaping device 200 to continuously reap uncut stalks in the field.

[0021] The threshing device 300 is driven by power (kinetic energy) generated by the engine. The threshing device 300 performs threshing work to thresh the reaped stalks transported to the traveling machine body 101 by the stalk transport device 210. The reaping work is included in the harvesting work. The sorting device 350 shakes and sorts (gravity sorts) the ear side (removed grain) of the reaped stalks threshed by the threshing device 300.

[0022] As shown in Fig. 2, the threshing device 300 also includes a winnower 303. The winnower 303 supplies screening air to the reaped stalks after threshing. As a result, straw and other impurities are removed from the grains (threshed grains) that are being shaken and screened. The grains from which the straw and other impurities have been removed are transported to and stored in the grain tank 400 (Fig. 1).

[0023] Next, the stump conveying device 210 of the work vehicle 1 according to this embodiment will be described with reference to Figs. 3 to 5. Fig. 3 is a diagram showing the stump conveying device 210 of the work vehicle 1 according to this embodiment. Fig. 3 shows the internal structure of the stump conveying device 210 with part of the outer wall of the stump conveying device 210 omitted. Fig. 4 is a diagram showing a second roller 213 included in the stump conveying device 210. Fig. 5 is a diagram showing the second roller 213 with the pair of conveyor chains 214A removed.

[0024] As shown in Fig. 3, the stalk conveying device 210 has a feeder house 211, a first roller 212, a second roller 213, a pair of conveying chains 214A (see Fig. 4), and a plurality of bases 214B. The feeder house 211 houses the first roller 212, the second roller 213, the conveying chain A 214A, and a plurality of bases 214B. The feeder house 211 is an example of a housing section.

[0025] In the feeder house 211, the first roller 212 is disposed on the front side, that is, on the cutting blade side of the reaping device 200. The second roller 213 is disposed on the rear side, that is, on the threshing device 300 side.

[0026] The second roller 213 is rotatably attached to the feeder house 211. Specifically, the second roller 213 has a cylindrical shape extending in the left-right direction. One end (left side) of the second roller 213 is rotatably supported on the left wall surface of the feeder house 211. The other end (right side) of the second roller 213 is rotatably supported on the right wall surface of the feeder house 211.

[0027] The second roller 213 is driven based on power (kinetic energy) generated in the engine. For example, the power generated in the engine is transmitted to the second roller 213 via a transmission, gears, and the like (not shown). As a result, the second roller 213 rotates around the central axis of the second roller 213.

[0028] The first roller 212 is rotatably attached to the feeder house 211. Specifically, the first roller 212 has a cylindrical shape extending in the left-right direction. One end (left side) of the first roller 212 is rotatably attached to the left wall surface of the feeder house 211. The other end (right side) of the first roller 212 is rotatably attached to the right wall surface of the feeder house 211. By attaching the first roller 212 and the second roller 213 to the inside of the feeder house 211 in this manner, the harvested stalks harvested by the cutting blade of the harvesting device 200 are transported to the threshing device 300.

[0029] 3 and 4, a pair of conveyor chains 214A are wound around and attached to the first roller 212 and the second roller 213. The first roller 212 and the second roller 213 support and rotate the conveyor chain 214A.

[0030] Specifically, one of the pair of conveying chains 214A is attached to one (left) side of the first roller 212 and one (left) side of the second roller 213. The other of the pair of conveying chains 214A is attached to the other (right) side of the first roller 212 and the other (right) side of the second roller 213. Each of the pair of conveying chains 214A is annular. In other words, the pair of conveying chains 214A attached to the first roller 212 and the second roller 213 rotates in one direction with the second roller 213 as a driving shaft and the first roller 212 as a driven shaft.

[0031] Each of the bases 214B connects the pair of conveyor chains 214A to each other. As a result, the bases 214B rotate with the rotation of the pair of conveyor chains 214A. The harvested stalks that have been harvested by the blade of the harvesting device 200 and reached the feeder house 211 are transported by the bases 214B in one direction, for example, from front to rear, along the bottom plate 211S of the feeder house 211.

[0032] Next, the second roller 213 will be described in detail with reference to Figures 5 and 6. Figure 6 is an exploded view of the second roller 213.

[0033] As shown in FIG. 6, the second roller 213 has a shaft 31, a cover 40, and a pair of sprockets (chain wheels) 50A and 50B. The cover 40 includes a first cover 41 and a second cover 42. The first cover 41 and the second cover 42 are connected to each other along the circumferential direction of the shaft 31 by a plurality of bolts 71 and a plurality of nuts 72 to form the cover 40. The cover 40 is produced, for example, by resin molding. In the cover 40, the head and tip of the bolt 71 are located inside the outer circumferential surface of the cover 40. This makes it possible to prevent straw chips and the like from getting caught on the head and tip of the bolt 71. The first cover 41 and the second cover 42 may be bonded by an adhesive or connected by a snap fit formed between them, other than by the bolt 71 and the nut 72.

[0034] The shaft 31 is a cylindrical member extending in the left-right direction. Both ends of the shaft 31 are rotatably attached to the feeder house 211. The cover 40 extends along the axial direction of the shaft 31 and covers the entire circumferential direction of the shaft 31. In other words, the first cover 41 covers a portion (half of the circumference) of the shaft 31 in the circumferential direction. The second cover 42 is connected to the first cover 41 in the circumferential direction and covers the other portion (half of the circumference) of the shaft 31 in the circumferential direction.

[0035] As shown in FIG. 6, sprocket 50A includes support portion 51A and protrusion portion 52A. Sprocket 50B includes support portion 51B and protrusion portion 52B. Support portions 51A and 51B support a pair of conveyor chains 214A. Specifically, support portions 51A and 51B are disk-shaped spur gears that rotate about shaft 31. One of the pair of conveyor chains 214A is wound around support portion 51A. The other of the pair of conveyor chains 214A is wound around support portion 51B. In other words, the pair of supports 51A and 51B are arranged in the axial direction of shaft 31 at a distance corresponding to the interval between the pair of conveyor chains 214A.

[0036] The protrusion 52A extends from the support portion 51A toward the center side in the axial direction of the shaft 31. The protrusion 52A rotates coaxially with the support portion 51A. The protrusion 52B extends from the support portion 51B toward the center side in the axial direction of the shaft 31. The protrusion 52B rotates coaxially with the support portion 51B. Each of the protrusions 52A and 52B includes a first protrusion 52a and a second protrusion 52b. The first protrusion 52a is cylindrical and extends from the support portion 51A. The diameter of the first protrusion 52a is smaller than the diameters of the support portions 51A and 51B. For example, the diameter of the first protrusion 52a is approximately the same as the inner diameter of the cover 40 and is smaller than the inner diameter of the cover 40. In the axial direction of shaft 31, support portion 51A, first protrusion 52a, and second protrusion 52b are arranged in this order from the end side toward the center of shaft 31. Similarly, support portion 51B, first protrusion 52a, and second protrusion 52b are arranged in this order from the end side toward the center of shaft 31. Details of support portion 51A, support portion 51B, first protrusion 52a, and second protrusion 52b will be described later with reference to FIG. 8.

[0037] The cover 40 covers the area between the support portions 51A and 51B of the shaft 31 in the axial direction of the shaft 31. That is, the protrusion 52A is located inside the cover 40, at the left end of the cover 40 in the axial direction of the shaft 31. The protrusion 52B is located inside the cover 40, at the right end of the cover 40 in the axial direction of the shaft 31. In other words, the protrusions 52A and 52B are located at both end portions of the cover 40 (each of the first cover 41 and the second cover 42) in the axial direction of the shaft 31, respectively.

[0038] Moreover, the cover 40 has holding portions 60A, 60B, and 60C. Specifically, the first cover 41 and the second cover 42 each have the holding portions 60A, 60B, and 60C. The holding portions 60A, 60B, and 60C are provided on the inside (shaft 31 side) of the cover 40. For example, the holding portions 60A, 60B, and 60C are arranged at equal intervals along the axial direction of the shaft 31. Specifically, the holding portion 60C is arranged in the center of the cover 40 along the axial direction of the shaft 31. The holding portion 60A is arranged on one side (left) of the holding portion 60C. The holding portion 60B is arranged on the other side (right) of the holding portion 60C.

[0039] Next, the positional relationship between the cover 40 and the shaft 31 will be described with reference to Fig. 6 and Fig. 7. Fig. 7 is a cross-sectional view taken along the axial direction of the second roller 213. Fig. 7 shows a cross-section taken along line VII-VII in Fig. 5.

[0040] As shown in FIG. 6 and FIG. 7, the holding parts 60A, 60B, 60C hold the shaft 31 so as to be relatively rotatable. Specifically, each of the holding parts 60A, 60B, 60C includes a first wall part 61a and a second wall part 61b. The first wall part 61a and the second wall part 61b extend perpendicularly to the axial direction of the shaft 31 and hold the shaft 31 so as to be relatively rotatable. In other words, the first wall part 61a and the second wall part 61b form a "node" for the cylindrical cover 40. The first wall part 61a and the second wall part 61b are disposed at a predetermined interval in the axial direction of the shaft 31. As a result, in each of the holding parts 60A, 60B, 60C, a space 62 is formed between the first wall part 61a and the second wall part 61b. The space 62 will be described later.

[0041] The holding parts 60A, 60B, and 60C hold the shaft 31, so that the cover 40 rotates together with the rotation of the shaft 31. On the other hand, if the harvested stalks being transported by the rotation of the pair of transport chains 214A adhere to the second roller 213 and start to be wound around the second roller 213, the harvested stalks will resist the rotation of the second roller 213, and the cover 40 will rotate relative to the shaft 31. As a result, the rotation of the cover 40 relative to the stalk transport device 210 will stop, and the harvested stalks will not easily get wrapped around the second roller 213.

[0042] In this way, by providing the cover 40 with the holding portions 60A, 60B, 60C that hold the shaft 31 relatively rotatably, the shaft 31 can be covered in the circumferential direction only by the cover 40. Therefore, the number of accessories that cover the shaft 31 in the circumferential direction can be reduced, and the simple configuration makes it difficult for the harvested stalks to adhere to the second roller 213.

[0043] Next, the positional relationship between the cover 40 (first cover 41) and the sprocket 50A will be described with reference to FIG. 8. FIG. 8 is an enlarged view of area VII indicated by a dashed line in FIG. 7. FIG. 8 representatively shows the positional relationship between the first cover 41 and the sprocket 50A. Note that the positional relationship between the first cover 41 and the sprocket 50B, the positional relationship between the second cover 42 and the sprocket 50A, and the positional relationship between the second cover 42 and the sprocket 50B are the same as the positional relationship shown in FIG. 8. The sprockets 50A, 50B are attached to the shaft 31 by bolts 65. In detail, the bolts 65 fix the second protrusions 52b of the sprockets 50A, 50B to the shaft 31.

[0044] As shown in FIG. 8, a gap of distance L2 is formed between the end face 66b of the first cover 41 in the axial direction of the shaft 31 and the support portion 51A. In addition, the diameter of the first protrusion 52a is approximately the same as the inner diameter of the first cover 41 and is smaller than the inner diameter of the first cover 41, so a gap of distance L4 is formed between the outer peripheral surface 56d of the first protrusion 52a and the inner peripheral surface 41w of the first cover 41. In this way, a gap curved and connected in the axial direction and radial direction is formed between the first cover 41 and the support portion 51A and the first protrusion 52a. Furthermore, a flange portion 52d extending toward the center side in the axial direction is provided on the radial edge of the first protrusion 52a. The second protrusion portion 52b is cylindrical and extends from the first protrusion portion 52a. The outer diameter of the second protrusion portion 52b is smaller than the first protrusion portion 52a (the inner diameter of the flange portion 52d). In this way, the cover 40 (first cover 41) and the sprocket 50A form a labyrinth structure so that the harvested stalks are less likely to enter between the first cover 41 and the first protrusion 52a. In particular, by providing the flange 52d, the axial length of the gap between the outer peripheral surface 56d and the inner peripheral surface 41w can be increased, making it more difficult for the harvested stalks to reach the space formed between the second protrusion 52b and the inner peripheral surface 41w.

[0045] As shown in FIG. 8, in the axial direction of the shaft 31, a distance L1 between the holding portion 60A and the protrusion 52A is shorter than a distance L2 between the end of the first cover 41 and the support portion 51A.

[0046] Specifically, distance L1 indicates the distance of the gap between surface 66a of first wall portion 61a of retaining portion 60A facing sprocket 50A and end surface 56a of second protrusion 52b of protrusion 52A facing first cover 41. Distance L2 indicates the distance between end surface 66b of first cover 41 facing sprocket 50A and surface 56b of support portion 51A facing first cover 41. By making distance L1 shorter than distance L2, cover 40 rotates in conjunction with rotation of second roller 213.

[0047] Further, in the radial direction of the shaft 31, a distance L3 between the shaft 31 and the holding portion 60A is shorter than a distance L4 between the inner circumferential surface 41w of the first cover 41 and the outer circumferential surface 56d of the first protrusion 52a.

[0048] Specifically, distance L3 indicates the distance of the gap between an end face 66c of the first wall portion 61a of the holding portion 60A on the shaft 31 side and the surface 31s of the shaft 31. Distance L4 indicates the distance of the gap between an inner circumferential surface 41w of the first cover 41 and an outer circumferential surface 56d of the first protrusion portion 52a of the protrusion portion 52A. By making distance L3 shorter than distance L4, the cover 40 rotates in conjunction with the rotation of the second roller 213.

[0049] In addition, in this embodiment, the diameter of the shaft 31 is smaller than the diameter of the first protrusion 52a. Therefore, the torque of the shaft 31 is smaller than the torque of the first protrusion 52a. Therefore, when the cover 40 starts to wrap the harvested stalks, the torque of the cover 40 due to the frictional force with the harvested stalks becomes larger than the torque of the shaft 31, and the cover 40 rotates (idles) relative to the shaft 31. This causes the second roller 213 to stop rotating relatively. As a result, it becomes easier to prevent the harvested stalks from wrapping around the shaft 31. This makes the harvested stalks transporting process in the stalk transport device 210 smoother, and the working time of the harvesting work by the work vehicle 1 is shortened, so that the fuel consumption of the work vehicle 1 can be reduced, that is, energy saving can be achieved, which contributes to reducing the emission of greenhouse gases (Green House Gas).

[0050] Next, the structure of the cover 40 will be described with reference to Fig. 9 and Fig. 10. Fig. 9 is a cross-sectional view perpendicular to the axial direction of the shaft 31 and passing through the holding portion 60C. Fig. 9 shows a cross-section along line IX-IX in Fig. 5. Fig. 10 shows a cross-section along line XX in Fig. 5. Fig. 10 is a cross-sectional view perpendicular to the axial direction of the shaft 31 and passing through a position that is not one of the holding portions 60A, 60B, or 60C.

[0051] As shown in FIG. 9 and FIG. 10, the first cover 41 and the second cover 42 are connected to each other along the circumferential direction of the shaft 31. That is, the first cover 41 has opposing surfaces 41A and 41B with the second cover 42. The second cover 42 has opposing surfaces 42A and 42B with the first cover 41. The opposing surfaces 41A and 41B are located at the ends of the first cover 41 in the circumferential direction. The opposing surfaces 41A and 41B are located on opposite sides of the shaft 31. The opposing surfaces 42A and 42B are located on opposite sides of the shaft 31. The opposing surface 41A contacts and faces the opposing surface 42A. The opposing surface 41B contacts and faces the opposing surface 42B. The opposing surfaces 41A and 41B are an example of a first surface. The opposing surfaces 42A and 42B are an example of a second surface.

[0052] As an example, the first cover 41 has a first convex portion 41P and a first recessed portion 41S. The first convex portion 41P is provided on the opposing surface 41A. The first recessed portion 41S is provided on the opposing surface 41B. The second cover 42 has a second convex portion 42P and a second recessed portion 42S. The second convex portion 42P is provided on the opposing surface 42B. The second recessed portion 42S is provided on the opposing surface 41A. In a state in which the first cover 41 and the second cover 42 are connected, the first convex portion 41P fits into the second recessed portion 42S, and the first recessed portion 41S fits into the second convex portion 42P. Each of the first convex portion 41P, the first recessed portion 41S, the second convex portion 42P, and the second recessed portion 42S is provided, for example, in a direction along the axial direction of the shaft 31. Specifically, the first convex portion 41P and the second convex portion 42P have a wall shape extending along the axial direction of the shaft 31. The first recessed portion 41S and the second recessed portion 42S have a groove shape extending along the axial direction of the shaft 31. For example, the first convex portion 41P, the first recessed portion 41S, the second convex portion 42P, and the second recessed portion 42S each extend from one end of the cover 40 to the other end in the axial direction.

[0053] Typically, the first recess 41S is provided in the radial center of the opposing surface 41A. The first protrusion 41P is not limited to the radial center of the opposing surface 41A, but may be located away from at least one of the end of the opposing surface 41A on the shaft 31 side and the end on the opposite side to the shaft 31 side. Similarly, the first recess 41S is located away from the end of the opposing surface 41B on the shaft 31 side and the end on the opposite side to the shaft 31 side. The second protrusion 42P is located away from the end of the opposing surface 42B on the shaft 31 side and the end on the opposite side to the shaft 31 side. The second recess 42S is located away from the end of the opposing surface 42A on the shaft 31 side and the end on the opposite side to the shaft 31 side.

[0054] Although the first convex portion 41P, the first concave portion 41S, the second convex portion 42P and the second concave portion 42S are each configured to extend from one axial end of the cover 40 to the other axial end, for example, the configuration may be such that a plurality of first convex portions 41P, a plurality of first concave portions 41S, a plurality of second convex portions 42P and a plurality of second concave portions 42S are arranged side by side along the axial direction, or the plurality of first convex portions 41P, a plurality of first concave portions 41S, a plurality of second convex portions 42P and a plurality of second concave portions 42S are arranged side by side along the radial direction.

[0055] By providing convex and concave portions on the opposing surfaces of the first cover 41 and the second cover 42, these function to position the first cover 41 and the second cover 42 relative to each other, and also reinforce the rigidity of the first cover 41 and the second cover 42 to suppress deformation of the first cover 41 and the second cover 42, making it less likely for gaps to form between the first cover 41 and the second cover 42, and making it less likely for chopped straw or straw chips from harvested grain stalks to become stuck between the first cover 41 and the second cover 42.

[0056] Next, with reference to FIG. 7 and FIG. 9, other functions of the holding part 60 will be described. In this embodiment, the space 62 formed between the first wall part 61a and the second wall part 61b of the holding part 60 is filled with grease 90. The first cover 41 and the second cover 42 have an injection port 82 through which the grease 90 is injected. The injection port 82 penetrates the first cover 41 and the second cover 42 in the radial direction and connects to the space 62. In the cover 40, the grease 90 (FIG. 9) is filled into the space 62 through the injection port 82. The injection port 82 is covered by, for example, a bolt 81. Note that the cover of the injection port 82 is not limited to the bolt 81, and may be, for example, a plug pressed into the injection port 82. Note that in the cover 40, the head of the bolt 81 is located inside the outer circumferential surface of the cover 40. This makes it possible to prevent straw chips and the like from getting caught on the head of the bolt 81.

[0057] Here, if the shape of bolt 81 that is a lid for injection port 82 is made different from that of bolt 71 that connects first cover 41 and second cover 42, the user will be less likely to confuse bolt 71 and bolt 81.

[0058] 8 and other drawings, the cover 40 can move a distance L2 toward both sides in the axial direction of the shaft 31. As the cover 40 moves, the grease 90 filled in the space 62 permeates between the shaft 31 and the first wall portion 61a or the second wall portion 61b.

[0059] By providing the cover 40 with a space 62 in which the grease 90 is filled and an injection port 82 connected to the space 62, the grease 90 can be applied between the shaft 31 and the holding part 60 without removing the cover 40 from the shaft 31.

[0060] In the present embodiment, the cover 40 is configured by connecting the first cover 41 and the second cover 42, but the present invention is not limited to this, and the cover 40 may be a single cover, or may be configured by connecting three or more members to each other. When the cover 40 is configured by the first cover 41 and the second cover 42, it becomes easy to manufacture the first cover 41 and the second cover 42 by resin molding, and it becomes easy to attach the cover 40 to the shaft 31.

[0061] In this embodiment, the first roller 212 may have the same configuration as the second roller 213. That is, the first roller 212 may include the shaft 31, the sprockets 50A and 50B, and the cover 40. In this case, the second roller 213 does not need to be provided with the sprockets 50A and 50B and the cover 40.

[0062] The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments, and can be implemented in various aspects without departing from the gist of the present invention. In addition, the components disclosed in the above embodiments can be modified as appropriate. For example, a certain component among all the components shown in one embodiment may be added to a component of another embodiment, or some components among all the components shown in one embodiment may be deleted from the embodiment.

[0063] In addition, the drawings are mainly schematic illustrations of each component to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of creating the drawings. In addition, the configurations of each component shown in the above embodiment are merely examples and are not particularly limited, and it goes without saying that various modifications are possible within a range that does not substantially deviate from the effects of the present invention.

[0064] The present technology can be configured as follows. (1) a traveling device for traveling in a field; A traveling machine body arranged above the traveling device; A reaping device arranged on the traveling machine body and reaping uncut stalks in the field; A threshing device that threshes the culms harvested by the harvesting device; A conveying device that conveys the harvested stalks from the harvesting device to the threshing device; Equipped with The conveying device is A circular conveying chain; a rotating section that supports and rotates the conveyor chain; having The rotating part is A shaft which is a rotating shaft; a cover that covers the shaft in a circumferential direction of the shaft; Including, The cover has a holding portion that holds the shaft so as to be relatively rotatable. Work vehicle. (2) The cover is a first cover that covers a portion of the shaft in a circumferential direction of the shaft; a second cover that is connected to the first cover in the circumferential direction and covers another portion of the shaft; (1) A work vehicle, including: (3) The first cover is a first surface located at an end of the first cover in the circumferential direction and facing the second cover; a first recess or a first protrusion disposed on the first surface; having The second cover is a second surface opposite to the first surface; and a second convex portion or a second concave portion that is disposed on the second surface and fits into the first concave portion or the first convex portion; having the first concave portion or the first convex portion is located away from at least one of an end portion on the shaft side and an end portion on the opposite side to the shaft on the first surface, The work vehicle of (2), wherein the second concave portion or the second convex portion is located away from at least one of the end portion on the shaft side and the end portion opposite the shaft on the second surface. (4) The rotating part is A support portion that supports the conveyor belt; a protrusion portion extending from the support portion toward a center side in the axial direction of the shaft; having the protrusion is located inside the cover and at an end of the cover in the axial direction, The work vehicle according to any one of (1) to (3), wherein a continuous gap is formed between the support portion and the cover, and between the protrusion portion and the cover. (5) A work vehicle according to (4) or (5), wherein the distance between the retaining portion and the protrusion in the axial direction is shorter than the distance between the end face of the cover and the support portion. (6) A work vehicle according to (5), wherein the distance between the shaft and the retaining portion in the radial direction of the shaft is shorter than the distance between the cover and the protrusion. (7) Grease is filled between the shaft and the holding portion, The work vehicle of any one of (1) to (6), wherein the cover has an injection port through which the grease is injected. (8) The conveying device is The conveyor belt and the rotating part are further provided with a housing part. The work vehicle of any one of (1) to (7), wherein the shaft is rotatably attached to the housing portion. [Industrial Applicability]

[0065] The present invention can be used in the field of work vehicles. [Explanation of symbols]

[0066] 1: Work vehicle 31: Shaft 40: Cover 41: First cover 41A: Opposite surface 41B: Opposite surface 41P: First protrusion 41S: First recess 42: 2nd cover 42A: Opposite surface 42B: Opposite surface 42P: Second protrusion 42S: Second recess 51A: Support part 51B: Support part 52A:Protrusion 52B:Protrusion 60: Holding part 60A: Retaining part 60B: Holding part 60C: Holding part 82: Inlet 90: Grease 101: Running vehicle 102: Running gear 200: Reaping device 210: Grain straw transport device 211: Feeder House 213: Second roller 214A: Transport chain 300: Threshing machine L1: distance L2: Distance (gap) L3: Distance L4: Distance (gap)

Claims

1. A traveling device that travels in a field; A traveling machine body arranged above the traveling device; A reaping device arranged on the traveling machine body and reaping uncut stalks in the field; A threshing device that threshes the culms harvested by the harvesting device; A conveying device that conveys the harvested stalks from the harvesting device to the threshing device; Equipped with The conveying device is A circular conveying chain; a rotating section that supports and rotates the conveyor chain; having The rotating part is A shaft which is a rotating shaft; a cover that covers the shaft in a circumferential direction of the shaft; Including, A work vehicle, wherein the cover has a holding portion that holds the shaft so that the shaft can rotate relatively.

2. The cover is a first cover that covers a portion of the shaft in the circumferential direction of the shaft; a second cover that is connected to the first cover in the circumferential direction and covers another portion of the shaft; The work vehicle of claim 1 .

3. The first cover is a first surface located at an end of the first cover in the circumferential direction and facing the second cover; a first recess or a first protrusion disposed on the first surface; having The second cover is a second surface opposite to the first surface; and a second convex portion or a second concave portion that is disposed on the second surface and fits into the first concave portion or the first convex portion; having the first recess and the first protrusion are located away from at least one of an end of the first surface on the shaft side and an end of the first surface on the opposite side to the shaft side, The work vehicle according to claim 2 , wherein the second recess and the second protrusion are located away from at least one of an end of the second surface on the shaft side and an end of the second surface opposite to the shaft side.

4. The rotating part is A support portion that supports the conveyor chain; a protrusion extending from the support portion toward a center side in an axial direction of the shaft; having the protrusion is located inside the cover and at an end of the cover in the axial direction, The work vehicle according to claim 1 , wherein a continuous gap is formed between the support portion and the cover, and between the protrusion portion and the cover.

5. The work vehicle according to claim 4 , wherein a distance between the holding portion and the protrusion in the axial direction is shorter than a distance between an end face of the cover and the support portion.

6. The work vehicle according to claim 5 , wherein a distance between the shaft and the holding portion in a radial direction of the shaft is shorter than a distance between the cover and the protrusion.

7. Grease is filled between the shaft and the holding portion, The work vehicle according to claim 1 , wherein the cover has an injection port through which the grease is injected.

8. The conveying device is The conveyor further includes a housing portion that houses the conveyor chain and the rotating portion, The work vehicle according to claim 1 , wherein the shaft is rotatably attached to the housing portion.

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