Work vehicle

Abstract

The present invention provides a work vehicle capable of making it difficult to attach a cut ear stalk to a rotating part by using a simple structure. A work vehicle (1) is provided with: a traveling device (102) that travels in a field; a traveling machine body (101) that is disposed above the traveling device (102); a harvesting device (200); a threshing device (300); the cutting device (200) is disposed on the traveling machine body (101) and cuts uncut ears in the field. The threshing device (300) threshes the cut ear stalks cut by the cutting device (200). The ear stalk conveying device (210) conveys the cut ear stalks from the cutting device (200) to the threshing device (300). The ear stalk conveying device is provided with an annular conveying chain (214A) and a second roller (213). The second roller rotates the conveyor chain while supporting the conveyor chain. The second roller includes a shaft (31) as a rotating shaft and a cover (40). The cover covers the shaft in the circumferential direction of the shaft. The cover has a holding portion (60) that holds the shaft so as to be relatively rotatable.

Description

Technical Field

[0001] The invention relates to a working vehicle. Background Art

[0002] The anti-straw winding drum installation structure of Patent Document 1 is a rotating shaft anti-straw winding drum installation structure as follows: the anti-straw winding drum is installed on the rotating shaft in a relatively rotatable manner by means of a pair of left and right bearings. Regarding the anti-straw winding drum installation structure of Patent Document 1, the bearing is formed by a shaft ring, and the bearing and the anti-straw winding drum are respectively divided in the circumferential direction and the divided drum is installed on the divided bearing.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 10-210844 Summary of the invention

[0006] In the straw winding prevention drum mounting structure of Patent Document 1, both the shaft ring constituting the bearing and the straw winding prevention drum are divided in the circumferential direction, so the number of components increases and the structure becomes complicated.

[0007] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a working vehicle that can make it difficult for cut ear stalks to adhere to a rotating part with a simple structure.

[0008] The work vehicle involved in the present invention comprises a travel device, a travel body, a harvesting device, a threshing device and a conveying device. The travel device travels on a field. The travel body is arranged above the travel device. The harvesting device is arranged on the travel body and harvests unharvested ear stalks in the field. The threshing device thres the harvested ear stalks harvested by the harvesting device. The conveying device conveys the harvested ear stalks from the harvesting device to the threshing device. The conveying device has an annular conveying chain and a rotating part. The rotating part rotates the conveying chain while supporting the conveying chain. The rotating part includes a shaft as a rotating shaft and a cover. The cover covers the shaft in the circumferential direction of the shaft. The cover has a holding part that holds the shaft so as to be relatively rotatable.

[0009] Effects of the Invention

[0010] According to the present invention, it is possible to make it difficult for the cut ear stalks to adhere to the rotating part with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a right side view of the work vehicle according to the present embodiment.

[0012] Figure 2 It is a left side view of the work vehicle according to the present embodiment.

[0013] Figure 3 It is a figure which shows the ear stem conveying device of the working vehicle which concerns on this embodiment.

[0014] Figure 4 This is a diagram showing the second roller included in the ear stem conveying device.

[0015] Figure 5 This is a diagram showing the second roller in a state where the conveyor chain is removed.

[0016] Figure 6 This is an exploded view of the second roller.

[0017] Figure 7 It is a cross-sectional view of the second roller along the axial direction.

[0018] Figure 8 yes Figure 7 A magnified view of a portion of .

[0019] Fig. 9 This is a cross-sectional view passing through the retaining portion and perpendicular to the axial direction of the shaft.

[0020] Fig.10 This is a cross-sectional view that passes through a position other than the holding portion and is perpendicular to the axial direction of the shaft.

[0021] Description of Reference Numerals

[0022] 1…working vehicle; 31…axle; 40…cover; 41…first cover; 41A…opposing surface; 41B…opposing surface; 41P…first convex portion; 41S…first concave portion; 42…second cover; 42A…opposing surface; 42B…opposing surface; 42P…second convex portion; 42S…second concave portion; 51A…support portion; 51B…support portion; 52A…protrusion; 52B…protrusion; 60…holding portion; 60 A…holding part; 60B…holding part; 60C…holding part; 82…injection port; 90…grease; 101…traveling body; 102…traveling device; 200…harvesting device; 210…stalk conveying device; 211…feeding chamber; 213…second roller; 214A…conveying chain; 300…threshing device; L1…distance; L2…distance (gap); L3…distance; L4…distance (gap). DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same reference numerals are given to the same or corresponding parts in the drawings, and the description thereof will not be repeated.

[0024] Reference Figure 1 and Figure 2A work vehicle according to the present embodiment will be described. Figure 1 It is a right side view of the work vehicle 1 according to the present embodiment. Figure 2 It is a left side view of the work vehicle 1 according to the present embodiment.

[0025] In addition, in this specification, for easy understanding, the front-back direction, the left-right direction, and the up-down direction are sometimes described. Here, the front-back direction, the left-right direction, and the up-down direction are from the seated person in the driving space 2a ( Figure 1 ) is viewed from the driver (operator) of the driver's seat. However, for the sake of convenience, the front-to-back direction, the left-to-right direction, and the up-down direction are only defined, and the definition of the above directions is not intended to limit the orientation of the working vehicle of the present invention during use and assembly. In addition, the front is sometimes referred to as the front direction facing the driver sitting in the driver's seat.

[0026] As an example, the working vehicle 1 is a common combine harvester. The working vehicle 1 can perform harvesting operations of crops while driving based on the operation of the operator. In addition, the working vehicle 1 can automatically drive based on the instructions of the operator, and perform harvesting operations of crops while driving automatically. In addition, the instruction of automatic driving is input to the working vehicle 1, for example, by the operator operating a display operation device not shown in the figure. In addition, the working vehicle 1 is not limited to a combine harvester, as long as it is a vehicle that can automatically drive in a field. As working vehicles, there are sowing machines that drive while sowing seeds on the field, fertilizer machines that drive while applying fertilizers on the field, chemical spreaders that drive while spreading chemicals on the field, rice transplanters, tillers and tractors that drive while performing planting operations of seedlings, etc. Harvesting operations, sowing, fertilizing, chemical spreading and planting operations are examples of operations of working vehicles.

[0027] Automatic driving means that the working vehicle 1 controls the driving-related devices by a control unit (not shown) provided therein, and at least autonomously performs steering in a manner along a predetermined path. In addition, the vehicle speed or the operation based on the working device may be autonomously controlled based on the steering. Automatic driving includes the case where a person is riding in the working vehicle 1 and the case where a person is not riding in the working vehicle 1.

[0028] like Figure 1 and Figure 2 As shown, the working vehicle 1 of this embodiment includes a traveling body 101, a traveling device 102, a harvesting device 200, a stalk conveying device 210, and a threshing device 300 ( Figure 2 )、Screening device 350( Figure 2 ) and grain box 400 ( Figure 1). The traveling body 101 is arranged above the traveling device 102 and is supported by the traveling body 101. The harvesting device 200 is arranged in front of the traveling body 101. The harvesting device 200 and the threshing device 300 are examples of agricultural working devices.

[0029] The traveling machine body 101 (work vehicle 1) includes an engine (not shown). The engine is, for example, a diesel engine. The engine converts heat energy obtained by burning fuel into kinetic energy (power).

[0030] The travel device 102 travels in the field. In other words, the travel device 102 causes the work vehicle 1 to travel in the field. Specifically, the travel device 102 travels based on the power (kinetic energy) generated by the engine. The travel device 102 includes, for example, a pair of left and right travel crawler devices. The pair of left and right travel crawler devices causes the work vehicle 1 to travel in the front-rear direction. In addition, the pair of left and right travel crawler devices causes the work vehicle 1 to turn in the left-right direction.

[0031] The harvesting device 200 is driven based on the power (kinetic energy) generated by the engine. The harvesting device 200 harvests unharvested ear stalks in the field. In the present embodiment, the harvesting device 200 includes a harvesting frame 201 .

[0032] The harvesting frame 201 is mounted on the front part of the traveling body 101 so as to be freely raised and lowered. The cutting blade is arranged below the harvesting frame 201. The harvesting device 200 reciprocates the cutting blade in order to cut off the root of the unharvested ear stalks in the field.

[0033] The ear stem transport device 210 transports the harvested ear stems harvested by the cutting blade of the harvesting device 200 from the harvesting device 200 to the threshing device 300. The ear stem transport device 210 is an example of a transport device.

[0034] The work vehicle 1 can drive the travel device 102 to move in the field, and can drive the harvesting device 200 to continuously harvest unharvested ear stalks in the field.

[0035] The threshing device 300 is driven based on the power (kinetic energy) generated by the engine. The threshing device 300 performs a threshing operation of threshing the cut ear stalks transported to the traveling machine body 101 by the ear stalk transport device 210. The harvesting operation includes the reaping operation. The screening device 350 performs swing screening (specific gravity screening) on ​​the ear tip side (threshed material) of the cut ear stalks after threshing by the threshing device 300.

[0036] In addition, if Figure 2As shown, the threshing device 300 includes a winnowing machine 303. The winnowing machine 303 supplies screening wind toward the cut ear stalks after threshing. As a result, straw scraps and foreign substances in the swing-screened grains (threshed material) are removed. The grains after the straw scraps and foreign substances are removed are transported and stored in the grain box 400 ( Figure 1 ).

[0037] Next, refer to Figure 3 to Figure 5 The stem conveying device 210 of the work vehicle 1 according to the present embodiment will be described. Figure 3 1 is a diagram showing a stem conveying device 210 of the work vehicle 1 according to the present embodiment. Figure 3 A part of the outer wall of the spike-stem conveying device 210 is omitted and the internal structure of the spike-stem conveying device 210 is shown. Figure 4 1 and 2. It is a diagram showing the second roller 213 included in the stem transporting device 210. Figure 5 This is a diagram showing the second roller 213 in a state where a pair of conveyor chains 214A are removed.

[0038] like Figure 3 As shown, the spike stalk conveying device 210 includes a feed chamber 211, a first roller 212, a second roller 213, and a pair of conveying chains 214A (see Figure 4 ) and a plurality of bases 214B. The feed chamber 211 accommodates the first roller 212, the second roller 213, the conveyor chain A214A and the plurality of bases 214B. The feed chamber 211 is an example of a storage unit.

[0039] In the supply chamber 211, the 1st roller 212 is arrange|positioned at the front side, that is, the cutting blade side of the harvesting device 200. The 2nd roller 213 is arrange|positioned at the rear side, that is, the threshing device 300 side.

[0040] The second roller 213 is rotatably mounted on the feed chamber 211. Specifically, the second roller 213 is cylindrical and extends in the left-right direction. One end (left side) of the second roller 213 is rotatably supported on the left wall of the feed chamber 211. The other end (right side) of the second roller 213 is rotatably supported on the right wall of the feed chamber 211.

[0041] The second roller 213 is driven based on the power (kinetic energy) generated by the engine. For example, the power generated by the engine is transmitted to the second roller 213 via a transmission and gears (not shown). As a result, the second roller 213 rotates around the central axis of the second roller 213.

[0042] The first roller 212 is rotatably mounted on the feeding chamber 211. Specifically, the first roller 212 is cylindrical and extends in the left-right direction. One side (left side) end of the first roller 212 is rotatably mounted on the left side wall of the feeding chamber 211. The other side (right side) end of the first roller 212 is rotatably mounted on the right side wall of the feeding chamber 211. In this way, the first roller 212 and the second roller 213 are mounted on the inner side of the feeding chamber 211, and the cut ear stalks cut by the cutting knife of the cutting device 200 are transported to the threshing device 300.

[0043] like Figure 3 and Figure 4 As shown, a pair of conveyor chains 214A are wound around the first roller 212 and the second roller 213. The first roller 212 and the second roller 213 rotate the conveyor chains 214A while supporting them.

[0044] Specifically, one of the pair of conveyor chains 214A is installed on one (left) side of the first roller 212 and one (left) side of the second roller 213. The other of the pair of conveyor chains 214A is installed on the other (right) side of the first roller 212 and the other (right) side of the second roller 213. The pair of conveyor chains 214A are respectively ring-shaped. In other words, the pair of conveyor chains 214A installed on the first roller 212 and the second roller 213 rotate in one direction with the second roller 213 as the driving shaft and the first roller 212 as the driven shaft.

[0045] The plurality of bases 214B respectively connect the pair of conveyor chains 214A to each other. As a result, the plurality of bases 214B rotates with the rotation of the pair of conveyor chains 214A. The harvested ear stalks harvested by the cutting blade of the harvesting device 200 and reaching the feed chamber 211 are transported along the bottom plate 211S of the feed chamber 211 in one direction, for example, from the front to the rear, by the plurality of bases 214B.

[0046] Next, refer to Figure 5 and Figure 6 The second roller 213 will be described in detail. Figure 6 This is an exploded view of the second roller 213 .

[0047] like Figure 6As shown, the second roller 213 has a shaft 31, a cover 40, and a pair of chain wheels 50A, 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 using 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 of the bolt 71 and the terminal end of the bolt 71 are located at a position further inside than the surface of the outer periphery of the cover 40. Thereby, it is possible to prevent straw scraps and the like from getting caught on the head of the bolt 71 and the terminal end of the bolt 71. In addition, in addition to the bolts 71 and the nuts 72, the first cover 41 and the second cover 42 can also be bonded using an adhesive or connected using snap-fit ​​parts formed with each other.

[0048] The shaft 31 is a cylindrical component extending in the left-right direction. Both ends of the shaft 31 are rotatably mounted in the feed chamber 211. The cover 40 extends along the axial direction of the shaft 31 and covers the entire circumference of the shaft 31. In other words, the first cover 41 covers a portion (half circumference) of the circumference of the shaft 31. The second cover 42 is connected to the first cover 41 in the circumferential direction and covers another portion (half circumference) of the circumference of the shaft 31.

[0049] like Figure 6 As shown, the sprocket 50A includes a support portion 51A and a protrusion 52A. The sprocket 50B includes a support portion 51B and a protrusion 52B. The support portions 51A and 51B support a pair of conveyor chains 214A. Specifically, the support portion 51A and the support portion 51B are disc-shaped spur gears that rotate around the shaft 31. One of the conveyor chains 214A is wound around the support portion 51A. The other conveyor chain in the pair of conveyor chains 214A is wound around the support portion 51B. In other words, the pair of support portions 51A and 51B are arranged to be separated in the axial direction of the shaft 31 by a distance corresponding to the interval between the pair of conveyor chains 214A.

[0050] The protrusion 52A extends from the support 51A toward the center side in the axial direction of the shaft 31. The protrusion 52A rotates coaxially with respect to the support 51A. The protrusion 52B extends from the support 51B toward the center side in the axial direction of the shaft 31. The protrusion 52B rotates coaxially with respect to the support 51B. The protrusion 52A and the protrusion 52B include a first protrusion 52a and a second protrusion 52b, respectively. The first protrusion 52a is cylindrical and extends from the support 51A. The diameter of the first protrusion 52a is smaller than the diameters of the support 51A and the support 51B. For example, the diameter of the first protrusion 52a is 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 the shaft 31, the support 51A, the first protrusion 52a, and the second protrusion 52b are arranged in this order from the end side of the shaft 31 toward the center. Similarly, the support portion 51B, the first protrusion 52a, and the second protrusion 52b are arranged in this order from the end side of the shaft 31 toward the center. Figure 8 The support portion 51A, the support portion 51B, the first protrusion 52a, and the second protrusion 52b are described in detail.

[0051] The cover 40 covers the space between the support portion 51A and the support portion 51B of the shaft 31 in the axial direction of the shaft 31. That is, the protrusion 52A is located inside the cover 40 and located at the end portion of the cover 40 on the left side in the axial direction of the shaft 31. The protrusion 52B is located inside the cover 40 and located at the end portion of the cover 40 on the right side in the axial direction of the shaft 31. In other words, the protrusions 52A and 52B are located at the ends on both sides of the cover 40 (the first cover 41 and the second cover 42) in the axial direction of the shaft 31.

[0052] In addition, the cover 40 has retaining portions 60A, 60B, and 60C. Specifically, the first cover 41 and the second cover 42 have retaining portions 60A, 60B, and 60C, respectively. The retaining portions 60A, 60B, and 60C are provided on the inner side (the shaft 31 side) of the cover 40. For example, the retaining portions 60A, 60B, and 60C are arranged at equal intervals along the axial direction of the shaft 31. Specifically, the retaining portion 60C is arranged at the center of the cover 40 along the axial direction of the shaft 31. The retaining portion 60A is arranged to be closer to one (left) side than the retaining portion 60C. The retaining portion 60B is arranged to be closer to the other (right) side than the retaining portion 60C.

[0053] Next, refer to Figure 6 and Figure 7 The positional relationship between the cover 40 and the shaft 31 will be described. Figure 7 It is a cross-sectional view of the second roller 213 along the axial direction. Figure 7 Shown along Figure 5 The cross section of line VII-VII.

[0054] like Figure 6 and Figure 7As shown, the retaining parts 60A, 60B, and 60C retain the shaft 31 so as to be relatively rotatable. Specifically, the retaining parts 60A, 60B, and 60C include a first wall part 61a and a second wall part 61b, respectively. The first wall part 61a and the second wall part 61b extend perpendicularly to the axial direction of the shaft 31, and retain 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 "section" relative to the cylindrical cover 40. The first wall part 61a and the second wall part 61b are arranged at a predetermined interval in the axial direction of the shaft 31. As a result, a space 62 is formed between the first wall part 61a and the second wall part 61b for each retaining part 60A, 60B, and 60C. The space 62 will be described later.

[0055] The holding parts 60A, 60B, and 60C hold the shaft 31 so that the cover 40 rotates along with the rotation of the shaft 31. On the other hand, if the cut ear stems conveyed by the rotation of the pair of conveyor chains 214A adhere to the second roller 213 and begin to be wound around the second roller 213, the cut ear stems become a rotation resistance of the second roller 213, so that the cover 40 rotates relative to the shaft 31. As a result, the rotation of the cover 40 relative to the ear stem conveying device 210 stops, making it difficult for the cut ear stems to be wound around the second roller 213.

[0056] In this way, the holding parts 60A, 60B, and 60C that hold the shaft 31 so as to be relatively rotatable are provided on the cover 40, so that the circumference of the shaft 31 can be covered only by the cover 40. Therefore, the number of spare parts that cover the circumference of the shaft 31 can be reduced, and the cut ear stems can be made less likely to adhere to the second roller 213 with a simple structure.

[0057] Next, refer to Figure 8 The positional relationship between the cover 40 (first cover 41) and the sprocket 50A will be described. Figure 8 yes Figure 7 An enlarged view of region VII indicated by the dotted line in FIG. Figure 8 The positional relationship between the first cover 41 and the sprocket 50A is shown as a representative example. In addition, 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 shown. Figure 8 The positional relationship shown is the same. The sprockets 50A and 50B are mounted on the shaft 31 by bolts 65. Specifically, the bolts 65 fix the second protrusions 52b of the sprockets 50A and 50B to the shaft 31.

[0058] like Figure 8As shown, 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 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 that is connected in a curved manner in the axial and radial directions is formed between the first cover 41, the support portion 51A and the first protrusion 52a. In addition, a flange portion 52d extending toward the central side in the axial direction is provided on the radial edge of the first protrusion 52a. The second protrusion 52b is cylindrical and extends from the first protrusion 52a. The outer diameter of the second protrusion 52b is smaller than the first protrusion 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 it is difficult for the cutting stem to enter between the first cover 41 and the first protrusion 52a. In particular, by providing the flange portion 52d, the axial length of the gap between the outer peripheral surface 56d and the inner peripheral surface 41w can be made longer, so that it is difficult for the cutting stem to reach the space formed between the second protrusion 52b and the inner peripheral surface 41w.

[0059] In addition, if Figure 8 As shown, in the axial direction of the shaft 31 , a distance L1 between the holding portion 60A and the protrusion 52A is smaller than a distance L2 between the end of the first cover 41 and the support portion 51A.

[0060] Specifically, the distance L1 indicates the distance of the gap between the surface 66a of the first wall portion 61a of the holding portion 60A facing the sprocket 50A side and the end surface 56a of the second protrusion 52b of the protrusion 52A on the first cover 41 side. The distance L2 indicates the distance between the end surface 66b of the first cover 41 on the sprocket 50A side and the surface 56b of the support portion 51A facing the first cover 41 side. The distance L1 is made smaller than the distance L2 so that the cover 40 rotates with the rotation of the second roller 213.

[0061] Furthermore, in the radial direction of the shaft 31 , a distance L3 between the shaft 31 and the holding portion 60A is smaller than a distance L4 between the inner peripheral surface 41 w of the first cover 41 and the outer peripheral surface 56 d of the first protrusion 52 a .

[0062] Specifically, the distance L3 indicates the distance of the gap between the 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. The distance L4 indicates the distance of the gap between the inner peripheral surface 41w of the first cover 41 and the outer peripheral surface 56d of the first protrusion 52a of the protrusion 52A. The distance L3 is made smaller than the distance L4 so that the cover 40 rotates with the rotation of the second roller 213.

[0063] In addition, in the present 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 wind the cut ear stalk, the torque of the cover 40 caused by the friction with the cut ear stalk is greater than the torque of the shaft 31, thereby causing the cover 40 to rotate relative to the shaft 31 (idling). As a result, the second roller 213 stops rotating relatively. As a result, it is easy to prevent the cut ear stalk from winding around the shaft 31. As a result, the conveying process of the cut ear stalk by the ear stalk conveying device 210 becomes smooth, and the operation time of the harvesting operation of the working vehicle 1 is shortened, so that the fuel consumption of the working vehicle 1 can be reduced, that is, energy saving can be achieved, which can help reduce the emission of greenhouse gases (Green house gas).

[0064] Next, refer to Fig. 9 and Fig.10 The structure of the cover 40 will be described. Fig. 9 This is a cross-sectional view that passes through the holding portion 60C and is perpendicular to the axial direction of the shaft 31 . Fig. 9 Shown along Figure 5 The cross section of line IX-IX. Fig.10 Shown along Figure 5 The cross section of line X-X. Fig.10 This is a cross-sectional view that passes through a position that is not one of the holding portions 60A, 60B, and 60C and is perpendicular to the axial direction of the shaft 31 .

[0065] like Fig. 9 and Fig.10 As shown, 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 opposing the second cover 42. The second cover 42 has opposing surfaces 42A and 42B opposing the first cover 41. The opposing surface 41A and the opposing surface 41B are located at the ends of the circumferential direction of the first cover 41. The opposing surface 41A and the opposing surface 41B are located on opposite sides of each other across the shaft 31. The opposing surface 42A and the opposing surface 42B are located on opposite sides of each other across 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 surface 41A and the opposing surface 41B are an example of the first surface. The opposing surface 42A and the opposing surface 42B are an example of the second surface.

[0066] As an example, the first cover 41 has a first convex portion 41P and a first concave portion 41S. The first convex portion 41P is provided on the facing surface 41A. The first concave portion 41S is provided on the facing surface 41B. The second cover 42 has a second convex portion 42P and a second concave portion 42S. The second convex portion 42P is provided on the facing surface 42B. The second concave portion 42S is provided on the facing surface 41A. In a state where the first cover 41 and the second cover 42 are connected, the first convex portion 41P is fitted into the second concave portion 42S, and the first concave portion 41S is fitted into the second convex portion 42P. The first convex portion 41P, the first concave portion 41S, the second convex portion 42P, and the second concave portion 42S are respectively 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 recess 41S and the second recess 42S have a groove shape extending in the axial direction of the shaft 31. For example, the first protrusion 41P, the first recess 41S, the second protrusion 42P, and the second recess 42S extend from one end of the cover 40 in the axial direction to the other end.

[0067] Typically, the first recess 41S is disposed at the radial center of the opposing surface 41A. In addition, the first protrusion 41P is not limited to the radial center of the opposing surface 41A, and may be located at least one of the end of the opposing surface 41A away from the axis 31 and the end on the opposite side of the axis 31. Similarly, the first recess 41S is located at the end of the opposing surface 41B away from the axis 31 and the end on the opposite side of the axis 31. The second protrusion 42P is located at the end of the opposing surface 42B away from the axis 31 and the end on the opposite side of the axis 31. The second recess 42S is located at the end of the opposing surface 42A away from the axis 31 and the end on the opposite side of the axis 31.

[0068] In addition, the first protrusion 41P, the first recess 41S, the second protrusion 42P and the second recess 42S are respectively formed as structures extending from the end on one side of the axial direction of the cover 40 to the end on the other side, but in addition to this, for example, multiple first protrusions 41P, multiple first recesses 41S, multiple second protrusions 42P and multiple second recesses 42S can also be formed as a structure arranged along the axial direction, and multiple first protrusions 41P, multiple first recesses 41S, multiple second protrusions 42P and multiple second recesses 42S can also be formed as a structure arranged along the radial direction.

[0069] By providing convex portions and concave portions on the opposing surfaces of the first cover 41 and the second cover 42, they can function as positioning portions for the first cover 41 and the second cover 42, and the rigidity of the first cover 41 and the second cover 42 can be strengthened to suppress deformation of the first cover 41 and the second cover 42, and it is difficult for a gap to be generated between the first cover 41 and the second cover 42, making it difficult for cut straw or straw scraps used to cut the ear stalk to penetrate between the first cover 41 and the second cover 42.

[0070] Next, refer to Figure 7 and Fig. 9 The other functions of the holding portion 60 are described. In the present embodiment, the space 62 formed between the first wall portion 61a and the second wall portion 61b of the holding portion 60 is filled with grease 90. The first cover 41 and the second cover 42 have an injection port 82 for injecting the grease 90. The injection port 82 penetrates the first cover 41 and the second cover 42 in the radial direction and is connected 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. In addition, the cover of the injection port 82 is not limited to the bolt 81, and may be, for example, a plug body pressed into the injection port 82. In addition, in the cover 40, the head of the bolt 81 is located at a position further inside than the surface of the outer periphery of the cover 40. Thus, it is possible to prevent straw scraps and the like from getting caught on the head of the bolt 81.

[0071] Here, if the shape of the bolt 81 that covers the injection port 82 is different from the shape of the bolt 71 that connects the first cover 41 and the second cover 42 , it is difficult for the user to mistake the bolt 71 for the bolt 81 .

[0072] like Figure 8 As shown in FIG. 1 and FIG. 2 , the cover 40 can move toward both sides by a distance L2 in the axial direction of the shaft 31. As the cover 40 moves, the grease 90 filled in the space 62 penetrates between the first wall portion 61a or the second wall portion 61b and the shaft 31.

[0073] By providing the space 62 filled with the grease 90 and the injection port 82 communicating with the space 62 in the cover 40 , the grease 90 can be applied between the shaft 31 and the holding portion 60 without removing the cover 40 from the shaft 31 .

[0074] In the present embodiment, the cover 40 is formed into a structure formed by connecting the first cover 41 and the second cover 42, but it is not limited to this, and the cover 40 may be a single cover, or may be formed by connecting three or more parts to each other. If the cover 40 is composed of the first cover 41 and the second cover 42, the first cover 41 and the second cover 42 can be easily manufactured by resin molding, and the cover 40 can be easily mounted on the shaft 31.

[0075] In this embodiment, the first roller 212 may have the same structure as the second roller 213. That is, the first roller 212 may include the shaft 31, the sprockets 50A, 50B, and the cover 40. In this case, the sprockets 50A, 50B and the cover 40 may not be provided on the second roller 213.

[0076] The embodiments of the present invention are described above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and may be implemented in various ways within the scope of the present invention. In addition, the multiple structural elements disclosed in the above embodiments may be appropriately changed. For example, a structural element of all the structural elements shown in a certain embodiment may be added to the structural elements of other embodiments, or several structural elements of all the structural elements shown in a certain embodiment may be deleted from the embodiment.

[0077] In addition, in order to facilitate the understanding of the invention, the drawings are schematically shown with each structural element as the main body, and in order to facilitate drawing the drawings, the thickness, length, number, spacing, etc. of each structural element shown in the drawings are sometimes different from the actual situation. In addition, the structure of each structural element shown in the above-mentioned embodiment is an example and is not particularly limited. Of course, various changes can be implemented within the scope that does not substantially deviate from the effect of the present invention.

[0078] Furthermore, the present technology can be configured as follows.

[0079] (1) A working vehicle, wherein:

[0080] The working vehicle has:

[0081] A traveling device, which travels on the field;

[0082] A traveling body, which is arranged above the traveling device;

[0083] a harvesting device, which is arranged on the traveling machine body and harvests the unharvested ear stalks in the field;

[0084] a threshing device for threshing the harvested stalks harvested by the harvesting device; and

[0085] a conveying device for conveying the cut ear stalks from the cutting device to the threshing device,

[0086] The conveyor device includes: an endless conveyor chain; and a rotating unit that rotates the conveyor chain while supporting the conveyor chain.

[0087] The rotating part includes: a shaft as a rotating shaft; and a cover covering the shaft in a circumferential direction of the shaft.

[0088] The cover has a holding portion that holds the shaft so as to be relatively rotatable.

[0089] (2) The work vehicle according to (1), wherein:

[0090] The cover comprises:

[0091] a first cover covering a portion of the shaft in the circumferential direction of the shaft; and

[0092] A second cover is connected to the first cover in the circumferential direction and covers another portion of the shaft.

[0093] (3) The work vehicle according to (2), wherein:

[0094] The first cover has: a first surface located at an end portion of the first cover in the circumferential direction and facing the second cover; and a first concave portion or a first convex portion arranged on the first surface.

[0095] The second cover has: a second surface facing the first surface; and a second convex portion or a second concave portion disposed on the second surface and engaged with the first concave portion or the first convex portion.

[0096] The first concave portion or the first convex portion is located at a position of at least one end of the first surface away from the end on the axis side and the end on the opposite side to the axis side.

[0097] The second recessed portion or the second projecting portion is located at a position away from at least one end of the second surface on the side close to the axis and the side close to the axis opposite to the axis.

[0098] (4) The work vehicle according to any one of (1) to (3), wherein:

[0099] The rotating portion includes: a supporting portion that supports the conveyor chain; and a protruding portion that extends from the supporting portion toward the center side of the shaft in the axial direction.

[0100] The protrusion is located inside the cover and at an end portion of the cover in the axial direction.

[0101] A communicating gap is formed between the support portion and the cover, and between the protrusion and the cover.

[0102] (5) The work vehicle according to (4) or (5), wherein:

[0103] In the axial direction, a distance between the retaining portion and the protrusion is smaller than a distance between an end surface of the cover and the support portion.

[0104] (6) The work vehicle according to (5), wherein:

[0105] In a radial direction of the shaft, a distance between the shaft and the retaining portion is smaller than a distance between the cover and the protrusion.

[0106] (7) The work vehicle according to any one of (1) to (6), wherein:

[0107] Filling grease between the shaft and the retaining portion,

[0108] The cover has an injection port for injecting the grease.

[0109] (8) The work vehicle according to any one of (1) to (7), wherein:

[0110] The conveying device further comprises a receiving portion for receiving the conveying chain and the rotating portion.

[0111] The shaft is rotatably mounted on the housing portion.

[0112] Possibility of Industrial Application

[0113] The present invention can be used in the field of work vehicles.

Claims

1. A working vehicle, characterized in that: The working vehicle has: A traveling device, which travels on the field; A traveling body, which is arranged above the traveling device; A harvesting device, which is arranged on the traveling machine body and harvests the unharvested ear stalks in the field; a threshing device for threshing the harvested stalks harvested by the harvesting device; and a conveying device for conveying the cut ear stalks from the cutting device to the threshing device, The conveying device comprises: an endless conveying chain; and a rotating part that rotates the conveyor chain while supporting the conveyor chain, The rotating part includes: a shaft as a rotating shaft; and a cover covering the shaft in a circumferential direction of the shaft, The cover has a holding portion that holds the shaft so as to be relatively rotatable.

2. The working vehicle according to claim 1, characterized in that: The cover comprises: a first cover covering a portion of the shaft in the circumferential direction of the shaft; and A second cover is connected to the first cover in the circumferential direction and covers another portion of the shaft.

3. The working vehicle according to claim 2, characterized in that: The first cover has: a first surface located at an end portion of the first cover in the circumferential direction and facing the second cover; and a first concave portion or a first convex portion arranged on the first surface. The second cover has: a second surface facing the first surface; and a second convex portion or a second concave portion disposed on the second surface and engaged with the first concave portion or the first convex portion. The first concave portion and the first convex portion are located at at least one end of the first surface away from the end on the axis side and the end on the opposite side to the axis side. The second recessed portion and the second protruding portion are located at a position away from at least one end of the second surface on the side of the axis and the side of the second surface opposite to the axis.

4. The working vehicle according to any one of claims 1 to 3, characterized in that: The rotating part includes: a supporting part that supports the conveyor chain; and a protruding part that extends from the supporting part toward the center side in the axial direction of the shaft. The protrusion is located inside the cover and at an end portion of the cover in the axial direction. A communicating gap is formed between the support portion and the cover, and between the protrusion and the cover.

5. The working vehicle according to claim 4, characterized in that: In the axial direction, a distance between the retaining portion and the protrusion is smaller than a distance between an end surface of the cover and the support portion.

6. The working vehicle according to claim 5, characterized in that: In a radial direction of the shaft, a distance between the shaft and the retaining portion is smaller than a distance between the cover and the protrusion.

7. The working vehicle according to any one of claims 1 to 3, characterized in that: Filling grease between the shaft and the retaining portion, The cover has an injection port for injecting the grease.

8. The working vehicle according to any one of claims 1 to 3, characterized in that: The conveying device further comprises a receiving portion for receiving the conveying chain and the rotating portion. The shaft is rotatably mounted on the housing portion.

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