JP2018183068A - Combine-harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combine-harvester capable of highly efficiently performing raking work by covering an attachment part between a tine support shaft and a tine by a cover and preventing an inner periphery part of the cover from being opened in the longitudinal direction.SOLUTION: A raking device (3A) for raking grain culms is provided in front of an auger device (3C) of a reaping pretreatment apparatus (3), tine support shafts (17) extending in a horizontal direction, with their spaced at prescribed intervals in a circumferential direction, are provided at an outer periphery part of a raking reel (10) of the raking device (3A), and tines (25) extending toward an inner peripheral part, with their spaced prescribed intervals in the horizontal direction are mounted on the tine support shafts (17). A cover (30) for covering a tine support shaft (17) and an attachment part (26) of the tine (25) is mounted thereon, and a lower part of a front cover (30A) and a lower part of a rear cover (30B) of the cover (30) are separably formed. After the cover (30) has been mounted thereon, the vicinities of the inner periphery parts of the front cover (30A) and the rear cover (30B) are connected by a connecting member (35).SELECTED DRAWING: Figure 4

Description

  The present invention relates to a combine equipped with a scraping device that scrapes overlying cereals and the like.

  In the conventional scraping device, a technique is known in which a plurality of tines are attached to a plurality of tine support shafts horizontally mounted on the outer peripheral portion of the scraping device at predetermined intervals in the left-right direction. (Patent Document 1)

JP 2014-143799 A

  However, in the technique of Patent Document 1, there is a problem that the squeezed cereals and the like are entangled with the tine support shaft and the attaching portion of the tine, and the tine is damaged by the entangled cereals and the like.

  Therefore, the main problem of the present invention is to combine the tine support shaft and the tine mounting portion with a cover, and to prevent the inner peripheral portion of the cover from being opened in the front-rear direction and to perform the scraping work efficiently. Is to provide.

The present invention that has solved the above problems is as follows.
The invention according to claim 1 is a combine provided with a cutting pretreatment device (3) on the front side of the threshing device (4).
A pre-cutting device (3) is provided with a scraping device (3A) for scraping the cereals on the front side of the auger device (3C), and on the outer periphery of the scooping reel (10) of the scraping device (3A). A tine support shaft (17) extending in the left-right direction at a predetermined interval in the circumferential direction is provided, and the tine support shaft (17) extends toward the inner peripheral portion at a predetermined interval in the left-right direction. A tine (25) is mounted, a cover (30) covering the tine support shaft (17) and the mounting portion (26) of the tine (25) is mounted, and a lower part of the front cover (30A) of the cover (30) And the lower part of the rear cover (30B) are formed so as to be separable, and after the cover (30) is mounted, the vicinity of the inner peripheral part of the front cover (30A) and the rear cover (30B) ) Is a combine that is characterized by being connected with a).

  The invention according to claim 2 is the combine according to claim 1, wherein the connecting member (35) is provided on both side portions of the cover (30) in the left-right direction.

  The invention according to claim 3 is the combine according to claim 2, wherein the connecting member (35) is provided at an intermediate portion in the left-right direction of the cover (30).

  According to a fourth aspect of the present invention, there is provided a first front connection piece (40) for fixing the connection member (35) in the vicinity of an inner peripheral portion of the front cover (30A), and an inner portion of the rear cover (30B). The first front and rear connecting pieces (42) engaged with the peripheral end, the first front and rear connecting the inner peripheral portion of the first front connecting piece (40) and the outer peripheral portion of the first rear connecting piece (42). It is a combine of any one of Claims 1-3 formed with the connection piece (41).

  According to a fifth aspect of the present invention, there is provided a second front connection piece (44) for fixing the connection member (35) in the vicinity of an inner peripheral portion of the front cover (30A), and an inner part of the rear cover (30B). A second rear connecting piece (46) fixed in the vicinity of the peripheral portion, a second front and rear connecting the inner peripheral portion of the second front connecting piece (44) and the outer peripheral portion of the second rear connecting piece (46). It is a combine of any one of Claims 1-3 formed with the connection piece (45).

  According to the first aspect of the present invention, the scraping device (3A) for scraping the culm is provided on the front side of the auger device (3C) of the pre-cutting processing device (3), and the scraping device (3A) is scraped. A tine support shaft (17) extending in the left-right direction with a predetermined interval in the circumferential direction is provided on the outer peripheral portion of the reel (10), and the tine support shaft (17) is provided with a predetermined interval in the left-right direction. A tine (25) extending toward the periphery is mounted, a tine support shaft (17) and a cover (30) covering the mounting portion (26) of the tine (25) are mounted, and a front cover of the cover (30) The lower part of (30A) and the lower part of the rear cover (30B) are formed to be separable, and after attaching the cover (30), the vicinity of the inner peripheral part of the front cover (30A) and the rear cover (30B) is connected. Since it is connected with the member (35), the stalks that have been squeezed into the tine support shaft (17) To prevent entangling on the mounting portion of the In (25) (26), it is possible to prevent deformation of the tines (25). Further, the front cover (30A) of the cover (30) and the inner periphery of the rear cover (30B) can be prevented from being opened in the front-rear direction by the hardened cereal etc., and the scraping work can be performed efficiently. .

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the connecting member (35) is provided on both sides in the left-right direction of the cover (30), the connecting member (35) is covered. (30) can be easily mounted.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 2, since the connecting member (35) is provided in the middle portion in the left-right direction of the cover (30), the front cover of the cover (30) (30A) and the opening of the inner periphery of the rear cover (30B) in the front-rear direction can be further prevented.

  According to the invention of claim 4, in addition to the effect of the invention of any one of claims 1 to 3, the connecting member (35) is fixed in the vicinity of the inner peripheral portion of the front cover (30A). The first front connection piece (40), the first rear connection piece (42) engaged with the inner peripheral end of the rear cover (30B), and the inner peripheral part of the first front connection piece (40) Since it formed with the 1st front-and-back connection piece (41) which connects the peripheral part of the 1st back side connection piece (42), a connection member (35) can be easily attached with a cover (30).

  According to the invention of claim 5, in addition to the effect of the invention of any one of claims 1 to 3, the connecting member (35) is fixed in the vicinity of the inner peripheral portion of the front cover (30A). A second front side connecting piece (44), a second rear side connecting piece (46) fixed in the vicinity of the inner peripheral part of the rear cover (30B), and an inner peripheral part of the second front side connecting piece (44) Since the second front and rear connecting pieces (45) that connect the outer peripheral part of the second rear connecting piece (46) are formed, the front cover (30A) of the cover (30) and the inner peripheral part of the rear cover (30B) Opening in the front-rear direction can be reliably prevented.

It is a right view of a combine. It is a left view of a cutting pretreatment apparatus. (A) is a front view of a tine support shaft, (b) is a bottom view of a cover. It is a right view of a cover using the connection member of a 1st embodiment. It is explanatory drawing at the time of mounting | wearing of a connection component. It is a right view of the cover using the connection member of 2nd Embodiment. It is a right view of the cover using the connection member of 3rd Embodiment. It is the left view which carried out the longitudinal cross-section of the feeder house. It is a top view of a removal apparatus. (A) of a Glen tank is a left view, (b) is a rear view. It is a right view of a control part and a Glen tank. It is a front view of a threshing device and a Glen tank.

  The present invention will be described with reference to the drawings. From the viewpoint of the pilot, the front side is the front side, the rear side is the rear side, the right hand side is the right side, and the left hand side is the left side.

  As shown in FIG. 1, the general-purpose combiner is provided with a traveling device 2 composed of a pair of left and right crawlers traveling on the soil surface on the lower side of the machine body frame 1, and harvesting cereals in the field on the front side of the machine body frame 1. A pre-treatment device 3 is provided, and a threshing device 4 for threshing and sorting the harvested cereals is provided on the rear left side of the pre-harvest pre-processing device 3, and a driver is provided on the rear right side of the pre-harvest pre-processing device 3. Is provided with a maneuvering unit 5.

  An engine room 6 on which the engine is mounted is provided at the lower part of the control unit 5, and a Glen tank 7 for storing the threshed and sorted grain is provided on the rear side of the control unit 5. On the rear side, a discharge cylinder 8 for discharging the grain to the outside is provided. The discharge tube 8 is formed of a vertical discharge tube that communicates with the lower rear portion of the Glen tank 7 and extends in the vertical direction, and a horizontal discharge tube that communicates with the upper portion of the vertical discharge tube and extends in the front-rear direction. Moreover, the lower part of the right wall of the threshing apparatus 4 and the upper part of the left wall of the Glen tank 7 are connected by the cerealing apparatus 9 which conveys a grain.

  The pre-harvest processing device 3 includes a scraping device 3A that rakes the grain culm in the field and conveys it to the rear, a cutting blade device 3B that cuts the stock of the cereal conveyed to the rear, and the rear The auger device 3C gathers the cereals conveyed to the left side to the left side, and the feeder house 3D that conveys the collected cereals to the threshing device 4.

<Scratching device>
As shown in FIG. 2, the picking device 3 </ b> A includes a picking reel 10, a rotating shaft 11 to which the picking reel 10 is fixed, a pair of left and right arms 12 that support both side portions of the rotating shaft 11, and the like. ing. In the axial view of the rotating shaft 11, the take-up reel 10 is formed in a regular pentagonal shape. The take-up reel 10 includes a pair of left and right support plates 15 fixed to both sides of the rotary shaft 11, five support arms 16 extending radially from the outer periphery of the support plate 15, and left and right support arms. It is composed of five tine support shafts 17 or the like that are horizontally disposed between the 16 tip portions. Further, the distal ends of the five support arms 16 are connected by a connecting plate 18. Thereby, the grain straw of a field can be efficiently weeded to the inner side and the outer side of the picking reel 10.

  As shown in FIG. 3, on each tine support shaft 17, a tine 25 formed of a resin or steel round bar is suspended at a predetermined interval in the left-right direction, and the upper portion of the tine 25 is made of resin. The cover 30 is covered. As a result, the cereals scraped by the scraping reel 10 can be prevented from being entangled with the upper portion of the tines 25. In addition, the distance between the three tines 25 hung on the left side of the tine support shaft 17 and the four tines 25 hung on the right side is divided between the eight tines 25 hung in the center. It is set narrower than the horizontal spacing. As a result, the cereal that has been weeded inside the take-up reel 10 by the connecting plate 18 can be efficiently taken.

  As shown in FIGS. 4 and 5, the tine support shaft 17 is provided with a hanging portion 20 at a predetermined interval in the left-right direction. The hanging part 20 extends downward from the front part of the outer peripheral part of the tine support shaft 17 and the plate-like front side plate part 20 </ b> A extending downward from the front part of the outer peripheral part of the tine support shaft 17. The plate-shaped rear side plate portion 20B, and the fastening means 20C for fastening the extending portions of the front side plate portion 20A and the rear side plate portion 20B are formed.

  The tine 25 includes a bending portion 25A that engages with the fastening means 20C of the hanging portion 20, an upper extending portion 25B that extends downward from the lower end portion of the bending portion 25A, and a lower end of the upper extending portion 25B. A circumferential portion 25C extending circumferentially from the portion and a lower extending portion 25D extending from the lower end portion of the circumferential portion 25C toward the lower rear portion are formed. Thereby, when an excessive external force is applied to the lower extending portion 25D from the cereal basket, the circumferential portion 25C can be deformed to prevent the tine 25 from being damaged.

  When the tine 25 is attached to the hanging portion 20, the bending portion 25 </ b> A of the tine 25 is engaged with the fastening means 20 </ b> C, and the bending portion 25 and the upper extending portion 25 </ b> B are connected to the front side plate portion 20 </ b> A of the hanging portion 20. It is sandwiched between the rear plate portions 20B. Thereby, the tine 25 can be efficiently mounted on the hanging portion 20, and the tine 25 can be prevented from falling off when the take-up reel 10 is driven.

  The tine support shaft 17 excluding both ends, the hanging portion 20, the curved portion 25A excluding the lower extending portion 25D of the tine 25, the upper extending portion 25B, and the circumferential portion 25C are made of a resin cover 30. Covered with. As a result, the cereals scraped by the scraping reel 10 can be prevented from being entangled with the tine support shaft 17, the hanging portion 20, the curved portion 25 </ b> A of the tine 25, and the like. In the present specification, the curved portion 25A, the upper extending portion 25B, and the circumferential portion 25C of the tine 25 are referred to as an attachment portion 26, and the lower extending portion 25D of the tine 25 is referred to as a scraping portion 27.

  In the axial view of the tine support shaft 17, the cover 30 extends downward from the tine support shaft 17, the front cover 30A covering the circumferential portion 25C of the tine 25, and the rear end portion of the front cover 30A. The rear cover 30B is formed, and the lower portions of the front cover 30A and the rear cover 30B are formed to be separable in the front-rear direction. Further, a notch 30C through which the tine 25 formed at a predetermined interval in the left-right direction is inserted at the rear end of the lower portion of the front cover 30A. Accordingly, the cover 30 can be easily attached to and detached from the tine support shaft 17 after the tine 25 is attached to the hanging portion 20 of the tine support shaft 17.

  The front cover 30 </ b> A and the rear cover 30 </ b> B of the cover 30 are preferably connected by a connecting member 35. This prevents the lower part of the front cover 30A and the rear cover 30B of the cover 30 from opening back and forth when the scraping reel 10 is driven, so that the trapped culm is entangled with the tine support shaft 17 and the like. Can be prevented. Moreover, the connection member 35 should just be provided in the left-hand side part and right side part of the left-right direction of the cover 30, according to the harvest condition, the center part of the left-right direction of the cover 30, the intermediate part of a left side part and a center part, It can be provided in the middle between the right side and the center. FIG. 3 shows a form in which the connecting member 35 is provided at the left side, the right side, and the center of the cover 30 in the left-right direction.

(Connecting member of the first embodiment)
The connecting member 35 of the first embodiment includes a front connecting piece (a “first front connecting piece” in the claims) 40 that extends along a straight portion at the bottom of the front cover 30A, and a lower end of the rear cover 30B. A rear connection piece (“first rear connection piece” in the claims) 42 formed in a substantially U-shape to be engaged, a lower end portion of the front connection piece 40 and a front upper end portion of the rear connection piece 42 are connected. A front and rear connecting piece (“first front and rear connecting piece” in the claims) 41 is formed, and a nut 40 </ b> A is fixed to the rear surface of the front connecting piece 40. In addition, in the axial view of the tine support shaft 17, the connecting member 35 is formed in a substantially horizontal L shape.

  When attaching the connecting member 35 to the cover 30, first, the connecting member 35 with the front connecting piece 40 facing upward is inserted into the cover 30 from the gap between the lower portions of the front cover 30 </ b> A and the rear cover 30 </ b> B. Next, the rear connecting piece 42 is engaged with the lower end portion of the rear cover 30B. Finally, the bolt inserted from the front side of the front cover 30A is fastened to the nut 40A. Thereby, the front side connecting piece 40 and the rear side connecting piece 42 of the connecting member 35 can be easily connected to the front side cover 30A and the rear side cover 30B, and the front side cover 30A and the rear side cover can be driven when the driving reel 10 is driven. It is possible to prevent the lower part of 30B from opening back and forth. In addition, when attaching / detaching the connecting member 35 from the cover 30, it is preferable to temporarily fix the vicinity of a portion of the cover 30 connected to the connecting member 35 with a resin band or the like in order to smoothly perform the attaching / detaching operation.

(Connecting member of the second embodiment)
Next, the connection member 35 of 2nd Embodiment is demonstrated. In addition, the same code | symbol is attached | subjected to the same components as the connection member 35 of 1st Embodiment, and description is abbreviate | omitted. As shown in FIG. 6, the connecting member 35 according to the second embodiment includes a front connecting piece (“second front connecting piece” in the claims) 44 extending along a straight portion at the bottom of the front cover 30 </ b> A, and a rear part. A rear connecting piece (a “second rear connecting piece” in the claims) 46 extending along a straight line portion at the bottom of the side cover 30B, a lower end portion of the front connecting piece 44, and an upper end portion of the rear connecting piece 46 The front connection piece 44 has a nut 44A fixed to the rear surface of the front connection piece 44 and the front surface of the rear connection piece 46 has a nut 46A. Is fixed. In addition, in the axial view of the tine support shaft 17, the connecting member 35 is formed in a substantially horizontal Z shape.

  When attaching the connecting member 35 to the cover 30, first, the connecting member 35 with the front connecting piece 44 facing upward is inserted into the cover 30 from the gap between the lower portions of the front cover 30 </ b> A and the rear cover 30 </ b> B. Next, a bolt inserted from the rear side of the rear cover 30B is fastened to the nut 46A. Finally, the bolt inserted from the front side of the front cover 30A is fastened to the nut 44A. As a result, the front side connecting piece 44 and the rear side connecting piece 46 of the connecting member 35 are securely connected to the front side cover 30A and the rear side cover 30B, and the connecting member 35 takes off due to the vibration generated when the scraping reel 10 is driven. It is possible to prevent the lower part of the front cover 30A and the rear cover 30B from opening back and forth when the take-up reel 10 is driven.

(Connection member of 3rd Embodiment)
Next, the connection member 35 of 3rd Embodiment is demonstrated. In addition, the same code | symbol is attached | subjected to the same components as the connection member 35 of 1st Embodiment, and description is abbreviate | omitted. As shown in FIG. 7, the connecting member 35 of the third embodiment is fixed to extend along the rear cover 30 </ b> A of the cover 30 after extending downward from the rear plate part 20 </ b> B of the hanging part 20. The rear connection piece 48, the front cover 30A of the cover 30 and the lower connection piece 49 that covers the lower part of the rear cover 30B from below are formed. A nut 48A is fixed to the front surface of the rear connection piece 48. . In addition, in the axial view of the tine support shaft 17, the lower connecting piece 49 is formed in a substantially U shape along the lower portions of the front cover 30A and the rear cover 30B.

  When attaching the connecting member 35 to the cover 30, first, the lower connecting piece 49 is attached to the lower portions of the front cover 30A and the rear cover 30B. Next, a bolt inserted from the rear side of the lower connecting piece 49 and the rear cover 30B is fastened to the nut 48A. Accordingly, the lower connecting piece 49 can be easily connected to the front cover 30A and the rear cover 30B, and the lower portions of the front cover 30A and the rear cover 30B can be opened back and forth when the driving reel 10 is driven. Can be prevented.

<Feeder house>
As shown in FIGS. 8 and 9, the feeder house 3 </ b> D is rotatably supported by a frame 50 formed in a substantially rectangular parallelepiped shape, and a support shaft 51 that is laterally provided in front of the left and right walls of the frame 50. The sprocket 52 is formed of a sprocket 54 fixed to a rotating shaft 53 provided laterally at the rear of the left and right walls of the frame 50, a chain 55 wound around the sprocket 52 and the sprocket 54, and the like. In addition, a slat 55 </ b> A that conveys the cereals backward at a predetermined interval is detachably fixed to the chain 55, and the rotation of the engine is transmitted to the rotary shaft 53.

  An outer cylinder 56 formed in a cylindrical shape covering the rotation shaft 53 is mounted between the sprockets 54 on the left and right sides of the rotation shaft 53. Further, the outer peripheral portion of the outer cylinder 56 faces the vicinity of the tooth bottom portion of the sprocket 54. Thereby, the entanglement to the rotating shaft 53, the sprocket 54, etc. of the cereals conveyed to the front side of the threshing device 4 by the feeder house 3D is prevented, and the cereals are efficiently transferred from the feeder house 3D to the threshing device 4. Can do.

  In the axial view of the rotary shaft 53, a removal device 60 that scrapes off the cereal tangled around the outer cylinder 56 is provided on the front side of the outer cylinder 56. The removing device 60 includes a support shaft 61 provided laterally on the rear portions of the left and right walls of the frame body 50, and a front frame 62 extending rearward from a plate-like attachment portion 61 </ b> A fixed to the upper portion of the support shaft 61. And a rear frame 63 extending from the connecting portion 62A formed at the rear portion of the horizontal frame 62 toward the rear side.

  In plan view, the connecting portion 62 is formed in an inverted U shape with the rear side released, and the rear frame 63 is formed from the upper plate 63A extending in the front-rear direction and the left and right sides of the upper plate 63A. It is formed from a side plate 63B extending toward the side.

  An opening is formed in the rear portion of the front frame 62 so as to be movable in the front-rear direction and the left-right direction with respect to the attachment portion 61A. Further, an opening is formed in the side plate 63B of the rear frame 63 so as to be movable in the vertical direction with respect to the connecting portion 62. As a result, the front frame 62 and the rear frame 63 are moved so that the rear end portion of the upper plate 63A of the rear frame 63 faces the outer peripheral portion of the outer cylinder 56, and the grains entangled with the outer peripheral portion of the outer cylinder 56 Can efficiently scrape off the firewood.

<Glentank>
As shown in FIG. 10, in order to increase the storage capacity of the Glen tank 7, a front overhanging portion 70 that projects toward the front side is formed on the front wall, and a left extension that projects toward the left side at the rear portion of the left wall. A projecting portion 71 is formed, and an upper projecting portion 72 that projects upward on the upper wall is formed. In FIG. 12, the front overhanging portion 70, the left overhanging portion 71, and the upper overhanging portion 72 are shown with a dod.

  As shown in FIGS. 11 and 12, the front end portion of the front projecting portion 70 is the rear portion of the support frame 76 that supports an air cleaner 75 that removes impurities in the air supplied to the engine disposed at the rear portion of the control portion 5. It faces.

  The front end portion of the left overhanging portion 71 is formed to have a downward descending slope in order to arrange the second cerealing device that conveys the second thing threshed and sorted by the threshing device 4 to the sorting processing of the threshing device 4. ing. In addition, drying of the grains stored in the glen tank 7, particularly the left overhanging portion 71, is promoted by heat radiation from the tail pipe that discharges exhaust gas discharged from the engine to the outside.

  The overhanging portion 72 is disposed on the side of the upper end portion of the precleaner 77 that removes dust in the air supplied to the air cleaner 75 and above the air suction port of the precleaner 77. Thereby, it is possible to prevent the overhanging portion 72 of the Glen tank 7 from colliding with external trees and the like, and to suck in air that does not contain sawdust cut by the precleaner 77. Can do. Furthermore, a support member for supporting the precleaner 77 on the upper part of the cerealing device 9 can be formed in a compact manner, and the sun visor frame can be formed in a compact manner by attaching the rear portion of the sun visor frame of the sun visor to the overhanging portion 72. Can do.

DESCRIPTION OF SYMBOLS 3 Cutting pretreatment apparatus 3A Stake apparatus 3C Auger apparatus 4 Threshing apparatus 10 Stake reel 17 Tine support shaft 25 Tine 26 Attachment part 30 Cover 30A Front cover 30B Rear cover 35 Connection member 40 Front connection piece (1st front connection piece )
41 Front and rear connecting pieces (first front and rear connecting pieces)
42 Rear connection piece (first rear connection piece)
44 Front connection piece (2nd front connection piece)
45 Front / rear connecting piece (second front / rear connecting piece)
46 Rear connection piece (second rear connection piece)

Claims (5)

In a combine provided with a pre-cutting device (3) on the front side of the threshing device (4),
On the front side of the auger device (3C) of the pre-harvest processing device (3), a scraping device (3A) for scraping the cereals is provided,
A tine support shaft (17) extending in the left-right direction at a predetermined interval in the circumferential direction is provided on the outer periphery of the scraping reel (10) of the scraping device (3A),
The tine support shaft (17) is mounted with a tine (25) extending toward the inner periphery at a predetermined interval in the left-right direction,
A cover (30) covering the attachment portion (26) of the tine support shaft (17) and the tine (25) is mounted,
The lower part of the front cover (30A) and the lower part of the rear cover (30B) of the cover (30) are formed to be separable,
The combine characterized by connecting the vicinity of the inner peripheral part of the front cover (30A) and the rear cover (30B) with a connecting member (35) after mounting the cover (30).   The combine of Claim 1 which provided the said connection member (35) in the both sides of the left-right direction of a cover (30).   The combine of Claim 2 which provided the said connection member (35) in the intermediate part of the left-right direction of the cover (30).   A first front connection piece (40) for fixing the connection member (35) in the vicinity of the inner peripheral portion of the front cover (30A), and a first engagement portion engaged with the inner peripheral end portion of the rear cover (30B). 1 rear side connection piece (42) and the 1st front and back connection piece (41) which connects the inner peripheral part of the 1st front side connection piece (40), and the outer periphery part of the 1st rear side connection piece (42). The combine according to any one of claims 1 to 3.   A second front connection piece (44) for fixing the connection member (35) in the vicinity of the inner peripheral portion of the front cover (30A), and a second portion for fixing the connection member (35) in the vicinity of the inner peripheral portion of the rear cover (30B). 2 rear connection pieces (46), and the second front and rear connection pieces (45) that connect the inner periphery of the second front connection piece (44) and the outer periphery of the second rear connection piece (46). The combine according to any one of claims 1 to 3.

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