Combine harvester

Abstract

To provide a combine harvester that can readily open a waste straw transport device.SOLUTION: A combine harvester includes: a waste straw frame 50 that supports a waste straw transport device 12 and can vertically rocking about a rocking shaft center Y2 extending in a machine body longitudinal direction across from a descent position where the waste straw transport device 12 transports waste straw to an ascent position where the waste straw transport device 12 does not transport waste straw; and a belt transmission mechanism 53 for transmitting power to an input shaft of the waste straw transport device 12. The belt transmission mechanism 53 includes: a drive pulley 54; a driven pulley 55; and a transmission belt 56 looped around the drive pulley 54 and the driven pulley 55.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a combine harvester including a feed chain for clamping and conveying harvested cereal straws, a threshing device for threshing the harvested cereal straws conveyed by the feed chain with a handling cylinder, and a straw discharge conveying device connected to the rear side of the threshing device for receiving the straws after threshing from the feed chain and clamping and conveying them rearward.

Background Art

[0002] As such a combine harvester, for example, the combine harvester described in Patent Document 1 is already known. The combine harvester described in Patent Document 1 includes a feed chain (referred to as "threshing feed chain" in the document) for clamping and conveying harvested cereal straws, a threshing device (referred to as "thresher" in the document) for threshing the harvested cereal straws conveyed by the feed chain with a handling cylinder (referred to as "handling cylinder" in the document), and a straw discharge conveying device (referred to as "straw discharge conveying device" in the document) connected to the rear side of the threshing device for receiving the straws after threshing from the feed chain and clamping and conveying them rearward. An upper cover (referred to as "handling cylinder cover" in the document) for covering the handling cylinder from above is provided above the handling cylinder. The upper cover is configured to swing open and close with one side of the handling chamber as a fulcrum. The straw discharge conveying device is configured to swing up and down with a rotation axis in the front-rear direction as a fulcrum. According to such a configuration, by swinging the upper cover and the straw discharge conveying device upward respectively, the upper cover and the straw discharge conveying device are opened, so that maintenance work can be easily performed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the combine harvester described in Patent Document 1, the upper cover and the straw conveyor must be opened separately, and the opening must be performed manually, which is troublesome.

[0005] In view of the above situation, there is a demand for a combine harvester that can easily open the upper cover and the straw conveyor.

Means for Solving the Problem

[0006] The features of the present invention are a feed chain that sandwiches and conveys the cut crop straws, a threshing device that threshes the cut crop straws conveyed by the feed chain with a threshing cylinder, a combine harvester provided with a straw conveyor that is connected to the rear side of the threshing device and that receives the straws after threshing from the feed chain and sandwiches and conveys them rearward, Front a straw frame that supports the straw conveyor and that can swing up and down around the swing axis between a lowered position where the straw conveyor conveys the straws and a raised position where the straw conveyor does not convey the straws, A belt transmission mechanism that transmits power to the input shaft of the straw discharging and conveying device, and is provided with The belt transmission mechanism includes a driving pulley, a driven pulley, and a transmission belt wound around the driving pulley and the driven pulley. this is the case.

[0007]

[0008] Furthermore, in the present invention, The driving pulley is arranged on the rocking axis. is preferable.

[0009]

[0010] Furthermore, in the present invention, The belt transmission mechanism is configured to be vertically swingable together with the straw discharging frame. is preferable.

[0011]

[0012] Furthermore, in the present invention, The straw discharging and conveying device is provided so as to intersect the rocking axis in a plan view. is preferable.

[0013]

[0014]

[0015] Furthermore, in the present invention, Among the straw discharging and conveying device, a conveying start-end side portion located on the conveying start-end side with respect to the rocking axis and a conveying end-side portion located on the conveying end side are configured to be vertically swingable around the rocking axis together with the straw discharging frame, and when the conveying start-end of the conveying start-end side portion rises, the conveying end of the conveying end-side portion is configured to descend, The driven pulley is supported by the conveying start-end side portion. is suitable.

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

Brief Description of the Drawings

[0023]

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Mode for Carrying Out the Invention

[0024] 〔Overall Configuration of Combine〕 Figures 1 and 2 show a self-threshing combine. This combine includes a machine body frame 1 and a traveling device 2 that supports the machine body frame 1. A driver's cab 3 is provided on the right side at the front of the machine body. The driver's cab 3 includes a driving section 4 on which a driver boards and a cab 5 that covers the driving section 4. An engine (not shown) is provided below the driving section 4.

[0025] In front of the driver's cab 3, a harvesting unit 6 for harvesting the crops in the field is provided. Behind the driver's cab 3, a grain storage tank 7 for storing grains is provided. A grain discharging device 8 for discharging the grains in the grain storage tank 7 is provided. On the left side of the machine body, a feed chain 9 for clamping and conveying the cut grain straws is provided. On the left side of the grain storage tank 7, a threshing device 10 is provided. The threshing device 10 threshes the cut grain straws conveyed by the feed chain 9 with a threshing cylinder 11. On the rear side of the threshing device 10, a straw discharging and conveying device 12 is connected. The straw discharging and conveying device 12 receives the straws after threshing from the feed chain 9 and clamps and conveys them rearward.

[0026] 〔Harvesting Unit〕 The harvesting unit 6 is configured for a multi-cut specification (for example, a six-row cut specification). The harvesting unit 6 includes a plurality (for example, seven) of weed separating tools 13, a plurality (for example, six) of lifting devices 14, a cutting device 15, and a conveying device 16. The weed separating tools 13 separate the weeds of the crops in the field. The lifting devices 14 lift the separated crops. The cutting device 15 cuts the lifted crops. The conveying device 16 conveys the cut crops rearward toward the threshing device 10.

[0027] 〔Threshing Device, etc.〕 As shown in FIG. 3, an operation chamber 17 is formed above the threshing device 10. The threshing cylinder 11 is provided in the operation chamber 17. The threshing cylinder 11 is rotatable around a rotation axis Y1 extending in the longitudinal direction of the machine body. Below the threshing cylinder 11, a receiving net 18 is provided. Behind the operation chamber 17, a dust exhaust fan 19 for discharging dust to the outside is provided.

[0028] Below the threshing device 10, a rocking sorting device 20 for sieving and sorting while transferring the objects to be sorted rearward of the machine body, a winnowing basket 21 for blowing sorting air to the rocking sorting device 20, a first recovery part 22 for recovering the first-class grains (such as single-grained grains), a second recovery part 23 for recovering the second-class grains (such as grains with branches), etc. are provided.

[0029] In the first recovery section 22, a first screw 24 for conveying the first-class grains to the right is provided. At the right end of the first screw 24, a winnowing device 25 for winnowing and conveying the first-class grains to the grain storage tank 7 is linked and connected.

[0030] In the second recovery section 23, a second screw 26 for conveying the second-class grains to the right is provided. At the right end of the second screw 26, a second reduction device 27 for reducing the second-class grains to the oscillating sorting device 20 is linked and connected.

[0031] Below the rear part of the straw conveying device 12, a straw cutting device 28 for cutting the straw conveyed by the straw conveying device 12 is provided. A cover 29 for covering the straw cutting device 28 is provided. A switching plate 29a is provided at a portion of the cover 29 located above the straw cutting device 28. The switching plate 29a can swing open and close between an ascending cutting position and a descending non-cutting position around a swing axis extending in the left-right direction of the machine body. In a state where the switching plate 29a is open (the cutting position state), the straw conveyed by the straw conveying device 12 is introduced into the straw cutting device 28. In a state where the switching plate 29a is closed (the non-cutting position state), the straw conveyed by the straw conveying device 12 slides on the upper surface of the switching plate 29a and falls to the ground.

[0032] As shown in FIGS. 3 to 7, wall portions 30 are provided at the front end portion and the rear end portion in the handling chamber 17, respectively. The front wall portion 30 constitutes the front wall portion of the handling chamber 17. The rear wall portion 30 constitutes the rear wall portion of the handling chamber 17. The wall portion 30 includes a movable wall 31 and a fixed wall 32. The handling cylinder 11 is rotatably supported by the movable wall 31 via a handling cylinder shaft 11a. A connecting arm 33 for connecting these is provided across the movable wall 31 and the fixed wall 32. The movable wall 31 is supported by the fixed wall 32 so as to be vertically swingable around a swing axis Y2 extending in the front-rear direction of the machine body via the connecting arm 33. A transmission shaft 34 to which the power of the engine is transmitted is provided across the front fixed wall 32 and the rear fixed wall 32.

[0033] The right side of the threshing device 10 is constituted by the right side wall 35. The right side wall 35 extends to the rear end of the machine body. The right side wall 35 is provided with an inclined portion 35a. The inclined portion 35a is inclined so as to be located closer to the center in the left-right direction of the machine body toward the rear side at the rear side than the rear wall portion 30.

[0034] On both the left and right sides of the threshing device 10 in the machine body longitudinal direction, front-rear frames 36L and 36R extending in the front-rear direction of the machine body are respectively provided. The left front-rear frame 36L extends to the rear side beyond the rear end of the handling cylinder 11. The left front-rear frame 36L is constituted by a square pipe having a substantially square cross-sectional shape. The right front-rear frame 36R extends to the rear side beyond the rear end of the handling cylinder 11. The right front-rear frame 36R supports the front fixed wall 32, the rear fixed wall 32, and the right side wall 35. The right front-rear frame 36R is constituted by a square pipe having a substantially rectangular cross-sectional shape (a substantially horizontally long rectangular shape).

[0035] 〔Rear Frame〕 A rear frame 37 is provided at the upper rear part of the machine body. The rear frame 37 is located outside the machine body in the left-right direction of the machine body in the threshing device 10. The rear frame 37 is formed in a substantially U-shaped form that protrudes rearward from the rear part of the threshing device 10 in a side view. The rear frame 37 is constituted by a round pipe.

[0036] 〔Upper Cover〕 An upper cover 38 that covers the handling cylinder 11 from above is provided. The upper cover 38 extends above the rear part of the straw discharging and conveying device 12 at the rear side of the rear end of the handling cylinder 11. A right upper cover 39 is provided adjacent to the right side of the upper cover 38. The right upper cover 39 extends above the rear part of the straw discharging and conveying device 12 at the rear side of the rear end of the handling cylinder 11. The right upper cover 39 is supported by the right front-rear frame 36R so as to be vertically swingable around a swing axis extending in the front-rear direction of the machine body.

[0037] 〔Upper Frame〕 The upper cover 38 is supported by the upper frame 40. The upper frame 40 is swingable up and down about the transmission shaft 34 extending in the longitudinal direction of the machine body. The upper frame 40 is supported by the front wall portion 30 and the rear wall portion 30 so as to be swingable up and down about the swing axis Y2 via the transmission shaft 34. The upper frame 40 includes a pair of front and rear movable walls 31 and a left front-rear frame 36L. The left front-rear frame 36L is located outside the machine body in the left-right direction of the machine body among the upper frames 40.

[0038] A hydraulic cylinder 41 for swinging the upper frame 40 upward is provided. The hydraulic cylinder 41 is provided across the rear movable wall 31 and the rear fixed wall 32. The hydraulic cylinder 41 is constituted by, for example, a double-acting hydraulic cylinder. However, the hydraulic cylinder 41 may be constituted by a single-acting hydraulic cylinder.

[0039] 〔Handling cylinder locking mechanism〕 The handling cylinder 11 can be swung upward by the hydraulic cylinder 41 together with the upper frame 40. A handling cylinder locking mechanism 42 for holding the handling cylinder 11 in position at the threshing position where threshing processing is performed is provided. The handling cylinder locking mechanism 42 includes a pair of front and rear hook plates 43 and a pair of front and rear handling cylinder hook pins 44. Each of the front wall portion 30 and the rear wall portion 30 supports the hook plate 43 so as to be swingable about the swing axis Y3 in the longitudinal direction of the machine body. A hook portion 43a engageable with the handling cylinder hook pin 44 is provided at the tip of the hook plate 43. When the hook portion 43a engages with the handling cylinder hook pin 44, the handling cylinder 11 is held in position at the threshing position. When the engagement of the hook portion 43a with the handling cylinder hook pin 44 is released, the handling cylinder 11 swings upward by the hydraulic cylinder 41 together with the upper frame 40. A motor M for swing-driving the pair of front and rear hook plates 43 is supported on the rear surface of the rear wall portion 30. By the motor M, the pair of front and rear hook plates 43 are swung to the engagement side and the engagement release side.

[0040] 〔Straw discharging and conveying device〕 As shown in FIGS. 6 and 7, the straw discharging and conveying device 12 is provided in an inclined state so as to be located closer to the center on the left and right sides of the machine body toward the rear side. The straw discharging and conveying device 12 includes a base conveying device 45 that sandwiches and conveys the base side of the straw, and a tip conveying device 46 that locks and conveys the tip side of the straw. The base conveying device 45 includes a straw discharging chain 47 with protrusions 47a and a straw discharging rail 48. The straw discharging rail 48 is disposed below the straw discharging chain 47 in a state of facing the lower path of the straw discharging chain 47. The tip conveying device 46 includes a straw discharging tip chain 49 with tines 49a.

[0041] The straw discharging and conveying device 12 is supported by a straw discharging frame 50. The straw discharging and conveying device 12 is detachable from the straw discharging frame 50. The straw discharging and conveying device 12 is suspended and supported by the straw discharging frame 50 via a front stay 51 and a rear stay 52. The straw discharging and conveying device 12 is detachably bolted to the front stay 51. The straw discharging and conveying device 12 is detachably bolted to the rear stay 52.

[0042] The straw discharging and conveying space S of the straw discharging and conveying device 12 is formed behind the rear wall portion 30. The straw discharging and conveying space S is formed so as to straddle the straw discharging frame 50 in the front-rear direction of the machine body. In plan view, the straw discharging and conveying space S spreads so as to be located closer to the center on the left and right sides of the machine body toward the downstream side in the conveying direction at the middle portion in the front-rear direction of the straw discharging and conveying space S (the portion corresponding to the front end of the inclined portion 35a).

[0043] 〔Belt Transmission Mechanism〕 As shown in FIGS. 6, 8, and 9, a belt transmission mechanism 53 for transmitting the power of the transmission shaft 34 to the straw discharging and conveying device 12 is provided across the transmission shaft 34 and the straw discharging and conveying device 12. The belt transmission mechanism 53 includes a driving pulley 54, a driven pulley 55, and a transmission belt 56. The driving pulley 54 is fixed to a portion of the transmission shaft 34 that protrudes rearward from the rear fixed wall 32. The driven pulley 55 is fixed to an input shaft (not shown) of the straw discharging and conveying device 12. The transmission belt 56 is wound around the driving pulley 54 and the driven pulley 55.

[0044] 〔Tension Clutch Mechanism〕 A tension clutch mechanism 57 is provided for switching the belt transmission mechanism 53 between a transmission state in which power is transmitted to the straw discharging and conveying device 12 and a blocking state in which the transmission of power to the straw discharging and conveying device 12 is blocked. The tension clutch mechanism 57 includes a first tension arm 58, a first tension roller 59, a second tension arm 60, a second tension roller 61, and a tension spring 62. The first tension arm 58 is rotatably supported by the transmission shaft 34. A first tension roller 59 is rotatably supported at the tip of the first tension arm 58. The first tension roller 59 is in contact with the portion of the transmission belt 56 corresponding to the lower path from above. An attachment portion 63 to which the tension spring 62 is attached is provided at the base end of the first tension arm 58.

[0045] The second tension arm 60 is fixed to the first tension arm 58 so as to be integrally rotatable with the first tension arm 58. A second tension roller 61 is rotatably supported at the tip of the second tension arm 60. The second tension roller 61 is in contact with the portion of the transmission belt 56 corresponding to the upper path from above.

[0046] The tension spring 62 biases the first tension arm 58 and the second tension arm 60 to swing in the tension application direction around the swing axis Y2. The end of the tension spring 62 opposite to the attachment portion 63 is attached to the rod 64. The rod 64 is supported by the stay 65 so that its position can be adjusted. The stay 65 is fixed (for example, welded) to the straw discharging frame 50 (front frame 67). By adjusting the position of the rod 64 with respect to the stay 65, the biasing force of the tension spring 62 changes.

[0047] 〔Straw Discharging Frame〕 As shown in FIGS. 6 to 11, the straw discharge frame 50 supports the front and rear portions of the straw discharge conveying device 12 via the front stay 51 and the rear stay 52. The straw discharge frame 50 is formed in a frame shape. The straw discharge frame 50 includes a base end frame 66, a front frame 67, a rear frame 68, and a free end frame 69. A single round pipe is bent to form the front frame 67, the rear frame 68, and the free end frame 69. The front portion of the straw discharge conveying device 12 is supported by the free end frame 69 via the front stay 51. The rear portion of the straw discharge conveying device 12 is supported by the portion on the left - right center side of the rear frame 68 via the rear stay 52.

[0048] The straw discharge frame 50 can swing up and down around the swing axis Y2 over the lowering position where the straw discharge conveying device 12 conveys straw and the raising position where the straw discharge conveying device 12 does not convey straw. The straw discharge frame 50 can swing up and down about a support shaft 70 extending in the longitudinal direction of the machine body. A pair of front - rear gas dampers 71 for swinging the straw discharge frame 50 upward are provided. The gas damper 71 is provided across the straw discharge frame 50 (front frame 67) and the lower stay 72. An upper stay 73 to which the gas damper 71 is connected is fixed (for example, welded) to the front frame 67.

[0049] As shown in FIGS. 12 to 14, the base end frame 66 is provided on the base end side of the straw discharge frame 50 and extends in the longitudinal direction of the machine body. The base end frame 66 includes a front - side frame portion 74 constituting the front portion side, a rear - side frame portion 75 constituting the rear portion side, and a connecting frame portion 76 extending across the front - side frame portion 74 and the rear - side frame portion 75. The front - side portion (front - side frame portion 74) of the base end frame 66 is supported by the support shaft 70 via a pair of front - rear stays 77.

[0050] At the location of the base frame 66 corresponding to the connecting frame portion 76, a stepped portion 66a that drops downward is formed. The connecting frame portion 76 includes a groove-shaped plate 78 that opens downward and a connecting plate 79. The groove-shaped plate 78 is provided across the lower surfaces of the front-side frame portion 74 and the rear-side frame portion 75. Inside the groove-shaped plate 78, a connecting plate 79 that connects the left and right side walls of the groove-shaped plate 78 is provided across these walls.

[0051] The front frame 67 is connected to the front end portion of the base frame 66 and extends outward from the side of the support shaft 70 in the left-right direction of the machine body. The rear frame 68 is connected to the rear end portion of the base frame 66 and extends outward from the side of the support shaft 70 in the left-right direction of the machine body.

[0052] The free-end frame 69 is provided on the free-end side of the straw discharging frame 50 and extends in the front-rear direction of the machine body. The free-end frame 69 is connected to the outer end portion in the left-right direction of the machine body of the front frame 67 and the outer end portion in the left-right direction of the machine body of the rear frame 68. In the lowered position, the free-end frame 69 extends along the left front-rear frame 36L and is adjacent to the left front-rear frame 36L in a state of being located to the right of the left front-rear frame 36L.

[0053] The support shaft 70 is a shaft separate from the transmission shaft 34 and is supported by the right front-rear frame 36R that supports the transmission shaft 34. The transmission shaft 34 and the support shaft 70 are arranged on the same axis (oscillation axis Y2). The support shaft 70 is arranged on the front side of the midpoint in the front-rear direction of the straw discharging and conveying space S (the location corresponding to the front end of the inclined portion 35a). The right front-rear frame 36R extends to the rear side of the support shaft 70. The support shaft 70 is supported by a bracket 81 via a pair of front and rear stays 80. The bracket 81 is vertically provided on the lower surface of the right front-rear frame 36R. The stay 80 is bolt-fixed to the bracket 81. The lower stay 72 is supported by the front stay 80.

[0054] 〔Positioning mechanism〕 As shown in FIG. 14, in a state where the straw discharge frame 50 is in the lowered position, a positioning mechanism 82 is provided to position the free end side (free end frame 69) of the straw discharge frame 50 with respect to the rear frame 37 so that the straw discharge frame 50 does not shift (shift in the longitudinal direction of the machine body or the like). The positioning mechanism 82 includes a claw portion 83 and a portion 84 into which the claw portion 83 is inserted. The claw portion 83 is supported by the free end frame 69 via a stay 85. The claw portion 83 is removably fixed to the stay 85 by a bolt 86. The inserted portion 84 is fixed (for example, welded) to the rear frame 37. When the claw portion 83 is inserted into the inserted portion 84, the free end side (free end frame 69) of the straw discharge frame 50 is positioned with respect to the rear frame 37 so that the straw discharge frame 50 does not shift (shift in the longitudinal direction of the machine body or the like) in a state where the straw discharge frame 50 is in the lowered position.

[0055] 〔Connecting mechanism〕 As shown in FIGS. 14 and 15, a connecting mechanism 87 is provided to connect the upper frame 40 (the left front-rear frame 36L) and the straw discharge frame 50 (the free end frame 69) in a releasable manner. The connecting mechanism 87 can connect the left front-rear frame 36L and the end portion (free end frame 69) on the outer side of the machine body in the left-right direction of the straw discharge frame 50. The connecting mechanism 87 is provided across the upper part of the left front-rear frame 36L and the upper part of the free end frame 69. The connecting mechanism 87 includes an upper side fixing bracket 88, a straw discharge side fixing bracket 89, and a connecting bracket 90. The upper side fixing bracket 88 is fixed (for example, welded) to the left front-rear frame 36L. The straw discharge side fixing bracket 89 is fixed (for example, welded) to the front part of the free end frame 69. The connecting bracket 90 is provided across the upper surfaces of the upper side fixing bracket 88 and the straw discharge side fixing bracket 89. The connecting bracket 90 is releasably connected to each of the upper side fixing bracket 88 and the straw discharge side fixing bracket 89 by a bolt 91. That is, the connecting mechanism 87 is releasable with respect to each of the left front-rear frame 36L and the free end frame 69.

[0056] 〔Inner Lock Mechanism〕 As shown in FIGS. 16 and 17, in a state where the straw discharging frame 50 is in the lowered position, an inner lock mechanism 92 is provided for holding the proximal end side (proximal end frame 66) of the straw discharging frame 50 in position on the right front-rear frame 36R. The inner lock mechanism 92 holds the rear portion side of the proximal end frame 66 in position on the right front-rear frame 36R. The inner lock mechanism 92 includes an inner hook 93 and an inner hook pin 94.

[0057] The inner hook 93 is removably fixed to the right side wall of the connecting frame portion 76 (grooved plate 78) of the proximal end frame 66 by bolts 95. The inner hook 93 includes a pair of front and rear hook portions 93a. A connecting plate 93b for connecting the front hook portion 93a and the rear hook portion 93a is provided across them.

[0058] The inner hook pin 94 is supported on the right front-rear frame 36R via a first stay 96 and a second stay 97. The first stay 96 is fixed (for example, by welding) to the right front-rear frame 36R. The second stay 97 is removably fixed to the first stay 96 by bolts 98. The inner hook pin 94 is provided across the front wall portion and the rear wall portion of the second stay 97.

[0059] 〔Operation of Inner Lock Mechanism〕 The inner lock mechanism 92 engages with the right front-rear frame 36R following the swing of the straw discharging frame 50 to the lowered position side, and releases the engagement with the right front-rear frame 36R following the swing of the straw discharging frame 50 to the raised position side.

[0060] Specifically, as the straw discharge frame 50 swings downward, the inner hook 93 engages with the inner hook pin 94. Then, as the straw discharge frame 50 swings upward, the engagement of the inner hook 93 with respect to the inner hook pin 94 is released. Here, when the straw discharge frame 50 swings from the lowered position to the raised position, the inner hook pin 94 enters into the stepped portion 66a. Thereby, when the straw discharge frame 50 swings up and down, the base frame 66 does not interfere with the inner hook pin 94.

[0061] 〔Outer locking mechanism〕 As shown in FIGS. 18 and 19, in a state where the straw discharge frame 50 is in the lowered position, an outer locking mechanism 100 for holding the free end side (free end frame 69) of the straw discharge frame 50 in position on the rear frame 37 is provided. The outer locking mechanism 100 includes an outer hook 101 and an outer hook pin 102. The outer hook 101 includes a base portion 101a and a hook portion 101b. The hook portion 101b is removably fixed to the base portion 101a by a bolt 103.

[0062] The outer hook pin 102 is disposed at a position slightly separated from the rear frame 37 to the left of the rear frame 37. The outer hook pin 102 is supported by the rear frame 37 via a first stay 104 and a second stay 105 (see FIG. 14).

[0063] The outer lock mechanism 100 holds the rear part of the left front-rear frame 36L in position on the rear frame 37. The left front-rear frame 36L and the rear frame 37 are connected by the outer lock mechanism 100 in a releasable manner. With the left front-rear frame 36L and the rear frame 37 connected by the outer lock mechanism 100, the rear frame 37 is positioned to the immediate right of the left front-rear frame 36L. That is, the rear frame 37 is provided with a portion adjacent to the left front-rear frame 36L in a state of being connected to the left front-rear frame 36L by the outer lock mechanism 100. With the left front-rear frame 36L and the rear frame 37 connected by the outer lock mechanism 100, the free end frame 69 is in contact with the rear frame 37 in the vertical direction. Specifically, with the left front-rear frame 36L and the rear frame 37 connected by the outer lock mechanism 100, the free end frame 69 is in contact with the rear frame 37 from above. That is, the free end frame 69 is sandwiched in the vertical direction between the rear frame 37 and the connection mechanism 87 (the straw discharge side fixing bracket 89) (a sandwich structure).

[0064] 〔Link mechanism〕 As shown in FIGS. 6 to 9, a link mechanism 106 is provided for interlocking and connecting the handling cylinder lock mechanism 42 (the rear hook plate 43) and the outer lock mechanism 100 (the outer hook 101). The link mechanism 106 includes a first link arm 107, a second link arm 108, and a link rod 109. The first link arm 107 is connected to the base end portion of the rear hook plate 43 so as to be relatively swingable. The first link arm 107 and the second link arm 108 are connected so as to be relatively swingable.

[0065] The link rod 109 is supported by the front and rear frames 36L on the left side via the front stay 110 and the rear stay 111. The link rod 109 is rotatably supported by the front stay 110 and the rear stay 111. A second link arm 108 is non-relative-rockably connected to the front end portion of the link rod 109. An outer hook 101 is non-relative-rockably connected to the rear end portion of the link rod 109.

[0066] 〔Lifting and lowering operation unit〕 As shown in FIG. 20, a lifting and lowering operation unit 112 for lifting and lowering operations is provided in the operation unit 4. The lifting and lowering operation unit 112 includes a power switch 113, a raising switch 114, and a lowering switch 115. When performing a raising operation, the raising switch 114 and the power switch 113 are simultaneously pressed. The raising operation is performed only while the raising switch 114 and the power switch 113 are simultaneously pressed. When performing a lowering operation, the lowering switch 115 and the power switch 113 are simultaneously pressed. The lowering operation is performed only while the lowering switch 115 and the power switch 113 are simultaneously pressed. The lifting and lowering operation unit 112 may be provided, for example, on the left side of the threshing device 10 so that an operator can operate it from outside the machine in addition to (or instead of) the operation unit 4.

[0067] 〔Rear upper cover〕 As shown in FIGS. 2, 6, 23, and 24, a rear upper cover 116 that covers the straw discharging and conveying device 12 from the rear upper side is provided. The rear upper cover 116 includes a main body portion 117 and an upper portion 118.

[0068] The main body portion 117 has a notch 117a that opens forward. The notch 117a is formed in a substantially trapezoidal shape that is horizontally long in plan view. The length of the front edge of the notch 117a (the length in the left-right direction of the machine body) is longer than the length of the rear edge of the notch 117a (the length in the left-right direction of the machine body).

[0069] The upper part 118 is located above the rear part of the straw discharging conveyor 12 in the rear upper cover 116. In a plan view, the upper part 118 overlaps with the rear part of the straw discharging conveyor 12. The upper part 118 is provided in the notch 117a so as to close the notch 117a. The upper part 118 is supported by the main body part 117 via a support shaft 119 extending in the left - right direction of the machine body on the rear part side of the upper part 118 so as to be vertically swingable. The upper part 118 is vertically swingable about the support shaft 119 extending in the left - right direction of the machine body on the rear part side of the upper part 118 between a closed position for closing the straw discharging space S and an open position for opening the straw discharging space S.

[0070] 〔Interlocking mechanism〕 An interlocking mechanism 120 is provided to swing the upper part 118 to the open position side in conjunction with the swing of the straw discharging frame 50 to the ascending position side. The interlocking mechanism 120 includes an arm 121 and a roller 122. The arm 121 extends from the straw discharging frame 50 (rear frame 68) to a lower position of the upper part 118. A roller 122 that can contact the contact part 126c from below is provided at the tip of the arm 121. The roller 122 is rotatable around a rotation axis extending in the front - rear direction of the machine body. The arm 121 is removably fixed to the arm stay 123 by bolts 124. The arm stay 123 is fixed (for example, welded) to the rear frame 68.

[0071] A main body part stay 125 is bolt - fixed to the inner surface of the main body part 117. An upper part stay 126 is fixed (for example, welded) to the inner surface of the upper part 118. A support shaft 119 is provided across the main body part stay 125 and the upper part stay 126. The upper part stay 126 includes a pair of left - right support parts 126a for supporting the support shaft 119, a mounting part 126b to which a spring 127 is attached, and a contact part 126c with which the roller 122 can contact. The contact part 126c is constituted by a plate - like part extending in the left - right direction of the machine body along the inner surface of the upper part 118.

[0072] A spring 127 is provided to bias the upper portion 118 to swing toward the closed position side. The spring 127 is provided across the upper portion 118 and the main body portion 117. The end of the spring 127 on the upper portion 118 side is attached to the attachment portion 126b. The main body portion 117 is provided with an attachment portion 128 to which the spring 127 is attached. The end of the spring 127 on the main body portion 117 side is attached to the attachment portion 128.

[0073] In a plan view, the upper portion 118 is formed in a shape slightly larger than the notch portion 117a. By the edge of the upper portion 118 abutting against the corresponding edge of the main body portion 117 from above at the notch portion 117a, the upper portion 118 is prevented from swinging downward from the closed position. That is, the edge of the upper portion 118 and the corresponding edge of the main body portion 117 at the notch portion 117a constitute a blocking portion 129 that blocks the upper portion 118 from swinging downward from the closed position.

[0074] 〔Lifting and lowering operations of the upper frame and the straw discharging frame〕 As shown in FIGS. 8 and 9, when an operator performs an upward operation by the lifting and lowering operation unit 112, the pair of front and rear hook plates 43 are swung to the disengagement side by the motor M. As a result, the engagement of the hook plate 43 (hook portion 43a) with the handling cylinder hook pin 44 is released. Then, in conjunction with the swinging of the rear hook plate 43 to the disengagement side, the outer hook 101 is swung to the disengagement side.

[0075] And in the connected state where the upper frame 40 and the straw discharging frame 50 are connected by the connecting mechanism 87, as shown in FIGS. 9 and 21, when the engagement of the outer hook 101 with respect to the outer hook pin 102 is released, the upper frame 40 and the straw discharging frame 50 are swung upward by the hydraulic cylinder 41. At this time, the handling cylinder 11, the belt transmission mechanism 53, and the tension clutch mechanism 57 are also swung upward by the hydraulic cylinder 41 together with the upper frame 40 and the straw discharging frame 50. Therefore, the positional relationship of the pulleys (the driving pulley 54 and the driven pulley 55) in the belt transmission mechanism 53 does not change.

[0076] And following the swinging of the straw discharging frame 50 to the ascending position side, the engagement of the inner hook 93 with respect to the inner hook pin 94 is released. Thus, the upper frame 40 and the straw discharging frame 50 ascend integrally to the same upper limit height.

[0077] Also, when the straw discharging frame 50 swings to the ascending position side, in conjunction with the swinging of the straw discharging frame 50 to the ascending position side, the arm 121 pushes up the upper portion 118 via the roller 122. Thus, in conjunction with the swinging of the straw discharging frame 50 to the ascending position side, the upper portion 118 swings to the open position side.

[0078] And when the operator performs a lowering operation by the lifting operation unit 112, the upper frame 40 and the straw discharging frame 50 are swung downward along with the contraction operation of the hydraulic cylinder 41. And following the swinging of the straw discharging frame 50 to the descending position side, the inner hook 93 engages with the inner hook pin 94.

[0079] And when the upper frame 40 and the straw discharging frame 50 are in the lowered position, the pair of front and rear hook plates 43 are swung to the engaging side by the motor M. Thereby, the hook plate 43 (hook portion 43a) engages with the handling cylinder hook pin 44. And in conjunction with the swinging of the rear hook plate 43 to the engaging side, the outer hook 101 is swung to the engaging side.

[0080] On the other hand, in a state where the connection between the upper frame 40 and the straw discharge frame 50 is released (connection release state), as shown in Fig. 22, when the engagement of the outer hook 101 with respect to the outer hook pin 102 is released, only the upper frame 40 among the upper frame 40 and the straw discharge frame 50 is swung upward by the hydraulic cylinder 41. At this time, the handling cylinder 11 and the tension clutch mechanism 57 are also swung upward by the hydraulic cylinder 41 together with the upper frame 40. Note that when only the upper frame 40 among the upper frame 40 and the straw discharge frame 50 is to be swung upward, it is necessary to remove the transmission belt 56 from the drive pulley 54 in advance. In this way, only the upper frame 40 among the upper frame 40 and the straw discharge frame 50 rises to the above-mentioned upper limit height.

[0081] Then, by swinging the straw discharge frame 50 upward by the gas damper 71, the straw discharge frame 50 rises to the above-mentioned upper limit height. Note that as described above, since the straw discharge conveying device 12 is detachable from the straw discharge frame 50, if the straw discharge conveying device 12 is removed from the straw discharge conveying device 12, only the straw discharge frame 50 can be swung upward.

[0082] Next, an embodiment that can be switched between a state where the upper frame 40 and the straw discharge frame 50 can rise integrally to the same upper limit height (hereinafter referred to as "first mode") and a state where the upper frame 40 and the straw discharge frame 50 can rise to different upper limit heights (hereinafter referred to as "second mode") will be described with reference to Figs. 25 to 31.

[0083] As shown in Fig. 25, in the first mode, the upper limit height of the upper frame 40 and the upper limit height of the straw discharge frame 50 are set to the same upper limit height H1. Also, the swing angle of the upper frame 40 and the swing angle of the straw discharge frame 50 are set to the same swing angle α.

[0084] In the second mode, the upper limit height of the upper frame 40 and the upper limit height of the straw discharging frame 50 are set to different upper limit heights. Specifically, the upper limit height of the upper frame 40 is set to the upper limit height H1, and the upper limit height of the straw discharging frame 50 is set to a position lower than the upper limit height H1 (upper limit height H2). That is, the upper limit height H1 of the upper frame 40 by the hydraulic cylinder 41 is set to a position higher than the upper limit height H2 of the straw discharging frame 50 by the gas damper 71.

[0085] Also, the swing angle of the upper frame 40 and the swing angle of the straw discharging frame 50 are set to different swing angles. Specifically, the swing angle of the upper frame 40 is set to the swing angle α, and the swing angle of the straw discharging frame 50 is set to an angle smaller than the swing angle α (swing angle β).

[0086] In the example shown in FIGS. 26 to 28, as the elevating mechanism of the upper frame 40 and the straw discharging frame 50, a hydraulic cylinder 41 that swings the upper frame 40 upward, a gas damper 71 that swings the straw discharging frame 50 upward, and a connecting mechanism 87 that connects the upper frame 40 and the straw discharging frame 50 in a releasable manner are provided. In the example shown in FIGS. 26 to 28, the connecting mechanism 87 functions as a switching mechanism for switching between the first mode and the second mode. FIG. 26 shows a state where the upper frame 40 and the straw discharging frame 50 are in the lowered position.

[0087] As shown in FIG. 27, in the first mode, the upper frame 40 and the straw discharging frame 50 are connected by the connecting mechanism 87 (connected state). In this connected state, the upper frame 40 and the straw discharging frame 50 are swung upward by the hydraulic cylinder 41 so that they rise integrally to the same upper limit height H1.

[0088] In this case, by previously releasing the connection between the gas damper 71 and the residue discharging frame 50, even if the residue discharging frame 50 rises beyond the maximum extended length of the gas damper 71 (corresponding to the upper limit height H2) to the upper limit height H1, the gas damper 71 will not be damaged.

[0089] As shown in FIG. 28, in the second mode, the connection between the upper frame 40 and the residue discharging frame 50 is released (connection released state). In this connection released state, the upper frame 40 is swung upward by the hydraulic cylinder 41 so that the upper frame 40 rises to the upper limit height H1.

[0090] Then, the residue discharging frame 50 can be swung upward by the gas damper 71 so that the residue discharging frame 50 rises to the upper limit height H2.

[0091] Also, as shown in FIGS. 29 to 31, the upper frame 40 is provided with a pressing portion 40a for pressing the residue discharging frame 50 from above, and the residue discharging frame 50 may be placed on the end portion of the gas damper 71 on the residue discharging frame 50 side so as to be separable upward from the gas damper 71. Even in the example shown in FIGS. 29 to 31, the connection mechanism 87 functions as a switching mechanism for switching between the first mode and the second mode. FIG. 29 shows a state where the upper frame 40 and the residue discharging frame 50 are located at the lowered positions.

[0092] As shown in FIG. 30, in the first mode, the upper frame 40 and the residue discharging frame 50 are connected by the connection mechanism 87 (connected state). In this connected state, the upper frame 40 and the residue discharging frame 50 are swung upward by the hydraulic cylinder 41 so that they rise integrally to the same upper limit height H1.

[0093] At this time, as described above, since the end of the gas damper 71 on the side of the straw discharge frame 50 is placed such that the straw discharge frame 50 can be separated upward from the gas damper 71, when the straw discharge frame 50 rises beyond the maximum extended length of the gas damper 71 (corresponding to the upper limit height H2), the straw discharge frame 50 separates upward from the gas damper 71. As a result, even if the straw discharge frame 50 rises to the upper limit height H1 beyond the maximum extended length of the gas damper 71 (corresponding to the upper limit height H2), the gas damper 71 will not be damaged.

[0094] As shown in FIG. 31, in the second mode, the connection between the upper frame 40 and the straw discharge frame 50 is released (connection released state). In this connection released state, the upper frame 40 is swung upward by the hydraulic cylinder 41 so that the upper frame 40 rises to the upper limit height H1.

[0095] And the straw discharge frame 50 can be swung upward by the gas damper 71 so that the straw discharge frame 50 rises to the upper limit height H2.

[0096] After that, when the upper frame 40 descends, the pressing portion 40a presses the straw discharge frame 50 from above, so that as the gas damper 71 automatically contracts, the straw discharge frame 50 descends together with the upper frame 40.

[0097] In addition, in the examples shown in FIGS. 26 to 28 and the examples shown in FIGS. 29 to 30, a locking mechanism (not shown) for holding the straw discharge frame 50 in position on the rear frame 37 may be provided. Thereby, in the second mode, even if the upper frame 40 rises, the locking mechanism can hold the straw discharge frame 50 in position on the rear frame 37 so that the straw discharge frame 50 does not rise.

[0098] Also, although not shown in the drawings, instead of the hydraulic cylinder 41, an electric actuator (not shown) may be employed as an actuator for vertically oscillating the upper frame 40, and instead of the gas damper 71, an electric actuator (not shown) may be employed as an actuator for vertically oscillating the straw discharging frame 50. The electric actuator may be either an electric motor or an electric cylinder. In this example, a control device (not shown) for controlling the electric actuator will be provided with a function of switching between a first mode and a second mode.

[0099] In this example, in the second mode, when the operator performs an upward operation by the lifting operation unit 112 and the upper frame 40 and the straw discharging frame 50 rise to the upper limit height H2, the upper frame 40 and the straw discharging frame 50 temporarily stop at the upper limit height H2. Then, again, when the operator performs an upward operation by the lifting operation unit 112, only the upper frame 40 rises to the upper limit height H1.

[0100] Also, in this example, the lifting operation unit 112 may be configured as follows. That is, in the first mode, a lifting operation unit (upward switch, downward switch) for lifting and lowering the upper frame 40 and the straw discharging frame 50, in the second mode, a lifting operation unit (upward switch, downward switch) for lifting and lowering the upper frame 40, and in the second mode, a lifting operation unit (upward switch, downward switch) for lifting and lowering the straw discharging frame 50 may be provided.

[0101] 〔Alternative Embodiment〕 (1) In the above embodiment, the outer locking mechanism 100 is employed. Instead of this, an outer locking mechanism 200 may be employed.

[0102] As shown in FIGS. 32 and 33, the outer lock mechanism 200 includes an outer hook 201, an outer hook arm 202, an outer hook spring 203, and an outer hook pin 102. The outer hook 201 is swingably supported on the rear surface portion of the rear stay 111 via a support shaft 204. An outer hook spring 203 is provided across the outer hook 201 and the rear surface portion of the rear stay 111 to urge the outer hook 201 to swing toward the engaging side. The outer hook arm 202 is fixed to the rear end portion of the link rod 109. An opening 201a is formed in the outer hook 201. A pin 202a protruding rearward is provided on the outer hook arm 202. The pin 202a is located within the opening 201a. According to such a configuration, when the outer hook arm 202 engages with the opening 201a via the pin 202a, the outer hook pin 102 swings toward the engaging side. At this time, the urging force of the outer hook spring 203 enables the engagement of the outer hook 201 with the outer hook pin 102 to be performed quickly.

[0103] (2) In the above embodiment, a stepped portion 66a is formed on the proximal frame 66. However, as shown in FIG. 34, a portion corresponding to the stepped portion 66a may not be formed on the proximal frame 66. In this case, since the vertical position of the inner hook 93 is higher than that in the above embodiment, the vertical position of the inner hook pin 94 may be made higher than that in the above embodiment.

[0104] (3) In the above embodiment, when the switching plate 29a is in the open state (state at the cutting position), after switching to the closed state (state at the non-cutting position), the straw discharging frame 50 may be raised. Also, when the straw discharging frame 50 is in the raised state, the switching plate 29a may be prevented from switching to the open state (state at the cutting position).

[0105] (4) In the above embodiment, the connecting mechanism 87 extends across the upper part of the left front-rear frame 36L and the upper part of the free end frame 69. However, alternatively, the connecting mechanism 87 may extend across the lower part of the left front-rear frame 36L and the lower part of the free end frame 69.

[0106] (5) In the above embodiment, the connecting mechanism 87 can be disconnected from each of the left front-rear frame 36L and the free end frame 69. However, alternatively, the connecting mechanism 87 may be disconnectable from either one of the left front-rear frame 36L and the free end frame 69.

[0107] (6) In the above embodiment, the connecting mechanism 87 connects the left front-rear frame 36L and the free end frame 69 in a disconnectable manner. However, alternatively, the connecting mechanism 87 may connect in a disconnectable manner a part of the upper frame 40 other than the left front-rear frame 36L and a part of the straw discharging frame 50 other than the free end frame 69.

[0108] (7) In the above embodiment, the handling cylinder 11 together with the upper frame 40 can be swung upward by the hydraulic cylinder 41. However, alternatively, only the upper frame 40 may be swingable upward by the hydraulic cylinder 41.

[0109] (8) In the above embodiment, the connecting mechanism 87 has a bolt-type (bolt 91) connection structure. However, alternatively, the connecting mechanism 87 may have a one-touch connection structure using a lever or the like.

Industrial Applicability

[0110] The present invention can be used not only for combines with a cabin but also for combines without a cabin.

Explanation of Signs

[0111] 9 Feed chain 10 Threshing device 1 2 Straw conveying device 5 0-row straw frame 53 Belt transmission mechanism 54 Driving pulley 55 Driven pulley 56 Transmission belt Y 2 swing axes

Claims

1. A feed chain that holds and conveys the harvested stalks; A threshing device that threshes the harvested stalks transported by the feed chain using a threshing drum; A straw conveying device that is connected to the rear side of the threshing device and receives the straw after the threshing process from the feed chain and conveys it to the rear. A straw discharge frame that supports the straw discharge conveying device and can swing up and down around a swing axis extending in the front-rear direction of the machine body between a lowered position where the straw discharge conveying device transports straw and an upper position where the straw discharge conveying device does not transport straw; A belt transmission mechanism for transmitting power to the input shaft of the straw discharge conveying device is provided. The belt transmission mechanism of the combine includes a drive pulley, a driven pulley, and a transmission belt wound around the drive pulley and the driven pulley.

2. The combine harvester according to claim 1 , wherein the drive pulley is disposed on the swing axis.

3. The combine harvester according to claim 1, wherein the belt transmission mechanism is configured to be able to swing up and down together with the straw discharge frame.

4. A combine harvester according to any one of claims 1 to 3, wherein the straw waste transport device is arranged to intersect with the swing axis in a plan view.

5. The straw discharge conveying device is configured such that a conveying start end portion located on the conveying start end side with respect to the swing axis and a conveying end end portion located on the conveying end end side together with the straw discharge frame can swing up and down around the swing axis, and when the conveying start end portion of the conveying start end portion rises, the conveying end portion of the conveying end end portion descends; The combine harvester according to claim 4, wherein the driven pulley is supported on the conveying start end portion.

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