combine

Abstract

To make an exhaust pipe capable of being easily cooled, while a space between a thresher and a grain tank is utilized as a space for installation of the exhaust pipe.SOLUTION: An exhaust pipe 46 comprises: a rising part 50 that is raised in a position higher than a thresher body 15A in a front part of the exhaust pipe 46; and a backward extended part 51 that is extended backward from the rising part 50 through a space between a thresher 15 and a grain tank in a height position corresponding to a position between an upper end T1 of the thresher body 15A and an upper end T2 of a top plate part 15B.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a combine harvester. [Background technology]

[0002] Some combine harvesters are equipped with a cutting section that is provided at the front of the traveling body and cuts crops in the field, a threshing device that threshes the crops cut by the cutting section and has a threshing main body and a top plate that covers the threshing main body from above, and a grain tank that is provided side by side with the threshing device and stores the grains obtained by the threshing device. Some combine harvesters of this type are equipped with an exhaust pipe that discharges engine exhaust, and the exhaust pipe extends backward through the space between the threshing device and the grain tank, as shown in Patent Document 1, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-128414 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned case where the space between the threshing device and the grain tank is utilized as the space for installing the exhaust pipe, if the heat dissipated from the exhaust pipe becomes trapped between the threshing device and the grain tank, it becomes difficult for the exhaust pipe to cool.

[0005] The present invention provides a combine harvester that can utilize the space between the threshing device and the grain tank as space for installing an exhaust pipe while making it easy to cool the exhaust pipe. [Means for solving the problem]

[0006] The combine according to the present invention comprises: a reaping unit provided at the front of the traveling body for reaping crops in the field; a threshing device for threshing the crops reaped by the reaping unit and having a threshing main body and a top plate portion for covering the threshing main body from above; and a grain tank provided side by side with the threshing device for storing grains obtained by the threshing device. A grain discharge device that discharges grains stored in the grain tank, the grain discharge device having a vertical conveying section provided behind the grain tank and extending in the vertical direction of the machine body, and a horizontal conveying section extending from an upper end of the vertical conveying section so as to be able to swing up and down; The machine is provided with an engine and an exhaust pipe for discharging exhaust gas from the engine, the exhaust pipe having a rising portion that is raised to a position higher than the threshing body at a front portion of the exhaust pipe, and a rearward extending portion that is extended rearward from the rising portion through a space between the threshing device and the grain tank at a height position corresponding to the height between the upper end of the threshing body and the upper end of the top plate portion, The exhaust port of the exhaust pipe is located rearward of the rear end of the vertical conveying section and rearward of the rear end of the threshing device. .

[0007] According to this configuration, the rearward extending portion of the exhaust pipe passes through a portion of the space between the threshing device and the grain tank where heat from the exhaust pipe is likely to escape upwards.Furthermore, the front portion of the exhaust pipe rises to a position higher than the threshing main body, making it possible to increase the length of the rearward extending portion, thereby making it possible to utilize the space between the threshing device and the grain tank as installation space for the exhaust pipe while making it easier to cool the exhaust pipe.

[0008] In the present invention, The threshing device has a threshing section, a sorting section that performs a sorting process to separate the threshed material obtained by the threshing section into grains and dust, and a second reduction device that is provided in the space between the threshing device and the grain tank and returns the second processed material obtained by the sorting section to the sorting section, and it is preferable that the raised portion is raised forward of the second reduction device and overlaps with the second reduction device when viewed in the fore-and-aft direction of the machine body.

[0009] According to this configuration, since the second processed material is returned to the sorting section, the front raised portion of the exhaust pipe is located forward of the second reduction device, whose conveying end is located at a position corresponding to the front of the threshing device. Therefore, the length of the rearward extending portion that passes through the area where heat can easily escape can be increased, making it easier to cool the exhaust pipe.

[0010] In the present invention, It is preferable that an upper end of the rising portion is provided with a bent portion that is bent rearward and connected to the rearward extending portion.

[0011] According to this configuration, the bent portion allows the exhaust gas from the rising portion to flow smoothly to the rearward extending portion, so that the exhaust gas does not stagnate within the exhaust pipe, preventing the temperature of the exhaust pipe from rising and allowing the exhaust pipe to cool more easily.

[0012] In the present invention, It is preferable that the rearward extending portion be provided with a rearward upward inclined portion extending from the bent portion in a rearward upward inclined position, and a horizontal portion extending rearward from the rearward upward inclined portion in a horizontal position.

[0013] According to this configuration, the exhaust gas from the bent portion of the rising section flows smoothly into the rearward extending portion due to the rearward upward inclined portion, so that the exhaust gas does not stagnate within the exhaust pipe, the temperature rise of the exhaust pipe is suppressed, and the exhaust pipe can be cooled easily.

[0014] In the present invention, It is preferable that an ejector portion that introduces outside air from the exhaust pipe into the inside of the exhaust pipe is formed in the rear upwardly inclined portion.

[0015] According to this configuration, outside air is introduced into the exhaust pipe by the ejector section in the rear upwardly inclined section where the exhaust flows smoothly, so that air is smoothly introduced from the outside to the inside of the exhaust pipe, thereby efficiently cooling the exhaust and making it easier to cool the exhaust pipe.

[0016] In the present invention, The rear end of the exhaust pipe is bent upward, and the rear end is located higher than the top plate portion. In the above state It is preferable that the exhaust port is open.

[0017] According to this configuration, the exhaust gas discharged from the exhaust pipe is discharged at a high position, making it difficult for the exhaust gas discharged from the exhaust pipe to flow down into the farm field.

[0018] In the present invention, It is preferable that the side wall of the grain tank facing the threshing device is provided with a bulging portion that bulges toward the threshing device, and the rearward extension portion passes above the bulging portion.

[0019] According to this configuration, heat dissipated from the rearward extending portion can easily escape upward, so the capacity of the grain tank can be increased by the bulging portion while preventing the temperature of the bulging portion from increasing due to heat dissipation from the exhaust pipe. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a left side view showing the entire combine harvester. [Diagram 2] FIG. 2 is a right side view showing the entire combine harvester. [Diagram 3] FIG. 2 is a plan view showing the entire combine harvester. [Figure 4] FIG. [Diagram 5] FIG. 4 is a right side view showing the exhaust pipe and the cover. [Figure 6] FIG. 4 is a right side view showing the support structure for the exhaust pipe. [Figure 7] FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 5. [Figure 8] FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 5. [Figure 9] FIG. 4 is a plan view showing the exhaust pipe and the cover. [Figure 10] FIG. 4 is a left side view showing the support structure of the front cover, the middle cover, and the rear cover. [Figure 11] 13 is a right side view showing the support structure of the middle cover and the rear cover. FIG. [Figure 12] FIG. 2 is a perspective view showing the first support member, the second support member, the third support member, the first stay, the second stay, the third stay, the front cover, the middle cover, and the rear cover in a removed state. [Figure 13] 2 is a perspective view showing a first support member, a second support member, a third support member, and a front cover, a middle cover, and a rear cover in a removed state. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following explanation, with regard to the running body of the combine, the direction of arrow F shown in Figures 1, 2 and 3 is referred to as the "forward direction of the body," the direction of arrow B is referred to as the "rearward direction of the body," the direction of arrow U shown in Figures 1, 2 and 4 is referred to as the "upward direction of the body," the direction of arrow D is referred to as the "downward direction of the body," the direction of arrow L shown in Figures 3 and 4 is referred to as the "leftward direction of the body," and the direction of arrow R is referred to as the "rightward direction of the body."

[0022] [Overall configuration of the combine] As shown in Figs. 1, 2, 3, and 4, the combine harvester includes a traveling body 2 supported by a pair of left and right crawler traveling devices 1. The traveling body 2 includes a machine frame 3 formed by connecting a plurality of steel materials such as square pipe materials. The crawler traveling device 1 is provided at the bottom of the machine frame 3. A driving section 4, a driving unit 5, and a reaping and conveying section 6 are provided at the front of the traveling body 2. The driving unit 4 and the driving unit 5 are provided at a location on one lateral end side at the front of the traveling body 2, and the reaping and conveying section 6 is provided at a location on the opposite side to the driving unit side at the front of the traveling body 2. The driving unit 4 includes a driver's seat 7 and a sunshade 8 that covers the upper part of the boarding space. The driving unit 5 includes an engine 9. The reaping and conveying section 6 includes a reaping section 6A provided at the front of the reaping and conveying section 6, and a feeder 10 extended backward from the rear of the reaping section 6A. In the reaping section 6A, the tips of crops such as rice and wheat in the field are raked backward by a rotating reel 11, the bases of the raked crops are cut by a clipper-type reaping device 12 to harvest the crops, and the reaped crops are conveyed laterally to a supply point for the feeder 10 by a lateral feed auger 13. The feeder 10 receives the crops from the lateral feed auger 13 and conveys the received crops rearward and upward. The feeder 10 is equipped with a dust discharge device 10A that sucks in and discharges dust such as straw mixed in the crops being conveyed by the blowing action of a rotating fan. The reaping and conveying section 6 is swung up and down between a lowered working state and an elevated non-working state by the extension and contraction of a lifting cylinder 14 connected to the bottom of the feeder 10. A threshing device 15 and a grain tank 16 are supported side by side at the rear of the machine frame 3. The threshing device 15 is disposed behind the feeder 10. The grain tank 16 is disposed behind the driving section 4. A threshing cover 17 is provided laterally outward of the threshing device 15. The threshing cover 17 is configured to be divisible into a number of separate covers. A tank cover 18 is provided laterally outward of the lower part of the grain tank 16. The threshing device 15 receives the crop from the feeder 10, threshes it, and separates the grains obtained by the threshing process from dust such as broken straw. The threshing device 15 is configured as a whole-culm input type so that the entire harvested culm from the base to the tip is input into the threshing chamber.The grain tank 16 collects and stores the grains that have been sorted by the threshing device 15. A grain discharge device 19 that discharges the grains stored in the grain tank 16 is connected to the rear of the grain tank 16. The grain tank 16 is supported so that its position can be changed between an open position for maintenance that protrudes laterally outward from the traveling body 2, and a closed position for work that is positioned in the front-to-rear direction behind the driving unit 4, with the axis of a vertical conveying section 19A provided on the grain discharge device 19 as a swing fulcrum.

[0023] 2 and 4, the grain tank 16 has a narrowed portion at its lower part, the width of which narrows toward the bottom. A tool box 26 is provided in the space between the narrowed portion at the outer side of the machine body and the tank cover 18. The tool box 26 is supported by the right inclined wall of the grain tank 16.

[0024] [Configuration of grain discharge device] As shown in Figs. 2 and 3, the grain discharge device 19 has a vertical conveying section 19A provided behind the grain tank 16 in a state of extending in the vertical direction of the machine body, and a horizontal conveying section 19B extended from the upper end of the vertical conveying section 19A so as to be able to swing up and down. The lower part of the vertical conveying section 19A is connected to the rear lower part of the grain tank 16 via a connection case 20. The vertical conveying section 19A receives grains discharged from the grain tank 16 to the connection case 20, and lifts the received grains. The grains are discharged from the grain tank 16 by a bottom screw (not shown) provided in the bottom of the grain tank 16. The horizontal conveying section 19B receives the grains lifted by the vertical conveying section 19A, transports the received grains horizontally, and discharges them from a discharge tube 22 provided at the extended end of the horizontal conveying section 19B.

[0025] As shown in Figs. 1, 2 and 4, a swivel drive mechanism 23 is connected to a midpoint of the vertical conveying section 19A. The swivel drive mechanism 23 is covered by a cover 24. The horizontal conveying section 19B is swiveled around the axis of the vertical conveying section 19A as the vertical conveying section 19A is rotated relative to the connection case 20 by the swivel drive mechanism 23. As shown in Figs. 2 and 3, a hoisting cylinder 25 is connected to the base of the horizontal conveying section 19B. The horizontal conveying section 19B is swung up and down relative to the vertical conveying section 19A as the hoisting cylinder 25 expands and contracts.

[0026] [Configuration of threshing device] As shown in Figures 4 and 5, the threshing device 15 has a threshing body 15A and a top plate portion 15B that covers the threshing body 15A from above. The threshing body 15A has a threshing frame composed of left and right side walls 30 and the like. The threshing body 15A is configured so that the upper end of the side walls 30 is the upper end T1 of the threshing body 15A. As shown in Figures 3, 4, and 7, the top plate portion 15B has an arc-shaped top plate body 36 when viewed in the front-rear direction, a front wall plate 37 connected to the front end of the top plate body 36, and a rear wall plate 38 connected to the rear end of the top plate body 36.

[0027] The threshing device 15 comprises a threshing section 31 formed across the threshing main body 15A and the top plate section 15B, and a sorting section 35 formed below the threshing section 31.

[0028] 7, the threshing section 31 includes a threshing chamber 32, a threshing drum 33 rotatably disposed in the threshing chamber 32, and a receiving net 34 disposed below the threshing drum 33. The threshing chamber 32 is formed by the left and right side walls 30, the top plate portion 15B, the receiving net 34, etc. The threshing chamber 32 and the threshing drum 33 are not included in the threshing main body 15A.

[0029] The sorting section 35 is equipped with a oscillating sorting device (not shown) that is rotatably mounted below the receiving net 34 and receives and sieves out processed material that has leaked through the receiving net 34, a winnower (not shown) that is mounted in front of and below the oscillating sorting device and supplies sorting air to the oscillating sorting device, a first screw 39 (see Figure 5) that is mounted below the oscillating sorting device and transports the first processed material obtained by the sorting process to the outer side of the grain tank side of the threshing device 15, and a second screw 40 (see Figure 5) that is mounted behind the first screw 39 and transports the second processed material obtained by the sorting process to the outer side of the grain tank side of the threshing device 15.

[0030] 4 and 5, the No. 2 reducing device 42 connected to the No. 2 screw 40 is provided between the threshing device 15 and the grain tank 16. The No. 2 reducing device 42 extends from the terminal end of the No. 2 screw 40 in a front-upward tilted position, and the conveying terminal end of the No. 2 reducing device 42 opens toward the oscillating sorting device at the front of the threshing device 15. The No. 2 processed material discharged from the No. 2 screw 40 is reduced by the No. 2 reducing device 42 to the front of the oscillating sorting device in the sorting section 35, and is reprocessed by the oscillating sorting device to be separated into single grains.

[0031] [Exhaust pipe configuration] 2 and 5, the engine 9 is provided in front of the grain tank 16. An exhaust muffler 45 connected to an exhaust section 9a of the engine 9 is provided on the left lateral side of the engine 9, and an exhaust pipe 46 is connected to a discharge tube 45a provided at the rear of the exhaust muffler 45. Exhaust gas discharged from the engine 9 is introduced into the exhaust muffler 45 and silenced, and the silenced exhaust gas is discharged into the exhaust pipe 46 and discharged to the outside of the traveling body 2 by the exhaust pipe 46.

[0032] 5, 6, and 9, the exhaust pipe 46 extends in the front-rear direction through the space between the threshing device 15 and the grain tank 16. In this embodiment, the exhaust pipe 46 extends in the front-rear direction through a position lower than the top plate portion 15B in the space between the threshing device 15 and the grain tank 16. Specifically, the exhaust pipe 46 extends in the front-rear direction through a height position corresponding to between the upper end T1 of the threshing body 15A and the upper end T2 of the top plate portion 15B in the space between the threshing device 15 and the grain tank 16.

[0033] More specifically, the exhaust pipe 46 is divided into three parts, a first divided exhaust pipe 47, a second divided exhaust pipe 48 and a third divided exhaust pipe 49, in the longitudinal direction, as shown in FIGS.

[0034] As shown in FIGS. 5 and 6, the exhaust pipe 46 includes an upright portion 50 that rises from the discharge tube 45a at the front portion of the exhaust pipe 46, and a rearward extending portion 51 that extends rearward from the upright portion 50.

[0035] The rising portion 50 is raised to the upper part of the threshing device 15, as shown in Figs. 5 and 6. In this embodiment, the rising portion 50 is raised to a position higher than the threshing body 15A of the threshing device 15. Specifically, the threshing body 15A is configured so that the upper end of the side wall 30 becomes the upper end T1 of the threshing body 15A. The rising portion 50 is raised to a position higher than the upper end T1. As shown in Figs. 5, 6, and 8, the rising portion 50 is raised forward of the second reduction device 42 and overlaps with the second reduction device 42 when viewed in the fore-and-aft direction of the machine body.

[0036] As shown in Figures 5, 6, 7, and 8, the rearward extension portion 51 passes rearward through the space between the threshing device 15 and the grain tank 16 at a height position corresponding to between the upper end T1 of the threshing main body 15A and the upper end T2 of the top plate portion 15B.

[0037] 7 and 9, a bulging portion 52 that bulges toward the threshing device is provided on the side wall 16a of the grain tank 16 on the threshing device side, thereby increasing the capacity of the grain tank 16. The rearward extending portion 51 passes above the bulging portion 52.

[0038] 5 and 6, the upper end of the rising portion 50 is provided with a bent portion 50a bent backward, and the rising portion 50 is connected to the rearward extending portion 51 by the bent portion 50a. The rearward extending portion 51 is provided with a rearward upward inclined portion 51k extending backward from the bent portion 50a of the rising portion 50 in a rearward upward inclined position, and a horizontal portion 51s extending backward from the rearward upward inclined portion 51k in a horizontal position.

[0039] 5 and 6, a first ejector section 53 that introduces outside air from the exhaust pipe 46 into the inside of the exhaust pipe 46 is provided at the lower part of the rising section 50. Specifically, as shown in Fig. 6, the first ejector section 53 is provided at the lower part of the rising section 50 with a connection section 54 that fits around and connects to the discharge tube 45a of the exhaust muffler 45, and is configured such that a gap is provided between the connection section 54 and the discharge tube 45a to allow air to flow from the outside of the exhaust pipe 46 to the inside.

[0040] 5 and 6, a second ejector portion 55 that introduces outside air from the exhaust pipe 46 into the inside of the exhaust pipe 46 is provided in a portion of the exhaust pipe 46 that is located rearward of the front cover 71 that covers the rising portion 50. The second ejector portion 55 is provided in a rearward upward inclined portion 51k in the rearward extending portion 51, as shown in FIG. 6. Specifically, the rearward upward inclined portion 51k is formed across the first divided exhaust pipe 47 and the second divided exhaust pipe 48. The second ejector section 55 is provided with a connection section 56 that is fitted over and connected to the upstream end of the second split exhaust pipe 48 and the end of the first split exhaust pipe 47 opposite the exhaust muffler side, and is configured such that a gap is provided between the connection section 56 and the end of the first split exhaust pipe 47 to allow air to flow from the outside to the inside of the exhaust pipe 46.

[0041] 5 and 6, the rear end 57 of the exhaust pipe 46 is bent upward, and an exhaust port 58 is opened at the rear end 57, which is located higher than the top plate portion 15B. Specifically, the rear end 57 is configured so that the upper part of the exhaust port 58 is located higher than the upper end T2 of the top plate portion 15B. The exhaust port 58 opens upward toward the rear. The exhaust port 58 is located rearward of the rear end of the threshing device 15 and the rear end of the grain tank 16.

[0042] [Exhaust pipe support] As shown in Figures 5 and 6, the exhaust pipe 46 is configured to be supported on the threshing device 15 via a first stay 61 that supports one point of the rising portion 50, a second stay 62 that supports two points, front and rear, of the rear upward inclined portion 51k, and a third stay 63 that supports three points, front and rear, of the horizontal portion 51s.

[0043] Specifically, the first stay 61 is configured to be connected to the rear of the rising portion 50 as shown in Fig. 6. The first stay 61 is configured to be directly connected to the right side wall 30 of the threshing device 15. The first stay 61 is connected to the exhaust pipe 46 by welding. The first stay 61 is connected to the side wall 30 by a connecting bolt.

[0044] 5 and 6, the two second stays 62 and the three third stays 63 are configured to be connected to the lower part of the exhaust pipe 46 so as to receive and support the exhaust pipe 46 from below. Each of the second stays 62 and each of the third stays 63 are connected to the exhaust pipe 46 by welding.

[0045] The front second stay 62 of the two second stays 62 is configured to be directly connected to the right side wall 30 of the threshing device 15, as shown in Figs. 5 and 6. The rear second stay 62 of the two second stays 62 and the frontmost third stay 63 of the three third stays 63 are configured to be connected to the front first support member 64 of the first support members 64 erected at two positions, front and rear, on the upper portion 30a of the right side wall 30 of the threshing device 15, and to be connected to the right side wall 30 via the first support member 64. The second and third third stays 63 from the front of the three third stays 63 are configured to be connected to the rear first support member 64 of the first support members 64 at two positions, front and rear, and to be supported by the right side wall 30 via the first support member 64. The front second stay 62 is connected to the side wall 30 by a connecting bolt. The second stay 62 and the three third stays 63 are connected to the first support member 64 by connecting bolts to a side portion 64a of the first support member 64 on the exhaust pipe side.

[0046] [Configuration of the exhaust pipe cover] As shown in FIGS. 5 and 9, a cover 70 is provided to cover the exhaust pipe 46, and the cover 70 is configured to prevent dust such as straw chips from falling onto the exhaust pipe 46.

[0047] More specifically, as shown in Figures 5, 9, and 10, the cover 70 is provided with a front cover 71 that covers the rising portion 50 of the exhaust pipe 46, a middle cover 72 that covers the front portion of the rearward extending portion 51 of the exhaust pipe 46, and a rear cover 73 that is rearward of the middle cover 72 and covers the rearward extending portion 51.

[0048] As shown in Figures 5, 9, 10, 12, and 13, the front cover 71 includes a front cover part 71a that covers the rising portion 50 from the front, a left side cover part 71b that covers the rising portion 50 from the left side, and a right side cover part 71c that covers the rising portion 50 from the right side. As shown in Figures 5 and 10, the lower part of the front cover part 71a is in a vertical position, and the upper part of the front cover part 71a is in an inclined position that is positioned further rearward as it goes upward. The vertical length of the right side cover part 71c is longer than the vertical length of the left side cover part 71b.

[0049] The front cover 71 is configured to be supported by the threshing device 15. Specifically, as shown in Figs. 12 and 13, the front cover 71 has a first mounting portion 71d formed on the upper portion of the front cover portion 71a and a second mounting portion 71e formed on the lower left portion of the front cover portion 71a. As shown in Figs. 12 and 13, a second support member 74 is erected from the upper portion 30a of the right side wall 30 of the threshing device 15, in front of the first support members 64 at two locations, front and rear. As shown in Figs. 9 and 10, the first mounting portion 71d is configured to be placed on a front receiving portion 74a formed on the upper portion of the second support member 74 and connected by a connecting bolt, and is supported by the threshing device 15 via the second support member 74. The second mounting portion 71e is configured to be directly connected to the right side wall 30 of the threshing device 15 by a connecting bolt. The front cover 71 is supported by the threshing device 15.

[0050] As shown in Figures 5, 12, and 13, the middle cover 72 and the rear cover 73 include an upper cover portion 75 that covers the rearward extending portion 51 of the exhaust pipe 46 from above, a left side cover portion 76 that is connected to the end of the upper cover portion 75 on the threshing device side and covers the side of the rearward extending portion 51 of the exhaust pipe 46 on the threshing device side, and a right side cover portion 77 that is connected to the end of the upper cover portion 75 opposite the threshing device side and covers the side of the rearward extending portion 51 of the exhaust pipe 46 on the grain tank side.

[0051] The left side cover portion 76 of the middle cover 72 and the left side cover portion 76 of the rear cover 73 are configured to be inclined downward toward the threshing device side, as shown in Figures 7 and 9.

[0052] The front-rear length of the right side cover portion 77 of the middle cover 72 is shorter than the front-rear length of the upper cover portion 75 of the middle cover 72. The right side cover portion 77 of the middle cover 72 extends downward from the front portion of the upper cover portion 75. As shown in Figs. 5, 9 and 10, the middle cover 72 is configured so that the upper cover portion 75 covers the second ejector portion 55 from above, and the left side cover portion 76 and the right side cover portion 77 cover the second ejector portion 55 from both lateral sides. The middle cover 72 is configured to be located at a position lower than the upper end T2 of the top plate portion 15B.

[0053] The front-rear length of the right side cover part 77 of the rear cover 73 is shorter than the front-rear length of the upper cover part 75 of the rear cover 73. The right side cover part 77 of the rear cover 73 extends downward from the rear part of the upper cover part 75. As shown in Figs. 5, 9, and 10, the rear cover 73 is configured to cover the rear end part 57 of the exhaust pipe 46 from above with the upper cover part 75, and to cover the rear end part 57 of the exhaust pipe 46 from both lateral sides with the left side cover part 76 and the right side cover part 77. Specifically, as shown in Fig. 5, the rear end part 75a of the upper cover part 75 of the rear cover 73 is bent upward along the rear end part 57 of the exhaust pipe 46. The rear cover 73 is configured to be located at a position lower than the upper end T2 of the top plate part 15B in a portion located forward of the portion covering the rear end part 57 of the exhaust pipe 46.

[0054] The upper cover portion 75, the left side cover portion 76, and the right side cover portion 77 of the middle cover 72 and the rear cover 73 are each configured to be supported by the threshing device 15. The upper cover portion 75, the left side cover portion 76, and the right side cover portion 77 of the middle cover 72, and the second stay 62 and the third stay 63 supporting the portion of the exhaust pipe 46 covered by the middle cover 72 are each configured to be supported by the threshing device 15. The upper cover portion 75, the left side cover portion 76, and the right side cover portion 77 of the rear cover 73, and the third stay 63 supporting the portion of the exhaust pipe 46 covered by the rear cover 73 are each configured to be supported by the threshing device 15.

[0055] Specifically, as shown in Figures 12 and 13, the middle cover 72 has a first mounting portion 78 formed in the front portion of the upper cover portion 75, a second mounting portion 79 formed in the rear portion of the upper cover portion 75, a third mounting portion 80 formed between the first mounting portion 78 and the second mounting portion 79, a fourth mounting portion 81 formed in the front lower portion of the left side cover portion 76, a fifth mounting portion 82 formed in the rear lower portion of the left side cover portion 76, and a sixth mounting portion 83 formed between the fourth mounting portion 81 and the fifth mounting portion 82.

[0056] As shown in Figures 12 and 13, the rear cover 73 has a first mounting portion 85 formed on the front of the upper cover portion 75, a second mounting portion 86 formed on the upper cover portion 75 rearward of the first mounting portion 85, a third mounting portion 87 formed on the lower front of the left side cover portion 76, a fourth mounting portion 88 formed on the left side cover portion 76 rearward of the third mounting portion 87, and a fifth mounting portion 89 formed on the lower portion of the left side cover portion 76 rearward of the fourth mounting portion 88.

[0057] As shown in Figures 12 and 13, third support members 90 are erected from two front and rear locations on the upper portion 30a of the right side wall 30 of the threshing device 15, rearward of the second support member 74. The front third support member 90 of the two front and rear third support members 90 is located laterally of the front first support member 64 of the two front and rear first support members 64. The rear third support member 90 of the two front and rear third support members 90 is located laterally of the rear first support member 64 of the two front and rear first support members 64.

[0058] As shown in Figures 5, 8, 9, 10 and 11, in the middle cover 72, the first mounting portion 78 is configured to be placed on the rear receiving portion 74b formed on the upper part of the second support member 74 and connected by a connecting bolt, the second mounting portion 79 is configured to be stacked on the first mounting portion 85 in the rear cover 73 and connected by a connecting bolt, the third mounting portion 80 is configured to be stacked on the upper part of the front third support member 90 of the front and rear third support members 90 and connected by a connecting bolt, the fourth mounting portion 81 is configured to be placed on the upper part 30a of the right side wall 30 forward of the front first support member 64 and connected by a connecting bolt, the fifth mounting portion 82 is configured to be connected to the upper part 30a of the right side wall 30 between the front and rear first support members 64 by a connecting bolt, and the sixth mounting portion 83 is configured to be connected to the side part 64b of the front first support member 64 on the threshing device side by a connecting bolt.

[0059] As shown in Figures 5, 8, 9, 10 and 11, in the rear cover 73, the second mounting portion 86 is configured to be overlapped from above on the upper part of the rear third support member 90 of the front and rear third support members 90 and connected by a connecting bolt, the third mounting portion 87 is configured to be overlapped from above on the upper part 30a of the right side wall 30 between the front and rear first support members 64 and connected by a connecting bolt, the fourth mounting portion 88 is configured to be connected by a connecting bolt to the side portion 64b of the rear first support member 64 on the threshing device side of the front and rear first support members 64, and the fifth mounting portion 89 is configured to be connected by a connecting bolt to the upper part 30a of the right side wall 30 rearward of the rear first support member 64.

[0060] [Another embodiment] (1) In the above embodiment, the exhaust pipe 46 is configured by three divided exhaust pipes 47, 48, 49, but is not limited to this. For example, the exhaust pipe may be configured by a single undivided exhaust pipe, or by two or four or more divided exhaust pipes.

[0061] (2) In the above embodiment, the cover for the rearward extending portion 51 is configured to be separable into a middle cover 72 and a rear cover 73, the top cover for the rearward extending portion 51 is provided in a divided state into an upper cover portion 75 of the middle cover 72 and an upper cover portion 75 of the rear cover 73, and the side cover for the rearward extending portion 51 is provided in a divided state into a left side cover portion 76 of the middle cover 72 and a left side cover portion 76 of the rear cover 73. However, this is not limited to the above, and the middle cover 72 and the rear cover 73 may be configured as a single cover, and the top cover and side cover may be configured as a single top cover and side cover that are not divided front and rear.

[0062] (3) In the above embodiment, an example was shown in which the rising portion 50 and the second reduction device 42 overlap when viewed in the fore-and-aft direction of the aircraft, but this is not limited thereto and they may not overlap.

[0063] (4) In the above embodiment, the second ejector portion 55 is provided, but the second ejector portion 55 may not be provided.

[0064] (5) In the above embodiment, the exhaust port 58 is provided at the rear end 57 of the exhaust pipe 46 that is bent upward, but this is not limited to the above. For example, the rear end 57 of the exhaust pipe 46 may be configured to be positioned in a horizontal position, and the exhaust port may open rearward at the rear end that is in the horizontal position.

[0065] (6) In the above embodiment, an example was shown in which the bulging portion 52 was provided, but the bulging portion 52 may not be provided. [Industrial Applicability]

[0066] The present invention can be applied to a combine harvester that has a reaping unit provided at the front of a traveling body, a threshing device and a grain tank provided side by side, and an engine. [Explanation of symbols]

[0067] 2 Running body 6A Reaping part 9 Engine 15 Threshing equipment 15A Threshing unit 15B Top plate 16 Grain Tank 19 grain ejector 19A Vertical conveyor 19B Horizontal conveyor 31 Threshing Department 35 Sorting Department 42 No. 2 reduction device 46 Exhaust pipe 50 Rising section 50a Bend 51 Rearward extension 51k Rear rising slope 51s horizontal section 52 Bulge 55 Ejector section (second ejector section) 57 Rear end 58 Exhaust port 75 Top cover (top cover part) 76 Side cover (left side cover part) T1 Top end of threshing body T2 Top edge of the top plate

Claims

1. A reaping unit provided at the front of the traveling body for reaping crops in the field; A threshing device that threshes the crops harvested by the harvesting unit and has a threshing body and a top plate that covers the threshing body from above; A grain tank arranged side by side with the threshing device and storing the grains obtained by the threshing device; A grain discharge device that discharges grains stored in the grain tank, the grain discharge device having a vertical conveying section provided behind the grain tank and extending in the vertical direction of the machine body, and a horizontal conveying section extending from an upper end of the vertical conveying section so as to be able to swing up and down; The engine, an exhaust pipe for discharging exhaust gas from the engine; The exhaust pipe includes a rising portion that is raised to a position higher than the threshing body at the front of the exhaust pipe, and a rearward extending portion that is extended rearward from the rising portion through a space between the threshing device and the grain tank at a height position corresponding to the height between the upper end of the threshing body and the upper end of the top plate portion, A combine harvester, wherein the exhaust outlet of the exhaust pipe is located rearward of the rear end of the vertical conveying section and rearward of the rear end of the threshing device.

2. The threshing device has a threshing section, a sorting section that performs a sorting process to sort the threshed product obtained by the threshing section into grains and dust, and a second return device that is provided in a space between the threshing device and the grain tank and returns the second processed product obtained by the sorting section to the sorting section. The combine harvester according to claim 1 , wherein the raised portion is raised forward of the second reduction device and overlaps with the second reduction device when viewed in the fore-and-aft direction of the machine body.

3. 3. The combine harvester according to claim 1, wherein an upper end of the rising portion is provided with a bent portion that is bent rearward and connected to the rearward extending portion.

4. The combine harvester according to claim 3 , wherein the rearward extending portion is provided with a rearward upward inclined portion extending from the bent portion in a rearward upward inclined position, and a horizontal portion extending rearward from the rearward upward inclined portion in a horizontal position.

5. The combine harvester according to claim 4, wherein an ejector portion is formed in the rear upwardly inclined portion to introduce outside air from the exhaust pipe into the inside of the exhaust pipe.

6. 6. A combine harvester according to claim 1, wherein a rear end of the exhaust pipe is bent upward, and the exhaust port is opened at the rear end in a state where it is positioned higher than the top plate portion.

7. A bulging portion bulging toward the threshing device is provided on a side wall of the grain tank on the threshing device side, The combine harvester according to any one of claims 1 to 6, wherein the rearward extending portion passes above the bulging portion.

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