TWM557502U - Combine - Google Patents

Abstract

The present utility model provides a combine capable of confirming the storage capacity of the grain tank to increase the operation efficiency of the harvest yield and promote the durability of tubing disposed from the urea solution tank towards a side of the SCR catalyst. The combine includes an exhaust gas purification device (20) configured to purify waste gas generated by the engine (E), and the winnow part (8A) of the grain discharging device (8) disposed at a side of the grain tank (7); in which the exhaust gas purification device (20) reduces and purifies the oxynitrides contained in waste gas generated by the engine (E) to be the SCR catalyst through the ammonium produced from the urea solution tank, and the urea solution tank (25) configured to store urea solution is disposed in the space between the side wall of the grain tank (7) and the winnow part (8A). In addition, the urea solution tank (25) is disposed at the upper side of the connection part (18) connecting to the bottom of the grain tank (7) and the lower part of the winnow part (8A).

Description

Combine harvester

This creation relates to a combine harvester with an exhaust gas purification device.

In a conventional combine harvester, there is known a technique including an oxidation catalyst for oxidizing unburned gas in an exhaust gas burned by an engine, and nitrogen oxides in exhaust gas after passing through the oxidation catalyst. A SCR (Selective Catalytic Reduction) catalyst purified from ammonia produced by urea water forms a concave portion in the rear wall of the grain tank in which the grain is stored, and a urea water tank is accommodated in the concave portion ( Patent Document 1).

Further, a technique of arranging a urea water tank in a space formed between the threshing apparatus and the grain tank is also known (Patent Document 2).

[Previous Technical Literature]

[Patent Literature]

Patent Document 1: Japanese Laid-Open Patent Publication No. 2017-104083.

Patent Document 2: Japanese Laid-Open Patent Publication No. 2017-112992.

However, in the technique disclosed in Patent Document 1, in order to be in a grain box The rear wall forms a concave portion, and the storage capacity of the grain tank is reduced, and the grain discharge operation has to be frequently performed, and there is a problem that the efficiency of the harvesting operation is lowered.

Further, when the grain tank is rotated between the working position on the machine body and the maintenance position on the outside of the machine body centering on the vertical axis disposed on the rear side, the urea water tank and the grain tank are integrally rotated. Therefore, the position of the hose that has been wired from the urea water tank to the SCR catalyst side is changed, and there is a disadvantage that the damage or deterioration of the hose becomes easy.

Further, in the technique of Patent Document 2, in the case where the grain tank is rotated from the working position on the machine body to the maintenance position on the outside of the machine body, in order to prevent the rear portion of the left wall of the grain tank and the urea water The interference of the water tank needs to reduce the width of the grain tank in the left-right direction, and there is a problem that the storage capacity of the grain tank is reduced.

Therefore, the main problem of the present invention is to provide a combine harvester capable of ensuring the storage capacity of the grain tank, improving the efficiency of the harvesting operation, and improving the wiring from the urea water tank to the SCR catalyst side. The durability of the hose.

In order to solve the above problems, the author uses the following scheme.

The creation described in the first aspect is a combine harvester equipped with an exhaust gas purifying device (20) for purifying exhaust gas of the engine (E), and the valley portion (8A) of the grain discharge device (8) is provided in the grain. On the side of the tank (7), the exhaust gas purifying device (20) is provided with an SCR touch that purifies nitrogen oxides in the exhaust gas discharged from the engine (E) by reducing ammonia generated from the urea water. Medium (22), and the urea water tank (25) storing urea water is disposed in A space between the side wall of the grain tank (7) and the aforementioned valley portion (8A).

According to the second aspect of the invention, in the combine harvester according to the first aspect, the urea water tank (25) is disposed in communication with the bottom of the grain tank (7) and the lower portion of the valley portion (8A). The upper side of the part (18).

According to the third aspect of the invention, in the combine harvester according to the second aspect, the urea water tank (25) is supported by the support members (41, 42) provided on the side of the communication portion (18).

According to a fourth aspect of the invention, in the combine of the third aspect, the support member (41, 42) is disposed on the first support member (41) disposed on one side of the communication portion (18) and disposed in the foregoing A second support member (42) on the other side of the communication portion (18) is formed.

In the combine harvesting machine according to any one of the first to fourth aspects, the grain tank (7) is rotatably supported by one side of the grain tank (7). a support shaft (30) in the up-and-down direction, the grain tank (7) is configured not to interfere with the urea water tank (25) and the water supply port (25A) of the urea water tank (25) with the aforementioned support shaft (30) ) rotates for the center.

According to the sixth aspect of the invention, the combine harvester according to the fifth aspect is provided with a rotation restricting member (35) that restricts the rotation angle of the grain tank (7) centering on the support shaft (30).

The combiner according to any one of the first to fourth aspects of the present invention, the DOC (Diesel Oxidation Catalyst; diesel oxidation touch) which oxidizes the unburned gas in the exhaust gas discharged from the engine (E) Medium (21) is provided on the aforementioned SCR catalyst (22) in the exhaust gas flow path The part on the side of the tour.

According to the creation described in the first aspect, the urea water tank (25) can be effectively disposed in the space between the side wall of the grain tank (7) and the valley portion (8A), and the side wall of the grain tank (7) is not required. Since the recess for accommodating the urea water tank (25) is formed, the storage capacity of the grain tank (7) can be ensured, and the efficiency of the harvesting operation can be improved.

According to the creation described in the second aspect, in addition to the effects of the creation described in the first aspect, the communication portion (18) that connects the bottom of the grain tank (7) and the lower portion of the valley portion (8A) can be effectively utilized. A urea water tank (25) is disposed in a space formed on the upper side.

According to the creation described in the third aspect, in addition to the effects of the creation described in the second aspect, the urea water tank (25) can be firmly secured by the support members (41, 42) provided on the side of the communication portion (18). Supported on the upper side of the communication portion (18).

According to the creation described in the fourth aspect, in addition to the effects of the creation described in the third aspect, the urea water tank (25) can be disposed on the first support member (41) disposed on one side of the communication portion (18). The second support member (42) on the other side of the communication portion (18) is more firmly supported on the upper side of the communication portion (18).

According to the creation described in the fifth aspect, in addition to the effect of the creation described in any one of the first to fourth aspects, even if the grain tank (7) is rotated about the support shaft (30) in the up and down direction, the grain tank (7) It will not interfere with the urea water tank (25) and the water supply port (25A) of the urea water tank (25), so the urine The water tank (25) and the water supply port (25A) are hard to break, and even if the grain tank (7) is rotated, the hose that has been wired from the urea water tank (25) to the SCR catalyst (22) side will not Moves, so the durability of the hose can be improved.

According to the creation described in the sixth aspect, in addition to the effects of the creation described in the fifth aspect, the grain tank (7) is prevented from being excessively rotated, and the grain tank (7) and the urea water tank (25) can be more reliably prevented. Interference of the water supply port (25A).

According to the creation described in the seventh aspect, in addition to the effects of the creation described in any one of the first to fourth aspects, the unburned gas in the exhaust gas discharged from the engine (E) is oxidized by DOC (21) to oxidize. The nitrogen oxides in the after-gas are reduced by the SCR catalyst (22), whereby the purification of the exhaust gas can be promoted.

1‧‧‧ body frame

2‧‧‧Traveling device

2A‧‧‧ Tracks

3‧‧‧ Harvesting device

4‧‧ ‧ threshing device

5‧‧‧Management Department

6‧‧‧ engine room

7‧‧‧ Grain bin

8‧‧‧Draining spiral (grain discharge device)

8A‧‧‧Yanggu Department

8B‧‧‧ horizontal discharge spiral

9‧‧‧The first Yanggu tube

10‧‧‧Second Yanggu tube

11, 12, 13, 14‧‧ ‧ connecting pipe

15‧‧‧Wiring

16‧‧‧ Front side communication

17‧‧‧ Back side communication

18‧‧‧Connecting Department

20‧‧‧Exhaust gas purification device

21‧‧‧DOC

22‧‧‧SCR catalyst

23‧‧‧Injection device

24‧‧‧Supply device

25‧‧‧Urea water tank

25A‧‧‧Water supply port

25B‧‧‧Sensor

26‧‧‧fuel tank

30‧‧‧First support shaft (support shaft)

31‧‧‧Second support shaft

32‧‧‧Bucked parts

35‧‧‧Rotation limiting parts

36‧‧‧Support

36A‧‧‧ first side

36B‧‧‧ second side

36C‧‧‧ third side

36D‧‧‧ fourth side

36E‧‧‧ fifth side

37‧‧‧Restrictions

37A‧‧‧Mobile Department

37B‧‧‧The Ministry of Restriction

40‧‧‧Setting

41‧‧‧First support member (support member)

42‧‧‧Second support member (support member)

50‧‧‧Exhaust pipe

51‧‧‧Inside tail cover

52‧‧‧Outer tail cover

53‧‧‧Connected parts

55, 64C‧‧‧Support shaft

56‧‧‧Baffle

57‧‧ ‧ sales

60‧‧‧swing cylinder

61‧‧‧Pitching cylinder

62‧‧‧ Driving Frame

63‧‧‧lower runner

64‧‧‧arm

64A‧‧‧Upper side arm

64B‧‧‧ lower arm

65‧‧‧Upper runner

66‧‧‧Inside runner

66A‧‧‧Circle

66B‧‧‧Protruding

66C, 67A‧‧‧ openings

67‧‧‧Outside runner

67B‧‧‧Incision Department

67C‧‧‧ fastening department

E‧‧‧ engine

Figure 1 is a left side view of the combine harvester.

Figure 2 is a right side view of the combine harvester.

Fig. 3 is a right side view showing the purification device.

Fig. 4 is a plan view showing the purification device.

Fig. 5 is a rear elevational view showing the purification device.

Fig. 6 is a view for explaining a stage for supporting a urea aqueous solution tank, wherein (a) of Fig. 6 is a plan view, (b) of Fig. 6 is a rear view, and (c) of Fig. 6 is a right side view.

Fig. 7 is a rear elevational view showing the urea aqueous solution tank.

Fig. 8 is a right side view showing the urea aqueous solution tank.

Fig. 9 is a right side view for explaining the rotation restricting member.

Fig. 10 is a plan view for explaining a peripheral portion of a support shaft that supports the grain tank.

Fig. 11 is a view for explaining a baffle provided at an inner guide portion of an upper portion of an exhaust pipe, wherein (a) of Fig. 11 is a rear view, and (b) of Fig. 11 is a right side view.

Figure 12 is a left side view of the traveling device.

Figure 13 is a rear elevational view of the periphery of the upper runner.

Fig. 14 is a view for explaining the inner runner of the upper runner, wherein (a) in Fig. 14 is a left side view, and (b) in Fig. 14 is a rear view.

Fig. 15 is a view for explaining the outer runner of the upper runner, wherein (a) in Fig. 15 is a left side view, and (b) in Fig. 15 is a rear view.

Figure 16 is a cross-sectional view of the upper runner.

This creation is explained with reference to the drawings. In addition, from the viewpoint of the operator, the front side is the front side, the rear side is the rear side, the right hand side is the right side, and the left hand side is the left side.

As shown in FIGS. 1 and 2, in the combine, a traveling device 2 composed of a pair of right and left crawlers 2A traveling on the soil surface is provided on the lower side of the body frame 1, and is provided on the front side of the body frame 1. The harvesting device 3 for harvesting the barn of the farmland is provided with a threshing device 4 for performing threshing and screening treatment on the harvested grain bar on the left side of the rear side of the harvesting device 3, and is provided on the rear right side of the harvesting device 3 The manipulating portion 5 for the operator to ride. Thereby, the manipulation portion 5 is disposed on the right front portion of the threshing device 4.

An engine room 6 on which the engine E is mounted is provided on the lower side of the control unit 5, and a grain tank 7 for storing the grain after the threshing and the screening process is provided on the rear side of the operation unit 5, and the grain tank 7 is stored in the grain tank 7 The back side is set up by the grain outward A discharge spiral (a "grain discharge device") 8 composed of a valley portion 8A extending in the vertical direction and a horizontal discharge auger 8B extending in the front-rear direction.

As shown in FIGS. 3 to 5, the lower portion of the right wall of the threshing device 4 and the upper portion of the left wall of the grain tank 7 are the first ones to carry the grain after the threshing device 4 is threshed and screened. The trough tube 9 is connected. Further, on the rear side of the first lift cylinder 9 on the right wall of the threshing apparatus 4, a second lifter cylinder for returning the second material such as burrs to the second processing chamber of the threshing apparatus 4 is provided. 10.

The exhaust gas after the combustion of the engine E is purified by the exhaust purification device 20 and then discharged to the outside. The exhaust gas purification device 20 is formed of a DOC 21 as a catalyst for oxidizing exhaust gas in the exhaust gas, and nitrogen oxides in the exhaust gas discharged from the DOC 21 as ammonia generated from an aqueous urea solution (hereinafter referred to as urea water). The reduced and purified SCR catalyst 22; the injection device 23 that injects the urea water into the connection pipe 12 of the DOC 21 and the SCR catalyst 22; the supply device 24 that serves as the pump that supplies the urea water to the injection device 23; and the storage to the supply device 24 A urea water tank 25 for supplying urea water.

The exhaust port of the engine E and the inflow port formed in the lower portion of the DOC 21 disposed to face the up-and-down direction of the exhaust gas flow are connected by a connecting pipe 11 having a flexible portion. The inflow port formed in the upper portion of the DOC 21 and the inflow port formed in the rear portion of the SCR catalyst 22 disposed to face the front-rear direction of the exhaust gas flow direction are connected by a connecting pipe 12 having a flexible portion. Further, an injection device 23 is provided at a portion on the upstream side of the connection pipe 12. Exhaust gas is connected to the outflow port formed at the front portion of the SCR catalyst 22 Tube 50.

In the case of the side view of the body, the DOC 21 and the SCR catalyst 22 are disposed between the front wall of the grain tank 7 and the first lifter cylinder 9. In the left-right direction, the DOC 21 and the SCR catalyst 22 are disposed between the threshing apparatus 4 and the grain tank 7, and more specifically, the SCR catalyst 22 is disposed at the bottom which is formed obliquely to the lower right of the grain tank 7. The underside of the wall. Thereby, the DOC 21 and the SCR catalyst 22 can be disposed without reducing the capacity of the grain tank 7, and the DOC 21 and the SCR catalyst 22 can be prevented from coming into direct contact with rainwater, direct sunlight, and high-pressure water during car washing.

The water suction port of the injection device 23 and the water supply port of the supply device 24 are connected by a flexible connecting pipe 13. Further, the front portion of the connecting pipe 13 is disposed at a position higher than the injection device 23. Thereby, even when the urea water is frozen, a predetermined amount of unfrozen urea water can be supplied to the injection device 23. Moreover, a connection pipe (not shown) that returns the high-temperature cooling water cooled by the engine E to the radiator is disposed along the connection pipe 13. Thereby, freezing of the urea water in the connection pipe 13 can be prevented, and the urea water in the frozen connection pipe 13 and in the urea water tank 25 can be melted.

In the front-rear direction, the supply device 24 is disposed between the lower portion of the first lift cylinder 9 on the rear side of the injection device 23 and the lower portion of the second lift cylinder 10, and more specifically, the second lift tube Near the 10th. In the left-right direction, the supply device 24 is disposed between the lower portion of the second lift cylinder 10 and the grain tank 7, and more specifically, the bottom wall of the bottom of the grain tank 7 which is formed obliquely downward to the right. Lower side. Thereby, the first lifter cylinder 9 can be turned back, and the connection pipe 13 can be easily disposed on the right side of the first lifter cylinder 9. another Further, it is possible to effectively utilize the space formed on the lower side of the bottom wall of the grain tank 7 which is inclined downward to the right.

The water suction port of the supply device 24 and the water supply port of the urea water tank 25 are connected by a flexible connecting pipe 14. Further, the connecting pipe 14 is disposed at a position higher than the supply device 24. Thereby, even when the urea water is frozen, a predetermined amount of unfrozen urea water can be supplied to the supply device 24. Further, an internal switching system between the water suction port of the supply device 24 and the water supply port of the urea water tank 25 is provided with an opening and closing valve, and a harness 15 for energizing the opening and closing valve is connected to the opening and closing valve. Thereby, when the urea water stored in the urea water tank 25 is lower than the predetermined temperature range or high temperature, the opening and closing valve can be closed to stop the supply of urea water from the urea water tank 25 to the supply device 24. Further, the temperature of the urea water is measured by a sensor 25B provided at the upper portion of the urea water tank 25.

In the front-rear direction, the urea water tank 25 is disposed in a space formed between the rear wall (the "side wall" of the scheme) and the valley portion 8A of the grain tank 7. In the left-right direction, the urea water tank 25 is disposed at a position shifted to the right side from the center in the left-right direction of the grain tank 7, and the water supply port 25A of the urea water tank 25 is formed from the upper right side of the urea water tank 25. The inclined wall that is inclined at the lower right is formed to protrude in an upwardly inclined posture. Thereby, urea water can be easily supplied to the water supply port 25A of the urea water tank 25 from the outside of the machine body, and the urea water tank 25 can be prevented from colliding with an external obstacle and being damaged.

A conveying screw that transports the grain leaked from the grain tank 7 to the rear side is provided at the bottom of the grain tank 7, and is behind the grain tank 7 in the conveying screw. A cylindrical front side communication portion 16 is provided on the outer periphery of the portion where the side wall protrudes rearward. Further, an L-shaped grain passage is formed in the lower portion of the valley portion 8A, and a rear side communication portion 17 is provided, and the rear side communication portion 17 is provided with a conveying screw provided at the bottom of the grain tank 7. A bevel gear interlocking mechanism (not shown) that interlocks with the rear end portion and the lower end portion of the transport screw built in the lifter portion 8A. When the grain tank 7 is located at the storage position (harvesting operation position) on the body frame 1, the rear end surface of the front side communication portion 16 is joined to the front end surface of the rear side communication portion 17, and the front side communication portion 16 and the rear side communication portion are joined. 17 connected. On the other hand, when the grain tank 7 is rotated to the outside and moved to the open position (maintenance position) where the front portion of the grain tank 7 moves to the right side of the body frame 1, the rear end face of the front side communication portion 16 The engagement with the front end surface of the rear side communication portion 17 is separated, and the communication between the front side communication portion 16 and the rear side communication portion 17 is released. Further, in the present specification, the front side communication portion 16 and the rear side communication portion 17 are collectively referred to as a communication portion 18. Further, a support shaft that supports a tension arm of a tension clutch is provided in a stay provided in the body frame 1, and the tension clutch rotates the engine E toward the valley portion 8A. The conveyor screw drive inside.

The urea water tank 25 is disposed above the communication portion 18, and the water supply port of the urea water tank 25 is disposed above the water suction port of the supply device 24. Thereby, the space formed on the upper side of the communication portion 18 can be effectively utilized, and the urea water can be easily supplied from the urea water tank 25 to the supply device 24. Further, a fuel tank 26 that stores light oil supplied to the engine E is disposed in a lower portion of the rear wall of the threshing apparatus 4.

As shown in Fig. 6, the urea water tank 25 is supported by a plate-shaped mounting table 40 provided on the upper side of the communicating portion 18, and the left portion of the mounting table 40 is attached to the upper side from the left side of the rear side communicating portion 17 of the body frame 1. After being extended, it is bent and fixed to the first support member 41 extending to the right side, and the right portion of the table 40 is attached to the right side of the rear side communication portion 17 of the body frame 1, and more specifically, from the rear side communication portion 17 The right side of the right side extends to the upper side, and is bent to be fixed to the second support member 42 extending toward the front side. Further, in a side view, the first support member 41 is disposed on the front side of the second support member 42. Thereby, the communication portion 18 extending in the front-rear direction can be disposed between the first support member 41 and the second support member 42, and the rear communication portion 17 can be prevented from moving to move the grain tank 7 to the open position. Under the obstacles. Further, the first support member 41 and the second support member 42 are collectively referred to as a support member.

As shown in FIGS. 7 to 9, the grain tank 7 is rotated in the left-right direction centering on the first support shaft (the "support shaft" of the scheme) 30 and the second support shaft 31, and the first support shaft 30 is disposed in the center. The frame portion 8A extends longitudinally and rotatably and extends in the vertical direction. The second support shaft 31 is provided on the outer side of the separation surface of the front side communication portion 16 and the rear side communication portion 17, and extends in the vertical direction. Further, the first support shaft 30 and the second support shaft 31 are disposed on the same axis extending in the up and down direction. In other words, the rear end outer side portion of the front side communication portion 16 and the front end outer side portion of the rear side communication portion 17 are rotatably coupled to each other through the second support shaft 31.

In the left-right direction, the first support shaft 30 and the second support shaft 31 are disposed on the side of the water supply port 25A from the center in the left-right direction of the urea water tank 25 In the position of the offset, in the front-rear direction, the first support shaft 30 and the second support shaft 31 are disposed at positions shifted toward the rear side from the center in the front-rear direction of the urea water tank 25. In addition, the upper portion of the rear wall of the grain tank 7 and the first support shaft 30 are rotatably coupled via a connecting member (not shown), and are fixed to the rear side communication portion 16 of the lower portion of the rear wall of the grain tank 7. The front end portions of the end portion and the rear side communication portion 17 are rotatably coupled to each other through the second support shaft 31. Thereby, the grain tank 7 can be rotated around the first support shaft 30 and the second support shaft 31, and can be easily moved from the storage position on the body frame 1 to the open position on the outer side of the body frame 1, or can be easily The ground moves from the open position to the storage position.

An engaged member 32 is externally fitted to the lower portion of the first support shaft 30. Further, a rotation restricting member 35 that restricts the rotation of the grain tank 7 is provided in the rear wall of the grain tank 7. The rotation restricting member 35 is composed of a support portion 36 that protrudes toward the first support shaft 30 and forms a substantially mountain shape, and the first support shaft 30 is disposed behind the grain tank 7 The wall is located above the portion facing the engagement member 32, and the restriction portion 37 extends from the rear end portion of the support portion 36 toward the first support shaft 30 to form a substantially Word shape.

The support portion 36 is formed by bending a plate-shaped metal plate, and is formed of the following members in a plan view: a first side 36A extending in the left-right direction, and a first extending from the right end portion of the first side 36A toward the rear right side. a second side 36B; a third side 36C extending from the right end of the second side 36B to the right side; a fourth side 36D extending from the right end of the third side 36C to the front right side; and a right side to the right side of the fourth side 36D The fifth side 36E extends. another Further, the first side 36A and the fifth side 36E are detachably fixed to the rear wall of the grain tank 7 by a fastening mechanism such as a bolt. Thereby, the engagement position of the engagement part 37B of the restriction part 37 and the engagement member 32 can be adjusted, and the rotation angle of the grain tank 7 can be adjusted.

The restricting portion 37 is formed by bending a plate-shaped metal plate, and is configured by a member in a plan view: a moving portion 37A extending along the fourth side 36D of the support portion 36 and a rear end portion from the moving portion 37A The engaging portion 37B extends to the right rear side. Further, the moving portion 37A is detachably fixed to the fourth side 36D of the support portion 36 by a fastening mechanism such as a bolt. Thereby, the engagement position of the engagement portion 37B of the restriction portion 37 and the engaged member 32 can be adjusted to adjust the rotation restriction angle of the grain tank 7.

As shown in FIG. 10, when the grain tank 7 is located in the storage position, the engagement part 37B of the restriction part 36 isolates from the to-be-engaged member 32. On the other hand, when the grain tank 7 is in the open position, the engaging portion 37B of the restricting portion 36 abuts against the engaged member 32, and restricts the rotation of the grain tank 7. Thereby, the excessive rotation of the grain tank 7 is suppressed, and the rear wall of the grain tank 7 can be prevented from interfering with the water supply port 25A of the urea water tank 25, and the storage capacity of the grain tank 7 can be ensured, and the grain tank 7 can be made into the 1st support shaft. The center of the 30 and the second support shaft 31 is easily rotated.

As shown in FIG. 11, an exhaust cover 51 having an open rear side is provided in the exhaust port of the exhaust pipe 50, and an outer tail cover 52 having a rear side open is provided on the outer side of the inner tail cover 51. Thereby, the outer tail cover 52 is not excessively heated by the exhaust gas discharged from the exhaust pipe 50, and dust such as swarf accumulated on the outer tail cover 52 can be prevented from being ignited. In addition, the inner tail cover 51 is fixed In the front portion of the exhaust port of the exhaust pipe 50, the outer tail cap 52 is detachably fixed to the inner tail cap 51 through the connecting member 53 provided at the front portion of the inner tail cap 51.

A support shaft 55 extending in the left-right direction is provided at the rear of the outer tail cover 52. The support shaft 55 is rotatably and externally embedded with a plate-shaped metal plate substantially reversed The lower portion of the baffle 56 formed by the meandering of the shape is formed in a substantially mesa shape matching the inner peripheral shape of the inner tail cap 51. Further, in the side view, a pin 57 extending toward the inner peripheral portion of the inner tail cover 51 is provided on the upper side of the support shaft 55 of the inner tail cover 51. Thereby, when the exhaust gas is discharged to the outside from the exhaust port of the exhaust pipe 50, the shutter 56 is rotated counterclockwise about the axial center of the support shaft 55, and the inner peripheral portion of the inner tail cap 51 is opened. On the other hand, when the exhaust gas is not discharged to the outside from the exhaust port of the exhaust pipe 50, the shutter 56 is rotated clockwise around the axis of the support shaft 55, and the inner peripheral portion of the inner tail cap 51 is closed. . Thereby, when the exhaust gas is not discharged to the outside, it is possible to prevent rainwater from entering the inside of the exhaust pipe 50.

As shown in FIG. 12, a rolling cylinder 60 that adjusts the height of the body in the left-right direction is provided in the intermediate portion in the front-rear direction of the body frame 1, and the front and rear directions of the body are adjusted on the rear side of the swing cylinder 60. The height of the pitching cylinder 61.

The traveling frame 62 that is provided in the front-rear direction on the lower side of the body frame 1 is provided with a plurality of lower turning wheels 63 that abut against the inner peripheral surface of the running side of the crawler belt 2A of the traveling device 2 . Further, the rod front end portion of the swing cylinder 60 and the rear portion of the traveling frame 62 are coupled by an arm 64.

In the side view, the arm 64 is formed of an upper arm 64A that linearly extends from the front end portion of the swing cylinder 60 toward the traveling frame 62, and a lower portion from the lower portion of the upper arm 64A toward the rear of the traveling frame 62. The lower side arm 64B is formed in a word shape. In addition, an upper reel 65 that abuts against the inner peripheral surface of the crawler belt 2A of the traveling device 2 on the reverse traveling side is provided on the top of the lower arm 64B, and the front portion of the lower arm 64B is rotatably fixed to the upper side. A support shaft 64C extending in the left-right direction of the lower portion of the arm 64A.

As shown in FIGS. 13 to 15, the upper reel 65 is fixed to the inner runner 66 supported by the traveling frame 62 by a fastening mechanism such as a bolt, and the outer runner 67 is integrally formed. Further, the contact width of the outer runner 67 that abuts against the inner peripheral portion of the crawler belt 2A in the left-right direction is formed to be larger than the contact width of the inner runner 66 in the left-right direction. Thereby, the swing cylinder 60 can be operated to adjust the height of the body in the left-right direction.

The portion of the inner runner 66 that fixes the outer runner 67 is formed by a circumferential portion 66A having a predetermined diameter and a projection portion 66B that protrudes in the radial direction at intervals of 120 degrees in the circumferential direction. Further, an opening 66C through which the fastening mechanism is inserted is formed in the protruding portion 66B.

The outer runner 67 is formed of a circumferential opening portion 67A having a predetermined diameter that can be inserted into the circumferential portion 66A of the inner runner 66, and can be inserted through the inner side at intervals of 120 degrees in the circumferential direction. A substantially semi-arc-shaped cutout portion 67B of the protruding portion 66B of the runner 66. Further, a fastening portion 67C that fixes the fastening mechanism is formed between the cutout portion 67B and the cutout portion 67B.

As shown in FIG. 16, when the outer runner 67 is fixed to the inner runner 66, first, the opening portion 67A of the outer runner 67, the notched portion 67B, and the circumferential portion 66A and the protruding portion 66B of the inner runner 66 are provided. The positions are aligned so that the outer runner 67 moves inward from the outer side of the inner runner 66. Next, the outer runner 67 is rotated by 120 degrees, and the positions of the fastening portion 67C of the outer runner 67 and the opening portion 66C of the inner runner 66 are aligned. Next, the fastening mechanism is inserted from the outside to the opening 66C of the inner runner 66 and the fastening portion 67C of the outer runner 67 and fastened. Thereby, the replacement work of the crawler belt 2A can be performed easily.

Claims (7)

A combine harvester comprising: an exhaust gas purification device (20) for purifying exhaust gas of an engine (E); and a valley portion (8A) of the grain discharge device (8) provided in the grain tank (7) The exhaust gas purification device (20) includes a selective catalyst reduction catalyst (22) for reducing nitrogen oxides in the exhaust gas discharged from the engine (E) with ammonia generated from the urea water. Purification; a urea water tank (25) storing urea water is disposed in a space between the side wall of the grain tank (7) and the aforementioned valley portion (8A). The combine harvester according to claim 1, wherein the urea water tank (25) is disposed on an upper side of a communicating portion (18) that communicates with a bottom portion of the grain tank (7) and a lower portion of the valley portion (8A). . The combine harvester according to claim 2, wherein the urea water tank (25) is supported by support members (41, 42) provided on the side of the communication portion (18). A combine harvester according to claim 3, wherein the first support member (41) disposed on one side of the communication portion (18) and the second support member disposed on the other side of the communication portion (18) (42) The aforementioned support members (41, 42) are formed. The combine harvester according to any one of claims 1 to 4, wherein the grain tank (7) is rotatably supported by a support shaft arranged in the vertical direction on one side of the grain tank (7) ( 30), the grain box (7) structure The rotation is centered on the support shaft (30) without interfering with the urea water tank (25) and the water supply port (25A) of the urea water tank (25). The combine harvester according to claim 5, wherein a rotation restricting member (35) that restricts a rotation angle of the grain tank (7) centering on the support shaft (30) is provided. A combine harvester according to any one of claims 1 to 4, wherein a diesel oxidation catalyst (21) for oxidizing unburned gas in the exhaust gas discharged from the engine (E) is provided in the exhaust gas flow path as described above The sexual catalyst reduces the portion on the upstream side of the catalyst (22).