Combine

Abstract

To provide a combine capable of suppressing a rise in a hydraulic oil temperature.SOLUTION: A combine includes a travelling machine body mounted with a threshing part having a threshing cylinder and an engine. A reaping part is provided on the front part of the threshing part, and reaped grain culms conveyed from the reaping part are fed to the threshing part. The engine is disposed on one side in a machine body width direction of the travelling machine body, and a hydraulic oil tank is disposed on the other side in the machine body width direction of the travelling machine body. A hydraulic valve unit for switching the flow of hydraulic oil is provided on the travelling machine body. The hydraulic valve unit is connected to the hydraulic oil tank by hydraulic piping. A radiator and a cooling fan for blowing air on the other side in the machine body width direction are provided on one side in the machine body width direction of the engine.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a combine harvester equipped with a cutting unit for cutting uncut cereal straws in a field and a threshing unit for threshing the grains of the cut cereal straws.

Background Art

[0002] Conventionally, in a conventional combine harvester equipped with a feeder house for conveying the cereal straws cut by the cutting unit to the handling cylinder, there is a technique of providing a beater for feeding cereal straws to the cutting unit between the end of the feeder house and the inlet of the handling cylinder to improve the intake property of the cut cereal straws into the handling cylinder (see Patent Document 1). Also, in a self-threshing combine harvester equipped with a feed chain for conveying the cereal straws cut by the cutting unit to the handling cylinder, a technique has been proposed to store the hydraulic oil supplied to the continuously variable transmission for traveling in a hydraulic oil tank (see Patent Documents 2 and 3). Furthermore, in a conventional combine harvester, there is a technique of providing a hydraulic pump and a hydraulic motor in the left and right traveling units to drive the left and right traveling units (see Patent Document 4).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0004] The prior arts shown in Patent Documents 1 to 4 describe a combine harvester in which the hydraulic oil tank is arranged on the traveling body.

[0005] The present invention aims to provide a combine harvester capable of suppressing an increase in the temperature of the hydraulic oil.

Means for Solving the Problems

[0006] To achieve the above object, the combine harvester of the present invention includes a traveling machine body equipped with a threshing unit having a threshing cylinder and an engine. A cutting unit is provided at the front of the threshing unit. In the combine harvester for feeding the cut crop straws conveyed from the cutting unit into the threshing unit, the engine is disposed on one side in the machine width direction of the traveling machine body, a hydraulic oil tank is disposed on the other side in the machine width direction of the traveling machine body, a hydraulic valve unit for switching the flow of the hydraulic oil is provided on the traveling machine body, the hydraulic valve unit is connected to the hydraulic oil tank by a hydraulic pipe, and a radiator and a cooling fan for blowing air toward the other side in the machine width direction are provided on one side in the machine width direction of the engine.

Effects of the Invention

[0007] According to the present invention, an increase in the temperature of the hydraulic oil can be suppressed.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments embodying the present invention will be described based on the drawings (FIGS. 1 to 10) applied to a conventional combine. FIG. 1 is a left side view of the combine, FIG. 2 is a right side view thereof, and FIG. 3 is a plan view thereof. First, with reference to FIGS. 1 to 3, the schematic structure of the combine will be described. In the following description, the left side toward the forward direction of the traveling body 1 is simply referred to as the left side, and the right side toward the forward direction is simply referred to as the right side.

[0010] As shown in FIGS. 1 to 3, the conventional combine in the embodiment includes a traveling body 1 supported by a pair of left and right rubber crawler belts 2 as a traveling unit. At the front part of the traveling body 1, a cutting unit 3 for taking in uncut cereal straws such as rice (or wheat or soybeans or corn) while cutting is mounted so as to be vertically adjustable by a single-acting lifting hydraulic cylinder 4.

[0011] On the left side of the traveling body 1, a threshing unit 9 for threshing the harvested cereal straw supplied from the harvesting unit 3 is mounted. At the lower part of the threshing unit 9, a grain sorting mechanism 10 for performing swinging sorting and winnowing is arranged. On the front right side of the traveling body 1, a driver's cab 5 on which an operator rides is mounted. An engine 7 as a power source is arranged under the driver's cab 5 (under the driver's seat 42). Behind the driver's cab 5 (on the right side of the traveling body 1), a grain tank 6 for taking out grains from the threshing unit 9 and a grain discharge conveyor 8 for discharging the grains in the grain tank 6 toward a truck bed (or a container, etc.) are arranged. The grain discharge conveyor 8 is configured to be tilted outward of the machine to carry out the grains in the grain tank 6 by the grain discharge conveyor 8.

[0012] The harvesting unit 3 includes a feeder house 11 communicating with a handling port 9a at the front of the threshing unit 9, and a horizontally long bucket-shaped grain header 12 connected to the front end of the feeder house 11. A scraping auger 13 (platform auger) is rotatably supported in the grain header 12. A scraping reel 14 with tine bars is arranged above the front part of the scraping auger 13. A sickle-shaped cutting blade 15 is arranged at the front part of the grain header 12. Left and right weed separating bodies 16 are projected on both the left and right sides of the front part of the grain header 12. Further, a supply conveyor 17 is provided inside the feeder house 11. A harvested cereal straw input beater 18 (front rotor) is provided at the feeding end side (handling port 9a) of the supply conveyor 17. The lower surface part of the feeder house 11 and the front end part of the traveling body 1 are connected via a lifting hydraulic cylinder 4, and the harvesting unit 3 moves up and down by the harvesting lifting hydraulic cylinder 4 with a harvesting input shaft 89 (feeder house conveyor shaft) described later as a lifting fulcrum.

[0013] With the above configuration, the ear tip sides of the uncut cereal straws between the left and right straw dividing bodies 16 are scraped in by the scraping reel 14, the stalk base sides of the uncut cereal straws are cut by the cutting blade 15, and by the rotational drive of the scraping auger 13, the cut cereal straws are collected near the entrance of the feeder house 11 closer to the center of the left and right widths of the grain header 12. The total amount of the cut cereal straws of the grain header 12 is conveyed by the supply conveyor 17 and configured to be put into the handling port 9a of the threshing unit 9 by the beater 18. Note that a horizontal control hydraulic cylinder (not shown) for rotating the grain header 12 around the horizontal control fulcrum shaft is provided, and the inclination of the grain header 12 in the left-right direction is adjusted by the horizontal control hydraulic cylinder so that the grain header 12, the cutting blade 15, and the scraping reel 14 can be supported horizontally with respect to the field surface.

[0014] Also, as shown in FIGS. 1 and 3, a handling cylinder 21 is rotatably provided in the handling chamber of the threshing unit 9. The handling cylinder 21 is pivotally supported on a handling cylinder shaft 20 (see FIG. 4) extending in the front-rear direction of the traveling machine body 1. A receiving net 24 for allowing grains to leak through is stretched below the handling cylinder 21. Note that on the outer peripheral surface of the front portion of the handling cylinder 21, spiral screw blade-like intake blades 25 project radially outward.

[0015] With the above configuration, the cut cereal straws input from the handling port 9a by the beater 18 are kneaded and threshed between the handling cylinder 21 and the receiving net 24, etc. while being conveyed rearward of the traveling machine body 1 by the rotation of the handling cylinder 21. Threshed materials such as grains smaller than the mesh of the receiving net 24 leak through the receiving net 24. Straw scraps, etc. that do not leak through the receiving net 24 are discharged from the dust exhaust port 23 at the rear of the threshing unit 9 to the field by the conveying action of the handling cylinder 21.

[0016] Note that a plurality of dust sending valves (not shown) for adjusting the conveying speed of the threshed materials in the handling chamber are pivotally attached rotatably above the handling cylinder 21. By adjusting the angle of the dust sending valve, the conveying speed (residence time) of the threshed materials in the handling chamber can be adjusted according to the variety and properties of the cut cereal straws. On the other hand, as a grain sorting mechanism 10 disposed below the threshing unit 9, a swing sorting board 26 for specific gravity sorting having a grain pan, a chaff sieve, a grain sieve, a straw rack, etc. is provided.

[0017] In addition, as the grain sorting mechanism 10, it is provided with a winnowing fan-shaped threshing tray 29 or the like that supplies sorting air to the oscillating sorting tray 26. The threshed grains that have passed through the threshing cylinder 21 and leaked from the receiving net 24 are sorted and taken out into grains (first-class products such as polished grains), mixtures of grains and straws (second-class products such as grains with branches), and straw scraps, etc. by the specific gravity sorting action of the oscillating sorting tray 26 and the air sorting action of the winnowing fan-shaped threshing tray 29.

[0018] On the lower side of the oscillating sorting tray 26, as the grain sorting mechanism 10, it is provided with a first conveyor mechanism 30 and a second conveyor mechanism 31. By the sorting of the oscillating sorting tray 26 and the winnowing fan-shaped threshing tray 29, the grains (first-class products) that have fallen from the oscillating sorting tray 26 are collected in the grain tank 6 by the first conveyor mechanism 30 and the elevating conveyor 32. The mixture of grains and straws (second-class products) is returned to the sorting start end side of the oscillating sorting tray 26 via the second conveyor mechanism 31 and the second return conveyor 33, etc., and is re-sorted by the oscillating sorting tray 26. The straw scraps, etc. are configured to be discharged from the dust outlet 23 at the rear of the traveling machine body 1 to the field.

[0019] Furthermore, as shown in FIGS. 1 to 3, on the operator's cab 5, a steering column 41 and a driver's seat 42 on which the operator sits are arranged. On the steering column 41, an accelerator lever 40 for adjusting the rotation speed of the engine 7, a round-shaped steering handle 43 for changing the course of the traveling machine body 1 by the rotational operation of the operator, a main transmission lever 44 and a sub-transmission lever 45 for switching the moving speed of the traveling machine body 1, a cutting clutch lever 46 for driving or stopping the cutting unit 3, and a threshing clutch lever 47 for driving or stopping the threshing unit 9 are arranged. Also, a sunshade roof body 49 is attached to the front upper surface side of the grain tank 6 via a sunshade support column 48, and is configured to cover the upper side of the operator's cab 5 with the sunshade roof body 49.

[0020] As shown in FIGS. 1 and 2, left and right track frames 50 are arranged on the lower surface side of the traveling body 1. The track frame 50 is provided with a drive sprocket 51 that transmits the power of the engine 7 to the crawler 2, a tension roller 52 that maintains the tension of the crawler 2, a plurality of track rollers 53 that hold the grounded side of the crawler 2 in a grounded state, and an intermediate roller 54 that holds the non-grounded side of the crawler 2. The front side of the crawler 2 is supported by the drive sprocket 51, the rear side of the crawler 2 is supported by the tension roller 52, the grounded side of the crawler 2 is supported by the track rollers 53, and the non-grounded side of the crawler 2 is supported by the intermediate roller 54.

[0021] Next, the drive structure of the combine will be described with reference to FIGS. 4 to 8. As shown in FIGS. 4 and 7, a direct-acting hydraulic continuously variable transmission 64 for traveling speed change having a hydraulic direct-acting pump 64a and a hydraulic direct-acting motor 64b is provided in the transmission case 63. The engine 7 is mounted on the upper right surface of the front part of the traveling body 1, and the transmission case 63 is arranged in the front part of the traveling body 1 on the left side of the engine 7. The output shaft 65 protruding leftward from the engine 7 and the transmission input shaft 66 protruding leftward from the transmission case 63 are connected via an engine output belt 67, an engine output pulley 68, and a transmission input pulley 69.

[0022] Further, a swivel hydraulic continuously variable transmission 70 for steering having a hydraulic swivel pump 70a and a hydraulic swivel motor 70b is provided in the transmission case 63. The output of the engine 7 is transmitted to the direct-acting hydraulic continuously variable transmission 64 and the swivel hydraulic continuously variable transmission 70 via the transmission input shaft 66. On the other hand, the direct-acting hydraulic continuously variable transmission 64 and the swivel hydraulic continuously variable transmission 70 are output-controlled by the steering wheel 43, the main speed change lever 44, and the sub-speed change lever 45, and the left and right crawlers 2 are driven via the direct-acting hydraulic continuously variable transmission 64 and the swivel hydraulic continuously variable transmission 70 to travel and move in a field or the like.

[0023] Furthermore, as shown in FIGS. 4 to 6 and FIG. 8, a handling cylinder drive case 71 that pivotally supports the front end side of the handling cylinder shaft 20 is provided. The handling cylinder drive case 71 is disposed on the front side of the threshing unit 9. A handling cylinder input shaft 72 for driving the cutting unit 3 and the handling cylinder 21 is pivotally supported by the handling cylinder drive case 71. Also, a main counter shaft 76 is provided as a constant rotation shaft that penetrates the left and right sides of the threshing unit 9. An operation unit input pulley 83 is provided at the right end of the main counter shaft 76. The right end of the main counter shaft 76 is connected to the engine output pulley 68 on the output shaft 65 of the engine 7 via a threshing clutch 84 that also serves as a tension roller and an operation unit drive belt 85.

[0024] In front of the handling cylinder 21, a handling cylinder input shaft 72 extending in the left - right direction of the traveling body 1, a beater 18 disposed in the left - right direction of the traveling body 1, and a cutting input shaft 89 extending in the left - right direction of the traveling body 1 are provided. As a handling cylinder input mechanism 90 for transmitting the driving force of the main counter shaft 76 to the handling cylinder input shaft 72, handling cylinder drive pulleys 86, 87 and a handling cylinder drive belt 88 are provided. The handling cylinder input mechanism 90 (handling cylinder drive pulleys 86, 87 and handling cylinder drive belt 88) is disposed at one end of the main counter shaft 76 on the engine 7 side where the driving force from the engine 7 is transmitted, and is configured to drive the handling cylinder 21 to rotate at a constant speed with the constant rotation output of the engine 7.

[0025] A beater drive mechanism and a cutting drive mechanism for transmitting the driving force of the main counter shaft 76 to the beater shaft 82 and the cutting input shaft 89 are provided on the other end side of the main counter shaft 76. Also, a sub - counter shaft 104 is disposed between the beater shaft 82 and the main counter shaft 76. A power relay belt 113 is wound around power relay pulleys 105, 106 provided on the main counter shaft 76 and the sub - counter shaft 104 to constitute a power relay mechanism that transmits power to the cutting drive mechanism.

[0026] Cutting drive pulleys 107 and 108 provided on the sub countershaft 104 and the beater shaft 82 respectively are wound with a cutting drive belt 114 to constitute a beater drive mechanism. And the cutting drive belt 114 is tensioned by a cutting clutch 109 that also serves as a tension roller, so that the rotational power from the engine 7 transmitted to the main countershaft 76 is input to the beater shaft 82 via the power relay mechanism and the beater drive mechanism. Also, a cutting drive mechanism is configured such that the cutting drive power from the engine 7 is transmitted from the beater shaft 82 on which the beater 18 is pivotally supported to the cutting input shaft 89 via a cutting drive chain 115 and sprockets 116 and 117. Thereby, the cutting unit 3 is driven to rotate at a constant speed with the beater 18 by a constant rotational output of the engine 7.

[0027] The beater shaft 100, which is the rotating shaft of the blower fan-shaped beater 29, has a hollow tubular shape, and the main countershaft 76 is inserted into the hollow portion of the beater shaft 100. That is, the main countershaft 76 and the beater shaft 100 have a double-shaft structure, and the main countershaft 76 and the beater shaft 100 are pivotally supported so as to be relatively rotatable with respect to each other. Also, a beater drive belt 103 is wound around beater drive pulleys 101 and 102 provided on the sub countershaft 104 and the beater shaft 100 respectively to constitute a beater drive mechanism. Therefore, the rotational power from the engine 7 transmitted to the main countershaft 76 is input to the beater shaft 82 via the power relay mechanism and the beater drive mechanism, and the beater 29 is driven to rotate at a constant speed by a constant rotational output of the engine 7.

[0028] Furthermore, the machine housing 9b of the threshing unit 9 has a cutting support frame body 36 installed on the upper surface side of the front part of the threshing machine housing support 34 on the upper surface side of the traveling machine body 1. A cutting shaft receiver 37 is attached to the right side of the front surface of the cutting support frame body 36, and a forward and reverse rotation switching case 121, which will be described later, is attached to the left side of the front surface of the cutting support frame body 36. And, via the cutting shaft receiver 37 and the forward and reverse rotation switching case 121, a cutting input shaft 89 is pivotally supported on the front surface side of the cutting support frame body 36 so as to be rotatable in the left - right direction of the traveling machine body 1, and a left - right beater shaft 82 (beater 18) is pivotally supported rotatably via a beater shaft receiver 38 inside the cutting support frame body 36. Also, a handling cylinder drive case 71 is attached to the upper surface side of the cutting support frame body 36, and a handling cylinder input shaft 72 is pivotally supported by the handling cylinder drive case 71.

[0029] On the other hand, it is provided with a left - right cutting input shaft 89 for driving the supply conveyor 17 in the feeder house 11. The cutting driving force transmitted from the engine 7 to one end on the engine 7 side of the main countershaft 76 is transmitted from the other end of the main countershaft 76 on the side opposite to the engine 7 to the forward and reverse transmission shaft 122 of the cutting forward and reverse rotation switching case 121. The cutting input shaft 89 is driven via the forward rotation bevel gear 124 or the reverse rotation bevel gear 125 of the cutting forward and reverse rotation switching case 121.

[0030] Also, a left - right handling cylinder input shaft 72 is provided on the front side of the threshing unit 9, and the driving force transmitted from the engine 7 to one end on the engine 7 side of the main countershaft 76 is transmitted to one end on the engine 7 side of the handling cylinder input shaft 72. Also, while the handling cylinder input shaft 72 provided on the front side of the threshing unit 9 is arranged in the left - right direction of the traveling machine body 1, a handling cylinder 21 is pivotally supported by a handling cylinder shaft 20 arranged in the front - rear direction of the traveling machine body 1. And, the front end side of the handling cylinder shaft 20 is connected to the left - right other ends on the side opposite to the engine 7 of the handling cylinder input shaft 72 via a bevel gear mechanism 75. The driving force of the engine 7 is transmitted from the left - right other ends on the side opposite to the engine 7 of the main countershaft 76 to a grain sorting mechanism 10 for sorting threshed grains or a cutting unit 3.

[0031] That is, the right end of the handling cylinder input shaft 72 is connected to the right end of the main countershaft 76 near the engine 7 via the handling cylinder drive pulleys 86 and 87 and the handling cylinder drive belt 88. The front end side of the handling cylinder shaft 20 is connected to the left end of the handling cylinder input shaft 72 extending in the left-right direction via a bevel gear mechanism 75. The power of the engine 7 is transmitted from the right end of the main countershaft 76 to the front end side of the handling cylinder shaft 20 via the handling cylinder input shaft 72, and the handling cylinder 21 is configured to be rotationally driven in one direction. On the other hand, the driving force of the engine 7 is transmitted from the left end of the main countershaft 76 to the grain sorting mechanism 10 disposed below the threshing unit 9.

[0032] Furthermore, the left end of the main countershaft 76 is connected to the left end of the first conveyor shaft 77 of the first conveyor mechanism 30 and the left end of the second conveyor shaft 78 of the second conveyor mechanism 31 via a conveyor drive belt 111. The left end of the second conveyor shaft 78 is connected to the left end of the crank-shaped swing drive shaft 79 that pivotally supports the rear part of the swing sorting plate 26 via a swing sorting belt 112. That is, the threshing clutch 84 is controlled to engage and disengage by the operation of the threshing clutch lever 47 of the operator. By the engaging operation of the threshing clutch 84, each part of the grain sorting mechanism 10 and the handling cylinder 21 are configured to be driven.

[0033] Note that the elevating conveyor 32 is driven via the first conveyor shaft 77, and the first sorted grains of the first conveyor mechanism 30 are collected in the grain tank 6. Also, the second reduction conveyor 33 is driven via the second conveyor shaft 78, and the second sorted grains (second products) mixed with chaff of the second conveyor mechanism 31 are returned to the upper surface side of the swing sorting plate 26. In a structure in which a spreader (not shown) for chaff scattering is provided at the dust exhaust port 23, the left end of the main countershaft 76 is connected to the spreader via a spreader drive pulley (not shown) and a spreader drive belt (not shown).

[0034] It is provided with a cutting input shaft 89 as a conveyor input shaft that pivotally supports the feed end side of the supply conveyor 17. A header drive shaft 91 is rotatably pivotally supported on the rear side of the right side portion of the grain header 12. The left end portion of the beater shaft 82 is connected to the left end portion of the forward and reverse transmission shaft 122 via a cutting drive chain 115 and sprockets 116, 117, and the cutting input shaft 89 is connected to the forward and reverse transmission shaft 122 via a forward and reverse switching case 121. Further, the right end portion of the cutting input shaft 89 is connected to the left end portion of the header drive shaft 91 extending in the left-right direction via a header drive chain 118 and sprockets 119, 120. It is provided with a raking auger shaft 93 that pivotally supports the raking auger 13. The intermediate portion of the header drive shaft 91 is connected to the right side portion of the raking auger shaft 93 via a raking drive chain 92.

[0035] It is also provided with a reel shaft 94 that pivotally supports the raking reel 14. The right end portion of the reel shaft 94 is connected to the right end portion of the raking auger shaft 93 via an intermediate shaft 95 and raking drive chains 96, 97. A cutting blade 15 is connected to the right end portion of the header drive shaft 91 via a cutting blade drive crank mechanism 98. By the engaging and disengaging operation of the cutting clutch 109, the supply conveyor 17, the raking auger 13, the raking reel 14, and the cutting blade 15 are drive-controlled so as to continuously cut the spike tip side of the uncut cereal straw in the field.

[0036] A forward rotation bevel gear 124 integrally formed on the forward and reverse transmission shaft 122, a reverse rotation bevel gear 125 rotatably pivotally supported on the cutting input shaft 89, and an intermediate bevel gear 126 that connects the reverse rotation bevel gear 125 to the forward rotation bevel gear 124 are provided inside the forward and reverse switching case 121. The intermediate bevel gear 126 is always meshed with the forward rotation bevel gear 124 and the reverse rotation bevel gear 125. On the other hand, a slider 127 is slidably spline-engaged and pivotally supported on the cutting input shaft 89. The slider 127 is configured to be detachably engageable with the forward rotation bevel gear 124 via a forward rotation clutch 128 in the shape of a claw clutch, and the slider 127 is configured to be detachably engageable with the reverse rotation bevel gear 125 via a reverse rotation clutch 129 in the shape of a claw clutch.

[0037] Further, it is provided with a forward and reverse switching shaft 123 for sliding the slider 127. A forward and reverse switching arm 130 is provided on the forward and reverse switching shaft 123. The forward and reverse switching arm 130 is swung by operating a forward and reverse switching lever 212 (forward and reverse operating tool), and the forward and reverse switching shaft 123 is rotated. The slider 127 is brought into contact with and separated from the forward bevel gear 124 or the reverse bevel gear 125, and the slider 127 is selectively locked to the forward bevel gear 124 or the reverse bevel gear 125 via a forward clutch 128 or a reverse clutch 129, so that the cutting input shaft 89 is connected to the forward and reverse transmission shaft 122 for forward rotation or reverse rotation.

[0038] It has a structure including a forward and reverse switching case 121 as a forward and reverse switching mechanism for driving the supply conveyor 17 forward or backward, and the supply conveyor 17 is connected to the beater shaft 82 via the forward and reverse switching case 121. Therefore, by operating the reverse switching of the forward and reverse switching case 121, the supply conveyor 17 in the feeder house 11 and the like can be reversed, and the clogged straw in the feeder house 11 and the like can be quickly removed.

[0039] The right end of the auger drive shaft 158 is connected to the output shaft 65 of the engine 7 via a tension pulley-shaped auger clutch 156 and an auger drive belt 157. The front end side of the transverse feed auger 160 at the bottom of the grain tank 6 is connected to the left end of the auger drive shaft 158 via a bevel gear mechanism 159. The vertical feed auger 162 of the grain discharge conveyor 8 is connected to the rear end side of the transverse feed auger 160 via a bevel gear mechanism 161, and the grain discharge auger 164 of the grain discharge conveyor 8 is connected to the upper end side of the vertical feed auger 162 via a bevel gear mechanism 163. Further, it is provided with a grain discharge lever 155 for engaging and disengaging the auger clutch 156. The grain discharge lever 155 is attached in front of the grain tank 6 behind the driver's seat 42, and the operator can operate the grain discharge lever 155 from the driver's seat 42 side.

[0040] Next, with reference to FIGS. 4 and 7, etc., the power transmission structure of the mission case 63 and the like will be described. As shown in FIGS. 4 and 7, etc., a hydraulic continuously variable transmission 64 for straight travel (main travel shift) having a pair of straight travel pumps 64a and straight travel motors 64b, and a hydraulic continuously variable transmission 70 for turning having a pair of turning pumps 70a and turning motors 70b are provided in the mission case 63. The mission input shaft 66 of the mission case 63 is gear-connected to the pump shafts 258 and 259 of the straight travel pump 64a and the turning pump 70a, respectively, so as to be driven. An engine output belt 67 is wound around the mission input pulley 69 on the mission input shaft 66. The output of the engine 7 is transmitted to the mission input pulley 69 via the engine output belt 67, and the straight travel pump 64a and the turning pump 70a are driven.

[0041] The driving force output from the output shaft 65 of the engine 7 is transmitted to the pump shaft 258 of the straight travel pump 64a and the pump shaft 259 of the turning pump 70a via the engine output belt 67 and the mission input shaft 66, respectively. In the straight travel hydraulic continuously variable transmission 64, hydraulic oil is appropriately fed from the straight travel pump 64a toward the straight travel motor 64b by the power transmitted to the pump shaft 258. Similarly, in the turning hydraulic continuously variable transmission 70, hydraulic oil is appropriately fed from the turning pump 70a toward the turning motor 70b by the power transmitted to the pump shaft 259.

[0042] Note that a transmission charge pump 151 for supplying hydraulic oil to the hydraulic pumps 64a and 70a and the hydraulic motors 64b and 70b is attached to the pump shaft 259. The straight travel hydraulic continuously variable transmission 64 changes the inclination angle of the swash plate in the straight travel pump 64a according to the operation amount of the main shift lever 44 arranged on the steering column 41 and the steering handle 43, and changes the discharge direction and discharge amount of the hydraulic oil to the straight travel motor 64b, thereby arbitrarily adjusting the rotation direction and rotation speed of the straight travel motor shaft 260 protruding from the straight travel motor 64b.

[0043] The rotational power of the straight-ahead motor shaft 260 is transmitted from the straight-ahead transmission gear mechanism 250 to the auxiliary transmission gear mechanism 251. The auxiliary transmission gear mechanism 251 has an auxiliary transmission low-speed gear 254, an auxiliary transmission medium-speed gear 255, and an auxiliary transmission high-speed gear 256 that are switched by the auxiliary transmission shifters 252 and 253. By operating the auxiliary transmission lever 45 arranged on the steering column 41, the output rotational speed of the straight-ahead motor shaft 260 is configured to be selectively switched to three speed levels: low speed, medium speed, or high speed. Note that between the low speed, medium speed, and high speed of the auxiliary transmission, there is a neutral position (a position where the output of the auxiliary transmission becomes zero).

[0044] A drum-type parking brake 266 is provided on the parking brake shaft 265 (auxiliary transmission output shaft) provided on the output side of the auxiliary transmission gear mechanism 251. The rotational power from the auxiliary transmission gear mechanism 251 is transmitted from the auxiliary transmission output gear 267 fixed to the parking brake shaft 265 to the left and right differential mechanisms 257. The left and right differential mechanisms 257 each include a planetary gear mechanism 268. Further, a straight-ahead pulse generating rotating body 292 is provided on the parking brake shaft 265, and is configured to detect the rotational speed of the straight-ahead output (straight-ahead vehicle speed = transmission output of the auxiliary transmission output gear 267) by a straight-ahead vehicle speed sensor (not shown).

[0045] Each of the left and right planetary gear mechanisms 268 includes a sun gear 271, a plurality of planetary gears 272 meshing with the sun gear 271, a ring gear 273 meshing with the planetary gears 272, and a carrier 274 that rotatably arranges the plurality of planetary gears 272 on the same circumference. The carriers 274 of the left and right planetary gear mechanisms 268 are arranged opposite to each other with an appropriate interval on the same axis. A center gear 276 is fixed to the sun gear shaft 275 provided with the left and right sun gears 271.

[0046] Each of the left and right ring gears 273 is concentrically arranged on the sun gear shaft 275 with the internal teeth on its inner peripheral surface meshed with a plurality of planet gears 272. Further, the external teeth on the outer peripheral surfaces of the left and right ring gears 273 are connected to the steering output shaft 285 via intermediate gears 287 and 288 for left and right turning output which will be described later. Each ring gear 273 is rotatably supported by left and right forced differential output shafts 277 which project outward from the outer side surface of the carrier 274. Left and right axles 278 are connected to the left and right forced differential output shafts 277 via final gears 278a and 278b. Left and right drive sprockets 51 are attached to the left and right axles 278. Therefore, the rotational power transmitted from the sub-speed gear mechanism 251 to the left and right planetary gear mechanisms 268 is transmitted from the left and right axles 278 to the respective drive sprockets 51 at the same rotational speed in the same direction, driving the left and right crawler belts 2 at the same rotational speed in the same direction to move the traveling body 1 straight ahead (forward and backward).

[0047] The swing hydraulic continuously variable transmission 70 is configured to arbitrarily adjust the rotational direction and rotational speed of the swing motor shaft 261 protruding from the swing motor 70b by changing and adjusting the inclination angle of the swash plate in the swing pump 70a according to the rotation operation amount of the main speed lever 44 arranged on the steering column 41 and the steering handle 43. Further, a swing pulse generating rotating wheel body 294 is provided on a steering counter shaft 280 which will be described later, and the rotational speed (swing vehicle speed) of the steering output of the swing motor 70b is detected by a swing rotation sensor (swing vehicle speed sensor) not shown.

[0048] In addition, inside the mission case 63, there are provided a wet multi-plate type turning brake 279 (steering brake) provided on the turning motor shaft 261 (steering input shaft), a steering countershaft 280 connected to the turning motor shaft 261 via a reduction gear 281, a steering output shaft 285 connected to the steering countershaft 280 via a reduction gear 286, a left input gear mechanism 282 connecting the steering output shaft 285 to the left ring gear 273 via a reverse gear 284, and a right input gear mechanism 283 connecting the steering output shaft 285 to the right ring gear 273. The rotational power of the turning motor shaft 261 is transmitted to the steering countershaft 280. The rotational power transmitted to the steering countershaft 280 is transmitted to the left ring gear 273 as reverse rotational power via the left intermediate gear 287 on the steering output shaft 285 and the reverse gear 284 in the left input gear mechanism 282, while it is transmitted to the right ring gear 273 as forward rotational power via the right intermediate gear 288 on the steering output shaft 285 in the right input gear mechanism 283.

[0049] When the sub-shift gear mechanism 251 is set to neutral, the power transmission from the straight travel motor 64b to the left and right planetary gear mechanisms 268 is blocked. When sub-shifting to an output other than neutral from the sub-shift gear mechanism 251, power is transmitted from the straight travel motor 64b to the left and right planetary gear mechanisms 268 via the sub-shift low-speed gear 254 or the sub-shift medium-speed gear 255 or the sub-shift high-speed gear 256. On the other hand, when the output of the turning pump 70a is in the neutral state and the turning brake 279 is engaged, the power transmission from the turning motor 70b to the left and right planetary gear mechanisms 268 is blocked. When the output of the turning pump 70a is in a state other than neutral and the turning brake 279 is disengaged, the rotational power of the turning motor 70b is transmitted to the left ring gear 273 via the left input gear mechanism 282 and the reverse gear 284, while it is transmitted to the right ring gear 273 via the right input gear mechanism 283.

[0050] As a result, when the turning motor 70b rotates forward (backward), the left ring gear 273 rotates reversely (forward) and the right ring gear 273 rotates forward (reversely) at the same rotational speed in opposite directions. That is, the speed change outputs from the respective motor shafts 260, 261 are transmitted to the drive sprockets 51 of the left and right crawler belts 2 via the auxiliary speed change gear mechanism 251 or the differential mechanism 257 respectively, and the vehicle speed (travel speed) and the traveling direction of the traveling body 1 are determined.

[0051] That is, when the straight - ahead motor 64b is driven with the turning motor 70b stopped and the left and right ring gears 273 stationary and fixed, the rotational output from the straight - ahead motor shaft 260 is transmitted to the left and right sun gears 271 at the same rotational speed. Then, via the planetary gear 272 and the carrier 274, the left and right crawler belts 2 are driven at the same rotational speed in the same direction, and the traveling body 1 travels straight ahead.

[0052] Conversely, when the turning motor 70b is driven with the straight - ahead motor 64b stopped and the left and right sun gears 271 stationary and fixed, the left ring gear 273 rotates forward (backward) and the right ring gear 273 rotates backward (forward) by the rotational power from the turning motor shaft 261. As a result, of the drive sprockets 51 of the left and right crawler belts 2, one rotates forward and the other rotates backward, and the traveling body 1 turns in place (performs a zero - radius turn or spin turn).

[0053] Also, by driving the left and right sun gears 271 with the straight - ahead motor 64b and driving the left and right ring gears 273 with the turning motor 70b, a difference in speed occurs between the left and right crawler belts 2, and the traveling body 1 turns left or right with a turning radius larger than the zero - radius turning radius while moving forward or backward (performs a U - turn). The turning radius at this time is determined according to the speed difference between the left and right crawler belts 2. The traveling drive force of the engine 7 is constantly transmitted to the left and right crawler belts 2 while turning left or right.

[0054] Next, with reference to FIGS. 9 to 16, the working hydraulic circuit 180 and the traveling hydraulic circuit 200 in the ordinary combine of this embodiment will be described. As shown in FIGS. 9 to 14, the working hydraulic circuit 180 includes, as hydraulic actuators, a hydraulic cylinder 4 for mowing elevation, left and right reel elevation hydraulic cylinders 27L and 27R that support the raking reel 14 so as to be elevable, an auger elevation hydraulic cylinder 55 that supports the grain discharge auger 164 so as to be elevable, left and right body elevation hydraulic cylinders 56L and 56R that raise and lower the traveling body 1, a hydraulic oil tank 57 that stores hydraulic oil, a hydraulic pump 59 connected to the hydraulic oil tank 57 via an oil filter 58, and hydraulic valves 60A to 60E for switching the flow of hydraulic oil. The hydraulic valves 60A to 60E are incorporated in a hydraulic valve unit 60 mounted on the traveling body 1.

[0055] The hydraulic pump 59 is hydraulically connected to the mowing elevation hydraulic cylinder 4 via the mowing elevation hydraulic valve 60A. By operating the mowing attitude lever (not shown) in the operation control unit (operator's cab) 5 to tilt it in the front-rear direction, the mowing elevation hydraulic cylinder 4 is operated so that the operator can raise and lower the mowing unit 3 to an arbitrary height (for example, the mowing operation height or the non-operation height, etc.). On the other hand, the working hydraulic pump 59 is hydraulically connected to the reel elevation hydraulic cylinders 27L and 27R via the reel elevation hydraulic valve 60B. By operating the mowing attitude lever (not shown) to tilt it in the left-right direction or the like, the reel elevation hydraulic cylinders 27L and 27R are operated so that the operator can raise and lower the raking reel 14 to an arbitrary height to mow the uncut cereal straws in the field.

[0056] Hydraulically connect the working hydraulic pump 59 to the auger lifting hydraulic cylinder 55 via the auger lifting hydraulic valve 60C. By operating the grain discharge lever 155 in the operation control unit (operator's cab) 5 to tilt it back and forth, the auger lifting hydraulic cylinder 55 is actuated, and the operator can raise and lower the grain throwing opening of the grain discharge auger 164 in the grain discharge conveyor 8 to any height. Note that the grain discharge auger 164 is rotated horizontally by the electric motor 165 together with the vertical feed auger 162 and the bevel gear mechanism 163 to move the grain throwing opening laterally. That is, it is configured to position the grain throwing opening above the truck bed or the container and discharge the grains in the grain tank 6 into the truck bed or the container.

[0057] Hydraulically connect the hydraulic oil tank 57 and the working hydraulic pump 59 to the left body lifting hydraulic cylinder 56L via the left body lifting hydraulic valve 60D. On the other hand, hydraulically connect the hydraulic oil tank 57 and the working hydraulic pump 59 to the right body lifting hydraulic cylinder 56R via the right body lifting hydraulic valve 60E. The left and right body lifting hydraulic cylinders 56L, 56R are operated independently of each other to independently raise and lower the left and right sides of the traveling body 1.

[0058] Therefore, when the left and right body lifting hydraulic cylinders 56L, 56R on both sides are simultaneously actuated to simultaneously lower the left and right truck frames 50, 50 with respect to the traveling body 1, the traveling body 1 moves away upward (rises) from the ground contact portions of the left and right crawler belts 2, 2, and the relative height (vehicle height) of the traveling body 1 with respect to the ground contact portions of the crawler belts 2, 2 increases. Conversely, when the left and right truck frames 50, 50 are simultaneously raised with respect to the traveling body 1, the traveling body 1 approaches (descends) the ground contact portions of the left and right crawler belts 2, 2, and the relative height (vehicle height) of the traveling body 1 with respect to the ground contact portions of the crawler belts 2, 2 decreases.

[0059] When the left body lifting hydraulic cylinder 56L is actuated to lower the left track frame 50 relative to the traveling body 1, or when the right body lifting hydraulic cylinder 56R is actuated to raise the right track frame 50 relative to the traveling body 1 (or even when both of these operations are performed simultaneously), the traveling body 1 inclines downward to the right. Conversely, when the right body lifting hydraulic cylinder 56R is actuated to lower the right track frame 50 relative to the traveling body 1, or when the left body lifting hydraulic cylinder 56L is actuated to raise the right track frame 50 relative to the traveling body 1 (or even when both of these operations are performed simultaneously), the traveling body 1 inclines downward to the left.

[0060] The hydraulic oil tank 57, the hydraulic pump 59, and the hydraulic valve unit 60 are respectively mounted on the traveling body 1 and are connected to each other via hydraulic pipes 181 - 183. On the traveling body 1, the hydraulic oil tank 57 is installed on the front left side, while the hydraulic pump 59 is fixed to the front of the engine 7 mounted on the front right side, and the oil filter 58 installed inside the hydraulic oil tank 57 and the hydraulic pump 59 are connected by the hydraulic pipe 181. Also, on the traveling body 1, the hydraulic valve unit 60 is arranged at a position behind the engine 7, and the discharge side of the hydraulic pump 59 is connected to the hydraulic valve unit 60 via the hydraulic pipe 182. Further, the hydraulic valve unit 60 is connected to the hydraulic oil tank 57 via the hydraulic pipe 183 which serves as the hydraulic oil return pipe.

[0061] The hydraulic oil tank 57 is installed at a spatial position on the traveling body 1 surrounded by the feeder house 11 and the beater 18, and the engine 7 and the hydraulic oil tank 57 are arranged side by side horizontally in front of the traveling body 1. That is, the hydraulic oil tank 57 is arranged in the space surrounded by the feeder house 11 and the machine housing of the threshing unit 9, which can suppress the deposition of dust from the cutting unit 3 on the hydraulic oil tank 57 and prevent the contamination of the hydraulic oil due to the intrusion of dust from the fuel filler port 184 and the like. Also, since the cooling air from the engine 7 flows into the installation space of the hydraulic oil tank 57, it is possible to suppress the rise in the temperature of the hydraulic oil without providing an oil cooler on the working system hydraulic circuit 180, and each hydraulic member can be properly driven.

[0062] The hydraulic oil tank 57 has an oil filler port 184 protruding toward the left side (outside the machine) on its left side surface (outside side surface of the machine), and is internally equipped with an oil filter 58 that can be inserted and removed from the left side. Therefore, by removing the threshing cover 185 provided on the left side (outside the machine) of the threshing unit 9, it is possible to easily access the oil filler port 184 and the oil filter 58. As a result, the refueling operation of the hydraulic oil tank 57 and the replacement operation of the oil filter 58 are facilitated, and the maintainability of the working system hydraulic circuit 180 can be improved.

[0063] Also, the hydraulic pipes 181, 183 connected to the hydraulic oil tank 57 extend horizontally to the left and right in front of the hydraulic oil tank 57 and the engine 7 and are piped. The hydraulic pipe 182 communicates the hydraulic pump 59 arranged in front of the engine 7 and the oil filter 58. That is, the hydraulic pipes 181, 183 bypass in front of the engine 7 and extend along the output shaft 65 of the engine 7 toward the hydraulic oil tank 57. Also, the hydraulic pipes 182, 183 extend rearward through below the cooling fan provided on the right side of the engine 7 and are connected to the hydraulic valve unit 60. Therefore, the hydraulic pipes 181 to 183 are arranged at positions where they are less affected by the radiant heat from the engine 7 and the pipe length is shortened, and it is possible to suppress the temperature of the hydraulic oil flowing through the hydraulic pipes from rising.

[0064] As shown in FIGS. 14 to 16, the traveling hydraulic circuit 200 includes a straight - travel pump 64a, a straight - travel motor 64b, a turning pump 70a, a turning motor 70b, a transmission charge pump 151, an oil filter 152, and an oil cooler 153. The straight - travel pump 64a and the straight - travel motor 64b in the straight - travel hydraulic continuously variable transmission 64 are connected in a closed loop by a straight - travel closed oil passage 201. On the other hand, the turning pump 70a and the turning motor 70b in the turning hydraulic continuously variable transmission 70 are connected in a closed loop by a turning closed oil passage 202. The rotation power of the engine 7 drives the straight - travel pump 64a and the turning pump 70a. By controlling the swash - plate angles of the straight - travel pump 64a and the turning pump 70a, the discharge direction and discharge amount of the hydraulic oil to the straight - travel motor 64b and the turning motor 70b are changed, and the straight - travel motor 64b and the turning motor 70b perform forward and reverse operations.

[0065] The traveling hydraulic circuit 200 is provided with a straight - travel valve 203 that switches and operates in response to the manual operation of the main transmission lever 44, and a straight - travel cylinder 204 connected to the transmission charge pump 151 via the straight - travel valve 203. When the straight - travel valve 203 is switched and operated, the straight - travel cylinder 204 operates to change the swash - plate angle of the straight - travel pump 64a, and a straight - travel speed - change operation is executed to continuously change or reverse the rotation speed of the straight - travel motor shaft 260 of the straight - travel motor 64b.

[0066] The traveling hydraulic circuit 200 includes a turning valve 206 that switches and operates in response to the manual operation of the steering wheel 43, and a turning cylinder 207 connected to the transmission charge pump 151 via the turning valve 206. When the turning valve 206 is switched and operated, the turning cylinder 207 operates to change the swash - plate angle of the turning pump 70a, and left - and - right turning operations are executed to continuously change or reverse the rotation speed of the turning motor shaft 261 of the turning motor 70b, so that the traveling machine body 1 changes the traveling direction left and right to turn on the field ground or correct the course.

[0067] The suction side of the transmission charge pump 151 is connected to a strainer 217 inside the transmission case 63 via a hydraulic pipe 208. The discharge side of the transmission charge pump 151 is connected to a charge introduction oil passage 218 via a hydraulic pipe 209, and an oil filter 152 is installed in the middle of the hydraulic pipe 209. A charge branch oil passage 219 connected to both closed oil passages 201 and 202 is connected to the downstream side of the charge introduction oil passage 218. Therefore, while the engine 7 is running, the hydraulic oil from the transmission charge pump 151 constantly replenishes both closed oil passages 201 and 202.

[0068] Also, the charge branch oil passage 219 is connected to the straight travel cylinder 204 via a straight travel valve 203 and is connected to the turning cylinder 207 via a turning valve 206. Furthermore, the charge branch oil passage 219 is connected to the transmission case 63 via a surplus relief valve 220 and a hydraulic pipe 210, and an oil cooler 153 is installed in the middle of the hydraulic pipe 210. Therefore, when the surplus hydraulic oil from the transmission charge pump 151 returns into the transmission case 63 via the surplus relief valve 220, it is cooled by the oil cooler 153.

[0069] Next, the engine room 146 where the engine 7 is installed will be described with reference to FIGS. 8, 13, 14, etc. As shown in FIGS. 8, 13, 14, etc., a pair of left and right engine room support columns 147 are erected on the rear side of the operator's platform 5 on the upper surface of the traveling body 1, and a back plate 148 is stretched between the left and right engine room support columns 147 to cover the rear of the engine room 146 below the driver's seat 42. Also, a box-shaped wind tunnel case 170 is erected on the right engine room support column 147 provided at the right end of the operator's platform 5 in the traveling body 1 via an opening and closing fulcrum shaft 171. A dust removal net is stretched over the opening on the outside of the machine on the right side surface of the wind tunnel case 170, and the presence of the dust removal net prevents the intrusion of straw chips and the like into the inside of the wind tunnel case 170 and thus into the inside of the engine room 146.

[0070] On the upper side of the traveling body 1, a water-cooling radiator 154 is vertically installed inside the wind tunnel case 170, and the radiator 154 faces the cooling fan 149 of the engine 7. And a shroud 150 is installed in a manner that covers the entire ventilation range of the radiator 154, and the cooling fan 149 is arranged in the opening formed in this shroud 150. Also, an oil cooler 153 is installed in the wind tunnel case 170. By the rotation of the cooling fan 149, outside air (cooling air) is taken into the wind tunnel case 170 from the outside opening on the right side surface of the wind tunnel case 170, and the dust-removed cooling air is sent into the engine room 146 from the inside opening on the left side surface of the wind tunnel case 170. Thereby, the oil cooler 153, the radiator 154, the engine 7, etc. are cooled by the cooling air flowing into the engine room 146.

[0071] Next, the configuration around the cutting support frame 36 which is a part of the machine housing 9b of the threshing unit 9 will be described with reference to FIGS. 5, 6, 8, and FIGS. 11 to 14. As shown in FIGS. 5, 6, 8, and FIGS. 11 to 14, etc., the cutting support frame 36 includes left and right cutting support columns (front support frames) 36a erected from above the upper surface of the traveling body 1 at the front positions of the left and right threshing machine housing columns (rear support frames) 34, and upper and lower cutting support frame beams 36b and 36c that connect the left and right threshing machine housing columns 34 and the left and right cutting support columns 36a in the front and rear directions. The cutting support frame beams 36b and 36c are installed at the upper ends and intermediate portions of the cutting support columns 36a and the threshing machine housing columns 34 arranged in the front and rear directions, respectively.

[0072] Both ends of the left and right beater shaft receivers 38 are connected to the middle parts of the left and right upper and lower cutting support frame beams 36b and 36c provided on the left and right, and the beater 18 is pivotally supported in the cutting support frame body 36 by the left and right beater shaft receivers 38. On the cutting support frame body 36, there are provided side plates 186 covering the left and right sides of the beater 18, a top plate 187 covering the upper part of the beater 18, a front plate 188 covering the front of the beater 18, and a bottom plate 189 covering the lower part of the beater 18. That is, a closed space that communicates the rear end of the feeder house 11 and the handling port 9a is formed above the lower beam frame 36c in the cutting support frame body 36. And a beater 18 is installed in the closed space to smoothly guide the grain straw from the supply conveyor 17 to the handling port 9a.

[0073] The side plate 186 is installed so as to seal the area surrounded by the columns 34, 36a and the beam frames 36b, 36c, and has a hole for penetrating the beater shaft 82 pivotally supported by the beater shaft receiver 38 arranged outside the side plate 186. The top plate 187 is installed on the left and right beam frames 36b, and the handling cylinder drive case 71 is installed on its upper surface. The front plate 188 has its front edge and upper edge connected and extends downward toward the upper part of the feeder house 11. The front edge of the bottom plate 189 is connected to the rear edge of the bottom plate 190 of the feeder house 11, and the rear edge of the bottom plate 189 is connected to the front edge of the bottom surface of the handling port 9a in front of the handling cylinder 21. The bottom plate 189 acts as a guide plate for the grain straw from the feeder house 11 to the handling port 9a.

[0074] An operating oil tank 57 is installed in the space below the beater 18 installation space of the cutting support frame body 36, and the upper part of the operating oil tank 57 is covered by the bottom plate 189. Also, the front of the operating oil tank 57 is covered by a front cover plate 191 connected to the bottom plate 189. A winnowing fan-shaped winnowing basket 29 is provided behind the operating oil tank 57, and the outer periphery of the winnowing basket 29 is covered by a winnowing basket cover plate 192. Therefore, in the cutting support frame body 36, the operating oil tank 57 is installed in the space surrounded by the bottom plate 189, the front cover plate 191, and the winnowing basket cover plate 192.

[0075] The installation space of the hydraulic oil tank 57 formed by the bottom plate 189, the front cover plate 191, and the winnowing cover plate 192 constitutes a passage that is open on both the left and right sides and communicates with the engine room 146 on the right side. Further, the machine housing 9b of the threshing unit 9 is provided with left and right threshing side plates 193, and the front edge of the right threshing side plate 193 is fixed to the right threshing machine housing support column 34 that is located in front of the engine room support column 147. Therefore, a part of the cooling air taken in from the outside air by the cooling fan 149 passes through the engine room 146 and flows into the installation space of the hydraulic oil tank 57 in the cutting support frame 36 to cool the hydraulic oil tank 57.

[0076] Also, a part of the cooling air passing through the engine room 146 flows into the air passage formed by the winnowing cover plate 192 behind the installation space of the hydraulic oil tank 57 due to the rotation of the winnowing fan 29. As a result, an air flow that flows in the front-rear direction is formed in the space between the engine room 146 and the threshing unit 9, and due to being induced by this front-rear air flow, outside air also flows in from the front of the traveling machine body 1. The outside air flows into the installation space of the hydraulic oil tank 57 from the front of the traveling machine body 1 and cools the hydraulic oil tank 57 together with a part of the cooling air from the engine room 146. That is, by actively flowing the exhaust air from the engine 7 toward the winnowing fan 29 side, outside air flows into the installation space of the hydraulic oil tank 57 together with a part of the cooling air of the engine 7, enhancing the cooling effect of the hydraulic oil tank 57.

[0077] As described above, by adopting a configuration in which the cooling air from the engine room 146 passes through the hydraulic oil tank 57, it is possible to suppress an increase in the temperature of the working oil circulating in the working system hydraulic circuit 180 including the hydraulic oil tank 57. Therefore, not only is it unnecessary to provide an oil cooler in the working system hydraulic circuit 180, but by making the working system hydraulic circuit 180 and the traveling system hydraulic circuit 200 separate systems, a configuration can be adopted in which only the traveling system hydraulic circuit 200 is provided with the oil cooler 153. As a result, the capacity of the oil cooler 153 can be reduced, and the cooling efficiency of the radiator 154 and the engine 7 located downstream of the oil cooler 153 in the cooling air flow can be enhanced.

[0078] Also, a sub-countershaft 104 that receives driving force from the engine 7 is pivotally supported by the threshing machine housing support column (rear support frame) 34, and the beater shaft 82 of the beater 18 is pivotally supported by a beater shaft receiver 38 that is connected to the upper and lower cutting support frame beams 36b and 36c. A cutting input shaft 89 pivotally supported at a position forward of the cutting support column (front support frame) 36a penetrates the feeder house 11. A first power transmission mechanism (a beater drive mechanism including drive pulleys 107 and 108 and a cutting drive belt 114) that transmits the rotational power of the sub-countershaft 104 to the beater shaft 82, and a second power transmission mechanism (a cutting drive mechanism including a cutting drive chain 115 and sprockets 116 and 117) that transmits the rotational power of the beater shaft 82 to the cutting input shaft 89 are provided. And an oil filling port 184 of the hydraulic oil tank 57 and an oil filter 58 are arranged in a region surrounded by the first and second power transmission mechanisms and the front cutting support column 36a. Thereby, the oil filling operation for the hydraulic oil tank 57 and the replacement operation of the oil filter 58 can be performed without removing the transmission members (chain or belt) in the first and second power transmission mechanisms, so that the maintainability of the working system hydraulic circuit 180 can be improved.

[0079] Furthermore, the threshing section 9 pivotally supports a straw winnower 29 on the rear side of the threshing machine housing support column (rear support frame) 34, and a main countershaft 76 that is relatively rotatable with respect to the straw winnower shaft 100 of the straw winnower 29 penetrates inside the straw winnower shaft 100. And the main countershaft 76 receives power from the engine 7 and transmits the power to the sub-countershaft 104, and the rotational power of the sub-countershaft 104 branches and is transmitted to the straw winnower shaft 100 and the beater shaft 82 respectively. By concentrating the drive systems for driving the cutting section 3, the grain sorting mechanism 10, and the straw winnower 29 on the left side (outside the machine) of the threshing section 9, the front right side (inside the machine) of the threshing section 9 can be opened. Therefore, the right side of the installation space of the hydraulic oil tank 57 at the front lower side of the threshing section 9 can be opened, and a lot of cooling air can be induced into the installation space of the hydraulic oil tank 57.

Description of Reference Numerals

[0080] 1 Traveling body 3 Cutting section 5 Operator's cab 7 Engine 9 Threshing section 9a Inlet 9b Machine housing 11 Feeder house 17 Supply conveyor 18 Beater 21 Cylinder 29 Straw rack 34 Threshing machine housing support 35 Reaping support frame 36a Support pillar for reaping support frame 36b Beam frame for reaping support frame 36c Beam frame for reaping support frame 37 Reaping shaft receiver 38 Beater shaft receiver 57 Hydraulic oil tank 58 Oil filter 59 Hydraulic pump 63 Transmission case 76 Straw rack shaft (constant rotation shaft) 82 Beater shaft (front rotor shaft) 89 Reaping input shaft 184 Oil filling port 185 Threshing cover 186 Side plate 187 Top plate 188 Front plate 189 Bottom plate 190 Bottom plate (feeder house) 191 Front cover plate 192 Straw rack cover plate 193 Threshing side plate

Claims

1. A combine harvester comprising a threshing unit having a threshing cylinder and an engine mounted on a traveling machine body, wherein a cutting unit is provided at the front of the threshing unit, and the cut crop straws conveyed from the cutting unit are fed into the threshing unit. The engine is disposed on one side in the machine width direction of the traveling machine body, and a hydraulic oil tank is disposed on the other side in the machine width direction of the traveling machine body. A hydraulic valve unit for switching the flow of hydraulic oil is provided on the traveling machine body, and the hydraulic valve unit is connected to the hydraulic oil tank by a hydraulic pipe. A radiator and a cooling fan for blowing air toward the other side in the machine width direction are provided on one side in the machine width direction of the engine. The combine harvester is characterized in that the hydraulic valve unit is disposed behind the engine.

2. The combine harvester according to claim 1, wherein the engine and the hydraulic oil tank are arranged side by side in the left-right direction so that they overlap each other in a side view of the traveling machine body.

3. The combine harvester according to claim 1 or 2, wherein the hydraulic oil tank is disposed in front of the threshing unit.

4. The combine harvester according to any one of claims 1 to 3, wherein the hydraulic pipe extends rearward passing below the cooling fan and is connected to the hydraulic valve unit.

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