Combine

Abstract

To provide a combine which can facilitate a fuel supply work of a hydraulic oil tank and a replacement work of an oil filter.SOLUTION: A combine includes a vehicle body having a thresher part with a threshing cylinder and an engine. A reaping part is provided on a front part of the thresher, a reaped grain culm conveyed from the reaping part is input into the thresher. A hydraulic oil tank is provided on one side in a machine body width direction of the vehicle body, and the engine is provided on the other side in the machine body width direction of the vehicle body. The hydraulic oil tank includes an oil inlet projecting toward a machine outer side, and an oil filter installed therein. The oil filter is provided in the hydraulic oil tank to the machine outer side.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to a combine harvester equipped with a reaping unit that reaps unharvested stalks in a field and a threshing unit that threshes grains from the reaped stalks. [Background technology]

[0002] Conventionally, in a conventional combine harvester equipped with a feeder house that transports stalks harvested in the harvesting section to the threshing drum, there is a technology that improves the intake of harvested stalks into the threshing drum by providing a beater for feeding stalks in the harvesting section between the end of the feeder house and the entrance of the threshing drum (see Patent Document 1). Also, in a head-feeding combine harvester equipped with a feed chain that transports stalks harvested in the harvesting section to the threshing drum, there has been proposed a system in which hydraulic oil supplied to the continuously variable transmission for traveling is stored in a hydraulic oil tank (see Patent Documents 2 and 3). Furthermore, in a conventional combine harvester, there is a technology in which hydraulic pumps and hydraulic motors are provided in the left and right traveling sections to drive the left and right traveling sections (see Patent Document 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-037126 [Patent Document 2] Japanese Patent Application Laid-Open No. 2004-058824 [Patent Document 3] Japanese Patent Application Laid-Open No. 2015-084709 [Patent Document 4] Japanese Patent Application Laid-Open No. 2010-239980 Summary of the Invention [Problem to be solved by the invention]

[0004] The prior art disclosed in Patent Documents 1 to 4 describes a combine harvester in which a hydraulic oil tank is disposed on the traveling body.

[0005] The present invention aims to provide a combine harvester that can easily fill the hydraulic oil tank and replace the oil filter. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the combine of the present invention is a combine harvester that has a running body that mounts a threshing section equipped with a threshing drum and an engine, a cutting section is provided in front of the threshing section, and the harvested straw transported from the cutting section is fed into the threshing section, and a hydraulic oil tank is arranged on one side of the running body in the body width direction, and the engine is arranged on the other side of the running body in the body width direction, and the hydraulic oil tank has an oil filler port that protrudes toward the outside of the machine and has an oil filter built in, and the oil filter is arranged on the outside of the machine within the hydraulic oil tank. [Effects of the Invention]

[0007] According to the present invention, the work of filling the hydraulic oil tank and the work of replacing the oil filter can be facilitated. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a left side view of a combine harvester showing a first embodiment of the present invention. FIG. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] This is a drive system diagram of a combine harvester. [Figure 5] This is a perspective view of the combine harvester as seen diagonally from the front. [Figure 6] A partial plan cross-sectional view of the threshing section. [Figure 7] FIG. 2 is a drive system diagram of the transmission case. [Figure 8] A front view showing the configuration of the engine room and threshing section. [Figure 9] FIG. 2 is a hydraulic circuit diagram showing the configuration of a working hydraulic circuit. [Figure 10]FIG. 2 is a perspective view showing the configuration of a working hydraulic circuit. [Figure 11] This is an oblique view of the threshing section seen from diagonally front. [Figure 12] An enlarged view of the left side of the threshing section. [Figure 13] This is a plan cross-sectional view showing the configuration of the engine room and threshing section. [Figure 14] FIG. 2 is a front view showing the arrangement of hydraulic circuit components. [Figure 15] FIG. 2 is a hydraulic circuit diagram showing the configuration of a traveling hydraulic circuit. [Figure 16] FIG. 2 is a plan view showing the piping configuration of a hydraulic circuit. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of the present invention will be described below with reference to the drawings (Figs. 1 to 10) in which the present invention is applied to a full-type combine harvester. Fig. 1 is a left side view of the combine harvester, Fig. 2 is a right side view of the same, and Fig. 3 is a plan view of the same. First, the general structure of the combine harvester will be described with reference to Figs. 1 to 3. In the following description, the left side as viewed in the forward direction of the traveling body 1 will be simply referred to as the left side, and the right side as viewed in the forward direction will be simply referred to as the right side.

[0010] As shown in Figures 1 to 3, the conventional combine harvester in this embodiment has a traveling body 1 supported by a pair of left and right rubber crawler tracks 2 as a traveling part. A reaping unit 3 that harvests and collects unharvested stalks of rice (or wheat, soybeans, or corn) or the like is attached to the front of the traveling body 1 so that it can be raised and lowered by a single-acting lifting hydraulic cylinder 4.

[0011] A threshing section 9 is mounted on the left side of the traveling body 1 for threshing the harvested stalks supplied from the reaping section 3. A grain sorting mechanism 10 for performing shaking sorting and wind sorting is located below the threshing section 9. A cab 5 for an operator is mounted on the front right side of the traveling body 1. An engine 7 serving as a power source is located in the cab 5 (below the driver's seat 42). Behind the cab 5 (to the right of the traveling body 1) are located a grain tank 6 that removes grain from the threshing section 9, and a grain discharge conveyor 8 that discharges the grain in the grain tank 6 toward the truck bed (or a container, etc.). The grain discharge conveyor 8 is configured to be tilted outward from the machine so that the grain in the grain tank 6 can be transported by the grain discharge conveyor 8.

[0012] The reaping section 3 comprises a feeder house 11 connected to the handling port 9a at the front of the threshing section 9, and a horizontally long bucket-shaped grain header 12 connected to the front end of the feeder house 11. A raking auger 13 (platform auger) is rotatably supported within the grain header 12. A tine bar-equipped raking reel 14 is arranged above the front of the raking auger 13. A clipper-shaped cutting blade 15 is arranged at the front of the grain header 12. Left and right grass dividing bodies 16 protrude from both the left and right sides of the front of the grain header 12. A supply conveyor 17 is also installed inside the feeder house 11. A beater 18 (front rotor) for feeding harvested stalks is provided at the feeding end of the supply conveyor 17 (handling port 9a). The underside of the feeder house 11 and the front end of the running body 1 are connected via a lifting hydraulic cylinder 4, and the cutting unit 3 is raised and lowered by the cutting lifting hydraulic cylinder 4, with the cutting input shaft 89 (feeder house conveyor shaft) described later as the lifting fulcrum.

[0013] With the above configuration, the tips of the uncut stalks between the left and right grass segments 16 are raked in by the raking reel 14, and the bases of the uncut stalks are cut by the cutting blade 15. The rotation of the raking auger 13 collects the cut stalks near the entrance to the feeder house 11, near the center of the width of the grain header 12. The entire amount of cut stalks in the grain header 12 is transported by the supply conveyor 17 and fed into the threshing opening 9a of the threshing section 9 by the beater 18. A horizontal control hydraulic cylinder (not shown) can be provided to rotate the grain header 12 around a horizontal control fulcrum axis. The horizontal tilt of the grain header 12 can be adjusted with the horizontal control hydraulic cylinder to support the grain header 12, cutting blade 15, and raking reel 14 horizontally relative to the field surface.

[0014] 1 and 3, a threshing drum 21 is rotatably mounted within the threshing chamber of the threshing section 9. The threshing drum 21 is supported by a threshing drum shaft 20 (see FIG. 4) that extends in the front-to-rear direction of the traveling body 1. A receiving net 24 is stretched below the threshing drum 21 to allow grain to drip through. In addition, a spiral screw-shaped intake blade 25 is provided on the outer peripheral surface of the front part of the threshing drum 21, protruding radially outward.

[0015] With the above configuration, the harvested stalks fed into the threshing opening 9a by the beater 18 are transported toward the rear of the traveling body 1 by the rotation of the threshing drum 21, and are kneaded and threshed between the threshing drum 21 and the receiving net 24. Grains that are smaller than the mesh size of the receiving net 24 leak through the receiving net 24. Straw chips that do not leak through the receiving net 24 are discharged into the field through the dust outlet 23 at the rear of the threshing section 9 by the transporting action of the threshing drum 21.

[0016] In addition, a number of dust transfer valves (not shown) that adjust the transport speed of the threshing grain in the threshing chamber are pivotally mounted above the threshing drum 21. By adjusting the angle of the dust transfer valves, the transport speed (retention time) of the threshing grain in the threshing chamber can be adjusted according to the variety and properties of the harvested stalks. Meanwhile, the grain sorting mechanism 10, located below the threshing section 9, is equipped with a oscillating sorting board 26 for gravity sorting that has a grain pan, chaff sieve, grain sieve, straw rack, etc.

[0017] The grain sorting mechanism 10 also includes a fan-shaped winnower 29 that supplies sorting air to the oscillating sorting plate 26. The threshed grains that have been threshed by the threshing drum 21 and that have fallen through the receiving net 24 are sorted by the gravity sorting action of the oscillating sorting plate 26 and the wind sorting action of the fan-shaped winnower 29 into grains (first-grade grains such as refined grains), a mixture of grains and straw (second-grade grains such as grains with stalks), and straw chips, and are removed.

[0018] Below the oscillating sorting board 26, a first conveyor mechanism 30 and a second conveyor mechanism 31 are provided as the grain sorting mechanism 10. After sorting by the oscillating sorting board 26 and the fan-like winnower 29, the grains (first grains) that fall from the oscillating sorting board 26 are collected in the grain tank 6 by the first conveyor mechanism 30 and the grain lifting conveyor 32. The mixture of grains and straw (second grains) is returned to the sorting start end of the oscillating sorting board 26 via the second conveyor mechanism 31 and the second return conveyor 33, etc., and is sorted again by the oscillating sorting board 26. Straw chips and the like are configured to be discharged into the field from the dust discharge port 23 at the rear of the traveling body 1.

[0019] 1 to 3, the driver's cab 5 is provided with a steering column 41 and a driver's seat 42 on which the operator sits. The steering column 41 is provided with an accelerator lever 40 for adjusting the rotation speed of the engine 7, a round steering handle 43 that the operator turns to change the course of the traveling machine body 1, a main speed change lever 44 and a sub speed change lever 45 for changing the traveling speed of the traveling machine body 1, a reaping clutch lever 46 for operating or stopping the reaping unit 3, and a threshing clutch lever 47 for operating or stopping the threshing unit 9. A sunshade roof 49 is attached to the front upper surface of the grain tank 6 via a sun visor support 48, and the sunshade roof 49 covers the upper side of the driver's cab 5.

[0020] 1 and 2, left and right track frames 50 are arranged on the underside of the traveling vehicle body 1. The track frame 50 is provided with a drive sprocket 51 that transmits power from the engine 7 to the crawler belt 2, a tension roller 52 that maintains the tension of the crawler belt 2, a plurality of track rollers 53 that keep the ground-contacting side of the crawler belt 2 in a ground contact state, and an intermediate roller 54 that holds the non-ground contacting side of the crawler belt 2. The drive sprocket 51 supports the front side of the crawler belt 2, the tension roller 52 supports the rear side of the crawler belt 2, the track roller 53 supports the ground-contacting side of the crawler belt 2, and the intermediate roller 54 supports the non-ground contacting side of the crawler belt 2.

[0021] Next, the drive structure of the combine will be described with reference to Figures 4 to 8. As shown in Figures 4 and 7, a linear hydraulic continuously variable transmission 64 for traveling speed change, which has a hydraulic linear pump 64a and a hydraulic linear motor 64b, is provided in a transmission case 63. An engine 7 is mounted on the upper right surface of the front part of the traveling body 1, and the transmission case 63 is located in front of the traveling body 1 to the left of the engine 7. An output shaft 65 protruding leftward from the engine 7 and a 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] In addition, a hydraulic swing continuously variable transmission 70 for steering having a hydraulic swing pump 70a and a hydraulic swing motor 70b is provided in the transmission case 63, and the output of the engine 7 is transmitted to the straight-line hydraulic continuously variable transmission 64 and the swing hydraulic continuously variable transmission 70 via the transmission input shaft 66, while the output of the straight-line hydraulic continuously variable transmission 64 and the swing hydraulic continuously variable transmission 70 is controlled using the steering handle 43, the main shift lever 44, and the sub shift lever 45, and the left and right tracks 2 are driven via the straight-line hydraulic continuously variable transmission 64 and the swing hydraulic continuously variable transmission 70, allowing the vehicle to travel within a field, etc.

[0023] Furthermore, as shown in Figures 4 to 6 and 8, there is provided a threshing drum drive case 71 that supports the front end of the threshing drum shaft 20. The threshing drum drive case 71 is arranged on the front side of the threshing unit 9. A threshing drum input shaft 72 for driving the reaping unit 3 and threshing drum 21 is supported on the threshing drum drive case 71. There is also provided a main counter shaft 76 as a constant rotation shaft that passes through the threshing unit 9 from left to right. A working unit input pulley 83 is provided on 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 a working unit drive belt 85.

[0024] A threshing drum input shaft 72 extending left and right from the traveling body 1 is provided in front of the threshing drum 21, a beater 18 arranged left and right from the traveling body 1, and a reaping input shaft 89 extending left and right from the traveling body 1. A threshing drum input mechanism 90 that transmits the driving force of the main counter shaft 76 to the threshing drum input shaft 72 comprises threshing drum drive pulleys 86, 87 and a threshing drum drive belt 88, and the threshing drum input mechanism 90 (threshing drum drive pulleys 86, 87 and threshing drum drive belt 88) is arranged at one end of the main counter shaft 76 on the engine 7 side to which the driving force from the engine 7 is transmitted, so that the threshing drum 21 is driven to a constant rotation by the constant rotation output of the engine 7.

[0025] A beater drive mechanism and a reaping drive mechanism that transmit the driving force of the main counter shaft 76 to the beater shaft 82 and the reaping input shaft 89 are provided on the other end of the main counter shaft 76. In addition, a sub counter shaft 104 is disposed between the beater shaft 82 and the main counter shaft 76, and 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, thereby constituting a power relay mechanism that transmits power to the reaping drive mechanism.

[0026] A mowing drive belt 114 is wound around mowing drive pulleys 107, 108 provided on the sub counter shaft 104 and the beater shaft 82, respectively, to form a beater drive mechanism. The mowing drive belt 114 is tensioned by a mowing clutch 109, which also serves as a tension roller, so that rotational power from the engine 7 transmitted to the main counter shaft 76 is input to the beater shaft 82 via the power relay mechanism and the beater drive mechanism. The mowing drive mechanism is also configured to transmit mowing drive power from the engine 7 from the beater shaft 82, on which the beater 18 is journaled, to the mowing input shaft 89 via a mowing drive chain 115 and sprockets 116, 117. As a result, the mowing unit 3, together with the beater 18, is driven at a constant rotational speed by the constant rotational output of the engine 7.

[0027] The winnowing shaft 100, which is the rotating shaft of the fan-shaped winnowing machine 29, has a hollow tubular shape, and the main counter shaft 76 is inserted into the hollow portion of the winnowing shaft 100. In other words, the main counter shaft 76 and the winnowing shaft 100 form a double-shaft structure, and the main counter shaft 76 and the winnowing shaft 100 are supported so that they can rotate relative to each other. In addition, a winnowing drive belt 103 is wound around winnowing drive pulleys 101, 102 provided on the sub-counter shaft 104 and the winnowing shaft 100, respectively, to form a winnowing drive mechanism. Therefore, the rotational power from the engine 7 transmitted to the main counter shaft 76 is input to the beater shaft 82 via the power relay mechanism and the winnowing drive mechanism, and the winnowing machine 29 is driven at a constant rotational speed by the constant rotational output of the engine 7.

[0028] Furthermore, the machine housing 9b of the threshing unit 9 has a reaping support frame 36 installed on the upper surface of the traveling body 1, above the front of the threshing machine housing support column 34. A reaping bearing body 37 is attached to the front right side of the reaping support frame 36, and a forward / reverse rotation switch case 121 (described later) is attached to the front left side of the reaping support frame 36. A reaping input shaft 89 is journaled on the front side of the reaping support frame 36 via the reaping bearing body 37 and the forward / reverse rotation switch case 121 so as to be rotatable left and right on the traveling body 1, and a left and right facing beater shaft 82 (beater 18) is journaled inside the reaping support frame 36 so as to be rotatable left and right via a beater bearing body 38. A threshing drum drive case 71 is attached to the top side of the reaping support frame 36, and a threshing drum input shaft 72 is journaled on the threshing drum drive case 71.

[0029] On the other hand, there is provided a reaping input shaft 89 facing left and right that drives the supply conveyor 17 inside the feeder house 11. The reaping driving force transmitted from the engine 7 to one end of the main counter shaft 76 on the engine 7 side is transmitted from the other end of the main counter shaft 76, which is opposite the engine 7, to a forward / reverse transmission shaft 122 of a reaping forward / reverse rotation switching case 121. The reaping input shaft 89 is driven via a forward rotation bevel gear 124 or a reverse rotation bevel gear 125 of the reaping forward / reverse rotation switching case 121.

[0030] A threshing drum input shaft 72 facing left and right is provided in front of the threshing unit 9, and the driving force transmitted from the engine 7 to one end of the main counter shaft 76 on the engine 7 side is transmitted to one end of the threshing drum input shaft 72 on the engine 7 side. The threshing drum input shaft 72 provided in front of the threshing unit 9 is arranged to face left and right relative to the traveling body 1, while the threshing drum 21 is journaled on a threshing drum shaft 20 arranged in the front-rear direction of the traveling body 1. The front end of the threshing drum shaft 20 is connected via a bevel gear mechanism 75 to the other left and right ends of the threshing drum input shaft 72 opposite the engine 7. The driving force of the engine 7 is transmitted from the other left and right ends of the main counter shaft 76 opposite the engine 7 to a grain sorting mechanism 10 that sorts threshed grains or to the reaping unit 3.

[0031] That is, the right end of the threshing drum input shaft 72 is connected to the right end of the main counter shaft 76 closest to the engine 7 via threshing drum drive pulleys 86, 87 and a threshing drum drive belt 88. The front end of the threshing drum shaft 20 is connected to the left end of the threshing drum input shaft 72, which extends 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 counter shaft 76 to the front end of the threshing drum shaft 20 via the threshing drum input shaft 72, driving the threshing drum 21 to rotate in one direction. Meanwhile, the driving force of the engine 7 is transmitted from the left end of the main counter shaft 76 to a grain sorting mechanism 10 located below the threshing unit 9.

[0032] Furthermore, the left end of the main counter shaft 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 a crank-shaped oscillating drive shaft 79, which supports the rear of the oscillating sorting board 26, via an oscillating sorting belt 112. In other words, the threshing clutch 84 is controlled to be engaged and disengaged by the operator's operation of the threshing clutch lever 47. The engagement of the threshing clutch 84 drives each part of the grain sorting mechanism 10 and the threshing drum 21.

[0033] The grain lifting conveyor 32 is driven via the first conveyor shaft 77, and the first sorted grains from the first conveyor mechanism 30 are collected in the grain tank 6. The second return conveyor 33 is driven via the second conveyor shaft 78, and the second sorted grains (second grains) mixed with straw dust from the second conveyor mechanism 31 are returned to the upper surface of the oscillating sorting board 26. In a structure in which a spreader (not shown) for scattering straw dust is provided at the dust discharge port 23, the left end of the main counter shaft 76 is connected to the spreader via a spreader drive pulley (not shown) and a spreader drive belt (not shown).

[0034] A reaping input shaft 89 is provided as a conveyor input shaft that supports the feed end of the supply conveyor 17. A header drive shaft 91 is rotatably supported on the rear side of the right side of the grain header 12. The left end of a forward / reverse rotation transmission shaft 122 is connected to the left end of the beater shaft 82 via a reaping drive chain 115 and sprockets 116, 117, and the reaping input shaft 89 is connected to the forward / reverse rotation transmission shaft 122 via a forward / reverse rotation switch case 121. The right end of the reaping input shaft 89 is connected to the left end of the header drive shaft 91, which extends in the left-right direction, via a header drive chain 118 and sprockets 119, 120. A sweeping shaft 93 is provided that supports the sweeping auger 13. The middle portion of the header drive shaft 91 is connected to the right portion of the sweeping shaft 93 via a sweeping drive chain 92.

[0035] The header drive shaft 91 also includes a reel shaft 94 that supports the raking reel 14. The right end of the reel shaft 94 is connected to the right end of the raking shaft 93 via an intermediate shaft 95 and reel drive chains 96, 97. The right end of the header drive shaft 91 is connected to the cutting blade 15 via a cutting blade drive crank mechanism 98. By turning the cutting clutch 109 on and off, the supply conveyor 17, the raking auger 13, the raking reel 14, and the cutting blade 15 are driven and controlled, so that the tips of the uncut stalks in the field are continuously cut.

[0036] A forward rotation bevel gear 124 formed integrally with the forward / reverse rotation transmission shaft 122, a reverse rotation bevel gear 125 rotatably supported on the reaping input shaft 89, and an intermediate bevel gear 126 connecting the forward rotation bevel gear 124 to the reverse rotation bevel gear 125 are disposed within the forward / reverse rotation switch case 121. The intermediate bevel gear 126 is constantly meshed with the forward rotation bevel gear 124 and the reverse rotation bevel gear 125. Meanwhile, a slider 127 is slidably supported on the reaping input shaft 89 by spline engagement. The slider 127 is configured to be releasably engageable with the forward rotation bevel gear 124 via a forward rotation clutch 128 in the form of a pawl clutch, and is configured to be releasably engageable with the reverse bevel gear 125 via a reverse clutch 129 in the form of a pawl clutch.

[0037] The forward / reverse switching shaft 123 is provided for sliding the slider 127, and a forward / reverse switching arm 130 is provided on the forward / reverse switching shaft 123. The forward / reverse switching arm 130 is swung by operating a forward / reverse switching lever 212 (forward / reverse operating device), thereby rotating the forward / reverse switching shaft 123 and moving the slider 127 toward or away from the forward bevel gear 124 or the reverse bevel gear 125. The slider 127 is selectively engaged with the forward bevel gear 124 or the reverse bevel gear 125 via a forward clutch 128 or a reverse clutch 129, and the mowing input shaft 89 is connected to the forward / reverse transmission shaft 122 in either forward or reverse direction.

[0038] The structure is provided with a forward / reverse switching case 121 as a forward / reverse switching mechanism that drives the supply conveyor 17 in forward or reverse rotation, and the supply conveyor 17 is connected to the beater shaft 82 via the forward / reverse switching case 121. Therefore, by operating the reverse switching operation of the forward / reverse switching case 121, the supply conveyor 17 of the feeder house 11 can be reversed, and straw stuck in the feeder house 11 can be quickly removed.

[0039] The right end of an 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 left end of the auger drive shaft 158 ​​is connected to the front end of a lateral feed auger 160 at the bottom of the grain tank 6 via a bevel gear mechanism 159. A vertical feed auger 162 of the grain discharge conveyor 8 is connected to the rear end of the lateral feed auger 160 via a bevel gear mechanism 161, and a grain discharge auger 164 of the grain discharge conveyor 8 is connected to the upper end of the vertical feed auger 162 via a bevel gear mechanism 163. In addition, a grain discharge lever 155 is provided to turn the auger clutch 156 on and off. The grain discharge lever 155 is attached to the front of the grain tank 6 behind the driver's seat 42 so that the operator can operate the grain discharge lever 155 from the driver's seat 42 side.

[0040] Next, the power transmission structure of the transmission case 63 and the like will be described with reference to Figures 4, 7, etc. As shown in Figures 4, 7, etc., the transmission case 63 is provided with a hydraulic continuously variable transmission 64 for straight driving (main traveling speed change) having a pair of straight pumps 64a and straight motors 64b, and a hydraulic continuously variable transmission 70 for swing having a pair of swing pumps 70a and swing motors 70b. A transmission input shaft 66 of the transmission case 63 is gear-coupled to pump shafts 258, 259 of the straight pump 64a and the swing pump 70a, respectively, for driving them. An engine output belt 67 is wound around a 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 to drive the straight pump 64a and the swing pump 70a.

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

[0042] A transmission charge pump 151 for supplying hydraulic oil to the hydraulic pumps 64a, 70a and the hydraulic motors 64b, 70b is attached to the pump shaft 259. The linear hydraulic continuously variable transmission 64 is configured to arbitrarily adjust the rotation direction and rotation speed of the linear motor shaft 260 protruding from the linear motor 64b by changing and adjusting the inclination angle of the rotating swash plate in the linear pump 64a in accordance with the amount of operation of the main speed change lever 44 or the control handle 43 arranged on the control column 41, thereby changing the discharge direction and discharge amount of hydraulic oil to the linear motor 64b.

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

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

[0045] Each of the left and right planetary gear mechanisms 268 includes a sun gear 271, multiple 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 multiple planetary gears 272 on the same circumference. The carriers 274 of the left and right planetary gear mechanisms 268 are arranged facing each other on the same axis with an appropriate gap between them. A center gear 276 is fixed to a sun gear shaft 275 on which the left and right sun gears 271 are mounted.

[0046] Each of the left and right ring gears 273 is disposed concentrically on the sun gear shaft 275, with the internal teeth on its inner peripheral surface meshing with the multiple planetary gears 272. The external teeth on the outer peripheral surfaces of each of the left and right ring gears 273 are connected to a steering output shaft 285 via intermediate gears 287, 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 that protrude outward to the left and right from the outer 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, 278b. Left and right drive sprockets 51 are attached to the left and right axles 278. Therefore, the rotational power transmitted from the sub-transmission gear mechanism 251 to the left and right planetary gear mechanisms 268 is transmitted from the left and right axles 278 to each drive sprocket 51 at the same rotational speed in the same direction, driving the left and right tracks 2 at the same rotational speed in the same direction, and moving the running body 1 in a straight line (forward and backward).

[0047] The hydraulic swing continuously variable transmission 70 is configured to arbitrarily adjust the rotation direction and rotation 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 in accordance with the rotation amount of the main speed change lever 44 or the steering handle 43 arranged on the steering column 41, thereby changing the discharge direction and discharge amount of hydraulic oil to the swing motor 70b. In addition, a swing pulse generating rotating wheel 294 is provided on the steering counter shaft 280, which will be described later, and is configured to detect the rotation speed (swing vehicle speed) of the steering output of the swing motor 70b using a swing rotation sensor (swing vehicle speed sensor), not shown.

[0048] Also provided within the transmission case 63 are a wet-type multi-plate swing brake 279 (steering brake) provided on the swing motor shaft 261 (steering input shaft), a steering countershaft 280 connected to the swing 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 swing motor shaft 261 is transmitted to the steering countershaft 280. The rotational power transmitted to the steering countershaft 280 is transmitted as reverse rotational power to the left ring gear 273 via the left intermediate gear 287 and the reverse gear 284 on the steering output shaft 285 of the left input gear mechanism 282, and is transmitted as forward rotational power to the right ring gear 273 via the right intermediate gear 288 on the steering output shaft 285 of the right input gear mechanism 283.

[0049] When the auxiliary transmission gear mechanism 251 is in neutral, power transmission from the linear motor 64b to the left and right planetary gear mechanisms 268 is blocked. When the auxiliary transmission gear mechanism 251 outputs an auxiliary speed other than neutral, power is transmitted from the linear motor 64b to the left and right planetary gear mechanisms 268 via the auxiliary low-speed gear 254, the auxiliary medium-speed gear 255, or the auxiliary high-speed gear 256. On the other hand, when the output of the swing pump 70a is in neutral and the swing brake 279 is turned on, power transmission from the swing motor 70b to the left and right planetary gear mechanisms 268 is blocked. When the output of the swing pump 70a is set to a state other than neutral and the swing brake 279 is turned off, the rotational power of the swing motor 70b is transmitted to the left ring gear 273 via the left input gear mechanism 282 and the reverse gear 284, and to the right ring gear 273 via the right input gear mechanism 283.

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

[0051] In other words, when the slewing motor 70b is stopped and the left and right ring gears 273 are fixed stationary, when the straight-line motor 64b is driven, the rotational output from the straight-line motor shaft 260 is transmitted to the left and right sun gears 271 at the same rotation speed on the left and right, and via the planetary gears 272 and carriers 274, the left and right tracks 2 are driven at the same rotation speed in the same direction, causing the traveling body 1 to travel straight.

[0052] Conversely, when the slewing motor 70b is driven with the linear motor 64b stopped and the left and right sun gears 271 stationary and fixed, the left ring gear 273 rotates forward (reverse) and the right ring gear 273 rotates reverse (forward) due to the rotational power from the slewing motor shaft 261. As a result, one of the drive sprockets 51 of the left and right tracks 2 rotates forward and the other rotates backward, causing the traveling machine body 1 to change direction on the spot (pivot spin turn).

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

[0054] Next, referring to Figures 9 to 16, the working hydraulic circuit 180 and the traveling hydraulic circuit 200 of the full-type combine harvester of this embodiment will be described. As shown in Figures 9 to 14, the working hydraulic circuit 180 includes hydraulic actuators, such as a reaper lifting hydraulic cylinder 4, left and right reel lifting hydraulic cylinders 27L, 27R that support the raking reel 14 so that it can be raised and lowered, an auger lifting hydraulic cylinder 55 that supports the grain discharge auger 164 so that it can be raised and lowered, left and right machine body lifting hydraulic cylinders 56L, 56R that raise and lower the traveling machine 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 that switch the flow of hydraulic oil. The hydraulic valves 60A to 60E are incorporated into a hydraulic valve unit 60 mounted on the traveling machine body 1.

[0055] A hydraulic pump 59 is hydraulically connected to the reaping lifting hydraulic cylinder 4 via a reaping lifting hydraulic valve 60A. The reaping lifting hydraulic cylinder 4 is actuated by tilting a reaping position lever (not shown) on the driving operation unit (driver's cab) 5 forward or backward, allowing the operator to raise or lower the reaping unit 3 to a desired height (for example, reaping work height or non-working height). Meanwhile, a working hydraulic pump 59 is hydraulically connected to the reel lifting hydraulic cylinders 27L, 27R via a reel lifting hydraulic valve 60B. The reel lifting hydraulic cylinders 27L, 27R are actuated by tilting the reaping position lever (not shown) left or right, allowing the operator to raise or lower the raking reel 14 to a desired height and reap uncut stalks in the field.

[0056] A work hydraulic pump 59 is hydraulically connected to the auger lifting hydraulic cylinder 55 via the auger lifting hydraulic valve 60C. By tilting the grain discharge lever 155 on the driving operation unit (driver's cab) 5 forward and backward, the auger lifting hydraulic cylinder 55 is activated, and the operator raises and lowers the rice dumping opening of the grain discharge auger 164 on the grain discharge conveyor 8 to the desired height. An electric motor 165 rotates the grain discharge auger 164 horizontally together with the vertical feed auger 162 and bevel gear mechanism 163, thereby moving the rice dumping opening laterally. In other words, the rice dumping opening is positioned above the truck bed or container, and the grain in the grain tank 6 is discharged into the truck bed or container.

[0057] A hydraulic oil tank 57 and a work hydraulic pump 59 are hydraulically connected to the left machine body lifting hydraulic cylinder 56L via a left machine body lifting hydraulic valve 60D. Meanwhile, a hydraulic oil tank 57 and a work hydraulic pump 59 are hydraulically connected to the right machine body lifting hydraulic cylinder 56R via a right machine body lifting hydraulic valve 60E. The left and right machine body lifting hydraulic cylinders 56L, 56R are operated independently of each other, thereby lifting and lowering the left and right running machine bodies 1 independently.

[0058] Therefore, when the left and right machine body lifting hydraulic cylinders 56L, 56R are operated simultaneously to simultaneously lower the left and right track frames 50, 50 relative to the running body 1, the running body 1 moves away (rises) from the ground contact portions of the left and right tracks 2, 2, and the relative height (vehicle height) of the running body 1 to the ground contact portions of the tracks 2, 2 increases. Conversely, when the left and right track frames 50, 50 are raised simultaneously relative to the running body 1, the running body 1 moves closer (descends) to the ground contact portions of the left and right tracks 2, 2, and the relative height (vehicle height) of the running body 1 to the ground contact portions of the tracks 2, 2 decreases.

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

[0060] The hydraulic oil tank 57, hydraulic pump 59, and hydraulic valve unit 60 are each mounted on the traveling machine body 1 and are connected to one another via hydraulic piping 181-183. On the traveling machine 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 built into the hydraulic oil tank 57 and the hydraulic pump 59 are connected via hydraulic piping 181. Furthermore, on the traveling machine body 1, the hydraulic valve unit 60 is disposed 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 hydraulic piping 182. Furthermore, the hydraulic valve unit 60 is connected to the hydraulic oil tank 57 via hydraulic piping 183, which serves as a hydraulic oil return pipe.

[0061] The hydraulic oil tank 57 is installed on the traveling body 1 in a space surrounded by the feeder house 11 and the beater 18, and the engine 7 and hydraulic oil tank 57 are arranged side by side on the left and right in front of the traveling body 1. In other words, 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 prevents dust from the reaping unit 3 from accumulating in the hydraulic oil tank 57 and also prevents contamination of the hydraulic oil due to dust entering through the oil filler port 184, etc. Furthermore, because cooling air from the engine 7 flows into the installation space of the hydraulic oil tank 57, it is possible to prevent an increase in the hydraulic oil temperature without providing an oil cooler on the working hydraulic circuit 180, and each hydraulic component can be driven appropriately.

[0062] The hydraulic oil tank 57 has a fuel filler port 184 on its left side (the side facing outboard) that protrudes toward the left side (outboard side of the machine), and is 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 (outboard side) of the threshing section 9, the fuel filler port 184 and the oil filter 58 can be easily accessed. This makes it easy to fill the hydraulic oil tank 57 and replace the oil filter 58, and also improves the maintainability of the work system hydraulic circuit 180.

[0063] Furthermore, hydraulic pipes 181, 183 connected to the hydraulic oil tank 57 are arranged to extend to the left and right in front of the hydraulic oil tank 57 and the engine 7, and hydraulic pipe 182 connects the hydraulic pump 59 and oil filter 58 located in front of the engine 7. That is, the hydraulic pipes 181, 183 extend along the output shaft 65 of the engine 7, bypassing the front of the engine 7 toward the hydraulic oil tank 57. Furthermore, the hydraulic pipes 182, 183 extend rearward, passing below the cooling fan located on the right side of the engine 7, and are connected to the hydraulic valve unit 60. Therefore, the hydraulic pipes 181-183 are arranged in positions where they are less susceptible to radiant heat from the engine 7, with short pipe lengths, and the temperature of the hydraulic oil flowing through the hydraulic pipes can be prevented from becoming too high.

[0064] 14 to 16, the traveling hydraulic circuit 200 includes a linear pump 64a, a linear motor 64b, a swing pump 70a, a swing motor 70b, a transmission charge pump 151, an oil filter 152, and an oil cooler 153. The linear pump 64a and the linear motor 64b in the linear hydraulic continuously variable transmission 64 are connected in a closed loop by a linear closed oil passage 201. On the other hand, the swing pump 70a and the swing motor 70b in the swing hydraulic continuously variable transmission 70 are connected in a closed loop by a swing closed oil passage 202. The linear pump 64a and the swivel pump 70a are driven by the rotational power of the engine 7, and by controlling the swash plate angle of the linear pump 64a and the swivel pump 70a, the discharge direction and discharge amount of hydraulic oil to the linear motor 64b and the swivel motor 70b are changed, and the linear motor 64b and the swivel motor 70b operate in forward and reverse directions.

[0065] The traveling system hydraulic circuit 200 is provided with a linear valve 203 that is switched in response to manual operation of the main shift lever 44, and a linear cylinder 204 that is connected to the transmission charge pump 151 via the linear valve 203. When the linear valve 203 is switched, the linear cylinder 204 is actuated to change the swash plate angle of the linear pump 64a, and a linear speed change operation is performed in which the rotation speed of the linear motor shaft 260 of the linear motor 64b is continuously changed or reversed.

[0066] The traveling hydraulic circuit 200 is equipped with a swing valve 206 that is switched in response to manual operation of the control handle 43, and a swing cylinder 207 that is connected to the transmission charge pump 151 via the swing valve 206. When the swing valve 206 is switched, the swing cylinder 207 operates to change the swash plate angle of the swing pump 70a, and performs a left / right swing operation by continuously changing or reversing the rotation speed of the swing motor shaft 261 of the swing motor 70b, and the traveling direction of the traveling machine body 1 changes left and right to change direction or correct its course on the headland of the farm field.

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

[0068] Furthermore, charge branch oil passage 219 is connected to straight cylinder 204 via straight valve 203, and is also connected to swing cylinder 207 via swing valve 206. Furthermore, charge branch oil passage 219 is connected to transmission case 63 via surplus relief valve 220 and hydraulic pipe 210, and oil cooler 153 is installed midway through hydraulic pipe 210. Therefore, when surplus hydraulic oil from transmission charge pump 151 is returned to transmission case 63 via surplus relief valve 220, it is cooled by oil cooler 153.

[0069] Next, the engine room 146 in which the engine 7 is installed will be described with reference to Figures 8, 13, 14, etc. As shown in Figures 8, 13, 14, etc., a pair of left and right engine room supports 147 are erected on the upper surface of the traveling body 1 behind the cab 5, and a back panel 148 is stretched between the left and right engine room supports 147 to cover the rear of the engine room 146 below the driver's seat 42. In addition, a box-shaped wind tunnel case 170 is erected via an opening / closing fulcrum shaft 171 on the right engine room support 147 provided at the right end of the cab 5 of the traveling body 1. A dust net is stretched over the outboard opening on the right side of the wind tunnel case 170, and the presence of the dust net prevents straw and other debris from entering the wind tunnel case 170 and, ultimately, the engine room 146.

[0070] A water-cooled radiator 154 is installed upright on the inside of an air tunnel case 170 on the upper side of the traveling vehicle body 1, and the radiator 154 faces a cooling fan 149 of the engine 7. A shroud 150 is installed to cover the entire ventilation area of ​​the radiator 154, and the cooling fan 149 is disposed in an opening formed in the shroud 150. An oil cooler 153 is also installed within the air tunnel case 170. As the cooling fan 149 rotates, outside air (cooling air) is taken into the air tunnel case 170 from an opening on the outside of the air tunnel case 170 on the right side, and the dust-cleaned cooling air is sent into the engine room 146 from an opening on the inside of the air tunnel case 170 on the left side. As a result, the cooling air flowing into the engine room 146 cools the oil cooler 153, the radiator 154, the engine 7, etc.

[0071] Next, the configuration of the reaping support frame 36, which forms part of the machine housing 9b of the threshing section 9, and its surroundings will be described with reference to Figures 5, 6, 8, and 11-14. As shown in Figures 5, 6, 8, and 11-14, the reaping support frame 36 has left and right reaping support columns (front support frames) 36a erected from the top surface of the traveling machine body 1 in front of the left and right thresher housing columns (rear support frames) 34, respectively, and upper and lower reaping support frame beam frames 36b, 36c that connect the left and right thresher housing columns 34 and the left and right reaping support columns 36a at the front and rear. The reaping support frame beam frames 36b, 36c are erected at the upper ends and midway portions of the reaping support columns 36a and thresher housing columns 34, which are arranged at the front and rear, respectively.

[0072] The left and right beater bearings 38 are connected at their ends to the midpoints of the upper and lower reaping support frame beam frames 36b, 36c, respectively, and the beater 18 is journaled within the reaping support frame 36 by the left and right beater bearings 38. The reaping support frame 36 is provided with side plates 186 that cover the left and right sides of the beater 18, a top plate 187 that covers the top of the beater 18, a front plate 188 that covers the front of the beater 18, and a bottom plate 189 that covers the bottom of the beater 18. In other words, the reaping support frame 36 defines a closed space above the lower beam frame 36c that connects the rear end of the feeder house 11 to the handling opening 9a. The beater 18 is installed in this closed space to smoothly guide the grain stalks from the supply conveyor 17 to the handling opening 9a.

[0073] The side plates 186 are installed to enclose the area surrounded by the support columns 34, 36a and beam frames 36b, 36c, and have a hole through which the beater shaft 82, which is supported by the beater bearing 38 located outside the side plates 186, passes. The top plate 187 is mounted on the left and right beam frames 36b, and the threshing drum drive case 71 is installed on its upper surface. The front plate 188, with its front edge connected to the top plate 187's upper edge, extends downward above the feeder house 11. The front edge of the bottom plate 189 connects to the rear edge of a bottom plate 190 of the feeder house 11, and the rear edge of the bottom plate 189 connects to the front edge of the bottom of the threshing opening 9a in front of the threshing drum 21, so that the bottom plate 189 acts as a guide plate for the grain stalks from the feeder house 11 to the threshing opening 9a.

[0074] A hydraulic oil tank 57 is installed in the space below the installation space of the beater 18 of the reaping support frame 36, and the top of the hydraulic oil tank 57 is covered by a bottom plate 189. The front of the hydraulic oil tank 57 is covered by a front cover plate 191 connected to the bottom plate 189. A fan-shaped winnower 29 is provided behind the hydraulic oil tank 57, and the outer periphery of the winnower 29 is covered by a winnower cover plate 192. Therefore, within the reaping support frame 36, the hydraulic oil tank 57 is installed in the space surrounded by the bottom plate 189, front cover plate 191, and winnower cover plate 192.

[0075] The installation space for the hydraulic oil tank 57, defined by the bottom plate 189, front cover plate 191, and winnower cover plate 192, forms a passageway that is open on both the left and right sides and is connected to the right engine room 146. The machine housing 9b of the threshing section 9 is also equipped 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 pillar 34, which is located forward of the engine room support pillar 147. Therefore, part of the cooling air taken in from the outside by the cooling fan 149 passes through the engine room 146 and flows into the installation space for the hydraulic oil tank 57 in the reaping support frame 36, cooling the hydraulic oil tank 57.

[0076] Furthermore, due to the rotation of the winnower 29, a portion of the cooling air passing through the engine room 146 flows into the air passage defined by the winnower cover plate 192 at the rear of the installation space for the hydraulic oil tank 57. This creates an air flow that flows in the front-to-rear direction in the space between the engine room 146 and the threshing unit 9, and outside air is guided by this front-to-rear air flow and also flows in from the front of the traveling machine body 1. This outside air flows from the front of the traveling machine body 1 into the installation space for the hydraulic oil tank 57 and cools the hydraulic oil tank 57 together with some of the cooling air from the engine room 146. In other words, by actively flowing the exhaust air from the engine 7 toward the winnower 29, outside air flows into the installation space for the hydraulic oil tank 57 together with some of the cooling air from the engine 7, thereby enhancing the cooling effect of the hydraulic oil tank 57.

[0077] As described above, by configuring the cooling air from the engine compartment 146 to pass through the hydraulic oil tank 57, it is possible to suppress an increase in the temperature of the working oil circulating in the working hydraulic circuit 180, which includes the hydraulic oil tank 57. Therefore, not only is it not necessary to provide an oil cooler in the working hydraulic circuit 180, but by configuring the working hydraulic circuit 180 and the traveling hydraulic circuit 200 as separate systems, it is possible to configure the oil cooler 153 only for the traveling hydraulic circuit 200. As a result, the capacity of the oil cooler 153 can be reduced, and the cooling efficiency of the radiator 154 and engine 7, which are located downstream of the oil cooler 153 in the cooling air flow, can be improved.

[0078] Additionally, an auxiliary counter shaft 104 that receives driving force from the engine 7 is journaled on the threshing machine housing support pillar (rear support frame) 34, and a beater shaft 82 of the beater 18 is journaled by a beater bearing body 38 that is connected to the upper and lower reaping support frame beam frames 36b, 36c. A reaping input shaft 89, journaled at a position forward of the reaping support pillar (front support frame) 36a, passes through the feeder house 11. The threshing machine is provided with a first power transmission mechanism (a beater drive mechanism consisting of drive pulleys 107, 108 and a reaping drive belt 114) that transmits the rotational power of the auxiliary counter shaft 104 to the beater shaft 82, and a second power transmission mechanism (a reaping drive mechanism consisting of a reaping drive chain 115 and sprockets 116, 117) that transmits the rotational power of the beater shaft 82 to the reaping input shaft 89. The oil filler port 184 of the hydraulic oil tank 57 and the oil filter 58 are located in the area surrounded by the first and second power transmission mechanisms and the front cutting support pole 36a. This allows the hydraulic oil tank 57 to be filled with oil and the oil filter 58 to be replaced without removing the transmission materials (chains or belts) in the first and second power transmission mechanisms, thereby improving the ease of maintenance of the work system hydraulic circuit 180.

[0079] Furthermore, the threshing unit 9 supports the winnower 29 on the rear side of the threshing machine housing support column (rear support frame) 34, and a main counter shaft 76, which is rotatable relative to the winnowing shaft 100 of the winnower 29, penetrates the winnowing shaft 100. The main counter shaft 76 receives power from the engine 7 and transmits it to the sub-counter shaft 104, and the rotational power of the sub-counter shaft 104 is branched and transmitted to the winnowing shaft 100 and the beater shaft 82, respectively. The drive systems for driving the reaping unit 3, the grain sorting mechanism 10, and the winnower 29 are concentrated on the left side (outside the machine) of the threshing unit 9, making it possible to open the front right side (inside the machine) of the threshing unit 9. Therefore, the right side of the installation space for the hydraulic oil tank 57 below the front of the threshing unit 9 can be opened, allowing a large amount of cooling air to be guided into the installation space for the hydraulic oil tank 57. [Explanation of symbols]

[0080] 1 Running body 3 Reaping part 5. Driver's cab 7 Engine 9. Threshing Department 9a Handling port 9b Machine housing 11 Feeder House 17 Supply Conveyor 18 Vita 21 Thrusting body 29 Karawinoo 34 Threshing machine casing support 35 Reaping support frame 36a Harvesting support frame support pole 36b Beam frame for harvesting support frame 36c Beam frame for harvesting support frame 37 Reaping bearing body 38 Beater bearing body 57 Hydraulic oil tank 58 Oil filter 59 Hydraulic Pump 63 Mission Case 76 Winnowing Axis (Constant Rotation Axis) 82 Beater shaft (front rotor shaft) 89 Mowing input shaft 184 Fuel filler 185 Threshing Cover 186 Side Panel 187 Top Plate 188 Front Panel 189 Bottom plate 190 Bottom plate (feeder house) 191 Front cover plate 192 Winnower cover plate 193 Threshing Side Board

Claims

1. The threshing unit has a threshing drum, an engine, and a traveling machine body. In a combine harvester, a reaping section is provided in front of the threshing section, and the reaped stalks transported from the reaping section are fed into the threshing section. A hydraulic oil tank is disposed on one side of the traveling machine body in a machine body width direction, and the engine is disposed on the other side of the traveling machine body in a machine body width direction, The hydraulic oil tank has a filler port protruding toward the outside of the aircraft and has an oil filter installed therein. The oil filter is disposed outside the hydraulic oil tank.

2. 2. The combine harvester according to claim 1, wherein the oil filter is arranged so as to be insertable and detachable from outside the combine harvester.

3. 3. The combine harvester according to claim 1, wherein hydraulic piping connected to the hydraulic oil tank is arranged to extend left and right in front of the hydraulic oil tank and the engine.

4. 4. The combine harvester according to claim 3, wherein a portion of the hydraulic piping connects a hydraulic pump to the oil filter.

Images