Combine harvester

Abstract

To provide a combine harvester capable of removing dust attached to a dust-proof net and stably acquiring a cooling effect by an air conditioner by suppressing deterioration of a cooling function of an air conditioner.SOLUTION: A combine harvester includes a condenser fan 84 provided on a rear wall of a cabin covering a driving part, a cooling device provided on a lateral side of a traveling machine body so as to merge cooling air from an engine cooling fan 540 with cooling air from the condenser fan 84, and a controller 550 for controlling rotation of both fans 84 and 540. The engine cooling fan 540 is configured to rotate in reverse, with a direction of rotation for blowing cooling air defined as forward. The controller 550 has a first control mode for stopping the condenser fan 84 and reversely rotating the engine cooling fan 540, as a control mode of both fans 84 and 540.SELECTED DRAWING: Figure 17

Description

[Technical field]

[0001] The present invention relates to a combine harvester equipped with a cooling fan for an air conditioning unit that conditions the air inside a cabin that covers the driver's section, and a cooling fan for a cooling unit that cools the air supplied to an engine. [Background technology]

[0002] Some combine harvesters are equipped with a cooling fan for an air conditioning unit that conditions the air inside the cabin that covers the driver's section, and a cooling fan for a cooling unit that cools the air supplied to the engine (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a configuration in which an intercooler is provided as a cooling device on the side of a traveling vehicle body so that the cooling air from the cooling device cooling fan merges with the cooling air from the air conditioner cooling fan. In such a configuration, Patent Document 1 describes that the air conditioner cooling fan and the cooling device cooling fan are controlled to rotate at the same timing and in the same direction to blow away and remove dust that adheres to the dustproof net and causes a decrease in the cooling performance of the air conditioner and the intercooler. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2023-6628 A Summary of the Invention [Problem to be solved by the invention]

[0005] According to the reverse rotation control of the air conditioner cooling fan and the cooling device cooling fan as described in Patent Document 1, when these cooling fans rotate in the reverse direction, air heated by a heat source such as an exhaust device that is disposed at the rear of the cabin and discharges engine exhaust gas is drawn in by the air conditioner cooling fan, which can cause a decrease in the cooling function of the air conditioner.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a combine harvester that can remove dust adhering to a dust net, suppress a decrease in the cooling function of the air conditioning unit, and ensure a stable cooling effect from the air conditioning unit. [Means for solving the problem]

[0007] The combine harvester of the present invention has an air conditioning unit cooling fan provided on the rear wall of a cabin that covers the operating section, and a cooling fan for the cooling unit, the cooling unit being provided on the side of a running body so as to merge the cooling air from the cooling fan for the cooling unit with the cooling air from the cooling fan for the air conditioning unit, and is equipped with a cooling device for cooling air supplied to an engine provided on the running body, and a controller for controlling the rotation of the air conditioning unit cooling fan and the cooling unit cooling fan, the cooling unit cooling fan being configured to be able to rotate in reverse with the rotation direction for sending out the cooling air being the forward rotation direction, and the controller has a first control mode as a control mode for the air conditioning unit cooling fan and the cooling unit cooling fan, in which the air conditioning unit cooling fan is stopped and the cooling unit cooling fan is rotated in reverse.

[0008] In another aspect of the combine of the present invention, the air conditioning unit cooling fan is configured to be reversible with the direction of rotation for blowing cooling air being the forward direction, and the controller has as one of its control modes a second control mode in which the air conditioning unit cooling fan and the cooling unit cooling fan are simultaneously reversed.

[0009] In a combine harvester according to another aspect of the present invention, the controller executes the first control mode at every first time interval and executes the second control mode at every second time interval that is longer than the first time interval.

[0010] A combine harvester according to another aspect of the present invention includes a grain tank provided on the traveling body, and a grain discharge device provided rotatably relative to the traveling body for discharging grain in the grain tank to the outside, wherein when the controller detects a non-storage state of the grain discharge device, the controller stops the periodic execution of the first control mode at the first time interval and the periodic execution of the second control mode at the second time interval, and resumes the periodic execution of the first control mode and the second control mode on the condition that the controller detects a storage state of the grain discharge device and detects the traveling of the traveling body.

[0011] In another aspect of the combine of the present invention, when the controller detects the storage state of the grain discharge device and detects the traveling body traveling, the controller executes the first control mode or the second control mode for a predetermined period of time.

[0012] The combine harvester of the present invention is equipped with an air conditioner having an air conditioner cooling fan provided on a rear wall of a cabin covering a driving section, for conditioning the interior of the cabin; a cooling device having a cooling fan for a cooling device, which is provided on a lateral side of a traveling body so as to merge cooling air from the cooling fan for the cooling device with cooling air from the cooling fan for the air conditioner, for cooling air supplied to an engine provided on the traveling body; and a controller for controlling the rotation of the air conditioner cooling fan and the cooling fan for the cooling device, wherein the air conditioner cooling fan and the cooling fan for the cooling device are configured to be capable of rotating in reverse with the rotation direction for sending cooling air being the forward rotation direction, and when the air conditioner is in a stopped state, the controller basically stops the cooling fan for the air conditioner, and reverses the rotation of the cooling fan for the cooling device at every first time interval, and simultaneously reverses the rotation of the cooling fan for the air conditioner and the cooling fan for the cooling device at every second time interval longer than the first time interval. Effect of the Invention

[0013] According to the present invention, dust adhering to a dustproof net can be removed, and deterioration of the cooling function of an air conditioner can be suppressed, so that the cooling effect of the air conditioner can be stably obtained. [Brief description of the drawings]

[0014] [Figure 1] FIG. 2 is a left side view of a combine harvester according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a right side view of a combine harvester according to one embodiment of the present invention. [Diagram 3] FIG. 1 is a plan view of a combine harvester according to one embodiment of the present invention. [Figure 4] FIG. 2 is a right side view showing a cabin and an outside air introduction cover according to one embodiment of the present invention. [Diagram 5] FIG. 2 is a left side view of a cabin according to one embodiment of the present invention. [Figure 6] FIG. 2 is a right side view of a cabin according to an embodiment of the present invention. [Figure 7]FIG. 2 is a rear view of a cabin according to an embodiment of the present invention. [Figure 8] FIG. 2 is a right rear perspective view of a cabin according to an embodiment of the present invention. [Figure 9] FIG. 2 is a right side cross-sectional view of a cabin according to an embodiment of the present invention. [Figure 10] 2 is a plan view showing a schematic view of the inside of a roof portion of a cabin according to one embodiment of the present invention. FIG. [Figure 11] 1 is a schematic diagram showing the arrangement of a condenser unit, the arrangement of an air conditioning unit, and the arrangement of an intercooler according to an embodiment of the present invention; [Figure 12] FIG. 2 is a right rear perspective view showing the device configuration mounted on the front of the traveling body according to one embodiment of the present invention. [Figure 13] FIG. 2 is a left front perspective view showing the device configuration mounted on the front of the traveling body according to one embodiment of the present invention. [Figure 14] FIG. 2 is a right side view showing the device configuration mounted on the front of the traveling body according to one embodiment of the present invention. [Figure 15] FIG. 2 is a rear perspective view showing the configuration of a support frame and a connecting frame according to an embodiment of the present invention. [Figure 16] FIG. 2 is a left side view showing a support structure of the intercooler according to the embodiment of the present invention. [Figure 17] FIG. 2 is a block diagram showing a control configuration for a condenser fan and an engine cooling fan according to an embodiment of the present invention. [Figure 18] FIG. 4 is a diagram showing a table showing the relationship between the operating states of the engine and the air conditioner and the operating states of the condenser fan and the engine cooling fan according to one embodiment of the present invention. [Figure 19] FIG. 4 is a diagram showing a time chart of the operation of the condenser fan and the engine cooling fan according to the embodiment of the present invention. [Figure 20] 5 is a flowchart showing an example of a control mode of a condenser fan and an engine cooling fan according to an embodiment of the present invention. [Figure 21]5 is a flowchart showing another example of a control mode of the condenser fan and the engine cooling fan according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention aims to maintain the cooling function of the air conditioner while removing dust particles adhering to the dust screen by devising the operation control of the cooling fans in a configuration equipped with a cooling fan for an air conditioner for conditioning the air inside the cabin that covers the driver's section and a cooling fan for a cooling device for cooling the air supplied to the engine. Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] The overall configuration of a combine harvester 1 according to this embodiment will be described with reference to Figures 1 to 4. In the following description, the left and right sides of the combine harvester 1 facing the front (left side in Figure 1) are the left and right sides of the combine harvester 1, respectively.

[0017] As shown in Figures 1 to 3, the combine harvester 1 includes a traveling section 2 configured as a crawler-type traveling device having a pair of left and right crawler sections 3, 3, and a traveling body 4 supported by the traveling section 2. The combine harvester 1 includes a reaping section 5, a threshing section 6, a grain tank 7, a sorting section 8, a discharge auger 9, and a straw waste treatment section 10. As shown in Figures 1 to 3, the combine harvester 1 includes an engine 11 mounted on the traveling body 4 as a drive source. The combine harvester 1 also includes a cabin 30 that covers the driver's section 12 (see Figure 9).

[0018] Each crawler unit 3 constituting the traveling unit 2 has a track frame 3a extending in the front-rear direction below the traveling body 4, various rotating bodies such as a drive sprocket 3c supported by the track frame 3a, and a track 3b wound around these rotating bodies. The crawler unit 3 is driven by the power of the engine 11 transmitted to the drive sprocket 3c.

[0019] The reaping unit 5 is a device configuration for harvesting and collecting stalks of rice, wheat, etc. in the field, and is provided at the front of the traveling body 4. The reaping unit 5 is provided at the front of the traveling body 4 across substantially the entire width of the machine body of the combine harvester 1. The reaping unit 5 is attached to the traveling body 4 so as to be rotatable about a predetermined axis via a hydraulic cylinder for lifting and lowering, and is provided so as to be adjustable in elevation by the rotational movement caused by the extension and contraction of the hydraulic cylinder.

[0020] The reaping unit 5 has a reaping support frame 5a as a reaping frame, and is configured to support a grass dividing body 5b, a raising device 5c, a cutting blade device 5e, and a culm transport device 5f. The reaping unit 5 separates the culms in the field using the grass dividing body 5b, raises the divided culms using the raising device 5c, and cuts and reaps the raised culms using the cutting blade device 5e while transporting them rearward using the culm transport device 5f. The reaping unit 5 transports the reaped culms to the threshing unit 6. Each device constituting the reaping unit 5 is operated by power transmitted from the engine 11.

[0021] A threshing unit 6 that threshes the stalks harvested by the harvesting unit 5, and a grain tank 7 that serves as a grain storage unit that stores the grains removed from the threshing unit 6 are arranged side by side on the traveling machine body 4. The threshing unit 6 is located on the left side of the machine body, and the grain tank 7 is located on the right side of the machine body.

[0022] The threshing section 6 has a threshing drum 6a whose rotation axis direction is the front-to-rear direction, and a stump supplying device provided to the left of the threshing drum 6a. The stump supplying device holds the base of the stump cut by the reaping section 5 and transports the stump rearward in a lying position with the ear tip facing the threshing drum 6a. The stump supplying device has a feed chain wound around multiple sprockets whose rotation axis direction is the left-to-right direction, and a stump supplying clamping body that cooperates with the feed chain to clamp the base of the stump.

[0023] Below the threshing section 6 on the traveling machine body 4, a sorting section 8 is provided which sorts the processed material threshed by the threshing section 6. The sorting section 8 has a rocking sorting device 8a, and a wind sorting device and grain conveying device (not shown). The sorting section 8 rocks and sorts the processed material that has fallen from the threshing section 6 using the rocking sorting device 8a, and wind sorts the processed material after rocking and sorting using the wind sorting device. The sorting section 8 conveys grains from the processed material after wind sorting to the right toward the grain tank 7 using the grain conveying device, and blows straw dust, dust, etc. backwards using the wind sorting device and discharges them outside the machine body. The grains conveyed by the grain conveying device toward the grain tank 7 are stored in the grain tank 7.

[0024] A discharge auger 9 that discharges grains from the grain tank 7 to the outside is provided on the traveling body 4. The discharge auger 9 is provided so as to be rotatable relative to the traveling body 4 via a vertical take-out conveyor 9b provided on the right rear side of the traveling body 4. The discharge auger 9 is also provided so as to be rotatable up and down about its base.

[0025] In the stored state, the discharge auger 9 extends horizontally from the vertical take-out conveyor 9b on the right rear side of the traveling body 4 to the left front side. In the stored state, the discharge auger 9 is positioned with its tip on the left side of the reaping unit 5 in a plan view and extends along the diagonal line of the machine body (see FIG. 3). The discharge auger 9 is placed and supported on an auger rest 27 serving as an auger receiving part, thereby entering the stored state.

[0026] The auger rest 27 is provided in a state supported by a predetermined support member on the left side of the rear of the cabin 30. The auger rest 27 has a concave shape with an open upper side so as to store and support the cylindrical discharge auger 9 in a positioned state, and supports a predetermined portion of the discharge auger 9 in the middle in the extension direction from below.

[0027] The grains stored in the grain tank 7 are transported by a discharge auger 9 equipped with a screw conveyor, and are discharged from a discharge outlet 9a provided at the tip of the discharge auger 9. The grains discharged from the discharge outlet 9a are dumped into the bed of a truck, a container, or the like.

[0028] Thus, the combine harvester 1 is equipped with a grain tank 7 provided on the running body 4, and a discharge auger 9 which is rotatably mounted relative to the running body 4 and serves as a grain discharge device for discharging the grain in the grain tank 7 to the outside.

[0029] On the traveling machine body 4, behind the threshing section 6, there is provided a straw waste processing section 10 which processes the straw waste after threshing by the threshing section 6. The straw waste processing section 10 has a straw waste conveying device 10a and a straw waste cutting device 10b. The straw waste conveying device 10a conveys the threshed stump (stump) by the threshing section 6 rearward and discharges it outside the machine body or conveys it to the straw waste cutting device 10b. The straw waste cutting device 10b cuts the stump transported from the straw waste conveying device 10a and discharges it outside the machine body.

[0030] On the traveling body 4, to the right of the reaping unit 5 and in front of the grain tank 7, a driving unit 12 covered by a cabin 30 is provided (see FIG. 9). The driving unit 12 is provided inside the cabin 30 above the front part of the traveling body 4. As shown in FIG. 9, a handle 18 serving as a steering operation unit is provided in front of the driving unit 12, and a driver's seat 19 is provided behind the handle 18. In addition, to the left of the driver's seat 19, a side operation unit 20 is provided in which various operating tools such as a main speed change lever 21 and an auxiliary speed change lever 22 are arranged on a side column 23.

[0031] A prime mover section including an engine 11 installed in an engine room 13 is provided below and behind the driving section 12. The power of the engine 11 is transmitted to various devices in each section of the combine harvester 1 via a transmission and the like. The engine 11 is a diesel engine.

[0032] A radiator 14 is disposed in the engine compartment 13 on the right side of the engine 11 (see FIG. 3). The radiator 14 is provided midway through the circulation path of the coolant of the engine 11, and cools the coolant sent from the engine 11 by heat exchange with the outside air. The coolant cooled by the radiator 14 is returned to the engine 11. The radiator 14 has an outer shape of a rectangular plate, and is erected with its thickness oriented in the left-right direction.

[0033] The traveling body 4 has a machine base 25 that is horizontally configured by frame members, plate-shaped members, etc. that are arranged in the front-rear or left-right direction on the track frame 3a. In the front-rear direction, the rear side of the machine base 25 extends rearward from the rear end of the crawler unit 3.

[0034] The engine 11, threshing unit 6, and grain tank 7 are provided on the machine base 25. The engine 11 is mounted on the machine base 25 at a position toward the right side of the front part, with the axial direction of the output shaft being the left-right direction. In other words, the engine 11 is disposed on the right side of the front part of the traveling body 4. The threshing unit 6 and grain tank 7 are provided on the machine base 25 at a portion rearward of the engine 11. In addition, a transmission case 26 is provided between the left and right crawler units 3 on the front side of the machine base 25 (see FIG. 13). The power of the engine 11 is transmitted to the left and right crawler units 3 via the transmission case 26.

[0035] 2 and 4, an outside air introduction cover 15 is provided on the right side of the engine 11 as an engine cover that covers the right side of the engine room 13. The radiator 14 is located inside the outside air introduction cover 15. In other words, the radiator 14 is disposed between the engine 11 and the outside air introduction cover 15. The outside air taken in through the outside air introduction cover 15 is used for heat exchange in the radiator 14.

[0036] The outside air introduction cover 15 is provided on the right side of the combine harvester 1, between the cabin 30 and the grain tank 7. The outside air introduction cover 15 is provided so as to be flush with the right side surface of the grain tank 7.

[0037] The rear edge of the outside air introduction cover 15 is formed in a straight line along the vertical direction in a side view. The outside air introduction cover 15 is supported rotatably with the up-down direction as the rotation axis direction via a hinge part (not shown) on a support pole (not shown) erected on the traveling body 4 so as to be along the rear edge. The outside air introduction cover 15 is provided so as to be openable and closable so as to open from the front side by a rear rotation support part relative to the support pole.

[0038] When the outside air introduction cover 15 is closed, the right side of the engine 11 and the radiator 14, which is the outside side of the engine 11 and the radiator 14, is covered by the outside air introduction cover 15, and the right side of the engine room 13 is closed. When the outside air introduction cover 15 is opened, the right side of the engine room 13 is opened.

[0039] The outside air introduction cover 15 is provided with a rotary screen 16. The rotary screen 16 is configured to take in outside air into the engine room 13 as cooling air for the engine 11. The rotary screen 16 is rotatably supported by a rotation support portion located at the center of a circular opening 16a formed in the outside air introduction cover 15, and is configured to rotate by being driven by a motor (not shown).

[0040] The rotary screen 16 has a configuration in which a mesh-like dustproof net 16b is stretched over a circular opening 16a. The dustproof net 16b collects dust, dirt, straw, etc., and prevents the dust, etc. from entering the engine room 13 together with the outside air. The dust, etc. collected by the dustproof net 16b is removed by a suction device 17 provided on the outside of the rotary screen 16. The suction device 17 is configured to suck in the dust, etc. attached to the dustproof net 16b and discharge it outside the machine.

[0041] Moreover, an upper cover part 24 is provided on the upper side of the outside air introduction cover 15. The upper cover part 24 is a plate-shaped cover part, and is provided so as to form a right side part that is flush with the outside air introduction cover 15. The upper cover part 24 is provided in a state where it is fixed to a predetermined frame part or the like.

[0042] As described above, the combine harvester 1 includes the cabin 30 that covers the driver's section 12, the engine 11 provided below and behind the cabin 30, and the outside air intake cover 15 arranged to the side of the engine 11.

[0043] The configuration of the cabin 30 will be described with reference to Figures 4 to 9. The cabin 30 has a front portion 31, a rear wall portion 32, a left side wall portion 33, a right side wall portion 34, a roof portion 35 forming a ceiling portion, and a floor portion 36, and these portions form a generally box-like shape as a whole.

[0044] The front portion 31 of the cabin 30 has a forward-inclined upper front surface portion 31a constituting the majority of the upper side thereof, and a front lower surface portion 31b constituting the substantially lower half of the front portion 31, and has an overall curved shape concave toward the rear in a side view. The front upper surface portion 31a is formed as a transparent window portion entirely by a rectangular transparent plate made of glass, acrylic resin, polycarbonate resin, or the like. The front lower surface portion 31b is made of a metal member such as a steel plate.

[0045] The lower portion of the left side wall 33 of the cabin 30 is a lower side portion 41 that is a sheet metal portion made of a steel plate or the like (see FIG. 5). A straight left support pillar 42 is provided on the upper side of the lower side portion 41 of the left side wall 33, and is located in the middle of the left side wall 33 in the front-to-rear direction and extends along the up-down direction.

[0046] A rectangular left rear window 43 is provided on the left side wall 33 behind the left support column 42. The left rear window 43 is configured by attaching a rectangular transparent plate 45 made of glass or the like to a frame-shaped window frame 44 having the left support column 42 as its front edge in the upper portion of the lower side surface portion 41. Also, a left front window 47 made of a transparent plate such as glass is provided on the left side wall 33 in front of the left support column 42. The left front window 47 has a substantially inverted trapezoidal shape, and its front edge is aligned with the forward inclination of the front upper surface portion 31a of the front surface portion 31.

[0047] The right side wall 34 of the cabin 30 has a right front support portion 49 erected in front of the right side wall 34, and a right rear support portion 50 erected in the rear of the right side wall 34. The right front support portion 49 has a lower portion 49a aligned with the inclination of the front lower surface portion 31b of the front surface portion 31 in a side view, and an upper portion 49b extending in the vertical direction. The right front support portion 49 is erected at a right front position of the floor portion 36, and is provided over substantially the entire right side wall portion 34 in the vertical direction.

[0048] The right rear support column 50 is provided parallel to and at approximately the same height as the upper portion 49b of the right front support column 49. The right rear support column 50 is erected at a position intermediate between the front and rear of the right edge of the rear wall portion 32, which is provided with a downward sloping front in a side view. A door 51, which is an opening and closing door for getting on and off and which constitutes most of the right side wall portion 34, is provided between the right front support column 49 and the right rear support column 50. The door 51 is supported by support portions 52 provided at two positions, above and below the right rear support column 50, so as to be rotatable with the vertical direction as the rotation axis direction.

[0049] The upper part of door 51 is an openable and closable window 56. Substantially the entire lower part of door 51 is formed of a transparent plate 57 such as glass. Door 51 has a shape in which the front edge of the lower part follows the slope of lower part 49a of right front support part 49 in side view, and the rear edge of the lower part follows the downward front slope of rear wall part 32 in side view.

[0050] Further, a right front window 59 is provided in the right side wall 34, in front of the upper part of the door 51. Further, a substantially inverted triangular transparent window 70 is provided in the right side wall 34 of the cabin 30, behind the right rear support pillar 50. The right side wall 34 is, of the left and right side walls of the cabin 30, the side wall on which the outside air introduction cover 15 is located.

[0051] The roof portion 35 of the cabin 30 has a generally rectangular shape with the longitudinal direction being the front-to-rear direction in a plan view. The front edge of the roof portion 35 protrudes forward in a eaves-like manner from the upper end of the front surface portion 31, and the rear edge protrudes rearward in a eaves-like manner from the upper end of the rear wall portion 32.

[0052] The floor 36 of the cabin 30 forms a horizontal floor surface portion 63 in front of and below the driver's seat 19 (see FIG. 9). A substantially horizontal seat support surface portion 65 is provided on the rear side of the floor surface portion 63 via a front-down inclined surface portion 64. The driver's seat 19 is installed on the seat support surface portion 65.

[0053] For the cabin 30 having the above-mentioned configuration, the outside air introduction cover 15 is provided so that its front portion in a side view is located below the rear wall portion 32. That is, in a right side view, the front portion of the outside air introduction cover 15 located below the cabin 30 and the rear portion of the cabin 30 overlap each other.

[0054] The outside air introduction cover 15 has an inclined side portion 15a forming an upper portion of the front edge, and in a right side view, the inclined side portion 15a is provided in a state of butting against the rear edge portion of the right side wall portion 34 of the cabin 30 from the rear side, forming a boundary portion 67 inclined downward toward the front between the outside air introduction cover 15 and the cabin 30 (see FIG. 4). The outside air introduction cover 15 is disposed so that the inclined side portion 15a and the rear wall portion 32 are aligned in a side view.

[0055] As shown in Fig. 11, the cabin 30 is equipped with an air conditioner 80 for performing cooling and heating operations (air conditioning) for the interior of the cabin 30. The air conditioner 80 is operated by an air conditioning operation unit provided in the driving unit 12. The air conditioning operation unit includes, for example, a switch for turning the air conditioner 80 on and off, a dial for adjusting the set temperature, and the like.

[0056] Air conditioner 80 includes a condenser unit 81 as a so-called outdoor unit, and an air conditioner unit 82 as a so-called indoor unit. Condenser unit 81 is provided on rear wall portion 32 which is the rear side of cabin 30. Air conditioner unit 82 is a component for conditioning air inside cabin 30, and is provided in roof portion 35 of cabin 30.

[0057] Condenser unit 81 has a condenser 83 and a condenser fan 84 which is a cooling fan that sends air for heat exchange to condenser 83. Condenser fan 84 is an example of an air-conditioning cooling fan provided in rear wall portion 32 of cabin 30. Condenser 83 is configured to include a pipe for circulating a refrigerant, which is arranged, for example, in a multi-stage folded shape.

[0058] 11, condenser fan 84 is an electric fan having a fan body 85 and an electric fan motor 86 as a drive source for driving fan body 85. A drive shaft of fan motor 86 is connected to a rotation shaft of fan body 85. Condenser fan 84 is configured so that fan body 85 can be rotated in both a forward rotation direction and a reverse rotation direction by the driving force of fan motor 86.

[0059] Condenser unit 81 is configured to have a roughly square, thick plate-like outer shape, and is arranged vertically in rear wall 32 of cabin 30, with the plate thickness direction being the front-to-rear direction. Condenser unit 81 has condenser 83 arranged on the front side, and condenser fan 84 is attached so as to overlap the rear side of condenser 83. Condenser unit 81 is provided in such a manner that the front portion of condenser 83 is embedded in rear wall 32 of cabin 30.

[0060] Thus, the combine harvester 1 includes the condenser 83 of the air conditioning device 80 disposed on the rear side of the cabin 30. The condenser 83 is disposed on the lower side of the rear wall portion 32 of the cabin 30. That is, the condenser 83 is provided on the rear wall portion 32 at a position closer to the lower side in the up-down direction, and is disposed below the rear wall portion 32.

[0061] In the rear wall 32 of the cabin 30, an upper portion of the location where the capacitor unit 81 is disposed is an upper inclined surface 32a that follows the inclination of the boundary portion 67 in a side view. The upper inclined surface 32a is a surface portion that has a horizontally long rectangular shape in a rear view, and forms an inclined back surface portion that slopes upward toward the rear at the upper rear side of the cabin 30. The capacitor unit 81 is provided so as to be located at the middle of the rear wall 32 in the left-right direction. A rear window portion 90 configured by fixing a transparent plate such as a substantially rectangular glass plate is provided in the upper inclined surface 32a.

[0062] The air conditioning unit 82 has a heat exchanger 95 including an evaporator, a heater, etc., and a blower fan 96 that blows air to the heat exchanger 95. The heat exchanger 95 and the blower fan 96 are provided in communication with each other. The heat exchanger 95 and the blower fan 96 are arranged side by side on the left and right, with the blower fan 96 on the left and the heat exchanger 95 on the right, at the rear part within the roof portion 35. The air conditioning unit 82 is provided above the condenser unit 81.

[0063] The roof section 35 has a flat outer shape and is hollow. The roof section 35 has a lower panel section 97, which is a frame section constituting the main body of the roof section 35, and an upper panel section 98, which is provided above the lower panel section 97 and forms the upper surface of the cabin 30, and these panel sections form a hollow section. The upper panel section 98 is a cover section provided to cover the entire lower panel section 97 from above and both the left and right sides. A recessed section 97d protruding downward is formed at the rear of the lower panel section 97, and the recessed section 97d provides an air conditioner housing section 99 for housing the air conditioner unit 82 at the rear of the hollow section of the roof section 35.

[0064] 11, a refrigerant supply channel 101 and a refrigerant return channel 102 are provided between the condenser 83 and the heat exchanger 95. One end of the refrigerant supply channel 101 is connected to one end of a pipe for circulating a refrigerant in the condenser 83, and the other end is connected to one end of the refrigerant channel in the heat exchanger 95. One end of the refrigerant return channel 102 is connected to the other end of the pipe for circulating a refrigerant in the condenser 83, and the other end is connected to the other end of the refrigerant channel in the heat exchanger 95. These channels are formed by piping members such as hoses, connecting metal fittings, and the like.

[0065] A receiver 103 for filtering and drying the refrigerant is provided in the refrigerant supply passage 101. A compressor 104 is provided in the refrigerant return passage 102. The compressor 104 is connected to the engine 11 and is driven by the power of the engine 11.

[0066] Further, a heat medium supply passage 211 and a heat medium return passage 212 are provided between the engine 11 and the heat exchanger 95. One end of the heat medium supply passage 211 is connected to a predetermined portion of the coolant passage in the engine 11, and the other end is connected to one end of the heat medium passage in the heat exchanger 95. One end of the heat medium return passage 212 is connected to the other end of the heat medium passage in the heat exchanger 95, and the other end is connected to a predetermined portion of the coolant passage in the engine 11. The heat medium supply passage 211 and the heat medium return passage 212 are each formed of a piping member such as a hose.

[0067] The cooling water of the engine 11, whose temperature has increased due to heat generated by the engine 11, is sent to the radiator 14 (see FIG. 3) by driving a pump (not shown), and is also supplied as a heat medium to the heater (heater core) of the heat exchanger 95 by a heat medium supply passage 211. The water as a heat medium supplied to the heat exchanger 95 heats the air passing through the heater core and is used to generate hot air. The water used to generate hot air in the heat exchanger 95 is returned to the engine 11 side by the heat medium return passage 212, and is used as cooling water for the engine 11 together with the water cooled by the radiator 14.

[0068] As shown in FIG. 10, in the roof portion 35, an air supply duct 105 is provided in front of the air conditioning unit 82 to send the air for air conditioning obtained by the air conditioning unit 82 into the cabin 30. The air for air conditioning is cold air generated by the evaporator of the heat exchanger 95, which is compressed and sent through the air supply duct 105 by a compressor 104 and blown out from an air outlet 106 provided for the cabin 30. The air supply duct 105 has a communication connection portion 105b for the heat exchanger 95 located at the rear as a base, and is bifurcated from the base into left and right branch duct portions 105a. Each branch duct portion 105a is connected to the air outlet 106 provided on the lower side of the front portion of the roof portion 35.

[0069] 6, an outside air intake 110 for taking in outside air for the condenser 83 is provided below the transmission window 70 in a side view. The outside air intake 110 is configured by opening an outside air flow space 111 formed in the rear wall 32 of the cabin 30 so as to face the front side of the condenser 83 to the right side. The outside air flow space 111 is a space portion that allows outside air to flow from the right side of the cabin 30.

[0070] The outside air flow space 111 is formed in the upper and lower middle part of the rear wall part 32 of the cabin 30. The outside air flow space 111 is a flat space part formed by a substantially vertical front wall part 112 forming the indoor part of the cabin 30 in the rear wall part 32, a rear wall part 113 provided parallel to the front wall part 112 behind the front wall part 112, and left and right side parts and a bottom part. The condenser 83 is provided so as to penetrate the rear wall part 113 forming the outside air flow space 111, and a front part of the condenser 83 is located within the outside air flow space 111. An opening for mounting the condenser 83 is formed in the rear wall part 113.

[0071] The outside air intake 110 is provided as a vertically long opening portion such that the entire lower half is open on the right side surface portion 114 (see FIG. 6) of the outside air circulation space portion 111. The outside air introduction cover 15 is located to the right of the outside air intake 110 (see FIG. 4).

[0072] The outside air intake 110 is provided at a position overlapping with the outside air introduction cover 15 in a side view. That is, in a right side view, the outside air intake 110 is entirely or almost entirely covered by the outside air introduction cover 15. In this embodiment, the outside air intake 110 is provided at a position overlapping with an upper part of the outside air introduction cover 15 in a side view. Specifically, the outside air intake 110 is located near an upper front corner of the outside air introduction cover 15 in a right side view.

[0073] A guide surface portion 115 that widens outward (to the right) from the outside air intake 110 is provided on the rear and lower sides around the outside air intake 110. A dustproof member such as a mesh member may be attached to the outside air intake 110.

[0074] 11, outside air is taken into outside air flow space 111 from outside air intake 110 by the suction force of condenser fan 84 rotating forward (see arrow C1). The outside air taken into outside air flow space 111 passes through condenser 83 while exchanging heat therein, and is discharged to the rear of cabin 30 as exhaust air (see arrow C2).

[0075] On the other hand, by the condenser fan 84 rotating in the reverse direction, outside air passes from the condenser fan 84 through the condenser 83 and is taken into the outside air flow space 111 (see arrow C3). The outside air taken into the outside air flow space 111 is discharged to the outside from the outside air intake 110 (see arrow C4).

[0076] Further, an outside air introduction duct 120, which is an outside air introduction section for taking in outside air into the air conditioning unit 82, is provided below the roof portion 35. The outside air introduction duct 120 constitutes an outside air introduction path for taking in outside air into the air conditioning unit 82. This outside air introduction path is an air flow path for taking in outside air outside the cabin 30 into the air conditioning housing portion 99 in the roof portion 35, which is the installation space for the air conditioning unit 82.

[0077] 8, the outside air introduction duct 120 is provided as a duct forming portion along the vertical direction in the corner on the rear left side of the cabin 30, and forms an outside air introduction path extending in the vertical direction. The outside air introduction duct 120 has an outer shape of a substantially square tube so as to form a substantially rectangular shape with the longitudinal direction being the front-to-rear direction in a plan cross-sectional view.

[0078] The outside air introduction duct 120 is provided on the rear side of the left side wall 33 of the cabin 30 so as to form a side surface flush with the left side wall 33 and to protrude rearward with respect to the rear wall 32. The lower side of the outside air introduction duct 120, which is the upstream side of the outside air introduction path, opens to the outside of the cabin 30. The upper side of the outside air introduction duct 120, which is the downstream side of the outside air introduction path, can communicate with the inside of the air conditioner housing 99 in the roof portion 35 via an openable and closable shutter portion 125 (see FIG. 10). The shutter portion 125 is provided on the left side of the air conditioner housing 99.

[0079] As shown in Fig. 10, the shutter section 125 has a plate-shaped shutter body 160 that opens and closes an opening formed in a peripheral wall (side wall) of the lower panel section 97 that constitutes the roof section 35. The shutter body 160 is supported by front and rear hinge sections 163 on a mounting plate 162 fixed to the lower surface of the lower panel section 97 so as to be rotatable with the front-rear direction as the rotation axis direction. A motor 165 for opening and closing the shutter body 160 is attached to the rear side of the mounting plate 162. The drive shaft of the motor 165 is connected to the shutter body 160 via an operating arm 167. When the motor 165 is driven, the operating arm 167 operates to push and pull the shutter body 160, thereby opening and closing the shutter body 160.

[0080] The air conditioning unit 82 is configured so that its operation mode can be switched between an outside air introduction mode in which outside air is introduced through the outside air introduction duct 120 and an inside air circulation mode in which inside air is circulated within the cabin 30 by opening and closing the shutter portion 125. With regard to the inside air circulation mode, an inside air inlet 123 through which the inside air of the cabin 30 flows in is provided in front of the air conditioning unit 82 (see FIG. 9 ). The inside air inlet 123 is provided in a wall portion on the front side of the recessed portion 97d of the lower panel portion 97 that constitutes the roof portion 35.

[0081] The outside air introduction duct 120 has an intake port 138 for taking in outside air as an outside air introduction port. The intake port 138 is formed at the lower end of the right side surface of the outside air introduction duct 120, and is provided so as to open toward the inside in the left-right direction of the cabin 30. The intake port 138 opens the outside air introduction path of the outside air introduction duct 120 facing the outside. An air cleaning filter (not shown) is provided inside the outside air introduction duct 120. An openable window 180 for maintenance of the filter, etc. is provided at the left side surface of the outside air introduction duct 120.

[0082] In this configuration, when the shutter section 125 changes from a closed state to an open state, outside air flows into the air conditioner housing section 99 from the outside air introduction duct 120, and the air conditioner unit 82 switches to an outside air introduction mode. On the other hand, when the shutter section 125 changes from an open state to a closed state, inside air in the cabin 30 flows into the air conditioner housing section 99 from the inside air inlet 123, and the air conditioner unit 82 switches to an inside air circulation mode. The suction action of the blower fan 96 is used to flow the outside air or inside air into the air conditioner housing section 99.

[0083] The opening and closing of the shutter section 125 is switched by the operation of a predetermined operation section provided in the driving section 12. This operation section is an operation mode switching operation section for the air conditioner 80, and is an operation section for switching between the introduction of outside air and the circulation of inside air by the air conditioner unit 82. The operation mode switching operation section has an operation tool such as a button or a switch, and is connected to the motor 165 via a control section (not shown). The control section receives an input of an operation signal generated by the operation of the operation mode switching operation section, and outputs a control signal based on the operation signal to the motor 165, thereby operating the motor 165 to open and close the shutter main body 160.

[0084] As shown in Figures 12 to 14, the combine harvester 1 is equipped with an exhaust gas purification device 330 for purifying exhaust gas from the engine 11. The exhaust gas purification device 330 is provided on the rear side of the cabin 30, and is an example of an exhaust device that discharges exhaust gas from the engine 11. The exhaust gas purification device 330 has a DPF case 331 and an SCR case 332, and purifies the exhaust gas by introducing exhaust gas from the engine 11 into these cases and removing particulate matter such as soot and nitrogen oxides (NOx) contained in the exhaust gas.

[0085] The DPF case 331 is a diesel particulate filter case that removes particulate matter in the exhaust gas of the engine 11. The SCR case 332 is a case that forms a selective catalytic reduction (SCR) system using urea and removes nitrogen oxide substances in the exhaust gas of the engine 11.

[0086] The DPF case 331 has a diesel oxidation catalyst and a soot filter provided therein. The diesel oxidation catalyst is an oxidation catalyst such as platinum that generates nitrogen dioxide (NO2). The soot filter is a honeycomb filter that continuously oxidizes and removes trapped particulate matter at a relatively low temperature. The SCR case 332 has an SCR catalyst and an oxidation catalyst provided therein. The SCR catalyst is a catalyst for selective catalytic reduction of urea.

[0087] The DPF case 331 and the SCR case 332 are both configured as substantially cylindrical cases and are approximately the same size. In each of the DPF case 331 and the SCR case 332, the longitudinal direction (cylinder axis direction) of the substantially cylindrical outer shape is the direction of exhaust gas flow inside the case. The DPF case 331 and the SCR case 332 are provided with the longitudinal direction of the substantially cylindrical outer shape as the front-rear direction, and are vertically arranged with the DPF case 331 on the lower side and the SCR case 332 on the upper side.

[0088] In the vertical direction, the exhaust gas purification device 330 is provided so that the DPF case 331 and the SCR case 332 are located above the main body of the engine 11. The exhaust gas purification device 330 is disposed in the front-rear direction immediately behind the rear wall 32 of the cabin 30 (see Figs. 1 and 2). The exhaust gas purification device 330 is disposed in the left-right direction at a position substantially in the left-right center of the traveling body 4, between the threshing section 6 and the grain tank 7 (see Fig. 3). The exhaust gas purification device 330 is disposed below the roof section 35 of the cabin 30, on the left rear side of the cabin 30 (see Figs. 1 and 3).

[0089] With the above-described arrangement of the exhaust gas purification device 330, the DPF case 331 and the SCR case 332 are arranged behind the driving section 12 located above the engine 11, and on the right side, which is the inner left and right side of the threshing section 6, in a vertical line-up with the longitudinal direction as the front-to-rear direction.

[0090] A turbocharger 340 is provided in an exhaust manifold constituting an exhaust gas outlet at the front side of the upper part of the engine 11 (see FIG. 13). The turbocharger 340 has an exhaust turbine and a compressor that are coaxially driven with each other, and forcibly sends air into the engine 11. One end (upstream side) of an exhaust pipe 341 that introduces exhaust gas from the engine 11 into the DPF case 331 is connected in communication with the exhaust gas outlet side of the turbocharger 340. The other end (downstream side) of the exhaust pipe 341 is connected in communication with an exhaust gas inlet port provided on the lower front side of the DPF case 331.

[0091] A DPF outlet pipe 342 that discharges exhaust gas from the DPF case 331 extends from the rear surface of the DPF case 331. The DPF outlet pipe 342 extends from the rear surface of the DPF case 331 to the upper left and then turns back toward the front. The downstream side of an elbow-shaped SCR inlet pipe 343 that faces the rear is connected in communication with an exhaust gas inlet port provided on the lower left side of the front part of the SCR case 332.

[0092] The downstream side of the DPF outlet pipe 342 and the upstream side of the SCR inlet pipe 343 face each other in the front-rear direction, and a urea mixing pipe (not shown) that communicates and connects the DPF outlet pipe 342 and the SCR inlet pipe 343 is provided between these pipes. The exhaust gas discharged to the rear side from the DPF case 331 turns its flow back to the front side by the DPF outlet pipe 342, and is introduced into the SCR case 332 via the urea mixing pipe and the SCR inlet pipe 343.

[0093] An SCR outlet pipe 346 that discharges exhaust gas from within the SCR case 332 is provided at the rear of the SCR case 332. A tail pipe 347 is attached to the other end (downstream side) of the SCR outlet pipe 346. A urea injection unit 348 is provided at the DPF outlet pipe 342. Urea water (aqueous urea solution for selective catalytic reduction) stored in a urea water tank is supplied to the urea injection unit 348 by a urea water supply device (not shown). The urea injection unit 348 sprays the supplied urea water into the urea mixing tube by an injection valve. The urea water supplied into the urea mixing tube is mixed as ammonia into the exhaust gas discharged from the DPF case 331 and introduced into the SCR case 332.

[0094] In the exhaust gas purification device 330 having the above-mentioned configuration, the exhaust gas of the engine 11 passes through the DPF case 331, so that the particulate matter contained in the exhaust gas is continuously oxidized and removed, and the content of carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas is reduced. The exhaust gas in the urea mixing pipe discharged from the DPF case 331 is mixed with ammonia generated by hydrolysis by injecting urea water from the urea injection unit 348, and is introduced into the SCR case 332. The exhaust gas introduced into the SCR case 332 is subjected to a reduction action of the content of nitrogen oxides (NOx) by passing through the SCR case 332. The exhaust gas of the engine 11 purified by the DPF case 331 and the SCR case 332 in the above-mentioned manner is discharged outside the aircraft through the SCR outlet pipe 346 and from the tail pipe 347 diagonally left rearward and upward.

[0095] The support structure of the exhaust gas purification device 330 on the traveling body 4 will be described. The exhaust gas purification device 330 is supported on the machine base 25 of the traveling body 4 by a support frame 360 ​​and a connecting frame 380 (see FIG. 15). The support frame 360 ​​is a frame that supports the driving section 12, and is provided on the machine base 25 of the traveling body 4. The connecting frame 380 is a frame that connects the support frame 360 ​​to the machine base 25 of the traveling body 4.

[0096] As shown in Fig. 15, the support frame 360 ​​and the connecting frame 380 are configured to form a framework surrounding the engine 11 installed at the front of the machine base 25, forming an engine room 13 (see Fig. 3). A cooling fan (not shown) surrounded by a shroud is provided on the right side of the engine 11, and a radiator 14 is installed to the right of the cooling fan. When the cooling fan is driven to rotate, outside air for cooling is taken into the engine room 13 through a rotary screen 16 of an outside air intake cover 15 arranged on the right side of the radiator 14 (see Figs. 3 and 4).

[0097] The support frame 360 ​​has a horizontal frame 361 arranged in the left-right direction above the front of the engine 11, a front-rear extension frame 362 arranged in the front-rear direction to the right of the engine 11 at approximately the same height as the horizontal frame 361, and three pillars: a front-left pillar 363, a front-right pillar 364, and a rear-right pillar 365. All of these frames and pillars that make up the support frame 360 ​​are formed from square steel pipes.

[0098] The front left support pillar 363 is erected on a support base 373 provided on the machine base 25 at a position to the left of the engine 11. The front right support pillar 364 is located forward of the front left support pillar 363 in the front-to-rear direction, and is erected on the machine base 25 at a position to the right front of the engine 11. The rear right support pillar 365 is positioned approximately at the same position in the left-right direction as the front right support pillar 364, is located rearward of the front right support pillar 364, and is erected on the machine base 25 at a position to the right rear of the engine 11.

[0099] The front-rear extension frame 362 extends along the front-rear direction in a plan view, and is supported on both the front and rear sides by a front right support column 364 and a rear right support column 365. The upper end sides of the front right support column 364 and the rear right support column 365 are fixed to the front-rear extension frame 362 by welding or the like.

[0100] The horizontal frame 361 is horizontally installed between the front left support pillar 363 and the front-rear extension frame 362. The left end of the horizontal frame 361 is fixed by welding or the like to the front surface of the upper and lower middle part of the front left support pillar 363. The right end of the horizontal frame 361 is located above the front part of the front-rear extension frame 362, and is fixed and supported by the front-rear extension frame 362 via a predetermined support bracket 366 or the like.

[0101] The horizontal frame 361 is a frame that supports the rear of the cabin 30 from below. On both the left and right sides of the horizontal frame 361, there are provided support base portions 367 that are horizontal plate-like portions that protrude rearward from the horizontal frame 361. The support base portions 367 are portions that receive support legs (not shown) that are provided at the rear of the bottom surface of the cabin 30. The support legs are made of an elastic material such as rubber.

[0102] The cabin 30 is supported by the horizontal frame 361 with the support legs abutting from above against the left and right receiving pedestals 367. The cabin 30 is provided on the machine base 25 in such a manner that it can rotate forward with the left and right direction as the rotation axis direction by a predetermined rotation support part provided in front of the engine 11, and the rear part of the cabin 30 is detachable from the left and right receiving pedestals 367. With the above-mentioned configuration, the driver's section 12 provided in the cabin 30 is supported by the support frame 360 ​​provided on the machine base 25.

[0103] The connecting frame 380 has a central front-rear extension frame 381 disposed in the front-rear direction above the engine 11, and a rear central support pillar 382 provided behind the engine 11. The central front-rear extension frame 381 and the rear central support pillar 382 are both formed from square steel pipes.

[0104] The rear central support pillar 382 is erected at a position rearward of the left-right central portion of the engine 11 on the machine base 25. The rear central support pillar 382 is provided at a position approximately in the center between the front left support pillar 363 and the front right support pillar 364 in the left-right direction, and is provided at a position rearward of the rear right support pillar 365 in the front-rear direction.

[0105] The central front-rear extension frame 381 extends horizontally along the front-rear direction and is supported at both front and rear ends by the horizontal frame 361 and the rear central support pillar 382. The front end of the central front-rear extension frame 381 is located above approximately the left-right center of the horizontal frame 361 and is fixed and supported via a support bracket 384 or the like. The rear end of the central front-rear extension frame 381 is supported from below by the rear central support pillar 382.

[0106] In this way, the central front-rear extension frame 381 and the rear central support 382 that form the connecting frame 380 form an L-shaped frame portion having one end connected and supported by the horizontal frame 361 and the other end supported on the machine base 25. For the connecting frame 380, a support frame body 390 is provided on the central front-rear extension frame 381.

[0107] The support frame 390 is a fixing member that fixes and supports the DPF case 331 and the SCR case 332 to the connecting frame 380. That is, the DPF case 331 and the SCR case 332 are provided on a central front-rear extension frame 381 that constitutes the connecting frame 380 in a fixed and supported state via the support frame 390.

[0108] The support frame 390 is a member having a substantially rectangular plate-like outer shape, and is fixed and supported via a predetermined support member to the central front-rear extension frame 381 with the plate thickness direction in the outer shape being the left-right direction. The DPF case 331 and the SCR case 332 are located on the threshing section 6 side, i.e., the left side, relative to the support frame 390, and are fixed and supported to the support frame 390 by a predetermined fixing member or the like. The support frame 390 is, for example, a cast part, and has high rigidity.

[0109] The DPF case 331 and the SCR case 332 are covered by a cover support frame 420. The cover support frame 420 has approximately the same dimensions as the support frame 390 in the front-rear direction, and is provided to cover the DPF case 331 and the SCR case 332 from above and from the left. The cover support frame 420 is fixed and supported on the threshing unit 6 side at one side, and fixed and supported on the support frame 390 at the other side, and is provided to straddle the upper part of the SCR case 332 from left to right.

[0110] The cover support frame 420 is supported by the threshing section 6 by fixing support members 425 provided at the front and rear lower ends on the left side to a flat surface portion 430 (see Figure 3) provided on the upper surface of the threshing section 6. In this way, the cover support frame 420 is provided in a manner extending from the threshing section 6, and is fixed to the upper side of the support frame 390 beyond the top of the SCR case 332, supporting the support frame 390, which supports the DPF case 331 and the SCR case 332, relative to the threshing section 6.

[0111] The combine harvester 1 is provided with an intercooler 500 as a cooling device that cools the air supplied to the engine 11 provided on the traveling body 4. The intercooler 500 functions as a heat exchanger that receives air discharged from a compressor of the turbocharger 340 of the engine 11 and cools the air. The air cooled by the intercooler 500 is supplied to the intake manifold of the engine 11 as supply air to the engine 11.

[0112] The intercooler 500 is disposed on the outer side of the exhaust gas purification device 330. In this embodiment, the intercooler 500 is installed in a position on the right side of the DPF case 331 and the SCR case 332 that are disposed above and below the exhaust gas purification device 330. The intercooler 500 is provided on the machine base 25 at a position above and to the right of the engine 11, in a state where it is supported by a predetermined support member.

[0113] Intercooler 500 has a box-shaped case 501 having a substantially rectangular parallelepiped outer shape that forms the exterior of the device. Intercooler 500 is installed with the longitudinal direction of the substantially rectangular parallelepiped outer shape of case 501 aligned in a plan view as the front-to-rear direction, and the longitudinal direction aligned in a front-to-rear direction as the up-and-down direction.

[0114] The intercooler 500 is provided at approximately the same height as the DPF case 331 and the SCR case 332 in the vertical direction. Specifically, in the intercooler 500, a lower surface portion 501a of the case 501 is positioned below the lower end of the DPF case 331 and an upper surface portion 501b of the case 501 is positioned above the upper end of the DPF case 331 in the vertical direction. In addition, in the intercooler 500, an upper surface portion 501b of the case 501 is positioned below the upper end of the SCR case 332 in the vertical direction.

[0115] As described above, the exhaust gas purification device 330 and the intercooler 500 are disposed facing each other in the left-right direction with a space between them behind the driving unit 12 disposed above the engine 11. In this embodiment, the intercooler 500 is located to the right of the DPF case 331 and the SCR case 332, and is provided with the left side surface portion of the case 501 facing the support frame 390 located to the right of the DPF case 331 and the SCR case 332.

[0116] The intercooler 500 disposed to the right of the exhaust gas purification device 330 is located inside (left side) of the upper part of the outside air introduction cover 15 (see FIG. 2). An outside air intake port 503 is provided in the upper part of the outside air introduction cover 15 above the rotary screen 16.

[0117] 4, the air inlet 503 has a configuration in which a mesh-like dustproof net 503b is stretched over an opening 503a formed in the outside air introduction cover 15. The opening 503a has an arc shape that follows the outer shape of the upper part of the outside air introduction cover 15 and has its lower side aligned with the circular shape of the opening 16a of the rotary screen 16. The intercooler 500 is disposed so that most of it overlaps with the air inlet 503 when viewed from the right side.

[0118] An air inlet pipe 505 and an air outlet pipe 506 are arranged between the intercooler 500 and the engine 11 (see FIG. 11).

[0119] An upstream side, which is one end side of the air inlet pipe 505, is connected in communication with the compressor side of the turbocharger 340. As shown in Fig. 16, a downstream side, which is the other end side of the air inlet pipe 505, is connected in communication with an air inlet 507 provided in the front part of the lower side of the lower surface part 501a of the case 501. The air inlet pipe 505 is also arranged so as to pass under the horizontal frame 361. The air inlet 507 is provided in the front part of a duct part 509 provided on the lower side of the lower surface part 501a of the case 501, and is a cylindrical protruding part that opens to the left.

[0120] The air inlet pipe 505 is disposed leftward from the inlet 507 and extends downward and forward on the right side of the engine 11, and is connected from the right side to the turbocharger 340 provided at the upper front part of the engine 11. The air inlet pipe 505 supplies air discharged from the compressor of the turbocharger 340 to the intercooler 500. The air supplied to the intercooler 500 is cooled while passing through a predetermined air passage 504 (see FIG. 11) having fins or the like provided in the case 501.

[0121] An upstream side, which is one end side, of the air outflow pipe 506 is connected in communication with an outlet 508 provided at the rear part of the lower side of the lower surface part 501a of the case 501 (see FIG. 16). The outlet 508 is a cylindrical protruding part provided at the rear part of the duct part 509 and opening toward the left. A downstream side, which is the other end side, of the air outflow pipe 506 is connected in communication with an intake manifold of the engine 11.

[0122] The air outflow pipe 506 extends from the outlet 508 toward the left front lower side and is connected from the right side to the intake manifold located at the upper rear of the engine 11. The air outflow pipe 506 supplies air cooled inside the case 501 to the intake manifold of the engine 11.

[0123] The intercooler 500 is provided in a state supported by the support frame 360, similar to the exhaust gas purification device 330. The intercooler 500 is provided in a state supported on the front-rear extension frame 362 constituting the support frame 360. The intercooler 500 is supported on the front-rear extension frame 362 by fixing support stays 512 provided on the case 501 to support protrusions 511 provided on the front-rear extension frame 362 on both the front and rear sides of the case 501. The intercooler 500 is supported on the front-rear extension frame 362. The support protrusions 511 and the support stays 512 form support portions 510 of the intercooler 500 relative to the front-rear extension frame 362.

[0124] The support protrusion 511 is a bent plate-like protruding portion that is substantially U-shaped in plan view. The support protrusion 511 has a flat surface portion with the plate thickness direction in the left-right direction as a fixing surface portion 511a to which the support stay 512 is fixed. A fixing hole portion is formed through the fixing surface portion 511a. The support protrusion 511 is provided at two locations, front and rear, of the case 501.

[0125] Support stay 512 is a longitudinal bent plate-like member having a substantially L-shaped cross section, and is fixed, with its longitudinal direction being the up-down direction, to each of front surface 501d and rear surface 501e of case 501. Support stay 512 has, as surfaces forming a substantially L-shaped cross section, fixing surface 512a fixed to the case 501 side and supporting surface 512b fixed to the support protrusion 511 side.

[0126] The support stay 512 is provided with respect to the case 501, with an upper portion of the fixing surface portion 512a fixed to the front surface portion 501d or the rear surface portion 501e by welding or the like, and a lower portion protruding downward from the lower surface portion 501a. The support stay 512 is fixed to the support projection portion 511 by a fixing bolt 513, with the lower end portion of the support surface portion 512b overlapping the fixing surface portion 511a of the support projection portion 511 from the right side. The fixing bolt 513 passes through the support surface portion 512b and the fixing surface portion 511a, and is screwed into a nut portion 514 provided on the left side of the support surface portion of the support projection portion 511.

[0127] In this way, the support stays 512 form legs that protrude downward on both the front and rear sides of the case 501, and the lower ends of the legs are fixed to the support protrusions 511 that protrude from the front-rear extension frame 362. Therefore, a space is formed between the upper surface 362c of the front-rear extension frame 362 and the lower surface 501a of the case 501, and this space serves as an arrangement space for the duct portion 509 to which the air inlet pipe 505 and the air outlet pipe 506 are connected, etc.

[0128] As described above, the combine harvester 1 has, as a frame configuration provided on the machine base 25, the connecting frame 380 serving as a first support frame supported by the support frame 360 ​​and supporting the exhaust gas purification device 330, and the front-rear extension frame 362 serving as a second support frame supporting the intercooler 500. The connecting frame 380 and the front-rear extension frame 362 are connected and supported to each other by the horizontal frame 361 serving as a connecting member.

[0129] The intercooler 500 is connected to and supported by two support rods, a first support rod 521 and a second support rod 522, which are installed between the intercooler 500 and a support frame 390 that supports the exhaust gas purification device 330. The first support rod 521 and the second support rod 522 are both straight pipe-shaped members having a circular cross section, and are arranged in the approximately left-right direction with a slight downward slope to the right. The first support rod 521 is located rearward of the second support rod 522.

[0130] As described above, intercooler 500 provided on machine base 25 has engine cooling fan 540, which is a cooling device cooling fan capable of blowing air toward exhaust gas purification device 330. As shown in Fig. 11, engine cooling fan 540 is an electric fan having fan body 541 and electric fan motor 542 as a drive source for driving fan body 541. A drive shaft of fan motor 542 is connected to the central shaft of fan body 541.

[0131] Engine cooling fan 540 is configured to be rotatable in both forward and reverse directions. That is, engine cooling fan 540 is configured to be able to rotate fan body 541 in both forward and reverse directions by the driving force of fan motor 542.

[0132] Engine cooling fan 540 is disposed on the left side within case 501, with the rotation axis direction of fan body 541 oriented as the left-right direction. A vent hole 501f, which is a circular opening, is formed concentrically with fan body 541 in left side portion 501c of case 501 (see FIG. 16). Vent hole 501f is formed so as to expose substantially the entire engine cooling fan 540 when viewed from the left side.

[0133] Meanwhile, the right side surface of case 501 has a configuration in which mesh-like dustproof net 501g is stretched over a rectangular frame portion that follows the outer shape of case 501 (see FIG. 14). As shown in FIG. 14, on the right side surface of case 501, a dustproof rotating blade 544 that rotates due to an airflow generated by the rotation of engine cooling fan 540 is provided on the outside (right side) of dustproof net 501g.

[0134] 11, when the engine cooling fan 540 rotates forward, the suction force of the engine cooling fan 540 causes the intake port 503 of the outside air introduction cover 15 located on the right side of the intercooler 500 to become an intake port for outside air, which is supplied to the intercooler 500. That is, the air taken in from the intake port 503 is taken into the case 501 through the dustproof net 501g as cooling air for the air passing through the air passage 504, and is sent to the left from the ventilation port 501f of the case 501 while exchanging heat through the outer wall surface of the air passage 504 (see arrow D1). The air sent out from the ventilation port 501f is sent to the DPF case 331 and the SCR case 332 side.

[0135] Meanwhile, engine cooling fan 540 rotates in the reverse direction, so that air inside the machine body is taken into case 501 through ventilation opening 501f. The air taken into case 501 is exhausted through dustproof net 501g and is also exhausted to the outside through intake opening 503 of outside air introduction cover 15 (see arrow D2).

[0136] When the engine cooling fan 540 rotates in the forward direction, dust such as dirt, dust particles, and straw is collected by the dustproof net 503b of the intake port 503 and the dustproof net 501g of the case 501, and the dust is prevented from entering the case 501 together with the outside air. On the other hand, when the engine cooling fan 540 rotates in the reverse direction, the dust attached to the dustproof net 501g of the case 501 and the dustproof net 503b of the intake port 503 is removed by the air blown from the engine cooling fan 540. Note that even when the condenser fan 84 rotates in the reverse direction, the dust attached to the dustproof net 503b of the intake port 503 of the outside air introduction cover 15 is removed by the air blown out from the outside air intake 110.

[0137] The combine 1 also includes an air cleaner 561 and a pre-cleaner 562 which constitute an air intake system of the engine 11. The air cleaner 561 and the pre-cleaner 562 are connected to each other by an air intake pipe 563.

[0138] The pre-cleaner 562 is provided at the upstream end of the air intake path for the engine 11, and air is taken into the air intake path from the pre-cleaner 562. The pre-cleaner 562 removes dust and the like from the air, and purifies the air taken into the air intake path.

[0139] An air cleaner 561 is provided downstream of the pre-cleaner 562 via an air intake pipe 563. The air cleaner 561 further purifies the air purified by the pre-cleaner 562 and supplies it to the engine 11. The air cleaner 561 has a substantially cylindrical outer shape, and is disposed between the exhaust gas purification device 330 and the intercooler 500 with its cylinder axis direction (longitudinal direction) oriented in the front-rear direction. A downstream air intake pipe 565 extends from the air discharge side of the air cleaner 561, and the downstream side of the downstream air intake pipe 565 is connected in communication with an air intake section provided on the compressor side of the turbocharger 340 (see FIG. 13).

[0140] Air intake pipe 563 is provided to pass between first support rod 521 and second support rod 522. Air intake pipe 563 is supported with respect to intercooler 500 by a straight rod-shaped piping support rod 570 extending from intercooler 500. Pipe support rod 570 has a lower end portion fixed to an upper portion of rear surface portion 501e of case 501 by a bolt or the like, and an upper end portion fixed to an intermediate portion of air intake pipe 563.

[0141] According to the above-described layout configuration of the intake system of the engine 11, the DPF case 331 and the SCR case 332 are arranged vertically at the upper left rear of the engine 11, and the air cleaner 561 and the pre-cleaner 562 are arranged vertically at the upper right rear of the engine 11. That is, the exhaust gas purification device 330 (DPF case 331 and SCR case 332) connected to the exhaust pipe 341 extending rearward from the exhaust turbine side (left side) of the turbocharger 340 located at the front of the engine 11, the air cleaner 561 connected to the downstream intake pipe 565 extending rearward from the compressor side (right side) of the turbocharger 340 and the pre-cleaner 562 arranged above it are arranged on the left and right sides at the upper rear of the engine 11.

[0142] The combine 1 of this embodiment as described above is equipped with a condenser unit 81 of an air conditioning system 80 provided on the rear wall portion 32 of the cabin 30 and including a condenser 83 and a condenser fan 84, and an intercooler 500 having an engine cooling fan 540.

[0143] The combine harvester 1 has the following configuration regarding the intercooler 500. That is, the intercooler 500 is provided on the lateral side of the traveling body 4 so that the cooling air from the engine cooling fan 540 merges with the cooling air from the condenser fan 84.

[0144] 11, the condenser fan 84 is provided behind the condenser 83 provided in the rear side wall portion 113 that forms the outside air flow space portion 111 in the rear wall portion 32 of the cabin 30. The direction of cooling air from the condenser fan 84 is rearward (see arrow C2 in FIG. 11).

[0145] With respect to the condenser fan 84 thus arranged, the intercooler 500 is provided on the right side at the rear of the cabin 30. The intercooler 500 is arranged near the left side of the outside air introduction cover 15 which covers, from the right side, the outside air intake 110 which opens to the right into the outside air flow space 111. The direction of cooling air from the engine cooling fan 540 located on the left side of the intercooler 500 is to the left (see arrow D1 in FIG. 11).

[0146] The destination of the cooling air from the engine cooling fan 540 is the same space as the destination of the cooling air from the condenser fan 84. That is, the space behind the rear wall 32 of the cabin 30, which is the destination of the cooling air from the condenser fan 84, overlaps with the space to which the cooling air from the engine cooling fan 540 is discharged, forming a cooling air junction 600 where the cooling air from both the condenser fan 84 and the engine cooling fan 540 join together. The cooling air junction 600 is a space in which the exhaust gas purification device 330 and the like are disposed.

[0147] In this way, intercooler 500 is provided to the right of cooling air junction 600 so that cooling air from engine cooling fan 540 is directed toward cooling air junction 600 at the rear of cabin 30, which is the destination of cooling air from condenser fan 84 of condenser unit 81. In other words, intercooler 500 is provided so that the exhaust direction of cooling air from engine cooling fan 540 is to the left of condenser fan 84, which exhausts cooling air toward the rear, and the exhaust directions of cooling air from both fans are perpendicular to each other.

[0148] In the combine harvester 1, an outside air intake 110 for taking in outside air for the condenser 83 is provided at a position aligned side by side with the intercooler 500 in a side view of the traveling body 4.

[0149] As described above, the outside air intake 110 opens toward the right of the rear wall 32 of the cabin 30, while the intercooler 500 is provided on the right rear side of the cabin 30. That is, the outside air intake 110 is provided in a position near the front of the intercooler 500, while the intercooler 500 is provided at a position on the right rear side of the cabin 30 so that the sides of the rectangular parallelepiped case 501 face forward, backward, left and right (see Figs. 4 and 6). In this way, the outside air intake 110 and the intercooler 500 are provided lined up in front and rear on the right side of the front part of the traveling body 4.

[0150] Further, the intercooler 500 is disposed between the cabin 30 and the grain tank 7. The grain tank 7 is located behind the cabin 30 on the traveling body 4, and is provided behind the outside air introduction cover 15 in the front-to-rear direction. The intercooler 500 is provided such that the entire case 501 is covered from the right side by the outside air introduction cover 15.

[0151] Therefore, with respect to the intercooler 500 provided to the rear and right side of the cabin 30, the grain tank 7 is provided so that its front portion 7a, which is a vertical flat portion, is located behind the intercooler 500 (case 501) (see FIG. 2). In this way, the intercooler 500 is provided on the right side of the traveling body 4, so as to be located between the cabin 30 and the grain tank 7 in the front-rear direction.

[0152] The control configuration for the condenser fan 84 and the engine cooling fan 540 (hereinafter referred to as "both fans 84, 540") and the control of these fans will be described.

[0153] 17, the combine harvester 1 includes a controller 550 that controls the rotation of the condenser fan 84 and the engine cooling fan 540. Both fans 84, 540 are connected to the controller 550 by a predetermined connection cable. The controller 550 controls the operation of both fans 84, 540, i.e., forward rotation, reverse rotation, and stop of the fans.

[0154] The controller 550 controls each part of the combine harvester 1 based on input signals from various sensors and the like provided in the combine harvester 1. The controller 550 includes a central processing unit (CPU) as an arithmetic processing device that executes various arithmetic processing and control, storage devices such as random access memory (RAM) and read only memory (ROM), input / output devices (input / output circuits) such as an input / output interface for data input / output, and peripheral circuits such as a clock circuit, all connected via a bus or the like. The CPU of the controller 550 performs arithmetic processing according to various programs stored in the ROM or the like.

[0155] The controller 550 includes, for example, a plurality of microcomputer units connected to each other so as to be able to communicate with each other via a controller area network (CAN). However, the configuration of the controller 550 is not particularly limited.

[0156] For the condenser fan 84, the operation of the fan motor 86 is controlled by the controller 550, thereby controlling the direction of rotation of the fan body 85. The condenser fan 84 and the controller 550 are configured to control the operation of the condenser fan 84 by controlling the fan motor 86 by, for example, PWM (Pulse Width Modulation) control.

[0157] In PWM control, when the condenser fan 84 is rotated in the forward direction, a PWM output for forward motor rotation from the controller 550 is input to the fan motor 86, the fan motor 86 rotates in the forward direction, and the fan body 85 rotates in the forward direction. On the other hand, when the condenser fan 84 is rotated in the reverse direction, a PWM output for reverse motor rotation from the controller 550 is input to the fan motor 86, the fan motor 86 rotates in the reverse direction, and the fan body 85 rotates in the reverse direction.

[0158] With regard to the engine cooling fan 540, the operation of the fan motor 542 is controlled by the controller 550, thereby controlling the direction of rotation of the fan main body 541. The engine cooling fan 540 and the controller 550 are configured to control the operation of the engine cooling fan 540 by controlling the fan motor 542 by PWM control, for example, in the same manner as the condenser fan 84. That is, when a PWM output for motor forward rotation from the controller 550 is input to the fan motor 542, the fan motor 542 rotates in the forward rotation direction and the fan main body 541 rotates in the forward rotation direction, and when a PWM output for motor reverse rotation from the controller 550 is input to the fan motor 542, the fan motor 542 rotates in the reverse rotation direction and the fan main body 541 rotates in the reverse rotation direction.

[0159] The rotation speed of each fan can also be changed in the rotation control of both fans 84, 540 by the controller 550. The rotation direction of each fan may be controlled by an operation unit provided in the driving unit 12, for example.

[0160] As described above, the condenser fan 84 and the engine cooling fan 540 are configured to be able to rotate in the reverse direction with the direction of rotation for blowing cooling air being the forward direction. The controller 550 has, as control modes for the condenser fan 84 and the engine cooling fan 540, a first control mode in which the condenser fan 84 is stopped and the engine cooling fan 540 is rotated in the reverse direction, and a second control mode in which both fans 84, 540 are simultaneously rotated in the reverse direction.

[0161] For example, in a normal operating state of the combine harvester 1 in which the combine harvester 1 harvests grain stalks, the controller 550 basically rotates both the condenser fan 84 and the engine cooling fan 540 in the forward direction. In the following, with regard to the control of the condenser fan 84 and the engine cooling fan 540 by the controller 550, the control of rotating both fans 84, 540 in the forward direction is referred to as "forward rotation control."

[0162] Then, while the controller 550 basically performs forward rotation control when the combine harvester 1 is in an operating state, it executes a first control mode in which the condenser fan 84 is stopped and the engine cooling fan 540 is reversed, or a second control mode in which both fans 84, 540 are reversed, at a predetermined timing or under predetermined conditions.

[0163] The purposes of forward and reverse rotation of condenser fan 84 and engine cooling fan 540 can be summarized as follows: Condenser fan 84 rotates forward to cool condenser 83 of air conditioner 80 while air conditioner 80 is operating. Engine cooling fan 540 rotates forward to cool air supplied to engine 11 while engine 11 is operating.

[0164] When the combine harvester 1 is in operation, the condenser fan 84 and the engine cooling fan 540 continue to rotate in the forward direction, causing dust to accumulate on the dustproof net 503b of the suction port 503 and the dustproof net 501g of the case 501, resulting in a problem of reduced cooling performance by these fans. Therefore, while the combine harvester 1 is in operation, the condenser fan 84 and the engine cooling fan 540 are periodically rotated in the reverse direction to remove dust that has adhered to the dustproof net 503b, etc.

[0165] In order to efficiently remove dust adhering to the dustproof net 503b, etc., it is preferable to synchronize the timing of reversing the rotation of both fans 84, 540. In other words, by reversing the rotation of both fans 84, 540 at the same time, the highest dust removal effect can be obtained for dust adhering to the dustproof net 503b, etc. Also, according to a control in which one of the condenser fan 84 and the engine cooling fan 540 is reversed and the other is stopped, a certain dust removal effect can be obtained, although it does not reach the removal effect when both fans 84, 540 are reversed at the same time.

[0166] On the other hand, when one of the condenser fan 84 and the engine cooling fan 540 is rotated in the reverse direction while the other is rotated in the forward direction, dust blown off the dustproof net 503b by the reverse rotating fan is sucked in by the forward rotating fan. For this reason, it is not preferable to reverse one fan and rotate the other fan in the forward direction. In addition, reversing the rotation of the condenser fan 84 and the engine cooling fan 540 reduces the cooling capacity of these fans. In particular, it is preferable to reverse the rotation of the condenser fan 84 infrequently, since a reduction in the cooling capacity leads to a deterioration in the effectiveness of the air conditioner inside the cabin 30.

[0167] Considering the above-described purpose of forward / reverse rotation of condenser fan 84 and engine cooling fan 540, that is, the action obtained by forward / reverse rotation, the frequency of executing the first control mode is set higher than the frequency of executing the second control mode in controller 550. That is, controller 550 executes the first control mode at every first time interval, and executes the second control mode at every second time interval that is longer than the first time interval.

[0168] In the working state of the combine harvester 1, the controller 550 executes a first control mode every 5 minutes with a first time interval S1 of 5 minutes, and executes a second control mode every 60 minutes with a second time interval S2 of 60 minutes, as an example only. In each of the first and second control modes, the controller 550 causes both fans 84, 540 to perform an operation corresponding to each control mode for a predetermined time (hereinafter referred to as "control mode execution time") that is set in advance. The control mode execution time is set to, for example, about 10 to 30 seconds.

[0169] According to the above example, while the combine harvester 1 is in operation, the controller 550 basically performs forward rotation control, stops the condenser fan 84 and reverses the engine cooling fan 540 every 5 minutes during the control mode execution time, and simultaneously rotates both fans 84, 540 in reverse every 60 minutes during the control mode execution time. In other words, the controller 550 executes the second control mode in preference to the first control mode at one of the 12 times the first control mode is executed every 5 minutes.

[0170] In this way, as one aspect of the control of both fans 84, 540 by the controller 550, the first control mode and the second control mode for both fans 84, 540 are repeatedly performed at a predetermined timing (time interval) set in advance while the combine harvester 1 is in an operating state. Note that the length of the control mode execution time may be set to be the same for the first control mode and the second control mode, or may be set to be different for each other.

[0171] The relationship between the operating state of the combine harvester 1 and the operating states of both fans 84, 540 will be described with reference to Fig. 18 and Fig. 19. Fig. 18 is a diagram showing a table showing the relationship between the operating state of the combine harvester 1 and the operating states of the condenser fan 84 and the engine cooling fan 540. Fig. 19 is a diagram showing a time chart showing the operation of the condenser fan 84 and the engine cooling fan 540.

[0172] There are four operating states of the condenser fan 84 and the engine cooling fan 540 depending on the operating states of the engine 11 and the air conditioner 80 (air conditioner). As shown in Fig. 18, the operating states of the engine 11 and the air conditioner include a first operating state in which both the engine 11 and the air conditioner are stopped, a second operating state in which the engine 11 is stopped and the air conditioner is operating, a third operating state in which the engine 11 is operating and the air conditioner is stopped, and a fourth operating state in which both the engine 11 and the air conditioner are operating. Both fans 84, 540 are controlled to perform predetermined operations under these four operating states.

[0173] As shown in Fig. 18 and Fig. 19, in the first operating state, both fans 84, 540 are stopped. In the first operating state, since the engine 11 is stopped, it is not necessary to cool the engine 11, and it is not necessary to rotate the engine cooling fan 540 in the forward direction. In addition, in the first operating state, since the air conditioner is stopped, it is not necessary to cool the condenser 83, and it is not necessary to rotate the condenser fan 84 in the forward direction (it is stopped). In addition, in the first operating state, since the engine 11 is stopped and the combine harvester 1 is not in a working state, dust does not accumulate on the dustproof net 503b, etc., and it is not necessary to rotate the both fans 84, 540 in the reverse direction.

[0174] As shown in Figs. 18 and 19, in the second operating state, the engine cooling fan 540 is stopped and the condenser fan 84 is rotated forward. In the second operating state, the engine 11 is stopped as in the first operating state, so there is no need to cool the engine 11, and there is no need to rotate the engine cooling fan 540 forward. In the second operating state, the air conditioner is in operation, so there is no need to cool the condenser 83, and there is no need to rotate the condenser fan 84 forward. In the second operating state, the engine 11 is stopped as in the first operating state, so there is no dust accumulation on the dustproof net 503b, etc., and there is no need to rotate the fans 84, 540 in the reverse direction.

[0175] As shown in Figs. 18 and 19, in the third operating state, the engine cooling fan 540 is in a forward or reverse rotation state, and the condenser fan 84 is in a stopped or reverse rotation state. In the third operating state, the engine 11 is in an operating state, so it is necessary to cool the engine 11, and it is necessary to rotate the engine cooling fan 540 in the forward direction. In the third operating state, the air conditioner is stopped as in the first operating state, so it is not necessary to cool the condenser 83, and it is not necessary to rotate the condenser fan 84 in the forward direction (it is stopped). In the third operating state, the engine 11 is in an operating state, and the combine harvester 1 is in an operating state, so dust may accumulate on the dustproof net 503b, etc., and it is necessary to rotate both fans 84, 540 in the reverse direction.

[0176] As shown in Fig. 18 and Fig. 19, in the fourth operating state, the engine cooling fan 540 is in a forward or reverse rotation state, and the condenser fan 84 is in a forward or reverse rotation state or stopped state. In the fourth operating state, the engine 11 is in an operating state as in the third operating state, so that the engine 11 needs to be cooled, and the engine cooling fan 540 needs to be rotated forward. In the fourth operating state, the air conditioner is in an operating state as in the second operating state, so that the condenser 83 needs to be cooled, and the condenser fan 84 needs to be rotated forward. In the fourth operating state, the engine 11 is in an operating state as in the third operating state, so that the combine harvester 1 is in an operating state, so that dust may accumulate on the dustproof net 503b, etc., and therefore both fans 84, 540 need to be rotated in reverse.

[0177] In the table shown in FIG. 18, "forward rotation + reverse rotation" means "forward rotation as the base, with short-time reverse rotation every certain time." Also, in the same table, "stop + reverse rotation" means "stopped state as the base, with short-time reverse rotation every certain time." Also, in the same table, "forward rotation + reverse rotation + stop" means "forward rotation as the base, with short-time reverse rotation or short-time stop every certain time."

[0178] In the relationship between the operating states of the engine 11 and the air conditioner and the operating states of the fans 84, 540 as described above, the first control mode and the second control mode by the controller 550 are performed in the fourth operating state. As described above, reversing the rotation of the fans 84, 540 can cause a decrease in the cooling capacity of the fans, and in particular, in order to maintain the effectiveness of the air conditioner, it is preferable to infrequently reverse the rotation of the condenser fan 84.

[0179] Therefore, in the fourth operating state, the controller 550 performs a short-term stop operation for the condenser fan 84 instead of the short-term reverse operation performed at regular intervals, and sets one out of several short-term stop operations (once out of 12 in the above example) to a short-term reverse operation. Also, in the fourth operating state, the controller 550 performs a short-term reverse operation for the engine cooling fan 540 at the same timing as the short-term reverse operation and short-term stop operation for the condenser fan 84.

[0180] In the time chart shown in FIG. 19, in the fourth operating state, the control of performing a short-time stop operation of the condenser fan 84 and performing a short-time reverse operation of the engine cooling fan 540 corresponds to the first control mode (see the A1 portion surrounded by the two-dot chain line). The first control mode is executed at each first time interval S1. In addition, in the fourth operating state, the control of performing a short-time reverse operation of both fans 84, 540 corresponds to the second control mode (see the A2 portion surrounded by the one-dot chain line). The second control mode is executed at each second time interval S2 that is longer than the first time interval S1. In the time chart shown in FIG. 19, the time t1 at which each of the first control mode and the second control mode is executed corresponds to the control mode execution time.

[0181] As described above, in the control of the condenser fan 84 and the engine cooling fan 540 by the controller 550, a control for reversing the rotation of both fans 84, 540 at the same timing every fixed time is interwoven with a control for reversing the rotation of the engine cooling fan 540 while stopping the condenser fan 84. Hereinafter, the control of both fans 84, 540 by the controller 550 to execute the first control mode at the first time interval S1 and the second control mode at the second time interval S2 as described above is referred to as "control mode execution control."

[0182] In addition, strictly speaking, in the forward / reverse rotation control of both fans 84, 540, when switching between the forward and reverse rotation states, a stop period in which the fans are stopped is inserted for a time equal to or shorter than the control mode execution time (for example, several seconds to about 10 seconds). This is to prevent the generation of counter electromotive force when the fans switch from the forward rotation state to the reverse rotation state or from the reverse rotation state to the forward rotation state. This stop period is not shown in FIG. 19.

[0183] As described above, the controller 550 that performs the control mode execution control to control the condenser fan 84 and the engine cooling fan 540 stops the control mode execution control by detecting a predetermined working state of the combine harvester 1, and resumes the control mode execution control when a condition corresponding to the end of the predetermined working state is satisfied. Such control to temporarily stop the control mode execution control when the combine harvester 1 is in a predetermined working state is referred to as "control mode stop control."

[0184] In the control mode stop control, stopping the control mode execution control results in the following operation control. First, during execution of either the first control mode or the second control mode, execution of that control mode is suspended and forward rotation control is performed. That is, both fans 84, 540 that are in a reverse rotation or stopped state due to execution of either control mode are put into a forward rotation state. Also, during standby while performing forward rotation control until the next execution of the first control mode or the second control mode, time measurement for executing the first control mode or the second control mode is suspended.

[0185] In the control mode stop control, the predetermined working state of the combine harvester 1 is a state in which the discharge auger 9 is discharging grains from the grain tank 7 to the outside. That is, as the control mode stop control, the controller 550 stops the control mode execution control while the discharge auger 9 is discharging grains, and resumes the control mode execution control after the discharge auger 9 has finished discharging grains.

[0186] The controller 550 performs control mode stop control based on the rotation state of the discharge auger 9 and the vehicle speed, which is the traveling speed of the combine 1 (traveling body 4).

[0187] 17, the combine harvester 1 has an auger stored state detection sensor 551 that detects whether the discharge auger 9 is in a stored state as a component for detecting the rotation state of the discharge auger 9. The auger stored state detection sensor 551 is connected to the controller 550, and the controller 550 receives an input of a detection signal from the auger stored state detection sensor 551.

[0188] The auger storage state detection sensor 551 is, for example, a detection switch provided at the bottom of the auger rest 27 (see FIG. 3). The auger storage state detection sensor 551 detects whether the discharge auger 9 is stored or not based on whether the discharge auger 9 is stored and supported in the auger rest 27, that is, whether the discharge auger 9 is present in the auger rest 27.

[0189] 17, the combine harvester 1 has a vehicle speed sensor 553 as a component for detecting the vehicle speed. The vehicle speed sensor 553 is connected to a controller 550. The controller 550 receives an input of a detection signal from the vehicle speed sensor 553 and detects the vehicle speed. The controller 550 controls the vehicle speed based on the detection signal from the vehicle speed sensor 553.

[0190] The combine harvester 1 has a traveling HST for changing the traveling speed as a driving unit 555 related to the vehicle speed. Here, "HST" refers to a hydraulic stepless transmission that employs a system in which hydraulic pressure generated by driving a hydraulic pump is converted again into rotational force by a hydraulic motor. The HST has a variable displacement pump and motor that are fluidly connected to each other, solenoid valves corresponding to the pump and motor, respectively, and an output shaft. In the HST, the pump is adjusted and driven (traveling drive adjustment) via the solenoid valve for the pump while receiving power from the engine 11, and the drive of the motor by the adjustment drive is transmitted to the output shaft.

[0191] The output shaft of the HST for traveling is interlocked with a transmission mechanism for transmitting driving force to the left and right crawler units 3 that constitute the traveling unit 2. This transmission mechanism is configured including a planetary gear group and has left and right output shafts that transmit driving force to the drive sprockets 3c of the left and right crawler units 3.

[0192] The controller 550 receives an input of a detection signal regarding the forward / rearward rotation operation position (operation amount) of the main speed change lever 21, generates control information based on the detection signal, and controls the drive of the drive unit 555 based on the generated control information. The operation amount of the main speed change lever 21 is detected by, for example, a rotary encoder or a rotary potentiometer. The controller 550 controls the drive of the pump and motor by controlling the solenoid valve for the HST, and controls the power transmission from the output shaft to the transmission mechanism.

[0193] In such a configuration, the vehicle speed sensor 553 detects, as the vehicle speed, for example, the rotation speed of the crawler unit 3 or the rotation speed of the output shaft of the HST for traveling. The controller 550 controls the drive unit 555 so that the vehicle speed detected by the vehicle speed sensor 553 corresponds to the manual operation of the main shift lever 21, etc.

[0194] In this configuration, the controller 550 performs control to stop the control mode based on detection signals from the auger storage state detection sensor 551 and the vehicle speed sensor 553.

[0195] When the grains in the grain tank 7 are discharged to the outside, the discharge auger 9 rotates from the stored state so that its tip is positioned to the side of the machine body. Therefore, when the controller 550 detects that the discharge auger 9 is not stored during the control mode stop control, the controller 550 stops the periodic execution of the first control mode at the first time interval S1 and the periodic execution of the second control mode at the second time interval S2, that is, the control mode execution control. The controller 550 that has stopped the control mode execution control switches the fan control to normal rotation control if any of the control modes are being executed, and stops the time measurement for executing both control modes and continues the normal rotation control if any of the control modes are waiting to be executed.

[0196] When the discharge auger 9 is discharging grains, the discharge auger 9 is not stored in the auger rest 27. The controller 550 detects a state in which the discharge auger 9 is not stored and supported in the auger rest 27 as the not-stored state of the discharge auger 9 based on a detection signal from the auger stored state detection sensor 551. Furthermore, during the grain discharge operation by the discharge auger 9, the grains discharged from the discharge port 9a are dumped into the bed of a truck, a container, or the like, so the combine harvester 1 is basically stopped (the vehicle speed is 0).

[0197] After the discharge auger 9 has finished discharging grains, the discharge auger 9 rotates toward the auger rest 27 and is stored and supported by the auger rest 27, that is, in a stored state. After the discharge auger 9 has finished discharging grains, the combine harvester 1 moves from the location where the grain discharge was performed.

[0198] Therefore, the controller 550 resumes the temporarily stopped control mode execution control under the condition that the storage state of the discharge auger 9 is detected and the traveling machine body 4 is detected during the control mode stop control. Here, resuming the control mode execution control means resuming the execution of the control mode temporarily suspended as described above, or the time measurement for the execution of the control mode in the forward rotation control state, from the point of suspension. Note that resuming the control mode execution control may also mean starting the periodic execution of the first control mode and the second control mode again from a predetermined start point T0 (see FIG. 19).

[0199] An example of a control mode stop control by the controller 550 will be described with reference to the flowchart shown in Fig. 20. Fig. 20 is a flowchart showing an example of a control mode stop control by the controller 550. The control described below is performed by the CPU of the controller 550 reading and executing a predetermined control program stored in a storage device such as a RAM.

[0200] As shown in FIG. 20, the controller 550 performs control mode stop control during control mode execution control in which each of the first control mode and the second control mode is executed at predetermined time intervals (S10).

[0201] When the combine harvester 1 is in operation, the controller 550 determines whether the discharge auger 9 is in a non-stored state based on a detection signal from the auger storage state detection sensor 551 (S20). The discharge auger 9 being in a non-stored state corresponds to a state in which the discharge auger 9 is rotating to the side of the machine body for discharging grains from the grain tank 7 to the outside, for example. When the discharge auger 9 is not in a non-stored state (S20, NO), that is, when the discharge auger 9 is in a stored state, the controller 550 continues the control mode execution control (S10).

[0202] In step S20, when the controller 550 detects that the discharge auger 9 is not in the stored state based on the detection signal from the auger stored state detection sensor 551 (S20, YES), the controller 550 stops the control mode execution control (S30). In the state in which the control mode execution control is stopped, the controller 550 drives the condenser fan 84 and the engine cooling fan 540 in the forward direction.

[0203] In a state where the control mode execution control is stopped, the controller 550 judges whether or not the discharge auger 9 is in a stored state and the vehicle speed is equal to or higher than a certain level based on the detection signals of the auger stored state detection sensor 551 and the vehicle speed sensor 553 (S40). With regard to the vehicle speed, the controller 550 judges whether or not the vehicle speed (straight vehicle speed) detected by the vehicle speed sensor 553 is equal to or higher than a predetermined speed V1 set in advance. The vehicle speed V1 is set, for example, as a speed within a range of 0.1 to 1.0 m / s.

[0204] The discharge auger 9 being in the stored state corresponds to a state in which the discharge auger 9 is not discharging grains. In addition, the vehicle speed being equal to or higher than a certain level corresponds to the traveling body 4 traveling, and corresponds to the combine 1 starting to move from the place where the discharge auger 9 performed the grain discharge operation. In other words, the discharge auger 9 being in the stored state and the vehicle speed being equal to or higher than a certain level corresponds to a state in which the discharge auger 9 has finished discharging grains.

[0205] In step S40, when the controller 550 detects that the discharge auger 9 is in the stored state and the vehicle speed is equal to or higher than a certain level (S40, YES), it releases the stop of the control mode execution control and resumes the control mode execution control (S10). Regarding the timing to resume the control mode execution control, the controller 550 may resume measuring the time from the point in time when the control mode execution control was suspended in step S30, or may reset the measurement of the time when the control mode execution control is stopped and resume the control mode execution control from a predetermined start point T0.

[0206] In step S40, the controller 550 continues to stop the control mode execution control (both fans 84, 540 are in the forward rotation state) unless it detects that the discharge auger 9 is in the stored state and the vehicle speed is equal to or higher than a certain level (S40, NO). In this way, the controller 550 resumes the control mode execution control on the condition that it detects the stored state of the discharge auger 9 and the traveling of the traveling machine body 4.

[0207] In the control mode stop control, an auger rotation position detection sensor 552 that detects the rotation position of the discharge auger 9 may be used as a configuration for detecting the rotation state of the discharge auger 9 (see FIG. 17). As shown in FIG. 17, the auger rotation position detection sensor 552 is connected to the controller 550, and the controller 550 receives an input of a detection signal from the auger rotation position detection sensor 552.

[0208] The auger rotation position detection sensor 552 detects the position in the rotation direction of the discharge auger 9, which is provided to be rotatable (swivelable) with the vertical direction as the rotation axis direction via the vertical take-out conveyor 9b. The auger rotation position detection sensor 552 is, for example, a potentiometer-type sensor, and detects the rotation position (rotation angle) of the discharge auger 9 by indirectly detecting the rotation of a part that rotates as part of the discharge auger 9 on the vertical take-out conveyor 9b via a gear or the like.

[0209] However, there is no particular limitation on the configuration of the auger rotation position detection sensor 552. The auger rotation position detection sensor 552 may be, for example, a sensor that detects an angle of vertical lifting rotation about the base of the discharge auger 9 in addition to the rotation angle of the discharge auger 9 about the vertical take-out conveyor 9b.

[0210] The controller 550 detects whether the discharge auger 9 is in the stored position or not, based on a detection signal from the auger rotation position detection sensor 552. Here, the "storage position" of the discharge auger 9 is the rotation position of the discharge auger 9 detected by the auger rotation position detection sensor 552, and is the rotation position corresponding to the stored state of the discharge auger 9. In other words, when the discharge auger 9 returns to the stored state from a state in which it has been rotated sideways, it reaches the stored position, which is a position above the auger rest 27, and then descends around its base, thereby entering a state in which it is placed on and supported by the auger rest 27, that is, the stored state.

[0211] In this way, the discharge auger 9 has a storage position for the rotation state corresponding to the storage state of the discharge auger 9. When the auger rotation position detection sensor 552 is used in the control mode stop control, the controller 550 detects that the discharge auger 9 is in the storage position as the storage state of the discharge auger 9, and detects that the discharge auger 9 is not in the storage position as the non-storage state of the discharge auger 9.

[0212] As another control mode of the control mode stop control, the controller 550 performs control to execute the first control mode or the second control mode for a predetermined time when resuming the once stopped control mode execution control. That is, when the controller 550 detects the stored state of the discharge auger 9 and the traveling of the traveling body 4 during the control mode stop control, the controller 550 performs control to execute the first control mode or the second control mode for a predetermined time before resuming the control mode execution control, regardless of the operating states of both fans 84, 540 at the time when the control mode execution control is stopped.

[0213] Another example of the control mode stop control by controller 550 will be described with reference to the flowchart shown in Fig. 21. Fig. 21 is a flowchart showing another example of the control mode stop control by controller 550. In the flowchart shown in Fig. 21, steps S10 to S40 are common to the flowchart shown in Fig. 20, and therefore description thereof will be omitted.

[0214] As shown in FIG. 21, in step S40, when the controller 550 detects that the discharge auger 9 is in a stored state and the vehicle speed is equal to or higher than a certain level (S40, YES), the controller 550 executes the first control mode or the second control mode for a predetermined time T1 (S50). In this case, the controller 550 determines that the grain discharge operation by the discharge auger 9 has been completed, and executes, as fan control before returning to the control mode execution control, the first control mode in which the condenser fan 84 is stopped and the engine cooling fan 540 is rotated in reverse, or the second control mode in which both fans 84, 540 are rotated in reverse at the same timing, for the predetermined time T1. The predetermined time T1 is set to, for example, about 10 to 30 seconds. The predetermined time T1 may be set to the same length as the control mode execution time t1.

[0215] Thereafter, controller 550 releases the stop of the control mode execution control and resumes the control mode execution control (S10). In this way, when resuming the temporarily stopped control mode execution control, condenser fan 84 may be stopped and only engine cooling fan 540 may be reversed for a short time (first control mode), or both fans 84, 540 may be reversed simultaneously for a short time (second control mode).

[0216] According to the combine harvester 1 having the above-described configuration, dust adhering to the dustproof net 503b, etc. can be removed, and the deterioration of the cooling function of the air conditioning unit 80 can be suppressed, so that the cooling effect of the air conditioning unit 80 can be stably obtained.

[0217] The combine 1 has a first control mode as a control mode for the condenser fan 84 and the engine cooling fan 540 by the controller 550, in which the condenser fan 84 is stopped and the engine cooling fan 540 is rotated in reverse.

[0218] According to such a configuration, for example, by reversing the rotation of both fans 84, 540 at the same time, air heated by a heat source such as an exhaust gas purification device 330 disposed at the rear of the cabin 30 is drawn in by the condenser fan 84. This can cause a decrease in the cooling function of the air conditioner 80. Therefore, by using the first control mode to reverse the rotation of the engine cooling fan 540 and stop the condenser fan 84, it is possible to prevent the condenser fan 84 from drawing in heated air, and thus to prevent a decrease in the performance of the air conditioner.

[0219] In addition to the first control mode, the combine 1 has a second control mode in which the condenser fan 84 and the engine cooling fan 540 are controlled by the controller 550, in which both fans 84, 540 are rotated in the reverse directions simultaneously.

[0220] According to this configuration, the second control mode can prevent dust, dirt, straw, and other such particles from adhering to the filter body such as the dustproof net 503b. As the condenser fan 84 and the engine cooling fan 540 continue to rotate in the forward direction, the dust adhering to the dustproof net 503b and other such particles accumulates, causing a decrease in the wind speed of both fans 84, 540. If the wind speed decreases, the cooling of the condenser 83 becomes insufficient, causing a decrease in the cooling performance of the air conditioner 80 or a decrease in the cooling performance of the intercooler 500.

[0221] Therefore, by reversing both fans 84, 540 at the same time in the second control mode, dust attached to the dustproof net 503b and the like can be blown away. In particular, by reversing both fans 84, 540 at the same time, the dust attached to the dustproof net 16b of the outside air introduction cover 15 and the dustproof net 503b can be efficiently blown away and removed by the synergistic action of the exhaust air from the outside air intake 110 by the condenser fan 84 (see arrow C4 in FIG. 11) and the exhaust air from the intercooler 500 to the outside of the aircraft by the engine cooling fan 540 (see arrow D2 in FIG. 11). This makes it possible to suppress a decrease in the cooling performance of the air conditioner 80 and the intercooler 500. In addition, the removal of dust attached to the dustproof net 16b of the outside air introduction cover 15 and the dustproof net 503b also leads to suppression of overheating of the engine 11.

[0222] In this way, by controlling the operation of both fans 84, 540 by the controller 550, it is possible to efficiently remove dust adhering to the dustproof net 503b etc., and to maintain the cooling effect of the air conditioner.

[0223] Furthermore, the frequency of the first control mode is set higher than the frequency of the second control mode in the operational control of both fans 84, 540. With this configuration, it is possible to reduce the frequency with which condenser fan 84 rotates in the reverse direction together with engine cooling fan 540, and to effectively prevent the performance of the air conditioner from deteriorating.

[0224] Furthermore, the controller 550 performs control mode stop control to temporarily stop the control mode execution control during grain discharge work by the discharge auger 9 and drive both fans 84, 540 in the forward direction. With this configuration, during grain discharge work work by the discharge auger 9, it is possible to prevent dust blown off the dustproof net 503b etc. and hot air blown out from the dustproof net 503b etc. from falling on workers around the combine 1 (particularly on the right side).

[0225] Furthermore, since the state after the grain discharge operation by the discharge auger 9 can be reliably detected based on the storage state of the discharge auger 9 and the vehicle speed, the control mode execution control can be temporarily stopped automatically in response to the start and end of the grain discharge operation by the discharge auger 9. This makes it possible to efficiently obtain the effects of the first control mode and the second control mode when the grain discharge operation is performed by the discharge auger 9.

[0226] In addition, in the control mode stop control, the controller 550 performs control to execute the first control mode or the second control mode for a short time when the control mode execution control is resumed. With this configuration, at the timing when the grain discharge work by the discharge auger 9, which is likely to cause dust to adhere to the dustproof net 16b of the outside air introduction cover 15 and the dustproof net 503b, is completed, the dust attached to the dustproof net 503b and the like can be blown away, and the dust can be efficiently removed. This makes it possible to effectively suppress the deterioration of the cooling performance of the air conditioner 80 and the intercooler 500. In particular, by executing the first control mode, the condenser fan 84 is stopped and only the engine cooling fan 540 is reversed, so that it is possible to suppress the hot air behind the cabin 30 from being sucked in by the condenser fan 84 which is reversed, and it is possible to suppress the deterioration of the cooling performance of the air conditioner 80.

[0227] Next, the fan control performed in the third operating state will be described. As described above, in the third operating state, the air conditioner is stopped, so the condenser fan 84 is basically stopped (see Figs. 18 and 19), but since the engine 11 is running, it is desirable to periodically rotate both fans 84, 540 in the reverse direction in order to remove dust accumulated on the dustproof net 503b, etc.

[0228] 19, in the third operating state, the controller 550 performs the same control as in the fourth operating state for the engine cooling fan 540, while the condenser fan 84 is basically in a stopped state, and performs a short-time reverse rotation operation in addition to a reverse rotation operation once every several times (once every 12 times in the above example) among the short-time stop / reverse rotation operations performed for the engine cooling fan 540 every certain time. That is, in the third operating state, the air conditioner is stopped, but control is performed to perform a short-time reverse rotation operation for both fans 84, 540 at the same timing every certain time (every 60 minutes in the above example) as in the second control mode in the fourth operating state (see the A3 portion surrounded by a dashed line). In the example shown in FIG. 19, the time for which both fans 84, 540 are reversed is the same length (time t1) as the length of the control mode execution time.

[0229] In this way, when the air conditioner is stopped as in the third operating state, the controller 550 basically (usually) stops the condenser fan 84, reverses the engine cooling fan 540 at every first time interval U1, and simultaneously reverses the condenser fan 84 and the engine cooling fan 540 at every second time interval U2 that is longer than the first time interval U1. In the example shown in FIG. 19, the first time interval U1 is the same length (e.g., 5 minutes) as the first time interval S1 in the control mode execution control, and the second time interval U2 is the same length (e.g., 60 minutes) as the second time interval S2 in the same control. However, the lengths of these time intervals are not limited.

[0230] According to the above-described fan control configuration, even when the air conditioner is stopped, both fans 84, 540 are periodically operated in reverse at the same time, thereby making it possible to more efficiently remove dust adhering to dustproof net 503b, etc., compared to the case where only engine cooling fan 540 is periodically rotated in reverse.

[0231] The above-described embodiment is an example of the present invention, and the present invention is not limited to the above-described embodiment. Therefore, even if it is not the above-described embodiment, various modifications are possible according to the design, etc., as long as they do not deviate from the technical idea of ​​the present invention. In addition, the effects described in this disclosure are merely examples and are not limited, and other effects may be present. [Explanation of symbols]

[0232] 1. Combine Harvester 4 Running body 7 Grain Tank 9. Discharge auger (grain discharge device) 11 Engine 12 Driving section 30 Cabin 32 Rear wall 80 Air conditioner 84 Condenser fan (cooling fan for air conditioner) 330 Exhaust gas purification equipment (exhaust equipment) 500 Intercooler (cooling device) 540 Engine cooling fan (cooling fan for cooling system) 550 Controller 551 Auger storage state detection sensor 552 Auger storage state detection sensor 553 Vehicle speed sensor

Claims

1. A cooling fan for an air conditioner provided on a rear wall of a cabin covering a driver's section; A cooling device for cooling air supplied to an engine provided on the traveling body, the cooling device having a cooling fan for the cooling device and provided on a lateral side of the traveling body so as to merge the cooling air from the cooling fan for the cooling device with the cooling air from the cooling fan for the air conditioning device; a controller that controls rotation of the air conditioner cooling fan and the cooling device cooling fan, The cooling fan for the cooling device is configured to be capable of rotating in a reverse direction with a rotation direction for blowing cooling air as a forward rotation direction, The controller has a first control mode for stopping the air conditioner cooling fan and reversing the rotation of the cooling fan for the cooling device as a control mode for the air conditioner cooling fan and the cooling device cooling fan. combine.

2. The cooling fan for the air conditioner is configured to be capable of rotating in a reverse direction with a rotation direction for blowing cooling air as a forward rotation direction, The controller has, as one of the control modes, a second control mode in which the air conditioner cooling fan and the cooling device cooling fan are simultaneously rotated in reverse. The combine according to claim 1.

3. The controller executes the first control mode every first time interval and executes the second control mode every second time interval that is longer than the first time interval. The combine harvester according to claim 2.

4. A grain tank provided on the traveling body; A grain discharge device is provided rotatably with respect to the traveling machine body and discharges the grains in the grain tank to the outside, When the controller detects a non-storage state of the grain discharge device, the controller stops the periodic execution of the first control mode at the first time interval and the periodic execution of the second control mode at the second time interval, and resumes the periodic execution of the first control mode and the second control mode on the condition that the controller detects a storage state of the grain discharge device and detects the traveling of the traveling machine body. The combine according to claim 3.

5. The controller detects the storage state of the grain discharge device and, when detecting the traveling of the traveling machine body, executes the first control mode or the second control mode for a predetermined time. The combine according to claim 4.

6. an air conditioning device having an air conditioning cooling fan provided in a rear wall of a cabin covering a driver's section, the air conditioning device conditioning the interior of the cabin; A cooling device for cooling air supplied to an engine provided on the traveling body, the cooling device having a cooling fan for the cooling device and provided on a lateral side of the traveling body so as to merge the cooling air from the cooling fan for the cooling device with the cooling air from the cooling fan for the air conditioning device; a controller that controls rotation of the air conditioner cooling fan and the cooling device cooling fan, The air conditioner cooling fan and the cooling device cooling fan are configured to be rotatable in a reverse direction with a rotation direction for blowing cooling air as a forward rotation direction, When the air conditioner is stopped, the controller basically stops the air conditioner cooling fan, reverses the rotation of the cooling fan for the cooling device at every first time interval, and simultaneously reverses the rotation of the air conditioner cooling fan and the cooling device cooling fan at every second time interval that is longer than the first time interval. combine.

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