CN115534662A

CN115534662A - Combine harvester

Info

Publication number: CN115534662A
Application number: CN202210748293.6A
Authority: CN
Inventors: 笹浦宽之
Original assignee: Yanmar Holdings Co Ltd
Current assignee: Yanmar Holdings Co Ltd
Priority date: 2021-06-30
Filing date: 2022-06-29
Publication date: 2022-12-30
Also published as: KR20230004244A; JP2023006628A

Abstract

The invention aims to improve the cooling function of a cooling device for cooling air supplied to an engine and to make a machine body compact in a combine harvester. The present invention is a combine harvester having a cab (30) covering a cab, and the combine harvester is provided with: a condenser unit (81) of an air conditioner (80) which is provided on the rear wall portion of the cab (30) and which includes a condenser (83) and a condenser fan (84); and a cooling device as an intercooler (500) having a cooling device fan (540) for cooling air supplied to an engine provided in the traveling machine body, wherein the intercooler (500) is provided on the side of the traveling machine body so that cooling air by the cooling device fan (540) and cooling air by the condenser fan (84) are merged.

Description

Combine harvester

Technical Field

The present invention relates to a combine harvester including a cooling device for cooling air supplied to an engine.

Background

Some combine harvesters include an internal cooler serving as a cooling device for cooling air supplied to an engine. Patent document 1 discloses the following arrangement of the intercooler.

That is, an intercooler is disposed on the right side of the engine, and an intercooler fan is disposed between the intercooler and the engine. A radiator is disposed on the front right side of the engine, and a radiator fan is disposed on the left side of the radiator. Further, a dust exhaust fan for blowing air from the left and right inner sides of the body to the outside is provided between the radiator and the radiator cover.

The respective right and left outer sides (right sides) of the intercooler and the radiator are covered with an engine cover and a radiator cover having a filter, which are ventilation portions for taking in outside air, and the two covers are disposed adjacent to each other in the front-rear direction so as to form a right side surface portion of the engine body.

Further, there is disclosed a configuration in which the fan for the intercooler and the dust exhaust fan are reversed as the radiator fan stops rotating in order to prevent the straw waste or the like removed from the filter of the radiator cover from adhering to the filter of the inner cooler cover and to increase the heat exchange rate of the inner cooler.

According to the cab structure disclosed in patent document 1, the intercooler and the radiator are disposed adjacent to each other in the front-rear direction when viewed from the right side surface, and therefore there is a problem that the cover structure covering the intercooler and the radiator is likely to be large in size, and the body is difficult to be small in size.

Patent document 1: japanese laid-open patent publication No. 2012-006526

Disclosure of Invention

The invention aims to provide a combine harvester which can improve the cooling effect of a cooling device for cooling air supplied to an engine and can make a machine body compact.

The present invention relates to a combine harvester having a cab covering a cab, and the combine harvester includes: a condenser unit of an air conditioner, which is provided on a rear wall portion of the cab, and includes a condenser and a condenser fan; and a cooling device having a cooling device fan for cooling air supplied to an engine provided in a traveling machine body, the cooling device being provided on a side of the traveling machine body so that cooling air by the cooling device fan and cooling air by the condenser fan are merged.

A combine according to another aspect of the present invention includes: in the above combine harvester, an outside air intake port for taking in outside air to the condenser is provided at a position laterally aligned with respect to the cooling device as viewed from a side surface of the travel machine body.

A combine according to another aspect of the present invention includes: in the above-described combine harvester, the grain tank is provided on the travel machine body, and the cooling device is disposed between the cab and the grain tank.

A combine according to another aspect of the present invention is configured such that: the combine harvester described above is provided with a controller that controls rotation of the condenser fan and the cooling device fan, the condenser fan and the cooling device fan being configured to be capable of rotating in a forward direction and a reverse direction, respectively, with respect to a rotational direction in which cooling air is sent, and the controller controlling the condenser fan and the cooling device fan to rotate in the same rotational direction at the same time point.

A combine according to another aspect of the present invention includes: the combine harvester includes: a grain box provided on the travel machine body; and a grain discharging device which is provided to be rotatable with respect to the travel machine body and discharges grains in the grain tank to the outside, wherein the controller controls a time point at which the fan for the condenser and the fan for the cooling device are reversed based on a rotation state of the grain discharging device.

A combine according to another aspect of the present invention is configured such that: in the above combine harvester, the grain discharging device has a storage position corresponding to a storage state of the grain discharging device with respect to a rotational state, and the controller reverses the condenser fan and the cooling device fan for a predetermined time period when detecting that the grain discharging device has reached the storage position.

According to the present invention, the cooling effect of the cooling device for cooling the air supplied to the engine can be improved, and the body can be made compact.

Drawings

Fig. 1 is a left side view of a combine harvester according to an embodiment of the present invention.

Fig. 2 is a right side view of a combine harvester according to an embodiment of the present invention.

Fig. 3 is a plan view of a combine harvester according to an embodiment of the present invention.

Fig. 4 is a right side view showing the cab and the outside air introducing cover according to the embodiment of the present invention.

Fig. 5 is a left side view of the cab according to the embodiment of the present invention.

Fig. 6 is a right side view of the cab according to the embodiment of the present invention.

Fig. 7 is a rear view of the cab according to the embodiment of the present invention.

Fig. 8 is a rear right perspective view of the cab according to the embodiment of the present invention.

Fig. 9 is a right side sectional view of the cab according to the embodiment of the present invention.

Fig. 10 is a plan view schematically showing the inside of a roof portion of a cab according to an embodiment of the present invention.

Fig. 11 is a schematic diagram showing an arrangement structure of a condenser unit, a structure of an air conditioning unit, and an arrangement structure of an intercooler according to an embodiment of the present invention.

Fig. 12 is a right rear perspective view showing a structure of a device mounted on a front portion of a travel machine body according to an embodiment of the present invention.

Fig. 13 is a front left perspective view showing a configuration of a device mounted on a front portion of a travel machine body according to an embodiment of the present invention.

Fig. 14 is a right side view showing a configuration of a device mounted on a front portion of a travel machine body according to an embodiment of the present invention.

Fig. 15 is a rear perspective view showing the structure of the support frame and the connection frame according to the embodiment of the present invention.

Fig. 16 is a left side view showing a support structure of an intercooler according to an embodiment of the present invention.

Fig. 17 is a partially enlarged perspective view showing a support structure of an intercooler according to an embodiment of the present invention.

Fig. 18 is a block diagram showing a control configuration of a cooling fan for a condenser and a fan for a cooling device according to an embodiment of the present invention.

Fig. 19 is a flowchart showing an example of a control mode of the cooling fan for the condenser and the fan for the cooling device according to the embodiment of the present invention.

Description of the reference numerals

1\8230acombine harvester; 4\8230adriving body; 7 \ 8230and grain box; 9 \ 8230; discharge screw conveyor (grain discharge device); 11 \ 8230and engine; 12\8230adriving part; 14, 8230and radiator; 15 \ 8230and an external air introducing cover; 30\8230acab; 32 \ 8230and a rear wall part; 80, 8230and air conditioner; 81\8230acondenser unit; 82 \ 8230and air conditioning unit; 83 \ 8230and a condenser; 84 \ 8230and a fan for a condenser; 110, 8230, an external air inlet; 111 8230a space part for external air circulation; 330 \ 8230and waste gas purifying device; 500 \ 8230a cooler (cooling device) inside; 501 \ 8230and a shell; 540 \ 8230, a fan for a cooling device; 550 \ 8230and a controller; 600, 8230and a cooling air converging part.

Detailed Description

The present invention is intended to improve the cooling effect of a cooling device and to reduce the size of a machine body by studying the arrangement of the cooling device (an internal cooler) for cooling air supplied to an engine in relation to a condenser unit provided in a rear wall portion of a cab in a combine harvester having the cab covering an operator's cab. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the overall configuration of the combine harvester 1 according to the present embodiment will be described with reference to fig. 1 to 4. In the following description, the left and right sides facing the front of the combine harvester 1 are referred to as the left and right sides of the combine harvester 1, respectively.

As shown in fig. 1 to 3, the combine harvester 1 includes: a traveling unit 2 configured as a crawler type traveling device having a pair of left and

right crawler portions

3 and 3; and a traveling machine body 4 supported by the traveling unit 2. The combine harvester 1 includes: a harvesting part 5, a threshing part 6, a grain box 7, a screening part 8, a discharge screw conveyor 9 and a straw treatment part 10.

Each crawler belt portion 3 constituting the traveling portion 2 includes: a track frame 3a that is disposed so as to extend in the front-rear direction below the travel machine body 4; various rotary bodies supported by the track frame 3a; and a crawler belt 3b wound around these rotary bodies. The crawler portion 3 includes, as a rotating body supported by the track frame 3a, a drive sprocket 3c supported by a tip end portion of the track frame 3a, and the like. The track portion 3 is driven by transmission of power of an engine 11 as a driving source mounted on the traveling machine body 4 through a drive sprocket 3 c.

The harvesting unit 5 is a device structure for harvesting grain stalks in the field while harvesting them, and is provided at the front of the traveling machine body 4. The harvesting unit 5 is provided on the front side of the traveling machine body 4 so as to extend over the entire width of the combine harvester 1. The harvesting unit 5 is mounted on the traveling machine body 4 so as to be rotatable about a predetermined axis via a hydraulic cylinder for elevation, and is provided so as to be adjustable in elevation by a rotational operation by a telescopic operation of the hydraulic cylinder.

The harvesting unit 5 includes a harvesting support machine frame 5a as a harvesting frame, and the harvesting support machine frame 5a supports the straw separating body 5b, the pulling-up device 5c, the cutter device 5e, and the straw conveying device 5f. The harvesting unit 5 sorts the grain stalks in the field by the grain dividing body 5b, pulls the sorted grain stalks by the pulling-up device 5c, and cuts and harvests the grain stalks by the cutter device 5e while conveying the pulled-up grain stalks to the rear side by the grain stalk conveying device 5f. Each device included in the harvesting unit 5 operates by power transmission from an engine 11 included in the combine harvester 1.

The traveling machine body 4 is provided with: a threshing part 6 for threshing the grain stalks harvested by the harvesting part 5; and a grain box 7 as a grain storage unit for storing the grains taken out from the threshing unit 6. The threshing part 6 is arranged on the left side of the machine body, and the grain box 7 is arranged on the right side of the machine body.

The threshing part 6 has: a threshing cylinder 6a and a treatment cylinder (not shown) which have a front-rear direction as a rotation axis direction; and a grain and straw supply device provided on the left of the threshing cylinder 6 a. The grain and straw supply device clamps the roots of the grain and straw and conveys the grain and straw backward in a horizontal posture with the spike tip at the threshing cylinder 6a side. The straw feeding device comprises: a feed chain wound around a plurality of sprockets having a left-right direction as a rotation axis direction; and a straw feeding clamp control body (not shown) which clamps and controls the root of the straw in cooperation with the feeding chain.

A screening unit 8 for screening the processed object threshed by the threshing unit 6 is provided below the threshing unit 6 on the travel machine body 4. The screening section 8 includes an oscillating screening device 8a, and an air screening device and a grain conveyor, not shown. The screening unit 8 performs the swing screening of the processed object dropped from the threshing unit 6 by the swing screening device 8a, and performs the wind screening of the processed object after the swing screening by the wind screening device. The screening unit 8 blows the grains in the screened processed material toward the right direction of the grain tank 7 by the grain conveyor, thereby raising the straw chips, dust, and the like toward the rear by the wind screening device and discharging the same to the outside of the machine body. The grains transported by the grain transporting device toward the grain tank 7 are stored in the grain tank 7.

A discharge auger 9 for discharging grain from the grain tank 7 to the outside is rotatably provided at a right rear end portion of the traveling machine body 4 via a vertical discharge conveyor 9b provided at a right rear side of the traveling machine body 4. The discharge auger 9 is provided to be vertically movable and rotatable around the base thereof.

The discharge auger 9 is in a storage state in which it extends horizontally from the vertical take-out conveyor 9b on the right rear side of the travel machine body 4 to the left front side. The discharge auger 9 extends in the stored state to a portion where the tip end portion is positioned on the left side of the reaping portion 5 in a plan view and along a diagonal line of the machine body (see fig. 3). The discharge screw 9 is supported by a screw retaining frame 27 as a screw receiving portion by a loading device and is in a storage state.

The screw conveyor holding frame 27 is provided on the left side of the rear portion of the cab 30 in a state of being supported by a predetermined support member. The auger holding frame 27 has a concave shape with an open upper side, and supports a predetermined portion of the middle portion of the discharge auger 9 in the extending direction from the lower side so as to store and support the cylindrical discharge auger 9 in a positioned state.

The grains stored in the grain tank 7 are conveyed by a discharge screw conveyor 9 incorporating a screw conveyor, and discharged from a discharge port 9a provided at the tip end of the discharge screw conveyor 9. The grains discharged from the discharge port 9a are thrown into a container of a truck, a container, or the like.

In this way, the combine harvester 1 includes: a grain tank 7 provided on the travel machine body 4; and a discharge auger 9 as a grain discharge device provided to be rotatable with respect to the travel machine body 4 for discharging grains in the grain tank 7 to the outside.

On the other hand, a straw treatment section 10 for treating straw after threshing processing by the threshing section 6 is provided behind the threshing section 6 on the travel machine body 4. The straw treatment section 10 includes a straw conveyance device 10a and a straw cutting device 10b. The straw conveying device 10a conveys the threshed grain straws (waste straws) to the rear through the threshing part 6 and discharges the grain straws to the outside of the machine body or conveys the grain straws to the straw cutting device 10b. The straw cutting device 10b cuts the waste straw conveyed from the straw conveying device 10a and discharges the waste straw to the outside of the machine body.

Further, in the traveling machine body 4, a cab 12 covered with a cab 30 is provided to the right of the reaping portion 5 and in front of the grain tank 7. That is, the cab 12 is provided in the cab 30 above the front portion of the travel machine body 4. As shown in fig. 9, a handle 18 as a steering operation portion is provided at the front of the driver portion 12, and a driver seat 19 is provided behind the handle 18. Further, a side operation portion 20 in which various operation tools such as a main shift lever 21 and a sub shift lever 22 are disposed on a side pillar 23 is provided on the left side of the operator's seat 19.

A prime mover unit including an engine 11 disposed in an engine room 13 is provided behind and below the driver unit 12. The power of the engine 11 is transmitted to various devices of each part of the combine harvester 1, such as the traveling part 2, the harvesting part 5, the threshing part 6, the screening part 8, the discharge screw conveyor 9, and the straw treatment part 10, via a transmission device and the like. The engine 11 is a diesel engine.

In the engine room 13, a radiator 14 (see fig. 3) is disposed on the right side of the engine 11. The radiator 14 is provided in the middle of a circulation path of the coolant of the engine 11, and cools the coolant sent from the engine 11 by heat exchange with outside air. The cooling water cooled by the radiator 14 is returned to the engine 11. The heat sink 14 has a rectangular plate-like outer shape and is erected with the left-right direction as the direction of the thickness direction.

The travel machine body 4 includes a horizontal base portion 25 formed of a frame member, a plate member, or the like that is placed in the front-rear direction or the left-right direction on the track frame 3 a. The rear side of the pedestal portion 25 projects rearward from the rear end of the crawler belt portion 3 in the front-rear direction.

The seat unit 25 is provided with an engine 11, a threshing unit 6, and a grain tank 7. The engine 11 is mounted on the front portion of the base portion 25 at a position closer to the right side with the axial direction of the output shaft facing in the left-right direction. That is, the engine 11 is disposed on the right side of the front portion of the traveling machine body 4. The threshing part 6 and the grain tank 7 are provided at a part of the seat part 25 on the rear side of the engine 11. A transmission case 26 (see fig. 13) is disposed between the left and right crawler portions 3 on the front side of the seat portion 25. The power of the engine 11 is transmitted to the left and right track portions 3 via the transmission case 26.

As shown in fig. 2 and 4, an outside air introduction cover 15, which is an engine cover covering the right side of the engine room 13, is provided on the right side of the engine 11. A radiator 14 is positioned inside the outside air introduction cover 15. That is, the radiator 14 is disposed between the engine 11 and the outside air introducing cover 15. The outside air taken in from the outside air introducing cover 15 is used for heat exchange in the radiator 14.

The outside air introduction cover 15 is provided between the cab 30 and the grain tank 7 on the right side of the combine harvester 1. The outside air introducing hood 15 is provided in the same plane as the right side surface portion of the grain box 7.

The rear edge portion of the outside air introduction cover 15 is formed linearly so as to extend along the vertical direction when viewed from the side. The outside air introduction cover 15 is supported via a hinge portion, not shown, so as to be rotatable in a vertical direction as a rotation axis direction with respect to a support column, not shown, provided upright on the travel machine body 4 along a rear edge portion thereof. The outside air introducing cover 15 is provided so as to be openable and closable from the front side by a pivot support portion on the rear side with respect to the stay.

In a state where the outside air introduction cover 15 is closed, the right side of the engine 11 and the radiator 14, which is the outside of the machine, is covered with the outside air introduction cover 15, and the engine room 13 is closed from the right side. By opening the outside air introduction cover 15, the right side of the engine room 13 is opened.

The outside air introduction hood 15 is provided with a rotary screen 16. The rotary screen 16 is configured to take outside air into the engine room 13 as cooling air for cooling the engine 11. The rotary screen 16 is constituted by: the outside air introducing cover 15 is rotatably supported by a rotation support portion located at the center of a circular opening 16a formed in the outside air introducing cover, and is rotated by driving of a motor not shown.

The rotary screen 16 has a structure in which a mesh-like dust screen 16b is stretched over a circular opening 16 a. The dust screen 16b collects dust, dirt, straw, and the like, and prevents the dust and the like from entering the engine compartment 13 together with the outside air. The dust and the like collected by the dust screen 16b are removed by a suction device 17 provided outside the rotary screen 16. The suction device 17 is configured to suck and discharge the dust and the like adhering to the dust-proof net 16b to the outside of the machine.

Further, an upper cover portion 24 is provided above the outside air introducing cover 15. The upper cover 24 is a plate-shaped cover portion, and is provided as a right side surface portion that is flush with the outside air introduction cover 15. The upper cover portion 24 is provided in a fixed state with respect to a predetermined frame portion or the like.

As described above, the combine harvester 1 includes: a cab 30 covering the cab 12; an engine 11 disposed on the lower rear side of the cab 30; and an outside air introducing cover 15 disposed on a side of the engine 11.

The structure of cab 30 will be described with reference to fig. 4 to 9. The cab 30 includes a front surface 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 roof portion, and a floor portion 36, and is configured to have a substantially box shape as a whole.

The front surface 31 of the cab 30 has a front upper surface portion 31a of a forward-inclined shape constituting a majority of an upper side thereof, and a front lower surface portion 31b of a low-front and high-rear inclined shape constituting a substantially lower half of the front surface portion 31, and has a curved shape that is concave rearward as viewed from the side as a whole. The front upper surface portion 31a is formed as a window portion which is transparent as a whole 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.

The left side wall 33 of the cab 30 is a portion forming a left side surface portion of the cab 30, and a lower portion is a lower side surface portion 41 (see fig. 5) which is a portion made of a metal plate made of a steel plate or the like. The left side wall portion 33 is provided with a straight left pillar portion 42 located at an intermediate portion in the front-rear direction of the left side wall portion 33 and extending in the up-down direction, above the lower side surface portion 41.

A rectangular left rear window portion 43 is provided on the rear side of the left pillar portion 42 in the left side wall portion 33. The left rear window 43 is formed by attaching a transparent plate 45 such as rectangular glass to a frame-shaped sash 44 having a front side portion of the left pillar 42, at a portion above the lower side surface portion 41. The left side wall portion 33 is provided with a left front window portion 47 on the front side of the left pillar portion 42. The left front window 47 has a substantially inverted trapezoidal shape, and the front side edge portion is inclined along the front upper surface portion 31a of the front surface portion 31 in a forward inclination.

The right side wall portion 34 of the cab 30 has a right front pillar portion 49 erected on the front portion of the right side wall portion 34, and a right rear pillar portion 50 erected on the rear portion of the right side wall portion 34. The right front pillar portion 49 extends the upper portion 49b in the vertical direction with the lower portion 49a inclined when viewed along the side surface of the front lower portion 31b of the front portion 31. The right front pillar portion 49 stands upright at a position right front of the floor portion 36, and is provided over substantially the entire right side wall portion 34 in the vertical direction.

The right rear pillar portion 50 is provided so as to be parallel to an upper portion 49b of the right front pillar portion 49 extending in the vertical direction at substantially the same height position. The right rear pillar portion 50 is erected at a position of a front-rear intermediate portion of the right edge portion of the rear wall portion 32 that is provided in an inclined shape that is low in front and high in rear when viewed from the side. A door 51, which is an opening/closing door for opening and closing most of the right side wall portion 34, is provided between the right front pillar portion 49 and the right rear pillar portion 50.

The door 51 is supported by a support portion 52 provided at the upper and lower sides 2 with respect to the right rear pillar portion 50 so as to be rotatable in the vertical direction as a rotation axis direction. The door 51 is opened from the closed state to the front side to the outside so that the operator can get in and out of the cab 30.

The upper portion of the door 51 is a window portion 56 that can be opened and closed. Substantially the entire lower portion of the door 51 is formed of a transparent plate 57 such as glass. The door 51 has a shape with a bottom portion with a front side slope along the lower portion 49a of the right front pillar portion 49 as viewed laterally and a root portion with a rear side slope along the lower front portion 32 as viewed laterally. A handle 58 is provided at a front portion of a lower portion of the door 51.

As described above, in the present embodiment, the right side wall portion 34 is a side wall portion of the cab 30 where the door 51 for the entrance and the exit of the cab 30 is provided. The right side wall portion 34 is a side wall portion on the side where the outside air introduction cover 15 is located, of the left and right side wall portions of the cab 30.

Further, a right front window portion 59 is provided on the right side wall portion 34 on the front side of the upper portion of the door 51. The right front window 59 has a substantially inverted triangular shape, and the front side edge portion is inclined along the front inclination of the front upper surface 31a of the front surface 31.

The roof portion 35 of the cab 30 is formed in a substantially rectangular shape whose longitudinal direction is the front-rear direction in a plan view. The roof portion 35 has a front edge portion projecting forward from the upper end of the front surface portion 31 in a visor shape, and a rear edge portion projecting rearward from the upper end of the rear wall portion 32 in a visor shape.

The floor portion 36 of the cab 30 has a horizontal floor portion 63 (see fig. 9) formed in a front lower portion of the operator's seat 19. A substantially horizontal seat support surface portion 65 is provided on the rear side of the floor surface portion 63 via a low-front high-rear inclined surface portion 64. The driver seat 19 is provided on the seat support surface portion 65.

In the combine harvester 1 having the above-described configuration, the outside air introduction cover 15 provided to form a part of the right side surface portion of the combine harvester 1 at a position rearward of the cab 30 is provided in a form in which the front portion is butted against the cab 30 in an inclined manner from the rear side when viewed from the side. That is, in a right side view, the outside air introduction cover 15 and the cab 30 have portions that overlap each other in the vertical direction so as to form a boundary line A1 (see fig. 4) that is inclined so as to be low in the front and high in the rear.

The rear wall portion 32 of the cab 30 has a rearward inclined shape when viewed from the side. That is, the rear wall portion 32 is formed in a backward inclined shape as a whole in a side view with an inclined surface portion that is low in front and high in back (high in back and low in front) from the lower side toward the upper side from the front side to the back side. As shown in fig. 9, the rear wall portion 32 is erected diagonally rearward and upward from the rear side of the seat support surface portion 65, and an upper end portion connected to the roof portion 35 is positioned in the vicinity of the rear end portion of the roof portion 35.

Further, the right side wall portion 34 of the cab 30 having the door 51 is formed with a receding shape in the backside thereof as viewed from the side. In the present embodiment, the right side wall portion 34 has a back flank shape such that an upper end thereof is located in the vicinity of a rear edge portion of the roof portion 35 of the cab 30 when viewed from the side.

As shown in fig. 6, in the door 51 forming most of the right side wall portion 34, the bottom backside portion 51b formed by the transparent plate 57 may be inclined along a straight line inclined at a lower front side and a higher rear side when viewed from the side. Further, the rear edge portion of the right side wall portion 34 is formed to be inclined such that the retaining portion 51b of the door 51 extends upward in side view.

The rear wall portion 32 of the cab 30 is formed in a rearwardly inclined shape when viewed from the side, with respect to the right side wall portion 34 in which the rear side seating portion is in a rearwardly inclined shape as described above, along the side of the rearward portion of the right side wall portion 34. That is, the rear wall 32 is formed along the rear end of the right side wall 34.

The outside air introduction cover 15 is disposed such that a front portion is positioned below the rear wall portion 32 when viewed from the side. That is, in a right side view, the front portion of the outside air introducing cover 15 located on the lower side with respect to the cab 30 and the rear portion of the cab 30 overlap each other.

The outside air introducing cover 15 has an inclined side portion 15a forming an upper portion of a front side, and is provided in a state where the inclined side portion 15a abuts against a rear side of the right side wall portion 34 of the cab 30 from a rear side in a right side view, and a boundary portion 67 (see fig. 4) along a boundary line A1 is formed between the operator's cab 30 and the inclined side portion. The outside air introducing cover 15 is disposed along the inclined side portion 15a and the rear wall portion 32 when viewed from the side.

In the right side wall portion 34 of the cab 30, a transmission window 70 is provided in a portion forming an upper portion of the rear edge portion in a rearwardly inclined shape. The transmission window 70 is configured to have a triangular window with a lower side as a vertex side, and the right side wall portion 34 is provided to occupy substantially the entire portion on the rear side of the right rear pillar portion 50.

As shown in fig. 11, cab 30 includes air conditioner 80 that performs cooling and heating operations in the interior of cab 30. Air conditioner 80 is operated by an air conditioning operation unit provided in cab 12. The air-conditioning operation portion includes, for example, a switch for turning on/off the air-conditioning device 80, a dial for adjusting the set temperature, and the like.

The air conditioner 80 includes a condenser unit 81, which is a so-called outdoor unit, and an air conditioner unit 82, which is a so-called indoor unit. The condenser unit 81 is provided in the rear wall portion 32 that becomes the back surface side of the cab 30. The air conditioning unit 82 is disposed in the roof portion 35 of the cab 30.

The condenser unit 81 has: a condenser 83; and a cooling fan, i.e., a condenser fan 84, which supplies air for heat exchange to the condenser 83. The condenser 83 is configured to include, for example, a tube for common refrigerant flow arranged in a multi-turn shape.

As shown in fig. 11, the condenser fan 84 is an electric fan including a fan main body 85 and an electric fan motor 86 as a drive source for driving the fan main body 85. A drive shaft of the fan motor 86 is coupled to a rotation shaft of the fan main body 85. The condenser fan 84 is configured to: the fan main body 85 can be rotated in either the normal rotation direction or the reverse rotation direction by the driving force of the fan motor 86.

The condenser unit 81 is configured to have a roughly square thick plate-like outer shape, and is disposed vertically with the front-rear direction being the plate thickness direction, in the rear wall portion 32 of the cab 30. In the condenser unit 81, a condenser 83 is disposed on the front side, and a condenser fan 84 is attached so as to overlap the rear side of the condenser 83. The condenser unit 81 is provided in a form in which a front portion of the condenser 83 is embedded in the rear wall portion 32 of the cab 30.

In this way, combine harvester 1 has condenser 83 of air conditioner 80 disposed on the rear side of cab 30. The condenser 83 is disposed below the rear wall portion 32 of the cab 30. That is, the condenser 83 is provided at a position closer to the lower side in the vertical direction of the rear wall portion 32, and is disposed below the rear wall portion 32.

In the rear wall portion 32 of the cab 30, an upper portion of the condenser unit 81 at the location of the arrangement is an inclined upper inclined surface portion 32a that extends along the boundary portion 67 when viewed from the side. The upper inclined surface portion 32a is a rectangular surface portion that is laterally long when viewed from the rear, and a back surface portion that is high at the rear and low at the front is formed at an upper portion on the rear side of the cab 30. The condenser unit 81 is provided at an intermediate portion of the rear wall portion 32 in the left-right direction.

In the rear wall portion 32 of the cab 30, a horizontally long rectangular rear window portion 90 is provided in the upper inclined surface portion 32a on the upper side of the condenser 83. The rear window portion 90 is disposed to face rearward with respect to the interior of the cab 30, and is made a transparent portion so that the exterior can be visually confirmed.

The air conditioning unit 82 includes: a heat exchanger 95 including an evaporator, a heater, and the like; and a blower fan 96 that sends air to the heat exchanger 95. The heat exchanger 95 and the blower fan 96 are provided in a state of being communicated with each other. The heat exchanger 95 and the blower fan 96 are arranged in a lateral direction at the rear portion of the roof portion 35 with the blower fan 96 on the left side and the heat exchanger 95 on the right side. The air conditioning unit 82 is disposed in the roof portion 35 at a position above the condenser unit 81.

The roof portion 35 has a flat outer shape and is formed in a hollow shape. Roof portion 35 includes a lower panel portion 97 which is a frame portion constituting a main body portion of roof portion 35, and an upper panel portion 98 which is provided above lower panel portion 97 and serves as an upper surface portion of cab 30, and a hollow portion is formed by these panel portions. The upper panel portion 98 is a cover portion that covers the lower panel portion 97 from the upper side and the left and right sides as a whole. A concave portion 97d protruding downward is formed in the rear portion of the lower panel portion 97, and an air conditioning housing portion 99 for housing the air conditioning unit 82 is provided in the rear portion of the hollow portion of the roof portion 35 via the concave portion 97 d.

As shown in fig. 11, a refrigerant supply flow path 101 and a refrigerant return flow path 102 are provided between the condenser 83 and the heat exchanger 95. The refrigerant supply flow path 101 has one end connected to one end of a tube for the flow of refrigerant in the condenser 83, and the other end connected to one end of a refrigerant flow path in the heat exchanger 95. The refrigerant return flow path 102 has one end connected to the other end of the tube for the refrigerant flow in the condenser 83, and has the other end connected to the other end of the refrigerant flow path in the heat exchanger 95. These flow paths are constituted by piping members such as hoses, connection fittings, and the like.

An accumulator 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 coupled to the engine 11, and is driven by transmission of power from the engine 11.

As shown in fig. 10, in roof portion 35, a blowing duct 105 for sending air for air conditioning obtained by air conditioning unit 82 into the interior of cab 30 is provided on the front side of air conditioning unit 82. As air for air conditioning, cold air generated by the evaporator of the heat exchanger 95 is compressed in a blower duct 105 by a compressor 104, and is discharged from a discharge port 106 provided in the cabin 30. The air blowing duct 105 branches into left and right branch duct portions 105a in a bifurcated manner from a rear base portion, and each branch duct portion 105a communicates with an outlet 106 provided on a lower side of a front portion of the roof portion 35.

As shown in fig. 6, an outside air intake 110 for taking in outside air with respect to the condenser 83 is provided at a position below the transmission window 70 when viewed from the side. The outside air intake port 110 is a portion of the rear wall portion 32 of the cab 30 in which an outside air flow space portion 111 formed so as to face the front side of the condenser 83 is opened on the right side. The outside air flow space 111 is a space through which outside air flows from the right side of the cab 30.

The outside air circulation space 111 is formed in the middle portion in the vertical direction in the rear wall portion 32 of the cab 30. The outside air circulation space 111 is a flat space formed by a front side wall 112 having a substantially vertical shape and forming an indoor side portion of the cab 30 at the rear wall 32, a rear side wall 113 provided in a parallel shape with respect to the front side wall 112 at a rear side of the front side wall 112, and left and right side surface portions and a bottom surface portion.

The outside air circulation space 111 has a front portion of the upper portion located on the front side of the imaginary plane along which the boundary line A1 is located when viewed from the right side. The condenser 83 is provided so as to penetrate a rear side wall portion 113 forming the outside air circulation space portion 111 and to locate a front side portion in the outside air circulation space portion 111. An opening portion for attaching the condenser 83 is formed in the rear side wall portion 113.

The outside air introduction port 110 is provided as a vertically long opening portion in such a manner that the lower half is opened on the whole in the right side surface portion 114 of the outside air circulation space portion 111. An outside air introduction cover 15 is positioned to the right of the outside air introduction port 110 (see fig. 4).

Further, an outside air introduction port 110 is provided at a position overlapping with the outside air introduction cover 15 when viewed from the side. That is, the whole or substantially the whole of the outside air intake port 110 is covered with the outside air introducing cover 15 in a right side view. In the present embodiment, an outside air intake port 110 is provided at a position overlapping an upper portion of the outside air introduction cover 15 when viewed from the side. Specifically, the outside air introduction port 110 is positioned in the vicinity of a corner portion on the front upper side of the outside air introduction cover 15 as viewed from the right side.

On the rear side and the lower side around the outside air intake opening 110, guide surface portions 115 are provided which are expanded outward (rightward) from the outside air intake opening 110. Further, a member for dust prevention such as a net member may be attached to the outside air intake port 110.

In such a configuration, as shown in fig. 11, the suction force of the normal-rotation condenser fan 84 draws outside air from the outside air intake port 110 into the outside air circulation space 111 (see arrow C1). The outside air taken into the outside air flow space 111 passes through the condenser 83 while exchanging heat in the condenser 83, and is discharged to the rear of the cab 30 as exhaust gas (see arrow C2).

On the other hand, when the condenser fan 84 is reversed, the outside air is taken from the condenser fan 84 into the outside air circulation space 111 through the condenser 83 (see arrow C3). The outside air taken into the outside air circulation space portion 111 is discharged to the outside from the outside air introduction port 110 (refer to an arrow C4).

An outside air introduction duct 120, which is an outside air introduction portion for taking outside air for 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 outside air for the air conditioning unit 82. The external air introduction path is a flow path for taking air of external air outside the cab 30 into an air conditioning housing portion 99 in the vehicle top portion 35, which is a space in which the air conditioning unit 82 is disposed.

As shown in fig. 8, the outside air introduction duct 120 is provided as a duct forming portion extending in the vertical direction at a corner portion on the rear left side of the cab 30, and forms an outside air introduction path extending in the vertical direction. The outside air introduction duct 120 has a substantially rectangular tubular shape so as to have a substantially rectangular shape whose longitudinal direction is the front-rear direction in a plan cross-sectional view.

The outside air introduction duct 120 is provided behind the left side wall 33 of the cab 30 so as to form a side surface portion having the same plane as the left side wall 33 and so as to protrude rearward relative to the rear wall 32. The outside air introduction duct 120 opens the lower side, which is the upstream side of the outside air introduction path, to the outside of the cab 30. The outside air introduction duct 120 allows the upper side on the downstream side of the outside air introduction path to communicate with the air conditioning storage portion 99 in the roof portion 35 via an openable and closable damper portion 125 (see fig. 10).

As shown in fig. 10, the damper portion 125 includes a plate-shaped damper main body 160 that opens and closes an opening formed in the peripheral wall portion of the lower side panel portion 97. The damper main body 160 is supported by a front-rear hinge 163 to be rotatable about a rotation axis in the front-rear direction with respect to a mounting plate 162 fixed to the lower surface portion of the lower panel portion 97. A motor 165 for opening and closing the damper main body 160 is attached to the rear side of the attachment plate 162. The drive shaft of the motor 165 is coupled to the damper main body 160 via an operation arm 167. The operation arm 167 is moved so as to push and pull the shutter main body 160 by driving of the motor 165, and performs opening and closing operations of the shutter main body 160.

The air conditioning unit 82 is configured to: the operation mode is switched between a mode in which outside air is introduced through outside air introduction duct 120 and a mode in which inside air circulates in cab 30 by opening and closing door 125. In the mode of the circulation of the internal air, an internal air inflow port 123 (see fig. 9) into which the internal air of the cab 30 flows is provided in front of the air conditioning unit 82.

As the external air introduction port, the external air introduction duct 120 has an air inlet 138 for introducing external air. The suction port 138 is formed at a lower end portion of the right side surface portion of the outside air introduction duct 120. The air inlet 138 opens the external air introduction passage 120 to the outside. A filter (not shown) for cleaning air is provided inside the outside air introduction duct 120. An openable and closable window portion 180 for maintenance such as a filter is provided in a left side surface portion of the outside air introduction duct 120.

In such a configuration, when the damper portion 125 is opened from the closed state, the outside air flows into the air conditioning storage portion 99 from the outside air introduction duct 120, and the air conditioning unit 82 is switched to the outside air introduction mode. On the other hand, when the damper portion 125 is switched from the open state to the closed state, the internal air in the cab 30 flows into the air conditioning storage portion 99 through the internal air inlet 123, and the air conditioning unit 82 is switched to the internal air circulation mode. The opening and closing of the damper portion 125 is switched by operation of a predetermined operation portion provided in the driver portion 12 and having an operation element such as a button or a switch.

As shown in fig. 12 to 14, the combine harvester 1 includes an exhaust gas purification device 330 for purifying exhaust gas from the engine 11. The exhaust gas purification device 330 has a DPF casing 331 and an SCR casing 332, and introduces exhaust gas from the engine 11 into these casings to remove particulate matter such as soot and Nitrogen Oxide (NO) contained in the exhaust gas _x ) Etc., thereby purifying the exhaust gas.

The DPF casing 331 is a diesel particulate filter casing that removes particulate matter in the exhaust gas of the engine 11. The SCR case 332 forms a system for Selective Catalyst Reduction (SCR) using urea, and is a case for removing nitrogen oxide compounds in the exhaust gas of the engine 11.

The DPF casing 331 includes a diesel oxidation catalyst and a soot filter provided in the casing. The diesel oxidation catalyst is a nitrogen dioxide (NO) generating catalyst ₂ ) An oxidation catalyst such as platinum. The soot filter is a honeycomb filter that continuously oxidizes and removes trapped particulate matter at a relatively low temperature. The SCR housing 332 has an SCR catalyst and an oxidation catalyst disposed within the housing. The SCR catalyst is a catalyst for urea selective catalyst reduction.

Both the DPF casing 331 and the SCR casing 332 are configured as substantially cylindrical casings and have the same size. In each of the DPF casing 331 and the SCR casing 332, a longitudinal direction (a cylinder axis direction) of the substantially cylindrical outer shape is a direction in which exhaust gas flows in the casing. The DPF casing 331 and the SCR casing 332 are disposed in such a manner that the longitudinal direction of the substantially cylindrical outer shape is the front-rear direction, the DPF casing 331 is the lower side, and the SCR casing 332 is the upper side and arranged vertically.

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

With the arrangement structure of the exhaust gas purification device 330 as described above, the DPF casing 331 and the SCR casing 332 are arranged in a state in which they are vertically arranged in an orientation in which the longitudinal direction is the front-rear direction, on the right side, which is the right and left inner sides of the threshing part 6, and behind the driver part 12 above the engine 11.

A supercharger 340 (see fig. 13) is provided in an exhaust manifold constituting an outlet portion of exhaust gas on the front side of the upper portion of the engine 11. The supercharger 340 has an exhaust turbine and a compressor that are coaxially driven with each other, and forcibly sends air to the engine 11. An outlet side of the exhaust gas of the supercharger 340 is connected in communication with one end side (upstream side) of an exhaust pipe 341 for introducing the exhaust gas from the engine 11 into the DPF casing 331. The other end side (downstream side) of the exhaust pipe 341 is connected to an exhaust gas inlet provided at the lower side of the front portion of the DPF casing 331.

A DPF outlet pipe 342 that discharges exhaust gas inside the DPF casing 331 extends from a rear surface portion of the DPF casing 331. The DPF outlet pipe 342 is folded back so as to project leftward and upward from the rear surface portion of the DPF casing 331 and then to face the front side. A downstream side of an SCR inlet pipe 343 which is bent toward the rear side is connected to the exhaust gas inlet port provided on the lower left side of the front portion of the SCR case 332.

A downstream side of the DPF outlet pipe 342 and an upstream side of the SCR inlet pipe 343 are opposed to each other in the front-rear direction, and a urea mixing pipe (not shown) for connecting these pipes to each other is provided between the DPF outlet pipe 342 and the SCR inlet pipe 343. The exhaust gas discharged from the DPF casing 331 to the rear side is folded back to the front side by the DPF outlet pipe 342, and is introduced into the SCR casing 332 through the urea mixing pipe and the SCR inlet pipe 343.

An SCR outlet pipe 346 for discharging exhaust gas in the SCR case 332 is provided on the rear side of the SCR case 332. A tail pipe 347 is attached to the other end side (downstream side) of the SCR outlet pipe 346. The DPF outlet pipe 342 is provided with a urea injection unit 348. The urea solution (urea aqueous solution for selective catalyst reduction) stored in the urea aqueous solution tank is supplied to the urea injection unit 348 by an urea aqueous solution supply device (not shown). Urea injection unit 348 sprays the supplied urea solution into the urea mixing pipe through the injection valve. The urea water supplied to the urea mixing pipe is mixed into ammonia gas in the exhaust gas discharged from the DPF casing 331 and introduced into the SCR casing 332.

In the exhaust gas purification device 330 having the above-described configuration, the exhaust gas of the engine 11 passes through the DPF casing 331, and 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 DPF casing 331 is mixed with ammonia gas generated by hydrolysis by injecting urea water from urea injection unit 348, and introduced into SCR casing 332. The exhaust gas introduced into the SCR housing 332 passes through the SCR housing 332 to receive Nitrogen Oxide (NO) _x ) The effect of reducing the content of (a). The exhaust gas of the engine 11 purified by the DPF casing 331 and the SCR casing 332 as described above is discharged from the tail pipe 347 through the SCR outlet pipe 346 obliquely upward and leftward to the outside of the engine.

A support structure of the exhaust gas purification apparatus 330 on the traveling machine body 4 will be described. Exhaust gas purifying device 330 is supported by support frame 360 and coupling frame 380 with respect to mount portion 25 of traveling machine body 4 (see fig. 15). The support frame 360 is a frame that is provided on the base portion 25 of the travel machine body 4 and supports the cab 12. The coupling frame 380 is a frame that couples the support frame 360 to the base portion 25 of the travel machine body 4.

As shown in fig. 15, the support frame 360 and the coupling frame 380 are configured to surround the periphery of the engine 11 disposed at the front portion of the seat portion 25, and form an engine room 13 (see fig. 3). A cooling fan (not shown) is provided on the right side of the engine 11, and the periphery of the cooling fan is covered with a shroud, and a radiator 14 is provided on the right side of the cooling fan. The cooling fan is rotationally driven, and outside air for cooling is taken into the engine room 13 from a rotary screen 16 of an outside air introduction cover 15 disposed on the right side of the radiator 14 (see fig. 3 and 4).

The support frame 360 has: a lateral frame 361 disposed in the left-right direction above the front of the engine 11; a front-rear extension frame 362 disposed in the front-rear direction on the right of the engine 11 at a position substantially at the same height as the lateral frame 361; and 3 struts of a front left strut 363, a front right strut 364, and a rear right strut 365. The frames and the struts constituting the support frame 360 are formed of square steel pipes.

The front left stay 363 is erected on a support base 373 provided on the left side of the engine 11 on the seat unit 25. The front right stay 364 is located forward of the front left stay 363 in the front-rear direction, and is erected on the seat unit 25 at a position right forward of the engine 11. The rear right pillar 365 is positioned substantially at the same position in the left-right direction as the front right pillar 364, is positioned behind the front right pillar 364, and stands on the base unit 25 at a position behind the engine 11 on the right side.

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

The lateral frame 361 spans horizontally between the front left support 363 and the front-rear extension frame 362. The left end of the lateral frame 361 is fixed to the front surface of the vertically intermediate portion of the front left stay 363 by welding or the like. The right end of the lateral frame 361 is positioned above the front portion of the front-rear extension frame 362, and is fixed and supported to the front-rear extension frame 362 via a predetermined support fitting 366 or the like.

Lateral frame 361 is a frame that supports the rear portion of cab 30 from below. Receiving portions 367, which are horizontal flat plate-shaped portions protruding rearward from the lateral frame 361, are provided on both the right and left sides of the lateral frame 361. The receiving seat 367 is a portion that receives a supporting leg body (not shown) provided at the rear of the bottom surface portion of the cab 30. The supporting leg body is made of an elastic member such as rubber.

Cab 30 is supported by lateral frame 361 in a state where the support leg bodies abut on left and right receiving seat portions 367 from above. Further, the cab 30 is provided to be rotatable forward in the left-right direction serving as a rotation axis direction by a predetermined rotation support portion provided in front of the engine 11 on the seat portion 25, and a rear portion of the cab 30 is detachable from the left-right receiving seat portion 367. With the above configuration, the cab 12 provided in the cab 30 is supported by the support frame 360 provided on the seat unit 25.

The coupling frame 380 includes: a central front-rear extension frame 381 disposed in the front-rear direction above the engine 11; and a rear center pillar 382 that is disposed rearward of the engine 11. The central fore-aft extending frame 381 and the aft central strut 382 are each formed of square steel tubing.

The rear center pillar 382 is provided upright on the seat unit 25 at a position rearward of the right and left center portions of the engine 11. The rear center pillar 382 is provided substantially at the center between the front left pillar 363 and the front right pillar 364 in the left-right direction, and is provided rearward of the rear right pillar 365 in the front-rear direction.

The central front-rear extension frame 381 extends horizontally in the front-rear direction, and is supported at both front and rear ends by the lateral frame 361 and the rear central pillar 382. The front end of the central front-rear extension frame 381 is positioned above the left and right substantially central portion of the lateral frame 361, and is fixedly supported via a support fitting 384 or the like. The rear end of the central front-rear extension frame 381 is supported from below by a rear central pillar 382.

Thus, the central front-rear extension frame 381 and the rear central support 382 forming the coupling frame 380 constitute an L-shaped frame portion having one end side coupled and supported to the lateral frame 361 and the other end side supported to the seat unit 25. A support frame 390 is provided on the central front-rear extension frame 381 with respect to the connection frame 380.

The support frame 390 is a fixing member that supports the DPF casing 331 and the SCR casing 332 in a fixed state on the coupling frame 380. That is, the DPF casing 331 and the SCR casing 332 are fixedly supported by the central front-rear extension frame 381 constituting the coupling frame 380 via the support frame body 390.

The support frame 390 is a member formed in a substantially rectangular plate-like shape, and is fixedly supported via a predetermined support member to the central front-rear extension frame 381 such that the plate thickness direction in the outer shape is the left-right direction. The dpf casing 331 and the SCR casing 332 are positioned on the threshing portion 6 side, i.e., on the left side, with respect to the support frame 390, and are fixedly supported by the support frame 390 by a predetermined fixing member or the like. The support frame 390 is, for example, a cast member and has high rigidity.

The DPF casing 331 and the SCR casing 332 are covered with a cover support frame 420. The cover support frame 420 has substantially the same size as the support frame 390 in the front-rear direction, and is provided to cover the DPF casing 331 and the SCR casing 332 from above and from the left. The cover support frame 420 is provided so that one side is fixedly supported on the threshing portion 6 side and the other side is fixedly supported on the support frame 390 so as to extend right and left above the SCR case 332.

The cover support frame 420 is supported by the threshing part 6 by fixing a support member 425 provided at the lower end portions of the front and rear sides on the left side to a flat surface portion 430 (see fig. 3) provided on the upper surface portion of the threshing part 6. Thus, the cover support frame 420 is provided in a state of protruding from the threshing section 6, is fixed to the upper side of the support frame 390 over the SCR case 332, and supports the support frame 390 supporting the DPF case 331 and the SCR case 332 with respect to the threshing section 6.

The combine harvester 1 includes an intercooler 500 as a cooling device for cooling air supplied to the engine 11 provided in the travel machine body 4. The intercooler 500 functions as a heat exchanger that receives air discharged from the compressor of the supercharger 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 the supply air to the engine 11.

The intercooler 500 is disposed outside the engine with respect to the exhaust gas purification device 330. In the present embodiment, the intercooler 500 is disposed at a right side position with respect to the DPF casing 331 and the SCR casing 332 disposed vertically in the exhaust gas purification device 330. The intercooler 500 is provided at a position on the upper right of the engine 11 in a state of being supported by a predetermined support member on the seat unit 25.

The intercooler 500 forms an outer package of the apparatus by a box-shaped housing 501 having a substantially rectangular parallelepiped outer shape. The housing 501 has a substantially rectangular parallelepiped outer shape, and the intercooler 500 is disposed in an orientation in which the longitudinal direction is the front-rear direction in a plan view and the longitudinal direction is the up-down direction in a front-rear direction view.

The intercooler 500 is provided at substantially the same height as the DPF casing 331 and the SCR casing 332 in the vertical direction. Specifically, the intercooler 500 vertically positions the lower surface portion 501a of the housing 501 below the lower end of the DPF housing 331 and positions the upper surface portion 501b of the housing 501 above the upper end of the DPF housing 331. In the intercooler 500, the upper surface portion 501b of the housing 501 is positioned below the upper end of the SCR housing 332 in the vertical direction.

As described above, exhaust gas purification device 330 and intercooler 500 are disposed behind cab 12 disposed above engine 11, with a space therebetween, and in a state facing each other in the left-right direction. In the present embodiment, the intercooler 500 is positioned to the right of the DPF casing 331 and the SCR casing 332, and is provided in a state where a left side surface portion of the casing 501 faces the support frame 390 positioned on the right side of the DPF casing 331 and the SCR casing 332.

The intercooler 500 disposed at the right side of the exhaust gas purification apparatus 330 is located inside (on the left side) the upper portion of the outside air introduction cover 15 (see fig. 2). An outside air inlet 503 is provided in an upper portion of the outside air introduction cover 15 above the rotary screen 16.

As shown in fig. 4, the suction port 503 has a structure in which a mesh-like dust-proof net 503b is stretched over an opening 503a formed in the outside-air introducing cover 15. The opening 503a has a circular shape that follows the outer shape of the upper portion of the outside air introduction cover 15 and follows the lower side of the opening 16a of the rotary screen 16. The intercooler 500 is disposed to overlap with the suction port 503 in most part in a right side view.

An air inlet pipe 505 and an air outlet pipe 506 are disposed between the intercooler 500 and the engine 11 (see fig. 11).

One end side, i.e., the upstream side, of the air inflow pipe 505 is connected to the compressor side of the supercharger 340. As shown in fig. 16, the other end side, i.e., the downstream side, of the air inflow duct 505 is connected to an inflow port 507 provided in the front portion of the lower surface portion 501a of the casing 501. In addition, the air inflow pipe 505 is disposed to be submerged into the lower side of the horizontal frame 361. The inlet 507 is a cylindrical projecting portion provided at the front of a duct 509 provided below the lower surface 501a of the case 501 and opening leftward.

An air inflow duct 505 is disposed toward the left from the inflow port 507 and projects forward and downward on the right side of the engine 11, being connected from the right with respect to a supercharger 340 provided at the front upper portion of the engine 11. The air discharged from the compressor of the supercharger 340 is supplied to the intercooler 500 through the air inflow pipe 505. The cooling medium is cooled while passing through a predetermined air passage 504 (see fig. 11) having fins or the like provided in the case 501.

An upstream side, which is one end side of the air outflow pipe 506, communicates with an outflow port 508 provided at a rear portion below the lower surface portion 501a of the casing 501 (see fig. 16). The outlet 508 is a cylindrical protruding portion that is provided at the rear of the duct 509 and opens leftward. The other end side, i.e., the downstream side, of the air outflow pipe 506 is connected to an intake manifold of the engine 11.

The air outflow pipe 506 extends downward to the front left from the outflow port 508, and is connected to the intake manifold located at the upper rear portion of the engine 11 from the right. The air cooled in the casing 501 is supplied to the intake manifold of the engine 11 through the air outflow pipe 506.

A support structure of the intercooler 500 on the base portion 25 will be explained. The intercooler 500 is provided in a state of being supported by the support frame 360, similarly to the exhaust gas purification apparatus 330.

The intercooler 500 is provided in a state of being supported by the front-rear extension frame 362 constituting the support frame 360. The intercooler 500 is supported by the front and rear extension frames 362 by fixing the support stay 512 provided in the housing 501 to the support protruding piece portion 511 provided in the front and rear extension frame 362 at both front and rear sides of the housing 501. The support protruding piece 511 and the support portion 510 supporting the stay 512 are formed symmetrically in the front-rear direction. Fig. 17 shows a support portion 510 of the rear side of the intercooler 500. In fig. 17, the duct 509 and the like are not shown.

The support projecting piece 511 is provided on the upper surface 362c of the front-rear extension frame 362 by fixing a bent plate-like fitting formed in a substantially U-shape in plan view, by welding or the like, in a standing state with the left side facing the open side. The support projecting piece 511 has a flat surface portion whose plate thickness direction is the left-right direction as a fixed surface portion 511a to which the support stay 512 is fixed. A hole for fixing is formed through the fixing surface portion 511a. The support projecting piece portions 511 are provided at the front and rear 2 at intervals larger than the dimension of the housing 501 in the front-rear direction.

The support stay 512 is a long curved plate-like member having a substantially L-shaped cross-sectional shape, and is fixed to the front surface portion 501d and the rear surface portion 501e of the housing 501 in the vertical direction. The support stay 512 has, as a face portion forming a substantially L-shaped cross section: a fixed surface portion 512a fixed to the case 501 side; and a support surface portion 512b fixed to the support projecting piece portion 511 side.

The support stay 512 is provided in a state in which an upper fixing surface portion 512a is fixed to the front surface portion 501d or the rear surface portion 501e by welding or the like and a lower portion protrudes downward from the lower surface portion 501a with respect to the housing 501. The support stay 512 is fixed to the support projecting piece 511 by a fixing bolt 513 in a state where a support surface portion 512b at the lower end portion is overlapped from the right side with respect to a fixing surface portion 511a of the support projecting piece 511. The fixing bolt 513 is inserted through the support surface portion 512b and the fixing surface portion 511a to a nut portion 514 provided on the left side of the support surface portion supporting the protruding piece portion 511.

In this way, the support stay 512 forms downward-projecting legs on both the front and rear sides of the housing 501, and the lower ends of the legs are fixed to support projecting pieces 511 projecting from the front and rear extension frames 362. Therefore, a space is formed between the upper surface 362c of the front-rear extension frame 362 and the lower surface portion 501a of the case 501, and this space serves as a placement space for the duct portion 509 and the like connecting the air inflow pipe 505 and the air outflow pipe 506.

As described above, the combine harvester 1 includes, as a frame structure provided on the base unit 25: a coupling frame 380 as a first support frame that supports the exhaust gas purification device 330 with respect to the support frame 360; and a front-rear extension frame 362 as a second support frame, which supports the intercooler 500. The coupling frame 380 and the front-rear extension frame 362 are coupled and supported by a lateral frame 361 as a coupling member.

The intercooler 500 is supported and coupled to the support frame 390 by front and rear 2 support rods, i.e., the first support rod 521 and the second support rod 522, which are bridged between the support frame 390 that supports the exhaust gas purification device 330.

Each of the first support rod 521 and the second support rod 522 is a linear tubular member having a circular cross-sectional shape, and is disposed in a substantially right-left direction with a slight height from the left. The first support bar 521 is located rearward with respect to the second support bar 522.

The first support rod 521 is fixed by a bolt or the like at a left end thereof to a predetermined fixed portion provided in an intermediate portion between an upper portion and a front and rear portion of the support frame 390. The first support bar 521 fixes the other end portion on the right side to the upper left corner of the rear surface portion 501e of the housing 501 with a bolt or the like.

The second support rod 522 has one end portion on the left side fixed to a predetermined fixing portion provided at a rear end portion of an upper portion of the support frame 390 by a bolt or the like. The second support rod 522 is fixed by a bolt or the like to the other end portion on the right side with respect to an elongated support stay 529 fixedly provided at the upper left corner of the front surface portion 501d of the housing 501.

The intercooler 500 provided in the housing unit 25 as described above includes a cooling device fan 540 as a cooling fan capable of blowing air to the exhaust gas purification device 330 side. As shown in fig. 11, cooling device fan 540 is an electric fan including fan body 541 and electric fan motor 542 as a drive source for driving fan body 541. A drive shaft of the fan motor 542 is connected to a central shaft portion of the fan main body 541.

The cooling fan 540 is configured to be rotatable in the forward and reverse directions. That is, the cooling device fan 540 is configured to: the fan main body 541 can be rotated in either the normal rotation direction or the reverse rotation direction by the driving force of the fan motor 542.

The cooling device fan 540 is disposed on the left side in the housing 501 in such a manner that the rotation axis direction of the fan body 541 is the left-right direction. A ventilation opening 501f (see fig. 16) which is a circular opening is formed in the left side surface portion 501c of the housing 501 concentrically with the fan main body 541. The ventilation opening 501f is formed to expose substantially the entire cooling device fan 540 in a left side view.

On the other hand, the right side surface portion of the case 501 has a structure in which a mesh-like dust screen 501g is stretched over a rectangular frame portion along the outer shape of the case 501 (see fig. 14). As shown in fig. 14, a dust-proof rotary blade 544 that rotates by an air flow generated by the rotation of the fan 540 is provided on the right surface portion of the housing 501 outside (right side) the dust screen 501 g.

As shown in fig. 11, in such a configuration, in a state where cooling device fan 540 is rotating in the normal direction, suction force of cooling device fan 540 causes suction port 503 of outside air introduction cover 15 positioned on the right side of internal cooler 500 to be an intake port for outside air, and the air is supplied to internal cooler 500. That is, the air taken in from the air inlet 503 is taken in from the dust-proof net 501g into the casing 501 as cooling air for the air passing through the air passage 504, and is sent to the left from the air vent 501f of the casing 501 while being heat-exchanged by the outer wall surface of the air passage 504 (see arrow D1). The air sent out from the air vent 501f becomes air to the DPF casing 331 and the SCR casing 332.

On the other hand, when the cooling fan 540 is rotated in the reverse direction, the air in the body is taken into the housing 501 through the air vent 501 f. The air taken into the housing 501 is discharged from the dust-proof mesh 501g and is discharged to the outside from the suction port 503 of the outside air introduction cover 15 (refer to an arrow D2).

When the cooling device fan 540 is rotated in the normal direction, dust such as dust, dirt, and straw is collected by the dust-proof net 503b of the suction port 503 and the dust-proof net 501g of the housing 501, and is prevented from entering the housing 501 together with the outside air. On the other hand, when cooling fan 540 is reversed, dust adhering to dust screen 501g of case 501 and dust screen 503b of inlet 503 is removed by the air blown from cooling fan 540. Also, when the condenser fan 84 is reversed, the dust adhering to the dust screen 503b at the suction port 503 of the outside air introduction cover 15 is removed by the air blown out to the outside from the outside air introduction port 110.

The combine harvester 1 further includes an air filter 561 and a pre-filter 562 that constitute an air supply system of the engine 11. The air cleaner 561 and the pre-cleaner 562 are connected to each other through an air supply pipe 563.

The precleaner 562 is provided at an upstream end of the intake passage with respect to the engine 11, and the air is taken into the intake passage from the precleaner 562. Dust and the like in the atmosphere are removed by the pre-filter 562, and the atmosphere to be taken into the air supply path is purified.

An air cleaner 561 is provided downstream of the precleaner 562 via an air supply pipe 563. The air purified by the precleaner 562 is further purified by an air cleaner 561 and supplied 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 in an orientation in which the cylinder axis direction (longitudinal direction) is the front-rear direction. The downstream air supply pipe 565 extends from the air discharge side of the air cleaner 561, and the downstream side of the downstream air supply pipe 565 is connected to an air supply intake part provided on the compressor side of the supercharger 340 (see fig. 13).

The gas supply pipe 563 is disposed to pass between the first and

second support rods

521 and 522. The air supply pipe 563 is supported by a linear rod-shaped pipe support rod 570 extending from the intercooler 500 with respect to the intercooler 500. The pipe support rod 570 is fixedly supported at its lower end portion by bolts or the like at the upper portion of the rear surface portion 501e of the housing 501, and at its upper end portion at the intermediate portion of the air supply pipe 563.

According to the arrangement structure of the air supply system of the engine 11 as described above, the DPF casing 331 and the SCR casing 332 are arranged vertically above and to the left of the engine 11, and the air cleaner 561 and the pre-cleaner 562 are arranged vertically above and to the right of the engine 11. That is, the engine 11 is disposed at the upper rear portion thereof with the following left and right sides apart: an exhaust gas purification device 330 (DPF casing 331 and SCR casing 332) connected to an exhaust pipe 341 extending rearward from an exhaust turbine side (left side) of a supercharger 340 positioned at a front portion of the engine 11; and an air cleaner 561 and a precleaner 562 disposed thereabove, and is connected to a downstream air supply pipe 565 extending rearward from the compressor side (right side) of the supercharger 340.

As described above, the combine harvester 1 according to the present embodiment includes: a condenser unit 81 of the air conditioner 80, which is provided in the rear wall portion 32 of the cab 30, and includes a condenser 83 and a condenser fan 84; and an intercooler 500 having a cooling device fan 540.

As for the intercooler 500, the combine harvester 1 has the following structure. That is, the intercooler 500 is provided on the side of the traveling machine body 4 so that the cooling air by the cooling device fan 540 and the cooling air by the condenser fan 84 are merged.

As shown in fig. 11, condenser fan 84 is provided behind condenser 83, and condenser 83 is provided on rear side wall portion 113 forming outside air flow space portion 111 in rear wall portion 32 of cab 30. The direction of the cooling air by the condenser fan 84 is rearward (see fig. 11 and arrow C2).

With respect to the condenser fan 84 disposed in this manner, the interior cooler 500 is provided on the right side on the rear side of the cab 30. The interior cooler 500 is disposed in the vicinity of the left side of the outside air introduction cover 15, and the outside air introduction cover 15 covers the outside air introduction port 110, which is formed by opening the outside air circulation space portion 111 to the right, from the right side. The direction of the cooling air by cooling device fan 540 positioned on the left side of intercooler 500 is the left direction (see fig. 11, arrow D1).

The destination of the cooling air from the cooling fan 540 for the cooling device is the space to which the cooling air from the fan 84 for the condenser is discharged. That is, a space behind the rear wall portion 32 of the cab 30, which serves as a discharge destination of the cooling air from the condenser fan 84, and a space behind the discharge destination of the cooling air from the cooling device fan 540 overlap each other, and the cooling air merging portion 600 where the cooling air from the condenser fan 84 and the cooling device fan 540 merge together is formed. The cooling air merging portion 600 is an arrangement space of the exhaust gas purification device 330 and the like.

In this way, the intercooler 500 is provided on the right of the cooling air merging portion 600 so that the cooling air by the cooling device fan 540 is directed to the cooling air merging portion 600 behind the cab 30 to which the cooling air by the condenser fan 84 of the condenser unit 81 is discharged. That is, in the internal cooler 500, the discharge direction of the cooling air from the cooling device fan 540 is set leftward with respect to the condenser fan 84 that discharges the cooling air rearward, and the discharge directions of the cooling air from both fans are set orthogonal to each other.

In the combine harvester 1, an outside air intake port 110 for taking in outside air to the condenser 83 is provided at a position laterally aligned with respect to the intercooler 500 when viewed from the side of the travel machine body 4.

As described above, with respect to interior cooler 500 provided on the right side of the rear side of cab 30, outside air intake port 110 is open to the right of rear wall portion 32 of cab 30. That is, the interior cooler 500 is provided at a position right behind the cab 30, with the side surface of the rectangular parallelepiped case 501 facing the front, rear, left, and right sides, and the outside air intake port 110 is provided at a position near the front of the interior cooler 500 (see fig. 4 and 6). In this way, the outside air intake port 110 and the intercooler 500 are provided in a front-rear arrangement at the right side portion of the front portion of the travel machine body 4.

Further, the intercooler 500 is disposed between the cab 30 and the grain tank 7. The grain tank 7 is located behind the cab 30 on the travel machine body 4, and is provided behind the outside air introduction cover 15 in the front-rear direction. The intercooler 500 is provided such that the entire housing 501 is covered from the right by the outside air introduction cover 15.

Therefore, the grain tank 7 is provided so that the front surface portion 7a, which is a vertical flat portion, is positioned behind the intercooler 500 (of the housing 501) with respect to the intercooler 500 provided on the right side and behind the cab 30 (see fig. 2). In this way, the intercooler 500 is provided between the cab 30 and the grain tank 7 in the front-rear direction at the right side portion of the travel machine body 4.

The control structure of the condenser fan 84 and the cooling device fan 540 (hereinafter also referred to as "both

fans

84 and 540") and the control of these fans will be described.

As shown in fig. 18, the combine harvester 1 includes a controller 550 that controls the rotation of the condenser fan 84 and the cooling device fan 540. The

fans

84 and 540 are connected to the controller 550 via a predetermined connection cable. The controller 550 controls the operation of the

fans

84 and 540, i.e., the normal rotation, reverse rotation, and stop of the fans.

The controller 550 controls each unit included in the combine harvester 1 based on input signals from various sensors and the like included in the combine harvester 1. The controller 550 has a configuration in which a storage device such as a CPU (Central Processing Unit), a RAM (Random Access Memory), or a ROM (Read Only Memory), an input/output device (input/output circuit) such as an input/output interface for data input/output, a peripheral circuit such as a clock circuit, and the like, which are arithmetic Processing devices for executing various arithmetic Processing and control, are connected via a bus or the like. The CPU of the controller 550 performs arithmetic processing in accordance with various programs stored in the ROM and the like.

The controller 550 is configured to include a plurality of microcomputer units connected by a Controller Area Network (CAN) so as to be able to communicate with each other, for example. However, the structure of the controller 550 is not particularly limited.

As described above, the condenser fan 84 and the cooling device fan 540 are configured to be capable of rotating in the forward direction and in the reverse direction with respect to the rotational direction in which the cooling air is blown. The controller 550 controls the

fans

84 and 540 to rotate in the same rotational direction at the same time.

The condenser fan 84 is controlled in the rotational direction of the fan main body 85 by controlling the operation of the fan motor 86 by the controller 550. The condenser fan 84 and the controller 550 are configured, for example, as follows: the operation of the condenser fan 84 is controlled by controlling the fan motor 86 by PWM (Pulse Width Modulation) control.

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

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

In addition, the rotation speed of each fan can be changed in the rotation control of both

fans

84 and 540 by the controller 550. The rotation direction of each fan may be operated by an operation unit provided in the driver unit 12, for example.

The controller 550 rotates the condenser fan 84 and the cooling device fan 540 forward in a normal operation state of the combine harvester 1 in which the combine harvester 1 harvests the grain and stalk, for example. Then, the controller 550 simultaneously reverses the

fans

84 and 540 for a predetermined time period at the time point when the combine harvester 1 is in the non-operating state, for example. The operating state and the non-operating state of the combine harvester 1 are determined by detecting the operation of a predetermined part of the operating unit such as the harvesting unit 5, the threshing unit 6, and the discharge auger 9.

The controller 550 controls the condenser fan 84 and the cooling device fan 540 so that the normal rotation and the reverse rotation of the fans are switched at the same time point in a predetermined cycle. For example, during operation of the combine harvester 1, the controller 550 reverses the

fans

84 and 540 for a predetermined time (e.g., 10 seconds) at predetermined time intervals (e.g., 30 minutes). As described above, as one mode of the control of the

fans

84 and 540 by the controller 550, a cycle of switching the normal rotation and the reverse rotation of the

fans

84 and 540 at a predetermined time is repeated.

The controller 550 performs rotation control of the

fans

84 and 540 as follows, for example. That is, the controller 550 performs a control of repeating the cycle by setting, as 1 cycle, a control of rotating both the

fans

84 and 540 forward for a predetermined time, then stopping both the

fans

84 and 540 for several seconds, then rotating both the

fans

84 and 540 backward for a predetermined time, and then stopping both the

fans

84 and 540 for several seconds during the operation of the engine 11. As described above, the controller 550 may control the

fans

84 and 540 by switching between normal rotation, stop, and reverse rotation of the

fans

84 and 540 at a predetermined time.

As an example of the control mode of the condenser fan 84 and the cooling fan 540, the controller 550 controls the timing of reversing the

fans

84 and 540 based on the rotation state of the discharge auger 9.

As shown in fig. 18, as a structure for detecting the rotation state of the discharge auger 9, the combine harvester 1 has: a screw conveyor rotational position detection sensor 551 that detects the rotational position of the discharge screw conveyor 9; and an auger housing state detection sensor 552 that detects that the discharge auger 9 is in the housing state. The auger rotation position detection sensor 551 and the auger housing state detection sensor 552 are connected to the controller 550, and the controller 550 receives detection signals from the sensors and generates control signals for controlling the operation of the

fans

84 and 540 based on the signals.

The auger rotational position detection sensor 551 detects the position of the discharge auger 9 with respect to the rotational direction, which is provided so as to be rotatable (rotated) with the vertical direction as the rotational axis direction via the longitudinal take-out conveyor 9 b. The auger rotational position detection sensor 551 is, for example, a potentiometer type sensor, and detects the rotational position (rotational angle) of the discharge auger 9 by indirectly detecting the rotation of a portion that rotates as a part of the discharge auger 9 in the longitudinal take-out conveyor 9b via a gear or the like.

However, the structure of the auger rotational position detection sensor 551 is not particularly limited. The auger turning position detection sensor 551 may detect, for example, a turning angle of the discharge auger 9 around the vertical take-out conveyor 9b, and an angle of vertical lifting turning around the base of the discharge auger 9.

The auger housing state detection sensor 552 is, for example, a detection switch (see fig. 3) provided at the bottom of the auger retaining frame 27. The auger housing state detection sensor 552 detects the housing state and the non-housing state of the discharge auger 9 by whether or not the discharge auger 9 is housed and supported in the auger holding frame 27, that is, whether or not the discharge auger 9 exists in the auger holding frame 27.

In such a configuration, the controller 550 controls the timing of reversing the condenser fan 84 and the cooling device fan 540 based on the detection signal of at least one of the auger rotational position detection sensor 551 and the auger housing state detection sensor 552.

When discharging the grains in the grain tank 7 to the outside, the discharge screw conveyor 9 is rotated from the stored state so that the tip end portion is positioned on the side of the machine body. Therefore, for example, after detecting the non-storage state of the discharge auger 9, the controller 550 controls the condenser fan 84 and the cooling device fan 540 to be reversed for a predetermined time at the time point when the discharge auger 9 returns to the storage state or the storage position.

Here, the "storage position" with respect to the discharge auger 9 is the rotational position of the discharge auger 9 detected by the auger rotational position detection sensor 551, and is a rotational position corresponding to the storage state of the discharge auger 9. That is, when the discharge auger 9 is returned to the storage state from the state of being rotated laterally, the discharge auger reaches the storage position which is the position above the auger fixing frame 27, and then is lowered around the base, thereby being placed and supported on the auger fixing frame 27, that is, the storage state. In this way, the discharge auger 9 has a storage position corresponding to the storage state of the discharge auger 9 with respect to the rotational state.

An example of the reverse rotation control of the condenser fan 84 and the cooling fan 540 by the controller 550 will be specifically described. When detecting that the discharge auger 9 has reached the storage position, the controller 550 reverses the condenser fan 84 and the cooling device fan 540 for a predetermined time period T1.

An example of a control mode performed by the controller 550 will be described with reference to a flowchart shown in fig. 19. Fig. 19 is a flowchart showing an example of the control mode of the condenser fan 84 and the cooling device fan 540 by the controller 550. The control described below is performed by the CPU of the controller 550 reading out and executing a predetermined control program stored in a storage device such as a RAM.

As shown in fig. 19, the controller 550 causes the condenser fan 84 and the cooling device fan 540 to rotate in the normal direction (S10). That is, the controller 550 rotates the

fans

84 and 540 in the normal direction during normal operation of the combine harvester 1, such as when harvesting work is performed while traveling by the traveling machine body 4.

When the combine harvester 1 is normally operated, the controller 550 determines whether the discharge auger 9 is in a non-storage state by a detection signal of the auger storage state detection sensor 552 (S20). The non-storage state of the discharge screw conveyor 9 corresponds to a state in which the discharge screw conveyor 9 is rotated to the side of the machine body for discharging the grain in the grain tank 7 to the outside, for example. When the discharge screw 9 is not in the non-storage state (S20, no), that is, when the discharge screw 9 is in the storage state, the controller 550 continues to rotate the

fans

84 and 540 forward (S10).

In step S20, in the case where the controller 550 detects that the discharge auger 9 is in the non-storage state by the detection signal of the auger storage state detection sensor 552 (S20, yes), it determines whether or not the discharge auger 9 is in the storage position by the detection signal of the auger rotational position detection sensor 551 (S30). When the discharge screw conveyor 9 is not in the storage position (S30, no), the controller 550 continues to rotate both the

fans

84 and 540 forward (S10).

In step S30, when the controller 550 detects that the discharge auger 9 is at the storage position based on the detection signal of the auger rotation position detection sensor 551 (yes in S30), it determines whether or not a predetermined working time T2 set in advance has elapsed since the detection of the non-storage state of the discharge auger 9 in step S10 (S40). The operation time T2 is set to about 10 minutes, for example. Step S40 is a process for eliminating the return of the discharge auger 9 to the stored state within a relatively short time after the stored state is changed to the non-stored state. That is, step S40 is a process for detecting that the discharge operation of the grain by the discharge screw conveyor 9 is actually performed.

In step S40, if the controller 550 determines that the operation time T2 has elapsed since the detection of the non-storage state of the discharge screw conveyor 9 (yes in S40), the condenser fan 84 and the cooling device fan 540 are reversed for a predetermined time period T1 (S50). In this case, the controller 550 determines that the discharge operation of the grain by the discharge screw 9 is completed and the discharge screw 9 is in a return state, and performs control to switch the rotation directions of the two

fans

84 and 540 that are rotating in the normal direction to the reverse direction at the same time point. The predetermined time T1 is set to, for example, about 10 seconds.

After the condenser fan 84 and the cooling fan 540 are rotated in reverse for the predetermined time T1 in step S50, the controller 550 returns both the

fans

84 and 540 to the normal rotation state.

Either one of the rotation control of the two

fans

84 and 540 based on the rotation state of the discharge screw 9 as described above and the cycle control of repeating the cycle of switching the operation of the two

fans

84 and 540 at a predetermined time point as described above can be arbitrarily set as the control mode of the two

fans

84 and 540. In this case, as the operation unit for switching the control modes of the

fans

84 and 540, for example, a fan control mode switching operation unit such as a button or a switch is provided in the driver unit 12. The controller 550 controls the rotation of the

fans

84 and 540 according to the control mode selected by the fan control mode switching operation unit. For example, when the harvest of the combine harvester 1 is a harvest that generates relatively large amounts of dust such as wheat, the circulation control is selected in which the reverse rotation operations of the

fans

84 and 540 are performed at predetermined time points regardless of the operation of the discharge auger 9.

According to the combine harvester 1 of the present embodiment having the above-described configuration, the following operational advantages can be obtained.

According to the combine harvester 1 of the present embodiment, the layout of the intercooler 500 for cooling the air supplied to the engine 11 can be improved, the cooling effect of the intercooler 500 can be improved, and the body can be made compact.

In the combine harvester 1, the intercooler 500 is disposed on the right side of the body with respect to the condenser fan 84 provided on the back surface side of the cab 30 so that the cooling air by the cooling device fan 540 and the cooling air by the condenser fan 84 merge. With such a configuration, ventilation of the intercooler 500 by the cooling device fan 540 can be improved, and a good cooling effect can be obtained for the intercooler 500. Further, since the internal cooler 500 is disposed at a relatively high position with respect to the seat portion 25 in the traveling machine body 4, for example, the radiator 14 can be disposed in a space below the internal cooler 500, and thus the space above the seat portion 25 can be effectively utilized, and the internal cooler 500 and the device configuration around the internal cooler can be compactly housed.

In addition, in the combine harvester 1, an outside air intake port 110 for taking outside air to the condenser 83 is provided at a position laterally aligned with the intercooler 500 in a right side view. With this configuration, the outside air intake port 110 for the condenser 83 can be disposed on the side of the machine body, and the machine body can be compactly housed.

Further, the intercooler 500 is disposed between the cab 30 and the grain tank 7. With this configuration, the space between the cab 30 and the grain tank 7 on the seat unit 25 can be effectively used, and the internal cooler 500 can be compactly housed in the seat unit 25.

The condenser fan 84 and the cooling fan 540 are controlled by the controller 550 to rotate in the same rotational direction at the same time. With this configuration, dust such as dust, dirt, and straw can be prevented from adhering to the filter such as the dust screen 16b of the rotary screen 16 and the dust screen 503b of the suction port 503 in the outside air introduction cover 15.

The condenser fan 84 and the cooling fan 540 continue to rotate in the normal direction, and therefore the dust attached to the dust screens 16b and 503b of the outside air introduction cover 15 becomes a cause of reduction in the wind speed by both

fans

84 and 540. If the wind speed decreases, the cooling of condenser 83 becomes insufficient, the cooling performance of air conditioner 80 decreases, and the cooling performance by intercooler 500 decreases.

Therefore, by reversing the

fans

84 and 540 at the same time, dust adhering to the dust screens 16b and 503b of the outside air introduction cover 15 can be blown off. In particular, by simultaneously reversing the

fans

84 and 540, the discharged air from the outside air intake 110 by the condenser fan 84 (see fig. 11 and arrow C4) and the discharged air to the outside of the internal cooler 500 by the cooling device fan 540 (see fig. 11 and arrow D2) cooperate with each other, whereby dust adhering to the dust-proof net 16b and the dust-proof net 503b of the outside air introducing cover 15 can be efficiently blown off and removed. This can suppress a decrease in cooling performance of air conditioner 80 and intercooler 500. In addition, removing dust adhering to the dust-proof net 16b and the dust-proof net 503b of the outside air introduction cover 15 also contributes to suppression of overheating of the engine 11.

Further, the controller 550 controls the time point at which the condenser fan 84 and the cooling device fan 540 are reversed based on the rotation state of the discharge auger 9. With this configuration, both the

fans

84 and 540 can be reversed at appropriate timing in relation to the grain discharging operation by the discharge screw conveyor 9, which is relatively likely to cause adhesion of dust to the dust-proof net 16b and the dust-proof net 503b of the outside air introduction cover 15. This makes it possible to efficiently remove dust adhering to the dust-

proof nets

16b and 503b of the outside-air introducing cover 15.

In particular, the controller 550 controls the condenser fan 84 and the cooling device fan 540 to be reversed for a predetermined time period T1 on condition that the discharge auger 9 reaches the storage position. With this configuration, since the state after the discharge operation of the grains by the discharge screw conveyor 9 can be detected, the

fans

84 and 540 can be reversed at a more appropriate timing, and the dust adhering to the dust screen can be effectively removed.

In particular, in the present embodiment, the controller 550 detects that the discharge auger 9 has reached the storage position when the

fans

84 and 540 are reversed, and sets the condition that the operation time T2 has elapsed since the discharge auger 9 is changed from the storage state to the non-storage state. According to such a control mode, for example, when the discharge screw conveyor 9 is temporarily rotated regardless of the discharge operation of the grain by the discharge screw conveyor 9, the rotation operation of the discharge screw conveyor 9 that is not directly related to the discharge operation of the grain can be eliminated from the operation as the detection target for reversing the

fans

84 and 540. This can improve the detection accuracy of the operating state of the grain, and can suppress unnecessary reverse operation of the

fans

84 and 540.

In this way, in the fan reverse rotation control by the controller 550, the time point at which the condenser fan 84 and the cooling device fan 540 are reversed is the time point at which the discharge auger 9 is returned to the storage position after the discharge operation of the grain, and at this time point, the combine harvester 1 is in the non-operation state. For example, when the

fans

84 and 540 are reversed in the operating state of the combine harvester 1 in which the load on the engine 11 is relatively large, the hot air around the engine 11 is supplied to the intercooler 500, and therefore, the output of the engine 11 is not preferable.

Therefore, by reversing the

fans

84 and 540 at the time point when the engine 11 is in the non-operating state with a relatively small load, the dust adhering to the dust screen can be efficiently removed during the intermittent period of the operation. This makes it possible to shift to the next operation in a state where dust adhering to the dust screen is removed, and therefore, it is possible to smoothly perform continuous operations performed by the combine harvester 1.

The above embodiment is an example of the present invention, and the present invention is not limited to the above embodiment. Therefore, it is needless to say that various modifications can be made in accordance with design and the like without departing from the technical idea of the present invention in the embodiments other than the above embodiments. The effects described in the present disclosure are merely illustrative and not restrictive, and other effects may be obtained.

Claims

1. A combine harvester is provided with a cab covering a cab, and is characterized by comprising:

a condenser unit of an air conditioner, which is provided on a rear wall portion of the cab, and includes a condenser and a condenser fan; and

a cooling device having a cooling device fan for cooling air supplied to an engine provided in a traveling machine body,

the cooling device is provided on a side of the traveling machine body so that cooling air by the cooling device fan and cooling air by the condenser fan are merged.

2. A combine harvester according to claim 1,

an outside air intake port for taking in outside air to the condenser is provided at a position laterally aligned with respect to the cooling device when viewed from a side surface of the travel machine body.

3. A combine harvester according to claim 1 or 2,

is provided with a grain box arranged on the running machine body,

the cooling device is disposed between the cab and the grain tank.

4. A combine harvester according to any one of claims 1-3,

a controller for controlling the rotation of the condenser fan and the cooling device fan,

the condenser fan and the cooling device fan are configured to be capable of rotating in reverse with the rotating direction in which cooling air is delivered being a normal direction,

the controller controls the condenser fan and the cooling device fan to rotate in the same rotational direction at the same time.

5. A combine harvester according to claim 4, comprising:

a grain tank provided on the travel machine body; and

a grain discharging device which is arranged to be capable of rotating relative to the running machine body and is used for discharging grains in the grain box to the outside,

the controller controls a time point at which the fan for the condenser and the fan for the cooling device are reversed based on a rotation state of the grain discharging device.

6. A combine harvester according to claim 5,

the grain discharging device has a storage position corresponding to the storage state of the grain discharging device for the rotation state,

the controller causes the condenser fan and the cooling device fan to rotate in reverse for a predetermined time period when the controller detects that the grain discharging device has reached the storage position.