JP2012159012A - Driving part structure of combined harvester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving part structure of a combined harvester that suppresses an excessive load of a fan transmission system when discharge blowing air is selected for removing clogging of a dustproof filtering body of a radiator, and minimizes loss time before blowing discharge air, thereby securing cooling efficiency of an internal combustion engine.SOLUTION: This driving part structure of the combined harvester includes a suction fan (13), a radiator (12), and a dustproof filtering body (7a) of the radiator (12). A discharge fan (14) is arranged coaxially with the suction fan (13). A switching means (23b) is arranged for alternatively selecting a cooling state for stopping driving of the discharge fan (14) by driving the suction fan (13) in the outside air suction direction, and a dust removing state for driving the discharge fan (14) in the dust-removed wind blowout direction by stopping driving of the suction fan (13). The duration of the cooling state and the dust removing state can be changed by a control part (41) for controlling the switching means (23b).

Description

  The present invention relates to a combiner drive section structure.

  As shown in Patent Document 1, there is known a prime mover structure in which a mesh-like dustproof filter is provided on the outside of a radiator at the position of the combiner outer surface. This heat exchange device introduces outside air from the outside of the fuselage by a suction fan inside the radiator to exchange heat of the cooling water of the internal combustion engine, and blocks the inflow of dust mixed in the introduced outside air by a dustproof filter. Therefore, it is possible to maintain the output of the internal combustion engine by avoiding clogging of the radiator in the cutting operation in which the soil waste and the harvested grain waste are rolled up, and for the dust prevention by reversing the suction fan driven by the belt The clogging can be eliminated by blowing off the dust adhering to the outside of the filter body.

JP 2001-263063 A

  However, when the suction fan is driven in reverse rotation, a large load acts on the transmission belt because it is necessary to drive the transmission belt in the reverse direction against its rotational inertia, and there is a time loss until the fan starts reverse rotation operation. As a result, there have been a problem of durability reduction due to wear of the transmission belt and a problem of engine output being reduced due to a decrease in cooling efficiency.

  The problem to be solved is to suppress the excessive load of the fan transmission system when switching to the exhaust air to remove clogging of the filter for dust prevention of the radiator, and to minimize the loss time until shifting to the exhaust air An object of the present invention is to provide a prime mover structure for a work vehicle that can secure cooling efficiency of an internal combustion prime mover by a radiator while limiting to a limit.

  According to the first aspect of the present invention, a suction fan (13) for sucking outside air from the outside of the machine body is disposed inside the radiator (12) for exchanging heat of the cooling water of the internal combustion engine, and the suction is performed outside the radiator (12). In the prime mover structure of a combine provided with a dustproof filter body (7a) for filtering the dust in the outside air sucked by the fan (13), the suction fan (13) has a portion inside the suction fan (13). A discharge fan (14) that rotates coaxially with the rotation axis is provided, and the suction fan (13) is driven in a state in which the drive of the discharge fan (14) is stopped, so that the outside of the dustproof filter body (7a). The exhaust fan (14) is driven in a cooling state in which outside air is sucked from the inside to the inside, and the suction fan (13) is stopped to blow dust-removing air from the inside to the outside of the dustproof filter body (7a). Select dust removal status Switching means (23b) for switching to the above state, switching to the dust removal state after maintaining the cooling state for the first set time, returning to the cooling state after maintaining the dust removal state for the second set time, and thereafter the cooling state A control unit (41) for controlling the switching means (23b) to alternately switch between the dust removal state and the dust removal state is provided, and the first set time and the second set time can be changed.

The suction fan (13) and the exhaust fan (14) are alternately controlled to operate in a cooling state over a first set time and a dust removal state over a second set time. In the cooling state, the suction fan (13) is connected to a dustproof filter. The radiator (12) is cooled by receiving the introduced outside air because it is driven in the direction of sucking outside air from the outside of (7a) to stop driving the exhaust fan (14). At this time, the mixed dust in the introduced outside air is filtered by a dustproof filter (7a) provided upstream of the radiator.
In the dust removal state, driving of the suction fan (13) is stopped, and the discharge fan (14) is driven in a direction to blow dust removal air from the inside to the outside of the dustproof filter (7a), so that the radiator (12) Dust clogged between the cores and dust adhering to the outer surface of the dustproof filter (7a) are discharged outward.

According to a second aspect of the present invention, in the first aspect, the cooling water temperature sensor (42) for detecting the temperature of the cooling water of the internal combustion engine is provided, and the second setting increases as the temperature detected by the cooling water temperature sensor (42) increases. It is characterized in that the time is shortened.
The discharge air blow time is adjusted to be short in response to the water temperature rise.

The invention of claim 3 is the combine according to claim 1 or claim 2, comprising a grain storage device (6) and a grain discharge mechanism (6a) for discharging the kernel in the grain storage device (6). The drive unit structure is characterized in that when the drive state of the grain discharge mechanism (6a) is detected, the switching from the dust removal state to the cooling state is checked.
The clogging of the dustproof filter body (7a) is eliminated when the power load due to the discharge of the grain discharge mechanism (6a) is small.

The invention of claim 4 is the grain storage device (6) and the grain discharge mechanism (6a) for discharging the kernel in the grain storage device (6) in claim 1, 2 or 3 ) With the drive part structure of the combine, and when the driving state of the grain discharging mechanism (6a) is detected, the switching from the dust removing state to the cooling state is restrained to maintain the dust removing state, and the grain discharging When the driving state of the mechanism (6a) is detected and the temperature detected by the cooling water temperature sensor (42) is higher than a set temperature, the switching from the cooling state to the dust removal state is restrained to change the cooling state. It is characterized by having a configuration to maintain.
The clogging of the dustproof filter is eliminated only when the power load due to the discharge of the grain discharge mechanism (6a) is small and the water temperature of the internal combustion motor is not more than a predetermined value.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, a dust removal switch (85) for manually switching from the cooling state to the dust removal state is provided.
The clogging of the dustproof filter is eliminated by turning on the dust removal switch (85).

According to the first aspect of the present invention, the suction fan (13) and the discharge fan (14) are alternately controlled in the cooling state over the first set time and the dust removal state over the second set time. In the state where the drive of 14) is stopped, the suction fan (13) is driven to suck the outside air from the outside to the inside of the dustproof filter (7a), so that the radiator (12) is cooled by receiving the introduced outside air. At this time, the mixed dust in the introduced outside air is filtered by a dustproof filter (7a) provided upstream of the radiator.
In the dust removal state, the suction fan (13) is stopped and the discharge fan (14) is driven to blow dust removal air from the inside to the outside of the dustproof filter (7a), so that the core of the radiator (12) The dust clogged in between and the dust adhering to the outer surface of the dustproof filter (7a) are discharged outward.
In switching between the cooling state and the dust removal state, the suction fan (13) and the exhaust fan (14) are switched between a state in which the driving is stopped and a state in which the suction fan (14) is rotationally driven in a certain direction. It is possible to improve the cooling efficiency of the radiator (12) and to efficiently remove the dust in the dustproof filter (7a).
Moreover, since the driving load at the time of switching can be reduced, the durability of a transmission member such as a transmission belt can be improved.

Therefore, it is possible to avoid a large reverse load required for switching the drive portion of the suction fan having a large rotational inertia to the reverse rotation and driving, and a loss of time until shifting to the exhaust air flow. By appropriately adjusting, it is possible to ensure the cooling efficiency of the internal combustion prime mover in grain harvesting work corresponding to a wide range of field conditions without impairing the durability and heat exchange efficiency of the transmission system.
Further, since the suction fan (13) and the discharge fan (14) are provided coaxially, the dust-proof filter body (7a) and the radiator (12) to which dust is attached by the introduction of outside air by the suction fan (13) are provided. The part can be blown with dust by the discharge fan (14), and dust removal efficiency can be improved.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the second set time is shortened as the temperature of the cooling water becomes higher. When the water temperature becomes high due to a large power load, the clogging of the body is eliminated, and the cooling time of the radiator (12) is promoted by increasing the cooling time by the suction fan (13), thereby overheating the internal combustion engine. Can be prevented.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, the dust filter body (7a) is clogged during the grain discharging operation by the grain discharging mechanism (6a) with less power load. Dust can be removed and overheating of the internal combustion engine can be prevented.

  According to the invention of claim 4, in addition to the effects of the invention of claim 1 or claim 2 or claim 3, the dust filter body (7a) during the grain discharging operation by the grain discharging mechanism (6a) with less power load If the cooling water temperature is high even in the grain discharging operation, the internal combustion prime mover can be maintained by maintaining the suction fan (13) and the discharge fan (14) in a cooled state. Overheating can be more effectively prevented.

  According to the invention of claim 5, in addition to the effects of the inventions of claims 1 to 4, the dust filter body (7 a) is clogged by arbitrarily switching the dust removal state by operating the dust removal switch (85). Since it can be eliminated, it is possible to efficiently clean the maintenance of the prime mover at the end of the cutting operation.

General-purpose combiner side view Top view of the combine of FIG. A longitudinal sectional view showing the internal structure of the heat exchange device Transmission system development diagram Transmission system main part configuration diagram Front view of transmission section in heat exchange operation state Front view of the main part of the transmission section in the exhaust air blowing state Main part configuration diagram of power transmission during supply / discharge operation Block diagram of clutch control system configuration Side view around an elevator with dust removal specifications Dust-elevating elevator main part enlarged side view A view of arrow A in FIG. Figure similar to Figure 12 for the configuration of the inspection lid specifications An enlarged side view of the main part of an elevator with an inspection lid specification Configuration diagram of radiator cover support mechanism in the direction of the support axis Enlarged view of angle restriction member in intermediate angle restriction state Front view (a) and side view (b) of a radiator cover provided with a dustproof screen Enlarged view of dust-proof screen

Embodiments specifically configured based on the above technical idea will be described below with reference to the drawings.
The general-purpose combine 1 which is one application example of the present invention includes a left and right crawlers 3 and 3 that support the vehicle so that it can run on the field, The reaping device 4 for reaping the cereals from the field in the section, the threshing device 5 for threshing the reaped cereals received from the reaping device 4, and the grain storage device for storing the threshing grains on the side of the threshing device 5 6 and a control device 7 arranged in front of the grain storage device 6.

  The reaping device 4 is connected to the threshing device 5 via the elevator 4a, and at the time of grain reaping, the reaping device 4 cuts the stock while the reaping device 4 stirs the grain while traveling by the crawlers 3 and 3 on the left and right sides. Threshed by 5 and stored in the grain storage device 6. Moreover, the grain storage device 6 includes an auger cylinder 6a for discharging the grain, and discharges the stored grain by aligning the position on the truck bed when the stored grain is transshipped. In addition, a heat exchange device for an internal combustion prime mover (not shown) is provided integrally with the control device 7, and a radiator cover 7 a for introducing outside air is provided on the outer surface of the control device 7. The internal combustion prime mover is cooled while blocking the intrusion of dust.

FIG. 3 is a longitudinal sectional view showing the internal configuration of the heat exchange device 11.
The heat exchange device 11 includes a radiator cover 7a having a mesh-like dustproof filter on the outer side of the machine body, a radiator 12 for exchanging heat with the outside air through a shroud 12a disposed on the inner side thereof, and the radiator 12 A suction fan 13 that sucks outside air at the inner side, a discharge fan 14 that blows outward, concentric support shafts 13a and 14a that support the fans 13 and 14 respectively, and transmission parts. Each transmission portion has transmission belts 15b and 16b between pulleys 13c and 14c provided at shaft ends of both support shafts 13a and 14a, and drive pulleys 15a and 16a of the transmission shaft 15 and the reverse rotation shaft 16, respectively. It can be wound and configured to be able to transmit individually.

  Further, as shown in the transmission system development diagram of FIG. 4, the transmission shaft 15 and the reverse rotation shaft 16 receive the engine power from the transmission shaft 15, and from this transmission shaft 15 to the main configuration diagram of the transmission system of FIG. As shown, it is transmitted by a transmission belt 18 that winds the counter shaft 16 c of the reverse rotation shaft 16 and the compressor shaft 17. Further, the transmission belts 15b and 16b of the fans 13 and 14 are provided with tension clutches 21 and 22, respectively, so that individual transmission control is possible.

  As shown in the front view of the transmission portion in the heat exchange operation state by the intake of outside air in FIG. 6, the specific configuration of the transmission portion is such that the support shafts 13a and 14a having the concentric configuration of the fans 13 and 14 are arranged inside the outer cylinder 25a. And is supported by the frame 25 through the outer cylinder 25a. The tension clutches 21 and 22 are supported by the tension arms 31 and 32 so as to be swingable about the fulcrums 31a and 32a, and are connected to the action member 23 acting on the tension arms 31 and 32.

  The tension clutches 21 and 22 will be described in detail. As shown in the front view of the main portion of the transmission portion in the exhaust air blowing operation state of FIG. 7, the tension arms 31 and 32 are respectively provided with guide rods 31b, The springs 31c and 32c are attached to the spring 32b, connected via the springs 31c and 32c, and collars 31d and 32d for restricting the expansion of the springs 31c and 32c for compression are provided on the guide rods 31b and 32b, respectively. The rods 31 b and 32 b are connected to the action member 23. The action member 23 is configured to be able to reciprocate horizontally between two left and right positions by an electric arm 23a driven by a clutch switching motor (switching means) 23b.

  In order to prevent buckling of the springs 31c and 32c and to protect the screws of the guide rods 31b and 32b, a guide tube is provided slidably with respect to the guide rods 31b and 32b and the collars 31d and 32d. , 32d can be overlapped with springs 31c, 32c. Moreover, the hole of the connection part of the tension arms 31 and 32 is formed larger than the outer diameter of the guide tube and smaller than the outer diameter of the collars 31d and 32d.

  Regarding the operation of the tension clutches 21 and 22 having the above-described configuration, as shown in the main configuration diagram of the transmission portion during the intake / exhaust operation in FIG. 8, the action member 23 is the electric arm 23 a in FIG. , The tension clutch 22 of the exhaust fan 14 cuts the transmission power, and the transmission belt 15b transmits the power from the transmission shaft 15 by the tension clutch 21 of the suction fan 13, and the dust removal state is shown in FIG. In FIG. 8B, when the action member 23 moves to the right, the tension clutch 21 of the suction fan 13 cuts the transmission power, and the transmission belt 16 b by the tension clutch 22 of the discharge fan 14 transmits the power from the reverse shaft 16.

  As described above, both the tension clutches 21 and 22 operate in reverse with respect to the two transmission belts 15b and 16b in response to the movement of the action member 23 to the left and right positions by the rotation of the electric arm 23a. As a result, when the suction fan 13 is operated, the radiator 12 receives the introduced outside air and exchanges heat of the cooling water. At this time, the upstream side of the radiator 12 Dust-proof filter 7a interposed in the outer space separates the mixed dust in the introduced outside air into its outer surface, and when the discharge fan 14 is operated, the air blowing direction is discharged from the outside air intake so far to the outside. The dust adhering to the outer surface of the filter body 7a is discharged outward.

  In this case, the transmission portions of the fans 13 and 14 can drive the exhaust fan 14 without difficulty even until the suction fan 13 stops, and the exhaust fan 14 can be quickly exhausted by the operation of the exhaust fan 14. Is started, it is possible to avoid a large reverse load necessary to switch and drive the transmission portion of the suction fan 13 having a large rotational inertia to the reverse rotation, and to the time to shift to the exhaust air blow Loss can be minimized.

(Clutch control)
Next, operation control of the tension clutches 21 and 22 configured as described above will be described.
FIG. 9 is a block diagram of the clutch control system configuration.
It is configured so that the left and right positions of the electric arm 23a by the clutch switching motor (switching means) 23b can be controlled by the control unit 41, and the cooling state and the dust removal state are alternately operated at respective times. Thus, the clutch switching motor 23b is controlled. After switching the electric arm 23a to the cooling state, the suction fan 13 is driven for the first set time and then switched to the dust removal state, and the exhaust fan 14 is driven for the second set time to switch to the cooling state again. This alternate operation control is applied at the time of cutting and threshing operation by the cutting and cutting switch. Moreover, based on the signal of the grain discharge switch 43 which operates the cooling water temperature sensor 42 and the grain discharge auger cylinder 6a of the grain storage device 6, the cooling water temperature of the internal combustion engine is the reference value when discharging the stored grain. A mode in which the discharge fan 14 is continuously operated in the following range is configured to be selectable by the crop mode switch 44.

  Due to the clutch control described above, the engine cooling can be performed while the clogging is kept within a certain range by the alternating operation of the suction and discharge fans 13 and 14 during cutting cutting, and when the grain discharge switch 43 is turned on, The clogging of the radiator 12 can be eliminated while preventing the engine from overheating by extending the operating time of the exhaust fan 14 when discharging the grain with a small engine load. Further, the application of the exhaust fan 14 can be cut by the crop mode switch 44, and by suppressing the operation of the exhaust fan 14, the durability of the transmission belt is improved in correspondence with crops with little dust adhering to the radiator cover 7a. Can be achieved.

  As another example of the alternate operation control, the crop mode switch 44 can be selected from a plurality of patterns set for the alternate operation time of the suction fan 13 and the discharge fan 14 to thereby dispose the dust on the radiator cover 7a by the crop. In addition to preventing overheating of the engine and improving the durability of the transmission belt in accordance with the degree of adhesion, as another example of alternate operation control, the operation time of the exhaust fan 14 (the dust removal state) as the engine water temperature increases. ) May be configured to be short. In addition, by providing the dust removal switch 85 that continuously operates the discharge fan 14, the radiator core can be cleaned at the end of the cutting operation, so that interruption of the cutting operation due to unexpected clogging can be avoided, By providing a time setting unit and changing the discharge time as appropriate, the cooling efficiency of the internal combustion engine in grain harvesting operations can be secured for a wide range of field conditions without compromising the durability and heat exchange efficiency of the transmission system. Can do.

(Mowing elevator)
Next, the dust removal structure in the elevator of the reaping device will be described.
FIG. 10 is a side view around the elevator of the dust removal specification. The elevator 4a is configured by attaching a dust removal unit 51 to the elevator 4a as a dust-exhaust specification configuration in which the dust is sucked and discharged while conveying the harvested grain to the threshing portion while tilting backward from the harvesting device 4. In place of this dust removal unit 51, the inspection lid described later can be shared with an inspection lid specification that is detachable. In order to improve production costs including space efficiency, it is common to all specifications. Configure to be compatible.

  More specifically, as shown in the enlarged side view of the main part of the elevator of the dust removal specification shown in FIGS. 11 and 12 and its A arrow view, the main body of the dust removal unit 51 is inserted from the upper surface of the elevator 4a. Screw holes 53 and 54 for fixing bolts are formed in the opening 52 and the upper and lower portions of the inclined surface sandwiching the opening 52, so that the exhaust duct 51a of the dust removal unit 51 is along the outer surface of the elevator 4a. Determine the location.

  Further, as shown in FIG. 12 showing the configuration of the inspection lid specification in FIG. 13 and an enlarged side view of the main part in FIG. 14, the inspection lid 61 is sized to cover the opening 52 formed on the upper surface of the elevator 4a. An engagement hole 62 at the inclined upper end and a spring clamp 63 at the inclined lower end are provided. On the upper surface of the elevator 4a, a locking stud 64 made of a collar and a bolt is provided in the upper screw hole 53, and the inspection lid 61 is engaged. The mounting portion of the inspection lid 61 is configured so that it can be locked by the hole 62, and the hook plate 66 provided with a hook 65 for fixing the spring clamp 63 can be bolted to the lower screw hole 54.

  The elevator 4a configured in this way is configured as an inspection lid specification that can be attached and detached with one touch by a locking stud 64 and a hook plate 66 fastened and fixed to the upper surface bolt holes 53 and 54, and the locking stud 64 and Instead of the hook plate 66, the dust removal unit 51 is bolted to the upper surface bolt holes 53, 54 of the elevator 4a so as to be configured as dust removal specifications. .

  Further, in the elevator 4a, a reinforcing member 67 and an opening 52a are provided on the inclined upper portion of the opening 52, a hook 65a similar to the hook 65 is attached to the reinforcing member 67, and a bolt hole 53a is formed on the inclined upper portion of the opening 52a. The locking stud 64 is fastened, and the inspection lid 61a for maintenance with one-touch attachment and detachment provided with the spring clamp 63 and the engagement hole 62a as described above can be constituted by a common fixing member adjacently.

(Radiator cover)
Next, a support mechanism for the radiator cover will be described.
FIG. 15 is a configuration diagram of the support mechanism of the radiator cover in the support axis direction. The radiator cover 7a is supported at its lower end on a support shaft 71 so that it can be unfolded and rotated so as to fall outward from the upper end side, and its angle of rotation can be held at the middle position of the open state. The member 72 is connected to the fulcrum 73 of the radiator cover 7a.

  Specifically, as shown in the enlarged view of the intermediate angle restriction state in FIG. 16, the angle restriction member 72 forms a groove for guiding the fixed pin 74 provided on the machine body within a certain range, and the groove is vertically parallel. The two guide grooves 75 and 76 in the arrangement and a transition groove 77 connecting the two in the vertical direction are formed in a stepped shape, and the transition groove 77 is formed immediately before the terminal portion of the upper guide groove 75 from the lower guide groove 76. Connected to the beginning of

  When the radiator restricting member 72 in the fully closed position is opened so as to be tilted outward by the angle restricting member 72 having the above-described configuration, the restriction by the fixing pin 74 acts at the terminal position of the upper guide groove 75 to bring it into the middle open state. The fixing pin 74 enters the lower guide groove 76 from the transition groove 77 and is fixed at its end position by performing a release operation to return the radiator cover 7a to the closing direction while jumping up the angle regulating member 72. The restriction by the pin 74 acts to keep the fully opened state. In addition, the closing operation can be fully closed by a continuous operation, in addition to being held in an intermediate open state by an intermediate operation stop.

  As described above, since the radiator cover 7a is reliably held at the middle position when the radiator cover 7a is opened outward by the two-stage action type angle regulating member 72, it is safe to open carelessly. In addition, the radiator cover 7a can be reliably rotated to the fully opened position through the release operation by the operator so that the entire interior of the machine can be inspected, and the operation load of the operator can be distributed by the closing interruption operation in the middle open state. And safe full-close operation.

  The angle restricting member 72 is configured to be heavy at the inner portion where the lower guide groove 76 is provided to increase the rotational moment of the angle restricting member 72 due to its own weight, thereby causing an unexpected full opening operation due to entry into the transition groove 77. Thus, intermediate regulation by the end of the upper guide groove 75 can be secured.

(Dust-proof screen)
Next, a combine dust screen will be described.
FIG. 17 is a front view (a) and a side view (b) of a radiator cover provided with a dustproof screen. By providing gears 82 and 82 that mesh with each other vertically, and attaching dust-proof screens 83 and 83 for restricting ventilation to the inside of the dust-proof net of the radiator cover 7a, both the gears 82 and 82 are partially restricted in ventilation. In order to periodically remove the dust adhered to the dust-proof net by ventilation, the ventilation restriction area by the dust-proof screens 83 and 83 is configured to be rotatable. Both dustproof screens 83 and 83 are formed to have a maximum outer diameter with an angle difference of 90 ° in order to widen the dustproof area.

  As shown in a single enlarged view of FIG. 18, the two dustproof screens 83 and 83 are formed by reducing the width dimension of the portion B in the vicinity of the rotation center 83a, so that the area of the permanent ventilation restriction area C of the rotation center 83a. The dustproof effect can be ensured by minimizing. In this case, the strength can be ensured by providing attachment portions 84, 84 at the wide portions of the dustproof screens 83, 83 and attaching them to the gears 82, 82.

1 General-purpose combine 4 Harvesting device 5 Threshing device 6a Auger tube (grain discharge mechanism)
6 Grain storage device 7a Radiator cover (dust filter)
11 Heat Exchanger 12 Radiator 13 Suction Fan 14 Exhaust Fan 15b Transmission Belt (Transmission Section)
15 Transmission shaft 16 Reverse rotation shaft 16c Counter shaft 16b Transmission belt (Transmission section)
17 Compressor shaft 18 Transmission belt 21 Tension clutch 22 Tension clutch 23 Action member 23a Electric arm 23b Clutch switching motor (switching means)
31, 32 Tension arm 31b, 32b Guide rod 31c, 32c Spring 31d, 32d Color 41 Control unit 42 Cooling water temperature sensor 43 Grain discharge switch 44 Crop mode switch 85 Dust removal switch

Claims (5)

A suction fan (13) for sucking outside air from the outside of the machine body is disposed inside the radiator (12) for exchanging heat of the cooling water of the internal combustion engine, and is sucked by the suction fan (13) to the outside of the radiator (12). In the power source structure of the combine equipped with a dustproof filter (7a) for filtering dust in the outside air,
A discharge fan (14) that rotates concentrically with the rotation axis of the suction fan (13) is provided at a site inside the suction fan (13), and the drive of the discharge fan (14) is stopped in a state where the drive is stopped. Driving the suction fan (13) to drive the exhaust fan (14) in a cooling state in which outside air is sucked from the outside to the inside of the dustproof filter body (7a) and driving of the suction fan (13) is stopped. And a switching means (23b) for selectively switching the dust removal state in which dust removal air is blown from the inside to the outside of the dustproof filter body (7a), and the dust removal state after maintaining the cooling state for a first set time. A control unit (41) for controlling the switching means (23b) to switch between the cooling state and the dust removal state alternately after the dust removal state is maintained for the second set time and then returned to the cooling state. Provided Driving unit structures combine, characterized in that the change configurable one set time and the second set time.   A cooling water temperature sensor (42) for detecting the temperature of the cooling water of the internal combustion engine is provided, and the second set time is shortened as the temperature detected by the cooling water temperature sensor (42) increases. The structure of the motive part of the combine according to claim 1.   A prime mover structure of a combine comprising a grain storage device (6) and a grain discharge mechanism (6a) for discharging the grains in the grain storage device (6), wherein the grain discharge mechanism (6a) 3. The combine driving section structure according to claim 1, wherein when the driving state is detected, the switching from the dust removal state to the cooling state is suppressed.   A prime mover structure of a combine comprising a grain storage device (6) and a grain discharge mechanism (6a) for discharging the grains in the grain storage device (6), wherein the grain discharge mechanism (6a) When the driving state is detected, the switching from the dust removing state to the cooling state is restrained to maintain the dust removing state, the driving state of the grain discharging mechanism (6a) is detected, and the cooling water temperature sensor (42) 3. The structure according to claim 1, wherein the cooling state is maintained by restraining switching from the cooling state to the dust removal state when the temperature detected by the step is higher than a set temperature. 3. The structure of the prime mover of the combine described in 3.   The structure of the motive part of the combine according to any one of claims 1 to 4, further comprising a dust removal switch (85) for manually switching from the cooling state to the dust removal state.

Images