JP2006262753A - Engine cooler for harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine cooler for a harvester that can suitably cool the engine as the temperature rise of the engine-cooling water is suppressed. <P>SOLUTION: In the normal wind mode where the air is allowed to pass through the dust-removing net 26 toward the engine-cooling part 20, when the ventilation controlling means tells the poor draft state based on the detection information from the draft state detecting means F that detects the draft state after passing through the dust-removing 26, the normal wind mode is turned to the reverse wind mode to turn the air flow to the reverse direction and control the actuation of the ventilation means A. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention provides a normal wind mode for passing air to the engine cooling section through a dust removal net, and a ventilation means configured to be switchable between a reverse wind mode in which the normal wind mode is reversed and the air flow is passed through the dust removal net. ,
The present invention relates to an engine cooling device for a harvester provided with ventilation control means for controlling the operation of the ventilation means.

  The above-described engine cooling device for the harvesting machine normally cools the engine in the normal wind mode. However, when dust such as sawdust adheres to the dust removal net, the dust removal net is switched to the reverse wind mode. Conventionally, the ventilation control means executes the forward wind mode for the set time for the forward wind and then executes the reverse wind mode for the set time for the reverse wind. It was comprised so that it might repeat (for example, refer patent document 1).

JP 2001-263063 A

  Conventionally, the forward wind mode and the reverse wind mode are switched based on a preset forward wind setting time or a reverse wind setting time, so switching from the normal wind mode to the reverse wind mode causes dust to accumulate on the dust removal net. However, there is a risk that engine cooling cannot be performed properly, and there is a risk that switching from the normal wind mode to the reverse wind mode will not cause dust to accumulate on the dust removal net. In this case, although it is desired to maintain the forward wind mode as much as possible for cooling the engine, the engine is unnecessarily switched to the reverse wind mode. There is a risk that the cooling cannot be performed properly.

  By the way, in order to prevent the switching from the normal wind mode to the reverse wind mode even though no dust is accumulated on the dust removal net, the engine cooling water temperature rises above the appropriate temperature in the normal wind mode. It is possible to switch to the reverse wind mode because dust is accumulated on the dust removal net, but in this case, the temperature of the engine cooling water that appears as a result of the accumulation of dust on the dust removal net and continued lack of cooling capacity Since the switching to the headwind mode is performed based on the rise, the switching timing is slow, and in addition, even in the headwind mode, it is predicted that the engine coolant temperature will continue to rise due to insufficient cooling capacity. Therefore, it is difficult to put into practical use.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an engine cooling device for a harvester that can appropriately perform engine cooling while suppressing an increase in engine coolant temperature. The point is to provide.

The engine cooling device of the harvesting machine of the present invention can be switched between a normal wind mode for passing air through the dust removal net toward the engine cooling section and a reverse wind mode for passing the air through the dust removal net with the air flow direction reversed. Ventilation means configured in
A ventilation control means for controlling the operation of the ventilation means,
The first characteristic configuration is
Ventilation state detection means for detecting the ventilation state through the dust removal net is provided,
The ventilation control means is configured to control the operation of the ventilation means in the form of switching to the reverse wind mode when the poor ventilation state is determined based on the detection information of the ventilation state detection means in the forward wind mode. It is in.

According to the first characteristic configuration, the ventilation state in the forward wind mode is detected by the ventilation state detection means for detecting the ventilation state through the dust removal net, and the operation control means detects the detection information of the ventilation state detection means in the forward wind mode. When the poor ventilation state is determined based on the above, the ventilation means is switched from the normal wind mode to the reverse wind mode.
Incidentally, as the ventilation state detection means, in addition to detecting the flow rate of air flowing through the dust removal net, an optical detection means for detecting the light transmission amount of the dust removal net is provided to detect the light transmission of the dust removal net. The poor ventilation state may be determined based on the amount.

  Therefore, in the normal wind mode, the poor ventilation state is determined based on the detection information of the ventilation state detecting means for detecting the ventilation state through the dust removal net, and the normal wind mode is switched to the reverse wind mode. As a result, it becomes possible to switch to the headwind mode accurately, and as a result, the poor ventilation state continues and engine cooling cannot be performed properly, or it is not in the poor ventilation state. An engine cooling device for a harvesting machine that can appropriately perform engine cooling while preventing the engine cooling water temperature from rising by avoiding that engine cooling cannot be performed properly by switching to the reverse wind mode. I came to get.

In addition to the first feature configuration, the second feature configuration of the present invention includes:
The ventilation control means is configured to control the operation of the ventilation means in the form of switching to the normal wind mode when the good ventilation state is determined based on the detection information of the ventilation state detection means in the reverse wind mode. It is in.

  According to the second characteristic configuration, when the ventilation state through the dust removal net is detected by the ventilation state detection unit in the headwind mode, and the ventilation control unit determines the ventilation good state based on the detection information of the ventilation state detection unit. , Switching to the normal wind mode.

  Therefore, the good ventilation state is determined based on the detection information of the ventilation state detecting means for detecting the ventilation state through the dust removal net in the reverse wind mode, and the normal wind mode is switched to the reverse wind mode. As a result, it will be possible to switch to the normal wind mode accurately, and as a result, the engine will not be able to properly cool the engine by continuing the reverse wind mode unnecessarily despite the good ventilation condition. In addition, an engine cooling device for a harvester that can perform engine cooling more appropriately by avoiding that engine cooling cannot be performed properly by switching to the normal wind mode even though the ventilation is not good is obtained. It came to.

In addition to the first feature configuration or the second feature configuration, the third feature configuration of the present invention includes:
The ventilating control means is configured to control the operation of the ventilating means in such a manner that the mode is switched to the normal wind mode when an elapsed time after switching to the headwind mode reaches a set time for headwind operation. The engine cooling device of the harvester according to 1.

  According to the third characteristic configuration, the operation control means switches to the normal wind mode when the elapsed time after switching to the head wind mode reaches the set time. By the way, by experimentally obtaining the time required to blow off and removing dust in the headwind mode and setting the set time corresponding to that time, it is possible to properly remove dust attached to the dust removal net. It will be easy to do.

  Therefore, since switching from the headwind mode to the headwind mode is performed based on the elapsed time since switching to the headwind mode, it is possible to switch to the headwind mode with a simple configuration that measures the elapsed time, In the form of simplifying the configuration, an engine cooling device for a harvester that can appropriately perform engine cooling has been obtained.

In addition to any one of the first feature configuration to the third feature configuration, the fourth feature configuration of the present invention includes:
The ventilation means includes a cooling fan that switches between the normal wind mode and the reverse wind mode by reversing the direction of the ventilation blades with respect to the hub that is rotationally driven in one direction.

  According to the fourth characteristic configuration, the cooling fan provided in the ventilation means is configured to switch between the normal wind mode and the reverse wind mode by reversing the direction of the ventilation blades with respect to the hub that is rotationally driven in a certain direction. For example, as compared with the case where the ventilation means is configured to switch between the forward wind mode and the reverse wind mode by switching the driving direction of the cooling fan having the ventilation blades of a fixed posture on the hub between the forward rotation direction and the reverse rotation direction. Therefore, it has become possible to obtain a cooling device for a harvester that can appropriately perform engine cooling in a form that simplifies the configuration.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, a self-removing combine that is an example of a harvesting machine is planted cereal at the front of a machine frame 1 having a pair of left and right crawler type traveling devices 2 at the lower part as it travels. The harvesting and conveying unit 3 that harvests the straw and transports it to the left rear while changing the posture to the left-right orientation is connected so as to be able to swing up and down. The threshing device 4 to be performed, the grain tank 5 for storing the grain from the threshing device 4, and the boarding operation unit 6 are configured to be mounted on the body frame 1.

  The grain tank 5 is provided with a screw-type discharge mechanism 7 for discharging the grain stored therein to the outside of the machine. The discharge mechanism 7 is configured to be capable of turning and ascending and descending with a lifting screw 8 standing at a rear portion of the grain tank 5 as a fulcrum.

  The boarding operation unit 6 includes a boarding step 9, a front panel 10 erected immediately before the boarding step 9, a control lever 11 for turning operation and for raising / lowering the cutting and conveying unit provided in the front panel 10, boarding A side panel 12 erected immediately on the left side of step 9, a main transmission lever 13 and a sub transmission lever 14 provided on the side panel 12, and a driver's seat 15 disposed behind the boarding step 9. ing.

  As shown in FIGS. 3 and 4, a driving portion 16 is provided inside an engine bonnet 17 for placing and supporting the driver seat 15. The prime mover 16 is a water-cooled engine 19 that is mounted on the body frame 1 in a lateral orientation in which the output shaft 18 is horizontally oriented, and an engine cooling unit that is erected on the right outer side of the engine 19. The radiator 20 is connected to the output shaft 18 of the engine 19 via a belt-type transmission mechanism 21 and is driven to rotate in a fixed direction. The cooling fan 22 is disposed between the engine 19 and the radiator 20. Yes.

  The right side wall 23 of the engine bonnet 17 is formed in a hollow structure including an air guide path 24, and includes an intake port 27 in which a dust removal net 26 is stretched on the outer surface 25, and the inner surface 28 communicates with the radiator 20. It is formed in a state having a mouth 29. Then, by the suction action of the cooling fan 22, clean outside air from which dust or the like has been filtered and removed by the dust removal net 26 is supplied to the radiator 20, the engine 19, or the like as cooling air.

  As shown in FIGS. 3 and 4, the belt type transmission mechanism 21 includes an output pulley 30 attached to the output shaft 18, a first input pulley 33 attached to the input shaft 32 of the generator 31, and a pump of the water pump 34. A second input pulley 36 mounted on the shaft 35 and a transmission belt 37 hung over the pulleys 30, 33, 36 are provided.

  As shown in FIG. 5, the second input pulley 36 is formed in a cylindrical shape with the central portion 38 bulging outward so that the central portion 38 has an internal space that allows the water pump 34 to enter. The bulging end portion of the sheet metal is connected to the first rotating body 39 fixed to the protruding end of the pump shaft 35 by four bolts 40. By driving the water pump 34 by the rotation of the second input pulley 36, the cooling water is circulated between the cooling water jacket (not shown) provided in the engine 19 and the radiator 20.

  A normal wind mode in which the ventilation means A including the cooling fan 22 sucks outside air through the dust removal net 26 and supplies the air to the radiator 20, and the normal wind mode reverses the direction of ventilation and passes through the dust removal net 26. The configuration can be switched to the reverse wind mode to be performed, and the configuration will be described below.

As shown in FIGS. 4 and 5, the cooling fan 22 has a hub 41 that is driven to rotate together with the pump shaft 35 with the axis P1 of the pump shaft 35 as a rotation axis, and a rotation axis P1 around the hub 41. 7 wind-up blades 42 as ventilation blades for generating wind by integral rotation.
The hub 41 is formed in a bowl shape having a recessed space in the center thereof, and seven boss-shaped first support portions 43 are formed on the outer periphery thereof at a predetermined interval in the circumferential direction. The support shaft portion 44 of the wind-up blade 42 is supported by each of the first support portions 43 through a metal bearing 45 so as to be rotatable around an axis P2 set in a direction orthogonal to the rotation axis P1. Yes.

In the recessed space of the hub 41, a second rotating body 46 connected to the first rotating body 39 by the four bolts 40 so as to rotate together with the second input pulley 36 is provided. At the center of the body 46, a support shaft 47 having a circular cross-section disposed with its axis aligned with the axis P1 of the pump shaft 35 is press-fitted so as to rotate integrally with the second rotating body 46. So that the central portion of the hub 41 can be slid relative to the support shaft 47 in the direction along the rotational axis P1 with a high fitting accuracy in which tilting due to backlash is suppressed. 48 is fitted and supported.
An O-ring 49 serving as a seal member for preventing foreign matter from entering between the center portion of the hub 41 and the support shaft 47 on the outer side of the collar 48 between the center portion of the hub 41 and the support shaft 47. Is inserted.

  At the center of the hub 41, four holes 50 for bolt operation are formed with a predetermined interval in the circumferential direction, and the lid body closes the holes 50 and prevents the O-ring 49 from coming off. 51, and a pair of the hub body 41 and the spring receiver 52 that is bolted to the support shaft 47 together with the lid body 51 to bias the hub 41 toward the second input pulley 36. The compression spring 53 is interposed.

  As shown in FIGS. 5 and 8, four interlocking shafts 55 for rotating the hub 41 by the rotation of the second rotating body 46 are provided on the outer peripheral portion of the second rotating body 46. The four interlocking shafts 55 are provided in the central portion of the hub 41 at predetermined intervals in the circumferential direction, and four through-holes 54 are formed in the circumferential direction at predetermined intervals. Are inserted in a direction along the rotational axis P1 so as to be slidable relative to each other. As shown in FIG. 10, collars 56 are fitted in the respective through holes 54, and the interlocking shafts 55 are inserted into the through holes 54 due to manufacturing errors between the collars 56 and the corresponding interlocking shafts 55. In order to avoid defects, a relatively large gap is formed, and an O-ring 57 that prevents foreign substances from entering between each through hole 54 and the corresponding interlocking shaft 55 is fitted. The O-ring 57 is prevented from coming off by a ring-shaped pressing metal fitting 58 screwed to the hub 41.

A swing arm 59 swinging around its axis P2 is fixed to the support shaft portion 44 of each wind-generating blade 42, and each swing arm 59 is directed to the second rotating body 46 at its free end. The linking pins 60 projecting from each other are provided, and a linking mechanism 61 is constituted by the swinging arms 59, the linking pins 60, and the like.
Seven groove portions 62 along the circumferential direction are formed in the outer edge portion of the second rotating body 46 so as to be spaced apart from each other by a predetermined interval in the circumferential direction. The portion corresponding to the space between the groove portions 62 on the outer peripheral portion of the two-rotor 46 is recessed so as to allow the nut 63 that fastens the swing arm 59 to the support shaft portion 44 of each wind-generating blade 42. Is formed.

In other words, the second rotating body 46 is provided in the recessed space of the hub 41, and the second rotating body is effectively utilized by utilizing the gap between the outer peripheral portion of the hub 41 and the outer peripheral portion of the second rotating body 46 in the recessed space. As the hub 41 is displaced forward and backward in the direction along the rotational axis P1 with respect to 46, a linkage mechanism 61 is provided for changing the attitude of each of the wind blades 42 around their axis P2. The cooling fan 22 can be made compact while the attitude of each of the blast blades 42 can be changed around the axis P2.
In addition, between the 2nd input pulley 36 and the 2nd rotary body 45, the positioning in the direction in alignment with the rotating shaft center P1 of the 2nd input pulley 36, or the removal | extraction to the 2nd input pulley 36 side of each drive shaft 54 is carried out. A spacer 64 for stopping and the like is interposed.

  As shown in FIGS. 5 and 9, a support member 66 that supports the shift fork 65 so as to be swingable in the direction along the rotation axis P <b> 1 is bolted to the front portion of the engine 19. The pair is provided with a pair of left and right bolts 68 so that a cylindrical moving member 67 surrounding the central portion 38 of the second input pulley 36 can change the attitude of the pair of bolts 68 relative to the shift fork 65. The second support portion 69 (see FIG. 8) formed on the outer peripheral portion of the hub 41 is supported by the moving member 67 via a radial bearing 70 in a pivotally supported state.

In other words, the hub 41 is supported by the support shaft 47 via the collar 48 and the outer peripheral portion thereof is supported by the moving member 67 via the radial bearing 70, with the swing of the shift fork 65. Thus, it is configured to be displaced together with the moving member 67 in the direction along the rotation axis P1.
The hub 41 is screwed with a ring-shaped pressing metal 71 that supports and fixes the second support portions 69 of the outer periphery to the radial bearing 70.

  As shown in FIGS. 3 and 4, the upper end of the shift fork 65 is linked via a release wire 72 to a sector gear 74 supported on the rear wall 73 of the engine bonnet 17 so as to be swingable on the front and rear axis P3. The sector gear 74 is meshed with an output gear 76 of an electric motor 75 that can be switched between forward and reverse rotation with a reduction gear disposed on the rear wall 73 of the engine bonnet 17.

When the sector gear 74 is driven to swing rightward around the front and rear axis P3 by the power from the electric motor 75, the release wire 72 is pulled by the swing and the shift fork 65 is rotated by the rotation shaft. By swinging in the direction along the center P1, the hub 41 together with the moving member 67 resists the urging force of the compression spring 53, and moves rightward along the rotational axis P1 with respect to the second rotating body 46. Due to this displacement, the attitude of each wind-up blade 42 is changed from the normal wind operation position (see FIG. 7B) to the reverse wind operation position (see FIG. 7A).
Further, when the sector gear 74 is driven to swing leftward about the front / rear axis P3 by the power from the electric motor 75, the pulling operation by the pull wire 72 is released and the hub 41 is compressed. With the bias of the spring 53, the moving member 67 and the second rotating body 46 are displaced leftward along the rotational axis P1 with respect to the second rotating body 46. By this displacement, the posture of each wind-up blade 42 is changed to the back wind operating position. (See FIG. 7 (a)) is changed to the normal wind operation position (see FIG. 7 (b)).
Further, an angle sensor S3 comprising a rotary potentiometer is provided as an operation position detecting means for detecting the swing angle of the sector gear 74 around the front and rear axis P3 as the operation position of each of the wind blades 42 by the electric motor 75. It has been.

That is, the compression spring 53, the shift fork 65, the moving member 67, the release wire 72, the sector gear 74, the electric motor 75, and the like are used to operate the hub 41 with respect to the second rotating body 46 by the operation of the electric motor 75. An operation mechanism 77 is configured as a switching operation means for displacing in the direction along P1, and the operation position of each of the wind blades 42 with respect to the hub 41 can be changed by the displacement of the hub 41 with respect to the second rotating body 46 by the operation mechanism 77. The operation position is detected by the angle sensor S3.
The ventilation means A causes the normal air mode F to flow to supply the outside air taken in from the intake ports 27 of the engine bonnet 17 to the radiator 20, the engine 19, and the like, and cools them. The dust adhering to the dust removal net 26 on the right side wall 23 is blown off by the hot air discharged from each of the 17 intake ports 27 and removed from the dust removal net 26.

Next, a control configuration for automatically switching the ventilation means A between the normal wind mode and the reverse wind mode will be described.
As shown in FIG. 11, a microcomputer-based control device 78 is provided as ventilation control means for controlling the operation of the ventilation means A, and this control device 78 detects the ventilation state through the dust removal net 26. On the basis of the detection information of the optical sensor F as the ventilation state detection means, when the ventilation failure state is determined in the forward wind mode, it is switched to the reverse wind mode, and when the ventilation good state is determined in the reverse wind mode, the ventilation means is switched to the normal wind mode. It is comprised so that the action | operation of A may be controlled.

  In addition, the detection information of the optical sensor F and the detection information of the angle sensor S3 described above are input to the control device 78, and the control operation state and non-operation by the main switch S4. Switched to the state. By the way, when the main switch S4 is operated to the on position, it enters a state in which power is supplied to various electric devices mounted on the aircraft, and when operated to the off position, the power supply to the various electric devices is stopped and operated to the start position. The engine 19 is started by an engine starter (not shown).

  When the control device 78 switches the ventilation means A from the normal wind mode to the reverse wind mode, the transmission motor 75 is reversely operated so that the detection information (detection value) of the angle sensor S3 becomes the target value for the reverse wind. Conversely, when the ventilation means A is switched from the reverse wind mode to the normal wind mode, the transmission motor 75 is operated in reverse so that the detection information (detected value) of the angle sensor S3 becomes the target value for the forward wind.

As shown in FIG. 3, the optical sensor F as the ventilation state detecting means is provided on the inner surface portion 28 of the bonnet 17 and on the outer surface portion 25 of the bonnet 17 and from the light emitting portion 81. The light receiving unit 82 that receives light and outputs a larger detection value as the amount of received light is configured as a main part. When dust adheres to the dust removal net 26 and the ventilation state is poor, the light receiving unit 82. Therefore, the detection value output from is reduced. In the figure, reference numeral 83 denotes a protective cover for the light receiving unit 82.
Therefore, when the detected value of the optical sensor F becomes smaller than the setting value for determining the poor ventilation in the normal wind mode, the control device 78 determines that the ventilation is defective. In the reverse wind mode, the control value of the optical sensor F is the ventilation value. If the value is larger than the set value for good determination, it is determined that the ventilation is good. Incidentally, the set value for determining good ventilation is naturally set to a value larger than the set value for determining poor ventilation.

The control operation of the control device 78 will be described based on the flowchart of FIG. 12. When the main switch S4 is turned on, the control operation is started. First, the normal wind mode switching process for switching the ventilation means A to the normal wind mode. (# 1) is executed. Thus, when the main switch S4 is turned on, the mode is switched to the normal wind mode in order to avoid the engine cooling from being insufficient as much as possible by setting the normal wind mode immediately after the engine 19 is started. .
In the normal wind mode, when a poor ventilation state is determined based on the detection information of the optical sensor F (# 2), a reverse wind mode switching process (# 3) for switching the ventilation means A to the reverse wind mode is executed. After that, that is, in the reverse wind mode, when the good ventilation state is determined based on the detection information of the optical sensor F (# 4), the forward wind mode switching process (# 1) for switching the ventilation means A to the normal wind mode is executed. Thus, based on the detection information of the optical sensor F, switching between the normal wind mode and the reverse wind mode is performed.

[Another embodiment]
Hereinafter, other embodiments are listed.

(1) In the above embodiment, when the poor ventilation state is determined in the forward wind mode based on the detection information of the ventilation state detection means F that detects the ventilation state through the dust removal net 26, the mode is switched to the reverse wind mode, and the ventilation is performed in the reverse wind mode. When the good state is determined, the case where the operation of the ventilation means A is controlled by switching to the normal wind mode is exemplified. Instead, the detection of the ventilation state detection means F for detecting the ventilation state through the dust removal net 26 Based on the information, if the ventilation failure state is determined in the normal wind mode, the ventilation mode is changed to the reverse wind mode, and when the elapsed time after switching to the reverse wind mode reaches the set time for the reverse wind operation, the ventilation means A is switched to the normal wind mode. You may comprise so that the action | operation of may be controlled. The control operation of the control device 78 as the ventilation control means in the case of this configuration is as shown in FIG. 13, and it is determined whether or not the set time has passed in the headwind mode instead of the process of # 4 in FIG. When the set time has elapsed (# 5), the normal wind mode switching process (# 1) is executed.

(2) In the above embodiment, as the ventilation means A that changes the ventilation direction between the normal wind mode and the reverse wind mode, the cooling fan having a structure in which the direction of the blade is reversed with respect to the hub that is rotationally driven in a certain direction is used. Instead of such a configuration, it is also possible to use a configuration in which the forward rotation mode and the reverse wind mode are displayed by switching the driving rotation direction of the cooling fan in which the posture of the blade is fixed to normal and reverse.

(3) In the above embodiment, as the ventilation means A that changes the ventilation direction between the normal wind mode and the reverse wind mode, the single cooling fan is switched between the normal flow state and the reverse flow state. A dedicated cooling fan and a cooling fan dedicated to dust removal that provides a headwind mode can be provided, and these can be used separately.

(4) In the above embodiment, the case where a water-cooled engine is used as an engine has been exemplified. However, the present invention can also be applied to a small harvester equipped with an air-cooled engine. It is supplied directly around the cylinder of the engine as a cooling unit.

(5) In the above embodiment, the cooling fan is driven by the power of the engine. However, the radiator can be cooled by a cooling fan driven by an electric motor. As the ventilation means A that changes the ventilation direction to the reverse wind mode, the rotation direction of the cooling fan can be switched by forward / reverse control of the electric motor.

(6) As the ventilation state detection means for detecting the ventilation state through the dust removal net, instead of using an optical sensor, the ventilation speed of the air ventilated by the ventilation means is changed to a hot-wire anemometer or a pitot tube type anemometer. Alternatively, it may be detected by a Karman vortex anemometer so as to determine the ventilation state, or the image of an imaging means for imaging the dust removal net may be evaluated to determine the ventilation state.

Combine side view Overall plan view of combine Partial vertical section rear view of the prime mover Longitudinal side view of the prime mover Longitudinal rear view of the main part showing the configuration of the cooling fan Partial longitudinal rear view of the main part showing the normal wind occurrence state and the reverse wind occurrence state Plan view of the main part showing the normal wind occurrence posture and the reverse wind occurrence posture of the wind blade Longitudinal side view of the main part showing the configuration of the cooling fan Longitudinal side view of the main part showing the configuration of the operating mechanism Enlarged vertical side view showing the structure of the center of the cooling fan Block diagram showing control configuration Flow chart showing control operation The flowchart which shows the control action of another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 Engine cooling part 22 Cooling fan 26 Dust removal net | network 41 Hub 42 Ventilation blade 78 Ventilation control means A Ventilation means F Ventilation state detection means

Claims (4)

A draft mode configured to be able to switch between a normal wind mode for ventilating the engine cooling section through the dust removal net, and a reverse wind mode for allowing the draft direction to be reversed and passing the dust through the dust net;
An engine cooling device for a harvester provided with ventilation control means for controlling the operation of the ventilation means,
Ventilation state detection means for detecting the ventilation state through the dust removal net is provided,
The harvesting means configured to control the operation of the ventilation means in a form of switching to the reverse wind mode when the poor ventilation state is determined based on the detection information of the ventilation state detection means in the forward wind mode. Engine cooling device.   The ventilating control means is configured to control the operation of the ventilating means in such a manner that when the good ventilation state is determined based on the detection information of the ventilating state detection means in the reverse wind mode, the mode is switched to the normal wind mode. Item 1. An engine cooling device for a harvesting machine according to Item 1.   The ventilating control means is configured to control the operation of the ventilating means in such a manner that the mode is switched to the normal wind mode when an elapsed time after switching to the headwind mode reaches a set time for headwind operation. The engine cooling device of the harvester according to 1.   The said ventilation means is provided with the cooling fan which switches to the said normal wind mode and the said back wind mode by reversing the direction of a ventilation blade with respect to the hub rotationally driven by one direction, The 1-3. The engine cooling device for a harvester according to any one of the above.

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