JP6187504B2 - Driving part of work vehicle - Google Patents

Description

  The present invention relates to a prime mover for a working vehicle that removes dust and dust adhering to a filter installed outside a radiator and prevents engine overheating.

  Conventionally, a water-cooled engine is used in a work vehicle such as a combine. The cooling water whose temperature has been raised by the engine is cooled by circulating through the radiator, and then circulates through the engine again.

  Combine is a process of harvesting, threshing, sorting, and rejecting cereals, and the front reaping device generates swarf and dust by cutting and transporting napped cereals, and threshing from the rear. Since the waste and dust generated by the waste cutting process after threshing are discharged, a large amount of waste and dust are wound around the combine body. If the wound sawdust etc. adhere to the filter body mounted on the cover of the engine room and these filter bodies are clogged, it will not be possible to inhale sufficient outside air from the outside of the filter body to the inside, The cooling efficiency of the radiator decreases, and in some cases, the engine may overheat.

  In order to solve the above problem, Patent Document 1 discloses that the rotation direction of a fan provided inside a radiator is switched between a normal rotation direction and a reverse rotation direction by moving a tension operation body, and the blowing direction by the fan is set as a suction direction. A configuration has been proposed in which switching is made in the blowing direction to cool the radiator and remove dust, dust and the like adhering to the filter of the engine room cover.

Japanese Patent Laid-Open No. 2001-263063

  However, in the configuration disclosed in Patent Document 1, the blowout of the inside air during the reverse rotation of the fan is compared with the intake amount of the outside air into the engine room during the normal rotation of the fan in terms of the cross-sectional shape of the fan blades. Because the amount is small, the dust and dirt attached to the filter attached to the cover of the engine room cannot be removed sufficiently, and the filter body becomes clogged with the dust and dust that cannot be removed, and the radiator There was a problem that the cooling efficiency was lowered, and as a result, the engine was overheated.

  Therefore, the main problem of the present invention is to eliminate such problems.

  The present invention that has solved the above problems is as follows.

  According to the first aspect of the present invention, a radiator (9) is provided between the engine (E) and a filter body (8B) for filtering dust, and the engine (E) is driven between the radiator and the engine (E). A clutch (C) that connects and disconnects transmission of driving force from the engine (E) to the cooling fan (10) in a driving part of a working vehicle in which a cooling fan (10) that rotates by receiving force transmission is arranged. Providing a blower (17) for blowing air from the inside to the outside of the filter body (8B) so as to be able to enter the space (11) formed between the radiator (9) and the filter body (8B), From the time when the blower (17) enters the space (11), the clutch (C) is disconnected with a delay of a set time, the cooling fan (10) stops, and the blower from the blower (17). As the start And a bypass path (12) for bypassing the filter body (8B) and introducing outside air to the cooling fan (10) with the blower (17) entering the space (11). As a driving part of a working vehicle characterized by the above.

  According to a second aspect of the present invention, in the work according to the first aspect, the bypass path (12) includes a valve body (13) opened by a negative pressure generated by the rotation of the cooling fan (10). This is the driving part of the vehicle.

  According to a third aspect of the present invention, there is provided a duct (15) in which the outside air inlet (18c) of the air blower (17) communicates with the outside of the airframe in a state where the air blower (17) has entered the space (11). The working part of the working vehicle according to claim 1 or 2 is configured to be connected to the motor.

  According to a fourth aspect of the present invention, the duct (15) includes an on-off valve (15b) biased in the closing direction, and when the blower (17) enters the space (11), The working part of the working vehicle according to claim 3, wherein the opening / closing valve (15b) is pushed open by a member on the blower (17) side.

  According to the first aspect of the present invention, the clutch (C) is delayed by a set time from the time when the blower (17) enters the space (11) between the radiator (9) and the filter body (8B). The cooling fan (10) is shut off and air blown from the blower (17) is started and blown from the inside of the filter body (8B) to the outside, so that it adheres to the filter body (8B). Removes dust such as sawdust, reduces clogging of the filter body (8B), increases the efficiency of sucking outside air by the cooling fan (10), and prevents engine (E) output reduction and overheating it can.

  At this time, a negative pressure is generated by the rotation of the cooling fan (10) until the cooling fan (10) stops after the blower (17) enters the space (11). Since the outside air is introduced from the bypass circuit (12) that bypasses the cooling fan (10) to the cooling fan (10), the overheating of the engine (E) can be reduced.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the bypass path (12) that bypasses the filter body (8B) and introduces outside air to the cooling fan (10). Since the valve body (13) opened by the negative pressure generated by the rotation of the cooling fan (10) is provided, the generation of negative pressure is reduced when the cooling fan (10) is stopped, and the valve body (13) is It closes and it is possible to prevent intrusion of dust from the bypass circuit (12).

  According to invention of Claim 3, in addition to the effect of the invention of Claim 1 or Claim 2, in the state where the air blower (17) entered the space portion (11), the air blower ( 17) Since the outside air intake port (18c) of 17) is connected to the duct (15) communicating with the outside of the machine body, the amount of air blown from the blower device (17) can be secured, and the dust removal ability attached to the filter body (8B) can be secured. Can be increased.

  According to the invention of claim 4, in addition to the effect of the invention of claim 3, in the state where the blower (17) does not enter the space (11), the on / off valve (15b) The duct (15) is closed and dust can be prevented from being sucked from the duct (15) due to the negative pressure generated by the rotation of the cooling fan (10).

It is a right view of a combine. It is a top view of a combine. It is a back view for description of the drive part in a normal working state. It is a side view of the drive part in a normal working state. It is a back view for explanation of a prime mover in a dust removal state. It is a side view of the drive part in a dust removal state. It is a side view of the drive part of the state which removed the filter body. It is a side view of an air blower. It is a rear view of an air blower. It is a rear view of the rail which guides raising / lowering an air blower. It is explanatory drawing which cuts and shows an air blower and a duct. It is sectional drawing of a duct. It is a side view of a duct. It is a block circuit diagram for automatic control.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the sake of easy understanding, the explanation is given with the direction shown for the sake of convenience with the front as the front, the rear as the rear, the right hand side as the right side, and the left hand side as the left side, as viewed from the operator boarding the cockpit. However, the configuration is not limited by these.
(Combine configuration)
As shown in FIGS. 1 and 2, the combine is provided with a traveling device 2 composed of a pair of left and right crawlers below the body frame 1, and a threshing device 3 that performs threshing and sorting is provided on the upper left side of the body frame 1. The front side of the threshing device 3 is provided with a reaping device 4 for harvesting cereal grains in the field. The grains threshed and selected by the threshing apparatus 3 are stored in a Glen tank 5 provided on the right side of the threshing apparatus 3, and the stored grains are discharged to the outside by the discharge cylinder 7.
(Composition of the motor part)
On the upper right side of the fuselage frame 1, a cockpit 6 including an operation unit on which an operator gets on is provided. Below the cockpit 6, an engine room 8 on which an engine E is mounted is provided. Further, a cover 8A that can be opened during maintenance and inspection of the engine room 8 is mounted on the right side of the engine room 8, and a filter body 8B formed of a cut iron plate or the like is attached to the lower part of the cover 8A. Yes. The upper part of the cover 8A is formed of an iron plate 8D having no openings.

  As shown in FIGS. 3 and 5, an engine E is provided inside the engine room 8.

  On the right side (outside) of the engine E, a radiator 9 that cools the cooling water supplied to the engine E at a predetermined interval is provided. The radiator 9 is provided with a water temperature sensor 9a for detecting the temperature of the cooling water.

  A radiator fan (cooling fan) 10 that rotates with the driving force of the engine E and sucks outside air from the outside to the inside of the filter body 8B is disposed between the engine E and the radiator 9.

  An electromagnetic clutch (clutch) C is provided between the front end portion of the output shaft of the engine E and the rotation center portion of the radiator fan 10, and driving force is applied to the radiator fan 10 from the output shaft of the engine E via the electromagnetic clutch C. It is configured to be transmitted.

  That is, when the electromagnetic clutch C is connected, the radiator fan 10 is rotationally driven by the driving force of the engine E, and when the electromagnetic clutch C is disconnected, the driving force of the engine E is not transmitted to the radiator fan 10. The radiator fan 10 is stopped or freely rotated.

  Although not illustrated, the outer periphery of the radiator fan 10 is surrounded by a shroud.

  As shown in FIGS. 3 and 5, the filter body 8B described above is disposed on the right side (outer side) of the radiator 9 with a space therebetween, and a space portion 11 is formed between the radiator 9 and the filter body 8B. ing.

  In this space 11, a detour path 12 is formed in the lower right portion of the radiator 9, by opening the bottom wall of the engine room 8 so as to bypass the filter body 8 </ b> B and introduce outside air to the radiator fan 10. .

  A valve body 13 that is opened by a negative pressure generated by the rotation of the radiator fan 10 is provided in an opening that forms the bypass path 12.

  The valve body 13 is always urged in the closing direction by a torque spring 14 and is configured to be pushed open by a negative pressure generated by the rotation of the radiator fan 10.

  In addition, a duct 15 having a right triangle shape in a rear view is installed on the bottom wall of the engine room 8 at a portion closer to the filter body 8B than the valve body 13.

  As shown in FIGS. 12 and 13, the duct 15 has a rectangular lower opening 15a communicating with the outside of the fuselage (below the fuselage) on the bottom surface, and an open / close valve 15b is provided on the slope. A rectangular upper opening 15c is formed.

  The on-off valve 15b is pivotally supported on the inner side of the duct 15 so that the upper side is pivotable up and down, and is always urged in the closing direction by a torque spring 15d.

  As shown in FIGS. 3 and 5, a lift drive electric motor 16 is installed on the upper wall of the engine room 8, and a screw shaft 16a that is rotationally driven by the lift drive electric motor 16 is provided inside the filter body 8B. It hangs down in a posture along the side.

  The blower device 17 that moves up and down by the rotation of the screw shaft 16a is provided so as to be able to move up and down over the lowered position that has entered the space portion 11 and the raised position that has been retracted from the space portion 11.

  As shown in FIGS. 7 to 11, the fan case 17 s of the blower device 17 is formed in a saucer shape by four trapezoidal side walls 17 b provided in an expanded posture from the four sides of the rectangular bottom wall 17 a, The rotating shaft 18a of the blower fan 18 is disposed at the center of the bottom wall 17a, and the blower fan electric motor 18b for driving the rotating shaft 18a is attached to the surface of the bottom wall 17a opposite to the rotating shaft 18a. Yes.

  Of the four side walls 17b, the lower side wall 17b is formed with a rectangular outside air suction port 18c, and the lower end of the side wall 17b is fixed with an upper end portion of a rectangular tube 18d communicating with the outside air suction port 18c. Has been. The rectangular tube 18d is provided in a hanging posture from the fan case 17s.

  Of the four side walls 17b described above, a tongue piece 18e is formed integrally with the outer edge of the front and rear side walls 17b.

  As shown in FIG. 10, a rail 19 having a U-shaped cross section with a groove is vertically installed at two front and rear positions on the outer end portion of the engine room 8, and the tongue piece 18e of the fan case 17s described above is provided. It is configured to be inserted into the groove 19a of the rail 19 and guide the raising and lowering of the fan case 17s.

  As shown in FIGS. 3, 5, and 7, the female screw member 20 that is screwed into the screw shaft 16 a described above is located on the bottom wall 17 a of the fan case 17 s that is biased forward with respect to the blower fan electric motor 18 b. Is attached.

  With the above configuration, in the normal working state shown in FIG. 3, the blower 17 is lifted and retracted from the space portion 11, and the outer edge portions of the four sides of the fan case 17s are the iron plate 8D without the top of the cover 8A. Opposite to.

  In this state, the upper opening 15c formed on the slope of the duct 15 is closed by the on-off valve 15b.

  On the other hand, as shown in FIG. 5, when the screw shaft 16a is rotated by the blower fan electric motor 18b and the blower 17 descends and enters the space 11, the fan case 17s faces the filter body 8B, and the fan case The filtration surface 8C of the filter body 8B is covered from the inside by the outer edge portions of the four sides of 17s. Thereby, the flow of the outside air sucked through the filtration surface 8C of the filter body 8B is blocked.

In this state, as shown in FIGS. 5 and 11, the rectangular cylinder 18d provided in a hanging position from the fan case 17s is attached by the torque spring 15d from the upper opening 15c formed on the inclined surface of the duct 15. It is inserted into the duct 15 and connected while pushing down the opening / closing valve 15b against the force. As a result, the outside air inlet 18 c communicates with the outside of the machine body, and outside air is sucked into the blower fan 18 from the lower opening 15 a formed on the bottom surface of the duct 15.
(Operational effects of the above configuration)
From the point in time when the blower 17 enters the space 11 between the radiator 9 and the filter body 8B, the clutch C is disconnected with a delay of a set time to stop the rotation of the radiator fan 10, and the blower 17 causes the inside of the filter body 8B. The dust is removed from the filter body 8B by removing the dust from the filter body 8B, the clogging of the filter body 8B is reduced, the efficiency of the outside air intake by the radiator fan 10 is increased, and the output of the engine E Reduction and overheating can be prevented.

  At this time, a negative pressure is generated by the rotation of the radiator fan 10 from when the blower 17 enters the space 11 until the radiator fan 10 stops, but the radiator fan starts from the bypass circuit 12 that bypasses the filter body 8B. Since the outside air is introduced into the engine 10, overheating of the engine E can be reduced.

  Further, since the clutch C is disconnected and the radiator fan 10 stops after a set time delay from the time when the blower 17 enters the space 11 formed between the radiator 9 and the filter body 8B, filtration by suction of outside air is performed. Adsorption of dust to the body 8B is reduced, and the blowing efficiency from the inside to the outside of the filter body 8B by the blower device 17 is increased, so that the filter body 8B is less clogged and the output of the engine E is reduced or overheated. Can be prevented.

  Moreover, since the filter surface 8C of the filter body 8B is covered from the inner side by the outer edge of the fan case 17s provided in the blower device 17, even if the rotation stop of the radiator fan 10 is delayed, Inhalation of the outside air can be blocked by the fan case 17 s of the blower device 17, and it is not necessary to provide a separate blocking member, and can be provided at low cost.

  In addition, since the electromagnetic clutch C is disengaged after a set time from the time when the blower 17 enters the space 11 formed between the radiator 9 and the filter body 8B, the time for which the rotation of the radiator fan 10 continues is delayed. Although it is present, outside air is introduced to the radiator fan 10 by bypassing the filter body 8B by the bypass path 12, dust in the filter body 8B is removed by the blower 17 while the cooling state of the engine E is appropriately maintained. It is possible to prevent a decrease in output of the engine E and overheating.

  Further, since the bypass path 12 that bypasses the filter body 8B and introduces outside air to the radiator fan 10 includes the valve body 13 that is opened by the negative pressure generated by the rotation of the radiator fan 10, the blower device 17 is a space. In a state where it has not entered the section 11, the generation of negative pressure by the radiator fan 10 is reduced, the valve body 13 is closed, and dust can be prevented from entering from the bypass circuit 12.

  Further, since the outside air inlet 18c of the blower device 17 is connected to the duct 15 communicating with the outside of the machine body in the state where the blower device 17 has entered the space portion 11, the amount of air blown from the blower device 17 can be secured, and filtration is performed. The ability to remove dust adhering to the body 8B can be enhanced.

Further, in a state where the blower device 17 has not entered the space portion 11, the duct 15 is closed by the on-off valve 15 b, and dust can be prevented from being sucked from the duct 15 due to the negative pressure generated by the rotation of the radiator fan 10.
(Configuration of automatic control circuit)
As shown in FIG. 14, the controller 21 has an input-side interface 21a and an output-side interface 21b. An automatic control on / off switch 21c for switching automatic control to valid / invalid for the input-side interface 21a, and a fan case 17s. Has reached the descending end position (contacted with the inclined surface of the duct 15), and the descending end position detection switch 21e detects that the fan case 17s has reached the rising end position. A water temperature sensor 9a that detects the water temperature of the radiator 9, an output rotation sensor 21f that detects the output rotation speed of the engine E, a vehicle speed sensor 21g that detects the vehicle speed of the work vehicle, and left and right axles that drive the traveling device 2 Left axle rotation sensor 21h and right axle rotation sensor 21i for detecting the rotation speed of A cutting clutch sensor 21j that detects a connection state of a cutting clutch that transmits output rotation of the engine E to the cutting device 4, a cutting clutch lever sensor 21k that detects a connection operation of a cutting clutch lever that connects and operates the cutting clutch, and an engine E A discharge clutch sensor 21l for detecting the connection state of a discharge clutch that transmits the output rotation of the discharge clutch to the spiral in the discharge cylinder 7, a discharge clutch lever sensor 21m for detecting a connection operation of a discharge clutch lever for connecting and operating the discharge clutch, The potentiometer-type cutting height sensor 21n for detecting the raising / lowering position of the cutting device 4 with respect to the opening, the opening / closing valve sensor 21o for detecting that the opening / closing valve 15b provided in the duct 15 is pushed open, and the cutting device 4 are introduced. A cereal sensor 21p for detecting the presence or absence of a reaping target culm and a turning operation of the machine body are detected. And rotating operation detecting sensor 21q, the fuel consumption sensor 21r for detecting the fuel consumption of the engine E is connected.

The output side interface 21b is connected to an ascending drive side relay 21s and a descending drive side relay 21t that forward / reversely drive the elevating drive electric motor 16, a fan rotation relay 21u that rotates the blower fan electric motor 18b, and an electromagnetic clutch C. To do.
(Basic automatic control)
When the automatic control on / off switch 21c is turned on and operated by the above control circuit, the automatic control function is switched to an effective state, and basic control is started.

  When the engine E is started by operating the main key switch 21v in this state, the controller 21 checks the detection state of the rising end position detection switch 21e, and if the rising end position detection switch 21e is not ON, the controller 21 is output to the ascending drive side relay 21s via the output interface 21b, electric power is supplied to the lifting drive electric motor 16, the screw shaft 16a is driven forward, and the fan case 17s of the blower 17 is raised. The forward rotation of the screw shaft 16a is continued until the rising end position detection switch 21e is turned on and then stopped. Thereby, the air blower 17 raises and retreats from the space part 11 between the radiator 9 and the filter body 8B. In this state, no output is made to the fan rotation relay 21u, and the blower fan electric motor 18b does not rotate.

  When the clock circuit in the controller 21 determines that the first set time (about 20 seconds) has elapsed, the controller 21 outputs to the descending drive side relay 21t via the output side interface 21b, and the motor for raising and lowering driving is performed. Power in the reverse direction is supplied to the motor 16, the screw shaft 16a is driven in reverse, and the fan case 17s of the blower 17 is lowered. The reverse rotation of the screw shaft 16a is continued until the descending end position detection switch 21d is turned on and then stopped. Thereby, the air blower 17 descend | falls into the space part 11 between the radiator 9 and the filter body 8B, and approachs. When the lower end position detection switch 21d is turned on, the controller 21 outputs to the electromagnetic clutch C and the fan rotation relay 21u via the output interface 21b, and the electromagnetic clutch C is disconnected and the rotation of the radiator fan 10 is stopped. At the same time, the blower fan electric motor 18b is driven to rotate the blower fan 18. The output to the electromagnetic clutch C is output with a time delay of 1 to 2 seconds after the lower end position detection switch 21d is turned ON. Further, the output to the fan rotation relay 21u is continued for the second set time (about 5 seconds) and then stopped, and the blower 17 is lifted and retracted to the rising end position by the output to the ascending drive side relay 21s. .

  At this time, when the descending end position detection switch 21d is turned OFF, the controller 21 outputs the reverse direction to the electromagnetic clutch C and the fan rotation relay 21u via the output interface 21b, and the electromagnetic clutch C is connected and the radiator fan 10 rotates. Is started, the blower fan electric motor 18b is stopped, and the rotation of the blower fan 18 is stopped.

  In this way, in the basic control, the raising and lowering of the blower device 17 and the driving and stopping of the blower fan 18 are repeatedly performed every set time.

In addition, by the above-mentioned 1st setting time and 2nd setting time, the time in which the air blower 17 exists in a raise end position is set longer than the time in which the air blower 17 exists in a fall end position.
(Linkage control with mowing clutch)
Further, in the state where the basic control described above is performed, when the connection of the cutting clutch is detected by the cutting clutch sensor 21j, or when the connection operation of the cutting clutch lever is detected by the cutting clutch lever sensor 21k. The lowering of the blower 17 and the driving of the blower fan 18 are performed with priority over the basic control. As a result, when the cutting clutch is connected and the cutting operation is started, the cutting operation is started after the dust previously adsorbed to the filter body 8B is blown off, so that the cooling efficiency of the engine E is increased. Output reduction and overheating can be prevented. Also in this case, when the second set time elapses, the blower 17 is lifted and retracted to the rising end position by the output to the rising drive side relay 21s.
(Linkage control with discharge clutch)
Further, when the connection state of the discharge clutch is detected by the discharge clutch sensor 21l, or when the discharge clutch lever sensor 21m detects that the discharge clutch lever is connected, the lowering of the blower 17 and the blower fan are performed. The drive 18 is performed in preference to the basic control. Thereby, when the discharge clutch is connected and the grain in the glen tank 5 is discharged, the dust adsorbed on the filter body 8B is blown off, so that the cooling efficiency of the engine E is improved and the output of the engine E is reduced. And overheating can be prevented. Also in this case, when the second set time elapses, the blower 17 is lifted and retracted to the rising end position by the output to the rising drive side relay 21s. In this case, the second set time may be set longer than the above time.
(Linked control with cereal sensor)
In addition, when the culm sensor 21p detects the presence of the culling target culm at the start of reaping operation, the lowering of the blower 17 and the driving of the blast fan 18 are performed with priority over the basic control. Thereby, since the cutting operation is started after the dust adsorbed on the filter body 8B is blown off, the cooling efficiency of the engine E can be increased, and the output reduction and overheating of the engine E can be prevented. Also in this case, when the second set time elapses, the blower 17 is lifted and retracted to the rising end position by the output to the rising drive side relay 21s.
(Control linked to the turning of the aircraft)
When the turning operation detection sensor 21q detects the turning operation of the airframe, or the left axle rotation speed detected by the left axle rotation sensor 21h and the right axle rotation sensor 21i detect the right axle. When it is determined that the difference from the rotation speed of the fan is greater than the set rotation speed, the lowering of the blower 17 and the driving of the blower fan 18 are performed with priority over the basic control. As a result, when the side of the field is cut and the body is turned, the mowing operation is resumed after the dust adsorbed on the filter body 8B is blown off, the cooling efficiency of the engine E is increased, and the output of the engine E is reduced. And overheating can be prevented. Also in this case, when the second set time elapses, the blower 17 is lifted and retracted to the rising end position by the output to the rising drive side relay 21s.
(Shifting control of lifting speed)
The output to the ascending drive side relay 21s and the descending drive side relay 21t is set as a pulse output, and the duty ratio of this pulse output is changed to change the output rotational speed of the elevating drive electric motor 16, thereby blowing the blower 17 You may comprise so that the raising / lowering speed of can be changed. That is, if the descending speed of the blower 17 is set higher than the ascending speed, this dust can be quickly removed when the filter body 8B is clogged, and the overheating preventing effect of the engine E is enhanced. Further, if the rising speed of the blower 17 is set higher than the descending speed, the shut-off state of the outside air to be sucked from the filter body 8B by the fan case 17s can be quickly released, and the engine E by the radiator fan 10 can be released. Increases the cooling efficiency.
(Linkage control with reaping)
Further, when the cutting height sensor 21n detects that the cutting device 4 has been raised to the non-working height, the lowering of the blower 17 and the driving of the blower fan 18 are performed with priority over the basic control. As a result, when the machine body is turned after the mowing device 4 is raised to the non-working height after cutting one side of the field, the dust adsorbed on the filter body 8B is blown off, and then the cutting operation is resumed. The cooling efficiency of the engine E is increased, and the output reduction and overheating of the engine E can be prevented. Also in this case, when the second set time elapses, the blower 17 is lifted and retracted to the rising end position by the output to the rising drive side relay 21s.
(Linkage control with radiator water temperature)
Further, when the water temperature sensor 9a detects that the temperature of the cooling water of the radiator 9 has risen above the set temperature, the lowering of the blower 17 and the driving of the blower fan 18 are prioritized over the basic control. Is called. As a result, when the temperature of the cooling water of the radiator 9 rises due to an increase in the load applied to the engine E, the dust adsorbed on the filter body 8B is blown off, the cooling efficiency of the engine E is increased, the output of the engine E is reduced, Overheating can be prevented. Also in this case, when the second set time elapses, the blower 17 is lifted and retracted to the rising end position by the output to the rising drive side relay 21s.
(Linkage control with engine load)
Further, the load applied to the engine E is calculated from the relationship between the output rotation speed of the engine E detected by the output rotation sensor 21f and the fuel consumption detected by the fuel consumption detection sensor 21r. When the load exceeds the set load, the lowering of the blower 17 and the driving of the blower fan 18 are performed with priority over the basic control. Thereby, when the load concerning the engine E increases, the dust adsorb | sucked to the filter body 8B can be blown off, the cooling efficiency of the engine E can be improved, and the output fall and overheating of the engine E can be prevented. Also in this case, when the second set time elapses, the blower 17 is lifted and retracted to the rising end position by the output to the rising drive side relay 21s.

8B Filter body 9 Radiator 10 Radiator fan (cooling fan)
DESCRIPTION OF SYMBOLS 11 Space part 12 Bypass path 13 Valve body 15 Duct 15b On-off valve 17 Air blower 18c Outside air inlet C Electromagnetic clutch (clutch)
E engine

Claims (4)

  A radiator (9) is provided between the engine (E) and a filter body (8B) for filtering dust, and cooling between the radiator and the engine (E) is rotated by receiving driving force from the engine (E). A clutch (C) that connects and disconnects transmission of driving force from the engine (E) to the cooling fan (10) is provided in the driving part of the working vehicle in which the fan (10) is arranged, and the filter (8B) An air blower (17) that blows air from the inside to the outside is provided so as to enter the space (11) formed between the radiator (9) and the filter body (8B), and the air blower (17) is provided in the space. From the time of entering the part (11), the clutch (C) is disengaged after a set time delay, the cooling fan (10) is stopped and the air blowing from the blower (17) is started, The blower (17 Is provided with a bypass path (12) that bypasses the filter body (8B) and introduces outside air to the cooling fan (10) in a state of entering the space section (11). Department.   The motive part of the working vehicle according to claim 1, wherein the bypass path (12) includes a valve body (13) opened by a negative pressure generated by the rotation of the cooling fan (10).   The outside air inlet (18c) of the blower (17) is connected to a duct (15) communicating with the outside of the machine body in a state where the blower (17) has entered the space (11). The driving | running | working part of the working vehicle of Claim 1 or Claim 2.   The duct (15) is provided with an on-off valve (15b) biased in the closing direction, and when the blower (17) enters the space (11), a member on the blower (17) side. The driving part of the working vehicle according to claim 3, wherein the on-off valve (15b) is configured to be pushed open by the above.

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