JPH1136862A - Engine cooling device for working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a fan for radiator to change to a regular and a reverse operations adequately to reduce the dust attached to a dust net and the like, in the condition not to reduce the cooling performance of an engine as much as possible, by estimating the attaching amount of the dust to the dust net and the like from the condition of reaping corps. SOLUTION: When the condition of reaping corps with the large dust generating amount is input as the fan driving condition, a radiator fan is intermittently charged in a regular operation condition and a reverse operation condition in a long time interval T1, under the condition that the ratio of the time to be a reverse operation for flowing air reversely, to the time to be a regular operation that the outer air is absorbed through a dust removing part is large. On the other hand, when the condition of raping corps that the dust generating amount is little is input as the fan riving condition, the radiator fan is inter-mittently changed in the regular operation condition and the reverse operation condition in a sort time interval T3, under the condition that the ratio of the time to be the above reverse operation condition, to the time to be the regular operation condition, is little.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive means for switching a radiator fan between a normal rotation state in which outside air is sucked through a dust removing portion and a reverse rotation state in which air flows in a reverse direction, and a fan for the radiator. And a control means for controlling the operation of the driving means such that the motor is intermittently switched between a forward rotation state and a reverse rotation state.

[0002]

2. Description of the Related Art In an engine cooling device for a working vehicle, when the time for sucking outside air for cooling a radiator through a dust removing portion such as a dustproof net becomes long, dust contained in the outside air adheres to the dustproof mesh or the like for cooling. In order to solve the problem that the amount of wind intake decreases and the cooling performance of the engine decreases,
The fan for the radiator is intermittently switched from the normal rotation state to the reverse rotation state, and the dust attached to the dustproof net is blown off and removed by the wind force in the direction opposite to the suction direction.
Focusing on the fact that the temperature of the water of the radiator rises when the dust adheres to the dust-proof net and the cooling performance of the engine decreases, the fan for the radiator is changed from the normal rotation state to the reverse rotation state according to the detected water temperature of the radiator. (For example, see Japanese Patent Application Laid-Open No. 7-224654).

[0003]

However, in the above-mentioned prior art, the operation of switching the radiator fan to the reverse rotation state is performed after detecting that dust has adhered to the dustproof net or the like and the cooling performance of the engine has been reduced. Since the control is performed so as to increase the time, a delay in the control cannot be avoided, and the durability of the engine may be reduced. On the other hand, for example, in a case where a work vehicle is a harvesting work vehicle such as a combine that cuts a crop planted in a field, the amount of dust generated when, for example, soybeans are cut is larger than that in a case where rice is used. Conditions (in this example, conditions for harvested crops)
Thus, the amount of dust generated can be predicted, and under working conditions where the amount of generated dust is large, it is considered that the amount of dust contained in the outside air adhering to the dust net or the like is large.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to switch a radiator fan to a reverse rotation state based on, for example, a prediction of the amount of dust generated from work conditions and the like. An object of the present invention is to achieve appropriate fan forward / reverse switching control without changing the engine cooling performance as much as possible by changing the time.

[0005]

According to the first aspect of the present invention, a fan driving condition for determining a ratio of a time period during which the radiator fan is in a reverse rotation state to a time period during which the radiator fan is in a normal rotation state is inputted, and the inputted fan driving condition is inputted. In a state in which the time ratio is determined by the conditions, the radiator fan is intermittently switched between a normal rotation state in which the outside air is sucked through the dust removing unit and a reverse rotation state in which the air flows in the opposite direction.

Therefore, for example, when it is expected that a large amount of dust is generated and a large amount of dust adheres to a dustproof net or the like, the ratio of the time during which the radiator fan is in the normal rotation state to the time during the reverse rotation state is determined. By inputting a fan drive condition that increases the size, it is possible to appropriately remove a large amount of dust attached to the dust net, etc., and it is predicted that the amount of dust generated is small and the dust attached to the dust net, etc. is small. In this case, input a fan drive condition that reduces the ratio of the time in the reverse rotation state to the time in the normal rotation state, and unnecessarily reverse rotation while appropriately removing dust adhering to the dustproof net. Switching to the state can be avoided, so that appropriate forward / reverse switching control of the fan can be realized without reducing the cooling performance of the engine as much as possible.

According to a second aspect of the present invention, in the first aspect, different working conditions are input as fan driving conditions, and the ratio of the time of the normal rotation state to the time of the reverse rotation state determined from the working conditions is equal to that of the radiator fan. Is intermittently switched between a normal rotation state in which the outside air is sucked through the dust removing unit and a reverse rotation state in which the air flows in the opposite direction.

Therefore, when the amount of dust generation can be predicted in advance in accordance with each work condition, the time ratio for switching the radiator fan between the normal and reverse rotations only by inputting the information on each work condition is appropriately set. Therefore, appropriate fan driving conditions can be easily and definitely input as compared with a case where the time ratio is input as a numerical value or the like, so that the preferred means of claim 1 can be obtained.

According to a third aspect, in the first or second aspect,
The work vehicle is a harvesting work vehicle that reaps a crop planted in a field, and the condition of the harvested crop is input as a fan driving condition, and the ratio of the time of the forward rotation state to the time of the reverse rotation state determined from the condition of the harvested crop is calculated. In this state, the radiator fan is intermittently switched between a normal rotation state in which outside air is sucked in through the dust removing unit and a reverse rotation state in which air flows in the opposite direction.

Therefore, when the amount of dust can be predicted in advance by conditions such as the type of the crop, such as when the amount of dust generated when the crop is soybean is larger than that when the crop is rice, the harvesting is performed. The time ratio for switching the radiator fan between forward and reverse can be appropriately set only by inputting the crop conditions. In this embodiment, the fan drive condition can be input, and the suitable means according to claim 1 or 2 can be obtained in a reaping work vehicle for reaping a crop planted in a field.

According to a fourth aspect, in any one of the first to third aspects,
In the paragraph, when the detected water temperature of the radiator does not exceed the set upper limit temperature, the above operation of switching the radiator fan to the normal rotation state or the reverse rotation state is performed, and the detected water temperature of the radiator exceeds the set upper limit temperature. In this case, the radiator fan is maintained in the normal rotation state without switching to the reverse rotation state.

Therefore, for example, when the set upper limit temperature is set to a temperature close to the overheat state of the engine, if the water temperature of the radiator becomes high and there is a risk of overheating, the radiator fan is maintained in the normal rotation state. The engine can be cooled in an appropriate state, and the suitable means according to any one of claims 1 to 3 can be obtained.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings with respect to a case of a reaper (specifically, a combine) for reaping a crop planted in a field. As shown in FIG. 1, a threshing device 2 is provided at a rear portion of a body provided with a pair of right and left crawler traveling devices 1, a cutting unit 3 is provided at a front portion of the body, and an operating unit 4 is provided at a rear right side of the cutting unit 3. Are arranged to constitute a combine for harvesting and harvesting of crops.

As shown in FIG. 2, an engine 5 is provided in a hood 6 disposed below a cockpit 7 provided in the driving section 4.
And a radiator 8 for cooling the engine 5 and a radiator fan 9. Further, a dustproof net 20 is provided at a communication port with outside air provided on a lateral side surface of the hood 6 so as to cover the entire surface.

Next, the driving structure of the fan 9 for the radiator 8 will be described. As shown in FIGS. 3 and 5, a pulley 11 is fixed to a rotating shaft 10 supported on the side surface of the engine 5, and extends over the pulley 11, the output pulley 12 of the engine 5, and the input pulley 13 a of the alternator 13. Thus, the first transmission belt 14 is wound. or,
A tension pulley 15 is supported at the tip of an arm 15a swingably supported around a horizontal axis P3 at the upper part of the case of the alternator 13, and a spring 15b for urging the arm 15a toward the first transmission belt 14 is provided. Thus, the tension pulley 15 is constantly pressed against the outer surface of the first transmission belt 14.

One corner portion of the triangular flat plate-like switching member 16 is swingably supported by the rotating shaft 10, and a forward pulley 17 such as two pulleys and two pulleys are stacked. Such a reverse pulley 18 is supported by support shafts 17a and 18a located at the other two corner portions of the switching member 16, respectively. The fan 9
Is rotatably supported by a pulley 11 of a rotary shaft 10 via a bearing, and an input pulley 9a is attached to a base of the fan 9. The input pulley 9a and the pulleys 17 for forward and reverse rotation of the switching member 16 are provided. A second power transmission belt 19 is wound around 18.

As shown in FIGS. 6 and 7, the support shaft 17a for supporting the forward rotation pulley 17 is fixed to the switching member 16, while the support shaft 18a for the reverse rotation pulley 18 is switched by the bolt 21 and the bracket 22. Positionally supported along a long hole 16 a formed in the member 16,
The distance between the forward and reverse pulleys 17 and 18 can be finely adjusted.

In the above structure, as shown in FIG.
The output pulley 12 rotates with the operation of the engine 5, and the first transmission belt 14 constantly rotates in the direction of the arrow in the figure. Then, the switching member 16 is moved to the normal rotation position A shown in FIG.
When the swing operation is performed (corresponding to the forward rotation state), the forward rotation pulley 17 is pressed against the inner surface of the first transmission belt 14, and the power of the first transmission belt 14 is transmitted via the forward rotation pulley 17 and the second transmission belt 19. The power is transmitted to the input pulley 9a as forward rotation power, and the fan 9 and the input pulley 9a are driven forward in the clockwise direction shown in FIG. Fan 9 like this
In the state where is driven in the forward rotation, the normal air flowing from the dustproof net 20 of the bonnet 6 to the engine 5 through the radiator 8 as cooling air by the suction action of the fan 9 as shown by the solid arrow in FIG. State.

Conversely, when the switching member 16 is swung to the reverse rotation position B (corresponding to the reverse rotation state) shown in FIG. 4, the reverse pulley 18 is pressed against the outer surface of the first transmission belt 14 and the first rotation belt 14 is pressed.
The power of the power transmission belt 14 is transmitted to the input pulley 9a as the power for reverse rotation via the reverse pulley 18 and the second power transmission belt 19, and the fan 9 and the input pulley 9a are moved in FIG.
Is driven in the counterclockwise direction shown in FIG. In the state where the fan 9 is driven in the reverse direction, air flows in the opposite direction to that described above due to the blowing action of the fan 9 as indicated by the two-dot chain line arrow in FIG. 2, and the surface of the radiator 8 and the dustproof net 20 ( In particular, dust attached to the lower side) is blown away.

Next, the swing operation structure of the switching member 16 will be described. As shown in FIGS. 2, 5 and 7, the disc-shaped first winding member 23 is rotatably supported around the axis P <b> 1 at a position different from the rotating shaft 10 of the switching member 16.
Further, a motor 2 for rotating and driving the first winding member 23
4, while the switching member 16 is also provided with a semi-disk-shaped second
The winding member 25 is fixed. The wire 26 connected to the pin 23a of the first winding member 23 is wound around the second winding member 25, and the support shaft 17 of the switching member 16 is wound.
a of the first winding member 23
A spring 27 is connected between the control member 16 and the switching member 16.

The state shown in FIG.
Is located at an angle corresponding to the forward rotation position A of the switching member 16, and the switching member 16 is swingably operated to the forward rotation position A by the pulling action of the spring 27, and the fan 9 is driven to rotate forward. (See FIG. 3). In this state, the wire 26 slightly sags, and the urging force of the spring 27 and the tension of the first transmission belt 14 are balanced. In this case, the spring 27 and the pin 23a are connected to the axis P1 of the first winding member 23.
And the first winding member 23 is about to rotate clockwise by the urging force of the spring 27, but a stopper 29 is provided to stop the first winding member 23 at the angle shown in FIG. Because of the urging force of the spring 27 and the action of the stopper 29, the first winding member 2
3 is held at the angle shown in FIG.

Next, as shown in FIG. 8, the first winding member 23 is rotated about 180 ° counterclockwise by the motor 24.
When the wire 26 is driven only by rotation, the wire 26
3, the switching member 16 and the second winding member 25 also swing counterclockwise, the switching member 16 swings to the reverse rotation position B, and the fan 9 is driven in reverse rotation. (See FIG. 4). In this case, the switching member 1
When the swing operation of the switch 6 is performed from the forward rotation position A to the reverse rotation position B, the spring 27 is pulled toward the switching member 16 with the swing of the switching member 16, and at the same time, the spring 27 is connected. The pin 23a of the first winding member 23 also moves toward the switching member 16 (about the length of the diameter of the first winding member 23), so that the switching member 16 swings from the normal rotation position A to the reverse rotation position B. The spring 27 does not become a large resistance to the operation.

Conversely, when the first take-up member 23 is positioned at an angle corresponding to the reverse rotation position B of the switching member 16 as shown in FIG. When the wire 26 is driven to rotate by about 180 ° in the direction, the wire 26 is drawn out from the first winding member 23, and the spring 27 is pulled by the movement of the pin 23a, and the switching member 16 and the second winding member are biased by the spring 27. 25 also swings clockwise, and the switching member 16 swings to the normal rotation position A as shown in FIG.

As described above, the motor 24 drives the fan 9 for the radiator 8 to switch between the forward rotation state in which the outside air is sucked through the dustproof net 20 as a dust removing unit and the reverse rotation state in which air flows in the opposite direction. Functions as a means.

As shown in FIG. 9, a control device 30 using a microcomputer is provided as a control structure for cooling the engine. The control device 30 has a water temperature detecting means for detecting the water temperature of the radiator 8. A sensor S1, a threshing switch S2 for detecting the on / off state of a threshing clutch (not shown), and a crop changeover switch S3 for inputting the type of the crop (specifically, rice, wheat, soybean) as the condition of the crop. Each piece of information is input, while a drive signal for the motor 24 is output from the control device 30.

The control device 30 is used to intermittently switch the fan 9 for the radiator 8 between a normal rotation state (normal rotation position A of the switching member 16) and a reverse rotation state (reverse rotation position B of the switching member 16). The control means 100 controls the operation of the motor 24 so as to be switched to the control mode.

Specifically, during the mowing operation,
As the amount of dust generated in the order of rice, wheat, and soybeans increases,
As shown in the figure, the switching member 16 is switched to the normal rotation position B for a predetermined time t at a set time interval from the state in which the switching member 16 is held at the normal rotation position A and the fan 9 for the radiator 8 is driven to rotate normally. While the set time interval is rice,
Control so that barley and soybeans become shorter in that order. That is, the time interval T1 for rice shown in FIG. (A)> the time interval T2 for wheat shown in FIG. (B)> the time interval T3 for soybean shown in FIG.
Is set to Switching the switching member 16 between the normal rotation position A and the reverse rotation position B requires a predetermined operation time, during which the switching member 16 is in the neutral position.

As described above, the driving condition input means for inputting the fan driving condition for determining the ratio of the time in which the fan 9 for the radiator 8 is in the normal rotation state to the time in the reverse rotation state by the crop change switch S3. The control means 100 determines the ratio of the time during which the fan 9 for the radiator 8 is in the normal rotation state to the time when the fan 9 for the radiator 8 is in the normal rotation state based on the drive condition input means, that is, the input information of the crop changeover switch S3. The motor 24 is configured to operate in a state where the ratio is determined by the fan drive condition, that is, the condition of the crop.

However, if the detected water temperature of the radiator 8 exceeds a set upper limit temperature (for example, a temperature close to an overheat state) based on the information of the water temperature sensor S1, the control means 100 controls the radiator. The fan 9 is not switched to the reverse rotation state.
That is, the radiator fan 9 is maintained in the normal rotation state.

Next, the control operation of the control device 30 will be described based on the control flow shown in FIG. When the control is started, the switching member 16 is operated to the normal rotation position A to put the fan 9 in the normal rotation state. Next, threshing switch S
If No. 2 is on and the detected water temperature of the water temperature sensor S1 does not exceed the set upper limit temperature, the crop change switch S3 determines whether rice, wheat, or soy is selected, and selects the rice. If so, a long time interval T1 is set, if wheat is selected, an intermediate time interval T2 is set, and if soybean is selected, a short time interval T3 is set. Then, at each time interval T1, T2, T3, the switching member 16 is operated to the reverse rotation position B for the time t.

When the threshing switch S2 is off and when the water temperature detected by the water temperature sensor S1 exceeds the set upper limit temperature, the control for operating the switching member 16 to the reverse rotation position B is not executed.

[Another Embodiment] In the above embodiment, when the ratio of the time in which the radiator fan 9 is in the reverse rotation state to the time in which the radiator fan 9 is in the normal rotation state is changed in accordance with the fan driving condition (the condition of the crop), the reverse rotation is performed. The time interval for switching to the state is changed, but the present invention is not limited to this. For example, as shown in FIG. 12, from the state where the switching member 16 is held at the normal rotation position A and the fan 9 for the radiator 8 is driven to rotate normally, the switching member 16 is moved to the reverse rotation position B for a predetermined time at a set time interval T. To the reverse position B
Is controlled so that the reversal time for switching to is longer in the order of rice, wheat, and soy. That is, the reversal time t1 for rice shown in FIG. (A) <the reversal time t2 for wheat shown in FIG.
May be set to the reverse rotation time t3 for soybean shown in FIG.

In the above embodiment, the fan 9 is disposed downstream of the radiator 8 in the flow direction of the outside air sucked through the dust removing section (dustproof net 20).
For example, the fan 9 may be arranged upstream of the radiator 8.

In the above embodiment, the fan 9 for the radiator is used.
Is constituted by means (motor 24) for switching the transmission direction when transmitting the rotational force from the engine 5 to the fan rotation mechanism as the driving means 24 for switching the rotation between the normal rotation state and the reverse rotation state. Alternatively, while the fan 9 is configured to be rotationally driven by an electric motor, the rotation direction of the electric motor may be switched between forward and reverse.

In the above embodiment, the case where the work vehicle is a mowing work vehicle has been described. However, other work vehicles for agricultural work, work vehicles for civil engineering and construction, and the like may be used.

In the above embodiment, the case where the drive condition input means inputs the condition of the cut crop as the fan drive condition has been described. However, the present invention is not limited to this. For example, the drive condition input means may be constituted by numerical value input means for inputting the ratio of the time of the reverse rotation state to the time of the normal rotation state by numerical information, or the time may be set in three stages of large, medium and small. It may be constituted by a switch for changing the ratio or the like.

In the case where the amount of dust generation is predicted in accordance with the different working conditions in which the work vehicle works, the driving condition input means inputs different working conditions as fan driving conditions, and the control means 100 Alternatively, the fan 9 for the radiator 8 may be intermittently switched between the normal rotation state and the reverse rotation state in a state in which the ratio of the time of the normal rotation state to the time of the reverse rotation state determined from each work condition is obtained.

When the work vehicle is a mowing vehicle, the condition of the harvested crop is input as the fan drive condition.
Even with the same crop (rice, soybeans, etc.), the amount of dust generated differs depending on the wet condition of the crop (dry conditions are judged to have more dust than wet conditions). May be input.

[Brief description of the drawings]

FIG. 1 is an overall side view of a combine.

FIG. 2 is a longitudinal sectional front view of the vicinity of the hood of the combine.

FIG. 3 is a front view showing an operation state of a switching member in a normal rotation state.

FIG. 4 is a front view showing an operation state of a switching member in a reverse rotation state;

FIG. 5 is a longitudinal side view of the vicinity of a switching member and first and second winding members;

FIG. 6 is a cross-sectional view showing a support structure of a reverse pulley in a switching member.

FIG. 7 is a front view showing the switching member, first and second winding members in a normal rotation state;

FIG. 8 is a front view showing the switching member and the first and second winding members in a reverse rotation state;

FIG. 9 is a block diagram of a control configuration.

FIG. 10 is a time chart showing a radiator fan switching operation.

FIG. 11 is a flowchart of a control operation.

FIG. 12 is a time chart showing a radiator fan switching operation of another embodiment.

[Explanation of symbols]

 Reference Signs List 8 radiator 9 fan 20 dust remover 24 drive means 100 control means S1 water temperature detection means S3 drive condition input means

Claims (4)

[Claims] 1. A driving means for switching a radiator fan between a normal rotation state in which outside air is sucked in through a dust removing unit and a reverse rotation state in which air flows in a reverse direction, and the radiator fan rotating in a normal rotation state and in a reverse rotation state. A control means for controlling the operation of the drive means so as to be intermittently switched to a state, the engine cooling apparatus for a working vehicle, wherein the radiator fan is in a reverse rotation state with respect to a time in a normal rotation state. Drive condition input means for inputting a fan drive condition for determining a time ratio is provided, wherein the control means controls the radiator fan in a normal rotation state based on input information of the drive condition input means. An engine of a work vehicle configured to operate the driving means in a state in which a ratio of a time in a reverse rotation state to a certain time is a ratio determined from the fan driving conditions. Down cooling system. 2. The engine cooling device for a work vehicle according to claim 1, wherein said drive condition input means is configured to input different work conditions as said fan drive conditions. 3. The work vehicle is configured as a mowing work vehicle that cuts a crop planted in a field, wherein the driving condition input means includes:
3. The engine cooling device for a working vehicle according to claim 1, wherein the condition of the crop is input. 4. A water temperature detection means for detecting a water temperature of the radiator, wherein the control means, based on information of the water temperature detection means,
The work vehicle according to any one of claims 1 to 3, wherein the radiator fan is configured not to switch to a reverse rotation state when a detected water temperature of the radiator exceeds a set upper limit temperature. Engine cooling device.