JP3441633B2 - Work machine engine cooling system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cooling device for a working machine such as a combine machine, and more particularly to a fan for cooling an engine and a dust-proof net at an intake port of a radiator. Provided,
A first driving state for cooling, in which the fan is driven forward, so as to supply the air to the radiator by sucking air from the dust-proof net, and a second driving state, for dust removal, in which the fan is driven reversely so as to exhaust the air from the dust-proof net. A switchable drive mechanism is provided to alternately switch the drive mechanism to the first drive state for a first set time and to switch the drive mechanism to the second drive state for a second set time shorter than the first set time. The present invention relates to a device provided with a control device that performs repetitive fan control. 2. Description of the Related Art For example, in a conventional engine cooling device for a combine, when a threshing clutch is engaged and an engine speed reaches a set value, a control device is automatically started to control the fan control. Had to do. That is,
The engine cooling by driving the fan forward for a first set time and the dust removal by driving the fan reversely for a second set time are repeatedly performed. [0003] However, in the case of the above-mentioned conventional technique, a dust-proof net that supports the engine cooling until the first set time elapses after the dust is removed by driving the fan in the reverse direction. When clogging has occurred, the clogging could not be eliminated until the first set time has elapsed and the fan is driven in reverse. An object of the present invention is to make it possible to remove dust by driving a fan in reverse depending on the state of clogging of a dustproof net. [0005] The features, functions and effects of the first invention according to claim 1 are as follows. [Characteristics] A first driving state for cooling in which a fan for engine cooling is provided, a dust-proof net is provided at an intake port of the radiator, and the fan is driven to rotate normally so that air is sucked from the dust-proof net and supplied to the radiator. And a driving mechanism that can be switched to a second driving state for dust removal in which the fan is driven in reverse so as to exhaust air from the dustproof net to the outside, and the driving mechanism is switched to the first driving state for a first set time. An engine cooling device for a working machine provided with a control device that performs a fan control that alternately repeats switching a drive mechanism to a second drive state over a second set time shorter than a set time, wherein the control device includes: When the dust switch is turned on, first
The operation is performed from the second driving state, and thereafter, the first driving state and the
There is provided a means for performing the fan control which alternately repeats the two driving states . According to the first aspect of the present invention, the control device switches the driving mechanism to the second driving state for dust removal by turning on the dust removal switch and starts fan control. If clogging or similar clogging occurs, turn off the dust switch and stop the operation of the control device, then turn on the dust switch again and restart the control device to restart the fan. Dust can be removed for the second set time after the reverse rotation drive. In addition, when the amount of dust adhered to the dustproof net is small, the dust removal can be performed by turning off the dust removal switch to stop the fan control and then turning on the dust removal switch when dust removal becomes necessary. As a result, the engine can be satisfactorily cooled while avoiding unnecessary dust removal by reversely driving the fan. In other words, every time the first set time elapses while the engine is being cooled by driving the fan in the normal direction, dust is automatically removed by driving the fan in the reverse direction for the second set time to maintain good engine cooling performance. However, dust can be removed as appropriate. According to the first aspect of the present invention, therefore, the fan is normally driven in reverse for a second set time every time the first set time elapses during engine cooling while the fan is normally driven. The engine cooling performance can be maintained satisfactorily by automatically removing dust, and if clogging of the dust-proof net progresses quickly and it becomes difficult to maintain the engine cooling performance with normal fan control, The dust can be quickly removed and the dust can be reliably removed in a state where unnecessary dust removal by driving the fan in the reverse direction is avoided. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A combine, which is an example of a working machine, is shown in FIG. At the front of a self-propelled body frame 2 equipped with a crawler traveling device 1, a cutting section 3 for cutting and cultivating planted grain culms and transferring the harvested grain rearward is movably connected to the self-propelled body frame 2, and the cutting section 3 is attached to the self-propelled body frame 2. It is equipped with a threshing device 4 for threshing grain stalks from, a boarding operation unit 5, and a tank 6 for storing thresh grains. A water-cooled engine 7, a radiator 8 for cooling the engine, and a fan 9 for cooling the engine are arranged below the driver's seat 5A of the boarding driver 5. As shown in FIG. 2, the intake port 8 of the radiator 8
A is provided with a dustproof net 10 for removing dust in the intake air to the radiator 8. As shown in FIG. 2, a driving mechanism 11 for the fan 9 is provided with a first driving state for cooling in which the fan 9 is driven to rotate forward so as to draw air from the dustproof net 10 and supply it to the radiator 8, and The engine 7 and the engine can be switched to a second driving state for dust removal in which the fan 9 is reversely driven so as to exhaust the dust from the net 10 to the outside and blow off dust adhering to the dustproof net 10 to the outside. The rotation switching mechanism 12 is configured to switch between a first state in which power is transmitted to the fan 9 as forward rotation power and a second state in which power is transmitted as reverse rotation power. As shown in FIG. 2, the engine cooling device is started by turning on the engine start switch 13 to switch the drive mechanism 11 to the first drive state, that is, to set the rotation switching mechanism 12 to the first state. The first control unit 14 for switching and the threshing switch 15 that is reversibly turned on by the engagement of a threshing clutch interposed in the transmission system from the engine 7 to the threshing device 4 are turned on, and the engine speed is higher than a set value. Is activated when the dust removal switch 17 is turned on under the condition that the rotation is detected, the rotation control mechanism 12 is controlled in preference to the first control unit 14, the threshing switch 15 is turned off, and the rotation speed less than the set value. And a second control unit 18 that stops operating when any of the following is detected and the dust removal switch 17 is turned off. As shown in FIG. 3, the second control unit 18 switches the rotation switching mechanism 12 from the second state to the first state for the first set time T1, and sets the second control unit 18 to the second state shorter than the first set time T1. The fan control is performed to alternately switch the rotation switching mechanism 12 from the first state to the second state over the set time T2, and the rotation switching mechanism 12 is switched to the second state by turning on the dust removal switch 17. The fan control is started.
Further, as shown in FIG. 4, the second control unit 18 includes a time adjusting unit 21 that adjusts the first set time T1 based on the operation of the variable setter 20. That is, the second control unit 18
Can adjust the first set time T1. As a specific numerical example, the set value is 500 rpm, and the standard of the first set time T1 is 150 rpm.
Seconds, and the second set time T2 is 30 seconds. Therefore, according to the above configuration, when the engine start switch 13 is turned on, the fan 9 is rotated forward to cool the engine, the threshing switch 15 is turned on, and the engine tachometer 16 exceeds the set value. When the dust removal switch 17 is turned on while the rotation speed is being detected, the dust is removed by driving the fan 9 in the reverse direction for the second set time T2, and the fan 9 is driven in the forward direction for the first set time T1. The cooling of the engine and the cooling of the engine are performed alternately in a state in which the dust removal is performed first. Then, as shown in FIG. 3, the first set time T after dust removal is set.
When it is desired to remove dust before the time 1 has elapsed, the dust control switch 17 is once turned off and then turned on again, thereby performing fan control for executing dust removal first,
Dust can be removed without waiting for the first set time T1 to elapse.
The first set time T1 because the amount of dust attached to the dustproof net 10 is small.
If it is not necessary to remove the dust after elapse, the dust control switch 17 is turned off to perform the fan control by the first control unit 14, that is, to perform the engine cooling by driving the fan 9 to rotate in the normal direction. When dust removal becomes necessary due to an increase in the amount of dust adhering to the dustproof net 10, the dust removal can be performed by turning on the dust removal switch 17. Thus, dust can be removed according to the clogging state of the dust-proof net 10. Moreover, as shown in FIG. 4, the first set time T1 is shortened when the dustproof net 10 is clogged quickly, and the first set time T1 is lengthened when the dustproof net 10 is hardly clogged. In addition, by adjusting the first set time T1 according to the degree of adhesion of the dust to the dust-proof net 10, the dust removal and the engine cooling can be performed satisfactorily without causing excessive cooling of the fan 9 to rotate in the reverse direction. be able to. [Another Embodiment] In the above embodiment, the control device 19 switches the drive mechanism 11 to the second drive state by turning on the dust removal switch 17, starts fan control, and sets the first set time T1.
Is shown, but as the control device 19,
One that only switches the drive mechanism 11 to the second drive state by turning on the dust removal switch 17 and starts fan control,
The first set time T1 may only be adjustable. In the above embodiment, the drive mechanism 11 includes the engine 7 and the rotation switching mechanism 12, but the drive mechanism 11 may be an electric motor capable of switching between forward and reverse rotation. In the above-described embodiment, an example in which the combine is applied to an engine cooling device has been described. However, the present invention can be applied to an engine cooling device of various working machines such as a tractor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a combine. FIG. 2 is a control block diagram. FIG. 3 is a time chart showing a rotation state of a fan when a dust removal switch is turned on and off. FIG. 4 is a second set time. [Description of reference numerals] 8 Radiator 8A Inlet 9 Fan 10 Dustproof net 11 Drive mechanism 19 Controller 17 Dust switch T1 First set time T2 Second set time

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B60K 11/04 F01P 11/12

Claims (1)

(57) [Claims 1] A fan for cooling an engine is provided, a dustproof net is provided at an intake port of a radiator, and the fan is driven to rotate in a normal direction so that air is sucked from the dustproof net and supplied to the radiator. A driving mechanism is provided which can be switched between a first driving state for cooling and a second driving state for dust removal in which the fan is driven in reverse so as to exhaust air from the dustproof net to the outside, and the driving mechanism is switched to the first driving state for a first set time. An engine cooling device for a working machine provided with a control device that performs a fan control that alternately repeats switching to a driving state and switching a driving mechanism to a second driving state for a second set time shorter than the first set time. When the dust removal switch is turned on as the control device ,
Is executed from the second drive state first, and thereafter the first drive
An engine cooling device for a working machine, comprising: a unit for performing the fan control that alternately repeats a moving state and the second driving state .