JPH0220421Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a work vehicle equipped with a heat radiating device for liquid cooling and a cooling fan that can be rotated forward and backward to ventilate the heat radiating device. More specifically, the present invention relates to a technique for eliminating clogging of the ventilation path of the heat radiating device in this type of work vehicle.

[Conventional technology]

BACKGROUND ART During lawn mowing, threshing, and the like, a large amount of dust such as grass and straw is generated. This dust is sucked together with the cooling air by the cooling fan provided in the work vehicle and adheres to the heat radiating device, which obstructs the circulation of the cooling air and causes various troubles. For example, if the heat radiator is a radiator with a dustproof screen, the dust may clog the dustproof screen and cause the engine to overheat.

Conventionally, for this purpose, the cooling fan was reversed based on the detection of the clogging state, and the adhering dust was blown off with a back wind for cleaning (see, for example, Japanese Utility Model Application Publication No. 117231/1983). .

[Problem that the invention attempts to solve]

The conventional technology has a problem in that the operation of reversing the cooling fan, which must be performed every time dust is deposited, is troublesome, and if the operator forgets to perform the operation, appropriate dust removal may not be performed.

For example, in the case of a radiator with a dustproof screen, if you forget to perform the reverse operation and do not properly remove the dust, the adhering dust will be further sucked into the dustproof screen and become entangled in the screen, and at this point, the dust removal operation should be performed. Even when this was done, the blowing of dust tended to be incomplete, leading to problems such as overheating quickly.

The present invention solves the above problems of the prior art, and aims to provide a work vehicle that can perform reliable dust removal without requiring special operations.

[Means to solve the problem]

In order to achieve the above object, the present invention is provided with a control means for alternately repeating the rotation of the cooling fan into long-time forward rotation for cooling and short-time reverse rotation for cleaning. be.

[Effect]

The control means maintains the rotation of the cooling fan in the normal rotation state for a long period of time to perform a cooling effect, and then reverses the rotation for a short period of time, which is effective for blowing off attached dust, to eliminate clogging, and changes the rotation state between the normal rotation state and the reverse rotation state. It acts to repeat the states alternately.

[Effect of idea]

Therefore, according to the present invention, the following effects can be obtained.

B. No special operation is required to remove dust, it is possible to avoid inconveniences such as overheating due to forgotten operations, and it is possible to reliably remove dust attached to the heat dissipation device.

(b) Since the reverse rotation state is very short compared to the forward rotation state, the negative impact on the heat dissipation device due to the reverse rotation due to dust removal can be minimized, and dust removal can be performed reliably without reducing the cooling capacity of the heat dissipation device. can.

For example, in the case where the dust removal operation is performed based on the temperature rise of the heat dissipation device or the suction negative pressure of the cooling fan, the dust removal operation is performed after clogging has progressed to a certain extent. For this reason, the reversal for the purpose of cleaning must be continuously performed for a certain period of time, and a decrease in the cooling capacity of the heat radiating device during this period is unavoidable. The present invention has the effect that by setting the time of the forward/reverse cycle, the clogging can be cleaned before it becomes apparent, and that reliable cleaning can be performed with a short reversal without reducing the cooling capacity.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 2, the lawn mowing device has a disk-type cutting blade built into the vehicle body 3, which has front and rear drive wheels 1 and 2 that can be freely steered, mounted via a link mechanism 6 that can be vertically swung by a cylinder 5. 4 is suspended, and is provided with an engine 7, a transmission case 8, a riding/driving section 9, a steering handle 10, etc., to constitute a lawn mowing work vehicle which is an example of a work vehicle.

In FIG. 1, an engine radiator equipped with a dustproof net 13 on the front side is attached as a heat dissipation device for liquid cooling, and the coolant in the radiator 11 is pumped and circulated inside the engine 7 by a pump 12 to absorb engine heat. At the same time, it is configured to radiate heat through the fins 11a of the radiator 11. At the rear of the radiator 11, a cooling fan 14 which can be freely rotated in forward and reverse directions is arranged, and when the cooling fan 14 rotates in the forward direction, cooling air is sucked and introduced while removing dust such as grass debris from the dustproof net 13. The cooling fan 14 is configured to enhance heat dissipation from the cooling liquid and blow off dust attached to the outer surface of the dustproof net 13 by rotating the cooling fan 14 in the reverse direction.

A transmission motor 15 that drives the cooling fan 14 is equipped with a control device 1 equipped with a microcomputer.
6 is provided. As shown in the time chart in FIG. 3 and the flow chart in FIG. ), then stops for a certain period of time b (for example, 2 seconds), then performs a short cleaning reversal c (for example, for 5 seconds), and then stops for a certain period of time d (for example, 2 _seconds ) automatically. It is configured to repeat. That is, the cooling fan 14 is alternately rotated forward and backward to blow off the dust sucked into the dustproof net 13 before it becomes entangled in the net.

Next, another embodiment of the present invention will be described. As a configuration in which the rotation of the cooling fan 14 is switched between forward and reverse rotation, the rotation speed of the engine 7 may be counted within the control device 16, or the rotation speed of the engine 7 may be counted in the control device 16.
At the same time as slowing down the rotation of the camshaft and rotating the camshaft,
The power supply connection of the transmission motor 15 may be configured to be switched between forward and reverse directions as the camshaft rotates.
These are collectively referred to as rotation control means 16.

The forward/reverse rotation and stop times a to d are based on the transmission motor 1.
It is possible to change the time periods a to d to suit the characteristics and work style of 5, and it may be configured such that each time period a to d can be changed using a dial, button, or keyboard. Further, each of the times a to d may be configured to select an optimal one from among several types of time patterns set in advance to meet various conditions.

The present invention can also be applied to work vehicles such as combines. The radiator 11, the dustproof net 1
3 and the shape and mounting structure of the cooling fan 14 can be changed. For example, the cooling fan 14 may be disposed between the engine radiator 11 and the dustproof net 13.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

Figure 1 is a side view of the radiator section, Figure 2 is an overall side view of the lawn mowing vehicle, Figure 3 is a time chart showing the rotation control time of the cooling fan, and Figure 4 is the flow for controlling the rotation of the cooling fan. It's a chat. 11... Heat dissipation device, 14... Cooling fan, 16
...control means.

Claims (1)

[Scope of utility model registration request] A heat dissipation device 11 for liquid cooling and the heat dissipation device 1
In a work vehicle equipped with a cooling fan 14 that can freely forward and reverse the rotation of the cooling fan 14, the rotation of the cooling fan 14 is alternately repeated between long-time forward rotation for cooling and short-time reverse rotation for cleaning. A work vehicle characterized by being provided with a control means 16.