JPH04311620A - Engine cooling device - Google Patents

Abstract

PURPOSE:To enable simply an auxiliary motor fan to be automatically changed over between the turned on and off conditions if necessary. CONSTITUTION:In an engine cooling device provided with an auxiliary motor fan to suck from the outside a portion of cooling air sent to an engine or radiator for a working machine, working machine operation detecting means SW1, SW2 for detecting the operation of the working machine are provided. A fan controller C is provided which operates the auxiliary motor fan 18 on the basis of the detecting signal only when the working machine is operated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cooling system equipped with an auxiliary electric fan for sucking a portion of cooling air into a working machine engine or its radiator from the outside.

0002

2. Description of the Related Art Conventionally, such auxiliary electric fans have been operated and stopped by an operator using an on/off switch as necessary.

0003

[Problems to be Solved by the Invention] However, in reality, appropriate on/off switching is rarely performed, and in many cases, the auxiliary electric fan is left operating at all times to prevent the engine from overheating. This is unfavorable from the standpoint of energy saving, and at the same time has the disadvantage that the dustproof screen becomes clogged quickly, which tends to lead to a decrease in cooling capacity.

[0004] The present invention has been made in view of the above circumstances, and its purpose is to easily perform automatic on/off switching of the auxiliary electric fan as required.

[0005]

[Means for Solving the Problems] The engine cooling device of the present invention is provided with an auxiliary electric fan that takes in a part of cooling air from the outside to a working machine engine or its radiator. The structure includes: a work machine operation detection means for detecting the operation of the work machine; and a fan control device that operates the auxiliary electric fan only when the work machine is operating based on a detection signal from the work machine operation detection means. It is in the point where it is.

[0006]

[Operation] It is necessary to utilize the auxiliary electric fan's function of increasing cooling capacity and preventing engine overheating when the engine load is large. It can be inferred that if a working machine driven by the engine operates, the load on the engine will increase. Therefore, according to the present invention, the fan control device operates the auxiliary electric fan only when the work machine is in operation, based on the detection signal of the work machine operation detection means.

[0007]

[Effects of the Invention] Therefore, the auxiliary electric fan can be automatically switched on and off as required with ease. As a result, the hassle of manual switching is eliminated, and compared to the case where the switch is always on, it is superior in terms of energy savings and the difficulty of clogging the dustproof screen.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a full-culm input type combine harvester will be described below with reference to the drawings.

First, the overall outline of the combine harvester is as shown in a plan view and a side view in FIGS. 3 and 4. A crawler traveling device 2 is provided at the bottom of a machine body on which a threshing device 1 serving as a working device is mounted, and a pretreatment device 3 also serving as a working device is provided in front of the crawler traveling device 2. The pre-processing device 3 includes a raking device 4 and a reaping device 5 for raking and reaping the planted grain culms, an auger 6 for moving the cut grain culms to the center in the width direction of the machine body, and a gathered grain culm. A conveyor 7 is provided to convey the grains to the threshing device 1. A driving unit 8 and a grain tank 9 are provided on the right side of the threshing device 1, and a control room is provided in front of the driving unit 8.

[0010] The driving unit 8 is equipped with an engine and its auxiliary equipment. As shown in FIG. 2, an engine 12 is mounted on a body frame 10 via a vibration-proof rubber 11, and a frame 13 is provided to surround the engine 12. A radiator 14, a muffler 15, an air cleaner 16, a radiator cooling fan 17, and an auxiliary electric fan 18 are attached to the frame 13.

A chamber is formed in the upper part of the engine 12 by a frame 13. A dustproof net 19 is provided on the surface where the air cleaner 16 is attached, that is, on the outer side of the aircraft.
An exhaust cover 20 is attached to the side where the radiator 14 and the radiator cooling fan 17 are attached, that is, the surface on the side of the thresher 1. The bottom surface is separated from the engine 12 by a dustproof net 21.

The radiator 14, the radiator cooling fan 17, and the auxiliary electric fan 18 constitute an engine cooling system, which functions as follows. That is, the outside air taken in by the radiator cooling fan 17 mainly through the dustproof net 19 cools the radiator 14 as cooling air, and then is exhausted through the exhaust cover 20. The cooling water cooled by the radiator 14 is circulated through the crankcase, cylinder head, etc. in the engine 12 by a water pump (not shown) to cool them.

A part of the cooling air that cools the radiator 14 is also taken in through the dustproof net 21 and is sent to the auxiliary electric fan 18.
acts to increase this. Further, a part of the outside air taken in by the auxiliary electric fan 18 becomes cooling air that directly cools the engine 12.

The engine cooling system also includes a fan control device C constructed from the circuit shown in FIG. This is to simply operate the auxiliary electric fan 18 only when the load on the engine 12 is large. That is, the fan control device C operates the auxiliary electric fan 18 only when the threshing device 1 and the preprocessing device 3 as working machines are operating. This is because when the working machine driven by the engine 12 operates, the load on the engine 12 naturally increases. The fan control device C will be explained below.

In FIG. 1, SW1 is a threshing switch that is turned on when the threshing device 1 is operating;
is a reaping switch that is turned on when the pretreatment device 3 is operating. That is, both switches SW1 and SW2 function as working machine operation detection means for detecting the operation of the threshing device 1 and the preprocessing device 3 as working machines. In reality, the threshing switch SW1 is installed so that the contact closes when the threshing clutch that transmits the power of the engine 12 to the threshing device 1 is operated to connect. The same applies to the reaping switch SW2. Further, 18a is a motor of the auxiliary electric fan 18.

As can be seen from FIG. 1, the fan control device C
is configured to operate the fan motor 18a when at least either the threshing switch SW1 or the reaping switch SW2 is turned on. That is, when the first stage transistor TR1 is turned off by the OR signal of the contact signal of the threshing switch SW1 and the contact signal of the reaping switch SW2, the output transistor TR2 is turned on and the coil of the relay RY is excited. As a result, the contacts of relay RY are closed and drive current is supplied to fan motor 18a.

Other embodiments will be listed below. - The auxiliary electric fan 18 may be activated when both the threshing switch SW1 and the reaping switch SW2 are turned on. In this case, the OR circuit of the contact signals of both switches SW1 and SW2 in FIG. 1 may be changed to an AND circuit. ■
Only either one of the threshing device 1 or the preprocessing device 3 may be a working machine whose operating state should be checked in order to operate the auxiliary electric fan 18. Conversely, other devices driven by the engine 12, such as the crawler traveling device 2, may be included in the work machine. ■ The rotational speed of the fan motor 18a is made variable, and a torque sensor is interposed in the power transmission path from the engine 12 to the threshing device 1, and based on the detected information, the larger the load is, the more the auxiliary electric fan 18 is Control may be performed to increase the rotation speed. ■
The present invention is applicable not only to the full-culm input type combine harvester of the above embodiment, but also to self-removal type combine harvesters, and furthermore, to construction machines such as bulldozers.

It should be noted that although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an engine cooling device according to an embodiment of the present invention.

[Fig. 2] A perspective view of the driving part of the combine harvester of this embodiment seen from the back

[Figure 3] Plan view of the combine harvester

[Figure 4] Side view of the combine harvester

[Explanation of symbols]

1,3　　　　　　　　Work equipment

Claims (1)

[Claims] [Claim 1] Engine (12) for work equipment (1, 3)
or an engine cooling device that is equipped with an auxiliary electric fan (18) that sucks in a part of the cooling air from the outside to the radiator (14), the work machine that detects the operation of the work machine (1, 3); An operation detecting means (SW1, SW2) is provided, and a fan control device (C) operates the auxiliary electric fan (18) only when the working machine (1, 3) is operating based on the detection signal thereof. Engine cooling system provided.