JPH0633765A - Engine cooling structure for agricultural working machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an engine cooling structure for an agricultural machine in which a structure for eliminating clogging of a dustproof net can be easily installed without hindering the introduction of cooling air. [Structure] A transmission system 23 to a fan 16 for sending cooling air to a radiator 15 is provided with a first clutch 24 for intermittently operating transmission to the fan 16, and the fan 16 is also provided.
The transmission system 2 is configured so that the transmission of the forward rotation driving force from the transmission system 23 to the driving device 27 that drives the reverse rotation is cut off and the transmission of the reverse rotation driving force from the driving device 27 to the fan 16 is enabled.
An engine cooling structure for an agricultural work machine, which is provided with a second clutch 25 that is interlockingly connected to 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine cooling structure for agricultural working machines such as combine harvesters and tractors.

[0002]

2. Description of the Related Art Conventionally, as an engine cooling structure of an agricultural work machine, cooling air is introduced into a radiator chamber through an intake port provided with a dustproof net, as disclosed in, for example, Japanese Utility Model Publication No. 3-112516. A structure is known in which a fan is driven by power transmitted from an engine by a belt.

[0003]

By the way, in the case of the above-mentioned conventional structure, dust adheres to the dust-proof net to cause clogging, which hinders the introduction of cooling air and reduces the cooling performance of the radiator. Then, the engine may be overheated. Therefore, when the dust net has a clogging that deteriorates the cooling performance, the clogging must be eliminated. Conventionally, it takes a lot of time to manually clean the dustproof mesh to eliminate clogging.Therefore, the cooling fan is temporarily stopped and the clogging removal fan installed inside the dustproof mesh is operated by an electric motor. It has been proposed to remove the dust adhering to the dust-proof net by driving the air through the dust-proof net to blow it outward from the radiator chamber. However, in the above conventional structure,
Since a dedicated fan for eliminating the clogging of the dust-proof net is installed in the radiator room, it is troublesome to assemble it, and the dedicated fan easily interferes with the introduction of cooling air. There was a problem such as having to increase the output. The present invention has been made in view of the above circumstances, and provides an engine cooling structure for an agricultural work machine in which a structure for eliminating clogging of a dustproof net can be easily installed without hindering the introduction of cooling air. With the goal.

[0004]

In order to achieve the above-mentioned object, an engine cooling structure for an agricultural work machine according to the present invention has a transmission system for a fan for sending cooling air to a radiator, in which transmission to the fan is intermittently performed. The first clutch to be operated is interposed, and the transmission of the normal rotation driving force from the transmission system to the driving device that drives the fan in the reverse direction is cut off and the reverse rotation driving force is transmitted from the driving device to the fan. A second clutch interlockingly connected to the transmission system is provided to enable the above. The operation and effect of this characteristic configuration are as follows.

[0005]

Operation: That is, by disengaging the first clutch,
The fan that blows cooling air to the radiator is stopped, and then the drive device is driven to reversely drive the fan through the second clutch, so that the fan blows air in the opposite direction to the introduction of cooling air. As a result, air is blown outward to the dustproof net, and the dust adhering to the dustproof net is blown outward.

[0006]

Therefore, since the fan for blowing the cooling air to the radiator can be used to blow the dust for eliminating the clogging of the dustproof net, the dedicated fan for eliminating the clogging becomes unnecessary, and the assembling thereof, etc. It became unnecessary to do and the structure became simple.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 shows a combine as an example of the agricultural work machine. In this combine, a cutting pretreatment unit 3 is attached to a front portion of a machine body 2 supported by a pair of left and right crawler traveling devices 1, 1 so as to be vertically swingable around a horizontal axis core, and a cutting pretreatment unit 3 is used. The threshing device 4 that receives and then threshes the grain culms that have been transported to the rear side is mounted on the machine body 2, and the control unit 5 is provided on the right lateral side of the threshing device 4 and the driving unit is provided behind the control unit 5. The part 6 and the driving part 6 are provided with a gren tank 7 to form an all culm throw type.

The drive unit 6, as shown in FIGS. 2 and 3,
The engine 10 is elastically supported on the machine body frame 8 via anti-vibration rubbers 9 and four vertical frames 11 are installed upright on the machine body frame 8 so as to surround the engine 10. Covers 12A, 12B and 12C are respectively attached to the upper part, the front part and the rear part of the engine to form the engine room 13 and above the engine 10.
The engine room 1 with the dustproof net partition wall 14 arranged horizontally
3 is divided into a lower space portion 13a in which the engine 10 is arranged and an upper space portion 13b in which the radiator 15 and the like are arranged, and cooling is performed by a radiator cooling fan 16 to the outside in the machine width direction. A dustproof net 17 for removing dust such as dust from the wind is additionally provided, and an exhaust cover 18 for exhausting the radiator cooling air to the outside is further provided inside in the lateral direction of the machine body.

As shown in FIG. 1, the radiator cooling fan 16 is connected to a support shaft 21 of a driven pulley 20 of a belt transmission mechanism 19 linked to an output shaft from the engine 10,
It is provided facing the fan shroud 22. The belt transmission mechanism 19 and the support shaft 21 form a transmission system 23 to the radiator cooling fan 16. Then, the driven pulley 20
An electromagnetic clutch 24, which is a first clutch capable of intermittently operating transmission from the driven pulley 20 to the support shaft 21, is interposed between the support shaft 21 and the support shaft 21. At the end of the spindle 21 where the threshing device 4 extends from the driven pulley 20, a second driven pulley 26 is provided via a one-way clutch 25 as a second clutch.
The second driven pulley 26 is interlocked with an electric motor 27 as a drive device via a transmission belt 29 stretched between a drive pulley 28 connected to an output shaft of the electric motor 27. It is connected. This one-way clutch 2
5 is a support shaft 2 for driving the radiator cooling fan 16 in the normal direction.
The rotational power of No. 1 is not transmitted to the second driven pulley 26, and the power for driving the radiator cooling fan 16 in the reverse direction from the second driven pulley 26 to the support shaft 21 is transmitted.

As shown in FIG. 1, a control device 30 for driving and operating the electromagnetic clutch 24 and the electric motor 27 is provided, and the control device 30 is connected to the upper space 13b of the engine room 13. In order to detect the temperature inside, a detection signal from a temperature sensor 31 including a thermistor or the like arranged in the upper space 13b is input. Then, the control device 30 constantly detects the temperature of the upper space portion 13b by the temperature sensor 31, and as shown in FIG. 4, when the detected temperature of the temperature sensor 31 becomes higher than the preset temperature Ta, A state in which the clutch 24 is operated in the disengaged state and the radiator cooling fan 16 is reversely driven by the electric motor 27, and a state in which the electromagnetic clutch 24 is operated in the engaged state and the electric motor 27 is stopped are repeated at regular intervals. It is configured to control. When the temperature detected by the temperature sensor 31 is lower than the set temperature Ta, the electromagnetic clutch 24 is turned on and the electric motor 27 is stopped by normal control.

With the above structure, when dust adheres to the dust-proof net 17 during the cutting and threshing work and clogging occurs, and the cooling air blowing to the radiator 15 is weakened, hot air from the engine 10 or the like causes the engine room 13 to cool. When the temperature in the upper space portion 13b rises and the temperature rise becomes equal to or higher than the preset temperature Ta, the control device 30 operates the electromagnetic clutch 24 in the disengaged state and drives the electric motor 27 to rotate the radiator cooling fan 16 in the reverse direction. The control for repeating the state of turning on and the state of turning on and off the electromagnetic clutch 24 to stop the electric motor 27 at regular intervals is started, and during reverse rotation driving, as shown by the arrow in the figure, the dustproof mesh Since air is blown so that the dust adhering to 17 is blown outward, the clogging state is eliminated, whereby the upper space portion 13b
When the internal temperature becomes lower than the temperature Ta, the operation of blowing the normal cooling air is performed.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an engine cooling structure with a cooling fan driven in reverse.

FIG. 2 is a partially cutaway vertical rear view showing a driving part of the combine in a state where a cooling fan is driven in reverse.

FIG. 3 is a perspective view showing a prime mover of the combine.

FIG. 4 is a graph showing the relationship between the temperature detection result by the temperature sensor in the upper space of the engine room and the fan driving state.

FIG. 5 is an overall side view showing the combine.

[Explanation of symbols]

 15 radiator 16 fan 23 transmission system 24 first clutch 25 second clutch 27 drive device

Claims (1)

[Claims] 1. A transmission system (23) to a fan (16) for blowing cooling air to a radiator (15), said fan (1)
6) The first clutch (24) for intermittently operating the transmission to the drive unit (6) is provided, and the forward rotation driving force from the transmission system (23) to the drive unit (27) for driving the fan (16) in the reverse direction is transmitted. A second clutch (25) interlockingly connected to the transmission system (23) is provided so as to interrupt transmission and enable transmission of reverse driving force from the drive device (27) to the fan (16). Engine cooling structure for agricultural machinery.