JP2005153689A - Combined harvester and thresher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid generation of overheating due to clogging of a dust-proof net by providing a cleaning means of simple structure for eliminating clogging of the dust-proof net provided in an engine cooling air intake opening. <P>SOLUTION: A variable pitch mechanism V for changing a pitch angle of a plurality of vanes 22a of a radiator fan 22 is provided to change a blowing direciton of the radiator fan 22 between a normal direction and a reverse direction. When clogging of the dust-proof net 15 remarkably progresses, a normal direction of the engine cooling air from the radiator fan 22 is changed to a direction from the engine 14 to the radiator 20 (the dust-proof net 15) for reverse blowing, and the straw and the dust caught by the dust-proof net 15 is eliminated by the air blowing in the reverse direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of a radiator fan in a combine.

  In a conventional combine, a dust-proof net is provided on the front of the radiator to prevent clogging of the radiator, and dust, other dust, etc. that are forced to be sucked in by the radiator fan are captured by the dust-proof net. It is configured as follows.

If the clogging of the dust screen is significantly advanced, the intake of the engine cooling air is not sufficiently taken in and overheating of the engine occurs. Therefore, the clogging of the dust screen is caused by the change in the speed of the engine cooling air and the engine cooling water. There is known a detector provided with a warning means based on the detection result and a cleaning means for releasing clogging of the dust screen while detecting by a change in water temperature (see, for example, Patent Document 1).

JP 9-1332041 A

  However, the cleaning means described above is intended to obtain a dust removing action against dust, other dust, and the like captured by the dust screen by rotating the radiator fan in the reverse direction, and simply rotating the radiator fan in the reverse direction. The airflow was insufficient and the expected effect was not obtained.

  The present invention has been made for the purpose of solving the above-mentioned problems, and is provided with a dust screen on one side of the engine room, a radiator disposed on the inside of the dust screen, and the radiator and the engine. In the combiner in which the radiator fan is provided between them, a variable pitch mechanism for changing the blade pitch angle of the radiator fan is provided so that the blowing direction of the radiator fan can be changed forward and backward.

  According to the present invention, since the variable pitch mechanism for changing the blade pitch angle of the radiator fan is provided, and the air blowing direction of the radiator fan can be changed forward and reverse, the clogging of the dust proof net is significantly advanced. Change the direction of the engine cooling air by the normal radiator fan from the engine to the direction of the radiator (dust net), and by the reverse wind force obtained by that, dust and other dust captured by the dust net is removed Sufficient dust removal action for dust removal is obtained.

  Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the combine C has a pre-processing unit 2 that cuts pedicles at the front of the traveling machine body 1. The traveling machine body 1 is supported by crawler traveling devices 5 and 5 provided on the left and right sides of the machine body, and the harvested grain straw is transported to the threshing unit 3 by a scraping transport chain and a grain straw feed chain (not shown), In the threshing section 3, threshing and sorting is performed.

  The grain selected by the threshing unit 3 is transferred through a not-shown milling cylinder and temporarily stored in the grain tank 4, and when the grain tank 4 is full, the discharge auger 6 takes it out of the machine. It is carried out. After the threshing, the slaughtered waste is cut or bound by the slaughter processing unit 7 at the rear of the machine body and discharged outside the machine.

  An upper part of the traveling machine body 1 has a driver's seat 8 covered with a cabin 10, and the driver's seat 8 is provided with a driving operation unit 11. An engine room 18 that houses the engine 14 is provided below the driver's seat 8, and the power of the engine 14 is transmitted to the crawler traveling device 5, the preprocessing unit 2, and the like via a transmission (not shown). .

  More specifically, as shown in FIGS. 3 and 4, the engine 14 is housed in an engine room 18 whose one side surface is covered with an engine cover 16, and a dust-proof net ( Wire mesh) 15 is attached. A radiator 20 is provided inside the dust proof net 15, and a radiator fan 22 that takes in air as cooling air from the air inlet through the shroud 21 and circulates the cooling air is attached to the radiator 20. It has been.

  A guard plate 28 that covers the lower part of the engine room 18 is attached to the machine body frame 12 that forms the machine body 1 below the engine room 18. In the guard plate 28, the air sucked from the air suction port by the radiator fan 22 strikes the crawler traveling device 5 from the front side (the radiator 20 side) of the engine 14 as indicated by an arrow A shown in FIG. It is intended to prevent repeated vicious circles such as being sucked in from the air suction port again, and the air sucked from the air suction port by the guard plate 28 is moved to the rear of the engine 14 (as indicated by the arrow B). It will flow smoothly to the opposite side of the aircraft).

  Further, the guard plate 28 prevents the mud carried around by the crawler traveling device 5 from entering the engine room 18, so that the mud adheres to a wire harness or hydraulic hose (not shown) in the engine room 18. However, there is no problem that the wire harness, the hydraulic hose, etc. are damaged.

  As shown in FIGS. 5A and 5B, the radiator fan 22 according to the present invention has a plurality of blades 22a, 22a,... Attached to the blade pitch angle, that is, the rotational axis X of the radiator fan 22. A variable pitch mechanism V that changes the angle in the range of θ1 to θ2 is provided, and the variable pitch mechanism V allows the air blowing direction of the radiator fan 22 to be changed forward and backward, and the dust screen 15 is clogged. When remarkably advanced, the blade pitch angle θ1 of the plurality of blades 22a,... Constituting the normal radiator fan 22 shown in FIG. 5 (A) is changed to the blade pitch angle θ2 shown in FIG. 5 (B). By changing the air blowing direction of the radiator fan 22 from W1 to W2 by the reverse, the reverse wind force obtained thereby removes the dust and other dust captured by the dust net 15 It is those intoxicated to.

  Next, the variable pitch mechanism V that changes the blade pitch angle of the radiator fan 22 described above will be described. As shown in FIGS. 5 and 6, the base of the radiator fan 22 is a disc-shaped cam 33 which is fitted into the central shaft 31 a of the bracket 31 via a bracket 31 provided on the engine cover 16 side and balls 32, 32. , The thrust bearing 34, hubs 35, 36 and the like that can be fitted into the concave and convex portions.

  The inclined surfaces 33a, 33a,... Formed on one side of the disk-shaped cam 33 are in contact with one side surface 31b of the bracket 31 via the balls 32, 32,. The hub 35 slides in the G arrow direction via the spring 38 due to the thrust force generated by operating the wire 37 fixed to the F arrow direction. At this time, as schematically shown in FIG. 7, one of the base ends of the blades 22 a constituting the radiator fan 22 rotates around a fulcrum P provided on the hub 36 and the other is formed on the hub 35. The variable pitch mechanism V is configured to change the blade pitch angle of the radiator fan 22. The wire 37 may be configured to be operated via an actuator such as an electric motor.

  According to the above-described configuration, when the clogging of the dustproof net has progressed remarkably, the direction of the engine cooling air from the normal radiator fan 22 is changed forward and backward from the engine to the radiator (dustproof net 15) 20, thereby By the reverse wind force obtained, it becomes possible to remove dust, other dust, and the like captured by the dust net 15.

  It should be noted that the timing of removing dust, other dust, etc. captured by the dust screen 15 is determined from the yield, which is the actual work amount, using a not-shown soot sensor provided in the grain tank 4. It may be configured.

  Further, as the vehicle speed at the time of harvesting of the combine C increases, the field wastes and other dusts are likely to rise, thereby increasing the amount of wastes and other dusts captured by the dust screen 15. Therefore, the operation timing of the cleaning means that removes dust and other dust captured by the dust screen 15 may be controlled in conjunction with the vehicle speed. In other words, the vehicle speed of the combine C is detected by a travel rotation sensor provided in a transmission (not shown), and based on the vehicle speed detection result, for example, when the vehicle speed is high, the cleaning means is frequently used to remove dust by the cleaning means. When the vehicle operation speed is low, it is not necessary to frequently perform dust removal by the cleaning means, so that the operation stop interval of the cleaning means may be set longer.

The side view of a combine. The top view which shows the inside of a cabin. The perspective view which shows the engine accommodated in an engine room and its inside. FIG. (A) is a perspective view which shows the operating state of a normal radiator fan. (B) is a perspective view which shows the state which changed the blade pitch angle of the radiator fan. The exploded view which shows the base end part (variable pitch mechanism) of a radiator fan. (A) The model figure which shows the state before blade | wing pitch angle change (normal). (B) The model figure which shows the state which changed the blade | wing pitch angle.

Explanation of symbols

14 Engine 15 Dustproof net 18 Engine room 20 Radiator 22 Radiator fan V Variable pitch mechanism

Claims (1)

A dust screen (15) is attached to one side of the engine room (18), and a radiator (20) is disposed inside the dust screen (15), and between the radiator (20) and the engine (14). In the combiner in which the radiator fan (22) is provided, a variable pitch mechanism (V) for changing the blade (22a,...) Pitch angle of the radiator fan (22) is provided, so that the radiator fan (22) blows air. A combine that can change the direction forward and reverse.

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