JP6033179B2 - Working machine - Google Patents

Description

  The present invention relates to a working machine provided with an engine mounted on an airframe, a pair of left and right crawler travel devices that are driven by the power of the engine to cause the airframe to self-run, and a device that is driven by the power of the engine.

  In recent years, downsizing of engines has been studied as one of the measures for energy saving and compliance with exhaust gas regulations in work machines. The size of the engine is determined based on the load of the engine when the required power in the work equipment reaches a peak in order to prevent inconveniences such as an unreasonable decrease in the engine speed during operation of the work equipment. Is done.

  In order to generate an engine load, the work machine is provided with a pair of left and right crawler travel devices that are driven by the power of the engine and cause the machine body to self-run. The work machine is configured to be able to perform straight running and turning of the machine body by driving a pair of left and right crawler running devices.

  In a conventional work machine equipped with such a pair of left and right crawler traveling devices, the power required for the crawler traveling device on the outside of the turn increases during the turning of the airframe, and the load on the engine increases when the airframe turns. Become. Further, when the crawler traveling device inside the turn is braked during the turning of the airframe to make a so-called sudden turn, the power required for the crawler traveling device is further increased and the engine load is further increased.

  Furthermore, when the body is turned by the crawler traveling device, another device using the power of the engine may be driven. When the turning of the airframe by such a crawler traveling device and the driving of other equipment using the power of the engine overlap, the required power in the working machine tends to peak, and the engine load tends to become the largest.

  In view of the above circumstances, it has been desired to provide a work machine that can reduce the load on the engine when the machine body is turned by the crawler traveling device.

The work machine according to the present invention is:
The engine mounted on the aircraft,
A pair of left and right crawler travel devices driven by the power of the engine to cause the airframe to self-run;
A blower fan for cooling the engine driven by power of the engine;
Wherein during a turn of the machine body by a pair of right and left crawlers, and a pressure relief unit for executing reduce the load of the engine caused by the driving of the blowing fan, is provided, et al is,
In the blower fan,
A rotating shaft driven by the power of the engine;
A plurality of rotating blades extending in a radial direction of the rotating shaft;
From the normal rotation state in which the rotational power of the engine is transmitted to the rotating shaft as it is, the rotational power of the engine is reversed through a substantially non-transmission state in which the rotational power of the engine is not substantially transmitted to the rotational shaft. A belt transmission type switching mechanism that switches the state of the rotation shaft over the reverse rotation state transmitted to the rotation shaft.
The substantially non-transmission state is a state different from a complete non-transmission state in which the rotational power of the engine is not transmitted to the rotation shaft,
The load reducing unit controls the switching mechanism so as to be in the substantially non-transmission state when the airframe is turned by the pair of left and right crawler traveling devices .

  According to the present invention, the load reducing unit reduces the engine load caused by the driving of the equipment when the aircraft is turned by the pair of left and right crawler traveling devices. For example, when the aircraft is turning, the crawler traveling device inside the turning is pulled by the crawler traveling device outside the turning and the power required for the crawler traveling device increases, or the crawler traveling device inside the turn is braked. The power for braking increases. According to the present invention, even if the engine load caused by the crawler traveling device increases when the aircraft is turning, the engine load generated by driving the device is reduced, so that the peak engine load can be preferably reduced. As a result, an engine having a smaller output than before can be employed, which can contribute to the miniaturization of the engine, which is advantageous in terms of energy saving and compliance with exhaust gas regulations.

Furthermore, since the air blower for cooling the engine is subjected to air resistance when the cooling air is generated, the load of the engine that is a power source increases when the cooling air is generated by the blower fan. Therefore, according to the present invention, during turning of the aircraft by a pair of right and left crawler traveling apparatus tends to load the engine is maximized, the pressure relief unit, temporarily suspend such an occurrence of the cooling air due to wind fan feed Thus, the engine load is reduced by the blower fan. As a result, during normal times when the engine load is not so large, the engine is cooled by the cooling air generated by the blower fan, and the pair of left and right crawler travel devices tend to have the largest engine load during turning of the aircraft The engine load by the blower fan is reduced. Therefore, the engine can be suitably cooled by the blower fan, and the load on the engine can be suitably reduced by reducing the required power at the peak time by the amount of the blower fan.

In the above configuration,
A steering lever for performing a steering operation of the pair of left and right crawler travel devices based on a swing angle is provided;
The load reducing unit determines that the aircraft is turning by the pair of left and right crawler traveling devices when the condition that the swing angle of the steering lever is swung more than a predetermined angle is satisfied. Is preferred.

According to this configuration, when the steering lever that performs the steering operation of the pair of left and right crawler travel devices is swung by less than a predetermined angle, it is not determined that the aircraft is turning. When the steering lever is swung by less than a predetermined angle, the aircraft's course is changed only slightly. Compared to when the aircraft is traveling straight ahead, the pair of left and right crawler traveling devices The resulting engine load does not increase that much. For this reason, when the condition that the swing angle of the steering lever is swung more than a predetermined angle is satisfied, the load reducing unit determines that the aircraft is turning, for example, using a potentiometer. The turning angle of the airframe can be determined by detecting the swing angle of the lever, and the load on the engine caused by the driving of the blower fan by the load reducing unit can be suitably reduced.

In the above configuration,
A steering lever for performing a steering operation of the pair of left and right crawler travel devices based on a swing angle is provided;
The load reducing unit preferably determines that the aircraft is turning by the pair of left and right crawler travel devices when the condition that the steering lever is at the lever end is satisfied.

According to this configuration, when the steering lever that performs the steering operation of the pair of left and right crawler traveling devices is not at the lever end, it is not determined that the aircraft is turning. When the steering lever is not at the lever end, the aircraft's course is changed only slightly, and the engine load caused by the pair of left and right crawler traveling devices compared to when the aircraft is traveling straight ahead. Does not increase that much. For this reason, only when the condition that the steering lever is at the lever end is satisfied, it is determined that the airframe is turning, so that the air blowing by the load reducing unit can be performed without causing unnecessary stop of the air blowing fan. It is possible to suitably reduce the engine load caused by driving the fan .
The “lever end” includes a complete lever end and a position near the complete lever end.

In the above configuration,
The load reducing unit is configured to rotate the airframe by the pair of left and right crawler traveling devices when a speed difference occurs between the one crawler traveling device and the other crawler traveling device. It is preferable to determine that this has been done.

According to this configuration, when there is a speed difference between one crawler traveling device and the other crawler traveling device for the pair of left and right crawler traveling devices, the pair of left and right crawler traveling devices turns the body. It is judged that For this reason, since the turning of the airframe can be directly determined based on the speed of the crawler traveling device, the turning of the airframe can be accurately determined, and the engine load caused by the driving of the blower fan by the load reducing unit is preferably reduced. sell.

In the above configuration,
A threshing device is provided to thresh the harvested cereal meal.
When the condition that the threshing device is being driven is satisfied, it is preferable that the load reducing unit reduces the load on the engine caused by driving the blower fan .

  An example of a work vehicle is a combine that harvests crops. The combine is provided with a cutting unit that is driven by the power of the engine and that cuts the planted culm, and a threshing device that threshs the harvested culm. In the combine, after the aircraft is run straight and the planted culm of a certain row is cut off, the vehicle is turned to cut the planted culm adjacent to the strip after cutting. Immediately after the turning of the airframe, the threshing device may be driven in order to thresh a certain grain of cereal that has been harvested. In this case, since the engine is loaded with both a load caused by the crawler traveling device during turning and a load caused by the threshing device, the engine load tends to be the largest.

According to this configuration, when the condition that the threshing device for threshing the harvested cereal mash is driven, the load reduction unit reduces the engine load caused by the driving of the blower fan . Thereby, when turning the machine body by the pair of left and right crawler traveling devices, when the engine load that the threshing device is driven becomes the largest, the load on the engine caused by the driving of the blower fan can be suitably reduced.

In the above configuration,
The threshing device is equipped with a processing amount detection sensor for detecting the amount of processed material in the threshing device,
It is preferable that the load reduction unit executes the reduction of the engine load caused by the driving of the blower fan when the processing amount detection sensor satisfies a condition that a processing amount of a predetermined amount or more is detected. .

  Some threshing devices are equipped with a processing amount detection sensor for detecting the amount of processed material in the threshing device. Detection of a processed product of a predetermined amount or more by the processing amount detection sensor is an indicator that the engine load caused by the threshing device is increased.

According to this configuration, when the processing amount detection sensor satisfies the condition that it detects a processed object of a predetermined amount or more, the load reduction unit reduces the engine load caused by driving the blower fan. . Thereby, when the engine load resulting from the threshing device is large, the engine load generated by the driving of the blower fan can be reduced appropriately.

In the above configuration,
It is preferable that the load reducing unit executes the reduction of the engine load caused by driving the blower fan when the engine speed satisfies a condition that the engine speed is equal to or higher than a predetermined speed.

The blower fan driven by the engine power is driven when the engine speed is equal to or higher than the predetermined speed, and is not driven when the engine speed is lower than the predetermined speed.

According to this configuration, when the rotational speed of the engine satisfies the condition that more than a predetermined rotation speed, i.e., when the blower fan is driven, reduce the load of the engine caused by the driving of the blower fan is performed.

In the above configuration,
It is preferable that the load reducing unit reduces the load on the engine caused by driving the blower fan when the traveling speed of the airframe by the pair of left and right crawler traveling devices satisfies a condition that the traveling speed is equal to or higher than a predetermined speed.

According to this configuration, when the traveling speed of the aircraft is less than a predetermined speed, it can be considered that the engine load is not so large, so when satisfying the condition that the traveling speed of the aircraft by the pair of left and right crawler traveling devices exceeds the predetermined speed, Reduction of the engine load caused by driving the blower fan is executed. Thereby, reduction of the engine load caused by the blower fan can be executed only when the engine load is large.

In the above configuration,
A cutting part for cutting the planted culm is provided, and a culm detection sensor for detecting the culm cut by the cutting part is provided,
It is preferable that the load reduction unit executes the reduction of the engine load caused by the driving of the blower fan based on the detection state of the grain detection sensor.

  An example of a work vehicle is a self-removing combine that harvests crops. The self-decomposing combine is provided with a reaping unit that is driven by the power of the engine to harvest the planted cereal and a threshing device that threshs the harvested cereal. Moreover, the culm detection sensor which detects the culm harvested in the cutting part is provided. When the cereal detection sensor is in the detection state, the reaped cereal is present in the reaping part and the reaping part and the threshing device are driven. In a self-detaching combine, after the aircraft has been driven straight to cut off a certain row of planted cereal, the aircraft is swiveled to harvest the row of planted corn that is adjacent to the strip that has been trimmed. . Immediately after the turning of the airframe, the threshing device may be driven in order to thresh a certain grain of cereal that has been harvested. In this case, since the engine is loaded with both a load caused by the crawler traveling device during turning and a load caused by the threshing device, the engine load tends to be the largest.

According to this structure, the load reduction part reduces the load of the engine which arises by the drive of an air blower fan based on the detection state of a grain detection sensor. Thus, when the engine is turned by the pair of left and right crawler travel devices, when the engine load is maximum, that is, the cutting part and the threshing device are driven, the engine load caused by driving the blower fan is suitably reduced. it can.

It is a whole side view of the ordinary combine which is an example of a working machine. It is a whole top view of the normal type combine which is an example of a working machine. It is explanatory drawing which shows the vicinity of an engine room in front view, and a control structure collectively. It is a longitudinal cross-sectional view which shows when the rotary blade of the normal / reverse flow fan which is an example of a ventilation fan exists in a normal flow position. It is a longitudinal cross-sectional view which shows when the rotary blade of the normal / reverse flow fan which is an example of a ventilation fan exists in a neutral position. It is a longitudinal cross-sectional view which shows when the rotary blade of the forward / reverse flow fan which is an example of a ventilation fan exists in a backflow position. It is explanatory drawing which shows the forward / reverse flow fan which is an example of a ventilation fan by planar view, (a) is when a rotary blade is in a normal flow position, (b) is when a rotary blade is in a neutral position, (c) is The time when the rotary blade is in the backflow position is shown. It is a power transmission diagram. It is a schematic diagram which shows the mode at the time of turning of the body by a crawler traveling apparatus. It is a flowchart. It is explanatory drawing which shows the normal rotation fan which is an example of the ventilation fan in another embodiment by a side view, (a) is in a normal rotation state, (b) is in a non-transmission state, (c) is reverse rotation When in a state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Schematic configuration of ordinary combine]
FIG. 1 and FIG. 2 show a normal combine (an example of “work machine”) that harvests crops. The ordinary combine includes an airframe 11 supported by the crawler travel device 10, a cutting part 12 disposed so as to be movable up and down in front of the airframe 11, a driving control section 13 disposed at an upper center side of the airframe 11, and the airframe 11. , A threshing device 15 disposed on the rear left side of the body 11, and a grain tank 16 disposed on the rear right side of the body 11.

  The crawler travel device 10 shown in FIG. 1 is arranged in a pair of left and right (see FIG. 8), and is configured to cause the airframe 11 to self-run. The crawler traveling device 10 pivotally supports a drive wheel 18, a driven wheel 19, and a plurality of idle wheels 20 on a track frame 17 supported by the airframe 11, and a drive wheel 18, a driven wheel 19, and a plurality of idle wheels 20. The crawler belt 21 is wound around. When the power is transmitted to the drive wheels 18, the crawler belt 21 is rotated, and a propulsive force is applied to the track frame 17 so that the airframe 11 travels.

  Further, as shown in FIG. 1, the crawler traveling device 10 is provided with an elevating mechanism 22 using a hydraulic cylinder at the front and rear, and the elevating mechanism 22 is transmitted by transmitting power to the elevating mechanism 22. Is driven, and the height width of the entire crawler traveling device 10 can be changed. By driving each lifting mechanism 22 provided in each of the left and right crawler traveling devices 10, the posture of the machine body 11 can be appropriately changed from front to back and left and right.

  As shown in FIG. 1 and FIG. 2, the harvested portion 12 is fed with a reel device 25 that rotates around the horizontal axis and scrapes the planted cereal, and a clipper-type cutting blade 26. A cutting and conveying device 28 that conveys the harvested cereals to the center side by the mowing and the laterally feeding auger 27 and a feeder 29 that conveys the harvested cereals from the laterally feeding auger 27 to the threshing device 15 are provided. The feeder 29 is internally provided with a chain-type scraping conveyor 30.

  As shown in FIG. 2, the threshing device 15 includes a handling cylinder 31 that is long in the front-rear direction and rotates around the front-rear axis. In the threshing device 15, the whole grain of the harvested cereal mash is put in, and the threshing process is performed by the rotational drive of the handling drum 31. The grain tank 16 shown in FIGS. 1 and 2 is configured to store the grains threshed by the threshing device 15. The grain stored in the grain tank 16 can be discharged to the outside by a discharge mechanism 32 that conveys the grain by driving a screw.

  As shown in FIGS. 1 and 2, the driving control unit 13 includes a driving seat 33 on which a driver is seated, a steering lever 34 that performs a steering operation of the left and right crawler travel devices 10, and the like. Yes. The steering lever 34 is urged so as to automatically return to the neutral posture, and is configured to perform the steering operation of the pair of left and right crawler travel devices 10 based on the swing angle in the left and right direction. The steering lever 34 is provided with a lever sensor 35 that can detect a lever end E having a maximum swing angle in the left-right direction (see FIG. 3). The lever sensor 35 can be configured by a limit sensor, a potentiometer, or the like.

  As shown in FIG. 1 and FIG. 3, the prime mover 14 is located at the lower part of the driving control unit 13 and includes an engine 37 covered with a hood 36. The engine 37 is a water-cooled diesel engine mounted on the airframe 11 in a horizontal posture, and a main output shaft 38 extends inward of the airframe 11 and a secondary output shaft 39 extends outward of the airframe 11. ing. The crawler traveling device 10, the reaping unit 12, and the threshing device 15 are driven by the power output from the main output shaft 38 of the engine 37 (see FIG. 8).

  As shown in FIG. 3, a radiator 40 is erected on the right side of the engine 37, and a forward and reverse flow fan 41 (“blower” for cooling the engine 37 is interposed between the engine 37 and the radiator 40. An example of a “fan” is provided. The forward / reverse fan 41 is driven by the power output from the auxiliary output shaft 39 of the engine 37 (see FIG. 8).

  As shown in FIGS. 1 and 3, a dust-proof cover 42 is provided on the right side of the bonnet 36. The dust-proof cover 42 is provided with a dust-proof net 42 a covering the substantially entire right side wall of the bonnet 36. When air is sucked in from the outside by the forward and reverse flow fans 41, the sucked air passes through the dust net 42 a and enters the bonnet 36, passes through the radiator 40 and the engine 37, cools, and then left on the bonnet 36. Discharged from the direction.

[Structure of forward and reverse flow fan]
As shown in FIGS. 3 to 7, the forward and reverse flow fan 41 is connected to the sub output shaft 39 of the engine 37 and rotated by the power of the engine 37, and the radial direction of the rotary shaft 47. And a plurality of plate-like rotary blades 48 extending to the rotary shaft 47 and an angle changing mechanism 49 that changes the angle of the rotary blades 48 with respect to the rotary shaft 47. Power is transmitted from the auxiliary output shaft 39 of the engine 37 to the rotating shaft 47 of the forward / backflow fan 41, and the forward / backflow fan 41 is included in “device A” driven by the power of the engine 37. It is.

  As shown in FIG. 3, the auxiliary output pulley 39a of the auxiliary output shaft 39 of the engine 37, the pump input pulley 51a attached to the pump shaft 51 of the water pump 50, and the input shaft of a generator (not shown) A transmission belt 52 is wound around the pulley, and the power of the auxiliary output shaft 39 is transmitted to the pump shaft 51 via the transmission belt 52. The rotating shaft 47 of the forward / backflow fan 41 is configured to rotate integrally with the pump shaft 51. For this reason, the rotating shaft 47 is rotationally driven by the power of the auxiliary output shaft 39 of the engine 37.

  4 to 6, a cylindrical rotation base 53 is fixed to the pump input pulley 51a. A rotation cam body 54 is fixed to the rotation base 53, and the rotation cam body 54 is fixed. A receiving member 55 is fixed to the base plate. A plurality of guide pins 56 are fixed to the rotating cam body 54, and the guide pins 56 are slidably inserted into a plurality of axial boss portions 57a of a disk-shaped rotating body 57. A ring-shaped operation member 59 is attached to the rotating body 57 via a bearing 58. The operation member 59 is engaged with a bifurcated end portion 61 a of an operation fork 61 that is swingably supported around the support pin 60. A compression spring 62 that biases the rotating body 57 to move toward the engine 37 is interposed between the rotating body 57 and the receiving member 55.

  An end portion of the rotary blade 48 is connected to one end portion of a support shaft 63 rotatably supported by a radial boss portion 57b along the radial direction of the rotary shaft 47 formed on the rotary body 57, and the support shaft One end of the operating body 64 is connected to the other end of 63. An engaging pin 64 a is provided at the other end of the operating body 64, and the engaging pin 64 a is engaged with a cam portion 54 a formed at the end of the rotating cam body 54. In this way, a plurality of (for example, seven) rotating blades 48 are provided at equal intervals in the circumferential direction of the rotating shaft 47.

  The operation fork 61 swings around the support pin 60 to bring the operation member 59, the rotating body 57, and the support shaft 63 closer to and away from the engine 37. One end of a pull wire 65 is connected to the operation fork 61 at an end of the operation arm 61 b opposite to the bifurcated end 61 a across the support pin 60.

  As shown in FIG. 3, the other end of the pull wire 65 is connected to a sector gear 66 provided on the rear side of the engine 37. The sector gear 66 is meshed with a pinion 68a that is driven by an electric motor 68 that can be driven forward and reverse with a speed reduction mechanism.

  When the pull wire 65 is pulled by driving the electric motor 68, as shown in FIGS. 6 and 7C, the operation fork 61 is swung around the support pin 60, and the bifurcated end portion of the operation fork 61 is obtained. 61 a is separated from the engine 37. As a result, the operating body 64, the rotating body 57, and the support shaft 63 are moved along the guide pins 56 toward the side away from the engine 37 by the bifurcated end portion 61 a against the urging force of the compression spring 62. Is done. At that time, as the support shaft 63 moves, the position of the engaging pin 64a engaged with the cam portion 54a of the rotating cam body 54 is changed with respect to the rotating body 57, whereby the operating body 64, the support shaft 63, The rotary blade 48 is rotated. As a result, the rotary blade 48 moves from the normal flow position P1 (see FIGS. 4 and 7A) through the neutral position P2 (see FIGS. 5 and 7B) to the reverse flow position P3 (see FIGS. 6 and 7). c) position). The neutral position P2 includes a complete neutral position and a position near the complete neutral position.

  On the other hand, when the pull wire 65 is returned by driving the electric motor 68, the operating fork 61 is swung around the support pin 60 as shown in FIGS. The end portion 61 a is approached to the engine 37. As a result, the operating body 64, the rotating body 57, and the support shaft 63 are moved to the side closer to the engine 37 along the guide pin 56 by the urging force of the compression spring 62 by the bifurcated end portion 61 a. At that time, as the support shaft 63 moves, the position of the engaging pin 64a engaged with the cam portion 54a of the rotating cam body 54 is changed with respect to the rotating body 57, whereby the operating body 64, the support shaft 63, The rotary blade 48 is rotated. As a result, the rotary blade 48 moves from the backflow position P3 (see FIGS. 6 and 7C) to the forward flow position P1 (see FIGS. 4 and 7B) via the neutral position P2 (see FIGS. 5 and 7B). The position is changed to a).

  Further, when the pull wire 65 is pulled halfway by driving the electric motor 68, the wind surface 48a of the rotary blade 48 is substantially the same as the axial direction of the rotary shaft 47, as shown in FIGS. It is located at a neutral position P2 that is orthogonal.

  The angle changing mechanism 49 is thus configured by the electric motor 68, the pull wire 65, the operation fork 61, the rotating body 57, and the like.

  As described above, the rotating blades 48 of the forward / reverse flow fan 41 are neutral positions where no wind is generated from the forward flow position P1 (see FIGS. 4 and 7A) where air is sucked from the outside by the angle changing mechanism 49. The position can be changed over the backflow position P3 (see FIGS. 6 and 7C) for discharging air to the outside via P2 (see FIGS. 5 and 7B). The rotary shaft 47 is configured to be driven to rotate in the same direction when the rotary blade 48 is in any of the forward flow position P1, the neutral position P2, and the reverse flow position P3.

  When the load on the engine 37 is not so large, the forward / reverse fan 41 moves the rotary blade 48 between the forward flow position P1 (see FIGS. 4 and 7A) and the reverse flow position P3 (FIGS. 6 and 7C). And (refer to FIG. 5) are alternately switched at fixed intervals.

  That is, the forward / reverse flow fan 41 is basically driven with the rotating blades 48 set to the forward flow position P1 as shown in FIGS. 4 and 7A, and sucks air from the outside into the machine. The engine 37 is configured to be cooled. Then, at regular intervals (for example, 3 minutes), the rotary blade 48 is repositioned from the normal flow position P1 to the reverse flow position P3 via the neutral position P2, and rotated as shown in FIGS. The blade 48 is driven for a short time (for example, several seconds) with the backflow position P3, and is controlled so that air is discharged from the inside of the machine to the outside, and dust such as scum adhering to the dust cover 42 is blown out of the body 11. ing. The forward / reverse flow fan 41 returns the rotary vane 48 from the reverse flow position P3 to the normal flow position P1 via the neutral position P2 after the driving to bring the rotary vane 48 to the reverse flow position P3 is completed. Thus, the forward / reverse flow fan 41 is basically driven by changing the angle of the rotary blade 48 at regular intervals between the forward flow position P1 and the reverse flow position P3 with the neutral position P2 in between.

[Power transmission from the engine]
As shown in FIG. 8, the driving force output from the main output shaft 38 of the engine 37 is transmitted to the threshing device 15 and is also shifted by the transmission device 70 to the crawler traveling device 10 and the cutting unit 12. Communicated. The transmission device 70 includes a main transmission HST 71 (hydrostatic continuously variable transmission), an auxiliary transmission 72, a side clutch brake 73, a parking brake 74, and an intermediate gear mechanism 75. It has been.

  The main output shaft 38 of the engine 37 and the input shaft 15a of the threshing device 15 are linked by a transmission belt 15b. The driving force of the engine 37 is a feed chain (not shown), a handling cylinder 31 (see FIG. 2), It is transmitted to the illustrated sorting device or the like. The main output shaft 38 of the engine 37 and the input shaft 76 of the HST 71 are also linked by a transmission belt, and the driving force of the engine 37 is transmitted to the HST 71 and then branched to the crawler travel device 10 and the cutting unit 12. Is transmitted.

  The HST 71 is accommodated in a transmission case 78 disposed adjacent to the mission case 77. The HST 71 is provided with an axial plunger type hydraulic pump 79 having a variable capacity, and an axial plunger type hydraulic motor 80 driven by pressure oil from the hydraulic pump 79. The input shaft 76 is connected to the hydraulic pump 79 and is rotatably supported by the transmission case 78. The driving force of the engine 37 transmitted to the HST 71 is converted into a forward driving force or a backward driving force by the hydraulic pump 79 and the hydraulic motor 80, and is output from the speed change output shaft 81 connected to the hydraulic motor 80. The HST 71 can change the driving force steplessly on both the forward side and the reverse side.

  The auxiliary transmission 72 includes a first auxiliary transmission shaft 83 to which driving force from the transmission output shaft 81 is transmitted from the input gear 82, a first medium speed gear 84 provided on the first auxiliary transmission shaft 83, a first The high-speed gear 85, the first low-speed gear 86, the first shifter 87, the second shifter 88, the second auxiliary transmission shaft 89 arranged in parallel to the first auxiliary transmission shaft 83, and the second auxiliary transmission shaft 89 are provided. A second medium speed gear 90, a second high speed gear 91, and a second low speed gear 92 are provided. In the sub-transmission device 72, the first shifter 87 and the second shifter 88 are operated by a sub-transmission lever (not shown), whereby a first driving force is transmitted from the first sub-transmission shaft 83 to the second sub-transmission shaft 89. The medium speed gear 84, the first high speed gear 85, and the first low speed gear 86 are switched to realize a three-stage shift to low speed, medium speed, and high speed.

  The second medium speed gear 90 has substantially the same diameter as that of the first medium speed gear 84, and the first medium speed gear 84 and the second medium speed gear 90 are disposed at the same position in the axial direction, and are always in contact with each other. Biting. As a result, a driving force can be transmitted from the first medium speed gear 84 to the second medium speed gear 90, and a “medium speed” deceleration system with almost no deceleration is formed. The second high speed gear 91 has a smaller diameter than the first high speed gear 85, and the first high speed gear 85 and the second high speed gear 91 are disposed at the same position in the axial direction and always mesh with each other. As a result, a driving force can be transmitted from the first high speed gear 85 to the second high speed gear 91, and a "high speed" reduction system having a reduction ratio smaller than that of the "medium speed" reduction system is formed. . The second low speed gear 92 has a larger diameter than the first low speed gear 86, and the first low speed gear 86 and the second low speed gear 92 are disposed at the same position in the axial direction and are always meshed with each other. . As a result, a driving force can be transmitted from the first low-speed gear 86 to the second low-speed gear 92, and a "low speed" speed reduction system having a larger reduction ratio than the "medium speed" speed reduction system is formed. .

  The second high speed gear 91 is always engaged with the center gear 93 of the side clutch brake 73, and all the driving force shifted by the auxiliary transmission 72 is transmitted to the center gear 93 via the second high speed gear 91.

  The side clutch brake 73 includes a side clutch shaft 94, a center gear 93, left and right clutch sleeves 95, left and right friction disks 96, and left and right brake shifters 97. The side clutch shaft 94 is supported by the transmission case 77 in a posture parallel to the second auxiliary transmission shaft 89. The center gear 93 is externally inserted in the vicinity of the center of the side clutch shaft 94 so as not to be relatively rotatable and slidable, and the driving force from the auxiliary transmission device 72 is transmitted via the second high speed gear 91. . The left and right clutch sleeves 95 are externally attached to the side clutch shaft 94 so as to be rotatable relative to the left and right sides of the center gear 93 and to be slidable. The left and right friction disks 96 are externally mounted on the side clutch shaft 94 and are pressed by the movement of the clutch sleeve 95 to generate a frictional force, thereby applying a braking force (braking force) to the clutch sleeve 95. The brake shifter 97 is linked to the steering lever 34 and a stop pedal (not shown), and is attached to the outer periphery of the clutch sleeve 95, and is operated by operating the steering lever 34 to the left or right or pressing the stop pedal (not shown). The left and right clutch sleeves 95 are moved to the friction disk 96 side separately or simultaneously.

  A tooth portion is formed on the inner end side of the clutch sleeve 95 (the center side of the transmission case 77), and tooth portions are also formed on both side portions of the center gear 93, and a so-called dog clutch is constituted by both tooth portions. The left and right clutch sleeves 95 are provided with an output gear 99 that is always meshed with the intermediate gear 98 of the intermediate gear mechanism 75. When the teeth of the clutch sleeve 95 mesh with the teeth of the center gear 93, the clutch is engaged (transmission state), and the clutch gear rotates integrally with the center gear 93. ”,“ Medium speed ”, and“ high speed ”are shifted to the crawler travel device 10 via the intermediate gear mechanism 75.

  Further, the clutch sleeve 95 slides in a direction away from the center gear 93 and the engagement between the teeth of the center gear 93 and the teeth of the clutch sleeve 95 is released. The transmission system of the driving force to the travel device 10 is disconnected, and when the clutch sleeve 95 slides in a direction away from the center gear 93 and the clutch sleeve 95 presses the friction disk 96, the braking force is applied to the clutch sleeve 95. The crawler traveling device 10 is braked.

  For example, when the steering lever 34 (see FIG. 3) is operated from the neutral position to the left side, the clutch sleeve 95 on the left side is slid to move to the “clutch disengaged state” at the initial stage of the operation and turn. A “slow turn” with a certain radius is achieved. Further, when the steering lever 34 is largely operated to the left side, the left clutch sleeve 95 is further slid, whereby the left crawler traveling device 10 is braked, and the turning radius is smaller than that of “slow turning”. “Shinjuku turning” appears. Further, when the steering lever 34 is operated from the neutral position to the right side, the right clutch sleeve 95 is actuated, and the “slow turn” and the “certain turn” are performed with the right crawler traveling device 10 as the turning inner side. Are similarly realized.

  In such a configuration, for example, as shown in FIG. 9, immediately after cutting the planted cereal of the strip in which the machine body 11 travels straight, for example, planting of the uncut region U adjacent to the strip When the body 11 is turned by the crawler travel device 10 by “slow turning”, “successful turning” or the like while the cutting unit 12 and the threshing device 15 are driven in order to cut the cereal, the load applied to the engine 37 Becomes very large. For this reason, when the load of the engine 37 is increased when the body 11 is turned by the crawler traveling device 10, the load of the engine 37 caused by the forward / reverse flow fan 41 that is the device A driven by the power of the engine 37 is reduced. Control is performed.

[Abnormality monitoring unit]
As shown in FIG. 3, the ordinary combine is provided with an abnormality monitoring unit 100 that monitors an abnormality of a device such as the threshing device 15 and issues an alarm by voice or visual information when an abnormality occurs. Examples of the abnormality of the threshing device 15 include a state in which clogging of a processed product occurs in the threshing device 15.

[Control configuration to reduce engine load]
As shown in FIG. 3, the ordinary combine according to the present invention includes a control unit 101 (corresponding to a “load reduction unit”) that is an ECU that performs control to reduce the load on the engine 37. . The control unit 101 is configured to reduce the load on the engine 37 generated by driving the forward and backward flow fans 41 when the body 11 is turned by the pair of left and right crawler traveling devices 10.

  When the load on the engine 37 increases, the control unit 101 reduces the load on the engine 37 caused by the forward / backflow fan 41 that is the device A. The control unit 101 includes a rotation sensor 102 that detects the number of revolutions of the engine 37, information from the abnormality monitoring unit 100, information about turning on and off of the threshing clutch in the threshing device 15, and a lever that detects the operation of the steering lever 34. Information of the sensor 35 is input. The control unit 101 controls the electric motor 68 on the basis of information input from the rotation sensor 102, the abnormality monitoring unit 100, and the threshing device 15, so that the rotary blade 48 of the forward and reverse flow fan 41 is in the neutral position P2 (FIGS. 5 and 5). 7 (b)).

  When the condition that the swing angle of the steering lever 34 is swung more than a predetermined angle is satisfied, the control unit 101 determines that the body 11 is turning by the pair of left and right crawler travel devices 10. That the swing angle of the steering lever 34 is swung more than a predetermined angle is determined by detecting that the steering lever 34 is at the lever end E by the lever sensor 35. The lever end E includes a complete lever end and a position near the complete lever end.

  Moreover, the control part 101 reduces the load of the engine 37 which arises by the drive of the apparatus A, when the threshing clutch not shown is turned on and the conditions that the threshing device 15 is driven are satisfied. The control unit 101 reduces the load on the engine 37 caused by the driving of the device A when the rotational speed of the engine 37 satisfies a condition that the rotational speed of the engine 37 is equal to or higher than a predetermined rotational speed such as the idling rotational speed of the engine 37, for example.

[Operation by control unit]
As shown in FIG. 9, first, the state of the steering lever 34 is detected by the lever sensor 35, and it is determined whether or not the body 11 is turning (step # 1). If it is determined that the body 11 is turning (step # 1: YES), it is next determined whether or not the rotational speed of the engine 37 is equal to or higher than a predetermined rotational speed (step # 2). On the other hand, if it is determined that the body 11 is not turning (step # 1: NO), the process returns to step # 1.

  If it is determined that the rotational speed of the engine 37 is equal to or higher than the predetermined rotational speed (step # 2: YES), it is next determined whether or not the threshing device 15 is in the on state (step # 3). On the other hand, when it is determined that the rotational speed of engine 37 is not equal to or higher than the predetermined rotational speed (step # 2: NO), the routine returns.

  If it is determined that the threshing device 15 is in the driving state (step # 3: YES), it is next determined whether or not an abnormality is detected by the abnormality monitoring unit 100 (step # 4). On the other hand, if it is determined that the threshing device 15 is not in the driving state (step # 3: NO), the process returns.

  If the abnormality monitoring unit 100 determines that no abnormality is detected (step # 4: YES), the forward / reverse flow fan 41 is controlled to be in a neutral state for a certain period of time (step # 5), and thereafter the forward / reverse flow fan. 41 is returned to the normal state (the state in which normal control is performed) (step # 6), and the process returns. On the other hand, if it is determined by the abnormality monitoring unit 100 that an abnormality has been detected (step # 4: NO), the process returns.

  Thereby, when the body 11 is turned by the crawler traveling device 10, the rotational speed of the engine 37 is equal to or higher than the predetermined rotational speed, the threshing device 15 is driven, and an abnormality is detected by the abnormality monitoring unit 100. Is not detected, the rotary blade 48 of the forward and reverse flow fan 41 is controlled to be in the neutral position P2. Thereby, when the load of the engine 37 becomes the maximum when the body 11 turns, only the load of the engine 37 caused by the forward / reverse flow fan 41 can be reduced, and the load of the engine 37 can be preferably reduced.

[Another embodiment]
(1) In the above embodiment, the forward / backflow fan 41 is controlled to be in a neutral state for a certain period of time, but is not limited thereto. For example, when the lever sensor 35 is a limit sensor, the forward / reverse flow fan 41 may be maintained in a neutral state until the steering lever 34 is not detected by the limit sensor. Further, when the lever sensor 35 is a potentiometer, the forward / backflow fan 41 may be maintained in a neutral state until the potentiometer reaches an angle within a certain range near the neutral position of the steering lever 34.

  (2) In the above-described embodiment, the forward / reverse flow fan 41 that changes the wind direction by changing the angle of the rotary blade 48 is shown as an example of the “blower fan”, but is not limited thereto. As the “blower fan”, for example, a forward / reverse fan 141 as shown in FIG. 11 may be provided. The forward / reverse fan 141 is provided with a rotating shaft 147 driven by the power of the engine 37 and a plurality of rotating blades 148 extending in the radial direction of the rotating shaft 147. Then, the rotational power of the engine 37 is not transmitted to the rotational shaft 147 from the forward rotation state Q1 (see FIG. 11A) in which the rotational power of the engine 37 is transmitted to the rotational shaft 147 as it is. The state of the rotating shaft 147 over the reverse rotation state Q3 (see FIG. 11C) in which the rotational power of the engine 37 is reversed and transmitted to the rotating shaft 147 through the non-transmission state Q2 (see FIG. 11B). And a switching mechanism 149 for switching between. The non-transmission state Q2 includes a complete non-transmission state and a substantially non-transmission state.

  Specifically, a first rotation pulley 147 a is attached to the rotation shaft 147. Further, a second rotation pulley 147b that is not linked to the rotation shaft 147 is provided concentrically with the first rotation pulley 147a. A sub output pulley 39 a is attached to the sub output shaft 39 of the engine 37. A power generation pulley 150a is attached to a power generation input shaft 150 of a generator (not shown). A first transmission belt 151 is wound around the second rotation pulley 147b, the sub output pulley 39a, and the power generation pulley 150a. In addition, a first swing pulley 152 that can swing around a rotation shaft 147 and a second swing pulley 153 that swings together with the first swing pulley 152 are provided. A second transmission belt 154 is wound around the first rotation pulley 147a, the first swing pulley 152, and the second swing pulley 153. The first transmission belt 151, the first swing pulley 152, the second swing pulley 153, the second transmission belt 154, the first rotation pulley 147a, and the like constitute the switching mechanism 149.

  When the first swing pulley 152 is brought into contact with the inside of the first transmission belt 151, the second transmission belt 154 is rotated in the forward direction, and the rotation shaft 147 is moved in the forward direction via the first rotation pulley 147a. A normal rotation state Q1 (see FIG. 11A) to be rotated appears. Further, if the first swing pulley 152 and the second swing pulley 153 are not in contact with the first transmission belt 151, the second transmission belt 154 is not rotated and the rotation shaft 147 is not rotated. (See FIG. 11B) appears. Further, when the second swinging pulley 153 is brought into contact with the outside of the first transmission belt 151, the second transmission belt 154 is rotated in the reverse direction opposite to the normal direction, and the first rotation pulley 147a is interposed, A reverse rotation state Q3 (see FIG. 11C) in which the rotation shaft 147 is rotated in the reverse direction appears.

  In this other embodiment, the control unit 101 swings the first swing pulley 152, the second swing pulley 153, and the like during the turning of the body 11 by the pair of left and right crawler travel devices 10, thereby rotating the pivot shaft 147. Controls the switching mechanism 149 so as to be in the non-transmission state Q2. As a result, the load on the engine 37 caused by the forward / reverse rotation fan 141 can be suitably reduced when the body 11 is turning.

  (3) In the above embodiment, the position of the rotary blade 48 of the “forward / reverse flow fan 41” that is the “blower fan” is changed, or the rotation shaft 147 of the “forward / reverse fan 141” that is the “blower fan” is rotated. Although an example is shown in which the load on the engine 37 caused by the “blower fan” is reduced by reversing the direction, the present invention is not limited to this. For example, by stopping the rotation of the rotation shaft 47 of the “forward / reverse flow fan 41” that is the “blower fan” or by stopping the rotation of the rotation shaft 147 of the “forward / reverse fan 141”, the “blower fan” You may reduce the load of the engine 37 resulting from this.

  (4) In the above embodiment, the position of the rotary blade 48 of the “forward / reverse flow fan 41”, which is a “blower fan”, is controlled to be the neutral position P2, but the present invention is not limited to this. ”May be controlled to a position in the vicinity of the neutral position P2. Further, in the above embodiment, the position of the rotary blade 148 of the “forward / reverse fan 141” which is the “blower fan” is controlled to be in the non-transmission state Q2, but the present invention is not limited to this. ”May be controlled so as to be positioned in the vicinity of the non-transmission state Q2.

  (5) In the above-described embodiment, an example in which the load reducing unit determines the turning of the airframe 11 based on the operation of the steering lever 34 is shown, but is not limited thereto. For example, when a significant speed difference is generated between one crawler traveling device 10 and the other crawler traveling device 10 for the pair of left and right crawler traveling devices 10, the load reducing unit is configured by the pair of left and right crawler traveling devices 10. It may be configured to determine that the airframe 11 is turning. At this time, the speed of the crawler traveling device 10 can be calculated, for example, by detecting the rotational speed of the drive wheels 18.

  (6) In the above embodiment, a plurality of conditions for reducing the load on the engine 37 caused by driving the device A are shown, but the present invention is not limited to this, and more conditions may be added.

  (6-1) For example, when the threshing device 15 is provided with a processing amount detection sensor that detects the amount of the processed product in the threshing device 15, the load reduction unit has a processing amount detection sensor equal to or greater than a predetermined amount. When the condition that the processed object is detected is satisfied, the load on the engine 37 generated by driving the device A may be reduced.

  (6-2) Further, for example, the load reducing unit reduces the load on the engine 37 generated by driving the device A when the traveling speed of the airframe 11 by the pair of left and right crawler traveling devices 10 satisfies a condition that the traveling speed is equal to or higher than a predetermined speed. May be configured to execute.

  (7) In the above-described embodiment, a normal combine that is an example of a “work machine” is shown. However, the present invention is not limited to this, and the “work machine” may be a self-removing combine. Although not shown in detail, the self-decomposing combine is provided with a harvesting unit for self-decomposing combine that harvests the planted cereal, and a stock sensor that detects the harvested culm in the harvesting unit, etc. A cereal detection sensor is provided. In this case, the control part 101 may be comprised so that the load of the engine 37 produced by the drive of an apparatus may be reduced based on the detection state of a grain candy detection sensor. When the harvested culm in the harvesting part is detected by the grain detection sensor, the harvesting part and the threshing device are in the drive state, and the load of the engine 37 caused by the harvesting part and the engine 37 caused by the threshing device There is a load. For this reason, when the machine body 11 is turning, when the harvested culm in the harvesting unit is detected by the culm detection sensor, the load on the engine 37 is increased, so that the load reducing unit drives the device A. It may be configured to reduce the load on the engine 37 caused by the above.

  (8) In the above embodiment, “blower fan” is shown as an example of “apparatus A”, but it is not limited to this. For example, the elevating mechanism 22 provided in the crawler traveling device 10 and driven by the power of the engine 37 may be the “device A”. In this case, the control of the lifting mechanism 22 may be stopped when the above condition is satisfied during the turning of the body 11. Thereby, the load of the engine 37 at the time of the turning of the body 11 can be reduced suitably.

  (9) In the above embodiment, a method of turning the crawler traveling device 10 inside the turn by turning off the power transmission or turning the crawler traveling device 10 inside the turn by applying a brake is shown as an example. However, it is not limited to this. For example, as the swing angle of the steering lever 34 is increased, the speed difference between the crawler traveling device 10 on the outer turning side and the crawler traveling device 10 on the inner turning side may be increased. .

  The present invention can be applied to other harvesting machines such as corn harvesting machines, tractors, paddy field working machines, lawn mowers, construction machines and the like in addition to the above-described ordinary combiners and self-removing combiners.

10: Crawler traveling device 11: Airframe 15: Threshing device 34: Steering lever 37: Engine 41: Forward / reverse fan (fan)
47: Rotating shaft 48: Rotating blade 49: Angle changing mechanism 101: Control unit (load reduction unit)
141: Forward / reverse fan (blower fan)
147: Rotating shaft 148: Rotating blade 149: Switching mechanism A: Device E: Lever end P1: Forward flow position P2: Neutral position P3: Backflow position Q1: Forward rotation state Q2: Non-transmission state Q3: Reverse rotation state

Claims (9)

The engine mounted on the aircraft,
A pair of left and right crawler travel devices driven by the power of the engine to cause the airframe to self-run;
A blower fan for cooling the engine driven by power of the engine;
Wherein during a turn of the machine body by a pair of right and left crawlers, and a pressure relief unit for executing reduce the load of the engine caused by the driving of the blowing fan, is provided, et al is,
In the blower fan,
A rotating shaft driven by the power of the engine;
A plurality of rotating blades extending in a radial direction of the rotating shaft;
From the normal rotation state in which the rotational power of the engine is transmitted to the rotating shaft as it is, the rotational power of the engine is reversed through a substantially non-transmission state in which the rotational power of the engine is not substantially transmitted to the rotational shaft. A belt transmission type switching mechanism that switches the state of the rotation shaft over the reverse rotation state transmitted to the rotation shaft.
The substantially non-transmission state is a state different from a complete non-transmission state in which the rotational power of the engine is not transmitted to the rotation shaft,
The load reducing unit controls the switching mechanism such that the load reducing unit is in a substantially non-transmission state when the machine body is turned by the pair of left and right crawler travel devices . A steering lever for performing a steering operation of the pair of left and right crawler travel devices based on a swing angle is provided;
The load reducing unit determines that the aircraft is turning by the pair of left and right crawler traveling devices when a condition that the swing angle of the steering lever is swung more than a predetermined angle is satisfied. The work machine according to claim 1 . A steering lever for performing a steering operation of the pair of left and right crawler travel devices based on a swing angle is provided;
3. The load reducing unit according to claim 1 , wherein when the condition that the steering lever is at a lever end is satisfied, the load reducing unit determines that the aircraft is turning by the pair of left and right crawler traveling devices. Work machine. The load reducing unit is configured to rotate the airframe by the pair of left and right crawler traveling devices when a speed difference occurs between the one crawler traveling device and the other crawler traveling device. The work machine according to any one of claims 1 to 3, which is determined to be performed. A threshing device is provided to thresh the harvested cereal meal.
The unloading unit, when the condition that the threshing apparatus is being driven, according to any one of claims 1 to 4 to perform a reduction in load of the engine caused by the driving of the blowing fan Work machine. The threshing device is equipped with a processing amount detection sensor for detecting the amount of processed material in the threshing device,
The unloading unit, the processing amount detecting sensor, when the condition that has detected a predetermined amount or more of the workpiece, claim executes reduce the load of the engine caused by the driving of the blowing fan 5 The working machine described in. 7. The load reducing unit according to any one of claims 1 to 6, wherein the load of the engine is reduced by driving the blower fan when a condition that the rotational speed of the engine is equal to or higher than a predetermined rotational speed is satisfied. The working machine described. The unloading unit is configured when the traveling speed of the machine body by a pair of right and left crawler traveling apparatus condition that more than a predetermined speed, to claim 1 to perform the reduction of load on the engine caused by the driving of the blowing fan The work machine according to any one of 7 . A cutting part for cutting the planted culm is provided, and a culm detection sensor for detecting the culm cut by the cutting part is provided,
The work machine according to any one of claims 1 to 8, wherein the load reduction unit executes reduction of a load on the engine that is generated by driving the blower fan based on a detection state of the grain detection sensor.

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