JP7183115B2 - work vehicle - Google Patents

Description

The present invention includes a drive source capable of rotating, a work device driven by the drive source, a transmission belt capable of transmitting power from the drive source to the work device, and a belt tension type capable of transmitting power to the transmission belt. and a working clutch ("clutch" in the literature).

For example, Patent Literature 1 discloses a working vehicle in which a working device (a “reaping unit”, a “threshing unit”, etc. in the literature) is driven by a drive source. A transmission belt ("belt" in the document) is interposed between the drive source and the work device, and the transmission belt transmits the power of the drive source and does not transmit the power of the drive source by the work clutch. can be switched to . When the transmission belt is switched to the state of transmitting the power of the drive source, the work clutch is operated after the rotation speed of the drive source is lowered. As a result, slippage of the transmission belt during switching of the transmission belt is reduced, and protection of the transmission belt is achieved.

JP-A-2005-178631

By the way, as shown in Patent Document 1, in a configuration in which the rotation speed of the drive source is lowered when the work clutch performs the switching operation of the transmission belt, after the operator first performs the switching operation of the transmission belt, the actual operation is performed. A time lag occurs until the switching of the transmission belt is completed. Therefore, depending on the length of this time lag, the operator may feel uncomfortable. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a work vehicle that achieves both protection of the transmission belt and comfortable operation of the operator.

A work vehicle according to the present invention includes a drive source capable of rotating, a work device driven by the drive source, a transmission belt capable of transmitting power from the drive source to the work device, and transmitting power to the transmission belt. A belt tension type work clutch that can be switched between a transmission state and a non-transmission state that does not transmit power to the transmission belt, an on control signal that is a control signal relating to an on operation of the work clutch, and a disengagement of the work clutch. a clutch operation unit capable of switching the work clutch between the transmission state and the non-transmission state based on the off control signal, which is the control signal related to operation; and a rotation speed capable of detecting the rotation speed of the drive source. A detection sensor is provided, and when the clutch operation unit detects the on control signal and the rotational speed is equal to or less than a preset threshold value, the clutch operation unit detects that the working clutch in the non-transmitting state to the transmission state, and if the rotational speed is higher than the threshold value when the clutch operation unit detects the ON control signal, the clutch operation unit detects that the rotational speed is the threshold value perform a first rotation speed control to reduce the rotation speed of the drive source so that the rotation speed of the drive source is reduced to the following, perform the transmission switching operation in a state where the rotation speed is equal to or less than the threshold value, and perform the transmission switching When the operation is completed, a second rotation speed control is performed to increase the rotation speed of the drive source so that the rotation speed becomes higher than the threshold value, and the rate of change per unit time of the rotation speed in the first rotation speed control and a second rate of change that is the rate of change per unit time of the rotational speed in the second rotational speed control, and the first rate of change is higher than the second rate of change is also small .

According to the present invention, when the rotational speed of the driving source is equal to or less than the preset threshold value, the clutch operation unit immediately switches the work clutch to the transmission state. The quickness of operation of the work clutch is ensured. Further, when the rotation speed of the drive source is higher than the threshold, the clutch operation unit switches the work clutch to the transmission state after the rotation speed of the drive source is lowered to the threshold or less, so that the transmission belt slips. is strongly reduced. In other words, according to the present invention, since the timing of switching operation of the work clutch is adjusted according to the rotation speed of the drive source, a work vehicle that achieves both protection of the transmission belt and comfortable operation of the operator is realized. be done. Further, for example, when the drive source is driving a device other than the working device, the driving load of the device is applied to the drive source, so that the rotation speed of the drive source suddenly decreases in accordance with the first rotation speed control. can be considered. In this case, if there is a sudden change in the operation of the drive source or the device, the operator may be surprised or feel uncomfortable. In this configuration, since the first rate of change is smaller than the second rate of change, the number of rotations when the number of rotations of the drive source is decreased is greater than the number of rotations when the number of rotations of the drive source is increased. change gradually. Therefore, even when a device other than the working device is driven, there is no abrupt change in the operation of the drive source or the device, and the fear that the operator will be surprised or feel uncomfortable is greatly reduced. In the present invention, the meaning of "when the number of revolutions is equal to or less than a preset threshold value" also includes the meaning of "when the number of revolutions is lower than a preset threshold value". Further, the meaning of "when the clutch operation unit detects the on-control signal and the rotational speed is higher than the threshold value" is defined as "when the clutch operation unit detects the on-control signal, the rotational speed is equal to or greater than the threshold". In addition, in the first rotation speed control of the present invention, the meaning of ``reducing the rotation speed of the drive source so that the rotation speed is equal to or less than the threshold value'' is replaced by ``so that the rotation speed is less than the threshold value. It also includes the meaning of "lowering the rotational speed of the driving source". Further, the "rotational speed of the driving source" in the present invention may be the target rotational speed for the driving source, or may be the rotational speed actually detected by the driving source.

In the present invention, when the transmission switching operation is completed in a state in which the first rotation speed control is performed and the rotation speed is equal to or lower than the threshold value, the clutch operation unit increases the rotation speed higher than the threshold value. It is preferable to perform a second rotation speed control for increasing the rotation speed of the drive source. Further, in the present invention, an accelerator operation tool for setting the rotation speed is provided, and the clutch operation unit performs the second rotation speed control so that the rotation speed reaches the set rotation speed of the accelerator operation tool. preferred.

With this configuration, even if the rotation speed of the drive source is lowered, the rotation speed of the drive source is automatically increased after the switching operation of the work clutch is completed. Therefore, compared to a configuration in which the worker manually increases the rotational speed of the drive source, the operator's annoyance is reduced, and the operability of the work clutch is firmly ensured. In addition, since the number of rotations of the drive source is increased to the set number of rotations of the accelerator operation tool after the switching operation of the work clutch is completed, the troublesomeness for the operator is further reduced.

In the present invention, it is preferable that the first rate of change is constant regardless of the rotational speed at the time when the clutch operation unit detects the on control signal.

A configuration in which the first rate of change is constant regardless of the number of rotations of the driving source makes the operation of the device more stable.

A work vehicle according to the present invention includes a drive source capable of rotating, a work device driven by the drive source, a transmission belt capable of transmitting power from the drive source to the work device, and transmitting power to the transmission belt. a belt tension type work clutch that can be switched between a transmission state in which power is transmitted to the transmission belt and a non-transmission state in which power is not transmitted to the transmission belt; an on control signal that is a control signal relating to an on operation of the work clutch; a clutch operation unit capable of switching the work clutch between the transmission state and the non-transmission state based on the control signal that is the control signal relating to the disengagement operation; and a rotation capable of detecting the number of revolutions of the drive source. and a number detection sensor, wherein when the clutch operation unit detects the on control signal and the rotational speed is equal to or less than a preset threshold value, the clutch operation unit detects that the work in the non-transmission state is stopped. If the transmission switching operation for putting the clutch in the transmission state is immediately performed and the rotational speed is higher than the threshold value when the clutch operating unit detects the on control signal, the clutch operating unit detects that the rotational speed is the performing a first rotational speed control to reduce the rotational speed of the drive source so that it is equal to or less than a threshold, performing the transmission switching operation while the rotational speed is equal to or less than the threshold, and performing the transmission switching operation is completed, a second rotation speed control is performed to increase the rotation speed of the drive source so that the rotation speed becomes higher than the threshold value, and the time from the completion of the first rotation speed control to the start of the transmission switching operation and a second interval time that is the time from the completion of the transmission switching operation to the start of the second rotation speed control,
The second interval time is longer than the first interval time.

According to the present invention, when the rotational speed of the driving source is equal to or less than the preset threshold value, the clutch operation unit immediately switches the work clutch to the transmission state. The quickness of operation of the work clutch is ensured. Further, when the rotation speed of the drive source is higher than the threshold, the clutch operation unit switches the work clutch to the transmission state after the rotation speed of the drive source is lowered to the threshold or less, so that the transmission belt slips. is strongly reduced. In other words, according to the present invention, since the timing of switching operation of the work clutch is adjusted according to the rotation speed of the drive source, a work vehicle that achieves both protection of the transmission belt and comfortable operation of the operator is realized. be done. Also, immediately after the transmission belt is switched to the working state, it is conceivable that the transmission belt may slip or vibrate. For this reason, it is desirable to secure time for stably breaking in the transmission belt from the completion of the transmission switching operation to the start of the second rotation speed control. On the other hand, from the viewpoint of operability of the work clutch, it is desirable that the switching operation by the clutch operation unit be performed as quickly as possible. With this configuration, since the second interval time is longer than the first interval time, it is possible to sufficiently break in the transmission belt while the second interval time elapses. As a result, while the transmission belt is protected, the work clutch can be switched to the transmission state as quickly as possible without giving the operator the discomfort of waiting.

A work vehicle according to the present invention includes a drive source capable of rotating, a work device driven by the drive source, a transmission belt capable of transmitting power from the drive source to the work device, and transmitting power to the transmission belt. a belt tension type work clutch that can be switched between a transmission state in which power is transmitted to the transmission belt and a non-transmission state in which power is not transmitted to the transmission belt; an on control signal that is a control signal relating to an on operation of the work clutch; a clutch operation unit capable of switching the work clutch between the transmission state and the non-transmission state based on the control signal that is the control signal relating to the disengagement operation; and a rotation capable of detecting the number of revolutions of the drive source. and a number detection sensor, wherein when the clutch operation unit detects the on control signal and the rotational speed is equal to or less than a preset threshold value, the clutch operation unit detects that the work in the non-transmission state is stopped. If the transmission switching operation for putting the clutch in the transmission state is immediately performed and the rotational speed is higher than the threshold value when the clutch operating unit detects the on control signal, the clutch operating unit detects that the rotational speed is the A first rotation speed control is performed to reduce the rotation speed of the drive source so that the rotation speed of the drive source is reduced to a threshold value or less, and the transmission switching operation is performed in a state where the rotation speed is the threshold value or less, and a notification regarding the transmission switching operation is performed. A notification unit is provided, and the notification unit is provided at a time point when the clutch operation unit detects the on control signal and a time point when a preset time has elapsed from the start of the transmission switching operation. The transmission switching operation is continuously notified .

According to the present invention, when the rotational speed of the driving source is equal to or less than the preset threshold value, the clutch operation unit immediately switches the work clutch to the transmission state. The quickness of operation of the work clutch is ensured. Further, when the rotation speed of the drive source is higher than the threshold, the clutch operation unit switches the work clutch to the transmission state after the rotation speed of the drive source is lowered to the threshold or less, so that the transmission belt slips. is strongly reduced. In other words, according to the present invention, since the timing of switching operation of the work clutch is adjusted according to the rotation speed of the drive source, a work vehicle that achieves both protection of the transmission belt and comfortable operation of the operator is realized. be done. Further, with this configuration, the state in which the clutch operation unit is switching the work clutch to the transmission state is notified to the operator by the notification unit, so that the operator can be notified that the clutch operation unit is in the switching operation. recognizable. As a result, even if the work clutch is not immediately switched to the transmission state when the clutch operation unit detects the on control signal, it is possible to prevent the operator from misunderstanding that it is out of order.

In the present invention, it is preferable that the set time is set before the transmission switching operation is completed, and the notification unit stops the notification when the set time has passed.

When the clutch operation unit detects the ON control signal, the notification section notifies the operator of the switching operation state of the clutch operation unit. Therefore, with the configuration in which the notification is stopped before the transmission switching operation is completed, the notification by the notification unit does not become persistent, and the risk of the notification becoming unpleasant to the operator is reduced.

It is a side view which shows the combine as a working vehicle. It is a top view which shows the combine as a working vehicle. It is a transmission system diagram which shows the power transmission of a combine. FIG. 4 is a functional block diagram showing a switching operation of a clutch operation unit and a data flow; FIG. 4 is a flow chart showing clutch switching control; FIG. 4 is a flow chart showing clutch switching control; FIG. 4 is a time chart diagram showing switching control of a clutch; FIG. 4 is a time chart diagram showing switching control of a clutch; FIG. 4 is a time chart diagram showing switching control of a clutch;

〔overall structure〕
DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where an embodiment of a work vehicle according to the present invention is applied to a normal combine harvester shown in FIGS. 1 and 2 will be described below with reference to the drawings. 1 and 2 show a common combine harvester for harvesting crops such as rice, wheat, and soybeans. In this embodiment, when defining the longitudinal direction of the traveling machine body of the combine, it is defined along the traveling direction of the machine body in the working state. Define 1 and 2 is the front side of the fuselage, and the direction indicated by the code (B) in FIGS. 1 and 2 is the rear side of the fuselage. The direction indicated by the symbol (L) in FIG. 2 is the left side of the fuselage, and the direction indicated by the symbol (R) in FIG. 2 is the right side of the fuselage. Therefore, the lateral direction of the machine body corresponds to the lateral width direction of the traveling machine body.

A pair of left and right crawler traveling devices 2 are provided at the lower part of the machine body frame 1 of the traveling machine body.
A harvesting unit 3 as a working device is provided in front of the traveling machine body, and the harvesting unit 3 harvests crops to be harvested and conveys them backward. A threshing device 4, a grain tank 5, a grain discharging device 6, and the like are provided on the body frame 1 as working devices of the present invention. The threshing device 4 treats the reaping grain culms conveyed from the harvesting unit 3 and sorts the threshed material obtained by the treatment into grains and discharge. The grain tank 5 stores grains obtained by the threshing device 4 . The grain discharging device 6 discharges grains stored in the grain tank 5 to the outside of the machine. The combine harvester is configured as a whole stalk input type that cuts and reaps planted stalks at the base of the planted stalks and inputs all of the harvested stalks into the threshing device 4 .

A driving section 7 is provided on the body frame 1, and the driving section 7 is an area with a cabin in which a driver gets on and performs driving operations. The driving section 7 is located on the right side of the front part of the machine body, and the grain tank 5 is located behind the driving section 7 . Furthermore, the threshing device 4 is positioned on the left side and the grain tank 5 is positioned on the right side, and the threshing device 4 and the grain tank 5 are arranged in the horizontal direction. An engine 8 as a drive source capable of rotationally driving is provided below the operating section 7 . The threshing device 4 has a threshing cylinder 9 that is rotationally driven around an axis extending in the front-rear direction of the machine body. is configured to

A harvesting part 3 is provided with a reaping part 10 and a feeder 11 arranged side by side in the front-rear direction. The reaping part 10 is provided in the front part of the harvesting part 3, reaps planted grain culms to be harvested, and laterally feeds and merges the cut reaping grain culms into the machine width middle part. The feeder 11 is connected to the rear part of the reaping unit 10, and feeds all the reaping grain stalks that are reaped by the reaping unit 10 and gathered in the middle part of the body width of the reaping unit 10 toward the threshing device 4. do. The harvesting section 3 including the reaping section 10 and the feeder 11 moves between a raised position and a raised position around the horizontal axis P1 by extending and contracting a hydraulic cylinder 12 for elevating and extending across the body frame 1 and the feeder 11 . It is supported so that it can swing vertically between the lowered position.

The reaping part 10 is supported by a reaping frame 13 formed by connecting a square pipe, an angle member having an L-shaped cross section, or the like. The reaping unit 10 is provided with a pair of left and right dividers 14 , 14 , a rake reel 15 , a reaping blade 16 and a lateral feed auger 17 . A pair of left and right dividers 14, 14 are provided at the foremost end of the traveling machine body and separate the planted culms to be harvested from the planted culms not to be harvested. The raking reel 15 is positioned behind and above the divider 14 and rakes the planted culms to be harvested rearward. The cutting blade 16 is positioned behind the divider 14 and cuts the base side of the planted grain culm to be harvested rearwardly picked up by the picking reel 15, and is configured, for example, in the shape of a clipper. there is The lateral feeding auger 17 is positioned between the cutting blade 16 and the feeder 11, and laterally feeds the harvested grain culms cut by the cutting blade 16 to the middle side in the left-right direction to collect them and direct them toward the rearward feeder 11. and send it out.

[Transmission structure]
A description of the transmission structure for transmitting the power of the engine 8 to the threshing device 4, the harvesting unit 3 and the like is given below. FIG. 3 is a system diagram of a transmission mechanism that transmits the driving force of the engine 8 to the crawler traveling device 2, the harvesting section 3, the threshing device 4, and the grain discharging device 6, respectively. An engine 8 is provided with an output shaft 8a. The output shaft 8a protrudes from the main body of the engine 8 to the left and right sides of the fuselage. A first transmission belt 23 is wound around the pulleys of the output shaft 8a and the winch drive shaft 21, and a second transmission belt 24 is wound around the pulleys of the output shaft 8a and the travel transmission shaft 22. It is Thus, the output shaft 8a is configured to be capable of belt-driving the winnow drive shaft 21 and the travel transmission shaft 22, respectively.

A belt tension type threshing clutch 23A is provided on the first transmission belt 23, and when the threshing clutch 23A applies tension to the first transmission belt 23, the first transmission belt 23 is configured to transmit power. The threshing clutch 23A corresponds to the "work clutch" of the present invention.

The power transmitted to the travel transmission shaft 22 is transmitted to the travel drive device A. As shown in FIG. Although detailed description is omitted, the traveling drive device A is provided in the lower part of the front part of the machine body, and has a hydrostatic continuously variable transmission and a transmission. In addition, the traveling drive device A drives the left and right crawler traveling devices 2, 2 at a speed suitable for the driving operation, based on the driving operation of a speed change operation tool (not shown), a turning operation tool, etc. provided in the driving unit 7. is configured as The traveling drive device A drives the left and right crawler traveling devices 2, 2 at a constant speed or approximately the same speed when traveling straight, and so as to provide a speed difference between the left and right crawler traveling devices 2, 2 when turning.

The transmission power of the winnow driving shaft 21 is transmitted to the first item collecting section 28 and the second item collecting section 29 through the sorting transmission belt 25 . Further, the transmission power of the winnow drive shaft 21 is transmitted to the threshing relay shaft 37 via the threshing transmission belt 30 . A winnow drive shaft 21 is provided with a winnow 33, and the winnow 33 rotates about the winnow drive shaft 21 as an axis.

A sorting power transmission belt 25 is wound over the winnow drive shaft 21, the relay shaft 26, the first product recovery unit 28, and the second product recovery unit 29, and the first product recovery unit 28 and the second product recovery unit 29 are wound. The recovery unit 29 is integrally belt-driven via the sorting transmission belt 25 . A sorting power transmission belt 27 is wound around the relay shaft 26 and the oscillating sorting device 32 , and the transmission power of the winnow drive shaft 21 is transmitted through the sorting power transmission belt 25 , the relay shaft 26 and the sorting power transmission belt 27 . It is transmitted to the swing sorting device 32 .

A threshing transmission belt 30 is wound over the winnow driving shaft 21 and the threshing relay shaft 37 . A bevel gear 43a is provided at the end of the threshing relay shaft 37 opposite to the side on which the threshing transmission belt 30 is wound, and the bevel gear 43a engages with the bevel gear 43c of the threshing cylinder shaft 9A. The handling cylinder shaft 9A is the rotation axis of the handling cylinder 9 and extends in the front-rear direction, and a bevel gear 43c is provided at the front end of the handling cylinder shaft 9A. In addition, a counter shaft 39 is provided on the opposite side of the threshing relay shaft 37 across the threshing drum shaft 9A in the left-right direction. A bevel gear 43b is provided on the left end portion of the counter shaft 39, and the bevel gear 43b engages with the bevel gear 43c. The threshing relay shaft 37 and the counter shaft 39 are arranged on the same axis in the lateral direction of the machine body, and as the threshing relay shaft 37 rotates, rotational power is applied to the threshing relay shaft 37 via bevel gears 43a, 43b, and 43c. are transmitted to the threshing cylinder shaft 9A and the counter shaft 39, respectively. The counter shaft 39 rotates in a direction opposite to the direction of rotation of the relay shaft 37 for threshing. The threshing relay shaft 37, the threshing cylinder shaft 9A and the counter shaft 39 are each covered with a shaft case 36. As shown in FIG. The left end of the relay shaft for threshing 37 protrudes to the left of the machine body from the shaft case 36 , and the right end of the counter shaft 39 protrudes to the right of the machine from the shaft case 36 .

The transmission power of the relay shaft 37 for threshing can be transmitted to the input shaft 42 for reaping through the transmission belt 40 for reaping. The reaping transmission belt 40 is provided so as to extend forward from the threshing relay shaft 37 . Further, the counter shaft 39 is configured to be able to transmit to the reaping input shaft 42 via the reaping transmission belt 41 . The reaping transmission belt 41 is located on the opposite side of the reaping transmission belt 40 across the feeder 11 in the left-right direction.

The reaping input shaft 42 functions as a drive shaft for the feeder 11 and is provided in a state of protruding leftward and outward from the transport case of the feeder 11 . Reaping transmission belts 40 and 41 are wound around the left and right ends of the reaping input shaft 42, respectively. A sprocket is attached to the reaping input shaft 42 inside the feeder 11, and the reaping input shaft 42 and the feeder transport chain 11A are integrally rotated through the sprocket.

A belt tension type reaping clutch 40A is provided on the reaping transmission belt 40, and the reaping transmission belt 40 is configured to transmit power by applying tension to the reaping transmission belt 40A. A belt tension type reaping clutch 41A is provided on the reaping transmission belt 41, and the reaping transmission belt 41 is configured to transmit power by applying tension to the reaping transmission belt 41 by the reaping clutch 41A. The reaping clutches 40A and 41A do not apply tension to the reaping transmission belts 40 and 41 at the same time. is configured to apply tension to the When the reaping clutch 40A applies tension to the reaping transmission belt 40, the reaping part 10 and the feeder 11 rotate so as to convey the reaping grain culms to the rear of the machine body. When the reaping clutch 41A applies tension to the reaping power transmission belt 41, the reaping part 10 and the feeder 11 are reversed.

The transmission power of the reaping input shaft 42 is transmitted to the reaping relay shaft 45 by a reaping transmission belt 44 extending in the front-rear direction along the outer side of the right side of the feeder 11 . The transmission power of the cutting relay shaft 45 is transmitted to the lateral feeding auger 17 via the chain 46 and to the cutting blade 16 via the reciprocating rotating rod 47 . The reciprocating rotating rod 47 is configured to allow the cutting blade 16 to reciprocate by reciprocating at a predetermined angle. Further, the transmission power of the reaping relay shaft 45 is transmitted to the raking reel 15 via the chains 46 and 48 and the belt 49 .

A pulley around which the discharge transmission belt 50 is wound is provided at the end of the output shaft 8a opposite to the side on which the first transmission belt 23 and the second transmission belt 24 are located. The discharge transmission belt 50 is wound over the . The discharge transmission belt 50 is provided with a belt tension type discharge clutch 50A, and the discharge clutch 50A applies tension to the discharge transmission belt 50 so that the discharge transmission belt 50 can transmit the power of the engine 8 to the discharge input shaft 51. It is configured. When the discharge clutch 50A applies tension to the discharge transmission belt 50, the discharge screw 6A inside the grain discharge device 6 rotates via the discharge input shaft 51, and the grains stored in the grain tank 5 are discharged to the grain discharge device. 6 to be discharged out of the machine. Thus, the working device of the present invention is driven by the engine 8 as a drive source.

[About the clutch]
As explained with reference to FIG. 3, the threshing clutch 23A, the reaping clutches 40A and 41A, and the discharge clutch 50A are provided as clutches capable of transmitting power to the transmission belt. These clutches intervene in the power transmission system described above. The threshing clutch 23A is arranged adjacent to the first transmission belt 23 . The reaping clutch 40A is arranged adjacent to the reaping transmission belt 40, and the reaping clutch 41A is arranged adjacent to the reaping transmission belt 41. As shown in FIG. The discharge clutch 50A is arranged adjacent to the discharge transmission belt 50. As shown in FIG. Each of these clutches is a belt tensioner engageable with a respective adjacent transmission belt and is configured to be switchable between transmission and non-transmission states. In this embodiment, the "transmission state" means a state in which the clutch transmits power to the adjacent transmission belts, and the "non-transmission state" means that the clutch transmits power to the adjacent transmission belts. means a state in which the These clutches are configured to be operable by a first clutch operating unit 52A and a second clutch operating unit 52B as shown in FIG.

Although not shown, the threshing clutch 23A and the first clutch operation unit 52A are linked by an operation wire. 52 A of 1st clutch operation units are comprised by pulling this operation wire so that switching operation of the threshing clutch 23A to a transmission state is possible. Although not shown, the threshing clutch 23A is provided with a spring, and the threshing clutch 23A is urged in the direction away from the first transmission belt 23 . Therefore, if the first clutch operation unit 52A does not pull the operation wire of the threshing clutch 23A, the threshing clutch 23A is held in the non-transmitting state.

Although not shown, the reaping clutch 40A and the second clutch operation unit 52B are linked by an operation wire. The second clutch operation unit 52B is configured to be able to switch the reaping clutch 40A to the transmission state by pulling the operation wire. The reaping clutch 41A and the second clutch operation unit 52B are linked by an operation wire. The second clutch operation unit 52B is configured to be able to switch the reaping clutch 41A to the transmission state by pulling the operation wire. The discharge clutch 50A and the second clutch operating unit 52B are linked by an operating wire, and the second clutch operating unit 52B is configured to switch the discharging clutch 50A to the transmission state by pulling the operating wire. The second clutch operating unit 52B is configured to be capable of switching (independently) each of the reaping clutches 40A, 41A and the discharge clutch 50A between a transmission state and a non-transmission state.

Although not shown, each of the threshing clutch 23A, the reaping clutches 40A and 41A, and the discharge clutch 50A is provided with a spring, and each of these clutches is biased away from the respective adjacent belts. there is Therefore, unless the second clutch operating unit 52B pulls the operating wires of the reaping clutches 40A, 41A and the discharge clutch 50A, the reaping clutches 40A, 41A and the discharge clutch 50A are not operated. It is held in the transmission state.

[Transmission switching operation by the clutch operation unit]
As shown in FIG. 4, the clutch operating unit 52 has a first clutch operating unit 52A and a second clutch operating unit 52B. The first clutch operation unit 52A and the threshing clutch 23A are linked to each other via an operation wire. Although not shown, the first clutch operation unit 52A has an electric motor, and the operation wire between the first clutch operation unit 52A and the threshing clutch 23A is pulled or loosened by this electric motor.

The second clutch operating unit 52B and the reaping clutch 40A are linked to each other via an operating wire. The second clutch operating unit 52B and the reaping clutch 41A are linked to each other via an operating wire. The second clutch operation unit 52B and the discharge clutch 50A are linked with each other via an operation wire. That is, three operating wires are connected to the second clutch operating unit 52B: an operating wire linked to the reaping clutch 40A, an operating wire linked to the reaping clutch 41A, and an operating wire linked to the discharging clutch 50A. . Although not shown, the second clutch operating unit 52B has an electric motor, and these three operating wires are pulled or loosened by this electric motor.

The second clutch operation unit 52B is configured such that these three operation wires are individually pulled or loosened in accordance with the operation of the electric motor of the second clutch operation unit 52B. For example, between each of these three operation wires and the electric motor, three cam mechanisms are interposed corresponding to each of the three operation wires, and each of these three cam mechanisms is connected to each of the three operation wires. are formed in different shapes corresponding to the . These three operation wires are individually pulled or loosened by rotating the respective cam mechanisms in accordance with the operation of the electric motor. It should be noted that these three operation wires may be pulled or loosened at the same time in accordance with the operation of the electric motor of the second clutch operation unit 52B.

The clutch operation unit 52 has an ECU (Electronic Control Unit), memory (for example, DRAM or EEPROM), a relay circuit, various input/output devices, etc., in addition to the first clutch operation unit 52A and the second clutch operation unit 52B. That is, the clutch operation unit 52 is also configured as an electronic control unit, and the electric motors of the first clutch operation unit 52A and the second clutch operation unit 52B are controlled by this electronic control unit.

The operation switch 54 is arranged at an arbitrary position in the operation section 7 (see FIG. 1) and is configured to be operable by a passenger on board the operation section 7 . A control signal of the operation switch 54 is input to the clutch operation unit 52, and the clutch operation unit 52 operates the electric motor of the first clutch operation unit 52A and the electric motor of the second clutch operation unit 52B based on the control signal of the operation switch 54. Control. That is, the electric motors of the first clutch operation unit 52A and the second clutch operation unit 52B are configured to be operable based on the control signal of the operation switch 54, and the respective operation wires are pulled or loosened. or

The control signal has an on control signal and an off control signal. In other words, the clutch operation unit 52 is configured to be able to detect an on control signal and an off control signal from the operation switch 54 . The on control signal is a control signal relating to the on operation of the clutch. When the electric motor is controlled to pull the operating wire based on the on control signal, the clutch is switched from the non-transmitting state to the transmitting state. The disengagement control signal is a control signal relating to the disengagement operation of the clutch. When the electric motor is rotationally controlled to loosen the operation wire based on the disengagement control signal, the clutch is switched from the transmission state to the non-transmission state.

In this way, the first clutch operation unit 52A is based on the on control signal, which is a control signal for the on operation of the threshing clutch 23A, and the off control signal, which is a control signal for the off operation of the threshing clutch 23A. can be switched between a transmission state and a non-transmission state. The second clutch operation unit 52B also provides an on control signal, which is a control signal relating to the on operation of each of the reaping clutches 40A, 41A and the discharge clutch 50A, and a disengagement control signal, which is a control signal relating to the disengagement operation of these clutches. Each of these clutches can be switched between a transmitting state and a non-transmitting state based on a signal. In other words, the clutch operation unit 52 switches the clutch between the transmission state and the non-transmission state based on an on control signal, which is a control signal for the clutch on operation, and a disengagement control signal, which is a control signal for the clutch disengagement operation. It is configured to be switchable.

As described above with reference to FIG. 3, the power transmission belts shown in FIG. The rotation speed of the engine 8 as a drive source is hereinafter referred to as "engine rotation speed R".
The engine speed R includes the meaning of "target speed for the engine 8". Also, the engine speed R may include the meaning of "the actual number of revolutions of the engine 8".

When the belt tension type clutch is switched from the non-transmitting state to the transmitting state while the engine speed R is high, the transmission belt adjacent to the clutch suddenly starts rotating at high speed. In this case, a sudden load is applied to the transmission belt, which may cause shock, vibration, slippage, and the like, shortening the life of the transmission belt. In particular, since the first transmission belt 23 transmits power to working devices including the harvesting unit 3 and the threshing device 4, a large load is likely to be applied to the first transmission belt 23. Therefore, when the clutch is switched from the non-transmission state to the transmission state, it is desirable that the engine speed R is low. Therefore, the clutch operation unit 52 in this embodiment is configured to be able to adjust the engine speed R when switching the clutch from the non-transmitting state to the transmitting state. The operation of the clutch operation unit 52 to switch the clutch from the non-transmitting state to the transmitting state is hereinafter referred to as "transmission switching operation".

The clutch operation unit 52 is configured to be able to input a set rotation speed from the accelerator operation tool 53 and is configured to be able to input the actual rotation speed of the engine 8 from the rotation speed detection sensor 55 . The accelerator operation tool 53 is, for example, a dial-type or lever-type operation tool, and is configured to be able to set the target rotation speed of the engine 8 based on the amount of operation of the accelerator operation tool 53 . The rotation speed detection sensor 55 is, for example, a rotation detector attached to the engine 8 .

The clutch operation unit 52 is configured to be able to output an instruction signal to the engine control unit 56 based on the operation amount of the accelerator operation tool 53 . The engine control unit 56 is configured to be capable of various controls over the engine 8 , and the engine control unit 56 adjusts the actual rotation speed of the engine 8 based on the instruction signal from the clutch operation unit 52 . The actual rotation speed of the engine 8 is detected by a rotation speed detection sensor 55, and the detected rotation speed is transmitted as a detection signal from the rotation speed detection sensor 55 to the clutch operation unit 52 periodically (for example, every 0.1 seconds). .

The clutch operation unit 52 is configured to be capable of outputting a notification signal to the notification section 57, and the notification signal is output from the clutch operation unit 52 to the notification section 57 when the transmission switching operation by the clutch is performed by the clutch operation unit 52. The notification unit 57 is, for example, a monitor, a buzzer, a display lamp, or the like arranged in the operation unit 7, and is configured to be able to notify the transmission switching operation. A passenger in the driving unit 7 can recognize the state in which the clutch is switched from the non-transmission state to the transmission state by the notification from the notification unit 57 . Note that the notification unit 57 may be configured to be incorporated in a terminal (for example, a smart phone or a portable computer) carried by a passenger of the operation unit 7 or a worker working in a field.

The switching control of the clutch by the clutch operation unit 52 will be described with reference to FIGS. 4 to 6. FIG. 5 and 6 show a flow chart of control when the first clutch operation unit 52A switches the threshing clutch 23A from the non-transmitting state to the transmitting state. "Start" in FIG. 5 is the timing at which the clutch operation unit 52 detects the on control signal. From this timing, clutch switching control is started, and first, notification processing is started (step #01). The notification process is a process in which the clutch operation unit 52 outputs a notification signal to the notification section 57, and the start of clutch switching control is notified to the passenger of the driving section 7 via the notification section 57. FIG. This notification process continues until the clutch switching control process reaches step #17, which will be described later.

After starting the notification process, it is determined whether or not the engine speed R is higher than a preset threshold value RL (step #02). The threshold RL is pre-stored in the memory of the clutch operation unit 52, for example. Then, the engine speed R and the threshold value RL are compared. Note that the threshold RL may have any hysteresis width, and the hysteresis width stabilizes the determination based on the comparison between the engine speed R and the threshold RL. If the engine speed R is equal to or less than the threshold value RL (or less than the threshold value RL) (step #02: No), the clutch switching control proceeds to step #11, which will be described later.

When the engine speed R is higher than the threshold value RL (step #02: Yes), the speed control flag FL is set to ON (step #03). The rotation speed control flag FL is a variable used in the processing of the ECU of the clutch operation unit 52, and is used in the second rotation speed control described later. After the rotational speed control flag FL is set to ON, the first rotational speed control is performed (step #04). The "first speed control" is control to lower the engine speed R so that the engine speed R is equal to or lower than the threshold RL (or less than the threshold RL). In the first rotation speed control, an instruction signal to decrease the engine rotation speed R is transmitted from the clutch operation unit 52 to the engine control unit 56, and the engine control unit 56 determines that the actual rotation speed of the engine 8 is equal to or lower than the threshold RL (or the threshold RL less than). The engine speed R changes with time, and the determination of whether the engine speed R is higher than the threshold value RL is periodically repeated (step #05). When the engine speed R is equal to or less than the threshold RL (or less than the threshold RL) (step #05: No), the first speed control of the engine speed R is terminated, and the clutch switching control proceeds to step #11, which will be described later. move on.

At step #11, it is determined whether or not the rotation speed control flag FL is set to ON. If it is determined that the rotation speed control flag FL is ON (step #11: Yes), it is just after the first rotation speed control is performed at this timing, so the torque of the engine 8 may be unstable. Conceivable. In this state, for example, if the threshing clutch 23A is operated to switch transmission, the output of the engine 8 may become unstable at this timing. In order to avoid such inconvenience, the waiting process shown in steps #12 to #14 is executed. If the rotational speed control flag FL is OFF (step #11: No), the clutch switching control proceeds to step #15, which will be described later.

At step #12, the first waiting timer Tw1 starts counting, and the determination at step #13 is repeated until the first waiting timer Tw1 counts up. The first waiting timer Tw1 is a timer variable used in the processing of the ECU of the clutch operation unit 52. FIG. The time from when the first waiting timer Tw1 starts counting in step #12 to when the first waiting timer Tw1 counts up in step #13 is referred to as "first interval time". The first interval time is the time from the completion of the first rotation speed control to the start of the transmission switching operation, and after the first rotation speed control is performed, the change in the actual rotation speed of the engine 8 converges. It is set as a waiting time for the torque of the engine 8 to stabilize. Also, the first interval time is a value that is stored in the memory of the clutch operation unit 52 and can be changed as appropriate. Of course, the first interval time may be zero, in which case the first waiting timer Tw1 immediately counts up (step #13: Yes) and no waiting time occurs. When the first waiting timer Tw1 counts up (step #13: Yes), the counting state of the first waiting timer Tw1 is cleared (step #14).

At step #15, the notification timer Tn starts counting. The notification timer Tn is a timer variable used in the processing of the ECU of the clutch operation unit 52, and is used to set the end timing of the notification processing started at step #01. After the notification timer Tn starts counting, the transmission switching operation for the threshing clutch 23A is started (step #16). In addition, the start of counting of the notification timer Tn in step #15 and the start of the transmission switching operation for the threshing clutch 23A in step #16 may be performed simultaneously.

In this embodiment, the notification process by the notification unit 57 ends before the transmission switching operation for the threshing clutch 23A is completed. Therefore, it is determined whether or not the notification timer Tn has counted up after the transmission switching operation for the threshing clutch 23A is started (step #17). The count-up time of the notification timer Tn is set to a time shorter than the time required for the transmission switching operation to the threshing clutch 23A. Also, the count-up time of the notification timer Tn is a value that is stored in the memory of the clutch operation unit 52 and can be changed as appropriate.

When the notification timer Tn counts up (step #17: Yes), the notification processing by the notification unit 57 is terminated (step #18), and the counting state of the notification timer Tn is cleared (step #19). Then, it is determined whether or not the transmission switching operation for the threshing clutch 23A is completed (step #20), and the processing of steps #17 to #20 is repeated until the transmission switching operation for the threshing clutch 23A is completed. During this time, the operation wire across the threshing clutch 23A and the first clutch operation unit 52A is pulled by the operation of the electric motor of the first clutch operation unit 52A, and the threshing clutch 23A is switched from the non-transmission state to the transmission state. In addition, when the processing of step #17 to step #20 is repeated after the determination of Yes is made in step #17 and the processing of step #18 and step #19 is performed, the notification timer Tn is in the counting state. Therefore, step #17 always results in a No determination. Further, although not shown in the flowchart, when the transmission switching operation is completed (step #20: Yes) and the notification timer Tn is counting, the notification processing by the notification unit 57 is terminated and the notification timer Tn is stopped. The count state is cleared.

When the transmission switching operation for the threshing clutch 23A is completed (step #20: Yes), it is determined whether or not the rotation speed control flag FL is set to ON (step #21). If the rotational speed control flag FL is OFF (step #21: No), the clutch switching control ends. When the rotation speed control flag FL is ON (step #21: Yes), the second rotation speed control is performed in the processing of steps #23 to #27. "Second speed control" means that when the transmission switching operation is completed in a state where the first speed control is performed and the engine speed R is equal to or lower than the threshold value RL (or less than the threshold value RL), the engine speed R This control is to increase the engine speed R so that it becomes higher than the threshold RL. The engine speed R is restored by this second speed control.

After the rotation speed control flag FL is cleared in step #22, the second waiting timer Tw2 starts counting (step #23), and the determination in step #24 is repeated until the second waiting timer Tw2 counts up. The second waiting timer Tw2 is a timer variable used in the processing of the ECU of the clutch operation unit 52. The time from when the second waiting timer Tw2 starts counting in step #23 to when the second waiting timer Tw2 counts up in step #24 is referred to as "second interval time". The second interval time is the time from the completion of the transmission switching operation to the start of the second rotation speed control, and the impact and vibration applied to the first transmission belt 23 converge and the rotational state of the first transmission belt 23 stabilizes. It is set as the waiting time for Also, the second interval time is a value that is stored in the memory of the clutch operation unit 52 and can be changed as appropriate. Of course, the second interval time may be zero, in which case the second waiting timer Tw2 immediately counts up (step #24: Yes) and no waiting time occurs. When the second waiting timer Tw2 counts up (step #24: Yes), the counting state of the second waiting timer Tw2 is cleared (step #25).

Note that the counts of the first waiting timer Tw1, the second waiting timer Tw2, and the notification timer Tn may be configured to be incremented from zero to the value of the count-up time. Further, the counts of the first waiting timer Tw1, the second waiting timer Tw2, and the notification timer Tn may be decremented from the value of the count-up time to zero. The count-up time in each of the first waiting timer Tw1, the second waiting timer Tw2, and the notification timer Tn is set separately.

The second rotation speed control is started in step #26, and the determination of step #27 is repeated until it is determined that the second rotation speed control is completed. During this time, the engine speed R changes with time, and the engine speed R and the set speed of the accelerator operation tool 53 are periodically compared. In the second rotation speed control, an instruction signal to increase the engine rotation speed R is transmitted from the clutch operation unit 52 to the engine control unit 56 , and the engine control unit 56 controls the actual rotation speed of the engine 8 to the set rotation speed of the accelerator operation tool 53 . Control the engine 8 to reach the number. When the engine rotation speed R reaches the set rotation speed of the accelerator operating tool 53, it is determined that the second rotation speed control is completed (step #27: Yes), and the clutch switching control ends.

7 to 9 are time charts of the engine speed R, the state of the threshing clutch 23A (see FIG. 4, etc., the same applies hereinafter), and the notification process by the notification unit 57 (see FIG. 4, the same applies hereinafter). is shown over time as . In FIGS. 7 to 9, the non-transmitting state and transmitting state of the threshing clutch 23A are indicated by horizontal lines, respectively, and the state of the threshing clutch 23A during transmission switching operation is indicated by an inclined line. ing.

FIG. 7 shows how the transmission switching operation is performed by the clutch operation unit 52 (see FIG. 4, the same applies hereinafter) when the engine speed R is always equal to or lower than the threshold value RL.
In the example shown in FIG. 7, a determination of No is made in step #02 based on the flowchart shown in FIG. Since the rotational speed control flag FL is not set to ON, a determination of No is made in step #11, and a determination of No is also made in step #21. Therefore, the process of step #01, the process of step #15, and the process of step #16 are performed substantially simultaneously. For this reason, the timing at which the transmission switching operation to the threshing clutch 23A is started and the timing at which the notification process by the notification unit 57 is started are substantially simultaneous.

In FIG. 7, the timing at which the threshing clutch 23A begins to shift from the non-transmission state to the transmission state is the detection timing of the ON control signal. The processing of step #01 shown in FIG. 5 and the processing of steps #15 and #16 shown in FIG. 6 are performed substantially simultaneously at the detection timing of the on control signal. In this way, when the clutch operation unit 52 detects the ON control signal and the engine speed R is equal to or lower than the preset threshold value RL (or lower than the threshold value RL), the clutch operation unit 52 detects the threshing clutch 23A. Immediately perform the transmission switching operation for

FIG. 8 shows how the transmission switching operation is performed by the clutch operation unit 52 when the engine speed R is R1, which is higher than the threshold value RL. In this case, the set rotational speed of the accelerator operation tool 53 (see FIG. 4, the same applies hereinafter) is set to R1. FIG. 9 also shows how the transmission switching operation is performed by the clutch operation unit 52 when the engine speed R is R2, which is higher than the threshold value RL. In this case, the set rotation speed of the accelerator operating tool 53 is set to be R2, and R2 is a rotation speed lower than R1.

In any of the examples shown in FIGS. 8 and 9, steps #01 to #04 in FIG. 5 are performed at the timing when the clutch operation unit 52 detects the on control signal. In the example shown in FIG. 8, the first rotation speed control is performed over time Td1, and in the example shown in FIG. 9, the first rotation speed control is performed over time Td2. In this way, when the engine speed R is higher than the threshold RL when the clutch operation unit 52 detects the ON control signal, the clutch operation unit 52 performs the first speed control, and the engine speed R reaches the threshold RL. Transmission switching operation for the threshing clutch 23A is performed in a state of below (or less than the threshold value RL).

In the first rotation speed control shown in FIG. 8, the engine rotation speed R is lowered from R1 to the threshold value RL during time Td1. If the rate of change per unit time of the engine speed R in the first speed control is defined as the first rate of change Rd, the first rate of change Rd is calculated from the following equation in the example shown in FIG.
Rd=(R1-RL)/Td1

Further, in the first rotation speed control shown in FIG. 9, the engine rotation speed R is lowered from R2 to the threshold value RL during time Td2. In the example shown in FIG. 9, the first rate of change Rd described above is calculated from the following equation.
Rd=(R2-RL)/Td2

The first rate of change Rd is represented by the degree of inclination of the graph of the engine speed R in FIGS. The dashed line shown in the graph of the engine speed R in FIG. 9 is superimposed on the solid line shown in the graph of the engine speed R in FIG. As shown in FIG. 9, the degree of inclination (broken line) of the graph of the engine speed R when the engine speed R is lowered from R1 to the threshold RL, and the degree of inclination (dashed line) when the engine speed R is lowered from R2 to the threshold RL. The degree of inclination (solid line) of the graph of the engine speed R is the same. Therefore, the first change rate Rd is constant regardless of the engine speed R at the time when the clutch operation unit 52 detects the ON control signal, as shown in the following formula.
Rd=(R1-RL)/Td1=(R2-RL)/Td2

In any of the examples shown in FIGS. 8 and 9, after the first rotation speed control is completed, the first waiting timer Tw1 is counted based on the processing of steps #12 and #13 shown in FIG. The first interval time is indicated by "Tw1" in FIGS. After the lapse of the first interval time, the transmission switching operation for the threshing clutch 23A is started based on the process of step #16 shown in FIG. After the transmission switching operation is completed, the second waiting timer Tw2 is counted based on the processing of steps #23 and #24, and the second interval time is indicated by "Tw2" in FIGS.

After the second interval time elapses, in both of the examples shown in FIGS. 8 and 9, the second rotational speed control based on the process of step #26 in FIG. 6 is performed. In the example shown in FIG. 8, the second speed control is performed over time Ta1, and in the example shown in FIG. 9, the second speed control is performed over time Ta2.

In the second rotation speed control shown in FIG. 8, the engine rotation speed R is increased from the threshold value RL to R1 during the time Ta1. If the rate of change per unit time of the engine speed R in the second speed control is defined as the second rate of change Ru, the second rate of change Ru is calculated from the following equation in the example shown in FIG.
Ru=(R1−RL)/Ta1

Further, in the second rotation speed control shown in FIG. 9, the engine rotation speed R is raised from the threshold value RL to R2 during the time Ta2. In the example shown in FIG. 9, the above-described second rate of change Ru is calculated from the following equation.
Ru = (R2-RL)/Ta2

The second rate of change Ru is represented by the degree of inclination of the graph of the engine speed R in FIGS. Also, the second rate of change Ru is constant as shown in the following formula.
Ru=(R1-RL)/Ta1=(R2-RL)/Ta2
Note that the second rate of change Ru does not have to be constant, and the second rate of change Ru may change according to the set rotation speed of the accelerator operation tool 53, for example.

In this embodiment, the first rate of change Rd is set smaller than the second rate of change Ru. In other words, the time Td1 is set longer than the time Ta1, and the time Td2 is set longer than the time Ta2. When the crawler traveling device 2 is being driven when the first rotation speed control is executed, the actual rotation speed of the engine 8 may suddenly drop due to the drive load of the crawler traveling device 2 . In such a case, the sudden deceleration of the crawler traveling device 2 may surprise the operator or make him feel uncomfortable. With this configuration, the engine speed R is gradually lowered based on the first rate of change Rd, so the crawler traveling device 2 gradually decelerates without suddenly decelerating. Therefore, the fear that the operator will be surprised or feel uncomfortable during the execution of the first rotation speed control is greatly reduced.

The first interval time is the time to wait for the output of the engine 8 (see FIG. 3, the same shall apply hereinafter) to stabilize immediately after the first rotation speed control, and the second interval time is the second interval time immediately after the transmission switching operation. This is the time to wait until the shock and vibration applied to the transmission belt 23 (see FIG. 4, the same applies hereinafter) converge. As described above, since the engine speed R is gradually lowered in the first speed control, the output of the engine 8 immediately after the first speed control is the impact of the first transmission belt 23 and the It stabilizes faster than waiting for the convergence of oscillations. Therefore, in this embodiment, the first interval time indicated by "Tw1" in FIGS. 8 and 9 is set shorter than the second interval time indicated by "Tw2" in FIGS. In other words, the second interval time indicated by "Tw2" in FIGS. 8 and 9 is set longer than the first interval time indicated by "Tw1" in FIGS. The second interval time is set to 0.7 seconds, for example. The first interval time is set, for example, between 0 and 0.3 seconds, and may have a zero value.

The set time counted by the notification timer Tn is indicated by the interval time of "Tn" in FIGS. 7 to 9, and the notification process is switched from ON to OFF at the timing when the counting of the notification timer Tn ends. The set time counted by the notification timer Tn is a preset set time from the start of the transmission switching operation to the threshing clutch 23A. That is, as shown in FIGS. 7 to 9, the notification unit 57 detects the on control signal at the time when the clutch operation unit 52 detects the ON control signal, at the time when the preset time has elapsed from the start of the transmission switching operation, It continues to inform about the transmission switching operation over the period.

At the timing when the notification process is switched from ON to OFF, the transmission switching operation for the threshing clutch 23A has not been completed. That is, the set time counted by the notification timer Tn is set before the completion of the transmission switching operation. For example, if the time required from the start to the completion of the transmission switching operation is 1.3 seconds, the set time counted by the notification timer Tn is set to 1 second, for example. Then, when the count of the notification timer Tn has passed the set time, the notification unit 57 stops the notification. Therefore, the notification by the notification unit 57 does not have to be persistent, and the possibility that the operator feels uncomfortable with the notification is reduced.

[Another embodiment]
The present invention is not limited to the configurations exemplified in the above-described embodiments, and other representative embodiments of the present invention will be exemplified below.

(1) In the above-described embodiment, the clutch operation unit 52 exemplifies a configuration in which the threshing clutch 23A is operated for transmission switching. Also good. When the reaping clutch 40A is the "work clutch" of the present invention, the "transmission belt" of the present invention is the reaping power transmission belt 40. As shown in FIG. Further, when the reaping clutch 41A is the "work clutch" of the present invention, the "transmission belt" of the present invention is the reaping transmission belt 41. As shown in FIG. In addition, when the discharge clutch 50A is the "work clutch" of the present invention, the "transmission belt" of the present invention is the discharge transmission belt 50.

(2) In the above-described embodiment, when the transmission switching operation is completed in a state where the first rotation speed control is performed and the engine rotation speed R is equal to or lower than the threshold value RL, the clutch operation unit 52 performs the second rotation speed control. is not limited to this embodiment. For example, the clutch operation unit 52 may be configured so that it can be selectively set so as not to perform the second rotation speed control.

(3) In the above-described embodiment, the clutch operation unit 52 performs the second rotation speed control so that the engine rotation speed R reaches the set rotation speed of the accelerator operation tool 53, but is not limited to this embodiment. For example, in step #03 shown in FIG. 6, at the same time when the rotation speed control flag FL is set to ON, the engine rotation speed R at this timing may be stored in the memory of the clutch operation unit 52. . In this case, in the second rotation speed control, the engine control unit 56 controls the engine 8 so that the actual rotation speed of the engine 8 reaches the engine rotation speed R stored in step #03. good. Then, in step #27, when the engine speed R reaches the engine speed R stored in step #03, it is determined that the second speed control is completed, and even if the clutch switching control ends. good.

(4) In the above-described embodiment, in the first rotation speed control, the engine rotation speed R is decreased in proportion to time based on the first rate of change Rd, but the invention is not limited to this embodiment. For example, in the first rotation speed control, the engine rotation speed R may be lowered in an S-shaped curve by control based on a known minimum jerk model or the like. Further, for example, in the second speed control, the engine speed R may be increased in an S-shaped curve by control based on a known minimum jerk model or the like.

(5) In the above-described embodiment, the first interval time, which is the time from the completion of the first rotation speed control to the start of the transmission switching operation, is provided, but the first interval time is not provided. Also good.

(6) In the above-described embodiment, the notification unit 57 notifies the transmission switching operation from the time when the clutch operation unit 52 detects the on control signal to the time before the transmission switching operation is completed. Not limited. For example, the set time counted by the notification timer Tn may be set at the time after the transmission switching operation is completed. Also, the notification unit 57 may be configured to perform some notification even after the notification timer Tn counts up.

(7) In the above-described embodiment, the second interval time is the count time of the second waiting timer Tw2, which is the time from the completion of the transmission switching operation to the start of the second rotation speed control. is not limited to For example, the count time of the second waiting timer Tw2 may be set as the time from the start of the transmission switching operation to the start of the second rotation speed control. In this case, the count time of the second waiting timer Tw2 should be set longer than the time required for the transmission switching operation. Of course, the count time of the second waiting timer Tw2 may be set longer than the count time of the notification timer Tn. In this case, for example, if the time required from the start to the completion of the transmission switching operation is 1.3 seconds, the set time counted by the notification timer Tn is set to 1 second, for example, and the count time of the second waiting timer Tw2. may be set to 2 seconds, for example.

It should be noted that the configurations disclosed in the above-described embodiments (including other embodiments; the same shall apply hereinafter) can be applied in combination with configurations disclosed in other embodiments unless there is a contradiction.
Moreover, the embodiments disclosed in this specification are merely examples, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the scope of the present invention.

The present invention relates to work vehicles. Therefore, the present invention can be applied not only to the above-mentioned ordinary combine harvester, but also to a self-throwing combine harvester, a corn harvester, a tractor equipped with a working device such as a cultivating device, a paddy field working machine, a backhoe, and the like.

3: Harvesting unit (working device)
4: Threshing device (work device)
5: Grain tank (work equipment)
6: Grain discharging device (working device)
8: Engine (driving source)
23: First transmission belt (transmission belt)
23A: Threshing clutch (work clutch)
52: Clutch operation unit 53: Accelerator operation tool 55: Rotation speed detection sensor 57: Informing unit R: Engine speed (rotation speed)
RL: Threshold value Rd: First rate of change Ru: Second rate of change Tn: Notification timer (set time preset from the start of transmission switching operation)
Tw1: First waiting timer (first interval time)
Tw2: Second waiting timer (second interval time)

Claims (6)

a rotatably drivable drive source;
a work device driven by the drive source;
a transmission belt capable of transmitting power from the drive source to the work device;
a belt tension type work clutch capable of switching between a transmission state in which power is transmitted to the transmission belt and a non-transmission state in which power is not transmitted to the transmission belt;
The work clutch is switched to the transmission state and the non-transmission state based on an on control signal, which is a control signal for the on operation of the work clutch, and a disengagement control signal, which is the control signal for the disengagement operation of the work clutch. a clutch operation unit capable of switching operation;
a rotation speed detection sensor capable of detecting the rotation speed of the drive source,
When the clutch operation unit detects the ON control signal and the rotational speed is equal to or less than a preset threshold value, the clutch operation unit switches the transmission state of the work clutch in the non-transmission state to the transmission state. take immediate action and
If the rotational speed is higher than the threshold value when the clutch operation unit detects the on control signal, the clutch operation unit reduces the rotational speed of the driving source so that the rotational speed is equal to or lower than the threshold value. perform the first rotation speed control to lower , perform the transmission switching operation in a state where the rotation speed is equal to or less than the threshold value, and when the transmission switching operation is completed, the rotation speed becomes higher than the threshold value. perform a second rotation speed control for increasing the rotation speed of the drive source so that
A first rate of change that is the rate of change per unit time of the rotational speed in the first rotational speed control, and a second rate of change that is the rate of change per unit time of the rotational speed in the second rotational speed control, is set and
The work vehicle , wherein the first rate of change is smaller than the second rate of change . The work vehicle according to claim 1 , wherein the first rate of change is constant regardless of the rotation speed at the time when the clutch operation unit detects the on control signal. a rotatably drivable drive source;
a work device driven by the drive source;
a transmission belt capable of transmitting power from the drive source to the work device;
a belt tension type work clutch capable of switching between a transmission state in which power is transmitted to the transmission belt and a non-transmission state in which power is not transmitted to the transmission belt;
The work clutch is switched to the transmission state and the non-transmission state based on an on control signal, which is a control signal for the on operation of the work clutch, and a disengagement control signal, which is the control signal for the disengagement operation of the work clutch. a switchable clutch operation unit;
a rotation speed detection sensor capable of detecting the rotation speed of the drive source,
When the clutch operation unit detects the ON control signal and the rotational speed is equal to or less than a preset threshold value, the clutch operation unit switches the transmission state of the work clutch in the non-transmission state to the transmission state. take immediate action and
If the rotational speed is higher than the threshold value when the clutch operation unit detects the on control signal, the clutch operation unit reduces the rotational speed of the driving source so that the rotational speed is equal to or lower than the threshold value. A first rotational speed control to decrease is performed, and the transmission switching operation is performed in a state where the rotational speed is equal to or lower than the threshold value, and when the transmission switching operation is completed, the rotational speed becomes higher than the threshold value. perform a second rotation speed control to increase the rotation speed of the drive source,
A first interval time that is the time from the completion of the first rotation speed control to the start of the transmission switching operation, and a second interval time that is the time from the completion of the transmission switching operation to the start of the second rotation speed control and is set,
The work vehicle, wherein the second interval time is longer than the first interval time. An accelerator operation tool for setting the rotation speed is provided,
The work vehicle according to any one of claims 1 to 3, wherein the clutch operation unit performs the second rotation speed control so that the rotation speed reaches a set rotation speed of the accelerator operation tool. a rotatably drivable drive source;
a work device driven by the drive source;
a transmission belt capable of transmitting power from the drive source to the work device;
a belt tension type work clutch capable of switching between a transmission state in which power is transmitted to the transmission belt and a non-transmission state in which power is not transmitted to the transmission belt;
The work clutch is switched to the transmission state and the non-transmission state based on an on control signal, which is a control signal for the on operation of the work clutch, and a disengagement control signal, which is the control signal for the disengagement operation of the work clutch. a clutch operation unit capable of switching operation;
a rotation speed detection sensor capable of detecting the rotation speed of the drive source,
When the clutch operation unit detects the ON control signal and the rotational speed is equal to or less than a preset threshold value, the clutch operation unit switches the transmission state of the work clutch in the non-transmission state to the transmission state. take immediate action and
If the rotational speed is higher than the threshold value when the clutch operation unit detects the on control signal, the clutch operation unit reduces the rotational speed of the driving source so that the rotational speed is equal to or lower than the threshold value. While performing the first rotational speed control to lower, performing the transmission switching operation in a state where the rotational speed is equal to or less than the threshold value,
A notifying unit capable of notifying about the transmission switching operation is provided,
The notification unit notifies the transmission switching operation at a time when the clutch operation unit detects the on control signal and at a time when a preset time has elapsed from the start of the transmission switching operation. Work vehicle to continue . The set time is set to a point in time before the transmission switching operation is completed,
The work vehicle according to claim 5 , wherein the notification unit stops the notification when the set time has elapsed.

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