JP4476234B2 - Drive control device for work vehicle - Google Patents

Description

  The present invention relates to a traveling device and a working device driven by the output of an engine, an on state for transmitting the output of the engine to the working device, and a cut state for interrupting transmission of the output of the engine to the working device. A working clutch provided with a work clutch that can be switched between a rated rotational state in which the engine is rotated at a set rated rotational speed and an accelerator unit that is switchable between an idle state in which the engine is rotated at an idle rotational speed. The present invention relates to a drive control device.

  When the engine is started, the work clutch is disengaged and the accelerator means is in an idling state, and when the engine is started after the engine is started, the accelerator means is set to a rated rotational state and The work clutch is put into the engaged state. In addition, after starting the engine, there is a case where the vehicle travels without performing work.As such a travel mode, when the low-speed travel is performed with the work clutch disengaged and the accelerator means in the idling state, There are cases where high-speed traveling is performed with the work clutch disengaged and the accelerator means in the rated rotational state.

In such a work vehicle, it is desired to simplify the operation, and as a drive control device for the work vehicle for that purpose, an electric motor that switches the work clutch between the on state and the off state, and commands the work state and the non-work state In order to simplify the operation clutch on / off operation by providing an operation switch and a control means for controlling the operation of the electric motor so as to switch the operation clutch between the on state and the off state according to the command of the operation switch. (For example, see Patent Document 1)
In addition, the said patent document 1 illustrates the combine as a work vehicle, Comprising: As a working device, the threshing device and the reaping processing device which reapers and supplies the threshing device to the threshing device are equipped. As a clutch, a threshing clutch that can be switched between an on state to transmit the engine output to the threshing device and a cut state to block transmission of the engine output to the threshing device, and an on state to transmit the engine output to the reaping processing device And a cut-off clutch that can be switched between a cut-off state that interrupts transmission of the engine output to the cut-off processing device, and an operation switch is provided for handling the pillow in addition to commands for working and non-working states. It is configured to be able to command the state, and when the control means is instructed to work, the threshing clutch and the mowing clutch are turned on and the non-working state is instructed. The threshing clutch and the mowing clutch are turned off, and when the pillow handling state is commanded, the electric motor is controlled so that the threshing clutch is turned on and the mowing clutch is turned off. ing.

JP 2002-95337 A

In the conventional work vehicle drive control device, the operation clutch can be switched between an on state and a disengagement state by a command of the operation switch, so that the operation of the work clutch can be simplified. Since the means must be manually operated separately, the operation becomes troublesome, and improvement has been desired.
That is, for example, when performing work with the engine started, first start the engine with the working clutch disengaged and the idling state of the accelerator means, and then operate the accelerator means to the rated rotational state by manual operation. In order to put the clutch into the engaged state, the operation switch is operated to bring the accelerator means into the rated rotation state and the working clutch into the engaged state. In addition to the operation of the operation switch for turning on the vehicle, the operation of switching the accelerator means to the rated rotation state is required, which makes the operation troublesome.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a drive control device for a work vehicle capable of simplifying operations when working from an engine start state. It is in.

A drive control device for a work vehicle according to the present invention includes a travel device and a work device that are driven by an output of an engine, an on-state that transmits the output of the engine to the work device, and an output of the engine to the work device. A work clutch that can be switched between a cut-off state that interrupts transmission, and an accelerator means that can be switched between a rated rotation state in which the engine is rotated at a set rated rotation speed and an idling state in which the engine is rotated at an idling rotation speed. The first characteristic configuration performs a switching operation between the engaged state and the disengaged state of the work clutch and a switching operation between the rated rotation state and the idling state of the accelerator means. a switching換操action drive means Zhou for commanding work mode instruction irrespective of the operating position of the main shift lever of the speed change operation of the traveling device And manually operable by a mode instruction means, when the work mode instruction is issued by the mode instruction means, and the work clutch to the rated rotational state said accelerator means to said filled condition, the switching And a control means for operating the operation drive means.

That is, when the work mode command is instructed by the mode command means, the control means operates the switching operation drive means to switch the accelerator means to the rated rotation state and the work clutch to the engaged state.
In this way, by commanding the work mode command by the mode command means, the accelerator means can be switched to the rated rotation state and the work clutch to the engaged state. For example, the engine is started to perform the work. When the engine is started when the working clutch is in the disengaged state and the accelerator means is in an idling state, in the engine starting state, the accelerator means is in the rated rotation state and the working clutch is in the engaged state. Mode command means for setting the accelerator means to the rated rotational state and the work clutch to be engaged in order to perform the work in the engine start state, such as being able to be performed by commanding the work mode command by the means. It can be done with a simple operation just by issuing a work mode command. .
Therefore, in order to carry out the work in the engine start state, a work vehicle drive control device capable of simplifying the operation when the accelerator means is in the rated rotation state and the work clutch is in the engaged state has been obtained. .

  In addition to the first feature configuration, the second feature configuration of the present invention is configured such that the mode command means is operable to command a travel mode command, and the control means is configured to perform the travel by the mode command means. When the mode command is instructed, the switching operation driving means is operated so that the accelerator means is in the rated rotation state and the work clutch is in the disengaged state. .

That is, by instructing the driving mode command by the mode command unit, the control unit operates the switching operation driving unit to switch the accelerator unit to the rated rotation state and the work clutch to the disengaged state.
Thus, by commanding the travel mode command by the mode command means, the accelerator means can be switched to the rated rotation state and the work clutch to the disengaged state. For example, the work clutch is in the disengaged state and In the engine starting state where the accelerator means is idling, or in the working state where the work clutch is engaged and the accelerator means is in the rated rotation state, the work clutch is disengaged and the accelerator means is operated in order to run at high speed. The rated rotation state can be achieved by a simple operation instructing the travel mode command by the mode command means.
Therefore, a work vehicle drive control device that can simplify the operation when the work clutch is disengaged and the accelerator means is set to the rated rotation state has been obtained.

  In addition to the first or second feature configuration described above, the third feature configuration of the present invention is configured such that the mode command means is operable to command a travel stop mode command, and the control means includes the mode command When the travel stop mode command is commanded by the means, the switching operation drive means is operated so that the accelerator means is in the idling state and the work clutch is in the disengaged state. It is characterized by.

That is, when the travel stop mode command is commanded by the mode command unit, the control unit operates the switching operation driving unit to switch the accelerator unit to the idling state and the work clutch to the disengaged state.
Thus, by commanding the travel stop mode command by the mode command means, the accelerator means can be switched to the idling state and the work clutch to the disengaged state. For example, the work clutch is in the disengaged state and In a state where the accelerator means travels at a high speed in which the accelerator means is in a rated rotation state, or in a work state where the work clutch is in an engaged state and the accelerator means is in a rated rotation state, the work clutch is disengaged and the accelerator means Is set to the idling state by a simple operation of instructing a travel stop mode command by the mode command means.
Accordingly, the present invention has led to a work vehicle drive control device capable of simplifying the operation when the work clutch is disengaged and the accelerator means is idling.

  According to a fourth feature configuration of the present invention, in addition to any one of the first to third feature configurations, the work device is a threshing device equipped in a combine as a work vehicle, and the work clutch Is a threshing clutch that can be switched between an on state in which the output of the engine is transmitted to the threshing device and a cut state in which transmission of the output of the engine to the threshing device is interrupted.

That is, by commanding the work mode by the mode command means, the control means operates the switching operation drive means to switch the accelerator means to the rated rotation state and the threshing clutch to the engaged state.
In this way, by commanding the work mode by the mode command means, the accelerator means can be switched to the rated rotation state and the threshing clutch can be switched to the on state. When performing the threshing operation, after the engine is started in the idling state of the accelerator means when the threshing clutch is disengaged, the accelerator means is set to the rated rotation state and the threshing clutch is in the engaged state in the engine starting state. The accelerator means is set to the rated rotation state and the threshing clutch is set to the engaged state for the mowing work or the pillow threshing work in the engine starting state, such as being able to be performed by commanding the work mode by the mode command means. Can be performed with simple operations by simply instructing the work mode with the mode command means. To become.
Therefore, there is provided a drive control device for a work vehicle capable of simplifying the operation when the accelerator means is set to the rated rotation state and the threshing clutch is engaged for the mowing work and the pillow threshing work in the engine starting state. I came to get.

According to a fifth feature configuration of the present invention, in addition to any one of the first to third feature configurations described above, the work device reapers a threshing device and a grain pod that are equipped in a combine as a work vehicle. And a cutting state in which the working clutch transmits the output of the engine to the threshing device, and a cutting state that blocks transmission of the engine output to the threshing device. is freely reaper clutch switching switched freely threshing clutch, and, in the disengaged condition for blocking transmission to the cutting apparatus of the output of the engaged condition the engine for transmitting an output of the engine to the cutting processing device Features a point.

That is, by commanding the work mode command by the mode command means, the control means operates the switching operation drive means to switch the accelerator means to the rated rotation state and the threshing clutch and the mowing clutch to the engaged state. .
Thus, by commanding the work mode command by the mode command means, the accelerator means can be switched to the rated rotation state and the threshing clutch and the mowing clutch can be switched to the on state. When the mowing operation is performed, the threshing clutch and the mowing clutch are in the disengaged state and the engine is started in the idling state of the accelerator means. Then, in the engine starting state, the accelerator means is set to the rated rotation state and the threshing clutch and the mowing clutch are operated. The accelerator means is set to the rated rotational state and the threshing clutch is set to the engaged state for the mowing operation in the engine starting state, for example, by making the mode command means command the work mode command. The work mode command is commanded by the mode command means. A done thing by a simple operation of Rudake.
Therefore, the present invention has led to a work vehicle drive control device capable of simplifying the operation when the accelerator means is in the rated rotation state and the threshing clutch is engaged for the mowing operation in the engine starting state. .

  According to a sixth characteristic configuration of the present invention, in addition to the fifth characteristic configuration, when the operation mode command is commanded by the mode command unit, the control unit sets the accelerator unit to a rated rotational state and the threshing clutch. It is characterized by the fact that the switching operation drive means is actuated so that the cutting clutch is in the engaged state and then the reaping clutch is in the engaged state.

That is, by commanding the work mode command by the mode command means, the control means activates the switching operation drive means to switch the accelerator means to the rated rotation state and the threshing clutch to the engaged state, and then the reaping clutch is turned on. It will be switched to the on state.
In this way, by commanding the work mode command by the mode command means, the accelerator means can be switched to the rated rotation state and the threshing clutch can be switched to the engaged state, and then the mowing clutch can be switched to the engaged state. When the cutting operation is performed from the engine start state, the possibility of engine stall can be reduced.
In addition, when the accelerator means is switched to the rated rotation state and the mowing clutch and the threshing clutch are simultaneously switched on, the load applied to the engine and the drive to operate the mowing processing device equipped with a clipper type cutting blade, etc. Since the load applied to the engine is concentrated on the engine in order to operate the threshing device equipped with a handle with a large torque, etc., the engine speed may be reduced and engine stall may occur. When the means is switched to the rated rotation state and the threshing clutch is switched to the on state, and then the reaping clutch is switched to the on state, in other words, when the reaping clutch and the threshing clutch are switched to the on state with the timing shifted, the reaping processing device is The load on the engine to operate and the engine to operate the threshing device To take Loaded in a state of shifting the timing to an engine, can be those less the risk of causing engine stall speed of the engine is reduced.
Therefore, the present invention has led to a work vehicle drive control device that can reduce the risk of engine stall when cutting from the engine start state.

In a seventh feature configuration of the present invention, in addition to any one of the first to third feature configurations described above, the working device reapers a threshing device and a grain pod that are equipped in a combine as a work vehicle. And a cutting state in which the working clutch transmits the output of the engine to the threshing device, and a cutting state that blocks transmission of the engine output to the threshing device. freely threshing clutch switched, and be freely reaper clutch switched between off state to cut off the transmission to the cutting apparatus for the output of the engaged condition and the engine is transmitted to the cutting processing device an output of the engine The mode command means can select and operate a state in which a threshing command is commanded and a state in which a mowing operation command is commanded as a state in which the work mode command is commanded. When the threshing command is commanded by the mode commanding means, the control means sets the accelerator means to the rated rotational state and the threshing clutch is engaged, and the mode commanding means causes the cutting When the work command is commanded, the switching operation driving means is operated so that the mowing clutch and the threshing clutch are put into an engaged state.

That is, when the threshing command is commanded by the mode command means, the control means activates the switching operation driving means to switch the accelerator means to the rated rotation state and the threshing clutch to the engaged state, and the mode command means cuts. By instructing the work command, the control means operates the switching operation drive means to switch the mowing clutch and the threshing clutch to the engaged state.
Thus, by commanding the threshing command by the mode command means, the accelerator means is switched to the rated rotation state and the threshing clutch is switched to the on state, and the cutting command is commanded by the mode command means, the cutting clutch and Since the threshing clutch can be switched to the on state, for example, when the engine is started to run on the headland, the engine is started in the idling state where the cutting clutch and the threshing clutch are in the disengaged state and the accelerator state. After that, in the engine start state, the engine start state such that the accelerator means can be set to the rated rotation state and the threshing clutch is engaged by instructing the threshing instruction by the mode instruction means. In order to travel on the headland at That the computer enters the clutch, the performed ones by a simple operation of only commanding threshing command in mode instruction means.
When the threshing clutch is in the engaged state and the accelerator means is in the rated rotation state, for example, when entering the uncut area from the headland and starting the cutting operation, the threshing clutch is in the engaged state and the accelerator means is After running through the headland in the rated rotation state, the cutting clutch and the threshing clutch can be put into the engaged state by a simple operation by simply instructing a cutting operation command by the mode command means. Also, when the mowing clutch and the threshing clutch are in the engaged state, for example, when running the headland after finishing the mowing operation, after the mowing clutch and the threshing clutch are engaged, the threshing clutch is Setting the accelerator means to the rated rotation state in the on-state can be performed by a simple operation by simply instructing a threshing command by the mode command means.
Accordingly, a work vehicle drive control device capable of simplifying the operation when performing the cutting operation has been obtained.

  According to an eighth feature of the present invention, in addition to the seventh feature, the mode command means includes a push-operation type work mode command operation switch that automatically returns to a non-operation state, and the control means However, when the work mode command operation switch is continuously pressed for a time shorter than the operation state determination setting time, it is determined that the cutting work command is commanded, and the work mode command operation switch is operated. It is characterized in that it is configured to determine that the threshing command has been commanded when the button is continuously pressed for a time longer than the set time for state determination.

That is, when the operation mode command operation switch is continuously pressed for a time shorter than the operation state determination setting time, the control means determines that a cutting work command has been commanded, and the work mode command operation switch By continuously pressing the operation state for a longer time than the operation state determination setting time, the control means determines that a threshing command has been commanded.
As described above, the state in which the threshing command is instructed and the state in which the reaping operation command is instructed can be selected and operated depending on the length of time that the operation mode command operation switch is pressed. As compared with the case where the operation switch for instructing the cutting operation command and the operation switch for instructing the threshing command are provided separately, the configuration can be simplified.
Therefore, a work vehicle drive control device capable of simplifying the configuration has been obtained.

  In addition to any one of the first to eighth characteristic configurations, the ninth characteristic configuration of the present invention is a main that can be switched to an off state in which the power circuit is turned off and an on state in which the power circuit is turned on. A switch is provided, and the control means is configured to switch the accelerator means to the idling state and to disengage the work clutch when the main switch is switched from the off state to the on state. It is characterized by being configured to actuate the drive means.

That is, when the main switch is switched from the off state to the on state, the control means operates the switching operation drive means to switch the accelerator means to the idling state and the work clutch to the disengaged state.
In this way, the accelerator means can be switched to the idling state and the work clutch to the disengaged state by switching from the off state to the on state with the in switch. For example, the engine stops during the work, etc. Thus, even if the main switch is switched from the off state to the on state while the work clutch is kept engaged, if the main switch is switched from the off state to the on state, the accelerator means is set to the idling state and the work clutch is Since it is switched to the cut-off state, there is no inconvenience that the working device is unexpectedly driven when the engine is started.
Therefore, a work vehicle drive control device capable of preventing inconvenience that the work device is unexpectedly driven when the engine is started has been obtained.

  A tenth characteristic configuration of the present invention includes, in addition to any one of the first to ninth characteristic configurations described above, a traveling sub-transmission device that can be switched between a plurality of stages of high and low, and a shift state of the sub-transmission device Sub-shift state output means for outputting the control mode to the control means, and when the sub-transmission device is switched to the high-speed side shift state, the control means uses the mode command means to execute the work mode. A feature is that even if a command is issued, the command is invalidated.

In other words, in the state where the auxiliary transmission is switched to the high speed side shifting state, even if the work mode command is commanded by the mode command means, the command is invalidated.
Thus, in the state where the auxiliary transmission is switched to the high speed side shifting state, even if the work mode command is commanded by the mode command means, the command can be invalidated. It is possible to prevent inconvenience that the working device is unexpectedly driven when traveling at high speed.
In other words, in general, when the vehicle travels at a high speed, the sub-transmission device is set to the high-speed side shifting state. Therefore, in the state where the sub-transmission device is switched to the high-speed side shifting state, the mode command means Even if the work mode command is commanded at, by disabling the command, it is possible to prevent inconvenience that the work device is unexpectedly driven when traveling at high speed.
Therefore, the present invention has led to a work vehicle drive control device that can prevent the work device from being inadvertently driven when traveling at high speed.

Eleventh characterizing feature of the present invention, in addition to any one of the characteristic structure of the first to tenth characterizing feature, the auxiliary speed change device of the switching 換自 standing traveling for the high and low a plurality of stages, of the auxiliary speed change device A sub-shift state output means for outputting a shift state to the control means, and the control means operates the accelerator in the rated rotational state and the work clutch in the engaged state in response to a command of the work mode command. When the auxiliary transmission is switched to the high speed side shifting state, the switching operation driving means is operated so that the accelerator means is in the rated rotation state and the work clutch is disengaged. It is characterized in that it is configured.

That is, when the accelerator is operated in the rated rotation state and the work clutch is in the engaged state according to the command of the work mode command, the control device operates the drive device for switching operation when the sub-transmission device switches to the high-speed side shift state. Thus, the accelerator means is switched to the rated rotation state and the work clutch is switched to the disengaged state.
In this way, in a state where the accelerator is operated in the rated rotation state and the work clutch is in the engaged state in accordance with the command of the work mode command, the auxiliary transmission device is switched to the speed change state on the high speed side, thereby bringing the accelerator means into the rated rotation state and Since the work clutch can be switched to the disengaged state, even if the sub-transmission device is switched to the high speed side shift state and traveling at a high speed, even if the forgoing to switch the work clutch to the disengaged state is forgotten, If the device is switched to the high speed side shift state, the accelerator means is switched to the rated rotation state and the work clutch is disengaged, so that the inconvenience of traveling at high speed while the work device is driven can be prevented. it can. In addition, in a state where the accelerator is operated in the rated rotation state and the work clutch is in the engaged state in accordance with the command of the work mode command, the accelerator means is brought into the rated rotation state and the work clutch by switching the sub-transmission device to the high-speed side shift state. When the sub-transmission device is switched to the high-speed side shifting state and traveling at a high speed, it is possible to simply switch the sub-transmission device to the high-speed side shifting state. The accelerator means can be switched to the rated rotation state and the work clutch can be switched to the disengaged state.
Therefore, it is possible to prevent the inconvenience of traveling at high speed while the working device is driven, and to simplify the operation when traveling at high speed by switching the sub-transmission device to the high speed side shifting state. It came to obtain the drive control device of the car.

[First Embodiment]
A working vehicle drive control apparatus according to the present invention will be described below with reference to the drawings.
FIG. 1 shows an overall side view of the combine. The combine is configured so that the traveling machine body 2 can freely travel by driving a pair of left and right crawler type traveling devices 1L, 1R, and at the front of the traveling machine body 2, A harvesting processing device 3 that can move up and down and harvests the planted cereals in the field and conveys the harvested cereals to the rear is provided. A threshing device 4 for threshing and sorting, and a grain tank 5 for storing the grains obtained by threshing and sorting by the threshing device 4, and at a location in front of the grain tank 5 A boarding operation unit 6 is formed.

Next, the transmission structure of this combine will be described.
As shown in FIGS. 2 and 3, the power of the engine E is transmitted to the continuously variable continuously variable transmission 7 and the continuously variable transmission 8 for turning through the transmission belt 14 and the transmission pulley 15. The shift outputs of the devices 7 and 8 are transmitted to the traveling devices 1R and 1L via the mission case 9, respectively. Of these continuously variable transmissions 7 and 8, the speed change output of the continuously variable continuously variable transmission 7 is transmitted to the harvesting processing device 3 via the harvesting clutch 10 after passing through the mission case 9. Is provided with a reaping sensor 11 for detecting the on / off state. The power of the engine E is transmitted to the threshing device 4 via the threshing clutch 12, and the threshing clutch 13 is attached to the threshing clutch 12 to detect the on / off state.

  Therefore, the working device F is the threshing device 4 mounted on the combine and the reaping processing device 3 for reaping and supplying the cereal husk to the threshing device 4, and the working clutch C sends the output of the engine E to the threshing device 4. A threshing clutch 12 that can be switched between a transmission state and a cut-off state that interrupts transmission of the output of the engine E to the threshing device 4, and a transmission state that transmits the output of the engine E to the cutting processing device 3 and the engine E. This is a cutting clutch 10 that can be switched to a cut-off state that interrupts transmission of output to the cutting processing device 3.

  The continuously variable continuously variable transmission 7 and the continuously variable continuously variable transmission 8 are variable hydraulic pumps 7A and 8A that are driven by power from an engine mounted on a combined traveling machine body, and the variable hydraulic pump 7A. , A hydrostatic continuously variable transmission (HST) having a well-known structure constituted by a pair of hydraulic motors 7B and 8B that are rotationally driven by supply oil from 8A. Incidentally, the power of the engine E is transmitted to the transmission shaft 16 of the variable hydraulic pumps 7A and 8A via the transmission belt 14 and the transmission pulley 15.

  The transmission case 9 has an output shaft 17 of the continuously variable transmission 7 for straight traveling and an output shaft 18 of the continuously variable transmission 8 for turning inserted therein. The shift output from the left and right traveling devices 1R, 1L is transmitted to the pair of left and right traveling devices 1R, 1L, while the shift output from the output shaft 17 of the continuously variable transmission 7 for straight travel is transmitted to the cutting processing device 3. ing. A right output gear 18a and a left output gear 18b are fixed to the output shaft 18 of the continuously variable transmission 8 for turning.

  A pair of large and small output gears 17a, 17b for sub-shifting and an output gear 17c for driving the cutting part are fixed to the output shaft 17 of the continuously variable transmission 7 for linear movement. The auxiliary transmission shaft 19 supports an auxiliary transmission small-diameter gear 19a and a large-diameter gear 19b that are always meshed with the output gears 17a and 17b. The auxiliary transmission shaft 19 is relatively rotatably supported. A sub-shift gear 19d that rotates integrally with the transmission shaft 19 is externally fitted to be slidable in the axial direction. A sub transmission D for traveling that can be switched between two levels of high and low by sliding the sub shift gear 19d by a sub transmission lever (not shown) is configured. A sub-shift state detection sensor 41 that detects the shift state of the sub-transmission device D is provided. An output gear 19e is fixed to the auxiliary transmission shaft 19, and a center gear 21 provided integrally with the support shaft 20 is always in mesh with the output gear 19e.

  The support shaft 20 is provided with transmission state switching means A on both sides of the center gear 21. The transmission state switching means A has a left outer peripheral gear portion 22a that is always meshed with the left output gear 18a. The left multi-plate friction clutch 22 provided on the left side, the right multi-plate friction clutch 22 provided with the right outer peripheral gear portion 22b always meshed with the right output gear 18b, and both side surfaces of the center gear 21 are opposed thereto. And a pair of left and right meshing clutches 24, 24 formed between the shift gear 23.

  The left friction clutch 22 constitutes a left clutch that can be switched to a state in which transmission between the continuously variable transmission 8 for turning and the left traveling device 1L is cut off. The right friction clutch 22 is used for turning. A right-side clutch that can be switched to a state in which transmission between the continuously variable transmission 8 and the right-side traveling device 1R is cut off is configured.

  The left and right shift gears 23 can be shifted in the direction of the axis of rotation, and when the shift operation is performed, the meshing clutch 24 meshes and enters a transmission state, and the meshing clutch 24 shuts off a transmission that does not mesh. The friction plate in the shift gear 23 is configured to be shiftable with respect to the main body of the friction clutch 22, and the multi-plate friction clutch 22 is in pressure contact and enters a transmission state. The plate-type friction clutch 22 is configured to be switchable to a state in which transmission that is not in pressure contact is cut off.

In other words, power is transmitted to the pair of left and right traveling devices 1L and 1R in the transmission state where the meshing clutch 24 is meshed with the power transmitted from the continuously variable transmission 7 for straight travel and the friction clutch 22 is in pressure contact. In the state, if the power from the continuously variable transmission 8 for turning is transmitted and both the meshing clutch 24 and the friction clutch 22 are in the transmission state, the continuously variable transmission 7 for straight traveling and the continuously variable transmission for turning are used. If the power from both of the devices 8 is transmitted and both the meshing clutch 24 and the friction clutch 22 are in the transmission cut-off state, from either the continuously variable transmission 7 for straight traveling or the continuously variable transmission 8 for turning Also, power is not transmitted.

  The left and right shift gears 23, 23 are urged into a transmission state in which the meshing clutches 24, 24 are meshed by the pressing force of the pressure springs 25, 25, respectively. By shifting the hydraulic cylinders 26L and 26R for blocking against the pressing force of the clutch 25, the clutch clutch 24 and 24 can be switched to a transmission cutoff state where the clutches 24 and 24 are not engaged.

In this transmission cut-off state, the friction plate in the shift gear 23 is shifted by the steering hydraulic cylinders 27L and 27R, so that the operation can be switched to the transmission state in which the friction clutches 22 and 22 are in pressure contact. The steering hydraulic cylinders 27L and 27R and the cutoff hydraulic cylinders 26L and 26R are operated by switching the steering solenoid valves 29L and 29R and the cutoff solenoid valves 28L and 28R. .
The shift gear 23 is transmitted to the pair of left and right traveling devices 1L and 1R via the final gear 30. The shift gear 23 is configured to always mesh with the relay gear 31 of the transmission system to the traveling device when the meshing clutch 24 is meshed and not meshed.

  As a result, the left and right meshing clutches 24 are switched to the transmission engagement state, and the left and right friction clutches 22 are switched to the transmission cutoff state, whereby the straight meshing transmission state is established, and the right meshing clutch 24 is switched to the transmission engagement state, and the right friction The clutch 22 is switched to the transmission cut-off state, the left meshing clutch 24 is switched to the transmission cut-off state, and the left friction clutch 22 is switched to the transmission-engaged state to enter the left-turning transmission state, and the right meshing clutch 24 is cut off from the transmission. Switch to the state, switch the right friction clutch 22 to the transmission-entered state, switch the left meshing clutch 24 to the transmission-entered state, and switch the left friction clutch 22 to the transmission cut-off state, thereby entering the right-turning transmission state. The left and right meshing clutches 24 are switched to the transmission cut-off state, and the left and right friction clutches 22 are By switching to dynamic cut-off state, and is configured such that a neutral state.

  That is, with the left and right meshing clutches and the left and right friction clutches as the main parts, a straight transmission state in which the transmission output of the continuously variable transmission 7 for straight traveling is transmitted to each of the pair of left and right traveling devices 1L and 1R, The left turn transmission state in which the speed change output of the continuously variable transmission 7 is transmitted to the right traveling device 1R and the speed change output 8 of the turning continuously variable transmission is transmitted to the left traveling device 1L. A right-turn transmission state in which the shift output of the transmission device 7 is transmitted to the left travel device 1L and the shift output of the continuously variable transmission device 8 is transmitted to the right travel device 1R. A transmission state switching means A is configured which can be switched to a neutral state in which neither the transmission output of the transmission 7 nor the continuously variable transmission 8 for turning is transmitted to each of the pair of left and right traveling devices 1L, 1R.

  As shown in FIGS. 4 to 10, a speed adjustment lever 42 as an accelerator means that can be switched between a rated rotational state in which the engine E is rotated at a set rated rotational speed and an idle state in which the engine E is rotated at an idle rotational speed. Is provided in the engine E, and is switched as drive means for switching operation for switching operation between the engaged state and disengaged state of the cutting clutch 10 and the threshing clutch 12 and switching operation between the rated rotation state and the idling state of the speed adjusting lever 42. An operation motor M is provided.

  In other words, the interlock operation unit B that operates the speed adjustment lever 42, the mowing clutch 10, and the threshing clutch 12 in conjunction with the rotation operation of the switching operation motor M is provided on the driver seat 43 of the boarding operation unit 6. It is provided in a state located on the side. The interlocking operation unit B presses the sector gear 44 meshing with the pinion gear 47 of the switching operation motor M, the accelerator lever 45 from the cut position to the entry position, and switches the speed adjustment lever 42 from the idling state to the rated rotation state. An accelerator lever operation cam 46, a threshing clutch operation link portion 48 for switching the threshing clutch 12, and a cutting clutch operation link portion 49 for switching the reaping clutch 10 are provided. Two substantially cylindrical rotating boss portions 51 are rotatably provided in a substantially rectangular parallelepiped frame portion 50 fixed to the boarding operation portion 6, and an accelerator lever is provided on the outer side of one rotating boss portion 51. While the operation cam 46 is attached, one end of the support shaft 52 is attached to the inner side of one rotating boss portion 51, and the other end of the support shaft 52 is attached to the inner side of the other rotating boss portion 51. A sector gear 44, a threshing clutch operating link portion 48, and a cutting clutch operating link portion 49 are attached to the support shaft 52. As a result, when the switching operation motor M is driven, the sector gear 44 meshing with the pinion gear 47 of the switching operation motor M is also rotated, and the accelerator lever operation is performed as the sector gear 44 rotates. The cam 46, the threshing clutch operating link 48, and the cutting clutch operating link 49 are configured to rotate integrally.

  The accelerator lever 45 is swingably supported by a support shaft portion 53 provided in the frame portion 50. A grip 45a is provided at the distal end of the accelerator lever 45, a cam follower 54 is provided at the base end of the accelerator lever 45, and a speed adjusting lever operating cable 55 is attached thereto. By swinging the grip 45a of the accelerator lever 45 and changing the position of the accelerator lever 45 from the cut position to the entry position, the speed adjustment lever operation cable 55 provided on the accelerator lever 45 is pulled to adjust the speed. The lever 42 is switched from the idling state to the rated rotation state. Incidentally, when the grip portion 45a of the accelerator lever 45 is not swung, the speed adjustment lever 42 is switched from the rated rotation state to the idling state by a biasing force of a spring (not shown).

  The accelerator lever operation cam 46 is formed in a plate shape close to a half moon with a part of a disc cut out, and a cam surface 46a is formed in the cutout portion. As the accelerator lever operation cam 46 rotates, the cam surface 46a presses against the cam follower 54 provided on the accelerator lever 45 to change the position of the accelerator lever 45 from the cut position to the entry position, thereby adjusting the speed. By pulling the lever operating cable 55, the speed adjusting lever 42 is switched from the idling state to the rated rotation state. Further, interlock operation unit position detection limit switches 101a, 101b, and 101c are provided at the peripheral edge of the accelerator lever operation cam 46 so as to detect the position of the interlock operation unit B.

The threshing clutch operating link portion 48 is connected to the threshing clutch operating mounting plate 56 fixed to the support shaft 52, and is connected to the threshing clutch operating mounting plate 56 through a connecting pin so as to be relatively rotatable. The chopping clutch operating link 49 is configured to include an L-shaped link 58 for threshing clutch operation to which an operation cable 57 is attached. A cutting clutch operating L-shaped link 61 is connected to the operating mounting plate 59 via a connecting pin so as to be relatively rotatable, and a cutting clutch operating cable 60 is mounted.
Then, as the support shaft 52 rotates, the threshing clutch operation mounting plate 56 swings with the base end fixed to the support shaft 52 as a swing fulcrum, and rotates relative to the threshing clutch operation mounting plate 56. The threshing clutch operating cable 57 attached to the threshing clutch operating L-link 58 that is movably connected is pulled to switch the threshing clutch 12 to the on state, and as the support shaft 52 rotates. The cutting clutch operating attachment plate 59 swings with the base end portion fixed to the support shaft 52 as a swing fulcrum, and is connected to the cutting clutch operation mounting plate 59 so as to be relatively rotatable. The cutting clutch operating cable 60 attached to the L-shaped link 61 is pulled to switch the cutting clutch 10 to the on state.

When the switching operation motor M is driven to rotate in the forward and reverse directions, the interlocking operation portion B is rotated forward and backward around the axis of the support shaft 52, and the travel stop position shown in FIG. 7, the travel position shown in FIG. The threshing position shown in FIG. 9 and the cutting work position shown in FIG.
In other words, as shown in FIG. 7, when the interlock operation portion B is located at the travel stop position, the cam surface 46a of the accelerator lever operation cam 46 comes into contact with the cam follower 54, so that the accelerator lever 45 is cut off. The speed adjustment lever 42 is maintained in the idling state. Incidentally, both the threshing clutch 12 and the reaping clutch 10 are in the disengaged state at this travel stop position. At this time, the interlock operation unit position detection limit switches 101a and 101b are in the on state, and the interlock operation unit position detection limit switch 101c is in the off state.

  As shown in FIG. 8, when the switching operation motor M is driven to rotate in the forward direction, the cam surface 46a of the accelerator lever operation cam 46 is connected to the cam follower when the interlocking operation unit B changes its position from the travel stop position to the travel position. By pressing the lever 54, the accelerator lever 45 is switched from the cut position to the entry position, and the speed adjustment lever 42 is switched from the idling state to the rated rotation state. Incidentally, in this running position, both the threshing clutch 12 and the reaping clutch 10 are in a disengaged state. At this time, the interlock operation unit position detection limit switch 101b is turned on, and the interlock operation unit position detection limit switches 101a and 101c are turned off.

  As shown in FIG. 9, the outer peripheral surface 46 b of the accelerator lever operation cam 46 is connected to the cam follower 54 when the interlock operation unit B is changed from the travel position to the threshing position by driving the switching operation motor M in the normal direction. , The accelerator lever 45 is maintained in the entering position, and the speed adjusting lever 42 is maintained in the rated rotational state. The mowing clutch operation mounting plate 59 swings in a direction substantially perpendicular to the direction in which the mowing clutch operation cable 60 extends, so that the mowing clutch operating L is connected to the mowing clutch operation mounting plate 59 so as to be relatively rotatable. The cutting clutch operating cable 60 attached to the character link 61 is hardly pulled, and the cutting clutch 10 is maintained in the cut position. Since the threshing clutch operating mounting plate 56 swings in the extending direction of the threshing clutch operating cable 57, the threshing clutch operating mounting plate 56 is attached to the threshing clutch operating L-shaped link 58 connected to the threshing clutch operating mounting plate 56 so as to be relatively rotatable. The threshing clutch operating cable 57 is pulled to switch the threshing clutch 12 from the disengaged state to the on state. At this time, the interlock operation unit position detection limit switches 101a, 101b, and 101c are in the OFF state.

As shown in FIG. 10, the outer peripheral surface 46b of the accelerator lever operation cam 46 is a cam follower when the interlocking operation part B is moved from the threshing position to the mowing work position by driving the switching operation motor M to rotate forward. By abutting 54, the accelerator lever 45 is maintained in the entering position, and the speed adjustment lever 42 is maintained in the rated rotation state. Since the mowing clutch operation mounting plate 59 swings in the direction in which the mowing clutch operation cable 60 extends, the mowing clutch operating mounting plate 59 is attached to the mowing clutch operating L-shaped link 61 connected to the mowing clutch operating mounting plate 59 so as to be relatively rotatable. The reaping clutch operating cable 60 is pulled to switch the reaping clutch 10 from the disengaged position to the engaged state. Since the threshing clutch operation mounting plate 56 swings in a direction substantially orthogonal to the direction in which the threshing clutch operation cable 57 extends, the threshing clutch operation L connected to the threshing clutch operation mounting plate 56 in a relatively rotatable manner. The threshing clutch operating cable 57 attached to the character link 58 is hardly pulled, and the threshing clutch 12 is maintained in the on state. At this time, the interlock operation unit position detection limit switches 101a and 101b are turned off, and the interlock operation unit position detection limit switch 101c is turned on.
Incidentally, when the switching operation motor M is reversely driven to move the interlock operation portion B from the cutting work position to the travel stop position, the speed adjustment lever 42 is moved from the rated rotation state to the idling state by the biasing force of the spring. And the position of the accelerator lever 45 is changed from the entry position to the cut position.

  With the above configuration, when the interlocking operation part B is rotated forward around the axis of the support shaft 52, the speed adjustment lever 42 is in the idling state, the threshing clutch 12 and the reaping clutch 10 are in the disengaged state, and the speed adjustment. Running position where the lever 42 is in the rated rotation state, the threshing clutch 12 and the reaping clutch 10 are in the disengaged state, the speed adjustment lever 42 is in the rated rotational state, the threshing clutch 12 is in the engaged state, and the threshing position where the reaping clutch 10 is in the disengaged state The adjustment lever 42 is configured to sequentially switch to the cutting operation position where the rated rotation state, the threshing clutch 12 is engaged, and the cutting clutch 10 is engaged. Incidentally, the speed adjustment lever 42 can be switched from the idling state to the rated rotation state by operating the accelerator lever 45 in a state where the interlocking operation portion B is located at the travel stop position.

  The boarding operation unit 6 can be freely moved along a front-rear direction over a predetermined front-rear operation range, and a manually operated main transmission lever 69 for commanding a traveling speed by the front-rear direction movement operation, switching between the front-rear direction A manually-operated sub-shift lever (not shown) that commands the shift state of the sub-transmission device D by operation, a rectilinear command position N that commands rectilinear advance, and a left turn command that commands a left turn adjacent to the rectilinear command position N The position and the right turn command position where the right turn command position is commanded to be adjacent to the straight advance command position N can be moved, and the left and right movement operations can be performed straight, left turn and right turn. The turning lever 70 to be commanded, the turning mode switching operation tool 73 for switching the turning mode in three stages by dial operation, and the operation for switching the speed adjustment lever 42 between the on position and the cutting position. Lever 45, push-operated travel mode command operation switch 71, travel stop mode command operation switch 72, mowing operation command operation switch 74, threshing command operation switch that automatically returns to a non-operation state as mode command means G 75, a main switch 76 that can be switched to an off state in which a power supply circuit (not shown) is turned off by a key operation and an on state in which the power supply circuit is turned on.

  The linearly variable continuously variable transmission 7 has a configuration capable of stepless speed change operation from the neutral position in each of the forward rotation direction and the reverse rotation direction. The main transmission lever 69 provided in the boarding operation unit 6 Shifting operation can be performed by manual operation.

  In other words, the main transmission lever 69 is configured to be swingable by manual operation over a predetermined front-rear operation range along the front-rear direction from the neutral position. As shown in FIG. 11, the straight traveling swash plate 77 of the variable hydraulic pump 7 </ b> A is linked to the main transmission lever 69 via the hydraulic servo mechanism SV, and based on the operation command of the main transmission lever 69, the straight traveling swash plate 77. By changing the angle, the output state on the hydraulic motor 7B side is changed steplessly. That is, if there is a manual operation on the main transmission lever 69, the shift operation can be lightly operated by performing an assist operation with a hydraulic operation force by the action of the hydraulic servo mechanism SV. .

  Then, as shown in FIG. 12, when the main transmission lever 69 is in the neutral range and the neutral state is commanded, the straight traveling swash plate 77 becomes neutral, and the hydraulic motor 7B does not rotate and is maintained in the stopped state. If the command from the main speed change lever 69 is a speed change command to the forward speed increase side or the reverse speed increase side, the angle of the straight swash plate 77 is rotated forward by the hydraulic servomechanism SV according to the operation command of the main speed change lever 69. The hydraulic motor 7B is tilted by a command amount by the main transmission lever 69 in the direction (forward acceleration direction) or reverse direction (reverse acceleration direction) by the hydraulic operating force, and the hydraulic motor 7B rotates in the forward or reverse direction at a speed according to the command. The gears are operated so as to be rotationally driven.

As with the continuously variable continuously variable transmission 7, the turning continuously variable transmission 8 is configured to be continuously variable in both the forward direction and the reverse direction. Shifting operation can be performed by HS.
In other words, the turning swash plate 78 of the variable hydraulic pump 8A is linked to the hydraulic shift operation means HS, and the output state on the hydraulic motor 8B side is changed by changing the swash plate angle by the shift operation means HS. Is configured to do. As shown in FIG. 11, the speed change operation means HS includes a double action type speed change hydraulic cylinder 79 connected to a turning swash plate 78 in the turning continuously variable transmission 8, and the speed change hydraulic cylinder 79. And a hydraulic control unit VU for switching the supply / discharge state of the hydraulic oil. The shift hydraulic cylinder 79 is configured as a double-acting type that can be operated from the neutral position in the forward direction and in the reverse direction, and is urged to return to the neutral position by the urging force of a pair of left and right springs 79a and 79b. It becomes the composition which is done.

  When the shift operation of the continuously variable continuously variable transmission 7 and the continuously variable continuously variable transmission 8 is described, the shift positions of the swash plates 77 and 78 are set to the linearly-directed command position N as shown in FIG. The shift output (running speed) is zero if it is in the neutral region having a predetermined width including the predetermined width, and when the shift positions of the swash plates 77 and 78 are rotated from the neutral region to the predetermined direction, there is no travel speed in the forward direction. When the swash plate 77, 78 is operated in a direction opposite to the predetermined direction from the neutral region, the traveling speed in the reverse direction is increased steplessly.

As shown in FIG. 11, the output rotation speeds of the turning lever sensor 91, which is a rotary potentiometer for detecting the operation position of the turning lever 70, and the pair of continuously variable transmissions 7, 8, are output to the output gear 19e and the right output. Rotation sensors 92 and 93 that detect by counting the number of teeth of the gear 18a, a potentiometer type linear shift position sensor 94 that detects a swash plate angle of the straight swash plate 77 of the continuously variable transmission 7 for linear movement, A potentiometer-type turning position sensor 95 for detecting the swash plate angle of the turning swash plate 78 of the continuously variable transmission 8 for turning, a mode sensor 96 for detecting the operation position of the turning mode switching operation tool 73, and a traveling mode. A travel mode command operation switch detection sensor 87 that detects a pressing operation of the command operation switch 71, and a travel stop mode command operation switch 72. Detecting the push operation of the travel stop mode command operation switch detection sensor 88 for detecting the cutting operation, the cut operation command operation switch detection sensor 89 for detecting the push operation of the cut operation command operation switch 74, and the push operation of the threshing command operation switch 75 Operation switch detection sensor 90 for threshing command to be performed, main switch detection sensor 99 for detecting the ON state and the OFF state of the main switch 76, the sub shift state detection sensor 41 for detecting the shift state of the sub transmission D, the interlock operation unit B The interlock operation unit position detecting volume 100 for detecting the position of the interlocking operation unit B and the interlocking operation unit position detecting limit switches 101a, 101b, 101c for detecting the position of the interlocking operation unit B are provided. HS, steering hydraulic cylinders 27R, 27L, cutoff hydraulic cylinders 26R, 26L, off Control for controlling the operation of the operation motor M and lighting of the travel mode command operation switch 71, travel stop mode command operation switch 72, mowing operation command operation switch 74, threshing command operation switch 75, and alarm lamp 102 A control device H is provided as control means using a microcomputer as means.
The straight shift position sensor 94 outputs a voltage corresponding to the angle (tilt position) of the straight travel swash plate 77 in the continuously variable transmission 7 for straight travel, and the voltage is A / D converted. The detected value for straight travel is input to the control device H, and the turning shift position sensor 95 outputs a voltage corresponding to the angle (tilting position) of the turning swash plate 78 in the continuously variable transmission 8 for turning. The voltage is A / D converted and input to the control device H as a detected value for turning.

  The turning control by the control device H will be further described. Shifting of the hydraulic servomechanism SV for changing the speed of the continuously variable continuously variable transmission 7 and the speed change operation means HS for changing the speed of the continuously variable transmission 8 for turning. Hydraulic cylinder 79, and a control device H that controls the operation of the speed change operation means HS and switches the transmission state switching means A so as to be in the running state commanded by the turning lever 70. When H is commanded to go straight by the turning lever 70, the continuously variable transmission 7 for straight running is operated to change to the traveling speed commanded by the main speed changing lever 69, and no turning is made. A straight-ahead control process for shifting the step transmission 8 so as to be the same as the detection speed of the rotation sensor 59 for detecting the rotation speed of the continuously variable continuously variable transmission 7 is executed. Left turn When a right turn is commanded, the continuously variable transmission 7 for straight travel is shifted so that the traveling speed commanded by the main shift lever 69 is reached, and the continuously variable transmission 8 for turning is turned on. It is configured to execute a turning control process in which a speed change operation is performed so as to achieve a turning target speed.

  The hydraulic servo mechanism SV is configured to shift the linearly variable continuously variable transmission 7 so as to have a traveling speed commanded by the main shift lever 69 as a change in the operation position. The control device H that controls the operation of the HS and the speed change operation means HS changes the speed of the continuously variable transmission 8 for turning by the speed change hydraulic cylinder 79 so that the speed is the same as the speed detected by the rotation sensor 92. Is configured to do.

  When the switching control of the speed adjustment lever 42, the threshing clutch 12, and the mowing clutch 10 by the control device H is described, the mowing work command operation switch 74 and the threshing command operating switch 75 are in a state of instructing a work mode command. The travel mode command operation switch 71 is configured to be freely operated so as to command the travel mode command, and the travel stop mode command operation switch 72 is operated to command the travel stop mode command. When the operation mode command is instructed by the cutting switch command operation switch 74 and the threshing command switch 75, the control device H is in the rated rotation state and the work clutch C is engaged. When the travel mode command is commanded by the travel mode command operation switch 71, the speed adjustment lever 42 is set to the rated rotation state and the work clutch C is disengaged, and when the travel stop mode command is commanded by the travel stop mode command operation switch 72, the speed adjustment lever 42 is set to the idling state and the work clutch C is disengaged. Thus, the switching operation motor M is configured to operate.

  When the main switch 76 is switched from the off state to the on state, the control device H operates the switching operation motor M so that the speed adjustment lever 42 is in the idling state and the work clutch C is in the disengaged state. It is configured. Further, when the control device H is in a state in which the sub-transmission device is switched to the high-speed gear shift state, even if a work mode command is commanded by the mowing work command operation switch 74 and the threshing command operation switch 75, The command is configured to be invalidated. In addition, when the control device H operates the speed adjustment lever 42 in the rated rotation state and the work clutch C in the engaged state in accordance with the commands of the threshing command and the mowing operation command, the auxiliary transmission device D switches to the high speed gear shifting state. When this is done, the switching operation motor M is operated so that the speed adjustment lever 42 is in the rated rotation state and the work clutch C is in the disengaged state.

  In addition, the threshing command operation switch 75 is configured to be operable to command a clutch disengagement emergency operation command, and the cutting operation command operation switch 74 is operable to command a clutch engagement emergency operation command. The control device H is intermittently operated in the operation direction in which the work clutch C is disengaged while the clutch disengagement emergency operation command is instructed by the threshing command operation switch 75. In addition, while the emergency operation command for clutch engagement is instructed by the operation switch 74 for cutting operation command, the switching operation motor M is intermittently operated in the operation direction in which the work clutch C is engaged. It is configured.

  Further, the cutting switch command operation switch 74 and the threshing command switch 75 can be operated by selecting a state in which a threshing command is commanded and a state in which a cutting command is commanded as a commanding mode command. When the threshing command is instructed by the threshing command operation switch 75, the control device H sets the speed adjustment lever 42 to the rated rotation state, the threshing clutch 12 to the on state, and the cutting clutch 10 to the disengaged state, In addition, when a cutting operation command is commanded by the cutting operation command operation switch 74, the speed adjustment lever 42 is set to the rated rotation state and the threshing clutch 12 is turned on, and then the cutting clutch 10 is turned on. The switching operation motor M is configured to operate.

  Further, as shown in FIG. 14, as shown in FIG. 14, the travel mode command operation switch 71, the travel stop mode command operation switch 72, the cutting operation command operation switch 74, and the threshing command operation switch 75 are locked with a lamp. It consists of no switch. When the main switch 76 is switched from the off state to the on state, the engine E is started, the switching operation motor M is operated so that the interlock operation unit B is located at the travel stop position, and the travel mode command operation is performed. The switch 71, the travel stop mode command operation switch 72, the cutting operation command operation switch 74, and the threshing command operation switch 75 are turned off (see FIG. 14A). As a result, the speed adjustment lever 42 is set in an idling state, and the reaping clutch 10 and the threshing clutch 12 are set in a disconnected state.

  When the travel stop mode command operation switch 72 is pushed, the switching operation is performed so that the interlocking operation portion B is located at the travel stop position in the same manner as the main switch 76 is switched from the OFF state to the ON state. While operating the motor M, the travel mode command operation switch 71, the travel stop mode command operation switch 72, the cutting operation command operation switch 74, and the threshing command operation switch 75 are turned off.

  When the threshing command operation switch 75 is pushed, the switching operation motor M is operated so that the interlocking operation unit B is located at the threshing position, and the threshing command operation switch 75 is lit to drive the threshing command. The operation switch 71, the travel stop mode command operation switch 72, and the cutting operation command operation switch 74 are turned off (see FIG. 14B). Thereby, the speed adjustment lever 42 is set to the rated rotation state, the reaping clutch 10 is turned off, and the threshing clutch 12 is turned on.

When the mowing work command operation switch 74 is pushed, the switching operation motor M is operated so that the interlocking operation portion B is located at the mowing work position, and the mowing work command operation switch 74 is lit to run. The mode command operation switch 71, the travel stop mode command operation switch 72, and the threshing command operation switch 75 are turned off (see FIG. 14C). Thereby, the speed adjustment lever 42 is set to the rated rotation state, and the reaping clutch 10 and the threshing clutch 12 are set to the engaged state.
When the travel mode command operation switch 71 is pressed, the switching operation motor M is operated so that the interlock operation unit B is located at the travel position, and the travel mode command operation switch 71 is lit to stop the travel. The mode command operation switch 72, the mowing operation command operation switch 74, and the threshing command operation switch 75 are turned off (see FIG. 14D). Thereby, the speed adjustment lever 42 is set to a rated rotation state, and the reaping clutch 10 and the threshing clutch 12 are set to a disengaged state.

  In the case where the switching operation motor M is operated so that the interlock operation unit B is positioned at the cutting work position from the travel stop position or the travel position by driving the switching operation motor M in the forward rotation, Since it is located at the cutting work position from the traveling stop position or the traveling position via the threshing position, when the threshing command operation switch 75 and the cutting operation command operation switch 74 are pressed, the speed adjustment lever 42 is moved. The switching operation motor M is operated so that the threshing clutch 12 is in the engaged state and the reaping clutch 10 is in the disengaged state, and then the reaping clutch 10 is in the engaged state.

  Even if the threshing command operation switch 75 and the mowing operation command operation switch 74 are pressed, the switching operation motor M is not operated when the sub-transmission device D is in a high-speed shift state. The threshing command operation switch 75 is pushed, the speed adjustment lever 42 is in the rated rotation state, the threshing clutch 12 is in the on state, and the reaping clutch 10 is in the disengaged state. In the state where the speed adjustment lever 42 is in the rated rotation state and the threshing clutch 12 and the reaping clutch 10 are in the engaged state, when the sub transmission D is switched to the high speed gear shifting state by operating the sub transmission lever, The switching operation motor M is operated so that the interlock operation unit B is positioned at the travel position.

  The interlock operation unit B is positioned at a designated position by pressing the travel mode command operation switch 71, travel stop mode command operation switch 72, mowing operation command operation switch 74, and threshing command operation switch 75. When the switching operation motor M is operated, if the position detected by the interlock operation unit position detection limit switches 101a, 101b, 101c does not match the commanded position even if the set time has elapsed, it is abnormal. It is determined that there is, and the operation of the switching operation motor M is stopped and the warning lamp 102 is turned on. That is, by controlling the operation of the switching operation motor M so that the detection value of the interlock operation unit position detection volume 100 becomes a set value corresponding to the specified position, the interlock operation unit B is designated at the specified position. However, the interlocking operation unit B may not be positioned at the specified position due to, for example, a failure of the interlocking operation unit position detection volume 100 or the like. Therefore, if the positions detected by the interlocking operation unit position detection limit switches 101a, 101b, and 101c do not match the commanded position even after the set time has elapsed, it is determined that there is an abnormality. When the position detected by the interlock operation unit position detection limit switches 101a, 101b, and 101c exceeds the range from the travel stop position to the cutting work position, the operation of the switching operation motor M is immediately stopped. Then, after switching the main switch 76 from the on state to the off state, simultaneously pressing the mowing work command operation switch 74 and the threshing command operation switch 75 and switching the main switch 76 from the off state to the on state. Accordingly, the cutting operation command operation switch 74 and the threshing command operation switch 75 are blinked, and the cutting operation command operation switch 74 is pushed in the state where the cutting operation command operation switch 74 and the threshing command operation switch 75 are flashing. While being performed, the switching operation motor M is intermittently driven to rotate forward. Further, while the threshing command operation switch 75 and the threshing command operation switch 75 are blinking and the threshing command operation switch 75 is being pushed, the switching operation motor M is intermittently driven to rotate reversely. . Thereby, the threshing clutch 12 and the mowing clutch 10 can be switched to an on state or a cut state at an operation speed slower than a normal operation speed.

  Next, based on the flowchart of FIG. 15, the switching control of the speed adjustment lever 42, the threshing clutch 12, and the mowing clutch 10 will be described. When the main switch 76 is switched from the off state to the on state, the speed adjustment lever 42. In the idling state and the cutting clutch 10 and the threshing clutch 12 are turned off (step 1). When a threshing command is commanded by pressing the threshing command operation switch 75, the speed adjusting lever 42 is set to the rated rotation state and the threshing clutch 12 is set to the engaged state when the auxiliary transmission D is in the low speed gear shifting state. The mowing clutch 10 is turned off (steps 2 to 4). In the state where the speed adjustment lever 42 is in the rated rotation state, the threshing clutch 12 is in the engaged state, and the reaping clutch 10 is in the disengaged state in accordance with the command of the threshing command, the auxiliary transmission D is operated in the high-speed shift state by operating the auxiliary transmission lever. When switched to, the speed adjustment lever 42 is set to the rated rotation state, and the threshing clutch 12 and the reaping clutch 10 are turned off (steps 5 and 11). When a mowing work command is commanded by pressing the mowing work command operation switch 74, the speed adjusting lever 42 is set to the rated rotational state and the mowing clutch 10 and the threshing clutch when the auxiliary transmission D is in the low speed gear shifting state. 12 is set to the entering state (steps 6 to 8). In the state where the speed adjustment lever 42 is in the rated rotation state and the threshing clutch 12 and the mowing clutch 10 are in the engaged state in response to the mowing operation command, the subtransmission device D is switched to the high-speed gear shifting state by operating the subtransmission lever. When this occurs, the speed adjustment lever 42 is set to the rated rotation state, and the threshing clutch 12 and the reaping clutch 10 are turned off (steps 9 and 11). When a travel mode command is commanded by pressing the travel mode command operation switch 71, the speed adjustment lever 42 is set to the rated rotation state, and the reaping clutch 10 and the threshing clutch 12 are disconnected (steps 10 and 11). When a travel stop mode command is instructed by pressing the travel stop mode command operation switch 71, the speed adjustment lever 42 is set in an idling state and the reaping clutch 10 and the threshing clutch 12 are disconnected (steps 12 and 13). The switching operation described above is repeated while the main switch 76 is on (steps 2 to 14).

  The switching control of the speed adjusting lever 42, the threshing clutch 12, and the mowing clutch 10 by the control device H will be described based on the operation of the combine. When the main switch 76 is switched from the off state to the on state, the speed adjusting lever 42 is Since the reaping clutch 10 and the threshing clutch 12 are in the disengaged state in the idling state, they enter the field through the straw at a slow speed. When performing cutting work, when traveling on the headland, the threshing command operation switch 75 is pressed to switch the speed adjustment lever 42 from the idling state to the rated rotational state, and the threshing clutch 12 is switched from the disengaged state to the engaged state. Switch to. When traveling in an uncut region, the cutting operation command switch 74 is pressed to switch the cutting clutch 10 from the cut-off state to the on-state and perform the cutting operation. As described above, when the threshing command operation switch 75 is pushed, the speed adjustment lever 42 is switched from the idling state to the rated rotation state, and the threshing clutch 12 is switched from the disengaged state to the on state, so there is no need to operate the accelerator lever. Thus, the operation can be simplified. In addition, the cutting operation can be performed with a simple operation by repeatedly pressing the threshing instruction operation switch 75 and the cutting operation command operation switch 74. In the case of ending the harvesting operation, if the travel mode command operation switch 71 is pressed, the harvesting clutch 10 and the threshing clutch 12 are switched from the on state to the off state, so that the reaping processing device 3 and the threshing device 4 are surely stopped. It will be possible to travel in the state of being.

  When the process for controlling the operation of the speed change operation means HS so that the turning continuously variable transmission 8 has the turning target speed is described, the turning amount of the turning lever 70 in the direction away from the neutral position is The relationship with the speed ratio corresponding to the turning radius is determined and stored as the relationship corresponding to the quadratic function as shown in FIG. On the other hand, a target shift position as a target speed of the continuously variable transmission 8 for turning, that is, a target swash plate position, based on the detected value for straight travel from the shift position sensor 94 for straight travel and a function having a relationship as shown in FIG. Is demanded. The shift operation is performed by controlling the operation of the shift operation means HS so that the turning detection value from the turning shift position sensor 95 becomes the target shift value. Incidentally, the speed change position of the continuously variable continuously variable transmission device 7 is adjusted by manual operation of the main transmission lever 69.

  13 will be described. The line L1 in FIG. 13 indicates the speed of the continuously variable transmission on the straight running side as a reference, the line L2 indicates the change in the target rotational speed in the slow turning mode, and the line L3 indicates the signal. A change in the target rotation speed in the ground turning mode is shown, and a line L4 shows a change in the target rotation speed in the super turning mode, and the turning mode designated by the turning mode switching operation tool 73 is selected. become. In other words, in the gentle turning mode indicated by the line L2, when the turning lever 70 is operated to the maximum operating position, the turning side traveling device is about 1/3 of the traveling speed V of the opposite side traveling device. A change characteristic of the speed ratio of the left and right traveling apparatuses 1R and 1L with respect to the operation position of the turning lever 70 is set in advance so as to be decelerated to the speed. In the belief turning mode indicated by the line L3, when the turning lever 70 is operated to the maximum operating position, the operation position of the turning lever 70 is decelerated until the traveling speed of the turning side traveling device becomes zero. The speed ratio of the left and right traveling devices 1R, 1L is preset. Also, in the super turning mode indicated by the line L4, when the turning lever 70 is operated to the maximum operation position, the running speed of the turning side traveling device is rotated reversely to the drive rotation direction of the opposite side traveling device. The speed ratio of the left and right traveling apparatuses 1R and 1L with respect to the operation position of the turning lever 70 is set in advance so as to be the same speed as the speed of the opposite traveling apparatus in the direction.

[Second Embodiment]
Hereinafter, the second embodiment of the turning control device for a work vehicle according to the present invention will be described. However, the basic configuration is the same as that of the first embodiment, and therefore the same configuration is described in the first embodiment. The same reference numerals as those in the embodiment are attached, and the description is omitted.
Of the push operation type travel mode command operation switch 71, the travel stop mode command operation switch 72, the cutting operation command operation switch 74, and the threshing command operation switch 75 that automatically return to the non-operation state as the mode command means G The travel stop mode command operation switch 72 is omitted. Then, a travel mode command operation switch detection sensor 87 for detecting a push operation of the travel mode command operation switch 71, a mowing work command operation switch detection sensor 89 for detecting a push operation of the mowing work command operation switch 74, and a threshing command. Based on the input information of the threshing command operation switch detection sensor 90 that detects the pressing operation of the operation switch 75 for operation, the operation of the switching operation motor M, the operation switch 71 for travel mode command, and the operation switch 74 for cutting operation command. A control device H is provided as a control means using a microcomputer as a control means for controlling lighting of the threshing instruction operation switch 75.

As shown in FIG. 16, when the main switch 76 is switched from the off state to the on state, the speed adjustment lever 42 is set to the idling state, the threshing clutch 12 and the reaping clutch 10 are turned off, and the mode command operation switch 71 is set. Then, the cutting operation command operation switch 74 and the threshing command operation switch 75 are turned off (see FIG. 16A). When a threshing command is commanded by pressing the threshing command operation switch 75, the speed adjustment lever 42 is set to the rated rotation state, the threshing clutch 12 is turned on, and the reaping clutch 10 is turned off, and the threshing command operation switch 75 is turned on. Is turned on, and the cutting operation command operation switch 74 and the travel mode command operation switch 71 are turned off (see FIG. 16B). When a cutting operation command is instructed by pressing the cutting operation command operation switch 74, the speed adjustment lever 42 is set to the rated rotation state, the threshing clutch 12 and the cutting clutch 10 are turned on, and the cutting operation command operation switch 74 is turned on. The threshing command operation switch 75 and the travel mode command operation switch 71 are turned off (see FIG. 16C). When a travel mode command is commanded by pressing the travel mode command operation switch 71, the speed adjustment lever 42 is set to the rated rotation state, the threshing clutch 12 is disengaged and the reaping clutch 10 is disengaged, and the travel mode command The operation switch 71 is turned on, and the cutting operation command operation switch 74 and the threshing command operation switch 75 are turned off (see FIG. 16D).
Thus, even if the travel stop mode command operation switch 72 is omitted, when the main switch 76 is switched from the off state to the on state, the speed adjustment lever 42 is set to the idling state and the threshing clutch 12 and the reaping clutch 10 are turned off. Therefore, the configuration can be simplified without any inconvenience in operation .
[Third Embodiment]
Hereinafter, a third embodiment of the turning control device for a work vehicle according to the present invention will be described. Since the basic configuration is the same as that of the first embodiment, the same configuration is described in the first embodiment. The same reference numerals as those in the embodiment are attached, and the description is omitted.
Of the push operation type travel mode command operation switch 71, the travel stop mode command operation switch 72, the cutting operation command operation switch 74, and the threshing command operation switch 75 that automatically return to the non-operation state as the mode command means G The travel stop mode command operation switch 72 is omitted, and a travel lamp 103 is provided in place of the travel mode command operation switch 71. Based on the input information of the cutting operation command operation switch detection sensor 89 that detects the pressing operation of the cutting operation command operation switch 74 and the threshing command operation switch detection sensor 90 that detects the pressing operation of the threshing command operation switch 75. The control device H as a control means using a microcomputer as a control means for controlling the operation of the switching motor M and the lighting of the traveling lamp 103, the cutting operation command operation switch 74, and the threshing command operation switch 75. Is provided.

Then, as shown in FIG. 17, when the main switch 76 is switched from the off state to the on state, the speed adjustment lever 42 is set to the idling state, the threshing clutch 12 and the reaping clutch 10 are disengaged, the traveling lamp 103, the reaping work The command operation switch 74 and the threshing command operation switch 75 are turned off (see FIG. 17A). When a threshing command is commanded by pressing the threshing command operation switch 75, the speed adjustment lever 42 is set to the rated rotation state, the threshing clutch 12 is turned on, and the reaping clutch 10 is turned off, and the threshing command operation switch 75 is turned on. Is turned on, and the cutting operation command operation switch 74 and the traveling lamp 103 are turned off (see FIG. 17B). When a cutting operation command is instructed by pressing the cutting operation command operation switch 74, the speed adjustment lever 42 is set to the rated rotation state, the threshing clutch 12 and the cutting clutch 10 are turned on, and the cutting operation command operation switch 74 is turned on. The threshing command operation switch 75 and the travel lamp 103 are turned off (see FIG. 17C). When the threshing command operation switch 75 is continuously pressed, or when the travel mode command is commanded by continuously pressing the mowing operation command operation switch 74, the speed adjustment lever 42 is brought into the rated rotation state and threshing is performed. The clutch 12 is turned off and the cutting clutch 10 is turned off, the travel lamp 103 is turned on, and the cutting operation command operation switch 74 and the threshing command operation switch 75 are turned off (see FIG. 17 (d)).
Thus, by providing the travel lamp 103 in place of the travel mode command operation switch 71, the configuration can be further simplified.
[Fourth Embodiment]
Hereinafter, the fourth embodiment of the turning control device for a work vehicle according to the present invention will be described. The basic configuration is the same as that of the first embodiment, and therefore the same configuration is described in the first embodiment. The same reference numerals as those of the embodiment are attached, and the description is omitted.
Of the push operation type travel mode command operation switch 71, the travel stop mode command operation switch 72, the cutting operation command operation switch 74, and the threshing command operation switch 75 that automatically return to the non-operation state as the mode command means G The travel stop mode command operation switch 72 is omitted, and a push operation type work mode command operation switch 104 that automatically returns to a non-operation state is provided instead of the cutting operation command operation switch 74 and the threshing command operation switch 75. It has a configuration. Then, based on input information of a work command operation switch detection sensor for detecting a push operation of the work mode command operation switch 104 and a travel mode command operation switch detection sensor 87 for detecting a push operation of the travel mode command operation switch 71. And a control device H as a control means using a microcomputer as a control means for controlling the operation of the switching operation motor M and the lighting of the travel mode command operation switch 71 and the work mode command operation switch 104. ing.

  As shown in FIG. 18, when the main switch 76 is switched from the off state to the on state, the speed adjustment lever 42 is set to the idling state, the threshing clutch 12 and the reaping clutch 10 are turned off, and the operation switch for operating the work mode is set. 104, the running mode command operation switch 71 is turned off (see FIG. 18A). When the operation mode command operation switch 104 is continuously pressed for a time shorter than the operation state determination setting time, it is determined that a cutting operation command has been issued, and the speed adjustment lever 42 is set to the rated rotation state and the threshing clutch 12 and The mowing clutch 10 is turned on, the work mode command operation switch 104 is turned on, and the travel mode command operation switch 71 is turned off (see FIG. 18B). When the operation mode command operation switch 104 is continuously pressed for a time longer than the operation state determination setting time, it is determined that the threshing command is commanded, the speed adjustment lever 42 is set to the rated rotation state, and the threshing clutch 12 is turned on. The engaged state is set and the cutting clutch 10 is disengaged, the work mode command operation switch 104 is blinked, and the travel mode command operation switch 71 is turned off (see FIG. 18C). When a travel mode command is commanded by pressing the travel mode command operation switch 71, the speed adjustment lever 42 is set to the rated rotation state, the threshing clutch 12 is disengaged and the reaping clutch 10 is disengaged, and the travel mode command The operation switch 71 is turned on, and the work mode command operation switch 104 and the threshing command operation switch 75 are turned off (see FIG. 18D).

[Another embodiment]
(1) In the above-described embodiment, the configuration in which the working device F is the threshing device 4 equipped with the combiner as the work vehicle and the reaping processing device 5 for harvesting and supplying the cereal husk to the threshing device 4 is exemplified. However, the working device F may be a threshing feed chain that sandwiches and conveys the cereal grains equipped in the combine as a work vehicle, and the work device F is equipped with the rush harvester as a work vehicle. It is good also as a structure which is an apparatus, or the structure which the working apparatus F is the lawn mower equipped with the lawn mower as a work vehicle.

(2) In the above embodiment, the switching operation motor M that performs the switching operation between the engaged state and the disconnected state of the threshing clutch 12 and the reaping clutch 10 and the switching operation between the rated rotation state and the idling state of the speed adjustment lever 42 is provided. Although the structure to provide was illustrated, it replaced with such a structure, the motor for clutch switching operation which performs switching operation of the threshing clutch 12 and the cutting clutch 10 in the on-state and a disengagement state, and the rated rotation state of the speed adjustment lever 42 A speed adjustment lever switching operation motor for performing a switching operation with an idling state may be provided separately, or a threshing clutch switching operation motor for each of the speed adjustment lever 42, the threshing clutch 12, and the reaping clutch 10. The configuration may include a mowing clutch switching operation motor and a speed adjustment lever switching operation motor.

(3) In the above-described embodiment, the traveling sub-transmission device D that can be switched between two steps of high and low is provided, and the control device H puts the speed adjustment lever 42 into the rated rotational state and the work clutch according to the command of the work mode command. When the auxiliary transmission D is switched to the high-speed shift state in the state in which C is operated to the on state, the switching operation is performed so that the speed adjustment lever 42 is in the rated rotation state and the work clutch C is in the disengaged state. In the state in which the motor M is operated and the control device H is switched to the high speed gear shifting state even if the work mode command is commanded by the mode command means G, Although the configuration in which the command is invalidated is illustrated, instead of such a configuration, a traveling auxiliary transmission device D that can be switched between a plurality of stages of high and low is provided, and the control device H is operated according to the command of the work mode command. In a state where the speed adjustment lever 42 is operated in the rated rotation state and the work clutch C is engaged, when the auxiliary transmission D is switched to the high speed side shift state, the speed adjustment lever 42 is set in the rated rotation state and the work clutch. In the state where the switching operation motor M is operated so that C is switched off, and the control device H is switched to the high speed side shifting state, the mode command means G Even if the previous work mode command is commanded at, the command may be invalidated.

(4) In the above-described embodiment, the push command type travel mode command operation switch 71, the travel stop mode command operation switch 72, and the cutting work command operation switch 74 that automatically return to the non-operation state as the mode command means G. In the threshing command operation switch 75, the travel stop mode command operation switch 72 is omitted, and the travel lamp 103 is provided in place of the travel mode command operation switch 71. However, the travel lamp 103 is further omitted. May be.

(5) In the above embodiment, while the cutting operation command operation switch 74 and the threshing command operation switch 75 are blinking, the cutting operation command operation switch 74 or the threshing command operation switch 75 is being pressed. Exemplifies a configuration in which the switching operation motor M is intermittently driven in forward and reverse rotations, but instead of such a configuration, the switching operation motor M is forward / reverse at a slower driving speed than in normal work. It may be configured to rotate.
(6) In the above-described embodiment, the sub transmission D for traveling that can be switched to a two-step shift state, a sub-transmission lever that switches the shift state of the sub-transmission D by operating in the front-rear direction, and the sub-transmission The configuration in which the sub-shift state output means 41 that outputs the shift state of D to the control device H is illustrated, but instead of such a configuration, the sub-shift for traveling that can be switched to a shift state of two steps of high and low A configuration may be provided in which a device D, a sub-shift switch that commands a shift command of the sub-transmission device D, and a control unit that performs a shift operation of the sub-transmission device D based on the shift command of the sub-transmission switch may be provided.

Overall side view of the combine in the first embodiment Schematic configuration diagram showing the transmission structure in the first embodiment Schematic configuration diagram showing the transmission structure in the first embodiment The left view of the interlocking operation part in 1st Embodiment The top view of the interlocking operation part in 1st Embodiment The right view of the interlocking operation part in 1st Embodiment The schematic block diagram which shows the interlocking operation part located in the driving | running | working stop position in 1st Embodiment. The schematic block diagram which shows the interlocking operation part located in the driving | running | working position in 1st Embodiment. Schematic block diagram which shows the interlocking operation part located in the threshing position in 1st Embodiment. The schematic block diagram which shows the interlocking operation part located in the cutting work position in 1st Embodiment. Control block diagram in the first embodiment The figure which shows the relationship between the speed change position and speed change output in 1st Embodiment. The figure which shows the operation position and speed ratio of the turning lever in 1st Embodiment. The figure which shows the lighting state of the switch in 1st Embodiment Flowchart of control operation in the first embodiment The figure which shows the lighting state of the switch in 2nd Embodiment The figure which shows the lighting state of the switch in 3rd Embodiment The figure which shows the lighting state of the switch in 4th Embodiment

1L, 1R traveling device 3 reaping processing device 4 threshing device 10 reaping clutch 12 threshing clutch 41 sub-shift state output means 42 accelerator means 76 main switch
69 Main shift lever 104 Work mode command operation switch C Work clutch D Sub-transmission E Engine F Work device G Mode command means H Control means M Switch operation drive means

Claims (11)

A traveling device and a working device driven by the output of the engine;
A work clutch that can be switched between an on state for transmitting the output of the engine to the working device and a cut-off state for interrupting transmission of the output of the engine to the working device;
A drive control device for a work vehicle provided with accelerator means capable of switching between a rated rotational state in which the engine is rotated at a set rated rotational speed and an idle state in which the engine is rotated at an idle rotational speed,
Switching operation drive means for performing a switching operation between the engaged state and the disengaged state of the work clutch and a switching operation between the rated rotation state and the idling state of the accelerator means;
Mode command means that can be manually operated in a state in which a work mode command is commanded regardless of an operation position of a main shift lever that shifts the travel device ;
When the operation mode command is instructed by the mode instruction unit, a control unit that operates the switching operation drive unit so that the accelerator unit is in the rated rotation state and the operation clutch is in the engaged state. A drive control device for a work vehicle provided. The mode command means is configured to be freely operable in a state in which a travel mode command is commanded,
When the travel mode command is instructed by the mode command unit, the control unit operates the switching operation drive unit so that the accelerator unit is in the rated rotation state and the work clutch is in the disengaged state. The drive control device for a work vehicle according to claim 1, wherein the drive control device is configured to cause the vehicle to operate. The mode command means is configured to be freely operable in a state of commanding a travel stop mode command,
When the travel stop mode command is instructed by the mode command means, the control means operates the switching operation drive means so as to place the accelerator means in the idling state and the work clutch in the disengaged state. The drive control device for a work vehicle according to claim 1 or 2, wherein the drive control device is configured to cause the work vehicle to be driven.   The working device is a threshing device equipped in a combine as a work vehicle, and the working clutch transmits an output of the engine to the threshing device and transmits an output of the engine to the threshing device. The drive control device for a work vehicle according to any one of claims 1 to 3, wherein the threshing clutch is switchable between a cut-off state and a cut-off state. The working device is a threshing device equipped with a combine as a work vehicle and a reaping processing device for reaping and supplying cereal husk to the threshing device, and the working clutch outputs the output of the engine to the threshing device. A threshing clutch that can be switched between an input state for transmission and a cut state that interrupts transmission of the output of the engine to the threshing device, and an input state for transmitting the output of the engine to the cutting processing device and the output of the engine 4. The work vehicle drive control device according to claim 1, wherein the work vehicle clutch is switchable to a cut-off state in which transmission to the cutting processing device is cut off. 5.   When the operation mode command is instructed by the mode command unit, the control unit sets the accelerator unit to a rated rotation state and sets the threshing clutch to the on state, and then sets the reaping clutch to the on state. 6. The drive control device for a work vehicle according to claim 5, wherein the drive means for switching operation is operated. The working device is a threshing device equipped with a combine as a work vehicle and a reaping processing device for reaping and supplying cereal husk to the threshing device, and the working clutch outputs the output of the engine to the threshing device. A threshing clutch that can be switched between an input state for transmission and a cut state that interrupts transmission of the output of the engine to the threshing device, and an input state for transmitting the output of the engine to the cutting processing device and the output of the engine A cutting clutch that can be switched to a cutting state that interrupts transmission to the cutting processing device,
Before Symbol mode instruction means is, as a condition for instructing the work mode instruction, is configured to be operable to select a state of directing the work order reaper a state of directing the threshing command,
When the threshing command is commanded by the mode commanding means, the control means places the accelerator means in the rated rotation state and the threshing clutch is engaged, and the mode commanding means commands the reaping work command. The work vehicle according to any one of claims 1 to 3, wherein the switching operation drive means is actuated so that the reaping clutch and the threshing clutch are engaged. Drive control device. The mode command means comprises a push-operation type work mode command operation switch that automatically returns to a non-operation state,
The control means determines that the mowing work command has been commanded when the work mode command operation switch is continuously pressed for a time shorter than the operation state determination setting time, and the work mode command operation The work vehicle drive control device according to claim 7, wherein when the switch is continuously pressed for a longer time than the operation state determination setting time, it is determined that the threshing command is instructed. A main switch is provided which can be switched to an off state in which the power circuit is turned off and an on state in which the power circuit is turned on.
When the main switch is switched from the off state to the on state, the control unit activates the switching operation driving unit so that the accelerator unit is in the idling state and the work clutch is disengaged. The drive control device for a work vehicle according to claim 1, configured as described above. A sub-transmission device for traveling that can be switched between a plurality of steps of high and low, and a sub-transmission state output means that outputs a shift state of the sub-transmission device to the control means;
In the state where the sub-transmission device is switched to the high speed side shifting state, the control means is configured to invalidate the command even if the mode command means commands the work mode command. The drive control device for a work vehicle according to any one of claims 1 to 9. And auxiliary change speed device switching 換自 standing traveling for the high and low a plurality of stages, and a secondary shifting state output means is provided for outputting a shifting state of the auxiliary speed change device to said control means,
Before SL control means, in a state of operating the accelerator means the state enters a and the working clutch to the rated rotational state by command of the work mode instruction, the when the auxiliary speed change device is switched to the transmission state of the high-speed side 11. The switching operation drive means is configured to operate so that the accelerator means is in the rated rotation state and the work clutch is in a disengaged state. Drive control device for work vehicles.

Images