JP2010178630A - Combined harvester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the travel safety of a combine harvester, which comprises a travel HST equipped with a variable displacement pump and a variable displacement motor in which the motor is changeable between a small displacement state and a large displacement state, on a hillside. <P>SOLUTION: The combine harvester has a constitution that when a controller judges that the angle of inclination of a machine body exceeds a specified value on the basis of a signal from an inclination sensor, only a manual operation signal from a travel mode change operation member, preferably a high-speed mode selection signal is ignored. In another embodiment, when the controller judges that the angle of inclination of the machine body exceeds a specified value on the basis of a signal from the inclination sensor, a travel mode change operation mechanism is forcedly operated so that the motor may turn into a large displacement state regardless of the manual operation signal from the travel mode change operation member. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a combine in which a traveling HST inserted in a traveling system transmission path from a driving source to a traveling device such as a crawler has a variable displacement traveling hydraulic pump and a variable displacement traveling hydraulic motor. About.

  A combine in which a traveling HST inserted in a traveling system transmission path includes a variable displacement hydraulic pump and a variable displacement hydraulic motor has been known (for example, see Patent Document 1 below).

Specifically, the pump-side volume adjustment mechanism of the hydraulic pump is configured to be operated based on an artificial operation to the main transmission operation member, and acts as a main transmission that continuously changes the traveling speed of the combine. ing.
On the other hand, the motor-side volume adjustment mechanism of the hydraulic motor selectively switches the hydraulic motor from a small volume state (high speed mode state) or a large volume state (low speed mode state) based on an artificial operation to the travel mode switching operation member. And is acting as a sub-transmission that changes the continuously variable transmission width of the main transmission.

  That is, the combine described in Patent Document 1 is configured so that the shift region (shift width) in the main transmission can be changed by the motor-side volume adjustment mechanism, and the combine is stopped while running. This is useful in that the driving mode can be smoothly switched between the low-speed mode and the high-speed mode.

  Furthermore, in the combine described in Patent Document 1, when the hydraulic motor is in a small volume state (high speed mode state), the control device controls so as not to operate the cutting unit. The clogging in the conveying unit and the threshing unit that can occur when the cutting operation is performed in the high-speed mode is prevented.

  As described above, the conventional combine is configured to control the operation of the mowing unit based on the operation state of the motor-side volume adjustment mechanism. However, for example, when the combine is loaded or unloaded on a truck, Even when the vehicle is traveling on a sloping ground where switching of the driving mode is not desirable, such as when the vehicle crosses, if the driver operates the driving mode switching operation member unexpectedly, the driving mode is switched. It was.

JP 2007-195490 A

  The present invention has been made in view of the prior art, and a traveling HST inserted in a traveling system transmission path includes a variable displacement traveling hydraulic pump and a variable displacement traveling hydraulic motor, and the traveling hydraulic pressure is An object of the present invention is to provide a combine that can improve traveling safety on an inclined ground in a combine in which the motor can be switched between a small volume state (high speed mode state) and a large volume state (low speed mode state).

  The present invention has been made in view of the prior art, and includes a variable displacement travel hydraulic pump operatively connected to a drive source and a variable displacement travel hydraulic motor fluidly connected to the travel hydraulic pump. An HST for driving, a main transmission operating member that can be manually operated, a main transmission operating mechanism that operates a traveling hydraulic pump side volume adjustment mechanism of the traveling hydraulic pump based on an artificial operation to the main transmission operating member; A travel mode switching operation member that can be manually operated, and a travel mode switching operation mechanism that switches the travel hydraulic motor to a small volume state or a large volume state via a travel hydraulic motor side volume adjustment mechanism of the travel hydraulic motor; A control for controlling the travel mode switching operation mechanism based on an artificial operation signal including a high speed mode selection signal and a low speed mode selection signal from the travel mode switching operation member. And a tilt sensor that detects a tilt angle of the fuselage, and the control device determines that the tilt angle of the fuselage exceeds a predetermined value based on a signal from the tilt sensor. In such a case, a combine configured to ignore an artificial operation signal from the travel mode switching operation member is provided.

  Preferably, the control device ignores only the high-speed mode selection signal from the traveling mode switching operation member when determining that the inclination angle of the airframe exceeds a predetermined value based on the signal from the inclination sensor. Can be configured as follows.

  The present invention also includes a variable displacement travel hydraulic pump operatively connected to a drive source, and a travel HST having a variable displacement travel hydraulic motor fluidly connected to the travel hydraulic pump. Main transmission operation member, a main transmission operation mechanism that operates a travel hydraulic pump side volume adjustment mechanism of the travel hydraulic pump based on a manual operation on the main transmission operation member, and a travel mode switching operation member that can be manually operated A travel mode switching operation mechanism for switching the travel hydraulic motor to a small volume state or a large volume state via a travel hydraulic motor side volume adjustment mechanism of the travel hydraulic motor, and a high speed from the travel mode switching operation member A combiner comprising: a control device for controlling the operation of the travel mode switching operation mechanism based on an artificial operation signal including a mode selection signal and a low speed mode selection signal; An inclination sensor that detects an inclination angle of the aircraft, and the control device determines that the inclination angle of the aircraft exceeds a predetermined value based on a signal from the inclination sensor; Provided is a combine for forcibly operating the travel mode switching operation mechanism so that the travel hydraulic motor is in a large volume state regardless of a human operation signal from a member.

  According to the combine according to the aspect of the present invention, when the inclination angle of the airframe exceeds a predetermined value, the volume of the traveling hydraulic motor cannot be changed based on the manual operation to the traveling mode switching operation member. Since the mode is not switched, the vehicle speed is prevented from changing suddenly even if the driver operates the travel mode switching operation member unexpectedly while traveling on an inclined ground. In addition, it is possible to improve driving safety during traveling on sloping ground such as when a combine is loaded onto a truck or over a ridge.

  If the tilt angle of the aircraft exceeds a predetermined value, only the high-speed mode selection signal from the travel mode switching operation member is ignored, so that the travel mode is changed from the low-speed mode to the high-speed mode while traveling on the slope. The transition from the high speed mode to the low speed mode can be performed by human operation while preventing the vehicle speed from increasing due to the transition.

  Further, according to the combine according to another aspect of the present invention, when the aircraft tilt angle exceeds a predetermined value, the traveling hydraulic motor is set in a large volume state and fixed in the low speed mode. Therefore, it is possible to prevent the switching of the driving mode against the intention, and to improve the driving safety.

FIG. 1 is a front view of a combine according to an embodiment of the present invention. FIG. 2 is a side view of the combine. FIG. 3 is a plan view of the combine. FIG. 4 is a transmission schematic diagram of the combine. FIG. 5 is a transmission schematic diagram of the transmission in the combine. FIG. 6 is a hydraulic circuit diagram of the transmission. FIG. 7 is a perspective view of the driver's seat in the combine. FIG. 8 is a perspective view of the vicinity of the main speed change operation member in the combine. FIG. 9 is a flowchart of an example of a control program stored in the control device in the combine. FIG. 10 is a flowchart of a modification of the control program.

Hereinafter, a combine according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
1 to 4 are a front view, a side view, a plan view, and a transmission schematic diagram of the combine 1 according to the present embodiment, respectively.

  As shown in FIGS. 1 to 4, the combine 1 includes an airframe 2, an engine 9 that acts as a drive source supported by the airframe 2, and a pair of left and right traveling devices connected to the airframe 2 (this embodiment). In this embodiment, a crawler type traveling device) 10, a transmission 100 that changes the rotational power from the engine 9 and outputs it to the pair of traveling devices 10, and a mowing that is supported in front of the machine body 2 so as to be movable up and down. A threshing process is performed on the device 30, the feed chain device 20 that conveys cereals harvested by the reaping device 30 backward on the left side of the machine body 2, and the cereals that are conveyed by the feed chain device 20. As described above, the threshing device 40 disposed in the left part of the machine body, the swing sorting device 50 disposed below the threshing apparatus 40, and the right front of the machine body 2 A driver's seat 5 disposed in the part, a Glen tank 6 for storing the grains selected by the swing sorting device 50, the Glen tank 6 disposed behind the driver's seat 5; It includes a waste transporting device 60 that inherits the drained waste from the feed chain device 20 and transports the waste to the rear.

First, the transmission path in the combine 1 will be described.
As shown in FIG. 4, the combine 1 includes a traveling system transmission path for transmitting rotational power from the engine 9 to the pair of traveling devices 10 via the transmission 100, and threshing rotational power from the engine 9. The threshing system transmission path that transmits to the feed chain device 20, the threshing device 40, the swing sorting device 50, and the waste transporting device 60 via the system pulley transmission mechanism 200, and the rotational power from the engine 9 is harvested. And a cutting system transmission path for transmission to the cutting device 30 via a system pulley transmission mechanism 250.

5 and 6 show a transmission schematic diagram and a hydraulic circuit diagram of the transmission 100, respectively.
As shown in FIGS. 5 and 6, the transmission 100 includes a traveling HST 120 and a turning HST 130 operatively connected to the engine 9, and a mechanical multi-stage that shifts rotational power from the traveling HST 120 in multiple stages. A transmission device 150, a pair of left and right first and second differential mechanisms 170a, 170b that combine the rotational power from the multi-stage transmission device 150 and the turning HST 130 and output to the pair of left and right output shafts 11, respectively; A traveling system transmission mechanism 180 that transmits rotational power from the multi-stage transmission 150 to the first and second differential mechanisms 170a and 170b in the same rotational direction, and rotational power from the turning HST 130 to the first and second differential mechanisms 170a and 170b. 2 A rotating transmission mechanism 190 that transmits to one of the differential mechanisms 170a and 170b in the forward direction and transmits to the other in the reverse direction. It has.

  As shown in FIGS. 5 and 6, the travel HST 120 includes a variable displacement travel hydraulic pump 120P operatively connected to the engine 9, and a variable volume fluidly driven by the travel hydraulic pump 120P. And a traveling hydraulic motor 120M.

The variable displacement travel hydraulic pump 120P includes a travel pump shaft 121 operatively connected to the engine 9, a travel hydraulic pump main body 122 supported by the travel pump shaft 121 so as not to be relatively rotatable, A traveling hydraulic pump side volume adjusting mechanism 123 that changes the volume of the traveling hydraulic pump main body 122 is provided.
In the present embodiment, the traveling hydraulic pump side volume adjusting mechanism 123 includes a traveling hydraulic pump side movable swash plate, a traveling hydraulic pump side control shaft that tilts the traveling hydraulic pump side movable swash plate, and have.

The traveling hydraulic pump side volume adjusting mechanism 123 is configured to change the volume of the traveling hydraulic pump main body 122 based on an artificial operation on the main transmission operation member 310.
Specifically, the combine 1 includes the main transmission operation member 310 that can be manually operated, and a main transmission operation mechanism 320 that operates the travel hydraulic pump-side volume adjustment mechanism 123 based on an artificial operation on the main transmission operation member 310. And.

FIG. 7 shows a perspective view of the driver seat 5.
As shown in FIG. 7, a side column 8 is provided on one side of the driver's seat 5, and the main transmission operation member 310 is guided by a lever guide provided on the side column 8. It can be swung around the operation axis along the vehicle width direction.

FIG. 8 is a perspective view of the vicinity of the main speed change operation member 310.
Specifically, the main speed change operation member 310 includes a lever rod 311 inserted through the lever guide and a grip portion 312 provided at an upper end portion of the lever rod 311.
In the present embodiment, the main speed change operation member 310 has other functions provided in the combine 1 in addition to the main speed change operation for changing the operating state of the travel hydraulic pump side volume adjusting mechanism 123. It is comprised so that it can operate.

  Specifically, the main speed change operation member 310 includes a machine body inclination switch 313 for operating the following pair of left and right machine body lifting / lowering hydraulic devices 562a and 562b, and a cutting machine for operating the following cutting lifting / lowering hydraulic device 561. The lifting / lowering switch 314, the handling depth switch 315 for adjusting the tip position of the harvested grain pod with respect to the handling cylinder in the threshing device 40, and the harvesting lifting / lowering hydraulic device 561, A reaping device auto-lift switch 316 for raising to a working position, a reaping device auto-set switch 317 for automatically setting the reaping device 30 to a predetermined working position by the reaping / lifting hydraulic device 561, and the traveling hydraulic pressure A traveling mode switching operation member 318 for selectively setting the motor 120M to a small volume state or a large volume state is attached.

  In the present embodiment, the main transmission operation mechanism 320 is controlled by the control device 400 provided in the combine 1 based on an artificial operation on the main transmission operation member 310.

  That is, as shown in FIG. 6, the combine 1 further determines the tilt position of the operation-side main transmission sensor 410 that detects the operation position of the main transmission operation member 310 and the traveling hydraulic pump-side movable swash plate. An operation-side main transmission sensor 415 that detects directly or indirectly, and the control device 400 controls the main transmission operation mechanism based on signals from the operation-side main transmission sensor 410 and the operation-side main transmission sensor 415. 320 is configured to perform operation control.

  As shown in FIG. 6, the main transmission operating mechanism 320 includes a traveling hydraulic pump side piston device 321 and a traveling hydraulic pump side solenoid valve that switches supply and discharge of hydraulic oil to and from the traveling hydraulic pump side piston device 321. 322.

  In such a configuration, the control device 400 controls the position of the traveling hydraulic pump side electromagnetic valve 322 based on signals from the operation side main transmission sensor 410 and the operation side main transmission sensor 415, thereby The traveling hydraulic pump side piston device 321 positions the traveling hydraulic pump side movable swash plate at a tilt position corresponding to the operation position of the main transmission operation member 310 via the control shaft.

  As shown in FIG. 6, the hydraulic oil of the traveling hydraulic pump side piston device 320 is supplied from a first auxiliary pump 501 provided in the combine 1 as a charge oil source for the traveling HST 120 and the turning HST 130. .

  When a rotation angle sensor is used as the operation-side main transmission sensor 410, the control device 400 stores a neutral position of the main transmission operation member 310 as an initial value and uses the main value as a reference. Each time the speed change operation member 310 is operated, the operation direction and the operation angle are accumulated, so that the operation position of the main speed change operation member 310 at that time can be recognized.

In the present embodiment, the main transmission operating mechanism 320 is configured to operate the travel hydraulic pump side volume adjusting mechanism 123 using the hydraulic pressure of hydraulic oil that is supplied and discharged by the electromagnetic valve 322. However, instead of this, it is also possible to employ an electric motor.
Further, instead of the configuration in which the operation is electrically controlled by the control device 400 such as a combination of the piston device 321 and the electromagnetic valve 322 or the electric motor, the main transmission operation member 310 and the traveling hydraulic pump are used. The main transmission operating mechanism 320 can be formed by a mechanical link mechanism that operatively connects the side volume adjusting mechanism 123.

The variable displacement travel hydraulic motor 120M is a travel hydraulic motor fluidly connected to the travel hydraulic pump main body 122 via a pair of first and second travel side HST lines 129a and 129b (see FIG. 6). A main body 127, a travel motor shaft 126 that supports the travel hydraulic motor main body 127 so as not to be relatively rotatable, and a travel hydraulic motor side volume adjustment mechanism 128 that changes the volume of the travel hydraulic motor main body 127 are provided. ing.
In the present embodiment, the travel hydraulic motor side volume adjusting mechanism 128 has a travel hydraulic motor side movable swash plate and a travel hydraulic motor side control shaft that tilts the travel motor side movable swash plate. is doing.

  The travel hydraulic motor side volume adjustment mechanism 128 is configured to allow the travel hydraulic motor main body 127 to have a small volume and a large volume based on a manual operation on the travel mode switching operation member 318. ing.

  Specifically, as shown in FIG. 6, the combine 1 includes the travel mode switching operation member 318 that can be manually operated, and a travel mode switching operation mechanism 330 that operates the travel hydraulic motor side volume adjustment mechanism 128. The control device 400 selectively controls the travel hydraulic motor 120M in a small volume state by performing operation control of the travel mode switching operation mechanism 330 based on an artificial operation on the travel mode switching operation member 318. It is comprised so that it may be set as a large volume state.

As described above, in the present embodiment, the travel mode switching operation member 318 is attached to the grip portion 312 of the main transmission operation member 310 (see FIG. 8).
The travel mode switching operation member 318 is configured to output a high-speed mode selection signal (small volume selection signal) or a low-speed mode selection signal (large volume selection signal) to the control device 400 in accordance with an artificial operation.

  As shown in FIG. 6, the traveling mode switching operation mechanism 330 supplies and discharges hydraulic oil from the traveling hydraulic motor side piston device 331 and from the first auxiliary pump 501 to the traveling hydraulic motor side piston device 331. A traveling hydraulic motor side electromagnetic valve 332 for switching is provided.

  The control device 400 controls the position of the electromagnetic valve 332 in accordance with a travel mode selection signal from the travel mode switching operation member 318, whereby the travel hydraulic motor side piston device 331 is controlled by the travel hydraulic motor. The traveling hydraulic motor 120M is brought into a small volume state or a large volume state via a side volume adjusting mechanism 128.

That is, when the piston rod of the traveling hydraulic motor side piston device 331 is pushed to one side in the axial direction by the hydraulic oil that is supplied and discharged by the electromagnetic valve 332, the traveling hydraulic motor side control shaft passes through the traveling hydraulic motor side control shaft. The traveling hydraulic motor side movable swash plate is positioned at a small volume position on the neutral side around the swing axis, and thereby the traveling hydraulic motor 120M enters a small volume state where high speed rotation output is performed.
On the other hand, when the piston rod is pushed to the other side in the axial direction by the hydraulic oil that is supplied and discharged by the electromagnetic valve 332, the traveling hydraulic motor side movable swash plate is moved through the traveling hydraulic motor side control shaft. It is located at a large volume position on the opposite side to the neutral side around the swing axis, whereby the traveling hydraulic motor 120M enters a large volume state in which low-speed rotation output is performed.

In the present embodiment, the travel mode switching operation member 318 is configured to sequentially output a high speed mode selection signal and a low speed mode selection signal each time it is pressed. That is, in the initial state where the engine 9 of the combine 1 is started, the control device 400 operates the travel mode switching operation mechanism 330 so that the travel hydraulic motor 120M is in a large volume state. When the travel mode switching operation member 318 is operated from this initial state, a high speed mode selection signal is transmitted from the travel mode switching operation member 318 to the control device 400, whereby the control device 400 The travel mode switching operation mechanism 330 is operated so that the travel hydraulic motor 120M is in a small volume state. Furthermore, when the travel mode switching operation member 318 is operated from this state, a low speed mode selection signal is transmitted from the travel mode switching operation member 318 to the control device 400, whereby the control device 400 causes the travel device to switch the travel mode switching operation member 318. The travel mode switching operation mechanism 330 is operated so that the hydraulic motor 120M is in a large capacity state.
Of course, instead of such a configuration, the travel mode switching operation member 318 may be a toggle switch or a seesaw switch.

  In the present embodiment, the travel mode switching operation mechanism 330 is configured to operate the travel hydraulic motor side volume adjustment mechanism 128 by utilizing the action of hydraulic pressure. It is also possible to employ an electric motor.

  5 and 6, the turning HST 130 includes a turning hydraulic pump 130P operatively connected to the engine 9, and a turning hydraulic motor 130M fluidly driven by the turning hydraulic pump 130P. It has.

At least one of the turning hydraulic pump 130P and the turning hydraulic motor 130M is a variable displacement type.
In this embodiment, as shown in FIGS. 5 and 6, the turning hydraulic pump 130P is a variable displacement type, and the turning hydraulic motor 130M is a fixed displacement type.

The variable displacement type hydraulic pump 130P for turning includes a turning pump shaft 131 operatively connected to the engine 9, a turning hydraulic pump main body 132 supported by the turning pump shaft 131 so as not to be relatively rotatable, A turning hydraulic pump side volume adjusting mechanism 133 that changes the volume of the turning hydraulic pump main body 132 is provided.
In the present embodiment, the turning hydraulic pump side volume adjusting mechanism 133 includes a turning hydraulic pump side movable swash plate, and a turning hydraulic pump side control shaft for tilting the turning hydraulic pump side movable swash plate. have.

  The fixed displacement type hydraulic motor 130M for turning includes a turning hydraulic motor main body 137 fluidly connected to the turning hydraulic pump main body 132 via a pair of turning-side first and second HST lines 139a, 139b, and the turning A turning motor shaft 136 that supports the hydraulic motor main body 137 in a relatively non-rotatable manner, and a fixed swash plate (not shown) that fixes the volume of the turning hydraulic motor main body 137.

  The turning hydraulic pump side volume adjusting mechanism 133 is configured to change the volume of the turning hydraulic pump 130P based on a manual operation on the turning operation member 350 such as a steering handle.

  Specifically, as shown in FIGS. 6 and 7, the combine 1 includes the turning operation member 350 that can be manually operated, and the turning hydraulic pump side volume adjustment mechanism 133 based on the artificial operation to the turning operation member 350. And a turning operation mechanism 360 for operating the device.

  In the present embodiment, the turning operation mechanism 360 is controlled by the control device 400 based on an artificial operation on the turning operation member 350.

  That is, as shown in FIG. 6, the combine 1 further directly or directly sets the tilt position of the operation side turning sensor 420 for detecting the operation position of the turning operation member 350 and the turning hydraulic pump side movable swash plate. And an operation side turning sensor 425 that detects indirectly, and the control device 400 controls the operation of the turning operation mechanism 360 based on signals from the operation side turning sensor 420 and the operation side turning sensor 425. It is configured as follows.

  As shown in FIG. 6, the turning operation mechanism 360 is a turning hydraulic pump side piston device 361 and a turning operation for switching supply and discharge of hydraulic oil from the first auxiliary pump 501 to the turning hydraulic pump side piston device 361. And a hydraulic pump side electromagnetic valve 362.

  In such a configuration, the control device 400 controls the position of the turning hydraulic pump side electromagnetic valve 362 based on signals from the operation side turning sensor 420 and the operation side turning sensor 425, thereby The hydraulic pump side piston device 361 is configured to position the turning hydraulic pump side movable swash plate at a tilt position corresponding to the operation position of the turning operation member 350 via the control shaft.

  When a rotation angle sensor is used as the operation-side turning sensor 420, the control device 400 stores the rectilinear position of the turning operation member 350 as an initial value, and the turning operation member based on the initial value. Each time the 350 is operated, the operation direction and the operation angle are accumulated, so that the operation position of the turning operation member 350 at that time can be recognized.

In the present embodiment, the turning operation mechanism 360 is configured to operate the turning hydraulic pump side volume adjustment mechanism 133 using the hydraulic pressure of hydraulic oil that is supplied and discharged by the electromagnetic valve 362. However, instead of this, it is also possible to employ an electric motor.
Further, instead of the combination of the piston device 361 and the electromagnetic valve 362 or the configuration in which the operation is electrically controlled by the control device 400 such as the electric motor, the turning operation member 350 and the turning hydraulic pump side It is also possible to form the turning operation mechanism 360 by a mechanical link mechanism that operatively connects the volume adjustment mechanism 133.

  The multi-stage transmission 150 has at least a low-speed shift stage and a standard shift stage, and multi-speed-shifts the rotational power from the traveling HST 120 toward the pair of first and second differential mechanisms 170a and 170b. Output.

  Specifically, as shown in FIG. 5, the multi-stage transmission 150 includes the drive shaft 151 operatively connected to the travel motor shaft 126 and the first and second differentials via the travel system transmission mechanism 180. A driven shaft 152 operatively connected to the mechanisms 170a and 170b, a low-speed gear train 153a and a standard gear train 153b supported by the drive shaft 151 and the driven shaft 152, and the low-speed gear train 153a and the standard gear train 153b. And a switching shifter 154 for bringing any one of the gear trains into a transmission state.

In the present embodiment, as shown in FIG. 5, the multi-stage transmission 150 has a high-speed gear train 153c in addition to the low-speed gear train 153a and the standard gear train 153b, and performs three-speed gear shifting. It is configured to do so.
Therefore, the switching shifter 154 has a low-speed position where the low-speed gear train 153a is in a transmission state, a standard position where the standard gear train 153b is in a transmission state, and a neutral position where both the gear trains 153a and 153b are in a power-off state. A low-speed / standard switching shifter 154a that can be selectively used, and a high-speed switching shifter 154b that selectively places the high-speed gear train 153c in a transmission state or a power cut-off state.

The multi-stage speed change device 150 is configured to perform a speed change operation based on a manual operation on the sub-speed change operation member 370.
That is, the combine 1 is a sub-shift operation member 370 (see FIGS. 7 and 8) that can be manually operated and a sub-switch that switches the transmission state of the multi-stage transmission 150 based on the manual operation on the sub-transmission operation member 370. And a shift operating mechanism (not shown).

The auxiliary transmission operating mechanism operates one of the low-speed gear train 153a, the standard gear train 153b, and the high-speed gear train 153c by operating the switching shifter 154 based on an artificial operation on the auxiliary transmission operation member 370. As long as the gear train can be in a transmission state, various forms can be taken.
That is, a mechanical link mechanism can be employed as the auxiliary transmission operation mechanism, and a combination of a hydraulic piston and electromagnetic valve that can be electrically controlled by the control device 400 or an electric motor can be employed. It is.

  As shown in FIG. 5, each of the first and second differential mechanisms 170 a and 170 b has a sun gear 171 and a planet gear 172 meshed with the sun gear 171 so as to revolve around the sun gear 171. The first to third elements including a carrier 173 that revolves around the sun gear 171 together with the planetary gear 172 and an internal gear 174 that meshes with the planetary gear 172 are provided.

As shown in FIG. 5, the traveling transmission mechanism 180 transmits rotational power from the multi-stage transmission 150 to the first elements of the first and second differential mechanisms 170a and 170b in the same direction.
As shown in FIG. 5, the turning transmission mechanism 190 transmits the rotational power from the turning HST 130 to the second elements of the first and second differential mechanisms 170a and 170b in opposite directions. Yes.
The first and second differential mechanisms 170a and 170b combine the rotational powers of the first and second elements, respectively, and transmit the combined rotational power from the third element to the corresponding output shaft 11. Output.
In the present embodiment, the sun gear 171, the internal gear 174, and the carrier 173 act as the first element, the second element, and the third element, respectively.

  In the present embodiment, as shown in FIG. 5, the transmission 1 further includes a traveling brake device 140 that can operatively apply a braking force to the driven shaft 152 of the multi-stage transmission 150, The turning-side brake device 145 capable of operatively applying a braking force to the turning motor shaft 136 and the power transmission from the turning motor shaft 136 to the first and second differential mechanisms 170a and 170b are disconnected. And a turning-side clutch device 146.

As shown in FIG. 4, a threshing clutch 210 is inserted in the threshing pulley transmission mechanism 200.
The threshing clutch 210 is configured to be operated and controlled based on an artificial operation on a work clutch lever 380 (see FIGS. 7 and 8) disposed in the vicinity of the driver's seat 5.

In the present embodiment, the threshing clutch 210 is controlled by the control device 400 based on an artificial operation on the work clutch lever 380.
Specifically, as shown in FIG. 6, the combine 1 has a threshing clutch operating mechanism 510 that is controlled by the control device 400.

  As shown in FIG. 6, the threshing clutch operating mechanism 510 includes a threshing clutch piston device 511, and a threshing clutch electromagnetic that switches supply and discharge of hydraulic oil from the first auxiliary pump 501 to the threshing clutch piston device 511. And a valve 512.

  In such a configuration, the control device 400 controls the position of the threshing clutch electromagnetic valve 512 according to the operation position of the work clutch lever 380, whereby the threshing clutch piston device 511 is controlled by the threshing clutch 210. The power transmission by is selectively engaged or interrupted.

  As shown in FIG. 4, the reaping pulley transmission mechanism 250 transmits a rotational power having a rotational speed synchronized with the vehicle speed to the reaping device 30, and the pulsating pulley transmission mechanism 260 from the engine 9. A constant speed side cutting system pulley transmission mechanism 270 that transmits constant speed rotational power to the cutting device 30.

  The vehicle speed tuning side reaping pulley transmission mechanism 260 is configured to operatively extract rotational power from the traveling motor shaft 126 of the traveling HST 120 and transmit it to the reaping device 30 as shown in FIG. Has been.

As shown in FIG. 4, a vehicle speed tuning side reaping system pulley transmission mechanism 260 is inserted with a vehicle speed tuning side reaping clutch 265.
The vehicle speed tuning side cutting clutch 265 is controlled to operate based on a manual operation to the work clutch lever 380.
That is, the working clutch lever 380 acts as an operating member for both the threshing clutch 210 and the vehicle speed tuning side cutting clutch 265.

In the present embodiment, the vehicle speed tuning side harvesting clutch 265 is controlled by the control device 400 based on a manual operation on the work clutch lever 380.
Specifically, as shown in FIG. 6, the combine 1 has a vehicle speed tuning side harvesting clutch operating mechanism 520 that is controlled by the control device 400.

  As shown in FIG. 6, the vehicle speed tuning side harvesting clutch operating mechanism 520 includes a hydraulic fluid from the vehicle speed tuning side cutting clutch piston device 521 and the first auxiliary pump 501 to the vehicle speed tuning side cutting clutch piston device 521. And a vehicle speed tuning side cutting clutch electromagnetic valve 522 for switching between supply and discharge of the vehicle.

  In such a configuration, the control device 400 controls the position of the vehicle speed tuning side trimming clutch electromagnetic valve 522 in accordance with the operating position of the work clutch lever 380, and thereby the vehicle speed tuning side trimming clutch piston device. Reference numeral 521 selectively engages or interrupts power transmission by the vehicle speed tuning side cutting clutch 365.

As shown in FIG. 4, the constant speed side reaping pulley transmission mechanism 270 is configured to take out constant speed rotational power from the threshing pulley transmission mechanism 200 and transmit it to the reaping device 300.
Specifically, the constant speed side reaping pulley transmission mechanism 270 takes out constant speed rotational power from the threshing pulley transmission mechanism 200 on the downstream side in the transmission direction from the threshing clutch 210.

As shown in FIG. 4, a constant speed side reaping clutch 275 is interposed in the constant speed side reaping pulley transmission mechanism 270.
The constant speed side harvesting clutch 275 is controlled based on a manual operation on a constant speed side harvesting clutch operating member (not shown) such as a clutch pedal disposed in the vicinity of the driver's seat 5.

In the present embodiment, the constant speed side reaping clutch 275 is controlled by the control device 400 based on an artificial operation on the constant speed side reaping clutch operating member.
Specifically, as shown in FIG. 6, the combine 1 has a constant speed side cutting clutch operating mechanism 530 that is controlled by the control device 400.

  As shown in FIG. 6, the constant speed side reaping clutch operating mechanism 530 is a hydraulic oil from the constant speed side reaping clutch piston device 531 and the first auxiliary pump 501 to the constant speed side reaping clutch piston device 531. And a constant speed side cutting clutch electromagnetic valve 532 for switching the supply and discharge of the.

  In such a configuration, the control device 400 controls the position of the constant speed side harvesting clutch electromagnetic valve 532 according to the operating position of the constant speed side harvesting clutch operating member, thereby the constant speed side harvesting clutch. The piston device 531 selectively engages or interrupts power transmission by the constant speed side cutting clutch 275.

  As shown in FIG. 6, the combine 1 includes a pair of left and right body lifts that lift and lower the left and right sides of the machine body 2 independently. Hydraulic devices 562a and 562b, an auger operating hydraulic device 563 for operating an auger attached to the Glen tank 6, and a second auxiliary pump 502 acting as a hydraulic source of hydraulic oil for these hydraulic devices. I have.

  As described above, the control device 400 performs the operation control of the travel mode switching operation mechanism 330 based on the manual operation signal from the travel mode switching operation member 318, and selectively sets the travel hydraulic motor 120M to a small volume. In the combine 1 according to the present embodiment, in addition to this, when the machine body 2 is inclined beyond a predetermined angle, the traveling is performed. An artificial operation signal from the mode switching operation member 318 is configured to be ignored.

Specifically, as shown in FIG. 6, the combine 1 includes an inclination sensor 430 that detects an inclination angle of the machine body 2.
The control device 400 includes a CPU that executes arithmetic processing and a storage unit that stores a control program 401 described later, and inputs signals from the travel mode switching operation member 318 and the tilt sensor 430 to input the signal. A control signal is output to the travel mode switching operation mechanism 330 based on the control program 401.

FIG. 9 shows a flowchart of the control program 401 stored in the control device 400.
The control program 401 starts when the engine 9 starts to be driven.
The control device 400 controls the travel mode switching operation mechanism 330 in the low speed mode so that the travel hydraulic motor 120M is in a large capacity state in the initial state (that is, the combine 1 is in the low speed mode). A signal is output (step 10).

  In step 11, the control device 400 determines whether or not an artificial operation signal for selecting the low speed mode is input from the travel mode switching operation member 318.

  In the case of YES in Step 11 (that is, when the low speed mode selection signal is input from the travel mode switching operation member 318), the control device 400 is based on the signal from the tilt sensor 430 in Step 12. It is determined whether the inclination angle of the airframe 2 is within a predetermined angle.

If YES in step 12 (that is, if the body 2 is within a predetermined tilt angle), the control device 400 outputs a low speed mode control signal to the travel mode switching operation mechanism 330 in step 13, Thus, the traveling hydraulic motor 120M is in a small volume state, and the combine 1 is in the low speed mode.
Thereafter, in step 14, it is determined whether or not the engine 9 has been stopped. If NO, the process returns to step 11, and if YES, the control program 401 ends.

  In the case of NO in step 12 (that is, when the airframe 2 is inclined beyond a predetermined inclination angle), the control device 400 bypasses step 13 and proceeds to step 14.

  If NO in step 11, the control device 400 determines in step 21 whether or not an artificial operation signal for selecting the high speed mode is input from the travel mode switching operation member 318.

If NO in step 21, the control device 400 proceeds to step 14.
In the case of YES in step 21 (that is, when the high speed mode selection signal is input from the travel mode switching operation member 318), the control device 400 is based on the signal from the tilt sensor 430 in step 22. It is determined whether the inclination angle of the airframe 2 is within a predetermined angle.

  If YES in step 22 (that is, if the body 2 is within a predetermined inclination angle), the control device 400 outputs a high-speed mode control signal to the travel mode switching operation mechanism 330 in step 23. Thus, the traveling hydraulic motor 120M is in a small volume state, and the combine 1 is in the high speed mode.

  If NO in step 22 (that is, if the airframe 2 is tilted beyond a predetermined tilt angle), the control device 400 bypasses step 23 and proceeds to step 14.

As described above, in the combine 1 according to the present embodiment, when it is determined that the inclination angle of the airframe 2 exceeds a predetermined value, the control device 400 receives the travel mode switching operation member 318 from the travel mode switching operation member 318. It is configured to ignore the artificial operation signal.
Therefore, when the operator operates the travel mode switching operation member 318 against the intention of traveling on an inclined ground where switching of the travel mode is not preferable, such as when the combine 1 is loaded onto the truck or over the ridge, etc. Even so, it is possible to prevent the traveling speed of the combine 1 from changing unexpectedly, thereby improving the traveling safety on slopes.

In the present embodiment, the control device 400 is configured to ignore all the human operation signals from the travel mode switching operation member 318 when the airframe 2 exceeds a predetermined inclination angle. However, instead of this, only the high-speed mode selection signal can be ignored.
That is, step 12 can be omitted in the flowchart shown in FIG.

  In such a configuration, when the airframe 2 exceeds a predetermined inclination angle, the high-speed mode by human operation is prevented while the low-speed mode is shifted to the high-speed mode (that is, the vehicle speed is increased). To the low speed mode (that is, deceleration of the vehicle speed) can be allowed.

FIG. 10 shows a flowchart of a modification 402 of the control program.
The control program 402 starts when the engine 9 starts to be driven.
The control device 400 controls the travel mode switching operation mechanism 330 in the low speed mode so that the travel hydraulic motor 120M is in a large capacity state in the initial state (that is, the combine 1 is in the low speed mode). A signal is output (step 30).

  In step 31, the control device 400 determines whether or not the tilt angle of the airframe 2 is within a predetermined angle based on a signal from the tilt sensor 430.

  First, the case where the answer is YES in step 31 (that is, the case where the body 2 is within a predetermined inclination angle) will be described.

  When the airframe 2 is within a predetermined inclination angle, the control device 400 determines in step 32 whether or not an artificial operation signal for selecting the low speed mode is input from the travel mode switching operation member 318.

In the case of YES in step 32 (that is, when the low speed mode selection signal is input from the travel mode switching operation member 318), the control device 400 causes the travel mode switching operation mechanism 330 to perform a low speed operation in step 33. A mode control signal is output, whereby the traveling hydraulic motor 120M is in a large volume state and the combine 1 is in the low speed mode.
Thereafter, in step 34, it is determined whether or not the engine 9 has been stopped. If NO, the process returns to step 31. If YES, the control program 402 ends.

  If NO in step 32, the control device 400 determines in step 41 whether or not an artificial operation signal for selecting the high speed mode is input from the travel mode switching operation member 318.

In the case of YES in step 41 (that is, when the high-speed mode selection signal is input from the travel mode switching operation member 318), the control device 400 sends the travel mode switching operation mechanism 330 to the high-speed mode in step 42. A mode control signal is output, whereby the traveling hydraulic motor 120M is in a small volume state, and the combine 1 is in the high speed mode.
Thereafter, in step 34, it is determined whether or not the engine 9 has been stopped. If NO, the process returns to step 31. If YES, the control program 402 ends.
If NO in step 41, the control device 400 proceeds to step 34.

Next, the case where the determination in step 31 is NO (that is, the case where the airframe 2 exceeds a predetermined inclination angle) will be described.
When the airframe 2 exceeds the predetermined inclination angle, the control device 400 bypasses step 32 and proceeds to step 33.

  That is, in the combine including the control program 402 according to the modified example, when the inclination angle of the airframe 2 exceeds a predetermined value, the control device 400 receives the manipulation from the travel mode switching operation member 318. Regardless of the operation signal, the traveling mode switching operation mechanism 330 is forcibly operated so that the traveling hydraulic motor 120M is in a large volume state.

  According to such a configuration, when the inclination angle of the combine exceeds a predetermined value, the traveling hydraulic motor 120M is fixed in a large volume state. It can be surely prevented from switching.

1 Combine 9 engine (drive source)
120 HST for driving
120P Travel hydraulic pump 123 Travel hydraulic pump side volume adjustment mechanism 120M Travel hydraulic motor 128 Travel hydraulic motor side volume adjustment mechanism 310 Main transmission operation member 318 Travel mode switching operation member 320 Main transmission operation mechanism 330 Travel mode switching operation mechanism 400 Controller 430 Tilt sensor

Claims (3)

A travel HST having a variable displacement travel hydraulic pump operatively connected to a drive source, a variable displacement travel hydraulic motor fluidly connected to the travel hydraulic pump, and a manipulable main transmission operation member; A main transmission operating mechanism that operates a traveling hydraulic pump-side volume adjustment mechanism of the traveling hydraulic pump based on a manual operation on the main transmission operating member, a traveling mode switching operation member that can be manually operated, and the traveling hydraulic pressure A travel mode switching operation mechanism for switching the travel hydraulic motor to a small volume state or a large volume state via a travel hydraulic motor side volume adjustment mechanism of the motor, a high speed mode selection signal and a low speed mode from the travel mode switching operation member A combine comprising a control device for controlling the operation of the travel mode switching operation mechanism based on an artificial operation signal including a selection signal,
An inclination sensor for detecting an inclination angle of the airframe;
The control device is configured to ignore an artificial operation signal from the travel mode switching operation member when determining that the inclination angle of the airframe exceeds a predetermined value based on a signal from the inclination sensor. Combine that is characterized by being.   The control device is configured to ignore only the high-speed mode selection signal from the travel mode switching operation member when determining that the tilt angle of the airframe exceeds a predetermined value based on the signal from the tilt sensor. The combine according to claim 1, wherein A travel HST having a variable displacement travel hydraulic pump operatively connected to a drive source, a variable displacement travel hydraulic motor fluidly connected to the travel hydraulic pump, and a manipulable main transmission operation member; A main transmission operating mechanism that operates a traveling hydraulic pump-side volume adjustment mechanism of the traveling hydraulic pump based on a manual operation on the main transmission operating member, a traveling mode switching operation member that can be manually operated, and the traveling hydraulic pressure A travel mode switching operation mechanism for switching the travel hydraulic motor to a small volume state or a large volume state via a travel hydraulic motor side volume adjustment mechanism of the motor, a high speed mode selection signal and a low speed mode from the travel mode switching operation member A combine comprising a control device for controlling the operation of the travel mode switching operation mechanism based on an artificial operation signal including a selection signal,
An inclination sensor for detecting an inclination angle of the airframe;
When the control device determines that the tilt angle of the airframe exceeds a predetermined value based on the signal from the tilt sensor, the control device does not depend on the manual operation signal from the travel mode switching operation member. The combine characterized by forcibly operating the travel mode switching operation mechanism so that the hydraulic motor is in a large volume state.

Images