JPS6347418B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a control mechanism that automatically increases/decelerates a manually operable traveling transmission so that the threshing load is approximately constant based on information from a threshing load detection device. The present invention relates to a combine harvester provided with an operating tool for changing and setting the speed, switching the control mechanism between an operating state and a non-actuating state in accordance with a series of displacements, and changing and setting the maximum speed.

The above-mentioned combine harvester has a single operation for switching between automatic speed change running and manual speed change driving, and changing and setting the maximum speed that appears during automatic speed change travel according to the planting situation of grain culms and the operator's wishes. Although it has been designed to be easy to operate using the operating tools, conventional methods have had the disadvantage that when operating the operating tools, the aircraft vibrates, making the operator feel uncomfortable and causing vibrations. Ta. This is because, as shown in FIGS. 5 and 7, for example, the operating position of the operating tool 39 is configured such that the maximum speed of shifting by the control mechanism increases as the control mechanism becomes inactive, the position MAN. In the case where manual driving is performed at a speed Va higher than the first speed V ₁ of the maximum speed shifting speed, the maximum speed shifting speed is set to the second speed V ₂ at the same time as switching to automatic shifting driving, and the automatic If the speed to be produced by the control mechanism when switching to variable speed travel corresponds to a speed Vb higher than the travel speed Va before switching, the operating tool 39 changes from the manual travel position MAN to the second speed V. Since a signal indicating that the vehicle should be set to the first speed V ₁ is input while the vehicle is being operated to the operation position ₂ , the vehicle speed is increased from speed Va to Vb once toward speed V ₁ . This is because the speed is decelerated, and conversely, the operating tool is in second gear.
If the vehicle is set to an operating position of V ₂ or higher and is running with an automatic transmission and the vehicle speed is higher than the first speed V ₁ and the vehicle is switched to manual transmission, the operating tool 39 is operated to the manual traveling position MAN. The first thing to do when
This is because the vehicle speed is once decelerated toward speed V ₁ by the control mechanism after passing through the operating position of speed V ₁ .

In view of the above-mentioned circumstances, it is an object of the present invention to eliminate the above-mentioned drawbacks by making it possible to prevent unequal speed changes caused by the control mechanism that occur when switching between manual speed change driving and automatic speed change driving.

Next, embodiments of the combine harvester of the present invention will be described in detail based on illustrative drawings.

As shown in Fig. 1, a device 1 for raising grain culms such as rice and wheat planted in a field, a cutting blade 2 for cutting the base of the raised grain culms, and a device 3 for carrying the harvested grain culms rearward by pinching them. The conveyed grain culm is held and conveyed by the feed chain 4 while being handled by the rotary handling drum 5, and the processed material is subjected to the blowing action of the winch 6 and the swinging sorting plate 7.
A threshing device 10 that performs a sorting process to collect fine grains by falling into a first port 8, collecting second particles by falling into a second port 9, and discharging straw waste from the device by the feeding action of the threshing device 10;
Each of the disc-shaped cutters 12 for shredding the threshed waste straw transported by the waste straw chain 11 is installed in a self-propelled machine having a crawler traveling device 13, an engine 14 for driving the various devices, a driver's seat 15, and a control box 16. It is attached to the aircraft.

As shown in FIG. 2, a part of the output of the engine 14 is transmitted by a belt to a hydraulic continuously variable transmission 17, and the output of the continuously variable transmission 17 is transmitted to a drive case 18 through a gear. The system is constructed so that the vehicle speed can be varied steplessly. Further, a part of the engine output is transmitted to the threshing device 10 and the cutter 12 in an intermittent manner using a belt tension type threshing clutch 19. Furthermore, although not shown, a part of the output of the transmission device 17 is transmitted to the lifting device 1, the cutting blade 2, and the conveying device 3.

A speed change lever 20 is linked to the continuously variable transmission 17 via a link mechanism 21, so that the continuously variable transmission 17 can be manually operated by the lever 20, and the vehicle speed can be changed manually.

As shown in FIG. 2, a device 2 detects the threshing load of the threshing device 10 as the driving torque of the handling cylinder 5.
2, a device 23 is attached to the threshing device 10 for detecting the rotational speed of the handling barrel as the rotational speed N of the engine 14 using the component mechanism of the torque detection device 22, and an input device 23 for detecting the rotational speed N of the engine 14 is attached to the threshing device 10; A device 24 for detecting rotational speed as vehicle speed is attached to the traveling drive case 18, and each of the detection devices 22, 23, 24 and the continuously variable transmission 17 are linked by a control mechanism 25. As shown in FIGS. 2 and 3, the link mechanism 21 is connected to the link mechanism 21 via a friction transmission mechanism 26 for enabling priority to manual operation of the continuously variable transmission 17.
1, a reversibly rotatable electric motor 27,
A circuit 28a that drives and operates the motor 27 to increase the speed of the continuously variable transmission 17, and operates the motor 27 to drive the motor 27 to the deceleration side of the continuously variable transmission 17 at a higher speed than the drive circuit 28a for increasing the speed. circuit 28
b. When the vehicle speed is zero or close to zero, the threshing device 1
A device 29 for storing the engine rotational speed N ₀ when the drive torque of N 0 is below a set value and the engine 14 is shifted to a set speed or higher, and a threshing device 1
A device 30 for setting a reference drive torque T ₀ of 0, a setting speed interval ΔN toward a low speed based on the engine rotation speed N ₀ stored in the storage device 29.
Four engine rotational speed ranges N ₁ divided at intervals,
N ₂ , N ₃ , N ₄ and the setting torque interval △ on the increasing and decreasing sides based on the reference threshing drive torque T ₀
Four threshing drive torque ranges T ₁ divided at intervals of T,
In detail, the proper balance relationship between T ₂ , T ₃ , and T ₄ is such that the larger the torque range corresponds to the larger the speed range, as shown in Figure 4. , 16 balance states obtained based on 4 torque ranges T ₁ ... and 4 speed ranges N ₁ ... are determined from C 1 to C ₁ by determining the magnitude of the product of drive torque T and rotational speed N. A device 31 for dividing C ₇ into seven ranks and setting C ₃ among these divided ranks C ₁ as an appropriate balance relationship, the torque detection device 22 , the speed detection device 23 , and the appropriate balance relationship setting device 31 Based on the signal from the controller, it is determined which rank among the seven ranks C1 the threshing drive torque T and engine rotational speed _N are located in, and based on the result of this determination, there is no need to shift the vehicle speed at rank _C3 . , deceleration is required for ranks C ₄ to _{C 7} , ranks C ₁ and C ₂
In addition to determining the need for speed increase, we also determine the rank
A vehicle speed change amount setting device 32 that sets the deceleration amount so that it becomes larger as it goes from C ₄ to C ₇ , and sets the speed increase amount so that rank C ₁ becomes larger than rank C ₂ ; A device 3 that sets a target vehicle speed by a set speed at each set time based on signals from the vehicle speed change amount setting device 32 and the vehicle speed detecting device 24.
3. While comparing and determining the signals of the target vehicle speed setting device 33 and the vehicle speed detecting device 24, operate the speed increasing operation drive circuit 28a or the deceleration operation drive circuit 28b so that the target vehicle speed and the actual vehicle speed become the same. The control mechanism 25 is connected to each of the comparison circuits 34 to be operated.
has been configured. That is, the control mechanism 25
to maintain the driving torque T of the threshing device 10 and the rotational speed N of the engine 14 within the torque range and speed range having the appropriate balance relationship based on information from each of the detection devices 22, 23, and 24,
To automatically increase/decelerate the transmission 17,
Further, the deceleration control is configured to be performed at a higher speed than the speed increase control.

In short, the vehicle speed is automatically changed so as to apply a load as large as possible to the engine 14 within its allowable load range, and to apply a load as large as possible to the threshing device 10 within its allowable load range. This makes it possible to work while effectively using the engine power and without overload, and by performing deceleration control at a higher speed than speed increase control, overload does not occur in the threshing device 10. In addition, hunting during speed increase is suppressed.

As shown in FIG. 3, both drive circuits 28a,
A switch 35 for switching the mower 28b between an operating state and a non-operating state is connected to a clutch 36 for the cutting blade 2 so as to be engaged only when the clutch 36 is in an engaged state, so that the cutting blade 2 is driven. The control mechanism 25 is made operable only when the operation is performed.

As shown in FIG. 3, the target vehicle speed setting device 3
3, a device 37 for changing and setting the target maximum vehicle speed V set thereby to the first to fourth speeds V ₁ , V ₂ , V ₃ , V ₄ is attached, and both drive circuits 28
a, 28b are attached with a device 38 for switching them between an operating state and a non-operating state, and the setting device 37 and switching device 38 are linked by a linkage mechanism having a rotary operating tool 39 shown in FIG. At the same time, when the operating tool 39 is operated to the first operating position MAN, the switching device 38 switches between both drive circuits 28a and 28b.
is in a first operating state, in which it is in an inoperative state, and
When the operating tool 39 is operated to the second operating position _V1 within the rotation range AUT, the switching device 38 is in the second operating state in which both drive circuits 28a and 28b are activated, and the setting device 37 is set to the target maximum position. Speed V is 1st speed
When the state is set to V ₁ and the operating tool 39 is operated to the third operating position V ₂ in the rotation range AUT, the switching device 38 is in the second operating state,
When the setting device 37 is in a state where the target maximum speed V is set to the second speed V ₂ and the operating tool 39 is further operated to the fourth operating position V ₃ within the rotation range AUT, the switching device 38 is set to the second speed V 2 . In the second operating state, the setting device 37 is in a state where the target maximum vehicle speed V is set to the third speed _V3 , and furthermore, the operating tool 39 is set within the rotation range.
When operated to the 5th operation position V ₄ of AUT,
When the switching device 38 is in the second state, the setting device 37
The configuration is such that the target maximum vehicle speed V is set to the fourth speed _V4 .

That is, by a series of displacement operations of the operating tool 39, the control mechanism 25 can be switched between an operating state and a non-operating state, and the maximum shifting speed V produced by the control mechanism 25 can be changed and set in four stages. There is. Further, the operating tool 39 is activated based on rotation detection of a rotor (not shown) linked to the operating tool 39.
a detection device 40 configured to detect that the operating tool 39 has been operated; a timer circuit 41 configured to operate each time the detection device 40 enters a state of detecting that the operating tool 39 has been operated; and this timer circuit. Each time 41 is activated, and only while the timer circuit 4 is activated, each operating circuit 42 acts on the switching device 38 to bring it into the first operating state. Based on the detection that the operating tool 39 has been operated, the control mechanism 25 becomes inactive for a preset period of time required for operating the operating tool 39 over its entire stroke. An operating mechanism 43 is configured to automatically operate the control mechanism 25, and each time the operating tool 39 is operated, the control mechanism 25 is switched to a non-operating state for the set time.

In short, by simply operating one operating tool 39, it is possible to switch between a state in which work is performed while manually changing the speed and a state in which work is performed while driving in an automatic speed change using the control mechanism 25, and a state in which work is performed while driving in an automatic speed change using the control mechanism 25. In addition, when switching between manual transmission driving and automatic transmission driving, even if the operating tool 39 is at the current operating position MAN or V ₂
Or, the operating tool 39 must pass through another operating position V ₁ to V ₃ that is different from the target operating position, such as when operating the target operating position V ₂ to V ₄ or MAN, which should be newly located from V ₄ . Even in the case where the control mechanism 25 shifts the gear only after the operating tool 39 reaches the operating position V ₂ to V ₄ for automatic transmission driving, as shown in FIG. 6, or the operating tool 39 is operated manually. The vehicle speed is not changed due to passing through operation positions V ₃ to V ₁ of the automatic shift travel positions AUT before reaching the shift travel position MAN.

Furthermore, as shown in the above embodiment, the deceleration control by the control mechanism 25 is configured to be performed at a higher speed than the speed increase control, and the target vehicle speed for control is configured to be updated by the set speed at each set time. If the above-mentioned operating mechanism 43 is provided in the vehicle, the operating tool 39 may pass through another operating position before reaching the target operating position and the vehicle speed will be significantly reduced, or the operating tool 39 may not reach the target operating position. Even if the target vehicle speed setting device 33 is operated to the target vehicle speed setting device 33, the target vehicle speed setting device 33 is set to a lower maximum speed, thereby eliminating the time delay in speed increase control. Although it is advantageous, it is advantageous to have a configuration in which the controlled speed change on the speed increasing side and a controlled speed change in the deceleration side are performed at the same speed, a configuration in which the change setting of the control target vehicle speed is instantaneously performed, and furthermore, a control tool. It can also be applied to a configuration in which the maximum speed of shifting increases as the operating position of the control mechanism becomes inactive.

In summary, in the above-mentioned combine harvester, the present invention allows the control mechanism 25 to be deactivated for a set time after the operation tool 39 is operated based on the detection that the operation tool 39 has been operated. It is characterized by being provided with a mechanism 43 that automatically operates so that the state is reached.

That is, according to the above configuration, by setting the time required for a full stroke operation of the operating tool 39 as the set time, even if the operating tool 39 is moved from the current operating position to the new target operating position. Even if the operating tool 39 passes through an operating position other than the target operating position during operation, the control mechanism 25 remains inactive at least from the time the operating tool 39 starts operating until the operating tool 39 reaches the target operating position. As a result, unequal changes in vehicle speed caused by the operation tool 39 passing through an operation position other than the target operation position are prevented, and the operator is not fatigued without undue discomfort or vibration. And now they can work in safe conditions.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the combine harvester according to the present invention, with Fig. 1 being a schematic side view, Fig. 2 being a transmission system diagram, Fig. 3 being a block diagram of the control system, and Fig. 4 showing the rotation range and torque range. 5 is a plan view showing the operation position of the operating tool, FIG. 6 is an explanatory view showing the state of change in vehicle speed, and FIG. 7 is an explanatory view showing the state of change in vehicle speed in the conventional structure. be. 22... Threshing load detection device, 25... Control mechanism, 39... Operation tool, 43... Action mechanism, V...
Maximum shifting speed.

Claims (1)

[Claims] 1. It is possible to change the maximum speed V of the control mechanism 25 that automatically increases/decelerates the manually operable traveling transmission 17 so that the threshing load remains approximately constant based on information from the threshing load detection device 22. The combine harvester is provided with an operation tool 39 for switching the control mechanism 25 between an operating state and a non-operating state in accordance with a series of displacements, and for changing and setting the maximum shifting speed V. A mechanism 43 is provided which automatically acts on the control mechanism 25 to put it in a non-operating state for a set time after the operating tool 39 is operated, based on detection that the tool 39 has been operated. A combine harvester that is characterized by one thing.