JPH0212529B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is designed to enable work to be carried out while reliably preventing the occurrence of work overload, and to achieve a maximum vehicle speed according to the wishes of the worker, field conditions, and grain culm conditions. The control mechanism that automatically increases/decelerates the traveling transmission so that the workload remains approximately constant based on information from the workload detection device is in a state where the maximum shifting speed can be changed. To provide a combine harvester provided in the above, so that when a set maximum vehicle speed is changed, an operation target vehicle speed is changed accordingly, and a speed change adjustment to a new target vehicle speed is quickly performed.

Next, a combine harvester embodiment 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 holding and transporting the harvested grain culms backwards. The conveyed grain stems are held and conveyed by the feed chain 4 while being handled and processed by the rotating handling drum 5, and the processed material is subjected to the blowing action of the chisel 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 to a hydraulic continuously variable transmission 17 using a belt, 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. Further, 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, and an electric motor 22 capable of forward and reverse rotation is linked to the speed change lever 20 via a friction transmission mechanism 23. The vehicle speed can be changed using the lever 20 and the motor 22, and the vehicle speed can be changed preferentially using the lever 20 even while the motor 22 is in operation.

As shown in FIG. 2, a device 24 detects the threshing load as the driving torque T of the handling drum 5, and the rotational speed of the handling drum is detected as the rotational speed N of the engine 14 using the configuration mechanism of this torque detection device 24. A device 25 is attached to the threshing device 10, and a device 26 for detecting the input rotational speed of the traveling drive case 18 as a vehicle speed is attached to the traveling drive case 18. ,2
6 and the motor 22 are linked by a control device A to constitute a vehicle speed control mechanism. The control device A comprises an engine rotation when the vehicle speed is zero or close to zero, the drive torque of the threshing device 10 is below a set value, and the engine 14 is shifted to a set speed or higher. A device 27 for storing the speed N ₀ , a device 28 for setting the standard drive torque T ₀ of the threshing device 10 , and a set speed interval △ to the lower speed based on the engine rotational speed N ₀ stored by the storage device 27 Divide every N 4
Four threshers are divided into engine rotational speed ranges N ₁ , N ₂ , N ₃ , N ₄ and set torque intervals ΔT between increasing and decreasing threshing torques based on the reference threshing drive torque T ₀ . The proper balance relationship between the driving torque ranges T ₁ , T ₂ , T ₃ , and T ₄ is such that the larger the torque range, the larger the speed range.
To be more specific, as shown in Fig. 4, 16 balance states obtained based on four torque ranges T _{1 .} . . and four speed regions N ₁ . It is divided into 7 levels from C ₁ to _{C 7} based on the magnitude of the product with the speed N, and these divided ranks C ₁ ...
A device 29 for setting C ₃ of these as an appropriate balance relationship, the torque detection device 24, the speed detection device 25, and the appropriate balance relationship setting device 2.
Based on the signal from 9, the threshing drive torque T and the engine rotational speed N are set to rank _C1 of the seven stages.
It determines which rank it is located in, and based on this determination result, in rank C ₃ , there is no need to change the vehicle speed.
It determines whether deceleration is required for ranks C ₄ to C ₇ , and whether acceleration is required for ranks C ₁ and C _{2 .}
A vehicle speed change amount setting device 30 that sets a deceleration amount such that it becomes larger toward C ₇ , and sets a speed increase amount such that rank C ₁ is made larger than rank C ₂ ; A device 31 that sets a target vehicle speed at appropriate set time intervals based on signals from the speed setting device 30 and the vehicle speed detecting device 26, compares and discriminates the signals from the target vehicle speed setting device 31 and the vehicle speed detecting device 26, and sets the target vehicle speed. Comparison circuits 33 are provided for operating the speed increase operation drive circuit 32a or the deceleration operation drive circuit 32b of the motor 22 so that the actual vehicle speed becomes the same as the actual vehicle speed.

In short, based on the detected values from each of the detection devices 24, 25, and 26 and the set value from the torque setting device 28, the driving torque T of the threshing device 10 and the rotational speed N of the engine 14 are brought into the appropriate balanced relationship. The vehicle speed control mechanism is configured to automatically increase/decelerate the transmission 17 so as to maintain the engine 14 within the torque range and speed range.
The vehicle speed is automatically changed in an efficient manner so as to apply a load as large as possible within the permissible load range to the threshing device 10, and to apply a load as large as possible within the permissible range to the threshing device 10. It is configured to perform reaping and harvesting work.

Further, as shown in FIG. 3, both drive circuits 32
A switch 34 for switching a and 32b between an operating state and a non-operating state is provided in a state that is pressed into operation by the grain culm transported by the transport device 3,
A delay circuit 35 is provided to delay the time until both drive circuits 32a and 32b are switched to the operating state after the switch 34 is turned on by an appropriate amount of time Δt, and then the aircraft enters the grain culm group. When the reaping operation is started, the switch 34 is turned on and the grain culm is transferred to the threshing device 10.
When the appropriate time Δt passed,
The automatic vehicle speed change operation is automatically started, and the machine body leaves the grain culm group and the switch 34 is activated.
When the vehicle is turned off, the automatic vehicle speed change operation is automatically stopped.

Further, a device 36 is provided to change and set the maximum vehicle speed that can be set by the target vehicle speed setting device 31 to four speeds V ₁ , V ₂ , V ₃ , and V ₄ , so that the vehicle speed is automatically adjusted as described above. The maximum vehicle speed that can be changed can be changed depending on field conditions and grain culm conditions.

The switch 34 and the maximum vehicle speed setting device 3
After the automatic vehicle speed change operation is started based on the signal No. 6, the maximum vehicle speed that can be set by the target vehicle speed setting device 31 is limited to the vehicle speed set by the maximum vehicle speed setting device 36. A device 37 is provided to sequentially increase the vehicle speed to a vehicle speed that can be changed by the maximum vehicle speed setting device 36 at appropriate set time intervals, so that the vehicle speed increase operation after the automatic vehicle speed change operation has been started is provided. , as shown in FIG. 5, preset vehicle speeds V ₁ , V ₂ , V ₃ , V ₄ at each set time t.
The configuration is such that the speed is increased sequentially.

Both drive circuits 32a, 32 are arranged so that the speed change operation speed by the vehicle speed control mechanism is higher than normal.
A speed increase device 38 that increases the operating speed of the motor 22 by the control device A to a higher speed than usual is attached to the control device A, and the speed increase device 38, the maximum vehicle speed setting device 36, the vehicle speed detection device 26, and the target The vehicle speed setting devices 31 are linked by a device 39 that switches the speed increasing device 38 between an operating state and a non-operating state based on information from the maximum vehicle speed setting device 36, the vehicle speed detecting device 26, and the target vehicle speed setting device 31, respectively. At the same time, this switching device 39 is switched to the speed increasing device 3 every time the set vehicle speed of the maximum vehicle speed setting device 36 is changed.
8 is configured to operate as follows. In other words, if the operating target vehicle speed changes due to a change in the set maximum vehicle speed and the threshing load at that time and a shift becomes necessary, the vehicle speed will be increased only until the vehicle speed reaches the new target vehicle speed. Speed device 38
Even if the set maximum vehicle speed is changed, the operating target vehicle speed will not change due to the threshing load at that time and there is no need to shift, the speed will be increased for a certain period of time set by the setting device 40. Device 3
8.

In short, for example, as shown in FIG. 6, when the maximum shifting speed is set to V ₃ and the vehicle speed expressed by the vehicle speed control mechanism is V, which is higher than V ₂ , the set maximum shifting speed is V ₂ . When changed to
Time required to shift even at normal shifting speed
The vehicle is decelerated to the new target vehicle speed _V2 in a required time _t2 that is shorter _{than t1} , and as shown in FIG. If the set maximum speed is changed to _V4 when the current vehicle speed is _V3 , the speed will be increased to the new target vehicle speed V in a time _t2 that is shorter than the time _t1 required to shift at the normal speed. It is designed so that it will be done.

In the embodiment, the control mechanism includes a threshing load detection device 24 and an engine rotation speed detection device 2.
5, the vehicle speed is automatically changed based on the information from the load detection device 24.
It may be configured such that the vehicle speed is changed only based on this information.

In summary, the present invention provides the above-mentioned combine harvester with a device 38 that makes the speed of the shift operation by the control mechanism higher than normal, and is activated every time the maximum speed of shift by the control mechanism is changed. characterized by something.

In other words, when the maximum set speed is changed and the target vehicle speed changes, the control mechanism performs a shift operation to match the vehicle speed with the new target speed. Since the speed increase device 38 for the shift operation speed is configured to operate automatically, the vehicle speed can be adjusted to a new target vehicle speed due to a change in the set maximum shift speed more quickly and in a shorter time than when it is performed at the normal shift speed. It started to be done. Therefore, even if grain culm conditions deteriorate and the set maximum vehicle speed is changed to a lower speed during the work, the vehicle speed will not decrease slowly and the grain culm will be supplied to the work section at the same high speed as before the setting change. This may result in a large work overload, or even if the grain culm conditions have recovered and the set maximum vehicle speed is changed to a higher speed, the vehicle speed increase is slow and the grain culm supply to the work section remains as before the setting change. It is possible to minimize the occurrence of troubles caused by slow changes in vehicle speed due to changes in the set maximum vehicle speed, such as being unable to fully utilize the work processing capacity due to low speeds. It has become possible to more reliably prevent the occurrence of work overload while making it easier to perform, and to use power more effectively.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the combine harvester according to the present invention, in which Fig. 1 is a schematic side view, Fig. 2 is a schematic diagram of the transmission system, Fig. 3 is a block diagram of the control system, and Fig. 4 is a torque range and speed. FIG. 5 is an explanatory diagram showing the shift state, and FIGS. 6 and 7 are explanatory diagrams showing the vehicle speed change state due to a change in the set maximum speed. 17... Travel transmission device, 24... Work load detection device, 38... Speed increase device.

Claims (1)

[Claims] 1 Based on the information from the workload detection device 24, the traveling transmission 17 is adjusted so that the workload is approximately constant.
The combine harvester is equipped with a control mechanism that automatically increases and decelerates the gear shift in a state where the maximum gear shift speed can be changed and set, and a device 38 that makes the gear shift operation speed by the control mechanism higher than normal is controlled by the control mechanism. A combine harvester characterized in that it is provided in a state in which it operates every time the maximum speed of shifting by a mechanism is changed.