JPS6334502Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses a control mechanism that automatically increases/decelerates the manually operable traveling transmission so that the threshing load remains approximately constant based on information from the threshing load detection device. In a state in which the control is performed at a higher speed than the speed increase control, and the maximum speed of the speed change is freely settable, the control mechanism is switched between an operating state and a non-actuating state in accordance with a series of displacements, and the maximum speed of the shift is changed. The present invention relates to a combine harvester equipped with an operating tool for changing settings.

In the combine harvester described above, since the deceleration control is performed at a higher speed than the speed increase control, there is an advantage that threshing overload is quickly eliminated and hunting during speed increase control is suppressed. A single operating tool can be used to switch between automatic transmission and manual transmission, and to change and set the maximum speed achieved during automatic transmission according to the planting status of grain culms and the operator's wishes. It has the advantage of being easy to do. However, conventionally, as shown in FIG.
9 was configured so that the maximum speed of shifting by the control mechanism became smaller as the control mechanism became inactive (MAN), so when switching between manual gear shifting operation and automatic gear shifting operation, The vehicle speed is subject to drastic changes in deceleration, which tends to cause discomfort to workers on the tower. This is because, as shown in FIG. 9, for example, during a manual gear shifting operation, when a set gear shifting operation is performed using the operating tool 39, a speed Va higher than the minimum speed V ₁ of the maximum shift speed V that can be set by the operating tool 39 is set. The vehicle is traveling at a speed V1, and is switched to automatic transmission mode, and the maximum speed V is set to a higher speed than the minimum speed _V1 , for example, _V2 , and the control mechanism at the time of switching When the vehicle speed is at a speed corresponding to a higher value than the speed Va during manual transmission driving, for example, Vb, the operating tool 39 is moved to the setting operation position of the maximum transmission speed _V2 .
Before the vehicle is positioned at V ₂ , it passes through an operation position V ₁ that sets a speed lower than the speed Va, for example V ₁ , so after the vehicle speed is once decelerated from Va to V ₁ even at a high speed. This is because the speed is increased toward Vb.

The present invention makes it possible to avoid deceleration and suppress the range of change to a small extent even if the vehicle speed changes due to switching between manual gear shifting operations and manual gear shifting operations through simple modification. The aim is to avoid trouble as much as possible.

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 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 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, 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 by both manual operation of the transmission 17 using the lever 20 and operation of the transmission 17 using the motor 22, and
Even when the motor 22 is in operation, the lever 2
The vehicle speed can be changed preferentially at 0.

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.
4, and a device 25 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 constituent mechanism of the torque detection device 24, and an input device 25 for detecting the rotational speed N of the engine 14 is attached to the threshing device 10; A device 26 for detecting rotational speed as vehicle speed is attached to the driving drive case 18, and each of the detection devices 24, 25, 26 and the motor 22 are linked by a control device A to constitute a vehicle speed control mechanism. be.

As shown in FIG. 3, the control device A is configured such that when the vehicle speed is zero or close to zero, the driving torque of the threshing device 10 is below a set value, and the engine 14 is running at a speed higher than the set speed. a device 27 for storing the engine rotational speed V ₀ when the gear is being changed;
A device 28 for setting the reference drive torque T ₀ of the threshing device 10, the stored engine rotation speed
4 engine rotation speed ranges N ₁ divided at set speed intervals △N toward low speeds with N ₀ as a reference;
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. , four torque ranges T ₁ ... and four speed ranges N ₁ ...
The 16 balance states obtained based on...
A device 29 that divides the product of drive torque T and rotational speed N into seven levels C ₁ to _{C 7} by determining the magnitude of the value, and sets C ₃ of these divided ranks C ₁ . . . as an appropriate balance relationship. , the torque detection device 2
4. Based on the signals from the speed detecting device 25 and the appropriate balance relationship setting device 29, which rank among the seven ranks C ₁ the threshing drive torque T and the engine rotational speed N are located in? Based on this determination result, it is determined that vehicle speed change is not required for rank C ₃ , deceleration is required for ranks C ₄ to _{C 7} , and speed increase is required for ranks C ₁ and C ₂ .
Set the deceleration amount so that it becomes larger as it goes from rank C ₄ to C ₇ , and rank C ₁
A vehicle speed change amount setting device 30 that sets the speed increase amount in a state where the speed increase is greater than C ₂ , and a target vehicle speed is set at appropriate set time intervals based on signals from the vehicle speed change amount setting device 30 and the vehicle speed detection device 26. Device 3
1. While comparing and determining the signals from the target vehicle speed setting device 31 and the vehicle speed detecting device 26, the drive circuit 32a for increasing the speed of the motor 22 or the drive circuit for decelerating the motor 22 is set so that the target vehicle speed and the actual vehicle speed become the same. Comparing circuits 33 for operating the circuits 32b are provided, and the motor operation speed of the deceleration operation drive circuit 32b is configured to be higher than the motor operation speed of the speed increase operation drive circuit 32a. That is, based on the information from each of the detection devices 24, 25, and 26, the drive torque T of the threshing device 10 and the rotational speed N of the engine 14 are maintained within the torque range and speed range that have the appropriate balance relationship.
To automatically increase/decelerate the transmission 17,
Further, the vehicle speed control mechanism is configured to perform deceleration control at a higher speed than 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 32a,
A main switch 38 for manually switching the drive circuit 32b between an operating state and a non-operating state is attached to the control device A, and a switch 34 for switching both drive circuits 32a and 32b between an operating state and a non-operating state is attached to the control device A. is provided on the conveying device 3 in such a state that it is pressed into operation by the grain culms conveyed by the conveying device 3, and after this switch 34 is turned on, both the drive circuits 32a, 32b are switched to the operating state. A delay circuit 35 is attached to the control device A to delay the time until the vehicle speed is changed by an appropriate amount of time Δt, and the main switch 38 is turned off to keep the vehicle speed control mechanism inactive, thereby allowing manual gear shifting. The main switch 38
When the machine enters the stem culm group and starts reaping with the switch 34 in the engaged state, the switch 34
is operated, and then the grain culm is transferred to the threshing device 1.
When the appropriate time Δt has elapsed, the automatic vehicle speed change operation is automatically started;
Moreover, the aircraft separates from the stem culm group and the switch 3
4 is in the off state, 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. Then, a device 37 is provided that sequentially increases the vehicle speed to a vehicle speed that can be changed and set by the maximum vehicle speed setting device 36 at a set appropriate time interval, and then performs a speed increase operation after the automatic vehicle speed change operation is started. As shown in FIG. 5, the vehicle speed is sequentially increased to preset vehicle speeds V ₁ , V ₂ , V ₃ , and V ₄ at every set time t.

The main switch 38 and the maximum vehicle speed setting device 36 are linked to an operating tool 39 that is rotatably provided as shown in FIG. 6, and when the operating tool 39 is in the manual position MAN, the main switch 38 is turned off. , and when the operating tool 39 is in the automatic position (AUT), the main switch 38 is in the on state, and as the operating tool 39 is displaced in the automatic position (AUT), the maximum vehicle speed setting device 36 is operated. Furthermore, four operating positions for operating the maximum vehicle speed setting device 36 of the operating tool 39 are provided.
V ₁ , V ₂ , V ₃ , and V ₄ are configured such that the speed set by the maximum vehicle speed setting device 36 becomes higher toward the manual position MAN. In other words, the operating tool 3
The vehicle speed control mechanism can be switched between an operating state and a non-operating state by a series of displacement operations in step 9, and the maximum speed V for shifting by the vehicle speed control mechanism can be changed and set. The switching of driving mode and the setting of the maximum speed V that appears during automatic transmission driving can be easily performed, and the operating positions of the operating tool 39 are MAN, V ₁ ,
By configuring V ₂ , V ₃ , and V ₄ so that the maximum shift speed V increases toward the MAN side where the vehicle speed control mechanism is inactive, the vehicle speed when switching between manual shift driving and automatic shift driving can be reduced. The change direction is on the speed increasing side and the range of change is suppressed.

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.
The vehicle speed may be changed only based on the information.

In summary, the present invention provides the above-mentioned combine harvester with the operating position MAN of the operating tool 39,
The present invention is characterized in that V ₁ , V ₂ , V ₃ , and V ₄ are configured such that the maximum speed V of shifting by the control mechanism increases toward the position where the control mechanism becomes inactive.

In other words, when switching from manual transmission driving to automatic transmission driving, or when switching to automatic transmission driving, the operating tool 39 should be switched to the target operation position where the operation tool 39 is to be operated, or to the non-operating position MAN of the control mechanism. Since the operation position at which the set maximum speed of the gear shift is higher than the operation position at which the shift is made is made to elapse, even if the vehicle speed changes due to the changeover, for example, as shown in FIG. In addition, the vehicle speed is changed to the acceleration side, and the speed increase control is performed at a lower speed than the deceleration control, and the range of change W is smaller than before. What's more, it is a simple modification that involves reversing the parallel order of the operation positions, minimizing the deterioration of riding comfort when the vehicle speed changes when switching between manual transmission driving and automatic transmission driving, thereby reducing driver fatigue. We were able to provide a difficult combine harvester at a low price.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the combine harvester according to the present invention, and 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 mechanism, and FIG. 4 is a diagram showing the torque range. FIG. 5 is an explanatory diagram showing the relationship between speed ranges. FIG. 5 is an explanatory diagram showing the state of change in vehicle speed. FIG. FIG. 8 is a plan view of the conventional structure, and FIG. 9 is an explanatory diagram showing changes in vehicle speed in the case of the conventional structure. 17... Traveling transmission device, 24... Threshing load detection device, 39... Operating tool, V... Maximum speed change speed,
MAN, V ₁ , V ₂ , V ₃ , V ₄ ...Operating position.

Claims (1)

[Scope of utility model registration request] A control mechanism for automatically increasing or decreasing the speed of a manually operable traveling speed change device 17 so that the threshing load is approximately constant based on information from a threshing load detection device 24, in a state in which the deceleration control is performed at a higher speed than the acceleration control, and the maximum speed change speed V can be freely changed and set, and an operating tool 39 is provided for switching the control mechanism between an operating state and a non-operating state in accordance with a series of displacements and for changing and setting the maximum speed change speed V,
A combine harvester comprising: MAN, _V1 , _V2 , _V3 , and _V4 configured such that the maximum speed V of the speed change control mechanism increases toward the position where the control mechanism is inoperative.