JPH06225625A - Structure for driving of combine harvester - Google Patents

Abstract

PURPOSE:To eliminate unnecessary deceleration in operation at a low speed by providing a speed change part for exclusive use of a reaping part and changing the speed according to a travel speed zone. CONSTITUTION:A synchronously driving type combine harvester for synchronously driving a travel device and a reaping part is equipped with a reaping speed change mechanism (H) for changing the speed of engine power passing through an HST 8 into two high and low stages. A geared motor 30 for subjecting the reaping speed change mechanism (H) to speed changing operation and switch 34 and 35, acting on an operating plate 36 of a speed change lever 31 and sensing the travel speed are installed. The reaping speed change mechanism is subjected to the operation to change over the speed change ratio to the low speed side when the car speed is increased with a controller 33 for controlling the reaping speed change mechanism and to the high speed side when the car speed is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed so that the driving speed of the mowing section is increased as the traveling speed becomes faster, and the driving speed of the mowing section is also reduced as the traveling speed becomes slower, that is, the traveling transmission system and the mowing The present invention relates to a combine in which a transmission system is configured to drive the transmission system in synchronization.

[0002]

2. Description of the Related Art As a combine of this type, Japanese Patent Laid-Open No.
As disclosed in Japanese Laid-Open Patent Publication No. 2771723, by taking out the engine power from the traveling transmission HST from the traveling mission and inputting it to the mowing unit,
A technique is known in which a traveling transmission system and a cutting transmission system are synchronously driven.

[0003]

The stem culm to be cut is not only in a dry and upright state suitable for harvesting, but also in a poor state in which it is wet with rain dew or laid down. In particular, since it is often wet at the same time when lying down, it is desirable to strengthen the stem-culm erecting action such that the running speed is low and the raising speed is relatively increased in order to perform appropriate mowing. In such a case, in the conventional synchronous drive type combine, the drive speed of the mowing unit is made relatively higher than the drive speed of the traveling device by switching the auxiliary transmission mechanism that transmits the power that has passed through the HST to the traveling device to the low speed side. The speed-increasing means has been adopted in which the speed-up drive state of the raising device is revealed by speeding up. With the speed increasing means, it is possible to perform the pre-mowing treatment work without any inconvenience even in the laid state, but this tends to cause the traveling speed to be too slow, and there is room for improvement in terms of work efficiency. It was There is also the idea of setting the drive speed ratio of the mowing unit to the traveling speed from the beginning to be suitable for harvesting the lodging stem culm, but with this, the driving speed of the mowing unit during normal work traveling is high. There is an inconvenience,
It will not be realized. An object of the present invention is to eliminate an unnecessary reduction in the traveling speed at the time of felling cutting with a combine adopting a synchronous drive structure, and to improve the work efficiency.

[0004]

In order to achieve the above object, the present invention is provided with a mowing section for mowing planted stem culms and sequentially transporting the stalks to the threshing device, and a shifting gear for traveling. In a drive structure of a combine configured to transmit the engine power that has passed through the device to the mowing section, a mowing transmission mechanism that shifts the engine power that has passed through the transmission device to high and low stages and outputs it to the mowing section, and a gear shifting operation thereof. And a vehicle speed detecting means for detecting a traveling speed,
The vehicle speed detection means and the speed change operation means are operated so that the speed change ratio of the mowing gear change mechanism is switched to the low speed side when the traveling speed becomes fast, and the speed change ratio of the mowing gear change mechanism is switched to the high speed side when the traveling speed becomes slow. It is characterized in that it is provided with a control device associated therewith.

[0005]

[Function] The work traveling speed is set to a low speed when the stalks to be mowed, such as lodging and wetting, are in a poor state, and in good conditions such as drying and standing, the work traveling speed should be made as fast as possible from the viewpoint of improving work efficiency. Become. In other words, low-speed work traveling is a state in which the drive speed of the mowing section is desired to be increased, so a mowing speed change mechanism that shifts the engine power via the traveling transmission device to high and low stages and outputs it to the mowing section is used. When the traveling speed is low, the driving speed of the mowing unit is increased, and when the traveling speed is high, the driving speed of the mowing unit is slowed and the gears are linked to shift to the standard driving state. As shown in the graph in Fig. 3, the cutting gear shifting mechanism is switched to the high speed side in low-speed work running up to 0.7 m / s with respect to the standard line a (virtual line) between the running speed and the cutting unit driving speed in the synchronized drive mode. Lucked-up relationship line b (dashed line)
Becomes As a result, the actual relation line c becomes a state like a saw blade shape in which the lines a and b shown by the solid line are united, and the lodging stem can be pulled up at a high raising speed without unnecessarily lowering the working speed unlike the conventional case. A faster reaping section drive state appears during low-speed work traveling, such as lightly raising the culm. (Note that the line c is intentionally shifted from the lines a and b in FIG. 6 for understanding the drawing.)

[0006]

Therefore, by providing a gear shifting section dedicated to the reaping section and shifting the gear depending on the traveling speed range, unnecessary speed reduction at low speed work can be eliminated and the work efficiency is improved. We were able to further improve the performance of the inherently efficient tuning drive combine.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. A combine is shown in FIG. 7, A is a cutting unit, B is a traveling machine body, and C is a threshing device. The mowing section A is equipped with a raising device 1, a mowing device 2, a conveying device 3, etc., and the mowing stem culms from the conveying device 3 are transferred to the threshing feed chain 4. Incidentally, 5 is a crawler traveling device, and 6 is a control section.

Next, the drive structure of this combine will be described. The drive system is shown in FIG. 2, 7 is an engine, 8 is a hydrostatic continuously variable transmission (HST), 9 is a main clutch, 10 is a mission, and 8b is a mowing output shaft for outputting the output of the HST 8 to the mowing section A. , 11 is a reaping clutch, 12 is a counter shaft,
13 is a threshing clutch, 14 is a branch transmission mechanism, and 15 is a handling cylinder. In this drive system, the reaper output shaft 8b is input to the reaper A so that the reaper A can be shifted in synchronization with the crawler traveling device 5. Then, the first transmission mechanism E that transmits from the counter shaft 12 to the feed chain 4 so that the feed chain 4 also shifts in synchronization with the crawler traveling device 5, and the first transmission mechanism E that transmits the engine power that does not pass through the HST 8 to the feed chain 4. The second transmission mechanism F is provided, the first transmission mechanism E is in the transmission state, and the second transmission mechanism F is in the transmission disconnection state, and the first transmission mechanism E is in the transmission disconnection state. A switching mechanism G is provided that selectively presents the constant speed transmission mode in which the second transmission mechanism F is in the transmission state.

That is, the second pulley 17 which is belt-linked to the transmission shaft 16 and the first pulley 18 which is belt-linked to the counter shaft 12 are loosely fitted to the intermediate shaft 19, and
A meshing shifter 20 that meshes with one of the first and second pulleys 18 and 17 is slidably fitted onto the intermediate shaft 19 so as to be slidable.
And the like, the first transmission mechanism E engages with the second pulley 17 and the meshing shifter 2
The second transmission mechanism F is configured by 0 or the like. The meshing shifter 20 is switched by a switching mechanism G including an electric cylinder 21 and a swinging fork 22, and a speedometer 24 is connected to a first control device 23 that controls the operation of the electric cylinder 21. When the traveling speed is equal to or lower than the predetermined speed, the meshing shifter 20 meshes with the first pulley 18 to provide a tuned transmission mode, and when the traveling speed is equal to or higher than the predetermined speed, the meshing shifter 20 causes the second pulley 17 to move. The first control device 23 controls the speedometer 24 and the electric cylinder 21 in an interlocking manner so that the constant velocity transmission form appears by engaging with the. For example, the running speed is 0m / s
To 0.5 m / s, the drive speed of the feed chain 4 is proportionally increased and decreased in the range of 0 m / s to 0.8 m / s. The constant speed transmission mode is maintained in which the chain speed is kept constant at 0.8 m / s. At the switching point, the feed chain speeds by the first and second transmission mechanisms E and F are the same (0.8 m). Each gear ratio is set to be / s).

As shown in the figure, the input portion a to the cutting portion A and the input portion b to the first transmission mechanism E of the counter shaft 12 are provided.
And a feed transmission device 25 capable of shifting in three high and low stages.
Is provided and can be switched by a manual operation of the switching lever 26. The feed transmission 25 is set to a medium speed position during standard mowing operation, the feed transmission 25 is set to a high speed side in a bad condition such as fallen, and the feed transmission 25 is set to a low speed when the rice is sufficiently dried. It is convenient to change gears according to the situation at the time of cutting stems, such as switching to the side. Further, if the setting device 27 capable of changing and setting the traveling speed of the switching point is connected to the first control device 23, the switching point of the feed chain 4 between the tuned transmission mode and the constant speed transmission mode has a low speed or a high speed. It is also possible to shift to the side and intentionally make a speed difference at the point of synchronization of the transmission form and the switching point at a constant speed.

As shown in FIGS. 3 and 4, the mission 10
Is equipped with a harvesting transmission mechanism H that shifts the engine power that has passed through the HST 8 to several stages of high and low, and outputs it to the harvesting output shaft 8b. It is provided. That is, the first drive gear G ₁ and the second drive gear G ₂ are attached to the output shaft 8a of the HST 8.
Moreover, the first driven gear G ₃ and the second driven gear G ₄ are attached to the cutting output shaft 8b so as to be always meshed with each other in a constantly meshing structure, and are slid on the spline portion of the cutting output shaft 8b. have configured reaper transmission mechanism H is provided an manner the first or second driven gear G _3, dogs 28 to bite into G _4. An output pulley 8p is attached to the reaping output shaft 8b via a one-way clutch 39. A shifter 29 for slidingly operating the dog 28 is supported on the mission case 10k by its shifter shaft 29a, and an output shaft 30a of a geared motor 30 is interlockingly connected to the shifter shaft 29a to form a shift operation means J. The geared motor 30 includes limit switches 30s, 30 for stopping forward rotation and reverse rotation for stopping the motor at the end of the high and low gear shifting.
It is equipped with g. Further, it is convenient to equip a friction transmission mechanism that automatically slips when a load torque exceeding a predetermined value is applied. For reference, FIG. 4 shows the internal structure of the mission 10, in which 40 is an auxiliary transmission unit, 41 is a left and right side clutch, 42 is each crawler drive shaft, and 43 is a meshing clutch that is disengaged with the side clutch 41. Is.

As shown in FIG. 1, in this combine,
Vehicle speed detection means K for detecting the traveling speed of the machine body is also provided. When the traveling speed becomes fast, the harvesting transmission mechanism H is switched to the low speed side, and when the traveling speed becomes slower, the harvesting transmission mechanism H is switched to the high speed side. A second control device (consisting of two relays) 33 that links the vehicle speed detection means K and the geared motor 30 is provided so that the vehicle can be operated. The synchronized gear ratio switching control is automatically performed so as to be faster than that at the time. The vehicle speed detecting means K is composed of a speed change lever 31 for traveling, which operates the HST 8 via a rod 32, and two limit switches 34 and 35. That is,
An arcuate operation plate 36 mounted near the swing axis P of the speed change lever 31 has upper and lower large-diameter portions 36a for contacting the contacts 34a, 35a of the limit switches 34, 35 to operate the switches. , Contactor 34 so that the switch does not operate
a and 35a and a small diameter portion 36b that is not in contact with each other are formed.

The operation of the synchronized gear ratio switching control will be described below.
The shift lever 31 located at the high speed side position (left side in the figure) is swung to the low speed side, and the first limit switch 34 is turned on just at the corner of the upper large diameter portion 36a (state shown in FIG. 1). Then, the geared motor 30 is driven to rotate normally and the dog 28
Is engaged with the second driven gear G ₄ , and the cutting transmission mechanism H is switched to the high speed side. During this deceleration operation, the mowing speed change mechanism H
The vehicle speed at the switching point of is set to 0.7 m / s. Next, when the speed change lever 31 on the low speed side (right side in FIG. 1) is rocked to the high speed side, a portion having a diameter smaller than the angular range α with respect to the rocking axis P between the contactors 34a and 35a. Since the angle range β of 36b is slightly larger (β> α),
After a while after the first limit switch 34 is turned off, the second limit switch 35 is turned on and the geared motor 30 is driven in the reverse direction to move the dog 28 to the first driven gear G ₃
Then, the cutting transmission mechanism H is switched to the low speed side. That is, hysteresis is caused by the angle difference (β> α), and the vehicle speed at the switching point of the harvesting transmission mechanism H during speed-up operation is a value slightly higher than 0.7 m / s (for example, 0.8 m). / s) is set. This hysteresis setting prevents hunting of the control system due to frequent acceleration / deceleration operations near the switching point.

By the way, each of the switches 34 and 35 is biased to the OFF side, and is turned ON until the other switch is turned ON, even if it is turned OFF after ON. Due to harvesting transmission mechanism H
Is controlled so that the gear shift state of is maintained. That is, as shown in FIG. 5, the drive speed of the mowing unit with respect to the vehicle speed passes through line y during deceleration operation and line x during speedup operation.
The hysteresis is set so that it passes through.
In FIG. 1, 37 is a manual switch for artificially switching the cutting transmission mechanism H, 38 is a stock element detection switch equipped near the weeding tool, and the above-mentioned synchronized gear ratio switching control is a stock element switch. It is adapted to operate when 38 is ON and the manual switch 37 is in the "standard" position. When the manual switch 37 is set to the "falling" position, the harvesting speed change mechanism H is switched to the high speed side in preference to the synchronous speed ratio switching control.

[Other Embodiments] The mowing gear change mechanism is configured to have a three-speed gear structure, and the mowing speed is extremely high in extremely low speed work traveling, medium mowing speed in low speed working traveling, and low mowing speed in standard working traveling. The second control device 33 may function. Further, the vehicle speed detecting means K is composed of a speedometer, a belt continuously variable transmission for traveling, and an actuator such as an electric cylinder for gear shifting operation of the belt continuously variable transmission are provided, and a light speed change lever for sending an electric signal is provided. Alternatively, the shift operation means J may be included.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a system diagram showing a circuit structure of tuning gear ratio switching control.

FIG. 2 is a system diagram showing a combine transmission system.

FIG. 3 is a cross-sectional view showing the structure of a harvesting transmission mechanism.

FIG. 4 is a diagram showing the structure of a traveling mission.

FIG. 5 is a diagram showing a relationship graph between a vehicle speed with hysteresis and a mowing speed.

FIG. 6 is a conceptual diagram showing a relationship graph between a vehicle speed and a mowing speed.

[Fig. 7] Side view of conmbine

[Explanation of symbols]

 8 speed change device 33 control device A mowing unit C threshing device H mowing speed change mechanism J speed change operation means K vehicle speed detection means

Claims (1)

[Claims] 1. A cutting unit (A) for cutting planted culms and sequentially transporting the stalks to the threshing unit (C), and the engine power via a transmission (8) for traveling is provided. A combine drive structure configured to be transmitted to the mowing section (A), wherein engine power that has passed through the transmission (8) is shifted to high and low stages and output to the mowing section (A). The harvesting speed change mechanism (H), the speed change operation means (J) for speed-changing the harvesting speed change means, and the vehicle speed detection means (K) for detecting the traveling speed are provided. The vehicle speed detection means (K) and the speed change operation means (K) so that the gear ratio of (1) is switched to the low speed side and the speed ratio of the harvesting transmission mechanism (H) is switched to the high speed side when the traveling speed becomes slow. J) is provided with a control device (33) Vine of the drive structure.