JPS5819248B2 - Combine harvester with automatic travel speed control mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a first transmission for traveling and a second transmission for traveling that changes the output from the first transmission, and detects the gear change state of the first transmission. The drive mechanism for operating the first transmission is automatically operated based on the detection result of the device that detects the load of the installed threshing device and the detection result of the device that detects the load of the installed threshing device, so that the threshing load value increases based on the detection results of both the detection results. The present invention relates to a combine harvester equipped with an automatic traveling speed control mechanism that maintains a preset control relationship such that the lower the speed is, the lower the speed is.

By carrying out the above traveling speed control, the amount of stalk culm fed per unit time is changed by changing the traveling speed, and as a result, the amount of stalk culm fed into the threshing device is changed.Thus, the threshing load is stabilized. In addition, since the traveling speed is changed to maintain the preset control relationship, for example, if the threshing load deviates from the preset allowable range, the threshing load will be continuously operated until the threshing load returns to within the allowable range. Compared to so-called on/off control that changes the traveling speed, stable control that is less likely to cause knocking or the like can be performed.

In addition, by changing the speed of the second transmission device, it is possible to change the set appropriate traveling speed for the same threshing load value. By changing the speed of the second transmission device in a timely manner according to each field where the load value changes, it is possible to control the state in which the threshing load value reaches the desired appropriate value to be the appropriate state. However, the conventional one has a problem with the means for detecting the gear change state of the first transmission device.

In other words, conventionally, the position of the operating tool that operates the first transmission, or the position of a link in a link mechanism that links the operating tool and the transmission, has been detected using a potentiometer or a stroke sensor. Ta.

This is detected by operating the potentiometer or stroke sensor with an operating tool or link, so if you want to increase the detection accuracy, it is necessary to assemble the potentiometer or stroke sensor in a highly accurate condition. Furthermore, the operating tool and the link mechanism itself must be manufactured with high precision, but if this is to be satisfied, the manufacturing cost will be high.

Moreover, a continuously variable transmission such as a hydraulic type or a belt type is often adopted as the first transmission in order to perform smooth control, but in this case, the transmission efficiency of the continuously variable transmission generally changes due to load fluctuations. For example, even if the assembly accuracy and manufacturing accuracy are improved, it is difficult to improve the detection accuracy, and as a result, it is difficult to improve the control accuracy.

The present invention aims to improve control accuracy by improving the means for detecting the shift state of the first transmission,
In the combine harvester with an automatic traveling speed control mechanism having the above-mentioned structure, the shift state detection device of the first transmission is driven by the output of the first shift gear before being shifted by the second transmission. The apparatus is characterized in that it is configured to detect the rotational speed of a rotating body.

Therefore, the rotating body must rotate reliably in synchronization with the first transmission, and the device for detecting and outputting the speed of the rotating body can be assembled to the rotating body without significantly increasing the assembly accuracy. Since the detection accuracy does not significantly decrease due to its nature, it is possible to accurately detect the gear shift state of the first transmission while reducing the cost compared to the conventional means mentioned above. In fact, it has become possible to improve control accuracy while reducing the cost of the overall structure.

Embodiments of the present invention will be described in detail below with reference to illustrative drawings.

Figure 1 shows the side of the combine harvester, and the front part of the machine, which consists of a pair of left and right crawler running devices 1, 1, a threshing device 2, etc., is equipped with a device 3 for pulling up planted stem culms, and a stem culm stock base. A reaping pre-processing section is connected and equipped, including a reaping device 4 for cutting, a rear conveyance device 5 for conveying the reaped stem culm toward the rear threshing device 2, and the like.

The threshing device 2 is configured to handle and thresh the stem culm with a rotary handling cylinder 7 while pinching and conveying the stem culm with a feed chain 6 installed on the side, and feeds the waste straw after processing to a waste straw cutter 8. is configured for shredding.

Then, as the process progresses, the planted stem culms are raised and reaped,
It is configured to sequentially supply the harvested stem culms to the threshing device 2 for threshing processing.

FIG. 2 shows a schematic perspective view of a power transmission structure to the crawler traveling devices 1, 1 and a traveling speed change operation structure,
, installed engine 9. and a hydraulic continuously variable transmission 10 as a first transmission for traveling are interlocked with a belt, and the continuously variable transmission 10 and an input shaft 12 of a transmission case 11 for traveling are provided in a transmission case 13. They are linked by a gear transmission mechanism.

The continuously variable transmission gear 10 has a transmission arm 10a that is linked via a link mechanism 15 to a first transmission lever 14 that can freely swing back and forth, and the first transmission lever 14 provides zero speed. It is configured such that the more the vehicle is operated forward from the neutral position N, the higher the speed of forward motion is brought about, and the more the vehicle is operated backwards from the neutral position N, the higher the speed of backward motion is brought about.

As shown in FIG. 3, the transmission case 11 for traveling is equipped with a gear transmission 16 as a second transmission for traveling.

This gear transmission 10 is configured to perform three-stage gear shifting by sliding a gear 17, which is integrally formed with three gears of different diameters, dog, medium, and small, in the axial direction.

Further, the transmission arm 16'a of the transmission device 16 is linked via a link mechanism 18 to a transmission lever 17 that swings back and forth, and the transmission is operated by swinging the transmission lever 17 back and forth. It is not configured as much as possible.

Therefore, the traveling speed is changed by the continuously variable transmission 10 and the gear transmission 16 which changes the speed by the output of this transmission 10, and during reaping work, the gear transmission 16 is set to medium speed or low speed. When driving on the road, the gear transmission 16 is shifted to a high rate state. With the gear transmission 16 being shifted in this way, the speed of the continuously variable transmission 10 is set by the continuously variable transmission 10. 1. In FIG. 3, 19.19 is the drive shaft of the two pairs of crawler traveling devices 1, 1, and 20.20 is the state in which the output of the gear transmission 16 is transmitted to the drive shaft 19. This is a pair of left and right steering transmission clutches that can be switched between the two states.

Next, the automatic travel speed control mechanism will be explained.

A torque detection device 21 that detects fluctuations in the driving torque of the handling cylinder 7 as a threshing load, and the traveling mission case 1.
A speed detection device 22 that detects the rotational speed of one input shaft 12 as a speed change state of the continuously variable transmission 10, and an electric motor 23 as a drive mechanism that operates the continuously variable transmission 10 are provided.

The torque detection device 21 will be explained based on FIGS. 4 to 7.

A boss member 25 is fixed to the end of the rotation support shaft 24 of the handling barrel 7, and a pulley 26 receiving power from the engine 9 is loosely fitted and supported around the boss member 250 via a bearing 27. ing.

A coil spring (elastic body) 28 is interposed between the boss member 25 and the pulley 26, so that the power applied to the pulley 26 is transmitted to the shaft 24 via the spring 28. It is composed of

Gears 29 and 30 of the same shape and size are respectively fixed to the pulley 26 and the boss member 25, and each gear 29,
Opposite the circumference of 30.

Detectors 31, 32 are provided which electrically detect the passage of the teeth of both gears 29, 30.

Then, the fluctuation of the driving torque is controlled by the coil spring 2.
8 as a variation in the amount of elastic displacement, and this variation is extracted as a voltage signal based on the phase difference between the pulse signals emitted from both the detectors 31 and 32.

The speed detection device 33 will be explained based on FIG. 8.

A support shaft 40 is provided at the lateral end of the input shaft 12 and is connected and engaged with the input shaft 12 in a relatively unrotatable manner.
is fixed thereto, and a detector 34 that electrically detects passage of the teeth of the gear 33 is attached opposite to the circumferential portion of the gear 330.

Then, fluctuations in the rotational speed of the input shaft 120 are detected as fluctuations in the frequency per unit time of the pulse signal generated by the detector 34, and this fluctuation is extracted as a voltage signal based on the frequency. It is structured as follows.

The electric motor 23 is linked to the swing link 15a in the link mechanism 15' through a worm reduction mechanism 35 and a friction transmission mechanism 36, and operates the continuously variable transmission 10 by forward and reverse operation. It is configured to perform an increase/decrease operation.

The friction transmission mechanism 36 is provided to provide flexibility so that the lever 14 can be operated at will regardless of the operation of the motor 23 in an emergency or the like.
be.

As shown in the block diagram of FIG. 9, the output of the rotational speed detection device 22 and the output of the torque detection device 21 are input to a discrimination circuit 37, and the continuously variable transmission 1
It is configured to compare and determine whether the relationship with the speed change state of 0 is in a preset control relationship such that the speed becomes lower as the threshing load value increases, and based on the determination result of this determination circuit 37. The drive circuit 38a for forward rotation, ie, speed increase, or the drive circuit 38b for reverse rotation, ie, deceleration, of the electric motor 23 is configured to be operated.

Note that each of the drive circuits 38a and 38b and the discrimination circuit 3
Pulse signal generating circuits 39a and 39b for intermittently operating the electric motor 23 are interposed between the electric motor 23 and the electric motor 7.

The control relationship in the discrimination circuit 18 is shown in a graph in FIG.

That is, the horizontal axis shows the threshing load, that is, the detected torque value T, and the vertical axis shows the speed change state of the continuously variable transmission 10, that is, the rotational speed N.
, and So is the control relationship.

Further, Fig. 1'1 shows the relationship between the detected torque value T and the actual controlled running speed V when the gear transmission 16 is switched between a medium speed state and a low speed state, and S, S2 corresponds to the low speed state, and S2 corresponds to the medium speed state.

Therefore, the automatic traveling speed control mechanism increases/decelerates the continuously variable transmission 10 according to fluctuations in the threshing load, increases/decreases the amount of stalks and culms removed per unit time, and automatically stabilizes the threshing load. It will be the core.

Then, the operator changes the gear speed device 16 according to the planting density of the planted stem culm and the wetness of the stem culm, and controls the appropriate state so that the desired appropriate threshing load value is achieved. will be carried out.

In other words, if the planting density of the planted stem culm is higher than the standard, or if the humidity of the stem culm is higher than the standard, the fluctuation of the threshing load with respect to the fluctuation of the running speed will be P1 in the diagram
Since there is a tendency shown by Because of this, the gear must be shifted to medium speed.

In the embodiment, a continuously variable transmission is illustrated as the first transmission 10, but a stepped transmission may also be used.

Further, the rotating body used to detect the speed change state of the first transmission 10 is not limited to the input shaft 12 in the embodiment, but also the rotating body of the first transmission 10 before being shifted by the second transmission 16. Any type of device may be used as long as it is driven by an output.

'Brief explanation of the drawings □ The drawings illustrate embodiments of the combine harvester with an automatic travel speed control mechanism according to the present invention. 3 is a longitudinal sectional front view of the driving transmission case, 4 is a front view showing the attachment part of the torque detection device, 5 is a sectional view taken along the line V-v in 4, and 6 is a A sectional view taken along the line ■-■ in Fig. 4, and Fig. 7 a schematic diagram of the torque detection device.
Fig. 8 is a longitudinal sectional front view of the rotational speed detection device, Fig. 9 is a block diagram, Fig. 10 is a graph showing control relationships, and Fig. 10 is a graph showing control relationships.
FIG. 1 is a graph showing the relationship between the detected torque value and the controlled traveling speed.

・”2...Thresher, 10...
・First transmission, 12...Rotating body, 16...
・Crystal first transmission device, 21...Load detection device, 2
2... Speed change state detection device, 23... Drive mechanism.

Claims (1)

[Scope of Claims] 1. A first transmission 10 for traveling and a second transmission 16 for traveling that changes the output from the first transmission 10 are provided, and the gear change state of the first transmission 10 is detected. The first transmission device 1
1, which operates the threshing load value, automatically operates the drive mechanism 23 to maintain the above-mentioned detection results in a preset control relationship such that the higher the threshing load value is, the lower the speed change state is. The combine harvester is equipped with a travel speed control mechanism, and the shift state detection device 22 of the first transmission 10 is driven by the output of the first transmission 10 before being shifted by the second transmission 16. Rotating body 12
A combine harvester with an automatic travel speed control mechanism, characterized in that it is configured to detect zero rotation speed. 2. The combine harvester with an automatic traveling speed control mechanism according to claim 1, wherein the first transmission 10 is a hydraulic continuously variable transmission.