JPS5941950Y2 - Combine harvester with automatic travel speed control mechanism - Google Patents

Description

[Detailed description of the invention] The present invention is designed to interlock and connect a drive device for automatic speed change operation that operates based on the detection result of the threshing load and a speed change operation mechanism of the continuously variable transmission for traveling. The present invention relates to a combine harvester with an automatic travel speed control mechanism configured to automatically and reversibly change the travel speed based on fluctuations.

According to this type of combine harvester, by automatically controlling the traveling speed according to the threshing load, the amount of stem culm reaped per unit time is controlled, and as a result, the amount of stem culms fed to the threshing device per unit time is controlled. This makes it possible to perform efficient threshing work by fully utilizing the allowable capacity while stabilizing the threshing load.

Furthermore, in carrying out the above-mentioned automatic control, when the continuously variable transmission is operated to the high speed limit, it is necessary to stop the operation of the drive device for automatic transmission operation. , an electric switch is provided that is pressed by contact with a gear shift lever of the continuously variable transmission which is displaced as the continuously variable transmission is operated by a drive device for automatic transmission operation.

A suppressing operation is performed by contact with a member that moves in conjunction with the operation of the continuously variable transmission, such as stopping the drive device for automatic transmission operation based on the electric signal from this switch. Since this was done using an electric switch, there were the following problems.

In other words, it is extremely difficult to assemble the electric switch without error so that when the continuously variable transmission is operated to its high speed limit, the electric switch is simultaneously suppressed. If the electric switch is operated before it is operated to its limit, the aircraft's capabilities will not be fully utilized, and even if the continuously variable speed control device is operated to its high speed limit, the electric switch may If the automatic transmission is not operated, there is a risk that the drive device for automatic transmission operation will continue to operate, causing trouble such as damage to the continuously variable transmission.

As described above, an object of the present invention is to provide a combine harvester with an automatic travel speed control mechanism, which is equipped with an electric switch for detecting the limit position of the high speed side of the continuously variable transmission, and to provide a combine harvester with an automatic travel speed control mechanism. The object of the present invention is to devise a simple structural improvement so that the electric switch and the continuously variable transmission are not damaged and the functions of the continuously variable transmission can be fully demonstrated.

The characteristic structure of the present invention, which is a distant relative of the above object, is as follows:
In the combine harvester with an automatic traveling speed control mechanism having the above structure, the speed change operation mechanism absorbs the operation to the high speed side by the drive device when the continuously variable transmission is at the limit position of the high speed side. an elastic accommodation mechanism is interposed therebetween, and the range of action of the elastic accommodation mechanism on the continuously variable transmission is such that the electric switch and the speed change operating tool are in contact with each other in a state where the absorption action by the elastic accommodation mechanism is exerted. and the location of the electric switch relative to the gear shift operating tool are set, and this configuration provides the following effects.

In other words, when the continuously variable transmission is operated beyond its high-speed limit, the drive device for automatic gear shift operation is attempted to be stopped as long as the elastic accommodating mechanism that absorbs the gear shift operation is in operation. Therefore, as the continuously variable transmission is operated to its high speed limit, the drive device for automatic transmission operation can be reliably stopped, and in order to achieve the same purpose as the present invention, the continuously variable transmission itself This can be implemented at a lower cost and more easily than using other structures, such as improving the structure so that after being operated to the high-speed girth limit position, it is not operated by an appropriate amount at that speed.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

The figure shows a threshing device 2, an engine 3. A moving device 5. A combine harvester is shown in which a reaping pre-processing section consisting of a reaping device 6, a vertical conveying device 1, etc. is connected, and while traveling, the culm to be planted is raised and harvested, and vertically conveyed to feed the rear threshing device 2. The grain is delivered to a feed chain 8, and the stalks are held and conveyed by the feed chain 8, and the tips of the stalks are handled and threshed by a handling drum 9 (see FIG. 2).

As shown in FIG. 2, the crawler traveling device 1 is driven by an output from a continuously variable transmission device 10 that is configured using a variable hydraulic pump or the like that is linked to the engine 3.

Further, a transmission shaft 11 extending from the continuously variable transmission device 10 to the reaping pretreatment section is mounted on a protruding shaft, and the crawler traveling device 1
and the reaping pre-processing section are configured to be changed in speed at the same time.

The continuously variable transmission 10 is exposed on the side of the case of the continuously variable transmission 10 via a speed change operation mechanism 14 that includes a swing lever 12 as a speed change operation tool that is pivotally mounted near the pilot seat 4. The gear shift arm 13 is configured to change gears as the swinging shift arm 13 is pivoted.

In addition, this combine harvester has an automatic running speed control mechanism, which will be described below, to control the running speed according to the increase in the load on the handling barrel 9, thereby stabilizing the load and enabling efficient work. is equipped with.

That is, an electric motor 16 as a drive device for automatic speed change operation is interlocked and connected to the swing link 14a interposed in the speed change operation mechanism 14 via a friction transmission mechanism 15. It is connected to a comparison mechanism 11.

This comparison mechanism 17 includes a rotary support shaft 1 that supports the handling cylinder 9.
The device 19 for electrically detecting the torque of No. 8 is compared with the electric signals transmitted from the angle detecting device 20, and the change in the value of the electric signal from the torque detecting device 19, that is, the amount of increase in threshing load. and the signal value set corresponding to the threshing load value and the angle detection device 2.
It has the two functions of comparing the signal value transmitted from the angle detector 20 with the signal value transmitted from the angle detector 20 until the signal value transmitted from the angle detector 20 reaches the required setting value according to the change in the electric signal value of the torque detector 19. , is configured to issue a control command signal for operating the electric motor 16 in forward and reverse directions.

Therefore, speed control is performed to automatically and reversibly change the traveling speed in response to fluctuations in the threshing load based on a preset inverse proportional relationship in accordance with the threshing load value. Through this control, the traveling speed is controlled in response to fluctuations in the threshing load, and as a result, efficient reaping traveling work is performed while stabilizing the threshing load.

Further, the traveling speed control mechanism includes the continuously variable transmission 1.
A mechanism is incorporated to automatically and reversibly stop the operation of the electric motor 16 when the motor is operated to the high speed limit, and this will be explained below.

That is, in the interlocking mechanism between the continuously variable transmission 10 and the electric motor 16, that is, in the shift operation mechanism 14, the first
An elastic accommodation mechanism 21 is interposed between the zero end 14b and the twentieth end 14c.

This elastic accommodating mechanism 21 has a first member 22 fixed to the tenth arm 14b, a second member 23 fixed to the twentieth arm 14c, and the swing speed change arm 13 is connected to the operating reaction force of the hydraulic motor. The system is constructed by interposing a spring 24 having a large enough biasing force to catch and support the attempt to return to the low speed side due to the continuous variable transmission 10 reaching the high speed limit. When the oscillating speed change arm 13 is prevented from oscillating at a higher speed, the spring 24 is shortened and the accommodating absorption operation is performed.

On the other hand, the guide frame 25 of the swinging lever 12 is further provided with the accommodating and absorbing action of the accommodating mechanism 21 by the subsequent operation of the electric motor 16 after the continuously variable transmission 10 is operated at high speed. An electric switch 26 is provided that is operated in contact with the swing lever 12 that is operated to the high speed side.

This switch 26 detects that the accommodation mechanism 21 is operating when the contact operation is performed, and causes the comparison mechanism 17 to stop the operation of the electric motor 16 only while the contact operation is performed. is configured to provide a signal.

In other words, this stopping mechanism stops the electric motor 16 only while the accommodation mechanism 21 is operating.

[Brief explanation of drawings]

The drawings show an embodiment of a combine harvester with an automatic traveling speed control mechanism according to the present invention, and FIG. 1 is a side view of the combine harvester, and FIG. 2 is a side view of the combine harvester.
The figure is a perspective view of the automatic travel speed control mechanism, and FIG. 3 is a longitudinal sectional side view of the elastic accommodation mechanism. 10...Continuously variable transmission for driving, 12...
・Speed shift operation tool, 14...Speed shift operation mechanism, 16.
... Drive device, 21 ... Elastic accommodation mechanism,
26...Electric switch.

Claims (1)

[Scope of utility model registration request] The drive device 16 for automatic speed change operation, which operates based on the detection result of the threshing load, is interlocked with the speed change operation mechanism 14 of the continuously variable transmission device 10 for traveling, so that the traveling speed can be automatically adjusted based on fluctuations in the threshing load. In addition, the gear change operation mechanism 14 is configured to be configured to change speed reversibly, and the gear change operation mechanism 14 is configured to come into contact with a gear change operation tool 12 for the continuously variable transmission 10 to bring the continuously variable transmission 10 to a high speed limit position. An electric switch 26 is provided to detect whether the electric switch 26 is being operated.
In the combine harvester with an automatic travel speed control mechanism configured to stop the operation of the drive device 16 in accordance with the detection operation of the continuously variable transmission 10 in the speed change operation mechanism 14,
the drive device 16 in a state where it is at the limit position of the high speed side.
An elastic accommodating mechanism 21 is interposed to absorb even higher-speed lateral operation, and the electric switch 26 and the gear shift operating tool 12 come into contact with each other while the elastic accommodating mechanism 21 is exerting its absorption action. A combine harvester with an automatic running speed control mechanism, characterized in that the operating range of the elastic accommodation mechanism 21 with respect to the continuously variable transmission 10 and the arrangement position of the electric switch 26 with respect to the speed change operating tool 12 are set as follows.