JPS6314624A - Automatic variable speed operation structure of combine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a combine harvester equipped with a control means for automatically accelerating a traveling transmission from a neutral stop state to an artificially selected specified speed change state. This invention relates to an automatic gear shift operation structure.

[Conventional technology]

For combine harvesters that require the operation of the reaping section and other working equipment in addition to the gear change operation while traveling, automatic transmission mechanisms such as those described above are adopted to simplify operation and reduce the burden on the operator. There are models.

At the start of reaping work, if grain culms to be reaped at normal working speeds are suddenly fed into each conveyor system or threshing device, the load acting on each part will rise rapidly, which is not a desirable condition. A restraining means as disclosed in Japanese Patent No. 54-146721 is added to the automatic transmission mechanism, so that when the reaping operation starts, the vehicle travels at a low speed for a set period of time to suppress a sudden increase in the load acting on each part. Research is beginning to be conducted on configuring

[Problem that the invention seeks to solve]

The above-mentioned configuration is effective at the start of the first reaping process for one field, but for example, after one reaping process in which one side of the outer periphery of the planted grain culm group is reaped from end to end is completed. When moving to the next reaping process, in which the machine turns at the headland to change the direction of the machine and reap the other side of the periphery of the planted grain culm group, each conveyance system and threshing device are generally Grain culms are passing or are passing through, and there is little possibility that a sudden increase in load will occur due to sudden feeding of a large amount of grain culms as described above. Therefore, it is undesirable from the point of view of work efficiency if the above-mentioned restraining means acts and the machine runs at a low speed every time it moves on to the next reaping process.

An object of the present invention is to focus on the above-mentioned points and to prevent a decrease in work efficiency while avoiding a sudden increase in load when moving to the next reaping process.

[Means for solving problems]

The feature of the present invention is that in the above-mentioned automatic speed change operation structure of the combine harvester, a grain culm conveyance amount detection device for detecting the conveyance amount of reaped grain culms conveyed per unit time is provided in the conveyance system on the upstream side of the threshing device. It is equipped with a means for storing the conveyance amount at the end of the process detected by the grain culm conveyance amount detecting device at the end of one reaping process, and accelerates to the set low speed state when moving to the next reaping process while accelerating. If the conveyance amount at the start of the process detected by the grain culm conveyance amount detection device at that time is larger than the conveyance amount at the end of the process that was stored at the end of the previous reaping process, the set low speed state is set. The purpose of this is to have a check means that maintains the condition only for a certain period of time, and its functions and effects are as follows.

[For production]

With the configuration described above, when one reaping process is completed and the next reaping process is started, the conveyance amount of the harvested grain culm at the start of the process when reaping is started is the same as the amount at the end of the process at the end of the previous reaping process. If the aircraft accelerates when the load is larger than the conveyance amount, there is a possibility that a sudden increase in load will occur on each part. Therefore, in order to stabilize the load acting on each part, acceleration is only allowed for a set time. After the vehicle is interrupted and travels slowly at the set low speed, it is accelerated to the specified shift state, which is the normal working speed.

On the other hand, if the conveyance amount at the start of the process is smaller than the conveyance amount at the end of the process, there is almost no sudden increase in load even if the machine is accelerated as it is. The work speed is accelerated to .

〔Effect of the invention〕

As described above, when the next reaping process is started, the possibility of a sudden load increase is determined based on the amount of grain culm at the end of the previous reaping process. Automatic acceleration is now interrupted only when there is a sudden increase in load when transitioning to It is now possible to improve.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An agricultural combine harvester which is an embodiment of the present invention will be described below based on the drawings.

As shown in Figure 6, a pair of left and right crawler traveling devices (1
), the front part of the vehicle body (3) equipped with (1) is equipped with a raising device (4), a reaping device (5), and a reaped grain culm conveying device (6).
A reaping pre-processing section (7) is provided which can be raised and lowered freely, and a feed chain (26) for holding and transporting the harvested grain culm from the reaped grain culm conveying device (6) and threshing for the reaped grain culm are provided. The combine is equipped with a threshing device (2) composed of a rotary handling drum (27) and the like.

Next, to explain in detail the power transmission system of the combine harvester, as shown in Fig. 4, the engine (
The power from 8) is branched into a transmission system to the threshing device (2) and a transmission system for driving the traveling and pre-harvesting rings. The latter branched power is transmitted to the input shaft (1) of the traveling transmission case (9).
0) via a tension clutch (11), and is further branched into a traveling system and a reaping pre-processing connection transmission system.

A part of the power from the input shaft (10) is taken out to the PTO shaft (13) via a two-speed high/low gear transmission (12), and from there a tension clutch-type reaping latch (14).
) to the input shaft (15) of the reaping pre-processing section (7). In addition, a part of the power of the input shaft (10) is transmitted to a three-stage sub-transmission device (16), a main transmission device (17) with three forward speeds and one reverse speed, and a steering clutch (18).
The signal is transmitted to the left and right axles (19) and (19) via (1B).

The main transmission (17) includes a multi-plate hydraulic clutch (20a) in the transmission system of a pair of regular gears forming each gear stage.

(20b), (20c), and (20d) are incorporated, respectively, and these hydraulic clutches (20a) and (20b) are assembled.
It is configured as a hydraulically operated traveling transmission that selectively supplies pressure oil to the gears to perform transmission at a desired gear position.

When operating the gear transmission (12) of the reaping pre-treatment link transmission system and the auxiliary transmission (16) of the traveling system, the tension clutch (11) is operated, but the main transmission (17) is operated.
) is operated only by operating a control valve (21) incorporated in the clutch operating hydraulic circuit shown in FIG.

In other words, the control valve (21) is set to (F1), (h), (F1
) and (R), the hydraulic clutch for 1st forward speed (20a), the hydraulic clutch for 2nd forward speed (20b), the hydraulic clutch for 3rd forward speed (20c), and the hydraulic clutch for reverse (20d). By selectively supplying pressurized oil to obtain a gear shifting state of the transmission system in which the clutch is engaged, and by switching the control valve (21) to the (No) position, the fully hydraulic clutches (20a) and (20b)・・・
By removing the pressure oil and cutting off the power transmission, a neutral stopping state can be achieved. Further, an accumulator (22) is connected to the negative side of the control valve (21), and the neutral position 1f (N
The shock of starting is suppressed by suppressing a sudden increase in the clutch operating pressure when the gear is changed from the gear position (o).

Next, we will explain the operation flow of the electric circuit type control device (23), which is one of the control means (23) for automatically operating the control valve (21) via the servo motor (24), with respect to time and the main transmission. Figures 1 and 2 show the relationship between i (17) and the gear shift position.
This will be explained based on the flowchart shown in the figure. The harvested grain culm conveying device (6) is composed of a device that locks and conveys the ear tip side and a device that clamps and conveys the stock end side, and as shown in FIG. It is composed of a chain (28a) with a protrusion and a guide rail (28c) biased by a spring (28b) on the side of the chain (28a).
The feed chain (26) is then transferred to the feed chain (26). A potentiometer (29) is installed, which is a grain culm conveyance amount detection device (29) that detects the retracted position of the guide rail (28c) as a conveyance amount and transmits it to the control device (23). When the reaping process has been completed and the first grain culm sensor (30) with a limit switch installed at the front end of the stock clamping and conveying device (28) is not detecting the presence of grain culms while turning on the headland. The retraction amount of the potentiometer (29) is the transfer amount at the end of the process (V1
) in the control device (23).

When the direction change is completed, as shown by the solid line in Fig. 1, the forward speed 1, which is the set low speed state, is reached in step (S1) in Fig. 2.
During this direction change, all of the grain culms that were harvested in the previous process are transferred from the harvested grain culm conveyor W (6) to the threshing device. (2), where it is threshed. If the first grain culm sensor (30) detects a newly cut grain culm after re-entry, in step (S2), the transport amount at the start of the process (V2), which is the amount of newly cut grain culms, is determined. It is detected by the potentiometer (29). This point is the point (a) shown in FIG.

Then, the conveyance amount at the end of the process (V1) and the conveyance amount at the start of the process (V2) stored in step (S1) are compared, and if the conveyance amount at the end of the process (V+) is larger, the step After the shift interval time (1) is counted in (SL), (SS), and (S6), the process moves to step (S1), and the forward third speed (F1), which is the normal working speed and the specified shift state, is ). This is the state shown by the solid line after time (a) in FIG. Conversely, if the transport amount (V2) at the start of the process is larger, the process moves from step (S1) to step (S1), and the first forward speed (F1) is maintained for only a set time. In other words, when the second grain culm sensor (25), which is installed near the end of the feed chain (26) and detects the presence or absence of a grain culm, detects a newly cut grain culm, the process proceeds from step (b) to step (S4). Then, the speed is accelerated to forward third speed (F3), which is the normal working speed. This is the point in Figure 1 (
This is the state shown by the dashed line shown in a).

[Another example]

In the embodiment described above, a stepped transmission (17) using a plurality of hydraulic clutches was used, but this may be constructed as a hydrostatic continuously variable transmission.

[Brief explanation of drawings]

The drawings show an embodiment of the automatic speed change operation structure for a combine harvester according to the present invention, FIG. 1 is a diagram showing the relationship between time and the speed change position of the main transmission device, FIG. The figure is a plan view of the stock clamping and conveying device, and Figure 4 is a
FIG. 5 is a hydraulic circuit diagram, and FIG. 6 is an overall side view of the combine harvester. (2)... Threshing device, (17)... Transmission device, (23)... Control means, (29)...
... Grain culm conveyance amount detection device, (V+) ...
Conveyance amount at the end of the process, (V2)... Conveyance amount at the start of the process.

Claims (1)

[Claims] An automatic shift operation structure for a combine harvester, which is equipped with a control means (23) for automatically accelerating a traveling transmission (17) from a neutral stop state to an artificially selected designated shift state, the structure comprising: A grain culm conveyance amount detection device (29) that detects the conveyance amount of the harvested grain culm conveyed to the threshing device (
2) A means is provided in the upper conveyance system and stores the conveyance amount at the end of the process (V_1) detected by the grain culm conveyance amount detection device (29) at the end of one reaping process,
When moving to the next reaping process while accelerating, the conveyance amount at the start of the process (V_2) detected by the grain culm conveyance amount detection device (29) when accelerating to the set low speed state is the same as at the end of the previous reaping process. The stored transport amount at the end of the process (V_
1) An automatic speed change operation structure for a combine harvester, which is provided with a check means for maintaining the set low speed state only for a set time when the speed is greater than 1).