JPS6317621A - Automatic variable speed operation structure of reaping harvester - 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 reaping machine 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 article relates to an automatic speed change operation structure for a harvester.

[Conventional technology]

In recent years, reaping and harvesting machines, which require the operation of the reaping section and other working devices in addition to the speed change operation while traveling, have adopted the automatic transmission mechanism described above to simplify operation and reduce the burden on the operator. Models that aim to do this are emerging.

[Problem that the invention seeks to solve]

During reaping work, change the cutting height,
In other words, the reaping section is manually or automatically raised and lowered in a timely manner, but when accelerating into a group of planted culms from a state in which reaping and harvesting work can begin, the reaping section cannot be raised or lowered as described above. When this operation is performed, the amount of culms to be harvested per unit time increases, and the cutting height also changes, which causes transportation disturbances in the transportation section after the harvesting section, resulting in an increase in the harvest. There was a possibility that the in-flight post-processing would be adversely affected.

The present invention has focused on the above-mentioned problem, and an object of the present invention is to provide a structure that prevents disturbance of conveyance when the reaping section is raised and lowered during acceleration.

[Means for solving problems]

A feature of the present invention is, in an automatic speed change operation structure for a snow reaping harvester, a check means for temporarily suspending the automatic acceleration operation during the cutting height change operation and for a set time after the cutting height change operation is completed. Its functions and effects are as follows.

[For production]

When equipped with the above-mentioned restraining means, the acceleration operation is interrupted and the vehicle runs at a constant speed while the cutting height is being changed, that is, the reaping section is being raised or lowered, so the cutting height is changed, but the unit time is Since the amount of shell culm that is harvested during the process does not increase, the possibility that transport disturbances will occur is reduced. Furthermore, since the reaping section is not accelerated for the set time even after the reaping section is raised and lowered, even if conveyance disturbance occurs during the reaping section's raising and lowering operation, this conveyance disturbance will not be amplified and will naturally occur during the set time. It disappears, and the conveyance condition becomes stable.

[Effects of the Invention] As described above, it is possible to prevent transport disturbances caused by changing the cutting height during acceleration as much as possible, and also to stabilize the transport state after changing the cutting height. This avoids negative effects on post-processing, and improves the harvest processing efficiency of the reaping harvester.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, an agricultural combine harvester which is one of the embodiments of the present invention will be described based on the drawings.

As shown in Figure 5, a pair of left and right crawler traveling devices (1
), (1) is equipped with a threshing device (2) in the center of the car body (3).
), with a lifting device (4) and a reaping device (5) at the front.
, Reaped culm conveyor! An agricultural combine harvester is constructed by attaching a reaping pre-processing section (7) configured by (6) and the like so that it can be raised and lowered by a single-acting hydraulic cylinder (25).

Next, to explain in detail the power transmission system of the combine harvester, as shown in Fig. 3, the engine (3) mounted on the vehicle body (3)
The power from 8) is branched into a transmission system to the threshing device (2) and a transmission system for driving the traveling and reaping pre-processing parts. 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 power is transmitted to the left and right axles (19) and (19) via (18).

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 performed 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 (P, ), (Ft), (F3
) and (R), the hydraulic clutch for 1st forward speed (20a), 2nd forward hydraulic clutch (20b), 3rd forward hydraulic clutch (20c), and reverse hydraulic clutch (20d) can be selected. By supplying pressure oil all at once, the gear shift state of the transmission system with the clutch engaged can be obtained.
In addition, by switching the control valve (21) to the (N, ) position, the fully hydraulic clutches (20a), (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 f (
This system suppresses the sudden increase in clutch operating pressure when the gear is changed from NO to NO, thereby alleviating the shock of starting the vehicle.

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. (17) will be explained based on the flowcharts of FIGS. 1 and 2 showing the relationship between the shift positions. The reaping pre-processing section (
An ultrasonic sensor (26) is installed in front of the reaping device (5) of 7) to detect the height above the ground of the reaping pre-processing section (7), and the value detected by this ultrasonic sensor (26) is This is input to the control device (23), and based on this detected value, the control device (23) controls a three-position electromagnetic control valve (not shown) that supplies hydraulic oil to the hydraulic cylinder (25). The pre-reaping processing section (7) is also configured to maintain the set height above the ground by issuing an operation signal.

When accelerating into a planted culm group from a stopped state, if the control device (23) does not issue an operation signal to the electromagnetic control valve for the hydraulic cylinder (25), in other words, the cutting height cannot be changed. If not, as shown by the solid line in FIG. 1, automatic gear shifting is performed step by step with a set time (1) up to the third forward speed (F). As shown in Fig. 2, this operation is performed by shifting to first forward speed (Fl) in step (Sl), and then in steps (sz), (S3),
In the loop of (S4), the set time (1) is counted, and the process returns from step (S,) to step (S+), forward 2nd speed (
F2). Similarly, forward 3rd gear (F
3) is operated.

If an operation signal is issued from the control device (23) to the electromagnetic control valve for the hydraulic cylinder (25) during this shift operation, the shift position at the time of the operation signal oscillation is determined in the loop from step (S2) to step (S6). This constant speed state continues until the end of oscillation. For example, if the operation signal is issued at a certain time point (a) after shifting to the first forward speed (Fl), then the oscillation of the operation signal ends at the time point (b) as shown by the dashed line in FIG. ), the first forward speed (Fl) is maintained. At this time, since the count variable (N) is reset to zero in step (S2), after the set time (1) is counted again from the time point (b), the gear shift operation is performed to the next gear shift position. It is going to be done.

[Another example]

In the above-mentioned embodiment, the raising and lowering of the reaping pre-processing section (7) was automatically operated, but the structure may be such that the electromagnetic control valve is manually operated. In this case, the control valve is a hydraulic cylinder (25)
A limit switch is provided on the control valve itself or on the lever for operating the control valve, and the signal from this limit switch is transmitted to the control device ( 23).

Further, the main transmission (17) may be configured as a hydrostatic continuously variable transmission type instead of a stepped transmission type using a plurality of hydraulic clutches.

[Brief explanation of drawings]

The drawings show an embodiment of the automatic speed change operation structure for a reaping 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. 2 is a flow chart showing the flow of operation, Figure 3 is a diagram showing the mission and power transmission path,
FIG. 4 is a hydraulic circuit diagram, and FIG. 5 is a side view of the vicinity of the reaping pretreatment section of the combine harvester. (17)...Transmission, (23)...
Control means, (1)...Setting time.

Claims (1)

[Claims] An automatic speed change operation structure for a reaping harvester, which is equipped with a control means (23) for automatically accelerating a traveling speed change device (17) from a neutral stop state to an artificially selected specified speed change state. An automatic speed change operation structure for a reaping harvester, comprising a check means for temporarily suspending the automatic acceleration operation during a height change operation and for a set time (t) after the end of the cutting height change operation.