JPS6314626A - 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 comprises a control means for automatically accelerating a driving transmission from a neutral stop state to an artificially selected specified speed change state. Regarding the automatic gear shift operation structure of a certain combine harvester.

[Conventional technology]

In recent years, combine harvesters, which require the operator to operate the reaping section and other working equipment in addition to shifting gears while traveling, have adopted automatic gear shifting mechanisms such as those mentioned above to simplify operations and reduce the burden on the operator. Such models are starting to appear.
[Problems to be solved by the invention] When starting reaping and harvesting work, it is necessary to adjust the relative position of the planted grain culm and the reaping section, to perform steering operations for so-called row alignment, and to transport the reaped grain culm. When the aircraft accelerates to normal working speed, or after accelerating to working speed, it rushes into the planted grain culm group, causing a large amount of Since the grain culms of the grain will start to be harvested suddenly, it will be difficult to perform steering operations for row alignment, and sudden loads will be applied to the conveyance system and threshing equipment, resulting in damage to various parts and poor sorting performance. There was a risk that this would lead to a decrease in

Here, an object of the present invention is to focus on the above-mentioned problems and to suppress sudden load increases and declines in sorting performance at the start of reaping and harvesting operations, and to improve operability of row alignment steering operations.

[Means for solving problems]

The feature of the present invention is that in the automatic speed change operation structure of the combined harvester, when the reaping work is started while automatically accelerating to the specified speed change state in a state where the reaping and harvesting work is possible, even when the reaping work is started while the reaping work is automatically accelerated to the specified speed change state, even when the reaping work is started near the exit of the handling chamber of the threshing device. Until the arrival of the grain culm is detected by the grain culm sensor, a check means is provided to check the speed increase beyond the preset low speed state, and its action and effect are as follows. It is.

[For production]

If the above-mentioned restraining means is installed, if an attempt is made to start reaping and harvesting work while accelerating to the specified speed change state, that is, the working speed, the machine will shift to the set low speed state, which is sufficiently slower than the working speed, or to a lower speed. The harvesting operation is carried out at this slow speed until the harvested grain culms are spread throughout the conveying system and the threshing device. Then, after the grain culm sensor detects the presence of grain culms, the speed is accelerated from the set low speed state to the specified speed change state, and the reaping and harvesting work is performed at the normal working speed.

〔Effect of the invention〕

As described above, since the threshing device runs at low speed until the grain culm sensor on the lower side of the threshing device detects the presence of grain culms, the traveling operation for row alignment can be performed easily. In addition, since less grain culm is initially supplied to the conveyance system and the threshing device than during normal operation, the load acting on each part is small, and since the grain culm is distributed to each part of the conveyance system and threshing device. As a result, after the load acting on each part and the sorting action of the threshing device have stabilized to a certain extent, the amount of grain culm used in normal operation is sent to each part, so damage to each part and sorting performance are reduced. There is no risk of deterioration, and it is possible to improve the durability of each part and prevent deterioration of sorting performance at the start of reaping.

〔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 5, a pair of left and right crawler traveling devices (1
), (1) A pre-harvesting processing section (7) consisting of a lifting device (4), a reaping device (5), a harvested grain culm conveying device (6), etc. is installed at the front of the vehicle body (3) equipped with (1). It is provided to be movable up and down, and the receiver from the harvested grain culm conveying device (6) is composed of a feed chain (26) that pinches and conveys the grain culm taken from the harvested grain culm, a rotary handling cylinder (27) that threshes the harvested grain culm, and the like. The combine harvester is equipped with a threshing device (2).

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 pre-harvesting rings. The latter branched power is transmitted to the input shaft (1) of the traveling transmission case (9).
0) through a tension clutch (11), and is further branched into a traveling system and a pre-harvesting ring 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 and low gear transmission (12), from which a tension clutch-type reaping latch (1
4) through the input shaft (15) of the reaping pre-processing section (7);
is transmitted by the belt. In addition, a part of the power of the input shaft (lO) is transmitted to a three-stage auxiliary transmission (16), three forward speeds and one reverse speed.
main transmission (17) and steering clutch (1B),
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-processing ring 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 CP+), (FZ),
By switching to the positions (pi) and (R), the hydraulic clutch for forward 1st speed (20a), the hydraulic clutch for 2nd forward speed (20b), the hydraulic clutch for 3rd forward speed (
20c) and the reverse hydraulic clutch (20d) to obtain a gear shift state of the transmission system with the clutch engaged, and switch the control valve (21) to the (No) position. This means that the fully hydraulic clutch (20a), (
By removing the pressure oil from 20b), the power transmission is cut off, and a neutral stopped state is obtained. Moreover, - of the control valve (21)
An accumulator (22) is connected to the next side, and suppresses a sudden increase in clutch operating pressure when the gear is changed from the neutral position (No), thereby alleviating the shock of starting.

Next, a control means (2) automatically operates the control valve (21).
The flow of operation of the electric circuit type control device (23), which is one of the items 3), will be explained based on the flowcharts of FIGS. 1 and 2 showing the relationship between time and the shift position of the main transmission (17). do. When moving from a stopped state and automatically shifting to the third forward speed (F3) when mowing work is not involved, such as when moving, the control device (23) moves from the servo motor (24) to the servo motor (24) as shown by the solid line in Figure 1. An operation signal is issued, and automatic operation is performed step by step with a shift interval time (t"). This is shown in (s+), (sz), (sz) in Fig. 2.
, (S4.), (ss).

On the other hand, when starting the reaping work, as shown by the dashed line in Fig. 1 and step (Sl) in Fig. 2, after starting at the set low speed state, 1st forward speed (Fl) and accelerating,
From step (S6) to step (S,) in Fig. 2, the forward speed is set at 1st speed (Fl) until the grain culm sensor (25), which is provided at the end of the feed chain (26) or is a mint switch type, detects the presence of grain culms. is maintained.

When the grain culm sensor (25) enters the detection state, the process shifts from step (S,) to step (Ss), and the normal working speed is the designated speed change state, 3rd forward speed (F3).
). This is the point in time (b) shown in Figure 1.
). Thereafter, vehicle speed control is performed based on the workload acting on the engine (8). That is, step (
SS), the rotation speed (m) of the engine (8) is detected, and the rotation speed (m) is the upper limit (m, ) of the appropriate rotation speed range.
If it exceeds step (S,) to step (sh
o) a governor device (not shown) for the engine (8);
is operated to reduce fuel. Further, if the rotation speed (m) of the engine (8) is below the lower limit (mt) of the appropriate rotation speed range, the governor device is operated to increase the fuel from step (S11) to step (St□). .

[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 the drawing]

The drawings show an embodiment of the automatic speed change wet harvesting structure for a combine harvester according to the present invention, FIG. 1 is a diagram showing the relationship between time and the shift position of the main transmission device, FIG. Figure 3 shows the transmission path of transmission and power.
FIG. 4 is a hydraulic circuit diagram, and FIG. 5 is an overall side view of the combine harvester 1. (2)...Threshing device, (17)...Transmission device, (23)...IIi control means, (25
)...Grain culm sensor.

Claims (1)

[Claims] This is an automatic speed change operation structure for a combine 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, and the structure is for reaping and harvesting work. When the reaping work is started while automatically accelerating to the specified speed change state in a state where the culm is possible, the grain culm sensor (25) detects that the grain culm has reached the vicinity of the exit of the handling chamber of the threshing device (2). The automatic shift operation structure of the combine is equipped with a check means to check the speed increase beyond the preset low speed state until the automatic speed change operation structure of the combine is provided.