JPS5837570B2 - Combine harvester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed control device for a combine harvester, and more specifically, it is possible to control the traveling speed of a combine harvester depending on the amount of work load, and to perform the most efficient reaping work according to the load. The present invention relates to a speed control device for a combine harvester.

When operating a combine harvester under automatic control for the purpose of automating harvesting work, simply running it at a constant speed may not be able to fully utilize the processing capacity of the machine, or the overgrown erect grain culms may become overgrown. Depending on the conditions, overload may be applied to the threshing section and other machinery, causing breakdowns.

In particular, in order to automatically control a combine harvester in an unattended state, such inconveniences must be completely avoided.

This invention was made based on the above circumstances, and after selecting and setting the travel speed range of the combine according to the expected work load (reaping, threshing), An object of the present invention is to provide a speed control device for a combine harvester in which the traveling speed of the combine can be automatically controlled by a transmission device.

For this purpose, the present invention provides a plurality of manual speeds in which some of a plurality of gears corresponding to a plurality of preset speeds are arbitrarily selected in a transmission device that switches and controls the traveling speed. To form a switch circuit that passes through one of the changeover switches depending on the workload of the combine, so as to select one of the plurality of gears selected by the changeover switch and the manual speed changeover switch. The present invention is characterized in that the vehicle is equipped with an automatic speed switching means that automatically switches between the two, and a travel speed control range of the transmission is set by the manual speed changeover switch.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In the circuit diagram shown in Figure 1, symbols T and T' are relay switches operated by an automatic stop timer relay provided in the timer circuit. Until the timer relay operates, relay switch T is on and relay switch T' is on. Because it's off,
The energization state of the forward low speed changeover switch L and the forward high speed switch H is controlled via the relay switches D and D'.
When relay switches D and D' are respectively on, they are each held.

In addition, the energization state of the reverse switch B is maintained, but when the travel switching relay provided in the timer circuit is not working, the relay switch TB is on and the relay switch TB is turned on.
is off (the state shown in the figure), the reverse switch B is not energized.

Switch N for unitral position is relay switch T
′ is off, so it is in a cross-sectional state.

The low forward speed and high forward speed switches L and H are the following 1st speed switch F1, 2nd speed switch F2,
A second speed change is made to the third speed switch F3.

At low forward speeds, first and second speeds can be selected, and at high forward speeds, second and third speeds can be selected.

These switches F1, F2, F3, N, and B are incorporated into one switch mechanism by a rotary synchronous switch to be described later.

In this circuit, the symbol d is a relay that is energized when the rotation sensor G detects the engine speed and turns on at a certain speed or above, and by this relay d, the relay switches D and D' are turned on in opposite directions. Can be switched between on and off states.

Therefore, depending on the engine speed, either switch L or H is automatically used.

The switches F1, F2, F3, N and B each have a contact that is electrically connected to the relay SF and a contact that is electrically connected to the relay SH.

When relay SF is excited, switch SF' is turned on and excites solenoid SQL (F), and when relay SB is excited, switch SB' is turned on and solenoid SQL
(B) is excited.

As shown in FIGS. 2 and 3, the rotary synchronous switch includes a rotary contact plate 4 having a plurality of tracks (three tracks in the embodiment) 1, 2, and 3 arranged in a radial direction within a housing 5. The rotating shaft 6 is connected to a rotating lever 7.

The contact plate 4 has partition lines 8 and 8 made of a non-conductive material.
/ is divided into two conductive parts 9 and 9l, and contacts 10, 11 and 12, 10', 11' which press into contact with the contact plate 4 correspond to each track 1, 2, 3.
and 12' are arranged on the insulating substrate 13 within the housing 5.

Then, dividing points 8a, 8 that cross the track of the partition line 8
b and 8c respectively indicate the switching points of the neutral switch N and the switching points of the switches F1 and F2 (F3 is omitted in this embodiment).

Similarly, the dividing point 8a/ of the partition line 8f indicates the switching point of the switch B.

As shown in FIG. 4, the rotating lever 7 has a link γ′.
The control lever 14 is connected to a speed change control lever 14 via a pivot point 15, and the control lever 14 can be pivoted about a pivot point 15.

The control lever 14 is connected via a link 16 to
connected to the rotating lever 18 of the continuously variable transmission 1γ, and
It is linked to the piston rod 20 of the travel speed switching cylinder 19.

This cylinder 19 is connected to a gear pump 22 via a conduit 21, and a spool type solenoid valve 23 is controlled by the solenoids SQL(F) and SQL(B).

Thus, while the timer circuit does not operate the automatic stop timer relay, relay d is energized or deenergized depending on the load on the combine, and relay SF is operated via either switch L or H.

When the piston rod 20 operates under hydraulic control to the cylinder 19, the continuously variable transmission 17 is controlled, and the contact plate 4 is rotated via the lever 7, thereby switching the switch.

When the timer circuit activates the automatic stop timer relay, the relay switch T is turned off and the relay switch T' is turned on, so that when the contact 10 comes into contact with the contact plate 4 at the switching point, the relays SF and SB are activated. is deenergized and the control lever 7 is stopped at the neutral position.

In the above embodiment, the continuously variable transmission 17 is used as a transmission that can change the traveling speed to high or low depending on load fluctuations, but this is not limited to continuously variable transmission.

In addition, as manual speed changeover switches, forward low speed changeover switch L and forward high speed changeover switch H are listed.
Of course, the number of these switches may be three or more, and the number of speed control regions selected thereby may be three or more stages.

Further, although relay switches D and D' are connected in series with the switches L and H as automatic speed switching means, it goes without saying that other configurations may be used as long as they have the same function.

The present invention has been described in detail above, and compared to the conventional method in which the worker controls the traveling speed each time according to the workload, here, the present invention allows the operator to control the traveling speed by using a switch in advance. By simply selecting a gear, the transmission can automatically change the traveling speed within the selected gear according to the work load. The effect is that harvesting work can be achieved using a combine harvester without having to adjust the traveling speed.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIG. 2 is a front view of a rotary switch mechanism, FIG. 3 is a longitudinal side view of the rotary switch mechanism, and FIG. 4 is a schematic side view of the control mechanism. 1, 2, 3... Track, 4... Contact plate, 5...
Housing, 6... Rotating shaft, 7... Rotating lever, 8
, 8'... Compartment line, 8 a? 8 b P 8Ct
8a/-...Divided part, 9, 9l...Conducting part, 10,
11, 12, 10', 11', 12'... contact,
13... Insulating substrate, 14... Control lever, 15...
- Pivot point, 16... Link, 17... Continuously variable transmission, 18... Rotating lever, 19... Cylinder, 20...
...Piston rod, 21...Pipe line, 22...Gear pump, 23...Solenoid valve, T, T'...
Relay switch, L, H...changeover switch, TB, T
B'...Relay switch, N...Switch, B...
・Switch, F1, F2, F3...Switch, G...
・Sensor, 8 relays, D, D'...relay switch,
SF, SB...Relay, SF', SB'-...Relay switch, SQL(F), SQL(B)...
solenoid.

Claims (1)

[Claims] 1. In an apparatus in which the traveling speed is switched and controlled by a transmission, a plurality of manual speed changeover switches for arbitrarily selecting some of a plurality of gears corresponding to a plurality of preset travel speeds, and the manual speed changeover switch described above. automatic speed that automatically switches to form a switching circuit via one of the above transfer switches, depending on the workload of the combine, such that the switch selects one of a plurality of selected gears; What is claimed is: 1. A speed control device for a combine harvester, comprising: switching means, wherein a travel speed control region of the transmission is set by the manual speed changeover switch.