JPS5837810B2 - Speed change device for mobile agricultural machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speed changing device particularly suitable for use in automatic travel control type combine harvesters and the like.

In recent years, automatically controlled combine harvesters have been developed that automatically move and harvest grain culms.

A hydraulic continuously variable transmission is used to control the flight of such an aircraft, and when operating manually, the control lever is operated from the neutral stop position to forward and increase speed, or from the stop position to reverse and increase speed. It ran at variable speeds, and when in automatic operation, the control device operated a hydraulic cylinder and operated a control lever.

A conventional example of a servo switch device used during automatic control operation will be explained with reference to FIGS. 1 and 2.

FIG. 1 shows a circuit diagram, and FIG. 2 shows a structural diagram.

The stop switch A, the reverse switch B1, and the forward switch C constitute a parallel rotary switch, and each switch has a sliding contact a1.
, a2, b, , b2, c1, c2, insulating parts a3, b3, C3 formed between these sliding contacts, and contact contacts a4, b4, c4 in contact with these.

The sliding contacts a1, .
The reverse switch B is provided in the middle thereof, the reverse switch B is provided above it in FIG. 1, and the forward switch C is provided below it.

The sliding contacts a, , b1, c1 are connected in common and are in contact with a contact KF connected to the solenoid SF.

Furthermore, the sliding contacts a2, b2, and c2 are connected in common and are in contact with a contact contact KB connected to the solenoid SB.

Although contact points a4, b4, and c4 are not shown, they are each connected to a controller.

As can be seen from Figure 2, contact points a4, b4, and C4
, KB, and KF are all fixed to the main body 1 of the servo switch, and the sliding contacts a1, . . . are formed by printing a contact plate on an insulating disc 2. , the disc 2 is adapted to rotate relative to the main body 1 about an axis 3.

In such a configuration, when current flows through the forward switch C due to the action of the controller, the solenoid SF-contact point K
Since the circuit of the F-sliding contact C and the one-contact contact c4 is energized, the solenoid SF operates, acting on the cylinder to move the operating lever from the stop position to the forward position.

As will be described in detail later, when the operating lever moves, the shaft 3 of the disc 2 rotates in the direction of the solid arrow.

When the tip of the contact c4 rotates to a position where it touches the insulating part c3, the circuit is cut off, the control lever stops at that position, and the machine runs at a predetermined speed.

At this time, the contact contact a4 of the stop switch A is the sliding contact a2.
Since the solenoid is in contact with the solenoid SB, when current flows through the stop switch A due to the action of the controller, the solenoid SB is energized, which operates the cylinder and moves the operating lever in the opposite direction.

When the contact a4 reaches the position where it contacts the insulating part a3, the current is cut off and the operating lever stops at the stop position, returning to the initial state shown in the figure.

The same operation as described above is also performed when the reverse switch B is operated to move the aircraft backward.

Here, when operating a combine harvester under automatic control, in the conventional combine harvester, the traveling speed of the combine harvester remains almost constant whether moving forward or backward, as described above.

However, in actual fields, it may be necessary to adjust the traveling speed of the machine depending on the growth of grain culms, the moisture content, or the softness of the ground.

In order to change the speed, it is necessary to provide multiple stages of forward switch C and reverse switch B, each of which has a different insulating part position.Furthermore, since these switches are switched by separate switches, the switch mechanism becomes extremely complicated. There was a drawback.

This invention was made in view of the above-mentioned points, and its purpose is to make it possible to manually change the traveling speed of the machine over a wide range during automatic control operation, thereby creating a mobile agricultural machine with good operability. The purpose of this invention is to provide a speed changing device.

Hereinafter, the details of this invention will be explained based on examples.

First, a servo switch used in an embodiment of the speed changing device for a mobile agricultural machine according to the present invention will be described.

FIG. 3 is a circuit diagram of this switch, and FIG. 4 is a structural diagram thereof.

The structure and operation of the main parts are the same as in the example shown in FIGS. 1 and 2, and the same parts are given the same symbols and numbers.

Stop switch A is formed in exactly the same way, but forward switch C and reverse switch B have insulation parts cQ and b3.
% The width of the arc angle is wide.

When automatic control operation is being performed, when a forward signal is issued from the controller, forward switch C is energized and solenoid sF is activated.
works.

Next, the operating levers that operate in conjunction with this will be explained in detail.

FIG. 5 is a configuration diagram showing the operational relationship between the operating lever and each element.

Now, when the solenoid sF operates, the cylinder 4 operates and rotates the operating lever 5 about the fulcrum 6 in the direction of the solid arrow.

As the operating lever 50 rotates, the link 7 operates the continuously variable transmission 8, and the link 9 rotates the shaft 3 of the servo switch.

When the continuously variable transmission device 8 operates, the aircraft starts moving forward.

When the shaft 3 of the servo switch rotates, the disk 2' rotates in the direction of the solid arrow as shown in FIG. 4, and the contact point c4 comes into contact with the insulating portion 03'.

As a result, the energization of the solenoid sF is cut off, the operation of the cylinder 4 is also stopped, and the operating lever 5 remains at the position F1 in FIG. 5.

With the operating lever 5 set in this position, the aircraft continues to travel forward at a constant speed.

Next, when a stop signal is issued from the controller to stop the aircraft, stop switch A is energized, and at this time contact a4
is in contact with sliding contact a2, so solenoid SB operates.

As a result, the cylinder 10 is actuated to rotate the operating lever 5 in the opposite direction of the dotted line arrow, and the continuously variable transmission 8 is activated to reduce speed, and the shaft 2 of the servo switch is rotated in the opposite direction.

When the disc 2' in FIG. 4 rotates in the direction of the dotted arrow and the contact a4 of the stop switch A comes into contact with the insulating part a3, the current is cut off and the solenoid sB becomes inactive and the cylinder 1
0 operation stops.

This position becomes the neutral position of the operating lever 5, and the aircraft stops.

When moving the aircraft backwards, the reverse signal from the controller energizes the reverse switch B and operates the solenoid SB.
As a result, the cylinder 10 is actuated, and the operating lever 5 rotates in the direction of the dotted arrow in FIG. 5 and stops at position B1.
Continue driving backwards at a constant speed.

Each movement is similar to the forward movement.

In addition, FIG. 6 is a control circuit diagram, 11 is the aforementioned controller,
12 is a servo switch including each switch, 13 is a left turn sensor, 14 is a right turn sensor, and 15 is a grain culm sensor.

When there is grain culm to be harvested, the grain culm sensor closes and the machine moves forward while reaping the grain culm.

When the vehicle moves left or right, the left turn sensor 13 or right turn sensor 14 closes and operates the solenoid SL or SR to control the vehicle to move straight in a predetermined direction.

When the aircraft comes to the edge of the field and the grain culm disappears, the grain culm sensor 15
is opened, and the aircraft performs rotation control under the control of the controller 11.

At this time, the forward and backward speeds may be adjusted depending on the field conditions, etc.
Each insulation part 03 of the forward switch C and reverse switch B
When it becomes necessary to increase the speed beyond the constant speed determined by the positions of ' and b3', the driver manually operates the control lever 5 to drive the machine at the desired speed.

The positions of the operating levers 50F1-F2 and B1-B2 shown in FIG. 5 correspond to the widths of the insulation portion C3' of the forward switch C and the insulation portion b3' of the reverse switch B.

Even if the operating lever 5 is operated and the disc 2' of the servo switch rotates, within this range, the sliding contacts C4 and b4 are in contact with the insulating parts c3l and b3', respectively, so they are not energized and automatic gear shifting is performed. No action is taken, and the driver can freely operate the operating lever 5 to change the traveling speed of the aircraft,
Rotation control operations can be performed smoothly.

The above description has been made regarding the case where the accompanying control is performed, but it can also be used when it is desired to artificially increase and vary the speed during general forward running.

As described above, according to the speed changing device for mobile agricultural machinery of the present invention, a servo switch is provided that interlocks with the operating lever, and the servo switch provides the operating lever with an automatic setting range, and furthermore, beyond this automatic setting range, a predetermined manual operation is performed. By providing a width, the driver can freely change the traveling speed according to the field conditions when controlling the rotation of the machine, etc., and has the effect of significantly improving driving operability.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional servo switch device, FIG. 2 is a structural diagram thereof, and FIG. 3 is a circuit diagram of a servo switch device used in an embodiment of the speed changing device for a mobile agricultural machine of the present invention.
FIG. 4 is a structural diagram thereof, FIG. 5 is a configuration diagram showing the operational relationship between the operating lever and each element, and FIG. 6 is a control circuit diagram. A: Stop switch, B: Backward switch, C: Forward switch, a1, a2, b1
', b2', C, ', c2l...Sliding contact, a
3, b! , c3l... Insulation section, a4, b4, c
4, KF, KB...Contact contact, SF, SF...
... Solenoid, 2 ... Disc, 3 ...
・Shaft, 4, 10... Cylinder, 5...
・Operation lever, 6... Fulcrum, 7, 9...
・Link, 8...Continuously variable transmission.

Claims (1)

[Claims] 1. In a speed change device for a mobile agricultural machine that automatically sets a control lever to a predetermined forward or reverse position during automatic control operation and operates a continuously variable transmission to drive forward or backward, the speed change device is interlocked with the control lever. A servo switch is provided, and the servo switch provides the control lever with a central neutral position and an automatic setting range of a forward position and a reverse position in both directions, and further provides a predetermined operating range that allows manual operation beyond this automatic setting range. A speed changing device for a mobile agricultural machine, characterized in that it is provided with: