JPS593B2 - Combine direction control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a direction control device for a combine harvester that controls the running direction of the machine by operating a running latch and an axle brake by detecting the culm of a direction sensor and by manual operation. .

As part of the automation of harvest work using combine harvesters, an automatic direction control device that automatically controls the running direction of the machine has been developed. To explain this using a schematic diagram, the combine 1 is roughly divided into a reaping section 2, a threshing section 3, and a running section 4, and a direction sensor 5, which is a sensing section of a control device, is installed at the front end of the reaping section 2. It is provided.

When the running direction of the machine is biased to the left, for example, this direction sensor 5 rotates by coming into contact with a culm 6 in the field and closes a microswitch 8 connected to a power source T. Activate solenoid 9. When the solenoid 9 operates, it slides a spool (not shown) in the solenoid valve 10 connected to the solenoid 9, and the hydraulic oil pumped by the hydraulic pump 11 that is operated at the same time is transferred to the solenoid 9.
It is guided to the bush cylinder 12 on the opposite side. This causes the push piston 13 to slide, and the running latch 15 connected to the push piston 13 via the wire 14 is disconnected, thereby decelerating the right axle 16. Further, the wire 14 is connected to a brake (not shown) for the axle 16 that is activated when the running latch 15 is cut off, so that after the axle 16 is decelerated by the running latch 15 being cut off, It is braked by the brake.
Therefore, the machine base turns to the right due to the rotation difference between the left and right axles 16 and 17, and after the direction is corrected, the latch 1 automatically runs.
5 and the brakes are restored to their original state, and the aircraft continues straight ahead. that's all,
I explained the case where the machine's running direction is biased to the left.
The same applies if the position is biased to the right. Further, a clutch pedal 18 is connected to the push piston 13 of the push cylinder 12 via a lever 19.
By operating the clutch pedal 18 with your foot, the latch 15 for driving and the brake can also be operated. Furthermore, the direction control device after the solenoid 9 not only operates automatically when the culm is detected by the direction sensor 5, but also operates manually using a manual lever switch (not shown) provided near the driver's seat 20. It is designed to operate even when it is twisted.

This manual direction control is usually used for times other than harvesting, and in this case it is often necessary to make sharp turns or sudden stops, and for this purpose the brakes must have a large braking force. } must be done. However, during automatic direction control, when the wheels are suddenly braked by the brakes, the machine makes a sharp turn toward the direction correction side, so if the machine continues to run, it will be corrected again in the opposite direction, and this will repeat. If the rock is tilted, the rock becomes meandering, making it impossible to control the direction smoothly. However, in conventional direction control systems, the hydraulic system is common for both manual and automatic systems, making it extremely difficult to adjust the hydraulic pressure in each case. Therefore, it was impossible to satisfy both at the same time.

The present invention has been made in view of the above points, and is provided with a bypass that communicates the push piston with the outside of the push cylinder in the push cylinder that operates the running latch and the brake for the axle. By installing an unload valve on the bypass that opens during automatic control and closes during manual control to control the hydraulic pressure in the push cylinder, the braking force of the brake is weakened during manual control, and the braking force of the brake is fully activated during manual control. The present invention provides a directional control device for a combine harvester that is designed to facilitate directional control.

Hereinafter, its configuration and the like will be explained in detail with reference to embodiments shown in the drawings.

3 to 6 show the direction control device according to the present invention, FIG. 3 is an explanatory diagram of its overall configuration, FIG. 4 is an explanatory diagram of the operation of the running latch and brake, and FIG. 5 is a diagram of the pushbutton. A vertical cross-sectional view of the cylinder and an explanatory view of its operation, and FIG. 6 is an electric and hydraulic circuit diagram.

1 and 2, the buttons in these figures are denoted by the same reference numerals as those in FIGS. 1 and 2 and have the same configuration, so a description thereof will be omitted. In the figure, a side clutch shaft 21 and a wheel Fl 22 are rotatably supported in parallel to the transmission gear box of the machine running section 4.
1 includes a pair of left and right running latches 15 shown in FIG.
Brakes 23 for the pair of left and right axles 22 shown in FIG. 3 are pivotally mounted, and a sprocket 16 on which an endless running roller 24 is stretched is pivotally mounted on the axle 22.
The rotation of the side clutch shaft 21, which is rotated and driven by a drive device (not shown) via a gear device, is transmitted to the axle shaft 22 via the gear device by the connection of the running latch 15. The actuation of the brake 23 causes braking to occur through the gear system. The mechanisms for operating the left and right running latches 15 and brakes 23 are, as shown in an enlarged view in FIG.
A bearing 25 that slidably supports the rod 24 is interposed between the bearing 25 and a spring bearing 25 at the tip of the rod 24.
a compression coil spring 26 that biases the wire 14 in the direction in which the wire 14 is tensioned; a clutch lever 27 that has one end pivoted to the rod 24 and the other end pivoted to the running latch 15; The other end of the brake lever 28 is pivotally connected to the brake 23.

Then, when the wire 14 is pulled against the elastic force of the compression coil spring 26, the clutch lever 27 rotates and the running latch 15 is cut off, and when the clutch lever 27 finishes rotating, the brake lever 28 opens. The brake 23 is activated by rotation. Also, if you loosen the wire 14,
The resiliency of the compression coil spring 26 releases the brake 23, and the latch 15 is then connected. The other ends of the wires 14 for operating the left and right running latches 15 and the brakes 23 are pivotally connected to levers 19 attached to the bases of the left and right clutch pedals 18, and the brake pedals 18 are Tension spring 29
is biased by a rotational force in the clockwise direction in the figure, that is, a tensile force in the same direction as the elastic force of the compression coil spring 26. On the other hand, near the bases of the left and right clutch pedals 18, a pair of left and right bushing cylinders 30, the details of which are shown in FIG.

These bush cylinders 30 are formed into a cylindrical shape.
A refueling port 30a communicating with the solenoid valve 10 is provided at one end thereof. The opening of the oil supply port 30a on the solenoid valve 10 side is opened and closed by the solenoid 9 shown in FIG. 2 sliding a sleeve (not shown) inside the solenoid valve 10 in a direction perpendicular to the plane of the paper. A push piston 31 is slidably fitted into the bush cylinder 30, and the push piston 31 has an annular groove 31a, and the annular groove 31a and the pressure side of the bush piston 31 are connected to each other. Communicating groove 31b
is formed. Moreover, the push piston 31 is
A compression coil spring 32 interposed between the end face and the inner surface of one end of the bush cylinder 30 biases it toward the narrow feeding port 30a side. Further, a bushing rod 33 whose one end is pivotally connected to the lever 19 is slidably supported on the push cylinder 30, and the other end of this push rod 33 is connected to a recess provided in the bush piston 31. 31c, and its tip is pressed against the bottom surface of the concave portion 31c by the tensile force of the tension spring 29. 34 is a hydraulic hose that connects the solenoid valve 10 and the hydraulic pump 11 shown in FIG.

Then, the hydraulic oil is supplied to the bush piston 3 by pressurizing it into the push cylinder 30 from the oil filler port.
1 to disconnect the running latch 15, and then actuate the brake 23. After the push piston 31 has finished disconnecting the running latch 15, the push piston 31 facing the annular groove 31a is moved. The outer wall of the cylinder 30 has a bushing cylinder 30 that opens toward the annular groove 31a.
A bypass 35 is provided to communicate between the oil tank and the external oil tank. In the electrical and hydraulic circuit diagrams in Figure 6, as in the previous figures, 5 is a direction sensor, 7 is a power source, 9 is a solenoid, 10 is a solenoid valve, 30 is a push cylinder, and 35 is a bypass. .

As described above, the solenoid 9 is activated by the detection of the culm by the direction sensor 5, but the machine base is further provided with a manual changeover switch 36, and by switching this, the left and right solenoids 9 are activated. It is designed so that it can be selectively disconnected. Further, an unload valve 38 is provided on the bypass 35 that connects the push cylinder 30 and the oil tank 37, and controls the oil pressure inside the push cylinder by opening and closing the bypass valve. The unload valve 38 is electrically connected to the manual changeover switch 36, and when the manual changeover switch 36 is set to 0N, that is, by manually operating either the left or right solenoid 9, the push cylinder When oil is being supplied to the bush piston 30, it is closed and the oil pressure on the pressure side of the bush piston 31 is maintained at the set pressure. Also, when the manual changeover switch 36 is set to 0FF,
That is, during normal driving and when the direction sensor 5 operates the solenoid 9 to send oil to the push cylinder 30, the push piston 31 opens and releases the hydraulic oil on the pressurizing side of the push piston 31 to the oil tank 37. Pressurization does not occur even if hydraulic oil is injected into the pressure side of the The operation of the direction control device configured as above will be explained.

First, in the case of manual control, for example, in order to make a sudden turn of the machine to the left, when the manual changeover switch 36 is turned to the left to 0N, the right solenoid 9 is activated and hydraulic oil is pressurized into the left bushing cylinder 30. . And bush piston 3
1 slides and the running latch 15 is first disconnected, so that the annular groove 31a of the bush piston 31 faces the opening of the bypass 35, as shown in FIG. 5B. However, in the case of manual control, the unload valve 38 is closed, so the hydraulic oil on the pressurizing side of the push piston 31 is not discharged from the bypass 35, and the push piston 31 continues to slide further. The position shown in Figure 5c is reached. Therefore, a sufficient braking force acts on the axle 22, and the machine makes a sharp turn. Next, in the case of automatic control, for example, when the direction of movement of the machine deviates to the left, the direction sensor 5 detects the culm 6, the left solenoid 9 is activated, and hydraulic oil is pressurized into the right bush cylinder 30. Sanru. Then, the latch 15 on which the push piston 31 slides is first disconnected, and the annular groove 31a of the push piston 31 faces the opening of the bypass 35, as shown in FIG. 5B. In this case, since the manual changeover switch 36 is set to OFF, the unload valve 3
8 is opened and the hydraulic oil on the pressurizing side of the push piston 31 passes through the concave groove 31b and the annular groove 31a to the bypass 35.
is discharged from. Therefore, even if hydraulic oil is pressurized into the push cylinder 30, the push piston 31 will not slide any further, and only a slight braking force will be applied to the axle 22, preventing the machine from turning suddenly. . In Figure 4, A and B represent the rotation range of the clutch lever 27 and brake lever 28 in the case of manual control, and C and D represent the rotation range of the clutch lever 27 and brake lever 28 in the case of automatic control. E is the push piston 3 for manual control and F is the push piston 3 for automatic control.
1 represents the sliding range. As is clear from the above description, according to the present invention, in the directional control device of the combine harvester, the push piston starts to operate the brake for the axle in the push cylinder that operates the running latch and the brake for the axle. A bypass is provided that communicates the pressurized side with the outside of the bushing cylinder when the position is reached, and an unload valve is provided on this bypass to open it in the case of automatic direction control, and to open it in the case of manual direction control. By keeping this closed, the braking force on the axle is automatically weakened during automatic control, which prevents the machine from making repeated sharp turns and meandering, allowing for extremely smooth directional control. Since the oil pressure set by the unload valve does not always fluctuate and the braking force of the brake is always constant, there is no need to adjust the brake, improving work efficiency. Furthermore, during manual control, sufficient braking force is applied to the axle, making it easy to make sudden turns in the rocky platform.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a combine harvester, FIG. 2 is a schematic diagram of an automatic direction control device, FIGS. 3 to 6 show a direction control device for a combine harvester according to the present invention, and FIG. 3 is an overall configuration thereof. Fig. 4 is an explanatory diagram of the operation of the latch wheel and axle brake for running, Fig. 5 is a longitudinal cross-sectional view of the bushing cylinder and an explanatory diagram of its operation, and Fig. 6 is an electrical and hydraulic circuit diagram. . 1... Combine harvester, 5... Direction sensor, 6... Culm, 10... Solenoid valve, 15... Running latch, 23...
・Brake, 30...Button cylinder, 31
...Bush piston, 35...Bypass, 36...Manual switch, 38...
・Unload valve.

Claims (1)

[Claims] 1. Using the direction sensor to detect the grain culm position and the manual switch, hydraulic oil is injected from one end of the push cylinder via the solenoid valve to slide the push piston.
In a combine direction control device that controls the traveling direction of the machine by sequentially operating a traveling clutch connected to the push piston and an axle brake, the push piston slides to disconnect the traveling clutch. a bypass that communicates the pressurizing side of the push cylinder with the outside of the push cylinder at a position after the end of the push cylinder;
An unload valve is provided on the bypass and opens during automatic control by the direction sensor and closes during manual control by the manual switch to control the hydraulic pressure on the pressurizing side of the push piston via the bypass. Combine directional control device.