JPS6018013Y2 - Steering control device for mobile agricultural machinery - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a steering control device for mobile agricultural machinery such as agricultural tractors and combines.

More specifically, the present invention relates to a steering control device that allows manual steering control and automatic steering control to be performed selectively.

Conventionally, this type of steering control has been configured such that manual steering control is performed mechanically and automatic steering control is performed using pressure oil from a hydraulic pump, so the structure is complex and very expensive. Ta.

Further, when the steering is controlled manually, there are problems in that a large operating force is required, and skill is required to quickly and accurately control the steering.

Therefore, the present invention was devised to solve such problems, and its purpose is to make it possible to perform both manual and automatic steering control using pressure oil from a hydraulic pump, and in particular to make manual steering control extremely smooth. This movement can be carried out quickly and accurately, has very good ride comfort during automatic steering control, does not pose any danger to the occupants due to sudden braking, and is simple in structure and can be carried out at low cost. Our goal is to provide steering control devices for agricultural machinery.

Embodiments of the present invention will be described below based on illustrative drawings.

In the figure, reference numeral 1 denotes a 5-point/3-position switching type solenoid valve equipped with an inlet port 11, an outlet port 12, one manual outlet port 13, and two manual outlet ports 14a and 14b. 1 is connected to a hydraulic pump P via a pipe a1.

The solenoid valve 1 operates in response to a signal from a sensor (not shown) installed on the combine harvester.

2a and 2b are inflow ports 21a and 21b, and discharge port 2
2a, 22b as well as outlet port 23a.

23b, 24a, 24b, 25a, 25b, a 5-point/2-position switching type manually operated valve, which is connected to the electromagnetic valve 1 through a pipe line. There is.

In the hydraulic circuit, the solenoid valve 1 becomes a priority circuit for the manually operated valves 2at and 2b, and steering control by the manually operated valves 2a and 2b is possible only when this solenoid valve 1 is in the neutral position. , this manually operated valve 2a on the electric circuit,
2b is configured to be a priority circuit for the solenoid valve 1, that is, the manually operated valves 2a and 2b are connected to the side clutch lever.
26a and 26b, the electromagnetic valve 1 is configured to open an electric circuit to cut off the current supply in conjunction with this operation, and return the electromagnetic valve 1 to the neutral position.

3a, 3b are inflow ports 31a, 31b, 32a, 32
a pilot-operated three-point/two-position switching valve, which is equipped with an output port 33a, 33b, and outlet ports 33a, 33b, the switching valves 3a, 3b extending from the outlet ports 25a, 25b of the manually operated valves 2a, 2b. Manual conduit a2. b2 and the automatic side outlet port 14 at 14 of the solenoid valve 1
Automatic conduit a3 extending from b. b3, and these switching valves 3a, 3b are normally connected to actuators 4a, which will be described later.
4b to the manual pipe line "2?b2", and when pressure oil from the hydraulic pump P is supplied to the automatic pipe lines a3 and b3, this pressure oil switches the switching valves 3a and 3b. , the actuator 4a*4b is connected to the automatic pipe line at b
It is configured to connect to 3.

4a and 4b are actuators that operate side clutches (not shown), and these actuators 4a and 4b are connected to the communication pipe a4. b! It is connected to the switching valve 3at3b via.

The side clutch is interposed in a transmission mechanism between a prime mover and both drive wheels in a combine (not shown), and when the clutch gear of this side clutch is operated and moved, the power transmission to the drive wheels is cut off, and This clutch gear is appropriately pressed against a stationary member to perform braking, and this actuator is connected to the clutch gear of the side clutch.

5 is a main relief valve on the high pressure side, which is connected to the pipe a1 and acts to keep the discharge pressure from the hydraulic pump P constant.

6 is an automatic relief valve on the low pressure side, which is the above-mentioned type IJ.
The pressure is set lower than the set pressure of the IJ-F valve 5, and the automatic pipe line a3. b3 through check valves 6a and 6b, and acts to maintain the oil pressure in the automatic pipes as and b, that is, the oil pressure during automatic control, constant.

Reference numerals 7a and 7b are manual IJ valves on the high pressure side, which are connected to the pipe N and act to maintain the oil pressure in the pipe N constant, that is, the oil pressure during manual control.

The steering control device of the present invention is constructed as described above, and when the direction of movement of a combine harvester running on the road or in a field is manually changed, for example, to the left, the manual operation valve 2a is activated by the side clutch lever 26a. By performing a switching operation, the inflow port 21a is brought into communication with the outlet port 25a.

As a result, pressure oil from the hydraulic pump P passes from the pipe a□ to the solenoid valve 1, to the pipe, and to the actuator 4a on the left side via the manual operation valve 2a, the manual pipe a2, the switching valve 3a, and the continuous pipe a4. The left side clutch is operated by the actuator 4a to cut off the power transmission to the left drive wheel, and also performs braking to change the direction of the combine to the left.

At this time, the pressure oil supplied to the actuator 4a is set to a high pressure by the manual IJ valve 7a, so that the side clutch can be operated quickly and accurately with a large operating force.

Furthermore, when the combine harvester is operated automatically in the field, the electric circuit of the solenoid valve 1 is closed to enable energization.
The sensor on the left side is activated and sends a signal to the solenoid valve 1, and the solenoid valve 1 is operated to make the inflow port 11 communicate with the manual side outlet port 14a.

As a result, the pressure oil from the hydraulic pump P is supplied from the line a1 to the automatic line a3 via the solenoid valve 1, and the pressure oil in this line a3 is used to switch the switching valve 3a.
Since the inflow port 32a is communicated with the outlet port 33a, the pressure oil in the automatic conduit a3M is supplied from the switching valve 3a to the left actuator 4a via the communication conduit a, and the left side actuator 4a is supplied to the left side actuator 4a. The clutch is operated to cut off power transmission to the left drive wheel and apply braking to correct the direction of the combine to the left.

At this time, the pressure oil supplied to the actuator 4a is set to a low pressure by the automatic exclusive relief valve 6, so the braking force is smaller than in the case of manual braking, and the direction of movement of the combine is prevented from changing suddenly. do not have.

During automatic operation control, the side clutch lever 2'6
When manual steering control is performed by operating side clutch lever 26a or 26b, automatic steering control is interrupted in conjunction with the operation of side clutch lever 26a or 26b, and manual steering control is performed as described above. It can be done.

As explained above, the steering control device according to the present invention connects a solenoid valve having a manual side outlet port and an automatic side outlet port to a hydraulic pump, and connects a manually operated valve to this manual side outlet port. A manual pipe line extending from an outlet port of the manually operated valve and an automatic pipe line extending from an automatic side outlet port of the solenoid valve are selectively connected to an actuator for operating a side clutch via a switching valve. Since it is a hydraulic pump, both manual and automatic steering control can be performed using the pressure oil of the hydraulic pump. Therefore, there is no need for mechanical equipment for manual steering control, and one hydraulic pump can be used for manual steering control. , can be shared for automatic use,
The structure is simple and can be implemented at low cost.

In addition, by configuring manual steering control to be performed using pressure oil from a hydraulic pump, this steering control can be performed extremely easily, quickly and accurately, and when automatic steering control is performed, The automatic relief valve allows the pressure oil supplied to the actuator to be set at a low level to prevent sudden changes in the direction of travel due to sudden braking, thereby providing a comfortable ride during automatic steering control and improving passenger safety. There is no danger.

[Brief explanation of drawings]

The drawing is a piping system diagram showing an embodiment of the present invention. P...Hydraulic pump, 1...Solenoid valve, 1
3...Manual side exit port, 14a, 14b...
...Automatic side outlet port, 2ay2b...Manual operation valve, 25a, 25b...Outlet port, 3
at 3 b...Switching valve, 4at4b...
...actuator, a2. b2...Manual conduit, 3rd t b3...Automatic conduit, 5...
...Main IJ IJ-F valve, 6...Automatic dedicated I
J IJ-fu valve.

Claims (1)

[Scope of utility model registration request] An actuator is connected to a side clutch interposed in a transmission mechanism to the drive wheels, pressure oil from a hydraulic pump is supplied to the actuator, the side clutch is operated by the actuator, and power is transmitted to the drive wheels. In a steering control device for a mobile agricultural machine that is designed to shut off the hydraulic pump and control the steering by braking, a solenoid valve having a manual outlet port and an automatic outlet port is connected to the hydraulic pump, and the solenoid valve is connected to the hydraulic pump. Connecting a manually operated valve to the manual side outlet port of the valve, and switching a manual line extending from the manually operated valve outlet port and an automatic line extending from the automatic side outlet port of the solenoid valve to the actuator. The automatic relief valve is connected to the automatic conduit separately from the main relief valve, and the set pressure of the automatic relief valve is set to the main IJ valve. A steering control device for mobile agricultural machinery characterized by setting the pressure to a lower pressure than the pressure.