JPS6368007A - Power take-out control system of tractor - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a power extraction control system for intermittently controlling the power of a power extraction shaft of a tractor, and can be used when a tilling device is attached to perform tractor tilling.

Prior Art and Problems to be Solved by the Invention In a configuration in which the position lever that raises and lowers the lift arm is provided with a switch for engaging and disengaging the clutch of the power take-off shaft that transmits the tilling device, the operating speed of the position lever is is free, so if you raise this position lever quickly, the tilling device may still be in the soil and the clutch on the power take-off shaft may already be in the disengaged state, making it impossible to fully till the soil. There may be no. In addition, when the switch is installed on the lift arm, the clutch release position is fixed at a fixed position, so if the lifting amount of the lift arm is restricted to a low level by specifying the raising position, the lift arm may not reach the switch activation position and the clutch may not disengage.

This invention solves the above problem by always setting the operating position of the clutch of the power take-off shaft at a position lower than the designated raised position of the lift arm.

Means for Solving the Problems This invention provides a lift arm (4) while transmitting power to a working device (2) connected to a vehicle body (1) via a power take-off shaft (3).
and raise and lower the lift arm (4) at the raised position (A) specified by the upper limit setting dial (5).
), and the power is increased with the clutch actuation position (C) determined by subtracting a predetermined value (B') determined according to the designation of this raised position from this designated raised position (A) as the boundary. A tractor power extraction control system is configured in which the clutch (6) of the extraction shaft (3) is manually controlled to disengage.

Effect of the Invention When carrying out tractor work, the lift arm (4) is lowered to position the working device (2) in the soil and the specified work is carried out, and the lift setting dial (5) is set to disable it when not working. Specify the raised position (A) for raising and holding the work position.

This allows you to use the position lever etc. to lift the lift arm (4).
By raising and lowering the lift arm (4), the lifting of the lift arm (4) is automatically stopped at the raised position (A).

When this raised position (A) is designated by the upper limit setting dial (5), a predetermined value (B) corresponding to this designated raised position (A) is determined, and from this raised position (A) to the predetermined value ( B) is subtracted to determine the clutch actuation position (C).

When the operator lowers the lift arm (4) from the raised position (A) to the working position by operating the position lever or the like, or conversely raises it from the working position to the raised position (A), the clutch operating position ( Clutch (6) is engaged when passing C) downward, and is disengaged when passing upward.

Effects of the Invention In this way, the clutch (6) of the power take-off shaft (3) is connected to the lift arm (
4) From the raised position (A), the clutch is engaged and disengaged with the boundary at the clutch operating position (C), which is automatically determined by subtracting a predetermined value (B) determined according to this raised position (A>). Therefore, by setting the predetermined value (B), it is always lower than the specified lifting position (A), and the working equipment (2) is at an appropriate height from the soil surface. Can be set in the appropriate position.

At the rear of the example tractor body (1) is a top link (7).
A tilling device, which is a working device (2), is connected to the lower link (8) so as to be vertically movable, and a rod is connected between the lift arm (4), which is rotated up and down by a hydraulic device, and the lower link (8). (9), and by rotating the lift arm (4), the working device (2) can be raised and lowered between a non-working position at a predetermined height above the soil surface and a working position in the soil.

A position lever C1υ, an upper limit setting dial (5), and a plowing depth setting dial (1, etc.) are provided on one side of the cockpit (11), and by rotating the position lever (11),
The lift arm (4) can be rotated up and down between the raised position (A) set by the upper limit setting dial (5) and the working position (D). A lift arm angle sensor (In) is provided at the base of the lift arm (4) to constantly detect the upward angle of the lift arm (4).

When the working device (2) is a tilling device, a tilling depth sensor (equipped with a leveling device) detects the tilling depth by the vertical movement of a leveling plate A4 that levels the soil surface after tilling.

θe is an A/D converter, and a microcomputer (C
Use the position levers (Iυ, lift arm angle sensor 0, tilling depth selector) to set the tilling depth (D) using the tilling depth setting dial 0~, and to raise the position using the upper limit setting dial +51. (A), etc., the hydraulic circuit of the lift arm (4) has a proportional solenoid valve for lifting (1 force) and a proportional solenoid valve for lowering (Ilm).
, and the solenoid valves (11, etc.) of the hydraulic circuit that turn on and off the power transmission clutch (6) of the power take-off shaft (3).

When lowering the lift arm (4) using the position lever (1υ), operate the vertical operation angle of this position lever (11) to match the angle detected by the lift arm angle sensor (direction). By rotating the position lever (11) downward, the lift arm (4) can be rotated together with the position lever 11D or at a rate slower than the operation speed of the position lever (11).

Tilling depth control is done by setting the tilling depth setting dial 0 to D.
), the tilling work is performed by controlling the lift arm (4) to move up and down so as to follow the standard tilling depth while comparing the tilling depth detected by the tilling depth sensor (Unit).

The predetermined value (B) may be calculated using experimental values or a predetermined calculation formula, and the larger the raised position (A) of the lift arm (4) is, the higher the value is, and conversely, the higher the raised position (A) is, the smaller the raised position (A) is. Set so that the lower the position, the smaller it becomes. Therefore, since it is determined by the clutch actuation position (C) = (A) - (B), which is the reference for disengaging the clutch (6),
By determining the lowest position of this clutch operating position (C) and configuring so that the clutch (6) does not output a disengagement signal below this lowest position, the clutch (6) is The operating position changes according to the specified height of the raised position (A), and even if the specified height of this raised position (A) is low, it will always be lower than the raised position (A) and the latch will operate accurately. (Figure 4).

The horizontal control rod is used to return the lift arm (4) to a position above the clutch actuation position (C). In this case, the working device (2) is provided so as to be able to roll freely relative to the vehicle body (1), and is controlled by a horizontal sensor that detects the horizontal inclination of the vehicle body (1) or the working device (2). raises the working device (2) and returns the working device (2), which is tilted to the left and right with respect to the body (1) beyond the clutch actuation position (C), to a parallel position, brings it to a horizontal state, and then lowers the The following drawings show an embodiment of the present invention: Fig. 1 is a side view, Fig. 2 is a partially enlarged side view, Fig. 3 is a block diagram, and Figs. 4 and 5 are flowcharts. be.

In the figure, (1) is the vehicle body, (2) is the working device, (3) is the power take-off shaft, (4) is the lift arm, (5) is the upper limit setting dial, (6) is the clutch, and (A) is Raised position, (B
) indicates a predetermined value, and (C) indicates a clutch actuation position.

Figure 4 Figure 5

Claims (1)

[Claims] The working device (2) connected to the vehicle body (1) is connected to the power take-off shaft (3).
), the lift arm (4) is raised and lowered by the lift arm (4), and the lifting of the lift arm (4) is stopped at the raised position (A) specified by the upper limit setting dial (5). The power take-off shaft (3
) is a tractor power extraction control system that controls the engagement and disengagement of the clutch (6).