JPH0576204A - Working unit-control mechanism of running car for working - Google Patents

Abstract

PURPOSE:To make it unnecessary to wire a harness to the working part by attaching a motor and a work amount detector on the running machine body side and connecting the motor through a detachable power transmission mechanism to a working unit-control mechanism. CONSTITUTION:An autohitch mechanism 2 connected to the rear part of a running machine body is equipped with a motor 21 and a rotary encoder 27 is set to the motor. A flexible wire 24 drawn out of a cylinder 20 is connected through clutch wheels 22a and 22b to the motor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working unit control mechanism for a working vehicle such as a tractor.

[0002]

BACKGROUND OF THE INVENTION Generally,
Among the working units connected to the working vehicle such as this type of tractor, a working unit control mechanism that is driven by an electric motor, such as a rear cover movement control mechanism provided in a rotary tillage type working unit, is provided. There is. However, in the past, when the working unit including the working unit control mechanism is connected, it is necessary to wire the harness for the electric motor from the traveling body side to the working unit side. Since there is a risk of bending and breaking, it is necessary to disconnect the harness (coupler part) when exchanging the working part, which is inferior in workability, and if you forget to disconnect it, disconnect the harness. There was an inconvenience that it happened and it became a problem. Further, conventionally, the operation amount of the working unit control mechanism is detected by a stroke sensor or the like assembled to the working unit control mechanism via a link, so it is necessary to separately wire a harness for the sensor to the working unit. Like the above-mentioned electric motor harness, there is a risk of wire breakage, but the increase in the number of parts and complication of the structure were also problems.

[0003]

SUMMARY OF THE INVENTION The present invention was devised with the object of providing a working unit control mechanism for a working vehicle capable of eliminating these drawbacks in view of the above circumstances. The working unit connected to the traveling body,
In a work traveling vehicle provided with a working unit control mechanism that operates based on the drive of an electric motor, an electric motor is disposed on the side of the traveling machine body, and the electric motor is separated by a power transmission mechanism. Connected to the work unit control mechanism,
Further, the traveling machine body is characterized by being provided with an operation amount detecting means for detecting an operation amount of the working unit control mechanism based on detection of rotation of the electric motor. And the present invention is
With this configuration, it is possible to prevent wiring of the sensor harness to the working unit, reliably prevent disconnection of the harness, reduce the number of parts, and simplify the structure. ..

[0004]

An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of a tractor, and a rotary tiller working unit 3 is movably connected to a rear portion of the traveling machine body 1 via an elevating link mechanism (not shown) and an automatic hitch mechanism 2. The working unit 3 moves up and down based on the vertical swing of the lift arm 4 associated with the expansion and contraction operation of the hydraulic cylinder (not shown).

By the way, a top hook 6 pivotally connected to the top end of the top link of the elevating link mechanism is fixed to the central upper end portion of the hitch frame 5 constituting the automatic hitch mechanism 2, and both left and right end portions of the hitch frame 5 are fixed. The lower hooks 7 pivotally connected to the left and right lower links of the lifting link mechanism are fixed to each other, and the working portion 3 is lifted while the top hook 6 is locked to the top mast 8 on the working portion 3 side. Then, the connecting pin 9 on the working portion 3 side is automatically engaged with the lower hook 7 so that the working portion 3 is automatically mounted. Reference numeral 10 denotes a PTO connecting portion provided at the center of the hitch frame 5, and the input side of the PTO connecting portion 10 is connected to the PTO shaft 12 on the traveling machine body 1 side in advance via the universal joint 11. On the other hand, the output side of the PTO coupling unit 10 is automatically coupled to the input shaft 13 on the working unit 3 side with the above-described automatic mounting, and is automatically separated when the working unit 3 is disconnected. Is configured.

On the other hand, in the working part 3, the input shaft 13 is provided with a gear case 14 projecting forward, and the gear case 14
And a tilling claw 16 rotated by power through the chain case 15, a main cover 17 covering an upper part of a rotation track of the tilling claw 16, a rear cover 18 provided behind the main cover 17 and swingable up and down. The pivotal support portion 18a at the base end of the rear cover 18 is a guide member 19 that is movable back and forth along the arc of the main cover 17.
Are integrally connected to.

Reference numeral 20 denotes a pivotally supporting portion 18a of the rear cover 18.
The cylinder 20 is interposed between the top mast 8 and the top mast 8. The cylinder 20 is configured to expand and contract based on the drive of the electric motor 21, and the rear cover 18 is controlled to move based on the expansion and contraction. But
The electric motor 21 is provided in the automatic hitch mechanism 2. That is, on the side of the automatic hitch mechanism 2, the electric motor 21 is arranged so that the motor shaft 21a projects rearward, and the drive side clutch wheel 22a is fixedly mounted on the motor shaft 21a. On the other hand, on the working unit 3 side, A tip end of a flexible wire 24 drawn out from the cylinder 20 is inserted into a guide cylinder 23 provided at a position opposite to the electric motor 21, a driven side clutch wheel 22b is provided, and the driven side clutch wheel 22 is further provided.
B is biased forward by the coil ammunition 25. Then, in the state where the working portion 3 is connected to the automatic hitch mechanism 2, the clutch wheels 22 a and 22 b mesh with each other and the power of the electric motor 21 is changed to the flexible wire 24.
While the power is transmitted to the cylinder 20 via the control unit 3, the power transmission to the cylinder 20 is cut off due to the separation of the clutch wheels 22a and 22b when the working unit 3 is separated. Reference numeral 26 is a contact-type mounting detection switch that is assembled to the electric motor 21 to output an ON signal when the working unit 3 is mounted and to output an OFF signal when the working unit 3 is disconnected.

Further, 27 is a rotary encoder assembled in the electric motor 21, and the rotary encoder 27 is integrally provided in a gear case 21b interposed between the electric motor 21 and the motor shaft 21a. Cage,
The motor rotation is detected based on the motor power input from the gear case 21b, and the detection signal is input to the control unit 28 described later.

Further, 29 is a tilling depth sensor, which detects the tilling depth based on the swing angle of the rear cover 18, which is the electric motor 2.
The automatic hitch mechanism 2 is provided in the same manner as 1. That is, on the automatic hitch mechanism 2 side, the working depth sensor 29 is arranged so that the input shaft 29a projects outward, and the detection lever 30 is fixedly mounted on the input shaft 29a. On the other hand, on the working unit 3 side, A swing arm 32 is pivotally supported by a bracket 31 provided at a position facing the detection lever 30, and the swing arm 32 is connected to an inner wire 33 that is pushed and pulled as the rear cover 18 swings.
When the working portion 3 is connected to the automatic hitch mechanism 2, the bent piece 30a of the detection lever 30 elastically presses the swing arm 32 by the biasing force of the return bullet 34 to change the swing of the rear cover 18. Is transmitted to the working depth sensor 29.

The control unit 28 is constructed by using a so-called micro computer, which is an automatic plowing depth switch 36 for automatically turning on and off the plowing depth automatic control described later. Operating tools such as a plowing depth setting device 37 for setting a target plowing depth in control, a lever angle sensor 38 for detecting an operating angle of a working portion elevating / lowering lever, an arm angle sensor for detecting a swinging angle of the lift arm 4. Three
9. Further, while signals are input from the mounting detection switch 26, the rotary encoder 27, the sensors such as the working depth sensor 29, the lift arm lifting solenoids 40 and 41, the electric motor 21 and the like are judged based on these input signals. The operation signal is output to the. That is, in the control unit 28, the tilling depth automatic control for vertically moving the working unit 3 to match the detection value of the tilling depth sensor 29 with the target tilling depth and the detection position of the rear cover 18 correspond to the target tilling depth. The rear cover movement control for expanding and contracting the cylinder 20 is performed to match the rear cover target position set in advance. The position of the rear cover 18 is detected based on the motor rotation detected by the rotary encoder 27 described above. The rear cover position detection control shown in FIG. 8 will be described below.

First, in the rear cover position detection control, it is judged whether or not it is in the reference value reading mode. If the judgment is YES, the reference value is read. That is, since the position cannot be detected at the beginning of the work, the data read in the fully extended or contracted state of the cylinder 20 is set as the reference value. Then, after the reading of the reference value is completed, it is determined whether or not the mounting detection switch 26 is ON. If this is NO, the data of the rotary encoder 27 is canceled, but if YES is determined. The data of the rotary encoder 27 is input and the rear cover position is calculated based on the input data.

In the embodiment of the present invention constructed as described above, the rear cover 18 which is movable back and forth along the arc of the main cover 17 moves based on the expansion and contraction of the cylinder 20 accompanying the forward and reverse driving of the electric motor 21. Although controlled, the electric motor 21 is disposed in the auto hitch mechanism 2 on the traveling machine body 1 side, and automatically connects with the cylinder 20 as the working unit 3 is mounted on the traveling machine body 1. Becomes Therefore, unlike the prior art in which the electric motor 21 is arranged on the working unit 3 side, wiring on the traveling machine body 1 side is sufficient without wiring the harness for the electric motor 21 to the working unit 3. As a result, the harness is the working unit 3
Permit that it is possible to reliably eliminate the inconvenience of bending and breaking the wire based on the lifting and lowering of the harness, and improve the workability by eliminating the need to disconnect the harness (coupler) when replacing the working part 3. It is also possible to eliminate the disconnection of the harness due to forgetting to remove the coupler.

Further, since the position of the rear cover 18 is detected based on the motor rotation detection of the rotary encoder 27 integrally assembled with the electric motor 21, the position detection sensor such as the stroke sensor is provided on the working unit 3 side. Therefore, it is not necessary to separately provide a wiring harness for the sensor up to the working unit 3 side so that the wire breakage of the harness can be reliably prevented, or the number of parts in the working unit 3 is reduced and the structure is simplified. Can be measured.

Further, in the embodiment, the working depth sensor 2
Since 9 is arranged in the automatic hitch mechanism 2 like the electric motor 21, it is not necessary to wire a harness for the working depth sensor 29 to the working unit 3. As a result, the working depth sensor 29
The inconvenience of the harness for cutting can be eliminated.

[0015]

In summary, since the present invention is constructed as described above, the working unit connected to the traveling body is
Although the working unit control mechanism that operates based on the drive of the electric motor is provided, the working unit control mechanism operates based on the driving of the electric motor that is disposed on the traveling machine body side. That is, it is not necessary to wire a harness for an electric motor to the working unit as in the conventional case in which the electric motor is arranged on the working unit 3 side. It is not possible to reliably prevent the inconvenience that the harness is broken, it is not necessary to disconnect the harness when changing the working part, and further, the harness may be disconnected by forgetting to disconnect it. All inconveniences can be eliminated.

Moreover, the operation amount detection of the working unit control mechanism is
Since it is performed based on the rotation detection of the electric motor provided on the traveling body side, it is not necessary to wire the sensor harness to the working unit side as in the conventional case where the working amount detection sensor is provided on the working unit side. Therefore, it is possible to eliminate all the conventional inconveniences such as cutting of the harness like the electric motor harness, and it is possible to reduce the number of parts in the working unit and simplify the structure.

[Brief description of drawings]

FIG. 1 is a side view of a working unit.

FIG. 2 is a plan view of an essential part showing a working unit separated state.

FIG. 3 is a plan view of an essential part of the same showing a mounting state of a working unit.

FIG. 4 is a side view of an essential part showing a working part separated state.

FIG. 5 is a side view of an essential part of the same showing a work unit mounted state.

FIG. 6 is a side view of the main part of the same showing a cylinder extended state.

FIG. 7 is a block diagram showing an outline of a control mechanism.

FIG. 8 is a flow chart showing rear cover position detection control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traveling machine 2 Auto hitch mechanism 3 Working part 20 Cylinder 21 Electric motor 27 Rotary encoder 28 Control part

Claims (1)

[Claims] 1. A working traveling vehicle in which a working unit control mechanism that operates based on the drive of an electric motor is provided in a working unit connected to a traveling machine body, and an electric motor is provided on the traveling machine body side. , The electric motor is connected to the working unit control mechanism via a power transmission mechanism that can be detached, and the traveling body side further detects the working amount of the working unit control mechanism based on the rotation detection of the electric motor. A working unit control mechanism for a working vehicle, comprising a detecting means.