JPH0856414A - Tractor for agriculture - Google Patents

Abstract

PURPOSE: To provide a tractor capable of automatically operating a clutch in connected state when a tiller is lowered and preventing connecting operation of the clutch in lowering in inspection, etc. CONSTITUTION: This tractor for agriculture is provided with a controller 30 capable of raising a tiller to the upper limit by operation of a lifting/lowering switch 27, operating a clutch 14 in a connected state, lowering the tiller to operating level only when a vehicle body is traveled and the lifting/lowering switch 27 is re-operated in lowering the tiller kept in the raising state and operating the clutch 14 in connected state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agricultural tractor,
More specifically, the present invention relates to a technique for raising and lowering a rotary tiller.

[0002]

2. Description of the Related Art Conventionally, as a technique for raising and lowering a rotary cultivator, there is one disclosed in Japanese Utility Model Laid-Open No. 60-191113, and in this conventional example, as the rotary cultivator is lifted, the cultivator is powered. The rotation of the PTO shaft that conveys the information is stopped, and the PTO shaft is automatically rotated as the rotary tiller descends. Also, when this rotation stop state continues for a predetermined time or longer, the PTO shaft is stopped. The control system is configured to hold the state.

[0003]

Considering work using a rotary tiller, the rotary tiller is raised to a predetermined level each time the aircraft approaches a ridge during the plowing work, and the aircraft is swung to make a turn. At the end, the working mode is such that the rotary tiller is raised to the working level and the plowing work is started again. In the conventional example, the PTO shaft is driven and stopped as the rotary tiller moves up and down. Since it is performed, it is possible to avoid unnecessary driving of the rotary tiller without performing a special operation.

However, various operations are required in a short time, such as a steering operation as well as an elevating operation of the rotary tiller when the machine is turning, and the operator's operation is as simple as possible when making the turn. It is also desired to make it.

Further, as in the conventional example, after the rotation of the PTO shaft is stopped and a predetermined time elapses, the PTO shaft is not rotated even if the rotary tiller is lowered, for example, the rotary tiller is raised during the work. When the inspection is started in the state where it is allowed to move and the plowing device is lowered during this inspection,
Since the tilling device is not driven if the predetermined time has elapsed, even when the worker is located near the tilling device, the PT
It has a good aspect that the tiller can be moved up and down without checking the disengaged state of the clutch mechanism with respect to the O-axis.

However, in the conventional example, in order to bring out the good surface as described above, it is necessary to set the predetermined time to a relatively short time. With this setting, for example, the machine body approaches a ridge. In this case, the PTO shaft is not driven even when the tiller is lowered in the work in which the headlander is run for a long time while the tiller is being raised and then the plowing work is started again. There is room.

An object of the present invention is to easily raise and lower a rotary tiller, to automatically stop and drive the tiller at the time of raising and lowering, and at the time of inspection with the rotary tiller raised. Even if the rotary tiller is lowered, the tiller is not driven, and if necessary, the rotary tiller is lowered at an arbitrary speed, and the clutch mechanism can be automatically engaged / disengaged at this time. In addition, an agricultural tractor that easily raises the rotary tiller is configured.

[0008]

The features of the present invention (claim 1) are: an actuator for driving and elevating a rotary tiller, a clutch mechanism for connecting and disconnecting the power transmitted from the vehicle body to the rotary tiller, and the operation thereof. The vehicle body is equipped with a lifting operation tool for driving the actuator to raise the rotary tiller to the upper limit position and lowering the rotary tiller at the upper limit position to the working level, and the clutch mechanism is in the engaged state. And, and
When the raising control is performed by the raising / lowering operation tool while the vehicle body is traveling, the clutch mechanism is disengaged together with the raising of the rotary tiller, and after the raising control,
When the descending control is performed by the lifting operation tool while the vehicle body is traveling, there is a control device for performing the engaging operation of the clutch mechanism together with the descending of the rotary tilling device, and its action, And, the effects are as follows.

[0009]

According to the above feature, the rotary tiller can be raised and lowered by operating the lifting / lowering operation tool, and at the time of raising, the clutch mechanism is automatically disengaged so that the drive of the rotary tiller is stopped, and the rotary tiller is lowered. At times, the clutch mechanism is automatically operated to drive the rotary tiller, and even after the rotary tiller is lifted by the lifting operation tool, the clutch mechanism can be lowered even when the elevator tillage tool is lowered when stopped. The clutch mechanism is not operated even if the rotary tiller is lowered by operating another operation system.

That is, by repeatedly operating a single operating tool, the rotary tiller can be moved up and down and the clutch mechanism can be turned on and off to reduce the burden on the operator, and after raising the rotary tiller, a comparison is made. If you are traveling even after a long time has passed, lowering the rotary cultivator with this operation tool will enter and operate the clutch mechanism, and after raising the rotary cultivator with the lifting operation tool, When the work is interrupted and the tiller is inspected, the clutch mechanism is not automatically entered and operated when the rotary tiller is lowered by stopping the vehicle.

According to a second aspect of the present invention, after the raising and lowering operation tool is operated to raise the rotary tiller and the clutch mechanism is automatically disengaged, the position tiller is operated to lower the rotary tiller. In this case, the permitting means permits the clutch mechanism automatic engagement operation only when the descending operation is performed within the predetermined time. In other words, since the position operation tool can set the descending speed of the rotary tiller to any value, it is possible to descend without causing a shock, and the clutch mechanism can be automatically engaged and operated with this descending operation.

Further, according to the third aspect, when the rotary tiller is raised by operating the raising / lowering operation tool, the clutch mechanism is automatically disengaged by the delay means after a predetermined time has elapsed from the raising control. , For example, even when working in a weak field where the wheels of the tractor sink, such as scraping work, the plowing claws are removed from the field when the cultivator is raised, regardless of the level of the vehicle against which the cultivator is working. The plowing claw can be continuously driven until it is separated.

[0013]

As a result, the rotary tiller can be easily moved up and down, and at the time of this up and down, the tiller can be automatically stopped and driven, and at the time of inspection with the rotary tiller raised. An agricultural tractor is configured in which the rotary tiller is not driven even when the rotary tiller is lowered only by stopping the vehicle (claim 1). Further, when necessary, the rotary cultivator is lowered at an arbitrary speed, and an agricultural tractor is configured so that the clutch mechanism can be automatically engaged / disengaged when the rotary tiller is lowered (claim 2). Further, an agricultural tractor is constructed which can comfortably raise the rotary tiller (claim 3).

[0014]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an engine 4 is arranged at the front of a vehicle body 3 having front wheels 1 and rear wheels 2, and a transmission case 5 to which power from the engine 4 is transmitted is attached to the vehicle body 3.
It is arranged at the rear part of the transmission case 5, and at the rear end of the transmission case 5, the front and rear axis X can be freely rolled through the two-point link mechanism 6.
An agricultural tractor is configured by connecting the rotary tiller 7 so that it can be raised and lowered.

Further, a lift cylinder 8 as an actuator is provided on the upper portion of the transmission case 5, and a pair of left and right lift arms 9 and a two-point link mechanism 6 which are moved up and down by the drive of the lift cylinder 8 are provided as a pair of left and right lift rods. 1
And a pair of lift rods 10,
By interposing a double-acting rolling cylinder 11 on one side of 10, the rotary tiller 7 is moved up and down by driving the lift cylinder 8, and the rotary tiller 7 is moved around the axis X by the expansion and contraction operation of the rolling cylinder 11. It is configured to drive rolling (the rolling control system is not described in detail).

The rotary tiller 7 has a large number of plowing pawls 7A which are rotatably driven around a horizontal axis, and a rear cover 7 which is swingably supported at a rear position around the horizontal axis.
B has a potentiometer-type tillage depth sensor 12 for measuring the tillage depth from the swing amount of the cover 7B.
Further, the power from the transmission case 5 is transmitted to the rotary cultivator 7 via the output shaft 13 arranged coaxially with the front and rear axis X, and the power of the output shaft 13 is transmitted to the rotary case 7.
The transmission system is configured so as to be disengaged by a hydraulically operated clutch mechanism 14 built in the.

As shown in FIG. 2, a driver's seat 16 is arranged above the transmission case 5 and between the left and right rear fenders 15, and a main shift for setting the traveling speed to eight speeds is provided on the left side of the driver's seat 16. A lever 17 and a creep lever 18 that greatly reduces the traveling speed by operating from the “H” to the “L” position are provided, and the vehicle body 3 is provided in the vicinity of the steering handle 19 at the front of the driver's seat 16. Forward position "F" to move forward,
A forward-reverse lever 20 that can be switched to a reverse position "R" for moving the vehicle body 3 backward is provided, and the right rear fender 15 is provided.
A control box 21 is provided on the upper surface of the vehicle, and a position lever 22 as a position operation tool is provided on the right side of the driver's seat 16 so as to be swingable around a lateral axis.

As shown in FIG. 3, the control box 21 has a plowing depth setting dial 23 for setting the plowing depth of the rotary tiller 7 during the automatic plowing depth control, and a sensitivity adjusting dial for setting the sensitivity of the automatic plowing depth control. 24, and an automatic switch 25 for selecting an automatic operation mode in which the clutch mechanism 14 is automatically turned on and off as the rotary tiller 7 is moved up and down, and an alarm lamp indicating that the automatic operation mode is released. 26, each of which further includes a ramp 27A as an elevating and lowering operation tool that pushes up the rotary tiller 7 at the working level to the upper limit level, and pushes down again to lower the rotary tiller 7 at the upper level to the working level. A push button type lifting switch 27 is provided.

As shown in FIG. 4, the position lever is configured to be operable in the P range and the Q range, and a potentiometer type lever sensor 28 for measuring the operation amount is provided at the base end portion thereof. As shown in FIG. 1, the lift arm 9
A lift arm sensor 29 for measuring the swing amount is provided at the base end of the
When the position lever 22 is operated in the P range, the lift arm sensor 29 keeps the rotary tiller 7 at the level with respect to the vehicle body set by the lever sensor 28.
The signal from is fed back to control the tiller 7 up and down, and when it is operated in the Q range, automatic tillage depth control is started.
A signal from the tilling depth sensor 12 is fed back so that the rotary tilling device 7 is maintained at the tilling depth set by the tilling depth setting dial 23, and the raising and lowering control of the tilling device 7 is performed.

With this agricultural tractor,
When the clutch mechanism 14 is in the engaged state and the vehicle body 3 is in a traveling state, the ascending / descending control is performed by the ascending / descending switch 27, and then the descending control is performed by operating the ascending / descending switch 27, together with the ascending control. The clutch mechanism 14 is disengaged, and the clutch mechanism 1
A control device 30 for performing the entry operation 4 is provided.

As shown in FIG. 5, the control device 30 has a microprocessor and is constructed.
Is a potentiometer-type setting operated by the working depth sensor 12, the lever sensor 28, the lift arm sensor 29, and the working depth setting dial 23, and a potentiometer type setting is operated by the sensitivity adjusting dial 24. Signals are input from the sensitivity sensor 32, the automatic switch 25, the lift switch 27, and the determination switch mechanism S that determines the state of the speed change system, and the control device 30 controls the solenoid valve 33 that controls the lift cylinder 8. , A solenoid valve 34 for controlling the clutch mechanism 14, an alarm lamp 26,
An output system for each of the lamps 27A built in the lift switch 27 is formed.

Further, as shown in FIG. 6, the discrimination switch mechanism S includes a switch 35 which is turned off when the main transmission lever 17 is in the neutral position "N" as shown in FIG.
ON when the creep lever 18 is in "H" or "L"
By connecting the pair of operated switches 36, 36 and the pair of switches 37, 37 that are turned on when the forward / reverse lever 20 is at the forward movement positions “F” and “R” as shown in the figure. The voltage of the detection path 38 can be used to determine whether the vehicle body 3 is in a traveling state or a stopped state.

The control operation is performed with the clutch mechanism 14 in the engaged state and the rotary tiller 7 at the working level (when the rotary tiller 7 is at the working level for performing automatic tilling depth control as shown in FIG. 1). ), The lifting switch 27 is O
When operated N, as shown in the flowchart of FIG.
The electromagnetic valve 33 is controlled to start the raising of the tiller 7 (steps # 101 and # 102), and the automatic switch 2
5 is in the ON state, the timer (composed of software) is operated only when the traveling state is discriminated by the discrimination switch mechanism S, and the solenoid valve 34 is controlled after the time set in the timer has elapsed. Disengage the clutch mechanism 14 ((#
(Steps 103 to # 107), the tiller 7 is further raised until the lift arm sensor 29 detects that the upper limit is reached. When the automatic switch 25 is OFF or the vehicle body 3 is stopped, the clutch mechanism 14
Only raise the cultivator 7 without turning off (# 10
8, step # 109), and proceeds to the next “A” process.

The delay means F for engaging and disengaging the clutch mechanism 14 after a lapse of a predetermined time from the start of the ascending control in steps # 105 and # 106 is constituted, and the time set by the timer (about 0.6 seconds at maximum) Is for continuing to drive the tilling pawl 7A of the tiller 7 until the tiller 7A of the tiller 7 is completely separated from the field scene when the tiller 7 is raised. The setting value of the plowing depth setting dial 23 and the value of the timer are linked so as to be long,
In addition, when operating the lift switch 27, the built-in lamp 27
Control for turning on A is performed.

The control for raising the tilling device 7 in this way is performed when the vehicle body 3 approaching the ridge is turned, and after the turning is completed in this raised state, the control shown in the flowchart of FIG. As described above (processing of “A”), when the traveling is not stopped, the operation of lowering the tilling device 7 with the position lever 22 is not performed, and the raising / lowering switch 27 is turned on again, the solenoid valve 33 is controlled and the tilling is performed. The descent of the device 7 is started, the solenoid valve 34 is controlled to engage and disengage the clutch mechanism 14, and the cultivating device 7 operates at a working level (a level at which the automatic plowing depth control is started) based on a signal from the plowing depth sensor 12. ), The tiller 7 is lowered (steps # 201 to # 207). When the up / down switch 27 is turned on again, the lamp 27A built in the up / down switch is turned off.

As described above, the reason why the clutch mechanism 14 is allowed to be engaged only when the elevating switch 27 is operated without the operation of lowering the tiller 7 with the position lever 22 while the vehicle is traveling is that the elevating switch is allowed. The operation of the cultivator 7 is stopped while the cultivator 7 is raised at 27.
As in the case of performing the inspection of No. 1, the operator performs the inspection at a position approaching the cultivating device 7, and when the cultivating device 7 is lowered at the time of this inspection, the clutch mechanism 14 is automatically turned on and operated to operate the tillage claw 7A. This is to eliminate the inconvenience caused by the rotation of the.

When it is determined that the vehicle is stopped by the signal from the determination switch mechanism S, the lift switch 27 is turned on.
Unless it is operated and the traveling is not restarted within the set time of about 5 seconds (# 208, # 209 step), the clutch mechanism 14 is not operated even if the tiller 7 is lowered (“C”).
Alternatively, the process of "D" is performed), and further, after the position lever 22 is operated to the upper limit position of the P range, it is not lowered by the lever 22 within a set time of about 5 seconds (#
(Step 209) Even if the tiller 7 is moved down, the clutch mechanism 14 is not operated (“D” is processed).

That is, the elevator switch 27 is in a stopped state.
When is turned on (steps # 201 and # 208), as shown in FIG. 9A (processing of “C”), the descent of the tiller 7 is started and the clutch mechanism 14 is turned on. Instead, the tilling device 7 is lowered until it is determined that the tilling device 7 has reached the working level (the level at which the automatic tilling depth control is started) based on the signal from the tilling depth sensor 12 (# 301 to # 303). Step). After this, the main switch (not shown) is in the ON state, and the clutch mechanism 14 is turned on and operated only when the automatic switch 25 is turned off to return to the control flow of "B"(# 304 to # 3).
06 step).

When the vehicle is stopped, the lift switch 27 is turned on.
When N is not operated and the traveling is not started within the set time (steps # 201, # 208, # 209), FIG.
As shown in (b) (processing of “D”), the alarm lamp 37 blinks, the main switch is in the ON state, and the clutch mechanism 1 is turned on only when the automatic switch 25 is turned off.
4 is turned on and operated (steps # 401 to # 404), and then the elevating switch 27 or the position lever 2
When the cultivator 7 is lowered to the work level by the operation of 2, the flow returns to the control flow of "B"(# 405 step).

Also, in this control system, the tiller 7 is raised by the elevating switch 27, the position lever 22 is operated to the upper limit position of the P range, and then the tiller 7 is lowered.
It is also possible to lower the speed, and since the operation in this form can arbitrarily adjust the descending speed of the tiller 7 by the operating speed of the lever 22, the descending control in this form is also often performed. Therefore, within a short time of about 5 seconds after the position lever 22 is operated to the upper limit position, the automatic engaging operation of the clutch mechanism 14 is allowed only when the lowering control is performed under a certain condition. The control operation is set so that the clutch mechanism 14 is automatically entered and operated only when the lever 22 is operated in the Q range (# 202, # 210, # 204 to # 207 steps).

Also, within a short time of about 5 seconds after the position lever 22 is operated to the upper limit position, the lever 22 is moved to the Q position.
When not operated in the range, as shown in FIG. 9B, the alarm lamp 37 blinks in the same manner as described above (processing of “D”), the main switch is in the ON state, and the automatic switch 25 is OFF. Clutch mechanism 14 only when operated
Switch on and off (steps # 401 to # 404), and then the up / down switch 27 or the position lever 2
When the cultivator 7 is lowered to the work level by the operation of 2, the flow returns to the control flow of "B"(# 405 step).

The permitting means E is constituted by steps # 202 and # 210, and the permitting means E is operated by operating the position lever 22 within a predetermined time after raising the tiller 7 by the elevating switch 27. When is lowered to the work level, it has a function of performing control for permitting automatic engagement / disengagement of the clutch mechanism 14 similarly to the operation of the elevating / lowering switch 27.

In this way, by repeatedly operating the elevating switch 27 as a single operation tool, it is possible to elevate and lower the rotary tiller 7 and open and close the clutch mechanism 14, thereby reducing the burden on the operator and at the same time Cultivator 7
As long as the vehicle continues to travel even after a long time has elapsed after the vehicle is raised, the clutch mechanism 14 can be engaged and operated by lowering the rotary tiller 7 with the lifting switch 27, and the vehicle is stopped for a certain period of time or longer. If or
When the rotary tiller 7 is lowered by the position lever 22 after a certain time or more has passed after the position lever 22 was moved to the raised position, the clutch mechanism 14 is not engaged and, for example, the rotary tiller is in the middle of work. Device 7
Even when the inspection is started in the state of being raised and is lowered during the inspection, the tilling claw 7A of the rotary tiller 7 is not rotated.

When the rotary tiller 7 is raised by the raising / lowering switch 27, the clutch mechanism 14 is automatically disengaged after a lapse of a predetermined time from the start of raising control, so that, for example, the tractor wheel 1, Even when working in a weak field where 2 sinks, the plowing claw 7 is raised when the cultivating device 7 is raised regardless of the level of the cultivating device 7 against the vehicle body.
The plowing claw 7A can be continuously driven until A is separated from the field scene, the driving is not stopped in the state where the plowing claw 7A is thrust into the soil, and the plowing claw 7A is driven when rising. Dispersion of mud by continuing is also eliminated.

[Other Embodiments] In addition to the above embodiments, the present invention is
For example, a sensor for measuring whether the axle is in a rotating state can be provided as a means for determining that the vehicle body is in a stopped state.

Further, the level at which the rotary tiller is raised by operating the elevating switch does not have to be a mechanical operation limit, but may be arbitrarily adjusted.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an overall side view of a tractor.

FIG. 2 is a plan view near the driver's seat of the tractor.

FIG. 3 is a plan view of the control box.

FIG. 4 is a side view showing an operation area of a position lever.

FIG. 5 is a block circuit diagram of a control system.

FIG. 6 is an electric circuit diagram of a discrimination switch mechanism.

FIG. 7 is a flowchart showing a rising control.

FIG. 8 is a flowchart showing main control.

FIG. 9 is a flowchart showing the control of (a) C. (b) The flowchart showing the control of D.

[Explanation of symbols]

 3 Vehicle Body 7 Rotary Tillage Device 8 Actuator 14 Clutch Mechanism 22 Position Operation Tool 27 Elevating Operation Tool 30 Control Device E Allowing Means F Delaying Means

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] January 19, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

[0003]

Considering work using a rotary tiller, the rotary tiller is raised to a predetermined level each time the aircraft approaches a ridge during the plowing work, and the aircraft is swung to make a turn. At the end, the working mode is such that the rotary tiller is lowered to the working level and the plowing work is started again. In the conventional example, the PTO shaft is driven and stopped as the rotary tiller moves up and down. Since it is performed, it is possible to avoid unnecessary driving of the rotary tiller without performing a special operation.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

Claims (3)

[Claims] 1. A clutch mechanism (1) for connecting and disconnecting an actuator (8) for driving and elevating a rotary tiller (7) and a power transmitted from a vehicle body (3) to the rotary tiller (7).
4) and ascending control for driving the actuator (8) by the operation to raise the rotary tiller (7) to the upper limit position, and lowering control for lowering the rotary tiller (7) at the upper limit position to the working level. The vehicle body (3) is provided with an elevating operation tool (27) for performing the above, and the elevating operation tool (2) when the clutch mechanism (14) is in the engaged state.
When the raising control is performed in 7), when the rotary tiller (7) is raised, the clutch mechanism (14) is disengaged, and after the raising control, the vehicle body (3) is running. When the descending control is performed by the elevating operation tool (27), the rotary tiller (7) is descended and the clutch mechanism (14) is engaged, and the elevating operation tool (27) is stopped when the vehicle is stopped. When the descending control is performed with,
A control device (30) for only lowering the rotary tiller (7) without performing an on / off operation of the clutch mechanism (14).
Agricultural tractor equipped with. 2. The rotary tiller (7) when the vehicle body (3) is traveling after the raising and lowering operation tool (27) has been moved up while the clutch mechanism (14) is in the engaged state. ) When the rotary tiller (7) is lowered by operating the position operation tool (22) for arbitrarily setting the level with respect to the vehicle body, it is lowered within a predetermined time from the start of operation of the position operation tool (22). The agricultural tractor according to claim 1, further comprising a permitting means (E) for permitting an automatic engaging operation of the clutch mechanism (14) only when operated. 3. The clutch mechanism (14) after a predetermined time has elapsed from the start of the ascending control, when the ascending / descending operation tool (27) performs ascending control while the clutch mechanism (14) is in an engaged state. 2. The agricultural tractor according to claim 1, further comprising a delaying means (F) for turning off the switch.