JPH0824456B2 - Work vehicle - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a work vehicle, such as a riding type rice transplanter and an agricultural tractor, in which a ground work device is movably connected to a machine body.

[Conventional technology]

In a riding-type rice transplanter, which is one of the work vehicles, a seedling planting device (corresponding to a ground work device) is connected to a machine body via a link mechanism so as to be vertically movable. And, for example,
As disclosed in Japanese Patent Laid-Open No. 57-154918, when the seedling planting device is largely raised from the rice field, the transmission gear for traveling is automatically decelerated accordingly. is there.

In the riding type rice transplanter, when one planting process is completed and the ridge is reached, the seedling planting device is operated to raise 180 ° at the ridge.
Turn around and enter the next planting process. Therefore, when the seedling planting device is raised at the edge of the ridge, the automatic deceleration as described above facilitates the operation at the edge of the ridge.

[Problems to be Solved by the Invention]

In terms of work efficiency, riding type rice transplanters may raise the seedling planting device after sufficiently approaching the ridges, and may swiftly operate the steering handle to make a turn. In some cases, the raising operation of the seedling planting device and the operation of the control handle may be performed substantially at the same time.

Further, in the disclosed structure, since the link mechanism for raising and lowering the seedling planting device and the speed change device for traveling are mechanically interlocked and coupled via a wire, the seedling planting device can be mounted to a certain degree from the paddy field. Sufficient deceleration will not occur unless it is raised to the height.

Therefore, when the turning operation is started at the same time as the raising operation of the seedling planting device is started at the edge of the ridge, the turning operation is performed without sufficient deceleration in the first half of the turning operation. As a result, the operation of the steering wheel may be delayed in the first half of the turn, and it may be impossible to turn at the ridge.

An object of the present invention is to reduce the delay of the deceleration operation as described above.

[Means for solving the problem]

A feature of the present invention is that the work vehicle as described above is configured as follows. That is, when the ground work device is operated to move upward, the first control means for automatically decelerating the speed change gear for traveling along with the upward operation and the speed change gear based on a command from an operation tool that is artificially operated. The second control means for decelerating to a preset low speed state is provided, and the operation and effect thereof are as follows.

[Action]

For example, in the case of a turn with a relatively large margin in which the ground work device is lifted and then slightly moved and then turned, the first control means automatically decelerates the ground work device as the lift operation is performed. Should be done.

Then, for example, when making a turn after sufficiently approaching the edge of the work site such as a ridge, it is sufficient to operate the operation tool (push switch, lever, etc.) slightly before making a turn, and then make the turn. In this case, since the deceleration operation is performed in advance by the second control means before turning, the safe low speed state is reached at the time when the ground work device is moved up to start turning.

Further, although the second control means requires more operation of the operation tool than the first control means, compared with the case of operating the normal gear shift lever provided in the transmission for traveling to the low speed side. Since it is easier to operate the operation tool for the second control means (push switch, lever, etc.), the operability is not particularly deteriorated.

〔The invention's effect〕

As described above, in addition to the conventional configuration (when the ground work device is lifted, the deceleration operation is automatically linked with this),
By providing the second control means that is easy to operate, the deceleration operation can be performed without delay in any turning state, and stable turning can be performed.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a riding type rice transplanter which is an example of a work vehicle will be described in detail with reference to the drawings.

As shown in FIG. 3, an engine (3) is provided at the front of the body supported by front wheels (1) and rear wheels (2), a control section (4) is provided at the center, and a link mechanism (11) is provided at the rear. A riding type rice transplanter is configured by connecting a planting device (5) (corresponding to a ground work device) so that it can be operated to move up and down. Then, as shown in FIGS. 1 and 3, the power from the engine (3) is transmitted through a belt type continuously variable transmission (6) (corresponding to a traveling transmission) and a gear transmission (7). It is transmitted to the front wheel (1) and the rear wheel (2) and also transmitted to the seedling planting device (5) via the PTO shaft (10).

As shown in FIG. 1, the gear transmission (7) is capable of shifting between two forward gears and one reverse gear, and the first gear shift lever (20).
To change gears. The belt type continuously variable transmission (6) is of a split pulley type and is operated by a tension pulley (19) which is rocked by an electric cylinder (18).

Then, as shown in FIG. 1, a control panel (22) having a control handle (21) is provided with a second speed change lever (23), and a signal from a first potentiometer (8) for detecting the operation position is provided. Is input to the control device (17).
On the other hand, the second potentiometer (9) for detecting the expansion / contraction position of the electric cylinder (18) is attached to the electric cylinder (18), and the signal from the second potentiometer (9) is input to the control device (17). Has been done.

Then, as will be described later, the first of the second speed change lever (23)
The electric cylinder (18) is expanded and contracted so that the output voltage from the potentiometer (8) and the feedback voltage from the second potentiometer (9) of the electric cylinder (18) match. As a result, the second speed change lever (23)
The shifting operation of the belt type continuously variable transmission (6) is performed so as to correspond to the operation position of.

Next, driving-related control will be described. As shown in FIGS. 1 and 2, a main clutch (29) is provided on the gear transmission (7) side in the belt type continuously variable transmission (6), and a clutch for disengaging the main clutch (29). A pedal (30) is provided. A rotation speed sensor (31) for detecting the rotation speed of the engine (3) is attached to the engine (3) side of the belt type continuously variable transmission (6), and the signal thereof is sent to the control device (17). It has been entered.

Then, when starting work or temporarily stopping during planting work, depress the clutch pedal (30) to move the main clutch (2
When you turn off 9), this is the clutch switch (32).
Is detected by As a result, the belt type continuously variable transmission (6) is automatically operated to the lowest speed position. When the clutch pedal (30) is returned to the on position, the belt type continuously variable transmission (6) starts the second speed change from that time (when the main clutch (29) is completely in the engaged state). The speed is slowly increased to the speed corresponding to the operating position of the lever (23). As a result, the aircraft starts to move smoothly (steps (S ₁ ) and (S ₂ )).

As described above, the gear transmission (7) has two forward gears and one reverse gear.
It is a gear shift type, and the first forward speed is for planted running, and the second forward speed is
Speed is for driving on the road. Then, set the first speed change lever (20) for the gear transmission (7) to the first forward speed position (F ₁ ).
When it is operated to, a signal from a forward first speed position switch (not shown) that detects this operation is input to the control device (17). And the operation switch (27) for the seedling planting device (5)
There When being operated in planting position, the process proceeds to step (S ₃₎ (Step _{(S 4), (S 5} )).

As shown in FIG. 1, the control panel (22) is provided with an accelerator lever (33) for operating the accelerator of the engine (3), and it is detected that the accelerator lever (33) is at the fully open position. The accelerator switch (34) is provided. When the accelerator lever (33) is in the fully open position during the above-mentioned planting traveling, the belt type is used so that the engine speed detected by the speed sensor (31) is maintained within the set range. continuously variable transmission (6) is automatically shift operation by the electric cylinder (18) (step (S _6)).

Then, the process proceeds unless the accelerator lever (33) is fully open position from the step (S ₃₎ to step (S _7). As a result, the output voltage from the first potentiometer (8) and the feedback voltage from the second potentiometer (9) match, that is, the speed corresponds to the operation position of the second speed change lever (23). The belt type continuously variable transmission (6) is operated to change gears by the electric cylinder (18).

Furthermore, when the operation switch (27) is operated to a position other than the planting position during traveling with planting (at this time, the planting operation of the seedling planting device (5) is stopped), one planting stroke is performed. Upon completion, it is determined that the aircraft has reached the edge, and the belt type continuously variable transmission (6) is automatically operated to the lowest speed position (steps (S ₄ ), (S ₅ ), (S ₈ ). ) (Corresponding to the first control means).
As a result, the seedling planting device (5) can be swung at a safe low speed while raising the seedling planting device at the edge of the ridge. Then, when the operation switch (27) is moved to the planting position so as to complete the turning and enter the next planting stroke, the step (S ₅ ) and the step (S ₃ ) to the step (S ₆ ) or the step (S ₇ ) are performed. ), The belt type continuously variable transmission (6) is operated to the speed increasing side and returns to the predetermined planting traveling speed.

In this case, since the operating speed of the electric cylinder (18) for operating the belt type continuously variable transmission (6) in steps (S ₆ ) and (S ₇ ) is relatively low, the operation switch (27 ) Is operated to the planting position, the aircraft slowly accelerates to a predetermined planting traveling speed.

The state of the above steps (S ₅ ) and (S ₈ ) is a case where the operation switch (27) is operated to a position other than the planting position and a short time elapses before turning. However, when the raising operation of the seedling planting device (5) and the turning operation by the control handle (21) are performed almost at the same time after sufficiently approaching the ridge, the deceleration operation by the electric cylinder (18) starts the turning. It may not be in time.

In such a case, a push-on push-off type deceleration switch (12) (corresponding to an operating tool) provided on the control panel (22) is pressed to turn it on shortly before reaching the edge. As a result, the belt type continuously variable transmission (6) is decelerated to the lowest speed position by shifting from step (S ₉ ) to step (S ₈ ) (during this time, the seedling planting device (5) operates to plant). Medium) (corresponding to the second control means). When the aircraft reaches the edge, the operation switch (27) is moved to the raised position to raise the seedling planting device (5) (at this time, the planting operation of the seedling planting device (5) is stopped. ), The turning operation is performed by the steering wheel (21).

Then, when the turning on the edge is completed, the deceleration switch (12) is pressed again to turn it off and the operation switch (27) is moved to the planting position, and then step (S ₃ ) to step (S ₆ ) or step (S ₆ ). S ₇₎ and proceeds to the belt type continuously variable transmission (6) is operated in the acceleration side is return to a predetermined planting speed.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a work vehicle according to the present invention, FIG. 1 is a view showing a linked state of each part of a control panel and each device for traveling, FIG. 2 is a flow chart showing a flow of control, FIG. [Fig. 3] is an overall side view of a riding-type rice transplanter. (5) …… Working device, (6) …… Transmission gearbox,
(12) …… Operating tool.

Claims (1)

[Claims] 1. A work vehicle in which a ground work device (5) is vertically movably connected to a machine body, and when the ground work device (5) is operated to be raised, a transmission (6) for traveling is accompanied with this. )
A first control means for automatically decelerating the vehicle, and a second control means for decelerating the transmission device (6) to a preset low speed state based on a command from an operation tool (12) that is artificially operated. A work vehicle equipped with control means.