JPH03210102A - Working vehicle - Google Patents

Abstract

PURPOSE:To stabilize rotation of working vehicle by equipping the working vehicle with a first controlling means of automatically operating speed reduction of a traveling speed change gear with rising operation of a ground working device when the device is operated to rise and with a second controlling means of operating speed reduction of the speed change gear to a preset low-speed state based on an order from an artificially operated handling tool. CONSTITUTION:In the case of rotation having relative time spare wherein a ground working device is operated to rise, then traveled a little and rotated, a speed change gear 6 is automatically operated to reduce speed with rising operation of the ground working device by a first controlling means 17. When the ground working device sufficiently approaches working land such as a levee side and is turned, a handling tool 12 is operated a little before rotation and the ground working device is revolved. In this case, since speed reduction operation of the speed change gear 6 is carried out by a second controlling means 17 before the rotation, the ground working device is completely in a low-speed state at a point when the device is operated to rise and starts to turn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a working vehicle, such as a riding rice transplanter or an agricultural tractor, in which a ground working device is connected to the body of the vehicle so as to be able to move up and down.

[Conventional technology]

In a riding type rice transplanter, which is one type of work vehicle, a seedling planting device (equivalent to a ground work device) is connected to the machine body via a link mechanism so that it can be raised and lowered. For example, as disclosed in Japanese Utility Model Application Publication No. 57-154918, when the seedling planting device is raised significantly from the field surface, the transmission for traveling is automatically decelerated accordingly. There are things that make up.

In a riding type rice transplanter, when one planting process is completed and the rice seedlings reach the ridge edge, the seedling planting device is raised and raised to 180° at the ridge edge.
Turn around and start the next planting process. Therefore, when the seedling planting device is raised at the edge of a ridge, automatic deceleration as described above is performed, making the operation at the edge of the ridge easier.

[Problem to be solved by the invention]

In terms of work efficiency, with a riding rice transplanter, the seedling planting device may be raised sufficiently close to the ridge, and the machine may be rotated by quickly operating the steering wheel. In some cases, the raising operation of the seedling planting device and the operation of the control knob may be performed substantially simultaneously.

In addition, in the disclosed structure, the link mechanism for raising and lowering the seedling planting device and the transmission for traveling are mechanically interlocked via wires, so the seedling planting device can be moved a certain distance from the field surface. Sufficient deceleration will not occur unless the vehicle is raised to a certain height.

Therefore, if the turning is started substantially at the same time as the lifting operation of the seedling planting device is started at the edge of the ridge, the turning will be performed without sufficient deceleration being performed in the first half of the turning.

As a result, the operation of the control handle may be delayed during the first half of the turn, resulting in a situation where the vehicle cannot turn at the edge of the ridge.

Here, an object of the present invention is to provide a structure that reduces the delay in deceleration operation as described above.

[Means to solve the problem]

The feature of the present invention is that the above-mentioned work vehicle is constructed as follows. In other words, when the ground work device is raised, the first control means automatically decelerates the traveling transmission in accordance with this, and the transmission is activated based on a command from the manually operated operating tool. The second control means is provided for decelerating the vehicle to a preset low speed state, and its functions and effects are as follows.

[For production]

For example, in the case of a relatively easy turn, such as raising the ground work equipment and then driving a short distance before making the turn,
The first control means may automatically perform the deceleration operation in conjunction with the lifting operation of the ground work device.

For example, if you want to make a turn after getting close enough to the edge of the work area, such as a ridge, you can operate the operating tools (button switches, levers, etc.) a little before making the turn, and then make the turn. . In this case, since the second control means performs a deceleration operation in advance before turning, the vehicle is in a safe low speed state at the time when the ground working device is raised and the turning is started.

Further, although the second control means requires more operation of the operating tool than the first control means, it is more difficult to operate the operating tool than the first control means, compared to operating a normal gear change lever provided in a driving transmission to a low speed side. ,
Since it is easier to operate the operating tool (bush switch, lever, etc.) for the second control means, there is no particular reduction in operability.

〔Effect of the invention〕

As described above, in addition to the conventional configuration (which automatically decelerates in conjunction with the lifting operation of the ground work device), by providing an easy-to-operate second control means, it is possible to control any turning condition. However, I was able to decelerate without delay and was able to make stable turns.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, an embodiment in which the present invention is applied to a riding-type rice transplanter, which is an example of a working vehicle, will be described in detail based on the drawings.

As shown in Figure 3, the engine (3) is located at the front of the aircraft, supported by the front wheels (1) and rear wheels (2), and the control unit (4) is located at the center.
, a seedling planting device (5) via a link mechanism (11) at the rear.
(equivalent to ground-based work equipment) are connected to each other so that they can be raised and lowered to form a riding rice transplanter.

Then, as shown in Figures 1 and 3, the engine (3)
The power is transmitted to the front wheels (1) and rear wheels (2) via a belt-type continuously variable transmission (6) (corresponding to a transmission for driving) and a gear transmission (7), and the PTO shaft(
10 to the seedling planting device (5).

As shown in FIG.
The gear can be changed to one reverse gear, and the first gear lever (20)
Perform gear shifting operation. The belt type continuously variable transmission (6) is of a split pulley type, and the speed is changed by a tension pulley (19) which is oscillated by an electric cylinder (18).

As shown in FIG. 1, a control panel (22) equipped with a control handle (21) is equipped with a second shift lever (23), and a first potentiometer (8) for detecting the operating position of the control panel (22) is equipped with a control panel (22) equipped with a control handle (21). A signal is input to the control device (17). On the other hand, the second potentiometer (9) that detects the expansion/contraction position of the electric cylinder (18) is connected to the electric cylinder (18).
18) and this second potentiometer (9
) is input to the control device (17).

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

Next, driving-related control will be explained. As shown in FIGS. 1 and 2, a main clutch (29) is provided on the gear transmission (7) side of 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) that detects the rotation speed of the engine (3) is attached to the engine (3) side of the belt type continuously variable transmission (6), and its signal is sent to the control device (17). It has been entered.

When starting work or when there is a temporary stop during planting work, the clutch pedal (30) is depressed and the main clutch (2
9), this turns the clutch switch (32) off.
) is detected. As a result, the belt type continuously variable transmission (6) is automatically operated to the lowest speed position. Then, when the clutch pedal (30) is returned to the engaged position, the belt type continuously variable transmission (6) shifts from that point (the time when the main clutch (29) is fully engaged) to the second shift position. The speed is slowly increased to a speed corresponding to the operating position of the lever (23). As a result, the aircraft takes off smoothly (step (S,), (S2)
).

As described above, the gear transmission (7) has two forward speeds and one reverse speed, with the first forward speed being for planting, and the second forward speed being for driving on the road. And this gear transmission (7)
When the first gear shift lever (20) is operated to the first forward speed position (Fl), a signal from a forward first speed position switch (not shown) that detects this operation is input to the control device (17). Then, there is an operation switch (27) for the seedling planting device (5).
) is operated to the planting position, the process moves to step (S3) (steps (S4), (SS)).

As shown in Figure 1, the control panel (22) is equipped with an accelerator lever (33) for operating the accelerator of the engine (3), and the accelerator lever (33) must be in the fully open position. An accelerator switch (34) is provided for detecting. When the accelerator lever (33) is in the fully open position during planting driving as described above, the belt is adjusted so that the engine speed detected by the rotation speed sensor (31) is maintained within the set range. Continuously variable transmission (6
) is automatically shifted by the electric cylinder (18) (step (SS)).

If the accelerator lever (33) is not in the fully open position, the process moves from step (S3) to step (S7). This ensures that the output voltage from the first potentiometer (8) and the feedback voltage from the second potentiometer (9) match, that is, the second shift lever (23)
The speed is controlled by the belt type continuously variable transmission (6) or the electric cylinder (18) so that the speed corresponds to the operating position.

Furthermore, if the operation switch (27) is operated to a position other than the planting position during planting travel (at this time, the planting operation of the seedling planting device (5) is stopped), one planting process is When it is determined that the aircraft has reached the edge of the ridge, the belt type continuously variable transmission (6) is automatically operated to the lowest speed position (step (S4)).

(S5), (S8)) (corresponding to the first control means). Thereby, the seedling planting device (5) can be rotated at a safe low speed while raising the seedling planting device (5) at the edge of the ridge. Then, when the turning is completed and the operation switch (27) is operated to the planting position to start the next planting process, step (S, ) and step (S
3), the process moves to step (S6) or step (S7), and the belt type continuously variable transmission (6) is operated to the speed increasing side to return to the predetermined planting traveling speed.

In this case, the electric cylinder (18) that operates the belt type continuously variable transmission (6) in steps (Ss) and (Sy)
Since the operating speed is relatively low, when the operation switch (27) is operated to the planting position at the end of a turn, the aircraft will slowly increase speed to the predetermined planting traveling speed.

The states of steps (Ss) and (S8) above are when the operation switch (27) is operated to a position other than the planting position and the turning is performed after a little time has elapsed. however,
If the raising operation of the seedling planting device (5) and the turning operation using the control handle (21) are performed almost simultaneously after approaching the ridge sufficiently, the deceleration operation using the electric cylinder (18) will not be done in time for the start of turning. There are cases.

In such a case, just before reaching the edge of the ridge, press the button-on-button-off type deceleration switch (12) (corresponding to the operating tool) provided on the control panel (22) to turn it on.
Manipulate. As a result, the process moves from step (S,) to step (S8), and the belt type continuously variable transmission (6) is decelerated to the lowest speed position (during this time, the seedling planting device (5) is in the planting operation. ) (corresponding to the second control means). When the aircraft reaches the edge of the ridge, the operation switch (27) is operated to the up position to raise the seedling planting device (5) (at this time, the planting operation of the seedling planting device (5) stops). ), the turning operation is performed using the control knob (21).

When the turn at the edge of the ridge is completed, the deceleration switch (
Press 12) again to turn it off and turn the operation switch (27)
When the is operated to the planting position, the step moves from step (S3) to step (S6) or step (S7), and the belt type continuously variable transmission (6) is operated to the speed increasing side, and the predetermined planting is performed. It returns to running speed.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the working vehicle according to the present invention, FIG. 1 is a diagram showing the state of cooperation between each part of the control panel and each device for traveling, FIG. 2 is a flowchart showing the flow of control, and FIG. 3 is an overall side view of the riding rice transplanter. (5)... Working device, (6)... Transmission device for traveling, (12)... Operating tool.

Claims (1)

[Claims] This is a work vehicle in which a ground work device (5) is connected to the machine body so as to be able to rise and fall freely, and when the ground work device (5) is operated to rise, the transmission for traveling (6) is automatically changed accordingly. A first control means for performing deceleration operation, and a second control means for deceleration operation of the transmission (6) to a preset low speed state based on a command from an artificially operated operating tool (12). A prepared work vehicle.