JPH0636662Y2 - Travel control device for work vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a traveling control device for a work vehicle, and more particularly to a traveling control device for a work vehicle such as a combine, which is used during manual handling work. Is.

<Prior Art> “Background of the Invention” Conventionally, a work vehicle, for example, a combine harvester cuts a grain culm planted in a field by operating a cutting blade and traveling while appropriately raising and lowering a pretreatment unit. ing. Further, even after the mowing work is completed, the pillow culms that have been mowed remain unthreshed in the headland part of the corner of the field, and the mowing part also falls over or falls off the cutting blade. Grains may be left behind little by little due to reasons such as the above.

And in order to process these unthreated grain culms and uncut grain culms,
The operator's operation is temporarily stopped and the operator is in the driver's seat. The uncut grain culms remaining in the field are collected by hand cutting and manually put in the opening of the threshing device with the feed chain to perform threshing work. .

When performing such manual handling work, it is necessary to move the combine while traveling in order to spread the culms uniformly over the entire field, but the manual handling position and the driver's seat should be separated. However, it was difficult to operate at the same time as the manual operation.

"Prior Art" Therefore, by installing the operating means at a position other than the driver's seat and operating the operating means from the outside of the machine, the combine or the like can be moved forward or backward at a preset speed to There has been proposed a travel control device configured so that the aircraft can be moved while staying in the field without returning to the driver's seat each time.

<Problems to be solved by the invention> However, in the above-mentioned conventional device, when the gear shift lever is in the "high speed" position when operating from the outside of the machine, the work vehicle suddenly starts moving at high speed and the operator follows the movement of the machine. However, when moving the machine during threshing work, there is a danger that the worker's hand may get caught in the feed chain due to sudden high speed start.

<Means for Solving the Problems> The present invention for solving the above problems includes a continuously variable transmission 34, a continuously variable transmission lever 13, and an auxiliary transmission in a machine body 1, and the continuously variable transmission. Actuator for operating 34 35
In the work vehicle including the shift position detecting means 41 for detecting the shift position thereof, the traveling operation means 18 and the auxiliary shift interlocking switch which are used when the machine body 1 is manually handled.
17a is installed and only when the auxiliary transmission is in the low speed position,
It is characterized in that the operation by the traveling operation means 18 is activated.

<Operation> The continuously variable transmission 34 is operated by an actuator 35 hydraulically operated by the continuously variable lever 13. The power of the continuously variable transmission 34 is further converted by the auxiliary transmission and transmitted to the traveling means. Sub gear shift interlock switch 17a
Is in the “on” state only when the auxiliary transmission is in the low speed position, and only in this case the traveling operation by the traveling operation means 18 is possible. Then, during the operation by the traveling operation means 18, the gear shift position is detected by the gear shift position locating means 41, and if it is not the lowest speed, the continuously variable transmission 34 is set to the lowest speed position by the actuator 35. After that, the driving starts.

<Embodiment> FIG. 2 is an overall plan view of a combine equipped with the present invention. A pre-processing unit 3 that moves up and down is attached to the front of the machine body 1, and a driver's seat 5 for running the combine is provided to the rear of the right side thereof. Further, the machine body 1 is equipped with a thresher 7 for threshing the culms cut by the pre-processing unit 3 and discharging the culms backward. A feed chain 9 is wound around the threshing machine 7 along the end of the machine body 1 to convey the cut culm to the rear.

At the front and left side of the driver's seat 5, an operation panel 11 for performing work operation of the combine is attached, and the continuously variable transmission lever 1
3. A threshing machine clutch lever 15 and an auxiliary transmission lever 17 interlocking with the auxiliary transmission are provided, and each lever swings in the front-rear direction.
The operation mechanism using these levers includes an interlock switch 13a,
15a and 17a are provided, and each switch is attached to the lever side in this embodiment. In particular, the switch 17a is in the "on" state only when the auxiliary transmission is in the low speed position.

As shown in FIG. 3, the traveling operation means 18 at the time of manual handling work is provided above the starting end portion of the feed chain 9 and is provided with an engine stop switch 19, a forward operation switch 21 and a reverse operation switch 23. . The tip portion of the rail 25, which is biased and supported along the feed chain 9, swings in the vertical direction and swings upward during manual handling, so that the grain stem can be easily placed between the feed chain 9 and the rail 25. It is configured to be bitten. 27 is a stopper for keeping the rail 25 open. In this way, by installing the traveling operation means 18 during the manual handling work near the manual handling work position, even if a trouble occurs during the manual handling work, it is possible to immediately take measures such as stopping the engine.

Next, the hydraulic system for operating the combine will be described. The forward clutch and the reverse clutch that transmit the driving force of the engine to the forward and backward are connected to the hydraulic cylinders 31 and 32, respectively.
It is turned on and off by hydraulic pressure. The hydraulic control of the hydraulic cylinders 31, 32 is controlled by the travel control valve 33. The travel control valve 33 is operated by solenoids 33a and 33b, the hydraulic cylinder 31 of the forward clutch is operated by the operation of the solenoid 33a, and the hydraulic cylinder 32 of the reverse clutch is operated by the operation of the solenoid 33b, and the forward and backward clutches are turned on and off. To be done. An actuator (return cylinder) 35 for operating the continuously variable transmission 34 is hydraulically operated by a shift control valve 37, and the shift control valve 37 is opened / closed by solenoids 37a and 37b.

The travel control device will be described below. As shown in FIG. 1, all of the above switches are connected to the central processing unit 29, and the other end is grounded. Further, each solenoid of each control valve 33, 37 in the hydraulic circuit is the central processing unit 29.
It is operated by turning on and off according to the output signal from. Here, the potentiometer 39 is linked to the continuously variable transmission lever 13, and the central processing unit 29 judges the set position of the continuously variable transmission lever 13 based on the output value from the potentiometer 39. Further, the potentiometer 41, which is a shift position detecting means, is interlocked with the movable pulley of the continuously variable transmission, and the central processing unit 29 knows the position of the movable pulley from the output value from the potentiometer 41 and judges the traveling speed.

Next, based on the flowchart of FIG. 4, the central processing unit
The traveling control operation of 29 will be described.

When the continuously variable lever 13 is in the forward F or reverse R direction, the central processing unit 29 gives priority to the operation of the traveling operation means 18 for manual operation by the signal from the switch 13a, and the solenoid 33 is operated.
Activate a and 33b to engage / disengage the clutch. Further, the solenoids 37a, 37b on the OUT3 or OUT4 side are operated according to the output value from the potentiometer 39 to adjust the speed according to the set value of the continuously variable transmission lever 13. Where solenoid 37a,
When 37b is actuated, the movable pulley moves to the high speed side or the low speed side by hydraulic pressure.

When the continuously variable transmission 13 is in the neutral position,
Whether the threshing clutch is turned on or off is determined by the switch 15a.
When the threshing clutch is not "ON", the solenoids 33a, 33b have priority over the forward / reverse switches 21, 23 for manual operation.
Is in the "off" state and the forward and reverse clutches are not engaged.

When it is determined by the switch 15a that the threshing clutch is "on", it is determined by the switch 17a whether or not the auxiliary shift clutch is in the "low speed position". Prior to 23, the solenoids 33a and 33b are in the "off" state, and the forward / reverse clutch is not engaged.

Further, only when the vehicle is in the "low speed position", the traveling operation can be performed by operating the forward switch 21 and the reverse switch 23.

When the forward switch 21 is turned on, the potentiometer 41
Know the traveling speed of the combine from the output value of the minimum speed V ₁
In this case, the solenoid 33a is operated to set the forward clutch "ON". When the speed is higher than the minimum speed V ₁ , the solenoid 37b is operated to drive the return cylinder 35, the movable pulley of the continuously variable transmission 34 is moved, and the solenoid 33a is operated at the minimum speed V ₁ .

The same operation is performed when the reverse switch 23 is turned on, the solenoid 33b is activated, and the reverse clutch is turned on.
Becomes

As described above, when the traveling operation is performed by the manual operation traveling operation means 18, the auxiliary transmission is always in the low speed position, and the continuously variable transmission 34 is always set in the low speed position. The traveling operation during the handling work can be always performed at low speed.

FIG. 5 shows a direction sensor 43 attached to the frame pipe of the reaping section, and an interlocking rope 47 is connected to the base end of a contact rod 45 that swings in contact with the rice plant. As shown in FIG. 6, the interlocking rope 47 is inserted into the narrow guide 49 through the hole 49a formed on the surface of the narrow guide 49 attached along the left side of the pretreatment unit 3 to feed the feed chain. 9 Guided to the hand-working position near the start end. A handle 51 is attached to the tip of the interlocking rope 47 guided to the hand-holding work position. When the handle 51 is manually pulled, the end of the contact rod 45 on the base end side is pulled and swings. Pre-processing is not performed during manual handling, so direction sensor 43
Is not necessary. Therefore, in the configuration described above, the direction sensor 43 is shared as an operation switch during manual handling work. Provide a changeover switch in the drive control circuit. As shown in the imaginary line in FIG. 5, the contact rod 45 switches at three swing points A, B, and C. Therefore, when the changeover switch is switched for manual operation, each position is changed. Each stop,
Switch the forward and reverse switches. Since the contact rod 45 is constantly urged in the direction of the A position, the handle 51 is normally pulled by the contact rod 45 via the interlocking rope 47 and accommodated and held in the narrow guide 49. Handle 51
When is pulled, the contact rod 45 is rotated by the interlocking rope 47 and the switch is switched between the B and C positions, so that the forward and backward operations can be performed at the manual operation position.

In this way, if the direction sensor 43 is shared as a traveling operation device during a manual operation, it is not necessary to attach an independent operation device, complicated wiring is not required, which contributes to reduction in manufacturing cost and shortens the manufacturing period. be able to.

<Effect of the Invention> According to the device of the present invention configured as described above, the operation by the traveling operation means is possible only when the auxiliary transmission is in the "low speed position". Even if there is a runaway, the auxiliary transmission is always in the low speed position, so the work vehicle runs at low speed, there is less risk of hands getting caught in the feed chain during manual handling work, and the engine stops. It is also possible to easily carry out the switch operation of various kinds.

[Brief description of drawings]

FIG. 1 is a control circuit diagram and hydraulic circuit diagram of the traveling control device, FIG. 2 is an overall plan view of a combine using one embodiment of the present invention, and FIG. 3 is a feed chain showing a mounting portion of traveling operation means. FIG. 4 is a side perspective view of the vicinity of the starting end portion, FIG. 4 is a flow chart showing the operation of the traveling control device of the present invention, and FIG. 5 is a plan view of the essential portions of the second embodiment using a direction sensor as traveling operation means.
FIG. 6 is likewise an overall side view of the combine. Reference numeral 1: Airframe, 13: Continuously variable gear lever 17a: Sub-transmission interlocking switch 18: Travel operation means, 34: Continuously variable transmission device 35: Actuator, 41: Shift position detection means

Claims (1)

[Scope of utility model registration request] 1. An actuator (35) provided with a continuously variable transmission (34), a continuously variable transmission lever (13), and an auxiliary transmission on an airframe (1), and an actuator (35) for operating the continuously variable transmission (34) and the same. In a work vehicle provided with a shift position detecting means (41) for detecting a shift position, a traveling operation means (18) and an auxiliary shift interlocking switch (17a) which are used in the machine body (1) for manual handling work and the like. ) Is installed so that the operation by the traveling operation means (18) is activated only when the auxiliary transmission is at a low speed position.