JP2003134903A - Advance and retreat-switching operation unit in working vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problems wherein in a tractor, or the like, equipped with a so-called back up-controlling device for elevating a working part synchro nized with a retreating operation, since the control is performed by the on and off of a switch at hand, it is troublesome to operate it when states requiring such control and not requiring the control are generated at random. SOLUTION: This operation unit is provided by installing two retreat operation positions for a guide 3 of an advance and retreat-switching lever, setting one of the retreat-operating positions as a non operation position R1 not actuating the back up-controlling device and another retreat-operating position as an operation position R2 for actuating the back up-controlling device. Also, the both operating positions are made as those capable of being switched with a guiding member 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction of a work vehicle provided with a working unit lift control device (backup control device) for raising a working unit to a non-working position in association with a reverse operation.

[0002]

2. Description of the Related Art Conventionally, as shown in Japanese Patent Laid-Open No. 3-195403, an agricultural tractor and a rice transplanter have a working unit which is interlocked with a backward operation so that the working unit does not collide with ridges or the like when moving backward. It is known to have a working unit elevating control device (backup control device) for elevating the work part to a non-working position.

These backup control devices are normally configured to be turned on / off by a switch at hand.

[0004]

However, in the case of the tractor, the operation of the backup control device is suitable for the backward movement for the purpose of alignment, but in the earth closing work at the end of the field, the backup controller is warped. If the controller is inconvenient and it happens many times,
It was necessary to turn on and off the switch at hand each time, and the operation was troublesome.

[0005]

In view of the above problems, the present invention has a steering control device for a work vehicle configured as follows. That is, according to the first aspect of the present invention, in the work vehicle including the working unit raising / lowering control device that raises the working unit (1) to the non-working position when the forward / backward movement switching lever (2) is operated to the backward operating position, At least two reverse operation positions of the switching lever (2) are provided, and one of the reverse operation positions is provided.
One of them is set to a non-operating position (R1) where the working unit elevation control device is not activated, while another reverse operation position is set to an operating position (R2) where the working unit elevation control device is activated. It is a forward / reverse switching operation device for the work vehicle. (Operation) When the forward / reverse switching operation section (2) is operated to one reverse operation position (R1), the height of the working section (1) remains unchanged, and the other reverse operation position (R2) is maintained. ), It is raised to the non-working position.

According to the second aspect of the invention, there are two reverse operation positions (R1, R1) of the forward / reverse switching operation section (2) of the vehicle.
2) is configured to be selectable by a lever guide (3) having a branch portion, and the branch portion restricts the operation to one of the reverse operation positions (R1, R2) to the operation position (4). ) Is provided, the forward / backward switching operation device for a work vehicle according to claim 1. (Operation) By the regulating means (4), the operation position of 1 (R
When the operation to 2) is restricted, the height of the working unit (1) remains the same even when the vehicle is switched to the reverse, and when the operation to another operation position (R1) is restricted, the vehicle is moved backward. With the operation, the working unit (1) is always raised to the non-working position.

Further, in the invention of claim 3, the transmission of the vehicle is constituted by a continuously variable transmission, and the forward and backward movement and the vehicle speed can be changed according to the operation position of the forward and backward movement switching lever (2). A forward / reverse switching operation device for a work vehicle according to claim 1 or 2, wherein the device is configured. (Operation) When the forward / reverse switching lever (2) is operated, the traveling direction of the vehicle is switched and the vehicle speed is also changed according to the operated position.

[0008]

According to the first aspect of the present invention configured as described above, only the operation position of the forward / reverse switching operation unit (2) is selected when the vehicle is moving backward, and the working unit lifting control device is operated and not operated. Since, and can be selected, the operation is simplified and the work can be continuously performed as compared with the configuration in which the same mechanism is turned on and off by the hand switch.

According to the second aspect of the present invention, when it is determined whether or not the operation of the working unit up / down control device is necessary, it is restricted by the restricting means (4) to one operation position. However, it is possible to prevent the operation or non-operation of the operation due to an erroneous operation.

Further, according to the invention of claim 3, the vehicle speed can be changed together with the traveling direction of the vehicle only by operating the forward / reverse switching lever (2). And lever operation can be reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a case where a working unit lifting control device (hereinafter, backup control device) of the present invention is mounted on a tractor T will be described. As shown in FIG. 3, the tractor T has an engine 12 inside a hood 11 at the front of the vehicle body.
The front axle case supporting the front wheels 13 is supported below the bonnet 11, and the cast mission case 14 is connected to the rear portion of the engine 12.
A rear axle case 16 that supports the rear wheel 15 is connected to the rear portion of the case. Then, the rotational power of the engine 12 is appropriately changed by the forward / reverse switching device and the main and auxiliary transmission devices in the transmission case 14 and transmitted to the rear wheel 15 or the front and rear wheels 13, 15.

Further, the forward / reverse switching device switches the forward / backward position by a mechanical interlocking mechanism by operating a forward / backward switching lever 2 which serves as a forward / backward switching operation portion, which will be described later, to switch forward / backward positions. Under the control of the controller 6 which will be described later, the gear shift position is changed through the drive of each gear shift actuator and the electrical and hydraulic interlocking mechanism.

A cabin 19 surrounding the steering handle 17 and the cockpit 18 is provided behind the bonnet 11 and above the mission case 14. The structure of the inside of the cabin 19 will be described. As shown in FIGS. 1 and 2, a meter panel 20 continuously formed with the rear part of the bonnet 11 and the steering handle 17 are provided at the front of the cabin 19. The handle post 21 is provided.

An accelerator lever 22 and a work machine lifting one-touch lever 23 are provided on one side of the handle post 21, and a forward / reverse switching lever 2 is provided on the other side. . And the handle post 21
As shown in FIG. 4, the protruding portion of the forward / reverse switching lever 2 is provided with a lever guide having a front forward operation position F and a rear bifurcated rearward operation position R1, R2, A reverse operation detecting switch 8 is provided as a reverse operation detecting unit at one end of the reverse operation position R2, which is located on one side of the operation position, that is, on the lower side in the illustrated example.

Further, a guide member 4 is rotatably provided on the guide surface of the branch portion to the two reverse operation positions R1 and R2 as a restricting means for restricting an operation to one of the reverse operation positions. It is configured such that it is held at positions P1 and P2 that regulate the operation of only one of the upper and lower reverse operation positions and a position P3 that does not regulate both of them.

1 and 2, reference numeral 24 indicates a windshield of the cabin 19, and reference numeral 25 indicates an air conditioner installed inside the bonnet 11 and the meter panel 20. Further, on the side of the cockpit 18, a raising position setting dial 3 for regulating the raising position of the working depth setting device 30 and the working unit 1 is provided.
1, various setting devices are provided, and various operation levers such as the main speed change lever 32, the auxiliary speed change lever 33, and the working machine lifting lever 34 are provided. Also, each lever 3
2, 33, 34 are provided with potentiometers 32s, 33s, 34s for detecting the operating positions of the levers on the rotation bases thereof, and a detection signal is transmitted to the controller 6 serving as a control unit together with the various setting devices 30, 31. Has become.

The main gear shift lever 32 and the sub gear shift lever 33 are arranged side by side as shown in FIG. 5, and are standard when the gear shift positions of both levers 32 and 33 are combined between the respective lever guides. It is configured to display the vehicle speed.
In the above-mentioned example, since the main transmission lever 32 is set to the "2" speed and the auxiliary transmission lever 33 is set to the "low" speed, the standard vehicle speed in this case is 3 km / h. Compared with the structure that provides a vehicle speed table inside the fender,
The vehicle speed can be understood at a glance at the time of shifting, and the operability of the tractor T can be improved.

A hydraulic cylinder for raising and lowering a working unit, which serves as an actuator, is provided on the rear upper surface of the transmission case 14, and a lift arm 35 connected to a piston of the cylinder is vertically rotated to cause a link mechanism 36 to intervene. It is configured to raise and lower the working unit.

Incidentally, here, the rotary working machine 1 is connected as a working unit. Further, reference numeral 37 in FIG.
Is a lift arm angle sensor provided on the rotation base of the lift arm 35, and is configured to indirectly detect the height of the working machine 1. Thereby, the working machine lifting lever 3
In order to make the detection angle of the potentiometer of No. 4 and the detection angle of the lift arm angle sensor 37 correspond, the first position control for driving the working machine lifting hydraulic cylinder is performed.

The work machine lifting one-touch lever 23
The upward or downward turning operation is detected by the raising operation detecting switch 38 or the lowering operation detecting switch 39 provided on the lever base, and the setting position of the working machine lifting lever 34 and the raising position setting dial 31 are detected. It is configured to perform a second position control that raises or lowers at a stroke from the set position.

Further, when the working machine lifting lever 34 is at a predetermined working position, the value detected by the tilling depth sensor 40 provided on the rotary working machine 1 and the tilling depth set by the tilling depth setting device 30. Plowing depth control is performed to vertically adjust the lift arm angle so that the set value matches.

Next, with reference to FIG. 8, the controller 6 serving as the control unit of the tractor T will be described. The controller 6 is internally provided with a CPU for processing various signals, a RAM for temporarily storing the various signals, an EEPROM for storing various control programs such as backup control of the present invention, and the like. Potentiometer 3
4s, raising operation detecting switch 38, lowering operation detecting switch 39, raising position setting dial 31, lift arm angle sensor 35, tilling depth setting device 30, tilling depth sensor 40, potentiometer 32s for main shift lever 32, potentiometer for sub shift lever. 33 s, and the reverse operation detection switch 8 for the forward / reverse switching lever 2 and the like are connected and provided.

At the output section, a solenoid 45 of a proportional pressure control valve for raising the working machine, which supplies and discharges pressure oil to and from the hydraulic cylinder for raising and lowering the working machine, a solenoid 46 of a proportional pressure control valve for lowering the working machine, and The main shift operation actuator 47 for changing each shift position of the main transmission and the sub transmission.
, And the auxiliary shift operation actuator 48 are connected to each other.

The tractor T constructed as above is shown in FIG.
As shown in FIG. 5, when the electric system is turned on, the controller 6 reads the setting values and detection values of various setting devices and switches, and the backup control, position control, and shift control according to the present invention are sequentially performed.

In the backup control, as shown in FIG. 8, it is determined in STEP 1 whether or not the reverse operation detection switch is ON, and if the result is YES, the forward / reverse switching lever 2 moves to the lower reverse operation position R2. The solenoid 45 of the proportional pressure control valve is energized and the lift arm 35, that is, the working machine 1 is raised to the raised position set by the raised position setting dial 31.

On the other hand, if the determination in STEP1 is NO, it is determined that the forward / reverse switching lever 2 is in the forward operation position F or the reverse operation position R1 in which the backup control is not operated, and the CPU jumps STEP2 and proceeds to STEP3. Further, in STEP3 and STEP4, the angle of the lift arm 35 is detected, and when the angle is equal to or larger than a predetermined angle, the main / sub shift operation actuators 47 and 48 are driven to increase the shift position from the current position by one speed.

As a result, since the gear shift position is automatically increased to the first speed as the working machine 1 is raised, when the operator is not working, the operator is not required to perform a gear shift operation and can travel quickly. Then, a predetermined process is further performed to end the backup control process.

In the forward / reverse switching lever 2 and the backup control of the tractor T configured as described above, it is determined whether the working machine 1 is raised or held at the lever operation position.
That is, since it can be selected during the reverse operation, it is possible to quickly and easily cope with a case where the work machine 1 needs to be raised and a case where the work machine 1 is not required to rise randomly in the same work.

Further, here, the reverse operation position R1 in which the backup control is not activated is set to the forward operation position F and the straight operation position, and the reverse operation position R2 in which the backup control is activated is lowered by one step to change the operation direction once. Therefore, it is possible to recognize the operation of the control device, and it is possible to prevent an unexpected operation such as suddenly raising the working machine 1 to come into contact with an obstacle.

Furthermore, when it is desired to operate only one of the reverse operation positions, one of the operations can be restricted by appropriately positioning the guide member 4, so that the operation or non-operation of the operation due to an erroneous operation can be prevented. Can be prevented. Further, as another mode of the present invention, instead of the stepped main / sub shift, either one or the entire transmission is constituted by a continuously variable transmission such as HST. Further, a potentiometer for detecting the lever position is provided at the base of the forward / reverse switching lever 2, and an actuator such as an electric cylinder for changing the gear shift position is provided in the continuously variable transmission, and the actuator according to the lever position. Is driven to obtain a predetermined vehicle speed.

As a result, when the forward / reverse switching lever is operated, the vehicle speed as well as the forward / backward traveling direction of the vehicle can be changed, so that the transmission is composed of a stepped transmission and each lever is operated in comparison. Thus, the gear shifting operation can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a handle post.

FIG. 2 is a plan view of a handle post portion.

FIG. 3 is an overall side view of the tractor.

FIG. 4 is an enlarged view of a guide portion of a forward / reverse switching lever.

FIG. 5 is an enlarged view of a guide portion of a main / sub shift lever.

FIG. 6 is a diagram showing a connection state of a controller.

FIG. 7 is a control flowchart (1).

FIG. 8 is a control flowchart (2).

[Explanation of symbols]

1 rotary working machine 2 Forward / reverse switching lever 3 Lever guide 4 Guide member 6 controller 8 Reverse operation detection switch T tractor

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B60K 20/02 B60K 20/02 E B62D 49/00 B62D 49/00 S (72) Inventor Kiyofumi Sakurabara Ehime No. 1 Yakura, Tobe Town, Iyo-gun, Iseki Agricultural Machinery Co., Ltd. F-Term (Reference) 2B043 AA03 AB15 BA02 BB03 DA05 DA15 2B304 KA08 LA02 LA06 LB05 LB15 MA01 MA02 MC13 PA01 PA05 PA11 QA03 QC04 QC14 RA01 RA28 3D040 AA57 AC62 AD AF00

Claims (3)

[Claims] 1. A forward / backward movement switching lever (2) in a work vehicle equipped with a working portion raising / lowering control device for raising the working portion (1) to a non-working position when the forward / backward movement switching lever (2) is operated to a backward movement operation position. ) At least two reverse operation positions are provided, and one of the reverse operation positions is set to a non-operation position (R1) that does not operate the working part elevation control device, while the other reverse operation positions are set to the above-mentioned reverse operation positions. A forward / reverse switching operation device for a work vehicle, which is set to an operating position (R2) for operating the work unit up / down control device. 2. The two reverse operation positions (R1, R2) of the forward / reverse switching lever (2) of the vehicle are configured to be selectable by a lever guide (3) having a branch portion, and the branch portion is provided with The forward / reverse switching operation device for a work vehicle according to claim 1, further comprising a restricting unit (4) for restricting an operation to one of the reverse operation positions (R1, R2). 3. The transmission of the vehicle is a continuously variable transmission, and the forward and backward movement and the vehicle speed can be changed according to the operation position of the forward and backward movement switching lever (2). The forward / backward switching operation device for a work vehicle according to claim 1 or 2.