JPH0672345A - Steering control mechanism of paddy field working vehicle - Google Patents

Abstract

PURPOSE:To facilitate the fine adjustment operation to correct the direction of a vehicle body in a paddy field. CONSTITUTION:A steering control mechanism 14 is provided where wheels 9 for steering a vehicle body is steered by a hydraulic cylinder 12 based on the turning operation of a steering wheel 11, a pair of right and left operation switches SW1, SW2 are arranged in the vicinity of a clutch-operation part of the steering wheel 11, and the hydraulic cylinder 12 is operated by the prescribed fine amount so as to operate the vehicle to either of the right or the left direction based on the selected operation of either of the operation switches SW1 or SW2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steering control mechanism for a paddy field working machine, which is configured to steer a vehicle body steering wheel by an actuator based on a turning operation of a steering handle.

[0002]

2. Description of the Related Art In the steering control mechanism for a paddy work machine, a steering handle and a steering wheel have heretofore been used as a mechanical mechanism such as a gear mechanism, a pitman arm and a link, or a hydraulic power steering system. It is common that the wheels are operated in proportion to each other according to the amount of rotation of the steering wheel by interlocking with each other via a mechanism.

[0003]

In the above-mentioned conventional structure, since the wheels are steered and swung in accordance with the turning operation angle by the turning operation of the steering wheel, the running ground is hard such as running on the road. In this case, the maneuverability is good, but in this type of paddy work machine, for example, a riding-type rice transplanter, since the field scene where work is performed is a mud layer, it becomes difficult to operate the steering wheel. . In particular, when the aircraft is running straight for ground work, due to the resistance of the mud layer to the wheels and the unevenness of the tiller,
Even though the steering wheel is maintained in a straight running state, the aircraft may try to move in an oblique direction, and it is the reality that the operator always repeats the fine movement operation of the steering wheel to maintain the straight running state. Work is being done. However, such a maneuvering operation is relatively easy for a person with a long working experience,
It may be difficult for an inexperienced person or an aged person, and recently, work speed has been increased, and improvement of maneuverability in this respect has been desired. The present invention aims to eliminate the above-mentioned problems.

[0004]

According to a characteristic configuration of the present invention, in the steering control mechanism for a paddy work machine described at the beginning, a pair of left and right operation switches are provided near the grip operation portion of the steering handle. A steering control mechanism for steering and driving the actuator by a predetermined minute amount so as to turn and steer in either of the left and right directions based on one of the operation switches is operated.

[0005]

When the vehicle body travels straight in the field, if the vehicle body travels diagonally according to the situation in the field even if the steering wheel is kept straight, the vehicle body on either side By operating the operation switch that acts on the correction direction side, it is possible to drive the wheel steering actuator by a small amount and perform the direction correction of the vehicle body without operating the steering wheel.

[0006]

As a result, even a worker who has little work experience can easily carry out a certain amount of steering operation simply by operating the switch, as compared with the case where the direction of the vehicle body is corrected by rotating the steering wheel. Therefore, for example, the steering operability of the fine adjustment operation for correcting the orientation of the vehicle body in the field such as straight running is improved.

[0007]

Embodiments will be described below with reference to the drawings. Figure 3
Shows a riding-type rice transplanter as an example of a paddy field working machine. This rice transplanter connects a seedling planting device 3 to the rear part of the riding type traveling body 1 via a link mechanism 2 so as to be able to move up and down and roll freely around the front-rear axis, and the seedling planting device 3 connects the mat seedlings for planting. Equipped with a seedling stand 4 that is placed and moves back and forth with a constant stroke, a planting mechanism 5 that takes out planting seedlings one by one from the lower end of the seedling stand 4, and plants in the field. The traveling machine body 1 is configured to allow planting work of seedlings while traveling in the field.

The traveling machine body 1 is equipped with an engine 7 in a hood at the front of the machine body, and is configured as a four-wheel drive type so that the power of the engine 7 is transmitted to front and rear wheels 9 and 10 via a mission case 8. The pair of front wheels 9, 9 are configured as steering wheels that can be swung left and right based on the turning operation of the steering handle 11 of the driving section.
Is a non-steering wheel. The steering operation of the front wheels 9 and 9 is based on the operation of the steering handle 11 and a hydraulic cylinder 12 for steering (an example of an actuator).
The power steering structure is configured so that That is, as shown in FIG. 1, pressure oil is supplied from the hydraulic pump P driven by the engine 7 to the lower end portion of the operation shaft 11 a of the steering wheel 11, and the operation is performed according to the operation direction and the amount of rotation of the steering wheel 11. The amount of oil is set to the pressure oil supply path L of each of the double-acting steering cylinders 12.
1, a hydraulic control mechanism PS for full hydraulic power steering to be supplied to L2 is provided, and a piston rod 12b of a steering cylinder 12 having a cylinder body 12a fixed to the machine body is provided with knuckle arms 13 of left and right front wheels 9, 9.
The piston rod 12b is laterally moved by the hydraulic oil supplied from the hydraulic control mechanism PS so as to steer and swing the left and right front wheels 9 and 9.

A pair of left and right push operation type operation switches SW are provided near the grip operation portion of the steering handle 11.
1, SW2 are provided, and the left and right operation switches SW1, S
The steering cylinder 12 is turned so as to steer in either the left or right direction based on any one of the W2 operation.
A steering control mechanism 14 for steering and driving the vehicle is provided. More specifically, as shown in FIG.
The operation switch SW is a push-type operation switch on both right and left sides, which is operated by grasping the steering handle 11 in a straight running state.
1 and SW2 are respectively arranged so that the steering wheel 11 can be pressed with a finger while being held, and the outputs of the operation switches SW1 and SW2 are given to the control circuit 15. The control circuit 15 operates the operation switches SW1 and SW2. On the basis of the above operation, the hydraulic oil is selectively operated by a predetermined amount so as to be steered to the side (right or left direction) where the pressure is supplied to the pressure oil supply paths L1 and L2 of the steering cylinder 12. The electromagnetic control valve CV is drive-controlled to supply the electric current. The control circuit 15 and the electromagnetic control valve CV constitute the steering control mechanism 14. Therefore, when the vehicle body is going to travel obliquely due to the situation in the field during straight traveling in the field, when the direction of the vehicle body is corrected by steering a small amount, the operation switch SW1 located in the direction to be corrected is operated. , SW2 is pressed once, for example, about 0.
The front wheels 9 and 9 are steered and swung in that direction by 5 degrees to enable fine adjustment steering operation. At this time, since the steering handle 11 is fixed in a straight traveling state, the rotational phase relationship between the steering handle 11 and the front wheels 9, 9 is different, but this phase difference is reflected in the control panel 16. The indicator 17 is provided so that the operator can always confirm it. It can be implemented by providing means for previously adjusting the operation amounts of the front wheels 9 and 9 by pressing the operation switches SW1 and SW2 once. INDUSTRIAL APPLICABILITY The present invention is applicable not only to rice transplanters but also to various paddy working machines such as fertilizer applicators and seeders.

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

[Brief description of drawings]

FIG. 1 is a control block diagram.

FIG. 2 is a plan view of a switch mounting portion.

[Figure 3] Overall side view of rice transplanter

[Explanation of symbols]

 9 Front Wheel 11 Steering Handle 12 Actuator 14 Steering Control Mechanism SW1, SW2 Operation Switch

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location B62D 137: 00

Claims (1)

[Claims] 1. A steering control mechanism for a paddy work machine, which is configured to steer a vehicle body steering wheel (9) by an actuator (12) based on a turning operation of a steering handle (11). , A pair of left and right operation switches (SW1) and (SW2) are provided near the grip operation portion of the steering handle (11), and based on any one of the left and right operation switches (SW1) and (SW2) A steering control mechanism for a paddy working machine, comprising a steering control mechanism (14) for steering and driving the actuator (12) by a predetermined minute amount so that the actuator (12) can be steered in either the left or right direction.