JP2659303B2 - Paddy working machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paddy field working machine, and more particularly, to an improvement of a body running drive system in a paddy field working machine.

[0002]

2. Description of the Related Art Conventionally, in a paddy field working machine, for example, a riding type rice transplanter, conventionally, a four-wheel drive state is always maintained, a rear wheel is made larger in diameter than a front wheel, and a propulsion lug is made larger. Therefore, it was general to mainly obtain the propulsion by the rear wheels.

[0003]

However, the paddy field working machine as described above travels in a wetland, and furthermore, a seedling planting device or a seedling for planting is placed on the rear part of the machine to reduce the weight of the paddy field. Therefore, if the rear wheel has penetrated mud, for example, the rear wheel may further enter the mud and may not be able to run. In addition, when turning, the front wheel of the aircraft may rise due to an increase in the driving reaction force of the rear wheels, and the front of the aircraft may also float when crossing a ridge. An object of the present invention is to eliminate the above disadvantages.

[0004]

According to the first aspect of the present invention, a four-wheel drive state in which the front wheel and the rear wheel are driven, and a two-wheel drive state in which only the front wheel is driven can be switched freely. A load detection sensor for detecting the ground contact load of the front wheels is provided, and a drive state switching means for switching from the four-wheel drive state to the two-wheel drive state when the load detected by the detection sensor becomes a predetermined value or less is provided. The characteristic configuration of the second invention is that it is configured to be freely switchable between a four-wheel drive state in which the front wheels and the rear wheels are driven respectively and a two-wheel drive state in which only the front wheels are driven, and an angle for detecting the longitudinal inclination angle of the body. A detection sensor is provided, and when this detection angle exceeds a predetermined value,
It is characterized in that a drive state switching means for switching from the four-wheel drive state to the two-wheel drive state is provided.

[0005]

[Action] For example, when the rear wheel is going into mud and the front of the aircraft is trying to lift up, when the front of the aircraft is trying to lift up when turning or traveling over a ridge, When the load on the front wheels is reduced or the front part of the body is lifted and detected by the load detecting sensor or the angle detecting sensor, the state is switched to the two-wheel drive state in which only the front wheels are driven.

[0006]

As a result, during normal running on a flat ground, 4
If the front part of the fuselage is slightly lifted up as described above, the rear wheels stop rotating and the aircraft propulsion works only on the front wheels, while the wheel drive can provide a certain propulsion force. Front lifting caused by the rotational driving reaction force of the rear wheels can be suppressed, and reliable traveling by the front wheels can be performed.

[0007]

Embodiments will be described below with reference to the drawings. FIG.
2 shows a riding type rice transplanter as an example of a paddy field working machine. This rice transplanter is configured such that a seedling planting device 2 is connected to a rear part of a riding type traveling machine body via a link mechanism 1 so as to be able to move up and down. The traveling body has an engine 4 mounted in a hood 3 at the front of the body, and has a transmission system configured to transmit the power of the engine 4 to the front and rear wheels 6, 7 and the seedling planting device 2 via a transmission case 5, It is configured so that seedlings can be planted on the mud surface while running the aircraft.

The power of the engine 4 is input to the transmission case 5 via a belt transmission mechanism 8 and supplied to the front wheels 6 via a gear shift type transmission in the transmission case 5, while being transmitted via a front-rear transmission shaft 10. And is supplied to the rear wheels 7 so as to be supplied to the four-wheel drive type. As shown in FIGS. 4 to 6, the shift gear 11 in the gear shift type transmission has a chamfer 12 formed at the bite side end of the gear 11 for smooth biting. The tip end surface 12a of the chamfer 12 is formed to have a predetermined thickness in order to secure strength. Then, even when the end faces 12a having this thickness are brought into abutting state at the time of the engagement of the gears 11, any one of the gears 11 is displaced in the circumferential direction, and as shown in FIG. The spline engaging portion is provided with a margin 13 in the circumferential direction that is equal to or larger than the width of the end face 12a.

Further, a clutch 1 capable of intermittently transmitting power is provided at an intermediate portion of the transmission shaft 10 from the transmission case 5 to the rear wheel 7.
When the clutch 14 is set to the engaged state, the front wheel 6 and the rear wheel 7 are each driven to be in a four-wheel drive state. When the clutch 14 is set to the disengaged state, only the two wheels by the front wheel 6 are provided. Is configured to be driven.
Then, a load detection sensor S for detecting the ground load of the front wheel 6
And a driving state switching means A for automatically switching the clutch 14 from the engaged state to the disengaged state when the load detected by the load detecting sensor S1 becomes equal to or less than a predetermined value. That is, as shown in FIGS. 1 and 2, a load detection sensor S1 is provided on the axle bearing 15 of the front wheel 6 to detect a change in the ground pressure of the front wheel 6, and the detection result of the load detection sensor S1 is When it is detected that the front wheel 6 has risen slightly below the preset value, the control device 17
Controls the drive of the electric cylinder 18 to disengage the clutch 14. The control device 17 and the electric cylinder 18 constitute the driving state switching means A. In this way, when the front part of the aircraft becomes slightly floating, the rear wheels 7
Is stopped and the body is propelled by driving only the front wheels 6, so that floating can be suppressed and safe traveling can be performed.

[Other Embodiment] Instead of the structure for detecting the contact pressure of the front wheels 6, as shown in FIG. 7, an angle detection sensor S2 for detecting the front-rear inclination angle of the traveling body is provided, and the detection result is a predetermined value. As described above, the clutch 14 may be configured to be disengaged when the vehicle is in the forward-upward posture.

[0011] In the claims, reference numerals are provided to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 Transmission system diagram

FIG. 2 is a sectional view of a wheel bearing.

FIG. 3 is an overall side view of the rice transplanter.

FIG. 4 is a sectional view of a gear occlusion portion.

FIG. 5 is a side view of a gear engagement portion.

FIG. 6 is a perspective view of a gear engaging portion.

FIG. 7 is a side view of a rice transplanter according to another embodiment.

[Explanation of symbols]

 6 Front wheel 7 Rear wheel A Drive state switching means S1 Load detection sensor S2 Angle detection sensor

Claims (2)

(57) [Claims] 1. A front wheel (6) that can be freely switched between a four-wheel drive state in which a front wheel (6) and a rear wheel (7) are driven and a two-wheel drive state in which only a front wheel (6) is driven. A load detection sensor (S1) for detecting a ground load of the vehicle, and a drive state switching means (A) for switching from the four-wheel drive state to the two-wheel drive state when the load detected by the detection sensor (S1) falls below a predetermined value. ) Paddy field working machine. 2. The vehicle is configured to be switchable between a four-wheel drive state in which a front wheel (6) and a rear wheel (7) are driven respectively and a two-wheel drive state in which only a front wheel (6) is driven, and the longitudinal inclination of the body. An angle detection sensor (S2) for detecting an angle is provided.
A paddy working machine comprising a drive state switching means (A) for switching to a wheel drive state.