JPH0430710A - Sulky rice transplanter equipped with four wheel steering system - Google Patents

Abstract

PURPOSE:To improve turning and steering performance and the accuracy of seedling planting, by making the steering angle of rear wheels smaller than that of front wheels and making the range of rotation of the rear wheels smaller than the grading width of grading floats of the rear wheels. CONSTITUTION:A system capable of simultaneously steering wheels 3 and front wheels 4 is equipped and the respective steering angles of the front wheels and the rear wheels are set so that the steering angle of the rear wheels may be smaller than that of the front wheels. The respective tracks marked by traveling front wheels and by traveling rear wheels are rationally combined, and the range of rotation of the rear wheels is set so as to be smaller than that of the grading width of grading floats 26 behind the rear wheels, thus grading the tracks marked by the traveling rear wheels without fail.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a riding rice transplanter equipped with a four-wheel steering mechanism.
In particular, the present invention relates to a riding rice transplanter that has an improved relationship between the steered rear wheels and the float that levels the track of its travel.

[Conventional technology]

Conventionally, a passenger vehicle has a pair of left and right front wheels and a rear wheel, and is equipped with a mechanism for simultaneously steering the front and rear wheels.
A riding type rice transplanter equipped with a transplanting section having a float via an elevating mechanism is well known, for example, from Japanese Patent Application Laid-Open No. 62-205713.

This prior art four-wheel steering mechanism is configured such that the left and right front wheels and rear wheels are respectively steered in the same direction (same phase) or in opposite directions (opposite phase) at predetermined steering angles. .

[Problem to be solved by the invention]

In the above-mentioned prior art riding rice transplanter, the turning performance is greatly improved compared to the conventional one that steers only the front wheels, but the steering angle of each of the left and right front wheels and rear wheels and the distance between the rear wheels and the float are significantly improved. No consideration was given to the relationship between rice transplanters, and as a result, there were problems with its performance as a rice transplanter.

The present invention has been made to solve the above problems.

[V's means of solving problems]

In order to achieve the above object, the present invention has a pair of left and right front wheels and a rear wheel, and a float is installed at the rear of a passenger vehicle body equipped with a mechanism for simultaneously steering the front and rear wheels via a lifting mechanism. In a riding rice transplanter equipped with a transplanting section having
The steering angles of the front wheels and rear wheels are set so that the rear wheels are smaller than the front wheels, and the rotation range of the rear wheels due to steering is
The present invention is characterized in that it is configured to be smaller than the leveling width of a float that is provided behind the rear wheels and levels the track of the rear wheels.

[For production]

With the above configuration, the present invention rationally combines the running trajectories of the front wheels and the rear wheels, thereby improving turning and steering performance.

In addition, the trail left by the rear wheels will be leveled with a float, and the seedlings will be planted on the leveled area.
Seedling planting will be more accurate.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a passenger vehicle body, and this passenger vehicle body 1 is rotatably driven at the front and rear parts of the vehicle body frame 2, respectively, and runs on the left and right sides, each of which is steered. It is equipped with a pair of front wheels 3 and rear wheels 4. The rear wheel 4 supports its support frame 4a via a rolling shaft 5 so as to be rollable relative to the vehicle body frame 2. An engine 6 is mounted approximately at the center of the vehicle body frame 2 in the longitudinal direction, and the engine 6 is covered by a cover 7, on which a driver's seat 8 is provided so as to be slidable left and right. A steering handle 9 is provided in front of the driver's seat 8, and its steering shaft IO
extends toward the front end of the vehicle body frame 2, and is configured to steer the front wheels 3 and rear wheels 4 via the steering gear case 11.

A Mitsushiron case I2 is provided on the vehicle body frame 2 immediately behind the steering gear case 11, and within this mission case 12 are a hydraulic transmission mechanism (not shown), a front wheel differential, a rear wheel differential 13, a PTO transmission mechanism, and a rear wheel brake mechanism. etc., and the overall weight is heavy.

The Mitsushiron case 12 receives power from the output shaft of the engine 6 via the clutch mechanism, transmits the power to the front wheels 3, and also transmits the power to the rear wheels 4 via the rear wheel transmission shaft 14.
The front wheels 3 and rear wheels 4 are respectively driven for four-wheel drive driving. Also, from mission case 12,
Power is transmitted via a transmission shaft 15 to a transmission box 16 provided at the rear end of the vehicle body frame 2 .

A pair of left and right support frames 17 are provided at the rear of the vehicle body frame 2.
The base end of a parallel link 18 is pivotally supported on this support frame 17, and a hydraulic cylinder 19 is provided between the base end of the parallel link 18 and the vehicle body frame 2, and a hydraulic cylinder 19 is provided between the base end of the parallel link 18 and the vehicle body frame 2. The link 18 is rotated to move the rear end side up and down. A six-row transplant section 21 is connected to the rear end of the parallel link 18 via a rolling section 20 so as to be able to roll left and right. A fertilizer @ 22 is disposed between the transplant portion 21 and the driver's seat 8 and is supported by the upper end of the support frame 17 .

The transplanting section 21 has a main body frame 23 provided with a seedling mounting table 24 located on the upper side, on which seedlings for transplantation are placed, and which moves back and forth from side to side with a predetermined stroke, and a center float 25 on the lower side. On the left and right sides of the center float 25, a side foot 26.
Seedlings are taken out one by one from a seedling outlet (not shown) provided at the sloping lower end of the seedling platform 24 and planted in the field while rotating in the direction of movement of the machine. The attachment has a body 27°27... Seedling planting is body 2
7.27... When planting seedlings, the distance between the center float 25 itself and the distance between the center float 25 and the side floats 26 is 26.26.
The relationship S>s is set such that the interval S between the two is larger than the other.

Further, the center float 25 is supported by a link mechanism to be able to vibrate up and down with respect to the main body frame 23, and a hydraulic switching valve (not shown) that is switched by the vertical movement of the center float 25 is provided near the link mechanism. , the hydraulic cylinder 19 is telescopically operated by this hydraulic switching valve, and the transplant portion 2 is connected via the parallel link I8.
1 is raised and lowered, and the ground pressure of flow 25 and 26 is kept almost constant, and the seedlings are planted by the body 27 so that the depth of the seedlings is almost constant. code 24
A is a seedling guide provided at the upper end of the seedling platform 24.

The fertilizer application system @22 applies fertilizer to the sides of the seedlings to be planted by the transplanting section 2I.A fertilizer hopper 28 for storing powdered/granular fertilizer is provided in the upper part, and a fertilizer hopper 28 that receives the power from the transmission box 16 is provided in the lower part. A feeding section 30 is provided which receives power via a feeding link 29 and is intermittently driven to feed out the fertilizer in the hopper 28 downward by a predetermined amount, and a front and rear passage 31 through which the fertilizer fed out from the feeding section 3o falls. At the same time, an air chamber 32 extending in the left-right direction on the front side of the front-rear passage 31 and also serving as a frame is disposed in communication with the air chamber 32 , and the bottom of the air chamber 32 is supported by the upper end of the support frame 17 . An air pipe 34 from an air blower 33 is communicated with the front part of the air blower 33. The upper end of a fertilizing hose 35 made of a flexible synthetic resin bow is communicated with the rear end of the front and rear passage 31, and this fertilizing hose 35 extends to the side of the flow 25 and 28, and its lower end. A fertilization nozzle 36 is connected to the fertilization nozzle 36, and an open groove plate 37 is attached to the front side of the fertilization nozzle 36.

In addition, the reference numeral 38 indicates the connection from the transmission box I6 to the transplantation section 2.
It is a transplant part transmission shaft that transmits power to 4.

As shown in FIGS. 3 and 4, rotation support parts 39.39 are provided at both ends of the rear wheel support frame 4a, and a rear wheel transmission part 40 extends downward from the rotation support parts 39.39. .4
0 is supported so as to be rotatable in a substantially horizontal direction. Power is transmitted to the rear wheel transmission section 40.40 from the mixer case I2 via the rear wheel transmission shaft 14, and the rear wheel transmission section 40.40 rotationally drives the rear wheel shaft 4b, and is fixed to the rear surface of the rear wheel support frame 4a. Piston 41a of hydraulic cylinder 41 for rear wheel steering,
41a are linked. As shown in FIG. 1, the steering angles of the front wheels 3, 3 and the rear wheels 4, 4 are such that, as shown by the imaginary lines, the steering angles of the front wheels 3, 3 on the inside in the steering direction are larger than those on the outside. In 4.4, both the left and right wheels are almost the same, and are much smaller than the front wheels 3, 3.The maximum steering angle for the rear wheels 4, 4 is as shown by the imaginary line in Figure 1. The rotation range is set to be smaller than the leveling width of the side floats 25, 25 that level the track of the rear wheels 4, 4.

Furthermore, as shown in FIGS. 5 and 7, the four-wheel steering mechanism is linked to an electromagnetic clutch unit 44 via a switch 43 so that planting is linked to the engagement and disengagement of a clutch lever 42. There is. Figure 5 shows the clutch lever for planting.
42 is large, the front wheels 3.degree. 3 and the rear wheels 4, 4 are steered in the same direction (same phase). At this time, as shown in Fig. 6, when the rice transplanter performs work while traveling straight and changes its course, the conventional rice transplanter is indicated by the dotted line B.
In contrast, in the case of the present invention, the vehicle travels by drawing a traveling line shown by solid line A, so that there is no waste in the traveling trajectory. Figure 7 shows planting when the clutch lever 42 is in the OFF position, and the front wheels 3, 3 and rear wheels 4, 4 are in opposite directions (in opposite phases).
is steered by. At this time, as shown in FIG. 8, when the rice transplanter turns on the headland, the conventional rice transplanter turns along a running line indicated by dotted line B, whereas in the case of the present invention, it turns along a solid line A. It is possible to make a turn by drawing a running line as shown in the figure, thereby reducing the turning radius. In this case, since the side clutch is disengaged when the aircraft turns, the turning performance is not much different between the two, but since the outer rear wheels 4, 4 are oriented tangentially to the turning circle, the amount of mud lifted by the wheels is reduced. .

The steering angles of the front wheels 3, 3 and the rear wheels 4, 4 can be set in various ways, but as shown in FIG.
θb1 When the steering angle of rear wheels 4, 4 is θC9θd, θ
The relationship is set such that a>θb>θcL:Iθd.

In the riding type rice transplanter having such a configuration, when carrying out work, the riding vehicle body 1 is driven and introduced into a field (paddy field) where seedling transplantation and fertilization work is to be performed. And hydraulic cylinder +
9. The transplanting part 21 is lowered by the parallel link 18, and the flow) 25, 26 is grounded on the rice field, and the passenger vehicle body l is run in this state, and at the same time, the transplanting part 21 and the fertilizing device f are lowered.
By operating ii22, transplanting of seedlings and fertilization are performed simultaneously.

At this time, when the aircraft is traveling straight, the clutch lever 42 is in the engaged state (Fig. 5), so when the steering wheel 9 is operated, the front wheels 3°3, the rear wheels 4,
4 are steered in the same direction (same phase). As shown in FIG. 6, when changing course, the vehicle travels along a travel line indicated by a solid line A, so that there is no waste in the travel trajectory. Also, when the machine comes to the edge of the field and turns, the clutch lever 42 is in the disengaged state (Fig. 7) for planting.
When the steering handle 9 is operated, the front wheels 3, 3 and the rear wheels 4, 4 are steered in opposite directions (in opposite phases).

Then, as shown in Fig. 8, the vehicle turns along the running line shown by the solid line A, and the turning radius becomes small, and the outer rear wheels 4.4 face tangentially to the turning circle. Mud lifting is reduced.

Also, when the front wheels 3.3 and the rear wheels 4, 4 are steered,
The rotation range due to the maximum steering angle of the rear wheels 4, 4 is smaller than the leveling width of the side floats 26.28, and the seedling planting distance in the side floats 26.26 is set at the spacing S, while that in the center float 25 is Spacing and Side Flow) Since the seedling planting distance between 26.26 and the center float 25 is larger than the spacing S, the rear wheels 4.4 can obtain a sufficient steering angle while their travel traces reach the side float 26. .26, and the seedling planting is done by the body 27, which improves the accuracy of seedling planting.

In the passenger vehicle body 1, work is performed in a state where the rear wheels 4 can be rolled around the rolling shaft 5 and the transplanted part 21 can be rolled around the rolling part 20. The passenger vehicle body l runs in a four-wheel drive state by driving the front wheels 3 and rear wheels 4, respectively, and the rear wheels 4 may roll, even in conditions where the driving base is not good, such as in rice fields. It is possible to run stably with almost no slippage, and the balance of the aircraft is good (and stable running performance9 workability can be obtained).

In the transplanting section 21, the floats 25 and 26 level the rice field by sliding while touching the rice field, and the body 27 rotates in a rotary manner to plant seedlings on the leveled rice field.
Seedlings are taken out one by one from a seedling take-out port at the sloping lower end of a seedling platform 24 which is loaded with seedlings and reciprocated from side to side, and planted in a circle. In addition, the transplant section 21 includes a rolling section 20.
Since it is possible to roll left and right in the flow) 25.
28 is in contact with the ground, rolling against the parallel link 18, and planting seedlings on both left and right end sides of the laterally long transplanting part 21 does not cause unevenness in depth. When the passenger vehicle body 1 pitches and the transplant portion 2I moves up and down via the parallel link I8, the center float 25 moves along with this up and down movement.
vibrates up and down to switch the hydraulic pressure valve, expands and contracts the hydraulic cylinder 19 to raise and lower the transplanted part 21 via the parallel link 18, and maintains the ground pressure of flow) 25.26 almost constant. When planting seedlings, the depth of transplanted seedlings that are planted by the body 27 and the depth of the fertilization groove that is circularly opened by the groove plate 37 are almost constant.

In the fertilizer application device 22, the powdered/granular fertilizer stored in the fertilizer hopper 28 is intermittently fed downward from the feeding section 3o at predetermined intervals and falls into the front and rear passages 31. It is blown backward by the pressure wind of 32 and passes through the fertilizing hose 35 to the fertilizing nozzle 3.
6, and from there, the fertilizer is applied to the fertilization groove opened in the rice field by the opening board 37. The roots of the transplanted seedlings then absorb the fertilizer and grow.

It should be noted that the present invention is not limited to the rice transplanting machine of the above embodiment, but can be similarly applied to, for example, a transplanting machine for Satsatsu rape seedlings, a transplanting machine for germinated seeds, and the like.

〔Effect of the invention〕

As explained above, according to the riding rice transplanter equipped with the four-wheel steering mechanism of the present invention, the steering angle of the front wheels and the rear wheels is made smaller than that of the front wheels, and the rotation range of the rear wheels due to steering is is made smaller than the grading width of the grading float for the rear wheels, so turning and steering performance can be improved by rationally combining the running trajectories of the front and rear wheels.

In addition, the trail of the rear wheels is leveled by a leveling float,
Seedlings are planted in the leveled area, and the accuracy of seedling planting can be improved.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of the entire riding rice transplanter showing an embodiment of the present invention, FIG. 2 is a side view of the entire riding rice transplanter, and FIG. 3 is a perspective view of the rolling section of the rear wheel and the steering section. FIG. 4 is a plan view of the same, FIGS. 5 to 8 are diagrams for explaining the second action, and FIG. 9 is a diagram for explaining the steering angle. l... Passenger vehicle body, 2... Body frame, 3...
・Front wheel, 4... Rear wheel, 5... Rolling axis, 6...
・Engine, 7... Engine cover, 8... Driver's seat, 9... Steering handle, 10... Steering shaft, 11... Steering gear case, 12...
・Mission case, 13... Rear wheel differential, 14...
- Rear wheel transmission shaft, 15... Transmission shaft, 16... Transmission box, I7... Support frame, 18... Parallel link, 19... Hydraulic cylinder, 20... Rolling Part, 21... Transplanting part, 22... Fertilization device, 23
...Body frame, 24...Seedling stand, 25...
Center float, 26...Side float, 27.
... Seedling planting body, 28... Fertilizer hopper, 29... Link for feeding out fertilizer, 30... Feeding part, 31...
・Front and rear passage, 32...Air chamber that also serves as frame, 33...Blower, 34...Blow pipe, 35...
- Fertilizer hose, 36... Fertilizer nozzle, 37... Groove plate, 38... Transplant part transmission shaft, 39... Rotation support part,
40... Rear wheel transmission unit, 41... Hydraulic cylinder for rear wheel steering, 42... Planted clutch lever 143... Switch, 44... Electromagnetic clutch unit.

Claims (1)

[Claims] A transplanted portion having a float is attached to the rear part of a passenger vehicle body having a pair of left and right front wheels and a rear wheel, and a mechanism for simultaneously steering the front and rear wheels. In the riding rice transplanter, the steering angles of the front wheels and rear wheels are set so that the rear wheels are smaller than the front wheels, and the rotation range of the rear wheels due to steering is
A riding rice transplanter equipped with a four-wheel steering mechanism, characterized in that the width of the ground is smaller than the leveling width of a float that is provided behind the rear wheels and levels the track of the rear wheels.