JPH0644327Y2 - Left and right wheel swing mechanism of walking type rice transplanter - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a left and right wheel swing mechanism of a walk-behind rice transplanter.

(B) Conventional technology Conventionally, the left and right wheel swing mechanism in the walk-behind rice transplanter is
Hydraulic cylinders for swinging left and right wheels are attached to the front part of the machine body, and the center of the horizontal sliding arm is swingably pivoted forward and backward at the end of the expandable rod of the hydraulic cylinder. Connect the front ends of a pair of swing rods to
The rear end of the swing rod is connected to the swing cases of the left and right wheels.

With such a configuration, when the water depth of the rice field becomes deep, the water depth detection sensor operates to advance the telescopic rod of the hydraulic cylinder, and the left and right wheels are cultivated through the horizontal sliding arm → swing rod → swing arm → swing case. By pressing, the airframe can be lifted and the airframe itself can be prevented from settling in the mud.

On the other hand, depending on the condition of the tiller, when one of the left and right wheels becomes lower and the other becomes higher, the horizontal sliding arm automatically swings back and forth around the central fulcrum as the swing center. , Horizontal direction, that is, horizontal adjustment can be performed.

(C) Problems to be Solved by the Invention However, the left and right wheel swing mechanism still has the following problems.

That is, there is no gap between the horizontal sliding arm and the machine body when the machine is at the lowest position, that is, when the hydraulic cylinders for swinging the left and right wheels are finally retracted. Since it cannot be swung in the front-back direction around the rocking center, even if there is unevenness in the left-right direction (width direction) on the tiller, it cannot be countered at all, and horizontal adjustment by rolling can be performed at all. become unable.

An object of the present invention is to provide a left and right wheel swing mechanism of a walk-behind rice transplanter that can solve the above problems.

(D) Means for solving the problem In the present invention, a hydraulic cylinder for swinging the left and right wheels is attached to the front part of the machine body, and the telescopic rod tip of the hydraulic cylinder is
The center of the horizontal sliding arm is swingably supported in the front-back direction, the front ends of a pair of swing rods are connected to both ends of the horizontal sliding arm, and the rear ends of the swing rods are connected to the left and right wheels. In the left and right wheel swing mechanism of the walk-type rice transplanter, which is connected to the swing case via the swing arm, the longitudinal movement length of both ends of the horizontal sliding arm is longer than the stroke of the left and right wheel swing hydraulic cylinders, and At the most forward position of the horizontal sliding arm, a stopper for restricting the swing of the horizontal sliding arm is provided, and at the last retracted position, a gap is provided between the horizontal sliding arm and the rear stopper of the machine body. The left-right wheel swing mechanism of the walk-type rice transplanter is characterized in that the horizontal sliding arm is swingable in the front-rear direction at the last retracted position.

(E) Operation and Effect With the above configuration, the present invention has the following operation and effect.

According to the present invention, the horizontal sliding arm does not contact the rear stopper of the vehicle even when the vehicle is at the lowest position, that is, when the left and right wheel swing cylinders are finally retracted. It is possible to rotate back and forth around the center of motion, and it becomes possible to roll, and the machine body can be held horizontally even when the machine body is lowered, regardless of changes in the tiller in the left-right direction.

In particular, the horizontal sliding arm can be locked at the most advanced position by a stopper and is free at the last retracted position, improving both stability in Fukada and flexibility in Asada. You can

(F) Embodiment Hereinafter, the present invention will be specifically described based on an embodiment shown in the accompanying drawings.

FIG. 1 is a side view showing a walk-behind rice transplanter A with four-row planting, and FIG. 2 is a plan view of the same.

A prime mover section 2 is mounted on the front of the machine body 1, and a mission section 3 is provided behind it. From the mission section 3, a shaft case 4 is provided directly behind the mission section 3, and the left and right sides of the mission section 3 are provided. From the side, the left and right transmission shaft cases 5, 5'having a substantially L shape are separately extended.

At the rear end of the shaft case 4, there is a planted mission case 6
Are continuously installed, and the base end of the planting frame 7 is continuously installed in the planting mission case 6, and the planting frame 7 is
It is extended and formed rearward and the handle 8 is attached to the upper end,
A seedling stand 10 having a front low front height and a rear rear high height capable of mounting four rows of seedling mats is continuously provided at a midway portion through a seedling stand supporting frame 9.

In the mission case 6 with planting, of the four-row seedling planting mechanism,
Inner 2 rows of seedling planting mechanism 11,11 'are installed in series (second
See figure).

Furthermore, the left and right transmission shaft cases 5 and 5'consecutively provided on the left and right lateral sides of the mission unit 3 include left and right horizontal overhanging cases 12 and 12 'that horizontally project from the mission unit 3 to the left and right outside, and the respective horizontal overhanging cases. It is composed of left and right longitudinal cases 13, 13 'that are connected in a rearward direction from the tips of 12, 12'.
14 'are connected to each other, and in the gear case 14, 14', of the four row seedling planting mechanisms, the outermost two row outer lateral seedling planting mechanisms 15,1
5'is lined up.

16, 16 'are swing cases that are linked to the left and right sides of the mission unit 3, and 17, 17' are swing cases 16, 16 '.
The left and right wheels are connected to each other, 18 and 18 'are side floats arranged on both sides of the body, and 19 is a center float.

In the above configuration, the present invention is characterized by the structure of the left and right wheel swing mechanism S that can independently swing the left and right wheels 17, 17 'vertically via the swing cases 16, 16'.

Hereinafter, the configuration of the left and right wheel swing mechanism S will be described in detail with reference to FIGS. 3 to 5. As shown,
The machine body 1 is provided with a hydraulic cylinder 20 for swinging left and right wheels, which extends in the axial direction of the rice transplanter A, in the center of the front part of the machine body.
It is connected to and supported by 20a.

Further, the telescopic rod 21 of the hydraulic cylinder 20 for swinging the left and right wheels moves in the rectangular space B provided inside the machine body 1 in the rice transplanter A.
Can be moved back and forth in the axial direction, and at the tip of the telescopic rod 21, the center of the horizontal sliding arm 22 whose width is substantially equal to the width of the rectangular space B can be swung back and forth by the pivot 22a. It is pivotally supported.

In addition, front ends of a pair of swing rods 23, 23 ', which are arranged in parallel on both sides of the left and right wheel swing hydraulic cylinders 20 at parallel intervals, are connected to both ends of the horizontal sliding arm 22. At the rear end of the swing rods 23, 23, a swing arm pivotally supported around the central portion around a pivot 24 is provided.
One end of 25, 25 'is connected to the swing arm 25, 25'.
The other end of 25 'is connected to the left and right wheels 1 through the connecting arms 26, 26'.
Swing case 16,16 'with 7,17' attached integrally
Is connected with.

With this configuration, when the water depth of the rice field becomes deep, a water depth detection sensor (not shown) is activated to advance the telescopic rod 21 of the hydraulic cylinder 20 for swinging the left and right wheels to move the horizontal sliding arm.
22 → Swing rod 23,23 ′ → Swing arm 25,25 ′ →
The left and right wheels 17, 17 'are pressed against the cultivator through the swing cases 16, 16', whereby the machine body 1 is lifted and the machine body 1
Can be adjusted horizontally to prevent the machine body 1 itself from settling in the mud.

On the other hand, depending on the condition of the cultivator, if either of the left and right wheels 17, 17 'becomes lower and the other becomes higher, the horizontal sliding arm 22 will automatically move back and forth around the central fulcrum as the swing center. By swinging in the horizontal direction, horizontal adjustment in the left-right direction, that is, the width direction can be performed.

In the present invention, the horizontal sliding arm 22 is further
Even in the final retreat position (the position where the aircraft 1 is at the lowest position),
It is characterized in that it can swing in the front-back direction.

That is, as shown in FIG. 4, the horizontal sliding arm 22 still has the rear stoppers 27, 2 of the machine body 1 even in the final retracted position.
A sufficient gap l is maintained between the horizontal sliding arm 22 and the left and right wheels 17,1 and 7 '.
Even if there is a change in the height relationship between the 7'and the cultivator, it can be swung in the front-rear direction with the central part as the swing center, and the left and right wheels 17, 17 'are rolled to adjust the level of the machine body 1 horizontally. It can be performed.

Further, in the illustrated embodiment, the leveling of the machine body can be performed even when the machine body is lifted up.

That is, as shown in FIG. 4, the airframe 1 is provided with a bumper 30 extending in the width direction at the tip thereof.
Has protruding brackets 31, 31 'on the inner surfaces of both ends thereof.

Further, stoppers 32 and 32 'are attached to the brackets 31 and 31, and the stoppers 32 and 32' are attached to the stoppers 32 and 32 'at the uppermost position of the machine body (that is, when the left and right wheel swing cylinder 20 is at the most advanced position). , The front surface of the horizontal sliding arm 22 comes into contact with the lateral sliding arm 22, and the left and right inclinations of the machine body 1 are determined.

The stoppers 32, 32 'are formed by advancing and retracting bolts whose length is adjustable, and both stoppers 32, 32' are
The horizontal sliding arm 22 can be slightly oscillated in the front-rear direction by changing the length of the body 1 to horizontally adjust the machine body 1.

Further, FIG. 5 shows a modified example of the above-mentioned structure, which is characterized in that stoppers 32, 32 'whose lengths can be adjusted can be brought into contact with both ends of the horizontal sliding arm 22.

Note that the other configurations in this embodiment will be described below.

In FIG. 3, reference numeral 40 denotes an engine mounted on the machine body 1, and the engine 40 and the hydraulic pump 41 for driving the hydraulic device are mounted on the machine body 1 with a space in the front-rear direction.

The power generated by the engine 40 is transmitted to the hydraulic device driving hydraulic pump 41 by the power transmission belt 42, and a part of the transmitted power is transmitted to the mission unit 3 by the power transmission belt 43. become.

Further, in FIGS. 3 to 5, the bumper 30 is provided with a bracket 45 on the back surface thereof, and the pivot 46 provided on the bracket 45 has a float support rod 48 having a vertically elongated hole 47.
Are slidably engaged in the vertical direction, and the lower end of the support rod 48 is pivotally connected to a bracket 49 provided on the upper surface of the tip of the center float 19.

Furthermore, in FIG. 3, a hydraulic pump 41 for driving the hydraulic device is shown.
A fuel tank 50 is disposed above the fuel tank 50, and the fuel tank 50 is attached to the upper portion of the fuel tank stay 51.
The lower end of the fuel tank stay 51 is the mission case.
Sticked to 52.

[Brief description of drawings]

FIG. 1 is an overall side view of a four-row planting walk type rice transplanter equipped with a left and right wheel swing mechanism according to the present invention, FIG. 2 is a plan view thereof, and FIGS. 3 to 6 are enlarged explanatory views of main parts. is there. In the figure, A: Walk-type rice transplanter 1: Airframe 2: Engine part 3: Mission part 16,16 ': Swing case 17,17': Left and right wheels 20: Hydraulic cylinder for left and right wheels swing 22: Horizontal sliding arm 23 , 23 ': Swing rod 25,25': Swing arm 27: Rear stopper 32,32 ': Stopper l: Gap

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuichi Yoshikawa Inventor Yuichi Yoshikawa 1-32, Chayamachi, Kita-ku, Osaka City, Yanmar Agricultural Machinery Co., Ltd. (56) References

Claims (1)

[Scope of utility model registration request] Claims: 1. A hydraulic cylinder (20) for swinging left and right wheels is attached to the front part of the machine body (1), and the hydraulic cylinder (20) is attached.
The center part of the horizontal sliding arm (22) is swingably supported in the front-back direction at the end of the telescopic rod (21) of, and a pair of swing rods (23) are provided at both ends of the horizontal sliding arm (22). ) (23 ') are connected to each other, and the rear ends of the swing rods (23) and (23') are connected to the swing cases (16) of the left and right wheels (17) and (17 ').
(16 ') and swing arm (25) (25') In the left and right wheel swing mechanism of the walker type rice transplanter, the horizontal movement length of both ends of the horizontal sliding arm (22) A stopper (32) (which restricts the swing of the horizontal sliding arm (22) at the forwardmost position of the horizontal sliding arm (22) and is longer than the stroke of the wheel swing hydraulic cylinder (20). 32 ') is provided, and a gap (l) is formed between the lateral sliding arm (22) and the rear stopper (27) of the machine body (1) in the final retracted position, and in the final retracted position, the same gap is formed. A left-right wheel swing mechanism for a walk-type rice transplanter, characterized in that a horizontal sliding arm (22) is configured to be swingable in the front-rear direction.