JPH0143988Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is equipped with an engine and a transmission case in the front, and a seedling planting device in the rear. This invention relates to a walking rice transplanter with a float installed at the lower center.

This type of walk-behind rice transplanter uses the wheels placed between the front and rear of the machine as a ground fulcrum, and the engine, transmission case, and seedling planting device are arranged in a well-balanced manner in the front and back, which balances the weight of the machine. In order to improve this, the machine is further configured to maintain a constant posture with respect to the rice field by moving the propulsion wheels up and down based on the sensor operation of the float, which moves up and down in accordance with the ups and downs of the tiller. However, in this case, the structure for vertically moving the propulsion wheels is such that the front base end of the wheel transmission case is pivotally connected to the left and right sides of the transmission case so as to be able to swing vertically. The propulsion wheel is pivotally supported at the free end, and the upper limit position of the vertical movement range of the wheel is set in a state where the wheel transmission case is in a horizontal position, based on the relative positional relationship with the aircraft body. As shown in FIG. 4, the horizontal distance 0L between the wheel grounding points 0P and 0P', which fluctuates due to the vertical rocking of the wheels 08, becomes large, causing the weight balance of the aircraft to be disrupted. . In a deep field where the wheel transmission case is swung downward, the wheel grounding point moves forward with respect to the machine body, and the center of gravity of the machine moves backward with respect to the wheel grounding point. However, due to the reverse torque, the moment that tends to cause the machine to overturn itself to the rear increases, and the tendency of the machine to tilt backwards increases, resulting in poor maneuverability as a walk-behind rice transplanter.

In view of the above circumstances, the present invention aims to provide a device that has a simple structure, suppresses the loss of weight balance as much as possible, and minimizes the influence on the ground float width.

The characteristic configuration of the walking type rice transplanter according to the present invention, which has been made to achieve the above object, is that an output case portion, which overlaps the float when viewed from the side, is extended downward on both left and right sides of the transmission case. The front base end of the wheel transmission case is pivotally connected to the output case part so as to be able to swing vertically, and the propulsion wheel is pivotally supported at the rear free end thereof, and the output case part is connected to the output case part with respect to the wheel transmission case. This is because the propulsion wheels are placed on the same side.

The effects of the present invention having such a characteristic configuration are as follows.

In other words, by simply adding the output case portion, the position of the swinging fulcrum at the base end of the wheel transmission case can be changed compared to the conventional structure without changing the vertical movement position of the wheel relative to the aircraft body. In order to lower the base end position of the transmission case to a position where it overlaps with the float, for example, a notch is provided in a part of the grounding float to extend the transmission case downward. In this case, the proximal end of the transmission case is not pivotably supported by its extension portion in a vertically swingable manner, so it is possible that the notch portion of the float may be clogged with mud due to the configuration. As shown in FIG. 3, the base end position of the wheel transmission case can be located at an intermediate height of the vertical movement range of the wheel without causing any damage to the grounding point when the wheel vertically swings. The horizontal distance L between P and P' can be made small, and it has become possible to reduce the loss of the weight balance of the machine body due to the vertical swing of the wheels.

Furthermore, when the wheel transmission case is supported by the output case part, the output case part and the propulsion wheel are disposed at the same lateral position with respect to the wheel transmission case, that is, the wheels are supported by the output case part. Since the wheel transmission case 014 and the wheel 08 are located at the same width position in the lateral direction of the fuselage as shown in FIG. and the output case part located below the mud surface during the work in Fukada,
The width length occupied by the wheel transmission case and the wheels can be shortened, and the mud pushing caused by these can be reduced, thereby eliminating any negative impact on the already planted seedlings.

Furthermore, as shown by the imaginary line in FIG. 5, when the distance between the wheels 08 is constant, the float 09
Since the width can be made large, a stable grounding posture of the float can be obtained while forming a gap for good mud flow.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIGS. 1 and 2, an engine 1 and a transmission case 2 are provided at the front, and a transmission case 3 that also serves as a machine frame is installed from the transmission case 2 toward the rear of the aircraft. Seedling planting device A is extended and further comprises a planting case 4 at the rear end of the transmission case 3, a planting mechanism 5, a seedling stand 6, and a handle 7 located on the back side of the seedling stand 6. The fuselage consists of a pair of left and right propulsion wheels 8, 8, which are arranged in the middle of the front and back of the fuselage so as to be able to swing up and down, and a float 9, which is installed at the lower center of the fuselage.
Accordingly, the walking rice transplanter is configured to be able to move up and down to maintain a constant posture with respect to the rice field.

The vertical swinging mechanism of the propulsion wheels 8, 8 will be described in detail. As shown in FIG. A transmission gear 10 is loosely fitted into the joint, and clutch pieces 12a, 1 are spline-fitted on both sides of the transmission gear 11.
A steering clutch 12, 12 is provided having a steering clutch 2a.
Output case parts 2A, 2A, which have gear transmission mechanisms 13 installed at both ends of the transmission shafts 10a, 10b, extend downward so as to overlap with the float 9 in side view. The front base ends of the wheel transmission cases 14, 14 are pivotally connected to the lateral inner side so as to be able to swing vertically, and the propulsion wheels 8, 8 are pivotally supported on the outer side of the rear free ends. Leveling plates 17, 17 are provided behind the propulsion wheels 8, 8.

An arm 1 is provided at the front base end of the wheel transmission cases 14, 14 and is movable in conjunction with the cases 14, 14.
5, 15 are erected, and the cases 14, 1
A connecting rod 16, 1 is interlocked and connected to a piston rod of a hydraulic cylinder (not shown) that controls the vertical movement of 4.
6 and the upper ends of the arms 15, 15 are connected so as to be relatively swingable, and furthermore, a control valve (not shown) for controlling the hydraulic cylinder and the float 9 are interlocked and connected by a link mechanism. The wheels 8, 8 are moved up and down in the opposite direction to the float 9 by the vertical movement of the float 9 due to the ups and downs of the tiller, so that the machine body can always maintain a constant planting posture with respect to the rice field. It has been done.

In addition, as a configuration in which the output case portion 2A and the propulsion wheel 8 are arranged on the same side of the wheel transmission case 14, the wheel transmission case 14 is arranged at the position shown by the imaginary line in FIG. float 9
It is also possible to configure the ground contact width to be large.

[Brief explanation of the drawing]

The drawings show an embodiment of the walk-behind rice transplanter according to the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an enlarged partially cutaway plan view of the main part, and Fig. 3 is a schematic diagram showing the vertical swing range of the wheels. FIG. 4 is a schematic view showing the vertical swing range of a conventional wheel, and FIG. 5 is an enlarged partially cutaway plan view of the main part showing a comparative example. 1... Engine, 2... Mission case, 2
A... Output case portion, 8... Propulsion wheel, 9... Float, 14... Wheel transmission case, A... Seedling planting device.

Claims (1)

[Scope of utility model registration request] The engine 1 and transmission case 2 are installed in the front part, and the seedling planting device A is installed in the rear part.A pair of left and right propulsion wheels 8, 8 are arranged in the middle of the front and back, and are vertically adjustable. 9, output case portions 2A, 2A extending downward from both left and right sides of the transmission case 2 and overlapping with the float 9 in side view; Part 2A, 2A
The front base ends of the wheel transmission cases 14, 14 are pivotally connected to be vertically swingable, and the propulsion wheels 8, 8 are pivotally supported at the rear free ends thereof. A walking rice transplanter in which the output case part 2A and the propulsion wheels 8 are arranged on the same side.