JPH048210A - Two-wheeled walking-type paddy-field working machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a two-wheeled walking type paddy field working machine such as a walking type rice transplanter or a walking type direct sowing machine.

[Conventional technology]

In a walk-behind rice transplanter, which is one of the two-wheeled walk-behind paddy field working machines, as disclosed in, for example, Japanese Patent Application Laid-open No. 1-132308, a pair of left and right running wheels are arranged so that when one goes up, the other goes down. As I said, there are some devices that have a structure that drives them up and down in a contradictory manner.

As a result, even if the tiller on which the wheels run is uneven, the machine can be kept parallel to the field by moving the left and right wheels up and down in opposite directions.

[Problem to be solved by the invention]

In the above-mentioned structure, a hydraulic cylinder ((22) of the above-mentioned publication) that drives the wheels up and down in a reverse manner is arranged on the sideways portion of the transmission case for traveling ((2) of the above-mentioned publication).

Therefore, in a walk-behind rice transplanter that travels in soft paddy fields, if the hydraulic cylinder is placed on its side as described above, the balance between the left and right sides of the machine is likely to collapse, and even if the machine is going straight, the hydraulic cylinder There is a risk that it will gradually change direction to the side.

Here, the present invention aims at achieving good left-right balance of a two-wheeled walking type paddy field working machine.

[Means for Solving the Problems] A feature of the present invention is that the two-wheel walking type paddy field work machine as described above is configured as follows. In other words, the mission case for traveling is located at the front of the aircraft and is offset to one side from the left and right center of the aircraft, and the hydraulic cylinders that drive the pair of left and right wheels up and down in a contradictory manner are located at the front of the aircraft. They are arranged side by side on the mission case so as to be located on the opposite side of the deflection direction of the mission case from the left and right center, and their functions and effects are as follows.

[For production]

If the hydraulic cylinders are arranged side by side on the sideways portion of the mission case as in the conventional structure, the center of gravity of the aircraft will move from the left and right center of the aircraft towards the hydraulic cylinders.

However, if the mission case is deviated to the opposite side from the hydraulic cylinder as in the present invention, the movement of the center of gravity of the aircraft due to the hydraulic cylinder can be suppressed and the center of gravity of the aircraft can be located at the center of the left and right sides of the aircraft. It is.

Furthermore, when the mission case is deviated from the left-right center of the fuselage to one side, the space between the wheels and the side of the mission case opposite to the direction of deviation becomes wider. Therefore, when a hydraulic cylinder is arranged within this space, it can be arranged with sufficient space without giving any spatial strain to other structures.

〔Effect of the invention〕

As described above, even if a hydraulic cylinder is installed to drive the wheels up and down against each other, the center of gravity of the aircraft can be kept at the center of the left and right sides of the aircraft, and the aircraft will not gradually change its direction when traveling straight. This made it possible to improve the running stability of the two-wheeled walking paddy field work machine.

Furthermore, since the hydraulic cylinder can be arranged without any difficulty, the hydraulic cylinder does not impose spatial strain on other structures and cause failures.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in Figure 8, the running case (1
) A pair of transmission cases (2) are located on both the left and right sides of the horizontal axis (P
This transmission case (
2) Wheels (3a) for running at the end.

(3b) is provided to support the aircraft. and,
The rear of the aircraft is equipped with a seedling planting device consisting of a planting arm (4), a seedling stand (5), etc., a control knob (6), and a mission case (1) and a planting arm (5).
4) is provided with a tank (7) and a feeding device (8) for feeding out the fertilizer in the tank (7).

At the bottom of the fuselage, a center float (9) can freely swing up and down around the horizontal axis (P2) at the rear of the fuselage, and around the longitudinal axis (P2).
3) It is attached so that it can be rolled around. A groove maker (10) that makes a groove in the rice field is fixed to this center float (9), and the fertilizer fed out from the feeding device (8) passes through the hose (11) to the groove maker (10). It is sent into the groove made by. As described above, a walking rice transplanter, which is an example of a two-wheeled walking rice paddy working machine, is constructed.

As shown in FIG. 8, a forward-sloping frame (13) is fixed to the front of the transmission case (1), and a gasoline engine (12) is mounted on this frame (13).
A gasoline engine (12) is supported in a forward and downward tilted position.

Next, the vertical drive structure of the left and right wheels (3a) and (3b) will be explained. As shown in Figure 1.7.8, a single-acting first hydraulic cylinder (
18) is connected to the rear end of this first hydraulic cylinder (18).
) is facing towards the rear of the aircraft. A support arm (20) is fixed to the tip of the piston rod (18a) of the first hydraulic cylinder (18).
) A pair of upper and lower balance arms (21
) is attached so that it can swing freely. This balance arm (21) is attached to the long holes (13a) on the left and right sides of the frame (13).
), and a pair of left and right rods F'' (22) are constructed and connected between both ends of the balance arm (21) and the arm (2a) at the base of the transmission case (2).

With the above structure, when the first hydraulic cylinder (18) is expanded or contracted, the left and right transmission cases (2) and wheels (3a)
, (3b) are driven to swing up and down in the same direction.

Then, as shown in FIGS. 1 and 7, the support arm (2
0) and the bracket fixed to the left rod (22))
(23) and a double-acting second hydraulic cylinder (24).
) are constructed and connected. With this structure, for example, the second
When the hydraulic cylinder (24) is extended, the left transmission case (2) and the wheels (3b) are driven to swing downward. In conjunction with this operation, the balance arm (21) is swung counterclockwise in FIG. 1 via the rod (22), and the right transmission case and wheel (3a) are swung upward. Ru. In other words, by expanding and contracting the second hydraulic cylinder (24), the left and right transmission cases (2) and the wheels (3)
It is possible to perform vertical driving that is contradictory to a) and (3b).

Further, as shown in FIGS. 1 and 7, a locking member (64) that can be freely swung is attached to the lower balance arm (21) around the fir axis (P,). In the state shown in FIG. 7, the left and right wheels (3a) are controlled by the second hydraulic cylinder (24).
), (3b) is in a state in which the contradictory vertical movement can be performed. Then, the locking member (64) is connected to the wire (65).
The bottle (20a) of the support arm (20) is
By engaging the lock member (64) in the first recess (64a), the left and right wheels (3a) and (3b) can be fixed in a position parallel to the fuselage. Also, a bottle (20a
) in the second recess (64b) or the third recess (64b) of the locking member (64).
By engaging the recess (64c), the left wheel (3
b) can be fixed in a lowered state, or the right wheel (3a) can be fixed in a lowered state.

In the above configuration, as shown in Figure 1.2.8, the mission case (1) is located at the front of the aircraft, and is offset to the left in Figure 2 from the left-right center (A) of the aircraft. It is arranged as follows. A second hydraulic cylinder (24) is arranged in parallel to the mission case (1) at a position opposite to the mission case (1) from the left-right center (A) of the fuselage.

Next, the first and second hydraulic cylinders (18), (24
) for supplying and discharging hydraulic oil to the first and second control valves (14
), (15) and the linkage structure with the center float (9) will be explained. As shown in Figure 1.2.3, a support bracket (16) is fixed to the front upper surface of the center float (9).
) is fixed to the operating arm (17).

At the bottom of the front of the mission case (1) is the horizontal axis (P,).
A rod (19) that can only swing up and down is connected to the elongated hole (16a) of the support bracket' (16) and the operating arm (1).
7) is inserted across the first elongated hole (17a).

Further, a rod (25) fixed to the front surface of the mission case (1) is inserted into the first elongated hole (17a) of the operating arm (17). This allows the center float (9) to roll by the amount of the gap created between the left and right width of the first elongated hole (17a) and the rod (25).

On the other hand, in the upper part of the mission case (1), the first and second Two control valves (14) and (15) are provided. In the first control valve (14), the operating shaft (
14a) protrudes in the lateral direction of the aircraft, and this operating shaft (14a)
An L-shaped operating section (26) is fixed to.

The swing arm (27) is swingable about a horizontal axis (P6) different from the operating shaft (14a) of the first control valve (14).
) is attached, and the left and right center portions of the supporting bracket (16) of the center float (9) and the swing arm (2
A connecting rod (28) bent into an L-shape is connected to the connecting rod (28) over one end of the connecting rod (7). Also, the first control valve (
The operating portion (26) of the operating portion (14) is biased counterclockwise in FIG. 3 by the spring (29), and the operating portion (26) of the operating portion (
The bottle (26a) of 26) is in contact with one end of the swing arm (27) from below.

With the above structure, when the aircraft moves up and down with respect to the center float (9) that follows the ground contact on the rice field, the connecting rod (2
8) and the first control valve (14) by the swing arm (27).
When the operation part (26) is operated, the left and right wheels (3a) and (3b) are driven to swing up and down by the first hydraulic cylinder (18) so that the machine body maintains the set height above the rice field. It is.

As will be described later, a main clutch (30) (see Fig. 5) is installed inside the mission case (1), and a clutch arm (31) for important operations is attached to the main clutch (30).
) and the clutch lever (32) of the control handle (6) shown in FIG. 8, the wire (33), as shown in FIG.
It is interlocked and connected via a restraining member (34) and a link (35) which are swingable around the horizontal axis (P,).

Then, when the clutch lever (32) is operated and fixed in the clutch disengaged position, the check member (34) is moved to the wire (33).
) is fixed in the position shown in FIG. When the main clutch (30) is disengaged in this manner, the aircraft body falls forward and the grounded center float (9) is pushed upward. In this case, the swing arm (27
) is the restraining member (34).
The swing arm (27) and the first control valve (14) are stopped at the neutral stop position by contacting the arm (34a).

Further, an L-shaped operating arm (53) shown in FIG. 3 is linked to an operating lever (not shown) via a wire (66). That is, by operating the operating lever, the first control valve (14) can be forcibly operated to the lowering side of the wheels (3a) and (3b) via the operating section (26) by the operating arm (53).

As shown in Figures 2 and 3, the mission case (1
) A bell crank (39) is swingably attached around the front horizontal axis (P8), and the bin (39a) of this bell crank (39) is connected to the second elongated hole (17) of the operating arm (17).
b) is involved. The operating portion (15a) of the second control valve (15) and the bell crank (39) are interlocked and connected via a linking rod (40).

With the above structure, when the aircraft tilts to the left or right with respect to the center float (9) that follows the ground contact on the rice field, the operating arm (17), bell crank (39) and linking rod (40
), the second control valve (15) is operated via the second hydraulic cylinder (24
), the left and right wheels (3a) and (3b) are driven to swing in a contradictory manner.

Next, the structure inside the mission case (1) will be explained. As shown in FIGS. 5 and 6, power from the gasoline engine (12) is transmitted to the input converter (36) of the mission case (1) via a transmission belt (not shown), and the input gear ( 37). This input gear (37) is externally fitted on the first transmission shaft (3rd) so as to be relatively rotatable, and the shift gear (41) is slidably externally fitted on the first transmission shaft (38) with a spline structure. , by engaging and separating the input gear (37), the main clutch (30
). The shift gear (41) is then slid by the clutch arm (31) shown in FIGS. 2 and 3.

From the side opposite to the side where the mission case (1) is deviated from the left and right center (A) of the aircraft (the left side in Fig. 5), the first power transmission shaft (38) and the second power transmission shaft (42) are connected. are protruding, and the first and second transmission shafts (38) and (42)
A first gear (43) and a second gear (44) are attached to the protruding end of the gear. The power of the second transmission shaft (42) is transmitted to the planting arm (4) and the seedling stand (5) via the shift gear (45), the third transmission shaft (46), and the fourth transmission shaft (47).
etc. will be transmitted.

A shift gear (49) is slidably fitted onto the fifth transmission shaft (48) with a spline structure.

This allows the shift gear (49) to be connected to the first transmission shaft (38).
When the shift gear (49) is engaged with the shift gear (41), the power is transferred to the side clutch (51) and the axle (52). and left and right wheels (3a) via a chain (not shown) in the transmission case (2),
(3b). Then, by engaging the shift gear (49) with the fourth gear (54) of the second transmission shaft (42), the wheels (3a), (3
b).

In this case, open the cover (56) and gear the first and second gears (
43) and (44), but the first.
5.8 First and second gears (43) as shown in figure.

(44), the cover (56) is located high above the rice field, and the mission case (1) is located at the center of the left and right sides of the aircraft (
Cover (56
), the transmission case (2), and the wheels (3b) due to the wide spacing between the first and second gears (43).

(44) is easy to replace.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the two-wheel walking type paddy field work machine according to the present invention, and FIG. 1 is a plan view of the vicinity of the transmission case and the first and second hydraulic cylinders, and FIG. 2 is a plan view of the first and second control valves and the center. A front view showing the linkage structure with the float, Figure 3 is the first
and a side view showing the linkage structure between the second control valve and the center float, Fig. 4 is a side view of the vicinity of the swing arm with the main clutch being disengaged, and Fig. 5 is a vertical cross-sectional rear view of the transmission case. , FIG. 6 is a schematic vertical side view of the mission case, FIG. 7 is a plan view of the support arm and the vicinity of the second hydraulic cylinder, and FIG. 8 is an overall side view of the walking rice transplanter. (1)...Mission case, (3a),
(3b)...wheels, (24)...hydraulic cylinders, (A)...center left and right of the aircraft.

Claims (1)

[Claims] Place the traveling mission case (1) at the front of the aircraft, and
A hydraulic cylinder (24) is arranged to be offset to one side laterally from the left and right center (A) of the fuselage, and drives a pair of left and right wheels (3a) and (3b) up and down in a contradictory manner. (A) A two-wheeled walking type paddy field working machine installed in parallel with the mission case (1) so as to be located on the opposite side to the deflection direction of the mission case (1).