JP2566039B2 - Two-wheeled paddy work machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a two-wheel walk type paddy working machine such as a walk type rice transplanter and a walk type direct seeder, more specifically, an engine and a mission case for walking on the front of the machine body. The present invention relates to a two-wheeled paddy working machine in which wheels are supported by a pair of left and right transmission cases that individually extend from the mission case toward the rear of the machine so as to be vertically swingable.

[Conventional technology]

In a walk-behind rice transplanter, which is one of the two-wheel walk type paddy work machines, as disclosed in, for example, Japanese Unexamined Patent Publication No. Hei 1-132308, when one pair of left and right traveling wheels is raised, the other is lowered. As mentioned above, there are some which are provided with a structure that moves up and down in a contradictory manner.

As a result, even if the cultivator on which the wheels run has irregularities,
By moving the left and right wheels up and down in a contradictory manner, the plane is kept parallel to the rice field.

[Problems to be Solved by the Invention]

In the above-mentioned structure, the hydraulic cylinder ((22) in the above publication) for driving the wheels up and down in a contradictory manner is arranged on the lateral side of the mission case for traveling ((2) in the above publication). Therefore, in a walk-behind rice transplanter traveling in a weak paddy field,
As described above, when the hydraulic cylinders are arranged on the row side portions, the balance between the left and right sides of the machine body is likely to be lost, and the machine body may gradually turn to the hydraulic cylinder side even when going straight.

It is an object of the present invention to properly balance the left and right sides of a vehicle body in a two-wheeled walking paddy working machine, and further to favorably balance the front and rear sides.

[Means for solving the problem]

A feature of the present invention is that the two-wheeled walking paddy working machine described at the beginning is configured as follows. That is, the mission case is arranged so as to be laterally offset from the left-right center of the machine body, and a second hydraulic cylinder that drives the pair of left and right wheels up and down in a contradictory manner is installed from the center of the machine body in the left-right direction. The first hydraulic cylinder, which is installed in parallel in the mission case so as to be located on the side opposite to the eccentric direction and vertically drives the pair of left and right wheels in the same direction, is mounted in such a manner that the piston rod faces rearward of the machine body. It is arranged below the engine in front of the mission case. The action and effect are as follows.

[Work]

When the second hydraulic cylinders are arranged side by side on the lateral side of the mission case as in the conventional structure, the center of gravity of the machine body moves from the left-right center of the machine body to the second hydraulic cylinder side.

However, if the mission case is eccentric to the side opposite to the second hydraulic cylinder as in the present invention, the movement of the center of gravity of the machine body by the second hydraulic cylinder is suppressed and the center of gravity of the machine body is positioned in the left and right center of the machine body. It can be set.

In the case of this type of walk-behind work machine, the front side of the machine body is lifted up due to the driving reaction force of the wheels. However, since the first hydraulic cylinder is located in front of the transmission case and below the engine, it serves as a balance weight that applies weight to the front of the machine to prevent or suppress lifting of the cylinder. Moreover, in the first hydraulic cylinder, since the piston rod is in the rearward mounting posture, the cylinder tube side, which is heavier than the piston rod side, is positioned on the front side of the machine body to effectively prevent lifting of the front side of the machine body. To suppress.

This makes it possible to attach the wheels closer to the rear side of the machine or to lengthen the part of the body in front of the wheels while making the weight of the entire machine as light as possible compared to installing a dedicated balance weight or making it heavy. As compared with the above, it is possible to prevent or suppress the lifting of the front side of the machine body while shortening the length of the portion located on the front side of the wheels of the machine body.

Further, when the mission case is deviated from the left-right center of the machine body to one side, the space between the wheels and the wheels on the side opposite to the deviation direction in the mission case becomes wider. Therefore, when arranging the second hydraulic cylinder in this space, it is possible to arrange it with a margin without giving a spatial force to other structures.

〔The invention's effect〕

As described above, the center of gravity of the machine body can be positioned in the left-right center of the machine body even if the second hydraulic cylinder for driving the wheels in the opposite direction is provided, and the machine body is gradually oriented when going straight. By reducing the number of changes, further, by using the first hydraulic cylinder as a balance weight, it is possible to prevent or suppress lifting of the front of the machine while keeping the machine as light and short as possible, The two-wheeled type allows for easy operation so that running stability is improved.

Further, since the second hydraulic cylinder can be arranged without difficulty, there is no need to say that this second hydraulic cylinder gives a spatial impediment to other structures and causes a failure.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 8, a pair of transmission cases (2) on both left and right sides of the traveling mission case (1) swing up and down around the horizontal axis (P ₁ ) while extending rearward of the machine body. The vehicle body is supported by being freely supported, and traveling wheels (3a), (3b) are provided at the respective ends of the transmission case (2). The rear part of the machine is equipped with a seedling planting device (4), a seedling stand (5) and the like, and a steering handle (6), and a mission case (1) and a planting arm (4). ) Is provided with a tank (7) and a feeding device (8) for feeding the fertilizer in the tank (7).

A center float (9) is attached to a lower portion of the machine body so as to be vertically swingable around a horizontal axis core (P ₂ ) at a rear part of the machine body and to be freely flooring around a front and rear axis center (P ₃ ).
A grooving device (10) for making a groove on the rice field is fixed to this center flow (9), and the fertilizer fed from the feeding device (8) passes through the hose (11) and the grooving device (10). It is sent into the groove made by. As described above, the walk type rice transplanter, which is an example of the two-wheel walk type paddy work machine, is configured.

As shown in FIG. 8, a forward descending frame (13) is fixed to the front of the mission case (1), and a gasoline engine (12) is mounted on the frame (13). Is supported in a forward descending posture.

Next, the vertical drive structure of the left and right wheels (3a) and (3b) will be described. As shown in FIGS. 1, 7, and 8, a rear end of a single-acting first hydraulic cylinder (18) is connected to a front end in the frame (13), and the first hydraulic cylinder (18) is Is turned. The support arm (20) is fixed to the tip of the piston rod (18a) of the first hydraulic cylinder (18), and a pair of upper and lower balance arms (around the vertical axis (P ₄ ) of the support arm (20) ( 21) is swingably attached. The balance arm (21) projects outward from the left and right elongated holes (13a) of the frame (13), and both ends of the balance arm (21) and the transmission case (2) serve as the base arm (2a). A pair of left and right rods (22) are installed and connected to each other. With the above structure, when the first hydraulic cylinder (18) is extended or contracted, the left and right transmission cases (2) and the wheels (3a) and (3b) are vertically rocked in the same direction.

Then, as shown in FIGS. 1 and 7, the double-acting second hydraulic cylinder (24) extends over the support arm (20) and the bracket (23) fixed to the left rod (22). It is erected and connected. With this structure, for example, when the second hydraulic cylinder (24) is extended, the left transmission case (2) and the wheels (3b) are driven to swing downward. Then, in conjunction with this operation, the arm (2
1) is swung counterclockwise in FIG. 1, and the right transmission case and the wheel (3a) are swung upward.
That is, it is possible to reciprocally drive the left and right transmission cases (2) and the wheels (3a), (3b) upside down by expanding and contracting the second hydraulic cylinder (24).

Further, as shown in FIGS. 1 and 7, a lock member (64) which is swingable is attached around the vertical axis (P ₉ ) of the lower balance arm (21). In the state shown in FIG. 7, the left and right wheels (3a), (3
This is a state in which the reciprocal vertical drive of b) can be performed. And
By swinging the lock member (64) with the wire (65),
By engaging the pin (20a) of the support arm (20) with the first recess (64a) of the lock member (64), the left and right wheels (3
It is possible to fix a) and (3b) in a posture parallel to the airframe. In addition, the pin (20a) is connected to the second recess (64) of the locking agent (64).
By engaging b) or the third recess (64c), it is possible to fix the left wheel (3b) in the lowered state or the right wheel (3a) in the lowered state.

In the above configuration, as shown in FIGS. 1, 2, and 8, the engine (12) and the mission case (1) are located in the front part of the fuselage, and the mission case (1) is located in the left-right center (A) of the fuselage. In FIG. 2, it is displaced to the left of the paper surface. The second hydraulic cylinder (24) is arranged in parallel with the mission case (1) so as to be located on the side opposite to the mission case (1) with respect to the left-right center (A) of the airframe. The first hydraulic cylinder (18) has a piston rod (18a) facing rearward of the machine body and is mounted in such a mounting direction as to interlock with a pair of left and right transmission cases (2) and (2). It is located below (12).

Next, the first and second control valves (14), (1) for supplying and discharging hydraulic oil to the first and second hydraulic cylinders (18), (24)
5) and the center float (9) linkage structure will be described. As shown in FIGS. 1, 2, and 3, a support bracket (16) is fixed to the front upper surface of the center float (9), and an operation arm (17) is fixed to the support bracket (16). The lower part of the front of the mission case (1) has a rod (19) that can only swing vertically around the horizontal axis (P ₅ ).
Is inserted over the long hole (16a) of the support bracket (16) and the first long hole (17a) of the operation arm (17).

Further, a rod (25) fixed to the front surface of the transmission case (1) is inserted into the first long hole (17a) of the operation arm (17). As a result, the center float (9) can be rolled by the amount of the gap between the horizontal 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 mission case (1) is on the left side of the paper (see FIG. 2).
The first and second control valves (14), (15) are provided on the side opposite to the side that is biased. First control valve (1
In 4), an operating shaft (14a) of a spool (not shown) projects in the lateral direction of the machine body, and an L-shaped operating portion (26) is fixed to the operating shaft (14a).

Then, the first control valve operating shaft of (14) (14a) different horizontal axis (P ₆₎ pivotally swing arm around the (27) is attached, a center support bracket of the float (9) A linking rod (28) bent in an L-shape across the left and right central portions of (16) and one end of the swing arm (27).
Are erected and connected. Further, the operating portion (26) of the first control valve (14) is biased counterclockwise in FIG. 3 by the spring (29), and the pin (26a) of the operating portion (26) is
Is in contact with one end of the swing arm (27) from below.

With the above structure, when the body moves up and down with respect to the center float (9) that follows the ground contact with the paddy field, the operating rod (28) and the swing arm (27) cause the operating portion (26) of the first control valve (14). Is operated, and the left and right wheels (3a) and (3b) are swingably driven up and down by the first hydraulic cylinder (18) so that the airframe maintains the set height above the rice field.

As will be described later, a main clutch (30) (see FIG. 5) is internally provided in the mission case (1), and a clutch arm (31) for turning on / off the main clutch (30) and FIG. Clutch lever (32) of the steering handle (6) shown in
And the wire (33) and the horizontal axis (P ₇ ) as shown in Fig. 3.
A restraining member (34) and a link (35) that can swing freely
Are interlockingly connected via.

When the clutch lever (32) is operated and fixed to the clutch disengaged position, the traction member (34) is fixed at the position shown in FIG. 4 by the pulling action of the wire (33). When the main clutch (30) is disengaged in this manner, the machine body falls forward and is lifted above the grounded center float (9). In this case, the pin (27a) provided on the swing arm (27) is connected to the arm (34) of the restraint member (34).
a), contact the swing arm (27) and the first control valve (1
4) is stopped at the neutral stop position.

An L-shaped operation arm (53) shown in FIG. 3 is linked to an operation lever (not shown) via a wire (66).
That is, by operating the operation lever, the first control valve (1) is operated by the operation arm (53) through the operation section (26).
4) The wheel (3a) and (3b) can be forcibly operated to descend.

As shown in FIGS. 2 and 3, a bell crank (39) is swingably attached around a horizontal axis (P ₈ ) on the front of the mission case (1), and a pin ( 39a) is engaged with the second elongated hole (17b) of the operation arm (17). Then, the operating portion (15) of the second control valve (15)
a) and the bell crank (39) are interlockingly connected to each other via a linking rod (40).

With the above structure, when the aircraft leans to the left or right with respect to the center float (9) that follows the ground contact with the paddy field, the second control valve (via the operation arm (17), the bell crank (39) and the linking rod (40) ( The left and right wheels (3a), (3b) are oscillatingly driven by the second hydraulic cylinder (24) so that the vehicle body is operated in parallel with the left and right sides of the rice field by operating 15).

Next, the structure inside the mission case (1) will be described. As shown in FIGS. 5 and 6, the power from the gasoline engine (12) is transmitted to the input pulley (36) of the transmission case (1) via a transmission belt (not shown), and the input gear ( 37). The input gear (37) is externally fitted to the first transmission shaft (38) so as to be relatively rotatable. A shift gear (41) slidably fitted to the first transmission shaft (38) in a spline structure is provided. Input gear (37)
The main clutch (30) is formed by engaging and disengaging the main clutch. Then, the shift gear (41) is slid by the clutch arm (31) shown in FIG. 2 and FIG.

The side opposite to the side where the mission case (1) is deviated from the left and right center (A) of the fuselage (left side in FIG. 5)
, A first transmission shaft (38) and a second transmission shaft (42) protrude, and a first gear (43) and a second gear (43) are protruded from protruding ends of the first and second transmission shafts (38), (42). Gear (44) is attached.
Then, the power of the second transmission shaft (42) is transferred to the shift gear (45),
It is transmitted to the Uemura arm (4), the seedling stand (5) and the like via the third transmission shaft (46) and the fourth transmission shaft (47).

A shift gear (49) is slidably fitted to the fifth transmission shaft (48) in a spline structure. As a result, the shift gear (49) is engaged with the third gear (50) of the first transmission shaft (38) so that the shift gear (49) is engaged with the shift gear (41) in the forward first speed state. In the high speed state, the power is the side clutch (51), the axle (52) and the chain (not shown) in the transmission case (2).
And transmitted to the left and right wheels (3a) and (3b). Then, by engaging the shift gear (49) with the fourth gear (54) of the second transmission shaft (42), the power is transmitted to the wheels (3a), (3b) in a reverse drive state.

In this case, the cover (56) is opened to exchange the first and second gears (43) and (44).
As shown in the figure, the first and second gears (43) and (44) and the cover (56) are at a high position from the rice field, and the transmission case (1) is located at one side from the left and right center (A) of the fuselage. The cover (56) and the transmission case (2)
The first and second gears (43) and (44) can be easily exchanged because the distance between the first gear and the wheel (3b) is large.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a two-wheeled paddy field working machine according to the present invention. Fig. 1 is a plan view of the vicinity of a mission case, first and second hydraulic cylinders, and Fig. 2 is a first and second control valve and a center. The front view showing the linkage structure with the float, FIG.
FIG. 4 is a side view showing the structure for linking the second control valve and the center float, FIG. 4 is a side view near the swing arm when the main clutch is disengaged, and FIG. FIG. 6 is a schematic vertical side view of the mission case, FIG. 7 is a plan view of the vicinity of the support arm and the second hydraulic cylinder, and FIG. 8 is an overall side view of the walk type rice transplanter. (1) ... mission case, (2) ... transmission case,
(3a), (3b) …… Wheels, (12) …… Engine, (18)
...... First hydraulic cylinder, (18a) ...... Piston rod,
(24) …… Second hydraulic cylinder, (A) …… Center of left and right of the machine.

Claims (1)

(57) [Claims] 1. A pair of left and right, wherein an engine (12) and a mission case (1) for traveling are arranged at the front of the machine body, and individually extend from the mission case (1) rearward of the machine body so as to be vertically swingable. A two-wheeled paddy working machine in which wheels (3a) and (3b) are supported by transmission cases (2) and (2), respectively. A second hydraulic cylinder (24), which is arranged eccentrically to one side and vertically drives the pair of left and right wheels (3a) and (3b) in a contradictory manner, is provided from the center (A) of the left and right of the airframe to the mission. A first hydraulic cylinder that is arranged in parallel with the mission case (1) so as to be located on the side opposite to the direction of deviation of the case (1) and vertically drives the pair of left and right wheels (3a), (3b) in the same direction. (18) to the piston rod (18
A two-wheeled paddy work machine arranged below the engine (12) in front of the mission case (1) in a mounting direction in which a) faces rearward of the machine body.