JPH088808B2 - Walk-type paddy work machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to the overall structure of a walk-type paddy working machine such as a walk-type rice transplanter and a walk-type direct seeder.

[Conventional technology]

In a walk-type rice transplanter, which is one of the walk-type paddy working machines, for example, as disclosed in Japanese Examined Patent Publication No. Sho 58-22163, up and down swings around the horizontal axis of the left and right mission cases provided in the front of the fuselage. A pair of left and right transmission cases (members (21) in the above publication) are movably supported, the transmission cases extend to the rear of the machine body, and wheels for traveling (members (2) in the publication) are provided at the extended ends of the transmission cases. There is a structure with.

Then, a first hydraulic cylinder (member (4) in the above publication) is arranged from the rear surface of the mission case toward the rear of the machine body, and a balance is provided around the longitudinal axis around the tip of the piston rod (member (41) in the above publication). Arm (member (42) of the above publication)
And a pair of linking rods extending from the base of the transmission case upward (the member (44) in the above publication) and the left and right ends of the balance arm (the member (43 in the above publication). )) Is installed. With the above structure, the left and right wheels can be vertically swung in the same direction by expanding and contracting the first hydraulic cylinder. Then, such an operation is performed when the height of the aircraft with respect to the rice field is corrected.

Further, the second hydraulic cylinder (the member (6) of the above-mentioned publication is installed over the piston rod of the first hydraulic cylinder and the balance arm. By this, the second hydraulic cylinder is expanded and contracted to move the balance arm to the first arm. By swinging the piston rod of the hydraulic cylinder 1, the left and right wheels can be swung up and down in opposite directions, and such an operation generally corrects the left and right inclination of the body to To return parallel to the rice field.

[Problems to be Solved by the Invention]

In general, a walk-behind rice transplanter has a rear part of the body relatively heavy because a rear part of the body is equipped with a seedling planting device composed of a planting arm, a seedling stand, and a steering handle. Then, in combination with the propulsive reaction force from the wheels when moving forward, the aircraft tends to descend backward, and the seedlings are deeply planted as a whole.

Therefore, as described above, the first hydraulic cylinder, the second hydraulic cylinder, the balance arm, the linking rod, and the like for the wheel vertical swing operation are located on the rear side of the mission case with respect to such a backward descending aircraft body. Then, the weight of these causes the aircraft to descend further backward. As a result, the seedlings will be planted deeper, and if the cultivator has large irregularities, it will be difficult to control.

An object of the present invention is to improve the weight balance of the entire machine body while providing a vertical swing operation structure for the left and right wheels in the same direction and in the opposite direction.

[Means for solving the problem]

A feature of the present invention is that the walk-behind paddy work machine is configured as follows. In other words, a pair of left and right transmission cases, which are vertically swingably supported around the horizontal axis of the left and right sides of the mission case, are supported by a frame attached to the front of the mission case at the front of the fuselage. The transmission case extends rearward, and a traveling wheel is provided at the extended end of the transmission case. The first hydraulic cylinder is provided in the frame so as to be inclined forward and downward along the engine, and the piston rod is directed rearward of the machine body. And attach a balance arm swingable around the longitudinal axis to the tip of the piston rod,
The left and right ends of the balance arm are projected outward from the longitudinal holes in the body front-rear direction provided on the left and right lateral sides of the frame,
A pair of linking rods are installed across the arm extending upward from the base of the transmission case and the left and right ends of the balance arm, and the piston rod of the first hydraulic cylinder and one arm of the transmission case or this A second hydraulic cylinder is installed so as to extend over a member connected to the arm so that the left and right wheels can be vertically swung in the same direction by the expansion and contraction operation of the first hydraulic cylinder. The left and right wheels are configured to swing up and down in opposite directions by the expansion and contraction operation of (1), and the operation and effect are as follows.

[Action]

As described above, if the first hydraulic cylinder for wheel vertical swing operation, the second hydraulic cylinder, the balance arm, the linking rod, etc. are arranged on the front side of the mission case, the center of gravity of the entire machine body moves to the machine body front side. The weight of various devices located on the rear side of the mission case (a seedling planting device, a direct seeding device, a steering wheel, etc.) and the tendency of the aircraft to descend backward due to the propulsive reaction force from the wheels during forward movement are suppressed.

When the engine, which is a heavy object, is supported in the forward downward inclination state, the center of gravity of the engine moves to the front side of the machine body and also to the lower side of the machine body as compared with the parallel support state. As a result, the center of gravity of the entire machine body moves further to the front side of the machine body, so that the backward descent tendency of the machine body is further suppressed.

Further, since the first hydraulic cylinder is arranged in the lower frame of the engine in the front downward inclination state, the positions of the first hydraulic cylinder, the balance arm, the linking rod, and the second hydraulic cylinder are also lowered. Therefore, by lowering the position of the first hydraulic cylinder and the like and lowering the center of gravity of the engine, the center of gravity of the entire machine body can be lowered.

〔The invention's effect〕

As described above, the center of gravity of the entire machine can be moved to the front side of the machine rather than the conventional structure, and the backward descent tendency of the machine can be suppressed, and problems with the conventional structure (such as deep planting of seedlings and deeper direct seeding positions) can be reduced. We were able to.

The center of gravity of the entire machine can be lowered, and the movement of the center of gravity of the machine to the front side of the machine makes it possible to perform stable work running that is difficult to tilt back and forth and left and right even with uneven cultivator, and is a walkable paddy field work. We were able to improve the running performance of the aircraft.

〔Example〕

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

As shown in FIG. 3, a pair of transmission cases (2) are supported on the left and right sides of the traveling mission case (1) so as to be vertically swingable around the horizontal axis (P ₁ ), and the transmission is performed. A case (2) is extended to the rear of the machine body, and traveling wheels (3a) and (3b) are provided at the extended ends to support the machine body. The rear part of the machine is equipped with a seedling planting device (4), a seedling stand (5), and a steering handle (6), and a mission case (1).
Between the planting arm and the planting arm (4), a tank (7) and a feeding device (8) for feeding the fertilizer in the tank (7) are provided.

Further, a center float (9) is attached to the lower part of the machine body so as to be vertically swingable around a horizontal axis (P ₂ ) at the rear of the machine and also to be freely rolled around a front-rear axis (P ₃ ). The center float (9) is fixed with a grooving device (10) that makes a groove on the rice field (G), and the fertilizer fed from the feeding device (8) passes through the hose (11). It is sent into the groove made by (10). As described above, the walk type rice transplanter, which is an example of the walk type paddy working machine, is configured.

This walk-behind rice transplanter is equipped with a gasoline engine (12). Next, the support structure of this gasoline engine (12) will be described. As shown in FIG. 3, a front downward frame (13) is fixed to the front of the mission case (1),
A gasoline engine (12) is mounted on the frame (13), and the gasoline engine (12) is supported in a forward descending leaning posture. Then, the power from the gasoline engine (12) is transmitted to the transmission case (1) through the transmission belt (34) and the gear is changed, and the power is transmitted through a transmission chain (not shown) in the left and right transmission cases (2). Is transmitted to the left and right wheels (3a), (3b).

A carburetor (14) for the gasoline engine (12) is attached to the front of the gasoline engine (12), and a fuel tank (15) is arranged above the mission case (1). This fuel tank (15) is a stay (29) extended from the back of the gasoline engine (12).
The front portion of the fuel tank (15) is bolted to the head cover (30) of the gasoline engine (12) and is supported in a slightly frontward descending posture.

The fuel tank (15) and the vaporizer (14) are connected by a fuel pipe (16) equipped with a filter (31). And the carburetor (14), gasoline engine (12),
The fuel tank (15), the feeding device (8), etc. are covered with the bonnet (17).

Next, the vertical movement structure of the left and right wheels (3a), (3b) will be described. As shown in FIGS. 2 and 3, the rear end of the single-acting first hydraulic cylinder (18) is connected to the front end of the frame (13), and the first hydraulic cylinder (18) is connected to the gasoline engine ( It is supported in a forward-downward leaning posture along 12) and facing the rear of the fuselage. A fulcrum member (20) is externally fitted to the tip of the piston rod (18a) of the first hydraulic cylinder (18) via a suspension spring (19), and the vertical axis of the fulcrum member (20) ( A pair of upper and lower balance arms (21) are swingably attached around P ₄ ).

On the other hand, the left and right lateral sides (13b) of the frame (13)
A slotted hole (13a) is formed in the front and rear direction of the fuselage in a forward and downward direction. From this slot (13a), the balance arm (21)
Both left and right ends of the are protruding outward. A pair of left and right linking rods (22) are erected and connected across both ends of the balance arm (21) and the arm (2a) extending upward from the base of the transmission case (2). With the above structure, when the piston rod (18a) of the first hydraulic cylinder (18) is extended rightward in the drawing, the left and right transmission cases (2) and the wheels (3a) and (3b) are simultaneously swung downward. Is done. On the contrary, when the piston rod (18a) of the first hydraulic cylinder (18) is contracted to the left in the drawing, the left and right transmission cases (2) and the wheels (3a) and (3b) are simultaneously rocked upward. Of.

Then, as shown in FIG. 2, the second double-acting type spans the arm (20a) fixed to the fulcrum member (20) and the bracket (23) fixed to the left linking rod (22). A hydraulic cylinder (24) is erected and connected. This structure allows
For example, if the second hydraulic cylinder (24) is extended, the left transmission case (2) and the wheel (3b) are oscillated downward. In conjunction with this operation, the balance arm (21) is oscillated counterclockwise in FIG. 2 via the left connecting rod (22), and the right transmission case (2) and wheel (3a) are moved. It is rocked upward. That is, the left and right transmission cases (2) and the wheels (3a), (3b) can be vertically swung in the opposite directions by expanding and contracting the second hydraulic cylinder (24).

Next, the linkage between the center float (9) and the first and second hydraulic cylinders (18), (24) will be described. First
As shown in the figure, the center float (9) is in contact with the front upper surface of the center rod (9) in a state of being urged to the lower side of the link rod (25), and the upper end of the link rod (25) is the first hydraulic cylinder. It is connected to a first control valve (26) for supplying and discharging hydraulic oil to (18).

As a result, when the aircraft moves up and down with respect to the center float (9) that follows the ground contact with the field (G), the first control valve (26) is operated via the linkage rod (25), and the aircraft is moved to the field (G). The left and right wheels (3a), (3b) are automatically vertically swung in the same direction by the first hydraulic cylinder (18) so that the set height is maintained.

The operation arm (27) is vertically fixed to the front part of the center float (9), and the pin (28a) at the lower end of the bell crank (28) on the aircraft side is provided with a long hole ( 27a). Further, a link rod (33) is provided so as to span the second control valve (32) for supplying and discharging hydraulic oil to the second hydraulic cylinder (24) and the bell crank (28).

As a result, when the aircraft leans to the left or right with respect to the center float (9) that follows the ground contact with the rice field (G), the second control valve passes through the operation arm (27), the bell crank (28), and the linking rod (33). When the (32) is operated, the left and right wheels (3a), (3b) are automatically vertically swung in the opposite direction by the second hydraulic cylinder (24) so that the aircraft becomes parallel to the field (G). It is.

In the above-described embodiment, when the second hydraulic cylinder (24) is attached, the second hydraulic cylinder (24) is connected to the linkage rod (22) via the bracket (23). The left transmission case (2) arm (2a)
May be directly connected to. In addition, another arm (not shown) is extended from the vicinity of this arm (2a), and a second arm is attached to this arm.
The hydraulic cylinder (24) may be connected.

INDUSTRIAL APPLICABILITY The present invention can be applied not only to a walk-type rice transplanter, but also to a walk-type direct seeder equipped with a direct seeding device for dropping seed paddy into the groove while digging a groove on the rice field (G) at the rear of the machine body.

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 the walking paddy working machine according to the present invention,
FIG. 1 is a perspective view showing a linked state of the center float and the first and second control valves, FIG. 2 is a perspective view showing a vertically swinging structure of left and right wheels, and FIG. 3 is an entire walk-behind rice transplanter. It is a side view. (1) ... mission case, (2) ... transmission case,
(3a), (3b) …… Wheels, (12) …… Engine, (13)
…… Frame, (13b) …… Horizontal side of frame, (13a)
…… Oval holes on the lateral side of the frame, (18) …… first hydraulic cylinder, (18a) …… piston rod of the first hydraulic cylinder, (21) …… balance arm, (22) …… linking rod,
(24) …… Second hydraulic cylinder, (P ₁ ) …… Transmission case horizontal axis center, (P ₄ ) …… First hydraulic cylinder piston rod tip vertical axis center.

Claims (1)

[Claims] 1. An engine (12) is supported by a frame (13) mounted on the front of a mission case (1) at the front of the fuselage in a front-down tilted posture, and the left and right horizontal axis cores (P) of the mission case (1) are supported. ₁ ) Extend a pair of left and right transmission cases (2) that are swingably supported up and down around the rear of the machine, and set wheels (3a) and (3b) for traveling at the extended ends of the transmission cases (2). In addition, the first hydraulic cylinder (18) is arranged in the frame (13) along the engine (12) so as to be inclined forward and downward, and the piston rod (18a) is directed rearward of the machine body. Vertical axis (P ₄ ) at the tip of the rod (18a)
Attach a balance arm (21) that can swing freely, and attach the balance arm (21) to both left and right ends through elongated holes (13a) in the machine front-rear direction provided on the left and right lateral sides (13b) of the frame (13). The arm (2a) protruding outwardly from the base of the transmission case (2) and the balance arm (2).
1) A pair of linking rods (22) are laid across both left and right ends of the first hydraulic cylinder (18), and a piston rod (18a) of the first hydraulic cylinder (18) and one arm (2a) of the transmission case (2).
Alternatively, the second hydraulic cylinder (24) is installed so as to span the arm (2a) and a member that is connected to the first hydraulic cylinder (18).
The left and right wheels (3a), (3b) are vertically swung in the same direction by the expansion and contraction operation of the right and left wheels (3a), (3b) by the expansion and contraction operation of the second hydraulic cylinder (24). ) Is a walking type paddy work machine configured to be vertically rocked in opposite directions.