JPH048209A - Walking-type working machine in paddy field - Google Patents

Abstract

PURPOSE:To prevent oil leakage in a control valve and reduction of durability by inhibiting downward displacement of wheels in stopping a shaking arm at a position corresponding to a neutral position of the control valve with 'off' operation of a main clutch. CONSTITUTION:A main clutch is subjected to 'off' operation and an shaking arm 27 is stopped at a position corresponding to a neutral stopping position by a restraining part 34. In said case, even a connecting rod 28 is upwardly pushed up by forwardly falling a machine body, the pushing-up force is not applied to an operation shaft 14a of a control valve 14, but applied to a supporting point (corresponding to a horizontal shaft core P6) of the shaking arm 27 and the restraining part material 34. Thereby, oil leakage in the control valve and reduction of durability are prevented.

Description

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

[Conventional technology]

In a walk-behind direct seeding machine, which is one of the walk-behind paddy field working machines, as disclosed in Japanese Patent Laid-Open No. 60-176511, the running wheels are driven up and down to raise the machine to a set height above the rice field. Some devices are configured to maintain

In this structure, the traveling wheels are driven up and down by hydraulic cylinders, and a rotary control valve is provided for operating the hydraulic cylinders. As shown in Figure 2 of the above publication, the control valve spool's operating shaft (
(lla) of the above-mentioned publication and the swinging arm ((1a) of the above-mentioned publication)
2)) is attached so as to be freely swingable, and a linking rond ((15) in the above publication) is constructed across the center float ((6) in the above publication) and the swing arm. and,
The operating part fixed to the operating shaft of the control valve ((13) of the above publication)
) is provided with a bottle ((13a) in the above-mentioned publication), and one end of the swinging arm is abutted against this pin from above.

As a result, when the aircraft moves up and down with respect to the center float that follows the ground contact with the rice field, the operating shaft of the control valve is rotated by the linked rond and the swing arm, so that the aircraft is maintained at the set height above the rice field. The wheels are driven up and down.

[Problem to be solved by the invention]

Walking type rice transplanters tend to fall backwards due to the reaction force from the wheels when planting rice in rice fields, so to prevent this, the center of gravity of the machine is set to the front of the wheels. Therefore, if the main clutch is disengaged and stopped while traveling on the road, the aircraft will fall forward and the front part of the center float will hit the ground, causing the linkage rond (15) in the above-mentioned publication to be pushed up from below and the control valve to be operated. This causes the wheels to move up and down.

As a means to prevent such a situation, in the disclosed structure described above, the main clutch is disengaged (in FIG. 2 of the above publication, the wire (27) is pulled upward to release the clutch lever).
(28)), the swinging arm ((1) of the above publication) is activated.
2) One end of ) is configured to be stopped at a neutral stop position by a stopper ((29) of the above-mentioned publication).

Therefore, when stopped as described above, as shown in FIG. 2 of the publication, the right end of the swinging arm in the paper is stopped by the stopper, and the left end of the swinging arm in the paper is pushed upward by the linking iron. As a result, when the swing arm is attached to the operating shaft of the control valve as in the disclosed structure, the operating shaft of the control valve is subjected to a bending action by the swing arm.

Therefore, distortion occurs in the spool of the control valve, leading to oil leakage within the control valve and reduced durability.

An object of the present invention is to eliminate the above-mentioned problem that occurs when the aircraft body falls forward when the main clutch is disengaged.

[Means to solve the problem]

The feature of the present invention is that the walking type paddy field work machine as described above is configured as follows.

In other words, a center float extending to the front of the fuselage is attached to the lower part of the fuselage so as to be able to move up and down, and a linked rond is connected between one end of a swinging arm that can freely swing around the horizontal axis above the center float and the center float. erected, and a rotary control valve for driving the travel wheels up and down is arranged so that its operating axis is parallel to the horizontal axis and at a different position from the horizontal axis. The operating part of the operating shaft and the other end of the swing arm are linked to operate the control valve based on the vertical movement of the aircraft with respect to the center float that follows the ground contact with the rice field, and the aircraft is raised to a set height from the rice field. The structure is configured such that the wheels are driven up and down so that the wheels are maintained at the same position, and when the main clutch is disengaged, the swinging arm is received at a position corresponding to the neutral stop position of the control valve, and the wheels are moved in the downward direction. A check member is provided that is operated to switch between a state where displacement is prevented and a state where the swing arm is allowed to swing over the operating range of the control valve in conjunction with the engagement operation of the main clutch, Its action and effects are as follows.

[For production]

With the configuration described above, when the aircraft moves up and down with respect to the center float (9) as shown in FIG.
P6), and the operating shaft (14a) of the control valve (14) is rotated via the operating portion (26).

Then, when the main clutch is disengaged and operated, the check member (34)
moves the swinging arm (27) to a position W(
Stop at the state shown in Figure 2). In this case, even if the aircraft falls forward and the linked rondo (28) is pushed upwards in the drawing, this pushing up force is applied to the support point of the swing arm (27) (corresponding to the horizontal axis (P6)) and the restraining member. (34) and not the operating shaft (14a) of the control valve (14).

〔Effect of the invention〕

As described above, even if the aircraft falls forward and the center float is pushed up, the structure can be configured so that the force is not applied to the control valve's operating shaft, thereby preventing oil leakage within the control valve and reducing durability. This can now be prevented.

〔Example〕

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

As shown in Figure 5, the transmission case for driving (1)
A pair of transmission cases (2) are located on both the left and right sides of the horizontal axis (Pl
), and this transmission case (2
) has running wheels (3a) 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/S handle (6), and a seedling case (1) and a seedling stand (5). A tank (7) and a feeding device (8) for feeding out the fertilizer in the tank (7) are provided between the arm (4) and 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 walking rice paddy working machine, is constructed.

As shown in FIG. 5, 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 downward tilting position.

Next, the vertical drive structure of the left and right wheels (3a) and (3b) will be explained. As shown in Figure 4.5.8, 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 this first hydraulic cylinder (1st), and this support arm (20)
) 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 ronds (22) are constructed and connected across 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 the wheels (3aL (
3b) are driven to swing up and down in the same direction.

Then, as shown in FIGS. 4 and 8, the support arm (2
0) and the bracket I- fixed to the left bolt (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. 4 via the rond (22), and the right operating case (2) and wheel (3a) are swung upward. dynamically driven. In other words, the second hydraulic cylinder (2
By the telescopic operation of 4), the left and right transmission cases (2) and wheels (3a) and (3b) can be driven vertically in a contradictory manner.

Further, as shown in FIGS. 4 and 8, a locking member (64) is attached around the vertical axis (P6) of the lower balance arm (21) so as to be swingable. In the state shown in FIG. 8, 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).
by swinging the pin (20a) of the support arm (20).
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, pin (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 Figures 4 and 5, the mission case (1) is located at the front of the aircraft, and is offset to the left in Figure 3 from the left-right center (^) of the aircraft. It is arranged as follows. Then, place it on the opposite side of the mission case (1) from the left and right center (A) of the aircraft
The hydraulic cylinders (24) are arranged in parallel to the transmission case (1).

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 1.3.4, a support bracket (16) is fixed to the front upper surface of the center float (9), and an operating arm (17) is fixed to this support bracket (16).

The horizontal axis (P6) is located at the lower front of the mission case (1).
A port (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 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.

A swing arm (27) is attached to be able to swing freely around a horizontal axis (P6) at a position different from the operating shaft (14a) of the first control valve (14), and a center float (
A linking rod (28) bent into an L-shape is constructed and connected between the left and right center portions of the support bracket (16) of 9) and one end of the swing arm (27). Further, the operating portion (26) of the first control valve (14) is urged counterclockwise in FIG. 1 by the spring (29), and the pin (26a) of the operating portion (26) 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 (1B) 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 Figure 6) 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 of the control handle (6) shown in Figure 5.
(32) are interlocked and connected via a wire (33), a check member (34) swingable around the horizontal axis (P7), and a link (35), as shown in FIG.

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, the L-shaped operating arm (53) shown in FIG. 1 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 1 and 3, the mission case (1
) A hell crank (39) is swingably attached around the front horizontal axis (PB), and the pin (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 the 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. 6 and 7, 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 to the first transmission shaft (38) so as to be relatively rotatable, and the shift gear (41) is slidably externally fitted to the first transmission shaft (38) with a spline structure. By engaging and separating the input gear (37), the main clutch (30
). Then, the shift gear (41) is slid by the clutch arm (31) shown in FIGS. 1 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 (left side in Fig. 6), the first power transmission shaft (38) and the second power transmission shaft (42) are connected. protrudes, and the first and second transmission shafts <38), (42
) A first gear (43) and a second gear (44) are attached to the protruding ends 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.

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 sight 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.
5.6 As shown in Figure 6, the first and second gears (43) (44
), the cover (56) is located high above the rice field, and the mission case (1) is deviated to one side from the left-right center (A) of the aircraft, causing the cover (56) and transmission case (2) to be separated from each other. and the first and second gears (43) due to the wide spacing between them and the wheels (3b).

(44) is easy to replace.

As shown in Figures 9 and 10, the mission case (
1) and the transmission case (67) of the planting arm (4), a reinforcing frame (68) is constructed, and a stay (69) for supporting the feeding device (8) is fixed to this frame (68). has been done. On the other hand, a frame (70) is constructed across both feeding devices (8), and the frame (70
) is placed on the stepped portion (69a) of the stay (69), and the feeding device (8) is bolted to both ends of the stay (69).

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 walking type paddy field work machine according to the present invention,
Figure 1 is a side view showing the linkage structure between the first and second control valves and the center float, Figure 2 is a side view of the vicinity of the swing arm when the main clutch is disengaged, and Figure 3 is a side view showing the linkage structure between the first and second control valves and the center float. 1st
4 is a plan view of the mission case and the vicinity of the first and second hydraulic cylinders. FIG. 5 is an overall side view of the walking rice transplanter. Figure 6 is a vertical rear view of the mission case, Figure 7 is a schematic vertical side view of the mission case, Figure 8 is a plan view of the support arm and the vicinity of the second hydraulic cylinder, and Figure 9 is a support structure for the feeding device and tank. FIG. 10 is a front view showing the support structure of the feeding device and the tank. (3a), (3b)...wheels, (9)・
... Center float, (14) ... Control valve, (14a) ... Control valve operating shaft, (26
)... Operating unit, (27)... Swinging arm, (28)... Linking rod, (30)...
... Main clutch, (34) ... Checking member, (
P6)...Horizontal axis center.

Claims (1)

[Claims] A center float (9) that extends to the front of the aircraft is attached to the lower part of the aircraft so that it can move up and down, and the center float (9)
A linking rod (28) is installed between one end of a swinging arm (27) that can freely swing around the upper horizontal axis (P_6) and the center float (9), and a linking rod (28) is installed between the center float (9) and the driving wheel (3a).
, (3b) rotary type control valve for lifting/lowering drive (
14), whose operating axis (14a) is aligned with the horizontal axis (P_6).
) and at a different position from the horizontal axis (P_6), and the operating portion (26) of the operating shaft (14a) and the swing arm (27) The wheels (3 a )
, (3b) are configured to be driven up and down, and the swing arm (27) is received at a position corresponding to the neutral stop position of the control valve (14) in conjunction with the disengagement operation of the main clutch (30). and a state in which the swinging arm (27) is allowed to swing over the operating range of the control valve (14) in conjunction with the engagement operation of the main clutch (30). The restraining member (3
4) A walk-behind paddy field work machine.