JPH048207A - Walking-type working machine in paddy field - Google Patents

Abstract

PURPOSE:To readily change a shear pin without attaching of mud by installing a releasable cover covering gears on a side face of an upper part of a mission case. CONSTITUTION:A second gear 44 is fixed to a second transmission shaft 42 by a shear pin 55. Thereby, in recessing of a working machine in engaging a shift gear 49 with a forth gear 54 of the second transmission shaft 42, the shear pin 55 is broken by application of overload to stop the machine body. Then, a cover is opened and the shear pin 55 is changed. In said case, the change of the shear pin 55 is readily performed because the second gear 44 and the cover 56 are located in high positions from the surface of paddy field and a gap between the cover 56 and wheels having a transmission case is wide because a mission case is located to one side from a center of left and right in the machine body.

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]

A walking rice transplanter, which is a type of walking rice paddy work machine, is equipped with flat lugs on the running wheels in order to travel through soft rice fields, so that the driving force of the wheels when moving forward is well transmitted to the rice fields. That's what I do. In this case, the rug is set to move upward from within the paddy field in an inclined position so that mud can easily slide off the rug when the rug moves from within the paddy field to the surface of the rice field.

However, when moving backwards, mud resistance acts on the opposite side of the lug, causing the wheels to sink further into the paddy field. Furthermore, when the lug moves from inside the paddy field to the surface of the paddy field, mud is lifted up on the opposite side of the lug, creating resistance to running.

Therefore, when going backwards, a large load is applied to the traveling system, so in order to prevent damage due to overload, for example,
There is a structure as disclosed in Japanese Patent No. 05405. In other words, the wheels are attached to the axles ((7) in the above publication) via shear pins ((9) in the above publication), and when a large load is applied when going backwards, the shear pins are cut and the large load is not applied to each part. -ing

[Problem to be solved by the invention]

If the shear pin is cut in a structure using a shear pin as described above, it is necessary to replace the shear pin, but since the axle of the wheel as described above is close to the field surface, a lot of mud adheres to it.

Therefore, it is extremely difficult to replace the thin and small shear pins when they are covered with so much mud.

Here, an object of the present invention is to facilitate the replacement of shear pins.

[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 pair of transmission shafts of the reverse transmission system are made to protrude outward from one side of the upper part of the transmission case for driving, which is located above the surface, and a gear is fixed to one of the protruding ends of both transmission shafts. A gear is attached to the other protruding end via a shear pin, and the two gears are engaged so that the power for reverse movement is transmitted to the wheels via the two gears, and a removable cup that covers both the gears is provided. The reason is that \- is provided, and its functions and effects are as follows.

[For production]

In walk-behind rice transplanters, etc., the traveling transmission case is located above the rice field, so mud does not adhere to the upper side of the transmission case much. Therefore, if the above-mentioned structure is provided on the upper side of the transmission case, the shear pin can be easily replaced by removing the cover without getting mud on the shear pin.

〔Effect of the invention〕

As described above, it has become possible to replace the shearing pin without mud adhesion, and it has been possible to improve the ease of replacing the shearing pin and the workability.

〔Example〕

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

As shown in Figure 8, the transmission case for driving (1)
A pair of transmission cases (2) are located on the left and right sides of the horizontal axis (P,
), and this transmission case (2
) is equipped with running wheels (3aL (3b)) to support the machine.The rear of the machine is equipped with a seedling arm (4), a seedling stand (5), etc. A planting device and a control handle (6) are provided, and between the mission case (1) and the planting arm (4) there is a tank (7) and a feeding device that feeds out the fertilizer in the tank (7). (
8) is provided.

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. 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 downward tilting position.

Next, the vertical drive structure of the left and right wheels (3a) and (3b) will be explained. As shown in Figure 3.5.8, 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 loft (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 (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 wheels (3a),
(3b) are driven to swing up and down in the same direction.

Then, as shown in FIGS. 3 and 5, the support arm (2
0) and the bracket (22) fixed to the left mouth and door (22).
23) and a double-acting second hydraulic cylinder (24).
are connected by construction. 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. In conjunction with this operation, the balance arm (21) is swung counterclockwise in FIG. 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. 3 and 5, a swingable Narok member (64) is attached around the vertical axis (P,) of the lower balance arm (21). The state shown in Fig. 5 is achieved by controlling the left and right wheels (3a) 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 bottle (20a) of the support arm (2o)
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 Fig. 3 and Fig. 8, the Minshigon case (1) is located at the front of the fuselage, and is offset to the left in Fig. 4 from the left-right center (A) of the fuselage. 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 3.4.6, a support bracket (16) is fixed to the front upper surface of the center float (9).
) is fixed to the operating arm (17).

The horizontal shaft center (P5) is located at the lower front of the mission case (1).
A rondo (19) that can only swing up and down is connected to the elongated hole (16a) of the support bracket (16) and the operating arm (17).
) is inserted across the first elongated hole (17a).

Further, a rond (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 rond (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.

The swing arm (27) is swingable about a horizontal axis (P,) 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
7), an L-shaped linking rond (28) is constructed and connected to one end. In addition, the first control valve (
The operating portion (26) of the operating portion (14) is biased counterclockwise in FIG. 6 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 port and throat (
The first control valve (14) is controlled by the swing arm (28) and the swing arm (27).
) is operated, and 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 Figure 1) 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 8.
(32) are interlocked and connected via a wire (33), a check member (34) that can swing freely around the horizontal axis (P,), 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, an L-shaped operating arm (53) shown in FIG. 6 is linked to an operating lever (not shown) via a wire (66). In other words, by operating the operating lever, the first control valve (14) can be forcibly operated by the operating arm (53) to lower the wheels (3a) and (3b) via the operating section (26).

As shown in Figures 4 and 6, the mission case (1
) A bell crank (39) is swingably attached around the front horizontal axis (P8), 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 a linkage ring (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 connecting rond (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. 1 and 2, power from the gasoline engine (12) is transmitted to the input pulley (36) of the transmission case (1) via a transmission heald (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. 4 and 6.

From the side opposite to the side where the mission case (1) is deviated from the left and right center (A) of the fuselage (the left side in Fig. 1), 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 (4G), 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), power is transmitted to the wheels (3a) and (3b) in the reverse state. In this case, as shown in FIG. 1, the second gear (44) is fixed to the second transmission shaft (42) with a shear pin (55). As a result, when the shift gear (49) is engaged with the fourth gear (54) of the second transmission shaft (42) and the aircraft is moving backward, if an overload is applied, the shear bin (55) is sheared and the aircraft stops.

In this case, open the cover (56) and use the shear pin (55).
As shown in Figure 1.6.8, the second gear (44) and cover (56) must be located high above the field, and the mission case (1) must be on the left and right sides of the aircraft. Since the cover (56) is deviated to one side from the center (A), the distance between the cover (56), the transmission case (2), and the wheel (3b) is wide, so that the shear pin (55) can be easily replaced.

Further, the work of replacing the first and second gears (43) and (44) with other gears having different transmission ratios can be easily performed.

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,
Fig. 1 is a longitudinal cross-sectional rear view of the mission case, Fig. 2 is a longitudinal cross-sectional schematic side view of the mission case, Fig. 3 is a plan view of the mission case and the vicinity of the first and second hydraulic cylinders, and Fig. 4 is a longitudinal cross-sectional view of the transmission case and the vicinity of the first and second hydraulic cylinders. FIG. 5 is a plan view of the support arm and the vicinity of the second hydraulic cylinder, and FIG. 6 is a front view showing the linkage structure between the first and second control valves and the center float. FIG. 7 is a side view of the vicinity of the swinging arm in a state in which lunch is mainly cut and operated, and FIG. 8 is an overall side view of the walking rice transplanter.

Claims (1)

[Claims] A pair of transmission shafts (38) and (42) of the reverse transmission system are made to protrude outward from one side of the upper part of the transmission case (1) for traveling, which is located above the rice field. A gear (43) is fixed to one of the protruding ends of (42), a gear (44) is attached to the other protruding end via a shear pin (55), and both gears (43) and (44) are engaged. The power for reversing is transmitted to both gears (43) and (44).
A walking paddy field working machine configured to transmit power to the wheels (3a), (3b) via the gears (43), (44), and provided with a removable cover (56) that covers both the gears (43), (44).