JPH0455454Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a horizontal posture control device for rice field work vehicles such as rice transplanters, fertilizers, and seeding machines.

[Problems to be solved by the prior art and the invention] Conventionally, as a horizontal control device installed in this type of paddy field work vehicle, as shown in Japanese Patent Laid-Open No. 62-118814, for example, the intermediate part swings on the body side. Both sides of the swinging arm, which is freely pivoted, are connected to the left and right sensing floats via sensing rods, while the spool of the aircraft horizontal control valve is connected to the swinging arm. There is a device in which the spool is pushed and pulled by the swinging of the swinging arm in conjunction with the vertical swinging, thereby switching the valves and controlling the left and right horizontal posture of the aircraft body. However, in this device, the swinging arm is cylindrical, and both ends of the swinging arm are slidably fitted into the operating shaft, which is connected to the sensing rod side so as to be rotatable around the axis. There is a drawback that muddy water or the like enters the inside of the cylinder, causing rust or clogging, which prevents smooth rotation of the operating shaft.

[Means for solving the problem] The present invention was created in view of the above-mentioned circumstances with the aim of providing a horizontal attitude control device for a paddy field work vehicle that can eliminate these drawbacks. , both ends of the swinging arm, which is pivotably supported on the aircraft side, are connected to the left and right sensing floats via sensing rods, while the spool of the aircraft horizontal control valve is connected to the swinging arm. , in the paddy field work vehicle configured to control the left and right horizontal posture of the machine body by pushing and pulling the Senki spool by the swinging of the swinging arm connected to the opposite vertical swing of the sensing float to switch the valve. The swing arm is approximately U-shaped, and an operating shaft connected to the sensing rod side is rotatably supported on both sides of the swing arm to absorb the simultaneous vertical swing of the sensing float. This is a characteristic feature.

With this configuration, the present invention is capable of smoothly and reliably rotating the operating shaft over a long period of time.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, reference numeral 1 denotes a traveling body of a walking rice transplanter, which is an example of a paddy field working vehicle, and an engine 3 is provided at the front of a body frame 2 of the traveling body 1, and a seedling stand 4, at the rear. The planting claws 5, the operating handle 6, and other members are all the same as before. Furthermore, 7 is a running wheel, 8 is a chain case, and 9 is a bonnet, which are also the same as before.

A center float (main float) 10 is installed below the fuselage frame 2.
Sensing floats 11 are arranged on both left and right sides of the front portion of the center float 10, respectively. The shape of the sensing float 11 is such that the inner edge approximately matches the shape of the outer portion of the center float 10 that bulges in the left-right direction, and the bottom surface is designed to prevent muddy water from forming between the sensing float 11 and the center float 10. It has a narrowed shape on the inside so that it can flow into the gap. A bracket 1 is installed in front of this sensing float 11.
The bracket 12 is attached to the support frame 1 extending from the engine base 3a side, which is integrally fixed to the fuselage frame 2 side.
The sensing float 11 is pivoted to the front end of the float 11 via a support shaft 12a so as to be able to swing vertically, so that the lower rear part of the sensing float 11 can swing up and down following the unevenness of the tiller. It's getting old. A support shaft 14 is further rotatably supported around the axis via a bracket 13a at the intermediate portion of the support frame 13, and the outer end of the support shaft 14 is connected to the sensing float 11.
The sensing float 11 extends to the upper surface area.
The upward movement of the sensor float 11 is restricted to a range until the sensing float 11 comes into contact with the support shaft 14. Furthermore, a guide plate 1 is attached to a rib 11a formed on the upper surface of the rear part of the sensing float 11 (behind the support shaft 14).
5 is pivotally supported by a pin 15a, and the support shaft 14 is slidably fitted into an elongated hole 15b formed in the guide plate 15, so that the sensing float 11 can swing up and down. It is designed to be a guide when moving.

Also, the front bracket 12 of the sensing float 11
The upper end of the link 16 is integrally fixed to the support shaft 14, while a link 17 is further pivotally supported on the support shaft 14 so as to be vertically swingable. A connecting link 18 is interposed between one arm 17a of the link 17 and the lower end of the link 16. Furthermore, a sensing rod 1 is attached to the other arm 17b of the link 17.
The lower end portion of 9 is pivotably connected. Then, the sensing float 11 follows the unevenness of the tiller to the support shaft 12.
When it swings up and down around the axis of a, the link 16, the connecting link 18, and the link 1 that are linked to this swing
By operating the link 7, the sensing rod 19 operates to sense up and down. Note that 20 is a bumper that is integrally provided on the engine base 2a.

On the other hand, 21 is a lift control cylinder whose cylinder tube 21a side is integrally attached to the fuselage frame 2 side via an appropriate fixing member such as a bracket 2c. The central part of the balance arm 22 is attached to the support shaft 2 at its tip.
2a so as to be horizontally swingable.
Both ends of this balance arm 22 are connected to the connecting rod 2.
3, the balance arm 22 is connected to the chain case 8 side through a guide rod 24 that is integrally assembled to the fuselage frame 2 side when the lift control cylinder 21 is expanded or contracted. As a result, the traveling wheels 7 are simultaneously moved up and down to control the vertical movement of the aircraft.

Furthermore, a double-acting horizontal control cylinder 26 has both ends of a cylinder rod 26a fixed to a holder 25 that is slidably attached to the guide rod 24.
is provided. Further, the distal end of the arm body 25a protruding from the holder 25 is attached to the base end of the arm body 22b integrated on the balance arm 22 side.
A pin is pivotally supported via a pin 22c at a position approximately concentric with the horizontal control cylinder 26, and a pin protrudes from the cylinder tube 26b of the horizontal control cylinder 26 in a long hole 22d formed at the tip of the arm body 22b. 26c is fitted and engaged. As will be described later, by switching the horizontal control valve 28, the horizontal control cylinder 26 displaces the cylinder tube 26b in the left-right direction, so that the balance arm 22 can horizontally swing around the support shaft 22a. As a result, the left and right traveling wheels 7 move vertically in opposite directions, thereby controlling the horizontal plane of the aircraft. Note that 25b is a guide hole for a pin 26c drilled in the holder 25.

Reference numeral 27 denotes a lift control valve integrally attached to the front part of the lift control cylinder 21, and the valve 27 is switched in conjunction with sensing of the vertical movement of the center float 10 following changes in the field surface, for example. A horizontal control valve 28 is connected to the side of the lift control valve 27 (on the left side in the embodiment) by a connecting plate 29 and a bolt. They can be integrally assembled via appropriate connecting members such as 29a. Further, a bracket 30 is integrally fixed to the upper surface of the lift control valve 27 with bolts 30a, and a support plate 31 integrally fixed to the bracket 30 has a support shaft 32 projecting therefrom. On the other hand, reference numeral 33 denotes a plate-shaped swinging arm that is approximately U-shaped in plan view, and an auxiliary plate 33a that is approximately inverted L-shaped is integrally provided at the center of the swinging arm 33 to protrude rearward. ing. The swinging arm 33 is configured such that the supporting shaft 32 is in a state where the bent end piece of the auxiliary plate 33a is slidably applied to the support plate 31.
It is supported so as to be able to swing up and down about a support shaft 32 by swingably passing through the tip of the swing arm 33 and the swing arm 33 . An operating shaft 34 is supported through both side pieces 33b of the swinging arm 33 so as to be rotatable around the axis while movement in the axial direction is restricted by an E pin 34a. . Further, a mounting piece 30b is formed by bending the bracket 30 toward the rear, and a mounting hole 30c for assembling the fuel tank 35 is bored in this mounting piece 30b.

As described above, one end of the swing arm 33 extends long toward the horizontal control valve 28 assembled to the side of the elevation control valve 27, and a connecting pin 33d is attached to the extending piece 33c. The spool 28a of the horizontal control valve 28 is fixedly attached via a bolt (in the embodiment, it is formed by a bolt). That is, the extending piece 33c is formed with a long hole-shaped flexible part 33e in the left-right direction, and this flexible part 33e
A connecting pin 33 protrudes from the spool 28a side.
This connecting pin 33d is clamped and fixed to the spool 28a by a double nut 33f, and the part that passes through from the swinging arm 33 has an E pin, an R pin, or a split pin, for example. A regulating body 33g formed of appropriate members such as
This regulating body 33g prevents the connecting pin 33d from coming off, and also prevents the swinging arm 33, which swings about the support shaft 32, from wobbling in the pin direction. I'm starting to do it. As will be described later, the swinging arm 33 swings up and down about the support shaft 32, thereby pushing and pulling the spool 28a, thereby switching the horizontal control valve 28. Moreover, in a neutral state, that is, when both the left and right sensing floats 11 are at the same height, the swinging arm 33, this support shaft 32, and the connecting pin of the spool 28a, which face in the horizontal direction when viewed from the front. 33d are arranged so that they are located substantially in a straight line and at substantially the same height.

Further, the vertical swinging of the swinging arm 33 is achieved by the following configuration. In other words, the base end portions of the link plates 34a are integrally fixed to both left and right ends of the operating shaft 34 described above.
There is an approximately L-shaped adjuster plate 36 at the tip of a.
One piece is pivotably connected via a pin 36a. Furthermore, the upper end portion of the sensing rod 19 having a threaded groove 19a is attached to the other piece of the adjuster plate 36 in a loosely fitted manner so that the length of the rod can be adjusted using a nut 19b. When the left and right sensing floats 11 swing in a counterclockwise direction due to changes in the unevenness of the tiller, the swinging arm 33 is supported by the counterclockwise movement of the sensor rod 19 in conjunction with this. Swings up and down using the shaft 32 as a fulcrum,
As a result, the spool 28a is pushed and pulled, the horizontal control valve 28 is switched and controlled, and the balance arm 22 is swung to the side where the traveling wheel 7 on the sensing float 11 side that has moved upward moves downward. The horizontal control cylinder 26 is configured to operate in this manner.
Incidentally, if the sensing float 11 simultaneously swings up and down, the movement is absorbed by the actuating shaft 34 rotating about the axis relative to the swinging arm 33.

In addition, the piping 37 from the horizontal control valve 28 to the horizontal control cylinder 26 is connected to the horizontal control valve 28.
Approximately
The horizontal control valve 2
A return pipe 39 from 8 to the transmission case 38 side is routed along the outside of the side frame of the engine air cleaner 40 disposed in front of the lift control valve 27 to cool the return oil. I am now able to do this.

In the embodiment of the present invention configured as described above, as described above, the pushing and pulling operation of the spool 28a in the horizontal control valve 28 causes the left-right sensing float 11 to swing up and down in opposite directions due to the unevenness of the tiller. In this case, the swinging arm 33
This is achieved by swinging up and down using the support shaft 32 as a fulcrum. On the other hand, sensing float 1
1 swings up and down at the same time, the swinging arm 33
Only the actuating shaft 34, which is rotatably supported around the axis, rotates and its movement is absorbed, and does not act on the swinging arm 33.

In this way, the operation accompanying the simultaneous up-and-down movement of the sensing float 11 is absorbed by the rotation of the actuation shaft 34 around the axis, but the actuation shaft 34 is not a cylindrical movement as in the past. Rather than penetrating the arm and being slidable around the axis, there is a shaft bearing that is supported at two points on both sides 33b of the substantially U-shaped swinging arm 33 and is rotatable around the axis. has been done. Therefore, the sliding area of the operating shaft 34 with the swing shaft 33 is small, and malfunctions due to rust or clogging with mud are reliably prevented, resulting in a smooth and reliable operating shaft 3 for a long time.
4 rotations will be made.

Moreover, this one has an extending piece 33 extending in a straight line from one side end of this substantially U-shaped swinging arm 33.
Since the structure is that the spool 28a is connected to c,
It has a simple structure and can perform highly accurate horizontal attitude control.

In addition, in this invention, the swinging arm is approximately U-shaped,
It is sufficient that the actuating shaft connected to the sensing rod side is rotatably supported on both sides of the rod so as to absorb the simultaneous up-and-down movement of the sensing float. The connecting portion is not limited to the one provided on the extending piece, but a connecting portion with the spool may be provided between both side pieces, for example, as shown in FIG.

[Operations and Effects] In summary, the present invention is constructed as described above, so that the swinging arm that senses and swings around the support shaft in response to the opposite vertical movements of the left and right sensing floats,
Although the actuation shaft is rotatably supported around the axis to absorb the movement caused by the simultaneous up-and-down movement of the left and right sensing floats, the actuation shaft is not a cylindrical rocker like the conventional one. It is not rotatably supported on the movable arm, but rotatably supported on both sides of a substantially U-shaped member, so that the area of sliding contact with the swing arm is extremely small. Therefore, it is possible to reliably prevent problems such as rust on the sliding surfaces due to infiltrated muddy water or failure of rotation of the operating shaft due to clogging with mud, ensuring smooth, reliable, and highly accurate leveling over a long period of time. This will allow you to control your posture.

[Brief explanation of the drawing]

The drawings show an embodiment of the horizontal posture control device for a rice paddy work vehicle according to the present invention, in which Fig. 1 is a side view of the walking rice transplanter, Fig. 2 is a plan view of the same, and Fig. 3 is a side view of the walking rice transplanter. A front view of the horizontal control mechanism, Fig. 4 is a side view of the sensing float section, Fig. 5 is a side view of the frame section without the sensing float section, Fig. 6 is a plan view of the same, and Fig. 7 is a horizontal control valve. Perspective view of part, No. 8
The figure is a plan view of the control cylinder section, FIG. 9 is a side view of the same, FIG. 10 is a front view of the same, FIG. 11 is a horizontal sectional view of the swinging arm, and FIG. 12 is a swinging arm showing another example. FIG. In the figure, 1 is the traveling aircraft, 11 is the sensing float, 1
9 is a sensing rod, 28 is a horizontal control valve, 28
a is the spool, 32 is the support shaft, 33 is the swinging arm,
33b is a side piece, and 34 is an operating shaft.

Claims (1)

[Scope of utility model registration request] Both ends of the swing arm, which is pivotably supported on the aircraft side, are connected to the left and right sensing floats via sensing rods, while the spool of the aircraft horizontal control valve is connected to the swing arm. The valve is switched by pushing and pulling the spool by the swinging of the swinging arm linked to the opposite vertical swinging of the sensing float;
In a paddy field work vehicle configured to control the left and right horizontal posture of the machine body, the swing arm is approximately U-shaped, and both sides of the swing arm are connected to the sensing rod side so as to absorb the simultaneous vertical swing of the sensing float. A horizontal attitude control device for a paddy field work vehicle, characterized in that an operating shaft is rotatably supported around the axis.