JPH0649132Y2 - Horizontal attitude control device for paddy field vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a horizontal attitude control device for a paddy field vehicle such as a rice transplanter, a fertilizer applicator, and a seeder.

[Problems to be Solved by Prior Art and Invention] Conventionally, as a horizontal control device provided in this kind of paddy field vehicle, for example, as shown in JP-A-62-118814, vertical movement control and horizontal attitude There is one in which control is performed using a lift control cylinder and a horizontal control cylinder.

By the way, this one controls the left / right posture of the machine by operating the horizontal control cylinder in the front / rear direction. Since it is necessary to provide a space for arranging the cylinders, the position where the cylinders are arranged is biased to one of the left and right sides of the machine body, which causes a problem that the left-right balance of the machine body is impaired. .

Therefore, it is proposed to provide a horizontal control cylinder that operates in the left-right direction and controls the horizontal horizontal posture at the tip of the lifting control cylinder. However, in such a case, the lifting control valve, the horizontal control valve, and what kind of switching operation mechanism of these valves are compactly arranged, and further, they move back and forth based on the operation of the lifting control cylinder. Regarding the piping that connects between the horizontal control cylinder and the horizontal control valve, how to make it short while responding to the forward and backward movement,
And there is no study on whether to prevent the operation of other members.

[Means for Solving the Problem] The present invention was conceived with the object of providing a horizontal attitude control device for a paddy field work vehicle capable of eliminating these drawbacks in view of the above circumstances. In a paddy field vehicle equipped with a lifting control cylinder that operates in the front-rear direction to control the lifting and lowering of the machine body and a horizontal control cylinder that controls the horizontal attitude, a tip of the lifting control cylinder is provided. Is provided with a horizontal control cylinder that operates in the left-right direction and performs horizontal horizontal posture control based on the swing of the balance arm, and a lift control valve is provided at the base end of the lift control cylinder. The valve switching work mechanism for switching the lifting control valve is installed on either side of the vertical control valve while the horizontal control valve is installed on the other side of the lifting control valve. A valve switching actuation mechanism for switching the horizontal control valve is arranged above the descending control valve, and further, a pipe interposed between the horizontal control valve and the horizontal control cylinder is provided. It is characterized in that the base end portion is connected to the other side of the horizontal control valve, and the lifting control cylinders are arranged in a substantially S-shape so as to intersect in a plan view.

With this configuration, the present invention makes it possible to incorporate the horizontal attitude control mechanism by the horizontal control cylinder as it is, based on the machine body that does not have the horizontal attitude control by the horizontal control cylinder.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling machine body of a walk-behind rice transplanter which is an example of a paddy field vehicle, an engine 3 is provided in a front portion of a body frame 2 of the traveling machine body 1, and a seedling mounting table 4 is provided in a rear portion thereof. The provision of members such as the planting claw 5 and the driving handle 6 is the same as conventional ones. Further, 7 is a traveling wheel, 8 is a chain case, and 9 is a bonnet, which is the same as before.

A center float (main float) 10 is mounted below the machine body frame 2, and sensing floats 11 are arranged on both front left and right sides of the center float 10. The shape of this sensing float 11 is such that the inner edge is
The center float 10 has a shape that approximately matches the shape of the outer part that bulges in the left-right direction, and the bottom surface has a shape that is constricted inside so that mud flows into the gap between the sensing float 11 and the center float 10. There is. This sensing float 11
The bracket 12 is integrally attached to the front part of
The bracket 12 is pivotally supported by a front end portion of a support frame 13 which is integrally fixed to the body frame 2 side and extends from the engine base 3a side via a support shaft 12a so as to be vertically swingable. Then, the sensing float 11 has a rear portion which is in a low position and swings up and down following the unevenness of the tiller. A support shaft 14 is further rotatably supported on the middle portion of the support frame 13 through a bracket 13a so as to be rotatable about its axis. The extension is provided so that the upward movement of the sensing float 11 is restricted to the range until the sensing float 11 contacts the support shaft 14. Further, the guide plate 15 is provided on the rib 11a formed on the upper surface of the rear portion of the sensing float 11 (rearward from the support shaft 14 portion).
The lower end of the support shaft is pivotally supported by a pin 15a, and the support shaft 14 is slidably fitted to 15b formed on the guide plate 15, and the sensing float 11 swings up and down. It is designed to serve as a guide.

A ring 16 is attached to the front bracket 12 of the sensing float 11.
The upper end portion of the is integrally fixed, 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. Further link above
The lower end of the sensing rod 19 is swingably connected to the other arm 17b of the rocking rod 17. And when the sensing float 11 is swung up and down around the axis of the support shaft 12a following the unevenness of the cultivator,
Link 16, link 18, link 17 linked to this swing
The sensing rod 19 is adapted to perform an up / down sensing operation by the link operation of. Incidentally, 20 is a bumper integrally provided on the engine base 2a.

On the other hand, reference numeral 21 denotes a lifting control cylinder whose cylinder cylinder 21a side is integrally attached to the machine body frame 2 side through an appropriate fixing member such as a bracket 2c.
The cylinder rod 21b extends and contracts rearward, and the balance arm is attached to the tip of the lifting control cylinder 21.
A central portion of 22 is attached so as to be horizontally swingable via a support shaft 22a. And both ends of this balance arm 22 are connected to each other.
Although it is connected to the side of the chain case 8 through 23,
The balance arm 22 is a guide rod that is integrally assembled to the body frame 2 side when the lifting control cylinder 21 expands and contracts.
While being guided by 24, the robot moves back and forth, and by this, the vertical displacement of the traveling wheels 7 is simultaneously performed to control the vertical movement of the machine body.

A holder slidably attached to the guide rod 24.
A return type horizontal control cylinder 26, in which both ends of a cylinder rod 26a are fixed, is provided at 25. Also holder
The tip of the arm 25a protruding from 25 is swingable at the base end of the arm 22b integrated on the balance arm 22 side at a position substantially coaxial with the support shaft 22a of the balance arm 22 via a pin 22c. On the other hand, a pin 26c projecting from a cylinder tube 26b of the horizontal control cylinder 26 is engaged with a long hole 22d formed at the tip of the arm 22b. And as will be described later, the horizontal control valve
By switching 28, the horizontal control cylinder 26 becomes the cylinder tube 26b.
The balance arm 22 horizontally oscillates about the support shaft 22a as a fulcrum by performing a displacement operation in the left-right direction of the vehicle. It is designed to do 25b is a guide hole for the pin 26c formed in the holder 25.

Reference numeral 27 denotes a lifting control valve integrally attached to the front portion (base end portion) of the lifting control cylinder 21.
Is, for example, configured to switch in association with vertical movement detection following the change in the field of the center float 10, and to perform the expansion and contraction operation of the lift control cylinder 21,
One side of this lift control valve 27 (right side in the embodiment)
Is provided with a sensing rod 41 that senses the vertical movement of the center float 10 and switches the lift control valve 27. On the other side (the left side in the embodiment), a horizontal control valve 28 is provided. Can be integrally assembled via an appropriate connecting member such as the connecting plate 29 and the bolt 29a. Further, a bracket 30 is integrally fixed to a bolt 30a on the upper surface of the lift control valve 27, and a support shaft 31 integrally fixed to the bracket 30 is provided with a support shaft 32.
On the other hand, 33 is a plate-like swing arm having a substantially U-shape in a plan view, and a central portion of the swing arm 33 is integrally provided with a substantially inverted L-shaped auxiliary plate 33a toward the rear. ing. And swing arm 3
3 indicates that the support shaft 32 swingably penetrates the tip end portion of the auxiliary plate 33a and the swing arm 33 in a state in which the bent tip piece of the auxiliary plate 33a is swingably applied to the support plate 31. Is supported so as to be vertically swingable around the support shaft 32. Both ends 33b of the swing arm 33
The operating shaft 34 is pierced and supported so as to be rotatable around the shaft center while the movement in the shaft center direction is restricted by the E pin 34b. A mounting piece 30b is formed on the bracket 30 so as to be bent rearward, and a mounting hole 30c for mounting the fuel tank 35 is formed in the mounting piece 30b.

One end portion of the swing arm 33 extends long toward the horizontal control valve 28 side assembled to the side of the lifting control valve 27 as described above, and the extension pin 33c is connected to the connecting pin 33d. The spool 28a of the horizontal control valve 28 is fixed via the. As will be described later, the swing arm 33 swings up and down with the support shaft 32 as a fulcrum to push and pull the spool 28a, thereby switching the horizontal control valve 28. In the neutral state, that is, when the sensing float 11 is in the same height posture on both the left and right sides, the swinging arm 33 is oriented in the horizontal direction in a front view, the support shaft 32, and the connecting pin of the spool 28a. The 33d has an arrangement configuration in which it is located on a substantially straight line and at substantially the same height position.

Further, the swinging of the swinging arm 33 is performed by the following structure. That is, the base ends of the link plates 34a are integrally fixed to the left and right ends of the actuating shaft 34 described above, and one end of the link plate 34a is provided with a pin of a substantially L-shaped adjuster plate 36. It is pivotally connected via 36a. Further, the other end of the adjuster plate 36 is provided with an upper end portion in which the screw groove 19a of the sensing rod 19 is engraved so as to be loosely fitted and penetrated by a nut 19b so that the rod length can be adjusted. When the left and right sensing floats 11 oscillate oscillatingly due to changes in the unevenness of the cultivator, the oscillating arms are moved by the reverse movement of the sensing rods 19 interlocked with the oscillating arms.
33 swings up and down with the support shaft 32 as a fulcrum, whereby the spool 28a is pushed and pulled, the horizontal control valve 28 is switched and controlled, and the traveling wheel 7 on the worth float 11 side is moved upward. The horizontal control cylinder 26 is operated so as to swing the balance arm 22 on the side where the horizontal control valve 28 moves downward. In this way, the valve switching operation mechanism of the horizontal control valve 28 causes the lifting control valve 27 to move. It is configured above. By the way, when the sensing float 11 swings up and down at the same time, the actuating shaft 34 is absorbed by being rotated about the axis of the swing arm 33.

Further, from the horizontal control valve 28 to the horizontal control cylinder.
The pipe 37 to the 26 extends from the outer surface of the horizontal control valve 28, is arranged in a substantially S-shape that crosses the lifting control cylinder 21 and reaches the cylinder tube 26b from the opposite side. The return pipe 39 from 28 to the transmission case 38 side is laid along the outside of the side frame of the engine air cleaner 40 arranged in front of the lift control valve 27 so as to bypass the return oil cooling. Is able to do. Further, 42 is a hydraulic pump.

In the embodiment of the present invention configured as described above, the horizontal control cylinder 26 is provided at the tip of the lifting control cylinder 21.
Like the balance arm 22, it can be arranged in a long state in the left-right direction. This eliminates the need to secure a long mounting space in the front-rear direction at a position biased to either the left or right of the machine, unlike the conventional one that operates in the front-rear direction. As a result, one side of the machine 1 for horizontal control is provided. It is not necessary to secure the installation space of the cylinder 26, and it is sufficient to secure the installation space by arranging the cylinder 26 side by side. Therefore, it is not possible to achieve compactness, and the left and right balance of the machine body 1 is also achieved. Will be improved.

Moreover, this is the base of the lifting / lowering control cylinder 21,
A horizontal control valve 28 is arranged beside the lift control valve 27, which is a member device required for controlling the attitude control of the machine body 1, and a valve switching operation mechanism for switching the lift control valve 27 is provided. The valve switching actuation mechanism of the horizontal control valve 28 is arranged on the left side of the lifting control valve 27 and above the lifting control valve 27, respectively. Both the left and right sides and the upper side are reasonably centrally arranged in a state where the respective members do not interfere with each other, which can greatly contribute to downsizing.

In addition, the horizontal control valve 28 and the horizontal control cylinder 26
The pipe between and has a base end connected to the other side of the horizontal control valve 28, and is arranged so that the lifting control cylinder 21 intersects in a plan view so as to be substantially S-shaped rearward. Therefore, the pipe itself has a good left-right balance, and moreover, when the horizontal control cylinder 26 moves back and forth by the operation of the lifting control cylinder 21, the pipe can be bent without breaking. Even if it is short, it is possible to supply pressure oil smoothly and accurately perform horizontal attitude control, and it is possible to avoid interfering with other members such as the valve switching actuating mechanism. It will be.

On the other hand, since the return oil pipe 39 extending from the horizontal control valve 28 to the transmission case 38 is arranged along the outer frame of the air cleaner 40, the return oil can be cooled, which increases the oil temperature. It is convenient because it can be suppressed as much as possible. The pipe 39 has a structure arranged on the side opposite to the exhausted air heated by the engine 3, and is arranged at a portion where the outside air positively flows due to the outside air suction action of the air cleaner 40. Beyond prevention of oil temperature rise, positive cooling of oil can be ensured. Moreover, since the pipe 39 is connected to the oil supply port 38a of the transmission case 38, the oil can be reliably returned to the transmission case 38, and can be easily additionally attached to the assembly as an assembly.

Further, in the embodiment, since the bracket supporting the swinging arm 33 is also used as the mounting member of the fuel tank 35, there is also an advantage that the structure can be simplified.

[Advantages] In short, since the present invention is configured as described above, the horizontal control cylinder is arranged at the tip of the lifting control cylinder in a long state in the left-right direction like the balance arm. What can be done is that it is not necessary to secure a long mounting space in the front-rear direction at a position biased to either the left or right of the machine like the conventional one that operates in the front-rear direction. It is not necessary to secure the installation space of the machine, but it is sufficient to secure the installation space by arranging it side by side with the balance arm. This not only allows compactness, but also improves the left-right balance of the aircraft. .

In addition, this is a lift control cylinder, which is a member device necessary for controlling the attitude of the aircraft, and a lift control valve, a horizontal control valve, and a valve switching operation mechanism for switching between these valves. It is possible to achieve a compact arrangement in which the elevator control valves are reasonably centrally arranged on the left and right sides thereof and above the valves, without interfering with each other.

In addition, the pipe between the horizontal control valve and the horizontal control cylinder is connected to the other side of the horizontal control valve at the base end, and the lifting control cylinder is crossed in a plan view so as to be substantially rearward. Since it is arranged in an S-shape, the left and right balance of the pipe itself is good, and when the horizontal control cylinder moves back and forth due to the operation of the lift control cylinder, the pipe flexes without breaking. What can be done is that even if it is short, the pressure oil can be smoothly supplied, the horizontal posture control can be accurately performed, and the interference with other members such as the valve control mechanism can be avoided. Become.

[Brief description of drawings]

The drawings show an embodiment of a horizontal posture control device for a paddy field vehicle according to the present invention. Fig. 1 is a side view of a walk-behind rice transplanter, Fig. 2 is a plan view of the same, and Fig. 3 is the same. The front view of the horizontal control mechanism, FIG. 4 is the side view of the sensing float, and FIG.
The figure shows a side view of the frame without the sensing float.
7 is a plan view of the same, FIG. 7 is a perspective view of a valve for horizontal control, FIG. 8 is a plan view of a control cylinder, FIG. 9 is a side view of the same, and FIG. 10 is a front view of the same. In the figure, 1 is a traveling machine body, 21 is a lifting control cylinder, 22 is a balance arm, 26 is a horizontal control cylinder, 27 is a lifting control valve, and 28 is a horizontal control valve.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP 62-118814 (JP, A) JP 62-285715 (JP, A) JP 56-16893 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A lifting control cylinder for a paddy field vehicle comprising a lifting control cylinder that operates in the front-back direction to control the lifting and lowering of a machine body, and a horizontal control cylinder that controls left and right horizontal attitude control. A horizontal control cylinder that is operated in the left-right direction to control the left-right horizontal posture based on the swing of the balance arm is provided at the distal end of the, and a lifting control valve is provided at the proximal end of the lifting control cylinder. A valve switching actuating mechanism for switching the lifting control valve is installed on either side of the lifting control valve, while a horizontal control valve is installed on the other side of the lifting control valve. ,
A valve switching actuation mechanism for switching the horizontal control valve is provided above the lift control valve, and
Further, the pipe interposed between the horizontal control valve and the horizontal control cylinder is connected so that the base end is connected to the other side of the horizontal control valve, and the lifting control cylinder intersects in a plan view. A horizontal attitude control device for a paddy field vehicle, which is characterized by being arranged in a substantially S shape.