JP2548423Y2 - Walking type rice field work machine - Google Patents

Description

[Detailed description of the invention]

[0001]

INVENTION The present invention relates, are those related to planting machine, fertilizer machine, seeding machine such as a walk-paddy working machine.

[0002]

2. Description of the Related Art
In this type of walk-behind field work machine, the balance arm connected to the swing case of the left and right traveling wheels is moved in parallel in the operation of the main cylinder based on the height detection of the body, and the left and right traveling wheels are moved up and down in the same direction. On the other hand, in the operation of the sub-cylinder based on the rolling sensing of the body, there is a structure in which the left and right traveling wheels are moved in opposite directions by swinging to control the attitude of the body. By the way,
Each cylinder has a valve device to activate it.
These valve devices are required to be assembled at predetermined positions on the fuselage.However, conventionally, a plurality of portions of the valve device are fixed with fasteners such as bolts, and a return pipe for discharging return oil is provided with a transformer. Since it was necessary to connect to the return destination of the mission case or the like via a hose or the like, there was no inconvenience that the assemblability was inferior and the number of parts increased.

[0003]

This invention SUMMARY OF THE INVENTION may, shall apply was conceived for the purpose of providing a walk-paddy working machine capable to wipe out these drawbacks in view of the above-mentioned circumstances, the right and left travel Connected to each wheel swing case
The balance arm is translated when the main cylinder is activated.
And move the left and right running wheels up and down in the same direction.
In the cylinder operation, swing left and right running wheels in the opposite direction.
Walk-behind field work machine that controls the attitude of the aircraft by moving it to
, The hydraulic operation of the main cylinder and the sub-cylinder
The valve unit that controls
And a spool for controlling the auxiliary cylinder
The transmitter unit is located on the upper end of the valve unit.
The fixed mounting part fixed to the case
On the other hand, the transmitter
Fit into the oil return port of the case case and shake the valve unit.
It is characterized in that a return pipe for stopping is protruded .

According to the present invention, with this configuration, the number of parts can be reduced and the structure can be simplified, and the valve unit can be used.
In which was to kill at improving the assembling of the Nitsuto.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, 1 is a walking type rice transplanter,
At the front of the body of the rice transplanter 1, an engine 2 and a transmission case 3 are vertically integrated, while
A planting work section 6 having a seedling mounting table 4, a planting mechanism 5, and the like is disposed at the rear of the body, and an output shaft 7 protruding from the left and right side surfaces of the transmission case 3 is provided on the left and right sides of the body. Running wheels 9 are provided via swing cases 8 which are supported so as to be able to swing up and down, and the power of the engine 2 is transmitted via the transmission case 3 to the planting work section 6 and the running wheels 9. The transmission case 3 and the planting work section 6
Are integrally connected and supported by the body frame 1a, and the connection height of the body frame 1a is set to be lower than the axle 10 of the left and right traveling wheels 9 so that the body frame 1a
A space S sandwiched between the left and right axles 10 is formed above.

Reference numeral 11 denotes a return-type main cylinder device.
The main cylinder device 11 includes a piston rod 11a, a cylinder cylinder 11b, and the like, and is disposed in front of the transmission case 2 and the engine 3 in an almost vertical posture that is steeply inclined in a front-to-back and rear-to-back manner. Piston rod 11
a bracket is integrally fixed to a cylinder head 2a formed at the upper end of the engine 2 through a bracket 12, and the other end projects forward from a front end of the transmission case 3. 13, a two-rod type in which the cylinder cylinder 11b moves in the rod length direction with respect to the piston rod 11a based on hydraulic pressure operation. It consists of a cylinder.

Reference numeral 14 denotes a balance arm which is long in the left-right direction, and an intermediate portion 14a of the balance arm 14 is
1b is pivotally supported by a pin shaft 15 projecting forward and backward from the upper end, while the left and right ends 14b are swinged by a connecting rod 17 pivotally connected via a connecting pin 16. It is connected to a swing arm 8b protruding from a base boss 8a of the case 8. Then, as described later, the cylinder cylinder 1 associated with the operation of the main cylinder device 11
1b, the balance arm 14 is pushed and pulled in a parallel posture, whereby the swing case 8 swings up and down simultaneously, and the left and right traveling wheels 9 are simultaneously moved up and down with respect to the body. However, various considerations have been made in the balance arm 14, which will be described below.

First, in the balance arm 14, the rod connecting position of the left and right end portions 14b is deviated rearward with respect to the cylinder connecting position of the intermediate portion 14a, so that a tapered shape covering the upper portion of the balance arm 14 is formed. Consideration is made so that the bonnet 18 can be formed as narrow as possible. That is,
When the balance arm 14 is covered with the tapered bonnet 18, it is advantageous to position the balance arm 14 as rearwardly as possible to reduce the width of the bonnet 18. There is a limit in the arrangement of the engine 2 and the like. For this reason, only the left and right end portions 14b, which are the connecting positions of the connecting rods 17, are set to the front and rear widths b which are narrower than the front and rear widths a of the intermediate portion 14a. On the other hand, it is biased backward.

In the balance arm 14, the left and right ends 1
By forming the upper side of the upper side 4b so as to be inclined lower toward the outer side, it is considered that the upper side can be compactly accommodated in the bonnet 18 whose upper surface is formed in a central bulging shape in a front view, thereby reducing the height of the bonnet 18. It can be as low as possible.

Further, in the balance arm 14, the push-up force from the traveling wheel 9 is connected to the intermediate portion 14a of the balance arm 14 by giving elasticity to the left and right end portions 14b at the rod connection positions. Consideration is given to absorption at a stage before reaching the main cylinder device 11 and a sub cylinder device 19 described later. That is, in the balance arm 14, while the middle portion 14a is formed in a cross-sectional shape consisting of front and rear hanging sides and an upper side, the left and right end portions 14b are formed only by front and rear hanging sides, thereby reducing the section modulus. Thus, the left and right end portions 14b have elasticity.

The swing arm 8b is provided so as to protrude forward from the base boss 8a of the swing case 8. That is, the swing arm 8b is positioned as close to the body as possible to improve the longitudinal balance of the body, and the swing direction of the swing arm 8b is set to the vertical direction, so that the vertical arrangement of the main cylinder device 11 is achieved. Although it is possible, at the swing lower limit position, the swing range is set so as to be accommodated in the float 20 having the bank 20a protruding from the periphery.

On the other hand, the sub-cylinder device 19 is interposed between the cylinder cylinder 11b of the main cylinder device 11 and the balance arm 14, and the balance arm 14
Is pivoted about the pin shaft 15 to move the left and right running wheels 9 up and down in the opposite direction to perform rolling control of the fuselage, which is controlled by the cylinder cylinder 11 b of the main cylinder device 11. They are arranged in parallel close to one side. This makes it possible to minimize the useless space between the main cylinder device 11 and the attitude control mechanism, thereby making the attitude control mechanism extremely compact. The amount of swing of the balance arm 14 with respect to is adjusted. Further, in the case of the balance arm 14 which swings based on the expansion and contraction operation of the sub-cylinder device 19, it is necessary to regulate the swing range with a stopper member or the like. In this embodiment, the balance arm 14 swings. The swing range is restricted by contacting the upper end of the cylinder cylinder 11b at the upper and lower limits of the range.

Numeral 21 designates a hydraulic valve unit for switching the operation of the two cylinder devices 11, 19, and a bracket 21a protruding from the upper end of the valve unit 21 toward one side is provided with a valve unit 21. The pendulum body 22 is supported so as to be able to swing left and right so as to be located on one side of the body. It is set at a position deviated laterally. Further, on one side surface of the valve unit 21, a sub-cylinder control spool 23 is provided so as to be able to protrude and retract, and its distal end is pivotally connected to an intermediate portion of the pendulum body 22 without a link or the like. That is, when the body is tilted left and right, the tilt is detected by the left and right swing of the pendulum body 22, and this detection is transmitted to the valve unit 21 via the spool 23 to cause the sub cylinder device 19 to expand and contract. The tilted aircraft is returned to the original proper horizontal position.

On the other side of the valve unit 21,
A main cylinder control spool 24 is rotatably projected, and the operation of the main cylinder device 11 is switched by the spool 24 in the following manner. That is, when the airframe rises and sinks with respect to the rice field due to unevenness of the cultivator, the float 20 swings up and down with respect to the airframe with the rear horizontal axis 25 as a fulcrum. This is transmitted to the spool 24 via the detection rod 26, whereby the hydraulic control of the main cylinder device 11 is performed so that the suspended body is returned to the original proper posture.

Reference numeral 27 denotes a link whose front is covered by a bumper B extending from the bracket 13 and whose intermediate portion in the vertical direction is rotatably supported by the machine body at a position below the pendulum body 22. The pin 27a protruding from the upper end of the link 27 is provided with a slot 2 formed in the pendulum 22.
A slit 27b formed on the lower end of the bracket 28 and extending vertically is loosely fitted on a pin 28a projecting from the upper end of a bracket 28 supporting the front side of the float 20. That is, during non-working traveling such as traveling on a road, the float 28 swings to the lower limit with the rear horizontal shaft 25 as a fulcrum, so that the pin 28a is disengaged from the slit 27b, thereby disconnecting the link 27 from the bracket 28. In this state, the free swing of the pendulum body 22 is allowed, but during work traveling, since the float 20 is swinging upward in the state of sliding on the rice field, the pin 28a is fitted into the slit 27b, and Accordingly, the link 27 is connected to the bracket 28 to restrict the free swing of the pendulum body 22, and based on the rolling detection of the float 20 rotating about the rear vertical axis 29 and the front vertical axis 30 as a fulcrum. The body 22 is forcibly swung right and left. As a result, the rolling control based on the inclination detection of the pendulum body 22 is performed during non-work traveling, while the rolling control based on the inclination detection of the float 20 is performed during working traveling. The position where the long hole 22a is formed in the pendulum body 22 is set below the spool connection position of the pendulum body 22 and on an extension of a straight line connecting the connection position and the fulcrum of the pendulum body 22.

The valve unit 21 is attached to the front end of the transmission case 3. In this case, a single fixed attachment portion 21b provided on the upper end side is attached to the transmission case 3. It is designed to be attached only by fixing it. In other words, the lower end of the valve unit 21 which is not fixed is shaken by fitting a return pipe 21c for discharging return oil projecting from the lower surface of the valve unit 21 into the oil return port 3a of the transmission case 3 side. It has become so.

In the embodiment of the present invention constructed as described above, when the body is tilted left and right, the tilt is detected by the right and left swing of the pendulum body 22, and this detection is detected via the spool 23 by the valve unit. By transmitting the transmission to the sub-cylinder unit 21, the sub-cylinder device 19 is extended and contracted to return the inclined body to the original proper horizontal posture. The valve unit 21 is arranged on one side of the pendulum body 22 and faces the same. Since the sub-cylinder control spool 23 is protrudingly provided on the surface, the spool 23 can be connected to the pendulum body 22 without using a link or the like. Accordance connexion, as those of the valve device via a link connected to pendulum body 22, based on the inconvenience of complicating the increase as well as the structure of the component parts as possible out <br/> solution extinguishing Rika, Yotsute link looseness The problem that the accuracy of the rolling control is reduced can also be prevented.

The valve unit 21 is provided with a return pipe 2 for projecting a return oil from a lower surface of the valve unit 21 for discharging return oil.
1c to the oil return port 3a on the transmission case 3 side.
Since the stop vibration that is fitted directly, it can be mounted even to fix a single fixed mounting portion 21b provided on the upper side of the transformer honey Chillon Case 3
You . Therefore, it is possible to reduce the number of fixed parts, or it becomes unnecessary to use a hose for connecting the return pipe 21c to the return destination. As a result, it is possible to reduce the number of parts and improve the assemblability.
I can measure .

Further, since the pendulum body 22 is supported by the valve unit 21, the pendulum body 22 and the valve unit 21 can be handled as one assembly, or the installation space can be reduced.

In addition, by disposing the valve unit 21 at a position deviated from the left and right center of the machine body, the pendulum body 22 arranged in parallel with the valve unit 21 is positioned at the center of the machine body with the least vibration. , Pendulum 2
2 can improve the inclination detection accuracy.

[0021]

[Effects] In summary, since the present invention is constructed as described above, it is based on the detection of rolling of the pendulum.
Rolling by the hydraulic switching operation of the valve unit
While operating the sub cylinder for control,
At the bottom of the valve unit, the transmission case side
A return that fits into the oil return port and locks the valve unit.
Provided on the upper end side when the pipe is projected
Fixed mounting part fixed to the transmission case
The valve unit can be mounted with just
Oil can be returned to the return pipe without allowing for the reduction of fixed locations
For connecting to the transmission case
Components such as bases can be eliminated, resulting in a reduction in the number of parts.
And the improvement of the assemblability can be measured.

[Brief description of the drawings]

FIG. 1 is a side view of a rice transplanter.

FIG. 2 is a plan view of the same.

FIG. 3 is a perspective view showing a frame structure.

FIG. 4 is a rear perspective view of the float.

FIG. 5 is a front view of a posture control mechanism.

FIG. 6 is a side view of the same.

FIG. 7 is an enlarged front view of a main part of the above.

8A is a rear view of the balance arm, FIG. 8B is a front view of the same, and FIG. 8C is a bottom view of the same.

9A is a sectional view taken along line XX of FIG. 8, FIG.
(B) is a sectional view taken along the line Y-Y in FIG.

FIG. 10 is a sectional view of a float.

FIG. 11 is an operation explanatory view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rice transplanter 1a Airframe 2 Engine 3 Transmission case 6 Planting work part 8 Swing case 9 Wheel 10 Axle 11 Main cylinder device 14 Balance arm 19 Sub cylinder device 20 Float 21 Hydraulic valve unit 22 Pendulum 23 Spool 24 Spool S Space

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-113812 (JP, A) JP-A-1-313912 (JP, A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A balance arm connected to a swing case of left and right traveling wheels is moved in parallel when the main cylinder is operated, and the left and right traveling wheels are moved up and down in the same direction while the sub cylinder is actuated. In a walk-behind field working machine that moves the left and right running wheels in opposite directions to control the attitude of the body, a valve unit for controlling the hydraulic operation of the main cylinder and the sub cylinder includes a spool for controlling the main cylinder and a spool for controlling the sub cylinder. And a fixed mounting portion fixedly mounted to the transmission case is provided on the upper end side of the valve unit, while the oil return of the transmission case is provided on the lower surface of the valve unit. A walk-behind field work machine characterized by projecting a return pipe that fits into the mouth and stops the valve unit .