JP2871134B2 - Arrangement structure of walking type paddy working machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement structure for a walking type rice field working machine such as a rice transplanter, a fertilizer and a seeder.

[0002]

2. Description of the Related Art In general,
In this type of walk-behind surface work machine, heavy parts such as an engine, a transmission, a working part, and a cylinder for raising and lowering wheels are mounted. It is necessary to consider balance and weight. Therefore, in the past, the engine and transmission were arranged at the front of the fuselage, and the working unit was arranged at the rear of the fuselage, and they were connected and supported by a connecting frame.However, since the rear of the fuselage is still heavy, the longitudinal balance of the aircraft is There is a need for further improvement. Furthermore, conventionally, the connection position of the connection frame is not allowed to be set at a relatively high position, and a heavy part such as the wheel lifting cylinder is mounted on the connection frame. And the running stability was poor. Furthermore, in the field work machine,
Depending on the type of work, attachments may be mounted, but in this case, there is no inconvenience that the weight center of gravity may be further increased, and depending on the mounting position, the front-rear balance of the aircraft may be adversely affected. Atsuta.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made with the object of providing an arrangement structure in a walking type paddy working machine which can eliminate these disadvantages. , While the left and right traveling wheels supported by the aircraft via the swing case are configured to be raised and lowered by hydraulic operation of the cylinder device, while the aircraft is equipped with an engine, a transmission, and a working unit, and is a walking-type field work. In the machine, the engine, transmission and cylinder device are arranged at the front part of the body and the working part is arranged at the rear part of the body and connected and supported by the body frame. A space portion is provided above the body frame in the middle part in the direction.

According to the present invention, with this configuration, the longitudinal stability of the body and the center of gravity of the body are improved, so that the running stability can be remarkably improved.

[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
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 27 and extending vertically is loosely fitted on a pin 28a projecting from an upper end of a bracket 28 supporting the front side of the float 20. That is, during non-working traveling such as traveling on the 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 detection of rolling 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, during non-work traveling, rolling control based on the tilt detection of the pendulum body 22 is performed, while during work traveling, rolling control based on the tilt detection of the float 20 is performed. 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. That is, the lower end of the valve unit 21 that is not fixed is swung by fitting a return pipe 21c projecting from the lower surface of the valve unit 21 for discharging return oil into the oil return port 3a of the transmission case 3 side. It has become so.

In the embodiment of the present invention configured as described above, the engine 2 and the transmission case 3
Is disposed at the front of the fuselage, while the planting work section 6 is disposed at the rear of the fuselage.
Since it is integrally connected and supported by the body frame 1a set at a position lower than 0, the center of gravity of the machine can be made as low as possible, and the running stability can be remarkably improved.

In addition, the main cylinder device 11 and the sub cylinder device 19 are arranged in front of the engine 2 and the transmission case 3 without being arranged on the body frame 1a in the middle of the body. Therefore, the longitudinal balance of the aircraft can also be improved.

Further, the body frame 1a in the middle part of the body
A space S is formed on the upper part, but since the space S is formed at a low position sandwiched between the left and right axles 10, the machine center of gravity becomes particularly high when the attachment is mounted. Such troubles and the front-rear balance of the body are not lost, and as a result, the running stability when the attachment is mounted can be significantly improved.

[0020]

In summary, since the present invention is constructed as described above, the engine, the transmission, the cylinder unit, the working unit and the like are mounted on the body, but the engine, the transmission, and the like. The cylinder device is disposed at the front of the fuselage, and the working unit is disposed at the rear of the fuselage. The front and rear portions of the fuselage form a space at an intermediate portion in the longitudinal direction between the axles of the left and right traveling wheels. The connection is made by a connection frame whose connection height is set low as much as possible. Therefore, it is possible to significantly reduce the weight center of gravity of the fuselage as compared with the one in which the connecting height of the connecting frame is set at a high position or the one in which the cylinder device is arranged on the connecting frame. The front-rear balance can also be improved, and as a result, the running stability can be significantly improved.

Further, since the space portion is located between the axles, which are the fulcrum of the body, it is possible to prevent a problem that the front-rear balance of the body is lost even if the attachment is mounted. Since the vehicle can be mounted on the vehicle, the center of gravity of the machine does not become very high, and the running stability when the attachment is mounted can be remarkably improved.

[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

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenichi Kondo 667 Iida-cho, Oaza, Higashiizumo-cho, Yatsuka-gun, Shimane Prefecture Inside Mitsubishi Agricultural Machinery Co., Ltd. (56) References JP-A-1-108913 (JP, A) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) A01C 11/02 315

Claims (1)

(57) [Claims] 1. The vehicle according to claim 1, wherein the right and left traveling wheels supported by the body via a swing case are configured to be moved up and down by hydraulic operation of a cylinder device. In the walking type rice field work machine, the engine, the transmission and the cylinder device are arranged at the front part of the body, and the working parts are separately arranged at the rear part of the body and connected and supported by the body frame,
An arrangement structure for a walk-behind field work machine, characterized in that a space portion is provided above a body frame in an intermediate portion in a longitudinal direction of the body sandwiched between axles of left and right running wheels.