JP2546755Y2 - Balance arm structure for walking type rice field work machine - Google Patents

Description

[Detailed description of the invention]

[0001]

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

[0002]

2. Description of the Related Art
In this type of walk-behind field work machine, the left and right traveling wheels are moved up and down in the same direction by moving the balance arms connected to the swing case of the left and right traveling wheels in parallel by operating the cylinder, thereby controlling the vertical movement of the body. Some are configured to perform Conventionally, however, the cylinders are arranged sideways so that the operation direction is in the front-rear direction. Therefore, when the cylinders are arranged in consideration of the front-rear balance of the body, the entire length of the body must be particularly extended. Inconvenience occurs. Therefore, it is conceivable that the cylinder can be arranged vertically, and this can be arranged at the front part of the fuselage. However, in this case, the balance arm moves in the vertical direction, When the upper part of the installation space is covered with a bonnet, it is necessary to take care that the balance arm does not interfere with the bonnet at the upper limit position, particularly when the bonnet is tapered forward. However, there arises a disadvantage that the width of the bonnet must be particularly widened without securing the width.

[0003]

SUMMARY OF THE INVENTION The present invention has been conceived in view of the above-mentioned circumstances, and has as its object to provide a balance arm structure in a walking type field working machine capable of eliminating these disadvantages. In a walking type paddle working machine in which the balance arms respectively connected to the swing case sides of the left and right running wheels are moved in parallel by the operation of the cylinder to move the left and right running wheels up and down in the same direction, the cylinder is moved forward. Vertically placed in the front space of the fuselage whose upper part is covered with a tapered bonnet as narrow as possible, while connecting the swing case side connecting positions of the left and right ends of the balance arm with respect to the cylinder connecting position of the central part of the balance arm. It is characterized by being biased to.

According to the present invention, a bonnet covering the space for disposing the cylinder can be formed as narrow as possible.

[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, which is loosely fitted on the lower end 2a and formed on the lower end side in the vertical direction, has a predetermined dead zone width with a pin 28a protruding from the upper end of a bracket 28 supporting the front side of the float 20. It is loose fit. At the time of non-work traveling such as traveling on a road, the float 20 is connected to the rear horizontal
Swinging to the lower limit with
a is disengaged from the slit 27b, whereby the link 27 is disconnected from the bracket 28 to allow free swinging of the pendulum body 22, but during work traveling, the float 20 swings upward due to the sliding surface on the rice field surface. The pin 2
8a fits into the slit 27b, whereby the link 2
7 is connected to the bracket 28 to restrain sensitive 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. 22 is forcibly swung from side to side. That is, during non-operation traveling, rolling control is always performed based on the detection of the inclination of the pendulum body 22, while during operation traveling, the aircraft body is inclined with respect to the rice field surface due to unevenness of the cultivator, etc. When the tilt 20 is inclined with respect to the fuselage, the bracket 28 is tilted with respect to the fuselage. When the tilt exceeds the dead zone, the link 27 forcibly swings the pendulum 22 while restraining the pendulum 22. Accordingly, the rolling control based on the inclination detection of the float 20 is performed, and when the aircraft is inclined along the rice field surface, that is, when the float 20 and the aircraft are in a horizontal state, the bracket 28 is placed in a vertical posture with respect to the aircraft. In this state, the link 27 restrains the swing of the pendulum 22 so as to maintain the aircraft in a horizontal attitude with respect to the rice field surface. 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, the balance arm 1 in which the left and right ends 14b are connected to the left and right swing cases 8 via the connection rods 17, respectively.
In the operation of the main cylinder device 11, the body is moved up and down by performing parallel movement, and in the operation of the sub-cylinder device 19, the body is controlled by rolling. The rod connecting position of both ends 14b is deviated rearward from the cylinder connecting position of the intermediate portion 14a. 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 in order to narrow the width of the bonnet 18. Since there is a limit in the arrangement of the engine 2 and the like, only the left and right end portions 14b, which are the connection positions of the connection rod 17, are deviated rearward from the cylinder connection position of the intermediate portion 14a. Therefore, the tapered bonnet 18 covering the upper part of the balance arm 14 can be formed as narrow as possible, and as a result, the size and weight of the body can be greatly reduced.

Moreover, in the balance arm 14 of the embodiment, the upper sides of the left and right end portions 14b are formed to be inclined such that the lower the outer sides, the narrower the width of the upper end is than the width of the lower end. Therefore, when viewed from the front, the upper surface can be compactly accommodated in the bonnet 18 whose upper surface is formed in the central bulge, and the height of the bonnet 18 can be reduced as much as possible. Can be measured.

Further, the swing range of the balance arm 14 is regulated by the balance arm 14 being in contact with the upper end of the cylinder cylinder 11b at the upper and lower limits of the swing range. Since no members are required, the number of parts can be reduced and the structure can be simplified.

[0020]

In summary, since the present invention is constructed as described above, the balance arms connected to the swing case sides of the left and right traveling wheels are respectively raised by tapered bonnets which are narrower toward the front. While the balance arm controls the attitude of the fuselage by performing parallel movement by the operation of a cylinder vertically disposed in the front space of the fuselage, the balance arm has a swing case side connecting position at both the left and right ends. The arm is formed so as to be deviated rearward with respect to the cylinder connecting position at the center of the arm. In other words, when the balance arm is covered with a tapered bonnet, the bonnet can be made smaller by arranging the balance arm position at the rear, but there is a limit to the rear arrangement of the balance arm. Only the left and right ends, which are positions, are deviated rearward with respect to the cylinder connecting position at the intermediate portion, so that the size of the bonnet can be reduced. As a result, is it possible to reduce the size of the fuselage with the downsizing of the bonnet?
It can also contribute to the weight reduction of the fuselage.

[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 8b Swing arm 9 Wheel 10 Axle 11 Main cylinder device 14 Balance arm 19 Sub cylinder device 20 Float 21 Hydraulic valve unit 22 Pendulum body 23 Spool 24 Spool S space

Claims (1)

(57) [Scope of request for utility model registration] 1. A walking type paddle working machine wherein a balance arm connected to a swing case side of left and right traveling wheels is moved in parallel by operation of a cylinder to move left and right traveling wheels up and down in the same direction. Is placed vertically in the front space of the fuselage, whose upper part is covered by a tapered bonnet that is narrower toward the front, while the swing case side connection positions at the left and right ends of the balance arm are moved to the cylinder connection position at the center of the balance arm. A balance arm structure in a walking type rice field working machine, wherein the balance arm is biased rearward.