JP2000050711A - Traveling apparatus for rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make rear wheels of rice transplanter into crawlers without causing inconvenience in which pushing in mud damages the surface of a paddy field to exert a bad influence on a planting state, a crawler drag in rotation is severe to damage a butt, the center of rotation is changed when an undulation or unevenness exists on the ground to make an operation difficult. SOLUTION: Crawler traveling apparatuses of triangular stretch structure each obtained by a winding crawler belt 13 on a front and a rear driven wheels 10 and 11 and a driving sprocket 12 are arranged at the right and left parts of the rear parts of a main body, respectively. A pair of a right and a left operating wheels 1 are installed ahead the crawler traveling apparatuses 2. Grounding length Lr in the longitudinal direction of the crawler traveling apparatuses 2 is set 1.2-1.5 diameter Df of the operating wheels 1. A shaking angle αof front rising around a support P of the crawler traveling apparatus 2 is set larger than a shaking angle β of rear rising.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling device for a rice transplanter, and more particularly, to a so-called semi-crawler type using a crawler belt type driving device having excellent traction force and less mudging instead of a driving rear wheel. The present invention relates to a rice transplanter provided with a traveling device.

[0002]

2. Description of the Related Art As a rice transplanter, Japanese Patent Laid-Open No. Hei 10-13671 is used.
As disclosed in Japanese Patent Application Publication No. 9-209, a four-wheel drive type wheel-type traveling device including a front steering wheel and a rear driving wheel is generally provided, but the traction force is improved and the sinking of the rear part of the fuselage is suppressed. ,
Alternatively, a device equipped with a crawler belt type driving device instead of the rear wheel for the purpose of improving straightness is known (for example, Japanese Patent Application Laid-Open No. 8-20367).

[0003]

However, if the rear wheel is simply made into a crawler, the long contact length of the rear wheel makes the mud push remarkable, thereby damaging the rice field and adversely affecting the planting condition. It is predicted that the headland will be roughened, and if the ground is rough or uneven, the turning center will change and it will be difficult to perform the turning operation, so it is necessary to take some measures. An object of the present invention is to provide a rice transplanter in which the rear wheel can be made into a crawler without the inconvenience.

[0004]

According to a first aspect of the present invention, in a traveling apparatus of a rice transplanter, a crawler traveling apparatus having a crawler belt wound around a driving wheel body and a driven wheel body is provided. It is equipped with a pair of left and right steering front wheels located in front of the crawler traveling device, and the front-rear length of the crawler traveling device is set to a value of 1.2 to 1.5 times the diameter of the steering front wheel. And

[0005] A second invention relates to a traveling device of a rice transplanter,
A crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body is provided on each of the right and left rear portions of the fuselage, and a pair of left and right steering front wheels is disposed in front of the crawler traveling device, and The crawler traveling device is configured to be swingable about the rotation axis of the body.

A third invention relates to a traveling device for a rice transplanter,
A crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body is provided on each of the right and left rear portions of the fuselage, and a pair of left and right steering front wheels is disposed in front of the crawler traveling device, and The driven wheel disposed on the front side of the body is configured to be slidable and maintainable in the front-rear direction.

A fourth invention is a rice transplanter traveling device,
A crawler traveling device comprising a crawler belt wound around a driving wheel body and a driven wheel body is provided on each of the right and left rear portions of the fuselage. Characterized in that the crawler traveling device is configured to be swingable around a fulcrum within a predetermined angle range, and that the front rising swing angle of the crawler traveling device is set to be larger than the rear rising swing angle. I do.

A fifth invention relates to a traveling device for a rice transplanter,
A crawler traveling device having a triangular structure in which a crawler belt is wound around front and rear driven wheels and a drive wheel disposed above the driven wheels is provided on each of the right and left rear portions of the fuselage. A pair of steering front wheels is disposed in front of the crawler traveling device, and a driving wheel is positioned on a front side of a front and rear center position between front and rear driven wheels.

According to a sixth aspect of the present invention, there is provided a traveling device for a rice transplanter,
A crawler traveling device having a triangular structure in which a crawler belt is wound around front and rear driven wheels and a drive wheel disposed above the driven wheels is provided on each of the right and left rear portions of the fuselage. A pair of front steering wheels is disposed in front of the crawler traveling device, and the height of the crawler traveling device is set to be smaller than the diameter of the front steering wheel.

[0010] A seventh invention is a rice transplanter traveling apparatus,
A crawler traveling device formed by winding a crawler belt over a driving wheel body and a driven wheel body is disposed on each of the right and left rear portions of the fuselage, and a pair of left and right steering front wheels are arranged in front of the crawler traveling device, and the driven wheels are arranged. The crawler traveling device is configured so as to be capable of swinging upward and forward about a left-right fulcrum set above the center of rotation of the body, and the maximum forward rising angle is set to 3 ° to 10 °. Features.

According to an eighth invention, in a traveling device for a rice transplanter,
A crawler traveling device formed by winding a crawler belt over a driving wheel and a driven wheel is disposed on each of the right and left rear portions of the fuselage, and a pair of left and right driving steering front wheels are arranged in front of the crawler traveling device, and the front wheels are arranged. Is slightly higher than the driving speed of the crawler traveling device.

According to a ninth invention, in a traveling device for a rice transplanter,
A crawler traveling device formed by winding a crawler belt over a driving wheel body and a driven wheel body is provided on each of the right and left rear portions of the fuselage, and a pair of left and right steering front wheels is disposed in front of the crawler traveling device, and the front wheel 5 ° to 10 ° caster angle
Is set.

According to a tenth aspect of the present invention, in a traveling device of a rice transplanter, a crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body is disposed on each of the right and left rear portions of the machine body. The front wheel is disposed in front of the crawler traveling device, and the crawler traveling device is configured to be freely switchable between a state in which the crawler traveling device can swing and a state in which the crawler traveling device is fixed so as not to swing. It is characterized by the following.

According to the first aspect of the present invention, the front-rear length of the crawler traveling device, that is, the front-rear length of a portion where an effective driving force is generated by the crawler belt is determined to be 1.2 to 1.5 times the diameter of the front steering wheel. The value is doubled, so the traction force can be increased and the contact pressure can be reduced as compared with the conventional rear wheel drive structure. It will be able to be planted well suppressed. The reason is as follows.

That is, in the current rice transplanter disclosed in the above-mentioned former publication of the four-wheel drive type, the adverse effect of pushing the rear wheel during traveling does not cause any particular problem, and the diameter of the rear wheel is substantially reduced thereafter. It is set to 1.38 times the diameter. And
In the actual planting work in the field, both the front and rear wheels run under the mud to some extent, and in wet fields, etc., they are immersed in mud near the center of the axle. Often the situation.

Therefore, based on the recognition, the longitudinal length of the crawler traveling device, which can achieve both effective traction force and a small amount of mud pushing, was obtained by a model analysis or an experiment. The front wheel diameter from 1.2 to
It turned out that setting it to 1.5 times the range was effective. As a result, it is possible to configure a preferable crawler traveling device capable of clearly increasing the traction force, improving straightness and crossing the ridge, and suppressing mud pushing to a level that does not cause a problem as compared with the conventional rear wheel drive structure. became.

According to the second aspect of the present invention, a crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body can be swingably moved about a rotation axis of the driving wheel body. With such a configuration, it is possible to swing according to the undulation and unevenness of the ground, and effective traction (driving force) can be obtained even when the road surface condition is poor.

In addition, the running stability when going over the ridge is improved. That is, the crawler tilts rearward and upward relative to the aircraft when the aircraft climbs a ridge that rises forward and tilts, and the crawler tilts upward and backward relative to the aircraft when the aircraft descends and leans forward and downward. As a result, the ground contact area is kept as large as possible compared with the case of fixed equipment, effective riding drive force and prevention of shortening of the wheel base when descending ridges are obtained, and it is stable without falling down when tilting left and right It becomes possible to cross the ridge.

According to the third aspect of the present invention, the crawler traveling device having the crawler belt wound around the driving wheel and the driven wheel is disposed on the rear side of the traveling front wheel, and disposed on the front side of the driving wheel. The driven wheel body is configured to be slidable and maintainable in the front-rear direction, so that the extension of the crawler belt due to aging can be dealt with by sliding movement of the driven wheel, and the longest wheelbase determined by the front wheel and the crawler rear end Will not change. Therefore, when the vehicle travels over the ridge, the fixed-position wheel body of the crawler traveling device serves as the ground contact point at the rear end, so that an effective driving force can be obtained in a state where the treading is effective. This is advantageous in that, as compared with the case where the vehicle is stepped on with a wheel whose position changes, the vehicle can travel stably due to less fluctuation and the crawler does not easily come off.

According to the fourth aspect of the present invention, the crawler traveling device having the crawler belt wound around the drive wheel and the driven wheel can be swung in a predetermined angle range around the left-right fulcrum. In addition, since the front swing angle of the crawler traveling device is set to be larger than the rear swing angle, the traveling stability when crossing the ridge is improved. In other words, the crawler is inclined upward and backward relative to the aircraft when climbing the ridge, but since the set swing angle is small, only the rear end of the crawler touches the ground and is stepped on. Becomes the base state and the overcoming property is improved.

When the crawler descends upwards relative to the fuselage when descending, the set swing angle is larger than the rear upward inclination angle, so that the entire contact surface of the crawler is in contact with the ground. It is maintained, and the long state of the wheel base is also maintained, so that the vehicle can run down stably. For example, if the crawler's front rise inclination angle is small, only the front end of the crawler touches down when stepping down the ridge, that is, the wheelbase becomes extremely short, and the aircraft easily swings to the left and right, or the rear part of the aircraft There is a case where the lifting height becomes high and the steering becomes unstable. However, the present invention is preferable in that such disadvantage does not occur.

According to the fifth aspect of the present invention, (a) a crawler belt is wound around a front and rear driven wheel body and a drive wheel body disposed above the driven wheel body to form a triangular structure. Since the crawler traveling device is configured, the rear transmission case or the rear axle case that supports the driving wheel body is located at a high place, and can be maintained as little as possible soaked in the mud of the field. Therefore, it is advantageous not only in the sealing property of the drive unit, but also in that the transmission cases, which are fixed objects, are not immersed in the mud and the running resistance is not increased.

In the triangulated crawler, since the drive wheel is located on the front side of the front and rear center position between the front and rear driven wheels, the front-rear distance between the drive shaft and the rear end of the crawler contact portion is long. Therefore, the rear axle case can be moved to the front side while sufficiently taking up the wheel base to make the transmission structure compact, or the wheel base can be made longer without increasing the size of the transmission structure.

According to the configuration of claim 6, in addition to having the function (a), the following function is also provided. That is, since the height of the crawler traveling device of the triangular structure is set to be smaller than the diameter of the front steering wheel, when a step is provided above the crawler, the step height is set to the height of the front step above the front wheel. It is possible to lower the height of the driver's seat and lower the height of the driver's seat than before, making it easier to replenish seedlings and maintenance of the planting part, and lowering the center of gravity at the rear of the aircraft to improve stability It is also possible to do.

According to the seventh aspect of the present invention, the crawler traveling device is configured to be able to swing forward and upward around a left-right fulcrum set above the rotation center of the driven wheel body,
Since the maximum front ascending angle is set at 3 ° to 10 °, the ridge-over performance is improved. In other words, when climbing a ridge where only the rear end of the crawler touches the ground and stepping on it, when descending the ridge, if the crawler is fixed in position, only the front end of the crawler is stepped on with a short wheel base state where the crawler touches the ground. It is preferable that the crawler is swung forward and swings and the entire crawler is in contact with the ground, rather than stable, in that the wheelbase can be long and it is difficult to tilt left and right with a large contact area.

Then, the maximum angle of the forward rise is 3 ° to 1 °.
If it is 0 °, it has been found that, while producing the above-mentioned action, it does not excessively swing in response to the ups and downs and irregularities of the ground during normal work traveling, and functions properly.

According to the eighth aspect of the present invention, the driving speed of the front wheels is slightly higher than the driving speed of the crawler traveling device disposed behind the front wheels, so that the aircraft is pulled from the front and travels slightly. As a result, the turning radius is larger than that of the crawler traveling device, and the driving speed of the front wheels is faster. Therefore, the turning can be performed more smoothly than before, and the mud pushing can be reduced.

According to the ninth aspect of the present invention, the caster angle of the front steering wheel disposed in front of the crawler traveling device is 5 °.
Since the caster angle is set to -10 °, the front wheel is slightly tilted inside the turn when turning, compared to when the caster angle is 0 °, and the front wheel turns while cutting the ground with the front wheel. Pushing is reduced.

However, due to the synergistic combination of the structure of a general steering device and the structure of providing a caster angle, in which the ground contact point of the front wheels and the steering center are shifted in the left-right direction, when the steering operation is performed, the front wheel ground point is obtained. When the caster angle becomes excessive, the steering operation becomes heavy. Therefore, it has been found that a caster angle of 5 ° to 10 ° is suitable for reducing mud pushing during turning in a range where the steering operation force is not so heavy.

According to the tenth aspect of the present invention, the crawler traveling device disposed behind the front steering wheel can be swung about a fulcrum directed left and right, and can be fixed so as not to be able to swing. Since it is configured to be able to be switched freely, it is possible to improve the running performance and the ridge crossing performance at a higher level.
That is, by switching to the swinging state, the crawler can follow the ups and downs and irregularities of the ground during the work traveling, stably maintain a strong traction force, and also suppress the change in the attitude of the body.

When riding on a ridge from a soft ground such as a wetland, the crawler may be moved to obtain an effective pushing drive force of a crawler in a large contact area, or the ridge may be lifted from a relatively dry hard rice field or the like. When riding on a vehicle, the crawler is fixed in position and a long wheelbase state (see FIG. 7) in which the crawler is depressed at the rear end thereof appears to be able to use the vehicle in a posture in which the forward rising inclination angle is suppressed. That is, it is possible to select and set whether or not the crawler traveling device swings according to the road surface condition of the traveling place.

[Effect] The traveling device of the rice transplanter according to the first aspect of the present invention employs a crawler traveling device having a front and rear length 1.2 to 1.5 times as long as the front steering wheel. As a result, it was possible to improve the running performance, which is excellent in traction force, wet field running performance, ridge crossing performance, etc., and was able to achieve a reasonable one with less mud pushing.

[0033] In the traveling device of the rice transplanter according to the second aspect,
By adopting a crawler traveling device that can swing back and forth, the state where the contact area of the crawler belt is as large as possible is maintained as much as possible, and it is possible to improve traction force and improve wetland running performance, especially driving force and running stability especially when crossing ridges Could be improved.

According to a third aspect of the present invention, there is provided a rice transplanter traveling apparatus,
Since the wheelbase determined by the front wheel and the rear end of the crawler does not change, the crawler can cope with the elongation of the crawler, making it difficult for the crawler to come off. It has improved running performance, such as excellent running performance over wetlands and wet ridges, and has been able to run stably.

[0035] In the traveling device of the rice transplanter according to the fourth aspect,
A crawler traveling device that excels in traction force, wet field running performance, crossing ridges, etc., is configured to be able to swing within a predetermined angle range around the left-right fulcrum, and to swing forward and backward and swing upward and backward. By setting the angle larger than the angle, the aircraft could easily swing right and left when going over the ridge, and the rear part of the aircraft was not lifted too high to make the steering unstable, and the running stability when going over the ridge could be improved.

[0036] In the traveling device of the rice transplanter according to the fifth aspect,
While maintaining a good condition with low sealing performance and running resistance of the drive unit, it is possible to improve running performance such as increased traction force, wet field running performance, crossing ridges, etc. compared to the conventional rear wheel mounted type, and sufficient A reasonable wheelbase and compact transmission structure can be achieved.

[0037] In the traveling device for a rice transplanter according to claim 6,
While maintaining a good condition with low sealing performance and running resistance of the drive unit, it is possible to improve running performance such as traction force increase, wet field running performance, crossing ridges, etc. compared to the conventional rear wheel mounted type, and Excellent workability due to the low height rear step and the advantage of improved stability of the rear part of the aircraft were obtained.

[0038] In the traveling device for a rice transplanter according to claim 7,
By increasing the front-up swing angle of the crawler traveling device from 3 ° to 10 °, which is excellent in tractive force increase and wet field running performance, crossing ridges, etc., it functions properly without excessive swing reaction during normal work traveling, When driving over a ridge, a strong driving force was obtained, and excellent running performance was obtained.

[0039] In the traveling device for rice transplanter according to the eighth aspect,
A preferred traveling device that is superior in traction force, wet field running performance, ridge crossing performance, etc., and is improved in straightness, smooth turning, and less mud pushing by devising to drive the front wheel slightly faster than the crawler traveling device. was gotten.

[0040] In the traveling device of the rice transplanter according to the ninth aspect,
It is excellent in traction force, wet field running performance, ridge crossing property, etc., and by setting a caster angle of 5 ° to 10 ° to the front steering wheel, mud by the front wheel during turning while keeping the steering operation force not too heavy. The push could be reduced.

According to the tenth aspect of the present invention, the traveling device of the rice transplanter is excellent in the traction force, the wet field running ability, the ridge crossing property, etc., and whether or not the crawler traveling device swings according to the road surface condition of the traveling place. As a result, it became possible to improve running performance and ridge-over performance at a higher level.

[0042]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a rice transplanter equipped with a so-called semi-crawler type traveling device including a drive steering front wheel 1 and a crawler traveling device 2 provided at a position of a conventional rear wheel. In this semi-crawler type rice transplanter, 3 is an engine, 4 is a front transmission, 5 is an operating unit, 6 is a rear transmission case (rear axle case), 7 is a planting unit, 8 is a lifting link mechanism, and 9 is a lifting cylinder. is there.

As shown in FIGS. 3 and 4, the crawler traveling device 2 disposed on each of the right and left sides of the body includes front and rear driven wheels 1
0, 11 and the front and rear centers of these driven wheels 10, 11
Further, a triangular structure in which a crawler belt 13 is wound around a driving sprocket (an example of a driving wheel body) 12 disposed above.

A track frame 15 for supporting the front and rear driven wheels 10 and 11 is pivoted on the output shaft 14 of the rear transmission case 6 to which the driving sprocket 12 is attached, about the rotation axis P of the output shaft 14. It is movably supported. The output shaft 14 coincides with the center of the rear wheel in the case of the conventional wheel drive type, so that the processing equipment for each shaft of the rear transmission can be shared. The common use of the axis of the output shaft 14 makes it relatively easy to replace the crawler traveling device 2 with the conventional rear wheel k shown by a virtual line in FIG. It is easy to respond to requests such as good specifications or good crawler specifications.

As shown in FIG. 3, the front driven wheel 10 is
There is provided a tension mechanism 16 which is slidable back and forth with respect to the track frame 15 and which adjusts and sets the amount of forward projection thereof to tension the crawler belt 13. In other words, a support pipe 22 that supports the front driven wheel 10 is fitted inside the front and rear pipes 23 of the track frame 15, and the tip of an adjuster bolt 24 screwed into the support shaft 18 of the rear driven wheel 11 in a front-rear direction. Is the support pipe 22
It comes in contact with the rear end. Therefore, lock nut 2
By operating the adjuster bolt 24 with the 5 loosened, the protrusion amount of the front driven wheel 10 can be freely adjusted and set.

The driven wheels 10 and 11 have the same structure.
4, the inner and outer circular plates 11a and 11b made of sheet metal are fitted with bearings 17 provided respectively on a support shaft 18 fixed to the track frame 15, as shown in FIG. And are relatively fixed by a plurality of bolts 19. That is, first, the inner disk 11a is fitted to the support shaft 18, then the snap ring 20 is mounted on the support shaft 18, and then the outer disk 11b is fitted to the support shaft 18, and then the bolt 19 is screwed. By doing so, assembly can be performed. In addition, a hole 11c for mud is formed in a portion corresponding to the rim bottom of the inner and outer disks 11a and 11b.
Liquid packing (not shown) is applied to the mating surfaces of the inner and outer disks 11a and 11b to ensure waterproofness of the shaft.

Instead of the single-piece drive sprocket 12 formed by general casting or forging as shown in FIG. 4, a combination structure as shown in FIGS. 9 and 10 may be used. That is,
A crawler belt made of rubber, comprising a plurality of pin shafts 12d that support pins 12c over a body 12a that is a forged part and a sheet metal receiving ring 12b that is welded and integrated with the body 12a. 13 to avoid stress concentration at the driving force transmitting portion, thereby providing durability. In this case, the mandrel 13a of the crawler belt 13 is formed in a thick and massive shape as compared with the general mandrel 12a shown in FIG. 4 so as to engage with the pin 12c.

As shown in FIGS. 2 and 3, the crawler belt 13, which moves between the strips, has a narrow width so that the influence of mud pushing or the like on the planting strips during running is hard to reach. On the outer peripheral surface, a number of basic lugs 13c are formed over the crawler width. In order to increase the driving force, as shown in FIG. 11, wide lugs 13b protruding left and right beyond the crawler width are arranged between adjacent basic lugs 13c, and both lugs 13c, 13b are arranged alternately. You may comprise so that it may be.

As shown in FIG. 3 and FIG. 5, the swing of the crawler traveling device 2 about the axis P is
5 and the front and rear stopper bolts 2 provided on the traveling body (rear transmission case 6).
6 and 27, the maximum front elevation angle α is 10 °
And the maximum swing angle β is set to 5 °. By adjusting the positions of the stopper bolts 26 and 27, the maximum swing angle in the front and rear directions can be adjusted.

As shown in FIG. 2, the left and right crawler traveling devices 2 and 2 are provided with a pair of left and right side clutches 30 and 30 housed in a rear transmission case 6 and are attached to the front wheels 1 and 1. On the other hand, a front wheel differential mechanism 31 is provided in the four front transmission cases. By appropriately using the front wheel differential mechanism 31 and the side clutches 30, 30, turning performance can be improved. 3
Numeral 8 is a seedling mounting table, and 39 is a ground float.

As shown in FIGS. 1 and 2, the track frame 15 is provided with a leveling plate 21 for holding down the mud raised by the crawler belt 13 during traveling on the field surface and leveling the ground. The surrounding mounting angle, that is, the leveling height is adjustable. Further, the front-rear length Lr of the crawler traveling device 2 is determined by the diameter Df of the front steering wheel 1.
Setting the value to 1.2 to 1.5 times that of the above is convenient for obtaining strong traction while suppressing mud pushing.

The "crawler traveling device 2"
The front-rear length of the crawler belt 13 refers to the length of a portion where an effective traction force can be generated by the crawler belt 13. In a structure in which the driving sprocket 12 is between the front and rear driven wheels 10, 11, the crawler traveling device 2 The total length corresponds to that. When the driving sprocket 12 exists before the front driven wheel body 10 or after the rear driven wheel body 11 (the structure as described in the above-mentioned publication), the crawler belt 13 is moved to the field. It is equivalent to the front and rear length of the portion that sinks into the ground and does not become the entire length of the crawler traveling device. By the way, in FIG. 1, Lr / Df is drawn as about 1.2, and the front-rear length Lr of the crawler traveling device 2 is set to a value slightly smaller than the diameter of the conventional rear wheel k, so that mud pushing is effectively performed. It is convenient to suppress it.

As shown in FIG. 1, since the height of the crawler traveling device 2 is smaller than the diameter of the front wheel 1, the height of the rear step 32 formed above the crawler traveling device 2 is
The height of the front step (round step) 33 formed above the front wheel 1 is lower than that of the front step. Accordingly, the seating height of the driver's seat 35 can be reduced as compared with the conventional rear-wheel rice transplanter.

[Another Embodiment] As shown in FIG. 8, a triangular crawler traveling device 2 having a driving sprocket 12 located forward of a front and rear center position between front and rear driven wheels 10 and 11 is provided. Is also good. In this structure, if the wheel base W for the rear driven wheel body 11 is the same as that of the present embodiment, the position of the rear transmission case 6 shifts toward the front side, and the transmission system such as the transmission shaft 34 from the front transmission case 4. If the position of the rear transmission case 6 is the same as that of the present embodiment, the wheel base W can be made longer, and running stability can be improved. There is.

When the crawler traveling device 2 swings, the wheel base W is the longitudinal distance between the rotation axis of the front wheel 1 and the swing fulcrum P (the rotation axis of the driving sprocket 12). When the position of the traveling device 2 is fixed, the distance is the longitudinal distance between the rotation axis of the front wheel 1 and the rotation axis of the rear driven wheel body 11 on the rear side. In FIG. 8, for the sake of comparison, the rear driven wheel 11
Is defined as the wheel base W.

As shown in FIG. 1, 5 ° to 10 °
May be added. If the caster angle γ is present, as shown in FIG. 2, the front wheel 1 is not only steered, but also an element that falls down inside the turn is added during turning, so that the vehicle turns while cutting the soil of the field sharply. Therefore, the mud pushing by 1 can be reduced.

As shown in FIG. 6, a hydraulic cylinder 36 may be provided between the stay 29 fixed to the rear transmission case 6 and the track frame 15, and the crawler traveling device 2 may be driven to swing around the fulcrum P. . The control valve 37 of the hydraulic cylinder 36 has a rear ascending position u, a front ascending position d,
It is configured as a four-position type having a neutral lock position n and a free swing position f. If the free swing position f is set, a free swing state that follows ups and downs and irregularities on the ground can be obtained.

When the control valve 37 is operated to the neutral lock position n to fix the crawler traveling device 2 in a state where the contact surface thereof is parallel to the body (the swing angle is 0 °), as shown in FIG. In addition, the crawler traveling device 2 can be set to the long wheel base W state in which the forward rising angle of the body is suppressed when riding on the ridge. Also, the crawler traveling device 2 is intentionally
Can be freely fixed in a state of swinging forward or backward.

The front-rear swing angle of the crawler traveling device 2 may be set to 3 ° to 10 ° only for the forward rising angle, and the rearward rising angle may be prevented.

[Brief description of the drawings]

FIG. 1 is a side view of a semi-crawler rice transplanter.

FIG. 2 is a schematic plan view showing a traveling and steering system.

FIG. 3 is a side view showing the crawler traveling device.

FIG. 4 is a sectional view showing the structure of a crawler traveling device.

FIG. 5 is a side view showing the maximum swing angle of the crawler traveling device in the forward and backward directions.

FIG. 6 is a partially cutaway side view showing a drive swing structure of the crawler traveling device.

FIG. 7 is a side view showing a state in which the ridge rides.

FIG. 8 is a side view of a rice transplanter having a crawler traveling device in which a driving sprocket is located forward.

FIG. 9 is a sectional rear view showing another structure of the drive sprocket.

FIG. 10 is a partially cutaway side view of the sprocket shown in FIG. 9;

FIG. 11 is a plan view showing a lug structure of a crawler belt.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 drive steering front wheel 2 crawler traveling device 10, 11 driven wheel body 12 driving wheel body 13 crawler belt Lr front-to-rear contact length of crawler belt Df diameter of front wheel P rotation axis α forward rising swing angle of crawler traveling device β Backward swing angle of crawler traveling device γ Caster angle

Continued on the front page (72) Inventor Tsuyoshi Inoue 64, Ishizukita-cho, Sakai City, Osaka, Japan Inside Kubota Sakai Works (72) Inventor Takeo Kubota 64, Ishizukita-machi, Sakai City, Osaka Prefecture, Kubota Sakai Works 72) Inventor Mikio Okuyama 64 Ishizu-Kitamachi, Sakai City, Osaka Prefecture F-term in Kubota Sakai Works Co., Ltd. (Reference) 2B063 AA02 BA01 BA30 BB02

Claims (10)

[Claims] 1. A crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body is provided on each of right and left rear portions of a fuselage, and a pair of left and right steering front wheels is provided in front of the crawler traveling device. A rice transplanter traveling device, wherein the traveling length of the crawler traveling device is set to a value of 1.2 to 1.5 times the diameter of the front steering wheel. 2. A crawler traveling device comprising a crawler belt wound around a driving wheel body and a driven wheel body is disposed on each of the right and left rear portions of the fuselage, and a pair of left and right steering front wheels is provided in front of the crawler traveling device. A traveling device for a rice transplanter, wherein the traveling device is arranged and configured to be able to swing the crawler traveling device about a rotation axis of the drive wheel body. 3. A crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body is provided on each of the right and left rear portions of the fuselage, and a pair of left and right steering front wheels is provided in front of the crawler traveling device. A traveling device for a rice transplanter, wherein the traveling device is disposed so as to be slidable and maintainable in the front-rear direction with respect to the driven wheel disposed in front of the drive wheel. 4. A crawler traveling device comprising a crawler belt wound around a driving wheel body and a driven wheel body is disposed on each of the right and left rear portions of the fuselage, and a pair of left and right steered front wheels is provided in front of the crawler traveling device. The crawler traveling device is configured so as to be swingable around a fulcrum in the left-right direction within a predetermined angle range, and the front rising swing angle of the crawler traveling device is set to be larger than the rear rising swing angle. The traveling equipment of the rice transplanter that has been set. 5. A crawler traveling device having a triangular structure in which a crawler belt is wound around front and rear driven wheels and a drive wheel disposed above the driven wheels, respectively, at right and left rear portions of the body. Traveling of a rice transplanter having a pair of left and right steered front wheels disposed in front of the crawler traveling device, and the drive wheel positioned forward of a front-rear center position between the front and rear driven wheels. apparatus. 6. A crawler traveling device having a triangular structure in which a crawler belt is wound around front and rear driven wheels and a drive wheel disposed above the driven wheels, respectively, at right and left rear portions of the body. And a pair of left and right steering front wheels disposed in front of the crawler traveling device, and a height of the crawler traveling device is set to be smaller than a diameter of the front steering wheel. 7. A crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body is provided on each of the right and left rear portions of the fuselage, and a pair of left and right steering front wheels is provided in front of the crawler traveling device. And the crawler traveling device is configured to be able to swing upward and forward about a left-right fulcrum set above the rotation center of the driven wheel body, and has a maximum forward rising angle of 3 ° to 10 °. A rice transplanter traveling device set to °. 8. A crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body is provided on each of the right and left rear portions of the fuselage, and a pair of left and right driving steer front wheels is provided in front of the crawler traveling device. And the driving speed of the front wheels is slightly higher than the driving speed of the crawler traveling device. 9. A crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body is provided on each of the right and left rear portions of the fuselage, and a pair of left and right steering front wheels is provided in front of the crawler traveling device. A rice transplanter traveling device, wherein the caster angle of the front wheels is set to 5 ° to 10 °. 10. A crawler traveling device having a crawler belt wound around a driving wheel body and a driven wheel body is disposed on each of the right and left rear portions of the fuselage, and a pair of left and right steering front wheels is provided in front of the crawler traveling device. A traveling device for a rice transplanter, wherein the traveling device is arranged so as to be freely switchable between a state in which the crawler traveling device can swing about a fulcrum in the left-right direction and a state in which the crawler traveling device is fixed so as not to swing.