JP2001197812A - Support structure for side float - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support structure for side floats having resolved such problems that, in a conventional side float support structure, the whole construction becomes larger because members necessary for support are disposed in front of the side floats, and furthermore, there are many parts for supporting the side floats, resulting in complicated assembly process. SOLUTION: This side float support structure has such a scheme that side floats 98 and 99 are supported on a support arm 162 extended backwardly downward from a support shaft 161, a coil spring 271 is latched on the support arm 162 so as to keep the side floats 98 and 99 horizontal, and the tip of the support arm 162 is provided with a stopper (162a) for checking the upward/ downward turning of the side floats 98 and 99.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice transplanting machine, and more particularly, to a rice transplanting machine for a rice transplanter. The present invention relates to a side float support structure.

[0002]

2. Description of the Related Art Conventionally, in a planting section of a riding rice transplanter,
A plurality of floats are arranged below the planted part so that the planted part does not sink when working while traveling in the paddy field,
The center float is used to detect the planting depth, and the side floats arranged on both the left and right sides set the planting depth. It was suspended by an arm, and its front part was supported by a coil spring. Then, the lowering direction of the side float is regulated by the float arm.

[0003]

However, in the conventional side float support structure, the members required to support the front part must be arranged at the front part of the side float, so that the front part of the side float is required. Requires a certain amount of space, the lateral feed mechanism of the seedling table must be placed above and forward of it, and this has the problem of increasing the overall configuration.The number of parts for supporting the side float is also limited. In many cases, the assembling process is complicated, and therefore, it is a component that needs improvement in a riding rice transplanter whose weight and cost are to be reduced.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, the side float support arm disposed below the planting portion of the rice transplanter extends rearward and downward from the fulcrum shaft connected to the planting depth setting lever, and the side float is supported at the rear end of the support arm. The support arm is provided with a side float raising / lowering rotation restricting stopper at a distal end thereof.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below based on examples shown in the drawings. FIG. 1 is a schematic side view showing an entire riding rice transplanter A according to the present invention, and FIG. 2 is a plan view of the same. The riding rice transplanter A includes a traveling vehicle 1 and a traveling vehicle 1
As shown in FIG. 1, a front wheel 2 and a rear wheel 3 are suspended at a front portion and a rear portion of the traveling vehicle 1, respectively. Is equipped with an engine 5 as a power unit. The engine 5
A transmission case 6 elongated in the front-rear direction is disposed substantially at the center of the rear body frame 4 on the left and right sides. The front wheel 2 is supported at the front of the transmission case 6, and the rear wheel 3 is supported at the rear. . Bonnet 22 covering engine 5
Spare seedling mounts 90 are arranged on both sides of the vehicle, and the transmission case 6 and the like are covered by a vehicle body cover 20 on which an operator rides. A driver's seat 7 is provided at the rear upper portion of the vehicle body cover 20, and a hood 22 at a front portion of the vehicle body cover 20 is provided.
A steering handle 8 is disposed behind the steering wheel.

[0006] The planting section 9 comprises a seedling table 91 having a four-row planting, a plurality of planting claws 93, and the like. 96
The planting transmission frame 92 is supported by the planting transmission frame 92 so as to be able to slide back and forth in the left and right directions. Therefore, the front wheel 2 and the rear wheel 3 are driven and moved, and the seedling mounting table 91 is slidable right and left.
, One seedling is taken out by the planting claw 93 and the seedling planting operation can be continuously performed.

A hitch 94 is provided at the front of the planting transmission frame 92 via a rolling fulcrum shaft 176. The hitch 94 is composed of the top link 11 pivotally supported on the upper left and right sides of the hitch 94, and the hitch 94. Is connected to the rear of the traveling vehicle 1 via a lifting link mechanism 10 including a lower link 12 pivotally supported on both left and right sides of the lower part of the traveling vehicle 1. A lift arm 13 is provided on the inner surface of the front end of the lower link 12.
The lift arm 13 projects upward in a direction substantially perpendicular to the direction in which the lower link 12 is provided. An elevating cylinder 15 for driving the elevating link mechanism 10 to elevate and lower is connected to a lift arm 13 connected to the lower link 12.

A reinforcing link 14 is connected between the upper end of the lift arm 13 and the rear end of the lower link 12 to increase the rigidity of the lower link 12. The top link 11 and the lower link 12
Is pivotally supported via a pivot pin provided between the rear connecting frames 43 and 44 described later. The rear connecting frames 43 and 44 are also used as support portions of the lifting link mechanism 10. The stabilization of the planting section 9 is stabilized, the number of parts is reduced, and the configuration is simplified. A parallel link for raising and lowering the planting section 9 is formed by the lifting link mechanism 10, so that the planting posture of the planted seedlings does not change even when the planting section 9 is raised and lowered according to the unevenness of the field.

A main transmission lever 75, a seedling connecting lever 76, a planting elevating lever 77, a main clutch pedal 74, a brake pedal 73, and the like are disposed on the vehicle body cover 20 on which the driver's seat 7 and the like are installed. At the lower part of the section 9, a center float 97 for leveling and side floats 98/99 for holding the planting section 9 at a constant height are arranged. The center float 97 is disposed on the left and right center lines of the traveling vehicle 1,
Side floats 98 and 99 are disposed at symmetrical positions of the center float 97, so that the right and left balance of the planting portion 9 is maintained, the planting posture is stabilized, and planting can be performed accurately.

Next, the configuration of each section will be described in detail. First, the mounting configuration of the spare seedling mounting table will be described. FIG. 3 is an overall plan view when the spare seedling mounting table is attached to the inside of the body, and FIG. 4 is a small riding rice transplanter when the spare seedling table on the right side in the traveling direction is attached to face the inside of the machine. FIG. 5 is a schematic side view of a vehicle body frame and a transmission case, FIG. 6 is a plan view of the same, and FIG. 76 is a front view of a spare seedling mounting table that can be mounted inside the fuselage.

The body frame 4 is formed of a pipe body, and as shown in plan view in FIGS. 6 and 10, both sides are bent toward the rear of the body to form an expanded substantially U-shaped front frame 40. When the transmission case 6 is disposed, the rear of the transmission case 6 near the front end is parallel to the transmission case 6 and the front of the transmission case 6 near the front end is expanded in a substantially C-shape. And a pair of left and right side frames 41 and 42. Then, the front ends of the side frames 41 and 42 that are expanded in a C shape are connected to the open-side rear portions of the front frame 40, and further, as shown in FIG. 5, the rear portions of the side frames 41 and 42 face upward. It is bent.

A stay 29 bent in an L-shape in plan view is fixed between both side ends of the front frame 40 and outer front ends of the side frames 41 and 42.
A holding portion 28 in the shape of a square pipe is fixed to the outside of the support 9, and the column 90 a of the spare seedling mounting table 90 is fitted and fixed to the holding portion 28. The spare seedling mounting table 90 holds the holding unit 2 as described later.
By removing the support 90a from 8, the direction can be changed by 180 degrees. In addition, since the front sides of the side frames 41 and 42 are widened in a C-shape, a wide engine space can be secured. Since it is parallel to the case 6, the installation space for the rear wheel 3, various operation levers, and the like can be secured, and the method of fixing and connecting these can be simplified.

As shown in FIG. 5, a flat support member 50 extends downward from the center of the front frame 40 toward the lower rear in a side view.
Is mounted on the support member 50. The front portion of the support member 50 is formed to be curved upward toward the front frame 40, and the rear end portion of the engine support member 50 is supported by a connection frame 45 connecting the side frames 41 and 42. An opening 50a is formed near the connecting portion.

An opening 50 formed in the support member 50
a and 50b are designed to reduce the weight of the entire body and to promote the heat radiation effect of the engine 5, and may be used as an insertion hole for an engine drain, maintenance, etc. It can also be used when doing Further, since the support member 50 has a flat plate shape, it can be used as a protective cover at the lower portion of the engine 5, and can reduce the number of parts and weight as compared with a case where a separate protective cover is provided. It can be reduced, and costs can be reduced. In addition, since the mounting height of the engine 5 can be set at a lower position than the above, the center of gravity of the entire body can be lowered as compared with the conventional arrangement on a frame, and the rice transplanter having an excellent fall angle can be obtained. Can be realized.

Next, the spare seedling mounting table 90 will be described.
As shown in FIGS. 1 to 6, holding portions 28 are provided at both end portions of the front frame 40 through the stays 29 so as to fit the columns 90 a of the spare seedling mounting table 90. The lower end of the support 90a is fitted into the support 90a, and the knob screw 350 is inserted from the front of the holding portion 28, so that the support 90a,
The spare seedling mounting table 90 is fixed.

Since the spare seedling mounting table 90 is symmetrical, only one side will be described. A support frame 351 formed by bending a pipe into a U-shape in plan view is provided above the support 90a.
351 are fixedly provided in two upper and lower stages, and the support frame 351 is provided.
・ Placement plate 3 as a placement part for placing seedling box on 351
52 and 352 are fixed. Openings 352a, 352a at the rear of the mounting plates 352, 352 are for lifting and removing the seedling box from below.

As shown in FIGS. 1, 2 and 4, slide plates 353 and 353 are provided on the lower surfaces of the mounting plates 352 and 352 as separate mounting portions. The sliding plate 353 is formed integrally with a sliding grip frame 353a, and the sliding grip frame 353a is slidably supported on the support frames 351. The rear part of the grip frame 353a for slide is extended below the rear part of the mounting plate 352, and when the user grips the rear part of the grip frame 353a for slide and pushes forward, the slide plate 353 slides forward and is placed on the slide plate 353. A long seedling mat and a seedling box can be placed on the placement portion enlarged by the plate 352.

Also, side frames 354, 35 for receiving the seedling boxes are provided on the sides of the support frames 351, 351, respectively.
4 is fixed, and a receiving plate 355 is fixed in the center of the lower side frame 354. The tray (empty box) and the seedling mat removal plate can be stored.

When the riding rice transplanter A is stored in a barn or the like, it cannot be removed conventionally. The column 90a can be lifted upward and removed, and the riding rice transplanter A can be stored with the spare seedling mounting table 90 removed. Therefore, the width of the riding rice transplanter A can be reduced, and the rice transplanter A can be stored compactly.

When the rice transplanter A is stored in a barn or the like, a support 90a is conventionally used for storing the spare seedling mounting table 90.
Although the configuration was not such that the spare seedling mounting table 90 of FIG. 2 was turned to the outside of the fuselage, as shown in FIG. The support 90a is rotated by 180 degrees so as to face the inside of the fuselage, and the support 90a is fitted into the holder 28.
, The spare seedling mounting table 90 can be fixed if the knob screw 350 is inserted from the front of the device and stored with the spare seedling mounting table 90 attached to the body. The removed spare seedling mounting table 90 can be compactly attached to the fuselage side without being configured to be stored separately from the machine in the barn, and can be efficiently stored in a storage place such as a barn. There is no burden of separately storing the mounting table 90.

At this time, as shown by a two-dot chain line in FIG. 3 and FIG. 76, the spare seedling mounting table 90 can be accommodated within the left and right widths of the body, so that it is compact without taking up width. It becomes possible to be in a stored state. Compared with the conventional configuration in which the spare seedling mounting table is rotated rearward, the structure is simpler and the number of parts can be reduced. It will be possible to manufacture it.

As shown in FIGS. 3 and 4, when the spare seedling mounting table 90 is attached to the inside of the machine body, the side frame 354 and the seedling mat mounting portion of the spare seedling mounting table 90 in plan view. When a certain mounting plate 352 is overlapped with the sub-step 23, the width of the rice transplanter A can be reduced, and when stored in a barn or the like, it can be stored compactly without taking up the width. is there. Conventionally, since the engine 5 is arranged on the frame and the bonnet position is high, even when the spare seedling mounting table 90 is rotated inward, the spare seedling mounting table 90 is prevented from interfering with the bonnet 22.
It was necessary to dispose the mounting part of the aircraft at the side of the fuselage, and it was not possible to store it very compactly. In the present embodiment, as described above, the engine 5 built in the hood 22
Is disposed so as to protrude downward from the body frame 4 and the position of the engine 5 is lowered, so that when the spare seedling mounting table 90 is mounted so as to face the inside of the fuselage, the bonnet 22 Side frame 3 on the lower side of spare seedling mounting table 90
54 and the mounting plate 352, there is no interference, it can be configured to overlap with the hood 22 in a plan view, and the lateral width of the body can be narrowed to achieve a compact storage state. It can be stored in a storage place such as a barn without taking up too much space, and more aircraft can be loaded on a carrier of a transport vehicle such as a trailer at the time of shipment from a factory. Further, since the height of the bonnet 22 is reduced, the mounting portion of the spare seedling mounting table 90 can be arranged at a low position, and the visibility of the operator is improved, and the handling of the seedling mat and the seedling box is facilitated.

As shown in FIG. 3, the spare seedling mounting table 90 can be stored in front of the traveling operation tools such as the main shift lever 75 and the seedling splicing lever 76. Compared to the configuration in which the traveling operation tool overlaps, even in a state where the spare seedling mounting table 90 is installed facing the inside of the aircraft, the aircraft can be easily operated in a storage place such as a barn or on the road, The operability is not impaired.

Next, the bonnet 22, sub-step 2
3. The configuration of the main step 32 will be described. 7 is a perspective view of a state where a bonnet is removed, FIG. 8 is a perspective view of a state where a bonnet and a fuel tank are disassembled, FIG. 9 is a side view of a front part of a rice transplanter, FIG. 11 is a plan view of a rear cover, FIG. 12 is a plan view of a front cover, FIG. 13 is a perspective view of a non-slip member, FIG. 14 is a front view thereof, FIG. 15 is a side view of an engine and an engine cover part, and FIG. FIG. 77 is a partial sectional view of the same plan view, and FIG. 77 is a perspective view of a state in which a bonnet and a fuel tank of another embodiment are disassembled.

The main step 32 and the front cover 21
On the upper surface of the sub-step 23, as shown in FIGS.
A large number of them are formed integrally with the sub-steps 2 and the sub-steps 23, and are protruded in a grid pattern. Conventionally, the anti-slip member is formed on a rubber sheet, and the rubber sheet is attached to a step or the like, which increases the number of parts. In the present embodiment, the non-slip member 35 is integrally formed with the main step 32 and the sub-step 23 to reduce the number of parts. As shown in FIGS. 13 and 14, the shape of the non-slip member 35 is integrally formed such that the central portion is made higher in the shape of a roof of a gabled house, and is inclined downward as it goes outward. However, this shape is not limited, and may be a shape such as a triangular pyramid or a quadrangular pyramid. Accordingly, since mud, water, and the like flow on the step surface without accumulating on the non-slip member 35, the slip preventing effect can be constantly maintained.

Therefore, unlike the prior art, there is no need to separately use a step cushion or the like, so that the number of parts can be reduced, and the cost and the number of production steps can be reduced. In addition, by making the non-slip member 35 in such a shape, the anti-slip effect is enhanced, and the safety at the time of getting on and off in front of the fuselage and transferring the seedling mat from the preliminary seedling mounting table 90 to the seedling mounting table 91 is reduced. Can be maintained. And especially, the non-slip member 35
Are arranged in a grid, the drainage and drainage effect is high,
Mud clogging between the non-slip members 35 can be prevented.

As shown in FIGS. 5, 6, and 15,
A flat support member 50 is provided from the center of the front frame 40 toward the rear lower side, and the engine 5 is mounted on the support member 50. The engine 5
, An output shaft 52 protrudes laterally, and a drive pulley 53 is integrally mounted on the output shaft 52. The driven pulley 53 of the transmission case 6 is
And a drive pulley 53 for transmitting power to
A pump belt 281 for transmitting power to a pump pulley 282 disposed in front of the pump pulley 282 is hung. 15 and 16, the belt 54, the pump belt 281, the driving pulley 53, and the pump pulley 28
2 is integrally mounted. The belt cover 283 is configured to cover at least the side surface, the lower surface, and the front surface of the belt and the pulleys to be protected.
a · 283a... are provided.

By adopting such a structure, safety is improved, and despite being disposed near the engine 5, an escape path for hot air is ensured. The heat balance of the five main bodies is improved. Further, since the belt cover 283 is made of resin and is of a fitting type, one-touch attachment / detachment is possible and maintenance is excellent.

Although the upper part of the engine 5 is covered by a hood 22 as an engine cover, the lower part of the engine 5 projects below the body frame 4 as shown in FIG. In the case of, the cooling air intake 5a near the recoil starter is exposed from below the body frame 4, and further, the exhaust port of the muffler 5b, which becomes relatively hot on the opposite side of the cooling air intake 5a, is directed outward. Since the cooling air is not disposed, there is no intake resistance of the cooling air, so that the suction loss is reduced and the temperature of the cooling air can be reduced. Further, since heat can be radiated from the portion where the engine 5 is exposed, the heat balance of the engine 5 is improved, and the output does not decrease. Therefore, a rice transplanter having an excellent heat balance can be realized.

The fuel tank 136 is supported and attached to a stay 137 fixed to the engine 5 as shown in FIG.
As shown in the figure, the tank support portion 137a of the stay 137 is protruded so as to be located above the bonnet 22. It is attached and fixed by fixing means such as.

With this configuration, the support member for the fuel tank such as the stay can be simplified, and the number of parts can be reduced. Further, since the fuel tank 136 can be easily removed, the maintenance property is excellent.

Further, since the fuel tank 136 is placed above the engine 5, it is necessary to protect the fuel tank 136 from heat radiation of the engine 5. Therefore, as shown in FIGS. 7 and 8, the bonnet 22 of the present invention is configured such that the upper surface of the bonnet 22 where the fuel tank 136 is located is formed in a concave shape to form a shielding concave portion 22b. Alternatively, the fuel tank 136 may be inserted between the fuel tanks 136 and fitted to the bottom of the fuel tank 136. By providing the heat-insulating member with the heat-shielding recess 22b,
Conventionally, in order to protect the fuel tank 136, the heat balance of the fuel tank 136 can be adjusted by the bonnet 22 without requiring the attached heat shielding member.
The cost can be reduced by reducing the number of parts. In addition, the reduction in the number of parts simplifies the assembly process and improves the maintainability. However, a configuration in which the fuel tank 136 mounting portion on the upper surface of the bonnet 22 is cut out and opened, and a shielding member is attached to that portion is also possible.

The shielding recess 22 b on the upper surface of the bonnet 22 is formed in accordance with the shape of the lower part of the fuel tank 136. The lower part of the fuel tank 136 has a convex part 136 projecting downward in a shape substantially along the outer periphery of the tank.
b is formed. A concave portion 22c on the upper surface of the hood 22 is formed according to the shape of the convex portion 136b. The rear of the recess 22c is opened, and the bonnet 22 is inserted from the front of the vehicle body, and can be attached and detached by a simple operation.
, And can prevent lateral displacement. In addition, since the rear side of the concave portion 22c is open, the concave portion 22c is formed.
The structure is such that dust such as water and mud does not accumulate in c.

In FIGS. 8, 9 and 12, on the upper surface of the bonnet 22, at positions not overlapping with the fuel tank 136 in plan view, heat radiating holes 22a for radiating heat of the engine 5 are provided. Are drilled at a plurality of locations.
The heat radiation holes 22a are located at positions not overlapping with the fuel tank 136 in plan view, and
In this embodiment, it is formed on the front part of the bonnet 22, but may be formed on the side part. By opening the heat radiating holes 22a, it is possible to effectively radiate heat so as to maintain the heat balance of the engine 5, and to protect the fuel tank 136 from high-temperature heat due to heat radiation of the engine 5. You can do it.

Next, another embodiment in which the bonnet 22 is detachable will be described. As shown in FIG. 77, similarly to the above, the protruding portion 13 projecting downward at the lower portion of the fuel tank 136 is provided.
6b are formed. A rib 22d is formed on the upper surface of the bonnet 22 in a U-shape in plan view so as to match the shape of the projection 136b. It is a member. Then, the rear of the rib 22d is opened, the bonnet 22 is inserted from the front of the vehicle body, and can be attached and detached with a simple operation. As in the case of forming the concave portion 22c, the lateral displacement can be prevented, and the configuration is such that dust such as water and mud does not accumulate when the rear portion of the rib 22d is opened.

As shown in FIGS. 8 and 10, a U-shaped groove-shaped recess 136 is provided at the rear of the fuel tank 136.
9c so that the front surface of the steer link shaft 81 can be inserted into the recess 136c.
As shown in the figure, a ring-shaped stopper member 280 is fixed to the upper and lower portions of the steering shaft 81. By fitting the steer link shaft 81 into the recess 136c of the fuel tank 136 in this manner, the upward movement is regulated by the stopper member 280. Further, the structure can be simplified and the weight can be reduced. The stopper 280 also plays a role in positioning the fuel tank 136 when the fuel tank 136 is mounted.

Next, the arrangement of various operation levers and the steering handle will be described. FIG. 17 is a schematic perspective view showing the positional relationship between the steering handle and various operation levers of the present invention, and FIG. 18 is a schematic plan view showing various operation levers and an oil meter as viewed from the driver's seat through the steering handle. FIG. 19 is a schematic plan view showing various operation levers and an oil meter as viewed from a driver's seat through a steering handle, FIG. 20 is a schematic side view of a fuel tank provided with an oil meter, and FIG. FIG. 22 is a schematic perspective view showing a steering handle provided with a straight portion in a part of the outer periphery.

As shown in FIGS. 9, 17 and 18, the various levers are arranged on the steering column 150 of the steering handle 8 located at the center of the body, that is, the steering shaft 8
1 are arranged substantially symmetrically on the left and right sides of the lower part of the vehicle 1. A traveling operation unit, which will be described later, is concentrated on the left side in plan view toward the front of the fuselage, and an engine operation unit, which will be described later, is concentrated on the right side. Note that the planting operation section is centrally arranged on the right side of the driver's seat 7. When the levers for operating the respective functions are concentrated and arranged at different positions in the respective operation systems, the respective operations are easy to understand, and the handling is improved, which is preferable. In the illustrated embodiment, the traveling operation system is disposed on the left and the engine operation system is disposed on the right, but they may be reversed.

This will be described more specifically. First, a lever guide portion 150a that is substantially horizontal when viewed from the side is formed in a portion where the traveling operation portion is provided, and a main transmission lever 75 and a seedling connecting lever 76, which are levers as traveling operation portions, are moved in the front-rear direction. The main shift lever 75 is arranged on the inside of the machine, and the seedling connecting lever 76 is arranged on the outside of the machine.

As described above, when the lever guide portion 150a in which the main transmission lever 75 and the seedling connecting lever 76 are disposed is substantially horizontal when viewed from the side, the lever guide portion 150a is tilted upright. In the case of the same position position, for example, in the case of the main speed change lever 75, the lever sectional area parallel to the lever guide surface at the neutral position is reduced, so that the position position of each lever can be clearly understood. If the frequently used main shift lever 75 is disposed closer to the driver's seat 7, there is an advantage that the shift operation can be easily performed. If the seedling connecting lever 76 is disposed outside, There is an advantage that operation becomes easy when the user gets off the aircraft and performs work. In other words, a brake mechanism and a clutch function, which will be described later, can be performed, entry and exit to and from a field and loading and unloading to and from a transport vehicle can be easily performed, and the seedling connecting lever 76 can be operated while getting down from the aircraft and viewing the planting position. Therefore, planting can be performed just before the ridge crossing, and it is not necessary to perform hand planting at the end.

On the other hand, an operation panel 150b is formed at a portion where the engine operation section is provided, and is directed to the driver's seat 7 side.
2. A grip portion 153a of the recoil starter 153 is provided, and a grip portion of the accelerator lever 78 is provided above the grip portion 153a. Further, since the operation panel on which the engine operation unit is provided is provided in a substantially vertical direction, the distance between the operator and the engine operation unit is reduced. Therefore, it is very easy to perform these operations mainly by sitting in the driver's seat, and furthermore, they are arranged in the order of the operation force from the inside of the body and in the operation order from the inside of the body. The arrangement is easy to understand, the operability is greatly improved, and the workability is greatly improved. Further, since each operating tool is provided at a position close to the engine 5, the interlocking connection from each operating tool to the engine 5 can be simplified.

At the diagonally upper right end of the operation panel 150b, as shown in FIG.
01 is arranged. That is, since the seedling warning buzzer stopping means 201 is installed near the side surface opposite to the traveling operation lever with the steering handle 8 interposed therebetween, even if the seedling warning buzzer suddenly starts to sound, the main bearing alarm buzzer stops. The seedling connection alarm buzzer stop means 201 is pushed without touching the shift lever 75, the seedling connection lever 76, etc., so that the seedling connection alarm buzzer can be stopped immediately.
In other words, the operability is excellent because it is not hindered by the travel operation lever, and an accident due to an erroneous operation can be prevented before it occurs. Further, since the seedling splicing alarm buzzer stopping means 201 is located outside and above other switches such as the key switch 151 and the choke 152 disposed on the operation panel 150b, it can be operated without interference. It also has a configuration.

Next, the positional relationship between the various operation levers and the steering handle 8 will be described. First, the steering handle 8
As shown in FIGS. 17 to 19, three spokes 200 extend radially from the upper end of a steering shaft 81 projecting upward from the center of the fuselage.
The inside of a ring-shaped grip portion 210 is fixedly supported at the tip of 00 to form a steering handle 8. Further, a steering column 150 disposed in the middle of the steering shaft 81 in the vertical direction has a lever guide portion 150 on which a traveling operation system lever is disposed on the left side in the body traveling direction.
a is formed, and an operation panel 150b on which an engine operation system lever is arranged is formed on the right side.
A fuel tank 136 is provided.

The three spokes 200 arranged in a Y-shape when the steering handle 8 is oriented straight ahead.
Are the rear spokes 200a and the left diagonally forward spokes 200
b, three space portions 209 are disposed so as to be the diagonally forward right spokes 200 c and the grip portion 210.
a, 209b, and 209c. With this arrangement and the operator seated, the operator can check the key switch 151, the choke 152, the seedling alarm buzzer stopping means 201 and the operation panel 150b through the space 209b.
c, the main transmission lever 75, the seedling connecting lever 76, and the lever guide 150a thereof can be confirmed.
It is configured so that it can be checked while sitting in the driver's seat 7 without being obstructed, so that it is not necessary to move the field of view from the front to the side, and the planting strip is bent and it is not possible to plant it neatly Therefore, erroneous operation can be prevented and safety can be improved.

Further, the fuel tank 136 can be confirmed through the space 209a. The fuel tank 136 is provided with residual oil amount confirming means 202. 20, as shown in FIG. 21, a permeation type oil meter 202a and a float type oil meter 202
b. The transmission type oil meter 202a
Is provided with a transparent portion 203 in a part of the fuel tank 136, and a scale 204 is cut in the transparent portion 203 so that the oil level can be seen through from outside so that the amount of oil can be checked. The float type oil meter 202b has a display unit 205 and a surveying unit 206, and the amount of oil can be confirmed on the display unit 205.

That is, since the residual oil amount can be confirmed during operation through the space 209a, the operation can be continued without worrying about running out of fuel.
The number and shape of the spokes 200 are not limited, and the grip portion 210 of the steering handle 8 can be reliably supported and fixed. Anything that can be confirmed while sitting in the room is acceptable.

Next, another embodiment of the steering handle 8 will be described. In FIG. 22, the steering handle 207 is in a straight running state, and the rear portion is a left and right straight portion 207b.
It is fixed to the upper end of. An arc-shaped grip portion 207a centering on the steering shaft 81 is formed from both sides of the straight portion 207b forward as in the related art. With this configuration, compared to the conventional circular handle,
Normally, the steering wheel is oriented in the straight traveling direction, so that the distance between the straight portion 207b and the driver's seat 7 increases. That is,
When moving around on the main step 33, such as when connecting seedlings or getting on and off, the feet in front of the driver's seat 7 are widened. Further, the structure of the steering handle 207 can be simplified, the cost can be reduced, and there is no handle behind the straight portion 207b, so that the position of the lever or switch can be easily confirmed.

As shown in FIG. 1, the transmission case 6 has a body lower than the center in the front-rear direction of the body frame 4 formed at a low front and rear height so that the rear part is separated from the lower surface of the main step 32. It is formed long in the front-rear direction projected to the rear lower part of the rear end of the frame 4, and as shown in FIG. Therefore, above the rear part of the transmission case 6,
The PTO transmission shaft 158, the lifting cylinder 15 for raising and lowering the planting section 9, and the effective space where various operation levers can be arranged can be secured, the overall length of the machine can be shortened, and the layout is simple without waste. The configuration can be adopted, and the degree of freedom in design can be improved.

As shown in FIGS. 5, 6, 23 and 24, the side frames 41 constituting the body frame 4 are provided.
42 is formed so that the rear side is bent upward from the substantially central portion 41a / 42a in the front-rear direction, and the center frame 46 is erected in the body width direction near the central portion 41a / 42a where the bending starts. . An attachment member 47 provided substantially at the center of the center frame 46 in the body width direction.
The middle part of the transmission case 6 is connected to the transmission. The middle part of the transmission case 6 is located immediately above the PTO shaft 65 projecting rearward.
Upper ends of rear connecting frames 43 and 44 connected via a mounting plate 39 to a rear axle case 38 integrally provided at the rear of the transmission case 6 and rear ends of the side frames 41 and 42 Are integrally connected, and the side frames 41 and 42, the rear connecting frames 43 and 44, and the transmission case 6 constitute a substantially triangular frame in side view.

The rear frame 48 has a body width at the portion where the rear ends of the side frames 41 and 42 are connected to the upper ends of the rear connecting frames 43 and 44, that is, the uppermost vertex forming a substantially triangular shape. The rear lower surface of the driver seat installation portion 31 of the rear cover 30 is placed and fixed on the rear frame 48 and the rear support member 72.
The load on the driver's seat 7 is supported via the. In addition, the center portions 41a and 42a of the side frames 41 and 42 and the rear end portions 41
b and 42b, a front lower surface of the installation portion 31 is placed and fixed on a support member 49 such as a pipe stay which is erected in the machine width direction and erected in the width direction of the fuselage. Are connected to each other.

The rear portion of the driver's seat 7 is arranged just above the apex portion of the frame having the substantially triangular shape as described above, and the center portions 41a and 42a of the body frame 4 and the rear portion of the body frame 4 Rear connecting frame 43 supporting the end
When the transmission case 6 is configured to support the rear lower end portion of the transmission 44, most of the vertical load applied to the driver's seat 7 can be firmly supported by the top portion and the transmission case 6. The body frame 4
This does not require the rigidity of the body itself, so that the weight of the body frame 4 can be reduced and the number of parts can be reduced. The front portion of the driver's seat 7 is also supported by the support member 49 erected on the body frame 4 instead of being supported by the rear cover 30 as in the related art. Does not occur. Further, by configuring the body frame 4 to have a triangular shape in a side view, it is possible to effectively use a space in an inner side portion thereof, and it is possible to reduce the size of the entire body.

As described above, the side frame 4
A mounting member 47 for connecting the middle part of the transmission case 6 is provided at substantially the center in plan view of the reinforcing center frame 46 erected in the width direction of the body 1 and 42. Is connected to the base of a hydraulic lifting cylinder 15 that raises and lowers the planting section 9.

As described above, the rigidity and strength of the body frame 4 in the horizontal, vertical and torsion directions can be improved only by connecting the front, rear and center of the transmission case 6 to the body frame 4. Can be. The transmission case 6 is an effective strength-reinforcing member of the rice transplanter together with the vehicle body frame 4 despite the small mounting position.

Next, the mission case 6 will be described. FIG. 23 is a schematic side view of a lifting link mechanism, and FIG.
FIG. 25 is a partial cross-sectional view of the right side view of the transmission case, FIG. 25 is a flat development cross-sectional view of the transmission case, FIG.
7 is a left side view of the transmission case, FIG. 28 is a plane development sectional view showing another embodiment of transmission of the transmission case, FIG. 29 is a side sectional view showing another embodiment of the lower portion of the transmission case, and FIG. 31 is an overall side view of a rice transplanter having an embodiment, FIG. 31 is a cross-sectional plan view showing a detachable structure of a cover for inter-variable transmission at the front side of a transmission case, and FIG. 33 is a side view showing a configuration of an oil supply pipe arranged at the front of the transmission case, FIG. 34 is a side view showing a power connection / disconnection operation configuration for the transmission case, and FIG. 35 is a plan view showing a power connection / disconnection operation configuration for the transmission case. It is a figure partial sectional view.

The internal mechanism of the transmission case 6 will be described with reference to FIGS. A transmission chamber 60 in which a traveling transmission mechanism is provided is formed at the front of the transmission case 6, and a front axle case 37 is integrally fixed to both left and right sides of the transmission chamber 60. An axle case is fixed downward from the left and right ends of the front axle case 37, and a front wheel shaft 66 for fixing the front wheel 2 is supported at the lower end of the axle case. At the rear end of the transmission case 6, a cylindrical rear axle case 38 having an axis in the left-right direction is integrally formed.
A rear wheel drive shaft 69 is rotatably supported therein. The rear wheel 3 is fixed to both left and right end portions of the rear wheel drive shaft 69, and a transmission case, a transmission case, a rear axle case, and the like as in the related art are eliminated.

As described above, the front axle case 37
If the transmission case 6 and the rear axle case 38 are provided integrally with each other, the transmission case 6 can support the wheels 2 and 3 and can serve as a part of the frame as the body strength reinforcing member as described above. Therefore, the burden on the body frame 4 can be reduced. A plurality of ribs 6f are formed on the inner surface of the transmission case 6 to increase the section modulus, and the transmission case 6 is a rigid case.

As described above, the transmission mechanism and the PTO shaft 6 are internally provided at the front portion of the transmission case 6 which is bulged in the vertical direction.
A transmission chamber 60 in which the transmission gear 5 is disposed is formed, and a PTO shaft 65 having an axial center in the front-rear direction is supported at an upper rear portion of the transmission chamber 60 bulging upward. In this manner, the transmission case 6 has a rear side one step lower than the rear part of the transmission chamber 60, that is, the upper rear part of the transmission chamber 60 has the transmission case 6.
The rear end of the PTO shaft 65 protrudes rearward from the rear surface of the swelled transmission chamber 60. Further, since the rear portion of the transmission case 6 is arranged obliquely downward as described above, the PTO transmission shaft 158 having the universal joint portion 159 connected to the PTO shaft 65 is provided.
A large space can be taken for the passage, and the universal joint portion 159, the PTO transmission shaft 158, and the like can be arranged with a margin. And even when raising and lowering the planting part 9, they do not interfere,
The power of the PTO shaft 65 can be transmitted to the planting section 9 stably.

An input shaft 56 is supported on the upper part of the transmission chamber 60 of the transmission case 6 in the left-right direction. As shown in FIG. 16, the left end of the input shaft 56 projects outward, and a driven pulley 55 is provided. A drive pulley 53 fixedly mounted on the output shaft 52 protruding laterally from the left side surface of the engine 5.
From the transmission case 6 via the belt 54
Is entered in The belt 54 is configured to be tensioned by a tension roller 58 attached to the tip of a tension arm 57, and the power is cut off in conjunction with the depression operation of the main clutch pedal 74 and the shift operation of the seedling connecting lever 76. Contact is made. Further, a belt 54 wound around a driving pulley 53 on the engine 5 side and a driven pulley 56 on the transmission case 6 side, and the transmission case 6 are disposed substantially linearly. A power transmission path for transmitting power has a space-saving and efficient arrangement.

As shown in FIGS. 24 to 26, the input shaft 5
A main transmission shaft 61 is supported below the front of the main transmission shaft 6.
A front wheel drive shaft 62 is pivotally supported below the front of the vehicle.
Is transmitted substantially downward and forward. The front wheel shaft 66 of the front wheel 2 is
And a power transmission path for transmitting the power of the input shaft 56 linearly downward in the vertical direction. For this reason, the power transmission path can be shortened, a simple configuration with less power loss can be achieved, and the length of the axle case in the vertical direction can be shortened, so that the cost can be reduced.

The main transmission shaft 61 is provided in front of the input shaft 56.
The auxiliary transmission shaft 63 is supported above the shaft.
The main transmission shaft 61 and the main transmission shaft 61 are arranged in a substantially isosceles triangular shape having the sub transmission shaft 63 as a vertex in a side view, and the configuration inside the transmission case 6 is simple. Also, rear wheel 3
The driving force to the rear wheel drive shaft 69 for driving the
The transmission is transmitted from the main transmission shaft 61 between the front wheel drive shaft 62 and the rear axle drive unit below the rear of the transmission case 6 via the chain 70, and is a front high rear low direction in which the transmission case 6 is disposed. A power transmission path.

That is, a driven shaft 67, a counter shaft 68, and a rear wheel drive shaft 69 are disposed in the rear axle drive portion at the rear of the transmission case 6 in the rear downward direction along the direction in which the transmission case 6 is disposed. The chain 70 is transmitted to the driven shaft 67, the power is transmitted to the rear wheel drive shaft 69 via the counter shaft 68, and the drive transmission path to the rear wheel drive shaft 69 is set in the direction in which the transmission case 6 is disposed. The power transmission path is simple, space-saving, and efficient in the form of a power transmission path.

Further, since this power transmission path is the shortest path, the length of the chain 70 can be shortened and the cost can be reduced. Because it will be lower than 4,
The diameter of the rear wheel 3 can be reduced, and the size of the traveling vehicle can be reduced.

Although the chain 70 is used as a structure for transmitting power to the rear axle drive unit, the structure for transmitting power is not limited to an endless body such as the chain 70. As shown in FIG.
24 can also be used. In this case, the main transmission shaft 6
1 and a bevel gear 325 is fixed on the
Power is transmitted to the front portion of the transmission shaft 324 via the transmission shaft 32.
The rear portion 4 and the driven shaft 67 are linked to each other via bevel gears 327 and 328.

In the configuration using the transmission shaft 324, a guide member for applying tension to the chain is provided at the center of the transmission case 6 without generating abnormal noise such as chain noise as compared with the configuration using the chain 70. Since it is not necessary to dispose the transmission shaft 324, the degree of freedom in designing the central portion can be improved. Further, the transmission shaft 324 itself can have rigidity, and the central portion of the transmission case 6 can be made thinner. Accordingly, the turning angle of the front wheel 2, which is the steered wheel, can be increased, the turning performance can be improved, and the weight can be reduced by narrowing the central portion of the transmission case 6 in the vertical direction.

Further, as shown in FIG. 29, the counter shaft 68 is arranged at a position higher than the rear wheel drive shaft 69, and the lowermost height of the outer peripheral surface of the inner gear 104 and the gear 10
The lowermost part of the transmission case 6 is prevented from being lowered by the inner gear 104 which is a large-diameter gear, and the lowermost part of the gear 10
6 and the height above the ground is raised so that straw debris and the like do not get caught, so that the ridge can be passed over smoothly. Further, as shown in FIG. 30, by making the shape of the lower rear portion of the transmission case 6 substantially the same as the elevating locus of the center float 97 described later,
It is configured to shorten the overall length.

Further, a power connecting / disconnecting mechanism and a braking mechanism are provided at a rear axle driving portion at a rear portion of the transmission case 6. The sprocket 100 is fixed on the outer peripheral surface of the boss 101 and the chain 70 is wound. A sliding gear 102 is spline-fitted to the driven shafts 67 on both left and right sides of the boss 101, and the sliding gear 10
2 and the side clutch 103 are integrally formed with the same number of teeth, so that the number of parts can be reduced and assembly is facilitated. An inner gear 104 pivotally supported by the counter shaft 68 is engaged with the sliding gear 102, and a gear 106 fixed to the rear wheel drive shaft 69 is engaged with an outer gear 105 formed integrally with the inner gear 104. .

A fork fixed to an operation shaft 107 pivotally supported on the upper surface of the transmission case 6 is fitted to the sliding gear 102, and an arm 108 fixed to the upper portion of the operation shaft 107 is rotated to operate. The operation shaft 107 rotates, and the sliding gear 102 slides. When the sliding gear 102 is slid inward, the inside of the sliding gear 102 is engaged in the boss 101 to transmit power, and the rear wheel drive shaft 69 is driven. When the sliding gear 102 is slid outward, the boss 101 is disengaged from the sliding gear 102, and the transmission of power is released, and at the same time, a pad formed at the outer end of the sliding gear 102 is formed. And the brake mechanism 130 constituted by the holding body is operated, the rotation of the sliding gear 102 is braked, and the rear wheel drive shaft 6
9 is stopped.

On the other hand, as shown in FIG. 26, a PTO input shaft 64 is supported
Power is transmitted from the input shaft 64 to a transmission shaft 65b having a shaft center in the front-rear direction via bevel gears 64a and 65a,
The power is transmitted to the PTO shaft 65 via the O-clutch 109, the power is transmitted rearward in the horizontal direction from the input shaft 56, and the power is transmitted to the rear planting portion 9. A gear-type clutch is used as the PTO clutch 109 for connecting and disconnecting power to and from the PTO shaft 65. A cylindrical body 65c is loosely fitted to the transmission shaft 65b at the center in the front-rear direction, and the cylindrical body 65c is loosely fitted. A clutch gear 110 is fixed to a front portion of the transmission shaft 65b that is not fitted, and a sliding clutch gear 111 is spline-fitted to a front portion of the cylindrical body 65c.

The sliding clutch gear 111 is fitted with a fork fixed to an operation shaft 112 which is supported by the side of the transmission case 6, and the operation shaft 112 is disposed at a position near the driver's seat 7. Is linked to the planting elevating lever 77 which also serves as the
Is operated, the clutch gear 110 and the sliding clutch gear 111 are meshed, and the power of the transmission shaft 65b is transmitted to the rear PTO shaft 65. In addition,
A sliding clutch gear 113 of a gear-type clutch is slidably and spline-fitted to the rear portion of the cylinder 65c.
4, the PTO shaft 65 is urged in a direction in which it meshes with the clutch gear 115 fixed to the front portion of the PTO shaft 65.
Is formed with a safety clutch 116 for transmitting power to the vehicle. The safety clutch 116 releases power transmission on the transmission case 6 side when a load is applied to the power transmission mechanism on the planting section 9 side, so that the configuration of the planting section 9 is simplified. ing.

A reverse gear 117 is provided around the input shaft 56, and a first transmission gear 118 for traveling is mounted on the auxiliary transmission shaft 63.
And a second transmission gear 119 are fixedly provided. The power to the PTO shaft 65 is transmitted via a speed change mechanism in which the power of the input shaft 56 is shifted between stocks, and the conventional planting transmission case is eliminated. That is, a first reduction gear 121 that performs inter-stock shift is fixed detachably on the side of the reverse gear 117 circulated around the end of the input shaft 56.
A second reduction gear 122 that protrudes laterally from the side surface of the transmission case 6 and performs a stock-to-stock shift is also detachably fixed to an end of the TO input shaft 64, and the second reduction gear 122 and the first reduction gear 121 By intermeshing, the inter-stock shift is performed, and PT
The power to the O-shaft 65 is transmitted.

The PTO input shaft 64 is connected to the input shaft 56.
, The second reduction gear 122 and the first reduction gear 121 are located above the transmission case 6, and perform the inter-stock shift.
The side surface 2 is detachably covered with a cover 123, and the position of the cover 123 is upward as shown in FIG. The first reduction gear 1 can be easily removed by removing the cover 123.
21 and the second reduction gear 122 can be interchanged, so that the inter-stock shift can be performed according to the specifications. By arranging the transmission mechanism of the planting section 9 in the transmission case in this way, the structure of the planting section 9 can be made simpler.

In this embodiment, the cover 123 is
It is of a fitting type on the side of the transmission case 6 and is configured to be easily mounted. That is, as shown in FIG. 31, a step 320 is formed on the side surface of the transmission case 6 according to the outer peripheral shape of the cover 123, and the outer peripheral portion that is the side surface of the cover 123 can be easily fitted and fitted. The cover 123 can be integrated with the transmission case 6.

Further, a hole 123a is opened in the cover 123, and a wing bolt 321 is inserted into the hole 123a and screwed to the side surface of the transmission case 6 to securely fix the cover 123 to the transmission case. The step 3
Thus, the first reduction gear 121 and the second reduction gear 122 incorporated therein can be completely sealed. Further, convex portions 123b and 123c are provided on the inner surface of the cover 123 so that the reduction gear 121
122 functional cover 1
There are 23 configurations. As shown in FIG. 27, the mounting position of the wing bolt 321 is outside the front wheel 2 and below the side frame 41, so that the wing bolt 321 can be easily removed from the side of the fuselage. , Cover 1
23 is removed so that the internal first reduction gear 121 and second reduction gear 122 can be easily exchanged, thereby improving maintainability.

As shown in FIG. 26, a main transmission shaft 61 disposed in front of and below the input shaft 56 is spline-fitted with a traveling transmission gear 124 slidable in the axial direction. Reference numeral 124 denotes a gear that integrally fixes the large-diameter gear 125 and the small-diameter gear 126 in the lateral direction, and is fitted to a fork 329 that slides in the left-right direction in conjunction with the operation of the main transmission lever 75. ing. Main transmission shaft 6
On the left side of the transmission case 1 in the front-rear direction, a power split gear 127 in which a sprocket and a gear are integrated is fixedly mounted. The power split gear 127 has left and right front wheels as shown in FIGS. The ring gear 305 of the differential device 128 for driving the drive shaft 62 meshes with the power split gear 1.
27 is used to split power in two directions.

When the main transmission lever 75 is rotated forward from the neutral position, the traveling transmission gear 124 is slid to the left in the front-rear direction of the transmission case via the shift fork 329, and the small-diameter gear 126 and the auxiliary transmission shaft 63 are moved. By engaging the upper second transmission gear 119 and rotating the main transmission shaft 61 at high speed, normal traveling is performed in which the wheels 2 and 3 are rotated at high speed. When the main transmission lever 75 is rotated one step backward from the neutral position, the traveling transmission gear 124 is slid to the right in the front-rear direction of the transmission case, and the large-diameter gear 125 and the first transmission gear on the auxiliary transmission shaft 63 are moved. The main transmission shaft 61 is rotated at a low speed to drive the wheels 2 and 3 at the working speed, and a two-stage shift is performed on the forward side.

When the main transmission lever 75 is rotated backward, the traveling transmission gear 124 is further slid to the right in the front-rear direction of the transmission case, and the reverse gear 11 on the input shaft 56 is moved.
7 meshes with a gear on the main transmission shaft 61, the main transmission shaft 61 is rotated in the reverse direction, and the wheels 2 and 3 are rotated backward.
As described above, the input shaft 56 is used as a counter shaft having a reverse gear, and the transmission mechanism in the transmission case is configured as a simple transmission mechanism without the PTO counter shaft, which is the input shaft to the PTO side. Also, it is possible to perform a minimum necessary traveling shift such as normal traveling, work traveling, and reverse traveling.

A differential lock mechanism 129 is arranged on the side of the differential device 128. That is, a lock gear 305a is formed at a side end of the ring gear 305 of the differential gear 128, and the lock body 30 which is spline-engaged with the gear 305a on the front wheel drive shaft 62.
The meshing teeth 306a on the six side surfaces can be engaged. The lock body 306 is urged outward by a spring 304,
The front wheel drive shaft 62 is urged to contact the stepped portion. In this position, the gear 305a of the ring gear 305
And the engagement teeth 306a on the side surface of the lock body 306 are not engaged with each other.
62 is differentiated.

A groove 306b is formed outside the outer peripheral surface of the lock body 306, and the upper part of the lock operation pin 307 pivotally supported on the lower surface of the transmission case 6 is engaged. The upper part of the lock operation pin 307 forms a contact part 307a on one side in a semicircular shape, and a concave part 307b on the opposite side. Lock operation pin 30 protruding below the lower surface of the transmission case 6
Arms 308 and 309 are provided on the left and right at a lower portion of the arm 7. With the arms 308 and 309 turned left and right, the concave portion 307b above the lock operation pin 307 is
The lock body 306 is located in the groove 306 b of the reference numeral 06 and is in a non-engagement position with respect to the ring gear 305. Then, the arm 309 is rotated in conjunction with the differential lock operation lever 349 shown in FIG.
When the lock operation pin 307 is rotated by a predetermined angle or more in accordance with a steering operation of the steering handle 8 described later, the lock operation pin 307 is rotated in any direction, and the contact portion 307a is rotated.
The lock body 306 is pushed by using the
5a is engaged. By this engagement, the ring gear 3
05 is engaged with the front wheel drive shaft 62 via the lock body 306, that is, the so-called differential device 128 is locked,
The left and right front wheel drive shafts 62 are not differentially driven.

In the transmission case 6 having such a transmission mechanism, as shown in FIGS. 24 and 25,
A suction pipe 157 for sucking lubricating oil toward the hydraulic lifting cylinder 15 is disposed on the rear side surface of the transmission case 6, and a return oil pipe 156 for returning oil into the transmission case 6 is provided in front of the transmission case 6. The transmission case 6 is also provided above the transmission chamber 60, and the transmission case 6 is also used as a tank for lubricating oil.

The lubricating oil returned from the hydraulic lifting cylinder 15 via the return oil pipe 156 is fed into the upper portion of the transmission chamber 60 to lubricate the transmission gears in this portion, and the speed change in the transmission chamber 60 is performed. It is not necessary to increase the level of the lubricating oil in the transmission case 6 until the gears and the like are immersed, so that it is possible to reduce the amount of lubricating oil, reduce costs and realize weight reduction.

The suction pipe 157 is communicated with a cylindrical suction filter 330 disposed immediately in front of the operation shaft 107. The suction pipe 1
The communication position of the 57 with the transmission case 6 (the arrangement of the suction filter 330) is as far as possible
9, which is disposed immediately in front of the operation shaft 107, which can be provided at a low place of the transmission case 6, and can store lubricating oil in a region from a lower portion of the transmission case 6 to an upper middle portion of the transmission case 6. This results in the formation of a tank. Then, the lubricating oil at the lower part of the transmission case 6 is supplied through the suction filter 330 to the suction pipe 157.
The lubricating oil from which chips or chips that have been chipped or scraped off by the meshing of the transmission gears in the transmission case 6 are removed is fed into the hydraulic lifting cylinder 15.

Further, the suction pipe 157 is attached to the rear side of the transmission case 6 so that the longitudinal distance between the suction pipe 157 and the return oil pipe 156 increases, and the suction pipe 157 is heated from the side of the transmission case 6 while circulating from the front to the rear of the transmission case 6. The heat of the lubricating oil can be dissipated, improving the cooling efficiency. Further, when the return oil pipe 156 and the suction pipe 157 are disposed to face each other with the chain 70 interposed therebetween, the high-temperature oil returned from the suction pipe 157 into the transmission case 6 is stirred by driving the chain 70. Thus, cooling can be sufficiently performed while convection in the transmission case 6 occurs, and the temperature of oil in the transmission case 6 can be made substantially uniform.

The bottom of the transmission case 6 is formed in a streamlined shape having a circular arc portion 6g in a side view, and the resistance does not increase even when the transmission case is run while being immersed in the water in the field during the planting operation. The water flows smoothly. When the bottom of the transmission case 6 is immersed in water, the heat radiation performance of this portion is improved, and the transmission case 6 is formed long before and after to increase the heat radiation area. After cooling, the lubricating oil that has been completely cooled is supplied to the suction pipe 15 below the transmission case 6.
7, the oil can be fed to a working machine such as a hydraulic lifting cylinder 15, and the driving performance of the hydraulic pulse driving type hydraulic lifting cylinder 15 can be kept high. Can be moved up and down with certainty.

As shown in FIG. 33, an oil supply pipe 331 is connected to one side of the front upper part of the transmission case 6, and the oil supply pipe 331 is extended toward the engine 5 at the front upper side. 331 upper side frame 41
It is bent upward and rearward above 42 so as to project toward the driver's seat 7 side. A breather 332 is provided at an upper portion of the oil supply pipe 331 so that even if the lubricating oil inside the transmission case 6 expands due to heat, the inside air is discharged. The upper portion of the oil supply pipe 331 is covered by the steering column 150, and is configured to shut off the smell of the lubricating oil so as not to flow into the driver's seat 7 side to maintain a good working environment. And the steering column 15
The lubricating oil can be replenished from the oil supply pipe 331 by removing 0 with a single touch, and this operation can be performed from the driver's seat 7 side, resulting in excellent workability.

As shown in FIG. 5, a through-hole 133 for passing a brake shaft 132 for operating left and right brake rods 131 is provided on the inner side of the lower front end of the transmission case 6, that is, below the transmission chamber 60. The transmission case 6 supports the brake mechanism. Therefore, there is no need to separately provide a support member, and the space at that portion can be designed to be compact. Further, in the present embodiment, the opening position of the through hole 133 is arranged at the lower front part of the transmission case 6, but the brake rod 131 connected to the brake shaft 132 passes through the side of the transmission case 6 as described later. Thus, the configuration of the lower front portion of the transmission case 6 is simplified, and there is no possibility that straw, grass, or the like will be scratched or mud will adhere to this portion and cause corrosion.

As the brake mechanism, two brake pedals are used.
A two-brake mechanism is used as shown in FIGS.
As shown by the left and right brake pedals 73a
When either one of the brake shafts 73b is depressed, the brake shaft 132 formed of a double cylinder is interlocked therewith.
The left and right brake rods 1 are connected to each of the cylinders.
31 operate separately, and brake rod 1
31 The arm 108 interlockingly connected to the rear end rotates, the sliding gear 102 slides outward to release the power transmission, and at the same time, the brake mechanism 130 is actuated to perform the stepping operation. The rear wheel drive shaft 69 is braked, and only the other rear wheel drive shaft 69 is driven to turn the traveling vehicle 1 sharply. When both brakes are to be applied at the same time, for example, when traveling on a road, a connecting tool 135 for connecting the left and right brake pedals 73 is used.

Conventionally, as shown in FIG. 36, an arm 10 for operating the braking of the rear wheel drive shafts 69 is provided.
8 and 108 are arranged below the rear of the transmission case 6, and the arms 108 and 108 and the brake shaft 132
The brake rod 131 is arranged below the mission case 6 serving as a bottom during the planting operation, so that mud and the like are easily attached and straw chips and grass are easily entangled. The arrangement was such that the brake rod 131 was struck and easily damaged.

In this embodiment, the rear wheel drive shaft 6
Arms 108 and 108 for operating the brakes 9 and 69 are arranged above the rear portion of the transmission case 6, and the arms 108 and
The outer end of the transmission case 108 projects outward from the left and right side surfaces of the transmission case 6, and a brake rod 131 for interlocking with the brake shaft 132 is connected to the transmission case 6 by passing through the left and right sides. Therefore, below the transmission case 6, which is the bottom of the work, the arms 108 and 108 and the brake rods 131 and 13 which are operation interlocking parts are provided.
Since it is not configured to dispose 1 and the like, as described above, there is no sticking of mud and the like, no troubles such as straw chips and grass being caught, and no hitting even when crossing a ridge. is there.

Next, the steering drive will be described. FIG. 37 is a side view of a lower portion of the steering shaft, and FIG. 38 is a plan view showing an interlocking configuration of a steering operation and a differential lock mechanism. As shown in FIGS. 9, 37, and 38, a steering shaft 81 of the steering wheel 8 is disposed behind the engine 5 and in front of the transmission case 6.
The steering shaft 81 is formed in a straight shape. The steering drive unit 80 provided at the lower end of the steering shaft 81 is provided so as to be located below the engine 5, and overlaps the engine 5 in a side view and a plan view.

As shown in FIG. 9, the front upper surface 6e of the transmission case 6 is inclined at the same angle as that of the straight steering shaft 81 in a side view, that is, so as to be substantially parallel to the steering shaft 81. The transmission case 6 and the steering shaft 81 can be prevented from interfering with each other.

As described above, if the engine 5 and the transmission case 6 are arranged side by side in the front-rear direction, and the straight steering shaft 81 can be arranged between them, a joint such as a conventional steering gear case can be provided. There is no need to provide a part, and the number of parts can be reduced. Therefore, simplification and space saving of the mission case 6 can be realized, and the space in that portion can be effectively used. Also, the steering drive unit 80
Overlaps with the engine 5 in a plan view, the overall length of the fuselage can be shortened and the space below the engine 5 can be used effectively, so that the degree of freedom in the design of the steering drive unit 80 can be improved. Can be improved. Further, since the engine 5 is disposed so as to protrude below the body frame 4, the steering drive unit 80 is also disposed on the lower side. A rice transplanter can be realized.
In addition, when entering or exiting a field or the like, especially when the vehicle is moving backward, the swollen front lower portion of the transmission case 6 serves as a mudguard to prevent mud from adhering to the steering drive unit 80 as much as possible.

The steering gear 82 of the steering drive unit 80 meshes with a gear 83 provided at the lower end of the steering shaft 81 of the steering handle 8, and is turned by the turning operation of the steering handle 8. The front wheel 2 is configured to rotate around a shaft 84 and change the direction of the front wheel 2 by operating a pair of left and right steering rods 85 connected to both front portions of a steering gear 82. In addition,
An opening 82a long in the left-right direction into which the operation shaft 86 is inserted is formed substantially in the center of the steering gear 82,
The rotation range of the steering gear 82 is regulated by the operation shaft 86.

As shown in FIG. 37, the unit of the steering gear 82 includes bolts 208, 208,.
Is attached to the attachment member 51 from below by
There is no need for a space for a fastening tool above the mounting member 51, so that assembly and disassembly can be performed easily, and the mounting height of the engine 5 can be further reduced to reduce the center of gravity. It is configured.

The operation of the differential lock mechanism 129 is performed by a differential lock operation lever 349 on the right side of the driver's seat 7 as shown in FIG. When the front wheel 2 slips into the mud in the field during work,
By performing an operation of lifting the differential lock operation lever 349 upward, the arm 30 is moved in conjunction with this operation.
9, the differential device 128 is locked as described above, the left and right front wheel drive shafts 62, 62 are not differentially driven, and the front wheel 2 does not slip and escapes from the muddy body. Can be done.

Further, the above-described differential lock mechanism 129 can be linked with the turning operation of the steering handle 8. As shown in FIG. 38, diff lock rods 310, 310 are provided to protrude forward from the respective ends of the arms 308, 309,
Guide plates 311, 311 are formed at the front end,
The steering gear 82 is operatively connected to the steering gear 82 via a long hole 311a and an interlocking arm 312 to form interlocking means.
28 is locked.

That is, as shown in FIGS. 32 and 38,
An interlocking arm 312 pivotally supported by the operation shaft 86 is provided below the steering gear 82, and the interlocking arm 312
The pins 88 projecting from both right and left ends of the
The engaging portion 89, which is inserted through and attached to the long hole 311a at the tip of the 11 and protrudes from the lower surface behind the opening 82a of the steering gear 82, is turned by turning the steering handle 8 at a set angle or more.
When the steering gear 82 is rotated, the steering gear 82 is brought into contact with the interlocking arm 312 to rotate the interlocking arm 312, and depending on the rotation range, either the left or right through the pin 88 inserted into the long hole 311a. Activate the guide plate 311 and the diff lock rod 310,
Arm 3 linked to differential lock rod 310
08 (or an arm 309), the lock operation pin 307 is rotated, the lock body 306 is engaged with the ring gear 305, and the differential lock mechanism 129 is operated.
Further, the interlocking arm 312 is formed in a “H” shape in plan view, and pins 88 at the left and right ends of the interlocking arm 312 are formed.
Are arranged inside the left and right ends of the ring gear 305.

With such a structure, the steering handle 8 is turned and the engaging portion 89 is moved to the interlocking arm 31.
The operation start timing at which the differential lock mechanism 129 is actuated in contact with the steering wheel 2 is before the maximum operation of the steering wheel 8 (the maximum turning angle of the front wheel 2). Therefore, the steering wheel 8 is maximally operated to move the front wheel 2 inside the turning direction.
Before the driving force to be transmitted to the outside front wheel 2 is transmitted to the outside front wheel 2 and the power becomes excessive and idling, the differential lock mechanism 129 is operated to transmit the power evenly to the left and right front wheels 2 and 2 to perform the idling. It controls the turning maneuver accurately. The interlocking arm 312 is urged to a neutral position (a left-right direction of the interlocking arm 312) by a toggle spring or the like (not shown) and the steering handle 8 is operated to the neutral side.
Return to neutral and stop the operation of the differential lock mechanism 129.

Also, the front part of the differential lock rod 310 is slidably inserted back and forth into the rear surface of the guide plate 311.
A coil spring 313 is interposed between the front portion of the diff lock rod 310 and the rear surface of the guide plate 311. As described above, the guide plate 31 is connected via the interlocking arm 312 and the pin 88.
The cushioning member is configured such that when the 1 is rotated forward, the differential lock rod 310 is pulled forward via the coil spring 313. Therefore, the operation of the steering handle 8 can be operated beyond a certain range to operate the differential lock mechanism 129, and the steering handle 8 can be further rotated while operating the differential lock mechanism 129. At this time, the resistance for locking the differential device 128 is absorbed by the coil spring 313 serving as a buffer member, and transmission of the resistance to the steering handle 8 is suppressed, so that good operability can be obtained. Also, the gear 305a of the ring gear 305 constituting the differential lock mechanism 129
The lock body 306 can be made to stand by until the meshing position between the lock body 306 and the meshing teeth 306a on the side of the lock body 306 is aligned,
There is no tooth spillage.

The cushioning member is a differential lock rod 3
It is also possible to adopt a configuration in which 10 is divided into two in the front and back and slidably connected. Further, by providing the cushioning member, when the steering is performed in a field other than the field, the rotation of the arm 308 (or the arm 309) is forcibly fixed and the steering handle 8 is fixed.
The differential lock mechanism 129 can be prevented from being actuated even when the turning angle is operated to the maximum.

Further, the size of the elongated hole 311a is adjusted with respect to the amount of turning operation of the steering handle 8 or the size is adjusted so that the differential lock 129 is provided before the turning angle becomes maximum.
Is activated.

As shown in FIGS. 16 and 34, a seedling connection lever 76 is provided near the main clutch pedal 74 disposed on the left side in the body traveling direction, and the main clutch pedal 74 and the seedling connection lever are provided. By operating the lever 76, the tension of the belt 54 that transmits power from the engine 5 into the transmission case 6 can be set to the "off" state. And, in those operation systems, an accommodation mechanism is provided so that even if one operation tool is operated, the other operation tool is not affected. As shown in a side view of FIG. 34, for example, the accommodation mechanism is such that a long hole 140a is formed in an interlocking rod 140 pivotally supported by a bracket 142 provided on a rotation support shaft 141 of a seedling connecting lever 76. A fitting member 14 such as a pin protruding from a tension arm 57 for turning on / off the belt tension.
3 is inserted through the elongated hole 140a.

Therefore, when the seedling connecting lever 76 is turned rearward in the direction of the arrow in FIG.
40 moves downward, rotates the tension arm 57 downward through the fitting member 143 inserted through the elongated hole 140a, and separates the tension roller 58 attached to the tension arm 57 from the belt 54, The belt tension is set to the "off" state. On the other hand, when the main clutch pedal 74 is depressed, FIGS.
5, a pressing member 14 such as a pin attached to an L-shaped bracket 144 fixed to a support of the pedal.
5 pushes the cam 146 fixed to the rotation shaft 59 of the tension arm 57 to rotate the tension arm 57 downward, thereby bringing the belt tension into the "off" state. . Therefore, even if the main clutch pedal 74 is depressed, the tension arm 5
7 merely moves in the elongated hole 140a formed in the interlocking rod 140, and has no effect on the seedling connecting lever 76. Needless to say, it has no effect.

In any case, since two seedling levers 76, which are manual operating tools, and a main clutch pedal 74, which is a foot-moving operating tool, which are the same operation for stopping all power, are provided, it is possible to stay on the airframe. Alternatively, these operations can be performed even when the vehicle is down, and since the lever is a manual operation device and the pedal is a foot movement operation device, it is easy to identify and operate the two, and there is no erroneous operation. Further, since a wire or the like is not used for the mechanism for setting the belt tension to the "off" state, the operation force is light, the durability is good, and the maintenance can be easily performed. In addition, an electric switch that enables the engine to be started only at the "off" position of the seedling connecting lever 76 is provided, and the engine 5 can be started using the recoil starter 153 without depressing the main clutch pedal 74. Is available.

Further, the tension arm 57 has the structure shown in FIG.
5, the transmission case 6 as shown in FIGS.
Member 1 for stopping rotation of driven pulley 55 on the side
The brake member 147 is configured to press the driven pulley 55 by rotating the tension arm 57 downward. That is, a slide support plate 301 is provided on the transmission case 6 side of the tension arm 57 so as to project therefrom.
01, a side view “U” shaped support 303 is arranged on the lower surface,
A brake member 147 is slidably supported back and forth on the front and rear side surfaces of the support body 303, and a front portion of the brake member 147 is formed of an elastic body 149 such as rubber. A spring 148 is interposed and the brake member 1
47 is urged toward the driven pulley 55 side.

Therefore, the tension of the belt 54 is set to “OFF” and the elastic body 149 is connected to the driven pulley 5.
5 can be configured to stop rotation by being pressed into the pulley groove, and to apply a brake to the entire body, and run the traveling vehicle 1 on an ayumi plate in order to load or unload the vehicle on a truck bed. Or, the operator who got off the traveling vehicle 1 at the time of crossing the ridge when entering or exiting the field can operate the seedling connecting lever 76 to stop the traveling vehicle 1, so that the operability is extremely excellent. Has become.

Further, even when the main clutch pedal 74 is depressed during traveling outside the field, the tension arm 57
The amount of rotation of the driven pulley 55 is small, and the brake member 147 does not contact the driven pulley 55.
There is no braking. Further, the elastic body 149 is configured to be replaceable when it is worn, so that maintenance can be easily performed. And furthermore
If the elastic body 149 is baked on a cored bar, the durability can be improved.

The slide support plate 301 is provided with long holes 301a, 301a which are long in the left and right directions with respect to the traveling direction. The closing surface of the support 303 having a U-shape in side view is screwed into the bolts 302, 302 inserted from above the elongated holes 301a, 301a. 147 is slidably supported left and right. Therefore, the elastic body 149 at the tip of the brake member 147 can be adjusted so as to be perpendicular to the pulley groove of the driven pulley 55 and pressed accurately.

Therefore, when the driven pulley 55 is braked, it is possible to reliably brake without generating abnormal noise. Further, the brake member 147 can be supported at two places by using the front and rear side surfaces of the "U" -shaped support body 303, and the support rigidity in the rotation direction of the driven pulley 55 is increased, so that the elastic body at the end of the brake member 147 is provided. 149 can be pressed strongly against the pulley groove of the driven pulley 55, and the reliability of the braking operation is improved. Further, the bolt 302
By unscrewing the 302, the support body 303 is removed, and the replacement of the elastic body 149 at the end of the brake member 147 can be easily performed.

Next, the planting section 9 will be described. 39 is a plan sectional view of the planting transmission frame 92, FIG. 40 is a partial sectional view of a side view of the connecting member, FIG. 41 is a side view of the hitch, FIG. 42 is a rear view thereof, and FIG. 44 is a perspective view of the hitch, FIG. 45 is a view seen from the back of the seedling mounting table, and FIG. 46 is a side view of the seedling mounting table.

The planting transmission frame 92 is composed of transmission pipes 164 and 165 which are arranged in the front and rear direction in the left and right direction, and a horizontal connecting pipe 166 which is connected via cross-shaped pipe joints 167a and 167b. A drive case 172, a crank mechanism 171, and a seedling mounting support frame 190 are attached to the drive transmission frame 92.
A support plate 174 projects upward and forward from the side of the cross-shaped pipe joints 167a and 167b disposed at the front of the left transmission pipe 165 constituting the front transmission pipe 165. Orientation support plate 1
Reference numeral 75 protrudes in parallel with the support plate 174, and furthermore, a connecting member 260 that fits the rolling fulcrum shaft 176 forward of the left and right central portions of the horizontal connecting pipe 166 is provided.

That is, the configuration of the rolling fulcrum is shown in FIG.
9. As shown in FIG. 40, a connecting member 260 is inserted and fixed to the connecting pipe 166 of the planting transmission frame 92 at the center in the left-right direction.
The front part has a wider width in the left-right direction than the front part 66, and a front part upper part is formed in a substantially gate shape in a side view, and a bracket 260 a to be fitted to a lower part of a hitch 94 described later is formed. Have been. Also, the bracket 260a
A pipe 260b is inserted and fixed to the front and rear walls in the front and rear direction.

On the other hand, as shown in FIGS. 41 and 42, the hitch 94 at the rear of the elevating link mechanism 10 has a tapered shape in which the lower portion becomes wider in side view, and its cross section is substantially The lower part of the rear surface is fixedly closed by a plate with its open part facing rearward. By fixing the planting portion 9 in this manner, the hitch 94 to which the most force is applied has an efficient shape so that the strength of the lower side of the hitch 94 is increased. A top link pivot pipe 94i and a lower link pivot pipe 94j are fixedly provided on the upper and lower sides of both sides of the hitch 94, respectively. The top link 11 is pivotally supported on the upper left and right sides by pivot shafts. The lower link 12 is pivotally supported on the lower left and right sides by pivot shafts.

A substantially gate-shaped bracket 94a, which is open downward, is formed below the hitch 94. The bracket 94a has a size such that the bracket 260a can be just fitted to the outside. Joint holes 94 in the wall
b.94b are drilled in accordance with the position of the pipe 260b. Then, the bracket 94a is fitted from above the bracket 260a, and the pipe 260b
The stopper plate 176a fixed to the rolling fulcrum shaft 176 by inserting the rolling fulcrum shaft 176 shown in FIG. 43 with the centers of 260b and the joining holes 94b.
Is fixed to the lower portion of the front surface of the hitch 94 by fixing means such as screws. In this way, the planting transmission frame 92 is pivotally connected to the hitch 94. In such a configuration, the planting portion 9 is connected to the machine in a rollable manner, so that hitch base parts such as bearings which are conventionally used are not required, and the rolling fulcrum shaft 176 is smaller than the conventional rolling shaft. Parts can be used, and quenching and polishing are not required, and costs can be reduced.

Also, hook holes 94c, 94c,... Are formed at upper portions on both side surfaces of the hitch 94 at several positions in the vertical direction. Rolling correction spring 2 to return to
One end of 62 is hooked. Then, the other end of the rolling correction spring 262, as shown in FIG.
Are hooked on hook holes 96b, 96b,.

Since the hook holes 94c are provided on the side surfaces of the hitch 94 as described above, the work of applying the rolling correction spring 262 is performed by the hook holes 94c as compared with the conventional case where the hook holes are provided on the upper surface of the hitch. Spring 262
It can be easily performed because it is located substantially perpendicular to the hook. By arranging the hook holes 94c in the up-down direction and adjusting the hook position, the rotation direction of the seedling mounting table 91 can be efficiently corrected.
Since the other hook hole 96b is directly formed in the guide rail 96, not only a simple configuration that does not require a spring stay, but also a rolling correction spring 262 is located closer to the seedling mounting table 91, and The spring force acts efficiently so that the rolling correction spring 262 is substantially parallel to the guide rail 96 (the horizontal plane of rotation of the seedling mounting table 9), and forcibly corrects the left-right inclination (rolling) of the seedling mounting table 9. It is configured as follows.

Further, as shown in FIG. 44, the rolling correction spring 262 used is such that the hooking directions of the hook portions at both ends are shifted by 180 ° in phase, and at least one hook portion is connected to the coil portion. As shown in FIG. 45, the rolling correction spring 262 is provided in the hook hole 96b on the front surface of the guide rail 96 from the front side.
44, and the other hook portion is easily hooked to the hook hole 94c from the open surface at the rear portion of the hitch 94, as shown in FIG. It is. Further, after assembling the rolling correction spring 262, the rolling correction spring 26
The configuration is such that the interference between the rolling correction spring 2 and the guide rail 96 is prevented and the elastic force of the rolling correction spring 262 is efficiently transmitted. Further, the hook holes 96b are provided in the guide rails 9.
6 are provided at a plurality of positions in the left-right direction, and the spring force can be adjusted by changing the hook position. In addition, since high strength is not required on the upper side of the hitch 94 where the hook hole 94c is formed,
A cut-out hole 94d is provided in the front wall so that the inside of the hitch 94 can be easily checked from the front of the hitch 94 to improve the assemblability and reduce the weight.

On the other hand, wire brackets 94e, 94e for raising the marker are mounted on both side surfaces of the hitch 94 in the vertical direction in the middle part so as to protrude outward. The wire bracket 94e is formed of a substantially L-shaped plate in a side view, and has a wire groove 94
f and 94g are provided, and a hook hole 94h for the correction spring 263 is formed in the upper wall. As described above, the bracket conventionally used for the correction spring is eliminated, and the wire bracket 94e is used for both the left and right, thereby reducing the number of parts and reducing the cost. Then, as shown in FIG. 44, the correction spring 26 hung over the hook hole 94h.
By rolling the other end of 3 into a hook hole 260c attached to the front part of the connecting member 260, the rolling of the planting portion 9 is corrected.

In some cases, the correction arm for controlling the planting depth provided on the center float may be shifted from the center position of the machine body in the left-right direction. In this case, interference between the marker pulling wire 266 and the correction arm may be caused. Need to be avoided. Therefore, when the position of the correction arm is eccentric to the right in FIG. 42 from the center of the machine body, the wire bracket 94e is formed such that the depth of the wire groove 94f is deeper than the depth of the wire groove 94g. I have. In FIG. 42, the left wire bracket 94e supports the marker pulling wire 266 by the wire groove 94f, and the right wire bracket 94e supports the marker pulling wire 266 by the wire groove 94g. In this way,
By decentering the center of the path of the marker pull-up wires 266 from the center of the body to the right in FIG. 42, interference with the correction arm is prevented.

Further, the wire brackets 94e on both sides
A member provided with both of the wire grooves 94f and 94g is attached to 94e. This makes it possible to use the same component on both the left and right sides of the wire bracket 94e, thereby enabling cost reduction in the component manufacturing process. In this embodiment, the path of the marker pull-up wire 266 is adjusted by changing the depth of the groove to the wire bracket 94e having the same length in the left-right direction.
Can be prepared in different lengths to adjust the path of the marker pull-up wire 266.

Next, the support structure of the wire harness 264 will be described with reference to FIGS. Seedling stand 91
A harness support member 91c is mounted on the rear rail 91a at the center in the left-right direction. The wire harness 264 passes through a support hole 91d provided in the harness support member 91c from above and is locked, and extends below the seedling mounting table 91. A guide rod 265 is supported by the harness support member 91c near the rear part of the support hole 91d so as to be rotatable in the horizontal direction.

The guide rod 265 has a helical shape, guides the helical portion so as to include the wire harness 264, and extends from the upper portion of the hitch 94 to the front. With such a configuration,
By guiding the wire harness 264, the wire harness 264 does not hang or swing,
This prevents interference with the correction spring hook 262 and the hitch 94 and entanglement. Since the guide rod 265 clamps the wire harness 264 at the spiral portion, it does not require a separate clamping member for guiding a middle portion of the conventional wire harness, thereby reducing the number of components. Also, the guide rod 265
Is rotatable in the horizontal direction, so that the bending of the wire harness 264 can be prevented even when the seedling mounting table 91 moves left and right.

FIG. 47 is a plan view of the seedling support frame 190, FIG. 48 is a plan view of the float support portion, FIG. 49 is a side view of the same, FIG.
1 is a view showing a connected part on the back side of the seedling mounting table, FIG. 52 is a view showing a conventional connected body, FIG. 53 is a perspective view of the connected body, and FIG.
4 is a left side view of the front of the planting frame, FIG. 55 is a front sectional view of the vertical feed roller, FIG. 56 is a side view of the vertical feed roller,
FIG. 57 is a schematic diagram of a seedling table with the seedling stand shoes placed on the left side, FIG. 58 is a schematic diagram of a seedling table with the seedling stand shoes placed on the right side, and FIG. It is a perspective view of.

As shown in FIGS. 43, 47 and 48, the planting transmission frame 92 is integrated with the seedling mounting support frame 1.
Numeral 90 is fixed by welding or the like, and the seedling mounting support frame 190 is formed in a rear view gate type.
The right side is fixed to a cross-shaped pipe joint 167a arranged on the front side. Therefore, it has a simple structure in which the pipe bodies are connected, and is integrally formed with the planting transmission frame 92 having a sufficient space, so that the crank mechanism 171 and the seedling table driving case 1
72, the support portion of the transverse feed shaft 180 is firmly fixed, and a durable support portion resistant to vibration and impact can be configured.

A lever guide 178 of a seedling collecting amount adjusting lever projects forward and downward from the right side of the horizontal frame 190a of the seedling mounting support frame 190, and a planting depth adjusting lever 79 extends forward and downward from the left side of the horizontal frame 190a. Lever guide 179 is protruded. The seedling support frame 19
A roller member 199 that fits on a guide rail 96 provided in the middle part of the seedling table 91 on the upper and lower sides behind the seedling mounting table 91 is arranged on both sides of the seedling mounting table 91.

Next, the planting transmission frame 92 will be described. Since the planting portion shown in FIG. 39 is for four-row planting, four planting claws 93 are provided, and transmission pipes 164 and 165 for transmitting driving force to the planting claw 93 are provided one each on the left and right. It is arranged. The front portions of the transmission pipes 164 and 165 are connected by a horizontal connection pipe 166, and a portal-type planting transmission frame 92 is integrally formed in plan view. Planting claws 93 are arranged on both left and right sides of the open end. In addition, this transmission pipe 1
A transmission shaft is rotatably supported inside the horizontal connecting pipe 166 and the horizontal connecting pipe 166. By configuring the planting transmission frame 92 in this manner, the manufacturing cost can be reduced and the rigidity is high, but the weight is reduced, so that the weight of the whole planting portion 9 can be reduced, and the lifting link mechanism 10 and the The burden on the body frame 4 can be reduced.

The transmission pipes 164 and 165 and the horizontal connection pipe 166 of the planting transmission frame 92 are formed of rod-shaped steel pipes, and the transmission pipes 164 and 165 and the horizontal connection pipe 166 are cross-shaped in plan view. Mold fitting 16
7a and 167b. The transmission pipes 164 and 165 and the cross-shaped pipe joints 167a and 167
b aims at cost reduction by using a commercially available product,
The diameter of the opening of the cross-shaped pipe joint 167 is larger than that of the power transmission members such as the transmission pipes 164 and 165 disposed therein and the bushing and bevel gears which are the supporting members thereof, and the cross-shaped pipe joint 167 is inserted or assembled. , Making maintenance easy. One of the cross-shaped pipe joints 167a and 167b is cut short, and the opening of the cross-shaped pipe joint 167a / 167b is an insertion opening for closing the lid 168. The shaft is inserted through this opening. It allows maintenance such as assembling, changing gears and lubricating.

A cross-shaped pipe joint 167a fixed to the right side of the horizontal connecting pipe 166 has a transmission shaft 18 at the right opening.
7, the cover 168 is inserted and fixed, and the transmission shaft 187 is inserted.
The right end of the cross is a cross-shaped pipe joint 167 via a bush 170.
a, and a bevel gear 187a is fixed to an end of the transmission shaft 187. The cross-shaped pipe joint 16
The planting input shaft 185 is inserted into the front opening of 7a, the planting input shaft 185 is rotatably supported by the bearing 400a, and the bevel gear 18 is inserted into the cross-shaped pipe joint 167a.
5b is fixedly engaged with the bevel gear 187a. The front end of the transmission pipe 164 is inserted and fixed in the rear opening.

The left cross-shaped pipe joint 167b has a horizontal connection pipe 166 inserted and fixed in a right opening, and the left side of the transmission shaft 187 is rotatably supported by a bearing 400b in the left opening. Transmission shaft 187 in 167b
A bevel gear 187b is fixedly mounted on the upper end, a support plate 174 is fixed to the left opening end, a seedling stand driving case 172 is fixed to the support plate 174, and a transmission shaft 187 is mounted in the seedling stand driving case 172. Is inserted. A transmission shaft 186 is inserted from the front opening of the left cross-shaped pipe joint 167b, and is fitted and fixed with a lid 168. The front portion of the transmission shaft 186 is supported by the bush 170 at the rear opening. At the front end, a bevel gear 186b is fixedly mounted.
7b, and the front end of the transmission pipe 165 is inserted and fixed in the rear opening of the left cross-shaped pipe joint 167b.

Rear cross-shaped pipe joints 169 and 169 are externally fitted and fixed to the rear ends of the left and right transmission pipes 164 and 165, respectively. The rear cross-shaped pipe joint 169 has substantially the same configuration as the cross-shaped pipe joint 167. The front openings of the rear cross-shaped pipe joints 169 and 169 are the transmission pipes 164 and 165.
And the rear portions of the transmission shafts 185 and 186 are supported by bushes 170 and 170, and bevel gears 185a and 186a are fixed to the rear ends of the shafts. The rear opening is fixedly covered with lids 168, 168, and the left and right openings rotatably support a planting claw drive shaft 184 via bearings 400c, 400c, and a crank mechanism 171 disposed on both sides thereof. The power is transmitted to.

Further, at the rear of the rear cross-shaped pipe joints 169 and 169 disposed at the rear of the transmission pipes 164 and 165,
A crank support arm 173 is provided to protrude rearward and upward.
As shown in the figure, a pivot 181 is formed, and a pin 182 that pivotally supports the base of the link 401 of the crank mechanism 171 is fixed to the pivot 181. In addition, a space between the left and right pivot portions 181 is reinforced by a portal-type reinforcing member 183 in a plan view, so that the crank mechanism 171 can be strongly pivotally supported. The crank support arm 17
The rear portion 3 may be branched in two directions to form a substantially Y-shape in plan view to form the pivot 181.

The links 401 of the crank mechanism 171 are provided on both left and right sides of the rear end of the crank support arm 173, respectively.
Is pivotally supported, and the base of the swing arm 402 having the planting claw 93 attached to the other end of the link 401 is pivotally supported, while the rear cross-shaped pipe joint 169.
Rotating arms 403 are fixedly mounted on both ends of a planting claw drive shaft 184 which is pivotally supported by the rotation arm 169, and the other end of the rotating arm 403 is pivotally supported at an intermediate portion of the swing arm 402. By driving the 403 to rotate, the planting claw 93 is caused to crank.

The input shaft 185 is connected to one end of a PTO transmission shaft 158 via a universal joint 159 at a portion projecting forward from the lateral direction of the front right cross-shaped pipe joint 167a. Power from the shaft 65 is transmitted via the PTO transmission shaft 158 and the universal joint 159. Therefore, the transmission is simple, the number of parts can be reduced, and the cost can be reduced.

A bevel gear 185a is fixed to the rear end of the input shaft 185, and is meshed with a bevel gear 184a fixed in the middle of the planting claw driving shaft 184 so that the planting claw driving shaft 1 is engaged.
84 is driven. A bevel gear 185b is fixed to the front side of the input shaft 185, and is engaged with a bevel gear 187a fixed to an end of the transmission shaft 187 of the connecting pipe 166 to transmit power to the transmission shaft 187. A bevel gear 187b is fixed to the left side of the transmission shaft 187, and is meshed with a bevel gear 186a fixed to the front of the transmission shaft 186 in the left transmission pipe 165 to be transmitted to the transmission shaft 186, and to be transmitted to the rear of the transmission shaft 186. Bevel gear 186 fixed to the end
b and the bevel gear drive shaft 184 via the bevel gear 184a.
Is driven to drive the crank mechanism 171 disposed on the rear side of the transmission pipes 164 and 165 to move the planting claw 93 in FIG.
The seedlings are planted by rotating them so as to draw a locus indicated by reference numeral 9. Therefore, an efficient and simple power transmission mechanism with no power loss can be realized.

Next, a mechanism for transmitting power to the seedling mounting table such as the lateral feed shaft 180 will be described. A seedling mounting drive case 172 is fixedly mounted on the outer surface of the support plate 174. The fitting portion between the support plate 174 and the seedling mounting drive case 172 does not require packing, does not allow water to enter, and is easy to assemble. As shown in FIG. 50, the seedling table driving case 1
A step 174 a is formed around the support plate 174 corresponding to the outer periphery of the base 72.

The support plate 1 fixed to the front of the support plate 174 and the right side of the horizontal connecting pipe 166 is used.
A transverse feed shaft 180 is supported at the front part 75 via a bearing 405 and a boss 406, respectively. The transverse feed shaft 1
The shims 407 and 407 are provided between the boss 406 and the support plates 174 and 175 so that the boss 80 and the support plates 174 and 175 can be accurately assembled without rattling between the support plates 174 and 175.
Are interposed so that the gap can be easily adjusted. The left end of the lateral feed shaft 180 is the seedling table driving case 1
72. The transverse feed shaft 180 is disposed in parallel with the connecting pipe 166, and the transverse feed shaft 180 is disposed above the rolling fulcrum shaft 176 in a side view. It has a good arrangement configuration.

The transmission shaft 187 in the connecting pipe 166
Is also inserted into the seedling mounting table driving case 172, and a gear 188 is fixedly provided at the end, and the seedling mounting table driving case 17
The gear 189 is also provided at the left end of the transverse feed shaft 180 inserted in
Is fixed, and the gear 188 and the gear 189 mesh with each other to form a seedling mounting drive mechanism for transmitting power to the transverse feed shaft 180. A groove 180a for sliding the slider is formed on the traverse shaft 180, and a slider receiver 191 is loosely fitted on an outer peripheral surface of the traverse shaft 180, and the slider receiver 1 is provided.
A slide 192 provided in the groove 91a is fitted into the groove 180a, and the groove 180a
Slider receiver 191 reciprocates left and right on transverse feed shaft 180.

The rear part of the slide receiver 191 is the seedling mounting table 91.
Is fitted and fixed to a connecting body 410 provided on the back side of the connector. As shown in FIG. 52, the conventional connector 410 'is formed in a U-shape, and the slider receiver 191 is connected to the connector 4 from above.
Although the flat head pin 411 was inserted into the upper part of the connecting body 410 'after the insertion into the 10', the number of parts was large, and the flat head pin 411 was passed after the seedling mounting base was assembled, which was troublesome work. Therefore, in the present embodiment, FIGS.
As shown in the figure, the connecting body 410 is sheet-metal processed into a "b" shape when viewed from the front, and a notch 410a is provided on the front part of the connecting body 410 so that it does not come out upward when assembly is completed, so that assembly is easy. I can do it. In this way, the seedling mounting table 91
Are connected, and the seedling mounting table 91 is
Is accurately reciprocated right and left.

Further, as shown in FIGS. 39 and 54, a human-powered shaft 185 is provided at the right end of the transverse feed shaft 180 in a side view.
A vertical feed cam 193 protrudes from the upper position of the horizontal feed shaft 1 to eliminate the conventional vertical feed shaft for driving the vertical feed cam 193.
80 is also used as a vertical feed shaft. Therefore, the number of parts is reduced and the cost is reduced. The outer side (right side) of the vertical feed cam 193 is shown in FIG.
As shown in FIG. 4, a cam cover 412 is provided to cover a side other than a position where the vertical feed cam 193 is in contact with a driven cam (cam follower) 413 (FIG. 46) around the rotation of the vertical feed cam 193. This prevents injuries and entanglement of the wire harness and the like.

The vertical feed cam 193 is disposed so as to be in contact with a driven cam 413 provided at the lower part of the back (front) of the seedling mounting table 91. The driven cams 413 are protruded from left and right. The distance between the driven cams 413 is set to 9
1 so that the vertical feed cam 193 and one driven cam 413 are in contact with each other at the end position of the horizontal reciprocation of the seedling mounting table 91. The base of the driven cam 413 is connected to a vertical feed shaft 414 via a one-way clutch, and the vertical feed shaft 414 is rotatably suspended below the seedling mounting table 91, and as shown in FIG. The vertical feed driven shaft 415 is supported rotatably in parallel,
Are vertically fitted on the vertical feed shaft 414 and the vertical feed driven shaft 415 for each strip, respectively, and the vertical feed rollers 194, 194,.
A vertical feed belt 195 is wound between upper and lower vertical feed rollers 194 so as to protrude from an opening provided in the seedling mounting table 91.

As described above, when the lateral feed shaft 180 is driven and the seedling mounting table 91 is reciprocally slid left and right and reaches the right end or the left end, the tip of the vertical feed cam 193 is moved to the driven cam 413 by the rotation of the vertical feed cam 193. The driven cam 413 is rotated by the contact, the rotation of the driven cam 413 causes the vertical feed shaft 414 to be rotated via the one-way clutch, the vertical feed belt 195 is rotated, and the seedling mat is accurately moved downward. It is fed vertically. When the vertical feed cam 193 moves away from the driven cam 413, the driven cam 413 returns to its original position by the return spring.

The structure of the vertical feed roller 194 is conventionally complicated in outer peripheral shape,
It is necessary to use four molds, each of which is divided into four in the circumferential direction of the vertical feed roller 194, for forming the mold. In this embodiment, as shown in FIG. 55 and FIG. 56, the ridges 195a, 195a,. It is arranged so that it can be easily manufactured with left and right split molds. That is, cost reduction is achieved by reducing the number of dies.

Further, as shown in FIG.
An opening 91b is formed in the rib 91a that separates the portion where the seedling mat is placed on the seedling mounting table 91 where the 13 is located from left to right, and is usually closed with a lid. However, when performing maintenance, open the lid. Lubrication or the like can be performed on a rotating portion with the vertical feed shaft 414.

As shown in FIG. 43, three seedling stand shoes 416, 416, 416 are arranged below the seedling mounting table 91 so as to be able to slide on the lower rail 95 smoothly. Conventionally, as shown in FIG. 45, four seedling stand shoes 416 are arranged at equal intervals. However, in a small-sized, especially four-row rice transplanter, three seedlings can be sufficiently supported and have durability. Therefore, in the present embodiment, the seedling stand shoe 416
Are located at three places: the lower left and right sides and near the center. When the spring force for returning the driven cam 413 is large, as shown in FIG. 57, the center seedling stand shoe 416 is arranged closer to the side where the driven cam 413 is located, and the driven cam 413 returns. The force sometimes applied is received by the seedling stand shoes 416 on the center and the left side. Also,
When there is almost no shock when the spring force returns weakly, as shown in FIG. 58, the seedling stand shoe 416 at the center is arranged to the right side, and the vertical feed cam 193 is driven to receive the driven cam 413. The moment generated by the force is received by the center and right seedling stand shoes 416. By reducing one seedling stand shoe 416 in this manner, weight reduction and cost reduction are achieved.

The seedling mounting table 91 is mounted on the lower rail 95 so as to be slidable left and right. As shown in FIGS. 43, 47 and 59, both sides of the lower rail 95 are stays 420 and 420.
The stay 420 has an inverted L-shape when viewed from the rear. A hook 421 having an inverted U-shape is fixed to the upper surface of the stay 420, and a guide rod 422 projects from the lower surface of the stay 420. Has been established. On the other hand, U-shaped guide stays 423, 423 are fixed to the front side surfaces of the transmission pipes 164, 165 of the planting transmission frame 92, and the stays 42, 423, 423 are fixed to the guide stays 423, 423.
The side surface of No. 0 and the guide rods 422 are guided when ascending and descending.

The base of the seedling collection amount setting lever 196 is fixed to the right side of the fulcrum shaft 424 provided in the left and right direction, and engaging plates 425 and 425 are provided on both left and right sides of the fulcrum shaft 424 to protrude rearward. Recesses formed at the tips of the engagement plates 425 are inserted into and engaged with the hooks 421.
The right end of the fulcrum shaft 424 is connected to the cross-shaped pipe joint 16.
The bracket 426 is pivotally supported by a bracket 426 fixed to 7a, and the left end is pivotally supported by the support plate 174. However, the left end of the fulcrum shaft 424 is connected to the cross-shaped pipe joint 167b by the bracket 4.
It is also possible to fix and support 26. The upper part of the seedling collection setting lever 196 is the lever guide 178.
And is projected forward and upward.

Next, the configuration of the seedling mounting table 91 will be described. 60 is a bottom view of the seedling mounting table, FIG. 61 is a side view of the seedling mounting table, FIG. 62 is a front view of the seedling mat press, FIG. 63 is an exploded perspective view of the seedling mat press, FIG. Fig. 65
FIG. 66 is a bottom view of the seedling mat press formed integrally with all the strips, FIG. 66 is a mounting view of the conventional seedling mat press, and FIG. 67 is a mounting view of the conventional strip stopper.

[0147] The seedling table 91 is provided with the transverse feed shaft 18 as described above.
0 is connected to the front of a slider receiver 191 that reciprocates on the left and right.
1 is mounted to reciprocate left and right. The seedling mounting table 91 in this embodiment is four-row planting. The seedling mounting table 91 is mounted so as to have a front height and a low height, and a seedling mat retainer 250 formed by a pipe is provided on the upper side surface at the rear end.
And a seedling holding rod 251 is mounted.

The seedling mat presser 250 and the seedling presser bar 25
Numeral 1 is composed of parts having a width of two streaks in the left-right direction as shown in FIGS. 60 and 61, and two pairs of seedling mat pressers 250 and seedling presser rods 251 are provided below the four-row planting seedling mounting table 91. It is configured to be arranged. And the seedling mat presser 250
Is an outer frame 2 formed of a pipe having a substantially U-shape in plan view.
50a and a reinforcing frame 250b fixed in the left-right direction on the open side of the outer frame 250a are integrally formed, and further, a holding frame 250c formed of a substantially L-shaped pipe in a side view. The pipe extending parallel to the seedling feeding direction is the rear surface of the seedling mounting table 91 (the seedling mat mounting surface).
Are placed at regular intervals so that they do not shift or fall when the seedling mat is placed.

The presser frames 250c, 250c,.
The other end is attached to the lower part of the pipe in the left and right direction of the outer frame 250a. The holding frame 250c is
Two pipes are provided on the left and right pipes of the outer frame 250a for one width, that is, in the present embodiment, the outer frame 250a
a: 2 to 4 presser frames 250c, 250c ...
・ Attached. The lower part of the holding frames 250c, 250c,.
Since it is configured to be fixedly mounted (or contacted) on the upper surface side of 50b, sufficient strength can be secured with a simple configuration.

The seedling holding rod 251 is substantially U-shaped in plan view.
It is formed by a letter-shaped pipe. On the lower side surface of the seedling mounting table 91, frame supporting plates 252 and 252 project as support members at the ends in a direction substantially perpendicular to the seedling mounting table 91, and the frame supporting plates 252M also protrude on the right and left center ribs. Then, they are mounted on the left and right sides and the center of the lower end of the seedling mounting table 91 at three places. A mounting plate 252a is fixed to an upper portion of the frame support plate 252, and both end portions of the outer frame 250a of the seedling mat presser 250 are fixed to upper surfaces of the mounting plate 252a by clamps 253a. Stick 2
51 are fixed on both sides by clamps 253b. Therefore, the seedling mat presser 250 and the seedling presser bar 251 can be supported by one supporting member (clamps 253a and 253b), and the cost can be reduced by reducing the number of parts. As shown in FIGS. 62 and 63, the clamp 253a for fixing the seedling mat presser 250 is fastened from above by a fixing screw 254, and by loosening the fixing screw 254, the detachment of the seedling mat presser 250 is performed. Or adjust the height. The fixing screw 254 has an arm portion bent at the upper portion, and can be easily rotated, thereby improving the operability of attaching and detaching the seedling mat presser 250.

The outer frame 250a and the reinforcing frame 250b are provided with a stitch 256 for each strip, and the stitch 256 projects the arm 257 from both sides downward, and is integrally formed in an L-shape in side view. The arm 257 is provided with an engaging portion 257a at the end thereof, and is rotatably supported on the reinforcing frame 250b so as to be detachable. A hook 256a is formed at the rear end of the stop 256, and the hook 256a can be locked to the outer frame 250a.

In the case where the locking is not performed in this manner, the locking 256 is rotated upward and the hook 256a is turned on.
The hook 256a is disengaged and locked downwardly around the engaging portion 257a so that the tip of the locking 256 is fixed to the seedling mounting table when the locking is performed. The seedling mat is prevented from slipping downward by contacting the seedling mat. With such a configuration, a new component for pivotally supporting the streak 256 is not required unlike the related art, and the seedling mat retainer 250 can be used as a supporting member.

[0153] The seedling mat presser 250 and the seedling presser bar 251 are arranged on one seedling table on the left and right sides.
As shown in FIG. 65, a set of a seedling mat presser 250 and a seedling presser bar 251 can be used. in this case,
Since it becomes longer in the left-right direction, the central portion is bent by its weight.
The support member 255 in the vicinity of the center formed in the shape of a letter is
1 is fixedly mounted on the central rib. And FIG.
As shown by 4, a portion of the support member 255 protruding upward on the short side is formed in a substantially triangular shape, and a long groove 255 a for supporting the reinforcing frame 250 b of the seedling mat presser 250 is formed in the upper side of the short side. In the center, the seedling holding rod 251
A long hole 255b for inserting and supporting the hole is formed.

In this manner, the bending force is applied to the vicinity of the center in the left-right direction, and the seedling mat presser 250 and the seedling presser bar 25
1 is supported from below by a support member 255, and has a simple structure and plays a sufficient reinforcing role. Further, the reinforcing frame 250b is moved to an appropriate position in the long groove 250a and the seedling holding rod 251 is moved to an appropriate position in the long hole 255b, and is fixed by the clamp 253.
The height of the seedling mat presser 250 and the seedling presser bar 251 can be adjusted.
It does not come off as regulated by 5b.

By configuring the seedling mat presser 250 and the seedling presser bar 251 as described above, the number of parts is greatly reduced as compared with the conventional structure for holding the seedling mats which are attached on a per-row basis. In addition, since the assembling configuration is simplified, the maintainability is excellent. Therefore, the number of parts can be reduced, and the manufacturing cost can be reduced by simplifying the assembly process. In addition, since the height adjustment of the seedling mat presser 250 and the seedling presser bar 251 is realized by the support member 255 having a simple configuration, the operability is excellent, and a plurality of seedling mat pressers 250 and Seedling holding stick 2
Since the 51 has an integral structure, the height of a plurality of strips can be simultaneously adjusted to the same height, and with a simple configuration,
It is possible to hold the seedling mat securely.

In this embodiment, two pairs of two-row seedling mat holders 250 and two seedling holder bars 251 are mounted on the four-row planting seedling table 91. In this case, the combination is appropriately adjusted, such as mounting two pairs of three-rows or three pairs of two-rows. Further, as described above, the seedling mat retainer 250 integrated with all the rows is provided.
It is also possible to attach a seedling holding rod 251. By adopting such a configuration, the height adjustment of the seedling mat presser 250 and the seedling presser bar 251 can be adjusted to be the same height at a time for all the strips, and the number of parts can be further reduced and the assembly process can be simplified. Therefore, the weight of the rice transplanter can be reduced and the cost can be reduced.

Next, a center float 97 for leveling and a side float 98.9 for keeping the planting portion 9 at a certain height.
Next, the support structure with the support 9 will be described. 1, 48, 4
As shown at 9, a fulcrum shaft 161 is provided horizontally below the planting transmission frame 92, which is a power transmission portion of the planting portion 9, in accordance with the width of the left and right side floats 98 and 99.
1 is a mounting plate 430/43 having both sides formed in a U-shape.
0 of the mounting plate 430
Is fixed to the lower portions of the support plates 174 and 175 with bolts or the like, and the fulcrum shaft 161 is attached to the planted transmission frame 92.
It is supported by.

The operating arm 1 is located forward of the fulcrum shaft 161.
63 is projected, and a planting depth setting lever 79 is provided above the rear end of the operation arm 163. Therefore, the operator can easily operate the planting depth setting lever 79 and can easily adjust it. Also, support arms 162, 162,... Project toward the rear of each float below the proper position of the fulcrum shaft 161, and the rear of each float is provided at the rear of the support arms 162, 162,. It is pivoted.

A sensor link 431 for detecting the distance between the planting portion and the rice field is disposed on the front of the center float 97, and is supported by the operation arm 163. The front end of the center float 97 is located below the rear wheel drive shaft 69 located at the rear end of the transmission case 6. In order to achieve such an arrangement, the lengths of the top link 11 and the lower link 12 of the elevating link mechanism 10 are shorter than in the related art. Then, as shown in FIG. 30, the shape of the lower rear portion of the transmission case 6 is substantially the same as the vertical trajectory x of the center float 97.

With this configuration, when the planting section 9 is moved up and down, the front end of the center float 97 is moved up and down along the rear part avoiding the transmission case 6, and the center float 97 and the transmission case 6 are moved up and down.
Are raised and lowered without interference. And
The overall length of the rice transplanter is shortened, the distance between the driver's seat 7 and the planting section 9 is shortened, and the seedling can be easily transferred. In addition, the planting portion 9 can be provided at the front, so that the weight balance can be improved.

Next, the support structure of the side floats 98 and 99 for supporting the planting section 9 during the planting operation will be described.
68 is a side view of the side float support portion, FIG. 69 is a plan view of the same, FIG. 70 is a plan view of a drawing marker mounting portion on the fulcrum shaft side, and FIG. 71 is a side view of the same.

48, 49, 68, and 69, a pair of support arms 162, 162,.・ It is protruding. On the other hand, on the rear upper surfaces of the side floats 98 and 99, a support plate 270 bent in a substantially L-shape as viewed from the front is attached. The side plate 270a of the support plate 270 is formed in a substantially triangular shape in a side view, and a pin hole 270c for inserting a support pin 270b is formed in the side plate 270a. The support arm 162 projecting rearward and downward from the support shaft 161 has a substantially inverted U-shaped cross section when viewed from the front. 270 are fitted from above the side plate 270a, and are rotatably supported by the support pins 270b.

In this embodiment, each of the left and right side floats 98 and 99 has two support arms 1.
It is supported by 62. 69, a coil spring 271 is wound around the outer periphery of the support pin 270b pivotally supporting the left support arm 162, and a hook portion 271a at one end of the coil spring 271 is hooked on an intermediate portion of the left support arm 162. Stopped, the coil spring 2
The other end of 71 extends above the bottom surface of the support plate 270 and presses the upper surface of the side float to urge the front part of the side float to be lifted and kept horizontal. However, the coil spring 271 may be an elastic body, and is not limited as long as the coil spring 271 is urged horizontally by a leaf spring or rubber.

The portion of the rear lower surface of the support arm 162 which is in contact with the upper surface of the support plate 270 is, as shown in FIG.
A lower stopper surface 162a is formed by cutting obliquely rearward and upward from the lower side of the pivot position by the support pin 270b,
The support pin 270b is cut obliquely forward and upward from below the pivotal position of the support pin 270b to form a lifting stopper surface 162b. In this way, the stopper surface 16
2a and 162b, the coil spring 2
The elastic force of the side 71 absorbs the vertical swing of the side floats 98 and 99, and is lowered by the stopper surface 162a when the planting portion 9 is lifted or when the planting work passes over a rough cultivated till. 98 ・ 99
Is prevented from being rotated more than a predetermined angle to damage other members, and the amount of rotation is regulated. In addition, the side floats 98 and 99 are used for leveling work with the side floats 98 and 99.
Even if the front portion 99 is suddenly lifted, the amount of rotation is regulated by the raising stopper surface 162b, so that it does not interfere with other members.

Further, a planting depth setting lever 79 is provided projecting forward and above the fulcrum shaft 161, and the distal end thereof is connected to the lever guide 1.
79 and project rearward of the driver's seat. For this reason,
The operator can easily operate the planting depth setting lever 79 and can easily adjust it. And
When the planting depth setting lever 79 is operated, the support arm 1
The rear end of 62 moves up and down about the fulcrum shaft 161, and the distance between each float and the planting transmission frame 92 is adjusted.
The depth at which the cut seedlings are planted by the planting claws 93 can be adjusted.

With this configuration, the side float 98
Since it supports the 99, the front part of the side floats 98 and 99 does not require a conventional support member,
Since the space in the front part is opened, the lateral feed mechanism can be arranged, and the planting section 9 and the seedling mounting table 91 can be arranged in the front, so that the overall length can be shortened. In addition, in front of the fulcrum shaft 161, in a space above the side float 99, a seedling mounting table drive case 172 for storing the planting transmission mechanism.
, The planting section 9 has a compact configuration. Accordingly, the planting section 9 and the seedling mounting table 91 can be arranged at a position immediately behind the rear wheel 3, so that the overall length of the rice transplanter can be shortened and the balance of the front wheel 2 can be improved. Since the supporting members conventionally provided at the front portions of the side floats 98 and 99 can be eliminated, the number of parts can be reduced and the cost can be reduced.

Further, drawing markers 272 and 272 are attached to both sides of the fulcrum shaft 161. That is, FIG.
71, the drawing marker 272 has a base end fixed to a marker bracket 273. The marker bracket 273 is formed in an inverted U-shape in a side view. Fulcrum shaft 161
Are pivotally supported on both sides thereof so as to be vertically rotatable. The lower end of the marker bracket 273 is engaged with one end of a first marker urging spring 276, and the other end of the first marker urging spring 276 is engaged with a stay 277 fixed to a fulcrum shaft 161. Is biased so that its tip pivots downward. A locking pin 288 is suspended from above the marker bracket 273, and a wire 278 for lifting the drawing marker 272 is connected to one end of the locking pin 288.

A marker hook 274 is mounted on a fulcrum shaft 161 on the center in the left-right direction of the marker bracket 273.
Is pivotally supported by a pin 279, the lower end of the marker hook 274 is locked at one end of a second marker biasing spring 268, and the other end of the second marker biasing spring 268 is locked at the stay 277. ing. A wire 267 for unlocking is locked at an intermediate portion of the marker hook 274 so that the tip of the marker hook 274 can lock the locking pin 288 as a hook portion.

In such a configuration, when the planting portion 9 is raised, the pulling wire 278 is pulled,
The drawing marker 272 is lifted by rotating upward (the drawing marker 27 indicated by a dashed line in FIG. 70).
2 'and marker bracket 273'). Then, the locking pin 288 of the marker bracket 273 is locked to the marker hook 274 at the rising end position, and the drawing marker 2
72 is held in the raised position. In addition, the drawing marker 27
2 to draw a line on the field by pulling the wire 267 for unlocking, the engagement between the marker hook 274 and the locking pin 288 is released, and the marker bracket 273 is moved to the first marker biasing spring 276. And the drawing marker 272 is turned to the side. When the operation of the wire 267 is further stopped, the marker hook 274 is moved to the second marker urging spring 26.
8, the tip of the marker hook 274 is urged to rotate downward, and the tip end surface 274a of the marker hook 274 comes into contact with the locking pin 288, thereby pushing the drawing marker 272 so as to rotate downward. Two biasing springs 276
At 268, the drawing marker 272 is pushed, and the drawing marker 272 is always pushed into the field without being lifted, so that the line is drawn reliably.

Next, the configuration of power transmission to the planting section will be described. 72 is a side view showing a power transmission configuration to the planting portion, FIG. 73 is a plan view showing a power transmission configuration to the planting portion, and FIG. 74 is a plan view showing a power transmission configuration to another type of planting portion. , FIG. 75
FIG. 9 is a plan view showing a configuration for transmitting power to a planting section in another form.

As described above, in the planting transmission frame 92 of the planting portion 9, the universal joint portion 159 is interlockingly connected to the PTO shaft 65 supported on the transmission case 6 side. Specifically, as shown in FIGS. 72 and 73, the PTO shaft 65 is projected from an opening provided in a mating surface of the transmission case 6 having a half-split shape,
A PTO transmission shaft 158 operatively connected to the shaft 65 is disposed above and along the mating surface. The PTO transmission shaft 1
Reference numeral 58 is pivotally supported by a support member 160 erected on the rear upper portion of the transmission case 6. The mating surface of the transmission case 6 is located at the center of the traveling vehicle 1 on the left and right sides.
The TO shaft 65 and the PTO transmission shaft 158 are also arranged at the same left and right central portions.

The power transmission from the PTO shaft 65 to the planting transmission frame 92 is desirably performed linearly forward and backward from the viewpoint of shortening the power transmission path. The front part of the center float 97 is warped upward and forward in the front of the left and right central parts of the center float. When the planting part 9 is raised, the front part of the center float 97 overlaps on the power transmission path. Power cannot be input to the left and right central portions of the transmission frame 92.

Therefore, as described above, the input shaft 185 is pivotally supported on the right transmission pipe 164 of the planting transmission frame 92, and power is taken in from the side of the center float 97. The front portion of the input shaft 185 and the PTO transmission shaft 158 are interlocked and connected by using a universal joint portion 159 that is arranged in an inclined manner, and are arranged so as to bypass the center float 97 in plan view. Since a universal joint is formed at the front and rear ends of the universal joint portion 159, the axis of the input shaft 185 is shifted to the right with respect to the PTO transmission shaft 158, and is further moved up and down by the lifting drive of the lifting link mechanism 10. Even if moved in parallel, power can be transmitted.

Therefore, the center float 97 and the universal joint 159 may interfere with each other even when the planting section 9 is raised by the vertical drive of the vertical link mechanism 10 as shown by the two-dot chain line in FIG. Also, even if the planting part 9 is lowered, the front side of the universal joint part 159 passes through the side of the rear part of the transmission case 6, so that it does not interfere with the transmission case 6 and the planting part 9 The lifting stroke can be lengthened. Furthermore, even if the front-rear length of the elevating link mechanism 10 for suspending the planting portion 9 so as to be able to move up and down can be shortened, the up-and-down elevating stroke can be increased, and a compact rice transplanter having a shorter overall body length can be provided. Can be realized.

The transmission pipe 164 that supports the input shaft 185 is disposed in the front-rear direction as shown in FIG.
The PTO transmission shaft 158 and the input shaft 185 are parallel in plan view. Further, as shown in FIG.
Since the transmission pipe 164 is disposed parallel to the transmission shaft 158, the PTO transmission shaft 158 and the input shaft 185 are parallel in a side view, and the PTO transmission shaft 158
From the power to the universal joint 159,
The power transmission from the universal joint portion 159 to the input shaft 185 is equal, and the rotation speed transmitted to the input shaft 185 does not increase or decrease, and the power that has been inter-shifted in the transmission case 6 is accurately transmitted. Therefore, the planting performance is maintained high without adversely affecting the planting drive.

As shown in FIG. 74, a concave portion 97a is formed in the center of the front of the center float 97, which is warped upward and forward, and a universal joint is formed linearly rearward from the rear end of the PTO transmission shaft 158. The portion 159 'may be protruded to transmit power to the left and right central portions of the planting transmission frame 92. In this configuration, even if the planting section 9 is raised by using the lifting link mechanism 10, the intermediate portion of the universal joint section 159 'is arranged in the concave portion 97a, so that the power is not interfered by the center float 97. A transmission path can be configured. In this case, it is necessary to displace the sensor link 431 disposed at the front part of the center float 97 to the left and right so as not to interfere with the universal joint 159 ′.

Further, as shown in FIG. 75, the transmission case 6 'is disposed so as to be shifted to one of the left and right sides from the left and right central portion of the traveling vehicle 1, and the PTO transmission shaft 158 above the mating surface of the transmission case 6' is centered. The universal joint portion 159 ″ is disposed in front of the float 97 on the side in front of the PTO transmission shaft 158 and protrudes linearly behind the PTO transmission shaft 158, and bypasses the warped portion of the center float 97 to transfer power into the planted transmission frame 92. It can be configured to transmit.
Also in this case, even if the planting section 9 is raised, the center float 97 and the universal joint section 159 "are not interfered with each other, and the power transmission path can be shortened.

In any case, the rice transplanter of this embodiment is
The support structure for the wheels and the like and the power transmission configuration in the transmission case are simple, and the overall configuration of the traveling vehicle is also simplified, so that the assembly work is easy, and the weight and size are reduced without losing the rigidity. As a result, it is possible to manufacture the device at low cost without increasing the cost as a whole. In addition, various levers are also centrally arranged according to their functions, so that operability is extremely long and a rice transplanter with high safety can be realized.

[0179]

As described above, the present invention has the following advantages. That is, the side float support arm disposed below the planting portion of the rice transplanter extends rearward and downward from the fulcrum shaft connected to the planting depth setting lever, and the side float is supported at the rear end of the support arm. The support arm has a side float raising / lowering rotation restricting stopper provided at the distal end thereof, so that there is no need to dispose a member for supporting the front part of the side float. This space is opened, and the horizontal feed mechanism can be arranged, and the planting section and the seedling mounting table can be arranged in front. As a result, the planting section and the seedling mounting table can be disposed immediately behind the rear wheel, so that the overall length of the rice transplanter can be reduced, the turning radius can be reduced, and the weight balance can be improved. Also. And since the support member conventionally provided in the front part of the side float could be eliminated, the number of parts was reduced,
The cost can be reduced. Also, with a simple configuration, the vertical rotation of the side float can be regulated,
In addition, since the number of components is reduced, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a small riding rice transplanter.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is an overall plan view when a spare seedling mounting table is attached to the inside of the body.

FIG. 4 is an overall perspective view of the small riding rice transplanter when the spare seedling mounting table on the right side in the traveling direction is attached so as to face the inside of the body.

FIG. 5 is a schematic side view of a vehicle body frame and a transmission case.

FIG. 6 is a schematic plan view of the same.

FIG. 7 is a perspective view showing a state where a hood is removed.

FIG. 8 is a perspective view of a state where a bonnet and a fuel tank are disassembled.

FIG. 9 is a side view of the front part of the rice transplanter.

FIG. 10 is a plan view of a vehicle body cover and a vehicle body frame.

FIG. 11 is a plan view of a rear cover.

FIG. 12 is a plan view of a front cover.

FIG. 13 is a perspective view of a non-slip member.

FIG. 14 is a front view of the same.

FIG. 15 is a side view of an engine and an engine cover.

FIG. 16 is a partially enlarged plan view of the vehicle body frame in the same plan view, partly in section.

FIG. 17 is a schematic perspective view showing a positional relationship between a steering handle and various operation levers.

FIG. 18 is a schematic plan view showing various operation levers and an oil meter viewed from a driver's seat over a steering handle.

FIG. 19 is a schematic plan view showing various operation levers and an oil meter as viewed from a driver's seat over a steering handle.

FIG. 20 is a schematic side view of a fuel tank provided with an oil meter.

FIG. 21 is a schematic side view of a fuel tank provided with an oil meter.

FIG. 22 is a schematic perspective view showing a steering handle provided with a linear portion in a part of the outer periphery.

FIG. 23 is a schematic side view of a lifting link mechanism.

FIG. 24 is a right side view, partly in section, of a transmission case.

FIG. 25 is a planar development sectional view of a transmission case.

FIG. 26 is a developed sectional view showing a transmission gear configuration at the front of the transmission case.

FIG. 27 is a left side view of the transmission case.

FIG. 28 is a developed plane sectional view showing another example of transmission of the transmission of the transmission case.

FIG. 29 is a side sectional view showing another embodiment of the lower portion of the transmission case.

FIG. 30 is an overall side view of a rice transplanter having another embodiment of a lower portion of a transmission case.

FIG. 31 is a cross-sectional plan view showing a configuration of attaching and detaching a cover for inter-gear shifting at the front side of the transmission case.

FIG. 32 is a partial front sectional view showing a differential mechanism at a lower front part of a transmission case.

FIG. 33 is a side view showing a configuration of a refueling pipe arranged at a front part of a transmission case.

FIG. 34 is a side view showing a power connection / disconnection operation configuration for a transmission case.

FIG. 35 is a plan view, partly in section, showing the configuration of a power connecting / disconnecting operation for a transmission case.

FIG. 36 is a side view of a transmission case showing a conventional brake rod arrangement.

FIG. 37 is a side view of a lower portion of the steering shaft.

FIG. 38 is a plan view showing an interlocking configuration between a steering operation and a differential lock mechanism.

39 is a plan sectional view of the planting transmission frame 92. FIG.

FIG. 40 is a side view and a partial cross-sectional view of a connecting member.

FIG. 41 is a side view of the hitch.

FIG. 42 is a rear view of the same.

FIG. 43 is a side view of a hitch portion at the lower part of the seedling mounting table.

FIG. 44 is a perspective view of a hitch.

FIG. 45 is a view seen from the back surface of the seedling mounting table.

FIG. 46 is a side view of the seedling mounting table.

FIG. 47 is a plan view of a seedling table support frame.

FIG. 48 is a plan view of the float support.

FIG. 49 is a side view of the same.

FIG. 50 is a rear sectional view of the drive case.

FIG. 51 is a diagram showing a connected part on the back side of the seedling mounting table.

FIG. 52 is a view showing a conventional connector.

FIG. 53 is a perspective view of a connector.

FIG. 54 is a left side view of the front part of the planting frame.

FIG. 55 is a front sectional view of a vertical feed roller.

FIG. 56 is a side view of a vertical feed roller.

FIG. 57 is a schematic diagram of a seedling mounting table in which seedling mounting shoes are arranged with the left side thereof.

FIG. 58 is a schematic view of a seedling mounting table in which seedling mounting shoes are arranged with the right side thereof.

FIG. 59 is a perspective view of a vertical adjustment portion of the seedling mounting table.

FIG. 60 is a bottom view of the seedling mounting table.

FIG. 61 is a side view of a seedling mounting table.

FIG. 62 is a front view of a seedling mat presser.

FIG. 63 is an exploded perspective view of a seedling mat retainer.

FIG. 64 is a side view of the support member.

FIG. 65 is a bottom view of the seedling mat press formed integrally with all the strips.

FIG. 66 is a mounting diagram of a conventional seedling mat presser.

FIG. 67 is a mounting view of a conventional streak.

FIG. 68 is a side view of the side float support.

FIG. 69 is a plan view of the same.

FIG. 70 is a plan view of a drawing marker mounting portion on a fulcrum shaft side;

FIG. 71 is a side view of the same.

FIG. 72 is a side view showing a configuration for transmitting power to the planting section.

FIG. 73 is a plan view showing a configuration for transmitting power to the planting section.

FIG. 74 is a plan view showing a configuration for transmitting power to another type of planting section.

FIG. 75 is a plan view showing a configuration for transmitting power to another type of planting section.

FIG. 76 is a front view of a spare seedling mounting table which can be attached to the inside of the machine body.

FIG. 77 is a perspective view of a state where a bonnet and a fuel tank of another form are disassembled.

[Explanation of symbols]

 9 Planting part 79 Planting depth setting lever 98/99 Side float 161 Support shaft 162 Support arm 162a (Support arm) Stopper surface 271 Coil spring

Claims (1)

[Claims] A side float supporting arm disposed below a planting portion of a rice transplanter extends rearward and downward from a fulcrum shaft connected to a planting depth setting lever, and a side float is provided at a rear end of the supporting arm. The side float support structure is provided with a side float raising / lowering rotation restricting stopper provided at a tip end of the support arm.