JP2002335725A - Rice transplanter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate trouble in changing a car height by a loaded weight of reserve seedlings, etc., such as a structure of suspension springs 87 supported in the course of lifting and lowering of traveling wheels 5. SOLUTION: This rice transplanter is characterized by setting the force of the suspension springs 87 so that the traveling wheels 5 are kept in a normal state which is a position when lifted to the highest position in the rice transplanter liftably and lowerably equipped with the traveling wheels 5 through the suspension springs 87 in the machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice transplanter for continuously planting rice by mounting a planting section having a seedling mounting table and a planting claw on a traveling vehicle.

[0002]

Conventionally, Japanese Patent Laid-Open No. 5-13 / 1993
As shown in Japanese Patent No. 9175, there is a technique for mounting a front wheel so as to be able to move up and down by providing a suspension spring. However, when the body weight is supported while the up and down movement is in a standard state, the body tilts due to mounting of a spare seedling or a weight. And the suspension spring acts improperly, easily lowering the suspension function when turning on a headland in a field.It is difficult to maintain the aircraft horizontally necessary for rice transplanting work. There is a problem that side skid movement cannot be reduced.

[0003]

However, according to the present invention, in a rice transplanter in which traveling wheels are provided so as to be able to ascend and descend via a suspension spring with respect to the machine, the traveling wheels are positioned at the highest position relative to the machine. The suspension spring force is set so that the time is in a normal state, and it is possible to eliminate the problem that the vehicle height changes due to the mounting weight of spare seedlings and the like, such as a suspension spring structure in which the running wheel is supported during elevating and lowering, Rice transplanting can be performed while the aircraft is supported substantially horizontally inside,
The planting accuracy of the seedlings can be easily maintained, and even if there is a step such as a recess in the cultivator, the ground pressure of the running wheels can be easily secured by the grounding action of the suspension spring, and the running performance can be reduced by reducing the slip of the running wheels. Can be easily maintained.

A suspension spring is provided above a drive shaft for transmitting driving force to the running wheels, and a bearing and a holder are interposed between the drive shaft and the suspension spring. The structure for mounting the suspension spring is simplified as compared with the structure in which the suspension spring is deformed or friction due to the rotational force of the drive shaft can be easily prevented. Prevention and the like can be easily performed.

[0005] In addition, the running wheel is separated from the running wheel by a step on a running road surface so that the running wheel is in contact with the running wheel, so that the running wheel is in contact with the running wheel.
A suspension spring is provided to prevent the suspension spring from being deformed by spare seedlings or weights mounted during rice transplanting, to prevent the body from tilting due to a change in vehicle height due to changes in body weight, and to prevent road surface The meandering travel can be easily prevented by reducing the slip of the traveling wheels due to the step.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall side view, and FIG. 2 is a plan view of the same. A planting section 3 is mounted on a rear side of a traveling vehicle 1 via a link mechanism 2 so as to be able to move up and down, and is planted by the planting section 3. A side-strip fertilizer applicator 4 for burying fertilizer beside the seedlings is mounted on the rear upper surface of the traveling vehicle 1. The front and rear wheels 5, 6, a driver's seat 7, and a steering handle 8 are provided on the traveling vehicle 1. The front and rear wheels 5 and 6 are disposed below the step 9 for forming the steering wheel, the steering handle 8 is disposed on the rear side of the bonnet 10 on the front side of the step 9, and the driver's seat 7 is disposed on the upper surface on the rear side of the step 9. Also, the seedling mounting table 11 and the planting claws 12 for the five-row planting are attached to the planting section 3.
The rice planting work for continuously planting five rows of seedlings is performed, and the blower 13 blows the soil into the soil beside the five rows of seedlings via the transfer hose 14 for five rows. The fertilizer is sent from the fertilizer applicator 4 to embed the fertilizer, and at the same time, the spare seedlings of the spare seedling stand 15 on the side of the bonnet 10 are replenished to the seedling placing stand 11 so that the rice transplanting work is continued.

Further, as shown in FIGS. 3 to 15, a pair of left and right main frames 16 is provided on the traveling vehicle 1, and the front frame 17, the middle frame 18, and the rear frame 19 are connected in a substantially linear shape in a plan view. A frame 16 is formed, a gate-shaped frame 20 is fixed to the rear side of the left and right rear frames 19, and a front bumper 22 for mounting a center marker 21 and a towing hook 23 are fixed to the front sides of the left and right front frames 17. A pair of left and right step tables 2 is provided on the outside of the front and rear portions and on the outside of the front portion of the rear frame 19.
4. 25 and 26 are fixed, a long step table 27 is fixed to the entire width in the left-right direction above the middle part of the rear frame 19, and a pair of left and right step tables 28 is fixed to the upper part of the gate-shaped frame 20. A horizontal frame 30 having a table 29 is provided. The outside of each step table 24 to 26 is connected by a front side frame 31, and a rear side frame 32 is provided.
Each of the steps 26 and 27 and the horizontal frame 30
The outside is connected, and the step 9 is mounted on and fixed to the upper surface of each of the step tables 24 to 29, and the step 33 for getting on and off the vehicle is removably bolted and fixed to the outside of the rear side frame 32.

Further, as shown in FIG. 4, a pair of left and right receiving stands 34 and a frame member 35 are fixed to the left and right front frames 17 to mount an engine 36, and as shown in FIG.
The left and right front axle cases 38 are fixed to both sides of the transmission case 37, the front wheels 5 are mounted on each case 38, and the middle frame 1 for connecting the front and rear frames 17 and 19.
8 is fixed to the upper side of the case 38. A hydraulic stepless transmission case 39 for transmitting the output of the engine 36 to the transmission case 37, and a steering case 40 composed of a torque generator and a gear mechanism for amplifying the steering force of the front wheel 5 of the steering wheel 8 are fixed to the front side of the transmission case 37. At the same time, the rear axle case 42 is fixed to the rear side of the transmission case 37 via the body case 41, both sides of the portal frame 20 are fixed to the case 42, and the rear wheel 6 is mounted on the case 42. A hydraulic lifting cylinder 43 is mounted on the upper side of the machine case 41,
The piston of the cylinder 43 is connected to the link mechanism 2 that allows the cylinder 43 to move up and down.

Further, as shown in FIGS. 4 and 9, both ends of the tank base frame 44 are fixed to the front sides of the left and right rear frames 19, and the front part of the fuel tank 45 for supplying fuel to the engine 36 is fixed to the base frame 44. And left and right rear frames 19
A tank 45 is installed in between, and as shown in FIG. 3, a seat frame 46 is erected on the rear frame 19, and the driver's seat 7 is mounted on the upper side of the seat frame 46 via a seat table 47. The driver's seat 7 is arranged above. Further, a muffler 49 of the engine 36 is attached via a stay 48 to a lower surface of the left front side frame 31 supported by the left step platforms 24 and 25, and a right front side supported by the right step platforms 24 and 25. The battery stand 50 is fixed to the frame 31, and as shown in FIG.
A battery 51 for starting the engine 36 is mounted on the battery base 50, and the muffler 49 and the battery 51 are arranged separately on the lower surface of the step 9 on both sides of the engine 36.

Further, as shown in FIGS. 16 to 19, a bottom plate 52 is fixed to the bottom surface of the engine 36, and four rubber vibration isolator members 53 (front, rear, left and right) are mounted on the support 34 and the frame member 35. The left and right sides of the bottom plate 52 are fixed through the bottom plate 52, and the bearing cylinder 54 is detachably bolted and fixed to the lower right side of the bottom plate 52, and the transmission shaft 59 is rotatably supported on the bearing cylinder 54, and the pulleys 55 and 56 And belt 57
7, the front side of the transmission shaft 59 is connected to the output shaft 58 on the front side of the engine 36, and as shown in FIG. 7, the rear side of the transmission shaft 59 is connected to the input shaft 60 on the front side of the transmission case 39 so as to be separable. 36 is transmitted to the transmission case 39 via the transmission shaft 59 and the transmission case 37
The PTO shaft 61a extends rearward from the rear side to transmit power to the planting section 3, and the transmission case 37
1b is extended rearward to be input to the rear axle case 42, and power is transmitted from the transmission case 37 to the rear wheel 6 via the rear axle case 42. Further, power is transmitted from the transmission case 37 to the front wheels 5 via the front axle case 38.

Further, as shown in FIG.
The frame member 35 may be lower than the bottom surface.
The middle part is formed by bending downward, and the vibration isolating member 53 is disposed at substantially the same height as the front frame 17.
The left and right main frames 1 with the engine 36 and the driver's seat 7
6, the right and left main frames 1
6, the width of the front frame 17 is set larger than the width of the engine 36. As shown in FIG.
6, the lower portion of the engine 36 is wrapped in a side view on the front frame 17, and a ventilation space is secured between the left and right front frames 17 and both sides of the engine 36 so that the hot air around the engine 36 is smoothly discharged, and the cooling efficiency of the engine 36 is improved. And lower the engine weight by lowering the engine.

Further, both sides of a frame member 35 to which a vibration isolating member 53 for supporting the engine 36 can be attached are fixed to the front frames 17 of the left and right main frames 16, and the strength of the left and right front frames 17 is enhanced by reinforcing the frame members 35. , The engine 36 is supported by vibration damping by a high rigidity frame structure, and the mounting interval of the left and right vibration damping members 53 is increased to reduce the vibration of the engine 36 transmitted in the torsion direction of the machine. It simplifies the structure and improves the anti-vibration function of the engine 36.

Further, as shown in FIGS. 12 and 18, both sides of the gate-shaped seat plate 62 in a plan view are fixed substantially at the middle of the left and right widths of the frame member 35, and the gate-shaped middle of the seat plate 62 is positioned rearward from the frame member 35. The left and right widths of a frame member 35 which is protruded, and the seat plate 62 is removably bolted and fixed to a pedestal 63 formed on the front of the steering case 40 on the front side of the transmission case 37 and both sides are fixed to the left and right front frames 17. Intermediate transmission case 37 and steering case 4
Fixed through 0. Then, as shown in FIGS. 8 and 12, the transmission case 37 is fixed to the frame member 35, the strength of the frame member 35 is secured against the vertical vibration of the engine 36, and the left and right The strength for connecting the frame 16 and supporting the engine 36 is improved, and the rigidity of the frame member 35 in the torsion direction of the machine is improved, thereby simplifying and reducing the weight of the support structure for the engine 36, and mounting the left and right anti-vibration members 53. At approximately the center of the width, the frame member 35 and the transmission case 37
And secures the strength of the frame member 35 by fixing it to the transmission case 37 against any torsional deformation force generated in the left and right directions caused by vibration of the engine 36 and the like. Improve, etc.

As shown in FIGS. 7 and 17, a bearing cylinder 54 is detachably bolted and fixed to a lower surface side of a bottom plate 52 forming an engine stand in a separate structure, and the mounting and dismounting and mounting posture of the bearing cylinder 54 are determined. By adjusting the position, it is possible to satisfactorily perform maintenance such as replacement of the belt 57, so that the accuracy of the alignment of the belt 57 can be obtained after the engine 36 is attached, which not only improves the assembling work but also improves the tensioning accuracy of the belt 57, The life and reliability of the belt 57 are improved.

As shown in FIGS. 17 and 18, a generator 64 is provided in front of the engine 36, and
6, the generator 64 is driven by the output shaft 58, and the gantry 65 is fixed to the front side of the bottom plate 52, which is the engine pedestal, in the approximate center of the right and left widths.
To fix the generator 64 with bolts,
Since the support portion of the generator 64 is provided and attached to the engine 36 and the bottom plate 52, compared to the conventional structure in which the generator 64 is supported only by the engine 36, the strong vibration of the support member of the generator 64 is prevented against the strong vibration of the engine 36, The support members for the generator 64, such as the connecting portion between the gantry 65 and the engine 36, can be reduced in size, cost, and weight, the vibration of the engine 36, the bottom plate 52, and the like can be reduced, and the performance of the machine can be improved.

Further, as shown in FIG. 13 and FIGS. 20 to 24, left and right output cases 66 and 67 for fixing the inside of the machine to the transmission case 37, and the output cases 66 and 67
A left and right front case 68 fixed to the outside of the machine, a left and right gear case 69 slidably connected to the lower side of the front case 68, and a case cover 70 fixed to the upper side of the front case 68 In the case 38, the left and right output shafts 71 and 72 are inserted into the left and right output cases 66 and 67, and the left and right output shafts 71 and 72 are connected to the differential gear mechanism 73 of the transmission case 37. Gear output 73
To the left and right output shafts 71 and 72, the gear case 69 supports the left and right axles 74 outward, and the left and right axles 74 support the left and right front wheels 5.

Further, as shown in FIGS. 13 and 20, a knuckle arm 75 is bolted and fixed to the upper outside of the gear case 69, and is swung right and left via a torque generator or the like by rotating the steering handle 8. A steering arm 76 is provided below the steering case 40, and the left and right knuckle arms 75 are connected to the steering arm 76 via left and right tie rods 77, and the steering handle 8 is turned around a kingpin type drive shaft 78 inserted into the front case 68. The front wheels 5 are turned in proportion to the steering angle of the vehicle.

Further, as shown in FIGS. 21 and 22, the upper side of the drive shaft 78 is connected to the output shafts 71 and 72 via bevel gears 79 and 80, and the lower side of the drive shaft 78 is connected to the axle 74 by bevel gears 81 and 82. Through the output shaft 71.7
The knuckle arm 75 extends upward in parallel with the drive shaft 78, and a cylindrical sliding and rotating support portion 83 is provided above the knuckle arm 75.
And the support portion 83 of the knuckle arm 75 is slidably and rotatably fitted to the outside of the cylinder portion of the case cover 70, and the gear case 69 and the case cover 70 are inserted.
The knuckle arm 75 is supported at both ends.

A drive shaft 78 on which a bevel gear 81 is provided.
The lower part of the drive shaft 7 is supported on the gear case 69 by a bearing 84 and the bevel gear 80 is spline-fitted.
8, the lower surface of the piston-type holder 85 is supported by a bearing 86, and the upper surface of the holder 85 is contacted with a large-diameter and small-diameter compression coil spring-type suspension spring 87 to slide the holder 85 in the vertical direction. A suspension spring 87 is provided in the cylinder portion of the case cover 70 to be moved, and the front wheel 5 is elastically pressed downward by the suspension spring 87 via the drive shaft 78 and the gear case 69.
The ground pressure of the front wheel 5 is maintained by the spring 87.
Is inserted into the center of the spring 87, the spring 87 is maximally compressed by the weight of the vehicle 1 and the spring 87 is brought into close contact with the vehicle 5 in a normal state where the four wheels 5 and 6 are in contact with the ground, and the vehicle height is kept constant. On the other hand, when the vehicle is traveling on a step where one of the left and right rear wheels 6 and one of the left and right front wheels 5 is in contact with the ground, the front wheel 5 is lowered by extension of the suspension spring 87, and the ground pressure of the front wheel 5 is maintained to prevent slip.

Further, as shown in FIGS. 23 and 24, a stopper 89 is integrally formed inside the knuckle arm 75,
Left and right turning restricting protrusions 90 and 91 are integrally formed on the front and rear outer sides of the front case 68, and the stopper 89 is brought into contact with one of the protrusions 90 and 91 by the maximum steering angle operation of the steering handle 8, so that the front wheel 5 The stopper 89 is formed to be substantially equal to or longer than the sliding range (suspension stroke) of the gear box 69 and the knuckle arm 75 due to the expansion and contraction of the suspension spring 87, and the knuckle arm 75 is formed by the front spring 87. The stopper 89 is configured to be able to abut the protrusions 90 and 91 in the entire range in which the slider slides. In addition, as shown in FIG.
8 are provided with stoppers 89 on both the left and right protrusions 90 and 91.
Alternatively, the turning of the front wheel 5 may be restricted.

As is apparent from the above description, a gear box 69 for mounting the front wheel 5 is provided below the front case 68 connected to the machine to form a front axle case 38 and a drive shaft 78 serving as a king pin. The gear box 69 is rotatable and vertically slidable.
In the rice transplanter, a suspension spring 87, which is an elastic member for elastically pressing the gear box 69 downward, is provided inside the case cover 70 on the upper side of the front case 68, and the other side of the knuckle arm 75 for fixing one side to the gear box 69. Is slidably supported by the case cover 70. The upper and lower sides of the knuckle arm 75 are firmly supported by a two-sided structure, and the sliding connection portion of the front case 68 and the gear box 69 can be firmly supported against a deformation force in a falling direction or a torsion direction, For example, the strength required for supporting the front wheel 5 is ensured without increasing the shaft diameter of the drive shaft 78, which is a kingpin, so that the structure of the front axle case 38 in which the front wheel 5 is provided is reduced in weight and the manufacturing cost is reduced. Spring 8
The knuckle arm 75 is slid on the outside of the case cover 70 provided with the inside 7 to arrange the suspension structure in a space-saving manner.

Further, a stopper 89, which is a rotation restricting member corresponding to at least the vertical sliding range of the gear box 69, is provided inside the knuckle arm 75, and the stopper 89 is arranged in a space-saving manner. Alternatively, the stopper 89 is formed by also using the front case 68 and the like, the number of components is reduced by sharing the components, and the strength of the stopper 89 necessary to restrict the rotation of the gear box 69 around the drive shaft 78 is reduced. It is easy to obtain, and the downward sliding of the gear box 69 is restricted by the contact between the case cover 70 or the front case 68 side and the lower surface side of the support portion 83 of the knuckle arm 75.
A stopper such as a retaining ring when the front case 68 and the gear box 69 are fully extended becomes unnecessary, and there is no need to provide a special stopper component for restricting the extension operation of the gear box 69, and simplification of the gear box 69 support structure, etc. Do
In addition, a stopper structure that is advantageous in strength can be obtained by using the knuckle arm 75 having high rigidity, thereby reducing manufacturing costs and improving durability.

Further, the front wheels 5 which are running wheels for the machine
In a rice transplanter in which the front wheels 5 can be moved up and down via the suspension spring 87 so that the front wheel 5 is located at the highest position with respect to this machine in a normal state.
The force is set, and the problem that the vehicle height changes due to the mounting weight of the spare seedlings or the like as in the case of the suspension spring 87 structure in which the front wheel 5 is supported during ascent and descent is eliminated, and the vehicle is supported substantially horizontally in the field. By performing rice transplanting work, the planting accuracy of the seedlings is maintained, and even if there is a step such as a recess in the tillage, the grounding pressure of the front wheel 5 is secured by the grounding action of the suspension spring 87, and the slip of the front wheel 5 is reduced to improve running performance. And a suspension spring 87 is provided above the drive shaft 78 for transmitting the driving force to the front wheels 5.
A bearing 86 and a holder 85 are interposed between the suspension spring 87 and the suspension spring 87, for example, the mounting structure of the suspension spring 87 is simplified as compared with a structure in which the suspension spring 87 is wound around the drive shaft 78, and the suspension spring The deformation or friction of the spring 87 is prevented, and the support surface of the suspension spring 87 by the holder 85 is widened to prevent the spring 87 from falling down.

Also, the front wheel 5 is brought into contact with the front wheel 5 by a step height of the traveling road surface so that the front wheel 5 is separated from the machine and the front wheel 5 is brought into contact with the ground.
A suspension spring 87 is provided to prevent the suspension spring 87 from being deformed by spare seedlings or weights mounted at the time of rice transplanting, to prevent the body from tilting due to a change in vehicle height due to a change in the weight of the vehicle body, and a step on a road surface. To prevent the front wheel 5 from slipping, thereby preventing meandering travel.

Further, as shown in FIG. 22, an output shaft 72 is supported by a bearing 92 on the outside of the output case 67 to which the front case 68 is fixed, and a boss 93 of a bevel gear 79 provided inside the front case 68 is output. It extends in the direction of the shaft 72, and the end face of the boss portion 93 is brought into contact with the bearing 92 so as to receive the thrust load of the bevel gear 79, thereby eliminating the need for a collar for receiving the thrust load of the bevel gear 79 and reducing the number of parts. In addition, the processing dimension error in the direction of the output shaft 72 also serving as the differential shaft can be reduced, and the backlash of the bevel gear 79 can be properly secured. Also, the uppermost part of the case cover 70 for receiving the suspension spring 87 is brought close to the lower surface side of the step 9, and the spring 87
A rubber support member 70a for step 9 is provided on the head of the case cover 70, which is the receiving part of the case cover, so that the case cover 70 can be used as a step 9 attachment member, and a stay for supporting the step 9 is omitted to reduce the number of parts. In addition, both the step 9 and the main frame 16 are supported by the front axle case 38, and the step 9 is supported with high rigidity.

[0026]

As is apparent from the above embodiments, the present invention relates to a rice transplanter in which the running wheel 5 is provided to the machine so as to be able to move up and down via a suspension spring 87. The suspension spring 87 force is set so that the vehicle is in a normal state when the vehicle is elevated, and the vehicle height is increased by the mounting weight of the spare seedlings and the like as in the suspension spring 87 structure in which the running wheel 5 is supported during the ascent and descent. The problem of change can be eliminated, rice transplanting can be performed in a state where the machine is supported substantially horizontally in the field, the accuracy of planting seedlings can be easily maintained, and there are steps such as recesses in the cultivator. Also, the ground pressure of the running wheel 5 can be easily secured by the grounding action of the suspension spring 87, and the slip of the running wheel 5 can be reduced to easily maintain the running performance.

A drive shaft 7 for transmitting a driving force to the traveling wheels 5
8, a suspension spring 87 is provided between the drive shaft 78 and the suspension spring 87.
And a holder 85, for example, a drive shaft 78
The structure for mounting the suspension spring 87 is simplified as compared with the structure in which the suspension spring 87 is wound around the outside, and deformation or friction of the suspension spring 87 due to the rotational force of the drive shaft 78 can be easily prevented. , The spring 87 can be easily prevented from falling down.

A suspension spring is provided so that the traveling wheel 5 is separated from the traveling wheel 5 by the step height of the traveling road surface so that the traveling wheel 5 is in contact with the traveling wheel 5 due to the weight of the vehicle body. 87 to prevent the suspension spring 87 from being deformed by spare seedlings or weights to be mounted during rice transplanting, to prevent the body from tilting due to a change in vehicle height due to changes in body weight, and to provide a step on the road surface. And the meandering traveling can be easily prevented by reducing the slip of the traveling wheel 5 due to the above.

[Brief description of the drawings]

FIG. 1 is an overall side view.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is an explanatory side view of the traveling vehicle.

FIG. 4 is a plan view of a main frame portion.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a side view of a transmission case.

FIG. 7 is a side view of the engine transmission.

FIG. 8 is a plan view of FIG. 7;

FIG. 9 is a perspective view of a vehicle body equipped with an engine.

FIG. 10 is an enlarged view of FIG. 9;

FIG. 11 is a perspective view of a vehicle body equipped with a transmission case.

FIG. 12 is an enlarged view of FIG. 11;

FIG. 13 is a perspective view of a traveling transmission unit.

FIG. 14 is a perspective view of a front portion of a main frame.

FIG. 15 is an enlarged view of FIG. 14;

FIG. 16 is a top perspective view of the engine unit.

FIG. 17 is a bottom perspective view of the engine unit.

FIG. 18 is a front view of an engine unit.

FIG. 19 is a plan view of an engine unit.

FIG. 20 is an explanatory front view of a front axle case.

FIG. 21 is a sectional view of a left front axle case.

FIG. 22 is a sectional view of a left front axle case.

FIG. 23 is an enlarged view of FIG. 21;

FIG. 24 is an explanatory plan view of FIG. 23;

FIG. 25 is a plan view showing a modification of FIG. 24;

[Explanation of symbols]

 5 Front wheel 78 Drive shaft 85 Holder 86 Bearing 87 Suspension spring

Continued on the front page (72) Inventor Hideki Matsuoka 1-32 Chaya-cho, Kita-ku, Osaka-shi Yanmar Agricultural Machinery Co., Ltd. F-term (reference) 2B063 AA04 AB01 BA05 BA11 3D001 AA08 AA17 AA18 CA07 DA01 3D043 AA04 AB12

Claims (3)

[Claims] 1. In a rice transplanter having a traveling wheel that can be raised and lowered via a suspension spring with respect to the machine, a suspension spring is provided so that the traveling wheel is at its highest position relative to the machine in a normal state. Rice transplanter characterized by setting power. 2. The rice plant according to claim 1, wherein a suspension spring is provided above the drive shaft for transmitting the driving force to the running wheels, and a bearing and a holder are interposed between the drive shaft and the suspension spring. Machine. 3. A suspension spring is provided so that the traveling wheel is separated from the traveling wheel by a step on a traveling road surface so that the traveling wheel is grounded by setting a minimum vehicle height state in which the traveling vehicle and the traveling wheel are closest to each other due to the weight of the vehicle body. The rice transplanter according to claim 1, characterized in that: