JP2010172234A5 - - Google Patents

Description

Seedling planting machine

It relates to a seedling planting machine .

  A technology is known in which the output shaft of the rear wheel transmission case and the input shaft of the rotor transmission case are connected by an expansion / contraction interlocking shaft having a hexagonal cross section to drive the substitution rotor (for example, see Patent Document 1). ing.

JP 2007-300873 (page 6, FIG. 5).

In a form in which the cutting rotor provided on the front side of the float of the seedling planting device is extended and retracted from the output shaft on the rear wheel transmission case side of the traveling vehicle body via the expansion and contraction interlocking shaft, this expansion and contraction interlocking shaft is placed on the soil surface. It is close to the rear wheel rotation area of the vehicle body and the rotation area of this bearing rotor, etc., and it is easy to receive mud, water, etc., and it is difficult to maintain a smooth transmission drive state. Moreover, in order to perform these waterproofing and mudproofing, it becomes easy to become a complicated structure.
It is an object of the present invention to make it possible to easily cross the heel with the front grip and to be retracted from the irradiation area of the headlamp when it obstructs the headlamp. Another object is to maintain a smooth transmission state for a long time.

The invention according to claim 1, connected NaeUe device (2) behind the vehicle body (1), provided rotatably grip stay (77) to the front end of the vehicle body (1) to the longitudinal direction The grip stay (77) is provided with a grip bar (79) projecting to the left and right sides, a grip shaft (82) is provided on the top of the grip stay (77), and the front grip (75) is centered on the grip shaft (82). ) and seedling planting machine, characterized in that the provided rotatably in the front-rear direction.

The invention according to claim 2 is provided with a scraping rotor (4) that scrapes the soil surface on the front side of the float (3) that slides on the soil surface while supporting the seedling planting device (2), A spline interlocking shaft (12) comprising a telescopic spline shaft (10) that is transmitted from (1) to the scraper rotor (3) and a spline cylinder shaft (11) into which the spline shaft (10) is inserted; The seedling according to claim 1, further comprising an interlocking shaft boot (15) that covers the outer periphery of the air breather hole (13) of the spline cylinder shaft (11) and forms a first boot chamber (14). A planter .

The invention according to claim 3 is provided with an expansion boot (16) that covers the outer periphery of the spline shaft (10) to form a second boot chamber (17), and the interlocking shaft boot (15) and the expansion boot (16). And the first boot chamber (14) and the second boot chamber (17) communicate with each other .
The invention according to claim 4 is provided with a rear wheel transmission case (6) for supporting the rear axle (5) of the traveling vehicle body (1), and is transmitted from the rear wheel transmission shaft case (6) to the spline shaft (10). The spline cylinder shaft (11) is configured to transmit to the rotor transmission case (8) of the scraper rotor (4), and the second air breather hole (18) formed at the upper end of the spline shaft (10) The boot plant (14) and the second boot chamber (17) are configured to communicate with each other.

According to the first aspect of the present invention, the front grip 75 can easily cross the heel, and when the headlamp 81 is obstructed, it can be retracted from the irradiation area of the headlamp 81.
In the invention according to claim 2, by forming the first boot chamber 14 on the outer periphery of the spline interlocking shaft 12 and providing the interlocking shaft boot 15, the rotational diameter of the outer periphery of the interlocking shaft 12 is slightly increased. It is possible to simplify the configuration, prevent suction of mud or mud water from the air breather hole 13, and maintain a smooth transmission state for a long time.

In the invention according to claim 3 , the interlocking shaft boot 15 around the spline shaft 11 and the telescopic boot 16 around the spline shaft 10 are integrally connected, and these boot chambers 14 and 17 are communicated with each other. The outer peripheral configuration is simplified, the air tightness is increased, the volume in the boot chambers 14 and 17 is enlarged, the resistance of intake and exhaust from the air freezer hole 13 is reduced, and the outer peripheral portions of the boot chambers 14 and 17 Therefore, it is possible to enhance the effect of preventing the intake and exhaust of the air, and to maintain the smooth transmission drive of the scraper rotor 4.

Since the second air breather hole 18 is formed in the upper end portion of the spline interlocking shaft 12, the interlocking shaft boot 15 or the telescopic boot 16 is reduced for some reason by reducing the scattering of mud and muddy water. Even if the outside air is easily sucked into the second air breather hole 18 due to damage or the like, it is difficult to perform direct scattering and suction into the second air breather hole 18 of the mud or muddy water . it can. When oil is transmitted into the spline cylinder shaft 11 for transmission, oil mist is ejected by the air blown from the second air breather hole 18 at the upper end of the spline shaft 10, and the outer peripheral surfaces of the boots 15 and 16. The spline engagement shaft 12 can be lubricated and the spline interlocking shaft 12 can be expanded and contracted smoothly without oil contamination.

The side view of the transmission apparatus part which drives a scraper rotor. The plan view. The cross-sectional view which shows the expansion-contraction operation | movement of a spline interlocking | shaft axial part. The side view of a seedling transplanter. The plan view. The plane sectional view which shows the expansion-contraction operation | movement of the spline interlocking | linkage shaft part which shows a part another example. The top view of the transmission apparatus part which drives the scraper rotor which shows a part another example. The cross-sectional view which shows the expansion-contraction operation | movement of the spline interlocking | shaft axial part. The side view of the trunnion arm part of a hydraulic continuously variable transmission, and a partial perspective view. The side view of the speed-change lever part which shows the other example, and the top view of a lever guide part. The side view which shows the operating state of a front grip part. The front view.

  Based on the drawings, the seedling planting device 2 can be steered by a steering handle 20 and is a four-wheel traveling type vehicle body 1 having a front wheel 23 and a rear wheel 24 that are driven by an engine 22 mounted under a driver's seat 21. It is connected to the rear side through a lift link 25 in the form of a parallel link so as to be movable up and down. The seedling planting device 2 has an input shaft 26 that is interlocked with the PTO shaft on the vehicle body 1 side, and is internally interlocked with the input shaft 26 so that the seedling tank 27, the seedling feeding belt 28, and the seedling planting are connected. A seedling planting transmission case 30 having a transmission mechanism that interlocks with the attached claws 29 and the like is constructed, and the seedling planting transmission case 30 is a main body, and a float 3 composed of a center float and side floats on both the left and right sides is formed on the lower side. Arranged so that the direction angle is freely swingable, and on the upper side, a seedling tank 27 in a multi-row planting form on which a seedling grown in a mat shape is placed and fed to the lower rear side is supported so as to be able to reciprocate left and right. On the rear side, the seedlings that are moved up and down to an elliptical planting trajectory line D and separated and held from the outlet 31 of the seedling tank 27 are planted in a multi-row form on the soil surface leveled by the float 3. A seedling planting nail 29 is provided.

  The seedling planting device 2 controls the lift link 25 to move up and down by the expansion and contraction of the lift cylinder 32 of the vehicle body 1 so that the seedling planting depth with respect to the soil surface by the seedling planting claws 29 is maintained constant. This lift control is performed by detecting the vertical swing angle of the center float portion of the float 3 and switching the lift control valve of the hydraulic circuit for extending and retracting the lift cylinder 32. In addition, the seedling planting device 2 is provided so as to be capable of turning right and left around a rolling shaft attached to the lift link 25 so as to be capable of rolling control. The substitution rotor 4 is arrange | positioned in the front side of such a seedling planting device 2, and the front stroke part of the soil surface where the float 3 slides is leveled. This scraper rotor 3 is arranged separately for each center float part and side float part as a center rotor part on the front side and side rotor parts on the left and right side parts, and the center rotor part is the center float part. The front protrusion length is set to be longer than the side rotor portion in accordance with the configuration in which the front protrusion length is set longer. A rotor frame 34 in which the scraper rotor 3 is rotatably mounted by a rotor shaft 33 is provided so as to be vertically adjustable with respect to a seedling planting frame 35 provided in a seedling planting transmission case 30 of the seedling planting device 2, The position of the bearing rotor 4 can be adjusted up and down or controlled.

  The traveling vehicle body 1 is provided with auxiliary seedling receiving frames 37 at the left and right outer portions of the front end portion of the floor 36 so that the seedling tank 27 of the rear seedling planting device 2 can be replenished with seedlings while taking out the seedlings from the mounted seedling box in advance. . Further, a fertilizer device 38 is provided on the rear side of the driver's seat 21, and fertilizer is fed down to the soil leveling position of the float 3 and the fertilizer grooving device 40 position through the fertilizer hose 39, and seedling planting Fertilizer can be applied to the attached position.

  A hydraulic continuously variable transmission 41 and a transmission case 42 are provided on the front side of the engine 22, and the front wheel 23 is transmitted from the transmission mechanism of the transmission case 42, and both the left and right rear wheels are connected via a differential gear mechanism. The interlocking shaft 43 connected over the transmission case 6 is transmitted, and the input shaft 26 of the seedling planting device 2 and the PTO shaft 44 interlocking with the input shaft of the fertilizer application device 38 are transmitted.

  The float 3 and the center rotor portion and the center rotor portion of the scraper rotor 4 are arranged so as to pass through the central portion between the left and right rear wheels 24 of the vehicle body 1. It arrange | positions in the back side part of 24 steps, and it is set as the form which levels the soil surface which was stepped on by this rear wheel 24. The scraper rotor 4 is disposed so as to project the rotor shaft 33 toward the inside (right) side of the front end of the chain case 45 and the outside (left) side of the rear end, and rotates around the rotor shaft 33. And soak the soil surface. A rotor transmission case 8 is provided on the outer side of the rear end of the chain case 45, an input shaft 9 having a universal joint is mounted on the front side, and the rotor shaft 33 of the side rotor portion is transmitted from the input shaft 9 via a bevel gear 46. To drive. Further, the rotor shaft 33 of the center rotor portion mounted on the inner side of the front end of the chain case 45 is rotated by being transmitted from the rotor shaft 33 of the side rotor portion to the chain 47.

  An output shaft 7 is projected downward from the rear wheel transmission case 6 on the left side portion around which the rear wheel 24 is mounted, and the rotor transmission is transmitted from the rear output shaft 7 via the spline interlocking shaft 12. It connects so that it may interlock with the input shaft 9 of case 8. Therefore, the right side rotor shaft portion is transmitted through a chain 47 in a chain case 45 disposed on the right side of the center rotor portion.

  Further, the center rotor portion is configured to rotate independently on both the left and right sides of the center line L of the center rotor shaft portion, and the chain 47 of the chain case 45 provided on the outside is separately provided, and the left and right rear wheel transmissions. The center line L is configured to be subject to right and left so as to be separately transmitted from the case 6 via the spline interlocking shaft 12.

  As described above, the rotor cover 48 is provided on the upper surface of the scraper rotor 4 that is mounted on the inner and outer sides of the chain cases 45 on both the left and right sides, and is suspended through the rotor frame 34 or the spring 49. .

Here, a scraping rotor 4 for scraping the soil surface is provided on the front side of the float 3 that slides on the soil surface while supporting the seedling planting device 2 connected to the rear of the traveling vehicle body 1. A telescopic spline shaft 10 for interlocking with the input shaft 9 of the rotor transmission case 8 of the scraper rotor 3 from the output shaft 7 of the rear wheel transmission case 6 that mounts the axle 5, and the spline shaft 10 A spline interlocking shaft 12 comprising a spline cylinder shaft 11 to be inserted is provided, and an interlocking shaft boot 15 is provided on the outer peripheral surface of the air breather hole 13 of the spline cylinder shaft 11 so as to cover and cover the outer peripheral surface. It is set as the structure of the substitute rotor transmission device of the characteristic seedling transplanter.
During seedling work, the input shaft 9 of the rotor transmission case 8 is transmitted from the output shaft 7 of the rear wheel transmission case 5 of the traveling vehicle body 1 through the spline interlocking shaft 12 formed by the spline shaft 10 and the spline cylinder shaft 11. Then, the cutting rotor 4 is rotationally driven, and the sliding front part of the float 3 of the seedling planting device 2 is scraped and leveled. When the scraper rotor 4 swings up and down during the transmission drive of the scraper rotor 4, the spline insertion portion between the spline shaft 10 and the spline cylinder shaft 11 slides back and forth to maintain the transmission state. . At this time, the internal air is sucked into and discharged from the outer boot chamber 13 through the air breather hole 13 by the pump action in the spline cylinder shaft 11 on which the spline shaft 10 slides. At this time, since the boot chamber 14 is formed with an appropriate space capacity, even if the air in the spline cylinder shaft 11 is sucked and discharged from the air freezer hole 13, the suction and discharge resistance is reduced, and the spline shaft 10 is expanded and contracted. The interlocking shaft boot 15 covering the boot chamber 14 is reduced in pressure expansion and contraction, and the airtightness of the interlocking shaft boot 15 is maintained over a long period of time. In this way, the outer peripheral portion of the air breather hole 13 forms a boot chamber 14 with an appropriate interval and is covered with the interlocking shaft boot 15, so that mud, muddy water or the like is prevented from being sucked into the air breather hole 13, adsorbed, etc. Smooth transmission drive of the scraper rotor 4 and expansion / contraction of the spline interlocking shaft 12 are performed.
Further, in the transmission drive of the scraper rotor 4 by the spline interlocking shaft 12, the expansion / contraction boot 16 covering the outer periphery of the spline shaft 10 is synchronously expanded / contracted by the expansion / contraction of the spline interlocking shaft 12, and the boot chamber in the expansion / contraction boot 16. Scale 17 volumes. For this reason, the air sucked and discharged from the air breather hole 13 into the boot chamber 14 of the interlocking shaft boot 15 and into the boot chamber 17 of the telescopic boot 16 is absorbed into the series of boot chambers 14 and 17 to be expanded and contracted. As a result, the resistance to intake and exhaust is reduced, the outside of the interlocking shaft boot 15 and the outer periphery of the telescopic boot 16 are prevented from sucking and discharging outside air, and the expansion and contraction of the spline interlocking shaft 12 and the transmission rotation of the scraper rotor 3 are smoothly performed. Make it. Further, in the transmission drive of the scraper rotor 4 by the spline interlocking shaft 12, the spline interlocking shaft 12 can be transmitted while being oiled in the spline cylindrical shaft 11. The air is sucked and discharged from the air breather hole 18 at the upper end portion of the spline shaft 10 to the outer boot chamber 17, and the oil mist sprayed from the air breather hole 18 is sprayed on the spline fitting sliding portion on the outer periphery of the spline shaft 10. Lubricate. At this time, since the outer periphery of the spline interlocking shaft 12 is covered with the elastic boot 16, the oil leakage to the outside can be prevented.

  The spline interlocking shaft 12 is connected to the rear wheel transmission case 6 located inside the left rear wheel 24 of the vehicle body 1 and the rear rotor transmission case 8 so as to be inclined downwardly at the rear end. The spline cylinder shaft 11 at the rear end of the spline interlocking shaft 12 is made to approach along the outside of the chain case 45. The spline shaft 10 which is inserted into and slides on the front end side of the spline tube shaft 11 and expands and contracts is located higher than the spline tube shaft 11 and is spaced apart from the soil surface, and is capable of scattering muddy water and the like. It is in an unacceptable form. The output shaft 7 and the input shaft 9 of the spline interlocking shaft 12 form a universal joint, and flexibly interlock with the vertical swinging corresponding to the soil surface height change of the scraper rotor 4. Rotating transmission.

The spline shaft 10 is inserted into the spline cylinder shaft 11 and is slid in this axial direction so that it can expand and contract. The interlocking shaft boot 15 covering the outer peripheral portion of the spline cylinder shaft 11 is formed in a cylindrical shape from a rubber material or the like, and forms a boot chamber 14 with an appropriate interval between the outer peripheral surface of the spline cylinder shaft 11. The volume of the boot chamber 14 is formed to be substantially the same as the internal volume of the spline cylinder shaft 11 when the spline shaft 10 is extended, and is communicated with the spline cylinder shaft 11 through an air breather hole 13 formed. Yes. The throttle port portions 50 and 51 at the upper and lower ends of the interlocking shaft boot 15 are fitted into the outer peripheral surface of the cylindrical spline tube shaft 11 in an airtight manner. Further, the expansion boot 16 provided to cover the outer peripheral surface of the spline shaft 10 part is configured to be able to expand and contract in the form of a bellows with a rubber material, and has throttle openings 52 and 53 at the upper and lower ends, and the spline shaft 10 and the outer peripheral portion of the metal 55 fitted to the upper end outer peripheral portion 54 or the upper end portion of the spline cylinder shaft 11 are hermetically fitted. The air breather hole 13 is formed on the lower end side of the spline cylinder shaft 11 so as to communicate between the inside of the spline cylinder shaft 11 and the outer boot chamber 14, and compressed air generated by pushing the spline shaft 10 is supplied to the cylinder shaft 11. The air in the boot chamber 14 flows from the inside to the boot chamber 14 side or is drawn out upward of the spline shaft 10 and is sucked into the cylindrical shaft 11. The air breather hole 13 can also be formed on the upper end side of the spline cylinder shaft 11.

  The interlocking shaft boot 15 may fix the upper and lower cuffs 50 and 51 to the outer peripheral surface of the spline cylinder shaft 11 and can slide in the vertical directions C and D as shown in FIG. The outer periphery of the air breather hole 13 formed at the lower end position of the spline cylinder shaft 11 is positioned in the boot chamber 14 or the outer periphery of the air breather hole 13 formed at the upper end position of the spline cylinder shaft 11 is configured. It can be set as the form located in the boot chamber 14.

  Next, mainly based on FIG. 7, an interlocking shaft boot 15 that covers the outer periphery of the spline cylinder shaft 11 of the spline interlocking shaft 12, and an elastic boot that covers the outer periphery of the spline shaft 10 and forms an elastic boot chamber 17. 16 is connected to and integrated with each other. In the transmission drive of the scraper rotor 4 by the spline interlocking shaft 12, the expansion / contraction boot 16 covering the outer periphery of the spline shaft 10 is synchronously expanded / contracted by the expansion / contraction of the spline interlocking shaft 12, and the volume of the boot chamber 17 in the expansion / contraction boot is determined. Scale. For this reason, the air sucked and discharged from the air breather hole 13 into the boot chamber 14 of the interlocking shaft boot 15 and into the boot chamber 17 of the telescopic boot 16 is absorbed into the series of boot chambers 14 and 17 to be expanded and contracted. As a result, the resistance to intake and exhaust is reduced, the outside of the interlocking shaft boot 15 and the outer periphery of the telescopic boot 16 are prevented from sucking and discharging outside air, and the expansion and contraction of the spline interlocking shaft 12 and the transmission rotation of the scraper rotor 3 are smoothly performed. Make it. The connecting portion 56 between the upper end of the interlocking shaft boot 15 and the lower end of the telescopic boot 16 does not form the throttle port portions 50 and 53 as described above, but between the connecting portion 56 and the inner metal 55 peripheral surface. An appropriate gap is formed between the boot chambers 14 and 17 so as to allow the air in the boot chambers 14 and 17 to flow freely.

  Next, mainly based on FIG. 8, the spline shaft 10 is connected to the output shaft 7 of the rear wheel transmission shaft case 6, and the spline cylinder shaft 11 is connected to the input shaft 9 of the rotor transmission case 8. An air breather 18 is formed at the upper end of the air blower 10. In the transmission drive of the scraper rotor 4 by the spline interlocking shaft 12, the spline interlocking shaft 12 can be transmitted in a state where oil is supplied into the spline cylindrical shaft 11. The air is sucked into and discharged from the air breather hole 18 at the upper end of the spline shaft 10 into the outer boot chamber, and the oil mist ejected from the air breather hole 18 is sprayed on the spline fitting sliding portion on the outer periphery of the spline shaft 10 for lubrication. Let At this time, since the outer periphery of the spline interlocking shaft 12 is covered with the elastic boot 16, the oil leakage to the outside can be prevented.

  A hole path 57 is formed along the central portion of the spline shaft 10, and the shaft lower end portion of the hole path 57 is in open communication with the cylinder chamber 58 of the spline cylinder shaft 11. Since the outer peripheral portion of the spline shaft 10 is covered with the elastic boot 16, when the spline shaft 10 is pulled upward from the metal 55 portion at the upper end of the spline cylinder shaft 11, the air breather hole 18 of the spline shaft 10 is The boot chamber 17 communicates with the boot chamber 14 of the interlocking shaft boot 15 via the air breather hole 18, the hole passage 57, the cylinder chamber 58, the air bleed hole 13, and the like. You can communicate. The air breather hole 13 of the spline cylinder shaft 11 can be set as high as possible in order to store the oil supply in the cylinder chamber 58. The oil supply into the cylinder chamber 58 can be lubricated through the air breather hole 18 by turning the upper end of the telescopic boot 16 to expose the air breather hole 18 of the spline shaft 10. Further, the interlocking shaft boot 15 can be moved up and down to expose the air breather hole 13 and lubricate from the air breather hole 13.

In such a form, it is possible to adopt a configuration in which the air breather hole 13 of the spline cylinder shaft 11 and the interlocking shaft boot 15 are not provided.
Next, in the hydraulic continuously variable transmission 41 driven from the engine 22 mainly based on FIG. 9, a clip pin is attached to the tip of the trunnion arm 61 that is integrally attached to the trunnion shaft 60 for continuously variable speed operation. A sliding contact surface 63 for sliding 62 and a clip hole 64 are formed at the center of the sliding contact surface 63. The clip pin 62 protrudes toward the clip hole 64 from a stay 65 fixed to the machine body, and is ejected through a spring 66. The head end surface of the clip pin 62 is formed in a spherical shape, and when the clip pin 62 matches the clip hole 64 of the trunnion arm 61, the clip pin 62 is slightly fitted into the clip hole 64 to generate a clicking sound. . Thus, when the trunnion arm 61 is operated to the forward movement position and the reverse movement position, the head of the clip pin 62 is brought into sliding contact with the sliding contact surface 63, but when the trunnion arm 61 is rotated to the neutral position. The clip pin 62 is engaged with the clip hole 64. In this way, when the trunnion arm 61 is operated to the neutral position, the clip pin 62 is engaged with the clip hole 64, and an engagement sound is generated to improve the operation feeling and improve the operability. When the trunnion arm 61 is operated to the forward movement position or the reverse movement position, the position of the clip hole 64 with respect to the clip pin 62 is disengaged, and smooth shifting guidance is performed by sliding contact guidance with the sliding contact surface 63.

  Next, mainly based on FIG. 10, a shift lever 67 for operating the trunnion shaft 60 is supported by a bracket 68 so as to be swingable at a neutral position N, and the bracket 68 is provided to be rotatable around a shaft tube 69. Thus, the trunnion shaft 60 can be operated from the neutral position N to the forward (high speed) position F or the reverse (high speed) position R by operating the speed change lever 67 in the front-rear direction. The shaft cylinder 69 is provided on the arm plate 70 and is fixed to the airframe. A clip hole 64 is formed on the upper side of the shaft tube 69, and the head of the clip pin 62 pushed out from the bracket 68 through the spring 66 is connected to the outer peripheral sliding contact surface 63 of the shaft tube 69 and the clip. Slide into hole 64. When the shift lever 67 is operated to the forward position F or the reverse position R of the lever guide 71, the clip pin 62 slides on the sliding contact surface 63 so that the shift lever 67 is smoothly operated. When the speed change lever 67 is operated to the neutral position N, the clip pin 62 engages with the clip hole 64 to generate an engagement sound.

  Further, a stopper plate 72 is provided at the bracket 68 portion where the clip pin 62 engages, and when the speed change lever 67 is operated to a position other than the neutral position N, the clip plate 62 is interfered by the stopper plate 72. Thus, the shift lever 67 at the forward position F is prevented from being rotated to the reverse position R. At this time, when the clip pin 62 engages with the clip hole 64, the clip pin 62 is removed from the interference with the stopper plate 72, and the shift lever 67 is allowed to be operated from the neutral position N to the reverse position R.

  Next, mainly based on FIGS. 11 and 12, the front grip 75 can be folded and stored at the front end of the traveling vehicle body 1. The front grip 75 lifts and lifts the front portion of the vehicle body 1 when traveling over the coast and makes it easy to cross the heel. The front bracket 76 at the front end of the traveling vehicle body 1 is provided with a gate-shaped grip stay 77 that can be pivoted back and forth around the stay shaft 78, and the grip stay 77 extends over both the left and right sides. Bar 79 is formed. The grip stay 77 is set at substantially the same height as the headlamp 81 of the steering post 80 at the front end of the floor 36, and the left and right ends of the front grip 75 formed in a U shape are formed at the upper end. Is supported so that it can be swung up and down around the grip shaft 82, and has a stopper 83, so that the front grip 75 can be turned upright A with respect to the grip stay 77, or the left and right slip stays 77 can be rotated. The storage can be rotated B by being positioned between them.

  When the front grip 75 is used, it is turned upright A, and when the front grip 75 is not needed, it is turned up. Further, when changing these front and rear inclination angles, the front and rear are rotated about the stay shaft 78. When the grip bar 79 is in the way of the headlamp 81, the grip stay 77 in the storage rotation B posture is appropriately rotated to the front side and retracted from the irradiation area of the headlamp 81 downward.

  Further, when the overgrip operation is performed using the front grip 75, the grip bar 79, etc., the trunnion shaft 60 of the hydraulic continuously variable transmission 41 of the auto accelerator is slightly returned to increase the rotation of the engine 22 by the throttle. Can be configured to compensate for the lack of output. Further, the stand-up rotation A of the front grip 75 or the like can also be configured to prevent the reduction in the rotation of the engine 22 by raising the idling at the same time as turning off the differential lock of the mission case 42.

DESCRIPTION OF SYMBOLS 1 Traveling body 2 Seedling planting device 3 Float 4 Scratch rotor 5 Rear axle 6 Rear wheel transmission case 7 Output shaft 8 Rotor transmission case 9 Input shaft 10 Spline shaft 11 Spline cylinder shaft 12 Spline interlocking shaft 13 Air breather hole 14 Boot chamber 15 Interlocking Axle boot 16 Telescopic boot 17 Boot chamber 18 Air breather hole

Claims (4)

A seedling planting device (2) is connected to the rear of the traveling vehicle body (1), and a grip stay (77) is provided at the front end of the traveling vehicle body (1) so as to be pivotable in the front-rear direction, and above the grip stay (77). A grip bar (79) that protrudes to the left and right sides is provided. A grip shaft (82) is provided on the top of the grip stay (77) so that the front grip (75) can be rotated in the front-rear direction around the grip shaft (82). seedling planting machine, characterized in that provided. In the front side of the float (3) that slides on the soil surface while supporting the seedling planting device (2), a scraping rotor (4) that scrapes the soil surface is provided, and from the traveling vehicle body (1) to the scraping rotor (3 ) Is provided with a spline interlocking shaft (12) composed of a telescopic spline shaft (10) that is transmitted to the spline shaft and a spline cylinder shaft (11) into which the spline shaft (10) is fitted, and an air breather for the spline cylinder shaft (11). The seedling transplanter according to claim 1, further comprising an interlocking shaft boot (15) that covers the outer periphery of the hole (13) to form a first boot chamber (14) . An elastic boot (16) that covers the outer periphery of the spline shaft (10) to form a second boot chamber (17) is provided, and the interlocking shaft boot (15) and the elastic boot (16) are connected to form the first boot. The seedling transplanter according to claim 2 , wherein the chamber (14) and the second boot chamber (17) communicate with each other . A rear wheel transmission case (6) that supports the rear axle (5) of the traveling vehicle body (1) is provided, and is transmitted from the rear wheel transmission shaft case (6) to the spline shaft (10). The scraper rotor (4) is configured to be transmitted to the rotor transmission case (8), and the second air breather hole (18) formed in the upper end portion of the spline shaft (10) is connected to the first boot chamber (14) and the second boot chamber (14). The seedling transplanter according to claim 3, wherein the boot chamber (17) communicates with each other.