WO2015146911A1

WO2015146911A1 - Seedling transplanter

Info

Publication number: WO2015146911A1
Application number: PCT/JP2015/058736
Authority: WO
Inventors: 市川　祐介; 黒田　智之
Original assignee: ヤンマー株式会社
Priority date: 2014-03-24
Filing date: 2015-03-23
Publication date: 2015-10-01
Also published as: KR20160135822A; PH12016501799A1; CN106163257A

Abstract

This seedling transplanter is provided, at the front of a planting unit, with a ground leveling device for headland leveling, the power to drive the ground leveling device is transmitted from an engine via a rear axle case, the rear axle case is provided with a clutch mechanism that transmits or blocks power to the ground leveling device, the clutch mechanism comprises a first connected tool connected to a member that moves in association with the raising of the planting unit, and the clutch mechanism is disconnected by the first connected tool being operated in association with the raising of the planting unit. Because of this invention, it is possible to provide a configuration in which the clutch mechanism can be securely disconnected and connected with a simple configuration, and which can also easily be applied to existing seedling transplanters.

Description

Seedling transplanter

The present invention relates to a seedling transplanter equipped with a leveling device for headland leveling.

Patent Document 1 discloses a rice transplanter that connects and disconnects a clutch mechanism of a leveling device by a link mechanism that interlocks with a lifting operation of a lifting device that lifts and lowers a planting unit. In the rice transplanter of Patent Literature 1, a maintenance-free configuration is realized by providing a link mechanism on the upper surface side of the rear axle case serving as a transmission path of the leveling device, and performing clutch connection / disconnection using the link mechanism. .

JP 2009-183174 A

The present invention simplifies the configuration capable of disconnecting the clutch mechanism of the leveling device when the planting part is raised or the leveling device is stored, and the clutch mechanism of the leveling device is reliably disconnected when the planting part is raised. It is an object of the present invention to provide a possible seedling transplanter and to provide a configuration that can be easily applied to existing seedling transplanters.

The seedling transplanter of the present invention includes a leveling device for headland leveling in front of a planting portion, and power for driving the leveling device is transmitted from an engine via a rear axle case, and the rear axle case A clutch mechanism for transmitting or interrupting power to the leveling device, the clutch mechanism including a first wire connected to a member that moves as the planting unit ascends, and ascending the planting unit Accordingly, the first wire is operated to disconnect the clutch mechanism.

The clutch mechanism includes a second wire connected to a member that moves as the leveling device is raised and stored, and the second wire is operated as the leveling device is raised and stored. As a result, the clutch mechanism is disconnected.

The clutch mechanism includes a clutch lever that is connected to the first wire and the second wire and disconnects the clutch mechanism by the operation thereof, and the clutch lever is located above the bottom surface of the rear axle case and the rear axle. It is arranged at the front of the case overhanging to the side.

According to the present invention, it is possible to provide a configuration that reliably connects and disconnects the clutch mechanism with a simple configuration, and a configuration that can be easily applied to an existing seedling transplanter.

It is a side view of a rice transplanter. It is a skeleton figure which shows the transmission mechanism of a rice transplanter. It is sectional drawing which shows the whole structure of a leveling apparatus. It is sectional drawing which shows the internal structure of a rear axle case. It is a front perspective view which shows the clutch structure of a leveling apparatus. It is a figure which shows the clutch structure of a leveling apparatus. It is a figure which shows the clutch structure of a leveling apparatus. It is a figure which shows the handling of the wire used for the clutch structure of a leveling device. It is a figure which shows a seedling stand frame. It is a figure which shows the power taking-out mechanism and clutch mechanism which are provided in a rear axle case. It is a plane sectional view showing a power transmission part of a leveling device. It is sectional drawing of a transmission case. It is a figure which shows another embodiment of the protection structure provided in opening of a transmission case. It is an expanded sectional view showing a bearing structure in a support arm of a leveling device.

Referring to the accompanying drawings, a rice transplanter 1 as an embodiment of the seedling transplanter of the present invention will be described.

As shown in FIG. 1, the rice transplanter 1 includes an engine 2, a power transmission unit 3, a planting unit 4, and a lifting unit 5. The planting unit 4 is connected to the airframe via the lifting unit 5 and can be moved up and down by the lifting unit 5. Power from the engine 2 is transmitted to the planting unit 4 via the power transmission unit 3. The rice transplanter 1 plants seedlings in the field by the planting unit 4 while traveling by driving the engine 2.

The driving force from the engine 2 is transmitted to the PTO shaft 7 through the transmission case 6 in the power transmission unit 3. The PTO shaft 7 is provided to protrude rearward from the mission case 6. Power is transmitted from the PTO shaft 7 to the planting center case 8 via the universal joint, and the planting unit 4 is driven. A drive shaft 9 is provided rearward from the mission case 6, and a driving force is transmitted from the drive shaft 9 to the rear axle case 10.

A plurality of floats 11 are arranged in front of the planting position in the planting unit 4. In the planting part 4, a leveling device 30 is arranged in front of the float 11.

The elevating unit 5 includes a top link 12, a lower link 13, a link mechanism including a hitch 14 connected to the rear ends of the top link 12 and the lower link 13, and a cylinder that is attached to the lower link 13 and operates the link mechanism. Including. A planting center case 8 is disposed below the hitch 14, and the rolling support shaft of the planting unit 4 (the seedling stage 15) is disposed in the planting center case 8. The front ends of the top link 12 and the lower link 13 are connected to a mounting frame 17 provided at the rear end of the center frame 16. The rear axle case 10 is attached to the lower end of the attachment frame 17.

As shown in FIG. 2, power is transmitted from the engine 2 to the mission case 6. The transmission case 6 includes a hydraulic-mechanical continuously variable transmission (HMT) 21, a main transmission mechanism 22, a main clutch 23 that switches transmission of power from the HMT 21 to the main transmission mechanism 22, and an output shaft of the main transmission mechanism 22. A braking device 24 is provided for braking the rotation.

The power from the engine 2 is transmitted to the left and right

front axle cases

25 and 25 through the HMT 21 and the main transmission mechanism 22 in the transmission case 6, and the left and right

front wheels

26 and 26 are driven.

Also, power is transmitted from the output shaft of the main transmission mechanism 22 to the rear axle case 10 via the drive shaft 9. The leveling drive shaft 27 extends rearward from the rear axle case 10, and power is transmitted to the leveling transmission shaft 28 that is interlocked and connected to the leveling drive shaft 27 via a universal joint or the like. Then, power is transmitted to the leveling device 30 by the leveling transmission shaft 28 and the leveling device 30 is driven.

[Support structure of leveling device]
As shown in FIG. 3, the leveling device 30 includes a drive shaft 32 that protrudes from both sides of a transmission case 31 that receives input from the leveling transmission shaft 28, and a plurality of leveling rotors 33 that are fixed to the drive shaft 32. Prepare. The leveling device 30 is attached to the seedling stage frame 50 of the planting unit 4 via the support link mechanism 40. The support link mechanism 40 supports the leveling device 30 so that it can be moved up and down (rotated) with respect to the planting unit 4. That is, the leveling device 30 (the transmission case 31, the drive shaft 32, and the leveling rotor 33) can change the height with respect to the planting unit 4 according to the elevation of the support link mechanism 40.

The support link mechanism 40 connects the link support shaft 41 provided along the extending direction of the leveling device 30, the links 42 fixed to both ends of the link support shaft 41, the link 42 and the leveling device 30, and the leveling device 30. Supporting arm 43 and auxiliary link 44 that connects the lower end of supporting arm 43 and seedling mounting frame 50 are provided.

The link support shaft 41 is rotatably supported by the seedling stage frame 50 via the arm 45 at both ends. Thus, in the support link mechanism 40, the link 42 rotates and the support arm 43 moves up and down as the link support shaft 41 rotates, so that the seedling mounting frame 50 (planting unit) of the leveling device 30 is moved. The height with respect to 4) can be changed.

In the middle of the link support shaft 41, an operation lever 46 for rotating the link support shaft 41 is provided. By operating the operation lever 46, the link support shaft 41 can be rotated to adjust the height of the leveling device 30. A lever guide 47 for supporting the position of the operation lever 46 and determining the height of the leveling device 30 is supported by the seedling stage frame 50.

As described above, the support link mechanism 40 is attached to the seedling stage frame 50 by fixing the arm 45 and the lever guide 47 of the support link mechanism 40 to the seedling stage frame 50. In this way, the leveling device 30 is attached to the seedling stage frame 50 via the support link mechanism 40.

[Clutch structure of leveling device]
The clutch structure of the leveling device 30 will be described with reference to FIGS. 2 and 4 to 8.

As shown in FIG. 4, the rear axle case 10 is provided with a clutch mechanism 60 that switches whether power is transmitted to the leveling device 30. The clutch mechanism 60 transmits or blocks the power transmitted from the drive shaft 9 to the rear axle case 10 to the leveling drive shaft 27. The clutch mechanism 60 includes a shifter 61 slidably fitted on the leveling drive shaft 27, a clutch pawl 62 formed on the shifter 61, a clutch spring 63 that biases the shifter 61, and a shifter 61 against the clutch spring 63. The cam shaft 64 is provided. The cam shaft 64 extends outward from the rear axle case 10 and is connected to a clutch arm 65 provided outside the rear axle case 10. The other side of the clutch pawl 62 is provided in a spur gear 66 (see FIG. 2) to which power is transmitted from the drive shaft 9. In the clutch mechanism 60 configured as described above, when the clutch arm 65 is pulled, the cam shaft 64 is rotated, and the shifter 61 is slid to disconnect the clutch.

The spur gear 66 meshes with a spur gear forming portion 67 a of a gear body 67 provided on the drive shaft 9. A flat gear forming portion 67a and a bevel gear forming portion 67b are integrally formed on the gear body 67, and the bevel gear forming portion 67b meshes with a bevel gear 68 for driving the rear wheels. That is, in the rear axle case 10, an upper and lower two-layer structure is adopted in which the upper part is a transmission system for driving rear wheels and the lower part is a transmission system for driving the leveling device 30.

As shown in FIG. 5, two

wires

70 and 80 are connected to the clutch arm 65, and it is possible to operate the clutch arm 65 by operating one of the

wires

70 and 80. It is comprised so that it may become. The

wires

70 and 80 are an embodiment of a coupling tool, and any link mechanism, lever, arm, or the like can be used as long as the clutch arm 65 can be operated in conjunction with the coupling tool. The configuration can be appropriately adopted.

The first wire 70 is connected to the lower link 13 and is pulled as the lower link 13 moves upward, that is, as the planting part 4 rises. The second wire 80 is connected to the operation lever 46 and is pulled when the operation lever 46 is operated to the uppermost storage position, that is, when the leveling device 30 is raised and stored. When either one of these

wires

70 and 80 is pulled, the clutch of the leveling device 30 is disconnected via the clutch arm 65.

An outer receiver 69 for fixing the

wire outers

71 and 81 of the

wires

70 and 80 is provided on the upper front surface of the rear axle case 10.

5 and 6, the other side of the wire outer 71 of the first wire 70 is fixed to an outer receiver 72 provided on the mounting frame 17 of the center frame 16. The first wire 70 extending from the outer receiver 72 is connected to a wire mounting seat 73 provided at the front portion of the lower link 13. Thus, the first wire 70 that connects the clutch arm 65 provided on the outer surface of the rear axle case 10 and the lower link 13 is provided.

When the lower link 13 is rotated downward and the distance between the outer receiver 72 and the wire mounting seat 73 is increased, the first wire 70 is pulled, the clutch arm 65 is operated, and the clutch is disconnected. Thereby, the clutch of the leveling device 30 is disengaged following the ascending operation of the elevating unit 5. That is, when traveling the rice transplanter 1 with the planting unit 4 raised, such as when traveling on the road, it is possible to reliably stop driving the leveling device 30.

In addition, the bending angle of the universal joint connecting the leveling drive shaft 27 and the leveling transmission shaft 28 or the universal joint provided between the leveling transmission shaft 28 and the transmission case 31 increases as the planting part 4 rises. Suppressing the rotational drive in such a state can improve the life of the universal joint and improve the durability of the transmission mechanism.

The mounting positions of the outer receiver 72 and the wire mounting seat 73 are not limited to those described above, and any position where the distance between the outer receiver 72 and the wire mounting seat 73 increases as the lower link 13 rises can be employed.

7, the other side of the wire outer 81 of the second wire 80 is fixed to an outer receiver 82 provided on the lower surface of the lever guide 47 fixed to the seedling stage frame 50. The second wire 80 extending from the outer receiver 82 is fixed to the rotating base of the operation lever 46 and connected to a wire mounting seat 83 that moves up and down with the rotation. In this way, the second wire 80 that connects the clutch operating clutch arm 65 provided on the outer surface of the rear axle case 10 and the operation lever 46 is provided.

When the operation lever 46 is rotated upward and operated to the uppermost storage position, the distance between the outer receiver 82 and the wire mounting seat 83 becomes larger than a predetermined value, and the second wire 80 is pulled and the clutch arm is pulled. 65 operates and the clutch of the leveling device 30 is disengaged. Accordingly, the clutch is disconnected following the storing operation of the leveling device 30. That is, the driving of the leveling device 30 can be surely stopped when the leveling device 30 is not used, for example, when traveling on the road.

The mounting positions of the outer receiver 82 and the wire mounting seat 83 are not limited to those described above, and any position where the distance between the outer receiver 82 and the wire mounting seat 83 increases with the upward rotation of the operation lever 46 can be adopted. .

Further, assuming that the

wires

70 and 80 are pulled when the clutch of the leveling device 30 is disconnected, the optimum mounting positions of the

outer receivers

72 and 82 and the

wire mounting seats

73 and 83 are determined. However, when the clutch of the leveling device 30 is disconnected, the

wires

70 and 80 may be loosened. In such a case, the

outer receivers

72 and 82 and the

wire mounting seats

73 and 83 may be installed so as to move in the opposite direction to the raising operation of the elevating unit 5 and the raising operation of the operation lever 46.

As shown in FIGS. 5 and 6, the clutch lever 65 is disposed on the front side surface of the rear axle case 10, and is located above the bottom surface of the rear axle case 10 and toward the side of the rear axle case 10. Located at the front of the overhang. That is, the clutch lever 65 is disposed in a shadowed portion of the rear axle case 10 and is disposed in a place where it is difficult to cover mud and water and is difficult to malfunction due to mud pushing from below the fuselage.

[Wire management]
As shown in FIG. 8, the first wire 70 is passed through a wire outer 71 disposed between the

outer receivers

69 and 72, and the wire outer 71 together with the wire outer 81 of the second wire 80 is a rear axle case. 10 is drawn upward from the side of the wire through the wire outer receiver 69, is extended downward from the upper end of the mounting frame 17 along the mounting frame 17, and is connected to the outer receiver 72.

Further, the second wire 80 is passed through a wire outer 81 disposed between the

outer receivers

69 and 82, and the wire outer 81 together with the wire outer 71 of the first wire 70 from the side of the rear axle case 10. It is drawn upward via the wire outer receiver 69, extended rearward along the top link 12 from the upper end of the mounting frame 17, and toward the rear end portion of the lower link 13 from the front and rear midway portion of the top link 12. It extends obliquely downward, is lifted upward from the planting center case 8 side toward the lever guide 47, and is connected to the outer receiver 82. A holding tool 84 for holding the wire outer 81 while restricting the movement range is attached to the middle part of the top link 12 before and after, and for holding the wire outer 81 while restricting the movement range of the lower link 13. The holder 85 is attached. The top link 12 and the lower link 13 move up and down in accordance with the raising and lowering of the planting portion 4. In this way, the wire outer 81 is guided by the two

holders

84 and 85 and reaches the lever guide 47 from the rear axle case 10. The wire route is secured.

[Installation of leveling device]
When attaching the leveling device 30 to the rice transplanter 1, first, the support link mechanism 40 is attached to the seedling stand frame 50 in a state where the leveling device 30 is supported by the support link mechanism 40. Then, the rear axle case 10 is provided with a leveling drive shaft 27 and a clutch mechanism 60 that serve as a power transmission path to the leveling device 30, and connects the leveling drive shaft 27 and the leveling transmission shaft 28. Further, in order to operate the clutch mechanism 60,

wires

70 and 80 are connected to the clutch arm 65. Finally, the leveling device 30 can be attached to the rice transplanter 1 by connecting the

wires

70 and 80 to the lower link 13 and the operation lever 46, respectively.

[Seedling stand frame]
As shown in FIG. 9, the seedling stand frame 50 includes a planting frame 51 having a square pipe structure, a side frame 52 provided upward from both side ends of the planting frame 51, and upper and lower sides of the side frame 52. A rolling arm 53 passed to the middle part and a pin holder 54 passed to the upper end of the side frame 52 are provided.

The planting frame 51 is provided with a number of planting cases according to the number of planting strips of the rice transplanter 1 facing backward. A planting center case 8 is disposed in the center of the planting frame 51, and power is branched and transmitted from the planting center case 8 to each planting case provided on both sides via a planting horizontal axis. In this configuration, the transmission shaft 51 is not provided in the planting frame 51, so that the function as a frame can be exhibited and sufficient rigidity can be ensured.

In the center of the rolling arm 53, a stay 57 to which a hitch base 56 that supports the lower portion of the hitch 14 is attached is provided. The lower end of the stay 57 and the planting frame 51 are connected by a hitch stand 56. That is, the rolling arm 53 is connected to the planting frame 51 by the stay 57 and the hitch base 56. Further, the hitch stand 56 is supported by the planting frame 51, and the planting center case 8 is also attached to the hitch stand 56.

Brackets 58 to which the arm 45 of the support link mechanism 40 is fixed are provided on both sides of the rolling arm 53. A bracket 59 for fixing the lever guide 47 is provided on the rolling arm 53. The arm 45 is fixed to the bracket 58 and the lever guide 47 is fixed to the bracket 59, whereby the support link mechanism 40 and the leveling device 30 are supported by the seedling stage frame 50.

[Rear axle case]
As shown in FIGS. 4 and 10, in the rear axle case 10, as a mechanism for extracting the power to the leveling device 30, the leveling drive shaft 27 connected to the leveling transmission shaft 28 and the power to the leveling device 30. A clutch mechanism 60 that connects and disconnects the shaft, a bearing that supports the leveling drive shaft 27, an oil seal that seals the rear axle case 10, a retaining ring, and the like are disposed.

Thus, in this configuration, the power from the rear axle case 10 to the leveling device 30 is taken out and branched, and the rear axle case 10 is provided with the clutch mechanism 60 that switches the presence or absence of power transmission to the leveling device 30. . Note that the present invention is not limited to the present configuration in which the power from the rear axle case 10 to which the power from the drive shaft 9 is transmitted to the leveling device 30 is branched, and may be branched from the PTO shaft 7, for example.

[Unitization of leveling device]
The mechanism including the leveling device 30 and the support link mechanism 40 configured as described above can be attached to a rice transplanter that does not include the leveling device.

A member necessary for taking out the power is a power take-off mechanism including the leveling drive shaft 27 and the clutch mechanism 60 provided in the rear axle case 10, and a member necessary for attaching is the outer receiver 69 of the rear axle case 10. The mounting structure includes an outer receiver 72 of the mounting frame 17, a wire mounting seat 73 of the lower link 13, a bracket 58 of the arm 45, and a bracket 59 of the lever guide 47.

The mechanism by the leveling device 30 and the support link mechanism 40 can be easily introduced by providing these members at predetermined locations of the rice transplanter in advance or by providing them at predetermined locations at the time of attachment. When providing in advance, the rear axle case 10 has a space for providing a power take-out mechanism, the outer receiver 69 is fixed to the rear axle case 10 by welding or the like, and the outer receiver 72 is fixed to the mounting frame 17 by welding or the like. The wire attachment seat 73 is fixed to the lower link 13 by welding or the like, and the

brackets

58 and 59 are fixed to the rolling arm 53 by welding or the like.

Further, when installing at a predetermined location at the time of attachment, a power take-out mechanism and a clutch mechanism 60 are installed in the rear axle case 10, an outer receiver 69 is fixed to the rear axle case 10 by welding or the like, and an outer receiver 72 is mounted on the mounting frame 17. Are fixed to the lower link 13 by welding or the like, and the

brackets

58 and 59 are fixed to the rolling arm 53 by welding or the like. In this way, by installing the mounting structure as a retrofit, it is easy to assemble in a state where the quality of the leveling device 30 is ensured without fine adjustment even in situations where assembly maintenance facilities such as a factory such as a terminal sales site are not in place. be able to.

As described above, a mechanism including the leveling device 30 and the support link mechanism 40 is assembled in advance and can be attached as an integral unit, so that it can be easily applied to an existing seedling transplanter that does not include the leveling device. Can be introduced. At that time, by assembling the leveling device 30 and the support link mechanism 40 as a kit that has been adjusted in advance and assembled, the assembly accuracy of the leveling device 30 and the support link mechanism 40 can be guaranteed. It is possible to sufficiently exhibit the leveling performance of 30. Moreover, the workability | operativity at the time of assembling the rice transplanter 1 can also be improved.

Further, when shipping a seedling transplanter not equipped with a leveling device, a space for a power take-out mechanism and a clutch mechanism of the leveling device 30 is provided in the inner space of the rear axle case 10, and the side surface of the rear axle case 10 is provided. By installing an outer receiver 69 for attaching a wire for operating the clutch mechanism in advance, the power take-out mechanism and the clutch mechanism can be easily attached later.

And by providing an attachment structure for attaching the mechanism including the leveling device 30 and the support link mechanism 40 in advance, the work for attaching the leveling device 30 later becomes easy.

[Transmission case]
As shown in FIGS. 3 and 11, in the leveling device 30, a part of the power from the drive shaft 9 is branched to the leveling transmission shaft 28 via the rear axle case 10, and the leveling transmission shaft 28 is connected to the leveling transmission shaft 28 via a universal joint or the like. Are transmitted to the drive shaft 32 extending from the both side surfaces of the transmission case 31 to the side via the input shaft 34 interlocked and the transmission case 31 receiving the input of the input shaft 34. A plurality of leveling rotors 33 are fixed to the drive shaft 32. The drive shaft 32 is formed in a quadrangular shape in cross section, and the leveling rotor 33 is fixed to the drive shaft 32 so as not to rotate relative to the drive shaft 32 by engaging with a rectangular opening at the center of the leveling rotor 33.

As shown in FIG. 11, the drive shaft 32 includes a rotor input shaft 35 that protrudes laterally from both side surfaces of the transmission case 31, a rotor drive shaft 36 that is connected to the rotor input shaft 35 and extends on both sides, It is constituted by a joint 37 that connects the rotor input shaft 35 and the rotor drive shaft 36. Connection between the rotor input shaft 35 and the joint 37 of the rotor drive shaft 36 is realized by spline fitting. As described above, the spline coupling of the rotor input shaft 35 and the rotor drive shaft 36 via the joint 37 can improve the transmission efficiency in transmitting power from the rotor input shaft 35 to the rotor drive shaft 36. . Furthermore, since the contact area can be increased by the spline groove, wear between the rotor input shaft 35 and the rotor drive shaft 36 and the joint 37 can be prevented.

As shown in FIG. 11, in the transmission case 31, a bevel gear 38 is provided at the end of the input shaft 34 that is interlocked with the leveling transmission shaft 28, and the bevel gear 39 that meshes with the bevel gear 38 is provided in the middle of the rotor input shaft 35. Fixed to the part. Power is transmitted to the rotor input shaft 35 via these

bevel gears

38 and 39. As the rotor input shaft 35 rotates, the rotor drive shaft 36 is driven via the joint 37, and the leveling rotor 33 rotates.

As shown in FIGS. 11 and 12, the transmission case 31 includes a main body 90 and a lid 92. The main body 90 has an opening through which the input shaft 34 penetrates, and rotatably supports the input shaft 34 on the inner periphery of the opening, and the openings 91 through which the drive shaft 32 (rotor input shaft 35) penetrates both sides. Have. The lid 92 rotatably supports the drive shaft 32 (rotor input shaft 35) and closes the opening 91 of the main body 90.

The main body 90 is formed as an integral box-shaped member having an opening through which the input shaft 34 penetrates and an opening 91 through which the drive shaft 32 penetrates, and a housing portion 90a for housing the bevel gears 38 and 39 therein, and an input It is formed as a cylindrical member having an opening through which the shaft 34 passes, and includes a cylindrical portion 90b extending forward (rear axle case 10 side) from the accommodating portion 90a. The main body 90 is integrally formed so as to include the accommodating portion 90a and the cylindrical portion 90b.

The oil seal 100 that seals the inside of the transmission case 31 and the

bearings

101 and 101 that rotatably support the input shaft 34 are sequentially arranged on the inner peripheral surface of the cylindrical portion 90b from the opening side.

The lid 92 seals the internal space of the main body 90 by closing the openings 91 provided on both side surfaces of the main body 90. An O-ring 92 is provided between the outer surface of the lid 92 and the inner surface of the main body 90. A through portion through which the rotor input shaft 35 penetrates is provided at the center of the lid 92, and a boss portion 93 projecting sideways from both side surfaces of the lid 92 is integrally provided along the through portion. . An oil seal 103 for sealing the inside of the transmission case 31 and a bearing 104 for rotatably supporting the rotor input shaft 35 are disposed in order from the opening side on the inner peripheral surface of the boss portion 93, and the oil seal 103 is A retaining ring 105 for fixing is provided.

By configuring the transmission case 31 with the main body 90 and the lid 92 that closes the opening 91 of the main body 90, the rigidity of the integrally molded main body 90 can be increased. By forming the main body 90 in a seamless integrated structure in this way, torque when a torque fluctuation occurs in the input shaft 34 supported by the main body 90 via the bearing 101 is not applied to the main body 90. Deformation of the main body 90 can be prevented. That is, it is possible to reduce as much as possible the influence on the main body 90 due to the backlash caused by the input shaft 34 accompanied by torque fluctuation or the backlash caused by the unbalance of the shaft provided in the transmission path. Therefore, it is possible to prevent the sealing performance of the transmission case 31 from being impaired due to the deformation of the main body 90.

Further, by integrally molding the main body 90, it is not necessary to assemble the main body 90 when assembling the transmission case 31, and the assembly position within the main body 90 is determined at the time of molding. The positioning accuracy of each component when assembling the transmission case 31 by assembling the components can be increased.

Furthermore, the lid 92 has a seamless and highly rigid structure, and holds a bearing 104 for supporting the drive shaft 32 (rotor input shaft 35), and a boss portion 93 that protrudes to the side of the main body 90. By being provided integrally with the lid 92, even when torque fluctuation occurs in the rotor input shaft 35, absorption is performed by the entire transmission case 31 including the lid 92 having high rigidity and the main body 90 to which the lid 92 is fixed. Can do. Thereby, the influence which the play by the rotor input shaft 35 has on the lid 92 can be minimized. Accordingly, the sealing property of the lid 92 can be ensured, and the bearing 104 can be prevented from being damaged.

As shown in FIG. 11, the end portion of the joint 37 on the transmission case 31 side covers the outer end portion of the boss portion 93 and extends from the outer end portion of the boss portion 93 toward the inner side of the transmission case 31. It is provided to do. In other words, the inner end portion of the joint 37 is provided with an enlarged diameter portion 37 a that is larger than the outer diameter of the rotor input shaft 35, and the outer peripheral portion of the enlarged diameter portion 37 a is the protruding end portion of the boss portion 93. Has been extended to overlap.

Thus, the path to the oil seal 103 is formed in a labyrinth shape by placing the open portion of the enlarged diameter portion 37a of the joint 37 on the boss portion 93 of the transmission case 31.

Dust and other foreign matter wound up by the rotation of the leveling rotor 33 and entering between the transmission case 31 and the leveling rotor 33 accumulate in the vicinity of the leveling rotor 33 and then proceed from the leveling rotor 33 side toward the transmission case 31 side. .

Therefore, the path entering the inside from the open part of the inner end of the joint 37 and heading toward the opening of the boss part 93 is opposite to the traveling direction of the foreign substance (the direction from the outside of the transmission case 31 to the inside). And the penetration | invasion direction which goes to the oil seal 103 from the outer side edge part of the boss | hub part 93 turns into the reverse direction further. As described above, by providing the joint 37, the path reaching the oil seal 103 of the transmission case 31 has a labyrinth structure that is opposite to the traveling direction of the foreign matter.

As described above, a part of the joint 37 that connects the rotor input shaft 35 and the rotor drive shaft 36 is the enlarged diameter portion 37a, and the enlarged diameter portion 37a is provided so as to cover the boss portion 93 of the transmission case 31. It is possible to effectively prevent foreign matter from entering the oil seal 103 of the transmission case 31.

Furthermore, since the path of the contaminants is physically blocked by the enlarged diameter portion 37a of the joint 37, the amount of contaminants reaching the inner end of the joint 37 can be reduced. At the same time, the foreign matter advances along the outer periphery of the joint 37 arranged as a rotating body, and when the foreign matter exceeds the diameter-expanded portion 37a, the centrifugal force of rotation acts in the direction in which the foreign matter separates from the joint 37. By doing so, it is also possible to expect the effect of shaking off the impurities from the joint 37.

Further, the transmission case 31 is fixed to the drive shaft 32 so as not to rotate. That is, the drive shaft 32 rotates relative to the boss portion 93 of the transmission case 31 that is fixed so as not to rotate. Thereby, the sliding part 106 is formed between the inner peripheral surface of the joint 37 and the outer peripheral surface of the boss part 93.

Even when foreign matter enters the gap between the joint 37 and the boss portion 93, the foreign matter can be crushed by the sliding portion 106. Therefore, even if foreign matter enters the inside of the joint 37, it can be prevented from being crushed by the scraper effect of the sliding portion 106 and reaching the oil seal 103, and entangled with the drive shaft 32.

As shown in FIG. 12, an oil hole 107 is formed on the upper surface of the main body 90 of the transmission case 31, and a nipple 108 for closing the oil hole 107 is attached. The transmission case 31 is filled with lubricating oil. Thereby, by confirming that the lubricating oil has leaked from the transmission case 31, it is possible to confirm damage to the lips of the oil seals 100 and 103 of the transmission case 31. By detecting and treating the breakage of the oil seals 100 and 103 at an early stage, it is possible to prevent damage to the

bearings

101 and 104, the bevel gears 38 and 39, and the like disposed on the inside thereof.

Also, a drain (not shown) for taking out the internal lubricating oil is provided at the lower rear portion of the main body 90, and the internal lubricating oil can be easily discharged and replaced. The transmission case 31 may be filled with grease instead of the lubricating oil.

As shown in FIG. 12, the protective member 120 is fixed to the outer periphery of the cylindrical portion 90b of the main body 90. The protection member 120 protects the periphery of the connecting portion between the input shaft 34 and the leveling transmission shaft 28, and covers the leveling transmission shaft 28 connected to the input shaft 34 and a universal joint provided therebetween. Protect.

The protective member 120 is a bellows-shaped protective boot, and is fixed by using a clip 121 around a cylindrical portion 90 b extending toward the front of the main body 90. Since the cylindrical portion 90b extends forward from the front surface of the housing portion 90a formed in a box shape, the length of the cylindrical portion 90b can be used as it is as the fixing portion of the clip 121, and is protected. The fixed length of the member 120 can be increased. Thereby, the protective member 120 can be attached more firmly, and it can prevent that it falls out and a clearance gap is vacant. Therefore, mud and impurities do not enter the transmission case 31 from the protective member 120 side, and the occurrence of problems due to such intruders can be prevented.

FIG. 13 shows another embodiment of the protective structure provided in the opening of the transmission case 31 (boss portion 93).

As shown in FIG. 13, the joint 37 is not provided with the enlarged diameter portion 37 a, but is provided with an extension portion 130 that extends the open end portion of the boss portion 93 radially outward, and the outer periphery of the rotor input shaft 35. A plate 131 is provided on the plate. The plate member 131 is a disk-shaped member that is fixed to the outer periphery of the rotor input shaft 35, and is disposed so as to face the extended portion 130 of the boss portion 93. In this way, the foreign material traveling from the leveling rotor 33 side is blocked by the plate material 131, and the opening of the boss portion 93 is provided by providing a path intruding between the plate material 131 and the extending portion 130 in the radial direction. It is possible to reduce the amount of contaminants reaching up to. Furthermore, the plate member 131 rotates relative to the extending portion 130 of the boss portion 93 by rotating with the rotation of the rotor input shaft 35. In other words, the foreign matter that has entered between the plate member 131 and the extended portion 130 of the boss portion 93 can be ground.

As shown in FIG. 14, a side case 110 formed in a cylindrical shape is provided on the support portion of the drive shaft 32 in the support arm 43.

The side case 110 houses a bearing 111 that rotatably supports the drive shaft 32 and an oil seal 112 that is disposed on both sides of the bearing 111. In the side case 110, a collar 113 having an opening corresponding to the cross-sectional shape of the drive shaft 32 and having a circular outer peripheral surface is fixed to the drive shaft 32, and a bearing 111 and an oil seal are provided on the outer peripheral surface of the collar 113. 112 is fixed.

Protective members 114 formed in a plate-like disk shape are provided at both side ends of the collar 113. The protection member 114 is provided in contact with the outer end of the collar 113. The protection member 114 is fixed to the drive shaft 32 and is configured to be rotatable with the rotation of the drive shaft 32.

両側 Both side ends of the side case 110 extend outward from both side ends of the collar 113. The protection member 114 extends from the outer end of the collar 113 to the outside of the outer end of the side case 110, extends radially outward from the side case 110, and further extends toward the inside of the side case 110. Is issued. In other words, the protection member 114 is provided so as to be recessed toward the inner side of the side case 110 along the axial direction of the drive shaft 32, and extends from the recessed central portion 114a toward the outer side in the axial direction. And an outer peripheral portion 114b formed by being bent into a crank shape so as to cover the outer end of the side case 110.

Thus, by providing the protection members 114 at the openings at both ends of the side case 110, the path to the oil seal 112 is formed in a labyrinth shape.

Dust and other foreign matter wound up by the rotation of the leveling rotor 33 and entering between the side case 110 and the leveling rotor 33 accumulate in the vicinity of the leveling rotor 33, and then proceed from the leveling rotor 33 side toward the side case 110 side. .

Therefore, the path from the opening at the inner end of the protective member 114 to the inside and toward the opening of the side case 110 is opposite to the traveling direction of the foreign matter (the direction from the outside of the side case 110 to the inside). . And the penetration | invasion direction which goes to the oil seal 112 from the outer side edge part of the side case 110 turns into the reverse direction further. Thus, by providing the protective member 114, the labyrinth structure is configured such that the path reaching the oil seal 112 of the side case 110 is opposite to the traveling direction of the foreign matter.

Further, the foreign matter needs to go from the leveling rotor 33 along the drive shaft 32 toward the central portion 114b of the protection member 114, and when the foreign matter reaches the outer peripheral portion 114b from the central portion 114a, the dent of the central portion 114a must be exceeded There is. In other words, the protection member 114 having a concave shape at the center can provide resistance to the progress of the foreign matter.

As described above, by providing the protection members 114 so as to cover the openings at both ends of the side case 110 from the outside, it is possible to effectively prevent foreign substances from entering the oil seal 112 of the side case 110.
And the protection member 114 can be rotated with respect to the side case 110 by fixing to the drive shaft 32 (rotor drive shaft 36). Thereby, the foreign substance which entered between the inner peripheral surface of the protective member 114 and the outer peripheral surface of the side case 110 from the open part of the protective member 114 can be finely crushed.

A grease hole 116 and a grease nipple 117 that closes the grease hole 116 are provided on the upper surface of the side case 110. The internal space surrounded by the oil seal 112 in the side case 110 is filled with grease. By filling the grease in this way, even when the lip of the oil seal 112 is damaged, the effect of preventing the intrusion into the inside by the grease can be expected.

A donut-shaped retaining ring 115 is provided outside the oil seal 112. The retaining ring 115 is fixed to the inner peripheral surface of the side case 110 and positions the oil seal 112. The retaining ring 115 can provide an additional labyrinth structure in the side case 110.

The present invention can be used for a seedling transplanter equipped with a leveling device for headland leveling.

1: rice transplanter, 2: engine, 10: rear axle case, 30: leveling device, 40: support link mechanism, 50: seedling stand frame, 60: clutch mechanism, 69: outer support, 70: first wire (first wire) 1 connector), 71: wire outer, 72: outer receiver, 73: wire mounting seat, 80: second wire (second connecting device), 81: wire outer, 82: outer receiver, 83: wire mounting seat

Claims

It is equipped with a leveling device for headland leveling in front of the planting part,
The power for driving the leveling device is transmitted from the engine through a rear axle case, and the rear axle case is provided with a clutch mechanism for transmitting or blocking power to the leveling device,
The clutch mechanism includes a first connector that is connected to a member that moves as the planting part moves up, and the first connector is operated as the planting part moves up, A seedling transplanting machine characterized by cutting the clutch mechanism.
The clutch mechanism includes a second connector that is connected to a member that moves in accordance with an operation of raising and storing the leveling device, and the second connector is configured to operate when the leveling device is raised and stored. The seedling transplanting machine according to claim 1, wherein the clutch mechanism is disconnected by being operated.
The clutch mechanism includes a clutch lever that is connected to the first connector and the second connector and disconnects the clutch mechanism by an operation thereof, the clutch lever being above the bottom surface of the rear axle case, and The seedling transplanting machine according to claim 2, wherein the seedling transplanting machine is arranged at a front portion of the rear axle case projecting laterally.