JP2015173639A - seedling transplanting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that a gap which foreign substances enter exists in the part where a rotating pivot protrudes from a transmission case, and thereby a sealing material of the transmission case may be damaged due to the foreign substances wound around a rotating pivot.SOLUTION: A leveling device includes: a transmission case to which power from an engine is transmitted; a drive shaft protrudingly provided from a boss section projected from both side surfaces of the transmission case toward the side through an oil seal to the side; and a plurality of leveling rotors fixed to the drive shaft. The drive shaft comprises: a rotor input shaft laterally protruding from the boss section of the transmission case; and a rotor drive shaft connected through the rotor input shaft and a joint. The end part on the transmission case side of the joint is increased in diameter to provide an enlarged diameter part for covering the outside end part of the boss section of the transmission case.

Description

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

  In the ground leveling device of Patent Document 1, power is transmitted from a rear axle case to a leveling transmission shaft that is interlocked and connected via a universal joint and a connecting shaft, and further, power is transmitted from the leveling transmission shaft to the transmission case and protrudes from the transmission case. A rotating body group that is driven to rotate by the rotating support shaft. Then, a bowl-shaped cover body is housed and mounted in the concave space portion of the rotating body located at the end of the rotating body group to reduce the adhesion of impurities to the rotating body and to function as a scraper.

Japanese Patent No. 4960123

  According to the technique described in Patent Document 1, entanglement of impurities such as wrinkles on the rotating body can be reduced by the hook-shaped cover body. However, since there is a gap through which impurities enter the portion where the rotation support shaft protrudes from the transmission case, there is a possibility that the sealing material of the transmission case may be damaged by the impurities wound around the rotation support shaft.

  The seedling transplanting machine of the present invention includes a leveling device that is driven by receiving power transmitted from an engine, and the leveling device includes a transmission case to which power from the engine is transmitted, and laterally from both side surfaces of the transmission case. A drive shaft that protrudes from the boss portion that protrudes toward the side through an oil seal, and a plurality of leveling rotors that are fixed to the drive shaft, the drive shaft including the transmission case A rotor input shaft that protrudes laterally from the boss portion of the rotor, and a rotor drive shaft connected to the rotor input shaft via a joint, the transmission case side end of the joint being expanded in diameter, and the transmission case An enlarged diameter portion that covers the outer end portion of the boss portion is provided.

  Lubricating oil is filled in the transmission case.

  A sliding portion for pulverizing impurities is formed between the enlarged diameter portion of the joint and the boss portion of the transmission case.

  According to the present invention, the periphery of the boss portion serving as a power takeout portion from the transmission case to the drive shaft is covered with the enlarged diameter portion of the joint, and from the joint opening portion to the oil seal provided on the boss portion of the transmission case. The process can be a labyrinth structure, and the arrival of foreign substances to the oil seal can be suppressed.

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 a figure which shows a leveling apparatus. It is an expanded sectional view which shows the transmission part of a leveling apparatus. It is an expanded sectional view which shows the effect show | played by the enlarged diameter part of a joint. It is a figure which shows another embodiment of the labyrinth structure of a transmission case and a joint. It is an expanded sectional view showing a bearing structure in a support arm of a leveling device. It is an expanded sectional view which shows the effect show | played by the protection member of a side case.

A rice transplanter 1 that is an embodiment of a seedling transplanter of the present invention will be described with reference to the accompanying drawings.
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 via 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 transmission case 8 through 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 20 is arranged in front of the float 11.

  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) 12, a main transmission mechanism 13, a main clutch 14 that switches transmission of power from the HMT 12 to the main transmission mechanism 13, and an output shaft of the main transmission mechanism 13. A braking device 15 is provided for braking the rotation.

The power from the engine 2 is transmitted to the left and right front axle cases 16 and 16 through the HMT 12 and the main transmission mechanism 13 in the transmission case 6, and the left and right front wheels 17 and 17 are driven.
Further, power is transmitted from the output shaft of the main transmission mechanism 13 to the rear axle case 10 via the drive shaft 9. The leveling drive shaft 18 extends rearward from the rear axle case 10, and power is transmitted to the leveling transmission shaft 19 that is linked to the leveling drive shaft 18 through a universal joint or the like. Then, the leveling device 20 is driven by the leveling shaft 19.

  As shown in FIG. 3, the leveling device 20 is attached to the planting frame 4 a that supports the planting unit 4 via the support link mechanism 30. The support link mechanism 30 supports the leveling device 20 so as to be movable up and down (turned) with respect to the planting unit 4. That is, the leveling device 20 can change the height with respect to the planting part 4 according to the raising and lowering of the support link mechanism 30.

The support link mechanism 30 includes a link support shaft 31 provided along the extending direction of the leveling device 20 (the width direction of the planting frame 4a), links 32 fixed to both ends of the link support shaft 31, the link 32, and the leveling device. 20, a support arm 33 that supports the leveling device 20, and an auxiliary link 34 that connects the lower end of the support arm 33 and the planting frame 4 a.
The link support shaft 31 is rotatably supported by the planting frame 4a via the arms 35 at both ends. Thus, in the support link mechanism 30, the link 32 rotates and the support arm 33 moves up and down with the rotation of the link support shaft 31, so that the planting frame 4 a (planting unit 4) of the leveling device 20. ) Can be changed.

As shown in FIGS. 3 and 4, in the leveling device 20, a part of the power from the drive shaft 9 is branched to the leveling transmission shaft 19 via the rear axle case 10, and the input is linked to the leveling transmission shaft 19. It is transmitted to the drive shaft 23 that extends toward both sides of the transmission case 22 via the shaft 21 and the transmission case 22 that receives the input of the input shaft 21. A plurality of leveling rotors 24 are fixed to the drive shaft 23. The drive shaft 23 is formed in a quadrangular shape in cross section, and the leveling rotor 24 is fixed to the drive shaft 23 so as not to rotate relative to the drive shaft 23 by engaging with a rectangular opening at the center of the leveling rotor 24.
The drive shaft 23 is a rotor input shaft 25 that protrudes laterally from both side surfaces of the transmission case 22, a rotor drive shaft 26 that is connected to the rotor input shaft 25 and extends to both sides, and the rotor input shaft 25 and the rotor drive. It is constituted by a joint 27 that connects the shaft 26. The connection between the rotor input shaft 25 and the rotor drive shaft 26 with the joint 27 is realized by spline fitting.

  As shown in FIG. 4, in the transmission case 22, a bevel gear 28 is provided at the end of the input shaft 21 that is interlocked with the leveling transmission shaft 19, and the bevel gear 29 that meshes with the bevel gear 28 is provided in the middle of the rotor input shaft 25. Fixed to the part. Power is transmitted to the rotor input shaft 25 through these bevel gears 28 and 29. As the rotor input shaft 25 rotates, the rotor drive shaft 26 is driven via the joint 27, and the leveling rotor 24 rotates.

  As shown in FIG. 4, the transmission case 22 includes a main body 40 and a lid 42. The main body 40 has an opening through which the input shaft 21 passes, and rotatably supports the input shaft 21 at the inner periphery of the opening, and the opening 41 through which the drive shaft 23 (rotor input shaft 25) passes is formed on both side surfaces. Have. The lid 42 rotatably supports the drive shaft 23 (rotor input shaft 25) and closes the opening 41 of the main body 40.

The main body 40 is formed as an integral box-shaped member having an opening through which the input shaft 21 penetrates and an opening 41 through which the drive shaft 23 penetrates, and a housing portion 40a for housing the bevel gears 28 and 29 therein, and an input It is formed as a cylindrical member having an opening through which the shaft 21 penetrates, and includes a cylindrical portion 40b extending forward (rear axle case 10 side) from the accommodating portion 40a. The main body 40 is integrally molded so as to include the accommodating portion 40a and the cylindrical portion 40b.
An oil seal 50 that seals the inside of the transmission case 22 and bearings 51 and 51 that rotatably support the input shaft 21 are disposed in order from the opening side on the inner peripheral surface of the cylindrical portion 40b.

  The lid 42 seals the internal space of the main body 40 by closing the openings 41 provided on both side surfaces of the main body 40. An O-ring 52 is provided between the outer surface of the lid 42 and the inner surface of the main body 40. A through portion through which the rotor input shaft 25 penetrates is provided at the center of the lid 42, and a boss portion 43 that protrudes laterally from both side surfaces of the lid 42 is integrally provided along the through portion. . An oil seal 53 for sealing the inside of the transmission case 22 and a bearing 54 for rotatably supporting the rotor input shaft 25 are disposed on the inner peripheral surface of the boss portion 43 in order from the opening side. A retaining ring 55 for fixing is provided.

As shown in FIG. 4, the end portion of the joint 27 on the transmission case 22 side covers the outer end portion of the boss portion 43 and extends from the outer end portion of the boss portion 43 toward the inner side of the transmission case 22. It is provided to do. In other words, the inner end portion of the joint 27 is provided with an enlarged diameter portion 27 a that is larger than the outer diameter of the rotor input shaft 25, and the outer peripheral portion of the enlarged diameter portion 27 a is the protruding end portion of the boss portion 43. Has been extended to overlap.
Thus, the path to the oil seal 53 is formed in a labyrinth shape by placing the open portion of the enlarged diameter portion 27 a of the joint 27 on the boss portion 43 of the transmission case 22.

The transmission case 22 is filled with lubricating oil. Accordingly, by confirming that the lubricating oil has leaked from the transmission case 22, it is possible to confirm damage to the lips of the oil seals 50 and 52 of the transmission case 22. By detecting and treating the breakage of the oil seals 50 and 53 at an early stage, it is possible to prevent damage to the bearings 51 and 54, the bevel gears 28 and 29, and the like disposed on the inside thereof.
For example, by providing an oil filler opening in the transmission case 22, the case can be filled with lubricating oil after the transmission case 22 is assembled.

As shown in FIG. 5, dust and other foreign matter wound up by the rotation of the leveling rotor 24 and entering between the transmission case 22 and the leveling rotor 24 accumulate near the leveling rotor 24, and then transmit from the leveling rotor 24 side. Proceed toward the case 22 side.
Therefore, the path entering the inside from the open portion of the inner end portion of the joint 27 toward the opening of the boss portion 43 is opposite to the traveling direction of the foreign matter (the direction from the outside of the transmission case 22 to the inside). And the penetration | invasion direction which goes to the oil seal 53 from the outer side edge part of the boss | hub part 43 becomes the reverse direction further. In this way, by providing the joint 27, the path reaching the oil seal 53 of the transmission case 22 has a labyrinth structure that is opposite to the traveling direction of the foreign matter.

As described above, a part of the joint 27 that connects the rotor input shaft 25 and the rotor drive shaft 26 is the enlarged diameter portion 27a, and the enlarged diameter portion 27a is provided so as to cover the boss portion 43 of the transmission case 22. It is possible to effectively prevent foreign matter from entering the oil seal 53 of the transmission case 22.
Furthermore, since the path of the foreign matter is physically blocked by the enlarged diameter portion 27a of the joint 27, the amount of the foreign matter reaching the inner end of the joint 27 can be reduced. At the same time, the foreign matter advances along the outer periphery of the joint 27 arranged as a rotating body, and when the foreign matter exceeds the diameter-expanded portion 27a, the centrifugal force of rotation acts in a direction in which the foreign matter moves away from the joint 27. By doing so, it is also possible to expect the effect of shaking off foreign substances from the joint 27.

As shown in FIG. 5, the transmission case 22 is fixed to the drive shaft 23 so as not to rotate. That is, the drive shaft 23 rotates relative to the boss portion 43 of the transmission case 22 that is fixed so as not to rotate. Thereby, the sliding part 56 is formed between the inner peripheral surface of the joint 27 and the outer peripheral surface of the boss part 43.
Even when impurities enter the gap between the joint 27 and the boss portion 43, the impurities can be crushed by the sliding portion 56. Therefore, even if foreign matter enters the inside of the joint 27, it can be prevented from being crushed by the scraper effect of the sliding portion 56 and reaching the oil seal 53, and entangled with the drive shaft 23.

FIG. 6 shows another embodiment of the labyrinth structure of the transmission case 22 and the joint 27.
As shown in FIG. 6, by providing a protrusion 57 that further increases the diameter at the inner end of the diameter-expanded portion 27 a of the joint 27, it functions as a physical obstacle to prevent impurities from reaching the open portion of the joint 27. Can be made. Further, by providing the groove 58 on the outer peripheral surface of the boss portion 43 in the sliding portion 56, fine impurities after being crushed by the sliding portion 56 can be temporarily stored.
As described above, by making the labyrinth structure between the transmission case 22 and the joint 27 more complicated, it is possible to further reduce the amount of foreign substances reaching the oil seal 53.

As shown in FIG. 7, a cylindrical side case 60 is provided on the support portion of the drive shaft 23 in the support arm 33.
The side case 60 accommodates a bearing 61 that rotatably supports the drive shaft 23 and an oil seal 62 that is disposed on both sides of the bearing 61. In the side case 60, a collar 63 having an opening corresponding to the cross-sectional shape of the drive shaft 23 and having a circular outer peripheral surface is fixed to the drive shaft 23, and a bearing 61 and an oil seal are provided on the outer peripheral surface of the collar 63. 62 is fixed.

  Protective members 64 formed in a plate-like disk shape are provided at both end portions of the collar 63. The protection member 64 is provided in contact with the outer end of the collar 63. The protection member 64 is fixed to the drive shaft 23 and is configured to be rotatable with the rotation of the drive shaft 23.

Both side ends of the side case 60 extend outward from both side ends of the collar 63. The protection member 64 extends from the outer end of the collar 63 to the outside of the outer end of the side case 60, extends radially outward from the side case 60, and further extends toward the inside of the side case 60. Is issued. In other words, the protection member 64 is provided so as to be recessed toward the inside of the side case 60 along the axial direction of the drive shaft 23, and is extended outward in the axial direction from the recessed center portion 64a. And an outer peripheral portion 64b formed by being bent in a crank shape so as to cover the outer end of the side case 60.
Thus, by providing the protective members 64 at the openings at both ends of the side case 60, the path to the oil seal 62 is formed in a labyrinth shape.

As shown in FIG. 8, dust and other foreign matter wound up by the rotation of the leveling rotor 24 and invading between the side case 60 and the leveling rotor 24 are collected near the leveling rotor 24, and then the side from the leveling rotor 24 side. Proceed toward the case 60 side.
Therefore, the path that enters the inside from the open portion of the inner end portion of the protective member 64 and goes toward the opening of the side case 60 is opposite to the traveling direction of the foreign matter (the direction from the outside of the side case 60 to the inside). . And the penetration | invasion direction which goes to the oil seal 62 from the outer side edge part of the side case 60 turns into the reverse direction further. Thus, by providing the protective member 64, the path reaching the oil seal 62 of the side case 60 has a labyrinth structure that is opposite to the traveling direction of the foreign matter.
In addition, the foreign matter travels from the leveling rotor 24 along the drive shaft 23 toward the central portion 64b of the protection member 64, and when it reaches the outer peripheral portion 64b from the central portion 64a, it needs to exceed the recess of the central portion 64a. There is. That is, resistance can be imparted to the progress of the contaminants by the protective member 64 having a concave shape at the center.

As described above, by providing the protection members 64 so as to cover the openings at both ends of the side case 60 from the outside, it is possible to effectively prevent foreign substances from entering the oil seal 62 of the side case 60.
And the protection member 64 can be rotated with respect to the side case 60 by fixing to the drive shaft 23 (rotor drive shaft 26). Thereby, the foreign substance which entered between the inner peripheral surface of the protective member 64 and the outer peripheral surface of the side case 60 from the open part of the protective member 64 can be finely crushed.

  A grease hole 66 and a grease nipple 67 that closes the grease hole 66 are provided on the upper surface of the side case 60. The internal space enclosed by the oil seal 62 in the side case 60 is filled with grease. By filling the grease in this way, even when the lip of the oil seal 62 is broken, an effect of preventing the inside from entering by the grease can be expected.

  A donut-shaped retaining ring 65 is provided outside the oil seal 62. The retaining ring 65 is fixed to the inner peripheral surface of the side case 60 and positions the oil seal 62. An additional labyrinth structure can be provided in the side case 60 by the retaining ring 65.

  1: Rice transplanter, 20: Leveling device, 22: Transmission case, 23: Drive shaft, 24: Leveling rotor, 25: Rotor input shaft, 26: Rotor drive shaft, 27: Joint, 27a: Expanded diameter part, 43: Boss Part, 53: oil seal, 54: bearing

Claims (3)

Equipped with a leveling device that is driven by the transmission of power from the engine,
The leveling device is provided with a transmission case to which power from the engine is transmitted, and a boss portion provided to protrude from both side surfaces of the transmission case to the side through an oil seal. And a plurality of leveling rotors fixed to the drive shaft,
The drive shaft includes a rotor input shaft protruding laterally from a boss portion of the transmission case, and a rotor drive shaft connected to the rotor input shaft via a joint,
A seedling transplanter characterized in that the diameter of the end of the joint on the side of the transmission case is increased to provide a diameter-enlarged portion that covers the outer end of the boss of the transmission case.   The seedling transplanter according to claim 1, wherein the transmission case is filled with lubricating oil.   The seedling transplanter according to claim 1 or 2, wherein a sliding portion for pulverizing impurities is formed between the enlarged diameter portion of the joint and the boss portion of the transmission case.

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