JP6523603B2 - Paddy work machine - Google Patents

Description

  The present invention relates to a support structure of front wheels in a paddy field work machine such as a riding type rice transplanter and a riding direct seeding machine.

In a riding type rice transplanter, which is an example of a paddy field work machine, as disclosed in Patent Document 1, the support portion (Patent Document 1) of the front axle case (10a of FIG. 5 of Patent Document 1) supported by the airframe. The front wheel support case (31 in FIG. 5 of Patent Document 1) can be steered and moved up and down around the vertical axis of 10b) in FIG. 5, and between the support portion of the front axle case and the front wheel support case There is a device provided with a suspension spring (37 of FIG. 5 of Patent Document 1).
Thus, the front wheel support case is steered to the support portion of the front axle case to steer the front wheel, and the front wheel support case is a suspension spring for the support portion of the front axle case. By moving up and down, the suspension function of the front wheel is exhibited.

Unexamined-Japanese-Patent No. 2004-330918 (refer FIG.4 and FIG.5)

In Patent Document 1, it is considered to add oil to the inside of the support portion of the front axle case and the inside of the front wheel support case to make the inside of the support portion of the front axle case and the inside of the front wheel support case into an oil bus It is done.
In this case, in Patent Document 1, the front wheel support case is moved up and down in addition to being steered and operated, so when the front wheel support case is moved upward relative to the support portion of the front axle case (the suspension spring is compressed Since the internal volume of the support of the front axle case and the internal volume of the front wheel support case decrease, the pressure inside the support of the front axle case and the internal pressure of the front wheel support case increases.
As described above, when the pressure in the inside of the support portion of the front axle case and the inside of the front wheel support case increases, lubricating oil is released from the seal member between the outer peripheral portion of the support portion of the front axle case and the outer peripheral portion of the front wheel support case There is a possibility of leakage.
The present invention is a paddy field work machine in which the front wheel support case is supported so as to be steerable and movable up and down around the vertical axis of the support portion of the front axle case. The purpose is to

[I]
(Constitution)
A first feature of the present invention resides in the following configuration of a paddy field work machine.
A front axle case supported by the airframe and a front wheel support case rotatably supporting a front wheel, wherein the front wheel support case can be steered and vertically moved about the vertical axis of the support portion of the front axle case And a suspension spring between the support portion of the front axle case and the front wheel support case,
The transmission shaft to which power is transmitted is rotatably supported upward and downward between the inside of the support portion of the front axle case and the inside of the front wheel support case, and an axle connected to the front wheel is supported by the front wheel support case. The transmission shaft and the axle are interlocked with each other by a bevel gear mechanism, and the power of the transmission shaft is transmitted to the axle via the bevel gear mechanism.
A seal member is provided between the inner peripheral surface of the support portion of the front axle case and the outer peripheral surface of the front wheel support case,
Between the outer peripheral surface of the transmission shaft and the inner peripheral surface of the front wheel support case, the Ri partition the internal space of the front and the internal space of the support part side of the axle casing the front wheel supporting case side, the lubricating oil is the front wheel A partition member for preventing entry into the inner space on the support portion side of the front axle case from the inner space on the support case side is provided so as to move up and down integrally with the front wheel support case,
Grease is put in the inner space on the support side of the front axle case, and lubricating oil is put in the inner space on the front wheel support case side.

(Function and effect of the invention)
According to the first feature of the present invention, when the front wheel support case is supported so as to be steerable and vertically movable around the vertical axis of the support portion of the front axle case, the inside of the support portion of the front axle case and the inside of the front wheel support case Is divided by the partition member into an internal space on the support portion side of the front axle case and an internal space on the front wheel support case side.
When the front wheel support case moves up and down with respect to the support of the front axle case in the above state, the partition member moves up and down together with the front wheel support case, so the volume of the internal space on the support side of the front axle case changes. However, the volume of the internal space on the front wheel support case side does not change (the pressure on the internal space on the front wheel support case side does not rise).

Thus, as in the first feature of the present invention, the front wheel support case is moved up and down with respect to the support portion of the front axle case by putting lubricating oil in the internal space on the front wheel support case side. Lubricant does not leak from the internal space on the side.
Even when the volume of the internal space on the support side of the front axle case changes (when the volume of the internal space on the support side of the front axle case changes), the pressure on the internal space on the support side of the front axle case increases Even if the grease does not leak from the seal member.
The front wheel support case is internally equipped with a bevel gear mechanism for transmitting the power of the transmission shaft to the axle, and a large diameter gear is often used for the bevel gear mechanism described above because it is necessary to obtain a large reduction ratio. It is effective to put lubricating oil in the inner space on the side in terms of lubrication of the bevel gear mechanism.

[II]
(Constitution)
A second feature of the present invention lies in the following configuration of the paddy field work machine according to the first feature of the present invention.
The partition member is a seal bearing.

(Function and effect of the invention)
According to the second feature of the present invention, since the seal bearing is located at the top of the inner space on the front wheel support case side, the bottom of the inner space on the front wheel support case side can be obtained even though lubricating oil may reach the seal bearing. Thus, the hydraulic pressure of the lubricating oil does not act on the seal bearing.
As a result, the existing space on the support side of the front axle case and the front wheel are maintained so that lubricating oil does not enter the internal space on the support side of the front axle case from the internal space on the front wheel support case by the existing member of the seal bearing. It is possible to divide the internal space on the support case side, which is advantageous in cost reduction.

[III]
(Constitution)
A third feature of the present invention resides in the following configuration of the paddy field work machine of the first feature or the second feature .
Comprising an upper bearing for rotatably supporting the transmission shaft is supported inside the supporting portion of the front axle case, and a lower bearing for rotatably supporting the transmission shaft is supported inside of the front wheel support case ,
A ring-shaped upper spring having an inner portion in contact with the lower end surface of the inner race of the upper bearing, and an outer portion located below the inner portion and separating downward from the lower end surface of the outer race of the upper bearing. The receiver is fitted onto the transmission shaft,
A ring-shaped lower spring having an inner portion in contact with the upper end surface of the inner race of the lower bearing, and an outer portion located above the inner portion and separating upward from the upper end surface of the outer race of the lower bearing The receiver is fitted on the transmission shaft,
A coil-shaped inside of the suspension spring, which is fitted on the transmission shaft over the inner portion of the upper and lower spring seat, inside of the suspension spring over the outer portion of the upper and lower spring receiving portion and a coiled outside of said suspension spring being fitted on.

(Function and effect of the invention)
[III] -1
An upper bearing supported inside the support portion of the front axle case and rotatably supporting the transmission shaft, and a lower bearing supported internally of the front wheel support case and rotatably supporting the transmission shaft when installing the outer suspension springs, since the outer diameter of the outer suspension springs is increased, so that the outside of the suspension spring approaches the outer race of the upper and lower bearing.

According to a third aspect of the present invention, it comprises an upper and a lower spring seat provided inside of the step-like and an outer portion, the attachment inside the suspension spring over the inner portion of the upper and lower spring seat, and on the It is attached outside of the suspension spring over the outer portion of the lower spring bearing portion.
In this case, while the inner portions of the upper and lower spring receiving portions are in contact with the inner races of the upper and lower bearings, the outer portion of the upper spring receiving portion is separated downward from the outer race of the upper bearing and the lower spring The outer part of the receiving part is spaced upward from the outer race of the lower bearing.

Thus, according to the third aspect of the present invention, before the case with an inner and outer suspension spring between the axle case the support and the wheel support case, the upper and lower bearing inner race, and the upper and lower the spring receiving portion, while avoiding contact and interference to the outer race of the upper and lower bearing, the inner and outer suspension spring by normally operated, it is possible to properly exhibit the front wheel suspension function.

[III] -2
According to the third feature of the present invention, the outer portion is positioned below the inner portion in the upper spring receiving portion, and the outer portion is positioned above the inner portion in the lower spring receiving portion; against receiving portion inside the suspension spring mounted over the inner portion of the outer suspension springs mounted over the outer portion of the upper and lower spring receiving portion is in the state of being compressed (upper and lower spring relative receiving unit outside the suspension spring mounted over the outer portion of the inner suspension spring mounted over the inner portion of the upper and lower spring receiving portion is in the extended state).

Thus, according to the third aspect of the present invention, even using the same spring inside and outside of the suspension spring, and as it can be given different spring characteristics on the inside and the outside of the suspension spring, the inner and outer suspension using different springs in the spring, it can give very different spring characteristics on the inside and outside of the suspension spring.
Therefore, the setting range of the suspension function of the front wheel is increased, and the appropriate setting of the suspension function of the front wheel can be easily obtained according to the type of the paddy field work machine and the like.

[III] -3
According to the third feature of the present invention, as described in the previous paragraph [III] -2, the outer portion is positioned below the inner portion in the upper spring receiving portion, and the outer side is positioned above the inner portion in the lower spring receiving portion. Due to the position of the portion, a step is generated between the inner side and the outer side of the upper spring receiving portion (between the inner side and the outer side of the lower spring receiving portion).
Thus, the step portion between the inner portion and the outer portion of the upper spring bearing portion (between the inner portion and the outer portion of the lower spring bearing portion), and in particular the position inside the suspension spring is determined, the inner and outer The suspension spring of the will work stably.

[IV]
(Constitution)
A fourth feature of the present invention lies in the following configuration of any one of the first to third features of the paddy field work machine.
The axle seal is rotatably supported by a bearing laterally inside the front wheel support case, and an axle seal is formed between the inner periphery of the front wheel support case on the front wheel side with respect to the bearing and the outer periphery of the axle. Equipped with members
The end face on the front wheel side of the front wheel support case near the outer peripheral portion of the axle and the end face on the front wheel support case side of the flange portion of the axle connected to the front wheel,
A ring-shaped first convex portion that protrudes toward the end face of the flange portion of the axle and is close to the end face of the flange portion of the axle is provided on the end face of the front wheel support case, A ring-shaped second convex portion that protrudes toward the end face of the support case and is close to the end face of the front wheel support case, is provided on the end face of the flange portion of the axle,
The first convex portion is positioned radially outward and the second convex portion is positioned radially inward. Alternatively, the first convex portion is positioned radially inward and the second convex portion is positioned radially outward. And arranging the first and second convex portions in the radial direction,
Distance in the axial direction between the top of the first projection and the end face of the flange of the axle, and in the axial direction between the top of the second projection and the end of the front wheel support case A radial distance between the first convex portion and the second convex portion is set to be large.

(Function and effect of the invention)
According to the fourth feature of the present invention, the labyrinth portion by the first and second convex portions is formed between the end face of the front wheel support case and the end face of the flange portion of the axle on the outside of the axle seal member. It is stopped by the labyrinth part by the 1st and 2nd convex part, and it becomes difficult to reach an axle seal member. Thus mud less likely to reach the axle seal member, it is possible to improve the durability of the axle seal member.

  According to the fourth feature of the present invention, in the labyrinth portion by the first and second convex portions, the axial direction distance between the top of the first convex portion and the end face of the flange portion of the axle, and the second convex portion The distance between the first and second protrusions in the radial direction is set to be larger than the distance between the top and the end face of the front wheel support case in the axial direction. A ring-shaped space is formed between the projection and the projection.

Thus, according to the fourth aspect of the present invention, even if muddy water intrudes into the labyrinth portion by the first and second convex portions, the muddy water is retained in the ring-shaped space described above, so The state of reaching the axle seal member by passing through the labyrinth portion by the first and second convex portions is reduced, and muddy water is bitten into the narrow portion of the labyrinth portion by the first and second convex portions. The situation where the end face of the case and the end face of the flange portion of the axle are damaged is also reduced.

[V]
(Constitution)
According to a fifth aspect of the present invention, there is provided a paddy field machine according to the fourth aspect of the present invention as follows.
The first and second convex portions are arranged in the radial direction such that the first convex portion is radially inward and the second convex portion is radially outward.
A ring-shaped third convex portion that protrudes toward the end face of the flange portion of the axle and is close to the end face of the flange portion of the axle and is positioned radially outward of the second convex portion To the end face of the front wheel support case,
Distance in the axial direction between the top of the second protrusion and the end face of the front wheel support case, and distance between the top of the third protrusion and the end of the flange of the axle in the axial direction A radial interval between the second convex portion and the third convex portion is set to be large.

(Function and effect of the invention)
According to the fifth feature of the present invention, in addition to the ring-shaped space being formed between the first convex portion and the second convex portion, the third convex portion is provided on the radially outer side of the second convex portion. A ring-shaped space is formed between the second convex portion and the third convex portion.

Thus, according to the fifth aspect of the present invention, when muddy water intrudes into the labyrinth portion by the first, second and third convex portions, the muddy water is held in the two ring-shaped spaces described above, whereby the muddy water is an axle The state of reaching the seal member is further reduced, and muddy water bites into the narrow portion of the labyrinth portion by the first, second and third convex portions, and the end face of the front wheel support case and the end face of the flange portion of the axle are scratched. It is even less likely to be

[VI]
(Constitution)
A sixth feature of the present invention resides in the following configuration of the paddy field work machine according to the fifth feature of the present invention.
The position between the top of the first convex portion and the end face of the flange of the axle is in the axial direction, rather than the position between the top of the third convex portion and the end face of the flange of the axle And the side away from the axle seal member.

(Function and effect of the invention)
When muddy water intrudes into the labyrinth portion by the first and second convex portions and tries to reach the axle seal member from the ring-shaped space between the first convex portion and the second convex portion, the sixth aspect of the present invention According to the feature, the passage from the ring-shaped space between the first convex portion and the second convex portion to the axle seal member (between the top of the first convex portion and the end face of the flange portion of the axle ) As it is far from the seal member, it is difficult for mud to reach the axle seal member from the above-mentioned ring-shaped space.

[VII]
(Constitution)
The 7th feature of the present invention is to constitute as follows in the paddy field operation machine of the 4th feature of the present invention.
The first and second convex portions are arranged in the radial direction so that the first convex portion is positioned radially outward and the second convex portion is positioned radially inward.
A ring-shaped third convex portion that protrudes toward the end face of the front wheel support case and is close to the end face of the front wheel support case, and is positioned radially outward of the first convex portion. In the end face of the flange portion of the axle,
Distance in the axial direction between the top of the first projection and the end face of the flange of the axle, and in the axial direction between the top of the third projection and the end of the front wheel support case A radial distance between the first convex portion and the third convex portion is set to be large.

(Function and effect of the invention)
According to the seventh aspect of the present invention, in addition to the ring-shaped space being formed between the first convex portion and the second convex portion, the third convex portion is provided on the radially outer side of the first convex portion. A ring-shaped space is formed between the first convex portion and the third convex portion.

Thus, according to the seventh aspect of the present invention, when muddy water intrudes into the labyrinth portion by the first, second and third convex portions, the muddy water is held in the two ring-shaped spaces described above, whereby the muddy water is an axle The state of reaching the seal member is further reduced, and muddy water bites into the narrow portion of the labyrinth portion by the first, second and third convex portions, and the end face of the front wheel support case and the end face of the flange portion of the axle are scratched. It is even less likely to be

[VIII]
(Constitution)
An eighth feature of the present invention resides in the following configuration in any one of the first to seventh features of the paddy field work machine.
In those supporting a front wheel of the right from the front of the machine body and extends out the right of the front axle case to the right, from the front of the aircraft in it supports the front wheel left the left that extends to the left And a front axle case,
In the front and rear of the right front axle case, and in the front and rear of the left front axle case, through holes of the same diameter facing in the front-rear direction are formed,
Attach a closing member capable of closing and opening the through hole in the front through hole of the right and left front axle case, and apply a grease nipple to the through hole in the rear of the right and left front axle case Is attached.

(Function and effect of the invention)
According to the eighth feature of the present invention, since the through holes having the same diameter are formed in one part and the other part of the front axle case, when the front axle case is used as a right front axle case, the front axle is used. If the through hole of one part of the case is located at the front, a closing member is attached to this through hole, and if the through hole of the other part of the front axle case is located at the rear, a nipple is attached to this through hole.
Similarly, when the front axle case is used as a left front axle case, if the through hole of the other part of the front axle case is located at the front, a blocking member is attached to this through hole, and one part of the front axle case If the through hole is located at the rear, attach the nipple to this through hole.

Thereby, according to the eighth feature of the present invention, the front of the right and left front axle cases is used whether the same front axle case is used as the right front axle case or as the left front axle case A closing member can be attached to the through hole of the rear nipple, and a nipple can be attached to the through hole at the rear of the right and left front axle cases, so that the front axle case is shared with the right and left front axle cases Can. Therefore, the front axle case can be shared with the right and left front axle cases, and parts sharing and cost reduction can be achieved.
In this case, attaching the nipples to the through holes in the rear of the right and left front axle cases is because muddy water is likely to adhere to the front of the right and left front axle cases when the aircraft moves forward. To reduce the adhesion of

It is a whole side view of a riding type rice transplanter. It is a schematic plan view which shows the transmission system to a front wheel and a rear wheel. It is a vertical front view of the support part of front axle case, and a front wheel support case. It is a longitudinal front view near the support part of front axle case, and the inside and the outside suspension spring in front wheel support case. It is a disassembled perspective view of the support part of front axle case, and a front wheel support case. It is a side view of a lid of a front axle case. It is a longitudinal cross-sectional front view which shows the seal structure between a cover part (advancing support case) and an axle. In 2nd another form of implementation of an invention, it is a vertical elevation front view which shows the seal structure between a cover part (advancing support case) and an axle. In 3rd another form of implementation of an invention, it is a vertical elevation front view which shows the seal structure between a lid part (advancing support case) and an axle.

[1]
As shown in FIG. 1, a hydraulic cylinder 4 for moving the link mechanism 3 and the link mechanism 3 up and down is provided at the rear of the vehicle body provided with the right and left front wheels 1 and the right and left rear wheels 2. A seedling planting device 5 is supported at the rear of the mechanism 3 to configure a riding type rice planter which is an example of a paddy field work machine.

As shown in FIG. 1, the seedling planting device 5 includes a transmission case 6, a rotation case 7 rotatably supported at the rear right and left portions of the transmission case 6, and a pair of rotation cases 7 provided at both ends. The planting arm 8, the ground contact float 9, and the seedling platform 10 are provided. Thereby, as the seedling platform 10 is driven to reciprocate laterally from side to side, the rotary case 7 is rotationally driven, and the planting arms 8 alternately take out the seedlings from the lower part of the seedling platform 10 and plant them on the field .

  As shown in FIG. 1, a delivery unit 12 and a hopper 13 are provided at the rear of the driver's seat 11, and a blower 14 is provided at the left lateral side. A hose 16 is connected to 12 to constitute a fertilizing device 17. As a result, the fertilizer stored in the hopper 13 is fed out by the feeding portion 12, supplied from the hose 16 to the groover 15 by the wind of the blower 14, and supplied to the groove formed on the rice field by the groover 15. .

[2]
Next, a transmission system to the right and left front wheels 1, a transmission system to the right and left rear wheels 2, and a transmission system to the seedling planting device 5 will be described.
As shown in FIGS. 1 and 2, a transmission case 18 is provided at the front of the airframe, and an engine 19 is supported at the front of the transmission case 18. The right and left front axle cases 20 are connected to the right and left lateral sides of the transmission case 18, and the right and left front wheels 1 are supported by the right and left front axle cases 20.

  As shown in FIG. 2, the hydrostatic stepless transmission 21 is connected to the front upper part of the left lateral side of the transmission case 18, and the power of the output shaft 19a of the engine 19 is the hydrostatic stepless. It is transmitted to the input shaft 21 a of the transmission 21 via the transmission belt 23. The hydrostatic continuously variable transmission 21 is provided with a neutral stop position, and is configured to be able to change gears steplessly on the forward side and the reverse side. In the transmission case 18, the transmission shaft 22 is rotatably supported, and the output shaft 21b of the hydrostatic continuously variable transmission 21 and the transmission shaft 22 are connected.

As shown in FIG. 2, the low speed gear 24 and the high speed gear 25 are fixed to the transmission shaft 22, and the shift gear 27 is integrated with the transmission shaft 26 with a spline structure to the transmission shaft 26 disposed parallel to the transmission shaft 22. It is rotatably and slidably fitted. As a result, the power of the output shaft 21b of the hydrostatic continuously variable transmission 21 and the transmission shaft 22 is shifted into two stages of height by sliding the shift gear 27 and engaging the low speed gear 24 and the high speed gear 25. It is transmitted to the transmission shaft 26.
Thereby, as shown in FIG. 2, the power of the transmission shaft 26 is transmitted to the front wheel differential mechanism 30 via the transmission gears 28 and 29, and from the transmission shaft 31 supported by the right and left front axle cases 20, right and left. It is transmitted to the left front wheel 1.

As shown in FIG. 1 and FIG. 2, the rear axle case 32 is supported so as to be able to roll around the longitudinal center axis P1 in the left and right center of the rear of the machine, and the right and left rear wheels 2 are supported by the rear axle case 32 It is done. The power of the front wheel differential mechanism 30 is transmitted from the output gear 30a of the front wheel differential mechanism 30 to the input shaft 35 provided on the rear axle case 32 through the output shaft 33 provided on the transmission case 18 and the transmission shaft 34. Ru.
Thus, the power of the input shaft 35 is transmitted to the right and left rear wheels 2 through a transmission shaft (not shown) provided on the rear axle case 32 and right and left side clutches (not shown). Ru. The output shaft 33 is provided with a friction multi-plate type brake 36, and by operating the brake 36 in a braking state, the right and left front wheels 1 and the right and left rear wheels 2 can be braked.

  As shown in FIG. 2, the transmission gear 37 is externally fitted to the transmission shaft 22 through the one-way clutch 38, and the forward power of the output shaft 21b of the hydrostatic stepless transmission 21 is transmitted by the one-way clutch 38. It is transmitted to 37. The transmission gear 39 and the plurality of transmission gears 40 are connected to one another so as to rotate integrally, and the transmission gears 39, 40 are fitted on the transmission shaft 26 so as to be relatively rotatable, and the transmission gears 37, 39 are engaged. There is.

  As shown in FIG. 1 and FIG. 2, an inter-train transmission (not shown) is constituted by the transmission gears 39 and 40 and a transmission gear (not shown) on the transmission lower side engaged with the transmission gear 40. The power of the transmission gear 37 is transmitted to the seedling planting device 5 via the transmission gear 39, the inter-gear transmission, the planting clutch (not shown) and the transmission shaft 41.

[3]
Next, a support structure of the front wheel support case 51 by the support portion 20 a of the front axle case 20 and a transmission structure to the front wheel 1 will be described.
As shown in FIGS. 2 and 3, a cylindrical support portion 20 a is integrally formed downward at the end of the front axle case 20, and the transmission shaft 31 is supported by the bearing 42 so as to extend from the front axle case 20. The support portion 20a of the front axle case 20 is inserted. A seal member 43 is attached to a portion of the transmission shaft 31 on the front axle case 20 side with respect to the bearing 42, and a bevel gear 44 is fixed to an end portion of the transmission shaft 31.

  As shown in FIGS. 2 and 3, the seal bearing 46 and the seal bearing 47 (corresponding to the upper bearing) are supported by the support portion 20a of the front axle case 20, and the sleeve 48 is supported by the seal bearing 46. The bevel gear 49 is supported by the bearing 47, and the bevel gears 44, 49 are engaged. As shown in FIG. 4, the position of the seal bearing 47 in the support portion 20 a of the front axle case 20 is determined by the stopper ring 58 in contact with the outer race 47 b of the seal bearing 47.

As shown in FIGS. 2 and 3, the transmission shaft 45 (corresponding to the transmission shaft) is disposed upward and downward inside the support portion 20a of the front axle case 20, and the spline portion 45a at the top of the transmission shaft 45 is a sleeve The transmission shaft 45 is supported rotatably and vertically movably around the vertical axis P2 of the support portion 20a of the front axle case 20. A cap 50 is provided on the upper portion of the support portion 20 a of the front axle case 20, and when the transmission shaft 45 moves upward, the upper portion of the transmission shaft 45 enters the cap 50.

  As shown in FIGS. 2 and 3, a front wheel support case 51 for rotatably supporting the front wheel 1 is provided, and a sleeve 51 a connected to an upper portion of the front wheel support case 51 enters the support portion 20 a of the front axle case 20. It is. A seal member 52 is provided between the outer peripheral portion (inner peripheral surface) of the support portion 20 a of the front axle case 20 and the outer peripheral portion (outer peripheral surface) of the sleeve 51 a of the front wheel support case 51.

  As shown in FIGS. 3 and 4, the transmission shaft 45 is disposed upward and downward across the inside of the support portion 20 a of the front axle case 20 and the inside of the front wheel support case 51. A seal bearing 53 (corresponding to a partition member) (corresponding to a lower bearing) and an open bearing 54 are provided between the transmission shaft 45 and the front wheel support case 51, and the transmission shaft 45 includes the seal bearing 53 and the bearing 54. Thus, the front wheel support case 51 rotatably supports the front wheel support case 51. The positions of the seal bearing 53 and the bearing 54 in the front wheel support case 51 are determined by the stopper ring 59 in contact with the outer race 53 b of the seal bearing 53 and the collar 60 in contact with the inner race 53 a of the seal bearing 53.

As shown in FIGS. 2 and 3, the axle 55 is rotatably supported laterally inside the front wheel support case 51 by an open bearing 56, and is a disc of the axle 55 located outside the front wheel support case 51. The front wheel 1 is connected to the flange portion 55a shaped like a circle. Inside the front wheel support case 51, a bevel gear 57 (corresponding to a bevel gear mechanism) is connected to the axle 55, and a bevel gear 45b (corresponding to a bevel gear mechanism) of the transmission shaft 45 is engaged with the bevel gear 57.
With the above structure, the power of the transmission shaft 31 is transmitted to the front wheel 1 via the bevel gears 44 and 49, the transmission shaft 45, the bevel gear 45b of the transmission shaft 45, the bevel gear 57 and the axle 55.

[4]
Next, the suspension structure of the front wheel 1 will be described.
As shown in FIG. 4, an upper spring receiving portion 61 is provided to the seal bearing 47. The upper spring receiving portion 61 is an inner portion 61a in contact with the lower end surface of the inner race 47a of the seal bearing 47, and a lower end surface of the outer race 47b (stopper ring 58) of the seal bearing 47 located below the inner portion 61a. And an outer portion 61b which is separated from the lower side, and is configured in a ring shape, and is externally fitted to the transmission shaft 45.

  As shown in FIG. 4, a lower spring receiving portion 62 is provided for the seal bearing 53. The lower spring receiving portion 62 is an inner portion 62a in contact with the upper end surface of the inner race 53a of the seal bearing 53, and an upper end surface of the outer race 53b (stopper ring 59) of the seal bearing 53 located above the inner portion 62a. And an outer side portion 62b which is separated upward from the lower end of the transmission shaft 45.

As shown in FIG. 4, a coil-shaped inner suspension spring 63 (corresponding to a suspension spring) is externally fitted to the transmission shaft 45 over the inner portions 61 a and 62 a of the upper and lower spring receiving portions 61 and 62. It is equipped. A coiled outer suspension spring 64 (corresponding to a suspension spring) is provided over the outer portions 61 b and 62 b of the upper and lower spring receiving portions 61 and 62 so as to be fitted to the inner suspension spring 63.
With the above structure, the front wheel support case 51 (front wheel 1) is steerably supported around the vertical axis P2 of the support portion 20a of the front axle case 20, and the vertical axis P2 of the support portion 20a of the front axle case 20. It is supported vertically movable in the direction of.

  In this case, as shown in FIGS. 3 and 4, the upper and lower spring receiving portions 61, 62 are attached to the inner suspension spring 63 attached across the inner portions 61a, 62a of the upper and lower spring receiving portions 61, 62. The outer suspension spring 64 attached over the outer portions 61b and 62b of the upper and lower spring receiving portions 61b and 62b is compressed (the outer suspension spring 64 attached over the outer portions 61b and 62b of the upper and lower spring receiving portions 61 and 62). On the other hand, the inner suspension spring 63 attached across the inner portions 61a and 62a of the upper and lower spring receiving portions 61 and 62 is in an extended state).

  As shown in FIG. 4, a step is formed between the inner side 61a and the outer side 61b of the upper spring receiving portion 61, and a step is formed between the inner side 62a and the outer side 62b of the lower spring receiving portion 62. In particular, the inner suspension spring 63 is formed by the stepped portion between the inner portion 61a and the outer portion 61b of the upper spring receiving portion 61 and the stepped portion between the inner portion 62a and the outer portion 62b of the lower spring receiving portion 62. The position of is determined.

[5]
Next, the lubrication of the front axle case 20 and the front wheel support case 51 will be described.
As shown in FIG. 5, in the right front axle case 20 connected to the right lateral side of the transmission case 18 and the left front axle case 20 connected to the left lateral side of the transmission case 18, Through holes 20b having the same diameter in the front-rear direction in the front part and the rear of the upper part of the support part 20a of the right front axle case 20 and in the front part and the rear of the upper part of the support part 20a of the left front axle case 20, 20c are formed, and the right and left front axle cases 20 are identical front axle cases 20.

  Thereby, as shown in FIG. 2 and FIG. 5, when the front axle case 20 is used as the left front axle case 20, the packing 65 and the bolt are formed in the through holes 20b located at the front of the left front axle case 20. 66 (equivalent to a closing member) is attached to close the through hole 20b of the left front axle case 20, and a nipple 67 for injecting grease is attached to the through hole 20c located at the rear of the left front axle case 20 .

  When the front axle case 20 is used as the right front axle case 20, the through hole 20c of the left front axle case 20 becomes the through hole 20c located at the front of the right front axle case 20. A packing 65 and a bolt 66 (corresponding to a closing member) are attached to the through hole 20 c of the case 20 to close the through hole 20 c of the right front axle case 20. Conversely, since the through hole 20b of the left front axle case 20 becomes the through hole 20b located at the rear of the right front axle case 20, the nipple 67 for injecting grease into the through hole 20b of the right front axle case 20 Attach the.

As shown in FIG. 3, lubricating oil is contained in a portion (a portion on the right side of the drawing sheet of the sealing member 43 shown in FIG. 3 ) of the front axle case 20 excluding the support portion 20 a.
Grease is injected from the nipple 67 (in this case, the bolt 66 shown in FIG. 5 is removed) on the upper portion of the support portion 20a of the front axle case 20 (portion between the seal bearing 46 and the seal bearing 47). Grease is injected while removing air from the support portion 20a of the front axle case 20, and when the injection of the grease is completed, a bolt 66 is attached). When the front wheel support case 51 is attached to the support portion 20a of the front axle case 20, grease is injected into the lower portion of the support portion 20a of the front axle case 20 (portion between the seal bearing 47 and the seal bearing 53). (This corresponds to a state in which the internal space on the side of the support portion 20a of the front axle case 20 is greased).

  In this case, as shown in FIGS. 3 and 4, the grease injected into the upper portion of the support portion 20a of the front axle case 20 (the portion between the seal bearing 46 and the seal bearing 47) It is difficult to go to the lower portion of the support portion 20 a of the axle case 20 (the portion between the seal bearing 47 and the seal bearing 53). As a result, in the bevel gears 44 and 49 and the spline portion 45a of the transmission shaft 45, the shortage of grease is less likely to occur.

  As shown in FIG. 3, the front wheel support case 51 (the lower portion of the seal bearing 53) is filled with lubricating oil, and the position of the lubricating oil level (oil level) is a position just below the bearing 54. (This corresponds to a state in which the inner space on the front wheel support case 51 side is filled with lubricating oil). A drain bolt 69 is provided at the lower part of the front wheel support case 51, and by removing the bolt 69, the lubricating oil of the front wheel support case 51 (the lower portion of the seal bearing 53) can be drained.

In this case, as shown in FIG. 3, when the front wheel support case 51 moves up and down with respect to the support portion 20 a of the front axle case 20, the seal bearing 53 moves up and down together with the front wheel support case 51. While the volume of the internal space on the side of the support portion 20a changes, the volume of the internal space on the front wheel support case 51 side does not change.
Therefore, even if the front wheel support case 51 moves up and down with respect to the support portion 20a of the front axle case 20 by putting lubricating oil in the front wheel support case 51 (the lower portion of the seal bearing 53), the front wheel support case 51 ( The lubricating oil does not leak from the lower portion of the seal bearing 53).

[6]
Next, the lid 68 of the front wheel support case 51 will be described.
As shown in FIGS. 3, 5 and 6, a lid 68 through which the axle 55 penetrates and which covers the front wheel 1 side of the front wheel support case 51 is provided as a part of the front wheel support case 51. A bearing 56 and a seal member 70 (corresponding to an axle seal member) are supported at 68. Eight connecting portions 68a are formed on the same circular portion centering on the axle shaft 55 in the lid portion 68 so as to project radially outward from the outer peripheral portion of the lid portion 68 at equal pitches. Hole 68b is formed.

As shown in FIGS. 3, 5 and 6, in the front wheel support case 51, eight screw holes 51b are formed at the same positions as the bolt holes 68b of the lid 68, and the bolt holes 86b of the lid 68 and the front wheel support A bolt 71 is attached to the screw hole 51 b of the case 51, and the lid 68 is connected to the front wheel support case 51.
Thereby, the bolt hole 68b of the lid 68 and the lid 68 can be positioned at any mounting phase of 360 degrees without being restricted by the mounting phase (attachment direction) of the lid 68 around the axle 55. The lid portion 68 can be easily connected to the front wheel support case 51 by the bolt 71 simply by aligning the screw holes 51b of the front wheel support case 51 with each other.

As shown in FIGS. 5 and 6, in the lid 68, wall-like (plate-like) removal parts 68c are formed across a pair of adjacent connection parts 68a, and the pair of removal parts 68c are lid 68 It is provided at a 180-degree symmetrical position across the axle 55 at.
Thus, when the lid 68 is fixed to the front wheel support case 51 when the bolt 71 is removed and the lid 68 is removed from the front wheel support case 51, the lid 68 can not be easily removed from the front wheel support case 51, After the bolt 71 is removed, the lid 68 can be easily removed from the front wheel support case 51 by applying a tool such as a hammer to the removal portion 68 c of the lid 68.

[7]
Next, the seal structure between the lid 68 (front wheel support case 51) and the axle 55 will be described.
As shown in FIG. 3 and FIG. 7, the axle shaft 55 is rotatably supported by the bearing 56 laterally inside the lid portion 68 (front wheel support case 51), and the lid portion 68 on the front wheel 1 side with respect to the bearing 56 (front wheel A seal member 70 is provided between the inner periphery of the support case 51) and the outer periphery of the axle 55.

As shown in FIGS. 6 and 7, the end face of the cover 68 (front wheel support case 51) on the front wheel 1 side near the outer periphery of the axle 55 projects toward the end face of the flange 55 a of the axle 55 to A ring-shaped first convex portion 68 d centered on the axle 55 is provided on the end face of the lid 68 (front wheel support case 51) so as to be close to the end face of the flange 55 a.
The end face of the flange 55a of the axle 55 on the lid 68 (front wheel support case 51) side protrudes toward the end face of the lid 68 (front wheel support case 51) and approaches the end face of the lid 68 (front wheel support case 51) A ring-shaped second convex portion 55 b centered on the axle 55 is provided on the end face of the flange 55 a of the axle 55.

  As shown in FIGS. 6 and 7, the lid 68 (the front wheel support case 51) is positioned such that the first convex portion 68d of the lid 68 (the front wheel support case 51) is radially outward and the second convex portion 55b of the axle 55 is radially inward The first convex portion 68 d of the portion 68 (front wheel support case 51) and the second convex portion 55 b of the axle 55 are concentrically arranged in the radial direction.

  As shown in FIG. 7, a distance W1 in the axial direction between the top of the first protrusion 68 d of the lid 68 (front wheel support case 51) and the end face of the flange 55 a of the axle 55, and the second axle 55 The first convex portion 68 d of the lid 68 (front wheel support case 51) and the second of the axle 55 are more than the distance W2 in the axial direction between the top of the convex portion 55 b and the end face of the lid 68 (front wheel support case 51). A distance W3 in the radial direction from the convex portion 55b is set to be large.

  Thus, as shown in FIG. 7, the cover 68 (front wheel support) is provided between the end face of the cover 68 (front wheel support case 51) and the end face of the flange 55a of the axle 55 on the outside in the radial direction of the seal member 70. Since a labyrinth portion is formed by the first convex portion 68 d of the case 51) and the second convex portion 55 b of the axle 55, the muddy water is made of the first convex portion 68 d of the labyrinth portion (the lid 68 (front wheel support case 51)) The second projection 55 b) prevents the seal member 70 from reaching the seal member 70.

As shown in FIG. 7, in the labyrinth portion (the first convex portion 68d of the lid portion 68 (front wheel support case 51) and the second convex portion 55b of the axle 55), the first convex portion of the lid portion 68 (front wheel support case 51) A ring-shaped space is formed between the portion 68 d and the second convex portion 55 b of the axle 55.
Thereby, even if muddy water intrudes into the labyrinth portion (the first convex portion 68 d of the lid portion 68 (front wheel support case 51) and the second convex portion 55 b of the axle shaft 55), the muddy water is held in the above-mentioned ring-shaped space Since the muddy water passes through the labyrinth (the first projection 68d of the lid 68 (front wheel support case 51) and the second projection 55b of the axle 55) to reach the seal member 70 in a small number of cases. Become.
Mud water is bitten into the narrow portions of the labyrinth portion (the first convex portion 68d of the lid portion 68 (front wheel support case 51) and the second convex portion 55b of the axle 55), and the lid portion 68 (end face of the front wheel support case) The situation where the end face of the flange 55a of the axle 55 is damaged is also reduced.

[First alternative embodiment of the invention]
In the structures of FIGS. 6 and 7 of the above-described [Embodiment of the Invention], the first convex portion 68d of the lid portion 68 (front wheel support case 51) is radially inward and the second convex portion 55b of the axle 55 Even if the first convex portion 68 d of the lid portion 68 (front wheel support case 51) and the second convex portion 55 b of the axle shaft 55 are concentrically arranged in a radial direction such that Good.

Second Embodiment of the Invention
When configured as in the above-mentioned [first embodiment of the invention], as shown in FIG. 8, it projects toward the end face of flange 55 a of axle 55 and approaches the end face of flange 55 a of axle 55. Even if a ring-shaped third convex portion 68e centering on the axle 55 is provided on the end face of the lid 68 (front wheel support case 51) so as to be positioned radially outside the second convex portion 55b of the axle 55 Good.

  As shown in FIG. 8, an axial distance W2 between the top of the second projection 55b of the axle 55 and the end face of the lid 68 (front wheel support case 51), and the lid 68 (front wheel support case 51) Of the second convex portion 55b of the axle 55 and the lid 68 (the front wheel support case 51) than the distance W4 in the axial direction between the top of the third convex portion 68e and the end face of the flange 55a of the axle 55; A distance W5 in the radial direction from the convex portion 68e is set to be large.

  As shown in FIG. 8, the lid 68 (front wheel support case 51) is located at a position between the top of the third projection 68 e of the lid 68 (front wheel support case 51) and the end face of the flange 55 a of the axle 55. The position between the top of the first convex portion 68d) and the end face of the flange portion 55a of the axle 55 is located on the side away from the seal member 70 in the axial direction (left in FIG. 8).

As shown in FIG. 8, a ring-shaped space is formed between the second convex portion 55 b of the axle 55 and the third convex portion 68 e of the lid 68 (front wheel support case 51), and the lid 68 (front wheel support case A ring-shaped space is formed between the first convex portion 68 d of 51) and the second convex portion 55 b of the axle 55.
In this case, the first convex portion 68 d of the lid 68 (front wheel support case 51) is more than the space between the second convex portion 55 b of the axle 55 and the third convex portion 68 e of the lid 68 (front wheel support case 51). And the space between the second convex portion 55b of the axle 55 are long in the axial direction (the volume is large).

[Third Embodiment of the Invention]
When configured as shown in FIG. 6 and FIG. 7 of the above-mentioned [embodiments for carrying out the invention], as shown in FIG. 9 , the lid projects toward the end face of the lid 68 (front wheel support case 51) A ring-shaped third convex portion 55c, which is close to the end face of the front wheel support case 51 and is centered on the axle 55, radially outward of the first convex portion 68d of the lid portion 68 (front wheel support case 51) You may provide in the end surface of the flange part 55a of the axle shaft 55 so that it may be located.

  As shown in FIG. 9, a distance W1 in the axial direction between the top of the first projection 68 d of the lid 68 (front wheel support case 51) and the end face of the flange 55 a of the axle 55, and a third of the axle 55 The first convex portion 68 d of the lid 68 (front wheel support case 51) and the third of the axle shaft 55 are closer than the distance W6 in the axial direction between the top of the convex portion 55 c and the end face of the lid 68 (front wheel support case 51). The radial distance W7 from the convex portion 55c is set to be large.

  As shown in FIG. 9, the top of the third convex portion 55 c of the axle 55 and the lid 68 are more than the position between the second convex portion 55 b of the axle 55 and the end face of the lid 68 (front wheel support case 51). The position between the end face of (the front wheel support case 51) and the end face of the front wheel support case 51 is located on the side away from the front wheel 1 in the axial direction (right side in FIG. 9).

As shown in FIG. 9, a ring-shaped space is formed between the first projection 68d of the cover 68 (front wheel support case 51) and the third projection 55c of the axle 55, and the cover 68 (front wheel support case) A ring-shaped space is formed between the first convex portion 68 d of 51) and the second convex portion 55 b of the axle 55.
In this case, the first convex portion 68 d of the lid 68 (front wheel support case 51) is more than the space between the first convex portion 68 d of the lid 68 (front wheel support case 51) and the second convex portion 55 b of the axle 55. And the third convex portion 55c of the axle 55 are long in the axial direction (the volume is large).

Fourth Alternative Embodiment of the Invention
In the above-described [Embodiments for Carrying Out the Invention] [First Embodiment of the Invention] to [Third Embodiment of the Invention], the following (1) to (5) are adopted to configure It is also good.
(1) In FIGS. 3 and 4, the seal bearing 53 is changed to an open type bearing, and the lower (or upper) bearing 54 of the two bearings 54 is changed to a seal bearing. In such a configuration, the seal bearing 47 may be changed to an open bearing.
(2) In FIGS. 3 and 4, in the preceding paragraph (1), a disk-like (ring-like) member is externally fitted on the transmission shaft 45 in place of the seal bearing to form a partition member.
(3) In FIGS. 3, 5 and 6, six bolt holes 68b may be formed in the lid 68, or ten bolt holes 68b may be formed.
(4) In FIGS. 3, 5, 6 and in the preceding paragraph (3), one removal portion 68c may be formed in the lid 68, or three removal portions 68c may be formed.
(5) The rear axle case 32 may be configured to be supported by a 5-link type suspension mechanism instead of supporting the rear axle case 32 rollably around the longitudinal axis P1.

  The present invention can be applied not only to a riding type rice transplanter equipped with a seedling planting device at the rear of the airframe, but also to a riding type direct seeding machine equipped with a direct seeding device at the rear of the airframe.

1 front wheel 20 front axle case 20a front axle case supporting portions 20b, 20c front axle case of the through hole 45 transmission shaft 45b, 57 bevel gear mechanism 47 upper bearing 47a outer race 51 front wheel support cases of the inner race 47b the upper bearing of the upper bearing
52 seal member 53 partition member, seal bearing, lower bearing 53a lower bearing inner race 53b lower bearing outer race 55 axle 55a axle flange 55b second convex 56 bearing 61 upper spring receiving portion 61a upper spring receiving portion inside part 61b on the spring receiving portion of the outer part 62 below the spring receiving portion 62a under the spring receiving portion of the inner portion 62b under the spring receiving portion of the outer part 63 suspension spring, inside of the suspension spring 64 suspension spring, the outer suspension spring 66 closing member 67 nipple
68d first convex portion 68e , 55c third convex portion 70 axle seal member
P2 vertical axis W1 Distance in the axial direction between the top of the first protrusion and the end face of the flange of the axle W2 Distance in the axial direction between the top of the second protrusion and the end of the front wheel support case W3 First Radial distance between the convex portion and the second convex portion W4 Axial distance between the top of the third convex portion and the end face of the flange portion of the axle W5 Radial direction between the second convex portion and the third convex portion Distance W6 Distance in the axial direction between the top of the third protrusion and the end face of the front wheel support case W7 Distance between the first and third protrusions in the radial direction

Claims (8)

A front axle case supported by the airframe and a front wheel support case rotatably supporting a front wheel, wherein the front wheel support case can be steered and vertically moved about the vertical axis of the support portion of the front axle case And a suspension spring between the support portion of the front axle case and the front wheel support case,
The transmission shaft to which power is transmitted is rotatably supported upward and downward between the inside of the support portion of the front axle case and the inside of the front wheel support case, and an axle connected to the front wheel is supported by the front wheel support case. The transmission shaft and the axle are interlocked with each other by a bevel gear mechanism, and the power of the transmission shaft is transmitted to the axle via the bevel gear mechanism.
A seal member is provided between the inner peripheral surface of the support portion of the front axle case and the outer peripheral surface of the front wheel support case,
Between the outer peripheral surface of the transmission shaft and the inner peripheral surface of the front wheel support case, the Ri partition the internal space of the front and the internal space of the support part side of the axle casing the front wheel supporting case side, the lubricating oil is the front wheel A partition member for preventing entry into the inner space on the support portion side of the front axle case from the inner space on the support case side is provided so as to move up and down integrally with the front wheel support case,
A paddy work machine in which grease is put in the inner space on the support side of the front axle case and lubricating oil is put in the inner space on the front wheel support case side.   The paddy field work machine according to claim 1, wherein the partition member is a seal bearing. It has an upper bearing supported inside the support portion of the front axle case to rotatably support the transmission shaft, and a lower bearing supported inside the front wheel support case to rotatably support the transmission shaft. ,
A ring-shaped upper spring having an inner portion in contact with the lower end surface of the inner race of the upper bearing, and an outer portion located below the inner portion and separating downward from the lower end surface of the outer race of the upper bearing. The receiver is fitted onto the transmission shaft,
A ring-shaped lower spring having an inner portion in contact with the upper end surface of the inner race of the lower bearing, and an outer portion located above the inner portion and separating upward from the upper end surface of the outer race of the lower bearing The receiver is fitted on the transmission shaft,
The coiled inner suspension spring externally fitted to the transmission shaft is provided over the inner portions of the upper and lower spring receiving portions, and the inner suspension spring is provided over the outer portions of the upper and lower spring receiving portions. The paddy field operation machine according to claim 1 or 2, further comprising: a coiled outer suspension spring externally fitted to the outer surface. The axle seal is rotatably supported by a bearing laterally inside the front wheel support case, and an axle seal is formed between the inner periphery of the front wheel support case on the front wheel side with respect to the bearing and the outer periphery of the axle. Equipped with members
The end face on the front wheel side of the front wheel support case near the outer peripheral portion of the axle and the end face on the front wheel support case side of the flange portion of the axle connected to the front wheel,
A ring-shaped first convex portion that protrudes toward the end face of the flange portion of the axle and is close to the end face of the flange portion of the axle is provided on the end face of the front wheel support case, A ring-shaped second convex portion that protrudes toward the end face of the support case and is close to the end face of the front wheel support case, is provided on the end face of the flange portion of the axle,
The first convex portion is positioned radially outward and the second convex portion is positioned radially inward. Alternatively, the first convex portion is positioned radially inward and the second convex portion is positioned radially outward. And arranging the first and second convex portions in the radial direction,
Distance in the axial direction between the top of the first projection and the end face of the flange of the axle, and in the axial direction between the top of the second projection and the end of the front wheel support case The paddy field operation machine according to any one of claims 1 to 3, wherein a radial distance between the first convex portion and the second convex portion is set to be large. The first and second convex portions are arranged in the radial direction such that the first convex portion is radially inward and the second convex portion is radially outward.
A ring-shaped third convex portion that protrudes toward the end face of the flange portion of the axle and is close to the end face of the flange portion of the axle and is positioned radially outward of the second convex portion To the end face of the front wheel support case,
Distance in the axial direction between the top of the second protrusion and the end face of the front wheel support case, and distance between the top of the third protrusion and the end of the flange of the axle in the axial direction The paddy field operation machine according to claim 4, wherein the distance between the second convex portion and the third convex portion in the radial direction is set large.   The position between the top of the first convex portion and the end face of the flange of the axle is in the axial direction, rather than the position between the top of the third convex portion and the end face of the flange of the axle The paddy field work machine according to claim 5, which is located on the side away from the axle seal member. The first and second convex portions are arranged in the radial direction so that the first convex portion is positioned radially outward and the second convex portion is positioned radially inward.
A ring-shaped third convex portion that protrudes toward the end face of the front wheel support case and is close to the end face of the front wheel support case, and is positioned radially outward of the first convex portion. In the end face of the flange portion of the axle,
Distance in the axial direction between the top of the first projection and the end face of the flange of the axle, and in the axial direction between the top of the third projection and the end of the front wheel support case The paddy field operation machine according to claim 4, wherein a distance between the first convex portion and the third convex portion in the radial direction is set large. A right front axle supporting the right front axle case extending from the front of the aircraft to the right, and a left front wheel supporting the left front extending from the front of the aircraft to the left And a front axle case,
In the front and rear of the right front axle case, and in the front and rear of the left front axle case, through holes of the same diameter facing in the front-rear direction are formed,
Attach a closing member capable of closing and opening the through hole in the front through hole of the right and left front axle case, and apply a grease nipple to the through hole in the rear of the right and left front axle case The paddy field work machine according to any one of claims 1 to 7, to which is attached.

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