JP3930764B2 - Claw shaft sealing device for center drive type tiller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a claw shaft sealing device in a center drive type tiller.
[0002]
[Prior art]
In the center drive type cultivator, a transmission case is provided at the center of the left and right sides of the fuselage, and the main shaft is rotatably provided at the lower part of the transmission case. A claw shaft is connected, and a plurality of tilling claws are attached to the claw shaft.
The claw shaft is maintained in a connected state with the main shaft by restricting movement outward in the axial direction by the connecting member, and the connecting member includes a connecting rod disposed in the claw shaft. One end of the connecting rod is screwed to the outer end surface of the main shaft, and the other end of the connecting rod is provided with a closing body that contacts the outer end surface of the claw shaft, and the claw shaft is removed from the main shaft for maintenance or the like. In other words, it is only necessary to unscrew the main shaft and the connecting rod.
[0003]
[Problems to be solved by the invention]
In the conventional configuration, muddy water may enter the claw shaft from between the claw shaft and the closing body, from the coupling portion between the closing body and the connecting rod, or from between the main shaft and the claw shaft. When muddy water enters the claw shaft in this way, rust is generated at the coupling portion (screwed portion) between the connecting rod and the main shaft, the fitting portion between the main shaft and the claw shaft, etc., and the coupling member is detached from the main shaft. There is a problem that it becomes difficult to leave the door and the maintainability deteriorates.
In order to solve such a problem, the present invention prevents the intrusion of muddy water into the nail shaft by providing sealing means at both ends of the nail shaft, and prevents the nail shaft from being attached or detached. With the goal.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has taken the following technical means.
First, the main shaft 15 protruding from the transmission case 3, the cylindrical claw shaft 16 fitted and connected to the axial outer end portion of the main shaft 15, and the axial claw shaft 16 from the axial outer end side. A claw shaft mounting structure provided with a connecting member 37 that is inserted and fastened to the main shaft 15 to regulate the axial outward movement of the claw shaft 16.
A ring-shaped member 30 is fitted on the outer periphery of the main shaft 15 on the inner end side in the axial direction of the claw shaft 16, and a recess 16 a is formed on the inner end of the claw shaft 16. Seal members 49 and 50 are provided between the inner peripheral surface and the outer peripheral surface of the annular member 30, and between the inner peripheral surface of the annular member 30 and the outer peripheral surface of the main shaft 15, respectively.
A support tube 9 projecting from the transmission case 3 around the main shaft 15, a cylindrical inclined shaft 13 having an axis inclined with respect to the main shaft 15 and rotatably supported by the support tube 9, and the main shaft 15 , A gear 18 that rotates along the inclined shaft 13, a seal member 23 provided between the outer periphery of the boss portion of the gear 18 and the inclined shaft 13, and the axial outer ends of the main shaft 15 and the inclined shaft 13. A protective cover 29 that covers the outer surface of the seal member 23 by closing the space between the portions,
The inner peripheral base portion 29a of the protective cover 29 is attached to the outer peripheral portion of the ring-shaped member 30 between the outer peripheral side of the concave portion 16a of the claw shaft 16 and the inner peripheral portion 24 of the seal member 23. It is.
[0005]
Second, the circumferential grooves 30a and 30b in which the seal members 49 and 50 are provided are formed in the inner peripheral portion and the outer peripheral portion of the ring-shaped member 30.
In addition, the nail | claw axis | shaft sealing device of the center drive type tiller in this invention also has the following characteristics.
A spindle projecting from Den dynamic case, a tubular gripper shaft being and axially removably connected a rotatable together relative to the axially outer end portion of the main shaft, the axial inner end of the gripper shaft It is inserted through the cylinder and is detachably connected to the axial outer end of the main shaft, and the axial outer end abuts the axial outer end of the claw shaft to restrict the axial outward movement of the claw shaft. A sealing member is provided between the coupling member and the main shaft at both ends of the claw shaft and between the coupling member and prevents water from entering the claw shaft.
[0006]
Since the sealing means prevents water in the claw shaft, rust and the like are less likely to occur in the connecting portion between the main shaft and the connecting member and the connecting portion between the main shaft and the claw shaft, and the connecting member is detached from the main shaft. The claw shaft can be reliably detached.
In the above configuration, the ring-shaped member is fitted on the outer peripheral portion of the main shaft on the axial inner end side of the claw shaft, and the concave portion into which the ring-shaped member enters the axial inner end surface of the claw shaft is formed. It is preferable that a sealing member constituting the sealing means is provided between the outer peripheral surface of the main shaft and the outer peripheral surface of the main shaft and between the outer peripheral surface of the ring-shaped member and the inner peripheral surface of the claw shaft.
[0007]
With such a configuration, the axial inner end of the claw shaft can be suitably sealed.
The connecting member includes a closing body that is in contact with the outer end of the claw shaft in the axial direction, and a connecting rod that is penetrated in a state where one end is detachably coupled to the outer end of the main shaft and the other end is prevented from coming off by the closing body. It is preferable that a sealing member that constitutes the sealing means is provided between the connecting rod and the closing body so as to close the through portion of the connecting rod. Thereby, it is possible to suitably prevent water from entering between the closing body and the connecting rod into the claw shaft.
The connecting member includes a closing body that abuts the outer end surface of the claw shaft in the axial direction, and a connecting rod that is penetrated in a state where one end is detachably coupled to the outer end of the main shaft and the other end is prevented from coming off by the closing body. The closing body includes a peripheral wall portion fitted into the inner peripheral portion of the claw shaft, and a seal member constituting the sealing means is provided between the outer peripheral surface of the peripheral wall portion and the inner peripheral surface of the claw shaft. It is preferable. Thereby, it is possible to suitably prevent water from entering between the closing body and the claw shaft.
[0008]
When the outer periphery of the outer end of the main shaft and the inner periphery of the inner end of the claw shaft are key-coupled, seal members constituting the sealing means are provided on both sides of the key, and the seal member has a key groove. It is preferable that the convex part to enter is formed. As a result, the inner end of the claw shaft in the axial direction can be suitably sealed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 13 shows the outline of the center drive type tiller 1 as a whole. A vertical transmission case 3 is provided at the left and right center portion of the machine frame 2, and the tiller portions 4 are provided on the left and right sides of the lower part of the transmission case 3. The tillage part 4 is covered with a cover 5.
This cultivator 1 is directly mounted on a tractor (not shown) by a three-point link or the like so that the power from the PTO shaft of the tractor is input to the transmission case 3, and transmission means 6 ( It is the structure which drives the tillage part 4 via FIG. 1).
[0010]
As said transmission means 6, a winding transmission body, a bevel gear transmission body, etc. can be employ | adopted and the center drive type tiller 1 of this invention is not restricted to a tractor direct mounting type, A walk type may be sufficient.
In FIG. 1 showing the left and right halves of the tillage part 4, a tilling shaft 8 is rotatably supported around a horizontal axis center via a bearing 7 at the lower part of the transmission case 3. A support tube 9 is fixed around the tilling shaft 8. A number of tilling claws 11 are provided on the outer peripheral surface of the tilling shaft 8 via mounting brackets 10.
[0011]
A cylindrical inclined shaft 13 is rotatably supported on the outer peripheral portion of the support cylinder 9 via a bearing 12. The inclined shaft 13 has an axis that is inclined with respect to the axis of the tilling shaft 8 so that the outer side in the axial direction is slightly downward. Is attached.
The tillage shaft 8 has a main shaft 15 rotatably supported by the transmission case 3 and a claw shaft 16 connected to the outer side in the axial direction of the main shaft 15. Can be attached.
[0012]
In the cylinder of the tilt shaft 13, the bearing 12 is disposed, and further, interlocking mechanisms 18 and 19 for interlocking the tillage shaft 8 and the tilt shaft 13 are disposed on the outer side in the axial direction. This interlocking mechanism includes an inner gear 18 that is provided so as to be rotatable integrally with the main shaft 15 of the tilling shaft 8 by spline fitting or the like, and an outer gear 19 that is formed on the inner peripheral surface of the inclined shaft 13. By engaging 19, the tilling shaft 8 and the tilt shaft 13 are rotated together.
A seal member 20 is provided between the support tube 9 and the inclined shaft 13 on the inner side in the axial direction from the bearing 12, and a labyrinth passage 21 is formed on the outer peripheral portion of the inclined shaft 13 so that mud or the like enters. Is prevented.
[0013]
A seal member 23 is provided between the main shaft 15 and the inclined shaft 13 outside the bearing 12 in the axial direction, and the seal member 23 is located outside the axial direction of the inclined shaft 13 as shown in FIG. The outer peripheral part 25 fitted to the inner peripheral surface of the end part, the inner peripheral part 24 fitted to the outer periphery of the boss part of the inner gear 18, and the inner and outer double parts provided between the inner and outer peripheral parts 24, 25. The inner and outer peripheral parts 24 and 25 are provided with reinforcing members 27.
The inclined shaft 13 and the main shaft 15 are in an inclined relationship, and the interval between the two changes with rotation so as to be narrower on the upper side than the shaft center and wider on the lower side, and the seal member 23 so as to follow this. The inner and outer flexible portions 26 and 26 are extendable in the radial direction. Specifically, both of the inner and outer flexible portions 26 and 26 are radially outwardly convex 26a and radially inwardly concave. It has an uneven shape so as to be 26b.
[0014]
The outer surface of the seal member 23 is covered with a protective cover 29.
The protective cover 29 has an inner peripheral base portion 29a attached to the main shaft 15 (more specifically, an outer peripheral portion of the spacer 30 fitted to the outer peripheral portion of the main shaft 15), and an outer peripheral portion 29b having a diameter toward the inclined shaft 13 side. The front end portion (free end portion) is extended so as to spread outward in the direction, and is close to the outer peripheral surface of the outer end portion of the inclined shaft 13. With this structure, the seal member is closed between the inclined shaft 13 and the main shaft 15. The outer surface of 23 is protected from mud and the like.
[0015]
A protective ring 31 is provided in the protective cover 29 to cover the radially outer side of the seal member 23. The protective ring 31 is formed in a ring shape by metal or hard resin, and its radially outer portion is fitted and attached to a locking groove 27a of the reinforcing member 27 provided on the outer peripheral portion 25 of the seal member 23. The inside of the protective ring 31 in the radial direction is bent (bulged) outward in the axial direction of the inclined shaft 13 so as to approach the protective cover 29, and the protective cover 29 is formed by the bulged portion 31a. The gap between and is made smaller.
[0016]
As apparent from FIG. 2, the gap between the upper side of the tilling shaft 8 and the inclined shaft 13 is narrower than the lower side, and the space between the seal member 23 and the protective cover 29 is also narrowed. When mud or stone or the like enters from a gap between the outer end of the diameter 29 and the outer surface of the inclined shaft 13, the entered mud or the like may be pressed in a narrow space in the protective cover 29 and damage the seal member 23. Occurs. However, in the present embodiment, the seal member 23 is protected from mud or the like by providing the protective ring 31 that covers the outer surface of the seal member 23 in the radial direction, and in particular, the diameter of the seal member 23 (flexible portion 26). The outer portion in the direction becomes a convex 26a outward in the axial direction and is easily damaged by mud or the like. By actively covering this portion with the protective ring 31, damage to the seal member 23 is prevented. ing.
[0017]
Further, since the gap on the radially inner side of the protective ring 31 approaches the inner surface of the protective cover 29 and the gap is small, mud or the like passing through the gap is reduced, and the inside of the protective cover 29 (in particular, the diameter of the protective cover 29). Intrusion of mud in the direction inside) can be suppressed as much as possible.
For this reason, mud or the like is less likely to enter the portion that is radially inwardly recessed 26b inside the seal member 23, and stones or the like are less likely to bite into the recess 26b when the seal member 23 contracts. It has become.
[0018]
The protective cover 29 may be formed with a large number of small holes 33 penetrating inward and outward as shown in FIG. The small holes 33 are large enough to prevent passage of stones or the like of a certain size or more, and to discharge small stones or the like entering from between the protective cover 29 and the inclined shaft 13 to the outside of the protective cover 29. It is preferable to form it.
As shown in FIG. 1, the tilling shaft 8 includes a main shaft 15 and a claw shaft 16. The main shaft 15 is a solid shaft that is rotatably supported by the transmission case 3 via a bearing 7. The claw shaft 16 is a hollow shaft ( (Cylinder shaft) is fitted to the outer end of the main shaft 15.
[0019]
A key 35 is provided on the outer peripheral surface of the outer end portion of the main shaft 15. The key 35 engages with a key groove 36 formed on the inner peripheral surface of the claw shaft 16, and the claw shaft 16 rotates integrally with the main shaft 15. The claw shaft 16 is coupled to the outer side in a detachable manner, and the movement of the claw shaft 16 outward in the axial direction is restricted by the connecting member 37.
The connecting member 37 is inserted into the claw shaft 16 and provided at one end of the connecting rod 38 that is screwed into a female screw portion 15 a formed on the outer end surface of the main shaft 15 and the other end of the connecting rod 38. And a closing body 39 that contacts the outer end surface of the claw shaft 16 and closes the opening.
[0020]
As shown in FIG. 3, the closing body 39 is formed in a size that fits the cylindrical inner diameter of the claw shaft 16 and is arranged in the claw shaft 16, and from the outer periphery of the inner wall portion 40 in the axial direction. A peripheral wall portion 41 that is bent outward and is fitted into the claw shaft 16, and a flange portion 42 that is bent radially at the outer end portion of the peripheral wall portion 41 and abuts against the end surface of the claw shaft 16. The connecting rod 38 is passed through a through hole 40a formed in the center of the inner wall 40, and the nut 43 is screwed onto the connecting rod 38 outside the inner wall 40, so that the axial direction of the closing body 39 with respect to the connecting rod 38 is achieved. The nut 43 is secured to the connecting rod 38 by welding 44 on the outer surface side.
[0021]
A circumferential groove 41a is formed on the outer peripheral surface of the peripheral wall portion 41, and a sealing member 46 made of an O-ring that seals between the inner peripheral surface of the claw shaft 16 is provided in the peripheral groove 41a.
Further, in the claw shaft 16, a connecting portion between the inner wall portion 40 and the connecting rod 38 (through portion of the connecting rod 38) is joined by welding 47, and the connecting rod 38 and the closing body 39 are integrated.
Therefore, even if muddy water or the like enters the gap between the closing body 39 and the claw shaft 16 as indicated by arrow A, the seal member 46 between the peripheral wall portion 41 and the claw shaft 16 prevents water from entering the claw shaft 16. The welded portion 47 functions as a sealing member between the connecting rod 38 and the inner wall portion 40 to prevent the intrusion of muddy water or the like as indicated by arrow B. Here, the sealing members 46 and 47 constitute a sealing means 74 that prevents the outer end portion of the claw shaft 16 in the axial direction from being submerged.
[0022]
As shown in FIG. 2, the spacer (ring-shaped member) 30 is fitted on the outer peripheral portion of the main shaft 15 on the inner end side in the axial direction of the claw shaft 16. A groove 30a is formed, and a sealing member 49 made of an O-ring is provided in the circumferential groove 30a, and intrusion of muddy water or the like between the spacer 30 and the main shaft 15 is prevented. A recess 16a is formed on the inner periphery of the inner end of the claw shaft 16 in the axial direction, and the outer end of the spacer 30 enters the recess 16a. The outer periphery of the spacer 30 is inserted into the recess 16a. A circumferential groove 30b is formed and a seal member 50 made of an O-ring is provided to prevent water from entering between the spacer 30 and the claw shaft 16. Here, the sealing members 49 and 50 constitute a sealing means 75 at the axially inner end portion of the claw shaft 16.
[0023]
Therefore, both of the sealing members 46 and 47 at the outer end portion in the axial direction of the claw shaft 16 and the sealing members 49 and 50 at the inner end portion in the axial direction ensure that muddy water or the like enters the claw shaft 16. It is prevented that rust or the like is generated at the connecting portion (screwing portion) between the connecting rod 38 and the main shaft 15 or the fitting portion between the main shaft 15 and the claw shaft 16, and the connecting member 37 for the main shaft 15 is prevented. In addition, the attachment / detachment of the claw shaft 16 is hardly hindered due to the occurrence of rust or the like.
FIG. 5 shows another embodiment of the seal protection device for the inclined shaft 13.
[0024]
In this embodiment, the entire flexible portion 26 of the seal member 23 is formed as a concave 26 b inward in the axial direction between the inner peripheral portion 24 and the outer peripheral portion 25, and therefore mud that has entered the protective cover 29. The damage to the flexible part 26 is prevented as much as possible. The protective ring 31 is formed in a substantially flat ring shape.
FIG. 6 shows another embodiment of the seal protection device for the inclined shaft 13.
In this embodiment, the protective ring 31 is made of a flexible elastic material such as rubber or sponge, the inner peripheral side is in contact with the outer surface of the convex portion 26 a of the seal member 23, and the outer peripheral side is in contact with the inner surface of the protective cover 29. Yes.
[0025]
Further, the protective ring 31 is formed in a tapered shape on the inner peripheral side substantially along the shape of the convex portion 26a on the outer surface of the seal member 23, and is fixed to the reinforcing member 27 and the like of the outer peripheral portion 25 of the seal member.
In the present embodiment, the space between the protective cover 29 and the seal member 23 is closed without a gap by the protective ring 31, and the protection of the seal member 23 is increased by reliably preventing the entry of mud and the like, Since the protective ring 31 is formed of an elastic material, it can follow the expansion and contraction movement of the seal member 23.
[0026]
FIG. 7 shows another embodiment of the seal protection device for the inclined shaft 13, and the protective cover 29 of this embodiment is formed by a flexible cylindrical member such as urethane rubber, and its axial direction. The inner end of the protective cover 29 is fixed to a circumferential locking groove 51 formed on the outer periphery of the axial outer end of the inclined shaft 13 via a retaining ring 52, and the axial outer end of the protective cover 29 is fixed to the main shaft 15. Is fixed to a circumferential locking groove 53 formed in the spacer 30 via a retaining ring 54.
Since this protective cover 29 completely closes the space between the main shaft 15 and the inclined shaft 13, no intrusion of mud or the like from there occurs, so that the seal member 23 can be reliably protected, and flexibility is improved. Therefore, it is possible to suitably follow a change in the gap between the inclined shaft 13 and the main shaft 15.
[0027]
FIG. 8 shows another embodiment of the seal protection device for the inclined shaft 13, and a second protective cover 57 is further provided to the configuration of the previous embodiment.
The second protective cover 57 has substantially the same shape as that of the first embodiment, but the outer peripheral portion 57b is separated from the outer peripheral surface of the axial outer end portion of the inclined shaft 13 radially outward. The protective cover 29 is protected from wrapping of mud or grass.
[0028]
Further, the outer end portion in the axial direction of the protective cover 29 is fixed to a locking groove 53 formed in the inner peripheral base portion 57 a of the second protective cover 57 by a retaining ring 54.
Figure 9 shows the sealing structure of the gripper shaft 16 the outer end portion, made of rubber material or the like of the cylindrical the connecting portion of the inner wall portion 40 and the connecting rod 38 of the closure member 39 (through hole 40a) seal A member 59 is provided, and a seal member 60 made of a cylindrical rubber material or the like is also provided between the outer peripheral surface of the peripheral wall portion 41 and the inner peripheral surface of the claw shaft 16. 16 and the gap between the closing body 39 and the gap between the closing body 39 and the connecting rod 38 are blocked to prevent entry of muddy water or the like.
[0029]
FIG. 10 shows a reference embodiment of the seal structure of the inner end portion of the claw shaft 16, in which seal members 62 are provided on both sides in the axial direction of the key 35 between the claw shaft 16 and the main shaft 15. The seal member 62 is provided in the circumferential groove 63 formed on the outer peripheral portion of the main shaft 15, and the convex portion 62a to be fitted into the key groove 36 is integrally formed on the seal member 62 as shown in FIG. It has become.
Thus, by providing the seal members 62 on both sides in the axial direction of the key 35, that is, on both sides in the axial direction of the fitting portion between the main shaft 15 and the claw shaft 16, water leakage, rust, etc. are generated in the fitting portion. Thus, the detachment of the claw shaft 16 from the main shaft 15 is not hindered by rust or the like.
[0030]
In the above configuration, a lubricant such as grease may be enclosed between the seal members 62, 62. In this case, as indicated by a two-dot chain line, a grease nipple 64 is provided on the outer periphery of the claw shaft 16. It is preferable that the main shaft 15 or the claw shaft 16 is formed with a spiral groove 65 for spreading grease over the entire axial direction of the fitting portion.
In this case, the axially inner seal member 62 prevents both intrusion of muddy water and the like from between the inner end portion of the claw shaft 16 and the main shaft 15 and leakage of grease from the fitting portion.
[0031]
11 and 12, a pair of brackets 70 project from the axially inner end of the tilling shaft 8 (claw shaft 16) at a position shifted by 180 °, and a protective cover is provided for the pair of brackets 70. The protective cover 29 has a two-part structure, and is detachably attached to the brackets 70 and 70 by fasteners 71 such as bolts and nuts.
Each of the divided bodies 72, 72 of the protective cover 29 has a substantially semicircular standing wall portion 72a and a peripheral wall portion 72b that bends from the outer peripheral end of the standing wall portion 72a toward the seal member 23, and the peripheral wall portion 72b is a concave portion. It is divided into a plurality of circumferential directions via 72c.
[0032]
At both ends of the standing wall portion 72a, mounting base portions 72d that are bent toward the anti-seal member 23 are formed, and the mounting base portion 72d is fixed by a fastener 71 that faces the bracket 70.
Since the protective cover 29 has a two-part structure as described above, the protective cover 29 can be easily attached to and detached from the claw shaft 16 without detaching the claw shaft 16 from the main shaft 15.
The present invention is not limited to the embodiment described above, and can be appropriately changed in design.
[0033]
【The invention's effect】
As described above in detail, according to the present invention, a ring-shaped member is provided on the inner end side in the axial direction of the claw shaft, and a seal member and a protective cover are provided via the ring-shaped member. preventing entry of muddy water into the inner can be made to interfere with the attachment and detachment of the nail shaft is not caused, also, Ru can be easily attached to the sealing member and the protective cover.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a tillage unit according to an embodiment of the present invention.
FIG. 2 is an enlarged sectional view of an inclined axis and a tilling axis.
FIG. 3 is an enlarged cross-sectional view of the outer end portion of the tilling shaft.
FIG. 4 is a side view showing a protective cover according to another embodiment.
FIG. 5 is an enlarged cross-sectional view of an inclination axis and a tilling axis according to another embodiment.
FIG. 6 is an enlarged cross-sectional view of an inclined shaft and a tilling shaft according to another embodiment.
FIG. 7 is an enlarged cross-sectional view of an inclination axis and a tilling axis according to another embodiment.
FIG. 8 is an enlarged cross-sectional view of an inclination axis and a tilling axis according to another embodiment.
9 is an enlarged sectional view of a hydroponic耘軸outer end.
10A is an enlarged cross-sectional view of an inclined shaft and a tilling shaft according to a reference embodiment, and FIG. 10B is a side view of a sealing member.
FIG. 11 is an enlarged cross-sectional view showing a modified example of the protective cover .
FIG. 12 is a side view of the protective cover.
FIG. 13 is a schematic overall view of a field cultivator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cultivator 3 Transmission case 8 Cultivation shaft 15 Main shaft 16 Claw shaft 16a Concave portion 30 Spacer (ring-shaped member))
37 connecting member 38 connecting rod 39 closing body 41 peripheral wall portion 46 seal member 47 welded portion (seal member)
49 seal member 50 seal member 59 seal member 60 seal member 62 seal member 62a convex portion

Claims (2)

A main shaft (15) protruding from the transmission case (3), a cylindrical claw shaft (16) fitted and connected to the outer end of the main shaft (15) in the axial direction, and the claw shaft (16) A claw shaft mounting structure provided with a connecting member (37) that is inserted from the axial outer end side and fastened to the main shaft (15) to restrict the axial movement of the claw shaft (16).
A ring-shaped member (30) is fitted on the outer periphery of the main shaft (15) on the inner end side in the axial direction of the claw shaft (16), and is fitted on the ring-shaped member (30) on the inner end of the claw shaft (16). A recess (16a) is formed, and between the inner peripheral surface of the recess (16a) and the outer peripheral surface of the annular member (30), and between the inner peripheral surface of the annular member (30) and the outer peripheral surface of the main shaft (15). Seal members (49, 50) are provided between them,
A support cylinder (9) projecting from the transmission case (3) around the main shaft (15) and an axis inclined with respect to the main shaft (15) are rotatably supported by the support cylinder (9). A cylindrical tilt shaft (13), a gear (18) provided on the main shaft (15) and rotating along the tilt shaft (13), an outer periphery of the boss portion of the gear (18), and the tilt shaft (13) And a protective cover (29) covering the outer surface of the seal member (23) by closing the space between the seal member (23) provided between the main shaft (15) and the axially outer end of the main shaft (15) and the inclined shaft (13). And,
The inner periphery of the protective cover (29) is disposed on the outer peripheral portion of the annular member (30) between the outer peripheral side of the recess (16a) of the claw shaft (16) and the inner peripheral portion (24) of the seal member (23). A claw shaft sealing device for a center drive type tiller, characterized in that a base (29a) is attached .   The center drive type tillage according to claim 1, characterized in that circumferential grooves (30a, 30b) for providing the seal members (49, 50) are formed in an inner peripheral portion and an outer peripheral portion of the annular member (30). Machine claw shaft sealing device.

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