JP3266800B2 - Side drive rotary extension shaft mounting structure and jaw shaft bearing case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side drive rotary mounted on a vehicle such as a tractor, and more particularly, to an extended shaft mounting structure connected to an outer end portion of a main pawl shaft. The present invention relates to a bearing case suitable for use.

[0002]

2. Description of the Related Art A conventional side drive rotary of this type is disclosed, for example, in Japanese Utility Model Publication No. 44-9445. In this conventional side drive rotary, a support shaft provided at an outer end of a main claw shaft to which a large number of tilling claws are attached is rotatably supported by a bearing disposed in a bearing case. A joint member is connected to the support shaft from the outer end side, and an extension shaft is detachably attached to the joint member.

[0003] The bearing case is formed in a single cylindrical shape, and the bearing disposed at the center of the shaft rotatably supports the support shaft of the main claw shaft.

[0004]

However, when the cultivation width of the main shaft is insufficient, the extension shaft may be used to increase the cultivation width or to attach various special work attachments to the side of the rotary. This is a special type used when farming, and may not be necessary for ordinary farmers. Even when such an extension shaft is not required, mounting a joint member for attaching the extension shaft in advance leads to an increase in overall cost.

Further, the joint member rotates together with the main claw shaft, but it is necessary to provide a seal device for protecting the bearing from mud between the rotating joint member and the fixed bearing case. As a result, such a sealing device is easily damaged at an early stage. That is, according to the above-described conventional technology, there is a problem that the durability of the sealing device is deteriorated because the joint member is always attached even when the extension shaft is unnecessary.

Therefore, the present invention can be used for both the case where an extension shaft is required and the case where it is not necessary, and can secure the sealing performance for a long time when the extension shaft is not required, and furthermore, the extension can be performed temporarily. It is an object of the present invention to provide an extended shaft mounting structure capable of securing the sealing performance while speeding up the attaching and detaching replacement work when the shaft is removed. Another object is to provide a bearing case suitable for use in this structure.

[0007]

According to the present invention, a support shaft provided at the outer end of a main claw shaft to which a number of tillage claws are attached is rotatably supported by a bearing disposed in a bearing case. The bearing case is provided with the bearing therein.
Having a small-diameter cylindrical portion and a large-diameter cylindrical portion outside the small-diameter cylindrical portion,
An extension shaft mounting structure for a side drive rotary, wherein a coupling member is detachably connected to the support shaft portion from an outer end side, and an extension shaft is detachably attached to the coupling member. In order to achieve the above objectives, the following technical measures were taken.

First, the cover mounting portion for mounting a cover for covering the bearing from the outside when the joint member is removed is provided with the small- sized cover mounting portion.
The large-diameter tube portion is provided on the
I'm covering . Then, when the extension shaft is unnecessary, the bearing can be protected from mud by removing the joint member and attaching the cover to the bearing case. As described above, since the cover for securing the sealing performance is attached to the bearing case on the fixed side, there is no direct influence due to the rotation of the main pawl shaft, and the sealing performance when the extension shaft is unnecessary is required. Can be secured over a long period. Also, usually by selling with the joint member removed,
The overall cost can be reduced, and a joint member is separately provided and attached only when an extension shaft is required, so that both users who need the extension shaft and users who do not need it can be accommodated.

Second, a flange portion is provided at an end of the joint member.
The extension shaft is detachably fixed to the flange portion.
The large-diameter cylindrical portion is provided with an outer cover attaching portion for attaching an outer cover for covering the flange portion from outside when the extension shaft is removed from the flange portion . In addition,
The flange portion has an outer end of the small-diameter cylindrical portion and an outer end of the large-diameter cylindrical portion.
Arranged between Then, when it is desired to temporarily remove the extension shaft during tillage work using the extension shaft, for example, with the joint member attached, remove the extension shaft from the joint member, and cover the joint member. Attach the outer cover to the bearing case. In this way, the extension shaft can be attached and detached only by performing a simple operation, and the bearing can be protected from mud by the outer cover that is not directly affected by the rotation of the main claw shaft.

Third, an inner cover mounting portion for mounting an inner cover that covers the bearing from outside when the joint member is removed,
An outer cover mounting portion for mounting an outer cover that covers the inner cover from the outside; Then, when the extension shaft is unnecessary, the bearing can be reliably protected from mud by a double seal by removing the joint member and attaching the inner cover and the outer cover to the bearing case. As described above, since the cover for securing the sealing performance is attached to the bearing case on the fixed side, there is no direct influence due to the rotation of the main pawl shaft, and the sealing performance when the extension shaft is unnecessary is required. Can be secured over a long period. In addition, it is possible to reduce the overall cost by selling the product with the joint member removed, and to provide the joint member separately and attach it only when the extension shaft is needed, so that the extension shaft is required. And users who do not need it.

The above-mentioned bearing case rotatably supports the main claw shaft whose extension shaft is connected to the outer end portion, and may have various configurations. As a preferable configuration of the bearing case, the bearing case includes a small-diameter cylindrical portion on the shaft center side and a large-diameter cylindrical portion on the outer end side of the small-diameter cylindrical portion. A bearing for rotatably supporting a support shaft provided in the portion is provided, and a joint member for connecting an extension shaft to an outer end side of the bearing is configured to be attached to the support shaft. The small-diameter cylindrical portion extends outwardly of the shaft from the outer end of the support shaft portion supported by the shaft, and the outer end of the large-diameter cylindrical portion is more off-axis than the outer end of the small-diameter cylindrical portion. It shall be extended to one side.

When the inner cover is fitted to the outer end of the small-diameter tube and the outer cover is fitted to the outer end of the large-diameter tube, the joint member for connecting the extension shaft is not mounted. , A double seal can be obtained, and the overall configuration can be made compact and simple. When the extension shaft is used, the inner cover and the outer cover are removed, and the joint member for attaching the extension shaft may be connected to the shaft support portion of the main claw shaft.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 4, reference numeral 10 denotes a transmission case which constitutes a rear portion of the body of the tractor. A hydraulic device 12 for lifting and lowering a working machine having a pair of left and right lift arms 11 is provided on the rear portion thereof. 13 is projected. A three-point lifting link 14 is provided at the rear of the transmission case 10. The front end of the three-point lifting link 14 at the front end of a top link 15 is pivotally connected to a bracket 16 fixed to the transmission case 10. The front ends of the left and right lower links 17 are pivotally connected to the left and right sides of the rear part of the transmission case 10, and the middle of the lower links 17 in the front-rear direction is connected to the left and right lift arms 11 via lift rods 18.

At the rear end of the three-point lifting link 14, a connection frame 19 having a substantially A-shape in front view is provided, and a rotary 20 is detachably connected via the connection frame 19. The rotary 20 is of a side drive type. As shown in FIG. 5, a support arm 22 projects from a gear case 21 on both left and right sides, and a chain case 23 is provided at an outer end of the left support arm 22, and a right support arm 22 is provided. A rotary machine frame 25 is provided at the outer end of the arm 22 with side frames 24 attached and fixed.

A bearing case 26 (see FIG. 4) provided below the chain case 23 and a bearing case 27 provided below the side frame 24 as shown in FIG. And a main claw shaft 28 rotatably supported about a left-right axis.
And a rotary tilling part 30 mainly composed of a large number of tilling claws 29 attached to the knives. The rotary machine frame 25 is provided with a rotary cover 31 that covers the rotary tilling unit 30.

An input shaft 32 protrudes forward from the gear case 21, and the input shaft 32 is connected to the PTO shaft 13 via a power transmission shaft 33. The rotational power given to the input shaft 32 is
A transmission shaft (not shown) disposed in the inside, a chain case 23
It is configured to be transmitted to the main claw shaft 28 via a transmission chain (not shown) disposed therein.

At the right outer end of the main claw shaft 28, an extension claw shaft for expanding the tillage width and an extension shaft 35 used as a power take-out shaft for various attachments such as a ridge forming machine are provided. , And can be detachably connected via a joint member 34. The details of the mounting structure of the extension shaft 35 will be described below. FIG. 1 shows a state in which the joint member 34 and the extension shaft 35 are mounted, and FIG. 2 shows a state in which the extension shaft 35 is removed from the joint member connected to the outer end of the main claw shaft 34. Shows a state in which both the joint member 34 and the extension shaft 35 have been removed.

First, the mounting structure of the extension shaft 35 will be described with reference to FIG. 1. The bearing case 27 provided at the lower end of the side frame 24 is formed in a substantially cylindrical shape, and has a small-diameter cylinder on the shaft center side. It has a portion 37 and a large-diameter cylindrical portion 38 on the outer end side of the small-diameter cylindrical portion 37. In the small-diameter cylindrical portion 37, a bearing 40 for rotatably supporting a support shaft portion 39 provided at an outer end portion of the main claw shaft 28 is provided. The support shaft 39
It has a cylindrical boss portion 39a and a flange portion 39b provided at the inner end of the boss portion 39a. The boss portion 39a is rotatably supported by the bearing 40, and the flange portion 39b is mainly provided. Flange 2 provided on outer end of claw shaft 28
8a is attached and fixed by bolts 41 or the like. In addition,
The outer periphery of the flange portion 39b of the support shaft portion 39 is covered by the inner end portion of the shaft of the bearing case 27, and the mud is removed.
From flowing into the inside from the inside opening.
Further, a sealing device 42 is interposed between the boss portion 39a and the small-diameter cylindrical portion 37 inside the shaft with respect to the bearing 40 to ensure reliable sealing.

The inner surface of the boss portion 39a of the support shaft portion 39 is splined, and the joint member 34 is attached to the boss portion 39a.
Are detachably mounted and fixed from the outer end side. That is, the joint member 34 has a shaft portion 34a that is spline-fitted into the boss portion 39a of the support shaft portion 39, and a flange portion 34b that is welded and fixed to an outer end of the shaft portion 34a. A bolt insertion hole 36 is provided in the center of the bolt 34a.
The support shaft portion 39 and the joint member 34 are attached and fixed so as to rotate integrally by being fastened to a nut member 44 fitted to the inner end side of 9b.

The small-diameter cylindrical portion 37 extends outwardly from the outer end of the support shaft portion 39 (in this embodiment, the outer end of the boss portion 39a). Shaft 34
A sealing device 45 located outside of the bearing 40 is interposed between the base device and the base end of the bearing a, and protects the bearing 40 from mud flowing from the outer opening of the bearing case 27. The sealing device 45 is detachable and replaceable. When the joint member 35 is removed, the sealing device 45 is also removed at the same time.

The outer end of the large-diameter cylindrical portion 38 extends outwardly of the shaft from the outer end of the small-diameter cylindrical portion 37, and the extended portion connects the flange portion 34b of the joint member 34. Covered from outside in the circumferential direction. That is, the flange portion 34 b of the joint member 34 is connected to the outer end of the small-diameter cylindrical portion 37 and the large-diameter cylindrical portion 38.
The flange 34b covers the outside opening of the small-diameter cylindrical portion 37 from outside the axis. Therefore, most of the mud can be shut off by the flange portion 34b, and the flange portion 34b is covered from outside by the large-diameter cylindrical portion 38, so that the flange portion 34b
The intrusion of mud through the gap between the inner diameter and the large-diameter cylindrical portion 38 can be suppressed as small as possible.

A flange 35a provided at the inner end of the extension shaft 35 is detachably attached and fixed to the flange 34b of the joint member 34 by bolts 46. In addition,
The extension shaft 35 shown in FIG. 1 is an extension claw shaft to which a plurality of tilling claws 29 are attached. As described above, when the extension claw shaft is attached, the tilling width can be increased, and the efficiency of the tilling operation can be improved.

When the extension shaft 35 becomes unnecessary, the extension shaft 35 shown in FIG.
With the joint member 34 attached as shown in FIG.
Only the joint member 3 as shown in FIG.
4 and the extension shaft 35 can be removed. When the extension shaft 35 is not used for a long time, it is preferable to remove both the joint member 34 and the extension shaft 35 as shown in FIG. It is preferable to remove only the extension shaft 35 as shown in FIG. 2 when the extension shaft 35 is detached relatively frequently.

As shown in FIG. 2, when the extension shaft 35 is removed from the joint member 34 connected to the support shaft portion 39, the outer cover 47 is fitted to the large-diameter cylindrical portion 38 of the bearing case 27 from the outer end side. The bearing case 2 is
7 is removably fixed to 7. That is, in the present embodiment, the outer end of the large-diameter cylindrical portion 38 serves as an outer cover mounting portion 49 for mounting the outer cover 47.

The outer cover 47 closes the outer opening of the bearing case 27 and covers the joint member 34, the bearing 40, the sealing device 45, and the like in the bearing case 27 from the outside, so that muddy soil can enter these components. It is to prevent. FIG.
As shown in the figure, when the extension shaft 35 is not used for a long time,
If the extension shaft 35 is not required, the extension shaft 3
5, the joint member 34 is removed from the support shaft 39, the above-described outer cover 47 is mounted, and the inner cover 52 is fitted into the outer opening of the small-diameter cylindrical portion 37. As described above, in the present embodiment, the outer end portion of the small-diameter cylindrical portion 37 serves as an inner cover mounting portion 54 for mounting the inner cover 52.

The inner cover 52 closes the outer opening of the small-diameter cylindrical portion 37 to prevent intrusion of mud from outside and protect the bearing 40 from mud. Further, since the inner cover 52 is further covered from the outside by the outer cover 47, the double cover surely prevents muddy soil from entering the bearing case 27 from the outside.

Since the covers 47 and 52 are mounted on the fixed bearing case 27 and are not directly affected by the rotation of the main pawl shaft 28, the sealing performance of the covers 47 and 52 can be ensured for a long period of time. . It is desirable that the side drive rotary 20 described above is not fitted with the joint member 34 (see FIG. 3) at the time of manufacture and sale to a general user, so that the extension shaft 35 becomes unnecessary. Also in this case, it is possible to avoid a situation in which the joint member 34 is mounted, and to reduce the overall cost. In addition, the sealing performance when the extension shaft 35 is unnecessary can be improved, and the extension shaft 35 can be quickly and easily attached as described above. By selling the member 34 as an option, it is possible to cope with a user who needs the extension shaft 35.

The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, the support shaft 3
9 can be formed integrally with the outer end of the main claw shaft 28. In the above embodiment, the support shaft 39 and the joint member 3
4 is spline-coupled, but, for example, the inner surface of the support shaft portion 39 may be a hexagonal surface, and the joint member 34 may be a hexagonal shaft, and these may be removably connected.

Hereinafter, the configuration of other parts of the rotary 20 will be described. The rotary cover 31 includes a main cover 60 that covers the upper part of the tilling unit 30, a rear cover 61 that is pivotally connected to a rear end of the main cover 60 so as to be rotatable around a left-right and right-left axis. The main part is composed of a pair of left and right side covers 62 that cover the rear upper portions of the right and left sides of the part 30.

As shown in FIGS. 4 and 5, the side cover 62 is rotatably mounted around a vertical axis via a pair of upper and lower hinges 63, and its rear end can swing inward. Is configured. The axis of the hinge 63 is inclined forward as it moves upward, so that when it swings inward, the rear end of the side cover 62 moves slightly downward.

When the side cover 62 is pivoted inward, the rear cover 61 is pivoted upward, and the pivoted side cover 62 is positioned below the rear cover 61. . A positioning pin 64 for positioning the side cover 62 in the inner swing posture is held on the rear cover 61 so as to be able to protrude and retract downward, and the pin 64 is moved downward by urging means (not shown) such as a coil spring. Has been energized.

On the other hand, on the outer surface of the side cover 62, there is provided a cylindrical portion 65 through which the positioning pins 64 are inserted so as to be freely inserted and removed. When the side cover 62 is swung inward, the rear cover 61 is moved. When the positioning pin 64 is lifted up by hand, the side cover 62 is swung inward, and the pin 64 is inserted into a cylindrical portion 65 provided on the side surface of the side cover 62.
Is inserted, the side cover 62 can be positioned in the inward swinging posture.

A fixing means 66 for holding the side cover 62 in a normal posture (parallel posture) is detachably provided at the upper and lower centers of the front end of the side cover 62. When the side cover 62 is in a normal posture shown by a two-dot chain line in FIG. 5, a large number of tilling claws 29 of the main claw shaft 28 are arranged so as to be tilled evenly as shown in FIG.

Then, when performing the inner cultivation cultivation (one cultivation cultivation), the side cover 62 can be used without changing the nail arrangement.
Is supported such that the rear end side is inclined inward as described above. As a result, even if the tilling claws 29 remain in the uniform tilling arrangement, as shown in FIG. 7, the soil is brought inward by the inclined side cover 62, so that the inside tilling can be performed. . Therefore, it is not necessary to attach and detach a large number of tilling claws, and the operation can be speeded up and facilitated.

Next, the stand device 70 of the rotary 20 will be described with reference to FIGS. A stand device 70 for supporting the rotary 20 in an upright position when the rotary 20 is removed from the tractor is mounted on the rotary machine frame 25 of the rotary 20. The conventional stand device is configured separately from the rotary 20 and is inconvenient to carry around. Also, it has been common practice to store the rotary 20 in a lying state without using a stand device. However, it is necessary to raise the rotary 20 at the time of mounting work on a tractor, and a separate stand device is required. Become. The illustrated stand device 70 can solve the above-mentioned conventional problems by mounting the stand device on the rotary 20, simplify the structure, and facilitate the work of changing the storage state to the use state.
It can speed up.

The stand device 70 includes the chain case 2
3 is provided at the front end of the mounting side plate 72 of the rotary cover 31 which is mounted and fixed to the inner surface with bolts 71 and the like, and has a support bracket 74 mounted and fixed to the outer surface of the side plate 72 with bolts 73. Support bracket 74
Has a side piece 74a bolted to the side plate 72 and a support piece 74b extending left and right outward from the lower end of the side piece 74a. The support piece 74b has a long bar-shaped stand member 76. The vertical through-hole 7 through which is inserted so as to be movable in the axial direction.
7 are provided.

The stand member 76 is configured such that the middle part in the vertical direction is slightly bent in a substantially rectangular shape when viewed from the side, and the lower end side is inclined forward. Although the cross-sectional shapes of the through hole 77 and the stand member 76 are circular in the illustrated example, the through hole 7 and the stand member 76 do not rotate.
The cross-sectional shapes of the 7 and the stand member 76 can be elliptical or square.

At the lower end of the stand member 76, a curved ground plate 78 is fixed by welding. A retaining pin 79 is attached to the upper end of the stand member 76 so that the stand member 76
7 is prevented from falling downward. Also, in the vicinity of the lower end of the stand member 76, as shown in FIG. 7, a storage pin mounting hole for inserting a holding pin (β pin) 80 for holding the stand member 76 in a storage position in which it is lifted upward. 81 are provided. On the other hand, the stand member 76
The holding pin 80 is inserted slightly below the position where the retaining pin 79 is provided in order to hold the stand member 76 in the use posture in which the stand member 76 is pulled downward as shown in FIG. In use, a pin mounting hole 82 is provided. The distance between the pin mounting hole 82 and the holding pin 80 is equal to or slightly larger than the thickness of the support piece 74b of the support bracket 74.

Further, at the lower end of the stand member 76,
A coil spring 83 is fitted around the coil spring 83, and the coil spring 83 is prevented from falling down by a grounding plate 78.
The storage pin mounting hole 81 described above is provided. The diameter of the through hole 77 is smaller than the diameter of the coil spring 83. When the stand member 76 is lifted, the coil spring 83 is compressed between the support piece 74b and the ground plate 78, and The stand 83 is configured to urge the stand 76 downward by the spring 83.

In the stand device 70, the rotary 2
4 and 9, when the stand member 76 is in the storage position in which the stand member 76 is lifted upward, the storage pin mounting hole 81 is set higher than the support piece 74b.
Is positioned upward, and the holding pin 80 is mounted in the mounting hole 81. In this stored state, the holding pin 80 attached to the stand member 76 and the support bracket 74 prevent the stand 76 from falling downward, and the spring 83 urges the stand member 76 downward. Therefore, rattling of the stand member 76 during operation of the tractor can be prevented with a simple configuration. As shown in FIG. 9C, the holding pin 80 is formed to be larger than the front-rear width of the support bracket 74, and the rotation of the stand member 76 is determined by the holding pin 80 and the side of the support bracket 74. It is regulated by engagement with the piece 74a.

At the time of the work of attaching and detaching the rotary 20 from the tractor, when the holding pin 80 is pulled out from the pin mounting hole 81 during storage, the weight of the stand member 76 and the spring 8
With the urging force of No. 3, the stand member 76 is inevitably pulled downward, and when pulled out to the use position, the stand-off member 79 prevents the stand member 76 from falling further downward. Then, the holding pin 80 is inserted through the in-use pin mounting hole 82 located below the support piece 74b, and the support piece 74b is sandwiched between the holding pin 80 and the retaining pin 79, so that the stand The member 76 is held in the use posture.

The stand member 76 in this use posture has a lower end side inclined forward.
6 prevents the rotary 20 in the upright state from falling forward. As shown by a two-dot chain line in FIG. 9A, the outer end of the support piece 74b of the support bracket 74 is
A restricting piece 74c extending downward is provided, and the rotation of the stand member 76 can be restricted by engaging the holding pin 80 mounted in the pin mounting hole 82 with the restricting piece 74c during use.

Note that, as shown in FIG.
A gauge wheel 89 is attached to the rear of 5, and the rotary 20 is prevented from falling backward by the gauge wheel 89. According to the stand device 70 described above, since it has a simple configuration, it can be easily attached to the rotary machine frame 25, and the operation of changing the use posture and the storage posture can be performed easily and quickly.

FIGS. 10 and 11 show the side frame 24.
2 shows an inward fixed residual tillage processing claw 90 attached and fixed to the left side of FIG. The fixed residual tillage processing claw 90 is mounted and fixed to a claw mounting bracket 91 with a bolt 92 or the like. A mounting plate 93 is fixed to the bracket 91 by welding.
Is fixed by a bolt 95 to a mounting stay 94 provided at a lower portion on the front side of the side frame 24. The tip of the fixed residual tillage processing claw 90 is curved inward.

By attaching the fixed residual tillage processing claw 90 in this way, the residual tillage below the side frame side end bearing case 27 when the extension claw shaft 35 is set on the side frame 24 side of the side drive rotary 20 can be reduced. By preventing this, it is possible to carry out the residual tillage processing of the space at the connection portion between the main claw shaft 28 and the extension claw shaft 35, and also possible to reverse the rice plant, the weeds and the like. In addition, foreign matter such as weeds and straw attached to the front side of the fixed residual tillage processing nail 90 can be stroked off by the inward tillage nail 29 attached to the extension nail shaft 35.

FIGS. 12 and 13 show a state in which an outward fixing claw 96 is mounted on the claw mounting bracket 91 described above. The fixed claw 96 has a distal end bent outward, and the distal end protrudes laterally outward by about 6 cm from the outer end of the side frame 24. This fixed claw 9
As shown in FIG. 13, when the side drive rotary 20 is used to perform the tilling on the ridge, the weeds on the ridge can be dug back. In particular, even when a high wall 97 made of concrete or the like exists on the ridge, the ridge can be dug without making the side surface of the rotary 20 contact the wall 97.

[0047]

According to the present invention, the following specific effects can be obtained. That is, the present invention provides a cover mounting portion for mounting a cover for covering the bearing from the outside when the joint member is removed, and a cover for protecting the bearing from mud when an extension shaft is unnecessary. Is attached to the fixed-side bearing case, so that this cover is not directly affected by the rotation of the main claw shaft, and can secure the sealing performance for a long time when the extension shaft is unnecessary. At the same time, the overall cost can be reduced by selling the product with the joint member removed.

Further, since the outer case is provided on the bearing case for mounting an outer cover for covering the joint member from outside when the extension shaft is removed from the joint member connected to the support shaft portion, the extension shaft is provided. When it is necessary to temporarily remove the extension shaft during the used tilling work, the extension shaft can be removed from the joint member with the joint member attached, and the outer cover covering this joint member can be attached to the bearing case. In this way, the extension shaft can be attached and detached only by performing such a simple operation, and the bearing can be protected from mud by the outer cover which is not directly affected by the rotation of the main claw shaft.

Further, an inner cover mounting portion for mounting an inner cover that covers the bearing from the outside when the joint member is removed, and an outer cover mounting portion for mounting an outer cover that covers the inner cover from the outside, When the extension shaft is unnecessary, the joint member is removed, and the inner cover and outer cover are attached to the bearing case, so that the bearing can be reliably protected from mud by a double seal. Thus, since the cover for securing the sealing performance is attached to the fixed-side bearing case, there is no direct effect due to the rotation of the main claw shaft, and the sealing performance when the extension shaft is unnecessary. Can be secured for a long period of time, and by generally selling the product with the joint member removed, the overall cost can be reduced, and when an extension shaft is required. Only by attaching provide joint members separately, it can accommodate both the user without the user and the need to require an extension axis.

Further, the bearing case of the present invention rotatably supports the main pawl shaft having the extension shaft connected to the outer end, and includes a small-diameter cylindrical portion at the center of the shaft and a small-diameter cylindrical portion. A large-diameter cylindrical portion on the outer end side, and a bearing for rotatably supporting a support shaft provided at the outer end of the main claw shaft is provided inside the small-diameter cylindrical portion; Has an extension shaft attached to the outer end thereof, and the small-diameter cylindrical portion extends outwardly of the shaft from the outer end of the support shaft portion supported by the bearing. Since the outer end of the large-diameter cylindrical portion extends outwardly of the shaft from the outer end of the cylindrical portion, the inner cover can be fitted to the outer end of the small-diameter cylindrical portion, and The outer cover can be fitted to the outer end of the part, and a double seal can be obtained when the joint member for connecting the extension shaft is not attached. It is possible to achieve the reduction. Further, when the extension shaft is used, it is possible to remove the inner cover and the outer cover and connect the joint member for attaching the extension shaft to the shaft support portion of the main claw shaft.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an extension shaft mounting structure according to the present invention, in which an extension shaft is mounted.

FIG. 2 is an enlarged vertical sectional view showing a state where the extension shaft is removed and a joint member is mounted.

FIG. 3 is an enlarged vertical sectional view showing a state where the joint member is removed.

FIG. 4 is an overall side view of the rotary.

FIG. 5 is an overall plan view of the rotary.

FIG. 6 is a simplified rear view showing a state of a side cover when leveling tillage is performed.

FIG. 7 is a simplified rear view showing a state of a side cover when performing internal tilling.

FIG. 8 is an enlarged side view showing a rotary stand.

9A and 9B show a stored state of the stand, in which FIG. 9A is a front view, FIG. 9B is a side view, and FIG. 9C is a cross-sectional view showing a mounting state of a holding pin.

FIG. 10 is a perspective view showing an inward fixed tilling claw attached to a side frame.

FIG. 11 is a side view of the same.

FIG. 12 is a perspective view showing an outward fixed tilling claw attached to a side frame.

FIG. 13 is a simplified rear view showing a tilling operation state using the claw.

[Explanation of symbols]

 Reference Signs List 20 side drive rotary 27 bearing case 28 main claw shaft 29 tillage claw 34 joint member 35 extension shaft 37 small-diameter cylindrical portion 38 large-diameter cylindrical portion 39 support shaft portion 40 bearing 47 outer cover 49 outer cover mounting portion 52 inner cover 54 inner cover mounting Department

──────────────────────────────────────────────────の Continuing on the front page (72) Takahito Kurohara, Inventor 64, Ishizukitacho, Sakai City, Osaka Prefecture Inside the Kubota Sakai Works, Ltd. (72) Inventor Takashi Uchida 64, Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house (56) References JP-A-53-159902 (JP, U) JP-A-58-182602 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A01B 33/08

Claims (4)

(57) [Claims] 1. A support shaft (39) provided at the outer end of a main claw shaft (28) to which a number of tillage claws (29) are attached.
Are rotatably supported by a bearing (40) disposed in a bearing case (27), and the bearing case (27)
Is a small-diameter cylindrical portion (3) in which the bearing (40) is mounted.
7) and a large-diameter cylindrical portion (38) outside the small-diameter cylindrical portion (37).
A joint member (34) is detachably connected to the support shaft portion (39) from the outer end side, and an extension shaft (35) is detachably attached to the joint member (34). The cover ( 5 ) is configured to be able to be fixedly attached, and covers the bearing (40) from outside when the joint member (34) is removed.
2 ) The cover mounting portion ( 54) for mounting the small-diameter cylindrical portion
(37), the large-diameter cylindrical portion (38) is provided with the cover
-An extension shaft mounting structure for a side drive rotary, wherein (52) is covered from outside . 2. A support shaft (39) provided at an outer end of a main claw shaft (28) to which a number of tillage claws (29) are attached.
Are rotatably supported by a bearing (40) disposed in a bearing case (27), and the bearing case (27)
Is a small-diameter cylindrical portion (3) in which the bearing (40) is mounted.
7) and a large-diameter cylindrical portion (38) outside the small-diameter cylindrical portion (37).
A joint member (34) is detachably connected to the support shaft portion (39) from the outer end side , and a flange portion (34b) provided at an end of the joint member (34 ). extension <br/> long axis (35) is configured so as to freely mounted and fixed removably, extension shaft from the flange portion (34b) to (3
An outer cover attaching portion (49) for attaching an outer cover (47) that covers the flange portion (34b) from outside when the 5) is removed is provided on the large-diameter cylindrical portion (38).
The flange portion (34b) is located outside the small-diameter cylindrical portion (37).
An extension shaft mounting structure for a side drive rotary disposed between the end and the outer end of the large-diameter cylindrical portion (38) . 3. A support shaft (39) provided at an outer end of a main claw shaft (28) to which a number of tillage claws (29) are attached.
Is rotatably supported by a bearing (40) provided in a bearing case (27), and a joint member (34) is detachably connected to the support shaft (39) from the outer end side. The extension shaft (35) can be detachably attached and fixed to the joint member (34), and when the joint member (34) is removed, the bearing (40) is moved from outside. Inner cover attachment part (54) for attaching inner cover (52) to cover
And an outer cover (4) for covering the inner cover (52) from outside.
An extension shaft mounting structure for a side drive rotary provided in a bearing case (27) with an outer cover mounting portion (49) for mounting 7). 4. A side drive rotary bearing case for rotatably supporting a main claw shaft (28) having an extension shaft (35) connected to an outer end portion, wherein a small-diameter cylindrical portion (37) on the shaft center side. And a large-diameter cylindrical portion (38) on the outer end side of the small-diameter cylindrical portion (37). The small-diameter cylindrical portion (37) is provided at the outer end of the main claw shaft (28). A bearing (40) for rotatably supporting the provided support shaft (39) is provided therein, and the support shaft (39) has a joint member (40) for connecting an extension shaft (35) to the outer end thereof. 34), the small-diameter cylindrical portion (37) extends outwardly of the shaft from the outer end of the support shaft portion (39) supported by the bearing (40). A bearing case for a claw shaft, wherein an outer end of the large-diameter cylindrical portion (38) extends outwardly of the shaft from an outer end of the small-diameter cylindrical portion (37).