JPH0870601A - Wrapping preventive mechanism in rotary tiller - Google Patents

Abstract

PURPOSE: To provide the subject mechanism for preventing a tilling tine from getting shaky by means of attaching stays supporting a linear member and ensure the linear member to be equipped apart from the tilling shaft. CONSTITUTION: In this wrapping preventive mechanism so designed that attaching stays 29 supporting a linear member 28 along the axial direction of a tilling shaft 8 so as to be apart from the shaft 8 are fixed, respectively, the stays 29 are provided respectively with threading holes 30 for the base ends of a tilling tine 20. These stays 29 in contact with the tip of a tine bracket 23 so that the threading holes 30 correspond to respective engaging recesses 23A are made not to slip off by a slip off preuenting part 31 on the tilling tine 20 engaged through the holes 30 with the recesses 23A, and thus fixed on the tip of the bracket 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding prevention mechanism for a rotary tiller.

[0002]

2. Description of the Related Art For example, in a side-drive type rotary tiller, a large number of claw brackets having fitting recesses at the tip are provided on the outer peripheral surface of a tiller shaft rotatably supported around an axis. The turret is fixed to the cultivating shaft by bolting the base end of the cultivating pawl, which is projected in the direction and fitted in the fitting recess, to the pawl bracket.

In this case, in order to prevent a long culm such as grass from being wound around the tilling shaft, a long linear member along the axial direction of the tilling shaft may be provided apart from the tilling shaft. Conventionally, such a linear member is attached to a cultivating shaft by fixing each mounting stay supporting both ends and an intermediate portion of the member to one of the claw brackets. In this case, the cultivating claw is fixed to the claw bracket. The mounting stay is fixed to the side surface of the claw bracket by tightening the mounting stay together with the bolts (see Japanese Utility Model Laid-Open No. 4-110402).

[0004]

However, in the above conventional winding prevention mechanism, since the mounting stay is fastened together with the side surface of the claw bracket by the bolt for fixing the tilling claw, the long culm such as grass is a linear member. When a moment around the bolt is generated around the mounting stay by being wound around, the bolt may be loosened due to this moment, and thus the tilling claw may rattle or fall off.

Further, in order to effectively secure the effect of preventing the long culm from winding, it is necessary to separate the linear member from the tilling shaft as much as possible within the range where the tilling action by the tilling claws is not hindered. However, conventionally, since the mounting stay is fixed to the side surface of the claw bracket by the above-mentioned bolt, the arm length of the mounting stay must be made longer as the linear member is separated from the cultivating shaft. For this reason, a moment for loosening the bolt is likely to be generated, and the supporting force of the mounting stay supporting the linear member is also reduced.

In view of such an actual situation, the present invention prevents the tilling claw from rattling by the mounting stay that supports the linear member, and does not reduce the supporting force of the mounting stay. The object is to allow the strip-shaped member to be mounted away from the tilling shaft.

[0007]

In order to achieve the above object,
The present invention has taken the following technical means. That is, according to the present invention, a large number of claw brackets having fitting recesses at the tip are provided on the outer peripheral surface of the cultivating shaft rotatably supported around the axis so as to project radially outward of the cultivating shaft. A base end of the tilling claw fitted in the recess is bolted to a claw bracket, and a mounting member for supporting a linear member along the axial direction of the tilling shaft in any one of the claw brackets apart from the tilling shaft. In the winding prevention mechanism of the rotary tiller in which the stays are fixed, an insertion hole through which the base end of the tilling claw can be inserted is provided in the attachment stay, and the insertion hole corresponds to the fitting recess. The mounting stay, which is in contact with the tip of the claw bracket, is fixed to the tip of the claw bracket by retaining the retaining stay formed in the tilling claw that passes through the insertion hole and fits in the fitting recess. Fixed And wherein the Rukoto.

In this case, of the plurality of mounting stays supporting the linear member, one mounting stay is connected to the linear member so as not to move in the axial direction, and the other mounting stays are connected to the linear member. With play, it can be connected axially movable and rotatable. Further, among the plurality of mounting stays supporting the linear member, the mounting stay supporting the end portion of the linear member is connected to the linear member so as not to be axially movable and swingable. Good.

[0009]

In the present invention, the mounting stay 29 is attached to the tip of the claw bracket 23 so that the insertion hole 30 corresponds to the fitting recess 23A.
And the retaining stays 31 and 34 formed on the tilling claw 20 that fits into the fitting recess 23A after passing through the insertion hole 30 of the attaching stay 29 prevents the attaching stay 29 from coming off. Since 29 is fixed to the claw bracket 23, even if a long culm such as grass winds around the linear member 28 and a moment is generated in the mounting stay 29, this moment all acts on the base end of the tilling claw 20. It does not affect the bolt 24 attaching the tiller 20.

Further, the mounting stay 29 is attached to the claw bracket 23.
Since it is fixed to the tip of the mounting member 29, even if the linear member 28 is separated from the tilling shaft 8 by a considerable distance, it is not necessary to lengthen the arm length of the mounting stay 29.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 to 5 show a first embodiment of the present invention. In the present embodiment, the present invention is applied to a side drive type rotary tiller 1. 2 and 3, the rotary tiller 1 is attached to the tractor 2 via a three-point link mechanism 3, and a chain case 6 is provided at both ends of a support arm 5 extending from the power receiving gearbox 4 to the left and right. And a side frame 7.

The chain case 6 and the side frame 7
A case 9 of a bearing for rotatably supporting the cultivating shaft 8 around its axis is attached to the inside of the lower end of the tractor 2, and the power receiving shaft 10 projecting forward from the gear box 4 has a PTO of the tractor 2. The shaft 11 is linked by a joint 12. Inside the support arm 5,
A power transmission shaft 14 that is driven via a power receiving shaft 10 and a gear 13 is provided inside, and a sprocket 15 that is provided above the chain case 6 is fixed to one end of the transmission shaft 14. A transmission chain 17 of the sprocket 15 and a sprocket 16 provided at one end of the cultivating shaft 8 is wound around, and thereby the driving force of the PTO shaft 11 drives the cultivating shaft 8 to rotate.

A power transmission system to the PTO shaft 11 inside the tractor 2 is provided with a not-shown one-way clutch, which causes the tiller shaft 8 to rotate and drive (direction of arrow A in FIG. 3). By making it possible to idle and not idling in the opposite direction, the impact on the gears of the PTO power transmission system is reduced. Also, as shown in FIG.
The support arm 5 has a rectangular support frame 1 in plan view.
8 is projected rearward, and a grounding wheel 19 for adjusting the tilling height is provided at the rear portion of the support frame 18.

As shown in FIGS. 1 and 2, on the outer peripheral surface of the cultivating shaft 8, a plurality of cultivating claws 20 are erected on the cultivating portion 21.
The upper part of the tilling part 21 is covered with a cover 22. That is, on the outer peripheral surface of the cultivating shaft 8, a large number of rectangular tube-shaped claw brackets 23 each having a fitting recess 23A at the tip are provided so as to project radially outward of the cultivating shaft 8, and the claw brackets 23 Plowing claw 20 fitted in the mating recess 23A
By tightening bolts 24 respectively, a large number of tillers 2
0 are radially attached to the outer peripheral surface of the tiller shaft 8.

Through holes 25 and 26 of the bolt 24 are provided at both left and right side walls of the claw bracket 23 and at the base end of each tilling claw 20, and the base of the tilling claw 19 is fitted into the fitting recess 18A of the claw bracket 18. When the ends are fitted together, both through holes 25,
26 is concentrically positioned. Then, the bolt 24 inserted in the axial direction of the tilling shaft 8 into both the through holes 21 and 22 positioned concentrically is tightened with the nut 27, so that the tilling claw 20 is fixed to the claw bracket 23.
Can be fixed against.

In the illustrated example, the claw bracket 23 is formed in a rectangular tube shape, but the bracket 23 may be composed of a pair of plate pieces spaced apart in the axial direction of the tilling shaft 8 and opposed to each other. In the cultivating part 21 of the rotary cultivating device 1,
In order to prevent long culms such as grass from wrapping around the cultivating shaft 8,
The long linear member 28 along the axial direction of the cultivating shaft 8 is the cultivating shaft 8.
Is provided separately from.

The linear member 25 of this embodiment is made of a long steel rod which is slightly shorter than the tilling shaft 8, and has three mounting stays 29 at both ends and an intermediate portion thereof. Each of the mounting stays 29 is fixed to the claw brackets 23 located at both axial end portions and the middle portion of the cultivating shaft 8, and supports the linear member 25 at three points in a state of being separated from the cultivating shaft 8. . Each of the mounting stays 29 is formed in a rectangular shape that is substantially the same as or slightly larger than the opening edge portion at the tip of the claw bracket 23, and has an insertion hole 30 inside through which the base end portion of the tilling claw 20 can be inserted. On the other hand, the mounting stay 29 is provided on the side surface of the tiller 20.
Reinforcing ribs 31 that act as retaining portions are integrally formed.

Therefore, as shown in FIG. 1A, each mounting stay 29 is brought into contact with the opening edge of the corresponding claw bracket 24 so that the insertion hole 30 corresponds to the fitting recess 23A. . After that, each mounting stay 29 is attached to the tilling claw 20.
When the base end of the cultivating claw 20 passes through the insertion hole 30 and is fitted into the fitting recess 23A, it is prevented from coming off by the reinforcing rib 31 of the cultivating claw 20, and then the base end of the cultivating claw 20 is fastened with the bolt 24. It is fixed to each claw bracket 23.

In this embodiment, the linear member 28 is used as described above.
Of the three mounting stays 29 that support the linear member 28
The mounting stay 29A that supports one end portion (the right end portion in FIG. 1A) is connected to the linear member 28 by welding 32 so as to be immovable in the axial direction. On the other hand, other mounting stays 29B
A mounting cylinder 33 having an inner diameter larger than the outer diameter of the linear member 28 is fixed to the end of the linear member 28. By fitting the mounting cylinder 33 onto the linear member 28, the mounting stay 29B becomes a linear member. On the other hand, they are connected to each other so as to be free to move in the axial direction and freely rotatable.

Therefore, although the linear member 28 is fixed in the axial direction by the mounting stay 29A supporting one end thereof, the other mounting stays 29B are axially movable and rotatable with respect to the linear member 28. Therefore, the linear member 28 can be attached to the claw brackets 23 having different axial positions and different projecting directions. Further, since the other mounting stays 29B are connected to the linear member 28 with play, the linear member 28 is properly supported even if the linear member 28 is slightly inclined with respect to the axial direction of the tilling shaft 8. it can.

The retaining portion of the tilling claw 20 is not limited to the reinforcing rib 31, but notches 34 may be formed on both sides (or one side) of the base end portion as shown in FIG. Can also be configured. As means for connecting the attachment stay 29A that supports one end of the linear member 28 so as to be immovable in the axial direction, a means shown in FIG.

Of these, the mounting stay 2 is shown in FIG.
9A is rotatably connected to the linear member 28 via a mounting tube 33, and a bent portion 35 formed at one end of the linear member 28.
The beta pin 36 provided in the radial direction of the linear member 28 makes the mounting stay 29A immovable in the axial direction. In addition, in FIG. 5B, the bent portion 3 of FIG.
Instead of No. 5, a retaining portion 37 formed by flatly forging one end of the linear member 28 is adopted.

6 and 7 show a second embodiment of the present invention. This embodiment is common with the first embodiment in that the linear member 28 is made of a straight steel rod, but of the three mounting stays 29 that support the linear member 28, both ends of the linear member 28 are fixed. This is different from the first embodiment in that a mounting stay 29C that supports the portion is connected to the linear member 28 so as to be immovable in the axial direction and swingable.

That is, as shown in FIGS. 6 (a) and 6 (b), in this embodiment, the linear member 28 is provided in the mounting hole 38 formed at the end of the mounting stay 29C that supports both ends of the linear member 28. The attachment stay 29C is connected to the linear member 28 so as not to move in the axial direction and to be swingable by inserting the bent portion 39 formed by bending both ends of the. In addition, the retaining portion 29C is prevented from coming off by the bent portion 3 described above.
9 is folded back to form the step 40 (see FIG. 6).
(A)) This is done by inserting the beta pin 41 into the tip of the bent portion 39 (Fig. 6 (b)).

The mounting stay 29D for supporting the intermediate portion of the linear member 28 is connected to the linear member via the mounting cylinder 42 so as to be movable in the axial direction and rotatably with play, which will be described later. So that the linear member 28 can be attached obliquely to the cultivating shaft 8 as shown in FIG.
Is much shorter than the stay width. As described above, in the present embodiment, the mounting stays 29 at both ends of the linear member 28 are
Since C is swingable, for example, as shown in FIG.
Even if the barrel is considerably inclined with respect to the axial direction of the tiller shaft 8, the linear member 28 can be properly attached to the tiller shaft 8.

An axially immovable and swingable mounting stay 29C is provided only at one end of the linear member 28, and a rotatable mounting stay 29D is provided at the other end and intermediate portion of the linear member 28. It can also be adopted. Next, FIGS.
Shows a third embodiment of the present invention. In this embodiment, the linear member 28 is made of a wire rope which is slightly shorter than the cultivating shaft 8, and the mounting stays 29 are provided only at both ends of the linear member 28. Different from

That is, as shown in FIG. 8, the mounting stay 29E of this embodiment is provided with a standing wall portion 43 at one end in the width direction thereof, and bolts fixed to both ends of the linear member (wire rope) 28 on the standing wall portion 43. 44 is inserted, and this bolt 44
A nut 45 for tightening the standing wall portion 43 from the front and back is screwed into the. Therefore, by changing the screwing position of the nut 45, the mounting position of the mounting stay 29E in the axial direction of the linear member 28 can be adjusted.

Further, as shown in FIG. 8B, the standing wall portion 4
3 is inclined toward the pocket portion 20A side of the tillage claw 20, and a bolt insertion hole 46 is provided in a portion corresponding to this pocket portion 20A. In order to attach the linear member 28 of the present embodiment to the cultivating shaft 8, the claw brackets 23 positioned at both ends of the cultivating shaft 8 and oriented in the appropriate radial direction are selected, and the respective claw brackets 23 are selected.
Then, the mounting stay 29E may be fixed by the same procedure as in the first embodiment. In this case, the tension of the linear member 28 is adjusted by hooking the middle part thereof to another tilling claw 20 at the intermediate portion in the axial direction of the tiller shaft 8 as shown in FIG.

In this case, as long as the middle part of the linear member 28 does not hit the tooth part 20B of the tilling claw 20, the part shown in FIG.
Although it may be hooked to the front side in the rotation direction as in (a), in order to prevent the linear member 28 from being excessively pressed against the tilling claw 20 at the time of tilling, the tilling is performed as much as possible as shown in FIG. 10 (b). It is preferable to hook the claw 20 on the rear side (the pocket portion 20A side) in the rotation direction.

In each of the above-mentioned embodiments, two or more linear members 28 can be provided for one cultivating shaft 8. Further, the present invention is not limited to the above-mentioned respective embodiments, and can be applied to, for example, a center drive type rotary tiller.

[0031]

As described above, according to the present invention,
Since the mounting stay 29 is fixed to the tip of the claw bracket 23 by the retaining portions 31 and 34 of the tilling claw 20,
The moment that acts on the mounting stay 29 does not affect the bolt 24 that mounts the tilling claw 20, and the rattling and dropping of the tilling claw 20 can be prevented, and even when the linear member 28 is considerably separated from the tilling shaft 8. Since it is not necessary to lengthen the arm length of the mounting stay 29 so much, the linear member 28 can be mounted separately from the tilling shaft 8 without lowering the supporting force of the mounting stay 29.

According to the second aspect of the present invention, the optional mounting stay 29B is rotatably and axially movable with respect to the linear member 28 so that it can be freely moved in the axial direction. The linear member 28 can be attached to the different claw brackets 23. According to the invention as set forth in claim 3, since the mounting stay 29C at the end of the linear member 28 is swingable, the linear member 28 is attached to the cultivating shaft 8 depending on the protruding position of the claw bracket 23. The linear member 28 can be properly attached to the cultivating shaft 8 even when the linear member 28 is considerably inclined with respect to the axial direction of the cultivating shaft 8.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing a winding prevention mechanism of a rotary tiller according to a first embodiment, and FIG. 1 (b) is an enlarged sectional view of a mounting portion of a tilling claw.

FIG. 2 is a rear view of the rotary tiller.

FIG. 3 is a side view of the rotary tiller.

FIG. 4 is a perspective view showing a modified example of the retaining portion of the tilling claw.

FIG. 5 is a perspective view showing a modified example of a mounting stay provided at one end of a linear member.

6 (a) is a perspective view showing a winding prevention mechanism of the rotary tiller according to the second embodiment, and FIGS. 6 (b) and 6 (c) are perspective views showing a mounting stay provided at an end of the linear member. is there.

FIG. 7 is a plan view showing a state in which the linear member is attached to the cultivating shaft.

8A is a perspective view showing a winding prevention mechanism of a rotary tiller according to a third embodiment, FIG. 8B is a side view thereof, and FIG. 8C is a front view showing a mounting state of a mounting stay. is there.

FIG. 9 is a plan view showing how the linear member is attached to the cultivating shaft.

FIG. 10 is a side view showing a state in which the linear member is hooked on the tilling claw.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotary tiller 8 tiller shaft 20 tiller claw 23 claw bracket 23A fitting recess 24 bolt 28 linear member 29 mounting stay 30 insertion hole 31 retaining portion (reinforcing rib) 34 retaining portion (notch portion)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunji Fujimoto 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory (72) Inventor Kazumi Umeki 64, Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house

Claims (3)

[Claims] 1. A plurality of claw brackets (23) having fitting recesses (23A) at the tip are provided on the outer peripheral surface of a cultivating shaft (8) which is rotatably supported around an axis of the cultivating shaft (8). The base end of the tilling claw (20) which is provided in the radially outward direction and is fitted into the fitting recess (23A) is fastened to the claw bracket (23) by bolts (24), and the claw bracket (23) In either case, a linear member (2) extending along the axial direction of the tilling shaft (8) is used.
In a wrap-around prevention mechanism of a rotary cultivating apparatus, in which mounting stays (29) for supporting 8) apart from the cultivating shaft (8) are fixed, a base end of the cultivating claw (20) can be inserted. Hole (3
0) is provided in the mounting stay (29), and the mounting stay (29) is in contact with the tip of the pawl bracket (23) so that the insertion hole (30) corresponds to the fitting recess (23A). ) Pass through the insertion hole (30) and are retained by the retaining portions (31) (34) formed in the tilling nail (20) that fits in the fitting recess (23A), thereby retaining the nail bracket. A winding prevention mechanism for a rotary cultivating device, which is fixed to the tip of (23). 2. One of the plurality of mounting stays (29) supporting the linear member (28) is connected to the linear member (28) so as to be immovable in the axial direction, The other mounting stay (29B) is attached to the linear member (2
8. The winding prevention mechanism for a rotary cultivator according to claim 1, which is rotatably and axially movable with respect to 8). 3. The plurality of mounting stays (29) supporting the linear member (28), the mounting stay (29C) supporting an end portion of the linear member (28) is the linear member (28).
3. The winding prevention mechanism for a rotary tiller according to claim 2, wherein the mechanism is unmovable in the axial direction and swingably connected.