JPH09262003A - Rotor shaft of power tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor shaft of a power tiller, projecting from a power transmission case of the power tiller and facilitating a simple and rapid exchanging operation of a tillage operating unit having plural wheels and tillage tines, etc. SOLUTION: The rotor shafts of a power tiller are obtained by protruding them from a power transmission case 3 of the power tiller, forming polygonal parts on the sides of the power transmission case 3 in the axial direction and inserting parts 5 and 5 on the out sides in the axial direction, providing the inserting parts 5 and 5 with fixing large diameter parts 5a and 5a on the outer ends in the axial direction and forming the parts between the polygonal parts and the fixing large diameter parts 5a and 5a into guiding small diameter parts 5b and 5b. The diameter D1 of the fixing large diameter part 5a is regulated so as to be slightly larger than the diameter D2 of the virtual inscribed circle of the polygonal part and the diameter D3 of the guiding small diameter part 5b is regulated so as to be smaller than the diameter D2 of the virtual inscribed circle of the polygonal part. A tapered part 6 is formed at the boundary part between the polygonal part and the guiding small diameter part 5b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cultivating shaft for a cultivator capable of easily and quickly exchanging a cultivating work body or the like having a plurality of wheels and a plurality of cultivating blades protruding from a power transmission case of the cultivator. .

[0002]

2. Description of the Related Art Conventionally, a cultivating body having a plurality of wheels and cultivator blades according to various working conditions is provided on a cultivating shaft protruding from both left and right sides of a power transmission case of a cultivating machine (including a rotary type). It is equipped with attachments for running or plowing work. The cultivating shaft is formed in a polygonal shape such as a hexagonal shape or a square shape in a cross section orthogonal to the axial direction, and a polygonal shaft inserting hole into which the cultivating shaft is inserted is provided on the attachment side. The shaft insertion hole has a size such that the cultivating shaft hardly looses.

A worker alone performs the work of exchanging such attachments for traveling or tilling work or vice versa on cultivated land such as fields. Explaining the replacement procedure, for example, in the case of exchanging from a wheel to a cultivator work body, the worker manually supports the tilter from one of the left and right sides of the cultivator to the other side, and supports the left and right sides of the power transmission case. Use the wheel as a fulcrum and let the other wheel float above the ground.

Next, the wheel on the raised side is removed from the tilling shaft. This work is performed by one hand of the worker.
Next, the worker holds the tilling work body in hand, sets the rotary shaft having the shaft inserting hole of the tilling work body in the same direction as the tilling shaft, and inserts the tilling shaft into the shaft inserting hole. And the axis of rotation is
A retaining pin for connection is inserted and fixed together with the tilling shaft inserted in the shaft insertion hole. The above work is shown in FIG.
22 through 22.

[0005]

In the above-mentioned work, the worker always holds the cultivator with one hand so that one wheel of the cultivator or the cultivating work body is lifted from the ground. , One hand is closed. Therefore, attachments such as wheels and tillers must be replaced with only one hand.

During this work, the ground is generally unstable. Further, the tilling work body is heavy and too burdensome for the worker. Further, even if the cultivator is tilted forward with one hand and both the left and right wheels or the cultivating work body are raised and replaced, a great burden is similarly imposed on the worker.

Further, the shaft inserting work of the cultivating shaft and the rotary shaft of the attachment is such that the cross sections thereof are polygons such as hexagons and squares, and play is prevented. Therefore, the association at the time of insertion is extremely small, and the tillage shaft cannot be inserted into the shaft insertion hole unless the corners are completely matched.

Furthermore, since it is necessary to consider the position of the retaining pin, the work of exchanging the attachment becomes even more difficult and troublesome, and physical and mental fatigue is superimposed, and this work is easy to perform alone. Instead, it has the drawback of spending time and being exhausted.

[0009]

Therefore, as a result of intensive studies by the inventor to solve the above problems, the present invention protrudes from the power transmission case in the tiller, and the polygonal shaft portion protrudes from the axial power transmission case side. The outer side in the axial direction is the insertion shaft portion, the outer end portion in the axial direction of the insertion shaft portion is the fixing large diameter portion, and the portion between the fixing large diameter portion and the polygonal shaft portion is the guiding small diameter portion. The diameter of the fixing large diameter portion is slightly larger than the diameter of the polygonal shaft portion virtual inscribed circle of the polygonal shaft portion, and the diameter of the guiding small diameter portion is smaller than the diameter of the polygonal shaft portion virtual inscribed circle. Then, by using the cultivating shaft in the cultivator formed by forming a taper portion at the boundary between the polygonal shaft portion and the guide small diameter portion,
The above problem can be solved by easily and quickly exchanging a plowing work body or the like having a plurality of wheels and plowing blades.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, the engine 1 is mounted on the frame 2. The drive from the engine 1 drives the cultivating shaft A located below the frame 2 through a transmission mechanism such as a power transmission case 3 in which mechanisms such as a pulley, a belt and a chain are installed (see FIG. 1). There is also a type of structure in which the power from the engine 1 is transmitted to the tilling shaft A via the drive shaft (see Fig. 17).

In this type, the axle under the frame 2 is a traveling axle 16 dedicated to traveling, and tires are attached to it. The operation handle 15 is inclined rearward and upward from a protrusion provided on the frame 2 where the engine 1 is mounted or a casing portion, and is provided so that the elevation angle can be adjusted in multiple steps. It is provided so that it can be fixed at any desired position according to the height and working conditions of the. Further, the operation handle 15 can be set at the most suitable position (see FIG. 2).

The power transmission case 3 is provided with a tilling shaft A so as to project to the left and right sides. A chain sprocket is provided at the center of the cultivating shaft A in the axial direction and is housed inside the power transmission case 3 (see FIG. 1). In the cultivating work, the cultivating cylinder 11 equipped with the cultivating blade 12 is attached to the cultivating shaft A to perform the cultivating work, but it is also possible to mount wheels to drive on a general road. The cultivating shaft A has a polygonal shaft portion 4 as shown in FIGS. 1 and 3 to 5.
And the insertion shaft portion 5.

The portion where the tilling shaft A projects from the left and right sides of the power transmission case 3 is called the base side a. The polygonal shaft portion 4 has various polygonal cross-sectional shapes orthogonal to the axial direction, and as shown in FIG. 1, a hexagonal shape is preferable. Other sectional shapes may be triangular, square, pentagonal or octagonal. In the embodiment of the present invention, the cross section orthogonal to the axial direction of the polygonal shaft portion 4 will be mainly described as a hexagon.

The polygonal shaft portion 4 to the insertion shaft portion 5 may be integrally formed, or the insertion shaft portion 5 may be a separate member and fixed to the shaft end of the polygonal shaft portion 4 by welding means or the like. Good.
At the boundary between the polygonal shaft portion 4 and the guide small-diameter portion 5b, a taper portion 6 is formed in which the shaft diameter gradually increases from the tip side toward the base side. Specifically, the taper portion 6 exists between the corner portion of the polygonal shaft portion 4 and the outer diameter circumferential surface of the guiding small diameter portion 5b. [Refer to FIG. 1 and FIG. 4 (A)].

As shown in FIGS. 1 and 3 to 5, the insertion shaft portion 5 is composed of a large-diameter fixing portion 5a and a small-diameter guiding portion 5b. The small diameter portion 5b is continuous in the axial direction. Further, the guiding small diameter portion 5b is formed between the fixing large diameter portion 5a and the polygonal shaft portion 4. The fixing large-diameter portion 5a and the guiding small-diameter portion 5b of the insertion shaft portion 5 have a circular cross-sectional shape orthogonal to the axial direction. The insertion shaft portion 5 and the polygonal shaft portion 4 are formed continuously in the axial direction. The diameter of the fixing large diameter portion 5a is larger than that of the guiding small diameter portion 5b.

The diameter D ₁ of the large-diameter fixing portion 5a is larger than the diameter D _{2 of} the polygonal shaft portion virtual inscribed circle 4d inscribed in the cross section (hexagonal cross section) orthogonal to the polygonal shaft portion 4 in the axial direction. Is also slightly enlarged [Fig. 5 (A), (B), (C)]
reference〕. Further, the diameter D ₃ of the guiding small diameter portion 5b is smaller than the diameter D ₂ of the polygonal shaft portion virtual inscribed circle 4d. That is, the diameter D ₁ of the guiding thin portion 5b is the largest, the diameter D _{2 of the} polygonal shaft portion virtual inscribed circle 4d is the _second largest, and the diameter D ₃ of the guiding thin portion 5b is the smallest. Cage, D ₁ > D ₂ > D
_The relationship is ₃ [see FIGS. 5 (A) and 5 (B)].

On the cultivating shaft A, the power transmission case 3
The polygonal shaft portion 4 and the insertion shaft portion 5 projecting from one side thereof are such that, in their lengths, the polygonal shaft portion 4 is shortened and the insertion shaft portion 5 is lengthened (see FIG. 1, etc.). Specifically, the insertion shaft portion 5
Is about twice as long as the polygonal shaft portion 4, the insertion shaft portion 5 is 40 mm to 50 mm, and the polygonal shaft portion 4 is 20 mm to 2 mm.
It is 5 mm. Further, contrary to the above, there is an embodiment in which the polygonal shaft portion 4 is longer than the insertion shaft portion 5.
In this, as shown in FIGS. 13A and 13B, the length of the insertion shaft portion 5 is formed to be extremely shorter than the length of the polygonal shaft portion 4.

Next, the attachment B is a plowing work body B.
₂ [see FIGS. 2 and 16 (A) and (B)], or wheel B ₁ (see FIG. 17). The wheel B ₁ and the cultivating work body B ₂ are provided with a rotary shaft 10 for axially inserting the polygonal shaft portion 4 and the inserting shaft portion 5 of the cultivating shaft A (see FIG. 3). As shown in FIG. 6 (A), the rotating shaft 10 has a hollow cylindrical shape, and the hollow portion has a cross-sectional shape on the inner peripheral side as shown in FIG.
As shown in (B), it has the same shape as the polygonal shaft portion 4 of the tilling shaft A. That is, in the case of the embodiment in which the polygonal shaft portion 4 has a hexagonal shape, the inner peripheral shape of the hollow portion of the rotary shaft 10 also has a hexagonal shape.

Inner circumference of the rotating shaft 10 having a hexagonal cross section
Virtually inscribed circle 10d on the rotation axis side as the inscribed circle of
Diameter D₀[See FIG. 7 (A)]. Inscribed circle on the rotary shaft side 1
0d diameter D₀Is the hexagonal cross section of the rotary shaft 10.
It is the distance between the inner wall surfaces facing each other in parallel on the circumferential surface.
Then, with the cultivating shaft A inserted in the rotating shaft 10,
Diameter D of inscribed circle 10d on the rolling axis side₀And fixing of the insertion shaft portion 5
Diameter D for large diameter part 5a ₁ The clearance with
[See FIG. 7B], and then the diameter D₀And the multi-axis part 4
Diameter D of virtual inscribed circle 4d on the angular axis_TwoThe clearance with
It is very large [see FIG. 7 (C)].

Further, the clearance between the diameter D ₃ of the guide small-diameter portion 5b and the diameter D ₀ of the rotary shaft side inscribed circle 10d is maximum [see FIG. 7 (D)]. And the rotation axis 1
There is almost no play between the inner periphery of 0 and the large-diameter fixing portion 5a, and the insertion shaft portion 5 can be inserted into the inner periphery of the rotary shaft 10 with accuracy.

In the wheel B ₁ , a tire wheel is provided around the rotary shaft 10, and the tire is mounted on the tire wheel. Further, in the cultivating work body B ₂ , as shown in FIGS. 3 and 16 (A), a cultivating cylinder 11 is provided around the rotary shaft 10. The cultivating cylinder 11 has a polygonal cross section orthogonal to the axial direction. Specifically, the cultivating cylinder 11 has a hexagonal shape, a square shape or the like like the polygonal shaft portion 4, and further has a triangular shape, a pentagonal shape or There are octagonal shapes.
The cultivating cylinder 11 is provided with a connecting hole portion 11a, and the connecting hole portion 11a corresponds to the position of the through hole 10a of the rotary shaft 10.

Holders 11b, 11b, ... Are provided on the outer peripheral side surfaces of the cultivating cylinder 11, and the holders 11b, 11b ,.
Plowing blades 12, 12, ... Are attached to b, 11b ,. FIG. 16 shows another type of the tilling work body B ₂ .
As shown in (B), four plowing blades 12, 12, ... Are fixed to each corner of a substantially square plowing plate 13. The rotary shaft 10 penetrates through the central portion of the cultivating plate 13.

Next, the large diameter portion 5a for fixing the insertion shaft portion 5 is formed.
The side surfaces 4 forming the polygonal shape of the polygonal shaft portion 4 are
, a plurality of strip-shaped support surfaces 5d, which are flush with a, 4a, ...
5d, ... Are formed (see FIGS. 11A and 11B).
Further, an enlarged view of the belt-shaped support surface 5d is shown in FIG. 11 (C). The polygonal axis portion virtual inscribed circle 4d is shown by an imaginary line (two-dot chain line), and the large diameter fixing portion 5a is shown by a solid line. It is shown that the imaginary line indicating the diameter D ₂ of the polygonal shaft portion virtual inscribed circle 4d is slightly smaller than the diameter D ₁ of the large diameter fixing portion 5a.

The belt-like support surfaces 5d, 5d, ... Are formed on the circumferential side surface of the insertion shaft portion 5 at substantially equal intervals. For example, the insertion shaft 5 corresponds to the polygonal shaft 4 having a hexagonal cross section.
Are formed with six strip-shaped supporting surfaces 5d, 5d, .... The band-shaped support surfaces 5d, 5d, ... Support the rotary shaft 10 having a polygonal inner peripheral side surface of the attachment B, which will be described later, along the axial direction so as to prevent backlash.

The polygonal shaft portion 4 is formed with a fixing through hole 4b for the fixing pin 14 which is used as a retainer after the attachment B is mounted. Further, a fixing through hole 5c is also formed in the guide small-diameter portion 5b of the insertion shaft portion 5, and the tip portion of the large-diameter fixing portion 5a of the insertion shaft portion 5 is chamfered. The fixing through holes 4b, 5c
There may be a plurality formed along the axial direction, and the length of the connection by the shaft can be adjusted.

Further, the belt-shaped support surfaces 5d, 5d, ... Of the large-diameter fixing portion 5a of the insertion shaft portion 5 are substantially in contact with the inner peripheral side surface of the rotary shaft 10 of the attachment B. is there. That is, the inner peripheral side surface of the rotating shaft 10 and the large-diameter portion 5 for fixing
The contact state with a is substantially the same as that of the polygonal shaft portion 4, and the rotation shaft 10 has a structure in which play is extremely unlikely to occur across the polygonal shaft portion 4 and the insertion shaft portion 5.

A mark line groove 5e is formed in the insertion shaft portion 5. The mark linear groove 5e indicates the position of the fixing through hole 5c formed in the guide small diameter portion 5b formed in the insertion shaft portion 5, and as shown in FIGS. 13 (A) and 14 (A). Further, it is formed along the axial direction of the insertion shaft portion 5 toward the center of the fixing through hole 5c.

As shown in FIG. 14B, the mark line-shaped groove 5e is formed in a groove shape, and an operator can confirm the position of the fixing through hole 5c by the feel of the hand. And
As shown in FIG. 3, attach the mark B-shaped groove 5e to the attachment B.
The insertion shaft 5 is attached to the rotary shaft 10 so as to match the connecting hole 11a.

In FIGS. 15A, 15B and 15C, a pipe-shaped cultivating shaft constituting member A ₁ is attached to a polygonal shaft A ₂ from which the cultivating shaft A projects from the power transmission case 3. It is a thing. The cultivating axis A is constituted by the polygonal axis A ₂ and the cultivating axis constituting member A ₁ . Also in this type, the cultivating shaft constituting member A ₁ is formed with the polygonal shaft portion 4 and the inserting shaft portion 5, and the inserting shaft portion 5 is formed with the large fixing diameter portion 5a and the small guiding portion 5b.

[0030]

First, the work of exchanging the attachment B of the cultivating shaft A is generally performed in the procedure shown in FIGS. First, as shown in FIG. 18, the worker removes the wheel B ₁ while supporting the side surface of the cultivator with one hand and lifting the other wheel from the ground with one wheel of the cultivator as a fulcrum. Next, the rotary shaft 10 of the tilling work body B ₂ is inserted from the insertion shaft portion 5 of the tiller shaft A.

At this time, the respective corners of the cultivating shaft A with the polygonal shaft portion 4 and the respective corners of the inner peripheral side surface of the rotary shaft 10 do not have to correspond in position to each other. As shown in FIG. 8 (A), the positions of the corners of the inner peripheral side surface of the rotary shaft 10 and the corners of the polygonal shaft 4 may not match.

While properly rotating the attachment B in the axial direction, the side surface of the rotary shaft 10 in which the through hole 10a is formed and the side surface of the tiller shaft A in which the fixing through holes 4a and 5b are formed. The corners of the inner peripheral side surface of the rotary shaft 10 are aligned with each other and aligned with the positions corresponding to the corners of the polygonal shaft 4 (see FIG. 8B).

Next, the polygonal shaft portion 4 of the cultivating shaft A is inserted into the rotary shaft 10 and the through hole 10a and the fixing through hole 4 for the cultivating shaft A are inserted.
Match the positions of a and 5b. Next, the fixing pin 14 is inserted from the outside of the attachment B, and the fixing pin 14 is passed through the through hole 10a of the rotary shaft 10 and the fixing through holes 4a and 5b of the cultivating shaft A to fix the attachment B to the cultivating shaft A. .

FIGS. 9A to 9C show a series of work situations. At this time, by aligning the opening portion of the rotary shaft 10 with the six tapered portions of the cultivating shaft A, the rotary shaft 10 can be easily rotated in the circumferential direction.
The work of pushing 0 from the insertion shaft portion 5 to the polygonal shaft portion 4 side becomes easy.

Further, in the one-wheel management machine, the cultivating shaft A is one, but in this case, the one-wheel management machine is tilted to the front side, and the attachment B is attached to the cultivating shaft A and the above-mentioned cultivating machine is used. Wear in the same manner as.

[0036]

According to the first aspect of the present invention, the polygonal shaft portion 4 is projected from the power transmission case 3 of the cultivator, is formed from the axial power transmission case 3 side, and the axially outer side is the insertion shaft portion 5. The portion 5 has an axially outer end portion as a fixing large-diameter portion 5a, and a portion between the fixing large-diameter portion 5a and the polygonal shaft portion 4 is a guiding small-diameter portion 5b. Diameter D
₁ is slightly larger than the diameter D ₂ of the polygonal shaft portion virtual inscribed circle 4d of the polygonal shaft portion 4, and the diameter D ₃ of the guide small diameter portion 5b is the diameter D _{2 of the} polygonal shaft portion virtual inscribed circle 4d. First, by replacing the attachment B in the cultivating shaft A with the cultivating shaft in the cultivating machine, which is smaller and has a taper portion at the boundary between the polygonal shaft portion 4 and the guiding small diameter portion 5b. Can be performed easily and with a small amount of labor, and secondly, various effects can be obtained such that play can be extremely reduced.

The above effect will be described in detail. The cultivating shaft A is composed of a polygonal shaft portion 4 and an inserting shaft portion 5, and the inserting shaft portion 5 has a large fixing diameter portion 5a and a small guiding portion diameter 5b. And a small guide portion 5b is provided between the fixing large diameter portion 5a and the polygonal shaft portion 4. Further, the diameter D ₁ of the large diameter fixing portion 5a is equal to the virtual inscribed circle 4d of the polygonal shaft portion of the polygonal shaft portion 4.
Of slightly greater than the diameter D _2, the diameter D ₃ of the guide for the small diameter portion 5b is smaller than the diameter D ₂ of the polygonal shaft section imaginary inscribed circle 4d.

Therefore, when the attachment B having the rotary shaft 10 whose inner peripheral side surface is similar to the polygonal shaft portion 4 is mounted on the cultivating shaft A, the large diameter for fixing the insertion shaft portion 5 at the tip end of the cultivating shaft A. The rotation shaft 10 of the attachment B is inserted from the portion 5a. Therefore, when the cultivating shaft A is inserted into the rotary shaft 10, the guiding small-diameter portion 5b becomes a non-contact part when the cultivating shaft A is inserted into the rotary shaft 10, so that the insertion shaft portion 5 can be easily inserted [Fig. 10 (A)]. Further, even if the rotary shaft 10 or the insertion shaft portion 5 slightly touches at the time of insertion, it can be inserted because the narrow guide portion 5b is not in contact [see FIG. 10 (B)].

This work is extremely simple and quick. That is, in the conventional type, since the entire cross section has a polygonal shape in the axial direction, the rotary shaft 10 of the attachment B must be aligned with the polygonal axis from the beginning of the mounting operation. While searching for a place where the corners match each other, the hand of the worker holding the attachment B is physically tired by the weight of the attachment B and is physically given to the worker.
Mental fatigue increases. On the other hand, in the present invention,
First, by inserting the insertion shaft portion 5 of the cultivating shaft A into the rotary shaft 10 of the attachment B, the attachment B can be brought into a substantially temporarily fixed state with respect to the cultivating shaft A.

Therefore, the worker is in charge of the attachment B.
The hand for exchanging the attachment B does not need to be held in the hand, and has a much higher degree of freedom than the conventional type, and it is possible to perform good work without causing physical fatigue or burden on the worker. It is possible.

Further, in the present invention, the tilling shaft A is composed of the polygonal shaft portion 4 and the insertion shaft portion 5, and the insertion shaft portion 5 having a circular cross section is simply provided at the tip of the polygonal shaft portion 4. Is the structure of. Therefore, there is also an advantage that the shape and structure can be simplified and the price can be reduced.

Further, since the tapered portion 6 is formed between the guiding small-diameter portion 5b and the polygonal shaft portion 4, when the rotary shaft 10 is inserted into the polygonal shaft portion 4 via the insertion shaft portion 5, The tapered portion 6 makes the deformed state between the insertion shaft portion 5 and the polygonal shaft portion 4 smooth, and pushes the rotary shaft 10 of the attachment B into the polygonal shaft portion 4 from the guide small-diameter portion 5b of the insertion shaft portion 5. In this case, there is no feeling of resistance or impact, and it is possible to more easily and smoothly mount.

Next, in the invention of claim 2, in claim 1, in the fixing large-diameter portion 5a, a plurality of strip-shaped support surfaces 5d, 5d, ... Which are flush with the respective side surfaces of the polygonal shaft portion 4 are provided. The support of the attachment B can be further stabilized by using the cultivating shaft in the cultivator having the above structure.

[0044] That is, planar support surface 5d formed around the fixing large diameter portion 5a, 5d, ..., the diameter D ₁ of the fixing large diameter part 5a than the diameter D ₂ of the polygonal shaft section imaginary inscribed circle 4d Is slightly larger and is formed so as to be flush with each side surface of the polygonal shaft portion 4, so that the same contact state as the contact state between the inner peripheral side surface of the rotating shaft 10 and the polygonal shaft portion 4 is applied. The contact state is the strip-shaped support surface 5
The insertion shaft portion 5 can also be maintained via c, 5c, .... Therefore, not only in the polygonal shaft portion 4 of the tilling shaft A but also in the fixing large-diameter portion 5a of the insertion shaft portion 5, it is possible to prevent looseness between the rotary shaft 10 and the inner peripheral side surface.

Next, in the invention of claim 3, in claim 1, a mark linear groove 5e at a position of the fixing through hole 5c orthogonal to the axial direction is formed in the insertion shaft portion 5 along the axial direction. By using the tiller shaft in the tiller, the tiller shaft A
When inserting the rotary shaft 10 of the attachment B into the attachment line groove 5e of the attachment B
By inserting it while matching it with the position of a, the positions of the large diameter fixing portion 5a of the tiller shaft and the connecting hole portion 11a can be matched, and the fixing pin 14 can be mounted extremely efficiently.

[Brief description of drawings]

FIG. 1 is a perspective view showing a power transmission case and a cultivating shaft in the present invention.

[Figure 2] Side view of the tiller

FIG. 3 is a perspective view showing a main part of a cultivating shaft and a rotating shaft.

FIG. 4 is a perspective view seen from a polygonal shaft portion of the tilling shaft.

FIG. 5 (A) is a side view of the cultivating shaft. (B) is a side view of the cultivating shaft seen from another direction. (C) is a view of the cultivating shaft seen from the large diameter portion side for fixing.

FIG. 6A is a plan view showing a state in which the rotary shaft is separated from the insertion shaft portion of the tillage shaft, and FIG. 6B is a view taken along line X ₀ -X _{0 of} FIG.

[FIG. 7] (A) shows a rotary shaft inserted into an insertion shaft portion of a cultivating shaft,
A plan view with the corners aligned (B) is the X of (A)
_1- X ₁ arrow sectional view (C) is an X ₂ -X ₂ arrow sectional view of (A), (D) is an X ₃ -X ₃ arrow sectional view of (A)

[FIG. 8] (A) is a side view of the state where the rotary shaft is inserted into the inserting shaft portion of the tilling shaft, and [B] is a side view of the state where the rotating shaft is inserted into the inserting shaft portion of the tilling shaft and the tilling shaft is rotated. Figure

9 (A), (B), and (C) are perspective views showing a process of inserting a cultivating shaft into a rotary shaft.

FIG. 10 (A) is an operation diagram showing a state in which the rotary shaft is inserted into the insertion shaft portion of the cultivating shaft. FIG. 10 (B) is an operation diagram in which the corner portions are aligned with each other. Action diagram showing a state where it can be inserted even if it is slightly tilted

FIG. 11A is a perspective view of a cultivating shaft as seen from a polygonal shaft portion of an embodiment in which a large-diameter fixing portion has a belt-shaped supporting surface. FIG. 11B shows a fixing large-diameter portion having a belt-shaped supporting surface. Side view of the embodiment (C) is an enlarged cross-sectional view taken along arrow X ₄ -X ₄ of (B)

FIG. 12 (A) is a vertical sectional side view showing a state in which a cultivating shaft having a belt-like supporting surface is inserted into a rotary shaft. (B) is an enlarged cross-sectional view taken along line X ₅ -X ₅ of (A). ) Enlarged sectional view

FIG. 13 (A) is a perspective view of another type of cultivating shaft according to the present invention, and (B) is a perspective view of another type of cultivating shaft according to the present invention in which a mark linear groove is formed.

FIG. 14 (A) is a side view of a cultivating shaft provided with a mark linear groove, and (B) is a cross-sectional view taken along line X ₆ -X ₆ of (A).

FIG. 15 (A) is a vertical sectional side view of an embodiment in which the tillage shaft of the present invention is composed of a shaft and a tubular body. (B) is a sectional view taken along line X ₇ -X ₇ of (A). ) X ₈ -X ₈ sectional view

FIG. 16 (A) is a perspective view showing a tilling work body of an attachment. FIG. 16 (B) is a perspective view showing a tilling work body of another type of attachment.

FIG. 17 is a side view of a tiller equipped with a shaft drive type mechanism.

FIG. 18 is a schematic view showing a working state in which the attachment of the cultivator is being replaced.

FIG. 19 is a schematic front view showing a state in which one wheel of the cultivator is used as a fulcrum to tilt the cultivator, and the other wheel is floated from the ground to be removed from the cultivating shaft.

FIG. 20 is a schematic front view of a state in which an attachment made of a cultivating work body is about to be attached to the cultivating shaft.

FIG. 21 is a schematic front view showing a state in which an attachment made of a tilling work body is attached to the tilling shaft.

FIG. 22 is a schematic front view of a state in which an attachment made of a tilling work body is attached to the tilling shafts on both sides.

[Explanation of symbols]

 A ... Tillage shaft 3 ... Power transmission case 4 ... Polygonal shaft portion 4d ... Virtual inscribed circle 5 ... Insertion shaft portion

Claims (3)

[Claims] 1. A polygonal shaft portion projecting from a power transmission case of a cultivator, an axial power transmission case side being a polygonal shaft portion, an axially outer side being an insertion shaft portion, and the axially outer end portion of the insertion shaft portion having a large diameter for fixing. And a small diameter portion for guiding between the fixing large diameter portion and the polygonal shaft portion, the diameter of the fixing large diameter portion is larger than the diameter of the polygonal shaft portion virtual inscribed circle of the polygonal shaft portion. Slightly larger,
The diameter of the small diameter guide portion is smaller than the diameter of the virtual inscribed circle of the polygonal shaft portion, and a tapered portion is formed at the boundary between the polygonal shaft portion and the small guide diameter portion. Tillage axis in the machine. 2. The cultivating shaft for a cultivator according to claim 1, wherein the fixing large-diameter portion is formed with a plurality of belt-shaped supporting surfaces that are flush with the respective side surfaces of the polygonal shaft portion. . 3. The cultivator according to claim 1, wherein the insertion shaft portion is formed with a mark linear groove at a position of a fixing through hole orthogonal to the axial direction along the axial direction. Tillage axis.