JPH09224403A - Tine axis loading/unloading structure for rotary power tiller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mechanically attach/detach a tine axis by vertically moving a rotary power tiller by means of hydraulic mechanism while an operator sits on the seat of a farm tractor. SOLUTION: In the tine axis of both flange type, projecting pins are arranged at the symmetrical position of the right and left flange and retractable lock pins 8 and 9 are assembled to a spring and a lever on the opposite side so that the rotation of the lever makes the lock pins 8 and 9 automatically project to fix the tine axis 11 and an opposite part. In addition, the recessed and projecting part of the flange surface to attach/detach is constituted to be the state of a taper to facilitate insertion in vertical direction of the tine axis 11 and constituted to be the state of a wedge to facilitate fitting in the horizontal direction of the tine axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a rotary cultivating apparatus mounted on a rear portion of an agricultural tractor for performing cultivating work, and is configured so that it can be easily performed when exchanging a claw together with a claw shaft.

[0002]

2. Description of the Related Art Conventionally, various techniques have been publicly known for a mechanism for easily attaching and detaching a pawl shaft of a rotary tiller. For example, Japanese Patent Publication No. 64-8961, Japanese Utility Model Publication 55-39924, and Japanese Utility Model Publication 53-52.
No. 808, No. 55-152911, No. 53-103801, No. 55-51121
It is like the technique described in Japanese Utility Model Publication No. 55-14081.

[0003]

However, in the prior art, it is necessary for the operator to lift the pawl shaft and the assistant to fix the pawl shaft to the rotary tiller by bolts. Therefore, the nail shaft could not be easily attached and detached. The present invention
With the operator sitting on the seat of the agricultural tractor, the rotary tiller is moved up and down by a hydraulic mechanism so that the pawl shaft can be mechanically attached and detached.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. According to the first aspect of the present invention, in both flange type claw shafts, pins protruding at symmetrical positions of the left and right flanges are provided, and on the other side, a lockable pin, a spring, and a lever are incorporated, and by rotating the lever, The lock pin is automatically projected to fix the claw shaft and the mating part.

According to the second aspect of the present invention, the concave and convex portions of the flange surface to be attached and detached are formed in a tapered shape so as to guide the insertion in the vertical direction of the pawl axis, and the concave and convex surfaces are formed in a wedge shape so that the pawl axis is horizontal. The configuration is such that the directions can be easily adjusted.

According to the third aspect of the present invention, the concave and convex portions of the flange surface to be attached and detached are tapered to guide the insertion in the vertical direction of the pawl axis, and two pin fitting holes are provided above and below one flange portion. In a configuration in which two lock pins that fit into the pin fitting holes are arranged above and below the other flange portion, the positions of the two lock pins at the top and bottom are eccentrically arranged with respect to the axis of the tillage claw shaft. It is a thing.

According to a fourth aspect of the present invention, the concave and convex portions of the flange surface to be attached and detached are formed in a tapered shape to guide the insertion in the vertical direction of the pawl axis, and two pin fitting holes are provided above and below one flange portion. In a configuration in which two lock pins to be fitted into the pin fitting holes are arranged above and below the other flange portion, the upper and lower two pin fitting holes and the lock pins are formed as square holes and square pins. is there.

According to a fifth aspect of the present invention, in the double-flange type pawl shaft, tapered wedges are provided at symmetrical positions on the outer surfaces of both flanges, and the side end arcuate surface on the narrow side of the wedge surface is centered. A female screw body in which the female screw is lowered is fixed, and the bite state is released by a push bolt screwed on the female screw body.

[0009]

Next, an embodiment of the present invention will be described. FIG. 1 is a front view of a rotary tiller equipped with a pawl shaft attaching / detaching structure for a rotary tiller of the present invention, and FIG. 2 is a pawl shaft attaching / detaching of a rotary tiller composed of a protruding engagement pin 1, a lock pin 2 and a release lever 3. Overhead view showing the structure, Fig. 3
Similarly, FIG. 4 is a front sectional view of the coupling state of the embodiment of FIG. 2, FIG. 4 is a side view showing the state of the coupling operation of the embodiment of FIG. 2, and FIG. 5 is a side view of the coupling flange 5 on the side of the pawl drive shaft 11. 6 is a plan sectional view of the coupling flange 5 on the side of the pawl drive shaft 11,
FIG. 7 is a plan view of the coupling flange 4 on the side of the tilling claw shaft 10 of the embodiment of FIG. 2, and FIG. 8 is a rear view of the coupling flange 4 at the side of the tilling claw shaft 10 as well.

Referring to FIG. 1, a rotary tiller equipped with a hook shaft attaching / detaching structure of the rotary tiller will be described. A PTO shaft projects from the rear part of the mission case of the agricultural tractor, and the PTO shaft is connected to the cultivating input shaft 31 projecting from the bevel gear box 30. The rotation of the cultivating input shaft 31 is converted into a horizontal rotation by a bevel gear in the bevel gear box 30, and a chain case 20 fixed to the end of the main beam 33 by the power transmission shaft 32.
Power is transmitted to.

The chain in the chain case 20 transmits the sprocket 19 fixed to the lower claw drive shaft 11. The sprocket 19 causes the pawl drive shaft 11
Is driven to rotate the tiller shaft 10 connected to the sprocket 19 by the connecting flange 4 and the connecting flange 5. A claw insertion bracket 16 is planted on the cultivating claw shaft 10, and a cultivating claw 17 is inserted and fixed to the claw inserting bracket 16.

Normally, the pawl drive shaft 11 and the plowing pawl shaft 10 are rarely disengaged, but in recent years, the plowing pawl shaft 10 and the plowing pawl 17 are all removed in order to switch between the up-cut plowing and the down-cut plowing. It may be replaced as a set, and in order to switch between normal speed tilling and high speed tilling, it becomes necessary to replace all of the tiller shaft 10 and tiller 17.

As described above, when the tiller claw shaft 10 and the tiller claw 17 can be exchanged in a set state, the conventional coupling flange configuration cannot be replaced by one operator, and a plurality of assistants are required. It was. That is, in order to match a heavy set of the tiller claw shaft 10 and the tiller claw 17 with the coupling flange portions protruding from the left and right claw drive shafts 11 and to fix them with the fastening bolts, the tiller claw shaft 10 is required. Therefore, it is necessary to lift the heavy tillage claw shaft 10 to a position where the claw drive shaft 11 and the claw drive shaft 11 coincide with each other.

According to the present invention, as in the conventional case, the set of the plowing claw shaft 10 and the plowing claw 17 is not lifted and fitted to the flange on the side of the claw driving shaft 11 held in the air, but the plowing claw shaft 10 and the plowing claw 17 are set. The set of the claws 17 is left on the ground, and the claw drive shaft 11 and the flange portion of the rotary cultivator are lowered onto the set of the claws 17 so that the weight of the rotary cultivator automatically causes the cultivating claws to be set. The shaft 10 and the pawl drive shaft 11 are matched with each other, and the coupling flanges are matched with each other.

An embodiment of the pawl shaft attaching / detaching structure of the first rotary tiller shown in FIGS. 2 to 8 will be described. In this structure, the set of the tillage claw shaft 10 and the coupling flange 5 is lowered from the upper side together with the rotary tiller. As shown in FIG.
As shown in FIG. 3, a locking cutout recess 21 and a fitting hole 40 for the lock pin 2 are formed.

As shown in FIGS. 5 and 6, the guide arc concave portion 34 extends to the engaging cutout concave portion 21, and the guide circular arc concave portion 34 is provided on the opposite side of the guide flange concave portion 34 of the coupling flange 5. Arc recesses 35 having substantially the same shape are formed. As a result, it is possible to obtain a weight in the circular arc concave portion 35 that matches the weight reduction amount of the guide circular arc concave portion 34. Further, the coupling flange 5 is provided with four screw holes 36 for fastening bolts for coupling the coupling flange 4 and the coupling flange 5 together. Reference numeral 14 denotes a rotation side straw wrap prevention plate, which rotates at the inner diameter portion of the fixed side straw wrap prevention plate 15 fixed to the inner side surface of the chain case 20 to prevent straw wrapping.

A lock pin 2 and a projecting engagement pin 1 are formed on the side of the connecting flange 4 which is connected to the connecting flange 5. As shown in FIG. 2, the rotary tiller side is gradually lowered from the upper side. At this time, the coupling flange 5 side is oriented in a direction in which the locking notch recess 21 is located downward. Fix it and then lower it. On the contrary, the side of the tillage claw shaft 10 and the coupling flange 4 is arranged so that the portion of the protruding engagement pin 1 is located above.

When the claw drive shaft 11 and the coupling flange 5 are lowered, the lock pin 2 protrudes from the coupling flange 4 and interferes with the coupling flange 5, so that the lock pin 2 retracts. I need to keep it. In order to move the lock pin 2 backward, the biasing spring 12 does not project the release lever 3 from the side surface of the coupling flange 4.
Push back against. In this way, the release lever 3
With the lock pin 2 pushed back against the biasing spring 12, the release lever 3 is locked at a position behind the L-shaped locking groove 37 provided in the sliding guide 13 of the lock pin 2. Of. In this way, by engaging the release lever 3 at the deep position of the L-shaped locking groove, the lock pin 2 is moved backward from the end face of the coupling flange 4 against the biasing spring 12. Is there.

As described above, since the tip of the lock pin 2 is retracted from the coupling flange 4, the coupling flange 4 and the coupling flange 5 are in close contact with each other, and the coupling flange 5 is
Can be lowered. Then, as shown in FIG. 4, when the protruding engagement pin 1 is fitted into the locking notch recess 21 from below and the rotary tiller is further lowered, the pawl drive shaft 1
1 and the position of the locking notch recess 21 into which the protruding engagement pin 1 is fitted are eccentric, so that the coupling flange 4 rotates about the protruding engagement pin 1, and the coupling flange 4 and the coupling flange 5 The coupling flange 4 rotates so that the cores of and match with each other.

The core of the pawl drive shaft 11 and the cultivating pawl shaft 1
The core of 0 approaches, the tip of the release lever 3 protruding from the lock pin 2 passes through the notch 37 on the outer periphery of the coupling flange 5, and finally the release lever 3 contacts the portion of the release cam 38. And the release lever 3 is forcibly removed from the deepest position of the L-shaped locking groove 39 of the sliding guide 13,
The lock pin 2 projects due to the force of the biasing spring 12. With the release lever 3 approaching the release cam 38, the position of the lock pin 2 is rotated to a position just before it coincides with the fitting hole 40, so that the release lever 3 is disengaged from the L-shaped locking groove 39. When the insertion hole 40 reaches the position of the lock pin 2 in a state where the lock pin 2 can be projected by the biasing spring 12, the lock pin 2 is naturally inserted into the insertion hole 40.

As a result, the protruding engagement pin 1 and the engaging cutout recess 21 are engaged with each other on one side, and the lock pin 2 and the insertion hole 40 are engaged with each other on the other side. The position of the flange 5 is in a state where the axes are aligned. In this state, the screw holes 36 of the coupling flange 5 and the bolt holes 49 of the coupling flange 4 are aligned at all four positions. Therefore, the fastening bolt 18 is inserted into this portion, and the coupling flange 4 and the coupling flange 5 are inserted. And can be securely fixed.

On the contrary, when removing the tillage claw shaft 10 from the claw drive shaft 11, first, all the fastening bolts 18 are removed from the fastening state, and the release lever 3 is moved to the back of the L-shaped locking groove 39. By retracting the rotary tiller until it engages with the coupling flange 4 and the coupling flange 5
Is rotated about the locking portion of the protruding engagement pin 1 and the locking notch recess 21 to disengage the fitting between the protruding engagement pin 1 and the fitting hole 40, and finally The rotary tiller moves up with the tiller shaft 10 left behind.

FIG. 9 is a bird's-eye view of a pawl shaft detaching structure of a rotary tiller equipped with a convex fitting portion A composed of a convex portion having a tapered shape and a wedge shape, and a concave fitting portion B constituted by a concave portion of the same shape. FIG. 10 is a front view showing a combined state of an embodiment constituted by the convex fitting portion A and the concave fitting portion B, and FIG. 11 is a coupling flange 6 on the side of the pawl drive shaft 11 and the convex fitting portion. 12 is a side view showing the configuration of A, FIG. 12 is a side view showing the shape of the coupling flange 7 on the side of the plowing claw shaft 10 and the concave fitting portion B, and FIG. 13 is a coupling flange 7 on the side of the plowing claw shaft 10 and the concave fitting. FIG. 14 is a side view showing the joint portion B, and FIG. 14 is also the joint flange 7 and the concave fitting portion B.
FIG. 15 is a front view showing the taper groove 22 of FIG. 15, and FIG. 15 shows the coupling flange 6 on the side of the claw drive shaft 11, the convex fitting portion A, and the pin fitting hole 25.
16 is a front sectional view of the pawl drive shaft 11 and the coupling flange 6.

Next, referring to FIG. 9 to FIG. 16, an embodiment of the pawl shaft attaching / detaching structure of the second rotary tiller will be described. In this structure, the coupling flange 6 on the side of the pawl drive shaft 11 is
A convex fitting portion A is formed, and a concave fitting portion B is formed on the coupling flange 7 on the side of the tillage claw shaft 10. Both the convex fitting portion A and the concave fitting portion B are wedge-shaped, but one is a convex portion and the other is a concave portion, and both are configured so that male and female can fit perfectly.

Further, the convex fitting portion A and the concave fitting portion B are not only formed in a wedge-shaped overall structure, but the end portions of the convex fitting portion A and the concave fitting portion B are tapered. It is configured in the shape portions 23 and 22. The tapered portions 23 and 22 are also configured so that the concave portion and the convex portion are fitted with each other exactly. Further, the pin fitting holes 25, 26 are formed in the convex fitting portion A on the coupling flange 6 side.
Are provided, and lock pins 8 and 9 are provided on the coupling flange 7 side.

As shown in FIG. 15, the pin fitting holes 25 and 26 are eccentric to the left and right, and when the lock pin 9 fitted in the pin fitting hole 26 passes through the pin fitting hole 25, It is configured so that it will not fit into. In this way, the pin fitting holes 25 and 26 are displaced, and the lock pins 8 and 9 are displaced, whereby the coupling flange 6
For the first time with the connecting flange 7 and the connecting flange 7 aligned with each other,
The lock pins 8 and 9 are configured to be fitted in the pin fitting holes 25 and 26.

The lock pins 8 and 9 are bias springs 41 and 42.
As a result, the coupling flange 6 is always connected from the coupling flange 7 side.
Is urged in the direction of projecting to the side. The lock pins 8 and 9 are slidably supported, and the slide brackets 29 and 30 holding the biasing springs 41 and 42 are fixed to the coupling flange 7 on the side of the tillage pawl shaft 10. The direction determining pin 27.2 is attached to the slide bracket 29.30.
Positioning notches 43 and 44 are cut so that the position can be determined in two directions, that is, the state in which 8 is facing up and the state in which it is facing down. The position-determining notches 43 and 44 have two notches facing upward, which are opened at two positions which are rotated by 180 degrees in the rotational direction of the direction-determining pins 27 and 28.

In FIG. 9, two notches, 43a and 43b, which form the position determining notch 43, are disclosed. That is, the tip ends of the lock pins 8 and 9 are formed by obliquely cutting the tip end of a round bar, and the slanted portion is formed at the tip end of the convex fitting portion A when the convex fitting portion A descends. Section 24
The lock pins 8 and 9 are pushed by
The slide brackets 29 and 30 are configured to be retracted against 42.

However, when the direction determining pins 27 and 28 are fitted in the opposite positions of the notch 43b, since the inclined surface faces downward, even if the coupling flange 6 is lowered from above, Since it contacts the upper surface of the lock pins 8 and 9,
The lock pins 8 and 9 cannot be lowered.

Therefore, when the tiller claw shaft 10 is mounted on the rotary tiller, the direction determining pin 27 is provided at the position determining notch 4.
When the plowing claw shaft 10 is to be removed from the rotary cultivating device, the direction determining pin 27 is fitted in the direction of the notch 43b of the position determining notch 43. Of.

The relationship between the lock pin 9, the direction determining pin 28, and the position determining notch 44 of the slide bracket 30 is the same, although there are differences in the vertical direction. Also,
The configurations of the coupling flange 6 and the coupling flange 7 are the same for the left and the right because the left and the right are symmetrically configured.

Further, when the plowing pawl shaft 10 and the pawl drive shaft 11 are removed from the state where the convex fitting portion A and the concave fitting portion B bite into each other, the directions of the direction determining pins 27 and 28 are changed. hand,
The convex fitting portion A and the concave fitting portion B in the bited state are not separated from each other only by lifting the rotary tiller. For such a case, a female screw body 31 is welded and fixed to the lower surface of the concave fitting portion B on the coupling flange 7 side, and a push bolt 32 is screwed to the female screw body 31, and a push bolt 32 is attached. By applying the tip of the to the convex fitting portion A, the separation is forcibly started.

FIG. 17 is a side view showing the coupling flange 6 having a configuration in which the upper and lower pin fitting holes 50 and 51 are linearly arranged on the center line, and FIG. 18 is a perspective view showing a configuration in which the lock pin 52 is a square pin. . 17 and 18 show an improvement plan of the configuration in which the pin fitting holes 25 and 26 are eccentrically arranged to the left and right in the second embodiment. That is, in this embodiment, the pin fitting holes 50 and 51 are arranged on the straight line passing through the axis with respect to the coupling flange 6. in this way,
When the pin insertion holes 50 and 51 are arranged on one straight line,
Of the upper and lower lock pins, the lower lock pin first fits into the upper pin fitting hole 50, and there is a risk that the convex fitting portion A will not descend further inside the concave fitting portion B. Of.

17 and 18, the pin fitting hole 5 is shown.
The lower pin fitting hole 51 of the 0.55 is a square hole, and the lower lock pin 52 of the upper and lower lock pins is a square pin. By thus forming the lock pin 52 as a square pin, even if the lock pin 52 of the square pin passes through the pin fitting hole 50 formed in the round hole, the lock pin 5 is
2 cannot be fitted into the pin fitting hole 50, which is a round hole,
It passes through as it is. As a matter of course,
The upper lock pin 8 is formed as a round pin as described above.

[0035]

As described above, the present invention has the following advantages. According to the first aspect of the present invention, in both flange type claw shafts, pins that project at symmetrical positions of the left and right flanges are provided, and on the other side, a lock pin that can move in and out is incorporated with a spring and a lever, and the lever rotates Since the lock pin is automatically projected to fix the claw shaft and the mating part, the operator holds the release lever 3 on the release side, and the plowing claw shaft 10
By lowering the rotary cultivator from above, the coupling flange 5 on the side of the pawl drive shaft 11 and the coupling flange 4 on the side of the cultivating pawl shaft 10 are automatically coupled by the projecting engagement pin 1 and the lock pin 2. Since the axes are aligned with each other, the operator can easily attach / detach the tiller shaft 10.

According to a second aspect of the present invention, by forming the concavo-convex portion of the flange surface to be attached / detached into a tapered shape, insertion in the vertical direction of the pawl axis is facilitated, and by forming the concavo-convex surface into a wedge shape, the pawl shaft horizontal direction. The direction can be easily adjusted. Further, since the convex fitting portion A and the concave fitting portion B are wedge-shaped and the tapered groove 22 is provided, when the convex fitting portion A of the coupling flange 6 descends from above, the concave fitting of the coupling flange 7 is performed. Since the fitting portion B is gradually fitted in the tightened state, the bolt vertical portion 7c can be formed without screwing a fastening bolt separately.
Thus, the plowing claw shaft 10 and the claw driving shaft 11 can be connected.

According to the third aspect of the present invention, the concave and convex portions of the flange surface to be attached and detached are tapered to facilitate insertion in the vertical direction of the pawl axis, and two pin fitting holes are provided above and below one flange portion. In a configuration in which two lock pins that fit into the pin fitting holes are arranged above and below the other flange portion, the positions of the two lock pins at the top and bottom are eccentrically arranged with respect to the axis of the tillage claw shaft. Therefore, in the fitted state of the convex fitting portion A and the concave fitting portion B, by the two lock pins 8 and 9,
When trying to fasten in place of the fastening bolt, the lower pin fits into the upper hole first, and the convex fitting part A cannot fit into the concave fitting part B any more. I was able to resolve it.

According to the fourth aspect of the present invention, the concave-convex portion of the flange surface to be attached / detached is formed in a tapered shape to facilitate insertion in the direction perpendicular to the pawl axis, and to provide two pin fitting holes above and below one flange portion. In the configuration in which the two lock pins that fit into the pin fitting holes are arranged above and below the other flange portion, the pin fitting holes and the lock pins at the two upper and lower positions are the square holes and the square pins. If the lower lock pin 52 is a square pin, it will not fit into the hole of the upper round pin, so
It is possible to arrange the upper and lower pin fitting holes 50 and 51 on a straight line passing through the axis, and the strength of the convex fitting portion A and the concave fitting portion B can be increased.

According to a fifth aspect of the present invention, in a double-flange type pawl shaft, tapered wedges are provided at symmetrical positions on the outer surfaces of both flanges, and the side end circular arc surface on the narrow side of the wedge surface is centrally located. Since the female screw body in which the female screw is lowered is fixed and the bite state is released by the push bolt screwed to the female screw body, the convex fitting portion A and the concave fitting portion B are rusted or bite. In the case of burrs, the female screw body 31 and the push bolt 32 can be used to easily obtain the disengaged state of both.

[Brief description of drawings]

FIG. 1 is a front view of a rotary tiller equipped with a pawl shaft attachment / detachment structure for a rotary tiller according to the present invention.

FIG. 2 is a protruding engagement pin 1, a lock pin 2, and a release lever 3.
FIG. 1 is a bird's-eye view showing a pawl shaft attaching / detaching structure of a rotary cultivating device configured by the above.

FIG. 3 is a front sectional view of the embodiment of FIG. 2 in a coupled state.

FIG. 4 is a side view showing a state during the coupling work of the embodiment of FIG.

FIG. 5 is a side view of the coupling flange 5 on the side of the pawl drive shaft 11.

FIG. 6 is a plan sectional view of the coupling flange 5 on the side of the pawl drive shaft 11 in the same manner.

FIG. 7 is a plan view of the coupling flange 4 on the side of the tillage claw shaft 10 of the embodiment of FIG.

FIG. 8 is a rear view of the coupling flange 4 on the side of the tillage claw shaft 10 as well.

FIG. 9 is a convex fitting portion A formed by a tapered and wedge-shaped convex portion and a concave fitting portion B formed by a concave portion of the same shape.
FIG. 1 is a bird's-eye view of a pawl shaft attaching / detaching structure of a rotary cultivator equipped with the above.

FIG. 10 is a front view showing a combined state of an embodiment constituted by the convex fitting portion A and the concave fitting portion B.

FIG. 11 is a side view showing the configurations of the coupling flange 6 and the convex fitting portion A on the side of the pawl drive shaft 11.

FIG. 12 is a side view showing the shapes of the coupling flange 7 and the concave fitting portion B on the side of the tillage claw shaft 10.

FIG. 13 is a side view showing the coupling flange 7 and the concave fitting portion B on the side of the tillage claw shaft 10.

FIG. 14 is a front view showing the coupling flange 7 and the tapered groove 22 of the concave fitting portion B in the same manner.

FIG. 15 is a drawing showing the positions of the coupling flange 6 on the side of the pawl drive shaft 11, the convex fitting portion A, and the pin fitting holes 25 and 26.

16 is a front sectional view of the pawl drive shaft 11 and the coupling flange 6. FIG.

FIG. 17 is a side view showing a coupling flange 6 having a configuration in which upper and lower pin fitting holes 50 and 51 are linearly arranged on a center line.

FIG. 18 is a perspective view showing a configuration in which the lock pin 52 is a square pin.

[Explanation of symbols]

 A convex fitting part B concave fitting part 1 protruding engagement pin 2 lock pin 3 release lever 4, 5, 6, 7 coupling flange 8, 9 lock pin 10 plowing pawl shaft 11 pawl drive shaft

Claims (5)

[Claims] 1. A double-flange type pawl shaft is provided with protruding pins at symmetrical positions of the left and right flanges, and a lock pin, a spring and a lever which can be inserted and removed on the opposite side are incorporated, and the lever is rotated to automatically A structure for detaching a pawl shaft of a rotary cultivating device, characterized in that a lock pin is projected so that a pawl shaft and a mating portion are fixed to each other. 2. The insertion / removal of a flange surface is formed by tapering the uneven portion of the flange surface to be attached / detached,
Further, the claw shaft attaching / detaching structure of the rotary tiller is characterized in that the uneven surface is formed in a wedge shape so that the horizontal direction of the claw shaft can be easily aligned. 3. A concave-convex portion of a flange surface to be attached / detached is formed in a tapered shape to facilitate insertion in a direction perpendicular to a pawl axis, and two pin insertion holes are provided above and below one flange portion, and the other flange is provided. In a configuration in which two lock pins fitted into the pin fitting holes are arranged above and below the part
A pawl shaft attachment / detachment structure for a rotary tiller, wherein the positions of the lock pins are arranged eccentrically with respect to the shaft center of the tillage pawl shaft. 4. The insertion / removal of the flange surface is tapered to guide insertion in the direction perpendicular to the claw axis,
Two pin insertion holes are provided above and below one flange,
In a configuration in which two lock pins fitted into the pin fitting holes are arranged above and below the other flange portion, the pin fitting holes and the lock pins at two upper and lower positions are formed as square holes and square pins. Claw shaft attachment / detachment structure for rotary tiller. 5. A double-flange type pawl shaft is provided with tapered wedges at symmetrical positions on the outer surfaces of both flanges, and a female screw is formed in the center of the side end arc surface of the narrower side of the wedge surface. The female screw body is fixedly mounted, and the bite state is released by a push bolt screwed on the female screw body, the pawl shaft detaching structure of the rotary tiller.