JPH0119601Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tilling section structure of a forward/reverse rotary.

A rotary tiller towed behind a tractor has a tiller section consisting of a claw shaft installed horizontally in the left-right direction and a plurality of rows of claws arranged on the claw shaft, and the rotation of the tiller section allows it to spread the field. It is something to cultivate.

The direction of rotation of this tiller is divided into forward rotation (down cut) in which the claw shaft rotates in the same direction as the rotation direction of the drive wheel of the tractor being pulled, and reverse rotation (up cut) in which the claw shaft rotates in the opposite direction to the drive wheel. It is used differently depending on the purpose of use.

In the forward/reverse rotation rotary, the direction of rotation of the pawl shaft must be switched by a forward/reverse switching device, and the direction in which the pawls are attached must be reversed, making the job of replacing the pawls very troublesome.

Therefore, a claw has been devised in which blades are provided on both front and rear edges of the claw so that the claw can be used in either forward or reverse directions without having to be replaced. However, the angle at which the nail hits the ground (the angle between the tangent of the blade and the ground when the nail touches the ground)
There is an optimum value, and according to this value, the claw is tilted backward in the direction of rotation. Therefore, in order to maintain this optimum value so that it can be used for both forward and reverse purposes,
This resulted in very wide, spade-mark-shaped claws, which increased tillage resistance, making it difficult to put them into practical use.

By the way, Japanese Patent Publication No. 10970/1983 discloses a device in which the pawl is swingably supported and the width of the pawl is narrow so that it can be used in both forward and reverse directions.

However, this conventional type is a rotary soil crushing blade and not a tiller. In the case of a crushing blade, the resistance is relatively small, so a simple pivot structure for the swinging claw is sufficient. However, in the case of tilling claws, the tilling resistance is extremely large, so a simple structure cannot withstand use.

Therefore, it is conceivable to use a cylindrical bracket as the claw attachment part and to pivot the claw thereon so that the claw can swing freely, but in that case, it is necessary to consider how to regulate the swinging angle of the claw, as well as how to prevent soil from inside the bracket. There were problems such as the possibility that the shaft could become clogged and become unable to swing.

Therefore, the present invention was devised in view of the above-mentioned problems, and maintains the optimum driving angle by swinging the claws with respect to the claw axis without changing the claws in forward and reverse rotations, and also provides a method for swinging the claws. It is an object of the present invention to provide a tilling section structure of a forward/reverse rotary rotary that can prevent soil clogging in the moving section and allow smooth rocking of the moving section. Therefore, the feature is that in the tilling section of the rotary, which has claws protruding in the radial direction on the claw shafts installed laterally in the left-right direction, the claw shafts are provided so as to be freely driven in the forward and reverse directions. is,
The claw mounting portion 15 is formed in a flat cylindrical shape with an open end side, and the base portion 24 of the claw 6 is inserted into the mounting portion 15 through the opening. , the claw 6 has blade parts 22, 22 on the front and rear edges in the rotation direction, and the claw 6 has its base 24 so that the leading blade part 22 in the rotation direction of the claw 6 is in a trailing inclined position during forward and reverse rotation. is pivotally supported on the claw mounting portion 15 via the claw pivot portion 35, and the claw base portion 24 and the claw pivot portion 35 of the claw mounting portion 15 are
The front and rear sides engage with each other to form a stopper part 36 that maintains the tilted posture, and the stopper part 36 closes the opening of the claw attachment part 15.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows an outline of a forward/reverse rotary rotary 1 employing the present invention, and the rotary 1 is attached to the rear of a tractor 3 via a three-point linkage mechanism 2 to be towed. A tilling section 4 is provided at the lower part of the rotary 1, and the tilling section 4 has a claw shaft 5 installed horizontally in the left-right direction.
and a large number of pawls 6 provided on this pawl shaft 5 in a radially outwardly protruding manner. The upper part of the tilling section 4 is covered with a front cover 7, a main cover 8 and a rear cover 9. A power receiving gear box 10 is provided on the upper part of the rotary 1, and power is transmitted from the gear box 10 to the pawl shaft 5 via a side drive device 11. This gearbox 11 includes a power transmission shaft 1
Power is transmitted from the PTO shaft 13 of the tractor 1 via 2. Further, the gearbox 10 is provided with a forward/reverse switching device, and the claw shaft 5 is rotated in both forward and reverse directions by the switching device.

Here, forward rotation (down cut) means that the tractor 3
The rear wheel 14 of the rotary wheel 1 rotates in the direction of arrow a.
When the wheel moves in the direction of arrow F, the pawl shaft 5 rotates in the direction of arrow b (same direction as the rear wheel), and reversal means that the rear wheel 14 rotates in the direction of arrow a and the pawl shaft 5 rotates in the direction of arrow b (same direction as the rear wheel). 5 rotates in the direction of arrow c.

FIGS. 2 to 4 show details of the tilling section 4, and are examples of the present invention. A large number of pawl mounting portions 15 are arranged on the pawl shaft 5 and protrude radially outward. The pawl attachment portion 15 consists of a pair of brackets 16 and 17 that face each other in the left-right direction, and a parallel gap 18 is provided between the brackets 16 and 17, into which the pawl 6 is loosely fitted. One bracket 1
6 has a bolt insertion hole 19 parallel to the pawl axis in the center in the front-rear direction, and the other bracket 17 has a sleeve insertion hole 2 coaxial with the insertion hole 19.
0 is provided throughout. At both front and rear ends of one bracket 16, there are flanges 2 that close the gap 18.
1 and 21 are provided halfway up. The height of the flanges 21, 21 is lower than the bolt insertion hole 19.

The claw 6 has blade portions 22, 22 on the front and rear edges in the rotation direction, and the blade portions 22, 22 are formed into a curved shape.
The tip of the claw 6 is cut off perpendicularly to the center line 23 of the claw, and the base 24 of the claw is provided with a protrusion 25 that fits loosely into the gap 18 surrounded by the flanges 21, 21. The edges are shaped like equilateral chevrons. An oval hole 26 is formed in the center of the claw 6. A sleeve through hole 27 is formed on the center line 23 of the claw base 24. The tip of the claw 6 is formed into a bent portion 28 that is perpendicular to the center line of the claw and curved in one direction in the left-right direction. Thus, the claws 6 are formed symmetrically with respect to the center line 23.

The sleeve through hole 27 of the pawl 6 is connected to the pawl mounting portion 1.
The protrusion 25 of the claw base 24 is inserted into the gap 18 between the brackets 16 and 17 so as to be aligned with the sleeve insertion hole 20 of No. 5, and the flanged sleeve 29 is inserted through the holes 20 and 27, A bolt 30 is inserted through 29 so as to protrude from the bolt insertion hole 19, and a nut 31 is screwed into the protrusion.
Note that a disc spring 33 is interposed between the flange portion 32 of the sleeve 29 and the side surface of the claw 6. The nut 31 is fitted into a T-slot 34 recessed in the end face of the bracket 16 and cannot be rotated relative to the other. By tightening the bolt 30, the pivot portion 35 is constructed, and the claw 6
is resiliently biased by a disc spring 33 and pivotably supported by brackets 16 and 17. The tightening force of the disk spring 33 is such that the claw 6 is
Although it does not rotate due to centrifugal force, the strength is adjusted so that it can rotate depending on the force with which the claw 6 collides with the ground.

However, the swinging range of the pawl 6 is restricted by the contact between the chevron-shaped apex at the tip of the projection 25 of the pawl base 24 and the flange 21 of the bracket 16.
and the pawl attachment portion 15 constitute a stopper portion 36.

Next, the effects of the above embodiment of the present invention will be explained. When the pawl 6 rotates forward (in the direction of arrow b), the pawl 6
collides with the ground 37 in the field, so that the blade 22 on the leading side in the rotational direction swings into a trailing inclined position, as shown by the imaginary line in FIG. The tilted posture is maintained by a stopper portion 36 consisting of. In this inclined position, the curve of the blade portion 22 is determined so that the driving angle θ between the tangent 38 of the blade portion 22 and the ground 37 is an optimum value. Further, while the claw 6 is separated from the ground 37 and idles, the claw 6 is elastically supported by the disk spring 33 so as not to swing due to centrifugal force, so that the claw 6 does not rattle. Therefore, the claws 6 exhibit the same tillage effect as ordinary hatchet claws.

Next, when it is reversed, it will be in an inclined position as shown by the solid line in FIG. This reversal of the forward and reverse tilted postures is automatically performed when the claws 6 collide with the ground 37. That is, the tightening force of the disc spring 33 is adjusted to a strength that allows the claw 6 to swing against the ground impact force. This reverse tilted posture
6, the flange 21 of the bracket 16 and the claw base 24
It is maintained by contact with. Moreover, flange 21
By contacting the claw base 24 with the bracket 16,
The gaps 18 between the gaps 17 are closed, and the gaps 18 are not clogged with soil.

Note that the hollow hole 26 in the center of the claw 6 has the effect of preventing clogging of tilled soil.

According to the above embodiment, even if the claw 6 is double-edged, the driving angle θ can be maintained at the optimum condition even if the width is narrowed because the claw 6 swings. Since the width of the claws 16 is narrow, tilling resistance does not increase.

Furthermore, the stopper portion 36 prevents dirt from entering the gap 18 of the bracket, allowing the claw to swing smoothly.

Note that the present invention is not limited to the above embodiments.

According to the present invention, there is no need to replace the claws in forward and reverse rotations, and the forward and reverse postures are automatically obtained, thereby improving work efficiency. Since the claws swing, the width of the claws can be narrowed, so tillage resistance does not increase. In addition, in forward and reverse rotation, dirt does not get stuck in the pivot part of the claw, making the swinging motion smoother, which has great practical effects.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is a partially sectional side view, Fig. 2 is a side view of the main part of the first embodiment, Fig. 3 is a sectional view, and Fig. 4 is a sectional view taken along the line shown in Fig. 3. It is a diagram. 4... Cultivating part, 5... Claw shaft, 6... Claw, 15...
...Claw attachment part, 22...Blade part, 24...Base, 25
... Central branch, 36... Stoppers section.

Claims (1)

[Scope of utility model registration request] In a rotary tilling section 4 having a pawl 6 provided in a radially outwardly protruding form of a pawl shaft 5 horizontally installed in the left-right direction, the pawl shaft 5 is provided so as to be freely driven in forward and reverse directions,
The claw mounting portion 15 is formed into a flat cylindrical shape with an opening at the protruding tip side, and the base 24 of the claw 6 is inserted through the opening.
is inserted into the mounting portion 15, and the pawl 6 has blade portions 22, 22 on the front and rear edges in the rotation direction, and the pawl 6 has blade portions 22 on the leading side in the rotation direction of the pawl 6 in a backward inclined position during forward and reverse rotation. The base 24 is connected to the claw pivot support 35 so that
The pawl base 24 and the pawl pivot portion 35 of the pawl attachment portion 15 are pivotally supported to the pawl attachment portion 15 via
The forward and reverse rotary rotary is characterized in that the front and rear sides engage with each other to form a stopper part 36 that maintains the inclined posture, and the opening of the pawl attachment part 15 is closed by the stopper part 36. tillage structure.