JPH0433684Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a mounting structure for a tiller claw for both forward and reverse use.

(Prior art) There are two types of rotary tillage methods: an up-cut method and a down-cut method, and the so-called forward-reverse rotary method, which uses both methods as appropriate depending on the type of crops to be planted or field conditions, has already been developed since 1977-1925. It is proposed in the publication No. Kono Jiko Showa 41-1925
It is proposed in the publication No. This actual public school 41-
In the rotary disclosed in Publication No. 1925, the mounting arm of the tilling claw, which has blades on both sides in the direction of rotation, is fixed to the claw mounting bracket of the claw shaft, which can be rotated forward or backward, with bolts, etc., so that the claw shaft can be rotated in the forward or reverse direction. By doing so, a common tiller can be used for both up-cutting and down-cutting.

(The problem that the invention aims to solve) However, since the tilling claws are fixed, the driving angle is too large in both forward and reverse directions, resulting in high tilling resistance and frequent damage to the attachment part. .

Therefore, the tilling claws are mounted so that their posture can be changed freely using the pivot of the claw mounting bracket or other appropriate means, so that the tip side of the tilling claws is on the rear side in the direction of rotation than the base side, depending on the direction of rotation of the claw shaft. It has been considered to use the tiller by changing the posture of the tiller. In this case, since the tilling claws take an inclined position, the driving angle of the blade part on the front side in the direction of rotation relative to the field can be reduced, and since the blades can be driven sequentially from the base side to the tip side, the tilling resistance is significantly reduced. There is.
Another possible option is to have the tiller claws semi-fixedly pivoted on a claw mounting bracket, and use the driving resistance when the tiller claws are driven into the field to automatically change the attitude of the tiller claws. ing.

(Means for Solving the Problems) The present invention aims to prevent damage to the claw mounting bracket for semi-fixedly mounting the above-mentioned tilling claws and improve durability. A claw mounting bracket 15 provided on a claw shaft 14
The mounting base 20 of the forward/reverse tilling claw 16 is inserted between the left and right pair of bracket bodies 23 and 24, and the collar body 27 is fitted into the fitting hole 29 formed in one of the bracket bodies 23. A bullet 47 is interposed between 27 and the mounting base 20, and the collar body 27 is connected to the mounting base 20.
The mounting base 20 is pressed in the direction of the other bracket body 24 via the bullet 47, and in this pressed state, the tilling claws 16 are tilted forward in accordance with the direction of rotation of the claw shaft 14. A fitting flange 27a which is pivotally supported so that the posture can be changed between a posture 21 and a reverse tilted posture 22, and in which the flange body 27 is fitted into a fitting hole 29 of the bracket body 23; A fitting flange 27b is provided which extends outward from 27a and comes into contact with or approaches the outer surface of the peripheral edge of the fitting hole 29 of the bracket body 23 so as to be able to come and go.

(Embodiment and operation) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In Figs. 1 to 5, 1 is a rotary tiller for forward and reverse rotation; It is attached to a tractor via a three-point linkage mechanism 2 so that it can be moved up and down.

The rotary tiller 1 is mainly composed of a machine frame 3, a tiller section 4, a tiller cover device 5, etc. In this example, the machine frame 3 has arm bodies 7 protruding from the left and right sides of a power receiving case 6, A transmission case 8 is located at one end.
A support plate (not shown) is fixed to the other end.

A power receiving shaft 9 is projected forward from the power receiving case 6, and power from a tractor PTO shaft (not shown) can be coupled to the shaft 9, and a forward/reverse switching mechanism (not shown) built into the case 6 is connected to the power receiving shaft 9. Interlocking is possible via a transmission mechanism, for example, a wrapped transmission body, within the transmission case 8.

The tilling cover device 5 includes a fixed main cover 10 and a rear cover 12 which is bendably connected to the cover 10 via a joint fitting 11, and covers the tilling section 4.

Note that the rear cover 12 is held biased in the direction of contact with the ground via an elastic support mechanism 13.

The tilling section 4 is made up of a claw shaft 14 and a large number of tilling claws 16 for both forward and reverse rotation, which are attached via claw mounting brackets 15 fixed to the claw shaft 14, and in this example,
One shaft end of the pawl shaft 14 is supported by the transmission case 8 through a bearing device (not shown), and the other shaft end is supported by a support plate through the bearing device so as to be rotatable around a horizontal horizontal axis.
It can be freely rotated in forward and reverse directions via the transmission mechanism and the like.

In addition, in FIG. 1, 17 indicates a gauge wheel mechanism, 18 indicates a rake mechanism, and the rake mechanism 18
is made up of a plurality of rake rods arranged in a row in the lateral direction, and is attached to the cover device 5 on the rear side of the tilling section 4 in this example.

The tilling claw 16 is attached to the claw shaft 14, which can be freely switched between forward and reverse directions, through the claw mounting bracket 15, and its tip 1
9 is in a normal rotation inclined position 21 in which the position is backward in the forward rotation direction than the mounting base 20, and the tip 19 is in a forward rotation direction backward position than the mounting base 20.
Reverse tilted posture 22 that is in a backward position in the reverse direction than
They are each attached so that they can be held.

The pawl mounting bracket 15 is welded to the pawl shaft 14, as shown in FIGS. 2 to 5.
A pair of left and right bracket bodies 23 facing each other so as to sandwich the mounting base 20 of the tilling claw 16 from the axial direction,
24, and each bracket body 23, 24 has a claw shaft 1.
It has flanges 25 and 26 that protrude outward from each other in the axial direction of the pawl shaft 14 at the front and rear in the circumferential direction, and one bracket body 23 has a fitting hole 29 of a cylindrical collar 28 with a flange 27 (flange body) for the pawl. A mounting bolt 3 opened in the axial direction of the shaft 14 and whose hole center coincides with the fitting hole 29.
0 (attachment member) insertion hole 31 is opened in the other bracket body 24. and the fitting hole 29
As shown in FIG. 4, it is formed in a stepped shape having an inner small-diameter fitting hole 29a with a smaller diameter and an outer large-diameter fitting hole 29b with a larger diameter,
On the other hand, the collar 27 of the tube collar 28 has a small diameter fitting hole 29a.
A small diameter flange 27a (fitting flange portion) and a large diameter flange 27 are removably fitted in correspondence with the large diameter fitting hole 29b.
b (engaging flange).

The tilling claw 16 has a tube collar 28 on its mounting base 20.
An insertion support hole 32 is formed, and the mounting base 20 is inserted between the bracket bodies 23 and 24, and the cylindrical collar 28
The claw shaft 14 is inserted into the fitting hole 29 and the insertion hole 32, respectively.
It is inserted and fitted from the axial direction, and is attached via the attachment bolt 30 and nut 33 so as to be rotatable around the axis of the attachment bolt 30.

The tilling claw 16 has a blade portion 34 extending from the mounting base 20 to the tip 19, and has a blade edge portion 35 at the front and rear of the blade portion 34, respectively.
Further, the tip 19 is formed with a rake face 38 via a bent part 37, and the root edge of the mounting base 20 is formed into a so-called chevron shape, and engaged parts 39 and 40 for the claw shaft 14 are respectively formed. It is formed.

Further, engagement portions 41 and 42 each having a so-called chevron shape are formed at the root portions between the bracket bodies 23 and 24, and are pivotally supported on the claw shaft 14 side so as to be rotatable around the axis of the mounting bolt 30. When the tilling claw 16 is in the normal rotation tilted posture 21, the engaged portion 39 on the trailing side in the forward rotation direction is engaged with the corresponding engaging portion 41, and the tilling claw 16 is in the reverse rotation tilted posture 22. , the engaged portion 40 on the trailing side in the reverse rotation direction is engaged with the corresponding engaging portion 42 and can be held at each position, so that even when up cut (reverse rotation), down cut (normal rotation) Even when the reaction force
It is arranged to face F ₁ and F ₂ .

Here, the engaged portion 39 and the engaging portion 41 are connected to the tilling claw 1.
6 is a means for holding a normal rotation tilted posture 21 in which the tip 19 of the mounting base 20 is in a backward position in the normal rotation direction,
The engaged portion 40 and the engaging portion 42 are the tip 1 of the tilling claw 16.
Reference numeral 9 denotes a means for holding the reverse tilted posture 22 which is in a backward position in the reverse direction relative to the mounting base 20, and in either posture, the angle formed by the blade portions 35 and 36 with the tilling locus curve, that is, the cutting angle γ is 0. 90 degrees, and the blade portions 35 and 36 are each curved in a direction opposite to the direction of rotation.

Thus, the tilling claws 16 can be regarded as a pair of so-called machete claws, with their ridges 43 and 44 sides abutted to form an integral shape, and the portion surrounded by the ridges 43 and 44 forms a hollow portion 45. This hollow portion 45 is used for removing soil that is sometimes dug between the adjacent tilling claws 15.

Note that the tilling claws 16 may have a shape that integrates a so-called L-shaped claw or a flower-shaped claw, and the hollow portion 45 may not be formed.

Whether the tiller claws 16 are up cut or down cut, the blade parts 35 and 36 are driven into the soil from the root part to the tip gradually, and the driving angle is held by the holding means, but it does not come out of the soil. When the mounting bolt 30 is used as a fulcrum, the centrifugal force accompanying the rotation rotates the forward rotation inclined position 21 and the reverse rotation inclined position 2.
2, but this can be prevented by resistance means 16 provided between the tilling claws 16 and the claw shafts 14.

As particularly illustrated in FIG. 4, the resistance means 46 of the first embodiment has an elastic force 47 shown by a disk spring in the fitting hole 29 of the tube collar 28 and the outer surface of the mounting base 20 and the collar 27.
A cylindrical collar 28 is fitted between the inner surfaces of the bracket body 24, and by adjusting or tightening the mounting bolt 30 and the nut 33, it is possible to apply a frictional force that overcomes the centrifugal force.
By engaging the anti-rotation fitting portion 48 formed on the outer surface of the nail, and tightening the head of the mounting bolt 30 with a tool, the frictional force that overcomes the centrifugal force can be adjusted from the direction of the axis of the nail. It is said to be adjustable. 4
9 is a spring washer.

In this state where the tilling claws 16 are attached,
The small diameter flange 27a and the large diameter flange 27b of the flange 27 of the tube collar 28 are connected to the small diameter fitting hole 29a and the large diameter fitting hole 29.
b, respectively, and the inner surface of the large-diameter collar 27b and the outer surface of the peripheral edge of the small-diameter fitting hole 29a are configured to be in contact with or very close to each other.

In addition, in this embodiment, a recess 50 is formed on the inner end surface of the bracket body 24 against which the insertion side end of the cylindrical collar 28 comes into contact.
is formed, and the insertion side end of the cylinder collar 28 is fitted into this, so the mounting bolt 3
No cutting (shearing) force is applied to the mounting bolt 3.
0 durability is improved.

Further, the elastic device 47 constituting the resistance means 46 may be a plurality of disc springs, or may be a so-called bamboo spring or a coil spring.

Furthermore, the resistance force of the resistance means 46, that is, the frictional force, is set and adjusted to be smaller than the driving reaction forces F ₁ and F ₂ of the tilling claws 16 in forward and reverse rotation, and here, the claw axis from forward rotation to reverse rotation 14, the tilling claws 16 can freely change their posture between a forward tilted posture 21 and a reverse tilted posture 22.

In the above embodiment, the operation will be explained when it is adopted in the tiller 1 having the rake mechanism 18.The direction of the arrow A in FIG.
6 is held in the reverse tilted position 22 with its tip in the rearward position in the reverse direction, and is driven into the soil to perform tilling work.

The soil cut by the blade part 36 of the tilling claw 16 is turned over by the rake face 38 and carried around along the inner surface of the tilling cover device 5, and the rake mechanism 18 performs a so-called soil particle sieving action to remove residual culm. is buried to form an upper layer of tillage that changes from large grains to small grains.

The driving into the soil is maintained by the holding means 40, 42, and the resistance means 46 prevents the tilling claws 16 from taking a swinging position due to the centrifugal force when they emerge from the soil.

On the other hand, in order to change from reverse rotation to forward rotation (down cut), the direction of rotation of the claw shaft 14 is reversed to the direction A, but due to the claw driving resistance caused by this, the tilling claws 16 are rotated around the mounting bolt 30 and held. Means 3
9 and 41, it is automatically switched to the normal rotation tilted posture 21.

And, even when doing this down cut, the tilling claw 1
6 is prevented from swinging in the radial direction due to centrifugal force.

As described above, even if the claw shaft 14 is rotated in either the forward rotation direction or the reverse rotation direction, the tilling claws 16 can be held in the forward rotation tilted posture 21 and the reverse rotation tilted posture 22, respectively, which are the rearward rotation direction positions. , allows optimal tilling work with low impact force.

Furthermore, since the tilling claws 16 are prevented from assuming an unstable rocking position between the forward and reverse tilted positions 21 and 22 due to centrifugal force by the resistance means 46, the tilling claws 16 can be operated even under low noise conditions. , guaranteeing stable tillage work.

Moreover, the resistance force of the resistance means 46 is the nail driving reaction force F ₁ ,
Since it is smaller than _F2 , it is possible to automatically switch between forward and reverse directions.

Furthermore, when the nail is driven in, as shown in FIG. receives a force in the direction of separating from the opposing bracket body 23, but the inner surface of the large diameter collar 27b of the cylindrical collar 28 attached by the mounting bolt 30 comes into contact with the outer surface of the peripheral edge of the small diameter fitting hole 29a. Alternatively, since they are very close to each other, the acting force is also received by the opposing bracket body 23 via the large diameter collar 27b of the cylinder collar 28, and therefore the acting force is absorbed by the single bracket body 24. Compared to the case where it is received, the acting force is received in a distributed manner by both the bracket bodies 23 and 24, so the strength against the acting force is increased,
Damage can be prevented. Therefore, durability can be improved.

FIG. 6 shows a second embodiment, in which the tube collar 2
The inner surface of the large-diameter collar 27b of No. 8 is in contact with or very close to the outer surface of the peripheral edge of the fitting hole 29, that is, the outer surface of the bracket body 23.

In each of the above embodiments, the so-called box-shaped claw mounting bracket 15 is shown, but the bracket bodies 23 and 24 may be constructed in the form of opposing flanges that are continuous in the circumferential direction of the claw shaft 14. .

(Effect of the invention) The present invention has a pair of left and right bracket bodies 2 of a pawl mounting bracket 15 provided on a pawl shaft 14 that can freely rotate forward and backward.
Mounting base 2 of the tilling claw 16 for forward and reverse use between 3 and 24
0 is inserted, the collar body 27 is fitted into the fitting hole 29 formed in one bracket body 23, and the collar body 2
A bullet 47 is interposed between the bracket 7 and the mounting base 20, and the collar body 27 is mounted in a pressed state in the direction of the mounting base 20, and the mounting base 20 is pressed in the direction of the other bracket body 24 via the bullet 47. , and in this pressed state, the tilling claws 16 are pivotally supported so as to be freely changeable between a forward tilting posture 21 and a reverse tilting posture 22 according to the rotational direction of the claw shaft 14, and the collar body 27 is a bracket body. A fitting flange 27a that is fitted into the fitting hole 29 of the bracket body 23 and a fitting flange 27a that is formed to project outwardly from the fitting flange 27a and that can freely come into contact with and separate from the outer surface of the periphery of the fitting hole 29 of the bracket body 23. A fitting flange portion 27b that comes into contact with or comes close to the bracket body 27b is provided, and the force is distributed to both the bracket bodies 23 and 24, compared to the case where only one bracket body receives the force. Therefore, the strength against acting force is increased, and damage to each bracket body can be prevented and durability can be improved. It also has the advantage of having a simple configuration and being easily manufactured.

[Brief explanation of drawings]

Figure 1 is a partially cutaway side view of the overall structure of the rotary tiller, Figure 2 is an enlarged view of the main parts of Figure 1, Figure 3 is a front view of Figure 2, and Figure 4 is a front view of Figure 3. cross section,
FIG. 5 is a side sectional view of FIG. 2, and FIG. 6 is a front sectional view of main parts showing another embodiment. 14...Claw shaft, 15...Claw mounting bracket, 1
6... Cultivating claw, 20... Mounting base, 21... Normal rotation tilted posture, 22... Reverse tilted posture, 23... Bracket body, 24... Bracket body, 27... Tsuba,
30...Mounting bolt, 47...Ammunition.

Claims (1)

[Scope of utility model registration request] The mounting base 20 of the tilling claw 16 for both forward and reverse rotation is inserted between the left and right pair of bracket bodies 23 and 24 of the claw mounting bracket 15 provided on the claw shaft 14 that can be rotated forward and backward, and the fitting base 20 of the tilling claw 16 for both forward and reverse use is inserted between the pair of bracket bodies 23 and 24 of the claw attachment bracket 15 provided on the claw shaft 14 that can freely rotate forward and backward. The collar body 27 is fitted into the hole 29, a bullet 47 is interposed between the collar body 27 and the mounting base 20, and the collar body 27 is mounted in a pressing manner toward the mounting base 20, and is mounted via the bullet 47. The base 20 is pressed in the direction of the other bracket body 24, and in this pressed state, the tilling claws 1
6 to normal rotation tilted posture 2 according to the rotation direction of the claw shaft 14
1 and a reverse tilted position 22, the collar body 27 is attached to the bracket body 2.
A fitting flange 27a that is fitted into the fitting hole 29 of No. 3, and a fitting flange 27a that is formed outwardly from the fitting flange 27a and projects outwardly, and that can freely come into contact with and separate from the outer surface of the periphery of the fitting hole 29 of the bracket body 23. A mounting structure for a tiller claw for both forward and reverse rotation, characterized in that it is provided with a fitting flange portion 27b that comes into contact with or comes close to.