JPS6239608Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for a forward-reverse tilling claw, and aims to prevent damage such as breakage of the mounting bolt that attaches the tilling claw to the claw shaft.

Some rotary tillage devices are capable of performing both down-cutting (forward rotation) and up-cutting (reverse rotation) operations, allowing the tilling operation to be performed in accordance with the type of crops to be planted or field conditions. By the way, in the above-mentioned tillage device,
In order to avoid troublesome work such as replacing the tiller claws when changing tasks, a dual-purpose tiller claw is sometimes provided. By the way, conventionally,
As shown in Utility Model Publication No. 41-1925, etc.
Because the tilling claws for both forward and reverse use were fixed to the claw shaft,
Since the driving angle of the cutting edge of the tilling claw cannot be adjusted and the driving angle is too large, a considerable impact force acts on the mounting base of the tilling claw, resulting in early damage. Therefore, in order to eliminate this drawback, a pair of brackets protruding radially outward are provided on the claw shaft in a manner facing each other in the direction of the claw axis, and the mounting base of the tilling claw is inserted between both brackets. By inserting the mounting bolt into the mounting base, the tilling claws can be set in a forward tilted position in which the tip is in a backward position in the forward direction from the mounting base, and in a reverse tilted position in which the tip is in a backward position in the reverse rotation direction from the mounting base. It is conceivable to provide the tiller with the ability to change its position, and in this way, the driving angle of the tiller claws can be made appropriate in both forward and reverse directions. However, if the mounting bolts are simply inserted into both brackets and the mounting base of the tilling claw as described above, large shearing stress will be generated on the mounting bolt due to the driving reaction force acting on the tilling claw. There is a risk of damage such as breakage to the mounting bolts.

The present invention has solved the above problem, and its feature is that the claw shaft is provided with a pair of brackets that protrude radially outward and are opposed to each other in the axial direction of the claw shaft. By inserting the mounting base of the tilling claw between them and inserting the mounting bolt into both brackets and the mounting base, the tilling claw can be placed in a normal rotation inclined position in which the tip is in a backward position in the normal rotation direction than the mounting base;
In a device that is capable of changing the posture between a reverse tilted position in which the tip is in a backward position in the reverse direction from the mounting base, a collar through which a mounting bolt is inserted is inserted into both brackets and the mounting base, and the bracket on the collar tip side is inserted into both brackets and the mounting base. The fitting hole into which the collar is inserted is formed into a stepped shape having a stepped surface halfway in the axial direction, and the stepped surface is opposed to the collar tip surface in the axial direction.

Hereinafter, one embodiment of the present invention will be described based on the drawings of FIGS. 1 to 7. In FIG. It is attached freely. The tilling device 1 includes a machine frame 3, a tilling section 4, a tilling cover device 5, a gauge device 6, and the like.

The machine frame 3 consists of an input gear case 7, a pair of left and right support arms 8 protruding from both sides of the input gear case 7, a transmission case 9 and a side plate 10, etc. installed below from the outer end of each arm 8. A provided input shaft 11 is operatively connected to a PTO shaft of the tractor. The gear case 7 has an input shaft 1
A forward/reverse switching mechanism interlocked with 1 is built in, and this mechanism is interlocked with the tilling section 4 via a transmission mechanism within a transmission case 9.

The tillage cover device 5 includes a fixed main cover 12,
It consists of a rear cover 13 that is bendably connected to the main cover 12 and covers the tilling section 4. The rear cover 13 is urged in the direction of contact with the ground via the bullet lowering mechanism 14, and on the inner surface of the rear cover 13,
A rake device 15 located on the rear side of the tilling section 4 is pivotally supported at the upper end thereof, and can be freely adjusted forward and backward with respect to the tilling section 4.

The tilling section 4 includes a transmission case 9 and a side plate 1.
a claw shaft 16 whose both ends are supported by the claw shaft 16;
It consists of a large number of forward and reverse tilling claws 18 attached via claw attachment bodies 17 fixedly attached to the tiller, and can be driven forward and reverse around the horizontal axis.

As shown in FIGS. 2 to 5, the claw mounting body 1
7 consists of a pair of brackets 19, 20 and an engaging body 21, which are welded to the pawl shaft 16. Both brackets 19 and 20 project outward in the radial direction of the pawl shaft 16 and are opposed to each other in the axial direction of the pawl shaft 16. In this case, a pair of flanges 22 and 23 are respectively formed that project outward in the axial direction of the claw shaft 16, and each bracket 19 and 20
A corresponding large-diameter fitting hole 24 or stepped fitting hole 25 is provided between the flanges 22 and 23 of the claw shaft 1, respectively.
6 in the axial direction. The stepped fitting hole 25 has a smaller diameter than the large-diameter fitting hole 24, and consists of a large-diameter fitting portion 25a on the other bracket 19 side, that is, on the inside, and a bolt hole 25b on the outside. The engaging body 21 is constructed between the bases of both the brackets 19 and 20, and has a mountain shape that projects outward in the radial direction of the claw shaft 16, and has a tip on the outer peripheral surface thereof.
A pair of engaging portions 26 and 27 are formed adjacent to each other in the circumferential direction of the pawl shaft 16.

The tilling claw 18 has a shape in which a pair of machete claws are integrated with peak parts 28 and 29 facing each other, and has a mounting base 3 inserted between both brackets 19 and 20.
0 and a blade portion 31. The mounting base 30 has fitting holes 24 and 25 for both brackets 19 and 20.
An insertion hole 32 corresponding to the hole 32 is formed therethrough. 3
4 is a collar with a flange 34a that is removably inserted into both the fitting holes 24, 25 and the insertion hole 32;
is fitted into the large diameter fitting hole 24, and the collar body 34b
is the fitting part 25 of the insertion hole 32 and the stepped fitting hole 25
It is fitted in a. 35 is a mounting bolt, and the mounting bolt 35 is connected to the collar 34 and the stepped fitting hole 25.
The tilling claw 18 is inserted into the bolt hole 25b in a removable manner, and the nut 36 is removably screwed onto the tip of the tilling claw 18.
It is rotatably mounted around the axis of the The stepped surface of the stepped fitting hole 25 and the tip end surface of the collar 34 are in contact with each other or face each other with a small gap in the axial direction. Note that when installing the tilling claws 18, the nut 36 is attached to the flange 23 of the bracket 20.
It is fitted in between and is prevented from rotating, and the mounting bolt 35 is screwed in this state. 37 is a spring washer. As described above, the collar 34 is inserted into both the brackets 19, 20 and the mounting base 30,
Since the mounting bolt 35 is inserted through the collar 34, the driving reaction force applied to the tilling claw 18 does not act on the mounting bolt 35, and the mounting bolt 35
There is no risk of breakage or other damage. Mounting base 3
The proximal end surface of 0 is shaped like a mountain protruding outward,
A pair of engaged parts 38, 39 are formed corresponding to the respective engaging parts 26, 27, and each engaged part 38, 39
By engaging and abutting the corresponding engaging portions 26 and 27, the tip of the tilling claw 18 shown by the imaginary line in FIG. A forward tilted posture in which the tip shown by the solid line in FIG. It is designed to be able to be held in each direction, and to be able to resist the driving reaction force of the tilling claws 18, both during down cut (forward rotation) work and during up cut (reverse rotation) work. Also color 34
Between the collar 34a and the mounting base 30, a bullet 40, which is exemplified by a disc spring that is removably fitted to the main body of the collar 34, is interposed in a spring shape, and the bullet of the bullet 40 is inserted. The frictional force generated by the force is the resistance force against the rotation of the tilling claws 8, and due to the above frictional force,
During each of the above-mentioned operations, when the tilling claws 18 come out of the soil, the tilling claws 18 are prevented from being turned into an intermediate position among the above-mentioned positions due to rotation due to centrifugal force accompanying the rotation. The above-mentioned frictional force is adjusted to be smaller than the driving reaction force against the soil when the tilling claws 18 rotate forward and backward, and as the direction of rotation of the claw shaft 16 changes from forward rotation to reverse rotation or vice versa, Cultivating claw 18
The posture can be freely changed from a normal tilted posture to a reverse tilted posture or vice versa, depending on the driving reaction force.
Further, the above-mentioned frictional force is adjusted by tightening the mounting bolt 35 to the nut 36. The blade portion 31 is bent at the tip side, and has a bent portion 42 on the tip side via a bent portion 41, and a portion extending from the base to the tip on both side edges of the blade portion 31 has an outwardly curved protrusion. A pair of blade edge portions 43 and 44 for forward rotation and reverse rotation are respectively formed in the shape of a shape, and the ridge portions 28 and 2 are formed at the widthwise central portion of the blade portion 31.
An opening 45 surrounded by 9 is formed.

As shown in FIGS. 6 and 7, the rake device 15 includes a first rake body 52 and a second rake body 5.
3, which are disposed at the rear end of the main cover 12 in the front and back. Both rake bodies 52, 53 include mounting bases 54, 55 placed on the upper surface of the main cover 12, and rake rods 5 arranged in multiple rows on the mounting boards 54, 55.
The upper end of each rake rod 56, 57 is welded to the mounting board 54, 55. Each of the rake rods 56 and 57 is removably inserted into the insertion hole 58 of the main cover 12 from above, and each mounting board 54 and 55 and the bolt hole 5 of the main cover 12
The bolts 6, 6 are inserted through the bolts 9, 60, and the bolts 61, 62 are screwed into nuts 63, 64 fixed to the back surface of the main cover 12, so that both rake bodies 52, 53 are attached to the main cover. It is detachably attached to 12. As mentioned above, both rake bodies 52, 53
The first rake body 52 can be easily attached and detached.
The space between the rake rods 56 is located in front of the center of the adjacent rake rods 57 of the second rake body 53, and therefore, the interval between the rake rods 56, 57 can be adjusted by attaching and detaching the rake bodies 52, 53.

8 to 10 show another example of the rake device, in which the main cover 12 is hollow, and both first and second rake bodies 52, 53 are located inside the main cover 12 as shown by the imaginary line in FIG. It can be stored as shown. Both rake bodies 52 and 53 are formed by connecting a large number of rake rods 56 and 57 with horizontal rods 65 and 66. Both rake bodies 5
The right and left outer rake rods 56, 57 of No. 2, 53 are longer than the others, and the upwardly projecting portions thereof are used as operation levers 67, 68. Operation lever 6
7 and 68 project upward through guide grooves 69 and 70 formed in the front and back direction on the upper plate of the main cover 12, and the operation levers 67 and 68 have fixed plates that project laterally. 71, 72 are fixedly installed, and bolts 61, 62 are inserted through the fixing plates 71, 72.
However, the nut 63 fixed on the back side of the main cover 12,
By being removably screwed to the rake rods 56, 57, each rake body 52, 53 is fixed at an appropriate moving position relative to the main cover 12.
It is possible to easily adjust the spacing, etc.

As detailed above, the present invention has a collar through which a mounting bolt is inserted, which is inserted into both brackets for attaching a forward/reverse type tilling claw and the mounting base of the tilling claw, so that it acts on the tilling claw. The driving reaction force and the like will not act on the mounting bolt, and there is no risk of damage such as breakage to the mounting bolt. In addition, since the collar end surface is opposed to the stepped surface of the stepped collar fitting hole in one of the brackets in the axial direction, fastening with the mounting bolt can be performed in the same manner as in the conventional method. The present invention has the above advantages and is of great practical benefit.

[Brief explanation of the drawing]

1 to 7 show an embodiment of the present invention,
Fig. 1 is an overall side view, Fig. 2 is a longitudinal sectional view of the tilling section, Fig. 3 is a front view of the same part, Fig. 4 is a longitudinal sectional view of the main part, Fig. 5 is a front sectional view of the same, Fig. 6 is a perspective view of the main cover and rake device, Fig. 7 is a vertical sectional view of the same part, Fig. 8 is a partial side view of the rotary tilling device, Fig. 9 is a perspective view of the main cover and rake device,
FIG. 10 is a rear sectional view of the same part. 1... Rotary tillage device, 17... Claw attachment body,
18... Forward/reverse dual-use tilling claw, 19, 20... Bracket, 30... Mounting base, 34... Collar,
35...Mounting bolt.

Claims (1)

[Scope of utility model registration request] A pair of brackets protruding outward in the radial direction are provided on the claw shaft so as to face each other in the axial direction of the claw shaft, and the mounting base of the tilling claw is inserted between both brackets, and the mounting bolts are inserted into both brackets and the mounting base. By inserting the tiller, it is possible to change the posture of the tilling claw between a forward tilted position where the tip is behind the mounting base in the forward rotation direction and a reverse tilted position where the tip is behind the mounting base in the reverse direction. A collar into which the mounting bolt is inserted is inserted into both brackets and the mounting base, and a fitting hole into which the collar is inserted in the bracket on the tip side of the collar is provided with a stepped surface halfway in the axial direction. 1. A mounting structure for a forward/reverse tilling claw, characterized in that it is formed in a stepped shape, and the stepped surface is opposed to the tip end surface of the collar in the axial direction.