JPH0433685Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for attaching a tilling claw for both forward and reverse rotation of a rotary tiller.

In rotary tillage, working machines have been proposed that can be used for up-cutting (reverse rotation) and down-cutting (forward rotation) operations depending on the type of crops to be planted or field conditions. These forward/reverse rotary tillers require replacing the tiller claws or reversing the direction in which the rotary tiller is attached to the tractor during forward and reverse rotation, which is extremely complicated.

Therefore, without replacing the tiller claws or changing the mounting direction of the tiller, you can simply switch between forward and reverse in the power transmission mechanism.
A forward/reverse rotary tiller has been proposed for use in forward/reverse work. In such a tiller, the tilling claws are swingably supported on the claw shaft, and the angle at which the tilling claws are attached can be changed between forward rotation and reverse rotation.

However, since large forces and impact forces act on the tiller claws, the pivot structure that allows them to swing freely in order to withstand these forces is extremely complex and expensive.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a structure for attaching a tilling claw for both forward and reverse use, which has a simple structure and is strong. Therefore, the feature is that a pair of left and right brackets having a U-shaped cross section have a U-shaped concave portion facing outward on the claw axis that can be switched forward and reverse around the horizontal horizontal axis, and the tilling claws While loosely fitting the
One bracket has a bolt thread insertion hole parallel to the axis of the claw shaft, and a counterbore hole concentric with the insertion hole is provided at the inner end of the insertion hole. An oval-shaped bolt neck insertion hole with a large diameter and concentric with the counterbore hole is provided in the other bracket, and a pawl pivot bolt is inserted through both insertion holes, and the bolt is inserted into the other bracket. consists of a threaded part that is inserted into the threaded part insertion hole and protrudes outward, a claw pivot part that fits into the counterbore hole, an oval neck part that is fitted into the outer end of the neck insertion hole, and a recessed part. The bolt has a head that locks on the end face, and the bolt is fixed to the bracket by screwing a nut into the threaded part, and the tilling claw located between the brackets is rotatable on the pivot of the claw. At the same time, a disc spring is interposed between the neck and the pawl in the neck insertion hole, and the base of the tilling pawl is brought into contact to hold the tilling pawl in a forward rotation or reverse rotation working position. A stopper is provided between the brackets.

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

In FIG. 1, reference numeral 1 denotes a forward/reverse rotary tiller, which is attached to a tractor (not shown) via a three-point linkage mechanism 2 so as to be able to rise and fall freely.

The rotary tiller 1 includes a machine frame 3, a tiller section 4,
It mainly consists of a tillage cover device 5 and the like.

A power receiving case 6 is provided in the center of the machine frame 3, support arms 7 are provided on the left and right sides of the case 6, a transmission case 8 is fixed to one end of the arm 7, and a support plate 9 is fixed to the other end. ing. One support arm 7 has a power receiving case 6 and a transmission case 8.
A transmission shaft 10 that interlocks and connects the transmission mechanisms is inserted.

A power receiving shaft 11 is protruded forward from the power receiving case 6, and the power of the PTO shaft of the tractor is transmitted to the shaft 11, and the transmission mechanism in the transmission case 8 is transmitted through the forward/reverse switching mechanism built into the case 6. can be linked.

A bracket 12 is provided protruding forward from a midway portion of the support arm 7, and a lower link 13 of the three-point linkage mechanism 2 is pivotally connected to the tip of the bracket 12. The gauge shaft 14 is attached to this bracket 12.
The height is adjustable.

The tillage cover device 5 includes a main cover 15 fixed to the machine frame 3, a front cover 16 consisting of a rubber sag attached to the front edge of the main cover 15, and a front cover 16 that is attached to the rear edge of the main cover 15. It consists of a rear cover 18 which is refractably connected via a pivot support fitting 17,
Each covers the cultivation section 4. The rear cover 18 is urged in the direction of contact with the ground via an elastic support mechanism 19, and the front cover 16 can be freely changed in angle by a lifting device (not shown), as shown by solid lines and imaginary lines in FIG. be.

As shown in FIG. 2, the front cover 16 is provided with a notch 20 so as not to interfere with the gauge wheel 14 when lifted upward. Notch 20
A U-shaped fitting 21 is attached to the periphery of the holder. When the front cover 16 is lifted, this metal fitting 21
The gauge wheel 14 is in sliding contact with the outer peripheral surface of the gauge wheel 14.
It acts as a scraper.

In this way, since the notch 20 is provided in the front cover 16 and configured so as not to interfere with the gauge wheel 14, the gauge wheel 14 can be brought closer to the tilling section 4 side, and conversely, this makes it possible to move the gauge wheel 14 closer to the tilling section 4 side. This means that the tiller 1 can be mounted close to the tractor side, and by bringing the tiller 1 close to the tractor side, the weight balance of the tractor is improved. Further, since the front cover 16 is also used as a scraper for the gauge wheel 14, a separate scraper part is not required, and the number of parts can be reduced.

The tilling section 4 has a pawl shaft 22 which is supported at one end by the transmission case 8 and by the other end by the support plate 9 via a bearing device so as to be rotatable around a horizontal horizontal axis.
is capable of forward and reverse rotation via the transmission mechanism.

The claw shaft 22 has a pair of left and right brackets 23,
A large number of tilling claws 24 are erected, and a tilling claw 25 is rotatably supported between the brackets 23 and 24.
The mounting angle is configured to be changeable during forward rotation in the direction of arrow a in the figure and reverse rotation in the direction of arrow b. That is, the tilling claws 25 are provided with blades on both sides in the direction of rotation, and are used for both forward and reverse rotation.

The mounting structure of the tilling claws 25 is shown in FIGS. 3 to 7. In these drawings, the left and right pair of brackets 23 and 24 have a U-shaped cross section, and the U-shaped recesses 26 face outward, and are opposed to each other with a gap in which the tilling claws 25 are loosely fitted. The claw shaft 22 is erected and fixed on the outer peripheral surface of the claw shaft 22. A chevron-shaped stopper 27 is integrally formed at the base of one of the brackets 23 so as to be located within the gap. The slope of this stopper 27 engages with the sloped surface of the base of the tilling claw 25 to regulate the attachment angle of the tilling claw 25.

That is, a stopper 27 is provided between the brackets 23 and 24, with which the base of the tilling claw 25 comes into contact in order to hold the tilling claw 25 in a forward or reverse working position.

One bracket 23 is provided with a bolt thread insertion hole 28 having an axis parallel to the axis of the pawl shaft 22. A large diameter counterbore hole 29 concentric with the insertion hole 28 is provided on the inner end side of the insertion hole 28 .

The other bracket 24 has the counterbore hole 29.
A bolt neck insertion hole 30 having a large diameter and concentric with the bolt neck is provided. This neck insertion hole 30 is formed in an oval shape, and its minor axis length is equal to the width of the recess 26. A locking groove 31 extending along the axial direction is recessed in a portion of the inner circumferential surface of the neck insertion hole 30 near the pawl shaft 22 side.

A pawl support bolt 32 is inserted into both the insertion holes 28 and 30 in a penetrating manner. The bolt 32 includes a threaded portion 33 that is inserted into the threaded portion insertion hole 28 and projects outward, a pawl pivot portion 34 that connects to the threaded portion 33 and fits into the counterbore hole 29, and a claw pivot portion 34 that is connected to the threaded portion 33 and fits into the counterbore hole 29. It integrally includes an oval neck 35 that is connected and fitted into the outer end of the neck insertion hole 30, and a head 36 that is connected to the neck 35 and is locked to the end surface of the recess 26. The head 36 is also formed into an oval shape so as to fit inside the recess 25.

The bolt 32 is fixed to one of the brackets 23 with a nut 37 screwed onto a protruding threaded portion 33, and an end of the claw pivot portion 34 supported in a counterbore hole 29 in a tight fit manner. End neck 35
is supported in the neck insertion hole 30. The head 36 prevents the brackets 23 and 24 from separating.
The fitting between the oval-shaped neck 35 and the neck insertion hole 30 and the engagement between the oval-shaped head 36 and the side wall surface of the recess 26 prevent the bolt 32 from rotating.

The tilling claw 25 inserted between the brackets 23 and 24 is pivotally supported with a bolt claw pivot portion 34 inserted into the bolt insertion hole 38 thereof so as to be relatively rotatable. A disc spring 39 is interposed in the pawl pivot portion 34 of the bolt 32 to elastically restrict the swinging of the tilling pawl 25. This disc spring 39 is
A pivot portion 34 between the washer 40 and the neck 35 located in the neck insertion hole 30 and provided on the tilling claw side.
This provides frictional resistance to the swinging of the tilling claws 25.

The washer 40 fitted onto the claw pivot support 34 is formed into an oval shape and is prevented from rotating relative to the neck insertion hole 30. Further, the washer 40 is provided with a locking tongue 41, and relative rotation is prevented through engagement between the tongue 41 and the locking groove 31.

According to the embodiment of the present invention having the above structure, the nut 37 and the bolt head 36 are fitted into the recesses 26 of the pair of brackets 23 and 24, so that collisions of soil and stones with them are prevented and damage to them is prevented. Prevented. The bolt 32 is prevented from relative rotation by the engagement between the oval-shaped insertion hole 30 and the neck 35 or the engagement between the head 36 and the side wall of the recess 26.
7 can be tightened easily and reliably. bolt 32
Since both ends are supported by the counterbored hole 29 and the neck insertion hole 30, the tilling claw 25 can be firmly pivoted without being bent and deformed, and since it is not bent and deformed, the tilling claw 25 can swing smoothly. shall be. Further, both brackets 23 and 24 have a head 36 and a threaded portion 33.
Since separation is prevented by the nut 37 screwed onto the brackets 23 and 24, there is no possibility that the gap between the two brackets 23 and 24 will widen, thereby preventing damage to the brackets.

Even if the distance between the brackets 23 and 24 widens due to overload force, the washer 40 is prevented from relative rotation by the locking tongue 41.
As the tilling claws 25 swing, the space rotates and spreads.
I never get into it. Therefore, there is no possibility that the swinging of the tilling claws 25 will be hindered due to the washer 40 being twisted.

In this way, according to the above embodiment, the tilling claws 25 can be reliably and firmly supported with an extremely simple structure.

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

According to the present invention, it is possible to reliably and firmly support the tilling claws in a swingable manner with a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of a forward/reverse rotary tiller, Fig. 2 is a view taken in the direction of the arrows in Fig. 1, Fig. 3 is a front view showing a tilling claw attachment structure showing an embodiment of the present invention; Figure 4 is a view taken along the - arrow in Figure 3, Figure 5 is a cross-sectional view taken along the - line in Figure 3, and Figure 6 is a - arrow view in Figure 4.
7 is a sectional view taken along the - line in FIG. 8. 22...Claw shaft, 23, 24...Bracket, 2
5... Cultivating claw, 26... Recess, 28... Threaded portion insertion hole, 29... Spot facing hole, 30... Neck insertion hole,
32... Bolt, 33... Threaded portion, 34... Claw pivot, 35... Neck, 36... Head, 39... Disc spring.

Claims (1)

[Scope of utility model registration request] A pair of left and right brackets 2 with a U-shaped cross section
3 and 24 stand facing each other with a U-shaped recess 26 facing outward and a gap in which the tilling claw 25 is loosely fitted on the claw shaft 22 which can be switched forward and reverse around the horizontal horizontal axis. One bracket 23 has a bolt thread insertion hole 28 parallel to the axis of the pawl shaft, and a counterbore hole 29 concentric with the insertion hole is provided at the inner end of the insertion hole.
is recessed in the other bracket 24, and an oval-shaped bolt neck insertion hole 30 with a large diameter and concentric with the counterbore hole is opened in the other bracket 24. 32 is inserted, and the bolt has a threaded portion 33 that is inserted into the threaded portion insertion hole and projects outward, and a pawl pivot portion 34 that fits into the counterbored hole.
The bolt integrally has an oval neck part 35 that is fitted into the outer end of the neck insertion hole, and a head part 36 that is engaged with the end surface of the recessed part, and the bolt has a nut 37 screwed into the threaded part. A tilling claw 25 fixed to the bracket 23 and located between the brackets is rotatably supported on the claw pivot portion, and a disc spring 39 is attached to the claw pivot portion between the neck and the claw in the neck insertion hole. A stopper 27 is interposed between the brackets 23 and 24, and a stopper 27 is provided between the brackets 23 and 24, and the base of the tilling claw 25 comes into contact to hold the tilling claw 25 in a forward or reverse working position. Mounting structure for dual-purpose reversing tillage claws.