JPH0440404Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a structure for attaching tilling claws for both forward and reverse rotation in a rotary tiller that can be switched between forward and reverse directions.

(Prior Art) A forward/reverse rotary tiller that can easily switch between up-cutting and down-cutting without attaching and detaching the tiller claws is disclosed in Japanese Utility Model Application No. 60-77305. In this prior art, the base of the tilling claw for forward and reverse rotation is inserted into a claw support fixed to a claw shaft that can be switched between forward and reverse directions, and the shaft of the support shaft having a shaft and a flange is connected to one of the claw supports. It penetrates through the tilling claw and is fixed to the other claw support, and a claw pressing member and a collar are fitted to the shaft portion between the flange portion and the tilling claw.

The support shaft is attached to the tilling claw and the claw support by fitting the claw pressure member and the collar at the site and inserting them into the tilling claw and the claw support while ensuring that they do not fall off.

(Problems to be Solved by the Invention) In the above-mentioned prior art, the claw pressure member and collar on the support shaft must be inserted into the tilling claw and the claw support while preventing them from falling off. The fitting of the pressure member and the collar is complicated, which makes the claw attachment work difficult.

(Means for Solving the Problems) The present invention forms a recess 36a on the outer peripheral surface of the shaft portion 36 of the support shaft 30 to prevent the collar 41 from rotating, and a stopper to prevent the collar 41 from coming off in the recess 36a. By providing a protruding member 52 and assembling the support shaft 30, pawl pressure member 42, and collar 41 as an assembly in advance, all of the problems of the prior art can be solved.

That is, the specific structure of the problem solving means of the present invention is characterized in that the base 23 of the tilling claw 22 for forward and reverse rotation is inserted into the claw supports 34 and 35 fixed to the claw shaft 20 that can be switched between forward and reverse directions. , the shaft part 36 of the support shaft 30 having a shaft part 36 and a flange part 38 is passed through one claw support 34 and the tilling claw 22 and fixed to the other claw support 35, and the flange part 38 is fixed to the other claw support 35. In the mounting structure of the tilling claw for both forward and reverse rotation, in which a claw pressing member 42 and a collar 41 are fitted to the shaft portion 36 between the tilling claw 22 and the tilling claw 22, an engaging portion is formed on the collar 41 on the outer peripheral surface of the shaft portion 36. Recessed portion 36a that engages with 41b to prevent rotation.
is formed, and engages with the engaging portion 41b of the collar 41 in the recess 36a to prevent the pawl pressing member 42 from the shaft portion 36.
and a stopper member 52 that prevents the collar 41 from coming off.
A protruding end 52a of this stopper member 52 is provided.
is located at a point located radially inward from the outer circumferential surface of the shaft portion 36.

(Function) The claw elastic member 42 is fitted to the shaft portion 36 of the support shaft 30, the collar 41 is fitted to the shaft portion 36 while the engaging portion 41b of the collar 41 is fitted to the recess 36a of the shaft portion 36, and then When the headed pin as the stopper member 52 is inserted into the hole 51 formed in the recess 36a, the head of the headed pin projects into the recess 36a, and its projecting end 52a engages with the engaging portion 41b of the collar 41. Together, the pawl pressure member 42 and the collar 41 are prevented from coming off the shaft portion 36, and the support shaft 3
It can be handled as an assembly in which the claw pressure member 42 and the collar 41 are incorporated in the 0, and the assembly can be passed through one claw support 34 and the tilling claw 22 on the claw shaft 20 and fixed to the other claw support 35. do.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 6 shows the overall configuration of the forward/reverse rotary tiller 1. This rotary tiller 1 is mainly composed of a machine frame 2, a tiller section 3, a tiller cover device 4, etc. It is mounted so that it can be raised and lowered via a point linkage mechanism.

The machine frame 2 has support arms 6 protruding from the left and right sides of a gear case 5 incorporating a forward and reverse gear transmission mechanism, and a transmission case 7 and a side frame 18 are fixed to the outer end of each support arm 6. ing. 8 is an input shaft protruding forward from the gear case 5; 9 is a transmission shaft that transmits the power of the input shaft 8 to the transmission case 7; 10 is a support frame extending rearward from the machine frame 2; It supports a gauge wheel 11, and its angle can be adjusted freely by a height adjustment mechanism 12.

The tillage cover device 4 includes a main cover 13 fixed to the machine frame 2, a rear cover 14 pivoted to the rear end of the main cover 13, and a pair of left and right side covers 15. Equal pressure adjustment mechanism 1
It is suspended by 6. Also, main cover 1
A comb-like Reiki 17 is attached to the rear end of the rear cover 3 so as to be adjustable in angle, and is located between the rear cover 14 and the tilling part 3 to prepare the tilled soil into a fine surface layer and a sub-layer soil clod.

The tilling section 3 includes a claw shaft 20 rotatably supported by the transmission case 7 and the side frame 18 about a horizontal axis, and a claw mounting body 21 fixed to the claw shaft 20.
The tiller shaft 20 has a large number of tilling claws 22 attached through the gear case 5, and the claw shaft 20 can be freely switched between forward and reverse directions by power from the gear case 5.

1 to 5, the tilling claw 22 is bent into a substantially rectangular shape when viewed from the front, as shown in FIG.
The blade portion 24 is formed into a flat plate shape, and the blade portion 24 is formed into a flat plate shape.
It is bent from the tip to form a scooping part 25,
The front and rear edges of the blade part 24 and the scooping part 25 are formed with blade parts 26a and 26b which are arcuate in side view, and the blade part 24 has a substantially circular or egg-shaped opening 27 in the center for soil removal.
is formed.

The mounting base 23 has a mounting hole 31 through which a support shaft 30 for pivotally supporting the claw mounting body 21 passes.
is formed, and contact surfaces 33 are formed on the front and rear sides of the proximal edge on the claw shaft 20 side. The abutting surface 33a is in the forward rotation working position A (down-cut tilling shown by the imaginary line in FIG. 6) when the tilling claw 22 is in the forward rotation working position A, and the contact surface 33b is in the reverse working position B (up-cutting tilling shown in the solid line in FIG. 6) when the tilling claw 22 is in the reverse working position B ), each of the claw shafts 20 comes into surface contact with a chevron-shaped stopper 28 fixed to the outer circumferential surface thereof to maintain each working posture.

The pawl attachment body 21 is a pair of pawl supports 3, which are two pieces welded to the outer periphery of the pawl shaft 13 so as to protrude radially outward.
4, 35, both claw supports 34, 35 are opposed to each other with an interval, and reinforcing ribs 34a, 3 are provided on the outer surface.
5a. The stopper 28 is located between the pawl supports 34 and 35, and can also be integrally molded with one of the pawl supports.

The support shaft 30 has a shaft portion 36 in the center, a male screw portion 37 with a smaller diameter than the shaft portion 36 on one end, and a flange portion 38 with a larger diameter on the other end. It passes through the hole 34b of the body 34 and the attachment hole 31 of the tilling claw 22, and its stepped portion 39 abuts the other claw support 35.
A nut 40 is screwed onto the male threaded portion 37 passing through the shaft 5b, thereby fixing the support shaft 30 to the claw support 35.

The flange portion 38 is formed with a pair of left and right flat portions 38a that come into contact with the reinforcing ribs 34a of the claw support 34, and the hole 34 of the claw support 34 is formed on the shaft portion 36 side.
A spigot part 38b is formed to be fitted into b.

Reference numeral 41 denotes a collar, and 42 a set of two claw pressing members made of disc springs, both of which are fitted onto the shaft portion 36,
2 and the flange portion 38. The tilling claws 22 are swingable around the support shaft 30 in the direction of rotation of the claw shaft, and the claw pressure member 42 is attached to the tilling claws 22.
is pressed against the other claw support 35 to provide frictional resistance against rocking. This frictional resistance is
2 is larger than the force that attempts to swing from each working position A and B to the neutral position due to centrifugal force, and is greater than the soil reaction force when the tilling claws 22 in one working position are reversed and driven into the soil. It is set small.

The collar 41 is for avoiding sliding contact between the swinging tilling claws 22 and the claw pressure member 42, and has an oval-shaped hole 41a formed in the center. Shaft portion 36
Two line-symmetrical flat surfaces are formed on the outer peripheral surface of the collar 41 so that the hole 41a of the collar 41 fits therein. This flat surface forms a recess 36a with respect to the outer peripheral surface, and a portion protruding radially inward of the hole 41a of the collar 41, that is, an arcuate engaging portion 41b (radially inward from the imaginary line in FIG. 2) engages. The rotation of the collar 41 is then stopped.

A hole 51 is formed in the recess 36a of the shaft portion 36, and a stopper member 52 made of a headed pin is provided in the recess 36a so as to be freely insertable and removable. This stopper member 52 is
1 may be a screw hole and screwed into the screw hole, and the pawl pressing member 42 is fitted to the shaft portion 36,
After fitting the collar 41 without fitting the engaging portion 41b to the collar 6a, the stopper member 52 is inserted into the hole 51 on the outside of the axis of the collar 41, so that the head of the stopper member 52 becomes the protrusion 52a. The collar 41 is engaged with the engaging portion 41b in the axial direction to prevent the collar 41 from coming off from the shaft portion 36. The state shown in FIG. 3 is a state in which the claw pressure member 42 and the collar 41 are assembled into the support shaft 30, and can be handled as one assembly.

The assembly formed in this way is inserted into the hole 34b from the outside of the claw support 34, the shaft portion 36 is passed through the attachment hole 31 of the tilling claw 22, and the claw support 3 is inserted into the hole 34b.
A nut 40 is screwed onto the threaded portion 37 from the outside of the nut 5 . In this assembled state, the stopper member 52 is located within the mounting hole 31, so the amount of protrusion of the protruding end 52a is shallower than the depth of the recess 36a.
The tip thereof is located radially inward from the outer circumferential surface of the shaft portion 36.

Note that the present invention is not limited to the above-mentioned embodiment. For example, the recess 36a and the engaging portion 41b are
The cross section of the recess 36a may be formed into a groove shape, and the stopper member 52 may be formed by driving a taper pin into the hole 51.

(Effect of the invention) According to the invention described in detail above, the engaging portion 4 formed in the collar 41 on the outer peripheral surface of the shaft portion 36 of the support shaft 30
A recess 36a that engages with the collar 41 to prevent rotation is formed, and an engaging portion 41b of the collar 41 is inserted into the recess 36a.
A stopper member 52 that engages with the shaft portion 36 to prevent the pawl pressing member 42 and the collar 41 from being removed from the shaft portion 36 is provided in a protruding manner. Therefore, the pawl pressure member 42 and the collar 41 can be assembled on the support shaft 30 to prevent them from coming off, and since it is an assembly, it is easy to handle, penetrate the pawl support 34 and the tilling pawl 22, attach it, etc. This makes it extremely easy to install and replace the tilling claws 22, etc.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a cross-sectional front view, Figure 2 being an exploded perspective view of the main parts,
Figure 3 is a partially sectional front view of the support shaft assembly;
Figure 4 is a side view of the support shaft, Figure 5 is the V-
FIG. 6 is a sectional side view of the forward/reverse switching rotary tiller. 1... Rotary tiller, 20... Claw shaft, 21...
...Claw mounting body, 22...Tilling claw, 23...Mounting base, 30...Support shaft, 34...Claw support, 35...
...Claw support, 36...shaft, 36a...recess, 3
7...Male thread part, 38...Flange part, 41...
Collar, 41a...hole, 41b...engaging portion, 42
... Claw pressing member, 44 ... Annular projection, 47 ...
Hole, 52...Stopper member, 52a...Protruding end.

Claims (1)

[Claims for Utility Model Registration] A claw support 3 fixed to a claw shaft 20 that can be switched between forward and reverse directions.
4, 35, and insert the base 23 of the tilling claw 22 for forward and reverse rotation, and pass the shaft portion 36 of the support shaft 30, which has a shaft portion 36 and a flange portion 38, through one of the claw supports 34 and the tilling claw 22. In the mounting structure of a tilling claw for both forward and reverse rotation, the claw is fixed to the other claw support 35, and a claw pressing member 42 and a collar 41 are fitted to the shaft portion 36 between the flange portion 38 and the tilling claw 22. , a recess 36a on the outer peripheral surface of the shaft portion 36 that engages with an engaging portion 41b formed on the collar 41 to prevent rotation;
is formed, and engages with the engaging portion 41b of the collar 41 in the recess 36a to prevent the pawl pressing member 42 from the shaft portion 36.
and a stopper member 52 that prevents the cover 41 from coming off.
A protruding end 52a of this stopper member 52 is provided.
is a mounting structure for a tiller claw that can be used for both forward and reverse rotation, and is located radially inward from the outer circumferential surface of the shaft portion 36.