JPH0458286B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a method for attaching claws to a tilling and mowing device, and more specifically to a tilling and mowing device in which a single rotary working machine can perform tilling work when the rotary shaft rotates in the forward direction, and mowing work when the rotary shaft rotates in the reverse direction. The present invention relates to a method for attaching a pawl to a tilling and mowing device, in which the pawl, which is attached so as to be swingable in the rotational direction via a pawl attachment portion of a rotary shaft, can be securely fixed during tilling.

[Conventional technology]

Some rotary work machines have rotary shafts that can rotate in forward and reverse directions.
As is clear from Publication No. 73104, a claw with blade edges formed on the outer periphery of both forward and reverse rotations is attached to a rotary shaft that can rotate in forward and reverse directions via a claw attachment part so that it can swing in the direction of rotation. What has been done is known. By rotating the rotary shaft in the forward direction, tilling, crushing, and soil crushing using the so-called downcut method
By rotating the rotary shaft in the opposite direction, it is possible to carry out tasks such as plowing, and by rotating the rotary shaft in the opposite direction, tilling and crushing, which is known as the up-cutting method, can be carried out with a single rotary work machine.

[Problems to be solved by the invention]

However, the above-mentioned conventional rotary work machine has the advantage that it can perform two methods of tilling and crushing, so-called up-cutting and down-cutting, by simply rotating the rotary shaft in the forward and reverse directions. The only work involved was plowing, and it was not possible to cut tall weeds or the like before plowing, for example. In other words, the rotation speed of the rotary shaft in conventional rotary work machines is set to suit tasks such as tilling, crushing soil, or plowing (e.g. 200 to 300 rpm), and the high rotation speed required for mowing work (e.g. 800 rpm). ) is not possible. In addition, the pawl attached to the pawl attachment part of the rotary shaft can swing freely depending on the rotation method of the rotary axis, and when performing tillage work by rotating the rotary axis in the forward direction, the pawl attached to the pawl attachment part is attached to the stopper. Although a predetermined cutting angle is maintained by bringing the nails into contact, there is also a problem in that the lateral play of the nails cannot be sufficiently suppressed.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and provides a rotary work machine in which the rotation of the rotary shaft is set to a rotation speed suitable for tilling work when rotating in the forward direction, and a high rotation speed suitable for mowing work when rotating in the reverse direction. At the same time, the pawl attached to the pawl attachment part of the rotary shaft is securely fixed at a position with a predetermined cutting angle suitable for tilling work when rotating in the forward direction, and swings in the direction of rotation when rotating in the reverse direction. It is free to move and is held in place by centrifugal force.
It is an object of the present invention to provide a method for attaching claws to a tilling and mowing device that allows stable tilling and mowing operations to be performed with one rotary working machine.

[Means to solve the problem]

In order to achieve the above object, according to the present invention,
The rotary shaft is set to rotate at a speed suitable for tilling work when rotating in the forward direction, and at a high speed suitable for mowing work when rotating in the reverse direction. Reverse rotation The mounting holes for the claws, which have blade edges formed on both outer peripheries, are set eccentrically to the tilling side by a predetermined distance from the center line passing through the radius center of the arcuate base of the claws and the center of gravity of the claws. In the rotary working machine, the pawl is pivotally supported on the pawl mounting portion of the rotary shaft so as to be able to swing freely in the rotational direction, and the lateral play is suppressed through the leaf spring and the pawl seat, and when the rotary shaft is tilling, It is characterized in that it is mounted so as to come into contact with a stopper that maintains a predetermined cutting angle.

[Effect]

Based on the above configuration, according to the method of attaching the claws in the tilling and mowing device of the present invention, the claws attached to the rotary shaft have a shape that combines both tilling and mowing functions, When performing tillage work, the rotary shaft rotates at a low speed suitable for the tillage work, and the pawl, which is pivotally supported on the pawl attachment part of the rotary shaft, rotates in the direction that receives the reaction force to maintain a predetermined cutting angle. The position of the pawl is regulated by the stopper, and when the pawl is stopped from rotating, the side surface of the pawl is held by a leaf spring or the like, thereby suppressing lateral wobbling. In addition, when mowing work is performed by rotating the rotary shaft in the opposite direction, the rotary shaft rotates at a high speed suitable for mowing work, and the claws pivotally supported on the claw attachment part rotate away from the stopper, causing a constant rotation due to centrifugal force. It stops at a certain position. Therefore, by selecting the forward or reverse rotation direction of the rotary shaft, the rotary shaft will rotate at a speed suitable for tilling or mowing work, and the position of the claws will also be automatically adjusted depending on the direction of rotation of the rotary shaft. settings, allowing the desired work to be carried out smoothly and stably.

【Example】

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a schematic configuration diagram of the main parts showing the power transmission mechanism of the tilling and mowing device according to the present invention, Fig. 2 a and b
is a side view of the claw attachment part showing the rotary shaft in Fig. 1, Fig. 3 is a side view of the main part showing the tilling state by the rotary work machine of the present invention, and Fig. 4 is a side view of the main part showing the mowing state. 5A and 5B are a front view and a side view of a claw according to the present invention, and in the figures, a rotary working machine designated by reference numeral 1 is raised and lowered via a three-point link hitch mechanism at the rear of an agricultural tractor (not shown). It can be mounted freely, and a gearbox 2 is provided in the center of the fuselage. This gearbox 2
is provided with an input shaft 3 protruding forward,
It is connected to the tractor's PTO shaft via a transmission shaft, universal joint, etc., and the driving force is transmitted. A bevel gear 4 is attached to the tip of the input shaft 3, and meshes with a bevel gear 6 attached to the end of the intermediate shaft 5. Gears 7 and 8 are fixed to the intermediate shaft 5, and the gear 7 has a forward rotation gear 9 with a large reduction ratio.
Further, a reverse rotation gear 11 is always meshed with the gear 8 via an intermediate gear 10, and the normal rotation gear 9 and the reverse rotation gear 11 are attached to a transmission shaft 12 so as to be freely rotatable at all times. Then, the forward rotation gear 9 and the reverse rotation gear 1
A sliding gear 13 is attached between the transmission shaft 12 and the transmission shaft 12 by means of a spline or the like, and is capable of rotating and sliding integrally with the transmission shaft 12. The rotational force on the reverse rotation side is transmitted to the transmission shaft 12. The transmission shaft 12 extends through the transmission frame into a chain case 15 provided at one side end of the machine body, and connects to a sprocket 16 inside the chain case 15 and a support frame attached to the opposite end of the chain case 15. A chain 20 is stretched between the sprocket of a rotary shaft 18 mounted on the lower part of the rotary shaft 17, and driving force for forward or reverse rotation is selectively transmitted to the rotary shaft 18. . On the other hand, as shown in FIGS. 2a and 2b, a pawl attachment portion 21 is fixed to the rotary shaft 18 at a predetermined interval in the length direction.
The claws 23 are rectangular and extend symmetrically in a direction perpendicular to the rotary shaft 18, and a pawl 23 is pivotally supported at the outer end via a pivot pin or bolt 22 so as to be swingable in the direction of rotation. As shown in FIGS. 5a and 5b, the claw 23 has a horizontal blade part 23b formed by bending the distal end from the vertical blade part 23a to one side in an L-shape. A blade edge 23c is formed on the side edge of the portion 23b in both forward and reverse rotation directions. Further, the pawl 23 has a mounting hole 23d formed therein, and is pivotally supported by the pawl mounting portion 21 via a bolt 22. Further, the pawl mounting portion 21 to which the pawl 23 is attached has a stopper 2 that comes into contact with the side surface of the base of the pawl 23 to restrict rotation of the pawl 23 when the rotary shaft 18 rotates in the forward rotation (solid line) direction.
4, when the rotary shaft 18 rotates in the opposite direction (in the direction of the dotted line), the pawl 23 separates from the stopper 24, rotates around the pivot bolt 22, and centrifugal force causes the center of gravity G to remain at a fixed position. It is becoming more and more maintained. Here, in the above configuration, when the rotary shaft 18 is reversely rotated for mowing work with the claw 23 attached to the claw attachment part 21, the claw 23 becomes rotatable by the pivot bolt 22 and centrifuged. It stays in place due to force, but when it is rotated in the forward direction for tilling work, the rotation speed is low and the torque applied to the claws 23 fluctuates widely, and furthermore, the tillage performance of the claws 23, such as reversing and mulching the soil, is It must be securely fixed with a certain cutting angle δ. Therefore, when the pawl 23 is in contact with the stopper 24 that receives a reaction force in the rotational direction, the pivot bolt 22 that slidably attaches the pawl 23 is used to prevent the pawl 23 from playing in the lateral direction. As shown in FIGS. 2a and 2b, the leaf spring 25 and the pawl seat 26 are fastened together. One end of the claw seat 26 is connected to the rotary shaft 18
The plate spring 25 is in contact with the outer peripheral surface of the plate spring 25 and prevented from rotating by welding or the like, and the tip of the leaf spring 25 is in contact with the stopper 24 and is prevented from rotating.
4, the side surface of the claw 23 is in contact with the leaf spring 25.
It is pressed and fixed to the claw attachment part 21 via. Further, the rotary working machine 1 equipped with the rotary shaft 18 is provided with covers 27 and 28 suitable for the work at the front and rear parts. Furthermore, in order to facilitate the mowing work using the claws 23, as shown in FIG. Because they are shifted, the back surface m of the bent portion of the claw 23 is aligned with the normal n in the direction of centrifugal force.
A cutting angle α is formed with respect to the angle α. Therefore, the bent rear surface m of the claw 23 can reduce the escape of the blade without coming into contact with irregularities on the ground surface or stones, and can prevent uncut leaves. Since it rotates around the pivot bolt 22 during work and mowing work, it forms an arc with a radius R centered on point P, and the attachment hole 23d of the claw 23 passes through the center of gravity G.
It is eccentric to the tilling side from point P on the center line L of. FIGS. 6 to 10 are explanatory diagrams of main parts showing a claw attachment part according to another embodiment of the present invention,
What is shown in FIG. 6 is the claw mounting part 21 and the claw seat 26.
In order to prevent the pawl seat 26 from opening laterally when the pawl 23 is swingably attached via a pivot bolt 22 between the The claw 23 is installed in the mounting hole 23d of 23.
A collar 29 that is slightly thicker than the thickness of the collar 29 is inserted, and the one shown in FIG.
The pawl 23 rotated toward the tilling side comes into contact with the tapered surface of the pawl seat 26 to eliminate lateral play. In addition, in the case shown in FIGS. 8a and 8b, the pawl 23 is fixed to the pawl mounting portion 21 by a pivot bolt 22 via a disc spring 30, and a protrusion is provided in advance at a predetermined position of the pawl 23. 23e engages with the hole 21a protruding from the pawl attachment portion 21 when the rotary shaft 18 is rotated in the forward direction, thereby suppressing lateral play. In the case shown in FIGS. 9a and 9b, protrusions 23f and 26a are respectively formed on the opposing surfaces of the claw 23 and the claw seat 26 which are fastened together with the pivot bolt 22, and when the claw 23 is rotated to the tilling position. The protrusions 23f and 26a abut against each other and are locked, and the protrusions 23f and 26a suppress the lateral play that occurs between the claw 23 and the claw attachment portion 21. Furthermore, FIG. 10 is a side view of a claw attachment part showing another embodiment according to the present invention, in which the swing center of the claw 23 and the center point P of a circular arc surface with a radius R formed at the base of the claw 23. is eccentric by amm, and rotary shaft 1
8 rotates forward and the pawl 23 comes into contact with the stopper 24, a leaf spring 31 presses against the arcuate surface of the pawl 23.
One end is fixed to a bracket 32 provided on the claw attachment part 21. Therefore, rotary shaft 1
When the blade 8 rotates in the opposite direction and the claw 23 rotates to the mowing state due to centrifugal force, it will receive a reaction force from the leaf spring 31. Next, a description will be given of a method of attaching the claws to the tilling and mowing device configured as described above. First, when driving force is input to the input shaft 3 from the PTO shaft of the tractor, the intermediate shaft 5 rotates, and when the shift lever 14 is operated to the forward rotation side and the rotary shaft 18 is rotated forward, the pawl 23 is rotated. In a state where the claw mounting portion 21 comes into contact with the stopper 24 and its rotation is restricted, the field can be tilled in the same manner as the well-known tilling claws. At this time, the reverse gear 11 is passed through the intermediate gear 10.
is idling on the transmission shaft 12, and the sliding gear 13 meshes with the normal rotation gear 9 that meshes with the gear 7, and the transmission shaft 1
2, the chain 20 stretched between the sprocket 16 and the sprocket 19 of the rotary shaft 18 rotates the rotary shaft 18 at a predetermined number of rotations. Next, when the shift lever 14 is operated to the reverse side and the rotary shaft 18 is rotated in the reverse direction, the pawl 23 rotates around the pivot bolt 22 and becomes a free state, and is stopped in a fixed position by centrifugal force and weeds. etc. can be harvested in the same way as conventional flail blades and mower blades. Note that when performing tillage work by rotating the rotary shaft 18 in the forward direction, with the claws 23 in contact with the stopper 24 of the claw attachment part 21, the side surfaces of the claws 23 are held between the leaf springs 25 or the disc springs 30, and Directional wobble is suppressed.

【Effect of the invention】

As explained in detail above, according to the present invention,
The rotary shaft of the rotary work machine is configured to be able to rotate at high speed suitable for mowing work when rotating in reverse, and
The shape of the claws is adapted for tilling work when rotating in the forward direction, and mowing work when rotating in the reverse direction.
The rotary work machine on the stand can perform the work of two machines, plowing and mowing, and the work can be switched with a single touch by operating the shift lever, so the work machine can be attached to the work machine. Labor and time for replacement etc. are greatly reduced, making it efficient and economical. In addition, when tilling work is performed by rotating the rotary shaft in the forward direction as in the present invention, the claws come into contact with the stopper of the claw attachment part, and the claw seats are also tightened together via the pivot bolts that attach the claws. The side surfaces of the claws are suppressed by the leaf springs, etc., and lateral play is eliminated.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of the main parts showing the power transmission mechanism of the tilling and mowing device according to the present invention, Fig. 2 a and b
1 is a side view of the claw attachment part showing the rotary shaft in FIG. 1, FIG. 3 is a side view of the main part showing the tilling state by the rotary working machine of the present invention, and FIG. 4 is a side view of the main part showing the mowing state. Figures 5a and 5b are front and side views of the claw according to the invention, and Figures 6 to 1.
FIG. 0 is an explanatory view showing the main parts of a claw attachment part that is another embodiment of the present invention. 1...Rotary work machine, 2...Gearbox,
3...Input shaft, 4...Bevel gear, 5...Intermediate shaft, 6
...Bevel gear, 7, 8...Gear, 9...Normal rotation gear,
10...Intermediate gear, 11...Reverse gear, 12...
Transmission shaft, 13... Sliding gear, 14... Shift lever, 15... Chain case, 16... Sprocket, 17... Support frame, 18... Rotary shaft, 19... Sprocket, 20... Chain,
21...Claw attachment part, 21a...Hole, 22...Pivot bolt, 23...Claw, 23a...Vertical blade part, 23
b...Side blade portion, 23c...Blade edge, 23d...Mounting hole, 23e...Protrusion, 23f...Protrusion, 24
... Stopper, 25 ... Leaf spring, 26 ... Claw seat,
26a...Protrusion, 27, 28...Cover, 29
...Color, 30...Disc spring, 31...Plate spring,
32... Bracket, P... Arc center point, O...
Center point of mounting hole, R... Radius of the base of the claw, α... Cutting angle.

Claims (1)

[Claims] 1 The rotation of the rotary shaft is set to a rotation speed suitable for tilling work when rotating in the forward direction, and a high rotation speed suitable for mowing work when rotating in the reverse direction, and is attached via the claw attachment part of the rotary shaft, and The mounting holes of the claws, which have blade edges formed on both outer peripheries of forward and reverse rotation, are set eccentrically to the tilling side by a predetermined distance from the center line passing through the radius center of the arcuate base of the claws and the center of gravity of the claws. In this rotary work machine, the pawl is pivotally supported on the pawl mounting portion of the rotary shaft so as to be able to swing freely in the rotational direction, and the lateral play is suppressed through the leaf spring and the pawl seat, and when the rotary shaft is tilled, A method for attaching a claw to a tilling and mowing device, characterized in that the claw is bonded so as to come into contact with a stopper that maintains a predetermined cutting angle.