JPH0458285B2 - - 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, tillage, crushing, and so-called down-cutting
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-cut method, can be carried out with a single rotary work machine.

[Problems to be solved by the invention]

However, the above-mentioned conventional rotary working machines have the advantage of being able to perform two methods of tilling and crushing, so-called up-cutting and down-cutting, simply by rotating the rotary shaft in the forward and reverse directions. The only work required was plowing, and it was not possible to cut tall weeds, etc., 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 is able to swing freely in the direction of the rotary axis, and when performing tillage work by rotating the rotary shaft in the forward direction, it hits the stopper provided on the pawl attachment part. Although the nails are brought into contact with each other to maintain a predetermined cutting angle, there is also the problem 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. The purpose of the present invention is to provide a method for attaching claws to a tilling and mowing device which is movable and held in place by centrifugal force, and which enables stable tilling and mowing operations to be performed with a single rotary working machine. That is. Another object of the present invention is that when the rotary shaft is rotated in the forward direction, the claws attached to the claw attachment portion of the rotary shaft can prevent the stopper, which is held at a predetermined cutting angle, from excessively cutting during tilling work. Consisting of shear bolts that cut against reaction force,
It is an object of the present invention to provide a method for attaching a claw in a tilling and mowing device, in which a plate spring for suppressing lateral play of the claw is fastened by the shear bolt.

[Means to solve the problem]

In order to achieve the above object, according to the present invention,
In a rotary working machine that can rotate forward and backward, the rotation of the rotary shaft is set so that when rotating in the forward direction, the rotation speed is suitable for tilling work, and when rotating in the reverse direction, the rotation speed is set at a high speed suitable for mowing work. The center of the mounting hole of the claw, which is attached through the mounting part and has blade edges formed on both outer peripheries of forward and reverse rotation, is set to be shifted a predetermined distance toward the tilling side from the center line passing through the center of gravity of the claw. , characterized in that, when the rotary shaft rotates to the tilling state, the reaction force of the claw is received by a stopper that is fastened together via a plate spring that clamps the side surface of the claw and a shear bolt. It is something to do.

[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 tillage work, and the claws, which are pivotally supported on the rotary shaft's claw attachment part, rotate in the direction that receives the reaction force and maintain a predetermined cutting angle. The position is regulated by the shear bolt, and both side surfaces of the pawl are held between the leaf spring and the pawl mounting portion, both of which are fastened together by the shear bolt, so that lateral play is suppressed. 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 pivoted to the claw attachment part move away from the stopper and can freely swing in the direction of rotation. It is stopped in a fixed position by centrifugal force. Therefore, by selecting the forward or reverse direction of rotation 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. It is possible to perform the desired work 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
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 work 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 a front view and a side view of a claw according to the present invention, and Figures 6a and b are a front view and a side view showing the main parts of a claw attachment part according to another embodiment of the present invention. Although not shown in the figure, a rotary working machine designated by the reference numeral 1 is attached to the rear of an agricultural tractor via a three-point link hitch mechanism so that it can be raised and lowered, and a gear box 2 is provided in the center of the machine. This gearbox 2 has
An input shaft 3 is provided so as to protrude forward and is connected to the PTO shaft of the tractor via a transmission shaft, a universal joint, etc., so that 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 is connected to a forward rotation gear 9 having a large reduction ratio, and the gear 8 is connected to a reverse rotation gear 1 via an intermediate gear 10.
1 are always in mesh with each other, 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. The forward rotation gear 9 and the reverse rotation gear 11
A sliding gear 13 is attached between the transmission shaft 12 and the transmission shaft 12 by means of splines, etc., so that it can rotate and slide integrally with the transmission shaft 12, and a shift lever 14 protruding from the gear box 2 can be used to rotate the gear in forward or reverse directions. The rotational force of the 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 fuselage, and is connected to a sprocket 16 in the chain case 15.
A chain 20 is disposed between the rotary shaft 18 and the sprocket of the rotary shaft 18 which is mounted on the lower part of the support frame 17 attached to the opposite end of the chain case 15.
is stretched, so that driving force for forward rotation or reverse rotation can be 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.
have a rectangular shape extending symmetrically in a direction orthogonal to the rotary shaft 18, and a pawl 23 is pivotally supported at the outer end of each via a pivot pin or bolt 22 so as to be swingable in the direction of rotation. There is. As shown in FIGS. 5a and 5b, the claw 23 has a tip end bent from the vertical blade part 23a to one side in an L-shape to form a horizontal blade part 23b. Blade part 23b
A blade edge 23c is formed on the side edge in both forward and reverse rotation directions. Furthermore, a mounting hole 23d is bored in the claw 23, and a bolt 22 is inserted into the claw mounting portion 23d.
It is supported by Further, the pawl mounting portion 21 to which the pawl 23 is attached is provided with a stopper 24 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. 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 holds the center of gravity G at a fixed position. It's becoming like that. Here, in the above configuration, when the rotary shaft 18 is reversely rotated for mowing work with the pawl 23 attached to the pawl attachment part 21, the pawl 23 becomes free from the pivot bolt 22 and is caused by centrifugal force. It stays in a fixed position, but when 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, due to the tilling performance of the claws 23, such as turning the soil over and mulching it, Depth angle δ
It must be securely fixed with
The sear bolt 25, which receives a reaction force in the rotation direction of the pawl 23, is designed to break before the pawl 23 breaks if an excessive reaction force is applied, and the horizontal play of the pawl 23 is caused by the shear bolt 25. It is held down by a leaf spring 26 that is tightened together. 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, the center point O of the mounting hole 23d is shifted by a mm from the center of gravity G on the center line L of the claws 23, as shown in FIG. 5b. , the rear surface m of the bent portion of the claw 23 has a cutting angle α with respect to the normal n in the direction of centrifugal force.
is formed. 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 shifted toward the tilling side from point P on the center line L of. FIGS. 6a and 6b are a front view and a side view of the main parts of a claw attachment part according to another embodiment of the present invention. The shear bolt 25 to be cut includes:
A disc spring 29 on the disk is tightened together. Unlike the plate spring 26, the disc spring 29 has no directionality, so there is no need to prevent it from rotating, and it is possible to suppress lateral play by holding the side surface of the pawl 23 from any direction. 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 26 or the disc springs 29, 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 a high speed suitable for mowing work when rotating in the reverse direction, and the shape of the claw is adapted for pooping work when rotating in the forward direction and mowing work when rotating in the reverse direction,
One rotary work machine can perform the work of two machines, plowing and mowing, and switching between these works can be done with a single touch by operating the shift lever, making it easier to use 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 shear bolts of the claw attachment part, and the side surfaces are clamped by the plate springs or disc springs that are fastened together with the shear bolts. This has the effect of suppressing lateral wobbling.

[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. 5A and 5B are a front view and a side view of a claw according to the present invention, and FIGS. 6A and 6B are a front view and a side view of a claw attachment part showing another embodiment according to 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, 22...Pivot bolt, 23
...Claw, 23a...Vertical blade part, 23b...Horizontal blade part,
23c...Blade edge, 23d...Mounting hole, 24...
Stopper, 25... Shear bolt, 26... Leaf spring, 27, 28... Cover, P... Arc center point, O... Mounting hole center point, R... Radius of base of claw, α... Cutting angle .

Claims (1)

[Claims] 1. In a rotary work machine that can rotate forward and reverse, set the rotation of the rotary shaft so that when rotating in the forward direction, the rotation speed is suitable for tilling work, and when rotating in the reverse direction, it is a high speed suitable for mowing work, and when rotating the rotary shaft, The center of the mounting hole of the claw, which is attached through the claw attachment part of the machine and has blade edges formed on the outer periphery of both forward and reverse rotations, is set by shifting it a predetermined distance toward the tilling side from the center line passing through the center of gravity of the claw. In addition, when the rotary shaft rotates to the tilling state, the reaction force of the claw is received by a stopper that is fastened together with a plate spring that clamps the side surface of the claw and a shear bolt. Features: How to attach claws to tilling and mowing equipment.