JPH0325524Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a protection device for a tilling cylinder shaft mounting bolt that attaches the tilling cylinder shaft to the drive shaft in a center drive type rotary tiller.

Generally, the tilling cylinder shaft fitted into the drive shaft of this type of center drive type rotary tilling unit is integrally attached and fixed to the drive shaft via a mounting bolt inserted from the outside of the tilling cylinder shaft. . Therefore, the bolt head of the mounting bolt protrudes outward from the outer end of the tilling cylinder shaft.

Therefore, when tilling work is carried out in a state where the tilling tube shaft is lower than the tilled soil surface, the protruding bolt head moves while rotating violently in the uncultivated soil, causing the bolt to The disadvantage is that the head wears out considerably, and when the hexagonal corners of the bolt head wear out and become rounded, the corners will no longer catch, so common tools such as spanners will not work. There was an inconvenience that the mounting bolts could not be removed. Therefore, in order to protect the bolt head, a cap is attached to the bolt head,
Attempts have been made to erect a cylindrical protective wall, but in the former case, when the cap is removed to install an extension shaft to widen the tillage width,
This is undesirable since the bolts for attaching the cap are often lost, making it impossible to attach the cap. On the other hand, the latter type does not have such drawbacks, but because the bolt head is located inside the protective wall, it is highly versatile as a spanner, etc., and is generally handed to users as an accessory tool for agricultural tractors, etc. Mounting bolts cannot be attached and detached using many tools, and special tools such as a box wrench are required, and the protective wall becomes clogged with mud, making it impossible to attach and detach the mounting bolts using a box wrench. There were drawbacks such as getting in the way and rusting of the bolt heads, so there were problems in any case.

The present invention was devised in order to eliminate these drawbacks in view of the above-mentioned actual situation, and it is possible to tighten the mounting bolts using a common tool such as a spanner without using a special tool such as a box wrench. It is an object of the present invention to provide a protection device for a tilling cylinder shaft mounting bolt that can be attached and detached and that can protect the bolt head of the mounting bolt from wear at the corner. This is what I did. In the present invention, in particular, a tilling cylinder shaft is fitted into the outer end of a center drive type drive shaft, and a mounting bolt is inserted from the outside of the tilling cylinder shaft through a square flange plate. In a tilling device in which a tilling tube shaft is attached to a drive shaft, a protector having a 〓 shape when viewed from the rear is provided on the outside of the flange plate, and has a protective protrusion and a rotation prevention protrusion bent in opposite directions. The protector is configured to be mounted with the mounting bolt through a bolt insertion hole provided in the middle part of the protector, and the rotary trajectory surrounds the bolt head of the mounting bolt when the tilling cylinder shaft rotates. It is characterized by the fact that it has been provided.

Next, the present invention will be explained in more detail based on an embodiment shown in the drawings. In the drawings, reference numeral 1 denotes a traveling body of an agricultural tractor, and a rotary tiller 2 is attached to the rear side of the traveling body 1 so as to be movable up and down. The drive shaft 3 of the rotary tiller 2, to which power is transmitted from the traveling machine body 1 side, is interlocked and connected to the center of the drive shaft via a bevel gear mechanism 3a.
is configured as a center drive type. A cylindrical tilling cylinder shaft 6 on which a tilling blade 5 is implanted is spline-fitted to the drive shaft 4, and the tilling cylinder shaft 6 has a triangular shape in a side view, which is integrally provided at the outer end of the tilling cylinder shaft 6. The drive shaft 4 and the tilling tube 6 are integrally attached and fixed by screwing into the outer end of the drive shaft 4 via the mounting bolt 7 which passes through the flange plate 6a from the outside of the flange plate 6a. The tilling cylinder shaft 6 rotates in conjunction with the rotation of the drive shaft 4 to perform tilling work.

Reference numeral 8 denotes a protector made of a plate-like member, and the protector 8 includes a protective protrusion 8a and a rotation prevention protrusion 8b.
are bent in opposite directions to form a rectangular shape when viewed from the rear. As shown in FIG. 3, the outer surface of the flange plate 6a and the bolt head 7a of the mounting bolt 7 are connected.
The protector 8 is installed by attaching and fixing the drive shaft 4 and the tilling cylinder shaft 6 with the middle part of the protector 8 sandwiched between them. The protective protrusion 8a is the bolt head 7a
The tip edge of the protective protrusion 8a projects slightly beyond the bolt head 7a, and the protective protrusion 8a forms a cylindrical rotation locus that is shaped by the rotation of the tilling cylinder shaft 6. A surrounds the bolt head 7a.

On the other hand, at this time, the anti-rotation protrusion 8b is attached to the flange plate 6.
It is adapted to be engaged with the side portion of a to prevent the protection body 8 from rotating.

In the embodiment of the present invention configured as described above, when the drive shaft 3 is rotated to perform tilling work, the drive shaft 4 and the tilling tube shaft 6 are rotated in conjunction with this.
As in the conventional center drive type rotary tiller 2, the rotary tiller rotates integrally and the tiller blade 5 installed on the outer periphery of the tiller cylinder shaft 6 performs tilling work.

During such tilling work, the protective protrusion 8a of the protector 8, which protrudes outward from the flange plate 6a at the outer end of the tilling cylinder shaft 6, protects the axis of the tilling cylinder shaft 6, that is, the mounting bolt 7. Centered on the axis,
As shown in FIG. 4, since it rotates on a cylindrical rotation locus A that exactly surrounds the bolt head 7a, the protective protrusion 8a advances while scraping off the uncultivated soil in advance of the bolt head 7a. . Therefore, even if the bolt head 7a is immersed in uncultivated land due to deep plowing, etc.
As a result of being effectively protected by the protection protrusion 8a that follows the cylindrical rotation trajectory A, the corners of the bolt head 7a will not be worn out and reduced. Furthermore, the protective protrusion 8a that protects the bolt head 7a does not surround and protect the entire outer periphery of the bolt head 7a like the one that protects the bolt head 7a with a cylindrical protective wall, but rather protects the bolt head 7a by rotating it. Since it is intended to be protected by the cylindrical rotation path A when it is moved, mud will not get stuck in the cylindrical rotation path A, and therefore the mounting bolt 7 will not rust. The attachment/detachment work of step 7 can be carried out smoothly. Moreover, when the tiller shaft 6 is stopped, there is nothing to shield the bolt head 7a of the mounting bolt 7 except for the protective protrusion 8a.
When attaching and detaching the attaching bolt 7, the attaching and detaching operation of the attaching bolt 7 can be performed using a spanner, which is a common tool, without requiring a special tool such as a box wrench.

Furthermore, in this embodiment, the protective protrusion 8a is bent and formed on the protector 8 so that it can be attached to and detached from the flange plate 6a using the mounting bolts 7, so that these attaching and detaching operations can be carried out extremely easily. It is advantageous and convenient. Furthermore, since the protective body 8 is subjected to a rotation prevention action by the rotation prevention projection 8b, there is no possibility that the protection projection 8a will rotate inadvertently.

In summary, the present invention involves fitting a tilling cylinder shaft into the outer end of a center drive type drive shaft, and inserting a mounting bolt from the outside through a square flange plate to the outside of the tilling cylinder shaft. In a tilling device in which a tilling cylinder shaft is attached to the tiller, a protector is provided on the outside of the flange plate and has a protective protrusion and a rotation prevention protrusion bent in opposite directions, each having a 〓 shape when viewed from the rear. The protector is configured to be mounted with the mounting bolt through a bolt insertion hole provided in the middle part of the protector, and the rotary locus is designed to surround the bolt head of the mounting bolt when the tiller cylinder shaft rotates. Therefore, the bolt head of the mounting bolt is protected by the cylindrical rotation locus when the protective protrusion, which is merely partially protruding from the outer end of the tilling cylinder shaft, rotates together with the tilling cylinder shaft. As a result, it is possible to effectively prevent the bolt head from being worn out by uncultivated soil during tilling work. Moreover, the protective protrusion only protects the bolt head during tilling work, and when the tiller cylinder shaft stops, it is simply located on the side of the bolt head and does not surround the bolt head in any way. The mounting bolts can be easily attached and detached using ordinary tools such as spanners, without mud getting stuck in the protective track of the bolt head and causing the bolt head to rust.

In addition, since the protector is equipped with anti-rotation protrusions that are bent inward, even if the protective protrusions are subjected to strong resistance from hard cultivated soil, there will be no chance of the protector rotating inadvertently. It has many practical effects such as.

[Brief explanation of the drawing]

The drawings show an embodiment of the protection device for the tilling cylinder shaft mounting bolt according to the present invention, in which Fig. 1 is a side view of the main parts of an agricultural tractor, Fig. 2 is an explanatory view of the operation showing the tilling state, FIG. 3 is an exploded perspective view of the main parts, FIG. 4 is a side view of the main parts showing the operating state, and FIG. 5 is a rear view of the main parts. In the figure, 2 is a rotary tiller,
4 is a drive shaft, 6 is a tilling cylinder shaft, 7 is a mounting bolt, 7a is a bolt head, 8 is a protector, and 8a is a protection protrusion.

Claims (1)

[Scope of utility model registration request] At the outer end of the center drive type drive shaft,
In a tilling device in which a tilling cylinder shaft is fitted and a mounting bolt is inserted from the outside through a square flange plate to the outside of the tilling cylinder shaft to attach the tilling cylinder shaft to a drive shaft, the outside of the flange plate is provided with a protective body that has a cross-shaped shape when viewed from the rear and has protective protrusions and anti-rotation protrusions bent in opposite directions, and the mounting bolts are inserted through bolt insertion holes provided in the middle of the rear protective body. A protection device for a tilling cylinder shaft mounting bolt, characterized in that the tilling cylinder shaft mounting bolt is configured to be mounted on the tilling cylinder shaft, and is provided so that the rotation locus surrounds the bolt head of the mounting bolt when the tilling cylinder shaft rotates.