JPH0840530A - Shaft bush for conveyor roller - Google Patents

Abstract

PURPOSE:To simplify the structure of a conveyor roller shaft bush which can control noise generated during the rotation of a conveyor roller. CONSTITUTION:This is a shaft bush 10 which is attached to the shaft part of a conveyor roller 30 supported rotatably on a conveyor frame 40 by a roller shaft 50 through a bearing 20. The shaft bush 10 has an insertion through-hole 14 where a roller shaft 50 is inserted through; a bearing inserting part 11 which is inserted into the inner ring 21 of the bearing 20; a flange part 12 which extends out of the bearing inserting part 11 and is made to abut on the side face of the inner ring 21 of the bearing 20; and a boss part 13 which protrudes from the end of the conveyor roller 30 for securing a space between the conveyor frame 40 and the conveyor roller 30. The parts are integratedly formed of a synthetic resin or rubber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft bush of a conveyor roller, and more particularly to a shaft bush mounted on a shaft portion of a conveyor roller rotatably supported by a roller shaft via a bearing on a conveyor frame.

[0002]

2. Description of the Related Art A conveyor roller is generally rotated to a conveyor frame by a roller shaft through a JIS standard bearing, a bearing having a coarser step accuracy than a so-called precision bearing, a so-called press bearing, as shown in FIG. Freely supported. However, the conveyor roller using such a press bearing has a problem that noise is generated from the bearing itself when rotating.

In order to reduce the cost, the roller shaft for supporting the conveyor roller on the conveyor frame is as coarse as the press bearing in terms of the dimensional accuracy of the outer diameter. In order to improve the performance, an outer diameter smaller than the inner diameter of the inner ring of the bearing is used. However, in a conveyor roller using such a roller shaft,
During the rotation, there was a problem that noise was generated due to rattling between the roller shaft and the inner ring of the bearing.

In particular, when the conveyor roller is rotated at a high speed in response to the recent demand for high-speed production lines, noise is generated from the above-mentioned rattling itself and the rattling between the inner ring of the bearing and the roller shaft. The problem is noticeable.

In order to solve such a noise problem, for example, as shown in FIG. 9, it is conceivable to use a precision bearing instead of the press bearing to suppress the noise generated from the bearing itself. However, even for conveyor rollers that use precision bearings, in order to reduce costs and improve workability, the roller shaft has a coarse outer diameter dimensional accuracy as described above and is smaller than the inner diameter of the inner ring of the bearing. Since the outer diameter must be used, rattling between the inner ring of the bearing and the roller shaft inevitably occurs, and noise generated from this rattling cannot be suppressed.

Further, the precision bearing has its shape and dimensions standardized by the JIS standard, and there is no one having a shape in which the inner ring projects as shown in FIG. Therefore, in order to secure the space between the conveyor frame and the conveyor roller, a collar or the like must be interposed between the conveyor frame and the bearing. However, when the collar or the like is interposed in this way, there is a problem that rattling occurs between the collar or the like and the conveyor frame, the bearing, or the roller shaft, and the rattling causes noise.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shaft bush of a conveyor roller which can suppress noise generated when the conveyor roller rotates with a simple structure. It is provided by the structure.

[0008]

Means for Solving the Problems In order to solve the above problems, the means adopted by the present invention will be described with reference to the reference numerals used in the drawings. A shaft bush 10 mounted on a shaft portion of a conveyor roller 30 rotatably supported by 50, an insertion hole 14 into which the roller shaft 50 is inserted, and a bearing insertion inserted into an inner ring 21 of the bearing 20. Part 11 and this bearing insertion part 11
The flange portion 12 that extends from the side surface of the inner ring 21 of the bearing 20 and protrudes from the end portion of the conveyor roller 30. The conveyor frame 40 and the conveyor roller 30.
The shaft bush 10 ″ of the conveyor roller 30 is characterized in that the shaft bush 10 ″ is provided with a boss portion 13 that secures an interval between and, and these are integrally formed of synthetic resin or rubber.

[0009]

The shaft bushing 10 of the conveyor roller 30 according to the present invention thus constructed is interposed between the inner ring 21 of the bearing 20 and the roller shaft 50 in the shaft portion of the conveyor roller 30. Since it is formed of synthetic resin or rubber, even if there is rattling between the shaft bush 10 and the roller shaft 50, noise and vibration generated from this rattling are small.

The distance between the conveyor roller 30 and the conveyor frame 40 is ensured by the boss portion 13 of the shaft bush 10. Here, since the shaft bush 10 is integrally formed of synthetic resin or rubber including the boss portion 13, rattling occurs between the boss portion 13 and the conveyor frame 40 or the roller shaft. However, the noise generated from this rattling is small.

[0011]

Embodiments of the shaft bush 10 of the conveyor roller 30 according to the present invention will now be described in detail with reference to the drawings.

First, FIG. 1 shows an embodiment of a shaft bush 10 of a conveyor roller 30 according to the present invention. The shaft bush 10 is integrally formed of synthetic resin or rubber in a substantially cylindrical shape as a whole, and has an insertion hole 14 into which the roller shaft 50 is inserted and a bearing insertion portion 11 inserted into the inner ring 21 of the bearing 20. And a flange portion 12 which is formed to extend substantially in the middle and abuts against the side surface of the inner ring 21 of the bearing 20 to prevent the bearing insertion portion from being inserted into the inner ring 21 of the bearing 20 more than necessary, and this flange portion. 12 protruding from the conveyor roller 30 and the conveyor frame 40
And a boss portion 13 that secures a space between

If the shaft bush 10 formed by coloring the synthetic resin or rubber itself as the material has a different color depending on the dimensions of the through hole 14 and the bearing insertion portion 11, etc., the shaft bush 10 itself. The type of the bearing 20 and the type of the roller shaft 50 that can be used can be determined by the color of. Further, if the color of the shaft bush 10 is changed for each of various conveyor lines, the type of the conveyor line can be determined by the color of the shaft bush 10. Here, it is conceivable to apply a paint to the whole to color it after the shaft bush 10 is formed. However, if the material itself is colored, it is convenient because there is no risk of the color being peeled off due to rubbing of the surface during use.

FIG. 2 shows an example in which the shaft bush 10 is used to rotatably support the conveyor roller 30 on the conveyor frame 40. Next, the structure of the shaft portion of the conveyor roller 30 will be described in detail. Explained.

At the end of the conveyor roller 30, a casing 31 in which the precision bearing 20 is stored is inserted, and the bearing insert portion 11 of the shaft bush 10 is inserted into the inner ring 21 of the precision bearing 20. There is. Here, the flange portion 12 of the shaft bush 10 is in contact with the side surface of the inner ring 21 of the precision bearing 20, and the flange portion 12 prevents the inner ring 21 of the bearing 20 from being inserted more than necessary.

If the bearing insertion portion 11 of the shaft bush 10 is inserted into the inner ring 21 of the bearing 20 by press fitting, the inner ring 21 of the bearing 20 is inserted.
This is convenient because the shaft bush 10 can be reliably fixed to the bearing 20 without rattling between the shaft bush 10 and the bearing insertion portion 11 of the shaft bush 10.

On the other hand, in the through hole 14 of the shaft bush 10,
The roller shaft 50 is inserted, and the roller shaft 50
The end portion of is inserted into the conveyor frame 40 and fixed by a nut. Here, the end portion of the boss portion 13 of the shaft bush 10 is in contact with the side surface of the conveyor frame 40, and the boss portion 13 allows the conveyor roller 3 to move.
A space between 0 and the conveyor frame 40 is secured.
In this embodiment, the roller shaft 50 is fixed to the conveyor frame 40 with a nut, but
Not limited to this, it may be fixed by various known means.

Next, FIG. 3 shows another embodiment of the shaft bush 10. In this example, casing 3
1. Precision bearing 20 and this precision bearing 20
The shaft bush 10 inserted into the housing is stored in advance.
Here, the flange portion 12 of the shaft bush 10 is formed to extend so as to cover substantially the entire side surface of the precision bearing 20, and the flange portion 12 serves as a dust cover of the precision bearing 20. . In this way, the bearing 20 having no dust cover can also be used.

Next, FIG. 4 shows still another embodiment of the shaft bush 10. This shaft bush 10 is shown in FIG.
In addition to the shaft bush 10 shown in FIG. 2, a second collar portion 15 extending from the end of the boss portion 13 and a frame insertion portion 16 protruding from the second collar portion 15 are provided. It is a thing. As shown in FIG. 5, the shaft bush 10 is configured such that the frame insertion portion 16 is inserted into the conveyor frame 40, and the second flange portion 15 is brought into contact with the side surface of the conveyor frame 40, so that the conveyor roller 30 has the same structure. It is attached to the shaft part. If such a shaft bush 10 is used, the shaft bush 1 made of synthetic resin or rubber is provided between the roller shaft 50 and the conveyor frame 40.
Since the frame insertion portion 16 of 0 is interposed,
Noise and vibration transmitted from the roller shaft 50 to the conveyor frame 40 can be suppressed.

As described above, the conveyor frame 40
In the case of providing the second collar portion 15 that abuts on the side surface of each of the two collar portions 1, as shown in FIG.
For example, as shown in FIG. 6, the entire boss portion 13 is formed to be extended without providing 2, 15 and one end surface of the boss portion 13 is used as the flange portion 12 that abuts the inner ring 21 of the bearing 20, and The end surface may be the second flange 15 that abuts the side surface of the conveyor frame 40. In addition, the frame insertion portion 16
7 is inserted into the conveyor frame 40, for example, as shown in FIG. 7, the peripheral surface of the frame insertion portion 16 is partially cut out, and a hole having a shape that fits with the peripheral surface is provided in the conveyor frame 40. When the frame insertion portion 16 is fitted in the hole of the frame 40, the shaft bush 10 can be made unrotatable with respect to the conveyor frame 40, that is, the shaft bush 10 can be fixed to the conveyor frame 40. It is convenient and convenient. Here, the fitting shape of the frame insertion portion 16 and the hole of the conveyor frame 40 is not limited to this, and various shapes can be used as long as the shaft bush 10 can not be rotated with respect to the conveyor frame 40. The shape can be adopted.

[0021]

As described above in detail, the shaft bush according to the present invention is mounted between the inner ring of the bearing and the roller shaft in the shaft portion of the conveyor roller, and its through hole and roller are used. Even if there is rattling with the shaft, the noise caused by this rattling can be suppressed. Also, even if a precision bearing whose inner ring has a protruding shape is not standardized, the spacing between the conveyor roller and the conveyor frame should be secured without using a collar, etc., which is a new source of noise. It was made possible.

Therefore, according to the present invention, it is possible to provide the shaft bush of the conveyor roller, which can suppress the noise generated when the conveyor roller rotates, with a simple structure.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a shaft bush according to the present invention.

2 is a sectional front view showing a structure of a shaft portion of a conveyor roller that employs the shaft bush shown in FIG. 1. FIG.

FIG. 3 is a sectional front view showing another embodiment of the shaft bush according to the present invention.

FIG. 4 is a perspective view showing another embodiment of the shaft bush according to the present invention.

5 is a partial sectional front view showing the structure of a shaft portion of a conveyor roller that employs the shaft bush shown in FIG.

FIG. 6 is a perspective view showing another embodiment of the shaft bush according to the present invention.

FIG. 7 is a perspective view showing another embodiment of the shaft bush according to the present invention.

FIG. 8 is a partial sectional front view showing the structure of a shaft portion of a conventional conveyor roller.

FIG. 9 is a sectional front view showing a structure of a shaft portion of a conventional conveyor roller.

[Explanation of symbols]

 10 Shaft Bushing 11 Bearing Insertion Part 12 Collar Part 13 Boss Part 14 Through Hole 15 Second Collar Part 16 Frame Insertion Part 20 Bearing (Precision Bearing) 21 Inner Ring 30 Conveyor Roller 31 Casing 40 Conveyor Frame 50 Roller Shaft

Claims (1)

[Claims] 1. A shaft bush mounted on a shaft portion of a conveyor roller rotatably supported by a roller shaft on a conveyor frame via a bearing, the insertion hole having the roller shaft inserted therethrough, and the bearing of the bearing. A bearing insertion part that is inserted into the inner ring, a flange part that extends from this bearing insertion part and abuts on the side surface of the inner ring of the bearing, and that protrudes from the end part of the conveyor roller and secures the interval between the conveyor frame and the conveyor roller. A shaft bush of a conveyor roller, characterized in that the shaft bush of the conveyor roller is integrally formed of synthetic resin or rubber.