JP2003343574A - Roller bearing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing having a good pin type holder in which annular side plates do not drop even when the welding part of a pin is broken. <P>SOLUTION: The roller bearing comprises the pin type holder 21 having a plurality of pins 22 with both ends connected to the first and the second annular side plates 23 and 4 coaxially opposite to each other and a plurality of hollow rollers 10 respectively supported in the outer peripheries of the pins 22 so as to freely rotate and roll between an inner and outer rings 20 and 30. In one end side of each pin 22, a tapered male screw 25 screwed to a tapped hole 26 formed in the first annular side plate 23 is formed. In the other end side, a fitting shaft 7 fitted and welded to the second annular side plate 4 is formed. The fastening direction C1 of the tapered male screw 25 relative to the tapped hole 26 is the same as the rotating direction B1 of each roller 10 in use. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller bearing, and more particularly to improvement of a roller bearing in which a hollow roller is held between inner and outer rings by a pin type cage.

[0002]

2. Description of the Related Art As a type of large-sized roller bearings used in places where high load capacity is required such as in steelmaking equipment and papermaking machines, the "rollers" that are rolling elements are hollow and By inserting both ends of the pin through which the pin is rotatably supported to the first and second annular side plates that are coaxially opposed to each other, the interval between the rollers is reduced and the number of rollers is increased. A roller bearing having a pin type retainer in which rollers are held at a constant interval between an inner ring and an outer ring is known (Japanese Utility Model Publication 5-13).
381, JP-A-11-51062).

In this type of roller bearing, as shown in FIGS. 4 and 5, both ends of a pin 2 constituting a pin type cage 1 are connected to first and second annular side plates 3 and 4, respectively. A tapered male screw (male screw) 5 is formed on one end of the pin 2, the tapered male screw 5 is fastened to a screw hole 6 of the first annular side plate 3, and a fitting shaft portion 7 is formed on the other end of the pin 2. Then, the fitting shaft portion 7 is fitted into the fitting hole 8 of the second annular side plate 4 and then fixed by welding all around (the welding portion is designated by reference numeral 9 in FIG. 5). Shown).

A through hole 11 having an inner diameter slightly larger than the outer diameter of the pin 2 is formed in the center of the hollow roller 10.
The same number of pins 2 as the number of hollow rollers 10 are inserted into the through holes 11 of each hollow roller 10. When the pin type cage 1 is used on the horizontal axis,
The weight of the entire cage is supported only by the contact portion between the through hole 11 and the pin 2, and the roller guide type cage in which the first and second annular side plates 3 and 4 do not contact the races is formed.

[0005]

By the way, in the roller bearing using the pin type cage 1 of this type, the hollow roller 1
Due to the frictional force between the inner circumference of the through hole 11 of 0 and the outer circumference of the pin 2, the rotational force due to the rotation of the hollow roller 10 is transmitted to the pin 2 during operation. For example, as shown in FIG.
The inner ring 20 is rotated in the counterclockwise direction (in the figure,
When rotated in the direction of arrow A1), the hollow roller 10 rotates in the clockwise direction (direction of arrow B1 in the figure) to rotate the pin type cage 1 in the counterclockwise direction, and accordingly, the pin 2 also rotates in the clockwise direction. Rotational force in the direction acts.

Therefore, as shown in FIG. 7, when a crack 9a is generated in the welded portion 9 due to an abnormally strong impact or the like and the welded portion is peeled off, the cylindrical fitting shaft portion 7 rotates the pin 2. The pin 2 loses its restraining force, and the pin 2 starts to rotate as the hollow roller 10 rotates. If the direction in which the rotational force is applied at this time coincides with the loosening direction of the threaded connection portion of the pin 2, the threaded connection may be released and the first annular side plate 3 may fall off.

That is, the hollow roller 1 indicated by the arrow B1 in FIG.
When the rotation direction of 0 and the loosening direction of the taper male screw 5 of the pin 2 (arrow C1 in the figure) are matched, the rotation of the fitting shaft portion 7 of the pin 2 is prevented due to damage of the welded portion 9. When the restraining force disappears, the taper male screw 5 of the pin 2 starts to loosen with respect to the screw hole 6 by the rotational force transmitted by the frictional force between the hollow roller 10 and the pin 2.

When the tapered male screw 5 of the pin 2 is loosened with respect to the screw hole 6, the first annular side plate 3 eventually falls off, and the pin type cage 1 is formed only by the second annular side plate 4 and the pin 2. The hollow rollers 10 are supported, and the function as a cage can no longer be fulfilled, so that smooth operation cannot be guaranteed. Therefore, an object of the present invention is to solve the above problems, and to provide a roller bearing provided with a good pin type retainer in which an annular side plate does not fall off even if a welded portion of a pin is damaged. Is.

[0009]

The above object of the present invention is to provide a pin type retainer having a plurality of pins whose both ends are coupled to first and second annular side plates that are coaxially opposed to each other.
A roller bearing comprising: a plurality of hollow rollers rotatably supported on the outer circumference of each pin and rotatably provided between an inner ring and an outer ring, wherein the first annular shape is provided at one end of each pin. A male screw portion that is screwed into a screw hole formed in the side plate is formed, and a fitting shaft portion that is fitted and welded to the fitting hole formed in the second annular side plate is formed on the other end side. Is formed, a direction in which the male screw portion is tightened with respect to the screw hole,
This is achieved by a roller bearing characterized in that the rotating directions of the hollow rollers in use are the same.

According to the above structure, the direction in which the male screw portion formed on the one end side of each pin is tightened with respect to the screw hole of the first annular side plate is the same as the rotating direction of each hollow roller when the bearing is used. Direction. Therefore, even when the welded portion of the fitting shaft portion formed on the other end side of each pin is damaged and the rotation restraining force on the pin is lost, the rotation force in the direction in which the male screw portion is tightened acts on the pin. Therefore, the male screw portion does not loosen with respect to the screw hole, and the first annular side plate is prevented from falling off.

Preferably, the rotation direction of the pin type cage is designated so that the direction in which the male screw is tightened with respect to the screw hole is the same as the rotation direction of each hollow roller in use. A mark is made on the bearing surface. The position where the mark is attached is preferably set at an easily visible place such as the outer surface of each annular side plate or the end surface of the inner ring or the outer ring.

In this case, since the roller bearing may be installed so that the pin type cage is operated in the rotation direction designated by the mark, the assembling workability is improved. Further, as a means for making the direction in which the male screw portion is tightened with respect to the screw hole and the direction of rotation of the hollow rollers in use in the same direction, the mounting direction of the pin type cage with respect to the inner and outer races is appropriately changed. It is possible to use means such as appropriately changing the mounting direction of the roller bearing with respect to the bearing housing, and forming the male screw portion into a reverse screw as appropriate.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A roller bearing having a pin type cage according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a partial front view of a roller bearing including a pin type cage according to an embodiment of the present invention,
2 is a sectional view taken along the line II-II of FIG. 1, and FIG.
FIG. 3 is a sectional view taken along the line I-III.

As shown in FIG. 1, the roller bearing of this embodiment includes an inner ring 20 and an outer ring 30, and a plurality of hollow rollers 10 rotatably sandwiched between the inner ring 20 and the outer ring 30.
And a pin type cage 21 that holds the plurality of hollow rollers 10 at predetermined intervals. The pin type retainer 21 has first and second annular side plates 23, 4 that are coaxially opposed to each other, and a plurality of pins 22 whose both ends are connected to the annular side plates 23, 4. By passing each pin 22 through the through hole 11 of each hollow roller 10, the hollow roller 10 is rotatably supported on the outer periphery of the pin 22.

A taper male screw (male screw) 25 is formed at one end of the pin 22, and a fitting shaft portion 7 is formed at the other end. A flange 7a is provided at the end of the fitting shaft portion 7.
Is provided. Therefore, first, each screw hole 26 of the first annular side plate 23, the through hole 11 of each hollow roller 10, and the second hole
After aligning the fitting holes 8 of the annular side plate 4 on the same straight line, the pin 22 is inserted and the taper male screw 2 is inserted into the screw hole 26.
Tighten 5.

Here, unlike the tapered male screw 5 and the screw hole 6 shown in FIG. 5, the tapered male screw 25 and the screw hole 26 are formed as a reverse screw (left screw). The direction of arrow C1 is the tightening direction. And
With the flange portion 7a provided at the end of the fitting shaft portion 7 engaged with the stepped portion 8a of the fitting hole 8, the fitting shaft portion 7 is welded and fixed to the second annular side plate 4. To do.

Further, with the outer ring 30 fixed, the inner ring 2
When 0 is rotated in the counterclockwise direction (arrow A1 direction in the figure), the taper male screw 25 is tightened with respect to the screw hole 26 (arrow C1 direction in the figure), and Rotational direction of each hollow roller 10 (direction of arrow B1 in the figure)
Since the roller bearings are assembled in the bearing housing so that and are in the same direction, the inner ring 20 is a place where the bearing surface is easily visible.
As shown in FIG. 1, marks 50a and 50b for designating the rotation direction of the pin type cage 21 are attached to the end surface of the pin type retainer 21 and the outer surface of the first annular side plate 23. Of course, a similar mark may be attached to the end surface of the outer ring 30.

That is, according to the roller bearing of the present embodiment, the welded portion 9 of the pin type cage 21 is damaged due to welding peeling or the like due to an abnormally strong impact, and the rotational restraining force on each pin 22 is exerted. When it disappears, the pin 22 tries to rotate as the hollow roller 10 rotates, but the hollow roller 10
Since the direction of rotation of the pin and the tightening direction of the taper male screw 25 are the same, the pin 22 has the taper male screw 25.
Rotational force acts in the direction of tightening.

Therefore, the taper male screw 25 of the pin 22 does not loosen in the screw hole 26, and the first annular side plate 23
Is prevented from falling off. Further, even if the welded portion 9 is peeled off, the flange portion 7a provided at the end portion of the fitting shaft portion 7 is engaged with the stepped portion 8a of the fitting hole 8, so that the head portion of the pin 22 is removed. The second annular side plate 4 will not fall off.

In the above embodiment, the case where the inner ring 20 is rotated counterclockwise (direction of arrow A1 in the figure) with the outer ring 30 fixed has been described.
Of course, the present invention can be applied to the case where the inner ring 20 is rotated in the clockwise direction or the case where the inner ring 20 is fixed and the outer ring 30 is rotated. Further, the present invention is used for a rolling mill, a speed reducer, etc., in which the rotating direction is constant. However, for example, when the inner ring 20 is rotated in the clockwise direction (the direction opposite to the arrow A1 direction in the figure) with the outer ring 30 fixed, the mounting directions of the pin type cage 21 with respect to the inner and outer rings 20, 30 are opposite. (In FIG. 1, the second annular side plate 4 is on the front side), or the taper male screw 25 is formed into a right-hand thread by using a means such as forming the taper male screw 25 and the screw hole 26 into a right-hand thread. The direction of tightening with respect to 26 and the direction of rotation of each hollow roller 10 in use is the same direction.

In the above embodiment, the cylindrical roller bearing in which the pin type retainer 21 supports the cylindrical hollow roller 10 has been described as an example, but the pin type retainer supports the conical hollow roller. It goes without saying that the present invention can also be applied to roller bearings and double-row roller bearings.

[0022]

As described above, according to the roller bearing of the present invention, the male screw portion formed on one end side of each pin is the first.
The direction of tightening with respect to the screw hole of the annular side plate and the direction of rotation of each hollow roller when the bearing is used are the same direction. Therefore, even when the welded portion of the fitting shaft portion formed on the other end side of each pin is damaged and the rotation restraining force on the pin is lost, the rotation force in the direction in which the male screw portion is tightened acts on the pin. Therefore, the male thread does not come loose with respect to the screw hole.
The annular side plate of is prevented from falling off. Therefore, it is possible to provide a roller bearing provided with a good pin type cage in which the annular side plate does not fall off even if the welded portion of the pin is damaged.

[Brief description of drawings]

FIG. 1 is a partial front view of a roller bearing including a pin type cage according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is an exploded perspective view of essential parts of a roller bearing provided with a conventional pin type cage.

5 is a cross-sectional view of a main part of the pin type cage shown in FIG.

6 is a sectional view taken along the line VI-VI of FIG.

7 is a cross-sectional view of a main part for explaining a problem of the pin type cage shown in FIG.

[Explanation of symbols]

4 Second annular side plate 7 Mating shaft 8 fitting holes 21 pin type cage 22 pin 23 First annular side plate 25 Tapered Male Thread (Male Thread) 26 screw holes 10 hollow rollers 20 inner ring 30 outer ring 50a, 50b marks

Claims (2)

[Claims] 1. A pin type retainer having a plurality of pins whose both ends are coupled to first and second annular side plates that are coaxially opposed to each other, and rotatably supported on the outer circumference of each of the pins. A roller bearing including a plurality of hollow rollers rotatably provided between an inner ring and an outer ring, wherein one end of each pin is screwed into a screw hole formed in the first annular side plate. A male screw portion is formed, and a fitting shaft portion that is fitted and welded to a fitting hole formed in the second annular side plate is formed on the other end side, and the male screw portion is the screw portion. A roller bearing characterized in that the direction in which it is tightened with respect to the hole and the rotation direction of each of the rollers in use are the same direction. 2. A mark for designating a rotation direction of the pin type cage so that a direction in which the male screw is tightened with respect to the screw hole and a rotation direction of each of the rollers in use are the same direction. The roller bearing according to claim 1, wherein the roller bearing is attached to the bearing surface.