JP2001289244A - Outer ring rotation-type rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outer ring rotation-type rolling bearing provided with the alignability by an aligning ring, and capable of preventing the oscillating sliding between members in being used in outer ring rotation, and achieving the long life. SOLUTION: An inner peripheral face of an inner ring 1 is a spherical face 1b, the aligning ring 4 having a spherical face 4a to be closely kept into contact with the spherical face 1b on its outer peripheral face, is incorporated into the inner ring 1, and fitted to a fixed shaft 11 to be used in the rotation of the outer ring, whereby the inner ring 1 and the aligning ring 4 can relatively keep a static state even when the rotary member 12 is rotated in an inclined state to the fixed shaft 11, which prevents the oscillating sliding between the inner ring 1 and the aligning ring 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outer ring rotary type rolling bearing, and more particularly to an outer ring rotary type rolling bearing having an aligning function.

[0002]

2. Description of the Related Art A bearing for supporting a shaft on which a relatively large load is applied and which is required to be aligned, such as a bearing for a roll of a rolling mill, is generally provided with a sectional view as shown in FIG. Spherical roller bearings are used. In the spherical roller bearing shown in FIG. 4, two rows of raceway surfaces 41 a and 4
1b is formed, and the raceway surface 42 of the outer race 42 is formed.
a is a shape that forms a part of a spherical surface, and a plurality of spherical rollers 43 having a drum-shaped rolling surface obtained by rotating a part of a circle around a certain axis between an inner ring 41 and an outer ring 42 thereof. Are arranged, and the rolling surface of each spherical roller 43 and the outer ring 42
Is allowed to rotate relative to the raceway surface 42a in the axial direction, so that the assembly of the inner race 41 and the spherical roller 43 can be relatively inclined with respect to the outer race 42.

[0003] As another bearing having the above-described alignment, a cylindrical roller bearing provided with an alignment ring is known. This type of roller bearing has a cross-sectional view shown in FIG.
A plurality of cylindrical rollers 53 are arranged between the inner ring 51 and the outer ring 52 on which the raceway surfaces 51a, 52a for the cylindrical rollers are formed, and the outer surface of the outer ring 52 is formed into a spherical surface 52b. A structure is provided in which an alignment ring 54 having a spherical surface 54a in close contact with the spherical surface 52b of the outer ring 52 is provided.
In such a structure, when the inner ring 51 and the outer ring 52 are tilted, the outer ring 52 and the alignment ring 54 are tilted relatively in the axial direction, so that the entire cylindrical roller bearing is relatively positioned with respect to the alignment ring 54. And the same alignment as a self-aligning roller bearing can be obtained.

[0004]

By the way, in the above-mentioned conventional self-aligning roller bearings and bearings which are provided with an aligning property by using an aligning ring, the outer ring is fixed to the housing. There is no problem when using the inner ring fixed to the rotating shaft, so-called inner ring rotation, but the inner ring is fixed to the fixed shaft and the outer ring is fixed to the rotating member that rotates around the fixed shaft. However, there is a problem that a sufficient life cannot be expected when using the so-called outer ring rotation.

That is, as shown in FIG. 6 by taking a self-aligning roller bearing as an example, when the outer ring 42 is fixed, the inner ring 41 and the outer ring 42 are fixed at a certain angle as shown.
When the inner ring 41 and the spherical roller 43 rotate in a state in which the outer ring 42 is inclined, each spherical roller 43 revolves along a fixed trajectory on the raceway surface 42 a of the fixed outer ring 42. On the other hand, when the inner race 41 is fixed and the outer race 42 rotates, when the outer race 42 rotates in the state of FIG. 6, the spherical rollers 43 are regulated by the raceway surfaces 41a and 41b of the inner race 41, and the shaft Ar Revolves around the plane R with. On the other hand, since the outer race 42 rotates along the plane O about the axis Ao, the contact position between each spherical roller 43 and the raceway surface 42a of the outer race 42 is set in the axial direction of the outer race 42 within a range indicated by an arrow N in the figure. A so-called oscillating slip that moves periodically,
A relatively short period of time will result in a service life due to peeling or the like.

[0006] Such a phenomenon is the same in the cylindrical roller bearing with an aligning ring shown in FIG. 5. When the cylindrical roller bearing is used for inner ring rotation, the cylindrical roller bearing and the aligning ring 54 maintain a constant inclination. The outer ring 52 and the aligning ring 54
No slip occurs between the outer ring 523 and the outer ring 522. However, when the outer ring 523 is used for rotation of the outer ring, a sliding slip occurs between the outer ring 523 and the aligning ring 54 even with a constant inclination, and a long life cannot be expected.

Here, in the case of the self-aligning roller bearing, as shown in a sectional view of FIG. 7, the spherical roller 73 is formed into a drum shape, and the raceway surface 71a of the inner ring 71 is formed into a correspondingly convex spherical surface. And two outer raceway surfaces 72a, 7
Although the above-mentioned problem has been already solved by adopting a special structure provided with 2b, a cylindrical roller bearing with an aligning ring having a structure suitable for outer ring rotation has not yet been developed. It has not been.

The present invention has been made in view of such circumstances, and is a bearing provided with an aligning property by an aligning ring, and furthermore, when used in rotation of the outer ring, the above-mentioned swinging motion is provided between any members. It is an object of the present invention to provide an outer ring rotary type rolling bearing with an aligning function that does not cause a running slip and can achieve a long life.

[0009]

In order to achieve the above object, an outer ring rotating type rolling bearing according to the present invention is provided with an outer ring rotating type rolling bearing for supporting a rotating member with a centering property with respect to a fixed shaft. And an inner ring and an outer ring, a plurality of rolling elements rotatably arranged between the inner ring and the outer ring, and an aligning ring, and the aligning ring is an inner peripheral surface fitted to a fixed shaft. And the inner peripheral surface of the inner ring is formed in a spherical shape in close contact with the spherical outer peripheral surface of the alignment ring.

[0010] The present invention is intended to achieve the intended purpose by providing an aligning ring between an inner ring that does not rotate and a fixed shaft to provide aligning properties.

That is, an aligning ring having a spherical outer peripheral surface is fitted and fixed to a fixed shaft, and an inner ring having a spherical inner peripheral surface that is in close contact with the spherical outer peripheral surface is an aligning ring. , The centering ring and the inner ring, that is, the fixed shaft and the inner ring can be relatively tilted. According to this structure, when the rotating member to which the outer ring is attached rotates with a fixed inclination with respect to the fixed shaft, the inner ring becomes stationary with a fixed inclination with respect to the alignment ring, so No swing sliding occurs between the inner ring and the inner ring.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an axially parallel sectional view of an embodiment of the present invention.

The outer peripheral surface of the inner ring 1 is a raceway surface 1a having a cylindrical surface.
And the inner peripheral surface of the outer ring 2 forms an inner cylindrical raceway surface 2a, and the inner and outer raceway surfaces 1a
A plurality of cylindrical rollers 3 are rotatably disposed in an annular space formed between a and 2a, thereby forming a cylindrical roller bearing. In this example, flanges 2b are formed at both ends of the raceway surface 2a of the outer race 2.

The inner peripheral surface of the inner ring 1 is a spherical surface 1b whose central portion in the axial direction is depressed.
Spherical surface 4 whose central part in the axial direction protrudes so as to be in close contact with
The centering ring 4 in which a is formed on the outer peripheral surface is incorporated.
A slight gap is formed between the spherical surface 1b of the inner ring 1 and the spherical surface 4b of the aligning wheel 4, so that the inner ring 1 can freely tilt with respect to the aligning wheel 4. In addition, the outer peripheral surface 2c of the outer ring 2 and the inner peripheral surface 4b of the alignment ring 4 are a cylindrical surface and an inner cylindrical surface in this example, respectively.

Here, the outer diameter of the central portion of the spherical surface 4a of the aligning ring 4 in the axial direction is larger than the inner diameter of both ends of the spherical surface 1b of the inner ring 1 in the axial direction. As shown schematically in FIG. 2, the aligning ring 4 is not connected all around and is provided with a notch 4c having a predetermined width. Then, when assembling inside the inner ring 1, the alignment ring 4 is inserted from both sides of the notch 4 c.
Then, the notch 4c may be used as a shrinkage allowance for elastic knitting to reduce the outer diameter dimension, and then inserted into the inner ring 1 in that state.

According to the above-described embodiment of the present invention, the inner peripheral surface 4b of the alignment ring 4 is fitted and fixed to the outer peripheral surface of the fixed shaft 11, and the rotating member 12 that rotates around the fixed shaft 11 is fixed.
The outer peripheral surface of the outer ring 2 is fitted and fixed to the outer ring 2. At this time, both ends of the alignment ring 4 are collars 13.
And is fixed to the fixed shaft 11. At this time, the protrusion or pin formed on the collar 13 is fitted into the notch 4c so that the alignment ring 4 rotates with respect to the fixed shaft 11 and the notch 4c does not move into the load zone. It is desirable to prevent creep (rotation) during use.

According to the above-described embodiment of the present invention, when the rotating member 12 rotates at a fixed angle with respect to the fixed shaft 11, the entire outer ring 2, each cylindrical roller 3 and the inner ring 1 rotate. The outer ring 1 and the cylindrical rollers 3 rotate around the inner ring 1 in a state in which the outer ring 1 and each cylindrical roller 3 are inclined with respect to the fixed shaft 11 in accordance with the inclination of the member. At this time, the fixed shaft 1 of the inner ring 1
The inclination with respect to 1 is the spherical surface 1b formed on the inner circumference.
And the spherical surface 4a of the aligning wheel 4 is displaced. However, since the inner ring 1 does not rotate, even if the outer ring 2 and the cylindrical roller 3 rotate, the inner ring 1 and the aligning wheel 4 are relatively stationary. Keep the state. Therefore, in such a use, no swing sliding occurs between any members as in the related art, and peeling or the like due to the sliding does not occur.

In the above embodiment, an example is shown in which a flange 2b is provided on the outer ring 2 side. However, as shown in FIG. Needless to say, a flange 1c may be provided on one side.

In each of the above embodiments, an example in which the present invention is applied to a cylindrical roller bearing is shown. However, the present invention can be equally applied to other types of bearings. Has a structure in which a spherical surface is formed on the inner peripheral surface, and a spherical surface in close contact with the spherical surface has an aligning ring formed on the outer peripheral surface, and the aligning ring is fitted and fixed to a fixed shaft. It should just be.

[0020]

As described above, according to the present invention, the inner peripheral surface of the inner race is formed into a spherical shape, and a spherical surface which is in close contact with the inner peripheral surface of the inner race is formed inside the inner peripheral surface. The inner ring can be freely tilted with respect to the aligning ring fitted and fixed to the fixed shaft by incorporating the aligning ring made of Oscillating slip does not occur between any members, including the center ring, and therefore, when used with outer ring rotation, as in a conventional rolling bearing with an aligning ring provided by an aligning ring. There is no reduction in life due to peeling or the like caused by the above.

[Brief description of the drawings]

FIG. 1 is an axially parallel sectional view of an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a method of assembling the alignment ring 4 inside the inner ring 1 in the embodiment of FIG.

FIG. 3 is an axially parallel sectional view of another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a configuration example of a conventional spherical roller bearing.

FIG. 5 is a cross-sectional view showing a configuration example of a conventional cylindrical roller bearing with an aligning ring.

FIG. 6 is an explanatory view of a oscillating slip that occurs when the self-aligning roller bearing of FIG. 4 is used for outer ring rotation.

FIG. 7 is a cross-sectional view showing a configuration example of a conventional spherical roller bearing suitable for use in outer ring rotation.

[Explanation of symbols]

 Reference Signs List 1 inner ring 1a raceway surface 1b spherical surface 2 outer ring 2a raceway surface 2b flange 2c outer peripheral surface 3 cylindrical roller 4 aligning ring 4a spherical surface 4b inner peripheral surface 4c notch 11 fixed shaft 12 rotating member 13 color

Claims (1)

[Claims] 1. An outer ring rotating type rolling bearing for supporting a rotating member with a centering property with respect to a fixed shaft for rotation, comprising: an inner ring and an outer ring; A rolling element, and an alignment ring, the alignment ring having an inner peripheral surface fitted to a fixed shaft and a spherical outer peripheral surface, and an inner peripheral surface of the inner ring, An outer ring rotary type rolling bearing formed in a spherical shape in close contact with a spherical outer peripheral surface of a core ring.