JP2002188628A - Automatic aligning roller bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a automatic aligning roller bearing device capable of drastically increasing a load capacity at a low cost by adopting an innovative idea. SOLUTION: On the outer peripheral surface of a barrel-like roller 13, an inner peripheral raceway surface of an outer ring 11 and an outer peripheral raceway surface of an inner ring 12 do not contact. Since the area 13a in contact with the outer peripheral surface of the barrel-like roller 13 adjacent to each other in the circumferential direction is formed, however, by bringing the areas 13a into contact with each other under the operating condition of a bearing device 10, the barrel-like rollers 13 adjacent to each other in the circumferential direction guide one another, whereby behaviors by the barrel-like roller 13 can be suppressed without employing a cage. Elimination of the need for the cage provides a low-cost structure. Since no pole for the cage is provided between the barrel-like rollers 13 adjacent to each other in the circumferential direction, in addition, expansion of a roller diameter or increase in the number of rollers can be achieved, which allows drastically increasing the load capacity of the bearing device 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a bearing device,
In particular, the present invention provides a self-aligning roller bearing device that is used in steel rolling equipment, industrial machinery equipment, construction machinery equipment, railway vehicles, and the like, and has high reliability enough to withstand vibration loads, impact loads, and fluctuating loads.

[0002]

2. Description of the Related Art In steel rolling equipment, industrial machinery equipment, construction machinery equipment, railway vehicles, and the like, a bearing device that supports a rotating shaft while receiving a vibration load, an impact load, and a fluctuating load is used. By the way, in a rotating shaft for such an application, the shaft may bend or tilt under a large load, but a so-called self-centering bearing device capable of supporting the rotating shaft even in such a state has been developed. ing.

FIG. 9 is an axial sectional view of a double-row self-aligning roller bearing device according to the prior art. In FIG. 9, the spherical roller bearing device 50 includes an outer ring 51, an inner ring 52,
It has a plurality of barrel-shaped rollers 53, 53 that are rotatably arranged in two rows between the outer ring 51 and the inner ring 52, and retainers 54, 54 that hold the barrel-shaped rollers 53, 53.

[0004] On the inner peripheral surface of the outer ring 51, there is formed an inner peripheral raceway surface 51a whose inner diameter increases toward the center in the axial direction from both ends. Two rows of outer raceway surfaces 52a and 52b are formed on the outer circumferential surface of the inner ring 52. Barrel-shaped rollers 53,
53 is an inner raceway surface 51a and outer raceway surfaces 52a, 52
It is free to roll between b. The retainers 54, 54 formed by pressing are barrel-shaped rollers 53, 53, and ring-shaped portions 54a, 54a arranged outside the separated ends of the barrel-shaped rollers 53, and barrel-shaped rollers circumferentially adjacent to the ring-shaped portions 54a, 54a. 53,
It is composed of pillars 54b, 54b extending substantially in the axial direction between 53.

[0005] When the rotating shaft (not shown) to which the inner ring 52 is fitted is inclined, the bearing device 50 has an inner circumferential raceway surface 51.
The barrel rollers 53, 53 move in the axial direction along a, so that even when the inner ring 52 is inclined, the barrel rollers 53, 5 are tilted.
The rotation shaft can be supported without applying stress to the end of the third shaft.

[0006]

By the way, in the bearing device of the prior art shown in FIG.
Pillar portions 54b, 5 for holding barrel rollers 53, 53 in the circumferential direction
4b, a space is required by the circumferential thickness of the pillars 54b, 54b. Therefore, in a state where the outer diameter of the outer ring 51 is limited to a constant value, the column portions 54b, 54b
When compared to the case without, only the thickness in the circumferential direction,
The roller diameter becomes smaller or the number of rollers becomes smaller,
There is a problem that the load capacity of the bearing device is limited. On the other hand, to increase the roller diameter or the number of rollers,
Although it is conceivable to reduce the circumferential thickness of the cylindrical rollers 4b, 54b, a new problem arises in that the strength of the pillars 54b, 54b required to hold the barrel rollers 53, 53 cannot be obtained.

FIG. 10 is an axial sectional view of another double row self-aligning roller bearing device according to the prior art. In FIG. 10, the self-aligning roller bearing device 60 includes an outer ring 61, an inner ring 62, and a plurality of barrel-shaped rollers 63, 63 that are rotatably arranged in two rows between the outer ring 61 and the inner ring 62. Barrel roller 6
3 and 63 are provided.

[0008] The bearing device 60 has a so-called retaining pad 64, and the retaining port 64 includes two retainers.
The ring part 6 arranged at the center of the barrel rollers 63 of the row
4a, and pillar portions 64b, 64b extending substantially in the axial direction between the barrel rollers 63, 63 adjacent in the circumferential direction so as to face the ring portion 64a.

[0009] Such a fir tree-shaped retainer 64 also has pillar portions 64b, 64b for holding the barrel rollers 63, 63 in the circumferential direction.
, A space is required by the thickness of the pillars 64b, 64b in the circumferential direction. Therefore, in a state where the outer diameter of the outer ring 61 is limited to a fixed value, the roller diameter becomes smaller or the number of rollers becomes smaller by the circumferential thickness when compared with the case where the column portions 64b and 64b are not provided. As a result, there is a problem that the load capacity of the bearing device is limited.
On the other hand, to increase the roller diameter or the number of rollers,
Although it is conceivable to reduce the circumferential thickness of the b and 64b, a new problem arises in that the strength of the column portions 64b and 64b required to hold the barrel rollers 63 and 63 cannot be obtained.

[0010] In addition to the above-mentioned cage, for example, a cage that holds a barrel roller by making a barrel roller hollow and having a pin penetrated therethrough has been developed. Under heavy load conditions, the strength of the barrel rollers and the strength of the pins must be ensured, making the design difficult, and the cost of the bearing device tends to increase.

The present invention has been made in view of the above-mentioned problems of the prior art, and based on an idea different from the conventional art, self-alignment capable of greatly increasing the load capacity at a low cost. An object is to provide a roller bearing device.

[0012]

SUMMARY OF THE INVENTION A self-aligning roller bearing device according to the present invention has an outer ring, an inner ring, and a plurality of barrel rollers which are rotatably disposed between the outer ring and the inner ring. In the self-aligning roller bearing device, the barrel rollers do not come into contact with the inner raceway surface of the outer ring and the outer raceway surface of the inner ring on the outer peripheral surface, but contact with each other in the circumferentially adjacent barrel rollers. That is, they form an interlocking region.

[0013]

A self-aligning roller bearing device according to the present invention comprises a self-aligning roller bearing device having an outer ring, an inner ring, and a plurality of barrel-shaped rollers which are rotatably arranged between the outer ring and the inner ring. In the barrel roller, the outer peripheral surface thereof does not contact the inner raceway surface of the outer race and the outer raceway surface of the inner race, but forms an area in which the barrel rollers adjacent to each other in the circumferential direction contact each other. Therefore, during operation of the bearing device, by bringing these regions into contact with each other, the barrel rollers adjacent to each other in the circumferential direction guide each other, and thereby the behavior of the barrel rollers without using a cage. Can be suppressed. Therefore, by eliminating the need for the cage, a low-cost configuration is provided, and since there is no pillar portion of the cage between the adjacent barrel rollers in the circumferential direction, the roller diameter or the number of rollers is reduced accordingly. Can be increased, whereby the load capacity of the bearing device can be greatly increased.

If the total amount of clearance between the barrel rollers is too small, poor lubrication and slippage are likely to occur. Because there is a possibility of such occurrence, if it is 5 to 15% of the effective maximum diameter of the barrel roller,
It is preferable because those problems can be suppressed.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the spherical roller bearing device according to the first embodiment.
In FIG. 1, a self-aligning roller bearing device 10 includes an outer ring 11 attached to a housing (not shown), an inner ring 12 fitted to a rotating shaft (not shown), and a free rolling between the outer ring 11 and the inner ring 12. And a plurality of barrel-shaped rollers 13 arranged at the same time.

The outer ring 11 has an inner concave inner raceway surface 11a whose inner diameter increases from both ends toward the center in the axial direction. On the other hand, the inner race 12 has an outer concave inner circumferential raceway surface 12a whose outer diameter decreases from the both ends toward the center in the axial direction.

FIG. 2 is a view showing the barrel roller 13 taken out. When viewed in the direction shown in FIG.
Is the curvature of the inner raceway surface 11a and the outer raceway surface 12a shown in FIG. 1 except for the central region 13a whose width in the axial direction is b and the chamfered regions at both ends (range of dimension a from both ends). And has a shape whose outer diameter increases from both ends toward the center.
Rollable between two. The central area 13a is
It has a cylindrical surface shape coaxial with the rotation axis of the barrel roller 13. When the entire length of the barrel roller 13 is represented by lr, the width b of the central region 13a satisfies the relationship of a ≦ b ≦ lr / 2 (1), and the load capacity of the barrel roller 13 is maintained. In addition, the guide function of the central area 13a can be secured, which is preferable.

In the bearing device 10, when the rotating shaft (not shown) to which the inner race 12 is fitted is inclined, the barrel roller 13 moves in the axial direction along the outer raceway surface 12a of the inner race 12. Therefore, even if the inner ring 12 is tilted, the barrel-shaped roller 1
The rotation shaft can be supported without applying stress to the end of the third shaft.

FIG. 3 shows the self-aligning roller bearing device of FIG.
It is the figure seen from the side in the state where the outer race was removed. The central region 13a includes the inner raceway surface 11a of the outer race 11 and the inner race 1
The outer peripheral raceway surfaces 12a (FIG. 1) do not contact with each other, but as is apparent from FIG. 3, the central regions 13a of the barrel rollers 13 adjacent in the circumferential direction are in contact with each other. Therefore, when the bearing device 10 operates, the barrel rollers 13 adjacent to each other in the circumferential direction rotate and revolve while contacting the central regions 13a, so that the axis of the barrel roller 13 is inclined. , And stable rotation can be achieved. The space between the central region 13a and the inner raceway surface 11a and the outer raceway surface 12a can function as a lubricating oil holding unit.

FIG. 4 is a view showing the barrel rollers 13 of the self-aligning roller bearing device of FIG. 1 arranged along a pitch circle and viewed from the axial direction. At this time, if the total clearance ΔC between the barrel rollers 13 is too small, poor lubrication and slippage are likely to occur. May occur. Therefore, when the effective maximum diameter of the barrel roller 13 is Dwa, it is preferable to satisfy the relationship of 0.05 Dwa ≦ ΔC ≦ 0.15 Dwa (2) because the above-described problem can be suppressed.

FIG. 5 is an axial sectional view of a self-aligning roller bearing device according to the second embodiment. In FIG. 5, a self-aligning roller bearing device 20 includes an outer ring 21 attached to a housing (not shown), an inner ring 22 fitted to a rotating shaft (not shown), and a free rolling between the outer ring 21 and the inner ring 22. And a plurality of barrel-shaped rollers 23 arranged at the same time.

The present embodiment differs from the embodiment shown in FIG. 1 only in that the axis of the barrel roller 23 is inclined with respect to the axis of the outer ring 21.
The shape is substantially the same except that the shape of No. 3 is asymmetrical in the axial direction.

FIG. 6 is a view showing the barrel roller 23 taken out. When viewed in the direction shown in FIG.
Has a region 23a which is asymmetrical in the left-right direction and has a width b at a position where its outer diameter is maximum. The barrel roller 23 also has a chamfered area (a range of dimension a1 from both ends) at a large diameter end (right end in FIG. 6) and a chamfered area (a range of dimension a2 from both ends) at a small diameter end (left end in FIG. 6). ), The outer race 21a has a curvature that matches the curvature of the inner raceway surface 21a and the outer raceway surface 22a shown in FIG. And the inner ring 22 is free to roll. The area 23a includes the barrel rollers 23.
It has a cylindrical surface shape that is coaxial with the rotation axis. When the entire length of the barrel roller 23 is represented by lr, the width b of the region 23a is
It is preferable to satisfy the following relationship: a1 ≦ b ≦ lr / 2 (3), since the guide function of the area 23a can be secured while maintaining the load capacity of the barrel rollers 23.

In the bearing device 20, when the rotating shaft (not shown) to which the inner ring 22 is fitted is inclined, the barrel roller 23 moves in the axial direction along the outer raceway surface 22a of the inner ring 22. Therefore, even when the inner ring 22 is inclined, the barrel rollers 2
The rotation shaft can be supported without applying stress to the end of the third shaft.

The region 23a of the barrel roller 23 does not contact the inner raceway surface of the outer race 21 and the outer raceway surface of the inner race 22.
The regions 23a of the barrel rollers 23 that are adjacent in the circumferential direction are in contact with each other. Therefore, the bearing device 20
During the operation of the barrel-shaped rollers 23 adjacent to each other in the circumferential direction,
Since the regions 23a rotate and revolve while making contact with each other, the behavior in which the axis of the barrel rollers 23 is inclined can be suppressed, and stable rotation can be achieved.

FIG. 7 is an axial sectional view of a thrust spherical roller bearing device according to a third embodiment.
In FIG. 7, a self-aligning roller bearing device 30 includes an outer ring 31 attached to a housing (not shown), an inner ring 32 fitted to a rotating shaft (not shown), and a roller that can freely roll between the outer ring 31 and the inner ring 32. And a plurality of barrel-shaped rollers 33 arranged at the same time.

The present embodiment is different from the embodiment shown in FIG. 5 which can mainly receive a radial load only in that it can mainly receive a thrust load. Is omitted.

FIG. 8 is an axial sectional view of a double row self-aligning roller bearing device according to a fourth embodiment. In FIG. 8, a self-aligning roller bearing device 40 includes an outer ring 41 attached to a housing (not shown), an inner ring 42 fitted to a rotating shaft (not shown), and a roller that can freely roll between the outer ring 41 and the inner ring 42. And a plurality of barrel rollers 43, 43 arranged in two rows. This embodiment is different from the embodiment shown in FIG. 1 mainly in that barrel rollers 33 are arranged in double rows and outer ring 41 and inner ring 42 are integrated, and the shape is also the same. Therefore, description is omitted below.

As described above, the self-aligning roller bearing device of the present embodiment operates and operates as described above.
As with conventional spherical roller bearing devices equipped with various types of cages, the range of application is wide, and despite being easy to manufacture, costs can be further reduced and load capacity can be greatly increased. Thus, a structure capable of withstanding various loads such as high load, vibration load, impact load and fluctuating load can be realized.

Although the present invention has been described with reference to the embodiments, the present invention should not be construed as being limited to the above-described embodiments, and it is needless to say that modifications and improvements can be made as appropriate. is there.

[0031]

The self-aligning roller bearing device of the present invention is a self-aligning roller having an outer ring, an inner ring, and a plurality of barrel-shaped rollers rotatably disposed between the outer ring and the inner ring. In the bearing device, the barrel rollers do not contact the inner raceway surface of the outer ring and the outer raceway surface of the inner race on the outer peripheral surface thereof, but a region in which the barrel rollers contact each other in the circumferentially adjacent barrel rollers. When the bearing device is in operation, by contacting such regions during operation of the bearing device, the barrel rollers adjacent to each other in the circumferential direction guide each other to each other, whereby the barrel rollers can be used without using a cage. Can be suppressed. Therefore, since the cage is not required, a low-cost configuration is provided, and since there is no pillar portion of the cage between the adjacent barrel rollers in the circumferential direction,
The roller diameter or the number of rollers can be increased accordingly, and the load capacity of the bearing device can be greatly increased.

[Brief description of the drawings]

FIG. 1 is an axial sectional view of a spherical roller bearing device according to a first embodiment.

FIG. 2 is a view showing a barrel roller 13 taken out.

FIG. 3 is a side view of the spherical roller bearing device of FIG. 1 with an outer ring removed.

FIG. 4 is a view of barrel rollers 13 of the self-aligning roller bearing device of FIG. 1 arranged along a pitch circle and viewed from an axial direction.

FIG. 5 is an axial sectional view of a spherical roller bearing device according to a second embodiment.

FIG. 6 is a view showing a barrel roller 23 taken out.

FIG. 7 is an axial sectional view of a spherical roller bearing device according to a third embodiment.

FIG. 8 is an axial sectional view of a self-aligning roller bearing device according to a fourth embodiment.

FIG. 9 is an axial sectional view of a self-aligning roller bearing device according to the related art.

FIG. 10 is an axial sectional view of a self-aligning roller bearing device according to another related art.

[Description of Signs] 10, 20, 30, 40 Bearing device 11, 21, 31, 41 Outer ring 12, 22, 32, 42 Inner ring 13, 23, 33, 43 Barrel rollers 13a, 23a, 33a, 43a Roller central part Area of

Claims (1)

[Claims] 1. A self-aligning roller bearing device having an outer ring, an inner ring, and a plurality of barrel rollers which are arranged to be rotatable between the outer ring and the inner ring. A self-aligning roller bearing device having an outer peripheral surface that does not contact the inner raceway surface of the outer race and the outer raceway surface of the inner race, but forms an area where the barrel rollers adjacent to each other in the circumferential direction contact each other.