JP2002339985A - Roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply assemble a roller bearing in a housing. SOLUTION: In the roller bearing 10 comprising an outer ring 11 having a recessed raceway surface 15 provided on an inner circumferential surface, an inner ring 16 having a recessed raceway surface 17 on an outer circumferential surface, and a plurality of rolling surfaces 14 provided on an outer circumferential surface of each roller 13. A center part of either the recessed raceway surfaces 15 and 17 or a projecting rolling surface 14 of each roller 13 is formed of a first generator having a predetermined radius of curvature, both end part sides adjacent to the center part are formed of a second generator having the radius of curvature separate from the other one of either the recessed raceway surfaces 15 and 17 or the projecting rolling surface 14 of each roller 13, and the roller bearing 10 has a flange 19 on an outer circumferential surface of the outer ring 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a roller bearing.

[0002]

2. Description of the Related Art A conventional roller bearing will be described with reference to FIG. FIG. 6 is a symmetrical sectional view about the axis C. The conventional roller bearing 100 includes an outer ring 10 as shown in FIG.
1 is used by being fixed to a fitting hole 102a formed in the housing 102. Rollers 103 are provided on the inner peripheral surface of the outer race 101.
A raceway surface 105 that is in contact with the rolling surface 104 is formed. The rolling surface 104 of the roller 103 is also in contact with a raceway surface 107 formed on the outer peripheral surface of the inner ring 106. A shaft 108 is fixed to the inner peripheral surface of the inner ring 106, and rotation of the shaft 108 about the axis C is directly transmitted to the inner ring 106. A plurality of rollers 103 are provided, and the rollers 103 are held at equal intervals by a holder (not shown). The roller bearing 100 is a tapered roller bearing in which the rollers are formed in a substantially conical shape. Further, as shown in the figure, two roller bearings 100 are used to face each other.

[0003]

The roller bearing 1
When mounting 00 on the housing 102, there are the following problems.

[0004] The roller bearing 100 must be mounted so that the axis of the outer ring 101 and the axis of the inner ring 106 do not cross each other, that is, the axis of the roller C does not deviate from the axis C. Therefore, when attaching the roller bearing to various devices, the axis of the outer ring 101 and the inner ring 10
It is necessary to match the axes 6 with high precision. Specifically, the permissible inclination angle of the roller bearing 100 is generally set at 0.
As small as 0009 rad, and two roller bearings 1
Since the outer peripheral surface of the outer race 101 is fixed to the housing 102, the housing 1
It is necessary to process the fitting hole 102a of No. 02 with high precision and align the axis with the fitting hole 102a of the opposing roller bearing 100. For this reason, machining of the housing 102 requires high precision, and furthermore, it is not easy to incorporate the bearing with high precision.

For example, in the case of the above bearing 100, if the allowable inclination angle is 0.0009 rad, the roller bearing 100
If the distance between them is 100 mm, the deviation between both axes must be within 0.009 mm. That is, a high mounting accuracy is required.

[0006] The present invention has been made in view of the above-described problems, and has as its object the purpose of incorporating a roller bearing into
An object of the present invention is to provide a roller bearing that simplifies the processing of a housing and that can be easily assembled.

[0007]

In order to achieve the above-mentioned object, the present invention provides an outer race having a concave raceway surface on an inner peripheral surface and a concave raceway on an outer peripheral surface. An inner ring provided with a surface, and a plurality of rollers disposed between the concave raceway surfaces, a roller bearing provided with a convex rolling surface on the outer peripheral surface of each roller, wherein each of the concave raceway surface A central portion of one of the convex rolling surfaces of each of the rollers is formed by a first bus bar having a constant radius of curvature, and both end sides adjacent to the central portion are each of the concave raceway surfaces. It is formed by a second bus bar having a radius of curvature such that it is separated from the other of the convex rolling surfaces of the rollers, and further has a flange for mounting to a housing on the outer peripheral surface of the outer ring. It is characterized by:

According to another aspect of the present invention, there is provided an outer race having a convex raceway surface on an inner peripheral surface and a convex raceway surface on an outer peripheral surface. In the roller bearing provided with an inner ring provided and a plurality of rollers disposed between the respective convex raceway surfaces, and in the roller bearing provided with a concave rolling surface on the outer peripheral surface of each roller, the respective convex raceway surfaces, A central part of one of the concave rolling surfaces of the rollers is formed by a first generatrix having a constant radius of curvature, and both end sides adjacent to the central part have the convex raceway surfaces and the convex raceway surfaces. It is formed by a second bus bar having a radius of curvature so as to be separated from the other of the concave rolling surfaces of the rollers, and further has a flange for attachment to a housing on an outer peripheral surface of the outer ring. It is characterized by.

In the first aspect of the present invention, each of the concave raceway surfaces or the convex rolling surfaces of the rollers is formed by a first bus and a second bus which are continuous with each other and have different radii of curvature. It is good.

More specifically, when forming the convex rolling surface of the rollers by the first bus bar and the second bus bar, the central portion of the convex rolling surface is formed in a convex shape corresponding to the bus line of each concave raceway surface. In addition to forming the first bus bar, both ends of the convex rolling surface may be formed of the second bus bar having a smaller radius of curvature than the first bus bar.

On the other hand, when each concave raceway surface is formed by the first generatrix and the second generatrix, the central portion of each concave raceway surface is formed by a concave first generatrix corresponding to the generatrix of the roller rolling convex surface. In addition, the end surface side of each concave raceway surface may be formed by a concave second bus bar having a larger radius of curvature than the first bus bar.

[0012] The center of the radius of curvature of the first bus bar is located at a position farther from the axis of the bearing, so that the edge load is very effectively reduced.

In the invention described in claim 2, each of the convex raceway surfaces or the concave rolling surfaces of the rollers can be formed by a first bus bar and a second bus bar which are continuous with each other and have different radii of curvature. I just need.

Specifically, when the concave rolling surface of the roller is formed by the first bus and the second bus, the center of the concave rolling surface is formed by a concave first rolling member corresponding to the generating line of each convex raceway surface. In addition to the first bus bar, both ends of the concave rolling surface may be formed by the second bus bar having a larger radius of curvature than the first bus bar.

On the other hand, when each convex raceway surface is formed by the first busbar and the second busbar, the center of each convex raceway surface is formed by a first convex busbar corresponding to the busbar of the concave rolling surface of the roller. And the end face side of each convex raceway surface may be formed by a convex second bus having a smaller radius of curvature than the first bus.

In these cases, the first bus and the second bus
The first bus and the second bus are smoothly continuous so that the boundary of the bus does not become a peak or a groove, or chamfering is performed along the boundary between the first bus and the second bus. It is good.

The above-mentioned concave raceway surface and convex raceway surface, and the convex rolling surface and the concave rolling surface are not limited to those formed only by the first bus and the second bus.
It may be formed by one or more types of buses.

In the roller bearing constructed as described above, a relatively large gap is formed between the raceway surface and the end of the rolling surface of the roller.
Even when a large axial misalignment occurs between the outer ring and the inner ring, an edge load or the like does not occur. Therefore, when the roller bearing is mounted on the housing or the like, the consideration of the shaft center deviation can be reduced as compared with the conventional type, and the processing accuracy with respect to the housing or the like and the alignment of the shaft center can be simplified. Since the roller bearing is fixed to the housing by the fixing flange provided on the outer ring, the roller bearing can be easily attached by, for example, forming a bolt hole in the flange. There is no need to machine the outer ring fitting hole in the housing with high precision unlike the conventional type. The flange may be integral with or separate from the outer ring.

In these roller bearings, in order to suppress an increase in the surface pressure at the boundary between the first bus and the second bus having different radii of curvature, the two buses have a tangent at the boundary between the first bus and the second bus. A mode in which the third bus is formed so as to straddle a boundary between the first bus and the second bus may be adopted.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. Although roller bearings are shown in all the drawings, description and illustration of cages provided in these roller bearings are omitted for simplification of description.

First, a first embodiment of the roller bearing of the present invention will be described with reference to a symmetrical sectional view shown in FIG. The roller bearing 10 shown in FIG. 1 includes an outer race 11 having a concave raceway surface 15 on the inner peripheral surface and a flange 19 formed on the outer peripheral surface, and an inner race 16 having a concave raceway surface 17 on the outer peripheral surface. , Concave raceway surface 15 and concave raceway surface 1
And a plurality of rollers 13 arranged between the rollers 7. Also,
A convex rolling surface 14 is provided on the outer peripheral surface of the roller 13. A shaft 18 is attached to the inner peripheral surface of the inner race 16. The flange 19 has a bolt hole 97.
Are formed, and the bolt hole 97 and the housing 1
The roller bearing 10 is fixed to the housing 12 by screwing a bolt 99 into a bolt hole 98 formed in the housing 2.

The concave raceway surfaces 15 of the outer race 11 and the inner race 16,
17 and the combination of the convex rolling surfaces 14 of the rollers 13 are selected from the following (1) or (2).

(1) The convex rolling surfaces 14 are formed by a first bus bar and a second bus bar which are continuous with each other and have different radii of curvature, and a central portion of the convex rolling surface 14 is formed by each concave raceway surface 15. , 17, and both end sides of the convex rolling surface 14 are formed by a convex second bus bar having a smaller radius of curvature than the first bus bar. (2) The concave raceway surfaces 15 and 17 are formed by a first bus bar and a second bus bar that are continuous with each other and have different radii of curvature, and the center of the concave raceway surfaces 15 and 17 is a bus line of the convex rolling surface 14. And the end surfaces of the concave raceway surfaces 15 and 17 are formed by the first busbars corresponding to the first busbars.
It is formed by a concave second bus bar having a larger radius of curvature than the bus bar.

The concave raceway surfaces 15, 17 and the convex rolling surface 14 are not limited to those formed only by the first and second buses, but are formed by three or more types of buses. May be.

In the roller bearing 10 of the first embodiment,
In any of the above cases (1) and (2), the concave raceway surfaces 15 and 17 of the outer race 11 and the inner race 16 and
Since a relatively large gap is formed between the roller 13 and the end of the convex rolling surface 14, the outer ring 1 is smaller than the conventional type.
Even if a large axial misalignment occurs between the inner ring 1 and the inner ring 16,
No edge load or the like occurs. Therefore, when the roller bearing 10 is mounted on the housing 12, there is less consideration for misalignment than in the conventional type, so that the processing accuracy and the alignment of the shaft center with respect to the housing 12 can be simplified. The flange 19 eliminates the need to form a high-precision fitting hole in the housing 12 unlike the conventional type. As a result, the bolt holes 98 can be easily mounted simply by working the flanges 19 and the housing 12.

Two roller bearings 10 were mounted on the housing 12 and the shaft 18 so as to face each other. At this time, the distance between the two roller bearings 10 is 100 mm.
And Several mountings were performed, and when the respective axis misalignments were measured, a maximum axis misalignment of about 0.45 mm was confirmed. However, no major problem occurred even after long-term use. In the case of the conventional tapered roller bearing 100 shown in FIG. 6, the allowable inclination angle is 0.0009 rad, and if the distance between the bearings is 100 mm, the axial center deviation of 0.09 mm is the limit. It has been found that the use of the roller bearing 10 can tolerate at least about five times the axial misalignment. Therefore, it has been found that there is no problem even with a low-accuracy and simple mounting operation as compared with the conventional type.

Next, a second embodiment of the roller bearing of the present invention will be described with reference to a symmetrical sectional view shown in FIG. The roller bearing 20 shown in FIG. 2 is a modified embodiment of the first embodiment, and the same reference numerals are given to the same members. Also in the second embodiment, the concave raceway surfaces 15 and 17 and the convex rolling surface 14 are the same as those described in (1) above.
And (2) are selected.

The difference from the first embodiment lies in the configuration of the flange 29. While the roller bearing 10 of the first embodiment integrally forms the flange 12 with the outer ring 11, in the roller bearing 20 of the second embodiment, after the flange 29 is formed separately from the outer ring 11, It is attached to the outer race 11. The accuracy of the mounting surface between the outer ring 11 and the flange 29 is not required to be high by applying the present invention, so that the mounting can be easily performed. And
Also in the second embodiment, the same operation and effect as in the first embodiment can be obtained.

Next, a third embodiment of the roller bearing of the present invention will be described with reference to a symmetrical sectional view shown in FIG. The roller bearing 30 shown in FIG. 3 has an outer race 31 having a convex raceway surface 35 on the inner peripheral surface and a flange 39 formed on the outer peripheral surface, and an inner race having a convex raceway surface 37 on the outer peripheral surface. 36, the convex raceway surface 35 and the convex raceway surface 3
And a plurality of rollers 33 arranged between the rollers 7. Also,
A concave rolling surface 34 is provided on the outer peripheral surface of the roller 33. The shaft 18 is attached to the inner peripheral surface of the inner ring 36. Further, a bolt hole 98 is formed in the flange 39.
Are formed, and the bolt hole 97 and the housing 1
The roller bearing 30 is fixed to the housing 12 by screwing a bolt 99 into a bolt hole 98 formed in the housing 2.

The convex raceway surfaces 35 of the outer race 31 and the inner race 36,
37 and the combination of the concave rolling surfaces 34 of the rollers 33 are selected from the following (3) or (4).

(3) The concave rolling surfaces 34 are formed by a first bus bar and a second bus bar which are continuous with each other and have different radii of curvature, and a central portion of the concave rolling surface 34 is formed by each of the convex raceway surfaces 35, In addition to the first bus bar having a concave shape corresponding to the bus bar 37, both end sides of the concave rolling surface 34 are formed by a second bus bar having a radius of curvature larger than that of the first bus bar. (4) The convex raceway surfaces 35 and 37 are formed by a first bus bar and a second generatrix which are continuous with each other and have different radii of curvature, and the central portions of the convex raceway surfaces 35 and 37 are formed by the concave rolling surface 34. In addition to the first bus bar having a convex shape corresponding to the bus bar, the end surfaces of the convex raceway surfaces 35 and 37 are formed by the first bus bar.
It is formed by a convex second bus bar having a smaller radius of curvature than the bus bar.

The convex raceway surfaces 35 and 37 and the concave rolling surface 34 are not limited to those formed only by the first and second buses, but are formed by three or more types of buses. May be.

In the roller bearing 30 of the third embodiment,
In any of the above cases (3) and (4), the convex raceway surfaces 35 and 37 of the outer race 31 and the inner race 36,
Since a relatively large gap is formed between the roller 33 and the end portion side of the concave rolling surface 34, even if a large axial misalignment occurs between the outer ring 31 and the inner ring 36 as compared with the conventional type, the edge can be reduced. No load or the like occurs. Therefore,
The same operation and effects as those of the first and second embodiments can be obtained.

Next, a fourth embodiment of the roller bearing of the present invention will be described with reference to a symmetrical sectional view shown in FIG. The roller bearing 40 shown in FIG. 4 is a modified embodiment of the third embodiment, and the same reference numerals are given to the same members. Also in the fourth embodiment, the convex raceway surfaces 35 and 37 and the concave rolling surface 34 are the same as those described in (3) above.
And (4) are selected.

The difference from the third embodiment lies in the configuration of the flange 49. In the roller bearing 30 of the third embodiment, the flange 12 is integrally formed with the outer ring 31, whereas in the roller bearing 40 of the fourth embodiment, after the flange 49 is formed separately from the outer ring 31, It is attached to the outer race 31. The accuracy of the mounting surface between the outer race 31 and the flange 49 is not required to be high by applying the present invention, so that the mounting can be easily performed. And
Also in the fourth embodiment, the same operation and effect as those in the first to third embodiments can be obtained.

Next, a fifth embodiment of the roller bearing of the present invention will be described with reference to a symmetrical sectional view shown in FIG. The roller bearing 50 shown in FIG. 5 is a double row in which the roller bearings 10 of the first embodiment are opposed to each other. Outer ring 5
1 and the inner race 56 each have two concave raceway surfaces 5.
5, 57 are provided. Two concave raceway surfaces 55,5
7 are provided with a convex rolling surface 54 in each of them.
3 are arranged. Further, a flange 51 is formed on the outer peripheral surface of the outer ring 51, and the roller bearing 10 according to the first embodiment is formed.
Works as in. The shaft 18 is attached to the inner peripheral surface of the inner race 56. In addition, flange 5
9 has a bolt hole 98 formed therein.
The roller bearing 50 is fixed to the housing 12 by screwing a bolt 99 into the bolt hole 7 formed in the housing 12 and the bolt hole 98 formed in the housing 12.

As in the case of the first embodiment, the combination of the concave raceway surfaces 55 and 57 of the outer ring 51 and the inner ring 56 and the convex rolling surface 54 of the roller 53 can be any of the above (1) or (2). Is selected. Here, the concave raceway surface 5
The shapes of the convex raceway surfaces 5 and 57 and the convex raceway surfaces 54 are the same as the concave raceway surfaces 15 and 17 and the convex raceway surface 1 of the roller bearing 10 of the first embodiment.
It may be considered to be equal to the shape of No. 4.

In the roller bearing 50 of the fifth embodiment,
In any of the cases (1) and (2) described above, the concave raceway surfaces 55 and 57 of the outer race 51 and the inner race 56,
Since a relatively large gap is formed between the roller 53 and the end of the convex rolling surface 54, the same operation and effect as in the first embodiment can be obtained. Therefore, when the roller bearing 50 is mounted on the housing 12, consideration for the axial misalignment is smaller than that of the conventional type, so that the processing accuracy and the axis alignment with the housing 12 can be simplified. The flange 59 eliminates the need to machine the outer ring fitting hole in the housing 12 with high precision as in the conventional type. As a result, it is possible to easily attach the bolt holes 98 only by machining the flange holes 12.

Since the roller bearings 50 are designed so as to face each other from the beginning, there is no need to perform the operation of positioning the two roller bearings in the housing 12, respectively. Since there is no need for axial alignment, it can be easily attached by the flange 59.

[0040]

According to the roller bearing of the present invention, the center of one of the concave raceway surface and the convex rolling surface of the roller is formed by a first bus bar having a constant radius of curvature. Both ends adjacent to the portion are formed by a second generatrix having a radius of curvature that is separated from the other of the concave raceway surface and the convex rolling surface of the roller. The surface is characterized by having a flange for attachment to the housing, so that the allowable range for axial misalignment can be made larger than that of the conventional type. As a result, high-precision processing is not required for the housing, and therefore, when the housing is attached to the housing, the processing for the housing can be simplified, and further, the assembling work can be facilitated.

In the roller bearing according to the present invention, the center of one of the convex raceway surface and the concave rolling surface of the roller is formed by a first bus bar having a constant radius of curvature. Both ends adjacent to the portion are formed by a second generatrix having a radius of curvature such that they are separated from the other of the convex raceway surface and the concave rolling surface of the roller. The surface is characterized by having a flange for attachment to the housing, so that the allowable range for axial misalignment can be made larger than that of the conventional type. As a result, high-precision processing is not required for the housing, and therefore, when mounted on the housing, the processing for the housing can be simplified, and further, the assembling work can be facilitated.

[Brief description of the drawings]

FIG. 1 shows a symmetrical sectional view of a roller bearing according to a first embodiment of the present invention.

FIG. 2 shows a symmetrical sectional view of a roller bearing according to a second embodiment of the present invention.

FIG. 3 shows a symmetrical sectional view of a roller bearing according to a third embodiment of the present invention.

FIG. 4 shows a symmetrical sectional view of a roller bearing according to a fourth embodiment of the present invention.

FIG. 5 shows a symmetrical sectional view of a roller bearing according to a fifth embodiment of the present invention.

FIG. 6 shows a symmetrical sectional view of a conventional roller bearing.

[Explanation of symbols]

 10, 20, 30, 40, 50 Roller bearing 11, 31 Outer ring 12 Housing 13, 33 Roller 14 Convex rolling surface 15 Outer ring concave raceway surface 16, 36 Inner ring 17 Inner ring concave rolling surface 18 Shaft 19, 39 Flange 34 Roller concave rolling surface 35 Convex raceway surface of outer ring 37 Convex raceway surface of inner ring C Center axis of shaft

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J101 AA12 AA15 AA25 AA42 AA54 AA62 BA06 BA53 BA54 BA55 FA42 FA44

Claims (2)

[Claims] 1. An outer ring having a concave raceway surface on an inner peripheral surface, an inner ring having a concave raceway surface on an outer peripheral surface, and a plurality of rollers disposed between the concave raceway surfaces. In a roller bearing in which a convex rolling surface is provided on an outer peripheral surface of a roller, a center portion of one of the concave raceway surfaces and one of the convex rolling surfaces of the rollers has a constant radius of curvature. 1
A second bus bar formed by a bus bar and having a radius of curvature such that both end portions adjacent to the central portion are separated from the other of the concave raceway surfaces and the convex rolling surfaces of the rollers. And a flange provided on the outer peripheral surface of the outer ring for attachment to a housing. 2. An outer ring having a convex raceway surface on an inner peripheral surface, an inner ring having a convex raceway surface on an outer peripheral surface, and a plurality of rollers arranged between the convex raceways. In a roller bearing in which a concave rolling surface is provided on an outer peripheral surface of each roller, a center portion of one of the convex raceway surfaces and one of the concave rolling surfaces of each roller has a constant radius of curvature. First
A second radius formed by the generatrix and having a radius of curvature such that both end sides adjacent to the central portion are separated from the other of the convex raceway surfaces and the concave rolling surfaces of the rollers. A roller bearing, which is formed by a bus bar, and further has a flange for attachment to a housing on an outer peripheral surface of the outer ring.