KR20170059778A

KR20170059778A - Roller Bearing of Sealed Type

Info

Publication number: KR20170059778A
Application number: KR1020150164172A
Authority: KR
Inventors: 박영일; 박현섭
Original assignee: 제일베어링공업(주)
Priority date: 2015-11-23
Filing date: 2015-11-23
Publication date: 2017-05-31
Also published as: KR101825682B1

Abstract

The present invention relates to an inner ring having inner and outer circumferential raceways, An outer ring provided on the outer side of the inner ring and having an assembling groove formed along the inner circumferential surface at both ends of the spherical inner circumferential raceway surface; And a lower end portion attached to the inner surface of the slinger which is not in contact with the inner ring, so that foreign matter enters between the outer ring and the inner ring, A sealing member for sealing the sealing member; Wherein the seal includes an outer lip contacting the slope of the inner ring and an inner lip contacting the outer surface of the inner ring.
According to the embodiment of the present invention, the seals are provided in the outer ring of the spherical roller bearing having the self-aligning function and the axial both ends of the inner ring to maintain the self-aligning ability of the spherical roller bearing and maximize the sealing effect of the bearing, Thereby improving the performance and lifetime of the battery.

Description

[0002] Roller Bearing of Sealed Type [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical spherical roller bearing, and more particularly, to a spherical spherical roller bearing which is capable of maintaining an ideal lubrication condition of a bearing while maintaining an automatic self-aligning function and preventing a rolling contact surface from being damaged, To spherical roller bearings.

In general, the damage to bearings is largely due to poor lubrication. Typical failure modes of bearings include damage to the bearing surface, slip of the rolling elements, breakage of the oil film, rusting of the rolling contact surfaces, and most of the lubricating defects are caused by sealing problems of the bearing seals.

The bearing seal prevents the lubricant inside the bearing from leaking to the outside by intercepting the space between the inner ring and the outer ring where the ball is interposed from the outside, and is capable of preventing the leakage of dust, sand, Such as a lubricant or gas such as water vapor or gas, from entering the bearing, thereby maintaining the ideal lubrication condition of the bearing and preventing the rolling contact surface from being damaged, thereby extending the service life of the bearing.

These bearing seals can be largely divided into non-contact seals and contact seals.

Non-contact type seals are mainly used when there is no problem of foreign matter penetration because of low frictional resistance and good in high speed rotation but low in sealing performance.

The contact type seal is disadvantageous in high-speed rotation but is used mainly in cases where foreign matter penetration is problematic because of its excellent sealing performance.

Here, since the contact type seal acts on the sealing performance and the friction loss to each other, it influences the performance and the life of the bearing depending on how the contact surface pressure between the seal lip and the bearing contact face is designed It goes crazy. That is, when the contact force between the seal lip and the bearing contact face is large, friction and wear are severely advanced at the tip of the seal lip to shorten the life of the seal. If the contact force is small, It is very important that the contact force between the seal lip and the bearing contact surface and the shape of the seal lip are optimally designed because the lubricating condition between the raceway wheels is deteriorated and the life of the bearing is shortened.

As shown in FIG. 1, the spherical roller bearing is composed of an outer ring, an inner ring, a guide ring, a retainer, and a roller. Even if misalignment occurs due to the spherical outer ring raceway surface of the bearing, As a structural feature, it has automatic carefulness in the range of 1 to 2.5 °. In addition, high carbon chromium bearing steel (KS-STB2) is usually used for inner / outer ring and roller materials to increase durability and load capacity of bearings, and materials suitable for high load and environment are selected and used. Also, the inner ring structure is designed in the range of 4 to 18 degrees with respect to the vertical axis, and is used where the axial and radial composite loads act. In other words, the spherical roller bearing of the self-aligning function is geometrical structure characteristic, it is suitable for the place where the heavy load and heavy load are applied and the sagging or deflection of the shaft is also applied. .

However, the conventional spherical roller bearing has a problem in that the bearing seal described above can not be applied due to its structural characteristics.

Therefore, we intend to develop a spherical roller bearing with self-aligning function that improves the performance and life of the bearing.

Korean Published Patent: 10-2007-0110839 (Published on November 20, 2007)

Korean Registered Patent: 10-0795742 (Registered on Jan. 11, 2008)

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems,

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealed spherical roller bearing to which a seal is applied so as to improve the performance and life of the bearing while maintaining the self-aligning ability.

Another object of the present invention is to provide a non-contact lip and a mixed seal lip having a contact type lip to minimize the frictional resistance of the seal and improve the sealing performance of the bearing and to prevent the breakage of the seal by squeezing the slinger to the outside And to provide a seal type spherical roller bearing which improves the sealing performance and life of the bearing by applying a seal designed to improve the assemblability through a clamp type assembling structure.

According to an aspect of the present invention, there is provided a spherical spherical roller bearing comprising: an inner ring having sloped surfaces formed on outer circumferential surfaces at opposite ends of a spherical outer circumferential raceway surface; An outer ring provided on the outer side of the inner ring and having an assembling groove formed along the inner circumferential surface at both ends of the spherical inner circumferential raceway surface; And a lower end portion attached to the inner surface of the slinger which is not in contact with the inner ring, so that foreign matter is introduced between the outer ring and the inner ring, Wherein the seal includes an outer lip contacting the slope of the inner ring and an inner lip contacting the outer surface of the inner ring.

The inner lip of the seal has a contact depth of 0.15 mm to 0.2 mm with the outer peripheral surface of the inner ring.

The outer lip is parallel to an inclined surface of the inner ring, and the inner lip is perpendicular to the outer lip.

In addition, the seal is characterized in that the outer lip and the upper end of the inner lip are inclined at the same angle as the inner lip to provide a guiding portion for guiding lubricant transfer.

Further, the outer lip is connected to the guide portion by a curved surface (R) so as to have an elastic force.

In addition, an air flow groove is formed between the outer lip and the inner lip to form a spaced-apart space from the inner ring and to control a pressure difference between the outside and the inside.

According to the embodiment of the present invention, the seals are provided in the outer ring of the spherical roller bearing having the self-aligning function and the axial both ends of the inner ring to maintain the self-aligning ability of the spherical roller bearing and maximize the sealing effect of the bearing, Thereby improving the performance and lifetime of the battery.

Further, since the upper end of the slinger bent outwardly in the form of a clip is press-fitted into the mounting groove of the outer ring and is firmly fixed, the seal does not come out or come off, and the outer slinger protects the seal from being damaged by external force or external foreign material, It has an effect of improving the lifetime of the battery

In addition, the double lip structure of the outer lip contacting the inner ring and the inner lip contacting the inner ring effectively blocks penetration of foreign matter, and also has an effect of minimizing frictional resistance.

Further, the lubricating performance of the bearing is improved by guiding the flow of the lubricating oil to the raceway surface of the inner ring through the guiding portion of the seal and the inclination angle of the inner lip, thereby blocking the leakage of the lubricant.

In addition, by providing an air flow groove between the outer lip and the inner lip to provide a space for air to flow, the inner and outer pressure difference of the bearing can be controlled, thereby lowering the starting torque during the initial drive of the bearing, So that the surface pressure of the inner lip contacting the inner ring can be maintained.

In addition, by forming the labyrinth through the mixed lip of the non-contact lip and the contact lip, it is possible to improve the anti-vibration property and the sealing performance as well as to minimize the contact interference amount of the inner lip and minimize the frictional force and torque generated in the seal, It is possible to extend the service life.

1 is a conceptual diagram for explaining a spherical roller bearing of a general self-aligning function.
2 is a cross-sectional view of a sealed spherical roller bearing according to one embodiment of the present invention.
FIG. 3 is an enlarged view for explaining the structure of a seal in a spherical spherical roller bearing according to an embodiment of the present invention; FIG.
4 is an enlarged view for explaining an angle between an outer lip and an inner lip of a seal in a sealed spherical roller bearing according to an embodiment of the present invention;
5 is an enlarged view for explaining a guide surface for guiding the flow of lubricant to the raceway surface of the inner ring in the sealed spherical roller bearing according to the embodiment of the present invention.
6 is an enlarged view for explaining an air flow groove between an outer lip and an inner lip of a seal in a sealed spherical roller bearing according to an embodiment of the present invention;

These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. Hereinafter, a spherical spherical roller bearing according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. For purposes of this specification, like reference numerals in the drawings denote like elements unless otherwise indicated. In addition, the sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation

Referring to FIG. 2, a sealed spherical roller bearing according to an embodiment of the present invention will be described, and a structure of a seal in a spherical spherical roller bearing will be described in detail with reference to FIG. 5, the guide surface for guiding the flow of the lubricant to the raceway surface of the inner ring will be described with reference to Fig. 4. Referring to Fig. 6, the outer lip of the seal and the inner lip of the seal will be described with reference to Fig. And the air flow grooves between the inner ribs will be described.

2 to 3, the sealed spherical roller bearing of the present invention includes an outer ring 100, an inner ring 200, a roller 300, a cage 400, and a seal 500. Here, the structure of the sealed roller bearing has the same structure and features as the general self-aligning roller bearing, and the functions are the same.

A general description of a general self-aligning roller bearing is as follows.

First, the outer ring 100 has an inner circumferential surface which is entirely or partly spherical. The inner ring 200 has an outer circumferential surface having a radius of curvature equal to that of the inner circumferential surface of the outer ring in whole or in part. Here, the inner ring is designed in the range of 4 to 18 degrees with respect to the vertical axis when the rollers are two rows.

The inner ring 200 is rotated in a predetermined angle (for example, within a range of 0.5 deg.) Clockwise with respect to the outer ring 100 in a state of accommodating the rotating shaft, in a counterclockwise direction can do. Since the inner ring 200 is rotatable with respect to the outer ring 100, it is possible to accommodate the misalignment that occurs when the rotary shaft is engaged, without being affected by the bearing operation.

A plurality of rollers 300 are disposed between the inner circumferential surface of the outer ring 100 and the outer circumferential surface of the inner ring 200. The roller 300 has a spherical outer peripheral surface so as to rotate in contact with the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. At this time, the radius of curvature of the outer circumferential surface of the roller 300 is slightly smaller than the radius of curvature of the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring so that the roller 300 can smoothly rotate in contact with the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring.

A cage 400 for holding the roller 300 at a predetermined position is provided between the inner and outer rings. The cage 400 serves to uniformly distribute the load of the rollers to the inner ring and the outer ring raceway of the bearing, minimize friction heat and torque generated during rotation, and play an important role in low vibration and low noise.

According to the present invention, in a general spherical roller bearing, an assembly groove (110) is formed along the inner circumferential surface at both ends of the inner circumferential raceway surface of the outer race (100).

The inner ring 200 is formed with inclined surfaces 210 along the outer circumferential surface at both ends of the outer circumferential raceway surface.

A seal 500 is provided at both end openings of the inner ring 200 and the outer ring 100 in the axial direction.

The seal 500 is attached to one surface of the slinger 510 for fixing the seal, thereby blocking foreign matter from entering between the outer ring and the inner ring.

The upper end of the slinger 510 is bent outwardly in a clip shape so as to be press-fitted into an assembling groove of the outer ring by press-fitting, and the lower end of the slinger 510 is not in contact with the outer circumferential surface of the inner ring.

In addition, since the slinger 510 is made of a metal material, the seal is prevented from being damaged by an external force or an external foreign object, and the upper end bent outward in a clip form is pressed into the assembly groove 110 of the outer ring, Thereby minimizing problems of overcoming the problem or getting out of the assembly groove.

The seal 500 is divided into a body portion attached to one side of the slinger 510 and a lip portion not attached to the slinger 510 beyond the length of the slinger 510.

Here, the lip portion is connected to the body portion of the seal and is sealed by a gap (interference amount) with the relative contact movement surface.

The lip portion of such a seal is divided into an outer lip 520 which is not in contact with the inclined surface 210 of the inner ring and an inner lip 530 which is in contact with the outer peripheral surface of the inner ring 200 to improve the sealing performance.

3 to 5, the outer lip 520 is inclined toward the outer side of the inner ring so as to be parallel to the inclined surface 210 of the inner ring, and is not in contact with the inclined surface 210 of the inner ring.

The inner lip 530 is tilted toward the inner side of the raceway surface of the inner ring 200 so as to be perpendicular to the outer lip 520 and contacts the outer surface of the inner ring 200. At this time, the inner lip 530 has a contact depth d of 0.15 mm to 0.2 mm with the outer circumferential surface of the inner ring.

The upper end connecting the outer lip 520 and the inner lip 530 among the lip portions has a guide portion 540 for guiding the transfer of the lubricant oil by forming an inclined surface at the same angle as the inner lip 530.

The guide portion 540 guides the flow of the lubricant to the inclined surface of the inner lip 530 so that the lubricant flowing on the body of the seal 500 is guided to the raceway surface of the inner ring on the inclined surface of the inner lip 530.

The outer lip 520 is connected to the guide portion 540 by a curved surface R so as to have an elastic force.

6, an air flow groove 550 is formed between the outer lip 520 and the inner lip 530 to form a space between the inner lip and the inner ring so as to adjust the pressure difference between the outside and the inside of the bearing. .

The air flow groove 550 is formed in such a manner that the outer lip 520 does not contact the inclined surface 210 of the inner ring and the inner lip 530 contacts the outer peripheral surface of the inner ring 200, It controls the pressure difference.

Generally, bearings have a phenomenon in which seals are adsorbed as the internal pressure increases. When the internal temperature of the bearing rises, the moisture in the bearing or the pressure of the evaporated lubricant rises, and the lubricant in the bearing leaks to the outside due to the pressure difference between the inside and the outside. When the lubricant inside the bearing leaks, the foreign matter is absorbed from the outside in order to preserve the mass by the leaking amount, but the foreign matter is not introduced and the seal is adsorbed instead.

That is, when the pressure difference between the inside and the outside of the bearing is adjusted through the air flow grooves 550, the starting torque is lowered at the time of initial driving of the bearing, and the phenomenon that the seal is adsorbed does not occur, .

As described above, according to the present invention, the seal is provided at the outer ring of the spherical roller bearing having the automatic cauterizing function and the axial both ends of the inner ring to maintain the self-aligning ability of the spherical roller bearing and maximize the sealing effect of the bearing, The life can be improved.

In addition, since the upper end of the slinger 110 bent outward in a clip form is press-fitted into the mounting groove of the outer ring and is firmly fixed, the seal does not come out or fall off, and the outer slinger does not break the seal by external force or external foreign matter Protect.

Further, the double lip structure of the outer lip contacting the inner ring and the inner lip contacting the inner ring effectively blocks the penetration of foreign matter and minimizes the frictional resistance.

Further, the lubricating performance of the bearing is improved and leakage of the lubricant is prevented by guiding the flow of the lubricating oil to the raceway surface of the inner ring through the guide portion of the seal and the inclination angle of the inner lip.

In addition, by providing an air flow groove between the outer lip and the inner lip to provide a space for air to flow, the inner and outer pressure difference of the bearing can be controlled, thereby lowering the starting torque during the initial drive of the bearing, So that the surface pressure of the inner lip contacting the inner ring is maintained.

Although the preferred embodiments of the present invention have been described, the present invention is not limited to the specific embodiments described above. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the appended claims, And equivalents may be resorted to as falling within the scope of the invention.

100: outer ring 110: assembly groove
200: inner ring 210:
300: roller 400: cage
500: seal 510: slinger
520: outer lip 530: inner lip
540:
550: air flow groove

Claims

An inner ring having sloped surfaces formed along outer peripheral surfaces at both ends of the spherical outer peripheral raceway surface;
An outer ring provided on the outer side of the inner ring and having an assembling groove formed along the inner circumferential surface at both ends of the spherical inner circumferential raceway surface; And
The upper end is bent outwardly in the form of a clip and press-fitted into the fitting groove of the outer ring, and the lower end is attached to the inner surface of the slinger that is not in contact with the inner ring so that foreign matter enters between the outer ring and the inner ring A seal to seal the one;
Wherein the seal includes an outer lip that is not in contact with an inclined surface of the inner ring and an inner lip that is in contact with an outer circumferential surface of the inner ring.

The method according to claim 1,
Wherein the inner lip of the seal has a contact depth of 0.15 mm to 0.2 mm with the outer circumferential surface of the inner ring.

The method according to claim 1,
Wherein the outer lip is parallel to an inclined surface of the inner ring and the inner lip is perpendicular to the outer lip.

The method of claim 3,
Wherein the seal further comprises a guide portion for guiding the transfer of the lubricant to the upper lip and the upper end of the inner lip, the guide portion being inclined at the same angle as the inner lip.

5. The method of claim 4,
Wherein the outer lip is connected to the guide portion by a curved surface (R) so as to have an elastic force.

The method according to claim 1,
Wherein an air flow groove is formed between the outer lip and the inner lip to form a space for separating the inner ring from the outer lip and to control a pressure difference between the outside and the inside of the spherical roller bearing.