KR101901923B1 - Sealing Structure of Roller Bearing - Google Patents

Abstract

The present invention relates to an inner ring having an inclined surface formed along an outer circumferential surface at both ends of a spherical outer circumferential raceway surface and a groove formed along an outer circumferential surface of the inner ring adjacent to an upper end of the inclined surface; An outer ring provided on an outer side of the inner ring and having an assembly groove for fixing the seal along both side surfaces thereof; A seal lip which is press-fitted into one end of the outer ring and an inner ring of the outer ring so that the other end is not in contact with the raceway surface of the inner ring so as to shield the outer ring and the inner ring; A seal comprising a slinger to complement structural strength,
A sealing lip of the seal is fixedly inserted into and fixed to an assembly groove of the outer ring, an extending lip extending perpendicularly from the fixed lip to shield the inner ring and the outer ring, And an inner lip which is inserted into the groove of the inner ring in a noncontact manner to minimize a contact torque with the raceway surface of the inner ring and guide the flow of the lubricant to prevent the lubricant from leaking. The present invention provides a sealing structure of a sealed roller bearing.

Description

Sealing Structure of Roller Bearing [0002]

[0001] The present invention relates to a sealing structure of a sealed roller bearing, and more particularly, to a sealing structure of a sealed roller bearing which is capable of improving the performance and life of a bearing and maintaining a self- To a sealing structure of a sealed roller bearing.

As shown in FIG. 1, the roller bearing is constituted by an outer ring, an inner ring, a guide ring, a retainer, and a rolling body. Even if misalignment occurs due to the spherical outer ring raceway surface of the bearing, In the range of 1 to 2.5 degrees. 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 roller bearings with self-aligning feature are geometric structures that are suitable for applications where the radial load capacity is large, heavy loads and impact loads are applied, and where shaft deflection or deflection is also applied .

However, in roller bearings, a considerable portion of various damages are caused by poor lubrication, which can easily damage the rolling contact surfaces such as damage to the bearing track surface, slippage of the rolling elements, destruction of the oil film, and rubbing.

However, conventional roller bearings have not been able to apply bearing seals to prevent poor lubrication due to their structural characteristics. That is, there is a problem that sealing system and seal can not be applied due to many constraints such as the structure of the seal due to the structural problem of the roller bearing, the contact portion contact force, the seal fixing portion, and the interference portion.

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 rolling element is interposed from the outside, and it is possible to prevent the lubricant inside the bearing from leaking out from the outside of the bearing, such as dust, sand, scale, dust, 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.

Such a bearing seal can be divided into a contact seal in the form of a flat seal in which the tip of the seal lip contacts the side face of the inner ring in the axial direction and an oil seal type contact seal in contact with the inside of the inner ring.

If the axial contact force is designed to be large at the contact surface of the seal, frictional wear and abrasion are severely advanced at the tip of the seal lip, thereby significantly shortening the seal life. If the contact force is small, It is necessary to develop the design technique, analysis technique, and shape optimization design technique related to the contact force of the seal lip, since the lubricating condition between the bearing ring and the raceway is deteriorated and the bearing life is shortened.

Therefore, structural improvement of the roller bearing and structural improvement of the bearing seal are required to apply the bearing seal for solving the lubrication failure to the roller bearing, and the sealing structure of such a roller bearing is desired to be developed.

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 sealing type roller bearing sealing structure for solving constraints of sealing application of a self-aligning type roller bearing to maintain a self-aligning function and prevent leakage of lubricant, I have to.

It is another object of the present invention to solve the problem with the contact surface which contacts during rotation of the seal, to improve the structure of the seal fixing part to enable easy and simple assembling and to improve the structural strength of the seal fixing part, The present invention provides a sealed roller bearing sealing structure that improves the assembling force.

According to an aspect of the present invention, there is provided a sealing structure of a sealed roller bearing according to an embodiment of the present invention. The sealing structure of the sealing roller bearing includes sloped surfaces formed along outer circumferential surfaces at both ends of a spherical outer circumferential surface, An inner ring having a groove formed along an outer circumferential surface thereof; An outer ring provided on an outer side of the inner ring and having an assembly groove for fixing the seal along both side surfaces thereof; A seal lip which is press-fitted into one end of the outer ring and an inner ring of the outer ring so that the other end is not in contact with the raceway surface of the inner ring so as to shield the outer ring and the inner ring; A seal comprising a slinger to complement structural strength,

A sealing lip of the seal is fixedly inserted into and fixed to an assembly groove of the outer ring, an extending lip extending perpendicularly from the fixed lip to shield the inner ring and the outer ring, And an inner lip which is inserted into the groove of the inner ring in a noncontact manner to minimize a contact torque with the raceway surface of the inner ring and guide the flow of the lubricant to prevent the lubricant from leaking. do.

The mounting groove of the outer ring is formed with first and second stopping protrusions on both sides of the inlet to prevent the detachment of the fixed stopper, and the fixed stopper is protruded to be engaged with the first stopping protrusion when inserted into the mounting recess And the bending portion is inserted in a state of being pushed by the second hooking jaw by the elastic force when the hooking portion is inserted into the hooking groove, and when the insertion is completed, the second hooking jaw As shown in Fig.

Further, the outer lip is parallel to an inclined surface of the inner ring, and the inner lip has an inclination of an angle perpendicular to the outer lip.

In addition, the lower end of the extended lip is provided with a guide portion for guiding the lubricant to the inner raceway surface of the inner ring, and the guide portion has a slope equal to the slope of the inner lip, and is connected to the inner lip through a curved surface. do.

The outer lip parallel to the inclined surface of the inner ring is curved (R) connected to minimize the contact torque with the inclined surface of the inner ring when the inner ring performs a guiding function, so that elasticity is imparted.

The groove of the inner ring has an inclined inner wall for preventing the lubricant from leaking.

In addition, the slinger is pressed to the outer side of the extended lip to compensate for the structural strength of the seal lip, and the upper end is bent within a range not contacting the mounting groove of the outer ring, And the lower end is bent toward the inner lip within the range.

Further, the slinger and the extended rib are formed with bent grooves bent to protrude inward from one point of the central portion in order to reinforce the structural strength of the seal lip.

According to the embodiment of the present invention, it is possible to improve the shape of the assembly groove formed in the outer ring and the structure of the seal fixing, thereby making it possible to easily and easily assemble the seal, improve the assembling force so as to prevent the seal from being detached, The strength is complemented to prevent the breakage of the seal and increase the life span.

Since the outer lip and the inner lip are formed in a noncontact manner with the inner ring, thermal stress and deterioration of the seal do not occur. The double lip of the outer lip and the inner lip prevents the lubricant from leaking to the outside, It is possible to prevent intrusion, thereby maintaining the ideal lubrication condition of the bearing.

In addition, the present invention solves the constraint condition of the seal application of the self-aligning roller bearing, thereby solving the problem of damage to the bearing surface of the bearing caused by the lubrication failure, slip of the rolling member, breakage of the oil film, .

In addition, there is an effect of improving the performance and life of the bearing by maximizing the sealing effect of the bearing while maintaining the self-aligning ability of the roller bearing.

1 is a conceptual diagram for explaining a spherical roller bearing of a general self-aligning function.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a seal roller bearing,
3 is a partially enlarged perspective view illustrating a sealing structure of a sealed roller bearing according to an embodiment of the present invention.
4 is a partially enlarged cross-sectional view illustrating a sealing structure of a sealed roller bearing according to an embodiment of the present invention.
5 is a partially enlarged cross-sectional view of FIG.
FIG. 6 is a partially enlarged cross-sectional view for explaining a coupling structure of an assembly groove of the outer ring and a seal fixing in the enlarged sectional view of FIG. 5; FIG.
Fig. 7 is a partially enlarged cross-sectional view for explaining the relationship between the inclined surface of the inner ring and the outer lip and the relationship between the inner ring and the groove of the inner ring in the enlarged sectional view of Fig. 5;

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 sealing structure of a sealed 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 constituent elements shown in the drawings may be exaggerated for clarity and convenience of explanation.

2 and 3, a sealing roller bearing according to an embodiment of the present invention will be described, and a sealing structure of a sealed roller bearing according to an embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. Referring to FIG. 7, a description will be given of a coupling structure and an engagement relationship between an assembly groove of the outer ring and the seal fixing by referring to FIG. 6, and the relationship between the inclined surface and the outer lip of the inner ring, And the relationship between the outer lip and the inner lip will be described in detail.

2 to 4, the sealed 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 function is the same.

A brief description of the 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 200 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 100 and the outer peripheral surface of the inner ring 200. 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 100 and the outer circumferential surface of the inner ring 200 so that the roller 300 can smoothly rotate in contact with the inner circumferential surface of the outer ring 100 and the outer circumferential surface of the inner ring 200 And can slide on the inner circumferential surface of the outer ring 100 or on the outer circumferential surface of the inner ring 200. [

A cage 400 for holding the roller 300 at a predetermined position is provided between the inner ring 200 and the outer ring 100. The cage 400 plays an important role in distributing the load of the roller 300 uniformly to the raceway surface of the inner ring 200 and the outer ring 100 of the bearing and minimizing the friction heat and torque generated during rotation, do.

5 to 7, in the self-aligning type roller bearing according to the present invention, an assembly groove 110 for fixing the seal 500 along both side surfaces of the outer race 100 is formed.

At this time, when the side surface of the outer ring 100 is divided into the outer side surface portion 101 and the inner side surface portion 102 with reference to the mounting groove 110, the inner side surface portion 102 is positioned closer to the seal 500 than the outer surface of the outer side surface portion 101, As shown in FIG. When the seal 500 is inserted into the assembly groove 110, the outer surface of the outer side surface portion 101 of the outer ring 100 and the outer surface of the seal 500 are located on the same line or the outer surface of the outer side surface portion 101 of the outer ring 100 is sealed 500, respectively.

On both sides of the inlet of the assembly groove 110, first and second stopping protrusions 111 and 112 are formed to prevent the seals inserted into the assembly groove 110 from being separated.

The inner ring 200 is formed with a slope 210 along the outer circumferential surface at both side ends of the spherical outer circumferential raceway surface and a groove 220 along the outer circumferential surface adjacent to the upper end of the slope 210.

”형상으로 이루어진다. Here, the inner wall of the groove 220 is formed obliquely to prevent the lubricant from leaking to the outside. That is, the inner wall of the groove 220 is "

"Shape.

The seal 500 has a seal lip (not shown) which is press-fitted into the mounting groove 110 of the outer ring 100 and is fixed to the outer ring 100 and the other end is in contact with the raceway surface of the inner ring 200, And a slinger 520 which is pressed onto the outer side of the seal lip 510 to contact the outer ring 100 and the inner ring 200 to complement the structural strength of the seal lip 510.

The seal lip 510 includes a fixed lip 511 inserted and fixed in the fitting groove 110 of the outer ring 100 and an extending lip 530 extending vertically from the fixed lip 511 to shield the inner ring and the outer ring An outer lip 516 branched from the lower end of the extending lip 514 and not in contact with the inclined surface of the inner ring 513 and an inner lip 517 inserted into the groove of the inner ring in a noncontact manner.

6, the fixed portion 511 has a protrusion 512 formed to protrude from the first engaging protrusion 111 when the protrusion is inserted into the fitting groove 110 of the outer ring, The bending portion 513 is inserted into the second engaging jaw 112 in a pressed state by the elastic force when the bending portion 513 is inserted into the fitting groove 110 of the outer ring, 2 is released by the latching jaws 112 and fixed to the second latching jaws 112 by the restoring force of the bent portions 513.

The fixed part 511 of the seal 500 can be easily assembled to the assembly groove 110 by using the tension of the bending part 513 and the bending part 513 is fastened to the second stopping part 112 Therefore, it is not easily detached from the mounting groove 110, thereby improving assembling performance of the seal.

7, the outer ribs 516 branching from the lower end of the extended ribs 514 have an inclination toward the outer side so as to be parallel to the inclined surface 210 of the inner ring, and the inner ribs 517 have an outer lip 516 and is inserted into the grooves 220 of the inner ring in a noncontact manner.

Since the outer lip 516 and the inner lip 517 are formed in a noncontact manner with respect to the inner ring 200, thermal stress and deterioration of the seal do not occur, and the outer lip 516 and the inner lip 517, To prevent foreign matter such as dust, sand, scale, dust, liquids such as solid and moisture, contaminated lubricant, gas such as water vapor, gas from entering from the outside of the bearing Thereby maintaining the ideal lubrication condition of the bearing.

In addition, a guide portion 515 for guiding lubricant to the inner raceway surface of the inner ring 200 is provided at the lower end of the extended lip 514.

The guide portion 515 has a slope equal to the slope of the inner rib 517 and is curvedly connected to the inner rib 517. That is, the guide portion 515 guides the flow of the lubricant so that the guide portion 515 is guided to the raceway surface of the inner ring 200 on the inclined surface of the inner lip 517).

The outer lip 516 parallel to the inclined surface 210 of the inner ring 200 is curvedly connected to the guide portion 515 so that elasticity is imparted to the inner ring 200. When the inner ring 200 performs the self- Thereby minimizing the contact torque with the motor 210.

5, the slinger 520 is pressed against the outer surface of the elongate rib 514 to compensate for the structural strength of the seal lip 510. Further, the slinger 520 is made of a metal material, and prevents the seal from being damaged by external force or external foreign matter.

The upper end of the slinger 520 pressed on the outer surface of the extended rib 514 is bent within a range not contacting the fitting groove 110 of the outer ring 100 to reinforce the strength of the fixed rib 511, Is bent toward the inner rib 517 within a range not contacting the inner ring 200 to reinforce the strength of the guide portion 515. [

Further, the slinger 520 and the extended ribs 514 are formed by bending grooves 530 that are bent so as to protrude inward from one point of the central portion to reinforce the structural strength of the seal.

As described above, according to the present invention, it is possible to easily and easily assemble the seal by improving the shape of the assembly groove formed in the outer ring and the structure of the seal fixing, improving the assemblability so that the seal does not come off, Thereby preventing damage to the seal and increasing the service life.

Since the outer lip and the inner lip are formed in a noncontact manner with the inner ring, thermal stress and deterioration of the seal do not occur. The double lip of the outer lip and the inner lip prevents the lubricant from leaking to the outside, Thereby preventing intrusion and maintaining the ideal lubrication condition of the bearing.

Further, the present invention solves the constraint condition of the seal application of the self-aligning type roller bearing, thereby solving the problem of damage to the rolling contact surfaces such as damage to the bearing raceway caused by poor lubrication, sliding of the rolling member, breakage of oil film, and rubbing.

In addition, it is possible to maintain the self-aligning ability of the roller bearing, maximize the sealing effect of the bearing, and improve the performance and life of the bearing.

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 101: outer side surface
102: inner side portion 110:
111, 112: first and second stopping jaws 200: inner ring
210: sloped surface 220: groove
300: roller 400: cage
500: Seal 510: Seal lip
511: Fixation 512: Prong
513: Bending section 514: Extension lip
515: guide portion 516: outer lip
517: Inner lip 520: Slinger
530: Bending groove

Claims (8)

An inner ring having sloped surfaces formed along the outer circumferential surface at both ends of the outer circumferential raceway surface of the spherical shape and grooves formed along the outer circumferential surface adjacent to the upper end of the inclined surface; An outer ring provided on an outer side of the inner ring and having an assembly groove for fixing the seal along both side surfaces thereof; A seal lip which is press-fitted into one end of the outer ring and an inner ring of the outer ring so that the other end is not in contact with the raceway surface of the inner ring so as to shield the outer ring and the inner ring; A seal comprising a slinger to complement structural strength,
A sealing lip of the seal is fixedly inserted into and fixed to an assembly groove of the outer ring, an extending lip extending perpendicularly from the fixed lip to shield the inner ring and the outer ring, And an inner lip which is inserted into the groove of the inner ring in a noncontact manner.
Wherein the inner lip has a slope at an angle perpendicular to the outer lip and a slope equal to the slope of the inner lip is formed at a lower end of the extended lip And an outer lip which is connected to the inner lip by a curved surface to guide the transfer of the lubricant oil to the inner raceway surface of the inner ring, wherein an outer lip which is parallel to the inclined surface of the inner ring, (R) connected to the guide portion so as to minimize contact torque, and elasticity is imparted to the guide portion,
Wherein the groove of the inner ring has an inclined inner wall to prevent leakage of the lubricant. The method according to claim 1,
The first and second stopping protrusions for preventing the detachment of the fixed fastener are formed on both sides of the inlet,
Wherein the fastener is composed of a jaw protruding from the first engaging jaw when the fastener is inserted into the mounting groove and a bending portion bent from the jaw to be elastically biased,
Wherein the bending portion is inserted in a state where the bending portion is pushed by the second stopping jaw by the elastic force when the bending portion is inserted into the mounting groove and is fixed by being fixed to the second stopping jaw by the restoring force when the insertion is completed. delete delete delete delete The method according to claim 1,
The slinger is press-fitted to the outer side of the extended lip to compensate for the structural strength of the seal lip. The slinger is bent in a range in which it is not in contact with the mounting groove of the outer ring, And the lower end is bent toward the inner lip. 8. The method of claim 7,
Wherein the slinger and the elongated rib are formed with bent grooves bent to protrude inward from one point of the center portion in order to reinforce the structural strength of the seal lip.

Images