KR102580857B1 - Rolling bearing having improved sealing function - Google Patents

Abstract

According to one embodiment of the present invention, a rolling bearing is provided that rotatably supports a rotating element with respect to a non-rotating element in a rotating device. A rolling bearing according to an embodiment of the present invention includes an inner ring on which the inner raceway of the rolling element is formed on the outer peripheral surface, an outer ring mounted on the radial outer side of the inner ring and on which the outer raceway of the rolling element is formed on the inner peripheral surface, and a space between the inner ring and the outer ring. It may include a rolling element that is seated and mounted on the rolling element, a cage that accommodates and supports the rolling element, and a sealing member that is mounted on both ends of the rolling bearing between the inner ring and the outer ring. According to one embodiment of the present invention, the sealing member may be formed in a structure in which an elastic sealing part is coupled to a frame, and the elastic sealing part includes a first sealing part formed at one end of the frame and a second sealing part formed at the other end. It can be configured to include: According to one embodiment of the present invention, the first sealing part is inserted and mounted in a coupling groove formed on the outer peripheral surface of the outer ring, and the second sealing part includes a first sealing lip, a second sealing lip, and a third extending in different directions from the frame. It may be configured to include a sealing lip. According to an embodiment of the present invention, the first sealing lip may be configured to perform non-contact sealing with the inner ring, the second sealing lip and the third sealing lip may be configured to perform contact sealing with the inner ring, and the third sealing lip may be configured to perform contact sealing with the inner ring. It may be provided with a contact protrusion protruding toward the inner ring so that contact sealing with the inner ring is performed by the contact protrusion.

Description

Rolling bearing with improved sealing function {Rolling bearing having improved sealing function}

The present invention relates to a rolling bearing that supports a rotating element in a rotating device by rotatably mounting it with respect to a non-rotating element. More specifically, the present invention relates to a rolling bearing that improves the sealing performance by improving the structure of the sealing member mounted between the inner and outer rings of the rolling bearing. It is about improved rolling bearings.

Bearings are devices that are mounted between rotating and non-rotating elements in a rotating device to assist relative motion between the rotating and non-rotating elements. Depending on the way the bearing and the shaft contact, they can be divided into sliding bearings and rolling bearings. .

Among these, rolling bearings are bearings that support a rotating shaft using rolling elements such as balls or rollers. They have the advantage of lower frictional resistance compared to sliding bearings that directly contact part of the shaft, so they are used in various fields. Depending on the shape of the rolling element, it is used in the form of ball bearings, tapered roller bearings, needle bearings, etc.

Meanwhile, the bearing operates with lubricant filled inside to ensure smooth relative motion between the rotating and non-rotating elements, and sealing members are installed on both ends of the bearing to prevent the lubricating oil inside the bearing from leaking to the outside or leaking from the outside. It is designed to prevent foreign substances from entering the bearing.

If the lubricating oil inside the bearing leaks to the outside or foreign substances enter the bearing, the rolling elements or raceway surfaces may be worn or damaged during the operation of the bearing, which may cause problems in deteriorating the performance and life of the bearing. Sealing members are recognized as one of the most important members in determining the performance and lifespan of bearings, and in the bearing field, research and development is continuously being conducted to improve the performance of these sealing members.

As a way to improve the performance of the sealing member mounted on the bearing, Patent Document 1 states that two non-contact sealing lips and one contact sealing lip are formed in the sealing member mounted between the inner and outer rings to improve the sealing performance of the bearing. Improvement technology has been disclosed.

However, since the sealing member disclosed in Patent Document 1 performs most of the sealing relying on one contact sealing lip in contact with the inner ring, if this contact sealing lip is worn or damaged, the sealing performance of the bearing rapidly deteriorates. there is a problem.

In order to prevent this deterioration in the performance of the sealing member and provide improved sealing performance, it is possible to consider forming a greater number of contact-type sealing lips on the sealing member. However, having more sealing lips in contact with the inner or outer ring may be considered. When sealing is performed, the friction force increases at the contact area of the contact sealing lip, which causes the friction torque to increase and frictional heat to increase during bearing operation, resulting in a decrease in the performance and life of the bearing.

Japanese Patent Publication No. 2003-227521 (Publication date: August 15, 2003)

The present invention is intended to solve the above-mentioned problems of conventional rolling bearings, and provides a rolling bearing that can effectively improve the sealing performance of the sealing member without significantly increasing the friction force generated at the contact portion of the sealing member when the bearing rotates. The purpose is to

A representative configuration of the present invention to achieve the above-described object is as follows.

According to one embodiment of the present invention, a rolling bearing is provided that rotatably supports a rotating element with respect to a non-rotating element in a rotating device. A rolling bearing according to an embodiment of the present invention includes an inner ring on which the inner raceway of the rolling element is formed on the outer peripheral surface, an outer ring mounted on the radial outer side of the inner ring and on which the outer raceway of the rolling element is formed on the inner peripheral surface, and a space between the inner ring and the outer ring. It may include a rolling element that is seated and mounted on the rolling element, a cage that accommodates and supports the rolling element, and a sealing member that is mounted on both ends of the rolling bearing between the inner ring and the outer ring. According to one embodiment of the present invention, the sealing member may be formed in a structure in which an elastic sealing part is coupled to a frame, and the elastic sealing part includes a first sealing part formed at one end of the frame and a second sealing part formed at the other end. It can be configured to include: According to one embodiment of the present invention, the first sealing part is inserted and mounted in a coupling groove formed on the inner peripheral surface of the outer ring, and the second sealing part includes a first sealing lip, a second sealing lip, and a third extending in different directions from the frame. It may be configured to include a sealing lip. According to an embodiment of the present invention, the first sealing lip may be configured to perform non-contact sealing with the inner ring, the second sealing lip and the third sealing lip may be configured to perform contact sealing with the inner ring, and the third sealing lip may be configured to perform contact sealing with the inner ring. It may be provided with a contact protrusion protruding toward the inner ring so that contact sealing with the inner ring is performed by the contact protrusion.

According to one embodiment of the present invention, a recess having a recessed structure may be provided on the surface opposite to the surface of the third sealing lip where the contact protrusion is formed.

According to one embodiment of the present invention, the recess may be formed only partially along the longitudinal direction of the third sealing lip.

According to one embodiment of the present invention, the minimum thickness of the third sealing lip may be 0.1 mm to 0.3 mm.

According to one embodiment of the present invention, the recess may be formed continuously along the circumferential direction of the rotation axis.

According to one embodiment of the present invention, a plurality of recesses may be formed to be spaced apart along the circumferential direction of the rotation axis.

According to one embodiment of the present invention, the recessed depth of the recess may be formed to be equal to the protrusion length of the contact protrusion.

According to one embodiment of the present invention, a plurality of contact protrusions of the third sealing lip may be formed to be spaced apart along the circumferential direction of the rotation axis.

According to one embodiment of the present invention, a recess having a recessed structure may be provided at a position corresponding to the contact protrusion on a surface of the third sealing lip opposite to the surface where the contact protrusion is formed.

According to one embodiment of the present invention, the recess may be formed only partially along the longitudinal direction of the third sealing lip.

According to one embodiment of the present invention, the minimum thickness of the third sealing lip may be 0.1 mm to 0.3 mm.

According to one embodiment of the present invention, the recessed depth of the recess may be formed to be equal to the protrusion length of the contact protrusion.

According to one embodiment of the present invention, the first sealing lip may be provided with a non-contact protrusion at an end protruding in the direction of the inner ring so that a labyrinth structure is formed between the non-contact protrusion and the inner ring.

According to one embodiment of the present invention, the inner surface of the first sealing lip may be formed as a concave curved surface.

According to one embodiment of the present invention, the elastic sealing part further includes a side sealing part provided on the outer surface of the frame, and the side sealing part may be provided with a side protruding part protruding outward.

According to one embodiment of the present invention, the radial outer surface of the side protrusion may be formed as an inclined surface.

In addition to this, the rolling bearing according to the present invention may further include other additional components without impairing the technical spirit of the present invention.

The rolling bearing according to an embodiment of the present invention provides improved sealing performance compared to conventionally known rolling bearings by forming a sealing member mounted between the inner and outer rings in a structure that combines a plurality of contact sealing lips and non-contact sealing lips. You can do it.

In addition, the rolling bearing according to an embodiment of the present invention reduces the thickness by forming recesses in some of the contact sealing lips, or is configured so that contact occurs only in some areas, thereby reducing sealing due to the addition of contact sealing lips. While improving performance, problems with increased friction and torque caused by contact sealing lips can be suppressed as much as possible.

In addition, the rolling bearing according to an embodiment of the present invention forms a protrusion on the non-contact sealing lip that can narrow the space formed between the end of the sealing lip and the inner ring, forming a more complicated labyrinth structure by the non-contact sealing lip, thereby reducing the internal lubricant. Leakage or intrusion of foreign substances can be prevented more effectively.

In addition, the rolling bearing according to an embodiment of the present invention is provided with a side protrusion that protrudes outward on the outer surface of the sealing member, and the side protrusion guides external foreign matter toward the outside of the bearing, thereby preventing foreign matter from entering the bearing. Risks can be prevented more effectively.

In addition, the rolling bearing according to an embodiment of the present invention is configured to secure a wider space inside the bearing by forming the inner surface of the sealing lip located in the inner direction into a concave curved surface, thereby allowing more space inside the bearing. of lubricating oil can be retained, thereby improving the operability and lifespan of the bearing.

1 exemplarily shows the structure of a rolling bearing according to an embodiment of the present invention.
2 and 3 exemplarily show the cross-sectional structure of a rolling bearing according to an embodiment of the present invention.
Figure 4 exemplarily shows the structure of a sealing member that can be applied to a rolling bearing according to an embodiment of the present invention.
Figure 5 exemplarily shows the structure of a sealing member applicable to a rolling bearing according to an embodiment of the present invention (partial cross-sectional view).
6 and 7 exemplarily show a modified example of a sealing member applicable to a rolling bearing according to an embodiment of the present invention (partial cross-sectional view).

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that a person skilled in the art can easily implement the present invention.

In order to clearly explain the present invention, detailed descriptions of parts unrelated to the present invention will be omitted, and like elements will be described with the same reference numerals throughout the specification. In addition, the shape and size of each component shown in the drawings are arbitrarily drawn for convenience of explanation, and the present invention is not necessarily limited to the shape and size shown. That is, the specific shape, structure, and characteristics described in the specification may be modified and implemented from one embodiment to another without departing from the spirit and scope of the present invention, and the location or arrangement of individual components may also be implemented within the spirit and scope of the present invention. It should be understood that changes can be made without departing from the scope. Accordingly, the detailed description described below is not intended to be limited, and the scope of the present invention should be taken to encompass the scope claimed by the claims and all equivalents thereof.

Preferred Embodiments of the Invention

1 to 7, a rolling bearing 10 according to an embodiment of the present invention is shown by way of example. As will be described later, the rolling bearing 10 according to an embodiment of the present invention improves the sealing performance of the bearing by improving the structure of the sealing member 50 mounted between the inner ring 20 and the outer ring 30. It has unique characteristics.

Specifically, the rolling bearing 10 according to an embodiment of the present invention includes an inner ring 20 located on the radial inner side, an outer ring 30 located on a radial outer side of the inner ring 20, and an inner ring 20. A rolling element 40 placed between the rolling element 40 and the outer ring 30, a cage 45 that accommodates and supports the rolling element 40, and an inner ring 20 and an outer ring 30 at both ends of the rolling bearing 10. It may be composed of a sealing member 50 mounted between them.

The inner ring 20 is configured to be press-fitted and mounted on the outer peripheral surface of the rotating shaft, and may be configured to support the rolling element 40 from the inside through a raceway surface (inner raceway surface 22) formed on the outer peripheral surface. Additionally, grooves 24 may be provided at both ends of the inner ring 20 in the axial direction to perform a sealing function by interacting with a sealing member 50, which will be described later.

The outer ring 30 is mounted on the radial outer side of the inner ring 20 and is configured to be press-fitted into a housing, etc., and is configured to support the rolling element 40 from the outside through a raceway surface (outer raceway surface 32) formed on the inner peripheral surface. It can be. Additionally, both axial ends of the outer ring 30 may be provided with coupling grooves 34 into which a sealing member 50, which will be described later, can be inserted and mounted.

The rolling elements 40 are arranged at a predetermined interval by a cage 45 between the inner raceway surface 22 formed on the inner ring 20 and the outer raceway surface 32 formed on the outer ring 30, It performs the function of providing relative motion between the outer rings (30). To provide relative motion between the inner ring 20 and the outer ring 30, the rolling element 40 may be formed of a spherical ball or the like that can provide rolling motion.

The sealing member 50 is configured to be mounted on both ends of the rolling bearing 10 between the inner ring 20 and the outer ring 30 to prevent the lubricant filled inside the bearing from leaking to the outside or external foreign substances from entering the bearing. It performs a preventive function.

According to one embodiment of the present invention, the sealing member 50 may be composed of a frame 60 forming a basic body and an elastic sealing part 65 attached around the frame.

The frame 60 is a part that forms the basic skeleton of the sealing member 50. According to one embodiment of the present invention, the frame 60 may be formed in a substantially ring-shaped shape with the center penetrating, and the frame 60 ) The end portion may be formed in a bent structure so that the elastic sealing portion 65 is stably attached around the frame 60. For example, in the case of the embodiment shown in the drawing, the frame 60 is formed in an overall ring-shaped structure in which one end is bent at a substantially right angle and the other end is bent at an angle.

The elastic sealing portion 65 completely or partially surrounds the frame 60 and performs the function of sealing between the inner ring 20 and the outer ring 30. According to one embodiment of the present invention, the elastic sealing part 65 includes a first sealing part 70 formed at one end of the frame 60 and a second sealing part 80 formed at the other end of the frame 60. ) may be configured to include.

According to one embodiment of the present invention, the first sealing part 70 may be configured to seal the outer ring side of the bearing by being inserted into and fastened to the coupling groove 34 formed in the outer ring 30. Specifically, the first sealing portion 70 may be formed to be thick around one end of the frame 60 and configured to be inserted into and fixed to the coupling groove 34 of the outer ring 30.

Meanwhile, the second sealing part 80 may interact with the groove 24 formed on the inner ring 20 to seal the inner ring side of the bearing. According to an embodiment of the present invention, the second sealing part 80 has a contact type sealing lip that directly contacts the inner ring 20 to perform sealing and a non-contact type that performs sealing by being placed spaced apart from the inner ring 20. It can be configured to seal the inner ring side area through a combination of sealing lips.

According to one embodiment of the present invention, the second sealing part 80 includes a plurality of sealing lips extending in different directions from the frame 60 (a first sealing lip 82, a second sealing lip 84, and a first sealing lip 84). 3 sealing lips (86)], of which some of the sealing lips (e.g., the first sealing lip (82)) are composed of non-contact sealing lips that are spaced apart from the inner ring (20), and the remaining The sealing lips (eg, the second sealing lip 84 and the third sealing lip 86) may be configured as contact sealing lips that directly contact the inner ring 20 of the bearing to perform sealing.

According to one embodiment of the present invention, the first sealing lip 82 may be formed to extend from the frame 60 in a direction toward the inside of the bearing (e.g., a direction extending approximately along the rotation axis of the bearing). 1 The end of the sealing lip 82 is adjacent to the inner ring 20, but extends to a position that does not directly contact the inner ring 20, and may be configured to be arranged in a non-contact manner with the inner ring 20.

Meanwhile, according to one embodiment of the present invention, a non-contact protrusion 82a extending toward the inner ring 20 may be provided at the end of the first sealing lip 82. When this non-contact protrusion 82a is formed at the end of the first sealing lip 82, a narrower space is formed between the first sealing lip 82 and the inner ring 20, thereby forming a more complex labyrinth structure and sealing the bearing. performance can be further improved. The non-contact protrusions 82a formed on the first sealing lip 82 may be formed continuously along the circumference of the first sealing lip 82 (along the circumferential direction of the rotation axis), and a plurality of non-contact protrusions 82a may be formed on the first sealing lip 82. 1 It may be configured to be spaced apart along the circumference of the sealing lip 82 (along the circumferential direction of the rotation axis). However, in order for the first sealing lip 82 to operate in a non-contact manner with the inner ring 20, the non-contact protrusion 82a formed at the end of the first sealing lip 82 is arranged so that it is spaced apart from the inner ring 20. is formed.

According to one embodiment of the present invention, the inner surface of the first sealing lip 82 (the surface located toward the inner space formed by the inner ring 20 and the outer ring 30) may be formed as a curved surface with a concave structure. there is. In this way, when the inner surface 82b of the first sealing lip 82 is formed in a concave curved shape, a wider internal space is created between the inner ring 20 and the outer ring 30 compared to the case where the inner surface 82b of the first sealing lip 82 is formed with a straight surface. This allows more lubricant to be filled inside the bearing, thereby further improving the lubricating and operating characteristics of the bearing.

According to one embodiment of the present invention, the second sealing lip 84 is configured to extend from the frame 60 in a different direction from the first sealing lip 82, and directly contacts the inner ring 20 to perform contact sealing. It can be configured to perform. For example, the second sealing lip 84 may be configured to contact one side of the groove 24 formed in the inner ring 20 to perform contact sealing.

According to one embodiment of the present invention, the third sealing lip 86 extends from the frame 60 in a different direction from the first sealing lip 82 and the second sealing lip 84 to perform contact sealing with the inner ring 20. It can be configured to perform.

Specifically, the third sealing lip 86 is configured to extend from the frame 60 in one direction (e.g., in the case of the embodiment shown in the drawing, toward the outside of the bearing), and is located at an end of the third sealing lip 86. A contact protrusion 86a extending toward the inner ring 20 may be provided.

In this way, since the sealing member 50 according to an embodiment of the present invention performs sealing in a contact manner by contacting the inner ring with a plurality of sealing lips, the sealing performance of the sealing member can be further improved. However, if sealing is performed by contacting the inner ring with a plurality of sealing lips in this way, friction increases at the contact area when the bearing rotates, which increases frictional torque and frictional heat, which may deteriorate the performance and life of the bearing.

In order to prevent this problem, the sealing member 50 according to an embodiment of the present invention has a recess 86b on one side of the third sealing lip 86 (the side opposite to the surface on which the contact protrusion 86a is formed). ) may be configured to reduce the thickness of the sealing lip 86. In this way, when the recess 86b is formed on one side of the third sealing lip 86, the thickness of the third sealing lip 86, which operates in a contact manner, is reduced, thereby forming the third sealing lip 86 and the inner ring ( 20) The friction and torque generated when the bearing rotates can be reduced by the contact between them. The recess 86b formed in the third sealing lip 86 may be configured to be spaced apart along the circumference of the third sealing lip 86 (along the circumferential direction of the rotation axis) as shown in FIG. 5. It may be configured to be formed continuously along the circumference of the third sealing lip 86 (along the circumferential direction of the rotation axis).

However, if the recess 86b is formed in the third sealing lip 86 in this way, it is possible to prevent the friction torque and friction heat from increasing due to the contact sealing lip, but the recess 86b increases the friction of the sealing lip. As the thickness becomes thinner, problems such as deterioration of the sealing function or tearing of the sealing lip when separating it from the mold may occur.

To prevent this problem, the sealing member 50 according to an embodiment of the present invention may be configured such that the recess 86b is formed only partially along the longitudinal direction of the third sealing lip 86. For example, in the sealing member 50 according to an embodiment of the present invention, the recess 86b is partially formed only from the end of the third sealing lip 86 to a predetermined area, and as shown in FIG. 4, the recess 86b is partially formed only in a predetermined area. In some parts, the third sealing lip 86 may be formed to have a thin thickness t1, and in the remaining parts, the third sealing lip 86 may be formed to have a thicker thickness t2.

According to this configuration, the thickness of the third sealing lip 86 is thinned due to the recess (86b) structure formed at the end, thereby reducing friction and torque generated when the bearing rotates, and at the same time, in the inner part connected to the center, The third sealing lip (86) can maintain a predetermined thickness, preventing the sealing lip from being torn when manufacturing a sealing member or the sealing function of the third sealing lip (86) being deteriorated due to the thickness of the sealing lip being too thin. It becomes possible.

Meanwhile, in order to sufficiently provide the effect of reducing frictional torque and frictional heat by the recess 86b, the sealing member 50 according to an embodiment of the present invention has a minimum thickness t1 of the third sealing lip 86 [ That is, it may be desirable for the thickness between the bottom surface of the recess 86b and the opposite side on which the contact protrusion 86a is not formed to be 0.1 mm to 0.3 mm thick.

Meanwhile, referring to FIGS. 6 and 7, another method for solving the problem of increased friction and torque due to an increase in the contact sealing lip is shown as an example.

For example, the third sealing lip 86 has a contact protrusion 86a formed at the end of the third sealing lip 86 as shown in FIG. 6 to solve the problem of increased friction and torque due to an increase in the contact sealing lip. ) may not be formed continuously along the circumference of the third sealing lip 86 (along the circumferential direction of the rotation axis) but may be formed spaced apart at predetermined intervals along the circumference. In this way, when the plurality of contact protrusions (86a) are arranged spaced apart along the circumference of the third sealing lip (86), the third sealing lip (86) only partially contacts the inner ring (20), thereby reducing friction and torque. The increase can be suppressed.

In addition, the third sealing lip 86 has a plurality of contact protrusions 86a at the end of the third sealing lip 86 as shown in FIG. 7 to solve the problem of increased friction and torque due to an increase in the contact sealing lip. ) are disposed spaced apart along the circumference of the third sealing lip 86 (along the circumferential direction of the rotation axis) at a position corresponding to the contact protrusion 86a on the surface opposite to the surface on which the contact protrusion 86a is formed. It may be configured to form a recess (86b). According to this structure, the recess 86b is formed in the area where the thickness of the sealing lip increases by the contact protrusion 86a, thereby preventing the thickness of the sealing lip from increasing significantly, thereby reducing friction and friction caused by the third sealing lip. Torque increase problems can be prevented.

Meanwhile, according to one embodiment of the present invention, the depth of the recess 86b provided in the third sealing lip 86 is adjusted to protrude the contact protrusion 86a so as to offset the increase in thickness due to the contact protrusion 86a. It can be formed with a depth corresponding to the length.

In this way, in the rolling bearing 10 according to an embodiment of the present invention, the contact protrusion 86a formed on the third sealing lip 86 directly contacts the inner ring 20 to form a contact sealing, thereby forming a second sealing lip ( By complementing the sealing function of 84), the overall sealing performance of the bearing can be improved. At the same time, the third sealing lip 86 is provided with a contact protrusion 86a only partially along the circumferential direction or is provided with a recess 86b on the surface opposite to the surface on which the contact protrusion 86a is formed to form a sealing lip. It is configured to reduce the thickness, making it possible to suppress excessive torque increase due to an increase in the contact sealing lip.

Meanwhile, according to one embodiment of the present invention, a side sealing portion 90 may be further provided on the outer surface of the frame 60, and the side sealing portion 90 may have a side protrusion 92 protruding outward. It can be provided. In this way, when the side protrusion 92 is formed on the side sealing portion 90 formed on the outer surface of the frame 60, foreign matter moving toward the center of the bearing flows to the outside of the bearing by the side protrusion 92. This makes it possible to more effectively prevent foreign substances from entering the bearing. In order to maximize the effect of preventing the inflow of foreign matter, the side protrusion 92 may be formed so that the radial outer surface has an inclined structure with respect to the direction of the rotation axis of the bearing (for example, to form a triangular structure as shown in FIG. 4). there is.

Although the present invention has been described above with reference to specific details such as specific components and limited examples, these examples are provided only to facilitate a more general understanding of the present invention, and the present invention is not limited thereto. Anyone with ordinary knowledge in the relevant technical field can make various modifications and variations from this description.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and all modifications equivalent or equivalent to the claims as well as the following claims fall within the scope of the spirit of the present invention. something to do.

10: rolling bearing
20: Inner ring
22: inner orbital surface
24: groove
30: paddle
32: Outer orbital surface
34: Coupling groove
40: rolling element
45: cage
50: Sealing member
60: frame
65: Elastic sealing part
70: First sealing part
80: Second sealing part
82: first sealing lip
82a: Non-contact protrusion
82b: inner surface (of first sealing lip)
84: Second sealing lip
86: Third sealing lip
86a: contact protrusion
86b: recess
90: Side sealing part
92: side protrusion

Claims (16)

An inner ring (20) on which the inner raceway of the rolling element is formed on the outer peripheral surface,
An outer ring (30) mounted on the radial outer side of the inner ring (20) and having an outer raceway surface of a rolling element formed on the inner circumferential surface,
A rolling element 40 seated and mounted between the inner ring 20 and the outer ring 30,
A cage 45 that accommodates and supports the rolling element 40,
It includes a sealing member (50) mounted on both ends of the rolling bearing (10) between the inner ring (20) and the outer ring (30),
The sealing member 50 is formed in a structure in which an elastic sealing part 65 is coupled to a frame 60,
The elastic sealing part 65 includes a first sealing part 70 formed at one end of the frame 60 and a second sealing part 80 formed at the other end,
The first sealing part 70 is inserted and mounted into the coupling groove 34 formed on the inner peripheral surface of the outer ring 30,
The second sealing part 80 includes a first sealing lip 82, a second sealing lip 84, and a third sealing lip 86 extending in different directions from the frame 60,
The first sealing lip 82 extends in a direction toward the inside of the rolling bearing 10 to perform non-contact sealing with the inner ring 20, and the second sealing lip 84 extends toward the inner ring 20. It is configured to extend in a direction to perform contact sealing with the inner ring 20, and the third sealing lip 86 extends in a direction toward the outside of the rolling bearing 10 to perform contact sealing with the inner ring 20. It is configured to perform,
The third sealing lip 86 is provided with a contact protrusion 86a at an end protruding toward the inner ring 20, and is configured to perform contact sealing with the inner ring 20 by the contact protrusion 86a,
The contact protrusions 86a of the third sealing lip 86 are formed in plural numbers spaced apart along the circumferential direction of the rotation axis,
On the surface of the third sealing lip 86 opposite to the surface on which the contact protrusion 86a is formed, a plurality of recesses 86b with a recessed structure are formed and spaced apart along the circumferential direction of the rotation axis,
The recess 86b is formed along the longitudinal direction from the end of the third sealing lip 86,
Rolling bearings. delete According to paragraph 1,
The recess 86b is formed only partially along the longitudinal direction from the end of the third sealing lip 86,
Rolling bearings. According to paragraph 3,
The minimum thickness (t1) of the third sealing lip 86 is formed from 0.1 mm to 0.3 mm,
Rolling bearings. delete delete According to paragraph 3,
The depression depth of the recess 86b is formed to be equal to the protrusion length of the contact protrusion 86a,
Rolling bearings. delete According to paragraph 1,
In the third sealing lip 86, the contact protrusion 86a and the recess 86b are formed at positions corresponding to each other,
Rolling bearings. delete According to paragraph 1,
The minimum thickness (t1) of the third sealing lip 86 is formed from 0.1 mm to 0.3 mm,
Rolling bearings. In paragraph 1
The depression depth of the recess 86b is formed to be equal to the protrusion length of the contact protrusion 86a,
Rolling bearings. In any one of paragraphs 1, 3, 4, 7, 9, 11 and 12
The first sealing lip 82 is provided with a non-contact protrusion 82a at its end protruding in the direction of the inner ring 20, and a labyrinth structure is formed between the first sealing lip 82 and the inner ring 20 by the non-contact protrusion 82a. configured to form,
Rolling bearings. According to clause 13,
The inner surface 82b of the first sealing lip 82 is formed as a concave curved surface,
Rolling bearings. According to clause 14,
The elastic sealing portion 65 further includes a side sealing portion 90 provided on the outer surface of the frame 60,
The side sealing portion 90 is provided with a side protrusion 92 protruding outward,
Rolling bearings. According to clause 15,
The radial outer surface of the side protrusion 92 is formed as an inclined surface,
Rolling bearings.

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