Wide-temperature-range low-friction bearing sealing structure

Abstract

The invention discloses a wide-temperature-range low-friction contact type bearing sealing structure which comprises an outer sealing groove, an inner sealing step, a sealing ring and a wide-temperature compensation ring. Wherein the wide-temperature compensation ring is made of a polytetrafluoroethylene material and is in large interference fit with the inner sealing step; and the sealing ring is in small interference fit with the wide-temperature compensation ring. By means of the design, double interference fit is achieved, and the friction torque is reduced to the maximum extent while the sealing effect is guaranteed. The special structural design (the inner ring surface is provided with a slope, and one side of the outer ring surface is in a higher arc shape) of the wide-temperature compensation ring ensures that the stable sealing effect can be maintained under various temperature conditions. The adaptability of the bearing seal in a wide temperature range environment is remarkably improved, meanwhile, the friction torque is effectively reduced, and the bearing seal has a good application prospect.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, and in particular to a contact-type bearing sealing structure with wide temperature range and low friction. Background Art

[0002] Bearing seal is one of the key factors to ensure the normal operation of bearings. Although the existing contact seal structure has a good sealing effect, it has serious problems in a wide temperature range environment. Due to the large difference in the linear expansion coefficient between the sealing ring material (such as rubber or polytetrafluoroethylene) and the bearing steel, the interference between the sealing ring and the bearing changes significantly at different temperatures. This change can cause problems such as seal failure at high temperatures and excessive friction torque at low temperatures. In addition, traditional steel-rubber or steel-polytetrafluoroethylene friction pairs will also generate a large friction torque. Therefore, how to design a bearing sealing structure that can maintain a stable sealing effect in a wide temperature range and has low friction characteristics has become a technical problem to be solved in this field. Summary of the invention

[0003] The purpose of the present invention is to provide a contact bearing sealing structure with low friction in a wide temperature range, which solves the problems of unstable interference and large friction torque of the sealing structure in the prior art under a wide temperature range.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a wide temperature range low-friction bearing sealing structure, comprising a bearing outer ring, the edge of whose inner surface is provided with an outer sealing groove; a bearing inner ring, the edge of whose outer surface is provided with an inner sealing step; a sealing ring, the outer surface of which is fixed in the outer sealing groove; a wide temperature compensation ring, which is an annular structure and is located in the inner sealing step; wherein the inner ring surface of the wide temperature compensation ring is interference fit with the inner sealing step, and the outer ring surface of the wide temperature compensation ring is in contact with the inner surface of the sealing ring.

[0005] Preferably, the outer ring surface of the wide temperature compensation ring is interference fit with the sealing ring, and the interference between the two is smaller than the interference between the wide temperature compensation ring and the inner sealing step.

[0006] Preferably, the inner ring surface of the wide temperature compensation ring is a cylindrical inner surface, and the outer ring surface is an arc-shaped outer surface.

[0007] Preferably, the cross section of the outer ring surface of the wide temperature compensation ring is an arc with one side being higher, and when installed, the higher side faces the inner side of the bearing.

[0008] Preferably, the outer surface of the sealing ring is interference fit with the outer sealing groove.

[0009] Preferably, it further comprises a metal spring ring for axially compressing the sealing ring, and the sealing ring is compressed and fixed in the outer sealing groove by the metal spring ring on the axial outside thereof.

[0010] Preferably, the diameter of the bottom of the inner sealing step is smaller than the outer diameter of the bearing inner ring.

[0011] Preferably, a mounting slope is provided on a side of the inner ring surface of the wide temperature compensation ring close to the bearing center.

[0012] Preferably, the wide temperature compensation ring and the sealing ring are made of materials with similar thermal expansion.

[0013] Preferably, the sealing ring is made of rubber material or polytetrafluoroethylene material attached to a steel frame, and the wide temperature compensation ring is made of polytetrafluoroethylene material.

[0014] According to the above technical solution, the beneficial effects of the utility model are: A wide temperature range low friction bearing sealing structure of the present invention has the following beneficial effects: First, the wide temperature compensation ring includes a cylindrical inner surface and an arc-shaped outer surface. The inner surface has an interference fit with the inner sealing step, and the outer surface has an interference fit with the sealing ring. This structural design has multiple advantages. The inner surface of the wide temperature compensation ring is cylindrical, and the large interference fit with the inner sealing step ensures a stable installation and prevents loosening under various working conditions. The arc-shaped design of the outer surface provides a small interference fit with the sealing ring, which not only ensures a good sealing effect, but also minimizes the friction torque. This double interference fit design cleverly balances the sealing performance and low friction requirements. At the same time, since the wide temperature compensation ring is made of polytetrafluoroethylene, its thermal expansion characteristics are similar to those of the sealing ring, which effectively solves the stability problem of the sealing structure in a wide temperature range environment, improves the adaptability and reliability of the bearing seal in a wide temperature range environment, and maintains low friction characteristics.

[0015] Secondly, the higher side of the arc-shaped outer surface section of the wide temperature compensation ring is set toward the inner side of the bearing. This asymmetric design makes the wide temperature compensation ring difficult to loosen under various working conditions, enhances the stability and reliability of the sealing structure, and is also conducive to the reflux of lubricating oil, further improving the sealing performance and service life of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the longitudinal section (rubber sealing ring) structure of the present invention; Figure 2 yes Figure 1 Enlarged view of area A Figure 3 It is a schematic diagram of the structure of the longitudinal section (polytetrafluoroethylene sealing ring) of the present invention; Figure 4 yes Figure 3 Enlarged view of area B Figure 5This is a schematic diagram of the longitudinal cross-section structure of the wide temperature compensation ring of the present invention; Figure 6 yes Figure 5 Enlarged view of area C Figure 7 It is a schematic diagram of the longitudinal cross-section structure of the outer ring of the bearing of the present invention; Figure 8 It is a schematic diagram of the longitudinal cross-section structure of the inner ring of the bearing of the present invention; Markings in the figure: 1. Bearing outer ring, 2. Bearing inner ring, 3. Sealing ring (rubber sealing ring with metal skeleton or polytetrafluoroethylene sheet sealing ring), 4. Metal spring ring, 5. Wide temperature compensation ring, 101. External sealing groove, 201. Internal sealing step, 501. Inner ring surface, 502. Assembly slope, 503. External ring surface. DETAILED DESCRIPTION

[0017] Below, the present invention is described in detail by means of exemplary embodiments; however, it should be understood that the elements, structures and features in one embodiment may also be beneficially combined in other embodiments without further description; It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this document shall have the usual meanings understood by persons with ordinary skills in the field to which the invention belongs; the words "one", "an" or "the" and the like used in the patent application specification and claims of the present invention do not express quantity restrictions, but indicate the existence of at least one; the words "first", "second" and "third" used in this document shall not be regarded as restrictions on the order of components, but are only used to distinguish different components; the words "include" or "comprise" and the like indicate that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, but do not exclude other elements or objects with the same function; The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0018] like Figure 1 , 2 , 3, 4, 5, 6, 7 and 8, Figure 1 It is a schematic diagram of the longitudinal section (rubber sealing ring) structure of the present invention; Figure 2 yes Figure 1 A magnified image of area A; Figure 3 It is a schematic diagram of the structure of the longitudinal section (polytetrafluoroethylene sealing ring) of the present invention; Figure 4 yes Figure 3 Enlarged view of area B; Figure 5 This is a schematic diagram of the longitudinal cross-section structure of the wide temperature compensation ring of the present invention; Figure 6 yes Figure 5 Enlarged view of the middle C area; Figure 7It is a schematic diagram of the longitudinal cross-section structure of the outer ring of the bearing of the present invention; Figure 8 It is a schematic diagram of the longitudinal cross-section structure of the inner ring of the bearing of the present invention.

[0019] like Figure 1 and Figure 2 The figure shows an embodiment of the present invention, a wide temperature range low friction bearing sealing structure, comprising an outer sealing groove 101, an inner sealing step 201, a sealing ring 3 and a wide temperature compensation ring 5; the sealing ring 3 is made of rubber material attached to a steel frame, and the wide temperature compensation ring 5 is made of polytetrafluoroethylene; the inner surface edge of the bearing outer ring 1 is provided with an outer sealing groove 101 for fixing the sealing ring 3. The outer surface edge of the bearing inner ring 2 is provided with an inner sealing step 201 for installing the wide temperature compensation ring 5. The wide temperature compensation ring 5 is an annular structure, located in the inner sealing step 201, its inner ring surface 501 is interference fit with the inner sealing step 201, and its outer ring surface 503 is in contact with the inner surface of the sealing ring 3.

[0020] In addition, the sealing ring 3 is made of rubber material attached to a steel frame. The rubber material provides good sealing performance, while the steel frame enhances the overall strength and dimensional stability of the sealing ring. The outer sealing groove 101 is arranged on the inner surface edge of the bearing outer ring 1, which is used to fix the rubber sealing ring 3 and assist in sealing the outer surface of the sealing ring 3. The inner sealing step 201 is arranged on the outer surface of the bearing inner ring 2, and the bottom diameter of the inner sealing step 201 is slightly smaller than the outer diameter of the bearing inner ring. This design helps to improve the installation stability of the wide temperature compensation ring 5.

[0021] The design of the wide temperature compensation ring 5 is one of the core innovations of the present invention. Figure 5 and Figure 6 As shown, the wide temperature compensation ring 5 is annular, and its inner ring surface 501 is a cylindrical inner surface. A mounting slope 502 is provided on the side of the inner ring surface 501 close to the center of the bearing. This design is conducive to the installation of the wide temperature compensation ring 5, while increasing its contact area with the inner sealing step 201 and improving the stability of the fit. The cross-section of the outer ring surface 503 of the wide temperature compensation ring 5 is an arc with one side higher, and the higher side faces the inner side of the bearing during installation. This design is not only conducive to improving the sealing effect, but also prevents the wide temperature compensation ring 5 from loosening under various working conditions.

[0022] A large interference fit is used between the wide temperature compensation ring 5 and the inner sealing step 201, while a small interference fit is used between the inner surface of the sealing ring 3 and the outer ring surface 503 of the wide temperature compensation ring 5. This double interference fit design is another innovation of the present invention, which minimizes the friction torque while ensuring the sealing effect. Specifically, the interference between the inner ring surface 501 of the wide temperature compensation ring 5 and the inner sealing step 201 is greater than the interference between the outer ring surface 503 of the wide temperature compensation ring 5 and the sealing ring 3. This design ensures that the wide temperature compensation ring 5 can maintain a stable installation state under various temperature conditions, while not causing excessive pressure on the sealing ring 3, thereby reducing the friction torque.

[0023] In addition, the present invention optimizes the friction pair of the contact seal from the traditional steel-rubber (or steel-PTFE) to PTFE-rubber (or PTFE-PTFE), which significantly reduces the friction coefficient and helps to further reduce the friction torque. This design not only improves the operating efficiency of the bearing, but also helps to extend the service life of the bearing.

[0024] In another embodiment, Figure 3 and Figure 4 As shown, the sealing ring 3 is made of a thin sheet of polytetrafluoroethylene. In this case, the fixing method between the outer surface of the sealing ring 3 and the outer sealing groove 101 is changed from interference fit to axial compression using a metal spring ring 4. Specifically, the metal spring ring 4 is located on the axial outer side of the sealing ring 3, and the sealing ring 3 is fixed in the outer sealing groove 101 by the compression force. This design uses a thinner polytetrafluoroethylene sealing ring, and the polytetrafluoroethylene sheet has an extremely low friction coefficient and excellent temperature resistance, and can maintain a stable sealing effect in a wider temperature range.

[0025] The use of the metal spring ring 4 is to solve the problem that the polytetrafluoroethylene sheet is difficult to fix by interference fit. The metal spring ring 4 can apply uniform pressure to the polytetrafluoroethylene sheet in the axial direction to ensure that the sealing ring 3 is always in close contact with the outer sealing groove 101. Another advantage of this fixing method is that it is easy to disassemble and replace the sealing ring, which improves the maintainability of the bearing.

[0026] Both embodiments of the present invention fully reflect the design concept of a low-friction bearing seal structure with a wide temperature range. Through clever structural design and material selection, the adaptability problem of traditional contact seals in a wide temperature range environment is solved, while the friction torque is significantly reduced. The present invention has a clever design, a simple and compact structure, is convenient and practical, greatly enhances the adaptability of contact seals to a wide temperature range environment, and effectively reduces the friction of the contact seal structure. It provides a new idea and method for solving the reliability problem of bearing seals in extreme environments.

[0027] In practical applications, the appropriate implementation can be selected according to the specific working environment and performance requirements. For example, for situations where the working temperature changes greatly but the friction torque requirements are not particularly strict, the first implementation can be selected; while for situations where the friction torque requirements are extremely strict, the second implementation can be selected.

[0028] The preferred specific implementation modes and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes and embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the concept of the present invention.

Claims

1. A low-friction bearing sealing structure with a wide temperature range, characterized in that: include: The bearing outer ring (1) has an outer sealing groove (101) on the edge of the inner surface thereof; The bearing inner ring (2) has an inner sealing step (201) on the edge of its outer surface; A sealing ring (3), the outer surface of which is fixed in the outer sealing groove (101); A wide temperature compensation ring (5) having an annular structure and located in the inner sealing step (201); The inner ring surface (501) of the wide temperature compensation ring (5) is interference-fitted with the inner sealing step (201), and the outer ring surface (503) of the wide temperature compensation ring (5) is in contact with the inner surface of the sealing ring (3).

2. A wide temperature range low friction bearing sealing structure according to claim 1, characterized in that: The outer ring surface (503) of the wide temperature compensation ring (5) and the sealing ring (3) are interference fit, and the interference amount of the two is smaller than the interference amount of the wide temperature compensation ring (5) and the inner sealing step (201).

3. A wide temperature range low friction bearing sealing structure according to claim 1, characterized in that: The inner ring surface (501) of the wide temperature compensation ring (5) is a cylindrical inner surface, and the outer ring surface (503) is an arc-shaped outer surface.

4. A wide temperature range low friction bearing sealing structure according to claim 1, characterized in that: The cross section of the outer ring surface (503) of the wide temperature compensation ring (5) is an arc with one side being higher, and when installed, the higher side faces the inner side of the bearing.

5. The wide temperature range low friction bearing sealing structure according to claim 1, characterized in that: The outer surface of the sealing ring (3) is interference fit with the outer sealing groove (101).

6. A wide temperature range low friction bearing sealing structure according to claim 1, characterized in that: It also includes a metal spring ring (4) for axially pressing the sealing ring (3); the sealing ring (3) is pressed and fixed in the outer sealing groove (101) by the metal spring ring (4) on the axial outside thereof.

7. A wide temperature range low friction bearing sealing structure according to claim 1, characterized in that: The diameter of the bottom of the inner sealing step (201) is smaller than the outer diameter of the bearing inner ring (2).

8. The wide temperature range low friction bearing sealing structure according to claim 1, characterized in that: A mounting slope (502) is provided on a side of the inner ring surface (501) of the wide temperature compensation ring (5) close to the center of the bearing.

9. The wide temperature range low friction bearing sealing structure according to claim 1, characterized in that: The wide temperature compensation ring (5) and the sealing ring (3) are made of materials with similar thermal expansion.

10. A wide temperature range low friction bearing sealing structure according to claim 9, characterized in that: The sealing ring (3) is made of a rubber material or a polytetrafluoroethylene material attached to a steel frame, and the wide temperature compensation ring (5) is made of a polytetrafluoroethylene material.

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