Sealing ring for extra-miniature bearing and extra-miniature bearing

Abstract

The utility model provides a seal ring for super-miniature bearing and super-miniature bearing wherein the seal ring for super-miniature bearing comprises a seal body and a skeleton, the excircle side of the seal body is provided with an outer seal lip, the inner circle side of the seal body is provided with an inner seal lip, and the skeleton is a sheet-shaped circular ring structure with a rectangular cross section. A framework groove for containing the framework is formed in the sealing body, the outer circle side of the sealing body extends inwards in the radial direction to form a blocking edge blocking the inner side of the outer circle side of the framework, and the inner circle side of the sealing body extends inwards in the axial direction to form a supporting edge supporting the inner circle side of the framework. The ultra-miniature bearing comprises a bearing outer ring, a bearing inner ring, a rolling body and a retainer, and the sealing ring is mounted between the bearing outer ring and the bearing inner ring and is the sealing ring. The sealing ring has the advantages that the framework is of the sheet-shaped circular ring structure with the rectangular section, the space size is small, the structure is simple, the strength is high, the sealing ring is not prone to deformation, the sealing effect is good, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a sealing ring for a micro bearing and a micro bearing. Background Art

[0002] Existing bearing seals are composed of a frame and rubber, installed in a sealed dustproof groove between the bearing outer ring and the ends of the bearing outer ring. The frame has a "7" cross-section, which takes up a lot of space and cannot be installed in ultra-miniature bearings. Therefore, seals installed in ultra-miniature bearings need to be relatively thin, resulting in low seal strength and easy deformation. This can cause bearing grease leakage and allow dust and debris to enter the bearing, causing premature failure and shortening the bearing life. Summary of the Invention

[0003] The purpose of the utility model is to provide a sealing ring for a micro bearing and a micro bearing, which can solve the technical problems mentioned in the background technology.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is as follows: A sealing ring for a special micro bearing, comprising a sealing body and a skeleton, the outer circle side of the sealing body is provided with an outer sealing lip that seals with the outer ring of the bearing, the inner circle side of the sealing body is provided with an inner sealing lip that seals with the inner ring of the bearing, the skeleton is a thin sheet-like circular ring structure with a rectangular cross-section, a skeleton groove for accommodating the skeleton is provided in the sealing body, the outer circle side of the sealing body extends radially inwardly with a rib that blocks the inner side of the outer circle side of the skeleton, and the inner circle side of the sealing body extends axially inwardly with a support edge that supports the inner circle side of the skeleton.

[0005] Preferably, the thickness of the supporting edge is 0.08-0.20 mm.

[0006] Preferably, the end surface of the supporting edge is flush with the inner end surface of the frame.

[0007] Preferably, the outer sealing lip is placed in a receiving groove on the bearing outer ring and is interference fit with the receiving groove. An elastic groove opening outward is provided on the outer sealing lip.

[0008] Preferably, the inner sealing lip includes a connecting portion extending axially inwardly from the inner circular side of the sealing body, and a contact lip provided at the end of the connecting portion, and the contact lip forms an axial contact seal with the side of the step of the bearing inner ring.

[0009] Preferably, the inner sealing lip is formed by axially extending inward from the inner circular side of the sealing body, and the end of the inner sealing lip extends into the step of the bearing inner ring but does not contact the side and bottom surfaces of the step.

[0010] The utility model also provides a special miniature bearing, including a bearing outer ring, a bearing inner ring, a rolling element and a retaining frame installed between the bearing outer ring and the bearing inner ring, and a sealing ring located on both sides of the rolling element and the retaining frame installed between the bearing outer ring and the bearing inner ring, and the sealing ring is the sealing ring described above.

[0011] Compared with the prior art, the beneficial effect of the present invention is that: by adopting the above structure, the skeleton is a thin-sheet circular ring structure with a rectangular cross-section, which has a small space volume, a simple structure, and high strength, making the sealing ring not easy to deform, having a good sealing effect and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of the sealing ring of the present utility model.

[0013] Figure 2 This is a structural diagram of the bearing of the present utility model.

[0014] Figure 3 This is another structural schematic diagram of the sealing ring of the present invention.

[0015] Figure 4 This is another structural schematic diagram of the bearing of the present invention. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0017] like Figure 1 and Figure 3 As shown, the present invention provides a sealing ring for a micro bearing, comprising a sealing body 1 and a frame 2. The outer circumference of the sealing body 1 is provided with an outer sealing lip 4 that seals with the bearing outer ring 3, and the inner circumference of the sealing body 1 is provided with an inner sealing lip 6 that seals with the bearing inner ring 5. The frame 2 is a thin, rectangular, circular ring structure. The sealing body 1 is provided with a frame groove for accommodating the frame 2. The outer circumference of the sealing body 1 has a radially inwardly extending rib 7 that blocks the inner side of the outer circumference of the frame 2, and the inner circumference of the sealing body 1 has an axially inwardly extending support rib 8 that supports the inner circumference of the frame 2. The frame 2 of the present invention is a thin, rectangular, circular ring structure with a small volume and high strength, making the sealing ring less prone to deformation, providing good sealing effect and a long service life. The frame 2 is placed in the frame groove and is limited in position by the rib 7 and support rib 8, resulting in a simple and reliable structure.

[0018] Preferably, the thickness of the support edge 8 is 0.08-0.20 mm, and the thickness of the support edge 8 is preferably 0.10 mm. The end face of the support edge 8 is flush with the inner end face of the skeleton 2, so that the skeleton 2 can be well wrapped in the sealing body 1, and the structure is simple.

[0019] Preferably, the outer sealing lip 4 is placed in the receiving groove 9 on the bearing outer ring 3 and the outer sealing lip 4 is interference fit with the receiving groove 9. The outer sealing lip 4 is provided with an elastic groove 10 opening outward. When the outer sealing lip 4 is installed in the receiving groove 9 of the bearing outer ring 3, the outer sealing lip 4 will deform toward the elastic groove 10, thereby making it easy for the outer sealing lip 4 to be installed in the receiving groove 9.

[0020] As a preference, Figure 1 As shown, the inner sealing lip 6 includes a connecting portion 11 extending axially inwardly from the inner circular side of the sealing body 1, and a contact lip 12 provided at the end of the connecting portion 11. The contact lip 12 and the side of the step 15 of the bearing inner ring 5 form an axial contact seal, thus forming a contact sealing structure with the characteristics of dustproof and grease leakage prevention, and can be used in high-speed and harsh environmental conditions.

[0021] As a preference, Figure 2 As shown, the inner sealing lip 6 is formed by the inner circular side of the sealing body 1 extending axially inward, and the end of the inner sealing lip 6 extends into the step 15 of the bearing inner ring 5 but does not contact the side and bottom surfaces of the step 15, thus forming a non-contact sealing structure that can be used in high-speed and clean working conditions.

[0022] like Figure 2 、 Figure 4 As shown, the present invention also provides a micro-miniature bearing comprising an outer ring 3, an inner ring 5, rolling elements 13 and a retaining cage 14 mounted between the outer ring 3 and the inner ring 5. Seal rings are mounted between the outer ring 3 and the inner ring 5, located on both sides of the rolling elements 13 and the retaining cage 14. These seal rings are the seal rings described above. The seal rings have a small volume, a simple structure, and are not easily deformed. They can be used in micro-miniature bearings, resulting in excellent sealing performance and a long service life.

[0023] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and the embodiments. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A sealing ring for a micro bearing, comprising a sealing body and a frame, wherein the outer circumference of the sealing body is provided with an outer sealing lip that seals with the outer ring of the bearing, and the inner circumference of the sealing body is provided with an inner sealing lip that seals with the inner ring of the bearing, characterized in that: The skeleton is a thin sheet-like circular ring structure with a rectangular cross-section. A skeleton groove for accommodating the skeleton is provided in the sealing body. The outer circle side of the sealing body extends radially inward to form a retaining edge that blocks the inner side of the outer circle side of the skeleton. The inner circle side of the sealing body extends axially inward to form a supporting edge that supports the inner circle side of the skeleton.

2. The sealing ring for ultra-miniature bearing according to claim 1, characterized in that: The thickness of the supporting edge is 0.08-0.20 mm.

3. The sealing ring for ultra-miniature bearing according to claim 2, characterized in that: The end surface of the supporting edge is flush with the inner end surface of the frame.

4. The sealing ring for ultra-miniature bearing according to claim 1, characterized in that: The outer sealing lip is placed in the receiving groove on the bearing outer ring and has an interference fit with the receiving groove. The outer sealing lip is provided with an elastic groove opening outward.

5. The sealing ring for a micro bearing according to any one of claims 1 to 4, characterized in that: The inner sealing lip includes a connecting portion extending axially inwardly from the inner circular side of the sealing body, and a contact lip provided at the end of the connecting portion. The contact lip forms an axial contact seal with the side surface of the step of the bearing inner ring.

6. The sealing ring for a micro bearing according to any one of claims 1 to 4, characterized in that: The inner sealing lip is formed by axially extending inward from the inner circular side of the sealing body, and the end of the inner sealing lip extends into the step of the bearing inner ring but does not contact the side surface and bottom surface of the step.

7. A micro bearing comprising an outer ring, an inner ring, rolling elements and a retaining frame mounted between the outer ring and the inner ring, characterized in that: A sealing ring is installed between the bearing outer ring and the bearing inner ring and is located on both sides of the rolling element and the retaining frame. The sealing ring is the sealing ring according to any one of claims 1 to 6.

Images