Pressure-resistant sealing structure of bearing

Abstract

The utility model discloses a pressure-resistant sealing structure of a bearing, which comprises a sealing ring arranged between a bearing inner ring and a bearing outer ring, a sealing ring outer lip is arranged on the radial outer side edge of the sealing ring, a metal framework is arranged in the sealing ring, and a U-shaped sealing groove is arranged on the end face of the bearing inner ring. A first supporting face is arranged at the bottom of the U-shaped sealing groove, a second supporting face is arranged at the position, close to the radial outer side of an opening of the U-shaped sealing groove, of the end face of the bearing inner ring, and an outer sealing face is obliquely arranged at the position, close to the radial inner side of the opening of the U-shaped sealing groove, of the end face of the bearing inner ring. An outer sealing lip attached to the outer sealing face is arranged on the radial inner side of the sealing ring, and a supporting lip extending into the U-shaped sealing groove is arranged on the inner side of the sealing ring. The utility model can solve the problem of deformation of the sealing lip of the inner ring of the existing bearing under external high pressure, thereby effectively prolonging the service life of the bearing.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a pressure-resistant sealing structure of a bearing. Background Art

[0002] At present, the inner ring of ordinary bearings generally adopts V-shaped or L-shaped sealing grooves, or no sealing grooves are set, and the sealing ring generally adopts a one-lip to three-lip structure. Since the sealing ring lip is made of rubber material, the supporting rigidity mainly depends on the metal frame of the sealing ring. When it is subjected to large external pressure (such as high-pressure water, high-pressure mixed liquid when the machine rotates, etc.), the metal frame of the sealing ring is insufficiently supported, and the sealing lip is prone to deformation and dents, which causes the seal to fail and shortens the service life of the bearing. Utility Model Content

[0003] The utility model provides a pressure-resistant sealing structure of a bearing, which can solve the deformation problem of the sealing lip of the existing bearing inner ring under external high pressure, thereby effectively prolonging the service life of the bearing.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressure-resistant sealing structure of a bearing, comprising a sealing ring arranged between a bearing inner ring and a bearing outer ring, a sealing ring outer lip being arranged on the radially outer edge of the sealing ring, a metal skeleton being arranged inside the sealing ring, a U-shaped sealing groove being arranged on the end face of the bearing inner ring, a first supporting surface being arranged at the bottom of the U-shaped sealing groove, a second supporting surface being arranged on the end face of the bearing inner ring near the radially outer side of the opening of the U-shaped sealing groove, an outer sealing surface being obliquely arranged on the end face of the bearing inner ring near the radially inner side of the opening of the U-shaped sealing groove, an outer sealing lip being arranged on the radially inner side of the sealing ring to fit with the outer sealing surface, a supporting lip extending into the U-shaped sealing groove being arranged on the inner side of the sealing ring, a clearance fit being formed between the end of the supporting lip and the first supporting surface, and a clearance fit being formed between the second supporting surface and the sealing ring.

[0005] Preferably, an inner sealing surface is arranged on the radial outer side of the inner ring of the bearing, and a grease sealing lip is arranged on the inner side of the sealing ring and located radially outside the inner sealing surface, and a clearance fit is formed between the inner sealing surface and the grease sealing lip.

[0006] Preferably, the gap between the grease sealing lip and the inner sealing surface is 0.1 mm to 0.2 mm.

[0007] Preferably, the width Y of the U-shaped sealing groove is 0.4-0.8 mm.

[0008] Preferably, the distance X between the second supporting surface and the sealing ring is 0.1-0.2 mm.

[0009] Preferably, the distance between the first supporting surface and the supporting lip is 0-0.15 mm.

[0010] Preferably, the angle α between the outer sealing surface and the end surface of the bearing inner ring is 20° to 50°.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The structure is simple and reliable. By designing a U-shaped sealing groove on the end face and two supporting surfaces, the inner lip of the bearing sealing ring has a support point under large external pressure. The greater the external pressure, the tighter the seal fits, avoiding deformation or dents, greatly improving the bearing sealing and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a partial cross-sectional structural diagram of the utility model. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0015] like Figure 1 As shown, the utility model provides a pressure-resistant sealing structure of a bearing, comprising a sealing ring 3 arranged between a bearing inner ring 2 and a bearing outer ring, a sealing ring outer lip 31 being arranged on the radial outer edge of the sealing ring 3, a metal skeleton 32 being arranged inside the sealing ring 3, a U-shaped sealing groove 1 being arranged on the end surface of the bearing inner ring 2, a first supporting surface 22 being arranged at the bottom of the U-shaped sealing groove 1, a second supporting surface 23 being arranged on the end surface of the bearing inner ring 2 near the radial outer side of the opening of the U-shaped sealing groove 1, an outer sealing surface 21 being obliquely arranged on the end surface of the bearing inner ring 2 near the radial inner side of the opening of the U-shaped sealing groove 1, an outer sealing lip 33 being fitted with the outer sealing surface 21 being arranged on the radial inner side of the sealing ring 3, a supporting lip 34 extending into the U-shaped sealing groove 1 being arranged on the inner side of the sealing ring 3, a clearance fit being formed between the end of the supporting lip 34 and the first supporting surface 22, and a clearance fit being formed between the second supporting surface 23 and the sealing ring 3.

[0016] Specifically, the metal skeleton 32 inside the sealing ring 3 can ensure the overall rigidity of the sealing ring 3, and the outer sealing lip 33 fits the outer sealing surface 21 to prevent external dust, mixed liquid, etc. from entering the bearing. When external pressure acts on the surface of the sealing ring 3, the metal skeleton 32 plays a major supporting role to ensure the stability of the main body, the supporting lip 34 does not contact the first supporting surface 22, and the second supporting surface 23 does not contact the sealing ring 3, and the supporting lip 34 will not be deformed or dented.

[0017] When the external pressure is too great, causing the support lip 34 to deform, the support lip 34 will abut against the first support surface 22, and at the same time the second support surface 23 will also contact the sealing ring 3 to play a supporting role. The support lip 34 in the U-shaped sealing groove 1 can ensure the overall stability of the inner lip of the sealing ring, and the greater the external pressure, the tighter the sealing lip fits and the better the sealing performance.

[0018] In order to improve the sealing effect and prevent grease leakage between the bearing inner ring and the bearing outer ring, an inner sealing surface 24 is provided on the radial outer side of the bearing inner ring 2, and a grease sealing lip 35 is provided on the inner side of the sealing ring 3 and is located radially outside the inner sealing surface 24. There is a clearance fit between the inner sealing surface 24 and the grease sealing lip 35. When the external pressure is too large, the grease sealing lip 35 will also deform and contact the inner sealing surface 24, which can prevent grease leakage between the bearing inner ring and the bearing outer ring, and cooperate with the support lip 34 to achieve a better sealing support effect.

[0019] In this embodiment, the gap between the grease sealing lip 35 and the inner sealing surface 24 is 0.1 mm to 0.2 mm, so that the grease sealing lip 35 can contact the inner sealing surface 24 after a certain deformation.

[0020] In this embodiment, the width Y of the U-shaped sealing groove 1 is 0.4-0.8 mm, the distance X between the second supporting surface 23 and the sealing ring 3 is 0.1-0.2 mm, and the distance between the first supporting surface 22 and the supporting lip 34 is 0-0.15 mm, so that the supporting lip 34 can play a sealing support role at the first time of external impact, and the angle α between the outer sealing surface 21 and the end face of the bearing inner ring 2 is 20°-50°.

[0021] In this embodiment, the total width of the second support surface 23 is 0.4-1 mm, and the distance between the second support surface 23 and the end surface of the bearing inner ring 2 is 0.6-1.0 mm, so that there is enough installation space for the sealing ring 3.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A pressure-resistant sealing structure for a bearing, comprising a sealing ring (3) arranged between a bearing inner ring (2) and a bearing outer ring, wherein a sealing ring outer lip (31) is arranged at a radially outer edge of the sealing ring (3), and a metal frame (32) is arranged inside the sealing ring (3), characterized in that: A U-shaped sealing groove (1) is arranged on the end surface of the bearing inner ring (2), a first supporting surface (22) is arranged at the bottom of the U-shaped sealing groove (1), a second supporting surface (23) is arranged on the end surface of the bearing inner ring (2) near the radial outer side of the opening of the U-shaped sealing groove (1), an outer sealing surface (21) is obliquely arranged on the end surface of the bearing inner ring (2) near the radial inner side of the opening of the U-shaped sealing groove (1), an outer sealing lip (33) is arranged on the radial inner side of the sealing ring (3) and is in contact with the outer sealing surface (21), a supporting lip (34) is arranged on the inner side of the sealing ring (3) and extends into the U-shaped sealing groove (1), a clearance fit is formed between the end of the supporting lip (34) and the first supporting surface (22), and a clearance fit is formed between the second supporting surface (23) and the sealing ring (3).

2. The pressure-resistant sealing structure of the bearing according to claim 1, characterized in that: An inner sealing surface (24) is arranged on the radial outer side of the bearing inner ring (2), and a grease sealing lip (35) is arranged on the inner side of the sealing ring (3) and is located radially outside the inner sealing surface (24). There is a clearance fit between the inner sealing surface (24) and the grease sealing lip (35).

3. The pressure-resistant sealing structure of the bearing according to claim 2, characterized in that: The gap between the grease sealing lip (35) and the inner sealing surface (24) is 0.1 mm to 0.2 mm.

4. The pressure-resistant sealing structure of the bearing according to claim 1, characterized in that: The width Y of the U-shaped sealing groove (1) is 0.4-0.8 mm.

5. The pressure-resistant sealing structure of the bearing according to claim 1, characterized in that: The distance X between the second supporting surface (23) and the sealing ring (3) is 0.1-0.2 mm.

6. The pressure-resistant sealing structure of a bearing according to claim 1, characterized in that: The distance between the first supporting surface (22) and the supporting lip (34) is 0 to 0.15 mm.

7. The pressure-resistant sealing structure of a bearing according to claim 1, characterized in that: The included angle α between the outer sealing surface (21) and the end surface of the bearing inner ring (2) is 20° to 50°.

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