CN111765172A - Sealing device of high-speed outer ring rotary ball bearing - Google Patents
Sealing device of high-speed outer ring rotary ball bearing Download PDFInfo
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- CN111765172A CN111765172A CN202010736698.9A CN202010736698A CN111765172A CN 111765172 A CN111765172 A CN 111765172A CN 202010736698 A CN202010736698 A CN 202010736698A CN 111765172 A CN111765172 A CN 111765172A
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- ring
- sealing
- sealing ring
- lip
- radial
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
- F16C33/7806—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for spherical roller bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
- F16C33/585—Details of specific parts of races of raceways, e.g. ribs to guide the rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
Abstract
The invention belongs to the technical field of bearings, and relates to a sealing device of a high-speed outer ring rotary ball bearing.A sealing ring body is arranged between an outer ring and an inner ring of the bearing, the radial outer side of the sealing ring body is in interference fit with an outer ring V-shaped groove arranged on the outer ring, and the sealing ring body comprises a rigid framework and sealing rubber vulcanized on the rigid framework; the radial outer end of the sealing ring body is constructed into a sealing ring head, the radial inner end of the sealing ring body is constructed into a sealing ring lip, the sealing ring lip comprises a grease leakage prevention lip, a main lip and an inlet lip, and the grease leakage prevention lip is arranged at the axial inner end of the radial inner side of the sealing ring body. The optimal design of the matching part of the sealing ring and the outer ring and the matching part of the inner ring realizes that the contact force and the contact pressure between the sealing ring and the inner ring are basically kept unchanged along with the increase of the rotating speed when the sealing ring rotates at high speed along with the outer ring, and solves the problems of rubber tearing, rapid abrasion, sealing failure and the like caused by the high-speed rotation of the sealing ring.
Description
Technical Field
The invention belongs to the technical field of bearings, and relates to a sealing device of a high-speed outer ring rotary ball bearing.
Background
In a bearing, one or more seals are used in the bearing to prevent leakage of grease inside the bearing and ingress of external contaminants into the interior of the bearing. Typically such a seal ring is fixed to the outer race of the bearing and cooperates with the inner race to form a dynamic seal. According to the matching form of the sealing ring and the inner ring, the sealing ring can be divided into a contact type and a non-contact type, and the contact type sealing performance is far higher than the non-contact type sealing performance.
In order to improve efficiency in modern industries, transportation industries, and the like, particularly in the automobile industry, the development is directed toward higher speed, lighter weight, higher efficiency, and the like. New requirements are put on the automobile engine and the accessory mechanism thereof, in particular to a bearing for a tension pulley and an idler pulley in the accessory mechanism. The rotating speed of the outer ring needs to reach 20000r/min, the dm multiplied by n value is about 60 ten thousand, and good dustproof and waterproof effects are achieved without adding extra protective devices around the outer ring. Since the bearing is characterized in that the outer ring rotates at a high speed, the sealing element rotates at a high speed together with the outer ring. Because the bearing is required to have good sealing performance, the sealing ring and the inner ring need to be matched in a contact mode. In the existing sealing ring design, the contact force between the sealing ring and the inner ring is sharply increased or reduced along with the increase of the rotating speed due to the high-speed rotation of the sealing ring, so that the problems of rubber tearing, sharp abrasion, sealing failure and the like of a sealing element are caused, and further the bearing failure is caused.
Patent CN 108391275 a provides a high-speed deep groove ball bearing, which is mainly characterized in that the design of a channel of the bearing, such as the ratio of the radius of the arc of the channel to the diameter of a steel ball, solves the problem that the internal design of the existing bearing can not meet the requirement of high speed. There is no corresponding description of the design of the sealing ring, particularly when the sealing ring is rotating.
Patent ZL 200720073652.3 provides a sealing structure of a high-speed ball bearing, which is characterized in that an inner palace type ring, a flange and an outer palace type ring are adopted to form a clearance type labyrinth seal. The sealing structure uses 3 sealing rings, not only increases the width of the bearing in the axial direction, but also increases the difficulty of assembly and increases the processing cost.
At present, a sealing element rotates at a high speed along with an outer ring, and a sealing structure in contact fit is needed between a sealing ring and the inner ring. In the existing sealing ring design, the contact force between the sealing ring and the inner ring is sharply increased or reduced along with the increase of the rotating speed due to the high-speed rotation of the sealing ring, so that the problems of rubber tearing, sharp abrasion, sealing failure and the like of a sealing element are caused, and further the bearing failure is caused.
Disclosure of Invention
The invention aims at the problems and provides a sealing device of a high-speed outer ring rotary ball bearing, the optimal design of the matching part of a sealing ring and an outer ring and the matching part of the sealing ring and an inner ring realizes that the contact force and the contact pressure between the sealing ring and the inner ring are basically kept unchanged along with the increase of the rotating speed when the sealing ring rotates at high speed along with the outer ring, and solves the problems of rubber tearing, rapid abrasion, sealing failure and the like caused by the high-speed rotation of the sealing ring.
According to the technical scheme of the invention: the utility model provides a high-speed outer lane swivel ball bearing's sealing device, the sealing washer body sets up between the outer lane of bearing and inner circle, the outer lane V type groove interference fit that sets up on the radial outside of sealing washer body and the outer lane, its characterized in that: the sealing ring body comprises a rigid framework and rubber vulcanized on the rigid framework;
the radial outer end of the sealing ring body is a sealing ring head, the radial inner end of the sealing ring body is a sealing ring lip, the sealing ring lip comprises a grease leakage prevention lip, a main lip and an inlet lip, the grease leakage prevention lip is arranged at the axial inner end of the radial inner side of the sealing ring body, the radial inner side of the sealing rubber is integrally connected with a sealing ring waist, and the main lip and the inlet lip are integrally connected with the radial inner end of the sealing ring waist;
the main lip is abutted against the surface of a groove body of an inner ring V-shaped groove arranged on the inner ring, a gap is formed between the grease leakage prevention lip and the radial outer surface of the inner ring, and a gap is formed between the inlet lip and the outer groove surface of the inner ring V-shaped groove.
As a further improvement of the invention, the radial angle between the waist part of the sealing ring and the rigid framework is 8-15 degrees, and the thickness L of the waist part of the sealing ring is 0.3-0.5 mm.
As a further improvement of the invention, the outer diameter side of the rigid framework is obliquely provided with an upper axial part corresponding to the head part of the sealing ring, the upper axial part is integrally connected with an upper radial part, and the radial outer end of the upper radial part is provided with a ridge-shaped extension part so as to realize the fastening of sealing rubber at the corresponding part; the other side of rigidity skeleton sets up the collateral branch fagging of slope form, and the sealing washer waist extends in the outer end of collateral branch fagging.
As a further improvement of the invention, the sealing rubber is provided with an elastic groove corresponding to the axial outer end of the sealing ring head.
As a further improvement of the invention, the interference magnitude delta A of the matching of the head of the sealing ring and the outer ring V-shaped groove is more than or equal to 0.1 mm.
As a further improvement of the invention, the distance L1 between the rigid framework and the inlet of the outer ring V-shaped groove is more than or equal to 0.3 mm.
As a further improvement of the invention, the interference magnitude delta M of the main lip and the V-shaped groove of the inner ring is = 0.2-0.25 mm.
As a further improvement of the invention, the head fillet of the main lip is more than or equal to 0.1mm and more than or equal to R and more than or equal to 0.03 mm.
As a further improvement of the invention, the difference between the area of the cross section at two sides and the inertia moment of the main lip side area B and the inlet lip side area A of the sealing ring head is less than or equal to 10%.
The invention has the technical effects that: according to the invention, through the optimized design of the matching part of the sealing ring and the outer ring and the matching part of the sealing ring and the inner ring, the contact force between the sealing ring and the inner ring is basically kept unchanged along with the increase of the rotating speed when the sealing ring rotates at high speed along with the outer ring, and the problems of rubber tearing, rapid abrasion, sealing failure and the like caused by the high-speed rotation of the sealing ring are solved.
Drawings
Fig. 1 is a schematic sectional view of a sealing device of a high-speed outer ring rolling ball bearing of the present invention.
Fig. 2 is a schematic sectional view of a seal head of the high-speed outer ring rolling ball bearing of the present invention.
Fig. 3 is a schematic cross-sectional view of a lip portion of a sealing device of a high-speed outer ring rolling ball bearing of the present invention.
Fig. 4 is a simulation calculation result of the contact force between the sealing device of the high-speed outer ring rotary ball bearing and the inner ring of the present invention.
Fig. 5 is a simulation calculation result of the contact pressure between the sealing device of the high-speed outer ring rolling ball bearing of the present invention and the inner ring.
Description of reference numerals: 1: an outer ring, 2: an outer ring V-shaped groove, 3: a sealing ring head, 4: a rigid framework, 4-1: rigid backbone upper axial portion, 4-2: rigid backbone upper radial portion, 4-3: the extension part 5 of the ridge-shaped rigid framework comprises sealing rubber 6 on the inner diameter side of the framework, 7 on the lip part of a sealing ring, 8 on the waist part of the sealing ring, 9 on the inlet lip, 10 on the V-shaped groove of the inner ring, 11 on the inner ring, 12 on the main lip, 13 on the grease leakage prevention lip, 14 on the outer diameter side of the framework, 15 on the elastic groove, A on the inlet lip side region and B on the main lip side region.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In fig. 1, the structures of the rolling elements, the cage, and the like in the bearing are omitted, and the seal ring of the present invention, the structures related thereto, and the features thereof will be described only with respect to the specific features of the seal ring and the portions engaged with the inner and outer rings.
As shown in fig. 1 to 3, the invention relates to a sealing device of a high-speed outer ring rotary ball bearing, wherein a sealing ring body is arranged between an outer ring 1 and an inner ring 11 of the bearing, the radial outer side of the sealing ring body is in interference fit with an outer ring V-shaped groove 2 arranged on the outer ring 1, and the sealing ring body comprises a rigid framework 4 and sealing rubber 5 vulcanized on the rigid framework 4.
The radial outer end of the sealing ring body is constructed into a sealing ring head 3, the interference magnitude delta A of the sealing ring head 3 matched with the outer ring V-shaped groove 2 is larger than or equal to 0.1mm, and therefore when the outer ring drives the sealing ring to rotate at a high speed, failure such as sealing ring creeping and falling cannot occur.
As shown in fig. 3, the radially inner end of the seal ring body is configured as a seal ring lip portion 7, the seal ring lip portion 7 includes a grease leakage prevention lip 13, a main lip 12, and an inlet lip 9, wherein the grease leakage prevention lip 13 is provided at the axially inner end of the radially inner side of the seal ring body, the radially inner side of the seal rubber 5 is integrally connected to the seal ring waist portion 8, and the main lip 12 and the inlet lip 9 are integrally connected to the radially inner end of the seal ring waist portion 8.
The inlet lip 9 mainly functions to prevent most foreign matters from entering the contact area between the main lip 12 and the inner ring V-shaped groove 10, and further functions to balance the influence of the centrifugal force generated by the main lip side area B of the cross section of the sealing ring on the interference between the sealing lip 12 and the inner ring V-shaped groove 10 due to high-speed rotation of the sealing ring. The main characteristic is that the difference between the area of the main lip side area B and the inlet lip side area A of the cross section of the sealing ring and the inertia moment is less than or equal to 10%.
The main lip 12 abuts against the groove body surface of the inner ring V-shaped groove 10 arranged on the inner ring 11, a gap is formed between the grease leakage prevention lip 13 and the radial outer surface of the inner ring 11, and a gap is formed between the inlet lip 9 and the outer groove surface of the inner ring V-shaped groove 10.
When the anti-leakage grease lip is used, the anti-leakage grease lip 13 is mainly used for preventing grease of the bearing from leaking, the grease inside the bearing is thrown to the inner side of the sealing ring under the stirring action and the centrifugal force action of the retainer and the steel ball assembly, flows into the inclined plane of the anti-leakage grease lip 13 along the inner side of the sealing ring, and further enters the inside of the bearing along the inclined plane of the anti-leakage grease lip 13 to form a circulation loop of the grease inside the bearing, and the anti-leakage grease lip is mainly characterized in that the distance L2= 0.1-0.15 mm between the inner diameter of the anti-leakage grease lip 13 and the inner ring flange, and the anti-leakage grease lip 13 and the inner ring flange run relatively to form an. Due to heat generation and manufacturing tolerances during bearing operation, an excessively small clearance L2 may cause the inner diameter of the seal lip 13 to contact the inner ring rib, further increasing the friction torque and heat generation of the bearing. An excessively large clearance L2 may result in an air wedge not being formed and not being effective in preventing leakage of grease.
The radial angle between the waist part 8 of the sealing ring and the rigid framework 4 is 8-15 degrees. The thickness of the seal ring waist 8 mainly affects the moment of the seal ring and the following ability of its main lip. The sealing ring is mainly characterized in that the thickness L of the waist part 8 of the sealing ring is 0.3-0.5 mm.
The outer diameter side 14 of the rigid framework 4 is provided with an upper axial part 4-1 which is obliquely arranged corresponding to the head part 3 of the sealing ring, the upper axial part 4-1 is integrally connected with the upper radial part 4-2, and the radial outer end of the upper radial part 4-2 is provided with a ridge-shaped extension part 4-3 so as to realize the fastening of sealing rubber at the corresponding part, increase the rigidity of the head part 3 of the sealing ring, further improve the acting force between the head part and the V-shaped groove 2 of the outer ring and prevent the head part from sliding relative to the outer ring 1 in high-speed rotation; meanwhile, the problems that when the internal pressure of the bearing caused by temperature rise is smaller than the external pressure, the sealing ring is concave due to the external pressure and the like are solved. In addition, in order to ensure that the outer ring can be easily pressed in the V-shaped groove 2 of the outer ring 1, the distance L1 between the outer diameter of the framework and the entrance diameter of the V-shaped groove of the outer ring is more than or equal to 0.3 mm.
The inner diameter side 6 of the rigid framework 4 is provided with an inclined side supporting plate, the sealing ring waist part 8 extends to the outer end of the side supporting plate, and the main function of the sealing ring waist part is to improve the rigidity of the sealing ring lip part 7 and further improve the following performance of the sealing ring lip part 7. The radial distance between the inner diameter of the rigid framework 4 and the waist part 8 of the sealing ring is 0.3-0.5 mm. The sealing rubber 5 is provided with an elastic groove 15 corresponding to the axially outer end of the seal ring head 3.
The internal parameters of the main lip 12 relate to the sealing performance and the high-speed performance of the bearing, and the interference magnitude delta M of the main lip 12 and the inner ring V-shaped groove 10 is = 0.2-0.25 mm. In order to ensure the sealing performance of the bearing, the minimum value delta M of the interference is required to be larger than 0.1mm on the basis of considering the actual machining tolerance and the internal clearance of the bearing. In order to improve the pressure of the contact part of the seal lip 12 and the V-shaped groove of the inner ring and prevent the seal lip 12 from being rapidly worn due to excessive pressure, the head part fillet of the main lip 12 is more than or equal to 0.1mm and more than or equal to 0.03 mm.
The sealing ring designed according to the technical scheme is modeled, calculated and analyzed on a computer. And obtaining the contact force and contact stress curve between the seal ring main lip 12 and the inner ring V-shaped groove under different outer ring rotating speeds. As shown in fig. 4 and 5. As can be seen from the figure, the contact force and the contact pressure are basically kept unchanged in the whole outer ring rotating speed range (0-18000 RPM).
The ball bearing with the model 6203 is manufactured according to the design scheme, after the test that the rotating speed of the outer ring is 18000RPM is carried out, the bearing is disassembled and the slice of the sealing ring is investigated and analyzed, and the sealing ring is free of abrasion, rubber tearing and the like.
The above description has been given only for the details of the presently novel preferred embodiment. Various modifications and additions may be made to the described embodiments or may be substituted in a similar manner by those skilled in the art to which the present invention pertains, and the technical scope of the present invention should be determined by the claims, and the meaning equivalent to the contents of the claims and all modifications within the scope thereof should be included.
Claims (9)
1. The utility model provides a high-speed outer lane swivel ball bearing's sealing device, sealing washer body set up between outer lane (1) and inner circle (11) of bearing, and the outer lane V type groove (2) interference fit that sets up on the radial outside of sealing washer body and outer lane (1), its characterized in that: the sealing ring body comprises a rigid framework (4) and sealing rubber (5) vulcanized on the rigid framework (4);
the radial outer end of the sealing ring body is constructed into a sealing ring head (3), the radial inner end of the sealing ring body is constructed into a sealing ring lip (7), the sealing ring lip (7) comprises a leakage-proof grease lip (13), a main lip (12) and an inlet lip (9), wherein the leakage-proof grease lip (13) is arranged at the axial inner end of the radial inner side of the sealing ring body, the radial inner side of the sealing rubber (5) is integrally connected with a sealing ring waist part (8), and the main lip (12) and the inlet lip (9) are integrally connected with the radial inner end of the sealing ring waist part (8);
the main lip (12) is abutted against the surface of a groove body of an inner ring V-shaped groove (10) arranged on the inner ring (11), a gap is formed between the grease leakage prevention lip (13) and the radial outer surface of the inner ring (11), and a gap is formed between the inlet lip (9) and the outer groove surface of the inner ring V-shaped groove (10).
2. A high-speed outer race rolling ball bearing sealing device according to claim 1, characterized in that: the radial angle between the seal ring waist (8) and the rigid framework (4) is 8-15 degrees, and the thickness L of the seal ring waist (8) is 0.3-0.5 mm.
3. A high-speed outer race rolling ball bearing sealing device according to claim 1, characterized in that: the outer diameter side (14) of the rigid framework (4) is obliquely provided with an upper axial part (4-1) corresponding to the head part (3) of the sealing ring, the upper axial part (4-1) is integrally connected with an upper radial part (4-2), and the radial outer end of the upper radial part (4-2) is provided with a ridge-shaped extension part (4-3) so as to realize the fastening of sealing rubber at the corresponding part; the internal diameter side (6) of rigid skeleton (4) sets up the collateral branch fagging of slope form, and sealing washer waist (8) extend in the outer end of collateral branch fagging.
4. A high-speed outer race rolling ball bearing sealing device according to claim 1, characterized in that: the sealing rubber (5) is provided with an elastic groove (15) corresponding to the axial outer end of the sealing ring head (3).
5. A high-speed outer race rolling ball bearing sealing device according to claim 1, characterized in that: the interference magnitude delta A of the matching of the sealing ring head (3) and the outer ring V-shaped groove (2) is more than or equal to 0.1 mm.
6. A high-speed outer race rolling ball bearing sealing device according to claim 1, characterized in that: the distance L1 between the rigid framework (4) and the inlet diameter of the outer ring V-shaped groove (2) is more than or equal to 0.3 mm.
7. A high-speed outer race rolling ball bearing sealing device according to claim 1, characterized in that: the interference magnitude delta M of the main lip (12) and the inner ring V-shaped groove (10) is = 0.2-0.25 mm.
8. A high-speed outer race rolling ball bearing sealing device according to claim 1, characterized in that: the head part fillet of the main lip (12) is more than or equal to 0.1mm and R is more than or equal to 0.03 mm.
9. A high-speed outer race rolling ball bearing sealing device according to claim 1, characterized in that: the difference between the area and the moment of inertia of the main lip side area (B) and the inlet lip side area (A) of the sealing ring head (7) is less than or equal to 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736698.9A CN111765172A (en) | 2020-07-28 | 2020-07-28 | Sealing device of high-speed outer ring rotary ball bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736698.9A CN111765172A (en) | 2020-07-28 | 2020-07-28 | Sealing device of high-speed outer ring rotary ball bearing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111765172A true CN111765172A (en) | 2020-10-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010736698.9A Pending CN111765172A (en) | 2020-07-28 | 2020-07-28 | Sealing device of high-speed outer ring rotary ball bearing |
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| CN (1) | CN111765172A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023184075A1 (en) * | 2022-03-28 | 2023-10-05 | 舍弗勒技术股份两合公司 | Conductive ring |
| CN116989065A (en) * | 2023-09-27 | 2023-11-03 | 万向钱潮股份公司 | Sealing assembly for bearing and hub bearing |
-
2020
- 2020-07-28 CN CN202010736698.9A patent/CN111765172A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023184075A1 (en) * | 2022-03-28 | 2023-10-05 | 舍弗勒技术股份两合公司 | Conductive ring |
| CN116989065A (en) * | 2023-09-27 | 2023-11-03 | 万向钱潮股份公司 | Sealing assembly for bearing and hub bearing |
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