Waterproof deep groove ball bearing

Abstract

The utility model discloses a waterproof deep groove ball bearing, which comprises an outer ring, an inner ring, a steel ball, a retainer, a first sealing ring and a second sealing ring, the retainer is arranged between the outer ring and the inner ring, the steel ball is arranged on the retainer, and the first sealing ring and the second sealing ring are respectively arranged on two axial sides of the bearing. A third sealing ring is arranged on the axial outer side of the first sealing ring, an inner lip of the third sealing ring is in contact sealing fit with the inner ring, an outer lip of the third sealing ring is in interference fit with the outer ring, a first sealing lip is arranged in the middle of the axial outer surface of the first sealing ring, and the first sealing lip is in interference fit with a framework of the third sealing ring. After the bearing is mounted, the third sealing ring is close to the oil seal, and a double-piece sealing structure formed by the third sealing ring and the first sealing ring can effectively prevent water from entering the bearing from the oil seal side, so that the service life of the bearing is remarkably prolonged, and adverse cases caused by water entering the bearing are reduced; and meanwhile, the waterproof deep groove ball bearing has the characteristics of small friction torque and low cost.

Description

Technical Field

[0001] The utility model relates to a bearing, in particular to a waterproof deep groove ball bearing. Background Art

[0002] Due to the limitations of the operating environment, some bearings are waterproofed through waterproof structures such as oil seals. For example, in the hub motor bearings of electric motorcycles, the bearings and oil seals are separately installed in the bearing seat. The oil seal is located on one side of the bearing, and the inner diameter of the oil seal has an interference fit with the motor shaft, thus achieving a waterproof function. The other side of the bearing away from the oil seal is usually installed inside a sealed structure such as the motor cavity, and usually does not require a waterproof structure design. The waterproof bearings on the market are sealed by an oil seal combined with the sealing ring that comes with the bearing. The waterproof effect is poor and cannot effectively prevent moisture from entering the interior of the bearing. In addition, due to wear of the oil seal, the sealing performance of the oil seal is reduced, resulting in frequent cases of premature failure of the bearing due to internal water ingress during wading. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a waterproof deep groove ball bearing in view of the deficiencies in the prior art. The bearing has the characteristics of good waterproof effect, long service life, small friction torque and low cost.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: a waterproof deep groove ball bearing, the bearing comprising an outer ring, an inner ring, a steel ball, a retainer, a first sealing ring and a second sealing ring, the retainer is installed between the outer ring and the inner ring, the steel ball is installed on the retainer, the first sealing ring and the second sealing ring are respectively arranged on both sides of the axial direction of the bearing, the inner lip of the first sealing ring and the inner lip of the second sealing ring are respectively in contact and sealed cooperation with the inner ring, the outer lip of the first sealing ring and the outer lip of the second sealing ring are respectively interference fit with the outer ring, a third sealing ring is provided on the axial outer side of the first sealing ring, the inner lip of the third sealing ring is in contact and sealed cooperation with the inner ring, the outer lip of the third sealing ring is interference fit with the outer ring, a first sealing lip is provided in the middle of the axial outer surface of the first sealing ring, and the first sealing lip is interference fit with the skeleton of the third sealing ring.

[0005] After the waterproof deep groove ball bearing of the utility model is installed, the third sealing ring is close to the oil seal. The double-piece sealing structure formed by the third sealing ring and the first sealing ring can effectively prevent moisture from entering the bearing from the oil seal side, significantly improving the service life of the bearing and reducing adverse cases caused by water entering the bearing. At the same time, the waterproof deep groove ball bearing has the characteristics of small friction torque and low cost.

[0006] Specifically, the outer lip of the third sealing ring provides a preliminary barrier against external dust, impurities, and water entering the bearing, serving as the first line of defense. The first sealing lip of the first sealing ring creates an interference fit with the framework of the third sealing ring, serving as the second line of defense. These first and second lines of defense provide effective protection, preventing water and debris from entering the bearing.

[0007] Preferably, the outer ring, the first sealing ring, the inner ring, and the third sealing ring form an annular cavity, which is filled with grease. The grease filled in the annular cavity formed by the outer ring, the first sealing ring, the inner ring, and the third sealing ring provides lubrication, prevents wear of the outer lip of the third sealing ring, the first sealing lip, and the second sealing lip, thereby ensuring sealing performance. The grease also provides a certain waterproof effect.

[0008] Preferably, the first sealing lip is inclined from the first sealing ring toward the radially outer side of the bearing to prevent water and debris that have passed the first line of defense from further entering the radially inner side of the bearing.

[0009] Preferably, the inner lip of the first sealing ring includes a second sealing lip and a third sealing lip. The second sealing lip is adjacent to the third sealing ring. A notch is provided in the circumference of the inner ring. The second sealing lip has an interference fit with the radial surface of the notch, and the third sealing lip has an interference fit with the axial surface of the notch. With the first and second lines of defense providing good waterproofing, the second sealing lip on the first sealing ring serves as the third line of defense, and the third sealing lip serves as the fourth line of defense. Furthermore, the first, second, and third sealing lips form a labyrinthine waterproof structure, further enhancing the bearing's waterproofing effectiveness and effectively preventing grease from leaking from the bearing.

[0010] Preferably, the second sealing lip and the third sealing lip are each obliquely disposed from the first sealing ring toward the radially inner side of the bearing. The second sealing lip prevents water and debris that have passed through the second line of defense from further entering the axial inner side of the bearing, and the third sealing lip prevents water and debris that have passed through the third line of defense from further entering the axial inner side of the bearing, thereby ensuring a waterproof effect.

[0011] Preferably, a first annular groove is provided on the inner surface of the outer ring, and a second annular groove is provided on the outer surface of the inner ring. The outer diameter of the second annular groove is smaller than the diameter of the radial surface of the notch. The outer lip of the first sealing ring contacts and seals with the surface of the first annular groove, and the inner lip of the third sealing ring contacts and seals with the surface of the second annular groove. The design of the first and second annular grooves can ensure the positioning effect of the first and third sealing rings.

[0012] Compared with the prior art, the present invention has the following advantages: after the waterproof deep groove ball bearing of the present invention is installed, the third sealing ring is close to the oil seal, and the double-piece sealing structure formed by the third sealing ring and the first sealing ring can effectively prevent moisture from entering the bearing from the oil seal side, significantly improving the service life of the bearing and reducing adverse cases caused by water entering the bearing. At the same time, the waterproof deep groove ball bearing has the characteristics of low friction torque and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a rendering of the waterproof deep groove ball bearing after being installed on the motor shaft in the embodiment;

[0014] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0015] The specific reference numerals in the figures are as follows:

[0016] 1-outer ring, 11-first annular groove, 2-inner ring, 21-second annular groove, 22-notch, 23-radial surface of the notch, 24-axial surface of the notch, 31-steel ball, 32-retainer, 4-first sealing ring, 41-inner lip of the first sealing ring, 42-outer lip of the first sealing ring, 43-first sealing lip, 44-second sealing lip, 45-third sealing lip, 5-second sealing ring, 51-inner lip of the second sealing ring, 52-outer lip of the second sealing ring, 6-third sealing ring, 61-inner lip of the third sealing ring, 62-outer lip of the third sealing ring, 7-ring cavity, 81-oil seal, 82-bearing seat, 83-motor shaft. DETAILED DESCRIPTION

[0017] The following is a further detailed description of the present invention in conjunction with the accompanying drawings. All structures and components not limited in the present invention are based on conventional techniques in the art.

[0018] The waterproof deep groove ball bearing of the embodiment, such as Figure 1 and Figure 2As shown, the bearing includes an outer ring 1, an inner ring 2, a steel ball 31, a retainer 32, a first sealing ring 4 and a second sealing ring 5. The retainer 32 is installed between the outer ring 1 and the inner ring 2, and the steel ball 31 is installed on the retainer 32. The first sealing ring 4 and the second sealing ring 5 are respectively arranged on both sides of the axial direction of the bearing. The inner lip 41 of the first sealing ring 4 and the inner lip 51 of the second sealing ring 5 are in contact and sealed with the inner ring 2 respectively, and the outer lip 42 of the first sealing ring 4 and the outer lip 52 of the second sealing ring 5 are respectively interference fit with the outer ring 1. A third sealing ring 6 is provided on the axial outer side of the first sealing ring 4. The inner lip 61 of the third sealing ring 6 is in contact and sealed with the inner ring 2, and the outer lip 62 of the third sealing ring 6 is interference fit with the outer ring 1. A first sealing lip 43 is provided in the middle of the axial outer surface of the first sealing ring 4, and the first sealing lip 43 is interference fit with the skeleton of the third sealing ring 6. The outer ring 1, the first sealing ring 4, the inner ring 2 and the third sealing ring 6 form an annular cavity 7, and the annular cavity 7 is filled with grease.

[0019] In this embodiment, the first sealing lip 43 is inclined from the first sealing ring 4 to the radial outside of the bearing. The inner lip 41 of the first sealing ring 4 includes a second sealing lip 44 and a third sealing lip 45. The second sealing lip 44 is close to the third sealing ring 6. A notch 22 is provided in the circumference of the inner ring 2. The second sealing lip 44 is interference fit with the radial surface 23 of the notch 22. The third sealing lip 45 is interference fit with the axial surface 24 of the notch 22. The second sealing lip 44 and the third sealing lip 45 are respectively inclined from the first sealing ring 4 to the radial inside of the bearing.

[0020] In this embodiment, a first annular groove 11 is provided on the inner surface of the outer ring 1, and a second annular groove 21 is provided on the outer surface of the inner ring 2. The outer diameter of the second annular groove 21 is smaller than the diameter of the radial surface 23 of the notch portion 22. The outer lip 42 of the first sealing ring 4 is in contact and sealing cooperation with the surface of the first annular groove 11, and the inner lip 61 of the third sealing ring 6 is in contact and sealing cooperation with the surface of the second annular groove 21.

[0021] The effect of the above waterproof deep groove ball bearing after installation on the motor shaft is shown in Figure 1 .like Figure 1As shown, the bearing and oil seal 81 are separately mounted within a bearing housing 82. The inner ring 2 is mounted on a motor shaft 83. The oil seal 81 is located on one side of the bearing, with its inner diameter forming an interference fit with the motor shaft 83. The third sealing ring 6 is positioned adjacent to the oil seal 81. The outer lip 62 of the third sealing ring 6 initially prevents external dust, impurities, and water from entering the bearing, serving as the first line of waterproofing. The first sealing lip 43 of the first sealing ring 4, which forms an interference fit with the framework of the third sealing ring 6, serves as the second line of waterproofing. The second sealing lip 44 of the first sealing ring 4 serves as the third line of waterproofing, and the third sealing lip 45 serves as the fourth line of waterproofing. Together, the first, second, and third sealing lips 43, 44, 45 form a labyrinthine waterproof structure, further enhancing the bearing's waterproofing and effectively preventing grease from escaping. Furthermore, the grease filled within the annular cavity 7 provides lubrication, preventing wear on the outer lip 62, first, second, and second sealing lips 43, 44 of the third sealing ring 6, ensuring sealing performance. The grease also contributes to a certain degree of waterproofing. The double-piece sealing structure formed by the third sealing ring 6 and the first sealing ring 4 can effectively prevent moisture from entering the bearing from the oil seal 81 side, significantly improving the service life of the bearing and reducing adverse cases caused by water entering the bearing. At the same time, the waterproof deep groove ball bearing has the characteristics of low friction torque and low cost.

[0022] In order to accommodate the double-piece sealing structure composed of the third sealing ring 6 and the first sealing ring 4, the axial width of the above-mentioned waterproof deep groove ball bearing is widened by about 1.5 mm compared with the conventional deep groove ball bearing, and the internal grease filling space of the bearing is increased by about 10% to improve the grease lubrication life.

Claims

1. A waterproof deep groove ball bearing, comprising an outer ring, an inner ring, a steel ball, a retainer, a first sealing ring, and a second sealing ring, wherein the retainer is mounted between the outer ring and the inner ring, the steel ball is mounted on the retainer, the first sealing ring and the second sealing ring are respectively arranged on both sides of the axial direction of the bearing, the inner lip of the first sealing ring and the inner lip of the second sealing ring are respectively in contact and sealed cooperation with the inner ring, and the outer lip of the first sealing ring and the outer lip of the second sealing ring are respectively in interference fit with the outer ring, characterized in that: A third sealing ring is provided on the axial outer side of the first sealing ring, the inner lip of the third sealing ring is in contact and sealing fit with the inner ring, the outer lip of the third sealing ring is interference fit with the outer ring, and a first sealing lip is provided in the middle of the axial outer surface of the first sealing ring, and the first sealing lip is interference fit with the skeleton of the third sealing ring.

2. A waterproof deep groove ball bearing according to claim 1, characterized in that: The outer ring, the first sealing ring, the inner ring and the third sealing ring form an annular cavity, and the annular cavity is filled with lubricating grease.

3. The waterproof deep groove ball bearing according to claim 1, characterized in that: The first sealing lip is inclined from the first sealing ring toward the radial outer side of the bearing.

4. A waterproof deep groove ball bearing according to any one of claims 1 to 3, characterized in that: The inner lip of the first sealing ring includes a second sealing lip and a third sealing lip. The second sealing lip is close to the third sealing ring. A notch is provided in the circumference of the inner ring. The second sealing lip is interference fit with the radial surface of the notch, and the third sealing lip is interference fit with the axial surface of the notch.

5. The waterproof deep groove ball bearing according to claim 4, characterized in that: The second sealing lip and the third sealing lip are respectively inclined from the first sealing ring toward the radial inner side of the bearing.

6. The waterproof deep groove ball bearing according to claim 4, characterized in that: The inner surface of the outer ring is provided with a first annular groove, the outer surface of the inner ring is provided with a second annular groove, the outer diameter of the second annular groove is smaller than the diameter of the radial surface of the notch portion, the outer lip of the first sealing ring is in contact and sealing cooperation with the surface of the first annular groove, and the inner lip of the third sealing ring is in contact and sealing cooperation with the surface of the second annular groove.

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