Deep groove ball bearing for front wheel of electric scooter

Abstract

The utility model discloses a kind of deep groove ball bearings for electric skateboard front wheel, including bearing outer ring, bearing inner ring, steel ball, retainer, first sealing ring and second sealing ring, the surface of bearing outer ring has oxide film, the outer lip of first sealing ring and bearing outer ring interference fit, clearance between the outer diameter surface of inner lip and bearing inner ring and its axial outer side end face outer edge integrally provided with convex ring, stainless steel cover plate is pressed into bearing inner ring of its axial outer side end face, its inner diameter place and bearing inner ring radial inner side step interference fit, and its radial inner side at chamfered portion of bearing outer ring, clearance width between convex ring and stainless steel cover plate is 0.1~0.2 mm.The bearing can effectively prevent the end face and chamfered portion of bearing outer ring from rusting by structured, multilevel sealing and rust-proof design, significantly reduce the premature failure of bearing caused by external mud, sand invasion, while controlling cost, significantly prolong the service life of bearing.

Description

Technical Field

[0001] This utility model relates to the field of bearings, specifically to a deep groove ball bearing for the front wheel of an electric scooter. Background Technology

[0002] In the design of electric scooter front wheels, due to cost control and friction reduction considerations, the oil seal structure on the outside of the bearing is usually omitted, which leads to the following two problems for the front wheel bearing: 1) Since the end faces and chamfered parts of the inner and outer rings of the bearing are directly exposed to the external environment, they are prone to corrosion; 2) Due to the lack of oil seal protection, foreign objects such as mud, water, and sand can easily enter the bearing and accumulate at the inner lip of the outer seal ring. Long-term action will cause wear and sealing failure of the inner lip of the seal ring, which will cause the bearing to fail prematurely due to water ingress and impurities.

[0003] Currently, the front wheel bearings of electric scooters rely primarily on the rust-preventive oil applied at the factory to protect the end faces and chamfered areas of the inner and outer rings. However, this rust-preventive oil film is easily damaged during assembly and use, making its rust-preventive effect unsustainable and failing to fundamentally solve the problems of rust and seal failure in the front wheel bearings of electric scooters. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a deep groove ball bearing for the front wheel of an electric scooter, which is designed to effectively prevent corrosion of the end face and chamfer of the outer ring of the bearing, and significantly reduce premature bearing failure caused by the intrusion of external mud, water and sand, thereby significantly extending the service life of the bearing while controlling costs.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a deep groove ball bearing for the front wheel of an electric scooter, comprising an outer ring, an inner ring, steel balls, a retainer, a first sealing ring, and a second sealing ring. The retainer is installed between the outer ring and the inner ring, and the steel balls are installed on the retainer. The first sealing ring and the second sealing ring are respectively located on the axial outer side and the axial inner side of the bearing. The surface of the outer ring has an oxide film formed by blackening treatment. The outer lip of the first sealing ring is interference-fitted with the outer ring, and there is a gap between the inner lip of the first sealing ring and the outer diameter surface of the inner ring. A raised ring is integrally provided on the outer edge of the axial outer end face of the first sealing ring. A stainless steel cover plate is press-fitted onto the axial outer end face of the inner ring. The inner diameter of the stainless steel cover plate is interference-fitted with the radial inner step of the inner ring. The stainless steel cover plate is located radially inner to the chamfered portion of the outer ring, and the outer diameter of the stainless steel cover plate is opposite to the raised ring. The gap width between the raised ring and the stainless steel cover plate is 0.1~0.2 mm.

[0006] This utility model of deep groove ball bearing effectively improves bearing reliability and service life through the following multiple protective designs: First, a blackening treatment is applied to the outer ring surface to form an oxide film, significantly enhancing the overall corrosion resistance, especially providing effective protection for the end face and chamfered areas of the outer ring; Second, a stainless steel cover plate is added to isolate the axial outer end face of the inner ring from contact with air and external mud and water, thereby preventing corrosion of the inner ring; Third, a raised ring is integrally provided on the outer edge of the axial outer end face of the first sealing ring, and a gap of 0.1~0.2 mm is maintained between the raised ring and the stainless steel cover plate, which not only avoids the increased frictional resistance caused by the contact between the first sealing ring and the stainless steel cover plate during bearing operation, but also effectively prevents external sand and gravel from entering the bearing through this gap.

[0007] In summary, this utility model of deep groove ball bearing, through its structured, multi-layered sealing and rust-proof design, can effectively prevent corrosion of the bearing's outer ring end face and chamfered area, while significantly reducing premature bearing failure caused by the intrusion of external mud, water, sand, and gravel. It significantly extends the bearing's service life while controlling costs.

[0008] Preferably, a first sealing lip is integrally formed at the center of the outer axial end face of the first sealing ring. The first sealing lip is obliquely outward of the axial direction of the first sealing ring and makes interference contact with the stainless steel cover plate. By controlling the gap width between the convex ring and the stainless steel cover plate to prevent larger sand and gravel from entering the bearing, the interference contact of the first sealing lip creates a second line of defense for sealing. This effectively prevents external mud, water, and even finer sand and gravel particles from intruding into the bearing, further improving the bearing's sealing reliability and environmental adaptability.

[0009] As a further preferred embodiment, the interference fit between the first sealing lip and the stainless steel cover plate is 0.05~0.15mm.

[0010] As a further preferred embodiment, the space enclosed by the first sealing ring, the convex ring, the first sealing lip, and the stainless steel cover plate is filled with grease to further prevent external mud and water from entering the bearing, while providing continuous lubrication for the interference contact surface between the first sealing lip and the stainless steel cover plate, reducing the frictional resistance between the two, reducing the wear of the first sealing lip, and extending its sealing service life.

[0011] Preferably, the outer diameter surface of the bearing inner ring is provided with an annular groove, and there is a gap between the inner lip of the first sealing ring and the annular groove to form a labyrinth seal structure, so as to prevent the grease encapsulated inside the bearing for lubricating the steel balls from leaking outward. In addition, once the first sealing lip fails, the labyrinth seal structure can block external mud, water, sand and gravel from entering the bearing, thereby ensuring the sealing reliability of the bearing.

[0012] As a further preferred embodiment, the inner lip of the first sealing ring includes an integrally formed second sealing lip and a third sealing lip. The second sealing lip extends into the annular groove, and the third sealing lip is located axially inside the second sealing lip, obliquely facing axially inside the first sealing ring. The inner lip of the first sealing ring employs the aforementioned double-lip design of the second and third sealing lips, which further enhances the layering and reliability of the seal. While effectively preventing the leakage of internal bearing grease, it also strengthens the barrier against the intrusion of external mud, water, and sand, achieving a synergistic sealing effect in conjunction with the labyrinth seal structure.

[0013] Compared with the prior art, the present invention has the following advantages: The deep groove ball bearing for the front wheel of the electric scooter of the present invention, through a structured and multi-layered sealing and anti-rust design, can effectively prevent corrosion of the end face and chamfer of the outer ring of the bearing, and at the same time significantly reduce premature bearing failure caused by the intrusion of external mud, water and sand, thereby significantly extending the service life of the bearing while controlling costs. Attached Figure Description

[0014] Figure 1 This is a diagram illustrating the effect of installing a deep groove ball bearing on the front wheel of an electric scooter in this embodiment. Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 1 and Figure 2 The specific reference numerals in the attached figures are as follows: 1-Bearing outer ring, 11-Chamfered portion, 2-Bearing inner ring, 21-Radial inner step, 22-Annular groove, 3-Steel ball, 4-Retainer, 5-First sealing ring, 51-Raised ring, 52-First sealing lip, 53-Second sealing lip, 54-Third sealing lip, 6-Second sealing ring, 7-Stainless steel cover plate, 8-Grease. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Components or structures not limited in this invention employ conventional techniques in the art.

[0016] The deep groove ball bearing for the front wheel of the electric scooter in the embodiment, such as Figure 1 and Figure 2As shown, the bearing includes an outer ring 1, an inner ring 2, steel balls 3, a retainer 4, a first sealing ring 5, and a second sealing ring 6. The retainer 4 is installed between the outer ring 1 and the inner ring 2. The steel balls 3 are installed on the retainer 4. The first sealing ring 5 and the second sealing ring 6 are respectively located on the axial outer and axial inner sides of the bearing. The surface of the outer ring 1 has an oxide film formed by blackening treatment. The outer lip of the first sealing ring 5 is interference-fitted with the outer ring 1. A raised ring 51 is integrally provided on the outer edge of the axial outer end face of the first sealing ring 5. A stainless steel cover plate 7 is press-fitted onto the axial outer end face of the inner ring 2. The inner diameter of the stainless steel cover plate 7 is interference-fitted with the radial inner step 21 of the inner ring 2. The stainless steel cover plate 7 is located radially inner to the chamfered portion 11 of the outer ring 1. The outer diameter of the stainless steel cover plate 7 is opposite to the raised ring 51. The gap width w between the raised ring 51 and the stainless steel cover plate 7 is 0.1~0.2 mm.

[0017] In this embodiment, a first sealing lip 52 is integrally provided in the middle of the outer axial end face of the first sealing ring 5. The first sealing lip 52 is obliquely outward of the axial direction of the first sealing ring 5. The first sealing lip 52 is in interference contact with the stainless steel cover plate 7, and the interference amount is 0.10 mm. The space enclosed by the first sealing ring 5, the convex ring 51, the first sealing lip 52 and the stainless steel cover plate 7 is filled with grease 8.

[0018] In this embodiment, the outer diameter surface of the bearing inner ring 2 is provided with an annular groove 22. The inner lip of the first sealing ring 5 has a gap with the annular groove 22 and forms a labyrinth sealing structure. Specifically, the inner lip of the first sealing ring 5 includes an integrally formed second sealing lip 53 and third sealing lip 54. The second sealing lip 53 extends into the annular groove 22, and the third sealing lip 54 is located on the axial inner side of the second sealing lip 53. The third sealing lip 54 is inclined to the axial inner side of the first sealing ring 5.

[0019] The aforementioned deep groove ball bearing, through its structured, multi-layered sealing and rust-proof design, can effectively prevent corrosion of the end face and chamfered portion 11 of the outer ring 1, while significantly reducing premature bearing failure caused by the intrusion of external mud, water, sand, and gravel. This significantly extends the bearing's service life while controlling costs.

Claims

1. A deep groove ball bearing for the front wheel of an electric scooter, comprising an outer bearing ring, an inner bearing ring, steel balls, a retainer, a first sealing ring, and a second sealing ring, wherein the retainer is installed between the outer bearing ring and the inner bearing ring, the steel balls are mounted on the retainer, and the first sealing ring and the second sealing ring are respectively located on the axial outer side and the axial inner side of the bearing, characterized in that, The outer ring of the bearing has an oxide film formed by blackening treatment. The outer lip of the first sealing ring is interference-fitted with the outer ring of the bearing. There is a gap between the inner lip of the first sealing ring and the outer diameter surface of the inner ring of the bearing. A raised ring is integrally provided on the outer edge of the axial outer end face of the first sealing ring. A stainless steel cover plate is press-fitted onto the axial outer end face of the inner ring of the bearing. The inner diameter of the stainless steel cover plate is interference-fitted with the radial inner step of the inner ring of the bearing. The stainless steel cover plate is located radially inner to the chamfered part of the outer ring of the bearing. The outer diameter of the stainless steel cover plate is opposite to the raised ring. The gap width between the raised ring and the stainless steel cover plate is 0.1~0.2 mm.

2. The deep groove ball bearing for the front wheel of an electric scooter according to claim 1, characterized in that, A first sealing lip is integrally formed at the middle of the outer axial end face of the first sealing ring. The first sealing lip is obliquely outward of the axial direction of the first sealing ring and is in interference contact with the stainless steel cover plate.

3. A deep groove ball bearing for the front wheel of an electric scooter according to claim 2, characterized in that, The interference fit between the first sealing lip and the stainless steel cover plate is 0.05~0.15 mm.

4. The deep groove ball bearing for the front wheel of an electric scooter according to claim 2, characterized in that, The space enclosed by the first sealing ring, the raised ring, the first sealing lip, and the stainless steel cover plate is filled with grease.

5. A deep groove ball bearing for the front wheel of an electric scooter according to any one of claims 1 to 4, characterized in that, The outer diameter surface of the bearing inner ring is provided with an annular groove, and there is a gap between the inner lip of the first sealing ring and the annular groove to form a labyrinth seal structure.

6. The deep groove ball bearing for the front wheel of an electric scooter according to claim 5, characterized in that, The inner lip of the first sealing ring includes an integrally formed second sealing lip and a third sealing lip. The second sealing lip extends into the annular groove, and the third sealing lip is located axially inside the second sealing lip and is obliquely towards the axially inside the first sealing ring.

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