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1. Electric Bicycle Bearings - Functions and Selection Guide for Covers
2. Electric Bicycle Bearings - Types of Covers
3. Electric Bicycle Bearings - Considerations for Types of Covers
4. Electric Bicycle Bearings - Applications of Covers
The bearing cover on an electric bicycle plays a crucial role in protecting the bearings and enhancing the riding experience. It not only extends the lifespan of the bearings but also improves the safety of the vehicle. This article will introduce the applications and selection guide of various types of bearing covers on electric bicycles, helping you choose the most suitable bearing cover.
When discussing the types of bearing covers, "OPEN," "ZZ," and "2RS" are common designations used to indicate different levels of enclosure and sealing performance of the bearings. These designations are used to describe whether the bearing outer cover has an open or sealed design, as well as the method of sealing.
"OPEN" indicates that the bearing cover is open, without any sealing, exposing the interior of the bearing. This type of bearing cover is typically used in internal machinery or in applications where better heat dissipation is required, such as in high-temperature environments. However, this also means that the bearings are more susceptible to dust, water, and dirt, requiring more frequent maintenance and upkeep.
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"ZZ" signifies that the bearing cover has metal dust shields, which is a non-contact sealing design. The metal dust shields prevent dust and dirt from entering the interior of the bearing while retaining the lubricant within, thereby reducing maintenance requirements. However, this design is not suitable for use in humid or highly dusty environments, as the metal dust shields may not effectively prevent water from entering.
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"2RS" represents that the bearing outer cover has double rubber seals, which is a type of contact sealing design. The rubber seals offer excellent dust and water resistance, effectively preventing the ingress of dust, water, and dirt while retaining the lubricant inside the bearing. This design is suitable for use in harsh environments, providing a longer lifespan and requiring less maintenance.
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| Performance Metric | ZZ | 2RS |
|---|---|---|
| Low Friction | √ | △ |
| Speed | √ | △ |
| Sealing Capability | △ | √ |
| Durability | △ | √ |
| Dust and Debris Resistance | △ | √ |
| Maintenance Requirement | △ | √ |
Taking the usage conditions into comprehensive consideration, selecting an appropriate type of outer cover will contribute to ensuring the stable and reliable operation of the bearings over long-term use, thereby providing a more enjoyable and secure riding experience.
Bearing covers are widely used in various parts of electric bicycles, mainly encompassing the following aspects:
I would recommend using 2RS rubber sealed covers. Hub bearings are located inside the wheels and are susceptible to the effects of dust, water, and dirt. By using 2RS rubber sealed covers, you can effectively prevent the infiltration of these external elements, ensuring that the bearing's internal lubricant remains uncontaminated and providing an extended lifespan.
Pedal bearings are installed between the pedal and the crank arm, and their crucial function is to ensure the smooth rotation of the pedal. Using a cover with ZZ metal dust shields can provide a more stable and reliable riding experience.
Steering bearings are located between the front fork and the handlebar stem, making them more susceptible to the effects of dust and water. It is recommended to use 2RS rubber sealed covers, as this will provide good dust and waterproof performance, ensuring smooth and safe operation of the bearings.
Transmission bearings are commonly used to control the rotation of the transmission, ensuring smooth gear shifting. Using a cover with ZZ metal dust shields ensures the proper operation of the transmission.
Further Reading:
Electric Bicycle Bearing Guide: Key Components and Standard Sizes of Electric Bicycle Bearings.
Common Materials Used in Electric Bicycle Bearings
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