What’s the working principle of bike wheel bearing?

Nowadays, many bicycles are basically not carrying people, and the wheels will make abnormal noise after riding for a period of time. Later, through the answer of the maintenance master, I realized that there was a problem with the bike wheel bearing, and I needed to disassemble the damaged bike wheel bearing and replace it with a new bike wheel bearing. Is the bearing problem?

What is the working principle of bike wheel bearing?

Both the front and rear wheel bearings rotate on the outer ring, which is equivalent to a double row angular contact ball bearing.

The rear wheel bearing mainly bears the rotating load; the front wheel bearing mainly bears the fixed load.

The bicycle is driven by a chain. The pedal drives the front sprocket and transmits it to the rear sprocket. The chain gives the rear wheel a torque, which drives the rear wheel to rotate. The rear wheel and the bike wheel bearing outer ring are fixed together. The steel ball rotates and revolves, and the inner ring still.

The forward force gives a torque to the front wheel. The outer ring of the front wheel bike wheel bearing rotates together with the front wheel. The steel ball rotates and revolves to move forward. When turning, the front wheel bike wheel bearing bears the tilting torque on one side.

Because a safety clutch is installed on the bike wheel bearing (consisting of star wheels, balls, springs, etc.), when pedaling forward, there is a spring against the balls to make the bike wheel bearing and the gear chain run synchronously. When falling backward, The spring is squeezed to shorten and the ball moves backward, so the chain gear rotates backward, and the bike wheel bearing (wheel) does not rotate

Reasons for using balls instead of bearings for bicycle wheels:
1. The loose ball (ball) structure is easy to maintain, and the wheel set using industrial bearings requires special tools to be disassembled when replacing the bearings.
2. The loose ball (ball) structure is actually a kind of bearing, called angular contact bearing, whose mechanical properties are more perfect than industrial bearings. It is just that the sealing performance is poor and it is easy to enter the dust and debris.
3. The steering performance of wheels with loose ball (ball) structure is better

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