Do you know the working principle of ball bearing for bicycles?

In our previous life, as long as we traveled, we couldn't do without our two-eight bar bike. At that time, the most famous bike was the Flying Pigeon brand bike, which was still durable. Bring four or five people. The problem is that until now many bicycles basically can't bring people to talk, and there will be rattling noises after riding for a while. Later, through the teacher's answer, I realized that the bearing had a problem. I need to remove the bad bearing and replace it with a new bearing. This is why the previous bicycle is durable and the current bicycle is always bearing problems. What are the working principles of bearings?

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

The rear wheel bearings mainly bear rotating loads; the front wheel bearings mainly bear fixed loads.

The bicycle is a chain drive. 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 bearing outer ring are fixed together. The steel ball rotates and revolves, and the inner ring is stationary.

The forward force gives a torque to the front wheel. The outer ring of the front wheel ball bearing for bicycles rotates with the front wheel. The steel ball rotates and revolves and walks forward.

When turning, the front wheel ball bearing for bicycles bears the tilting torque on one side.

Because a safety clutch (composed of star wheels, balls, springs, etc.) is installed on the bearings, when pedaling forward, there is a spring against the balls to synchronize the operation of the ball bearing for bicycles and the gear chain. When backward, the spring is squeezed When it shortens, the balls retreat, so the chain gear rotates backward, and the ball bearing for bicycles (wheel) does not rotate

Reasons why bicycle wheels use balls instead of bearings:

1. The loose ball (ball) structure is easy to maintain, and the wheel set using industrial bearings requires special tools before disassembly and assembly.

2. The loose ball (ball) structure is actually also a kind of bearing, called angular contact bearing, and its mechanical properties are more perfect than industrial bearings. Only the poor sealing performance is easy to enter the dust and debris.

3. Wheels with loose beads (ball) structure have better steering performance.

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