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For common family cars, why can the wheel bearings be used for a long time without maintenance?

wallpapers Tech 2020-10-25
The current automobile wheel bearings are maintenance-free. For family cars, its bearing load is not very large, so it will take a long time. For example, the problem of some molded bearings is the tire belt, which must be replaced after 70,000 to 80,000 kilometers. Because this is maintenance-free, there is no way to maintain it. If you don’t change it, the sound will be awkward. Of course, there are also maintainable bearings. The maintainable life is basically very long. Maintainable models such as pickup trucks and Mercedes-Benz (some models) No) the front wheels, generally adjustable bearings sway left and right. If there is a loose clearance, then maintenance is required. After maintenance, apply some grease, most Mercedes-Benz runs for a long time will be a little loose.
Wheel axle bearings are usually composed of two sets of opposed tapered roller bearings or ball bearings, which are tightly structured and strong, and are lubricated by high-grade grease, plus three inner and outer three layers of seal protection. Sufficient grease is added, the seal design on both sides of the bearing is also very good, the consumption of grease is also very small, so there is no need to add grease during use, which is designed as a maintenance-free bearing.
The cost of replacing the entire bearing is getting lower and lower. Generally, the price of a bearing ranges from tens to hundreds of yuan. In addition, if the bearing cannot be replaced due to excessive maintenance or rust or improper operation, the flange assembly can only be replaced directly with a little more money.
When designing a wheel hub bearing, it is generally necessary to guarantee a mileage of 200,000 to 300,000 kilometers. The negative pressure of the bearing is small, basically rarely exceeding 300,000 kilometers. If the cost is increased to ensure that its life of more than 500,000 kilometers is no problem.

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