At present, most of the hub bearings of small passenger cars are of closed one-piece structure. The bearings of this structure have been added with enough grease in the manufacturing process, so there is no need to add grease in the use process. How long can car bearings be used? Because of the closed structure, this kind of bearing does not need maintenance, even if we want to add grease is very troublesome.

In fact, the damage of our bearings is not due to the lack of grease to a large extent, but because the bearing material is not good, the rolling surface is damaged, resulting in the bearing noise in the process of rotation. If there is no problem with the bearing itself, the design service life of the bearing of this structure can reach more than 200000 km. Therefore, the bearing of this structure should not be maintained and replaced if it is broken That's fine.

In fact, for the bearings of automobile parts, our current family cars and automobile accessories bearings do not need maintenance, because for our family cars, its bearing load is not very large, and because of the progress of bearing design technology, our family car bearings can be designed as maintenance free bearings

This is the rear wheel bearing we replaced from the family car. This kind of bearing is not required to be maintained!

But we also have bearings that need to be maintained. For example, our pickup trucks and a small number of heavy off-road vehicles use bearings that need maintenance

This kind of bearing is the bearing that needs to be maintained and oiled. It is generally installed on our heavy-duty vehicles and can bear more load! However, in order to ensure its service life, it needs to be maintained every tens of thousands of kilometers. Generally, it is disassembled and cleaned, and then re greased to ensure the bearing lubrication and heat dissipation under high load.

So as a friend, why some bearings do not need maintenance?

In fact, because of this kind of bearing, its design concept is not the same. His goal is to design bearings as maintenance free auto parts. And our family car usually use the load is not very big, so the normal family car, in 100000 to 200000 km or so, may only replace the car parts bearing.

The last oil seal will also be used in our car parts bearings.

Our maintenance free auto parts bearing, it is equivalent to constitute an assembly. It contains lubricating oil, as well as extremely strong bearing parts. Use our oil seal to seal the lubricating oil in the whole bearing body. When we drive, the lubricating oil will lubricate our bearing body. If we use it for a long time, the temperature of the bearing will be higher and the lubricating oil will become thinner. Through our oil seal, the lubricating oil will be sealed in our bearing body to prevent it from flowing out

After taking us out of the car, the lubricating oil will slowly cool down, and the viscosity will become higher. In this way, we can repeatedly lubricate our bearings. In this way, bearings can be used for more than 100000 km.

And our kind of bearing, its design is very precise, because in order to prevent the lubricating oil from flowing out, so if you want to maintain it, it will be very difficult, and it will also affect the sealing of our entire bearing body!

So we don't need to maintain the bearings here. We can replace them directly after using about 100000 km, and the price is not expensive! Dozens of yuan to two or three hundred yuan!

Now auto parts bearings generally do not need maintenance. Because the bearing is formed by steel parts through processing, quenching process, so that its surface layer of metal film is very hard and wear-resistant.

There are many bearings used in auto parts, such as conical, cylindrical and ball shaped. It's too complicated to say that the categories 1, 2, 3, 4 that start with numbers are different. If it's a professional, it's very simple. Therefore, I can only tell you that there are oil seals on both sides of the bearing, oil seals on one side and snap ring groove on the other.

Automobile accessories bearings are mainly lubricated by oil (such as crankshaft bearing), grease lubrication (front wheel bearing), gear oil (gearbox and rear axle inner bearing). The rear wheels are lubricated by car grease and gear oil.

After the bearing is lubricated, the friction force will be reduced and the temperature will be lowered. Generally speaking, it is OK to drive 200000 km. Therefore, the general vehicle is not required to maintain the bearing.

However, attention should be paid to several parts of the engine. The engine belt is tight and the front and rear wheel bearings are damaged due to long-term high-speed operation, especially affected by environmental factors.

In fact, no maintenance doesn't mean it won't break down. Any metal has fatigue. Especially when the quality of lubricating oil decreases or decreases, the bearing surface will be ablated and damaged.

Now most of the inner and outer oil seals of vehicle bearings are protected by iron sheet, which is not easy to leak oil. Once damaged, replace the bearing components.

In a word, when driving, pay attention to some abnormal conditions of the vehicle, such as wheel vibration, noise, etc., and pay attention to the bearing.