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Why are rolling bearings not used for engine crankshafts, and why are sliding bearings used instead?

Release time:

2023-07-25

Nowadays, society is developing rapidly, and technology is constantly advancing. The most evident manifestation of this is probably the gradual popularization of automobiles!

Nowadays, society is developing rapidly, and technology is constantly advancing. The most evident manifestation of this is the gradual popularization of cars! As people's incomes slowly increase, many families, for the convenience of travel or work, have purchased their own small cars based on a certain economic capability and stable income. After all, there are many people who drive but few who understand cars. Today, I would like to share some small knowledge about cars with everyone. We all know that the most core component of a car is the engine. The quality of an engine depends on the condition of its internal components. Recently, a car owner online has been struggling with this question: Why is the crankshaft designed as a sliding bearing rather than a rolling bearing? Let's discuss this issue together!

First, let's briefly introduce these two types of bearings. A sliding bearing works under sliding friction and is also known as a bearing shell. This type of bearing has high reliability and will not seize immediately during wear! It operates very smoothly and reliably without producing much noise. In contrast to sliding bearings, rolling bearings simply change sliding friction into rolling friction, still aiming to reduce friction loss.

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