新聞

為什麼曲軸不用滾珠軸承？

Why don’t they use ballbearings on crankshafts? The main reasons for using plain bearings instead of rolling bearings for engine crankshafts include the following:

摩擦和潤滑：引擎曲軸的高速運轉需要使用軸承來降低摩擦並減少阻力。滾動軸承透過球或滾子來減少摩擦，滑動軸承則透過油膜隔離兩個金屬表面來減少硬摩擦，從而降低磨損和噪音。

噪音和震動：軸瓦與曲軸之間的大接觸面積可提供較高的平均壓力，油膜的存在使運轉更平順，噪音和振動更少。相比之下，滾動軸承在運轉時會產生更多的噪音和震動。

安裝與維護：滑動軸承易於安裝且不佔空間，有利於縮小引擎體積。此外，滑動軸承在軸向有較大的自由度，能夠適應曲軸受熱膨脹時的位移，減少因熱膨脹造成的損壞。

Heat dissipation and stability: Plain bearings have a large contact area, which is conducive to rapid heat dissipation and improves the stability of engine operation. In contrast, rolling bearings are susceptible to damage under high loads and harsh environments.

成本和維護：雖然滑動軸承的初始成本可能較高，但其維護成本較低，且在高溫、高衝擊的環境下使用壽命較長，減少了頻繁更換軸承的需求。

In summary, ballbearings on crankshafts engine crankshafts use plain bearings rather than rolling bearings, mainly to reduce friction, reduce noise, facilitate installation and maintenance, and improve stability and heat dissipation efficiency.