因此主封油面是处于油压下工作。
Accordingly, under oil pressure, the main oil seal surface can work.
本实用新型的要点是：在主封油面的另一侧还有一个封油唇口。
The utility model has a main point that the other side of the main oil seal surface is also provided with an oil seal lip.
本实用新型的要点是：在主封油面的另一侧还有一个封油唇口。
The utility model has a main point that the other side of the main oil seal surface is also provided with an oil seal lip.
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