轴承损失功率Pm1、密封损失Pm2和圆盘摩擦损失功率Pm3之和称为机械损失Pm，其大小用机械效率ηm来表示。
效率包括所有机械密封中的机械损失。
Efficiencies include all mechanical losses including mechanical seals.
研究结果表明：磨擦损失功率约占整机机械损失功率的60％。
It is shown that the friction loss is about 60 percent of the total loss.
在缺少实验设备的情况下，利用计算公式可以估算柴油机各部分的机械损失。
Under the condition of lacking testing equipments, mechanical losses in each part of diesel engines can be estimated by calculation equations.
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