簧下质量 Unsprung mass
（重定向自Unsprung weight）
在地面车辆的悬吊系统中，簧下重量(或是簧下质量)是指悬吊的质量，车轮或车轨(如适用)，和其他直接连接于其上的零件，不包含其他由悬吊支撑的零件。(车体及其他由悬吊支撑的零件称为簧上质量)簧下重量包含众多零件，如轮轴、轮轴承、轮毂(羊角)、轮胎和传动轴的部分重量，减震桶和悬吊连杆。如果车辆刹车系统是安装于舷外(在车轮框内，例外的有Alfa Romeo 75)，这些重量也列入簧下重量的一部分。
Unsprung weight
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英语百科
Unsprung mass 簧下质量
（重定向自Unsprung weight）
In a ground vehicle with a suspension, the unsprung weight (or the unsprung mass) is the mass of the suspension, wheels or tracks (as applicable), and other components directly connected to them, rather than supported by the suspension. (The mass of the body and other components supported by the suspension is the sprung mass.) Unsprung weight includes the mass of components such as the wheel axles, wheel bearings, wheel hubs, tires, and a portion of the weight of driveshafts, springs, shock absorbers, and suspension links. If the vehicle's brakes are mounted outboard (i.e., within the wheel), their weight is also considered part of the unsprung weight.
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