In view of the importance of weight saving for cars, chassis and body play a key role. The following paper details the realisation of an aluminium rear axle for the BMW 5-series car and a proposal helping towards optimising the concept for a new type of aluminium space frame developed by Volvo. The start of production of the BMW 5-series aluminium rear axle (see figure 1) was in August, 1995. It is based on a tube which is manipulated by an interior high pressure (known as hydroforming). The axle was initially developed in steel by BMW and a supplier of steel axles and was in the process of being completed before the change to aluminium was made.
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机译：鉴于减轻汽车重量的重要性，底盘和车身起着关键作用。以下文件详细介绍了BMW 5系汽车的铝制后桥的实现以及一项建议，该提案有助于优化沃尔沃开发的新型铝制空间框架的概念。 BMW 5系铝制后桥（见图1）于1995年8月开始生产。它是基于由内部高压（称为液压成形）操纵的管子制成的。该车轴最初是由宝马和钢车轴的供应商用钢开发的，并且在改用铝之前已经完成。
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