目前弹簧连杆结构主要有两种：拉伸式弹簧连杆、压缩式弹簧连杆。
Recently there are two types of spring-linkages: the tension structure and the compressed structure.
以上连杆、弹簧、皮球均放置在金属管内，套管固定在大梁两侧。
The above connecting bar springs rubber balls are all placed in metal tube casing pipes are fixed to supporting frame's two sides.
四连杆铰链气弹簧助力式开启机构是目前高档汽车特别是轿车上经常采用的一种结构。
Air spring booster type four bar linkage opening mechanism is a currently used common structure on high class automobile, especially on car.
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