二 平面四杆机构的基本形式——铰链四杆机构 2 双曲柄机构(Double-crank linkage) 在铰链四杆机构中，若两个连架杆都是曲柄，则称为 双曲柄机构。
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The necessary condition for the existence of double crank of five - bar linkage with two degree of freedoms is derived on the basis of assembling conditions.
根据装配条件推导了二自由度五杆机构的双曲柄存在的必要条件。
In order to realize the mechanization of snow removal on roads, the utility model USES a double-crank type parallelogram linkage as a working mechanism.
为了实现道路除雪的机械化，本实用新型采用双曲柄型平行四杆机构作为工作机构。
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