在15世纪早期，人们发明了螺旋弹簧或均力圆锥轮，尽管它的主弹簧的张力不断变化，但仍能对计时装置的齿轮保持恒定的力。

In the early 1400s came the invention of the coiled spring or fusee which maintained constant force to the gear wheels of the timekeeper despite the changing tension of its mainspring.

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简要介绍了板簧变形运动学分析在设计中的应用，推演了理想多片钢板弹簧跳动时主片中心位置的详细计算方法；

This paper introduces the application of leaf spring kinematics chiefly, and derives the computing method of main leaf center when ideal multi-sheets leaf spring bounces.

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主阀主要由阀座、主阀盘、活塞、弹簧等零件组成。

Mainly by the main valve seat, the main valve plate, piston, springs and other parts.

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