Creatively , this paper advance involute as the tooth form that has been used widely in the engineering , and we also bring forward a design idea that tooth can be distributed continuously on spherical surface . based on those ideas , we invent the spherical gear of ring involute tooth . it is proved that this mechanism overcome the two big objections of traditional gear by solid model , and so a great breakthrough is achieved in the gear drive field . 2 本文创造性地提出了采用工程上广泛应用的渐开线作为齿廓曲线，并将轮齿沿纬度方向在球面上呈连续分布的设计思想，在此基础上发明了渐开线环形齿球齿轮机构，实物模型证明，该机构从根本上克服了传统离散齿球齿轮存在的传动原理误差和加工困难两大障碍，在齿轮传动领域取得了重大突破。
When modeling and simulating the whole system , the writer divides the periodical change of valve into many segments . with the method of power bond graph , the writer deduces the state equations of the system , which converting the substantial model into mathematical model . in the simulation , the writer uses matlab as the programming language 在对整套系统进行建模和仿真时，笔者将控制阀的周期性变化过程进行分段考虑，应用功率键合图法，推导出阀控气动振动系统的状态方程，实现了实物模型向数学模型的转化。
