| This dissertation stems from the project "Study on high efficient multi-flow transmission system" which is sub-project of the Natural Science Foundation Key Project "Fundamental study on energy saving of mechanical/fluid transmission and new transmission methods", which mainly analyzes the energy saving issue of mechanical transmission system from the point of view of design theory and method. Multi-flow transmission systems have been widely applied to large mechanical equipment such as creeper truck, helicopter, cement grinder, hoist, wind electricity generator, construction machinery and metallurgy industry. Since these transmission systems are characterized by multi-input and multi-output, the structures adopted are power distributing and power combining, which complicate the internal power flowing processes. The systems are often accompanied by circulating power generation and input power being transferred to load power, which increases energy consumption. Meanwhile, to coordinate the relationship among various input power so that the power can be brought into full play to save energy, an accurate and efficient analysis and design on the system is needed. It is essential to explore a simple, accurate and generally suitable design theory and method for complicated multi-flow transmission system, which will provide technology support for high efficiency, energy saving and top quality multi-flow transmission system design. Therefore, the research has important theoretical and practical significance as well as engineering application value.Double speed hoist reducer developed by Zollern Co. Ltd. of Germany in the middle 90's of 20th century is a new generation of energy saving and environment protecting hoist product. It is a compound planetary transmission with power distributing and combining, so it has the properties of both differential and closed planetary gearing. It is a typical multi-flow transmission system with large transmission ratio, great load carrying capacity, high efficiency, low noise, long life, light weight, compact construction, possible super-small volume and changeable speed. It deserves wide applications being a new generation of energy saving and environment protecting product, which can be used as alternatives of common reducer. Since the price of such product is high, and its theory and properties are not understood quite well in engineering machinery industry at home, it is few used and there is no manufacturing factory to produce this kind of reducer at home. Double speed hoist reducer is mainly used in high altitude lift operation, so good dynamicproperties is demanded for hoist reducer. It is indispensable and with practical value to study the dynamic characters of double speed reducer in theory and experiment. This dissertation systematically elaborates the transmission features, dynamic modeling and dynamic properties of double speed hoist reducer.Double speed hoist reducer is a multi-flow transmission device composed of one differential gearing and one closed gearing. From the point of view of motion, the gearing theory, design and calculation method of double speed hoist reducer are analyzed. An example of analyzing and calculation is given to illustrate the performances and features of this reducer.With the theory and method of power bonding figure, a bonding figure model with coupling vibration is established for the first time at home for double speed hoist reducer transmission system and planetary reducer at certain working condition and considering elastic supporting. The state equation of the system is developed and dynamic simulation analysis is carried out. The internal changing law and relationship of the system at several typical working conditions are studied. Using controlling theory and method, the stability of the system is analyzed. The effect on system dynamic property is revealed via analysis of system parametric variation.The key part of double speed hoist reducer named single stage planetary reducer is analyzed in detae. Meshing frequency va...
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