Diameter - To Push The Joint Float Ring Hybrid Bearing Design And Test Device

With Ihe development of science and technology, bearing with high precision, low power consuming and high stability is needed to act as the supporter of die machine rotor-support system in industry, and ft is developing towards the trend of high velocity and heavy load. Radial-thrust floating-ring hybrid bearing has the advantages of both hydrostatic bearing and hydrodynamic bearing. As the radial-thrust floating-ring is inserted between shaft and beating surface , the oil film transforms from one layer to two layers , and so it is demanded that the bearing is a new type of one with extraordinary stability.Radial-thrust floating-ring hybrid bearing can sustain not only the radial load but also the thrust load. All the radial part and the thrust part of the bearing take structure of deep and shallow cavity. The deep cavity can make the beating has good hydrostatic bearing capacity and low friction moment when starting, while providing sufficient lubricating oil when run in high speed. The ladder structure between the deep and shallow cavities and sealing surface can produce huge bearing capacity while the bearing is running . The bearing adopt a new type restrictor - the flat capillary restrictor is laid in the deep recesses instead of outerspace, which refrain the lubricating oil from blocking effectively. Operating the bearing, the inner oil film will be formed between the shaft and the floating-ring, that is the master oil film, and outer oil film formed between the floating-ring and the bearing surface, that is a kind of useful appendix elastic support.In this paper, based on the Reynolds Equation of the bearing in which the lubricant inertia hem is considered, the model Radial-thrust floating-ring hybrid bearing was designed and manufactured through the Finite Element Method calculation . Furthermore , the oil providing system and load devices also produced . According to dynamic-state vibrating method, static and dynamic characters are deeply researched with a lot of experiments. First, the mathematic model of Radial-thrust floating-ring hybrid bearing is made and the static and dynamic characteristics coefficients are calculated by the Finite Element Method. Second, the turbulence phenomenon on the radial part and thrust part of radial-thrust floating-ring hybrid bearing with the structure of deep and shallow cavity crevice throttle is discussed .The turbulence Reynolds Equation is derived by adding the turbulent factors in the non-normalReynolds Equation . The pressure distribution of the bearing are worked out by using the Finite Element Method. Third, the dynamic characteristics including 16 dynamic stirrhess coefficient and dynamic damper coefficient of the radial part and 4 of the thrust part are researched through experiments . These characteristic are acquired through the matrix calculation by making use of the data come from the sensors. Finally, in order to proceed the experimental researching of the radial-thrust floating-ring hybrid bearing, the experiment plan and the equipment are researched and some of the key technology which appeared in the production of the bearing are resolved.Experiments on the dynamic characteristics are basis of researching the stability such as the oil whirl and the oil whip. The difficulty of the experiment is how to exert the load, and that is resolved by designing the load devices reasonably.All above the theoretic and experimental equipment researching formed the basis of practical application for Radial-thrust floating-ring hybrid bearing.This paper is part of the researching project named the static and dynamic characteristics researching of the radial-thrust floating-ring hybrid bearing which is supported by the Natural Science and Technology Research Foundation of the Nation.