DISEÑO DE DETALLE, INSTRUMENTACIÓN Y EXPERIMENTACIÓN DE SISTEMA CHUMACERA HÍBRIDA

Abstract

The functioning of hybrid bearings is characterized by the fact that the supporting pressure of the bearing is generated by external lubrication. Using hybrid bearings have the advantage of combined characteristics of hydrodynamic and hydrostatic bearings. The special advantages of hydrostatic bearings are lack of wear, quiet running, wide useable speed range as well as high stiffness and damping capacity. These properties are also the reason for the special importance of hydrostatic bearing units in different fields of application. And if the lubrication system fails, the hybrid bearing can still functioning as hydrodynamic bearing, reducing the possibility that the system could be damaged. The bases of calculation described in the chapter two apply to bearings with different number of recesses and different width/diameter ratios for identical recess geometry. The oil is fed to each bearing recess by means of a common pump with constant pump pressure (system pen = constant) and via preceding linear flow restrictors or capillaries. The calculation procedures here listed enable the user to calculate and assess a given bearing design as well as to design a bearing as a function of some optional parameters. Furthermore, this thesis contains the design of the required lubrication system including the calculation of the restrictor data. Having considered the design parameters, security and performance (based on international norms for the bearings design), we proceeded to build the prototype components. It was also considered the assembly process, as well as security measures for the proper functioning of the prototype hybrid bearing. These parameters are explained in detail in the chapter four. Finally we analyzed in the Vibrations and Rotordynamics Laboratory of the ESIME Zacatenco, Mexico City, the experimental performance of the prototype, simulating real conditions of start up, stop or the performance of rotating machinery tools such as the ones the industry uses. The goal is to find solutions to problems that are found every day in the industry.