Evaluation of the dynamic loading in rolling ball bearings of angular contact

• Grant number: 11/09738-7
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: December 01, 2011
• End date: November 30, 2012
• Field of knowledge: Engineering - Mechanical Engineering - Mechanical Engineering Design
• Principal Investigator: Katia Lucchesi Cavalca Dedini
• Grantee: Gustavo Zarpelon Radaelli
• Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil

Abstract

The Brazilian automotive industry plays an important role on the national economy, both on the tax revenues and on the generation of direct and indirect jobs. A major challenge for the research and development engineer on this sector is the specific knowledge related to the critic components of a complex system, as the automobiles in general. The bearings have an expressive role among the components of an automotive system, having the support of a rotating element as its major function. Due to their work on the interface between fixed and rotative elements, the bearings are the origin of a great percentage of the possible faults on a system. Among these, the rolling bearings of angular contact are one of the most utilized, mainly by the automotive industry. In spite of the great field of applications, these bearings are usually subject to damage by superficial wear, what makes very important the detailed study of the efforts and velocities on the spheres and, hence, the external and internal tracks. The description of the efforts and velocities on the spheres is a considerable challenge, once the spheres are subject to an elastohidrodynamic lubrification, that fully depends on the efforts and velocities of the spheres to be modeled, generating an iterative process. The main goal of this work is to analyze the rolling bearings of angular contact, with theoretical base on the classical literature to, then, begin the equationing of the balance of forces in the spheres, with by the way, results on the contact forces associated to the lubrication condition. As for that, a computational program will be developed to numerically simulate the cinematic and dynamic analysis and their results verified with the literature.(AU)