Orgãos de Máquinas

Recommended Prerequisites

Strength of Materials I e II, Applied Mechanics, Science and Engineering of Materials, Mechanical Behaviour of Materials, Introduction to Mechanical Design

Teaching Methods

Classes take place in theoretical and theoretical-practical regime. Theoretical classes expose the fundamental concepts in the form of conferences using transparencies and multimedia media. Theoretical-practical classes apply the concepts given in the theoretical classes through the discussion of some problems solved, previously made available to students, intending that students have an active participation..

Learning Outcomes

Provide students with a broad knowledge of the ability of calculating mechanical components in projects involving power or energy transmissions in continuous and transient regimes. Calculation methods for elements of the main mechanical transmissions are presented. At the end of the course, the student will be able to: select the type of transmission best suited to the particular service conditions of a particular case; perform simplified sizing of cylindrical wheel gear and worm/wheel elements based on analytical methods; make a complete selection of the several types of flexible mechanical transmission elements based on manufacters catalogs.

Work Placement(s)

No

Syllabus

Mechanical transmissions: General characteristics and selection of mechanical transmissions - criteria for selection of transmissions. Comparative analysis of the main types of transmissions.

Design of belt transmissions. Geometry. Construction details and assembly. Types of failure. Dynamic study.

Design of roller chain transmissions. Nomenclature and geometric relationships. Kinematic analysis. Assembly and maintenance. Analysis of forces.

Transmissions by gears. Cylindrical gears: primitive surfaces and surfaces of teeth, nomenclature and geometrical relationships, the study of gear, slip, interference, correction of teeth. Worm/wheel gear : primitive surfaces, vocabulary, symbols and geometric relationships. Dynamic analysis. Mechanical efficiency.

Head Lecturer(s)

Maria de Fátima da Costa Paulino

Assessment Methods

Assessment
Exam: 100.0%

Bibliography

- C.M. Branco, J.A.M. Ferreira, J.D.M. Costa e A. Ribeiro “Projecto de Orgãos de Máquinas”, Ed. Fundação C. Gulbenkian, 2008.

- R. C. Juvinal, K. M. Marshek, “Fundamentals of Machine Component Design”, Ed. John Wiley & Sons, 1991.

- J. R. Shigley, C. R. Mischke, “Mechanical Engineering Design”, McGraw-Hill International Edition, 1989.

- R. L. Norton, “Machine Design – an Integrated Approach”, Ed. Prentice Hall Inc., 1996.

- G. Henriot, Traité Théorique et Pratique des Engrenages, Vol. 1 “Théorie et Technologie”, 6ª ed, 1979.

- Manual de Projecto de Correias Trapezoidais nº E2/20070, Gates, 1999.

- Manual de Projecto de Correias Dentadas nº E2/20099, Gates, 1999.

- Catálogo de Correntes Refª REN8/ENG/17/98/5K/2, 1998, Renold Power Transmission Limited, 1998.

- International Standard 6336/2006, Calculation of Load Capacity of Spur and Helical Gears.

- BS721 – British Standard Specification for Worm Gearing, part 2, Metric Units, Britich Standard Institution, 1993.