**Dr. Murat Gökçek PhD,**

 Faculty of Engineering Department of Mechanical Engineering Niğde University, Niğde, Turkey

X Preface

the result of the cooperation of many people. I would like to thank the Publishing Process Manager Ms. Leda Bace for her support during the publishing process, as well

> **Dr. Murat Gökçek PhD,** Faculty of Engineering

Niğde University, Niğde,

Turkey

Department of Mechanical Engineering

as Mr. Metin Ertufan for inviting me to be the editor of this book.

**Part 1** 

**Power Transmission Systems** 

**Part 1** 

**Power Transmission Systems** 

**1** 

**Mechanical Transmissions Parameter Modelling** 

In mechanical technique, transmission means appliance which is used as intermediary mechanism between driving machine (e.g. of engine) and working (consumed) machine. The role of transmission is transmitting of mechanical energy from main shaft of driving machine to main shaft of working machine. The selection of transmission is limited by the price of complete appliance, by working environment, by dimensions of the appliance, technical regulations, etc. In mechanical engineering, so as in technique generally, mechanical transmissions are broadly used. Mechanical transmissions are mechanisms which are used for mechanical energy transmitting with the change of angle speed and appropriate change of forces and rotary torques. According to the type of transmitting, mechanical transmissions could be divided into: transmissions gear (sprocket pair), belt transmissions (belt pulleys and belt), friction transmissions (friction wheels) and chain

In this chapter, the results of the research of three-dimensional (3D) geometric parameter modelling of the two frequently used types of mechanical transmissions, transmissions gear (different types of standard catalogue gears: spur gears, bevel gears and worms) and belt transmissions (belt pulley with cylindrical external surface, or more exactly, with pulley rim) using CATIA V5 software system (modules: *Sketcher*, *Part Design*, *Generative Shape* 

Modelling by computers are based on geometric and perspective transformation which is

It is advisable to make the parameterisation of mechanical transmissions for the purpose of automatization of its designing. Parameter modelling application makes possible the control of created geometry of 3D model through parameters integrated in some relations (formulas, parameter laws, tables and so on). All dimensions, or more precisely, geometric changeable parameter of gear and belt pulley, can be expressed through few characteristic fixed parameters (*m*, *z*, *z*1, *z*2 and *N* for the selected gear; *d*, *Bk*, *dv* and *s* for the selected belt pulley). Geometry of 3D mechanical transmission model is changed by changes of these parameters values. Designer could generate more designing solutions by mechanical

Because AutoCAD does not support parameter modelling, and command system, that it has, does not make possible simple realization of changes on finished model, parameter

transmissions (chain pulleys and chain). (Repcic & Muminovic, 2007)

*Design*, *Wireframe and Surface Design* and *Assembly Design*), is shown.

not more detail examined in the chapter because of their large scope.

transmission parameterisation.

**1. Introduction** 

Isad Saric, Nedzad Repcic and Adil Muminovic *University of Sarajevo, Faculty of Mechanical Engineering,* 

*Department of Mechanical Design,* 

*Bosnia and Herzegovina* 
