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4
I. STRUCTURAL AND KINEMATIC ANALYSIS
OF LEVER MECHANISMS
Terminology study of component parts of mechanisms
Classification of mechanisms and machines. Links. Kinematic pairs.
Structural groups (Assur’s groups).
Methodical materials:
− text;
− models of mechanisms;
− pictures with kinematic pairs, mechanisms, schemes of
mechanisms;
− tasks on the theme.
INTRODUCTION
1. Mechanics of Machines and their Basic Sections
Mechanisms are widely used in all branches of modern technology. The
same types of mechanisms having the same computation and design methods
are used in machines of various branches. The Theory of Machines and
Mechanisms (TMM) develops general kinematic and dynamic methods of
design applied to mechanisms of various branches of engineering. The
special disciplines studying the theory and methods of mechanisms and
machines’ design, used in separate branches of engineering, widely use
general methods developed in ТММ, therefore ТММ is a general-
engineering discipline.
Base for ТММ is physics, mathematics and theoretical mechanics. The
TMM jointly with sciences "Strength of Materials and Theory of Elasticity",
"Machine Elements" and "Production Engineering" is theoretical basis for
current engineering industry.
The Theory of Machines and Mechanisms considers the scientific basis
of machine design and their investigation methods. It is a science studying
machines both as a complex unit and as separate links having the purpose of
their analysis and providing people with knowledge for creation of new ones.
The purpose of creating of machines is to increase the productivity and
to make worker’s manual labour easier or to extend his or hers physical and
intellectual opportunities. The term "machine" covers a great number and
variety of objects used by a man for labour and physiological functions.
The following definition is common:
The machine is a device intended for transformation of energy,
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