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SYLLABUS

UNIT-I

Mechanisms Elements of links – Classification – Rigid link, Flexible and fluid link – Types of kinematics pairs – Sliding, Turning, Rolling, Screw and sperical pairs – Lower and higher pairs, Closed adn open pairs – Constrained motion – Completely, Partially or Successufully and incompletely constrained. Mechanism and Machines Mobility of mechanisms – Grubler’s Criterion, Classificationo f Machines – Kinematic chain - Inversions of mechanism – Inversions of quadric cycle chain, Single and double slider crank chains, Mechanical advantage.

UNIT-II

Kinematics Velocity and acceleration – Motion of link in machine – Determination of velocity and acceleration – Graphical method – Application of relative velocity method. Plane motion of body Instantaneous center of rotation – Centrodes and axodes – Three centers in line theorem – Graphical determination of instantaneous center, Determination of angular velocity of points and links by instantaneous center method. Kilens construction – Coriolis acceleration – Determination of coriolis component of acceleration. analysis of mechanisms Analysis of slider crank chain for displacement velocity and acceleration of slider – Acceleration diagram for a given mechanism.

UNIT-III

Straight-line motion mechanisms Exact and approximate copied and generated types – Peaucellier – Hart – Scott russel – Grasshopper – WattTchebicheff’s and Robert mechanism – Pantographs. steering gears Conditions for correct steering – Davis steering gear, Ackeman’s steering gear. Hooke’s joint Single and double Hooke’s joint – Velocity ratio – Application – Problems.

UNIT-IV

Cams Definitions of cam and followers – Their uses – Types of followers and cams – Terminology – Types of follower motion – Uniform velocity, Simple harmonic motion and uniform acceleration and retardation. Maximum velocity and maximum acceleration during outward and return strokes in the above 3 cases. analysis of motion of followers Tangent cam with roller follower – Circular arc cam with straight, Concave and convex flanks.

UNIT-V

Higher pair Friction wheels and toothed gears – Types – Law of gearing, Condition for constant velocity ratio for transmission of motion – Velocity of sliding – Forms of teeth, Cycloidal and involutes profiles – Phenomena of interferences – Methods of interference. Condition for minimum number of teeth to avoid interference – Expressions for arc of contact and path of contact of pinion and gear and pinion and rack arrangements – Introduction to helical – Bevel and worm gearing. Gear trains Introduction – Types – Simple – Compound and reverted gear trains – Epicyclic gear trains. Methods of finding train value or velocity ratio of epicyclic gear trains. Selection of gear box – Differential gear for an automobile.