Theory of Machines - MADE EASY Study Material for GATE, ESE and SES Exams

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Classification of Kinematic Pairs and Its Applications

Classification of Kinematic Pairs According to nature of contact Lower pair: : A pair of links having surface or area

A flywheel wheel is used in machines to serve as a four reservoir, which stores energy during the period when

Sensitiveness of Governor A governor is said to be sensitive when it readily responds to a small change in speed.

Types of Centrifugal Governor Pendulum type — Watt governor (simplest) Loaded type Porter Governor If the sleeve of a Watt

The function of a governor is to maintain the speed of an engine within specified limits whenever there is a

The Ackermann steering gear has only turning pairs. Fig. (a) shows the steering gear for straight drive. The turning pairs

Davis steering gear is shown in Fig. This type of gear has only sliding pairs. Two arms AG and BH

The Ratchet and Pawl Mechanism A Ratchet and Pawl mechanism. The arm pivots about the center of the toothed ratchet

The Geneva wheel mechanism is shown in Fig. The input crank is typically a motor driven at a constant speed.

Intermittent motion is a sequence of motions and dwells. A dwell is a period in which the output link remains

Straight Line Mechanisms A mechanism built in such a manner that a particular point in it is constrained to trace

PANTOGRAPH A pantograph is a four-bar linkage used to produce paths exactly similar to the ones traced out by a

The Oldham’s coupling shown in figure is used to connect two parallel shafts, the distance between whose axes is small

Second Inversion (Scotch Yoke) If any of the slide-blocks of the first inversion is fixed, the second inversion of the

First Inversion (Elliptical Trammel) It is a device to draw an ellipse. Fig. shows an elliptical trammel in which two

A kinematic chain consisting of two turning pairs and two sliding pairs is called double slider-crank chain as shown in

Planar Mechanism Taking a different link as the fixed link, the slider-crank mechanism shown in Fig. (a) can be inverted

When one of the turning pairs of a four-bar chain is replaced by a sliding pair, it becomes a single

Simple Mechanism All the mechanisms having 4-links are simple mechanisms and the mechanisms having more than 4 links are compound