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Beam prob 1

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RATCHET & PAWL MECHANISM

INTRODUCTION ·       This type of mechanism is used in producing intermittent rotary motion from an oscillating or reciprocating motion member. ·       The ratchet and pawl mechanism consists of a ratchet wheel and a pawl, as shown in figure. ·       The ratchet consists of a round gear or linear rack with teeth. ·       A pawl is a spring loaded member that engages the teeth of the ratchet the teeth of ratchet is uniform.  Theory of operation A ratchet consists of a round  gear   or linear  rack  with teeth. A pawl is a  spring-loaded member that engages the teeth of the ratchet. The teeth are uniform, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge. When the teeth are moving in the unrestricted (i.e., forward) direction , the pawl easily slides up and over the gently sloped edges...
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Battery ignition system

Most of SI engine used battery ignition system. In this system a 6 volt or 12 volt battery used to produce spark. Passenger cars, light truck, motorcycles and large stationary engines are fitted with this system. Main Parts of battery ignition system:     Battery A battery is used to provide energy for ignition. It is work as storage of energy and charged by dynamo, which is driven by engine. It converts chemical energy to electric energy.   Ignition switch It is used to turn on and off the ignition system. Battery is connected to the primary winding of ignition coil by ignition switch and ballast resistor. Ballast resistor It is connected in series with primary winding to regulate current in primary winding. It is used to prevent injury due to overheating of ignition coil. It controls the current passes through primary winding. It is made by iron. Iron has property of increase electrical resistance rapidly by incre...
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DC MOTOR

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