DEPARTMENT OF MECHANICAL ENGINEERING

  Different Types of Gear Systems and Their Applications Gears are toothed machine elements used to transmit rotary motion and power from one shaft to another. By selecting different gear arrangements, we can change speed, torque, direction of rotation, and sometimes rotary motion into linear motion . Gear systems are widely used in automobiles, machine tools, industrial machinery, robotics, aerospace equipment and power transmission systems. 1. Spur Gear Construction A spur gear is a cylindrical gear having straight teeth parallel to the shaft axis . It normally operates between two parallel shafts. Working When the teeth of the driving gear mesh with the teeth of the driven gear, rotary motion and torque are transmitted from one shaft to another. Applications Gearboxes Machine tools Conveyors Clocks and instruments Printing machines Low- to moderate-speed drives Industrial machinery Advantages Simple construction Easy to manufacture High efficiency No axial thrust Relatively ine...

  Hybrid Engine Technology Introduction Hybrid Engine Technology is an important development in modern automobile engineering. A Hybrid Electric Vehicle (HEV) combines a conventional Internal Combustion Engine (ICE) with an electric motor and battery system. The two power sources work together to improve fuel economy, vehicle performance and reduce emissions. What is a Hybrid Vehicle? A hybrid vehicle uses two sources of power : Internal Combustion Engine (Petrol/Diesel) Electric Motor with Battery Depending on the driving condition, the vehicle can use the engine, electric motor, or both. Main Components The important components of a hybrid vehicle are: Internal Combustion Engine (ICE) – Produces mechanical power. Electric Motor – Provides additional driving power and can also work as a generator. Battery Pack – Stores electrical energy for the motor. Generator – Produces electrical energy from mechanical power. Power Control Unit/Inverter – Controls the flow of electrical e...

  Reconditioning of Public Transport Bus Engines, Spares & Components Public transport buses run for lakhs of kilometres every year, often on poor roads and under heavy loads. Their engines and major components wear out steadily, and replacing them with brand-new parts every time would be extremely costly for state transport corporations. This is where reconditioning comes in — a core practical subject in the diploma mechanical engineering curriculum and a major area of employment in RTC workshops, private garages, and automobile service industries. This blog breaks down what reconditioning means, why it matters, and how it is carried out on bus engines and their components. 1. What is Reconditioning? Reconditioning is the process of restoring a used or worn-out component to a condition as close as possible to its original specifications, using inspection, repair, machining, and replacement of worn parts — rather than discarding the whole assembly and buying new. It sits b...

  Working Principles of Combustion Engine 1. Introduction A combustion engine , commonly called an Internal Combustion Engine (IC Engine) , is a heat engine in which the combustion of fuel takes place inside the engine cylinder . The chemical energy of the fuel is converted into: Chemical Energy → Heat Energy → Pressure Energy → Mechanical Energy → Rotary Motion IC engines are widely used in automobiles, motorcycles, tractors, generators, construction equipment, ships and many industrial applications. 4 2. Basic Principle of an IC Engine The basic working principle is based on the burning of fuel inside a cylinder . When fuel burns with air, a large amount of heat is released. This produces high-pressure gases , which act on the piston. The piston moves up and down inside the cylinder. This reciprocating motion is converted into rotary motion by the: Piston → Connecting Rod → Crankshaft The crankshaft then supplies useful mechanical power to the vehicle or machine. Energy Conversio...