Tech@Edu

Body "Body is nothing but the 'face structure' of the automobile. Body is only aspect to provide ergonomics feature in any automobile." It consist of doors, windows, side panels, fenders, front & rear bumpers, grille, pillar etc. A body sometimes referred to as "coachwork". The body is that part where passengers have occupies their seats or the luggage and other placed cargo to be carried.  Body is built on the chassis to complete the vehicle. Chassis & body makes the complete automobile vehicle. For small & light car, body & chassis are made as a single unit but in large vehicles both are made as a single unit. Generally body surface is made from metal or fiber. The body is usually made from a large number of steel pressings which are welded together.  The body is bolted to the chassis at numerous points. The rubber or felt-strips being interposed to damp-down (reduce) the vibrations and noise.  Main purpose of the body is to provide safety

Coupling "A coupling is a device used to connect two shafts together at their ends for the purpose of transmitting power." The primary purpose of couplings is to join two pieces of rotating equipment while permitting some degree of misalignment or end movement or both.  Shafts are usually available up to 7 metres length due to inconvenience in transport. In order to  have a greater length, it becomes necessary to join two or more pieces of the shaft by means of a  coupling. Purpose of Coupling Shaft couplings are used in machinery for several purposes. 1. To provide for the connection of  shafts of units that are manufactured  separately such as a motor and generator  and to provide for disconnection for repairs or alternations. 2. To provide for misalignment of the  shafts or to introduce mechanical  flexibility. 3. To reduce the transmission of shock  loads from one shaft to another. 4. To introduce protection against  overloads. 5. It should have no projecting parts. Requ

Shaft Key "A key is a piece of mild steel inserted between the shaft and hub or boss of the pulley to connect these together in order to prevent relative motion between them." It is always inserted parallel to the axis of the shaft. Keys are used as temporary fastenings and are subjected to considerable crushing and shearing stresses. A key way is a slot or recess in a shaft and hub of the pulley to accommodate a key. Types of Key 1. Sunk keys (a) Rectangular Key (b) Square Key (c) Parallel Sunk Key (d) Gib Head Key (e) Feather Key (f) Woodruff Key 2. Saddle keys 3. Tangent keys 4. Round keys 5. Splines 6. Kennedy Key 1. Sunk Key The sunk keys are provided half in the key way of the shaft and half in the key way of the hub or boss of the pulley. The sunk keys are of the following types- (a) Rectangular Key The usual proportions of this key are :  Width of key  w = d / 4 T Thickness of key t = 2w / 3 = d / 6  where d = Diameter of the shaft or diameter of the hole in the h

Fuel Atomizer or Injector “Fuel injector is an electronically controlled mechanical device that is responsible for spraying (injecting) the right amount of fuel into the engine so that a suitable air/fuel mixture is created for optimal combustion.”  Types of Fuel Injector 1. Single-point or throttle body injection 2. Port or multi-point fuel injection 3. Sequential fuel injection 4. Direct injection 1. Single-point or throttle body injection The throttle body injection (TBI) system is one of the first types of injection systems ever used by vehicles. Before TBI, vehicles used a carburetor. TBIs work in a manner very similar to a carburetor. The fuel is still sucked into the cylinders because of the suction created by the engine. However, TBIs are controlled by an electronic computer within the vehicle. The computer provides more accuracy by determining the amount of fuel that should be deposited into the engine. This accuracy ensures less fuel is wasted and allows the vehicle to run mo