29-05-2012, 02:30 PM
AUTOMOBILE ENGINEERING
AUTOMOBILE ENGINEERING.ppt (Size: 5.64 MB / Downloads: 280)
CHESSIS
Chassis Frame
Rubber cushions used in body or frame construction isolate noise and vibration from traveling to the passenger compartment.
Unit-body construction.
Welded metal sections create a platform that combines the body with the frame using unit-body construction.
CLUTCH
An apparatus that disconnects the engine from the transmission in order for the car to change gears and then enables the gears to resume contact and turn together at a new speed.
It connects and disconnects the power generated by the Engine form the rest of the transmission.
It can be automatic or manually operated.
This consists of a Disc and Pressure Plate or Plates and also available in a fluid model which is called “Torque Converter”.
Any sort of defect in driving would first reflect on this part.
Efficiency in driving the vehicle depends on the efficiency of the Clutch and vise versa.
Function of a GearBox…
In practice, the main use of a Gearbox is to act as a reduction gear. These can be variable or non-variable, depending on the application.
This not only decreases wear on the motor, but also allows greater acceleration - in fact the larger the reduction ratio, the larger the acceleration.
In other words, if when the motor is turning 2500 rpm the output shaft is turning 500, the gearbox is reducing the number of revolutions from input to output.
Torque converters, hydraulics, electrical power and hybrid configurations may also be used for the same purpose.
Multiplies engine torque via gear reduction and/or torque conversion. A typical manual transmission has four or five speeds, with the final or highest gear being either a direct 1:1 drive ratio or an "overdrive" ratio (less than 1:1).
This device transmits the power to the propeller shaft changing the RPM.
It can be automatic or Manually operated.
In a car it is operated with the help of Gear lever which helps the driver the gears according to his requirement.
In a manually operated Gear box it is mandatory to engage the clutch and then change the gear.
Constant Mesh and Syncro Mesh are the types of the gear boxes.
Epicyclic Gear Box
Automatic gearboxes typically use one or more compound planetary gearsets instead of chaining regular gearsets together.
They look just like a regular planetary gearset from the outside, but inside there are two sun gears and two sets of intermeshing planet gears.
There is still only one ring gear though.