Thursday 10 December 2015
Reason for failures of paints?
1. Not proper cleaning of body before painting
2. Not covering dents or spots
3. Not using of proper good quality paint
4. Not applied the pretreatment with zinc phosphate
Requirements of Good Painting?
2. It should protect the hidden parts also from the corrosion.
3. It should have esthetic appearance.
4. It should be smooth finish for stream lining.
5. It must reduce the aerodynamic drag.
Automotive Painting
The corrosive nature of a metal used in a motor body
construction, necessitate the application of an anti corrosion coating. For this
reason the painting should be done.
Function of Painting:
1. It reduces the corrosion and protect the vehicle
body.
2. It is used for cleanliness.
3. It is used for esthetic appearance.
4. It is used to reduce the friction due to the
aerodynamic drag and allow the vehicle in stream
lining.
5. It is used for identification purpose.
Tuesday 1 December 2015
Different methods to door lock or unlock mechanisms?
1. With a key
2. By pressing the unlock button inside the car
3. By using the combination lock on the outside of the door
4. By pulling up the knob on the inside of the door.
5. With a keyless – entry remote control.
6. By a signal from a control center.
Torsion Bar in suspension system?
Torsion Bar
Torsion bar suspension is used in independent suspension system. It is a
rod acting in torsion and taking shear stresses only. It is made up of heat
treated alloy spring steel. This bar stores amount of energy nearly as same as
coil spring.
The bar is fixed at one end to the fr4ame, while the other end is fixed to
the end of the wheel arm and supported in the bearing. The other end of the
wheel arm connected to the wheel hub. When the wheel strikes a bump, it
starts vibrating up and down, thus exerting torque on the torsion bar which
acts as a spring.
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