How seat belt works.


Seat belt is very essential component in any vehicle regarding our safety; it holds us at time of any accident. Prevent us to strike against steering and dashboard. 
Let us understand how it works.
Standard seat belts have a retractor mechanism.
The belt webbing is connected to retractor mechanism.
The central element in retractor is spool. The central element in the retractor is a spool, which is attached to one end of the webbing. Inside the retractor, a spring applies a rotation force, or torque, to the spool. This works to rotate the spool so it winds up any loose webbing.
When you pull the webbing out, the spool rotates counter-clockwise, which turns the attached spring in the same direction. Effectively, the rotating spool works to untwist the spring. The spring wants to return to its original shape, so it resists this twisting motion. If you release the webbing, the spring will tighten up, rotating the spool clockwise until there is no more slack in the belt.
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THE WANKEL ROTARY COMBUSTION ENGINE

                             

INTRODUCTION

->The advantage of rotary motion have far long been known and appreciated,it
includes number of patent including the patent of rotary Steam Engine by James
Watt in1769.
->Scheffel in 1952,get patent for rotary engine,utilised the principle that oval or
elliptical tower can be designed to maintain contact,while turning about find centres
and that three or more rotars can to enclose between them a continously varying
volume.
->Felia Wankel(German),got a patent for design of four phase rotary engine working
on otto cycle principle.
->Later on Dr.FROEDE made the inner rotar or bit while it rotated,and permitted the
outer body to kept stationary,such simple arrangement allowed attachment of intake,
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Active Denial System (ADS)


How would be if without hurting or killing people we would able to control over un-civilized mob or anti-social elements .
It is possible The Active Denial System (ADS) a non-lethal, directed-energy weapon developed by the U.S. military to control un-wanted rage of mob.
The   weapon is also called the heat ray, since it works by heating the surface of targets, such as the skin of targeted human subjects.
 The ADS was deployed in 2010 with the United States military in the Afghanistan war
The ADS is currently only a vehicle-mounted weapon, though U.S. Marines and police are both working on portable versions
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Kinetic Energy Recovery System: Makes F-1 car so fast.

what is KERS ?


  • The kers stand for Kinetic Energy Recovery System
  • it is an automotive system for recovering a moving vehicles kinetic energy under braking or we can say that it recovers the kinetic energy present in waste i.e. heat generated when we apply brake.

Note : It is used by formula one & racing car company & in future it will be used by commercial car company.

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Gears

GEARS
Gear is a mechanical instrument having toothed section generally used for transferring torque, force from one part of machine to another part of machine.

BACKLASH
It is a minimum distance between the two mating teeth in motion when the gear is driving the pinion.
       Sometime it is also called as LASH or PLAY.
"In a pair of gears backlash is the amount of clearance between mated gear teeth".
Theoretically, the backlash should be zero, but in actual practice some backlash must be allowed to prevent JAMMING.
The other reason for backlash is allowing for lubrication, manufacturing errors, deflection under load and expansion.

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Re-Grooving of tyre


 

Basic behind tyre re-grooving


The basic component are-:

  1. Tyre Inspection
  2. Tyre Buffering
  3. Tyre Builder
  4. Pressure chamber
  5. Mono rail
  6. Envelope spider


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Differential


Introduction
A differential is a device, usually, but not necessarily, employing gears, which is connected to the outside world by three shafts, through which it transmits torque and rotation. The gears or other components make the three shafts rotate in such a way that a=pb+qc, where a,  b, and c are the angular velocities of the three shafts, and p and q are constants. Often, but not always, p and q are equal, so a is proportional to the sum (or average) of  b and c.
In automobiles and other wheeled vehicles, a differential allows the driving road wheels to rotate at different speeds. This is necessary when the vehicle turns, making the wheel that is travelling around the outside of the turning curve roll farther and faster than the other. The engine is connected to the shaft rotating at angular velocity a. The driving wheels are connected to the other two shafts, and p and q are equal. If the engine is running at a constant speed, the rotational speed of each driving wheel can vary, but the sum (or average) of the two wheels' speeds cannot change. An increase in the speed of one wheel must be balanced by an equal decrease in the speed of the other.
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