Entry

Any Idea about Gears?

Dec 19th, 2007 00:56
Ansheel, Tania Glover, Garima Modi, http://www.info4india.com/ http://www.namaskarindiatravels.com/ http://www.rajasthantravelsguide.com/ http://www.jaipurtravels.com/

Gears are a fundamental part of just about any mechanical object -- if 
it has a motor, engine or spring, it probably has gears!
Gears are everywhere and are used for a number of different 
applications ranging from your washing machine to multi-million dollar 
industrial machinery.  Our cars would not be able to get us from place 
to place without the technology of gears.  Gears are so important 
because they provide something called gear reduction.  Gear reduction 
allows enough torque to be applied in instances where it’s needed 
despite sufficient power.
One common automotive application is the ring and pinion gear 
differential within rear-wheel-drive cars and trucks.  Within the 
world of gears, the ring and pinion gears are a type of bevel gear.  A 
bevel gear is used because it reassigns the power from the driveshaft 
90 degrees, which is necessary to transfer power to the axle shafts 
that are connected to the rear wheels.  A special type of bevel gear 
used for this application has hypoid teeth instead of straight teeth.  
Hypoid teeth are curved and allow for a gradual “meshing” of the gears 
that makes for much smoother and quieter operation than bevel gears 
with straight teeth.  Without hypoid gears, our cars would be very 
loud and “jerky” in regard to the transmission of power. 
The use of rack & pinion gear technology has helped to greatly improve 
the steering performance in our cars and trucks.  Before rack & pinion 
steering systems, “re-circulating ball” was the most commonly used 
steering technology.  Re-circulating ball steering uses a more complex 
system that involves a worm gear and ball bearings to help turn the 
wheels.  The simpler, yet better rack & pinion steering system 
improves control and is more responsive throughout the entire steering 
range, especially at center.  This system works by converting 
rotational motion originating from the steering wheel into the linear 
motion that eventually turns the wheels.  Sometimes simpler is better.
The list of gear applications for automobiles goes on and on, 
including things ranging from your car’s transmission, to its timing 
gears within the engine.  Without gears, travel wouldn’t be nearly the 
same as it is today.
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