What is the principles behind the operation of the gear system of an automobile?

Question

I mean how the gear system is connented tothe engine,how it increases the speed th car and also a cross section the gear system.

Answer 1

The gear system works on the principle of ratios and is very similar to the that of an ordinary pedal bike. If the engine spins at a certain speed and is connected to a lower, i.e. larger gear, then the actual speed the wheels turn is determined by the ratio between the speed the engine turns and the size of the gear, in this case the wheels will turn slower than the engine. The smaller the gear is, the faster the wheels will turn at a given engine speed.

Hope to have cleared that up for you.

Answer 2

The primary gear system an automobile is in the transmission which is usually bolted to the back of the engine. No one engine speed is adequate to meet the needs of everyday driving. Since internal combustion auto engines, especially gasoline ones, have low torque and horsepower at low engine speed, a method of "multiplying" the torque must be used. The transmission, in concert with the differential gear ratio and tire size, allows the vehicle to start moving. Next it permits the driver to select the proper engine speed to maximize performance, economy or towing ability. Transmissions perform this magic by using between 2 and 8 separate gear ratios.

A variant on this method of gearing has been the recently resurrected CVT - the continuously variable transmission. It has the theoretical ability to select an infinite number of gear ratios within its set highest and lowest ratios.

Incidentally although no one will probably tell you this, the transmission gears do not actually "shift" in and out of contact with each other. All the gears are already locked in place with each other. Gear ratios are changed by locking and unlocking each gear from the main shaft(s) which run through the transmission.

Answer 3

An internal combustion engine produces its power over a limited range of speed RPM (Revolutions Per Minute). In order to make the car more usable the gears convert this rpm into road speed.
A car with a single gear would have to have an engine that could produce usable power from very low revs to very high. Not practical. A car with 5 gears means that the engine can work in a much more efficient way.
There are ways around using multi speed gearboxes, fluid transmissions, CVT, etc. But the most entertaining is using an aircraft type jet engine driving a power turbine through a single speed gearbox. Difficult to get it through the noise regs though

Answer 4

Depends whether is manual or auto , on the manual gearbox , first you have the flywheel which is attach to the crankshaft of your engine that drives through the clutch which is engaged and disengaged by your clutch pedal , the clutch drives a first motion shaft , which then drives either the lay-shaft or the main shaft when it drives the main shaft its a direct drive so you would be in top gear when it drive the lay-shaft there are a series of different size gears each larger than the other which mesh with gears on the main shaft , depending which gear you select with the gear lever. At the top inside your gearbox there are three shafts with selectors , they slide a gear along until it engages another gear
depending on the size of the gear is how fast the main shaft is driven . IE first gear the main shaft is only turning at about one turn for every four turns of your engine second gear three turns of your engine third gear two turns of your engine ext , this is only a rough guide the ratio is determined by weight of your car and brake horse power of your car

Answer 5

engine has pistons. sparkplugs and gas create mini explosions causing the pistons to go up and down. pistons are connected to the crank shaft that now spins due to the pistons going up and down. crack shaft is connected to the fly wheel on back of engine. transmission links up here and with oil pressure takes the engine motion and makes the axels move.

if you look past all the electronics, bells, whistles, etc.....cars are a simple machine.

Answer 6

the same way a pushbike has gears and the chain changes to different cog sizes

Answer 7

Have a look at http://auto.howstuffworks.com/transmission.htm

If you follow the various links from there, you will get answers for all your questions.