2006-12-14 09:07:19 · 9 answers · asked by ktrevblan1977 1 in Cars & Transportation ➔ Other - Cars & Transportation
The loads in most cases are extremely heavy and they require very low gearing to get them going. The gearing is also designed to help with long down-hill runs so the driver can save his brakes. They are actually a very critical part of operating a tractor-trailer.
2006-12-14 09:10:59 · answer #1 · answered by Rocko Barbella 4 · 1⤊ 0⤋
An engine hits it's peak power in a certain RPM range, and a large number of gears help keep it there.
2006-12-14 09:10:13 · answer #2 · answered by Anonymous · 1⤊ 1⤋
10, 13, 26. Most 13.
2006-12-14 09:09:05 · answer #3 · answered by Anonymous · 0⤊ 2⤋
To most efficiently match the engine speed to the wheel's/road speed and manage the huge loads and power involved.
2006-12-14 09:11:33 · answer #4 · answered by Anonymous · 1⤊ 0⤋
there is too much weight for the engine to move from stop in, say, 5 gears, they need the huge reduction, just like a bike for fat people
2006-12-14 09:08:59 · answer #5 · answered by Tom C 2 · 2⤊ 1⤋
more for distribution of power and also for torque, up to speed faster and for slowing down easier
2006-12-14 09:11:27 · answer #6 · answered by gregory j 1 · 1⤊ 0⤋
it depends on the transmition usely 9 or 18
2006-12-14 09:08:54 · answer #7 · answered by dirtydeathgutter 3 · 0⤊ 1⤋
for differents loads and terrain
2006-12-14 09:09:07 · answer #8 · answered by links305 5 · 1⤊ 1⤋
torque.......
2006-12-14 09:15:20 · answer #9 · answered by wilsonsubsea 1 · 0⤊ 1⤋