A/c train
Topic Author
Posts: 674
Joined: Sun Jun 10, 2001 7:57 am

Reduction Gears

Tue Mar 20, 2001 1:27 am

What do they do?
 
LaTechpilot
Posts: 125
Joined: Sun Jun 19, 2005 3:11 am

RE: Reduction Gears

Tue Mar 20, 2001 1:44 am

Reduction gears are mainly found on turboprop engines. The power turbine spins at over 45,000 RPMs, so it is necessary to slow the process down a bit before you connect a prop shaft to it. The reduction gearbox allows the prop to turn at anywhere from 900 to 1,700 RPMs. It also gives you lots of tourque when gearing from 45,000 RPMs to 1,200. Jet engines use reduction gears to run various accessories, but they are not quite as essential as the turboprop's gear box.
 
A/c train
Topic Author
Posts: 674
Joined: Sun Jun 10, 2001 7:57 am

RE: Reduction Gears

Tue Mar 20, 2001 1:52 am

So they are used to slow down the lets say driving gears speed to be able to get a specific output to a prop for example?
 
LaTechpilot
Posts: 125
Joined: Sun Jun 19, 2005 3:11 am

RE: Reduction Gears

Tue Mar 20, 2001 5:30 am

In your car the tachometer may say that your engine is turning 3,000 RPMs. Your tires may be turning 700 RPMs. That is because there is reduction gearing between your car's engine and the drive shaft. The same holds true for turboprop engines. It would be impossible for a prop to spin 45,000 RPMs, so it is geared down. The further it is geared down, the more torque it is able to produce. I hope this explains it a little better.

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