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Reduction Gears  
User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Posted (13 years 5 months 1 week 1 day 1 hour ago) and read 744 times:

What do they do?

3 replies: All unread, jump to last
 
User currently offlineLatechpilot From United States of America, joined Jun 2005, 0 posts, RR: 0
Reply 1, posted (13 years 5 months 1 week 1 day 1 hour ago) and read 730 times:

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.

User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 4
Reply 2, posted (13 years 5 months 1 week 1 day 1 hour ago) and read 728 times:

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?

User currently offlineLatechpilot From United States of America, joined Jun 2005, 0 posts, RR: 0
Reply 3, posted (13 years 5 months 1 week 21 hours ago) and read 716 times:

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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