Planetary gear efficiency
Planetary gear efficiency
(OP)
I'm looking at a planetary gear transmission (no it ain't on a car), and I would like to know what would be a reasonable figure for its efficiency. I have found in one reference that a spur gear can be counted upon to have 98% efficiency. With that in mind, will 98%N work (where N is the number of stages)?
Seems I get a rather small result if I do so.
Also, can I count on bevel gears to be as efficient at transmitting power as straight spur gears? My reference books don't give that information, either.
Any references would be helpful. Thanks.
Seems I get a rather small result if I do so.
Also, can I count on bevel gears to be as efficient at transmitting power as straight spur gears? My reference books don't give that information, either.
Any references would be helpful. Thanks.
Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout





RE: Planetary gear efficiency
RE: Planetary gear efficiency
Are you designing this gear train, or ordering something from a catalogue?
Dudley's Gear Handbook, Dennis P. Townsend, McGraw Hill has a whole section on Gears in Action. This covers efficiency of all sorts of gears, including bevel and hypoids. It covers planetary drives.
I haven't read the section carefully or applied any of it, so you are on your own. Probably, the book is on Amazon.
JHG
RE: Planetary gear efficiency
Cheers
Greg Locock
RE: Planetary gear efficiency
I'm doing some reverse-engineering, actually, so the configuration is quite fixed. This is the transmission on a Bell helicopter. The 1350hp engine drive is output horizontally to a bevel gear driving the planetary reduction gear which in turn drives the mast.
Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout
RE: Planetary gear efficiency
Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout
RE: Planetary gear efficiency
TTFN