Gear mesh frequencies
Gear mesh frequencies
(OP)
This is my first question and I apologize if I'm going about this the wrong way. My problem is identifying gear mesh frequencies in a planatary drive. Nothing lines up in my spectrum. Sun Pinion 18t mating with 3 planatary gears with 28t mating with a 75 tooth ring gear. What are the frequencies assumming the sun pinion is rotating at 98 rpm. I am not able to open the drive up to get an actual count. All counts were given by the manufacturer.
please break this down as simple as possible so I may understand what I'm doing wrong or is the count wrong.
Thanks,
8ptbuck
please break this down as simple as possible so I may understand what I'm doing wrong or is the count wrong.
Thanks,
8ptbuck





RE: Gear mesh frequencies
Sun rotational 1.633Hz
Output shaft speed 0.316Hz
Gear tooth contact 29.399Hz
Planet Gear rotational 1.0499Hz
RE: Gear mesh frequencies
If you give the arrangment I will send you the formulas for doing the calcs.
Regards -:)
Ron Frend
tel: 011 44 1253 400541
ron.frend@predicon.net
http://www.predicon.net
RE: Gear mesh frequencies
HELP!!!
RE: Gear mesh frequencies
RE: Gear mesh frequencies
The fan wouldn't happen to have 3 blades, would it?
RE: Gear mesh frequencies
Your gearbox seem to be planet factoring, where the ringear 75t, and the sungear 18t are divisible with the number of planets 3. In theory this should give a cyclic beat, and slightly higher noise levels, as the same type of mesh occurs on the 3 planets mesh simultaneously with the ring and sungears. (Assuming some slight errors in the teeth)
The beat on the ringear should be 0.948Hz (the smaller one)
And a beat on the sungear of about 4.9Hz which should be bigger since it is coherent with the ringear beat
You have also used an even number of teeth in the planet gears, which has about the same effect.
The most important question to as is whether your gears are floated to move radially. This is extremely important to cancel out manufacting errors, and provide much better load sharing between the planets.
Regards....
RE: Gear mesh frequencies
The Gear Analysis Handbook
By James I. Taylor
RE: Gear mesh frequencies