what is the limit beyond which i have to predict lubrication of gears?

[9simo0]

Hello everyone,

I have a problem that I can't find an answer. I have a motor of 150 cc to two cylinders, two times with a nominal power of 18cv that turns to a number of turns of 7500 rpm. I have to take the number of laps around 921 rpm. the first stage of reduction I thought to make it belt (for vibration reasons) with a ratio of 1:2, thus reaching a number of laps of approximately 3750 rpm. then having to transmit the bike to an orthogonal tree to mine I thought well to use a couple of conical gears. at this point I find myself with a couple always of about 18 cv and a number of turns of 3750. using a pinion with 16 teeth and a wheel with 60 teeth and a 2.5 module, I find an effort on the tooth (route conducted) of about 1500 mpa! I was going to use a plastic gear...:frown: at this point I have to force to use a steel gear!!! But... is lubrication necessary? ?

precise... I could have used a larger module etc. etc. But I must remain content both as spaces but especially as weights!!! :frown:
so if I increase the module decreases my effort but I increase the size of the wheel!!! =((I mean to me it would be good to have also two steel wheels with teeth and module that I said before but nn would be good to add a lubrication carter :frown:

otherwise I was thinking about any other solution. . .

every advice is accepted! ! !

thanks for the attention :smile:

 

[MBT]

... cut
at this point I find myself with a couple always of about 18 cv and a number of turns of 3750. ...
thanks for the attention :smile:

I hope you meant a power of 18 cv!!!!

Anyway, I would say that with that number of laps and that power to transmit... You have very little hope!

 

[MBT]

I integrate the previously written answer
I remember, since the days gone, that the crawling speeds and the specific pressure have very precise limits if you want to stay in the field of the "non-lubricated".
as you can well guess by observing motors, these limits are quite low
in fact any motorcycle or automotive gearbox, but also the most trivial of motors is lubricated. Maybe at a glance, but there must be.

I remember that in my old textbooks there were indications about it. .
I'll see if I can recover them.

 

[9simo0]

Yes I pardoned writing couple at some point but actually I meant power! eheheh :smile: sorry but all day with these damn data!!! I am fused eheh cmq thank you for the interest! :smile: if you can find me that data I would be very grateful.:smile:

 

[zeigs]

1500 mpa where is he? as contact pressure or material? In the second case, steel is not good either. .

 

[sampom]

But... is lubrication necessary? ?

I would say yes!

and the limit is very but very low.

greetings
Marco:smile:

 

[9simo0]

I find them in the material! even if I have considered too high coefs in my opinion...you realize that the actual pressure is less than a quarter! cmq we sn some types of steel that hold those pressures...but I realize I have asked a stupid question...the lubrication takes us here!:frown:

 

[zeigs]

I don't want to lose as much as you can cost

 

[9simo0]

eheheh the cost is not a problem...eheheh the important is the weight and the encumbrance :biggrin:

 

[luigi.paiano]

my god:d...cmq lubrication is essential especially to these loads. but with that speed I have no idea how to do it!

 

[9simo0]

What do you mean at that speed? cmq I have provided a lubrication system :smile: now it should be ok! thanks to all :biggrin: