pressure angle

[dunner]

Hello, I pray that I have just arrived, I am a student of the faculty of mechanical ing and I am studying the dense wheels. from reading books I can't see if two gear wheels are enough to have the same module or if it's important that they have the same pressure angle as well. If the second answer is right, why is this corner so important that we speak so little? thank you so much in advance!

 

[Pastorman75]

First of all, I think you're talking about "evolving" wheels.

for such conjugated profiles (the evolving circumference precisely), the pressure angle determines (together with other geometrical sizes such as the primitive diameter) which portion of the curve used to generate the tooth that uses only a small portion of the entire generator profile.

to make sure that the dense wheels "wheel" in the contact point without crawling, such angle must necessarily be the same. If so, you would have an undesirable streak between the two profiles while obtaining wheels that, if with equal step, could transmit the bike (lessly efficient though).

of this corner we speak a lot in literature, just look good!

Hi.

 

[gerod]

Welcome!
from my remembrances of the machine construction course we talked a lot about this corner.
I don't think they're forgotten because, as pastorman says, that corner is fundamental as well as the module that must be the same (eye that the two are conditions not only "bright" but necessary and sufficient!! ! )
Hi.

 

[dunner]

thanks for having responded you are very kind, the book recommended by the prof is: "construction of machines vol 2" author johns, the last edition (the fifth) dates back to 1980 and is still written by machine, of the pressure angle it speaks but not well dwells rather on the optimal values of the corner and provides tables to find, known the transmission ratio, the minimum number of teeth of the wheel. I looked a bit on the internet but I can't find more in detail. Could you please give me some more detailed information on the corner? or do you have sites that talk more about it? Thanks again.

 

[sampom]

thanks for having responded you are very kind, the book recommended by the prof is: "construction of machines vol 2" author johns, the last edition (the fifth) dates back to 1980 and is still written by machine, of the pressure angle it speaks but not well dwells rather on the optimal values of the corner and provides tables to find, known the transmission ratio, the minimum number of teeth of the wheel. I looked a bit on the internet but I can't find more in detail. Could you please give me some more detailed information on the corner? or do you have sites that talk more about it? Thanks again.

Meanwhile, look at some "night":View attachment 12846-INTRODUZIONE ALLE RUOTE DENTATE.pdfI've got something else at home. I'll get you in the evening.

greetings
Mar

 

[dunner]

thanks marco, that page I already read it, gives the definition of pressure angle and just, does not explain to what it serves and why it is important for the purpose of correct ingration. Thank you very much for your availability, I expect your news. I'm sorry I haven't introduced myself yet, my name is Franciscan.

 

[Fulvio Romano]

We do not neglect the fact that the pressure angle is the only one since it allows you to dimensional your teeth by knowing peripheral speed and power to transfer.