dimensioning toothed wheels to helical teeth

[meccanicamg]

sisi lo sò, was right to have a correlation between the two results

if you have to do static verification in the most stressed section you will use:[math]\sigma_{adm}}frac{rsspelk_s*k_d}[/math]where ks will be the static safety coefficient that could be very well 1.5....2 and the kd coefficient will be the dynamic safety coefficient that could be worth for medium/free condition even 2...3...5.
and you will compare it with the tension of von mises of the section with all actions agents.

Remember that if the exercise does not ask for the explicit application of dynamic conditions, fatigue and anything else, academically it refers only to ks that is taken 1.5 standard and at times 2 so to have a little more margin (but it is not so much)....practically what you have seen in lesson or textbook.

 

[meccanicamg]

I was looking at module 6, since I only remembered now that you did so, you will have a little bit lower reactions than a 30% so you can still reduce the dynamic coefficient a bit.
Unfortunately there is no linear correlation between coefficients and load, therefore, as reported in motion sources, it is essential to collect the company experience of the product that is being studied, because coefficients can be little or so depending on the context.

 

[Raffaele98]

if you have to do static verification in the most stressed section you will use:[math]\sigma_{adm}}frac{rsspelk_s*k_d}[/math]where ks will be the static safety coefficient that could be very well 1.5....2 and the kd coefficient will be the dynamic safety coefficient that could be worth for medium/free condition even 2...3...5.
and you will compare it with the tension of von mises of the section with all actions agents.

Remember that if the exercise does not ask for the explicit application of dynamic conditions, fatigue and anything else, academically it refers only to ks that is taken 1.5 standard and at times 2 so to have a little more margin (but it is not so much)....practically what you have seen in lesson or textbook.

In fact we normally use 2 without kd, but if size using von mises comes out a minimum diameter of 27 and it seems strange to me, as if dimension only torsion using your formula comes out 40. I'm not convinced of this.

 

[meccanicamg]

In fact we normally use 2 without kd, but if size using von mises comes out a minimum diameter of 27 and it seems strange to me, as if dimension only torsion using your formula comes out 40. I'm not convinced of this.

It is not strange is simply very constituent because it does not consider anything that is the actual stresses of operation. It's academic and incomplete.

 

[Calender]

Good morning to all, very interesting discussion. . .the optimization of the power density of the gearboxes is an argument that is not found very effectively around.

to what expressed brilliantly in previous posts I add that it is possible to further optimization of the volumes increasing the number of ramifications of the reducer (as in case c in image to understand us). I obviously refer to the total volume of the reducer.
In this way, it is usually possible to further compact costs (direct experience). However, I have also found feedback in recent studies. of which I bring a very interesting article:

https://www.geartechnology.com/issues/1111x/kapelevich.pdf

 

[meccanicamg]

Good morning to all, very interesting discussion. . .the optimization of the power density of the gearboxes is an argument that is not found very effectively around.

to what expressed brilliantly in previous posts I add that it is possible to further optimization of the volumes increasing the number of ramifications of the reducer (as in case c in image to understand us). I obviously refer to the total volume of the reducer.
View attachment 64149In this way, it is usually possible to further compact costs (direct experience). However, I have also found feedback in recent studies. of which I bring a very interesting article:

https://www.geartechnology.com/issues/1111x/kapelevich.pdf

we will cofner the practice of this use of mating and intermediate stages. In fact, everything is compact, on the teeth, however, act actions of multi contact so wear is accentuated. in certain situations can work very well, with important couples.

 

[meccanicamg]

with some clarity, I took over the counterntobtra i and u.
I have read the niemann and carefully observed the chart of the breakdown of the reduction reports.
in formulas we talk about i=u i.e. reduction ratio, then of values greater than one for speed reducers.
formulas give the results obtained in Fig. 22.1/1.
so when in the previous post I said that it was necessary to use 1/i i.e. transmission ratio i.e. less than one is wrong.