exercise (machine construction)

[Martakynghi]

hello to all I am beginning to study construction of machines and I would like to ask you since I am not understanding how I understand if the pair of wind turbines is conical or cylindrical. For example, in this figure of this r11' and r22' gearbox are all two cylindrical wheels?
the text tells me that it is a gearbox for coaxial shafts with all wheels toothed to helical teeth

 

[simone1996]

cylindrical dense wheels transmit the motion between parallel axles.
the conical wheels transmit the motion between orthogonal axles.

 

[Stan9411]

If the text tells you that they are helical, it means that they are helical ... between the input data there will also be the angle of inclination of the helix (often called alpha and typically of the value of 20 degrees). from the design you cannot understand. that only serves to define the layout of the transmission. the characteristics of the wheels will be tabulated or indicated in a detail design.

 

[Stan9411]

Sorry, I dwelt on your last sentence, but your doubt is about what has shown you simon. What I wrote is still valid.

 

[meccanicamg]

the fundamental thing is that it must be written because often those who make schematic drawings are not attentive to the particularity that I go to explain.
a straight tooth cylindrical gear is represented as your pattern with the horizontal row in the head of the ingrain diameter.
if it is helical with right or left helix adds a bar on the rotation axis:

 

[simone1996]

if you can help: https://www.skf.com/binary/77-460644/elementi_meccanica_0611_bassa.pdf