In the design, the aperture of the belt/tooth/chain is determined by the use conditions and structural requirements of the shaft, but sometimes for compact structure, the outer diameter D should be as small as possible and the aperture D should be as large as possible, that is, the thickness of the hub should be as small as possible. The hub mainly bears torque. Is it considered as a hollow cylinder in the design, as long as it meets the torsional strength?
Basic information
The diameter of the pulley can be directly found in the mechanical manual. It is a solid pulley, and its value range is: V-belt D= 1.8~2d, flat belt D=2.3~6d, spoke wheel D 1 (diameter of convex circle) = 1.8-2d. At the same time, the manual also gives the thickness value A between the root circle D and the hole D of the V-belt groove.
The synchronous belt gives the pitch of the root and the pitch of the top. Solid gear: the distance between the bottom of keyway and the root circle of bevel gear is more than 2m (modulus), the root circle between the bottom of keyway and small end face is less than 1.6m, the web a is 2.5 ~ 4m but not less than 8, and d is 1.6 ~ 1.8d3p (G2.