Item 0955
DESIGN: SynchroLite ~ Power Train -
Reduction - Primary - Belt Drive - 3VX GripnotchOverview:
The following calculations are for Assembly
1316
3VX Gripnotch w/ 4 Grooves by Morse:
Input;
Maximum hp is 67.
Maximum rpm is 4000.
Reduction 2.2:1
Design selection using 3VX Gripnotch belt Drive
(Calculations from Morse catalog. p. G5)
1/ 3VX [This is the belt size that the Helicycle is using, with approximately 70 hp. His small sheave is 5" PD +/- and it has 5 groves]
2/ Design horsepower:
Overload service factor of 1.0.
Design HP = 67 * 1.0 = 67
3/ Drive ratio:
d = 4.95" diameter
D = 10.55" diameter
10.55 / 4.95 = 2.13:1
4/ 4000 rpm
5/ 4.95" diameter at 4000 rpm is about 11.75 hp
6/ 67 / 11.75 = 5.7 sheaves
7/ Length of belt:
L = 2C + 1.57 (D + d) + ((D-d)^2/4C))
L = 2*14.19 + 1.57 (10.55+4.95) + ((10.55-4.95)^2 / 4*14.19)
L = 28.38 + 24.35 + 31.36/56.76
L = 53.28"
8/ A/ 11.75 hp + .57 hp = 12.32 hp
B/ 12.32 hp * .97 = 11.95 hp.
C/ Loss in Arc of Contact
= (D - d) * 57 / C = 22.49
= ((10.55 - 4.95) * 57) / 14.19 = 22.49º
Correction Factor = .96
11.95 * .96 = 11.47 hp.
11.47 hp * 5 grooves = 57.36 hp. ~ Service Factor of 0.86 (Note: the Gates Super HC belts may have a better rating then the Morse 3VX Gripnotch) (There is also the Optibelt 3VX belts)
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The width of the sheave for 5 grooves is 2.31". Ref Morse catalog page G8.
The use of the V-belts for soft-start may be considered somewhat detrimental to belt life, but Robinson and Helicycle do it.
Note;
Could increase the diameter of both sheaves by 30%, if the center to center distance is great enough, and decrease the width by going from 5 belts to 4 belts.
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Last Revised: May 31, 2008