A handbook on the teeth of gears, their curves, properties, and practical construction (1890)
Grant, George B. (George Barnard), 1849-1917 · Lexington, Mass., Lexington Gear Works · leaf 53
If the height of the cycloid is greater thanthe diameter of the pinion, Fig. 35, the flank isa lobe, entirely external to the pitch line; andalthough the contact is still mathematicallyperfect, it is no longer practicable, for it ison the inside of the cycloid, as shown at P\ … Cycloidal Involute If the proportion is carried to its extreme,the height being infinite as compared withthe diameter of the pinion, as in Fig. 36, the THE NORMAL THEORY OF THE GEAR TOOTH CURVE. cycloid becomes the straight line OD, and thepinion flank is the involute OD. From this itis plain that…
Gearing
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