Machine element or mechanism – Gearing – Teeth
Patent
1977-06-21
1978-09-12
Gerin, Leonard H.
Machine element or mechanism
Gearing
Teeth
F16H 5506
Patent
active
041127820
ABSTRACT:
This is a compatible gear system and consists of providing an odd number of teeth on each gear, a minimum of five or more. The size and shape of the gear and its teeth are determined by laying out a regular polygon having an odd number of sides, corresponding to the number of desired gear teeth with the distance from the center of the regular polygon equal to the pitch radius of the desired gear. Then a circle is drawn about each polygon corner with a radius equal to one-fourth of the side of the polygon, this series of circles determining the shape and size of the gear teeth. Next, an intermediate series of circles is provided with their centers at the midpoint of the polygon sides and, of necessity, the intermediate circles are tangent to the teeth determining circles. Lines drawn through the points of tangency between each intermediate circle and the adjacent corner circles are necessarily parallel. The outer portions of the corner circles determine the size and shape of the teeth, and the inner portions of the intermediate circles determine the depth of the gear teeth meshing recesses between the teeth.
In addition, slight clearances are provided at the tips of the teeth, the clearances being at right angle to a pitch radius extended therethrough. These clearance edges may be a straight chord in the tooth circle, or may be a rounded edge, and, in either case, permit better lubrication. The gears thus made are greater in strength, durability and much more efficient in transmitting power than conventional gears.
REFERENCES:
patent: 1005464 (1911-10-01), Phelps
patent: 1833159 (1931-11-01), Garnett
Gerin Leonard H.
Miller Gustave
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