The displacement of the helical rack, l, for one rotation of the mating gear is the product To mesh a helical gear to a helical rack, they musthave the same helix angle but with opposite hands. Normal coefficient of profile shift x n = 0. The formulas of a standard helical rack are similar to those of Table 6-6 with only the Similarly, Table 6-7 presentsĮxamples for a helical rack in the radial system (i.e., perpendicular to gear axis). With normal module and normal pressure angle standard values. Table 6-6 presents the calculation examples for a mated helical rack Viewed in the normal direction, the meshing of a helical rack and gear is the same asĪ spur gear and rack.
Table 6-5 presents equations for a Sunderland gear. The only differences from the radial system equations of Table 6-3 are those for addendum and whole depth. The radial pressure angle, α t, and helix angle, β, are specified as 20° and 22.5°, respectively. Table 6-7 6.10.3 Sunderland Double Helical GearĪ representative application of radial system is a double helical gear, or herringbone gear,
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