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1 International Journal of Applied Mechanics and Engineering

1 2002

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A contribution to the optimal choice of the HCR-gears regarding frictional losses

Krizan B., Basan R., Lovrin N.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

249-254

High transverse contact ratio (HCR) gears are non-standard involute gears with a transverse contact ratio ea>2 which proved adequate for use in automobiles, trucks, aircrafts and ships. The paper deals with the dependence of the sliding friction losses on HCR spur gears geometry such as pressure angle, tooth height, gears centre distance resp. addendum modification coefficients sum, addendum modification coefficients sum distribution and other parameters. The calculations are based on the comparison between the values of the sliding friction loss geometrical factor, which comprises the influence of the magnitude, and form of the toothing. A proper choice of these parameters is necessary for achieving good gearbox efficiency. The calculations results are shown in diagrams which can be a tribological guideline to a designer in choosing gears optimal geometrical parameters.