With the present interest in energy saving, the improvement
of gear efficiency is being looked at again. In this paper, differences
between Buckingham's and Merritt's gear efficiency equations are described.
These equations are of the same calculation form, but the manner in which
they are used differs. The equations are valid under the assumption that
input energy is calculated as the product of the normal force and displacement
along the line of action. The author clarifies that an incorrect manner
of calculating input power in the meshing gear may lead to trouble, and
that Buckingham's and Merritt's equations are approximations. Moreover,
in this paper a problem derived from the treatment of pitch point force
is described. From the results of this study, it is concluded that the
use of a tangential force of the pitch circle leads to an incorrect theory.
The author deals with the locking phenomenon of the planetary gear mechanism
as an example.
Contents
1.Introduction
2. Buckingham's
and Merritt's Equations