Actual Problems in Machine Building 2016 No. 3

Actual Problems in Machine Building. 2016. N 3 Technological Equipment, Machining Attachments and Instruments ____________________________________________________________________ 258 EQUATIONS OF PROFILE TOOTHING WITH ROUNDED EDGES FOR A WAVE GEAR WITH INTERMEDIATE ROLLING SOLIDS Korotkov V.S., Ph.D. (Engineering), Associate Professor, e-mail: kvs@tpu.ru Lao Guanqing , Master’s Degree student, e-mail: taixuyiqing@mail.ru National Research Tomsk Polytechnic University, 30 Lenina Avenue, Tomsk, 634050, Russian Federation Abstract The geometric parameters of the toothing of the wave gear with intermediate rolling solids is considered. A coordinate system is selected. The parametric equations of the profile of the rim are derived. In order to improve transmission efficiency and to reduce its running-in period the equations for the rounded edges of toothing are deduced. The coordinates of the center of the rounding circle are found. The recommendation for the selection of the diameter of the rounding circle is given. Epicycloidal profile with rounded edges by AutoCad program is drawn. The sample model of the ring gear on the basis of the mathematical relationships is made. The product is intended for use in the construction of the power tool electric drill on the basis of the commutator motor with a useful capacity of 1 kW. Keywords electric drill, commutator motor, wave gear, intermediate rolling solids, toothing, rounded edges, wear debris, epicycloid, rounding circle, parametric equations