| 摘要 |
PURPOSE:To lessen abrasion by specifying a pressure angle of an internal gear with an external gear. CONSTITUTION:An electric pivotal gear device A comprises a speed change internal gear G1 fixed to an input shaft 1 with eccentricity and a speed change external gear G2 having an axis different from the gear. Both of these gears G1, G2 are formed by involute tooth, and a pressure angle is set at 30-45 deg.. The heights (h) of addenda of both gears are set as follows: m/2>h>0 (m: module), and the pressure angle is set in such a manner as to satisfy the following expression: theta2=[(360 deg./Z)X1/z]+theta1, wherein theta1 is a pressure angle of the external gear G2, and theta2 is a pressure angle of the internal gear G1.
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