1) Clearance: the different between the dedendum and the addendum.

2) Because of the tooth thickness of the dedendum is larger than that of the common involute gear and the Pitchs do not contact each other, the beam strength and surface strength of tooth are increased.

3) In order to avoid the "midconvex" of tooth profile and the serious abrasion in dedendum , the technology of center distance variation was adopted.

4) Gear shape is calculated and interference of planetary gear dedendum and internal gear addendum is avoided.

5) Especially the accurate modeling of the transition curve of dedendum, which ensures the accuracy of bending fatigue strength of the tooth root by the finite element analysis.

6) We have made certain that the reason of the splined spindle rapture is fatigue failure, its crack initiation lies in the minimal knuckle curvature radius surface region of the spline dedendum bottom.

7) This paper designs a measuring instrument which can measure addendum circle and dedendum circle diameter of odd-tooth gears and can define all main parameters of gears .

8) This article discusses the effects of friction coefficient fon the engagement efficiency of involute cylindrical gears and the bending stress of the dedendum.

9) The tooth shape deviation in the worn traction gear will increase the vibration of traction gear and traction motor,(http:///dedendum.html) increase the noise and increase by large scale the dedendum stress.

10) The purpose was to gain new knowledge about the magnitude and distribution of the actual stresses occurring in the dedendum .

11) Strength design from considering the tooth surface pressure lubrication condition and dedendum intensity of two aspects.