There is no gear with teeth inside or outside, or it is called a ring. The inner teeth are used for internal meshing, and the outer teeth are used for external meshing. Thanks for your help
First of all, to be sure, there are some gears with both internal and external teeth:1. If a gear is fixed on the shaft with an involute spline, the gear will have both internal and external teeth
2, in the transmission of special circumstances, may also have a special gear, both internal and external gear for example, planetary gear drive, a ring gear (also called the internal gear), in the transmission process, if the needs of the entire planetary system to do a whole week to swing, then, can be in a tooth a special ring gear has internal and external gear.
1, this practice early, senior car gear system is a planetary gear series (or planetary gear group) in the form of the time shift, all gears are not engaged in or out of action, but the shift is different with the "brake" to change the speed of the ring gear. Different from your imagination is not outside gear ring gear (or pulley), but different friction ring gear brake.2, your approach is feasible: as follows3, when the solar wheel is braking, the output form is outer gear ring - planetary bracket4, when the outer gear ring for braking, the output form: sun wheel - planetary frame
Both inside and outside the teeth have more gear. Our company also produces these. This output, as you say, has been applied on many machine tools. It is recommended that you refer to the differential output on the gear hobbing machine.
