Abstract: A nutational cycloidal reducer reduces an input speed to an output speed by a reduction ratio. The reducer includes a timing ring having an internal wall with a series of longitudinally extending tooth profiles, an output connected to the timing ring, a pulley having a central opening, a series of longitudinally extending tooth profiles and a plurality of circumferentially disposed pin bores. An input shaft has first and second shaft portions. The first portion is concentric with a longitudinal axis and the second portion is eccentric to the axis. A plate has a central opening. The pulley is positioned in the timing ring with some of the pulley and timing ring tooth profiles engaged with each other. The second shaft portion is positioned in the pulley and the plate and drives the pulley in a nutational movement.

Abstract: A nutational cycloidal reducer reduces an input speed to an output speed by a reduction ratio. The reducer includes a timing ring having an internal wall with a series of longitudinally extending tooth profiles, an output connected to the timing ring, a pulley having a central opening, a series of longitudinally extending tooth profiles and a plurality of circumferentially disposed pin bores. An input shaft has first and second shaft portions. The first portion is concentric with a longitudinal axis and the second portion is eccentric to the axis. A plate has a central opening. The pulley is positioned in the timing ring with some of the pulley and timing ring tooth profiles engaged with each other. The second shaft portion is positioned in the pulley and the plate and drives the pulley in a nutational movement.

Abstract: Modular gearbox assemblies, modular gearbox kits, and methods for assembling and for using a modular gearbox assembly are disclosed. A modular gearbox assembly is disclosed which includes one or more gear modules each comprising a gear train encased by a module housing. The gear train includes intermeshed gear elements that provide a predetermined gear ratio. The module housing has one or more coupling elements projecting radially outward therefrom. A gearbox housing stows therein the gear module(s). The gearbox housing has an input coupler for attaching to a driving mechanism and transmitting power output therefrom to the gear module(s). The gearbox housing also has an output coupler for attaching to a driven mechanism and transmitting thereto modified power output from the gear module(s). The gearbox housing has one or more protrusions projecting radially inward therefrom that mate with the coupling element(s) to thereby attach the gearbox housing to the gear module(s).