Patent 11187300 was granted and assigned to Nabtesco Corporation on November, 2021 by the United States Patent and Trademark Office.
A speed reducer according to one embodiment of the invention includes a carrier having a recess therein, a crankshaft disposed in the recess, and a stopper that is disposed on a bottom surface of the recess and prevents the crankshaft from moving in a direction along a rotation axis of the crankshaft toward the bottom surface.