US Patent 9897192 Lubricating structure for speed reducer

A lubricating structure for a speed reducer includes: a case; a first reduction gear pair provided inside the case; a second reduction gear pair provided inside the case; a first catch tank arranged inside the case; a second catch tank arranged inside the case; a partition member that includes a partition wall that partitions an inside of the case into a first accommodation space in which the first reduction gear pair is accommodated and a second accommodation space in which the second reduction gear pair is accommodated; a first oil passage communicating with the first accommodation space and configured to guide lubricating oil to the first catch tank; a second oil passage communicating with the second accommodation space and configured to guide lubricating oil to the second catch tank; and a communication port provided in the partition member and communicating the first oil passage with the second oil passage.