SIMPLE PLANETARY REDUCTION GEAR

摘要

A simple planetary reduction gear (14) is provided with a sun gear (18), a planet gear (34) which revolves around the sun gear (18) and is supported by a carrier (32), and an internal gear (36) with which the planet gear (34) internally meshes, and is used in a vertically installed state. The sun gear (18) has a shaft part (18B) protruding to the load side (lower side) coaxially with the shaft center (O1) of the sun gear (18), and the shaft part (18B) is supported by a ball bearing (74) disposed between the outer periphery of the shaft part (18B) and the inner periphery (32A) of the carrier (32). Consequently, high maintainability is ensured, and the problem of generation of heat is prevented.