Planet-gear speed reducer, has two internal rings providing around sections of carrier, rollers and cage for positioning rollers between internal ring and two smooth strips, respectively and bearing locating between sun gear set and shell

摘要

The reducer has two annular smooth strips (111, 112) formed on an internal side. A planet gear set (2) includes a carrier (20) rotationally located within a shell (10) and planet gears (25) carried on the carrier. A sun gear set (3) is engaged with the planet gears. Two semi-bearings (11, 12) include two internal rings provided around sections of the carrier, rollers and a cage for positioning the rollers between the internal ring and the two smooth strips, respectively. A bearing (13) is located between the sun gear set and the shell.