The multi-point meshing internal and external gear reducer includes a center input shaft, an driving gear, a driven gear, an output internal gear, a center output shaft, an input end casing, an output end casing, a driving gear fixed to the center input shaft, a center input shaft fixed to the input end casing through bearings, a driven gear also fixed to the input end casing through gear shafts and bearings, and an output internal gear fixed to the center output shaft, The central output shaft is fixed on the output end casing through bearings, characterized by at least two or more driven gears symmetrically distributed along the circumference of the driving gear meshing with the driving gear, and the teeth on the other side of the driven gear meshing internally with the output internal gear at the output shaft end, outputting torque.

The gear reducer includes a gearbox casing and a gear reducer arranged inside the gearbox casing. The gearbox casing includes a casing body and an inner core layer, with the inner core layer arranged on the inner wall of the casing body. This gear reducer is equipped with an inner core layer on the inner wall of the reducer casing, and this inner core layer is made of stainless steel material, which can avoid rust, pitting, and damage to the inner surface of the reducer casing, thereby ensuring the normal operation of the transmission device inside the reducer and extending its service life.