Patent ID: 9115790
Filing Date: 2015-08-25
Classification: A63B,F16H

Abstract:
1. An electric cart comprising: a main body; wheels arranged at the bottom of the main body; and a gear motor arranged to electrically drive at least one of the wheels, the gear motor comprising: a motor having a motor shaft; an output shaft directly or indirectly connected to said at least one wheel; and a gear reduction unit connecting the motor shaft to the output shaft, wherein the gear reduction unit comprises a helical gear train, wherein the gear reduction unit further comprises two bearings that are seated in only one bearing holder to rotatably support the output shaft, the two bearings directly face and adjacent to each other, wherein the helical gear train is a planetary gear train comprising, a sun gear with helical gear teeth, a ring gear surrounding the sun gear and having helical inner teeth, and planetary gears rotatably supported by a carrier; the planetary gears are meshed between the helical teeth of the sun gear and the helical inner teeth of the ring gear, and wherein the gear reduction unit comprises a first stage planetary gear and a second stage planetary gear and wherein the first stage planetary gear is a helical gear train and the second stage planetary gear is a spur gear train.