Patent ID: 8348813

Claim:
A treadmill comprising: a base, having a front roller and a rear roller installed respectively at the front end and the rear end of the base, and; a treadmill belt disposed around the front roller and the rear roller, one of the front and rear rollers comprising: a motor, wherein the motor is an out-runner motor having a spindle and a power output section, wherein the power output section rotates around the spindle; a gear set rotatably installed onto the spindle, wherein the power output section is engaged to the gear set; and a case, wherein the gear set is engaged to the case, causing the case to rotate about the spindle; wherein the case is externally installed in fixation with an accommodation section and an inner gear ring, in which the inner gear ring is fixedly installed onto the inner wall of the accommodation section, the motor and the gear set are placed in the accommodation section, the gear set engages with the inner gear ring and the accommodation section brings the case to rotate relatively to the spindle; wherein the case is externally installed with another motor, in which the motor and the installed another motor are respectively placed at the two ends of the case.