Patent ID: 8336307

Claim:
A high torque output drive system comprising: a fluid tank including an upper region, a lower region which is disposed opposite to said upper region in an upright direction, and which serves as a reservoir for storing a fluid, and a sub-chamber interposed between said upper and lower regions, and including left and right columnar regions which are opposite to, and are in non-communication with each other in a first transverse direction relative to the upright direction, and which are configured to be in fluid communication with said reservoir respectively, said left and right columnar regions being configured to define left and right running routes, respectively; a looped chain unit including an array of weighted members disposed one after another in series in a lengthwise direction, said array of weighted members having leading and trailing subarrays that are displaced from each other in the lengthwise direction; upper and lower direction reversing guide units disposed respectively in said upper and lower regions, and respectively defining upper and lower guide routes each of which interconnects said left and right running routes, and each of which has entry and exit ends, said upper and lower direction reversing guide units being configured such that, once said looped chain unit is carried forward by said upper and lower direction reversing guide units to move along said upper and lower guide routes, said leading and trailing subarrays are respectively placed along said left and right running routes; a fluid pump operable to move the fluid in said reservoir towards said right columnar region such that a fluid level in said right columnar region is higher than that in said left columnar region and such that a buoyant force is generated in said right columnar region as a result of a difference in fluid level between said left and right columnar regions to lessen weight of said trailing subarray disposed along said right running route so as to render said leading subarray heavier than said trailing subarray, thereby inducing synchronized downward and upward movements of said leading and trailing subarrays; a force-output shaft rotatably mounted on said fluid tank about a revolving axis oriented in a second direction transverse to both the first transverse direction and the upright direction; and a gear train unit configured to couple one of said leading and trailing subarrays to said force-output shaft such that a translational force of one of the downward movement of said leading subarray and the upward movement of said trailing subarray is taken up at a corresponding one of said right and left running routes to drive said force-output shaft to revolve about the revolving axis.