Abstract: A knuckle arm includes a body having a bearing hole. A first connection plate extends from a rear end of one of two sides thereof so as to be connected with a brake pump. Two protrusions extend from a front end of the body, and two second connection plates are connected to the two protrusions such that a pull rod is removably connected to either of the two second connection plates. Two connection boards extend from two ends of the front end of the body, with each connection board having a hole for receiving joints of the upper and lower control arms. The knuckle arm can be used for right and left wheels, and the length of the pull rod can be optionally connected thereto.

Abstract: A differential mechanism includes a casing having two opposite ends each having a cover longitudinally mounted thereon. A rotator assembly is mounted in the casing and has a seat received in the casing. A shaft is diametrically mounted in the seat. Two differential gears are respectively rotatably mounted to two opposite ends of the shaft and are respectively engaged to a corresponding one of two drive gears that are respectively securely sleeved on a first drive axle and a second drive axle. An input coupling and an output coupling are respectively longitudinally mounted to the two opposite ends of the seat for centrally mounting the first drive axle and the second drive axle to two opposite ends of the seat. The input coupling is engaged to a transfer element.

Abstract: A differential mechanism includes a casing having two opposite ends each having a cover longitudinally mounted thereon. A rotator assembly is mounted in the casing and has a seat received in the casing. A shaft is diametrically mounted in the seat, and two differential gears are respectively rotatably mounted to two opposite ends of the shaft and respectively engaged to a corresponding one of two drive gears that are respectively securely sleeved on a first drive axle and a second drive axle. An input coupling and an output coupling are respectively longitudinally mounted to the two opposite ends of the seat for centrally mounting the first drive axle and the second drive axle to two opposite ends of the seat. The input coupling is engaged to a transfer element.