Diagram of the difference between inner and outer cages

    Difference: The inner ball cage is connected to the differential of the transmission, while the outer ball cage is connected to the wheel. The outer ball cage plays a role in both power output and vehicle turning.

The ball cage, also known as the constant velocity universal joint, is an important component in the transmission system of a car. Its function is to transfer the power of the engine from the transmission to the two front wheels, driving the car at high speeds.

    Extended Information:

    A cage, also known as a constant velocity universal joint, is an important component in a car's transmission system. Its function is to transfer engine power from the transmission to the drive wheels, driving the car at high speeds.

    There are many types of constant velocity universal joints used in cars, among which the most commonly used are ball cage constant velocity universal joints and triangular frame constant velocity universal joints. They mainly consist of sliding sleeves, three-way shafts, transmission shafts, star shaped sleeves, retainers, and bell shaped shells. Due to the heavy driving torque transmitted by the constant velocity universal joint, which is subjected to heavy loads, has high transmission accuracy and high demand, and is also a safety component, its main parts are all processed by precision forging.

    Outer ball cage: The steel balls of this type of cage are fixed and placed in six windows of a cage between the star sleeve and the bell shell. The steel balls have exactly half of their positions in the star sleeve and the bell shell, and the angle of action with the universal joint is determined at once. The smooth surface treatment makes the motion of the universal joint like a helical gear. The six steel balls push the ball paths in their respective star sleeves and bell shells, but transmit torque through the steel balls rather than the teeth of the gears.