Spider gears, also known as planetary gears, are essential components in automotive differentials that enable torque distribution and wheel speed differentiation during turns.
Spider gears are a set of small bevel gears mounted on a central spider or cross-pin within a differential assembly. They function as planetary gears that rotate around the sun gears (side gears) connected to the axle shafts. This configuration allows the left and right wheels to rotate at different speeds while maintaining torque distribution, crucial for vehicle stability during cornering and on uneven surfaces.
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Spider gears enable the left and right wheels to rotate at different speeds during turns while maintaining equal torque distribution, preventing wheel hop and ensuring smooth cornering.
Most passenger vehicle differentials contain either 2 or 4 spider gears mounted on a cross-pin, depending on the differential design and load requirements.
Failed spider gears can cause binding, noise (whining or grinding), loss of torque to one wheel, or complete differential lockup, potentially leading to drivability issues or vehicle immobilization.
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