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The automotive universal joint, also known as a cross joint, is a mechanism used to alter the direction of the drive shaft axis. It is commonly found in automobile drivetrain systems. The universal joint consists of active and passive components, along with the cross-shaped joint, allowing the driveshaft to rotate in any direction.

The automotive bushing, also known as a shaft sleeve or bearing sleeve, primarily serves to reduce friction and wear during shaft movement. These sliding bearings are commonly used in automotive components to separate two metal parts, preventing direct collision, friction damage, or noise generation. Bushings are more cost-effective than rolling bearings, although they do exhibit higher friction resistance, which is why they are typically used in specific components.

The mainshaft of a gearbox (or transmission) is a crucial component that operates on the principles of a gear system. It facilitates the transfer of power from the engine to the transmission while allowing for speed adjustments and control over the output horsepower. This mainshaft typically consists of gears and shafts, responsible for rotation and power transmission, with configurations and operations varying based on different gearbox types and application requirements. This working principle makes the mainshaft of a gearbox an integral component in various mechanical systems, spanning from automotive transmissions to industrial machinery, ships, and numerous other mechanical systems.