Roller bearings are widely used in automotive engines, transmissions, steering systems, suspension systems, and other components to support and transmit power. Roller bearing is a type of bearing that can withstand large radial and axial loads. Its structural feature is that there is a certain number of rolling elements (rollers or balls) between the inner and outer rings to support and transmit power. Due to its high load-bearing capacity and low friction coefficient, roller bearings are widely used in automotive engines, transmissions, steering systems, suspension systems, and other components. In automotive engines, roller bearings are mainly used to support the crankshaft and connecting rods, bearing the radial and axial loads of the engine. Due to the high load and high-speed rotation that the engine needs to withstand during operation, the high load-bearing capacity and good wear resistance of roller bearings are very important. In automotive transmissions, roller bearings are used to support gears and bearing seats, withstand the load of the transmission and transmit power. Due to the high torque and high-speed rotation that the transmission needs to withstand during operation, the high load-bearing capacity and low friction coefficient of roller bearings can effectively reduce energy loss and wear. In the automotive steering system, roller bearings are used to support the steering gear and knuckles, withstand the load of the steering system and transmit power. Due to the need for high accuracy and reliability in the steering system, the high stiffness and stability performance of roller bearings can e