An automobile tooth gear is a type of gear that is used in an automobile's transmission system. The transmission is responsible for adjusting the output of the engine to match the speed and torque requirements of the wheels as the vehicle moves at different speeds. Each gear in the transmission has a different number of teeth, which determines its gear ratio. The gear ratio is the ratio of the number of teeth on the driven gear (the gear that is receiving power) to the number of teeth on the driving gear (the gear that is transmitting power). This is what changes the output speed and torque of the transmission, thus allowing the vehicle to move at different speeds.

　　Automobile tooth gears are typically made of metal alloys such as steel or aluminum and are designed to handle high loads, and high speeds, and to last for a long time. They must also be made to very precise standards in order to work correctly, and lubrication is also important for prolonging their lifetime and keeping them working efficiently.

　　In summary, tooth gears are mechanical parts found in an automobile's transmission. They have teeth on the circumference, which mesh with others gears to transfer torque and power from the engine to the wheels. The number of teeth on a gear and the gear ratio are important factors that determine the speed and torque at which the vehicle moves.

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